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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1207.6791 | Alfredo Lopez Ortega | A. Lopez-Ortega | On the quasinormal modes of the de Sitter spacetime | 11 pages, 4 figures | null | 10.1007/s10714-012-1398-4 | null | gr-qc | http://creativecommons.org/licenses/by/3.0/ | Modifying a method by Horowitz and Hubeny for asymptotically anti-de Sitter
black holes, we establish the classical stability of the quasinormal modes of
the de Sitter spacetime. Furthermore using a straightforward method we
calculate the de Sitter quasinormal frequencies of the gravitational
perturbations and discus... | [
{
"created": "Sun, 29 Jul 2012 18:44:18 GMT",
"version": "v1"
}
] | 2015-06-05 | [
[
"Lopez-Ortega",
"A.",
""
]
] | Modifying a method by Horowitz and Hubeny for asymptotically anti-de Sitter black holes, we establish the classical stability of the quasinormal modes of the de Sitter spacetime. Furthermore using a straightforward method we calculate the de Sitter quasinormal frequencies of the gravitational perturbations and discuss ... |
1306.5971 | Mikhail M. Ivanov | Evgeny E. Bukzhalev, Mikhail M. Ivanov and Alexey V. Toporensky | Asymptotic solutions in f(R)-gravity | 23+10 pages, 7 figures, published version | Class. Quantum Grav. 31 (2014) 045017 | 10.1088/0264-9381/31/4/045017 | null | gr-qc astro-ph.CO math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study cosmological solutions in $R + \beta R^{N}$-gravity for an isotropic
Universe filled with ordinary matter with the equation of state parameter
$\gamma$. Using the Bogolyubov-Krylov-Mitropol'skii averaging method we find
asymptotic oscillatory solutions in terms of new functions, which have been
specially int... | [
{
"created": "Tue, 25 Jun 2013 14:00:22 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Jul 2013 14:34:02 GMT",
"version": "v2"
},
{
"created": "Fri, 6 Dec 2013 09:55:13 GMT",
"version": "v3"
},
{
"created": "Mon, 28 Apr 2014 11:07:07 GMT",
"version": "v4"
}
] | 2014-04-29 | [
[
"Bukzhalev",
"Evgeny E.",
""
],
[
"Ivanov",
"Mikhail M.",
""
],
[
"Toporensky",
"Alexey V.",
""
]
] | We study cosmological solutions in $R + \beta R^{N}$-gravity for an isotropic Universe filled with ordinary matter with the equation of state parameter $\gamma$. Using the Bogolyubov-Krylov-Mitropol'skii averaging method we find asymptotic oscillatory solutions in terms of new functions, which have been specially intro... |
1603.02444 | Ian Harry | Ian Harry, Stephen Privitera, Alejandro Boh\'e and Alessandra Buonanno | Searching for Gravitational Waves from Compact Binaries with Precessing
Spins | 21 pages, 9 figures. Updated to reflect published version in PRD | Phys. Rev. D 94, 024012 (2016) | 10.1103/PhysRevD.94.024012 | null | gr-qc astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Current searches for gravitational waves from compact-object binaries with
the LIGO and Virgo observatories employ waveform models with spins aligned (or
anti-aligned) with the orbital angular momentum. Here, we derive a new
statistic to search for compact objects carrying generic (precessing) spins.
Applying this st... | [
{
"created": "Tue, 8 Mar 2016 09:48:45 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jul 2016 09:48:08 GMT",
"version": "v2"
}
] | 2016-07-14 | [
[
"Harry",
"Ian",
""
],
[
"Privitera",
"Stephen",
""
],
[
"Bohé",
"Alejandro",
""
],
[
"Buonanno",
"Alessandra",
""
]
] | Current searches for gravitational waves from compact-object binaries with the LIGO and Virgo observatories employ waveform models with spins aligned (or anti-aligned) with the orbital angular momentum. Here, we derive a new statistic to search for compact objects carrying generic (precessing) spins. Applying this stat... |
1812.00343 | Chongoh Lee | Chong Oh Lee | Configurational entropy of tachyon kinks on unstable Dp-branes | 9 pages, 20 figures, typos corrected, added comments and references,
version to appear in PLB | null | 10.1016/j.physletb.2019.01.026 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider tachyon effective theory with Born-Infeld electromagnetic fields
and investigate the configurational entropy of the various tachyon kink
solutions. We find that the configurational entropy stats at a minimum value
and saturates to a maximum value as the negative pressure of pure tachyonic
field increases.... | [
{
"created": "Sun, 2 Dec 2018 06:56:23 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Jan 2019 09:59:53 GMT",
"version": "v2"
}
] | 2019-01-30 | [
[
"Lee",
"Chong Oh",
""
]
] | We consider tachyon effective theory with Born-Infeld electromagnetic fields and investigate the configurational entropy of the various tachyon kink solutions. We find that the configurational entropy stats at a minimum value and saturates to a maximum value as the negative pressure of pure tachyonic field increases. I... |
1907.10517 | Maximilian Thaller | Maximilian Thaller | Rotating Clouds of Charged Vlasov Matter in General Relativity | 32 pages | null | 10.1088/1361-6382/ab60ba | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The existence of stationary solutions of the Einstein-Vlasov-Maxwell system
which are axially symmetric but not spherically symmetric is proven by means of
the implicit function theorem on Banach spaces. The proof generalises the
methods of an article by H{\aa}kan Andr\'easson, Markus Kunze and Gerhard Rein
where a s... | [
{
"created": "Wed, 24 Jul 2019 15:29:31 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Aug 2019 15:06:23 GMT",
"version": "v2"
},
{
"created": "Mon, 4 Nov 2019 16:10:00 GMT",
"version": "v3"
}
] | 2020-01-29 | [
[
"Thaller",
"Maximilian",
""
]
] | The existence of stationary solutions of the Einstein-Vlasov-Maxwell system which are axially symmetric but not spherically symmetric is proven by means of the implicit function theorem on Banach spaces. The proof generalises the methods of an article by H{\aa}kan Andr\'easson, Markus Kunze and Gerhard Rein where a sim... |
0905.2055 | Chen Songbai | Songbai Chen, Jiliang Jing | Strong field gravitational lensing in the deformed H\v{o}rava-Lifshitz
black hole | 12 pages, 2 figures,some references added, Accepted by PRD | Phys.Rev.D80:024036,2009 | 10.1103/PhysRevD.80.024036 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Adopting the strong field limit approach, we studied the properties of strong
field gravitational lensing in the deformed H\v{o}rava-Lifshitz black hole and
obtained the angular position and magnification of the relativistic images.
Supposing that the gravitational field of the supermassive central object of
the gala... | [
{
"created": "Wed, 13 May 2009 10:24:46 GMT",
"version": "v1"
},
{
"created": "Sun, 17 May 2009 03:49:34 GMT",
"version": "v2"
},
{
"created": "Thu, 16 Jul 2009 03:56:35 GMT",
"version": "v3"
}
] | 2009-08-13 | [
[
"Chen",
"Songbai",
""
],
[
"Jing",
"Jiliang",
""
]
] | Adopting the strong field limit approach, we studied the properties of strong field gravitational lensing in the deformed H\v{o}rava-Lifshitz black hole and obtained the angular position and magnification of the relativistic images. Supposing that the gravitational field of the supermassive central object of the galaxy... |
gr-qc/9412050 | Bernard Linet | B. Linet | Euclidean spinor Green's functions in the spacetime of a straight cosmic
string | 20 pages, latex, no figures | J.Math.Phys. 36 (1995) 3694-3703 | 10.1063/1.530991 | GCR-941201 | gr-qc | null | We determine generally the spinor Green's function and the twisted spinor
Green's function in an Euclidean space with a conical-type line singularity. In
particular, in the neighbourhood of the point source, we expree them as a sum
of the usual Euclidean spinor Green's functin and a regular term. In four
dimensions, ... | [
{
"created": "Mon, 19 Dec 1994 16:30:44 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Linet",
"B.",
""
]
] | We determine generally the spinor Green's function and the twisted spinor Green's function in an Euclidean space with a conical-type line singularity. In particular, in the neighbourhood of the point source, we expree them as a sum of the usual Euclidean spinor Green's functin and a regular term. In four dimensions, we... |
2312.05457 | Chen Lan | Chen Lan, Meng-Hu Li, Yan-Gang Miao | Phase diagrams of quasinormal frequencies for Schwarzschild, Kerr, and
Taub-NUT black holes | Final version appearing in the PRD. 36 pages, 11 figures | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | The Newman-Janis algorithm, which involves complex-coordinate
transformations, establishes connections between static and spherically
symmetric black holes and rotating and/or axially symmetric ones, such as
between Schwarzschild black holes and Kerr black holes, and between
Schwarzschild black holes and Taub-NUT bla... | [
{
"created": "Sat, 9 Dec 2023 04:02:12 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Aug 2024 09:48:08 GMT",
"version": "v2"
}
] | 2024-08-15 | [
[
"Lan",
"Chen",
""
],
[
"Li",
"Meng-Hu",
""
],
[
"Miao",
"Yan-Gang",
""
]
] | The Newman-Janis algorithm, which involves complex-coordinate transformations, establishes connections between static and spherically symmetric black holes and rotating and/or axially symmetric ones, such as between Schwarzschild black holes and Kerr black holes, and between Schwarzschild black holes and Taub-NUT black... |
0910.4837 | Orest Hrycyna | Orest Hrycyna, Jakub Mielczarek, Marek Szydlowski | Asymmetric cyclic evolution in polymerised cosmology | 10 pages, 4 figs, JHEP3.cls | JCAP 0912:023,2009 | 10.1088/1475-7516/2009/12/023 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dynamical systems methods are used to study evolution of the polymerised
scalar field cosmologies with the cosmological constant. We have found all
evolutional paths admissible for all initial conditions on the two-dimensional
phase space. We have shown that the cyclic solutions are generic. The exact
solution fo... | [
{
"created": "Mon, 26 Oct 2009 19:35:16 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Hrycyna",
"Orest",
""
],
[
"Mielczarek",
"Jakub",
""
],
[
"Szydlowski",
"Marek",
""
]
] | The dynamical systems methods are used to study evolution of the polymerised scalar field cosmologies with the cosmological constant. We have found all evolutional paths admissible for all initial conditions on the two-dimensional phase space. We have shown that the cyclic solutions are generic. The exact solution for ... |
2111.11683 | Neeraj Kumar | Neeraj Kumar, Sunandan Gangopadhyay | Effects of Gauss-Bonnet gravity on thermodynamics of (3+1)$-D$ AdS black
holes | 13 pages, 6 figures, Comments are welcome | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We studied the thermodynamics of the black holes with Gauss-Bonnet correction
term in $3+1-$ dimensional AdS spacetime. It is known that the term has no
effect on the equation of motion, however, it modifies the entropy formula of
Wald as it has an effect of the Gauss-Bonnet parameter term. We studied charged
black h... | [
{
"created": "Tue, 23 Nov 2021 07:08:05 GMT",
"version": "v1"
}
] | 2021-11-24 | [
[
"Kumar",
"Neeraj",
""
],
[
"Gangopadhyay",
"Sunandan",
""
]
] | We studied the thermodynamics of the black holes with Gauss-Bonnet correction term in $3+1-$ dimensional AdS spacetime. It is known that the term has no effect on the equation of motion, however, it modifies the entropy formula of Wald as it has an effect of the Gauss-Bonnet parameter term. We studied charged black hol... |
1109.0740 | Johannes Tambornino | Johannes Tambornino | Relational Observables in Gravity: a Review | null | SIGMA 8 (2012), 017, 30 pages | 10.3842/SIGMA.2012.017 | null | gr-qc hep-th math-ph math.MP | http://creativecommons.org/licenses/by-nc-sa/3.0/ | We present an overview on relational observables in gravity mainly from a
loop quantum gravity perspective. The gauge group of general relativity is the
diffeomorphism group of the underlying manifold. Consequently, general
relativity is a totally constrained theory with vanishing canonical
Hamiltonian. This fact, of... | [
{
"created": "Sun, 4 Sep 2011 18:54:27 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Mar 2012 05:16:34 GMT",
"version": "v2"
}
] | 2012-03-29 | [
[
"Tambornino",
"Johannes",
""
]
] | We present an overview on relational observables in gravity mainly from a loop quantum gravity perspective. The gauge group of general relativity is the diffeomorphism group of the underlying manifold. Consequently, general relativity is a totally constrained theory with vanishing canonical Hamiltonian. This fact, ofte... |
1503.06994 | Artur Alho | Artur Alho, Juliette Hell and Claes Uggla | Global dynamics and asymptotics for monomial scalar field potentials and
perfect fluids | 33 pages, 12 figures. Matches final published version | null | null | null | gr-qc astro-ph.CO math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a minimally coupled scalar field with a monomial potential and a
perfect fluid in flat FLRW cosmology. We apply local and global dynamical
systems techniques to a new three-dimensional dynamical systems reformulation
of the field equations on a compact state space. This leads to a visual global
descriptio... | [
{
"created": "Tue, 24 Mar 2015 11:42:06 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Aug 2015 15:47:41 GMT",
"version": "v2"
}
] | 2015-08-05 | [
[
"Alho",
"Artur",
""
],
[
"Hell",
"Juliette",
""
],
[
"Uggla",
"Claes",
""
]
] | We consider a minimally coupled scalar field with a monomial potential and a perfect fluid in flat FLRW cosmology. We apply local and global dynamical systems techniques to a new three-dimensional dynamical systems reformulation of the field equations on a compact state space. This leads to a visual global description ... |
gr-qc/0405127 | Sukratu Barve | Sukratu Barve and A.R.Prasanna | Reissner Nordstr\"{o}m Background Metric in Dynamical Co-ordinates:
Exceptional Behaviour of Hadamard States | null | Class.Quant.Grav. 21 (2004) 1505 | 10.1088/0264-9381/21/6/016 | null | gr-qc | null | We cast the Reissner Nordstrom solution in a particular co-ordinate system
which shows dynamical evolution from initial data. The initial data for the
$E<M$ case is regular. This procedure enables us to treat the metric as a
collapse to a singularity. It also implies that one may assume Wald axioms to
be valid global... | [
{
"created": "Wed, 26 May 2004 04:31:09 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Barve",
"Sukratu",
""
],
[
"Prasanna",
"A. R.",
""
]
] | We cast the Reissner Nordstrom solution in a particular co-ordinate system which shows dynamical evolution from initial data. The initial data for the $E<M$ case is regular. This procedure enables us to treat the metric as a collapse to a singularity. It also implies that one may assume Wald axioms to be valid globally... |
2311.00659 | Konstantin Osetrin | Konstantin E. Osetrin and Vladimir Y. Epp and Sergey V. Chervon | Propagation of light and retarded time of radiation in a strong
gravitational wave | 27 pages | Annals of Physics 462 (2024), 169619 | null | null | gr-qc astro-ph.IM | http://creativecommons.org/licenses/by-nc-nd/4.0/ | For the strong gravitational wave model, an explicit transformation is
obtained from a privileged coordinate system with a wave variable to a
synchronous reference frame with separation of time and space variables. In a
synchronous reference frame, a general form of the gravitational wave metric,
solutions to the equ... | [
{
"created": "Wed, 1 Nov 2023 17:07:03 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Feb 2024 07:38:32 GMT",
"version": "v2"
}
] | 2024-02-14 | [
[
"Osetrin",
"Konstantin E.",
""
],
[
"Epp",
"Vladimir Y.",
""
],
[
"Chervon",
"Sergey V.",
""
]
] | For the strong gravitational wave model, an explicit transformation is obtained from a privileged coordinate system with a wave variable to a synchronous reference frame with separation of time and space variables. In a synchronous reference frame, a general form of the gravitational wave metric, solutions to the equat... |
1901.09711 | S Habib Mazharimousavi | M. Halilsoy and S. Habib Mazharimousavi | Interpolating the Schwarzschild and de-Sitter metrics | 6 pages, 3 figures published in IJMPD | International Journal of Modern Physics D 28, 1950038 (2019) | 10.1142/S021827181950038X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The binary potential technique of interpolation (by M. Riesz, Acta Math. 81,
1 (1949)) is applied to some well-known metrics of general relativity. These
include Schwarzschild, de Sitter and 2+1-dimensional BTZ spacetimes. In
particular, the Schwarzschild-de Sitter solution is analyzed in some detail
with a finite ra... | [
{
"created": "Fri, 25 Jan 2019 13:29:08 GMT",
"version": "v1"
}
] | 2019-01-29 | [
[
"Halilsoy",
"M.",
""
],
[
"Mazharimousavi",
"S. Habib",
""
]
] | The binary potential technique of interpolation (by M. Riesz, Acta Math. 81, 1 (1949)) is applied to some well-known metrics of general relativity. These include Schwarzschild, de Sitter and 2+1-dimensional BTZ spacetimes. In particular, the Schwarzschild-de Sitter solution is analyzed in some detail with a finite rang... |
1107.0996 | Frank Ohme | Frank Ohme, Mark Hannam, Sascha Husa | Reliability of complete gravitational waveform models for compact binary
coalescences | 16 pages, 8 figures, PDFLaTeX, updated presentation, consistent with
published PRD version | Phys. Rev. D 84, 064029 (2011) | 10.1103/PhysRevD.84.064029 | LIGO-P1100078; AEI-2011-039 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With recent advances in post-Newtonian (PN) theory and numerical relativity
(NR) it has become possible to construct inspiral-merger-ringdown waveforms by
combining both descriptions into one hybrid signal. While addressing the
reliability of such waveforms, previous studies have identified the PN
contribution as the... | [
{
"created": "Tue, 5 Jul 2011 21:29:23 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Sep 2011 11:07:16 GMT",
"version": "v2"
}
] | 2011-09-30 | [
[
"Ohme",
"Frank",
""
],
[
"Hannam",
"Mark",
""
],
[
"Husa",
"Sascha",
""
]
] | With recent advances in post-Newtonian (PN) theory and numerical relativity (NR) it has become possible to construct inspiral-merger-ringdown waveforms by combining both descriptions into one hybrid signal. While addressing the reliability of such waveforms, previous studies have identified the PN contribution as the d... |
1408.4958 | Andrea Geralico | Donato Bini and Andrea Geralico | Scattering by an electromagnetic radiation field | 13 pages, 2 figures; published version | Phys. Rev. D 85, 044001 (2012) | 10.1103/PhysRevD.85.044001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motion of test particles in the gravitational field associated with an
electromagnetic plane wave is investigated. The interaction with the radiation
field is modeled by a force term {\it \`a la} Poynting-Robertson entering the
equations of motion given by the 4-momentum density of radiation observed in
the particle'... | [
{
"created": "Thu, 21 Aug 2014 11:05:59 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Bini",
"Donato",
""
],
[
"Geralico",
"Andrea",
""
]
] | Motion of test particles in the gravitational field associated with an electromagnetic plane wave is investigated. The interaction with the radiation field is modeled by a force term {\it \`a la} Poynting-Robertson entering the equations of motion given by the 4-momentum density of radiation observed in the particle's ... |
1604.01798 | Joshua Cooperman | Joshua H. Cooperman | Comments on "Searching for a continuum limit in CDT quantum gravity" | 3 pages plus references | null | null | null | gr-qc hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To facilitate the search for a continuum limit of causal dynamical
triangulations, Ambjorn, Coumbe, Gizbert-Studnicki, and Jurkiewicz recently
reported measurements of the lattice spacing as a function of the bare
couplings. Although these authors' methods are technically sound, the
conclusions that they draw from th... | [
{
"created": "Wed, 6 Apr 2016 20:20:51 GMT",
"version": "v1"
}
] | 2016-04-08 | [
[
"Cooperman",
"Joshua H.",
""
]
] | To facilitate the search for a continuum limit of causal dynamical triangulations, Ambjorn, Coumbe, Gizbert-Studnicki, and Jurkiewicz recently reported measurements of the lattice spacing as a function of the bare couplings. Although these authors' methods are technically sound, the conclusions that they draw from thei... |
1809.03496 | Purnendu Karmakar | Alexander Ganz, Nicola Bartolo, Purnendu Karmakar, and Sabino
Matarrese | Gravity in mimetic scalar-tensor theories after GW170817 | 20 pages, 0 figures | null | 10.1088/1475-7516/2019/01/056 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the most general mimetic scalar-tensor theory assuming a healthy
"seed" action and accounting for the constraints on the speed of
gravitational-wave propagation arising from the GW170817 event. By analysing
linear perturbations around a flat FLRW background in this model, we obtain a
suitable form of the Po... | [
{
"created": "Mon, 10 Sep 2018 21:49:03 GMT",
"version": "v1"
}
] | 2019-02-13 | [
[
"Ganz",
"Alexander",
""
],
[
"Bartolo",
"Nicola",
""
],
[
"Karmakar",
"Purnendu",
""
],
[
"Matarrese",
"Sabino",
""
]
] | We derive the most general mimetic scalar-tensor theory assuming a healthy "seed" action and accounting for the constraints on the speed of gravitational-wave propagation arising from the GW170817 event. By analysing linear perturbations around a flat FLRW background in this model, we obtain a suitable form of the Pois... |
gr-qc/9411062 | Vassilevich Dmitri | Dmitri V.Vassilevich | Heat kernel for antisymmetric tensor field on a disk | Latex, 9 pages, no figures | Phys.Lett. B348 (1995) 39-43 | 10.1016/0370-2693(95)00120-A | IC/94/373 , ICTP, Trieste | gr-qc hep-th | null | We suggest a method of reduction of mixed absolute and relative boundary
conditions to pure ones. The case of rank two tensor is studied in detail. For
four-dimensional disk the corresponding heat kernel is expressed in terms of
scalar heat kernels. The result for scaling behavior $\zeta (0)$ agrees with
previous cal... | [
{
"created": "Thu, 24 Nov 1994 16:07:07 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Vassilevich",
"Dmitri V.",
""
]
] | We suggest a method of reduction of mixed absolute and relative boundary conditions to pure ones. The case of rank two tensor is studied in detail. For four-dimensional disk the corresponding heat kernel is expressed in terms of scalar heat kernels. The result for scaling behavior $\zeta (0)$ agrees with previous calcu... |
1602.08914 | Andronikos Paliathanasis | Andronikos Paliathanasis and Salvatore Capozziello | Noether symmetries and duality transformations in cosmology | 12 pages; discussion improved; to appear in MPLA | null | 10.1142/S0217732316501832 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the relation between Noether (point) symmetries and discrete
symmetries for a class of minisuperspace cosmological models. We show that when
a Noether symmetry exists for the gravitational Lagrangian then there exists a
coordinate system in which a reversal symmetry exists. Moreover as far as
concerns the ... | [
{
"created": "Mon, 29 Feb 2016 11:41:56 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Apr 2016 12:33:33 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Apr 2016 12:42:23 GMT",
"version": "v3"
},
{
"created": "Thu, 18 Aug 2016 07:45:31 GMT",
"version": "v4"
}
] | 2016-10-12 | [
[
"Paliathanasis",
"Andronikos",
""
],
[
"Capozziello",
"Salvatore",
""
]
] | We discuss the relation between Noether (point) symmetries and discrete symmetries for a class of minisuperspace cosmological models. We show that when a Noether symmetry exists for the gravitational Lagrangian then there exists a coordinate system in which a reversal symmetry exists. Moreover as far as concerns the sc... |
1403.7277 | Fangyu Li | H. Wen, F.Y. Li, Z.Y. Fang, A. Beckwith | Impulsive cylindrical gravitational wave: one possible radiative form
emitted from cosmic strings and corresponding electromagnetic response | 34 pages, 12 figures | null | 10.1140/epjc/s10052-014-2998-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The cosmic strings(CSs) may be one important source of gravitational
waves(GWs), and it has been intensively studied due to its special properties
such as the cylindrical symmetry. The CSs would generate not only usual
continuous GW, but also impulsive GW that brings more concentrated energy and
consists of different... | [
{
"created": "Fri, 28 Mar 2014 03:54:10 GMT",
"version": "v1"
},
{
"created": "Sun, 4 May 2014 08:22:36 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Wen",
"H.",
""
],
[
"Li",
"F. Y.",
""
],
[
"Fang",
"Z. Y.",
""
],
[
"Beckwith",
"A.",
""
]
] | The cosmic strings(CSs) may be one important source of gravitational waves(GWs), and it has been intensively studied due to its special properties such as the cylindrical symmetry. The CSs would generate not only usual continuous GW, but also impulsive GW that brings more concentrated energy and consists of different G... |
gr-qc/9712010 | Matt Visser | Matt Visser (Washington University) | Acoustic black holes: horizons, ergospheres, and Hawking radiation | 34 pages, plain LaTeX. Revisions: Two references added. Minor changes
to the discussion of draining-bathtub geometries, and their relationship to
superfluid vortices and spinning cosmic strings | Class.Quant.Grav. 15 (1998) 1767-1791 | 10.1088/0264-9381/15/6/024 | null | gr-qc hep-th | null | It is a deceptively simple question to ask how acoustic disturbances
propagate in a non-homogeneous flowing fluid. This question can be answered by
invoking the language of Lorentzian differential geometry: If the fluid is
barotropic and inviscid, and the flow is irrotational (though possibly time
dependent), then th... | [
{
"created": "Mon, 1 Dec 1997 23:19:43 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Dec 1997 02:44:03 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Visser",
"Matt",
"",
"Washington University"
]
] | It is a deceptively simple question to ask how acoustic disturbances propagate in a non-homogeneous flowing fluid. This question can be answered by invoking the language of Lorentzian differential geometry: If the fluid is barotropic and inviscid, and the flow is irrotational (though possibly time dependent), then the ... |
2201.04512 | Salvatore Capozziello | Salvatore Capozziello and Francesco Bajardi | Non-Local Gravity Cosmology: an Overview | 43 pages, 5 figures, to appear in Int. J. Mod. Phys. D | null | 10.1142/S0218271822300099 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss some main aspects of theories of gravity containing non-local
terms in view of cosmological applications. In particular, we consider various
extensions of General Relativity based on geometrical invariants as $f(R,
\Box^{-1} R)$, $f({\cal G}, \Box^{-1} {\cal G})$ and $f(T, \Box^{-1} T)$
gravity where $R$ i... | [
{
"created": "Wed, 12 Jan 2022 15:17:04 GMT",
"version": "v1"
}
] | 2022-01-13 | [
[
"Capozziello",
"Salvatore",
""
],
[
"Bajardi",
"Francesco",
""
]
] | We discuss some main aspects of theories of gravity containing non-local terms in view of cosmological applications. In particular, we consider various extensions of General Relativity based on geometrical invariants as $f(R, \Box^{-1} R)$, $f({\cal G}, \Box^{-1} {\cal G})$ and $f(T, \Box^{-1} T)$ gravity where $R$ is ... |
1510.03138 | Jian-Yang Zhu | Xiao-Min Zhang, Hong-Yang Ma, Peng-Cheng Chu, Jun-Ting Liu, Jian-Yang
Zhu | Primordial non-Gaussianity in warm inflation using $\delta N$ formalism | 9 pages, 5 figures | J. Cosmol. Astropart. Phys. 03(2016)059 | 10.1088/1475-7516/2016/03/059 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A $\delta N$ formalism is used to study the non-Gaussianity of the primordial
curvature perturbation on an uniform density hypersurfaces generated by the
warm inflation for the first time. After introducing the framework of the warm
inflation and the $\delta N$ formalism, we obtain an analytic expression for
the nonl... | [
{
"created": "Mon, 12 Oct 2015 04:43:18 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Nov 2015 14:43:45 GMT",
"version": "v2"
}
] | 2016-04-01 | [
[
"Zhang",
"Xiao-Min",
""
],
[
"Ma",
"Hong-Yang",
""
],
[
"Chu",
"Peng-Cheng",
""
],
[
"Liu",
"Jun-Ting",
""
],
[
"Zhu",
"Jian-Yang",
""
]
] | A $\delta N$ formalism is used to study the non-Gaussianity of the primordial curvature perturbation on an uniform density hypersurfaces generated by the warm inflation for the first time. After introducing the framework of the warm inflation and the $\delta N$ formalism, we obtain an analytic expression for the nonlin... |
gr-qc/0701094 | Riccardo Benini | Riccardo Benini, Giovanni Montani | Classical and Quantum Aspects of the Inhomogeneous Mixmaster Chaoticity | 3 pages, 2 figures, proceedings of the XI Marcel Grossmann meeting on
Relativistic Astrophysics, July 23-29, 2006, Berlin | null | 10.1142/9789812834300_0284 | null | gr-qc | null | We refine Misner's analysis of the classical and quantum Mixmaster in the
fully inhomogeneous picture; we both connect the quantum behavior to the
ensemble representation, both describe the precise effect of the boundary
conditions on the structure of the quantum states.
| [
{
"created": "Tue, 16 Jan 2007 14:42:49 GMT",
"version": "v1"
}
] | 2016-11-15 | [
[
"Benini",
"Riccardo",
""
],
[
"Montani",
"Giovanni",
""
]
] | We refine Misner's analysis of the classical and quantum Mixmaster in the fully inhomogeneous picture; we both connect the quantum behavior to the ensemble representation, both describe the precise effect of the boundary conditions on the structure of the quantum states. |
1305.6341 | Qing-Yu Cai | Baocheng Zhang, Qing-yu Cai, Ming-sheng Zhan, and Li You | Information conservation is fundamental: recovering the lost information
in Hawking radiation | First Award in the 2013 Awards for Essays on Gravitation | International Journal of Modern Physics D 22 (2013) 1341014 | 10.1142/S0218271813410149 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In both classical and quantum world, information cannot appear or disappear.
This fundamental principle, however, is questioned for a black hole, by the
acclaimed "information loss paradox". Based on the conservation laws of energy,
charge, and angular momentum, we recently show the total information encoded in
the c... | [
{
"created": "Mon, 27 May 2013 23:18:28 GMT",
"version": "v1"
}
] | 2013-08-13 | [
[
"Zhang",
"Baocheng",
""
],
[
"Cai",
"Qing-yu",
""
],
[
"Zhan",
"Ming-sheng",
""
],
[
"You",
"Li",
""
]
] | In both classical and quantum world, information cannot appear or disappear. This fundamental principle, however, is questioned for a black hole, by the acclaimed "information loss paradox". Based on the conservation laws of energy, charge, and angular momentum, we recently show the total information encoded in the cor... |
1509.06209 | Francesco Pannarale | Francesco Pannarale, Emanuele Berti, Koutarou Kyutoku, Benjamin D.
Lackey, Masaru Shibata | Gravitational-wave cutoff frequencies of tidally disruptive neutron
star-black hole binary mergers | 5 pages, 2 figures, 1 table. arXiv admin note: text overlap with
arXiv:1509.00512 | null | 10.1103/PhysRevD.92.081504 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Tidal disruption has a dramatic impact on the outcome of neutron star-black
hole mergers. The phenomenology of these systems can be divided in three
classes: nondisruptive, mildly disruptive or disruptive. The cutoff frequency
of the gravitational radiation produced during the merger (which is potentially
measurable ... | [
{
"created": "Mon, 21 Sep 2015 12:55:08 GMT",
"version": "v1"
}
] | 2015-11-04 | [
[
"Pannarale",
"Francesco",
""
],
[
"Berti",
"Emanuele",
""
],
[
"Kyutoku",
"Koutarou",
""
],
[
"Lackey",
"Benjamin D.",
""
],
[
"Shibata",
"Masaru",
""
]
] | Tidal disruption has a dramatic impact on the outcome of neutron star-black hole mergers. The phenomenology of these systems can be divided in three classes: nondisruptive, mildly disruptive or disruptive. The cutoff frequency of the gravitational radiation produced during the merger (which is potentially measurable by... |
gr-qc/9707027 | Viqar Husain | David Brown and Viqar Husain | Black holes with short hair | 11 pages, latex, reference added, to appear in Int. J. Mod. Phys. D | Int.J.Mod.Phys. D6 (1997) 563-573 | 10.1142/S0218271897000340 | CGPG-97/7-1 | gr-qc hep-th | null | We present spherically symmetric black hole solutions for Einstein gravity
coupled to anisotropic matter. We show that these black holes have arbitrarily
short hair, and argue for stability by showing that they can arise from
dynamical collapse. We also show that a recent `no short hair' theorem does not
apply to the... | [
{
"created": "Sun, 13 Jul 1997 16:39:35 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Jul 1997 18:17:28 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Brown",
"David",
""
],
[
"Husain",
"Viqar",
""
]
] | We present spherically symmetric black hole solutions for Einstein gravity coupled to anisotropic matter. We show that these black holes have arbitrarily short hair, and argue for stability by showing that they can arise from dynamical collapse. We also show that a recent `no short hair' theorem does not apply to these... |
1207.5626 | XiaoXiong Zeng | YiWen Han, Gang Chen | Thermodynamics, geometrothermodynamics and critical behavior of
(2+1)-dimensional black holes | Accepted by PLB. arXiv admin note: text overlap with arXiv:0811.2524,
arXiv:0902.4488, arXiv:0805.3003 by other authors | PLB 714 (2012) 127-130 | 10.1016/j.physletb.2012.06.068 | null | gr-qc | http://creativecommons.org/licenses/by/3.0/ | In this paper, we study the properties of the (2+1)-dimensional black holes
from the viewpoint of geometrothermodynamics. We show that the Legendre
invariant metric of the (2+1)-dimensional black holes can produce correctly the
behavior of the thermodynamic interaction and phase transition structure of the
correspond... | [
{
"created": "Tue, 24 Jul 2012 09:04:54 GMT",
"version": "v1"
}
] | 2015-06-05 | [
[
"Han",
"YiWen",
""
],
[
"Chen",
"Gang",
""
]
] | In this paper, we study the properties of the (2+1)-dimensional black holes from the viewpoint of geometrothermodynamics. We show that the Legendre invariant metric of the (2+1)-dimensional black holes can produce correctly the behavior of the thermodynamic interaction and phase transition structure of the correspondin... |
gr-qc/0209080 | John Barrow | John D. Barrow | Constants and Variations: From Alpha to Omega | 18 pages, no figures. Plenary Talk presented at the JENAM 2002
Workshop on Varying Fundamental Constants, Porto, 5th September 2002. To be
published in the Conference Proceedings | Astrophys.Space Sci.283:645-660,2003 | 10.1023/A:1022571927342 | null | gr-qc astro-ph hep-th | null | We review some of the history and properties of theories for the variation of
the gravitation and fine structure 'constants'. We highlight some general
features of the cosmological models that exist in these theories with reference
to recent quasar data that is consistent with time-variation in alpha since a
redshift... | [
{
"created": "Mon, 23 Sep 2002 12:24:52 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Barrow",
"John D.",
""
]
] | We review some of the history and properties of theories for the variation of the gravitation and fine structure 'constants'. We highlight some general features of the cosmological models that exist in these theories with reference to recent quasar data that is consistent with time-variation in alpha since a redshift o... |
gr-qc/9607064 | Nils Andersson | Nils Andersson | Evolving test-fields in a black-hole geometry | 13 pages, 6 postscript figures | Phys. Rev. D 55, 468 (1997) | 10.1103/PhysRevD.55.468 | Preprint no WUGRAV 96-6 | gr-qc | null | We consider the initial value problem for a massless scalar field in the
Schwarzschild geometry. When constructed using a complex-frequency approach the
necessary Green's function splits into three components. We discuss all of
these in some detail: 1) The contribution from the singularities (the
quasinormal modes of... | [
{
"created": "Thu, 25 Jul 1996 16:28:30 GMT",
"version": "v1"
}
] | 2016-08-24 | [
[
"Andersson",
"Nils",
""
]
] | We consider the initial value problem for a massless scalar field in the Schwarzschild geometry. When constructed using a complex-frequency approach the necessary Green's function splits into three components. We discuss all of these in some detail: 1) The contribution from the singularities (the quasinormal modes of t... |
gr-qc/0005001 | Luis Bel | Ll. Bel | Post-Newtonian Frames of Reference | This preprint will not be submitted for publication, but the Author
is willing to consider any proposal emanating from any interested scientific
journal | null | null | null | gr-qc | null | A general theory of frames of reference proposed in a preceding publication
is considered here in the framework of the post-Newtonian approximation,
assuming that the frame of reference is centered on a time-like geodesic. The
problem of taking into account the rotation of the frame of reference, which is
usually ign... | [
{
"created": "Sun, 30 Apr 2000 13:24:28 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bel",
"Ll.",
""
]
] | A general theory of frames of reference proposed in a preceding publication is considered here in the framework of the post-Newtonian approximation, assuming that the frame of reference is centered on a time-like geodesic. The problem of taking into account the rotation of the frame of reference, which is usually ignor... |
gr-qc/9710060 | Georges Bressange | C. Barrab\`es, G.F. Bressange and P.A. Hogan | Abrupt Changes in the Multipole Moments of a Gravitating Body | 4 pages, latex, no figures, to appear in the Proceedings of the Eigth
Marcel Grossmann Meeting of Jerusalem (22-27 june, 1997) | null | null | null | gr-qc | null | An example is described in which an asymptotically flat static vacuum Weyl
space-time experiences a sudden change across a null hypersurface in the
multipole moments of its isolated axially symmetric source. A light-like shell
and an impulsive gravitational wave are identified, both having the null
hypersurface as hi... | [
{
"created": "Fri, 10 Oct 1997 13:49:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Barrabès",
"C.",
""
],
[
"Bressange",
"G. F.",
""
],
[
"Hogan",
"P. A.",
""
]
] | An example is described in which an asymptotically flat static vacuum Weyl space-time experiences a sudden change across a null hypersurface in the multipole moments of its isolated axially symmetric source. A light-like shell and an impulsive gravitational wave are identified, both having the null hypersurface as hist... |
1903.01877 | Luciano Combi | Luciano Combi and Gustavo E. Romero | Electromagnetic fields and charges in expanding universes | 19 pages, 2 figures, accepted for publication in PRD | null | 10.1103/PhysRevD.99.064017 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the properties of the electric and magnetic fields in different
reference frames within a cosmological background space-time. First, we
investigate the conformal properties of the electromagnetic fields and charge
currents, discussing how the spatial curvature of the universe affects the
field on different... | [
{
"created": "Tue, 5 Mar 2019 14:59:44 GMT",
"version": "v1"
}
] | 2019-03-27 | [
[
"Combi",
"Luciano",
""
],
[
"Romero",
"Gustavo E.",
""
]
] | We analyze the properties of the electric and magnetic fields in different reference frames within a cosmological background space-time. First, we investigate the conformal properties of the electromagnetic fields and charge currents, discussing how the spatial curvature of the universe affects the field on different s... |
2403.02128 | Giampiero Esposito Dr. | Donato Bini, Giampiero Esposito | Projective path to points at infinity in spherically symmetric
spacetimes | 16 pages in double-column format; 18 plots in 14 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper points out that, in a four-dimensional spacetime manifold, the
four coordinates of any point may be viewed as arising from five homogeneous
coordinates according to the well-established recipes of projective geometry.
Moreover, if the homogeneous coordinates change by a linear transformation,
ruled by the ... | [
{
"created": "Mon, 4 Mar 2024 15:35:44 GMT",
"version": "v1"
}
] | 2024-03-05 | [
[
"Bini",
"Donato",
""
],
[
"Esposito",
"Giampiero",
""
]
] | This paper points out that, in a four-dimensional spacetime manifold, the four coordinates of any point may be viewed as arising from five homogeneous coordinates according to the well-established recipes of projective geometry. Moreover, if the homogeneous coordinates change by a linear transformation, ruled by the co... |
1404.2801 | Viktor Toth | Viktor T. Toth | Accelerating classical charges and the equivalence principle | 3 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compare the behavior of a charged particle in a gravitational field and
empty space. We resolve the apparent conflict between the Lorentz-Dirac
equation and Larmor's formula of radiation by noting that the former describes
an electron that is itself accelerated by an electromagnetic field. If instead,
a hypothetic... | [
{
"created": "Thu, 10 Apr 2014 13:37:48 GMT",
"version": "v1"
}
] | 2014-04-11 | [
[
"Toth",
"Viktor T.",
""
]
] | We compare the behavior of a charged particle in a gravitational field and empty space. We resolve the apparent conflict between the Lorentz-Dirac equation and Larmor's formula of radiation by noting that the former describes an electron that is itself accelerated by an electromagnetic field. If instead, a hypothetical... |
gr-qc/0207003 | Giovanni Amelino-Camelia | Alessandra Agostini, Giovanni Amelino-Camelia and Michele Arzano | Dirac spinors for Doubly Special Relativity and $\kappa$-Minkowski
noncommutative spacetime | 26 pages, LaTex. v2: Alessandra Agostini (contributing some results
from her PhD thesis) is added to the list of authors. The results presented
in v1 remain unchanged and are contained in Section 2. Sections 3,4,5 add
results not present in v1, concerning the realization of the DSR-deformed
Dirac equation in ka... | Class.Quant.Grav. 21 (2004) 2179-2202 | 10.1088/0264-9381/21/8/018 | null | gr-qc | null | We construct a Dirac equation that is consistent with one of the
recently-proposed schemes for a "doubly-special relativity", a relativity with
both an observer-independent velocity scale (still naturally identified with
the speed-of-light constant) and an observer-independent length/momentum scale
(possibly given by... | [
{
"created": "Sat, 29 Jun 2002 17:51:38 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Dec 2003 08:09:02 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Agostini",
"Alessandra",
""
],
[
"Amelino-Camelia",
"Giovanni",
""
],
[
"Arzano",
"Michele",
""
]
] | We construct a Dirac equation that is consistent with one of the recently-proposed schemes for a "doubly-special relativity", a relativity with both an observer-independent velocity scale (still naturally identified with the speed-of-light constant) and an observer-independent length/momentum scale (possibly given by t... |
2302.05125 | Roberto Dale | Roberto Dale, Ramon Lapiedra and Juan Antonio Morales-Lladosa | Cosmic primordial density fluctuations and Bell inequalities | 15 pages, 4 figures | Phys. Rev. D 107, 023506 (2023) | 10.1103/PhysRevD.107.023506 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The temperature measurements, $T$, of the perturbed cosmic microwave
background, performed by the cosmic background explorer satellite (COBE), are
considered. A dichotomist function, $f = \pm 1$, is defined such that $f =+1$
if $\delta T > 0$ and $f =-1$ if $\delta T < 0$, where $\delta T$ stands for
the fluctuation ... | [
{
"created": "Fri, 10 Feb 2023 09:14:21 GMT",
"version": "v1"
}
] | 2023-02-13 | [
[
"Dale",
"Roberto",
""
],
[
"Lapiedra",
"Ramon",
""
],
[
"Morales-Lladosa",
"Juan Antonio",
""
]
] | The temperature measurements, $T$, of the perturbed cosmic microwave background, performed by the cosmic background explorer satellite (COBE), are considered. A dichotomist function, $f = \pm 1$, is defined such that $f =+1$ if $\delta T > 0$ and $f =-1$ if $\delta T < 0$, where $\delta T$ stands for the fluctuation of... |
1603.06997 | Laszlo B. Szabados | L\'aszl\'o B Szabados | Gravity, as a classical regulator for the Higgs field, and the origin of
rest masses and electric charge | 46 pages; significantly rewritten, conclusions sharpened,
arXiv:1605.04811 (on example with the Kantowski--Sachs spacetimes) included,
typos corrected, three figures added; text slightly improved, references
updated. The short version (viz arXiv:1802.04401) appears in Gen.Rel.Grav | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The classical Einstein--Standard Model system with conformally invariant
coupling of the Higgs field to gravity is investigated. We show that the
energy-momentum tensor is not polynomial in the Higgs field, and hence it may
have two singularities: In cosmological spacetimes the usual Big Bang type
singularity with di... | [
{
"created": "Tue, 22 Mar 2016 21:40:02 GMT",
"version": "v1"
},
{
"created": "Mon, 16 May 2016 15:36:42 GMT",
"version": "v2"
},
{
"created": "Mon, 29 May 2017 23:53:08 GMT",
"version": "v3"
},
{
"created": "Sat, 17 Feb 2018 23:14:33 GMT",
"version": "v4"
}
] | 2018-02-20 | [
[
"Szabados",
"László B",
""
]
] | The classical Einstein--Standard Model system with conformally invariant coupling of the Higgs field to gravity is investigated. We show that the energy-momentum tensor is not polynomial in the Higgs field, and hence it may have two singularities: In cosmological spacetimes the usual Big Bang type singularity with dive... |
2305.12323 | Cheng Liu | Cheng Liu, Haiguang Xu, Hoongwah Siew, Tao Zhu, Qiang Wu, Yuanyuan
Zhao | Constraints on the rotating self-dual black hole with quasi-periodic
oscillations | null | null | 10.1088/1475-7516/2023/11/096 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An impressive feature of loop quantum gravity (LQG) is that it can elegantly
resolve both the big bang and black hole singularities. By using the
Newman-Janis algorithm, a regular and effective rotating self-dual black
hole(SDBH) metric could be constructed, which alters the Kerr geometry with a
polymeric function $P... | [
{
"created": "Sun, 21 May 2023 03:03:32 GMT",
"version": "v1"
},
{
"created": "Tue, 23 May 2023 14:46:47 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Jul 2023 08:49:20 GMT",
"version": "v3"
}
] | 2024-06-03 | [
[
"Liu",
"Cheng",
""
],
[
"Xu",
"Haiguang",
""
],
[
"Siew",
"Hoongwah",
""
],
[
"Zhu",
"Tao",
""
],
[
"Wu",
"Qiang",
""
],
[
"Zhao",
"Yuanyuan",
""
]
] | An impressive feature of loop quantum gravity (LQG) is that it can elegantly resolve both the big bang and black hole singularities. By using the Newman-Janis algorithm, a regular and effective rotating self-dual black hole(SDBH) metric could be constructed, which alters the Kerr geometry with a polymeric function $P$ ... |
1401.4846 | Donato Bini | Donato Bini, Andrea Geralico, Daniele Gregoris, Sauro Succi | Scalar field inflation and Shan-Chen fluid models | 9 pages, 5 figures; published version. The title has been changed. A
new section (Section III A) has been added describing the main features of
the Shan-Chen equation of state in the original context wherein it has been
introduced. The stability issue of the model is also discussed in the
Appendix | Phys. Rev. D 90, 044021 (2014) | 10.1103/PhysRevD.90.044021 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A scalar field equivalent to a non-ideal "dark energy fluid" obeying a
Shan-Chen-like equation of state is used as the background source of a flat
Friedmann-Robertson-Walker cosmological spacetime to describe the inflationary
epoch of our universe. Within the slow-roll approximation, a number of
interesting features ... | [
{
"created": "Mon, 20 Jan 2014 09:59:26 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Aug 2014 10:08:31 GMT",
"version": "v2"
}
] | 2015-06-18 | [
[
"Bini",
"Donato",
""
],
[
"Geralico",
"Andrea",
""
],
[
"Gregoris",
"Daniele",
""
],
[
"Succi",
"Sauro",
""
]
] | A scalar field equivalent to a non-ideal "dark energy fluid" obeying a Shan-Chen-like equation of state is used as the background source of a flat Friedmann-Robertson-Walker cosmological spacetime to describe the inflationary epoch of our universe. Within the slow-roll approximation, a number of interesting features ar... |
1910.01929 | Xiaoning Wu | Xiaoning Wu and Lin Zhang | The Null-Timelike Boundary Problems of Linear Wave Equations in
Asymptotically Anti-de Sitter Space | 18 pages, 2 figures. arXiv admin note: text overlap with
arXiv:1801.02795 | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the linear wave equations in an asymptotically
anti-de Sitter spacetime. We will consider the mixed boundary problem, where
the initial data are given on an outgoing null hypersurface and a timelike
hypersurface, and the asymptotic information is given on conformal infinity.
| [
{
"created": "Thu, 3 Oct 2019 14:49:32 GMT",
"version": "v1"
}
] | 2019-10-07 | [
[
"Wu",
"Xiaoning",
""
],
[
"Zhang",
"Lin",
""
]
] | In this paper, we study the linear wave equations in an asymptotically anti-de Sitter spacetime. We will consider the mixed boundary problem, where the initial data are given on an outgoing null hypersurface and a timelike hypersurface, and the asymptotic information is given on conformal infinity. |
2110.10243 | Richard Udall | Richard Udall, Joshua Brandt, Grihith Manchanda, Adhav Arulanandan,
James Clark, Jacob Lange, Richard O'Shaughnessy, Laura Cadonati | RUNMON-RIFT: Adaptive Configuration and Healing for Large-Scale
Parameter Inference | 9 pages, 2 figures | null | null | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational wave parameter inference pipelines operate on data containing
unknown sources on distributed hardware with unreliable performance. For one
specific analysis pipeline (RIFT), we have developed a flexible tool
(RUNMON-RIFT) to mitigate the most common challenges introduced by these two
uncertainties. On t... | [
{
"created": "Tue, 19 Oct 2021 20:29:10 GMT",
"version": "v1"
}
] | 2021-10-22 | [
[
"Udall",
"Richard",
""
],
[
"Brandt",
"Joshua",
""
],
[
"Manchanda",
"Grihith",
""
],
[
"Arulanandan",
"Adhav",
""
],
[
"Clark",
"James",
""
],
[
"Lange",
"Jacob",
""
],
[
"O'Shaughnessy",
"Richard",
""
]... | Gravitational wave parameter inference pipelines operate on data containing unknown sources on distributed hardware with unreliable performance. For one specific analysis pipeline (RIFT), we have developed a flexible tool (RUNMON-RIFT) to mitigate the most common challenges introduced by these two uncertainties. On the... |
gr-qc/0602095 | Lorenzo Iorio | Lorenzo Iorio | Solar System planetary orbital motions and dark matter | Latex, 8 pages, 2 tables, no figures, 8 references. Revised version
with improved analysis | JCAP 0605 (2006) 002 | 10.1088/1475-7516/2006/05/002 | null | gr-qc astro-ph hep-ph | null | In this paper we explicitly work out the effects that a spherically symmetric
distribution of dark matter with constant density would induce on the Keplerian
orbital elements of the Solar System planets and compare them with the latest
results in planetary orbit determination from the EPM2004 ephemerides. It turns
ou... | [
{
"created": "Thu, 23 Feb 2006 15:28:02 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Mar 2006 12:50:01 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Iorio",
"Lorenzo",
""
]
] | In this paper we explicitly work out the effects that a spherically symmetric distribution of dark matter with constant density would induce on the Keplerian orbital elements of the Solar System planets and compare them with the latest results in planetary orbit determination from the EPM2004 ephemerides. It turns out ... |
2201.00671 | Gustavo Dotti | B\'eatrice Bonga and Gustavo Dotti | Parallel waves in Einstein-non linear sigma models | Final version, to appear in PRD | null | 10.1103/PhysRevD.105.044049 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a family of solutions of Einstein-non linear sigma models with $S^2$
and $SU(2) \sim S^3$ target manifolds. In the $S^2$ case, the solutions are
smooth everywhere, free of conical singularities, and approach asymptotically
the metric of a cosmic string, with a mass per length that is proportional to
the abso... | [
{
"created": "Mon, 3 Jan 2022 14:23:46 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Feb 2022 09:20:57 GMT",
"version": "v2"
}
] | 2022-03-09 | [
[
"Bonga",
"Béatrice",
""
],
[
"Dotti",
"Gustavo",
""
]
] | We study a family of solutions of Einstein-non linear sigma models with $S^2$ and $SU(2) \sim S^3$ target manifolds. In the $S^2$ case, the solutions are smooth everywhere, free of conical singularities, and approach asymptotically the metric of a cosmic string, with a mass per length that is proportional to the absolu... |
0909.0316 | Piotr Bizon | Piotr Bizo\'n, Tadeusz Chmaj, and Andrzej Rostworowski | Reply to the comment by Szpak on leading order asymptotics of late-time
tails for a self-gravitating massless scalar field | 1 page | Class.Quant.Grav.26:248002,2009 | 10.1088/0264-9381/26/24/248002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We respond to N. Szpak's comment [arXiv:0907.5146v2] on our paper "Late-time
tails of a self-gravitating massless scalar field, revisited", Class. Quantum
Grav. 26, 175006 (2009). [arXiv:0812.4333]
| [
{
"created": "Wed, 2 Sep 2009 04:50:55 GMT",
"version": "v1"
}
] | 2010-03-25 | [
[
"Bizoń",
"Piotr",
""
],
[
"Chmaj",
"Tadeusz",
""
],
[
"Rostworowski",
"Andrzej",
""
]
] | We respond to N. Szpak's comment [arXiv:0907.5146v2] on our paper "Late-time tails of a self-gravitating massless scalar field, revisited", Class. Quantum Grav. 26, 175006 (2009). [arXiv:0812.4333] |
2305.04551 | Gang Wang | Rong-Gen Cai, Zong-Kuan Guo, Bin Hu, Chang Liu, Youjun Lu, Wei-Tou Ni,
Wen-Hong Ruan, Naoki Seto, Gang Wang, Yue-Liang Wu | On networks of space-based gravitational-wave detectors | 32 pages, 14 figures, reviews on recent studies about space-borne GW
networks, comments and feedbacks are welcome | null | null | null | gr-qc astro-ph.CO astro-ph.GA astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The space-based laser interferometers, LISA, Taiji and TianQin, are targeting
to observe milliHz gravitational waves (GWs) in the 2030s. The joint
observations from multiple space-based detectors yield significant advantages.
In this work, we recap the studies and investigations for the joint space-based
GW detector ... | [
{
"created": "Mon, 8 May 2023 08:46:53 GMT",
"version": "v1"
},
{
"created": "Mon, 22 May 2023 09:22:29 GMT",
"version": "v2"
}
] | 2023-05-23 | [
[
"Cai",
"Rong-Gen",
""
],
[
"Guo",
"Zong-Kuan",
""
],
[
"Hu",
"Bin",
""
],
[
"Liu",
"Chang",
""
],
[
"Lu",
"Youjun",
""
],
[
"Ni",
"Wei-Tou",
""
],
[
"Ruan",
"Wen-Hong",
""
],
[
"Seto",
"Naoki",
... | The space-based laser interferometers, LISA, Taiji and TianQin, are targeting to observe milliHz gravitational waves (GWs) in the 2030s. The joint observations from multiple space-based detectors yield significant advantages. In this work, we recap the studies and investigations for the joint space-based GW detector ne... |
1608.08684 | Markus P. Mueller | Markus P. Mueller, Sylvain Carrozza, Philipp A Hoehn | Is the local linearity of space-time inherited from the linearity of
probabilities? | 16 pages, 2 figures. Invited contribution to JPA's special issue
"emerging talents". v2: close to published version | J. Phys. A: Math. Theor. 50, 054003 (2017) | 10.1088/1751-8121/aa523b | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The appearance of linear spaces, describing physical quantities by vectors
and tensors, is ubiquitous in all of physics, from classical mechanics to the
modern notion of local Lorentz invariance. However, as natural as this seems to
the physicist, most computer scientists would argue that something like a
"local line... | [
{
"created": "Tue, 30 Aug 2016 23:02:00 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Jan 2017 13:28:38 GMT",
"version": "v2"
}
] | 2017-02-01 | [
[
"Mueller",
"Markus P.",
""
],
[
"Carrozza",
"Sylvain",
""
],
[
"Hoehn",
"Philipp A",
""
]
] | The appearance of linear spaces, describing physical quantities by vectors and tensors, is ubiquitous in all of physics, from classical mechanics to the modern notion of local Lorentz invariance. However, as natural as this seems to the physicist, most computer scientists would argue that something like a "local linear... |
2305.10939 | Helmut Friedrich | Helmut Friedrich | Cosmological Einstein-Lambda-perfect-fluid solutions with asymptotic
dust or radiation equation of state | 19 pages | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | This article introduces the notions of asymptotic dust and asymptotic
radiation equations of state. With these non-linear generalizations of the well
known dust or (incoherent) radiation equations of state the perfect-fluid
equations loose any conformal covariance or privilege. We analyse the conformal
field equation... | [
{
"created": "Thu, 18 May 2023 12:57:52 GMT",
"version": "v1"
}
] | 2023-05-19 | [
[
"Friedrich",
"Helmut",
""
]
] | This article introduces the notions of asymptotic dust and asymptotic radiation equations of state. With these non-linear generalizations of the well known dust or (incoherent) radiation equations of state the perfect-fluid equations loose any conformal covariance or privilege. We analyse the conformal field equations ... |
1111.5378 | Alexandre Le Tiec | Alexandre Le Tiec, Luc Blanchet, Bernard F. Whiting | The First Law of Binary Black Hole Mechanics in General Relativity and
Post-Newtonian Theory | 43 pages, 3 figures; matches the published version | Phys.Rev.D85:064039,2012 | 10.1103/PhysRevD.85.064039 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | First laws of black hole mechanics, or thermodynamics, come in a variety of
different forms. In this paper, from a purely post-Newtonian (PN) analysis, we
obtain a first law for binary systems of point masses moving along an exactly
circular orbit. Our calculation is valid through 3PN order and includes, in
addition,... | [
{
"created": "Wed, 23 Nov 2011 00:40:24 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Apr 2012 18:26:08 GMT",
"version": "v2"
}
] | 2013-08-26 | [
[
"Tiec",
"Alexandre Le",
""
],
[
"Blanchet",
"Luc",
""
],
[
"Whiting",
"Bernard F.",
""
]
] | First laws of black hole mechanics, or thermodynamics, come in a variety of different forms. In this paper, from a purely post-Newtonian (PN) analysis, we obtain a first law for binary systems of point masses moving along an exactly circular orbit. Our calculation is valid through 3PN order and includes, in addition, t... |
1509.07767 | Igor Pikovski | Igor Pikovski, Magdalena Zych, Fabio Costa, \v{C}aslav Brukner | Brief reply to "Can gravity account for the emergence of classicality?" | 1 page | null | null | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a series of comments, Bonder et al. criticized our work on decoherence due
to time dilation [Nature Physics 11, 668-672 (2015)]. First the authors
erroneously claimed that our results contradict the equivalence principle, only
to "resolve" the alleged conflict in a second note. The resolution - relativity
of simul... | [
{
"created": "Thu, 24 Sep 2015 15:29:59 GMT",
"version": "v1"
}
] | 2015-09-28 | [
[
"Pikovski",
"Igor",
""
],
[
"Zych",
"Magdalena",
""
],
[
"Costa",
"Fabio",
""
],
[
"Brukner",
"Časlav",
""
]
] | In a series of comments, Bonder et al. criticized our work on decoherence due to time dilation [Nature Physics 11, 668-672 (2015)]. First the authors erroneously claimed that our results contradict the equivalence principle, only to "resolve" the alleged conflict in a second note. The resolution - relativity of simulta... |
2302.14722 | Haroldo Cilas Duarte Lima Junior | Zeus S. Moreira, Haroldo C. D. Lima Junior, Lu\'is C. B. Crispino and
Carlos A. R. Herdeiro | Quasinormal modes of a holonomy corrected Schwarzschild black hole | 12 pages, 7 figures | null | 10.1103/PhysRevD.107.104016 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We analyze the quasinormal modes (QNMs) of a recently obtained solution of a
Schwarzschild black hole (BH) with corrections motivated by Loop Quantum
Gravity (LQG). This spacetime is regular everywhere and presents the global
structure of a wormhole, with a minimal surface whose radius depends on a LQG
parameter. We ... | [
{
"created": "Tue, 28 Feb 2023 16:32:32 GMT",
"version": "v1"
}
] | 2023-05-17 | [
[
"Moreira",
"Zeus S.",
""
],
[
"Junior",
"Haroldo C. D. Lima",
""
],
[
"Crispino",
"Luís C. B.",
""
],
[
"Herdeiro",
"Carlos A. R.",
""
]
] | We analyze the quasinormal modes (QNMs) of a recently obtained solution of a Schwarzschild black hole (BH) with corrections motivated by Loop Quantum Gravity (LQG). This spacetime is regular everywhere and presents the global structure of a wormhole, with a minimal surface whose radius depends on a LQG parameter. We fo... |
gr-qc/9508023 | James B. Hartle | James B. Hartle (University of California, Santa Barbara) | Quantum Mechanics at the Planck Scale | 17pages, macros included in tex file | null | null | UCSBTH-95-4 | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Usual quantum mechanics requires a fixed, background, spacetime geometry and
its associated causal structure. A generalization of the usual theory may
therefore be needed at the Planck scale for quantum theories of gravity in
which spacetime geometry is a quantum variable. The elements of generalized
quantum theory a... | [
{
"created": "Tue, 8 Aug 1995 21:04:11 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Dec 2013 04:24:44 GMT",
"version": "v2"
}
] | 2013-12-05 | [
[
"Hartle",
"James B.",
"",
"University of California, Santa Barbara"
]
] | Usual quantum mechanics requires a fixed, background, spacetime geometry and its associated causal structure. A generalization of the usual theory may therefore be needed at the Planck scale for quantum theories of gravity in which spacetime geometry is a quantum variable. The elements of generalized quantum theory are... |
1003.2373 | Alan Coley | Alan Coley, Sigbjorn Hervik, and Nicos Pelavas | Lorentzian manifolds and scalar curvature invariants | submitted to CQG | Class.Quant.Grav.27:102001,2010 | 10.1088/0264-9381/27/10/102001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss (arbitrary-dimensional) Lorentzian manifolds and the scalar
polynomial curvature invariants constructed from the Riemann tensor and its
covariant derivatives. Recently, we have shown that in four dimensions a
Lorentzian spacetime metric is either $\mathcal{I}$-non-degenerate, and hence
locally characterize... | [
{
"created": "Thu, 11 Mar 2010 17:50:54 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Coley",
"Alan",
""
],
[
"Hervik",
"Sigbjorn",
""
],
[
"Pelavas",
"Nicos",
""
]
] | We discuss (arbitrary-dimensional) Lorentzian manifolds and the scalar polynomial curvature invariants constructed from the Riemann tensor and its covariant derivatives. Recently, we have shown that in four dimensions a Lorentzian spacetime metric is either $\mathcal{I}$-non-degenerate, and hence locally characterized ... |
1407.3577 | Rituparno Goswami | George F R Ellis, Rituparno Goswami, Aymen I. M. Hamid and Sunil D.
Maharaj | Astrophysical Black Hole horizons in a cosmological context: Nature and
possible consequences on Hawking Radiation | 14 pages, 4 figures, Minor corrections in the text, Matches the
accepted version in Physical Review D | Phys. Rev. D 90, 084013, 2014 | 10.1103/PhysRevD.90.084013 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper considers the nature of apparent horizons for astrophysical black
hole situated in a realistic cosmological context. Using semi-tetrad covariant
methods we study the local evolutions of the boundaries of the trapped region
in the spacetime. For a collapsing massive star immersed in a cosmology with
Cosmic ... | [
{
"created": "Mon, 14 Jul 2014 09:35:29 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Jul 2014 13:05:30 GMT",
"version": "v2"
},
{
"created": "Mon, 29 Sep 2014 14:16:34 GMT",
"version": "v3"
}
] | 2014-11-14 | [
[
"Ellis",
"George F R",
""
],
[
"Goswami",
"Rituparno",
""
],
[
"Hamid",
"Aymen I. M.",
""
],
[
"Maharaj",
"Sunil D.",
""
]
] | This paper considers the nature of apparent horizons for astrophysical black hole situated in a realistic cosmological context. Using semi-tetrad covariant methods we study the local evolutions of the boundaries of the trapped region in the spacetime. For a collapsing massive star immersed in a cosmology with Cosmic Ba... |
gr-qc/0403103 | Chiang-Mei Chen | James M. Nester, Feng-Feng Meng and Chiang-Mei Chen | Quasilocal Center-of-Mass | 4 pages, contribution to the 6th International Conference of
Gravitation and Astrophysics, Seoul, 2003 (revised version) | J.Korean Phys.Soc. 45 (2004) S22-S25 | null | null | gr-qc | null | Gravitating systems have no well-defined local energy-momentum density.
Various quasilocal proposals have been made, however the center-of-mass moment
(COM) has generally been overlooked. Asymptotically flat graviating systems
have 10 total conserved quantities associated with the Poincar{\'e} symmetry at
infinity. I... | [
{
"created": "Thu, 25 Mar 2004 10:33:44 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Apr 2004 10:17:03 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Nester",
"James M.",
""
],
[
"Meng",
"Feng-Feng",
""
],
[
"Chen",
"Chiang-Mei",
""
]
] | Gravitating systems have no well-defined local energy-momentum density. Various quasilocal proposals have been made, however the center-of-mass moment (COM) has generally been overlooked. Asymptotically flat graviating systems have 10 total conserved quantities associated with the Poincar{\'e} symmetry at infinity. In ... |
2304.14771 | Vahideh Memari Rishakani | M.Halilsoy and V.Memari | Generating spacetimes from colliding sources | 9 pages no figures | J. Math. Phys. 65, 022501 (2024) | 10.1063/5.0156292 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Certain well-known spacetimes of general relativity (GR) are generated from
the collision of suitable null-sources coupled with gravitational waves. This
is a classical process underlying the full nonlinearity of GR that may be
considered alternative to the quantum creativity at a large scale.
Schwarzschild, de Sitte... | [
{
"created": "Fri, 28 Apr 2023 11:32:46 GMT",
"version": "v1"
}
] | 2024-02-08 | [
[
"Halilsoy",
"M.",
""
],
[
"Memari",
"V.",
""
]
] | Certain well-known spacetimes of general relativity (GR) are generated from the collision of suitable null-sources coupled with gravitational waves. This is a classical process underlying the full nonlinearity of GR that may be considered alternative to the quantum creativity at a large scale. Schwarzschild, de Sitter,... |
1807.06261 | Claus Kiefer | Claus Kiefer, Nick Kwidzinski, W{\l}odzimierz Piechocki | On the dynamics of the general Bianchi IX spacetime near the singularity | 20 pages, 5 figures, minor changes | Eur. Phys. J. C (2018) 78:691 | 10.1140/epjc/s10052-018-6155-8 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the complex dynamics of the general Bianchi IX universe in the
vicinity of the spacelike singularity can be approximated by a simplified
system of equations. Our analysis is mainly based on numerical simulations. The
properties of the solution space can be studied by using this simplified
dynamics. Our r... | [
{
"created": "Tue, 17 Jul 2018 07:28:15 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Sep 2018 10:09:49 GMT",
"version": "v2"
}
] | 2018-09-06 | [
[
"Kiefer",
"Claus",
""
],
[
"Kwidzinski",
"Nick",
""
],
[
"Piechocki",
"Włodzimierz",
""
]
] | We show that the complex dynamics of the general Bianchi IX universe in the vicinity of the spacelike singularity can be approximated by a simplified system of equations. Our analysis is mainly based on numerical simulations. The properties of the solution space can be studied by using this simplified dynamics. Our res... |
1309.4368 | Andrzej Krasi\'nski | Andrzej Krasi\'nski | Accelerating expansion or inhomogeneity? A comparison of the
$\Lambda$CDM and Lema\^{\i}tre - Tolman models | LaTex, 21 pages, 17 figures. Includes small corrections suggested by
the referee. This version matches the published text, except for the caption
to Fig. 7, which is corrected here | Phys. Rev. D 89, 023520 (2014) | 10.1103/PhysRevD.89.023520 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown how certain observations interpreted in the background of the
Friedmann model with $\Lambda < 0 = k$ (the $\Lambda$CDM model) can be
re-interpreted using the $\Lambda = 0$ Lema\^{\i}tre - Tolman (L-T) model so as
to do away with the "dark energy". The purpose of the paper is to clarify the
underlying geom... | [
{
"created": "Tue, 17 Sep 2013 16:15:33 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Mar 2014 15:27:41 GMT",
"version": "v2"
}
] | 2014-03-20 | [
[
"Krasiński",
"Andrzej",
""
]
] | It is shown how certain observations interpreted in the background of the Friedmann model with $\Lambda < 0 = k$ (the $\Lambda$CDM model) can be re-interpreted using the $\Lambda = 0$ Lema\^{\i}tre - Tolman (L-T) model so as to do away with the "dark energy". The purpose of the paper is to clarify the underlying geomet... |
1202.5373 | Jose Edgar Madriz Aguilar | Reyes Luz Marina, Moreno Claudia, Madriz Aguilar Jose Edgar | On gravitational waves generated during inflation under the influence of
a dynamical cosmological "constant" | 5 pages, no figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study cosmological gravitational waves generated during inflation under
the influence of a decaying cosmological "constant", in the
Transverse-Traceless (TT) gauge. In our approach we consider a non-perturbative
contribution of the dynamical cosmological "constant" to the tensor modes. As
an application of the mod... | [
{
"created": "Fri, 24 Feb 2012 05:16:11 GMT",
"version": "v1"
}
] | 2012-02-27 | [
[
"Marina",
"Reyes Luz",
""
],
[
"Claudia",
"Moreno",
""
],
[
"Edgar",
"Madriz Aguilar Jose",
""
]
] | We study cosmological gravitational waves generated during inflation under the influence of a decaying cosmological "constant", in the Transverse-Traceless (TT) gauge. In our approach we consider a non-perturbative contribution of the dynamical cosmological "constant" to the tensor modes. As an application of the model... |
1310.8654 | Edward Wilson-Ewing | Carlo Rovelli, Edward Wilson-Ewing | Why are the effective equations of loop quantum cosmology so accurate? | 6 pages, v2: Clarifications and references added | Phys.Rev.D90:023538,2014 | 10.1103/PhysRevD.90.023538 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We point out that the relative Heisenberg uncertainty relations vanish for
non-compact spaces in homogeneous loop quantum cosmology. As a consequence, for
sharply peaked states quantum fluctuations in the scale factor never become
important, even near the bounce point. This shows why quantum back-reaction
effects rem... | [
{
"created": "Thu, 31 Oct 2013 19:41:38 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Jul 2014 15:53:11 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"Rovelli",
"Carlo",
""
],
[
"Wilson-Ewing",
"Edward",
""
]
] | We point out that the relative Heisenberg uncertainty relations vanish for non-compact spaces in homogeneous loop quantum cosmology. As a consequence, for sharply peaked states quantum fluctuations in the scale factor never become important, even near the bounce point. This shows why quantum back-reaction effects remai... |
1511.02774 | Sudipto Roy | Sudipto Roy | A Study of Transition of the Expansion of the Universe from a Phase of
Deceleration to Acceleration through a Conversion of Matter into Dark Energy
in the Framework of Brans-Dicke Theory | null | International Journal of Science and Research (IJSR), Volume 4,
Issue 11, pages 885-890, 2015 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present study is based on a generalized form of Brans-Dicke (BD) theory
where, the dimensionless BD parameter is regarded as a function of the scalar
field, which is reciprocal of the gravitational constant. The field equations
have been solved by incorporating an empirical function f(t) in the expression
represe... | [
{
"created": "Fri, 6 Nov 2015 09:54:57 GMT",
"version": "v1"
}
] | 2017-11-07 | [
[
"Roy",
"Sudipto",
""
]
] | The present study is based on a generalized form of Brans-Dicke (BD) theory where, the dimensionless BD parameter is regarded as a function of the scalar field, which is reciprocal of the gravitational constant. The field equations have been solved by incorporating an empirical function f(t) in the expression represent... |
2306.03729 | Jose Perdiguero | Oscar Castillo-Felisola, Jose Perdiguero | Does the metric play a fundamental role in the building of gravitational
models? | null | null | 10.1142/S0219887824300010 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The idea that General Relativity could be an effective model, of a yet
unknown theory of gravity, has gained momentum among theoretical physicists.
The polynomial affine model of gravity is an alternative model of affine
gravity that possesses many desirable features to pursue a quantum theory of
gravitation. In this... | [
{
"created": "Tue, 6 Jun 2023 14:47:09 GMT",
"version": "v1"
}
] | 2023-10-26 | [
[
"Castillo-Felisola",
"Oscar",
""
],
[
"Perdiguero",
"Jose",
""
]
] | The idea that General Relativity could be an effective model, of a yet unknown theory of gravity, has gained momentum among theoretical physicists. The polynomial affine model of gravity is an alternative model of affine gravity that possesses many desirable features to pursue a quantum theory of gravitation. In this p... |
gr-qc/0108085 | Ulf Leonhardt | U. Leonhardt | A Primer to Slow Light | Contribution to the book Artificial Black Holes edited by Mario
Novello, Matt Visser and Grigori Volovik | null | null | null | gr-qc | null | Laboratory-based optical analogs of astronomical objects such as black holes
rely on the creation of light with an extremely low or even vanishing group
velocity (slow light). These brief notes represent a pedagogical attempt
towards elucidating this extraordinary form of light. This paper is a
contribution to the bo... | [
{
"created": "Fri, 31 Aug 2001 10:15:09 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Jan 2002 15:52:41 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Leonhardt",
"U.",
""
]
] | Laboratory-based optical analogs of astronomical objects such as black holes rely on the creation of light with an extremely low or even vanishing group velocity (slow light). These brief notes represent a pedagogical attempt towards elucidating this extraordinary form of light. This paper is a contribution to the book... |
2404.13538 | Pramit Rej | Pramit Rej | Charged analog of anisotropic dark energy star in Rastall gravity | 17 pages, 11 figures, 1 table. Prepared and submitted to EPJC on
08.04.2024 | null | null | null | gr-qc astro-ph.CO astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dark energy is one of the potential strategies for preventing compact objects
from gravitationally collapsing into singularities. Because it is the cause of
the accelerated expansion of our universe, it has the greatest impact on the
cosmos. Thus, it is plausible that dark energy will interact with any stellar
object... | [
{
"created": "Sun, 21 Apr 2024 05:24:54 GMT",
"version": "v1"
}
] | 2024-04-23 | [
[
"Rej",
"Pramit",
""
]
] | Dark energy is one of the potential strategies for preventing compact objects from gravitationally collapsing into singularities. Because it is the cause of the accelerated expansion of our universe, it has the greatest impact on the cosmos. Thus, it is plausible that dark energy will interact with any stellar object t... |
0810.5241 | Luca Lusanna | Luca Lusanna | Relativistic Atomic Physics: from Atomic Clock Synchronization towards
Relativistic Entanglement | Talk given at the 7th Friedmann International Seminar, Joao Pessoa
(Brasil), June 29 - July 5, 2008 | Int.J.Mod.Phys.A24:1518-1527,2009 | 10.1142/S0217751X09044929 | null | gr-qc astro-ph hep-th physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A review is given of the implications of the absence of an intrinsic notion
of instantaneous 3-space, so that a clock synchronization convention has to be
introduced, for relativistic theories.
| [
{
"created": "Wed, 29 Oct 2008 10:58:37 GMT",
"version": "v1"
}
] | 2009-04-24 | [
[
"Lusanna",
"Luca",
""
]
] | A review is given of the implications of the absence of an intrinsic notion of instantaneous 3-space, so that a clock synchronization convention has to be introduced, for relativistic theories. |
gr-qc/9402029 | Socorro | J.A. Nieto, O. Obreg\'on and J. Socorro | The Gauge Theory of the de-Sitter Group and Ashtekar Formulation | 9 pages | Phys.Rev.D50:3583-3586,1994 | 10.1103/PhysRevD.50.R3583 | IFUG-94-001 | gr-qc | null | By adding the Pontrjagin topological invariant to the gauge theory of the de
Sitter group proposed by MacDowell and Mansouri we obtain an action quadratic
in the field-strengths, of the Chern-Simons type, from which the Ashtekar
formulation is derived.
| [
{
"created": "Tue, 22 Feb 1994 18:13:41 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Feb 1994 22:38:56 GMT",
"version": "v2"
}
] | 2010-01-06 | [
[
"Nieto",
"J. A.",
""
],
[
"Obregón",
"O.",
""
],
[
"Socorro",
"J.",
""
]
] | By adding the Pontrjagin topological invariant to the gauge theory of the de Sitter group proposed by MacDowell and Mansouri we obtain an action quadratic in the field-strengths, of the Chern-Simons type, from which the Ashtekar formulation is derived. |
1006.1763 | Thomas Sotiriou | Ted Jacobson and Thomas P. Sotiriou | Might black holes reveal their inner secrets? | Essay written for FQXi essay competition "What is Ultimately Possible
in Physics", Third Prize Winner (based on Phys. Rev. Lett. 103, 141101
(2009), arXiv:0907.4146 [gr-qc]) | null | null | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black holes harbor a spacetime singularity of infinite curvature, where
classical spacetime physics breaks down, and current theory cannot predict what
will happen. However, the singularity is invisible from the outside because
strong gravity traps all signals, even light, behind an event horizon. In this
essay we di... | [
{
"created": "Wed, 9 Jun 2010 10:52:37 GMT",
"version": "v1"
}
] | 2010-06-10 | [
[
"Jacobson",
"Ted",
""
],
[
"Sotiriou",
"Thomas P.",
""
]
] | Black holes harbor a spacetime singularity of infinite curvature, where classical spacetime physics breaks down, and current theory cannot predict what will happen. However, the singularity is invisible from the outside because strong gravity traps all signals, even light, behind an event horizon. In this essay we disc... |
1302.1191 | Muhammad Sharif | M. Sharif and Sadia Arif | Static Cylindrically Symmetric Interior Solutions in f(R) Gravity | 10 pages, no figure | Mod. Phys. Lett. A. 27(2012)1250138 | 10.1142/S0217732312501386 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate some exact static cylindrically symmetric solutions for a
perfect fluid in the metric $f(R)$ theory of gravity. For this purpose, three
different families of solutions are explored. We evaluate energy density,
pressure, Ricci scalar and functional form of $f(R)$. It is interesting to
mention here that ... | [
{
"created": "Sat, 26 Jan 2013 04:55:01 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Sharif",
"M.",
""
],
[
"Arif",
"Sadia",
""
]
] | We investigate some exact static cylindrically symmetric solutions for a perfect fluid in the metric $f(R)$ theory of gravity. For this purpose, three different families of solutions are explored. We evaluate energy density, pressure, Ricci scalar and functional form of $f(R)$. It is interesting to mention here that tw... |
gr-qc/9608058 | Mauricio O. Calvao | M. L. Bedran, M. O. Calvao, I. Damiao Soares and F. M. Paiva | Taub's plane-symmetric vacuum spacetime revisited | plain LaTex, four Postscript figures | Phys.Rev. D55 (1997) 3431-3439 | 10.1103/PhysRevD.55.3431 | null | gr-qc | null | The gravitational properties of the {\em only} static plane-symmetric vacuum
solution of Einstein's field equations without cosmological term (Taub's
solution, for brevity) are presented: some already known properties (geodesics,
weak field limit and pertainment to the Schwarzschild family of spacetimes) are
reviewed... | [
{
"created": "Fri, 23 Aug 1996 22:01:24 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Bedran",
"M. L.",
""
],
[
"Calvao",
"M. O.",
""
],
[
"Soares",
"I. Damiao",
""
],
[
"Paiva",
"F. M.",
""
]
] | The gravitational properties of the {\em only} static plane-symmetric vacuum solution of Einstein's field equations without cosmological term (Taub's solution, for brevity) are presented: some already known properties (geodesics, weak field limit and pertainment to the Schwarzschild family of spacetimes) are reviewed i... |
gr-qc/0109020 | Dr A. R. Prasanna | A. R. Prasanna | Inertial Forces as Viewed from the ADM Slicing and their behaviour for
Particles in Non-Circular Geodesics | 16 Latex pages, 1 Table and 3 Figures | null | 10.1142/S0217732302008277 | null | gr-qc astro-ph | null | Considering the definition of inertial forces acting on a test particle,
following non-circular geodesics, in static and stationary space times we show
that the centrifugal force reversal occurs only in the case of particles
following prograde orbits around black holes. We first rewrite the covariant
expressions for ... | [
{
"created": "Thu, 6 Sep 2001 13:56:16 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Mar 2002 04:05:28 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Prasanna",
"A. R.",
""
]
] | Considering the definition of inertial forces acting on a test particle, following non-circular geodesics, in static and stationary space times we show that the centrifugal force reversal occurs only in the case of particles following prograde orbits around black holes. We first rewrite the covariant expressions for th... |
1412.4256 | Spyridon Talaganis | Tirthabir Biswas, Spyridon Talaganis | String-Inspired Infinite-Derivative Theories of Gravity: A Brief
Overview | 22 pages. Accepted review article in "New trends in theory of
gravity," Mod. Phys. Lett. A, v2: very minor changes | Mod. Phys. Lett. A, Vol. 30, Nos. 3 & 4 (2015) 1540009 | 10.1142/S021773231540009X | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In String Theory there often appears a rather interesting class of higher
derivative theories containing an infinite set of derivatives in the form of an
exponential. These theories may provide a way to tame ultraviolet divergences
without introducing ghost-like states. In this invited article we provide a
brief over... | [
{
"created": "Sat, 13 Dec 2014 17:03:19 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jan 2015 11:48:23 GMT",
"version": "v2"
}
] | 2015-02-23 | [
[
"Biswas",
"Tirthabir",
""
],
[
"Talaganis",
"Spyridon",
""
]
] | In String Theory there often appears a rather interesting class of higher derivative theories containing an infinite set of derivatives in the form of an exponential. These theories may provide a way to tame ultraviolet divergences without introducing ghost-like states. In this invited article we provide a brief overvi... |
1906.10090 | Claudio Coriano | Claudio Corian\`o, Paul H. Frampton | Holographic Principle, Cosmological Constant and Cyclic Cosmology | 10 pages, version published in Mod. Phys. Lett. A34, 1950355 (2019) | null | 10.1142/S0217732319503553 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The holographic principle provides a deep insight into quantum gravity and
resolves the fine-tuning crisis concerning the cosmological constant.
Holographic dark energy introduces new ultra-violet (UV) and infra-red (IR)
cutoffs into quantum gravity which are necessarily strongly related. The
equation of state for da... | [
{
"created": "Mon, 24 Jun 2019 17:15:08 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Nov 2019 09:16:14 GMT",
"version": "v2"
}
] | 2020-02-19 | [
[
"Corianò",
"Claudio",
""
],
[
"Frampton",
"Paul H.",
""
]
] | The holographic principle provides a deep insight into quantum gravity and resolves the fine-tuning crisis concerning the cosmological constant. Holographic dark energy introduces new ultra-violet (UV) and infra-red (IR) cutoffs into quantum gravity which are necessarily strongly related. The equation of state for dark... |
2201.03783 | Bivudutta Mishra Dr. | A.S. Agrawal, S.K. Tripathy, Sarmistha Pal, B.Mishra | Role of Extended Gravity Theory in Matter Bounce Dynamics | 17 pages, 22 figures, Accepted version Physica Scripta | Physica Scripta, 97, 025002, 2022 | 10.1088/1402-4896/ac49b2 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we have studied some bouncing cosmologies in the frame work of
$f(R,T)$ gravity. The bouncing scenario has been formulated to avoid the big
bang singularity. The physical and geometrical parameters are investigated. The
effect of the extended gravity theory on the dynamical parameters of the model
is in... | [
{
"created": "Tue, 11 Jan 2022 05:05:35 GMT",
"version": "v1"
}
] | 2022-04-22 | [
[
"Agrawal",
"A. S.",
""
],
[
"Tripathy",
"S. K.",
""
],
[
"Pal",
"Sarmistha",
""
],
[
"Mishra",
"B.",
""
]
] | In this work, we have studied some bouncing cosmologies in the frame work of $f(R,T)$ gravity. The bouncing scenario has been formulated to avoid the big bang singularity. The physical and geometrical parameters are investigated. The effect of the extended gravity theory on the dynamical parameters of the model is inve... |
2310.15185 | Ali Mahmoodzadeh | A. Mahmoodzadeh, B. Malakolkalami, K. Ghaderi | Real particle geodesics and thermodynamics of a black hole in Regular
Schwarzschild-Anti de Sitter space-time | 22 pages, 26 figures | null | null | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | In this work, we illustrate the geodesics of real particles obtained
numerically in a Regular Schwarzschild Anti-de Sitter (RSch-AdS) space-time.
The behavior of these geodesics are considered depending on variation of
effective parameters such as mass distribution, angular momentum and
cosmological constant. Also, u... | [
{
"created": "Fri, 20 Oct 2023 18:03:41 GMT",
"version": "v1"
}
] | 2023-10-25 | [
[
"Mahmoodzadeh",
"A.",
""
],
[
"Malakolkalami",
"B.",
""
],
[
"Ghaderi",
"K.",
""
]
] | In this work, we illustrate the geodesics of real particles obtained numerically in a Regular Schwarzschild Anti-de Sitter (RSch-AdS) space-time. The behavior of these geodesics are considered depending on variation of effective parameters such as mass distribution, angular momentum and cosmological constant. Also, usi... |
gr-qc/0406019 | Sergei A. Klioner | Sergei A. Klioner | Independent Components of an Indexed Object with Linear Symmetries | 9 pages, Proceedings of the CASC'2004 (Computer Algebra in Scienfic
Computing) | null | null | null | gr-qc | null | The problem of finding independent components of an indexed object (e.g., a
tensor) with arbitrary number of indices and arbitrary linear symmetries is
discussed. It is proved that the number of independent components $f(k)$ is a
polynomial of degree not greater than the number of indices $n$, $k$ being the
dimension... | [
{
"created": "Fri, 4 Jun 2004 18:27:33 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Jun 2004 17:31:55 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Klioner",
"Sergei A.",
""
]
] | The problem of finding independent components of an indexed object (e.g., a tensor) with arbitrary number of indices and arbitrary linear symmetries is discussed. It is proved that the number of independent components $f(k)$ is a polynomial of degree not greater than the number of indices $n$, $k$ being the dimension o... |
gr-qc/9211008 | null | David Hochberg and Thomas W. Kephart | Gauge Field Back-reaction on a Black Hole | 17 pages, three figures available on request, in RevTex | Phys.Rev. D47 (1993) 1465-1470 | 10.1103/PhysRevD.47.1465 | VAND-TH-92-3 | gr-qc astro-ph | null | The order $\hbar$ fluctuations of gauge fields in the vicinity of a blackhole
can create a repulsive antigravity region extending out beyond the renormalized
Schwarzschild horizon. If the strength of this repulsive force increases as
higher orders in the back-reaction are included, the formation of a
wormhole-like ob... | [
{
"created": "Thu, 5 Nov 1992 16:59:25 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Hochberg",
"David",
""
],
[
"Kephart",
"Thomas W.",
""
]
] | The order $\hbar$ fluctuations of gauge fields in the vicinity of a blackhole can create a repulsive antigravity region extending out beyond the renormalized Schwarzschild horizon. If the strength of this repulsive force increases as higher orders in the back-reaction are included, the formation of a wormhole-like obje... |
2306.01868 | Qi-Xin Xie | He-Yu Gao, Paul M. Saffin, Yi-Jie Wang, Qi-Xin Xie, Shuang-Yong Zhou | Boson Star Superradiance | 10 pages, 6 figures; v2: refs added and clarified | null | null | USTC-ICTS/PCFT-23-16 | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, it has been realized that in some systems internal space rotation
can induce energy amplification for scattering waves, similar to rotation in
real space. Particularly, it has been shown that energy extraction is possible
for a Q-ball, a stationary non-topological soliton that is coherently rotating
in its ... | [
{
"created": "Fri, 2 Jun 2023 18:53:23 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Jun 2023 05:06:43 GMT",
"version": "v2"
}
] | 2023-06-30 | [
[
"Gao",
"He-Yu",
""
],
[
"Saffin",
"Paul M.",
""
],
[
"Wang",
"Yi-Jie",
""
],
[
"Xie",
"Qi-Xin",
""
],
[
"Zhou",
"Shuang-Yong",
""
]
] | Recently, it has been realized that in some systems internal space rotation can induce energy amplification for scattering waves, similar to rotation in real space. Particularly, it has been shown that energy extraction is possible for a Q-ball, a stationary non-topological soliton that is coherently rotating in its fi... |
1405.7883 | Lau Loi So | Lau Loi So | The modification of the Bel-Robinson type energy-momentum | 7 pages, a major revision of arXiv:1302.2412 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For describing the non-negative gravitational energy-momentum in terms of a
pure Bel-Robinson type energy-momentum in a quasi-local 2-surface, both the
Bel-Robinson tensor $B$ and tensor $V$ are suitable. We have found that this
Bel-Robinson type energy-momentum can be modified such that it satisfies the
Lorentz cova... | [
{
"created": "Fri, 30 May 2014 14:58:36 GMT",
"version": "v1"
}
] | 2014-06-02 | [
[
"So",
"Lau Loi",
""
]
] | For describing the non-negative gravitational energy-momentum in terms of a pure Bel-Robinson type energy-momentum in a quasi-local 2-surface, both the Bel-Robinson tensor $B$ and tensor $V$ are suitable. We have found that this Bel-Robinson type energy-momentum can be modified such that it satisfies the Lorentz covari... |
2105.09173 | Benrong Mu | Rui Yin, Jing Liang, Benrong Mu | Joule-Thomson expansion of Reissner-Nordstr\"om-Anti-de Sitter black
holes with cloud of strings and quintessence | 36 pages, 8 figures, 5 tables | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Joule-Thomson expansion is studied for Reissner-Nordstr\"om-Anti-de
Sitter black holes with cloud of strings and quintessence, as well as its
thermodynamics. The cosmological constant is treated as thermodynamic pressure,
whose conjugate variable is considered as the volume. The characteristics of
the Joule-Thoms... | [
{
"created": "Wed, 19 May 2021 14:44:44 GMT",
"version": "v1"
}
] | 2021-05-20 | [
[
"Yin",
"Rui",
""
],
[
"Liang",
"Jing",
""
],
[
"Mu",
"Benrong",
""
]
] | The Joule-Thomson expansion is studied for Reissner-Nordstr\"om-Anti-de Sitter black holes with cloud of strings and quintessence, as well as its thermodynamics. The cosmological constant is treated as thermodynamic pressure, whose conjugate variable is considered as the volume. The characteristics of the Joule-Thomson... |
1706.10244 | Bijunath Patla | Neil Ashby, Thomas E. Parker, Bijunath R. Patla | A null test of General Relativity: New limits on Local Position
Invariance and the variation of fundamental constants | null | null | null | null | gr-qc physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compare the long-term fractional frequency variation of four hydrogen
masers that are part of an ensemble of clocks comprising the National Institute
of Standards and Technology,(NIST), Boulder, timescale with the fractional
frequencies of primary frequency standards operated by leading metrology
laboratories in t... | [
{
"created": "Fri, 30 Jun 2017 15:41:58 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Dec 2017 21:34:43 GMT",
"version": "v2"
},
{
"created": "Tue, 20 Feb 2018 17:10:01 GMT",
"version": "v3"
}
] | 2018-02-21 | [
[
"Ashby",
"Neil",
""
],
[
"Parker",
"Thomas E.",
""
],
[
"Patla",
"Bijunath R.",
""
]
] | We compare the long-term fractional frequency variation of four hydrogen masers that are part of an ensemble of clocks comprising the National Institute of Standards and Technology,(NIST), Boulder, timescale with the fractional frequencies of primary frequency standards operated by leading metrology laboratories in the... |
gr-qc/0301043 | Grigori Volovik | G.E. Volovik | What can the quantum liquid say on the brane black hole, the entropy of
extremal black hole and the vacuum energy? | LaTeX file, 23 pages, 2 Figures, prepared for issue of Foundations of
Physics devoted to the honor of Jacob Bekenstein; misprints are corrected | Found.Phys. 33 (2003) 349-368 | 10.1023/A:1023762013553 | null | gr-qc cond-mat hep-ph | null | Using quantum liquids one can simulate the behavior of the quantum vacuum in
the presence of the event horizon. The condensed matter analogs demonstrate
that in most cases the quantum vacuum resists to formation of the horizon, and
even if the horizon is formed different types of the vacuum instability
develop, which... | [
{
"created": "Mon, 13 Jan 2003 09:10:53 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Jan 2003 14:08:56 GMT",
"version": "v2"
}
] | 2022-10-12 | [
[
"Volovik",
"G. E.",
""
]
] | Using quantum liquids one can simulate the behavior of the quantum vacuum in the presence of the event horizon. The condensed matter analogs demonstrate that in most cases the quantum vacuum resists to formation of the horizon, and even if the horizon is formed different types of the vacuum instability develop, which a... |
gr-qc/9806047 | Luis J. Garay | Luis J. Garay | Thermal properties of spacetime foam | RevTeX 3.01, 11 pages, no figures | Phys. Rev. D 58, 124015 (1998) | 10.1103/PhysRevD.58.124015 | null | gr-qc quant-ph | null | Spacetime foam can be modeled in terms of nonlocal effective interactions in
a classical nonfluctuating background. Then, the density matrix for the
low-energy fields evolves, in the weak-coupling approximation, according to a
master equation that contains a diffusion term. Furthermore, it is argued that
spacetime fo... | [
{
"created": "Tue, 9 Jun 1998 15:20:13 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Mar 1999 10:45:24 GMT",
"version": "v2"
}
] | 2016-08-25 | [
[
"Garay",
"Luis J.",
""
]
] | Spacetime foam can be modeled in terms of nonlocal effective interactions in a classical nonfluctuating background. Then, the density matrix for the low-energy fields evolves, in the weak-coupling approximation, according to a master equation that contains a diffusion term. Furthermore, it is argued that spacetime foam... |
1201.0475 | Nikolaos Pappas | Nikolaos D. Pappas | On the preservation of unitarity during black hole evolution and
information extraction from its interior | 8 pages, no figures | Mod. Phys. Lett. A, v27, iss19, pp12501,2012 | 10.1142/S021773231250109X | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For more than 30 years the discovery that black holes radiate like black
bodies of specific temperature has triggered a multitude of puzzling questions
concerning their nature and the fate of information that goes down the black
hole during its lifetime. The most tricky issue in what is known as information
loss para... | [
{
"created": "Mon, 2 Jan 2012 14:41:19 GMT",
"version": "v1"
},
{
"created": "Tue, 22 May 2012 14:41:15 GMT",
"version": "v2"
}
] | 2012-06-28 | [
[
"Pappas",
"Nikolaos D.",
""
]
] | For more than 30 years the discovery that black holes radiate like black bodies of specific temperature has triggered a multitude of puzzling questions concerning their nature and the fate of information that goes down the black hole during its lifetime. The most tricky issue in what is known as information loss parado... |
gr-qc/0304109 | Bin Wang | Li-Hui Xue, Zai-Xiong Shen, Bin Wang and Ru-Keng Su | Numerical simulation of Quasi-Normal Modes in time-dependent background | 10 pages, 8 figures; reference added | Mod.Phys.Lett. A19 (2004) 239 | 10.1142/S021773230401240X | null | gr-qc astro-ph hep-th | null | We study the massless scalar wave propagation in the time-dependent
Schwarzschild black hole background. We find that the Kruskal coordinate is an
appropriate framework to investigate the time-dependent spacetime. A
time-dependent scattering potential is derived by considering dynamical black
hole with parameters cha... | [
{
"created": "Wed, 30 Apr 2003 13:48:51 GMT",
"version": "v1"
},
{
"created": "Fri, 2 May 2003 13:21:39 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Xue",
"Li-Hui",
""
],
[
"Shen",
"Zai-Xiong",
""
],
[
"Wang",
"Bin",
""
],
[
"Su",
"Ru-Keng",
""
]
] | We study the massless scalar wave propagation in the time-dependent Schwarzschild black hole background. We find that the Kruskal coordinate is an appropriate framework to investigate the time-dependent spacetime. A time-dependent scattering potential is derived by considering dynamical black hole with parameters chang... |
gr-qc/0204085 | Jerry B. Griffiths | J. B. Griffiths and P. Docherty | A disintegrating cosmic string | 3 pages, 1 figure, to appear in Class. Quantum Grav | Class.Quant.Grav. 19 (2002) L109-L112 | 10.1088/0264-9381/19/11/103 | null | gr-qc | null | We present a simple sandwich gravitational wave of the Robinson-Trautman
family. This is interpreted as representing a shock wave with a spherical
wavefront which propagates into a Minkowski background minus a wedge. (i.e. the
background contains a cosmic string.) The deficit angle (the tension) of the
string decreas... | [
{
"created": "Mon, 29 Apr 2002 10:56:13 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Griffiths",
"J. B.",
""
],
[
"Docherty",
"P.",
""
]
] | We present a simple sandwich gravitational wave of the Robinson-Trautman family. This is interpreted as representing a shock wave with a spherical wavefront which propagates into a Minkowski background minus a wedge. (i.e. the background contains a cosmic string.) The deficit angle (the tension) of the string decreases... |
gr-qc/9904073 | Tomohiro Harada | Tomohiro Harada, Ken-ichi Nakao, and Hideo Iguchi | Nakedness and curvature strength of shell-focusing singularity in the
spherically symmetric space-time with vanishing radial pressure | 11 pages, Accepted for Publication in Classical and Quantum Gravity,
References Updated, Grammatical Errors Corrected | Class.Quant.Grav. 16 (1999) 2785-2796 | 10.1088/0264-9381/16/8/315 | KUNS-1551 | gr-qc astro-ph | null | It was recently shown that the metric functions which describe a spherically
symmetric space-time with vanishing radial pressure can be explicitly
integrated. We investigate the nakedness and curvature strength of the
shell-focusing singularity in that space-time. If the singularity is naked, the
relation between the... | [
{
"created": "Wed, 28 Apr 1999 05:59:58 GMT",
"version": "v1"
},
{
"created": "Thu, 20 May 1999 08:54:36 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Harada",
"Tomohiro",
""
],
[
"Nakao",
"Ken-ichi",
""
],
[
"Iguchi",
"Hideo",
""
]
] | It was recently shown that the metric functions which describe a spherically symmetric space-time with vanishing radial pressure can be explicitly integrated. We investigate the nakedness and curvature strength of the shell-focusing singularity in that space-time. If the singularity is naked, the relation between the c... |
1311.3917 | Ignazio Ciufolini | Beatriz Moreno Monge, Rolf Koenig, Grzegorz Michalak, Ignazio
Ciufolini, Antonio Paolozzi, Giampiero Sindoni | Preliminary study for the measurement of the Lense-Thirring effect with
the Galileo satellites | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The precession of the orbital node of a particle orbiting a rotating mass is
known as Lense-Thirring effect (LTE) and is a manifestation of the general
relativistic phenomenon of dragging of inertial frames or frame-dragging. The
LTE has already been measured by using the node drifts of the LAGEOS satellites
and GRAC... | [
{
"created": "Fri, 15 Nov 2013 16:38:57 GMT",
"version": "v1"
}
] | 2013-11-18 | [
[
"Monge",
"Beatriz Moreno",
""
],
[
"Koenig",
"Rolf",
""
],
[
"Michalak",
"Grzegorz",
""
],
[
"Ciufolini",
"Ignazio",
""
],
[
"Paolozzi",
"Antonio",
""
],
[
"Sindoni",
"Giampiero",
""
]
] | The precession of the orbital node of a particle orbiting a rotating mass is known as Lense-Thirring effect (LTE) and is a manifestation of the general relativistic phenomenon of dragging of inertial frames or frame-dragging. The LTE has already been measured by using the node drifts of the LAGEOS satellites and GRACE-... |
1504.07476 | Nelson Videla Dr. | Ram\'on Herrera, Nelson Videla, and Marco Olivares | Warm intermediate inflation in the Randall-Sundrum II model in the light
of Planck 2015 and BICEP2 results: A general dissipative coefficient | 26 pages, 3 figures, accepted for publication in the European
Physical Journal C | null | 10.1140/epjc/s10052-015-3433-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A warm inflationary Universe in the Randall-Sundrum II model during
intermediate inflation is studied. For this purpose, we consider a general form
for the dissipative coefficient
$\Gamma(T,\phi)=C_{\phi}\,\frac{T^{m}}{\phi^{m-1}}$, and also analyze this
inflationary model in the weak and strong dissipative regimes. ... | [
{
"created": "Tue, 28 Apr 2015 13:58:08 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Herrera",
"Ramón",
""
],
[
"Videla",
"Nelson",
""
],
[
"Olivares",
"Marco",
""
]
] | A warm inflationary Universe in the Randall-Sundrum II model during intermediate inflation is studied. For this purpose, we consider a general form for the dissipative coefficient $\Gamma(T,\phi)=C_{\phi}\,\frac{T^{m}}{\phi^{m-1}}$, and also analyze this inflationary model in the weak and strong dissipative regimes. We... |
1012.0644 | Jiliang Jing | Jiliang Jing, Liancheng Wang, Qiyuan Pan, Songbai Chen | Holographic Superconductors in Gauss-Bonnet gravity with Born-Infeld
electrodynamics | 11 pages, 2 figures, 2 tables | Phys.Rev.D83:066010,2011 | 10.1103/PhysRevD.83.066010 | null | gr-qc cond-mat.supr-con hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the holographic superconductors in Gauss-Bonnet gravity with
Born-Infeld electrodynamics. We find that the Gauss-Bonnet constant, the model
parameters and the Born-Infeld coupling parameter will affect the formation of
the scalar hair, the transition point of the phase transition from the second
order ... | [
{
"created": "Fri, 3 Dec 2010 06:27:32 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Mar 2011 15:17:44 GMT",
"version": "v2"
}
] | 2011-03-22 | [
[
"Jing",
"Jiliang",
""
],
[
"Wang",
"Liancheng",
""
],
[
"Pan",
"Qiyuan",
""
],
[
"Chen",
"Songbai",
""
]
] | We investigate the holographic superconductors in Gauss-Bonnet gravity with Born-Infeld electrodynamics. We find that the Gauss-Bonnet constant, the model parameters and the Born-Infeld coupling parameter will affect the formation of the scalar hair, the transition point of the phase transition from the second order to... |
2306.10487 | Saddam Hussain | Saddam Hussain, Saikat Chakraborty, Nandan Roy, and Kaushik
Bhattacharya | Dynamical Analysis of the Dirac-Born-Infeld type of Tachyon field
minimally coupled with barotropic fluid using EOS parametrization of a field | 5 Pages, 2 figures, Conference proceeding for XXV DAE-BRNS HEP
Symposium 2022 | null | null | null | gr-qc hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this paper, we present a dynamical system analysis of the tachyon dark
energy model by parametrization of the equation of state (EoS) of the dark
energy. The choice of parametrization can constrain the form of the field
potential, and as a result, the theory can be directly constrained from the
observation without... | [
{
"created": "Sun, 18 Jun 2023 06:40:21 GMT",
"version": "v1"
}
] | 2023-06-21 | [
[
"Hussain",
"Saddam",
""
],
[
"Chakraborty",
"Saikat",
""
],
[
"Roy",
"Nandan",
""
],
[
"Bhattacharya",
"Kaushik",
""
]
] | In this paper, we present a dynamical system analysis of the tachyon dark energy model by parametrization of the equation of state (EoS) of the dark energy. The choice of parametrization can constrain the form of the field potential, and as a result, the theory can be directly constrained from the observation without a... |
2110.00975 | Winfried Zimdahl | Winfried Zimdahl | On the mode structure of imperfect fluids | 11 pages | Cadernos De Astronomia 3 (1) (2022) | 10.47456/Cad.Astro.v3n1.3685. | null | gr-qc astro-ph.CO physics.flu-dyn | http://creativecommons.org/licenses/by/4.0/ | This paper tries to obtain a simple picture of several aspects of the mode
structure in relativistic non-equilibrium thermodynamics. Its pedagogical focus
is on the relation between long-wavelength perturbation modes of the causal
M\"{u}ller-Israel-Stewart (MIS) theory and those of the traditional Eckart
theory. Prin... | [
{
"created": "Sun, 3 Oct 2021 10:41:31 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Feb 2022 09:49:56 GMT",
"version": "v2"
}
] | 2022-02-25 | [
[
"Zimdahl",
"Winfried",
""
]
] | This paper tries to obtain a simple picture of several aspects of the mode structure in relativistic non-equilibrium thermodynamics. Its pedagogical focus is on the relation between long-wavelength perturbation modes of the causal M\"{u}ller-Israel-Stewart (MIS) theory and those of the traditional Eckart theory. Princi... |
2402.14038 | Gholam Hossein Bordbar | Gholam Hossein Bordbar, Mohammad Mazhari and Ahmad Poostforush | Isotropic and anisotropic neutron star structure in 4D Einstein Gauss
Bonnet Gravity | 7 figures and 5 tables | European Physical Journal Plus 139 (2024) 167 | 10.1140/epjp/s13360-024-04959-w | null | gr-qc astro-ph.HE hep-th nucl-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | With regard to the coupling constant and the strong magnetic field of neutron
stars, we have studied these stars in the 4D Einstein Gauss Bonnet (4D EGB)
gravity model in order to grasp a better understanding of these objects. In
this paper, we have shown that the neutron star properties are considerably
affected by ... | [
{
"created": "Wed, 21 Feb 2024 06:27:07 GMT",
"version": "v1"
}
] | 2024-02-23 | [
[
"Bordbar",
"Gholam Hossein",
""
],
[
"Mazhari",
"Mohammad",
""
],
[
"Poostforush",
"Ahmad",
""
]
] | With regard to the coupling constant and the strong magnetic field of neutron stars, we have studied these stars in the 4D Einstein Gauss Bonnet (4D EGB) gravity model in order to grasp a better understanding of these objects. In this paper, we have shown that the neutron star properties are considerably affected by th... |
1109.3012 | Muhammad Sharif | Muhammad Sharif and Ghulam Abbas | Charged Perfect Fluid Cylindrical Gravitational Collapse | 17 pages, 4 figures, accepted for publication in J. Phys. Soc. Jpn | J. Phys. Soc. Jpn. 80(2011)104002 | 10.1143/JPSJ.80.104002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is devoted to study the charged perfect fluid cylindrical
gravitational collapse. For this purpose, we find a new analytical solution of
the field equations for non-static cylindrically symmetric spacetime. We
discuss physical properties of the solution which predict gravitational
collapse. It is concluded... | [
{
"created": "Wed, 14 Sep 2011 07:51:03 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Sharif",
"Muhammad",
""
],
[
"Abbas",
"Ghulam",
""
]
] | This paper is devoted to study the charged perfect fluid cylindrical gravitational collapse. For this purpose, we find a new analytical solution of the field equations for non-static cylindrically symmetric spacetime. We discuss physical properties of the solution which predict gravitational collapse. It is concluded t... |
0801.3874 | Vladimir Dzhunushaliev | V. Dzhunushaliev, V. Folomeev, S. Myrzakul and R. Myrzakulov | Usual and phantom scalar fields in five dimensions: compactification and
flat thick brane solutions | title is changed, new results are added | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the model of a gravitating system with two scalar fields (one of which is
phantom), two new types of regular solutions are found: mechanism for
compactification of an extra dimension and a flat thick brane solution. It is
shown that the first model has solutions oscillating over the extra coordinate
and giving a f... | [
{
"created": "Fri, 25 Jan 2008 03:30:13 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Oct 2008 16:39:59 GMT",
"version": "v2"
}
] | 2008-10-08 | [
[
"Dzhunushaliev",
"V.",
""
],
[
"Folomeev",
"V.",
""
],
[
"Myrzakul",
"S.",
""
],
[
"Myrzakulov",
"R.",
""
]
] | In the model of a gravitating system with two scalar fields (one of which is phantom), two new types of regular solutions are found: mechanism for compactification of an extra dimension and a flat thick brane solution. It is shown that the first model has solutions oscillating over the extra coordinate and giving a fin... |
1903.04339 | Andr\'es Ace\~na | Andr\'es Ace\~na, Ericson L\'opez, and Franklin Ald\'as | Circular geodesics stability in a static black hole in new massive
gravity | 9 pages, no figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the existence and stability of circular geodesics in a family of
asymptotically AdS static black holes in New Massive Gravity. We show that the
existence of such geodesics is determined by the sign of the hair parameter.
For a positive hair parameter the stability regions follow the usual pattern,
with an in... | [
{
"created": "Mon, 11 Mar 2019 14:51:49 GMT",
"version": "v1"
}
] | 2019-03-12 | [
[
"Aceña",
"Andrés",
""
],
[
"López",
"Ericson",
""
],
[
"Aldás",
"Franklin",
""
]
] | We study the existence and stability of circular geodesics in a family of asymptotically AdS static black holes in New Massive Gravity. We show that the existence of such geodesics is determined by the sign of the hair parameter. For a positive hair parameter the stability regions follow the usual pattern, with an inne... |
2312.10304 | Yiqian Chen | Yiqian Chen, Peng Wang, and Haitang Yang | Interferometric Signatures of Black Holes with Multiple Photon Spheres | 19 pages, 3 figures, references added in revision | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been reported that the photon ring structure in black hole images
produces strong and universal interferometric signatures on long
interferometric baselines, holding promise for measuring black hole parameters
and testing general relativity. This paper investigates the interferometric
signatures of black holes... | [
{
"created": "Sat, 16 Dec 2023 03:43:27 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Jan 2024 08:59:25 GMT",
"version": "v2"
}
] | 2024-01-05 | [
[
"Chen",
"Yiqian",
""
],
[
"Wang",
"Peng",
""
],
[
"Yang",
"Haitang",
""
]
] | It has been reported that the photon ring structure in black hole images produces strong and universal interferometric signatures on long interferometric baselines, holding promise for measuring black hole parameters and testing general relativity. This paper investigates the interferometric signatures of black holes w... |
1001.1162 | Amitabha Lahiri | Sourav Bhattacharya and Amitabha Lahiri | On the existence of cosmological event horizon | v2: 7p. title changed, discussions and references added | Class.Quant.Grav.27:165015,2010 | 10.1088/0264-9381/27/16/165015 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that, for general static or axisymmetric stationary spacetimes, a
cosmological Killing horizon exists only if $R_{ab}n^{a}n^{b}< 0$ for a
hypersurface orthogonal timelike $n^{a}$, at least over some portion of the
region of interest of the manifold. This implies violation of the strong energy
condition by the... | [
{
"created": "Thu, 7 Jan 2010 21:28:37 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Jun 2010 09:47:39 GMT",
"version": "v2"
}
] | 2010-11-17 | [
[
"Bhattacharya",
"Sourav",
""
],
[
"Lahiri",
"Amitabha",
""
]
] | We show that, for general static or axisymmetric stationary spacetimes, a cosmological Killing horizon exists only if $R_{ab}n^{a}n^{b}< 0$ for a hypersurface orthogonal timelike $n^{a}$, at least over some portion of the region of interest of the manifold. This implies violation of the strong energy condition by the m... |
1807.01731 | Arun Mathew | Arun Mathew and Malay Kumar Nandy | Noncommutative dispersion relation and mass-radius relation of white
dwarfs | 4 figures | null | 10.1088/1674-4527/18/12/151 | null | gr-qc astro-ph.HE astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The equation of state of the electron degenerate gas in a white dwarf is
usually treated by employing the ideal dispersion relation. However, the effect
of quantum gravity is expected to be inevitably present and when this effect is
considered through a non-commutative formulation, the dispersion relation
undergoes a... | [
{
"created": "Wed, 4 Jul 2018 18:22:48 GMT",
"version": "v1"
}
] | 2019-01-08 | [
[
"Mathew",
"Arun",
""
],
[
"Nandy",
"Malay Kumar",
""
]
] | The equation of state of the electron degenerate gas in a white dwarf is usually treated by employing the ideal dispersion relation. However, the effect of quantum gravity is expected to be inevitably present and when this effect is considered through a non-commutative formulation, the dispersion relation undergoes a s... |
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