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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1212.0484 | Alexey Toporensky | D. M. Chirkov, A. V. Toporensky | On stability of power-law solution in multidimensional Gauss-Bonnet
cosmology | 23 pages with 6 figures | null | 10.1134/S020228931304004X | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider dynamics of a flat anisotropic multidimensional cosmological
model in Gauss-Bonnet gravity in the presence of a homogeneous magnetic field.
In particular, we find conditions under which the known power-law vacuum
solution can be an attractor for the case with non-zero magnetic field. We also
describe a pa... | [
{
"created": "Mon, 3 Dec 2012 18:42:04 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Chirkov",
"D. M.",
""
],
[
"Toporensky",
"A. V.",
""
]
] | We consider dynamics of a flat anisotropic multidimensional cosmological model in Gauss-Bonnet gravity in the presence of a homogeneous magnetic field. In particular, we find conditions under which the known power-law vacuum solution can be an attractor for the case with non-zero magnetic field. We also describe a part... |
gr-qc/9803004 | Tsvi Piran | Shahar Hod and Tsvi Piran | Mass-Inflation in Dynamical Gravitational Collapse of a Charged
Scalar-Field | Latex, 13 pages including 4 figures, Revtex.sty | Phys.Rev.Lett. 81 (1998) 1554-1557 | 10.1103/PhysRevLett.81.1554 | null | gr-qc | null | We study the inner-structure of a charged black-hole which is formed from the
gravitational collapse of a self-gravitating charged scalar-field. Starting
with a regular spacetime, we follow the evolution through the formation of an
apparent horizon, a Cauchy horizon and a final central singularity. We find a
null, we... | [
{
"created": "Sun, 1 Mar 1998 16:45:10 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Hod",
"Shahar",
""
],
[
"Piran",
"Tsvi",
""
]
] | We study the inner-structure of a charged black-hole which is formed from the gravitational collapse of a self-gravitating charged scalar-field. Starting with a regular spacetime, we follow the evolution through the formation of an apparent horizon, a Cauchy horizon and a final central singularity. We find a null, weak... |
2407.12974 | David Keitel | David Keitel | False positives for gravitational lensing: the gravitational-wave
perspective | 14 pages, 2 figures, submitted to Philosophical Transactions of the
Royal Society special issue on Multi-Messenger Gravitational Lensing | null | null | LIGO-P2400196 | gr-qc astro-ph.HE physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For the first detection of a novel astrophysical phenomenon, scientific
standards are particularly high. Especially in a multi-messenger context, there
are also opportunity costs to follow-up observations on any detection claims.
So in searching for the still elusive lensed gravitational waves, care needs to
be taken... | [
{
"created": "Wed, 17 Jul 2024 19:41:35 GMT",
"version": "v1"
}
] | 2024-07-19 | [
[
"Keitel",
"David",
""
]
] | For the first detection of a novel astrophysical phenomenon, scientific standards are particularly high. Especially in a multi-messenger context, there are also opportunity costs to follow-up observations on any detection claims. So in searching for the still elusive lensed gravitational waves, care needs to be taken i... |
1510.02859 | Xin-Zhou Li | Ping Xi and Ping Li | Reexamining generalized Chaplygin gas with the sign-changeable
interaction | 6 pages, 7figures | Astrophys Space Sci 360 (2015) 3 | 10.1007/s10509-015-2512-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we reexamine the generalized Chaplygin gas (GCG) cosmology
with the sign-changeable interaction. The dynamical analysis show that there
exists de-Sitter attractors in this model, which means that the late-time
behaviors of the model is insensitive to the initial condition and thus
alleviates the coinci... | [
{
"created": "Sat, 10 Oct 2015 00:42:16 GMT",
"version": "v1"
}
] | 2015-10-13 | [
[
"Xi",
"Ping",
""
],
[
"Li",
"Ping",
""
]
] | In this paper, we reexamine the generalized Chaplygin gas (GCG) cosmology with the sign-changeable interaction. The dynamical analysis show that there exists de-Sitter attractors in this model, which means that the late-time behaviors of the model is insensitive to the initial condition and thus alleviates the coincide... |
0806.1277 | Terry Pilling | Richard T Hammond and Terry Pilling | Dark Entropy | 7 pages, 1 figure | null | null | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the consequences of a universe with a non-constant cosmological
term in Einstein's equations and find that the Bianchi identities reduce to the
first law of thermodynamics when cosmological term is identified as being
proportional to the entropy density of the universe. This means that
gravitating dark ene... | [
{
"created": "Sat, 7 Jun 2008 11:05:09 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Sep 2008 18:54:40 GMT",
"version": "v2"
}
] | 2008-09-04 | [
[
"Hammond",
"Richard T",
""
],
[
"Pilling",
"Terry",
""
]
] | We examine the consequences of a universe with a non-constant cosmological term in Einstein's equations and find that the Bianchi identities reduce to the first law of thermodynamics when cosmological term is identified as being proportional to the entropy density of the universe. This means that gravitating dark energ... |
1909.08420 | Hirotaka Yoshino | Hirotaka Yoshino, Keisuke Izumi, Tetsuya Shiromizu, Yoshimune Tomikawa | Transversely trapping surfaces: Dynamical version | 34 pages, 10 figures, figures improved, minor corrections, published
version | Prog. Theor. Exp. Phys. (2020) 023E02 | 10.1093/ptep/ptz161 | OCU-PHYS-510, AP-GR-157 | gr-qc astro-ph.GA | http://creativecommons.org/licenses/by/4.0/ | We propose new concepts, a dynamically transversely trapping surface (DTTS)
and a marginally DTTS, as indicators for a strong gravity region. A DTTS is
defined as a two-dimensional closed surface on a spacelike hypersurface such
that photons emitted from arbitrary points on it in transverse directions are
accelerated... | [
{
"created": "Wed, 18 Sep 2019 12:57:42 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Feb 2020 09:05:43 GMT",
"version": "v2"
}
] | 2020-02-26 | [
[
"Yoshino",
"Hirotaka",
""
],
[
"Izumi",
"Keisuke",
""
],
[
"Shiromizu",
"Tetsuya",
""
],
[
"Tomikawa",
"Yoshimune",
""
]
] | We propose new concepts, a dynamically transversely trapping surface (DTTS) and a marginally DTTS, as indicators for a strong gravity region. A DTTS is defined as a two-dimensional closed surface on a spacelike hypersurface such that photons emitted from arbitrary points on it in transverse directions are acceleratedly... |
1110.1310 | Plyatsko Roman | Roman Plyatsko, Oleksandr Stefanyshyn, Mykola Fenyk | Highly relativistic spinning particle starting near $r_{ph}^{(-)}$ in a
Kerr field | 10 pages, 12 figures | Phys. Rev. D 82, 044015 (2010) | 10.1103/PhysRevD.82.044015 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the Mathisson-Papapetrou-Dixon (MPD) equations, we investigate the
trajectories of a spinning particle starting near $r_{ph}^{(-)}$ in a Kerr
field and moving with the velocity close to the velocity of light
($r_{ph}^{(-)}$ is the Boyer-Lindquist radial coordinate of the
counter-rotation circular photon orbits)... | [
{
"created": "Thu, 6 Oct 2011 16:14:01 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Plyatsko",
"Roman",
""
],
[
"Stefanyshyn",
"Oleksandr",
""
],
[
"Fenyk",
"Mykola",
""
]
] | Using the Mathisson-Papapetrou-Dixon (MPD) equations, we investigate the trajectories of a spinning particle starting near $r_{ph}^{(-)}$ in a Kerr field and moving with the velocity close to the velocity of light ($r_{ph}^{(-)}$ is the Boyer-Lindquist radial coordinate of the counter-rotation circular photon orbits). ... |
0810.4914 | Laura Mersini-Houghton | L.Mersini-Houghton and F.Adams | Limitations of anthropic predictions for the cosmological constant
$\Lambda$: Cosmic Heat Death of Anthropic Observers | 7pgs, published | Class.Quant.Grav.25:165002,2008 | 10.1088/0264-9381/25/16/165002 | null | gr-qc astro-ph hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper investigates anthropic bounds on the vacuum energy $\Lambda$. We
first consider the possibility of cosmic observers existing at any random time
(including the future) for constant $\Lambda$, and take into account the
suppression of new structure formation as the universe approaches its eternal
DeSitter (DS... | [
{
"created": "Mon, 27 Oct 2008 19:41:08 GMT",
"version": "v1"
}
] | 2009-01-22 | [
[
"Mersini-Houghton",
"L.",
""
],
[
"Adams",
"F.",
""
]
] | This paper investigates anthropic bounds on the vacuum energy $\Lambda$. We first consider the possibility of cosmic observers existing at any random time (including the future) for constant $\Lambda$, and take into account the suppression of new structure formation as the universe approaches its eternal DeSitter (DS) ... |
gr-qc/0507140 | Stephen R. Lau | Stephen R. Lau | Analytic structure of radiation boundary kernels for blackhole
perturbations | revtex4, 14 pages, 12 figures, 3 tables | J.Math.Phys. 46 (2005) 102503 | 10.1063/1.2073287 | null | gr-qc | null | Exact outer boundary conditions for gravitational perturbations of the
Schwarzschild metric feature integral convolution between a time-domain
boundary kernel and each radiative mode of the perturbation. For both axial
(Regge-Wheeler) and polar (Zerilli) perturbations, we study the Laplace
transform of such kernels a... | [
{
"created": "Fri, 29 Jul 2005 17:35:36 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Lau",
"Stephen R.",
""
]
] | Exact outer boundary conditions for gravitational perturbations of the Schwarzschild metric feature integral convolution between a time-domain boundary kernel and each radiative mode of the perturbation. For both axial (Regge-Wheeler) and polar (Zerilli) perturbations, we study the Laplace transform of such kernels as ... |
0710.0606 | Balakin Alexander | A. B. Balakin | Extended Einstein-Maxwell model | 27 pages | Grav.Cosmol.13:163-177,2007 | null | null | gr-qc astro-ph hep-th | null | A self-consistent extended Einstein-Maxwell model for relativistic
non-stationary polarizable-magnetizable anisotropic media is presented. Based
on the analogy with relativistic extended irreversible (transient)
thermodynamics, the extended constitutive equations for the electrodynamics of
continua are formulated phe... | [
{
"created": "Tue, 2 Oct 2007 19:24:25 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Balakin",
"A. B.",
""
]
] | A self-consistent extended Einstein-Maxwell model for relativistic non-stationary polarizable-magnetizable anisotropic media is presented. Based on the analogy with relativistic extended irreversible (transient) thermodynamics, the extended constitutive equations for the electrodynamics of continua are formulated pheno... |
2107.01648 | Matthew Robbins | Matthew P. G. Robbins and Robert B. Mann | Anti-Hawking Phenomena around a Rotating BTZ Black Hole | 10 pages, 7 figures | null | 10.1103/PhysRevD.106.045018 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In both flat and curved spacetimes, there are weak and strong versions of the
anti-Unruh/anti-Hawking effects, in which the KMS field temperature is
anti-correlated with the response of a detector and its inferred temperature.
We investigate for the first time the effects on the weak and strong
anti-Hawking effects f... | [
{
"created": "Sun, 4 Jul 2021 14:30:55 GMT",
"version": "v1"
}
] | 2022-08-31 | [
[
"Robbins",
"Matthew P. G.",
""
],
[
"Mann",
"Robert B.",
""
]
] | In both flat and curved spacetimes, there are weak and strong versions of the anti-Unruh/anti-Hawking effects, in which the KMS field temperature is anti-correlated with the response of a detector and its inferred temperature. We investigate for the first time the effects on the weak and strong anti-Hawking effects for... |
2202.11708 | Sara Kanzi | Sara Kanzi, \.Izzet Sakall{\i} | Reply to "Comment on 'Greybody radiation and quasinormal modes of
Kerr-like black hole in Bumblebee gravity model' " | null | EUROPEAN PHYSICAL JOURNAL C 82, 93 (2022) | 10.1140/epjc/s10052-022-10044-2 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In our recent study Ref. [1]: Eur. Phys. J. C 81, 501 (2021) , the main goal
was to reveal the Lorentz symmetry breaking (LSB) effect in the rotating black
holes via the greybody factor and quasinormal mode analyzes. Ding et al. [2]
Kerr-like black hole solution of the bumblebee gravity model used in our paper
[1] ha... | [
{
"created": "Wed, 23 Feb 2022 12:27:56 GMT",
"version": "v1"
}
] | 2022-06-22 | [
[
"Kanzi",
"Sara",
""
],
[
"Sakallı",
"İzzet",
""
]
] | In our recent study Ref. [1]: Eur. Phys. J. C 81, 501 (2021) , the main goal was to reveal the Lorentz symmetry breaking (LSB) effect in the rotating black holes via the greybody factor and quasinormal mode analyzes. Ding et al. [2] Kerr-like black hole solution of the bumblebee gravity model used in our paper [1] has ... |
1808.07863 | Kartik Prabhu | Kartik Prabhu | Conservation of asymptotic charges from past to future null infinity:
Maxwell fields | v3: M=Misner in ADM; author thanks D for this correction! v2:
references updated, minor typos fixed, few explanatory comments added
(published in JHEP) v1: 33 pages, 2 figures | JHEP 2018 (2018) 113 | 10.1007/JHEP10(2018)113 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | On any asymptotically-flat spacetime, we show that the asymptotic symmetries
and charges of Maxwell fields on past null infinity can be related to those on
future null infinity as recently proposed by Strominger. We extend the
covariant formalism of Ashtekar and Hansen by constructing a 3-manifold of both
null and sp... | [
{
"created": "Thu, 23 Aug 2018 17:51:56 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Oct 2018 09:42:37 GMT",
"version": "v2"
},
{
"created": "Thu, 18 Oct 2018 19:08:32 GMT",
"version": "v3"
}
] | 2018-10-22 | [
[
"Prabhu",
"Kartik",
""
]
] | On any asymptotically-flat spacetime, we show that the asymptotic symmetries and charges of Maxwell fields on past null infinity can be related to those on future null infinity as recently proposed by Strominger. We extend the covariant formalism of Ashtekar and Hansen by constructing a 3-manifold of both null and spat... |
1702.01603 | Andronikos Paliathanasis | N. Dimakis, Alex Giacomini, Sameerah Jamal, Genly Leon and Andronikos
Paliathanasis | Noether symmetries and stability of ideal gas solution in Galileon
Cosmology | 14 pages, 4 figures; discussion improved; to appear in Phys. Rev. D | Phys. Rev. D 95, 064031 (2017) | 10.1103/PhysRevD.95.064031 | null | gr-qc astro-ph.CO hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A class of generalized Galileon cosmological models, which can be described
by a point-like Lagrangian, is considered in order to utilize Noether's Theorem
to determine conservation laws for the field equations. In the
Friedmann-Lema\^itre-Robertson-Walker universe, the existence of a nontrivial
conservation law indi... | [
{
"created": "Mon, 6 Feb 2017 13:11:32 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Mar 2017 19:05:17 GMT",
"version": "v2"
},
{
"created": "Fri, 3 Mar 2017 15:21:50 GMT",
"version": "v3"
}
] | 2017-03-23 | [
[
"Dimakis",
"N.",
""
],
[
"Giacomini",
"Alex",
""
],
[
"Jamal",
"Sameerah",
""
],
[
"Leon",
"Genly",
""
],
[
"Paliathanasis",
"Andronikos",
""
]
] | A class of generalized Galileon cosmological models, which can be described by a point-like Lagrangian, is considered in order to utilize Noether's Theorem to determine conservation laws for the field equations. In the Friedmann-Lema\^itre-Robertson-Walker universe, the existence of a nontrivial conservation law indica... |
1701.06892 | Muhammad Zubair | M. Zubair, Farzana Kousar, Saira Waheed | Reconstruction of Scalar Potentials in $f(R,R_{\alpha\beta}
R^{\alpha\beta},\phi)$ theory of gravity | 30 pages, 3 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we explore the nature of scalar field potential in $f(R,
R_{\alpha\beta} R^{\alpha\beta},\phi)$ gravity using a well-motivated
reconstruction scheme for flat FRW geometry. The beauty of this scheme lies in
the assumption that the Hubble parameter can be expressed in terms of scalar
field and vice versa... | [
{
"created": "Tue, 17 Jan 2017 09:07:29 GMT",
"version": "v1"
}
] | 2017-01-25 | [
[
"Zubair",
"M.",
""
],
[
"Kousar",
"Farzana",
""
],
[
"Waheed",
"Saira",
""
]
] | In this paper, we explore the nature of scalar field potential in $f(R, R_{\alpha\beta} R^{\alpha\beta},\phi)$ gravity using a well-motivated reconstruction scheme for flat FRW geometry. The beauty of this scheme lies in the assumption that the Hubble parameter can be expressed in terms of scalar field and vice versa. ... |
2405.19467 | Mohamed Ibrahim Nouh | Mohamed S. Aboueisha, Mohamed I. Nouh, Emad A-B. Abdel-Salam. Tarek M.
Kamel, Mohamed M. Beheary and Kamel A. K. Gadallah | Analysis of the Fractional Relativistic Polytropic Gas Sphere | null | Scientific Reports, 2023, 13, 14304 | null | null | gr-qc astro-ph.SR | http://creativecommons.org/licenses/by/4.0/ | Many stellar configurations, including white dwarfs, neutron stars, black
holes, supermassive stars, and star clusters, rely on relativistic effects. The
Tolman-Oppenheimer-Volkoff (TOV) equation of the polytropic gas sphere is
ultimately a hydrostatic equilibrium equation developed from the general
relativity framew... | [
{
"created": "Wed, 29 May 2024 19:24:54 GMT",
"version": "v1"
}
] | 2024-05-31 | [
[
"Aboueisha",
"Mohamed S.",
""
],
[
"Nouh",
"Mohamed I.",
""
],
[
"Kamel",
"Emad A-B. Abdel-Salam. Tarek M.",
""
],
[
"Beheary",
"Mohamed M.",
""
],
[
"Gadallah",
"Kamel A. K.",
""
]
] | Many stellar configurations, including white dwarfs, neutron stars, black holes, supermassive stars, and star clusters, rely on relativistic effects. The Tolman-Oppenheimer-Volkoff (TOV) equation of the polytropic gas sphere is ultimately a hydrostatic equilibrium equation developed from the general relativity framewor... |
1901.01202 | Sam Dolan Dr | Sam R. Dolan | Comment on "Geodesic dynamics on Chazy-Curzon spacetimes" | 7 pages, 1 figure. See also arXiv:1812.08663 | null | null | null | gr-qc nlin.CD | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent numerical results of Dubeibe et al. [arXiv:1812.08663] were
interpreted as hinting at the existence of a fourth constant of motion
(Carter's constant) for geodesics on Chazy-Curzon spacetimes. Here we show
that, to the contrary, the geodesic dynamics of the single-particle
Chazy-Curzon spacetime exhibit fe... | [
{
"created": "Fri, 4 Jan 2019 16:43:38 GMT",
"version": "v1"
}
] | 2019-01-07 | [
[
"Dolan",
"Sam R.",
""
]
] | The recent numerical results of Dubeibe et al. [arXiv:1812.08663] were interpreted as hinting at the existence of a fourth constant of motion (Carter's constant) for geodesics on Chazy-Curzon spacetimes. Here we show that, to the contrary, the geodesic dynamics of the single-particle Chazy-Curzon spacetime exhibit feat... |
2305.08554 | Jose Luis Jaramillo | Jos\'e Luis Jaramillo, Badri Krishnan, Carlos F. Sopuerta | Universality in Binary Black Hole Dynamics: An Integrability Conjecture | 17 pages, no figures. Essay awarded a honorable mention in the 2023
Gravity Research Foundation essay competition | null | null | null | gr-qc hep-th math-ph math.MP nlin.SI | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The waveform of a binary black hole coalescence appears to be both simple and
universal. In this essay we argue that the dynamics should admit a separation
into 'fast and slow' degrees of freedom, such that the latter are described by
an integrable system of equations, accounting for the simplicity and
universality o... | [
{
"created": "Mon, 15 May 2023 11:33:21 GMT",
"version": "v1"
}
] | 2023-05-16 | [
[
"Jaramillo",
"José Luis",
""
],
[
"Krishnan",
"Badri",
""
],
[
"Sopuerta",
"Carlos F.",
""
]
] | The waveform of a binary black hole coalescence appears to be both simple and universal. In this essay we argue that the dynamics should admit a separation into 'fast and slow' degrees of freedom, such that the latter are described by an integrable system of equations, accounting for the simplicity and universality of ... |
2203.13515 | Francesco Sannino | Emanuele Binetti, Manuel Del Piano, Stefan Hohenegger, Franco
Pezzella, Francesco Sannino | The Effective Theory of Quantum Black Holes | Revised version matching the published one | null | 10.1103/PhysRevD.106.046006 | CERN-TH-2022-048 | gr-qc hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We explore the quantum nature of black holes by introducing an effective
framework that takes into account deviations from the classical results. The
approach is based on introducing quantum corrections to the classical
Schwarzschild geometry in a way that is consistent with the physical scales of
the black hole and ... | [
{
"created": "Fri, 25 Mar 2022 09:04:40 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Apr 2022 07:25:14 GMT",
"version": "v2"
},
{
"created": "Sat, 6 Aug 2022 15:04:11 GMT",
"version": "v3"
}
] | 2022-09-14 | [
[
"Binetti",
"Emanuele",
""
],
[
"Del Piano",
"Manuel",
""
],
[
"Hohenegger",
"Stefan",
""
],
[
"Pezzella",
"Franco",
""
],
[
"Sannino",
"Francesco",
""
]
] | We explore the quantum nature of black holes by introducing an effective framework that takes into account deviations from the classical results. The approach is based on introducing quantum corrections to the classical Schwarzschild geometry in a way that is consistent with the physical scales of the black hole and it... |
2005.03434 | Jo\~ao L. Costa | Jo\~ao L. Costa | The formation of trapped surfaces in the gravitational collapse of
spherically symmetric scalar fields with a positive cosmological constant | 18 pages | null | null | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Given spherically symmetric characteristic initial data for the
Einstein-scalar field system with a positive cosmological constant, we provide
a criterion, in terms of the dimensionless size and dimensionless renormalized
mass content of an annular region of the data, for the formation of a future
trapped surface. Th... | [
{
"created": "Thu, 7 May 2020 13:03:27 GMT",
"version": "v1"
}
] | 2020-05-08 | [
[
"Costa",
"João L.",
""
]
] | Given spherically symmetric characteristic initial data for the Einstein-scalar field system with a positive cosmological constant, we provide a criterion, in terms of the dimensionless size and dimensionless renormalized mass content of an annular region of the data, for the formation of a future trapped surface. This... |
1512.07279 | Artyom Astashenok V | A.V. Astashenok and S.D. Odintsov | From neutron stars to quark stars in mimetic gravity | 13 pages, 6 figures, 3 tables | Phys. Rev. D 94, 063008 (2016) | 10.1103/PhysRevD.94.063008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Realistic models of neutron and quark stars in the framework of mimetic
gravity with Lagrange multiplier constraint are presented. We discuss the
effect of mimetic scalar aiming to describe dark matter on mass-radius relation
and the moment of inertia for slowly rotating relativistic stars. The
mass-radius relation a... | [
{
"created": "Tue, 22 Dec 2015 22:06:34 GMT",
"version": "v1"
}
] | 2016-09-28 | [
[
"Astashenok",
"A. V.",
""
],
[
"Odintsov",
"S. D.",
""
]
] | Realistic models of neutron and quark stars in the framework of mimetic gravity with Lagrange multiplier constraint are presented. We discuss the effect of mimetic scalar aiming to describe dark matter on mass-radius relation and the moment of inertia for slowly rotating relativistic stars. The mass-radius relation and... |
gr-qc/9904037 | Emulsion-Lab | S. Q. Wu and X. Cai | Exact Solutions to Sourceless Charged Massive Scalar Field Equation on
Kerr-Newman Background | 22 Pages, in LaTex, no figure, to appear in J. Math. Phys | J.Math.Phys. 40 (1999) 4538-4548 | 10.1063/1.532985 | null | gr-qc | null | The separated radial part of a sourceless massive complex scalar field
equation on the Kerr-Newman black hole background is shown to be a generalized
spin-weighted spheroidal wave equation of imaginary number order. While the
separated angular part is an ordinary spheroidal wave equation. General exact
solutions in i... | [
{
"created": "Thu, 15 Apr 1999 04:19:19 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Wu",
"S. Q.",
""
],
[
"Cai",
"X.",
""
]
] | The separated radial part of a sourceless massive complex scalar field equation on the Kerr-Newman black hole background is shown to be a generalized spin-weighted spheroidal wave equation of imaginary number order. While the separated angular part is an ordinary spheroidal wave equation. General exact solutions in int... |
2402.14171 | Marc Casals | Christiane Klein, Mojgan Soltani, Marc Casals and Stefan Hollands | Infinite quantum twisting at the Cauchy horizon of rotating black holes | 5 pages of main text plus 10 pages of Supplemental Material (merged
in one single file, in this version), 9 figures in total. Published in Phys.
Rev. Lett | Phys. Rev. Lett. 132, 121501 (2024) | 10.1103/PhysRevLett.132.121501 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a numerical calculation of the expectation value of the quantum
angular-momentum current flux density for a scalar field in the Unruh state
near the inner horizon of a Kerr-de Sitter black hole. Our results indicate
that this flux diverges as $V_-^{-1}$ in a suitable Kruskal coordinate such
that $V_-=0$ at... | [
{
"created": "Wed, 21 Feb 2024 23:20:07 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Mar 2024 23:05:46 GMT",
"version": "v2"
}
] | 2024-03-27 | [
[
"Klein",
"Christiane",
""
],
[
"Soltani",
"Mojgan",
""
],
[
"Casals",
"Marc",
""
],
[
"Hollands",
"Stefan",
""
]
] | We present a numerical calculation of the expectation value of the quantum angular-momentum current flux density for a scalar field in the Unruh state near the inner horizon of a Kerr-de Sitter black hole. Our results indicate that this flux diverges as $V_-^{-1}$ in a suitable Kruskal coordinate such that $V_-=0$ at t... |
1510.05522 | Peter K.F. Kuhfittig | Peter K.F. Kuhfittig | Stable wormholes on a noncommutative-geometry background admitting a
one-parameter group of conformal motions | 12 pages, 1 figure | Indian J. Phys., 90(7), 837-842 (2016) | 10.1007/s12648-015-0812-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When Morris and Thorne first proposed the possible existence of traversable
wormholes, they adopted the following strategy: maintain complete control over
the geometry, thereby leaving open the determination of the stress-energy
tensor. In this paper we determine this tensor by starting with a
noncommutative-geometry... | [
{
"created": "Mon, 19 Oct 2015 15:14:38 GMT",
"version": "v1"
},
{
"created": "Mon, 23 May 2016 18:33:56 GMT",
"version": "v2"
}
] | 2016-05-24 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | When Morris and Thorne first proposed the possible existence of traversable wormholes, they adopted the following strategy: maintain complete control over the geometry, thereby leaving open the determination of the stress-energy tensor. In this paper we determine this tensor by starting with a noncommutative-geometry b... |
1712.01404 | Nelson Velandia | Nelson Velandia-Heredia and Juan Manuel Tejeiro-Sarmiento | Numerical solution of Mathisson-Papapetrou-Dixon equations for spinning
test particles in a Kerr metric | 17 pages, 2 figures. arXiv admin note: substantial text overlap with
arXiv:1609.03630 | Momento, N\'umero 57, p.60-85, 2018 | 10.15446/mo.n57.73391 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we calculate some estimations of the gravitomagnetic clock
effect, taking into consideration not only the rotating gravitational field of
the central mass, but also the spin of the test particle, obtaining values for
$\Delta t=t_{+}-t_{-}=2.5212079035\times10^{-8} \textrm{s}$. We use the
formulation of M... | [
{
"created": "Mon, 4 Dec 2017 23:00:19 GMT",
"version": "v1"
},
{
"created": "Sat, 7 Apr 2018 22:31:43 GMT",
"version": "v2"
}
] | 2018-07-18 | [
[
"Velandia-Heredia",
"Nelson",
""
],
[
"Tejeiro-Sarmiento",
"Juan Manuel",
""
]
] | In this work we calculate some estimations of the gravitomagnetic clock effect, taking into consideration not only the rotating gravitational field of the central mass, but also the spin of the test particle, obtaining values for $\Delta t=t_{+}-t_{-}=2.5212079035\times10^{-8} \textrm{s}$. We use the formulation of Mat... |
1001.4173 | Salvatore Capozziello | S. Capozziello, M. De Laurentis, D. Vernieri | Neutrino oscillation phase dynamically induced by f(R)-gravity | 4 pages | null | 10.1142/S0217732310033025 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitational phase shift of neutrino oscillation can be discussed in the
framework of f(R)-gravity. We show that the shift of quantum mechanical phase
can depend on the given f(R)-theory that we choose. This fact is general and
could constitute a fundamental test to discriminate among the various
alternative rel... | [
{
"created": "Sat, 23 Jan 2010 17:11:58 GMT",
"version": "v1"
}
] | 2015-05-18 | [
[
"Capozziello",
"S.",
""
],
[
"De Laurentis",
"M.",
""
],
[
"Vernieri",
"D.",
""
]
] | The gravitational phase shift of neutrino oscillation can be discussed in the framework of f(R)-gravity. We show that the shift of quantum mechanical phase can depend on the given f(R)-theory that we choose. This fact is general and could constitute a fundamental test to discriminate among the various alternative relat... |
gr-qc/0104055 | null | S. Q. Wu and X. Cai | Hawking Radiation of Dirac Particles in a Variable-mass Kerr Space-time | 12 pages in 12pt Revtex, no figure, to appear in Gen. Rel. Grav.
Vol.33, No.7 (2001) | Gen.Rel.Grav. 33 (2001) 1181-1195; Erratum-ibid. 34 (2002)
2019-2019 | 10.1023/A:1012033317604 | null | gr-qc | null | Hawking effect of Dirac particles in a variable-mass Kerr space-time is
investigated by using a method called as the generalized tortoise coordinate
transformation. The location and the temperature of the event horizon of the
non-stationary Kerr black hole are derived. It is shown that the temperature
and the shape o... | [
{
"created": "Wed, 18 Apr 2001 02:29:07 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Wu",
"S. Q.",
""
],
[
"Cai",
"X.",
""
]
] | Hawking effect of Dirac particles in a variable-mass Kerr space-time is investigated by using a method called as the generalized tortoise coordinate transformation. The location and the temperature of the event horizon of the non-stationary Kerr black hole are derived. It is shown that the temperature and the shape of ... |
gr-qc/9902006 | Oscar Alejandro Reula | Oscar A. Reula | Exponential Decay for Small Non-Linear Perturbations of Expanding Flat
Homogeneous Cosmologies | null | Phys. Rev. D 60, 083507 (1999) | 10.1103/PhysRevD.60.083507 | FaMAF-GRG: 1/99 | gr-qc | null | It is shown that during expanding phases of flat homogeneous cosmologies all
small enough non-linear perturbations decay exponentially. This result holds
for a large class of perfect fluid equations of state, but notably not for very
``stiff'' fluids as the pure radiation case.
| [
{
"created": "Mon, 1 Feb 1999 17:25:00 GMT",
"version": "v1"
}
] | 2016-08-25 | [
[
"Reula",
"Oscar A.",
""
]
] | It is shown that during expanding phases of flat homogeneous cosmologies all small enough non-linear perturbations decay exponentially. This result holds for a large class of perfect fluid equations of state, but notably not for very ``stiff'' fluids as the pure radiation case. |
0704.1685 | Xin-Zhou Li | Xing-hua Jin, Xin-zhou Li and Dao-jun Liu | Gravitating Global k-monopole | 9 pages, 2 figures, references added, typos corrected, accepted by
Class. Quantum Grav | Class.Quant.Grav.24:2773-2780,2007 | 10.1088/0264-9381/24/11/001 | null | gr-qc | null | A gravitating global k-monopole produces a tiny gravitational field outside
the core in addition to a solid angular deficit in the k-field theory. As a new
feature, the gravitational field can be attractive or repulsive depending on
the non-canonical kinetic term.
| [
{
"created": "Fri, 13 Apr 2007 01:48:38 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Apr 2007 03:18:19 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Jin",
"Xing-hua",
""
],
[
"Li",
"Xin-zhou",
""
],
[
"Liu",
"Dao-jun",
""
]
] | A gravitating global k-monopole produces a tiny gravitational field outside the core in addition to a solid angular deficit in the k-field theory. As a new feature, the gravitational field can be attractive or repulsive depending on the non-canonical kinetic term. |
0902.3903 | Daniele Oriti | Daniele Oriti | Group field theory and simplicial quantum gravity | 14 pages, no figures; RevTex4; v2: definition of the model modified,
discussion extended and improved | Class.Quant.Grav.27:145017,2010 | 10.1088/0264-9381/27/14/145017 | ITP-UU-08/58, SPIN-08/45, AEI-2009-022 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new Group Field Theory for 4d quantum gravity. It incorporates
the constraints that give gravity from BF theory, and has quantum amplitudes
with the explicit form of simplicial path integrals for 1st order gravity. The
geometric interpretation of the variables and of the contributions to the
quantum ampl... | [
{
"created": "Mon, 23 Feb 2009 13:14:08 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Sep 2009 14:50:09 GMT",
"version": "v2"
}
] | 2014-11-18 | [
[
"Oriti",
"Daniele",
""
]
] | We present a new Group Field Theory for 4d quantum gravity. It incorporates the constraints that give gravity from BF theory, and has quantum amplitudes with the explicit form of simplicial path integrals for 1st order gravity. The geometric interpretation of the variables and of the contributions to the quantum amplit... |
0705.2388 | Carlo Rovelli | Jonathan Engle, Roberto Pereira, Carlo Rovelli | The loop-quantum-gravity vertex-amplitude | 6pages | Phys.Rev.Lett.99:161301,2007 | 10.1103/PhysRevLett.99.161301 | null | gr-qc | null | Spinfoam theories are hoped to provide the dynamics of non-perturbative loop
quantum gravity. But a number of their features remain elusive. The best
studied one -the euclidean Barrett-Crane model- does not have the boundary
state space needed for this, and there are recent indications that,
consequently, it may fail... | [
{
"created": "Wed, 16 May 2007 16:03:25 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Engle",
"Jonathan",
""
],
[
"Pereira",
"Roberto",
""
],
[
"Rovelli",
"Carlo",
""
]
] | Spinfoam theories are hoped to provide the dynamics of non-perturbative loop quantum gravity. But a number of their features remain elusive. The best studied one -the euclidean Barrett-Crane model- does not have the boundary state space needed for this, and there are recent indications that, consequently, it may fail t... |
2003.04236 | Francesco Belgiorno | F. Belgiorno, S.L. Cacciatori and A. Vigan\`o | Analogue Hawking Effect: a master equation | 26 pages, 2 figures. Published version. Title a bit changed in PRD | Phys. Rev. D 102, 105003 (2020) | 10.1103/PhysRevD.102.105003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider further on the problem of the analogue Hawking radiation. We
propose a fourth order ordinary differential equation, which allows to discuss
the problem of Hawking radiation in analogue gravity in a unified way,
encompassing fluids and dielectric media. In a suitable approximation,
involving weak dispersiv... | [
{
"created": "Mon, 9 Mar 2020 16:20:58 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Nov 2020 11:43:09 GMT",
"version": "v2"
}
] | 2020-11-25 | [
[
"Belgiorno",
"F.",
""
],
[
"Cacciatori",
"S. L.",
""
],
[
"Viganò",
"A.",
""
]
] | We consider further on the problem of the analogue Hawking radiation. We propose a fourth order ordinary differential equation, which allows to discuss the problem of Hawking radiation in analogue gravity in a unified way, encompassing fluids and dielectric media. In a suitable approximation, involving weak dispersive ... |
gr-qc/0411127 | Francois Limousin | Francois Limousin (LUTH), Dorota Gondek-Rosinska (LUTH, CAMK), Eric
Gourgoulhon (LUTH) | Last orbits of binary strange quark stars | 11 pages, 10 figures, improved conclusion and figures, references
added, accepted for publication in Phys. Rev. D | Phys.Rev.D71:064012,2005 | 10.1103/PhysRevD.71.064012 | null | gr-qc astro-ph | null | We present the first relativistic calculations of the final phase of inspiral
of a binary system consisting of two stars built predominantely of strange
quark matter (strange quark stars). We study the precoalescing stage within the
Isenberg-Wilson-Mathews approximation of general relativity using a multidomain
spect... | [
{
"created": "Fri, 26 Nov 2004 20:15:22 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Mar 2005 10:15:26 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Limousin",
"Francois",
"",
"LUTH"
],
[
"Gondek-Rosinska",
"Dorota",
"",
"LUTH, CAMK"
],
[
"Gourgoulhon",
"Eric",
"",
"LUTH"
]
] | We present the first relativistic calculations of the final phase of inspiral of a binary system consisting of two stars built predominantely of strange quark matter (strange quark stars). We study the precoalescing stage within the Isenberg-Wilson-Mathews approximation of general relativity using a multidomain spectra... |
0706.2891 | Steven Willison | F. Canfora, A. Giacomini, S. Willison | Some exact solutions with torsion in 5-D Einstein-Gauss-Bonnet gravity | 19 pages, LaTex, no figures. References added, notation clarified.
Accepted for publication on Physical Review D | Phys.Rev.D76:044021,2007 | 10.1103/PhysRevD.76.044021 | CECS-PHY-07/11 | gr-qc hep-th | null | Exact solutions with torsion in Einstein-Gauss-Bonnet gravity are derived.
These solutions have a cross product structure of two constant curvature
manifolds. The equations of motion give a relation for the coupling constants
of the theory in order to have solutions with nontrivial torsion. This relation
is not the C... | [
{
"created": "Tue, 19 Jun 2007 23:37:33 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Jul 2007 16:06:57 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Canfora",
"F.",
""
],
[
"Giacomini",
"A.",
""
],
[
"Willison",
"S.",
""
]
] | Exact solutions with torsion in Einstein-Gauss-Bonnet gravity are derived. These solutions have a cross product structure of two constant curvature manifolds. The equations of motion give a relation for the coupling constants of the theory in order to have solutions with nontrivial torsion. This relation is not the Che... |
gr-qc/0402048 | Branchina | Vincenzo Branchina, Alice Gasparini, Anna Rissone | Electronic contribution to the oscillations of a gravitational antenna | 25 pages, no figures | Phys.Rev. D70 (2004) 024004 | 10.1103/PhysRevD.70.024004 | null | gr-qc | null | We carefully analyse the contribution to the oscillations of a metallic
gravitational antenna due to the interaction between the electrons of the bar
and the incoming gravitational wave. To this end, we first derive the total
microscopic Hamiltonian of the wave-antenna system and then compute the
contribution to the ... | [
{
"created": "Wed, 11 Feb 2004 18:46:42 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Branchina",
"Vincenzo",
""
],
[
"Gasparini",
"Alice",
""
],
[
"Rissone",
"Anna",
""
]
] | We carefully analyse the contribution to the oscillations of a metallic gravitational antenna due to the interaction between the electrons of the bar and the incoming gravitational wave. To this end, we first derive the total microscopic Hamiltonian of the wave-antenna system and then compute the contribution to the at... |
2403.19942 | Jianbo Lu | Jianbo Lu, Shining Yang, Yuying Zhang, Liu Yang, Mou Xu | Research on high-frequency quasi-periodic oscillations in generalized
black-bounce spacetime | 20 pages, 8 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In order to solve problem of spacetime singularity in theoretical physics,
researchers proposed the regular black holes (BH). The generalized black-bounce
(GBB) spacetime, as a unified treatment of distinct kinds of geometries in the
framework of general relativity (e.g. regular BH and wormholes), has been
extensivel... | [
{
"created": "Fri, 29 Mar 2024 02:49:34 GMT",
"version": "v1"
}
] | 2024-04-01 | [
[
"Lu",
"Jianbo",
""
],
[
"Yang",
"Shining",
""
],
[
"Zhang",
"Yuying",
""
],
[
"Yang",
"Liu",
""
],
[
"Xu",
"Mou",
""
]
] | In order to solve problem of spacetime singularity in theoretical physics, researchers proposed the regular black holes (BH). The generalized black-bounce (GBB) spacetime, as a unified treatment of distinct kinds of geometries in the framework of general relativity (e.g. regular BH and wormholes), has been extensively ... |
gr-qc/0504126 | Marcelo Salgado | Alejandro Corichi, Ulises Nucamendi, Marcelo Salgado | Scalar hairy black holes and scalarons in the isolated horizons
formalism | 17 pages, 10 figures; revtex style; figures added; text updated to
match the published paper | Phys.Rev.D73:084002,2006 | 10.1103/PhysRevD.73.084002 | null | gr-qc | null | The Isolated Horizons (IH) formalism, together with a simple phenomenological
model for colored black holes has been used to predict non-trivial formulae
that relate the ADM mass of the solitons and hairy Black Holes of
Gravity-Matter system on the one hand, and several horizon properties of the
black holes in the ot... | [
{
"created": "Tue, 26 Apr 2005 00:54:31 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Aug 2006 23:23:01 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Corichi",
"Alejandro",
""
],
[
"Nucamendi",
"Ulises",
""
],
[
"Salgado",
"Marcelo",
""
]
] | The Isolated Horizons (IH) formalism, together with a simple phenomenological model for colored black holes has been used to predict non-trivial formulae that relate the ADM mass of the solitons and hairy Black Holes of Gravity-Matter system on the one hand, and several horizon properties of the black holes in the othe... |
1702.01688 | Mehdi Assanioussi | Mehdi Assanioussi, Jerzy Lewandowski, Ilkka M\"akinen | Time evolution in deparametrized models of loop quantum gravity | 23 pages, 18 figures | Phys. Rev. D 96, 024043 (2017) | 10.1103/PhysRevD.96.024043 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An important aspect in understanding the dynamics in the context of
deparametrized models of LQG is to obtain a sufficient control on the quantum
evolution generated by a given Hamiltonian operator. More specifically, we need
to be able to compute the evolution of relevant physical states and observables
with a relat... | [
{
"created": "Mon, 6 Feb 2017 16:26:53 GMT",
"version": "v1"
}
] | 2017-08-02 | [
[
"Assanioussi",
"Mehdi",
""
],
[
"Lewandowski",
"Jerzy",
""
],
[
"Mäkinen",
"Ilkka",
""
]
] | An important aspect in understanding the dynamics in the context of deparametrized models of LQG is to obtain a sufficient control on the quantum evolution generated by a given Hamiltonian operator. More specifically, we need to be able to compute the evolution of relevant physical states and observables with a relativ... |
2109.01867 | Changqing Liu Lcqliu | Changqing Liu, Li Tang, Jiliang Jing | Image of the Schwarzschild black hole pierced by a cosmic string with a
thin accretion disk | null | International Journal of Modern Physics D (2022) 2250041 | 10.1142/S0218271822500419 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the optical appearance of a thin accretion disk around a
Schwarzschild black hole pierced by a cosmic string with a semi-analytic method
of Luminet [11]. Direct and secondary images with different parameters observed
by a distant observer is plotted. The cosmic string parameter s can modify the
shape and siz... | [
{
"created": "Sat, 4 Sep 2021 13:47:31 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Sep 2021 12:48:07 GMT",
"version": "v2"
}
] | 2022-04-12 | [
[
"Liu",
"Changqing",
""
],
[
"Tang",
"Li",
""
],
[
"Jing",
"Jiliang",
""
]
] | We study the optical appearance of a thin accretion disk around a Schwarzschild black hole pierced by a cosmic string with a semi-analytic method of Luminet [11]. Direct and secondary images with different parameters observed by a distant observer is plotted. The cosmic string parameter s can modify the shape and size ... |
0904.2950 | Chen Songbai | Songbai Chen, Jiliang Jing | Dark energy model with higher derivative of Hubble parameter | 11 pages, 6 figures, the correct version accepted for publication in
PLB | Phys. Lett. B 679 (2009) 144-150 | 10.1016/j.physletb.2009.07.018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this letter we consider a dark energy model in which the energy density is
a function of the Hubble parameter $H$ and its derivative with respect to time
$\rho_{de}=3\alpha \ddot{H}H^{-1}+3\beta\dot{H}+3\gamma H^2$. The behavior of
the dark energy and the expansion history of the Universe depend heavily on the
par... | [
{
"created": "Mon, 20 Apr 2009 06:38:49 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Apr 2009 01:25:53 GMT",
"version": "v2"
},
{
"created": "Tue, 2 Jun 2009 09:02:00 GMT",
"version": "v3"
},
{
"created": "Thu, 16 Jul 2009 03:54:44 GMT",
"version": "v4"
}
] | 2015-05-13 | [
[
"Chen",
"Songbai",
""
],
[
"Jing",
"Jiliang",
""
]
] | In this letter we consider a dark energy model in which the energy density is a function of the Hubble parameter $H$ and its derivative with respect to time $\rho_{de}=3\alpha \ddot{H}H^{-1}+3\beta\dot{H}+3\gamma H^2$. The behavior of the dark energy and the expansion history of the Universe depend heavily on the param... |
gr-qc/9711003 | Robert Mann | H. Burton, R.B. Mann | Palatini Variational Principle for an Extended Einstein-Hilbert Action | 14 pages, LaTeX | Phys.Rev. D57 (1998) 4754-4759 | 10.1103/PhysRevD.57.4754 | WATPHYS TH-97/17 | gr-qc | null | We consider a Palatini variation on a generalized Einstein-Hilbert action. We
find that the Hilbert constraint, that the connection equals the Christoffel
symbol, arises only as a special case of this general action, while for
particular values of the coefficients of this generalized action, the
connection is complet... | [
{
"created": "Mon, 3 Nov 1997 18:15:40 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Burton",
"H.",
""
],
[
"Mann",
"R. B.",
""
]
] | We consider a Palatini variation on a generalized Einstein-Hilbert action. We find that the Hilbert constraint, that the connection equals the Christoffel symbol, arises only as a special case of this general action, while for particular values of the coefficients of this generalized action, the connection is completel... |
gr-qc/9701001 | Motoyuki Saijo | Motoyuki Saijo, Hisa-aki Shinkai and Kei-ichi Maeda | Gravitational Waves in Brans-Dicke Theory : Analysis by Test Particles
around a Kerr Black Hole | 24 pages, revtex, 18 figures are attached with ps files | Phys.Rev. D56 (1997) 785-797 | 10.1103/PhysRevD.56.785 | WU-AP/64/96 (Waseda Univ. Astrophysics) | gr-qc | null | Analyzing test particles falling into a Kerr black hole, we study
gravitational waves in Brans-Dicke theory of gravity. First we consider a test
particle plunging with a constant azimuthal angle into a rotating black hole
and calculate the waveform and emitted energy of both scalar and tensor modes
of gravitational r... | [
{
"created": "Wed, 1 Jan 1997 03:07:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Saijo",
"Motoyuki",
""
],
[
"Shinkai",
"Hisa-aki",
""
],
[
"Maeda",
"Kei-ichi",
""
]
] | Analyzing test particles falling into a Kerr black hole, we study gravitational waves in Brans-Dicke theory of gravity. First we consider a test particle plunging with a constant azimuthal angle into a rotating black hole and calculate the waveform and emitted energy of both scalar and tensor modes of gravitational rad... |
gr-qc/0307094 | Stephane Fay | Stephane Fay, Jean-Pierre Luminet | Isotropisation of flat homogeneous universes with scalar fields | 35 pages, 11 figures, higher-quality images are available on request
to steph.fay@wanadoo.fr, to be published in Class. Quant. Grav | Class.Quant.Grav. 21 (2004) 1849-1878 | 10.1088/0264-9381/21/7/009 | null | gr-qc astro-ph | null | Starting from an anisotropic flat cosmological model(Bianchi type $I$), we
show that conditions leading to isotropisation fall into 3 classes,
respectively 1, 2, 3. We look for necessary conditions such that a Bianchi type
$I$ model reaches a stable isotropic state due to the presence of several
massive scalar fields... | [
{
"created": "Mon, 21 Jul 2003 15:25:04 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Nov 2003 17:36:31 GMT",
"version": "v2"
},
{
"created": "Wed, 18 Feb 2004 12:45:13 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Fay",
"Stephane",
""
],
[
"Luminet",
"Jean-Pierre",
""
]
] | Starting from an anisotropic flat cosmological model(Bianchi type $I$), we show that conditions leading to isotropisation fall into 3 classes, respectively 1, 2, 3. We look for necessary conditions such that a Bianchi type $I$ model reaches a stable isotropic state due to the presence of several massive scalar fields m... |
gr-qc/9807034 | null | Reinoud J. Slagter (University of Amsterdam) | Self-Gravitating Non-Abelian Cosmic String Solution | 12 pages in REVTEX with 7 figures in postscript. To appear in PRD
nov.'98 | Phys.Rev. D59 (1999) 025009 | 10.1103/PhysRevD.59.025009 | null | gr-qc | null | The coupled Einstein-Yang-Mills equations on a time dependent axially
symmetric spacetime are investigated, without a priori any conditions on the
gauge field. There is numerical evidence for the existence of a regular
solution with the desired asymptotic features. Just as in the supermassive
abelian counterpart mode... | [
{
"created": "Wed, 15 Jul 1998 10:37:14 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Sep 1998 20:44:27 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Slagter",
"Reinoud J.",
"",
"University of Amsterdam"
]
] | The coupled Einstein-Yang-Mills equations on a time dependent axially symmetric spacetime are investigated, without a priori any conditions on the gauge field. There is numerical evidence for the existence of a regular solution with the desired asymptotic features. Just as in the supermassive abelian counterpart model,... |
1907.12083 | Eleonora Giovannetti | Eleonora Giovannetti and Giovanni Montani | Polymer representation of the Bianchi IX Cosmology in the Misner
variables | 14 pages, 6 figures | Phys. Rev. D 100, 104058 (2019) | 10.1103/PhysRevD.100.104058 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the Bianchi IX Universe in the Polymer Quantum Mechanics framework
by facing both semiclassical and purely quantum effects near the cosmological
singularity. We adopt Misner variables to describe the model dynamics, applying
the polymer paradigm simultaneously to the isotropic one (linked to the
Universe v... | [
{
"created": "Sun, 28 Jul 2019 14:00:38 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Nov 2019 17:43:59 GMT",
"version": "v2"
}
] | 2019-12-03 | [
[
"Giovannetti",
"Eleonora",
""
],
[
"Montani",
"Giovanni",
""
]
] | We analyze the Bianchi IX Universe in the Polymer Quantum Mechanics framework by facing both semiclassical and purely quantum effects near the cosmological singularity. We adopt Misner variables to describe the model dynamics, applying the polymer paradigm simultaneously to the isotropic one (linked to the Universe vol... |
2111.03338 | Simon Boudet | Flavio Bombacigno, Simon Boudet, Gonzalo J. Olmo, Giovanni Montani | Big-Bounce in projectively invariant Nieh-Yan models: the Bianchi I case | To appear in the Proceedings of the 16th Marcel Grossmann meeting
(5-10 July, 2021) | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We show that the Nieh-Yan topological invariant breaks projective symmetry
and loses its topological character in presence of non vanishing nonmetricity.
The notion of the Nieh-Yan topological invariant is then extended to the
generic metric-affine case, defining a generalized Nieh-Yan term, which allows
to recover t... | [
{
"created": "Fri, 5 Nov 2021 09:13:24 GMT",
"version": "v1"
}
] | 2021-11-08 | [
[
"Bombacigno",
"Flavio",
""
],
[
"Boudet",
"Simon",
""
],
[
"Olmo",
"Gonzalo J.",
""
],
[
"Montani",
"Giovanni",
""
]
] | We show that the Nieh-Yan topological invariant breaks projective symmetry and loses its topological character in presence of non vanishing nonmetricity. The notion of the Nieh-Yan topological invariant is then extended to the generic metric-affine case, defining a generalized Nieh-Yan term, which allows to recover top... |
1002.0138 | Viqar Husain | Viqar Husain, Andreas Kreienbuehl | Ultraviolet behavior in background independent quantum field theory | 8 pages, 5 figures | Phys. Rev. D 81 (2010) 084043 | 10.1103/PhysRevD.81.084043 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a background independent quantization of the scalar field that
provides an explicit realization of Fock-like states and associated operators
in a polymer Hilbert space. The vacuum expectation values of the commutator and
anti-commutator of the creation and annihilation operators become energy
dependent, a... | [
{
"created": "Sun, 31 Jan 2010 16:09:12 GMT",
"version": "v1"
}
] | 2015-09-16 | [
[
"Husain",
"Viqar",
""
],
[
"Kreienbuehl",
"Andreas",
""
]
] | We describe a background independent quantization of the scalar field that provides an explicit realization of Fock-like states and associated operators in a polymer Hilbert space. The vacuum expectation values of the commutator and anti-commutator of the creation and annihilation operators become energy dependent, and... |
1004.0917 | Hideki Maeda | Hideki Maeda | Gauss-Bonnet black holes with non-constant curvature horizons | 15 pages, 1 figure; v2, discussion clarified and references added;
v3, published version; v4, Eqs.(4.22)-(4.24) corrected, which do not change
Eqs.(4.25)-(4.27) | Phys.Rev.D81:124007,2010 | 10.1103/PhysRevD.81.124007 | CECS-PHY-10/05 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate static and dynamical n(\ge 6)-dimensional black holes in
Einstein-Gauss-Bonnet gravity of which horizons have the isometries of an
(n-2)-dimensional Einstein space with a condition on its Weyl tensor originally
given by Dotti and Gleiser. Defining a generalized Misner-Sharp quasi-local
mass that satisf... | [
{
"created": "Tue, 6 Apr 2010 18:14:29 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Apr 2010 18:37:48 GMT",
"version": "v2"
},
{
"created": "Thu, 3 Jun 2010 00:17:05 GMT",
"version": "v3"
},
{
"created": "Thu, 23 Dec 2010 22:56:50 GMT",
"version": "v4"
}
] | 2010-12-27 | [
[
"Maeda",
"Hideki",
""
]
] | We investigate static and dynamical n(\ge 6)-dimensional black holes in Einstein-Gauss-Bonnet gravity of which horizons have the isometries of an (n-2)-dimensional Einstein space with a condition on its Weyl tensor originally given by Dotti and Gleiser. Defining a generalized Misner-Sharp quasi-local mass that satisfie... |
2311.03860 | Bill Atkins | Bill Atkins, Gianmassimo Tasinato | Hidden conformal symmetries for black holes in modified gravity | 22 pages, no figures | null | 10.1103/PhysRevD.108.104070 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We determine hidden conformal symmetries behind the evolution equations of
black hole perturbations in a vector-tensor theory of gravity. Such hidden
symmetries are valid everywhere in the exterior region of a spherically
symmetric, asymptotically flat black hole geometry. They allow us to factorize
second order oper... | [
{
"created": "Tue, 7 Nov 2023 10:21:49 GMT",
"version": "v1"
}
] | 2023-12-04 | [
[
"Atkins",
"Bill",
""
],
[
"Tasinato",
"Gianmassimo",
""
]
] | We determine hidden conformal symmetries behind the evolution equations of black hole perturbations in a vector-tensor theory of gravity. Such hidden symmetries are valid everywhere in the exterior region of a spherically symmetric, asymptotically flat black hole geometry. They allow us to factorize second order operat... |
gr-qc/0211091 | Ettore Minguzzi | E. Minguzzi and A. Macdonald | Universal one-way light speed from a universal light speed over closed
paths | RevTex4, 6 pages, 2 figures, uses psfrag. New sections added,
discussion expanded | Found.Phys.Lett. 16 (2003) 593-604 | 10.1023/B:FOPL.0000012785.16203.52 | null | gr-qc physics.ed-ph | null | This paper gives two complete and elementary proofs that if the speed of
light over closed paths has a universal value $c$, then it is possible to
synchronize clocks in such a way that the one-way speed of light is c. The
first proof is an elementary version of a recent proof. The second provides
high precision exper... | [
{
"created": "Wed, 27 Nov 2002 10:03:11 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Dec 2002 14:21:18 GMT",
"version": "v2"
},
{
"created": "Wed, 1 Oct 2003 11:38:27 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Minguzzi",
"E.",
""
],
[
"Macdonald",
"A.",
""
]
] | This paper gives two complete and elementary proofs that if the speed of light over closed paths has a universal value $c$, then it is possible to synchronize clocks in such a way that the one-way speed of light is c. The first proof is an elementary version of a recent proof. The second provides high precision experim... |
1504.04844 | Guillermo Andree Oliva-Mercado | Guillermo Andree Oliva-Mercado, Javier Bonatti-Gonz\'alez, Iv\'an
Cordero-Garc\'ia, Francisco Frutos-Alfaro | A Visualization of Null Geodesics for the Bonnor Massive Dipole | 9 pages, 5 figures, Presented at XIX Simposio Internacional de
M\'etodos Matem\'aticos Aplicados a las Ciencias (19th International
Symposium of Mathematical Methods Applied to Sciences, XIX-SIMMAC) | Revista de Matem\'atica: Teor\'ia y Aplicaciones 2015 22(2)
255-264 | 10.15517/rmta.v22i2.20723 | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we simulate null geodesics for the Bonnor massive dipole metric
by implementing a symbolic-numerical algorithm in Sage and Python. This program
is also capable of visualizing in 3D, in principle, the geodesics for any given
metric. Geodesics are launched from a common point, collectively forming a cone
o... | [
{
"created": "Sun, 19 Apr 2015 16:11:21 GMT",
"version": "v1"
}
] | 2015-10-20 | [
[
"Oliva-Mercado",
"Guillermo Andree",
""
],
[
"Bonatti-González",
"Javier",
""
],
[
"Cordero-García",
"Iván",
""
],
[
"Frutos-Alfaro",
"Francisco",
""
]
] | In this work we simulate null geodesics for the Bonnor massive dipole metric by implementing a symbolic-numerical algorithm in Sage and Python. This program is also capable of visualizing in 3D, in principle, the geodesics for any given metric. Geodesics are launched from a common point, collectively forming a cone of ... |
0905.2263 | Roman Sverdlov | Roman Sverdlov | Ph.D. Thesis: Quantum Field Theory and Gravity in Causal Sets | 211 pages, no figures | R. Sverdlov; Quantum Field Theory and Gravity in Causal Sets; PhD
Thesis (University of Michigan 2009) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is is a copy of dissertation that I have submitted in defense of my
ph.d. thesis, with some minor changes that I have made since then. The goal of
the project is to generalize matter fields and their Lagrangians from regular
space time to causal sets.
| [
{
"created": "Thu, 14 May 2009 07:09:42 GMT",
"version": "v1"
}
] | 2012-06-15 | [
[
"Sverdlov",
"Roman",
""
]
] | This is is a copy of dissertation that I have submitted in defense of my ph.d. thesis, with some minor changes that I have made since then. The goal of the project is to generalize matter fields and their Lagrangians from regular space time to causal sets. |
1812.01076 | Cemsinan Deliduman | Oguzhan Kasikci and Cemsinan Deliduman | Gravitational Lensing in Weyl Gravity | 14 pages; v2: published version | Phys. Rev. D 100, 024019 (2019) | 10.1103/PhysRevD.100.024019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the deflection angle of light from a distant source by a galaxy
cluster in Weyl's conformal gravity. The general method of calculation is first
applied to calculate the deflection angle in Schwarzschild-de Sitter (Kottler)
spacetime. The deflection angle calculated in Kottler spacetime includes the
contr... | [
{
"created": "Mon, 3 Dec 2018 20:44:46 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Oct 2019 15:25:52 GMT",
"version": "v2"
}
] | 2019-10-18 | [
[
"Kasikci",
"Oguzhan",
""
],
[
"Deliduman",
"Cemsinan",
""
]
] | We calculate the deflection angle of light from a distant source by a galaxy cluster in Weyl's conformal gravity. The general method of calculation is first applied to calculate the deflection angle in Schwarzschild-de Sitter (Kottler) spacetime. The deflection angle calculated in Kottler spacetime includes the contrib... |
2403.13052 | Jorge Castelo Mourelle | Jorge Castelo Mourelle, Christoph Adam, Juan Calder\'on Bustillo,
Nicolas Sanchis-Gual | Rotating Fermion-Boson Stars | 19 pages, 8 figures. We have added the treatment of static solutions,
improved some discussions about the results, and corrected various typos | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Rotating fermion-boson stars are hypothetical celestial objects that consist
of both fermionic and bosonic matter interacting exclusively through gravity.
Bosonic fields are believed to arise in certain models of particle physics
describing dark matter and could accumulate within neutron stars, modifying
some of thei... | [
{
"created": "Tue, 19 Mar 2024 18:00:02 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Mar 2024 10:43:16 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Apr 2024 13:14:22 GMT",
"version": "v3"
},
{
"created": "Tue, 18 Jun 2024 14:17:42 GMT",
"version": "v4"
}
] | 2024-06-19 | [
[
"Mourelle",
"Jorge Castelo",
""
],
[
"Adam",
"Christoph",
""
],
[
"Bustillo",
"Juan Calderón",
""
],
[
"Sanchis-Gual",
"Nicolas",
""
]
] | Rotating fermion-boson stars are hypothetical celestial objects that consist of both fermionic and bosonic matter interacting exclusively through gravity. Bosonic fields are believed to arise in certain models of particle physics describing dark matter and could accumulate within neutron stars, modifying some of their ... |
1306.1943 | Mehrdad Farhoudi Prof. | Amir F. Bahrehbakhsh, Mehrdad Farhoudi, Hajar Vakili | Dark Energy From Fifth Dimensional Brans-Dicke Theory | 16 pages, 5 figures, 3 tables | Inter. J. Mod. Phys. D Vol. 22, No. 12 (2013) 1350070 (18 pages) | 10.1142/S0218271813500703 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Following the approach of the induced-matter theory, we investigate the
cosmological implications of a five-dimensional Brans-Dicke theory, and propose
to explain the acceleration of the universe. After inducing in a
four-dimensional hypersurface, we classify the energy-momentum tensor into two
parts in a way that, o... | [
{
"created": "Sat, 8 Jun 2013 16:58:32 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jul 2013 14:04:54 GMT",
"version": "v2"
}
] | 2013-07-10 | [
[
"Bahrehbakhsh",
"Amir F.",
""
],
[
"Farhoudi",
"Mehrdad",
""
],
[
"Vakili",
"Hajar",
""
]
] | Following the approach of the induced-matter theory, we investigate the cosmological implications of a five-dimensional Brans-Dicke theory, and propose to explain the acceleration of the universe. After inducing in a four-dimensional hypersurface, we classify the energy-momentum tensor into two parts in a way that, one... |
gr-qc/0506014 | Joel Franklin | S. Deser and J. Franklin | Birkhoff for Lovelock Redux | Submitted to CQG | Class.Quant.Grav.22:L103-L106,2005 | 10.1088/0264-9381/22/16/L03 | null | gr-qc hep-th | null | We show succinctly that all metric theories with second order field equations
obey Birkhoff's theorem: their spherically symmetric solutions are static.
| [
{
"created": "Thu, 2 Jun 2005 19:54:32 GMT",
"version": "v1"
}
] | 2010-11-05 | [
[
"Deser",
"S.",
""
],
[
"Franklin",
"J.",
""
]
] | We show succinctly that all metric theories with second order field equations obey Birkhoff's theorem: their spherically symmetric solutions are static. |
1302.1016 | Daniel Kennefick | Shasvath J. Kapadia, Daniel Kennefick and Kostas Glampedakis | Do floating orbits in extreme mass ratio binary black holes exist? | 11 pages, 7 Figures | null | 10.1103/PhysRevD.87.044050 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper examines the possibility of floating or non-decaying orbits for
extreme mass ratio binary black holes. In the adiabatic approximation, valid in
the extreme mass ratio case, if the orbital flux lost due to gravitational
radiation reaction is compensated for by the orbital flux gained from the spins
of the b... | [
{
"created": "Tue, 5 Feb 2013 12:51:41 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Kapadia",
"Shasvath J.",
""
],
[
"Kennefick",
"Daniel",
""
],
[
"Glampedakis",
"Kostas",
""
]
] | This paper examines the possibility of floating or non-decaying orbits for extreme mass ratio binary black holes. In the adiabatic approximation, valid in the extreme mass ratio case, if the orbital flux lost due to gravitational radiation reaction is compensated for by the orbital flux gained from the spins of the bla... |
1910.09980 | Farhad Darabi | H. Hadi, Y. Heydarzade, F. Darabi and K. Atazadeh | D-bound and Bekenstein bound for McVittie solution surrounded by dark
energy cosmological fields | 13 pages, Minor revision | Eur. Phys. J. Plus, 135:584, (2020) | 10.1140/epjp/s13360-020-00601-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The cosmological candidate fields for dark energy as quintessence, phantom
and cosmological constant, are studied in terms of an entropic hypothesis
imposed on the McVittie solution surrounded by dark energy. We certify this
hypothesis as "$D$-bound-Bekenstein bound identification" for dilute systems
and use it as a ... | [
{
"created": "Mon, 21 Oct 2019 09:44:53 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Dec 2020 16:04:01 GMT",
"version": "v2"
}
] | 2020-12-16 | [
[
"Hadi",
"H.",
""
],
[
"Heydarzade",
"Y.",
""
],
[
"Darabi",
"F.",
""
],
[
"Atazadeh",
"K.",
""
]
] | The cosmological candidate fields for dark energy as quintessence, phantom and cosmological constant, are studied in terms of an entropic hypothesis imposed on the McVittie solution surrounded by dark energy. We certify this hypothesis as "$D$-bound-Bekenstein bound identification" for dilute systems and use it as a cr... |
1409.4854 | Masashi Kuniyasu | Masashi Kuniyasu | New Solutions of the $2+1$ Dimensional Einstein Gravity Coupled to
Maxwell Power type Non Linear Electric field with Dilaton field | 6 pages, 3 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New solutions are derived in the $2+1$ gravity which is coupled to $|{\cal
F}|^k$ type non-linear electric field in Maxwell Power theory with dilaton
field. We obtain consistent solutions in general $k$ case. We also investigate
the behavior of the metric function with the space-time singularity. Then, we
found some ... | [
{
"created": "Wed, 17 Sep 2014 02:22:56 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Nov 2014 08:43:21 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Nov 2014 05:49:35 GMT",
"version": "v3"
},
{
"created": "Tue, 27 Jan 2015 07:12:17 GMT",
"version": "v4"
}
] | 2015-01-28 | [
[
"Kuniyasu",
"Masashi",
""
]
] | New solutions are derived in the $2+1$ gravity which is coupled to $|{\cal F}|^k$ type non-linear electric field in Maxwell Power theory with dilaton field. We obtain consistent solutions in general $k$ case. We also investigate the behavior of the metric function with the space-time singularity. Then, we found some bl... |
1511.00388 | Kartik Prabhu | Kartik Prabhu | The First Law of Black Hole Mechanics for Fields with Internal Gauge
Freedom | v4: 69 pages, shorter, less pedagogical version, updated references
(published in CQG). v3: minor typographic corrections (PhD thesis version).
v2: 80 pages, 1 figure, significant changes to presentation and text; added
Thm 1 and Thm2. v1: 64 pages, 1 figure | Class. Quantum Grav. 34 035011, 2017 | 10.1088/1361-6382/aa536b | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the first law of black hole mechanics for physical theories based
on a local, covariant and gauge-invariant Lagrangian where the dynamical fields
transform non-trivially under the action of internal gauge transformations. The
theories of interest include General Relativity formulated in terms of tetrads,
Ei... | [
{
"created": "Mon, 2 Nov 2015 05:50:42 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Jun 2016 21:22:14 GMT",
"version": "v2"
},
{
"created": "Tue, 13 Dec 2016 20:46:29 GMT",
"version": "v3"
},
{
"created": "Tue, 10 Jan 2017 20:47:21 GMT",
"version": "v4"
}
] | 2017-01-12 | [
[
"Prabhu",
"Kartik",
""
]
] | We derive the first law of black hole mechanics for physical theories based on a local, covariant and gauge-invariant Lagrangian where the dynamical fields transform non-trivially under the action of internal gauge transformations. The theories of interest include General Relativity formulated in terms of tetrads, Eins... |
gr-qc/0405054 | Yasuo Ezawa | Y.Ezawa, H.Iwasaki, Y.Ohkuwa, T.Uegaki, N.Yamada and T.Yano | Interpretation of the first order formalism of f(R)-type gravity and the
corresponding second order formalism | 7 pages, extended and revised version of gr-qc/0309010 | Nuovo Cim.B119:1141-1148,2004 | 10.1393/ncb/i2004-10127-5 | null | gr-qc | null | f(R)-type gravity in the first order formalism is interpreted as Einstein
gravity with non-minimal coupling arising from the use of unphysical frame.
Identification of the corresponding second order higher-curvature gravity in
the physical frame is proposed by requiring that the action is the same.
| [
{
"created": "Tue, 11 May 2004 11:53:34 GMT",
"version": "v1"
}
] | 2010-11-11 | [
[
"Ezawa",
"Y.",
""
],
[
"Iwasaki",
"H.",
""
],
[
"Ohkuwa",
"Y.",
""
],
[
"Uegaki",
"T.",
""
],
[
"Yamada",
"N.",
""
],
[
"Yano",
"T.",
""
]
] | f(R)-type gravity in the first order formalism is interpreted as Einstein gravity with non-minimal coupling arising from the use of unphysical frame. Identification of the corresponding second order higher-curvature gravity in the physical frame is proposed by requiring that the action is the same. |
1006.5118 | Vladimir S. Manko | F.J. Ernst, V.S. Manko and E. Ruiz | On interrelations between Sibgatullin's and Alekseev's approaches to the
construction of exact solutions of the Einstein-Maxwell equations | 7 pages, no figures, section II extended | J.Phys.Conf.Ser.229:012050,2010 | 10.1088/1742-6596/229/1/012050 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The integral equations involved in Alekseev's "monodromy transform" technique
are shown to be simple combinations of Sibgatullin's integral equations and
normalizing conditions. An additional complex conjugation introduced by
Alekseev in the integrands makes his scheme mathematically inconsistent;
besides, in the ele... | [
{
"created": "Sat, 26 Jun 2010 08:00:03 GMT",
"version": "v1"
}
] | 2010-12-17 | [
[
"Ernst",
"F. J.",
""
],
[
"Manko",
"V. S.",
""
],
[
"Ruiz",
"E.",
""
]
] | The integral equations involved in Alekseev's "monodromy transform" technique are shown to be simple combinations of Sibgatullin's integral equations and normalizing conditions. An additional complex conjugation introduced by Alekseev in the integrands makes his scheme mathematically inconsistent; besides, in the elect... |
gr-qc/0603087 | Domenico Giulini | Domenico Giulini | Some remarks on the notions of general covariance and background
independence | 26 pages, 3 figures. Contribution to ``An assessment of current
paradigms in the physics of fundamental interactions'', edited by I.O.
Stamatescu (Springer Verlag, to appear) | Lect.NotesPhys.721:105-120,2007 | 10.1007/978-3-540-71117-9_6 | Freiburg THEP-06/04 | gr-qc | null | In the first part of this paper I review some of the difficulties that seem
to obstruct generally valid definitions of "general covariance" and/or
"background independence" The second and more historical part deals with a
rather strange argument that Einstein put forward in his 1913 "Entwurf paper"
with M. Grossmann ... | [
{
"created": "Wed, 22 Mar 2006 14:59:24 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Giulini",
"Domenico",
""
]
] | In the first part of this paper I review some of the difficulties that seem to obstruct generally valid definitions of "general covariance" and/or "background independence" The second and more historical part deals with a rather strange argument that Einstein put forward in his 1913 "Entwurf paper" with M. Grossmann to... |
gr-qc/9505026 | Jorma Louko | Jorma Louko | Witten's 2+1 gravity on R x (Klein bottle) | 33 pages, REVTeX v3.0, 3 figures in a separate PostScript file | Class.Quant.Grav. 12 (1995) 2441-2468 | 10.1088/0264-9381/12/10/006 | WISC--MILW--95--TH--15 | gr-qc hep-th | null | Witten's formulation of 2+1 gravity is investigated on the nonorientable
three-manifold R x (Klein bottle). The gauge group is taken to consist of all
four components of the 2+1 Poincare group. We analyze in detail several
components of the classical solution space, and we show that from four of the
components one ca... | [
{
"created": "Wed, 17 May 1995 00:09:02 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Louko",
"Jorma",
""
]
] | Witten's formulation of 2+1 gravity is investigated on the nonorientable three-manifold R x (Klein bottle). The gauge group is taken to consist of all four components of the 2+1 Poincare group. We analyze in detail several components of the classical solution space, and we show that from four of the components one can ... |
2203.11215 | Olivier Minazzoli | Olivier Minazzoli | On the shortcomings of the Shapiro delay tests of the equivalence
principle | 2 pages. Contribution to the 2022 Gravitation session of the 56th
Rencontres de Moriond | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There are several shortcomings in the "standard" Shapiro delay tests of the
equivalence principle on cosmological scales \cite{minazzoli:2019pr}. Although
many people in the community already acknowledged this in the literature, and
proposed alternative ways to compare potential Shapiro delays over cosmological
scale... | [
{
"created": "Mon, 21 Mar 2022 16:54:40 GMT",
"version": "v1"
}
] | 2022-03-23 | [
[
"Minazzoli",
"Olivier",
""
]
] | There are several shortcomings in the "standard" Shapiro delay tests of the equivalence principle on cosmological scales \cite{minazzoli:2019pr}. Although many people in the community already acknowledged this in the literature, and proposed alternative ways to compare potential Shapiro delays over cosmological scales ... |
1602.02552 | Deng Wang | Guang Yang, Deng Wang, and Xinhe Meng | Diagnostics and future evolution analysis of the two parametric models | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we apply three diagnostics including $Om$, Statefinder
hierarchy and the growth rate of perturbations into discriminating the two
parametric models for the effective pressure with the $\Lambda$CDM model. By
using the $Om$ diagnostic, we find that both the model 1 and the model 2 can be
hardly distingui... | [
{
"created": "Mon, 8 Feb 2016 13:12:35 GMT",
"version": "v1"
}
] | 2016-02-09 | [
[
"Yang",
"Guang",
""
],
[
"Wang",
"Deng",
""
],
[
"Meng",
"Xinhe",
""
]
] | In this paper, we apply three diagnostics including $Om$, Statefinder hierarchy and the growth rate of perturbations into discriminating the two parametric models for the effective pressure with the $\Lambda$CDM model. By using the $Om$ diagnostic, we find that both the model 1 and the model 2 can be hardly distinguish... |
1607.06695 | Mahsa Sanati | Fatimah Shojai, Mahsa Sanati | Investigation of energy conditions in the vicinity of future
cosmological singularities | I withdraw this paper since my former supervisor require me to
withdraw this paper | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, considering the energy conditions we shall show that some of
the energy conditions are violated in the vicinity of future singularities with
the scale factor suggested by Dabrowski - Marosek.
| [
{
"created": "Thu, 21 Jul 2016 07:44:29 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Jul 2016 18:27:29 GMT",
"version": "v2"
}
] | 2016-07-27 | [
[
"Shojai",
"Fatimah",
""
],
[
"Sanati",
"Mahsa",
""
]
] | In this paper, considering the energy conditions we shall show that some of the energy conditions are violated in the vicinity of future singularities with the scale factor suggested by Dabrowski - Marosek. |
2008.02137 | Viktor T. Toth | J. W. Moffat and V. T. Toth | Applying Modified Gravity (MOG) to the Lensing and Einstein Ring in
Abell 3827 | 4 pages, 1 figure. Minor corrections. arXiv admin note: substantial
text overlap with arXiv:2006.12550 | Phys. Rev. D 103, 044045 (2021) | 10.1103/PhysRevD.103.044045 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The lensing and Einstein ring at the core of the galaxy cluster Abell 3827
are reproduced in the modified gravity theory MOG. The estimated effective
lensing mass $M_L=(1+\alpha)M_b=5.2\times 10^{12} M_\odot$ within $R=18.3$~kpc
for a baryon mass $M_b=1.0\times 10^{12} M_\odot$ within the same radius
produces the obs... | [
{
"created": "Tue, 4 Aug 2020 15:38:15 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Aug 2020 15:40:07 GMT",
"version": "v2"
}
] | 2021-02-24 | [
[
"Moffat",
"J. W.",
""
],
[
"Toth",
"V. T.",
""
]
] | The lensing and Einstein ring at the core of the galaxy cluster Abell 3827 are reproduced in the modified gravity theory MOG. The estimated effective lensing mass $M_L=(1+\alpha)M_b=5.2\times 10^{12} M_\odot$ within $R=18.3$~kpc for a baryon mass $M_b=1.0\times 10^{12} M_\odot$ within the same radius produces the obser... |
0911.2450 | Anil Zenginoglu C | Anil Zenginoglu | Asymptotics of Schwarzschild black hole perturbations | 9 pages, 8 figures; changed title, updated references, matches the
published version | Class.Quant.Grav.27:045015,2010 | 10.1088/0264-9381/27/4/045015 | CSCAMM-09-21 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study linear gravitational perturbations of Schwarzschild spacetime by
solving numerically Regge-Wheeler-Zerilli equations in time domain using
hyperboloidal surfaces and a compactifying radial coordinate. We stress the
importance of including the asymptotic region in the computational domain in
studies of gravita... | [
{
"created": "Thu, 12 Nov 2009 19:16:45 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Feb 2010 03:09:47 GMT",
"version": "v2"
}
] | 2010-03-26 | [
[
"Zenginoglu",
"Anil",
""
]
] | We study linear gravitational perturbations of Schwarzschild spacetime by solving numerically Regge-Wheeler-Zerilli equations in time domain using hyperboloidal surfaces and a compactifying radial coordinate. We stress the importance of including the asymptotic region in the computational domain in studies of gravitati... |
gr-qc/0203025 | Guillermo A. Mena Marugan | Saulo Carneiro and Guillermo A. Mena Marugan | An anisotropic cosmological model with isotropic background radiation | 4 pages; contribution to the Proceedings of the 24th Spanish
Relativity Meeting (ERE2001) | Lect.Notes Phys. 617 (2003) 302 | 10.1007/3-540-36973-2_17 | null | gr-qc astro-ph | null | We present an exact solution of Einstein equations that describes a Bianchi
type III spacetime with conformal expansion. The matter content is given by an
anisotropic scalar field and two perfect fluids representing dust and isotropic
radiation. Based on this solution, we construct a cosmological model that
respects ... | [
{
"created": "Thu, 7 Mar 2002 17:51:00 GMT",
"version": "v1"
}
] | 2013-11-11 | [
[
"Carneiro",
"Saulo",
""
],
[
"Marugan",
"Guillermo A. Mena",
""
]
] | We present an exact solution of Einstein equations that describes a Bianchi type III spacetime with conformal expansion. The matter content is given by an anisotropic scalar field and two perfect fluids representing dust and isotropic radiation. Based on this solution, we construct a cosmological model that respects th... |
gr-qc/9508052 | Larry Shepley | J M Pons (Univ Barcelona) & L C Shepley (Univ Texas Austin) | Evolutionary Laws, Initial Conditions, and Gauge Fixing in Constrained
Systems | 23 pages; plain TeX. To appear: Classical & Quantum Gravity | Class.Quant.Grav.12:1771-1790,1995 | 10.1088/0264-9381/12/7/018 | null | gr-qc | null | We describe in detail how to eliminate nonphysical degrees of freedom in the
Lagrangian and Hamiltonian formulations of a constrained system. Two important
and distinct steps in our method are the fixing of ambiguities in the dynamics
and the determination of inequivalent initial data. The Lagrangian discussion
is no... | [
{
"created": "Fri, 25 Aug 1995 16:35:32 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Pons",
"J M",
"",
"Univ Barcelona"
],
[
"Shepley",
"L C",
"",
"Univ Texas Austin"
]
] | We describe in detail how to eliminate nonphysical degrees of freedom in the Lagrangian and Hamiltonian formulations of a constrained system. Two important and distinct steps in our method are the fixing of ambiguities in the dynamics and the determination of inequivalent initial data. The Lagrangian discussion is nove... |
gr-qc/9312004 | null | G. L. Rcheulishvili | Conformal Killing Vectors in Five-Dimensional Space | 9 pages, LaTeX file, IHEP 93-121 | null | null | null | gr-qc | null | The solutions of generalized Killing equation have been obtained for line
element with initial $t^2 \oplus so(3)$ symmetry. The coefficients of the
metric $g$ corresponding to these vector fields are written down.
| [
{
"created": "Thu, 2 Dec 1993 13:26:26 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Rcheulishvili",
"G. L.",
""
]
] | The solutions of generalized Killing equation have been obtained for line element with initial $t^2 \oplus so(3)$ symmetry. The coefficients of the metric $g$ corresponding to these vector fields are written down. |
gr-qc/0002060 | Jose Wadih Maluf | J. W. Maluf and A. A. Sousa | Hamiltonian formulation of teleparallel theories of gravity in the time
gauge | 22 pages, Latex file, no figures | null | null | null | gr-qc | null | We consider the most general class of teleparallel theories of gravity
quadratic in the torsion tensor, and carry out a detailed investigation of its
Hamiltonian formulation in the time gauge. Such general class is given by a
three-parameter family of theories. A consistent implementation of the Legendre
transform re... | [
{
"created": "Wed, 16 Feb 2000 22:17:26 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Maluf",
"J. W.",
""
],
[
"Sousa",
"A. A.",
""
]
] | We consider the most general class of teleparallel theories of gravity quadratic in the torsion tensor, and carry out a detailed investigation of its Hamiltonian formulation in the time gauge. Such general class is given by a three-parameter family of theories. A consistent implementation of the Legendre transform redu... |
0706.2905 | Myungseok Yoon | Chang-Young Ee, Daeho Lee, and Myungseok Yoon | Entropy of Schwarzschild Black Holes on DGP Brane | 6 pages, 1 figure; to appear in J. Kor. Phys. Soc | J.Korean Phys.Soc. 51 (2007) 2091-2093 | null | null | gr-qc | null | We study the entropy of Schwarzschild black holes on DGP brane. The radius of
event horizon on DGP brane is obtained by a numerical method. It is smaller
than that of Einstein gravity in the conventional branch, and is larger in the
accelerated branch. However, the difference is very small. The entropy of the
black h... | [
{
"created": "Wed, 20 Jun 2007 03:29:54 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Nov 2007 05:32:31 GMT",
"version": "v2"
}
] | 2008-10-21 | [
[
"Ee",
"Chang-Young",
""
],
[
"Lee",
"Daeho",
""
],
[
"Yoon",
"Myungseok",
""
]
] | We study the entropy of Schwarzschild black holes on DGP brane. The radius of event horizon on DGP brane is obtained by a numerical method. It is smaller than that of Einstein gravity in the conventional branch, and is larger in the accelerated branch. However, the difference is very small. The entropy of the black hol... |
gr-qc/9904012 | Gravity Research Group | Alexander Burinskii and Giulio Magli | Kerr-Schild Approach to the Boosted Kerr Solution | 16 pages, LaTeX | Phys.Rev. D61 (2000) 044017 | 10.1103/PhysRevD.61.044017 | null | gr-qc hep-th | null | Using a complex representation of the Debney-Kerr-Schild (DKS) solutions and
the Kerr theorem we analyze the boosted Kerr geometries and give the exact and
explicit expressions for the metrics, the principal null congruences, the
coordinate systems and the location of the singularities for arbitrary value
and orienta... | [
{
"created": "Tue, 6 Apr 1999 13:33:26 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Burinskii",
"Alexander",
""
],
[
"Magli",
"Giulio",
""
]
] | Using a complex representation of the Debney-Kerr-Schild (DKS) solutions and the Kerr theorem we analyze the boosted Kerr geometries and give the exact and explicit expressions for the metrics, the principal null congruences, the coordinate systems and the location of the singularities for arbitrary value and orientati... |
1002.0524 | Panagiotis Kordas Dr | Panagiotis Kordas | Transition Matrix, Poisson Bracket for gravitational solitons in the
dressing formalism | 9 pages, Comments welcome, results explicitly expressed in
Introduction and abstract | null | null | null | gr-qc hep-th nlin.SI | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Hamiltonian methods of the theory of solitons are applied to
gravisolitons in the dressing formalism. The Poisson bracket for the
Lie-algebra valued one-form $A(\varsigma, \eta,
\gamma)=\Psi_{,\gamma}\Psi^{-1}$, for gravisolitons in the dressing formalism,
for a specific background solution, is defined and comput... | [
{
"created": "Tue, 2 Feb 2010 16:24:42 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Dec 2010 11:09:20 GMT",
"version": "v2"
},
{
"created": "Fri, 28 Jan 2011 18:15:01 GMT",
"version": "v3"
}
] | 2011-01-31 | [
[
"Kordas",
"Panagiotis",
""
]
] | The Hamiltonian methods of the theory of solitons are applied to gravisolitons in the dressing formalism. The Poisson bracket for the Lie-algebra valued one-form $A(\varsigma, \eta, \gamma)=\Psi_{,\gamma}\Psi^{-1}$, for gravisolitons in the dressing formalism, for a specific background solution, is defined and computed... |
1410.6065 | Andrew Scacco | Daniel Phillips, Andrew Scacco, and Andreas Albrecht | Holographic bounds and finite inflation | 14 pages, 10 figures | Phys. Rev. D 91, 043513 (2015) | 10.1103/PhysRevD.91.043513 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compare two holographic arguments that impose especially strong bounds on
the amount of inflation. One comes from the de Sitter Equilibrium cosmology and
the other from the work of Banks and Fischler. We find that simple versions of
these two approaches yield the same bound on the number of e-foldings. A
careful e... | [
{
"created": "Mon, 13 Oct 2014 22:02:45 GMT",
"version": "v1"
}
] | 2015-03-05 | [
[
"Phillips",
"Daniel",
""
],
[
"Scacco",
"Andrew",
""
],
[
"Albrecht",
"Andreas",
""
]
] | We compare two holographic arguments that impose especially strong bounds on the amount of inflation. One comes from the de Sitter Equilibrium cosmology and the other from the work of Banks and Fischler. We find that simple versions of these two approaches yield the same bound on the number of e-foldings. A careful exa... |
1203.5709 | T.G Zlosnik | H. F. Westman and T. G. Zlosnik | Gravity, Cartan geometry, and idealized waywisers | Some typos corrected and presentation cleaned up in places. Much of
the content of this paper may also be found in the larger and more recent
paper arXiv:1411.1679 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The primary aim of this paper is to provide a simple and concrete
interpretation of Cartan geometry in terms of the mathematics of idealized
waywisers. Waywisers, also called hodometers, are instruments traditionally
used to measure distances. The mathematical representation of an idealized
waywiser consists of a cho... | [
{
"created": "Mon, 26 Mar 2012 16:04:35 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Mar 2012 17:13:24 GMT",
"version": "v2"
},
{
"created": "Thu, 12 Apr 2012 21:08:08 GMT",
"version": "v3"
},
{
"created": "Mon, 16 Feb 2015 14:57:35 GMT",
"version": "v4"
}
] | 2015-02-17 | [
[
"Westman",
"H. F.",
""
],
[
"Zlosnik",
"T. G.",
""
]
] | The primary aim of this paper is to provide a simple and concrete interpretation of Cartan geometry in terms of the mathematics of idealized waywisers. Waywisers, also called hodometers, are instruments traditionally used to measure distances. The mathematical representation of an idealized waywiser consists of a choic... |
gr-qc/0602076 | Stefan Nobbenhuis | Gerard 't Hooft and Stefan Nobbenhuis | Invariance under complex transformations, and its relevance to the
cosmological constant problem | Some clarifications and references added | Class.Quant.Grav.23:3819-3832,2006 | 10.1088/0264-9381/23/11/009 | ITP-UU-06/06, SPIN-06/04 | gr-qc hep-th | null | In this paper we study a new symmetry argument that results in a vacuum state
with strictly vanishing vacuum energy. This argument exploits the well-known
feature that de Sitter and Anti- de Sitter space are related by analytic
continuation. When we drop boundary and hermiticity conditions on quantum
fields, we get a... | [
{
"created": "Mon, 20 Feb 2006 16:15:48 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Apr 2006 13:34:07 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Hooft",
"Gerard 't",
""
],
[
"Nobbenhuis",
"Stefan",
""
]
] | In this paper we study a new symmetry argument that results in a vacuum state with strictly vanishing vacuum energy. This argument exploits the well-known feature that de Sitter and Anti- de Sitter space are related by analytic continuation. When we drop boundary and hermiticity conditions on quantum fields, we get as ... |
gr-qc/9806109 | Kourosh Nozari | Reza Mansouri and Kourosh Nozari | Signature Change, Inflation, and the Cosmological Constant | 15 pages, Latex, no figures | null | null | IPM/P - 98/15 | gr-qc | null | Colombeau's generalized functions are used to adapt the distributional
approach to singular hypersurfaces in general relativity with signature change.
Equations governing the dynamics of singular hypersurface is obtained and it is
shown that matching leads to de Sitter space for the Lorentzian region. The
matching is... | [
{
"created": "Sat, 27 Jun 1998 06:57:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mansouri",
"Reza",
""
],
[
"Nozari",
"Kourosh",
""
]
] | Colombeau's generalized functions are used to adapt the distributional approach to singular hypersurfaces in general relativity with signature change. Equations governing the dynamics of singular hypersurface is obtained and it is shown that matching leads to de Sitter space for the Lorentzian region. The matching is p... |
2207.10202 | Tetsuya Shiromizu | Tetsuya Shiromizu, Keisuke Izumi, Kangjae Lee and Diego Soligon | Maximum size of black holes in our accelerating Universe | 8 pages, minor corrections, to apper in PRD | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In accordance with current models of the accelerating Universe as a spacetime
with a positive cosmological constant, new results about a cosmological upper
bound for the area of stable marginally outer trapped surfaces are found taking
into account angular momentum, gravitational waves and matter. Compared to
previou... | [
{
"created": "Wed, 20 Jul 2022 21:41:43 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Oct 2022 06:20:42 GMT",
"version": "v2"
}
] | 2022-10-11 | [
[
"Shiromizu",
"Tetsuya",
""
],
[
"Izumi",
"Keisuke",
""
],
[
"Lee",
"Kangjae",
""
],
[
"Soligon",
"Diego",
""
]
] | In accordance with current models of the accelerating Universe as a spacetime with a positive cosmological constant, new results about a cosmological upper bound for the area of stable marginally outer trapped surfaces are found taking into account angular momentum, gravitational waves and matter. Compared to previous ... |
1504.05818 | A. N. Ivanov | A. N. Ivanov and M. Wellenzohn | Standard Electroweak Interactions in Gravitational Theory with Chameleon
Field and Torsion | 26 pages, 8 figures | Phys. Rev. D 91, 085025 (2015) | 10.1103/PhysRevD.91.085025 | null | gr-qc hep-ph nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a version of a gravitational theory with the torsion field,
induced by the chameleon field. Following Hojman et al. Phys. Rev. D17, 3141
(1976) the results, obtained in Phys. Rev. D90, 045040 (2014), are generalised
by extending the Einstein gravity to the Einstein-Cartan gravity with the
torsion field as ... | [
{
"created": "Wed, 22 Apr 2015 14:18:49 GMT",
"version": "v1"
}
] | 2015-04-23 | [
[
"Ivanov",
"A. N.",
""
],
[
"Wellenzohn",
"M.",
""
]
] | We propose a version of a gravitational theory with the torsion field, induced by the chameleon field. Following Hojman et al. Phys. Rev. D17, 3141 (1976) the results, obtained in Phys. Rev. D90, 045040 (2014), are generalised by extending the Einstein gravity to the Einstein-Cartan gravity with the torsion field as a ... |
1312.7684 | Farook Rahaman | Farook Rahaman, Ayan Banerjee, Mubasher Jamil, Anil Kumar Yadav,
Humaira Idris | Noncommutative Wormholes in $f(R)$ Gravity with Lorentzian Distribution | 9 apges 4 groups of plots. Accepted in Int.J.Theor.Phys | Int.J.Theor.Phys. (2014) 53:1910-1919 | 10.1007/s10773-013-1993-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we derive some new exact solutions of static wormholes in
$f(R)$ gravity supported by the matter possesses Lorentizian density
distribution of a particle-like gravitational source. We derive the wormhole's
solutions in two possible schemes for a given Lorentzian distribution: assuming
an astrophysicall... | [
{
"created": "Mon, 30 Dec 2013 11:38:12 GMT",
"version": "v1"
}
] | 2015-01-28 | [
[
"Rahaman",
"Farook",
""
],
[
"Banerjee",
"Ayan",
""
],
[
"Jamil",
"Mubasher",
""
],
[
"Yadav",
"Anil Kumar",
""
],
[
"Idris",
"Humaira",
""
]
] | In this paper, we derive some new exact solutions of static wormholes in $f(R)$ gravity supported by the matter possesses Lorentizian density distribution of a particle-like gravitational source. We derive the wormhole's solutions in two possible schemes for a given Lorentzian distribution: assuming an astrophysically ... |
gr-qc/0607118 | Alvaro De La Cruz-Dombriz | A. de la Cruz-Dombriz and A. Dobado | A f(R) gravity without cosmological constant | 5 pages, no figures | Phys.Rev. D74 (2006) 087501 | 10.1103/PhysRevD.74.087501 | null | gr-qc | null | In this work we consider the possibility of describing the current evolution
of the universe, without the introduction of any cosmological constant or dark
energy (DE), by modifying the Einstein-Hilbert (EH) action. In the context of
the f(R) gravities within the metric formalism, we show that it is possible to
find ... | [
{
"created": "Wed, 26 Jul 2006 12:19:06 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"de la Cruz-Dombriz",
"A.",
""
],
[
"Dobado",
"A.",
""
]
] | In this work we consider the possibility of describing the current evolution of the universe, without the introduction of any cosmological constant or dark energy (DE), by modifying the Einstein-Hilbert (EH) action. In the context of the f(R) gravities within the metric formalism, we show that it is possible to find an... |
2211.03092 | Yakov Itin | Yakov Itin | Hilbert's energy-momentum tensor extended | null | null | null | null | gr-qc hep-th math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | A variational derivative of a Lagrangian with regard to the metric tensor is
used in classical field models to define Hilbert's energy-momentum tensor for a
matter field. In solid-state physics, constitutive relationships between
fundamental field variables are a topic that is covered by a broad variety of
models. In... | [
{
"created": "Sun, 6 Nov 2022 11:54:52 GMT",
"version": "v1"
}
] | 2022-11-08 | [
[
"Itin",
"Yakov",
""
]
] | A variational derivative of a Lagrangian with regard to the metric tensor is used in classical field models to define Hilbert's energy-momentum tensor for a matter field. In solid-state physics, constitutive relationships between fundamental field variables are a topic that is covered by a broad variety of models. In t... |
2107.12735 | Diego Cruces Mateo | Diego Cruces and Cristiano Germani | Stochastic inflation at all order in slow-roll parameters: foundations | 38 pages, 11 figures, typos corrected, ref added, results unchanged,
accepted in Physical Review D | null | 10.1103/PhysRevD.105.023533 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we develop the formalism for the stochastic approach to
inflation at all order in slow-roll parameters. This is done by including the
momentum and Hamiltonian constraints into the stochastic equations. We then
specialise to the widely used Starobinski approximation where interactions
between IR and UV m... | [
{
"created": "Tue, 27 Jul 2021 11:29:25 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jan 2022 20:12:10 GMT",
"version": "v2"
}
] | 2022-02-09 | [
[
"Cruces",
"Diego",
""
],
[
"Germani",
"Cristiano",
""
]
] | In this paper we develop the formalism for the stochastic approach to inflation at all order in slow-roll parameters. This is done by including the momentum and Hamiltonian constraints into the stochastic equations. We then specialise to the widely used Starobinski approximation where interactions between IR and UV mod... |
1411.1077 | Steffen Gielen | Steffen Gielen | Perturbing a quantum gravity condensate | 10 pages, APS style, revtex; v2: more discussion and references
added, unchanged results, v3: minor changes to match journal version | Phys. Rev. D 91, 043526 (2015) | 10.1103/PhysRevD.91.043526 | Imperial/TP/2014/SG/1 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent proposal using the group field theory approach, a spatially
homogeneous (generally anisotropic) universe is described as a quantum gravity
condensate of "atoms of space," which allows the derivation of an effective
cosmological Friedmann equation from the microscopic quantum gravity dynamics.
Here we take... | [
{
"created": "Tue, 4 Nov 2014 21:04:22 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Jan 2015 19:34:19 GMT",
"version": "v2"
},
{
"created": "Tue, 3 Feb 2015 19:40:25 GMT",
"version": "v3"
}
] | 2015-02-23 | [
[
"Gielen",
"Steffen",
""
]
] | In a recent proposal using the group field theory approach, a spatially homogeneous (generally anisotropic) universe is described as a quantum gravity condensate of "atoms of space," which allows the derivation of an effective cosmological Friedmann equation from the microscopic quantum gravity dynamics. Here we take a... |
1201.6672 | Abel Camacho Mr. | A. Camacho (Departamento de F\'isica, Universidad Aut\'onoma
Metropolitana--Iztapalapa, M\'exico) E. Castellanos (ZARM, Universit\"at
Bremen, Am Fallturm, Bremen, Germany) | Ultra--cold gases and the detection of the Earth's rotation: Bogoliubov
space and gravitomagnetism | 4 pages | null | 10.1142/S0217732312501982 | null | gr-qc cond-mat.quant-gas | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present work analyzes the consequences of the gravitomagnetic effect of
the Earth upon a bosonic gas in which the corresponding atoms have a
non--vanishing orbital angular momentum. Concerning the ground state of the
Bogoliubov space of this system we deduce the consequences, on the pressure and
on the speed of s... | [
{
"created": "Tue, 31 Jan 2012 20:23:05 GMT",
"version": "v1"
}
] | 2015-06-04 | [
[
"Camacho",
"A.",
"",
"Departamento de Física, Universidad Autónoma\n Metropolitana--Iztapalapa, México"
],
[
"Castellanos",
"E.",
"",
"ZARM, Universität\n Bremen, Am Fallturm, Bremen, Germany"
]
] | The present work analyzes the consequences of the gravitomagnetic effect of the Earth upon a bosonic gas in which the corresponding atoms have a non--vanishing orbital angular momentum. Concerning the ground state of the Bogoliubov space of this system we deduce the consequences, on the pressure and on the speed of sou... |
2210.00837 | Athanasios Lahanas | A. B. Lahanas | Issues in Palatini ${\cal{R}}^2$ inflation: Bounds on the Reheating
Temperature | 35 pages, 18 figures, PDFLaTeX, text and references added, typos
corrected | null | 10.1103/PhysRevD.106.123530 | null | gr-qc astro-ph.CO hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider ${\cal{R}}^2$-inflation in Palatini gravity, in the presence of
scalar fields coupled to gravity. These theories, in the Einstein frame, and
for one scalar field $h$, share common features with $K$ - inflation models. We
apply this formalism for the study of single-field inflationary models, whose
potenti... | [
{
"created": "Mon, 3 Oct 2022 11:55:34 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Oct 2022 10:50:00 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Dec 2022 10:09:08 GMT",
"version": "v3"
}
] | 2023-01-11 | [
[
"Lahanas",
"A. B.",
""
]
] | We consider ${\cal{R}}^2$-inflation in Palatini gravity, in the presence of scalar fields coupled to gravity. These theories, in the Einstein frame, and for one scalar field $h$, share common features with $K$ - inflation models. We apply this formalism for the study of single-field inflationary models, whose potential... |
0904.2546 | Pablo Hernan Pereyra | P. H. Pereyra | The Schwarzschild Static Cosmological Model | 10 pages, 5 figures | Int.J.Mod.Phys.D16:553-562,2007 | 10.1142/S0218271807010390 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present work describes an immersion in 5D of the interior Schwarzschild
solution of the general relativity equations. The model theory is defined in
the context of a flat 5D space time matter Minkowski model, using a Tolman like
technique, which shows via Lorentz transformations that the solution is
compatible wi... | [
{
"created": "Thu, 16 Apr 2009 17:36:23 GMT",
"version": "v1"
}
] | 2009-04-21 | [
[
"Pereyra",
"P. H.",
""
]
] | The present work describes an immersion in 5D of the interior Schwarzschild solution of the general relativity equations. The model theory is defined in the context of a flat 5D space time matter Minkowski model, using a Tolman like technique, which shows via Lorentz transformations that the solution is compatible with... |
0706.0466 | Aleksandar Mikovic | A. Mikovic | Spin Network Wavefunction and the Graviton Propagator | 8 pages | null | 10.1002/prop.200710522 | null | gr-qc | null | We show that if the flat-spacetime wavefunction in the spin network basis of
Loop Quantum Gravity has a large-spin asymptotics given by Rovelli's ansatz
then the corresponding graviton propagator has the correct large-distance
asymptotics nonperturbatively and independently of the spin foam model used to
describe the... | [
{
"created": "Mon, 4 Jun 2007 16:05:06 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Mikovic",
"A.",
""
]
] | We show that if the flat-spacetime wavefunction in the spin network basis of Loop Quantum Gravity has a large-spin asymptotics given by Rovelli's ansatz then the corresponding graviton propagator has the correct large-distance asymptotics nonperturbatively and independently of the spin foam model used to describe the e... |
1412.8124 | Sunil Maharaj | P. Mafa Takisa, S. D. Maharaj, Subharthi Ray | Stellar objects in the quadratic regime | 8 pages, Submitted for publication | Astrophys. Space Sci. 354: 463-470 (2014) | 10.1007/s10509-014-2120-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We model a charged anisotropic relativistic star with a quadratic equation of
state. Physical features of an exact solution of the Einstein-Maxwell system
are studied by incorporating the effect of the nonlinear term from the equation
of state. It is possible to regain the masses, radii and central densities for
a li... | [
{
"created": "Sun, 28 Dec 2014 07:29:05 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Takisa",
"P. Mafa",
""
],
[
"Maharaj",
"S. D.",
""
],
[
"Ray",
"Subharthi",
""
]
] | We model a charged anisotropic relativistic star with a quadratic equation of state. Physical features of an exact solution of the Einstein-Maxwell system are studied by incorporating the effect of the nonlinear term from the equation of state. It is possible to regain the masses, radii and central densities for a line... |
1905.02622 | Haryanto Siahaan | Haryanto M. Siahaan | Kerr-Sen-Taub-NUT spacetime and circular geodesics | 20 pages, 7 figures;V3, minor revisions; V2, refs added | null | 10.1140/epjc/s10052-020-08561-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a novel solution obeying classical equation of motion in the low
energy limit of heterotic string theory. The solution represents a rotating
mass with electric charge and gravitomagnetic monopole moment. The
corresponding conserved charges are discussed. We also study the test body
circular equatorial moti... | [
{
"created": "Tue, 7 May 2019 14:50:49 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Jun 2019 19:25:47 GMT",
"version": "v2"
},
{
"created": "Tue, 5 May 2020 09:05:17 GMT",
"version": "v3"
},
{
"created": "Sat, 23 May 2020 08:45:53 GMT",
"version": "v4"
}
] | 2020-12-02 | [
[
"Siahaan",
"Haryanto M.",
""
]
] | We present a novel solution obeying classical equation of motion in the low energy limit of heterotic string theory. The solution represents a rotating mass with electric charge and gravitomagnetic monopole moment. The corresponding conserved charges are discussed. We also study the test body circular equatorial motion... |
1507.01281 | Stanley P. Gudder | Stan Gudder | Inflation and Dirac in the Causal Set Approach to Discrete Quantum
Gravity | 23 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this approach to discrete quantum gravity the basic structural element is
a covariant causal set ($c$-causet). The geometry of a $c$-causet is described
by a shell-sequence that determines the discrete gravity of a universe. In this
growth model, universes evolve in discrete time by adding new vertices to their
ge... | [
{
"created": "Sun, 5 Jul 2015 21:55:14 GMT",
"version": "v1"
}
] | 2015-07-07 | [
[
"Gudder",
"Stan",
""
]
] | In this approach to discrete quantum gravity the basic structural element is a covariant causal set ($c$-causet). The geometry of a $c$-causet is described by a shell-sequence that determines the discrete gravity of a universe. In this growth model, universes evolve in discrete time by adding new vertices to their gene... |
gr-qc/0003068 | Pawel Zieba | W. Rudnicki, P. Zieba | On the strength of the Kerr singularity and cosmic censorship | RevTeX, 6 pages, no figures, to appear in Phys. Lett. A | Phys.Lett. A268 (2000) 228-234 | 10.1016/S0375-9601(00)00185-7 | null | gr-qc | null | It has been suggested by Israel that the Kerr singularity cannot be strong in
the sense of Tipler, for it tends to cause repulsive effects. We show here
that, contrary to that suggestion, nearly all null geodesics reaching this
singularity do in fact terminate in Tipler's strong curvature singularity.
Implications of... | [
{
"created": "Thu, 16 Mar 2000 14:06:42 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Rudnicki",
"W.",
""
],
[
"Zieba",
"P.",
""
]
] | It has been suggested by Israel that the Kerr singularity cannot be strong in the sense of Tipler, for it tends to cause repulsive effects. We show here that, contrary to that suggestion, nearly all null geodesics reaching this singularity do in fact terminate in Tipler's strong curvature singularity. Implications of t... |
1812.07168 | Pujian Mao | Pujian Mao and Xiaoning Wu | More on gravitational memory | v3: presentation improved, discussion extended, typos corrected,
refs. added v4: typos corrected | JHEP 05 (2019) 058 | 10.1007/JHEP05(2019)058 | CJQS-2019-014 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Two novel results for the gravitational memory effect are presented in this
paper. We first extend the formula for the memory effect to solutions with
arbitrary two surface boundary topology. The memory effect for the
Robinson-Trautman solution is obtained in its standard form. Then we propose a
new observational eff... | [
{
"created": "Tue, 18 Dec 2018 04:49:01 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jan 2019 05:47:36 GMT",
"version": "v2"
},
{
"created": "Fri, 10 May 2019 14:13:42 GMT",
"version": "v3"
},
{
"created": "Thu, 10 Oct 2019 05:59:02 GMT",
"version": "v4"
}
] | 2020-11-24 | [
[
"Mao",
"Pujian",
""
],
[
"Wu",
"Xiaoning",
""
]
] | Two novel results for the gravitational memory effect are presented in this paper. We first extend the formula for the memory effect to solutions with arbitrary two surface boundary topology. The memory effect for the Robinson-Trautman solution is obtained in its standard form. Then we propose a new observational effec... |
1011.3126 | Alexander Agathonov | Yurii Ignatyev and Alexander Agathonov | Exact Solutions of the Self-consistent System of Relativistic
Magnetohydrodynamics Equations for an Anisotropic Plasma on the Background of
Bondi-Pirani-Robinson's Metric | 20 pages | null | null | null | gr-qc physics.plasm-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Exact solutions of the self-consistent relativistic magnetohydrodynamics
equations for an anisotropic magnetized plasma on the background of
Bondi-Pirani-Robinson's vacuum plane gravitational wave (PGW) metric with an
arbitrary polarization are obtained, which generalize the results obtained
earlier by one of the aut... | [
{
"created": "Sat, 13 Nov 2010 11:28:32 GMT",
"version": "v1"
}
] | 2010-11-16 | [
[
"Ignatyev",
"Yurii",
""
],
[
"Agathonov",
"Alexander",
""
]
] | Exact solutions of the self-consistent relativistic magnetohydrodynamics equations for an anisotropic magnetized plasma on the background of Bondi-Pirani-Robinson's vacuum plane gravitational wave (PGW) metric with an arbitrary polarization are obtained, which generalize the results obtained earlier by one of the autho... |
1712.00577 | Inyong Cho | Inyong Cho | Fluid Black Holes with Electric Field | 11 pages, 6 figures. Version to appear in EPJC | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the gravitational field of static perfect-fluid in the
presence of electric field. We adopt the equation of state $p(r)=-\rho(r)/3$
for the fluid in order to consider the closed ($S_3$) or the open ($H_3$)
background spatial topology. Depending on the scales of the mass,
spatial-curvature and charge pa... | [
{
"created": "Sat, 2 Dec 2017 09:23:39 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Jan 2019 05:14:48 GMT",
"version": "v2"
}
] | 2019-01-21 | [
[
"Cho",
"Inyong",
""
]
] | We investigate the gravitational field of static perfect-fluid in the presence of electric field. We adopt the equation of state $p(r)=-\rho(r)/3$ for the fluid in order to consider the closed ($S_3$) or the open ($H_3$) background spatial topology. Depending on the scales of the mass, spatial-curvature and charge para... |
1308.2770 | Olivier Minazzoli | Olivier Minazzoli and Aur\'elien Hees | Intrinsic Solar System decoupling of a scalar-tensor theory with a
universal coupling between the scalar field and the matter Lagrangian | Accepted for publication in Phys. Rev. D. 6 pages | Phys. Rev. D 88, 041504 (2013) | 10.1103/PhysRevD.88.041504 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this communication, we present a class of Brans-Dicke-like theories with a
universal coupling between the scalar field and the matter Lagrangian. We show
this class of theories naturally exhibits a decoupling mechanism between the
scalar field and matter. As a consequence, this coupling leads to almost the
same ph... | [
{
"created": "Tue, 13 Aug 2013 07:10:42 GMT",
"version": "v1"
}
] | 2013-09-03 | [
[
"Minazzoli",
"Olivier",
""
],
[
"Hees",
"Aurélien",
""
]
] | In this communication, we present a class of Brans-Dicke-like theories with a universal coupling between the scalar field and the matter Lagrangian. We show this class of theories naturally exhibits a decoupling mechanism between the scalar field and matter. As a consequence, this coupling leads to almost the same phen... |
gr-qc/0107054 | Sergio M. C. V. Goncalves | Sergio M. C. V. Goncalves (Caltech) and Sanjay Jhingan (YITP, Japan) | Singularities in gravitational collapse with radial pressure | to appear in GRG; LaTeX, 22 pages, 2 eps figures | Gen.Rel.Grav.33:2125-2149,2001 | 10.1023/A:1015285531320 | null | gr-qc | null | We analyze spherical dust collapse with non-vanishing radial pressure, $\Pi$,
and vanishing tangential stresses. Considering a barotropic equation of state,
$\Pi=\gamma\rho$, we obtain an analytical solution in closed form---which is
exact for $\gamma=-1,0$, and approximate otherwise---near the center of
symmetry (wh... | [
{
"created": "Mon, 16 Jul 2001 10:51:41 GMT",
"version": "v1"
}
] | 2010-05-12 | [
[
"Goncalves",
"Sergio M. C. V.",
"",
"Caltech"
],
[
"Jhingan",
"Sanjay",
"",
"YITP, Japan"
]
] | We analyze spherical dust collapse with non-vanishing radial pressure, $\Pi$, and vanishing tangential stresses. Considering a barotropic equation of state, $\Pi=\gamma\rho$, we obtain an analytical solution in closed form---which is exact for $\gamma=-1,0$, and approximate otherwise---near the center of symmetry (wher... |
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