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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/0402085 | Jakob Hansen | Jakob Hansen, Alexei Khokhlov, Igor Novikov | Properties of four numerical schemes applied to a scalar nonlinear
scalar wave equation with a GR-type nonlinearity | 9 pages, 8 Postscript figures | Int.J.Mod.Phys. D13 (2004) 961 | 10.1142/S021827180400502X | null | gr-qc | null | We study stability, dispersion and dissipation properties of four numerical
schemes (Iterative Crank-Nicolson, 3'rd and 4'th order Runge-Kutta and
Courant-Fredrichs-Levy Non-linear). By use of a Von Neumann analysis we study
the schemes applied to a scalar linear wave equation as well as a scalar
non-linear wave equa... | [
{
"created": "Thu, 19 Feb 2004 16:12:50 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Mar 2005 03:14:22 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Hansen",
"Jakob",
""
],
[
"Khokhlov",
"Alexei",
""
],
[
"Novikov",
"Igor",
""
]
] | We study stability, dispersion and dissipation properties of four numerical schemes (Iterative Crank-Nicolson, 3'rd and 4'th order Runge-Kutta and Courant-Fredrichs-Levy Non-linear). By use of a Von Neumann analysis we study the schemes applied to a scalar linear wave equation as well as a scalar non-linear wave equati... |
gr-qc/0602117 | Achamveedu Gopakumar | Thibault Damour, Achamveedu Gopakumar | Gravitational Recoil during Binary Black Hole Coalescence using the
Effective One Body Approach | 46 pages, new figures and discussions, to appear in PRD | Phys.Rev. D73 (2006) 124006 | 10.1103/PhysRevD.73.124006 | null | gr-qc astro-ph | null | Using the Effective One Body approach, that includes nonperturbative resummed
estimates for the damping and conservative parts of the compact binary
dynamics, we compute the recoil during the late inspiral and the subsequent
plunge of non-spinning black holes of comparable masses moving in
quasi-circular orbits. Furt... | [
{
"created": "Tue, 28 Feb 2006 14:36:50 GMT",
"version": "v1"
},
{
"created": "Thu, 18 May 2006 12:30:20 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Damour",
"Thibault",
""
],
[
"Gopakumar",
"Achamveedu",
""
]
] | Using the Effective One Body approach, that includes nonperturbative resummed estimates for the damping and conservative parts of the compact binary dynamics, we compute the recoil during the late inspiral and the subsequent plunge of non-spinning black holes of comparable masses moving in quasi-circular orbits. Furthe... |
1711.04526 | Andronikos Paliathanasis | N. Dimakis, Alex Giacomini and Andronikos Paliathanasis | (Compactified) black branes in four dimensional f(R)-gravity | 13 pages, 3 figures, title changed, minor corrections, new
references, accepted version for publication at Physics Letter B | null | 10.1016/j.physletb.2017.12.059 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new family of analytical solutions in a four dimensional static spacetime
is presented for $f\left( R\right) $-gravity. In contrast to General
Relativity, we find that a non trivial black string/ring solution is supported
in vacuum power law $f\left( R\right) $-gravity for appropriate values of the
parameters chara... | [
{
"created": "Mon, 13 Nov 2017 11:10:25 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Dec 2017 09:14:41 GMT",
"version": "v2"
}
] | 2018-01-17 | [
[
"Dimakis",
"N.",
""
],
[
"Giacomini",
"Alex",
""
],
[
"Paliathanasis",
"Andronikos",
""
]
] | A new family of analytical solutions in a four dimensional static spacetime is presented for $f\left( R\right) $-gravity. In contrast to General Relativity, we find that a non trivial black string/ring solution is supported in vacuum power law $f\left( R\right) $-gravity for appropriate values of the parameters charact... |
1605.00326 | Israel Quiros | Israel Quiros, Ricardo Garc\'ia-Salcedo, Tame Gonzalez, F. Antonio
Horta-Rangel, Joel Saavedra | Brans-Dicke Galileon and the Variational Principle | 20 pages, no figures. The content of this paper is specially
recommended to those graduate and postgraduate students who are interested in
the study of modifications of general relativity such as scalar-tensor and
$f(R)$ theories. Bibliographic references added, minor additions to the text.
Acknowledgements mod... | null | 10.1088/0143-0807/37/5/055605 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is aimed at a (mostly) pedagogical exposition of the derivation of
the motion equations of certain modifications of general relativity. Here we
derive in all detail the motion equations in the Brans-Dicke theory with the
cubic self-interaction. This is a modification of the Brans-dicke theory by the
additi... | [
{
"created": "Mon, 2 May 2016 00:17:13 GMT",
"version": "v1"
},
{
"created": "Wed, 4 May 2016 18:02:55 GMT",
"version": "v2"
}
] | 2016-08-24 | [
[
"Quiros",
"Israel",
""
],
[
"García-Salcedo",
"Ricardo",
""
],
[
"Gonzalez",
"Tame",
""
],
[
"Horta-Rangel",
"F. Antonio",
""
],
[
"Saavedra",
"Joel",
""
]
] | This paper is aimed at a (mostly) pedagogical exposition of the derivation of the motion equations of certain modifications of general relativity. Here we derive in all detail the motion equations in the Brans-Dicke theory with the cubic self-interaction. This is a modification of the Brans-dicke theory by the addition... |
2012.05154 | Neven Bili\'c | Nicolas R. Bertini, Neven Bilic and Davi C. Rodrigues | Primordial perturbations and inflation in a holography inspired
Gauss-Bonnet cosmology | 32 pages, 2 figures, major revision: introduction expanded, an
algebraic mistake corrected, Sections III.A and III.B substantially revised,
one figure added, basic conclusions unchanged, nine references added,
Acknowledgments corrected, accepted in PRD | Phys. Rev. D 105, 023509 (2022) | 10.1103/PhysRevD.105.023509 | RBI-ThPhys-2020-48 | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider an action for gravity that, in addition to the Einstein-Hilbert
term, contains a function of the Ricci scalar and the Gauss-Bonnet invariant.
The specific form of the function considered is motivated by holographic
cosmology. At background level the field equations imply modified Friedmann
equations of th... | [
{
"created": "Wed, 9 Dec 2020 16:45:17 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Dec 2020 10:46:17 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Jul 2021 08:32:18 GMT",
"version": "v3"
},
{
"created": "Wed, 26 Jan 2022 10:02:12 GMT",
"version": "v4"
}
] | 2022-01-27 | [
[
"Bertini",
"Nicolas R.",
""
],
[
"Bilic",
"Neven",
""
],
[
"Rodrigues",
"Davi C.",
""
]
] | We consider an action for gravity that, in addition to the Einstein-Hilbert term, contains a function of the Ricci scalar and the Gauss-Bonnet invariant. The specific form of the function considered is motivated by holographic cosmology. At background level the field equations imply modified Friedmann equations of the ... |
gr-qc/0005130 | Edward Malec | Edward Malec | Diffusion of the electromagnetic energy due to the backscattering off
Schwarzschild geometry | 16 pages, typos corrected | Phys.Rev. D62 (2000) 084034 | 10.1103/PhysRevD.62.084034 | null | gr-qc astro-ph | null | Electromagnetic waves propagate in the Schwarzschild spacetime like in a
nonuniform medium with a varying refraction index. A fraction of the radiation
scatters off the curvature of the geometry. The energy of the backscattered
part of an initially outgoing pulse of electromagnetic radiation can be
estimated, in the ... | [
{
"created": "Wed, 31 May 2000 11:11:39 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jun 2000 12:42:03 GMT",
"version": "v2"
},
{
"created": "Mon, 11 Sep 2000 13:58:40 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Malec",
"Edward",
""
]
] | Electromagnetic waves propagate in the Schwarzschild spacetime like in a nonuniform medium with a varying refraction index. A fraction of the radiation scatters off the curvature of the geometry. The energy of the backscattered part of an initially outgoing pulse of electromagnetic radiation can be estimated, in the ca... |
1009.4388 | Jorgen Rasmussen | Jorgen Rasmussen | On hidden symmetries of extremal Kerr-NUT-AdS-dS black holes | 7 pages | J.Geom.Phys.61:922-926,2011 | 10.1016/j.geomphys.2011.01.006 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that the Kerr-NUT-AdS-dS black hole admits two linearly
independent Killing vectors and possesses a hidden symmetry generated by a
rank-2 Killing tensor. The near-horizon geometry of an extremal Kerr-NUT-AdS-dS
black hole admits four linearly independent Killing vectors, and we show how
the hidden sy... | [
{
"created": "Wed, 22 Sep 2010 15:28:14 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Sep 2010 08:42:41 GMT",
"version": "v2"
}
] | 2011-03-02 | [
[
"Rasmussen",
"Jorgen",
""
]
] | It is well known that the Kerr-NUT-AdS-dS black hole admits two linearly independent Killing vectors and possesses a hidden symmetry generated by a rank-2 Killing tensor. The near-horizon geometry of an extremal Kerr-NUT-AdS-dS black hole admits four linearly independent Killing vectors, and we show how the hidden symm... |
2003.02646 | Vladimir Dzhunushaliev | Vladimir Dzhunushaliev and Vladimir Folomeev | Spinor field solutions in $F\left(B^2\right)$ modified Weyl gravity | 11pages | null | 10.1142/S0218271820500947 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider modified Weyl gravity where a Dirac spinor field is nonminimally
coupled to gravity. It is assumed that such modified gravity is some
approximation for the description of quantum gravitational effects related to
the gravitating spinor field. It is shown that such a theory contains solutions
for a class of... | [
{
"created": "Tue, 3 Mar 2020 11:18:23 GMT",
"version": "v1"
},
{
"created": "Mon, 11 May 2020 08:56:42 GMT",
"version": "v2"
}
] | 2020-11-18 | [
[
"Dzhunushaliev",
"Vladimir",
""
],
[
"Folomeev",
"Vladimir",
""
]
] | We consider modified Weyl gravity where a Dirac spinor field is nonminimally coupled to gravity. It is assumed that such modified gravity is some approximation for the description of quantum gravitational effects related to the gravitating spinor field. It is shown that such a theory contains solutions for a class of m... |
2307.13588 | Fatemeh Sadeghi | Behrouz Mirza, Parichehr Kangazian Kangazi and Fatemeh Sadeghi | A class of rotating metrics in the presence of a scalar field | 12 pages and 4 figures | Eur. Phys. J. C (2023) 83:1161 | 10.1140/epjc/s10052-023-12255-7 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a class of three parameter static and axially symmetric metrics
that reduce to the Janis-Newman-Winicour (JNW) and $ \gamma$-metrics in certain
limits of the parameters. We obtain rotating form of the metrics that are
asymptotically flat, stationary and axisymmetric. In certain values of the
parameters, t... | [
{
"created": "Tue, 25 Jul 2023 15:47:08 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Nov 2023 17:23:30 GMT",
"version": "v2"
}
] | 2023-12-21 | [
[
"Mirza",
"Behrouz",
""
],
[
"Kangazi",
"Parichehr Kangazian",
""
],
[
"Sadeghi",
"Fatemeh",
""
]
] | We consider a class of three parameter static and axially symmetric metrics that reduce to the Janis-Newman-Winicour (JNW) and $ \gamma$-metrics in certain limits of the parameters. We obtain rotating form of the metrics that are asymptotically flat, stationary and axisymmetric. In certain values of the parameters, the... |
0707.0864 | Vladislav Vaganov | Vladislav Vaganov | Self-gravitating radiation in AdS(d) | 21 pages, 4 figures, JHEP style; revised version | null | null | DAMTP-2007-66 | gr-qc hep-th | null | We study spherically symmetric equilibrium configurations of self-gravitating
massless thermal radiation in asymptotically anti-de Sitter space. In d=4, it
was shown by Page and Phillips that there is a maximum red-shifted temperature,
maximum mass and maximum entropy. For higher central densities, the
temperature, m... | [
{
"created": "Thu, 5 Jul 2007 19:59:30 GMT",
"version": "v1"
},
{
"created": "Sat, 7 Jul 2007 02:00:31 GMT",
"version": "v2"
},
{
"created": "Tue, 24 Jul 2007 19:59:50 GMT",
"version": "v3"
},
{
"created": "Thu, 2 Aug 2007 19:39:22 GMT",
"version": "v4"
}
] | 2007-08-02 | [
[
"Vaganov",
"Vladislav",
""
]
] | We study spherically symmetric equilibrium configurations of self-gravitating massless thermal radiation in asymptotically anti-de Sitter space. In d=4, it was shown by Page and Phillips that there is a maximum red-shifted temperature, maximum mass and maximum entropy. For higher central densities, the temperature, mas... |
0803.3162 | Alessandro Nagar | Thibault Damour, Alessandro Nagar, Mark Hannam, Sascha Husa, Bernd
Brugmann | Accurate Effective-One-Body waveforms of inspiralling and coalescing
black-hole binaries | 25 pages, 15 figures. Improved discussion about errors on numerical
relativity data. Version published in Phys. Rev. D | Phys.Rev.D78:044039,2008 | 10.1103/PhysRevD.78.044039 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Effective-One-Body (EOB) formalism contains several flexibility
parameters, notably $a_5$, $\vp$ and $\a$. We show here how to jointly
constrain the values of these parameters by simultaneously best-fitting the EOB
waveform to two, independent, numerical relativity (NR) simulations of
inspiralling and/or coalesci... | [
{
"created": "Fri, 21 Mar 2008 13:17:22 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Aug 2008 09:12:04 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Damour",
"Thibault",
""
],
[
"Nagar",
"Alessandro",
""
],
[
"Hannam",
"Mark",
""
],
[
"Husa",
"Sascha",
""
],
[
"Brugmann",
"Bernd",
""
]
] | The Effective-One-Body (EOB) formalism contains several flexibility parameters, notably $a_5$, $\vp$ and $\a$. We show here how to jointly constrain the values of these parameters by simultaneously best-fitting the EOB waveform to two, independent, numerical relativity (NR) simulations of inspiralling and/or coalescing... |
1412.8666 | Alireza Sepehri | M. R. Setare, A. Sepehri | Stability of cylindrical thin shell wormhole during evolution of
universe from inflation to late time acceleration | 18 pages, 6 figures.v2, accepted in JHEP | null | 10.1007/JHEP03(2015)079 | null | gr-qc | http://creativecommons.org/licenses/by/3.0/ | In this paper, we consider the stability of cylindrical wormholes during
evolution of universe from inflation to late time acceleration epochs. We show
that there are two types of cylindrical wormholes. The first type is produced
at the corresponding point where k black F-strings are transited to BIon
configuration. ... | [
{
"created": "Sun, 28 Dec 2014 09:16:24 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Feb 2015 11:21:05 GMT",
"version": "v2"
}
] | 2015-06-23 | [
[
"Setare",
"M. R.",
""
],
[
"Sepehri",
"A.",
""
]
] | In this paper, we consider the stability of cylindrical wormholes during evolution of universe from inflation to late time acceleration epochs. We show that there are two types of cylindrical wormholes. The first type is produced at the corresponding point where k black F-strings are transited to BIon configuration. Th... |
2006.08918 | Alvin Chua | Alvin J. K. Chua, Michele Vallisneri | On parametric tests of relativity with false degrees of freedom | 4 pages, 2 figures | null | null | null | gr-qc astro-ph.IM stat.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | General relativity can be tested by comparing the binary-inspiral signals
found in LIGO--Virgo data against waveform models that are augmented with
artificial degrees of freedom. This approach suffers from a number of logical
and practical pitfalls. 1) It is difficult to ascribe meaning to the stringency
of the resul... | [
{
"created": "Tue, 16 Jun 2020 04:29:32 GMT",
"version": "v1"
}
] | 2020-06-17 | [
[
"Chua",
"Alvin J. K.",
""
],
[
"Vallisneri",
"Michele",
""
]
] | General relativity can be tested by comparing the binary-inspiral signals found in LIGO--Virgo data against waveform models that are augmented with artificial degrees of freedom. This approach suffers from a number of logical and practical pitfalls. 1) It is difficult to ascribe meaning to the stringency of the resulta... |
2010.11908 | Torben Frost | Torben C. Frost and Volker Perlick (ZARM, University of Bremen,
Bremen, Germany) | Lightlike Geodesics and Gravitational Lensing in the Spacetime of an
Accelerating Black Hole | 37 pages, 13 figures; updated and added new references, corrected
typos, minor changes and additions in the text, (e.g., black holes in uniform
motion, brief discussion of accelerating black holes with NUT charge,
extended discussion of the shadow), modified figure fonts | Class. Quantum Grav. 38, 085016 (2021) | 10.1088/1361-6382/abe0f5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The C-metric is a solution to Einstein's vacuum field equation that describes
an accelerating black hole. In this paper we discuss the propagation of light
rays and the resulting lensing features in this metric. We first solve the
lightlike geodesic equation using elliptic integrals and Jacobi elliptic
functions. The... | [
{
"created": "Thu, 22 Oct 2020 17:43:34 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jan 2021 12:51:58 GMT",
"version": "v2"
}
] | 2021-06-09 | [
[
"Frost",
"Torben C.",
"",
"ZARM, University of Bremen,\n Bremen, Germany"
],
[
"Perlick",
"Volker",
"",
"ZARM, University of Bremen,\n Bremen, Germany"
]
] | The C-metric is a solution to Einstein's vacuum field equation that describes an accelerating black hole. In this paper we discuss the propagation of light rays and the resulting lensing features in this metric. We first solve the lightlike geodesic equation using elliptic integrals and Jacobi elliptic functions. Then ... |
1511.05999 | Sergey G. Klimenko | S. Klimenko, G. Vedovato, M. Drago, F. Salemi, V. Tiwari, G. A. Prodi,
C. Lazzaro, K. Ackley, S. Tiwari, C. F. Da Silva Cost- and G. Mitselmakher | Method for detection and reconstruction of gravitational wave transients
with networks of advanced detectors | 9 pages, 4 figures, 1 table | Phys. Rev. D 93, 042004 (2016) | 10.1103/PhysRevD.93.042004 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a method for detection and reconstruction of the
gravitational-wave (GW) transients with the networks of advanced detectors.
Originally designed to search for transients with the initial GW detectors, it
uses significantly improved algorithms, which enhances both the low-latency
searches with rapid localiz... | [
{
"created": "Wed, 18 Nov 2015 22:10:18 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Dec 2015 00:45:47 GMT",
"version": "v2"
},
{
"created": "Fri, 22 Jan 2016 16:03:22 GMT",
"version": "v3"
}
] | 2016-02-17 | [
[
"Klimenko",
"S.",
""
],
[
"Vedovato",
"G.",
""
],
[
"Drago",
"M.",
""
],
[
"Salemi",
"F.",
""
],
[
"Tiwari",
"V.",
""
],
[
"Prodi",
"G. A.",
""
],
[
"Lazzaro",
"C.",
""
],
[
"Ackley",
"K.",
... | We present a method for detection and reconstruction of the gravitational-wave (GW) transients with the networks of advanced detectors. Originally designed to search for transients with the initial GW detectors, it uses significantly improved algorithms, which enhances both the low-latency searches with rapid localizat... |
0903.0067 | Davood Momeni | D. Momeni, H. Gholizade | A note on constant curvature solutions in cylindrically symmetric metric
$f(R)$ Gravity | 13 pages,Typos corrected and references added, accepted for
publication in "International journal of modern physics D"(IJMPD), Conclusion
and more notes is added,replaced with the published version, The title is
changed | Int.J.Mod.Phys.D18:1719-1729,2009 | 10.1142/S0218271809015266 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the previous work we introduced a new static cylindrically symmetric
vacuum solutions in Weyl coordinates in the context of the metric f(R) theories
of gravity\cite{1}. Now we obtain a 2-parameter family of exact solutions which
contains cosmological constant and a new parameter as $\beta$. This solution
correspon... | [
{
"created": "Sat, 28 Feb 2009 11:42:15 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Mar 2009 16:36:04 GMT",
"version": "v2"
},
{
"created": "Mon, 30 Mar 2009 08:12:54 GMT",
"version": "v3"
},
{
"created": "Fri, 29 May 2009 15:03:20 GMT",
"version": "v4"
},
{
"cr... | 2010-04-23 | [
[
"Momeni",
"D.",
""
],
[
"Gholizade",
"H.",
""
]
] | In the previous work we introduced a new static cylindrically symmetric vacuum solutions in Weyl coordinates in the context of the metric f(R) theories of gravity\cite{1}. Now we obtain a 2-parameter family of exact solutions which contains cosmological constant and a new parameter as $\beta$. This solution corresponds... |
1106.6238 | Hing Tong Cho | H. T. Cho, A. S. Cornell, Jason Doukas, and Wade Naylor | Angular Eigenvalues of Higher-Dimensional Kerr-(A)dS Black Holes with
Two Rotations | 10 pages, no figures. To appear in the proceedings of 2011 Shanghai
Asia-Pacific School and Workshop on Gravitation | null | 10.1142/S201019451200431X | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, following the work of Chen, L\"u and Pope, we present the
general metric for Kerr-(A)dS black holes with two rotations. The corresponding
Klein-Gordon equation is separated explicitly, from which we develop
perturbative expansions for the angular eigenvalues in powers of the rotation
parameters with $D... | [
{
"created": "Thu, 30 Jun 2011 14:19:58 GMT",
"version": "v1"
}
] | 2015-05-28 | [
[
"Cho",
"H. T.",
""
],
[
"Cornell",
"A. S.",
""
],
[
"Doukas",
"Jason",
""
],
[
"Naylor",
"Wade",
""
]
] | In this paper, following the work of Chen, L\"u and Pope, we present the general metric for Kerr-(A)dS black holes with two rotations. The corresponding Klein-Gordon equation is separated explicitly, from which we develop perturbative expansions for the angular eigenvalues in powers of the rotation parameters with $D\g... |
2306.01054 | Tuhin Malik | K. Nobleson and Sarmistha Banik and Tuhin Malik | Unveiling a universal relationship between the f(R) parameter and
neutron star properties | 10 pages, 7 figures, 3 tables | null | 10.1103/PhysRevD.107.124045 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In recent years, modified gravity theories have gained significant attention
as potential replacements for the general theory of relativity. Neutron stars,
which are dense compact objects, provide ideal astrophysical laboratories for
testing these theories. However, understanding the properties of neutron stars
withi... | [
{
"created": "Thu, 1 Jun 2023 18:00:40 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Jul 2023 14:50:27 GMT",
"version": "v2"
}
] | 2023-07-20 | [
[
"Nobleson",
"K.",
""
],
[
"Banik",
"Sarmistha",
""
],
[
"Malik",
"Tuhin",
""
]
] | In recent years, modified gravity theories have gained significant attention as potential replacements for the general theory of relativity. Neutron stars, which are dense compact objects, provide ideal astrophysical laboratories for testing these theories. However, understanding the properties of neutron stars within ... |
1204.0091 | Vladimir Ivashchuk | A. A. Golubtsova and V. D. Ivashchuk | Exact solutions in gravity with a sigma model source | 22 pages, Latex, several phrases and 4 refs. are addes, few typos are
eliminated | General Relativity and Gravitation, 44, No 10, 2571-2594 (2012) | 10.1007/s10714-012-1415-7 | ICG-PFUR-12-03/1v2 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a D-dimensional model of gravity with non-linear "scalar fields"
as a matter source. The model is defined on the product manifold M, which
contains n Einstein factor spaces. General cosmological type solutions to the
field equations are obtained when n-1 factor spaces are Ricci-flat, e.g. when
one space M... | [
{
"created": "Sat, 31 Mar 2012 09:58:03 GMT",
"version": "v1"
},
{
"created": "Tue, 8 May 2012 13:50:42 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Golubtsova",
"A. A.",
""
],
[
"Ivashchuk",
"V. D.",
""
]
] | We consider a D-dimensional model of gravity with non-linear "scalar fields" as a matter source. The model is defined on the product manifold M, which contains n Einstein factor spaces. General cosmological type solutions to the field equations are obtained when n-1 factor spaces are Ricci-flat, e.g. when one space M_1... |
gr-qc/0410015 | Sayandeb Basu | Sayandeb Basu | Perturbation theory in covariant canonical quantization | 15 pages, no figures. Version 2. Introduction significantly
restructured to put this work in porper context. Contents unchanged, few
references added | Phys.Rev. D71 (2005) 084001 | 10.1103/PhysRevD.71.084001 | UCD-04-27 | gr-qc | null | I investigate a new idea of perturbation theory in covariant canonical
quantization. I present preliminary results for a toy model of a harmonic
oscillator with a quartic perturbation, and show that this method reproduces
the quantized spectrum of standard quantum theory. This result indicates that
when the exact sol... | [
{
"created": "Mon, 4 Oct 2004 20:33:31 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Dec 2004 04:16:41 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Basu",
"Sayandeb",
""
]
] | I investigate a new idea of perturbation theory in covariant canonical quantization. I present preliminary results for a toy model of a harmonic oscillator with a quartic perturbation, and show that this method reproduces the quantized spectrum of standard quantum theory. This result indicates that when the exact solut... |
1410.1486 | Steven Carlip | S. Carlip | Black Hole Thermodynamics | Invited review article. A few parts based on an earlier review,
arXiv:0807.4520. To appear in Int. J. Mod. Phys. D and in "One Hundred Years
of General Relativity: Cosmology and Gravity," edited by Wei-Tou Ni (World
Scientific, Singapore, 2015). v2: added references and appendix | null | 10.1142/S0218271814300237 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The discovery in the early 1970s that black holes radiate as black bodies has
radically affected our understanding of general relativity, and offered us some
early hints about the nature of quantum gravity. In this chapter I will review
the discovery of black hole thermodynamics and summarize the many independent
way... | [
{
"created": "Mon, 6 Oct 2014 18:37:55 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Aug 2015 00:04:20 GMT",
"version": "v2"
}
] | 2015-08-27 | [
[
"Carlip",
"S.",
""
]
] | The discovery in the early 1970s that black holes radiate as black bodies has radically affected our understanding of general relativity, and offered us some early hints about the nature of quantum gravity. In this chapter I will review the discovery of black hole thermodynamics and summarize the many independent ways ... |
1905.03118 | Anuradha Samajdar | Anuradha Samajdar and Tim Dietrich | Waveform systematics for binary neutron star gravitational wave signals:
Effects of spin, precession, and the observation of electromagnetic
counterparts | 10 pages, 4 figures, 3 tables | Phys. Rev. D 100, 024046 (2019) | 10.1103/PhysRevD.100.024046 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Extracting the properties of a binary system emitting gravitational waves
relies on models describing the last stages of the compact binary coalescence.
In this article, we study potential biases inherent to current tidal waveform
approximants for spinning and precessing systems. We perform a Bayesian study
to estima... | [
{
"created": "Wed, 8 May 2019 14:51:34 GMT",
"version": "v1"
}
] | 2019-07-31 | [
[
"Samajdar",
"Anuradha",
""
],
[
"Dietrich",
"Tim",
""
]
] | Extracting the properties of a binary system emitting gravitational waves relies on models describing the last stages of the compact binary coalescence. In this article, we study potential biases inherent to current tidal waveform approximants for spinning and precessing systems. We perform a Bayesian study to estimate... |
1805.05919 | Avirup Ghosh | C. Fairoos, Avirup Ghosh and Sudipta Sarkar | Boundary Conservation from Bulk Symmetry | Essay received honourable mention in the `Gravity Research Foundation
2018 Awards for Essays on Gravitation` | Int.J.Mod.Phys. D27 (2018) no.14, 1847023 | 10.1142/S0218271818470235 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The evolution of the black hole horizon can be effectively captured by a
fictitious membrane fluid living on the stretched horizon. We show that the
dynamics of this boundary matter arises from the invariance of the bulk action
under local symmetries in the presence of the inner boundary. If general
covariance is bro... | [
{
"created": "Tue, 15 May 2018 17:21:59 GMT",
"version": "v1"
}
] | 2018-12-04 | [
[
"Fairoos",
"C.",
""
],
[
"Ghosh",
"Avirup",
""
],
[
"Sarkar",
"Sudipta",
""
]
] | The evolution of the black hole horizon can be effectively captured by a fictitious membrane fluid living on the stretched horizon. We show that the dynamics of this boundary matter arises from the invariance of the bulk action under local symmetries in the presence of the inner boundary. If general covariance is broke... |
1404.6081 | Hyeong-Chan Kim | Inyong Cho and Hyeong-Chan Kim | Inflationary Tensor Perturbation in Eddington-inspired Born-Infeld
gravity | 14 pages, 4 figures | Phys. Rev. D 90, 024063 (2014) | 10.1103/PhysRevD.90.024063 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the tensor perturbation in the inflation model driven by a
massive-scalar field in Eddington-inspired Born-Infeld gravity. For short
wave-length modes, the perturbation feature is very similar to that of the
usual chaotic inflation. For long wave-length modes, the perturbation exhibits
a peculiar rise ... | [
{
"created": "Thu, 24 Apr 2014 10:46:59 GMT",
"version": "v1"
}
] | 2014-07-30 | [
[
"Cho",
"Inyong",
""
],
[
"Kim",
"Hyeong-Chan",
""
]
] | We investigate the tensor perturbation in the inflation model driven by a massive-scalar field in Eddington-inspired Born-Infeld gravity. For short wave-length modes, the perturbation feature is very similar to that of the usual chaotic inflation. For long wave-length modes, the perturbation exhibits a peculiar rise in... |
1112.2134 | Alexey Golovnev | Alexey Golovnev | On the Hamiltonian analysis of non-linear massive gravity | 8 pages; minor changes; one of the references and the sign of the
potential term are corrected; the reference list is expanded | Physics Letters B 707 (2012), pp. 404-408 | 10.1016/j.physletb.2011.12.064 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we present a very simple and independent argument for the
absence of the Boulware-Deser ghost in the recently proposed potentially
ghost-free non-linear massive gravity. The limitation is that, in its simple
form, the argument is, in a sense, non-constructive and less explicit than the
standard approach... | [
{
"created": "Fri, 9 Dec 2011 16:08:54 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Dec 2011 16:54:25 GMT",
"version": "v2"
}
] | 2012-01-11 | [
[
"Golovnev",
"Alexey",
""
]
] | In this paper we present a very simple and independent argument for the absence of the Boulware-Deser ghost in the recently proposed potentially ghost-free non-linear massive gravity. The limitation is that, in its simple form, the argument is, in a sense, non-constructive and less explicit than the standard approach. ... |
2204.10396 | Medine Ildes | Medine Ildes and Metin Arik | Analytic Solutions of Brans-Dicke Cosmology: Early Inflation and Late
Time Accelerated Expansion | null | null | 10.1142/S0218271822501310 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We investigate the most general exact solutions of Brans-Dicke cosmology by
choosing the scale factor "a" as the new independent variable. It is shown that
a set of three field equations can be reduced to a constraint equation and a
first order linear differential equation. Thus this new set of equations is
solvable ... | [
{
"created": "Thu, 21 Apr 2022 20:28:42 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jul 2022 16:36:33 GMT",
"version": "v2"
}
] | 2023-02-15 | [
[
"Ildes",
"Medine",
""
],
[
"Arik",
"Metin",
""
]
] | We investigate the most general exact solutions of Brans-Dicke cosmology by choosing the scale factor "a" as the new independent variable. It is shown that a set of three field equations can be reduced to a constraint equation and a first order linear differential equation. Thus this new set of equations is solvable wh... |
0704.2994 | Robert Bluhm | R. Bluhm | Spontaneous Lorentz Violation, Gravity, and Nambu-Goldstone Modes | 3 pages, talk given at the 11th Marcel Grossmann Meeting, Berlin,
Germany, July 2006; typos corrected | null | 10.1142/9789812834300_0110 | null | gr-qc | null | A brief summary is presented of recent work examining the fate of the
Nambu-Goldstone modes in gravitational theories with spontaneous Lorentz
violation.
| [
{
"created": "Mon, 23 Apr 2007 12:55:01 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Apr 2008 17:39:23 GMT",
"version": "v2"
}
] | 2016-11-15 | [
[
"Bluhm",
"R.",
""
]
] | A brief summary is presented of recent work examining the fate of the Nambu-Goldstone modes in gravitational theories with spontaneous Lorentz violation. |
2205.07962 | Yijun Wang | Yijun Wang, Kris Pardo, Tzu-Ching Chang, Olivier Dor\'e | Constraining the Stochastic Gravitational Wave Background with
Photometric Surveys | 7 pages, 2 figures; updated with minor text changes | Phys. Rev. D 106, 084006 (2022) | 10.1103/PhysRevD.106.084006 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The detection of the Stochastic Gravitational Wave Background (SGWB) is
essential for understanding black hole populations, especially for supermassive
black hole binaries. The recent promising results from various Pulsar Timing
Array (PTA) collaborations allude to an imminent detection. In this paper, we
investigate... | [
{
"created": "Mon, 16 May 2022 19:59:19 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Oct 2022 18:13:39 GMT",
"version": "v2"
}
] | 2022-10-14 | [
[
"Wang",
"Yijun",
""
],
[
"Pardo",
"Kris",
""
],
[
"Chang",
"Tzu-Ching",
""
],
[
"Doré",
"Olivier",
""
]
] | The detection of the Stochastic Gravitational Wave Background (SGWB) is essential for understanding black hole populations, especially for supermassive black hole binaries. The recent promising results from various Pulsar Timing Array (PTA) collaborations allude to an imminent detection. In this paper, we investigate t... |
1311.6891 | Llu\'is Bel | Ll. Bel | Phantom mass gravitational effects | 5 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I derive the basic relativistic corrections to the equations of motion of
test particles and light rays in the field of a source with active mass $m$,
including the phantom mass density that any such source generates when a
modification of Newton's action at a distance includes a long range term. The
technical framew... | [
{
"created": "Wed, 27 Nov 2013 07:54:57 GMT",
"version": "v1"
}
] | 2013-11-28 | [
[
"Bel",
"Ll.",
""
]
] | I derive the basic relativistic corrections to the equations of motion of test particles and light rays in the field of a source with active mass $m$, including the phantom mass density that any such source generates when a modification of Newton's action at a distance includes a long range term. The technical framewor... |
1912.11309 | Masahiko Taniguchi | Tomohiro Inagaki, Masahiko Taniguchi | Gravitational waves in Modified Gauss-Bonnet Gravity | 14 pages, 7 figures | International Journal of Modern Physics D, Vol. 29(2020) 2050072 | 10.1142/S0218271820500728 | HUPD1915 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the gravitational waves in modified Gauss-Bonnet gravity. Applying
the metric perturbation around a cosmological background, we obtain explicit
expressions for the wave equations. It is shown that the speed of the traceless
mode is equal to the speed of light. An additional massive scalar mode appears
in the... | [
{
"created": "Tue, 24 Dec 2019 12:15:46 GMT",
"version": "v1"
},
{
"created": "Sun, 31 May 2020 07:17:25 GMT",
"version": "v2"
}
] | 2020-08-25 | [
[
"Inagaki",
"Tomohiro",
""
],
[
"Taniguchi",
"Masahiko",
""
]
] | We study the gravitational waves in modified Gauss-Bonnet gravity. Applying the metric perturbation around a cosmological background, we obtain explicit expressions for the wave equations. It is shown that the speed of the traceless mode is equal to the speed of light. An additional massive scalar mode appears in the p... |
0809.1131 | Ahmad Sheykhi | A. Sheykhi and M. Allahverdizadeh | Higher dimensional slowly rotating dilaton black holes in AdS spacetime | 11 pages, 1 figure, the version to appear in Phys. Rev. D | Phys.Rev.D78:064073,2008 | 10.1103/PhysRevD.78.064073 | null | gr-qc | http://creativecommons.org/licenses/by/3.0/ | In this paper, with an appropriate combination of three Liouville-type
dilaton potentials, we obtain the higher dimensional charged slowly rotating
dilaton black hole solution for asymptotically anti-de Sitter spacetime. The
angular momentum and the gyromagnetic ratio of such a black hole are determined
for the arbit... | [
{
"created": "Sat, 6 Sep 2008 04:35:17 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Sep 2008 05:32:10 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Sheykhi",
"A.",
""
],
[
"Allahverdizadeh",
"M.",
""
]
] | In this paper, with an appropriate combination of three Liouville-type dilaton potentials, we obtain the higher dimensional charged slowly rotating dilaton black hole solution for asymptotically anti-de Sitter spacetime. The angular momentum and the gyromagnetic ratio of such a black hole are determined for the arbitra... |
1007.3304 | Jose Socorro Garcia | J. Socorro and Marco D'Oleire | Inflation from Supersymmetric Quantum Cosmology | 14 pages, latex2e, To appear in Phys. Rev. D | Phys.Rev.D82:044008,2010 | 10.1103/PhysRevD.82.044008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a special scalar field potential using the anisotropic Bianchi type
I cosmological model from canonical quantum cosmology under determined
conditions in the evolution to anisotropic variables $\beta_\pm$. In the
process, we obtain a family of potentials that has been introduced by hand in
the literature to ... | [
{
"created": "Mon, 19 Jul 2010 23:15:34 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Socorro",
"J.",
""
],
[
"D'Oleire",
"Marco",
""
]
] | We derive a special scalar field potential using the anisotropic Bianchi type I cosmological model from canonical quantum cosmology under determined conditions in the evolution to anisotropic variables $\beta_\pm$. In the process, we obtain a family of potentials that has been introduced by hand in the literature to ex... |
1905.05216 | Steven Carlip | S. Carlip | How to Hide a Cosmological Constant | Fourth award, Gravity Research Foundation 2019 Awards for Essays on
Gravitation; based in part on arXiv:1809.08277; 5 pages | null | 10.1142/S0218271819430041 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Naive calculations in quantum field theory suggest that vacuum fluctuations
should induce an enormous cosmological constant. What if these estimates are
right? I argue that even a huge cosmological constant might be hidden in Planck
scale fluctuations of geometry and topology---what Wheeler called `spacetime
foam'---... | [
{
"created": "Mon, 13 May 2019 18:06:34 GMT",
"version": "v1"
}
] | 2020-01-08 | [
[
"Carlip",
"S.",
""
]
] | Naive calculations in quantum field theory suggest that vacuum fluctuations should induce an enormous cosmological constant. What if these estimates are right? I argue that even a huge cosmological constant might be hidden in Planck scale fluctuations of geometry and topology---what Wheeler called `spacetime foam'---wh... |
2302.14333 | Subenoy Chakraborty | Roshni Bhaumik, Sourav Dutta, and Subenoy Chakraborty | Noether Symmetry analysis in Chameleon Field Cosmology | 19 pages, 4 figures | null | 10.1142/S0217751X2250018X | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | This work deals with chameleon field cosmology (a scalar field nonminimally
coupled to cold dark matter) in the background of flat
Friedmann-Lemaitre-Robertson-Walker (FLRW) space-time. Both classical and
quantum cosmology have been investigated using Noether symmetry analysis of the
underlying physical system. The W... | [
{
"created": "Tue, 28 Feb 2023 06:02:30 GMT",
"version": "v1"
}
] | 2023-03-01 | [
[
"Bhaumik",
"Roshni",
""
],
[
"Dutta",
"Sourav",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | This work deals with chameleon field cosmology (a scalar field nonminimally coupled to cold dark matter) in the background of flat Friedmann-Lemaitre-Robertson-Walker (FLRW) space-time. Both classical and quantum cosmology have been investigated using Noether symmetry analysis of the underlying physical system. The Whe... |
gr-qc/0408069 | Daniel Barraco | A. E. Dominguez and D. E. Barraco | Newtonian limit of the singular f(R) gravity in the Palatini formalism | 9 pages | Phys.Rev. D70 (2004) 043505 | 10.1103/PhysRevD.70.043505 | null | gr-qc astro-ph hep-th | null | Recently D. Vollick [Phys. Rev. D68, 063510 (2003)] has shown that the
inclusion of the 1/R curvature terms in the gravitational action and the use of
the Palatini formalism offer an alternative explanation for cosmological
acceleration. In this work we show not only that this model of Vollick does not
have a good Ne... | [
{
"created": "Thu, 19 Aug 2004 21:56:03 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Dominguez",
"A. E.",
""
],
[
"Barraco",
"D. E.",
""
]
] | Recently D. Vollick [Phys. Rev. D68, 063510 (2003)] has shown that the inclusion of the 1/R curvature terms in the gravitational action and the use of the Palatini formalism offer an alternative explanation for cosmological acceleration. In this work we show not only that this model of Vollick does not have a good Newt... |
gr-qc/0209097 | Osvaldo M. Moreschi | Osvaldo M. Moreschi | Intrinsic angular momentum in general relativity | 4 pages, 2 figures | Class.Quant.Grav. 21 (2004) 5409-5426 | 10.1088/0264-9381/21/23/008 | null | gr-qc | null | There are several definitions of the notion of angular momentum in general
relativity. However non of them can be said to capture the physical notion of
intrinsic angular momentum of the sources in the presence of gravitational
radiation. We present a definition which is appropriate for the description of
intrinsic a... | [
{
"created": "Wed, 25 Sep 2002 19:09:05 GMT",
"version": "v1"
},
{
"created": "Fri, 2 May 2003 17:47:55 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Moreschi",
"Osvaldo M.",
""
]
] | There are several definitions of the notion of angular momentum in general relativity. However non of them can be said to capture the physical notion of intrinsic angular momentum of the sources in the presence of gravitational radiation. We present a definition which is appropriate for the description of intrinsic ang... |
1511.02019 | Titus K Mathew | Paxy George and Titus K Mathew | Holographic Ricci dark energy as running vacuum | 10 pages | null | 10.1142/S0217732316500759 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Holographic Ricci dark energy has been proposed ago has faced with problems
of future singularity. In the present work we consider the Ricci dark energy
with an additive constant in it's density as running vacuum energy. We have
analytically solved the Friedmann equations and also the role played by the
general conse... | [
{
"created": "Fri, 6 Nov 2015 10:09:29 GMT",
"version": "v1"
}
] | 2016-05-25 | [
[
"George",
"Paxy",
""
],
[
"Mathew",
"Titus K",
""
]
] | Holographic Ricci dark energy has been proposed ago has faced with problems of future singularity. In the present work we consider the Ricci dark energy with an additive constant in it's density as running vacuum energy. We have analytically solved the Friedmann equations and also the role played by the general conserv... |
2108.12670 | Bikram Ghosh | Bikram Ghosh and Saugata Mitra | Wormhole solutions in $f(R)$ gravity theory for Chaplygin gas scenario | null | Int.J.Mod.Phys.A 36 (2021) 18, 2150119 | 10.1142/S0217751X21501190 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present paper deals with some wormhole solutions which are obtained by
taking two different shape functions along with zero tidal force. For obtaining
wormhole solutions, anisotropic fluid and a equation of state
$p_t=-\frac{a}{\rho}$ related by Chaplygin gas are considered where $\rho$ is
the energy density, $p_... | [
{
"created": "Sat, 28 Aug 2021 16:07:00 GMT",
"version": "v1"
}
] | 2021-08-31 | [
[
"Ghosh",
"Bikram",
""
],
[
"Mitra",
"Saugata",
""
]
] | The present paper deals with some wormhole solutions which are obtained by taking two different shape functions along with zero tidal force. For obtaining wormhole solutions, anisotropic fluid and a equation of state $p_t=-\frac{a}{\rho}$ related by Chaplygin gas are considered where $\rho$ is the energy density, $p_t$... |
1912.04636 | Mohammad Ali Gorji | Mohammad Ali Gorji, Alireza Allahyari, Mohsen Khodadi, Hassan
Firouzjahi | Mimetic Black Holes | 26 pages, 4 figures, matches published version | Phys. Rev. D 101, 124060 (2020) | 10.1103/PhysRevD.101.124060 | YITP-20-20 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we look for the vacuum static spherically symmetric solution
in the mimetic gravity scenario based on the conformal invariance principle.
The trivial solution is a stealth Schwarzschild black hole with scalar hair
where the mimetic field does not contribute to the background. However, a
solution with t... | [
{
"created": "Tue, 10 Dec 2019 10:53:24 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Mar 2020 15:19:17 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Jun 2020 10:53:58 GMT",
"version": "v3"
}
] | 2020-07-08 | [
[
"Gorji",
"Mohammad Ali",
""
],
[
"Allahyari",
"Alireza",
""
],
[
"Khodadi",
"Mohsen",
""
],
[
"Firouzjahi",
"Hassan",
""
]
] | In this paper, we look for the vacuum static spherically symmetric solution in the mimetic gravity scenario based on the conformal invariance principle. The trivial solution is a stealth Schwarzschild black hole with scalar hair where the mimetic field does not contribute to the background. However, a solution with two... |
gr-qc/0512158 | Orfeu Bertolami | M.C. Bento, O. Bertolami, M.J. Rebou\c{c}as, P.T. Silva | Generalized Chaplygin gas model, supernovae and cosmic topology | Revtex 4, 8 pages, 10 figures, 1 table; version to match the
published one | Phys.Rev.D73:043504,2006 | 10.1103/PhysRevD.73.043504 | null | gr-qc astro-ph hep-ph hep-th | null | In this work we study to which extent the knowledge of spatial topology may
place constraints on the parameters of the generalized Chaplygin gas (GCG)
model for unification of dark energy and dark matter. By using both the
Poincar\'e dodecahedral and binary octahedral spaces as the observable spatial
topologies, we e... | [
{
"created": "Wed, 28 Dec 2005 12:14:21 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Apr 2006 10:58:19 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bento",
"M. C.",
""
],
[
"Bertolami",
"O.",
""
],
[
"Rebouças",
"M. J.",
""
],
[
"Silva",
"P. T.",
""
]
] | In this work we study to which extent the knowledge of spatial topology may place constraints on the parameters of the generalized Chaplygin gas (GCG) model for unification of dark energy and dark matter. By using both the Poincar\'e dodecahedral and binary octahedral spaces as the observable spatial topologies, we exa... |
1311.2874 | Zeeshan Yousaf | M. Sharif and Z. Yousaf | Expansion-free Cylindrically Symmetric Models | 16 pages | Can. J. Phys. 90(2012)865 | 10.1139/p2012-070 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper investigates cylindrically symmetric distribution of an-isotropic
fluid under the expansion-free condition, which requires the existence of
vacuum cavity within the fluid distribution. We have discussed two family of
solutions which further provide two exact models in each family. Some of these
solutions s... | [
{
"created": "Wed, 30 Oct 2013 14:59:14 GMT",
"version": "v1"
}
] | 2013-11-13 | [
[
"Sharif",
"M.",
""
],
[
"Yousaf",
"Z.",
""
]
] | This paper investigates cylindrically symmetric distribution of an-isotropic fluid under the expansion-free condition, which requires the existence of vacuum cavity within the fluid distribution. We have discussed two family of solutions which further provide two exact models in each family. Some of these solutions sat... |
1503.01487 | Dejan Stojkovic | Anshul Saini and Dejan Stojkovic | Radiation from a collapsing object is manifestly unitary | typos corrected, difference between various frequencies (\omega_0,
\bar{\omega}, \Omega) explained, plots updated, discussion expanded | Phys.Rev.Lett. 114 (2015) 11, 111301 | 10.1103/PhysRevLett.114.111301 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The process of gravitational collapse excites the fields propagating in the
background geometry and gives rise to thermal radiation. We demonstrate by
explicit calculations that the density matrix corresponding to such radiation
actually describes a pure state. While Hawking's leading order density matrix
contains on... | [
{
"created": "Wed, 4 Mar 2015 22:34:58 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Mar 2015 00:05:00 GMT",
"version": "v2"
},
{
"created": "Wed, 8 Apr 2015 03:00:42 GMT",
"version": "v3"
},
{
"created": "Mon, 28 Sep 2015 22:33:28 GMT",
"version": "v4"
}
] | 2015-09-30 | [
[
"Saini",
"Anshul",
""
],
[
"Stojkovic",
"Dejan",
""
]
] | The process of gravitational collapse excites the fields propagating in the background geometry and gives rise to thermal radiation. We demonstrate by explicit calculations that the density matrix corresponding to such radiation actually describes a pure state. While Hawking's leading order density matrix contains only... |
1708.07694 | Kirill Krasnov | Kirill Krasnov | Field redefinitions and Plebanski formalism for GR | 15 pages, no figures | null | 10.1088/1361-6382/aac844 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We point out that there exists a family of transformations acting on BF-type
Lagrangians of gravity, with Lagrangians related by such a transformation
corresponding to classically equivalent theories. A transformation of this type
corresponds to a particular field redefinition. We discuss both the chiral and
non-chir... | [
{
"created": "Fri, 25 Aug 2017 11:35:18 GMT",
"version": "v1"
}
] | 2018-07-11 | [
[
"Krasnov",
"Kirill",
""
]
] | We point out that there exists a family of transformations acting on BF-type Lagrangians of gravity, with Lagrangians related by such a transformation corresponding to classically equivalent theories. A transformation of this type corresponds to a particular field redefinition. We discuss both the chiral and non-chiral... |
2408.04672 | Jo\~ao Pedro Da Cruz Bravo Ferreira | Jo\~ao Pedro Bravo | f(R) Gravitation: Equivalence of Frames Upon a Conformal Transformation | 78 pages, 18 figures, MSc thesis, supervisors: Sergio E. Jor\'{a}s,
Ribamar R. R. Reis | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We investigate the behavior of the Ricci scalar in the Jordan (JF) and
Einstein (EF) frames, in the context of f(R) gravitation. We discuss the
physical equivalence of these two representations of the theory, which are
mathematically equivalent and whose metrics are connected by a conformal
transformation. We find th... | [
{
"created": "Wed, 7 Aug 2024 15:16:10 GMT",
"version": "v1"
}
] | 2024-08-12 | [
[
"Bravo",
"João Pedro",
""
]
] | We investigate the behavior of the Ricci scalar in the Jordan (JF) and Einstein (EF) frames, in the context of f(R) gravitation. We discuss the physical equivalence of these two representations of the theory, which are mathematically equivalent and whose metrics are connected by a conformal transformation. We find that... |
gr-qc/9907052 | M. B. Golubev | M.B.Golubev | Gravity Role in Classical Electrodynamics of Charged Point Source | 10 Russian Gravitational Conference, Report, 6 pages, LATEX | null | null | null | gr-qc | null | This paper deals with the problem of a point-like charged source under the
influence of the external electromagnetic field in terms of perturbation theory
for GR equations. It is obtained that GR, in contrast with the classical
electrodynamics, in linear perturbation theory predicts an unlimited growth of
the dipole ... | [
{
"created": "Wed, 14 Jul 1999 11:33:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Golubev",
"M. B.",
""
]
] | This paper deals with the problem of a point-like charged source under the influence of the external electromagnetic field in terms of perturbation theory for GR equations. It is obtained that GR, in contrast with the classical electrodynamics, in linear perturbation theory predicts an unlimited growth of the dipole pe... |
gr-qc/0405077 | Thomas W. Baumgarte | Thomas W. Baumgarte, Monica L. Skoge and Stuart L. Shapiro | Black Hole-Neutron Star Binaries in General Relativity: Quasiequilibrium
Formulation | 17 pages, 7 figures; added discussion, tables; PRD in press | Phys.Rev. D70 (2004) 064040 | 10.1103/PhysRevD.70.064040 | null | gr-qc astro-ph | null | We present a new numerical method for the construction of quasiequilibrium
models of black hole-neutron star binaries. We solve the constraint equations
of general relativity, decomposed in the conformal thin-sandwich formalism,
together with the Euler equation for the neutron star matter. We take the
system to be st... | [
{
"created": "Fri, 14 May 2004 20:00:39 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Jul 2004 19:27:18 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Baumgarte",
"Thomas W.",
""
],
[
"Skoge",
"Monica L.",
""
],
[
"Shapiro",
"Stuart L.",
""
]
] | We present a new numerical method for the construction of quasiequilibrium models of black hole-neutron star binaries. We solve the constraint equations of general relativity, decomposed in the conformal thin-sandwich formalism, together with the Euler equation for the neutron star matter. We take the system to be stat... |
1610.06690 | Sousuke Noda | Sousuke Noda, Yasusada Nambu, Masaaki Takahashi | Analog rotating black holes in a magnetohydrodynamic inflow | 17 pages, 5 figures, final version to match the published version | Phys. Rev. D 95, 104055 (2017) | 10.1103/PhysRevD.95.104055 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a model of the analog geometry in a magnetohydrodynamic (MHD)
flow. For the MHD flow with magnetic pressure-dominated and gas
pressure-dominated conditions, we obtain the magnetoacoustic metric for the
fast MHD mode. For the slow MHD mode, on the other hand, the wave is governed
by the advective-type equat... | [
{
"created": "Fri, 21 Oct 2016 07:39:14 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Oct 2016 01:33:48 GMT",
"version": "v2"
},
{
"created": "Wed, 1 Mar 2017 07:22:26 GMT",
"version": "v3"
},
{
"created": "Tue, 6 Jun 2017 23:34:30 GMT",
"version": "v4"
}
] | 2017-06-08 | [
[
"Noda",
"Sousuke",
""
],
[
"Nambu",
"Yasusada",
""
],
[
"Takahashi",
"Masaaki",
""
]
] | We present a model of the analog geometry in a magnetohydrodynamic (MHD) flow. For the MHD flow with magnetic pressure-dominated and gas pressure-dominated conditions, we obtain the magnetoacoustic metric for the fast MHD mode. For the slow MHD mode, on the other hand, the wave is governed by the advective-type equatio... |
gr-qc/0007010 | Peter Dunsby | Stacey Hobbs and Peter K. S. Dunsby | Dynamical Systems Approach to Magnetised Cosmological Perturbations | 15 pages RevTeX, 5 figures. Accepted for publication in Physical
Review D | Phys.Rev. D62 (2000) 124007 | 10.1103/PhysRevD.62.124007 | uct-cosmology-00/05 | gr-qc astro-ph | null | Assuming a large-scale homogeneous magnetic field, we follow the covariant
and gauge-invariant approach used by Tsagas and Barrow to describe the
evolution of density and magnetic field inhomogeneities and curvature
perturbations in a matter-radiation universe. We use a two parameter
approximation scheme to linearize... | [
{
"created": "Fri, 7 Jul 2000 19:01:39 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Aug 2000 14:59:39 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Hobbs",
"Stacey",
""
],
[
"Dunsby",
"Peter K. S.",
""
]
] | Assuming a large-scale homogeneous magnetic field, we follow the covariant and gauge-invariant approach used by Tsagas and Barrow to describe the evolution of density and magnetic field inhomogeneities and curvature perturbations in a matter-radiation universe. We use a two parameter approximation scheme to linearize t... |
1509.07976 | Shahram Jalalzadeh | M. Hashemi, S. Jalalzadeh and S. Vasheghani Farahani | The laws of thermodynamics and information for emergent cosmology | 10 pages, no figures, to appear in Gen. Rel. Grav | null | 10.1007/s10714-015-1971-8 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The aim here is to provide a set of equations for cosmology in terms of
information and thermodynamical parameters. The method we implement in order to
describe the universe is a development of Padmanabhan\rq{}s approach which is
based on the fact that emergence of the cosmic space is provided by the
evolution of the... | [
{
"created": "Sat, 26 Sep 2015 13:25:31 GMT",
"version": "v1"
}
] | 2015-11-04 | [
[
"Hashemi",
"M.",
""
],
[
"Jalalzadeh",
"S.",
""
],
[
"Farahani",
"S. Vasheghani",
""
]
] | The aim here is to provide a set of equations for cosmology in terms of information and thermodynamical parameters. The method we implement in order to describe the universe is a development of Padmanabhan\rq{}s approach which is based on the fact that emergence of the cosmic space is provided by the evolution of the c... |
1609.06944 | Tao Jun | Xiaobo Guo, Bochen Lv, Jun Tao, Peng Wang | Quantum Tunneling In Deformed Quantum Mechanics with Minimal Length | 16 pages, 5 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the deformed quantum mechanics with a minimal length, one WKB connection
formula through a turning point is derived. We then use it to calculate
tunnelling rates through potential barriers under the WKB approximation.
Finally, the minimal length effects on two examples of quantum tunneling in
nuclear and atomic ph... | [
{
"created": "Thu, 22 Sep 2016 12:45:47 GMT",
"version": "v1"
}
] | 2016-09-23 | [
[
"Guo",
"Xiaobo",
""
],
[
"Lv",
"Bochen",
""
],
[
"Tao",
"Jun",
""
],
[
"Wang",
"Peng",
""
]
] | In the deformed quantum mechanics with a minimal length, one WKB connection formula through a turning point is derived. We then use it to calculate tunnelling rates through potential barriers under the WKB approximation. Finally, the minimal length effects on two examples of quantum tunneling in nuclear and atomic phys... |
1703.06433 | Rafael A. Porto | Rafael A. Porto and Ira Z. Rothstein | On the Apparent Ambiguities in the Post-Newtonian Expansion for Binary
Systems | 12 pages. 1 figure. To appear in Phys. Rev. D | Phys. Rev. D 96, 024062 (2017) | 10.1103/PhysRevD.96.024062 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the source of the apparent ambiguities arising in the calculation
of the dynamics of binary black holes within the Post-Newtonian framework.
Divergences appear in both the near and far zone calculations, and may be of
either ultraviolet (UV) or infrared (IR) nature. The effective field theory
(EFT) formali... | [
{
"created": "Sun, 19 Mar 2017 13:19:59 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Jul 2017 14:52:53 GMT",
"version": "v2"
}
] | 2017-08-09 | [
[
"Porto",
"Rafael A.",
""
],
[
"Rothstein",
"Ira Z.",
""
]
] | We discuss the source of the apparent ambiguities arising in the calculation of the dynamics of binary black holes within the Post-Newtonian framework. Divergences appear in both the near and far zone calculations, and may be of either ultraviolet (UV) or infrared (IR) nature. The effective field theory (EFT) formalism... |
gr-qc/0012092 | Angelo Tartaglia | A. Tartaglia (Dip. Fisica, Politecnico, Torino and INFN Torino, Italy) | Gravitomagnetism, clocks and geometry | TCI Latex, 12 pages, 2 figures. To appear in European Journal of
Physics | null | 10.1088/0143-0807/22/2/301 | null | gr-qc | null | New techniques to evaluate the clock effect using light are described. These
are based on the flatness of the cylindrical surface containing the world lines
of the rays constrained to move on circular trajectories about a spinning mass.
The effect of the angular momentum of the source is manifested in the fact that
i... | [
{
"created": "Fri, 22 Dec 2000 14:41:31 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Tartaglia",
"A.",
"",
"Dip. Fisica, Politecnico, Torino and INFN Torino, Italy"
]
] | New techniques to evaluate the clock effect using light are described. These are based on the flatness of the cylindrical surface containing the world lines of the rays constrained to move on circular trajectories about a spinning mass. The effect of the angular momentum of the source is manifested in the fact that ine... |
gr-qc/9710051 | Robert Jantzen | Robert T Jantzen, Donato Bini, Paolo Carini | The Inertial Forces / Test Particle Motion Game | References corrected and updated, one equation (9) corrected, 22
pages, latex, 3 included pictex figures, needs World Scientific proceedings
style file mprocl.sty, and prepictex.tex, pictex.tex, postpictex.tex (all
available at http://xxx.lanl.gov), to appear in the Proceedings of the Eighth
Marcel Grossmann Me... | Proceedings of the Eighth Marcel Grossmann Meeting on General
Relativity, Tsvi Piran, Editor, World Scientific, Singapore, 1998, Vol. A,
pp. 376-397 | null | null | gr-qc | null | The somewhat fragmented body of current literature analyzing the properties
of test particle motion in static and stationary spacetimes and in general
spacetimes is pulled together and clarified using the framework of
gravitoelectromagnetism.
| [
{
"created": "Wed, 8 Oct 1997 16:10:35 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Aug 1998 19:39:18 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Jantzen",
"Robert T",
""
],
[
"Bini",
"Donato",
""
],
[
"Carini",
"Paolo",
""
]
] | The somewhat fragmented body of current literature analyzing the properties of test particle motion in static and stationary spacetimes and in general spacetimes is pulled together and clarified using the framework of gravitoelectromagnetism. |
1208.1523 | Lorenzo Iorio | Lorenzo Iorio | Local cosmological effects of the order of H in the orbital motion of a
binary system | LaTex, 8 pages, no figures, 4 tables. Version matching the one at
press in Monthly Notices of the Royal Astronomical Society (MNRAS) | Mon.Not.Roy.Astron.Soc.429:915-922,2013 | 10.1093/mnras/sts396 | null | gr-qc astro-ph.CO astro-ph.EP physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A two-body system hypothetically affected by an additional radial
acceleration H v_r, where v_r is the radial velocity of the binary's proper
orbital motion, would experience long-term temporal changes of both its
semimajor axis a and the eccentricity e qualitatively different from any other
standard competing effect... | [
{
"created": "Tue, 7 Aug 2012 20:53:33 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Aug 2012 13:32:16 GMT",
"version": "v2"
},
{
"created": "Mon, 12 Nov 2012 14:21:30 GMT",
"version": "v3"
},
{
"created": "Wed, 28 Nov 2012 15:51:00 GMT",
"version": "v4"
}
] | 2013-01-15 | [
[
"Iorio",
"Lorenzo",
""
]
] | A two-body system hypothetically affected by an additional radial acceleration H v_r, where v_r is the radial velocity of the binary's proper orbital motion, would experience long-term temporal changes of both its semimajor axis a and the eccentricity e qualitatively different from any other standard competing effect f... |
1605.03567 | Carsten van de Bruck | Carsten van de Bruck, Clare Burrage and Jack Morrice | Vacuum Cherenkov radiation and bremsstrahlung from disformal couplings | 17 pages, 3 figures; slight reordering of material and references
added | null | 10.1088/1475-7516/2016/08/003 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The simplest way to modify gravity is to extend the gravitational sector to
include an additional scalar degree of freedom. The most general metric that
can be built in such a theory includes disformal terms, so that standard model
fields move on a metric which is the sum of the space time metric and a tensor
constru... | [
{
"created": "Wed, 11 May 2016 18:09:36 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Jun 2016 14:25:31 GMT",
"version": "v2"
}
] | 2016-08-17 | [
[
"van de Bruck",
"Carsten",
""
],
[
"Burrage",
"Clare",
""
],
[
"Morrice",
"Jack",
""
]
] | The simplest way to modify gravity is to extend the gravitational sector to include an additional scalar degree of freedom. The most general metric that can be built in such a theory includes disformal terms, so that standard model fields move on a metric which is the sum of the space time metric and a tensor construct... |
0812.4430 | Roberto A. Sussman | Roberto A Sussman | Shear viscosity, relaxation and collision times in spherically symmetric
spacetimes | Invited contribution in "Casimir effect and Cosmology", special
volume on the occasion of 70th birthday of Prof. I. Brevik, collection of
articles, Odintsov, S. D., E.Elizalde and O.G. Gorbunova, -Scientific
Editors, TSPU Publishing Company, TSPU, Tomsk, single book, 2008. IOP LaTeX
style, 15 pages, 3 pdf figur... | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We interpret as shear viscosity the anisotropic pressure that emerges in
inhomogeneous spherically symmetric spacetimes described by the
Lemaitre-Tolman-Bondi (LTB) metric in a comoving frame. By assuming that local
isotropic pressure and energy density satisfy a generic ideal gas equation of
state, we reduce the fie... | [
{
"created": "Tue, 23 Dec 2008 17:17:27 GMT",
"version": "v1"
}
] | 2008-12-24 | [
[
"Sussman",
"Roberto A",
""
]
] | We interpret as shear viscosity the anisotropic pressure that emerges in inhomogeneous spherically symmetric spacetimes described by the Lemaitre-Tolman-Bondi (LTB) metric in a comoving frame. By assuming that local isotropic pressure and energy density satisfy a generic ideal gas equation of state, we reduce the field... |
2212.05542 | Tiberiu Harko | Jin-Zhao Yang, Shahab Shahidi, Tiberiu Harko | Black hole solutions in the quadratic Weyl conformal geometric theory of
gravity | 29 pages, 13 figures, accepted for publication in EPJC | null | 10.1140/epjc/s10052-022-11131-0 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider numerical black hole solutions in the Weyl conformal geometry,
and its associated conformally invariant Weyl quadratic gravity. In this model
Einstein gravity (with a positive cosmological constant) is recovered in the
spontaneously broken phase of Weyl gravity, after the Weyl gauge field ($\omega
_{\mu}$... | [
{
"created": "Sun, 11 Dec 2022 16:52:01 GMT",
"version": "v1"
}
] | 2023-01-18 | [
[
"Yang",
"Jin-Zhao",
""
],
[
"Shahidi",
"Shahab",
""
],
[
"Harko",
"Tiberiu",
""
]
] | We consider numerical black hole solutions in the Weyl conformal geometry, and its associated conformally invariant Weyl quadratic gravity. In this model Einstein gravity (with a positive cosmological constant) is recovered in the spontaneously broken phase of Weyl gravity, after the Weyl gauge field ($\omega _{\mu}$) ... |
1510.04656 | Alessio Belenchia | Alessio Belenchia, Dionigi M.T. Benincasa, Fay Dowker | The continuum limit of a 4-dimensional causal set scalar d'Alembertian | 31 pages, 2 figures. Slightly revised version, accepted for
publication in Classical and Quantum Gravity | null | 10.1088/0264-9381/33/24/245018 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The continuum limit of a 4-dimensional, discrete d'Alembertian operator for
scalar fields on causal sets is studied. The continuum limit of the mean of
this operator in the Poisson point process in 4-dimensional Minkowski spacetime
is shown to be the usual continuum scalar d'Alembertian $\Box$. It is shown
that the m... | [
{
"created": "Thu, 15 Oct 2015 18:30:53 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Oct 2016 13:37:57 GMT",
"version": "v2"
}
] | 2016-12-14 | [
[
"Belenchia",
"Alessio",
""
],
[
"Benincasa",
"Dionigi M. T.",
""
],
[
"Dowker",
"Fay",
""
]
] | The continuum limit of a 4-dimensional, discrete d'Alembertian operator for scalar fields on causal sets is studied. The continuum limit of the mean of this operator in the Poisson point process in 4-dimensional Minkowski spacetime is shown to be the usual continuum scalar d'Alembertian $\Box$. It is shown that the mea... |
gr-qc/0703020 | arXiv Admin | G. Felici | The meaning of systematic errors, a comment to "Reply to On the
Systematic Errors in the Detection of the Lense-Thirring Effect with a Mars
Orbiter", by Lorenzo Iorio | This submission has been removed because 'G. Felici' is an apparent
pseudonym, in violation of arXiv policies | null | null | null | gr-qc | null | This submission has been removed because 'G. Felici' is an apparent
pseudonym, in violation of arXiv policies.
| [
{
"created": "Sat, 3 Mar 2007 20:06:32 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Mar 2007 13:53:40 GMT",
"version": "v2"
},
{
"created": "Fri, 14 Feb 2014 15:43:57 GMT",
"version": "v3"
}
] | 2014-02-17 | [
[
"Felici",
"G.",
""
]
] | This submission has been removed because 'G. Felici' is an apparent pseudonym, in violation of arXiv policies. |
2304.02118 | Mykhailo Tataryn | Mykhailo Tataryn and Mykola Stetsko | Three-dimensional static black hole with $\Lambda$ and nonlinear
electromagnetic fields and its thermodynamics | null | International Journal of Modern Physics D. Vol. 28, 1950160 (2019) | 10.1142/S0218271819501608 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Static black hole with the Power Maxwell invariant (PMI), Born-Infeld (BI),
logarithmic (LN), exponential (EN) electromagnetic fields in three-dimensional
spacetime with cosmological constant was studied. It was shown that the LN and
EN fields represent the Born-Infeld type of nonlinear electrodynamics. It the
framew... | [
{
"created": "Tue, 4 Apr 2023 20:57:02 GMT",
"version": "v1"
}
] | 2023-04-06 | [
[
"Tataryn",
"Mykhailo",
""
],
[
"Stetsko",
"Mykola",
""
]
] | Static black hole with the Power Maxwell invariant (PMI), Born-Infeld (BI), logarithmic (LN), exponential (EN) electromagnetic fields in three-dimensional spacetime with cosmological constant was studied. It was shown that the LN and EN fields represent the Born-Infeld type of nonlinear electrodynamics. It the framewor... |
2010.13958 | Yacine Ali-Ha\"imoud | Yacine Ali-Ha\"imoud, Tristan L. Smith and Chiara M. F. Mingarelli | Insights into searches for anisotropies in the nanohertz
gravitational-wave background | 21 pages, 14 figures. Version accepted for publication in PRD after
minor changes | Phys. Rev. D 103, 042009 (2021) | 10.1103/PhysRevD.103.042009 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the next several years pulsar timing arrays (PTAs) are positioned to
detect the stochastic gravitational-wave background (GWB) likely produced by
the collection of inspiralling super-massive black holes binaries, and
potentially constrain some exotic physics. So far most of the pulsar timing
data analysis has ... | [
{
"created": "Mon, 26 Oct 2020 23:51:50 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Feb 2021 23:12:56 GMT",
"version": "v2"
}
] | 2021-02-24 | [
[
"Ali-Haïmoud",
"Yacine",
""
],
[
"Smith",
"Tristan L.",
""
],
[
"Mingarelli",
"Chiara M. F.",
""
]
] | Within the next several years pulsar timing arrays (PTAs) are positioned to detect the stochastic gravitational-wave background (GWB) likely produced by the collection of inspiralling super-massive black holes binaries, and potentially constrain some exotic physics. So far most of the pulsar timing data analysis has fo... |
1411.1843 | Farhad Ali Khan | Farhad Ali, Tooba Feroze | Approximate Noether Symmetries from Lagrangian for Plane Symmetric
Spacetimes | null | null | 10.1142/S0219887815501248 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/3.0/ | Noether symmetries from geodetic Lagrangian for time-conformal plane
symmetric spacetime are presented. Here, time conformal factor is used to find
the approximate Noether symmetries. This is a generalization of the idea
discussed by I. Hussain and A. Noether symmetries from geodetic Lagrangian for
time-conformal pla... | [
{
"created": "Fri, 7 Nov 2014 06:33:12 GMT",
"version": "v1"
}
] | 2015-11-04 | [
[
"Ali",
"Farhad",
""
],
[
"Feroze",
"Tooba",
""
]
] | Noether symmetries from geodetic Lagrangian for time-conformal plane symmetric spacetime are presented. Here, time conformal factor is used to find the approximate Noether symmetries. This is a generalization of the idea discussed by I. Hussain and A. Noether symmetries from geodetic Lagrangian for time-conformal plane... |
2108.05006 | Chi-Yong Lin | Tien Hsieh, Da-Shin Lee, and Chi-Yong Lin | Gravitational time delay effects by Kerr and Kerr-Newman black holes in
strong field limits | 33 pages, 5 figures. Revised version to appear in Physical Review D.
arXiv admin note: text overlap with arXiv:2101.09008 | null | 10.1103/PhysRevD.104.104013 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study the time delay between two relativistic images due to strong
gravitational lensing of the light rays caused by the Kerr and Kerr-Newman
black holes. The trajectories of the light rays are restricted on the
equatorial plane. Using the known form of the deflection angle in the strong
deflection limit (SDL) all... | [
{
"created": "Wed, 11 Aug 2021 03:21:31 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Sep 2021 01:44:29 GMT",
"version": "v2"
}
] | 2021-11-17 | [
[
"Hsieh",
"Tien",
""
],
[
"Lee",
"Da-Shin",
""
],
[
"Lin",
"Chi-Yong",
""
]
] | We study the time delay between two relativistic images due to strong gravitational lensing of the light rays caused by the Kerr and Kerr-Newman black holes. The trajectories of the light rays are restricted on the equatorial plane. Using the known form of the deflection angle in the strong deflection limit (SDL) allow... |
1604.06668 | Molin Liu | Molin Liu, Zonghua Zhao, Xiaohe You, Jianbo Lu, Lixin Xu | Test of the Weak Equivalence Principle using LIGO observations of
GW150914 and Fermi observations of GBM transient 150914 | 9 pages, 4 figures, accepted for publication in Physics Letters B | Physics Letters B 770 (2017) 8-15 | 10.1016/j.physletb.2017.04.033 | null | gr-qc astro-ph.GA astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | About 0.4s after the Laser Interferometer Gravitational-Wave Observatory
(LIGO) detected a transient gravitational-wave (GW) signal GW150914, the Fermi
Gamma-ray Burst Monitor (GBM) also found a weak electromagnetic transient (GBM
transient 150914). Time and location coincidences favor a possible association
between ... | [
{
"created": "Fri, 22 Apr 2016 14:08:15 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Apr 2016 06:16:08 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Apr 2017 10:27:24 GMT",
"version": "v3"
}
] | 2017-04-25 | [
[
"Liu",
"Molin",
""
],
[
"Zhao",
"Zonghua",
""
],
[
"You",
"Xiaohe",
""
],
[
"Lu",
"Jianbo",
""
],
[
"Xu",
"Lixin",
""
]
] | About 0.4s after the Laser Interferometer Gravitational-Wave Observatory (LIGO) detected a transient gravitational-wave (GW) signal GW150914, the Fermi Gamma-ray Burst Monitor (GBM) also found a weak electromagnetic transient (GBM transient 150914). Time and location coincidences favor a possible association between GW... |
1009.3292 | Valerio Ferroni | Valerio Ferroni and Alexander Silbergleit | Electrostatic Patch Effect in Cylindrical Geometry. I. Potential and
Energy between Slightly Non-Coaxial Cylinders | 26 pages, 1 Figure. Submitted to Classical and Quantum Gravity | Class.Quant.Grav.28:145001,2011 | 10.1088/0264-9381/28/14/145001 | null | gr-qc physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effect of any uneven voltage distribution on two close
cylindrical conductors with parallel axes that are slightly shifted in the
radial and by any length in the axial direction. The investigation is
especially motivated by certain precision measurements, such as the Satellite
Test of the Equivalence Pri... | [
{
"created": "Thu, 16 Sep 2010 22:00:40 GMT",
"version": "v1"
}
] | 2011-06-07 | [
[
"Ferroni",
"Valerio",
""
],
[
"Silbergleit",
"Alexander",
""
]
] | We study the effect of any uneven voltage distribution on two close cylindrical conductors with parallel axes that are slightly shifted in the radial and by any length in the axial direction. The investigation is especially motivated by certain precision measurements, such as the Satellite Test of the Equivalence Princ... |
2003.04303 | Daniel Sobral Blanco | Daniel Sobral-Blanco and Lucas Lombriser | A local self-tuning mechanism for the cosmological constant | 14 pages | Phys. Rev. D 102, 043506 (2020) | 10.1103/PhysRevD.102.043506 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently the global variation of the Planck mass in the General Relativistic
Einstein-Hilbert action was proposed as a self-tuning mechanism of the
cosmological constant preventing vacuum energy from freely gravitating. We show
that this global mechanism emerges for generic local scalar-tensor theories
with additiona... | [
{
"created": "Mon, 9 Mar 2020 17:59:09 GMT",
"version": "v1"
}
] | 2020-08-12 | [
[
"Sobral-Blanco",
"Daniel",
""
],
[
"Lombriser",
"Lucas",
""
]
] | Recently the global variation of the Planck mass in the General Relativistic Einstein-Hilbert action was proposed as a self-tuning mechanism of the cosmological constant preventing vacuum energy from freely gravitating. We show that this global mechanism emerges for generic local scalar-tensor theories with additional ... |
2308.03084 | Sarath Nelleri | Naseeba.K.M, Sarath Nelleri, Navaneeth Poonthottathil | Testing the dynamical stability and validity of generalized second law
within the phantom dynamical dark energy model | 18 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hubble constant($H_0$) tension and tension in the matter fluctuation
amplitude ($s_8$) are fascinating puzzles in cosmology nowadays. Phantom
dynamical dark energy model (PDDE), also known as little sibling of the big rip
is an abrupt event that can happen in the far future evolution of the universe.
Recent analysis ... | [
{
"created": "Sun, 6 Aug 2023 10:37:03 GMT",
"version": "v1"
}
] | 2023-08-08 | [
[
"M",
"Naseeba. K.",
""
],
[
"Nelleri",
"Sarath",
""
],
[
"Poonthottathil",
"Navaneeth",
""
]
] | Hubble constant($H_0$) tension and tension in the matter fluctuation amplitude ($s_8$) are fascinating puzzles in cosmology nowadays. Phantom dynamical dark energy model (PDDE), also known as little sibling of the big rip is an abrupt event that can happen in the far future evolution of the universe. Recent analysis of... |
1610.03281 | G\'abor Zsolt T\'oth | Gabor Zsolt Toth | Noether's theorems and conserved currents in gauge theories in the
presence of fixed fields | 28 pages, LaTeX, minor changes, journal reference added | Phys. Rev. D 96, 025018 (2017) | 10.1103/PhysRevD.96.025018 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the standard construction of conserved currents for matter fields
in general relativity to general gauge theories. In the original construction
the conserved current associated with a spacetime symmetry generated by a
Killing field $h^\mu$ is given by $\sqrt{-g}\,T^{\mu\nu}h_\nu$, where
$T^{\mu\nu}$ is the ... | [
{
"created": "Tue, 11 Oct 2016 11:37:19 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Oct 2016 08:37:00 GMT",
"version": "v2"
},
{
"created": "Thu, 27 Oct 2016 16:35:19 GMT",
"version": "v3"
},
{
"created": "Tue, 28 Mar 2017 16:20:54 GMT",
"version": "v4"
},
{
"c... | 2018-02-12 | [
[
"Toth",
"Gabor Zsolt",
""
]
] | We extend the standard construction of conserved currents for matter fields in general relativity to general gauge theories. In the original construction the conserved current associated with a spacetime symmetry generated by a Killing field $h^\mu$ is given by $\sqrt{-g}\,T^{\mu\nu}h_\nu$, where $T^{\mu\nu}$ is the en... |
1606.04361 | Jose Beltran Jimenez | Jose Beltran Jimenez | Cosmology with vector distortion | 4 pages, Contribution to the proceedings of the Cosmology session of
Moriond 2016 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider an extension of Weyl geometry with the most general connection
linearly determined by a vector field. We discuss some of the geometrical
properties within this framework and then we construct gravitational theories
leading to an interesting class of vector-tensor theories with cosmological
applications.
| [
{
"created": "Fri, 10 Jun 2016 09:00:15 GMT",
"version": "v1"
}
] | 2016-06-15 | [
[
"Jimenez",
"Jose Beltran",
""
]
] | We consider an extension of Weyl geometry with the most general connection linearly determined by a vector field. We discuss some of the geometrical properties within this framework and then we construct gravitational theories leading to an interesting class of vector-tensor theories with cosmological applications. |
1704.04426 | Cosimo Bambi | Hao Zhang, Menglei Zhou, Cosimo Bambi, Burkhard Kleihaus, Jutta Kunz,
Eugen Radu | Testing Einstein-dilaton-Gauss-Bonnet gravity from the reflection
spectrum of accreting black holes | 10 pages, 6 figures. v2: fixed some typos | Phys. Rev. D 95, 104043 (2017) | 10.1103/PhysRevD.95.104043 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Einstein-dilaton-Gauss-Bonnet gravity is a theoretically well-motivated
alternative theory of gravity emerging as a low-energy 4-dimensional model from
heterotic string theory. Its rotating black hole solutions are known
numerically and can have macroscopic deviations from the Kerr black holes of
Einstein's gravity. ... | [
{
"created": "Fri, 14 Apr 2017 14:10:01 GMT",
"version": "v1"
},
{
"created": "Tue, 30 May 2017 19:40:35 GMT",
"version": "v2"
}
] | 2017-06-01 | [
[
"Zhang",
"Hao",
""
],
[
"Zhou",
"Menglei",
""
],
[
"Bambi",
"Cosimo",
""
],
[
"Kleihaus",
"Burkhard",
""
],
[
"Kunz",
"Jutta",
""
],
[
"Radu",
"Eugen",
""
]
] | Einstein-dilaton-Gauss-Bonnet gravity is a theoretically well-motivated alternative theory of gravity emerging as a low-energy 4-dimensional model from heterotic string theory. Its rotating black hole solutions are known numerically and can have macroscopic deviations from the Kerr black holes of Einstein's gravity. Ei... |
2109.01075 | Ren Tsuda | Ren Tsuda and Takanori Fujiwara | Higher Dimensional Polytopal Universe in Regge Calculus | 29 pages, 12 figures | Prog Theor Exp Phys (2022) | 10.1093/ptep/ptac009 | null | gr-qc hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Higher dimensional closed Friedmann-Lema\^itre-Robertson-Walker (FLRW)
universe with positive cosmological constant is investigated by Regge calculus.
A Cauchy surface of discretized FLRW universe is replaced by a regular polytope
in accordance with the Collins-Williams (CW) formalism. Polytopes in an
arbitrary dimen... | [
{
"created": "Thu, 2 Sep 2021 16:42:24 GMT",
"version": "v1"
}
] | 2022-03-09 | [
[
"Tsuda",
"Ren",
""
],
[
"Fujiwara",
"Takanori",
""
]
] | Higher dimensional closed Friedmann-Lema\^itre-Robertson-Walker (FLRW) universe with positive cosmological constant is investigated by Regge calculus. A Cauchy surface of discretized FLRW universe is replaced by a regular polytope in accordance with the Collins-Williams (CW) formalism. Polytopes in an arbitrary dimensi... |
1602.03880 | Felipe J. Llanes-Estrada | Miguel Aparicio Resco, Alvaro de la Cruz-Dombriz, Felipe J.
Llanes-Estrada and Victor Zapatero Castrillo | On neutron stars in f(R) theories: small radii, large masses and large
energy emitted in a merger | 19 pages, 23 plots. Irrelevant paragraph deleted | Phys.Dark Univ. 13 (2016) 147-161 | 10.1016/j.dark.2016.07.001 | null | gr-qc astro-ph.CO nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of f(R) gravity theories, we show that the apparent mass of a
neutron star as seen from an observer at infinity is numerically calculable but
requires careful matching, first at the star's edge, between interior and
exterior solutions, none of them being totally Schwarzschild-like but
presenting instea... | [
{
"created": "Thu, 11 Feb 2016 20:51:11 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Feb 2016 17:12:45 GMT",
"version": "v2"
},
{
"created": "Wed, 20 Jul 2016 15:36:27 GMT",
"version": "v3"
},
{
"created": "Tue, 13 Sep 2016 08:06:55 GMT",
"version": "v4"
}
] | 2016-09-14 | [
[
"Resco",
"Miguel Aparicio",
""
],
[
"de la Cruz-Dombriz",
"Alvaro",
""
],
[
"Llanes-Estrada",
"Felipe J.",
""
],
[
"Castrillo",
"Victor Zapatero",
""
]
] | In the context of f(R) gravity theories, we show that the apparent mass of a neutron star as seen from an observer at infinity is numerically calculable but requires careful matching, first at the star's edge, between interior and exterior solutions, none of them being totally Schwarzschild-like but presenting instead ... |
1509.05174 | Ozay Gurtug | O. Gurtug and M. Halilsoy | Wavy way to the Kerr metric and the quantum nature of its ring
singularity | 18 pages, 2 figures, Title has been changed and explanations have
been improved | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | From inherent non-linearity two gravitational waves, unless they are
unidirectional, fail to satisfy a superposition law. They collide to develop a
new spacetime carrying the imprints of the incoming waves. Same behaviour is
valid also for any massless lightlike field. As a result of the violent
collision process eit... | [
{
"created": "Thu, 17 Sep 2015 09:09:03 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Mar 2016 09:50:06 GMT",
"version": "v2"
}
] | 2016-03-17 | [
[
"Gurtug",
"O.",
""
],
[
"Halilsoy",
"M.",
""
]
] | From inherent non-linearity two gravitational waves, unless they are unidirectional, fail to satisfy a superposition law. They collide to develop a new spacetime carrying the imprints of the incoming waves. Same behaviour is valid also for any massless lightlike field. As a result of the violent collision process eithe... |
gr-qc/0105088 | Mikhail Sheftel B. | Y. Nutku (deceased) and M. B. Sheftel | A family of heavenly metrics | minor changes, correction to formula (29), 16 pages | null | null | null | gr-qc math-ph math.MP nlin.SI | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is a corrected and essentially extended version of the previous preprint
arXiv:gr-qc/0105088 v4 (2002) by Y. Nutku and M. Sheftel containing new
results. It is being published now in honor of Y. Nutku's memory. All
responsibility for the additions and changes must be attributed to M. Sheftel.
We present new anti... | [
{
"created": "Thu, 24 May 2001 14:35:38 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Jun 2001 12:13:29 GMT",
"version": "v2"
},
{
"created": "Tue, 8 Oct 2002 13:42:41 GMT",
"version": "v3"
},
{
"created": "Wed, 9 Oct 2002 11:03:03 GMT",
"version": "v4"
},
{
"crea... | 2013-12-11 | [
[
"Nutku",
"Y.",
"",
"deceased"
],
[
"Sheftel",
"M. B.",
""
]
] | This is a corrected and essentially extended version of the previous preprint arXiv:gr-qc/0105088 v4 (2002) by Y. Nutku and M. Sheftel containing new results. It is being published now in honor of Y. Nutku's memory. All responsibility for the additions and changes must be attributed to M. Sheftel. We present new anti-s... |
1712.09353 | Seokcheon Lee | Young-Hwan Hyun, Yoonbai Kim, and Seokcheon Lee | Conformal Frame dependence on Cosmological Observations in Scalar-Tensor
Theories of Gravity | 14 pages, 5 figures | J. Korean Phys. Soc. (2019) 74 : 1101 | 10.3938/jkps.74.1101 | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmological observations provide more accurate values both for background
evolution of the Universe and for the structure formation. These values are
given by the so-called dark energy equation of state, $\omega$ and the growth
index parameter, $\gamma$. From these observed parameters, one can reconstruct
the model ... | [
{
"created": "Tue, 26 Dec 2017 07:36:51 GMT",
"version": "v1"
}
] | 2019-07-01 | [
[
"Hyun",
"Young-Hwan",
""
],
[
"Kim",
"Yoonbai",
""
],
[
"Lee",
"Seokcheon",
""
]
] | Cosmological observations provide more accurate values both for background evolution of the Universe and for the structure formation. These values are given by the so-called dark energy equation of state, $\omega$ and the growth index parameter, $\gamma$. From these observed parameters, one can reconstruct the model fu... |
2403.00883 | Rahul Mapari Dr. | V. R. Patil, J. L. Pawde, R. V. Mapari, and S. K. Waghmare | Energy Conditions in f(R, T) Gravity with an Anisotropic Background | 19 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In our study, we explored the properties of a spatially homogeneous and
anisotropic Bianchi type V I0 Universe. Our investigation centered on
integrating cosmic domain walls into the f(R, T) theory of gravitation,
initially proposed by Harko et al. in 2011. To tackle the field equations, we
employed the relationship ... | [
{
"created": "Fri, 1 Mar 2024 09:37:07 GMT",
"version": "v1"
}
] | 2024-03-05 | [
[
"Patil",
"V. R.",
""
],
[
"Pawde",
"J. L.",
""
],
[
"Mapari",
"R. V.",
""
],
[
"Waghmare",
"S. K.",
""
]
] | In our study, we explored the properties of a spatially homogeneous and anisotropic Bianchi type V I0 Universe. Our investigation centered on integrating cosmic domain walls into the f(R, T) theory of gravitation, initially proposed by Harko et al. in 2011. To tackle the field equations, we employed the relationship be... |
0806.2966 | Jiri Podolsky | Jiri Podolsky | Photon rockets in (anti-)de Sitter universe | 8 pages. To appear in Phys. Rev. D | Phys.Rev.D78:044029,2008 | 10.1103/PhysRevD.78.044029 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A class of exact solutions of Einstein's equations is presented which
describes accelerating photon rockets in de Sitter and anti-de Sitter universe.
These are particular members of the Robinson-Trautman family of axially
symmetric spacetimes with pure radiation. In particular, generalizations of
(type D) Kinnersley'... | [
{
"created": "Wed, 18 Jun 2008 11:22:49 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Podolsky",
"Jiri",
""
]
] | A class of exact solutions of Einstein's equations is presented which describes accelerating photon rockets in de Sitter and anti-de Sitter universe. These are particular members of the Robinson-Trautman family of axially symmetric spacetimes with pure radiation. In particular, generalizations of (type D) Kinnersley's ... |
2310.08667 | Andrea Calcinari | Andrea Calcinari and Steffen Gielen | Generalised Gaussian states in group field theory and
$\mathfrak{su(1,1)}$ quantum cosmology | 27 pages, 3 figures; v2: title, abstract and other minor changes to
match published version | Phys. Rev. D 109 (2024), 066022 | 10.1103/PhysRevD.109.066022 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We define generalised Gaussian states for quantum cosmological models based
on the $\mathfrak{su(1,1)}$ algebra, with particular emphasis on its
realisation in group field theory for a single field mode, and study their
semiclassical properties. These states are generalisations of coherent,
squeezed and thermal state... | [
{
"created": "Thu, 12 Oct 2023 18:59:03 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Mar 2024 12:30:28 GMT",
"version": "v2"
}
] | 2024-03-26 | [
[
"Calcinari",
"Andrea",
""
],
[
"Gielen",
"Steffen",
""
]
] | We define generalised Gaussian states for quantum cosmological models based on the $\mathfrak{su(1,1)}$ algebra, with particular emphasis on its realisation in group field theory for a single field mode, and study their semiclassical properties. These states are generalisations of coherent, squeezed and thermal states ... |
2204.02244 | Michael Bradley | Philip Semr\'en, Michael Bradley | General Perturbations of Homogeneous and Orthogonal Locally Rotationally
Symmetric Class II Cosmologies with Applications to Dissipative Fluids | 27 pages, 1 figure | null | 10.1088/1361-6382/ac9bc7 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | First order perturbations of homogeneous and hypersurface orthogonal LRS
(Locally Rotationally Symmetric) class II cosmologies with a cosmological
constant are considered in the framework of the 1+1+2 covariant decomposition
of spacetime. The perturbations, which are for a general energy-momentum
tensor, include scal... | [
{
"created": "Tue, 5 Apr 2022 14:32:15 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Apr 2022 14:55:43 GMT",
"version": "v2"
}
] | 2022-11-23 | [
[
"Semrén",
"Philip",
""
],
[
"Bradley",
"Michael",
""
]
] | First order perturbations of homogeneous and hypersurface orthogonal LRS (Locally Rotationally Symmetric) class II cosmologies with a cosmological constant are considered in the framework of the 1+1+2 covariant decomposition of spacetime. The perturbations, which are for a general energy-momentum tensor, include scalar... |
2206.06756 | Avijit Chowdhury | Avijit Chowdhury, Semin Xavier and S. Shankaranarayanan (IIT Bombay) | The dominating mode of two competing massive modes of quadratic gravity | To appear in Nature Scientific Reports | Sci Rep 13, 8547 (2023) | 10.1038/s41598-023-34802-8 | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | Over the last two decades, motivations for modified gravity have emerged from
both theoretical and observational levels. $f(R)$ and Chern-Simons gravity have
received more attention as they are the simplest generalization. However,
$f(R)$ and Chern-Simons gravity contain only an additional scalar (spin-0)
degree of f... | [
{
"created": "Tue, 14 Jun 2022 11:08:41 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Dec 2022 14:54:02 GMT",
"version": "v2"
},
{
"created": "Wed, 24 May 2023 17:46:51 GMT",
"version": "v3"
}
] | 2023-05-29 | [
[
"Chowdhury",
"Avijit",
"",
"IIT Bombay"
],
[
"Xavier",
"Semin",
"",
"IIT Bombay"
],
[
"Shankaranarayanan",
"S.",
"",
"IIT Bombay"
]
] | Over the last two decades, motivations for modified gravity have emerged from both theoretical and observational levels. $f(R)$ and Chern-Simons gravity have received more attention as they are the simplest generalization. However, $f(R)$ and Chern-Simons gravity contain only an additional scalar (spin-0) degree of fre... |
2309.00319 | Vittorio De Falco Dr | Vittorio De Falco, Emmanuele Battista | Analytical results for binary dynamics at the first post-Newtonian order
in Einstein-Cartan theory with the Weyssenhoff fluid | 13 pages, 2 figures, accepted for pubblication on Phys. Rev. D | null | 10.1103/PhysRevD.108.064032 | null | gr-qc hep-th math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | The quantum spin effects inside matter can be modeled via the Weyssenhoff
fluid, which permits to unearth a formal analogy between general relativity and
Einstein-Cartan theory at the first post-Newtonian order. In this framework, we
provide some analytical formulas pertaining to the dynamics of binary systems
having... | [
{
"created": "Fri, 1 Sep 2023 08:07:27 GMT",
"version": "v1"
}
] | 2023-09-20 | [
[
"De Falco",
"Vittorio",
""
],
[
"Battista",
"Emmanuele",
""
]
] | The quantum spin effects inside matter can be modeled via the Weyssenhoff fluid, which permits to unearth a formal analogy between general relativity and Einstein-Cartan theory at the first post-Newtonian order. In this framework, we provide some analytical formulas pertaining to the dynamics of binary systems having t... |
1805.07692 | Chiang-Mei Chen | Chiang-Mei Chen, Jian-Liang Liu, James M. Nester | Gravitational energy is well defined | 7 pages, Honorable Mention in the 2018 Essay Competition of the
Gravity Research Foundation | Int. J. Mod. Phys. D27 (2018) 1847017 | 10.1142/S021827181847017X | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The energy of gravitating systems has been an issue since Einstein proposed
general relativity: considered to be ill defined, having no proper local
density. Energy-momentum is now regarded as \emph{quasi-local} (associated with
a closed 2-surface). We consider the pseudotensor and quasi-local proposals in
the Lagran... | [
{
"created": "Sun, 20 May 2018 02:22:44 GMT",
"version": "v1"
}
] | 2018-11-15 | [
[
"Chen",
"Chiang-Mei",
""
],
[
"Liu",
"Jian-Liang",
""
],
[
"Nester",
"James M.",
""
]
] | The energy of gravitating systems has been an issue since Einstein proposed general relativity: considered to be ill defined, having no proper local density. Energy-momentum is now regarded as \emph{quasi-local} (associated with a closed 2-surface). We consider the pseudotensor and quasi-local proposals in the Lagrangi... |
gr-qc/0301013 | L. C. Garcia de Andrade | L.C. Garcia de Andrade | On non-Riemannian geometry of superfluids | Latex file | null | null | null | gr-qc | null | The Gross-Pitaevski (GP) equation describing helium superfluids is extended
to non-Riemannian spacetime background where torsion is shown to induce the
splitting in the potential energy of the flow. A cylindrically symmetric
solution for Minkowski background with constant torsion is obtained which shows
that torsion ... | [
{
"created": "Sun, 5 Jan 2003 22:32:34 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"de Andrade",
"L. C. Garcia",
""
]
] | The Gross-Pitaevski (GP) equation describing helium superfluids is extended to non-Riemannian spacetime background where torsion is shown to induce the splitting in the potential energy of the flow. A cylindrically symmetric solution for Minkowski background with constant torsion is obtained which shows that torsion in... |
gr-qc/0203078 | Brien C. Nolan | Brien C. Nolan and Filipe C. Mena | Geometry and topology of singularities in spherical dust collapse | 12 pages. To appear in Classical and Quantum Gravity | Class.Quant.Grav.19:2587-2606,2002 | 10.1088/0264-9381/19/10/305 | null | gr-qc | null | We derive some more results on the nature of the singularities arising in the
collapse of inhomogeneous dust spheres. (i) It is shown that there are
future-pointing radial and non-radial time-like geodesics emerging from the
singularity if and only if there are future-pointing radial null geodesics
emerging from the ... | [
{
"created": "Fri, 22 Mar 2002 17:22:42 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Nolan",
"Brien C.",
""
],
[
"Mena",
"Filipe C.",
""
]
] | We derive some more results on the nature of the singularities arising in the collapse of inhomogeneous dust spheres. (i) It is shown that there are future-pointing radial and non-radial time-like geodesics emerging from the singularity if and only if there are future-pointing radial null geodesics emerging from the si... |
1404.0663 | Xihao Deng | Xihao Deng | Searching for Gravitational Wave Bursts via Bayesian Nonparametric Data
Analysis with Pulsar Timing Arrays | 30 pages, 9 figures, submitted to Physical Review D. arXiv admin
note: text overlap with arXiv:1004.3499 by other authors | Physical Review D, 90, 024020, 2014 | 10.1103/PhysRevD.90.024020 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational wave burst is a catch-all category for signals whose durations
are shorter than the observation period. We apply a method new to gravitational
wave data analysis --- Bayesian non-parameterics --- to the problem of
gravitational wave detection, with an emphasis on pulsar timing array
observations. In Bay... | [
{
"created": "Wed, 2 Apr 2014 19:41:22 GMT",
"version": "v1"
},
{
"created": "Fri, 30 May 2014 01:17:21 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Deng",
"Xihao",
""
]
] | Gravitational wave burst is a catch-all category for signals whose durations are shorter than the observation period. We apply a method new to gravitational wave data analysis --- Bayesian non-parameterics --- to the problem of gravitational wave detection, with an emphasis on pulsar timing array observations. In Bayes... |
1901.04486 | David Garfinkle | David Garfinkle | On "the'' electric field of a uniformly accelerating charge | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The problem of the electric field of a uniformly accelerating charge is a
longstanding one that has led to several issues. We resolve these issues using
techniques from linguistics, cognitive psychology, and the mathematics of
partial differential equations.
| [
{
"created": "Mon, 14 Jan 2019 18:30:23 GMT",
"version": "v1"
}
] | 2019-01-16 | [
[
"Garfinkle",
"David",
""
]
] | The problem of the electric field of a uniformly accelerating charge is a longstanding one that has led to several issues. We resolve these issues using techniques from linguistics, cognitive psychology, and the mathematics of partial differential equations. |
gr-qc/0501054 | Frank L\"offler | Ian Hawke, Frank L\"offler, Andrea Nerozzi | Excision methods for high resolution shock capturing schemes applied to
general relativistic hydrodynamics | 13 pages, 6 figures | Phys.Rev. D71 (2005) 104006 | 10.1103/PhysRevD.71.104006 | AEI-2005-002 | gr-qc | null | We present a simple method for applying excision boundary conditions for the
relativistic Euler equations. This method depends on the use of
Reconstruction-Evolution methods, a standard class of HRSC methods. We test
three different reconstruction schemes, namely TVD, PPM and ENO. The method
does not require that the... | [
{
"created": "Tue, 18 Jan 2005 12:45:21 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Hawke",
"Ian",
""
],
[
"Löffler",
"Frank",
""
],
[
"Nerozzi",
"Andrea",
""
]
] | We present a simple method for applying excision boundary conditions for the relativistic Euler equations. This method depends on the use of Reconstruction-Evolution methods, a standard class of HRSC methods. We test three different reconstruction schemes, namely TVD, PPM and ENO. The method does not require that the c... |
0906.5568 | Charmousis | C. Charmousis, T. Kolyvaris and E. Papantonopoulos | Charged C-metric with conformally coupled scalar field | regular article, no figures, typos corrected, to appear in Classical
and Quantum Gravity | Class.Quant.Grav.26:175012,2009 | 10.1088/0264-9381/26/17/175012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a generalisation of the charged C-metric conformally coupled with
a scalar field in the presence of a cosmological constant. The solution is
asymptotically flat or a constant curvature spacetime. The spacetime metric has
the geometry of a usual charged C-metric with cosmological constant, where the
mass an... | [
{
"created": "Tue, 30 Jun 2009 19:29:15 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Aug 2009 19:24:03 GMT",
"version": "v2"
}
] | 2009-09-29 | [
[
"Charmousis",
"C.",
""
],
[
"Kolyvaris",
"T.",
""
],
[
"Papantonopoulos",
"E.",
""
]
] | We present a generalisation of the charged C-metric conformally coupled with a scalar field in the presence of a cosmological constant. The solution is asymptotically flat or a constant curvature spacetime. The spacetime metric has the geometry of a usual charged C-metric with cosmological constant, where the mass and ... |
1505.03647 | Jing-Bo Wang | Jingbo Wang and Chao-Guang Huang | BF theory explanation of the entropy for rotating isolated horizons | 8 pages, no figures | Int. J. Mod. Phys.D 25,1650100 (2016) | 10.1142/S0218271816501005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, the isolated horizons with rotation are considered. It is
shown that the symplectic form is the same as that in the nonrotating case. As
a result, the boundary degrees of freedom can be also described by an SO$(1,1)$
BF theory. The entropy satisfies the Bekenstein-Hawking area law with the same
Barbero... | [
{
"created": "Thu, 14 May 2015 08:25:09 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Jul 2016 00:36:33 GMT",
"version": "v2"
}
] | 2016-07-06 | [
[
"Wang",
"Jingbo",
""
],
[
"Huang",
"Chao-Guang",
""
]
] | In this paper, the isolated horizons with rotation are considered. It is shown that the symplectic form is the same as that in the nonrotating case. As a result, the boundary degrees of freedom can be also described by an SO$(1,1)$ BF theory. The entropy satisfies the Bekenstein-Hawking area law with the same Barbero-I... |
gr-qc/0309068 | Takashi Tamaki | Takashi Tamaki (Kyoto University), Nobuyuki Sakai (Yamagata
University) | Properties of global monopoles with an event horizon | 5 pages, 7 figures | Phys.Rev. D69 (2004) 044018 | 10.1103/PhysRevD.69.044018 | null | gr-qc astro-ph hep-ph | null | We investigate the properties of global monopoles with an event horizon. We
find that there is an unstable circular orbit even if a particle does not have
an angular momentum when the core mass is negative. We also obtain the
asymptotic form of solutions when the event horizon is much larger than the
core radius of t... | [
{
"created": "Sun, 14 Sep 2003 05:34:40 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Sep 2003 05:09:24 GMT",
"version": "v2"
}
] | 2016-08-31 | [
[
"Tamaki",
"Takashi",
"",
"Kyoto University"
],
[
"Sakai",
"Nobuyuki",
"",
"Yamagata\n University"
]
] | We investigate the properties of global monopoles with an event horizon. We find that there is an unstable circular orbit even if a particle does not have an angular momentum when the core mass is negative. We also obtain the asymptotic form of solutions when the event horizon is much larger than the core radius of the... |
1809.06841 | Sohyun Park | Sohyun Park, R. P. Woodard | Do the Spirits Rise? | 20 pages, 7 figures, v2: revised for publication | Phys. Rev. D 99, 024014 (2019) | 10.1103/PhysRevD.99.024014 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A nonlocal gravity model based on $\frac1{\square} R$ achieves the
phenomenological goals of generating cosmic acceleration without dark energy
and of suppressing the growth of perturbations compared to the $\Lambda$CDM
model. Although the localized version of this model possesses a scalar ghost,
the nonlocal version... | [
{
"created": "Tue, 18 Sep 2018 17:43:15 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Jan 2019 16:14:05 GMT",
"version": "v2"
}
] | 2019-01-16 | [
[
"Park",
"Sohyun",
""
],
[
"Woodard",
"R. P.",
""
]
] | A nonlocal gravity model based on $\frac1{\square} R$ achieves the phenomenological goals of generating cosmic acceleration without dark energy and of suppressing the growth of perturbations compared to the $\Lambda$CDM model. Although the localized version of this model possesses a scalar ghost, the nonlocal version d... |
1902.09769 | Andreas Finke | Andreas Finke | The perturbed FLRW metric on all scales: Newtonian limit and top-hat
collapse | couple of useful clarifications; agrees with published version | Monthly Notices of the Royal Astronomical Society, Volume 491,
Issue 2, January 2020 | 10.1093/mnras/stz3145 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The applicability of a linearized perturbed FLRW metric to the late, lumpy
universe has been subject to debate. We consider in an elementary way the
Newtonian limit of the Einstein equations with this ansatz for the case of
structure formation in late-time cosmology, on small and large scales, and
argue that lineariz... | [
{
"created": "Tue, 26 Feb 2019 07:18:22 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jul 2019 12:17:01 GMT",
"version": "v2"
},
{
"created": "Tue, 17 Dec 2019 10:29:38 GMT",
"version": "v3"
}
] | 2019-12-18 | [
[
"Finke",
"Andreas",
""
]
] | The applicability of a linearized perturbed FLRW metric to the late, lumpy universe has been subject to debate. We consider in an elementary way the Newtonian limit of the Einstein equations with this ansatz for the case of structure formation in late-time cosmology, on small and large scales, and argue that linearizin... |
1506.00989 | Barun Kumar Pal Dr. | Barun Kumar Pal | Theoretical and observational aspects of cosmological inflation | PHD thesis defended on 20/11/2014 at Jadavpur University, 124 Pages
and 22 Figures. arXiv admin note: text overlap with arXiv:0906.0664,
arXiv:hep-ph/0210162 by other authors | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This thesis piles up the results of five works in the field of cosmological
inflation, inflationary cosmological perturbations, cosmic microwave
background(CMB) and weak gravitational lensing of cosmic microwave background.
| [
{
"created": "Tue, 2 Jun 2015 19:09:19 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Pal",
"Barun Kumar",
""
]
] | This thesis piles up the results of five works in the field of cosmological inflation, inflationary cosmological perturbations, cosmic microwave background(CMB) and weak gravitational lensing of cosmic microwave background. |
2404.18288 | Wei-Liang Qian | Shui-Fa Shen, Wei-Liang Qian, Jie Zhang, Yu Pan, Yu-Peng Yan,
Cheng-Gang Shao | Matrix method and the suppression of Runge's phenomenon | 17 pages, 4 figures and 4 tables | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Higher-degree polynomial interpolations carried out on uniformly distributed
nodes are often plagued by {\it overfitting}, known as Runge's phenomenon. This
work investigates Runge's phenomenon and its suppression in various versions of
the matrix method for black hole quasinormal modes. It is shown that an
appropria... | [
{
"created": "Sun, 28 Apr 2024 19:28:55 GMT",
"version": "v1"
}
] | 2024-04-30 | [
[
"Shen",
"Shui-Fa",
""
],
[
"Qian",
"Wei-Liang",
""
],
[
"Zhang",
"Jie",
""
],
[
"Pan",
"Yu",
""
],
[
"Yan",
"Yu-Peng",
""
],
[
"Shao",
"Cheng-Gang",
""
]
] | Higher-degree polynomial interpolations carried out on uniformly distributed nodes are often plagued by {\it overfitting}, known as Runge's phenomenon. This work investigates Runge's phenomenon and its suppression in various versions of the matrix method for black hole quasinormal modes. It is shown that an appropriate... |
2107.11497 | Raphael Wittkowski | Michael te Vrugt, Sabine Hossenfelder, Raphael Wittkowski | Mori-Zwanzig formalism for general relativity: a new approach to the
averaging problem | 7 pages, 1 figure | Physical Review Letters 127, 231101 (2021) | 10.1103/PhysRevLett.127.231101 | null | gr-qc astro-ph.CO cond-mat.stat-mech hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmology relies on a coarse-grained description of the universe, assumed to
be valid on large length scales. However, the nonlinearity of general
relativity makes coarse-graining extremely difficult. We here address this
problem by extending the Mori-Zwanzig projection operator formalism, a highly
successful coarse-... | [
{
"created": "Sat, 24 Jul 2021 00:51:00 GMT",
"version": "v1"
}
] | 2021-12-07 | [
[
"Vrugt",
"Michael te",
""
],
[
"Hossenfelder",
"Sabine",
""
],
[
"Wittkowski",
"Raphael",
""
]
] | Cosmology relies on a coarse-grained description of the universe, assumed to be valid on large length scales. However, the nonlinearity of general relativity makes coarse-graining extremely difficult. We here address this problem by extending the Mori-Zwanzig projection operator formalism, a highly successful coarse-gr... |
1512.06497 | Ryotaro Kase | Ryotaro Kase, Shinji Tsujikawa and Antonio De Felice | Conical singularities and the Vainshtein screening in full GLPV theories | 25 pages, 1 figure | JCAP03(2016)003 | 10.1088/1475-7516/2016/03/003 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In Gleyzes-Langlois-Piazza-Vernizzi (GLPV) theories, it is known that the
conical singularity arises at the center of a spherically symmetric body
($r=0$) in the case where the parameter $\alpha_{{\rm H}4}$ characterizing the
deviation from the Horndeski Lagrangian $L_4$ approaches a non-zero constant as
$r \to 0$. W... | [
{
"created": "Mon, 21 Dec 2015 05:17:16 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Mar 2016 05:34:49 GMT",
"version": "v2"
}
] | 2016-03-03 | [
[
"Kase",
"Ryotaro",
""
],
[
"Tsujikawa",
"Shinji",
""
],
[
"De Felice",
"Antonio",
""
]
] | In Gleyzes-Langlois-Piazza-Vernizzi (GLPV) theories, it is known that the conical singularity arises at the center of a spherically symmetric body ($r=0$) in the case where the parameter $\alpha_{{\rm H}4}$ characterizing the deviation from the Horndeski Lagrangian $L_4$ approaches a non-zero constant as $r \to 0$. We ... |
gr-qc/0511045 | Ignacio Navarro | Ignacio Navarro and Karel Van Acoleyen | Consistent long distance modification of gravity from inverse powers of
the curvature | 27 pages, 1 figure, v2. references added, improved discussion | JCAP 0603 (2006) 008 | 10.1088/1475-7516/2006/03/008 | DAMTP-2005-105, DCPT/05/142, IPPP/05/71 | gr-qc astro-ph hep-th | null | In this paper we study long distance modifications of gravity obtained by
considering actions that are singular in the limit of vanishing curvature. In
particular, we showed in a previous publication that models that include
inverse powers of curvature invariants that diverge for r->0 in the
Schwarzschild geometry, r... | [
{
"created": "Wed, 9 Nov 2005 19:16:35 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Dec 2005 20:02:21 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Navarro",
"Ignacio",
""
],
[
"Van Acoleyen",
"Karel",
""
]
] | In this paper we study long distance modifications of gravity obtained by considering actions that are singular in the limit of vanishing curvature. In particular, we showed in a previous publication that models that include inverse powers of curvature invariants that diverge for r->0 in the Schwarzschild geometry, rec... |
1306.3164 | Mehrdad Farhoudi Prof. | Hamid Shabani and Mehrdad Farhoudi | f(R,T) Cosmological Models in Phase Space | 30 pages, many figures, some corrections made, Refs. added | Phys. Rev. D 88, 044048 (2013) | 10.1103/PhysRevD.88.044048 | null | gr-qc astro-ph.CO hep-th math-ph math.MP physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate cosmological solutions of f(R,T) modified theories of gravity
for perfect fluid in spatially FLRW metric through phase space analysis, where
R is Ricci scalar and T denotes the trace of energy-momentum tensor of matter
content. We explore and analyze three general theories with Lagrangians of
minimal $... | [
{
"created": "Thu, 13 Jun 2013 16:55:24 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jun 2013 17:53:48 GMT",
"version": "v2"
},
{
"created": "Sat, 3 Aug 2013 13:30:50 GMT",
"version": "v3"
},
{
"created": "Mon, 19 Aug 2013 13:15:53 GMT",
"version": "v4"
}
] | 2017-05-23 | [
[
"Shabani",
"Hamid",
""
],
[
"Farhoudi",
"Mehrdad",
""
]
] | We investigate cosmological solutions of f(R,T) modified theories of gravity for perfect fluid in spatially FLRW metric through phase space analysis, where R is Ricci scalar and T denotes the trace of energy-momentum tensor of matter content. We explore and analyze three general theories with Lagrangians of minimal $g(... |
1509.06316 | Andrzej Krasi\'nski | Andrzej Krasi\'nski | Cosmological blueshifting may explain the gamma ray bursts | 23 pages, 18 figures. Typos corrected, title and two sentences in the
abstract modified, bibliography updated. The present text matches the
published version | Phys. Rev. D 93, 043525 (2016) | 10.1103/PhysRevD.93.043525 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that the basic observed properties of the gamma-ray bursts (GRBs)
are accounted for if one assumes that the GRBs arise by blueshifting the
emission radiation of hydrogen and helium generated during the last scattering
epoch. The blueshift generator for a single GRB is a region with a nonconstant
bang-time... | [
{
"created": "Mon, 21 Sep 2015 17:28:36 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Feb 2016 15:01:24 GMT",
"version": "v2"
}
] | 2016-02-24 | [
[
"Krasiński",
"Andrzej",
""
]
] | It is shown that the basic observed properties of the gamma-ray bursts (GRBs) are accounted for if one assumes that the GRBs arise by blueshifting the emission radiation of hydrogen and helium generated during the last scattering epoch. The blueshift generator for a single GRB is a region with a nonconstant bang-time f... |
gr-qc/0611123 | Sayan Kar | Sayan Kar (IIT Kharagpur, India) and Soumitra SenGupta (IACS, Kolkata,
India) | The Raychaudhuri equations: a brief review | 35 pages, two figures, to appear in the special issue of Pramana
dedicated to the memory of A. K. Raychaudhuri | Pramana69:49,2007 | 10.1007/s12043-007-0110-9 | null | gr-qc | null | We present a brief review on the Raychaudhuri equations. Beginning with a
summary of the essential features of the original article by Raychaudhuri and
subsequent work of numerous authors, we move on to a discussion of the
equations in the context of alternate non--Riemannian spacetimes as well as
other theories of g... | [
{
"created": "Thu, 23 Nov 2006 10:55:07 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kar",
"Sayan",
"",
"IIT Kharagpur, India"
],
[
"SenGupta",
"Soumitra",
"",
"IACS, Kolkata,\n India"
]
] | We present a brief review on the Raychaudhuri equations. Beginning with a summary of the essential features of the original article by Raychaudhuri and subsequent work of numerous authors, we move on to a discussion of the equations in the context of alternate non--Riemannian spacetimes as well as other theories of gra... |
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