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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1110.1356 | Paulo Pitanga | Jair Koiller, Paulo R. Rodrigues and Paulo Pitanga | Non-Holonomic Connections Following \'Elie Cartan | null | Anais da Academia Brasileira de Ciencias 73 (2) 165 (2001) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this note we revisit E. Cartan's address at the 1928 International
Congress of Mathematicians at Bologna, Italy. The distributions considered here
will be of the same class as those considered by Cartan, a special type which
we call strongly non-holonomic. We set up the groundwork for using Cartan's
method of equi... | [
{
"created": "Thu, 6 Oct 2011 19:22:52 GMT",
"version": "v1"
}
] | 2011-10-07 | [
[
"Koiller",
"Jair",
""
],
[
"Rodrigues",
"Paulo R.",
""
],
[
"Pitanga",
"Paulo",
""
]
] | In this note we revisit E. Cartan's address at the 1928 International Congress of Mathematicians at Bologna, Italy. The distributions considered here will be of the same class as those considered by Cartan, a special type which we call strongly non-holonomic. We set up the groundwork for using Cartan's method of equiva... |
2305.07123 | Bekir Can L\"utf\"uo\u{g}lu | B. Hamil and B. C. L\"utf\"uo\u{g}lu | Thermodynamics and Shadows of quantum-corrected Reissner-Nordstr\"om
black hole surrounded by quintessence | 21 pages, 4 Tables, 7 Figures | Phys. Dark Universe 42, 101293 (2023) | 10.1016/j.dark.2023.101293 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we consider the quantum-corrected Reissner-Nordstr\"om black
hole surrounded by quintessence matter and examine its thermodynamics and
shadow. To this end, we handle the quantum-corrected metric of the black hole,
which is given by Wu and Lui in 2022, and couple the quintessence matter field
effects to ... | [
{
"created": "Thu, 11 May 2023 20:23:29 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Aug 2023 15:59:43 GMT",
"version": "v2"
}
] | 2023-08-22 | [
[
"Hamil",
"B.",
""
],
[
"Lütfüoğlu",
"B. C.",
""
]
] | In this work, we consider the quantum-corrected Reissner-Nordstr\"om black hole surrounded by quintessence matter and examine its thermodynamics and shadow. To this end, we handle the quantum-corrected metric of the black hole, which is given by Wu and Lui in 2022, and couple the quintessence matter field effects to th... |
gr-qc/0102034 | Enric Verdaguer | Enric Verdaguer | Stochastic semiclassical gravity and fluctuations during inflation | 9 pages, Proceedings of the conference on Applied and differential
geometry, Lie algebras and general relativity, Thessaloniki 2000 | null | null | null | gr-qc | null | Stochastic semiclassical gravity is a theory for the interaction of gravity
with quantum matter fields which goes beyond the semiclassical limit. The
theory predicts stochastic fluctuations of the classical gravitational field
induced by the quantum fluctuations of the stress energy tensor of the matter
fields. Here ... | [
{
"created": "Thu, 8 Feb 2001 19:05:31 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Verdaguer",
"Enric",
""
]
] | Stochastic semiclassical gravity is a theory for the interaction of gravity with quantum matter fields which goes beyond the semiclassical limit. The theory predicts stochastic fluctuations of the classical gravitational field induced by the quantum fluctuations of the stress energy tensor of the matter fields. Here we... |
2211.13604 | Ruxandra Bondarescu | Ruxandra Bondarescu, Helena Ubach, Oleg Bulashenko and Andrew P.
Lundgren | Compact Binaries through a Lens: Silent vs. Detectable Microlensing for
the LIGO-Virgo-KAGRA Gravitational Wave Observatories | 17 pages, 12 Figures. Updated References. Submitted to Phys. Rev. D | Phys. Rev. D 108, (2023) 084033 | 10.1103/PhysRevD.108.084033 | null | gr-qc astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Massive objects located between Earth and a compact binary merger can act as
a magnifying glass improving the sensitivity of gravitational wave detectors to
distant events. Depending on the parameters of the system, a point mass lens
between the detector and the source can either lead to a smooth
frequency-dependent ... | [
{
"created": "Thu, 24 Nov 2022 13:45:31 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Dec 2022 21:00:56 GMT",
"version": "v2"
},
{
"created": "Thu, 26 Oct 2023 11:57:46 GMT",
"version": "v3"
}
] | 2023-10-27 | [
[
"Bondarescu",
"Ruxandra",
""
],
[
"Ubach",
"Helena",
""
],
[
"Bulashenko",
"Oleg",
""
],
[
"Lundgren",
"Andrew P.",
""
]
] | Massive objects located between Earth and a compact binary merger can act as a magnifying glass improving the sensitivity of gravitational wave detectors to distant events. Depending on the parameters of the system, a point mass lens between the detector and the source can either lead to a smooth frequency-dependent am... |
gr-qc/0608022 | Farrukh Fattoyev Jabborovich | B. J. Ahmedov, A. V. Khugaev | Remarks on Papapetrou Class of Vacuum Solutions of Einstein Equations | 8 pages | Int.J.Mod.Phys. D13 (2006) 1823-1830 | 10.1142/S0218271804004748 | null | gr-qc astro-ph | null | Class of axially symmetric solutions of vacuum Einstein field equations
including the Papapetrou solution as particular case has been found. It has
been shown that the derived solution describes the external axial symmetric
gravitational field of the source with nonvanishing mass. The general solution
is obtained for... | [
{
"created": "Fri, 4 Aug 2006 09:03:17 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Ahmedov",
"B. J.",
""
],
[
"Khugaev",
"A. V.",
""
]
] | Class of axially symmetric solutions of vacuum Einstein field equations including the Papapetrou solution as particular case has been found. It has been shown that the derived solution describes the external axial symmetric gravitational field of the source with nonvanishing mass. The general solution is obtained for t... |
1709.04016 | Santiago Esteban Perez Bergliaffa | Luz Marina Reyes and Santiago Esteban Perez Bergliaffa | On the emergence of the ${\bf\Lambda}$CDM model from self-interacting
Brans-Dicke theory in ${\bf d= 5}$ | 7 pages, 7 figures | null | 10.1140/epjc/s10052-017-5497-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate whether a self-interacting Brans-Dicke theory in $d=5$ without
matter and with a time-dependent metric can describe, after dimensional
reduction to $d=4$, the FLRW model with accelerated expansion and
non-relativistic matter. By rewriting the effective 4-dimensional theory as an
autonomous three-dimens... | [
{
"created": "Tue, 12 Sep 2017 18:49:50 GMT",
"version": "v1"
}
] | 2018-02-14 | [
[
"Reyes",
"Luz Marina",
""
],
[
"Bergliaffa",
"Santiago Esteban Perez",
""
]
] | We investigate whether a self-interacting Brans-Dicke theory in $d=5$ without matter and with a time-dependent metric can describe, after dimensional reduction to $d=4$, the FLRW model with accelerated expansion and non-relativistic matter. By rewriting the effective 4-dimensional theory as an autonomous three-dimensio... |
1512.08346 | Claus Kiefer | Claus Kiefer | Quantum black hole without singularity | 5 pages, invited contribution to the BH6 session at the Marcel
Grossmann Conference MG14 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the quantization of a spherical dust shell in a rigorous manner.
Classically, the shell can collapse to form a black hole with a singularity. In
the quantum theory, we construct a well-defined self-adjoint extension for the
Hamilton operator. As a result, the evolution is unitary and the singularity is
avo... | [
{
"created": "Mon, 28 Dec 2015 08:50:02 GMT",
"version": "v1"
}
] | 2015-12-29 | [
[
"Kiefer",
"Claus",
""
]
] | We discuss the quantization of a spherical dust shell in a rigorous manner. Classically, the shell can collapse to form a black hole with a singularity. In the quantum theory, we construct a well-defined self-adjoint extension for the Hamilton operator. As a result, the evolution is unitary and the singularity is avoid... |
2311.11752 | Jo\~ao Lu\'is Rosa | Jo\~ao Lu\'is Rosa | Junction conditions in gravity theories with extra scalar degrees of
freedom | 29 pages. V2: published version | Phys. Rev. D 109, 064018 (2024) | 10.1103/PhysRevD.109.064018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we present a general method to obtain the junction conditions of
modified theories of gravity whose action can be written in the form
$f\left(X_1,...,X_n\right)$, where $X_1$ to $X_n$ are any combination of scalar
dependencies, e.g. the Ricci scalar $R$, the trace of the stress-energy tensor
$T$, the Gau... | [
{
"created": "Mon, 20 Nov 2023 13:27:44 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Mar 2024 15:48:21 GMT",
"version": "v2"
}
] | 2024-03-11 | [
[
"Rosa",
"João Luís",
""
]
] | In this work we present a general method to obtain the junction conditions of modified theories of gravity whose action can be written in the form $f\left(X_1,...,X_n\right)$, where $X_1$ to $X_n$ are any combination of scalar dependencies, e.g. the Ricci scalar $R$, the trace of the stress-energy tensor $T$, the Gauss... |
gr-qc/9605068 | Eli Hawkins | Eli Hawkins | Hamiltonian Gravity and Noncommutative Geometry | 22 pages, AMS-LaTeX. Some improvements - mainly to sections 8 and 9.
Typographical errors to equations in appendix corrected | Commun.Math.Phys. 187 (1997) 471-489 | 10.1007/s002200050145 | CGPG-96/5-8 | gr-qc hep-th | null | A version of foliated spacetime is constructed in which the spatial geometry
is described as a time dependent noncommutative geometry. The ADM version of
the gravitational action is expressed in terms of these variables. It is shown
that the vector constraint is obtained without the need for an extraneous shift
vecto... | [
{
"created": "Thu, 30 May 1996 21:47:19 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Mar 1997 23:00:58 GMT",
"version": "v2"
},
{
"created": "Thu, 8 May 1997 21:18:46 GMT",
"version": "v3"
}
] | 2009-10-28 | [
[
"Hawkins",
"Eli",
""
]
] | A version of foliated spacetime is constructed in which the spatial geometry is described as a time dependent noncommutative geometry. The ADM version of the gravitational action is expressed in terms of these variables. It is shown that the vector constraint is obtained without the need for an extraneous shift vector ... |
gr-qc/0502066 | Brendan Foster | Brendan Z. Foster | Metric Redefinitions in Einstein-Aether Theory | 11 pages; v.2: Some clarifying remarks added, to appear in PRD | Phys.Rev. D72 (2005) 044017 | 10.1103/PhysRevD.72.044017 | null | gr-qc | null | `Einstein-Aether' theory, in which gravity couples to a dynamical, time-like,
unit-norm vector field, provides a means for studying Lorentz violation in a
generally covariant setting. Demonstrated here is the effect of a redefinition
of the metric and vector field in terms of the original fields and two free
paramete... | [
{
"created": "Mon, 14 Feb 2005 20:46:49 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Aug 2005 17:44:22 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Foster",
"Brendan Z.",
""
]
] | `Einstein-Aether' theory, in which gravity couples to a dynamical, time-like, unit-norm vector field, provides a means for studying Lorentz violation in a generally covariant setting. Demonstrated here is the effect of a redefinition of the metric and vector field in terms of the original fields and two free parameters... |
2201.12458 | E. Kyriakopoulos | E. Kyriakopoulos | Regular Interior Solutions to the Solution of Kerr which Satisfy the
Weak and the Strong Energy Conditions | 25 pages, 15 figures | J. Math. Phys. 63, 012501 (2022) | 10.1063/5.0080367 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The line element of a class of solutions which match to the solution of Kerr
on an oblate spheroid if the two functions $ F(r)$ and $H(r)$ on which it
depends satisfy certain matching conditions is presented. The non vanishing
components of the Ricci tensor $R_{\mu\nu}$, the Ricci scalar $ R$, the second
order curvat... | [
{
"created": "Sat, 29 Jan 2022 00:05:14 GMT",
"version": "v1"
}
] | 2022-02-01 | [
[
"Kyriakopoulos",
"E.",
""
]
] | The line element of a class of solutions which match to the solution of Kerr on an oblate spheroid if the two functions $ F(r)$ and $H(r)$ on which it depends satisfy certain matching conditions is presented. The non vanishing components of the Ricci tensor $R_{\mu\nu}$, the Ricci scalar $ R$, the second order curvatur... |
1507.05669 | Sumanta Chakraborty | T. Padmanabhan, Sumanta Chakraborty and Dawood Kothawala | Spacetime with zero point length is two-dimensional at the Planck scale | published version | Gen. Rel. Grav. 48, 55 (2016) | 10.1007/s10714-016-2053-2 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is generally believed that any quantum theory of gravity should have a
generic feature --- a quantum of length. We provide a physical ansatz to obtain
an effective non-local metric tensor starting from the standard metric tensor
such that the spacetime acquires a zero-point-length $\ell _{0}$ of the order
of the P... | [
{
"created": "Thu, 16 Jul 2015 20:00:58 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Aug 2015 06:29:34 GMT",
"version": "v2"
},
{
"created": "Thu, 7 Apr 2016 04:15:31 GMT",
"version": "v3"
}
] | 2016-04-08 | [
[
"Padmanabhan",
"T.",
""
],
[
"Chakraborty",
"Sumanta",
""
],
[
"Kothawala",
"Dawood",
""
]
] | It is generally believed that any quantum theory of gravity should have a generic feature --- a quantum of length. We provide a physical ansatz to obtain an effective non-local metric tensor starting from the standard metric tensor such that the spacetime acquires a zero-point-length $\ell _{0}$ of the order of the Pla... |
1703.03710 | Llibert Arest\'e Sal\'o | Jaume Haro, Jaume Amor\'os and Llibert Arest\'e Sal\'o | The matter-ekpyrotic bounce scenario in Loop Quantum Cosmology | 39 pages, 19 figures. Version accepted for publication in JCAP | JCAP 09 (2017) 002 | 10.1088/1475-7516/2017/09/002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We will perform a detailed study of the matter-ekpyrotic bouncing scenario in
Loop Quantum Cosmology using the methods of the dynamical systems theory. We
will show that when the background is driven by a single scalar field, at very
late times, in the contracting phase, all orbits depict a matter dominated
Universe,... | [
{
"created": "Fri, 10 Mar 2017 15:16:04 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Mar 2017 15:51:38 GMT",
"version": "v2"
},
{
"created": "Sun, 13 Aug 2017 16:01:26 GMT",
"version": "v3"
}
] | 2017-09-04 | [
[
"Haro",
"Jaume",
""
],
[
"Amorós",
"Jaume",
""
],
[
"Saló",
"Llibert Aresté",
""
]
] | We will perform a detailed study of the matter-ekpyrotic bouncing scenario in Loop Quantum Cosmology using the methods of the dynamical systems theory. We will show that when the background is driven by a single scalar field, at very late times, in the contracting phase, all orbits depict a matter dominated Universe, w... |
2112.14538 | Laszlo B. Szabados | L\'aszl\'o B. Szabados | A note on Penrose's Spin-Geometry Theorem and the geometry of `empirical
quantum angles' | 10 pages; v2: a convention changed to be compatible with the standard
one, the link in ref [5] is added, one reference is updated; v3: references
added, typos corrected, discussion improved; v4: references updated and
added, final version (Foundations of Physics) | Foundations of Physics (2022) 52:96 | 10.1007/s10701-022-00616-3 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the traditional formalism of quantum mechanics, a simple direct proof of
(a version of) the Spin Geometry Theorem of Penrose is given; and the structure
of a model of the `space of the quantum directions', defined in terms of
elementary $SU(2)$-invariant observables of the quantum mechanical systems, is
sketched.
| [
{
"created": "Wed, 29 Dec 2021 13:28:27 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Mar 2022 11:37:24 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Jul 2022 19:01:33 GMT",
"version": "v3"
},
{
"created": "Thu, 18 Aug 2022 11:21:41 GMT",
"version": "v4"
}
] | 2022-09-08 | [
[
"Szabados",
"László B.",
""
]
] | In the traditional formalism of quantum mechanics, a simple direct proof of (a version of) the Spin Geometry Theorem of Penrose is given; and the structure of a model of the `space of the quantum directions', defined in terms of elementary $SU(2)$-invariant observables of the quantum mechanical systems, is sketched. |
gr-qc/0411075 | Mihalis Dafermos | Mihalis Dafermos and Alan Rendall | An extension principle for the Einstein-Vlasov system in spherical
symmetry | 19 pages, 2 figures | Annales Henri Poincare 6 (2005) 1137-1155 | 10.1007/s00023-005-0235-7 | null | gr-qc | null | We prove that "first singularities" in the non-trapped region of the maximal
development of spherically symmetric asymptotically flat data for the
Einstein-Vlasov system must necessarily emanate from the center. The notion of
"first" depends only on the causal structure and can be described in the
language of termina... | [
{
"created": "Mon, 15 Nov 2004 17:48:06 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Dafermos",
"Mihalis",
""
],
[
"Rendall",
"Alan",
""
]
] | We prove that "first singularities" in the non-trapped region of the maximal development of spherically symmetric asymptotically flat data for the Einstein-Vlasov system must necessarily emanate from the center. The notion of "first" depends only on the causal structure and can be described in the language of terminal ... |
2109.02295 | Ying Wang | Wei Sun, Ying Wang, Fuyao Liu, Xin Wu | Applying explicit symplectic integrator to study chaos of charged
particles around magnetized Kerr black hole | 10 pages,20 figures | null | 10.1140/epjc/s10052-021-09579-7 | null | gr-qc astro-ph.IM nlin.CD physics.comp-ph | http://creativecommons.org/licenses/by/4.0/ | In a recent work of Wu, Wang, Sun and Liu, a second-order explicit symplectic
integrator was proposed for the integrable Kerr spacetime geometry. It is still
suited for simulating the nonintegrable dynamics of charged particles moving
around the Kerr black hole embedded in an external magnetic field. Its
successful c... | [
{
"created": "Mon, 6 Sep 2021 08:54:55 GMT",
"version": "v1"
}
] | 2021-09-07 | [
[
"Sun",
"Wei",
""
],
[
"Wang",
"Ying",
""
],
[
"Liu",
"Fuyao",
""
],
[
"Wu",
"Xin",
""
]
] | In a recent work of Wu, Wang, Sun and Liu, a second-order explicit symplectic integrator was proposed for the integrable Kerr spacetime geometry. It is still suited for simulating the nonintegrable dynamics of charged particles moving around the Kerr black hole embedded in an external magnetic field. Its successful con... |
1901.00938 | David Anderson | David Anderson, Paulo Freire, Nicol\'as Yunes | Binary Pulsar constraints on massless scalar-tensor theories using
Bayesian statistics | 15 pages, 7 figures, Submitted to CQG | null | 10.1088/1361-6382/ab3a1c | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Binary pulsars provide some of the tightest current constraints on modified
theories of gravity and these constraints will only get tighter as radio
astronomers continue timing these systems. These binary pulsars are
particularly good at constraining scalar-tensor theories in which gravity is
mediated by a scalar fie... | [
{
"created": "Thu, 3 Jan 2019 23:09:45 GMT",
"version": "v1"
}
] | 2019-12-11 | [
[
"Anderson",
"David",
""
],
[
"Freire",
"Paulo",
""
],
[
"Yunes",
"Nicolás",
""
]
] | Binary pulsars provide some of the tightest current constraints on modified theories of gravity and these constraints will only get tighter as radio astronomers continue timing these systems. These binary pulsars are particularly good at constraining scalar-tensor theories in which gravity is mediated by a scalar field... |
gr-qc/9910085 | null | Jacek Jezierski | Trautman-Bondi Mass for Scalar Field and Gravity | LaTeX2e, 14 pages, to appear in Rep. on Math. Physics | Coherent States, Quantization, and Gravity; Proceedings of the
XVII Workshop on Geometric Methods in Physics, 1998 | null | UW-KMMF-99-03 | gr-qc | null | The energy at null infinity is presented with the help of a simple example of
a massless scalar field in Minkowski spacetime. It is also discussed for
Einstein gravity. In particular, various aspects of the loss of the energy in
the radiating regime are shown.
| [
{
"created": "Mon, 25 Oct 1999 13:25:33 GMT",
"version": "v1"
}
] | 2013-11-12 | [
[
"Jezierski",
"Jacek",
""
]
] | The energy at null infinity is presented with the help of a simple example of a massless scalar field in Minkowski spacetime. It is also discussed for Einstein gravity. In particular, various aspects of the loss of the energy in the radiating regime are shown. |
gr-qc/0204004 | Sawa Manoff | Sawa Manoff | Mechanics of Continuous Media in $(\bar{L}_{n},g)$-Spaces. IV. Stress
(Tension) Tensor | 38 pages, LaTeX | null | null | null | gr-qc | null | Basic notions of continuous media mechanics are introduced for spaces with
affine connections and metrics. Stress (tension) tensors are considered,
obtained by the use of the method of Lagrangians with covariant derivatives
(MLCD). On the basis of the covariant Noether's identities for the
energy-momentum tensors, Na... | [
{
"created": "Mon, 1 Apr 2002 11:23:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Manoff",
"Sawa",
""
]
] | Basic notions of continuous media mechanics are introduced for spaces with affine connections and metrics. Stress (tension) tensors are considered, obtained by the use of the method of Lagrangians with covariant derivatives (MLCD). On the basis of the covariant Noether's identities for the energy-momentum tensors, Navi... |
gr-qc/9601007 | Jorge Griego | Jorge Griego | Extended knots and the space of states of quantum gravity | 19 pages | Nucl.Phys. B473 (1996) 291-307 | 10.1016/0550-3213(96)00235-0 | IFFC 96-01 | gr-qc | null | In the loop representation the quantum constraints of gravity can be solved.
This fact allowed significant progress in the understanding of the space of
states of the theory. The analysis of the constraints over loop dependent
wavefunctions has been traditionally based upon geometric (in contrast to
analytic) propert... | [
{
"created": "Sun, 7 Jan 1996 01:19:30 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Griego",
"Jorge",
""
]
] | In the loop representation the quantum constraints of gravity can be solved. This fact allowed significant progress in the understanding of the space of states of the theory. The analysis of the constraints over loop dependent wavefunctions has been traditionally based upon geometric (in contrast to analytic) propertie... |
1009.4923 | Tanja Hinderer | Eanna E. Flanagan (Cornell), Tanja Hinderer (Caltech) | Transient resonances in the inspirals of point particles into black
holes | 4 pages, 1 figure, minor corrections | null | 10.1103/PhysRevLett.109.071102 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that transient resonances occur in the two body problem in general
relativity, in the highly relativistic, extreme mass-ratio regime for spinning
black holes. These resonances occur when the ratio of polar and radial orbital
frequencies, which is slowly evolving under the influence of gravitational
radiation ... | [
{
"created": "Fri, 24 Sep 2010 19:52:21 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Sep 2010 20:39:38 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Jul 2012 21:22:42 GMT",
"version": "v3"
}
] | 2013-05-30 | [
[
"Flanagan",
"Eanna E.",
"",
"Cornell"
],
[
"Hinderer",
"Tanja",
"",
"Caltech"
]
] | We show that transient resonances occur in the two body problem in general relativity, in the highly relativistic, extreme mass-ratio regime for spinning black holes. These resonances occur when the ratio of polar and radial orbital frequencies, which is slowly evolving under the influence of gravitational radiation re... |
1611.09781 | Pantelis Apostolopoulos | Pantelis S. Apostolopoulos | Intrinsic Conformal Symmetries in Szekeres models | 6 pages (uses iopart style/class files); (v2) some minor amendments
to match published version in Modern Physics Letters A | Mod.Phys.Lett. A32 (2017) no.19, 1750099 | 10.1142/S0217732317500997 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that Spatially Inhomogeneous (SI) and Irrotational dust models admit
a \emph{6-dimensional algebra } of \emph{Intrinsic Conformal Vector Fields}
(ICVFs) $\mathbf{X}_{\alpha }$ satisfying
$p_{a}^{c}p_{b}^{d}\mathcal{L}_{\mathbf{X}_{\alpha }}p_{cd}=2\phi
(\mathbf{X}_{\alpha })p_{ab}$ where $p_{ab}$ is the assoc... | [
{
"created": "Tue, 29 Nov 2016 18:46:37 GMT",
"version": "v1"
},
{
"created": "Mon, 22 May 2017 15:49:53 GMT",
"version": "v2"
}
] | 2017-06-13 | [
[
"Apostolopoulos",
"Pantelis S.",
""
]
] | We show that Spatially Inhomogeneous (SI) and Irrotational dust models admit a \emph{6-dimensional algebra } of \emph{Intrinsic Conformal Vector Fields} (ICVFs) $\mathbf{X}_{\alpha }$ satisfying $p_{a}^{c}p_{b}^{d}\mathcal{L}_{\mathbf{X}_{\alpha }}p_{cd}=2\phi (\mathbf{X}_{\alpha })p_{ab}$ where $p_{ab}$ is the associa... |
2008.06728 | Peter K.F. Kuhfittig | Peter K.F. Kuhfittig | Noncommutative-geometry wormholes without exotic matter | 6 pages, no figures | Adv. Stud. Theor. Phys.,vol. 14, 219-225 (2020) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A fundamental property of Morris-Thorne wormholes is the so-called flare-out
condition that automatically results in a violation of the null energy
condition (NEC) in classical general relativity. By contrast, in $f(R)$
modified gravity, the material threading the wormhole may actually satisfy the
NEC, while, at the ... | [
{
"created": "Sat, 15 Aug 2020 14:58:23 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Aug 2020 15:52:33 GMT",
"version": "v2"
}
] | 2020-08-20 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | A fundamental property of Morris-Thorne wormholes is the so-called flare-out condition that automatically results in a violation of the null energy condition (NEC) in classical general relativity. By contrast, in $f(R)$ modified gravity, the material threading the wormhole may actually satisfy the NEC, while, at the sa... |
gr-qc/9701007 | Renate Loll | R. Loll (AEI, Potsdam and ESI, Vienna) | Latticing quantum gravity | 7 pages, TeX, 1 figure (epsf); contribution to Santa Margherita
Conference on Constrained Dynamics and Quantum Gravity | Nucl.Phys.Proc.Suppl. 57 (1997) 255-258 | 10.1016/S0920-5632(97)00398-8 | null | gr-qc | null | I discuss some aspects of a lattice approach to canonical quantum gravity in
a connection formulation, discuss how it differs from the continuum
construction, and compare the spectra of geometric operators - encoding
information about components of the spatial metric - for some simple lattice
quantum states.
| [
{
"created": "Mon, 6 Jan 1997 22:45:17 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Loll",
"R.",
"",
"AEI, Potsdam and ESI, Vienna"
]
] | I discuss some aspects of a lattice approach to canonical quantum gravity in a connection formulation, discuss how it differs from the continuum construction, and compare the spectra of geometric operators - encoding information about components of the spatial metric - for some simple lattice quantum states. |
2008.10332 | Jianwei Mei | Jianwei Mei, Yan-Zheng Bai, Jiahui Bao, Enrico Barausse, Lin Cai,
Enrico Canuto, Bin Cao, Wei-Ming Chen, Yu Chen, Yan-Wei Ding, Hui-Zong Duan,
Huimin Fan, Wen-Fan Feng, Honglin Fu, Qing Gao, TianQuan Gao, Yungui Gong,
Xingyu Gou, Chao-Zheng Gu, De-Feng Gu, Zi-Qi He, Martin Hendry, Wei Hong,
Xin-Chun Hu, Yi-Ming... | The TianQin project: current progress on science and technology | 16 pages, 1 figure, invited article to a special section in PTEP | null | 10.1093/ptep/ptaa114 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | TianQin is a planned space-based gravitational wave (GW) observatory
consisting of three earth orbiting satellites with an orbital radius of about
$10^5~{\rm km}$. The satellites will form a equilateral triangle constellation
the plane of which is nearly perpendicular to the ecliptic plane. TianQin aims
to detect GWs... | [
{
"created": "Mon, 24 Aug 2020 11:45:05 GMT",
"version": "v1"
}
] | 2020-08-25 | [
[
"Mei",
"Jianwei",
""
],
[
"Bai",
"Yan-Zheng",
""
],
[
"Bao",
"Jiahui",
""
],
[
"Barausse",
"Enrico",
""
],
[
"Cai",
"Lin",
""
],
[
"Canuto",
"Enrico",
""
],
[
"Cao",
"Bin",
""
],
[
"Chen",
"Wei-... | TianQin is a planned space-based gravitational wave (GW) observatory consisting of three earth orbiting satellites with an orbital radius of about $10^5~{\rm km}$. The satellites will form a equilateral triangle constellation the plane of which is nearly perpendicular to the ecliptic plane. TianQin aims to detect GWs b... |
1101.2198 | Travis Garrett | Travis Garrett | The Observer Class Hypothesis | 14 pages, 1 figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The discovery of a small cosmological constant has stimulated interest in the
measure problem. One should expect to be a typical observer, but defining such
a thing is difficult in the vastness of an eternally inflating universe. We
propose that a crucial prerequisite is understanding why one should exist as an
obser... | [
{
"created": "Tue, 11 Jan 2011 20:40:50 GMT",
"version": "v1"
}
] | 2011-01-12 | [
[
"Garrett",
"Travis",
""
]
] | The discovery of a small cosmological constant has stimulated interest in the measure problem. One should expect to be a typical observer, but defining such a thing is difficult in the vastness of an eternally inflating universe. We propose that a crucial prerequisite is understanding why one should exist as an observe... |
2302.10233 | Francisco M. Blanco | Francisco M. Blanco and \'Eanna \'E. Flanagan | Motion of a spinning particle under the conservative piece of the
self-force is Hamiltonian to first order in mass and spin | 7 pages | null | 10.1103/PhysRevD.107.124017 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We consider the motion of a point particle with spin in a stationary
spacetime. We define, following Witzany (2019) and later Ramond (2022), a
twelve dimensional Hamiltonian dynamical system whose orbits coincide with the
solutions of the Mathisson-Papapetrou-Dixon equations of motion with the
Tulczyjew-Dixon spin su... | [
{
"created": "Mon, 20 Feb 2023 19:05:56 GMT",
"version": "v1"
},
{
"created": "Thu, 4 May 2023 04:54:22 GMT",
"version": "v2"
}
] | 2023-06-21 | [
[
"Blanco",
"Francisco M.",
""
],
[
"Flanagan",
"Éanna É.",
""
]
] | We consider the motion of a point particle with spin in a stationary spacetime. We define, following Witzany (2019) and later Ramond (2022), a twelve dimensional Hamiltonian dynamical system whose orbits coincide with the solutions of the Mathisson-Papapetrou-Dixon equations of motion with the Tulczyjew-Dixon spin supp... |
1902.08734 | Gauranga Samanta | Karim Mosani and Gauranga C. Samanta | Dynamics of General Barotropic Stellar Fluid in the Framework of
$R+2\alpha T$ Gravity | 14 pages, 17 figures | null | 10.1142/S0217732320500893 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational collapse of a spherically symmetric homogeneous perfect
barotropic fluid with linear as well as polytropic type Equation of State (EoS)
has been investigated in the framework of a linear model of $f(R,T)$ gravity.
This modified gravity has the potential to explain the observed cosmic
acceleration. The c... | [
{
"created": "Sat, 23 Feb 2019 04:06:05 GMT",
"version": "v1"
}
] | 2020-05-06 | [
[
"Mosani",
"Karim",
""
],
[
"Samanta",
"Gauranga C.",
""
]
] | Gravitational collapse of a spherically symmetric homogeneous perfect barotropic fluid with linear as well as polytropic type Equation of State (EoS) has been investigated in the framework of a linear model of $f(R,T)$ gravity. This modified gravity has the potential to explain the observed cosmic acceleration. The cal... |
1805.11591 | Petya Nedkova | Galin Gyulchev, Petya Nedkova, Vassil Tinchev, Stoytcho Yazadjiev | On the shadow of rotating traversable wormholes | 19 pages; 12 figures | null | 10.1140/epjc/s10052-018-6012-9 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the shadow of rotating traversable wormholes discussing the role
of the wormhole throat in the shadow formation. For certain classes of
wormholes the throat serves as a potential barrier for light rays with
particular impact parameters, thus modifying the shadow shape. We consider a
couple of wormhole solu... | [
{
"created": "Tue, 29 May 2018 17:18:27 GMT",
"version": "v1"
}
] | 2018-08-01 | [
[
"Gyulchev",
"Galin",
""
],
[
"Nedkova",
"Petya",
""
],
[
"Tinchev",
"Vassil",
""
],
[
"Yazadjiev",
"Stoytcho",
""
]
] | We revisit the shadow of rotating traversable wormholes discussing the role of the wormhole throat in the shadow formation. For certain classes of wormholes the throat serves as a potential barrier for light rays with particular impact parameters, thus modifying the shadow shape. We consider a couple of wormhole soluti... |
2206.00768 | Arnab Mukherjee | Arnab Mukherjee, Sunandan Gangopadhyay and A. S. Majumdar | Unruh quantum Otto engine in the presence of a reflecting boundary | Version accepted in JHEP | JHEP 09 (2022) 105 | 10.1007/JHEP09(2022)105 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We introduce a new model of relativistic quantum analogue of the classical
Otto engine in the presence of a perfectly reflecting boundary. A single qubit
acts as the working substance interacting with a massless quantum scalar field,
with the boundary obeying the Dirichlet condition. The quantum vacuum serves as
a th... | [
{
"created": "Fri, 20 May 2022 04:11:51 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Aug 2022 10:04:12 GMT",
"version": "v2"
}
] | 2022-09-19 | [
[
"Mukherjee",
"Arnab",
""
],
[
"Gangopadhyay",
"Sunandan",
""
],
[
"Majumdar",
"A. S.",
""
]
] | We introduce a new model of relativistic quantum analogue of the classical Otto engine in the presence of a perfectly reflecting boundary. A single qubit acts as the working substance interacting with a massless quantum scalar field, with the boundary obeying the Dirichlet condition. The quantum vacuum serves as a ther... |
1111.7231 | Tamerlan Saidov | Tamerlan Saidov | The Compactification Problems of Additional Dimensions in
Multidimensional Cosmological Theories | 126 pages, 33 figures; the PhD thesis for physical and mathematical
science | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Multidimensionality of our Universe is one of the most intriguing assumption
in modern physics. It follows naturally from theories unifying different
fundamental interactions with gravity, e.g. M/string theory. The idea has
received a great deal of renewed attention over the last few years. However, it
also brings a ... | [
{
"created": "Wed, 30 Nov 2011 16:22:32 GMT",
"version": "v1"
}
] | 2011-12-01 | [
[
"Saidov",
"Tamerlan",
""
]
] | Multidimensionality of our Universe is one of the most intriguing assumption in modern physics. It follows naturally from theories unifying different fundamental interactions with gravity, e.g. M/string theory. The idea has received a great deal of renewed attention over the last few years. However, it also brings a ro... |
2207.06429 | Raimon Luna | Raimon Luna, Gabriele Bozzola, Vitor Cardoso, Vasileios Paschalidis,
Miguel Zilh\~ao | Kicks in charged black hole binaries | 12 pages, 10 figures. v2: Matches published version | Phys.Rev.D 106 (2022) 8, 084017 | 10.1103/PhysRevD.106.084017 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the emission of linear momentum (kicks) by both gravitational and
electromagnetic radiation in fully general-relativistic numerical evolutions of
quasi-circular charged black hole binaries. We derive analytical expressions
for slowly moving bodies and explore numerically a variety of mass ratios and
charge... | [
{
"created": "Wed, 13 Jul 2022 18:00:01 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Nov 2022 17:31:10 GMT",
"version": "v2"
}
] | 2022-11-10 | [
[
"Luna",
"Raimon",
""
],
[
"Bozzola",
"Gabriele",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"Paschalidis",
"Vasileios",
""
],
[
"Zilhão",
"Miguel",
""
]
] | We compute the emission of linear momentum (kicks) by both gravitational and electromagnetic radiation in fully general-relativistic numerical evolutions of quasi-circular charged black hole binaries. We derive analytical expressions for slowly moving bodies and explore numerically a variety of mass ratios and charge-t... |
2307.06139 | Sheref Nasereldin | Sheref Nasereldin and Kayll Lake | Constructing Maximal Extensions of the Vaidya Metric in Israel
Coordinates: I. Integration of the Field Equations | 8 pages, 1 figure, 2 tables | null | 10.1103/PhysRevD.108.124064 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper explores a complete representation of the Vaidya model, a radial
flux of radiation in the eikonal approximation, used for modeling various
phenomena in both classical and semi-classical General Relativity and
Astrophysics. The majority of the applications of the Vaidya model have been
formulated in an inco... | [
{
"created": "Sun, 9 Jul 2023 04:58:49 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jul 2023 00:29:45 GMT",
"version": "v2"
},
{
"created": "Mon, 30 Oct 2023 17:35:10 GMT",
"version": "v3"
},
{
"created": "Tue, 26 Dec 2023 14:20:42 GMT",
"version": "v4"
}
] | 2023-12-27 | [
[
"Nasereldin",
"Sheref",
""
],
[
"Lake",
"Kayll",
""
]
] | This paper explores a complete representation of the Vaidya model, a radial flux of radiation in the eikonal approximation, used for modeling various phenomena in both classical and semi-classical General Relativity and Astrophysics. The majority of the applications of the Vaidya model have been formulated in an incomp... |
1707.07566 | Donald Lynden-Bell Prof | D. Lynden-Bell, S.M. Chitre | Does Viscosity turn inflation into the CMB and $\Lambda$ | 8 pages , 2 figures | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Consideration of the entropy production in the creation of the CMB leads to a
simple model of the evolution of the universe during this period which suggests
a connection between the small observed acceleration term and the early
inflation of a closed universe. From this we find an unexpected relationship
between the... | [
{
"created": "Mon, 24 Jul 2017 14:11:47 GMT",
"version": "v1"
}
] | 2017-07-25 | [
[
"Lynden-Bell",
"D.",
""
],
[
"Chitre",
"S. M.",
""
]
] | Consideration of the entropy production in the creation of the CMB leads to a simple model of the evolution of the universe during this period which suggests a connection between the small observed acceleration term and the early inflation of a closed universe. From this we find an unexpected relationship between the O... |
0712.1313 | Hongbao Zhang | Song He and Hongbao Zhang | The black hole dynamical horizon and generalized second law of
thermodynamics | JHEP style, 8 pages, 2 figures, version to appear in JHEP with typos
corrected | JHEP0712:052,2007 | 10.1088/1126-6708/2007/12/052 | null | gr-qc astro-ph hep-th | null | The generalized second law of thermodynamics for a system containing a black
hole dynamical horizon is proposed in a covariant way. Its validity is also
tested in case of adiabatically collapsing thick light shells.
| [
{
"created": "Sat, 8 Dec 2007 23:16:33 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Dec 2007 16:47:55 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"He",
"Song",
""
],
[
"Zhang",
"Hongbao",
""
]
] | The generalized second law of thermodynamics for a system containing a black hole dynamical horizon is proposed in a covariant way. Its validity is also tested in case of adiabatically collapsing thick light shells. |
1712.05673 | Edward Malec | Janusz Karkowski, Wojciech Kulczycki, Patryk Mach, Edward Malec,
Andrzej Odrzywolek, Michal Pirog | General-relativistic rotation: self-gravitating fluid tori in motion
around black holes | Matches published version | Phys. Rev. D 97, 104034 (2018) | 10.1103/PhysRevD.97.104034 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain from the first principles a general-relativistic Keplerian rotation
law for self-gravitating disks around spinning black holes. This is an
extension of a former rotation law that was designed mainly for toroids around
spin-less black holes. We integrate numerically axial stationary Einstein
equations with s... | [
{
"created": "Fri, 15 Dec 2017 13:50:37 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Mar 2018 12:33:09 GMT",
"version": "v2"
},
{
"created": "Wed, 30 May 2018 12:38:04 GMT",
"version": "v3"
}
] | 2018-06-06 | [
[
"Karkowski",
"Janusz",
""
],
[
"Kulczycki",
"Wojciech",
""
],
[
"Mach",
"Patryk",
""
],
[
"Malec",
"Edward",
""
],
[
"Odrzywolek",
"Andrzej",
""
],
[
"Pirog",
"Michal",
""
]
] | We obtain from the first principles a general-relativistic Keplerian rotation law for self-gravitating disks around spinning black holes. This is an extension of a former rotation law that was designed mainly for toroids around spin-less black holes. We integrate numerically axial stationary Einstein equations with sel... |
1210.3022 | Naresh Dadhich | Naresh Dadhich | The gravitational equation in higher dimensions | latex, 5pages, Contribution to the Proceedings of the Conference,
Relativity and Gravitation: 100 years after Einstein in Prague, June 25-28,
2012 | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Like the Lovelock Lagrangian which is a specific homogeneous polynomial in
Riemann curvature, for an alternative derivation of the gravitational equation
of motion, it is possible to define a specific homogeneous polynomial analogue
of the Riemann curvature, and then the trace of its Bianchi derivative yields
the cor... | [
{
"created": "Wed, 10 Oct 2012 09:32:46 GMT",
"version": "v1"
}
] | 2012-10-12 | [
[
"Dadhich",
"Naresh",
""
]
] | Like the Lovelock Lagrangian which is a specific homogeneous polynomial in Riemann curvature, for an alternative derivation of the gravitational equation of motion, it is possible to define a specific homogeneous polynomial analogue of the Riemann curvature, and then the trace of its Bianchi derivative yields the corre... |
gr-qc/0511031 | Fernando Mendez | R. Aloisio, A. Galante, A. Grillo, S. Liberati, E. Luzio and F. Mendez | Deformed Special Relativity as an effective theory of measurements on
quantum gravitational backgrounds | 11 pages, no figures | Phys.Rev. D73 (2006) 045020 | 10.1103/PhysRevD.73.045020 | null | gr-qc hep-ph hep-th | null | In this article we elaborate on a recently proposed interpretation of DSR as
an effective measurement theory in the presence of non-negligible (albeit
small) quantum gravitational fluctuations. We provide several heuristic
arguments to explain how such a new theory can emerge and discuss the possible
observational co... | [
{
"created": "Sun, 6 Nov 2005 21:49:20 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Aloisio",
"R.",
""
],
[
"Galante",
"A.",
""
],
[
"Grillo",
"A.",
""
],
[
"Liberati",
"S.",
""
],
[
"Luzio",
"E.",
""
],
[
"Mendez",
"F.",
""
]
] | In this article we elaborate on a recently proposed interpretation of DSR as an effective measurement theory in the presence of non-negligible (albeit small) quantum gravitational fluctuations. We provide several heuristic arguments to explain how such a new theory can emerge and discuss the possible observational cons... |
2010.13287 | Thae Hyok Kim | Ok Song An, Jin U Kang, Thae Hyok Kim, Ui Ri Mun | Notes on the post-bounce background dynamics in bouncing cosmologies | 26 pages, 15 figures. Significantly revised and accepted version for
JHEP | null | 10.1007/JHEP10(2021)085 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the post-bounce background dynamics in a certain class of
single bounce scenarios studied in the literature, in which the cosmic bounce
is driven by a scalar field with negative exponential potential such as the
ekpyrotic potential. We show that those models can actually lead to cyclic
evolutions with ... | [
{
"created": "Mon, 26 Oct 2020 02:28:49 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Sep 2021 06:56:50 GMT",
"version": "v2"
}
] | 2021-10-27 | [
[
"An",
"Ok Song",
""
],
[
"Kang",
"Jin U",
""
],
[
"Kim",
"Thae Hyok",
""
],
[
"Mun",
"Ui Ri",
""
]
] | We investigate the post-bounce background dynamics in a certain class of single bounce scenarios studied in the literature, in which the cosmic bounce is driven by a scalar field with negative exponential potential such as the ekpyrotic potential. We show that those models can actually lead to cyclic evolutions with re... |
2406.10436 | Mourad Guenouche | Mourad Guenouche | Effect of the spatial curvature on light bending and time delay in
curved Einstein-Straus-de Sitter solution | 36 pages, 6 figures, 5 tables | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A method of general applicability has been developed, whereby the null
geodesic equations of the Einstein-Straus-de Sitter metric can be integrated
simultaneously in terms of the curvature constant $k$. The purpose is to
generalize the computation of light deflection and time delay by a spherical
mass distribution. A... | [
{
"created": "Fri, 14 Jun 2024 22:58:37 GMT",
"version": "v1"
}
] | 2024-06-18 | [
[
"Guenouche",
"Mourad",
""
]
] | A method of general applicability has been developed, whereby the null geodesic equations of the Einstein-Straus-de Sitter metric can be integrated simultaneously in terms of the curvature constant $k$. The purpose is to generalize the computation of light deflection and time delay by a spherical mass distribution. Ass... |
gr-qc/9603056 | Takeshi Chiba | Takeshi Chiba, Jiro Soda | Critical Behavior in the Brans-Dicke Theory of Gravitation | 6 pages | Prog.Theor.Phys. 96 (1996) 567-574 | 10.1143/PTP.96.567 | KUNS-1386, KUCP-0093 | gr-qc | null | The collapse of a massless scalar field in the Brans-Dicke theory of
gravitation is studied in the analysis of both analytical solution and
numerical one. By conformally transforming the Roberts's solution into the
Brans-Dicke frame, we find for $\omega > -3/2$ that a continuous
self-similarity continues and that the... | [
{
"created": "Thu, 28 Mar 1996 09:21:34 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Chiba",
"Takeshi",
""
],
[
"Soda",
"Jiro",
""
]
] | The collapse of a massless scalar field in the Brans-Dicke theory of gravitation is studied in the analysis of both analytical solution and numerical one. By conformally transforming the Roberts's solution into the Brans-Dicke frame, we find for $\omega > -3/2$ that a continuous self-similarity continues and that the c... |
gr-qc/9806003 | Malcolm MacCallum | M.A.H. MacCallum | Integrability in tetrad formalisms and conservation in cosmology | 10 pages, latex 2.09, uses sprocl.sty To appear in the Proceedings of
the International Seminar on Mathematical Cosmology, Potsdam, Mar-Apr 98, ed.
H.-J. Schmidt and M. Rainer. World Scientific, Singapore | Current Topics in Mathematical Cosmology (Proceedings of the
International Seminar), ed. M. Rainer and H.-J. Schmidt, World Scientific
(1998) | null | null | gr-qc | null | Integrability in general tetrad formalisms is reviewed, following and
clarifying work of Papapetrou and Edgar. The integrability conditions are
(combinations of) the Bianchi equations and their consequences. The
introduction of additional constraints is considered. Recent results on the
conservation of constraints in... | [
{
"created": "Sat, 30 May 1998 16:22:00 GMT",
"version": "v1"
}
] | 2008-02-11 | [
[
"MacCallum",
"M. A. H.",
""
]
] | Integrability in general tetrad formalisms is reviewed, following and clarifying work of Papapetrou and Edgar. The integrability conditions are (combinations of) the Bianchi equations and their consequences. The introduction of additional constraints is considered. Recent results on the conservation of constraints in t... |
1505.01680 | Dirk Puetzfeld | Yuri N. Obukhov, Dirk Puetzfeld | Multipolar test body equations of motion in generalized gravity theories | 54 pages, 3 figures, to appear in "Equations of Motion in
Relativistic Gravity", D. Puetzfeld et al. (eds.), Fundamental theories of
Physics, Springer 2015. arXiv admin note: substantial text overlap with
arXiv:1408.5669 | null | 10.1007/978-3-319-18335-0_2 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give an overview of the derivation of multipolar equations of motion of
extended test bodies for a wide set of gravitational theories beyond the
standard general relativistic framework. The classes of theories covered range
from simple generalizations of General Relativity, e.g. encompassing additional
scalar fiel... | [
{
"created": "Thu, 7 May 2015 12:30:39 GMT",
"version": "v1"
}
] | 2021-04-07 | [
[
"Obukhov",
"Yuri N.",
""
],
[
"Puetzfeld",
"Dirk",
""
]
] | We give an overview of the derivation of multipolar equations of motion of extended test bodies for a wide set of gravitational theories beyond the standard general relativistic framework. The classes of theories covered range from simple generalizations of General Relativity, e.g. encompassing additional scalar fields... |
2011.08222 | Imanol Albarran | Imanol Albarran, Mariam Bouhmadi-L\'opez, Jo\~ao Marto | A varying Dark Energy effective speed of sound parameter in the phantom
Universe | 15 pages, 6 figures. Improved version with an extended physical
discussion. Version published in EPJC | Eur. Phys. J. C 81 (2021) no.9, 803 | 10.1140/epjc/s10052-021-09546-2 | null | gr-qc astro-ph.CO hep-ph | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We analyse the phenomenological effects of a varying Dark Energy (DE)
effective speed of sound parameter, $c^{2}_{\textrm{sd}}$, on the cosmological
perturbations of three phantom DE models. Each of these models induce a
particular abrupt future event known as Big Rip (BR), Little Rip (LR), and
Little Sibling of the ... | [
{
"created": "Mon, 16 Nov 2020 19:09:16 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Nov 2021 12:23:50 GMT",
"version": "v2"
}
] | 2021-11-08 | [
[
"Albarran",
"Imanol",
""
],
[
"Bouhmadi-López",
"Mariam",
""
],
[
"Marto",
"João",
""
]
] | We analyse the phenomenological effects of a varying Dark Energy (DE) effective speed of sound parameter, $c^{2}_{\textrm{sd}}$, on the cosmological perturbations of three phantom DE models. Each of these models induce a particular abrupt future event known as Big Rip (BR), Little Rip (LR), and Little Sibling of the Bi... |
0707.0588 | Mairi Sakellariadou | William Nelson and Mairi Sakellariadou (King's College, London) | Lattice Refining LQC and the Matter Hamiltonian | 15 pages, 3 figures, revtex style; amended version to match
publication in Phys. Rev. D | Phys.Rev.D76:104003,2007 | 10.1103/PhysRevD.76.104003 | null | gr-qc astro-ph hep-ex hep-ph hep-th | null | In the context of loop quantum cosmology, we parametrise the lattice
refinement by a parameter, $A$, and the matter Hamiltonian by a parameter,
$\delta$. We then solve the Hamiltonian constraint for both a self-adjoint, and
a non-self-adjoint Hamiltonian operator. Demanding that the solutions for the
wave-functions o... | [
{
"created": "Wed, 4 Jul 2007 12:11:43 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Aug 2007 11:17:33 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Nelson",
"William",
"",
"King's College, London"
],
[
"Sakellariadou",
"Mairi",
"",
"King's College, London"
]
] | In the context of loop quantum cosmology, we parametrise the lattice refinement by a parameter, $A$, and the matter Hamiltonian by a parameter, $\delta$. We then solve the Hamiltonian constraint for both a self-adjoint, and a non-self-adjoint Hamiltonian operator. Demanding that the solutions for the wave-functions obe... |
2204.06267 | Saskia Grunau | Saskia Grunau and Jutta Kunz | Hyperelliptic functions and motion in general relativity | Published in MDPI Mathematics 2022, 10(12), 1958, Special Issue
"Partial Differential Equations and Applications". (Changes made as requested
by the referees and editors.) | Mathematics 2022, 10(12), 1958 | 10.3390/math10121958 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Analysis of black hole spacetimes requires study of the motion of particles
and light in these spacetimes. Here exact solutions of the geodesic equations
are the means of choice. Numerous interesting black hole spacetimes have been
analyzed in terms of elliptic functions. However, the presence of a
cosmological const... | [
{
"created": "Wed, 13 Apr 2022 09:37:46 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Jun 2022 12:10:18 GMT",
"version": "v2"
}
] | 2022-06-14 | [
[
"Grunau",
"Saskia",
""
],
[
"Kunz",
"Jutta",
""
]
] | Analysis of black hole spacetimes requires study of the motion of particles and light in these spacetimes. Here exact solutions of the geodesic equations are the means of choice. Numerous interesting black hole spacetimes have been analyzed in terms of elliptic functions. However, the presence of a cosmological constan... |
gr-qc/9311023 | Andrew Barvinski | A.O.Barvinsky | Tunnelling geometries II. Reduction methods for functional determinants | 23 pages, latex, figures are not included (available on request by
regular mail), report Alberta Thy-41-93 | Phys.Rev. D50 (1994) 5115-5124 | 10.1103/PhysRevD.50.5115 | null | gr-qc | null | The reduction algorithms for functional determinants of differential
operators on spacetime manifolds of different topological types are presented,
which were recently used for the calculation of the no-boundary wavefunction
and the partition function of tunnelling geometries in quantum gravity and
cosmology.
| [
{
"created": "Sun, 14 Nov 1993 04:55:34 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Barvinsky",
"A. O.",
""
]
] | The reduction algorithms for functional determinants of differential operators on spacetime manifolds of different topological types are presented, which were recently used for the calculation of the no-boundary wavefunction and the partition function of tunnelling geometries in quantum gravity and cosmology. |
gr-qc/0209077 | Olga V. Babourova | Olga V. Babourova, Boris N. Frolov | Matter with dilaton charge in Weyl-Cartan spacetime and evolution of the
Universe | LaTex, 23 pages, no figures, uses IOP.sty, misprints and references
corrected | Class.Quant.Grav.20:1423-1442,2003 | 10.1088/0264-9381/20/8/302 | null | gr-qc astro-ph | null | The perfect dilaton-spin fluid (as a model of the dilaton matter, the
particles of which are endowed with intrinsic spin and dilaton charge) is
considered as the source of the gravitational field in a Weyl-Cartan spacetime.
The variational theory of such fluid is constructed and the dilaton-spin fluid
energy-momentum... | [
{
"created": "Sat, 21 Sep 2002 11:30:07 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Dec 2002 17:51:53 GMT",
"version": "v2"
}
] | 2011-07-19 | [
[
"Babourova",
"Olga V.",
""
],
[
"Frolov",
"Boris N.",
""
]
] | The perfect dilaton-spin fluid (as a model of the dilaton matter, the particles of which are endowed with intrinsic spin and dilaton charge) is considered as the source of the gravitational field in a Weyl-Cartan spacetime. The variational theory of such fluid is constructed and the dilaton-spin fluid energy-momentum t... |
gr-qc/9501037 | Sujan Sengupta | Sujan Sengupta (Indian Institute Of Astrophysics, Bangalore 560034) | TOWARDS A PHYSICAL INTERPRETATION OF THE ANGULAR MOMENTUM PARAMETER
ASSOCIATED WITH THE KERR METRIC | 9 pages, LATEX, no figure | null | null | IIA-TH/95-4 | gr-qc | null | The role of the parameter `$a$' associated with the Kerr metric which
represents the angular momentum per unit mass of a rotating massive object has
been converted into determining the rotationally induced quadrapole electric
field outside a rotating massive object with external dipole magnetic field. A
comparison of... | [
{
"created": "Fri, 27 Jan 1995 08:38:54 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Sengupta",
"Sujan",
"",
"Indian Institute Of Astrophysics, Bangalore 560034"
]
] | The role of the parameter `$a$' associated with the Kerr metric which represents the angular momentum per unit mass of a rotating massive object has been converted into determining the rotationally induced quadrapole electric field outside a rotating massive object with external dipole magnetic field. A comparison of t... |
1101.2147 | Mauricio Cataldo MC | Mauricio Cataldo, Fabiola Arevalo and Patricio Mella | Interacting Kasner-type cosmologies | Accepted for publication in Astrophysics &Space Science, 8 pages | Astrophys.Space Sci.333:287-293,2011 | 10.1007/s10509-011-0596-y | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that Kasner-type cosmologies provide a useful framework for
analyzing the three-dimensional anisotropic expansion because of the
simplification of the anisotropic dynamics. In this paper relativistic
multi-fluid Kasner-type scenarios are studied. We first consider the general
case of a superposition ... | [
{
"created": "Tue, 11 Jan 2011 15:47:26 GMT",
"version": "v1"
}
] | 2015-03-17 | [
[
"Cataldo",
"Mauricio",
""
],
[
"Arevalo",
"Fabiola",
""
],
[
"Mella",
"Patricio",
""
]
] | It is well known that Kasner-type cosmologies provide a useful framework for analyzing the three-dimensional anisotropic expansion because of the simplification of the anisotropic dynamics. In this paper relativistic multi-fluid Kasner-type scenarios are studied. We first consider the general case of a superposition of... |
1703.09149 | Alejandro Perez | Alejandro Perez | Black Holes in Loop Quantum Gravity | Typos corrected, references corrected. To appear in Reports on
Progress in Physics | null | 10.1088/1361-6633/aa7e14 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is a review of the results on black hole physics in the framework of
loop quantum gravity. The key feature underlying the results is the
discreteness of geometric quantities at the Planck scale predicted by this
approach to quantum gravity. Quantum discreteness follows directly from the
canonical quantization pr... | [
{
"created": "Mon, 27 Mar 2017 15:38:15 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Sep 2017 13:12:36 GMT",
"version": "v2"
}
] | 2017-11-22 | [
[
"Perez",
"Alejandro",
""
]
] | This is a review of the results on black hole physics in the framework of loop quantum gravity. The key feature underlying the results is the discreteness of geometric quantities at the Planck scale predicted by this approach to quantum gravity. Quantum discreteness follows directly from the canonical quantization pres... |
gr-qc/9903054 | L. Sriramkumar | L. Sriramkumar and T. Padmanabhan | Probes of the vacuum structure of quantum fields in classical
backgrounds | 43 pages, LaTeX2e (uses ajour.cls); Discussions added in sections
3.3, 5.2 and 6.2 | Int.J.Mod.Phys. D11 (2002) 1-34 | 10.1142/S0218271802001354 | null | gr-qc hep-th | null | We compare the different approaches presently available in literature to
probe the vacuum structure of quantum fields in classical electromagnetic and
gravitational backgrounds. We compare the results from the Bogolubov
transformations and the effective Lagrangian approach with the response of
monopole detectors (of ... | [
{
"created": "Sun, 14 Mar 1999 17:14:13 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Sep 2000 00:27:19 GMT",
"version": "v2"
},
{
"created": "Fri, 23 Feb 2001 03:02:15 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Sriramkumar",
"L.",
""
],
[
"Padmanabhan",
"T.",
""
]
] | We compare the different approaches presently available in literature to probe the vacuum structure of quantum fields in classical electromagnetic and gravitational backgrounds. We compare the results from the Bogolubov transformations and the effective Lagrangian approach with the response of monopole detectors (of th... |
1210.3372 | Si Chen | Si Chen and Steven S. Plotkin | Statistical mechanics of graph models and their implications for
emergent spacetime manifolds | 21 pages, 20 figures, 1 table; v2: References added; Figure added;
Discussion expanded; v3: minor corrections, published version | Phys. Rev. D 87, 084011 (2013) | 10.1103/PhysRevD.87.084011 | null | gr-qc cond-mat.dis-nn cond-mat.stat-mech hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inspired by "quantum graphity" models for spacetime, a statistical model of
graphs is proposed to explore possible realizations of emergent manifolds.
Graphs with given numbers of vertices and edges are considered, governed by a
very general Hamiltonian that merely favors graphs with near-constant valency
and local r... | [
{
"created": "Thu, 11 Oct 2012 20:50:29 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Feb 2013 00:54:36 GMT",
"version": "v2"
},
{
"created": "Fri, 5 Apr 2013 21:18:35 GMT",
"version": "v3"
}
] | 2013-04-09 | [
[
"Chen",
"Si",
""
],
[
"Plotkin",
"Steven S.",
""
]
] | Inspired by "quantum graphity" models for spacetime, a statistical model of graphs is proposed to explore possible realizations of emergent manifolds. Graphs with given numbers of vertices and edges are considered, governed by a very general Hamiltonian that merely favors graphs with near-constant valency and local rot... |
gr-qc/0406118 | Bahram Mashhoon | C. Chicone and B. Mashhoon | Significance of c/sqrt(2) in Relativistic Physics | 7 pages, 1 figure, slightly expanded version accepted for publication
in Class. Quantum Grav | Class.Quant.Grav. 21 (2004) L139 | 10.1088/0264-9381/21/24/L01 | null | gr-qc astro-ph | null | In the description of \emph{relative} motion in accelerated systems and
gravitational fields, inertial and tidal accelerations must be taken into
account, respectively. These involve a critical speed that in the first
approximation can be simply illustrated in the case of motion in one dimension.
For one-dimensional ... | [
{
"created": "Tue, 29 Jun 2004 23:03:15 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Oct 2004 23:48:53 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Chicone",
"C.",
""
],
[
"Mashhoon",
"B.",
""
]
] | In the description of \emph{relative} motion in accelerated systems and gravitational fields, inertial and tidal accelerations must be taken into account, respectively. These involve a critical speed that in the first approximation can be simply illustrated in the case of motion in one dimension. For one-dimensional mo... |
2212.08865 | Jiri Podolsky | Jiri Podolsky, Adam Vratny | New form of all black holes of type D with a cosmological constant | 38 pages, 3 figures. arXiv admin note: text overlap with
arXiv:2108.02239. Final version accepted for publication in Phys. Rev. D,
with corrected electromagnetic field (in agreement with the results presented
in Astorino and Boldi, JHEP 08 (2023) 085, arxiv.org/abs/2305.03744) | Phys. Rev. D 107, 084034 (2023) | 10.1103/PhysRevD.107.084034 | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We present an improved metric form of the complete family of exact black hole
spacetimes of algebraic type D, including any cosmological constant. This class
was found by Debever in 1971, Plebanski and Demianski in 1976, and conveniently
reformulated by Griffiths and Podolsky in 2005. In our new form of this metric
t... | [
{
"created": "Sat, 17 Dec 2022 13:21:33 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Mar 2023 20:40:40 GMT",
"version": "v2"
},
{
"created": "Sun, 26 Nov 2023 13:41:33 GMT",
"version": "v3"
}
] | 2024-07-24 | [
[
"Podolsky",
"Jiri",
""
],
[
"Vratny",
"Adam",
""
]
] | We present an improved metric form of the complete family of exact black hole spacetimes of algebraic type D, including any cosmological constant. This class was found by Debever in 1971, Plebanski and Demianski in 1976, and conveniently reformulated by Griffiths and Podolsky in 2005. In our new form of this metric the... |
2302.10938 | Shahar Hod | Shahar Hod | Comment on: "Possible Relation between the Cosmological Constant and
Standard Model Parameters" | 2 pages | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | It has recently been proposed [M. P. Hertzberg and A. Loeb, arXiv:2302.09090]
that the observed value of the cosmological constant can be related to the
physical parameters of the Standard Model. In the present compact note we point
out that the derivation of the claimed cosmological-constant-standard-model
relation ... | [
{
"created": "Tue, 21 Feb 2023 19:00:08 GMT",
"version": "v1"
}
] | 2023-02-23 | [
[
"Hod",
"Shahar",
""
]
] | It has recently been proposed [M. P. Hertzberg and A. Loeb, arXiv:2302.09090] that the observed value of the cosmological constant can be related to the physical parameters of the Standard Model. In the present compact note we point out that the derivation of the claimed cosmological-constant-standard-model relation pr... |
gr-qc/9912104 | Garcia | L.C.Garcia de Andrade | On de Sitter gravitationally from the spin-torsion primordial density | Latex file | null | null | null | gr-qc | null | Fluctuations on de Sitter solution of Einstein-Cartan field equations are
obtained in terms of the matter density primordial density fluctuations and
spin-torsion density and matter density fluctuations obtained from COBE data.
Einstein-de Sitter solution is shown to be unstable even in the absence of
torsion.The spi... | [
{
"created": "Fri, 24 Dec 1999 09:00:35 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"de Andrade",
"L. C. Garcia",
""
]
] | Fluctuations on de Sitter solution of Einstein-Cartan field equations are obtained in terms of the matter density primordial density fluctuations and spin-torsion density and matter density fluctuations obtained from COBE data. Einstein-de Sitter solution is shown to be unstable even in the absence of torsion.The spin-... |
gr-qc/0605026 | Tomasz Pawlowski | Jerzy Lewandowski, Tomasz Pawlowski | Symmetric non-expanding horizons | Revtex4, 36 pages | Class.Quant.Grav. 23 (2006) 6031-6058 | 10.1088/0264-9381/23/20/022 | IGPG-06/5-1 | gr-qc | null | Symmetric non-expanding horizons are studied in arbitrary dimension. The
global properties -as the zeros of infinitesimal symmetries- are analyzed
particularly carefully. For the class of NEH geometries admitting helical
symmetry a quasi-local analog of Hawking's rigidity theorem is formulated and
proved: the presenc... | [
{
"created": "Thu, 4 May 2006 15:23:37 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Lewandowski",
"Jerzy",
""
],
[
"Pawlowski",
"Tomasz",
""
]
] | Symmetric non-expanding horizons are studied in arbitrary dimension. The global properties -as the zeros of infinitesimal symmetries- are analyzed particularly carefully. For the class of NEH geometries admitting helical symmetry a quasi-local analog of Hawking's rigidity theorem is formulated and proved: the presence ... |
2106.09044 | Anzhong Wang | Jacob Oost, Shinji Mukohyama, and Anzhong Wang | Spherically symmetric exact vacuum solutions in Einstein-aether theory | revtex4-1, one figure and no tables. Some typos are corrected.
Universe 7 (2021) 272 | Universe 7 (2021) 272 | 10.3390/universe7080272 | YITP-21-59, IPMU21-0036 | gr-qc astro-ph.GA hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We study spherically symmetric spacetimes in Einstein-aether theory in three
different coordinate systems, the isotropic, Painlev\`e-Gullstrand, and
Schwarzschild coordinates, in which the aether is always comoving, and present
both time-dependent and time-independent exact vacuum solutions. In particular,
in the iso... | [
{
"created": "Wed, 16 Jun 2021 18:00:04 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Jul 2021 13:30:58 GMT",
"version": "v2"
},
{
"created": "Thu, 22 Jul 2021 19:44:22 GMT",
"version": "v3"
},
{
"created": "Wed, 28 Jul 2021 20:00:02 GMT",
"version": "v4"
}
] | 2021-07-30 | [
[
"Oost",
"Jacob",
""
],
[
"Mukohyama",
"Shinji",
""
],
[
"Wang",
"Anzhong",
""
]
] | We study spherically symmetric spacetimes in Einstein-aether theory in three different coordinate systems, the isotropic, Painlev\`e-Gullstrand, and Schwarzschild coordinates, in which the aether is always comoving, and present both time-dependent and time-independent exact vacuum solutions. In particular, in the isotr... |
gr-qc/0105103 | Vitor Cardoso | Vitor Cardoso, Jose' P. S. Lemos | Quasi-Normal Modes of Schwarzschild Anti-De Sitter Black Holes:
Electromagnetic and Gravitational Perturbations | 2 figures | Phys.Rev. D64 (2001) 084017 | 10.1103/PhysRevD.64.084017 | null | gr-qc hep-th | null | We study the quasi-normal modes (QNM) of electromagnetic and gravitational
perturbations of a Schwarzschild black hole in an asymptotically Anti-de Sitter
(AdS) spacetime. Some of the electromagnetic modes do not oscillate, they only
decay, since they have pure imaginary frequencies. The gravitational modes show
pecu... | [
{
"created": "Mon, 28 May 2001 19:20:39 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Cardoso",
"Vitor",
""
],
[
"Lemos",
"Jose' P. S.",
""
]
] | We study the quasi-normal modes (QNM) of electromagnetic and gravitational perturbations of a Schwarzschild black hole in an asymptotically Anti-de Sitter (AdS) spacetime. Some of the electromagnetic modes do not oscillate, they only decay, since they have pure imaginary frequencies. The gravitational modes show peculi... |
1902.04616 | Rossella Gamba | Rossella Gamba, Jocelyn S. Read, Leslie E. Wade | The impact of the crust equation of state on the analysis of GW170817 | 11 pages, 6 figures | Class. Quantum Grav. 37 025008 (2020) | 10.1088/1361-6382/ab5ba4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The detection of GW170817, the first neutron star-neutron star merger
observed by Advanced LIGO and Virgo, and its following analyses represent the
first contributions of gravitational wave (GW) data to understanding dense
matter. Parameterizing the high density section of the equation of state (EOS)
of both neutron ... | [
{
"created": "Tue, 12 Feb 2019 20:12:23 GMT",
"version": "v1"
}
] | 2021-11-08 | [
[
"Gamba",
"Rossella",
""
],
[
"Read",
"Jocelyn S.",
""
],
[
"Wade",
"Leslie E.",
""
]
] | The detection of GW170817, the first neutron star-neutron star merger observed by Advanced LIGO and Virgo, and its following analyses represent the first contributions of gravitational wave (GW) data to understanding dense matter. Parameterizing the high density section of the equation of state (EOS) of both neutron st... |
gr-qc/9605055 | Jose Ademir Sales de Lima | J.A.S. Lima (Brown Univ. and Univ. Federal do Rio Grande do Norte,
Natal, Brazil) | Thermodynamics of Decaying Vacuum Cosmologies | 21 pages, uses LATEX | Phys.Rev. D54 (1996) 2571-2577 | 10.1103/PhysRevD.54.2571 | BROWN-HET-1013 | gr-qc | null | The thermodynamic behavior of vacuum decaying cosmologies is investigated
within a manifestly covariant formulation. Such a process corresponds to a
continuous irreversible energy flow from the vacuum component to the created
matter constituents. It is shown that if the specific entropy per particle
remains constant ... | [
{
"created": "Sun, 26 May 1996 03:05:48 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Lima",
"J. A. S.",
"",
"Brown Univ. and Univ. Federal do Rio Grande do Norte,\n Natal, Brazil"
]
] | The thermodynamic behavior of vacuum decaying cosmologies is investigated within a manifestly covariant formulation. Such a process corresponds to a continuous irreversible energy flow from the vacuum component to the created matter constituents. It is shown that if the specific entropy per particle remains constant du... |
gr-qc/0012035 | Daniele Oriti | Tullio Regge and Ruth M. Williams | Discrete structures in gravity | 30 pages, 4 figures | J.Math.Phys.41:3964-3984,2000 | 10.1063/1.533333 | DAMTP-2000-101 | gr-qc | null | Discrete approaches to gravity, both classical and quantum, are reviewed
briefly, with emphasis on the method using piecewise-linear spaces. Models of
3-dimensional quantum gravity involving 6j-symbols are then described, and
progress in generalising these models to four dimensions is discussed, as is
the relationshi... | [
{
"created": "Sat, 9 Dec 2000 15:10:53 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Regge",
"Tullio",
""
],
[
"Williams",
"Ruth M.",
""
]
] | Discrete approaches to gravity, both classical and quantum, are reviewed briefly, with emphasis on the method using piecewise-linear spaces. Models of 3-dimensional quantum gravity involving 6j-symbols are then described, and progress in generalising these models to four dimensions is discussed, as is the relationship ... |
2312.00318 | Junji Jia | Zonghai Li and Junji Jia | Deflection of charged signals in a dipole magnetic field in Kerr
background | 10 pages, 1 figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper investigates charged particle deflection in a Kerr spacetime
background with a dipole magnetic field, focusing on the equatorial plane and
employing the weak field approximation. We employ the Jacobi-Randers metric to
unify the treatment of the gravitational and electromagnetic effects on charged
particles... | [
{
"created": "Fri, 1 Dec 2023 03:19:02 GMT",
"version": "v1"
}
] | 2023-12-04 | [
[
"Li",
"Zonghai",
""
],
[
"Jia",
"Junji",
""
]
] | This paper investigates charged particle deflection in a Kerr spacetime background with a dipole magnetic field, focusing on the equatorial plane and employing the weak field approximation. We employ the Jacobi-Randers metric to unify the treatment of the gravitational and electromagnetic effects on charged particles. ... |
2301.03568 | Hannes R\"uter | Hannes R. R\"uter, Violetta Sagun, Wolfgang Tichy, Tim Dietrich | Quasi-equilibrium configurations of binary systems of dark matter
admixed neutron stars | 13 pages, 11 figures, v2: Added investigation of dependence on dark
matter particle mass | null | null | null | gr-qc astro-ph.HE nucl-th | http://creativecommons.org/licenses/by/4.0/ | Using an adapted version of the SGRID code, we construct for the first time
consistent quasi-equilibrium configurations for a binary system consisting of
two neutron stars in which each is admixed with dark matter. The stars are
modelled as a system of two non-interacting fluids minimally coupled to
gravity. For the ... | [
{
"created": "Mon, 9 Jan 2023 18:39:21 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Sep 2023 19:14:39 GMT",
"version": "v2"
}
] | 2023-09-22 | [
[
"Rüter",
"Hannes R.",
""
],
[
"Sagun",
"Violetta",
""
],
[
"Tichy",
"Wolfgang",
""
],
[
"Dietrich",
"Tim",
""
]
] | Using an adapted version of the SGRID code, we construct for the first time consistent quasi-equilibrium configurations for a binary system consisting of two neutron stars in which each is admixed with dark matter. The stars are modelled as a system of two non-interacting fluids minimally coupled to gravity. For the fl... |
1402.5894 | Peter Horvathy | C. Duval, G. W. Gibbons, P. A. Horvathy | Conformal Carroll groups and BMS symmetry | 10 pages, no figure. Fast Track COmmunication, to appear in Class.
Quant. Grav | null | 10.1088/0264-9381/31/9/092001 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Bondi-Metzner-Sachs (BMS) group is shown to be the conformal extension of
Levy-Leblond's "Carroll" group. Further extension to the Newman-Unti (NU) group
is also discussed in the Carroll framework.
| [
{
"created": "Mon, 24 Feb 2014 17:10:17 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Apr 2014 08:10:10 GMT",
"version": "v2"
}
] | 2015-06-18 | [
[
"Duval",
"C.",
""
],
[
"Gibbons",
"G. W.",
""
],
[
"Horvathy",
"P. A.",
""
]
] | The Bondi-Metzner-Sachs (BMS) group is shown to be the conformal extension of Levy-Leblond's "Carroll" group. Further extension to the Newman-Unti (NU) group is also discussed in the Carroll framework. |
1908.04690 | Pedro Ca\~nate Casseres | Pedro Ca\~nate, Nora Breton | New exact traversable wormhole solution to the
Einstein-scalar-Gauss-Bonnet Equations coupled to a power-Maxwell
electrodynamics | 8 pages, 2 figures | Phys. Rev. D 100, 064067 (2019) | 10.1103/PhysRevD.100.064067 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a novel, exact, traversable wormhole (T-WH) solution for
$(3+1)$-dimensional Einstein-scalar-Gauss-Bonnet theory (EsGB) coupled to a
power-Maxwell nonlinear electrodynamics (NLED). The solution is characterized
by two parameters, $\mathcal{Q}\!_{\rm e}$ and $\mathcal{Q}\!_{_{ \mathcal{S}
}}$, associated re... | [
{
"created": "Tue, 13 Aug 2019 14:59:37 GMT",
"version": "v1"
}
] | 2019-10-09 | [
[
"Cañate",
"Pedro",
""
],
[
"Breton",
"Nora",
""
]
] | We present a novel, exact, traversable wormhole (T-WH) solution for $(3+1)$-dimensional Einstein-scalar-Gauss-Bonnet theory (EsGB) coupled to a power-Maxwell nonlinear electrodynamics (NLED). The solution is characterized by two parameters, $\mathcal{Q}\!_{\rm e}$ and $\mathcal{Q}\!_{_{ \mathcal{S} }}$, associated resp... |
gr-qc/9506048 | null | Giampiero Esposito | Asymptotic Heat Kernels in Quantum Field Theory | 15 pages, plain-tex, appearing in Problems on High Energy Physics and
Field Theory, Proceedings of the XVII Workshop, Dedicated to the 140th
Anniversary of Henri Poincare, pp. 127-134 (Protvino: IHEP Pub. 1995) | null | null | DSF preprint 95/29 | gr-qc | null | Asymptotic expansions were first introduced by Henri Poincare in 1886. This
paper describes their application to the semi-classical evaluation of
amplitudes in quantum field theory with boundaries. By using zeta-function
regularization, the conformal anomaly for a massless spin-${1\over 2}$ field in
flat Euclidean ba... | [
{
"created": "Fri, 23 Jun 1995 06:38:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Esposito",
"Giampiero",
""
]
] | Asymptotic expansions were first introduced by Henri Poincare in 1886. This paper describes their application to the semi-classical evaluation of amplitudes in quantum field theory with boundaries. By using zeta-function regularization, the conformal anomaly for a massless spin-${1\over 2}$ field in flat Euclidean back... |
2111.06421 | Saeed Noori Gashti | S. Noori Gashti | Two-Field Inflationary Model and Swampland de Sitter Conjecture | 11 page. 5 figure, Accepted for publication in Journal of Holography
Applications in Physics | Journal of Holography Applications in Physics 2 (1), 13-24 (2022) | 10.22128/JHAP.2021.452.1002 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper, we are going to investigate a new perspective of the two-field
inflation model with respect to the swampland dS conjecture. At the first step,
we study the two-fields inflation model, and apply the swampland conjecture to
our model. Then, we calculate some cosmological parameters such as scalar
spectru... | [
{
"created": "Thu, 11 Nov 2021 19:06:25 GMT",
"version": "v1"
}
] | 2023-02-14 | [
[
"Gashti",
"S. Noori",
""
]
] | In this paper, we are going to investigate a new perspective of the two-field inflation model with respect to the swampland dS conjecture. At the first step, we study the two-fields inflation model, and apply the swampland conjecture to our model. Then, we calculate some cosmological parameters such as scalar spectrum ... |
1204.4344 | Alejandro Perez | Amit Ghosh and Alejandro Perez | Reply to the comment on "Black hole entropy and isolated horizons
thermodynamics" | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The comment arXiv:1204.2729v1 is completely wrong. The author makes serious
mistakes in calculations and judgement. The errors are made at the level of
basic undergraduate statistical mechanics.
| [
{
"created": "Thu, 19 Apr 2012 13:13:39 GMT",
"version": "v1"
}
] | 2012-04-20 | [
[
"Ghosh",
"Amit",
""
],
[
"Perez",
"Alejandro",
""
]
] | The comment arXiv:1204.2729v1 is completely wrong. The author makes serious mistakes in calculations and judgement. The errors are made at the level of basic undergraduate statistical mechanics. |
2101.01374 | Haoran Zhang | Hao-Ran Zhang, Peng-Zhang He, Lei-Shao, Yuan Chen, and Xian-Ru Hu | Shadow of topologically charged rotating braneworld black hole | null | null | 10.1142/S0217732322501450 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we discuss optical properties of the topologically charged
rotating black hole. We study the horizon, the photon region, the shadow of the
black hole and other observables. The results show that in addition to the
black hole spin parameter $a$, the other two parameters, tidal charge $\beta$
and electri... | [
{
"created": "Tue, 5 Jan 2021 06:55:55 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Mar 2021 17:53:41 GMT",
"version": "v2"
}
] | 2022-11-09 | [
[
"Zhang",
"Hao-Ran",
""
],
[
"He",
"Peng-Zhang",
""
],
[
"Lei-Shao",
"",
""
],
[
"Chen",
"Yuan",
""
],
[
"Hu",
"Xian-Ru",
""
]
] | In this paper, we discuss optical properties of the topologically charged rotating black hole. We study the horizon, the photon region, the shadow of the black hole and other observables. The results show that in addition to the black hole spin parameter $a$, the other two parameters, tidal charge $\beta$ and electric ... |
1005.5491 | Abhay Ashtekar | Abhay Ashtekar | The Big Bang and the Quantum | 18 pages, 6 figures. Plenary talk at the Invisible Universe
conference held in Paris in July 2009. To appear in the Proceedings, edited
by J. M. Alimi et al (AIP Publications) | AIP Conf.Proc.1241:109-121,2010 | 10.1063/1.3462605 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This short review is addressed to cosmologists.
General relativity predicts that space-time comes to an end and physics comes
to a halt at the big-bang. Recent developments in loop quantum cosmology have
shown that these predictions cannot be trusted. Quantum geometry effects can
resolve singularities, thereby open... | [
{
"created": "Sat, 29 May 2010 23:02:55 GMT",
"version": "v1"
}
] | 2011-01-25 | [
[
"Ashtekar",
"Abhay",
""
]
] | This short review is addressed to cosmologists. General relativity predicts that space-time comes to an end and physics comes to a halt at the big-bang. Recent developments in loop quantum cosmology have shown that these predictions cannot be trusted. Quantum geometry effects can resolve singularities, thereby opening ... |
gr-qc/9510016 | Moretti Walter | Valter Moretti (Dept. Phys. Uni. Trento, Italy) | Hessling's Quantum Equivalence Principle and the Temperature of an
Extremal Reissner-Nordstr\"{o}m Black Hole | 8 pages, standard LaTex, no figures | null | null | preprint - UTF 363 | gr-qc hep-th | null | The Hessling improvement of the Haag, Narnhofer and Stein principle is
analysed in the case of a massless scalar field propagating outside of an
extremal R-N black hole. It is found that this sort of ``Quantum (Einstein's)
Equivalence Principle'' selects only the R-N vacuum as a physically sensible
state, i.e., it se... | [
{
"created": "Tue, 10 Oct 1995 12:38:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Moretti",
"Valter",
"",
"Dept. Phys. Uni. Trento, Italy"
]
] | The Hessling improvement of the Haag, Narnhofer and Stein principle is analysed in the case of a massless scalar field propagating outside of an extremal R-N black hole. It is found that this sort of ``Quantum (Einstein's) Equivalence Principle'' selects only the R-N vacuum as a physically sensible state, i.e., it sele... |
gr-qc/0309113 | Zuxiang Dai | Zuxiang Dai | Cosmological magnetic fields: generation during inflation and evolution | 43 pages, paper also at
http://www.slac.stanford.edu/spires/find/hep/www?irn=5513243 | null | null | null | gr-qc | null | This paper concerns the generation and evolution of the cosmological
(large-scale $\sim Mpc$) magnetic fields in an inflationary universe. The
universe during inflation is represented by de Sitter space-time. We started
with the Maxwell equations in spatially flat Friedmann-Robertson-Walker (FRW)
Cosmologies. Then we... | [
{
"created": "Tue, 23 Sep 2003 15:27:49 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dai",
"Zuxiang",
""
]
] | This paper concerns the generation and evolution of the cosmological (large-scale $\sim Mpc$) magnetic fields in an inflationary universe. The universe during inflation is represented by de Sitter space-time. We started with the Maxwell equations in spatially flat Friedmann-Robertson-Walker (FRW) Cosmologies. Then we c... |
2206.13227 | Arnau Mas | Jordi Gaset, Arnau Mas | A variational derivation of the field equations of an action-dependent
Einstein-Hilbert Lagrangian | 22 pp; v1: initial submission; v2: minor changes; v3: submitted to
Journal of Geometric Mechanics, updated to reflect changes after peer review | null | 10.3934/jgm.2023014 | null | gr-qc math-ph math.MP physics.class-ph | http://creativecommons.org/licenses/by/4.0/ | We derive the equations of motion of an action-dependent version of the
Einstein-Hilbert Lagrangian, as a specific instance of the Herglotz variational
problem. Action-dependent Lagrangians lead to dissipative dynamics, which
cannot be obtained with the standard method of Lagrangian field theory.
First-order theories... | [
{
"created": "Thu, 23 Jun 2022 20:56:28 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Jul 2022 11:53:05 GMT",
"version": "v2"
},
{
"created": "Mon, 30 Jan 2023 16:44:44 GMT",
"version": "v3"
}
] | 2023-03-08 | [
[
"Gaset",
"Jordi",
""
],
[
"Mas",
"Arnau",
""
]
] | We derive the equations of motion of an action-dependent version of the Einstein-Hilbert Lagrangian, as a specific instance of the Herglotz variational problem. Action-dependent Lagrangians lead to dissipative dynamics, which cannot be obtained with the standard method of Lagrangian field theory. First-order theories o... |
1710.01822 | Ivan Gentile De Austria | Ivan Gentile de Austria | Bounds for the metric and shift vector on extreme Kerr under linear
axially symmetric gravitational perturbations | 14 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present integral estimates for the shift and induced metric in the maximal
isothermal gauge, corresponding to linear axially symmetric gravitational
perturbations over the Minkowski and extreme Kerr metric. These bounds are a
step towards finding pointwise bounds for the perturbations. In particular the
presented ... | [
{
"created": "Wed, 4 Oct 2017 22:59:01 GMT",
"version": "v1"
}
] | 2017-10-06 | [
[
"de Austria",
"Ivan Gentile",
""
]
] | We present integral estimates for the shift and induced metric in the maximal isothermal gauge, corresponding to linear axially symmetric gravitational perturbations over the Minkowski and extreme Kerr metric. These bounds are a step towards finding pointwise bounds for the perturbations. In particular the presented es... |
gr-qc/9810041 | Korotkin Dmitrii | D.Korotkin and V.Matveev | Solutions of Schlesinger system and Ernst equation in terms of
theta-functions | null | null | null | AEI-087, august 1998 | gr-qc | null | We discuss the relationship between Schlesinger system and stationary
axisymmetric Einstein's equation on the level of algebro-geometric solutions.
In particular, we calculate all metric coefficients corresponding to solutions
of Ernst equation in terms of theta-functions.
| [
{
"created": "Mon, 12 Oct 1998 09:58:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Korotkin",
"D.",
""
],
[
"Matveev",
"V.",
""
]
] | We discuss the relationship between Schlesinger system and stationary axisymmetric Einstein's equation on the level of algebro-geometric solutions. In particular, we calculate all metric coefficients corresponding to solutions of Ernst equation in terms of theta-functions. |
gr-qc/9306020 | null | Gerhard Rein, Alan D. Rendall, and Jack Schaeffer | A regularity theorem for solutions of the spherically symmetric
Vlasov-Einstein system | 15 pages, Latex, report # 2 | Commun.Math.Phys. 168 (1995) 467-478 | 10.1007/BF02101839 | null | gr-qc | null | In a previous paper two of the authors (G. R. and A. D. R.) showed that there
exist global, classical solutions of the spherically symmetric Vlasov-Einstein
system for small initial data. The present paper continues this investigation
and allows also large initial data. It is shown that if a solution of the
spherical... | [
{
"created": "Wed, 16 Jun 1993 09:18:47 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Rein",
"Gerhard",
""
],
[
"Rendall",
"Alan D.",
""
],
[
"Schaeffer",
"Jack",
""
]
] | In a previous paper two of the authors (G. R. and A. D. R.) showed that there exist global, classical solutions of the spherically symmetric Vlasov-Einstein system for small initial data. The present paper continues this investigation and allows also large initial data. It is shown that if a solution of the spherically... |
gr-qc/9305007 | Don N. Page | Don N. Page | Average Entropy of a Subsystem | 10 pages, LaTeX. Title change and minor corrections added before
publication in Phys. Rev. Lett. 71 (1993) 1291. Alberta-Thy-22-93 | Phys.Rev.Lett.71:1291-1294,1993 | 10.1103/PhysRevLett.71.1291 | null | gr-qc hep-th | null | If a quantum system of Hilbert space dimension $mn$ is in a random pure
state, the average entropy of a subsystem of dimension $m\leq n$ is conjectured
to be $S_{m,n}=\sum_{k=n+1}^{mn}\frac{1}{k}-\frac{m-1}{2n}$ and is shown to be
$\simeq \ln m - \frac{m}{2n}$ for $1\ll m\leq n$. Thus there is less than
one-half unit... | [
{
"created": "Fri, 7 May 1993 17:14:41 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Aug 1993 23:23:25 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Page",
"Don N.",
""
]
] | If a quantum system of Hilbert space dimension $mn$ is in a random pure state, the average entropy of a subsystem of dimension $m\leq n$ is conjectured to be $S_{m,n}=\sum_{k=n+1}^{mn}\frac{1}{k}-\frac{m-1}{2n}$ and is shown to be $\simeq \ln m - \frac{m}{2n}$ for $1\ll m\leq n$. Thus there is less than one-half unit o... |
1501.04773 | Francisco Lobo | Mohammad Reza Mehdizadeh, Mahdi Kord Zangeneh, Francisco S. N. Lobo | Einstein-Gauss-Bonnet traversable wormholes satisfying the weak energy
condition | 8 pages, 6 figures. V2: 9 pages, minor modifications, references
added and typo corrected; to appear in PRD | Phys.Rev.D91:084004,2015 | 10.1103/PhysRevD.91.084004 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we explore higher-dimensional asymptotically flat wormhole
geometries in the framework of Gauss-Bonnet (GB) gravity and investigate the
effects of the GB term, by considering a specific radial-dependent redshift
function and by imposing a particular equation of state. This work is motivated
by previous... | [
{
"created": "Tue, 20 Jan 2015 12:14:31 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Mar 2015 19:32:17 GMT",
"version": "v2"
}
] | 2015-04-06 | [
[
"Mehdizadeh",
"Mohammad Reza",
""
],
[
"Zangeneh",
"Mahdi Kord",
""
],
[
"Lobo",
"Francisco S. N.",
""
]
] | In this paper, we explore higher-dimensional asymptotically flat wormhole geometries in the framework of Gauss-Bonnet (GB) gravity and investigate the effects of the GB term, by considering a specific radial-dependent redshift function and by imposing a particular equation of state. This work is motivated by previous a... |
1903.01726 | Tomas Ledvinka | Tom\'a\v{s} Ledvinka and Ji\v{r}\'i Bi\v{c}\'ak | Disk sources of the Kerr and Tomimatsu-Sato spacetimes: construction and
physical properties | null | null | 10.1103/PhysRevD.99.064046 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct the disk sources matched to the exact vacuum Kerr and to the two
classes of Tomimatsu-Sato spacetimes. We analyze two models of the matter
forming these disks. At each radius we consider either a rotating massive ring
with pressure or two counter-rotating streams of particles in circular geodesic
motion.... | [
{
"created": "Tue, 5 Mar 2019 08:46:07 GMT",
"version": "v1"
}
] | 2019-04-17 | [
[
"Ledvinka",
"Tomáš",
""
],
[
"Bičák",
"Jiří",
""
]
] | We construct the disk sources matched to the exact vacuum Kerr and to the two classes of Tomimatsu-Sato spacetimes. We analyze two models of the matter forming these disks. At each radius we consider either a rotating massive ring with pressure or two counter-rotating streams of particles in circular geodesic motion. D... |
1309.6622 | Seyed Meraj Mousavi Rasouli | S. M. M. Rasouli, A. H. Ziaie, J. Marto and P. V. Moniz | Gravitational Collapse of a Homogeneous Scalar Field in Deformed Phase
Space | 17 pages, 17 figures | Phys. Rev. D 89, 044028 (2014) | 10.1103/PhysRevD.89.044028 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the gravitational collapse of a homogeneous scalar field, minimally
coupled to gravity, in the presence of a particular type of dynamical
deformation between the canonical momenta of the scale factor and of the scalar
field. In the absence of such a deformation, a class of solutions can be found
in the liter... | [
{
"created": "Wed, 25 Sep 2013 19:44:41 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Mar 2014 00:21:55 GMT",
"version": "v2"
}
] | 2014-03-05 | [
[
"Rasouli",
"S. M. M.",
""
],
[
"Ziaie",
"A. H.",
""
],
[
"Marto",
"J.",
""
],
[
"Moniz",
"P. V.",
""
]
] | We study the gravitational collapse of a homogeneous scalar field, minimally coupled to gravity, in the presence of a particular type of dynamical deformation between the canonical momenta of the scale factor and of the scalar field. In the absence of such a deformation, a class of solutions can be found in the literat... |
2007.02409 | Mushtaq Ahmad Sial | G. Mustafa, M. Farasat Shamir, Mushtaq Ahmad | Bardeen Stellar Structures with Karmarkar Condition | 23 pages, 17 figures | Phys. Dark Universe 30, 100652 (2020) | 10.1016/j.dark.2020.100652 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Current study is focussed to discuss the existence of a new family of compact
star solutions by adopting the Karmarkar condition in the background of Bardeen
black hole geometry. For this purpose, we consider static spherically symmetric
spacetime with anisotropic fluid distribution in the presence of electric
charge... | [
{
"created": "Sun, 5 Jul 2020 18:26:08 GMT",
"version": "v1"
}
] | 2020-07-07 | [
[
"Mustafa",
"G.",
""
],
[
"Shamir",
"M. Farasat",
""
],
[
"Ahmad",
"Mushtaq",
""
]
] | Current study is focussed to discuss the existence of a new family of compact star solutions by adopting the Karmarkar condition in the background of Bardeen black hole geometry. For this purpose, we consider static spherically symmetric spacetime with anisotropic fluid distribution in the presence of electric charge. ... |
1801.08944 | Jose Natario | Jo\~ao L. Costa, Jos\'e Nat\'ario, Pedro Oliveira | Decay of solutions of the wave equation in expanding cosmological
spacetimes | 25 pages, 3 figures; v2: small corrections; v3: typos corrected,
matches final published version; v4: typo in the statement of Theorem 2
corrected; v5: sign error in the conformally invariant wave equation fixed | J. Hyperbolic Differ. Equ. 16 (2019) 35-58 | 10.1142/S0219891619500024 | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the decay of solutions of the wave equation in some expanding
cosmological spacetimes, namely flat Friedmann-Lema\^itre-Robertson-Walker
(FLRW) models and the cosmological region of the Reissner-Nordstr\"om-de Sitter
(RNdS) solution. By introducing a partial energy and using an iteration scheme,
we find that... | [
{
"created": "Fri, 26 Jan 2018 19:00:08 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Nov 2018 17:11:00 GMT",
"version": "v2"
},
{
"created": "Wed, 3 Jul 2019 13:13:28 GMT",
"version": "v3"
},
{
"created": "Mon, 22 Jul 2019 10:55:39 GMT",
"version": "v4"
},
{
"cr... | 2020-05-06 | [
[
"Costa",
"João L.",
""
],
[
"Natário",
"José",
""
],
[
"Oliveira",
"Pedro",
""
]
] | We study the decay of solutions of the wave equation in some expanding cosmological spacetimes, namely flat Friedmann-Lema\^itre-Robertson-Walker (FLRW) models and the cosmological region of the Reissner-Nordstr\"om-de Sitter (RNdS) solution. By introducing a partial energy and using an iteration scheme, we find that, ... |
gr-qc/9208010 | Kiyoshi Kamimura | K.Kamimura and T.Fukuyama | Massive Analogue of Ashtekar-CJD Action | 6p. Tex | null | 10.1016/0083-6656(93)90105-S | TOHO-FP-9243 | gr-qc hep-th | null | The action of Ashtekar gravity have been found by Cappovilla, Jacobson and
Dell. It does not depend on the metric nor the signature of the space-time. The
action has a similar structure as that of a massless relativistic particle. The
former is naturally generalized by adding a term analogous to a mass term of
the re... | [
{
"created": "Tue, 25 Aug 1992 02:25:20 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Kamimura",
"K.",
""
],
[
"Fukuyama",
"T.",
""
]
] | The action of Ashtekar gravity have been found by Cappovilla, Jacobson and Dell. It does not depend on the metric nor the signature of the space-time. The action has a similar structure as that of a massless relativistic particle. The former is naturally generalized by adding a term analogous to a mass term of the rela... |
1810.12336 | K\'evin Nguyen | Oleg Evnin and K\'evin Nguyen | A Graceful Exit for the Cosmological Constant Damping Scenario | v2: 16 pages, minor improvements, discussion added, typos corrected | Phys. Rev. D 98, 124031 (2018) | 10.1103/PhysRevD.98.124031 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a broad and simple class of scalar-tensor scenarios that
successfully realize dynamical damping of the effective cosmological constant,
therefore providing a viable dynamical solution to the fine-tuning or "old"
cosmological constant problem. In contrast to early versions of this approach,
pioneered in the... | [
{
"created": "Mon, 29 Oct 2018 18:19:12 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Nov 2018 09:04:45 GMT",
"version": "v2"
}
] | 2018-12-27 | [
[
"Evnin",
"Oleg",
""
],
[
"Nguyen",
"Kévin",
""
]
] | We present a broad and simple class of scalar-tensor scenarios that successfully realize dynamical damping of the effective cosmological constant, therefore providing a viable dynamical solution to the fine-tuning or "old" cosmological constant problem. In contrast to early versions of this approach, pioneered in the w... |
1202.4639 | Thomas W. Baumgarte | Thomas W. Baumgarte | An alternative approach to solving the Hamiltonian constraint | 5 pages, 4 figures, matches version published in PRD | Phys.Rev.D85:084013,2012 | 10.1103/PhysRevD.85.084013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Solving Einstein's constraint equations for the construction of black hole
initial data requires handling the black hole singularity. Typically, this is
done either with the excision method, in which the black hole interior is
excised from the numerical grid, or with the puncture method, in which the
singular part of... | [
{
"created": "Tue, 21 Feb 2012 13:52:41 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Apr 2012 12:45:53 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Baumgarte",
"Thomas W.",
""
]
] | Solving Einstein's constraint equations for the construction of black hole initial data requires handling the black hole singularity. Typically, this is done either with the excision method, in which the black hole interior is excised from the numerical grid, or with the puncture method, in which the singular part of t... |
1311.0268 | N\'estor Ortiz | N\'estor Ortiz and Olivier Sarbach | Cauchy horizon stability in a collapsing spherical dust cloud I:
geometric optic approximation and spherically symmetric test fields | 15 pages, 7 figures | Class.Quant.Grav. 31 (2014) 075003 | 10.1088/0264-9381/31/7/075003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A spherical dust cloud which is initially at rest and which has a
monotonously decaying density profile collapses and forms a shell-focussing
singularity. Provided the density profile is not too flat, meaning that its
second radial derivative is negative at the center, this singularity is visible
to local, and someti... | [
{
"created": "Fri, 1 Nov 2013 19:30:11 GMT",
"version": "v1"
}
] | 2014-06-17 | [
[
"Ortiz",
"Néstor",
""
],
[
"Sarbach",
"Olivier",
""
]
] | A spherical dust cloud which is initially at rest and which has a monotonously decaying density profile collapses and forms a shell-focussing singularity. Provided the density profile is not too flat, meaning that its second radial derivative is negative at the center, this singularity is visible to local, and sometime... |
gr-qc/9906078 | Alejandro Corichi | Alejandro Corichi and Andres Gomberoff | On a spacetime duality in 2+1 gravity | 23 pages, 2 figures, Revtex file | Class.Quant.Grav. 16 (1999) 3579-3598 | 10.1088/0264-9381/16/11/309 | NSF-ITP-99-061, SU-GP-99/6-1 | gr-qc hep-th math-ph math.MP | null | We consider 2+1 dimensional gravity with a cosmological constant, and explore
a duality that exists between space-times that have the De Sitter group SO(3,1)
as its local isometry group. In particular, the Lorentzian theory with a
positive cosmological constant is dual to the Euclidean theory with a negative
cosmolog... | [
{
"created": "Thu, 17 Jun 1999 23:06:13 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Oct 1999 16:22:21 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Corichi",
"Alejandro",
""
],
[
"Gomberoff",
"Andres",
""
]
] | We consider 2+1 dimensional gravity with a cosmological constant, and explore a duality that exists between space-times that have the De Sitter group SO(3,1) as its local isometry group. In particular, the Lorentzian theory with a positive cosmological constant is dual to the Euclidean theory with a negative cosmologic... |
gr-qc/0408048 | Guoying Chee | G. Y. Chee | Self-dual teleparallel gravity and the positive energy theorem | 11 pages, no figure | null | null | null | gr-qc | null | A self-dual and anti-self-dual decomposition of the teleparallel gravity is
carried out and the self-dual Lagrangian of the teleparallel gravity which is
equivalent to the Ashtekar Lagrangian in vacuum is obtained. Its Hamiltonian
formulation and the constraint analysis are developed. Starting from Witten's
equation ... | [
{
"created": "Mon, 16 Aug 2004 16:20:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Chee",
"G. Y.",
""
]
] | A self-dual and anti-self-dual decomposition of the teleparallel gravity is carried out and the self-dual Lagrangian of the teleparallel gravity which is equivalent to the Ashtekar Lagrangian in vacuum is obtained. Its Hamiltonian formulation and the constraint analysis are developed. Starting from Witten's equation Ne... |
2405.09271 | Bobby Eka Gunara | Golfin Ekatria, Andy Octavian Latief, Fiki Taufik Akbar, and Bobby Eka
Gunara | Gravitational Collapse in Higher-Dimensional Rastall Gravity with and
without Cosmological Constant | 13 pages, 6 figures, comments are welcome | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider a spherically symmetric homogeneous perfect fluid undergoing a
gravitational collapse to singularity in the framework of higher-dimensional
Rastall gravity in the cases of vanishing and nonvanishing cosmological
constants. The possible final states of the collapse in any finite dimension
are black hole an... | [
{
"created": "Wed, 15 May 2024 11:40:02 GMT",
"version": "v1"
}
] | 2024-05-16 | [
[
"Ekatria",
"Golfin",
""
],
[
"Latief",
"Andy Octavian",
""
],
[
"Akbar",
"Fiki Taufik",
""
],
[
"Gunara",
"Bobby Eka",
""
]
] | We consider a spherically symmetric homogeneous perfect fluid undergoing a gravitational collapse to singularity in the framework of higher-dimensional Rastall gravity in the cases of vanishing and nonvanishing cosmological constants. The possible final states of the collapse in any finite dimension are black hole and ... |
gr-qc/0303104 | Roberto Gomez | Roberto Gomez (Pittsburgh Supercomputing Center) and Simonetta
Frittelli (Duquesne University) | First-order quasilinear canonical representation of the characteristic
formulation of the Einstein equations | revtex4, 7 pages, text and references added, typos corrected, to
appear in Phys. Rev. D | Phys.Rev.D68:084013,2003 | 10.1103/PhysRevD.68.084013 | NSF-KITP-03-58 | gr-qc | null | We prescribe a choice of 18 variables in all that casts the equations of the
fully nonlinear characteristic formulation of general relativity in
first--order quasi-linear canonical form. At the analytical level, a
formulation of this type allows us to make concrete statements about existence
of solutions. In addition... | [
{
"created": "Wed, 26 Mar 2003 15:12:19 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Aug 2003 17:33:17 GMT",
"version": "v2"
}
] | 2011-07-19 | [
[
"Gomez",
"Roberto",
"",
"Pittsburgh Supercomputing Center"
],
[
"Frittelli",
"Simonetta",
"",
"Duquesne University"
]
] | We prescribe a choice of 18 variables in all that casts the equations of the fully nonlinear characteristic formulation of general relativity in first--order quasi-linear canonical form. At the analytical level, a formulation of this type allows us to make concrete statements about existence of solutions. In addition, ... |
2107.02077 | Mitja Fridman Mr. | Saurya Das, Mitja Fridman, Gaetano Lambiase and Elias C. Vagenas | Baryon Asymmetry from the Generalized Uncertainty Principle | 13 pages, 0 figures | Phys. Lett. B 824, 136841 (2022) | 10.1016/j.physletb.2021.136841 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The unexplained observed baryon asymmetry in the Universe is a long-standing
problem in physics, with no satisfactory resolution so far. To explain this
asymmetry, three Sakharov conditions must be met. An interaction term which
couples space-time and the baryon current is considered, which satisfies the
first two Sa... | [
{
"created": "Mon, 5 Jul 2021 15:17:19 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Nov 2021 14:29:35 GMT",
"version": "v2"
}
] | 2022-08-16 | [
[
"Das",
"Saurya",
""
],
[
"Fridman",
"Mitja",
""
],
[
"Lambiase",
"Gaetano",
""
],
[
"Vagenas",
"Elias C.",
""
]
] | The unexplained observed baryon asymmetry in the Universe is a long-standing problem in physics, with no satisfactory resolution so far. To explain this asymmetry, three Sakharov conditions must be met. An interaction term which couples space-time and the baryon current is considered, which satisfies the first two Sakh... |
1512.06829 | Neil J. Cornish | Neil J. Cornish and Laura M. Sampson | Towards Robust Gravitational Wave Detection with Pulsar Timing Arrays | 11 pages, 12 figures | Phys. Rev. D 93, 104047 (2016) | 10.1103/PhysRevD.93.104047 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Precision timing of highly stable milli-second pulsars is a promising
technique for the detection of very low frequency sources of gravitational
waves. In any single pulsar, a stochastic gravitational wave signal appears as
an additional source of timing noise that can be absorbed by the noise model,
and so it is onl... | [
{
"created": "Mon, 21 Dec 2015 20:54:18 GMT",
"version": "v1"
}
] | 2016-06-01 | [
[
"Cornish",
"Neil J.",
""
],
[
"Sampson",
"Laura M.",
""
]
] | Precision timing of highly stable milli-second pulsars is a promising technique for the detection of very low frequency sources of gravitational waves. In any single pulsar, a stochastic gravitational wave signal appears as an additional source of timing noise that can be absorbed by the noise model, and so it is only ... |
gr-qc/0006041 | Santiago Esteban Perez Bergliaffa | S. E. Perez Bergliaffa and K. E. Hibberd | On the stress-energy tensor of a rotating wormhole | 4 pages, LaTex. Revised version, with several changes | null | null | null | gr-qc | null | We analyze the stress-energy tensor necessary to generate a general
stationary and axisymmetric spacetime. The constraints on the geometry arising
from considering a perfect fluid as a source are derived. For a fluid with a
nonzero stress tensor, we obtain two necessary conditions on the metric. As an
example, we sho... | [
{
"created": "Mon, 12 Jun 2000 14:40:22 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Jul 2000 16:08:19 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Bergliaffa",
"S. E. Perez",
""
],
[
"Hibberd",
"K. E.",
""
]
] | We analyze the stress-energy tensor necessary to generate a general stationary and axisymmetric spacetime. The constraints on the geometry arising from considering a perfect fluid as a source are derived. For a fluid with a nonzero stress tensor, we obtain two necessary conditions on the metric. As an example, we show ... |
1810.01286 | Muhammad Sharif | M. Sharif and Sara Ashraf | Thermodynamics of Modified Cosmic Chaplygin Gas | 16 pages, 6 figures, to appear in AHEP | Ad. High Energy Phys. 2018(2018)8949252 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we examine the thermodynamic features of an exotic fluid known
as modified cosmic Chaplygin gas in the context of homogeneous isotropic
universe model. For this purpose, the behavior of physical parameters are
discussed that help to analyze nature of the universe. Using specific heat
formalism, the val... | [
{
"created": "Mon, 1 Oct 2018 09:18:43 GMT",
"version": "v1"
}
] | 2018-10-05 | [
[
"Sharif",
"M.",
""
],
[
"Ashraf",
"Sara",
""
]
] | In this paper, we examine the thermodynamic features of an exotic fluid known as modified cosmic Chaplygin gas in the context of homogeneous isotropic universe model. For this purpose, the behavior of physical parameters are discussed that help to analyze nature of the universe. Using specific heat formalism, the valid... |
1410.5276 | Hanno Sahlmann | Jerzy Lewandowski and Hanno Sahlmann | A symmetric scalar constraint for loop quantum gravity | 10 pages, v2: added some references and explanations. This version is
identical to the published one up to cosmetics | Phys. Rev. D 91, 044022 (2015) | 10.1103/PhysRevD.91.044022 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of loop quantum gravity, we define a new Hilbert space of
states which are solutions of a large number of components of the
diffeomorphism constraint. On this Hilbert space, using the methods of
Thiemann, we obtain a family of gravitational scalar constraints. They preserve
the Hilbert space for ever... | [
{
"created": "Mon, 20 Oct 2014 13:56:16 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Feb 2015 07:49:07 GMT",
"version": "v2"
}
] | 2015-03-05 | [
[
"Lewandowski",
"Jerzy",
""
],
[
"Sahlmann",
"Hanno",
""
]
] | In the framework of loop quantum gravity, we define a new Hilbert space of states which are solutions of a large number of components of the diffeomorphism constraint. On this Hilbert space, using the methods of Thiemann, we obtain a family of gravitational scalar constraints. They preserve the Hilbert space for every ... |
gr-qc/0006076 | Remo Garattini | Remo Garattini | Casimir energy and variational methods in AdS spacetime | Submitted to Classical and Quantum Gravity | Class.Quant.Grav. 17 (2000) 3335-3352 | 10.1088/0264-9381/17/16/316 | null | gr-qc hep-th | null | Following the subtraction procedure for manifolds with boundaries, we
calculate by variational methods, the Schwarzschild-Anti-de Sitter and the
Anti-de Sitter space energy difference. By computing the one loop approximation
for TT tensors we discover the existence of an unstable mode at zero
temperature, which can b... | [
{
"created": "Wed, 21 Jun 2000 16:25:18 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Garattini",
"Remo",
""
]
] | Following the subtraction procedure for manifolds with boundaries, we calculate by variational methods, the Schwarzschild-Anti-de Sitter and the Anti-de Sitter space energy difference. By computing the one loop approximation for TT tensors we discover the existence of an unstable mode at zero temperature, which can be ... |
2309.00865 | Lorenzo Fatibene | S.Carloni, L.Fatibene, M.Ferraris, R.G.McLenaghan, A.Orizzonte | Relativistic GPS in 3-dimensions | 29 pages, 8 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We extend to three dimensions the proposal of a completely relativistic
positioning system (rPS). The system does not rely on approximations, in fact,
it works at a few Schwarzschild radii from a black hole, and it does not rely
on Newtonian physics or special relativity. Since general relativity (GR)
claims to be ou... | [
{
"created": "Sat, 2 Sep 2023 08:42:57 GMT",
"version": "v1"
}
] | 2023-09-06 | [
[
"Carloni",
"S.",
""
],
[
"Fatibene",
"L.",
""
],
[
"Ferraris",
"M.",
""
],
[
"McLenaghan",
"R. G.",
""
],
[
"Orizzonte",
"A.",
""
]
] | We extend to three dimensions the proposal of a completely relativistic positioning system (rPS). The system does not rely on approximations, in fact, it works at a few Schwarzschild radii from a black hole, and it does not rely on Newtonian physics or special relativity. Since general relativity (GR) claims to be our ... |
gr-qc/0102043 | Maurice H. P. M. van Putten | Maurice H.P.M. van Putten | Gravitational radiation from long gamma-ray bursts | submitted; Presented at the 2001 Aspen Winter Conference on
Gravitational Waves, Feb. 4-10, 2001, Aspen | null | null | null | gr-qc astro-ph | null | Long gamma-ray bursts (GRBs) are probably powered by high-angular momentum
black hole-torus systems in suspended accretion. The torus will radiate
gravitational waves as non-axisymmetric instabilities develop. The luminosity
in gravitational-wave emissions is expected to compare favorably with the
observed isotropic ... | [
{
"created": "Sun, 11 Feb 2001 19:31:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"van Putten",
"Maurice H. P. M.",
""
]
] | Long gamma-ray bursts (GRBs) are probably powered by high-angular momentum black hole-torus systems in suspended accretion. The torus will radiate gravitational waves as non-axisymmetric instabilities develop. The luminosity in gravitational-wave emissions is expected to compare favorably with the observed isotropic eq... |
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