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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/0304047 | J. Fernando Barbero G. | J. Fernando Barbero G., Guillermo A. Mena Marugan, Eduardo J. S.
Villase\~nor | Microcausality and Quantum Cylindrical Gravitational Waves | 12 pages, 4 figures, accepted for publication in Physical Review D | Phys.Rev.D67:124006,2003 | 10.1103/PhysRevD.67.124006 | null | gr-qc | null | We study several issues related to the different choices of time available
for the classical and quantum treatment of linearly polarized cylindrical
gravitational waves. We pay especial attention to the time evolution of
creation and annihilation operators and the definition of Fock spaces for the
different choices o... | [
{
"created": "Fri, 11 Apr 2003 10:53:23 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"G.",
"J. Fernando Barbero",
""
],
[
"Marugan",
"Guillermo A. Mena",
""
],
[
"Villaseñor",
"Eduardo J. S.",
""
]
] | We study several issues related to the different choices of time available for the classical and quantum treatment of linearly polarized cylindrical gravitational waves. We pay especial attention to the time evolution of creation and annihilation operators and the definition of Fock spaces for the different choices of ... |
1401.5369 | James Dilts | James Dilts and Jeremy Leach | A limit equation criterion for applying the conformal method to
asymptotically cylindrical initial data sets | 21 pages | null | null | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove that in a certain class of conformal data on an asymptotically
cylindrical manifold, if the conformally decomposed Einstein constraint
equations do not admit a solution, then one can always find a nontrivial
solution to the limit equation first explored by Dahl, Gicquaud, and Humbert in
[DGH11]. We also give... | [
{
"created": "Tue, 21 Jan 2014 16:21:21 GMT",
"version": "v1"
}
] | 2014-01-22 | [
[
"Dilts",
"James",
""
],
[
"Leach",
"Jeremy",
""
]
] | We prove that in a certain class of conformal data on an asymptotically cylindrical manifold, if the conformally decomposed Einstein constraint equations do not admit a solution, then one can always find a nontrivial solution to the limit equation first explored by Dahl, Gicquaud, and Humbert in [DGH11]. We also give a... |
gr-qc/0603022 | Jerzy Kowalski-Glikman | Jerzy Kowalski-Glikman | Doubly Special Relativity: facts and prospects | Submitted to the volume "Approaches to Quantum Gravity - toward a new
understanding of space, time, and matter", D. Oriti ed | null | null | null | gr-qc | null | In this short review of Doubly Special Relativity I describe first the
relations between DSR and (quantum) gravity. Then I show how, in the case of a
field theory with curved momentum space, the Hopf algebra of symmetries
naturally emerges. I conclude with some remarks concerning DSR phenomenology
and description of ... | [
{
"created": "Wed, 8 Mar 2006 08:26:07 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kowalski-Glikman",
"Jerzy",
""
]
] | In this short review of Doubly Special Relativity I describe first the relations between DSR and (quantum) gravity. Then I show how, in the case of a field theory with curved momentum space, the Hopf algebra of symmetries naturally emerges. I conclude with some remarks concerning DSR phenomenology and description of op... |
2107.02065 | Horacio Santana Vieira | H. S. Vieira | Quasibound States, Stability and Wave Functions of the Test Fields in
the Consistent 4D Einstein-Gauss-Bonnet Gravity | 17 pages, 7 figures. Matches published version in Universe | Universe 2023, 9(5), 205 | 10.3390/universe9050205 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the interaction between quantum test particles and the
gravitational field generated by a black hole solution that was recently
obtained in the consistent 4-dimensional Einstein-Gauss-Bonnet gravity. While
quasinormal modes of scalar, electromagnetic, and Dirac fields have been
recently studied in this the... | [
{
"created": "Mon, 5 Jul 2021 14:55:39 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Apr 2023 16:59:14 GMT",
"version": "v2"
}
] | 2023-04-27 | [
[
"Vieira",
"H. S.",
""
]
] | We examine the interaction between quantum test particles and the gravitational field generated by a black hole solution that was recently obtained in the consistent 4-dimensional Einstein-Gauss-Bonnet gravity. While quasinormal modes of scalar, electromagnetic, and Dirac fields have been recently studied in this theor... |
1202.4154 | Mohammad Malekjani | M. Malekjani and A. Khodam-Mohammadi | Statefinder diagnosis and the interacting ghost model of dark energy | 23 pages, 6 figures | Astrophys Space Sci (2013) 343, 451461 | 10.1007/s10509-012-1230-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new model of dark energy namely "ghost dark energy model" has recently been
suggested to interpret the positive acceleration of cosmic expansion. The
energy density of ghost dark energy is proportional to the hubble parameter. In
this paper we perform the statefinder diagnostic tool for this model both in
flat and ... | [
{
"created": "Sun, 19 Feb 2012 14:25:34 GMT",
"version": "v1"
}
] | 2015-06-04 | [
[
"Malekjani",
"M.",
""
],
[
"Khodam-Mohammadi",
"A.",
""
]
] | A new model of dark energy namely "ghost dark energy model" has recently been suggested to interpret the positive acceleration of cosmic expansion. The energy density of ghost dark energy is proportional to the hubble parameter. In this paper we perform the statefinder diagnostic tool for this model both in flat and no... |
gr-qc/0503079 | Sung Won Kim | Soon-Tae Hong and Sung-Won Kim | Hydrodynamics and global structure of rotating Schwarzschild black holes | 6 pages, 2 figures | J.Korean Phys.Soc. 49 (2006) S748-S754 | null | null | gr-qc | null | Exploiting a rotating Schwarzschild black hole metric, we study hydrodynamic
properties of perfect fluid whirling inward toward the black holes along a
conical surface. On the equatorial plane of the rotating Schwarzschild black
hole, we derive radial equations of motion with effective potentials and the
Euler equati... | [
{
"created": "Fri, 18 Mar 2005 05:25:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hong",
"Soon-Tae",
""
],
[
"Kim",
"Sung-Won",
""
]
] | Exploiting a rotating Schwarzschild black hole metric, we study hydrodynamic properties of perfect fluid whirling inward toward the black holes along a conical surface. On the equatorial plane of the rotating Schwarzschild black hole, we derive radial equations of motion with effective potentials and the Euler equation... |
1712.04731 | Filippo Vernizzi | Alexandru Dima and Filippo Vernizzi | Vainshtein Screening in Scalar-Tensor Theories before and after
GW170817: Constraints on Theories beyond Horndeski | 7 pages, 1 figure. Added references, corrected inconsequential typos
in eq. (3) and (4), added discussion on the third Vainshtein screening branch
and improved constraints in the Note added | Phys. Rev. D 97, 101302 (2018) | 10.1103/PhysRevD.97.101302 | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Screening mechanisms are essential features of dark energy models mediating a
fifth force on large scales. We study the regime of strong scalar field
nonlinearities, known as Vainshtein screening, in the most general
scalar-tensor theories propagating a single scalar degree of freedom. We first
develop an effective a... | [
{
"created": "Wed, 13 Dec 2017 12:19:39 GMT",
"version": "v1"
},
{
"created": "Mon, 14 May 2018 12:14:06 GMT",
"version": "v2"
}
] | 2018-06-06 | [
[
"Dima",
"Alexandru",
""
],
[
"Vernizzi",
"Filippo",
""
]
] | Screening mechanisms are essential features of dark energy models mediating a fifth force on large scales. We study the regime of strong scalar field nonlinearities, known as Vainshtein screening, in the most general scalar-tensor theories propagating a single scalar degree of freedom. We first develop an effective app... |
gr-qc/0609121 | Luc Blanchet | Luc Blanchet | Dipolar Particles in General Relativity | 33 pages, 6 figures, to appear in Classical and Quantum Gravity | Class.Quant.Grav.24:3541-3570,2007 | 10.1088/0264-9381/24/14/002 | null | gr-qc astro-ph | null | The dynamics of "dipolar particles", i.e. particles endowed with a
four-vector mass dipole moment, is investigated using an action principle in
general relativity. The action is a specific functional of the particle's world
line, and of the dipole moment vector, considered as a dynamical variable. The
first part of t... | [
{
"created": "Tue, 26 Sep 2006 18:31:06 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Mar 2007 15:14:58 GMT",
"version": "v2"
},
{
"created": "Fri, 22 Jun 2007 19:48:54 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Blanchet",
"Luc",
""
]
] | The dynamics of "dipolar particles", i.e. particles endowed with a four-vector mass dipole moment, is investigated using an action principle in general relativity. The action is a specific functional of the particle's world line, and of the dipole moment vector, considered as a dynamical variable. The first part of the... |
gr-qc/9904084 | Ian H. Redmount | Ian H. Redmount | ``Natural'' Vacua in Hyperbolic Friedmann-Robertson-Walker Spacetimes | 7 pages, 0 figures | Phys.Rev. D60 (1999) 104004 | 10.1103/PhysRevD.60.104004 | null | gr-qc | null | Recent evidence indicates that the Universe is open, i.e., spatially
hyperbolic, longstanding theoretical preferences to the contrary
notwithstanding. This makes it possible to select a vacuum state, Fock space,
and particle definition for a quantized field, by requiring concordance with
ordinary flat-spacetime theor... | [
{
"created": "Fri, 30 Apr 1999 20:02:53 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Redmount",
"Ian H.",
""
]
] | Recent evidence indicates that the Universe is open, i.e., spatially hyperbolic, longstanding theoretical preferences to the contrary notwithstanding. This makes it possible to select a vacuum state, Fock space, and particle definition for a quantized field, by requiring concordance with ordinary flat-spacetime theory ... |
gr-qc/9301024 | null | J. Audretsch, A. Economou and C.O. Lousto | Topological Defects in Gravitational Theories with Non Linear
Lagrangians | LaTeX (uses revrex macros), 13 pages | Phys.Rev. D47 (1993) 3303-3311 | 10.1103/PhysRevD.47.3303 | null | gr-qc astro-ph hep-th | null | The gravitational field of monopoles, cosmic strings and domain walls is
studied in the quadratic gravitational theory $R+\alpha R^2$ with $\alpha
|R|\ll 1$, and is compared with the result in Einstein's theory. The metric
aquires modifications which correspond to a short range `Newtonian' potential
for gauge cosmic ... | [
{
"created": "Mon, 1 Feb 1993 15:38:31 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Audretsch",
"J.",
""
],
[
"Economou",
"A.",
""
],
[
"Lousto",
"C. O.",
""
]
] | The gravitational field of monopoles, cosmic strings and domain walls is studied in the quadratic gravitational theory $R+\alpha R^2$ with $\alpha |R|\ll 1$, and is compared with the result in Einstein's theory. The metric aquires modifications which correspond to a short range `Newtonian' potential for gauge cosmic st... |
1907.12261 | Andronikos Paliathanasis | Andronikos Paliathanasis | Conservation laws and Exact Solutions in Brans-Dicke Cosmology with a
Scalar Field | 14 pages, no figures, version to appear in General Relativity and
Gravitation | General Relativity and Gravitation volume 51, Article number: 101
(2019) | 10.1007/s10714-019-2585-3 | null | gr-qc hep-ph math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scalar-tensor theories have drawn the attention of cosmologist for the past
few years because they can provide mechanism to explain the observable
phenomena. Moreover, the results of scalar-tensor theories can be applied in
higher-order theories of gravity. In this work, we consider a Brans-Dicke
scalar field cosmolo... | [
{
"created": "Mon, 29 Jul 2019 08:18:42 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Aug 2019 09:33:46 GMT",
"version": "v2"
}
] | 2020-01-17 | [
[
"Paliathanasis",
"Andronikos",
""
]
] | Scalar-tensor theories have drawn the attention of cosmologist for the past few years because they can provide mechanism to explain the observable phenomena. Moreover, the results of scalar-tensor theories can be applied in higher-order theories of gravity. In this work, we consider a Brans-Dicke scalar field cosmologi... |
1406.4039 | Ivan Booth | Benjamin K. Tippett, Ivan Booth | Closest Safe Approach to an Accreting Black Hole | 15 pages, many figures, RevTex format | Phys. Rev. D 90, 084027 (2014) | 10.1103/PhysRevD.90.084027 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the causal and geometric horizons of dynamical black holes in
Lemaitre-Tolman-Bondi collapsing dust spacetimes. Marginally trapped tubes in
these spacetimes may be spacelike, timelike or null and may also be sourced
from or disappear into shell-crossing singularities which we resolve with
(timelike) shockw... | [
{
"created": "Mon, 16 Jun 2014 15:08:18 GMT",
"version": "v1"
}
] | 2014-10-22 | [
[
"Tippett",
"Benjamin K.",
""
],
[
"Booth",
"Ivan",
""
]
] | We examine the causal and geometric horizons of dynamical black holes in Lemaitre-Tolman-Bondi collapsing dust spacetimes. Marginally trapped tubes in these spacetimes may be spacelike, timelike or null and may also be sourced from or disappear into shell-crossing singularities which we resolve with (timelike) shockwav... |
1904.11209 | Tekin Dereli | Tekin Dereli and Yorgo Senikoglu | Gravitational Plane Waves in a Non-Riemannian Description of Brans-Dicke
Gravity | null | Phys.Scripta 95 (2020) no.4, 045223 | 10.1088/1402-4896/ab6eb7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The variational field equations of Brans-Dicke scalar-tensor theory of
gravitation are given in a non-Riemannian setting in the language of exterior
differential forms over 4-dimensional spacetime. The class of pp-wave metrics
together with the Brans-Dicke scalar field are used to derive the geodesic and
autoparallel... | [
{
"created": "Thu, 25 Apr 2019 08:44:06 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Oct 2019 16:05:50 GMT",
"version": "v2"
}
] | 2020-03-27 | [
[
"Dereli",
"Tekin",
""
],
[
"Senikoglu",
"Yorgo",
""
]
] | The variational field equations of Brans-Dicke scalar-tensor theory of gravitation are given in a non-Riemannian setting in the language of exterior differential forms over 4-dimensional spacetime. The class of pp-wave metrics together with the Brans-Dicke scalar field are used to derive the geodesic and autoparallel e... |
2307.15371 | Behzad Eslam Panah | B. Eslam Panah | Three-dimensional energy-dependent $C$-metric: black hole solutions | 8 pages, 2 figures, accepted in Physics Letters B | Phys. Lett. B 844 (2023) 138111 | 10.1016/j.physletb.2023.138111 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Considering a three-dimensional $C$-metric and adding energy-dependent to
this spacetime, we first create a three-dimensional energy-dependent
$C$-metric. Then, we extract accelerating BTZ black hole solutions in gravity's
rainbow. Besides, we show that (A)dS black holes cover by an event horizon that
depends on all ... | [
{
"created": "Fri, 28 Jul 2023 07:44:27 GMT",
"version": "v1"
}
] | 2023-08-09 | [
[
"Panah",
"B. Eslam",
""
]
] | Considering a three-dimensional $C$-metric and adding energy-dependent to this spacetime, we first create a three-dimensional energy-dependent $C$-metric. Then, we extract accelerating BTZ black hole solutions in gravity's rainbow. Besides, we show that (A)dS black holes cover by an event horizon that depends on all th... |
2103.04144 | Vasilis Oikonomou | A.V. Astashenok, S. Capozziello, S.D. Odintsov, V.K. Oikonomou | Causal Limit of Neutron Star Maximum Mass in $f(R)$ Gravity in View of
GW190814 | PLB Accepted | null | 10.1016/j.physletb.2021.136222 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the causal limit of maximum mass for stars in the framework
of$f(R)$ gravity. We choose a causal equation of state, with variable speed of
sound, and with the transition density and pressure corresponding to the SLy
equation of state. The transition density is chosen to be equal to twice the
saturation... | [
{
"created": "Sat, 6 Mar 2021 15:57:45 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Mar 2021 15:43:40 GMT",
"version": "v2"
}
] | 2021-04-07 | [
[
"Astashenok",
"A. V.",
""
],
[
"Capozziello",
"S.",
""
],
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K.",
""
]
] | We investigate the causal limit of maximum mass for stars in the framework of$f(R)$ gravity. We choose a causal equation of state, with variable speed of sound, and with the transition density and pressure corresponding to the SLy equation of state. The transition density is chosen to be equal to twice the saturation d... |
2305.03362 | Pardyumn Kumar Sahoo | Moreshwar Tayde, Sayantan Ghosh, P.K. Sahoo | Non-exotic static spherically symmetric thin-shell wormhole solution in
$f(Q,T)$ gravity | Chinese Physics C published version | Chinese Physics C 47(7) (2023) 075102 | 10.1088/1674-1137/acd2b7 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this study, we have conducted an analysis of traversable wormhole
solutions within the framework of linear $f(Q, T) = \alpha Q + \beta T$
gravity, ensuring that all the energy conditions hold for the entire spacetime.
The solutions presented in this study were derived through a comprehensive
analytical examination... | [
{
"created": "Fri, 5 May 2023 08:31:01 GMT",
"version": "v1"
}
] | 2023-06-13 | [
[
"Tayde",
"Moreshwar",
""
],
[
"Ghosh",
"Sayantan",
""
],
[
"Sahoo",
"P. K.",
""
]
] | In this study, we have conducted an analysis of traversable wormhole solutions within the framework of linear $f(Q, T) = \alpha Q + \beta T$ gravity, ensuring that all the energy conditions hold for the entire spacetime. The solutions presented in this study were derived through a comprehensive analytical examination o... |
2003.13374 | Jun Tsujimura | Jun Tsujimura, Yasusada Nambu | Null wave front as Ryu-Takayanagi surface | 18 pages, 9 figures | null | 10.3390/e22111297 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Ryu-Takayanagi formula provides the entanglement entropy of quantum field
theory as an area of the minimal surface (Ryu-Takayangi surface) in a
corresponding gravity theory. There are some attempts to understand the formula
as a flow rather than as a surface. In this paper, we propose that null rays
emitted from ... | [
{
"created": "Mon, 30 Mar 2020 12:09:12 GMT",
"version": "v1"
}
] | 2020-12-30 | [
[
"Tsujimura",
"Jun",
""
],
[
"Nambu",
"Yasusada",
""
]
] | The Ryu-Takayanagi formula provides the entanglement entropy of quantum field theory as an area of the minimal surface (Ryu-Takayangi surface) in a corresponding gravity theory. There are some attempts to understand the formula as a flow rather than as a surface. In this paper, we propose that null rays emitted from th... |
1711.09872 | Bernardo Araneda | Bernardo Araneda | Generalized wave operators, weighted Killing fields, and perturbations
of higher dimensional spacetimes | 57 pages | null | 10.1088/1361-6382/aab06a | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present weighted covariant derivatives and wave operators for
perturbations of certain algebraically special Einstein spacetimes in arbitrary
dimensions, under which the Teukolsky and related equations become weighted
wave equations. We show that the higher dimensional generalization of the
principal null directio... | [
{
"created": "Mon, 27 Nov 2017 18:42:48 GMT",
"version": "v1"
}
] | 2018-03-28 | [
[
"Araneda",
"Bernardo",
""
]
] | We present weighted covariant derivatives and wave operators for perturbations of certain algebraically special Einstein spacetimes in arbitrary dimensions, under which the Teukolsky and related equations become weighted wave equations. We show that the higher dimensional generalization of the principal null directions... |
gr-qc/0605012 | Zhong Chao Wu | Z.C.Wu | Dimensionality and the Cosmological Constant | 8 pages | Gen.Rel.Grav.38:381-386,2006 | 10.1007/s10714-005-0226-5 | ZJUT-2004-3 | gr-qc astro-ph hep-th | null | In the Kaluza-Klein model with a cosmological constant and a flux, the
external spacetime and its dimension of the created universe from a $S^s \times
S^{n-s}$ seed instanton can be identified in quantum cosmology. One can also
show that in the internal space the effective cosmological constant is most
probably zero.... | [
{
"created": "Mon, 1 May 2006 20:27:27 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Wu",
"Z. C.",
""
]
] | In the Kaluza-Klein model with a cosmological constant and a flux, the external spacetime and its dimension of the created universe from a $S^s \times S^{n-s}$ seed instanton can be identified in quantum cosmology. One can also show that in the internal space the effective cosmological constant is most probably zero. |
gr-qc/0107015 | Martin Tajmar | C.J. de Matos, M. Tajmar | Free Fall of a Cylindrical Mass Electrically Charged Bodies | null | null | null | null | gr-qc | null | The gravitational Poynting vector provides a mechanism for the transfer of
gravitational energy to a system of falling objects. In the following we will
show that the gravitational poynting vector together with the electromagnetic
Poynting vector provides a mechanism to explain how massive electrically
charged bodies... | [
{
"created": "Wed, 4 Jul 2001 07:35:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"de Matos",
"C. J.",
""
],
[
"Tajmar",
"M.",
""
]
] | The gravitational Poynting vector provides a mechanism for the transfer of gravitational energy to a system of falling objects. In the following we will show that the gravitational poynting vector together with the electromagnetic Poynting vector provides a mechanism to explain how massive electrically charged bodies a... |
gr-qc/9909062 | Dr. A. K. Mitra | Abhas Mitra (BARC, Theory Division, India) | Kruskal Dynamics For Radial Geodesics. I | 8 pages, REVTEX | null | null | null | gr-qc astro-ph | null | The total spacetime manifold for a Schwarzschild black hole (BH) is described
by the Kruskal coordinates u=u(r,t) and v=v(r,t), where r and t are the
conventional Schwarzschild radial and time coordinates respectively. The
relationship between r and t for a test particle moving on a radial or
non-radial geodesic is w... | [
{
"created": "Tue, 21 Sep 1999 07:28:03 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mitra",
"Abhas",
"",
"BARC, Theory Division, India"
]
] | The total spacetime manifold for a Schwarzschild black hole (BH) is described by the Kruskal coordinates u=u(r,t) and v=v(r,t), where r and t are the conventional Schwarzschild radial and time coordinates respectively. The relationship between r and t for a test particle moving on a radial or non-radial geodesic is wel... |
gr-qc/9811080 | F. Darabi | M. A. Jafarizadeh, F. Darabi, A. R. Rastegar | On Duru-Kleinert Path Integral In Quantum Cosmology | 9 pages, LaTeX | Phys.Lett. A248 (1998) 19-24 | 10.1016/S0375-9601(98)00595-7 | null | gr-qc | null | We show that the Duru-Kleinert fixed energy amplitude leads to the path
integral for the propagation amplitude in the closed FRW quantum cosmology with
scale factor as one degree of freedom. Then, using the Duru-Kleinert
equivalence of corresponding actions, we calculate the tunneling rate, with
exact prefactor, thro... | [
{
"created": "Tue, 24 Nov 1998 07:38:19 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Jafarizadeh",
"M. A.",
""
],
[
"Darabi",
"F.",
""
],
[
"Rastegar",
"A. R.",
""
]
] | We show that the Duru-Kleinert fixed energy amplitude leads to the path integral for the propagation amplitude in the closed FRW quantum cosmology with scale factor as one degree of freedom. Then, using the Duru-Kleinert equivalence of corresponding actions, we calculate the tunneling rate, with exact prefactor, throug... |
gr-qc/9912033 | Haret Rosu | H.C. Rosu, P. Espinoza | An Ermakov study of Q not zero EFRW minisuperspace oscillators | 5 pages, 4 figs embedded, parallel talk at 3rd Workshop of DGFM/SMF,
Nov. 28 - Dec. 3/99, Leon, Gto, Mx | Aspects of Gravitation and Mathematical Physics, The 3rd Workshop
of the DGFM-SMF, eds. N. Breton, O. Pimentel, J. Socorro, (Guanajuato
University, Mexico, 2000), ISBN 968-864-220-7 | null | null | gr-qc | null | A previous work on the Ermakov approach for empty FRW minisuperspace
universes of Hartle-Hawking factor ordering parameter Q=0 is extended to the Q
not zero cases
| [
{
"created": "Thu, 9 Dec 1999 00:00:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Rosu",
"H. C.",
""
],
[
"Espinoza",
"P.",
""
]
] | A previous work on the Ermakov approach for empty FRW minisuperspace universes of Hartle-Hawking factor ordering parameter Q=0 is extended to the Q not zero cases |
2401.17025 | Anjana Ashok | A. Ashok, P.B. Covas, R. Prix and M. A. Papa | Bayesian $\mathcal{F}$-statistic-based parameter estimation of
continuous gravitational waves from known pulsars | 15 pages, 17 figures, updated to match published version | Phys. Rev. D 109, 104002 (2024) | 10.1103/PhysRevD.109.104002 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We present a new method and implementation to obtain Bayesian posteriors on
the amplitude parameters $\{h_0, \cos \iota, \psi, \phi_0\}$ of
continuous-gravitational waves emitted by known pulsars. This approach
leverages the well-established $\mathcal{F}$-statistic framework and software.
We further explore the benef... | [
{
"created": "Tue, 30 Jan 2024 14:01:05 GMT",
"version": "v1"
},
{
"created": "Thu, 2 May 2024 12:31:34 GMT",
"version": "v2"
}
] | 2024-05-03 | [
[
"Ashok",
"A.",
""
],
[
"Covas",
"P. B.",
""
],
[
"Prix",
"R.",
""
],
[
"Papa",
"M. A.",
""
]
] | We present a new method and implementation to obtain Bayesian posteriors on the amplitude parameters $\{h_0, \cos \iota, \psi, \phi_0\}$ of continuous-gravitational waves emitted by known pulsars. This approach leverages the well-established $\mathcal{F}$-statistic framework and software. We further explore the benefit... |
1702.07174 | Krishnakanta Bhattacharya | Krishnakanta Bhattacharya, Bibhas Ranjan Majhi | Thermogeometric description of the van der Waals like phase transition
in AdS black holes | Minor modifications, to appear in Phys. Rev. D | Phys. Rev. D 95, 104024 (2017) | 10.1103/PhysRevD.95.104024 | null | gr-qc cond-mat.stat-mech hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that interpreting the cosmological constant as the pressure,
the AdS black holes behave as the van der Waals thermodynamic system. In this
case, like a phase transition from vapor to liquid in a usual van der Waals
system, black holes also changes phases about a critical point in the $P$-$V$
picture,... | [
{
"created": "Thu, 23 Feb 2017 11:01:54 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Apr 2017 09:36:28 GMT",
"version": "v2"
}
] | 2017-05-24 | [
[
"Bhattacharya",
"Krishnakanta",
""
],
[
"Majhi",
"Bibhas Ranjan",
""
]
] | It is well known that interpreting the cosmological constant as the pressure, the AdS black holes behave as the van der Waals thermodynamic system. In this case, like a phase transition from vapor to liquid in a usual van der Waals system, black holes also changes phases about a critical point in the $P$-$V$ picture, w... |
1903.04071 | Cosimo Bambi | Ashutosh Tripathi, Askar B. Abdikamalov, Dimitry Ayzenberg, Cosimo
Bambi, Sourabh Nampalliwar | Constraining the Johannsen deformation parameter $\epsilon_3$ with black
hole X-ray data | 10 pages, 7 figures. v2: refereed version | Phys. Rev. D 99, 083001 (2019) | 10.1103/PhysRevD.99.083001 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend our previous work on tests of the Kerr black hole hypothesis using
X-ray reflection spectroscopy and we infer observational constraints on the
Johannsen deformation parameter $\epsilon_3$. We analyze a NuSTAR observation
of the stellar-mass black hole in GS 1354-645, Suzaku data of the supermassive
black ho... | [
{
"created": "Sun, 10 Mar 2019 22:36:52 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Apr 2019 21:36:36 GMT",
"version": "v2"
}
] | 2019-04-04 | [
[
"Tripathi",
"Ashutosh",
""
],
[
"Abdikamalov",
"Askar B.",
""
],
[
"Ayzenberg",
"Dimitry",
""
],
[
"Bambi",
"Cosimo",
""
],
[
"Nampalliwar",
"Sourabh",
""
]
] | We extend our previous work on tests of the Kerr black hole hypothesis using X-ray reflection spectroscopy and we infer observational constraints on the Johannsen deformation parameter $\epsilon_3$. We analyze a NuSTAR observation of the stellar-mass black hole in GS 1354-645, Suzaku data of the supermassive black hole... |
1612.03753 | Heling Deng | Heling Deng, Jaume Garriga and Alexander Vilenkin | Primordial black hole and wormhole formation by domain walls | null | null | 10.1088/1475-7516/2017/04/050 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In theories with a broken discrete symmetry, Hubble sized spherical domain
walls may spontaneously nucleate during inflation. These objects are
subsequently stretched by the inflationary expansion, resulting in a broad
distribution of sizes. The fate of the walls after inflation depends on their
radius. Walls smaller... | [
{
"created": "Mon, 12 Dec 2016 21:34:51 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Dec 2016 21:44:54 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Dec 2016 21:50:10 GMT",
"version": "v3"
},
{
"created": "Tue, 21 Mar 2017 19:56:30 GMT",
"version": "v4"
}
] | 2017-05-10 | [
[
"Deng",
"Heling",
""
],
[
"Garriga",
"Jaume",
""
],
[
"Vilenkin",
"Alexander",
""
]
] | In theories with a broken discrete symmetry, Hubble sized spherical domain walls may spontaneously nucleate during inflation. These objects are subsequently stretched by the inflationary expansion, resulting in a broad distribution of sizes. The fate of the walls after inflation depends on their radius. Walls smaller t... |
0801.2564 | Jorge Pullin | Rodolfo Gambini and Jorge Pullin | Modern space-time and undecidability | 8 pages, no figures, Revtex, contribution to the volume "Minkowski
spacetime: a hundred years later", edited by Vesselin Petkov | Fundamental theories of physics 165, 149 (2010) | null | LSU-REL-011508 | gr-qc hep-th quant-ph | null | The picture of space-time that Minkowski created in 1907 has been followed by
two important developments in physics not contained in the original picture:
general relativity and quantum mechanics. We will argue that the use of
concepts of those theories to construct space-time implies conceptual
modifications in quan... | [
{
"created": "Wed, 16 Jan 2008 20:17:33 GMT",
"version": "v1"
}
] | 2013-02-22 | [
[
"Gambini",
"Rodolfo",
""
],
[
"Pullin",
"Jorge",
""
]
] | The picture of space-time that Minkowski created in 1907 has been followed by two important developments in physics not contained in the original picture: general relativity and quantum mechanics. We will argue that the use of concepts of those theories to construct space-time implies conceptual modifications in quantu... |
gr-qc/0611091 | Anwar Shiekh Dr. | Arif Akhundov, Anwar Shiekh | A Review of Leading Quantum Gravitational Corrections to Newtonian
Gravity | 21 pages, 18 figures (references added) | Electron.J.Theor.Phys.17:1,2008 | null | null | gr-qc | null | In this review we present the theoretical background for treating General
Relativity as an effective field theory and focus on the concrete results of
such a treatment. As a result we present the calculations of the low-energy
leading gravitational corrections to the Newtonian potential between two
sources.
| [
{
"created": "Fri, 17 Nov 2006 20:34:31 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Dec 2006 21:15:11 GMT",
"version": "v2"
}
] | 2010-12-24 | [
[
"Akhundov",
"Arif",
""
],
[
"Shiekh",
"Anwar",
""
]
] | In this review we present the theoretical background for treating General Relativity as an effective field theory and focus on the concrete results of such a treatment. As a result we present the calculations of the low-energy leading gravitational corrections to the Newtonian potential between two sources. |
1011.5252 | Thiago Gilberto do Prado | Thiago G. Prado, Marcos C. Verges | A Extended Cosmological Cardy-Verlinde Formula | null | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | E. Verlinde obtained a generalized formula for the entropy of a conformal
field theory. For this we consider a (n+1) dimensional closed radiation
dominated FLWR in the context of the holographic principle. In this work we
construct a extension of the Cardy-Verlinde formula to positive cosmological
constant spaces (dS... | [
{
"created": "Tue, 23 Nov 2010 22:39:48 GMT",
"version": "v1"
}
] | 2010-11-25 | [
[
"Prado",
"Thiago G.",
""
],
[
"Verges",
"Marcos C.",
""
]
] | E. Verlinde obtained a generalized formula for the entropy of a conformal field theory. For this we consider a (n+1) dimensional closed radiation dominated FLWR in the context of the holographic principle. In this work we construct a extension of the Cardy-Verlinde formula to positive cosmological constant spaces (dS s... |
2306.07326 | Hideki Maeda | Hideki Maeda | Energy conditions for non-timelike thin shells | 35 pages, 4 figures, 2 tables; v2, title shortened, final version to
appear in Classical and Quantum Gravity | Class.Quant.Grav. 40 (2023) 19, 195009 | 10.1088/1361-6382/acf181 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study energy conditions for non-timelike thin shells in arbitrary $n(\ge
3)$ dimensions. It is shown that the induced energy-momentum tensor
$t_{\mu\nu}$ on a shell $\Sigma$ is of the Hawking-Ellis type I if $\Sigma$ is
spacelike and either of type I, II, or III if $\Sigma$ is null. Then, we derive
simple equivale... | [
{
"created": "Mon, 12 Jun 2023 18:00:02 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Aug 2023 12:59:13 GMT",
"version": "v2"
}
] | 2023-09-06 | [
[
"Maeda",
"Hideki",
""
]
] | We study energy conditions for non-timelike thin shells in arbitrary $n(\ge 3)$ dimensions. It is shown that the induced energy-momentum tensor $t_{\mu\nu}$ on a shell $\Sigma$ is of the Hawking-Ellis type I if $\Sigma$ is spacelike and either of type I, II, or III if $\Sigma$ is null. Then, we derive simple equivalent... |
1304.5963 | H. Gohar | Khush Jan and H. Gohar | Hawking radiation of scalars from charged accelerating and rotating
black holes with NUT parameter | some changes and corrections, new references added, 10 pages | Astrophysics and Space sciences, Volume 350 , pp 279-284 (2014) | 10.1007/s10509-013-1704-y | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the quantum tunneling of scalars from charged accelerating and
rotating black hole with NUT parameter. For this purpose we use the charged
Klein-Gordon equation. We apply WKB approximation and the Hamilton-Jacobi
method to solve charged the Klein-Gordon equation. We find the tunneling
probability of outgoing... | [
{
"created": "Mon, 22 Apr 2013 14:32:50 GMT",
"version": "v1"
},
{
"created": "Thu, 16 May 2013 08:16:25 GMT",
"version": "v2"
},
{
"created": "Wed, 16 Oct 2013 10:32:15 GMT",
"version": "v3"
}
] | 2015-03-19 | [
[
"Jan",
"Khush",
""
],
[
"Gohar",
"H.",
""
]
] | We study the quantum tunneling of scalars from charged accelerating and rotating black hole with NUT parameter. For this purpose we use the charged Klein-Gordon equation. We apply WKB approximation and the Hamilton-Jacobi method to solve charged the Klein-Gordon equation. We find the tunneling probability of outgoing c... |
gr-qc/0701117 | Stefano Ansoldi | Stefano Ansoldi | Bubbles and Quantum Tunnelling in Inflationary Cosmology | LaTeX, 4 pages, 9 (small) figures. To appear in the Proceedings of
the the 16th Workshop on General Relativity and Gravitation, 27th November
(Mon) - 1st December (Fri) 2006, Niigata, Japan | null | null | null | gr-qc | null | We review a procedure to use semiclassical methods in the quantization of
General Relativistic shells and apply these techniques in some simplified
models of inflationary cosmology. Some interesting open issues are introduced
and the relevance of their solution in the broader context of Quantum Gravity
is discussed.
| [
{
"created": "Mon, 22 Jan 2007 01:45:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ansoldi",
"Stefano",
""
]
] | We review a procedure to use semiclassical methods in the quantization of General Relativistic shells and apply these techniques in some simplified models of inflationary cosmology. Some interesting open issues are introduced and the relevance of their solution in the broader context of Quantum Gravity is discussed. |
gr-qc/0306046 | Justin Malecki | J.J. Malecki and R.B. Mann | 3-Body Dynamics in a (1+1) Dimensional Relativistic Self-Gravitating
System | latex, 26 pages, 17 figures, high quality figures available upon
request; typos and grammar corrected | Phys.Rev. E69 (2004) 066208 | 10.1103/PhysRevE.69.066208 | WATPHYS-TH03/04 | gr-qc astro-ph nlin.CD | null | The results of our study of the motion of a three particle, self-gravitating
system in general relativistic lineal gravity is presented for an arbitrary
ratio of the particle masses. We derive a canonical expression for the
Hamiltonian of the system and discuss the numerical solution of the resulting
equations of mot... | [
{
"created": "Wed, 11 Jun 2003 13:42:32 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Jul 2004 16:09:13 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Malecki",
"J. J.",
""
],
[
"Mann",
"R. B.",
""
]
] | The results of our study of the motion of a three particle, self-gravitating system in general relativistic lineal gravity is presented for an arbitrary ratio of the particle masses. We derive a canonical expression for the Hamiltonian of the system and discuss the numerical solution of the resulting equations of motio... |
1306.4866 | Yury F. Pirogov | Yu. F. Pirogov | Towards the rotating scalar-vacuum black holes | 3 pages, minor extension | null | null | null | gr-qc hep-ph math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The problem of merging in black holes the rotation and a massless scalar
field is treated. It is argued in the comment that the Kerr-like and
Demianski-like metrics in General Relativity with a free massless scalar field
or in the free Brans-Dicke theory, claimed so far in the literature as an
application of the Newm... | [
{
"created": "Thu, 20 Jun 2013 13:22:14 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jun 2013 16:39:14 GMT",
"version": "v2"
}
] | 2013-06-26 | [
[
"Pirogov",
"Yu. F.",
""
]
] | The problem of merging in black holes the rotation and a massless scalar field is treated. It is argued in the comment that the Kerr-like and Demianski-like metrics in General Relativity with a free massless scalar field or in the free Brans-Dicke theory, claimed so far in the literature as an application of the Newman... |
gr-qc/0506080 | Michel Leclerc | M. Leclerc | Second order formalism in Poincare gauge theory | final version, to appear in IJMPD | Int.J.Mod.Phys.D16:655-680,2007 | 10.1142/S0218271807009413 | null | gr-qc | null | Changing the set of independent variables of Poincare gauge theory and
considering, in a manner similar to the second order formalism of general
relativity, the Riemannian part of the Lorentz connection as function of the
tetrad field, we construct theories that do not contain second or higher order
derivatives in th... | [
{
"created": "Tue, 14 Jun 2005 06:14:13 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Sep 2006 11:27:59 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Leclerc",
"M.",
""
]
] | Changing the set of independent variables of Poincare gauge theory and considering, in a manner similar to the second order formalism of general relativity, the Riemannian part of the Lorentz connection as function of the tetrad field, we construct theories that do not contain second or higher order derivatives in the ... |
gr-qc/9703017 | Jose-Luis Rosales | Jose-Luis Rosales | Vacuum decay via Lorentzian wormholes | null | Int.J.Mod.Phys. A13 (1998) 1191-1200 | 10.1142/S0217751X98000548 | FR-THEP-NR 97/7 | gr-qc | null | We speculate about the spacetime description due to the presence of
Lorentzian wormholes (handles in spacetime joining two distant regions or other
universes) in quantum gravity. The semiclassical rate of production of these
Lorentzian wormholes in Reissner-Nordstr\"om spacetimes is calculated as a
result of the spon... | [
{
"created": "Thu, 6 Mar 1997 19:27:26 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Mar 1997 16:20:01 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Rosales",
"Jose-Luis",
""
]
] | We speculate about the spacetime description due to the presence of Lorentzian wormholes (handles in spacetime joining two distant regions or other universes) in quantum gravity. The semiclassical rate of production of these Lorentzian wormholes in Reissner-Nordstr\"om spacetimes is calculated as a result of the sponta... |
gr-qc/0511017 | Badri Krishnan | Erik Schnetter and Badri Krishnan | Non-symmetric trapped surfaces in the Schwarzschild and Vaidya
spacetimes | 4 pages, 3 figures; v2: minor modifications; v3: clarified
conclusions | Phys.Rev. D73 (2006) 021502(R) | 10.1103/PhysRevD.73.021502 | AEI-2005-161 | gr-qc | null | Marginally trapped surfaces (MTSs) are commonly used in numerical relativity
to locate black holes. For dynamical black holes, it is not known generally if
this procedure is sufficiently reliable. Even for Schwarzschild black holes,
Wald and Iyer constructed foliations which come arbitrarily close to the
singularity ... | [
{
"created": "Thu, 3 Nov 2005 16:49:24 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Nov 2005 17:26:42 GMT",
"version": "v2"
},
{
"created": "Fri, 20 Jan 2006 00:05:37 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Schnetter",
"Erik",
""
],
[
"Krishnan",
"Badri",
""
]
] | Marginally trapped surfaces (MTSs) are commonly used in numerical relativity to locate black holes. For dynamical black holes, it is not known generally if this procedure is sufficiently reliable. Even for Schwarzschild black holes, Wald and Iyer constructed foliations which come arbitrarily close to the singularity bu... |
gr-qc/9812048 | Philippe Droz-Vincent | Ph. Droz-Vincent (Univ. P. et M. Curie, Paris) | Isometric invariance of the positive-frequency kernel in generalized
FRW-like spacetimes | Latex file, 7 pages, Contribution to ERES98 held at Salamanca, Spain | null | null | GCR-98/12/02 | gr-qc hep-th | null | Klein-Gordon equation with minimal coupling in FRW-like spacetimes with
compact but not necessarily isotropic neither homogeneous space sections.
Beside exceptional cases, the kernel is invariant under continuous isometries.
| [
{
"created": "Mon, 14 Dec 1998 18:26:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Droz-Vincent",
"Ph.",
"",
"Univ. P. et M. Curie, Paris"
]
] | Klein-Gordon equation with minimal coupling in FRW-like spacetimes with compact but not necessarily isotropic neither homogeneous space sections. Beside exceptional cases, the kernel is invariant under continuous isometries. |
gr-qc/0110083 | Andrew DeBenedictis | A. Das, A. DeBenedictis | Spherical Gravitating Systems of Arbitrary Dimension | 14 pages with one fugure. Uses AMS fonts and Prog. Theor. Phys. style
files. Added section on neutron star and anisotropic fluid star as well as
Comments on Buchdahl's theorem and more analysis regarding the Birkhoff's
theorem. Accepted for publication in Prog. Theor. Phys | Prog.Theor.Phys.108:119-132,2002 | 10.1143/PTP.108.119 | null | gr-qc hep-th | null | We study spherically symmetric solutions to the Einstein field equations
under the assumption that the space-time may possess an arbitrary number of
spatial dimensions. The general solution of Synge is extended to describe
systems of any dimension. Arbitrary dimension analogues of known four
dimensional solutions are... | [
{
"created": "Thu, 18 Oct 2001 19:45:35 GMT",
"version": "v1"
},
{
"created": "Fri, 31 May 2002 18:35:52 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Das",
"A.",
""
],
[
"DeBenedictis",
"A.",
""
]
] | We study spherically symmetric solutions to the Einstein field equations under the assumption that the space-time may possess an arbitrary number of spatial dimensions. The general solution of Synge is extended to describe systems of any dimension. Arbitrary dimension analogues of known four dimensional solutions are a... |
gr-qc/0605030 | James Van Meter | James R. van Meter, John G. Baker, Michael Koppitz, Dae-Il Choi | How to move a black hole without excision: gauge conditions for the
numerical evolution of a moving puncture | 8 pages, 13 figures. Edited slightly for clarity as requested by the
referee and editor. Also corrected errors due to a misplaced factor of alpha.
Main results unchanged | Phys.Rev.D73:124011,2006 | 10.1103/PhysRevD.73.124011 | null | gr-qc | null | Recent demonstrations of unexcised black holes traversing across
computational grids represent a significant advance in numerical relativity.
Stable and accurate simulations of multiple orbits, and their radiated waves,
result. This capability is critically undergirded by a careful choice of gauge.
Here we present an... | [
{
"created": "Fri, 5 May 2006 07:16:10 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Jun 2006 21:58:06 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"van Meter",
"James R.",
""
],
[
"Baker",
"John G.",
""
],
[
"Koppitz",
"Michael",
""
],
[
"Choi",
"Dae-Il",
""
]
] | Recent demonstrations of unexcised black holes traversing across computational grids represent a significant advance in numerical relativity. Stable and accurate simulations of multiple orbits, and their radiated waves, result. This capability is critically undergirded by a careful choice of gauge. Here we present anal... |
1205.1636 | Giovanni Amelino-Camelia | Giovanni Amelino-Camelia | Born's prophecy leaves no space for quantum gravity | 15 pages, 4 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I stress that spacetime is a redundant abstraction, since describing the
physical content of all so-called "space-time measurements" only requires
timing (by a physical/material clock) of particle detections (at a
physical/material detector). It is interesting then to establish which aspects
of our current theories a... | [
{
"created": "Tue, 8 May 2012 09:12:17 GMT",
"version": "v1"
}
] | 2012-05-09 | [
[
"Amelino-Camelia",
"Giovanni",
""
]
] | I stress that spacetime is a redundant abstraction, since describing the physical content of all so-called "space-time measurements" only requires timing (by a physical/material clock) of particle detections (at a physical/material detector). It is interesting then to establish which aspects of our current theories aff... |
1305.3372 | Archil Kobakhidze | Parth Girdhar and Archil Kobakhidze | Cosmological Zitterbewegung | 5 pages. This essay received an Honorable Mention in the Gravity
Research Foundation essay contest 2013 | null | 10.1142/S0218271813420236 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a new phenomenon of zitterbewegung of a free Dirac particle in
cosmological spacetimes. Unlike the similar effect theorized by Schrodinger in
1930, the cosmological zitterbewegung is a real, physically attainable effect,
which originates from the mixing of positive and negative frequency modes of a
field ... | [
{
"created": "Wed, 15 May 2013 07:07:13 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Girdhar",
"Parth",
""
],
[
"Kobakhidze",
"Archil",
""
]
] | We describe a new phenomenon of zitterbewegung of a free Dirac particle in cosmological spacetimes. Unlike the similar effect theorized by Schrodinger in 1930, the cosmological zitterbewegung is a real, physically attainable effect, which originates from the mixing of positive and negative frequency modes of a field op... |
1706.03527 | Clemens Heuson | Clemens Heuson | Commuting and Noncommuting Coordinates in Deformed Special Relativity | 8 pages, no figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Commuting and noncommuting space-time coordinates in a class of deformed
special relativity theories are investigated. Their momentum space
representation, transformation behaviour, space-time algebra, invariants and
the corresponding field theories are derived. Several coordinates require as a
novel feature the intr... | [
{
"created": "Mon, 12 Jun 2017 09:17:55 GMT",
"version": "v1"
}
] | 2017-06-13 | [
[
"Heuson",
"Clemens",
""
]
] | Commuting and noncommuting space-time coordinates in a class of deformed special relativity theories are investigated. Their momentum space representation, transformation behaviour, space-time algebra, invariants and the corresponding field theories are derived. Several coordinates require as a novel feature the introd... |
2401.05464 | Xinyue Jiang | Xinyue Jiang, Xin Ren, Zhao Li, Yi-Fu Cai, Xinzhong Er | Exploring $f(T)$ Gravity via strongly lensed fast radio bursts | null | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This study aims to investigate the strong gravitational lensing effects in
$f(T)$ gravity. We present the theoretical analytic expressions for the lensing
effects in $f(T)$ gravity, including deflection angle, magnification, and time
delay. On this basis, we also take the plasma lensing effect into
consideration. We ... | [
{
"created": "Wed, 10 Jan 2024 13:09:17 GMT",
"version": "v1"
}
] | 2024-01-12 | [
[
"Jiang",
"Xinyue",
""
],
[
"Ren",
"Xin",
""
],
[
"Li",
"Zhao",
""
],
[
"Cai",
"Yi-Fu",
""
],
[
"Er",
"Xinzhong",
""
]
] | This study aims to investigate the strong gravitational lensing effects in $f(T)$ gravity. We present the theoretical analytic expressions for the lensing effects in $f(T)$ gravity, including deflection angle, magnification, and time delay. On this basis, we also take the plasma lensing effect into consideration. We co... |
gr-qc/9407008 | null | J. David Brown | On Variational Principles for Gravitating Perfect Fluids | (29 pages, REVTEX) (\end{document} statement has been added. That's
all.) | null | null | null | gr-qc | null | The connection is established between two different action principles for
perfect fluids in the context of general relativity. For one of these actions,
$S$, the fluid four--velocity is expressed as a sum of products of scalar
fields and their gradients (the velocity--potential representation). For the
other action, ... | [
{
"created": "Mon, 11 Jul 1994 17:23:00 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Jul 1994 16:48:30 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Brown",
"J. David",
""
]
] | The connection is established between two different action principles for perfect fluids in the context of general relativity. For one of these actions, $S$, the fluid four--velocity is expressed as a sum of products of scalar fields and their gradients (the velocity--potential representation). For the other action, ${... |
1702.05481 | Christopher Berry | C. P. L. Berry, R. H. Cole, P. Ca\~nizares and J. R. Gair | Understanding the importance of transient resonances in extreme mass
ratio inspirals | 2 pages, 0 figures; to appear in the proceedings of the 11th
International LISA Symposium | Journal of Physics: Conference Series; 840(1): 012052(2), 2017 | 10.1088/1742-6596/840/1/012052 | LIGO-P1600349 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Extreme mass ratio inspirals (EMRIs) occur when a compact object orbits a
much larger one, like a solar-mass black hole around a supermassive black hole.
The orbit has 3 frequencies which evolve through the inspiral. If the orbital
radial frequency and polar frequency become commensurate, the system passes
through a ... | [
{
"created": "Fri, 17 Feb 2017 17:27:51 GMT",
"version": "v1"
}
] | 2017-06-16 | [
[
"Berry",
"C. P. L.",
""
],
[
"Cole",
"R. H.",
""
],
[
"Cañizares",
"P.",
""
],
[
"Gair",
"J. R.",
""
]
] | Extreme mass ratio inspirals (EMRIs) occur when a compact object orbits a much larger one, like a solar-mass black hole around a supermassive black hole. The orbit has 3 frequencies which evolve through the inspiral. If the orbital radial frequency and polar frequency become commensurate, the system passes through a tr... |
gr-qc/0310083 | Jerry B. Griffiths | J. B. Griffiths, P. Docherty and J. Podolsky | Generalised Kundt waves and their physical interpretation | 16 pages including 2 figures. To appear in Classical and Quantum Grav | Class.Quant.Grav. 21 (2004) 207-222 | 10.1088/0264-9381/21/1/014 | null | gr-qc | null | We present the complete family of space-times with a non-expanding,
shear-free, twist-free, geodesic principal null congruence (Kundt waves) that
are of algebraic type III and for which the cosmological constant ($\Lambda_c$)
is non-zero. The possible presence of an aligned pure radiation field is also
assumed. These... | [
{
"created": "Thu, 16 Oct 2003 14:09:05 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Griffiths",
"J. B.",
""
],
[
"Docherty",
"P.",
""
],
[
"Podolsky",
"J.",
""
]
] | We present the complete family of space-times with a non-expanding, shear-free, twist-free, geodesic principal null congruence (Kundt waves) that are of algebraic type III and for which the cosmological constant ($\Lambda_c$) is non-zero. The possible presence of an aligned pure radiation field is also assumed. These s... |
gr-qc/0011106 | Marcus Gaul | Marcus Gaul and Carlo Rovelli | A generalized Hamiltonian Constraint Operator in Loop Quantum Gravity
and its simplest Euclidean Matrix Elements | 35 pp, 20 eps figures; minor corrections, references added; version
to appear in Class. Quant. Grav | Class.Quant.Grav. 18 (2001) 1593-1624 | 10.1088/0264-9381/18/9/301 | MPI-PhT-2000/39, LMU-TPW-00/22 | gr-qc hep-th | null | We study a generalized version of the Hamiltonian constraint operator in
nonperturbative loop quantum gravity. The generalization is based on admitting
arbitrary irreducible SU(2) representations in the regularization of the
operator, in contrast to the original definition where only the fundamental
representation is... | [
{
"created": "Wed, 29 Nov 2000 15:36:58 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Mar 2001 17:49:46 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Gaul",
"Marcus",
""
],
[
"Rovelli",
"Carlo",
""
]
] | We study a generalized version of the Hamiltonian constraint operator in nonperturbative loop quantum gravity. The generalization is based on admitting arbitrary irreducible SU(2) representations in the regularization of the operator, in contrast to the original definition where only the fundamental representation is t... |
2404.04573 | Bayram Tekin | Kerim Demirel, Bayram Tekin | Anomaly Induced Inflation in the Minimal Quartic Extension of Einstein's
Gravity | 19 pages, 3 figures | null | null | null | gr-qc astro-ph.CO hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A particular extension of Einstein's General Relativity up to and including
quartic terms in the curvature tensor is minimal in the sense that it has a
unique maximally symmetric vacuum and only a massless spin-2 excitation in its
spectrum around the vacuum. We study the inflation phase of the universe in the
minimal... | [
{
"created": "Sat, 6 Apr 2024 09:46:06 GMT",
"version": "v1"
}
] | 2024-04-09 | [
[
"Demirel",
"Kerim",
""
],
[
"Tekin",
"Bayram",
""
]
] | A particular extension of Einstein's General Relativity up to and including quartic terms in the curvature tensor is minimal in the sense that it has a unique maximally symmetric vacuum and only a massless spin-2 excitation in its spectrum around the vacuum. We study the inflation phase of the universe in the minimal q... |
gr-qc/0511063 | Oleg Zaslavskii | O.B.Zaslavskii | Ultimate gravitational mass defect | 9 pages. 1 reference added. To appear in Gen. Rel. Grav | Gen.Rel.Grav.38:945-951,2006 | 10.1007/s10714-006-0274-5 | null | gr-qc astro-ph hep-th | null | We present a new type of gravitational mass defect in which an infinite
amount of matter may be bounded in a zero ADM mass. This interpolates between
effects typical of closed worlds and T-spheres. We consider the Tolman model of
dust distribution and show that this phenomenon reveals itself for a solution
that has n... | [
{
"created": "Sat, 12 Nov 2005 10:42:04 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Dec 2005 09:18:23 GMT",
"version": "v2"
}
] | 2010-05-12 | [
[
"Zaslavskii",
"O. B.",
""
]
] | We present a new type of gravitational mass defect in which an infinite amount of matter may be bounded in a zero ADM mass. This interpolates between effects typical of closed worlds and T-spheres. We consider the Tolman model of dust distribution and show that this phenomenon reveals itself for a solution that has no ... |
1112.2687 | Jacek Tafel | J. Tafel | Static spherically symmetric black holes with scalar field | 18 pages, 1 figure | Gen. Rel. Grav. 46 (2014) 1645 | 10.1007/s10714-013-1645-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Static spherically symmetric black holes and particle like solutions with
self interacting minimally coupled scalar field {\phi} are analyzed. They are
asymptotically flat or anti-de Sitter (AdS). We express them in terms of a
single function {\rho} which undergoes simple conditions. If {\phi} is
nontrivial the ADM m... | [
{
"created": "Mon, 12 Dec 2011 20:33:43 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Jan 2013 15:27:58 GMT",
"version": "v2"
},
{
"created": "Thu, 4 Apr 2013 17:13:40 GMT",
"version": "v3"
},
{
"created": "Sun, 16 Jun 2013 15:35:38 GMT",
"version": "v4"
}
] | 2016-02-12 | [
[
"Tafel",
"J.",
""
]
] | Static spherically symmetric black holes and particle like solutions with self interacting minimally coupled scalar field {\phi} are analyzed. They are asymptotically flat or anti-de Sitter (AdS). We express them in terms of a single function {\rho} which undergoes simple conditions. If {\phi} is nontrivial the ADM mas... |
0812.3554 | Yongge Ma | Jinsong Yang and Yongge Ma | Quasi-Local Energy in Loop Quantum Gravity | 29 pages; latest version in PRD | Phys.Rev.D80:084027,2009 | 10.1103/PhysRevD.80.084027 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Although there is no known meaningful notion of the energy density of the
gravitational field in general relativity, a few notions of quasi-local energy
of gravity associated to extended but finite domains have been proposed. In
this paper, the notions of quasi-local energy are studied in the framework of
loop quantu... | [
{
"created": "Thu, 18 Dec 2008 15:29:13 GMT",
"version": "v1"
},
{
"created": "Sun, 4 Jan 2009 12:18:14 GMT",
"version": "v2"
},
{
"created": "Sun, 1 Nov 2009 03:35:58 GMT",
"version": "v3"
}
] | 2010-04-15 | [
[
"Yang",
"Jinsong",
""
],
[
"Ma",
"Yongge",
""
]
] | Although there is no known meaningful notion of the energy density of the gravitational field in general relativity, a few notions of quasi-local energy of gravity associated to extended but finite domains have been proposed. In this paper, the notions of quasi-local energy are studied in the framework of loop quantum ... |
gr-qc/9401021 | Henri Waelbroeck | H. Waelbroeck and F. Zertuche | Homotopy Invariants and Time Evolution in (2+1)-Dimensional Gravity | 34 pages, Mexico preprint ICN-UNAM-93-11 | Phys.Rev. D50 (1994) 4966-4981 | 10.1103/PhysRevD.50.4966 | null | gr-qc | null | We establish the relation between the ISO(2,1) homotopy invariants and the
polygon representation of (2+1)-dimensional gravity. The polygon closure
conditions, together with the SO(2,1) cycle conditions, are equivalent to the
ISO(2,1) cycle conditions for the representa- tions of the fundamental group in
ISO(2,1). Al... | [
{
"created": "Thu, 20 Jan 1994 02:09:37 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Waelbroeck",
"H.",
""
],
[
"Zertuche",
"F.",
""
]
] | We establish the relation between the ISO(2,1) homotopy invariants and the polygon representation of (2+1)-dimensional gravity. The polygon closure conditions, together with the SO(2,1) cycle conditions, are equivalent to the ISO(2,1) cycle conditions for the representa- tions of the fundamental group in ISO(2,1). Also... |
1507.02462 | Supakchai Ponglertsakul | Supakchai Ponglertsakul, Sam Dolan and Elizabeth Winstanley | Black hole solutions in Einstein-charged scalar field theory | 4 pages, 3 figures, talk at MG14 Rome July 2015 | Phys. Rev. D 92, 124047 (2015) | 10.1103/PhysRevD.92.124047 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate possible end-points of the superradiant instability for a
charged black hole with a reflecting mirror. By considering a fully coupled
system of gravity and a charged scalar field, hairy black hole solutions are
obtained. The linear stability of these black hole solutions is studied.
| [
{
"created": "Thu, 9 Jul 2015 11:23:08 GMT",
"version": "v1"
}
] | 2016-01-13 | [
[
"Ponglertsakul",
"Supakchai",
""
],
[
"Dolan",
"Sam",
""
],
[
"Winstanley",
"Elizabeth",
""
]
] | We investigate possible end-points of the superradiant instability for a charged black hole with a reflecting mirror. By considering a fully coupled system of gravity and a charged scalar field, hairy black hole solutions are obtained. The linear stability of these black hole solutions is studied. |
gr-qc/9803048 | Mariusz Dabrowski | John D. Barrow and Mariusz P. Dabrowski | Godel Universes in String Theory | 13 pages, REVTEX, improved version, more references added | Phys.Rev.D58:103502,1998 | 10.1103/PhysRevD.58.103502 | null | gr-qc astro-ph hep-th | null | We show that homogeneous G\"odel spacetimes need not contain closed timelike
curves in low-energy-effective string theories. We find exact solutions for the
G\"odel metric in string theory for the full $O(\alpha ^{\prime})$ action
including both dilaton and axion fields. The results are valid for bosonic,
heterotic a... | [
{
"created": "Fri, 13 Mar 1998 12:48:16 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Apr 1998 10:23:08 GMT",
"version": "v2"
}
] | 2010-11-19 | [
[
"Barrow",
"John D.",
""
],
[
"Dabrowski",
"Mariusz P.",
""
]
] | We show that homogeneous G\"odel spacetimes need not contain closed timelike curves in low-energy-effective string theories. We find exact solutions for the G\"odel metric in string theory for the full $O(\alpha ^{\prime})$ action including both dilaton and axion fields. The results are valid for bosonic, heterotic and... |
1809.05729 | Karan Fernandes | Karan Fernandes and Amitabha Lahiri | Hamiltonian BRST formalism for gauge fields on black hole spacetimes | 28 pp | Phys. Rev. D 99, 085004 (2019) | 10.1103/PhysRevD.99.085004 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the Becchi-Rouet-Stora-Tyutin (BRST) formalism for gauge
theories on spherically symmetric black hole spacetimes, with or without a
cosmological constant ($\Lambda\geq0$). This is illustrated through the example
of scalar electrodynamics. We first demonstrate that the horizons contribute
additional sur... | [
{
"created": "Sat, 15 Sep 2018 15:29:49 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Jan 2019 05:55:30 GMT",
"version": "v2"
}
] | 2019-04-17 | [
[
"Fernandes",
"Karan",
""
],
[
"Lahiri",
"Amitabha",
""
]
] | We investigate the Becchi-Rouet-Stora-Tyutin (BRST) formalism for gauge theories on spherically symmetric black hole spacetimes, with or without a cosmological constant ($\Lambda\geq0$). This is illustrated through the example of scalar electrodynamics. We first demonstrate that the horizons contribute additional surfa... |
2405.05077 | Vitalii Vertogradov | Vitalii Vertogradov, Ali \"Ovg\"un, Reggie C. Pantig | Analyzing the Influence of Geometrical Deformation on Photon Sphere and
Shadow Radius: A New Analytical Approach -Stationary, and Axisymmetric
Spacetime | 9 pages, 10 figures. arXiv admin note: text overlap with
arXiv:2404.04046 | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Black hole shadows and photon spheres offer valuable tools for investigating
black hole properties. Recent observations by the Event Horizon Telescope
Collaboration have confirmed the existence of rotating black holes. Black hole
parameters influence the observed shadow size. This paper explores the impact
of geometr... | [
{
"created": "Wed, 8 May 2024 14:21:46 GMT",
"version": "v1"
}
] | 2024-05-09 | [
[
"Vertogradov",
"Vitalii",
""
],
[
"Övgün",
"Ali",
""
],
[
"Pantig",
"Reggie C.",
""
]
] | Black hole shadows and photon spheres offer valuable tools for investigating black hole properties. Recent observations by the Event Horizon Telescope Collaboration have confirmed the existence of rotating black holes. Black hole parameters influence the observed shadow size. This paper explores the impact of geometric... |
1911.13222 | Francisco Mart\'inez L\'opez | Francisco Mart\'inez L\'opez | The information loss paradox | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this thesis, we have studied the information loss paradox in detail. As a
first step, we have derived the main results of quantum field theory in a
curved background. We have discussed the case of the free scalar Klein-Gordon
field and concluded with a derivation of the so-called Unruh effect in
Minkowski spacetim... | [
{
"created": "Mon, 25 Nov 2019 21:46:22 GMT",
"version": "v1"
}
] | 2019-12-02 | [
[
"López",
"Francisco Martínez",
""
]
] | In this thesis, we have studied the information loss paradox in detail. As a first step, we have derived the main results of quantum field theory in a curved background. We have discussed the case of the free scalar Klein-Gordon field and concluded with a derivation of the so-called Unruh effect in Minkowski spacetime.... |
1201.1469 | Carlos Augusto Romero Filho | C. Romero, J. B. Fonseca-Neto and M. L. Pucheu | General Relativity and Weyl Geometry | LATEX, 22 pages | null | 10.1088/0264-9381/29/15/155015 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the general theory of relativity can be formulated in the
language of Weyl geometry. We develop the concept of Weyl frames and point out
that the new mathematical formalism may lead to different pictures of the same
gravitational phenomena. We show that in an arbitrary Weyl frame general
relativity, whic... | [
{
"created": "Fri, 6 Jan 2012 18:32:54 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Romero",
"C.",
""
],
[
"Fonseca-Neto",
"J. B.",
""
],
[
"Pucheu",
"M. L.",
""
]
] | We show that the general theory of relativity can be formulated in the language of Weyl geometry. We develop the concept of Weyl frames and point out that the new mathematical formalism may lead to different pictures of the same gravitational phenomena. We show that in an arbitrary Weyl frame general relativity, which ... |
1905.06988 | Petar Simidzija | Petar Simidzija, Achim Kempf, Eduardo Martin-Martinez | Gravitational wave emission from the CMB and other thermal fields | 11 pages, 1 figure; RevTeX 4.1. v2: Minor changes to match published
version (including title change) | Phys. Lett. B 816, 136208 (2021) | 10.1016/j.physletb.2021.136208 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the gravitational wave power density emitted by quantum thermal
sources. As particular cases, we calculate the emission of gravitational waves
from the cosmic microwave background and from stellar sources. We study how
treating gravity classically affects the prediction of the thermal emission. We
find t... | [
{
"created": "Thu, 16 May 2019 18:40:31 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Apr 2021 00:32:08 GMT",
"version": "v2"
}
] | 2021-04-20 | [
[
"Simidzija",
"Petar",
""
],
[
"Kempf",
"Achim",
""
],
[
"Martin-Martinez",
"Eduardo",
""
]
] | We calculate the gravitational wave power density emitted by quantum thermal sources. As particular cases, we calculate the emission of gravitational waves from the cosmic microwave background and from stellar sources. We study how treating gravity classically affects the prediction of the thermal emission. We find tha... |
gr-qc/0307046 | Niall \'O Murchadha | Edward Malec, Niall \'O Murchadha | Constant mean curvature slices in the extended Schwarzschild solution
and collapse of the lapse: Part I | null | Phys.Rev. D68 (2003) 124019 | 10.1103/PhysRevD.68.124019 | null | gr-qc | null | We give a detailed description of the constant mean curvature foliations in
the Schwarzschild solution; show that the lapse collapses exponentially, and
compute the exponent.
| [
{
"created": "Thu, 10 Jul 2003 09:15:01 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Malec",
"Edward",
""
],
[
"Murchadha",
"Niall Ó",
""
]
] | We give a detailed description of the constant mean curvature foliations in the Schwarzschild solution; show that the lapse collapses exponentially, and compute the exponent. |
1502.03344 | Pedro Moraes | P.H.R.S. Moraes | Cosmic Acceleration from Varying Masses in Five Dimensions | 12 pages, 1 figure. To appear in International Journal of Modern
Physics D | null | 10.1142/S0218271816500097 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Much effort has been made in trying to solve or at least evade the
inconsistencies that emerge from general relativity as the framework for a
cosmological model. The extradi- mensional models rise as superb possibilities
on this regard. In this work I present cosmo- logical solutions for Wesson's
Space-Time-Matter th... | [
{
"created": "Tue, 10 Feb 2015 09:48:05 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Apr 2015 19:07:06 GMT",
"version": "v2"
},
{
"created": "Tue, 8 Sep 2015 11:03:58 GMT",
"version": "v3"
}
] | 2016-02-17 | [
[
"Moraes",
"P. H. R. S.",
""
]
] | Much effort has been made in trying to solve or at least evade the inconsistencies that emerge from general relativity as the framework for a cosmological model. The extradi- mensional models rise as superb possibilities on this regard. In this work I present cosmo- logical solutions for Wesson's Space-Time-Matter theo... |
2407.04043 | Jordan Fran\c{c}ois | Jordan Fran\c{c}ois, Lucrezia Ravera | Geometric relational framework for general-relativistic gauge field
theories | 81 pages | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We remind how relationality arises as the core insight of
general-relativistic gauge field theories from the articulation of the
generalised hole and point-coincidence arguments. Hence, a compelling case for
a manifestly relational framework ensues naturally. We propose our formulation
for such a framework, based on ... | [
{
"created": "Thu, 4 Jul 2024 16:33:58 GMT",
"version": "v1"
}
] | 2024-07-08 | [
[
"François",
"Jordan",
""
],
[
"Ravera",
"Lucrezia",
""
]
] | We remind how relationality arises as the core insight of general-relativistic gauge field theories from the articulation of the generalised hole and point-coincidence arguments. Hence, a compelling case for a manifestly relational framework ensues naturally. We propose our formulation for such a framework, based on a ... |
gr-qc/0203077 | Sergio M. C. V. Goncalves | Sergio M. C. V. Goncalves (Yale), Sanjay Jhingan (YITP, Japan) | A note on the cylindrical collapse of counter-rotating dust | 8 pages, LaTeX, ijmpd macros (included), 1 eps figure; accepted for
publication in Int. J. Mod. Phys. D | Int.J.Mod.Phys. D11 (2002) 1469-1478 | 10.1142/S0218271802002128 | null | gr-qc | null | We find analytical solutions describing the collapse of an infinitely long
cylindrical shell of counter-rotating dust. We show that--for the classes of
solutions discussed herein--from regular initial data a curvature singularity
inevitably develops, and no apparent horizons form, thus in accord with the
spirit of th... | [
{
"created": "Fri, 22 Mar 2002 15:33:54 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Goncalves",
"Sergio M. C. V.",
"",
"Yale"
],
[
"Jhingan",
"Sanjay",
"",
"YITP, Japan"
]
] | We find analytical solutions describing the collapse of an infinitely long cylindrical shell of counter-rotating dust. We show that--for the classes of solutions discussed herein--from regular initial data a curvature singularity inevitably develops, and no apparent horizons form, thus in accord with the spirit of the ... |
1812.10297 | Ion Vasile Vancea | Ion V. Vancea | Graviton spectrum in simplified Dark Matter models with graviton
mediators in the de Sitter space | Typos corrected. A new section on the scalar Dark Matter model added | Universe 2019, 5, 39 | 10.3390/universe5010039 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is the second in a series of papers investigating the formulation of the
simplified Dark Matter models with graviton mediators in cosmological
backgrounds. We address here the crucial problem of the fundamental observable
of interest, namely the graviton spectrum in a FRW cosmological background with
an arbitrar... | [
{
"created": "Wed, 26 Dec 2018 12:47:12 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Jan 2019 19:49:47 GMT",
"version": "v2"
}
] | 2019-01-28 | [
[
"Vancea",
"Ion V.",
""
]
] | This is the second in a series of papers investigating the formulation of the simplified Dark Matter models with graviton mediators in cosmological backgrounds. We address here the crucial problem of the fundamental observable of interest, namely the graviton spectrum in a FRW cosmological background with an arbitrary ... |
2112.11526 | Valerio Faraoni | Valerio Faraoni | Helmoltz problem for the Riccati equation from an analogous Friedmann
equation | 6 pages, no figures, to appear in Eur. Phys. J. C | null | 10.1140/epjc/s10052-021-09966-0 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report a solution of the inverse Lagrangian problem for the first order
Riccati differential equation by means of an analogy with the Friedmann
equation of a suitable Friedmann-Lema\^itre-Robertson-Walker universe in
general relativity. This analogous universe has fine-tuned parameters and is
unphysical, but it su... | [
{
"created": "Tue, 21 Dec 2021 21:19:08 GMT",
"version": "v1"
}
] | 2022-01-26 | [
[
"Faraoni",
"Valerio",
""
]
] | We report a solution of the inverse Lagrangian problem for the first order Riccati differential equation by means of an analogy with the Friedmann equation of a suitable Friedmann-Lema\^itre-Robertson-Walker universe in general relativity. This analogous universe has fine-tuned parameters and is unphysical, but it sugg... |
1909.06103 | Leor Barack | Leor Barack, Marta Colleoni, Thibault Damour, Soichiro Isoyama and
Norichika Sago | Self-force effects on the marginally bound zoom-whirl orbit in
Schwarzschild spacetime | 29 pages, 6 figures | Phys. Rev. D 100, 124015 (2019) | 10.1103/PhysRevD.100.124015 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For a Schwarzchild black hole of mass $M$, we consider a test particle
falling from rest at infinity and becoming trapped, at late time, on the
unstable circular orbit of radius $r=4GM/c^2$. When the particle is endowed
with a small mass, $\mu\ll M$, it experiences an effective gravitational
self-force, whose conserv... | [
{
"created": "Fri, 13 Sep 2019 09:27:19 GMT",
"version": "v1"
}
] | 2019-12-11 | [
[
"Barack",
"Leor",
""
],
[
"Colleoni",
"Marta",
""
],
[
"Damour",
"Thibault",
""
],
[
"Isoyama",
"Soichiro",
""
],
[
"Sago",
"Norichika",
""
]
] | For a Schwarzchild black hole of mass $M$, we consider a test particle falling from rest at infinity and becoming trapped, at late time, on the unstable circular orbit of radius $r=4GM/c^2$. When the particle is endowed with a small mass, $\mu\ll M$, it experiences an effective gravitational self-force, whose conservat... |
1708.02293 | Amalaya Khurshudyan | Martiros Khurshudyan, Asatur Khurshudyan | Some interacting dark energy models | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study new cosmological models involving new forms of
non-gravitational interaction between cold dark matter and dark energy. The
main purpose is to demonstrate the applicability of the forms of interaction to
the problem in modern cosmology known as accelerated expansion of the large
scale universe. ... | [
{
"created": "Mon, 17 Jul 2017 19:48:15 GMT",
"version": "v1"
}
] | 2017-08-09 | [
[
"Khurshudyan",
"Martiros",
""
],
[
"Khurshudyan",
"Asatur",
""
]
] | In this paper we study new cosmological models involving new forms of non-gravitational interaction between cold dark matter and dark energy. The main purpose is to demonstrate the applicability of the forms of interaction to the problem in modern cosmology known as accelerated expansion of the large scale universe. It... |
gr-qc/0608003 | Francisco Lobo | Aaron V. B. Arellano, Francisco S. N. Lobo | Evolving wormhole geometries within nonlinear electrodynamics | 17 pages, 1 figure; to appear in Classical and Quantum Gravity. V2:
minor corrections, including a reference | Class.Quant.Grav. 23 (2006) 5811-5824 | 10.1088/0264-9381/23/20/004 | null | gr-qc astro-ph hep-th | null | In this work, we explore the possibility of evolving (2+1) and
(3+1)-dimensional wormhole spacetimes, conformally related to the respective
static geometries, within the context of nonlinear electrodynamics. For the
(3+1)-dimensional spacetime, it is found that the Einstein field equation
imposes a contracting wormho... | [
{
"created": "Mon, 31 Jul 2006 22:06:08 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Sep 2006 10:36:33 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Arellano",
"Aaron V. B.",
""
],
[
"Lobo",
"Francisco S. N.",
""
]
] | In this work, we explore the possibility of evolving (2+1) and (3+1)-dimensional wormhole spacetimes, conformally related to the respective static geometries, within the context of nonlinear electrodynamics. For the (3+1)-dimensional spacetime, it is found that the Einstein field equation imposes a contracting wormhole... |
2212.14805 | Yolbeiker Rodr\'iguez Baez | Yolbeiker Rodr\'iguez Baez | Critical collapse for the Starobinsky $R^2$ model | 15 pages, 3 figures | null | null | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | We study gravitational collapse for the Starobinsky $R^2$ model, a particular
example of an $f(r)$ theory, in a spherically symmetric spacetime. We add a
massless scalar field as matter content to the spacetime. We work in the
Einstein frame, where an additional scalar field arises due to the conformal
transformation... | [
{
"created": "Fri, 30 Dec 2022 16:11:11 GMT",
"version": "v1"
}
] | 2023-01-02 | [
[
"Baez",
"Yolbeiker Rodríguez",
""
]
] | We study gravitational collapse for the Starobinsky $R^2$ model, a particular example of an $f(r)$ theory, in a spherically symmetric spacetime. We add a massless scalar field as matter content to the spacetime. We work in the Einstein frame, where an additional scalar field arises due to the conformal transformation. ... |
2106.09657 | Albert Bryant | Albert Bryant, Hector O. Silva, Kent Yagi, and Kostas Glampedakis | Eikonal quasinormal modes of black holes beyond general relativity III:
scalar Gauss-Bonnet gravity | 15 pages, 4 figures; accepted to PRD | Phys. Rev. D 104, 044051 (2021) | 10.1103/PhysRevD.104.044051 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent series of papers we have shown how the eikonal/geometrical optics
approximation can be used to calculate analytically the fundamental quasinormal
mode frequencies associated with coupled systems of wave equations, which
arise, for instance, in the study of perturbations of black holes in gravity
theories ... | [
{
"created": "Thu, 17 Jun 2021 17:01:43 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Sep 2021 17:06:42 GMT",
"version": "v2"
}
] | 2021-09-08 | [
[
"Bryant",
"Albert",
""
],
[
"Silva",
"Hector O.",
""
],
[
"Yagi",
"Kent",
""
],
[
"Glampedakis",
"Kostas",
""
]
] | In a recent series of papers we have shown how the eikonal/geometrical optics approximation can be used to calculate analytically the fundamental quasinormal mode frequencies associated with coupled systems of wave equations, which arise, for instance, in the study of perturbations of black holes in gravity theories be... |
2005.08010 | Fabio Moretti | Fabio Moretti, Flavio Bombacigno and Giovanni Montani | Gravitational Landau Damping for massive scalar modes | 11 pages, 4 figures. Comments are welcome | Eur. Phys. J. C 80, 1203 (2020) | 10.1140/epjc/s10052-020-08769-z | null | gr-qc astro-ph.CO astro-ph.GA astro-ph.HE physics.plasm-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We establish the possibility of Landau damping for gravitational scalar waves
which propagate in a non-collisional gas of particles. In particular, under the
hypothesis of homogeneity and isotropy, we describe the medium at the
equilibrium with a J\"uttner-Maxwell distribution, and we analytically
determine the dampi... | [
{
"created": "Sat, 16 May 2020 15:09:10 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jul 2020 16:55:26 GMT",
"version": "v2"
},
{
"created": "Tue, 13 Oct 2020 17:30:47 GMT",
"version": "v3"
},
{
"created": "Thu, 31 Dec 2020 11:02:00 GMT",
"version": "v4"
}
] | 2021-01-01 | [
[
"Moretti",
"Fabio",
""
],
[
"Bombacigno",
"Flavio",
""
],
[
"Montani",
"Giovanni",
""
]
] | We establish the possibility of Landau damping for gravitational scalar waves which propagate in a non-collisional gas of particles. In particular, under the hypothesis of homogeneity and isotropy, we describe the medium at the equilibrium with a J\"uttner-Maxwell distribution, and we analytically determine the damping... |
gr-qc/0701023 | Hongwei Yu | Yunfeng Zhu, Hongwei Yu | Spontaneous excitation of an accelerated multilevel atom in dipole
coupling to the derivative of a scalar field | 11 pages, no figures | Class.Quant.Grav. 24 (2007) 95-103 | 10.1088/0264-9381/24/1/005 | null | gr-qc | null | We study the spontaneous excitation of an accelerated multilevel atom in
dipole coupling to the derivative of a massless quantum scalar field and
separately calculate the contributions of the vacuum fluctuation and radiation
reaction to the rate of change of the mean atomic energy of the atom. It is
found that, in co... | [
{
"created": "Wed, 3 Jan 2007 03:18:48 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Zhu",
"Yunfeng",
""
],
[
"Yu",
"Hongwei",
""
]
] | We study the spontaneous excitation of an accelerated multilevel atom in dipole coupling to the derivative of a massless quantum scalar field and separately calculate the contributions of the vacuum fluctuation and radiation reaction to the rate of change of the mean atomic energy of the atom. It is found that, in cont... |
0806.3959 | Eyo Ita III | Eyo Eyo Ita III | Instanton representation of Plebanski gravity: XVIII. Quantization and
proposed resolution of the Kodama state | 48 pages. Background material for revised journal article | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we have constructed a Hilbert space of states solving the
initial value constraints of GR in the instanton representation of Plebanski
gravity. The states are labelled by two free functions of position constructed
from the eigenvalues of the CDJ matrix. This comprises the physical degrees of
freedom of ... | [
{
"created": "Tue, 24 Jun 2008 19:37:45 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Apr 2010 18:20:14 GMT",
"version": "v2"
}
] | 2010-04-27 | [
[
"Ita",
"Eyo Eyo",
"III"
]
] | In this paper we have constructed a Hilbert space of states solving the initial value constraints of GR in the instanton representation of Plebanski gravity. The states are labelled by two free functions of position constructed from the eigenvalues of the CDJ matrix. This comprises the physical degrees of freedom of GR... |
0709.0093 | Mark Hannam | P. Ajith, M. Boyle, D. A. Brown, S. Fairhurst, M. Hannam, I. Hinder,
S. Husa, B. Krishnan, R. A. Mercer, F. Ohme, C. D. Ott, J. S. Read, L.
Santamaria, J. T. Whelan | Data formats for numerical relativity waves | 21 pages. Original document extensively rewritten to provide a more
detailed metadata description and a more economical file format for hybrid
waveforms | null | null | LIGO-T070072-v3 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This document proposes data formats to exchange numerical relativity results,
in particular gravitational waveforms. The primary goal is to further the
interaction between gravitational-wave source modeling groups and the
gravitational-wave data-analysis community. We present a simple and extendable
format which is a... | [
{
"created": "Sun, 2 Sep 2007 08:31:33 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Apr 2008 10:55:54 GMT",
"version": "v2"
},
{
"created": "Thu, 24 Feb 2011 22:07:52 GMT",
"version": "v3"
}
] | 2011-02-28 | [
[
"Ajith",
"P.",
""
],
[
"Boyle",
"M.",
""
],
[
"Brown",
"D. A.",
""
],
[
"Fairhurst",
"S.",
""
],
[
"Hannam",
"M.",
""
],
[
"Hinder",
"I.",
""
],
[
"Husa",
"S.",
""
],
[
"Krishnan",
"B.",
""
... | This document proposes data formats to exchange numerical relativity results, in particular gravitational waveforms. The primary goal is to further the interaction between gravitational-wave source modeling groups and the gravitational-wave data-analysis community. We present a simple and extendable format which is app... |
2210.11454 | Abhimanyu Susobhanan | Abhimanyu Susobhanan | Post-Newtonian-accurate pulsar timing array signals induced by
inspiralling eccentric binaries: accuracy, computational cost, and
single-pulsar search | Accepted for publication in Classical and Quantum Gravity | null | 10.1088/1361-6382/ace234 | null | gr-qc astro-ph.IM | http://creativecommons.org/licenses/by/4.0/ | Pulsar Timing Array (PTA) experiments are expected to be sensitive to
gravitational waves (GWs) emitted by individual supermassive black hole
binaries (SMBHBs) inspiralling along eccentric orbits. We compare the
computational cost of different methods of computing the PTA signals induced by
relativistic eccentric SMB... | [
{
"created": "Thu, 20 Oct 2022 17:52:13 GMT",
"version": "v1"
},
{
"created": "Tue, 2 May 2023 23:28:39 GMT",
"version": "v2"
},
{
"created": "Tue, 27 Jun 2023 20:25:33 GMT",
"version": "v3"
}
] | 2023-07-03 | [
[
"Susobhanan",
"Abhimanyu",
""
]
] | Pulsar Timing Array (PTA) experiments are expected to be sensitive to gravitational waves (GWs) emitted by individual supermassive black hole binaries (SMBHBs) inspiralling along eccentric orbits. We compare the computational cost of different methods of computing the PTA signals induced by relativistic eccentric SMBHB... |
gr-qc/0210067 | Sergey S. Kokarev | Yu.S.Vladimirov, S.S.Kokarev | 4-D homogeneous isotropic cosmological models generated by the 5-D
vacuum | Latex 2e, 8 pages | Gen.Rel.Grav.29:141-151,1997 | 10.1023/A:1010260326007 | null | gr-qc | null | 4-dimensional homogeneous isotropic cosmological models obtained from
solutions of vacuum 5-dimensional Einstein equations are considered. It is
assumed, that the G(55)-component of the 5-d metric simulates matter in the
comoving frame of reference. Observable 4-d metric is defined up to conformal
transformations of ... | [
{
"created": "Sat, 19 Oct 2002 15:30:51 GMT",
"version": "v1"
}
] | 2010-12-01 | [
[
"Vladimirov",
"Yu. S.",
""
],
[
"Kokarev",
"S. S.",
""
]
] | 4-dimensional homogeneous isotropic cosmological models obtained from solutions of vacuum 5-dimensional Einstein equations are considered. It is assumed, that the G(55)-component of the 5-d metric simulates matter in the comoving frame of reference. Observable 4-d metric is defined up to conformal transformations of th... |
2312.11131 | Mei-Ning Duan | Rong-Gen Cai, Mei-Ning Duan, Li Li and Fu-Guo Yang | Towards classifying the interior dynamics of charged black holes with
scalar hair | Published version | JHEP 02(2024)169 | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The study of the interior of hairy black holes has received significant
attention recently. This paper builds upon our recent analytical approach to
investigate the internal dynamics of charged black holes with scalar hair in
general spacetime dimensions. The geometries of these hairy balck holes end at
a spacelike s... | [
{
"created": "Mon, 18 Dec 2023 12:04:05 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Feb 2024 11:08:26 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Feb 2024 03:05:23 GMT",
"version": "v3"
}
] | 2024-02-27 | [
[
"Cai",
"Rong-Gen",
""
],
[
"Duan",
"Mei-Ning",
""
],
[
"Li",
"Li",
""
],
[
"Yang",
"Fu-Guo",
""
]
] | The study of the interior of hairy black holes has received significant attention recently. This paper builds upon our recent analytical approach to investigate the internal dynamics of charged black holes with scalar hair in general spacetime dimensions. The geometries of these hairy balck holes end at a spacelike sin... |
gr-qc/9710055 | Michael Pfenning | Michael J. Pfenning and L. H. Ford | Scalar Field Quantum Inequalities in Static Spacetimes | 27 pages, 2 Encapsulated Postscript figures, uses epsf.tex, typeset
in RevTex | Phys. Rev. D 57, 3489 (1998) | 10.1103/PhysRevD.57.3489 | TUTP-97-10 | gr-qc hep-th | null | We discuss quantum inequalities for minimally coupled scalar fields in static
spacetimes. These are inequalities which place limits on the magnitude and
duration of negative energy densities. We derive a general expression for the
quantum inequality for a static observer in terms of a Euclidean two-point
function. In... | [
{
"created": "Thu, 9 Oct 1997 22:47:29 GMT",
"version": "v1"
}
] | 2016-08-25 | [
[
"Pfenning",
"Michael J.",
""
],
[
"Ford",
"L. H.",
""
]
] | We discuss quantum inequalities for minimally coupled scalar fields in static spacetimes. These are inequalities which place limits on the magnitude and duration of negative energy densities. We derive a general expression for the quantum inequality for a static observer in terms of a Euclidean two-point function. In a... |
0812.1013 | Genly Le\'on | Genly Leon | On the Past Asymptotic Dynamics of Non-minimally Coupled Dark Energy | 38 pages, 2 figures, accepted for publication in CQG | Class.Quant.Grav.26:035008,2009 | 10.1088/0264-9381/26/3/035008 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply dynamical systems techniques to investigate cosmological models
inspired in scalar-tensor theories written in the Einstein frame. We prove that
if the potential and the coupling function are sufficiently smooth functions,
the scalar field almost always diverges into the past. The dynamics of two
important in... | [
{
"created": "Thu, 4 Dec 2008 19:37:41 GMT",
"version": "v1"
}
] | 2009-12-04 | [
[
"Leon",
"Genly",
""
]
] | We apply dynamical systems techniques to investigate cosmological models inspired in scalar-tensor theories written in the Einstein frame. We prove that if the potential and the coupling function are sufficiently smooth functions, the scalar field almost always diverges into the past. The dynamics of two important inva... |
2008.08327 | Benrong Mu | Jing Liang, Xiaobo Guo, Deyou Chen and Benrong Mu | Remarks on the weak cosmic censorship conjecture of RN-AdS black holes
with cloud of strings and quintessence under the scalar field | 19 pages, 10 figures | null | 10.1016/j.nuclphysb.2021.115335 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the thermodynamics and weak cosmic censorship
conjecture in a RN-AdS black hole with the cloud of strings and quintessence by
the scattering of a scalar field. The variations of the thermodynamic variables
are calculated in the normal and extended phase spaces. In the normal phase
space,... | [
{
"created": "Wed, 19 Aug 2020 08:33:30 GMT",
"version": "v1"
}
] | 2021-02-24 | [
[
"Liang",
"Jing",
""
],
[
"Guo",
"Xiaobo",
""
],
[
"Chen",
"Deyou",
""
],
[
"Mu",
"Benrong",
""
]
] | In this paper, we investigate the thermodynamics and weak cosmic censorship conjecture in a RN-AdS black hole with the cloud of strings and quintessence by the scattering of a scalar field. The variations of the thermodynamic variables are calculated in the normal and extended phase spaces. In the normal phase space, w... |
gr-qc/0604020 | Sergey Cherkas L | S. L. Cherkas and V. L. Kalashnikov | Decelerating and accelerating back-reaction of vacuum to the Universe
expansion | 10 pages | Proc. Int. Conf. Bolyai-Gauss-Lobachevsky: Noneuclidian Geometry
in Modern Physics (Minsk, October 10-13, 2006)} ed. Yu. Kurochkin and V.
Red'kov (Minsk: B.I. Stepanov Institute of Physics) pp 188-195 | null | null | gr-qc | null | Back-reaction of the massless scalar field vacuum to the Universe expansion
is considered. Automatic renormalization procedure based on the equations of
motion instead of the Friedman equation is used to avoid the cosmological
constant problem. It is found, that the vacuum tends to decelerate an expansion
of Universe... | [
{
"created": "Wed, 5 Apr 2006 15:39:56 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Jun 2006 09:45:51 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Cherkas",
"S. L.",
""
],
[
"Kalashnikov",
"V. L.",
""
]
] | Back-reaction of the massless scalar field vacuum to the Universe expansion is considered. Automatic renormalization procedure based on the equations of motion instead of the Friedman equation is used to avoid the cosmological constant problem. It is found, that the vacuum tends to decelerate an expansion of Universe i... |
1501.07685 | Diogo Capelo | Diogo Capelo, Jorge P\'aramos | Cosmological implications of Bumblebee vector models | 11 pages, 10 figures, 1 table. Accepted for publication in PRD | null | 10.1103/PhysRevD.91.104007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Bumblebee Model of spontaneous Lorentz symmetry breaking is explored in a
cosmological context, considering a single non-zero time component for the
vector field. The relevant dynamic equations for the evolution of the Universe
are derived and its properties and physical significance studied. We conclude
that a l... | [
{
"created": "Fri, 30 Jan 2015 07:31:28 GMT",
"version": "v1"
},
{
"created": "Tue, 19 May 2015 17:35:18 GMT",
"version": "v2"
}
] | 2015-05-27 | [
[
"Capelo",
"Diogo",
""
],
[
"Páramos",
"Jorge",
""
]
] | The Bumblebee Model of spontaneous Lorentz symmetry breaking is explored in a cosmological context, considering a single non-zero time component for the vector field. The relevant dynamic equations for the evolution of the Universe are derived and its properties and physical significance studied. We conclude that a lat... |
2406.09036 | Haomin Rao | Haomin Rao, Chunhui Liu and Chao-Qiang Geng | Thermodynamic of the $f(Q)$ universe | 23 pages, 1 figure | null | null | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | We investigate thermodynamics of apparent horizon in the $f(Q)$ universe with
trivial and nontrivial connections. We first explore the perspectives of the
first law, generalized second law and $P-V$ phase transition with trivial
connection. We show that the lowest-order correction of entropy has the same
form as that... | [
{
"created": "Thu, 13 Jun 2024 12:18:08 GMT",
"version": "v1"
}
] | 2024-06-14 | [
[
"Rao",
"Haomin",
""
],
[
"Liu",
"Chunhui",
""
],
[
"Geng",
"Chao-Qiang",
""
]
] | We investigate thermodynamics of apparent horizon in the $f(Q)$ universe with trivial and nontrivial connections. We first explore the perspectives of the first law, generalized second law and $P-V$ phase transition with trivial connection. We show that the lowest-order correction of entropy has the same form as that i... |
1211.5410 | Huan Yang | Huan Yang, Haixing Miao, and Yanbei Chen | First-Order Perturbative Hamiltonian Equations of Motion for a Point
Particle Orbiting a Schwarzschild Black Hole | 16 pages, comments are welcome | Phys. Rev. D 89, 104050 (2014) | 10.1103/PhysRevD.89.104050 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We formulate a spherical harmonically decomposed 1+1 scheme to
self-consistently evolve the trajectory of a point particle and its
gravitational metric perturbation to a Schwarzschild background spacetime.
Following the work of Moncrief, we write down an action for perturbations in
space-time geometry, combine that w... | [
{
"created": "Fri, 23 Nov 2012 05:21:47 GMT",
"version": "v1"
}
] | 2014-05-28 | [
[
"Yang",
"Huan",
""
],
[
"Miao",
"Haixing",
""
],
[
"Chen",
"Yanbei",
""
]
] | We formulate a spherical harmonically decomposed 1+1 scheme to self-consistently evolve the trajectory of a point particle and its gravitational metric perturbation to a Schwarzschild background spacetime. Following the work of Moncrief, we write down an action for perturbations in space-time geometry, combine that wit... |
gr-qc/0311016 | Bernard Leong | Bernard Leong (Sanger Institute, Cambridge) | Spin-Torsion, Braneworlds and Changing Symmetry in the Universe | Ph.D thesis, Feb 2003, University of Cambridge | null | null | null | gr-qc astro-ph | null | In this thesis, we explore three phenomenological alternatives to the current
paradigm of the standard inflationary big bang scenario. The three alternative
themes are spin torsion (or Einstein-Cartan-Kibble-Sciama) theories, extra
dimensions (braneworld cosmology) and changing global symmetry. In the spin
torsion th... | [
{
"created": "Wed, 5 Nov 2003 16:46:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Leong",
"Bernard",
"",
"Sanger Institute, Cambridge"
]
] | In this thesis, we explore three phenomenological alternatives to the current paradigm of the standard inflationary big bang scenario. The three alternative themes are spin torsion (or Einstein-Cartan-Kibble-Sciama) theories, extra dimensions (braneworld cosmology) and changing global symmetry. In the spin torsion theo... |
1811.00611 | Philipp Hoehn | Philipp A Hoehn | Switching internal times and a new perspective on the 'wave function of
the universe' | 14+7 pages. Invited contribution to the special issue "Progress in
Group Field Theory and Related Quantum Gravity Formalisms", Eds. S. Carrozza,
S. Gielen and D. Oriti. Minor clarifications, updated references, matches
published version | Universe 5(5), 116 (2019) | 10.3390/universe5050116 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Despite its importance in general relativity, a quantum notion of general
covariance has not yet been established in quantum gravity and cosmology,
where, given the a priori absence of coordinates, it is necessary to replace
classical frames with dynamical quantum reference systems. As such, quantum
general covarianc... | [
{
"created": "Thu, 1 Nov 2018 19:53:42 GMT",
"version": "v1"
},
{
"created": "Sun, 19 May 2019 15:32:05 GMT",
"version": "v2"
}
] | 2019-07-16 | [
[
"Hoehn",
"Philipp A",
""
]
] | Despite its importance in general relativity, a quantum notion of general covariance has not yet been established in quantum gravity and cosmology, where, given the a priori absence of coordinates, it is necessary to replace classical frames with dynamical quantum reference systems. As such, quantum general covariance ... |
1310.7900 | Tony Chu | Tony Chu | Including realistic tidal deformations in binary black-hole initial data | 15 pages, 13 figures, 2 tables; minor typo fixes and text revisions | Phys. Rev. D 89, 064062 (2014) | 10.1103/PhysRevD.89.064062 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A shortcoming of current binary black-hole initial data is the generation of
spurious gravitational radiation, so-called junk radiation, when they are
evolved. This problem is a consequence of an oversimplified modeling of the
binary's physics in the initial data. Since junk radiation is not
astrophysically realistic... | [
{
"created": "Tue, 29 Oct 2013 18:01:48 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Nov 2013 09:15:38 GMT",
"version": "v2"
}
] | 2014-04-02 | [
[
"Chu",
"Tony",
""
]
] | A shortcoming of current binary black-hole initial data is the generation of spurious gravitational radiation, so-called junk radiation, when they are evolved. This problem is a consequence of an oversimplified modeling of the binary's physics in the initial data. Since junk radiation is not astrophysically realistic, ... |
0710.2042 | Cosimo Bambi | Cosimo Bambi | Gravitomagnetism in superconductors and compact stars | 9 pages, no figure | Int.J.Mod.Phys.D17:327-336,2008 | 10.1142/S0218271808012036 | WSU-HEP-0706 | gr-qc | null | There are three experimentally observed effects in rotating superconductors
that are so far unexplained. Some authors have tried to interpret such a
phenomena as possible new gravitational properties of coherent quantum systems:
in particular, they suggest that the gravitomagnetic field of that kind of
matter may be ... | [
{
"created": "Wed, 10 Oct 2007 15:27:54 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bambi",
"Cosimo",
""
]
] | There are three experimentally observed effects in rotating superconductors that are so far unexplained. Some authors have tried to interpret such a phenomena as possible new gravitational properties of coherent quantum systems: in particular, they suggest that the gravitomagnetic field of that kind of matter may be ma... |
0906.0156 | Bijan Saha | Bijan Saha and Mihai Visinescu | Bianchi type-I model with cosmic string in the presence of a magnetic
field: spinor description | 14 pages, 4 figures, new figus are added, singularity and
isotropization process are discussed in detail | Int.J.Theor.Phys.49 (2010) 1411 - 1421 | 10.1007/s10773-010-0319-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A Bianchi type-I cosmological model in the presence of a magnetic flux along
a cosmic string is investigated. A nonlinear spinor field is used to simulate
the cosmological cloud of strings. It is shown that the spinor field simulation
offer the possibility to solve the system of Einstein's equation without any
additi... | [
{
"created": "Sun, 31 May 2009 14:10:00 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Jan 2010 12:07:14 GMT",
"version": "v2"
}
] | 2015-05-01 | [
[
"Saha",
"Bijan",
""
],
[
"Visinescu",
"Mihai",
""
]
] | A Bianchi type-I cosmological model in the presence of a magnetic flux along a cosmic string is investigated. A nonlinear spinor field is used to simulate the cosmological cloud of strings. It is shown that the spinor field simulation offer the possibility to solve the system of Einstein's equation without any addition... |
0711.1279 | Carlos Augusto Romero Filho | Fabio Dahia, Carlos Romero, Lucio F. P. Silva, Reza Tavakol | Geodesic motion in the neighbourhood of submanifolds embedded in warped
product spaces | 8 pages, 1 figure. To appear in General Relativity and Gravitation as
a contributed paper to Mashhoon Festschrift | Gen.Rel.Grav.40:1341-1351,2008 | 10.1007/s10714-008-0611-y | null | gr-qc | null | We study the classical geodesic motions of nonzero rest mass test particles
and photons in (3+1+n)- dimensional warped product spaces. An important feature
of these spaces is that they allow a natural decoupling between the motions in
the (3+1)-dimensional spacetime and those in the extra n dimensions. Using this
dec... | [
{
"created": "Thu, 8 Nov 2007 14:08:01 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Dahia",
"Fabio",
""
],
[
"Romero",
"Carlos",
""
],
[
"Silva",
"Lucio F. P.",
""
],
[
"Tavakol",
"Reza",
""
]
] | We study the classical geodesic motions of nonzero rest mass test particles and photons in (3+1+n)- dimensional warped product spaces. An important feature of these spaces is that they allow a natural decoupling between the motions in the (3+1)-dimensional spacetime and those in the extra n dimensions. Using this decou... |
2407.06696 | Dipankar Laya | Dipankar Laya, Sourav Dutta, Subenoy Chakraborty | Quantum Cosmology in Coupled Brans-Dicke Gravity: A Noether Symmetry
Analysis | 14 pages, 4 figures | null | 10.1142/S0218271823500013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present work deals with a multi-field cosmological model in a spatially
flat FLRW space-time geometry. The usual Brans-Dicke(BD) field and another
scalar field are minimally coupled to gravity while they interact with each
other through the Kinetic terms. {The main aim of the present work is to
examine whether th... | [
{
"created": "Tue, 9 Jul 2024 09:13:52 GMT",
"version": "v1"
}
] | 2024-07-10 | [
[
"Laya",
"Dipankar",
""
],
[
"Dutta",
"Sourav",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | The present work deals with a multi-field cosmological model in a spatially flat FLRW space-time geometry. The usual Brans-Dicke(BD) field and another scalar field are minimally coupled to gravity while they interact with each other through the Kinetic terms. {The main aim of the present work is to examine whether the ... |
gr-qc/0511004 | Ernesto F. Eiroa | Ernesto F. Eiroa | Braneworld black holes as gravitational lenses | 7 pages, 1 figure, to appear in the Brazilian Journal of Physics
(proceedings of the Conference 100 Years of Relativity, Sao Paulo, Brazil,
August 2005) | Braz.J.Phys. 35 (2005) 1113-1116 | 10.1590/S0103-97332005000700026 | null | gr-qc astro-ph hep-ph | null | Black holes acting as gravitational lenses produce, besides the primary and
secondary weak field images, two infinite sets of relativistic images. These
images can be studied using the strong field limit, an analytic method based on
a logarithmic asymptotic approximation of the deflection angle. In this work,
branewo... | [
{
"created": "Tue, 1 Nov 2005 19:10:08 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Eiroa",
"Ernesto F.",
""
]
] | Black holes acting as gravitational lenses produce, besides the primary and secondary weak field images, two infinite sets of relativistic images. These images can be studied using the strong field limit, an analytic method based on a logarithmic asymptotic approximation of the deflection angle. In this work, braneworl... |
gr-qc/9911089 | Lior M. Burko | Lior M. Burko | Self-force approach for radiation reaction | Talk given at the 3rd Edoardo Amaldi Conference on Gravitational
Waves, 12-16 July, 1999 | Gravitational Waves: Third Edoardo Amaldi Conference, S. Meshkov
(ed) (AIP, New York, 2000), p.p., 86-89 | 10.1063/1.1291844 | null | gr-qc | null | We overview the recently proposed mode-sum regularization prescription (MSRP)
for the calculation of the local radiation-reaction forces, which are crucial
for the orbital evolution of binaries. We then describe some new results which
were obtained using MSRP, and discuss their importance for gravitational-wave
astro... | [
{
"created": "Tue, 23 Nov 1999 23:50:18 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Dec 1999 23:09:00 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Burko",
"Lior M.",
""
]
] | We overview the recently proposed mode-sum regularization prescription (MSRP) for the calculation of the local radiation-reaction forces, which are crucial for the orbital evolution of binaries. We then describe some new results which were obtained using MSRP, and discuss their importance for gravitational-wave astrono... |
gr-qc/0508121 | Y. Jack Ng | W.A. Christiansen, Y. Jack Ng and H. van Dam (University of North
Carolina) | Probing spacetime foam with extragalactic sources | LaTeX, 11 pages, 1 figure; version submitted to PRL; several
references added; very useful comments and suggestions by Eric Perlman
incorporated | Phys.Rev.Lett. 96 (2006) 051301 | 10.1103/PhysRevLett.96.051301 | null | gr-qc astro-ph hep-ph hep-th quant-ph | null | Due to quantum fluctuations, spacetime is probably ``foamy'' on very small
scales. We propose to detect this texture of spacetime foam by looking for
core-halo structures in the images of distant quasars. We find that the Very
Large Telescope interferometer will be on the verge of being able to probe the
fabric of sp... | [
{
"created": "Mon, 29 Aug 2005 20:04:22 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Dec 2005 21:39:08 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Christiansen",
"W. A.",
"",
"University of North\n Carolina"
],
[
"Ng",
"Y. Jack",
"",
"University of North\n Carolina"
],
[
"van Dam",
"H.",
"",
"University of North\n Carolina"
]
] | Due to quantum fluctuations, spacetime is probably ``foamy'' on very small scales. We propose to detect this texture of spacetime foam by looking for core-halo structures in the images of distant quasars. We find that the Very Large Telescope interferometer will be on the verge of being able to probe the fabric of spac... |
2207.01080 | Nomaan X | Abhishek Mathur, Sumati Surya and Nomaan X | Spacetime Entanglement Entropy: Covariance and Discreteness | 26 pages, 12 figures, to appear in a special issue of Gen. Rel. Grav.
in memory of Prof. Thanu Padmanabhan ("Paddy") | null | 10.1007/s10714-022-02948-x | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We review some recent results on Sorkin's spacetime formulation of the
entanglement entropy (SSEE) for a free quantum scalar field both in the
continuum and in manifold-like causal sets. The SSEE for a causal diamond in a
2d cylinder spacetime has been shown to have a Calabrese-Cardy form, while for
de Sitter and Sch... | [
{
"created": "Sun, 3 Jul 2022 17:18:03 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Jul 2022 08:21:11 GMT",
"version": "v2"
}
] | 2022-08-03 | [
[
"Mathur",
"Abhishek",
""
],
[
"Surya",
"Sumati",
""
],
[
"X",
"Nomaan",
""
]
] | We review some recent results on Sorkin's spacetime formulation of the entanglement entropy (SSEE) for a free quantum scalar field both in the continuum and in manifold-like causal sets. The SSEE for a causal diamond in a 2d cylinder spacetime has been shown to have a Calabrese-Cardy form, while for de Sitter and Schwa... |
1910.02699 | Ryotaro Kase | Ryotaro Kase and Shinji Tsujikawa | Scalar-field dark energy nonminimally and kinetically coupled to dark
matter | published version with corrections, 24 pages | Phys. Rev. D 101, 063511 (2020) | 10.1103/PhysRevD.101.063511 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a general framework for studying the dark energy cosmology in
which a scalar field $\phi$ is nonminimally and kinetically coupled to Cold
Dark Matter (CDM). The scalar-graviton sector is described by the action of
Horndeski theories with the speed of gravitational waves equivalent to that of
light, whereas... | [
{
"created": "Mon, 7 Oct 2019 10:06:46 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Mar 2020 01:06:19 GMT",
"version": "v2"
}
] | 2020-03-18 | [
[
"Kase",
"Ryotaro",
""
],
[
"Tsujikawa",
"Shinji",
""
]
] | We provide a general framework for studying the dark energy cosmology in which a scalar field $\phi$ is nonminimally and kinetically coupled to Cold Dark Matter (CDM). The scalar-graviton sector is described by the action of Horndeski theories with the speed of gravitational waves equivalent to that of light, whereas C... |
gr-qc/0610066 | Albert Roura | B. L. Hu, Albert Roura | Black hole fluctuations and dynamics from back-reaction of Hawking
radiation: Current work and further studies based on stochastic gravity | Invited talk given by BLH at the VII Asia-Pacific International
Conference on Gravitation and Astrophysics, National Central University,
Taiwan (November, 2005); to appear in the Proceedings edited by C. M. Chen,
J. M. Nester and J. P. Hsu (World Scientific, Singapore, 2007) p. 236 | null | 10.1142/9789812772923_0029 | null | gr-qc | null | We give a progress report of our research on spacetime fluctuations induced
by quantum fields in an evaporating black hole and a black hole in
quasi-equilibrium with its Hawking radiation. We note the main issues involved
in these two classes of problems and outline the key steps for a systematic
quantitative investi... | [
{
"created": "Fri, 13 Oct 2006 05:19:22 GMT",
"version": "v1"
}
] | 2016-11-09 | [
[
"Hu",
"B. L.",
""
],
[
"Roura",
"Albert",
""
]
] | We give a progress report of our research on spacetime fluctuations induced by quantum fields in an evaporating black hole and a black hole in quasi-equilibrium with its Hawking radiation. We note the main issues involved in these two classes of problems and outline the key steps for a systematic quantitative investiga... |
1705.01065 | Diego Rubiera-Garcia | V. I. Afonso, Gonzalo J. Olmo, D. Rubiera-Garcia | Scalar geons in Born-Infeld gravity | 19 pages (double column), 21 figures. Typos corrected, references
updated. An appendix has been added. Version accepted for publication in JCAP | null | 10.1088/1475-7516/2017/08/031 | IFIC/17-22 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The existence of static, spherically symmetric, self-gravitating scalar field
solutions in the context of Born-Infeld gravity is explored. Upon a combination
of analytical approximations and numerical methods, the equations for a free
scalar field (without a potential term) are solved, verifying that the
solutions re... | [
{
"created": "Tue, 2 May 2017 16:45:19 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Jul 2017 09:04:03 GMT",
"version": "v2"
},
{
"created": "Mon, 14 Aug 2017 06:19:23 GMT",
"version": "v3"
}
] | 2017-09-06 | [
[
"Afonso",
"V. I.",
""
],
[
"Olmo",
"Gonzalo J.",
""
],
[
"Rubiera-Garcia",
"D.",
""
]
] | The existence of static, spherically symmetric, self-gravitating scalar field solutions in the context of Born-Infeld gravity is explored. Upon a combination of analytical approximations and numerical methods, the equations for a free scalar field (without a potential term) are solved, verifying that the solutions reco... |
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