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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1609.02406 | Mehrdad Farhoudi Prof. | Nadereh Namavarian and Mehrdad Farhoudi | Cosmological Constant Implementing Mach Principle in General Relativity | 12 pages | Gen. Rel. Grav. 48 (2016) 140 | 10.1007/s10714-016-2135-1 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the fact that noticing on the operational meaning of the physical
concepts played an impetus role in the appearance of general relativity (GR).
Thus, we have paid more attention to the operational definition of the
gravitational coupling constant in this theory as a dimensional constant which
is gained th... | [
{
"created": "Thu, 8 Sep 2016 13:09:05 GMT",
"version": "v1"
}
] | 2016-10-05 | [
[
"Namavarian",
"Nadereh",
""
],
[
"Farhoudi",
"Mehrdad",
""
]
] | We consider the fact that noticing on the operational meaning of the physical concepts played an impetus role in the appearance of general relativity (GR). Thus, we have paid more attention to the operational definition of the gravitational coupling constant in this theory as a dimensional constant which is gained thro... |
2211.00743 | Kirill Bronnikov | Kirill A. Bronnikov | Regular black holes sourced by nonlinear electrodynamics | 30 pages, 4 figures. Invited chapter for the edited book "Regular
Black Holes: Towards a New Paradigm of the Gravitational Collapse'' (Ed. C.
Bambi, Springer Singapore, expected in 2023) | null | null | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The paper is a brief review on the existence and basic properties of static,
spherically symmetric regular black hole solutions of general relativity, where
the source of gravity is represented by nonlinear electromagnetic fields with
the Lagrangian function $L$ depending on the single invariant $f =
F_{\mu\nu}F^{\mu... | [
{
"created": "Tue, 1 Nov 2022 20:56:11 GMT",
"version": "v1"
}
] | 2022-11-03 | [
[
"Bronnikov",
"Kirill A.",
""
]
] | The paper is a brief review on the existence and basic properties of static, spherically symmetric regular black hole solutions of general relativity, where the source of gravity is represented by nonlinear electromagnetic fields with the Lagrangian function $L$ depending on the single invariant $f = F_{\mu\nu}F^{\mu\n... |
1109.3846 | T. Padmanabhan | T. Padmanabhan | Some aspects of field equations in generalised theories of gravity | latex; 11 pages; no figures; ver 2: references added; to appear in
Phys. Rev. D | null | 10.1103/PhysRevD.84.124041 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A class of theories of gravity based on a Lagrangian which depends on the
curvature and metric - but not on the derivatives of the curvature tensor - is
of interest in several contexts including in the development of the paradigm
that treats gravity as an emergent phenomenon. This class of models contains,
as an impo... | [
{
"created": "Sun, 18 Sep 2011 06:07:59 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Dec 2011 06:43:40 GMT",
"version": "v2"
}
] | 2013-05-29 | [
[
"Padmanabhan",
"T.",
""
]
] | A class of theories of gravity based on a Lagrangian which depends on the curvature and metric - but not on the derivatives of the curvature tensor - is of interest in several contexts including in the development of the paradigm that treats gravity as an emergent phenomenon. This class of models contains, as an import... |
1810.10035 | Yiwen Huang | Yiwen Huang, Hannah Middleton, Ken K.-Y. Ng, Salvatore Vitale, John
Veitch | Characterization of low-significance gravitational-wave compact binary
sources | 15 pages, 12 figures, 6 tables; Results unchanged from previous
versions, provided additional details; public data release for posterior
samples: https://git.ligo.org/yiwen.huang/public-lowsnr-data-release/ | Phys. Rev. D 98, 123021 (2018) | 10.1103/PhysRevD.98.123021 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Advanced LIGO and Virgo have so far detected gravitational waves from 10
binary black hole mergers (BBH) and 1 binary neutron star merger (BNS). In the
future, we expect the detection of many more marginal sources, since compact
binary coalescences detectable by advanced ground-based instruments are roughly
distribut... | [
{
"created": "Tue, 23 Oct 2018 18:27:19 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Oct 2018 00:20:05 GMT",
"version": "v2"
},
{
"created": "Fri, 21 Dec 2018 22:30:35 GMT",
"version": "v3"
}
] | 2019-01-03 | [
[
"Huang",
"Yiwen",
""
],
[
"Middleton",
"Hannah",
""
],
[
"Ng",
"Ken K. -Y.",
""
],
[
"Vitale",
"Salvatore",
""
],
[
"Veitch",
"John",
""
]
] | Advanced LIGO and Virgo have so far detected gravitational waves from 10 binary black hole mergers (BBH) and 1 binary neutron star merger (BNS). In the future, we expect the detection of many more marginal sources, since compact binary coalescences detectable by advanced ground-based instruments are roughly distributed... |
gr-qc/0407104 | Bryan Kelleher | Edward Anderson, Julian Barbour, Brendan Z. Foster, Bryan Kelleher,
Niall \'O Murchadha | The physical gravitational degrees of freedom | Replaced with published version (minor changes and added references) | Class.Quant.Grav. 22 (2005) 1795-1802 | 10.1088/0264-9381/22/9/020 | null | gr-qc | null | When constructing general relativity (GR), Einstein required 4D general
covariance. In contrast, we derive GR (in the compact, without boundary case)
as a theory of evolving 3-dimensional conformal Riemannian geometries obtained
by imposing two general principles: 1) time is derived from change; 2) motion
and size ar... | [
{
"created": "Tue, 27 Jul 2004 14:47:13 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Aug 2005 23:48:30 GMT",
"version": "v2"
}
] | 2016-08-16 | [
[
"Anderson",
"Edward",
""
],
[
"Barbour",
"Julian",
""
],
[
"Foster",
"Brendan Z.",
""
],
[
"Kelleher",
"Bryan",
""
],
[
"Murchadha",
"Niall Ó",
""
]
] | When constructing general relativity (GR), Einstein required 4D general covariance. In contrast, we derive GR (in the compact, without boundary case) as a theory of evolving 3-dimensional conformal Riemannian geometries obtained by imposing two general principles: 1) time is derived from change; 2) motion and size are ... |
gr-qc/0510074 | Chongming Xu | Chongming Xu, Yanxiang Gong, Xuejun Wu, MichaelSoffel and Sergei
Klioner | Second Order Post Newtonian Equations of Light Propagation in Multiple
Systems | 14 pages, refs.22 | null | null | null | gr-qc | null | The first order post Newtonian scheme in multiple systems presented by
Damour-Soffel-Xu is extended to the second order one for light propagation
without changing the advantage of the scheme on the linear partial differential
equations of potential and vector potential. The spatial components of the
metric tensor are... | [
{
"created": "Sun, 16 Oct 2005 10:24:07 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Xu",
"Chongming",
""
],
[
"Gong",
"Yanxiang",
""
],
[
"Wu",
"Xuejun",
""
],
[
"MichaelSoffel",
"",
""
],
[
"Klioner",
"Sergei",
""
]
] | The first order post Newtonian scheme in multiple systems presented by Damour-Soffel-Xu is extended to the second order one for light propagation without changing the advantage of the scheme on the linear partial differential equations of potential and vector potential. The spatial components of the metric tensor are e... |
2109.01794 | Kirill Bronnikov | K.A. Bronnikov, S.V. Bolokhov, M.V. Skvortsova | Spherically symmetric space-times in generalized hybrid metric-Palatini
gravity | 18 pages, 7 figures | Grav. Cosmol. 27 (4), 358-374 (2021) | 10.1134/S0202289321040046 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss vacuum static, spherically symmetric asymptotically flat solutions
of the generalized hybrid metric-Palatini theory of gravity (generalized HMPG)
suggested by B\"ohmer and Tamanini, involving both a metric $g_{\mu\nu}$ and an
independent connection $\hat \Gamma_{\mu\nu}{}^\alpha$; the gravitational field
L... | [
{
"created": "Sat, 4 Sep 2021 05:47:23 GMT",
"version": "v1"
}
] | 2023-11-14 | [
[
"Bronnikov",
"K. A.",
""
],
[
"Bolokhov",
"S. V.",
""
],
[
"Skvortsova",
"M. V.",
""
]
] | We discuss vacuum static, spherically symmetric asymptotically flat solutions of the generalized hybrid metric-Palatini theory of gravity (generalized HMPG) suggested by B\"ohmer and Tamanini, involving both a metric $g_{\mu\nu}$ and an independent connection $\hat \Gamma_{\mu\nu}{}^\alpha$; the gravitational field Lag... |
2003.11891 | Donato Bini | Donato Bini, Thibault Damour, Andrea Geralico | Binary dynamics at the fifth and fifth-and-a-half post-Newtonian orders | 39 pages; 2 figures | Phys. Rev. D 102, 024062 (2020) | 10.1103/PhysRevD.102.024062 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the new methodology introduced in a recent Letter [Phys.\ Rev.\ Lett.\
{\bf 123}, 231104 (2019)], we present the details of the computation of the
conservative dynamics of gravitationally interacting binary systems at the
fifth post-Newtonian (5PN) level, together with its extension at the
fifth-and-a-half post... | [
{
"created": "Thu, 26 Mar 2020 13:33:03 GMT",
"version": "v1"
}
] | 2020-07-29 | [
[
"Bini",
"Donato",
""
],
[
"Damour",
"Thibault",
""
],
[
"Geralico",
"Andrea",
""
]
] | Using the new methodology introduced in a recent Letter [Phys.\ Rev.\ Lett.\ {\bf 123}, 231104 (2019)], we present the details of the computation of the conservative dynamics of gravitationally interacting binary systems at the fifth post-Newtonian (5PN) level, together with its extension at the fifth-and-a-half post-N... |
1906.12055 | Yuki Niiyama | Yuki Niiyama, Yuya Nakamura, Ryosuke Zaimokuya, Yu Furuya, Yuuiti
Sendouda | Non-Fierz-Pauli bimetric theory from quadratic curvature gravity on
Einstein manifolds | 4 pages | null | null | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that, in four-dimensional spacetimes with an arbitrary Einstein
metric, with and without a cosmological constant, perturbative dynamical
degrees of freedom in generic quadratic-curvature gravity can be decoupled into
massless and massive parts. The massive part has the structure identical to,
modulo the over-... | [
{
"created": "Fri, 28 Jun 2019 06:24:09 GMT",
"version": "v1"
}
] | 2019-07-01 | [
[
"Niiyama",
"Yuki",
""
],
[
"Nakamura",
"Yuya",
""
],
[
"Zaimokuya",
"Ryosuke",
""
],
[
"Furuya",
"Yu",
""
],
[
"Sendouda",
"Yuuiti",
""
]
] | We show that, in four-dimensional spacetimes with an arbitrary Einstein metric, with and without a cosmological constant, perturbative dynamical degrees of freedom in generic quadratic-curvature gravity can be decoupled into massless and massive parts. The massive part has the structure identical to, modulo the over-al... |
2109.03297 | Alejandro Asc\'arate | Alejandro Asc\'arate | Spacetime Relationalism in GR and QG | 17 pages | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We provide here a philosophical basis for [arXiv:2012.03994,
arXiv:2107.06693] based on the notion of spacetime relationalism. We argue that
the view which is more cleanly compatible with GR is that in which the
spacetime manifold is a relational (or 'emergent') property of the aggregate or
physical sum of gravitatio... | [
{
"created": "Tue, 7 Sep 2021 19:13:44 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Sep 2021 16:35:15 GMT",
"version": "v2"
},
{
"created": "Sat, 18 Sep 2021 19:50:24 GMT",
"version": "v3"
}
] | 2021-09-21 | [
[
"Ascárate",
"Alejandro",
""
]
] | We provide here a philosophical basis for [arXiv:2012.03994, arXiv:2107.06693] based on the notion of spacetime relationalism. We argue that the view which is more cleanly compatible with GR is that in which the spacetime manifold is a relational (or 'emergent') property of the aggregate or physical sum of gravitationa... |
2201.09106 | Ahmad Al-Badawi | Ahmad Al-Badawi | Greybody factor and perturbation of a Schwarzschild black hole with
string clouds and quintessence | 14 pages, 6 figures | Gen Relativ Gravit 54, 11 (2022) | 10.1007/s10714-022-02900-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigated the Dirac and Klein-Gordan equations, as well
as the greybody factor for a Schwarzschild black hole (SBH) immersed in
quintessence and associated with a cloud of strings. Primarily, we study the
Dirac equation using a null tetrad in the Newman- Penrose (NP) formalism. Next,
we separate ... | [
{
"created": "Sat, 22 Jan 2022 18:10:02 GMT",
"version": "v1"
}
] | 2022-02-02 | [
[
"Al-Badawi",
"Ahmad",
""
]
] | In this paper, we investigated the Dirac and Klein-Gordan equations, as well as the greybody factor for a Schwarzschild black hole (SBH) immersed in quintessence and associated with a cloud of strings. Primarily, we study the Dirac equation using a null tetrad in the Newman- Penrose (NP) formalism. Next, we separate th... |
1912.04490 | Hwajin Um | Hwajin Um, Wontae Kim | Formation of the Hayward black hole from a collapsing shell | 18 pages, 3 figures, published version in Phys. Rev. D | Phys. Rev. D 101, 065017 (2020) | 10.1103/PhysRevD.101.065017 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a collapsing shell of matter to form the Hayward black hole and
investigate semiclassically quantum radiation from the shell. Using the
Israel's formulation, we obtain the mass relation between the collapsing shell
and the Hayward black hole. By using the functional Schr\"{o}dinger formulation
for the mas... | [
{
"created": "Tue, 10 Dec 2019 04:39:12 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Mar 2020 04:41:04 GMT",
"version": "v2"
}
] | 2020-04-01 | [
[
"Um",
"Hwajin",
""
],
[
"Kim",
"Wontae",
""
]
] | We consider a collapsing shell of matter to form the Hayward black hole and investigate semiclassically quantum radiation from the shell. Using the Israel's formulation, we obtain the mass relation between the collapsing shell and the Hayward black hole. By using the functional Schr\"{o}dinger formulation for the massl... |
1407.4361 | Pierre Teyssandier | Pierre Teyssandier | New tools for determining the light travel time in static, spherically
symmetric spacetimes beyond the order $G^2$ | 37 pages; published in "Frontiers in Relativistic Celestial
Mechanics", vol. 2, ed. by S. M. Kopeikin, Series "De Gruyter Studies in
Mathematical Physics 22", 2014. arXiv admin note: substantial text overlap
with arXiv:1304.3683 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is mainly devoted to the determination of the travel time of a
photon as a function of the positions of the emitter and the receiver in a
large class of static, spherically symmetric spacetimes. Such a function -
often called time transfer function - is of crucial interest for testing metric
theories of gr... | [
{
"created": "Wed, 16 Jul 2014 16:07:02 GMT",
"version": "v1"
}
] | 2014-07-17 | [
[
"Teyssandier",
"Pierre",
""
]
] | This paper is mainly devoted to the determination of the travel time of a photon as a function of the positions of the emitter and the receiver in a large class of static, spherically symmetric spacetimes. Such a function - often called time transfer function - is of crucial interest for testing metric theories of grav... |
1612.04572 | Fabio Briscese | Fabio Briscese | The Schr$\ddot{o}$dinger-Poisson equations as the large-N limit of the
Newtonian N-body system: applications to the large scale dark matter dynamics | Accepted for publication in the Euro. Phys. J. C | Eur. Phys. J. C (2017) 77: 623 | 10.1140/epjc/s10052-017-5209-7 | null | gr-qc astro-ph.CO nlin.CD quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper it is argued how the dynamics of the classical Newtonian N-body
system can be described in terms of the Schr$\ddot{o}$dinger-Poisson equations
in the large $N$ limit. This result is based on the stochastic quantization
introduced by Nelson, and on the Calogero conjecture. According to the Calogero
conje... | [
{
"created": "Wed, 14 Dec 2016 10:53:05 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Sep 2017 09:31:10 GMT",
"version": "v2"
},
{
"created": "Mon, 18 Sep 2017 10:47:14 GMT",
"version": "v3"
}
] | 2017-09-29 | [
[
"Briscese",
"Fabio",
""
]
] | In this paper it is argued how the dynamics of the classical Newtonian N-body system can be described in terms of the Schr$\ddot{o}$dinger-Poisson equations in the large $N$ limit. This result is based on the stochastic quantization introduced by Nelson, and on the Calogero conjecture. According to the Calogero conject... |
2109.14225 | N. Malsawmtluangi | N. Malsawmtluangi | $e^+e^-$ annihilation on the stochastic background of primordial
gravitational waves with BKP18 | 13 pages, 6 figures | Eur. Phys. J. C 82, 1000 (2022) | 10.1140/epjc/s10052-022-10978-7 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | The evolution of inflationary primordial gravitational waves with the
expansion of the universe is studied while taking into account the $e^+e^-$
annihilation which leads to step correction in the spectrum of primordial
gravitational waves which is $\sim 10\%$ in the amplitude and $\sim 25\%$ in
the energy density. T... | [
{
"created": "Wed, 29 Sep 2021 07:06:59 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Nov 2022 09:21:28 GMT",
"version": "v2"
}
] | 2022-11-09 | [
[
"Malsawmtluangi",
"N.",
""
]
] | The evolution of inflationary primordial gravitational waves with the expansion of the universe is studied while taking into account the $e^+e^-$ annihilation which leads to step correction in the spectrum of primordial gravitational waves which is $\sim 10\%$ in the amplitude and $\sim 25\%$ in the energy density. The... |
1010.1041 | Thomas Sotiriou | Baojiu Li, Thomas P. Sotiriou, John D. Barrow | f(T) Gravity and local Lorentz invariance | 4 pages, no figure; v2: Added discussion about modifying the theory
in order to make it manifestly Lorentz covariant and one reference; v3: minor
changes to match published version | Phys.Rev.D83:064035,2011 | 10.1103/PhysRevD.83.064035 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that in theories of generalised teleparallel gravity, whose
Lagrangians are algebraic functions of the usual teleparallel Lagrangian, the
action and the field equations are not invariant under local Lorentz
transformations. We also argue that these theories appear to have extra degrees
of freedom with respect... | [
{
"created": "Wed, 6 Oct 2010 00:28:09 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Oct 2010 21:45:09 GMT",
"version": "v2"
},
{
"created": "Thu, 24 Mar 2011 17:18:30 GMT",
"version": "v3"
}
] | 2012-07-04 | [
[
"Li",
"Baojiu",
""
],
[
"Sotiriou",
"Thomas P.",
""
],
[
"Barrow",
"John D.",
""
]
] | We show that in theories of generalised teleparallel gravity, whose Lagrangians are algebraic functions of the usual teleparallel Lagrangian, the action and the field equations are not invariant under local Lorentz transformations. We also argue that these theories appear to have extra degrees of freedom with respect t... |
1302.0043 | J\"org Frauendiener | Florian Beyer, Georgios Doulis, J\"org Frauendiener and Ben Whale | Linearized gravitational waves near space-like and null infinity | Contribution to the Proceedings of the Spanish Relativity Meeting ERE
2012, 5 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Linear perturbations on Minkowski space are used to probe numerically the
remote region of an asymptotically flat space-time close to spatial infinity.
The study is undertaken within the framework of Friedrich's conformal field
equations and the corresponding conformal representation of spatial infinity as
a cylinder... | [
{
"created": "Fri, 1 Feb 2013 00:04:42 GMT",
"version": "v1"
}
] | 2013-02-04 | [
[
"Beyer",
"Florian",
""
],
[
"Doulis",
"Georgios",
""
],
[
"Frauendiener",
"Jörg",
""
],
[
"Whale",
"Ben",
""
]
] | Linear perturbations on Minkowski space are used to probe numerically the remote region of an asymptotically flat space-time close to spatial infinity. The study is undertaken within the framework of Friedrich's conformal field equations and the corresponding conformal representation of spatial infinity as a cylinder. ... |
1910.13789 | James Vickers | Guenther Hoermann, Yafet Sanchez Sanchez, Christian Spreitzer, James
Vickers | Green Operators in Low Regularity Spacetimes and Quantum Field Theory | 44 pages, 1 figure | null | 10.1088/1361-6382/ab839a | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we develop the mathematics required in order to provide a
description of the observables for quantum fields on low-regularity spacetimes.
In particular we consider the case of a massless scalar field $\phi$ on a
globally hyperbolic spacetime $M$ with $C^{1,1}$ metric $g$. This first entails
showing that... | [
{
"created": "Wed, 30 Oct 2019 12:00:12 GMT",
"version": "v1"
}
] | 2020-08-26 | [
[
"Hoermann",
"Guenther",
""
],
[
"Sanchez",
"Yafet Sanchez",
""
],
[
"Spreitzer",
"Christian",
""
],
[
"Vickers",
"James",
""
]
] | In this paper we develop the mathematics required in order to provide a description of the observables for quantum fields on low-regularity spacetimes. In particular we consider the case of a massless scalar field $\phi$ on a globally hyperbolic spacetime $M$ with $C^{1,1}$ metric $g$. This first entails showing that t... |
1811.01104 | Athanasios Tzikas | Athanasios G. Tzikas | Bardeen black hole chemistry | 16 pages, 4 figures, version in press on Physics Letters B | Physics Letters B 788 (2019) 219-224 | 10.1016/j.physletb.2018.11.036 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present paper we try to connect the Bardeen black hole with the
concept of the recently proposed black hole chemistry. We study thermodynamic
properties of the regular black hole with an anti-deSitter background. The
negative cosmological constant $\Lambda$ plays the role of the positive
thermodynamic pressure... | [
{
"created": "Fri, 2 Nov 2018 21:54:02 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Nov 2018 10:39:50 GMT",
"version": "v2"
}
] | 2018-12-03 | [
[
"Tzikas",
"Athanasios G.",
""
]
] | In the present paper we try to connect the Bardeen black hole with the concept of the recently proposed black hole chemistry. We study thermodynamic properties of the regular black hole with an anti-deSitter background. The negative cosmological constant $\Lambda$ plays the role of the positive thermodynamic pressure o... |
gr-qc/0504011 | Curt Cutler | Curt Cutler and Bernard F. Schutz | The generalized F-statistic: multiple detectors and multiple GW pulsars | 6 pages, 0 figures, submitted to PRD; section IV substantially
enlarged and revised, and a few typos corrected | Phys.Rev. D72 (2005) 063006 | 10.1103/PhysRevD.72.063006 | null | gr-qc | null | The F-statistic, derived by Jaranowski, Krolak & Schutz (1998), is the
optimal (frequentist) statistic for the detection of nearly periodic
gravitational waves from known neutron stars, in the presence of stationary,
Gaussian detector noise. The F-statistic was originally derived for the case of
a single detector, wh... | [
{
"created": "Mon, 4 Apr 2005 07:36:12 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jul 2005 12:13:46 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Cutler",
"Curt",
""
],
[
"Schutz",
"Bernard F.",
""
]
] | The F-statistic, derived by Jaranowski, Krolak & Schutz (1998), is the optimal (frequentist) statistic for the detection of nearly periodic gravitational waves from known neutron stars, in the presence of stationary, Gaussian detector noise. The F-statistic was originally derived for the case of a single detector, whos... |
gr-qc/9510039 | Konstantinov Mikhail Yuryevich | M.Yu. Konstantinov | Comments on ''The Principle of Self-Consistency as a consequence of the
Principle of Minimal Action'' | 6 pages, LaTeX | null | null | RGS-CSVR-005/95 | gr-qc | null | The so called ''Principle of the self-consistency'' for space-time models
with causality violation, which was firstly formulated by I.D.Novikov, is
discussed for the test particle motion and for test scalar field. It is shown
that the constraints, which provide the self-concistensy of test particle
motion have pure g... | [
{
"created": "Thu, 19 Oct 1995 09:49:34 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Konstantinov",
"M. Yu.",
""
]
] | The so called ''Principle of the self-consistency'' for space-time models with causality violation, which was firstly formulated by I.D.Novikov, is discussed for the test particle motion and for test scalar field. It is shown that the constraints, which provide the self-concistensy of test particle motion have pure geo... |
2306.08029 | B\'eatrice Bonga | B\'eatrice Bonga, Claudio Bunster, Alfredo P\'erez | Gravitational radiation with $\Lambda>0$ | 17 pages + 2 appendices, matches version accepted for publication in
PRD | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We study gravitational radiation for a positive value of the cosmological
constant $\Lambda$. We rely on two battle-tested procedures: (i) We start from
the same null coordinate system used by Bondi and Sachs for $\Lambda = 0$, but,
introduce boundary conditions adapted to allow radiation when $\Lambda>0$. (ii)
We de... | [
{
"created": "Tue, 13 Jun 2023 18:00:01 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Sep 2023 08:45:06 GMT",
"version": "v2"
}
] | 2023-09-11 | [
[
"Bonga",
"Béatrice",
""
],
[
"Bunster",
"Claudio",
""
],
[
"Pérez",
"Alfredo",
""
]
] | We study gravitational radiation for a positive value of the cosmological constant $\Lambda$. We rely on two battle-tested procedures: (i) We start from the same null coordinate system used by Bondi and Sachs for $\Lambda = 0$, but, introduce boundary conditions adapted to allow radiation when $\Lambda>0$. (ii) We dete... |
gr-qc/0209105 | Etera R. Livine | Sergei Alexandrov, Etera R. Livine | SU(2) Loop Quantum Gravity seen from Covariant Theory | LaTeX, 21 pages; a sign mistake corrected | Phys.Rev.D67:044009,2003 | 10.1103/PhysRevD.67.044009 | null | gr-qc hep-th | null | Covariant loop gravity comes out of the canonical analysis of the Palatini
action and the use of the Dirac brackets arising from dealing with the second
class constraints (``simplicity'' constraints). Within this framework, we
underline a quantization ambiguity due to the existence of a family of possible
Lorentz con... | [
{
"created": "Fri, 27 Sep 2002 13:29:10 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Sep 2002 23:41:52 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Oct 2005 13:39:19 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Alexandrov",
"Sergei",
""
],
[
"Livine",
"Etera R.",
""
]
] | Covariant loop gravity comes out of the canonical analysis of the Palatini action and the use of the Dirac brackets arising from dealing with the second class constraints (``simplicity'' constraints). Within this framework, we underline a quantization ambiguity due to the existence of a family of possible Lorentz conne... |
2005.11936 | J\"org Frauendiener | Florian Beyer, J\"org Frauendiener, J\"org Hennig | Explorations of the infinite regions of space-time | final version, consistent with published article | Int. J. Mod. Phys. D, 2030007, (2020) | 10.1142/S0218271820300074 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An important concept in Physics is the notion of an isolated system. It is
used in many different areas to describe the properties of a physical system
which has been isolated from its environment. The interaction with the
`outside' is then usually reduced to a scattering process, in which incoming
radiation interact... | [
{
"created": "Mon, 25 May 2020 06:12:01 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Aug 2020 04:01:13 GMT",
"version": "v2"
}
] | 2020-08-13 | [
[
"Beyer",
"Florian",
""
],
[
"Frauendiener",
"Jörg",
""
],
[
"Hennig",
"Jörg",
""
]
] | An important concept in Physics is the notion of an isolated system. It is used in many different areas to describe the properties of a physical system which has been isolated from its environment. The interaction with the `outside' is then usually reduced to a scattering process, in which incoming radiation interacts ... |
2003.02579 | Vipin Dubey | Vipin Chandra Dubey and Umesh Kumar Sharma | Comparing teh holographic principle inspired dark energy models | 10 pages, 10 figures | null | 10.1016/j.newast.2021.101586 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we use the statefinder parameter diagnostic to the Holographic
principal inspired dark energy models, taking into consideration, the Tsallis
Holographic dark energy (THDE) model, the standard Holographic dark energy
(HDE) model, and the R$\acute{e}$nyi holographic dark energy (RHDE) model. The
evolution... | [
{
"created": "Thu, 5 Mar 2020 12:52:17 GMT",
"version": "v1"
},
{
"created": "Sun, 9 Aug 2020 14:45:54 GMT",
"version": "v2"
}
] | 2021-03-03 | [
[
"Dubey",
"Vipin Chandra",
""
],
[
"Sharma",
"Umesh Kumar",
""
]
] | In this work, we use the statefinder parameter diagnostic to the Holographic principal inspired dark energy models, taking into consideration, the Tsallis Holographic dark energy (THDE) model, the standard Holographic dark energy (HDE) model, and the R$\acute{e}$nyi holographic dark energy (RHDE) model. The evolutionar... |
gr-qc/0409020 | Ali Shojai | Ali Shojai and Fatimah Shojai | Causal Loop Quantum Gravity and Cosmological Solutions | 22 pages, 6 figures | Europhys.Lett. 71 (2005) 886 | 10.1209/epl/i2005-10186-y | null | gr-qc quant-ph | null | We shall present here the causal interpretation of canonical quantum gravity
in terms of new variables. Then we shall apply it to the minisuperspace of
cosmology. A vacuum solution of quantum cosmology is obtained and the Bohmian
trajectory is investigated. At the end a coherent state with matter is
considered in the... | [
{
"created": "Sun, 5 Sep 2004 12:18:18 GMT",
"version": "v1"
},
{
"created": "Sun, 9 Jan 2005 11:47:51 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Sep 2005 16:46:20 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Shojai",
"Ali",
""
],
[
"Shojai",
"Fatimah",
""
]
] | We shall present here the causal interpretation of canonical quantum gravity in terms of new variables. Then we shall apply it to the minisuperspace of cosmology. A vacuum solution of quantum cosmology is obtained and the Bohmian trajectory is investigated. At the end a coherent state with matter is considered in the c... |
0710.3000 | Debashis Gangopadhyay | Debashis Gangopadhyay, R.Bhattacharyya and L. P. Singh | Spacetime Dependent Lagrangians and Electrogravity Duality | 4 pages, latex | Grav.Cosmol.13:285-289,2007 | null | null | gr-qc astro-ph hep-th | null | We apply the spacetime dependent lagrangian formalism [1] to the action in
general relativity. We obtain a Barriola-Vilenkin type monopole solution by
exploiting theelectrogravity duality of the vacuum Einstein equations and using
a modified definition of empty space. An {\it upper bound} is obtained on the
monopole ... | [
{
"created": "Tue, 16 Oct 2007 11:37:42 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Gangopadhyay",
"Debashis",
""
],
[
"Bhattacharyya",
"R.",
""
],
[
"Singh",
"L. P.",
""
]
] | We apply the spacetime dependent lagrangian formalism [1] to the action in general relativity. We obtain a Barriola-Vilenkin type monopole solution by exploiting theelectrogravity duality of the vacuum Einstein equations and using a modified definition of empty space. An {\it upper bound} is obtained on the monopole ma... |
2008.05901 | Remo Garattini | Remo Garattini | Generalized Absurdly Benign Traversable Wormholes powered by Casimir
Energy | revtex4 13 pages | null | 10.1140/epjc/s10052-020-08728-8 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we explore the connection between Casimir energy and an
Absurdly Benign Traversable Wormhole, which in the literature has been
considered only in the pioneering paper of Morris and Thorne. To have
consistency with the Casimir source, we need to generalize the idea of an
Absurdly Benign Traversable Wormh... | [
{
"created": "Wed, 12 Aug 2020 14:01:26 GMT",
"version": "v1"
}
] | 2021-02-03 | [
[
"Garattini",
"Remo",
""
]
] | In this work, we explore the connection between Casimir energy and an Absurdly Benign Traversable Wormhole, which in the literature has been considered only in the pioneering paper of Morris and Thorne. To have consistency with the Casimir source, we need to generalize the idea of an Absurdly Benign Traversable Wormhol... |
gr-qc/0103048 | Yurii Palii | A. M. Khvedelidze, and Yu. G. Palii | Generalized Hamiltonian Dynamics of Friedmann Cosmology with Scalar and
Spinor Matter Source Fields | 18 pages, LaTex, no figures, to appear in Classical and Quantum
Gravity | Class.Quant.Grav. 18 (2001) 1767-1786 | 10.1088/0264-9381/18/9/311 | E2-99-72 | gr-qc | null | The classical and quantum dynamics of the Friedmann-Robertson-Walker Universe
with massless scalar and massive fermion matter field as a source is discussed
in the framework of the Dirac generalized Hamiltonian formalism. The
Hamiltonian reduction of this constrained system is realized for two cases of
minimal and co... | [
{
"created": "Wed, 14 Mar 2001 17:00:03 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Khvedelidze",
"A. M.",
""
],
[
"Palii",
"Yu. G.",
""
]
] | The classical and quantum dynamics of the Friedmann-Robertson-Walker Universe with massless scalar and massive fermion matter field as a source is discussed in the framework of the Dirac generalized Hamiltonian formalism. The Hamiltonian reduction of this constrained system is realized for two cases of minimal and conf... |
0909.3636 | Nicolas Yunes | Nicolas Yunes, C. F. Sopuerta | Testing Effective Quantum Gravity with Gravitational Waves from
Extreme-Mass-Ratio Inspirals | 10 pages, 3 figures, invited article for the Amaldi 8 Proceedings.
Minor changes | J.Phys.Conf.Ser.228:012051,2010 | 10.1088/1742-6596/228/1/012051 | null | gr-qc astro-ph.CO astro-ph.GA astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Testing deviation of GR is one of the main goals of the proposed {\emph{Laser
Interferometer Space Antenna}}, a space-based gravitational-wave observatory.
For the first time, we consistently compute the generation of gravitational
waves from extreme-mass ratio inspirals (stellar compact objects into
supermassive bla... | [
{
"created": "Sun, 20 Sep 2009 15:14:27 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Oct 2009 13:18:22 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Yunes",
"Nicolas",
""
],
[
"Sopuerta",
"C. F.",
""
]
] | Testing deviation of GR is one of the main goals of the proposed {\emph{Laser Interferometer Space Antenna}}, a space-based gravitational-wave observatory. For the first time, we consistently compute the generation of gravitational waves from extreme-mass ratio inspirals (stellar compact objects into supermassive black... |
1102.2870 | Hans Ohanian | Hans C. Ohanian | Reversed Gravitational Acceleration for High-speed Particles | 5 pages, 1 figure. New version includes a "Correction and Addendum"
at end | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Examination of the free-fall motion of particles of extremely high-speed in
the Schwarzschild geometry reveals that the gravitational acceleration of such
particles is reversed when measured in Schwarzschild coordinates. High-speed
particles decelerate when moving radially downward, and they accelerate when
moving up... | [
{
"created": "Mon, 14 Feb 2011 20:03:17 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Nov 2011 03:42:06 GMT",
"version": "v2"
}
] | 2011-11-18 | [
[
"Ohanian",
"Hans C.",
""
]
] | Examination of the free-fall motion of particles of extremely high-speed in the Schwarzschild geometry reveals that the gravitational acceleration of such particles is reversed when measured in Schwarzschild coordinates. High-speed particles decelerate when moving radially downward, and they accelerate when moving upwa... |
gr-qc/0003106 | Walter Simon | Walter Simon | Conformal positive mass theorems | Latex, 9 pages, to appear in Lett. Math. Phys | Lett.Math.Phys. 50 (1999) 275-281 | null | null | gr-qc | null | We show the following two extensions of the standard positive mass theorem
(one for either sign): Let (N,g) and (N,g') be asymptotically flat Riemannian
3-manifolds with compact interior and finite mass, such that g and g' are twice
Hoelder differentiable and related via the conformal rescaling g' = (phi^4).g,
with a... | [
{
"created": "Wed, 29 Mar 2000 18:05:13 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Simon",
"Walter",
""
]
] | We show the following two extensions of the standard positive mass theorem (one for either sign): Let (N,g) and (N,g') be asymptotically flat Riemannian 3-manifolds with compact interior and finite mass, such that g and g' are twice Hoelder differentiable and related via the conformal rescaling g' = (phi^4).g, with a t... |
2207.08479 | Saikat Chakraborty | Simran Arora, Sanjay Mandal, Saikat Chakraborty, Genly Leon, P.K.
Sahoo | Can $f(R)$ gravity isotropize a pre-bounce contracting universe? | 35 pages, 4 figures | Journal of Cosmology and Astroparticle Physics (JCAP), 09 (2022)
042 | 10.1088/1475-7516/2022/09/042 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We address the important issue of isotropisation of a pre-bounce contracting
phase in $f(R)$ gravity, which would be relevant to construct any viable
nonsingular bouncing scenario in $f(R)$ gravity. The main motivation behind
this work is to investigate whether the $f(R)$ gravity, by itself, can
isotropise a contract... | [
{
"created": "Mon, 18 Jul 2022 10:00:34 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Aug 2022 14:07:20 GMT",
"version": "v2"
}
] | 2022-09-16 | [
[
"Arora",
"Simran",
""
],
[
"Mandal",
"Sanjay",
""
],
[
"Chakraborty",
"Saikat",
""
],
[
"Leon",
"Genly",
""
],
[
"Sahoo",
"P. K.",
""
]
] | We address the important issue of isotropisation of a pre-bounce contracting phase in $f(R)$ gravity, which would be relevant to construct any viable nonsingular bouncing scenario in $f(R)$ gravity. The main motivation behind this work is to investigate whether the $f(R)$ gravity, by itself, can isotropise a contractin... |
2406.20070 | Sara Fernandez Uria | David Brizuela, Sara F. Uria | Analytic solutions for the Bianchi I universe coupled to several
barotropic perfect fluids | 13 pages. For a better readability, the previous version
(arXiv:2406.20070v1) has been divided into two independent and
self-consistent papers. The present one contains all the results
corresponding to the Bianchi I model, while arXiv:2407.17307 contains all the
analysis of the Bianchi IX model | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the Bianchi I geometry coupled to several species of comoving
barotropic perfect fluids with a linear equation of state in the context of
general relativity. The solution of the dynamics can be reduced to a
quadrature, which can be explicitly performed in certain cases. In particular,
we obtain the explic... | [
{
"created": "Fri, 28 Jun 2024 17:28:02 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Jul 2024 08:52:40 GMT",
"version": "v2"
}
] | 2024-07-26 | [
[
"Brizuela",
"David",
""
],
[
"Uria",
"Sara F.",
""
]
] | We consider the Bianchi I geometry coupled to several species of comoving barotropic perfect fluids with a linear equation of state in the context of general relativity. The solution of the dynamics can be reduced to a quadrature, which can be explicitly performed in certain cases. In particular, we obtain the explicit... |
0707.2989 | Muhammad Sharif | M. Sharif and Naghmana Tehseen | Conformal Ricci and Matter Collineations for Anisotropic Fluid | 16 pages, accepted for publication in Chinese J. Physics | Chinese J. Phys. 45(2007)592-605 | null | null | gr-qc | null | We study the consequences of timelike and spaccelike conformal Ricci and
conformal matter collineations for anisotropic fluid in the context of General
Relativity. Necessary and sufficient conditions are derived for a spacetime
with anisotropic fluid to admit conformal Ricci and conformal matter
collineations paralle... | [
{
"created": "Fri, 20 Jul 2007 03:34:41 GMT",
"version": "v1"
}
] | 2008-01-12 | [
[
"Sharif",
"M.",
""
],
[
"Tehseen",
"Naghmana",
""
]
] | We study the consequences of timelike and spaccelike conformal Ricci and conformal matter collineations for anisotropic fluid in the context of General Relativity. Necessary and sufficient conditions are derived for a spacetime with anisotropic fluid to admit conformal Ricci and conformal matter collineations parallel ... |
gr-qc/0602057 | Michele Maggiore | Michele Maggiore | Gravitational waves and fundamental physics | 12 pages, 2 figures, to appear in "Sense of Beauty in Physics", a
Volume in honour of the 70th birthday of Adriano Di Giacomo | null | null | null | gr-qc | null | I give an overview of the motivations for gravitational-wave research,
concentrating on the aspects related to ``fundamental'' physics.
| [
{
"created": "Wed, 15 Feb 2006 09:05:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Maggiore",
"Michele",
""
]
] | I give an overview of the motivations for gravitational-wave research, concentrating on the aspects related to ``fundamental'' physics. |
gr-qc/0409047 | Daniel Pollack | Piotr T. Chrusciel, James Isenberg and Daniel Pollack | Gluing Initial Data Sets for General Relativity | Final published version - PRL, 4 pages | Phys.Rev.Lett. 93 (2004) 081101 | 10.1103/PhysRevLett.93.081101 | null | gr-qc math.DG | null | We establish an optimal gluing construction for general relativistic initial
data sets. The construction is optimal in two distinct ways. First, it applies
to generic initial data sets and the required (generically satisfied)
hypotheses are geometrically and physically natural. Secondly, the construction
is completel... | [
{
"created": "Fri, 10 Sep 2004 21:19:58 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Chrusciel",
"Piotr T.",
""
],
[
"Isenberg",
"James",
""
],
[
"Pollack",
"Daniel",
""
]
] | We establish an optimal gluing construction for general relativistic initial data sets. The construction is optimal in two distinct ways. First, it applies to generic initial data sets and the required (generically satisfied) hypotheses are geometrically and physically natural. Secondly, the construction is completely ... |
1503.05208 | David Klein | David Klein and Jake Reschke | Velocity addition formulas in Robertson-Walker spacetimes | 26 pages, 5 figures | J. Math. Phys. 56: 072501 (2015) | 10.1063/1.4926352 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Universal velocity addition formulas analogous to the well-known formula in
special relativity are found for four geometrically defined relative velocities
in a large class of Robertson-Walker spacetimes. Explicit examples are given.
The special relativity result is recovered as a special case, and it is shown
that t... | [
{
"created": "Tue, 17 Mar 2015 20:12:06 GMT",
"version": "v1"
}
] | 2015-07-10 | [
[
"Klein",
"David",
""
],
[
"Reschke",
"Jake",
""
]
] | Universal velocity addition formulas analogous to the well-known formula in special relativity are found for four geometrically defined relative velocities in a large class of Robertson-Walker spacetimes. Explicit examples are given. The special relativity result is recovered as a special case, and it is shown that the... |
1603.03380 | Joel Franklin | J. Franklin, Y. Guo, K. Cole Newton, M. Schlosshauer | The Dynamics of the Schrodinger-Newton System with Self-Field Coupling | Class. Quant. Grav. 33 (7), 2016 | null | 10.1088/0264-9381/33/7/075002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We probe the dynamics of a modified form of the Schrodinger-Newton system of
gravity coupled to single particle quantum mechanics. At the masses of interest
here, the ones associated with the onset of "collapse" (where the gravitational
attraction is competitive with the quantum mechanical dissipation), we show
that ... | [
{
"created": "Thu, 10 Mar 2016 19:15:12 GMT",
"version": "v1"
}
] | 2016-03-23 | [
[
"Franklin",
"J.",
""
],
[
"Guo",
"Y.",
""
],
[
"Newton",
"K. Cole",
""
],
[
"Schlosshauer",
"M.",
""
]
] | We probe the dynamics of a modified form of the Schrodinger-Newton system of gravity coupled to single particle quantum mechanics. At the masses of interest here, the ones associated with the onset of "collapse" (where the gravitational attraction is competitive with the quantum mechanical dissipation), we show that th... |
gr-qc/9406040 | Madhavan Varadarajan | Abhay Ashtekar and Madhavan Varadarajan | A Striking Property of the Gravitational Hamiltonian | 22, CGPG-94/6-3 | Phys.Rev.D50:4944-4956,1994 | 10.1103/PhysRevD.50.4944 | null | gr-qc | null | {\sl A Hamiltonian framework for 2+1 dimensional gravity coupled with matter
(satisfying positive energy conditions) is considered in the asymptotically
flat context. It is shown that the total energy of the system is non-negative,
vanishing if and only if space-time is (globally) Minkowskian. Furthermore,
contrary t... | [
{
"created": "Wed, 22 Jun 1994 19:51:49 GMT",
"version": "v1"
}
] | 2011-04-15 | [
[
"Ashtekar",
"Abhay",
""
],
[
"Varadarajan",
"Madhavan",
""
]
] | {\sl A Hamiltonian framework for 2+1 dimensional gravity coupled with matter (satisfying positive energy conditions) is considered in the asymptotically flat context. It is shown that the total energy of the system is non-negative, vanishing if and only if space-time is (globally) Minkowskian. Furthermore, contrary to ... |
2301.12488 | Giuseppe Gaetano Luciano Dr | Giuseppe Gaetano Luciano | Saez-Ballester gravity in Kantowski-Sachs Universe: a new reconstruction
paradigm for Barrow Holographic Dark Energy | 17 pages, 13 labeled figures, 3 tabs (accepted for publication in
Physics of the Dark Universe) | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We reconstruct Barrow Holographic Dark Energy (BHDE) within the framework of
Saez-Ballester Scalar Tensor Theory. As a specific background, we consider a
homogeneous and anisotropic Kantowski-Sachs Universe filled up with BHDE and
dark matter. By assuming the Hubble radius as an IR cutoff, we investigate both
the cas... | [
{
"created": "Sun, 29 Jan 2023 16:51:29 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Apr 2023 11:21:49 GMT",
"version": "v2"
}
] | 2023-04-18 | [
[
"Luciano",
"Giuseppe Gaetano",
""
]
] | We reconstruct Barrow Holographic Dark Energy (BHDE) within the framework of Saez-Ballester Scalar Tensor Theory. As a specific background, we consider a homogeneous and anisotropic Kantowski-Sachs Universe filled up with BHDE and dark matter. By assuming the Hubble radius as an IR cutoff, we investigate both the cases... |
2101.05496 | Bobir Toshmatov | Bobir Toshmatov, Bobomurat Ahmedov, Daniele Malafarina | Can a light ray distinguish charge of a black hole in nonlinear
electrodynamics? | 6 pages | Phys. Rev. D 103, 024026 (2021) | 10.1103/PhysRevD.103.024026 | null | gr-qc hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | It is a well-known fact that light rays do not follow the null geodesics of
the space-time in nonlinear electrodynamics; instead, they follow the null
geodesics of the so-called effective space-time. Taking this into account, in
this paper, we aim to discuss the possibility of distinguishing the type of
charge with w... | [
{
"created": "Thu, 14 Jan 2021 08:10:24 GMT",
"version": "v1"
}
] | 2021-01-15 | [
[
"Toshmatov",
"Bobir",
""
],
[
"Ahmedov",
"Bobomurat",
""
],
[
"Malafarina",
"Daniele",
""
]
] | It is a well-known fact that light rays do not follow the null geodesics of the space-time in nonlinear electrodynamics; instead, they follow the null geodesics of the so-called effective space-time. Taking this into account, in this paper, we aim to discuss the possibility of distinguishing the type of charge with whi... |
0709.3479 | P. Marecki | G. F. Chapline, P. Marecki | Rotating De Sitter Space | null | null | null | null | gr-qc astro-ph | null | An exact solution of the vacuum Einstein equations with a cosmological
constant is exhibited which can perhaps be used to describe the interior of
compact rotating objects. The physical part of this solution has the topology
of a torus, which may shed light on the origin of highly collimated jets from
compact objects... | [
{
"created": "Fri, 21 Sep 2007 17:01:33 GMT",
"version": "v1"
}
] | 2007-09-24 | [
[
"Chapline",
"G. F.",
""
],
[
"Marecki",
"P.",
""
]
] | An exact solution of the vacuum Einstein equations with a cosmological constant is exhibited which can perhaps be used to describe the interior of compact rotating objects. The physical part of this solution has the topology of a torus, which may shed light on the origin of highly collimated jets from compact objects. |
2408.03961 | Salim Shekh Dr. | N. Myrzakulov, S. H. Shekh, Anirudh Pradhan, and K Ghaderi | Barrow Holographic Dark Energy in f (Q, T) gravity | 11 pages, 7 figures. arXiv admin note: text overlap with
arXiv:2408.00022 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present analysis, we explore a new version of dark energy called
Barrow holographic dark energy within the framework modified gravity called
$f(Q,T)$ gravity by adopting the simple homogeneous, isotropic, and spatially
flat Friedmann-Robertson-Walker (FRW) model of the universe. Our goal is to
understand how t... | [
{
"created": "Thu, 1 Aug 2024 06:01:15 GMT",
"version": "v1"
}
] | 2024-08-09 | [
[
"Myrzakulov",
"N.",
""
],
[
"Shekh",
"S. H.",
""
],
[
"Pradhan",
"Anirudh",
""
],
[
"Ghaderi",
"K",
""
]
] | In the present analysis, we explore a new version of dark energy called Barrow holographic dark energy within the framework modified gravity called $f(Q,T)$ gravity by adopting the simple homogeneous, isotropic, and spatially flat Friedmann-Robertson-Walker (FRW) model of the universe. Our goal is to understand how the... |
gr-qc/0404111 | Mariam Bouhmadi-Lopez | Mariam Bouhmadi-Lopez, Paulo Vargas Moniz | FRW Quantum Cosmology with a Generalized Chaplygin Gas | 13 pages, 3 figures, RevTeX 4 | Phys.Rev. D71 (2005) 063521 | 10.1103/PhysRevD.71.063521 | null | gr-qc | null | Cosmologies with a Chaplygin gas have recently been explored with the
objective of explaining the transition from a dust dominated epoch towards an
accelerating expansion stage. We consider the hypothesis that the transition to
the accelerated period involves a quantum mechanical process. Three physically
admissible ... | [
{
"created": "Tue, 27 Apr 2004 13:06:18 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Bouhmadi-Lopez",
"Mariam",
""
],
[
"Moniz",
"Paulo Vargas",
""
]
] | Cosmologies with a Chaplygin gas have recently been explored with the objective of explaining the transition from a dust dominated epoch towards an accelerating expansion stage. We consider the hypothesis that the transition to the accelerated period involves a quantum mechanical process. Three physically admissible ca... |
1506.03578 | Jianfei Xu | Jianfei Xu, Li-Ming Cao, and Ya-Peng Hu | P-V criticality in the extended phase space of black holes in massive
gravity | 11 pages, 16 figures | Phys. Rev. D 91, 124033 (2015) | 10.1103/PhysRevD.91.124033 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the P-V criticality and phase transition in the extended phase space
of charged anti-de Sitter black holes in canonical ensemble of ghost-free
massive gravity, where the cosmological constant is viewed as a dynamical
pressure of the black hole system. We give the generalized thermodynamic first
law and the S... | [
{
"created": "Thu, 11 Jun 2015 07:58:48 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Jul 2015 02:48:21 GMT",
"version": "v2"
}
] | 2015-07-08 | [
[
"Xu",
"Jianfei",
""
],
[
"Cao",
"Li-Ming",
""
],
[
"Hu",
"Ya-Peng",
""
]
] | We study the P-V criticality and phase transition in the extended phase space of charged anti-de Sitter black holes in canonical ensemble of ghost-free massive gravity, where the cosmological constant is viewed as a dynamical pressure of the black hole system. We give the generalized thermodynamic first law and the Sma... |
gr-qc/0601120 | Rod Aros Mr. | Rodrigo Aros | Charges and the boundary in Chern Simons gravity | Minor changes | Phys.Rev. D73 (2006) 044023 | 10.1103/PhysRevD.73.044023 | GAGC-2006-01 | gr-qc | null | In this work a new set of boundary conditions for Chern Simons gravity that
lead to a fully gauge invariant action is analyzed. This particular form of the
action reproduces the standard results of black hole thermodynamics and
determines that the algebra of charges of diffeomorphisms at the horizon be the
Virasoro a... | [
{
"created": "Fri, 27 Jan 2006 20:24:44 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Mar 2006 18:06:14 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Aros",
"Rodrigo",
""
]
] | In this work a new set of boundary conditions for Chern Simons gravity that lead to a fully gauge invariant action is analyzed. This particular form of the action reproduces the standard results of black hole thermodynamics and determines that the algebra of charges of diffeomorphisms at the horizon be the Virasoro alg... |
1303.1540 | William East | William E. East and Frans Pretorius | Simulating extreme-mass-ratio systems in full general relativity | 6 pages, 5 figures; added one figure, revised to match PRD RC version | Phys. Rev. D 87, 101502(R) (2013) | 10.1103/PhysRevD.87.101502 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a new method for numerically evolving the full Einstein field
equations in situations where the spacetime is dominated by a known background
solution. The technique leverages the knowledge of the background solution to
subtract off its contribution to the truncation error, thereby more efficiently
achiev... | [
{
"created": "Wed, 6 Mar 2013 21:00:48 GMT",
"version": "v1"
},
{
"created": "Sun, 12 May 2013 19:45:14 GMT",
"version": "v2"
}
] | 2013-05-20 | [
[
"East",
"William E.",
""
],
[
"Pretorius",
"Frans",
""
]
] | We introduce a new method for numerically evolving the full Einstein field equations in situations where the spacetime is dominated by a known background solution. The technique leverages the knowledge of the background solution to subtract off its contribution to the truncation error, thereby more efficiently achievin... |
1201.3009 | Balakin Alexander | Alexander B. Balakin, Vladimir V. Bochkarev and Nadezhda O. Tarasova | Gradient models of the axion-photon coupling | 26 pages, 5 figures, accepted for publication in The European
Physical Journal C | Eur. Phys. J. C. (2012) 72: 1895 | 10.1140/epjc/s10052-012-1895-3 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We establish an extended version of the Einstein - Maxwell - axion model by
introducing into the Lagrangian cross-terms, which contain the gradient
four-vector of the pseudoscalar (axion) field in convolution with the Maxwell
tensor. The gradient model of the axion-photon coupling is applied to
cosmology: we analyze ... | [
{
"created": "Sat, 14 Jan 2012 12:16:52 GMT",
"version": "v1"
}
] | 2012-02-21 | [
[
"Balakin",
"Alexander B.",
""
],
[
"Bochkarev",
"Vladimir V.",
""
],
[
"Tarasova",
"Nadezhda O.",
""
]
] | We establish an extended version of the Einstein - Maxwell - axion model by introducing into the Lagrangian cross-terms, which contain the gradient four-vector of the pseudoscalar (axion) field in convolution with the Maxwell tensor. The gradient model of the axion-photon coupling is applied to cosmology: we analyze th... |
1301.0009 | Jarmo M\"akel\"a Dr. | Jarmo M\"akel\"a | Cosmological Constant as a Free Thermodynamical Variable | The version accepted for publication in the Physical Review D. 14
pages, no figures, significant changes to the previous version | Phys. Rev. D 87, 104040 (2013) | 10.1103/PhysRevD.87.104040 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a possibility that the cosmological constant may not be a
constant, but a free thermodynamical variable. To this end we construct a
microscopic model of a spacelike two-sphere just inside of the cosmological
horizon of the de Sitter spacetime. In our model the spacelike two-sphere in
question is assumed t... | [
{
"created": "Mon, 31 Dec 2012 13:49:37 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Jan 2013 10:13:14 GMT",
"version": "v2"
},
{
"created": "Fri, 17 May 2013 07:28:11 GMT",
"version": "v3"
}
] | 2015-06-12 | [
[
"Mäkelä",
"Jarmo",
""
]
] | We consider a possibility that the cosmological constant may not be a constant, but a free thermodynamical variable. To this end we construct a microscopic model of a spacelike two-sphere just inside of the cosmological horizon of the de Sitter spacetime. In our model the spacelike two-sphere in question is assumed to ... |
1501.07330 | Marta Colleoni | Marta Colleoni and Leor Barack | Overspinning a Kerr black hole: the effect of self-force | 25 pages, 4 figures | null | 10.1103/PhysRevD.91.104024 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the scenario in which a massive particle is thrown into a rapidly
rotating Kerr black hole in an attempt to spin it up beyond its extremal limit,
challenging weak cosmic censorship. We work in black-hole perturbation theory,
and focus on non-spinning, uncharged particles sent in on equatorial orbits. We
firs... | [
{
"created": "Thu, 29 Jan 2015 02:03:20 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Colleoni",
"Marta",
""
],
[
"Barack",
"Leor",
""
]
] | We study the scenario in which a massive particle is thrown into a rapidly rotating Kerr black hole in an attempt to spin it up beyond its extremal limit, challenging weak cosmic censorship. We work in black-hole perturbation theory, and focus on non-spinning, uncharged particles sent in on equatorial orbits. We first ... |
gr-qc/0010055 | David Kastor | Jennie Traschen | An Introduction to Black Hole Evaporation | 33 pages, latex. Published in Mathematical Methods of Physics,
proceedings of the 1999 Londrina Winter School, editors A. Bytsenko and F.
Williams, World Scientific (2000) | null | null | null | gr-qc | null | Classical black holes are defined by the property that things can go in, but
don't come out. However, Stephen Hawking calculated that black holes actually
radiate quantum mechanical particles. The two important ingredients that result
in back hole evaporation are (1) the spacetime geometry, in particular the
black ho... | [
{
"created": "Fri, 13 Oct 2000 18:55:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Traschen",
"Jennie",
""
]
] | Classical black holes are defined by the property that things can go in, but don't come out. However, Stephen Hawking calculated that black holes actually radiate quantum mechanical particles. The two important ingredients that result in back hole evaporation are (1) the spacetime geometry, in particular the black hole... |
1808.05826 | Andrea Geralico | Donato Bini, Andrea Geralico | Schwarzschild black hole embedded in a dust field: scattering of
particles and drag force effects | 12 pages, 4 figures; published version | Class. Quantum Grav. 33, 125024 (2016) | 10.1088/0264-9381/33/12/125024 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A "temporal analogue" of the standard Poynting-Robertson effect is analyzed
as induced by a dust of particles (instead of a gas of photons) surrounding a
Schwarzschild black hole. Test particles inside this cloud undergo acceleration
effects due to the presence of a friction force, so that the fate of their
evolution... | [
{
"created": "Fri, 17 Aug 2018 11:09:24 GMT",
"version": "v1"
}
] | 2018-08-20 | [
[
"Bini",
"Donato",
""
],
[
"Geralico",
"Andrea",
""
]
] | A "temporal analogue" of the standard Poynting-Robertson effect is analyzed as induced by a dust of particles (instead of a gas of photons) surrounding a Schwarzschild black hole. Test particles inside this cloud undergo acceleration effects due to the presence of a friction force, so that the fate of their evolution c... |
gr-qc/9812086 | Mamdouh Wanas | F.I.Mikhail and M.I.Wanas | Hamilton's principle and the Generalized Field Theory : A comparative
study | eleven pages latex file, the authors list is shortened | null | null | null | gr-qc | null | The field equations of the generalized field theory (GFT) are derived from an
action principle. A comparison between (GFT), M\o ller's tetrad theory of
gravitation (MTT), and general relativity is carried out regarding the
Lagrangian of each theory. The results of solutions of the field equations, of
each theory, are... | [
{
"created": "Sun, 27 Dec 1998 09:00:37 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mikhail",
"F. I.",
""
],
[
"Wanas",
"M. I.",
""
]
] | The field equations of the generalized field theory (GFT) are derived from an action principle. A comparison between (GFT), M\o ller's tetrad theory of gravitation (MTT), and general relativity is carried out regarding the Lagrangian of each theory. The results of solutions of the field equations, of each theory, are c... |
gr-qc/0003086 | Gaetano Lambiase | S. Capozziello and G. Lambiase | Inertial Effects on Berry's Phase of Neutrino Oscillations | 11 pages, LaTex file, 1 table, to appear in Europ. Phys. J. C | Eur.Phys.J.C16:155-159,2000 | 10.1007/s100520050011 | null | gr-qc | null | The Berry phase of mixed states, as neutrino oscillations, is calculated in a
accelerating and rotating reference frame. It turns out to be depending on the
vacuum mixing angle, the mass--squared difference and on the coupling between
the momentum of the neutrino and the spinorial connection. Berry's phase for
solar ... | [
{
"created": "Wed, 22 Mar 2000 15:42:47 GMT",
"version": "v1"
}
] | 2011-09-13 | [
[
"Capozziello",
"S.",
""
],
[
"Lambiase",
"G.",
""
]
] | The Berry phase of mixed states, as neutrino oscillations, is calculated in a accelerating and rotating reference frame. It turns out to be depending on the vacuum mixing angle, the mass--squared difference and on the coupling between the momentum of the neutrino and the spinorial connection. Berry's phase for solar ne... |
1607.07107 | Vasilis Oikonomou | V.K. Oikonomou | Reconstructing the Universe Evolution from Loop Quantum Cosmology Scalar
Fields | PRD Accepted | null | 10.1103/PhysRevD.94.044004 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the scalar-tensor reconstruction techniques for classical cosmology
frameworks, in the context of loop quantum cosmology. After presenting in some
detail how the equations are generalized in the loop quantum cosmology case, we
discuss which new features and limitations does the quantum framework brings
alon... | [
{
"created": "Sun, 24 Jul 2016 22:41:25 GMT",
"version": "v1"
}
] | 2016-08-24 | [
[
"Oikonomou",
"V. K.",
""
]
] | We extend the scalar-tensor reconstruction techniques for classical cosmology frameworks, in the context of loop quantum cosmology. After presenting in some detail how the equations are generalized in the loop quantum cosmology case, we discuss which new features and limitations does the quantum framework brings along,... |
2208.14890 | Daniel George | Daniel George, Jose Sanjuan, Paul Fulda, Guido Mueller | Calculating the precision of tilt-to-length coupling estimation and
noise subtraction in LISA using Fisher information | null | null | 10.1103/PhysRevD.107.022005 | null | gr-qc astro-ph.IM physics.ins-det | http://creativecommons.org/licenses/by/4.0/ | Tilt-to-length (TTL) noise from angular jitter in LISA is projected to be the
dominant noise source in the milli-Hertz band unless corrected in
post-processing. The correction is only possible after removing the
overwhelming laser phase noise using time-delay interferometry (TDI). We
present here a frequency domain m... | [
{
"created": "Wed, 31 Aug 2022 14:31:19 GMT",
"version": "v1"
}
] | 2023-02-01 | [
[
"George",
"Daniel",
""
],
[
"Sanjuan",
"Jose",
""
],
[
"Fulda",
"Paul",
""
],
[
"Mueller",
"Guido",
""
]
] | Tilt-to-length (TTL) noise from angular jitter in LISA is projected to be the dominant noise source in the milli-Hertz band unless corrected in post-processing. The correction is only possible after removing the overwhelming laser phase noise using time-delay interferometry (TDI). We present here a frequency domain mod... |
1607.05377 | Geoffrey Lovelace | Geoffrey Lovelace, Carlos O. Lousto, James Healy, Mark A. Scheel,
Alyssa Garcia, Richard O'Shaughnessy, Michael Boyle, Manuela Campanelli,
Daniel A. Hemberger, Lawrence E. Kidder, Harald P. Pfeiffer, Bela Szilagyi,
Saul A. Teukolsky, and Yosef Zlochower | Modeling the source of GW150914 with targeted numerical-relativity
simulations | 11 pages, 3 figures, submitted to Classical and Quantum Gravity | Class. Quantum Grav. 33, 244002 (2016) | 10.1088/0264-9381/33/24/244002 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In fall of 2015, the two LIGO detectors measured the gravitational wave
signal GW150914, which originated from a pair of merging black holes. In the
final 0.2 seconds (about 8 gravitational-wave cycles) before the amplitude
reached its maximum, the observed signal swept up in amplitude and frequency,
from 35 Hz to 15... | [
{
"created": "Tue, 19 Jul 2016 02:21:56 GMT",
"version": "v1"
}
] | 2016-11-22 | [
[
"Lovelace",
"Geoffrey",
""
],
[
"Lousto",
"Carlos O.",
""
],
[
"Healy",
"James",
""
],
[
"Scheel",
"Mark A.",
""
],
[
"Garcia",
"Alyssa",
""
],
[
"O'Shaughnessy",
"Richard",
""
],
[
"Boyle",
"Michael",
""
... | In fall of 2015, the two LIGO detectors measured the gravitational wave signal GW150914, which originated from a pair of merging black holes. In the final 0.2 seconds (about 8 gravitational-wave cycles) before the amplitude reached its maximum, the observed signal swept up in amplitude and frequency, from 35 Hz to 150 ... |
1705.06298 | Alex Va\~n\'o-Vi\~nuales | Alex Va\~n\'o-Vi\~nuales and Sascha Husa | Spherical symmetry as a test case for unconstrained hyperboloidal
evolution II: gauge conditions | 35 pages, 5 figures. Version accepted by CQG | null | 10.1088/1361-6382/aaa4e2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present numerical solutions of the hyperboloidal initial value problem for
a self-gravitating scalar field in spherical symmetry, using a variety of
standard hyperbolic slicing and shift conditions that we adapt to our
hyperboloidal setup. We work in the framework of conformal compactification,
and study both evol... | [
{
"created": "Wed, 17 May 2017 18:14:35 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Oct 2017 14:40:20 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Jan 2018 15:19:06 GMT",
"version": "v3"
}
] | 2018-01-17 | [
[
"Vañó-Viñuales",
"Alex",
""
],
[
"Husa",
"Sascha",
""
]
] | We present numerical solutions of the hyperboloidal initial value problem for a self-gravitating scalar field in spherical symmetry, using a variety of standard hyperbolic slicing and shift conditions that we adapt to our hyperboloidal setup. We work in the framework of conformal compactification, and study both evolut... |
gr-qc/9809021 | Carsten Gundlach | C. Gundlach and P. Walke | Causal differencing of flux-conservative equations applied to black hole
spacetimes | 7 pages, RevTex, to appear in CQG | Class.Quant.Grav. 16 (1999) 991-1010 | 10.1088/0264-9381/16/3/026 | null | gr-qc | null | We give a general scheme for finite-differencing partial differential
equations in flux-conservative form to second order, with a stencil that can be
arbitrarily tilted with respect to the numerical grid, parameterized by a
"tilt" vector field gamma^A. This can be used to center the numerical stencil
on the physical ... | [
{
"created": "Fri, 4 Sep 1998 08:49:31 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jan 1999 23:41:25 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Gundlach",
"C.",
""
],
[
"Walke",
"P.",
""
]
] | We give a general scheme for finite-differencing partial differential equations in flux-conservative form to second order, with a stencil that can be arbitrarily tilted with respect to the numerical grid, parameterized by a "tilt" vector field gamma^A. This can be used to center the numerical stencil on the physical li... |
1210.2252 | Alejandro Perez | Amit Ghosh and Alejandro Perez | The scaling of black hole entropy in loop quantum gravity | null | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss some general properties of black hole entropy in loop quantum
gravity from the perspective of local stationary observers at distance l from
the horizon. The present status of the theory indicates that black hole entropy
differs from the low energy (IR) expected value A/(4G) (in natural units) in
the deep P... | [
{
"created": "Mon, 8 Oct 2012 12:00:10 GMT",
"version": "v1"
}
] | 2012-10-09 | [
[
"Ghosh",
"Amit",
""
],
[
"Perez",
"Alejandro",
""
]
] | We discuss some general properties of black hole entropy in loop quantum gravity from the perspective of local stationary observers at distance l from the horizon. The present status of the theory indicates that black hole entropy differs from the low energy (IR) expected value A/(4G) (in natural units) in the deep Pla... |
gr-qc/9306033 | Neil Cornish | N. J. Cornish, J. W. Moffat and D. C. Tatarski | Gravitational Waves from an Axi-symmetric Source in the Nonsymmetric
Gravitational Theory | 15 pages, UTPT-92-17 | Gen.Rel.Grav. 27 (1995) 933 | 10.1007/BF02113075 | null | gr-qc | null | We examine gravitational waves in an isolated axi--symmetric reflexion
symmetric NGT system. The structure of the vacuum field equations is analyzed
and the exact solutions for the field variables in the metric tensor are found
in the form of expansions in powers of a radial coordinate. We find that in the
NGT axiall... | [
{
"created": "Fri, 25 Jun 1993 20:42:23 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Cornish",
"N. J.",
""
],
[
"Moffat",
"J. W.",
""
],
[
"Tatarski",
"D. C.",
""
]
] | We examine gravitational waves in an isolated axi--symmetric reflexion symmetric NGT system. The structure of the vacuum field equations is analyzed and the exact solutions for the field variables in the metric tensor are found in the form of expansions in powers of a radial coordinate. We find that in the NGT axially ... |
1205.6905 | Ivan Arraut | Ivan Arraut | The Planck length as a duality of the Cosmological Constant: S-dS and
S-AdS thermodynamics from a single expression | 17 pages, 3 figures. Improved version. Minor corrections. Typos
corrected | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we suggest that the Planck length $l_{pl}$ and the Cosmological
Constant scale $r_\Lambda=\frac{1}{\sqrt{\Lambda}}$ could in principle be dual
each other if we take seriously the so-called q-Bargmann Fock space
representation as has been previously suggested by Kempf and others and if
additionally we in... | [
{
"created": "Thu, 31 May 2012 07:44:45 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Sep 2012 16:16:15 GMT",
"version": "v2"
},
{
"created": "Mon, 10 Sep 2012 13:37:50 GMT",
"version": "v3"
}
] | 2012-09-11 | [
[
"Arraut",
"Ivan",
""
]
] | In this paper we suggest that the Planck length $l_{pl}$ and the Cosmological Constant scale $r_\Lambda=\frac{1}{\sqrt{\Lambda}}$ could in principle be dual each other if we take seriously the so-called q-Bargmann Fock space representation as has been previously suggested by Kempf and others and if additionally we intr... |
1203.3762 | Shahram Jalalzadeh | A. M. Yazdani, S. Jalalzadeh and K. Atazadeh | Localization of gravity in brane world with arbitrary extra dimensions | 8 pages. arXiv admin note: substantial text overlap with
arXiv:gr-qc/0408004, arXiv:gr-qc/0607067, arXiv:0704.1035, arXiv:0707.3558,
arXiv:0710.2666 | Int J Theor Phys (2011) 50: 888 | 10.1007/s10773-010-0630-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the induced 4-dimensional linearized Einstein field equations in an
m-dimensional bulk space by means of a confining potential. It is shown that in
this approach the mass of graviton is quantized. The cosmological constant
problem is also addressed within the context of this approach. We show that the
differ... | [
{
"created": "Fri, 16 Mar 2012 16:43:44 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Sep 2012 15:14:59 GMT",
"version": "v2"
}
] | 2012-09-18 | [
[
"Yazdani",
"A. M.",
""
],
[
"Jalalzadeh",
"S.",
""
],
[
"Atazadeh",
"K.",
""
]
] | We study the induced 4-dimensional linearized Einstein field equations in an m-dimensional bulk space by means of a confining potential. It is shown that in this approach the mass of graviton is quantized. The cosmological constant problem is also addressed within the context of this approach. We show that the differen... |
2408.02351 | Orlando Luongo | Alessio Lapponi, Orlando Luongo, Stefano Mancini | How cosmological expansion affects communication between distant quantum
systems | 22 pages, 4 figures | null | null | null | gr-qc astro-ph.CO quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A quantum communication protocol between harmonic oscillator detectors,
interacting with a quantum field, is developed in a cosmological expanding
background. The aim is to see if the quantum effects arising in an expanding
universe, such as the cosmological particle production, could facilitate the
communication bet... | [
{
"created": "Mon, 5 Aug 2024 09:59:27 GMT",
"version": "v1"
}
] | 2024-08-06 | [
[
"Lapponi",
"Alessio",
""
],
[
"Luongo",
"Orlando",
""
],
[
"Mancini",
"Stefano",
""
]
] | A quantum communication protocol between harmonic oscillator detectors, interacting with a quantum field, is developed in a cosmological expanding background. The aim is to see if the quantum effects arising in an expanding universe, such as the cosmological particle production, could facilitate the communication betwe... |
2302.04995 | Roxana Rosca-Mead | Roxana Rosca-Mead, Michalis Agathos, Christopher J. Moore and Ulrich
Sperhake | Stochastic gravitational wave background from supernovae in massive
scalar-tensor gravity | to match published version in Phys.Rev.D | Phys.Rev.D 107 (2023) 12, 124040 | 10.1103/PhysRevD.107.124040 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In massive scalar-tensor gravity, core-collapse supernovae are strong sources
of scalar-polarized gravitational waves. These can be detectable out to large
distance. The dispersive nature of the propagation of waves in the massive
scalar field mean the gravitational wave signals are long lived and many such
signals c... | [
{
"created": "Fri, 10 Feb 2023 00:43:18 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Jul 2023 12:22:23 GMT",
"version": "v2"
}
] | 2023-07-10 | [
[
"Rosca-Mead",
"Roxana",
""
],
[
"Agathos",
"Michalis",
""
],
[
"Moore",
"Christopher J.",
""
],
[
"Sperhake",
"Ulrich",
""
]
] | In massive scalar-tensor gravity, core-collapse supernovae are strong sources of scalar-polarized gravitational waves. These can be detectable out to large distance. The dispersive nature of the propagation of waves in the massive scalar field mean the gravitational wave signals are long lived and many such signals can... |
gr-qc/0106073 | Johannes Ruoff | Johannes Ruoff and Kostas D. Kokkotas | On the r-mode spectrum of relativistic stars: Inclusion of the radiation
reaction | 9 pages, 6 figures, MNRAS type setting | Mon.Not.Roy.Astron.Soc.330:1027,2002 | 10.1046/j.1365-8711.2002.05169.x | null | gr-qc astro-ph | null | We consider both mode calculations and time evolutions of axial r-modes for
relativistic uniformly rotating non-barotropic neutron stars, using the
slow-rotation formalism, in which rotational corrections are considered up to
linear order in the angular velocity \Omega. We study various stellar models,
such as unifor... | [
{
"created": "Fri, 22 Jun 2001 16:25:40 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Ruoff",
"Johannes",
""
],
[
"Kokkotas",
"Kostas D.",
""
]
] | We consider both mode calculations and time evolutions of axial r-modes for relativistic uniformly rotating non-barotropic neutron stars, using the slow-rotation formalism, in which rotational corrections are considered up to linear order in the angular velocity \Omega. We study various stellar models, such as uniform ... |
1205.6957 | Tahereh Azizi | Tahereh Azizi | Wormhole Geometries In $f(R,T)$ Gravity | 9 pages, 4 figures, published version, references added | Int J Theo Phys 52:3486-3493, 2013 | 10.1007/s10773-013-1650-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study wormhole solutions in the framework of f (R,T) gravity where R is
the scalar curvature, and T is the trace of the stress-energy tensor of the
matter. We have obtained the shape function of the wormhole by specifying an
equation of state for the matter field and imposing the flaring out condition
at the throa... | [
{
"created": "Thu, 31 May 2012 10:56:15 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jan 2014 02:41:23 GMT",
"version": "v2"
}
] | 2014-01-30 | [
[
"Azizi",
"Tahereh",
""
]
] | We study wormhole solutions in the framework of f (R,T) gravity where R is the scalar curvature, and T is the trace of the stress-energy tensor of the matter. We have obtained the shape function of the wormhole by specifying an equation of state for the matter field and imposing the flaring out condition at the throat.... |
gr-qc/9907010 | Roberto A. Sussman | Roberto A. Sussman and Diego Pavon | Exact inhomogeneous cosmologies whose source is a radiation-matter
mixture with consistent thermodynamics | LaTeX with revtex (PRD macros). Contains 9 figures (ps). To be
published in Physics Review D | Phys.Rev.D60:104023,1999 | 10.1103/PhysRevD.60.104023 | null | gr-qc astro-ph cond-mat.stat-mech physics.plasm-ph | null | We derive a new class of exact solutions of Einstein's equations providing a
physically plausible hydrodynamical description of cosmological matter in the
radiative era ($10^6 K > T > 10^3 K$), between nucleosynthesis and decoupling.
The solutions are characterized by the Lema\^{\i}tre-Tolman -Bondi metric with
a vis... | [
{
"created": "Sun, 4 Jul 1999 18:30:03 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Sussman",
"Roberto A.",
""
],
[
"Pavon",
"Diego",
""
]
] | We derive a new class of exact solutions of Einstein's equations providing a physically plausible hydrodynamical description of cosmological matter in the radiative era ($10^6 K > T > 10^3 K$), between nucleosynthesis and decoupling. The solutions are characterized by the Lema\^{\i}tre-Tolman -Bondi metric with a visco... |
gr-qc/0110063 | J. Ponce de Leon | J. Ponce de Leon | Does The Force From an Extra Dimension Contradict Physics in 4D? | Minor addition in the Introduction to match the version to appear in
Phys. Lett. B | Phys.Lett. B523 (2001) 311-316 | 10.1016/S0370-2693(01)01349-1 | null | gr-qc | null | We examine the question of whether violation of 4D physics is an inevitable
consequence of existence of an extra non-compactified dimension. Recent
investigations in membrane and Kaluza-Klein theory indicate that when the
metric of the spacetime is allowed to depend on the extra coordinate, i.e., the
cilindricity con... | [
{
"created": "Sat, 13 Oct 2001 05:56:49 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Nov 2001 17:10:51 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"de Leon",
"J. Ponce",
""
]
] | We examine the question of whether violation of 4D physics is an inevitable consequence of existence of an extra non-compactified dimension. Recent investigations in membrane and Kaluza-Klein theory indicate that when the metric of the spacetime is allowed to depend on the extra coordinate, i.e., the cilindricity condi... |
2005.03489 | Shahar Hod | Shahar Hod | No hair for spherically symmetric neutral reflecting stars: nonminimally
coupled massive scalar fields | 7 pages. arXiv admin note: text overlap with arXiv:2002.05903,
arXiv:1709.01933 | Physics Letters B 773, 208 (2017) | 10.1016/j.physletb.2017.08.033 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent no-hair theorems have revealed the intriguing fact that horizonless
stars with compact reflecting surfaces {\it cannot} support non-linear matter
configurations made of scalar, vector, and tensor fields. In the present paper
we extend the regime of validity of these no-hair theorems by explicitly
proving that ... | [
{
"created": "Wed, 6 May 2020 03:48:18 GMT",
"version": "v1"
}
] | 2020-05-13 | [
[
"Hod",
"Shahar",
""
]
] | Recent no-hair theorems have revealed the intriguing fact that horizonless stars with compact reflecting surfaces {\it cannot} support non-linear matter configurations made of scalar, vector, and tensor fields. In the present paper we extend the regime of validity of these no-hair theorems by explicitly proving that sp... |
1601.06309 | S. I. Kruglov | S.I. Kruglov | Universe acceleration and nonlinear electrodynamics | 12 pages, 1 figure | Phys. Rev. D92 (2015) 12, 123523 | 10.1103/PhysRevD.92.123523 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new model of nonlinear electrodynamics with a dimensional parameter $\beta$
coupled to gravity is considered. We show that an accelerated expansion of the
universe takes place if the nonlinear electromagnetic field is the source of
the gravitational field. A pure magnetic universe is investigated and the
magnetic f... | [
{
"created": "Sat, 23 Jan 2016 20:56:43 GMT",
"version": "v1"
}
] | 2016-01-26 | [
[
"Kruglov",
"S. I.",
""
]
] | A new model of nonlinear electrodynamics with a dimensional parameter $\beta$ coupled to gravity is considered. We show that an accelerated expansion of the universe takes place if the nonlinear electromagnetic field is the source of the gravitational field. A pure magnetic universe is investigated and the magnetic fie... |
gr-qc/9906086 | Pascual-Sanchez J.-F. | J.-F. Pascual-S\'anchez | On the (non) existence of several gravitomagnetic effects | LaTex, 5 pages, to be published in "Gravitation and Relativity in
General", eds. A. Molina, J. Mart\'in, E. Ruiz, F. Atrio (World Scientific,
1999) | null | null | null | gr-qc | null | Due to the resemblance between Maxwell and the gravitomagnetic equations
obtained in the weak field and slow motion limit of General Relativity, one can
ask if it is possible to amplify a seed intrinsic rotation or spin motion by a
gravitomagetic dynamo, in analogy with the well-known dynamo effect. Using the
Galilea... | [
{
"created": "Sun, 20 Jun 1999 17:30:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pascual-Sánchez",
"J. -F.",
""
]
] | Due to the resemblance between Maxwell and the gravitomagnetic equations obtained in the weak field and slow motion limit of General Relativity, one can ask if it is possible to amplify a seed intrinsic rotation or spin motion by a gravitomagetic dynamo, in analogy with the well-known dynamo effect. Using the Galilean ... |
1601.06831 | Marko Vojinovic | Nikola Paunkovi\'c and Marko Vojinovi\'c | Gravity-Matter Entanglement in Regge Quantum Gravity | Proceedings of the EmQM15 conference, to appear in J. Phys. Conf.
Ser. 2 pages | J. Phys.: Conf. Ser. 701, 012035 (2016) | 10.1088/1742-6596/701/1/012035 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that Hartle-Hawking states in the Regge quantum gravity model
generically contain non-trivial entanglement between gravity and matter fields.
Generic impossibility to talk about "matter in a point of space" is in line
with the idea of an emergent spacetime, and as such could be taken as a
possible candidate ... | [
{
"created": "Fri, 22 Jan 2016 18:00:12 GMT",
"version": "v1"
}
] | 2016-04-05 | [
[
"Paunković",
"Nikola",
""
],
[
"Vojinović",
"Marko",
""
]
] | We argue that Hartle-Hawking states in the Regge quantum gravity model generically contain non-trivial entanglement between gravity and matter fields. Generic impossibility to talk about "matter in a point of space" is in line with the idea of an emergent spacetime, and as such could be taken as a possible candidate fo... |
2110.01338 | Maria Petronikolou | Maria Petronikolou, Spyros Basilakos, Emmanuel N. Saridakis | Alleviating $H_0$ tension in Horndeski gravity | 9 pages, 8 figures, to appear in Phys.Rev.D | null | 10.1103/PhysRevD.106.124051 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the $H_0$ tension can be alleviated in the framework of
Horndeski/generalized galileon gravity. In particular, since the terms
depending on $G_5$ control the friction in the Friedmann equation, we construct
specific sub-classes in which it depends only on the field's kinetic energy.
Since the latter is s... | [
{
"created": "Mon, 4 Oct 2021 11:35:14 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Dec 2022 11:38:59 GMT",
"version": "v2"
}
] | 2023-01-11 | [
[
"Petronikolou",
"Maria",
""
],
[
"Basilakos",
"Spyros",
""
],
[
"Saridakis",
"Emmanuel N.",
""
]
] | We show that the $H_0$ tension can be alleviated in the framework of Horndeski/generalized galileon gravity. In particular, since the terms depending on $G_5$ control the friction in the Friedmann equation, we construct specific sub-classes in which it depends only on the field's kinetic energy. Since the latter is sma... |
1208.5249 | Vyacheslav Ivanovich Dokuchaev | V. I. Dokuchaev and S. V. Chernov | Possible types of the evolution of vacuum shells around the de Sitter
space | 3 pages, 1 figure | JETP Lett.85:595-597,2007; Pisma Zh.Eksp.Teor.Fiz.85:727-729,2007 | 10.1134/S0021364007120016 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | All possible evolution scenarios of a thin vacuum shell surrounding the
spherically symmetric de Sitter space have been determined and the
corresponding global geometries have been constructed. Such configurations can
appear at the final stage of the cosmological phase transition, when isolated
regions (islands) of t... | [
{
"created": "Sun, 26 Aug 2012 20:28:50 GMT",
"version": "v1"
}
] | 2012-08-28 | [
[
"Dokuchaev",
"V. I.",
""
],
[
"Chernov",
"S. V.",
""
]
] | All possible evolution scenarios of a thin vacuum shell surrounding the spherically symmetric de Sitter space have been determined and the corresponding global geometries have been constructed. Such configurations can appear at the final stage of the cosmological phase transition, when isolated regions (islands) of the... |
1102.3130 | Etera R. Livine | Mait\'e Dupuis, Etera R. Livine | Boundary State Stability under Spinfoam Evolution for the Quantum
4-Simplex | 17 pages | Class. Quant. Grav. 28 (2011) 215002 | 10.1088/0264-9381/28/21/215002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the spinfoam framework for quantum gravity, we investigate the conditions
to have a physical quantum state for the Barrett-Crane model for the 4d quantum
gravity path integral. More precisely, we look at the simplest case of a single
4-simplex boundary and show that the requirement of working with a physical
bound... | [
{
"created": "Tue, 15 Feb 2011 17:23:35 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Nov 2011 16:54:50 GMT",
"version": "v2"
}
] | 2015-05-27 | [
[
"Dupuis",
"Maité",
""
],
[
"Livine",
"Etera R.",
""
]
] | In the spinfoam framework for quantum gravity, we investigate the conditions to have a physical quantum state for the Barrett-Crane model for the 4d quantum gravity path integral. More precisely, we look at the simplest case of a single 4-simplex boundary and show that the requirement of working with a physical boundar... |
2004.01524 | Renata Jora | Renata Jora | Unimodular gauge fixing in general relativity revisited | 3 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a slight variation of the unimodular gauge condition which we call
"the derivative gauge condition". We show that at the classical level these
conditions are completely equivalent up to a surface term. At the quantum level
the derivative gauge condition can be easily implemented by analogy with gauge
fixing ... | [
{
"created": "Wed, 1 Apr 2020 13:56:51 GMT",
"version": "v1"
}
] | 2020-04-06 | [
[
"Jora",
"Renata",
""
]
] | We study a slight variation of the unimodular gauge condition which we call "the derivative gauge condition". We show that at the classical level these conditions are completely equivalent up to a surface term. At the quantum level the derivative gauge condition can be easily implemented by analogy with gauge fixing in... |
0809.3570 | Arturo Stabile | Arturo Stabile | The Weak Field Limit of Higher Order Gravity | PhD thesis (Supervisors: Salvatore Capozziello, Gaetano Scarpetta),
180 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Higher Order Theories of Gravity - $f(R, R_{\alpha\beta}R^{\alpha\beta})$
- theory, where $R$ is the Ricci scalar, $R_{\alpha\beta}$ is the Ricci tensor
and $f$ is any analytic function - have recently attracted a lot of interest as
alternative candidates to explain the observed cosmic acceleration, the
flatness ... | [
{
"created": "Sun, 21 Sep 2008 10:48:36 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Feb 2010 23:57:20 GMT",
"version": "v2"
}
] | 2010-02-07 | [
[
"Stabile",
"Arturo",
""
]
] | The Higher Order Theories of Gravity - $f(R, R_{\alpha\beta}R^{\alpha\beta})$ - theory, where $R$ is the Ricci scalar, $R_{\alpha\beta}$ is the Ricci tensor and $f$ is any analytic function - have recently attracted a lot of interest as alternative candidates to explain the observed cosmic acceleration, the flatness of... |
1305.3421 | Markus B. Fr\"ob | Markus B. Fr\"ob, Atsushi Higuchi | Mode-sum construction of the two-point functions for the Stueckelberg
vector fields in the Poincar\'e patch of de Sitter space | 23 pages, matches published version | J. Math. Phys. 55, 062301 (2014) | 10.1063/1.4879496 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform canonical quantization of the Stueckelberg Lagrangian for massive
vector fields in the conformally flat patch of de Sitter space in the
Bunch-Davies vacuum and find their Wightman two-point functions by the mode-sum
method. We discuss the zero-mass limit of these two-point functions and their
limits where ... | [
{
"created": "Wed, 15 May 2013 10:31:04 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Jun 2014 19:12:41 GMT",
"version": "v2"
}
] | 2014-06-04 | [
[
"Fröb",
"Markus B.",
""
],
[
"Higuchi",
"Atsushi",
""
]
] | We perform canonical quantization of the Stueckelberg Lagrangian for massive vector fields in the conformally flat patch of de Sitter space in the Bunch-Davies vacuum and find their Wightman two-point functions by the mode-sum method. We discuss the zero-mass limit of these two-point functions and their limits where th... |
1304.2926 | Farhad Darabi | F. Darabi, K. Atazadeh, A. Rezaei-Aghdam | Generalized (2+1) dimensional black hole by Noether symmetry | 13 pages, major revision, title change | Eur. Phys. J. C, 73:2657 (2013) | 10.1140/epjc/s10052-013-2657-6 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the Noether symmetry approach to find $f(R)$ theory of $(2+1)$
dimensional gravity and $(2+1)$ dimensional black hole solution consistent with
this $f(R)$ gravity and the associated symmetry. We obtain $f({R})=D_1
R({n}/{n+1})({R}/{K})^{1/n}+D_2 R+D_3$, where the constant term $D_3$ plays no
dynamical role. Th... | [
{
"created": "Wed, 10 Apr 2013 12:18:24 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Jul 2013 16:24:48 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Aug 2013 21:16:04 GMT",
"version": "v3"
}
] | 2015-06-15 | [
[
"Darabi",
"F.",
""
],
[
"Atazadeh",
"K.",
""
],
[
"Rezaei-Aghdam",
"A.",
""
]
] | We use the Noether symmetry approach to find $f(R)$ theory of $(2+1)$ dimensional gravity and $(2+1)$ dimensional black hole solution consistent with this $f(R)$ gravity and the associated symmetry. We obtain $f({R})=D_1 R({n}/{n+1})({R}/{K})^{1/n}+D_2 R+D_3$, where the constant term $D_3$ plays no dynamical role. Then... |
1708.04715 | Mauricio Cataldo MC | Mauricio Cataldo and Fabian Orellana | Static phantom wormholes of finite size | To be published in Physical Review D; 9 pages; 8 figures | null | 10.1103/PhysRevD.96.064022 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we derive new static phantom traversable wormholes by assuming
a shape function with a quadratic dependence on the radial coordinate r. We
mainly focus our study on wormholes sustained by exotic matter with positive
energy density (as seen by any static observer) and a variable equation of
state $p_r/\r... | [
{
"created": "Tue, 15 Aug 2017 23:01:53 GMT",
"version": "v1"
}
] | 2017-10-11 | [
[
"Cataldo",
"Mauricio",
""
],
[
"Orellana",
"Fabian",
""
]
] | In this paper we derive new static phantom traversable wormholes by assuming a shape function with a quadratic dependence on the radial coordinate r. We mainly focus our study on wormholes sustained by exotic matter with positive energy density (as seen by any static observer) and a variable equation of state $p_r/\rho... |
1610.04462 | Giorgio Immirzi | Giorgio Immirzi | Causal spin foams | 7 pages, 1 figure; rewritten, perhaps improved | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I discuss how to impose causality on spin-foam models, separating forward and
backward propagation, turning a given triangulation to a 'causal set', and
giving asymptotically the exponential of the Regge action, not a cosine. I show
the equivalence of the prescriptions which have been proposed to achieve this.
Essent... | [
{
"created": "Fri, 14 Oct 2016 13:49:41 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Apr 2017 21:28:06 GMT",
"version": "v2"
}
] | 2017-05-02 | [
[
"Immirzi",
"Giorgio",
""
]
] | I discuss how to impose causality on spin-foam models, separating forward and backward propagation, turning a given triangulation to a 'causal set', and giving asymptotically the exponential of the Regge action, not a cosine. I show the equivalence of the prescriptions which have been proposed to achieve this. Essentia... |
1801.07133 | Denitsa Staicova | Denitsa Staicova and Michail Stoilov | Cosmological solutions from models with unified dark energy and dark
matter and with inflaton field | 10 pages, 4 figures, prepared for the Proceedings of the XII.
International Workshop Lie Theory And Its Applications In Physics (2017) | Dobrev V. (eds) Quantum Theory and Symmetries with Lie Theory and
Its Applications in Physics Vol. 2. LT-XII/QTS-X 2017. Springer Proceedings
in Mathematics & Statistics, vol 255 | 10.1007/978-981-13-2179-5_19 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, few cosmological models with additional non-Riemannian volume
form(s) have been proposed. In this article we use Supernovae type Ia
experimental data to test one of these models which provides a unified
description of both dark energy via dynamically generated cosmological constant
and dark matter as a "dus... | [
{
"created": "Mon, 22 Jan 2018 15:19:32 GMT",
"version": "v1"
},
{
"created": "Fri, 18 May 2018 17:15:05 GMT",
"version": "v2"
}
] | 2018-10-05 | [
[
"Staicova",
"Denitsa",
""
],
[
"Stoilov",
"Michail",
""
]
] | Recently, few cosmological models with additional non-Riemannian volume form(s) have been proposed. In this article we use Supernovae type Ia experimental data to test one of these models which provides a unified description of both dark energy via dynamically generated cosmological constant and dark matter as a "dust"... |
gr-qc/9508037 | Alejandro Corichi | Alejandro Corichi and Michael P. Ryan, Jr | Quantization of Nonstandard Hamiltonian Systems | Revtex file, 23 pages, no figures | J.Phys.A30:3553-3572,1997 | 10.1088/0305-4470/30/10/029 | CGPG-95/8-5 | gr-qc quant-ph | null | The quantization of classical theories that admit more than one Hamiltonian
description is considered. This is done from a geometrical viewpoint, both at
the quantization level (geometric quantization) and at the level of the
dynamics of the quantum theory. A spin-1/2 system is taken as an example in
which all the st... | [
{
"created": "Tue, 15 Aug 1995 18:16:49 GMT",
"version": "v1"
}
] | 2012-08-27 | [
[
"Corichi",
"Alejandro",
""
],
[
"Ryan,",
"Michael P.",
"Jr"
]
] | The quantization of classical theories that admit more than one Hamiltonian description is considered. This is done from a geometrical viewpoint, both at the quantization level (geometric quantization) and at the level of the dynamics of the quantum theory. A spin-1/2 system is taken as an example in which all the step... |
gr-qc/0611120 | Lorenzo Iorio | Lorenzo Iorio | Dynamical constraints on some orbital and physical properties of the
WD0137-349 A/B binary system | LaTex2e, 11 pages, 3 figures, no tables. It refers to gr-qc/0611126
and better clarify the result obtained there. Accepted by Astrophysics and
Space Science | Astrophys.SpaceSci.312:337-341,2007 | 10.1007/s10509-007-9701-7 | null | gr-qc astro-ph nucl-th physics.space-ph | null | In this paper I deal with the WD0137-349 binary system consisting of a white
dwarf (WD) and a brown dwarf (BD) in a close circular orbit of about 116 min.
I, first, constrain the admissible range of values for the inclination i by
noting that, from looking for deviations from the third Kepler law, the
quadrupole mass... | [
{
"created": "Wed, 22 Nov 2006 22:12:06 GMT",
"version": "v1"
},
{
"created": "Sat, 31 Mar 2007 19:31:35 GMT",
"version": "v2"
},
{
"created": "Fri, 1 Jun 2007 15:46:41 GMT",
"version": "v3"
},
{
"created": "Sun, 3 Jun 2007 13:29:50 GMT",
"version": "v4"
},
{
"cre... | 2008-11-26 | [
[
"Iorio",
"Lorenzo",
""
]
] | In this paper I deal with the WD0137-349 binary system consisting of a white dwarf (WD) and a brown dwarf (BD) in a close circular orbit of about 116 min. I, first, constrain the admissible range of values for the inclination i by noting that, from looking for deviations from the third Kepler law, the quadrupole mass m... |
0807.2792 | Gonzalo Garc\'ia-Reyes | Gonzalo Garc\'ia-Reyes and Guillermo A. Gonz\'alez | Electrovacuum Static Counterrotating Relativistic Dust Disks | 19 pages, 16 figures, revtex4 | Phys.Rev.D69:124002,2004 | 10.1103/PhysRevD.69.124002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A detailed study is presented of the counterrotating model (CRM) for generic
electrovacuum static axially symmetric relativistic thin disks without radial
pressure. We find a general constraint over the counterrotating tangential
velocities needed to cast the surface energy-momentum tensor of the disk as the
superpos... | [
{
"created": "Thu, 17 Jul 2008 14:32:02 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"García-Reyes",
"Gonzalo",
""
],
[
"González",
"Guillermo A.",
""
]
] | A detailed study is presented of the counterrotating model (CRM) for generic electrovacuum static axially symmetric relativistic thin disks without radial pressure. We find a general constraint over the counterrotating tangential velocities needed to cast the surface energy-momentum tensor of the disk as the superposit... |
gr-qc/0412026 | David Coule | D.H. Coule | Quantum Cosmological Models | revised: now includes time asymmetry, black hole final state etc, 71
pages | Class.Quant.Grav.22:R125-2308,2005 | 10.1088/0264-9381/22/12/R02 | null | gr-qc hep-th | null | We contrast the initial condition requirements of various contemporary
cosmological models, including inflationary and bouncing cosmologies. Various
proposals such as Hartle-Hawking's no boundary, or Tunnelling boundary
conditions are assessed on grounds of naturalness and fine tuning.
Alternatively a quiescent or ``... | [
{
"created": "Mon, 6 Dec 2004 17:49:11 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Dec 2004 17:33:36 GMT",
"version": "v2"
},
{
"created": "Tue, 3 May 2005 15:12:11 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Coule",
"D. H.",
""
]
] | We contrast the initial condition requirements of various contemporary cosmological models, including inflationary and bouncing cosmologies. Various proposals such as Hartle-Hawking's no boundary, or Tunnelling boundary conditions are assessed on grounds of naturalness and fine tuning. Alternatively a quiescent or ``ti... |
2103.15312 | Snehasish Bhattacharjee | Snehasish Bhattacharjee | Baryogenesis in $f(P)$ Gravity | null | International Journal of Modern Physics A 36, 27, 2150200 (2021) | 10.1142/S0217751X21502006 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | In this work, we investigate gravitational baryogenesis in the framework of
$f(P)$ gravity to understand the applicability of this class of modified
gravity in addressing the baryon asymmetry of the Universe. For the analysis,
we set $f(P) = \alpha P$ where $\alpha$ is the model parameter. We found that
in $f(P)$ gra... | [
{
"created": "Mon, 29 Mar 2021 03:42:40 GMT",
"version": "v1"
},
{
"created": "Sat, 20 Nov 2021 11:57:11 GMT",
"version": "v2"
}
] | 2021-11-23 | [
[
"Bhattacharjee",
"Snehasish",
""
]
] | In this work, we investigate gravitational baryogenesis in the framework of $f(P)$ gravity to understand the applicability of this class of modified gravity in addressing the baryon asymmetry of the Universe. For the analysis, we set $f(P) = \alpha P$ where $\alpha$ is the model parameter. We found that in $f(P)$ gravi... |
2103.06955 | Slava G. Turyshev | Slava G. Turyshev, Viktor T. Toth | Optical properties of an extended gravitational lens | 25 pages, 10 figures | Phys. Rev. D 104, 024019 (2021) | 10.1103/PhysRevD.104.024019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We continue to study the optical properties of the solar gravitational lens
(SGL). The aim is prospective applications of the SGL for imaging purposes. We
investigate the solution of Maxwell's equations for the electromagnetic (EM)
field, obtained on the background of a static gravitational field of the Sun.
We now t... | [
{
"created": "Thu, 11 Mar 2021 21:11:12 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Jun 2021 17:39:24 GMT",
"version": "v2"
}
] | 2021-07-08 | [
[
"Turyshev",
"Slava G.",
""
],
[
"Toth",
"Viktor T.",
""
]
] | We continue to study the optical properties of the solar gravitational lens (SGL). The aim is prospective applications of the SGL for imaging purposes. We investigate the solution of Maxwell's equations for the electromagnetic (EM) field, obtained on the background of a static gravitational field of the Sun. We now tre... |
1407.2085 | Jonathan R. Gair | Jonathan R. Gair | The scientific potential of space-based gravitational wave detectors | 18 pages, 2 figures, contribution to Gravitational Wave Astrophysics,
the proceedings of the 2014 Sant Cugat Forum on Astrophysics; v2 includes one
additional reference | null | 10.1007/978-3-319-10488-1_20 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The millihertz gravitational wave band can only be accessed with a
space-based interferometer, but it is one of the richest in potential sources.
Observations in this band have amazing scientific potential. The mergers
between massive black holes with mass in the range 10 thousand to 10 million
solar masses, which ar... | [
{
"created": "Tue, 8 Jul 2014 13:57:38 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Aug 2014 10:01:49 GMT",
"version": "v2"
}
] | 2015-06-22 | [
[
"Gair",
"Jonathan R.",
""
]
] | The millihertz gravitational wave band can only be accessed with a space-based interferometer, but it is one of the richest in potential sources. Observations in this band have amazing scientific potential. The mergers between massive black holes with mass in the range 10 thousand to 10 million solar masses, which are ... |
0801.4797 | Nikodem Poplawski | Nikodem J. Poplawski | Geometrization of electromagnetism in tetrad-spin-connection gravity | 8 pages; published version | Mod. Phys. Lett.A24:431-442, 2009; Erratum-ibid.A26:1243,2011 | 10.1142/S0217732309030151 10.1142/S0217732311036024 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The metric-affine Lagrangian of Ponomarev and Obukhov for the unified
gravitational and electromagnetic field is linear in the Ricci scalar and
quadratic in the tensor of homothetic curvature. We apply to this Lagrangian
the variational principle with the tetrad and spin connection as dynamical
variables and show tha... | [
{
"created": "Wed, 30 Jan 2008 23:30:00 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Apr 2009 15:49:23 GMT",
"version": "v2"
},
{
"created": "Sat, 13 Nov 2010 20:06:16 GMT",
"version": "v3"
}
] | 2011-06-15 | [
[
"Poplawski",
"Nikodem J.",
""
]
] | The metric-affine Lagrangian of Ponomarev and Obukhov for the unified gravitational and electromagnetic field is linear in the Ricci scalar and quadratic in the tensor of homothetic curvature. We apply to this Lagrangian the variational principle with the tetrad and spin connection as dynamical variables and show that,... |
gr-qc/0009035 | Andri M. Gretarsson | Steven D. Penn, Gregory M. Harry, Andri M. Gretarsson, Scott E.
Kittelberger, Peter R. Saulson, John J. Schiller, Joshua R. Smith, and Sol O.
Swords | High quality factor measured in fused silica | Preprint - Under review by LSC publications committee | Rev.Sci.Instrum. 72 (2001) 3670-3673 | 10.1063/1.1394183 | null | gr-qc | null | We have measured the mechanical dissipation in a sample of fused silica drawn
into a rod. The sample was hung from a multiple-bob suspension, which isolated
it from rubbing against its support, from recoil in the support structure, and
from seismic noise. The quality factor, Q, was measured for several modes with
a h... | [
{
"created": "Mon, 11 Sep 2000 18:48:52 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Penn",
"Steven D.",
""
],
[
"Harry",
"Gregory M.",
""
],
[
"Gretarsson",
"Andri M.",
""
],
[
"Kittelberger",
"Scott E.",
""
],
[
"Saulson",
"Peter R.",
""
],
[
"Schiller",
"John J.",
""
],
[
"Smith",
"Joshua R... | We have measured the mechanical dissipation in a sample of fused silica drawn into a rod. The sample was hung from a multiple-bob suspension, which isolated it from rubbing against its support, from recoil in the support structure, and from seismic noise. The quality factor, Q, was measured for several modes with a hig... |
1807.10794 | Paola Rioseco | Paola Rioseco and Olivier Sarbach | Phase space mixing in the equatorial plane of a Kerr black hole | Improved version including new plots, the meaning of the main theorem
clarified and typos corrected Fig 5, 14 pages | Phys. Rev. D 98, 124024 (2018) | 10.1103/PhysRevD.98.124024 | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that a collisionless, relativistic kinetic gas configuration
propagating in the equatorial plane of a Kerr black hole undergoes a relaxation
process and eventually settles down to a stationary, axisymmetric configuration
surrounding the black hole. The underlying mechanism for this relaxation
process is d... | [
{
"created": "Fri, 27 Jul 2018 18:44:54 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Sep 2018 19:56:06 GMT",
"version": "v2"
}
] | 2018-12-26 | [
[
"Rioseco",
"Paola",
""
],
[
"Sarbach",
"Olivier",
""
]
] | It is shown that a collisionless, relativistic kinetic gas configuration propagating in the equatorial plane of a Kerr black hole undergoes a relaxation process and eventually settles down to a stationary, axisymmetric configuration surrounding the black hole. The underlying mechanism for this relaxation process is due... |
2207.14517 | Chao-Jun Feng | Chao-Jun Feng, Ao Guo, Zhong-Ming Xie, Miao Li | Photons generated by gravitional waves in the near-zone of a neutron
star | 17pages,2figures | null | 10.1016/j.nuclphysb.2022.116029 | null | gr-qc astro-ph.CO astro-ph.GA hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When a gravitational wave or a graviton travels through an electric or
magnetic background, it could convert into a photon with some probability. In
this paper, a dipole magnetic field is considered as this kind of background in
both the Minkowski spacetime and the curved spacetime in the near-zone of a
neutron star.... | [
{
"created": "Fri, 29 Jul 2022 07:25:20 GMT",
"version": "v1"
}
] | 2022-12-14 | [
[
"Feng",
"Chao-Jun",
""
],
[
"Guo",
"Ao",
""
],
[
"Xie",
"Zhong-Ming",
""
],
[
"Li",
"Miao",
""
]
] | When a gravitational wave or a graviton travels through an electric or magnetic background, it could convert into a photon with some probability. In this paper, a dipole magnetic field is considered as this kind of background in both the Minkowski spacetime and the curved spacetime in the near-zone of a neutron star. I... |
1005.0820 | Hyeyoun Chung | Hyeyoun Chung | Asymptotic Symmetries of Rindler Space at the Horizon and Null Infinity | 37 pages, 4 figures. Version 3: New Section 5 added | Phys.Rev.D82:044019,2010 | 10.1103/PhysRevD.82.044019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the asymptotic symmetries of Rindler space at null infinity
and at the event horizon using both systematic and ad hoc methods. We find that
the approaches that yield infinite-dimensional asymptotic symmetry algebras in
the case of anti-de Sitter and flat spaces only give a finite-dimensional
algebra fo... | [
{
"created": "Wed, 5 May 2010 19:26:40 GMT",
"version": "v1"
},
{
"created": "Mon, 10 May 2010 13:39:20 GMT",
"version": "v2"
},
{
"created": "Mon, 21 Jun 2010 10:29:14 GMT",
"version": "v3"
}
] | 2014-11-21 | [
[
"Chung",
"Hyeyoun",
""
]
] | We investigate the asymptotic symmetries of Rindler space at null infinity and at the event horizon using both systematic and ad hoc methods. We find that the approaches that yield infinite-dimensional asymptotic symmetry algebras in the case of anti-de Sitter and flat spaces only give a finite-dimensional algebra for ... |
0907.2181 | Bernard Linet | Bernard Linet | Bending of a light ray within a dispersive medium in a uniform
gravitational field | Latex, 4 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, Dressel et al determined the vertical deflection of a light ray in
a medium, with a strong frequency-dependent dispersion, at rest in a uniform
gravitational field. We take up this question within the general relativistic
theory of the propagation of light in a dispersive medium, due to Synge.
| [
{
"created": "Mon, 13 Jul 2009 14:48:52 GMT",
"version": "v1"
}
] | 2009-07-14 | [
[
"Linet",
"Bernard",
""
]
] | Recently, Dressel et al determined the vertical deflection of a light ray in a medium, with a strong frequency-dependent dispersion, at rest in a uniform gravitational field. We take up this question within the general relativistic theory of the propagation of light in a dispersive medium, due to Synge. |
2407.20144 | Davide Perrone | A. Ianniccari, A. J. Iovino, A. Kehagias, P. Pani, G. Perna, D.
Perrone, A. Riotto | Deciphering the Instability of the Black Hole Ringdown Quasinormal
Spectrum | 5 pages, 2 figures, supplementary material available | null | null | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | The spectrum of the quasinormal modes of the gravitational waves emitted
during the ringdown phase following the merger of two black holes is of primary
importance in gravitational astronomy. However, the spectrum is extremely
sensitive to small disturbances of the system, thus potentially jeopardizing
the prediction... | [
{
"created": "Mon, 29 Jul 2024 16:18:25 GMT",
"version": "v1"
}
] | 2024-07-30 | [
[
"Ianniccari",
"A.",
""
],
[
"Iovino",
"A. J.",
""
],
[
"Kehagias",
"A.",
""
],
[
"Pani",
"P.",
""
],
[
"Perna",
"G.",
""
],
[
"Perrone",
"D.",
""
],
[
"Riotto",
"A.",
""
]
] | The spectrum of the quasinormal modes of the gravitational waves emitted during the ringdown phase following the merger of two black holes is of primary importance in gravitational astronomy. However, the spectrum is extremely sensitive to small disturbances of the system, thus potentially jeopardizing the predictions ... |
2011.06641 | Adrien Bourgoin | A. Bourgoin (1 and 2), S. Bouquillon (2), A. Hees (2), C. Le
Poncin-Lafitte (2), Q. G. Bailey (3), J. J. Howard (3), M.-C. Angonin (2), G.
Francou (2), J. Chab\'e (4), C. Courde (4), and J.-M. Torre (4) ((1)
Dipartimento di Ingegneria Industriale, University of Bologna, Forl\`i,
Italy, (2) SYRTE, Observatoire d... | Constraining velocity-dependent Lorentz/CPT-violations using Lunar Laser
Ranging | 8 pages, 1 figure | Phys. Rev. D 103, 064055 (2021) | 10.1103/PhysRevD.103.064055 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The possibility for Lorentz/CPT-breaking, which is motivated by unification
theories, can be systematically tested within the standard-model extension
framework. In the pure gravity sector, the mass dimension 5 operators produce
new Lorentz and CPT-breaking terms in the 2-body equations of motion that
depend on the r... | [
{
"created": "Thu, 12 Nov 2020 20:33:15 GMT",
"version": "v1"
}
] | 2021-03-31 | [
[
"Bourgoin",
"A.",
"",
"1 and 2"
],
[
"Bouquillon",
"S.",
""
],
[
"Hees",
"A.",
""
],
[
"Poncin-Lafitte",
"C. Le",
""
],
[
"Bailey",
"Q. G.",
""
],
[
"Howard",
"J. J.",
""
],
[
"Angonin",
"M. -C.",
""
... | The possibility for Lorentz/CPT-breaking, which is motivated by unification theories, can be systematically tested within the standard-model extension framework. In the pure gravity sector, the mass dimension 5 operators produce new Lorentz and CPT-breaking terms in the 2-body equations of motion that depend on the rel... |
2311.18602 | Vladimir Denk | Vladimir Denk, David Vasak, Johannes Kirsch | Massive propagating modes of torsion | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dynamics of the torsion field is analyzed in the framework of the
Covariant Canonical Gauge Theory of Gravity (CCGG), a De~Donder-Weyl
Hamiltonian formulation of gauge gravity. The action is quadratic in both, the
torsion and the Riemann-Cartan tensor. Since the latter adds the derivative of
torsion to the equati... | [
{
"created": "Thu, 30 Nov 2023 14:55:29 GMT",
"version": "v1"
},
{
"created": "Tue, 28 May 2024 13:15:11 GMT",
"version": "v2"
}
] | 2024-05-29 | [
[
"Denk",
"Vladimir",
""
],
[
"Vasak",
"David",
""
],
[
"Kirsch",
"Johannes",
""
]
] | The dynamics of the torsion field is analyzed in the framework of the Covariant Canonical Gauge Theory of Gravity (CCGG), a De~Donder-Weyl Hamiltonian formulation of gauge gravity. The action is quadratic in both, the torsion and the Riemann-Cartan tensor. Since the latter adds the derivative of torsion to the equation... |
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