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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1205.2685 | Ernesto F. Eiroa | Ernesto F. Eiroa, Griselda Figueroa-Aguirre | Thin-shell wormholes with a generalized Chaplygin gas in
Einstein-Born-Infeld theory | 9 pages, 6 figures; v2: improved version | Eur. Phys. J. C (2012) 72:2240 | 10.1140/epjc/s10052-012-2240-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct spherically symmetric thin-shell wormholes supported by a
generalized Chaplygin gas in Born-Infeld electrodynamics coupled to Einstein
gravity, and we analyze their stability under radial perturbations. For
different values of the Born-Infeld parameter and the charge, we compare the
results with those ob... | [
{
"created": "Fri, 11 May 2012 19:50:52 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Nov 2012 19:29:43 GMT",
"version": "v2"
}
] | 2020-07-22 | [
[
"Eiroa",
"Ernesto F.",
""
],
[
"Figueroa-Aguirre",
"Griselda",
""
]
] | We construct spherically symmetric thin-shell wormholes supported by a generalized Chaplygin gas in Born-Infeld electrodynamics coupled to Einstein gravity, and we analyze their stability under radial perturbations. For different values of the Born-Infeld parameter and the charge, we compare the results with those obta... |
gr-qc/0102065 | Pietro Menotti | Pietro Menotti | Hamiltonian structure of 2+1 dimensional gravity | 13 pages,2 figures,latex, Plenary talk at SIGRAV2000 Conference | null | null | IFUP-TH/05-2001 | gr-qc hep-th | null | A summary is given of some results and perspectives of the hamiltonian ADM
approach to 2+1 dimensional gravity. After recalling the classical results for
closed universes in absence of matter we go over the the case in which matter
is present in the form of point spinless particles. Here the maximally slicing
gauge p... | [
{
"created": "Wed, 14 Feb 2001 08:13:11 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Menotti",
"Pietro",
""
]
] | A summary is given of some results and perspectives of the hamiltonian ADM approach to 2+1 dimensional gravity. After recalling the classical results for closed universes in absence of matter we go over the the case in which matter is present in the form of point spinless particles. Here the maximally slicing gauge pro... |
1408.4686 | Peter K.F. Kuhfittig | Peter K.F. Kuhfittig | Exactly solvable wormhole and cosmological models with a barotropic
equation of state | Published by Acta Physica Polonica B with the title "Exactly solvable
wormhole and cosmological models with a barotropic equation of state." | Acta Phys. Pol. B, vol. 47, 1263-1272 (2016) | 10.5506/APhysPolB.47.1263 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An exact solution of the Einstein field equations given the barotropic
equation of state $p=\omega\rho$ yields two possible models: (1) if $\omega
<-1$, we obtain the most general possible anisotropic model for wormholes
supported by phantom energy and (2) if $\omega >0$, we obtain a model for
galactic rotation curve... | [
{
"created": "Wed, 20 Aug 2014 15:00:47 GMT",
"version": "v1"
},
{
"created": "Sun, 28 Feb 2016 14:27:02 GMT",
"version": "v2"
},
{
"created": "Mon, 20 Jun 2016 14:34:25 GMT",
"version": "v3"
}
] | 2016-06-29 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | An exact solution of the Einstein field equations given the barotropic equation of state $p=\omega\rho$ yields two possible models: (1) if $\omega <-1$, we obtain the most general possible anisotropic model for wormholes supported by phantom energy and (2) if $\omega >0$, we obtain a model for galactic rotation curves.... |
2309.03816 | Eneko Aranguren | Eneko Aranguren and Jos\'e A. Font and Nicolas Sanchis-Gual and Ra\"ul
Vera | Revisiting the $I$-Love-$Q$ relations for superfluid neutron stars | 18 pages, 3 figures. Reference added, typos and minor corrections,
and some discussion expanded, to agree with the published version | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the tidal problem and the resulting $I$-Love-$Q$ approximate
universal relations for rotating superfluid neutron stars in the Hartle-Thorne
formalism. Superfluid stars are described in this work by means of a two-fluid
model consisting of superfluid neutrons and all other charged constituents. We
employ a st... | [
{
"created": "Thu, 7 Sep 2023 16:12:27 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Nov 2023 14:36:28 GMT",
"version": "v2"
}
] | 2023-11-23 | [
[
"Aranguren",
"Eneko",
""
],
[
"Font",
"José A.",
""
],
[
"Sanchis-Gual",
"Nicolas",
""
],
[
"Vera",
"Raül",
""
]
] | We study the tidal problem and the resulting $I$-Love-$Q$ approximate universal relations for rotating superfluid neutron stars in the Hartle-Thorne formalism. Superfluid stars are described in this work by means of a two-fluid model consisting of superfluid neutrons and all other charged constituents. We employ a stat... |
2302.14080 | Mohammad Ali Gorji | Mohammad Ali Gorji, Misao Sasaki | Primordial-tensor-induced stochastic gravitational waves | 7 pages, 5 figures; similarity with the neutrino oscillation is
discussed; version to appear in PLB | null | null | YITP-23-19 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmological stochastic gravitational waves (GWs) induced by a spectator
field are usually expected to have an amplitude very small compared with those
generated by the curvature perturbation, or equivalently by a field dominating
the universe. On the contrary to this expectation, we show that a spectator
field that ... | [
{
"created": "Mon, 27 Feb 2023 19:00:14 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Oct 2023 12:46:07 GMT",
"version": "v2"
}
] | 2023-10-04 | [
[
"Gorji",
"Mohammad Ali",
""
],
[
"Sasaki",
"Misao",
""
]
] | Cosmological stochastic gravitational waves (GWs) induced by a spectator field are usually expected to have an amplitude very small compared with those generated by the curvature perturbation, or equivalently by a field dominating the universe. On the contrary to this expectation, we show that a spectator field that pr... |
2102.09045 | Bivudutta Mishra Dr. | Sankarsan Tarai, Pratik P Ray, B. Mishra, S.K. Tripathy | Effect of bulk viscosity in cosmic acceleration | 11 pages, 8 Figures. Accepted version IJGMMP | Int. J. Geom. Methods Mod. Phys., 19(04), 2250060 (2022) | 10.1142/S0219887822500608 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we have investigated the late time cosmic acceleration issue
in the context of $f(R,T)$ gravity. The matter field is considered to be that
of viscous fluid. The model has been framed as a mathematical formalism and the
effect of viscous fluid on the cosmic expansion has been shown. The equation of
stat... | [
{
"created": "Tue, 16 Feb 2021 07:14:32 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Mar 2021 14:42:17 GMT",
"version": "v2"
},
{
"created": "Sun, 19 Dec 2021 15:09:00 GMT",
"version": "v3"
},
{
"created": "Tue, 21 Dec 2021 07:14:01 GMT",
"version": "v4"
}
] | 2022-07-19 | [
[
"Tarai",
"Sankarsan",
""
],
[
"Ray",
"Pratik P",
""
],
[
"Mishra",
"B.",
""
],
[
"Tripathy",
"S. K.",
""
]
] | In this paper, we have investigated the late time cosmic acceleration issue in the context of $f(R,T)$ gravity. The matter field is considered to be that of viscous fluid. The model has been framed as a mathematical formalism and the effect of viscous fluid on the cosmic expansion has been shown. The equation of state ... |
0708.1933 | Carlos Kozameh | Carlos Kozameh, Oscar Reula and Heinz-Otto Kreiss | On the well posedness of Robinson Trautman Maxwell solutions | 9 pages | Class.Quant.Grav.25:025004,2008 | 10.1088/0264-9381/25/2/025004 | null | gr-qc | null | We show that the so called Robinson-Trautman-Maxwell equations do not
constitute a well posed initial value problem. That is, the dependence of the
solution on the initial data is not continuous in any norm built out from the
initial data and a finite number of its derivatives. Thus, they can not be used
to solve for... | [
{
"created": "Tue, 14 Aug 2007 17:49:40 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kozameh",
"Carlos",
""
],
[
"Reula",
"Oscar",
""
],
[
"Kreiss",
"Heinz-Otto",
""
]
] | We show that the so called Robinson-Trautman-Maxwell equations do not constitute a well posed initial value problem. That is, the dependence of the solution on the initial data is not continuous in any norm built out from the initial data and a finite number of its derivatives. Thus, they can not be used to solve for s... |
1806.09675 | Henri Roesch | Henri Roesch | Quasi-Round MOTSs and Stability of the Schwarzschild Null Penrose
Inequality | null | null | null | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In recent work, the notion of Double Convexity for a foliation of a conical
null hypersurface was introduced to give a proof, if satisfied, of the Null
Penrose Inequality. Double Convexity constrains the geometry of a Marginally
Outer Trapped Surface (MOTS), called a quasi-round MOTS. In the first part of
this paper,... | [
{
"created": "Mon, 25 Jun 2018 19:25:45 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Jan 2021 19:36:49 GMT",
"version": "v2"
}
] | 2021-01-07 | [
[
"Roesch",
"Henri",
""
]
] | In recent work, the notion of Double Convexity for a foliation of a conical null hypersurface was introduced to give a proof, if satisfied, of the Null Penrose Inequality. Double Convexity constrains the geometry of a Marginally Outer Trapped Surface (MOTS), called a quasi-round MOTS. In the first part of this paper, f... |
gr-qc/9701052 | null | Giorgio Immirzi | Quantum Gravity and Regge Calculus | 8 pages, Latex with esprc2.sty, epsf.tex, 3 figures; contribution to
the proceedings of the II meeting on Constrained Dynamics and Quantum
Gravity, Santa Margherita Ligure | Nucl.Phys.Proc.Suppl. 57 (1997) 65-72 | 10.1016/S0920-5632(97)00354-X | DFUPG 119/97 | gr-qc | null | This is an informal review of the formulation of canonical general relativity
and of its implications for quantum gravity; the various versions are compared,
both in the continuum and in a discretized approximation suggested by Regge
calculus. I also show that the weakness of the link with the geometric content
of th... | [
{
"created": "Thu, 23 Jan 1997 17:38:44 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Immirzi",
"Giorgio",
""
]
] | This is an informal review of the formulation of canonical general relativity and of its implications for quantum gravity; the various versions are compared, both in the continuum and in a discretized approximation suggested by Regge calculus. I also show that the weakness of the link with the geometric content of the ... |
1908.03261 | Ra\'ul Carballo-Rubio | Ra\'ul Carballo-Rubio, Francesco Di Filippo, Stefano Liberati and Matt
Visser | Opening the Pandora's box at the core of black holes | 5 pages, 3 figures | Class. Quant. Grav. 37 (2020) 14, 145005 | 10.1088/1361-6382/ab8141 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Unless the reality of spacetime singularities is assumed, astrophysical black
holes cannot be identical to their mathematical counterparts obtained as
solutions of the Einstein field equations. Mechanisms for singularity
regularization would spark deviations with respect to the predictions of
general relativity, alth... | [
{
"created": "Thu, 8 Aug 2019 20:27:08 GMT",
"version": "v1"
}
] | 2021-02-01 | [
[
"Carballo-Rubio",
"Raúl",
""
],
[
"Di Filippo",
"Francesco",
""
],
[
"Liberati",
"Stefano",
""
],
[
"Visser",
"Matt",
""
]
] | Unless the reality of spacetime singularities is assumed, astrophysical black holes cannot be identical to their mathematical counterparts obtained as solutions of the Einstein field equations. Mechanisms for singularity regularization would spark deviations with respect to the predictions of general relativity, althou... |
1906.08064 | Clifford M. Will | Clifford M. Will | Compact binary inspiral: Nature is perfectly happy with a circle | 14 pages, 5 figures, version aligned with published paper | Classical and Quantum Gravity 36, 195013 (2019) | 10.1088/1361-6382/ab41d0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is standard lore that gravitational radiation reaction circularizes the
orbits of inspiralling binary systems. But in recent papers, Loutrel et al.
have argued that at late times in such inspirals, one measure of eccentricity
actually increases, and that this could have observable consequences. We show
that this v... | [
{
"created": "Wed, 19 Jun 2019 12:27:27 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Oct 2019 09:50:32 GMT",
"version": "v2"
}
] | 2019-10-14 | [
[
"Will",
"Clifford M.",
""
]
] | It is standard lore that gravitational radiation reaction circularizes the orbits of inspiralling binary systems. But in recent papers, Loutrel et al. have argued that at late times in such inspirals, one measure of eccentricity actually increases, and that this could have observable consequences. We show that this var... |
gr-qc/0403075 | Leonardo Fernandez-Jambrina | F.J. Chinea, L. Fernandez-Jambrina, J.M.M. Senovilla | A singularity-free space-time | Latex 2.09, 14 pages | Phys.Rev. D45 (1992) 481 | 10.1103/PhysRevD.45.481 | null | gr-qc | null | We show that the solution published in Ref.1 is geodesically complete and
singularity-free. We also prove that the solution satisfies the stronger energy
and causality conditions, such as global hyperbolicity, causal symmetry and
causal stability. A detailed discussion about which assumptions in the
singularity theor... | [
{
"created": "Wed, 17 Mar 2004 12:07:25 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Chinea",
"F. J.",
""
],
[
"Fernandez-Jambrina",
"L.",
""
],
[
"Senovilla",
"J. M. M.",
""
]
] | We show that the solution published in Ref.1 is geodesically complete and singularity-free. We also prove that the solution satisfies the stronger energy and causality conditions, such as global hyperbolicity, causal symmetry and causal stability. A detailed discussion about which assumptions in the singularity theorem... |
1308.3450 | Hoda Farahani | J. Sadeghi, M. Khurshudyan, A. Movsisyan and H. Farahani | Interacting Ghost Dark Energy Models with Variable $G$ and $\Lambda$ | 20 pages, 21 figures. arXiv admin note: substantial text overlap with
arXiv:1308.1819 | JCAP12(2013)031 | 10.1088/1475-7516/2013/12/031 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we consider several phenomenological models of variable
$\Lambda$. Model of a flat Universe with variable $\Lambda$ and $G$ is
accepted. It is well known, that varying $G$ and $\Lambda$ gives rise to
modified field equations and modified conservation laws, which gives rise to
many different manipulation... | [
{
"created": "Thu, 15 Aug 2013 16:21:19 GMT",
"version": "v1"
}
] | 2013-12-17 | [
[
"Sadeghi",
"J.",
""
],
[
"Khurshudyan",
"M.",
""
],
[
"Movsisyan",
"A.",
""
],
[
"Farahani",
"H.",
""
]
] | In this paper we consider several phenomenological models of variable $\Lambda$. Model of a flat Universe with variable $\Lambda$ and $G$ is accepted. It is well known, that varying $G$ and $\Lambda$ gives rise to modified field equations and modified conservation laws, which gives rise to many different manipulations ... |
0705.0789 | Parvin Moyassari | Parvin Moyassari | On the construction of the Hadamard sates in two dimensions | 10 pages | null | null | null | gr-qc | null | The two dimensional analog of the Hadamard state condition is used to specify
the local Hadamard states associated with a linear quantum field coupled to a
two dimensional gravitational background. To characterize a local Hadamard
state corresponding to a physical vacuum state, we apply a superselection rule
in which... | [
{
"created": "Sun, 6 May 2007 09:26:10 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Moyassari",
"Parvin",
""
]
] | The two dimensional analog of the Hadamard state condition is used to specify the local Hadamard states associated with a linear quantum field coupled to a two dimensional gravitational background. To characterize a local Hadamard state corresponding to a physical vacuum state, we apply a superselection rule in which t... |
2206.13940 | Hooman Moradpour | H. Moradpour, A. H. Ziaie, N. Sadeghnezhad | Generalized uncertainty principle and burning stars | null | Front. Astron. Space Sci. 9, 936352 (2022) | 10.3389/fspas.2022.936352 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Gamow's theory of the implications of quantum tunneling on the star burning
has two cornerstones including quantum mechanics and equipartition theorem. It
has vastly been proposed that both of these foundations are affected by the
existence of a non-zero minimum for length which usually appears in quantum
gravity sce... | [
{
"created": "Sat, 25 Jun 2022 07:00:17 GMT",
"version": "v1"
}
] | 2022-09-21 | [
[
"Moradpour",
"H.",
""
],
[
"Ziaie",
"A. H.",
""
],
[
"Sadeghnezhad",
"N.",
""
]
] | Gamow's theory of the implications of quantum tunneling on the star burning has two cornerstones including quantum mechanics and equipartition theorem. It has vastly been proposed that both of these foundations are affected by the existence of a non-zero minimum for length which usually appears in quantum gravity scena... |
0906.1190 | Yoelsy Leyva | Israel Quiros, Yoelsy Leyva, Yunelsy Napoles | A Note on de Sitter Embedding of $f(R)$ Theories | 8 pages, Several references added | Phys.Rev.D80:024022,2009 | 10.1103/PhysRevD.80.024022 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The consequences of the constraints which de Sitter embedding of $f(R)$
theories imposes on the Lagrangian's parameters, are investigated within the
metric formalism. It is shown, in particular, that several common $f(R)$
Lagrangians do not actually admit such an embedding. Otherwise, asymptotic
matching of local sol... | [
{
"created": "Fri, 5 Jun 2009 19:46:33 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Jun 2009 20:49:54 GMT",
"version": "v2"
}
] | 2009-09-02 | [
[
"Quiros",
"Israel",
""
],
[
"Leyva",
"Yoelsy",
""
],
[
"Napoles",
"Yunelsy",
""
]
] | The consequences of the constraints which de Sitter embedding of $f(R)$ theories imposes on the Lagrangian's parameters, are investigated within the metric formalism. It is shown, in particular, that several common $f(R)$ Lagrangians do not actually admit such an embedding. Otherwise, asymptotic matching of local solut... |
gr-qc/9406034 | Susan | Naresh Dadhich and L.K. Patel | Uniqueness of the non-singular family and characterisation of
cosmological models | TeX pages 13, IUCAA-14/94 | null | null | null | gr-qc | null | We prove that for an orthogonal spacetime metric separable in space and time
in comoving coordinates, the requirements of perfect fluid and non-singularity
single out the unique family of singularity free cosmological models. Further
homogeneous models could only be Bianchi I or FLRW while inhomogeneous ones can
be w... | [
{
"created": "Tue, 21 Jun 1994 13:43:27 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Sep 1994 16:24:06 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Dadhich",
"Naresh",
""
],
[
"Patel",
"L. K.",
""
]
] | We prove that for an orthogonal spacetime metric separable in space and time in comoving coordinates, the requirements of perfect fluid and non-singularity single out the unique family of singularity free cosmological models. Further homogeneous models could only be Bianchi I or FLRW while inhomogeneous ones can be wit... |
1806.11462 | Adrian Ciprian Sporea | Ciprian A. Sporea | Fermion scattering by a class of Bardeen black holes | v2: 11 pages (two-collumn), 7 figs., matches the published version in
Chinese Physics C | Chinese Physics C Vol. 43, No. 3 (2019) 035104 | 10.1088/1674-1137/43/3/035104 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper the scattering of fermions by a class of Bardeen black holes is
investigated. After obtaining the scattering modes by solving the Dirac
equation in this geometry, we use the partial wave method to derive an
analytical expression for the phase shifts that enter into the definitions of
partial amplitudes ... | [
{
"created": "Fri, 29 Jun 2018 15:08:21 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Mar 2019 11:24:02 GMT",
"version": "v2"
}
] | 2019-03-13 | [
[
"Sporea",
"Ciprian A.",
""
]
] | In this paper the scattering of fermions by a class of Bardeen black holes is investigated. After obtaining the scattering modes by solving the Dirac equation in this geometry, we use the partial wave method to derive an analytical expression for the phase shifts that enter into the definitions of partial amplitudes th... |
1304.0467 | Jorge Rocha | Lu\'is C. B. Crispino, Atsushi Higuchi, Ednilton S. Oliveira and Jorge
V. Rocha | Greybody factors for non-minimally coupled scalar fields in
Schwarzschild-de Sitter spacetime | 12 pages, 7 figures | null | 10.1103/PhysRevD.87.104034 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the greybody factors for non-minimally coupled scalar fields in
four-dimensional Schwarzschild-de Sitter spacetime. In particular, we
demonstrate that the zero-angular-momentum greybody factor generically tends to
zero in the zero-frequency limit like frequency squared if there is
non-vanishing coupling to... | [
{
"created": "Mon, 1 Apr 2013 20:24:18 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"Crispino",
"Luís C. B.",
""
],
[
"Higuchi",
"Atsushi",
""
],
[
"Oliveira",
"Ednilton S.",
""
],
[
"Rocha",
"Jorge V.",
""
]
] | We compute the greybody factors for non-minimally coupled scalar fields in four-dimensional Schwarzschild-de Sitter spacetime. In particular, we demonstrate that the zero-angular-momentum greybody factor generically tends to zero in the zero-frequency limit like frequency squared if there is non-vanishing coupling to t... |
gr-qc/9609006 | Remo Garattini | Remo Garattini | Wormholes and Black Hole Pair Creation | Revtex 3.0, preprint,amsfonts 19 pages | Nuovo Cim. B113 (1998) 963-974 | null | null | gr-qc hep-th | null | We analyze the possibility of black holes pair creation induced by three
dimensional wormholes. Although this spacetime configuration is nowadays hard
to suppose, it can be very important in the early universe, when the wormhole
spacetime foam representation can be meaningful. We compare our approach with
the no-boun... | [
{
"created": "Sat, 31 Aug 1996 19:07:42 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Garattini",
"Remo",
""
]
] | We analyze the possibility of black holes pair creation induced by three dimensional wormholes. Although this spacetime configuration is nowadays hard to suppose, it can be very important in the early universe, when the wormhole spacetime foam representation can be meaningful. We compare our approach with the no-bounda... |
1306.0064 | Jiliang Jing | Weiping Yao, Jiliang Jing | Analytical study on holographic superconductors for Born-Infeld
electrodynamics in Gauss-Bonnet gravity with backreactions | 17 pages, 3 figures, 1 tale | JHEP 05 (2013) 101 | 10.1007/JHEP05(2013)101 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analytically study the holographic superconductors for Born-Infeld
electrodynamics in Gauss-Bonnet gravity with backreactions. We note that the
analytic method is still powerful for this complex system and the results
obtained by the analytical and numerical computations are consistent. We find
that the critical t... | [
{
"created": "Sat, 1 Jun 2013 02:34:21 GMT",
"version": "v1"
}
] | 2015-06-16 | [
[
"Yao",
"Weiping",
""
],
[
"Jing",
"Jiliang",
""
]
] | We analytically study the holographic superconductors for Born-Infeld electrodynamics in Gauss-Bonnet gravity with backreactions. We note that the analytic method is still powerful for this complex system and the results obtained by the analytical and numerical computations are consistent. We find that the critical tem... |
0706.0704 | Brendan Foster | Brendan Z. Foster | Strong field effects on binary systems in Einstein-aether theory | 23 pages, 1 figure; v2: fixed error in Eqn. (70) and resulting bounds
on c's | Phys.Rev.D76:084033,2007 | 10.1103/PhysRevD.76.084033 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | "Einstein-aether" theory is a generally covariant theory of gravity
containing a dynamical preferred frame. This article continues an examination
of effects on the motion of binary pulsar systems in this theory, by
incorporating effects due to strong fields in the vicinity of neutron star
pulsars. These effects are i... | [
{
"created": "Tue, 5 Jun 2007 17:00:18 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Sep 2008 11:28:46 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Foster",
"Brendan Z.",
""
]
] | "Einstein-aether" theory is a generally covariant theory of gravity containing a dynamical preferred frame. This article continues an examination of effects on the motion of binary pulsar systems in this theory, by incorporating effects due to strong fields in the vicinity of neutron star pulsars. These effects are inc... |
2203.04238 | Edward Wilson-Ewing | Viqar Husain, Jarod George Kelly, Robert Santacruz, Edward
Wilson-Ewing | On the fate of quantum black holes | 48 pages, 6 figures with multiple panels, code uploaded with source
files. v2: Clarifications added, references added and typos corrected | Phys. Rev. D 106, 024014 (2022) | 10.1103/PhysRevD.106.024014 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the quantum dynamics of the Lema\^itre-Tolman-Bondi space-times
using a polymer quantization prescription based on loop quantum cosmology that
incorporates fundamental discreteness. By solving an effective equation derived
from this quantization, we find analytical solutions for the Oppenheimer-Snyder
and th... | [
{
"created": "Tue, 8 Mar 2022 17:54:26 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Jun 2022 20:29:17 GMT",
"version": "v2"
}
] | 2022-07-13 | [
[
"Husain",
"Viqar",
""
],
[
"Kelly",
"Jarod George",
""
],
[
"Santacruz",
"Robert",
""
],
[
"Wilson-Ewing",
"Edward",
""
]
] | We study the quantum dynamics of the Lema\^itre-Tolman-Bondi space-times using a polymer quantization prescription based on loop quantum cosmology that incorporates fundamental discreteness. By solving an effective equation derived from this quantization, we find analytical solutions for the Oppenheimer-Snyder and thin... |
2006.02618 | Yan Peng | Yan Peng | Upper bounds on the compactness at the innermost light ring of
anisotropic horizonless spheres | 7 pages | null | 10.1140/epjc/s10052-020-8358-z | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the background of isotropic horizonless spheres, Hod recently provided an
analytical proof of a bound on the compactness at the innermost light ring with
the dominant energy and non-negative trace conditions. In this work, we extend
the discussion of isotropic spheres to anisotropic spheres. With the same
dominant... | [
{
"created": "Wed, 3 Jun 2020 09:48:57 GMT",
"version": "v1"
}
] | 2021-02-03 | [
[
"Peng",
"Yan",
""
]
] | In the background of isotropic horizonless spheres, Hod recently provided an analytical proof of a bound on the compactness at the innermost light ring with the dominant energy and non-negative trace conditions. In this work, we extend the discussion of isotropic spheres to anisotropic spheres. With the same dominant e... |
gr-qc/0612043 | Thomas B\"ackdahl | Thomas B\"ackdahl | Axisymmetric stationary solutions with arbitrary multipole moments | 12 pages | Class.Quant.Grav.24:2205-2215,2007 | 10.1088/0264-9381/24/9/004 | null | gr-qc | null | In this paper, the problem of finding an axisymmetric stationary spacetime
from a specified set of multipole moments, is studied. The condition on the
multipole moments, for existence of a solution, is formulated as a convergence
condition on a power series formed from the multipole moments. The methods in
this paper... | [
{
"created": "Thu, 7 Dec 2006 13:16:00 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bäckdahl",
"Thomas",
""
]
] | In this paper, the problem of finding an axisymmetric stationary spacetime from a specified set of multipole moments, is studied. The condition on the multipole moments, for existence of a solution, is formulated as a convergence condition on a power series formed from the multipole moments. The methods in this paper c... |
1904.06386 | Barak Shoshany | Barak Shoshany | Dual 2+1D Loop Quantum Gravity on the Edge | 42 pages, 3 figures; corrected minor typos and updated references | Phys. Rev. D 100, 026003 (2019) | 10.1103/PhysRevD.100.026003 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent paper, we introduced a new discretization scheme for gravity in
2+1 dimensions. Starting from the continuum theory, this new scheme allowed us
to rigorously obtain the discrete phase space of loop gravity, coupled to
particle-like "edge mode" degrees of freedom. In this work, we expand on that
result by c... | [
{
"created": "Fri, 12 Apr 2019 19:31:36 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Jul 2019 16:45:27 GMT",
"version": "v2"
},
{
"created": "Wed, 1 Apr 2020 19:12:58 GMT",
"version": "v3"
}
] | 2020-04-03 | [
[
"Shoshany",
"Barak",
""
]
] | In a recent paper, we introduced a new discretization scheme for gravity in 2+1 dimensions. Starting from the continuum theory, this new scheme allowed us to rigorously obtain the discrete phase space of loop gravity, coupled to particle-like "edge mode" degrees of freedom. In this work, we expand on that result by con... |
2302.04553 | Miquel Miravet-Ten\'es | Miquel Miravet-Ten\'es, Florencia L. Castillo, Roberto De Pietri,
Pablo Cerd\'a-Dur\'an, Jos\'e A. Font | Prospects for the inference of inertial modes from hypermassive neutron
stars with future gravitational-wave detectors | null | null | 10.1103/PhysRevD.107.103053 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Some recent, long-term numerical simulations of binary neutron star mergers
have shown that the long-lived remnants produced in such mergers might be
affected by convective instabilities. Those would trigger the excitation of
inertial modes, providing a potential method to improve our understanding of
the rotational ... | [
{
"created": "Thu, 9 Feb 2023 10:44:03 GMT",
"version": "v1"
},
{
"created": "Wed, 10 May 2023 14:01:07 GMT",
"version": "v2"
}
] | 2023-06-14 | [
[
"Miravet-Tenés",
"Miquel",
""
],
[
"Castillo",
"Florencia L.",
""
],
[
"De Pietri",
"Roberto",
""
],
[
"Cerdá-Durán",
"Pablo",
""
],
[
"Font",
"José A.",
""
]
] | Some recent, long-term numerical simulations of binary neutron star mergers have shown that the long-lived remnants produced in such mergers might be affected by convective instabilities. Those would trigger the excitation of inertial modes, providing a potential method to improve our understanding of the rotational an... |
gr-qc/0303049 | Joan Ferrando | J.J. Ferrando (U. de Valencia), J.A. Saez (U. de Valencia) | Gravito-magnetic vacuum spacetimes: kinematic restrictions | 6 pages, 0 figures | Class.Quant.Grav. 20 (2003) 2835-2840 | 10.1088/0264-9381/20/13/328 | null | gr-qc | null | We show that there are no vacuum solutions with a purely magnetic Weyl tensor
with respect to an observer submitted to kinematic restrictions involving first
order differential scalars. This result generalizes previous ones for the
vorticity-free and shear-free cases. We use a covariant approach which makes
evident t... | [
{
"created": "Wed, 12 Mar 2003 10:30:48 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Ferrando",
"J. J.",
"",
"U. de Valencia"
],
[
"Saez",
"J. A.",
"",
"U. de Valencia"
]
] | We show that there are no vacuum solutions with a purely magnetic Weyl tensor with respect to an observer submitted to kinematic restrictions involving first order differential scalars. This result generalizes previous ones for the vorticity-free and shear-free cases. We use a covariant approach which makes evident tha... |
1805.10278 | Bruno Le Floch | Bruno Le Floch and Philippe G. LeFloch | On the global evolution of self-gravitating matter. Nonlinear
interactions in Gowdy symmetry | 37 pages. v2: fix typos to match version published in 2019 | ARMA 233, 45-86 (2019) | 10.1007/s00205-018-01354-5 | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We are interested in the evolution of a compressible fluid under its
self-generated gravitational field. Assuming here Gowdy symmetry, we
investigate the algebraic structure of the Euler equations satisfied by the
mass density and velocity field. We exhibit several interaction functionals
that provide us with a unifo... | [
{
"created": "Fri, 25 May 2018 17:58:42 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Aug 2020 20:02:23 GMT",
"version": "v2"
}
] | 2020-11-30 | [
[
"Floch",
"Bruno Le",
""
],
[
"LeFloch",
"Philippe G.",
""
]
] | We are interested in the evolution of a compressible fluid under its self-generated gravitational field. Assuming here Gowdy symmetry, we investigate the algebraic structure of the Euler equations satisfied by the mass density and velocity field. We exhibit several interaction functionals that provide us with a uniform... |
gr-qc/0202095 | Christos G. Tsagas | Christos G. Tsagas (University of Cape Town) | Gravitational waves and cosmic magnetism; a cosmological approach | Minor changes. References added. To appear in Class. Quantum Grav | Class.Quant.Grav.19:3709-3722,2002 | 10.1088/0264-9381/19/14/311 | null | gr-qc astro-ph | null | We present the formalism for the covariant treatment of gravitational
radiation in a magnetized environment and discuss the implications of the field
for gravity waves in the cosmological context. Our geometrical approach brings
to the fore the tension properties of the magnetic force lines and reveals
their intricat... | [
{
"created": "Wed, 27 Feb 2002 12:15:21 GMT",
"version": "v1"
},
{
"created": "Sun, 19 May 2002 14:54:07 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Tsagas",
"Christos G.",
"",
"University of Cape Town"
]
] | We present the formalism for the covariant treatment of gravitational radiation in a magnetized environment and discuss the implications of the field for gravity waves in the cosmological context. Our geometrical approach brings to the fore the tension properties of the magnetic force lines and reveals their intricate ... |
0707.2748 | Thomas Sotiriou | Thomas P Sotiriou, Valerio Faraoni, Stefano Liberati | Theory of gravitation theories: a no-progress report | Invited paper in the Gravity Research Foundation 2007 special issue
to be published by Int. J. Mod. Phys. D | Int.J.Mod.Phys.D17:399-423,2008 | 10.1142/S0218271808012097 | null | gr-qc astro-ph hep-th | null | Already in the 1970s there where attempts to present a set of ground rules,
sometimes referred to as a theory of gravitation theories, which theories of
gravity should satisfy in order to be considered viable in principle and,
therefore, interesting enough to deserve further investigation. From this
perspective, an a... | [
{
"created": "Wed, 18 Jul 2007 15:35:24 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Mar 2008 04:50:18 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Sotiriou",
"Thomas P",
""
],
[
"Faraoni",
"Valerio",
""
],
[
"Liberati",
"Stefano",
""
]
] | Already in the 1970s there where attempts to present a set of ground rules, sometimes referred to as a theory of gravitation theories, which theories of gravity should satisfy in order to be considered viable in principle and, therefore, interesting enough to deserve further investigation. From this perspective, an alt... |
gr-qc/9810021 | Helia Hollmann | Helia R. Hollmann, Ruth M. Williams (Cambridge U., DAMTP) | 't Hooft's Polygon Approach Hyperbolically Revisited | 20 pages, 16 figure | null | null | DAMTP-R-98-26 | gr-qc | null | The initial data in the polygon approach to (2+1)D gravity coupled to point
particles are constrained by the vertex equations and the particle equations.
We establish the hyperbolic nature of the vertex equations and derive some
consequences. In particular we are able to identify the hyperbolic group of
motions as di... | [
{
"created": "Tue, 6 Oct 1998 15:32:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hollmann",
"Helia R.",
"",
"Cambridge U., DAMTP"
],
[
"Williams",
"Ruth M.",
"",
"Cambridge U., DAMTP"
]
] | The initial data in the polygon approach to (2+1)D gravity coupled to point particles are constrained by the vertex equations and the particle equations. We establish the hyperbolic nature of the vertex equations and derive some consequences. In particular we are able to identify the hyperbolic group of motions as disc... |
1009.1771 | Daniel Vanzella | William C. C. Lima, George E. A. Matsas, and Daniel A. T. Vanzella | Awaking the vacuum in relativistic stars | To appear in Phys. Rev. Lett | Phys.Rev.Lett.105:151102,2010 | 10.1103/PhysRevLett.105.151102 | null | gr-qc astro-ph.HE astro-ph.SR hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Void of any inherent structure in classical physics, the vacuum has revealed
to be incredibly crowded with all sorts of processes in relativistic quantum
physics. Yet, its direct effects are usually so subtle that its structure
remains almost as evasive as in classical physics. Here, in contrast, we report
on the dis... | [
{
"created": "Thu, 9 Sep 2010 13:15:29 GMT",
"version": "v1"
}
] | 2010-10-12 | [
[
"Lima",
"William C. C.",
""
],
[
"Matsas",
"George E. A.",
""
],
[
"Vanzella",
"Daniel A. T.",
""
]
] | Void of any inherent structure in classical physics, the vacuum has revealed to be incredibly crowded with all sorts of processes in relativistic quantum physics. Yet, its direct effects are usually so subtle that its structure remains almost as evasive as in classical physics. Here, in contrast, we report on the disco... |
2003.07281 | Fernando Carneiro | F. L. Carneiro, S. C. Ulhoa, J. F. da Rocha-Neto, J. W. Maluf | On the Quantization of Burgers Vector and Gravitational Energy in the
Space-Time of a Conical Defect | 18 pages, 6 figures | Eur. Phys. J. C 80, 226 (2020) | 10.1140/epjc/s10052-020-7772-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A conical topological defect is the result of translational and/or rotational
deformations of spacetime, in particular the Burgers vector describes the
translational deformation. Such a configuration represents a discontinuity,
that cannot be removed by coordinate transformations, and is related to the
spacetime tors... | [
{
"created": "Mon, 16 Mar 2020 15:33:31 GMT",
"version": "v1"
}
] | 2020-03-18 | [
[
"Carneiro",
"F. L.",
""
],
[
"Ulhoa",
"S. C.",
""
],
[
"da Rocha-Neto",
"J. F.",
""
],
[
"Maluf",
"J. W.",
""
]
] | A conical topological defect is the result of translational and/or rotational deformations of spacetime, in particular the Burgers vector describes the translational deformation. Such a configuration represents a discontinuity, that cannot be removed by coordinate transformations, and is related to the spacetime torsio... |
1512.03302 | Paul Klinger | Paul Klinger | Timelike singularities and Hamiltonian cosmological billiards | 10 pages, 12 figures, journal accepted version | 2016 Class. Quantum Grav. 33 117002 | 10.1088/0264-9381/33/11/117002 | UWThPh-2015-33 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a large class of vacuum solutions of the Einstein equations
without any symmetries and with controlled asymptotics near a timelike
singularity. The solutions are obtained by a Fuchs analysis of the equations
which evolve the metric in a spacelike direction.
We further observe that the changes of signs ... | [
{
"created": "Thu, 10 Dec 2015 16:12:48 GMT",
"version": "v1"
},
{
"created": "Wed, 11 May 2016 13:54:24 GMT",
"version": "v2"
}
] | 2016-05-12 | [
[
"Klinger",
"Paul",
""
]
] | We construct a large class of vacuum solutions of the Einstein equations without any symmetries and with controlled asymptotics near a timelike singularity. The solutions are obtained by a Fuchs analysis of the equations which evolve the metric in a spacelike direction. We further observe that the changes of signs of s... |
2106.01332 | Emanuele Zappala | Niels Gresnigt, Antonino Marciano and Emanuele Zappala | Braided matter interactions in quantum gravity via 1-handle attachment | 15 pages, 7 figures. v4: Improvements on exposition. Final version to
appear in Phys. Rev. D | null | 10.1103/PhysRevD.104.086021 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In a topological description of elementary matter proposed by
Bilson-Thompson, the leptons and quarks of a single generation, together with
the electroweak gauge bosons, are represented as elements of the framed braid
group of three ribbons. By identifying these braids with emergent topological
excitations of ribbon ... | [
{
"created": "Mon, 31 May 2021 05:26:10 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Jun 2021 03:35:02 GMT",
"version": "v2"
},
{
"created": "Mon, 2 Aug 2021 03:31:25 GMT",
"version": "v3"
},
{
"created": "Sat, 11 Sep 2021 04:27:13 GMT",
"version": "v4"
}
] | 2021-10-27 | [
[
"Gresnigt",
"Niels",
""
],
[
"Marciano",
"Antonino",
""
],
[
"Zappala",
"Emanuele",
""
]
] | In a topological description of elementary matter proposed by Bilson-Thompson, the leptons and quarks of a single generation, together with the electroweak gauge bosons, are represented as elements of the framed braid group of three ribbons. By identifying these braids with emergent topological excitations of ribbon ne... |
1512.02539 | Debottam Nandi | Debottam Nandi, S. Shankaranarayanan (IISER-TVM) | Complete Hamiltonian analysis of cosmological perturbations at all
orders | Accepted in JCAP | JCAP 1606 (2016) no.06, 038 | 10.1088/1475-7516/2016/06/038 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we present a consistent Hamiltonian analysis of cosmological
perturbations at all orders. To make the procedure transparent, we consider a
simple model and resolve the `gauge-fixing' issues and extend the analysis to
scalar field models and show that our approach can be applied to any order of
perturbat... | [
{
"created": "Fri, 4 Dec 2015 11:48:27 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Jun 2016 09:01:05 GMT",
"version": "v2"
}
] | 2016-09-28 | [
[
"Nandi",
"Debottam",
"",
"IISER-TVM"
],
[
"Shankaranarayanan",
"S.",
"",
"IISER-TVM"
]
] | In this work, we present a consistent Hamiltonian analysis of cosmological perturbations at all orders. To make the procedure transparent, we consider a simple model and resolve the `gauge-fixing' issues and extend the analysis to scalar field models and show that our approach can be applied to any order of perturbatio... |
gr-qc/0008036 | Haret Rosu | R. Klippert, H.C. Rosu, R. Ruffini | Darboux cosmological fluids in comoving time | 4 pages latex epsfig, 2 figures | null | 10.1142/9789812777386_0470 | null | gr-qc | null | The barotropic indices and the corresponding FRW scale factors of the
so-called Darboux cosmological fluids are presented in the comoving time axis,
which is the natural one for the phenomenology related to the cosmological
data. Some useful comments on the features of the plots are included
| [
{
"created": "Tue, 15 Aug 2000 15:27:29 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Klippert",
"R.",
""
],
[
"Rosu",
"H. C.",
""
],
[
"Ruffini",
"R.",
""
]
] | The barotropic indices and the corresponding FRW scale factors of the so-called Darboux cosmological fluids are presented in the comoving time axis, which is the natural one for the phenomenology related to the cosmological data. Some useful comments on the features of the plots are included |
gr-qc/0106087 | Dr Mayeul Arminjon | Mayeul Arminjon | Comparison between two methods of post-Newtonian expansion for the
motion in a weak Schwarzschild field | PostScript, 12 pages, 3 figures in 2 additional PS files. Accepted
for publication in Nuovo Cimento B. V3: a few typos in V2, plus one sentence
(p.10), corrected. V2: the cure outlined in V1, to remedy a numerical
shortcoming of the asymptotic method, has been implemented. Result: in the
investigated case of a ... | Nuovo Cim.B116:1277-1290,2001 | null | null | gr-qc astro-ph | null | The asymptotic method of post-Newtonian (PN) expansion for weak gravitational
fields, recently developed, is compared with the standard method of PN
expansion, in the particular case of a massive test particle moving along a
geodesic line of a weak Schwarzschild field. First, the expression of the
active mass in Schw... | [
{
"created": "Wed, 27 Jun 2001 15:12:38 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Nov 2001 16:02:13 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Dec 2001 15:38:48 GMT",
"version": "v3"
}
] | 2010-11-11 | [
[
"Arminjon",
"Mayeul",
""
]
] | The asymptotic method of post-Newtonian (PN) expansion for weak gravitational fields, recently developed, is compared with the standard method of PN expansion, in the particular case of a massive test particle moving along a geodesic line of a weak Schwarzschild field. First, the expression of the active mass in Schwar... |
2302.05901 | Muhammad Yarahmadi | Muhammad Yarahmadi, Amin Salehi | Revisiting the history of the evolution of the universe from radiation
dominated to dark energy dominated | vast Changes in content | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Most of our knowledge of the universe has been obtained from the anisotropy
spectrum of the cosmic microwave background and observations of large-scale
structures. During the history of the Universe, neutrinos from the early
Universe evolve from a relativistic phase at very early times to a
massive-particle behavior ... | [
{
"created": "Sun, 12 Feb 2023 12:45:23 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Oct 2023 06:49:33 GMT",
"version": "v2"
}
] | 2023-10-31 | [
[
"Yarahmadi",
"Muhammad",
""
],
[
"Salehi",
"Amin",
""
]
] | Most of our knowledge of the universe has been obtained from the anisotropy spectrum of the cosmic microwave background and observations of large-scale structures. During the history of the Universe, neutrinos from the early Universe evolve from a relativistic phase at very early times to a massive-particle behavior at... |
2201.08727 | Vincent Boudart | Vincent Boudart and Maxime Fays | A machine learning algorithm for minute-long Burst searches | 14 pages, 15 figures | null | 10.1103/PhysRevD.105.083007 | 4126596 | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Minute-long Gravitational Wave (GW) transients are events lasting from few to
hundreds of seconds. In opposition to compact binary mergers, their GW signals
cover a wide range of poorly understood astrophysical phenomena such as
accretion disk instabilities and magnetar flares. The lack of accurate and
rapidly genera... | [
{
"created": "Fri, 21 Jan 2022 14:44:01 GMT",
"version": "v1"
}
] | 2022-04-27 | [
[
"Boudart",
"Vincent",
""
],
[
"Fays",
"Maxime",
""
]
] | Minute-long Gravitational Wave (GW) transients are events lasting from few to hundreds of seconds. In opposition to compact binary mergers, their GW signals cover a wide range of poorly understood astrophysical phenomena such as accretion disk instabilities and magnetar flares. The lack of accurate and rapidly generate... |
1211.4941 | Antonio C. Guti\'errez-Pi\~neres | Antonio C. Guti\'errez-Pi\~neres, Guillermo A. Gonz\'alez and Hernando
Quevedo | Conformastatic disk-haloes in Einstein-Maxwell gravity | To be published in Physical Review D. Replaced with minor changes to
match published version | null | 10.1103/PhysRevD.87.044010 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a relativistic model describing a thin disk surrounded by a halo
in presence of an electromagnetic field. The model is obtained by solving the
Einstein-Maxwell equations on a particular conformastatic spacetime background
and by using the distributional approach for the energy-momentum tensor. A
class of s... | [
{
"created": "Wed, 21 Nov 2012 05:44:52 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Jan 2013 19:09:59 GMT",
"version": "v2"
}
] | 2015-06-12 | [
[
"Gutiérrez-Piñeres",
"Antonio C.",
""
],
[
"González",
"Guillermo A.",
""
],
[
"Quevedo",
"Hernando",
""
]
] | We present a relativistic model describing a thin disk surrounded by a halo in presence of an electromagnetic field. The model is obtained by solving the Einstein-Maxwell equations on a particular conformastatic spacetime background and by using the distributional approach for the energy-momentum tensor. A class of sol... |
2212.03888 | Andrea Maselli | Susanna Barsanti, Andrea Maselli, Thomas P. Sotiriou, Leonardo
Gualtieri | Detecting massive scalar fields with Extreme Mass-Ratio Inspirals | 11 pages, 7 figures | null | 10.1103/PhysRevLett.131.051401 | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the imprint of light scalar fields on gravitational waves from
extreme mass ratio inspirals -- binary systems with a very large mass
asymmetry. We first show that, to leading order in the mass ratio, any effects
of the scalar on the waveform are captured fully by two parameters: the mass of
the scalar and th... | [
{
"created": "Wed, 7 Dec 2022 19:00:02 GMT",
"version": "v1"
}
] | 2023-08-16 | [
[
"Barsanti",
"Susanna",
""
],
[
"Maselli",
"Andrea",
""
],
[
"Sotiriou",
"Thomas P.",
""
],
[
"Gualtieri",
"Leonardo",
""
]
] | We study the imprint of light scalar fields on gravitational waves from extreme mass ratio inspirals -- binary systems with a very large mass asymmetry. We first show that, to leading order in the mass ratio, any effects of the scalar on the waveform are captured fully by two parameters: the mass of the scalar and the ... |
0905.3950 | Sean A. Hayward | Sean A. Hayward | Involute, minimal, outer and increasingly trapped spheres | Substantially extended to include detailed study of static
space-times. 10 REVTeX4 pages | Phys.Rev.D81:024037,2010 | 10.1103/PhysRevD.81.024037 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Seven different refinements of trapped surfaces are proposed, each intended
as potential stability conditions. This article concerns spherical symmetry,
but each condition can be generalized. Involute trapped spheres satisfy a
similar condition to minimal trapped spheres, which are are strictly minimal
with respect t... | [
{
"created": "Mon, 25 May 2009 05:54:21 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Dec 2009 08:28:34 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Hayward",
"Sean A.",
""
]
] | Seven different refinements of trapped surfaces are proposed, each intended as potential stability conditions. This article concerns spherical symmetry, but each condition can be generalized. Involute trapped spheres satisfy a similar condition to minimal trapped spheres, which are are strictly minimal with respect to ... |
1612.08184 | Helvi Witek | Robert Benkel, Thomas P. Sotiriou, Helvi Witek | Dynamical scalar hair formation around a Schwarzschild black hole | 5 pages, 5 figures. v2 updated acknowledgements | Phys. Rev. D 94, 121503(R) (2016) | 10.1103/PhysRevD.94.121503 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scalar fields coupled to the Gauss-Bonnet invariant evade the known no-hair
theorems and have nontrivial configurations around black holes. We focus on a
scalar field that couples linearly to the Gauss-Bonnet invariant and hence
exhibits shift symmetry. We study its dynamical evolution and the formation of
scalar hai... | [
{
"created": "Sat, 24 Dec 2016 14:15:12 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jul 2018 16:14:25 GMT",
"version": "v2"
}
] | 2018-07-19 | [
[
"Benkel",
"Robert",
""
],
[
"Sotiriou",
"Thomas P.",
""
],
[
"Witek",
"Helvi",
""
]
] | Scalar fields coupled to the Gauss-Bonnet invariant evade the known no-hair theorems and have nontrivial configurations around black holes. We focus on a scalar field that couples linearly to the Gauss-Bonnet invariant and hence exhibits shift symmetry. We study its dynamical evolution and the formation of scalar hair ... |
2204.12080 | Ohkyung Kwon | Ohkyung Kwon | Phenomenology of Holography via Quantum Coherence on Causal Horizons | 22 pages, 14 figures | null | null | null | gr-qc quant-ph | http://creativecommons.org/licenses/by/4.0/ | There is much recent development towards interferometric measurements of
holographic quantum uncertainties in an emergent background space-time. Despite
increasing promise for the target detection regime of Planckian strain power
spectral density, the foundational insights of the motivating theories have not
been con... | [
{
"created": "Tue, 26 Apr 2022 05:29:54 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jul 2022 00:26:50 GMT",
"version": "v2"
},
{
"created": "Thu, 2 Nov 2023 09:25:59 GMT",
"version": "v3"
}
] | 2023-11-03 | [
[
"Kwon",
"Ohkyung",
""
]
] | There is much recent development towards interferometric measurements of holographic quantum uncertainties in an emergent background space-time. Despite increasing promise for the target detection regime of Planckian strain power spectral density, the foundational insights of the motivating theories have not been conne... |
0706.2556 | Peter Hogan | C. Barrabes and P. A. Hogan | Inhomogeneous High Frequency Expansion-Free Gravitational Waves | 18 pages, Latex file, accepted for publication in Physical Review D | Phys.Rev.D75:124012,2007 | 10.1103/PhysRevD.75.124012 | null | gr-qc | null | We describe a natural inhomogeneous generalization of high frequency plane
gravitational waves. The waves are high frequency waves of the Kundt type whose
null propagation direction in space-time has vanishing expansion, twist and
shear but is not covariantly constant. The introduction of a cosmological
constant is d... | [
{
"created": "Mon, 18 Jun 2007 09:29:34 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Barrabes",
"C.",
""
],
[
"Hogan",
"P. A.",
""
]
] | We describe a natural inhomogeneous generalization of high frequency plane gravitational waves. The waves are high frequency waves of the Kundt type whose null propagation direction in space-time has vanishing expansion, twist and shear but is not covariantly constant. The introduction of a cosmological constant is dis... |
gr-qc/9704065 | Ignazio Ciufolini | I. Ciufolini, D. Lucchesi, F. Vespe and F. Chieppa | Detection of Lense-Thirring Effect Due to Earth's Spin | 9 pages, Latex version (detection.tex). Only fig. 4 included. This
paper was submitted for publication in Nature in April 1996 and resubmitted
to Nature in March 1997 | null | null | null | gr-qc | null | Rotation of a body, according to Einstein's theory of general relativity,
generates a "force" on other matter; in Newton's gravitational theory only the
mass of a body produces a force. This phenomenon, due to currents of mass, is
known as gravitomagnetism owing to its formal analogies with magnetism due to
currents ... | [
{
"created": "Wed, 23 Apr 1997 18:51:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ciufolini",
"I.",
""
],
[
"Lucchesi",
"D.",
""
],
[
"Vespe",
"F.",
""
],
[
"Chieppa",
"F.",
""
]
] | Rotation of a body, according to Einstein's theory of general relativity, generates a "force" on other matter; in Newton's gravitational theory only the mass of a body produces a force. This phenomenon, due to currents of mass, is known as gravitomagnetism owing to its formal analogies with magnetism due to currents of... |
2003.13078 | Zbigniew Haba | Z.Haba | An inhomogeneous solution of Einstein equations with viscous fluids | 5 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Assuming conformally flat metric we obtain inhomogeneous solutions of
Einstein equations with the energy-momentum of a viscous fluid. We suggest that
the viscous solution can be applied as a model of an expanding inhomogeneous
dark energy.
| [
{
"created": "Sun, 29 Mar 2020 17:04:25 GMT",
"version": "v1"
}
] | 2020-03-31 | [
[
"Haba",
"Z.",
""
]
] | Assuming conformally flat metric we obtain inhomogeneous solutions of Einstein equations with the energy-momentum of a viscous fluid. We suggest that the viscous solution can be applied as a model of an expanding inhomogeneous dark energy. |
0904.1382 | Eugeny Babichev | E. Babichev, D. Langlois | Relativistic stars in f(R) gravity | 5 pages, 4 figures, revtex; v.3: a few corrections with respect to
the published version | Phys.Rev.D80:121501,2009; Erratum-ibid.D81:069901,2010 | 10.1103/PhysRevD.80.121501 10.1103/PhysRevD.81.069901 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the strong gravity regime in viable models of so-called f(R) gravity
that account for the observed cosmic acceleration. In contrast with recent
works suggesting that very relativistic stars might not exist in these models,
we find numerical solutions corresponding to static star configurations with a
strong ... | [
{
"created": "Wed, 8 Apr 2009 17:06:36 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Dec 2009 10:32:00 GMT",
"version": "v2"
},
{
"created": "Thu, 4 Feb 2010 13:28:52 GMT",
"version": "v3"
}
] | 2014-11-18 | [
[
"Babichev",
"E.",
""
],
[
"Langlois",
"D.",
""
]
] | We study the strong gravity regime in viable models of so-called f(R) gravity that account for the observed cosmic acceleration. In contrast with recent works suggesting that very relativistic stars might not exist in these models, we find numerical solutions corresponding to static star configurations with a strong gr... |
gr-qc/9912090 | Sumati Surya | H.F.Dowker, R.S.Garcia and S.Surya | K-causality and degenerate spacetimes | Latex, 23 pages, 4 figures | Class.Quant.Grav. 17 (2000) 4377-4396 | 10.1088/0264-9381/17/21/303 | null | gr-qc | null | The causal relation $K^+$ was introduced by Sorkin and Woolgar to extend the
standard causal analysis of $C^2$ spacetimes to those that are only $C^0$. Most
of their results also hold true in the case of spacetimes with degeneracies. In
this paper we seek to examine $K^+$ explicitly in the case of Lorentzian
topology... | [
{
"created": "Tue, 21 Dec 1999 13:14:46 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Dowker",
"H. F.",
""
],
[
"Garcia",
"R. S.",
""
],
[
"Surya",
"S.",
""
]
] | The causal relation $K^+$ was introduced by Sorkin and Woolgar to extend the standard causal analysis of $C^2$ spacetimes to those that are only $C^0$. Most of their results also hold true in the case of spacetimes with degeneracies. In this paper we seek to examine $K^+$ explicitly in the case of Lorentzian topology c... |
2103.00217 | Ion Vasile Vancea | Adina Crisan, Cresus Godinho and Ion Vancea | Gravitoelectromagnetic knot fields | 22 pages. Published in the Special Issue "Frame-Dragging and
Gravitomagnetism" | Universe 2021, 7, 46 | 10.3390/universe7030046 | null | gr-qc hep-th math-ph math.MP physics.class-ph | http://creativecommons.org/licenses/by/4.0/ | We construct a class of knot solutions of the gravitoelectromagnetic (GEM)
equations in vacuum in the linearized gravity approximation by analogy with the
Ra\~{n}ada-Hopf fields. For these solutions, the dual metric tensors of the
bi-metric geometry of the gravitational vacuum with knot perturbations are
given and th... | [
{
"created": "Sat, 27 Feb 2021 13:44:59 GMT",
"version": "v1"
}
] | 2021-03-02 | [
[
"Crisan",
"Adina",
""
],
[
"Godinho",
"Cresus",
""
],
[
"Vancea",
"Ion",
""
]
] | We construct a class of knot solutions of the gravitoelectromagnetic (GEM) equations in vacuum in the linearized gravity approximation by analogy with the Ra\~{n}ada-Hopf fields. For these solutions, the dual metric tensors of the bi-metric geometry of the gravitational vacuum with knot perturbations are given and the ... |
1102.3539 | Souvik Ghose | S. Ghose and B. C. Paul | On the viability of some Emergent Universe models | 6 pages, 9 figures, prepared in MSWORD, Conf. Proceedings: Exploring
the Cosmos, HECRRC, NBU, Feb, 2011 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A particular class of flat Emergent Universe scenario is studied in light of
recent observational data. Observationally permissible ranges of values are
obtained for the model parameters. The class of model studied here can
accommodate different composition of matter-energy as cosmic fluid. It is found
that recent ob... | [
{
"created": "Thu, 17 Feb 2011 09:48:14 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Sep 2011 07:04:40 GMT",
"version": "v2"
}
] | 2011-09-16 | [
[
"Ghose",
"S.",
""
],
[
"Paul",
"B. C.",
""
]
] | A particular class of flat Emergent Universe scenario is studied in light of recent observational data. Observationally permissible ranges of values are obtained for the model parameters. The class of model studied here can accommodate different composition of matter-energy as cosmic fluid. It is found that recent obse... |
1304.8124 | Jean-Paul Mbelek | Jean Paul Mbelek | Derivation of conditions for a Brans-Dicke coupling constant of order
unity be consistent with solar system bounds | 2 pages, no figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide proofs of some assumptions recently made by F. O. Minotti to
conclude on the possibility that an additional scalar field minimally coupled
to gravity may help to reconcile a Brans-Dicke coupling constant $\omega$ of
the order unity with solar system bounds.
| [
{
"created": "Tue, 30 Apr 2013 19:20:57 GMT",
"version": "v1"
}
] | 2013-05-01 | [
[
"Mbelek",
"Jean Paul",
""
]
] | We provide proofs of some assumptions recently made by F. O. Minotti to conclude on the possibility that an additional scalar field minimally coupled to gravity may help to reconcile a Brans-Dicke coupling constant $\omega$ of the order unity with solar system bounds. |
1205.6166 | Carlos Guedes | Bianca Dittrich, Carlos Guedes, Daniele Oriti | On the space of generalized fluxes for loop quantum gravity | 25 pages, 2 figures; matches published version | Class. Quantum Grav. 30 (2013) 055008 | 10.1088/0264-9381/30/5/055008 | AEI-2012-090 | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the space of generalized fluxes - momentum space - for loop
quantum gravity cannot be constructed by Fourier transforming the projective
limit construction of the space of generalized connections - position space -
due to the non-abelianess of the gauge group SU(2). From the abelianization of
SU(2), U(1)... | [
{
"created": "Mon, 28 May 2012 17:29:02 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Feb 2013 14:47:12 GMT",
"version": "v2"
}
] | 2013-02-12 | [
[
"Dittrich",
"Bianca",
""
],
[
"Guedes",
"Carlos",
""
],
[
"Oriti",
"Daniele",
""
]
] | We show that the space of generalized fluxes - momentum space - for loop quantum gravity cannot be constructed by Fourier transforming the projective limit construction of the space of generalized connections - position space - due to the non-abelianess of the gauge group SU(2). From the abelianization of SU(2), U(1)^3... |
1606.02306 | Shahar Hod | Shahar Hod | The superradiant instability regime of the spinning Kerr black hole | 7 pages | Physics Letters B 758, 181 (2016) | 10.1016/j.physletb.2016.05.012 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spinning Kerr black holes are known to be superradiantly unstable to massive
scalar perturbations. We here prove that the instability regime of the composed
Kerr-black-hole-massive-scalar-field system is bounded from above by the
dimensionless inequality $M\mu < m \cdot \sqrt{{{2(1+\gamma)
(1-\sqrt{1-\gamma^2}) - \ga... | [
{
"created": "Tue, 7 Jun 2016 20:00:06 GMT",
"version": "v1"
}
] | 2016-06-22 | [
[
"Hod",
"Shahar",
""
]
] | Spinning Kerr black holes are known to be superradiantly unstable to massive scalar perturbations. We here prove that the instability regime of the composed Kerr-black-hole-massive-scalar-field system is bounded from above by the dimensionless inequality $M\mu < m \cdot \sqrt{{{2(1+\gamma) (1-\sqrt{1-\gamma^2}) - \gamm... |
gr-qc/9310039 | Thomas Thiemann | T. Thiemann | Generalized boundary conditions for general relativity for the
asymptotically flat case in terms of Ashtekar's variables | Latex, 21 pages, PITHA 93-31, August 1993 | null | null | null | gr-qc | null | There is a gap that has been left open since the formulation of general
relativity in terms of Ashtekar's new variables namely the treatment of
asymptotically flat field configurations that are general enough to be able to
define the generators of the Lorentz subgroup of the asymptotical Poincar\'e
group. While such ... | [
{
"created": "Fri, 29 Oct 1993 09:50:37 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Thiemann",
"T.",
""
]
] | There is a gap that has been left open since the formulation of general relativity in terms of Ashtekar's new variables namely the treatment of asymptotically flat field configurations that are general enough to be able to define the generators of the Lorentz subgroup of the asymptotical Poincar\'e group. While such a ... |
2105.12496 | Bal\'azs Kacskovics | Bal\'azs Kacskovics and Maty\'as Vas\'uth | Examination of orbital evolution and gravitational waves of OJ 287 in
the 4PN order | 16 pages, 8 figure, preprint | null | 10.1088/1361-6382/ac5d17 | CQG-108737.R2 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We computed the orbital evolution and the emitted gravitational radiation of
the supermassive black hole binary OJ 287. Here we used the initial data
provided by the outburst structure of the system. We considered the spin-spin,
spin-orbit, and the next-to-next leading order fourth post-Newtonian (4PN)
corrections in... | [
{
"created": "Wed, 26 May 2021 11:59:12 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Jun 2021 12:44:14 GMT",
"version": "v2"
}
] | 2022-05-05 | [
[
"Kacskovics",
"Balázs",
""
],
[
"Vasúth",
"Matyás",
""
]
] | We computed the orbital evolution and the emitted gravitational radiation of the supermassive black hole binary OJ 287. Here we used the initial data provided by the outburst structure of the system. We considered the spin-spin, spin-orbit, and the next-to-next leading order fourth post-Newtonian (4PN) corrections in o... |
2011.08247 | Nils Siemonsen | Nils Siemonsen and William E. East | Stability of rotating scalar boson stars with nonlinear interactions | 16 pages, 11 figures; revised to match PRD version | Phys. Rev. D 103, 044022 (2021) | 10.1103/PhysRevD.103.044022 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the stability of rotating scalar boson stars, comparing those made
from a simple massive complex scalar (referred to as mini boson stars), to
those with several different types of nonlinear interactions. To that end, we
numerically evolve the nonlinear Einstein-Klein-Gordon equations in 3D,
beginning with st... | [
{
"created": "Mon, 16 Nov 2020 19:56:19 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Feb 2021 19:56:59 GMT",
"version": "v2"
}
] | 2021-02-16 | [
[
"Siemonsen",
"Nils",
""
],
[
"East",
"William E.",
""
]
] | We study the stability of rotating scalar boson stars, comparing those made from a simple massive complex scalar (referred to as mini boson stars), to those with several different types of nonlinear interactions. To that end, we numerically evolve the nonlinear Einstein-Klein-Gordon equations in 3D, beginning with stat... |
2212.13159 | Xiangdong Zhang | You Ding and Xiangdong Zhang | Loop quantum cosmological model from ADM Hamiltonian | 6 pages, 1 figure | Front. Astron. Space Sci. 8:805998 (2022) | 10.3389/fspas.2021.805998 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The loop quantum cosmological model from ADM Hamiltonian is studied in this
paper. We consider the spatially flat homogeneous FRW model. It turns out that
the modified Friedmann equation keeps the same form as the APS LQC model.
However, the critical matter density for the bounce point is only a quarter of
the previo... | [
{
"created": "Mon, 26 Dec 2022 13:43:02 GMT",
"version": "v1"
}
] | 2022-12-27 | [
[
"Ding",
"You",
""
],
[
"Zhang",
"Xiangdong",
""
]
] | The loop quantum cosmological model from ADM Hamiltonian is studied in this paper. We consider the spatially flat homogeneous FRW model. It turns out that the modified Friedmann equation keeps the same form as the APS LQC model. However, the critical matter density for the bounce point is only a quarter of the previous... |
2006.12954 | Victor Danchev Mr. | Victor I. Danchev, Daniela D. Doneva and Stoytcho S. Yazadjiev | Slowly rotating topological neutron stars -- universal relations and
epicyclic frequencies | 12 pages, 14 figures | null | 10.1140/epjc/s10052-020-08473-y | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the modern era of abundant X-ray detections and the increasing momentum of
gravitational waves astronomy, tests of General Relativity in strong field
regime become increasingly feasible and their importance for probing gravity
cannot be understated. To this end, we study the characteristics of slowly
rotating topo... | [
{
"created": "Tue, 23 Jun 2020 12:49:42 GMT",
"version": "v1"
}
] | 2020-09-25 | [
[
"Danchev",
"Victor I.",
""
],
[
"Doneva",
"Daniela D.",
""
],
[
"Yazadjiev",
"Stoytcho S.",
""
]
] | In the modern era of abundant X-ray detections and the increasing momentum of gravitational waves astronomy, tests of General Relativity in strong field regime become increasingly feasible and their importance for probing gravity cannot be understated. To this end, we study the characteristics of slowly rotating topolo... |
gr-qc/0504099 | Kourosh Nozari | Kourosh Nozari and S. Hamid Mehdipour | On the Quantum-Corrected Black Hole Thermodynamics | 9 pages, no figures, Overall Revision | Electron.J.Theor.Phys. 3N11 (2006) 151-158 | null | null | gr-qc | null | Bekenstein-Hawking Black hole thermodynamics should be corrected to
incorporate quantum gravitational effects. Generalized Uncertainty
Principle(GUP) provides a perturbational framework to perform such
modifications. In this paper we consider the most general form of GUP to find
black holes thermodynamics in microcan... | [
{
"created": "Thu, 21 Apr 2005 06:30:52 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Jan 2006 15:55:48 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Nozari",
"Kourosh",
""
],
[
"Mehdipour",
"S. Hamid",
""
]
] | Bekenstein-Hawking Black hole thermodynamics should be corrected to incorporate quantum gravitational effects. Generalized Uncertainty Principle(GUP) provides a perturbational framework to perform such modifications. In this paper we consider the most general form of GUP to find black holes thermodynamics in microcanon... |
gr-qc/0511041 | Daniel Soler | D. Soler | Reference frames and rigid motions in relativity: Applications | 13 pages, 1 figure | Found.Phys.36:1718-1735,2006 | 10.1007/s10701-006-9080-x | null | gr-qc | null | The concept of rigid reference frame and of constricted spatial metric, given
in the previous work [\emph{Class. Quantum Grav.} {\bf 21}, 3067,(2004)] are
here applied to some specific space-times: In particular, the rigid rotating
disc with constant angular velocity in Minkowski space-time is analyzed, a new
approac... | [
{
"created": "Tue, 8 Nov 2005 16:24:12 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Dec 2005 09:52:23 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Soler",
"D.",
""
]
] | The concept of rigid reference frame and of constricted spatial metric, given in the previous work [\emph{Class. Quantum Grav.} {\bf 21}, 3067,(2004)] are here applied to some specific space-times: In particular, the rigid rotating disc with constant angular velocity in Minkowski space-time is analyzed, a new approach ... |
2402.18462 | Pardyumn Kumar Sahoo | Simran Arora, P.H.R.S. Moraes, P.K. Sahoo | Energy conditions in the $f(R,L,T)$ theory of gravity | EPJ Plus accepted version | European Physical Journal Plus, 139(6) (2024) 542 | 10.1140/epjp/s13360-024-05346-1 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We construct the energy conditions for the recently proposed $f(R,L,T)$
gravity theory, for which $f$ is a generic function of the Ricci scalar $R$,
matter lagrangian density $L$ and trace of the energy-momentum tensor $T$. We
analyse two different forms for the $f(R,L,T)$ function within the framework of
the Friedma... | [
{
"created": "Wed, 28 Feb 2024 16:38:40 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jun 2024 04:01:36 GMT",
"version": "v2"
}
] | 2024-06-25 | [
[
"Arora",
"Simran",
""
],
[
"Moraes",
"P. H. R. S.",
""
],
[
"Sahoo",
"P. K.",
""
]
] | We construct the energy conditions for the recently proposed $f(R,L,T)$ gravity theory, for which $f$ is a generic function of the Ricci scalar $R$, matter lagrangian density $L$ and trace of the energy-momentum tensor $T$. We analyse two different forms for the $f(R,L,T)$ function within the framework of the Friedmann... |
2305.01048 | S Habib Mazharimousavi | S. Habib Mazharimousavi | Quark-antiquark confinement and nonlinear electrodynamics | 10 pages, 2 figures. Accepted for publication in Phys. Lett. B (in
press) | Physics Letters B Volume 841, 10 June 2023, 137948 | 10.1016/j.physletb.2023.137948 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cornell potential is known to represent the quark-antiquark confinement
interaction. In addition to the Cornell potential, there have been other
interactions in the literature that demonstrate confining structure in the
quark-antiquark system. Guendelman has proposed a nonlinear electrodynamics
(NED) model which resu... | [
{
"created": "Mon, 1 May 2023 19:26:30 GMT",
"version": "v1"
}
] | 2023-05-26 | [
[
"Mazharimousavi",
"S. Habib",
""
]
] | Cornell potential is known to represent the quark-antiquark confinement interaction. In addition to the Cornell potential, there have been other interactions in the literature that demonstrate confining structure in the quark-antiquark system. Guendelman has proposed a nonlinear electrodynamics (NED) model which result... |
1607.05787 | Nicolas Yunes | Nicolas Yunes | Musings on Lorentz Violation Given the Recent Gravitational-Wave
Observations of Coalescing Binary Black Holes | Presented at the Seventh Meeting on CPT and Lorentz Symmetry,
Bloomington, Indiana, June 20-24, 2016 | null | null | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent observation of gravitational waves by the LIGO/Virgo collaboration
provides a unique opportunity to probe the extreme gravity of coalescing binary
black holes. In this regime, the gravitational interaction is not only strong,
but the spacetime curvature is large, characteristic velocities are a
non-negligi... | [
{
"created": "Wed, 20 Jul 2016 00:34:41 GMT",
"version": "v1"
}
] | 2016-07-21 | [
[
"Yunes",
"Nicolas",
""
]
] | The recent observation of gravitational waves by the LIGO/Virgo collaboration provides a unique opportunity to probe the extreme gravity of coalescing binary black holes. In this regime, the gravitational interaction is not only strong, but the spacetime curvature is large, characteristic velocities are a non-negligibl... |
1201.4989 | Jan Steinhoff | T\'erence Delsate and Jan Steinhoff | New insights on the matter-gravity coupling paradigm | 6 pages, 2 figures, v2: revised version, v3: published version | Phys.Rev.Lett.109:021101,2012 | 10.1103/PhysRevLett.109.021101 | null | gr-qc astro-ph.SR hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The coupling between matter and gravity in General Relativity is given by a
proportionality relation between the stress tensor and the geometry. This is an
oriented assumption driven by the fact that both the stress tensor and the
Einstein tensor are divergenceless. However, General Relativity is in essence a
nonline... | [
{
"created": "Tue, 24 Jan 2012 14:39:35 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Jun 2012 01:35:42 GMT",
"version": "v2"
},
{
"created": "Fri, 31 Aug 2012 20:53:50 GMT",
"version": "v3"
}
] | 2012-09-04 | [
[
"Delsate",
"Térence",
""
],
[
"Steinhoff",
"Jan",
""
]
] | The coupling between matter and gravity in General Relativity is given by a proportionality relation between the stress tensor and the geometry. This is an oriented assumption driven by the fact that both the stress tensor and the Einstein tensor are divergenceless. However, General Relativity is in essence a nonlinear... |
1805.06442 | Daniel Wysocki | Daniel Wysocki (1), Jacob Lange (1), Richard O'Shaughnessy (1) ((1)
Rochester Institute of Technology) | Reconstructing phenomenological distributions of compact binaries via
gravitational wave observations | Published in PRD | Phys. Rev. D 100, 043012 (2019) | 10.1103/PhysRevD.100.043012 | LIGO P1800107 | gr-qc astro-ph.HE astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational wave measurements will provide insight into the population of
coalescing compact binaries throughout the universe. We describe and
demonstrate a flexible parametric method to infer the event rate as a function
of compact binary parameters, accounting for Poisson error and selection
biases. Using concret... | [
{
"created": "Wed, 16 May 2018 17:47:34 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Apr 2019 19:08:11 GMT",
"version": "v2"
},
{
"created": "Fri, 16 Aug 2019 21:56:09 GMT",
"version": "v3"
}
] | 2019-08-20 | [
[
"Wysocki",
"Daniel",
""
],
[
"Lange",
"Jacob",
""
],
[
"O'Shaughnessy",
"Richard",
""
]
] | Gravitational wave measurements will provide insight into the population of coalescing compact binaries throughout the universe. We describe and demonstrate a flexible parametric method to infer the event rate as a function of compact binary parameters, accounting for Poisson error and selection biases. Using concrete ... |
1211.2765 | Andres Anabalon | Andres Anabalon | Exact Hairy Black Holes | Some typos corrected.8 pp. Contribution to the Proceedings of
Relativity and Gravitation: 100 years after Einstein in Prague, Prague, 25-29
June, 2012 | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This proceeding reviews the recent finding of a certain class of, regular on
and outside the horizon, exact hairy black hole solutions in four dimensional
general relativity. Their construction follow from the integrability of a
cohomogeneity two Weyl rescaling of the Carter-Debever ansatz in the presence
of an arbit... | [
{
"created": "Mon, 12 Nov 2012 20:03:34 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Nov 2012 17:38:53 GMT",
"version": "v2"
}
] | 2012-11-14 | [
[
"Anabalon",
"Andres",
""
]
] | This proceeding reviews the recent finding of a certain class of, regular on and outside the horizon, exact hairy black hole solutions in four dimensional general relativity. Their construction follow from the integrability of a cohomogeneity two Weyl rescaling of the Carter-Debever ansatz in the presence of an arbitra... |
2404.01742 | Tiago Gon\c{c}alves | Tiago B. Gon\c{c}alves, Lu\'is Atayde, and Noemi Frusciante | Cosmological study of a symmetric teleparallel gravity model | 24 pages, 14 figures | Phys. Rev. D 109, 084003 (2024) | 10.1103/PhysRevD.109.084003 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a symmetric teleparallel gravity with a Lagrangian of logarithmic
form. The full model leads to an accelerated universe and for specific values
of the free parameters the Hubble rate reduces to the well-known
Dvali-Gabadadze-Porrati model, though the evolution of the gravitational
potentials are different. W... | [
{
"created": "Tue, 2 Apr 2024 09:00:50 GMT",
"version": "v1"
}
] | 2024-04-04 | [
[
"Gonçalves",
"Tiago B.",
""
],
[
"Atayde",
"Luís",
""
],
[
"Frusciante",
"Noemi",
""
]
] | We study a symmetric teleparallel gravity with a Lagrangian of logarithmic form. The full model leads to an accelerated universe and for specific values of the free parameters the Hubble rate reduces to the well-known Dvali-Gabadadze-Porrati model, though the evolution of the gravitational potentials are different. We ... |
1404.6114 | Yong-Chang Huang | Yong-Chang Huang and LiuJi Li | Variable Extra Dimensional Spacetime and Solution to Initial Singularity
Paradox of Our Universe From Extra Dimensions | 6 pages, 1 figure | null | null | ITP No.02 BJUT | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Considering a n-dimensional general spacetime, we deduce its 4-dimensional
Einstein equation and Friedman equations, and discover a general dual relation
between the scale factor $a(t)$ of our universe and the scale factor $B(t)$ of
extra dimensions. Based on the dual relation equation, predictions of shrinking
of ex... | [
{
"created": "Thu, 24 Apr 2014 13:21:11 GMT",
"version": "v1"
},
{
"created": "Sat, 26 Apr 2014 11:20:43 GMT",
"version": "v2"
},
{
"created": "Thu, 12 Jun 2014 14:05:07 GMT",
"version": "v3"
},
{
"created": "Thu, 30 Oct 2014 15:47:27 GMT",
"version": "v4"
},
{
"c... | 2015-01-20 | [
[
"Huang",
"Yong-Chang",
""
],
[
"Li",
"LiuJi",
""
]
] | Considering a n-dimensional general spacetime, we deduce its 4-dimensional Einstein equation and Friedman equations, and discover a general dual relation between the scale factor $a(t)$ of our universe and the scale factor $B(t)$ of extra dimensions. Based on the dual relation equation, predictions of shrinking of extr... |
1808.08577 | Elena V. Arbuzova | E.V. Arbuzova | Spontaneous and Gravitational Baryogenesis | 10 pages. Invited talk presented at the Conference on Particles and
Cosmology, 5 to 9 March 2018, NTU, Singapore | null | 10.1142/S0217751X18440232 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Some problems of spontaneous and gravitational baryogenesis are discussed.
Gravity modification due to the curvature dependent term in gravitational
baryogensis scenario is considered. It is shown that the interaction of
baryonic fields with the curvature scalar leads to strong instability of the
gravitational equati... | [
{
"created": "Sun, 26 Aug 2018 15:36:39 GMT",
"version": "v1"
}
] | 2018-12-05 | [
[
"Arbuzova",
"E. V.",
""
]
] | Some problems of spontaneous and gravitational baryogenesis are discussed. Gravity modification due to the curvature dependent term in gravitational baryogensis scenario is considered. It is shown that the interaction of baryonic fields with the curvature scalar leads to strong instability of the gravitational equation... |
1601.05712 | Diego S\'aez | Neus Puchades and Diego S\'aez | Approaches to relativistic positioning around Earth and error
estimations | 24 pages, 5 figures, published in Advances in Space Research | Advances in Space Research 57 (2016) 499 | 10.1016/j.asr.2015.10.031 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of relativistic positioning, the coordinates of a given user
may be calculated by using suitable information broadcast by a 4-tuple of
satellites. Our 4-tuples belong to the Galileo constellation. Recently, we
estimated the positioning errors due to uncertainties in the satellite world
lines (U-errors)... | [
{
"created": "Thu, 21 Jan 2016 17:08:29 GMT",
"version": "v1"
}
] | 2016-01-22 | [
[
"Puchades",
"Neus",
""
],
[
"Sáez",
"Diego",
""
]
] | In the context of relativistic positioning, the coordinates of a given user may be calculated by using suitable information broadcast by a 4-tuple of satellites. Our 4-tuples belong to the Galileo constellation. Recently, we estimated the positioning errors due to uncertainties in the satellite world lines (U-errors). ... |
gr-qc/0507099 | Masaru Shibata | Masaru Shibata and Jos\'e A. Font | Robustness of a high-resolution central scheme for hydrodynamic
simulations in full general relativity | 4 pages, to be published in Phys. Rev. D (brief report) | Phys.Rev. D72 (2005) 047501 | 10.1103/PhysRevD.72.047501 | null | gr-qc astro-ph | null | A recent paper by Lucas-Serrano et al. indicates that a high-resolution
central (HRC) scheme is robust enough to yield accurate hydrodynamical
simulations of special relativistic flows in the presence of ultrarelativistic
speeds and strong shock waves. In this paper we apply this scheme in full
general relativity (in... | [
{
"created": "Sun, 24 Jul 2005 08:52:12 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Shibata",
"Masaru",
""
],
[
"Font",
"José A.",
""
]
] | A recent paper by Lucas-Serrano et al. indicates that a high-resolution central (HRC) scheme is robust enough to yield accurate hydrodynamical simulations of special relativistic flows in the presence of ultrarelativistic speeds and strong shock waves. In this paper we apply this scheme in full general relativity (invo... |
gr-qc/0006103 | Jose Luis Jaramillo | V. Aldaya, J.L. Jaramillo | A first analysis regarding matter-dynamical diffeomorphism coupling | 20 pages, latex, no figures | Class.Quant.Grav. 17 (2000) 4877-4894 | 10.1088/0264-9381/17/23/307 | null | gr-qc | null | A first attempt at adding matter degrees of freedom to the two-dimensional
``vacuum'' gravity model presented in gr-qc/9907071 is analyzed in this paper.
Just as in the previous pure gravity case, quantum diffeomorphism operators
(constructed from a Virasoro algebra) possess a dynamical content; their gauge
nature is... | [
{
"created": "Thu, 29 Jun 2000 09:12:44 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Aldaya",
"V.",
""
],
[
"Jaramillo",
"J. L.",
""
]
] | A first attempt at adding matter degrees of freedom to the two-dimensional ``vacuum'' gravity model presented in gr-qc/9907071 is analyzed in this paper. Just as in the previous pure gravity case, quantum diffeomorphism operators (constructed from a Virasoro algebra) possess a dynamical content; their gauge nature is r... |
gr-qc/0307033 | H. Kleinert | H Kleinert and J. Zaanen | World Nematic Crystal Model of Gravity Explaining the Absence of Torsion | 4 pages, no figures. Author Information under
http://www.physik.fu-berlin.de/~kleinert/institution.html . Latest update of
paper (including all PS fonts) at
http://www.physik.fu-berlin.de/~kleinert/346 | Phys.Lett.A324:361-365,2004 | 10.1016/j.physleta.2004.03.048 | null | gr-qc | null | We attribute the gravitational interaction between sources of curvature to
the world being a crystal which has undergone a quantum phase transition to a
nematic phase by a condensation of dislocations.
The model explains why spacetime has no observable torsion and predicts the
existence of curvature sources in the ... | [
{
"created": "Wed, 9 Jul 2003 05:23:25 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Kleinert",
"H",
""
],
[
"Zaanen",
"J.",
""
]
] | We attribute the gravitational interaction between sources of curvature to the world being a crystal which has undergone a quantum phase transition to a nematic phase by a condensation of dislocations. The model explains why spacetime has no observable torsion and predicts the existence of curvature sources in the form... |
gr-qc/0607015 | Yoshiaki Himemoto | Yoshiaki Himemoto, Atsushi Taruya, Hideaki Kudoh, Takashi Hiramatsu | Detecting a stochastic background of gravitational waves in the presence
of non-Gaussian noise: A performance of generalized cross-correlation
statistic | 15 pages, 8 figures, presentation and some figures modified, final
version to be published in PRD | Phys.Rev.D75:022003,2007 | 10.1103/PhysRevD.75.022003 | null | gr-qc astro-ph | null | We discuss a robust data analysis method to detect a stochastic background of
gravitational waves in the presence of non-Gaussian noise. In contrast to the
standard cross-correlation (SCC) statistic frequently used in the stochastic
background searches, we consider a {\it generalized cross-correlation} (GCC)
statisti... | [
{
"created": "Wed, 5 Jul 2006 06:13:54 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Jan 2007 01:17:09 GMT",
"version": "v2"
},
{
"created": "Wed, 24 Jan 2007 03:23:03 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Himemoto",
"Yoshiaki",
""
],
[
"Taruya",
"Atsushi",
""
],
[
"Kudoh",
"Hideaki",
""
],
[
"Hiramatsu",
"Takashi",
""
]
] | We discuss a robust data analysis method to detect a stochastic background of gravitational waves in the presence of non-Gaussian noise. In contrast to the standard cross-correlation (SCC) statistic frequently used in the stochastic background searches, we consider a {\it generalized cross-correlation} (GCC) statistic,... |
gr-qc/0207116 | Massimo Giovannini | Massimo Giovannini (Institute of Theoretical Physics, University of
Lausanne) | Scalar normal modes of higher dimensional gravitating kinks | 20 pages in Latex style | Class.Quant.Grav. 20 (2003) 1063-1076 | 10.1088/0264-9381/20/6/303 | UNIL-IPT-02-08 | gr-qc | null | The scalar normal modes of higher dimensional gravitating kink solutions are
derived. By perturbing to second order the gravity and matter parts of the
action in the background of a five-dimensional kink, the effective Lagrangian
of the scalar fluctuations is derived and diagonalized in terms of a single
degree of fr... | [
{
"created": "Mon, 29 Jul 2002 17:40:12 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Giovannini",
"Massimo",
"",
"Institute of Theoretical Physics, University of\n Lausanne"
]
] | The scalar normal modes of higher dimensional gravitating kink solutions are derived. By perturbing to second order the gravity and matter parts of the action in the background of a five-dimensional kink, the effective Lagrangian of the scalar fluctuations is derived and diagonalized in terms of a single degree of free... |
1903.07455 | Ritabrata Biswas | Amritendu Haldar and Ritabrata Biswas | Thermodynamic Variables of First-Order Entropy Corrected Lovelock-AdS
Black Holes : P-V Criticality Analysis | 12 figures | General Relativity and Gravitation 50 (2018)69 | 10.1007/s10714-018-2392-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the effect of thermal fluctuations on the thermodynamics of a
Lovelock-AdS black hole. Taking the first order logarithmic correction term in
entropy we analyze the thermodynamic potentials like Helmholtz free energy,
enthalpy and Gibbs free energy. We find that all the thermodynamic potentials
are decr... | [
{
"created": "Fri, 15 Mar 2019 02:28:31 GMT",
"version": "v1"
}
] | 2019-03-19 | [
[
"Haldar",
"Amritendu",
""
],
[
"Biswas",
"Ritabrata",
""
]
] | We investigate the effect of thermal fluctuations on the thermodynamics of a Lovelock-AdS black hole. Taking the first order logarithmic correction term in entropy we analyze the thermodynamic potentials like Helmholtz free energy, enthalpy and Gibbs free energy. We find that all the thermodynamic potentials are decrea... |
2301.08118 | Maxim Makukov | Maxim Makukov, Eduard Mychelkin | Rotation in vacuum and scalar background: are there alternatives to
Newman-Janis algorithm? | Accepted in IJMPD | null | 10.1142/S0218271823500232 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Newman-Janis algorithm is the standard approach to rotation in general
relativity which, in vacuum, builds the Kerr metric from the Schwarzschild
spacetime. Recently, we have shown that the same algorithm applied to the
Papapetrou antiscalar spacetime produces a rotational metric devoid of horizons
and ergosphere... | [
{
"created": "Thu, 19 Jan 2023 15:18:55 GMT",
"version": "v1"
}
] | 2023-05-03 | [
[
"Makukov",
"Maxim",
""
],
[
"Mychelkin",
"Eduard",
""
]
] | The Newman-Janis algorithm is the standard approach to rotation in general relativity which, in vacuum, builds the Kerr metric from the Schwarzschild spacetime. Recently, we have shown that the same algorithm applied to the Papapetrou antiscalar spacetime produces a rotational metric devoid of horizons and ergospheres.... |
2105.06789 | Behnam Pourhassan | M. Hameeda, B. Pourhassan, M.C.Rocca, Aram Bahroz Brzo | Two approaches that prove divergence free nature of non-local gravity | See published version in EPJC | Eur. Phys. J. C 81 (2021) 146 | 10.1140/epjc/s10052-021-08940-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is an attempt to study the thermodynamics of the structure
formation in the large scale universe in the non local gravity using Boltzmann
statistics and the Tsallis statistics. The partition function is obtained in
both the approaches and the corresponding thermodynamics properties are
evaluated. The impor... | [
{
"created": "Wed, 12 May 2021 18:54:59 GMT",
"version": "v1"
}
] | 2021-05-17 | [
[
"Hameeda",
"M.",
""
],
[
"Pourhassan",
"B.",
""
],
[
"Rocca",
"M. C.",
""
],
[
"Brzo",
"Aram Bahroz",
""
]
] | This paper is an attempt to study the thermodynamics of the structure formation in the large scale universe in the non local gravity using Boltzmann statistics and the Tsallis statistics. The partition function is obtained in both the approaches and the corresponding thermodynamics properties are evaluated. The importa... |
gr-qc/0204046 | Maria da Conceicao Bento | M.C. Bento, O. Bertolami and A.A. Sen | Supergravity Inflation on the Brane | 6 pages, 1 figure, to appear in Phys. Rev. D | Phys.Rev. D67 (2003) 023504 | 10.1103/PhysRevD.67.023504 | null | gr-qc astro-ph hep-ph | null | We study N=1 Supergravity inflation in the context of the braneworld
scenario. Particular attention is paid to the problem of the onset of inflation
at sub-Planckian field values and the ensued inflationary observables. We find
that the so-called $\eta$-problem encountered in supergravity inspired
inflationary models... | [
{
"created": "Fri, 12 Apr 2002 17:49:38 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Nov 2002 15:23:05 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Bento",
"M. C.",
""
],
[
"Bertolami",
"O.",
""
],
[
"Sen",
"A. A.",
""
]
] | We study N=1 Supergravity inflation in the context of the braneworld scenario. Particular attention is paid to the problem of the onset of inflation at sub-Planckian field values and the ensued inflationary observables. We find that the so-called $\eta$-problem encountered in supergravity inspired inflationary models c... |
gr-qc/9706081 | null | S.Ansoldi, A.Aurilia, R.Balbinot, E.Spallucci | Classical and Quantum Shell Dynamics, and Vacuum Decay | 36 pages, ReVTeX, 10 Figs. in postscript format, in print on Class.&
Quant.Grav | Class.Quant.Grav. 14 (1997) 2727-2755 | 10.1088/0264-9381/14/10/004 | null | gr-qc hep-th | null | Following a minisuperspace approach to the dynamics of a spherically
symmetric shell, a reduced Lagrangian for the radial degree of freedom is
derived directly from the Einstein-Hilbert action. The key feature of this new
Lagrangian is its invariance under time reparametrization. Indeed, all
classical and quantum dyn... | [
{
"created": "Fri, 27 Jun 1997 11:02:23 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Ansoldi",
"S.",
""
],
[
"Aurilia",
"A.",
""
],
[
"Balbinot",
"R.",
""
],
[
"Spallucci",
"E.",
""
]
] | Following a minisuperspace approach to the dynamics of a spherically symmetric shell, a reduced Lagrangian for the radial degree of freedom is derived directly from the Einstein-Hilbert action. The key feature of this new Lagrangian is its invariance under time reparametrization. Indeed, all classical and quantum dynam... |
gr-qc/9908039 | Andrei V. Frolov | Andrei V. Frolov and Arne L. Larsen | Chaotic Scattering and Capture of Strings by Black Hole | RevTeX 3.1, 9 pages, 5 figures | Class.Quant.Grav. 16 (1999) 3717-3724 | 10.1088/0264-9381/16/11/316 | null | gr-qc hep-th | null | We consider scattering and capture of circular cosmic strings by a
Schwarzschild black hole. Although being a priori a very simple axially
symmetric two-body problem, it shows all the features of chaotic scattering. In
particular, it contains a fractal set of unstable periodic solutions; a
so-called strange repellor.... | [
{
"created": "Wed, 11 Aug 1999 21:40:02 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Sep 1999 22:19:02 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Frolov",
"Andrei V.",
""
],
[
"Larsen",
"Arne L.",
""
]
] | We consider scattering and capture of circular cosmic strings by a Schwarzschild black hole. Although being a priori a very simple axially symmetric two-body problem, it shows all the features of chaotic scattering. In particular, it contains a fractal set of unstable periodic solutions; a so-called strange repellor. W... |
2204.03314 | Oleg Zaslavskii | O. B. Zaslavskii | Decay of charged particles near naked singularities and super-Penrose
process without fine-tuning | 15 pages. Presentation expanded and improved, title somewhat changed.
To appear in PRD | Phys. Rev. D 105 (2022) 124043 | 10.1103/PhysRevD.105.124043 | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider the Penrose process near the naked singularity in the
Reissner-Nordstr\"{o}m metric. Particle 0 falls from infinity and decays to two
fragments at some point $r_{0}$. We show that the energy extraction due to this
process can be indefinitely large in the limit $r_{0}\rightarrow 0$. In doing
so, the value ... | [
{
"created": "Thu, 7 Apr 2022 09:24:40 GMT",
"version": "v1"
},
{
"created": "Sat, 18 Jun 2022 18:12:00 GMT",
"version": "v2"
}
] | 2022-07-13 | [
[
"Zaslavskii",
"O. B.",
""
]
] | We consider the Penrose process near the naked singularity in the Reissner-Nordstr\"{o}m metric. Particle 0 falls from infinity and decays to two fragments at some point $r_{0}$. We show that the energy extraction due to this process can be indefinitely large in the limit $r_{0}\rightarrow 0$. In doing so, the value of... |
1204.6033 | Anatoliy Prykarpatsky | N.N. Bogolubov (Jr.) and A.K. Prykarpatsky | Modern Classical Electrodynamics and Electromagnetic Radiation - Vacuum
Field Theory Aspects | 32 pages. arXiv admin note: substantial text overlap with
arXiv:0909.4852 and 0810.3303 | null | null | "Electromagnetiv waves", Edited by V. Zhurbenko, INTECH Publisger,
2011 | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The work is devoted to studying some new classical electrodynamics models of
interacting charged point particles and related with them physical aspects.
Based on the vacuum field theory no-geometry approach, developed in
\cite{BPT,BPT1}, the Lagrangian and Hamiltonian reformulations of some
alternative classical elec... | [
{
"created": "Wed, 25 Apr 2012 20:09:31 GMT",
"version": "v1"
},
{
"created": "Sat, 16 Feb 2013 16:26:58 GMT",
"version": "v2"
}
] | 2013-02-19 | [
[
"Bogolubov",
"N. N.",
"",
"Jr."
],
[
"Prykarpatsky",
"A. K.",
""
]
] | The work is devoted to studying some new classical electrodynamics models of interacting charged point particles and related with them physical aspects. Based on the vacuum field theory no-geometry approach, developed in \cite{BPT,BPT1}, the Lagrangian and Hamiltonian reformulations of some alternative classical electr... |
2112.13938 | Matthew J. Lake Dr | Matthew J. Lake | Generalised Uncertainty Relations and the Problem of Dark Energy | 6 pages, no figures. Published version. Contribution to the
proceedings of the Viewpoints in Astronomy, Astrophysics, Space and Planetary
Sciences conference, Cluj-Napoca, Romania, October 2021 | Romanian Astron. J., Vol 32, No. 1, p. 3-14, Bucharest, 2022 | null | null | gr-qc hep-ph quant-ph | http://creativecommons.org/licenses/by/4.0/ | We outline a new model in which generalised uncertainty relations, that
govern the behaviour of microscopic world, and dark energy, that determines the
large-scale evolution of the Universe, are intrinsically linked via the quantum
properties of space-time. In this approach the background is treated as a
genuinely qu... | [
{
"created": "Mon, 27 Dec 2021 23:36:16 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Jul 2022 02:06:57 GMT",
"version": "v2"
}
] | 2022-07-06 | [
[
"Lake",
"Matthew J.",
""
]
] | We outline a new model in which generalised uncertainty relations, that govern the behaviour of microscopic world, and dark energy, that determines the large-scale evolution of the Universe, are intrinsically linked via the quantum properties of space-time. In this approach the background is treated as a genuinely quan... |
gr-qc/0411141 | Thomas Thiemann | Bianca Dittrich and Thomas Thiemann | Testing the Master Constraint Programme for Loop Quantum Gravity IV.
Free Field Theories | 23 pages, no figures | Class.Quant.Grav. 23 (2006) 1121-1142 | 10.1088/0264-9381/23/4/004 | AEI-2004-119 | gr-qc hep-th math-ph math.MP | null | This is the fourth paper in our series of five in which we test the Master
Constraint Programme for solving the Hamiltonian constraint in Loop Quantum
Gravity. We now move on to free field theories with constraints, namely Maxwell
theory and linearized gravity. Since the Master constraint involves squares of
constrai... | [
{
"created": "Mon, 29 Nov 2004 19:12:01 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Dittrich",
"Bianca",
""
],
[
"Thiemann",
"Thomas",
""
]
] | This is the fourth paper in our series of five in which we test the Master Constraint Programme for solving the Hamiltonian constraint in Loop Quantum Gravity. We now move on to free field theories with constraints, namely Maxwell theory and linearized gravity. Since the Master constraint involves squares of constraint... |
gr-qc/0105112 | Sanjeev S. Seahra | Takao Fukui, Sanjeev S. Seahra and Paul S. Wesson | Cosmological Implications of a Non-Separable 5D Solution of the Vacuum
Einstein Field Equations | 8 pages, in press in J. Math. Phys | J.Math.Phys. 42 (2001) 5195-5201 | 10.1063/1.1407836 | null | gr-qc | null | An exact class of solutions of the 5D vacuum Einstein field equations (EFEs)
is obtained. The metric coefficients are found to be non-separable functions of
time and the extra coordinate $l$ and the induced metric on $l$ = constant
hypersurfaces has the form of a Friedmann-Robertson-Walker cosmology. The 5D
manifold ... | [
{
"created": "Tue, 29 May 2001 18:44:55 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Fukui",
"Takao",
""
],
[
"Seahra",
"Sanjeev S.",
""
],
[
"Wesson",
"Paul S.",
""
]
] | An exact class of solutions of the 5D vacuum Einstein field equations (EFEs) is obtained. The metric coefficients are found to be non-separable functions of time and the extra coordinate $l$ and the induced metric on $l$ = constant hypersurfaces has the form of a Friedmann-Robertson-Walker cosmology. The 5D manifold an... |
2011.10620 | P. A. Gonzalez | R. D. B. Fontana, P. A. Gonz\'alez, Eleftherios Papantonopoulos, Yerko
V\'asquez | Anomalous decay rate of quasinormal modes in Reissner-Nordstr\"om black
holes | Version accepted for publication in PRD | Phys. Rev. D 103, 064005 (2021) | 10.1103/PhysRevD.103.064005 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The anomalous decay rate of the quasinormal modes occurs when the
longest-lived modes are the ones with higher angular number. Such behaviour has
been recently studied in different static spacetimes, for scalar and fermionic
perturbations, being observed in both cases. In this work, we extend the
existent studies to ... | [
{
"created": "Fri, 20 Nov 2020 20:24:16 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Dec 2020 13:03:10 GMT",
"version": "v2"
},
{
"created": "Wed, 3 Feb 2021 13:23:15 GMT",
"version": "v3"
}
] | 2021-03-10 | [
[
"Fontana",
"R. D. B.",
""
],
[
"González",
"P. A.",
""
],
[
"Papantonopoulos",
"Eleftherios",
""
],
[
"Vásquez",
"Yerko",
""
]
] | The anomalous decay rate of the quasinormal modes occurs when the longest-lived modes are the ones with higher angular number. Such behaviour has been recently studied in different static spacetimes, for scalar and fermionic perturbations, being observed in both cases. In this work, we extend the existent studies to th... |
1504.07927 | David Polarski | B. Boisseau, H. Giacomini, D. Polarski, A. A. Starobinsky | Bouncing Universes in Scalar-Tensor Gravity Models admitting Negative
Potentials | 12 pages, Improved presentation with 4 figures, Results and
conclusions unchanged | JCAP07(2015)002 | 10.1088/1475-7516/2015/07/002 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the possibility to produce a bouncing universe in the framework
of scalar-tensor gravity models in which the scalar field potential may be
negative, and even unbounded from below. We find a set of viable solutions with
nonzero measure in the space of initial conditions passing a bounce, even in
the presen... | [
{
"created": "Wed, 29 Apr 2015 17:03:10 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Jun 2015 23:57:08 GMT",
"version": "v2"
}
] | 2015-07-15 | [
[
"Boisseau",
"B.",
""
],
[
"Giacomini",
"H.",
""
],
[
"Polarski",
"D.",
""
],
[
"Starobinsky",
"A. A.",
""
]
] | We consider the possibility to produce a bouncing universe in the framework of scalar-tensor gravity models in which the scalar field potential may be negative, and even unbounded from below. We find a set of viable solutions with nonzero measure in the space of initial conditions passing a bounce, even in the presence... |
gr-qc/0006040 | M. A. H. MacCallum | K. Rajesh Nayak, M.A.H. MacCallum and C.V. Vishveshwara | Black Holes in Non-flat Backgrounds: the Schwarzschild Black Hole in the
Einstein Universe | 8 pages, 3 postscript figures, minor corrections Journal Ref:
accepted for Physical Review D | Phys.Rev.D63:024020,2001 | 10.1103/PhysRevD.63.024020 | null | gr-qc | null | As an example of a black hole in a non-flat background a composite static
spacetime is constructed. It comprises a vacuum Schwarzschild spacetime for the
interior of the black hole across whose horizon it is matched on to the
spacetime of Vaidya representing a black hole in the background of the Einstein
universe. Th... | [
{
"created": "Mon, 12 Jun 2000 13:47:30 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Oct 2000 15:36:36 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Nayak",
"K. Rajesh",
""
],
[
"MacCallum",
"M. A. H.",
""
],
[
"Vishveshwara",
"C. V.",
""
]
] | As an example of a black hole in a non-flat background a composite static spacetime is constructed. It comprises a vacuum Schwarzschild spacetime for the interior of the black hole across whose horizon it is matched on to the spacetime of Vaidya representing a black hole in the background of the Einstein universe. The ... |
1001.1310 | Matt Visser | Matt Visser (Victoria University of Wellington), Carmen Molina-Paris
(Leeds University) | Acoustic geometry for general relativistic barotropic irrotational fluid
flow | V1: 23 pages, zero figures; V2: now 24 pages, some clarifications, 2
references added. This version accepted for publication in the New Journal of
Physics. (Special issue on "Classical and Quantum Analogues for Gravitational
Phenomena and Related Effects") | New J.Phys.12:095014,2010 | 10.1088/1367-2630/12/9/095014 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | "Acoustic spacetimes", in which techniques of differential geometry are used
to investigate sound propagation in moving fluids, have attracted considerable
attention over the last few decades. Most of the models currently considered in
the literature are based on non-relativistic barotropic irrotational fluids,
defin... | [
{
"created": "Fri, 8 Jan 2010 20:40:25 GMT",
"version": "v1"
},
{
"created": "Thu, 6 May 2010 09:18:33 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Visser",
"Matt",
"",
"Victoria University of Wellington"
],
[
"Molina-Paris",
"Carmen",
"",
"Leeds University"
]
] | "Acoustic spacetimes", in which techniques of differential geometry are used to investigate sound propagation in moving fluids, have attracted considerable attention over the last few decades. Most of the models currently considered in the literature are based on non-relativistic barotropic irrotational fluids, defined... |
1109.5782 | Takuya Tsuchiya | Takuya Tsuchiya, Gen Yoneda and Hisa-aki Shinkai | Constraint Propagation of $C^2$-adjusted Formulation II --- Another
Recipe for Robust Baumgarte-Shapiro-Shibata-Nakamura Evolution System --- | 12 pages, 10 figures. To be published in Phys. Rev. D | Phys.Rev.D85:044018,2012 | 10.1103/PhysRevD.85.044018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In order to obtain an evolution system which is robust against the violation
of constraints, we present a new set of evolution systems based on the
so-called Baumgarte-Shapiro-Shibata-Nakamura (BSSN) equations.The idea is to
add functional derivatives of the norm of constraints, $C^2$, to the evolution
equations, whi... | [
{
"created": "Tue, 27 Sep 2011 06:25:08 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Jan 2012 03:36:32 GMT",
"version": "v2"
}
] | 2015-05-30 | [
[
"Tsuchiya",
"Takuya",
""
],
[
"Yoneda",
"Gen",
""
],
[
"Shinkai",
"Hisa-aki",
""
]
] | In order to obtain an evolution system which is robust against the violation of constraints, we present a new set of evolution systems based on the so-called Baumgarte-Shapiro-Shibata-Nakamura (BSSN) equations.The idea is to add functional derivatives of the norm of constraints, $C^2$, to the evolution equations, which... |
0903.2087 | Leo Brewin | Leo Brewin | Riemann Normal Coordinate expansions using Cadabra | v2: Updated to version 2 of Cadabra and fixed computational errors;
v3: Corrected indices and sign on lhs of eqtns. 11.19a-d | Class.Quant.Grav.26:175017,2009 | 10.1088/0264-9381/26/17/175017 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Riemann normal coordinate expansions of the metric and other geometrical
quantities, including the geodesic arc-length, will be presented. All of the
results are given to fifth-order in the curvature and were obtained using the
computer algebra package Cadabra.
| [
{
"created": "Thu, 12 Mar 2009 01:58:34 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Dec 2019 19:19:58 GMT",
"version": "v2"
},
{
"created": "Fri, 4 Nov 2022 12:26:50 GMT",
"version": "v3"
}
] | 2022-11-07 | [
[
"Brewin",
"Leo",
""
]
] | Riemann normal coordinate expansions of the metric and other geometrical quantities, including the geodesic arc-length, will be presented. All of the results are given to fifth-order in the curvature and were obtained using the computer algebra package Cadabra. |
0704.0371 | Gilberto Medeiros Kremer | G. M. Kremer | Dark energy interacting with neutrinos and dark matter: a
phenomenological theory | 7 pages, 5 figures. To appear in GRG | Gen.Rel.Grav.39:965-972,2007 | 10.1007/s10714-007-0428-0 | null | gr-qc | null | A model for a flat homogeneous and isotropic Universe composed of dark
energy, dark matter, neutrinos, radiation and baryons is analyzed. The fields
of dark matter and neutrinos are supposed to interact with the dark energy. The
dark energy is considered to obey either the van der Waals or the Chaplygin
equations of ... | [
{
"created": "Tue, 3 Apr 2007 17:43:01 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kremer",
"G. M.",
""
]
] | A model for a flat homogeneous and isotropic Universe composed of dark energy, dark matter, neutrinos, radiation and baryons is analyzed. The fields of dark matter and neutrinos are supposed to interact with the dark energy. The dark energy is considered to obey either the van der Waals or the Chaplygin equations of st... |
2009.03354 | Lotte ter Haar | Lotte ter Haar, Miguel Bezares, Marco Crisostomi, Enrico Barausse,
Carlos Palenzuela | Dynamics of Screening in Modified Gravity | 6 pages, 3 figures; PRL version | Phys. Rev. Lett. 126, 091102 (2021) | 10.1103/PhysRevLett.126.091102 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational theories differing from General Relativity may explain the
accelerated expansion of the Universe without a cosmological constant. However,
to pass local gravitational tests, a "screening mechanism" is needed to
suppress, on small scales, the fifth force driving the cosmological
acceleration. We consider... | [
{
"created": "Mon, 7 Sep 2020 18:21:41 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Mar 2021 18:34:25 GMT",
"version": "v2"
}
] | 2021-03-02 | [
[
"ter Haar",
"Lotte",
""
],
[
"Bezares",
"Miguel",
""
],
[
"Crisostomi",
"Marco",
""
],
[
"Barausse",
"Enrico",
""
],
[
"Palenzuela",
"Carlos",
""
]
] | Gravitational theories differing from General Relativity may explain the accelerated expansion of the Universe without a cosmological constant. However, to pass local gravitational tests, a "screening mechanism" is needed to suppress, on small scales, the fifth force driving the cosmological acceleration. We consider t... |
2010.03971 | Vladimir Kassandrov | Vladimir V. Kassandrov, Nina V. Markova | Relativistic generalization of the Schrodinger-Newton model for the
wavefunction reduction | 5 pages. Talk presented at the 10-th Friedmann Seminar
(Saint-Petersburg, Russia, 2019) | International Journal of Modern Physics A 35, 2040017 (2020). Some
references and comments have been added | 10.1142/S0217751X20400175 | null | gr-qc hep-th nlin.PS quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the model of the self-gravity driven spontaneous wavefunction
reduction proposed by L. Diosi, R. Penrose et al. and based on a
self-consistent system of the Schrodinger and Poisson equations. An analogous
system of coupled Dirac and Maxwell-like equations is proposed as a
relativization. Regular solutions... | [
{
"created": "Wed, 7 Oct 2020 12:43:44 GMT",
"version": "v1"
}
] | 2020-10-09 | [
[
"Kassandrov",
"Vladimir V.",
""
],
[
"Markova",
"Nina V.",
""
]
] | We consider the model of the self-gravity driven spontaneous wavefunction reduction proposed by L. Diosi, R. Penrose et al. and based on a self-consistent system of the Schrodinger and Poisson equations. An analogous system of coupled Dirac and Maxwell-like equations is proposed as a relativization. Regular solutions t... |
gr-qc/9906036 | Albert Roura | Albert Roura and Enric Verdaguer | Mode decomposition and renormalization in semiclassical gravity | 4 pages, RevTeX, no figures | Phys.Rev. D60 (1999) 107503 | 10.1103/PhysRevD.60.107503 | null | gr-qc hep-th | null | We compute the influence action for a system perturbatively coupled to a
linear scalar field acting as the environment. Subtleties related to
divergences that appear when summing over all the modes are made explicit and
clarified. Being closely connected with models used in the literature, we show
how to completely r... | [
{
"created": "Thu, 10 Jun 1999 15:38:58 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Roura",
"Albert",
""
],
[
"Verdaguer",
"Enric",
""
]
] | We compute the influence action for a system perturbatively coupled to a linear scalar field acting as the environment. Subtleties related to divergences that appear when summing over all the modes are made explicit and clarified. Being closely connected with models used in the literature, we show how to completely rec... |
gr-qc/9510011 | Vanzo Luciano | Luciano Vanzo | Radiation from the extremal black holes | 4 pages, LaTex, no figures | Phys.Rev. D55 (1997) 2192-2201 | 10.1103/PhysRevD.55.2192 | University of Trento, UTF | gr-qc | null | The radiation from extreme Reissner-Nordstr\"{o}m black holes is computed by
explicitly considering the collapse of a spherical charged shell. No neutral
scalar radiation is found but there is emission of charged particles, provided
the charge to mass ratio be different from one. The absence of thermal effects
is in ... | [
{
"created": "Fri, 6 Oct 1995 16:46:32 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Vanzo",
"Luciano",
""
]
] | The radiation from extreme Reissner-Nordstr\"{o}m black holes is computed by explicitly considering the collapse of a spherical charged shell. No neutral scalar radiation is found but there is emission of charged particles, provided the charge to mass ratio be different from one. The absence of thermal effects is in ac... |
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