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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1408.3594 | Joel Franklin | Joel Franklin | Self-Consistent, Self-Coupled Scalar Gravity | A review and discussion of scalar, self-sourced gravity (originally
developed in [1], [2], [3], [8]), to appear in The American Journal of
Physics. v2 | null | 10.1119/1.4898585 | null | gr-qc physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A scalar theory of gravity extending Newtonian gravity to include field
energy as its source is developed. The physical implications of the theory are
probed through its spherically symmetric (source) solutions. The aim is to
demonstrate rational physical model building, together with physical and
experimental checks... | [
{
"created": "Fri, 15 Aug 2014 17:46:36 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Aug 2014 22:12:45 GMT",
"version": "v2"
}
] | 2015-06-22 | [
[
"Franklin",
"Joel",
""
]
] | A scalar theory of gravity extending Newtonian gravity to include field energy as its source is developed. The physical implications of the theory are probed through its spherically symmetric (source) solutions. The aim is to demonstrate rational physical model building, together with physical and experimental checks o... |
gr-qc/0104007 | Nathalie Deruelle | Nathalie Deruelle and Joseph Katz | Gravity on branes | 16 pages, plain TeX, no figures | Phys.Rev. D64 (2001) 083515 | 10.1103/PhysRevD.64.083515 | null | gr-qc astro-ph hep-th | null | We consider the four dimensional discontinuity generated by two identical
pieces of a five dimensional space pasted along their edge (that is a "brane"
in a "$Z_2$-symmetric" "bulk"). Using a four plus one decomposition of the
Riemann tensor we write the equations for gravity on the brane and recover in a
simple mann... | [
{
"created": "Mon, 2 Apr 2001 15:07:27 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Deruelle",
"Nathalie",
""
],
[
"Katz",
"Joseph",
""
]
] | We consider the four dimensional discontinuity generated by two identical pieces of a five dimensional space pasted along their edge (that is a "brane" in a "$Z_2$-symmetric" "bulk"). Using a four plus one decomposition of the Riemann tensor we write the equations for gravity on the brane and recover in a simple manner... |
2311.04822 | Nakia Carlevaro | Giovanni Montani, Nakia Carlevaro, Maria G. Dainotti | Slow-rolling scalar dynamics and as solution for the Hubble tension | 11 pages, 5 figures | Phys. Dark Univ. 44, 101486 (2024) | 10.1016/j.dark.2024.101486 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a theoretical framework to interpret the Hubble tension by means
of a slow-rolling dynamics of a self-interacting scalar field. In particular,
we split the Friedmann equation in order to construct a system for the three
unknowns, corresponding to the Hubble parameter $H$, the scalar field $\phi$
and its ... | [
{
"created": "Wed, 8 Nov 2023 16:48:49 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Apr 2024 17:01:58 GMT",
"version": "v2"
}
] | 2024-04-25 | [
[
"Montani",
"Giovanni",
""
],
[
"Carlevaro",
"Nakia",
""
],
[
"Dainotti",
"Maria G.",
""
]
] | We construct a theoretical framework to interpret the Hubble tension by means of a slow-rolling dynamics of a self-interacting scalar field. In particular, we split the Friedmann equation in order to construct a system for the three unknowns, corresponding to the Hubble parameter $H$, the scalar field $\phi$ and its se... |
0810.5255 | Christopher Eling | Christopher Eling and Jacob D. Bekenstein | Challenging the generalized second law | 29 pages, RevTex; v2: Computational error corrected and conclusions
of Sec. III D changed, Sec. II B enlarged, and Sec. IV is new. Title and
abstract changed to reflect new results and conclusions; v3: added minor
clarifying remarks, published version; v4: updated a reference | Phys.Rev.D79:024019,2009 | 10.1103/PhysRevD.79.024019 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The generalized second law (GSL) of black hole thermodynamics states that the
sum of changes in black hole entropy and the ordinary entropy of matter and
fields outside the hole must be non-negative. In the classical limit, the GSL
reduces to Hawking's area theorem. Neither law identifies the specific effects
which m... | [
{
"created": "Wed, 29 Oct 2008 11:53:31 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Dec 2008 11:57:57 GMT",
"version": "v2"
},
{
"created": "Tue, 24 Feb 2009 10:25:06 GMT",
"version": "v3"
},
{
"created": "Sun, 26 May 2013 18:45:35 GMT",
"version": "v4"
}
] | 2013-05-28 | [
[
"Eling",
"Christopher",
""
],
[
"Bekenstein",
"Jacob D.",
""
]
] | The generalized second law (GSL) of black hole thermodynamics states that the sum of changes in black hole entropy and the ordinary entropy of matter and fields outside the hole must be non-negative. In the classical limit, the GSL reduces to Hawking's area theorem. Neither law identifies the specific effects which mak... |
2307.02963 | Christian Dioguardi | Christian Dioguardi, Antonio Racioppi | Palatini $F(R,X)$: a new framework for inflationary attractors | 11 pages, 5 figures, major changes in section 2 and 3, added new
appendix A and B. Matches the published version | Phys.Dark Univ. 45 (2024) 101509 | 10.1016/j.dark.2024.101509 | null | gr-qc astro-ph.CO hep-ph | http://creativecommons.org/licenses/by/4.0/ | Palatini $F(R)$ gravity proved to be a powerful tool in order to realize
asymptotically flat inflaton potentials. Unfortunately, it also inevitably
implies higher-order inflaton kinetic terms in the Einstein frame that might
jeopardize the evolution of the system out of the slow-roll regime. We prove
that a $F(R+X)$ ... | [
{
"created": "Thu, 6 Jul 2023 13:00:23 GMT",
"version": "v1"
},
{
"created": "Mon, 6 May 2024 09:00:54 GMT",
"version": "v2"
}
] | 2024-05-14 | [
[
"Dioguardi",
"Christian",
""
],
[
"Racioppi",
"Antonio",
""
]
] | Palatini $F(R)$ gravity proved to be a powerful tool in order to realize asymptotically flat inflaton potentials. Unfortunately, it also inevitably implies higher-order inflaton kinetic terms in the Einstein frame that might jeopardize the evolution of the system out of the slow-roll regime. We prove that a $F(R+X)$ gr... |
gr-qc/9712016 | Matt Visser | Matt Visser (Washington University) | Hawking radiation without black hole entropy | Uses ReV_TeX 3.0; Five pages in two-column format | Phys.Rev.Lett. 80 (1998) 3436-3439 | 10.1103/PhysRevLett.80.3436 | null | gr-qc hep-th | null | In this Letter I point out that Hawking radiation is a purely kinematic
effect that is generic to Lorentzian geometries. Hawking radiation arises for
any test field on any Lorentzian geometry containing an event horizon
regardless of whether or not the Lorentzian geometry satisfies the dynamical
Einstein equations of... | [
{
"created": "Tue, 2 Dec 1997 23:35:39 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Visser",
"Matt",
"",
"Washington University"
]
] | In this Letter I point out that Hawking radiation is a purely kinematic effect that is generic to Lorentzian geometries. Hawking radiation arises for any test field on any Lorentzian geometry containing an event horizon regardless of whether or not the Lorentzian geometry satisfies the dynamical Einstein equations of g... |
1401.1402 | Saibal Ray | Farook Rahaman, Anirudh Pradhan, Nasr Ahmed, Saibal Ray, Bijan Saha
and Mosiur Rahaman | Fluid sphere: stability problem and dimensional constraint | 14 pages, 2 figures, major changes in text and references, accepted
in International Journal of Modern Physics D | null | 10.1142/S0218271815500492 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study different dimensional fluids inspired by noncommutative geometry
which admit conformal Killing vectors. The solutions of the Einstein field
equations examined specifically for five different set of spacetime. We
calculate the active gravitational mass and impose stability conditions of the
fluid sphere. The ... | [
{
"created": "Mon, 6 Jan 2014 18:00:36 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Apr 2015 15:03:00 GMT",
"version": "v2"
}
] | 2015-04-15 | [
[
"Rahaman",
"Farook",
""
],
[
"Pradhan",
"Anirudh",
""
],
[
"Ahmed",
"Nasr",
""
],
[
"Ray",
"Saibal",
""
],
[
"Saha",
"Bijan",
""
],
[
"Rahaman",
"Mosiur",
""
]
] | We study different dimensional fluids inspired by noncommutative geometry which admit conformal Killing vectors. The solutions of the Einstein field equations examined specifically for five different set of spacetime. We calculate the active gravitational mass and impose stability conditions of the fluid sphere. The an... |
0804.2240 | Gabriel Germ\'an | E. Galindo-Dellavalle, G.German, A. de la Macorra | Cosmology of the very early universe | null | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study cosmological solutions for the very early universe beginning at the
Planck scale for a universe containing radiation, curvature and, as a
simplification of a possible scalar field potential, a cosmological constant
term. The solutions are the natural counterpart of the well known results for a
post-inflation... | [
{
"created": "Mon, 14 Apr 2008 19:13:56 GMT",
"version": "v1"
}
] | 2010-01-30 | [
[
"Galindo-Dellavalle",
"E.",
""
],
[
"German",
"G.",
""
],
[
"de la Macorra",
"A.",
""
]
] | We study cosmological solutions for the very early universe beginning at the Planck scale for a universe containing radiation, curvature and, as a simplification of a possible scalar field potential, a cosmological constant term. The solutions are the natural counterpart of the well known results for a post-inflationar... |
gr-qc/0112041 | Jacek Dziarmaga | Jacek Dziarmaga | Analog Electromagnetism in a Symmetrized $^3$He-A | 5 pages in RevTex | null | null | null | gr-qc | null | We derive a low temperature effective action for the order parameter in a
symmetrized phase A of helium 3, where the Fermi velocity equals the
transversal velocity of low energy fermionic quasiparticles. The effective
action has a form of the electromagnetic action. This analog electromagnetism
is a part of the progr... | [
{
"created": "Tue, 18 Dec 2001 00:56:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dziarmaga",
"Jacek",
""
]
] | We derive a low temperature effective action for the order parameter in a symmetrized phase A of helium 3, where the Fermi velocity equals the transversal velocity of low energy fermionic quasiparticles. The effective action has a form of the electromagnetic action. This analog electromagnetism is a part of the program... |
2406.11985 | Carlos O. Lousto | Giuseppe Ficarra and Carlos O. Lousto (RIT) | Close Encounter of Three Black Holes III | 12 pages, 13 figures, 8 tables. arXiv admin note: text overlap with
arXiv:2308.07365 | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the three black hole scenario with numerical relativity techniques
to study hierarchical configurations where the inner binary contains highly
spinning black holes. We find that the merger time of the binary gets a delay
(with a number of orbits to merger increase), depending strongly with the
distance to ... | [
{
"created": "Mon, 17 Jun 2024 18:04:05 GMT",
"version": "v1"
}
] | 2024-06-19 | [
[
"Ficarra",
"Giuseppe",
"",
"RIT"
],
[
"Lousto",
"Carlos O.",
"",
"RIT"
]
] | We revisit the three black hole scenario with numerical relativity techniques to study hierarchical configurations where the inner binary contains highly spinning black holes. We find that the merger time of the binary gets a delay (with a number of orbits to merger increase), depending strongly with the distance to th... |
0904.1340 | Christos Tsagas | John D Barrow and Christos G Tsagas | On the stability of static ghost cosmologies | Matches published version | Class.Quant.Grav.26:195003,2009 | 10.1088/0264-9381/26/19/195003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the classical linear stability of a static universe filled with a
non-interacting mixture of isotropic radiation and a ghost scalar field. Unlike
the conventional Einstein static model, this cosmology is stable against
homogeneous and isotropic perturbations. This is shown by means of exact
oscillatory so... | [
{
"created": "Wed, 8 Apr 2009 13:45:26 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Nov 2009 13:49:37 GMT",
"version": "v2"
}
] | 2009-11-19 | [
[
"Barrow",
"John D",
""
],
[
"Tsagas",
"Christos G",
""
]
] | We consider the classical linear stability of a static universe filled with a non-interacting mixture of isotropic radiation and a ghost scalar field. Unlike the conventional Einstein static model, this cosmology is stable against homogeneous and isotropic perturbations. This is shown by means of exact oscillatory solu... |
gr-qc/0302003 | Frans Pretorius | Frans Pretorius and Luis Lehner | Adaptive Mesh Refinement for Characteristic Codes | 36 pages, 17 figures; updated to coincide with journal version | J.Comput.Phys. 198 (2004) 10-34 | 10.1016/j.jcp.2004.01.001 | null | gr-qc | null | The use of adaptive mesh refinement (AMR) techniques is crucial for accurate
and efficient simulation of higher dimensional spacetimes. In this work we
develop an adaptive algorithm tailored to the integration of finite difference
discretizations of wave-like equations using characteristic coordinates. We
demonstrate... | [
{
"created": "Mon, 3 Feb 2003 08:40:23 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Jul 2004 07:42:24 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Pretorius",
"Frans",
""
],
[
"Lehner",
"Luis",
""
]
] | The use of adaptive mesh refinement (AMR) techniques is crucial for accurate and efficient simulation of higher dimensional spacetimes. In this work we develop an adaptive algorithm tailored to the integration of finite difference discretizations of wave-like equations using characteristic coordinates. We demonstrate t... |
1611.06494 | Arturo Stabile | G. Lambiase, A. Stabile, An. Stabile | Casimir effect in Extended Theories of Gravity | 12 pages, 1 figure. arXiv admin note: text overlap with
arXiv:1503.08751 | Phys. Rev. D 95, 084019 (2017) | 10.1103/PhysRevD.95.084019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the Casimir vacuum energy density and the Casimir pressure for a
massless scalar field confined between two nearby parallel plates in a slightly
curved, static spacetime background, employing the weak field approximation in
the framework of Extended Theories of Gravity (ETG). Following a perturbative
approac... | [
{
"created": "Sun, 20 Nov 2016 10:21:47 GMT",
"version": "v1"
}
] | 2017-04-19 | [
[
"Lambiase",
"G.",
""
],
[
"Stabile",
"A.",
""
],
[
"Stabile",
"An.",
""
]
] | We study the Casimir vacuum energy density and the Casimir pressure for a massless scalar field confined between two nearby parallel plates in a slightly curved, static spacetime background, employing the weak field approximation in the framework of Extended Theories of Gravity (ETG). Following a perturbative approach ... |
gr-qc/9806101 | Fernando C. Lombardo | Fernando C. Lombardo, Mario Castagnino, and Luca Bombelli | From classical chaos to decoherence in Robertson-Walker cosmology | latex file; 13 pages. Minor changes have been added. To appear in
Mod. Phys. Lett. A | Mod.Phys.Lett. A14 (1999) 539 | 10.1142/S0217732399000596 | null | gr-qc | null | We analyse the relationship between classical chaos and particle creation in
Robertson-Walker cosmological models with gravity coupled to a scalar field.
Within our class of models chaos and particle production are seen to arise in
the same cases. Particle production is viewed as the seed of decoherence, which
both e... | [
{
"created": "Thu, 25 Jun 1998 19:37:37 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Mar 1999 17:42:15 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Lombardo",
"Fernando C.",
""
],
[
"Castagnino",
"Mario",
""
],
[
"Bombelli",
"Luca",
""
]
] | We analyse the relationship between classical chaos and particle creation in Robertson-Walker cosmological models with gravity coupled to a scalar field. Within our class of models chaos and particle production are seen to arise in the same cases. Particle production is viewed as the seed of decoherence, which both ena... |
2110.11957 | Krzysztof Urbanowski | Krzysztof Urbanowski | Cosmological "constant" in a universe born in the metastable false
vacuum state | 39 pages, 9 figures; new comments added, some typos corrected,
references added | The European Physical Journal C, vol. 82, issue 3, Article No:
242, (2022) | 10.1140/epjc/s10052-022-10195-2 | null | gr-qc astro-ph.CO hep-ph quant-ph | http://creativecommons.org/licenses/by/4.0/ | The cosmological constant $\Lambda$ is a measure of the energy density of the
vacuum. Therefore properties of the energy of the system in the metastable
vacuum state reflect properties of $\Lambda = \Lambda(t)$. We analyze
properties of the energy, $E(t)$, of a general quantum system in the metastable
state in variou... | [
{
"created": "Sat, 23 Oct 2021 08:29:50 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Oct 2021 14:00:48 GMT",
"version": "v2"
},
{
"created": "Tue, 8 Mar 2022 12:50:44 GMT",
"version": "v3"
}
] | 2022-03-23 | [
[
"Urbanowski",
"Krzysztof",
""
]
] | The cosmological constant $\Lambda$ is a measure of the energy density of the vacuum. Therefore properties of the energy of the system in the metastable vacuum state reflect properties of $\Lambda = \Lambda(t)$. We analyze properties of the energy, $E(t)$, of a general quantum system in the metastable state in various ... |
2402.04682 | Roldao da Rocha | R. Casadio, C. Noberto Souza, R. da Rocha | Gravitational decoupling and aerodynamics: black holes and analog
gravity in a jet propulsion lab | 38 pages, 10 figures, 1 ancillary Jupyter Notebook file | Eur. Phys. J. C 84 (2024) 767 | 10.1140/epjc/s10052-024-13131-8 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A connection is established between transonic sound waves propagating along a
de Laval nozzle and quasinormal modes emitted from hairy black holes obtained
with the gravitational decoupling method applied to the Reissner-Nordstr\"om
geometry. Aerodynamical features provide an analogue setup to experimentally
test flu... | [
{
"created": "Wed, 7 Feb 2024 09:14:12 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Aug 2024 15:40:25 GMT",
"version": "v2"
}
] | 2024-08-05 | [
[
"Casadio",
"R.",
""
],
[
"Souza",
"C. Noberto",
""
],
[
"da Rocha",
"R.",
""
]
] | A connection is established between transonic sound waves propagating along a de Laval nozzle and quasinormal modes emitted from hairy black holes obtained with the gravitational decoupling method applied to the Reissner-Nordstr\"om geometry. Aerodynamical features provide an analogue setup to experimentally test fluid... |
2209.02673 | Xiyuan Li | Xiyuan Li, Martin Houde, Jignesh Mohanty, S. R. Valluri | A Joint-Chirp-Rate-Time-Frequency Transform for BBH Merger Gravitational
Wave Signal Detection | 14 pages, 8 figures, 2 tables | null | null | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Low-latency detection of Binary Black Hole (BBH) and Binary Neutron Star
(BNS) merger Gravitational Wave (GW) signals is essential for enabling
multi-messenger observations of such systems. The merger GW signals have
varying frequencies and are contaminated by non-stationary noises. Earlier
studies of non-templated m... | [
{
"created": "Tue, 6 Sep 2022 17:38:06 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Oct 2022 16:07:15 GMT",
"version": "v2"
},
{
"created": "Mon, 2 Oct 2023 03:40:06 GMT",
"version": "v3"
}
] | 2023-10-03 | [
[
"Li",
"Xiyuan",
""
],
[
"Houde",
"Martin",
""
],
[
"Mohanty",
"Jignesh",
""
],
[
"Valluri",
"S. R.",
""
]
] | Low-latency detection of Binary Black Hole (BBH) and Binary Neutron Star (BNS) merger Gravitational Wave (GW) signals is essential for enabling multi-messenger observations of such systems. The merger GW signals have varying frequencies and are contaminated by non-stationary noises. Earlier studies of non-templated mer... |
gr-qc/0307048 | Giovanni Imponente | Giovanni Paolo Imponente and Giovanni Montani | On the Quasi-Isotropic Inflationary Solution | 14 pages with titlepage; accepted for publication on Int.Journ. of
Mod. Phys.D; reference added, small typos corrected | Int.J.Mod.Phys.D12:1845-1858,2003 | 10.1142/S0218271803003712 | null | gr-qc astro-ph | null | In this paper we find a solution for a quasi-isotropic inflationary Universe
which allows to introduce in the problem a certain degree of inhomogeneity. We
consider a model which generalize the (flat) FRW one by introducing a first
order inhomogeneous term, whose dynamics is induced by an effective
cosmological const... | [
{
"created": "Thu, 10 Jul 2003 09:58:24 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Jul 2003 12:23:27 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Imponente",
"Giovanni Paolo",
""
],
[
"Montani",
"Giovanni",
""
]
] | In this paper we find a solution for a quasi-isotropic inflationary Universe which allows to introduce in the problem a certain degree of inhomogeneity. We consider a model which generalize the (flat) FRW one by introducing a first order inhomogeneous term, whose dynamics is induced by an effective cosmological constan... |
1403.7147 | Davide Gerosa | Davide Gerosa, Richard O'Shaughnessy, Michael Kesden, Emanuele Berti,
Ulrich Sperhake | Distinguishing black-hole spin-orbit resonances by their
gravitational-wave signatures | Accepted for publication in Phys. Rev. D | Phys. Rev. D 89, 124025 (2014) | 10.1103/PhysRevD.89.124025 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If binary black holes form following the successive core collapses of
sufficiently massive binary stars, precessional dynamics may align their spins
$\mathbf S_1$ and $\mathbf S_2$ and the orbital angular momentum $\mathbf L$
into a plane in which they jointly precess about the total angular momentum
$\mathbf J$. The... | [
{
"created": "Thu, 27 Mar 2014 17:50:25 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Jul 2014 20:00:13 GMT",
"version": "v2"
}
] | 2014-07-04 | [
[
"Gerosa",
"Davide",
""
],
[
"O'Shaughnessy",
"Richard",
""
],
[
"Kesden",
"Michael",
""
],
[
"Berti",
"Emanuele",
""
],
[
"Sperhake",
"Ulrich",
""
]
] | If binary black holes form following the successive core collapses of sufficiently massive binary stars, precessional dynamics may align their spins $\mathbf S_1$ and $\mathbf S_2$ and the orbital angular momentum $\mathbf L$ into a plane in which they jointly precess about the total angular momentum $\mathbf J$. These... |
2210.16856 | Yen Chin Ong | Yen Chin Ong | On Black Hole Thermodynamics, Singularity, and Gravitational Entropy | An invited contribution to the topical volume
[https://link.springer.com/collections/hjjgajaagg] for the conference
"Singularity theorems, causality, and all that: A tribute to Roger Penrose"
(SCRI21), June 14-18, 2021 | Gen Relativ Gravit 54 (2022) 132 | 10.1007/s10714-022-03008-0 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Many fundamental issues remain for black hole thermodynamics after almost
half a century of its conception. For example, what are the underlying degrees
of freedom of a black hole horizon that give rise to said thermodynamical
properties? Furthermore, classical black holes also harbor a spacetime
singularity. Althoug... | [
{
"created": "Sun, 30 Oct 2022 14:46:21 GMT",
"version": "v1"
}
] | 2022-11-01 | [
[
"Ong",
"Yen Chin",
""
]
] | Many fundamental issues remain for black hole thermodynamics after almost half a century of its conception. For example, what are the underlying degrees of freedom of a black hole horizon that give rise to said thermodynamical properties? Furthermore, classical black holes also harbor a spacetime singularity. Although ... |
gr-qc/9503057 | Maria Bento | M.C. Bento and O. Bertolami | Cosmological Solutions of Higher-Curvature String Effective Theories
with Dilatons | 7 pages, plain Tex with panda.tex macro (included), no figures | Phys.Lett.B368:198-201,1996 | 10.1016/0370-2693(95)01519-1 | CERN-TH/95-63, DFTT 19/95 | gr-qc | null | We study the effect of higher-curvature terms in the string low-energy
effective actions on the cosmological solutions of the theory, up to
corrections quartic in the curvatures, for the bosonic and heterotic strings as
well as the type II superstring. We find that cosmological solutions exist for
all string types bu... | [
{
"created": "Wed, 29 Mar 1995 16:02:11 GMT",
"version": "v1"
}
] | 2009-10-16 | [
[
"Bento",
"M. C.",
""
],
[
"Bertolami",
"O.",
""
]
] | We study the effect of higher-curvature terms in the string low-energy effective actions on the cosmological solutions of the theory, up to corrections quartic in the curvatures, for the bosonic and heterotic strings as well as the type II superstring. We find that cosmological solutions exist for all string types but ... |
2201.03684 | Glenn D. Starkman | Craig Copi and Glenn D. Starkman | Gravitational glint: Detectable gravitational wave tails from stars and
compact objects | 6 pages, 2 figures | null | 10.1103/PhysRevLett.128.251101 | null | gr-qc astro-ph.CO astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | Observations of a merging neutron star binary in both gravitational waves, by
the Laser Interferometer Gravitational-wave Observatory (LIGO), and across the
spectrum of electromagnetic radiation, by myriad telescopes, have been used to
show that gravitational waves travel in vacuum at a speed that is
indistinguishabl... | [
{
"created": "Mon, 10 Jan 2022 22:58:30 GMT",
"version": "v1"
}
] | 2022-07-13 | [
[
"Copi",
"Craig",
""
],
[
"Starkman",
"Glenn D.",
""
]
] | Observations of a merging neutron star binary in both gravitational waves, by the Laser Interferometer Gravitational-wave Observatory (LIGO), and across the spectrum of electromagnetic radiation, by myriad telescopes, have been used to show that gravitational waves travel in vacuum at a speed that is indistinguishable ... |
2305.13278 | Frans Klinkhamer | F. R. Klinkhamer | Vacuum-defect wormholes and a mirror world | 20 pages, 4 figures, v6: published version | Acta Phys. Pol. B 54, 7-A3 (2023) | 10.5506/APhysPolB.54.7-A3 | KA-TP-08-2023 | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have recently discovered a smooth vacuum-wormhole solution of the
first-order equations of general relativity. Here, we obtain the corresponding
multiple-vacuum-wormhole solution. Assuming that our world is essentially
Minkowski spacetime with a large number of these vacuum-defect wormholes
inserted, there is then... | [
{
"created": "Mon, 22 May 2023 17:38:22 GMT",
"version": "v1"
},
{
"created": "Mon, 29 May 2023 17:15:36 GMT",
"version": "v2"
},
{
"created": "Mon, 12 Jun 2023 16:31:27 GMT",
"version": "v3"
},
{
"created": "Thu, 29 Jun 2023 14:26:55 GMT",
"version": "v4"
},
{
"c... | 2023-08-10 | [
[
"Klinkhamer",
"F. R.",
""
]
] | We have recently discovered a smooth vacuum-wormhole solution of the first-order equations of general relativity. Here, we obtain the corresponding multiple-vacuum-wormhole solution. Assuming that our world is essentially Minkowski spacetime with a large number of these vacuum-defect wormholes inserted, there is then a... |
1508.07944 | Mubasher Jamil | Sebastian Bahamonde, Mubasher Jamil | Accretion Processes for General Spherically Symmetric Compact Objects | 10 pages, 15 figures, v2 accepted for publication in 'European
Physical Journal C' | Eur. Phys. J. C (2015) 75:508 | 10.1140/epjc/s10052-015-3734-9 | null | gr-qc astro-ph.SR math.CT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the accretion process for different spherically symmetric
space-time geometries for a static fluid. We analyse this procedure using the
most general black hole metric ansatz. After that, we examine the accretion
process for specific spherically symmetric metrics obtaining the velocity of
the sound duri... | [
{
"created": "Mon, 31 Aug 2015 18:21:14 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Oct 2015 16:43:05 GMT",
"version": "v2"
}
] | 2015-10-30 | [
[
"Bahamonde",
"Sebastian",
""
],
[
"Jamil",
"Mubasher",
""
]
] | We investigate the accretion process for different spherically symmetric space-time geometries for a static fluid. We analyse this procedure using the most general black hole metric ansatz. After that, we examine the accretion process for specific spherically symmetric metrics obtaining the velocity of the sound during... |
1607.03776 | Adrian Manning | Archil Kobakhidze, Cyril Lagger and Adrian Manning | Constraining non-commutative space-time from GW150914 | 18 pages | Phys. Rev. D 94, 064033 (2016) | 10.1103/PhysRevD.94.064033 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitational wave signal GW150914, recently detected by LIGO and Virgo
collaborations, is used to place a bound on the scale of quantum fuzziness of
non-commutative space-time. We show that the leading non-commutative correction
to the phase of the gravitational waves produced by a binary system appears at
the 2... | [
{
"created": "Mon, 4 Jul 2016 11:26:31 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Nov 2016 01:50:40 GMT",
"version": "v2"
}
] | 2016-11-22 | [
[
"Kobakhidze",
"Archil",
""
],
[
"Lagger",
"Cyril",
""
],
[
"Manning",
"Adrian",
""
]
] | The gravitational wave signal GW150914, recently detected by LIGO and Virgo collaborations, is used to place a bound on the scale of quantum fuzziness of non-commutative space-time. We show that the leading non-commutative correction to the phase of the gravitational waves produced by a binary system appears at the 2nd... |
1106.1743 | Subenoy Chakraborty | Sudeshna Mukerji, Nairwita Mazumder, Ritabrata Biswas, Subenoy
Chakraborty | Emergent scenario and different anisotropic models | 14 pages, 18 figures | Int.J.Theor.Phys.50:2708-2719,2011 | 10.1007/s10773-011-0769-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, Emergent Universe scenario has been developed in general
homogeneous anisotropic model and for the inhomogeneus LTB model. In the first
case, it is assumed that the matter in the universe has two components - one is
perfect fluid with barotropic equation of state $p=\omega\rho$ ($\omega$, a
constant) an... | [
{
"created": "Thu, 9 Jun 2011 08:48:55 GMT",
"version": "v1"
}
] | 2011-11-10 | [
[
"Mukerji",
"Sudeshna",
""
],
[
"Mazumder",
"Nairwita",
""
],
[
"Biswas",
"Ritabrata",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | In this work, Emergent Universe scenario has been developed in general homogeneous anisotropic model and for the inhomogeneus LTB model. In the first case, it is assumed that the matter in the universe has two components - one is perfect fluid with barotropic equation of state $p=\omega\rho$ ($\omega$, a constant) and ... |
gr-qc/0211006 | Piotr Chrusciel | M. Anderson, P.T. Chrusciel, E. Delay | Non-trivial, static, geodesically complete, vacuum space-times with a
negative cosmological constant | 28 pages, latex2e | JHEP 0210 (2002) 063 | 10.1088/1126-6708/2002/10/063 | null | gr-qc math.DG | null | We construct a large class of new singularity-free static Lorentzian
four-dimensional solutions of the vacuum Einstein equations with a negative
cosmological constant. The new families of metrics contain space-times with, or
without, black hole regions. Two uniqueness results are also established.
| [
{
"created": "Fri, 1 Nov 2002 20:48:38 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Anderson",
"M.",
""
],
[
"Chrusciel",
"P. T.",
""
],
[
"Delay",
"E.",
""
]
] | We construct a large class of new singularity-free static Lorentzian four-dimensional solutions of the vacuum Einstein equations with a negative cosmological constant. The new families of metrics contain space-times with, or without, black hole regions. Two uniqueness results are also established. |
2111.04912 | Sumanta Chakraborty | Sumanta Chakraborty | Bound on photon circular orbits in general relativity and beyond | Invited contribution, 25 pages, no figures | Galaxies 9, 96 (2021) | 10.3390/galaxies9040096 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Existence of a photon circular orbit can tell us a lot about the nature of
the underlying spacetime, since it plays a pivotal role in the understanding of
the characteristic signatures of compact objects, namely the quasi-normal modes
and shadow radius. For this purpose, determination of the location of the
photon ci... | [
{
"created": "Tue, 9 Nov 2021 02:24:37 GMT",
"version": "v1"
}
] | 2021-11-10 | [
[
"Chakraborty",
"Sumanta",
""
]
] | Existence of a photon circular orbit can tell us a lot about the nature of the underlying spacetime, since it plays a pivotal role in the understanding of the characteristic signatures of compact objects, namely the quasi-normal modes and shadow radius. For this purpose, determination of the location of the photon circ... |
2011.12174 | Jonathan Gorard | Jonathan Gorard | Algorithmic Causal Sets and the Wolfram Model | 100 pages, 72 figures | null | null | null | gr-qc cs.DM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The formal relationship between two differing approaches to the description
of spacetime as an intrinsically discrete mathematical structure, namely causal
set theory and the Wolfram model, is studied, and it is demonstrated that the
hypergraph rewriting approach of the Wolfram model can effectively be
interpreted as... | [
{
"created": "Mon, 23 Nov 2020 16:54:30 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Oct 2021 14:18:40 GMT",
"version": "v2"
}
] | 2021-10-19 | [
[
"Gorard",
"Jonathan",
""
]
] | The formal relationship between two differing approaches to the description of spacetime as an intrinsically discrete mathematical structure, namely causal set theory and the Wolfram model, is studied, and it is demonstrated that the hypergraph rewriting approach of the Wolfram model can effectively be interpreted as p... |
2309.16367 | Leonid Sarieddine | Leonid Sarieddine | Newtonian and Post-Newtonian Aspects of Mimetic Gravity | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Mimetic gravity is a modified theory of gravity which is able to incorporate
dark matter into the underlying geometry of space-time by isolating the
conformal degree of freedom. The theory has been studied extensively in the
cosmological regime, as such, we set out to study the implications of the
theory at astrophys... | [
{
"created": "Thu, 28 Sep 2023 12:11:44 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Dec 2023 00:14:25 GMT",
"version": "v2"
}
] | 2023-12-08 | [
[
"Sarieddine",
"Leonid",
""
]
] | Mimetic gravity is a modified theory of gravity which is able to incorporate dark matter into the underlying geometry of space-time by isolating the conformal degree of freedom. The theory has been studied extensively in the cosmological regime, as such, we set out to study the implications of the theory at astrophysic... |
2110.15396 | Ruslan Muharlyamov | Ruslan K. Muharlyamov, Tatiana N. Pankratyeva | Reconstruction method in the kinetic gravity braiding theory with
shift-symmetric | null | Eur. Phys. J. Plus 136, 590 (2021) | 10.1140/epjp/s13360-021-01607-5 | null | gr-qc | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We present a reconstruction method for flat Friedman-Robertson-Walker (FRW)
spacetime in a subclass of Horndeski theory -- specifically shiftsymmetric, the
kinetic gravity braiding (KGB) theory with a non-vanishing conserved current.
Choosing the form of the Hubble parameter and kinetic density $X$, we restore
the fu... | [
{
"created": "Thu, 28 Oct 2021 18:38:19 GMT",
"version": "v1"
}
] | 2021-11-01 | [
[
"Muharlyamov",
"Ruslan K.",
""
],
[
"Pankratyeva",
"Tatiana N.",
""
]
] | We present a reconstruction method for flat Friedman-Robertson-Walker (FRW) spacetime in a subclass of Horndeski theory -- specifically shiftsymmetric, the kinetic gravity braiding (KGB) theory with a non-vanishing conserved current. Choosing the form of the Hubble parameter and kinetic density $X$, we restore the func... |
0903.5405 | J\"org Hennig | Marcus Ansorg, J\"org Hennig | Inner Cauchy horizon of axisymmetric and stationary black holes with
surrounding matter in Einstein-Maxwell theory | 4 pages, 1 figure | Phys. Rev. Lett. 102, 221102 (2009) | 10.1103/PhysRevLett.102.221102 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the interior electrovacuum region of axisymmetric and stationary
black holes with surrounding matter and find that there exists always a regular
inner Cauchy horizon inside the black hole, provided the angular momentum $J$
and charge $Q$ of the black hole do not vanish simultaneously. In particular,
we deriv... | [
{
"created": "Tue, 31 Mar 2009 09:03:25 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Jun 2009 07:57:36 GMT",
"version": "v2"
}
] | 2009-11-04 | [
[
"Ansorg",
"Marcus",
""
],
[
"Hennig",
"Jörg",
""
]
] | We study the interior electrovacuum region of axisymmetric and stationary black holes with surrounding matter and find that there exists always a regular inner Cauchy horizon inside the black hole, provided the angular momentum $J$ and charge $Q$ of the black hole do not vanish simultaneously. In particular, we derive ... |
1104.0768 | Vladimir Dzhunushaliev | Vladimir Dzhunushaliev | Asymptotically flat gravitating spinor field solutions. Step 3 -
Einstein-Dirac equations: cylindric case | the sign of the energy - momentum tensor of spinor is discussed | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Einstein-Dirac equations for two spinor fields are considered. It is shown
that in this case one can obtain self-consistent equations set for these
gravitating spinors. The key idea to obtain Einstein-Dirac equations is to use
special ans\"atze for spinor fields in order to zero some off-diagonal
componentes of the s... | [
{
"created": "Tue, 5 Apr 2011 08:34:27 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Apr 2011 08:09:40 GMT",
"version": "v2"
}
] | 2011-04-18 | [
[
"Dzhunushaliev",
"Vladimir",
""
]
] | Einstein-Dirac equations for two spinor fields are considered. It is shown that in this case one can obtain self-consistent equations set for these gravitating spinors. The key idea to obtain Einstein-Dirac equations is to use special ans\"atze for spinor fields in order to zero some off-diagonal componentes of the spi... |
1208.2132 | Alexander Kaganovich B. | E. I. Guendelman and A. B. Kaganovich | Neutrino generated dynamical dark energy with no dark energy field | 27 pages, 17 figures, changes in the text and figures without
changing of the main results | null | 10.1103/PhysRevD.87.044021 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dynamical dark energy (DE) phenomenon emerges as a geometrical effect
accompanying the cosmological expansion of nonrelativistic fermionic matter.
This occurs without the need for any fluid, like e.g. dynamical scalar field
(quintessence, cosmon, etc.), and with conventional form of the Einstein
equations in contrast... | [
{
"created": "Fri, 10 Aug 2012 09:51:41 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Aug 2012 18:27:12 GMT",
"version": "v2"
},
{
"created": "Wed, 5 Dec 2012 20:25:40 GMT",
"version": "v3"
}
] | 2013-03-14 | [
[
"Guendelman",
"E. I.",
""
],
[
"Kaganovich",
"A. B.",
""
]
] | Dynamical dark energy (DE) phenomenon emerges as a geometrical effect accompanying the cosmological expansion of nonrelativistic fermionic matter. This occurs without the need for any fluid, like e.g. dynamical scalar field (quintessence, cosmon, etc.), and with conventional form of the Einstein equations in contrast t... |
2205.00264 | Paul R. Anderson | Paul R. Anderson, Zachary P. Scofield, and Jennie Traschen | Linear growth of the two-point function for the Unruh state in $1+1$
dimensional black holes | 10 pages, 2 figures, to appear in the Proceedings of the Sixteenth
Marcel Grossmann Meeting | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The symmetric two-point function for a massless, minimally coupled scalar
field in the Unruh state is examined for Schwarzschild-de Sitter spacetime in
two dimensions. This function grows linearly in terms of a time coordinate that
is well-defined on the future black hole and cosmological horizons, when the
points ar... | [
{
"created": "Sat, 30 Apr 2022 13:12:35 GMT",
"version": "v1"
}
] | 2022-05-03 | [
[
"Anderson",
"Paul R.",
""
],
[
"Scofield",
"Zachary P.",
""
],
[
"Traschen",
"Jennie",
""
]
] | The symmetric two-point function for a massless, minimally coupled scalar field in the Unruh state is examined for Schwarzschild-de Sitter spacetime in two dimensions. This function grows linearly in terms of a time coordinate that is well-defined on the future black hole and cosmological horizons, when the points are ... |
1307.4523 | Salvatore Capozziello | Salvatore Capozziello, Mariafelicia De Laurentis | Extended Gravity: State of the Art and Perspectives | 16 pages, Proceedings of the Thirteenth Marcel Grossman Meeting on
General Relativity (Stockholm, 2012) edited by Kjell Rosquist, Robert T
Jantzen, Remo Ruffini World Scientific, Singapore, 2013 | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We shortly review the state of art and perspectives of Extended Theories of
Gravity.
| [
{
"created": "Wed, 17 Jul 2013 07:44:41 GMT",
"version": "v1"
}
] | 2013-07-18 | [
[
"Capozziello",
"Salvatore",
""
],
[
"De Laurentis",
"Mariafelicia",
""
]
] | We shortly review the state of art and perspectives of Extended Theories of Gravity. |
0903.3617 | Plamen Fiziev | Roumen S. Borissov, Plamen P. Fiziev | Exact Solutions of Teukolsky Master Equation with Continuous Spectrum | 25 pages, no figures, LaTeX file, corrections in some formulas, new
references added, amendments in the text, authors contribution described and
added | Bulg.J.Phys. 37 ( 2010) 65 89 | null | SU-03-09 | gr-qc astro-ph.HE hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Weak gravitational, electromagnetic, neutrino and scalar fields, considered
as perturbations on Kerr background satisfy Teukolsky Master Equation. The two
non-trivial equations obtained after separating the variables are the polar
angle equation and the radial equation. We solve them by transforming each one
into the... | [
{
"created": "Mon, 23 Mar 2009 12:36:36 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Apr 2009 16:59:06 GMT",
"version": "v2"
},
{
"created": "Sun, 18 Jul 2010 10:19:38 GMT",
"version": "v3"
}
] | 2014-10-14 | [
[
"Borissov",
"Roumen S.",
""
],
[
"Fiziev",
"Plamen P.",
""
]
] | Weak gravitational, electromagnetic, neutrino and scalar fields, considered as perturbations on Kerr background satisfy Teukolsky Master Equation. The two non-trivial equations obtained after separating the variables are the polar angle equation and the radial equation. We solve them by transforming each one into the f... |
gr-qc/0212117 | Tomoya Tsushima | Tomoya Tsushima | The expectation value of the metric operator with respect to Gaussian
weave state in loop quantum gravity | 20 pages, 2 figures, submitted to Phys. Rev. D | null | null | KANAZAWA-02-39 | gr-qc | null | Loop Quantum Gravity is the major candidate of quantum gravity. It is
interesting to consider its continuum limit, which corresponds to the classical
limit. We consider the Gaussian weave state, which describes a semi-classical
picture. We calculate the expectation value of metric operator with respect to
this state.... | [
{
"created": "Sat, 28 Dec 2002 07:41:17 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Jan 2003 11:32:16 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Nov 2003 09:05:52 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Tsushima",
"Tomoya",
""
]
] | Loop Quantum Gravity is the major candidate of quantum gravity. It is interesting to consider its continuum limit, which corresponds to the classical limit. We consider the Gaussian weave state, which describes a semi-classical picture. We calculate the expectation value of metric operator with respect to this state. |
1909.09619 | Vladimir Dergachev Ph.D. | Vladimir Dergachev and Maria Alessandra Papa | Results from an extended Falcon all-sky survey for continuous
gravitational waves | null | Phys. Rev. D 101, 022001 (2020) | 10.1103/PhysRevD.101.022001 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the results of an all-sky search for continuous gravitational wave
signals with frequencies in the 200-600 Hz range and frequency derivative
(spindown) from -1e-8 through 1.11e-9 Hz/s. Together with the results from [1],
this search completes the all-sky survey for frequencies between 20 to 600 Hz
on O1 da... | [
{
"created": "Fri, 20 Sep 2019 17:12:11 GMT",
"version": "v1"
}
] | 2020-01-22 | [
[
"Dergachev",
"Vladimir",
""
],
[
"Papa",
"Maria Alessandra",
""
]
] | We present the results of an all-sky search for continuous gravitational wave signals with frequencies in the 200-600 Hz range and frequency derivative (spindown) from -1e-8 through 1.11e-9 Hz/s. Together with the results from [1], this search completes the all-sky survey for frequencies between 20 to 600 Hz on O1 data... |
gr-qc/0208026 | Guilherme de Berredo-Peixoto | G. de Berredo-Peixoto (University of Alberta) | On the static solutions in gravity with massive scalar field in three
dimensions | 11 pages, LaTeX, 1 Postscript figure. Some changes were done | Class. Quantum Grav. 20 (2003) 3983-3992 | 10.1088/0264-9381/20/19/311 | null | gr-qc | null | We investigate circularly symmetric static solutions in three-dimensional
gravity with a minimally coupled massive scalar field. We integrate numerically
the field equations assuming asymptotic flatness, where black holes do not
exist and a naked singularity is present. We also give a brief review on the
massless cas... | [
{
"created": "Mon, 12 Aug 2002 19:34:53 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Aug 2002 23:30:44 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Sep 2003 01:05:32 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"de Berredo-Peixoto",
"G.",
"",
"University of Alberta"
]
] | We investigate circularly symmetric static solutions in three-dimensional gravity with a minimally coupled massive scalar field. We integrate numerically the field equations assuming asymptotic flatness, where black holes do not exist and a naked singularity is present. We also give a brief review on the massless cases... |
gr-qc/9610041 | Jerry Griffiths | Jiri Bicak and Jerry B. Griffiths | Gravitational waves propagating into Friedmann--Robertson--Walker
universes | 26 pages, LaTeX, 8 figures not included. To be published in the
November issue of Annals of Physics | Annals Phys. 252 (1996) 180-210 | 10.1006/aphy.1996.0128 | null | gr-qc | null | We consider space-times with two isometries which represent gravitational
waves with distinct wavefronts which propagate into exact
Friedmann-Robertson-Walker (FRW) universes. The geometry of possible wavefronts
is analysed in detail in all three types of FRW models. In the spatially flat
and open universes, the wave... | [
{
"created": "Fri, 18 Oct 1996 11:06:37 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Bicak",
"Jiri",
""
],
[
"Griffiths",
"Jerry B.",
""
]
] | We consider space-times with two isometries which represent gravitational waves with distinct wavefronts which propagate into exact Friedmann-Robertson-Walker (FRW) universes. The geometry of possible wavefronts is analysed in detail in all three types of FRW models. In the spatially flat and open universes, the wavefr... |
1801.04957 | Jose Wadih Maluf Dr. | J. W. Maluf, J. F. da Rocha-Neto, S. C. Ulhoa and F. L. Carneiro | Kinetic Energy and Angular Momentum of Free Particles in the Gyratonic
pp-Waves Space-times | 15 pages, 13 figures; References added, all figures were revised | Classical and Quantum Gravity Vol. 35, 115001 (2018) | 10.1088/1361-6382/aabd4e | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gyratonic pp-waves are exact solutions of Einstein's equations that represent
non-linear gravitational waves endowed with angular momentum. We consider
gyratonic pp-waves that travel in the $z$ direction and whose time dependence
on the variable $u={1 \over \sqrt{2}}(z-t)$ is given by gaussians, so that the
waves rep... | [
{
"created": "Mon, 15 Jan 2018 19:21:19 GMT",
"version": "v1"
},
{
"created": "Wed, 2 May 2018 17:31:33 GMT",
"version": "v2"
}
] | 2018-05-03 | [
[
"Maluf",
"J. W.",
""
],
[
"da Rocha-Neto",
"J. F.",
""
],
[
"Ulhoa",
"S. C.",
""
],
[
"Carneiro",
"F. L.",
""
]
] | Gyratonic pp-waves are exact solutions of Einstein's equations that represent non-linear gravitational waves endowed with angular momentum. We consider gyratonic pp-waves that travel in the $z$ direction and whose time dependence on the variable $u={1 \over \sqrt{2}}(z-t)$ is given by gaussians, so that the waves repre... |
gr-qc/0012080 | Roustam M. Zalaletdinov | Giovanni Montani (ICRA, University of Rome), Remo Ruffini (ICRA,
University of Roma) and Roustam Zalaletdinov (ICRA, Univeristy of Rome and
Institute of Nuclear Physics, Tashkent) | Gravitating macroscopic media in general relativity | 11 pages, LateX2e, requires cimento.cls available at
ftp://ftp.sif.it/pub/tex/cimento/, to be published in Nuovo Cimento B | Nuovo Cim.B115:1343-1354,2000 | null | null | gr-qc | null | The problem of construction of a continuous (macroscopic) matter model for a
given point-like (microscopic) matter distribution in general relativity is
formulated. The existing approaches are briefly reviewed and a physical analogy
with the similar problem in classical macroscopic electrodynamics is pointed
out. The... | [
{
"created": "Wed, 20 Dec 2000 14:13:43 GMT",
"version": "v1"
}
] | 2010-11-11 | [
[
"Montani",
"Giovanni",
"",
"ICRA, University of Rome"
],
[
"Ruffini",
"Remo",
"",
"ICRA,\n University of Roma"
],
[
"Zalaletdinov",
"Roustam",
"",
"ICRA, Univeristy of Rome and\n Institute of Nuclear Physics, Tashkent"
]
] | The problem of construction of a continuous (macroscopic) matter model for a given point-like (microscopic) matter distribution in general relativity is formulated. The existing approaches are briefly reviewed and a physical analogy with the similar problem in classical macroscopic electrodynamics is pointed out. The p... |
2203.11680 | Konstantin Leyde | Konstantin Leyde, Simone Mastrogiovanni, Dani\`ele A. Steer, Eric
Chassande-Mottin, Christos Karathanasis | Current and future constraints on cosmology and modified gravitational
wave friction from binary black holes | Contribution to the 2022 Gravitation session of the 56th Rencontres
de Moriond | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this proceedings, we are interested in dark gravitational wave standard
sirens and their use for cosmology and for constraining modified gravity
theories. Due to the extra friction term introduced in their propagation
equation those theories predict different luminosity distances for
electromagnetic and gravitatio... | [
{
"created": "Mon, 21 Mar 2022 16:18:16 GMT",
"version": "v1"
}
] | 2022-09-15 | [
[
"Leyde",
"Konstantin",
""
],
[
"Mastrogiovanni",
"Simone",
""
],
[
"Steer",
"Danièle A.",
""
],
[
"Chassande-Mottin",
"Eric",
""
],
[
"Karathanasis",
"Christos",
""
]
] | In this proceedings, we are interested in dark gravitational wave standard sirens and their use for cosmology and for constraining modified gravity theories. Due to the extra friction term introduced in their propagation equation those theories predict different luminosity distances for electromagnetic and gravitationa... |
1808.04328 | Sebasti\'an Bahamonde | Sebastian Bahamonde, Kazuharu Bamba, Ugur Camci | New Exact Spherically Symmetric Solutions in $f(R,\phi,X)$ gravity by
Noether's symmetry approach | Accepted for publication in JCAP. The title and the abstract have
been changed and new exact solutions have been added with more cases. The
existence of horizons of our solutions has been discussed too | null | 10.1088/1475-7516/2019/02/016 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The exact solutions of spherically symmetric space-times are explored by
using Noether symmetries in $f(R,\phi,X)$ gravity with $R$ the scalar
curvature, $\phi$ a scalar field and $X$ the kinetic term of $\phi$. Some of
these solutions can represent new black holes solutions in this extended theory
of gravity. The cl... | [
{
"created": "Mon, 13 Aug 2018 16:42:34 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Feb 2019 09:20:25 GMT",
"version": "v2"
}
] | 2019-02-20 | [
[
"Bahamonde",
"Sebastian",
""
],
[
"Bamba",
"Kazuharu",
""
],
[
"Camci",
"Ugur",
""
]
] | The exact solutions of spherically symmetric space-times are explored by using Noether symmetries in $f(R,\phi,X)$ gravity with $R$ the scalar curvature, $\phi$ a scalar field and $X$ the kinetic term of $\phi$. Some of these solutions can represent new black holes solutions in this extended theory of gravity. The clas... |
2205.12836 | Archit Vidyarthi | Sukanta Panda, Abbas Altafhussain Tinwala and Archit Vidyarthi | Ultraviolet Unitarity Violations in Non-minimally Coupled
Scalar-Starobinsky Inflation | Major changes: Calculation extended for general potentials with extra
sections for specific inflationary scenarios; abstract and conclusions
modified accordingly. Minor changes: added references; typographical errors
corrected | JCAP01(2023)029 | 10.1088/1475-7516/2023/01/029 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform the calculation for tree-level ultraviolet unitarity violation
scales for scalar-$R^2$ inflation models by including an additional $R^2
|\Phi|^2$-type term. Due to certain constraints, we resort to the Einstein
frame for our calculations, where we separate our analysis between metric and
Palatini formulati... | [
{
"created": "Wed, 25 May 2022 15:04:27 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Oct 2022 12:45:26 GMT",
"version": "v2"
},
{
"created": "Tue, 24 Jan 2023 09:23:07 GMT",
"version": "v3"
}
] | 2023-02-01 | [
[
"Panda",
"Sukanta",
""
],
[
"Tinwala",
"Abbas Altafhussain",
""
],
[
"Vidyarthi",
"Archit",
""
]
] | We perform the calculation for tree-level ultraviolet unitarity violation scales for scalar-$R^2$ inflation models by including an additional $R^2 |\Phi|^2$-type term. Due to certain constraints, we resort to the Einstein frame for our calculations, where we separate our analysis between metric and Palatini formulation... |
gr-qc/0403026 | Matt Visser | A J M Medved, Damien Martin, and Matt Visser | Dirty black holes: Symmetries at stationary non-static horizons | 21 pages; plain LaTeX | Phys.Rev. D70 (2004) 024009 | 10.1103/PhysRevD.70.024009 | null | gr-qc | null | We establish that the Einstein tensor takes on a highly symmetric form near
the Killing horizon of any stationary but non-static (and non-extremal) black
hole spacetime. [This follows up on a recent article by the current authors,
gr-qc/0402069, which considered static black holes.] Specifically, at any such
Killing ... | [
{
"created": "Fri, 5 Mar 2004 05:52:52 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Medved",
"A J M",
""
],
[
"Martin",
"Damien",
""
],
[
"Visser",
"Matt",
""
]
] | We establish that the Einstein tensor takes on a highly symmetric form near the Killing horizon of any stationary but non-static (and non-extremal) black hole spacetime. [This follows up on a recent article by the current authors, gr-qc/0402069, which considered static black holes.] Specifically, at any such Killing ho... |
1204.4651 | Ramon Torres | Francesc Fayos and Ramon Torres | On the causal characterization of singularities in spherically symmetric
spacetimes | null | Class. Quantum Grav. 28 (2011) 215023 | 10.1088/0264-9381/28/21/215023 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The causal character of the zero-areal-radius (R=0) singularity in
spherically symmetric spacetimes is studied. By using the techniques of the
qualitative behaviour of dynamic systems, we are able to present the most
comprehensive scheme so far to try to find out their causal characterization,
taking into account and... | [
{
"created": "Fri, 20 Apr 2012 14:52:26 GMT",
"version": "v1"
}
] | 2012-04-23 | [
[
"Fayos",
"Francesc",
""
],
[
"Torres",
"Ramon",
""
]
] | The causal character of the zero-areal-radius (R=0) singularity in spherically symmetric spacetimes is studied. By using the techniques of the qualitative behaviour of dynamic systems, we are able to present the most comprehensive scheme so far to try to find out their causal characterization, taking into account and a... |
1501.07405 | Iwo Bialynicki-Birula | Iwo Bialynicki-Birula | Quantum fluctuations of geometry in hot Universe | 11 pages A new significantly expanded version | Class. Quantum Grav. 32, 215015 (2015) | 10.1088/0264-9381/32/21/215015 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The fluctuations of spacetime geometries at finite temperature are evaluated
within the linearized theory of gravity. These fluctuations are described by
the probability distribution of various configurations of the gravitational
field. The field configurations are described by the linearized Riemann-Weyl
tensor with... | [
{
"created": "Thu, 29 Jan 2015 10:29:59 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Feb 2015 10:21:50 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Sep 2015 16:29:49 GMT",
"version": "v3"
}
] | 2015-10-13 | [
[
"Bialynicki-Birula",
"Iwo",
""
]
] | The fluctuations of spacetime geometries at finite temperature are evaluated within the linearized theory of gravity. These fluctuations are described by the probability distribution of various configurations of the gravitational field. The field configurations are described by the linearized Riemann-Weyl tensor withou... |
1805.10809 | Donato Bini | Donato Bini and Thibault Damour | Gravitational spin-orbit coupling in binary systems at the second
post-Minkowskian approximation | 30 pages, 2 figures, RevTeX Macros | Phys. Rev. D 98, 044036 (2018) | 10.1103/PhysRevD.98.044036 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the rotations, during a scattering encounter, of the spins of two
gravitationally interacting particles at second-order in the gravitational
constant (second post-Minkowskian order). Following a strategy introduced in
Phys. Rev. D {\bf 96}, 104038 (2017), we transcribe our result into a
correspondingly imp... | [
{
"created": "Mon, 28 May 2018 08:23:36 GMT",
"version": "v1"
}
] | 2018-08-29 | [
[
"Bini",
"Donato",
""
],
[
"Damour",
"Thibault",
""
]
] | We compute the rotations, during a scattering encounter, of the spins of two gravitationally interacting particles at second-order in the gravitational constant (second post-Minkowskian order). Following a strategy introduced in Phys. Rev. D {\bf 96}, 104038 (2017), we transcribe our result into a correspondingly impro... |
gr-qc/9511071 | null | Sunil D Maharaj, Peter GL Leach and Roy Maartens | Expanding Spherically Symmetric Models without Shear | 14 pages LaTeX, to appear General Relativity and Gravitation | Gen.Rel.Grav. 28 (1996) 35 | 10.1007/BF02106852 | RCG 94/7 | gr-qc | null | The integrability properties of the field equation $L_{xx} = F(x)L^2$ of a
spherically symmetric shear--free fluid are investigated. A first integral,
subject to an integrability condition on $F(x)$, is found, giving a new class
of solutions which contains the solutions of Stephani (1983) and Srivastava
(1987) as spe... | [
{
"created": "Mon, 27 Nov 1995 16:17:55 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Maharaj",
"Sunil D",
""
],
[
"Leach",
"Peter GL",
""
],
[
"Maartens",
"Roy",
""
]
] | The integrability properties of the field equation $L_{xx} = F(x)L^2$ of a spherically symmetric shear--free fluid are investigated. A first integral, subject to an integrability condition on $F(x)$, is found, giving a new class of solutions which contains the solutions of Stephani (1983) and Srivastava (1987) as speci... |
2108.05867 | Alan Cornell | Anele M Ncube, Gerhard E Harmsen and Alan S Cornell | Investigating a New Approach to Quasinormal Modes: Physics-Informed
Neural Networks | 6 pages, 2 figures, submitted to the South African Institute of
Physics 2021 conference proceedings | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Physics-informed neural networks (PINNs) hold the potential for supplementing
the existing set of techniques for solving differential equations that emerge
in the study of black hole quasinormal modes. The present research investigated
them by studying black hole perturbation equations with known analytical
solutions... | [
{
"created": "Thu, 12 Aug 2021 17:28:48 GMT",
"version": "v1"
}
] | 2021-08-13 | [
[
"Ncube",
"Anele M",
""
],
[
"Harmsen",
"Gerhard E",
""
],
[
"Cornell",
"Alan S",
""
]
] | Physics-informed neural networks (PINNs) hold the potential for supplementing the existing set of techniques for solving differential equations that emerge in the study of black hole quasinormal modes. The present research investigated them by studying black hole perturbation equations with known analytical solutions a... |
gr-qc/0005070 | Alicia M. Sintes | J. Carot, A.A. Coley, A.M. Sintes | Space-times admitting a three-dimensional conformal group | Latex 34 pages | Gen.Rel.Grav. 28 (1996) 311-337 | 10.1007/BF02106970 | null | gr-qc | null | Perfect fluid space-times admitting a three-dimensional Lie group of
conformal motions containing a two-dimensional Abelian Lie subgroup of
isometries are studied. Demanding that the conformal Killing vector be proper
(i.e., not homothetic nor Killing), all such space-times are classified
according to the structure o... | [
{
"created": "Tue, 16 May 2000 15:50:31 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Carot",
"J.",
""
],
[
"Coley",
"A. A.",
""
],
[
"Sintes",
"A. M.",
""
]
] | Perfect fluid space-times admitting a three-dimensional Lie group of conformal motions containing a two-dimensional Abelian Lie subgroup of isometries are studied. Demanding that the conformal Killing vector be proper (i.e., not homothetic nor Killing), all such space-times are classified according to the structure of ... |
gr-qc/0606012 | Yuan-Zhong Zhang | Kamal K. Nandi and Yuan-Zhong Zhang | An Algorithm for Generating Rotating Brans-Dicke Wormhole Solutions | 13 pages, no figure | null | null | null | gr-qc | null | Using the ansatz of Matos and N\'{u}\~{n}ez, the present article proposes an
algorithm for generating several classes, not all independent, of
asymptotically flat rotating wormhole solutions in the Brans-Dicke Theory. The
algorithm allows us to associate a real number}$n$ \textit{with} \textit{each
static and generat... | [
{
"created": "Fri, 2 Jun 2006 05:45:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Nandi",
"Kamal K.",
""
],
[
"Zhang",
"Yuan-Zhong",
""
]
] | Using the ansatz of Matos and N\'{u}\~{n}ez, the present article proposes an algorithm for generating several classes, not all independent, of asymptotically flat rotating wormhole solutions in the Brans-Dicke Theory. The algorithm allows us to associate a real number}$n$ \textit{with} \textit{each static and generated... |
1201.1756 | Alexander Zhuk | Maxim Eingorn and Alexander Zhuk | Remarks on gravitational interaction in Kaluza-Klein models | 13 pages, no figures. Reference and appendix added | Physics Letters B 713 (2012), pp. 154-159 | 10.1016/j.physletb.2012.06.029 | null | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In these remarks, we clarify the problematic aspects of gravitational
interaction in a weak-field limit of Kaluza-Klein models. We explain why some
models meet the classical gravitational tests, while others do not. We show
that variation of the total volume of the internal spaces generates the fifth
force. This is t... | [
{
"created": "Mon, 9 Jan 2012 13:46:32 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Jun 2012 09:40:04 GMT",
"version": "v2"
}
] | 2012-06-26 | [
[
"Eingorn",
"Maxim",
""
],
[
"Zhuk",
"Alexander",
""
]
] | In these remarks, we clarify the problematic aspects of gravitational interaction in a weak-field limit of Kaluza-Klein models. We explain why some models meet the classical gravitational tests, while others do not. We show that variation of the total volume of the internal spaces generates the fifth force. This is the... |
1008.3553 | Foek Hioe | F.T. Hioe and David Kuebel | Is a Circular Orbit Possible According to General Relativity? | 12 pages, no figures, no tables. In this version we consider a
broader parameter space for the orbits than in the original version | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new parameter space is used to classify circular orbits in the
Schwarzschild metric.
| [
{
"created": "Fri, 20 Aug 2010 18:44:18 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Aug 2010 20:39:05 GMT",
"version": "v2"
}
] | 2010-08-31 | [
[
"Hioe",
"F. T.",
""
],
[
"Kuebel",
"David",
""
]
] | A new parameter space is used to classify circular orbits in the Schwarzschild metric. |
2101.03398 | Michael K. -H. Kiessling | Parker Hund and Michael K.-H. Kiessling | Electrically non-neutral ground states of stars | 26 pages, 15 figures, to appear in Phys. Rev. D. This preprint is a
significant expansion (with its own new title) of about 2/3 of the 18 page
preprint arXiv:2008.04501v1 that was split into two pieces. The other 1/3 of
arXiv:2008.04501v1 was slightly expanded and became arXiv:2008.04501v2 (with
the original ti... | Physical Review D, vol. 103, art. 043004 (2021) | 10.1103/PhysRevD.103.043004 | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To approximately compute the non-relativistic ground state of an electrically
non-neutral star, an exactly solvable model was recently introduced, and partly
solved, by Krivoruchenko, Nadyozhin, and Yudin. The model generalizes the
well-known Lane--Emden equation of a polytropic gas ball of index $n=1$ to a
two-fluid... | [
{
"created": "Sat, 9 Jan 2021 17:26:14 GMT",
"version": "v1"
}
] | 2021-02-08 | [
[
"Hund",
"Parker",
""
],
[
"Kiessling",
"Michael K. -H.",
""
]
] | To approximately compute the non-relativistic ground state of an electrically non-neutral star, an exactly solvable model was recently introduced, and partly solved, by Krivoruchenko, Nadyozhin, and Yudin. The model generalizes the well-known Lane--Emden equation of a polytropic gas ball of index $n=1$ to a two-fluid s... |
gr-qc/9305022 | Robert Manuel Wald | Robert M. Wald | The First Law of Black Hole Mechanics | 9 pages, to appear in Misner Festschrift | null | null | null | gr-qc | null | A simple proof of a strengthened form of the first law of black hole
mechanics is presented. The proof is based directly upon the Hamiltonian
formulation of general relativity, and it shows that the the first law
variational formula holds for arbitrary nonsingular, asymptotically flat
perturbations of a stationary, a... | [
{
"created": "Tue, 25 May 1993 19:37:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wald",
"Robert M.",
""
]
] | A simple proof of a strengthened form of the first law of black hole mechanics is presented. The proof is based directly upon the Hamiltonian formulation of general relativity, and it shows that the the first law variational formula holds for arbitrary nonsingular, asymptotically flat perturbations of a stationary, axi... |
1006.4106 | Alan Kostelecky | Alan Kostelecky, Jay Tasson | Matter-gravity couplings and Lorentz violation | 59 pages two-column REVTeX | Phys.Rev.D83:016013,2011 | 10.1103/PhysRevD.83.016013 | IUHET 544, June 2010 | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitational couplings of matter are studied in the presence of Lorentz
and CPT violation. At leading order in the coefficients for Lorentz violation,
the relativistic quantum hamiltonian is derived from the gravitationally
coupled minimal Standard-Model Extension. For spin-independent effects, the
nonrelativist... | [
{
"created": "Mon, 21 Jun 2010 16:09:56 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Jan 2011 21:00:04 GMT",
"version": "v2"
}
] | 2011-02-25 | [
[
"Kostelecky",
"Alan",
""
],
[
"Tasson",
"Jay",
""
]
] | The gravitational couplings of matter are studied in the presence of Lorentz and CPT violation. At leading order in the coefficients for Lorentz violation, the relativistic quantum hamiltonian is derived from the gravitationally coupled minimal Standard-Model Extension. For spin-independent effects, the nonrelativistic... |
0803.4103 | Jiri Bicak | Jiri Bicak and Bernd G. Schmidt | Helical Symmetry in Linear Systems | 11 pages | Phys.Rev.D76:104040,2007 | 10.1103/PhysRevD.76.104040 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate properties of solutions of the scalar wave equation and
Maxwell's equations on Minkowski space with helical symmetry. Existence of
local and global solutions with this symmetry is demonstrated with and without
sources. The asymptotic properties of the solutions are analyzed. We show that
the Newman--Pe... | [
{
"created": "Fri, 28 Mar 2008 12:40:23 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bicak",
"Jiri",
""
],
[
"Schmidt",
"Bernd G.",
""
]
] | We investigate properties of solutions of the scalar wave equation and Maxwell's equations on Minkowski space with helical symmetry. Existence of local and global solutions with this symmetry is demonstrated with and without sources. The asymptotic properties of the solutions are analyzed. We show that the Newman--Penr... |
1910.06796 | Rudnei Ramos | Vahid Kamali, Meysam Motaharfar and Rudnei O. Ramos | Warm brane inflation with an exponential potential: A consistent
realization away from the swampland | 13 pages, 4 figures. Replaced with version matching the published one | Phys. Rev. D 101, 023535 (2020) | 10.1103/PhysRevD.101.023535 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has very recently been realized that coupling branes to higher dimensional
quantum gravity theories and considering the consistency of what lives on the
branes, one is able to understand whether such theories can belong either to
the swampland or to the landscape. In this regard, in the present work, we
study a wa... | [
{
"created": "Mon, 14 Oct 2019 17:42:50 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Feb 2020 23:08:54 GMT",
"version": "v2"
}
] | 2020-02-05 | [
[
"Kamali",
"Vahid",
""
],
[
"Motaharfar",
"Meysam",
""
],
[
"Ramos",
"Rudnei O.",
""
]
] | It has very recently been realized that coupling branes to higher dimensional quantum gravity theories and considering the consistency of what lives on the branes, one is able to understand whether such theories can belong either to the swampland or to the landscape. In this regard, in the present work, we study a warm... |
0709.3284 | Jorge Rocha | Jorge V. Rocha | Scaling solution for small cosmic string loops | 4 RevTeX4 pages, no figures | Phys.Rev.Lett.100:071601,2008 | 10.1103/PhysRevLett.100.071601 | null | gr-qc astro-ph | null | The equation governing the time evolution of the number density of loops in a
cosmic string network is a detailed balance determined by energy conservation.
We solve this equation with the inclusion of the gravitational radiation effect
which causes the loops to shrink (and eventually decay) as time elapses. The
solu... | [
{
"created": "Thu, 20 Sep 2007 19:28:43 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Rocha",
"Jorge V.",
""
]
] | The equation governing the time evolution of the number density of loops in a cosmic string network is a detailed balance determined by energy conservation. We solve this equation with the inclusion of the gravitational radiation effect which causes the loops to shrink (and eventually decay) as time elapses. The soluti... |
gr-qc/0503049 | Luis P. Chimento | Luis P. Chimento | Interacting fluids generating identical, dual and phantom cosmologies | 5 pages, revised version accepted for publication in PLB | Phys.Lett.B633:9-13,2006 | 10.1016/j.physletb.2005.11.027 | null | gr-qc | null | We find the group of symmetry transformations generated by interacting fluids
in spatially flat Friedmann-Robertson-Walker (FRW) spacetime which links
cosmologies with the same scale factor {\it (identity)} or with scale factors
$a$ and $a^{-1}$ {\it (duality)}. There exists a duality between contracting
and superacc... | [
{
"created": "Fri, 11 Mar 2005 10:07:58 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Nov 2005 23:45:52 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Chimento",
"Luis P.",
""
]
] | We find the group of symmetry transformations generated by interacting fluids in spatially flat Friedmann-Robertson-Walker (FRW) spacetime which links cosmologies with the same scale factor {\it (identity)} or with scale factors $a$ and $a^{-1}$ {\it (duality)}. There exists a duality between contracting and superaccel... |
1606.05342 | Peter Hess O | Peter O. Hess | The black hole merger event GW150914 within a modified theory of General
Relativity | null | null | 10.1093/mnras/stw1919 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In February 2016 the first observation of gravitational waves were reported.
The source of this event, denoted as GW150914, was identified as the merger of
two black holes with a about 30 solar masses each, at a distance of
approximately 400Mpc. These data where deduced using the Theory of General
Relativity. Since 2... | [
{
"created": "Thu, 16 Jun 2016 13:45:54 GMT",
"version": "v1"
}
] | 2016-08-17 | [
[
"Hess",
"Peter O.",
""
]
] | In February 2016 the first observation of gravitational waves were reported. The source of this event, denoted as GW150914, was identified as the merger of two black holes with a about 30 solar masses each, at a distance of approximately 400Mpc. These data where deduced using the Theory of General Relativity. Since 200... |
2404.16254 | Wei-Liang Qian | Kai Lin and Wei-Liang Qian | Standing wave in perturbed anti-de Sitter spacetimes with a naked
singularity | 15 pages and 8 figures | null | null | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of black hole perturbation theory, this work investigates
the standing wave solutions in Reissner-Nordtsr\"om (RN) anti-de Sitter (AdS)
spacetimes with a naked singularity. These solutions can be viewed as a
specific class of quasinormal modes exhibiting distinct characteristics. The
imaginary parts ... | [
{
"created": "Wed, 24 Apr 2024 23:53:48 GMT",
"version": "v1"
},
{
"created": "Fri, 10 May 2024 15:06:38 GMT",
"version": "v2"
}
] | 2024-05-13 | [
[
"Lin",
"Kai",
""
],
[
"Qian",
"Wei-Liang",
""
]
] | In the framework of black hole perturbation theory, this work investigates the standing wave solutions in Reissner-Nordtsr\"om (RN) anti-de Sitter (AdS) spacetimes with a naked singularity. These solutions can be viewed as a specific class of quasinormal modes exhibiting distinct characteristics. The imaginary parts of... |
1910.00669 | Oleg Zaslavskii | O. B. Zaslavskii | Redshift/blueshift inside the Schwarzschild black hole | 21 pages. Substantial revision. To appear in Gen. Rel. Grav | Gen. Relat. Grav. vol. 52 (2020) 37 | 10.1007/s10714-020-02688-w | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider an observer who moves under the horizon of the Schwarzschild
black hole and absorbs a photon. There are two different situations when (i) a
photon comes from infinity, (ii) it is emitted by another observer under the
horizon (say, by a surface of a collapsing star). We analyze the frequency
change for abs... | [
{
"created": "Tue, 1 Oct 2019 21:14:48 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Apr 2020 16:48:53 GMT",
"version": "v2"
}
] | 2020-04-22 | [
[
"Zaslavskii",
"O. B.",
""
]
] | We consider an observer who moves under the horizon of the Schwarzschild black hole and absorbs a photon. There are two different situations when (i) a photon comes from infinity, (ii) it is emitted by another observer under the horizon (say, by a surface of a collapsing star). We analyze the frequency change for absor... |
gr-qc/9803078 | I. Olasagasti | J. Ibanez, I. Olasagasti | On the evolution of a large class of inhomogeneous scalar field
cosmologies | 23 pages, 1 figure. Submitted to Classical and Quantum Gravity | Class.Quant.Grav. 15 (1998) 1937-1950 | 10.1088/0264-9381/15/7/011 | EHU-FT/9802 | gr-qc | null | The asymptotic behaviour of a family of inhomogeneous scalar field
cosmologies with exponential potential is studied. By introducing new variables
we can perform an almost complete analysis of the evolution of these
cosmologies. Unlike the homogeneous case (Bianchi type solutions), when k^2<2
the models do not isotro... | [
{
"created": "Tue, 24 Mar 1998 13:38:26 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Mar 1998 11:33:53 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Ibanez",
"J.",
""
],
[
"Olasagasti",
"I.",
""
]
] | The asymptotic behaviour of a family of inhomogeneous scalar field cosmologies with exponential potential is studied. By introducing new variables we can perform an almost complete analysis of the evolution of these cosmologies. Unlike the homogeneous case (Bianchi type solutions), when k^2<2 the models do not isotropi... |
1404.4044 | Andrei Lebed G | Andrei G. Lebed | Breakdown of the equivalence between gravitational mass and energy for a
composite quantum body | 4 pages, no figures. arXiv admin note: substantial text overlap with
arXiv:1404.3765 | Journal of Physics: Conference Series, vol. 490, 012154 (2014) | 10.1088/1742-6596/490/1/012154 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The simplest quantum composite body, a hydrogen atom, is considered in the
presence of a weak external gravitational field. We define an operator for the
passive gravitational mass of the atom in the post-Newtonian approximation of
the general relativity and show that it does not commute with its energy
operator. Nev... | [
{
"created": "Mon, 14 Apr 2014 22:18:11 GMT",
"version": "v1"
}
] | 2014-04-17 | [
[
"Lebed",
"Andrei G.",
""
]
] | The simplest quantum composite body, a hydrogen atom, is considered in the presence of a weak external gravitational field. We define an operator for the passive gravitational mass of the atom in the post-Newtonian approximation of the general relativity and show that it does not commute with its energy operator. Never... |
1112.4997 | Emilio Santos Corchero | Emilio Santos | Can modified gravity prevent the gravitational collapse to black hole? | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that the theoretical arguments for the unavoidable collapse of
massive stars, which are valid within standard general relativity, are not
valid in extended gravity. In particular a calculation is reported of neutron
stars within a theory obtained from an Einstein-Hilbert action involving a
function of $R^... | [
{
"created": "Wed, 21 Dec 2011 11:50:37 GMT",
"version": "v1"
}
] | 2011-12-22 | [
[
"Santos",
"Emilio",
""
]
] | It is shown that the theoretical arguments for the unavoidable collapse of massive stars, which are valid within standard general relativity, are not valid in extended gravity. In particular a calculation is reported of neutron stars within a theory obtained from an Einstein-Hilbert action involving a function of $R^{2... |
2301.04547 | Mauro Carfora | Mauro Carfora and Francesca Familiari | A Scale-Dependent Distance Functional between Past Light Cones in
Cosmology | 32 pages, This article belongs to the special issue of Universe
"Cosmological Perturbations in Early and Late Cosmology" in honor of Maurizio
Gasperini on the Occasion of his 70th birthday | Universe 2023, 9, 25 | 10.3390/universe9010025 | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | We discuss a rigorous procedure for quantifying the difference between our
past lightcone and the past lightcone of the fiducial
Friedmann-Lemaitre-Robertson-Walker spacetime modeling the large-scale
description of cosmological data in the standard $\Lambda\mathrm{CDM}$
scenario. This result is made possible by explo... | [
{
"created": "Wed, 11 Jan 2023 16:17:59 GMT",
"version": "v1"
}
] | 2023-01-12 | [
[
"Carfora",
"Mauro",
""
],
[
"Familiari",
"Francesca",
""
]
] | We discuss a rigorous procedure for quantifying the difference between our past lightcone and the past lightcone of the fiducial Friedmann-Lemaitre-Robertson-Walker spacetime modeling the large-scale description of cosmological data in the standard $\Lambda\mathrm{CDM}$ scenario. This result is made possible by exploit... |
gr-qc/0612095 | Riccardo Benini | Riccardo Benini, Giovanni Montani | Inhomogeneous Quantum Mixmaster: from Classical toward Quantum Mechanics | 17 pages, 6 figures, to appear on Classical and Quantum Gravity PACS:
04.20.Jb, 98.80.Dr, 83C | Class.Quant.Grav.24:387-404,2007 | 10.1088/0264-9381/24/2/007 | null | gr-qc | null | Starting from the Hamiltonian formulation for the inhomogeneous Mixmaster
dynam- ics, we approach its quantum features through the link of the
quasi-classical limit. We fix the proper operator-ordering which ensures that
the WKB continuity equation overlaps the Liouville theorem as restricted to the
configuration spa... | [
{
"created": "Fri, 15 Dec 2006 15:27:53 GMT",
"version": "v1"
}
] | 2011-02-19 | [
[
"Benini",
"Riccardo",
""
],
[
"Montani",
"Giovanni",
""
]
] | Starting from the Hamiltonian formulation for the inhomogeneous Mixmaster dynam- ics, we approach its quantum features through the link of the quasi-classical limit. We fix the proper operator-ordering which ensures that the WKB continuity equation overlaps the Liouville theorem as restricted to the configuration space... |
1711.06700 | Dominic Dold | Dominic Dold | Global dynamics of asymptotically locally AdS spacetimes with negative
mass | 24 pages, 6 figures | null | 10.1088/1361-6382/aab62e | null | gr-qc hep-th math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Einstein vacuum equations in five dimensions with negative cosmological
constant are studied in biaxial Bianchi IX symmetry. We show that if initial
data of Eguchi-Hanson type, modelled after the four-dimensional Riemannian
Eguchi-Hanson space, have negative mass, the future maximal development does
not contain h... | [
{
"created": "Fri, 17 Nov 2017 19:25:46 GMT",
"version": "v1"
}
] | 2018-04-18 | [
[
"Dold",
"Dominic",
""
]
] | The Einstein vacuum equations in five dimensions with negative cosmological constant are studied in biaxial Bianchi IX symmetry. We show that if initial data of Eguchi-Hanson type, modelled after the four-dimensional Riemannian Eguchi-Hanson space, have negative mass, the future maximal development does not contain hor... |
2110.13866 | M. B. Paranjape | R\'emi Ligez, R. B. MacKenzie, Victor Massart, M. B. Paranjape and U.
A. Yajnik | What is the Gravitational Field of a Mass in a Spatially Nonlocal
Quantum Superposition? | 6 pages, 1 figure | null | null | UdeM-GPP-TH-21-291 | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | The study of the gravitational field produced by a spatially non-local,
superposed quantum state of a massive particle is a thrilling area of modern
physics. One question to be answered is whether the gravitational field behaves
as the classical superposition of two particles separated by a spatial distance
with half... | [
{
"created": "Tue, 26 Oct 2021 17:18:35 GMT",
"version": "v1"
}
] | 2021-10-28 | [
[
"Ligez",
"Rémi",
""
],
[
"MacKenzie",
"R. B.",
""
],
[
"Massart",
"Victor",
""
],
[
"Paranjape",
"M. B.",
""
],
[
"Yajnik",
"U. A.",
""
]
] | The study of the gravitational field produced by a spatially non-local, superposed quantum state of a massive particle is a thrilling area of modern physics. One question to be answered is whether the gravitational field behaves as the classical superposition of two particles separated by a spatial distance with half t... |
gr-qc/9806095 | Zoltan Perjes | Zolt\'an Perj\'es, Gyula Fodor, L\'aszl\'o \'A. Gergely and Mattias
Marklund | A rotating incompressible perfect fluid space-time | references added | null | null | null | gr-qc | null | A rigidly rotating incompressible perfect fluid solution of Einstein's
gravitational equations is discussed. The Petrov type is D, and the metric
admits a four-parameter isometry group. The Gaussian curvature of the
constant-pressure surfaces is positive and they have two ring-shaped cusps.
| [
{
"created": "Wed, 24 Jun 1998 16:49:36 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jul 1998 09:03:52 GMT",
"version": "v2"
},
{
"created": "Thu, 3 Dec 1998 13:30:38 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Perjés",
"Zoltán",
""
],
[
"Fodor",
"Gyula",
""
],
[
"Gergely",
"László Á.",
""
],
[
"Marklund",
"Mattias",
""
]
] | A rigidly rotating incompressible perfect fluid solution of Einstein's gravitational equations is discussed. The Petrov type is D, and the metric admits a four-parameter isometry group. The Gaussian curvature of the constant-pressure surfaces is positive and they have two ring-shaped cusps. |
1211.4183 | Xiangdong Zhang | Xiangdong Zhang, Michal Artymowski, Yongge Ma | Loop quantum Brans-Dicke cosmology | 13 pages, second version | Phys. Rev. D 87, 084024 (2013) | 10.1103/PhysRevD.87.084024 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spatially flat and isotropic cosmological model of Brans-Dicke theory
with coupling parameter $\omega\neq-3/2$ is quantized by the approach of loop
quantum cosmology. An interesting feature of this model is that, although the
Brans-Dicke scalar field is non-minimally coupled with curvature, it can still
play the ... | [
{
"created": "Sun, 18 Nov 2012 02:02:06 GMT",
"version": "v1"
},
{
"created": "Sat, 13 Apr 2013 10:19:38 GMT",
"version": "v2"
}
] | 2013-04-16 | [
[
"Zhang",
"Xiangdong",
""
],
[
"Artymowski",
"Michal",
""
],
[
"Ma",
"Yongge",
""
]
] | The spatially flat and isotropic cosmological model of Brans-Dicke theory with coupling parameter $\omega\neq-3/2$ is quantized by the approach of loop quantum cosmology. An interesting feature of this model is that, although the Brans-Dicke scalar field is non-minimally coupled with curvature, it can still play the ro... |
1710.08753 | Angelo Ricciardone | Daniel M\"uller, Angelo Ricciardone, Alexei A. Starobinsky, Aleksey
Toporensky | Anisotropic cosmological solutions in $R + R^2$ gravity | 13 pages, 2 figures | null | 10.1140/epjc/s10052-018-5778-0 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we investigate the past evolution of an anisotropic Bianchi I
universe in $R+R^2$ gravity. Using the dynamical system approach we show that
there exists a new two-parameters set of solutions that includes both an
isotropic "false radiation" solution and an anisotropic generalized Kasner
solution, which ... | [
{
"created": "Tue, 24 Oct 2017 13:19:22 GMT",
"version": "v1"
}
] | 2018-05-09 | [
[
"Müller",
"Daniel",
""
],
[
"Ricciardone",
"Angelo",
""
],
[
"Starobinsky",
"Alexei A.",
""
],
[
"Toporensky",
"Aleksey",
""
]
] | In this paper we investigate the past evolution of an anisotropic Bianchi I universe in $R+R^2$ gravity. Using the dynamical system approach we show that there exists a new two-parameters set of solutions that includes both an isotropic "false radiation" solution and an anisotropic generalized Kasner solution, which is... |
1402.3589 | Rafael Sorkin | Rafael D. Sorkin | 1983 paper on entanglement entropy: "On the Entropy of the Vacuum
outside a Horizon" | This is a verbatim copy of a paper published originally in 1983,
before the existence of "arXiv". Also available at
http://www.pitp.ca/personal/rsorkin/some.papers/31.padova.entropy.pdf | Tenth International Conference on General Relativity and
Gravitation (held Padova, 4-9 July, 1983), Contributed Papers, vol. II, pp.
734-736 | null | null | gr-qc cond-mat.stat-mech hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I introduce the concept of *entanglement entropy* (as it's now called) and
point out that it follows an *area law* which renders it a suitable source of
black hole entropy. I also suggest to conceive the latter as residing on the
horizon at approximately one bit per "Planckian plaquette".
| [
{
"created": "Sat, 15 Feb 2014 01:41:10 GMT",
"version": "v1"
}
] | 2014-02-18 | [
[
"Sorkin",
"Rafael D.",
""
]
] | I introduce the concept of *entanglement entropy* (as it's now called) and point out that it follows an *area law* which renders it a suitable source of black hole entropy. I also suggest to conceive the latter as residing on the horizon at approximately one bit per "Planckian plaquette". |
gr-qc/0212114 | Yoshiaki Himemoto | Yoshiaki Himemoto, Takahiro Tanaka | Braneworld reheating in the bulk inflaton model | 5 pages, no figures, final version to be published in PRD | Phys.Rev. D67 (2003) 084014 | 10.1103/PhysRevD.67.084014 | null | gr-qc astro-ph hep-ph hep-th | null | In the context of the braneworld inflation driven by a bulk scalar field, we
study the energy dissipation from the bulk scalar field into the matter on the
brane in order to understand the reheating after inflation. Deriving the
late-time behavior of the bulk field with dissipation by using the Green's
function metho... | [
{
"created": "Fri, 27 Dec 2002 11:35:39 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Mar 2003 08:47:51 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Himemoto",
"Yoshiaki",
""
],
[
"Tanaka",
"Takahiro",
""
]
] | In the context of the braneworld inflation driven by a bulk scalar field, we study the energy dissipation from the bulk scalar field into the matter on the brane in order to understand the reheating after inflation. Deriving the late-time behavior of the bulk field with dissipation by using the Green's function method,... |
gr-qc/0411016 | James Shifflett | J. A. Shifflett | Lambda-renormalized Einstein-Schrodinger theory with spin-0 and spin-1/2
sources | 30 pages, latex2e, many changes, some new material, changed to
geometrized units | null | null | null | gr-qc | null | The Einstein-Schrodinger theory is extended to include spin-0 and spin-1/2
sources, and the theory is derived from a Lagrangian density which allows other
fields to be easily added. The original theory is also modified by including a
cosmological constant caused by zero-point fluctuations. This cosmological
constant ... | [
{
"created": "Tue, 2 Nov 2004 04:20:16 GMT",
"version": "v1"
},
{
"created": "Tue, 3 May 2005 17:47:26 GMT",
"version": "v2"
},
{
"created": "Mon, 5 Jun 2006 04:42:26 GMT",
"version": "v3"
},
{
"created": "Fri, 13 Apr 2007 16:17:35 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"Shifflett",
"J. A.",
""
]
] | The Einstein-Schrodinger theory is extended to include spin-0 and spin-1/2 sources, and the theory is derived from a Lagrangian density which allows other fields to be easily added. The original theory is also modified by including a cosmological constant caused by zero-point fluctuations. This cosmological constant wh... |
1802.09573 | Jens Boos | Jens Boos, Valeri P. Frolov, and Andrei Zelnikov | The gravitational field of static p-branes in linearized ghost-free
gravity | 11 pages, 4 figures, matches the published version | Phys. Rev. D 97, 084021 (2018) | 10.1103/PhysRevD.97.084021 | Alberta-Thy-02-18 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the gravitational field of static p-branes in D-dimensional
Minkowski space in the framework of linearized ghost-free (GF) gravity. The
concrete models of GF gravity we consider are parametrized by the non-local
form factors $\exp(-\Box/\mu^2)$ and $\exp(\Box^2/\mu^4)$, where $\mu^{-1}$ is
the scale of non-l... | [
{
"created": "Mon, 26 Feb 2018 19:57:13 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Apr 2018 22:45:43 GMT",
"version": "v2"
}
] | 2018-04-18 | [
[
"Boos",
"Jens",
""
],
[
"Frolov",
"Valeri P.",
""
],
[
"Zelnikov",
"Andrei",
""
]
] | We study the gravitational field of static p-branes in D-dimensional Minkowski space in the framework of linearized ghost-free (GF) gravity. The concrete models of GF gravity we consider are parametrized by the non-local form factors $\exp(-\Box/\mu^2)$ and $\exp(\Box^2/\mu^4)$, where $\mu^{-1}$ is the scale of non-loc... |
0707.0847 | Richard Woodard | T. Prokopec (Utrecht), N. C. Tsamis (Crete) and R. P. Woodard
(Florida) | Stochastic Inflationary Scalar Electrodynamics | 52 pages, 7 figures, uses LaTeX 2epsilon, version 2 corrects eqn
(138) and updates the reference list | AnnalsPhys.323:1324-1360,2008 | 10.1016/j.aop.2007.08.008 | UFIFT-QG-06-05 | gr-qc astro-ph hep-ph | null | We stochastically formulate the theory of scalar quantum electrodynamics on a
de Sitter background. This reproduces the leading infrared logarithms at each
loop order. It also allows one to sum the series of leading infrared logarithms
to obtain explicit, nonperturbative results about the late time behavior of the
sy... | [
{
"created": "Thu, 5 Jul 2007 18:08:56 GMT",
"version": "v1"
},
{
"created": "Sun, 11 May 2008 15:54:34 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Prokopec",
"T.",
"",
"Utrecht"
],
[
"Tsamis",
"N. C.",
"",
"Crete"
],
[
"Woodard",
"R. P.",
"",
"Florida"
]
] | We stochastically formulate the theory of scalar quantum electrodynamics on a de Sitter background. This reproduces the leading infrared logarithms at each loop order. It also allows one to sum the series of leading infrared logarithms to obtain explicit, nonperturbative results about the late time behavior of the syst... |
gr-qc/0508087 | Dr. Anirudh Pradhan | Anirudh Pradhan, Vandana Rai and Saeed Otarod | Plane symmetric inhomogeneous bulk viscous domain wall in Lyra geometry | 16 pages, no figure. Fizika B, to be published | Fizika B15:57-70,2006 | null | null | gr-qc | null | Some bulk viscous general solutions are found for domain walls in Lyra
geometry in the plane symmetric inhomogeneous spacetime. Expressions for the
energy density and pressure of domain walls are derived in both cases of
uniform and time varying displacement field $\beta$. The viscosity coefficient
of bulk viscous fl... | [
{
"created": "Sat, 20 Aug 2005 15:48:45 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Dec 2005 13:42:30 GMT",
"version": "v2"
},
{
"created": "Fri, 21 Jul 2006 07:20:16 GMT",
"version": "v3"
}
] | 2010-11-26 | [
[
"Pradhan",
"Anirudh",
""
],
[
"Rai",
"Vandana",
""
],
[
"Otarod",
"Saeed",
""
]
] | Some bulk viscous general solutions are found for domain walls in Lyra geometry in the plane symmetric inhomogeneous spacetime. Expressions for the energy density and pressure of domain walls are derived in both cases of uniform and time varying displacement field $\beta$. The viscosity coefficient of bulk viscous flui... |
0903.5160 | Helmut Friedrich | Helmut Friedrich | Initial boundary value problems for Einstein's field equations and
geometric uniqueness | 19 pages | Gen.Rel.Grav.41:1947-1966,2009 | 10.1007/s10714-009-0800-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | While there exist now formulations of initial boundary value problems for
Einstein's field equations which are well posed and preserve constraints and
gauge conditions, the question of geometric uniqueness remains unresolved. For
two different approaches we discuss how this difficulty arises under general
assumptions... | [
{
"created": "Mon, 30 Mar 2009 09:20:55 GMT",
"version": "v1"
}
] | 2009-09-28 | [
[
"Friedrich",
"Helmut",
""
]
] | While there exist now formulations of initial boundary value problems for Einstein's field equations which are well posed and preserve constraints and gauge conditions, the question of geometric uniqueness remains unresolved. For two different approaches we discuss how this difficulty arises under general assumptions. ... |
gr-qc/9403031 | null | M. Gasperini and G. Veneziano | Dilaton Production in String Cosmology | 49 pages, plain tex, 2 figures (available on request),
CERN-TH.7178/94 | Phys.Rev. D50 (1994) 2519-2540 | 10.1103/PhysRevD.50.2519 | null | gr-qc astro-ph hep-th | null | We consider the coupled evolution of density, (scalar) metric and dilaton
perturbations in the transition from a ``stringy" phase of growing curvature
and gravitational coupling to the standard radiation-dominated cosmology. We
show that dilaton production, with a spectrum tilted towards large frequencies,
emerges as... | [
{
"created": "Wed, 16 Mar 1994 17:19:43 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Gasperini",
"M.",
""
],
[
"Veneziano",
"G.",
""
]
] | We consider the coupled evolution of density, (scalar) metric and dilaton perturbations in the transition from a ``stringy" phase of growing curvature and gravitational coupling to the standard radiation-dominated cosmology. We show that dilaton production, with a spectrum tilted towards large frequencies, emerges as a... |
1108.0227 | Rong-Jia Yang | Rong-Jia Yang | Asymptotically safe phantom cosmology | 7 pages | Eur. Phys. J. C (2012) 72:1948 | 10.1140/epjc/s10052-012-1948-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider quantum modifications to phantom cosmology in a
Friedmann-Robertson-Walker spacetime. The cosmological evolution equations
improved by the renormalization group are obtained. For exponential potential,
we find two types of cosmological fixed point; the renormalization group scale
either freezes in, or con... | [
{
"created": "Mon, 1 Aug 2011 03:52:46 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Mar 2012 14:38:33 GMT",
"version": "v2"
}
] | 2012-03-20 | [
[
"Yang",
"Rong-Jia",
""
]
] | We consider quantum modifications to phantom cosmology in a Friedmann-Robertson-Walker spacetime. The cosmological evolution equations improved by the renormalization group are obtained. For exponential potential, we find two types of cosmological fixed point; the renormalization group scale either freezes in, or conti... |
gr-qc/0507136 | Filimonova Irina V | V.A.Petrov | Einstein, Hilbert and Equations of Gravitation | Plenary talk presented at Workshop on High Energy Physics&Field
Theory (Protvino, Russia, 2004) | null | null | HEPFT/2004/17 | gr-qc | null | Some highlights of the priority in the discovery of the gravitational field
equations are given.
| [
{
"created": "Fri, 29 Jul 2005 10:12:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Petrov",
"V. A.",
""
]
] | Some highlights of the priority in the discovery of the gravitational field equations are given. |
gr-qc/0603047 | Mihai Bondarescu | Mihai Bondarescu | Orbifolds in Numerical Relativity | 11 pages; references added | null | null | null | gr-qc | null | Numerical Relativity has been using orbifolds for a long time, although they
appear under different names in the literature. We review orbifolds previously
used in simulations also discuss some that have not been used yet but are
likely to be useful in the future.
| [
{
"created": "Mon, 13 Mar 2006 10:33:09 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Apr 2006 22:57:43 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Apr 2006 07:27:27 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Bondarescu",
"Mihai",
""
]
] | Numerical Relativity has been using orbifolds for a long time, although they appear under different names in the literature. We review orbifolds previously used in simulations also discuss some that have not been used yet but are likely to be useful in the future. |
gr-qc/0011068 | Guillermo A. Mena Marugan | Guillermo A. Mena Marugan (CSIC, Madrid, Spain) | Gauge fixing and the Hamiltonian for cylindrical spacetimes | 12 pages, accepted for publication in Physical Review D | Phys.Rev. D63 (2001) 024005 | 10.1103/PhysRevD.63.024005 | null | gr-qc | null | We introduce a complete gauge fixing for cylindrical spacetimes in vacuo
that, in principle, do not contain the axis of symmetry. By cylindrically
symmetric we understand spacetimes that possess two commuting spacelike Killing
vectors, one of them rotational and the other one translational. The result of
our gauge fi... | [
{
"created": "Mon, 20 Nov 2000 15:55:47 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Marugan",
"Guillermo A. Mena",
"",
"CSIC, Madrid, Spain"
]
] | We introduce a complete gauge fixing for cylindrical spacetimes in vacuo that, in principle, do not contain the axis of symmetry. By cylindrically symmetric we understand spacetimes that possess two commuting spacelike Killing vectors, one of them rotational and the other one translational. The result of our gauge fixi... |
2110.03005 | Alexander B. Balakin | Alexander B. Balakin, Vladimir V. Bochkarev and Albina F. Nizamieva | Nonlinear axion electrodynamics: Axionically induced electric flares in
the early magnetized universe | 14 pages, 10 figures | Symmetry, 2021, 13, 2038 | 10.3390/sym13112038 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the nonlinearly extended Einstein-Maxwell-axion theory, which is
based on the account for two symmetries: first, the discrete symmetry
associated with the properties of the axion field, second, the Jackson's
symmetry, prescribing to the electrodynamics to be invariant with respect to
the rotation in the p... | [
{
"created": "Wed, 6 Oct 2021 18:25:49 GMT",
"version": "v1"
}
] | 2021-11-02 | [
[
"Balakin",
"Alexander B.",
""
],
[
"Bochkarev",
"Vladimir V.",
""
],
[
"Nizamieva",
"Albina F.",
""
]
] | We consider the nonlinearly extended Einstein-Maxwell-axion theory, which is based on the account for two symmetries: first, the discrete symmetry associated with the properties of the axion field, second, the Jackson's symmetry, prescribing to the electrodynamics to be invariant with respect to the rotation in the pla... |
2112.05789 | Sanasam Surendra Singh | Md. Khurshid Alam, S. Surendra Singh and L. Anjana Devi | Interaction of Anisotropic Dark Energy with Generalized Hybrid Expansion
Law | 12 pages, 10 figures. Manuscript has been accepted for publication in
Advances in High Energy Physics | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Interaction of dark energy in the anisotropic Locally Rotationally Symmetric
(LRS) Bianchi type-I metric is investigated in the context of modified f(R,T)
theory of gravity, where R is the Ricci scalar and T is the trace of stress
energy momentum tensor. We choose the particular form of the functional
f(R,T)=f_1 (R,T... | [
{
"created": "Fri, 10 Dec 2021 19:20:00 GMT",
"version": "v1"
}
] | 2021-12-22 | [
[
"Alam",
"Md. Khurshid",
""
],
[
"Singh",
"S. Surendra",
""
],
[
"Devi",
"L. Anjana",
""
]
] | Interaction of dark energy in the anisotropic Locally Rotationally Symmetric (LRS) Bianchi type-I metric is investigated in the context of modified f(R,T) theory of gravity, where R is the Ricci scalar and T is the trace of stress energy momentum tensor. We choose the particular form of the functional f(R,T)=f_1 (R,T)+... |
1301.1009 | Diego Rubiera-Garcia | J. Diaz-Alonso and D. Rubiera-Garcia | Black holes from generalized gauge field theories | 8 pages, 2 figures, contribution to NED14 Proceedings | J.Phys.Conf.Ser. 283 (2011) 012014 | 10.1088/1742-6596/283/1/012014 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We summarize the main results of a broad analysis on electrostatic,
spherically symmetric (ESS) solutions of a class of non-linear electrodynamics
models minimally coupled to gravitation. Such models are defined as arbitrary
functions of the two quadratic field invariants, constrained by several
physical admissibilit... | [
{
"created": "Sun, 6 Jan 2013 14:31:51 GMT",
"version": "v1"
}
] | 2013-01-08 | [
[
"Diaz-Alonso",
"J.",
""
],
[
"Rubiera-Garcia",
"D.",
""
]
] | We summarize the main results of a broad analysis on electrostatic, spherically symmetric (ESS) solutions of a class of non-linear electrodynamics models minimally coupled to gravitation. Such models are defined as arbitrary functions of the two quadratic field invariants, constrained by several physical admissibility ... |
0803.0669 | Ulf Leonhardt | Ulf Leonhardt and Thomas G. Philbin | Black Hole Lasers Revisited | 16 pages | Contribution to "Quantum Analogues: From Phase Transitions to
Black Holes and Cosmology" edited by William G. Unruh and Ralf Schutzhold
(Springer, Berlin, 2007) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The production of Hawking radiation by a single horizon is not dependent on
the high-frequency dispersion relation of the radiated field. When there are
two horizons, however, Corley and Jacobson have shown that superluminal
dispersion leads to an amplification of the particle production in the case of
bosons. The an... | [
{
"created": "Wed, 5 Mar 2008 14:16:23 GMT",
"version": "v1"
}
] | 2008-03-06 | [
[
"Leonhardt",
"Ulf",
""
],
[
"Philbin",
"Thomas G.",
""
]
] | The production of Hawking radiation by a single horizon is not dependent on the high-frequency dispersion relation of the radiated field. When there are two horizons, however, Corley and Jacobson have shown that superluminal dispersion leads to an amplification of the particle production in the case of bosons. The anal... |
1401.4548 | Piotr Jaranowski | Thibault Damour, Piotr Jaranowski, and Gerhard Sch\"afer | Nonlocal-in-time action for the fourth post-Newtonian conservative
dynamics of two-body systems | Minor amendments added; misprints removed; identical with published
version. 18 pages | Phys. Rev. D 89, 064058 (2014) | 10.1103/PhysRevD.89.064058 | null | gr-qc astro-ph.HE hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We complete the analytical determination, at the 4th post-Newtonian (4PN)
approximation, of the conservative dynamics of gravitationally interacting
two-point-mass systems. This completion is obtained by resolving the infra-red
ambiguity which had blocked a previous 4PN calculation [P.Jaranowski and
G.Sch\"afer, Phys... | [
{
"created": "Sat, 18 Jan 2014 15:39:20 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Mar 2014 16:27:21 GMT",
"version": "v2"
}
] | 2014-04-02 | [
[
"Damour",
"Thibault",
""
],
[
"Jaranowski",
"Piotr",
""
],
[
"Schäfer",
"Gerhard",
""
]
] | We complete the analytical determination, at the 4th post-Newtonian (4PN) approximation, of the conservative dynamics of gravitationally interacting two-point-mass systems. This completion is obtained by resolving the infra-red ambiguity which had blocked a previous 4PN calculation [P.Jaranowski and G.Sch\"afer, Phys. ... |
1802.03833 | Sujoy Modak | Sujoy K. Modak | New geometric and field theoretic aspects of a radiation dominated
universe | v2, 22 pages (important inclusion of the discussion on non-static
observers in the new spacetime who encounter horizon due to their motion -
qualitatively similar to Rindler observers in Minkowski spacetime); v3, 23
pages, matches published version in PRD | Phys. Rev. D 97, 105016 (2018) | 10.1103/PhysRevD.97.105016 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The homogeneous and isotropic radiation dominated universe, following the
inflationary stage, is expressed as a spherically symmetric and inhomogeneous
spacetime upon a power law type conformal transformation of the null
(cosmological) coordinates. This new spacetime metric has many interesting
properties. While the ... | [
{
"created": "Sun, 11 Feb 2018 22:42:03 GMT",
"version": "v1"
},
{
"created": "Sun, 8 Apr 2018 02:04:24 GMT",
"version": "v2"
},
{
"created": "Tue, 22 May 2018 23:00:29 GMT",
"version": "v3"
}
] | 2018-05-24 | [
[
"Modak",
"Sujoy K.",
""
]
] | The homogeneous and isotropic radiation dominated universe, following the inflationary stage, is expressed as a spherically symmetric and inhomogeneous spacetime upon a power law type conformal transformation of the null (cosmological) coordinates. This new spacetime metric has many interesting properties. While the st... |
1506.03342 | Chad Middleton | Chad A. Middleton | The 2D surfaces that generate Newtonian and general relativistic orbits
with small eccentricities | 16 pages, 3 figures, accepted for publication in the American Journal
of Physics | null | null | null | gr-qc physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Embedding diagrams prove to be quite useful when learning general relativity
as they offer a way of visualizing spacetime curvature through warped two
dimensional (2D) surfaces. In this manuscript we present a different 2D
construct that also serves as a useful conceptual tool for gaining insight into
gravitation, in... | [
{
"created": "Tue, 9 Jun 2015 16:15:34 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Middleton",
"Chad A.",
""
]
] | Embedding diagrams prove to be quite useful when learning general relativity as they offer a way of visualizing spacetime curvature through warped two dimensional (2D) surfaces. In this manuscript we present a different 2D construct that also serves as a useful conceptual tool for gaining insight into gravitation, in p... |
1506.04023 | Ramil Izmailov | Ramil Izmailov, Alexander A. Potapov, Alexander I. Filippov, Mithun
Ghosh and Kamal K. Nandi | Upper Limit on the Central Density of Dark Matter in the Eddington
inspired Born-Infield (EiBI) Gravity | 12 pages, 3 figures. arXiv admin note: substantial text overlap with
arXiv:1412.7897 | Modern Physics Letters A, Vol. 30, No. 11 1550056 (2015) | 10.1142/S021773231550056X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the stability of circular material orbits in the analytic
galactic metric recently derived by Harko \textit{et al.} (2014). It turnsout
that stability depends more strongly on the dark matter central density
$%\rho_{0}$ than on other parameters of the solution. This property then yields
an upper limit ... | [
{
"created": "Thu, 11 Jun 2015 06:59:26 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Izmailov",
"Ramil",
""
],
[
"Potapov",
"Alexander A.",
""
],
[
"Filippov",
"Alexander I.",
""
],
[
"Ghosh",
"Mithun",
""
],
[
"Nandi",
"Kamal K.",
""
]
] | We investigate the stability of circular material orbits in the analytic galactic metric recently derived by Harko \textit{et al.} (2014). It turnsout that stability depends more strongly on the dark matter central density $%\rho_{0}$ than on other parameters of the solution. This property then yields an upper limit on... |
1108.0910 | Lee Smolin | Lee Smolin | The black hole information paradox and relative locality | 11 pages, one figure | Phys. Rev. D 90, 024074 (2014) | 10.1103/PhysRevD.90.024074 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that the recently proposed principle of relative locality offers a
new way to resolve the black hole information puzzle.
| [
{
"created": "Wed, 3 Aug 2011 18:41:35 GMT",
"version": "v1"
}
] | 2014-08-06 | [
[
"Smolin",
"Lee",
""
]
] | We argue that the recently proposed principle of relative locality offers a new way to resolve the black hole information puzzle. |
gr-qc/0209018 | Helmut Friedrich | Helmut Friedrich | Conformal Einstein evolution | To appear in: J. Frauendiener, H. Friedrich (eds.), ``The Conformal
Structure of Spacetime: Geometry, Analysis, Numerics'', Springer, Lecture
Notes in Physics, Berlin, 2002 | Lect.Notes Phys. 604 (2002) 1-50 | null | null | gr-qc | null | We discuss various properties of the conformal field equations and their
consequences for the asymptotic structure of space-times.
| [
{
"created": "Fri, 6 Sep 2002 12:42:49 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Friedrich",
"Helmut",
""
]
] | We discuss various properties of the conformal field equations and their consequences for the asymptotic structure of space-times. |
1206.4553 | David Schroeren Mr | David P.B. Schroeren | Decoherent Histories of Spin Networks | Published version | Foundations of Physics, March 2013, Volume 43, Issue 3, pp 310-328 | 10.1007/s10701-013-9698-4 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The decoherent histories formalism, developed by Griffiths, Gell-Mann, and
Hartle is a general framework in which to formulate a timeless, `generalised'
quantum theory and extract predictions from it. Recent advances in spin foam
models allow for loop gravity to be cast in this framework. In this paper, I
propose a d... | [
{
"created": "Wed, 20 Jun 2012 16:48:34 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Jan 2013 16:47:53 GMT",
"version": "v2"
}
] | 2013-02-08 | [
[
"Schroeren",
"David P. B.",
""
]
] | The decoherent histories formalism, developed by Griffiths, Gell-Mann, and Hartle is a general framework in which to formulate a timeless, `generalised' quantum theory and extract predictions from it. Recent advances in spin foam models allow for loop gravity to be cast in this framework. In this paper, I propose a dec... |
1604.02643 | Cosimo Bambi | Cosimo Bambi, Sourabh Nampalliwar | Quasi-periodic oscillations as a tool for testing the Kerr metric: A
comparison with gravitational waves and iron line | 6 pages, 2 figures. v2: refereed version | Europhys.Lett. 116: 30006, 2016 | 10.1209/0295-5075/116/30006 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | QPOs are a common feature in the X-ray power density spectrum of black hole
binaries and a potentially powerful tool to probe the spacetime geometry around
these objects. Here we discuss their constraining power to test the Kerr black
hole hypothesis within the relativistic precession model. We compare our
results wi... | [
{
"created": "Sun, 10 Apr 2016 06:36:40 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Dec 2016 19:56:35 GMT",
"version": "v2"
}
] | 2016-12-22 | [
[
"Bambi",
"Cosimo",
""
],
[
"Nampalliwar",
"Sourabh",
""
]
] | QPOs are a common feature in the X-ray power density spectrum of black hole binaries and a potentially powerful tool to probe the spacetime geometry around these objects. Here we discuss their constraining power to test the Kerr black hole hypothesis within the relativistic precession model. We compare our results with... |
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