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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1206.0179 | Monica Forte | Luis P. Chimento, M\'onica I. Forte and Mart\'in G. Richarte | Holographic dark energy linearly interacting with dark matter | March 2012. 6 pp., 6 figures. Note: To appear in the proceedings of
the CosmoSul conference, held in Rio de Janeiro, Brazil, 01-05 august of 2011 | AIP Conf. Proc. 1471, 39 (2012) | 10.1063/1.4756809 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a spatially flat Friedmann-Robertson-Walker (FRW) cosmological
model with cold dark matter coupled to a modified holographic Ricci dark energy
through a general interaction term linear in the energy densities of dark
matter and dark energy, the total energy density and its derivative. Using the
statist... | [
{
"created": "Fri, 1 Jun 2012 13:39:58 GMT",
"version": "v1"
}
] | 2012-10-15 | [
[
"Chimento",
"Luis P.",
""
],
[
"Forte",
"Mónica I.",
""
],
[
"Richarte",
"Martín G.",
""
]
] | We investigate a spatially flat Friedmann-Robertson-Walker (FRW) cosmological model with cold dark matter coupled to a modified holographic Ricci dark energy through a general interaction term linear in the energy densities of dark matter and dark energy, the total energy density and its derivative. Using the statistic... |
1509.02495 | Mohammed M. Khalil | Ahmed Farag Ali, Mohammed M. Khalil | Black Hole with Quantum Potential | 16 pages, 6 figures; Accepted in Nucl.Phys.B | Nucl.Phys. B909 (2016) 173-185 | 10.1016/j.nuclphysb.2016.05.005 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we investigate black hole (BH) physics in the context of
quantum corrections. These quantum corrections were introduced recently by
replacing classical geodesics with quantal (Bohmian) trajectories and hence
form a quantum Raychaudhuri equation (QRE). From the QRE, we derive a modified
Schwarzschild met... | [
{
"created": "Sun, 6 Sep 2015 11:24:38 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Oct 2015 18:47:08 GMT",
"version": "v2"
},
{
"created": "Sun, 8 May 2016 08:35:57 GMT",
"version": "v3"
}
] | 2016-11-04 | [
[
"Ali",
"Ahmed Farag",
""
],
[
"Khalil",
"Mohammed M.",
""
]
] | In this work, we investigate black hole (BH) physics in the context of quantum corrections. These quantum corrections were introduced recently by replacing classical geodesics with quantal (Bohmian) trajectories and hence form a quantum Raychaudhuri equation (QRE). From the QRE, we derive a modified Schwarzschild metri... |
2004.02935 | Christos Tsagas | Ameya Chavda, John D. Barrow, Christos G. Tsagas | Kinematical and dynamical aspects of ghost-matter cosmologies | Minor revision. References added. To appear in CQG | null | 10.1088/1361-6382/abad82 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the kinematical and dynamical evolution of Friedmann universes
with a mixture of non-interacting matter and a ghost-like field, in a scenario
analogous to that advocated by the Quintom model. Assuming that the
conventional matter dominates today, we find that the ghost component can bring
the future expan... | [
{
"created": "Mon, 6 Apr 2020 18:53:13 GMT",
"version": "v1"
},
{
"created": "Mon, 4 May 2020 19:15:47 GMT",
"version": "v2"
},
{
"created": "Thu, 13 Aug 2020 13:34:52 GMT",
"version": "v3"
}
] | 2020-10-28 | [
[
"Chavda",
"Ameya",
""
],
[
"Barrow",
"John D.",
""
],
[
"Tsagas",
"Christos G.",
""
]
] | We consider the kinematical and dynamical evolution of Friedmann universes with a mixture of non-interacting matter and a ghost-like field, in a scenario analogous to that advocated by the Quintom model. Assuming that the conventional matter dominates today, we find that the ghost component can bring the future expansi... |
1908.11418 | Matteo Breschi | Matteo Breschi, Sebastiano Bernuzzi, Francesco Zappa, Michalis
Agathos, Albino Perego, David Radice, and Alessandro Nagar | kiloHertz gravitational waves from binary neutron star remnants:
time-domain model and constraints on extreme matter | null | Phys. Rev. D 100, 104029 (2019) | 10.1103/PhysRevD.100.104029 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The remnant star of a neutron star merger is an anticipated loud source of
kiloHertz gravitational waves that conveys unique information on the equation
of state of hot matter at extreme densities. Observations of such signals are
hampered by the photon shot noise of ground-based interferometers and pose a
challenge ... | [
{
"created": "Thu, 29 Aug 2019 18:41:11 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Jan 2020 15:41:47 GMT",
"version": "v2"
}
] | 2020-01-22 | [
[
"Breschi",
"Matteo",
""
],
[
"Bernuzzi",
"Sebastiano",
""
],
[
"Zappa",
"Francesco",
""
],
[
"Agathos",
"Michalis",
""
],
[
"Perego",
"Albino",
""
],
[
"Radice",
"David",
""
],
[
"Nagar",
"Alessandro",
""
... | The remnant star of a neutron star merger is an anticipated loud source of kiloHertz gravitational waves that conveys unique information on the equation of state of hot matter at extreme densities. Observations of such signals are hampered by the photon shot noise of ground-based interferometers and pose a challenge fo... |
2002.10951 | Seema Satin | Seema Satin | A Fluctuation Dissipation Relation for Relativistic stars | arXiv admin note: text overlap with arXiv:1711.06859..... some flaw
in the assumption for solution of the equations has been found, which is a
non-trivial mistake, hence needs to be worked upon again with correct
assumptions, and see if this work can progress with analytical closed form
results or needs numeric... | null | null | null | gr-qc astro-ph.HE astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A fluctuation-dissipation relation for perturbed configuration of a
relativistic star is obtained. The stochastic fluctuations of the classical
stress tensor comprising the matter content ( a perfect fluid) of the
relativistic star, act as the source in a classical Einstien-Langevin equation
describing the system. We... | [
{
"created": "Sat, 22 Feb 2020 11:33:15 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Apr 2020 15:20:36 GMT",
"version": "v2"
}
] | 2020-04-02 | [
[
"Satin",
"Seema",
""
]
] | A fluctuation-dissipation relation for perturbed configuration of a relativistic star is obtained. The stochastic fluctuations of the classical stress tensor comprising the matter content ( a perfect fluid) of the relativistic star, act as the source in a classical Einstien-Langevin equation describing the system. We d... |
1301.7595 | Vasiliy P. Neznamov | M.A. Vronsky, M.V. Gorbatenko, N.S. Kolesnikov, V.P. Neznamov, E.Yu.
Popov, I.I. Safronov | Stationary Bound States of Dirac Particles in the Schwarzschild
Gravitational Field | 24 pages, 12 figures, 2 tables | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Nondecaying bound states of elementary spin-half particles are validated and
calculated numerically for the Schwarzschild gravitational field using a
self-conjugate Hamiltonian with a flat scalar product for any value of the
gravitational coupling constant. Hilbert condition g_{00}>0 leads to a boundary
condition suc... | [
{
"created": "Thu, 31 Jan 2013 12:40:58 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Mar 2013 18:07:29 GMT",
"version": "v2"
},
{
"created": "Mon, 18 Mar 2013 08:41:44 GMT",
"version": "v3"
},
{
"created": "Wed, 10 Jul 2013 16:40:46 GMT",
"version": "v4"
}
] | 2013-07-11 | [
[
"Vronsky",
"M. A.",
""
],
[
"Gorbatenko",
"M. V.",
""
],
[
"Kolesnikov",
"N. S.",
""
],
[
"Neznamov",
"V. P.",
""
],
[
"Popov",
"E. Yu.",
""
],
[
"Safronov",
"I. I.",
""
]
] | Nondecaying bound states of elementary spin-half particles are validated and calculated numerically for the Schwarzschild gravitational field using a self-conjugate Hamiltonian with a flat scalar product for any value of the gravitational coupling constant. Hilbert condition g_{00}>0 leads to a boundary condition such ... |
0802.3422 | Alex Nielsen | Alex B. Nielsen | Black Holes without Event Horizons | Talk at APCTP Winter School, Daejeon, Korea, 2008. 7 pages, no
figures | J.Korean Phys.Soc.54:2576-2582,2009 | 10.3938/jkps.54.2576 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss some of the drawbacks of using event horizons to define black
holes. The reasons are both practical, physical and theoretical. We argue that
locally defined trapping horizons can remedy many of these drawbacks. We
examine of the question of whether black hole thermodynamics should be
associated with event ... | [
{
"created": "Sat, 23 Feb 2008 04:07:48 GMT",
"version": "v1"
}
] | 2010-11-02 | [
[
"Nielsen",
"Alex B.",
""
]
] | We discuss some of the drawbacks of using event horizons to define black holes. The reasons are both practical, physical and theoretical. We argue that locally defined trapping horizons can remedy many of these drawbacks. We examine of the question of whether black hole thermodynamics should be associated with event ho... |
2405.14274 | Yi-Ming Hu | Lu Wang, Hong-Yu Chen, Xiangyu Lyu, En-Kun Li, Yi-Ming Hu | Window and inpainting: dealing with data gaps for TianQin | 12 pages, 5 figures, comments welcome | null | null | null | gr-qc astro-ph.GA astro-ph.IM physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Space-borne gravitational wave detectors like TianQin might encounter data
gaps due to factors like micro-meteoroid collisions or hardware failures. Such
glitches will cause discontinuity in the data and have been observed in the
LISA Pathfinder. The existence of such data gaps presents challenges to the
data analysi... | [
{
"created": "Thu, 23 May 2024 07:51:18 GMT",
"version": "v1"
}
] | 2024-05-24 | [
[
"Wang",
"Lu",
""
],
[
"Chen",
"Hong-Yu",
""
],
[
"Lyu",
"Xiangyu",
""
],
[
"Li",
"En-Kun",
""
],
[
"Hu",
"Yi-Ming",
""
]
] | Space-borne gravitational wave detectors like TianQin might encounter data gaps due to factors like micro-meteoroid collisions or hardware failures. Such glitches will cause discontinuity in the data and have been observed in the LISA Pathfinder. The existence of such data gaps presents challenges to the data analysis ... |
gr-qc/9508034 | Gravity Research Group | A.Yu.Kamenshchik, I.M.Khalatnikov, A.V.Toporensky | Non-minimally coupled complex scalar field in classical and quantum
cosmology | 15 pages, LaTeX, to appear in Physics Letters B | Phys.Lett. B357 (1995) 36-42 | 10.1016/0370-2693(95)00834-8 | NSI 95/10 | gr-qc | null | We investigate the cosmological model with complex scalar self-interacting
inflaton field non-minimally coupled to gravity. The different geometries of
the Euclidean classically forbidden regions are represented. The instanton
solutions of the corresponding Euclidean equations of motion are found by
numerical calcula... | [
{
"created": "Tue, 15 Aug 1995 08:22:48 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Kamenshchik",
"A. Yu.",
""
],
[
"Khalatnikov",
"I. M.",
""
],
[
"Toporensky",
"A. V.",
""
]
] | We investigate the cosmological model with complex scalar self-interacting inflaton field non-minimally coupled to gravity. The different geometries of the Euclidean classically forbidden regions are represented. The instanton solutions of the corresponding Euclidean equations of motion are found by numerical calculati... |
gr-qc/0610160 | Marc-Thierry Jaekel | Serge Reynaud (LKB - Jussieu), Marc-Thierry Jaekel (LPTENS) | Long range gravity tests and the Pioneer anomaly | 8 pages | Int.J.Mod.Phys.D16:2091-2105,2007 | 10.1142/S0218271807011656 | null | gr-qc | null | Experimental tests of gravity performed in the solar system show a good
agreement with general relativity. The latter is however challenged by the
Pioneer anomaly which might be pointing at some modification of gravity law at
ranges of the order of the size of the solar system. As this question could be
related to th... | [
{
"created": "Tue, 31 Oct 2006 20:00:23 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Reynaud",
"Serge",
"",
"LKB - Jussieu"
],
[
"Jaekel",
"Marc-Thierry",
"",
"LPTENS"
]
] | Experimental tests of gravity performed in the solar system show a good agreement with general relativity. The latter is however challenged by the Pioneer anomaly which might be pointing at some modification of gravity law at ranges of the order of the size of the solar system. As this question could be related to the ... |
0704.2917 | Jeff Crowder | Jeff Crowder and Neil J. Cornish | Extracting galactic binary signals from the first round of Mock LISA
Data Challenges | 13 pages, 4 figures, submitted to Proceedings of GWDAW-11 (Berlin,
Dec. '06) | Class.Quant.Grav.24:S575-S586,2007 | 10.1088/0264-9381/24/19/S20 | null | gr-qc | null | We report on the performance of an end-to-end Bayesian analysis pipeline for
detecting and characterizing galactic binary signals in simulated LISA data.
Our principal analysis tool is the Blocked-Annealed Metropolis Hasting (BAM)
algorithm, which has been optimized to search for tens of thousands of
overlapping sign... | [
{
"created": "Mon, 23 Apr 2007 03:26:38 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Crowder",
"Jeff",
""
],
[
"Cornish",
"Neil J.",
""
]
] | We report on the performance of an end-to-end Bayesian analysis pipeline for detecting and characterizing galactic binary signals in simulated LISA data. Our principal analysis tool is the Blocked-Annealed Metropolis Hasting (BAM) algorithm, which has been optimized to search for tens of thousands of overlapping signal... |
2012.00696 | Maria-Jose Guzman | Alexey Golovnev, Maria-Jose Guzman | Non-trivial Minkowski backgrounds in f(T) gravity | 10 pages, no figures, comments welcome; additional discussion added | Phys. Rev. D 103, 044009 (2021) | 10.1103/PhysRevD.103.044009 | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | Boosted and rotated tetrad backgrounds for the Minkowski space are studied in
$f(T)$ gravity. We perform Lorentzian perturbations at first order around
non-trivial backgrounds and show that some Lorentz modes can exhibit
non-trivial dynamics and can propagate in time. This remarkable feature gives
evidence of additio... | [
{
"created": "Tue, 1 Dec 2020 17:56:42 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Dec 2020 15:25:02 GMT",
"version": "v2"
},
{
"created": "Sat, 16 Jan 2021 09:29:37 GMT",
"version": "v3"
}
] | 2021-02-04 | [
[
"Golovnev",
"Alexey",
""
],
[
"Guzman",
"Maria-Jose",
""
]
] | Boosted and rotated tetrad backgrounds for the Minkowski space are studied in $f(T)$ gravity. We perform Lorentzian perturbations at first order around non-trivial backgrounds and show that some Lorentz modes can exhibit non-trivial dynamics and can propagate in time. This remarkable feature gives evidence of additiona... |
1710.04015 | Klaus Liegener | Andrea Dapor and Klaus Liegener | Cosmological Coherent State Expectation Values in LQG I. Isotropic
Kinematics | 43 pages, 1 figure | Class. Quant. Grav. 35 (2018) no. 13, 135011 | 10.1088/1361-6382/aac4ba | null | gr-qc hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is the first paper of a series dedicated to LQG coherent states and
cosmology. The concept is based on the effective dynamics program of Loop
Quantum Cosmology, where the classical dynamics generated by the expectation
value of the Hamiltonian on semiclassical states is found to be in agreement
with the quantum ... | [
{
"created": "Wed, 11 Oct 2017 11:42:00 GMT",
"version": "v1"
}
] | 2019-11-14 | [
[
"Dapor",
"Andrea",
""
],
[
"Liegener",
"Klaus",
""
]
] | This is the first paper of a series dedicated to LQG coherent states and cosmology. The concept is based on the effective dynamics program of Loop Quantum Cosmology, where the classical dynamics generated by the expectation value of the Hamiltonian on semiclassical states is found to be in agreement with the quantum ev... |
gr-qc/0404041 | Roche Philippe | E.Buffenoir, M.Henneaux, K.Noui, Ph.Roche | Hamiltonian Analysis of Plebanski Theory | 25 pages, no figures, references added | Class.Quant.Grav.21:5203-5220,2004 | 10.1088/0264-9381/21/22/012 | null | gr-qc | null | We study the Hamiltonian formulation of Plebanski theory in both the
Euclidean and Lorentzian cases. A careful analysis of the constraints shows
that the system is non regular, i.e. the rank of the Dirac matrix is
non-constant on the non-reduced phase space. We identify the gravitational and
topological sectors which... | [
{
"created": "Fri, 9 Apr 2004 10:11:17 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Jun 2004 15:45:16 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Buffenoir",
"E.",
""
],
[
"Henneaux",
"M.",
""
],
[
"Noui",
"K.",
""
],
[
"Roche",
"Ph.",
""
]
] | We study the Hamiltonian formulation of Plebanski theory in both the Euclidean and Lorentzian cases. A careful analysis of the constraints shows that the system is non regular, i.e. the rank of the Dirac matrix is non-constant on the non-reduced phase space. We identify the gravitational and topological sectors which a... |
gr-qc/9712042 | G. Dautcourt | G. Dautcourt | Self-consistent solutions for low-frequency gravitational background
radiation | 3 pages, Latex (requires mprocl.sty). To appear in the Proceedings of
the Eighth Marcel Grossmann meeting (Jerusalem, June 22-27, 1977) | null | null | null | gr-qc | null | We study in a Brill-Hartle type of approximation the back-reaction of a
superposition of linear gravitational waves in an Einstein-de Sitter background
up to the second order in the small wave amplitudes $h_{ik}$. The wave
amplitudes are assumed to form a homogeneous and isotropic stochastic process.
No restriction f... | [
{
"created": "Tue, 9 Dec 1997 16:09:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dautcourt",
"G.",
""
]
] | We study in a Brill-Hartle type of approximation the back-reaction of a superposition of linear gravitational waves in an Einstein-de Sitter background up to the second order in the small wave amplitudes $h_{ik}$. The wave amplitudes are assumed to form a homogeneous and isotropic stochastic process. No restriction for... |
gr-qc/0108024 | Gerard Clement | Gerard Clement and Sean A. Hayward | Comment on `An extreme critical space-time: echoing and black-hole
perturbations' | 3 pages | Class.Quant.Grav. 18 (2001) 4715 | 10.1088/0264-9381/18/21/401 | null | gr-qc | null | We show that the black hole perturbations of the Hayward static solution to
the massless Einstein-Klein-Gordon equations are actually gauge artifacts
resulting from the linearization of a coordinate transformation.
| [
{
"created": "Wed, 8 Aug 2001 14:45:29 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Clement",
"Gerard",
""
],
[
"Hayward",
"Sean A.",
""
]
] | We show that the black hole perturbations of the Hayward static solution to the massless Einstein-Klein-Gordon equations are actually gauge artifacts resulting from the linearization of a coordinate transformation. |
1206.1869 | Maurizio Maria D'Eliseo | Maurizio M. D'Eliseo | The relativistic precession of the orbits | Accepted for publication in Astrophysics & Space Science | null | 10.1007/s10509-012-1142-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The relativistic precession can be quickly inferred from the nonlinear polar
orbit equation without actually solving it.
| [
{
"created": "Thu, 7 Jun 2012 17:32:34 GMT",
"version": "v1"
}
] | 2015-06-05 | [
[
"D'Eliseo",
"Maurizio M.",
""
]
] | The relativistic precession can be quickly inferred from the nonlinear polar orbit equation without actually solving it. |
gr-qc/0003065 | Laszlo A. Gergely | L\'aszl\'o \'A Gergely, Mitchell McKain | The geometry of the Barbour-Bertotti theories II. The three body problem | 16 pages, 2 eps figures, to appear in Classical and Quantum Gravity | Class.Quant.Grav. 17 (2000) 1963-1978 | 10.1088/0264-9381/17/9/307 | null | gr-qc | null | We present a geometric approach to the three-body problem in the
non-relativistic context of the Barbour-Bertotti theories. The Riemannian
metric characterizing the dynamics is analyzed in detail in terms of the
relative separations. Consequences of a conformal symmetry are exploited and
the sectional curvatures of g... | [
{
"created": "Thu, 16 Mar 2000 09:12:27 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Gergely",
"László Á",
""
],
[
"McKain",
"Mitchell",
""
]
] | We present a geometric approach to the three-body problem in the non-relativistic context of the Barbour-Bertotti theories. The Riemannian metric characterizing the dynamics is analyzed in detail in terms of the relative separations. Consequences of a conformal symmetry are exploited and the sectional curvatures of geo... |
1301.2430 | Gonzalo Olmo | Gonzalo J. Olmo and D. Rubiera-Garcia | Nonsingular Black Holes in Palatini Extensions of General Relativity | 3 pages, contribution to the Proceedings of the Thirteenth Marcel
Grossman Meeting on General Relativity, Astrophysics and Relativistic Field
Theories (to appear) | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss static, spherically symmetric solutions with an electric field in
a quadratic extension of general relativity formulated in the Palatini approach
(assuming that metric and connection are independent fields). Unlike the usual
metric formulation of this theory, the field equations are second-order and
ghost-... | [
{
"created": "Fri, 11 Jan 2013 09:34:56 GMT",
"version": "v1"
}
] | 2013-01-14 | [
[
"Olmo",
"Gonzalo J.",
""
],
[
"Rubiera-Garcia",
"D.",
""
]
] | We discuss static, spherically symmetric solutions with an electric field in a quadratic extension of general relativity formulated in the Palatini approach (assuming that metric and connection are independent fields). Unlike the usual metric formulation of this theory, the field equations are second-order and ghost-fr... |
2207.03296 | J\'er\'emie Francfort | J\'er\'emie Francfort | Observables In Cosmology: Three Astronomical Perspectives | PhD Thesis | null | null | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | In this thesis, I present three projects I carried out during m PhD. In the
first project, I introduce Conformal Transformations and the Galaxy Number
County. I explicitly show that the Galaxy Number Counts is invariant under
Conformal Transformations, which makes it a good physical observable. In the
second project,... | [
{
"created": "Thu, 7 Jul 2022 13:43:26 GMT",
"version": "v1"
}
] | 2022-07-08 | [
[
"Francfort",
"Jérémie",
""
]
] | In this thesis, I present three projects I carried out during m PhD. In the first project, I introduce Conformal Transformations and the Galaxy Number County. I explicitly show that the Galaxy Number Counts is invariant under Conformal Transformations, which makes it a good physical observable. In the second project, I... |
2107.04342 | David Brizuela | David Brizuela, Tomasz Pawlowski | Quantum fluctuations and semiclassicality in an inflaton-driven
evolution | Expanded version of the paper accepted for publication in JCAP. We
have included a more detailed derivation of the model, some clarifications on
the presentation of the results, and several new references | JCAP 10 (2022) 080 | 10.1088/1475-7516/2022/10/080 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A semiclassical description of quantum systems is applied to probe the
dynamics of the cosmological model of an inflationary universe with quadratic
inflaton potential, described in a quantum framework of geometrodynamics. The
systematic analysis, focusing in particular on the inflationary and
post-inflationary epoch... | [
{
"created": "Fri, 9 Jul 2021 10:20:54 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Oct 2022 09:56:51 GMT",
"version": "v2"
}
] | 2022-10-27 | [
[
"Brizuela",
"David",
""
],
[
"Pawlowski",
"Tomasz",
""
]
] | A semiclassical description of quantum systems is applied to probe the dynamics of the cosmological model of an inflationary universe with quadratic inflaton potential, described in a quantum framework of geometrodynamics. The systematic analysis, focusing in particular on the inflationary and post-inflationary epochs,... |
gr-qc/0009051 | Dmitri Vassilevich | W. Kummer, D.V. Vassilevich | Hawking radiation and Hawking flux from spherical reduction | Invited Talk at Parallel Session "Black Hole Thermodynamics" of 9th
Marcel Grossmann Conference Rome, 2-8 July 2000, 6 p | null | null | null | gr-qc | null | Using heat kernel techniques we show that the relation between Hawking
temperature and radiation flux known from Einstein gravity in D dimensions can
be reproduced from the spherically reduced action. A recent controversy
regarding the D=2 anomaly for that case is discussed. The generalized effective
Polyakov action ... | [
{
"created": "Thu, 14 Sep 2000 15:23:42 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kummer",
"W.",
""
],
[
"Vassilevich",
"D. V.",
""
]
] | Using heat kernel techniques we show that the relation between Hawking temperature and radiation flux known from Einstein gravity in D dimensions can be reproduced from the spherically reduced action. A recent controversy regarding the D=2 anomaly for that case is discussed. The generalized effective Polyakov action in... |
1711.06584 | Ritabrata Biswas | Amritendu Haldar and Ritabrata Biswas | Properties of Particle Trajectory Around a Weakly Magnetized Black Hole | 13 Figures | Commun. Theor. Phys. 70 (2018) 593 | 10.1088/0253-6102/70/5/593 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we consider charged accelerating AdS black holes with
nonlinear electromagnetic source. The metric chosen by us is of a regular black
hole which shows regular nature at poles and a conical effect which corresponds
to a cosmic string. In such a space time construction of the Lagrangian for a
charged par... | [
{
"created": "Wed, 15 Nov 2017 07:30:02 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Mar 2019 01:48:09 GMT",
"version": "v2"
}
] | 2019-03-18 | [
[
"Haldar",
"Amritendu",
""
],
[
"Biswas",
"Ritabrata",
""
]
] | In this paper, we consider charged accelerating AdS black holes with nonlinear electromagnetic source. The metric chosen by us is of a regular black hole which shows regular nature at poles and a conical effect which corresponds to a cosmic string. In such a space time construction of the Lagrangian for a charged parti... |
1006.0431 | Yi Pan | Yi Pan, Alessandra Buonanno, Ryuichi Fujita, Etienne Racine, and
Hideyuki Tagoshi | Post-Newtonian factorized multipolar waveforms for spinning,
non-precessing black-hole binaries | 37 pages, 11 figures; Typos in Sec.IV Eqs.(38-42) fixed | Phys.Rev.D83:064003,2011; Phys.Rev.D87:109901(E),2013 | 10.1103/PhysRevD.83.064003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We generalize the factorized resummation of multipolar waveforms introduced
by Damour, Iyer and Nagar to spinning black holes. For a nonspinning
test-particle spiraling a Kerr black hole in the equatorial plane, we find that
factorized multipolar amplitudes which replace the residual relativistic
amplitude f_{l m} wi... | [
{
"created": "Wed, 2 Jun 2010 16:01:38 GMT",
"version": "v1"
},
{
"created": "Thu, 9 May 2013 03:35:10 GMT",
"version": "v2"
}
] | 2013-05-10 | [
[
"Pan",
"Yi",
""
],
[
"Buonanno",
"Alessandra",
""
],
[
"Fujita",
"Ryuichi",
""
],
[
"Racine",
"Etienne",
""
],
[
"Tagoshi",
"Hideyuki",
""
]
] | We generalize the factorized resummation of multipolar waveforms introduced by Damour, Iyer and Nagar to spinning black holes. For a nonspinning test-particle spiraling a Kerr black hole in the equatorial plane, we find that factorized multipolar amplitudes which replace the residual relativistic amplitude f_{l m} with... |
gr-qc/0509020 | Panagiotis Labropoulos | Panagiotis G. Labropoulos, Panayiotis C. Stavrinos | A locally anisotropic geometrical model of space-time based on CMBR | 5 pages, 0 figures, 7th International Astronomy Conference of the
Hellenic Astronomical Society, curvature and connection sections decreased,
minor explanation added, fixed some typos | null | 10.1063/1.2348060 | null | gr-qc | null | We study a locally anisotropic model of General Relativity in the framework
of a more general geometrical structure than the Riemannian one. In this model
the observable anisotropy of the CMBR (WMAP) is represented by a tensor of
anisotropy and it is included in the metric structure of space-time. As well,
some inter... | [
{
"created": "Wed, 7 Sep 2005 13:43:58 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Dec 2005 22:48:26 GMT",
"version": "v2"
},
{
"created": "Fri, 17 Feb 2006 22:46:03 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Labropoulos",
"Panagiotis G.",
""
],
[
"Stavrinos",
"Panayiotis C.",
""
]
] | We study a locally anisotropic model of General Relativity in the framework of a more general geometrical structure than the Riemannian one. In this model the observable anisotropy of the CMBR (WMAP) is represented by a tensor of anisotropy and it is included in the metric structure of space-time. As well, some interes... |
2308.09781 | Gray Reid | Gray D. Reid, Matthew W. Choptuik | Stability of Non-Minimally Coupled Topological-Defect Boson Stars | 19 pages, 24 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As shown by Marunovic and Murkovic, non-minimal d-stars, composite structures
consisting of a boson star and a global monopole non-minimally coupled to the
general relativistic field, can have extremely high gravitational compactness.
In a previous paper we demonstrated that these ground-state stationary
solutions ar... | [
{
"created": "Fri, 18 Aug 2023 19:05:32 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Dec 2023 08:07:16 GMT",
"version": "v2"
},
{
"created": "Sat, 30 Dec 2023 03:15:04 GMT",
"version": "v3"
}
] | 2024-01-02 | [
[
"Reid",
"Gray D.",
""
],
[
"Choptuik",
"Matthew W.",
""
]
] | As shown by Marunovic and Murkovic, non-minimal d-stars, composite structures consisting of a boson star and a global monopole non-minimally coupled to the general relativistic field, can have extremely high gravitational compactness. In a previous paper we demonstrated that these ground-state stationary solutions are ... |
1001.0288 | Jian-Yang Zhu | Li-Fang Li and Jian-Yang Zhu | Dynamical Horizon Entropy Bound Conjecture in Loop Quantum Cosmology | 4 pages, 2 figures, revised version | Commun. Theor. Phys. 58, 63 (2012) | 10.1088/0253-6102/58/1/13 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The covariant entropy bound conjecture is an important hint for the quantum
gravity, with several versions available in the literature. For cosmology,
Ashtekar and Wilson-Ewing ever show the consistence between the loop gravity
theory and one version of this conjecture. Recently, S. He and H. Zhang
proposed a version... | [
{
"created": "Sat, 2 Jan 2010 08:49:18 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Jun 2010 14:53:13 GMT",
"version": "v2"
}
] | 2015-05-14 | [
[
"Li",
"Li-Fang",
""
],
[
"Zhu",
"Jian-Yang",
""
]
] | The covariant entropy bound conjecture is an important hint for the quantum gravity, with several versions available in the literature. For cosmology, Ashtekar and Wilson-Ewing ever show the consistence between the loop gravity theory and one version of this conjecture. Recently, S. He and H. Zhang proposed a version f... |
1910.11698 | Dr. Sudhaker Upadhyay | Behnam Pourhassan and Sudhaker Upadhyay | Perturbed thermodynamics of charged black hole solution in Rastall
theory | 23 pages, 35 captioned figures, to appear in EPJ Plus | Eur. Phys. J. Plus 136, 311 (2021) | 10.1140/epjp/s13360-021-01271-9 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the thermodynamics of a charged black hole surrounded by a perfect
fluid in Rastall theory and investigate three different cases of quintessence,
dust and radiation fields. By considering thermal fluctuations, we study the
corrected thermodynamics of the system. We investigate the effects of thermal
fluctuat... | [
{
"created": "Wed, 23 Oct 2019 17:19:02 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Feb 2021 15:04:15 GMT",
"version": "v2"
}
] | 2021-03-15 | [
[
"Pourhassan",
"Behnam",
""
],
[
"Upadhyay",
"Sudhaker",
""
]
] | We study the thermodynamics of a charged black hole surrounded by a perfect fluid in Rastall theory and investigate three different cases of quintessence, dust and radiation fields. By considering thermal fluctuations, we study the corrected thermodynamics of the system. We investigate the effects of thermal fluctuatio... |
gr-qc/0607121 | Catherine Meusburger | C. Meusburger | Geometrical (2+1)-gravity and the Chern-Simons formulation: Grafting,
Dehn twists, Wilson loop observables and the cosmological constant | 50 pages, 6 eps figures | Commun.Math.Phys.273:705-754,2007 | 10.1007/s00220-007-0255-x | null | gr-qc math-ph math.MP | null | We relate the geometrical and the Chern-Simons description of
(2+1)-dimensional gravity for spacetimes of topology $R\times S_g$, where $S_g$
is an oriented two-surface of genus $g>1$, for Lorentzian signature and general
cosmological constant and the Euclidean case with negative cosmological
constant. We show how th... | [
{
"created": "Wed, 26 Jul 2006 17:47:41 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Meusburger",
"C.",
""
]
] | We relate the geometrical and the Chern-Simons description of (2+1)-dimensional gravity for spacetimes of topology $R\times S_g$, where $S_g$ is an oriented two-surface of genus $g>1$, for Lorentzian signature and general cosmological constant and the Euclidean case with negative cosmological constant. We show how the ... |
1512.09003 | Sunil Maharaj | Sifiso A. Ngubelanga, Sunil D. Maharaj | Relativistic stars with polytropic equation of state | 10 pages, submitted for publication | Eur. Phys. J. Plus 130, 211 (2015) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the Einstein-Maxwell system of equations in the context of
isotropic coordinates for matter distributions with anisotropy in the presence
of an electric field. We assume a polytropic equation of state for the matter
configuration. New classes of exact solutions are generated for different
polytropic indic... | [
{
"created": "Wed, 30 Dec 2015 16:37:25 GMT",
"version": "v1"
}
] | 2015-12-31 | [
[
"Ngubelanga",
"Sifiso A.",
""
],
[
"Maharaj",
"Sunil D.",
""
]
] | We consider the Einstein-Maxwell system of equations in the context of isotropic coordinates for matter distributions with anisotropy in the presence of an electric field. We assume a polytropic equation of state for the matter configuration. New classes of exact solutions are generated for different polytropic indices... |
gr-qc/9904044 | B. Linet | B. Linet | Electrostatics in a Schwarzschild black hole pierced by a cosmic string | Latex, 8 pages, 1 figure in latex | Class.Quant.Grav. 16 (1999) 2947-2953 | 10.1088/0264-9381/16/9/312 | null | gr-qc | null | We explicitly determine the expression of the electrostatic potential
generated by a point charge at rest in the Schwarzschild black hole pierced by
a cosmic string. We can then calculate the electrostatic self-energy. From
this, we find again the upper entropy bound for a charged object by employing
thermodynamics o... | [
{
"created": "Mon, 19 Apr 1999 08:55:32 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Linet",
"B.",
""
]
] | We explicitly determine the expression of the electrostatic potential generated by a point charge at rest in the Schwarzschild black hole pierced by a cosmic string. We can then calculate the electrostatic self-energy. From this, we find again the upper entropy bound for a charged object by employing thermodynamics of ... |
gr-qc/0311063 | Anatoli Vankov A. | Anatoli Vankov | On Problem of Mass Origin and Self-Energy Divergence in Relativistic
Mechanics and Gravitational Physics | null | null | null | null | gr-qc | null | The classical problem of self-energy divergence was studied in the framework
of Lagrangian formulation of Relativistic Mechanics. The conclusion was made
that a revision of mass-energy concept is needed for the development of
singularity-free gravitational and electromagnetic field theory. Perspectives
of the develop... | [
{
"created": "Thu, 20 Nov 2003 00:33:31 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Vankov",
"Anatoli",
""
]
] | The classical problem of self-energy divergence was studied in the framework of Lagrangian formulation of Relativistic Mechanics. The conclusion was made that a revision of mass-energy concept is needed for the development of singularity-free gravitational and electromagnetic field theory. Perspectives of the developme... |
0808.2335 | Hamid Reza Sepangi | Malihe Heydari-Fard and Hamid R. Sepangi | Can local bulk effects explain the galactic dark matter? | 11 pages, no figures | JCAP 0808:018,2008 | 10.1088/1475-7516/2008/08/018 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain the virial theorem within the context of a brane-world model
without mirror symmetry or any form of junction condition. Taking a constant
curvature bulk (neglecting non-local bulk effects), the local bulk effects
generate a geometrical mass, contributing to the gravitational energy which may
be used to expl... | [
{
"created": "Mon, 18 Aug 2008 04:16:31 GMT",
"version": "v1"
}
] | 2010-10-27 | [
[
"Heydari-Fard",
"Malihe",
""
],
[
"Sepangi",
"Hamid R.",
""
]
] | We obtain the virial theorem within the context of a brane-world model without mirror symmetry or any form of junction condition. Taking a constant curvature bulk (neglecting non-local bulk effects), the local bulk effects generate a geometrical mass, contributing to the gravitational energy which may be used to explai... |
2009.01254 | Christopher Munna | Christopher Munna, Charles R. Evans | Eccentric-orbit extreme-mass-ratio-inspiral radiation II: 1PN correction
to leading-logarithm and subleading-logarithm flux sequences and the entire
perturbative 4PN flux | 36 pages, 1 figure | Phys. Rev. D 102, 104006 (2020) | 10.1103/PhysRevD.102.104006 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent paper we showed that for eccentric-orbit extreme-mass-ratio
inspirals the analytic forms of the leading-logarithm energy and angular
momentum post-Newtonian (PN) flux terms (radiated to infinity) can, to
arbitrary PN order, be determined by sums over the Fourier spectrum of the
Newtonian quadrupole moment... | [
{
"created": "Wed, 2 Sep 2020 18:00:07 GMT",
"version": "v1"
}
] | 2020-11-11 | [
[
"Munna",
"Christopher",
""
],
[
"Evans",
"Charles R.",
""
]
] | In a recent paper we showed that for eccentric-orbit extreme-mass-ratio inspirals the analytic forms of the leading-logarithm energy and angular momentum post-Newtonian (PN) flux terms (radiated to infinity) can, to arbitrary PN order, be determined by sums over the Fourier spectrum of the Newtonian quadrupole moment. ... |
2307.00977 | Haidar Sheikhahmadi | Hassan Firouzjahi, Haidar Sheikhahmadi | Vacuum Zero Point Energy and its Statistical Correlations in dS
Background | 23 pages | Phys. Rev. D 108, 065002, 2023 | 10.1103/PhysRevD.108.065002 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | We study the vacuum zero point energy associated to a scalar field with an
arbitrary mass and conformal coupling in a dS background. Employing dimensional
regularization scheme, we calculate the regularized zero point energy density,
pressure and the trace of the energy momentum tensor. It is shown that the
classical... | [
{
"created": "Mon, 3 Jul 2023 12:46:26 GMT",
"version": "v1"
}
] | 2023-09-25 | [
[
"Firouzjahi",
"Hassan",
""
],
[
"Sheikhahmadi",
"Haidar",
""
]
] | We study the vacuum zero point energy associated to a scalar field with an arbitrary mass and conformal coupling in a dS background. Employing dimensional regularization scheme, we calculate the regularized zero point energy density, pressure and the trace of the energy momentum tensor. It is shown that the classical r... |
gr-qc/0403005 | Sang Pyo Kim | Sang Pyo Kim (Kunsan Nat'l Univ.), Don N. Page (Univ. Alberta) | Magnetic Black Holes Are Also Unstable | RevTex4; Invited talk by Don N. Page at VI APCTP International
Conference of Gravitation and Astrophysics (ICGA6); Seoul, Oct. 6-9, 2003 | J.Korean Phys.Soc. 45 (2004) S59-S67 | null | null | gr-qc hep-th | null | Most black holes are known to be unstable to emitting Hawking radiation (in
asymptotically flat spacetime). If the black holes are non-extreme, they have
positive temperature and emit thermally. If they are extremal rotating black
holes, they still spontaneously emit particles like gravitons and photons. If
they are ... | [
{
"created": "Sun, 29 Feb 2004 09:10:03 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kim",
"Sang Pyo",
"",
"Kunsan Nat'l Univ."
],
[
"Page",
"Don N.",
"",
"Univ. Alberta"
]
] | Most black holes are known to be unstable to emitting Hawking radiation (in asymptotically flat spacetime). If the black holes are non-extreme, they have positive temperature and emit thermally. If they are extremal rotating black holes, they still spontaneously emit particles like gravitons and photons. If they are ex... |
1905.02318 | Jin Pu | Jin Pu, Sen Guo, Qing-Quan Jiang, Xiao-Tao Zu | Joule-Thomson expansion for the regular(Bardeen)-AdS black hole | 17 pages, 6 figures; Added discussion in section 4 | null | 10.1088/1674-1137/44/3/035102 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we attempt to study the Joule-Thomson expansion for the
regular black hole in an anti-de Sitter background, and obtain the inversion
temperature and curve for the Bardeen-AdS black hole in the extended phase
space. We investigate the isenthalpic and inversion curves for the Bardeen-AdS
black hole in th... | [
{
"created": "Sat, 4 May 2019 08:25:10 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jul 2019 14:32:51 GMT",
"version": "v2"
}
] | 2020-05-08 | [
[
"Pu",
"Jin",
""
],
[
"Guo",
"Sen",
""
],
[
"Jiang",
"Qing-Quan",
""
],
[
"Zu",
"Xiao-Tao",
""
]
] | In this paper, we attempt to study the Joule-Thomson expansion for the regular black hole in an anti-de Sitter background, and obtain the inversion temperature and curve for the Bardeen-AdS black hole in the extended phase space. We investigate the isenthalpic and inversion curves for the Bardeen-AdS black hole in the ... |
2201.05209 | Camilo Posada PhD | Camilo Posada, Jan Hlad\'ik and Zden\v{e}k Stuchl\'ik | New interior model of neutron stars | 10 pages, 10 figures. Matches version accepted for publication in
Phys. Rev. D | Phys. Rev. D 105, 104020 (2022) | 10.1103/PhysRevD.105.104020 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Tolman VII solution is considered by some as one of the few analytical
solutions to Einstein's equations, which describes approximately well the
interior of neutron stars (NSs). This solution is characterized by the mass
$M$, radius $R$, and an energy density that varies quadratically with the
radial coordinate $... | [
{
"created": "Thu, 13 Jan 2022 20:57:37 GMT",
"version": "v1"
},
{
"created": "Wed, 4 May 2022 09:21:40 GMT",
"version": "v2"
}
] | 2022-05-16 | [
[
"Posada",
"Camilo",
""
],
[
"Hladík",
"Jan",
""
],
[
"Stuchlík",
"Zdeněk",
""
]
] | The Tolman VII solution is considered by some as one of the few analytical solutions to Einstein's equations, which describes approximately well the interior of neutron stars (NSs). This solution is characterized by the mass $M$, radius $R$, and an energy density that varies quadratically with the radial coordinate $r$... |
0904.1359 | Leonardo Fernandez-Jambrina | L. Fern\'andez-Jambrina, L.M. Gonz\'alez-Romero | Non-singular Stiff Fluids | 4 pp, ws-procs | Proceedings of the Tenth Marcel Grossmann Meeting on General
Relativity. Ed: M. Novello, S. Perez Bergliaffa. World Scientific, Singapore,
1764-6 (2006) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk the possibility of constructing geodesically complete
inhomogeneous stiff fluid cosmologies is discussed. A family with infinite
parameters is derived. A wide and easy to implement sufficient condition for
geodesic completeness is shown.
| [
{
"created": "Wed, 8 Apr 2009 15:07:26 GMT",
"version": "v1"
}
] | 2009-04-09 | [
[
"Fernández-Jambrina",
"L.",
""
],
[
"González-Romero",
"L. M.",
""
]
] | In this talk the possibility of constructing geodesically complete inhomogeneous stiff fluid cosmologies is discussed. A family with infinite parameters is derived. A wide and easy to implement sufficient condition for geodesic completeness is shown. |
2402.04135 | Claus Lammerzahl | Claus Lammerzahl (Univ. Bremen) and Sebastian Ulbricht (PTB
Braunschweig) | A gravitational metrological triangle | 8 pages, 5 Figures | null | null | null | gr-qc quant-ph | http://creativecommons.org/licenses/by/4.0/ | Motivated by the similarity of the mathematical structure of Einstein's
General Relativity in its weak field limit and of Maxwell's theory of
electrodynamics it is shown that there are gravitational analogues of the
Josephson effect and the quantum Hall effect. These effects can be combined to
derive a gravitational ... | [
{
"created": "Tue, 6 Feb 2024 16:40:31 GMT",
"version": "v1"
}
] | 2024-02-07 | [
[
"Lammerzahl",
"Claus",
"",
"Univ. Bremen"
],
[
"Ulbricht",
"Sebastian",
"",
"PTB\n Braunschweig"
]
] | Motivated by the similarity of the mathematical structure of Einstein's General Relativity in its weak field limit and of Maxwell's theory of electrodynamics it is shown that there are gravitational analogues of the Josephson effect and the quantum Hall effect. These effects can be combined to derive a gravitational an... |
gr-qc/9802033 | Shinsuke Kawai | Shinsuke Kawai, Masa-aki Sakagami and Jiro Soda | Instability of 1-loop superstring cosmology | 10 pages, 6 figures, revtex | Phys.Lett. B437 (1998) 284-290 | 10.1016/S0370-2693(98)00925-3 | KUCP0114 | gr-qc hep-th | null | A stability analysis is made in the context of the previously discovered
non-singular cosmological solution from 1-loop corrected superstring effective
action. We found that this solution has an instability in graviton mode, which
is shown to have a close relation to the avoidance of initial singularity via
energy co... | [
{
"created": "Mon, 16 Feb 1998 04:49:41 GMT",
"version": "v1"
},
{
"created": "Mon, 11 May 1998 11:17:29 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Kawai",
"Shinsuke",
""
],
[
"Sakagami",
"Masa-aki",
""
],
[
"Soda",
"Jiro",
""
]
] | A stability analysis is made in the context of the previously discovered non-singular cosmological solution from 1-loop corrected superstring effective action. We found that this solution has an instability in graviton mode, which is shown to have a close relation to the avoidance of initial singularity via energy cond... |
2309.03144 | Aleksandra Go\v{c}anin | Ivana Stojiljkovi\'c, Du\v{s}an {\DJ}or{\dj}evi\'c, Aleksandra
Go\v{c}anin, and Dragoljub Go\v{c}anin | Testing the Braneworld Theory with Identical Particles | 6 pages, 6 figures, comments are welcome | Phys. Rev. D 108, 124008 (2023) | 10.1103/PhysRevD.108.124008 | null | gr-qc quant-ph | http://creativecommons.org/licenses/by/4.0/ | Various attempts to go beyond the theory of General Relativity start from the
assumption that spacetime is not a 4-dimensional but rather a
higher-dimensional manifold. Among others, braneworld scenarios postulate that
the spacetime we effectively observe is actually a 4-dimensional brane embedded
in a higher-dimensi... | [
{
"created": "Wed, 6 Sep 2023 16:40:12 GMT",
"version": "v1"
}
] | 2024-01-31 | [
[
"Stojiljković",
"Ivana",
""
],
[
"Đorđević",
"Dušan",
""
],
[
"Gočanin",
"Aleksandra",
""
],
[
"Gočanin",
"Dragoljub",
""
]
] | Various attempts to go beyond the theory of General Relativity start from the assumption that spacetime is not a 4-dimensional but rather a higher-dimensional manifold. Among others, braneworld scenarios postulate that the spacetime we effectively observe is actually a 4-dimensional brane embedded in a higher-dimension... |
2208.10177 | Ningchen Bai | Ning-Chen Bai, Lei Li and Jun Tao | Topology of black hole thermodynamics in Lovelock gravity | 11 pages, 7 figures | null | 10.1103/PhysRevD.107.064015 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we present a convenient method to perform the topological
analysis of black hole thermodynamics. Utilizing the spinodal curve,
thermodynamic critical points of a black hole are endowed with a topological
quantity, Brouwer degree, which reflects intrinsic properties of the system
under smooth deformation... | [
{
"created": "Mon, 22 Aug 2022 09:42:47 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Aug 2022 09:55:32 GMT",
"version": "v2"
}
] | 2023-03-29 | [
[
"Bai",
"Ning-Chen",
""
],
[
"Li",
"Lei",
""
],
[
"Tao",
"Jun",
""
]
] | In this work, we present a convenient method to perform the topological analysis of black hole thermodynamics. Utilizing the spinodal curve, thermodynamic critical points of a black hole are endowed with a topological quantity, Brouwer degree, which reflects intrinsic properties of the system under smooth deformations.... |
1104.3985 | Benny Rievers | Benny Rievers and Claus L\"ammerzahl | High precision thermal modeling of complex systems with application to
the flyby and Pioneer anomaly | Accepted for publication in Ann. Phys | null | 10.1002/andp.201100081 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Thermal modeling of complex systems faces the problems of an effective
digitalization of the detailed geometry and properties of the system,
calculation of the thermal flows and temperature maps, treatment of the thermal
radiation including possible multiple reflections, inclusion of additional
external influences, e... | [
{
"created": "Wed, 20 Apr 2011 10:34:44 GMT",
"version": "v1"
},
{
"created": "Thu, 5 May 2011 10:10:32 GMT",
"version": "v2"
}
] | 2015-05-27 | [
[
"Rievers",
"Benny",
""
],
[
"Lämmerzahl",
"Claus",
""
]
] | Thermal modeling of complex systems faces the problems of an effective digitalization of the detailed geometry and properties of the system, calculation of the thermal flows and temperature maps, treatment of the thermal radiation including possible multiple reflections, inclusion of additional external influences, ext... |
2006.03376 | Davide Batic | M. Alrais Alawadi, D. Batic, M. Nowakowski | Light bending in a two black hole metric | 27 pages, 3 figures, updated bibliography | null | 10.1088/1361-6382/abce6c | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the propagation of light in the C-metric. We discover that null
geodesics admit circular orbits only for a certain family of orbital cones.
Explicit analytic formulae are derived for the orbital radius and the
corresponding opening angle fixing the cone. Furthermore, we prove that these
orbits based on a s... | [
{
"created": "Fri, 5 Jun 2020 11:22:43 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Dec 2020 12:11:14 GMT",
"version": "v2"
},
{
"created": "Sun, 19 Nov 2023 10:17:21 GMT",
"version": "v3"
}
] | 2023-11-21 | [
[
"Alawadi",
"M. Alrais",
""
],
[
"Batic",
"D.",
""
],
[
"Nowakowski",
"M.",
""
]
] | We discuss the propagation of light in the C-metric. We discover that null geodesics admit circular orbits only for a certain family of orbital cones. Explicit analytic formulae are derived for the orbital radius and the corresponding opening angle fixing the cone. Furthermore, we prove that these orbits based on a sad... |
2205.11476 | Ali Ayatollah Rafsanjani | Behzad Ataei, Ali Ayatollah Rafsanjani, Alireza Bahrampour, Mohammad
Taeibi Rahni, Mohammadreza Salimi and Mehdi Golshani | An analogical model for the stationary black holes by the flow field of
space-time fluid around a 3-dimensional point sink | Keywords: general relativity; space-time fluid; analogue gravity;
acoustic metric; black hole; emergent gravity; Kerr metric; compressible flow | null | null | null | gr-qc hep-th physics.flu-dyn | http://creativecommons.org/licenses/by/4.0/ | Recent researches suggest an analogy between the theory of general relativity
(GR) and fluid dynamics. As a result of this analogy, the Navier-Stokes
equations and Einstein field equations are the same, and it is possible to
study the properties of space-time by using fluid mechanics. In this paper, we
present a new ... | [
{
"created": "Mon, 23 May 2022 17:25:00 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Nov 2022 11:15:05 GMT",
"version": "v2"
}
] | 2022-11-11 | [
[
"Ataei",
"Behzad",
""
],
[
"Rafsanjani",
"Ali Ayatollah",
""
],
[
"Bahrampour",
"Alireza",
""
],
[
"Rahni",
"Mohammad Taeibi",
""
],
[
"Salimi",
"Mohammadreza",
""
],
[
"Golshani",
"Mehdi",
""
]
] | Recent researches suggest an analogy between the theory of general relativity (GR) and fluid dynamics. As a result of this analogy, the Navier-Stokes equations and Einstein field equations are the same, and it is possible to study the properties of space-time by using fluid mechanics. In this paper, we present a new mo... |
gr-qc/0408065 | Morad Amarzguioui | Morad Amarzguioui and Oyvind Gron | Entropy of gravitationally collapsing matter in FRW universe models | 9 pages, 4 figures. Major changes from previous version. We consider
only thermodynamic entropy in this version. Published in PRD | Phys. Rev. D71, 083011 (2005) | 10.1103/PhysRevD.71.083011 | null | gr-qc astro-ph | null | We look at a gas of dust and investigate how its entropy evolves with time
under a spherically symmetric gravitational collapse. We treat the problem
perturbatively and find that the classical thermodynamic entropy does actually
increase to first order when one allows for gravitational potential energy to
be transfer... | [
{
"created": "Thu, 19 Aug 2004 10:34:33 GMT",
"version": "v1"
},
{
"created": "Fri, 20 May 2005 14:05:09 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Amarzguioui",
"Morad",
""
],
[
"Gron",
"Oyvind",
""
]
] | We look at a gas of dust and investigate how its entropy evolves with time under a spherically symmetric gravitational collapse. We treat the problem perturbatively and find that the classical thermodynamic entropy does actually increase to first order when one allows for gravitational potential energy to be transferre... |
1507.08453 | Cosimo Bambi | Cosimo Bambi, M. Ghasemi-Nodehi, D. Rubiera-Garcia | Modified gravity in three dimensional metric-affine scenarios | 9 pages, 4 figures, some differences with respect to the version
accepted for publication | Phys. Rev. D 92, 044016 (2015) | 10.1103/PhysRevD.92.044016 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider metric-affine scenarios where a modified gravitational action is
sourced by electrovacuum fields in a three dimensional space-time. Such
scenarios are supported by the physics of crystalline structures with
microscopic defects and, in particular, those that can be effectively treated
as bi-dimensional (li... | [
{
"created": "Thu, 30 Jul 2015 11:08:19 GMT",
"version": "v1"
}
] | 2015-08-13 | [
[
"Bambi",
"Cosimo",
""
],
[
"Ghasemi-Nodehi",
"M.",
""
],
[
"Rubiera-Garcia",
"D.",
""
]
] | We consider metric-affine scenarios where a modified gravitational action is sourced by electrovacuum fields in a three dimensional space-time. Such scenarios are supported by the physics of crystalline structures with microscopic defects and, in particular, those that can be effectively treated as bi-dimensional (like... |
0806.0339 | Giovanni Amelino-Camelia | Giovanni Amelino-Camelia | Quantum Spacetime Phenomenology | 125 pages, LaTex. This V2 is updated and more detailed than the V1,
particularly for quantum-spacetime phenomenology. The main text of this V2 is
about 25% more than the main text of the V1. Reference list roughly doubled | Living Rev.Rel. 16 (2013) 5 | 10.12942/lrr-2013-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I review the current status of phenomenological programs inspired by
quantum-spacetime research. I stress in particular the significance of results
establishing that certain data analyses provide sensitivity to effects
introduced genuinely at the Planck scale. And my main focus is on
phenomenological programs that ma... | [
{
"created": "Mon, 2 Jun 2008 17:21:44 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Jun 2013 07:08:36 GMT",
"version": "v2"
}
] | 2015-11-18 | [
[
"Amelino-Camelia",
"Giovanni",
""
]
] | I review the current status of phenomenological programs inspired by quantum-spacetime research. I stress in particular the significance of results establishing that certain data analyses provide sensitivity to effects introduced genuinely at the Planck scale. And my main focus is on phenomenological programs that mana... |
1410.2548 | Christian Schell | Christian Schell and Oliver Rinne | Spectral approach to axisymmetric evolution of Einstein's equations | 6 pages, based on a talk given by one of the authors at the Spanish
Relativity Meeting ERE14 in Valencia, published version | 2015 J. Phys.: Conf. Ser. 600 012060 | 10.1088/1742-6596/600/1/012060 | AEI-2014-055 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new formulation of Einstein's equations for an axisymmetric
spacetime with vanishing twist in vacuum. We propose a fully constrained scheme
and use spherical polar coordinates. A general problem for this choice is the
occurrence of coordinate singularities on the axis of symmetry and at the
origin. Spher... | [
{
"created": "Thu, 9 Oct 2014 17:57:33 GMT",
"version": "v1"
},
{
"created": "Thu, 14 May 2015 11:04:44 GMT",
"version": "v2"
}
] | 2015-05-15 | [
[
"Schell",
"Christian",
""
],
[
"Rinne",
"Oliver",
""
]
] | We present a new formulation of Einstein's equations for an axisymmetric spacetime with vanishing twist in vacuum. We propose a fully constrained scheme and use spherical polar coordinates. A general problem for this choice is the occurrence of coordinate singularities on the axis of symmetry and at the origin. Spheric... |
0803.2288 | Samad Khakshournia | Samad Khakshournia | A Note on the Generalized Friedmann Equations for a Thick Brane | 6 pages,To appear in GRG | Gen.Rel.Grav.40:1791-1796,2008 | 10.1007/s10714-007-0578-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within our thick brane approach previously used to obtain the cosmological
evolution equations on a thick brane embedded in a five-dimensional
Schwarzschild Anti-de Sitter spacetime it is explicitly shown that the
consistency of these equations with the energy conservation equation requires
that, in general, the thic... | [
{
"created": "Sat, 15 Mar 2008 11:49:56 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Khakshournia",
"Samad",
""
]
] | Within our thick brane approach previously used to obtain the cosmological evolution equations on a thick brane embedded in a five-dimensional Schwarzschild Anti-de Sitter spacetime it is explicitly shown that the consistency of these equations with the energy conservation equation requires that, in general, the thickn... |
2012.15111 | Maurice Dupre | Maurice J. Dupr\'e | The Jacobi Curvature Operator in Semi Riemannian Geometry and the Energy
Momentum Stress Tensor of the Gravitational Field | 110 pages. arXiv admin note: substantial text overlap with
arXiv:0903.5225, arXiv:1403.2618, arXiv:0803.1684 | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give a justification for generalizing the notion of the energy momentum
stress tensor in general relativity which results in the Jacobi curvature
tensor being the embodiment of total energy momentum stress including gravity
in general relativity.
| [
{
"created": "Wed, 30 Dec 2020 11:01:42 GMT",
"version": "v1"
}
] | 2021-01-01 | [
[
"Dupré",
"Maurice J.",
""
]
] | We give a justification for generalizing the notion of the energy momentum stress tensor in general relativity which results in the Jacobi curvature tensor being the embodiment of total energy momentum stress including gravity in general relativity. |
gr-qc/9801067 | William Krivan | Manuela Campanelli, William Krivan, and Carlos O. Lousto | The imposition of Cauchy data to the Teukolsky equation II: Numerical
comparison with the Zerilli-Moncrief approach to black hole perturbations | 14 pages, 7 Postscript figures, to appear in Phys. Rev. D | Phys. Rev. D 58, 024016 (1998) | 10.1103/PhysRevD.58.024016 | null | gr-qc astro-ph hep-th | null | We revisit the question of the imposition of initial data representing
astrophysical gravitational perturbations of black holes. We study their
dynamics for the case of nonrotating black holes by numerically evolving the
Teukolsky equation in the time domain. In order to express the Teukolsky
function Psi explicitly ... | [
{
"created": "Tue, 20 Jan 1998 17:58:46 GMT",
"version": "v1"
},
{
"created": "Fri, 8 May 1998 16:54:15 GMT",
"version": "v2"
}
] | 2016-08-25 | [
[
"Campanelli",
"Manuela",
""
],
[
"Krivan",
"William",
""
],
[
"Lousto",
"Carlos O.",
""
]
] | We revisit the question of the imposition of initial data representing astrophysical gravitational perturbations of black holes. We study their dynamics for the case of nonrotating black holes by numerically evolving the Teukolsky equation in the time domain. In order to express the Teukolsky function Psi explicitly in... |
2408.02647 | Eug\^enio Bastos Maciel | Eug\^enio Bastos Maciel, M.A. Anacleto, E. Passos | Gravitational Dipole Moment in Braneworld Model | 11 pages, one table | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the gravitational effects on the relativistic Dirac theory of
a system such as a Hydrogen atom in the braneworld scenario. A gravitational
dipole moment like contribution, arises in the nonrelativistic Hamiltonian of
the system through an exact Foldy-Wouthuysen transformation. This term violates
the eq... | [
{
"created": "Mon, 5 Aug 2024 17:24:44 GMT",
"version": "v1"
}
] | 2024-08-06 | [
[
"Maciel",
"Eugênio Bastos",
""
],
[
"Anacleto",
"M. A.",
""
],
[
"Passos",
"E.",
""
]
] | We investigate the gravitational effects on the relativistic Dirac theory of a system such as a Hydrogen atom in the braneworld scenario. A gravitational dipole moment like contribution, arises in the nonrelativistic Hamiltonian of the system through an exact Foldy-Wouthuysen transformation. This term violates the equi... |
gr-qc/9501033 | Bernd Stoetzel | Bernd Stoetzel | Two-dimensional gravitation and Sine-Gordon-Solitons | 23 pages, latex, references added, to appear in Phys.Rev.D | Phys.Rev. D52 (1995) 2192-2201 | 10.1103/PhysRevD.52.2192 | null | gr-qc | null | Some aspects of two-dimensional gravity coupled to matter fields, especially
to the Sine-Gordon-model are examined. General properties and boundary
conditions of possible soliton-solutions are considered. Analytic
soliton-solutions are discovered and the structure of the induced space-time
geometry is discussed. Thes... | [
{
"created": "Wed, 25 Jan 1995 21:36:24 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jan 1995 18:34:25 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Jul 1995 15:40:25 GMT",
"version": "v3"
}
] | 2009-10-28 | [
[
"Stoetzel",
"Bernd",
""
]
] | Some aspects of two-dimensional gravity coupled to matter fields, especially to the Sine-Gordon-model are examined. General properties and boundary conditions of possible soliton-solutions are considered. Analytic soliton-solutions are discovered and the structure of the induced space-time geometry is discussed. These ... |
gr-qc/9803003 | Yoonbai Kim | Yoonbai Kim and Sei-Hoon Moon | Gravitating $\sigma$ Model Solitons | 35 pages, RevTeX | Phys.Rev.D58:105013,1998 | 10.1103/PhysRevD.58.105013 | SNUTP-97-112 | gr-qc | null | We study axially symmetric static solitons of O(3) nonlinear $\sigma$ model
coupled to (2+1)-dimensional anti-de Sitter gravity. The obtained solutions are
not self-dual under static metric. The usual regular topological lump solution
cannot form a black hole even though the scale of symmetry breaking is
increased. T... | [
{
"created": "Sun, 1 Mar 1998 08:11:05 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Kim",
"Yoonbai",
""
],
[
"Moon",
"Sei-Hoon",
""
]
] | We study axially symmetric static solitons of O(3) nonlinear $\sigma$ model coupled to (2+1)-dimensional anti-de Sitter gravity. The obtained solutions are not self-dual under static metric. The usual regular topological lump solution cannot form a black hole even though the scale of symmetry breaking is increased. The... |
2401.09477 | \"Ozg\"ur \"Okc\"u | \"Ozg\"ur \"Okc\"u | Investigation of generalised uncertainty principle effects on FRW
cosmology | 22 pages, 3 figures, 4 tables, 1 appendix | NPB 1004 (2024) 116551 | 10.1016/j.nuclphysb.2024.116551 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Based on the entropy-area relation from Nouicer's generalised uncertainty
principle (GUP), we derive the GUP modified Friedmann equations from the first
law of thermodynamics at apparent horizon. We find a minimum apparent horizon
due to the minimal length notion of GUP. We show that the energy density of
universe ha... | [
{
"created": "Mon, 15 Jan 2024 02:06:37 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Apr 2024 23:07:30 GMT",
"version": "v2"
}
] | 2024-04-30 | [
[
"Ökcü",
"Özgür",
""
]
] | Based on the entropy-area relation from Nouicer's generalised uncertainty principle (GUP), we derive the GUP modified Friedmann equations from the first law of thermodynamics at apparent horizon. We find a minimum apparent horizon due to the minimal length notion of GUP. We show that the energy density of universe has ... |
2104.06631 | Kai Lin | Kai Lin, Yang-Yi Sun and Hongsheng Zhang | Quasinormal Modes for Dynamical Black Holes | null | Phys.Rev.D 103, 084015 (2021) | 10.1103/PhysRevD.103.084015 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | Realistic black holes are usually dynamical, noticeable or sluggish. The
Vaidya metric is a significant and tractable model for simulating a dynamical
black hole. In this study, we consider scalar perturbations in a dynamical
Vaidya black hole, and explore the quasinormal modes by employing the matrix
method. We find... | [
{
"created": "Wed, 14 Apr 2021 05:23:48 GMT",
"version": "v1"
}
] | 2021-04-15 | [
[
"Lin",
"Kai",
""
],
[
"Sun",
"Yang-Yi",
""
],
[
"Zhang",
"Hongsheng",
""
]
] | Realistic black holes are usually dynamical, noticeable or sluggish. The Vaidya metric is a significant and tractable model for simulating a dynamical black hole. In this study, we consider scalar perturbations in a dynamical Vaidya black hole, and explore the quasinormal modes by employing the matrix method. We find t... |
2111.13575 | Carla Rodrigues Almeida | Carla Rodrigues Almeida and Denis Campos Rodrigues | Quantization of a Black-Hole Gravity: geometrodynamics and the quantum
phase-space formalism | 13 pages, 3 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Quantum gravity is effective in domains where both quantum effects and
gravity are essential, such as in the vicinity of space-time singularities.
This paper will investigate the quantization of a black-hole gravity,
particularly the region surrounding the singularity at the origin of the
coordinate system. Describin... | [
{
"created": "Fri, 26 Nov 2021 16:19:47 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Feb 2022 11:26:46 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Sep 2022 19:09:50 GMT",
"version": "v3"
}
] | 2022-09-16 | [
[
"Almeida",
"Carla Rodrigues",
""
],
[
"Rodrigues",
"Denis Campos",
""
]
] | Quantum gravity is effective in domains where both quantum effects and gravity are essential, such as in the vicinity of space-time singularities. This paper will investigate the quantization of a black-hole gravity, particularly the region surrounding the singularity at the origin of the coordinate system. Describing ... |
2205.03312 | Riccardo Falcone | Riccardo Falcone and Claudio Conti | Observing single-particles beyond the Rindler horizon | null | Phys. Rev. A 107, 030203 (2023) | 10.1103/PhysRevA.107.L030203 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that Minkowski single-particle states localized beyond the horizon
modify the Unruh thermal distribution in an accelerated frame. This means that,
contrary to classical predictions, accelerated observers can reveal particles
emitted beyond the horizon. The method we adopt is based on deriving the
explicit Wig... | [
{
"created": "Fri, 6 May 2022 15:47:56 GMT",
"version": "v1"
}
] | 2023-06-06 | [
[
"Falcone",
"Riccardo",
""
],
[
"Conti",
"Claudio",
""
]
] | We show that Minkowski single-particle states localized beyond the horizon modify the Unruh thermal distribution in an accelerated frame. This means that, contrary to classical predictions, accelerated observers can reveal particles emitted beyond the horizon. The method we adopt is based on deriving the explicit Wigne... |
2005.13965 | Gon\c{c}alo Quinta | Gon\c{c}alo M. Quinta | Classical and Quantum Thermodynamic Systems in Curved Spacetime | PhD thesis, Instituto Superior Tecnico, December 2018. 189 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Systems at finite temperature make up the vast majority of realistic physical
scenarios. Indeed, although zero temperature is often accompanied by simpler
mathematics, the richness in physical results is evident when one considers the
system to have temperature and even more so if the background geometry is
curved. T... | [
{
"created": "Thu, 28 May 2020 13:10:17 GMT",
"version": "v1"
}
] | 2020-05-29 | [
[
"Quinta",
"Gonçalo M.",
""
]
] | Systems at finite temperature make up the vast majority of realistic physical scenarios. Indeed, although zero temperature is often accompanied by simpler mathematics, the richness in physical results is evident when one considers the system to have temperature and even more so if the background geometry is curved. Thi... |
0708.2013 | Peter D'Eath | A.N.St.J.Farley, P.D. D'Eath | Quantum amplitudes in black-hole evaporation: Spins 1 and 2 | null | AnnalsPhys.321:1334-1374,2006 | 10.1016/j.aop.2005.11.011 | null | gr-qc | null | Quantum amplitudes for $s=1$ at Maxwell fields and for $s=2$ linearised
gravitational wave perturbations of a spherically symmetric Einstein/massless
scalar background, describing gravitational collapse to a black hole, are
treated by analogy with a previous treatment of $s=0$ scalar-field
perturbations of gravitatio... | [
{
"created": "Wed, 15 Aug 2007 09:38:25 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Farley",
"A. N. St. J.",
""
],
[
"D'Eath",
"P. D.",
""
]
] | Quantum amplitudes for $s=1$ at Maxwell fields and for $s=2$ linearised gravitational wave perturbations of a spherically symmetric Einstein/massless scalar background, describing gravitational collapse to a black hole, are treated by analogy with a previous treatment of $s=0$ scalar-field perturbations of gravitationa... |
2311.06061 | Ajit Mehta | Ajit Kumar Mehta, Seth Olsen, Digvijay Wadekar, Javier Roulet, Tejaswi
Venumadhav, Jonathan Mushkin, Barak Zackay, Matias Zaldarriaga | New binary black hole mergers in the LIGO-Virgo O3b data | 16 pages, 12 figures | null | null | null | gr-qc astro-ph.HE astro-ph.IM | http://creativecommons.org/licenses/by/4.0/ | We report the detection of 6 new candidate binary black hole (BBH) merger
signals in the publicly released data from the second half of the third
observing run (O3b) of advanced LIGO and advanced Virgo. The LIGO-Virgo-KAGRA
(LVK) collaboration reported 35 compact binary coalescences (CBCs) in their
analysis of the O3... | [
{
"created": "Fri, 10 Nov 2023 13:50:45 GMT",
"version": "v1"
},
{
"created": "Sat, 4 May 2024 23:01:28 GMT",
"version": "v2"
}
] | 2024-05-07 | [
[
"Mehta",
"Ajit Kumar",
""
],
[
"Olsen",
"Seth",
""
],
[
"Wadekar",
"Digvijay",
""
],
[
"Roulet",
"Javier",
""
],
[
"Venumadhav",
"Tejaswi",
""
],
[
"Mushkin",
"Jonathan",
""
],
[
"Zackay",
"Barak",
""
],
... | We report the detection of 6 new candidate binary black hole (BBH) merger signals in the publicly released data from the second half of the third observing run (O3b) of advanced LIGO and advanced Virgo. The LIGO-Virgo-KAGRA (LVK) collaboration reported 35 compact binary coalescences (CBCs) in their analysis of the O3b ... |
1507.00103 | Prayush Kumar | Prayush Kumar, Kevin Barkett, Swetha Bhagwat, Nousha Afshari, Duncan
A. Brown, Geoffrey Lovelace, Mark A. Scheel, B\'ela Szil\'agyi | Accuracy and precision of gravitational-wave models of inspiraling
neutron star -- black hole binaries with spin: comparison with numerical
relativity in the low-frequency regime | 20 pages, 18 figures | Phys. Rev. D 92, 102001 (2015) | 10.1103/PhysRevD.92.102001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Coalescing binaries of neutron stars (NS) and black holes (BH) are one of the
most important sources of gravitational waves for the upcoming network of
ground based detectors. Detection and extraction of astrophysical information
from gravitational-wave signals requires accurate waveform models. The
Effective-One-Bod... | [
{
"created": "Wed, 1 Jul 2015 05:06:59 GMT",
"version": "v1"
}
] | 2016-08-08 | [
[
"Kumar",
"Prayush",
""
],
[
"Barkett",
"Kevin",
""
],
[
"Bhagwat",
"Swetha",
""
],
[
"Afshari",
"Nousha",
""
],
[
"Brown",
"Duncan A.",
""
],
[
"Lovelace",
"Geoffrey",
""
],
[
"Scheel",
"Mark A.",
""
],
... | Coalescing binaries of neutron stars (NS) and black holes (BH) are one of the most important sources of gravitational waves for the upcoming network of ground based detectors. Detection and extraction of astrophysical information from gravitational-wave signals requires accurate waveform models. The Effective-One-Body ... |
0906.1474 | Bijan Saha | Bijan Saha | Spinor model of a perfect fluid and their applications in Bianchi type-I
and FRW models | 10 pages, 8 Figures | Astrophys.Space Sci.331 (2011) 243 - 255 | 10.1007/s10509-010-0419-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Different characteristic of matter influencing the evolution of the Universe
has been simulated by means of a nonlinear spinor field. Exploiting the spinor
description of perfect fluid and dark energy evolution of the Universe given by
an anisotropic Bianchi type-I (BI) or isotropic Friedmann-Robertson-Walker
(FRW) o... | [
{
"created": "Mon, 8 Jun 2009 11:58:56 GMT",
"version": "v1"
}
] | 2015-05-01 | [
[
"Saha",
"Bijan",
""
]
] | Different characteristic of matter influencing the evolution of the Universe has been simulated by means of a nonlinear spinor field. Exploiting the spinor description of perfect fluid and dark energy evolution of the Universe given by an anisotropic Bianchi type-I (BI) or isotropic Friedmann-Robertson-Walker (FRW) one... |
1305.3479 | Michele Arzano | Michele Arzano, Stefano Bianco and Olaf Dreyer | From bricks to quasinormal modes: A new perspective on black hole
entropy | Honorable Mention in the 2013 Gravity Research Foundation Essay
Competition | null | 10.1142/S0218271813420273 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Calculations of black hole entropy based on the counting of modes of a
quantum field propagating in a Schwarzschild background need to be regularized
in the vicinity of the horizon. To obtain the Bekenstein-Hawking result the
short distance cut-off needs to be fixed by hand. In this note we give an
argument for obtai... | [
{
"created": "Wed, 15 May 2013 14:01:33 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Arzano",
"Michele",
""
],
[
"Bianco",
"Stefano",
""
],
[
"Dreyer",
"Olaf",
""
]
] | Calculations of black hole entropy based on the counting of modes of a quantum field propagating in a Schwarzschild background need to be regularized in the vicinity of the horizon. To obtain the Bekenstein-Hawking result the short distance cut-off needs to be fixed by hand. In this note we give an argument for obtaini... |
1006.4424 | Viktor G. Czinner | Viktor G. Czinner | Thick brane solutions and topology change transition on black hole
backgrounds | 11 pages, 10 figures, accepted for publication in Phys. Rev. D | Phys.Rev.D82:024035,2010 | 10.1103/PhysRevD.82.024035 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider static, axisymmetric, thick brane solutions on higher
dimensional, spherically symmetric black hole backgrounds. It was found
recently [1], that in cases when the thick brane has more than 2 spacelike
dimensions, perturbative approaches break down around the corresponding thin
solutions for Minkowski type... | [
{
"created": "Wed, 23 Jun 2010 06:24:34 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Czinner",
"Viktor G.",
""
]
] | We consider static, axisymmetric, thick brane solutions on higher dimensional, spherically symmetric black hole backgrounds. It was found recently [1], that in cases when the thick brane has more than 2 spacelike dimensions, perturbative approaches break down around the corresponding thin solutions for Minkowski type t... |
2302.02690 | Francois Larrouturou | Luc Blanchet and Lavinia Heisenberg and Fran\c{c}ois Larrouturou | Absence of gravitational polarization mechanism in the canonical
bimetric theory | 8 pages | Phys. Rev. D 107, 124021 (2023) | 10.1103/PhysRevD.107.124021 | DESY-23-010 | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | Motivated by a version of the ``Dipolar Dark Matter'' model, that aims at a
relativistic completion of the phenomenology of MOND, we investigate the
gravitational polarization mechanism in the canonical bimetric theory with an
effective matter coupling. We explicitly show the fundamental obstacle why such
theories ca... | [
{
"created": "Mon, 6 Feb 2023 10:46:40 GMT",
"version": "v1"
}
] | 2023-06-13 | [
[
"Blanchet",
"Luc",
""
],
[
"Heisenberg",
"Lavinia",
""
],
[
"Larrouturou",
"François",
""
]
] | Motivated by a version of the ``Dipolar Dark Matter'' model, that aims at a relativistic completion of the phenomenology of MOND, we investigate the gravitational polarization mechanism in the canonical bimetric theory with an effective matter coupling. We explicitly show the fundamental obstacle why such theories cann... |
2304.04180 | Abhik Kumar Sanyal Dr. | Manas Chakrabortty, Nayem Sk and Abhik Kumar Sanyal | A viable form of the metric Teleparallel F(T) theory of gravity | 12 pages, 0 figures | null | 10.1140/epjc/s10052-023-11741-2 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Unlike F(R) gravity, pure metric F(T) gravity in the vacuum dominated era,
ends up with an imaginary action and is therefore not feasible. This eerie
situation may only be circumvented by associating a scalar field, which can
also drive inflation in the very early universe. We show that, despite diverse
claims, F(T) ... | [
{
"created": "Sun, 9 Apr 2023 07:31:48 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Apr 2023 00:15:44 GMT",
"version": "v2"
}
] | 2023-07-26 | [
[
"Chakrabortty",
"Manas",
""
],
[
"Sk",
"Nayem",
""
],
[
"Sanyal",
"Abhik Kumar",
""
]
] | Unlike F(R) gravity, pure metric F(T) gravity in the vacuum dominated era, ends up with an imaginary action and is therefore not feasible. This eerie situation may only be circumvented by associating a scalar field, which can also drive inflation in the very early universe. We show that, despite diverse claims, F(T) th... |
1412.4003 | Sarfraz Ali | Muhammad Jamil Amir and Sarfraz Ali | Spherical Symmetric Gravitational Collapse in Chern-Simon Modified
Gravity | 17 page | Int. J. Theor. Phys. (2016) 55: 2040 | 10.1007/s10773-015-2844-3 | 3-015-2844-3 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is devoted to investigate the gravitational perfect fluid collapse
in the framework of Chern-Simon modified gravity. For this purpose, we assume
the spherically symmetric metric as an interior region and the Schwarzchild
spacetime is considered as an exterior region of the star. The Israel junction
conditi... | [
{
"created": "Thu, 11 Dec 2014 11:59:54 GMT",
"version": "v1"
},
{
"created": "Tue, 26 May 2015 10:39:49 GMT",
"version": "v2"
}
] | 2019-05-21 | [
[
"Amir",
"Muhammad Jamil",
""
],
[
"Ali",
"Sarfraz",
""
]
] | This paper is devoted to investigate the gravitational perfect fluid collapse in the framework of Chern-Simon modified gravity. For this purpose, we assume the spherically symmetric metric as an interior region and the Schwarzchild spacetime is considered as an exterior region of the star. The Israel junction condition... |
2310.00913 | Aneta Wojnar | Aleksander Kozak, Anna Pacho\l, Aneta Wojnar | Refining Bounds for Snyder and GUP Models through Seismic Wave Analysis | 8 pages, 3 figures, typos corrected | null | null | null | gr-qc astro-ph.EP hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This study investigates possibility of placing bounds on the parameters,
arising from the non-commutative Snyder space-time model and Generalized
Uncertainty Principle (GUP) approach, by utilizing seismic data. We investigate
the dependence of constraints on the type of realization used for the quantum
phase space. R... | [
{
"created": "Mon, 2 Oct 2023 05:58:23 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Apr 2024 09:17:10 GMT",
"version": "v2"
}
] | 2024-04-25 | [
[
"Kozak",
"Aleksander",
""
],
[
"Pachoł",
"Anna",
""
],
[
"Wojnar",
"Aneta",
""
]
] | This study investigates possibility of placing bounds on the parameters, arising from the non-commutative Snyder space-time model and Generalized Uncertainty Principle (GUP) approach, by utilizing seismic data. We investigate the dependence of constraints on the type of realization used for the quantum phase space. Res... |
1801.10548 | Saulo Carneiro | Saulo Carneiro | Can the cosmological dark sector be modeled by a single scalar field? | 5 pages, version to appear in Gen. Relativ. Gravit | Gen Relativ Gravit (2018) 50: 114 | 10.1007/s10714-018-2439-4 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a previous paper it was shown that a minimally coupled scalar field of
mass $M \sim H_0$ can describe both components of the dark sector in a unified
way. In the solution found, the dark energy component decays linearly with the
Hubble parameter, with a homogeneous creation of dark matter. In the present
note we s... | [
{
"created": "Wed, 31 Jan 2018 16:58:51 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Aug 2018 13:18:01 GMT",
"version": "v2"
}
] | 2018-08-22 | [
[
"Carneiro",
"Saulo",
""
]
] | In a previous paper it was shown that a minimally coupled scalar field of mass $M \sim H_0$ can describe both components of the dark sector in a unified way. In the solution found, the dark energy component decays linearly with the Hubble parameter, with a homogeneous creation of dark matter. In the present note we sho... |
gr-qc/0112001 | Jonathan Oppenheim | J. Oppenheim | A Thermodynamic Sector of Quantum Gravity | null | null | null | null | gr-qc | null | The connection between gravity and thermodynamics is explored. Examining a
perfect fluid in gravitational equilibrium we find that the entropy is extremal
only if Einstein's equations are satisfied. Conversely, one can derive part of
Einstein's equations from ordinary thermodynamical considerations. This allows
the t... | [
{
"created": "Tue, 4 Dec 2001 01:36:24 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Oppenheim",
"J.",
""
]
] | The connection between gravity and thermodynamics is explored. Examining a perfect fluid in gravitational equilibrium we find that the entropy is extremal only if Einstein's equations are satisfied. Conversely, one can derive part of Einstein's equations from ordinary thermodynamical considerations. This allows the the... |
gr-qc/0202105 | Pablo Laguna | Pablo Laguna and Deirdre Shoemaker (Penn State) | Numerical stability of a new conformal-traceless 3+1 formulation of the
Einstein equation | 7 pages, 2 figures | Class.Quant.Grav. 19 (2002) 3679-3686 | 10.1088/0264-9381/19/14/309 | null | gr-qc | null | There is strong evidence indicating that the particular form used to recast
the Einstein equation as a 3+1 set of evolution equations has a fundamental
impact on the stability properties of numerical evolutions involving black
holes and/or neutron stars. Presently, the longest lived evolutions have been
obtained usin... | [
{
"created": "Thu, 28 Feb 2002 20:10:07 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Laguna",
"Pablo",
"",
"Penn State"
],
[
"Shoemaker",
"Deirdre",
"",
"Penn State"
]
] | There is strong evidence indicating that the particular form used to recast the Einstein equation as a 3+1 set of evolution equations has a fundamental impact on the stability properties of numerical evolutions involving black holes and/or neutron stars. Presently, the longest lived evolutions have been obtained using ... |
1607.00364 | Hal Haggard | Hal M. Haggard and Carlo Rovelli | Quantum Gravity Effects around Sagittarius A* | 5 pages; Received honorable mention in the Gravity Research
Foundation 2016 Awards for Essays on Gravitation | null | 10.1142/S0218271816440211 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent VLBI observations have resolved Sagittarius A* at horizon scales. The
Event Horizon Telescope is expected to provide increasingly good images of the
region around the Schwarzschild radius $r_S$ of Sgr A* soon. A number of
authors have recently pointed out the possibility that non-perturbative quantum
gravitati... | [
{
"created": "Fri, 1 Jul 2016 19:39:10 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Jul 2016 19:50:15 GMT",
"version": "v2"
}
] | 2016-11-15 | [
[
"Haggard",
"Hal M.",
""
],
[
"Rovelli",
"Carlo",
""
]
] | Recent VLBI observations have resolved Sagittarius A* at horizon scales. The Event Horizon Telescope is expected to provide increasingly good images of the region around the Schwarzschild radius $r_S$ of Sgr A* soon. A number of authors have recently pointed out the possibility that non-perturbative quantum gravitation... |
1410.5065 | Shuxuan Ying | Peng Wang, Haitang Yang, Shuxuan Ying | Quantum gravity corrections to the tunneling radiation of scalar
particles | V1, 13 pages | null | null | CTP-SCU/2014008 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The original derivation of Hawking radiation shows the complete evaporation
of black holes. However, theories of quantum gravity predict the existence of
the minimal observable length. In this paper, we investigate the tunneling
radiation of the scalar particles by introducing quantum gravity effects
influenced by th... | [
{
"created": "Sun, 19 Oct 2014 12:47:44 GMT",
"version": "v1"
}
] | 2014-10-21 | [
[
"Wang",
"Peng",
""
],
[
"Yang",
"Haitang",
""
],
[
"Ying",
"Shuxuan",
""
]
] | The original derivation of Hawking radiation shows the complete evaporation of black holes. However, theories of quantum gravity predict the existence of the minimal observable length. In this paper, we investigate the tunneling radiation of the scalar particles by introducing quantum gravity effects influenced by the ... |
gr-qc/0005092 | Eduardo Sergio Santini | E. Sergio Santini | Quantum Geometrodynamics in the Bohm-de Broglie Interpretation | PhD Thesis at CBPF-Rio de Janeiro-May 2000 (Advisor: N. Pinto-Neto,
95 pages, in Portuguese) | null | null | null | gr-qc hep-th quant-ph | null | In this thesis the Bohm-de Broglie interpretation of quantum mechanics is
applied to canonical quantum gravity. It is shown that, irrespective of any
regularization or choice of factor ordering of the Wheeler-DeWitt equation, the
unique relevant quantum effect which does not break spacetime is the change of
its signa... | [
{
"created": "Mon, 22 May 2000 02:31:26 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Santini",
"E. Sergio",
""
]
] | In this thesis the Bohm-de Broglie interpretation of quantum mechanics is applied to canonical quantum gravity. It is shown that, irrespective of any regularization or choice of factor ordering of the Wheeler-DeWitt equation, the unique relevant quantum effect which does not break spacetime is the change of its signatu... |
2401.03187 | Shi-Jie Ma | Shi-Jie Ma, Rui-Bo Wang, Jian-Bo Deng, Xian-Ru Hu | Euler-Heisenberg black hole surrounded by perfect fluid dark matter | 34 pages, 11 figures | null | 10.1140/epjc/s10052-024-12914-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A generation method of new metric in the case of static spherically symmetric
space-time is derived. Using this approach, we construct a metric which
describes Euler-Heisenberg black hole surrounded by perfect fluid dark matter
and investigate its optical and thermodynamic properties. We found that radius
of shadow w... | [
{
"created": "Sat, 6 Jan 2024 10:23:13 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Jun 2024 07:23:23 GMT",
"version": "v2"
},
{
"created": "Thu, 13 Jun 2024 01:42:57 GMT",
"version": "v3"
}
] | 2024-06-14 | [
[
"Ma",
"Shi-Jie",
""
],
[
"Wang",
"Rui-Bo",
""
],
[
"Deng",
"Jian-Bo",
""
],
[
"Hu",
"Xian-Ru",
""
]
] | A generation method of new metric in the case of static spherically symmetric space-time is derived. Using this approach, we construct a metric which describes Euler-Heisenberg black hole surrounded by perfect fluid dark matter and investigate its optical and thermodynamic properties. We found that radius of shadow wil... |
gr-qc/9903108 | Bruce Allen | B. Allen, J.K. Blackburn, P.R. Brady, J.D.E. Creighton, T. Creighton,
S. Droz, A.D. Gillespie, S.A. Hughes, S. Kawamura, T.T. Lyons, J.E. Mason,
B.J. Owen, F.J. Raab, M.W. Regehr, B.S. Sathyaprakash, R.L. Savage, Jr., S.
Whitcomb, and A.G. Wiseman | Observational Limit on Gravitational Waves from Binary Neutron Stars in
the Galaxy | RevTeX, minor revisions, exactly as published in PRL 83 (1999) p1498,
4 pages, 2 figures included | Phys.Rev.Lett.83:1498,1999 | 10.1103/PhysRevLett.83.1498 | WISC-MILW-99-TH-05,LIGO-P990019-01 | gr-qc astro-ph | null | Using optimal matched filtering, we search 25 hours of data from the LIGO
40-meter prototype laser interferometric gravitational-wave detector for
gravitational-wave chirps emitted by coalescing binary systems within our
Galaxy. This is the first test of this filtering technique on real
interferometric data. An upper... | [
{
"created": "Wed, 31 Mar 1999 01:58:56 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Sep 1999 15:15:28 GMT",
"version": "v2"
}
] | 2012-08-27 | [
[
"Allen",
"B.",
""
],
[
"Blackburn",
"J. K.",
""
],
[
"Brady",
"P. R.",
""
],
[
"Creighton",
"J. D. E.",
""
],
[
"Creighton",
"T.",
""
],
[
"Droz",
"S.",
""
],
[
"Gillespie",
"A. D.",
""
],
[
"Hughes... | Using optimal matched filtering, we search 25 hours of data from the LIGO 40-meter prototype laser interferometric gravitational-wave detector for gravitational-wave chirps emitted by coalescing binary systems within our Galaxy. This is the first test of this filtering technique on real interferometric data. An upper l... |
gr-qc/9505030 | Eric Poisson | Eric Poisson | Gravitational radiation from a particle in circular orbit around a black
hole. VI. Accuracy of the post-Newtonian expansion | 5 pages, ReVTeX, 1 figure. A typographical error was discovered in
the computer code used to generate the results presented in the paper. The
corrected results are presented in an Erratum, which also incorporates new
results, obtained using the recently improved post-Newtonian calculations of
Tanaka, Tagoshi, a... | Phys.Rev. D52 (1995) 5719-5723; Addendum-ibid. D55 (1997)
7980-7981 | 10.1103/PhysRevD.52.5719 | null | gr-qc | null | A particle of mass $\mu$ moves on a circular orbit around a nonrotating black
hole of mass $M$. Under the assumption $\mu \ll M$ the gravitational waves
emitted by such a binary system can be calculated exactly numerically using
black-hole perturbation theory. If, further, the particle is slowly moving,
then the wave... | [
{
"created": "Wed, 17 May 1995 23:35:55 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Feb 1997 21:43:18 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Poisson",
"Eric",
""
]
] | A particle of mass $\mu$ moves on a circular orbit around a nonrotating black hole of mass $M$. Under the assumption $\mu \ll M$ the gravitational waves emitted by such a binary system can be calculated exactly numerically using black-hole perturbation theory. If, further, the particle is slowly moving, then the waves ... |
1304.1912 | Franco Fiorini | Franco Fiorini, P.A. Gonzalez and Yerko Vasquez | Compact extra dimensions in cosmologies with f(T) structure | 11 pages, one figure (added). Typos corrected, manuscript improved.
Additional material is contained in section IV. Accepted for publication in
Physical Review D | Phys. Rev. D 89 (2014) 024028 | 10.1103/PhysRevD.89.024028 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The presence of compact extra dimensions in cosmological scenarios in the
context of f(T)-like gravities is discussed. For the case of toroidal
compactifications, the analysis is performed in an arbitrary number of extra
dimensions. Spherical topologies for the extra dimensions are then carefully
studied in six and s... | [
{
"created": "Sat, 6 Apr 2013 16:56:12 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Jun 2013 02:51:06 GMT",
"version": "v2"
},
{
"created": "Mon, 16 Dec 2013 15:21:44 GMT",
"version": "v3"
}
] | 2015-06-15 | [
[
"Fiorini",
"Franco",
""
],
[
"Gonzalez",
"P. A.",
""
],
[
"Vasquez",
"Yerko",
""
]
] | The presence of compact extra dimensions in cosmological scenarios in the context of f(T)-like gravities is discussed. For the case of toroidal compactifications, the analysis is performed in an arbitrary number of extra dimensions. Spherical topologies for the extra dimensions are then carefully studied in six and sev... |
gr-qc/0204070 | G. Asanov | G.S. Asanov | Finslerian Anisotropic Relativistic Metric Function Obtainable under
Breakdown of Rotational Symmetry | null | null | null | null | gr-qc | null | We undertake to show how the relativistic Finslerian Metric Function (FMF)
should arise under uni-directional violation of spatial isotropy, keeping the
condition that the indicatrix (mass-shell) is a space of constant negative
curvature. By evaluating respective Finslerian tetrads, and treating them
consistently as ... | [
{
"created": "Mon, 22 Apr 2002 11:52:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Asanov",
"G. S.",
""
]
] | We undertake to show how the relativistic Finslerian Metric Function (FMF) should arise under uni-directional violation of spatial isotropy, keeping the condition that the indicatrix (mass-shell) is a space of constant negative curvature. By evaluating respective Finslerian tetrads, and treating them consistently as th... |
2204.02786 | Eduardo Am\^ancio Barbosa Oliveira | Eduardo Amancio Barbosa Oliveira (Instituto de Fisica Teorica -
Universidade Estadual Paulista) | Vacuum Energy in Modern Cosmology: an analysis of quantum field theory
in curved spaces and its application to cosmological spacetimes | 246 pages | null | 10.11606/D.76.2022.tde-06042022-100329 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The last decades have witnessed an unprecedented advancement in our knowledge
of the large scale universe. In particular, increasingly accurate cosmological
observations have allowed us to discover a form of "dark energy", which
presently dominates the expansion of the universe. On the other hand,
fundamental problem... | [
{
"created": "Mon, 4 Apr 2022 20:05:31 GMT",
"version": "v1"
}
] | 2022-04-11 | [
[
"Oliveira",
"Eduardo Amancio Barbosa",
"",
"Instituto de Fisica Teorica -\n Universidade Estadual Paulista"
]
] | The last decades have witnessed an unprecedented advancement in our knowledge of the large scale universe. In particular, increasingly accurate cosmological observations have allowed us to discover a form of "dark energy", which presently dominates the expansion of the universe. On the other hand, fundamental problems ... |
1307.1331 | Abhay Ashtekar | Abhay Ashtekar | A new perspective on CP and T violation | 10 pages; `Formal Response' to the talk "Three Merry Roads to
T-Violation" by Bryan Roberts at the Workshop on Cosmology and Time, held at
the Institute for Gravitation and the Cosmos, Penn State, in April 2013 | Stud. Hist. Phil. Mod. Phys. 52, 16-20 (2015) | null | IGC/13-06/5 | gr-qc hep-th math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that the results of CP and T violation experiments can be
interpreted using a very general framework that does not require a Hilbert
space of states or linear operators to represent the symmetries or dynamics.
Analysis within this general framework brings out the aspects of quantum
mechanics that are esse... | [
{
"created": "Thu, 4 Jul 2013 13:58:00 GMT",
"version": "v1"
}
] | 2016-02-16 | [
[
"Ashtekar",
"Abhay",
""
]
] | It is shown that the results of CP and T violation experiments can be interpreted using a very general framework that does not require a Hilbert space of states or linear operators to represent the symmetries or dynamics. Analysis within this general framework brings out the aspects of quantum mechanics that are essent... |
0806.2184 | Xin Li | Zhe Chang and Xin Li | Modified Newton's gravity in Finsler Space as a possible alternative to
dark matter hypothesis | some changes have been added, to be published in Phy. Lett. B | Phys.Lett.B668:453-456,2008 | 10.1016/j.physletb.2008.09.010 | null | gr-qc | http://creativecommons.org/licenses/by/3.0/ | A modified Newton's gravity is obtained as the weak field approximation of
the Einstein's equation in Finsler space. It is found that a specified Finsler
structure makes the modified Newton's gravity equivalent to the modified
Newtonian dynamics (MOND). In the framework of Finsler geometry, the flat
rotation curves o... | [
{
"created": "Fri, 13 Jun 2008 04:57:11 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Sep 2008 10:37:55 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Chang",
"Zhe",
""
],
[
"Li",
"Xin",
""
]
] | A modified Newton's gravity is obtained as the weak field approximation of the Einstein's equation in Finsler space. It is found that a specified Finsler structure makes the modified Newton's gravity equivalent to the modified Newtonian dynamics (MOND). In the framework of Finsler geometry, the flat rotation curves of ... |
gr-qc/9907009 | Akihiro Ishibashi | Akihiro Ishibashi and Akio Hosoya | Who's Afraid of Naked Singularities? | 25 pages, 3 figures, Accepted for publication in Phys.Rev.D | Phys.Rev. D60 (1999) 104028 | 10.1103/PhysRevD.60.104028 | YITP-99-6, TIT/HEP-414/COSMO-91 | gr-qc | null | To probe naked spacetime singularities with waves rather than with particles
we study the well-posedness of initial value problems for test scalar fields
with finite energy so that the natural function space of initial data is the
Sobolev space. In the case of static and conformally static spacetimes we
examine the e... | [
{
"created": "Sat, 3 Jul 1999 08:55:18 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Ishibashi",
"Akihiro",
""
],
[
"Hosoya",
"Akio",
""
]
] | To probe naked spacetime singularities with waves rather than with particles we study the well-posedness of initial value problems for test scalar fields with finite energy so that the natural function space of initial data is the Sobolev space. In the case of static and conformally static spacetimes we examine the ess... |
1811.02697 | Fernando Zago | Fernando Zago and Arthur Kosowsky | Quantum Particle Production Effects on Cosmic Expansion | null | Phys. Rev. D 100, 045023 (2019) | 10.1103/PhysRevD.100.045023 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum fields in cosmological spacetimes can experience particle production
due to their interaction with the expanding background. This effect is
particularly relevant for models of the very early Universe, when the energy
density generated through this process may back-react on the cosmological
expansion. Yet, the... | [
{
"created": "Tue, 6 Nov 2018 22:34:39 GMT",
"version": "v1"
}
] | 2019-09-04 | [
[
"Zago",
"Fernando",
""
],
[
"Kosowsky",
"Arthur",
""
]
] | Quantum fields in cosmological spacetimes can experience particle production due to their interaction with the expanding background. This effect is particularly relevant for models of the very early Universe, when the energy density generated through this process may back-react on the cosmological expansion. Yet, these... |
gr-qc/0611092 | Pavel Krtous | Lenka Havrdova, Pavel Krtous | Melvin universe as a limit of the C-metric | 5 pages, no figures [v2: two references added] | Gen.Rel.Grav.39:291-296,2007 | 10.1007/s10714-006-0381-3 | null | gr-qc | null | It is demonstrated that the Melvin universe representing the spacetime with a
strong 'homogeneous' electric field can by obtained from the spacetime of two
accelerated charged black holes by a suitable limiting procedure. The behavior
of various invariantly defined geometrical quantities in this limit is also
studied... | [
{
"created": "Fri, 17 Nov 2006 04:55:27 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Jan 2007 12:22:29 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Havrdova",
"Lenka",
""
],
[
"Krtous",
"Pavel",
""
]
] | It is demonstrated that the Melvin universe representing the spacetime with a strong 'homogeneous' electric field can by obtained from the spacetime of two accelerated charged black holes by a suitable limiting procedure. The behavior of various invariantly defined geometrical quantities in this limit is also studied. |
1810.08830 | Grigoris Panotopoulos | Grigoris Panotopoulos and \'Angel Rinc\'on | Minimal Geometric Deformation in a cloud of strings | 6 pages, 3 figures, accepted for publication in EPJC | null | 10.1140/epjc/s10052-018-6321-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find new exact analytical solutions in three-dimensional gravity applying
the Minimal Geometric Deformation approach in a cloud of strings.
| [
{
"created": "Sat, 20 Oct 2018 17:27:21 GMT",
"version": "v1"
}
] | 2018-11-14 | [
[
"Panotopoulos",
"Grigoris",
""
],
[
"Rincón",
"Ángel",
""
]
] | We find new exact analytical solutions in three-dimensional gravity applying the Minimal Geometric Deformation approach in a cloud of strings. |
gr-qc/0307018 | Alexander E. Shalyt-Margolin | A.E.Shalyt-Margolin, A.Ya.Tregubovich | Generalized Uncertainty Relation in Thermodynamics | 7 pages, no figures,new references | null | null | null | gr-qc | null | It is done by introducing of an additional term proportional to the interior
energy into the standard thermodynamic uncertainty relation that leads to
existence of the lower limit of inverse temperature
| [
{
"created": "Fri, 4 Jul 2003 09:35:13 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Aug 2003 10:40:23 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Shalyt-Margolin",
"A. E.",
""
],
[
"Tregubovich",
"A. Ya.",
""
]
] | It is done by introducing of an additional term proportional to the interior energy into the standard thermodynamic uncertainty relation that leads to existence of the lower limit of inverse temperature |
1910.09564 | Shahar Hod | Shahar Hod | Strong Cosmic Censorship and the Universal Relaxation Bound | 8 pages | Nuclear Physics B 948, 114772 (2019) | 10.1016/j.nuclphysb.2019.114772 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The strong cosmic censorship conjecture, introduced by Penrose five decades
ago, asserts that, in self-consistent theories of gravity, Cauchy horizons
inside dynamically formed black holes should be unstable to remnant
perturbation fields that fall into the newly born black holes. The question of
the (in)validity of ... | [
{
"created": "Mon, 21 Oct 2019 18:00:06 GMT",
"version": "v1"
}
] | 2019-10-30 | [
[
"Hod",
"Shahar",
""
]
] | The strong cosmic censorship conjecture, introduced by Penrose five decades ago, asserts that, in self-consistent theories of gravity, Cauchy horizons inside dynamically formed black holes should be unstable to remnant perturbation fields that fall into the newly born black holes. The question of the (in)validity of th... |
1006.2535 | Karl Wette | LIGO Scientific Collaboration: J. Abadie, B. P. Abbott, R. Abbott, M.
Abernathy, C. Adams, R. Adhikari, P. Ajith, B. Allen, G. Allen, E. Amador
Ceron, R. S. Amin, S. B. Anderson, W. G. Anderson, M. A. Arain, M. Araya, M.
Aronsson, Y. Aso, S. Aston, D. E. Atkinson, P. Aufmuth, C. Aulbert, S. Babak,
P. Baker, S. ... | First search for gravitational waves from the youngest known neutron
star | 26 pages, 5 figures | Astrophys.J.722:1504-1513,2010 | 10.1088/0004-637X/722/2/1504 | LIGO-P1000028-v7 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a search for periodic gravitational waves from the neutron star in
the supernova remnant Cassiopeia A. The search coherently analyzes data in a
12-day interval taken from the fifth science run of the Laser Interferometer
Gravitational-Wave Observatory. It searches gravitational wave frequencies from
100 to... | [
{
"created": "Sun, 13 Jun 2010 13:38:05 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Sep 2010 14:27:12 GMT",
"version": "v2"
}
] | 2014-11-21 | [
[
"LIGO Scientific Collaboration",
"",
""
],
[
"Abadie",
"J.",
""
],
[
"Abbott",
"B. P.",
""
],
[
"Abbott",
"R.",
""
],
[
"Abernathy",
"M.",
""
],
[
"Adams",
"C.",
""
],
[
"Adhikari",
"R.",
""
],
[
"A... | We present a search for periodic gravitational waves from the neutron star in the supernova remnant Cassiopeia A. The search coherently analyzes data in a 12-day interval taken from the fifth science run of the Laser Interferometer Gravitational-Wave Observatory. It searches gravitational wave frequencies from 100 to 3... |
gr-qc/0204014 | Gobinda Mujumder | A. Bhadra (University of North Bengal) | General relativity limit of the scalar-tensor theories for traceless
matter field | 9 pages, no figures, Latex | null | null | null | gr-qc | null | $\omega(\phi) \to \infty$ limit of scalar tensor theories are studied for
traceless matter source. It is shown that the limit $\omega(\phi) \to \infty$
does not reduce a scalar tensor theory to general relativity.
An exact radiation solution of scalar tensor cosmology under Nordtvedt
conditions is obtained for flat... | [
{
"created": "Wed, 3 Apr 2002 08:31:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bhadra",
"A.",
"",
"University of North Bengal"
]
] | $\omega(\phi) \to \infty$ limit of scalar tensor theories are studied for traceless matter source. It is shown that the limit $\omega(\phi) \to \infty$ does not reduce a scalar tensor theory to general relativity. An exact radiation solution of scalar tensor cosmology under Nordtvedt conditions is obtained for flat Fri... |
2003.04928 | Paola Carolina Moreira Delgado | P. C. M. Delgado and N. Pinto-Neto | Cosmological models with asymmetric quantum bounces | 10 pages, 6 figures; correction in section III B, main results
unchanged; references added. This is an author-created, un-copyedited version
of an article published in Classical and Quantum Gravity. IOP Publishing Ltd
is not responsible for any errors or omissions in this version of the
manuscript or any versio... | Class. Quantum Grav. 37 125002 (2020) | 10.1088/1361-6382/ab8bb8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In quantum cosmology, one has to select a specific wave function solution of
the quantum state equations under consideration in order to obtain concrete
results. The simplest choices have been already explored, in different
frameworks, yielding, in many cases, quantum bounces. As there is no
consensually established ... | [
{
"created": "Tue, 10 Mar 2020 18:52:02 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Sep 2021 16:57:00 GMT",
"version": "v2"
}
] | 2021-09-06 | [
[
"Delgado",
"P. C. M.",
""
],
[
"Pinto-Neto",
"N.",
""
]
] | In quantum cosmology, one has to select a specific wave function solution of the quantum state equations under consideration in order to obtain concrete results. The simplest choices have been already explored, in different frameworks, yielding, in many cases, quantum bounces. As there is no consensually established bo... |
gr-qc/0611088 | Alan D. Rendall | Alan D. Rendall | Late-time oscillatory behaviour for self-gravitating scalar fields | 17 pages, additional references | Class.Quant.Grav.24:667-678,2007 | 10.1088/0264-9381/24/3/010 | AEI-2006-082 | gr-qc | null | This paper investigates the late-time behaviour of certain cosmological
models where oscillations play an essential role. Rigorous results are proved
on the asymptotics of homogeneous and isotropic spacetimes with a linear
massive scalar field as source. Various generalizations are obtained for
nonlinear massive scal... | [
{
"created": "Thu, 16 Nov 2006 15:21:11 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Nov 2006 13:04:27 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Rendall",
"Alan D.",
""
]
] | This paper investigates the late-time behaviour of certain cosmological models where oscillations play an essential role. Rigorous results are proved on the asymptotics of homogeneous and isotropic spacetimes with a linear massive scalar field as source. Various generalizations are obtained for nonlinear massive scalar... |
gr-qc/0505033 | Thomas Thiemann | Johannes Brunnemann, Thomas Thiemann | Unboundedness of Triad -- Like Operators in Loop Quantum Gravity | 57 pages, 19 figures | Class.Quant.Grav. 23 (2006) 1429-1484 | 10.1088/0264-9381/23/5/002 | AEI-2005-099 | gr-qc astro-ph hep-th math-ph math.MP | null | In this paper we deliver the proofs for the claims, made in a companion
paper, concerning the avoidance of cosmological curvature singularities in in
full Loop Quantum Gravity (LQG).
| [
{
"created": "Sun, 8 May 2005 20:55:02 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Brunnemann",
"Johannes",
""
],
[
"Thiemann",
"Thomas",
""
]
] | In this paper we deliver the proofs for the claims, made in a companion paper, concerning the avoidance of cosmological curvature singularities in in full Loop Quantum Gravity (LQG). |
0909.0487 | L\'aszl\'o \'A Gergely | L\'aszl\'o \'A. Gergely, Peter L. Biermann, Bal\'azs Mik\'oczi,
Zolt\'an Keresztes | Renormalized spin coefficients in the accumulated orbital phase for
unequal mass black hole binaries | 10 pages, to appear in Class. Quantum Grav. GWDAW13 Proceedings
Special Issue, v2: no typos conjecture | Class.Quant.Grav.26:204006,2009 | 10.1088/0264-9381/26/20/204006 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze galactic black hole mergers and their emitted gravitational waves.
Such mergers have typically unequal masses with mass ratio of the order 1/10.
The emitted gravitational waves carry the inprint of spins and mass quadrupoles
of the binary components. Among these contributions, we consider here the
quasi-pr... | [
{
"created": "Wed, 2 Sep 2009 18:14:40 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Sep 2009 20:37:59 GMT",
"version": "v2"
}
] | 2009-11-18 | [
[
"Gergely",
"László Á.",
""
],
[
"Biermann",
"Peter L.",
""
],
[
"Mikóczi",
"Balázs",
""
],
[
"Keresztes",
"Zoltán",
""
]
] | We analyze galactic black hole mergers and their emitted gravitational waves. Such mergers have typically unequal masses with mass ratio of the order 1/10. The emitted gravitational waves carry the inprint of spins and mass quadrupoles of the binary components. Among these contributions, we consider here the quasi-prec... |
2405.18502 | Jarmo M\"akel\"a Dr. | Jarmo M\"akel\"a | A Possible Quantum Effect of Gravitation | 23 pages, no figures. Accepted for publication in the General
Relativity and Gravitation. Comments welcome! | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Beginning from the standard Arnowitt-Deser-Misner (ADM) formulation of
general relativity we construct a tentative model of quantum gravity from the
point of view of an observer with constant proper acceleration, just outside of
a horizon of spacetime. In addition of producing the standard results of
black-hole therm... | [
{
"created": "Tue, 28 May 2024 18:14:02 GMT",
"version": "v1"
}
] | 2024-05-30 | [
[
"Mäkelä",
"Jarmo",
""
]
] | Beginning from the standard Arnowitt-Deser-Misner (ADM) formulation of general relativity we construct a tentative model of quantum gravity from the point of view of an observer with constant proper acceleration, just outside of a horizon of spacetime. In addition of producing the standard results of black-hole thermod... |
gr-qc/9411016 | Jesus Barbero | J. Fernando Barbero | Solving the Constraints of General Relativity | 8 pages, LATEX, no figures, Preprint CGPG-94/11-3 | Class.Quant.Grav.12:L5-L10,1995 | 10.1088/0264-9381/12/2/001 | null | gr-qc | null | I show in this letter that it is possible to solve some of the constraints of
the $SO(3)$-ADM formalism for general relativity by using an approach similar
to the one introduced by Capovilla, Dell and Jacobson to solve the vector and
scalar constraints in the Ashtekar variables framework. I discuss the
advantages of ... | [
{
"created": "Mon, 7 Nov 1994 20:58:12 GMT",
"version": "v1"
}
] | 2017-03-24 | [
[
"Barbero",
"J. Fernando",
""
]
] | I show in this letter that it is possible to solve some of the constraints of the $SO(3)$-ADM formalism for general relativity by using an approach similar to the one introduced by Capovilla, Dell and Jacobson to solve the vector and scalar constraints in the Ashtekar variables framework. I discuss the advantages of us... |
1306.6216 | Adam Chudecki Dr | Adam Chudecki | Null Killing vectors and geometry of null strings in Einstein spaces | null | Gen. Relativ. Gravit. (2014) 46: 1714 | 10.1007/s10714-014-1714-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Einstein complex spacetimes admitting null Killing or null homothetic Killing
vectors are studied. These vectors define totally null and geodesic 2-surfaces
called the null strings or twistor surfaces. Geometric properties of these null
strings are discussed. It is shown, that spaces considered are hyperheavenly
spac... | [
{
"created": "Wed, 26 Jun 2013 12:14:05 GMT",
"version": "v1"
}
] | 2014-04-17 | [
[
"Chudecki",
"Adam",
""
]
] | Einstein complex spacetimes admitting null Killing or null homothetic Killing vectors are studied. These vectors define totally null and geodesic 2-surfaces called the null strings or twistor surfaces. Geometric properties of these null strings are discussed. It is shown, that spaces considered are hyperheavenly spaces... |
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