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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1209.2913 | Gerald Kaiser | Gerald Kaiser | Electromagnetic helicity wavelets: a model for quasar engines? | 22 pages, 2 figures | null | null | null | gr-qc astro-ph.CO math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The complex distance function $\zeta$, which plays a prominent role in the
definition of scalar (acoustic) wavelets, is found to determine a complex
extension of the spherical coordinate system that is ideally suited for the
construction of highly focused electromagnetic beams with helicities conforming
to the oblate... | [
{
"created": "Thu, 13 Sep 2012 14:46:43 GMT",
"version": "v1"
}
] | 2014-07-15 | [
[
"Kaiser",
"Gerald",
""
]
] | The complex distance function $\zeta$, which plays a prominent role in the definition of scalar (acoustic) wavelets, is found to determine a complex extension of the spherical coordinate system that is ideally suited for the construction of highly focused electromagnetic beams with helicities conforming to the oblate s... |
1309.7186 | Euro Spallucci | A. Aurilia, E.spallucci | Planck's uncertainty principle and the saturation of Lorentz boosts by
Planckian black holes | 10 pages; 1 figure. Due to the recent interest for the UV
self-complete, quantum gravity scenario, we post this note which was
submitted to the gravity Research Foundation for the 2002-03 competition and
never published since then | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A basic inconsistency arises when the Theory of Special Relativity meets with
quantum phenomena at the Planck scale. Specifically, the Planck length is
Lorentz invariant and should not be affected by a Lorentz boost. We argue that
Planckian relativity must necessarily involve the effect of black hole
formation. Recen... | [
{
"created": "Fri, 27 Sep 2013 10:00:52 GMT",
"version": "v1"
}
] | 2013-09-30 | [
[
"Aurilia",
"A.",
""
],
[
"spallucci",
"E.",
""
]
] | A basic inconsistency arises when the Theory of Special Relativity meets with quantum phenomena at the Planck scale. Specifically, the Planck length is Lorentz invariant and should not be affected by a Lorentz boost. We argue that Planckian relativity must necessarily involve the effect of black hole formation. Recent ... |
2001.02591 | Sayantani Bera | Shreya Banerjee, Sayantani Bera, David F. Mota | Growth of Linear Perturbations in a Universe with Superfluid Dark Matter | 16 pages, 6 figures | null | 10.1088/1475-7516/2020/07/034 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Lambda-Cold Dark Matter (LCDM) model agrees with most of the cosmological
observations, but has some hindrances from observed data at smaller scales such
as galaxies. Recently, Berezhiani and Khoury (2015) proposed a new theory
involving interacting superfluid dark matter with three model parameters, which
explai... | [
{
"created": "Wed, 8 Jan 2020 16:02:14 GMT",
"version": "v1"
}
] | 2020-07-22 | [
[
"Banerjee",
"Shreya",
""
],
[
"Bera",
"Sayantani",
""
],
[
"Mota",
"David F.",
""
]
] | The Lambda-Cold Dark Matter (LCDM) model agrees with most of the cosmological observations, but has some hindrances from observed data at smaller scales such as galaxies. Recently, Berezhiani and Khoury (2015) proposed a new theory involving interacting superfluid dark matter with three model parameters, which explains... |
1609.00787 | Wu-Sheng Dai | Yu-Zhu Chen, Wen-Du Li, Wu-Sheng Dai | Why the entropy of spacetime is independent of species of particles --
the species problem | null | Eur. Phys. J. C (2018) 78:635 | 10.1140/epjc/s10052-018-6108-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Hawking radiation emits all species of particles, but the
Bekenstein-Hawking entropy is independent of the number of the species of
particles. This is the so-called species problem --- a puzzling problem for a
long time. In this paper, we suggest a solution to this problem. A result of
the scheme is that the blac... | [
{
"created": "Sat, 3 Sep 2016 03:07:06 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Jun 2017 16:36:49 GMT",
"version": "v2"
}
] | 2018-08-16 | [
[
"Chen",
"Yu-Zhu",
""
],
[
"Li",
"Wen-Du",
""
],
[
"Dai",
"Wu-Sheng",
""
]
] | The Hawking radiation emits all species of particles, but the Bekenstein-Hawking entropy is independent of the number of the species of particles. This is the so-called species problem --- a puzzling problem for a long time. In this paper, we suggest a solution to this problem. A result of the scheme is that the black ... |
1604.07192 | Jose Luis Hernandez-Pastora | J.L. Hernandez-Pastora, J. Martin and E. Ruiz | Source integrals of multipole moments for static space-times | 26 pages | null | 10.1088/0264-9381/33/22/225009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The definition of Komar for the mass of a relativistic source is used as a
starting point to introduce volume integrals for Relativistic Multipole Moments
(RMM). A certain generalization of the classical Gauss theorem is used to
rewrite these multipole moments as integrals over a surface at the infinity.
Therefore it... | [
{
"created": "Mon, 25 Apr 2016 10:04:23 GMT",
"version": "v1"
}
] | 2016-11-23 | [
[
"Hernandez-Pastora",
"J. L.",
""
],
[
"Martin",
"J.",
""
],
[
"Ruiz",
"E.",
""
]
] | The definition of Komar for the mass of a relativistic source is used as a starting point to introduce volume integrals for Relativistic Multipole Moments (RMM). A certain generalization of the classical Gauss theorem is used to rewrite these multipole moments as integrals over a surface at the infinity. Therefore it i... |
1104.4120 | Piero Nicolini | Jonas R. Mureika and Piero Nicolini | Aspects of noncommutative (1+1)-dimensional black holes | 24 pages, 12 figures, some comments added, conclusions not modified,
version matching that published on PRD | Phys.Rev.D84:044020,2011 | 10.1103/PhysRevD.84.044020 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a comprehensive analysis of the spacetime structure and
thermodynamics of $(1+1)-$dimensional black holes in a noncommutative
framework. It is shown that a wider variety of solutions are possible than the
commutative case considered previously in the literature. As expected, the
introduction of a minimal l... | [
{
"created": "Wed, 20 Apr 2011 20:00:14 GMT",
"version": "v1"
},
{
"created": "Mon, 9 May 2011 16:41:15 GMT",
"version": "v2"
},
{
"created": "Fri, 5 Aug 2011 06:03:17 GMT",
"version": "v3"
}
] | 2015-03-19 | [
[
"Mureika",
"Jonas R.",
""
],
[
"Nicolini",
"Piero",
""
]
] | We present a comprehensive analysis of the spacetime structure and thermodynamics of $(1+1)-$dimensional black holes in a noncommutative framework. It is shown that a wider variety of solutions are possible than the commutative case considered previously in the literature. As expected, the introduction of a minimal len... |
1105.0502 | Chiang-Mei Chen | Jian-Liang Liu, Chiang-Mei Chen, James M Nester | Quasi-local energy and the choice of reference | 21 pages; revised version to appear in CQG | null | 10.1088/0264-9381/28/19/195019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A quasi-local energy for Einstein's general relativity is defined by the
value of the preferred boundary term in the covariant Hamiltonian formalism.
The boundary term depends upon a choice of reference and a time-like
displacement vector field (which can be associated with an observer) on the
boundary of the region.... | [
{
"created": "Tue, 3 May 2011 07:42:24 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Sep 2011 08:20:52 GMT",
"version": "v2"
}
] | 2015-05-28 | [
[
"Liu",
"Jian-Liang",
""
],
[
"Chen",
"Chiang-Mei",
""
],
[
"Nester",
"James M",
""
]
] | A quasi-local energy for Einstein's general relativity is defined by the value of the preferred boundary term in the covariant Hamiltonian formalism. The boundary term depends upon a choice of reference and a time-like displacement vector field (which can be associated with an observer) on the boundary of the region. H... |
2210.06717 | Phearun Rithy | Bilguun Bayarsaikhan, Sunly Khimphun, Phearun Rithy and Gansukh
Tumurtushaa | Dynamical analysis in regularized $4D$ Einstein-Gauss-Bonnet gravity
with non-minimal coupling | 16 pages, 3 figures | Eur. Phys. J. C 83, 238 (2023) | 10.1140/epjc/s10052-023-11346-9 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We investigate the regularized four-dimensional Einstein-Gauss-Bonnet ($4D$
EGB) gravity with a non-minimal scalar coupling function, which is an extension
of the regularized $4D$ EGB theory. By introducing non-minimal coupling to the
Gauss-Bonnet term, we demonstrate the additional contribution to the dynamical
equa... | [
{
"created": "Thu, 13 Oct 2022 04:17:57 GMT",
"version": "v1"
}
] | 2023-03-23 | [
[
"Bayarsaikhan",
"Bilguun",
""
],
[
"Khimphun",
"Sunly",
""
],
[
"Rithy",
"Phearun",
""
],
[
"Tumurtushaa",
"Gansukh",
""
]
] | We investigate the regularized four-dimensional Einstein-Gauss-Bonnet ($4D$ EGB) gravity with a non-minimal scalar coupling function, which is an extension of the regularized $4D$ EGB theory. By introducing non-minimal coupling to the Gauss-Bonnet term, we demonstrate the additional contribution to the dynamical equati... |
gr-qc/9710125 | Justino Martinez | L. Herrera, J. Martinez | Gravitational collapse: A case for thermal relaxation | 33 pages, LaTex 2.09, 11 Postscript figures. To be published in
General Relativity and Gravitation | Gen.Rel.Grav. 30 (1998) 445-471 | 10.1023/A:1018862910233 | null | gr-qc astro-ph | null | Two relativistic models for collapsing spheres at different stages of
evolution, which include pre-relaxation processes, are presented. The influence
of relaxation time on the outcome of evolution in both cases is exhibited and
established. It is shown that relaxation processes can drastically change the
final state ... | [
{
"created": "Tue, 28 Oct 1997 21:04:21 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Herrera",
"L.",
""
],
[
"Martinez",
"J.",
""
]
] | Two relativistic models for collapsing spheres at different stages of evolution, which include pre-relaxation processes, are presented. The influence of relaxation time on the outcome of evolution in both cases is exhibited and established. It is shown that relaxation processes can drastically change the final state of... |
0806.0608 | Olivier Sarbach | J.A. Gonzalez, F.S. Guzman, O. Sarbach | Instability of wormholes supported by a ghost scalar field. I. Linear
stability analysis | 12 pages, 1 figure, minor changes, to appear in Classical and Quantum
Gravity | Class.Quant.Grav.26:015010,2009 | 10.1088/0264-9381/26/1/015010 | UMSNH-IFM-F-2008-18 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the linear stability of static, spherically symmetric wormhole
solutions of Einstein's field equations coupled to a massless ghost scalar
field. These solutions are parametrized by the areal radius of their throat and
the product of the masses at their asymptotically flat ends. We prove that all
these solu... | [
{
"created": "Tue, 3 Jun 2008 18:47:37 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Nov 2008 05:15:23 GMT",
"version": "v2"
}
] | 2008-12-25 | [
[
"Gonzalez",
"J. A.",
""
],
[
"Guzman",
"F. S.",
""
],
[
"Sarbach",
"O.",
""
]
] | We examine the linear stability of static, spherically symmetric wormhole solutions of Einstein's field equations coupled to a massless ghost scalar field. These solutions are parametrized by the areal radius of their throat and the product of the masses at their asymptotically flat ends. We prove that all these soluti... |
2202.09641 | Naoki Tsukamoto | Naoki Tsukamoto | Retrolensing by two photon spheres of a black-bounce spacetime | 15 pages, 8 figures, minor changes, changed to one column, added
references, accepted for publication in Physical Review D | Phys. Rev. D 105, 084036 (2022) | 10.1103/PhysRevD.105.084036 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We investigate retrolensing by two photon spheres in a novel black-bounce
spacetime suggested by Lobo et al. which can correspond to a Schwarzschild
black hole, a regular black hole, and a traversable wormhole including an
Ellis-Bronnikov wormhole. In a case, the wormhole has a throat which acts as a
photon sphere an... | [
{
"created": "Sat, 19 Feb 2022 16:58:07 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Apr 2022 00:37:33 GMT",
"version": "v2"
}
] | 2022-04-22 | [
[
"Tsukamoto",
"Naoki",
""
]
] | We investigate retrolensing by two photon spheres in a novel black-bounce spacetime suggested by Lobo et al. which can correspond to a Schwarzschild black hole, a regular black hole, and a traversable wormhole including an Ellis-Bronnikov wormhole. In a case, the wormhole has a throat which acts as a photon sphere and ... |
gr-qc/9306030 | Charles Torre | C. G. Torre | Gravitational Observables and Local Symmetries | 10 pages | Phys.Rev.D48:2373-2376,1993 | 10.1103/PhysRevD.48.R2373 | FTG-116-USU | gr-qc hep-th | null | Using a recent classification of local symmetries of the vacuum Einstein
equations, it is shown that there can be no observables for the vacuum
gravitational field (in a closed universe) built as spatial integrals of local
functions of Cauchy data and their derivatives.
| [
{
"created": "Thu, 24 Jun 1993 17:08:12 GMT",
"version": "v1"
}
] | 2010-01-06 | [
[
"Torre",
"C. G.",
""
]
] | Using a recent classification of local symmetries of the vacuum Einstein equations, it is shown that there can be no observables for the vacuum gravitational field (in a closed universe) built as spatial integrals of local functions of Cauchy data and their derivatives. |
1806.10508 | Jiun-Huei Proty Wu | Wen-Hsuan Lucky Chang and Jiun-Huei Proty Wu | New Approach to Evolving Gravitational Waves in Loop Quantum Cosmology | 17 pages, 9 figures | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With the observational advance in recent years, primordial gravitational
waves (GWs), known as the tensor-mode cosmic perturbations, in the Loop Quantum
Cosmology (LQC) are becoming testable and thus require better framework through
which to bridge between the observations and the theories. In this work we
present a ... | [
{
"created": "Wed, 27 Jun 2018 14:47:22 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Jul 2018 15:47:16 GMT",
"version": "v2"
},
{
"created": "Sun, 9 Jun 2019 18:40:24 GMT",
"version": "v3"
}
] | 2019-06-11 | [
[
"Chang",
"Wen-Hsuan Lucky",
""
],
[
"Wu",
"Jiun-Huei Proty",
""
]
] | With the observational advance in recent years, primordial gravitational waves (GWs), known as the tensor-mode cosmic perturbations, in the Loop Quantum Cosmology (LQC) are becoming testable and thus require better framework through which to bridge between the observations and the theories. In this work we present a ne... |
1203.2306 | Jos\'e A. Zapata | Jose A. Zapata | Local gauge theory and coarse graining | Based on talk given at Loops 11-Madrid | null | 10.1088/1742-6596/360/1/012054 | null | gr-qc hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the discrete gauge theory which is the basis of spin foam models, the
problem of macroscopically faithful coarse graining is studied. Macroscopic
data is identified; it contains the holonomy evaluation along a discrete set of
loops and the homotopy classes of certain maps. When two configurations share
this da... | [
{
"created": "Sun, 11 Mar 2012 03:09:59 GMT",
"version": "v1"
}
] | 2015-06-04 | [
[
"Zapata",
"Jose A.",
""
]
] | Within the discrete gauge theory which is the basis of spin foam models, the problem of macroscopically faithful coarse graining is studied. Macroscopic data is identified; it contains the holonomy evaluation along a discrete set of loops and the homotopy classes of certain maps. When two configurations share this data... |
0707.0669 | Jose Edgar Madriz Aguilar | Lucio Fabio P. da Silva and Jose Edgar Madriz Aguilar | Quintessential inflation from 5D warped product spaces on a dynamical
foliation | 7 pages, 1 figure Accepted for publication in Modern Physics Letters
A | Mod.Phys.Lett.A23:1213-1221,2008 | 10.1142/S0217732308025747 | null | gr-qc astro-ph hep-th | null | Assuming the existence of a 5D purely kinetic scalar field on the class of
warped product spaces we investigate the possibility of mimic both an
inflationary and a quintessential scenarios on 4D hypersurfaces, by
implementing a dynamical foliation on the fifth coordinate instead of a
constant one. We obtain that an i... | [
{
"created": "Wed, 4 Jul 2007 17:26:25 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Sep 2007 20:18:51 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"da Silva",
"Lucio Fabio P.",
""
],
[
"Aguilar",
"Jose Edgar Madriz",
""
]
] | Assuming the existence of a 5D purely kinetic scalar field on the class of warped product spaces we investigate the possibility of mimic both an inflationary and a quintessential scenarios on 4D hypersurfaces, by implementing a dynamical foliation on the fifth coordinate instead of a constant one. We obtain that an ind... |
1806.00126 | Cosimo Bambi | Jingyi Wang, Askar B. Abdikamalov, Dimitry Ayzenberg, Cosimo Bambi,
Thomas Dauser, Javier A. Garcia, Sourabh Nampalliwar, James F. Steiner | Testing the Kerr metric using X-ray reflection spectroscopy: spectral
analysis of GX 339-4 | 2+26 pages, 11 figures. v3: refereed version | JCAP 2005:026 (2020) | 10.1088/1475-7516/2020/05/026 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Signatures of X-ray reprocessing (reflection) out of an accretion disk are
commonly observed in the high-energy spectrum of accreting black holes, and can
be used to probe the strong gravity region around these objects. In this paper,
we extend previous work in the literature and we employ a full emission model
for r... | [
{
"created": "Thu, 31 May 2018 23:02:19 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jun 2019 05:57:07 GMT",
"version": "v2"
},
{
"created": "Wed, 13 May 2020 15:40:51 GMT",
"version": "v3"
}
] | 2020-05-14 | [
[
"Wang",
"Jingyi",
""
],
[
"Abdikamalov",
"Askar B.",
""
],
[
"Ayzenberg",
"Dimitry",
""
],
[
"Bambi",
"Cosimo",
""
],
[
"Dauser",
"Thomas",
""
],
[
"Garcia",
"Javier A.",
""
],
[
"Nampalliwar",
"Sourabh",
"... | Signatures of X-ray reprocessing (reflection) out of an accretion disk are commonly observed in the high-energy spectrum of accreting black holes, and can be used to probe the strong gravity region around these objects. In this paper, we extend previous work in the literature and we employ a full emission model for rel... |
gr-qc/0507126 | Filimonova Irina V | V.V.Kiselev | Ghost condensate model of flat rotation curves | Plenary talk presented at Workshop on High Energy Physics&Field
Theory (Protvino, Russia, 2004) | null | null | HEPFT/2004/7 | gr-qc | null | An effective action of ghost condensate with higher derivatives creates a
source of gravity and mimics a dark matter in spiral galaxies. We present a
spherically symmetric static solution of Einstein--Hilbert equations with the
ghost condensate at large distances, where flat rotation curves are reproduced
in leading ... | [
{
"created": "Fri, 29 Jul 2005 06:59:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kiselev",
"V. V.",
""
]
] | An effective action of ghost condensate with higher derivatives creates a source of gravity and mimics a dark matter in spiral galaxies. We present a spherically symmetric static solution of Einstein--Hilbert equations with the ghost condensate at large distances, where flat rotation curves are reproduced in leading or... |
2407.01932 | Tayyab Naseer | M. Sharif, T. Naseer | Study of Anisotropic Compact Stars in
$f(\mathcal{R},\mathcal{T},\mathcal{R}_{\chi\xi}\mathcal{T}^{\chi\xi})$
Gravity | 28 pages, 8 figures | Pramana 96(2022)119 | 10.1007/s12043-022-02357-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper aims to examine the composition of various spherically symmetric
star models which are coupled with anisotropic configuration in
$f(\mathcal{R},\mathcal{T},\mathcal{Q})$ gravity, where
$\mathcal{Q}=\mathcal{R}_{\chi\xi}\mathcal{T}^{\chi\xi}$. We discuss the
physical features of compact objects by employing... | [
{
"created": "Tue, 2 Jul 2024 03:56:35 GMT",
"version": "v1"
}
] | 2024-07-03 | [
[
"Sharif",
"M.",
""
],
[
"Naseer",
"T.",
""
]
] | This paper aims to examine the composition of various spherically symmetric star models which are coupled with anisotropic configuration in $f(\mathcal{R},\mathcal{T},\mathcal{Q})$ gravity, where $\mathcal{Q}=\mathcal{R}_{\chi\xi}\mathcal{T}^{\chi\xi}$. We discuss the physical features of compact objects by employing b... |
1810.05177 | Helvi Witek | Helvi Witek, Leonardo Gualtieri, Paolo Pani and Thomas P. Sotiriou | Black holes and binary mergers in scalar Gauss-Bonnet gravity: scalar
field dynamics | 24 pages; 12 figures; Numerical code based on the Einstein Toolkit
with new thorns available at https://bitbucket.org/canuda/. v2: updated
references and discussion | Phys. Rev. D 99, 064035 (2019) | 10.1103/PhysRevD.99.064035 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the nonlinear dynamics of black holes that carry scalar hair and
binaries composed of such black holes. The scalar hair is due to a linear or
exponential coupling between the scalar and the Gauss--Bonnet invariant. We
work perturbatively in the coupling constant of that interaction but
nonperturbatively in t... | [
{
"created": "Thu, 11 Oct 2018 18:00:25 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Nov 2018 11:22:53 GMT",
"version": "v2"
}
] | 2019-04-03 | [
[
"Witek",
"Helvi",
""
],
[
"Gualtieri",
"Leonardo",
""
],
[
"Pani",
"Paolo",
""
],
[
"Sotiriou",
"Thomas P.",
""
]
] | We study the nonlinear dynamics of black holes that carry scalar hair and binaries composed of such black holes. The scalar hair is due to a linear or exponential coupling between the scalar and the Gauss--Bonnet invariant. We work perturbatively in the coupling constant of that interaction but nonperturbatively in the... |
2207.08688 | Achilles D. Speliotopoulos | Achilles D. Speliotopoulos | Dark Energy and Extending the Geodesic Equations of Motion: A Spectrum
of Galactic Rotation Curves | 39 pages, 5 figures. To appear in General Relativity and Gravitation | null | 10.1007/s10714-022-02949-w | null | gr-qc astro-ph.CO astro-ph.GA hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | A recently proposed extension of the geodesic equations of motion, where the
worldline traced by a test particle now depends on the scalar curvature, is
used to study the formation of galaxies and galactic rotation curves. This
extension is applied to the motion of a fluid in a spherical geometry,
resulting in a set ... | [
{
"created": "Mon, 18 Jul 2022 15:38:25 GMT",
"version": "v1"
}
] | 2022-07-27 | [
[
"Speliotopoulos",
"Achilles D.",
""
]
] | A recently proposed extension of the geodesic equations of motion, where the worldline traced by a test particle now depends on the scalar curvature, is used to study the formation of galaxies and galactic rotation curves. This extension is applied to the motion of a fluid in a spherical geometry, resulting in a set of... |
2001.03980 | Maciej Maliborski | Piotr Bizo\'n, Dominika Hunik-Kostyra, Maciej Maliborski | AdS Robin solitons and their stability | 13 pages, 2 figures | null | 10.1088/1361-6382/ab7ee4 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the four-dimensional Einstein-Klein-Gordon-AdS system with
conformal mass subject to the Robin boundary conditions at infinity. Above a
critical value of the Robin parameter, at which the AdS spacetime goes linearly
unstable, we prove existence of a family of globally regular static solutions
(that we cal... | [
{
"created": "Sun, 12 Jan 2020 19:11:18 GMT",
"version": "v1"
}
] | 2020-06-17 | [
[
"Bizoń",
"Piotr",
""
],
[
"Hunik-Kostyra",
"Dominika",
""
],
[
"Maliborski",
"Maciej",
""
]
] | We consider the four-dimensional Einstein-Klein-Gordon-AdS system with conformal mass subject to the Robin boundary conditions at infinity. Above a critical value of the Robin parameter, at which the AdS spacetime goes linearly unstable, we prove existence of a family of globally regular static solutions (that we call ... |
gr-qc/0508055 | Willians Barreto | W. Barreto and A. Da Silva | Self-similar and charged spheres in the diffusion approximation | 15 pages, 7 figures | Class. and Quantum Grav. 16, 1783 (1999) | 10.1088/0264-9381/16/6/312 | null | gr-qc | null | We study spherical, charged and self--similar distributions of matter in the
diffusion approximation. We propose a simple, dynamic but physically meaningful
solution. For such a solution we obtain a model in which the distribution
becomes static and changes to dust. The collapse is halted with damped mass
oscillation... | [
{
"created": "Fri, 12 Aug 2005 21:37:12 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Barreto",
"W.",
""
],
[
"Da Silva",
"A.",
""
]
] | We study spherical, charged and self--similar distributions of matter in the diffusion approximation. We propose a simple, dynamic but physically meaningful solution. For such a solution we obtain a model in which the distribution becomes static and changes to dust. The collapse is halted with damped mass oscillations ... |
1207.0579 | C. Q. Geng | Huan-Hsin Tseng, Chung-Chi Lee and Chao-Qiang Geng | Scalar-Torsion Mode in a Cosmological Model of the Poincar\'{e} Gauge
Theory of Gravity | 12 pages, 2 figures, title changed, revised version accepted for
publication in JCAP | null | 10.1088/1475-7516/2012/11/013 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the equation of state (EoS) of the scalar-torsion mode in
Poincar\'{e} gauge theory of gravity. We concentrate on two cases with the
constant curvature solution and positive kinetic energy, respectively. In the
former, we find that the torsion EoS has different values in the various stages
of the unive... | [
{
"created": "Tue, 3 Jul 2012 06:31:33 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Oct 2012 03:09:58 GMT",
"version": "v2"
}
] | 2015-06-05 | [
[
"Tseng",
"Huan-Hsin",
""
],
[
"Lee",
"Chung-Chi",
""
],
[
"Geng",
"Chao-Qiang",
""
]
] | We investigate the equation of state (EoS) of the scalar-torsion mode in Poincar\'{e} gauge theory of gravity. We concentrate on two cases with the constant curvature solution and positive kinetic energy, respectively. In the former, we find that the torsion EoS has different values in the various stages of the univers... |
gr-qc/0205057 | Pedro Gonzalez | Pedro F. Gonzalez-Diaz (IMAFF, CSIC, Madrid) | Can black holes exist in an accelerating universe? | 14 pages, LaTex | null | null | IMAFF-RCA-02-05 | gr-qc | null | This letter deals with an analysis of the space-time static metric that
corresponds to a quintessential state equation with constant characteristic
parameter. Following a procedure parallel to as it is used in the case of de
Sitter space, we have tried to generalize the metric components that correspond
to the quinte... | [
{
"created": "Wed, 15 May 2002 15:29:34 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gonzalez-Diaz",
"Pedro F.",
"",
"IMAFF, CSIC, Madrid"
]
] | This letter deals with an analysis of the space-time static metric that corresponds to a quintessential state equation with constant characteristic parameter. Following a procedure parallel to as it is used in the case of de Sitter space, we have tried to generalize the metric components that correspond to the quintess... |
gr-qc/0306017 | Mario La Camera | M. La Camera | Wormhole solutions in the Randall-Sundrum scenario | 10 pages, 2 figures, revtex4 | Phys.Lett. B573 (2003) 27-32 | 10.1016/j.physletb.2003.08.042 | null | gr-qc | null | In the simplest form of the Randall-Sundrum model, we consider the metric
generated by a static, spherically symmetric distribution of matter on the
physical brane. The solution to the five-dimensional Einstein equations,
obtained numerically, describes a wormhole geometry.
| [
{
"created": "Wed, 4 Jun 2003 13:58:37 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"La Camera",
"M.",
""
]
] | In the simplest form of the Randall-Sundrum model, we consider the metric generated by a static, spherically symmetric distribution of matter on the physical brane. The solution to the five-dimensional Einstein equations, obtained numerically, describes a wormhole geometry. |
2301.04674 | \'Alvaro Parra L\'opez | Jose A. R. Cembranos, Luis J. Garay, \'Alvaro Parra-L\'opez and Jose
M. S\'anchez Vel\'azquez | Late vacuum choice and slow roll approximation in gravitational particle
production during reheating | 24 pages, 11 figures | JCAP08(2023)060 | 10.1088/1475-7516/2023/08/060 | IPARCOS-UCM-23-002, IFT-UAM/CSIC-23-4 | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the transition between inflation and reheating, the curvature scalar
typically undergoes oscillations which have significant impact on the density
of gravitationally produced particles. The commonly used adiabatic vacuum
prescription for the extraction of produced particle spectra becomes a
non-reliable definition... | [
{
"created": "Wed, 11 Jan 2023 19:01:02 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Mar 2023 14:14:17 GMT",
"version": "v2"
},
{
"created": "Tue, 29 Aug 2023 08:07:59 GMT",
"version": "v3"
}
] | 2024-01-25 | [
[
"Cembranos",
"Jose A. R.",
""
],
[
"Garay",
"Luis J.",
""
],
[
"Parra-López",
"Álvaro",
""
],
[
"Velázquez",
"Jose M. Sánchez",
""
]
] | In the transition between inflation and reheating, the curvature scalar typically undergoes oscillations which have significant impact on the density of gravitationally produced particles. The commonly used adiabatic vacuum prescription for the extraction of produced particle spectra becomes a non-reliable definition o... |
1003.0868 | Isabel Cordero-Carri\'on | Isabel Cordero-Carri\'on, Pablo Cerd\'a-Dur\'an and Jos\'e Mar\'ia
Ib\'a\~nez | Dynamical spacetimes and gravitational radiation in a Fully Constrained
Formulation | 4 pages, 7 figures. Accepted for publication in Journal of Physics:
Conference Series, Proceedings of the 8th Edoardo Amaldi Conference on
Gravitational Waves | J.Phys.Conf.Ser.228:012055,2010 | 10.1088/1742-6596/228/1/012055 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This contribution summarizes the recent work carried out to analyze the
behavior of the hyperbolic sector of the Fully Constrained Formulation (FCF)
derived in Bonazzola et al. 2004. The numerical experiments presented here
allows one to be confident in the performances of the upgraded version of
CoCoNuT's code by re... | [
{
"created": "Wed, 3 Mar 2010 17:37:11 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Cordero-Carrión",
"Isabel",
""
],
[
"Cerdá-Durán",
"Pablo",
""
],
[
"Ibáñez",
"José María",
""
]
] | This contribution summarizes the recent work carried out to analyze the behavior of the hyperbolic sector of the Fully Constrained Formulation (FCF) derived in Bonazzola et al. 2004. The numerical experiments presented here allows one to be confident in the performances of the upgraded version of CoCoNuT's code by repl... |
2012.06835 | Sayantani Lahiri | Sayantani Lahiri, Sergio Gimeno-Soler, Jos\'e A. Font, and Alejandro
Mus Mej\'ias | Stationary models of magnetized viscous tori around a Schwarzschild
black hole | 14 pages, 7 figures, some comments and references are added, version
accepted for publication in PRD | Phys. Rev. D 103, 044034 (2021) | 10.1103/PhysRevD.103.044034 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present stationary solutions of magnetized, viscous thick accretion disks
around a Schwarzschild black hole. We assume that the tori are not
self-gravitating, are endowed with a toroidal magnetic field, and obey a
constant angular momentum law. Our study focuses on the role of the black hole
curvature in the shear... | [
{
"created": "Sat, 12 Dec 2020 15:10:56 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Dec 2020 23:02:51 GMT",
"version": "v2"
},
{
"created": "Tue, 19 Jan 2021 17:27:00 GMT",
"version": "v3"
}
] | 2021-02-24 | [
[
"Lahiri",
"Sayantani",
""
],
[
"Gimeno-Soler",
"Sergio",
""
],
[
"Font",
"José A.",
""
],
[
"Mejías",
"Alejandro Mus",
""
]
] | We present stationary solutions of magnetized, viscous thick accretion disks around a Schwarzschild black hole. We assume that the tori are not self-gravitating, are endowed with a toroidal magnetic field, and obey a constant angular momentum law. Our study focuses on the role of the black hole curvature in the shear v... |
1705.05771 | Willians Barreto | W. Barreto, H. P. de Oliveira and E. L. Rodrigues | Nonlinear interaction between electromagnetic and gravitational waves:
an appraisal | 5 pages, 3 figures, awarded honorable mention in the Gravity Research
Foundation 2017 essay competition | Int. J. Mod. Phys. D 26 (12) 1743017 (2017) | 10.1142/S0218271817430179 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Wave propagation of field disturbances is ubiquitous. The electromagnetic and
gravitational are cousin theories in which the corresponding waves play a
relevant role to understand several related physical. It has been established
that small electromagnetic waves can generate gravitational waves and vice
versa when sc... | [
{
"created": "Tue, 16 May 2017 15:38:02 GMT",
"version": "v1"
}
] | 2017-11-22 | [
[
"Barreto",
"W.",
""
],
[
"de Oliveira",
"H. P.",
""
],
[
"Rodrigues",
"E. L.",
""
]
] | Wave propagation of field disturbances is ubiquitous. The electromagnetic and gravitational are cousin theories in which the corresponding waves play a relevant role to understand several related physical. It has been established that small electromagnetic waves can generate gravitational waves and vice versa when scat... |
1812.06085 | Yongwan Gim | Yongwan Gim, Wontae Kim | The role of the cosmological constant as a pressure in the
(2+1)-dimensional black string | 15 pages, version to appear in PLB | Phys. Lett. B791, 390 (2019) | 10.1016/j.physletb.2019.03.014 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been claimed that the cosmological constant in AdS black holes such as
the BTZ black hole plays the role of the thermodynamic variable of a pressure
in the thermodynamic first law and the Smarr relation from the scaling law of
the Christodoulou-Ruffini formula. However, the dual solution of the BTZ black
hole ... | [
{
"created": "Fri, 14 Dec 2018 05:13:12 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Mar 2019 01:55:55 GMT",
"version": "v2"
}
] | 2019-03-21 | [
[
"Gim",
"Yongwan",
""
],
[
"Kim",
"Wontae",
""
]
] | It has been claimed that the cosmological constant in AdS black holes such as the BTZ black hole plays the role of the thermodynamic variable of a pressure in the thermodynamic first law and the Smarr relation from the scaling law of the Christodoulou-Ruffini formula. However, the dual solution of the BTZ black hole is... |
2310.12668 | Julio Arrechea | Julio Arrechea, Carlos Barcel\'o, Ra\'ul Carballo-Rubio, Luis J. Garay | Ultracompact horizonless objects in order-reduced semiclassical gravity | 15 pages, 5 figures. Added a new figure, an appendix, and improved
the main text. To appear in Phys. Rev. D | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The backreaction of quantum fields in their vacuum state results in
equilibrium structures that surpass the Buchdahl compactness limit. Such
backreaction is encapsulated in the vacuum expectation value of the
renormalized stress-energy tensor (RSET). In previous works we presented
analytic approximations to the RSET,... | [
{
"created": "Thu, 19 Oct 2023 11:56:47 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Apr 2024 12:39:59 GMT",
"version": "v2"
}
] | 2024-04-23 | [
[
"Arrechea",
"Julio",
""
],
[
"Barceló",
"Carlos",
""
],
[
"Carballo-Rubio",
"Raúl",
""
],
[
"Garay",
"Luis J.",
""
]
] | The backreaction of quantum fields in their vacuum state results in equilibrium structures that surpass the Buchdahl compactness limit. Such backreaction is encapsulated in the vacuum expectation value of the renormalized stress-energy tensor (RSET). In previous works we presented analytic approximations to the RSET, o... |
1103.1428 | Marko Vojinovic | Aleksandar Mikovic and Marko Vojinovic | Graviton propagator asymptotics and the classical limit of ELPR/FK spin
foam models | v3: major review, lot of modifications, including interpretation of
results | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the classical limit of the ELPR/FK spin foam models by analyzing the
large-distance asymptotics of the corresponding graviton propagators. This is
done by examining the large-spin asymptotics of the Hartle-Hawking wavefunction
which is peaked around a classical flat spatial geometry. By using the
stationary ... | [
{
"created": "Tue, 8 Mar 2011 03:50:25 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Mar 2011 16:02:50 GMT",
"version": "v2"
},
{
"created": "Mon, 20 Jun 2011 23:51:34 GMT",
"version": "v3"
}
] | 2011-06-22 | [
[
"Mikovic",
"Aleksandar",
""
],
[
"Vojinovic",
"Marko",
""
]
] | We study the classical limit of the ELPR/FK spin foam models by analyzing the large-distance asymptotics of the corresponding graviton propagators. This is done by examining the large-spin asymptotics of the Hartle-Hawking wavefunction which is peaked around a classical flat spatial geometry. By using the stationary ph... |
1306.5853 | Kourosh Nozari | Kourosh Nozari and Narges Rshidi | Some Aspects of Tachyon Field Cosmology | 33 pages, 25 figures, Accepted for publication in Phys. Rev. D | Phys. Rev. D 88, 023519 (2013) | 10.1103/PhysRevD.88.023519 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study inflation, perturbations, non-gaussinity and late-time cosmological
dynamics of a tachyon field both minimally and non-minimally coupled to
gravity. By analyzing the parameters space of the model, the viability of the
model in confrontation with recent observational data is considered. In a
dynamical system ... | [
{
"created": "Tue, 25 Jun 2013 06:27:05 GMT",
"version": "v1"
}
] | 2015-06-16 | [
[
"Nozari",
"Kourosh",
""
],
[
"Rshidi",
"Narges",
""
]
] | We study inflation, perturbations, non-gaussinity and late-time cosmological dynamics of a tachyon field both minimally and non-minimally coupled to gravity. By analyzing the parameters space of the model, the viability of the model in confrontation with recent observational data is considered. In a dynamical system te... |
gr-qc/0403091 | Henrique P. de Oliveira | H. P. de Oliveira (UERJ) and I. Dami\~ao Soares (CBPF) | Gravitational Wave Emission from a Bounded Source: the Nonlinear Regime | 3 page, 1 figure, proceedings of the X Marcel Grossmann Meeting 22-26
July, 2003, Rio de Janeiro | Phys.Rev. D70 (2004) 084041 | 10.1103/PhysRevD.70.084041 | null | gr-qc | null | We study the dynamics of a bounded gravitational collapsing configuration
emitting gravitational waves, where the exterior spacetime is described by
Robinson-Trautman geometries. The full nonlinear regime is examined by using
the Galerkin method that allows us to reduce the equations governing the
dynamics to a finit... | [
{
"created": "Mon, 22 Mar 2004 15:25:30 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"de Oliveira",
"H. P.",
"",
"UERJ"
],
[
"Soares",
"I. Damião",
"",
"CBPF"
]
] | We study the dynamics of a bounded gravitational collapsing configuration emitting gravitational waves, where the exterior spacetime is described by Robinson-Trautman geometries. The full nonlinear regime is examined by using the Galerkin method that allows us to reduce the equations governing the dynamics to a finite-... |
2205.01597 | Philippe Jetzer | K. G. Arun, Enis Belgacem, Robert Benkel, Laura Bernard, Emanuele
Berti, Gianfranco Bertone, Marc Besancon, Diego Blas, Christian G. B\"ohmer,
Richard Brito, Gianluca Calcagni, Alejandro Cardenas-Avenda\~no, Katy Clough,
Marco Crisostomi, Valerio De Luca, Daniela Doneva, Stephanie Escoffier, Jose
Maria Ezquiaga... | New Horizons for Fundamental Physics with LISA | Accepted in: Living Reviews in Relativity | null | 10.1007/s41114-022-00036-9 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The Laser Interferometer Space Antenna (LISA) has the potential to reveal
wonders about the fundamental theory of nature at play in the extreme gravity
regime, where the gravitational interaction is both strong and dynamical. In
this white paper, the Fundamental Physics Working Group of the LISA Consortium
summarizes... | [
{
"created": "Tue, 3 May 2022 16:20:16 GMT",
"version": "v1"
}
] | 2022-07-20 | [
[
"Arun",
"K. G.",
""
],
[
"Belgacem",
"Enis",
""
],
[
"Benkel",
"Robert",
""
],
[
"Bernard",
"Laura",
""
],
[
"Berti",
"Emanuele",
""
],
[
"Bertone",
"Gianfranco",
""
],
[
"Besancon",
"Marc",
""
],
[
... | The Laser Interferometer Space Antenna (LISA) has the potential to reveal wonders about the fundamental theory of nature at play in the extreme gravity regime, where the gravitational interaction is both strong and dynamical. In this white paper, the Fundamental Physics Working Group of the LISA Consortium summarizes t... |
gr-qc/0105106 | Hans-Juergen Schmidt | H.-J. Schmidt | Surface Layers in General Relativity and Their Relation to Surface
Tensions | 12 pages, LaTeX, no figure | Gen.Rel.Grav.16:1053-1061,1984 | 10.1007/BF00760644 | UNIPO-MATH-01-May-22 | gr-qc | null | For a thin shell, the intrinsic 3-pressure will be shown to be analogous to
-A, where A is the classical surface tension: First, interior and exterior
Schwarzschild solutions will be matched together such that the surface layer
generated at the common boundary has no gravitational mass; then its intrinsic
3-pressure ... | [
{
"created": "Mon, 28 May 2001 07:35:07 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Schmidt",
"H. -J.",
""
]
] | For a thin shell, the intrinsic 3-pressure will be shown to be analogous to -A, where A is the classical surface tension: First, interior and exterior Schwarzschild solutions will be matched together such that the surface layer generated at the common boundary has no gravitational mass; then its intrinsic 3-pressure re... |
1807.07424 | Sohrab Rahvar | S. Rahvar and J. W. Moffat | Propagation of Electromagnetic Waves in MOG: Gravitational Lensing | 6 pages, 1 figure, accepted in MNRAS | null | 10.1093/mnras/sty3002 | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the solution of Maxwell's equations in curved spacetime within
the framework of Modified Gravity (MOG). We show that besides the null-geodesic
treatment of photons in MOG, using Maxwell's equations and covariant coupling
with the extra vector sector of gravitation in MOG, we can extract the equation
fo... | [
{
"created": "Tue, 17 Jul 2018 19:43:25 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Aug 2018 02:20:49 GMT",
"version": "v2"
},
{
"created": "Tue, 30 Oct 2018 10:54:19 GMT",
"version": "v3"
}
] | 2018-11-14 | [
[
"Rahvar",
"S.",
""
],
[
"Moffat",
"J. W.",
""
]
] | We investigate the solution of Maxwell's equations in curved spacetime within the framework of Modified Gravity (MOG). We show that besides the null-geodesic treatment of photons in MOG, using Maxwell's equations and covariant coupling with the extra vector sector of gravitation in MOG, we can extract the equation for ... |
1003.3483 | Francesca Vidotto | Eugenio Bianchi, Carlo Rovelli and Francesca Vidotto | Towards Spinfoam Cosmology | 8 pages | Phys.Rev.D82:084035,2010 | 10.1103/PhysRevD.82.084035 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the transition amplitude between coherent quantum-states of
geometry peaked on homogeneous isotropic metrics. We use the holomorphic
representations of loop quantum gravity and the
Kaminski-Kisielowski-Lewandowski generalization of the new vertex, and work at
first order in the vertex expansion, second ord... | [
{
"created": "Wed, 17 Mar 2010 21:41:21 GMT",
"version": "v1"
}
] | 2010-10-27 | [
[
"Bianchi",
"Eugenio",
""
],
[
"Rovelli",
"Carlo",
""
],
[
"Vidotto",
"Francesca",
""
]
] | We compute the transition amplitude between coherent quantum-states of geometry peaked on homogeneous isotropic metrics. We use the holomorphic representations of loop quantum gravity and the Kaminski-Kisielowski-Lewandowski generalization of the new vertex, and work at first order in the vertex expansion, second order... |
1205.4666 | Carlos A. Batista da S. Filho | Carlos Batista | A Generalization of the Goldberg-Sachs Theorem and its Consequences | 14 pages. This version matches the published one | Gen. Relativ. Gravit. 45 (2013), 1411 | 10.1007/s10714-013-1539-4 | null | gr-qc hep-th math.DG | http://creativecommons.org/licenses/by/3.0/ | The Goldberg-Sachs theorem is generalized for all four-dimensional manifolds
endowed with torsion-free connection compatible with the metric, the treatment
includes all signatures as well as complex manifolds. It is shown that when the
Weyl tensor is algebraically special severe geometric restrictions are imposed.
In... | [
{
"created": "Mon, 21 May 2012 18:08:23 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Apr 2013 19:22:52 GMT",
"version": "v2"
}
] | 2013-06-11 | [
[
"Batista",
"Carlos",
""
]
] | The Goldberg-Sachs theorem is generalized for all four-dimensional manifolds endowed with torsion-free connection compatible with the metric, the treatment includes all signatures as well as complex manifolds. It is shown that when the Weyl tensor is algebraically special severe geometric restrictions are imposed. In p... |
gr-qc/0305078 | Dr Mayeul Arminjon | Mayeul Arminjon | Testing a theory of gravity in celestial mechanics: a new method and its
first results for a scalar theory | v2: links to quoted arXiv papers. LaTeX, 28 pages including 2
figures. This is a revised version of a lecture given at the 8th. Conf.
``Physical Interpretations of Relativity Theory'' (London, September 2002),
organized by the British Society for the Philosophy of Sciences. The initial
version will appear in th... | RecentRes.Dev.Astron.Astrophys.1:859-879,2003 | null | null | gr-qc astro-ph | null | A new method of post-Newtonian approximation (PNA) for weak gravitational
fields is presented together with its application to test an alternative,
scalar theory of gravitation. The new method consists in defining a
one-parameter family of systems, by applying a Newtonian similarity
transformation to the initial data... | [
{
"created": "Wed, 21 May 2003 15:15:26 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Jun 2003 13:38:04 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Arminjon",
"Mayeul",
""
]
] | A new method of post-Newtonian approximation (PNA) for weak gravitational fields is presented together with its application to test an alternative, scalar theory of gravitation. The new method consists in defining a one-parameter family of systems, by applying a Newtonian similarity transformation to the initial data t... |
1707.05763 | Maurizio Gasperini | M. Gasperini | On the initial regime of pre-big bang cosmology | 9 pages, no figures, a few typos corrected. Published in JCAP 09
(2017) 001 | JCAP 09 (2017) 001 | 10.1088/1475-7516/2017/09/001 | BA-TH/712-17 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The production of a background of super-horizon curvature perturbations with
the appropriate (red) spectrum needed to trigger the cosmic anisotropies
observed on large scales is associated, in the context of pre-big bang
inflation, with a phase of growing string coupling. The extension towards the
past of such a phas... | [
{
"created": "Tue, 18 Jul 2017 17:47:16 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Sep 2017 20:57:49 GMT",
"version": "v2"
},
{
"created": "Thu, 7 Sep 2017 16:11:48 GMT",
"version": "v3"
}
] | 2017-09-08 | [
[
"Gasperini",
"M.",
""
]
] | The production of a background of super-horizon curvature perturbations with the appropriate (red) spectrum needed to trigger the cosmic anisotropies observed on large scales is associated, in the context of pre-big bang inflation, with a phase of growing string coupling. The extension towards the past of such a phase ... |
2307.04743 | Philip Klaus Schwartz | Ashkan Alibabaei, Philip K. Schwartz, Domenico Giulini | Geometric post-Newtonian description of massive spin-half particles in
curved spacetime | 22+3+13 pages (main text, references, appendix), to appear in
Classical and Quantum Gravity. v2: corrected author spelling in arXiv
metadata. v3: added references, extended introductory discussion, corrected
typos | Classical and Quantum Gravity 40, 235014 (2023) | 10.1088/1361-6382/ad079c | null | gr-qc physics.atom-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the Dirac equation coupled to an external electromagnetic field
in curved four-dimensional spacetime with a given timelike worldline $\gamma$
representing a classical clock. We use generalised Fermi normal coordinates in
a tubular neighbourhood of $\gamma$ and expand the Dirac equation up to, and
includin... | [
{
"created": "Mon, 10 Jul 2023 17:53:19 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Jul 2023 08:36:01 GMT",
"version": "v2"
},
{
"created": "Sun, 29 Oct 2023 12:49:36 GMT",
"version": "v3"
}
] | 2023-11-27 | [
[
"Alibabaei",
"Ashkan",
""
],
[
"Schwartz",
"Philip K.",
""
],
[
"Giulini",
"Domenico",
""
]
] | We consider the Dirac equation coupled to an external electromagnetic field in curved four-dimensional spacetime with a given timelike worldline $\gamma$ representing a classical clock. We use generalised Fermi normal coordinates in a tubular neighbourhood of $\gamma$ and expand the Dirac equation up to, and including,... |
0708.0525 | Giampiero Esposito Dr. | Alfio Bonanno, Giampiero Esposito, Claudio Rubano, Paolo Scudellaro | Noether symmetry approach to scalar-field-dominated cosmology with
dynamically evolving G and Lambda | 10 pages, Revtex4 | Int.J.Geom.Meth.Mod.Phys.5:329-337,2008 | 10.1142/S0219887808002801 | null | gr-qc | null | This paper studies the cosmological equations for a scalar field Phi in the
framework of a quantum gravity modified Einstein--Hilbert Lagrangian where G
and Lambda are dynamical variables. It is possible to show that there exists a
Noether symmetry for the point Lagrangian describing this scheme in a FRW
universe. Ou... | [
{
"created": "Fri, 3 Aug 2007 14:35:37 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bonanno",
"Alfio",
""
],
[
"Esposito",
"Giampiero",
""
],
[
"Rubano",
"Claudio",
""
],
[
"Scudellaro",
"Paolo",
""
]
] | This paper studies the cosmological equations for a scalar field Phi in the framework of a quantum gravity modified Einstein--Hilbert Lagrangian where G and Lambda are dynamical variables. It is possible to show that there exists a Noether symmetry for the point Lagrangian describing this scheme in a FRW universe. Our ... |
2407.11178 | Yi Li | Song He and Yi Li | Spacetime with prescribed hidden symmetry | 9 pages, a few references added | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this paper, we investigate spacetime characterized by a hidden symmetry
defined by a given Killing tensor. To exhibit this hidden symmetry, the inverse
metric must commute with the Killing tensor under the Schouten-Nijenhuis
bracket, which translates into a system of partial differential equations
(PDEs) for the i... | [
{
"created": "Mon, 15 Jul 2024 19:03:13 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Jul 2024 05:00:45 GMT",
"version": "v2"
}
] | 2024-07-24 | [
[
"He",
"Song",
""
],
[
"Li",
"Yi",
""
]
] | In this paper, we investigate spacetime characterized by a hidden symmetry defined by a given Killing tensor. To exhibit this hidden symmetry, the inverse metric must commute with the Killing tensor under the Schouten-Nijenhuis bracket, which translates into a system of partial differential equations (PDEs) for the inv... |
1602.05672 | Tuan Do | Tuan Q. Do | Higher dimensional nonlinear massive gravity | 20 pages, no figure. Some discussions on the
Schwarzschild-Tangherlini-(A)dS black holes and references are added.
Comments are welcome | Phys. Rev. D 93, 104003 (2016) | 10.1103/PhysRevD.93.104003 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inspired by a recent ghost-free nonlinear massive gravity in four-dimensional
spacetime, we study its higher dimensional scenarios. As a result, we are able
to show the constant-like behavior of massive graviton terms for some
well-known metrics such as the Friedmann-Lemaitre-Robertson-Walker, Bianchi
type I, and Sch... | [
{
"created": "Thu, 18 Feb 2016 03:55:37 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Feb 2016 12:53:16 GMT",
"version": "v2"
}
] | 2016-05-04 | [
[
"Do",
"Tuan Q.",
""
]
] | Inspired by a recent ghost-free nonlinear massive gravity in four-dimensional spacetime, we study its higher dimensional scenarios. As a result, we are able to show the constant-like behavior of massive graviton terms for some well-known metrics such as the Friedmann-Lemaitre-Robertson-Walker, Bianchi type I, and Schwa... |
gr-qc/0503035 | Leonardo Fernandez-Jambrina | L. Fernandez-Jambrina | Comment on Singularity-free Cosmological Solutions with Non-rotating
Perfect Fluids | LaTeX, 5 pages | Gen.Rel.Grav. 37 (2005) 421-424 | 10.1007/s10714-005-0030-2 | 2005-1 | gr-qc | null | A conjecture stated by Raychaudhuri which claims that the only physical
perfect fluid non-rotating non-singular cosmological models are comprised in
the Ruiz-Senovilla and Fernandez-Jambrina families is shown to be incorrect. An
explicit counterexample is provided and the failure of the argument leading to
the result... | [
{
"created": "Wed, 9 Mar 2005 12:37:14 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Fernandez-Jambrina",
"L.",
""
]
] | A conjecture stated by Raychaudhuri which claims that the only physical perfect fluid non-rotating non-singular cosmological models are comprised in the Ruiz-Senovilla and Fernandez-Jambrina families is shown to be incorrect. An explicit counterexample is provided and the failure of the argument leading to the result i... |
1705.01845 | Tito Dal Canton | Tito Dal Canton, Ian W. Harry | Designing a template bank to observe compact binary coalescences in
Advanced LIGO's second observing run | 10 pages, 8 figures | null | null | LIGO-P1700085 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe the methodology and novel techniques used to construct a set of
waveforms, or template bank, applicable to searches for compact binary
coalescences in Advanced LIGO's second observing run. This template bank is
suitable for observing systems composed of two neutron stars, two black holes,
or a neutron sta... | [
{
"created": "Thu, 4 May 2017 14:05:58 GMT",
"version": "v1"
}
] | 2017-05-05 | [
[
"Canton",
"Tito Dal",
""
],
[
"Harry",
"Ian W.",
""
]
] | We describe the methodology and novel techniques used to construct a set of waveforms, or template bank, applicable to searches for compact binary coalescences in Advanced LIGO's second observing run. This template bank is suitable for observing systems composed of two neutron stars, two black holes, or a neutron star ... |
2307.10937 | Adailton Ara\'ujo Filho | K. M. Amarilo, M. B. Ferreira Filho, A. A. Ara\'ujo Filho, J. A. A. S.
Reis | Gravitational waves effects in a Lorentz-violating scenario | 13 pages and 3 figures | Physics Letters B, (2024) 138785 | 10.1016/j.physletb.2024.138785 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper focuses on how the production and polarization of gravitational
waves are affected by spontaneous Lorentz symmetry breaking, which is driven by
a self-interacting vector field. Specifically, we examine the impact of a
smooth quadratic potential and a non-minimal coupling, discussing the
constraints and cau... | [
{
"created": "Thu, 20 Jul 2023 15:09:15 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jun 2024 13:24:58 GMT",
"version": "v2"
}
] | 2024-06-13 | [
[
"Amarilo",
"K. M.",
""
],
[
"Filho",
"M. B. Ferreira",
""
],
[
"Filho",
"A. A. Araújo",
""
],
[
"Reis",
"J. A. A. S.",
""
]
] | This paper focuses on how the production and polarization of gravitational waves are affected by spontaneous Lorentz symmetry breaking, which is driven by a self-interacting vector field. Specifically, we examine the impact of a smooth quadratic potential and a non-minimal coupling, discussing the constraints and causa... |
gr-qc/9606089 | Thomas Thiemann | T. Thiemann | Quantum Spin Dynamics (QSD) | 33 pages, Latex, followed by companion paper after this one | Class.Quant.Grav.15:839-873,1998 | 10.1088/0264-9381/15/4/011 | HUTMP-96/B-351 | gr-qc hep-th | null | An anomaly-free operator corresponding to the Wheeler-DeWitt constraint of
Lorentzian, four-dimensional, canonical, non-perturbative vacuum gravity is
constructed in the continuum. This operator is entirely free of factor ordering
singularities and can be defined in symmetric and non-symmetric form. We work
in the re... | [
{
"created": "Sat, 29 Jun 1996 23:02:13 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Thiemann",
"T.",
""
]
] | An anomaly-free operator corresponding to the Wheeler-DeWitt constraint of Lorentzian, four-dimensional, canonical, non-perturbative vacuum gravity is constructed in the continuum. This operator is entirely free of factor ordering singularities and can be defined in symmetric and non-symmetric form. We work in the real... |
2403.16550 | Michele Maggiore | Enis Belgacem, Michele Maggiore and Thomas Moreau | Coupling elastic media to gravitational waves: an effective field theory
approach | 63 pages | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The interaction of a gravitational wave (GW) with an elastic body is usually
described in terms of a GW "force" driving the oscillations of the body's
normal modes. However, this description is only possible for GW frequencies for
which the response of the elastic body is dominated by a few normal modes. At
higher fr... | [
{
"created": "Mon, 25 Mar 2024 08:54:18 GMT",
"version": "v1"
}
] | 2024-03-26 | [
[
"Belgacem",
"Enis",
""
],
[
"Maggiore",
"Michele",
""
],
[
"Moreau",
"Thomas",
""
]
] | The interaction of a gravitational wave (GW) with an elastic body is usually described in terms of a GW "force" driving the oscillations of the body's normal modes. However, this description is only possible for GW frequencies for which the response of the elastic body is dominated by a few normal modes. At higher freq... |
2309.10028 | Sam Dolan Dr | Ethan J German and Kevin Cunningham and Visakan Balakumar and Niels
Warburton and Sam R Dolan | Adiabatic inspirals under electromagnetic radiation reaction on Kerr
spacetime | 23 pages, 7 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A compact body in orbit about a black hole loses orbital energy and angular
momentum through radiation-reaction processes, inspiralling towards the black
hole until a final plunge. Here we consider a scenario with a charged compact
body in which fluxes of electromagnetic radiation drive this inspiral. We
calculate tr... | [
{
"created": "Mon, 18 Sep 2023 18:00:01 GMT",
"version": "v1"
}
] | 2023-09-20 | [
[
"German",
"Ethan J",
""
],
[
"Cunningham",
"Kevin",
""
],
[
"Balakumar",
"Visakan",
""
],
[
"Warburton",
"Niels",
""
],
[
"Dolan",
"Sam R",
""
]
] | A compact body in orbit about a black hole loses orbital energy and angular momentum through radiation-reaction processes, inspiralling towards the black hole until a final plunge. Here we consider a scenario with a charged compact body in which fluxes of electromagnetic radiation drive this inspiral. We calculate traj... |
1107.4978 | Theodore A. Jacobson | C\'edric Deffayet and Ted Jacobson | On horizon structure of bimetric spacetimes | 9 pages | null | 10.1088/0264-9381/29/6/065009 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the structure of horizons in spacetimes with two metrics, with
applications to the Vainshtein mechanism and other examples. We show, without
using the field equations, that if the two metrics are static, spherically
symmetric, nonsingular, and diagonal in a common coordinate system, then a
Killing horizon ... | [
{
"created": "Mon, 25 Jul 2011 15:24:35 GMT",
"version": "v1"
}
] | 2015-05-28 | [
[
"Deffayet",
"Cédric",
""
],
[
"Jacobson",
"Ted",
""
]
] | We discuss the structure of horizons in spacetimes with two metrics, with applications to the Vainshtein mechanism and other examples. We show, without using the field equations, that if the two metrics are static, spherically symmetric, nonsingular, and diagonal in a common coordinate system, then a Killing horizon fo... |
1111.1655 | Mikael von Strauss | Mikael von Strauss, Angnis Schmidt-May, Jonas Enander, Edvard
Mortsell, S. F. Hassan | Cosmological Solutions in Bimetric Gravity and their Observational Tests | Latex, 26 pages. References added and minor revision of introduction
and appendix B | null | 10.1088/1475-7516/2012/03/042 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain the general cosmological evolution equations for a classically
consistent theory of bimetric gravity. Their analytic solutions are
demonstrated to generically allow for a cosmic evolution starting out from a
matter dominated FLRW universe while relaxing towards a de Sitter (anti-de
Sitter) phase at late cos... | [
{
"created": "Mon, 7 Nov 2011 17:29:51 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Dec 2011 10:22:16 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"von Strauss",
"Mikael",
""
],
[
"Schmidt-May",
"Angnis",
""
],
[
"Enander",
"Jonas",
""
],
[
"Mortsell",
"Edvard",
""
],
[
"Hassan",
"S. F.",
""
]
] | We obtain the general cosmological evolution equations for a classically consistent theory of bimetric gravity. Their analytic solutions are demonstrated to generically allow for a cosmic evolution starting out from a matter dominated FLRW universe while relaxing towards a de Sitter (anti-de Sitter) phase at late cosmi... |
2401.09295 | Bekir Can L\"utf\"uo\u{g}lu | B. Hamil and B. C. L\"utf\"uo\u{g}lu | Noncommutative Schwarzschild black hole surrounded by quintessence:
Thermodynamics, Shadows and Quasinormal modes | 15 Figures, 5 Tables, and 30 pages | Phys. Dark Universe 44, 101484 (2024) | 10.1016/j.dark.2024.101484 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | {In (Sci. Rep. \textbf{12}, 8516 (2022)), Campos et al studied} the
quasinormal modes and shadows of noncommutative Schwarzschild black holes.
Since we know that the quintessence matter surrounding black holes has {
significant effects} on the black hole quantities, {in this study, we aimed to
show this influence by ... | [
{
"created": "Wed, 17 Jan 2024 15:55:28 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Jan 2024 19:43:23 GMT",
"version": "v2"
},
{
"created": "Wed, 10 Apr 2024 17:28:42 GMT",
"version": "v3"
}
] | 2024-04-11 | [
[
"Hamil",
"B.",
""
],
[
"Lütfüoğlu",
"B. C.",
""
]
] | {In (Sci. Rep. \textbf{12}, 8516 (2022)), Campos et al studied} the quasinormal modes and shadows of noncommutative Schwarzschild black holes. Since we know that the quintessence matter surrounding black holes has { significant effects} on the black hole quantities, {in this study, we aimed to show this influence by re... |
2405.00936 | Shin'ichi Nojiri | Shin'ichi Nojiri and G. G. L. Nashed | Gravitational collapse and gravitational wave in Einstein--Gauss-Bonnet
theory with two scalar fields | 21 pages, no figure, Preprint number is added. arXiv admin note: text
overlap with arXiv:2312.02889 | null | null | KEK-Cosmo-0345, KEK-TH-2625 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the gravitational collapse to form the black
hole in the acceleratingly expanding universe in the frame of
Einstein--Gauss-Bonnet theory having two scalar fields and we study the
propagation of the gravitational wave (GW). The collapsing spacetime can be
obtained by using the formulation... | [
{
"created": "Thu, 2 May 2024 01:34:50 GMT",
"version": "v1"
},
{
"created": "Thu, 23 May 2024 05:21:22 GMT",
"version": "v2"
}
] | 2024-05-24 | [
[
"Nojiri",
"Shin'ichi",
""
],
[
"Nashed",
"G. G. L.",
""
]
] | In this paper, we investigate the gravitational collapse to form the black hole in the acceleratingly expanding universe in the frame of Einstein--Gauss-Bonnet theory having two scalar fields and we study the propagation of the gravitational wave (GW). The collapsing spacetime can be obtained by using the formulation o... |
gr-qc/0110071 | Juan Ramirez Mittelbrunn | J. Ramirez, S. Kopeikin | A decoupled system of hyperbolic equations for linearized cosmological
perturbations | 6 pages, no figures, content enlarged | Phys.Lett. B532 (2002) 1-7 | 10.1016/S0370-2693(02)01471-5 | null | gr-qc | null | A decoupled system of hyperbolic partial differential equations for linear
perturbations around any spatially flat FRW universe is obtained for a wide
class of perturbations. The considered perturbing energy momentum-tensors can
be expressed as the sum of the perturbation of a minimally coupled scalar field
plus an a... | [
{
"created": "Mon, 15 Oct 2001 19:19:12 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Feb 2002 15:21:47 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Ramirez",
"J.",
""
],
[
"Kopeikin",
"S.",
""
]
] | A decoupled system of hyperbolic partial differential equations for linear perturbations around any spatially flat FRW universe is obtained for a wide class of perturbations. The considered perturbing energy momentum-tensors can be expressed as the sum of the perturbation of a minimally coupled scalar field plus an arb... |
1508.07903 | Pierre Fleury | Pierre Fleury, Julien Larena, and Jean-Philippe Uzan | The theory of stochastic cosmological lensing | 37+13 pages, 8 figures. A few typos corrected. Matches published
version | null | 10.1088/1475-7516/2015/11/022 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | On the scale of the light beams subtended by small sources, e.g. supernovae,
matter cannot be accurately described as a fluid, which questions the
applicability of standard cosmic lensing to those cases. In this article, we
propose a new formalism to deal with small-scale lensing as a diffusion
process: the Sachs and... | [
{
"created": "Fri, 28 Aug 2015 18:44:49 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Nov 2015 10:53:26 GMT",
"version": "v2"
}
] | 2015-11-16 | [
[
"Fleury",
"Pierre",
""
],
[
"Larena",
"Julien",
""
],
[
"Uzan",
"Jean-Philippe",
""
]
] | On the scale of the light beams subtended by small sources, e.g. supernovae, matter cannot be accurately described as a fluid, which questions the applicability of standard cosmic lensing to those cases. In this article, we propose a new formalism to deal with small-scale lensing as a diffusion process: the Sachs and J... |
2003.07173 | Christian Corda Prof. | C. Corda, F. Feleppa and F. Tamburini | On the quantization of the extremal Reissner-Nordstrom black hole | 7 pages, to appear in Europhysics Letters | EPL 132 (2020) 30001 | 10.1209/0295-5075/132/30001 | null | gr-qc astro-ph.HE hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Following Rosen's quantization rules, two of the Authors (CC and FF) recently
described the Schwarzschild black hole (BH) formed after the gravitational
collapse of a pressureless "star of dust" in terms of a "gravitational hydrogen
atom". Here we generalize this approach to the gravitational collapse of a
charged ob... | [
{
"created": "Wed, 11 Mar 2020 07:18:52 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Oct 2020 13:06:31 GMT",
"version": "v2"
}
] | 2021-01-01 | [
[
"Corda",
"C.",
""
],
[
"Feleppa",
"F.",
""
],
[
"Tamburini",
"F.",
""
]
] | Following Rosen's quantization rules, two of the Authors (CC and FF) recently described the Schwarzschild black hole (BH) formed after the gravitational collapse of a pressureless "star of dust" in terms of a "gravitational hydrogen atom". Here we generalize this approach to the gravitational collapse of a charged obje... |
1908.04309 | T. P. Singh | Palemkota Maithresh and Tejinder P. Singh | Proposal for a new quantum theory of gravity III: Equations for quantum
gravity, and the origin of spontaneous localisation | v1: 25 pages (this paper is a follow-up of arXiv:1903.05402v2 and
arXiv:1906.08248v3). This version v2: minor changes, references updated, to
appear in Zeitschrift fur Naturforschung A | Z. Naturforsch. A 75 (2020) 143 | 10.1515/zna-2019-0267 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new, falsifiable, quantum theory of gravity, which we name
Non-commutative Matter-Gravity. The commutative limit of the theory is
classical general relativity. In the first two papers of this series, we have
introduced the concept of an atom of space-time-matter [STM], which is
described by the spectral ... | [
{
"created": "Mon, 12 Aug 2019 18:00:22 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Sep 2019 06:51:49 GMT",
"version": "v2"
}
] | 2020-02-03 | [
[
"Maithresh",
"Palemkota",
""
],
[
"Singh",
"Tejinder P.",
""
]
] | We present a new, falsifiable, quantum theory of gravity, which we name Non-commutative Matter-Gravity. The commutative limit of the theory is classical general relativity. In the first two papers of this series, we have introduced the concept of an atom of space-time-matter [STM], which is described by the spectral ac... |
gr-qc/0505095 | Roland Triay | Henri-Hugues Fliche (LMMT), Jean-Marie Souriau (CPT), Roland Triay
(CPT) | Anisotropic Hubble expansion of large scale structures | null | Gen.Rel.Grav. 38 (2006) 463-474 | 10.1007/s10714-006-0233-1 | CPT-2005/P.P006 | gr-qc astro-ph | null | We investigate the dynamics of an homogenous distribution of galaxies moving
under the cosmological expansion through Euler-Poisson equations system. The
solutions are interpreted with the aim of understanding the cosmic velocity
fields in the Local Super Cluster, and in particular the presence of a bulk
flow. Among ... | [
{
"created": "Thu, 19 May 2005 07:05:20 GMT",
"version": "v1"
},
{
"created": "Fri, 20 May 2005 15:15:39 GMT",
"version": "v2"
},
{
"created": "Fri, 17 Jun 2005 12:14:43 GMT",
"version": "v3"
},
{
"created": "Fri, 14 Oct 2005 07:03:38 GMT",
"version": "v4"
}
] | 2009-11-11 | [
[
"Fliche",
"Henri-Hugues",
"",
"LMMT"
],
[
"Souriau",
"Jean-Marie",
"",
"CPT"
],
[
"Triay",
"Roland",
"",
"CPT"
]
] | We investigate the dynamics of an homogenous distribution of galaxies moving under the cosmological expansion through Euler-Poisson equations system. The solutions are interpreted with the aim of understanding the cosmic velocity fields in the Local Super Cluster, and in particular the presence of a bulk flow. Among se... |
0909.3464 | Lorenzo Iorio | Lorenzo Iorio | The Impact of the External Field Effect in the MOdified Newtonian
Dynamics on Solar System's Orbits | LaTex2e, 10 pages, no tables, 8 figures. Submitted to the AIP
Proceedings of the Invisible Universe International Conference, 29 June - 3
July 2009, Paris | AIP Conf.Proc.1241:935-944,2010 | 10.1063/1.3462737 | null | gr-qc astro-ph.EP physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We looked at the orbital motions of test particles according to the External
Field Effect (EFE) predicted by the MOdified Newtonian Dynamics (MOND) in the
Oort cloud which falls in the deep MONDian regime (r\approx 50-150 kAU).
Concerning the interpolating function \mu(x), we extensively used the forms
\mu_1=1/(1+x),... | [
{
"created": "Fri, 18 Sep 2009 15:18:15 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Iorio",
"Lorenzo",
""
]
] | We looked at the orbital motions of test particles according to the External Field Effect (EFE) predicted by the MOdified Newtonian Dynamics (MOND) in the Oort cloud which falls in the deep MONDian regime (r\approx 50-150 kAU). Concerning the interpolating function \mu(x), we extensively used the forms \mu_1=1/(1+x),\m... |
0808.1998 | Sunil Maharaj | K. Komathiraj, S. D. Maharaj | Classes of exact Einstein-Maxwell solutions | 16 pages, To appear in Gen. Relativ. Gravit | Gen.Rel.Grav.39:2079-2093,2007 | 10.1007/s10714-007-0510-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find new classes of exact solutions to the Einstein-Maxwell system of
equations for a charged sphere with a particular choice of the electric field
intensity and one of the gravitational potentials. The condition of pressure
isotropy is reduced to a linear, second order differential equation which can
be solved in... | [
{
"created": "Thu, 14 Aug 2008 14:35:24 GMT",
"version": "v1"
}
] | 2009-03-19 | [
[
"Komathiraj",
"K.",
""
],
[
"Maharaj",
"S. D.",
""
]
] | We find new classes of exact solutions to the Einstein-Maxwell system of equations for a charged sphere with a particular choice of the electric field intensity and one of the gravitational potentials. The condition of pressure isotropy is reduced to a linear, second order differential equation which can be solved in g... |
gr-qc/9907083 | Beverly K. Berger | Beverly K. Berger | Influence of scalar fields on the approach to a cosmological singularity | 8 pages includes 5 figures. Uses revtex, psfig | Phys.Rev. D61 (2000) 023508 | 10.1103/PhysRevD.61.023508 | null | gr-qc | null | The method of consistent potentials is used to explain how a minimally
coupled (classical) scalar field can suppress Mixmaster oscillations in the
approach to the singularity of generic cosmological spacetimes.
| [
{
"created": "Mon, 26 Jul 1999 20:32:32 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Berger",
"Beverly K.",
""
]
] | The method of consistent potentials is used to explain how a minimally coupled (classical) scalar field can suppress Mixmaster oscillations in the approach to the singularity of generic cosmological spacetimes. |
0811.1158 | \"Umit Ertem | \"O. A\c{c}{\i}k and \"U. Ertem | Effect of Modified Dispersion Relations on Immirzi Parameter | 5 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black hole entropy calculations which are based on counting of microstates
and based on modified dispersion relations in the framework of loop quantum
gravity are considered. We suggest that the inconsistency of two approaches can
be explained by different ways. This inconsistency can affect the definition
and consta... | [
{
"created": "Fri, 7 Nov 2008 15:02:46 GMT",
"version": "v1"
}
] | 2008-11-10 | [
[
"Açık",
"Ö.",
""
],
[
"Ertem",
"Ü.",
""
]
] | Black hole entropy calculations which are based on counting of microstates and based on modified dispersion relations in the framework of loop quantum gravity are considered. We suggest that the inconsistency of two approaches can be explained by different ways. This inconsistency can affect the definition and constanc... |
gr-qc/0309084 | Margus Saal | P. Kuusk and M. Saal | A Cosmological Model of Holographic Brane Gravity | 17 pages, 2 figures | Gen.Rel.Grav. 36 (2004) 1001-1014 | 10.1023/B:GERG.0000018086.21248.47 | null | gr-qc | null | A cosmological scenario with two branes (A and B) moving in a 5-dimensional
bulk is considered. As in the case of ecpyrotic and born-again braneworld
models it is possible that the branes collide. The energy-momentum tensor is
taken to describe a perfect barotropic fluid on the A-brane and a
phenomenological time-dep... | [
{
"created": "Thu, 18 Sep 2003 09:19:08 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Kuusk",
"P.",
""
],
[
"Saal",
"M.",
""
]
] | A cosmological scenario with two branes (A and B) moving in a 5-dimensional bulk is considered. As in the case of ecpyrotic and born-again braneworld models it is possible that the branes collide. The energy-momentum tensor is taken to describe a perfect barotropic fluid on the A-brane and a phenomenological time-depen... |
1701.03315 | Tim-Torben Paetz | Tim-Torben Paetz | Algorithmic characterization results for the Kerr-NUT-(A)dS space-time.
II. KIDs for the Kerr-(A)(de Sitter) family | 31 pages | null | 10.1063/1.4980068 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We characterize Cauchy data sets leading to vacuum space-times with vanishing
Mars-Simon tensor. This approach provides an algorithmic procedure to check
whether a given initial data set $(\Sigma,h_{ij},K_{ij})$ evolves into a
space-time which is locally isometric to a member of the Kerr-(A)(dS) family.
| [
{
"created": "Thu, 12 Jan 2017 11:37:01 GMT",
"version": "v1"
}
] | 2017-05-24 | [
[
"Paetz",
"Tim-Torben",
""
]
] | We characterize Cauchy data sets leading to vacuum space-times with vanishing Mars-Simon tensor. This approach provides an algorithmic procedure to check whether a given initial data set $(\Sigma,h_{ij},K_{ij})$ evolves into a space-time which is locally isometric to a member of the Kerr-(A)(dS) family. |
1011.6168 | Arman Taghavi-Chabert | Arman Taghavi-Chabert | Optical structures, algebraically special spacetimes, and the
Goldberg-Sachs theorem in five dimensions | Final corrected version (same as published). Remark 2.9 corrected.
Corollary 3.10 clarified | Class.Quant.Grav.28:145010,2011 | 10.1088/0264-9381/28/14/145010 | null | gr-qc hep-th math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Optical (or Robinson) structures are one generalisation of four-dimensional
shearfree congruences of null geodesics to higher dimensions. They are
Lorentzian analogues of complex and CR structures. In this context, we extend
the Goldberg-Sachs theorem to five dimensions. To be precise, we find a new
algebraic conditi... | [
{
"created": "Mon, 29 Nov 2010 09:49:58 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Feb 2011 07:19:58 GMT",
"version": "v2"
},
{
"created": "Wed, 20 Apr 2011 20:12:32 GMT",
"version": "v3"
},
{
"created": "Tue, 12 Jul 2011 13:30:23 GMT",
"version": "v4"
}
] | 2015-03-17 | [
[
"Taghavi-Chabert",
"Arman",
""
]
] | Optical (or Robinson) structures are one generalisation of four-dimensional shearfree congruences of null geodesics to higher dimensions. They are Lorentzian analogues of complex and CR structures. In this context, we extend the Goldberg-Sachs theorem to five dimensions. To be precise, we find a new algebraic condition... |
2110.13914 | Paul Tod | Paul Tod | A note on Penrose limits | 4 pages | null | null | null | gr-qc math.DG | http://creativecommons.org/licenses/by/4.0/ | As a footnote to arXiv:1909.07756, I show that, given a (time-like) umbilic
3-surface $\Sigma$ in a 4-dimensional space-time $M$, the Penrose limit taken
along any null geodesic $\Gamma$ which lies in $\Sigma$ is a diagonalisable
plane-wave.
| [
{
"created": "Tue, 26 Oct 2021 13:41:20 GMT",
"version": "v1"
}
] | 2021-10-28 | [
[
"Tod",
"Paul",
""
]
] | As a footnote to arXiv:1909.07756, I show that, given a (time-like) umbilic 3-surface $\Sigma$ in a 4-dimensional space-time $M$, the Penrose limit taken along any null geodesic $\Gamma$ which lies in $\Sigma$ is a diagonalisable plane-wave. |
gr-qc/0407003 | Naresh Dadhich | Naresh Dadhich | Probing Universality Of Gravity | 6 pages, latex, Lecture delivered at the 11th Regional Conference on
Mathematical Physics, IPM, Tehran, to appear in the Proceedings | null | 10.1142/9789812701862_0025 | null | gr-qc hep-th | null | I wish to expound a novel perspective of probing universal character of
gravity. To begin with, inclusion of zero mass particle in mechanics leads to
special relativity while its interaction with a universal force shared by all
particles leads to general relativity. The universal nature of force further
suggests that... | [
{
"created": "Thu, 1 Jul 2004 12:08:08 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Dadhich",
"Naresh",
""
]
] | I wish to expound a novel perspective of probing universal character of gravity. To begin with, inclusion of zero mass particle in mechanics leads to special relativity while its interaction with a universal force shared by all particles leads to general relativity. The universal nature of force further suggests that i... |
1908.02368 | David Bermudez Dr. | Alhan Moreno-Ruiz, David Bermudez (Cinvestav, Mexico) | Hawking temperature in dispersive media: Analytical and numerical study | 12 pages, 8 figures, 5 tables, 36 references | null | 10.1016/j.aop.2020.168268 | null | gr-qc cond-mat.quant-gas physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of analog gravity the Hawking effect can be generalized to
domains outside astrophysics. Arguably, the most successful systems for this
analogy have been so far the sonic and the optical ones. However, problems
arise in the analog systems as their dispersive effects are too large to be
ignored, and thi... | [
{
"created": "Tue, 6 Aug 2019 21:08:11 GMT",
"version": "v1"
}
] | 2020-08-26 | [
[
"Moreno-Ruiz",
"Alhan",
"",
"Cinvestav, Mexico"
],
[
"Bermudez",
"David",
"",
"Cinvestav, Mexico"
]
] | In the context of analog gravity the Hawking effect can be generalized to domains outside astrophysics. Arguably, the most successful systems for this analogy have been so far the sonic and the optical ones. However, problems arise in the analog systems as their dispersive effects are too large to be ignored, and this ... |
0709.4682 | Alessandra Buonanno | Alessandra Buonanno | Gravitational waves | 50 pages, 13 figures; to appear in the Proceedings of Les Houches
Summer School, Particle Physics and Cosmology: The Fabric of Spacetime, Les
Houches, France, 31 Jul - 25 Aug 2006 | null | null | null | gr-qc | null | These lectures are envisioned to be an introductory, basic course in
gravitational-wave physics.
| [
{
"created": "Fri, 28 Sep 2007 19:55:43 GMT",
"version": "v1"
}
] | 2007-10-01 | [
[
"Buonanno",
"Alessandra",
""
]
] | These lectures are envisioned to be an introductory, basic course in gravitational-wave physics. |
1605.06212 | Mariano Celada | Mariano Celada, Diego Gonz\'alez, Merced Montesinos | Plebanski-like action for general relativity and anti-self-dual gravity | 6 pages, accepted for publication in Physical Review D | Phys. Rev. D 93, 104058 (2016) | 10.1103/PhysRevD.93.104058 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new $BF$-type action for complex general relativity with or
without a cosmological constant resembling Plebanski's action, which depends on
an SO(3,$\mathbb{C}$) connection, a set of 2-forms, a symmetric matrix, and a
4-form. However, it differs from the Plebanski formulation in the way that the
symmetri... | [
{
"created": "Fri, 20 May 2016 04:37:12 GMT",
"version": "v1"
}
] | 2016-05-31 | [
[
"Celada",
"Mariano",
""
],
[
"González",
"Diego",
""
],
[
"Montesinos",
"Merced",
""
]
] | We present a new $BF$-type action for complex general relativity with or without a cosmological constant resembling Plebanski's action, which depends on an SO(3,$\mathbb{C}$) connection, a set of 2-forms, a symmetric matrix, and a 4-form. However, it differs from the Plebanski formulation in the way that the symmetric ... |
1402.5004 | Rodrigo Holanda | S. H. Pereira and R. F. L. Holanda | Particle creation in a f(R) theory with cosmological constraints | To appear in the General Relativity and Gravitation. arXiv admin
note: text overlap with arXiv:1108.3346 | null | 10.1007/s10714-014-1699-x | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the creation of super-massive real scalar particles in
the framework of a $f(R)=R-\beta/R^n$ modified gravity theory, with parameters
constrained by observational data. The analysis is restrict to a homogeneous
and isotropic flat and radiation dominated universe. We compare the results to
the s... | [
{
"created": "Thu, 20 Feb 2014 14:13:52 GMT",
"version": "v1"
}
] | 2017-05-18 | [
[
"Pereira",
"S. H.",
""
],
[
"Holanda",
"R. F. L.",
""
]
] | In this paper we study the creation of super-massive real scalar particles in the framework of a $f(R)=R-\beta/R^n$ modified gravity theory, with parameters constrained by observational data. The analysis is restrict to a homogeneous and isotropic flat and radiation dominated universe. We compare the results to the sta... |
1310.2505 | Andrew Makarenko | Yu.A. Rybalov, A. N. Makarenko, K.E. Osetrin | Accelerating and decelerating cosmology from spinor and scalar fields
non-minimally coupled with f(R) gravity | 5 pages, to appear in Astro. Space Sci | Astrophys.Space Sci. 349 (2014) 561-566 | 10.1007/s10509-013-1631-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we investigate the accelerating and decelerating cosmological
models with non-linear spinor fields and non-minimal interaction of $f(R)$
gravity with a scalar field. We combine two different approaches to the
description of dark energy: modified gravity theory and introduction of the
additional fields. ... | [
{
"created": "Wed, 9 Oct 2013 14:43:39 GMT",
"version": "v1"
}
] | 2013-12-12 | [
[
"Rybalov",
"Yu. A.",
""
],
[
"Makarenko",
"A. N.",
""
],
[
"Osetrin",
"K. E.",
""
]
] | In this paper we investigate the accelerating and decelerating cosmological models with non-linear spinor fields and non-minimal interaction of $f(R)$ gravity with a scalar field. We combine two different approaches to the description of dark energy: modified gravity theory and introduction of the additional fields. So... |
1005.0743 | Thomas B\"ackdahl | Thomas B\"ackdahl and Juan A. Valiente Kroon | On the construction of a geometric invariant measuring the deviation
from Kerr data | 36 pages. Updated references. Technical details corrected | Annales Henri Poincare 11:1225-1271,2010 | 10.1007/s00023-010-0063-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article contains a detailed and rigorous proof of the construction of a
geometric invariant for initial data sets for the Einstein vacuum field
equations. This geometric invariant vanishes if and only if the initial data
set corresponds to data for the Kerr spacetime, and thus, it characterises this
type of data... | [
{
"created": "Wed, 5 May 2010 12:57:47 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Oct 2010 13:59:20 GMT",
"version": "v2"
}
] | 2011-01-04 | [
[
"Bäckdahl",
"Thomas",
""
],
[
"Kroon",
"Juan A. Valiente",
""
]
] | This article contains a detailed and rigorous proof of the construction of a geometric invariant for initial data sets for the Einstein vacuum field equations. This geometric invariant vanishes if and only if the initial data set corresponds to data for the Kerr spacetime, and thus, it characterises this type of data. ... |
2007.09831 | Guansheng He | Guansheng He and Wenbin Lin | Analytical Derivation of Second-Order Deflection in Equatorial Plane of
a Radially Moving Kerr-Newman Black Hole | null | Class. Quantum Grav. 34, 105006 (2017) | 10.1088/1361-6382/aa691d | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we base on the second-order post-Minkowskian equations of
motion, and apply an iterative technique to analytically derive the
gravitational deflection of the relativistic particles in the equatorial plane
of Kerr-Newman black hole with a radial (or longitudinal) and constant
velocity. We find that the k... | [
{
"created": "Mon, 20 Jul 2020 01:45:59 GMT",
"version": "v1"
}
] | 2020-07-27 | [
[
"He",
"Guansheng",
""
],
[
"Lin",
"Wenbin",
""
]
] | In this work, we base on the second-order post-Minkowskian equations of motion, and apply an iterative technique to analytically derive the gravitational deflection of the relativistic particles in the equatorial plane of Kerr-Newman black hole with a radial (or longitudinal) and constant velocity. We find that the kin... |
1709.06154 | Sreenath Kizhakkumpurath Manikandan | Sreenath K. Manikandan and Andrew N. Jordan | Andreev reflections and the quantum physics of black holes | 19 pages, 7 figures | Phys. Rev. D 96, 124011 (2017) | 10.1103/PhysRevD.96.124011 | null | gr-qc cond-mat.supr-con hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We establish an analogy between superconductor-metal interfaces and the
quantum physics of a black hole, using the proximity effect. We show that the
metal-superconductor interface can be thought of as an event horizon and
Andreev reflection from the interface is analogous to the Hawking radiation in
black holes. We ... | [
{
"created": "Mon, 18 Sep 2017 20:22:57 GMT",
"version": "v1"
}
] | 2017-12-20 | [
[
"Manikandan",
"Sreenath K.",
""
],
[
"Jordan",
"Andrew N.",
""
]
] | We establish an analogy between superconductor-metal interfaces and the quantum physics of a black hole, using the proximity effect. We show that the metal-superconductor interface can be thought of as an event horizon and Andreev reflection from the interface is analogous to the Hawking radiation in black holes. We de... |
1907.08287 | David Sloan | David Sloan | Scalar Fields and the FLRW Singularity | 17 pages, 1 figure | null | 10.1088/1361-6382/ab4eb4 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dynamics of multiple scalar fields on a flat FLRW spacetime can be
described entirely as a relational system in terms of the matter alone. The
matter dynamics is an autonomous system from which the geometrical dynamics can
be inferred, and this autonomous system remains deterministic at the point
corresponding to... | [
{
"created": "Thu, 18 Jul 2019 21:22:52 GMT",
"version": "v1"
}
] | 2020-01-08 | [
[
"Sloan",
"David",
""
]
] | The dynamics of multiple scalar fields on a flat FLRW spacetime can be described entirely as a relational system in terms of the matter alone. The matter dynamics is an autonomous system from which the geometrical dynamics can be inferred, and this autonomous system remains deterministic at the point corresponding to t... |
1101.0865 | Yurii Ignatyev | Yu.G. Ignatyev, E.G. Chepkunova | Exact plane - symmetric non-stationary solution of the self-consistent
equations of Einstein - Maxwell for a magnetoactive plasma | 11 pages, 6 references | Gravitation & Cosmology, Vol. 10 (2004), No. 3 (39), pp. 219-223 | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An exact plane-symmetric non-stationary solution to the Einstein-Maxwell
equations for a magnetoactive plasma is obtained and studied.
| [
{
"created": "Wed, 5 Jan 2011 01:32:32 GMT",
"version": "v1"
}
] | 2011-01-06 | [
[
"Ignatyev",
"Yu. G.",
""
],
[
"Chepkunova",
"E. G.",
""
]
] | An exact plane-symmetric non-stationary solution to the Einstein-Maxwell equations for a magnetoactive plasma is obtained and studied. |
2212.05969 | Victoria Volkova | S. Mironov, V. Rubakov, V. Volkova | In hot pursuit of a stable wormhole in beyond Horndeski theory | 30 pages, 2 figures | null | 10.1103/PhysRevD.107.104061 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the issue of stability at the linearized level for static,
spherically symmetric wormhole solutions within a subclass of scalar-tensor
theories of beyond Horndeski type. In this class of theories we derive a set of
stability conditions ensuring the absence of ghosts and both radial and angular
gradient in... | [
{
"created": "Mon, 12 Dec 2022 15:23:52 GMT",
"version": "v1"
}
] | 2023-06-14 | [
[
"Mironov",
"S.",
""
],
[
"Rubakov",
"V.",
""
],
[
"Volkova",
"V.",
""
]
] | We consider the issue of stability at the linearized level for static, spherically symmetric wormhole solutions within a subclass of scalar-tensor theories of beyond Horndeski type. In this class of theories we derive a set of stability conditions ensuring the absence of ghosts and both radial and angular gradient inst... |
1503.03754 | Igor Khavkine | Igor Khavkine | Local and gauge invariant observables in gravity | v3: 20 pages; minor corrections, a few more references; close to
published version | Class. Quantum Grav. 32, 185019 (2015) | 10.1088/0264-9381/32/18/185019 | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | It is well known that general relativity (GR) does not possess any
non-trivial local (in a precise standard sense) and diffeomorphism invariant
observables. We propose a generalized notion of local observables, which retain
the most important properties that follow from the standard definition of
locality, yet is fle... | [
{
"created": "Thu, 12 Mar 2015 14:54:36 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Apr 2015 15:02:53 GMT",
"version": "v2"
},
{
"created": "Tue, 15 Sep 2015 17:26:43 GMT",
"version": "v3"
}
] | 2015-09-16 | [
[
"Khavkine",
"Igor",
""
]
] | It is well known that general relativity (GR) does not possess any non-trivial local (in a precise standard sense) and diffeomorphism invariant observables. We propose a generalized notion of local observables, which retain the most important properties that follow from the standard definition of locality, yet is flexi... |
1408.2799 | Mohammad Reza Tanhayi | M. Reza Tanhayi | Particle Creation in Global de Sitter Space: Bulk Space Consideration | 18 pages, ref.s added, published version | IJMPD Vol. 24, No. 7 (2015) 1550052 | 10.1142/S0218271815500522 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently in \cite{Anderson:2013zia, Anderson:2013ila}, it was shown that
global de Sitter space is unstable even to the massive particle creation with
no self-interactions. In this paper we study the instability by making use of
the coordinate-independent plane wave in de Sitter space, within this
formalism, we show ... | [
{
"created": "Tue, 12 Aug 2014 18:46:33 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Apr 2015 17:25:48 GMT",
"version": "v2"
}
] | 2015-04-28 | [
[
"Tanhayi",
"M. Reza",
""
]
] | Recently in \cite{Anderson:2013zia, Anderson:2013ila}, it was shown that global de Sitter space is unstable even to the massive particle creation with no self-interactions. In this paper we study the instability by making use of the coordinate-independent plane wave in de Sitter space, within this formalism, we show th... |
1911.01020 | Alexander Simpson | Alex Simpson and Matt Visser | Regular black holes with asymptotically Minkowski cores | V1: 17 pages; V2: 18 pages, 8 references added, no physics changes | Universe 2020, 6(1), 8 | 10.3390/universe6010008 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Standard models of "regular black holes" typically have asymptotically de
Sitter regions at their cores. Herein we shall consider novel "hollow" regular
black holes, those with asymptotically Minkowski cores. The reason for doing so
is twofold: First, these models greatly simplify the physics in the deep core,
and se... | [
{
"created": "Mon, 4 Nov 2019 03:19:19 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Nov 2019 00:54:30 GMT",
"version": "v2"
}
] | 2021-04-30 | [
[
"Simpson",
"Alex",
""
],
[
"Visser",
"Matt",
""
]
] | Standard models of "regular black holes" typically have asymptotically de Sitter regions at their cores. Herein we shall consider novel "hollow" regular black holes, those with asymptotically Minkowski cores. The reason for doing so is twofold: First, these models greatly simplify the physics in the deep core, and seco... |
gr-qc/0406115 | Mauricio Bellini | Mariano Anabitarte (Mar del Plata University) and Mauricio Bellini
(Mar del Plata University and CONICET) | Inflaton field fluctuations from gauge-invariant metric fluctuations
during inflation | accepted in Il Nuov. Cim. B | Nuovo Cim.B119:615-623,2004 | 10.1393/ncb/i2004-10154-2 | null | gr-qc astro-ph hep-ph hep-th | null | The evolution of the inflaton field fluctuations from gauge-invariant metric
fluctuations is discused. In particular, the case of a symmetric
$\phi_c$-exponential potential is analyzed.
| [
{
"created": "Mon, 28 Jun 2004 23:22:59 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Nov 2004 14:48:31 GMT",
"version": "v2"
}
] | 2010-11-11 | [
[
"Anabitarte",
"Mariano",
"",
"Mar del Plata University"
],
[
"Bellini",
"Mauricio",
"",
"Mar del Plata University and CONICET"
]
] | The evolution of the inflaton field fluctuations from gauge-invariant metric fluctuations is discused. In particular, the case of a symmetric $\phi_c$-exponential potential is analyzed. |
2204.02721 | Carlos Palenzuela | C.Palenzuela, S.L.Liebling and B.Mi\~nano | Large Eddy Simulations of Magnetized Mergers of Neutron Stars with
Neutrinos | 20 pages, 11 figures. Modified to match the accepted version of the
paper | null | 10.1103/PhysRevD.105.103020 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutron star mergers are very violent events involving extreme physical
processes: dynamic, strong-field gravity, large magnetic field, very hot, dense
matter, and the copious production of neutrinos. Accurate modeling of such a
system and its associated multi-messenger signals, such as gravitational waves,
short gam... | [
{
"created": "Wed, 6 Apr 2022 10:52:24 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Apr 2022 09:17:16 GMT",
"version": "v2"
},
{
"created": "Fri, 6 May 2022 19:23:17 GMT",
"version": "v3"
}
] | 2022-06-01 | [
[
"Palenzuela",
"C.",
""
],
[
"Liebling",
"S. L.",
""
],
[
"Miñano",
"B.",
""
]
] | Neutron star mergers are very violent events involving extreme physical processes: dynamic, strong-field gravity, large magnetic field, very hot, dense matter, and the copious production of neutrinos. Accurate modeling of such a system and its associated multi-messenger signals, such as gravitational waves, short gamma... |
1901.06948 | Mu-Tao Wang | Po-Ning Chen, Mu-Tao Wang, Ye-Kai Wang, and Shing-Tung Yau | Quasi-local mass at axially symmetric null infinity | Contribution to MG15 | null | 10.1142/S0218271819300131 | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give a brief review of the definition of the Wang-Yau quasilocal mass and
discuss the evaluation of which on surfaces of unit size at null infinity of an
axi-symmetric spacetime in Bondi-van der Burg-Metzner coordinates.
| [
{
"created": "Mon, 21 Jan 2019 15:04:18 GMT",
"version": "v1"
}
] | 2019-06-26 | [
[
"Chen",
"Po-Ning",
""
],
[
"Wang",
"Mu-Tao",
""
],
[
"Wang",
"Ye-Kai",
""
],
[
"Yau",
"Shing-Tung",
""
]
] | We give a brief review of the definition of the Wang-Yau quasilocal mass and discuss the evaluation of which on surfaces of unit size at null infinity of an axi-symmetric spacetime in Bondi-van der Burg-Metzner coordinates. |
gr-qc/0106027 | Gaston Giribet | Gaston Giribet, Claudio Simeone | Comments on quantum cosmology with extrinsic time | 11 pages, typos corrected, version to appear in Phys.Lett.A | Phys.Lett.A287:344-348,2001 | 10.1016/S0375-9601(01)00507-2 | null | gr-qc | null | The closed de Sitter universe is used to present a way to deal with the
deparametrization and quantization of cosmological models with extrinsic time.
| [
{
"created": "Thu, 7 Jun 2001 16:14:03 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Aug 2001 21:15:30 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Giribet",
"Gaston",
""
],
[
"Simeone",
"Claudio",
""
]
] | The closed de Sitter universe is used to present a way to deal with the deparametrization and quantization of cosmological models with extrinsic time. |
1811.10474 | Dirk Puetzfeld | Yuri N. Obukhov, Dirk Puetzfeld | Measuring the gravitational field in General Relativity: From deviation
equations and the gravitational compass to relativistic clock gradiometry | To appear in "Relativistic Geodesy: Foundations and Application", D.
Puetzfeld et. al. (eds.), Fundamental Theories of Physics, Springer 2018, 52
pages, in print. arXiv admin note: text overlap with arXiv:1804.11106,
arXiv:1511.08465, arXiv:1805.10673 | null | 10.1007/978-3-030-11500-5_3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | How does one measure the gravitational field? We give explicit answers to
this fundamental question and show how all components of the curvature tensor,
which represents the gravitational field in Einstein's theory of General
Relativity, can be obtained by means of two different methods. The first method
relies on th... | [
{
"created": "Wed, 21 Nov 2018 08:28:13 GMT",
"version": "v1"
}
] | 2019-03-06 | [
[
"Obukhov",
"Yuri N.",
""
],
[
"Puetzfeld",
"Dirk",
""
]
] | How does one measure the gravitational field? We give explicit answers to this fundamental question and show how all components of the curvature tensor, which represents the gravitational field in Einstein's theory of General Relativity, can be obtained by means of two different methods. The first method relies on the ... |
1904.00180 | Yuri Obukhov | Yuri N. Obukhov | Premetric approach in gravity and electrodynamics | 6 pages, MG15 proceedings | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The basics of the premetric approach are discussed, including the essential
details of the formalism and some of its beautiful consequences. We demonstrate
how the classical electrodynamics can be developed without a metric in a quite
straightforward way: Maxwell's equations, together with the general response
law fo... | [
{
"created": "Sat, 30 Mar 2019 09:30:57 GMT",
"version": "v1"
}
] | 2019-04-02 | [
[
"Obukhov",
"Yuri N.",
""
]
] | The basics of the premetric approach are discussed, including the essential details of the formalism and some of its beautiful consequences. We demonstrate how the classical electrodynamics can be developed without a metric in a quite straightforward way: Maxwell's equations, together with the general response law for ... |
2403.17716 | Sneha Pradhan | Sneha Pradhan, P.K. Sahoo | A Comprehensive Study of Massive Compact Star Admitting Conformal Motion
Under Bardeen Geometry | Nuclear Physics B published version | Nuclear Physics B, 1002 (2024) 116523 | 10.1016/j.nuclphysb.2024.116523 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | This article primarily investigates the existence of the charged compact star
under the conformal motion treatment within the context of f(Q) gravity. We
have developed two models by implementing the power-law and linear form of
conformal factor, enabling an in-depth comparison in our study. We have
selected the MIT ... | [
{
"created": "Tue, 26 Mar 2024 14:00:07 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Mar 2024 13:14:47 GMT",
"version": "v2"
}
] | 2024-04-02 | [
[
"Pradhan",
"Sneha",
""
],
[
"Sahoo",
"P. K.",
""
]
] | This article primarily investigates the existence of the charged compact star under the conformal motion treatment within the context of f(Q) gravity. We have developed two models by implementing the power-law and linear form of conformal factor, enabling an in-depth comparison in our study. We have selected the MIT Ba... |
1612.07344 | Alberto Molgado | Jasel Berra-Montiel, Jairo Mart\'inez-Montoya and Alberto Molgado | The Unruh effect for higher derivative field theory | 12 pages, no figures | Class. Quantum Grav. 34 075007 (2017) | 10.1088/1361-6382/aa601f | null | gr-qc hep-th math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse the emergence of the Unruh effect within the context of a field
Lagrangian theory associated to the Pais-Uhlenbeck fourth order oscillator
model. To this end, we introduce a transformation that brings the Hamiltonian
bounded from below and is consistent with $\mathcal{PT}$-symmetric quantum
mechanics. We f... | [
{
"created": "Wed, 21 Dec 2016 21:35:42 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Mar 2017 19:25:31 GMT",
"version": "v2"
}
] | 2017-03-30 | [
[
"Berra-Montiel",
"Jasel",
""
],
[
"Martínez-Montoya",
"Jairo",
""
],
[
"Molgado",
"Alberto",
""
]
] | We analyse the emergence of the Unruh effect within the context of a field Lagrangian theory associated to the Pais-Uhlenbeck fourth order oscillator model. To this end, we introduce a transformation that brings the Hamiltonian bounded from below and is consistent with $\mathcal{PT}$-symmetric quantum mechanics. We fin... |
1810.04405 | Cristina Blaga | Paul Blaga and Cristina Blaga | Phase-plane analysis of the timelike geodesics around a spherically
symmetric static dilaton black hole | 12 pages, 4 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this note we take a dynamical systems approach to the equations of motion
of a free test particle moving around a spherically symmetric static dilaton
black hole, written in the Einstein frame. The equations of motion are obtained
using the Euler-Lagrange formalism. Using the first integrals of motion, we
reach th... | [
{
"created": "Wed, 10 Oct 2018 07:56:27 GMT",
"version": "v1"
}
] | 2018-10-11 | [
[
"Blaga",
"Paul",
""
],
[
"Blaga",
"Cristina",
""
]
] | In this note we take a dynamical systems approach to the equations of motion of a free test particle moving around a spherically symmetric static dilaton black hole, written in the Einstein frame. The equations of motion are obtained using the Euler-Lagrange formalism. Using the first integrals of motion, we reach the ... |
0910.3637 | Nikolaos Mavromatos | Jose Bernabeu, Catalina Espinoza and Nick E. Mavromatos | Cosmological Constant and Local Gravity | 7 pages revtex, no figures; discussion on light bending added, no
effect on conclusions, version to appear in Physical Review D. | Phys.Rev.D81:084002,2010 | 10.1103/PhysRevD.81.084002 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the linearization of Einstein equations in the presence of a
cosmological constant, by expanding the solution for the metric around a flat
Minkowski space-time. We demonstrate that one can find consistent solutions to
the linearized set of equations for the metric perturbations, in the Lorentz
gauge, which... | [
{
"created": "Mon, 19 Oct 2009 18:33:16 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Oct 2009 15:29:28 GMT",
"version": "v2"
},
{
"created": "Fri, 12 Mar 2010 10:58:32 GMT",
"version": "v3"
}
] | 2010-04-14 | [
[
"Bernabeu",
"Jose",
""
],
[
"Espinoza",
"Catalina",
""
],
[
"Mavromatos",
"Nick E.",
""
]
] | We discuss the linearization of Einstein equations in the presence of a cosmological constant, by expanding the solution for the metric around a flat Minkowski space-time. We demonstrate that one can find consistent solutions to the linearized set of equations for the metric perturbations, in the Lorentz gauge, which a... |
1907.02507 | Bernardo Araneda | Bernardo Araneda | Two-dimensional twistor manifolds and Teukolsky operators | 28 pages. V2: references added; expanded discussion on complex and
holomorphic structures; one section added; minor changes in notation. The
term `twistor surface' was replaced by `2D twistor space' in order to avoid
possible confusion with other twistor concepts | null | 10.1007/s11005-020-01307-8 | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Teukolsky equations are currently the leading approach for analysing
stability of linear massless fields propagating in rotating black holes. It has
recently been shown that the geometry of these equations can be understood in
terms of a connection constructed from the conformal and complex structure of
Petrov ty... | [
{
"created": "Thu, 4 Jul 2019 17:41:56 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Dec 2019 11:57:14 GMT",
"version": "v2"
}
] | 2020-07-15 | [
[
"Araneda",
"Bernardo",
""
]
] | The Teukolsky equations are currently the leading approach for analysing stability of linear massless fields propagating in rotating black holes. It has recently been shown that the geometry of these equations can be understood in terms of a connection constructed from the conformal and complex structure of Petrov type... |
2303.13749 | Ping Shen | Ping Shen, Wen-Biao Han, Chen Zhang, Shu-Cheng Yang, Xing-Yu Zhong, Ye
Jiang, Qiuxin Cui | Influence of mass-ratio corrections in extreme-mass-ratio inspirals for
testing general relativity | null | null | 10.1103/PhysRevD.108.064015 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The popular waveform templates of extreme-mass-ratio inspirals usually omit
the mass-ratio corrections in the conservative dynamics, and employ adiabatic
approximation to include the radiation reaction. With the help of
effective-one-body dynamics, we investigate the influence of mass-ratio
corrections in the conserv... | [
{
"created": "Fri, 24 Mar 2023 02:07:45 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Sep 2023 07:19:19 GMT",
"version": "v2"
}
] | 2023-09-22 | [
[
"Shen",
"Ping",
""
],
[
"Han",
"Wen-Biao",
""
],
[
"Zhang",
"Chen",
""
],
[
"Yang",
"Shu-Cheng",
""
],
[
"Zhong",
"Xing-Yu",
""
],
[
"Jiang",
"Ye",
""
],
[
"Cui",
"Qiuxin",
""
]
] | The popular waveform templates of extreme-mass-ratio inspirals usually omit the mass-ratio corrections in the conservative dynamics, and employ adiabatic approximation to include the radiation reaction. With the help of effective-one-body dynamics, we investigate the influence of mass-ratio corrections in the conservat... |
1410.2511 | Emanuele Berti | Hector O. Silva, Hajime Sotani, Emanuele Berti, Michael Horbatsch | Torsional oscillations of neutron stars in scalar-tensor theory of
gravity | 13 pages, 8 figures | Phys. Rev. D 90, 124044 (2014) | 10.1103/PhysRevD.90.124044 | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study torsional oscillations of neutron stars in the scalar-tensor theory
of gravity using the relativistic Cowling approximation. We compute unperturbed
neutron star models adopting realistic equations of state for the neutron
star's core and crust. For scalar-tensor theories that allow for spontaneous
scalarizat... | [
{
"created": "Thu, 9 Oct 2014 15:42:00 GMT",
"version": "v1"
}
] | 2014-12-24 | [
[
"Silva",
"Hector O.",
""
],
[
"Sotani",
"Hajime",
""
],
[
"Berti",
"Emanuele",
""
],
[
"Horbatsch",
"Michael",
""
]
] | We study torsional oscillations of neutron stars in the scalar-tensor theory of gravity using the relativistic Cowling approximation. We compute unperturbed neutron star models adopting realistic equations of state for the neutron star's core and crust. For scalar-tensor theories that allow for spontaneous scalarizatio... |
0807.2985 | Wolfgang Tichy | Wolfgang Tichy, Pedro Marronetti | The final mass and spin of black hole mergers | Corrected typos, shortened introduction | Phys.Rev.D78:081501,2008 | 10.1103/PhysRevD.78.081501 | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider black holes resulting from binary black hole mergers. By fitting
to numerical results we construct analytic formulas that predict the mass and
spin of the final black hole. Our formulas are valid for arbitrary initial
spins and mass ratios and agree well with available numerical simulations. We
use our sp... | [
{
"created": "Fri, 18 Jul 2008 14:52:03 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Jul 2008 16:53:42 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Tichy",
"Wolfgang",
""
],
[
"Marronetti",
"Pedro",
""
]
] | We consider black holes resulting from binary black hole mergers. By fitting to numerical results we construct analytic formulas that predict the mass and spin of the final black hole. Our formulas are valid for arbitrary initial spins and mass ratios and agree well with available numerical simulations. We use our spin... |
gr-qc/9612050 | Maria Guimaraes | M. E. X. Guimaraes (UWCC, Dept. of Physics and Astronomy) | Semiclassical Gravitational Effects in the Spacetime of a Magnetic Flux
Cosmic String | LATEX, 6 pages, to be published in the Proceedings of the Spanish
Relativity Meeting 1996 (ERE-96), Valencia, Spain | null | null | null | gr-qc | null | It is well-known that some physical effects may arise in the spacetime of a
straigth cosmic string due to its global conic properties. Among these effects,
the vacuum polarization effect has been extensively studied in the litterature.
In papers of reference [4] a more general situation has been considered in
which t... | [
{
"created": "Wed, 18 Dec 1996 11:41:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Guimaraes",
"M. E. X.",
"",
"UWCC, Dept. of Physics and Astronomy"
]
] | It is well-known that some physical effects may arise in the spacetime of a straigth cosmic string due to its global conic properties. Among these effects, the vacuum polarization effect has been extensively studied in the litterature. In papers of reference [4] a more general situation has been considered in which the... |
2106.11095 | Naveena Kumara A | A. Naveena Kumara, Shreyas Punacha, Kartheek Hegde, C. L. Ahmed
Rizwan, Md Sabir Ali and K. M. Ajith | Dynamics and kinetics of phase transition for regular AdS black holes in
general relativity coupled to non-linear electrodynamics | 20 pages, 10 figures. Comments are welcome | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Employing the free energy landscape, we study the phase transition and its
dynamics for a class of regular black holes in Anti-de Sitter spacetime
governed by the coupling of non-linear electrodynamics, which reduces to
Hayward and Bardeen solutions for particular values of spacetime parameters.
The Fokker-Planck equ... | [
{
"created": "Mon, 21 Jun 2021 13:29:22 GMT",
"version": "v1"
}
] | 2021-06-22 | [
[
"Kumara",
"A. Naveena",
""
],
[
"Punacha",
"Shreyas",
""
],
[
"Hegde",
"Kartheek",
""
],
[
"Rizwan",
"C. L. Ahmed",
""
],
[
"Ali",
"Md Sabir",
""
],
[
"Ajith",
"K. M.",
""
]
] | Employing the free energy landscape, we study the phase transition and its dynamics for a class of regular black holes in Anti-de Sitter spacetime governed by the coupling of non-linear electrodynamics, which reduces to Hayward and Bardeen solutions for particular values of spacetime parameters. The Fokker-Planck equat... |
2203.05415 | Junji Jia | Shangjie Zhou, Muchun Chen, Junji Jia | Effect of electric interaction on the deflection and gravitational
lensing in the strong field limit | 15 pages, 8 figures; references added in v2 | Eur. Phys. J. C 83, 883 (2023) | 10.1140/epjc/s10052-023-12047-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The deflection angle $\Delta\phi$ of charged signals in general charged
spacetime in the strong field limit is analyzed in this work using a
perturbative method generalized from the neutral signal case. The solved
$\Delta\phi$ naturally contains the finite distance effect and takes a
quasi-power series form with a lo... | [
{
"created": "Thu, 10 Mar 2022 15:11:51 GMT",
"version": "v1"
},
{
"created": "Tue, 3 May 2022 20:43:09 GMT",
"version": "v2"
}
] | 2023-10-03 | [
[
"Zhou",
"Shangjie",
""
],
[
"Chen",
"Muchun",
""
],
[
"Jia",
"Junji",
""
]
] | The deflection angle $\Delta\phi$ of charged signals in general charged spacetime in the strong field limit is analyzed in this work using a perturbative method generalized from the neutral signal case. The solved $\Delta\phi$ naturally contains the finite distance effect and takes a quasi-power series form with a loga... |
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