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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/9503029 | null | Edward Malec and Niall \'O Murchadha | Trapped surfaces in cosmological spacetimes | Revtex,12 pages, no diagrams | Phys.Rev. D54 (1996) 4799-4804 | 10.1103/PhysRevD.54.4799 | null | gr-qc | null | We investigate the formation of trapped surfaces in cosmological spacetimes,
using constant mean curvature slicing. Quantitative criteria for the formation
of trapped surfaces demonstrate that cosmological regions enclosed by trapped
surfaces may have matter density exceeding significantly the background matter
densi... | [
{
"created": "Thu, 16 Mar 1995 20:28:28 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Malec",
"Edward",
""
],
[
"Murchadha",
"Niall Ó",
""
]
] | We investigate the formation of trapped surfaces in cosmological spacetimes, using constant mean curvature slicing. Quantitative criteria for the formation of trapped surfaces demonstrate that cosmological regions enclosed by trapped surfaces may have matter density exceeding significantly the background matter density... |
2010.04131 | Rhys Green | Rhys Green, Charlie Hoy, Stephen Fairhurst, Mark Hannam, Francesco
Pannarale, and Cory Thomas | Identifying when Precession can be Measured in Gravitational Waveforms | 23 pages, 20 figures | Phys. Rev. D 103, 124023 (2021) | 10.1103/PhysRevD.103.124023 | LIGO-P2000376 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In binary-black-hole systems where the black-hole spins are misaligned with
the orbital angular momentum, precession effects leave characteristic
modulations in the emitted gravitational waveform. Here, we investigate where
in the parameter space we will be able to accurately identify precession, for
likely observati... | [
{
"created": "Thu, 8 Oct 2020 17:18:05 GMT",
"version": "v1"
},
{
"created": "Wed, 12 May 2021 08:00:55 GMT",
"version": "v2"
}
] | 2021-06-16 | [
[
"Green",
"Rhys",
""
],
[
"Hoy",
"Charlie",
""
],
[
"Fairhurst",
"Stephen",
""
],
[
"Hannam",
"Mark",
""
],
[
"Pannarale",
"Francesco",
""
],
[
"Thomas",
"Cory",
""
]
] | In binary-black-hole systems where the black-hole spins are misaligned with the orbital angular momentum, precession effects leave characteristic modulations in the emitted gravitational waveform. Here, we investigate where in the parameter space we will be able to accurately identify precession, for likely observation... |
1512.05460 | Miguel Sabido | J. F. Chagoya and M. Sabido | Anistropic Invariant FRW Cosmology | 6 pages, 5 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the effects of including anisotropic scaling
invariance in the minisuperspace Lagrangian for a universe modelled by the
Friedman-Robertson-Walker metric, a massless scalar field and cosmological
constant. We find that canonical quantization of this system leads to a
Schroedinger type equation, ... | [
{
"created": "Thu, 17 Dec 2015 04:25:28 GMT",
"version": "v1"
}
] | 2015-12-18 | [
[
"Chagoya",
"J. F.",
""
],
[
"Sabido",
"M.",
""
]
] | In this paper we study the effects of including anisotropic scaling invariance in the minisuperspace Lagrangian for a universe modelled by the Friedman-Robertson-Walker metric, a massless scalar field and cosmological constant. We find that canonical quantization of this system leads to a Schroedinger type equation, th... |
gr-qc/9708049 | Lin FengLi | Feng-Li Lin and Chopin Soo | Quantum field theory with and without conical singularities: Black holes
with cosmological constant and the multi-horizon scenario | LaTeX file, 15 pages | Class.Quant.Grav. 16 (1999) 551-562 | 10.1088/0264-9381/16/2/017 | null | gr-qc hep-th | null | Boundary conditions and the corresponding states of a quantum field theory
depend on how the horizons are taken into account. There is ambiguity as to
which method is appropriate because different ways of incorporating the
horizons lead to different results. We propose that a natural way of including
the horizons is ... | [
{
"created": "Thu, 21 Aug 1997 10:38:33 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Feb 1999 18:15:49 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Lin",
"Feng-Li",
""
],
[
"Soo",
"Chopin",
""
]
] | Boundary conditions and the corresponding states of a quantum field theory depend on how the horizons are taken into account. There is ambiguity as to which method is appropriate because different ways of incorporating the horizons lead to different results. We propose that a natural way of including the horizons is to... |
2005.14474 | Hans Christian \"Ottinger | Hans Christian \"Ottinger | Mathematical structure and physical content of composite gravity in
weak-field approximation | This paper elaborates the "Composite higher derivative theory of
gravity" proposed in Phys. Rev. Research 2, 013190 (2020) [which is an
expanded version of arXiv:1806.02765] for the weak field approximation in
greatest detail; 17 pages | Phys. Rev. D 102, 064024 (2020) | 10.1103/PhysRevD.102.064024 | null | gr-qc math-ph math.MP physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The natural constraints for the weak-field approximation to composite
gravity, which is obtained by expressing the gauge vector fields of the
Yang-Mills theory based on the Lorentz group in terms of tetrad variables and
their derivatives, are analyzed in detail within a canonical Hamiltonian
approach. Although this h... | [
{
"created": "Fri, 29 May 2020 09:45:02 GMT",
"version": "v1"
}
] | 2020-09-16 | [
[
"Öttinger",
"Hans Christian",
""
]
] | The natural constraints for the weak-field approximation to composite gravity, which is obtained by expressing the gauge vector fields of the Yang-Mills theory based on the Lorentz group in terms of tetrad variables and their derivatives, are analyzed in detail within a canonical Hamiltonian approach. Although this hig... |
1301.5250 | Rodrigo Maier | Rodrigo Maier, Nelson Pinto-Neto and Ivano Dami\~ao Soares | Bouncing Model in Brane World Theory | null | Phys. Rev. D 87, 043528 (2013) | 10.1103/PhysRevD.87.043528 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the nonlinear dynamics of a closed Friedmann-Robertson-Walker
universe in the framework of Brane World formalism with a timelike extra
dimension. In this scenario, the Friedmann equations contain additional terms
arising from the bulk-brane interaction which provide a concrete model for
nonsingular bounces... | [
{
"created": "Tue, 22 Jan 2013 17:30:41 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Maier",
"Rodrigo",
""
],
[
"Pinto-Neto",
"Nelson",
""
],
[
"Soares",
"Ivano Damião",
""
]
] | We examine the nonlinear dynamics of a closed Friedmann-Robertson-Walker universe in the framework of Brane World formalism with a timelike extra dimension. In this scenario, the Friedmann equations contain additional terms arising from the bulk-brane interaction which provide a concrete model for nonsingular bounces i... |
1910.12508 | Kazufumi Takahashi | Kazufumi Takahashi, Daisuke Yoshida | Ghost-free resummation of gravitational interactions of a 2-form gauge
field | 7 pages; matches published version | Phys. Rev. D 101, 024049 (2020) | 10.1103/PhysRevD.101.024049 | KOBE-COSMO-19-18 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find that the recently-proposed ghost-free interaction of a 2-form gauge
field in four dimensions, which contains derivative couplings in a
nonperturbative manner, can be regarded as a resummation of ghostly interaction
terms. We investigate the higher derivative structure of this model in a
minisuperspace descrip... | [
{
"created": "Mon, 28 Oct 2019 09:08:49 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Jan 2020 23:12:25 GMT",
"version": "v2"
}
] | 2020-01-30 | [
[
"Takahashi",
"Kazufumi",
""
],
[
"Yoshida",
"Daisuke",
""
]
] | We find that the recently-proposed ghost-free interaction of a 2-form gauge field in four dimensions, which contains derivative couplings in a nonperturbative manner, can be regarded as a resummation of ghostly interaction terms. We investigate the higher derivative structure of this model in a minisuperspace descripti... |
gr-qc/9906044 | Giovanni Landi | Giovanni Landi | Eigenvalues as Dynamical Variables | 14 pages, Latex. Based on a talk given at the Arbeitstagung `Das
Standardmodell der Elementarteilchenphysik unter mathematisch-geometrischem
Aspekt', Hesselberg, Germany, March 1999 | Lect.Notes Phys. 596 (2002) 299-312 | null | Trieste-DSM-QM450 | gr-qc math-ph math.MP | null | We review some work done with C. Rovelli on the use of the eigenvalues of the
Dirac operator on a curved spacetime as dynamical variables, the main
motivation coming from their invariance under the action of diffeomorphisms.
The eigenvalues constitute an infinite set of ``observables'' for general
relativity and can ... | [
{
"created": "Mon, 14 Jun 1999 12:30:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Landi",
"Giovanni",
""
]
] | We review some work done with C. Rovelli on the use of the eigenvalues of the Dirac operator on a curved spacetime as dynamical variables, the main motivation coming from their invariance under the action of diffeomorphisms. The eigenvalues constitute an infinite set of ``observables'' for general relativity and can be... |
0710.0472 | Charmousis | Christos Charmousis | Ernst equation and spheroidal coordinates with a cosmological constant
term | 9 pages, no figures, some additional results to gr-qc/0610091.
Prepared for 12th Conference on Recent Developments in Gravity (NEB XII),
Nafplio, Greece, 29 Jun - 2 Jul 2006 | J.Phys.Conf.Ser.68:012007,2007 | 10.1088/1742-6596/68/1/012007 | LPT-ORSAY/06-72 | gr-qc hep-th | null | We discuss solution generating techniques treating stationary and axially
symmetric metrics in the presence of a cosmological constant. Using the
recently found extended form of Ernst's complex equation, which takes into
account the cosmological constant term, we propose an extension of spheroidal
coordinates adapted... | [
{
"created": "Tue, 2 Oct 2007 09:27:08 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Charmousis",
"Christos",
""
]
] | We discuss solution generating techniques treating stationary and axially symmetric metrics in the presence of a cosmological constant. Using the recently found extended form of Ernst's complex equation, which takes into account the cosmological constant term, we propose an extension of spheroidal coordinates adapted t... |
1111.6389 | Giovanni Acquaviva | G. Acquaviva, R. Di Criscienzo, M. Tolotti, L. Vanzo and S. Zerbini | Unruh--DeWitt detectors in spherically symmetric dynamical space-times | 19 pages, to appear on IJTP. arXiv admin note: substantial text
overlap with arXiv:1101.5254 | null | 10.1007/s10773-011-1033-2 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present paper, Unruh--DeWitt detectors are used in order to
investigate the issue of temperature associated with a spherically symmetric
dynamical space-times. Firstly, we review the semi-classical tunneling method,
then we introduce the Unruh--DeWitt detector approach. We show that for the
generic static blac... | [
{
"created": "Mon, 28 Nov 2011 10:11:31 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Acquaviva",
"G.",
""
],
[
"Di Criscienzo",
"R.",
""
],
[
"Tolotti",
"M.",
""
],
[
"Vanzo",
"L.",
""
],
[
"Zerbini",
"S.",
""
]
] | In the present paper, Unruh--DeWitt detectors are used in order to investigate the issue of temperature associated with a spherically symmetric dynamical space-times. Firstly, we review the semi-classical tunneling method, then we introduce the Unruh--DeWitt detector approach. We show that for the generic static black ... |
1211.3676 | Luc Nguyen | YanYan Li, Luc Nguyen | A generalized mass involving higher order symmetric function of the
curvature tensor | update references and comments | Ann. Henri Poincar\'e 14 (2013), no. 7, 1733-1746 | 10.1007/s00023-013-0230-3 | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We define a generalized mass for asymptotically flat manifolds using some
higher order symmetric function of the curvature tensor. This mass is
non-negative when the manifold is locally conformally flat and the $\sigma_k$
curvature vanishes at infinity. In addition, with the above assumptions, if the
mass is zero, th... | [
{
"created": "Thu, 15 Nov 2012 17:51:16 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Nov 2012 23:03:17 GMT",
"version": "v2"
}
] | 2014-10-14 | [
[
"Li",
"YanYan",
""
],
[
"Nguyen",
"Luc",
""
]
] | We define a generalized mass for asymptotically flat manifolds using some higher order symmetric function of the curvature tensor. This mass is non-negative when the manifold is locally conformally flat and the $\sigma_k$ curvature vanishes at infinity. In addition, with the above assumptions, if the mass is zero, then... |
gr-qc/9406052 | Gerard Clement | Gerard Clement | Classical solutions of gravitating Chern-Simons electrodynamics | 7 pages (LaTex), GCR-94/07/01 | null | null | null | gr-qc hep-th | null | We discuss the reduction of gravitating Chern-Simons electrodynamics with two
commuting Killing vectors to a dynamical problem with four degrees of freedom,
and present regular particle-like solutions.
| [
{
"created": "Wed, 29 Jun 1994 08:53:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Clement",
"Gerard",
""
]
] | We discuss the reduction of gravitating Chern-Simons electrodynamics with two commuting Killing vectors to a dynamical problem with four degrees of freedom, and present regular particle-like solutions. |
2311.18409 | Jianwei Mei | Jianwei Mei | Separated wave equations for all metric components over the Kerr
background | 5 pages; v2: Abstract tempararily modified to reflect a fatal flaw in
the paper | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | This paper describes a method that seeks to find the fully separated wave
equations for all the metric components over the Kerr background directly.
Unfortunately, the solution found in the original version is purely gauge. The
main text has not been corrected, as a follow up updated is hoped for and the
correct solu... | [
{
"created": "Thu, 30 Nov 2023 09:59:10 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Dec 2023 15:23:09 GMT",
"version": "v2"
}
] | 2023-12-05 | [
[
"Mei",
"Jianwei",
""
]
] | This paper describes a method that seeks to find the fully separated wave equations for all the metric components over the Kerr background directly. Unfortunately, the solution found in the original version is purely gauge. The main text has not been corrected, as a follow up updated is hoped for and the correct soluti... |
2405.07361 | Shambel Sahlu Akalu | Shambel Sahlu, \'Alvaro de la Cruz-Dombriz, Amare Abebe | Structure growth in $f(Q)$ cosmology | 7 Figures, 6 Tables, 22 pages | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We take into account redshift-space distortion measurements to investigate
the growth of cosmological large-scale structures within the framework of
modified symmetric teleparallel $f(Q)$ gravity. After comparing the predictions
of the $f(Q)$-gravity expansion history with OHD and SNIa datasets and
constraining the p... | [
{
"created": "Sun, 12 May 2024 18:46:28 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Jun 2024 18:01:14 GMT",
"version": "v2"
}
] | 2024-07-02 | [
[
"Sahlu",
"Shambel",
""
],
[
"de la Cruz-Dombriz",
"Álvaro",
""
],
[
"Abebe",
"Amare",
""
]
] | We take into account redshift-space distortion measurements to investigate the growth of cosmological large-scale structures within the framework of modified symmetric teleparallel $f(Q)$ gravity. After comparing the predictions of the $f(Q)$-gravity expansion history with OHD and SNIa datasets and constraining the per... |
0910.3507 | Alexander Zhuk | Maxim Eingorn, Alexander Zhuk | Non-relativistic limit of multidimensional gravity: exact solutions and
applications | LaTex file, 18 pages, 4 figures | Class.Quant.Grav.27:055002,2010 | 10.1088/0264-9381/27/5/055002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is found the exact solution of the Poisson equation for the
multidimensional space with topology $M_{3+d}=\mathbb{R}^3\times T^d$. This
solution describes smooth transition from the newtonian behavior $1/r_3$ for
distances bigger than periods of tori (the extra dimension sizes) to
multidimensional behavior $1/r^{1... | [
{
"created": "Mon, 19 Oct 2009 10:19:15 GMT",
"version": "v1"
}
] | 2010-02-17 | [
[
"Eingorn",
"Maxim",
""
],
[
"Zhuk",
"Alexander",
""
]
] | It is found the exact solution of the Poisson equation for the multidimensional space with topology $M_{3+d}=\mathbb{R}^3\times T^d$. This solution describes smooth transition from the newtonian behavior $1/r_3$ for distances bigger than periods of tori (the extra dimension sizes) to multidimensional behavior $1/r^{1+d... |
1712.00822 | Marek Szydlowski | Marek Szydlowski and Aleksander Stachowski | Polynomial $f(R)$ Palatini cosmology -- dynamical system approach | RevTeX 4-1, 30 pages, 19 figures | Phys. Rev. D 97, 103524 (2018) | 10.1103/PhysRevD.97.103524 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate cosmological dynamics based on $f(R)$ gravity in the Palatini
formulation. In this study we use the dynamical system methods. We show that
the evolution of the Friedmann equation reduces to the form of the piece-wise
smooth dynamical system. This system is is reduced to a 2D dynamical system of
the New... | [
{
"created": "Sun, 3 Dec 2017 19:29:59 GMT",
"version": "v1"
}
] | 2018-05-30 | [
[
"Szydlowski",
"Marek",
""
],
[
"Stachowski",
"Aleksander",
""
]
] | We investigate cosmological dynamics based on $f(R)$ gravity in the Palatini formulation. In this study we use the dynamical system methods. We show that the evolution of the Friedmann equation reduces to the form of the piece-wise smooth dynamical system. This system is is reduced to a 2D dynamical system of the Newto... |
1207.5150 | Jose Ademir Sales Lima | M. Campos and J. A. S. Lima | Black Hole Formation with an Interacting Vacuum Energy Density | 9 pages, 8 figures | null | 10.1103/PhysRevD.86.043012 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the gravitational collapse of a spherically symmetric massive core
of a star in which the fluid component is interacting with a growing vacuum
energy density. The influence of the variable vacuum in the collapsing core is
quantified by a phenomenological \beta-parameter as predicted by dimensional
argument... | [
{
"created": "Sat, 21 Jul 2012 14:54:16 GMT",
"version": "v1"
}
] | 2015-06-05 | [
[
"Campos",
"M.",
""
],
[
"Lima",
"J. A. S.",
""
]
] | We discuss the gravitational collapse of a spherically symmetric massive core of a star in which the fluid component is interacting with a growing vacuum energy density. The influence of the variable vacuum in the collapsing core is quantified by a phenomenological \beta-parameter as predicted by dimensional arguments ... |
1009.3195 | Florian Conrady | Florian Conrady (Perimeter Inst. Theor. Phys.) | Space as a low-temperature regime of graphs | 22 pages, 12 figures; v3: published version; J.Stat.Phys. 2011 | J.Statist.Phys.142:898,2011 | 10.1007/s10955-011-0135-9 | PI-QG-196 | gr-qc cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I define a statistical model of graphs in which 2-dimensional spaces arise at
low temperature. The configurations are given by graphs with a fixed number of
edges and the Hamiltonian is a simple, local function of the graphs.
Simulations show that there is a transition between a low-temperature regime in
which the gr... | [
{
"created": "Thu, 16 Sep 2010 15:10:20 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Oct 2010 01:45:02 GMT",
"version": "v2"
},
{
"created": "Fri, 11 Feb 2011 15:26:36 GMT",
"version": "v3"
}
] | 2011-02-28 | [
[
"Conrady",
"Florian",
"",
"Perimeter Inst. Theor. Phys."
]
] | I define a statistical model of graphs in which 2-dimensional spaces arise at low temperature. The configurations are given by graphs with a fixed number of edges and the Hamiltonian is a simple, local function of the graphs. Simulations show that there is a transition between a low-temperature regime in which the grap... |
1409.1450 | Bianca Dittrich | Bianca Dittrich | The continuum limit of loop quantum gravity - a framework for solving
the theory | draft chapter for a volume edited by A. Ashtekar and J. Pullin, to be
published in the World Scientific series "100 Years of General Relativity",
v2: small changes and updated references | null | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The construction of a continuum limit for the dynamics of loop quantum
gravity is unavoidable to complete the theory. We explain that such a
construction is equivalent to obtaining the continuum physical Hilbert space,
which encodes the solutions of the theory. We present iterative coarse graining
methods to construc... | [
{
"created": "Thu, 4 Sep 2014 14:16:26 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Oct 2016 15:54:39 GMT",
"version": "v2"
}
] | 2016-10-25 | [
[
"Dittrich",
"Bianca",
""
]
] | The construction of a continuum limit for the dynamics of loop quantum gravity is unavoidable to complete the theory. We explain that such a construction is equivalent to obtaining the continuum physical Hilbert space, which encodes the solutions of the theory. We present iterative coarse graining methods to construct ... |
2202.02362 | Jose Jovel | Norman Cruz, Esteban Gonz\'alez, Jose Jovel | Study of a viscous $\Lambda$WDM model: Near equilibrium condition,
entropy production, and cosmological constraints | 16 pages, 6 figures | null | 10.3390/sym14091866 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Extensions to a $\Lambda$DM model have been explored to face current tensions
that occur within its framework, which encompasses broadening the nature of the
dark matter (DM) component to include warmness and a non-perfect fluid
description. In this paper, we investigated the late-time cosmological
evolution of an ex... | [
{
"created": "Fri, 4 Feb 2022 19:54:03 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Mar 2022 23:32:29 GMT",
"version": "v2"
},
{
"created": "Fri, 10 Jun 2022 20:52:13 GMT",
"version": "v3"
}
] | 2022-09-27 | [
[
"Cruz",
"Norman",
""
],
[
"González",
"Esteban",
""
],
[
"Jovel",
"Jose",
""
]
] | Extensions to a $\Lambda$DM model have been explored to face current tensions that occur within its framework, which encompasses broadening the nature of the dark matter (DM) component to include warmness and a non-perfect fluid description. In this paper, we investigated the late-time cosmological evolution of an exac... |
gr-qc/9604035 | Yuri N. Obukhov | E.J. Vlachynsky, R. Tresguerres, Yu.N. Obukhov, and F.W. Hehl | An axially symmetric solution of metric-affine gravity | 5 pages, RevTex | Class.Quant.Grav. 13 (1996) 3253-3260 | 10.1088/0264-9381/13/12/016 | null | gr-qc | null | We present an exact stationary {\it axially symmetric} vacuum solution of
metric-affine gravity (MAG) which generalises the recently reported spherically
symmetric solution. Besides the metric, it carries nonmetricity and torsion as
post-Riemannian geometrical structures. The parameters of the solution are
interprete... | [
{
"created": "Thu, 18 Apr 1996 10:46:32 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Vlachynsky",
"E. J.",
""
],
[
"Tresguerres",
"R.",
""
],
[
"Obukhov",
"Yu. N.",
""
],
[
"Hehl",
"F. W.",
""
]
] | We present an exact stationary {\it axially symmetric} vacuum solution of metric-affine gravity (MAG) which generalises the recently reported spherically symmetric solution. Besides the metric, it carries nonmetricity and torsion as post-Riemannian geometrical structures. The parameters of the solution are interpreted ... |
2102.01556 | Dr. Bikash Chandra Paul | A Chanda, S Dey and B C Paul | Morris-Thorne Wormholes in $f(R,T)$ modified theory of gravity | 23 pages, 15 figures | null | 10.1007/s10714-021-02847-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study static traversable wormholes obtained by Morris and Thorne in
general relativity (GR) in the framework of a modified theory of gravity. The
modified gravitational action $f(R,T)$ is a function of the Ricci scalar ($R$)
and of the trace of the energy momentum tensor ($T$). For a modified gravity
$f(R,T)=R+\al... | [
{
"created": "Mon, 1 Feb 2021 12:36:59 GMT",
"version": "v1"
}
] | 2021-08-25 | [
[
"Chanda",
"A",
""
],
[
"Dey",
"S",
""
],
[
"Paul",
"B C",
""
]
] | We study static traversable wormholes obtained by Morris and Thorne in general relativity (GR) in the framework of a modified theory of gravity. The modified gravitational action $f(R,T)$ is a function of the Ricci scalar ($R$) and of the trace of the energy momentum tensor ($T$). For a modified gravity $f(R,T)=R+\alph... |
gr-qc/9601020 | Dario Nunez | Dar\'io N\'u\~nez, Hernando Quevedo, and Daniel Sudarsky | Black holes have no short hair | Published in Physical Review Letters, 13 pages in Latex | Phys.Rev.Lett. 76 (1996) 571-574 | 10.1103/PhysRevLett.76.571 | null | gr-qc | null | We show that in all theories in which black hole hair has been discovered,
the region with non-trivial structure of the non-linear matter fields must
extend beyond 3/2 the horizon radius, independently of all other parameters
present in the theory. We argue that this is a universal lower bound that
applies in every t... | [
{
"created": "Fri, 12 Jan 1996 01:03:34 GMT",
"version": "v1"
}
] | 2016-08-15 | [
[
"Núñez",
"Darío",
""
],
[
"Quevedo",
"Hernando",
""
],
[
"Sudarsky",
"Daniel",
""
]
] | We show that in all theories in which black hole hair has been discovered, the region with non-trivial structure of the non-linear matter fields must extend beyond 3/2 the horizon radius, independently of all other parameters present in the theory. We argue that this is a universal lower bound that applies in every the... |
gr-qc/9712002 | Plamen Fiziev | P. P. Fiziev | On the Action Principle in Affine Flat Spaces with Torsion | 11 pages, latex, no figures | in the Proceedings of the 2-nd Bulgarian Workshop "New Trends in
Quantum Field Theory", Razlog, 1995, editors A. Ganchev, R.Kerner, I.Todorov,
Heron Press Science Series, Sofia, p. 248, 1996 | null | SU-FzF: 4/95 | gr-qc hep-th | null | To comply with the equivalence principle in Einstein-Cartan-like theories of
gravity we propose a modification of the action principle in affine flat spaces
with torsion.
| [
{
"created": "Sun, 30 Nov 1997 12:07:35 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Fiziev",
"P. P.",
""
]
] | To comply with the equivalence principle in Einstein-Cartan-like theories of gravity we propose a modification of the action principle in affine flat spaces with torsion. |
2005.07035 | Giovanni Modanese | G. Modanese | Quantum-only metrics in spherically symmetric gravity | 15 pages, 8 figures. Final journal version | Quantum Reports 2020, 2(2), 314-325 | 10.3390/quantum2020021 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Einstein action for the gravitational field has some properties which
make of it, after quantization, a rare prototype of systems with quantum
configurations that do not have a classical analogue. Assuming spherical
symmetry in order to reduce the effective dimensionality, we have performed a
Monte Carlo simulati... | [
{
"created": "Tue, 12 May 2020 19:54:35 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Jun 2020 08:35:21 GMT",
"version": "v2"
}
] | 2020-06-23 | [
[
"Modanese",
"G.",
""
]
] | The Einstein action for the gravitational field has some properties which make of it, after quantization, a rare prototype of systems with quantum configurations that do not have a classical analogue. Assuming spherical symmetry in order to reduce the effective dimensionality, we have performed a Monte Carlo simulation... |
gr-qc/9712048 | Natalia E. Firsova | N. E. Firsova (Sankt-Petersburg, Russian Academy of Sciences) | Correct statement of a scattering problem for quantum charged scalar
particles on the Reissner-Nordstr\"{o}m black holes | 12 pages, LaTeX with using the ijmpd1.sty file from the package of
World Scientific Publishing Co., to appear in Int. J. Mod. Phys. D7 (1998) | Int.J.Mod.Phys. D7 (1998) 509-520 | 10.1142/S0218271898000346 | null | gr-qc | null | We study a correct statement of the scattering problem arising for quantum
charged scalar particles on the Reissner-Nordstr\"{o}m black holes when taking
into account the own electric field of black hole. The elements of the
corresponding S-matrix are explored in the form convenient to physical
applications and for a... | [
{
"created": "Thu, 11 Dec 1997 07:56:52 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Firsova",
"N. E.",
"",
"Sankt-Petersburg, Russian Academy of Sciences"
]
] | We study a correct statement of the scattering problem arising for quantum charged scalar particles on the Reissner-Nordstr\"{o}m black holes when taking into account the own electric field of black hole. The elements of the corresponding S-matrix are explored in the form convenient to physical applications and for app... |
2009.01904 | J. Alberto Vazquez JAV | J. Alberto V\'azquez, David Tamayo, Anjan A. Sen and Israel Quiros | Bayesian model selection on Scalar $\epsilon$-Field Dark Energy | 10 pages | Phys. Rev. D 103, 043506 (2021) | 10.1103/PhysRevD.103.043506 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The main aim of this paper is to analyse minimally-coupled scalar-fields --
quintessence and phantom -- as the main candidates to explain the accelerated
expansion of the universe and compare its observables to current cosmological
observations; as a byproduct we present its python module. This work includes a
parame... | [
{
"created": "Thu, 3 Sep 2020 19:46:46 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Sep 2020 02:04:38 GMT",
"version": "v2"
},
{
"created": "Wed, 3 Feb 2021 16:44:10 GMT",
"version": "v3"
}
] | 2021-02-10 | [
[
"Vázquez",
"J. Alberto",
""
],
[
"Tamayo",
"David",
""
],
[
"Sen",
"Anjan A.",
""
],
[
"Quiros",
"Israel",
""
]
] | The main aim of this paper is to analyse minimally-coupled scalar-fields -- quintessence and phantom -- as the main candidates to explain the accelerated expansion of the universe and compare its observables to current cosmological observations; as a byproduct we present its python module. This work includes a paramete... |
1111.7147 | Yoichi Aso | Yoichi Aso, Kentaro Somiya, Osamu Miyakawa | Length sensing and control strategies for the LCGT interferometer | 13 pages 9 figures. A proceedings paper for Amaldi9 conference | null | 10.1088/0264-9381/29/12/124008 | null | gr-qc astro-ph.IM physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The optical readout scheme for the length degrees of freedom of the LCGT
interferometer is proposed. The control scheme is compatible both with the
broadband and detuned operations of the interferometer. Interferometer
simulations using a simulation software Optickle show that the sensing noise
couplings caused by th... | [
{
"created": "Wed, 30 Nov 2011 12:57:32 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Jan 2012 07:25:40 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Aso",
"Yoichi",
""
],
[
"Somiya",
"Kentaro",
""
],
[
"Miyakawa",
"Osamu",
""
]
] | The optical readout scheme for the length degrees of freedom of the LCGT interferometer is proposed. The control scheme is compatible both with the broadband and detuned operations of the interferometer. Interferometer simulations using a simulation software Optickle show that the sensing noise couplings caused by the ... |
gr-qc/0605059 | Giampiero Esposito Dr. | Giampiero Esposito | Quantum cosmology from three different perspectives | 8 pages, Latex file, invited brief review prepared for the COT5
Session of the MG11 Conference in Berlin | Conf.Proc.C0607233:1893-1897,2008 | 10.1142/9789812834300_0280 | DSF preprint 2006/12 | gr-qc | null | Our review is devoted to three promising research lines in quantum cosmology
and the physics of the early universe. The nonperturbative renormalization
programme is making encouraging progress that we here assess from the point of
view of cosmological applications: Lagrangian and Hamiltonian form of pure
gravity with... | [
{
"created": "Wed, 10 May 2006 12:37:35 GMT",
"version": "v1"
}
] | 2016-11-15 | [
[
"Esposito",
"Giampiero",
""
]
] | Our review is devoted to three promising research lines in quantum cosmology and the physics of the early universe. The nonperturbative renormalization programme is making encouraging progress that we here assess from the point of view of cosmological applications: Lagrangian and Hamiltonian form of pure gravity with v... |
1904.02822 | Abhay Ashtekar | Abhay Ashtekar and Sina Bahrami | Asymptotics with a positive cosmological constant: IV. The `no-incoming
radiation' condition | 56 pages, 5 figures; several clarifications and references added to
make the material more easily accessible especially to geometric analysts and
mathematical relativists interested in conceptual issues.Version to appear in
PRD | Phys. Rev. D 100, 024042 (2019) | 10.1103/PhysRevD.100.024042 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Consider compact objects --such as neutron star or black hole binaries-- in
\emph{full, non-linear} general relativity. In the case with zero cosmological
constant $\Lambda$, the gravitational radiation emitted by such systems is
described by the well established, 50+ year old framework due to Bondi, Sachs,
Penrose a... | [
{
"created": "Thu, 4 Apr 2019 23:15:50 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Jul 2019 02:34:31 GMT",
"version": "v2"
}
] | 2019-07-31 | [
[
"Ashtekar",
"Abhay",
""
],
[
"Bahrami",
"Sina",
""
]
] | Consider compact objects --such as neutron star or black hole binaries-- in \emph{full, non-linear} general relativity. In the case with zero cosmological constant $\Lambda$, the gravitational radiation emitted by such systems is described by the well established, 50+ year old framework due to Bondi, Sachs, Penrose and... |
1502.06651 | Massimo Tinto | Massimo Tinto and Nan Yu | Time-Delay Interferometry with optical frequency comb | 32 pages, 4 figures | Phys. Rev. D 92, 042002 (2015) | 10.1103/PhysRevD.92.042002 | null | gr-qc physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Heterodyne laser phase measurements in a space-based gravitational wave
interferometer are degraded by the phase fluctuations of the onboard clocks,
resulting in unacceptable sensitivity performance levels of the interferometric
data. In order to calibrate out the clock phase noises it has been previously
suggested t... | [
{
"created": "Mon, 23 Feb 2015 23:19:28 GMT",
"version": "v1"
}
] | 2015-08-19 | [
[
"Tinto",
"Massimo",
""
],
[
"Yu",
"Nan",
""
]
] | Heterodyne laser phase measurements in a space-based gravitational wave interferometer are degraded by the phase fluctuations of the onboard clocks, resulting in unacceptable sensitivity performance levels of the interferometric data. In order to calibrate out the clock phase noises it has been previously suggested tha... |
2106.04369 | Ambuj Kumar Mishra | Ambuj Kumar Mishra, Shweta, Umesh Kumar Sharma | Non-exotic wormholes in 4-D Einstein-Gauss-Bonnet gravity | 21 pages, 14 figures | null | 10.1007/s12043-022-02458-0 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In the present paper, we investigate wormholes in 4D-Einstein-Gauss-Bonnet
gravity without the requirement of exotic matters. We have taken the radial
dependent red-shift function $\phi=\ln \left( {\frac {r_{{0}}}{r}}+1 \right)$
and shape function $b(r)={\frac{r_{0}\ln(r+1)}{\ln({r_0}+1)}}$ as well as
anisotropic mat... | [
{
"created": "Sun, 6 Jun 2021 13:40:58 GMT",
"version": "v1"
}
] | 2022-11-23 | [
[
"Mishra",
"Ambuj Kumar",
""
],
[
"Shweta",
"",
""
],
[
"Sharma",
"Umesh Kumar",
""
]
] | In the present paper, we investigate wormholes in 4D-Einstein-Gauss-Bonnet gravity without the requirement of exotic matters. We have taken the radial dependent red-shift function $\phi=\ln \left( {\frac {r_{{0}}}{r}}+1 \right)$ and shape function $b(r)={\frac{r_{0}\ln(r+1)}{\ln({r_0}+1)}}$ as well as anisotropic matte... |
gr-qc/9502027 | null | Pedro F. Gonzalez-Diaz | Radiation Field on Superspace | 9 pages, standard latex, no figures | null | null | IMAFF-RC-02-95 | gr-qc | null | We study the dynamics of multiwormhole configurations within the framework of
the Euclidean Polyakov approach to string theory, incorporating a modification
to the Hamiltonian which leads to a Planckian probability measure for the
Coleman parameters $\alpha$ that allows $\frac{1}{2}\alpha^{2}$ to be
interpreted as th... | [
{
"created": "Fri, 10 Feb 1995 08:04:16 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Gonzalez-Diaz",
"Pedro F.",
""
]
] | We study the dynamics of multiwormhole configurations within the framework of the Euclidean Polyakov approach to string theory, incorporating a modification to the Hamiltonian which leads to a Planckian probability measure for the Coleman parameters $\alpha$ that allows $\frac{1}{2}\alpha^{2}$ to be interpreted as the ... |
gr-qc/0409004 | Christian Boehmer | Andres Balaguera-Antolinez, Christian G. Boehmer, Marek Nowakowski | On astrophysical bounds of the cosmological constant | 19 pages, LaTeX; revised version with new section 8, improved
introduction and summary; one reference added | Int.J.Mod.Phys. D14 (2005) 1507-1526 | 10.1142/S0218271805007383 | TUW-04-23 | gr-qc astro-ph | null | Astrophysical bounds on the cosmological constant are examined for
spherically symmetric bodies. Similar limits emerge from hydrostatical and
gravitational equilibrium and the validity of the Newtonian limit. It is argued
that the bound coming from the analysis of exact solutions is not a feature of
the relativistic ... | [
{
"created": "Wed, 1 Sep 2004 11:07:25 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Jan 2005 11:21:39 GMT",
"version": "v2"
},
{
"created": "Mon, 27 Aug 2007 11:41:13 GMT",
"version": "v3"
}
] | 2007-08-27 | [
[
"Balaguera-Antolinez",
"Andres",
""
],
[
"Boehmer",
"Christian G.",
""
],
[
"Nowakowski",
"Marek",
""
]
] | Astrophysical bounds on the cosmological constant are examined for spherically symmetric bodies. Similar limits emerge from hydrostatical and gravitational equilibrium and the validity of the Newtonian limit. It is argued that the bound coming from the analysis of exact solutions is not a feature of the relativistic th... |
0908.3889 | Manuel Tiglio | Frank Herrmann, John Silberholz, Matias Bellone, Gustavo Guerberoff,
Manuel Tiglio | Integrating Post-Newtonian Equations on Graphics Processing Units | Added one reference | Class.Quant.Grav.27:032001,2010 | 10.1088/0264-9381/27/3/032001 | null | gr-qc astro-ph.CO astro-ph.EP astro-ph.GA astro-ph.HE astro-ph.IM astro-ph.SR cs.DC cs.GR cs.PF | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on early results of a numerical and statistical study of binary
black hole inspirals. The two black holes are evolved using post-Newtonian
approximations starting with initially randomly distributed spin vectors. We
characterize certain aspects of the distribution shortly before merger. In
particular we not... | [
{
"created": "Wed, 26 Aug 2009 20:00:38 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Aug 2009 17:39:59 GMT",
"version": "v2"
}
] | 2016-09-08 | [
[
"Herrmann",
"Frank",
""
],
[
"Silberholz",
"John",
""
],
[
"Bellone",
"Matias",
""
],
[
"Guerberoff",
"Gustavo",
""
],
[
"Tiglio",
"Manuel",
""
]
] | We report on early results of a numerical and statistical study of binary black hole inspirals. The two black holes are evolved using post-Newtonian approximations starting with initially randomly distributed spin vectors. We characterize certain aspects of the distribution shortly before merger. In particular we note ... |
1205.5577 | Luca Levrino | Luca Levrino and Angelo Tartaglia | From the elasticity theory to cosmology and vice versa | 11 pages, 3 figures | Science China Physics, Mechanics and Astronomy - Volume 57, Issue
4 , pp 597-603, 2014 | 10.1007/s11433-013-5169-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The paper shows how a generalization of the elasticity theory to four
dimensions and to space-time allows for a consistent description of the
homogeneous and isotropic universe, including the accelerated expansion. The
analogy is manifested by the inclusion in the traditional Lagrangian of general
relativity of an ad... | [
{
"created": "Thu, 24 May 2012 21:17:25 GMT",
"version": "v1"
}
] | 2014-03-19 | [
[
"Levrino",
"Luca",
""
],
[
"Tartaglia",
"Angelo",
""
]
] | The paper shows how a generalization of the elasticity theory to four dimensions and to space-time allows for a consistent description of the homogeneous and isotropic universe, including the accelerated expansion. The analogy is manifested by the inclusion in the traditional Lagrangian of general relativity of an addi... |
gr-qc/0601058 | Sean A. Hayward | Sean A. Hayward | Angular momentum and conservation laws for dynamical black holes | 4 latex pages, 3 eps figures. Presented at the 15th Workshop on
General Relativity and Gravitation, Tokyo Institute of Technology | null | null | null | gr-qc | null | Black holes can be practically located (e.g. in numerical simulations) by
trapping horizons, hypersurfaces foliated by marginal surfaces, and one desires
physically sound measures of their mass and angular momentum. A generically
unique angular momentum can be obtained from the Komar integral by demanding
that it sat... | [
{
"created": "Sun, 15 Jan 2006 22:26:38 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hayward",
"Sean A.",
""
]
] | Black holes can be practically located (e.g. in numerical simulations) by trapping horizons, hypersurfaces foliated by marginal surfaces, and one desires physically sound measures of their mass and angular momentum. A generically unique angular momentum can be obtained from the Komar integral by demanding that it satis... |
1409.0187 | Lawrence M. Krauss | Borun D. Chowdhury (1) and Lawrence M. Krauss (1,2) ((1) Arizona State
University, (2) Australian National University) | Hawking Evaporation is Inconsistent with a Classical Event Horizon at
$r=2M$ | 4 pages, 2 figs, submitted to Phys. Rev. Lett; revised in response to
referees reports | null | null | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A simple classical consideration of black hole formation and evaporation
times focusing solely on the frame of an observer at infinity demonstrates that
an infall cutoff outside the event horizon of a black hole must be imposed in
order for the formation time of a black hole event horizon to not exceed its
evaporatio... | [
{
"created": "Sun, 31 Aug 2014 06:20:14 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Apr 2015 04:24:08 GMT",
"version": "v2"
}
] | 2015-04-13 | [
[
"Chowdhury",
"Borun D.",
""
],
[
"Krauss",
"Lawrence M.",
""
]
] | A simple classical consideration of black hole formation and evaporation times focusing solely on the frame of an observer at infinity demonstrates that an infall cutoff outside the event horizon of a black hole must be imposed in order for the formation time of a black hole event horizon to not exceed its evaporation ... |
2102.00957 | Tao Wang | Qiang Li, Yanni Zhu, Towe Wang | Gravitational effect of a plasma on the shadow of Schwarzschild black
holes | 13 pages, 4 figures, Section V added | null | 10.1140/epjc/s10052-021-09959-z | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Considering a Schwarzschild black hole surrounded by a fully ionized hydrogen
plasma, we study the refractive effect and the pure gravitational effect of the
plasma on the shadow. The effects are treated in a unified formalism but
characterized by two independent parameters. For semi-realistic values of
parameters, w... | [
{
"created": "Mon, 1 Feb 2021 16:39:49 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Feb 2021 09:29:20 GMT",
"version": "v2"
},
{
"created": "Mon, 4 Oct 2021 08:05:04 GMT",
"version": "v3"
}
] | 2022-01-19 | [
[
"Li",
"Qiang",
""
],
[
"Zhu",
"Yanni",
""
],
[
"Wang",
"Towe",
""
]
] | Considering a Schwarzschild black hole surrounded by a fully ionized hydrogen plasma, we study the refractive effect and the pure gravitational effect of the plasma on the shadow. The effects are treated in a unified formalism but characterized by two independent parameters. For semi-realistic values of parameters, we ... |
gr-qc/0001100 | Giovanni Amelino-Camelia | Giovanni Amelino-Camelia | A testable description of space-time foam as a fundamental stochastic
gravity-wave background | 9 pages, LaTex/epsfig, 1 figure | null | null | CERN-TH/99-314 | gr-qc | null | I develop a phenomenological approach to the description of the noise levels
that the space-time foam of quantum gravity could induce in modern gravity-wave
detectors. Various possibilities are considered, including white noise and
random-walk noise. In particular, I find that the sensitivity level expected
for the p... | [
{
"created": "Sat, 29 Jan 2000 02:29:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Amelino-Camelia",
"Giovanni",
""
]
] | I develop a phenomenological approach to the description of the noise levels that the space-time foam of quantum gravity could induce in modern gravity-wave detectors. Various possibilities are considered, including white noise and random-walk noise. In particular, I find that the sensitivity level expected for the pla... |
2111.00494 | Soma Heydari | Soma Heydari and Kayoomars Karami | Primordial black holes ensued from exponential potential and coupling
parameter in nonminimal derivative inflation model | 29 pages, 5 figures | JCAP03(2022)033 | 10.1088/1475-7516/2022/03/033 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Here, Primordial Black Holes (PBHs) creation from exponential potential has
been inquired, through gravitationally raised friction emanated from the
nonminimal coupling between gravity and field derivative setup. Setting a
two-parted exponential function of inflaton field as coupling parameter, and
fine-tuning of fou... | [
{
"created": "Sun, 31 Oct 2021 13:21:24 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Mar 2022 07:56:13 GMT",
"version": "v2"
}
] | 2022-03-17 | [
[
"Heydari",
"Soma",
""
],
[
"Karami",
"Kayoomars",
""
]
] | Here, Primordial Black Holes (PBHs) creation from exponential potential has been inquired, through gravitationally raised friction emanated from the nonminimal coupling between gravity and field derivative setup. Setting a two-parted exponential function of inflaton field as coupling parameter, and fine-tuning of four ... |
1304.0259 | Mir Faizal | Mir Faizal | Fourth Quantization | 10 pages, 0 figures, accepted for publication in Phys. Lett. B | Phys. Lett. B727: 536, 2013 | 10.1016/j.physletb.2013.10.069 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we will analyse the creation of the multiverse. We will first
calculate the wave function for the multiverse using third quantization. Then
we will fourth quantize this theory. We will show that there is no single
vacuum state for this theory. Thus, we can end up with a multiverse, even after
starting f... | [
{
"created": "Sun, 31 Mar 2013 21:57:50 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Apr 2013 03:08:36 GMT",
"version": "v2"
},
{
"created": "Wed, 27 Nov 2013 09:50:22 GMT",
"version": "v3"
}
] | 2015-06-15 | [
[
"Faizal",
"Mir",
""
]
] | In this paper we will analyse the creation of the multiverse. We will first calculate the wave function for the multiverse using third quantization. Then we will fourth quantize this theory. We will show that there is no single vacuum state for this theory. Thus, we can end up with a multiverse, even after starting fro... |
2308.05904 | Gianluca Calcagni | Gianluca Calcagni, Sachiko Kuroyanagi | Log-periodic gravitational-wave background beyond Einstein gravity | 28 pages, 3 figures, 1 table. v2: section 3 reorganized and
shortened, conclusions expanded, references added; v3: typos corrected | Class. Quantum Grav. 41, 015031 (2023) | 10.1088/1361-6382/ad1123 | ET-0274A-23, IFT-UAM/CSIC-23-105 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Periodic patterns of logarithmic oscillations can arise in primordial
curvature perturbation spectra and in the associated gravitational-wave
background via different mechanisms. We show that, in the presence of log
oscillations, the spectral shape of the stochastic background has a unique
parametrization independent... | [
{
"created": "Fri, 11 Aug 2023 02:01:13 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Aug 2023 10:12:06 GMT",
"version": "v2"
},
{
"created": "Mon, 18 Dec 2023 09:55:30 GMT",
"version": "v3"
}
] | 2023-12-19 | [
[
"Calcagni",
"Gianluca",
""
],
[
"Kuroyanagi",
"Sachiko",
""
]
] | Periodic patterns of logarithmic oscillations can arise in primordial curvature perturbation spectra and in the associated gravitational-wave background via different mechanisms. We show that, in the presence of log oscillations, the spectral shape of the stochastic background has a unique parametrization independent o... |
gr-qc/9709053 | Bozhidar Z. Iliev | Bozhidar Z. Iliev (Institute for Nuclear Research and Nuclear Energy,
Bulgarian Academy of Sciences, Sofia, Bulgaria) | Normal frames and the validity of the equivalence principle | 14 pages, LaTeX 2e, the package amsfonts is needed | J.Phys.A30:4327-4336,1997 | 10.1088/0305-4470/30/12/019 | Communication JINR, E5-92-508, Dubna, 1992 | gr-qc dg-ga math.DG | null | We investigate the validity of the equivalence principle along paths in
gravitational theories based on derivations of the tensor algebra over a
differentiable manifold. We prove the existence of local bases, called normal,
in which the components of the derivations vanish along arbitrary paths. All
such bases are ex... | [
{
"created": "Sat, 20 Sep 1997 14:19:44 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Iliev",
"Bozhidar Z.",
"",
"Institute for Nuclear Research and Nuclear Energy,\n Bulgarian Academy of Sciences, Sofia, Bulgaria"
]
] | We investigate the validity of the equivalence principle along paths in gravitational theories based on derivations of the tensor algebra over a differentiable manifold. We prove the existence of local bases, called normal, in which the components of the derivations vanish along arbitrary paths. All such bases are expl... |
1510.06814 | Miguel Angel Garcia Aspeitia | Miguel A. Garcia-Aspeitia | Branes constrictions with White Dwarfs | 7 pages, 3 figures. Accepted for publication in EPJ C | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider here a robust study of stellar dynamics for White Dwarf Stars
with polytropic matter in the weak field approximation using the Lane-Emden
equation from the brane-world scenario. We also derive an analytical solution
to the nonlocal energy density and show the behavior and sensitivity of these
stars to the... | [
{
"created": "Fri, 23 Oct 2015 02:56:26 GMT",
"version": "v1"
}
] | 2015-10-26 | [
[
"Garcia-Aspeitia",
"Miguel A.",
""
]
] | We consider here a robust study of stellar dynamics for White Dwarf Stars with polytropic matter in the weak field approximation using the Lane-Emden equation from the brane-world scenario. We also derive an analytical solution to the nonlocal energy density and show the behavior and sensitivity of these stars to the p... |
0901.1023 | Xin Li | Zhe Chang and Xin Li | Modified Friedmann model in Randers-Finsler space of approximate Berwald
type as a possible alternative to dark energy hypothesis | null | Phys.Lett.B676:173-176,2009 | 10.1016/j.physletb.2009.05.001 | null | gr-qc | http://creativecommons.org/licenses/by/3.0/ | Gravitational field equations in Randers-Finsler space of approximate Berwald
type are investigated. A modified Friedmann model is proposed. It is showed
that the accelerated expanding universe is guaranteed by a constrained
Randers-Finsler structure without invoking dark energy. The geodesic in
Randers-Finsler space... | [
{
"created": "Thu, 8 Jan 2009 11:39:40 GMT",
"version": "v1"
}
] | 2009-05-29 | [
[
"Chang",
"Zhe",
""
],
[
"Li",
"Xin",
""
]
] | Gravitational field equations in Randers-Finsler space of approximate Berwald type are investigated. A modified Friedmann model is proposed. It is showed that the accelerated expanding universe is guaranteed by a constrained Randers-Finsler structure without invoking dark energy. The geodesic in Randers-Finsler space i... |
gr-qc/0310126 | Kirill Bronnikov | K.A. Bronnikov and B.E. Meierovich | Self-gravitating global monopole and nonsingular cosmology | 5 pages, uses snmp2003 style. Submitted to the Proceedings of
Symmetry 2003 Conference (Kiev, June 2003) | Econf C0306234:649-653,2003 | null | null | gr-qc | null | We review some recent results concerning the properties of a spherically
symmetric global monopole in $(D=d+2)$-dimensional general relativity. Some
common features of monopole solutions are found independently of the choice of
the symmetry-breaking potential. Thus, the solutions show six types of
qualitative behavio... | [
{
"created": "Thu, 30 Oct 2003 03:03:50 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Bronnikov",
"K. A.",
""
],
[
"Meierovich",
"B. E.",
""
]
] | We review some recent results concerning the properties of a spherically symmetric global monopole in $(D=d+2)$-dimensional general relativity. Some common features of monopole solutions are found independently of the choice of the symmetry-breaking potential. Thus, the solutions show six types of qualitative behavior ... |
2402.19373 | Theodoros Papanikolaou | Theodoros Papanikolaou, Charalampos Tzerefos, Spyros Basilakos,
Emmanuel N. Saridakis, Nick E. Mavromatos | Revisiting string-inspired running-vacuum models under the lens of light
primordial black holes | Accepted in Physical Review D | null | null | KCL-PH-TH/2024-11 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Light primordial black holes (PBHs) with masses
$M_\mathrm{PBH}<10^9\mathrm{g}$ can interestingly dominate the Universe's
energy budget and give rise to early matter-dominated (eMD) eras before Big
Bang Nucleosyntesis (BBN). During this eMD era, one is met with an abundant
production of induced gravitational waves (G... | [
{
"created": "Thu, 29 Feb 2024 17:20:39 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Jul 2024 14:50:23 GMT",
"version": "v2"
}
] | 2024-07-12 | [
[
"Papanikolaou",
"Theodoros",
""
],
[
"Tzerefos",
"Charalampos",
""
],
[
"Basilakos",
"Spyros",
""
],
[
"Saridakis",
"Emmanuel N.",
""
],
[
"Mavromatos",
"Nick E.",
""
]
] | Light primordial black holes (PBHs) with masses $M_\mathrm{PBH}<10^9\mathrm{g}$ can interestingly dominate the Universe's energy budget and give rise to early matter-dominated (eMD) eras before Big Bang Nucleosyntesis (BBN). During this eMD era, one is met with an abundant production of induced gravitational waves (GWs... |
0812.3132 | Geoffrey Lovelace | Geoffrey Lovelace | Reducing spurious gravitational radiation in binary-black-hole
simulations by using conformally curved initial data | Submitted to Class. Quantum Grav. for inclusion in the "Numerical
Relativity & Data Analysis 2008 proceedings" special issue | Class.Quant.Grav.26:114002,2009 | 10.1088/0264-9381/26/11/114002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | At early times in numerical evolutions of binary black holes, current
simulations contain an initial burst of spurious gravitational radiation (also
called "junk radiation") which is not astrophysically realistic. The spurious
radiation is a consequence of how the binary-black-hole initial data are
constructed: the i... | [
{
"created": "Tue, 16 Dec 2008 19:27:58 GMT",
"version": "v1"
}
] | 2009-06-10 | [
[
"Lovelace",
"Geoffrey",
""
]
] | At early times in numerical evolutions of binary black holes, current simulations contain an initial burst of spurious gravitational radiation (also called "junk radiation") which is not astrophysically realistic. The spurious radiation is a consequence of how the binary-black-hole initial data are constructed: the ini... |
0708.3493 | Archana Pai | Archana Pai (AEI, Potsdam), Eric Chassande-Mottin (APC, Paris; OCA,
Nice) and Olivier Rabaste (APC, Paris) | Best network chirplet-chain: Near-optimal coherent detection of
unmodeled gravitation wave chirps with a network of detectors | 22 pages, revtex4, 6 figures | Phys.Rev.D77:062005,2008 | 10.1103/PhysRevD.77.062005 | AEI-2007-119 | gr-qc | null | The searches of impulsive gravitational waves (GW) in the data of the
ground-based interferometers focus essentially on two types of waveforms: short
unmodeled bursts and chirps from inspiralling compact binaries. There is room
for other types of searches based on different models. Our objective is to fill
this gap. ... | [
{
"created": "Sun, 26 Aug 2007 16:53:39 GMT",
"version": "v1"
}
] | 2008-12-18 | [
[
"Pai",
"Archana",
"",
"AEI, Potsdam"
],
[
"Chassande-Mottin",
"Eric",
"",
"APC, Paris; OCA,\n Nice"
],
[
"Rabaste",
"Olivier",
"",
"APC, Paris"
]
] | The searches of impulsive gravitational waves (GW) in the data of the ground-based interferometers focus essentially on two types of waveforms: short unmodeled bursts and chirps from inspiralling compact binaries. There is room for other types of searches based on different models. Our objective is to fill this gap. Mo... |
gr-qc/9701035 | John Baker | John Baker, Chun Biu Li | The two-phase approximation for black hole collisions: Is it robust? | 4 pages, 3 figures, submitted to Classical and Quantum Gravity | Class.Quant.Grav.14:L77-L82,1997 | 10.1088/0264-9381/14/5/001 | CGPG-97/1-1 | gr-qc | null | Recently Abrahams and Cook devised a method of estimating the total radiated
energy resulting from collisions of distant black holes by applying Newtonian
evolution to the holes up to the point where a common apparent horizon forms
around the two black holes and subsequently applying Schwarzschild perturbation
techni... | [
{
"created": "Wed, 15 Jan 1997 20:02:35 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Baker",
"John",
""
],
[
"Li",
"Chun Biu",
""
]
] | Recently Abrahams and Cook devised a method of estimating the total radiated energy resulting from collisions of distant black holes by applying Newtonian evolution to the holes up to the point where a common apparent horizon forms around the two black holes and subsequently applying Schwarzschild perturbation techniqu... |
1901.06747 | C. Q. Geng | Yow-Chun Chen, Chao-Qiang Geng, Chung-Chi Lee and Hongwei Yu | Matter Power Spectra in Viable $f(R)$ Gravity Models with Dynamical
Background | 16 pages, 4 figures, to be published at EPJC | Eur. Phys. J. C79 (2019) 93 | 10.1140/epjc/s10052-019-6613-y | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the matter power spectra in the viable $f(R)$ gravity models with
the dynamical background evolution and linear perturbation theory by using the
CosmoMC package. We show that these viable $f(R)$ models generally shorten the
age of the universe and suppress the matter density fluctuation. We examine the
allow... | [
{
"created": "Sun, 20 Jan 2019 23:20:45 GMT",
"version": "v1"
}
] | 2019-02-01 | [
[
"Chen",
"Yow-Chun",
""
],
[
"Geng",
"Chao-Qiang",
""
],
[
"Lee",
"Chung-Chi",
""
],
[
"Yu",
"Hongwei",
""
]
] | We study the matter power spectra in the viable $f(R)$ gravity models with the dynamical background evolution and linear perturbation theory by using the CosmoMC package. We show that these viable $f(R)$ models generally shorten the age of the universe and suppress the matter density fluctuation. We examine the allowed... |
0907.5160 | Guillermo A. Mena Marugan | Guillermo A. Mena Marugan | A Brief Introduction to Loop Quantum Cosmology | 15 pages, published in AIP Conference Proceedings, Volume 1130,
Geometry and Physics: XVII International Fall Workshop on Geometry and
Physics | AIP Conf.Proc.1130:89-100,2009 | 10.1063/1.3146242 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In recent years, Loop Quantum Gravity has emerged as a solid candidate for a
nonperturbative quantum theory of General Relativity. It is a background
independent theory based on a description of the gravitational field in terms
of holonomies and fluxes. In order to discuss its physical implications, a lot
of attentio... | [
{
"created": "Wed, 29 Jul 2009 15:34:29 GMT",
"version": "v1"
}
] | 2009-10-16 | [
[
"Marugan",
"Guillermo A. Mena",
""
]
] | In recent years, Loop Quantum Gravity has emerged as a solid candidate for a nonperturbative quantum theory of General Relativity. It is a background independent theory based on a description of the gravitational field in terms of holonomies and fluxes. In order to discuss its physical implications, a lot of attention ... |
0712.1741 | Jose Luis Jaramillo | J.L. Jaramillo, N. Vasset and M. Ansorg | A numerical study of Penrose-like inequalities in a family of axially
symmetric initial data | Contribution to the "Encuentros Relativistas Espanoles - Spanish
Relativity Meeting ERE07" Proceedings, Tenerife, Spain (September 2007) | null | 10.1051/eas:0830039 | null | gr-qc | null | Our current picture of black hole gravitational collapse relies on two
assumptions: i) the resulting singularity is hidden behind an event horizon --
weak cosmic censorship conjecture -- and ii) spacetime eventually settles down
to a stationarity state. In this setting, it follows that the minimal area
containing an ... | [
{
"created": "Tue, 11 Dec 2007 15:43:43 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Jaramillo",
"J. L.",
""
],
[
"Vasset",
"N.",
""
],
[
"Ansorg",
"M.",
""
]
] | Our current picture of black hole gravitational collapse relies on two assumptions: i) the resulting singularity is hidden behind an event horizon -- weak cosmic censorship conjecture -- and ii) spacetime eventually settles down to a stationarity state. In this setting, it follows that the minimal area containing an ap... |
gr-qc/0512108 | Jonathan Thornburg | Peter Diener, Frank Herrmann, Denis Pollney, Erik Schnetter, Edward
Seidel, Ryoji Takahashi, Jonathan Thornburg, Jason Ventrella | Accurate Evolution of Orbiting Binary Black Holes | 4 pages, 3 figures | Phys.Rev.Lett. 96 (2006) 121101 | 10.1103/PhysRevLett.96.121101 | AEI-2005-197, LSU-REL-121605 | gr-qc | null | We present a detailed analysis of binary black hole evolutions in the last
orbit, and demonstrate consistent and convergent results for the trajectories
of the individual bodies. The gauge choice can significantly affect the overall
accuracy of the evolution. It is possible to reconcile certain gauge dependent
discre... | [
{
"created": "Mon, 19 Dec 2005 20:42:56 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Diener",
"Peter",
""
],
[
"Herrmann",
"Frank",
""
],
[
"Pollney",
"Denis",
""
],
[
"Schnetter",
"Erik",
""
],
[
"Seidel",
"Edward",
""
],
[
"Takahashi",
"Ryoji",
""
],
[
"Thornburg",
"Jonathan",
""
],
... | We present a detailed analysis of binary black hole evolutions in the last orbit, and demonstrate consistent and convergent results for the trajectories of the individual bodies. The gauge choice can significantly affect the overall accuracy of the evolution. It is possible to reconcile certain gauge dependent discrepa... |
gr-qc/0209100 | Chiang-Mei Chen | Chiang-Mei Chen, James M. Nester, and Roh-Suan Tung | Spinor Formulations for Gravitational Energy-Momentum | references added, final version to appear in the Proceeding of the
6th Conference on Clifford Algebras and their Applications in Mathematical
Physics (Cookeville, Tennessee, 20-25 May, 2002) | null | null | null | gr-qc | null | We first describe a class of spinor-curvature identities (SCI) which have
gravitational applications. Then we sketch the topic of gravitational
energy-momentum, its connection with Hamiltonian boundary terms and the issues
of positivity and (quasi)localization. Using certain SCIs several spinor
expressions for the Ha... | [
{
"created": "Thu, 26 Sep 2002 11:15:11 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Dec 2002 10:37:13 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Chen",
"Chiang-Mei",
""
],
[
"Nester",
"James M.",
""
],
[
"Tung",
"Roh-Suan",
""
]
] | We first describe a class of spinor-curvature identities (SCI) which have gravitational applications. Then we sketch the topic of gravitational energy-momentum, its connection with Hamiltonian boundary terms and the issues of positivity and (quasi)localization. Using certain SCIs several spinor expressions for the Hami... |
1612.03665 | Maximiliano Ujevic | Tim Dietrich, Maximiliano Ujevic | Modeling dynamical ejecta from binary neutron star mergers and
implications for electromagnetic counterparts | 25 pages, 11 figures | null | 10.1088/1361-6382/aa6bb0 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In addition to the emission of gravitational waves (GWs) the coalescence and
merger of two neutron stars will produce a variety of electromagnetic (EM)
signals. In this work we combine a large set of numerical relativity
simulations performed by different groups and we present fits for the mass,
kinetic energy, and t... | [
{
"created": "Mon, 12 Dec 2016 13:24:28 GMT",
"version": "v1"
}
] | 2017-05-03 | [
[
"Dietrich",
"Tim",
""
],
[
"Ujevic",
"Maximiliano",
""
]
] | In addition to the emission of gravitational waves (GWs) the coalescence and merger of two neutron stars will produce a variety of electromagnetic (EM) signals. In this work we combine a large set of numerical relativity simulations performed by different groups and we present fits for the mass, kinetic energy, and the... |
gr-qc/9809025 | Andrew DeBenedictis | Andrew DeBenedictis | Thermodynamics and Evaporation of Closed Black Cosmic Strings | 10 pages with AMS packages. 1 figure | null | null | null | gr-qc | null | Both the canonical and microcanonical ensembles are utilized to study the
thermodynamic and evaporation properties of a closed black cosmic string whose
spacetime is asymptotically anti deSitter. There are similarities and
differences to the Schwarzschild-anti deSitter and 2+1 BTZ black hole
solutions. It is found th... | [
{
"created": "Fri, 4 Sep 1998 19:40:44 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"DeBenedictis",
"Andrew",
""
]
] | Both the canonical and microcanonical ensembles are utilized to study the thermodynamic and evaporation properties of a closed black cosmic string whose spacetime is asymptotically anti deSitter. There are similarities and differences to the Schwarzschild-anti deSitter and 2+1 BTZ black hole solutions. It is found that... |
1708.01825 | Florent Michel | Florent Michel | Nonlinear and quantum effects in analogue gravity | Ph. D. thesis, in English with a 15-pages summary in French | null | null | null | gr-qc cond-mat.quant-gas physics.flu-dyn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present thesis deals with some properties of classical and quantum scalar
fields in an inhomogeneous and/or time-dependent background, focusing on models
where the latter can be described as a curved space-time with an event horizon.
While naturally formulated in a gravitational context, such models extend to
man... | [
{
"created": "Sat, 5 Aug 2017 23:03:08 GMT",
"version": "v1"
}
] | 2017-08-08 | [
[
"Michel",
"Florent",
""
]
] | The present thesis deals with some properties of classical and quantum scalar fields in an inhomogeneous and/or time-dependent background, focusing on models where the latter can be described as a curved space-time with an event horizon. While naturally formulated in a gravitational context, such models extend to many ... |
1601.04773 | Kazuharu Bamba | Kazuharu Bamba | Inflationary universe in fluid description | 10 pages, no figure, contribution to the 14th Regional Conference on
Mathematical Physics, November 9-14, 2015, Quaid-i-Azam University,
Islamabad, Pakistan, references added | null | null | FU-PCG-09 | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a fluid description of inflationary cosmology. It is shown
that the three observables of the inflationary universe: the spectral index of
the curvature perturbations, the tensor-to-scalar ratio of the density
perturbations, and the running of the spectral index, can be compatible with
the Planck analys... | [
{
"created": "Tue, 19 Jan 2016 02:31:53 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Mar 2016 02:53:04 GMT",
"version": "v2"
}
] | 2016-03-02 | [
[
"Bamba",
"Kazuharu",
""
]
] | We investigate a fluid description of inflationary cosmology. It is shown that the three observables of the inflationary universe: the spectral index of the curvature perturbations, the tensor-to-scalar ratio of the density perturbations, and the running of the spectral index, can be compatible with the Planck analysis... |
1301.0361 | Cosimo Bambi | Cosimo Bambi | Testing the space-time geometry around black hole candidates with the
available radio and X-ray data | Invited review paper; 37 pages, 10 figures. v2: added a few
references | Astron.Rev.8:4-39,2013 | 10.1080/21672857.2013.11519712 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Astrophysical black hole candidates are thought to be the Kerr black holes
predicted by General Relativity, but the actual nature of these objects has
still to be proven. The Kerr black hole hypothesis can be tested by observing
strong gravity features and check if they are in agreement with the predictions
of Genera... | [
{
"created": "Thu, 3 Jan 2013 01:31:39 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Feb 2013 05:35:46 GMT",
"version": "v2"
}
] | 2017-02-17 | [
[
"Bambi",
"Cosimo",
""
]
] | Astrophysical black hole candidates are thought to be the Kerr black holes predicted by General Relativity, but the actual nature of these objects has still to be proven. The Kerr black hole hypothesis can be tested by observing strong gravity features and check if they are in agreement with the predictions of General ... |
1101.6073 | Khalid Saifullah | Rashida Jahangir and K. Saifullah | Thermodynamics of noncommutative BTZ black hole | null | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Thermodynamics of the BTZ black hole in noncommutative geometry is studied.
We work out the Hawking temperature and entropy which reduce to their
commutative limits when the noncommutativity parameter tends to zero. We also
discuss the range of validity of the Hawking area law in the noncommutative
case and provide g... | [
{
"created": "Mon, 31 Jan 2011 20:32:50 GMT",
"version": "v1"
}
] | 2011-02-01 | [
[
"Jahangir",
"Rashida",
""
],
[
"Saifullah",
"K.",
""
]
] | Thermodynamics of the BTZ black hole in noncommutative geometry is studied. We work out the Hawking temperature and entropy which reduce to their commutative limits when the noncommutativity parameter tends to zero. We also discuss the range of validity of the Hawking area law in the noncommutative case and provide gra... |
2311.10693 | Martin Bojowald | Martin Bojowald and Erick I. Duque | Emergent modified gravity coupled to scalar matter | 112 pages | Phys. Rev. D 109 (2024) 084006 | 10.1103/PhysRevD.109.084006 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Emergent modified gravity presents a new set of generally covariant
gravitational theories in which the space-time metric is not directly given by
one of the fundamental fields. A metric compatible with the modified dynamics
of gravity is instead derived from covariance conditions for space-time in
canonical form. Th... | [
{
"created": "Fri, 17 Nov 2023 18:27:05 GMT",
"version": "v1"
}
] | 2024-04-09 | [
[
"Bojowald",
"Martin",
""
],
[
"Duque",
"Erick I.",
""
]
] | Emergent modified gravity presents a new set of generally covariant gravitational theories in which the space-time metric is not directly given by one of the fundamental fields. A metric compatible with the modified dynamics of gravity is instead derived from covariance conditions for space-time in canonical form. This... |
gr-qc/0212109 | Dr. Anirudh Pradhan | Anirudh Pradhan and Om Prakash Pandey | Bianchi Type I Anisotropic Magnetized Cosmological Models with Varying
$\Lambda$ | 16 pages | Int.J.Mod.Phys.D12:1299-1314,2003 | 10.1142/S0218271803003761 | null | gr-qc | null | Bianchi type I magnetized cosmological models in the presence of a bulk
viscous fluid are investigated. The source of the magnetic field is due to an
electric current produced along x-axis. The distribution consists of an
electrically neutral viscous fluid with an infinite electrical conductivity.
The coefficient of ... | [
{
"created": "Thu, 26 Dec 2002 17:04:25 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Dec 2002 04:18:30 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Pradhan",
"Anirudh",
""
],
[
"Pandey",
"Om Prakash",
""
]
] | Bianchi type I magnetized cosmological models in the presence of a bulk viscous fluid are investigated. The source of the magnetic field is due to an electric current produced along x-axis. The distribution consists of an electrically neutral viscous fluid with an infinite electrical conductivity. The coefficient of bu... |
1401.2643 | Israel Quiros | Israel Quiros | On the physical consequences of a Weyl invariant theory of gravity | 31 pages, 2 figures. After a 6-years period draft rewritten to a
large extent. Aims and scope slightly modified, title changed. Improved
physical discussion including the physical implications of gauge freedom.
Figures added for better understanding. arXiv admin note: text overlap with
arXiv:1811.02458 | null | null | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we explore the physical consequences of assuming Weyl
invariance of the laws of gravity from the classical standpoint exclusively.
Actual Weyl invariance requires to replace the underlying Riemannian
geometrical structure of the background spacetimes by Weyl integrable geometry
(WIG). We show that gauge... | [
{
"created": "Sun, 12 Jan 2014 17:18:20 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Jan 2014 00:34:50 GMT",
"version": "v2"
},
{
"created": "Sun, 16 Feb 2014 01:56:17 GMT",
"version": "v3"
},
{
"created": "Wed, 7 May 2014 23:13:45 GMT",
"version": "v4"
},
{
"cr... | 2020-04-20 | [
[
"Quiros",
"Israel",
""
]
] | In this paper we explore the physical consequences of assuming Weyl invariance of the laws of gravity from the classical standpoint exclusively. Actual Weyl invariance requires to replace the underlying Riemannian geometrical structure of the background spacetimes by Weyl integrable geometry (WIG). We show that gauge f... |
2112.12504 | Germain Rousseaux | L\'eo-Paul Euv\'e (PMMH), Germain Rousseaux (PPRIME) | Non-linear Processes and Stimulated Hawking Radiation in Hydrodynamics
for Decelerating Subcritical Free Surface Flows with a Subluminal Dispersion
Relation | null | null | null | null | gr-qc physics.flu-dyn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In \cite{PRL2011}, the authors have {\it "conducted experiments in order to
verify the thermal nature of the stimulated Hawking process at a white hole
horizon in a fluid analogue gravity system"} namely the linear mode conversion
giving rise to negative energy waves i.e. the classical ingredient at the root
of the H... | [
{
"created": "Thu, 23 Dec 2021 12:55:31 GMT",
"version": "v1"
}
] | 2021-12-24 | [
[
"Euvé",
"Léo-Paul",
"",
"PMMH"
],
[
"Rousseaux",
"Germain",
"",
"PPRIME"
]
] | In \cite{PRL2011}, the authors have {\it "conducted experiments in order to verify the thermal nature of the stimulated Hawking process at a white hole horizon in a fluid analogue gravity system"} namely the linear mode conversion giving rise to negative energy waves i.e. the classical ingredient at the root of the Haw... |
1711.08470 | Markus B. Fr\"ob | Markus B. Fr\"ob, William C. C. Lima | Propagators for gauge-invariant observables in cosmology | 37 pages, clarified discussion on gauge-invariant observables and
added comments on the validity of the slow-roll expressions, matches
published version | Class. Quant. Grav. 35 (2018) 095010 | 10.1088/1361-6382/aab427 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We make a proposal for gauge-invariant observables in perturbative quantum
gravity in cosmological spacetimes, building on the recent work of Brunetti et
al. [JHEP 08 (2016) 032]. These observables are relational, and are obtained by
evaluating the field operator in a field-dependent coordinate system. We show
that i... | [
{
"created": "Wed, 22 Nov 2017 19:05:27 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Mar 2018 15:10:22 GMT",
"version": "v2"
}
] | 2018-03-28 | [
[
"Fröb",
"Markus B.",
""
],
[
"Lima",
"William C. C.",
""
]
] | We make a proposal for gauge-invariant observables in perturbative quantum gravity in cosmological spacetimes, building on the recent work of Brunetti et al. [JHEP 08 (2016) 032]. These observables are relational, and are obtained by evaluating the field operator in a field-dependent coordinate system. We show that it ... |
gr-qc/0607093 | Matteo Luca Ruggiero | Matteo Luca Ruggiero, Lorenzo Iorio | Solar System planetary orbital motions and f(R) Theories of Gravity | 6 Pages, RevTeX, minor revision, new references added, to appear in
JCAP | JCAP 0701:010,2007 | 10.1088/1475-7516/2007/01/010 | null | gr-qc astro-ph hep-th | null | In this paper we study the effects of $f(R)$ Theories of Gravity on Solar
System gravitational tests. In particular, starting from an exact solution of
the field equation in vacuum, in the Palatini formalism, we work out the
effects that the modifications to the Newtonian potential would induce on the
Keplerian orbit... | [
{
"created": "Fri, 21 Jul 2006 16:53:45 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Nov 2006 11:09:47 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Dec 2006 11:36:27 GMT",
"version": "v3"
}
] | 2010-10-27 | [
[
"Ruggiero",
"Matteo Luca",
""
],
[
"Iorio",
"Lorenzo",
""
]
] | In this paper we study the effects of $f(R)$ Theories of Gravity on Solar System gravitational tests. In particular, starting from an exact solution of the field equation in vacuum, in the Palatini formalism, we work out the effects that the modifications to the Newtonian potential would induce on the Keplerian orbital... |
2202.04658 | Miguel Correia | Miguel Correia | A covariant formulation of relativistic mechanics | 21 pages + appendices; v2: revised introduction, added conclusion.
Accepted in PRD | null | 10.1103/PhysRevD.105.084041 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | Accretion disks surrounding compact objects, and other environmental factors,
deviate satellites from geodetic motion. Unfortunately, setting up the
equations of motion for such relativistic trajectories is not as simple as in
Newtonian mechanics. The principle of general (or Lorentz) covariance and the
mass-shell co... | [
{
"created": "Wed, 9 Feb 2022 19:00:00 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Mar 2022 16:14:14 GMT",
"version": "v2"
}
] | 2022-05-04 | [
[
"Correia",
"Miguel",
""
]
] | Accretion disks surrounding compact objects, and other environmental factors, deviate satellites from geodetic motion. Unfortunately, setting up the equations of motion for such relativistic trajectories is not as simple as in Newtonian mechanics. The principle of general (or Lorentz) covariance and the mass-shell cons... |
1808.01252 | Pablo Antonio Moreno Casares | Pablo Antonio Moreno Casares | A review on Loop Quantum Gravity | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The aim of this dissertation is to review `Loop Quantum Gravity', explaining
the main structure of the theory and indicating its main open issues. We will
develop the two main lines of research for the theory: the canonical
quantization (first two chapters) and spin foams (third). The final chapter
will be devoted to... | [
{
"created": "Fri, 3 Aug 2018 16:40:34 GMT",
"version": "v1"
}
] | 2018-08-06 | [
[
"Casares",
"Pablo Antonio Moreno",
""
]
] | The aim of this dissertation is to review `Loop Quantum Gravity', explaining the main structure of the theory and indicating its main open issues. We will develop the two main lines of research for the theory: the canonical quantization (first two chapters) and spin foams (third). The final chapter will be devoted to s... |
0809.2280 | Florian Conrady | Florian Conrady and Laurent Freidel (Perimeter Inst. Theor. Phys.) | On the semiclassical limit of 4d spin foam models | 32 pages, 5 figures | Phys.Rev.D78:104023,2008 | 10.1103/PhysRevD.78.104023 | PI-QG-92 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the semiclassical properties of the Riemannian spin foam models with
Immirzi parameter that are constructed via coherent states. We show that in the
semiclassical limit the quantum spin foam amplitudes of an arbitrary
triangulation are exponentially suppressed, if the face spins do not correspond
to a discre... | [
{
"created": "Mon, 15 Sep 2008 02:44:57 GMT",
"version": "v1"
}
] | 2010-04-30 | [
[
"Conrady",
"Florian",
"",
"Perimeter Inst. Theor. Phys."
],
[
"Freidel",
"Laurent",
"",
"Perimeter Inst. Theor. Phys."
]
] | We study the semiclassical properties of the Riemannian spin foam models with Immirzi parameter that are constructed via coherent states. We show that in the semiclassical limit the quantum spin foam amplitudes of an arbitrary triangulation are exponentially suppressed, if the face spins do not correspond to a discrete... |
1502.02648 | Amin Salehi | Amin Salehi, Hossein Farajollahi, Jafar Sadeghi and M.Pourali | Phase plane analysis and statefinder diagnostic of agegraphic dark
energy in 5D Brans-Dicke cosmology | 16 pages, 17 figures. arXiv admin note: substantial text overlap with
arXiv:1201.0007 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an autonomous phase-plane describing the evolution of field
equations containing an agegraphic dark energy in 5D Brans- Dicke cosmology. To
observationally verify the numerical results, we simultaneously solve the
equations by constraining the model parameters with SNe Ia data. We find
conditions for the e... | [
{
"created": "Mon, 9 Feb 2015 20:51:40 GMT",
"version": "v1"
}
] | 2016-09-26 | [
[
"Salehi",
"Amin",
""
],
[
"Farajollahi",
"Hossein",
""
],
[
"Sadeghi",
"Jafar",
""
],
[
"Pourali",
"M.",
""
]
] | We present an autonomous phase-plane describing the evolution of field equations containing an agegraphic dark energy in 5D Brans- Dicke cosmology. To observationally verify the numerical results, we simultaneously solve the equations by constraining the model parameters with SNe Ia data. We find conditions for the exi... |
2408.02611 | Lei You | Lei You, Rui-Bo Wang, Yu-Cheng Tang, Jian-Bo Deng, Xian-Ru Hu | Thermal chaos of quantum-corrected-AdS black hole in the extended phase
space | 22 pages, 10 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We briefly analyzed the equation of state and critical points of the
quantum-corrected Schwarzschild-like black hole and used the Melnikov method to
study its thermal chaotic behavior in the extended phase space of flat, closed,
and open universes. The results show that the black hole's thermodynamic
behavior is simi... | [
{
"created": "Mon, 5 Aug 2024 16:37:46 GMT",
"version": "v1"
}
] | 2024-08-06 | [
[
"You",
"Lei",
""
],
[
"Wang",
"Rui-Bo",
""
],
[
"Tang",
"Yu-Cheng",
""
],
[
"Deng",
"Jian-Bo",
""
],
[
"Hu",
"Xian-Ru",
""
]
] | We briefly analyzed the equation of state and critical points of the quantum-corrected Schwarzschild-like black hole and used the Melnikov method to study its thermal chaotic behavior in the extended phase space of flat, closed, and open universes. The results show that the black hole's thermodynamic behavior is simila... |
1611.03812 | Maria Laura Pucheu | F. A. P. Alves-J\'unior, M. L. Pucheu, A. B. Barreto, C. Romero | Quantum cosmology in an anisotropic n-dimensional universe | 13 pages, 10 figures | Phys. Rev. D 97, 044007 (2018) | 10.1103/PhysRevD.97.044007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate quantum cosmological models in an n-dimensional anisotropic
universe in the presence of a massless scalar field. Our basic inspiration
comes from Chodos and Detweiler's classical model which predicts an interesting
behaviour of the extra dimension, shrinking down as time goes by. We work in
the framewo... | [
{
"created": "Fri, 11 Nov 2016 18:43:17 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Jul 2017 22:03:48 GMT",
"version": "v2"
},
{
"created": "Wed, 31 Jan 2018 13:19:24 GMT",
"version": "v3"
}
] | 2018-02-14 | [
[
"Alves-Júnior",
"F. A. P.",
""
],
[
"Pucheu",
"M. L.",
""
],
[
"Barreto",
"A. B.",
""
],
[
"Romero",
"C.",
""
]
] | We investigate quantum cosmological models in an n-dimensional anisotropic universe in the presence of a massless scalar field. Our basic inspiration comes from Chodos and Detweiler's classical model which predicts an interesting behaviour of the extra dimension, shrinking down as time goes by. We work in the framework... |
gr-qc/0503045 | Mauricio Bellini | Jose Edgar Madriz Aguilar (IFM, UMSNH), Mauricio Bellini (Mar del
Plata University & CONICET) | Noncompact KK theory of gravity: stochastic treatment for a
nonperturbative inflaton field in a de Sitter expansion | version to be published in Phys. Lett. B | Phys.Lett.B619:208-218,2005 | 10.1016/j.physletb.2005.05.054 | null | gr-qc astro-ph hep-ph hep-th | null | We study a stochastic formalism for a nonperturbative treatment of the
inflaton field in the framework of a noncompact Kaluza-Klein (KK) theory during
an inflationary (de Sitter) expansion, without the slow-roll approximation.
| [
{
"created": "Thu, 10 Mar 2005 19:51:33 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Mar 2005 14:02:39 GMT",
"version": "v2"
},
{
"created": "Tue, 29 Mar 2005 19:46:06 GMT",
"version": "v3"
},
{
"created": "Mon, 30 May 2005 20:48:54 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Aguilar",
"Jose Edgar Madriz",
"",
"IFM, UMSNH"
],
[
"Bellini",
"Mauricio",
"",
"Mar del\n Plata University & CONICET"
]
] | We study a stochastic formalism for a nonperturbative treatment of the inflaton field in the framework of a noncompact Kaluza-Klein (KK) theory during an inflationary (de Sitter) expansion, without the slow-roll approximation. |
gr-qc/0211011 | G. Papini | G. Papini | Shadows of a maximal acceleration | 11 pages | Phys.Lett.A305:359-364,2002 | 10.1016/S0375-9601(02)01536-0 | null | gr-qc | null | A quantum mechanical upper limit on the value of particle accelerations, or
maximal acceleration (MA), is applied to compact stars. A few MA fermions are
at most present in canonical white dwarfs and neutron stars. They drastically
alter a star's stability conditions.
| [
{
"created": "Mon, 4 Nov 2002 17:20:10 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Papini",
"G.",
""
]
] | A quantum mechanical upper limit on the value of particle accelerations, or maximal acceleration (MA), is applied to compact stars. A few MA fermions are at most present in canonical white dwarfs and neutron stars. They drastically alter a star's stability conditions. |
0712.3199 | Manuel Tessmer | M. Tessmer and A. Gopakumar | Gravitational waves from compact binaries inspiralling along
post-Newtonian accurate eccentric orbits: Data analysis implications | 12 pages, 3 figures, submitted to Phys. Rev. D | Phys.Rev.D78:084029,2008 | 10.1103/PhysRevD.78.084029 | null | gr-qc | null | Compact binaries inspiralling along eccentric orbits are plausible
gravitational wave (GW) sources for the ground-based laser interferometers. We
explore the losses in the event rates incurred when searching for GWs from
compact binaries inspiralling along post-Newtonian accurate eccentric orbits
with certain obvious... | [
{
"created": "Wed, 19 Dec 2007 14:21:08 GMT",
"version": "v1"
},
{
"created": "Fri, 23 May 2008 12:27:21 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Tessmer",
"M.",
""
],
[
"Gopakumar",
"A.",
""
]
] | Compact binaries inspiralling along eccentric orbits are plausible gravitational wave (GW) sources for the ground-based laser interferometers. We explore the losses in the event rates incurred when searching for GWs from compact binaries inspiralling along post-Newtonian accurate eccentric orbits with certain obvious n... |
0809.4752 | Sergio Zerbini | Sergio Zerbini | Stability in Generalized Modified Gravity | 6 pages, talk delivered at DSU08 Cairo | AIP Conf.Proc.1115:199-204,2009 | 10.1063/1.3131498 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The stability issue of a large class of modified gravitational models is
discussed with particular emphasis to de Sitter solutions. Three approaches are
briefly presented and the generalization to more general cases is mentioned.
| [
{
"created": "Sat, 27 Sep 2008 09:06:11 GMT",
"version": "v1"
}
] | 2009-05-01 | [
[
"Zerbini",
"Sergio",
""
]
] | The stability issue of a large class of modified gravitational models is discussed with particular emphasis to de Sitter solutions. Three approaches are briefly presented and the generalization to more general cases is mentioned. |
2102.03901 | Jonathan Engle | Christopher Beetle, Jonathan Steven Engle, Matthew Ernest Hogan, and
Phillip Mendon\c{c}a | Quantum isotropy and the reduction of dynamics in Bianchi I | 24 pages; some typos corrected, some minor presentational
improvements made, and a minor error in a proof corrected | null | 10.1088/1361-6382/ac337c | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The authors previously introduced a diffeomorphism-invariant definition of a
homogeneous and isotropic sector of loop quantum gravity, along with a program
to embed loop quantum cosmology into it. The present paper works out that
program in detail for the simpler, but still physically non-trivial, case where
the targ... | [
{
"created": "Sun, 7 Feb 2021 20:06:56 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Jul 2021 23:11:31 GMT",
"version": "v2"
}
] | 2021-12-08 | [
[
"Beetle",
"Christopher",
""
],
[
"Engle",
"Jonathan Steven",
""
],
[
"Hogan",
"Matthew Ernest",
""
],
[
"Mendonça",
"Phillip",
""
]
] | The authors previously introduced a diffeomorphism-invariant definition of a homogeneous and isotropic sector of loop quantum gravity, along with a program to embed loop quantum cosmology into it. The present paper works out that program in detail for the simpler, but still physically non-trivial, case where the target... |
gr-qc/0607130 | Martin Bojowald | Martin Bojowald | Quantum Geometry and its Implications for Black Holes | 16 pages, Plenary talk at ``Einstein's Legacy in the New Millenium,''
Puri, India, December 2005 | Int.J.Mod.Phys.D15:1545-1559,2006 | 10.1142/S0218271806008942 | IGPG-06/7-4 | gr-qc hep-th | null | General relativity successfully describes space-times at scales that we can
observe and probe today, but it cannot be complete as a consequence of
singularity theorems. For a long time there have been indications that quantum
gravity will provide a more complete, non-singular extension which, however,
was difficult t... | [
{
"created": "Fri, 28 Jul 2006 12:49:08 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bojowald",
"Martin",
""
]
] | General relativity successfully describes space-times at scales that we can observe and probe today, but it cannot be complete as a consequence of singularity theorems. For a long time there have been indications that quantum gravity will provide a more complete, non-singular extension which, however, was difficult to ... |
2203.00381 | Bhooshan Gadre | Bhooshan Gadre, Michael P\"urrer, Scott E. Field, Serguei Ossokine,
Vijay Varma | A fully precessing higher-mode surrogate model of effective-one-body
waveforms | 14 pages, 11 figures | null | null | LIGO-P2200040 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a surrogate model of \texttt{SEOBNRv4PHM}, a fully precessing
time-domain effective-one-body waveform model including subdominant modes. We
follow an approach similar to that used to build recent numerical relativity
surrogate models. Our surrogate is 5000M in duration, covers mass-ratios up to
1:20 and di... | [
{
"created": "Tue, 1 Mar 2022 12:01:53 GMT",
"version": "v1"
}
] | 2022-03-02 | [
[
"Gadre",
"Bhooshan",
""
],
[
"Pürrer",
"Michael",
""
],
[
"Field",
"Scott E.",
""
],
[
"Ossokine",
"Serguei",
""
],
[
"Varma",
"Vijay",
""
]
] | We present a surrogate model of \texttt{SEOBNRv4PHM}, a fully precessing time-domain effective-one-body waveform model including subdominant modes. We follow an approach similar to that used to build recent numerical relativity surrogate models. Our surrogate is 5000M in duration, covers mass-ratios up to 1:20 and dime... |
gr-qc/0603088 | Tomislav Prokopec | Tomislav Prokopec (Utrecht University) | A solution to the cosmological constant problem | 22 pages, LaTeX, 4 eps figures | null | null | SPIN-06-11, ITP-UU-06-13 | gr-qc astro-ph hep-ph hep-th | null | We argue that, when coupled to Einstein's theory of gravity, the Yukawa
theory may solve the cosmological constant problem in the following sense: The
radiative corrections of fermions generate an effective potential for the
scalar field, such that the effective cosmological term Lambda_eff is
dynamically driven to z... | [
{
"created": "Wed, 22 Mar 2006 15:01:29 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Prokopec",
"Tomislav",
"",
"Utrecht University"
]
] | We argue that, when coupled to Einstein's theory of gravity, the Yukawa theory may solve the cosmological constant problem in the following sense: The radiative corrections of fermions generate an effective potential for the scalar field, such that the effective cosmological term Lambda_eff is dynamically driven to zer... |
1005.2865 | Jiliang Jing | Jieci Wang and Jiliang Jing | Quantum decoherence in noninertial frames | 4 pages, 3 figures | Phys.Rev.A82:032324,2010 | 10.1103/PhysRevA.82.032324 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum decoherence, which appears when a system interacts with its
environment in an irreversible way, plays a fundamental role in the description
of quantum-to-classical transitions and has been successfully applied in some
important experiments. Here, we study the decoherence in noninertial frames for
the first ti... | [
{
"created": "Mon, 17 May 2010 10:19:37 GMT",
"version": "v1"
},
{
"created": "Sat, 22 May 2010 02:26:16 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Jul 2010 07:19:27 GMT",
"version": "v3"
},
{
"created": "Sat, 25 Sep 2010 01:44:22 GMT",
"version": "v4"
}
] | 2015-03-17 | [
[
"Wang",
"Jieci",
""
],
[
"Jing",
"Jiliang",
""
]
] | Quantum decoherence, which appears when a system interacts with its environment in an irreversible way, plays a fundamental role in the description of quantum-to-classical transitions and has been successfully applied in some important experiments. Here, we study the decoherence in noninertial frames for the first time... |
1502.01246 | Fotis Farakos | Ioannis Dalianis and Fotis Farakos | On the initial conditions for inflation with plateau potentials: the
$R+R^2$ (super)gravity case | published version | null | 10.1088/1475-7516/2015/07/044 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the initial conditions problem for inflation driven by the vacuum
energy of a plateau potential, and in particular the Starobinsky inflation. We
show that the supergravity embedding of the $R+R^2$ theory naturally decreases
the size of the acausal homogeneity, required for the low-scale inflation to
occur,... | [
{
"created": "Wed, 4 Feb 2015 16:15:20 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Mar 2015 23:53:38 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Dec 2015 08:21:56 GMT",
"version": "v3"
}
] | 2015-12-02 | [
[
"Dalianis",
"Ioannis",
""
],
[
"Farakos",
"Fotis",
""
]
] | We discuss the initial conditions problem for inflation driven by the vacuum energy of a plateau potential, and in particular the Starobinsky inflation. We show that the supergravity embedding of the $R+R^2$ theory naturally decreases the size of the acausal homogeneity, required for the low-scale inflation to occur, t... |
2404.13029 | Albert Much | Albert Much | Quantum Spacetimes from General Relativity? | null | null | null | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | We introduce a non-commutative product for curved spacetimes, that can be
regarded as a generalization of the Rieffel (or Moyal-Weyl) product. This
product employs the exponential map and a Poisson tensor, and the deformed
product maintains associativity under the condition that the Poisson tensor
$\Theta$ satisfies ... | [
{
"created": "Fri, 19 Apr 2024 17:44:10 GMT",
"version": "v1"
}
] | 2024-04-22 | [
[
"Much",
"Albert",
""
]
] | We introduce a non-commutative product for curved spacetimes, that can be regarded as a generalization of the Rieffel (or Moyal-Weyl) product. This product employs the exponential map and a Poisson tensor, and the deformed product maintains associativity under the condition that the Poisson tensor $\Theta$ satisfies $\... |
2307.14104 | Mario Martinez Dr. | M. Andr\'es-Carcasona, A. Macquet, M. Mart\'inez, Ll. M. Mir, H.
Yamamoto | Study of scattered light in the main arms of the Einstein Telescope
gravitational wave detector | 15 pages, 16 figures, 3 tables. To be submitted to PRD | null | null | null | gr-qc astro-ph.IM | http://creativecommons.org/licenses/by/4.0/ | We present an estimation of the noise induced by scattered light inside the
main arms of the Einstein Telescope (ET) gravitational wave detector. Both ET
configurations for high- and low-frequency interferometers are considered, for
which we propose baffle layouts. The level of scattered light and the ET laser
beam c... | [
{
"created": "Wed, 26 Jul 2023 11:02:49 GMT",
"version": "v1"
}
] | 2023-07-27 | [
[
"Andrés-Carcasona",
"M.",
""
],
[
"Macquet",
"A.",
""
],
[
"Martínez",
"M.",
""
],
[
"Mir",
"Ll. M.",
""
],
[
"Yamamoto",
"H.",
""
]
] | We present an estimation of the noise induced by scattered light inside the main arms of the Einstein Telescope (ET) gravitational wave detector. Both ET configurations for high- and low-frequency interferometers are considered, for which we propose baffle layouts. The level of scattered light and the ET laser beam cli... |
gr-qc/9904013 | Wai-Mo Suen | Miguel Alcubierre, Gabrielle Allen, Bernd Bruegmann, Gerd Lanfermann,
Edward Seidel, Wai-Mo Suen, and Malcolm Tobias | Gravitational Collapse of Gravitational Waves in 3D Numerical Relativity | 4 pages | Phys.Rev.D61:041501,2000 | 10.1103/PhysRevD.61.041501 | null | gr-qc | null | We demonstrate that evolutions of three-dimensional, strongly non-linear
gravitational waves can be followed in numerical relativity, hence allowing
many interesting studies of both fundamental and observational consequences. We
study the evolution of time-symmetric, axisymmetric {\it and} non-axisymmetric
Brill wave... | [
{
"created": "Tue, 6 Apr 1999 14:47:05 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Alcubierre",
"Miguel",
""
],
[
"Allen",
"Gabrielle",
""
],
[
"Bruegmann",
"Bernd",
""
],
[
"Lanfermann",
"Gerd",
""
],
[
"Seidel",
"Edward",
""
],
[
"Suen",
"Wai-Mo",
""
],
[
"Tobias",
"Malcolm",
""
]
] | We demonstrate that evolutions of three-dimensional, strongly non-linear gravitational waves can be followed in numerical relativity, hence allowing many interesting studies of both fundamental and observational consequences. We study the evolution of time-symmetric, axisymmetric {\it and} non-axisymmetric Brill waves,... |
2304.00611 | Lydia Bieri | Lydia Bieri | Radiation and Asymptotics for Spacetimes with Non-Isotropic Mass | null | null | null | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive new results on radiation, angular momentum at future null infinity
and peeling for a general class of spacetimes. For asymptotically-flat
solutions of the Einstein vacuum equations with a term homogeneous of degree
$-1$ in the initial data metric, that is it may include a non-isotropic mass
term, we prove n... | [
{
"created": "Sun, 2 Apr 2023 20:02:15 GMT",
"version": "v1"
}
] | 2023-04-04 | [
[
"Bieri",
"Lydia",
""
]
] | We derive new results on radiation, angular momentum at future null infinity and peeling for a general class of spacetimes. For asymptotically-flat solutions of the Einstein vacuum equations with a term homogeneous of degree $-1$ in the initial data metric, that is it may include a non-isotropic mass term, we prove new... |
gr-qc/0503005 | Valerio Faraoni | Valerio Faraoni and Werner Israel | Dark energy, wormholes, and the Big Rip | 15 pages, LaTeX, to appear in Phys. Rev. D | Phys.Rev. D71 (2005) 064017 | 10.1103/PhysRevD.71.064017 | null | gr-qc astro-ph | null | The time evolution of a wormhole in a Friedmann universe approaching the Big
Rip is studied. The wormhole is modeled by a thin spherical shell accreting the
superquintessence fluid - two different models are presented. Contrary to
recent claims that the wormhole overtakes the expansion of the universe and
engulfs it ... | [
{
"created": "Tue, 1 Mar 2005 17:34:18 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Faraoni",
"Valerio",
""
],
[
"Israel",
"Werner",
""
]
] | The time evolution of a wormhole in a Friedmann universe approaching the Big Rip is studied. The wormhole is modeled by a thin spherical shell accreting the superquintessence fluid - two different models are presented. Contrary to recent claims that the wormhole overtakes the expansion of the universe and engulfs it be... |
1912.02576 | Istvan Racz | Istv\'an R\'acz | On the construction of Riemannian three-spaces with smooth inverse mean
curvature foliation | 20 pages, no figure; matched to the published version | General Relativity and Gravitation (2022) 54:55 | 10.1007/s10714-022-02937-0 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Consider a one-parameter family of smooth Riemannian metrics on a two-sphere,
$\mathscr{S}$. By choosing a one-parameter family of smooth lapse and shift,
these Riemannian two-spheres can always be assembled into smooth Riemannian
three-space, with metric $h_{ij}$ on a three-manifold $\Sigma$ foliated by a
one-parame... | [
{
"created": "Thu, 5 Dec 2019 13:48:06 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Dec 2019 22:38:15 GMT",
"version": "v2"
},
{
"created": "Tue, 11 Aug 2020 10:34:16 GMT",
"version": "v3"
},
{
"created": "Wed, 8 Jun 2022 19:44:34 GMT",
"version": "v4"
}
] | 2022-06-10 | [
[
"Rácz",
"István",
""
]
] | Consider a one-parameter family of smooth Riemannian metrics on a two-sphere, $\mathscr{S}$. By choosing a one-parameter family of smooth lapse and shift, these Riemannian two-spheres can always be assembled into smooth Riemannian three-space, with metric $h_{ij}$ on a three-manifold $\Sigma$ foliated by a one-paramete... |
1002.4275 | Pisin Chen | Pisin Chen | Gauge Theory of Gravity with de Sitter Symmetry as a Solution to the
Cosmological Constant Problem and the Dark Energy Puzzle | 8 pages | Modern Physics Letters A Vol. 25, No. 33 (2010) 2795--2803 | 10.1142/S0217732310034274 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a solution to the longstanding cosmological constant (CC) problem
which is based on the fusion of two existing concepts. The first is the
suggestion that the proper description of classical gravitational effects is
the gauge theory of gravity in which the connection instead of the metric acts
as the dynami... | [
{
"created": "Tue, 23 Feb 2010 16:28:19 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jul 2010 23:28:05 GMT",
"version": "v2"
}
] | 2011-09-05 | [
[
"Chen",
"Pisin",
""
]
] | We propose a solution to the longstanding cosmological constant (CC) problem which is based on the fusion of two existing concepts. The first is the suggestion that the proper description of classical gravitational effects is the gauge theory of gravity in which the connection instead of the metric acts as the dynamica... |
1502.04646 | Eric Woolgar | Gregory J Galloway and Eric Woolgar | On static Poincar\'e-Einstein metrics | Trivial correction to equation 2.1 (published version does not
contain this correction) | JHEP 6 (2015) 051 | null | null | gr-qc hep-th math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The classification of solutions of the static vacuum Einstein equations, on a
given closed manifold or an asymptotically flat one, is a long-standing and
much-studied problem. Solutions are characterized by a complete Riemannian
$n$-manifold $(M,g)$ and a positive function $N$, called the lapse. We study
this problem... | [
{
"created": "Mon, 16 Feb 2015 17:38:00 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Apr 2015 01:51:45 GMT",
"version": "v2"
},
{
"created": "Mon, 21 May 2018 18:00:05 GMT",
"version": "v3"
}
] | 2018-05-23 | [
[
"Galloway",
"Gregory J",
""
],
[
"Woolgar",
"Eric",
""
]
] | The classification of solutions of the static vacuum Einstein equations, on a given closed manifold or an asymptotically flat one, is a long-standing and much-studied problem. Solutions are characterized by a complete Riemannian $n$-manifold $(M,g)$ and a positive function $N$, called the lapse. We study this problem o... |
gr-qc/0503026 | Marcello Ortaggio | Marcello Ortaggio, Pavel Krtous, Jiri Podolsky | Ultrarelativistic boost of the black ring | 10 pages, 2 figures, REVTeX 4. v2: added boost in an arbitrary
direction, one new figure, one new reference. To appear in Phys. Rev. D | Phys.Rev. D71 (2005) 124031 | 10.1103/PhysRevD.71.124031 | null | gr-qc hep-th | null | We investigate the ultrarelativistic boost of the five-dimensional
Emparan-Reall non-rotating black ring. Following the classical method of
Aichelburg and Sexl, we determine the gravitational field generated by a black
ring moving ``with the speed of light'' in an arbitrary direction. In
particular, we study in detai... | [
{
"created": "Mon, 7 Mar 2005 17:13:02 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Jun 2005 18:06:00 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Ortaggio",
"Marcello",
""
],
[
"Krtous",
"Pavel",
""
],
[
"Podolsky",
"Jiri",
""
]
] | We investigate the ultrarelativistic boost of the five-dimensional Emparan-Reall non-rotating black ring. Following the classical method of Aichelburg and Sexl, we determine the gravitational field generated by a black ring moving ``with the speed of light'' in an arbitrary direction. In particular, we study in detail ... |
1911.03901 | S. M. M. Rasouli | S. M. M. Rasouli, R. Pacheco, M. Sakellariadou and P. V. Moniz | Late time cosmic acceleration in modified S\'{a}ez-Ballester theory | 19 pages, 1 figure | Physics of the Dark Universe 27 (2020) 100446 | 10.1016/j.dark.2019.100446 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We establish an extended version of the modified S\'{a}ez-Ballester (SB)
scalar-tensor theory in arbitrary dimensions whose energy momentum tensor as
well as potential are pure geometrical quantities. This scenario emerges by
means of two scalar fields (one is present in the SB theory and the other is
associated with... | [
{
"created": "Sun, 10 Nov 2019 11:12:31 GMT",
"version": "v1"
},
{
"created": "Sun, 5 Jan 2020 09:58:20 GMT",
"version": "v2"
}
] | 2020-01-07 | [
[
"Rasouli",
"S. M. M.",
""
],
[
"Pacheco",
"R.",
""
],
[
"Sakellariadou",
"M.",
""
],
[
"Moniz",
"P. V.",
""
]
] | We establish an extended version of the modified S\'{a}ez-Ballester (SB) scalar-tensor theory in arbitrary dimensions whose energy momentum tensor as well as potential are pure geometrical quantities. This scenario emerges by means of two scalar fields (one is present in the SB theory and the other is associated with t... |
1805.11288 | Cedric Troessaert | Marc Henneaux and C\'edric Troessaert | Hamiltonian structure and asymptotic symmetries of the Einstein-Maxwell
system at spatial infinity | 23 pages | null | 10.1007/JHEP07(2018)171 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new set of asymptotic conditions for gravity at spatial infinity
that includes gravitational magnetic-type solutions, allows for a non-trivial
Hamiltonian action of the complete $BMS_4$ algebra, and leads to a
non-divergent behaviour of the Weyl tensor as one approaches null infinity. We
then extend the ... | [
{
"created": "Tue, 29 May 2018 08:04:14 GMT",
"version": "v1"
}
] | 2018-08-15 | [
[
"Henneaux",
"Marc",
""
],
[
"Troessaert",
"Cédric",
""
]
] | We present a new set of asymptotic conditions for gravity at spatial infinity that includes gravitational magnetic-type solutions, allows for a non-trivial Hamiltonian action of the complete $BMS_4$ algebra, and leads to a non-divergent behaviour of the Weyl tensor as one approaches null infinity. We then extend the an... |
2401.09170 | Pierre Mourier | Pierre Mourier and Asta Heinesen | Splitting the spacetime: A systematic analysis of foliation dependence
in cosmic averaging | 34 pages. Updated version with minor revisions | null | null | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | It is a fundamental unsolved question in general relativity how to
unambiguously characterize the effective collective dynamics of an ensemble of
fluid elements sourcing the local geometry, in the absence of exact symmetries.
In a cosmological context this is sometimes referred to as the averaging
problem. At the hea... | [
{
"created": "Wed, 17 Jan 2024 12:23:06 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Feb 2024 18:28:32 GMT",
"version": "v2"
}
] | 2024-03-01 | [
[
"Mourier",
"Pierre",
""
],
[
"Heinesen",
"Asta",
""
]
] | It is a fundamental unsolved question in general relativity how to unambiguously characterize the effective collective dynamics of an ensemble of fluid elements sourcing the local geometry, in the absence of exact symmetries. In a cosmological context this is sometimes referred to as the averaging problem. At the heart... |
2308.16604 | Surajit Kalita | Surajit Kalita, Shruti Bhatporia, Amanda Weltman | Gravitational Lensing in Modified Gravity: A case study for Fast Radio
Bursts | 16 pages with 4 figures; version accepted for publication in JCAP | JCAP 11 (2023) 059 | 10.1088/1475-7516/2023/11/059 | null | gr-qc astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Over the last few decades, a plethora of modifications to general relativity
have been proposed to solve a host of cosmological and astrophysical problems.
Many modified gravity models are now ruled out with further astrophysical
observations; some theories are still viable, with, at best, bounds on their
parameters ... | [
{
"created": "Thu, 31 Aug 2023 10:06:27 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Oct 2023 09:45:37 GMT",
"version": "v2"
}
] | 2023-11-15 | [
[
"Kalita",
"Surajit",
""
],
[
"Bhatporia",
"Shruti",
""
],
[
"Weltman",
"Amanda",
""
]
] | Over the last few decades, a plethora of modifications to general relativity have been proposed to solve a host of cosmological and astrophysical problems. Many modified gravity models are now ruled out with further astrophysical observations; some theories are still viable, with, at best, bounds on their parameters se... |
gr-qc/9304004 | Robert Bartnik | Robert Bartnik and Gyula Fodor | Proof of the Thin Sandwich Conjecture | 8 pages | Phys.Rev. D48 (1993) 3596-3599 | 10.1103/PhysRevD.48.3596 | null | gr-qc | null | We prove that the Thin Sandwich Conjecture in general relativity is valid,
provided that the data $(g_{ab},\dot g_{ab})$ satisfy certain geometric
conditions. These conditions define an open set in the class of possible data,
but are not generically satisfied. The implications for the ``superspace''
picture of the Ei... | [
{
"created": "Sun, 4 Apr 1993 23:49:15 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Bartnik",
"Robert",
""
],
[
"Fodor",
"Gyula",
""
]
] | We prove that the Thin Sandwich Conjecture in general relativity is valid, provided that the data $(g_{ab},\dot g_{ab})$ satisfy certain geometric conditions. These conditions define an open set in the class of possible data, but are not generically satisfied. The implications for the ``superspace'' picture of the Eins... |
1903.10121 | Keisuke Nakashi | Keisuke Nakashi and Takahisa Igata | Innermost stable circular orbits in Majumdar--Papapetrou dihole
spacetime | 13 pages, 2 figures | Phys. Rev. D 99, 124033 (2019) | 10.1103/PhysRevD.99.124033 | RUP-19-10 | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the positions of stable circular massive particle orbits in
the Majumdar--Papapetrou dihole spacetime with equal mass. In terms of
qualitative differences of their sequences, we classify the dihole separation
into five ranges and find four critical values as the boundaries. When the
separation is relat... | [
{
"created": "Mon, 25 Mar 2019 03:48:26 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Jun 2019 10:33:24 GMT",
"version": "v2"
}
] | 2019-06-27 | [
[
"Nakashi",
"Keisuke",
""
],
[
"Igata",
"Takahisa",
""
]
] | We investigate the positions of stable circular massive particle orbits in the Majumdar--Papapetrou dihole spacetime with equal mass. In terms of qualitative differences of their sequences, we classify the dihole separation into five ranges and find four critical values as the boundaries. When the separation is relativ... |
1302.2262 | Roldao da Rocha | Roldao da Rocha, Luca Fabbri, J. M. Hoff da Silva, R. T. Cavalcanti,
J. A. Silva-Neto | Flag-Dipole Spinor Fields in ESK Gravities | 18 pages, improved version | J. Math. Phys. 54 (2013) 102505 | 10.1063/1.4826499 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the Riemann-Cartan geometry as a basis for the
Einstein-Sciama-Kibble theory coupled to spinor fields: we focus on $f(R)$ and
conformal gravities, regarding the flag-dipole spinor fields, type-(4) spinor
fields under the Lounesto classification. We study such theories in specific
cases given for instance ... | [
{
"created": "Sat, 9 Feb 2013 19:45:15 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Oct 2013 21:04:45 GMT",
"version": "v2"
}
] | 2013-10-31 | [
[
"da Rocha",
"Roldao",
""
],
[
"Fabbri",
"Luca",
""
],
[
"da Silva",
"J. M. Hoff",
""
],
[
"Cavalcanti",
"R. T.",
""
],
[
"Silva-Neto",
"J. A.",
""
]
] | We consider the Riemann-Cartan geometry as a basis for the Einstein-Sciama-Kibble theory coupled to spinor fields: we focus on $f(R)$ and conformal gravities, regarding the flag-dipole spinor fields, type-(4) spinor fields under the Lounesto classification. We study such theories in specific cases given for instance by... |
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