id stringlengths 9 13 | submitter stringlengths 1 64 ⌀ | authors stringlengths 5 22.9k | title stringlengths 4 245 | comments stringlengths 1 548 ⌀ | journal-ref stringlengths 4 362 ⌀ | doi stringlengths 12 82 ⌀ | report-no stringlengths 2 281 ⌀ | categories stringclasses 793
values | license stringclasses 9
values | orig_abstract stringlengths 24 1.95k | versions listlengths 1 30 | update_date stringlengths 10 10 | authors_parsed listlengths 1 1.74k | abstract stringlengths 21 1.95k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1208.1411 | Julien Larena | Jean-Philippe Bruneton and Julien Larena | Observables in a lattice Universe | 23 pages, 4 figures. Replaced to matched version accepted in Class.
Quantum Grav. Results unchanged but interpretation clarified | Class. Quantum Grav. 30 (2013) 025002 | 10.1088/0264-9381/30/2/025002 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore observables in a lattice Universe described by a recently found
solution to Einstein field equations. This solution models a regular lattice of
evenly distributed objects of equal masses. This inhomogeneous solution is
perturbative, and, up to second order in a small parameter, it expands at a
rate exactly... | [
{
"created": "Tue, 7 Aug 2012 12:40:40 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Dec 2012 11:05:10 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"Bruneton",
"Jean-Philippe",
""
],
[
"Larena",
"Julien",
""
]
] | We explore observables in a lattice Universe described by a recently found solution to Einstein field equations. This solution models a regular lattice of evenly distributed objects of equal masses. This inhomogeneous solution is perturbative, and, up to second order in a small parameter, it expands at a rate exactly e... |
2210.07427 | Marcony Silva Cunha | C. R. Muniz, H. R. Christiansen, M. S. Cunha, J. Furtado, V. B.
Bezerra | Scalar particles around a Rindler-Schwarzschild wormhole | 14 pages, 6 figures | Universe 2022, 8(12), 616 | 10.3390/universe8120616 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study quantum relativistic features of a scalar field
around the Rindler-Schwarzschild wormhole. First, we introduce this new class
of spacetime, investigating some energy conditions and verifying their
violation in a region nearby the wormhole throat, which means that the object
has to have an exot... | [
{
"created": "Fri, 14 Oct 2022 00:06:56 GMT",
"version": "v1"
}
] | 2022-11-29 | [
[
"Muniz",
"C. R.",
""
],
[
"Christiansen",
"H. R.",
""
],
[
"Cunha",
"M. S.",
""
],
[
"Furtado",
"J.",
""
],
[
"Bezerra",
"V. B.",
""
]
] | In this paper, we study quantum relativistic features of a scalar field around the Rindler-Schwarzschild wormhole. First, we introduce this new class of spacetime, investigating some energy conditions and verifying their violation in a region nearby the wormhole throat, which means that the object has to have an exotic... |
1104.4447 | Roshina Nandra Miss | Roshina Nandra, Anthony N. Lasenby and Michael P. Hobson | The effect of a massive object on an expanding universe | 14 pages, 2 tables, 5 figures; new version, to match the version
published in MNRAS | MNRAS, 422, 4, 2931-2944, 2012 | 10.1111/j.1365-2966.2012.20618.x | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A tetrad-based procedure is presented for solving Einstein's field equations
for spherically-symmetric systems; this approach was first discussed by Lasenby
et al. in the language of geometric algebra. The method is used to derive
metrics describing a point mass in a spatially-flat, open and closed expanding
universe... | [
{
"created": "Fri, 22 Apr 2011 14:25:38 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Jan 2012 16:11:38 GMT",
"version": "v2"
},
{
"created": "Tue, 22 May 2012 16:03:43 GMT",
"version": "v3"
}
] | 2015-05-27 | [
[
"Nandra",
"Roshina",
""
],
[
"Lasenby",
"Anthony N.",
""
],
[
"Hobson",
"Michael P.",
""
]
] | A tetrad-based procedure is presented for solving Einstein's field equations for spherically-symmetric systems; this approach was first discussed by Lasenby et al. in the language of geometric algebra. The method is used to derive metrics describing a point mass in a spatially-flat, open and closed expanding universe r... |
gr-qc/0611016 | Dinesh Singh | Dinesh Singh, Nader Mobed, Giorgio Papini | Reply to Comment on ``Can gravity distinguish between Dirac and Majorana
neutrinos?'' | 1 page, no figures, REVTeX | Phys.Rev.Lett.98:069002,2007 | 10.1103/PhysRevLett.98.069002 | null | gr-qc | null | This is a reply to a comment (gr-qc/0610098) written by Nieves and Pal about
our paper (gr-qc/0605153) published in Phys. Rev. Lett. 97, 041101 (2006).
| [
{
"created": "Fri, 3 Nov 2006 00:40:53 GMT",
"version": "v1"
}
] | 2008-12-18 | [
[
"Singh",
"Dinesh",
""
],
[
"Mobed",
"Nader",
""
],
[
"Papini",
"Giorgio",
""
]
] | This is a reply to a comment (gr-qc/0610098) written by Nieves and Pal about our paper (gr-qc/0605153) published in Phys. Rev. Lett. 97, 041101 (2006). |
gr-qc/9804044 | Lee Lindblom | Benjamin J. Owen, Lee Lindblom, Curt Cutler, Bernard F. Schutz,
Alberto Vecchio, Nils Andersson | Gravitational waves from hot young rapidly rotating neutron stars | 16 Pages, 10 Figures, Stochastic Background S/N Corrected, References
Added | Phys.Rev. D58 (1998) 084020 | 10.1103/PhysRevD.58.084020 | GRP 496 | gr-qc | null | Gravitational radiation drives an instability in the r-modes of young rapidly
rotating neutron stars. This instability is expected to carry away most of the
angular momentum of the star by gravitational radiation emission, leaving a
star rotating at about 100 Hz. In this paper we model in a simple way the
development... | [
{
"created": "Mon, 20 Apr 1998 18:16:52 GMT",
"version": "v1"
},
{
"created": "Mon, 4 May 1998 17:04:00 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Owen",
"Benjamin J.",
""
],
[
"Lindblom",
"Lee",
""
],
[
"Cutler",
"Curt",
""
],
[
"Schutz",
"Bernard F.",
""
],
[
"Vecchio",
"Alberto",
""
],
[
"Andersson",
"Nils",
""
]
] | Gravitational radiation drives an instability in the r-modes of young rapidly rotating neutron stars. This instability is expected to carry away most of the angular momentum of the star by gravitational radiation emission, leaving a star rotating at about 100 Hz. In this paper we model in a simple way the development o... |
2309.10535 | Ryotaku Suzuki | Shinya Tomizawa and Ryotaku Suzuki | Causality of Photon Propagation under Dominant Energy Condition in
Non-linear Electrodynamics | 14 pages | null | null | TTI-MATHPHYS-23 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, various types of regular black hole model are reintroduced as the
solution of the Einstein equations coupled with nonlinear electrodynamics
(NED). In NED, it is known that photons do not propagate along the null
geodesics of the spacetime geometry, but of so-called effective geometry, which
suggests the pos... | [
{
"created": "Tue, 19 Sep 2023 11:32:22 GMT",
"version": "v1"
}
] | 2023-09-20 | [
[
"Tomizawa",
"Shinya",
""
],
[
"Suzuki",
"Ryotaku",
""
]
] | Recently, various types of regular black hole model are reintroduced as the solution of the Einstein equations coupled with nonlinear electrodynamics (NED). In NED, it is known that photons do not propagate along the null geodesics of the spacetime geometry, but of so-called effective geometry, which suggests the possi... |
1401.7934 | Ahmet Baykal | Ahmet Baykal | Gravitational wave solutions of quadratic curvature gravity using a null
coframe formulation | Title rephrased, minor changes in the text. Conclusion expanded and
new references added | Phys. Rev. D 89, 064054 (2014) | 10.1103/PhysRevD.89.064054 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quadratic curvature gravity equations are projected to a complex null coframe
by using the algebra of exterior forms and expressed in terms of the spinor
quantities defined originally by Newman and Penrose. As an application, a new
family of impulsive gravitational wave solutions propagating in various type D
backgro... | [
{
"created": "Thu, 30 Jan 2014 17:49:52 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Mar 2014 04:33:17 GMT",
"version": "v2"
}
] | 2015-06-18 | [
[
"Baykal",
"Ahmet",
""
]
] | Quadratic curvature gravity equations are projected to a complex null coframe by using the algebra of exterior forms and expressed in terms of the spinor quantities defined originally by Newman and Penrose. As an application, a new family of impulsive gravitational wave solutions propagating in various type D backgroun... |
gr-qc/0305094 | Jian Qi Shen | Jian Qi Shen | On some weak-gravitational effects | 6 pages. Latex | null | null | null | gr-qc | null | Some physically interesting weak-gravitational effects and phenomena are
reviewed and briefly discussed: particle geometric phases due to the
time-dependent spin-rotation couplings, non-inertial gravitational wave in
rotating reference of frame, hyperbolical geometric quantum phases and
topological dual mass as well.... | [
{
"created": "Sun, 25 May 2003 10:03:37 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Shen",
"Jian Qi",
""
]
] | Some physically interesting weak-gravitational effects and phenomena are reviewed and briefly discussed: particle geometric phases due to the time-dependent spin-rotation couplings, non-inertial gravitational wave in rotating reference of frame, hyperbolical geometric quantum phases and topological dual mass as well. |
1412.7497 | Holger Frits Bech Nielsen | Astri Kleppe and Holger Bech Nielsen | Deriving diffeomorphism symmetry | This article were submitted as a contribution to the Bled Conference
on "What come beyond the Standard Models" organized by Norma Mankoc Borstnik,
Dragan Lukman, M.Khlopov and H. B. Nielsen | null | null | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In an earlier article, we have "derived" space, as a part of the Random
Dynamics project. In order to get locality we need to obtain reparametrization
symmetry, or equivalently, diffeomorphism symmetry. There we sketched a
procedure for how to get locality by first obtaining reparametrization
symmetry, or equivalentl... | [
{
"created": "Sun, 21 Dec 2014 21:57:24 GMT",
"version": "v1"
}
] | 2014-12-24 | [
[
"Kleppe",
"Astri",
""
],
[
"Nielsen",
"Holger Bech",
""
]
] | In an earlier article, we have "derived" space, as a part of the Random Dynamics project. In order to get locality we need to obtain reparametrization symmetry, or equivalently, diffeomorphism symmetry. There we sketched a procedure for how to get locality by first obtaining reparametrization symmetry, or equivalently,... |
1408.0468 | Ion I. Cotaescu | Ion I. Cotaescu | On anti-de Sitter oscillators and de Sitter anti-oscillators | 7 pages, no figures | null | null | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the principal arguments for interpreting the free quantum fields
on anti-de Sitter or de Sitter spacetimes of any dimensions as oscillators or
respectively anti-oscillators. In addition, we point out that there exists a
chart on the de Sitter background where the free Dirac field becomes a genuine
anti-osc... | [
{
"created": "Sun, 3 Aug 2014 07:50:55 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Aug 2014 11:10:51 GMT",
"version": "v2"
}
] | 2014-10-07 | [
[
"Cotaescu",
"Ion I.",
""
]
] | We revisit the principal arguments for interpreting the free quantum fields on anti-de Sitter or de Sitter spacetimes of any dimensions as oscillators or respectively anti-oscillators. In addition, we point out that there exists a chart on the de Sitter background where the free Dirac field becomes a genuine anti-oscil... |
1802.03267 | Neven Bili\'c | Neven Bili\'c and Hrvoje Nikoli\'c | Analog gravity in nonisentropic fluids | 15 pages, major revision to match the version accepted in CQG, a
section on planar black holes added, a few clarifications added, references
added, typos corrected | Class. Quant. Grav. 35 (2018) 135008 | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The analog acoustic metric has been originally derived for adiabatic acoustic
perturbations propagating in an isentropic irrotational ideal fluid. In the
framework of a Lagrangian hydrodynamic description we demonstrate that under
certain conditions the usual acoustic metric can be derived for nonisentropic
fluids. I... | [
{
"created": "Fri, 9 Feb 2018 14:13:36 GMT",
"version": "v1"
},
{
"created": "Tue, 29 May 2018 09:38:04 GMT",
"version": "v2"
}
] | 2019-03-07 | [
[
"Bilić",
"Neven",
""
],
[
"Nikolić",
"Hrvoje",
""
]
] | The analog acoustic metric has been originally derived for adiabatic acoustic perturbations propagating in an isentropic irrotational ideal fluid. In the framework of a Lagrangian hydrodynamic description we demonstrate that under certain conditions the usual acoustic metric can be derived for nonisentropic fluids. In ... |
2101.07508 | Francesco Marino | Marzena Ciszak and Francesco Marino | Acoustic black-hole bombs and scalar clouds in a photon-fluid model | 11 pages, 5 figures | Phys. Rev. D 103, 045004 (2021) | 10.1103/PhysRevD.103.045004 | null | gr-qc cond-mat.quant-gas physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Massive bosonic fields in the background of a Kerr black hole can either
trigger superradiant instabilities (black-hole bombs) or form equilibrium
configurations corresponding to pure bound states, known as stationary scalar
clouds. Here, similar phenomena are shown to emerge in the fluctuation dynamics
of a rotating... | [
{
"created": "Tue, 19 Jan 2021 08:36:59 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Feb 2021 12:33:14 GMT",
"version": "v2"
}
] | 2021-02-10 | [
[
"Ciszak",
"Marzena",
""
],
[
"Marino",
"Francesco",
""
]
] | Massive bosonic fields in the background of a Kerr black hole can either trigger superradiant instabilities (black-hole bombs) or form equilibrium configurations corresponding to pure bound states, known as stationary scalar clouds. Here, similar phenomena are shown to emerge in the fluctuation dynamics of a rotating p... |
1707.09101 | Nobuyoshi Komatsu | Nobuyoshi Komatsu | Thermodynamic constraints on a varying cosmological-constant-like term
from the holographic equipartition law with a power-law corrected entropy | Final version accepted for publication in PRD. Several pasragraphs
are added and revised. [9 pages, 2 figures] | Phys. Rev. D 96, 103507 (2017) | 10.1103/PhysRevD.96.103507 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A power-law corrected entropy based on a quantum entanglement is considered
to be a viable black-hole entropy. In this study, as an alternative to
Bekenstein-Hawking entropy, a power-law corrected entropy is applied to
Padmanabhan's holographic equipartition law to thermodynamically examine an
extra driving term in t... | [
{
"created": "Fri, 28 Jul 2017 04:17:35 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Oct 2017 23:00:19 GMT",
"version": "v2"
}
] | 2017-11-13 | [
[
"Komatsu",
"Nobuyoshi",
""
]
] | A power-law corrected entropy based on a quantum entanglement is considered to be a viable black-hole entropy. In this study, as an alternative to Bekenstein-Hawking entropy, a power-law corrected entropy is applied to Padmanabhan's holographic equipartition law to thermodynamically examine an extra driving term in the... |
1202.4807 | S. I. Kruglov | S. I. Kruglov | Born - Infeld-like modified gravity | RevTex, 5 pages, one figure, minor corrections, references added,
journal version, accepted in IJTP | Int. J. Theor. Physics (52) 2477-2484 (2013) | 10.1007/s10773-013-1535-1 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A modified theory of gravity with the function $F(R) = (1-\sqrt{1-2\lambda
R})/\lambda$ is suggested and analyzed. At small value of the parameter
$\lambda$ introduced the action is converted into Einstein$-$Hilbert action.
The theory is consistent with local tests which gives a bound on the value of
the parameter $\... | [
{
"created": "Wed, 22 Feb 2012 02:16:56 GMT",
"version": "v1"
},
{
"created": "Sat, 7 Apr 2012 16:03:37 GMT",
"version": "v2"
},
{
"created": "Wed, 13 Feb 2013 16:40:05 GMT",
"version": "v3"
}
] | 2013-06-04 | [
[
"Kruglov",
"S. I.",
""
]
] | A modified theory of gravity with the function $F(R) = (1-\sqrt{1-2\lambda R})/\lambda$ is suggested and analyzed. At small value of the parameter $\lambda$ introduced the action is converted into Einstein$-$Hilbert action. The theory is consistent with local tests which gives a bound on the value of the parameter $\la... |
1510.02853 | Yun Soo Myung | Yun Soo Myung | Phase transitions of the BTZ black hole in new massive gravity | 11 pages, 3 figures, published version to appear in Advanced in High
Energy Physics | Advances in High Energy Physics 2015 (2015) 478273 | 10.1155/2015/478273 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate thermodynamics of the BTZ black hole in new massive gravity
explicitly. For $m^2\ell^2>1/2$ with $m^2$ the mass parameter of fourth-order
terms and $\ell^2$ AdS$_3$ curvature radius, the Hawking-Page phase transition
occurs between the BTZ black hole and AdS (thermal) soliton. For
$m^2\ell^2<1/2$, howe... | [
{
"created": "Sat, 10 Oct 2015 00:06:16 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Nov 2015 23:42:29 GMT",
"version": "v2"
}
] | 2015-11-20 | [
[
"Myung",
"Yun Soo",
""
]
] | We investigate thermodynamics of the BTZ black hole in new massive gravity explicitly. For $m^2\ell^2>1/2$ with $m^2$ the mass parameter of fourth-order terms and $\ell^2$ AdS$_3$ curvature radius, the Hawking-Page phase transition occurs between the BTZ black hole and AdS (thermal) soliton. For $m^2\ell^2<1/2$, howeve... |
1409.7159 | Katherine Henriksson | Katherine Henriksson, Fran\c{c}ois Foucart, Lawrence E. Kidder, and
Saul A. Teukolsky | Initial data for high-compactness black hole-neutron star binaries | 9 pages, 4 Figures, Submitted to Phys. Rev. D | null | 10.1088/0264-9381/33/10/105009 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For highly compact neutron stars, constructing numerical initial data for
black hole-neutron star binary evolutions is very difficult. We describe
improvements to an earlier method that enable it to handle these more
challenging cases. We examine the case of a 6:1 mass ratio system in inspiral
close to merger, where ... | [
{
"created": "Thu, 25 Sep 2014 05:24:10 GMT",
"version": "v1"
}
] | 2016-10-26 | [
[
"Henriksson",
"Katherine",
""
],
[
"Foucart",
"François",
""
],
[
"Kidder",
"Lawrence E.",
""
],
[
"Teukolsky",
"Saul A.",
""
]
] | For highly compact neutron stars, constructing numerical initial data for black hole-neutron star binary evolutions is very difficult. We describe improvements to an earlier method that enable it to handle these more challenging cases. We examine the case of a 6:1 mass ratio system in inspiral close to merger, where th... |
gr-qc/0407011 | Lee Lindblom | Michael Holst, Lee Lindblom, Robert Owen, Harald P. Pfeiffer, Mark A.
Scheel, and Lawrence E. Kidder | Optimal Constraint Projection for Hyperbolic Evolution Systems | final version with minor changes; 16 pages, 14 figures | Phys.Rev. D70 (2004) 084017 | 10.1103/PhysRevD.70.084017 | null | gr-qc | null | Techniques are developed for projecting the solutions of symmetric hyperbolic
evolution systems onto the constraint submanifold (the constraint-satisfying
subset of the dynamical field space). These optimal projections map a field
configuration to the ``nearest'' configuration in the constraint submanifold,
where dis... | [
{
"created": "Fri, 2 Jul 2004 18:35:49 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Jul 2004 23:22:46 GMT",
"version": "v2"
},
{
"created": "Tue, 5 Oct 2004 22:36:45 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Holst",
"Michael",
""
],
[
"Lindblom",
"Lee",
""
],
[
"Owen",
"Robert",
""
],
[
"Pfeiffer",
"Harald P.",
""
],
[
"Scheel",
"Mark A.",
""
],
[
"Kidder",
"Lawrence E.",
""
]
] | Techniques are developed for projecting the solutions of symmetric hyperbolic evolution systems onto the constraint submanifold (the constraint-satisfying subset of the dynamical field space). These optimal projections map a field configuration to the ``nearest'' configuration in the constraint submanifold, where dista... |
gr-qc/0310093 | Dumitru Baleanu | Y.Guler, D.Baleanu, M.Cenk | Surface terms,angular momentum and Hamilton-Jacobi formalism | LATEX, 14Pages | Nuovo Cim. B118 (2003) 293-306 | null | null | gr-qc hep-th | null | Quadratic Lagrangians are introduced adding surface terms to a free particle
Lagrangian. Geodesic equations are used in the context of the Hamilton-Jacobi
formulation of constrained sysytem. Manifold structure induced by the quadratic
Lagrangian is investigated.
| [
{
"created": "Sun, 19 Oct 2003 10:48:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Guler",
"Y.",
""
],
[
"Baleanu",
"D.",
""
],
[
"Cenk",
"M.",
""
]
] | Quadratic Lagrangians are introduced adding surface terms to a free particle Lagrangian. Geodesic equations are used in the context of the Hamilton-Jacobi formulation of constrained sysytem. Manifold structure induced by the quadratic Lagrangian is investigated. |
2004.09214 | Subhash Chandra Mahapatra | Subhash Mahapatra | A note on the total action of $4D$ Gauss-Bonnet theory | 15 pages; general discussion extended; typos corrected; references
added. Published version | EPJC 80, 992 (2020) | 10.1140/epjc/s10052-020-08568-6 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, a novel four-dimensional Gauss-Bonnet theory has been suggested as
a limiting case of the original $D$-dimensional theory with singular
Gauss-Bonnet coupling constant $\alpha\rightarrow\alpha/(D-4)$. The theory is
proposed at the level of field equations. Here we analyse this theory at the
level of action. ... | [
{
"created": "Mon, 20 Apr 2020 11:32:46 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Nov 2020 05:47:38 GMT",
"version": "v2"
}
] | 2020-11-04 | [
[
"Mahapatra",
"Subhash",
""
]
] | Recently, a novel four-dimensional Gauss-Bonnet theory has been suggested as a limiting case of the original $D$-dimensional theory with singular Gauss-Bonnet coupling constant $\alpha\rightarrow\alpha/(D-4)$. The theory is proposed at the level of field equations. Here we analyse this theory at the level of action. We... |
1209.4859 | Manuel Rodrigues | M. E. Rodrigues, M. J. S. Houndjo, D. Saez-Gomez and F. Rahaman | Anisotropic Universe Models in f(T) Gravity | 16 pages, revtex4 format, version accepted for publication in
Physical Review D | Phys. Rev. D 86, 104059 (2012) | 10.1103/PhysRevD.86.104059 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the cosmological reconstruction in anisotropic universe for
both homogeneous and inhomogeneous content of the universe. Special attention
is attached to three interesting cases: Bianchi type-I, Bianchi type-III and
Kantowski-Sachs models. The de Sitter, power-law and general exponential
solutions are a... | [
{
"created": "Fri, 21 Sep 2012 16:31:31 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Sep 2012 19:45:18 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Nov 2012 16:29:23 GMT",
"version": "v3"
}
] | 2012-11-29 | [
[
"Rodrigues",
"M. E.",
""
],
[
"Houndjo",
"M. J. S.",
""
],
[
"Saez-Gomez",
"D.",
""
],
[
"Rahaman",
"F.",
""
]
] | We investigate the cosmological reconstruction in anisotropic universe for both homogeneous and inhomogeneous content of the universe. Special attention is attached to three interesting cases: Bianchi type-I, Bianchi type-III and Kantowski-Sachs models. The de Sitter, power-law and general exponential solutions are ass... |
2210.09032 | Patric de Gentile-Williams Mr | Patric de Gentile-Williams | Separating the Sources of Chaos in the Relativistic 3 Body Problem | 109 pages, 40 Figures, 54 Tables | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The dynamics of the Restricted 3 Body Problem in the Post Newtonian context
have been, and continue to be, studied extensively and a number of
characteristics such as ejections of bodies from the system, precession of
orbits, chaotic trajectories and collisions are investigated and classified. In
this paper, I examin... | [
{
"created": "Fri, 14 Oct 2022 14:18:53 GMT",
"version": "v1"
},
{
"created": "Sun, 5 Nov 2023 17:05:42 GMT",
"version": "v2"
}
] | 2023-11-07 | [
[
"de Gentile-Williams",
"Patric",
""
]
] | The dynamics of the Restricted 3 Body Problem in the Post Newtonian context have been, and continue to be, studied extensively and a number of characteristics such as ejections of bodies from the system, precession of orbits, chaotic trajectories and collisions are investigated and classified. In this paper, I examine ... |
1312.3204 | Eugeny Babichev | Eugeny Babichev and Christos Charmousis | Dressing a black hole with a time-dependent Galileon | v2: references added; v3: matches published version | JHEP 1408 (2014) 106 | 10.1007/JHEP08(2014)106 | LPT-ORSAY-13-105 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a class of exact scalar-tensor black holes for a shift-symmetric
part of the Horndeski action. The action includes a higher order scalar tensor
interaction term. We find that for a static and spherically symmetric
space-time, the scalar field, if time dependent, can be non-trivial and regular
thus circumve... | [
{
"created": "Wed, 11 Dec 2013 15:12:58 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Apr 2014 11:13:31 GMT",
"version": "v2"
},
{
"created": "Wed, 10 Sep 2014 18:57:42 GMT",
"version": "v3"
}
] | 2014-09-11 | [
[
"Babichev",
"Eugeny",
""
],
[
"Charmousis",
"Christos",
""
]
] | We present a class of exact scalar-tensor black holes for a shift-symmetric part of the Horndeski action. The action includes a higher order scalar tensor interaction term. We find that for a static and spherically symmetric space-time, the scalar field, if time dependent, can be non-trivial and regular thus circumvent... |
0812.4251 | Miguel Sabido | W. Guzm\'an, M. Sabido and J. Socorro | On Noncommutative Minisuperspace and the Friedmann equations | 4 pages, no figures, revtex | Phys.Lett.B697:271-274,2011 | 10.1016/j.physletb.2011.02.012 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we present noncommutative version of scalar field cosmology. We
find the noncommutative Friedmann equations as well as the noncommutative
Klein-Gordon equation. Interestingly the noncommutative contributions are only
present up to second order in the noncommutitive parameter. Finally we conclude
that if... | [
{
"created": "Mon, 22 Dec 2008 17:37:50 GMT",
"version": "v1"
}
] | 2011-03-02 | [
[
"Guzmán",
"W.",
""
],
[
"Sabido",
"M.",
""
],
[
"Socorro",
"J.",
""
]
] | In this paper we present noncommutative version of scalar field cosmology. We find the noncommutative Friedmann equations as well as the noncommutative Klein-Gordon equation. Interestingly the noncommutative contributions are only present up to second order in the noncommutitive parameter. Finally we conclude that if w... |
gr-qc/0001001 | Don Page | Don N. Page (CIAR and Department of Physics, University of Alberta) | Can Quantum Cosmology Give Observational Consequences of Many-Worlds
Quantum Theory? | LaTeX | null | 10.1063/1.1301589 | null | gr-qc | null | Although many people have thought that the difference between the Copenhagen
and many-worlds versions of quantum theory was merely metaphysical, quantum
cosmology may allow us to make a physical test to distinguish between them
empirically. The difference between the two versions shows up when the various
components ... | [
{
"created": "Sat, 1 Jan 2000 03:35:54 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Page",
"Don N.",
"",
"CIAR and Department of Physics, University of Alberta"
]
] | Although many people have thought that the difference between the Copenhagen and many-worlds versions of quantum theory was merely metaphysical, quantum cosmology may allow us to make a physical test to distinguish between them empirically. The difference between the two versions shows up when the various components of... |
gr-qc/0411006 | Tapas Kumar Das | Tapas Kumar Das | Transonic Black Hole Accretion as Analogue System | 20 pages. One figure. To be published in the Proceedings of the
Workshop on 'Dynamics and Thermodynamics of Black Holes and Naked
Singularities' (Milan, May 2004) | null | null | null | gr-qc astro-ph | null | Classical black hole analogues (alternatively, the analogue systems) are
fluid dynamical analogue of general relativistic black holes. Such analogue
effects may be observed when acoustic perturbations (sound waves) propagate
through a classical dissipation-less tran-sonic fluid. The acoustic horizon,
which resembles ... | [
{
"created": "Mon, 1 Nov 2004 14:09:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Das",
"Tapas Kumar",
""
]
] | Classical black hole analogues (alternatively, the analogue systems) are fluid dynamical analogue of general relativistic black holes. Such analogue effects may be observed when acoustic perturbations (sound waves) propagate through a classical dissipation-less tran-sonic fluid. The acoustic horizon, which resembles th... |
1812.05809 | Gustavo Enrique Garc\'ia De Jes\'us | Gustavo Garcia, and Marcelo Salgado | Obstructions towards a generalization of no-hair theorems: I. Scalar
clouds around Kerr black holes | 17 pages, 9 figures, 4 tables | Phys. Rev. D 99, 044036 (2019) | 10.1103/PhysRevD.99.044036 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the integral method used to prove the no-hair theorem for Black
Holes (BH's) in spherically symmetric and static spacetimes within the
framework of general relativity with matter composed by a complex-valued
scalar-field does not lead to a straightforward conclusion about the absence of
hair in the stati... | [
{
"created": "Fri, 14 Dec 2018 07:56:45 GMT",
"version": "v1"
}
] | 2019-02-27 | [
[
"Garcia",
"Gustavo",
""
],
[
"Salgado",
"Marcelo",
""
]
] | We show that the integral method used to prove the no-hair theorem for Black Holes (BH's) in spherically symmetric and static spacetimes within the framework of general relativity with matter composed by a complex-valued scalar-field does not lead to a straightforward conclusion about the absence of hair in the station... |
1911.02127 | Jean Pierre Gazeau | Herv\'e Bergeron, Ewa Czuchry, Jean-Pierre Gazeau, Przemys{\l}aw
Ma{\l}kiewicz | Quantum Mixmaster as a model of the Primordial Universe | 9 figures, Key words and phrases. quantum cosmology; mixmaster;
coherent states; quantization; semi-classical portraits; smooth bouncing | null | 10.3390/universe6010007 | null | gr-qc math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Mixmaster solution to Einstein field equations was examined by C. Misner
in an effort to better understand the dynamics of the early universe. We
highlight the importance of the quantum version of this model for early
universe. This quantum version and its semi-classical portraits are yielded
through affine and s... | [
{
"created": "Tue, 5 Nov 2019 23:00:14 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Nov 2019 14:49:26 GMT",
"version": "v2"
},
{
"created": "Mon, 23 Dec 2019 15:47:17 GMT",
"version": "v3"
}
] | 2020-02-03 | [
[
"Bergeron",
"Hervé",
""
],
[
"Czuchry",
"Ewa",
""
],
[
"Gazeau",
"Jean-Pierre",
""
],
[
"Małkiewicz",
"Przemysław",
""
]
] | The Mixmaster solution to Einstein field equations was examined by C. Misner in an effort to better understand the dynamics of the early universe. We highlight the importance of the quantum version of this model for early universe. This quantum version and its semi-classical portraits are yielded through affine and sta... |
0806.0679 | Tiberiu Harko | C. S. J. Pun, Z. Kovacs, T. Harko | Thin accretion disks in f(R) modified gravity models | 21 pages, 3 figures, accepted for publication in PRD | Phys.Rev.D78:024043,2008 | 10.1103/PhysRevD.78.024043 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the basic physical properties of matter forming a thin accretion
disc in the static and spherically symmetric space-time metric of the vacuum
$f(R)$ modified gravity models. The Lagrangian of the generalized gravity
theory is also obtained in a parametric form, and the conditions of the
viability of the m... | [
{
"created": "Wed, 4 Jun 2008 02:17:39 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Pun",
"C. S. J.",
""
],
[
"Kovacs",
"Z.",
""
],
[
"Harko",
"T.",
""
]
] | We consider the basic physical properties of matter forming a thin accretion disc in the static and spherically symmetric space-time metric of the vacuum $f(R)$ modified gravity models. The Lagrangian of the generalized gravity theory is also obtained in a parametric form, and the conditions of the viability of the mod... |
1503.03641 | Dmitry Litvinov | D. Litvinov, N. Bartel, K. Belousov, M. Bietenholz, A. Biriukov, A.
Fionov, A. Gusev, V. Kauts, A. Kovalenko, V. Kulagin, N. Poraiko, V. Rudenko | Gravitational Redshift Experiment with the Space Radio Telescope
RadioAstron | Proceedings of the Journ\'ees 2014 "Syst\`emes de r\'ef\'erence
spatio-temporels": Recent developments and prospects in ground-based and
space astrometry, Pulkovo Observatory, St. Petersburg, Russia, 22-24
September 2014 | null | null | null | gr-qc astro-ph.IM physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A unique test of general relativity is possible with the space radio
telescope RadioAstron. The ultra-stable on-board hydrogen maser frequency
standard and the highly eccentric orbit make RadioAstron an ideal instrument
for probing the gravitational redshift effect. Large gravitational potential
variation, occurring ... | [
{
"created": "Thu, 12 Mar 2015 09:27:44 GMT",
"version": "v1"
}
] | 2015-03-13 | [
[
"Litvinov",
"D.",
""
],
[
"Bartel",
"N.",
""
],
[
"Belousov",
"K.",
""
],
[
"Bietenholz",
"M.",
""
],
[
"Biriukov",
"A.",
""
],
[
"Fionov",
"A.",
""
],
[
"Gusev",
"A.",
""
],
[
"Kauts",
"V.",
... | A unique test of general relativity is possible with the space radio telescope RadioAstron. The ultra-stable on-board hydrogen maser frequency standard and the highly eccentric orbit make RadioAstron an ideal instrument for probing the gravitational redshift effect. Large gravitational potential variation, occurring on... |
gr-qc/9811059 | Yuri P. Goncharov | Yu. P. Goncharov (Sankt-Petersburg State Technical Unversity) | Dirac monopoles on Kerr black holes: comparing gauges | 18 pages, LaTeX with using the ijmpd1.sty file from the package of
World Scientific Publishing Co | Int.J.Mod.Phys. D8 (1999) 123-140 | 10.1142/S0218271899000110 | null | gr-qc | null | We update our previous work on the description of twisted configurations for
complex massless scalar field on the Kerr black holes as the sections of
complex line bundles over the Kerr black hole topology. From physical point of
view the appearance of twisted configurations is linked with the natural
presence of Dira... | [
{
"created": "Tue, 17 Nov 1998 23:00:36 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Goncharov",
"Yu. P.",
"",
"Sankt-Petersburg State Technical Unversity"
]
] | We update our previous work on the description of twisted configurations for complex massless scalar field on the Kerr black holes as the sections of complex line bundles over the Kerr black hole topology. From physical point of view the appearance of twisted configurations is linked with the natural presence of Dirac ... |
1210.8044 | Tiberiu Harko | Tiberiu Harko, Francisco S. N. Lobo | Geodesic deviation, Raychaudhuri equation, and tidal forces in modified
gravity with an arbitrary curvature-matter coupling | 10 pages, no figures; references added, accepted for publication in
PRD | Phys.Rev.D86:124034,2012 | 10.1103/PhysRevD.86.124034 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The geodesic deviation equation, describing the relative accelerations of
nearby particles, and the Raychaudhury equation, giving the evolution of the
kinematical quantities associated with deformations (expansion, shear and
rotation) are considered in the framework of modified theories of gravity with
an arbitrary c... | [
{
"created": "Sat, 27 Oct 2012 12:16:34 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Dec 2012 07:05:07 GMT",
"version": "v2"
}
] | 2012-12-20 | [
[
"Harko",
"Tiberiu",
""
],
[
"Lobo",
"Francisco S. N.",
""
]
] | The geodesic deviation equation, describing the relative accelerations of nearby particles, and the Raychaudhury equation, giving the evolution of the kinematical quantities associated with deformations (expansion, shear and rotation) are considered in the framework of modified theories of gravity with an arbitrary cur... |
0705.0548 | Carlos Augusto Romero Filho | Jose Edgar Madriz Aguilar, Carlos Romero and Adriano Barros | Modified Brans-Dicke theory of gravity from five-dimensional vacuum | 9 pages | Gen.Rel.Grav.40:117-130,2008 | 10.1007/s10714-007-0517-0 | null | gr-qc | null | We investigate, in the context of five-dimensional (5D) Brans-Dicke theory of
gravity, the idea that macroscopic matter configurations can be generated from
pure vacuum in five dimensions, an approach first proposed in the framework of
general relativity. We show that the 5D Brans-Dicke vacuum equations when
reduced ... | [
{
"created": "Thu, 3 May 2007 23:31:27 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Aguilar",
"Jose Edgar Madriz",
""
],
[
"Romero",
"Carlos",
""
],
[
"Barros",
"Adriano",
""
]
] | We investigate, in the context of five-dimensional (5D) Brans-Dicke theory of gravity, the idea that macroscopic matter configurations can be generated from pure vacuum in five dimensions, an approach first proposed in the framework of general relativity. We show that the 5D Brans-Dicke vacuum equations when reduced to... |
1008.2543 | \"Ozg\"ur Akarsu | Ozgur Akarsu, Can B. Kilinc | Some anisotropic universes in the presence of imperfect fluid coupling
with spatial curvature | 17 pages, no figures; to appear in International Journal of
Theoretical Physics; in this version (which is more concise) an equation
added, some references updated and added | International Journal of Theoretical Physics 50 (2011) 1962-1977 | 10.1007/s10773-011-0711-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider Bianchi VI spacetime, which also can be reduced to Bianchi types
VI0-V-III-I. We initially consider the most general form of the energy-momentum
tensor which yields anisotropic stress and heat flow. We then derive an
energy-momentum tensor that couples with the spatial curvature in a way so as
to cancel o... | [
{
"created": "Sun, 15 Aug 2010 19:03:54 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Feb 2011 13:28:08 GMT",
"version": "v2"
}
] | 2011-08-26 | [
[
"Akarsu",
"Ozgur",
""
],
[
"Kilinc",
"Can B.",
""
]
] | We consider Bianchi VI spacetime, which also can be reduced to Bianchi types VI0-V-III-I. We initially consider the most general form of the energy-momentum tensor which yields anisotropic stress and heat flow. We then derive an energy-momentum tensor that couples with the spatial curvature in a way so as to cancel out... |
1509.09010 | Kinjalk Lochan | Kinjalk Lochan, Sumanta Chakraborty | Discrete quantum spectrum of black holes | Matches the published version | Physics Letters B (2016), pp. 37-42 | 10.1016/j.physletb.2016.01.060 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quantum genesis of Hawking radiation is a long-standing puzzle in black
hole physics. Semi-classically one can argue that the spectrum of radiation
emitted by a black hole look very much sparse unlike what is expected from a
thermal object. It was demonstrated through a simple quantum model that a
quantum black h... | [
{
"created": "Wed, 30 Sep 2015 04:25:14 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Dec 2015 06:51:21 GMT",
"version": "v2"
},
{
"created": "Thu, 4 Feb 2016 04:53:03 GMT",
"version": "v3"
}
] | 2016-02-05 | [
[
"Lochan",
"Kinjalk",
""
],
[
"Chakraborty",
"Sumanta",
""
]
] | The quantum genesis of Hawking radiation is a long-standing puzzle in black hole physics. Semi-classically one can argue that the spectrum of radiation emitted by a black hole look very much sparse unlike what is expected from a thermal object. It was demonstrated through a simple quantum model that a quantum black hol... |
1608.06493 | Prado Martin-Moruno | Carlos Garc\'ia-Garc\'ia, Antonio L. Maroto, Prado Mart\'in-Moruno | Cosmology with moving bimetric fluids | V1: 26 pages, 20 figures. V2: 28 pages, 5 new references added, some
minor clarifications added. This version accepted for publication in JCAP | JCAP12(2016)022 | 10.1088/1475-7516/2016/12/022 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study cosmological implications of bigravity and massive gravity solutions
with non-simultaneously diagonal metrics by considering the generalized Gordon
and Kerr-Schild ansatzes. The scenario that we obtain is equivalent to that of
General Relativity with additional non-comoving perfect fluids. We show that
the m... | [
{
"created": "Tue, 23 Aug 2016 13:03:06 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Nov 2016 13:27:44 GMT",
"version": "v2"
}
] | 2016-12-21 | [
[
"García-García",
"Carlos",
""
],
[
"Maroto",
"Antonio L.",
""
],
[
"Martín-Moruno",
"Prado",
""
]
] | We study cosmological implications of bigravity and massive gravity solutions with non-simultaneously diagonal metrics by considering the generalized Gordon and Kerr-Schild ansatzes. The scenario that we obtain is equivalent to that of General Relativity with additional non-comoving perfect fluids. We show that the mos... |
gr-qc/0308069 | Patrick Brady | The LIGO Scientific Collaboration: B.Abbott, et al | Analysis of LIGO data for gravitational waves from binary neutron stars | 17 pages, 9 figures | Phys.Rev.D69:122001,2004 | 10.1103/PhysRevD.69.122001 | null | gr-qc | null | We report on a search for gravitational waves from coalescing compact binary
systems in the Milky Way and the Magellanic Clouds. The analysis uses data
taken by two of the three LIGO interferometers during the first LIGO science
run and illustrates a method of setting upper limits on inspiral event rates
using interf... | [
{
"created": "Thu, 21 Aug 2003 13:58:21 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"The LIGO Scientific Collaboration",
"",
""
],
[
"Abbott",
"B.",
""
]
] | We report on a search for gravitational waves from coalescing compact binary systems in the Milky Way and the Magellanic Clouds. The analysis uses data taken by two of the three LIGO interferometers during the first LIGO science run and illustrates a method of setting upper limits on inspiral event rates using interfer... |
2111.02660 | Kota Numajiri | Kota Numajiri, Taishi Katsuragawa, and Shin'ichi Nojiri | Compact Star in General $F(R)$ Gravity: Inevitable Degeneracy Problem
and Non-Integer Power Correction | 14 pages. Typos are corrected | Phys. Lett. B 826 (2022) 136929 | 10.1016/j.physletb.2022.136929 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We investigate a compact star in the general $F(R)$ gravity. Developing a
novel formulation in the spherically symmetric and static space-time with the
matter, we confirm that an arbitrary relation between the mass $M$ and the
radius $R_s$ of the compact star can be realized by adjusting the functional
form of $F(R)$... | [
{
"created": "Thu, 4 Nov 2021 06:57:40 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Nov 2021 11:36:21 GMT",
"version": "v2"
},
{
"created": "Sun, 30 Jan 2022 07:28:18 GMT",
"version": "v3"
},
{
"created": "Sun, 16 Oct 2022 10:36:35 GMT",
"version": "v4"
}
] | 2022-10-18 | [
[
"Numajiri",
"Kota",
""
],
[
"Katsuragawa",
"Taishi",
""
],
[
"Nojiri",
"Shin'ichi",
""
]
] | We investigate a compact star in the general $F(R)$ gravity. Developing a novel formulation in the spherically symmetric and static space-time with the matter, we confirm that an arbitrary relation between the mass $M$ and the radius $R_s$ of the compact star can be realized by adjusting the functional form of $F(R)$. ... |
gr-qc/9809040 | James M. Nester | C.C. Chang, J.M. Nester (Nat. Central U.), C.M. Chen (Moscow State U.) | Pseudotensors and quasilocal energy-momentum | LaTeX (REVTex), 4 pages, no figures, revised Title, abstract,
introduction and conclusion | Phys.Rev.Lett. 83 (1999) 1897-1901 | 10.1103/PhysRevLett.83.1897 | null | gr-qc | null | Early energy-momentum investigations for gravitating systems gave reference
frame dependent pseudotensors; later the quasilocal idea was developed.
Quasilocal energy-momentum can be determined by the Hamiltonian boundary term,
which also identifies the variables to be held fixed on the boundary. We show
that a pseudo... | [
{
"created": "Thu, 10 Sep 1998 12:45:00 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Apr 1999 14:15:01 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Chang",
"C. C.",
"",
"Nat. Central U."
],
[
"Nester",
"J. M.",
"",
"Nat. Central U."
],
[
"Chen",
"C. M.",
"",
"Moscow State U."
]
] | Early energy-momentum investigations for gravitating systems gave reference frame dependent pseudotensors; later the quasilocal idea was developed. Quasilocal energy-momentum can be determined by the Hamiltonian boundary term, which also identifies the variables to be held fixed on the boundary. We show that a pseudote... |
1607.05268 | Alexandr Panin | Dmitry Gorbunov, Alexander Panin | Strong-coupling scale and frame-dependence of the initial conditions for
chaotic inflation in models with modified (coupling to) gravity | null | null | null | INR-TH-2016-027 | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A classical evolution in chaotic inflationary models starts at high energy
densities with semi-classical initial conditions presumably consistent with
universal quantum nature of all the fundamental forces. That is each quantum
contributes the same amount to the energy density. We point out the upper limit
on this am... | [
{
"created": "Sun, 17 Jul 2016 21:18:14 GMT",
"version": "v1"
}
] | 2016-07-20 | [
[
"Gorbunov",
"Dmitry",
""
],
[
"Panin",
"Alexander",
""
]
] | A classical evolution in chaotic inflationary models starts at high energy densities with semi-classical initial conditions presumably consistent with universal quantum nature of all the fundamental forces. That is each quantum contributes the same amount to the energy density. We point out the upper limit on this amou... |
2004.09132 | Mahmut Hortacsu | M. Hortacsu | The radial Teukolsky equation for Kerr-Newman-de Sitter geometry:
Revisited | 7 pages. We add a paragraph, some references and corrected some
typoes | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use Heun type solutions given in \cite{Suzuki} for the radial Teukolsky
equation, written in the background metric of the Kerr-Newman-de Sitter
geometry, to calculate the quasinormal frequencies for polynomial solutions and
the reflection coefficient for waves coming from the de Sitter horizon and
reflected at the... | [
{
"created": "Mon, 20 Apr 2020 08:52:13 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Jun 2020 13:13:44 GMT",
"version": "v2"
},
{
"created": "Sun, 3 Jan 2021 10:01:56 GMT",
"version": "v3"
}
] | 2021-01-05 | [
[
"Hortacsu",
"M.",
""
]
] | We use Heun type solutions given in \cite{Suzuki} for the radial Teukolsky equation, written in the background metric of the Kerr-Newman-de Sitter geometry, to calculate the quasinormal frequencies for polynomial solutions and the reflection coefficient for waves coming from the de Sitter horizon and reflected at the o... |
1901.04849 | Nasr Ahmed | Nasr Ahmed | Ricci-Gauss-Bonnet holographic dark energy in Chern-Simons modified
gravity: A flat FLRW quintessence-dominated universe | 13 pages, 9 figures | null | 10.1142/S0217732320500078 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the recently suggested Ricci-Gauss-Bonnet holographic dark energy
in Chern-Simons modified gravity. We have tested some general forms of the
scale factor $a(t)$, and used two physically reasonable forms which have been
proved to be consistent with observations. Both solutions predict a sign
flipping in the... | [
{
"created": "Fri, 11 Jan 2019 20:33:56 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Aug 2019 18:06:11 GMT",
"version": "v2"
}
] | 2020-03-04 | [
[
"Ahmed",
"Nasr",
""
]
] | We discuss the recently suggested Ricci-Gauss-Bonnet holographic dark energy in Chern-Simons modified gravity. We have tested some general forms of the scale factor $a(t)$, and used two physically reasonable forms which have been proved to be consistent with observations. Both solutions predict a sign flipping in the e... |
gr-qc/0203027 | Guillermo A. Mena Marugan | Guillermo A. Mena Marugan | Extent of the Immirzi Ambiguity in Quantum General Relativity | 7 pages, accepted for publication in Classical and Quantum Gravity | Class.Quant.Grav.19:L63-2050,2002 | 10.1088/0264-9381/19/8/104 | null | gr-qc | null | The Ashtekar-Barbero formulation of general relativity admits a one-parameter
family of canonical transformations that preserves the expressions of the Gauss
and diffeomorphism constraints. The loop quantization of the connection
formalism based on each of these canonical sets leads to different predictions.
This phe... | [
{
"created": "Thu, 7 Mar 2002 16:57:19 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Marugan",
"Guillermo A. Mena",
""
]
] | The Ashtekar-Barbero formulation of general relativity admits a one-parameter family of canonical transformations that preserves the expressions of the Gauss and diffeomorphism constraints. The loop quantization of the connection formalism based on each of these canonical sets leads to different predictions. This pheno... |
1912.05300 | S. Kalyana Rama | S. Kalyana Rama | Black hole or Fuzz ball or a Loop quantum star ? Assessing the fate of a
massive collapsing star | Version 1. 17 pages. Version 2. 18 pages. A note and a few references
added | null | null | IMSc/2019/12/13 | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the effective equations in our Loop Quantum Cosmology (LQC) -- inspired
models, we resolve the $(n + 2)$ dimensional black hole singularity. This
resolution in the four dimensional case is same as that given recently by
Ashtekar, Olmedo, and Singh. We then study the fate of a massive collapsing
star in $(n + 2)... | [
{
"created": "Wed, 11 Dec 2019 13:44:48 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Dec 2019 05:09:47 GMT",
"version": "v2"
}
] | 2019-12-24 | [
[
"Rama",
"S. Kalyana",
""
]
] | Using the effective equations in our Loop Quantum Cosmology (LQC) -- inspired models, we resolve the $(n + 2)$ dimensional black hole singularity. This resolution in the four dimensional case is same as that given recently by Ashtekar, Olmedo, and Singh. We then study the fate of a massive collapsing star in $(n + 2)$ ... |
2201.10772 | Shyam Das | Shyam Das, Bikram Keshari Parida, Koushik Chakraborty, Saibal Ray | Anisotropic compact star with a linear pressure-density relationship | 18 pages, the manuscript is prepared in LaTex code. arXiv admin note:
text overlap with arXiv:2102.07099 | null | 10.1142/S0218271822500535 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We present a model of compact astrophysical object under General Theory of
Relativity using the anisotropic extension of Tolman IV solution. The
anisotropy function, derived from the model, remains well behaved throughout
the interior of the star. The model satisfies several necessary conditions for
a physically real... | [
{
"created": "Wed, 26 Jan 2022 06:41:05 GMT",
"version": "v1"
}
] | 2022-06-29 | [
[
"Das",
"Shyam",
""
],
[
"Parida",
"Bikram Keshari",
""
],
[
"Chakraborty",
"Koushik",
""
],
[
"Ray",
"Saibal",
""
]
] | We present a model of compact astrophysical object under General Theory of Relativity using the anisotropic extension of Tolman IV solution. The anisotropy function, derived from the model, remains well behaved throughout the interior of the star. The model satisfies several necessary conditions for a physically realis... |
gr-qc/0111084 | Guest User | G. S. Khadekar and Avinash R. Nagpure (Nagpur University, Nagpur) | Robertson-Walker Type Lyttleton-Bondi Universe in Five Dimensional
General Theory of Relativity | latex 4 pages, no figure | null | null | null | gr-qc | null | We study the Robertson-Walker type model in the Lyttleton-Bondi universe in
five dimensional general theory of relativity. Some exact and physical
properties of solutions are discussed.
| [
{
"created": "Sun, 25 Nov 2001 18:54:14 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Nov 2001 18:14:19 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Khadekar",
"G. S.",
"",
"Nagpur University, Nagpur"
],
[
"Nagpure",
"Avinash R.",
"",
"Nagpur University, Nagpur"
]
] | We study the Robertson-Walker type model in the Lyttleton-Bondi universe in five dimensional general theory of relativity. Some exact and physical properties of solutions are discussed. |
2003.09778 | Ka - Wai Chung | Adrian Ka-Wai Chung, Mairi Sakellariadou | Upper limits on the temperature of inspiraling astrophysical black holes | Match the published version | Eur. Phys. J. C 81, 592 (2021) | 10.1140/epjc/s10052-021-09391-3 | KCL-PH-TH/2020-07, LIGO-P2000068 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a method to constrain the temperature of astrophysical black holes
through detecting the inspiral phase of binary black hole coalescences. At
sufficient separation, inspiraling black holes can be regarded as isolated
objects, hence their temperature can still be defined. Due to their intrinsic
radiation, i... | [
{
"created": "Sun, 22 Mar 2020 01:19:59 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Jul 2021 11:08:56 GMT",
"version": "v2"
}
] | 2021-07-09 | [
[
"Chung",
"Adrian Ka-Wai",
""
],
[
"Sakellariadou",
"Mairi",
""
]
] | We present a method to constrain the temperature of astrophysical black holes through detecting the inspiral phase of binary black hole coalescences. At sufficient separation, inspiraling black holes can be regarded as isolated objects, hence their temperature can still be defined. Due to their intrinsic radiation, ins... |
1907.13219 | Francisco Lobo | Ruth Lazkoz, Francisco S. N. Lobo, Mar\'ia Ortiz-Ba\~nos, Vincenzo
Salzano | Observational constraints of $f(Q)$ gravity | 8 pages, minor additions to Conclusion; typo in author's name
corrected; version published in PRD | Phys. Rev. D 100, 104027 (2019) | 10.1103/PhysRevD.100.104027 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we consider an extension of symmetric teleparallel gravity,
namely, $f(Q)$ gravity, where the fundamental block to describe spacetime is
the nonmetricity, $Q$. Within this formulation of gravitation, we perform an
observational analysis of several modified $f(Q)$ models using the redshift
approach, wher... | [
{
"created": "Tue, 30 Jul 2019 20:53:33 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Nov 2019 22:14:08 GMT",
"version": "v2"
}
] | 2019-11-15 | [
[
"Lazkoz",
"Ruth",
""
],
[
"Lobo",
"Francisco S. N.",
""
],
[
"Ortiz-Baños",
"María",
""
],
[
"Salzano",
"Vincenzo",
""
]
] | In this work, we consider an extension of symmetric teleparallel gravity, namely, $f(Q)$ gravity, where the fundamental block to describe spacetime is the nonmetricity, $Q$. Within this formulation of gravitation, we perform an observational analysis of several modified $f(Q)$ models using the redshift approach, where ... |
2311.14190 | Neev Khera | Abhay Ashtekar, Neev Khera | Unified Treatment of null and Spatial Infinity IV: Angular Momentum at
Null and Spatial Infinity | Version to appear in JHEP. Slightly edited to improve the
presentation. Four references added. 30 pages, 1 figure | JHEP01 (2024) 085 | 10.1007/JHEP01(2024)085 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a companion paper we introduced the notion of asymptotically Minkowski
spacetimes. These space-times are asymptotically flat at both null and spatial
infinity, and furthermore there is a harmonious matching of limits of certain
fields as one approaches $i^\circ$ in null and space-like directions. These
matching co... | [
{
"created": "Thu, 23 Nov 2023 20:22:32 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Dec 2023 17:17:17 GMT",
"version": "v2"
}
] | 2024-01-18 | [
[
"Ashtekar",
"Abhay",
""
],
[
"Khera",
"Neev",
""
]
] | In a companion paper we introduced the notion of asymptotically Minkowski spacetimes. These space-times are asymptotically flat at both null and spatial infinity, and furthermore there is a harmonious matching of limits of certain fields as one approaches $i^\circ$ in null and space-like directions. These matching cond... |
1409.3284 | Stefan Danilishin L. | Stefan L. Danilishin, Sergey P. Vyatchanin, David G. Blair, Ju Li,
Chunnong Zhao | Time evolution of parametric instability in large-scale
gravitational-wave interferometers | 11 pages, 7 figures.Version 3 features added fig. 4 and refined
discussion on non-linear input-output relations for 3-mode parametric system
above the threshold, given in Sec. V | Phys. Rev. D 90, 122008 (2014) | 10.1103/PhysRevD.90.122008 | null | gr-qc astro-ph.IM physics.ins-det physics.optics | http://creativecommons.org/licenses/publicdomain/ | We present a study of three-mode parametric instability in large-scale
gravitational-wave detectors. Previous work used a linearised model to study
the onset of instability. This paper presents a non-linear study of this
phenomenon, which shows that the initial stage of exponential rise of the
amplitudes of a higher ... | [
{
"created": "Thu, 11 Sep 2014 00:32:29 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Nov 2014 11:28:03 GMT",
"version": "v2"
},
{
"created": "Sat, 6 Dec 2014 10:33:26 GMT",
"version": "v3"
}
] | 2015-01-06 | [
[
"Danilishin",
"Stefan L.",
""
],
[
"Vyatchanin",
"Sergey P.",
""
],
[
"Blair",
"David G.",
""
],
[
"Li",
"Ju",
""
],
[
"Zhao",
"Chunnong",
""
]
] | We present a study of three-mode parametric instability in large-scale gravitational-wave detectors. Previous work used a linearised model to study the onset of instability. This paper presents a non-linear study of this phenomenon, which shows that the initial stage of exponential rise of the amplitudes of a higher or... |
2311.15745 | Bikram Keshari Pradhan | Bikram Keshari Pradhan, Swarnim Shirke, and Debarati Chatterjee | Prospects of identifying the presence of Strange Stars using
Gravitational Waves from binary systems | 8 pages, 6 figures | null | null | null | gr-qc astro-ph.HE hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The existence of self-bound strange stars is a long-standing mystery in
astrophysics. Future astrophysical data, even with improved precision, may not
allow us to discriminate them from neutron stars, given the uncertainties in
observational and theoretical modeling. In this work, we propose a unique
strategy to dist... | [
{
"created": "Mon, 27 Nov 2023 12:03:13 GMT",
"version": "v1"
}
] | 2023-11-28 | [
[
"Pradhan",
"Bikram Keshari",
""
],
[
"Shirke",
"Swarnim",
""
],
[
"Chatterjee",
"Debarati",
""
]
] | The existence of self-bound strange stars is a long-standing mystery in astrophysics. Future astrophysical data, even with improved precision, may not allow us to discriminate them from neutron stars, given the uncertainties in observational and theoretical modeling. In this work, we propose a unique strategy to distin... |
0905.3165 | Alberto Lobo | J. Sanjuan, A. Lobo and J. Ramos-Castro | ADC non-linear errors correction in thermal diagnostics for the LISA
mission | 17 pages, 16 figures, RevTeX, submitted to Review of Scientific
Instruments | Rev.Sci.Instrum.80:114901,2009 | 10.1063/1.3258145 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Low-noise temperature measurements at frequencies in the milli-Hertz range
are needed in the LISA and LISA PathFinder (LPF). The required temperature
stability for LISA is around 10 uK/sqrt(Hz) at frequencies down to 0.1 mHz. In
this paper we focus on the identification and reduction of a source of excess
noise detec... | [
{
"created": "Tue, 19 May 2009 19:20:44 GMT",
"version": "v1"
}
] | 2010-02-25 | [
[
"Sanjuan",
"J.",
""
],
[
"Lobo",
"A.",
""
],
[
"Ramos-Castro",
"J.",
""
]
] | Low-noise temperature measurements at frequencies in the milli-Hertz range are needed in the LISA and LISA PathFinder (LPF). The required temperature stability for LISA is around 10 uK/sqrt(Hz) at frequencies down to 0.1 mHz. In this paper we focus on the identification and reduction of a source of excess noise detecte... |
2110.07153 | Ehsan Hatefi | Ehsan Hatefi, Armin Hatefi | Estimation of Critical Collapse Solutions to Black Holes with Nonlinear
Statistical Models | V2:38 pages, 12 Figures. Various clarifications are added. Published
version in Journal of Mathematics | Mathematics 2022, 10(23), 4537 | 10.3390/math10234537 | null | gr-qc hep-th physics.comp-ph physics.data-an | http://creativecommons.org/licenses/by/4.0/ | The self-similar gravitational collapse solutions to the
Einstein-axion-dilaton system have already been found out. Those solutions
become invariants after combining the spacetime dilation with the
transformations of internal SL(2, R). We apply nonlinear statistical models to
estimate the functions that appear in the... | [
{
"created": "Thu, 14 Oct 2021 05:00:53 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Nov 2022 17:49:12 GMT",
"version": "v2"
}
] | 2022-12-01 | [
[
"Hatefi",
"Ehsan",
""
],
[
"Hatefi",
"Armin",
""
]
] | The self-similar gravitational collapse solutions to the Einstein-axion-dilaton system have already been found out. Those solutions become invariants after combining the spacetime dilation with the transformations of internal SL(2, R). We apply nonlinear statistical models to estimate the functions that appear in the p... |
2005.04550 | Miguel Cruz | Miguel Cruz, Fernando Izaurieta and Samuel Lepe | Non-zero torsion and late cosmology | 20 pages, 1 figure. Accepted version in EPJC | Eur. Phys. J. C 80, 559 (2020) | 10.1140/epjc/s10052-020-8128-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we study some thermodynamical aspects associated with torsion
in a flat FLRW spacetime cosmic evolution. By implementing two Ansatze for the
torsion term, we find that the model admits a phantom regime or a quintessence
behavior. This scheme differs from the $\Lambda$CDM model at the
thermodynamical lev... | [
{
"created": "Sun, 10 May 2020 02:15:23 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Jun 2020 22:35:02 GMT",
"version": "v2"
}
] | 2020-06-26 | [
[
"Cruz",
"Miguel",
""
],
[
"Izaurieta",
"Fernando",
""
],
[
"Lepe",
"Samuel",
""
]
] | In this work, we study some thermodynamical aspects associated with torsion in a flat FLRW spacetime cosmic evolution. By implementing two Ansatze for the torsion term, we find that the model admits a phantom regime or a quintessence behavior. This scheme differs from the $\Lambda$CDM model at the thermodynamical level... |
gr-qc/0302066 | Victor Berezin | Victor Berezin (Inst. Nucl. Res. Russ. Acad. Sci., Moscow) | Black Hole Thermodynamics without a Black Hole? | 20 pages, it will be submitted to Phys.Lett.B | Nucl.Phys.B661:409-422,2003 | 10.1016/S0550-3213(03)00251-7 | Albert Einstein Institute preprint AEI-2003-016 | gr-qc | null | In the present paper we consider, using our earlier results, the process of
quantum gravitational collapse and argue that there exists the final quantum
state when the collapse stops. This state, which can be called the ``no-memory
state'', reminds the final ``no-hair state'' of the classical gravitational
collapse. ... | [
{
"created": "Mon, 17 Feb 2003 10:05:00 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Berezin",
"Victor",
"",
"Inst. Nucl. Res. Russ. Acad. Sci., Moscow"
]
] | In the present paper we consider, using our earlier results, the process of quantum gravitational collapse and argue that there exists the final quantum state when the collapse stops. This state, which can be called the ``no-memory state'', reminds the final ``no-hair state'' of the classical gravitational collapse. Tr... |
1001.3887 | Louis Crane | Louis Crane | Starships and Spinoza | First prize winner FQXi contest "On the limits of Physics" | null | null | null | gr-qc physics.pop-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a proposal to make small artificial black holes (ABH's) using a
huge laser. Because of Hawking radiation, they would be extremely powerful
energy sources. We investigate the technical problems of using them to make
power plants and starships. The first suggestion is due to Hawking. Next, we
consider what c... | [
{
"created": "Thu, 21 Jan 2010 21:37:14 GMT",
"version": "v1"
}
] | 2010-01-25 | [
[
"Crane",
"Louis",
""
]
] | We discuss a proposal to make small artificial black holes (ABH's) using a huge laser. Because of Hawking radiation, they would be extremely powerful energy sources. We investigate the technical problems of using them to make power plants and starships. The first suggestion is due to Hawking. Next, we consider what cha... |
1405.6351 | Antony Speranza | Ted Jacobson, Antony J. Speranza | Comment on "Scalar Einstein-Aether theory" | 2 pages, reference added | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recent paper studies a modification of Einstein-aether theory in which the
aether vector is restricted, at the level of the action, to be the gradient of
a scalar. In this comment we note that this scalar version of Einstein-aether
theory is equivalent to the projectable version of the IR limit of Ho\v{r}ava
gravit... | [
{
"created": "Sun, 25 May 2014 00:20:23 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Jun 2014 19:30:49 GMT",
"version": "v2"
}
] | 2014-06-13 | [
[
"Jacobson",
"Ted",
""
],
[
"Speranza",
"Antony J.",
""
]
] | A recent paper studies a modification of Einstein-aether theory in which the aether vector is restricted, at the level of the action, to be the gradient of a scalar. In this comment we note that this scalar version of Einstein-aether theory is equivalent to the projectable version of the IR limit of Ho\v{r}ava gravity ... |
2102.07692 | Elia Pizzati | Elia Pizzati, Surabhi Sachdev, Anuradha Gupta, Bangalore Sathyaprakash | Towards inference of overlapping gravitational wave signals | 13 pages, 5 figures, 1 table; accepted for publication in PRD | null | 10.1103/PhysRevD.105.104016 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Merger rates of binary black holes, binary neutron stars, and neutron
star-black hole binaries in the local Universe (i.e., redshift $z=0$), inferred
from the Laser Interferometer Gravitational Wave Observatory (LIGO) and Virgo,
are $16-130\, \mathrm{Gpc}^{-3}\,\mathrm{yr}^{-1}$, $13-1900\,
\mathrm{Gpc}^{-3}\,\mathrm... | [
{
"created": "Mon, 15 Feb 2021 17:41:11 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Apr 2022 20:33:58 GMT",
"version": "v2"
}
] | 2022-05-16 | [
[
"Pizzati",
"Elia",
""
],
[
"Sachdev",
"Surabhi",
""
],
[
"Gupta",
"Anuradha",
""
],
[
"Sathyaprakash",
"Bangalore",
""
]
] | Merger rates of binary black holes, binary neutron stars, and neutron star-black hole binaries in the local Universe (i.e., redshift $z=0$), inferred from the Laser Interferometer Gravitational Wave Observatory (LIGO) and Virgo, are $16-130\, \mathrm{Gpc}^{-3}\,\mathrm{yr}^{-1}$, $13-1900\, \mathrm{Gpc}^{-3}\,\mathrm{y... |
gr-qc/9905045 | Diego F. Torres | Diego F. Torres | Stellar footprints of a variable G | This essay received Honorable Mention in the 1999 Essay Competition
of the Gravity Research Foundation | Mod.Phys.Lett. A14 (1999) 1007-1014 | 10.1142/S0217732399001061 | null | gr-qc | null | Theories with varying gravitational constant $G$ have been studied since long
time ago. Among them, the most promising candidates as alternatives of the
standard General Relativity are known as scalar-tensor theories. They provide
consistent descriptions of the observed universe and arise as the low energy
limit of s... | [
{
"created": "Fri, 14 May 1999 13:49:50 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Torres",
"Diego F.",
""
]
] | Theories with varying gravitational constant $G$ have been studied since long time ago. Among them, the most promising candidates as alternatives of the standard General Relativity are known as scalar-tensor theories. They provide consistent descriptions of the observed universe and arise as the low energy limit of sev... |
1911.09978 | Alejandro Garc\'ia-Quismondo | Alejandro Garcia-Quismondo and Guillermo A. Mena Marugan | Dapor-Liegener formalism of loop quantum cosmology for Bianchi I
spacetimes | 22 pages | Phys. Rev. D 101, 023520 (2020) | 10.1103/PhysRevD.101.023520 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the quantization of vacuum Bianchi I spacetimes in the modified
formalism of loop quantum cosmology recently proposed by Dapor and Liegener.
This modification is based on a regularization procedure where both the
Euclidean and Lorentzian terms of the Hamiltonian are treated independently.
Whereas the Eucli... | [
{
"created": "Fri, 22 Nov 2019 11:31:52 GMT",
"version": "v1"
}
] | 2020-01-29 | [
[
"Garcia-Quismondo",
"Alejandro",
""
],
[
"Marugan",
"Guillermo A. Mena",
""
]
] | We discuss the quantization of vacuum Bianchi I spacetimes in the modified formalism of loop quantum cosmology recently proposed by Dapor and Liegener. This modification is based on a regularization procedure where both the Euclidean and Lorentzian terms of the Hamiltonian are treated independently. Whereas the Euclide... |
gr-qc/9905059 | Jose M. M. Senovilla | J. Carot, J. M. M. Senovilla and R. Vera | On the definition of cylindrical symmetry | 12 pages, LaTeX, no figures | Class.Quant.Grav. 16 (1999) 3025-3034 | 10.1088/0264-9381/16/9/318 | null | gr-qc | null | The standard definition of cylindrical symmetry in General Relativity is
reviewed. Taking the view that axial symmetry is an essential pre-requisite for
cylindrical symmetry, it is argued that the requirement of orthogonal
transitivity of the isometry group should be dropped, this leading to a new,
more general defin... | [
{
"created": "Tue, 18 May 1999 09:38:07 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Carot",
"J.",
""
],
[
"Senovilla",
"J. M. M.",
""
],
[
"Vera",
"R.",
""
]
] | The standard definition of cylindrical symmetry in General Relativity is reviewed. Taking the view that axial symmetry is an essential pre-requisite for cylindrical symmetry, it is argued that the requirement of orthogonal transitivity of the isometry group should be dropped, this leading to a new, more general definit... |
1611.09654 | Aldo Mart\'inez Merino | Aldo Mart\'inez-Merino, Octavio Obreg\'on, and Michael P. Ryan Jr | Newtonian black holes: Particle production, "Hawking" temperature,
entropies and entropy field equations | 21 pages, 6 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Newtonian gravitation with some slight modifications, along with some highly
simplified ideas from quantum field theory allow us to reproduce, at least at
the level of back-of-the-envelope calculations, many results of black hole
physics. We consider particle production by a black hole, the Newtonian
equivalent of th... | [
{
"created": "Sun, 27 Nov 2016 07:31:49 GMT",
"version": "v1"
}
] | 2016-11-30 | [
[
"Martínez-Merino",
"Aldo",
""
],
[
"Obregón",
"Octavio",
""
],
[
"Ryan",
"Michael P.",
"Jr"
]
] | Newtonian gravitation with some slight modifications, along with some highly simplified ideas from quantum field theory allow us to reproduce, at least at the level of back-of-the-envelope calculations, many results of black hole physics. We consider particle production by a black hole, the Newtonian equivalent of the ... |
gr-qc/0105091 | Bo-Bo Wang | Bo-Bo Wang and Liao Liu | The statistic thermodynamical entropy of de Sitter space and it's 1-loop
correction | 10 pages, 0 figures | null | null | null | gr-qc | null | From the partition function of canonical ensemble we derive the entropy of
the de Sitter space by anti-Wick rotation. And then from the one-loop bubble
$S^2\times S^2$ created from vacuum fluctuation in de Sitter background space,
we obtain the one-loop quantum correction to the entropy of de Sitter space.
| [
{
"created": "Fri, 25 May 2001 07:24:20 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wang",
"Bo-Bo",
""
],
[
"Liu",
"Liao",
""
]
] | From the partition function of canonical ensemble we derive the entropy of the de Sitter space by anti-Wick rotation. And then from the one-loop bubble $S^2\times S^2$ created from vacuum fluctuation in de Sitter background space, we obtain the one-loop quantum correction to the entropy of de Sitter space. |
gr-qc/0306117 | Mikhail V. Gorbatenko | M.V. Gorbatenko | Discontinuity surface instead of singularity | 6 pages | null | null | null | gr-qc | null | Einstein equations are addressed with the energy-momentum tensor that appears
if the equations under discussion are required to possess conformal invariance.
It is proved that thus derived equations (equations of conformally invariant
geometrodynamics) can have not only smooth solutions, but also solutions with
disco... | [
{
"created": "Thu, 26 Jun 2003 10:16:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gorbatenko",
"M. V.",
""
]
] | Einstein equations are addressed with the energy-momentum tensor that appears if the equations under discussion are required to possess conformal invariance. It is proved that thus derived equations (equations of conformally invariant geometrodynamics) can have not only smooth solutions, but also solutions with discont... |
1807.04762 | Caio Macedo | Caio F. B. Macedo, Tom Stratton, Sam Dolan, Lu\'is C. B. Crispino | Spectral lines of extreme compact objects | 6 pages, 4 figures. Matches PRD version | Phys. Rev. D 98, 104034 (2018) | 10.1103/PhysRevD.98.104034 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the absorption of scalar fields by extreme/exotic compact objects
(ECOs) -- horizonless alternatives to black holes -- via a simple model in
which dissipative mechanisms are encapsulated in a single parameter. Trapped
modes, localized between the ECO core and the potential barrier at the
photosphere, generat... | [
{
"created": "Thu, 12 Jul 2018 18:00:07 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Nov 2018 15:48:30 GMT",
"version": "v2"
}
] | 2018-11-28 | [
[
"Macedo",
"Caio F. B.",
""
],
[
"Stratton",
"Tom",
""
],
[
"Dolan",
"Sam",
""
],
[
"Crispino",
"Luís C. B.",
""
]
] | We study the absorption of scalar fields by extreme/exotic compact objects (ECOs) -- horizonless alternatives to black holes -- via a simple model in which dissipative mechanisms are encapsulated in a single parameter. Trapped modes, localized between the ECO core and the potential barrier at the photosphere, generate ... |
gr-qc/0001065 | Folomeev V. N. | V.N. Folomeev and V.Ts. Gurovich | Quantum Evolution of the Bianchi Type I Model | Latex, 18 pages, 5 figures | Grav.Cosmol. 6 (2000) 19-26 | 10.1023/A:1001938620139 | null | gr-qc | null | The behaviour of the flat anisotropic model of the Universe with a scalar
field is explored within the framework of quantum cosmology. The principal
moment of the account of an anisotropy is the presence either negative
potential barrier or positive repelling wall. In the first case occur the above
barrier reflection... | [
{
"created": "Fri, 21 Jan 2000 15:00:49 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Jan 2000 06:01:05 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Folomeev",
"V. N.",
""
],
[
"Gurovich",
"V. Ts.",
""
]
] | The behaviour of the flat anisotropic model of the Universe with a scalar field is explored within the framework of quantum cosmology. The principal moment of the account of an anisotropy is the presence either negative potential barrier or positive repelling wall. In the first case occur the above barrier reflection o... |
gr-qc/0407006 | Noah Graham | Noah Graham, Ken D. Olum, and Delia Schwartz-Perlov | Energy conditions outside a dielectric ball | 12 pages, RevTex4 | Phys.Rev. D70 (2004) 105019 | 10.1103/PhysRevD.70.105019 | null | gr-qc hep-th | null | We show analytically that the vacuum electromagnetic stress-energy tensor
outside a ball with constant dielectric constant and permeability always obeys
the weak, null, dominant, and strong energy conditions. There are still no
known examples in quantum field theory in which the averaged null energy
condition in flat... | [
{
"created": "Thu, 1 Jul 2004 16:07:37 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Graham",
"Noah",
""
],
[
"Olum",
"Ken D.",
""
],
[
"Schwartz-Perlov",
"Delia",
""
]
] | We show analytically that the vacuum electromagnetic stress-energy tensor outside a ball with constant dielectric constant and permeability always obeys the weak, null, dominant, and strong energy conditions. There are still no known examples in quantum field theory in which the averaged null energy condition in flat s... |
gr-qc/9311009 | null | P. Menotti and D. Seminara | 2+1 Gravity and Closed Time-Like Curves | Talk given at the Workshop on ``Constraint Theory and Quantization
Methods'',10 pages, Latex, IFUP-TH-43/93 | null | null | null | gr-qc hep-th | null | In this paper we report some results obtained by applying the radial gauge to
2+1 dimensional gravity. The general features of this gauge are reviewed and it
is shown how they allow the general solution of the problem in terms of simple
quadratures. Then we concentrate on the general stationary problem providing
the ... | [
{
"created": "Fri, 5 Nov 1993 20:29:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Menotti",
"P.",
""
],
[
"Seminara",
"D.",
""
]
] | In this paper we report some results obtained by applying the radial gauge to 2+1 dimensional gravity. The general features of this gauge are reviewed and it is shown how they allow the general solution of the problem in terms of simple quadratures. Then we concentrate on the general stationary problem providing the ex... |
2008.07593 | Fil Simovic | Fil Simovic, Danny Fusco, Robert B. Mann | Thermodynamics of de Sitter Black Holes with Conformally Coupled Scalar
Fields | 15 pages, 4 figures | null | 10.1007/JHEP02(2021)219 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the thermodynamic properties of 3+1 dimensional black holes in
asymptotically de Sitter spacetimes, conformally coupled to a real scalar
field. We use a Euclidean action approach, where boundary value data is
specified at a finite radius `cavity' outside the black hole, working in the
extended phase sp... | [
{
"created": "Mon, 17 Aug 2020 19:46:13 GMT",
"version": "v1"
}
] | 2021-03-17 | [
[
"Simovic",
"Fil",
""
],
[
"Fusco",
"Danny",
""
],
[
"Mann",
"Robert B.",
""
]
] | We investigate the thermodynamic properties of 3+1 dimensional black holes in asymptotically de Sitter spacetimes, conformally coupled to a real scalar field. We use a Euclidean action approach, where boundary value data is specified at a finite radius `cavity' outside the black hole, working in the extended phase spac... |
0909.0070 | Robert van den Hoogen | R. J. van den Hoogen | A Complete Cosmological Solution to the Averaged Einstein Field
Equations as found in Macroscopic Gravity | 11 pages | J.Math.Phys.50:082503,2009 | 10.1063/1.3193686 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A formalism for analyzing the complete set of field equations describing
Macroscopic Gravity is presented. Using this formalism, a cosmological solution
to the Macroscopic Gravity equations is determined. It is found that if a
particular segment of the connection correlation tensor is zero and if the
macroscopic geom... | [
{
"created": "Tue, 1 Sep 2009 02:13:42 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Hoogen",
"R. J. van den",
""
]
] | A formalism for analyzing the complete set of field equations describing Macroscopic Gravity is presented. Using this formalism, a cosmological solution to the Macroscopic Gravity equations is determined. It is found that if a particular segment of the connection correlation tensor is zero and if the macroscopic geomet... |
1410.0460 | Albert V. Minkevich | A.S. Garkun, V.I. Kudin, A.V. Minkevich | To theory of asymptotically stable accelerating Universe in
Riemann-Cartan spacetime | 13 pages, 3 figures. arXiv admin note: substantial text overlap with
arXiv:1107.1566 | JCAP 12 (2014) 027 | 10.1088/1475-7516/2014/12/027 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Homogeneous isotropic cosmological models built in the framework of the
Poincar\'e gauge theory of gravity based on general expression of gravitational
Lagrangian with indefinite parameters are analyzed. Special points of
cosmological solutions for flat cosmological models at asymptotics and
conditions of their stabi... | [
{
"created": "Thu, 2 Oct 2014 07:15:28 GMT",
"version": "v1"
}
] | 2014-12-23 | [
[
"Garkun",
"A. S.",
""
],
[
"Kudin",
"V. I.",
""
],
[
"Minkevich",
"A. V.",
""
]
] | Homogeneous isotropic cosmological models built in the framework of the Poincar\'e gauge theory of gravity based on general expression of gravitational Lagrangian with indefinite parameters are analyzed. Special points of cosmological solutions for flat cosmological models at asymptotics and conditions of their stabili... |
1001.5263 | Lode Wylleman | Lode Wylleman and David Beke | Expanding perfect fluid generalizations of the C-metric | 16 pages, extended and amended version | Phys.Rev.D81:104038,2010 | 10.1103/PhysRevD.81.104038 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reexamine Petrov type D gravitational fields generated by a perfect fluid
with spatially homogeneous energy density and in which the flow lines form a
timelike non-shearing and non-rotating congruence. It is shown that the
anisotropic such spacetimes, which comprise the vacuum C-metric as a limit
case, can have \e... | [
{
"created": "Thu, 28 Jan 2010 20:54:53 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Mar 2010 17:35:46 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Wylleman",
"Lode",
""
],
[
"Beke",
"David",
""
]
] | We reexamine Petrov type D gravitational fields generated by a perfect fluid with spatially homogeneous energy density and in which the flow lines form a timelike non-shearing and non-rotating congruence. It is shown that the anisotropic such spacetimes, which comprise the vacuum C-metric as a limit case, can have \emp... |
gr-qc/0408100 | Cesar Eduardo Mora Ley | Luis O. Pimentel and Cesar Mora | Noncommutative Quantum Cosmology | Revtex4, 3 pages, 2 figures, to appear in Gen.Rel.Grav | Gen.Rel.Grav. 37 (2005) 817-821 | 10.1007/s10714-005-0066-3 | null | gr-qc | null | We consider noncommutative quantum cosmology in the case of the low-energy
string effective theory. Exacts solutions are found and compared with the
commutative case.The Noncommutative quantum cosmology is considered in the case
of the low-energy string effective theory. Exacts solutions are found and
compared with t... | [
{
"created": "Tue, 31 Aug 2004 09:43:54 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Pimentel",
"Luis O.",
""
],
[
"Mora",
"Cesar",
""
]
] | We consider noncommutative quantum cosmology in the case of the low-energy string effective theory. Exacts solutions are found and compared with the commutative case.The Noncommutative quantum cosmology is considered in the case of the low-energy string effective theory. Exacts solutions are found and compared with the... |
1307.1099 | Dennis Bessada | Dennis Bessada | DBI analog of a decaying vacuum cosmology | Some typos corrected. To appear in Physical Review D | null | 10.1103/PhysRevD.88.023005 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work I discuss the dynamical and thermodynamical equivalence between
a general k-essence scalar field cosmology and an arbitrary cosmological model
with a decaying vacuum, thus generalizing the approach proposed by Maia and
Lima [Phys. Rev. D {\bf 65}, 083513 (2002)]. The formalism obtained is quite
general a... | [
{
"created": "Wed, 3 Jul 2013 18:11:22 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Jul 2013 00:47:59 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Bessada",
"Dennis",
""
]
] | In this work I discuss the dynamical and thermodynamical equivalence between a general k-essence scalar field cosmology and an arbitrary cosmological model with a decaying vacuum, thus generalizing the approach proposed by Maia and Lima [Phys. Rev. D {\bf 65}, 083513 (2002)]. The formalism obtained is quite general and... |
2101.00208 | Mushtaq Ahmad Sial | G. Mustafa, Xia Tie-Cheng, Mushtaq Ahmad, M. Farasat Shamir | Anisotropic spheres via embedding approach in
$\mathcal{R}+\beta\mathcal{R}^{2}$ gravity with matter coupling | 20 pages, 17 figures | Phys. Dark Universe 31 (2021) 100747 | 10.1016/j.dark.2020.100747 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The manifesto of the current article is to investigate the compact
anisotropic matter profiles in the context of one of the modified gravitational
theories, known as $f(\mathcal{R}, \mathcal{T})$ gravity, where $\mathcal{R}$
is a Ricci Scalar and $\mathcal{T}$ is the trace of the energy-momentum tensor.
To achieve th... | [
{
"created": "Fri, 1 Jan 2021 10:55:30 GMT",
"version": "v1"
}
] | 2021-01-05 | [
[
"Mustafa",
"G.",
""
],
[
"Tie-Cheng",
"Xia",
""
],
[
"Ahmad",
"Mushtaq",
""
],
[
"Shamir",
"M. Farasat",
""
]
] | The manifesto of the current article is to investigate the compact anisotropic matter profiles in the context of one of the modified gravitational theories, known as $f(\mathcal{R}, \mathcal{T})$ gravity, where $\mathcal{R}$ is a Ricci Scalar and $\mathcal{T}$ is the trace of the energy-momentum tensor. To achieve the ... |
2311.07047 | Jieci Wang | Qianqian Liu, Shu-Min Wu, Cuihong Wen, Jieci Wang | Quantum properties of fermionic fields in multi-event horizon spacetime | 14 pages, 7 figures | null | null | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the properties of quantum entanglement and mutual information
in the multi-event horizon Schwarzschild-de Sitter (SdS) spacetime for massless
Dirac fields. We obtain the expression for the evolutions of the quantum state
near the black hole event horizon (BEH) and cosmological event horizon (CEH) in
th... | [
{
"created": "Mon, 13 Nov 2023 03:17:36 GMT",
"version": "v1"
}
] | 2023-11-14 | [
[
"Liu",
"Qianqian",
""
],
[
"Wu",
"Shu-Min",
""
],
[
"Wen",
"Cuihong",
""
],
[
"Wang",
"Jieci",
""
]
] | We investigate the properties of quantum entanglement and mutual information in the multi-event horizon Schwarzschild-de Sitter (SdS) spacetime for massless Dirac fields. We obtain the expression for the evolutions of the quantum state near the black hole event horizon (BEH) and cosmological event horizon (CEH) in the ... |
gr-qc/0007055 | Guido Pizzella | P. Astone, M. Bassan, P. Bonifazi, P. Carelli, E. Coccia, C.Cosmelli,
S.D'Antonio, V. Fafone, G.Federici, A. Marini, Y. Minenkov, I. Modena, G.
Modestino, A. Moleti, G. V. Pallottino, G. Pizzella, L.Quintieri, F. Ronga,
R. Terenzi M. Visco, L. Votano | Study of Coincidences between Resonant Gravitational Wave Detectors | revised version (minor changes and a comment in the conclusion) | Class.Quant.Grav.18:243-252,2001 | 10.1088/0264-9381/18/2/304 | null | gr-qc | null | Coincidences are searched with the cryogenic resonant gravitational wave
detectors EXPLORER and NAUTILUS, during a period of about six months (2 June-14
December 1998) for a total measuring time of 94.5 days, with the purpose to
study new algorithms of analysis, based on the physical characteristics of the
detectors.... | [
{
"created": "Fri, 21 Jul 2000 07:16:14 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Oct 2000 08:30:36 GMT",
"version": "v2"
}
] | 2011-08-17 | [
[
"Astone",
"P.",
""
],
[
"Bassan",
"M.",
""
],
[
"Bonifazi",
"P.",
""
],
[
"Carelli",
"P.",
""
],
[
"Coccia",
"E.",
""
],
[
"Cosmelli",
"C.",
""
],
[
"D'Antonio",
"S.",
""
],
[
"Fafone",
"V.",
... | Coincidences are searched with the cryogenic resonant gravitational wave detectors EXPLORER and NAUTILUS, during a period of about six months (2 June-14 December 1998) for a total measuring time of 94.5 days, with the purpose to study new algorithms of analysis, based on the physical characteristics of the detectors. |
1006.5543 | Emilio Santos Corchero | Emilio Santos | Dark energy as a curvature of space-time induced by quantum vacuum
fluctuations | Accepted in Astrophysics and Space Science | Astrophys.Space Sci.332:423-435,2011 | 10.1007/s10509-010-0557-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that quantum vacuum fluctuations give rise to a curvature of
space-time of the order appropriate to explain the observed accelerated
expansion of the universe. The fact that the fluctuations produce curvature,
even if the expectation of the vacuum energy vanishes, is a consequence of the
non-linear charac... | [
{
"created": "Tue, 29 Jun 2010 08:51:05 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Nov 2010 11:27:14 GMT",
"version": "v2"
}
] | 2011-03-21 | [
[
"Santos",
"Emilio",
""
]
] | It is shown that quantum vacuum fluctuations give rise to a curvature of space-time of the order appropriate to explain the observed accelerated expansion of the universe. The fact that the fluctuations produce curvature, even if the expectation of the vacuum energy vanishes, is a consequence of the non-linear characte... |
1401.3391 | Yurii V. Dumin | Yurii V. Dumin (Lomonosov Moscow State University, Russia & Space
Research Institute of Russian Academy of Sciences, Moscow, Russia) | Nonlocal Quantum Effects in Cosmology | REVTeX4, 18 pages, 7 EPS figures, submitted to "Advances in High
Energy Physics" (AHEP), Special Issue "Experimental Tests of Quantum Gravity
and Exotic Quantum Field Theory Effects"; v2: minor editorial changes, one
figure added | Advances in High Energy Physics, vol. 2014, Article ID 241831
(2014) | 10.1155/2014/241831 | null | gr-qc hep-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Since it is commonly believed that the observed large-scale structure of the
Universe is an imprint of quantum fluctuations existing at the very early stage
of its evolution, it is reasonable to pose the question: Do the effects of
quantum nonlocality, which are well established now by the laboratory studies,
manifes... | [
{
"created": "Tue, 14 Jan 2014 23:55:48 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Apr 2014 04:03:55 GMT",
"version": "v2"
}
] | 2014-05-26 | [
[
"Dumin",
"Yurii V.",
"",
"Lomonosov Moscow State University, Russia & Space\n Research Institute of Russian Academy of Sciences, Moscow, Russia"
]
] | Since it is commonly believed that the observed large-scale structure of the Universe is an imprint of quantum fluctuations existing at the very early stage of its evolution, it is reasonable to pose the question: Do the effects of quantum nonlocality, which are well established now by the laboratory studies, manifest ... |
1909.05322 | Ding Jia | Ding Jia | World quantum gravity: Quantum test objects and Synge's world function | mathces well published version | Class. Quantum Grav. 38, 215001 (2021) | 10.1088/1361-6382/ac25de | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new path integral approach of quantum gravity based on relational variables
and quantum test objects is presented. We take as a basic variables the squared
invariant distance. This invariant quantity is technically simpler to work with
than variant quantities such as the metric tensor. It also facilitates the
studi... | [
{
"created": "Wed, 11 Sep 2019 19:34:16 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Feb 2020 17:24:03 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Feb 2021 14:49:00 GMT",
"version": "v3"
},
{
"created": "Tue, 1 Mar 2022 21:16:32 GMT",
"version": "v4"
}
] | 2022-03-03 | [
[
"Jia",
"Ding",
""
]
] | A new path integral approach of quantum gravity based on relational variables and quantum test objects is presented. We take as a basic variables the squared invariant distance. This invariant quantity is technically simpler to work with than variant quantities such as the metric tensor. It also facilitates the studies... |
2109.04035 | Jia-Hui Huang | Jia-Hui Huang, Run-Dong Zhao, Yi-Feng Zou | Higher-dimensional non-extremal Reissner-Nordstrom black holes, scalar
perturbation and superradiance: an analytical study | 11pages,no figure | null | 10.1016/j.physletb.2021.136724 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | The superradiant stability of higher dimensional non-extremal
Reissner-Nordstrom black holes under charged massive scalar perturbation is
analytically studied. We extend an analytical method developed by one of the
authors in the extremal Reissner-Nordstrom black hole cases to non-extremal
cases. Using the new analyt... | [
{
"created": "Thu, 9 Sep 2021 04:57:52 GMT",
"version": "v1"
}
] | 2021-10-20 | [
[
"Huang",
"Jia-Hui",
""
],
[
"Zhao",
"Run-Dong",
""
],
[
"Zou",
"Yi-Feng",
""
]
] | The superradiant stability of higher dimensional non-extremal Reissner-Nordstrom black holes under charged massive scalar perturbation is analytically studied. We extend an analytical method developed by one of the authors in the extremal Reissner-Nordstrom black hole cases to non-extremal cases. Using the new analytic... |
0707.3806 | Martin Tajmar | M. Tajmar, F. Plesescu, B. Seifert, R. Schnitzer, I. Vasiljevich | Search for Frame-Dragging-Like Signals Close to Spinning Superconductors | Paper presented at the 18th International Conference on General
Relativity & Gravitation, Sydney, Jul 2007 and at the Time & Matter
Conference, Bled, Sept 2007, GPB Data Corrected and Model Updated | Proceedings of the 2nd International Conference on Time and
Matter, University of Nova Gorica Press, Nova Gorica, 2008, pp. 49-74 | null | null | gr-qc | null | High-resolution accelerometer and laser gyroscope measurements were performed
in the vicinity of spinning rings at cryogenic temperatures. After passing a
critical temperature, which does not coincide with the material's
superconducting temperature, the angular acceleration and angular velocity
applied to the rotatin... | [
{
"created": "Wed, 25 Jul 2007 19:25:10 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Jul 2007 16:35:53 GMT",
"version": "v2"
},
{
"created": "Fri, 10 Aug 2007 15:54:43 GMT",
"version": "v3"
},
{
"created": "Sat, 25 Aug 2007 10:51:12 GMT",
"version": "v4"
},
{
"c... | 2008-04-22 | [
[
"Tajmar",
"M.",
""
],
[
"Plesescu",
"F.",
""
],
[
"Seifert",
"B.",
""
],
[
"Schnitzer",
"R.",
""
],
[
"Vasiljevich",
"I.",
""
]
] | High-resolution accelerometer and laser gyroscope measurements were performed in the vicinity of spinning rings at cryogenic temperatures. After passing a critical temperature, which does not coincide with the material's superconducting temperature, the angular acceleration and angular velocity applied to the rotating ... |
2407.21482 | Peter Steffen | W. Bartel (1), C. W. Elvers (1), L. J\"onsson (2), G. Kempf (1), H.
Krause (3), B. Loehr (1), E. Lohrmann (3), H. Meyer (4), P. Steffen (1), E.
Wuensch (1) ((1) Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany, (2)
Lund University, Sweden, (3) Universit\"at Hamburg,(4) Bergische
Universit\"at, Wuppertal) | Measurements of Gravitational Attractions at small Accelerations | 19 pages, 8 figures | null | null | DESY 24-116 | gr-qc physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational interactions were studied by measuring the influence of small
external field masses on a microwave resonator. It consisted of two spherical
mirrors, which acted as independent pendulumsindividually suspended by strings.
Two identical field masses weremoved along the axis of the resonator
symmetrically a... | [
{
"created": "Wed, 31 Jul 2024 09:48:13 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Aug 2024 07:29:31 GMT",
"version": "v2"
}
] | 2024-08-12 | [
[
"Bartel",
"W.",
""
],
[
"Elvers",
"C. W.",
""
],
[
"Jönsson",
"L.",
""
],
[
"Kempf",
"G.",
""
],
[
"Krause",
"H.",
""
],
[
"Loehr",
"B.",
""
],
[
"Lohrmann",
"E.",
""
],
[
"Meyer",
"H.",
""
... | Gravitational interactions were studied by measuring the influence of small external field masses on a microwave resonator. It consisted of two spherical mirrors, which acted as independent pendulumsindividually suspended by strings. Two identical field masses weremoved along the axis of the resonator symmetrically and... |
1612.07507 | Philippe Grandclement | Philippe Grandcl\'ement (LUTH) | Light rings and light points of boson stars | null | Phys. Rev. D 95, 084011 (2017) | 10.1103/PhysRevD.95.084011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work is devoted to the study of photon trajectories around rotating
boson stars. The basic properties of boson star models are given with a
particular emphasis on the high compactness those objects can have. Using an
effective potential method, circular orbits of photons around rotating boson
stars are then obta... | [
{
"created": "Thu, 22 Dec 2016 09:49:51 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Apr 2017 14:39:51 GMT",
"version": "v2"
}
] | 2017-04-12 | [
[
"Grandclément",
"Philippe",
"",
"LUTH"
]
] | This work is devoted to the study of photon trajectories around rotating boson stars. The basic properties of boson star models are given with a particular emphasis on the high compactness those objects can have. Using an effective potential method, circular orbits of photons around rotating boson stars are then obtain... |
1404.1000 | Diego S\'aez | Neus Puchades and Diego S\'aez | Relativistic Positioning Systems: Numerical Simulations | 10 pages, 4 figures, published in ACTA FUTURA/ACT/ESA | ACTA FUTURA (2013) | 10.2420/AF07.2013.103 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The motion of satellite constellations similar to GPS and Galileo is
numerically simulated and, then, the region where bifurcation (double
positioning) occurs is appropriately represented. In the cases of double
positioning, the true location may be found using additional information
(angles or times). The zone where... | [
{
"created": "Thu, 3 Apr 2014 16:32:29 GMT",
"version": "v1"
}
] | 2014-04-04 | [
[
"Puchades",
"Neus",
""
],
[
"Sáez",
"Diego",
""
]
] | The motion of satellite constellations similar to GPS and Galileo is numerically simulated and, then, the region where bifurcation (double positioning) occurs is appropriately represented. In the cases of double positioning, the true location may be found using additional information (angles or times). The zone where t... |
1801.05472 | Felipe Asenjo | Sergio A. Hojman and Felipe A. Asenjo | Electromagnetic redshift in anisotropic cosmologies | null | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The redshift of light is calculated for an anisotropic cosmological
spacetime. Two different approaches are considered. In the first one,
electromagnetic waves are modeled using the geometrical optics
(high--frequency) approximation. This approach considers light rays following
null geodesics, being equivalent to the... | [
{
"created": "Tue, 16 Jan 2018 20:22:35 GMT",
"version": "v1"
},
{
"created": "Tue, 8 May 2018 19:58:57 GMT",
"version": "v2"
}
] | 2018-05-10 | [
[
"Hojman",
"Sergio A.",
""
],
[
"Asenjo",
"Felipe A.",
""
]
] | The redshift of light is calculated for an anisotropic cosmological spacetime. Two different approaches are considered. In the first one, electromagnetic waves are modeled using the geometrical optics (high--frequency) approximation. This approach considers light rays following null geodesics, being equivalent to the m... |
2001.06695 | Yen-Wei Liu | Yi-Zen Chu and Yen-Wei Liu | Gravitational Tensor and Acoustic Waves in A Radiation Dominated
Universe: Weyl Curvature and Polarization Patterns | 30 pages, version accepted by PRD | Phys. Rev. D 103, 124033 (2021) | 10.1103/PhysRevD.103.124033 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide evidence that gravitational radiation in a 4D radiation-dominated
universe, with equation-of-state $w=1/3$, consists of two components:
helicity-2 gravitons and massless scalar acoustic waves. On physical grounds,
we would expect the homogeneous solution of the Weyl tensor components to be a
good approxima... | [
{
"created": "Sat, 18 Jan 2020 16:00:30 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Jun 2021 18:19:56 GMT",
"version": "v2"
}
] | 2021-06-22 | [
[
"Chu",
"Yi-Zen",
""
],
[
"Liu",
"Yen-Wei",
""
]
] | We provide evidence that gravitational radiation in a 4D radiation-dominated universe, with equation-of-state $w=1/3$, consists of two components: helicity-2 gravitons and massless scalar acoustic waves. On physical grounds, we would expect the homogeneous solution of the Weyl tensor components to be a good approximati... |
0705.1049 | Joan Josep Ferrando | Joan Josep Ferrando, Ramon Lapiedra and Juan Antonio Morales | Creatable Universes | 19 pages; v2: we have added an Appendix to make explicit the proof of
the quasi-uniqueness of the defined energy and momenta of the Universe, for
every space-like 3-surface | Phys.Rev.D75:124003,2007 | 10.1103/PhysRevD.75.124003 | null | gr-qc astro-ph | null | We consider the question of properly defining energy and momenta for non
asymptotic Minkowskian spaces in general relativity. Only spaces of this type,
whose energy, linear 3-momentum, and intrinsic angular momentum vanish, would
be candidates for creatable universes, that is, for universes which could have
arisen fr... | [
{
"created": "Tue, 8 May 2007 08:52:22 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Jul 2007 11:59:41 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Ferrando",
"Joan Josep",
""
],
[
"Lapiedra",
"Ramon",
""
],
[
"Morales",
"Juan Antonio",
""
]
] | We consider the question of properly defining energy and momenta for non asymptotic Minkowskian spaces in general relativity. Only spaces of this type, whose energy, linear 3-momentum, and intrinsic angular momentum vanish, would be candidates for creatable universes, that is, for universes which could have arisen from... |
gr-qc/9812032 | Edward Teo | Christopher J. Fewster, Edward Teo | Bounds on negative energy densities in static space-times | 22 pages, 5 figures; LaTeX; minor changes made | Phys. Rev. D 59, 104016 (1999) | 10.1103/PhysRevD.59.104016 | DAMTP-1998-160 | gr-qc | null | Certain exotic phenomena in general relativity, such as backward time travel,
appear to require the presence of matter with negative energy. While quantum
fields are a possible source of negative energy densities, there are lower
bounds - known as quantum inequalities - that constrain their duration and
magnitude. In... | [
{
"created": "Thu, 10 Dec 1998 10:44:17 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Feb 1999 16:56:09 GMT",
"version": "v2"
}
] | 2016-08-25 | [
[
"Fewster",
"Christopher J.",
""
],
[
"Teo",
"Edward",
""
]
] | Certain exotic phenomena in general relativity, such as backward time travel, appear to require the presence of matter with negative energy. While quantum fields are a possible source of negative energy densities, there are lower bounds - known as quantum inequalities - that constrain their duration and magnitude. In t... |
1603.04876 | Andrea Maselli | Andrea Maselli, Hector O. Silva, Masato Minamitsuji and Emanuele Berti | Neutron stars in Horndeski gravity | Minor changes to match the version appearing on PRD | Phys. Rev. D 93, 124056 (2016) | 10.1103/PhysRevD.93.124056 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Horndeski's theory of gravity is the most general scalar-tensor theory with a
single scalar whose equations of motion contain at most second-order
derivatives. A subsector of Horndeski's theory known as "Fab Four" gravity
allows for dynamical self-tuning of the quantum vacuum energy, and therefore it
has received par... | [
{
"created": "Tue, 15 Mar 2016 20:28:29 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Mar 2016 19:00:59 GMT",
"version": "v2"
},
{
"created": "Fri, 17 Jun 2016 07:33:19 GMT",
"version": "v3"
}
] | 2016-06-29 | [
[
"Maselli",
"Andrea",
""
],
[
"Silva",
"Hector O.",
""
],
[
"Minamitsuji",
"Masato",
""
],
[
"Berti",
"Emanuele",
""
]
] | Horndeski's theory of gravity is the most general scalar-tensor theory with a single scalar whose equations of motion contain at most second-order derivatives. A subsector of Horndeski's theory known as "Fab Four" gravity allows for dynamical self-tuning of the quantum vacuum energy, and therefore it has received parti... |
2105.12573 | Javier Relancio | J.J. Relancio | Geometry of multi-particle systems with a relativistic deformed
kinematics and the relative locality principle | 14 pages | Phys. Rev. D 104, 024017 (2021) | 10.1103/PhysRevD.104.024017 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There is a vast literature showing the connection between a deformed
relativistic kinematics and a curved momentum space, and, in particular, how
the former can be obtained from the geometrical properties of the latter.
However, there is not any mention about the geometry of a multi-particle system
making manifest a ... | [
{
"created": "Mon, 24 May 2021 09:54:29 GMT",
"version": "v1"
}
] | 2021-07-14 | [
[
"Relancio",
"J. J.",
""
]
] | There is a vast literature showing the connection between a deformed relativistic kinematics and a curved momentum space, and, in particular, how the former can be obtained from the geometrical properties of the latter. However, there is not any mention about the geometry of a multi-particle system making manifest a po... |
0712.1716 | Jan Steinhoff | Jan Steinhoff, Steven Hergt, Gerhard Sch\"afer | The next-to-leading order gravitational spin(1)-spin(2) dynamics in
Hamiltonian form | REVTeX4, 5 pages, published version | Phys.Rev.D77:081501,2008 | 10.1103/PhysRevD.77.081501 | null | gr-qc astro-ph.HE | null | Based on recent developments by the authors a next-to-leading order
spin(1)-spin(2) Hamiltonian is derived for the first time. The result is
obtained within the canonical formalism of Arnowitt, Deser, and Misner (ADM)
utilizing their generalized isotropic coordinates. A comparison with other
methods is given.
| [
{
"created": "Tue, 11 Dec 2007 14:06:14 GMT",
"version": "v1"
},
{
"created": "Tue, 20 May 2008 18:16:45 GMT",
"version": "v2"
}
] | 2010-02-16 | [
[
"Steinhoff",
"Jan",
""
],
[
"Hergt",
"Steven",
""
],
[
"Schäfer",
"Gerhard",
""
]
] | Based on recent developments by the authors a next-to-leading order spin(1)-spin(2) Hamiltonian is derived for the first time. The result is obtained within the canonical formalism of Arnowitt, Deser, and Misner (ADM) utilizing their generalized isotropic coordinates. A comparison with other methods is given. |
2303.17238 | Markus B. Fr\"ob | Markus B. Fr\"ob, Albert Much, Kyriakos Papadopoulos | Non-commutative coordinates from quantum gravity | Proceedings of the Corfu Summer Institute 2022 "School and Workshops
on Elementary Particle Physics and Gravity". Based on arXiv:2207.03345
[gr-qc]. 12 pages | PoS(CORFU2022) 436 (2023) 307 | 10.22323/1.436.0307 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Local observables in (perturbative) quantum gravity are notoriously hard to
define, since the gauge symmetry of gravity -- diffeomorphisms -- moves points
on the manifold. In particular, this is a problem for backgrounds of high
symmetry such as Minkowski space or de Sitter spacetime which describes the
early inflati... | [
{
"created": "Thu, 30 Mar 2023 09:14:19 GMT",
"version": "v1"
}
] | 2023-11-14 | [
[
"Fröb",
"Markus B.",
""
],
[
"Much",
"Albert",
""
],
[
"Papadopoulos",
"Kyriakos",
""
]
] | Local observables in (perturbative) quantum gravity are notoriously hard to define, since the gauge symmetry of gravity -- diffeomorphisms -- moves points on the manifold. In particular, this is a problem for backgrounds of high symmetry such as Minkowski space or de Sitter spacetime which describes the early inflation... |
0801.1984 | Emre Kahya Mr. | E. O. Kahya | A Decisive test to confirm or rule out the existence of dark matter
emulators using gravitational wave observations | 4 Pages, no figures, Contributed to 12th Annual Gravitational Wave
Data Analysis Workshop (GWDAW-12 2007): Connecting Gravitational Waves with
Observational Astrophysics, Cambridge, Massachusetts, 13-16 Dec 2007 | Class.Quant.Grav.25:184008,2008 | 10.1088/0264-9381/25/18/184008 | UFIFT-QG-08-01 | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider stable modified theories of gravity that reproduce galactic
rotation curves and the observed amount of weak lensing without dark matter. In
any such model gravity waves follow a different geodesic from that of other
massless particles. For a specific class of models which we call "dark matter
emulators," ... | [
{
"created": "Sun, 13 Jan 2008 21:00:08 GMT",
"version": "v1"
},
{
"created": "Sun, 19 Oct 2008 15:04:33 GMT",
"version": "v2"
}
] | 2008-11-07 | [
[
"Kahya",
"E. O.",
""
]
] | We consider stable modified theories of gravity that reproduce galactic rotation curves and the observed amount of weak lensing without dark matter. In any such model gravity waves follow a different geodesic from that of other massless particles. For a specific class of models which we call "dark matter emulators," ov... |
gr-qc/9302001 | Dadhich | L. K. Patel and N. Dadhich | Singularity Free Inhomogeneous Cosmological Stiff Fluid Models | Plain TeX, 6 Pages, IUCAA preprint IUCAA- 1/93 | null | null | null | gr-qc | null | We present a singularity free class of inhomogeneous cylindrical universes
filled with stiff perfect fluid $(\rho = p)$. Its matter free $ (\rho = 0)$
limit yield two distinct vacuum spacetimes which can be considered as analogues
of Kasner solution for inhomogeneous singularity free spacetime.
| [
{
"created": "Mon, 1 Feb 1993 14:40:16 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Patel",
"L. K.",
""
],
[
"Dadhich",
"N.",
""
]
] | We present a singularity free class of inhomogeneous cylindrical universes filled with stiff perfect fluid $(\rho = p)$. Its matter free $ (\rho = 0)$ limit yield two distinct vacuum spacetimes which can be considered as analogues of Kasner solution for inhomogeneous singularity free spacetime. |
1607.07022 | Naoki Tsukamoto | Naoki Tsukamoto | Strong deflection limit analysis and gravitational lensing of an Ellis
wormhole | 23 pages, 1 figure, minor correction, title changed, accepted for
publication in Physical Review D | Phys. Rev. D 94, 124001 (2016) | 10.1103/PhysRevD.94.124001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Observations of gravitational lenses in strong gravitational fields give us a
clue to understanding dark compact objects. In this paper, we extend a method
to obtain a deflection angle in a strong deflection limit provided by Bozza
[Phys. Rev. D 66, 103001 (2002)] to apply to ultrastatic spacetimes. We also
discuss o... | [
{
"created": "Sun, 24 Jul 2016 10:08:34 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Sep 2016 14:20:42 GMT",
"version": "v2"
},
{
"created": "Sun, 27 Nov 2016 13:26:38 GMT",
"version": "v3"
}
] | 2016-12-05 | [
[
"Tsukamoto",
"Naoki",
""
]
] | Observations of gravitational lenses in strong gravitational fields give us a clue to understanding dark compact objects. In this paper, we extend a method to obtain a deflection angle in a strong deflection limit provided by Bozza [Phys. Rev. D 66, 103001 (2002)] to apply to ultrastatic spacetimes. We also discuss on ... |
gr-qc/9305006 | null | P.F. Gonzalez-Diaz | The Quantum Sphaleron | 8 pages, IMAFF-RC-01-93# | Phys.Lett. B307 (1993) 362-366 | 10.1016/0370-2693(93)90233-8 | null | gr-qc | null | A gravitational instanton is found that can tunnel into a new more stable
vacuum phase where diffeomorphism invariance is broken and pitchfork
bifurcations develop. This tunnelling process involves a double sphaleron-like
transition which is associated with an extra level of quantization which is
above that is contai... | [
{
"created": "Fri, 7 May 1993 10:24:08 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Gonzalez-Diaz",
"P. F.",
""
]
] | A gravitational instanton is found that can tunnel into a new more stable vacuum phase where diffeomorphism invariance is broken and pitchfork bifurcations develop. This tunnelling process involves a double sphaleron-like transition which is associated with an extra level of quantization which is above that is containe... |
1304.6632 | Valentin Bonzom | Valentin Bonzom, Bianca Dittrich | Bubble divergences and gauge symmetries in spin foams | 28 pages | Phys. Rev. D 88, 124021 (2013) | 10.1103/PhysRevD.88.124021 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spin foams are candidate state-sum models for transition amplitudes in
quantum gravity. An active research subject is to identify the possible
divergences of spin foam models, or alternatively to show that models are
finite. We will discuss in detail the (non--occurrence of) divergences in the
Barrett-Crane model, fo... | [
{
"created": "Wed, 24 Apr 2013 15:36:39 GMT",
"version": "v1"
}
] | 2013-12-16 | [
[
"Bonzom",
"Valentin",
""
],
[
"Dittrich",
"Bianca",
""
]
] | Spin foams are candidate state-sum models for transition amplitudes in quantum gravity. An active research subject is to identify the possible divergences of spin foam models, or alternatively to show that models are finite. We will discuss in detail the (non--occurrence of) divergences in the Barrett-Crane model, form... |
1302.2859 | Larry Ford | L. H. Ford and Thomas A. Roman | Negative Energy Seen By Accelerated Observers | 26 pages, 3 figures | Phys. Rev. D 87, 085001 (2013) | 10.1103/PhysRevD.87.085001 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The sampled negative energy density seen by inertial observers, in arbitrary
quantum states is limited by quantum inequalities, which take the form of an
inverse relation between the magnitude and duration of the negative energy. The
quantum inequalities severely limit the utilization of negative energy to
produce gr... | [
{
"created": "Tue, 12 Feb 2013 16:49:05 GMT",
"version": "v1"
}
] | 2014-10-14 | [
[
"Ford",
"L. H.",
""
],
[
"Roman",
"Thomas A.",
""
]
] | The sampled negative energy density seen by inertial observers, in arbitrary quantum states is limited by quantum inequalities, which take the form of an inverse relation between the magnitude and duration of the negative energy. The quantum inequalities severely limit the utilization of negative energy to produce gros... |
2309.08768 | Jo\~ao Lu\'is Rosa | Jo\~ao Lu\'is Rosa, Nailya Ganiyeva, Francisco S. N. Lobo | Non-exotic traversable wormholes in $f\left(R,T_{ab}T^{ab}\right)$
gravity | 14 pages, 6 figures | EPJC 83, Article number: 1040 (2023) | 10.1140/epjc/s10052-023-12232-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we analyze traversable wormhole spacetimes in the framework of a
covariant generalization of Einstein's General Relativity known as
energy-momentum squared gravity, or $f\left(R,\mathcal T\right)$ gravity, where
$R$ is the Ricci scalar, $\mathcal T=T_{ab}T^{ab}$, and $T_{ab}$ is the
energy-momentum tenso... | [
{
"created": "Fri, 15 Sep 2023 21:19:01 GMT",
"version": "v1"
}
] | 2023-11-16 | [
[
"Rosa",
"João Luís",
""
],
[
"Ganiyeva",
"Nailya",
""
],
[
"Lobo",
"Francisco S. N.",
""
]
] | In this work we analyze traversable wormhole spacetimes in the framework of a covariant generalization of Einstein's General Relativity known as energy-momentum squared gravity, or $f\left(R,\mathcal T\right)$ gravity, where $R$ is the Ricci scalar, $\mathcal T=T_{ab}T^{ab}$, and $T_{ab}$ is the energy-momentum tensor.... |
1704.05899 | Jorge Ovalle | Jorge Ovalle | Decoupling gravitational sources in general relativity: from perfect to
anisotropic fluids | 5 pages, typos corrected | Phys. Rev. D 95, 104019 (2017) | 10.1103/PhysRevD.95.104019 | null | gr-qc astro-ph.SR hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show the first simple, systematic and direct approach to decoupling
gravitational sources in general relativity. As a direct application, a robust
and simple way to generate anisotropic solutions for self-gravitating systems
from perfect fluid solutions is presented.
| [
{
"created": "Wed, 19 Apr 2017 19:06:20 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Apr 2017 23:29:25 GMT",
"version": "v2"
}
] | 2017-05-24 | [
[
"Ovalle",
"Jorge",
""
]
] | We show the first simple, systematic and direct approach to decoupling gravitational sources in general relativity. As a direct application, a robust and simple way to generate anisotropic solutions for self-gravitating systems from perfect fluid solutions is presented. |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.