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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1006.4522 | Sebastien Clesse | Sebastien Clesse | Hybrid inflation along waterfall trajectories | 10 pages, 5 figures, section III-A on quantum backreactions more
detailed, comments on transverse field gradient contribution added, version
accepted for publication in Phys.Rev.D | Phys.Rev.D83:063518,2011 | 10.1103/PhysRevD.83.063518 | ULB-TH/10-22, CP3-10-24 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We identify a new inflationary regime for which more than 60 e-folds are
generated classically during the waterfall phase occuring after the usual
hybrid inflation. By performing a bayesian Monte-Carlo-Markov-Chain analysis,
this scenario is shown to take place in a large part of the parameter space of
the model. Whe... | [
{
"created": "Wed, 23 Jun 2010 13:57:59 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Sep 2010 12:37:57 GMT",
"version": "v2"
},
{
"created": "Mon, 28 Feb 2011 14:57:01 GMT",
"version": "v3"
}
] | 2011-03-22 | [
[
"Clesse",
"Sebastien",
""
]
] | We identify a new inflationary regime for which more than 60 e-folds are generated classically during the waterfall phase occuring after the usual hybrid inflation. By performing a bayesian Monte-Carlo-Markov-Chain analysis, this scenario is shown to take place in a large part of the parameter space of the model. When ... |
0901.0945 | Steven L. Maxson | Steven Maxson | Energy Conservation in Flat FRW Cosmology | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The consequence of energy conservation in the flat
Friedmannn-Robertson-Walker (FRW) cosmology is a strictly positive accelerating
expansion. A mechanism is proposed for this expansion due to the effect of the
attractive (negative) gravitational potential of matter as it is being included
within the expanding horizon... | [
{
"created": "Wed, 7 Jan 2009 22:37:04 GMT",
"version": "v1"
}
] | 2009-01-09 | [
[
"Maxson",
"Steven",
""
]
] | The consequence of energy conservation in the flat Friedmannn-Robertson-Walker (FRW) cosmology is a strictly positive accelerating expansion. A mechanism is proposed for this expansion due to the effect of the attractive (negative) gravitational potential of matter as it is being included within the expanding horizon, ... |
1710.10486 | Pierre-Henri Chavanis | Abril Su\'arez and Pierre-Henri Chavanis | Jeans type instability of a complex self-interacting scalar field in
general relativity | null | Phys. Rev. D 98, 083529 (2018) | 10.1103/PhysRevD.98.083529 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the gravitational instability of a general relativistic complex
scalar field with a quartic self-interaction in an infinite homogeneous static
background. This quantum relativistic Jeans problem provides a simplified
framework to study the formation of the large-scale structures of the Universe
in the case w... | [
{
"created": "Sat, 28 Oct 2017 15:59:10 GMT",
"version": "v1"
}
] | 2018-10-24 | [
[
"Suárez",
"Abril",
""
],
[
"Chavanis",
"Pierre-Henri",
""
]
] | We study the gravitational instability of a general relativistic complex scalar field with a quartic self-interaction in an infinite homogeneous static background. This quantum relativistic Jeans problem provides a simplified framework to study the formation of the large-scale structures of the Universe in the case whe... |
1505.04753 | Theodore A. Jacobson | Ted Jacobson | Entanglement Equilibrium and the Einstein Equation | 8 pages; v2: reorganized and rewritten; figure added; v3:
reorganized; assumed conjecture weakened; noted that the derivation holds
only for first order variations of the quantum field vacuum; v4: published
version; introduction rewritten; results of arXiv:1601.00528 and
arXiv:1602.01380 required that curvature... | Phys. Rev. Lett. 116, 201101 (2016) | 10.1103/PhysRevLett.116.201101 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A link between the semiclassical Einstein equation and a maximal vacuum
entanglement hypothesis is established. The hypothesis asserts that
entanglement entropy in small geodesic balls is maximized at fixed volume in a
locally maximally symmetric vacuum state of geometry and quantum fields. A
qualitative argument sug... | [
{
"created": "Mon, 18 May 2015 18:36:42 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Jul 2015 04:54:45 GMT",
"version": "v2"
},
{
"created": "Mon, 21 Dec 2015 04:51:32 GMT",
"version": "v3"
},
{
"created": "Sat, 25 Jun 2016 06:05:34 GMT",
"version": "v4"
}
] | 2016-06-28 | [
[
"Jacobson",
"Ted",
""
]
] | A link between the semiclassical Einstein equation and a maximal vacuum entanglement hypothesis is established. The hypothesis asserts that entanglement entropy in small geodesic balls is maximized at fixed volume in a locally maximally symmetric vacuum state of geometry and quantum fields. A qualitative argument sugge... |
1908.03897 | Alessia Platania | Alessia Platania | The inflationary mechanism in Asymptotically Safe Gravity | Prepared for proceedings of the workshop "Quantum Fields - From
Fundamental Concepts to Phenomenological Questions"; 16 pages, 1 figure | null | null | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | According to the asymptotic safety conjecture, gravity is a renormalizable
quantum field theory whose continuum limit is defined by an interacting fixed
point of the renormalization group flow. In these proceedings we review some
implications of the existence of this non-trivial fixed point in cosmological
contexts. ... | [
{
"created": "Sun, 11 Aug 2019 12:45:07 GMT",
"version": "v1"
}
] | 2019-08-13 | [
[
"Platania",
"Alessia",
""
]
] | According to the asymptotic safety conjecture, gravity is a renormalizable quantum field theory whose continuum limit is defined by an interacting fixed point of the renormalization group flow. In these proceedings we review some implications of the existence of this non-trivial fixed point in cosmological contexts. Sp... |
1601.00283 | Jibitesh Dutta | Jibitesh Dutta and H. Zonunmawia | Complete cosmic scenario in the Randall-Sundrum braneworld from the
dynamical systems perspective | 18 pages, 9 figures, Published | The European Physical Journal Plus 130:221 (2015) | 10.1140/epjp/i2015-15221-3 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The paper deals with dynamical system analysis of a coupled scalar field in
the Randall-Sundrum(RS)2 brane world. The late time attractor describes the
final state of the cosmic evolution. In RS2 based phantom model there is no
late-time attractor and consequently there is uncertainty in cosmic evolution.
In this pap... | [
{
"created": "Sun, 3 Jan 2016 11:40:04 GMT",
"version": "v1"
}
] | 2016-01-05 | [
[
"Dutta",
"Jibitesh",
""
],
[
"Zonunmawia",
"H.",
""
]
] | The paper deals with dynamical system analysis of a coupled scalar field in the Randall-Sundrum(RS)2 brane world. The late time attractor describes the final state of the cosmic evolution. In RS2 based phantom model there is no late-time attractor and consequently there is uncertainty in cosmic evolution. In this paper... |
2112.07490 | Quentin Baghi | Quentin Baghi, Natalia Korsakova, Jacob Slutsky, Eleonora Castelli,
Nikolaos Karnesis, Jean-Baptiste Bayle | Detection and characterization of instrumental transients in LISA
Pathfinder and their projection to LISA | 14 pages, 12 figures, to be submitted to PRD | null | 10.1103/PhysRevD.105.042002 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The LISA Pathfinder (LPF) mission succeeded outstandingly in demonstrating
key technological aspects of future space-borne gravitational-wave detectors,
such as the Laser Interferometer Space Antenna (LISA). Specifically, LPF
demonstrated with unprecedented sensitivity the measurement of the relative
acceleration of ... | [
{
"created": "Tue, 14 Dec 2021 15:56:46 GMT",
"version": "v1"
}
] | 2022-03-02 | [
[
"Baghi",
"Quentin",
""
],
[
"Korsakova",
"Natalia",
""
],
[
"Slutsky",
"Jacob",
""
],
[
"Castelli",
"Eleonora",
""
],
[
"Karnesis",
"Nikolaos",
""
],
[
"Bayle",
"Jean-Baptiste",
""
]
] | The LISA Pathfinder (LPF) mission succeeded outstandingly in demonstrating key technological aspects of future space-borne gravitational-wave detectors, such as the Laser Interferometer Space Antenna (LISA). Specifically, LPF demonstrated with unprecedented sensitivity the measurement of the relative acceleration of tw... |
1411.3293 | Waleed El Hanafy | G.G.L. Nashed, W. El Hanafy and Sh.Kh. Ibrahim | Graceful Exit Inflation in $f(T)$ Gravity | 22 pages, 6 Figures and 1 Table. Section 7 has been added. The list
of references has been updated | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply a quadratic teleparallel torsion scalar of the $f(T)=T+\alpha T^{2}$
field equations to the spatially flat Friedmann-Robertson-Walker (FRW) model.
We assume two perfect fluid components, the matter component has a fixed
equation of state (EoS) parameter $\omega$, while the torsion component has a
dynamical E... | [
{
"created": "Sun, 9 Nov 2014 16:36:14 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Apr 2015 11:24:40 GMT",
"version": "v2"
}
] | 2015-04-07 | [
[
"Nashed",
"G. G. L.",
""
],
[
"Hanafy",
"W. El",
""
],
[
"Ibrahim",
"Sh. Kh.",
""
]
] | We apply a quadratic teleparallel torsion scalar of the $f(T)=T+\alpha T^{2}$ field equations to the spatially flat Friedmann-Robertson-Walker (FRW) model. We assume two perfect fluid components, the matter component has a fixed equation of state (EoS) parameter $\omega$, while the torsion component has a dynamical EoS... |
1210.2958 | Abdul Hussein Mroue | Abdul H. Mrou\'e, Harald P. Pfeiffer | Precessing Binary Black Holes Simulations: Quasicircular Initial Data | 19 pages, 12 figures, 6 Tables | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In numerical evolutions of binary black holes (BBH) it is desirable to easily
control the orbital eccentricity of the BBH, and the number of orbits completed
by the binary through merger. This paper presents fitting formulae that allow
to choose initial-data parameters for generic precessing BBH resulting in an
orbit... | [
{
"created": "Wed, 10 Oct 2012 15:36:15 GMT",
"version": "v1"
}
] | 2012-10-11 | [
[
"Mroué",
"Abdul H.",
""
],
[
"Pfeiffer",
"Harald P.",
""
]
] | In numerical evolutions of binary black holes (BBH) it is desirable to easily control the orbital eccentricity of the BBH, and the number of orbits completed by the binary through merger. This paper presents fitting formulae that allow to choose initial-data parameters for generic precessing BBH resulting in an orbital... |
0910.2841 | Andrea Geralico | Donato Bini, Pierluigi Fortini, Andrea Geralico and Antonello Ortolan | Quadrupole effects on the motion of extended bodies in Schwarzschild
spacetime | 9 pages, latex iopart class document, no figures. Note that the
second term in the rhs of Eq. (1.2) was misprinted in the published version
of the paper [Classical and Quantum Gravity, Vol. 25, 035005 (2008)]. The
results are but correct | Class.Quant.Grav.25:035005,2008 | 10.1088/0264-9381/25/3/035005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The motion of an extended body up to the quadrupolar structure is studied in
the Schwarzschild background following Dixon's model and within certain
restrictions (constant frame components for the spin and the quadrupole tensor,
center of mass moving along a circular orbit, etc.). We find a number of
interesting situ... | [
{
"created": "Thu, 15 Oct 2009 11:26:10 GMT",
"version": "v1"
}
] | 2009-11-05 | [
[
"Bini",
"Donato",
""
],
[
"Fortini",
"Pierluigi",
""
],
[
"Geralico",
"Andrea",
""
],
[
"Ortolan",
"Antonello",
""
]
] | The motion of an extended body up to the quadrupolar structure is studied in the Schwarzschild background following Dixon's model and within certain restrictions (constant frame components for the spin and the quadrupole tensor, center of mass moving along a circular orbit, etc.). We find a number of interesting situat... |
1602.08366 | Chung Tai Marco Ho | C. T. Marco Ho, Daiqin Su, Robert B. Mann and Timothy C. Ralph | Black Hole Field Theory with a Firewall in two spacetime dimensions | 6 pages, 3 figures | Phys. Rev. D 94, 081502(R) (2016) | 10.1103/PhysRevD.94.081502 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose that the vacuum state of a scalar field around a black hole is a
modified Unruh vacuum. In (1+1) dimensions, we show that a free-faller close to
such an horizon can be modelled as an inertial observer in a modified Minkowski
vacuum. The modification allows for information-leaking correlations at high
frequ... | [
{
"created": "Fri, 26 Feb 2016 15:30:51 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Oct 2016 00:49:52 GMT",
"version": "v2"
}
] | 2016-10-13 | [
[
"Ho",
"C. T. Marco",
""
],
[
"Su",
"Daiqin",
""
],
[
"Mann",
"Robert B.",
""
],
[
"Ralph",
"Timothy C.",
""
]
] | We propose that the vacuum state of a scalar field around a black hole is a modified Unruh vacuum. In (1+1) dimensions, we show that a free-faller close to such an horizon can be modelled as an inertial observer in a modified Minkowski vacuum. The modification allows for information-leaking correlations at high frequen... |
gr-qc/0308050 | M. Alessandra Papa | The LIGO Scientific Collaboration: B.Abbott, et al | Setting upper limits on the strength of periodic gravitational waves
using the first science data from the GEO600 and LIGO detectors | 16 pages,8 figures | Phys.Rev.D69:082004,2004 | 10.1103/PhysRevD.69.082004 | LIGO-P030008-E-Z | gr-qc | null | Data collected by the GEO600 and LIGO interferometric gravitational wave
detectors during their first observational science run were searched for
continuous gravitational waves from the pulsar J1939+2134 at twice its rotation
frequency. Two independent analysis methods were used and are demonstrated in
this paper: a ... | [
{
"created": "Thu, 14 Aug 2003 22:31:14 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"The LIGO Scientific Collaboration",
"",
""
],
[
"Abbott",
"B.",
""
]
] | Data collected by the GEO600 and LIGO interferometric gravitational wave detectors during their first observational science run were searched for continuous gravitational waves from the pulsar J1939+2134 at twice its rotation frequency. Two independent analysis methods were used and are demonstrated in this paper: a fr... |
0708.2258 | Kishore Ananda N | Kishore N. Ananda, S. Carloni and P. K. S. Dunsby | The evolution of cosmological gravitational waves in f(R) gravity | 19 pages, 4 figures; v2: corrected to match version accepted for
publication in PRD | Phys.Rev.D77:024033,2008 | 10.1103/PhysRevD.77.024033 | null | gr-qc astro-ph | null | We give a rigorous and mathematically clear presentation of the Covariant and
Gauge Invariant theory of gravitational waves in a perturbed
Friedmann-Lemaitre-Robertson-Walker universe for Fourth Order Gravity, where
the matter is described by a perfect fluid with a barotropic equation of state.
As an example of a con... | [
{
"created": "Thu, 16 Aug 2007 18:03:15 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Jan 2008 15:37:50 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Ananda",
"Kishore N.",
""
],
[
"Carloni",
"S.",
""
],
[
"Dunsby",
"P. K. S.",
""
]
] | We give a rigorous and mathematically clear presentation of the Covariant and Gauge Invariant theory of gravitational waves in a perturbed Friedmann-Lemaitre-Robertson-Walker universe for Fourth Order Gravity, where the matter is described by a perfect fluid with a barotropic equation of state. As an example of a consi... |
gr-qc/0402057 | Stephen C. Anco | Stephen C. Anco | Mean curvature flow and quasilocal mass for two-surfaces in Hamiltonian
General Relativity | Revised version, includes an analysis of null flows with applications
to mass and angular momentum for apparent horizons | J.Math.Phys.48:052502,2007 | 10.1063/1.2728888 | null | gr-qc | null | A family of quasilocal mass definitions that includes as special cases the
Hawking mass and the Brown-York ``rest mass'' energy is derived for spacelike
2-surfaces in spacetime. The definitions involve an integral of powers of the
norm of the spacetime mean curvature vector of the 2-surface, whose properties
are conn... | [
{
"created": "Thu, 12 Feb 2004 17:10:41 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Dec 2006 18:36:40 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Anco",
"Stephen C.",
""
]
] | A family of quasilocal mass definitions that includes as special cases the Hawking mass and the Brown-York ``rest mass'' energy is derived for spacelike 2-surfaces in spacetime. The definitions involve an integral of powers of the norm of the spacetime mean curvature vector of the 2-surface, whose properties are connec... |
1910.08746 | Poulami Dutta Roy | Poulami Dutta Roy, S. Aneesh and Sayan Kar | Revisiting a family of wormholes: geometry, matter, scalar quasinormal
modes and echoes | Revised version. Title changed. More compact presentation with
additions. To appear in European Physical Journal C | null | null | null | gr-qc hep-th physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit a family of ultra-static Lorentzian wormholes which includes
Ellis-Bronnikov spacetime as a special case. We first show how the required
total matter stress energy (which violates the local energy conditions) may be
split into a part due to a phantom scalar and another extra piece (which
vanishes for Ellis... | [
{
"created": "Sat, 19 Oct 2019 11:04:58 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Mar 2020 12:05:00 GMT",
"version": "v2"
},
{
"created": "Tue, 25 Aug 2020 05:01:14 GMT",
"version": "v3"
}
] | 2020-08-26 | [
[
"Roy",
"Poulami Dutta",
""
],
[
"Aneesh",
"S.",
""
],
[
"Kar",
"Sayan",
""
]
] | We revisit a family of ultra-static Lorentzian wormholes which includes Ellis-Bronnikov spacetime as a special case. We first show how the required total matter stress energy (which violates the local energy conditions) may be split into a part due to a phantom scalar and another extra piece (which vanishes for Ellis--... |
0708.1572 | David Delphenich | D. H. Delphenich | Groups of motions and mechanics I: point mechanics | 51 pages, no figures | null | null | null | gr-qc math-ph math.MP | null | It is shown that physical mechanics for pointlike bodies can be effectively
modeled in terms of the action of transformation groups that act as symmetries
of the solutions of systems of differential equations that describe the
integrability of dynamical states. The equations of motion are then obtained
from these int... | [
{
"created": "Mon, 13 Aug 2007 15:08:41 GMT",
"version": "v1"
}
] | 2007-08-14 | [
[
"Delphenich",
"D. H.",
""
]
] | It is shown that physical mechanics for pointlike bodies can be effectively modeled in terms of the action of transformation groups that act as symmetries of the solutions of systems of differential equations that describe the integrability of dynamical states. The equations of motion are then obtained from these integ... |
1606.03112 | Leon Heller | Leon Heller | Absorption of a Particle by a Rotating Black Hole: The Potential Barrier | 8 pages, 2 figures | null | 10.1142/S0217751X16501347 | LA-UR-16-23309 | gr-qc | http://creativecommons.org/licenses/by/4.0/ | For a test particle approaching a rapidly rotating black hole we find a range
of values of the particle's energy and angular momentum, on the order of 1\% or
more of the corresponding values of the hole, such that three conditions are
satisfied. 1) The particle can reach the horizon. 2) After absorption the new
hole ... | [
{
"created": "Thu, 9 Jun 2016 20:38:38 GMT",
"version": "v1"
}
] | 2016-09-21 | [
[
"Heller",
"Leon",
""
]
] | For a test particle approaching a rapidly rotating black hole we find a range of values of the particle's energy and angular momentum, on the order of 1\% or more of the corresponding values of the hole, such that three conditions are satisfied. 1) The particle can reach the horizon. 2) After absorption the new hole st... |
gr-qc/0603129 | Alexander Kamenshchik | Francesco Cannata, Alexander Y. Kamenshchik | Networks of cosmological histories, crossing of the phantom divide line
and potentials with cusps | null | Int.J.Mod.Phys.D16:1683-1704,2007 | 10.1142/S0218271807010961 | null | gr-qc astro-ph hep-th | null | We discuss the phenomenon of the smooth dynamical gravity induced crossing of
the phantom divide line in a framework of simple cosmological models where it
appears to occur rather naturally, provided the potential of the unique scalar
field has some kind of cusp. The behavior of cosmological trajectories in the
vicin... | [
{
"created": "Fri, 31 Mar 2006 08:59:46 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Cannata",
"Francesco",
""
],
[
"Kamenshchik",
"Alexander Y.",
""
]
] | We discuss the phenomenon of the smooth dynamical gravity induced crossing of the phantom divide line in a framework of simple cosmological models where it appears to occur rather naturally, provided the potential of the unique scalar field has some kind of cusp. The behavior of cosmological trajectories in the vicinit... |
1404.2803 | Nelson Videla Dr. | Ram\'on Herrera, Marco Olivares, and Nelson Videla | General dissipative coefficient in warm intermediate inflation in loop
quantum cosmology in light of Planck and BICEP2 | 24 pages, 3 figures, version accepted for publication. arXiv admin
note: text overlap with arXiv:1310.0780 | International Journal of Modern Physics D Vol. 23, No. 10 (2014)
1450080 | 10.1142/S0218271814500801 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study a warm intermediate inflationary model with a general
form for the dissipative coefficient $\Gamma(T,\phi)=C_\phi\,T^{m}/\phi^{m-1}$
in the context of loop quantum cosmology. We examine this model in the weak and
strong dissipative regimes. In general, we discuss in great detail the
characteri... | [
{
"created": "Thu, 10 Apr 2014 13:48:16 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Apr 2014 01:29:45 GMT",
"version": "v2"
},
{
"created": "Sat, 30 Aug 2014 01:02:38 GMT",
"version": "v3"
}
] | 2014-09-02 | [
[
"Herrera",
"Ramón",
""
],
[
"Olivares",
"Marco",
""
],
[
"Videla",
"Nelson",
""
]
] | In this paper, we study a warm intermediate inflationary model with a general form for the dissipative coefficient $\Gamma(T,\phi)=C_\phi\,T^{m}/\phi^{m-1}$ in the context of loop quantum cosmology. We examine this model in the weak and strong dissipative regimes. In general, we discuss in great detail the characterist... |
1704.00603 | Ali \"Ovg\"un Dr. | Ali \"Ovg\"un, Ayan Banerjee and Kimet Jusufi | Charged Thin-shell Gravastars in Noncommutative Geometry | 8 pages, twocolumn, Accepted in EPJC for publication | Eur. Phys. J. C (2017) 77:566 | 10.1140/epjc/s10052-017-5139-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we construct a charged thin-shell gravastar model within the
context of noncommutative geometry. To do so, we choose the interior of the
nonsingular de Sitter spacetime with an exterior charged noncommutative
solution by cut-and-paste technique and apply the generalized junction
conditions. We then inve... | [
{
"created": "Thu, 30 Mar 2017 15:54:39 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Aug 2017 03:03:26 GMT",
"version": "v2"
}
] | 2017-08-24 | [
[
"Övgün",
"Ali",
""
],
[
"Banerjee",
"Ayan",
""
],
[
"Jusufi",
"Kimet",
""
]
] | In this paper we construct a charged thin-shell gravastar model within the context of noncommutative geometry. To do so, we choose the interior of the nonsingular de Sitter spacetime with an exterior charged noncommutative solution by cut-and-paste technique and apply the generalized junction conditions. We then invest... |
1207.0637 | Joao Magueijo | Joao Magueijo and Laura Bethke | New ground state for quantum gravity | null | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we conjecture the existence of a new "ground" state in quantum
gravity, supplying a wave function for the inflationary Universe. We present
its explicit perturbative expression in the connection representation,
exhibiting the associated inner product. The state is chiral, dependent on the
Immirzi parame... | [
{
"created": "Tue, 3 Jul 2012 11:15:20 GMT",
"version": "v1"
}
] | 2012-07-04 | [
[
"Magueijo",
"Joao",
""
],
[
"Bethke",
"Laura",
""
]
] | In this paper we conjecture the existence of a new "ground" state in quantum gravity, supplying a wave function for the inflationary Universe. We present its explicit perturbative expression in the connection representation, exhibiting the associated inner product. The state is chiral, dependent on the Immirzi paramete... |
1303.4575 | Marc Mars | Marc Mars | Constraint equations for general hypersurfaces and applications to
shells | 34 pages, no figures | null | 10.1007/s10714-013-1579-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hypersurfaces of arbitrary causal character embedded in a spacetime are
studied with the aim of extracting necessary and sufficient free data on the
submanifold suitable for reconstructing the spacetime metric and its first
derivative along the hypersurface. The constraint equations for hypersurfaces
of arbitrary cau... | [
{
"created": "Tue, 19 Mar 2013 13:00:23 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Mars",
"Marc",
""
]
] | Hypersurfaces of arbitrary causal character embedded in a spacetime are studied with the aim of extracting necessary and sufficient free data on the submanifold suitable for reconstructing the spacetime metric and its first derivative along the hypersurface. The constraint equations for hypersurfaces of arbitrary causa... |
0910.2425 | Etera R. Livine | Maite Dupuis, Etera R. Livine | The 6j-symbol: Recursion, Correlations and Asymptotics | 11 pages | Class.Quant.Grav.27:135003,2010 | 10.1088/0264-9381/27/13/135003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the asymptotic expansion of the 6j-symbol using the Schulten-Gordon
recursion relations. We focus on the particular case of the isosceles
tetrahedron and we provide explicit formulas for up to the third order
corrections beyond the leading order. Moreover, in the framework of spinfoam
models for 3d quantum g... | [
{
"created": "Tue, 13 Oct 2009 15:52:38 GMT",
"version": "v1"
}
] | 2010-05-25 | [
[
"Dupuis",
"Maite",
""
],
[
"Livine",
"Etera R.",
""
]
] | We study the asymptotic expansion of the 6j-symbol using the Schulten-Gordon recursion relations. We focus on the particular case of the isosceles tetrahedron and we provide explicit formulas for up to the third order corrections beyond the leading order. Moreover, in the framework of spinfoam models for 3d quantum gra... |
2103.15984 | Ben Whale | Susan M Scott and Ben E Whale | The Endpoint Theorem | In memoriam of Chris J S Clarke. 12 pages, 1 figure. PACS: 04.20.Dw.
Appeared in CQG:
https://iopscience.iop.org/article/10.1088/1361-6382/abe1fe/meta | Class. Quantum Grav. 38 065012 (2021) | 10.1088/1361-6382/abe1fe | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The Endpoint Theorem links the existence of a sequence (curve), without
accumulation points, in a manifold to the existence of an open embedding of
that manifold so that the image of the given sequence (curve) has a unique
endpoint. It plays a fundamental role in the theory of the Abstract Boundary as
it implies that... | [
{
"created": "Mon, 29 Mar 2021 22:56:14 GMT",
"version": "v1"
}
] | 2021-03-31 | [
[
"Scott",
"Susan M",
""
],
[
"Whale",
"Ben E",
""
]
] | The Endpoint Theorem links the existence of a sequence (curve), without accumulation points, in a manifold to the existence of an open embedding of that manifold so that the image of the given sequence (curve) has a unique endpoint. It plays a fundamental role in the theory of the Abstract Boundary as it implies that t... |
gr-qc/0411108 | Eric Poisson | Roland Haas and Eric Poisson | Mass change and motion of a scalar charge in cosmological spacetimes | 9 pages, 2 figures, revtex4 | Class.Quant.Grav. 22 (2005) S739-S752 | 10.1088/0264-9381/22/15/008 | null | gr-qc | null | Continuing previous work reported in an earlier paper [L.M. Burko, A.I.
Harte, and E. Poisson, Phys. Rev. D 65, 124006 (2002)] we calculate the
self-force acting on a point scalar charge in a wide class of cosmological
spacetimes. The self-force produces two types of effect. The first is a
time-changing inertial mass... | [
{
"created": "Mon, 22 Nov 2004 21:58:33 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Haas",
"Roland",
""
],
[
"Poisson",
"Eric",
""
]
] | Continuing previous work reported in an earlier paper [L.M. Burko, A.I. Harte, and E. Poisson, Phys. Rev. D 65, 124006 (2002)] we calculate the self-force acting on a point scalar charge in a wide class of cosmological spacetimes. The self-force produces two types of effect. The first is a time-changing inertial mass, ... |
gr-qc/9801092 | Bruce Bassett | G. F. R. Ellis, B. A. Bassett and P. K. Dunsby | Lensing and caustic effects on cosmological distances | 28 pages, 6 ps figures, epsf | Class.Quant.Grav. 15 (1998) 2345-2361 | 10.1088/0264-9381/15/8/015 | null | gr-qc astro-ph | null | We consider the changes which occur in cosmological distances due to the
combined effects of some null geodesics passing through low-density regions
while others pass through lensing-induced caustics. This combination of effects
increases observed areas corresponding to a given solid angle even when
averaged over lar... | [
{
"created": "Wed, 28 Jan 1998 15:55:25 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Ellis",
"G. F. R.",
""
],
[
"Bassett",
"B. A.",
""
],
[
"Dunsby",
"P. K.",
""
]
] | We consider the changes which occur in cosmological distances due to the combined effects of some null geodesics passing through low-density regions while others pass through lensing-induced caustics. This combination of effects increases observed areas corresponding to a given solid angle even when averaged over large... |
1309.3856 | Luca Fabbri | Salvatore Capozziello, Luca Fabbri, Stefano Vignolo | Weak Forces and Neutrino Oscillations under the standards of Hybrid
Gravity with Torsion | 13 pages | Mod.Phys.Lett.A28:1350155,2013 | 10.1142/S0217732313501551 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a unifying approach where weak forces and neutrino oscillations
are interpreted under the same standards of torsional hybrid gravity. This
gravitational theory mixes metric and metric-affine formalism in presence of
torsion and allows to derive an effective scalar field which gives rise to a
running coupli... | [
{
"created": "Mon, 16 Sep 2013 08:49:05 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Oct 2013 14:20:50 GMT",
"version": "v2"
},
{
"created": "Wed, 6 Nov 2013 12:13:17 GMT",
"version": "v3"
}
] | 2013-11-07 | [
[
"Capozziello",
"Salvatore",
""
],
[
"Fabbri",
"Luca",
""
],
[
"Vignolo",
"Stefano",
""
]
] | We present a unifying approach where weak forces and neutrino oscillations are interpreted under the same standards of torsional hybrid gravity. This gravitational theory mixes metric and metric-affine formalism in presence of torsion and allows to derive an effective scalar field which gives rise to a running coupling... |
2404.01376 | Pablo Antonio Cano Molina-Ni\~nirola | Pablo A. Cano | Inconsistency of modified gravity in cosmology | 6 pages; v2: references added, version sent to the journal | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that there is a fundamental flaw in the application of modified
gravity theories in cosmology, taking $f(R)$ gravity as a paradigmatic example.
This theory contains a scalar degree of freedom that couples to the matter
stress-energy tensor but not to gravitational energy. However, when applied to
cosmology th... | [
{
"created": "Mon, 1 Apr 2024 18:00:01 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Apr 2024 12:49:07 GMT",
"version": "v2"
}
] | 2024-04-09 | [
[
"Cano",
"Pablo A.",
""
]
] | We show that there is a fundamental flaw in the application of modified gravity theories in cosmology, taking $f(R)$ gravity as a paradigmatic example. This theory contains a scalar degree of freedom that couples to the matter stress-energy tensor but not to gravitational energy. However, when applied to cosmology this... |
2212.12484 | Patrick Peter | Jaime de Cabo Martin, Przemys{\l}aw Ma{\l}kiewicz and Patrick Peter | Ambiguous power spectrum from a quantum bounce | 16 pages, 7 figures, follow-up article to gr-qc 2111.02963, matching
published version | Phys.Rev.D 109 (2024) 6, 066009 | 10.1103/PhysRevD.109.066009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A quantum cosmological bouncing model may exhibit an ambiguity stemming from
the nonclassical nature of the background evolution: two classically equivalent
theories can produce two qualitatively different potentials sourcing the
perturbations. We derive explicitly the quantum canonical transformation
involving the q... | [
{
"created": "Fri, 23 Dec 2022 17:24:46 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Oct 2023 18:16:05 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Mar 2024 21:03:35 GMT",
"version": "v3"
}
] | 2024-03-25 | [
[
"Martin",
"Jaime de Cabo",
""
],
[
"Małkiewicz",
"Przemysław",
""
],
[
"Peter",
"Patrick",
""
]
] | A quantum cosmological bouncing model may exhibit an ambiguity stemming from the nonclassical nature of the background evolution: two classically equivalent theories can produce two qualitatively different potentials sourcing the perturbations. We derive explicitly the quantum canonical transformation involving the qua... |
1308.5674 | Mohammad Reza Setare | M. R. Setare and V. Kamali | Warm Gauge-Flation | 15 pages, 4 figures | null | 10.1007/s10714-013-1642-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Non-abelian gauge field inflation is studied in the context of warm inflation
scenario. We introduce this scenario as a mechanism that gives an end for
gauge-flation model. Slow-roll parameters and perturbation parameters are
presented for this model. We find the general conditions which are required for
this model t... | [
{
"created": "Mon, 26 Aug 2013 06:57:09 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Setare",
"M. R.",
""
],
[
"Kamali",
"V.",
""
]
] | Non-abelian gauge field inflation is studied in the context of warm inflation scenario. We introduce this scenario as a mechanism that gives an end for gauge-flation model. Slow-roll parameters and perturbation parameters are presented for this model. We find the general conditions which are required for this model to ... |
1805.00295 | Theophanes Grammenos | Susmita Sarkar, Farook Rahaman, Irina Radinschi, Theophanes Grammenos
and Joydeep Chakraborty | Particle motion around charged black holes in generalized dilaton-axion
gravity | 11 pages, 5 figures, references added, figure 3 replaced, typos
corrected | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The behaviour of massive and massless test particles around asymptotically
flat and spherically symmetric, charged black holes in the context of
generalized dilaton-axion gravity in four dimensions is studied. All the
possible motions are investigated by calculating and plotting the corresponding
effective potential ... | [
{
"created": "Sat, 28 Apr 2018 14:53:59 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Sep 2018 17:32:39 GMT",
"version": "v2"
}
] | 2018-09-12 | [
[
"Sarkar",
"Susmita",
""
],
[
"Rahaman",
"Farook",
""
],
[
"Radinschi",
"Irina",
""
],
[
"Grammenos",
"Theophanes",
""
],
[
"Chakraborty",
"Joydeep",
""
]
] | The behaviour of massive and massless test particles around asymptotically flat and spherically symmetric, charged black holes in the context of generalized dilaton-axion gravity in four dimensions is studied. All the possible motions are investigated by calculating and plotting the corresponding effective potential fo... |
gr-qc/0412115 | Manuel Tiglio | Olivier Sarbach and Manuel Tiglio | Boundary conditions for Einstein's field equations: Analytical and
numerical analysis | 31 pages, updated version, to appear in Journal of Hyperbolic
Differential Equations | J.Hyperbol.Diff.Equat. 2 (2005) 839 | null | null | gr-qc | null | Outer boundary conditions for strongly and symmetric hyperbolic formulations
of 3D Einstein's field equations with a live gauge condition are discussed. The
boundary conditions have the property that they ensure constraint propagation
and control in a sense made precise in this article the physical degrees of
freedom... | [
{
"created": "Wed, 22 Dec 2004 19:08:11 GMT",
"version": "v1"
},
{
"created": "Sat, 11 Jun 2005 01:29:11 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Sarbach",
"Olivier",
""
],
[
"Tiglio",
"Manuel",
""
]
] | Outer boundary conditions for strongly and symmetric hyperbolic formulations of 3D Einstein's field equations with a live gauge condition are discussed. The boundary conditions have the property that they ensure constraint propagation and control in a sense made precise in this article the physical degrees of freedom a... |
gr-qc/9804068 | Friedrich W. Hehl | Jose Socorro, Alfredo Macias, Friedrich W. Hehl | Computer algebra in gravity: Programs for (non-)Riemannian spacetimes. I | 28 pages, latex-file | Comput.Phys.Commun. 115 (1998) 264-283 | 10.1016/S0010-4655(98)00133-7 | Cologne-Thp-1998-he12 | gr-qc | null | Computer algebra programs are presented for application in general
relativity, in electrodynamics, and in gauge theories of gravity. The
mathematical formalism used is the calculus of exterior differential forms, the
computer algebra system applied Hearn's Reduce with Schruefer's exterior form
package Excalc. As a no... | [
{
"created": "Fri, 24 Apr 1998 15:08:32 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Socorro",
"Jose",
""
],
[
"Macias",
"Alfredo",
""
],
[
"Hehl",
"Friedrich W.",
""
]
] | Computer algebra programs are presented for application in general relativity, in electrodynamics, and in gauge theories of gravity. The mathematical formalism used is the calculus of exterior differential forms, the computer algebra system applied Hearn's Reduce with Schruefer's exterior form package Excalc. As a non-... |
1207.1009 | Kazuharu Bamba | Kazuharu Bamba, Antonio Lopez-Revelles, R. Myrzakulov, S. D. Odintsov
and L. Sebastiani | Cosmic history of viable exponential gravity: Equation of state
oscillations and growth index from inflation to dark energy era | 35 pages, 23 figures, version accepted for publication in Classical
and Quantum Gravity | Class. Quantum Grav. 30 (2013) 015008 | 10.1088/0264-9381/30/1/015008 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A generic feature of viable $F(R)$ gravity is investigated: It is
demonstrated that during the matter dominated era the large frequency
oscillations of the effective dark energy may influence the behavior of higher
derivatives of the Hubble parameter with the risk to produce some singular
unphysical solutions at high... | [
{
"created": "Tue, 3 Jul 2012 12:04:26 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Nov 2012 04:45:01 GMT",
"version": "v2"
}
] | 2012-12-14 | [
[
"Bamba",
"Kazuharu",
""
],
[
"Lopez-Revelles",
"Antonio",
""
],
[
"Myrzakulov",
"R.",
""
],
[
"Odintsov",
"S. D.",
""
],
[
"Sebastiani",
"L.",
""
]
] | A generic feature of viable $F(R)$ gravity is investigated: It is demonstrated that during the matter dominated era the large frequency oscillations of the effective dark energy may influence the behavior of higher derivatives of the Hubble parameter with the risk to produce some singular unphysical solutions at high r... |
1303.1535 | Krishnamohan Parattu | Krishnamohan Parattu, Bibhas Ranjan Majhi and T. Padmanabhan | The Structure of the Gravitational Action and its relation with Horizon
Thermodynamics and Emergent Gravity Paradigm | 31 pages, published version with typos fixed | Phys.Rev. D87 (2013) 124011 | 10.1103/PhysRevD.87.124011 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/3.0/ | If gravity is an emergent phenomenon, as suggested by several recent results,
then the structure of the action principle for gravity should encode this fact.
With this motivation we study several features of the Einstein-Hilbert action
and establish direct connections with horizon thermodynamics. We begin by
introduc... | [
{
"created": "Wed, 6 Mar 2013 21:00:08 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Dec 2013 17:38:27 GMT",
"version": "v2"
}
] | 2013-12-04 | [
[
"Parattu",
"Krishnamohan",
""
],
[
"Majhi",
"Bibhas Ranjan",
""
],
[
"Padmanabhan",
"T.",
""
]
] | If gravity is an emergent phenomenon, as suggested by several recent results, then the structure of the action principle for gravity should encode this fact. With this motivation we study several features of the Einstein-Hilbert action and establish direct connections with horizon thermodynamics. We begin by introducin... |
1003.5890 | Joseph Henson | Joe Henson | Discovering the Discrete Universe | 24 pages, 4 figures. Based on a proceedings article for the
"Foundations of Space and Time" conference, Cape Town, August 2009, in honour
of George Ellis' 70th birthday. | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper presents an brief review of some recent work on the causal set
approach to quantum gravity. Causal sets are a discretisation of spacetime that
allow the symmetries of GR to be preserved in the continuum approximation. One
proposed application of causal sets is to use them as the histories in a
quantum sum-... | [
{
"created": "Tue, 30 Mar 2010 18:33:33 GMT",
"version": "v1"
}
] | 2010-03-31 | [
[
"Henson",
"Joe",
""
]
] | This paper presents an brief review of some recent work on the causal set approach to quantum gravity. Causal sets are a discretisation of spacetime that allow the symmetries of GR to be preserved in the continuum approximation. One proposed application of causal sets is to use them as the histories in a quantum sum-ov... |
1304.4777 | Giulio D'Odorico | Alessandro Codello, Giulio D'Odorico and Carlo Pagani | Consistent closure of renormalization group flow equations in quantum
gravity | 5 pages, 2 figures; v2: matches version published in PRD | Phys.Rev. D89 (2014) 8, 081701 | 10.1103/PhysRevD.89.081701 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a consistent closure for the beta functions of the cosmological
and Newton's constants by evaluating the influence of the fluctuating metric
and ghost fields anomalous dimensions on their flow. In this generalized
framework we confirm the presence of a UV attractive non-Gaussian fixed-point.
Our closure ... | [
{
"created": "Wed, 17 Apr 2013 11:53:24 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Jun 2014 22:10:36 GMT",
"version": "v2"
}
] | 2015-03-18 | [
[
"Codello",
"Alessandro",
""
],
[
"D'Odorico",
"Giulio",
""
],
[
"Pagani",
"Carlo",
""
]
] | We construct a consistent closure for the beta functions of the cosmological and Newton's constants by evaluating the influence of the fluctuating metric and ghost fields anomalous dimensions on their flow. In this generalized framework we confirm the presence of a UV attractive non-Gaussian fixed-point. Our closure me... |
gr-qc/0212072 | Roustam Zalaletdinov | Roustam Zalaletdinov, Alan Coley | Averaging out Inhomogeneous Newtonian Cosmologies: III. The Averaged
Navier-Stokes-Poisson Equations | 42 pages, LaTeX | null | null | null | gr-qc physics.flu-dyn | null | The basic concepts and hypotheses of Newtonian Cosmology necessary for a
consistent treatment of the averaged cosmological dynamics are formulated and
discussed in details. The space-time, space, time and ensemble averages for the
cosmological fluid fields are defined and analyzed with a special attention
paid to the... | [
{
"created": "Tue, 17 Dec 2002 08:45:45 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Dec 2002 03:09:03 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Zalaletdinov",
"Roustam",
""
],
[
"Coley",
"Alan",
""
]
] | The basic concepts and hypotheses of Newtonian Cosmology necessary for a consistent treatment of the averaged cosmological dynamics are formulated and discussed in details. The space-time, space, time and ensemble averages for the cosmological fluid fields are defined and analyzed with a special attention paid to their... |
0911.1977 | Andrei Bratchikov | A.V.Bratchikov | Solving the Einstein field equations | 6 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A solution of the Einstein vacuum field equations is constructed within the
contex of perturbation theory. The solution possesses a graphical
representation in terms of diagrams.
| [
{
"created": "Tue, 10 Nov 2009 19:56:11 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Nov 2009 15:57:27 GMT",
"version": "v2"
}
] | 2009-11-15 | [
[
"Bratchikov",
"A. V.",
""
]
] | A solution of the Einstein vacuum field equations is constructed within the contex of perturbation theory. The solution possesses a graphical representation in terms of diagrams. |
1810.08085 | Adri\'an Del R\'io Vega | Ivan Agullo, Adrian del Rio, and Jose Navarro-Salas | Classical and quantum aspects of electric-magnetic duality rotations in
curved spacetimes | null | Phys. Rev. D 98, 125001 (2018) | 10.1103/PhysRevD.98.125001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that the source-free Maxwell equations are invariant under
electric-magnetic duality rotations, F --> F cos {\theta} + *F sin {\theta}.
These transformations are indeed a symmetry of the theory in Noether sense. The
associated constant of motion is the difference in the intensity between self-
and an... | [
{
"created": "Thu, 18 Oct 2018 14:38:09 GMT",
"version": "v1"
}
] | 2018-12-12 | [
[
"Agullo",
"Ivan",
""
],
[
"del Rio",
"Adrian",
""
],
[
"Navarro-Salas",
"Jose",
""
]
] | It is well known that the source-free Maxwell equations are invariant under electric-magnetic duality rotations, F --> F cos {\theta} + *F sin {\theta}. These transformations are indeed a symmetry of the theory in Noether sense. The associated constant of motion is the difference in the intensity between self- and anti... |
2401.13997 | Hai-Tian Wang | Hai-Tian Wang and Lijing Shao | Comparison between time-domain and frequency-domain Bayesian inferences
to inspiral-merger-ringdown gravitational-wave signals | 9 pages, 3 figures; accepted by PRD | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Time-domain (TD) Bayesian inference is important in ringdown analysis for
gravitational wave (GW) astronomy. The validity of this method has been well
studied by Isi and Farr [1]. Using GW190521 as an example, we study the TD
method in detail by comparing it with the frequency-domain (FD) method as a
complement to pr... | [
{
"created": "Thu, 25 Jan 2024 07:49:00 GMT",
"version": "v1"
}
] | 2024-01-26 | [
[
"Wang",
"Hai-Tian",
""
],
[
"Shao",
"Lijing",
""
]
] | Time-domain (TD) Bayesian inference is important in ringdown analysis for gravitational wave (GW) astronomy. The validity of this method has been well studied by Isi and Farr [1]. Using GW190521 as an example, we study the TD method in detail by comparing it with the frequency-domain (FD) method as a complement to prev... |
1805.08459 | Peter Stichel | P.C. Stichel | Analytical solutions for two inhomogeneous cosmological models with
energy flow and dynamical curvature | 17 pages, enlarged version, accepted by Phys. Rev. D | Phys. Rev. D 98, 104022 (2018) | 10.1103/PhysRevD.98.104022 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently we have introduced a nonrelativistic cosmological model (NRCM)
exhibiting a dynamical spatial curvature. For this model the present day cosmic
acceleration is not attributed to a negative pressure (dark energy) but it is
driven by a nontrivial energy flow leading to a negative spatial curvature. In
this pape... | [
{
"created": "Tue, 22 May 2018 08:56:53 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Nov 2018 11:23:53 GMT",
"version": "v2"
}
] | 2018-11-21 | [
[
"Stichel",
"P. C.",
""
]
] | Recently we have introduced a nonrelativistic cosmological model (NRCM) exhibiting a dynamical spatial curvature. For this model the present day cosmic acceleration is not attributed to a negative pressure (dark energy) but it is driven by a nontrivial energy flow leading to a negative spatial curvature. In this paper ... |
gr-qc/0005016 | Takashi Tamaki | Hiroki Yajima, Takashi Tamaki | Black hole solutions in Euler-Heisenberg theory | 8 pages, 13 figures, figures corrected and some comments added | Phys.Rev. D63 (2001) 064007 | 10.1103/PhysRevD.63.064007 | null | gr-qc hep-th | null | We construct static and spherically symmetric black hole solutions in the
Einstein-Euler-Heisenberg (EEH) system which is considered as an effective
action of a superstring theory. We considered electrically charged,
magnetically charged and dyon solutions. We can solve analytically for the
magnetically charged case.... | [
{
"created": "Thu, 4 May 2000 08:38:02 GMT",
"version": "v1"
},
{
"created": "Fri, 12 May 2000 09:05:05 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Yajima",
"Hiroki",
""
],
[
"Tamaki",
"Takashi",
""
]
] | We construct static and spherically symmetric black hole solutions in the Einstein-Euler-Heisenberg (EEH) system which is considered as an effective action of a superstring theory. We considered electrically charged, magnetically charged and dyon solutions. We can solve analytically for the magnetically charged case. W... |
gr-qc/9807074 | Luca Lusanna. Sez. Di Firenze. | Luca Lusanna (INFN, Firenze) and Stefano Russo (Lugano) | Tetrad Gravity: II) Dirac's Observables | 101 pages, revtex, revised version with revised interpretational
aspects | null | null | null | gr-qc | null | After a study of the Hamiltonian group of gauge transformations of canonical
tetrad gravity on globally hyperbolic, asymptotically flat at spatial infinity,
spacetimes with Cauchy hypersurfaces $\Sigma_{\tau}$ diffeomorphic to $R^3, we
find the dependence of the cotriads on $\Sigma_{\tau}$ and of their momenta on
the... | [
{
"created": "Tue, 28 Jul 1998 15:16:04 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Jan 1999 16:50:22 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Jul 1999 12:21:36 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Lusanna",
"Luca",
"",
"INFN, Firenze"
],
[
"Russo",
"Stefano",
"",
"Lugano"
]
] | After a study of the Hamiltonian group of gauge transformations of canonical tetrad gravity on globally hyperbolic, asymptotically flat at spatial infinity, spacetimes with Cauchy hypersurfaces $\Sigma_{\tau}$ diffeomorphic to $R^3, we find the dependence of the cotriads on $\Sigma_{\tau}$ and of their momenta on the s... |
1305.5629 | Muhammad Azam | M. Sharif and M. Azam | Stability of Anisotropic Cylinder with Zero Expansion | 16 pages, no figure | Mon. Not. R. Astron. Soc. 430(2013)3048 | 10.1093/mnras/stt112 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the dynamical instability of anisotropic collapsing cylinder with
the expansion-free condition, which generates vacuum cavity within fluid
distribution. The perturbation scheme is applied to distinguish Newtonian,
post-Newtonian and post-post Newtonian terms, which are used for constructing
dynamical equatio... | [
{
"created": "Fri, 24 May 2013 06:34:12 GMT",
"version": "v1"
}
] | 2015-06-16 | [
[
"Sharif",
"M.",
""
],
[
"Azam",
"M.",
""
]
] | We study the dynamical instability of anisotropic collapsing cylinder with the expansion-free condition, which generates vacuum cavity within fluid distribution. The perturbation scheme is applied to distinguish Newtonian, post-Newtonian and post-post Newtonian terms, which are used for constructing dynamical equation ... |
gr-qc/9810073 | Roberto Casadio | Roberto Casadio | Quantum gravitational fluctuations and the semi-classical limit | LaTeX, 15 pages, no figures | Int.J.Mod.Phys.D9:511-529,2000 | 10.1142/S0218271800000517 | null | gr-qc astro-ph hep-th | null | An attempt is made to go beyond the standard semi-classical approximation for
gravity in the Born-Oppenheimer decomposition of the wave-function in
minisuperspace. New terms are included which correspond to quantum
gravitational fluctuations on the background metric. Their existence renders
the definition of the semi... | [
{
"created": "Thu, 22 Oct 1998 08:08:56 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Feb 1999 10:04:05 GMT",
"version": "v2"
},
{
"created": "Mon, 10 Apr 2000 19:43:18 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Casadio",
"Roberto",
""
]
] | An attempt is made to go beyond the standard semi-classical approximation for gravity in the Born-Oppenheimer decomposition of the wave-function in minisuperspace. New terms are included which correspond to quantum gravitational fluctuations on the background metric. Their existence renders the definition of the semi-c... |
gr-qc/0510076 | Nicolas Yunes | Nicolas Yunes and Jose Gonzalez | Metric of a tidally perturbed spinning black hole | 17 pages, 3 figures. Final PRD version, minor typos, etc corrected.
v3: corrected typo in Eq. (35) and (57) | Phys.Rev. D73 (2006) 024010 | 10.1103/PhysRevD.73.024010 | IGPG-05/11-3 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explicitly construct the metric of a Kerr black hole that is tidally
perturbed by the external universe in the slow-motion approximation. This
approximation assumes that the external universe changes slowly relative to the
rotation rate of the hole, thus allowing the parameterization of the
Newman-Penrose scalar $... | [
{
"created": "Sun, 16 Oct 2005 19:25:35 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jan 2006 18:25:07 GMT",
"version": "v2"
},
{
"created": "Thu, 10 Apr 2014 20:15:01 GMT",
"version": "v3"
}
] | 2014-04-14 | [
[
"Yunes",
"Nicolas",
""
],
[
"Gonzalez",
"Jose",
""
]
] | We explicitly construct the metric of a Kerr black hole that is tidally perturbed by the external universe in the slow-motion approximation. This approximation assumes that the external universe changes slowly relative to the rotation rate of the hole, thus allowing the parameterization of the Newman-Penrose scalar $\p... |
gr-qc/0404042 | Valery Kiselev | V.V.Kiselev | Vector field and rotational curves in dark galactic halos | 17 pages, iopart style, misprint removed | Class.Quant.Grav.22:541-558,2005 | 10.1088/0264-9381/22/3/007 | null | gr-qc astro-ph hep-ph | null | We study equations of a non-gauge vector field in a spherically symmetric
static metric. The constant vector field with a scale arrangement of
components: the time component about the Planck mass m_{Pl} and the radial
component about M suppressed with respect to the Planck mass, serves as a
source of metric reproduci... | [
{
"created": "Fri, 9 Apr 2004 12:08:49 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Apr 2004 11:40:39 GMT",
"version": "v2"
},
{
"created": "Mon, 17 May 2004 06:59:39 GMT",
"version": "v3"
}
] | 2010-11-19 | [
[
"Kiselev",
"V. V.",
""
]
] | We study equations of a non-gauge vector field in a spherically symmetric static metric. The constant vector field with a scale arrangement of components: the time component about the Planck mass m_{Pl} and the radial component about M suppressed with respect to the Planck mass, serves as a source of metric reproducing... |
2003.08102 | Deyou Chen | Deyou Chen, Shan Zeng | Overcharging problem and thermodynamics in extended phase spaces | 16 pages | Nuclear Physics B 957 (2020) 115089 | 10.1016/j.nuclphysb.2020.115089 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper, the overcharging problem and thermodynamics in the extended
phase spaces of the five-dimensional spherically symmetric topological black
holes are investigated by absorptions of scalar particles and fermions. The
cosmological constant is regarded as a variable related to pressure and its
conjugate quan... | [
{
"created": "Wed, 18 Mar 2020 09:06:25 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Jun 2020 02:14:23 GMT",
"version": "v2"
}
] | 2020-07-15 | [
[
"Chen",
"Deyou",
""
],
[
"Zeng",
"Shan",
""
]
] | In this paper, the overcharging problem and thermodynamics in the extended phase spaces of the five-dimensional spherically symmetric topological black holes are investigated by absorptions of scalar particles and fermions. The cosmological constant is regarded as a variable related to pressure and its conjugate quanti... |
1711.03964 | Nicola Rendell | Atsushi Higuchi, Nicola Rendell | Infrared divergences for free quantum fields in cosmological spacetimes | 21 pages, no figures | Class.Quant.Grav. 35 115004 (2018) | 10.1088/1361-6382/aabcb4 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the nature of infrared divergences for the free graviton and
inflaton two-point functions in flat Friedman-Lema\^{\i}tre-Robertson-Walker
spacetime. These divergences arise because the momentum integral for these
two-point functions diverges in the infrared. It is straightforward to see that
the power ... | [
{
"created": "Tue, 7 Nov 2017 19:00:02 GMT",
"version": "v1"
},
{
"created": "Thu, 3 May 2018 11:06:36 GMT",
"version": "v2"
}
] | 2018-05-04 | [
[
"Higuchi",
"Atsushi",
""
],
[
"Rendell",
"Nicola",
""
]
] | We investigate the nature of infrared divergences for the free graviton and inflaton two-point functions in flat Friedman-Lema\^{\i}tre-Robertson-Walker spacetime. These divergences arise because the momentum integral for these two-point functions diverges in the infrared. It is straightforward to see that the power of... |
gr-qc/9907079 | Pilar Infante | M. P. Infante (1 and 2), N. Sanchez (1) ((1) Obs. Paris-DEMIRM, (2)
DFTUZ-Univ. Zaragoza) | Linking a Minimal Theoretical Model of Scale Factor Evolution with
Observational Universe Information | LaTeX, 29 pages with 1 figure. Uses epsfig and psfrag | null | null | DFTUZ/99/12 | gr-qc astro-ph hep-ph hep-th | null | We study several approaches for constructing a minimal model of Universe
evolution by matching different stages of scale factor laws. We discuss the
continuity in the transitions among the stages and the time variables involved.
We develop a way to modelize these transitions without loss of observational
predictabili... | [
{
"created": "Sun, 25 Jul 1999 17:00:18 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Infante",
"M. P.",
"",
"1 and 2"
],
[
"Sanchez",
"N.",
""
]
] | We study several approaches for constructing a minimal model of Universe evolution by matching different stages of scale factor laws. We discuss the continuity in the transitions among the stages and the time variables involved. We develop a way to modelize these transitions without loss of observational predictability... |
1309.6358 | Ramon Torres | R. Torres, F. Fayos and O. Lorente-Espin | The mechanism why colliders could create quasi-stable black holes | 16 pages, 3 figures | Int. J. Mod. Phys. D V.22 p.1350086 (2013) | 10.1142/S0218271813500867 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been postulated that black holes could be created in particle
collisions within the range of the available energies for nowadays colliders
(LHC). In this paper we analyze the evaporation of a type of black holes that
are candidates for this specific behaviour, namely, small black holes on a
brane in a world wi... | [
{
"created": "Tue, 24 Sep 2013 22:10:40 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Torres",
"R.",
""
],
[
"Fayos",
"F.",
""
],
[
"Lorente-Espin",
"O.",
""
]
] | It has been postulated that black holes could be created in particle collisions within the range of the available energies for nowadays colliders (LHC). In this paper we analyze the evaporation of a type of black holes that are candidates for this specific behaviour, namely, small black holes on a brane in a world with... |
2010.01442 | P. A. Gonzalez | P. A. Gonz\'alez, Marco Olivares, Yerko V\'asquez, J.R. Villanueva | Null geodesics in five-dimensional Reissner-Nordstr\"om anti-de Sitter
black hole | Version accepted for publication by EPJC | null | 10.1140/epjc/s10052-021-09024-9 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The study of the motion of photons around massive bodies is one of the most
useful tools to know the geodesic structure associated with said gravitational
source. In the present work, different possible paths projected in an invariant
hyperplane are investigated, considering five-dimensional Reissner-Nordstr\"om
anti... | [
{
"created": "Sat, 3 Oct 2020 23:26:00 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Mar 2021 13:59:26 GMT",
"version": "v2"
}
] | 2021-03-31 | [
[
"González",
"P. A.",
""
],
[
"Olivares",
"Marco",
""
],
[
"Vásquez",
"Yerko",
""
],
[
"Villanueva",
"J. R.",
""
]
] | The study of the motion of photons around massive bodies is one of the most useful tools to know the geodesic structure associated with said gravitational source. In the present work, different possible paths projected in an invariant hyperplane are investigated, considering five-dimensional Reissner-Nordstr\"om anti-d... |
gr-qc/0208076 | Rodolfo Mohamed Id Betan | Mario Castagnino, Gabriel Catren and Rafael Ferraro | Time asymmetries in quantum cosmology and the searching for boundary
conditions to the Wheeler-DeWitt equation | 25 pages, 1 figure | Class.Quant.Grav. 19 (2002) 4729-4746 | 10.1088/0264-9381/19/18/308 | null | gr-qc | null | The paper addresses the quantization of minisuperspace cosmological models by
studying a possible solution to the problem of time and time asymmetries in
quantum cosmology. Since General Relativity does not have a privileged time
variable of the newtonian type, it is necessary, in order to have a dynamical
evolution,... | [
{
"created": "Mon, 26 Aug 2002 12:27:51 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Castagnino",
"Mario",
""
],
[
"Catren",
"Gabriel",
""
],
[
"Ferraro",
"Rafael",
""
]
] | The paper addresses the quantization of minisuperspace cosmological models by studying a possible solution to the problem of time and time asymmetries in quantum cosmology. Since General Relativity does not have a privileged time variable of the newtonian type, it is necessary, in order to have a dynamical evolution, t... |
2107.07839 | Rodrigo Maier | Santiago Esteban Perez Bergliaffa, Rodrigo Maier, Nathan de Oliveira
Silvano | Hairy Black Holes from Horndeski Theory | Submitted to EPJC | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an exact static black hole solution of Einstein field equations in
the framework of Horndeski Theory by imposing spherical symmetry and choosing
the coupling constants in the Lagrangian so that the only singularity in the
solution is at $r=0$. The analytical extension is built in two particular
domains of ... | [
{
"created": "Fri, 16 Jul 2021 11:59:50 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Aug 2021 21:34:28 GMT",
"version": "v2"
}
] | 2021-08-12 | [
[
"Bergliaffa",
"Santiago Esteban Perez",
""
],
[
"Maier",
"Rodrigo",
""
],
[
"Silvano",
"Nathan de Oliveira",
""
]
] | We present an exact static black hole solution of Einstein field equations in the framework of Horndeski Theory by imposing spherical symmetry and choosing the coupling constants in the Lagrangian so that the only singularity in the solution is at $r=0$. The analytical extension is built in two particular domains of th... |
1612.02586 | Juho Lankinen | Juho Lankinen and Iiro Vilja | Gravitational Particle Creation in a Stiff Matter Dominated Universe | 6 pages, 4 figures | JCAP08(2017)025 | 10.1088/1475-7516/2017/08/025 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A scenario for gravitational particle creation in a stiff matter dominated
flat Friedmann-Robertson-Walker universe is presented. The primary creation of
scalar particles is calculated using quantum field theory in curved spacetime
and it is found to be strongly dependent on the scalar mass and the expansion
paramete... | [
{
"created": "Thu, 8 Dec 2016 10:24:14 GMT",
"version": "v1"
}
] | 2017-09-27 | [
[
"Lankinen",
"Juho",
""
],
[
"Vilja",
"Iiro",
""
]
] | A scenario for gravitational particle creation in a stiff matter dominated flat Friedmann-Robertson-Walker universe is presented. The primary creation of scalar particles is calculated using quantum field theory in curved spacetime and it is found to be strongly dependent on the scalar mass and the expansion parameter ... |
1001.4492 | Thomas B\"ackdahl | Thomas B\"ackdahl, Juan A. Valiente Kroon | Geometric Invariant Measuring the Deviation from Kerr Data | 4 pages, added lemma, changed references | Phys.Rev.Lett.104:231102,2010 | 10.1103/PhysRevLett.104.231102 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A geometrical invariant for regular asymptotically Euclidean data for the
vacuum Einstein field equations is constructed. This invariant vanishes if and
only if the data correspond to a slice of the Kerr black hole spacetime --thus,
it provides a measure of the non-Kerr-like behavior of generic data. In order
to proc... | [
{
"created": "Mon, 25 Jan 2010 17:26:59 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Jun 2010 19:37:14 GMT",
"version": "v2"
}
] | 2010-11-11 | [
[
"Bäckdahl",
"Thomas",
""
],
[
"Kroon",
"Juan A. Valiente",
""
]
] | A geometrical invariant for regular asymptotically Euclidean data for the vacuum Einstein field equations is constructed. This invariant vanishes if and only if the data correspond to a slice of the Kerr black hole spacetime --thus, it provides a measure of the non-Kerr-like behavior of generic data. In order to procee... |
1207.6624 | Keith Andrew | John Max Wilson and Keith Andrew | Finite Future Cosmological Singularity Times and Maximum Predictability
Times in a Nonlinear FRW-KG Scalar Cosmology | 14 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the relative time scales associated with finite future
cosmological singularities, especially those classified as Big Rip cosmologies,
and the maximum predictability time of a coupled FRW-KG scalar cosmology with
chaotic regimes. Our approach is to show that by starting with a FRW-KG scalar
cosmology w... | [
{
"created": "Fri, 27 Jul 2012 19:38:00 GMT",
"version": "v1"
}
] | 2012-07-30 | [
[
"Wilson",
"John Max",
""
],
[
"Andrew",
"Keith",
""
]
] | We investigate the relative time scales associated with finite future cosmological singularities, especially those classified as Big Rip cosmologies, and the maximum predictability time of a coupled FRW-KG scalar cosmology with chaotic regimes. Our approach is to show that by starting with a FRW-KG scalar cosmology wit... |
2310.00462 | Ranjan Sharma | Satarupa Barman and Ranjan Sharma | Critical compactness bound of a class of compact stars | null | Gen. Relativ. Grav. 55:99 (2023) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Tolman VII solution [Phys. Rev. 55 (4), 364 (1939)] is an exact analytic
solution to the Einstein field equations describing the space-time of a static
spherically symmetric distribution of matter. The solution has been shown to be
capable of describing the interior of compact objects like neutron stars.
Generalized ... | [
{
"created": "Sat, 30 Sep 2023 18:50:51 GMT",
"version": "v1"
}
] | 2023-10-03 | [
[
"Barman",
"Satarupa",
""
],
[
"Sharma",
"Ranjan",
""
]
] | Tolman VII solution [Phys. Rev. 55 (4), 364 (1939)] is an exact analytic solution to the Einstein field equations describing the space-time of a static spherically symmetric distribution of matter. The solution has been shown to be capable of describing the interior of compact objects like neutron stars. Generalized [P... |
0906.4601 | Richard Obousy Dr. | R.K. Obousy and A.A. Saharian | Casimir energy and the possibility of higher dimensional manipulation | 18 pages, 6 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that the Casimir effect is an excellent candidate for the
stabilization of the extra dimensions. It has also been suggested that the
Casimir effect in higher dimensions may be the underlying phenomenon that is
responsible for the dark energy which is currently driving the accelerated
expansion of the... | [
{
"created": "Thu, 25 Jun 2009 06:59:44 GMT",
"version": "v1"
}
] | 2009-07-01 | [
[
"Obousy",
"R. K.",
""
],
[
"Saharian",
"A. A.",
""
]
] | It is well known that the Casimir effect is an excellent candidate for the stabilization of the extra dimensions. It has also been suggested that the Casimir effect in higher dimensions may be the underlying phenomenon that is responsible for the dark energy which is currently driving the accelerated expansion of the u... |
0809.3718 | Claudio Perini | Emanuele Alesci, Eugenio Bianchi, Elena Magliaro, Claudio Perini | Asymptotics of LQG fusion coefficients | 14 pages, minor changes | Class.Quant.Grav. 27 (2010) 095016 | 10.1088/0264-9381/27/9/095016 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The fusion coefficients from SO(3) to SO(4) play a key role in the definition
of spin foam models for the dynamics in Loop Quantum Gravity. In this paper we
give a simple analytic formula of the EPRL fusion coefficients. We study the
large spin asymptotics and show that they map SO(3) semiclassical intertwiners
into ... | [
{
"created": "Mon, 22 Sep 2008 17:08:01 GMT",
"version": "v1"
},
{
"created": "Sun, 5 Oct 2008 20:08:41 GMT",
"version": "v2"
}
] | 2013-04-30 | [
[
"Alesci",
"Emanuele",
""
],
[
"Bianchi",
"Eugenio",
""
],
[
"Magliaro",
"Elena",
""
],
[
"Perini",
"Claudio",
""
]
] | The fusion coefficients from SO(3) to SO(4) play a key role in the definition of spin foam models for the dynamics in Loop Quantum Gravity. In this paper we give a simple analytic formula of the EPRL fusion coefficients. We study the large spin asymptotics and show that they map SO(3) semiclassical intertwiners into $S... |
gr-qc/0002074 | Alan D. Rendall | H. Friedrich, A. D. Rendall | The Cauchy Problem for the Einstein Equations | 98 pages | Lect.Notes Phys.540:127-224,2000 | null | AEI-2000-012 | gr-qc | null | Various aspects of the Cauchy problem for the Einstein equations are
surveyed, with the emphasis on local solutions of the evolution equations.
Particular attention is payed to giving a clear explanation of conceptual
issues which arise in this context. The question of producing reduced systems
of equations which are... | [
{
"created": "Tue, 22 Feb 2000 13:03:54 GMT",
"version": "v1"
}
] | 2011-04-21 | [
[
"Friedrich",
"H.",
""
],
[
"Rendall",
"A. D.",
""
]
] | Various aspects of the Cauchy problem for the Einstein equations are surveyed, with the emphasis on local solutions of the evolution equations. Particular attention is payed to giving a clear explanation of conceptual issues which arise in this context. The question of producing reduced systems of equations which are h... |
1602.01705 | Alex Silbergleit Dr. | A.S. Silbergleit | Gravity and Cosmology with Interacting Dark Energy | null | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dark energy (DE) is not necessarily uniform when other sources of gravity are
present: interaction with matter leads to its variation in space and time. We
study cosmological implications of this fact by analyzing cosmological models
in which DE density interacts with matter and thus changes with time. We model
the D... | [
{
"created": "Wed, 3 Feb 2016 18:09:01 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Mar 2016 23:01:38 GMT",
"version": "v2"
}
] | 2016-03-23 | [
[
"Silbergleit",
"A. S.",
""
]
] | Dark energy (DE) is not necessarily uniform when other sources of gravity are present: interaction with matter leads to its variation in space and time. We study cosmological implications of this fact by analyzing cosmological models in which DE density interacts with matter and thus changes with time. We model the DE-... |
0809.3144 | Seyed Hamid Mehdipour | Kourosh Nozari and S. Hamid Mehdipour | Gravitational Uncertainty and Black Hole Remnants | 17 pages, 6 figures | Mod.Phys.Lett.A20:2937-2948,2005 | 10.1142/S0217732305018050 | null | gr-qc | http://creativecommons.org/licenses/by/3.0/ | Possible existence of black holes remnants provides a suitable candidates for
dark matter. In this paper we study the possibility of existence for such
remnants. We consider quantum gravitational induced corrections of black hole's
entropy and temperature to investigate the possibility of such relics.
Observational s... | [
{
"created": "Thu, 18 Sep 2008 16:15:52 GMT",
"version": "v1"
}
] | 2010-11-05 | [
[
"Nozari",
"Kourosh",
""
],
[
"Mehdipour",
"S. Hamid",
""
]
] | Possible existence of black holes remnants provides a suitable candidates for dark matter. In this paper we study the possibility of existence for such remnants. We consider quantum gravitational induced corrections of black hole's entropy and temperature to investigate the possibility of such relics. Observational sch... |
2202.06907 | Celia Escamilla-Rivera | Celia Escamilla-Rivera and Aldo Gamboa | A New Parameterized Interacting Holographic Dark Energy | 24 pages, 5 figures and an appendix with results tables. Accepted for
publication in The European Physical Journal Plus | The European Physical Journal Plus 2022 | 10.1140/epjp/s13360-022-02490-4 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study a cosmological model based on the holographic principle that allows
an interaction between dark energy and dark matter with a Hubble infrared
cutoff. We adopt an agnostic point of view with respect to the form of the
interaction between these dark components by using redshift parameterizations
of the dark en... | [
{
"created": "Mon, 14 Feb 2022 17:59:22 GMT",
"version": "v1"
}
] | 2022-02-22 | [
[
"Escamilla-Rivera",
"Celia",
""
],
[
"Gamboa",
"Aldo",
""
]
] | We study a cosmological model based on the holographic principle that allows an interaction between dark energy and dark matter with a Hubble infrared cutoff. We adopt an agnostic point of view with respect to the form of the interaction between these dark components by using redshift parameterizations of the dark ener... |
gr-qc/9605063 | Robert van den Hoogen | A.A. Coley, R.J. van den Hoogen (Dept. of Math, Stats, and Computing
Science, Dalhousie University) R. Maartens (School of Mathematical Studies,
University of Portsmouth) | Qualitative Viscous Cosmology | 13 pages, REVTeX, accepted for publication in Physical Review D | Phys.Rev. D54 (1996) 1393-1397 | 10.1103/PhysRevD.54.1393 | null | gr-qc | null | The Full (non--truncated) Israel--Stewart theory of bulk viscosity is applied
to dissipative FRW spacetimes. Dimensionless variables and dimensionless
equations of state are used to write the Einstein--thermodynamic equations as a
plane autonomous system and the qualitative behaviour of this system is
determined. Ent... | [
{
"created": "Tue, 28 May 1996 16:02:59 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Coley",
"A. A.",
"",
"Dept. of Math, Stats, and Computing\n Science, Dalhousie University"
],
[
"Hoogen",
"R. J. van den",
"",
"Dept. of Math, Stats, and Computing\n Science, Dalhousie University"
],
[
"Maartens",
"R.",
"",
"School of Mathematical Studies... | The Full (non--truncated) Israel--Stewart theory of bulk viscosity is applied to dissipative FRW spacetimes. Dimensionless variables and dimensionless equations of state are used to write the Einstein--thermodynamic equations as a plane autonomous system and the qualitative behaviour of this system is determined. Entro... |
2003.09548 | Sk Jahanur Hoque | P.T. Chru\'sciel, Sk Jahanur Hoque, Tomasz Smo{\l}ka | Energy of weak gravitational waves in spacetimes with a positive
cosmological constant | essentially identical to the version to appear in PRD | Phys. Rev. D 103, 064008 (2021) | 10.1103/PhysRevD.103.064008 | UWThPh-2020-12 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a formula for the total canonical energy, and its flux, of weak
gravitational waves on a de Sitter background.
| [
{
"created": "Sat, 21 Mar 2020 01:33:29 GMT",
"version": "v1"
},
{
"created": "Sat, 29 Aug 2020 23:51:48 GMT",
"version": "v2"
},
{
"created": "Sat, 30 Jan 2021 14:17:35 GMT",
"version": "v3"
}
] | 2021-03-10 | [
[
"Chruściel",
"P. T.",
""
],
[
"Hoque",
"Sk Jahanur",
""
],
[
"Smołka",
"Tomasz",
""
]
] | We derive a formula for the total canonical energy, and its flux, of weak gravitational waves on a de Sitter background. |
1710.00744 | Tao Wang | Li Li, Towe Wang | Membrane paradigm of the static black bottle | 9 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the membrane paradigm of black holes, it is usually assumed that the
normal vector of the stretched horizon has a vanishing acceleration. This
assumption breaks down for black bottles, a class of solutions discovered
recently in the asymptotically anti-de Sitter spacetime. In this paper, the
membrane paradigm is g... | [
{
"created": "Mon, 2 Oct 2017 15:59:56 GMT",
"version": "v1"
}
] | 2017-10-03 | [
[
"Li",
"Li",
""
],
[
"Wang",
"Towe",
""
]
] | In the membrane paradigm of black holes, it is usually assumed that the normal vector of the stretched horizon has a vanishing acceleration. This assumption breaks down for black bottles, a class of solutions discovered recently in the asymptotically anti-de Sitter spacetime. In this paper, the membrane paradigm is gen... |
2308.12913 | Liping Meng | Liping Meng, Zhaoyi Xu, Meirong Tang | Test the Weak Cosmic Supervision Conjecture in Dark Matter-Black Hole
System | null | Eur. Phys. J. C 83, 986 (2023) | 10.1140/epjc/s10052-023-12163-w | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There is a possibility that the event horizon of a Kerr-like black hole with
perfect fluid dark matter (DM) can be destroyed, providing a potential
opportunity for understanding the weak cosmic censorship conjecture of black
holes. In this study, we analyze the influence of the strength parameter of
perfect fluid DM ... | [
{
"created": "Thu, 24 Aug 2023 16:39:22 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Nov 2023 11:14:28 GMT",
"version": "v2"
}
] | 2023-11-02 | [
[
"Meng",
"Liping",
""
],
[
"Xu",
"Zhaoyi",
""
],
[
"Tang",
"Meirong",
""
]
] | There is a possibility that the event horizon of a Kerr-like black hole with perfect fluid dark matter (DM) can be destroyed, providing a potential opportunity for understanding the weak cosmic censorship conjecture of black holes. In this study, we analyze the influence of the strength parameter of perfect fluid DM on... |
1812.03419 | Jiawei Hu | Shijing Cheng, Hongwei Yu, Jiawei Hu | Quantum fluctuations of spacetime generate quantum entanglement between
gravitationally polarizable subsystems | 18 pages, 4 figures | Eur. Phys. J. C (2018) 78:954 | 10.1140/epjc/s10052-018-6433-5 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There should be quantum vacuum fluctuations of spacetime itself, if we accept
that the basic quantum principles we are already familiar with apply as well to
a quantum theory of gravity. In this paper, we study, in linearized quantum
gravity, the quantum entanglement generation at the neighborhood of the initial
time... | [
{
"created": "Sun, 9 Dec 2018 02:53:36 GMT",
"version": "v1"
}
] | 2018-12-11 | [
[
"Cheng",
"Shijing",
""
],
[
"Yu",
"Hongwei",
""
],
[
"Hu",
"Jiawei",
""
]
] | There should be quantum vacuum fluctuations of spacetime itself, if we accept that the basic quantum principles we are already familiar with apply as well to a quantum theory of gravity. In this paper, we study, in linearized quantum gravity, the quantum entanglement generation at the neighborhood of the initial time b... |
1805.00293 | Richard Brito | Richard Brito, Alessandra Buonanno, Vivien Raymond | Black-hole Spectroscopy by Making Full Use of Gravitational-Wave
Modeling | 12 pages. v2: references added, discussion improved and 3 new
figures. Matches published version | Phys. Rev. D 98, 084038 (2018) | 10.1103/PhysRevD.98.084038 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Kerr nature of a compact-object-coalescence remnant can be unveiled by
observing multiple quasi-normal modes (QNMs) in the post-merger signal. Current
methods to achieve this goal rely on matching the data with a superposition of
exponentially damped sinusoids with amplitudes fitted to numerical-relativity
(NR) s... | [
{
"created": "Tue, 1 May 2018 12:44:36 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Oct 2018 17:14:41 GMT",
"version": "v2"
}
] | 2018-10-31 | [
[
"Brito",
"Richard",
""
],
[
"Buonanno",
"Alessandra",
""
],
[
"Raymond",
"Vivien",
""
]
] | The Kerr nature of a compact-object-coalescence remnant can be unveiled by observing multiple quasi-normal modes (QNMs) in the post-merger signal. Current methods to achieve this goal rely on matching the data with a superposition of exponentially damped sinusoids with amplitudes fitted to numerical-relativity (NR) sim... |
2305.03504 | Daniel Blixt | Daniel Blixt, Manuel Hohmann, Tomi Koivisto, Luca Marzola | Teleparallel bigravity | 32 pages, 1 figure, matches published version | The European Physical Journal C, 83, 1120 (2023) | 10.1140/epjc/s10052-023-12247-7 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We write down the teleparallel equivalent to Hassan-Rosen bigravity, which is
written using a torsionful but curvature-free connection. The theories only
differ by a boundary term. The equivalence was proven, both by using
perturbation theory and Hamiltonian analysis. It is further shown how one can
construct novel b... | [
{
"created": "Fri, 5 May 2023 13:23:08 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Dec 2023 14:06:42 GMT",
"version": "v2"
}
] | 2023-12-13 | [
[
"Blixt",
"Daniel",
""
],
[
"Hohmann",
"Manuel",
""
],
[
"Koivisto",
"Tomi",
""
],
[
"Marzola",
"Luca",
""
]
] | We write down the teleparallel equivalent to Hassan-Rosen bigravity, which is written using a torsionful but curvature-free connection. The theories only differ by a boundary term. The equivalence was proven, both by using perturbation theory and Hamiltonian analysis. It is further shown how one can construct novel big... |
1802.02848 | Edward Malec | Janusz Karkowski, Wojciech Kulczycki, Patryk Mach, Edward Malec,
Andrzej Odrzywolek and Michal Pirog | Self-gravitating axially symmetric disks in general-relativistic
rotation | Misprints corrected, this version matches the published paper | Phys. Rev. D 97, 104017 (2018) | 10.1103/PhysRevD.97.104017 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We integrate numerically axially symmetric stationary Einstein equations
describing self-gravitating disks around spinless black holes. The numerical
scheme is based on a method developed by Shibata, but contains important new
ingredients. We derive a new general-relativistic Keplerian rotation law for
self-gravitati... | [
{
"created": "Thu, 8 Feb 2018 13:36:34 GMT",
"version": "v1"
},
{
"created": "Wed, 30 May 2018 09:29:24 GMT",
"version": "v2"
}
] | 2018-05-31 | [
[
"Karkowski",
"Janusz",
""
],
[
"Kulczycki",
"Wojciech",
""
],
[
"Mach",
"Patryk",
""
],
[
"Malec",
"Edward",
""
],
[
"Odrzywolek",
"Andrzej",
""
],
[
"Pirog",
"Michal",
""
]
] | We integrate numerically axially symmetric stationary Einstein equations describing self-gravitating disks around spinless black holes. The numerical scheme is based on a method developed by Shibata, but contains important new ingredients. We derive a new general-relativistic Keplerian rotation law for self-gravitating... |
1709.03242 | Abraham Espinoza-Garc\'ia | Abraham Espinoza-Garc\'ia (UPIIG-IPN, M\'exico), Efra\'in Torres-Lomas
(UG, M\'exico), Sinhu\'e Alejandro P\'erez-Pay\'an (UPIIG-IPN, M\'exico),
Luis Rey D\'iaz-Barr\'on (UPIIG-IPN, M\'exico) | Noncommutativity in Effective Loop Quantum Cosmology | null | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a noncommutative extension of the Loop Quantum Cosmology
effective scheme for the open FLRW model with a free scalar field via a theta
deformation. Firstly, a deformation is implemented in the configuration sector,
among the holonomy variable and the matter degree of freedom. We show that this
type of no... | [
{
"created": "Mon, 11 Sep 2017 04:51:31 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Sep 2017 05:02:29 GMT",
"version": "v2"
},
{
"created": "Sun, 2 Sep 2018 22:55:54 GMT",
"version": "v3"
}
] | 2018-09-06 | [
[
"Espinoza-García",
"Abraham",
"",
"UPIIG-IPN, México"
],
[
"Torres-Lomas",
"Efraín",
"",
"UG, México"
],
[
"Pérez-Payán",
"Sinhué Alejandro",
"",
"UPIIG-IPN, México"
],
[
"Díaz-Barrón",
"Luis Rey",
"",
"UPIIG-IPN, México"
]
] | We construct a noncommutative extension of the Loop Quantum Cosmology effective scheme for the open FLRW model with a free scalar field via a theta deformation. Firstly, a deformation is implemented in the configuration sector, among the holonomy variable and the matter degree of freedom. We show that this type of nonc... |
1405.1353 | Khrystyna Gnatenko | Kh. P. Gnatenko | Composite system in noncommutative space and the equivalence principle | 12 pages | Kh.P. Gnatenko Phys. Lett. A 377 (2013) 3061-3066 | 10.1016/j.physleta.2013.09.036 | null | gr-qc math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The motion of a composite system made of N particles is examined in a space
with a canonical noncommutative algebra of coordinates. It is found that the
coordinates of the center-of-mass position satisfy noncommutative algebra with
effective parameter. Therefore, the upper bound of the parameter of
noncommutativity i... | [
{
"created": "Mon, 5 May 2014 12:36:16 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Gnatenko",
"Kh. P.",
""
]
] | The motion of a composite system made of N particles is examined in a space with a canonical noncommutative algebra of coordinates. It is found that the coordinates of the center-of-mass position satisfy noncommutative algebra with effective parameter. Therefore, the upper bound of the parameter of noncommutativity is ... |
1106.1764 | Hossein Farajollahi | H. Farajollahi, A. Salehi, F. Tayebi | Entropy and statefinder diagnosis in chameleon cosmology | 11 pages, 5 figures. will be published in Astrophys. Space Sci | Astrophys Space Sci (2011) 335:629-634 | 10.1007/s10509-011-0775-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, the generalized second law (GSL) of thermodynamics and entropy
is revisited in the context of cosmological models with bouncing behavior such
as chameleon cosmology where the boundary of the universe is assumed to be
enclosed by the dynamical apparent horizon. From a thermodynamic point of view,
to lin... | [
{
"created": "Thu, 9 Jun 2011 09:53:16 GMT",
"version": "v1"
}
] | 2015-05-28 | [
[
"Farajollahi",
"H.",
""
],
[
"Salehi",
"A.",
""
],
[
"Tayebi",
"F.",
""
]
] | In this paper, the generalized second law (GSL) of thermodynamics and entropy is revisited in the context of cosmological models with bouncing behavior such as chameleon cosmology where the boundary of the universe is assumed to be enclosed by the dynamical apparent horizon. From a thermodynamic point of view, to link ... |
gr-qc/0410012 | Zolt\'an K\'ad\'ar | Z.Kadar | Polygon model from first order gravity | 20 pages, presentation improved, typos corrected | Class.Quant.Grav. 22 (2005) 809-824 | 10.1088/0264-9381/22/5/004 | null | gr-qc | null | The gauge fixed polygon model of 2+1 gravity with zero cosmological constant
and arbitrary number of spinless point particles is reconstructed from the
first order formalism of the theory in terms of the triad and the spin
connection. The induced symplectic structure is calculated and shown to agree
with the canonica... | [
{
"created": "Mon, 4 Oct 2004 07:40:55 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Jan 2005 21:20:27 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Kadar",
"Z.",
""
]
] | The gauge fixed polygon model of 2+1 gravity with zero cosmological constant and arbitrary number of spinless point particles is reconstructed from the first order formalism of the theory in terms of the triad and the spin connection. The induced symplectic structure is calculated and shown to agree with the canonical ... |
gr-qc/9903112 | Junichi Iwasaki | Junichi Iwasaki | A surface theoretic model of quantum gravity | Latex, 14 pages, No figure; Appendices added, References updated | null | null | null | gr-qc | null | A surface theoretic view of non-perturbative quantum gravity as "spin-foams"
was proposed by Baez. A possibility of constructing such a model was studied
some time ago based on (2+1) dimensional general relativity as a reformulation
of the Ponzano-Regge model in Riemannian spacetime. In the present work, a
model base... | [
{
"created": "Wed, 31 Mar 1999 19:56:46 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Jan 2000 04:35:01 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Iwasaki",
"Junichi",
""
]
] | A surface theoretic view of non-perturbative quantum gravity as "spin-foams" was proposed by Baez. A possibility of constructing such a model was studied some time ago based on (2+1) dimensional general relativity as a reformulation of the Ponzano-Regge model in Riemannian spacetime. In the present work, a model based ... |
1602.00822 | Jose Luis Bl\'azquez-Salcedo | Jose Luis Bl\'azquez-Salcedo, Jutta Kunz, Francisco Navarro-L\'erida,
Eugen Radu | Radial excitations of non-static $J=0$ black holes in
Einstein-Maxwell-Chern-Simons gravity | 6 pages, 2 figures | The Fourteenth Marcel Grossmann Meeting: pp. 1751-1756 (2017) | 10.1142/9789813226609_0179 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the generalization of the Kerr-Newmann black hole in 5D
Einstein-Maxwell-Chern-Simons theory with free Chern-Simons coupling parameter.
These black holes possess equal magnitude angular momenta and an event horizon
of spherical topology. We focus on the extremal case with zero temperature. We
find that, when... | [
{
"created": "Tue, 2 Feb 2016 08:09:30 GMT",
"version": "v1"
}
] | 2017-11-21 | [
[
"Blázquez-Salcedo",
"Jose Luis",
""
],
[
"Kunz",
"Jutta",
""
],
[
"Navarro-Lérida",
"Francisco",
""
],
[
"Radu",
"Eugen",
""
]
] | We study the generalization of the Kerr-Newmann black hole in 5D Einstein-Maxwell-Chern-Simons theory with free Chern-Simons coupling parameter. These black holes possess equal magnitude angular momenta and an event horizon of spherical topology. We focus on the extremal case with zero temperature. We find that, when t... |
1605.04676 | Jibitesh Dutta | Jibitesh Dutta, Saugata Mitra and Binod Chetry | Modified Bekenstein-Hawking system in $f(R)$ gravity | 16 pages, six figs. Accepted for publication in IJTP. Welcome
comments | null | 10.1007/s10773-016-3052-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present work deals with four alternative formulation of Bekenstein system
on event horizon in $f(R)$ gravity. While thermodynamical laws holds in
universe bounded by apparent horizon, these laws break down on event horizon.
With alternative formulation of thermodynamical parameters (temperature and
entropy), ther... | [
{
"created": "Mon, 16 May 2016 08:27:49 GMT",
"version": "v1"
}
] | 2016-05-27 | [
[
"Dutta",
"Jibitesh",
""
],
[
"Mitra",
"Saugata",
""
],
[
"Chetry",
"Binod",
""
]
] | The present work deals with four alternative formulation of Bekenstein system on event horizon in $f(R)$ gravity. While thermodynamical laws holds in universe bounded by apparent horizon, these laws break down on event horizon. With alternative formulation of thermodynamical parameters (temperature and entropy), thermo... |
2110.07016 | Markus P\"ossel | Markus P\"ossel | Light, delayed: The Shapiro Effect and the Newtonian Limit | 14 pages, 12 figures. Published in: K.-H. Lotze & Silvia Simionato
(eds.), Proceedings of the Heraeus Summer School "Astronomy from 4
Perspectives: Thinking Gravitational Lensing for Teaching" (Jena, 2-7 Sep
2019), pp. 42-54 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Shapiro effect, also known as the gravitational time delay, is close kin
to the gravitational deflection of light that was the central topic of our
Summer School. It is also an interesting test bed for exploring a topic that
provides the foundations for most of the calculations we have done in this
school, yet is... | [
{
"created": "Wed, 13 Oct 2021 20:22:16 GMT",
"version": "v1"
}
] | 2021-10-15 | [
[
"Pössel",
"Markus",
""
]
] | The Shapiro effect, also known as the gravitational time delay, is close kin to the gravitational deflection of light that was the central topic of our Summer School. It is also an interesting test bed for exploring a topic that provides the foundations for most of the calculations we have done in this school, yet is h... |
1501.06298 | Shao-Wen Wei | Shao-Wen Wei, Peng Cheng, Yi Zhong, Xiang-Nan Zhou | Shadow of noncommutative geometry inspired black hole | 18 pages, 6 figures, 3 tables | JCAP 08, 004 (2015) | 10.1088/1475-7516/2015/08/004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, the shadow casted by the rotating black hole inspired by
noncommutative geometry is investigated. In addition to the dimensionless spin
parameter $a/M_{0}$ with $M_{0}$ black hole mass and inclination angle $i$, the
dimensionless noncommutative parameter $\sqrt{\vartheta}/M_{0}$ is also found
to affect... | [
{
"created": "Mon, 26 Jan 2015 09:44:03 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Aug 2015 12:25:28 GMT",
"version": "v2"
}
] | 2015-08-18 | [
[
"Wei",
"Shao-Wen",
""
],
[
"Cheng",
"Peng",
""
],
[
"Zhong",
"Yi",
""
],
[
"Zhou",
"Xiang-Nan",
""
]
] | In this paper, the shadow casted by the rotating black hole inspired by noncommutative geometry is investigated. In addition to the dimensionless spin parameter $a/M_{0}$ with $M_{0}$ black hole mass and inclination angle $i$, the dimensionless noncommutative parameter $\sqrt{\vartheta}/M_{0}$ is also found to affect t... |
2209.11961 | Ugur Camci | Ugur Camci | Integration of the geodesic equations via Noether Symmetries | 13 pages, no figures | International Journal of Modern Physics, vol.31, No. 11, 2240011
(2022) | 10.1142/S0218271822400119 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Through this article, I will overview the use of Noether symmetry approach in
discussing the integration of geodesic equations for the geodesic Lagrangians
of spacetimes. I will also give some examples to reveal the efficiency of
Noether symmetry approach by finding the first integrals related for the
geodesic Lagran... | [
{
"created": "Sat, 24 Sep 2022 08:48:39 GMT",
"version": "v1"
}
] | 2022-09-27 | [
[
"Camci",
"Ugur",
""
]
] | Through this article, I will overview the use of Noether symmetry approach in discussing the integration of geodesic equations for the geodesic Lagrangians of spacetimes. I will also give some examples to reveal the efficiency of Noether symmetry approach by finding the first integrals related for the geodesic Lagrangi... |
1905.05565 | Nathan Johnson-McDaniel | Nathan K. Johnson-McDaniel (for the LIGO Scientific Collaboration and
Virgo Collaboration) | Summary of Tests of General Relativity with the Binary Black Hole
Signals from the LIGO-Virgo Catalog GWTC-1 | 8 pages, 3 figures, contribution to the 2019 Gravitation session of
the 54th Rencontres de Moriond; summary of arXiv:1903.04467; v2: small
updates to some results (includes some updates that did not make it into the
published version) | null | null | LIGO-P1900146 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We summarize the four tests of general relativity carried out using the ten
binary black hole signals detected by Advanced LIGO and Advanced Virgo and
included in their first catalog, GWTC-1. These events provide unprecedented
opportunities for testing the predictions of general relativity for the
gravitational wavef... | [
{
"created": "Tue, 14 May 2019 12:49:21 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Oct 2019 13:53:58 GMT",
"version": "v2"
}
] | 2019-10-22 | [
[
"Johnson-McDaniel",
"Nathan K.",
"",
"for the LIGO Scientific Collaboration and\n Virgo Collaboration"
]
] | We summarize the four tests of general relativity carried out using the ten binary black hole signals detected by Advanced LIGO and Advanced Virgo and included in their first catalog, GWTC-1. These events provide unprecedented opportunities for testing the predictions of general relativity for the gravitational wavefor... |
2304.07301 | Atanu Guha | Youngsub Yoon and Atanu Guha | Inflation and the late time acceleration from Hossenfelder-Verlinde
gravity | Previous numerical mistakes fixed. Simulations for four different
values of q. Connection with the fine structure constant suggested | null | null | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that Hossenfelder's covariant formulation of Verlinde's emergent
gravity predicts inflation and the late-time acceleration at the same time,
without assuming a separate field such as inflaton, whose sole purpose is
producing inflation. In particular, for the current deceleration parameter
$q=-0.95$ to $-0.55$... | [
{
"created": "Fri, 14 Apr 2023 05:48:06 GMT",
"version": "v1"
},
{
"created": "Thu, 4 May 2023 06:29:07 GMT",
"version": "v2"
},
{
"created": "Tue, 23 May 2023 05:10:27 GMT",
"version": "v3"
}
] | 2023-05-24 | [
[
"Yoon",
"Youngsub",
""
],
[
"Guha",
"Atanu",
""
]
] | We show that Hossenfelder's covariant formulation of Verlinde's emergent gravity predicts inflation and the late-time acceleration at the same time, without assuming a separate field such as inflaton, whose sole purpose is producing inflation. In particular, for the current deceleration parameter $q=-0.95$ to $-0.55$, ... |
0711.2424 | Francisco Lobo | Christian G. Boehmer, Tiberiu Harko, Francisco S. N. Lobo | Wormhole geometries with conformal motions | 7 pages. V2: clarifying comments added, to appear in Classical and
Quantum Gravity | Class.Quant.Grav.25:075016,2008 | 10.1088/0264-9381/25/7/075016 | null | gr-qc | null | Exact solutions of traversable wormholes were recently found under the
assumption of spherical symmetry and the existence of a non-static conformal
symmetry. In this paper, we verify that in the case of the conformally
symmetric spacetimes with a non-static vector field generating the symmetry,
the conformal factor $... | [
{
"created": "Thu, 15 Nov 2007 14:45:25 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Feb 2008 15:31:29 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Boehmer",
"Christian G.",
""
],
[
"Harko",
"Tiberiu",
""
],
[
"Lobo",
"Francisco S. N.",
""
]
] | Exact solutions of traversable wormholes were recently found under the assumption of spherical symmetry and the existence of a non-static conformal symmetry. In this paper, we verify that in the case of the conformally symmetric spacetimes with a non-static vector field generating the symmetry, the conformal factor $\p... |
gr-qc/0312050 | Andreas Rathke | Andreas Rathke | Constraining a possible dependence of Newton's constant on the Earth's
magnetic field | Comments in reply to gr-qc/0312091 added, typo in Eq. (28) corrected,
accepted for publication in Gravitation & Cosmology | Grav.Cosmol. 10 (2004) 224 | null | null | gr-qc | null | Some time ago Mbelek and Lachieze-Rey proposed that the discrepancy between
the results of the various measurements of Newton's constant could be explained
by introducing a gravielectric coupling between the Earth's gravitational and
magnetic fields mediated by two scalar fields. A critical assessment of this
model i... | [
{
"created": "Tue, 9 Dec 2003 09:57:47 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Aug 2004 09:07:14 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Rathke",
"Andreas",
""
]
] | Some time ago Mbelek and Lachieze-Rey proposed that the discrepancy between the results of the various measurements of Newton's constant could be explained by introducing a gravielectric coupling between the Earth's gravitational and magnetic fields mediated by two scalar fields. A critical assessment of this model is ... |
gr-qc/0611006 | Clifford M. Will | Gary Gibbons (DAMTP) and Clifford M. Will (Washington Univ. St. Louis) | On the Multiple Deaths of Whitehead's Theory of Gravity | 22 pages; to be submitted to Studies In History And Philosophy Of
Modern Physics | Stud.Hist.Philos.Mod.Phys.39:41-61,2008 | null | null | gr-qc hep-th physics.hist-ph | null | Whitehead's 1922 theory of gravitation continues to attract the attention of
philosophers, despite evidence presented in 1971 that it violates experiment.
We demonstrate that the theory strongly fails five quite different experimental
tests, and conclude that, notwithstanding its meritorious philosophical
underpinnin... | [
{
"created": "Wed, 1 Nov 2006 12:20:56 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Gibbons",
"Gary",
"",
"DAMTP"
],
[
"Will",
"Clifford M.",
"",
"Washington Univ. St. Louis"
]
] | Whitehead's 1922 theory of gravitation continues to attract the attention of philosophers, despite evidence presented in 1971 that it violates experiment. We demonstrate that the theory strongly fails five quite different experimental tests, and conclude that, notwithstanding its meritorious philosophical underpinnings... |
2105.00342 | Sanjar Shaymatov | Sanjar Shaymatov, Bakhtiyor Narzilloev, Ahmadjon Abdujabbarov, Cosimo
Bambi | Charged particle motion around a magnetized Reissner-Nordstr\"{o}m black
hole | 14 pages, 10 figures, 2 tables | Phys. Rev. D 103, 124066 (2021) | 10.1103/PhysRevD.103.124066 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the dynamics of neutral and charged test particles around
axially symmetric magnetized black hole spacetime. We consider its
electromagnetic field in the black hole vicinity and study its impact on the
dynamics of test particles. We determine the radius of the innermost stable
circular orbit (ISCO) for... | [
{
"created": "Sat, 1 May 2021 20:14:51 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Jun 2021 20:35:09 GMT",
"version": "v2"
}
] | 2021-07-07 | [
[
"Shaymatov",
"Sanjar",
""
],
[
"Narzilloev",
"Bakhtiyor",
""
],
[
"Abdujabbarov",
"Ahmadjon",
""
],
[
"Bambi",
"Cosimo",
""
]
] | We investigate the dynamics of neutral and charged test particles around axially symmetric magnetized black hole spacetime. We consider its electromagnetic field in the black hole vicinity and study its impact on the dynamics of test particles. We determine the radius of the innermost stable circular orbit (ISCO) for n... |
1112.2307 | Sergio Ulhoa | S.C. Ulhoa | On Dark Energy and Accelerated Reference Frames | 09 pages, no figures. Accepted for publication in Annalen der Physik | Annalen der Physik , Vol. 524, Issue 5, pp. 273-278, May 2012 | 10.1002/andp.201000168 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The paper is devoted to an explanation of the accelerated rate of expansion
of the Universe. Usually the acceleration of the Universe, which is described
by FRW metric, is due to dark energy. It is shown that this effect may be
considered as a manifestation of torsion tensor for a flat Universe in the
realm of Telepa... | [
{
"created": "Sat, 10 Dec 2011 22:39:12 GMT",
"version": "v1"
}
] | 2013-03-14 | [
[
"Ulhoa",
"S. C.",
""
]
] | The paper is devoted to an explanation of the accelerated rate of expansion of the Universe. Usually the acceleration of the Universe, which is described by FRW metric, is due to dark energy. It is shown that this effect may be considered as a manifestation of torsion tensor for a flat Universe in the realm of Telepara... |
1409.6529 | Matyas Vasuth | M\'aty\'as Vas\'uth | Hyperbolic capture of compact binaries | 7 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hyperbolic encounters of compact objects are common interactions in dense
environments. During this process a significant amount of gravitational
radiation is emitted depending on the parameters of the system. Here we give a
parametric description of the radial motion valid for general binary orbits and
the radiative... | [
{
"created": "Tue, 23 Sep 2014 13:38:07 GMT",
"version": "v1"
}
] | 2014-09-24 | [
[
"Vasúth",
"Mátyás",
""
]
] | Hyperbolic encounters of compact objects are common interactions in dense environments. During this process a significant amount of gravitational radiation is emitted depending on the parameters of the system. Here we give a parametric description of the radial motion valid for general binary orbits and the radiative e... |
1003.3151 | J. Ponce de Leon | J. Ponce de Leon | Schwarzschild-like exteriors for stars in Kaluza-Klein gravity | null | Black Holes and Galaxy Formation, Editors A.D. Wachter and R.J.
Propst (Nova Science Publishers, Inc. 2010) pp 331-353. | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we examine the effective four-dimensional world that emanates
from a general class of static spherical Ricci-flat solutions in Kaluza-Klein
gravity in $D$-dimensions. By means of dimensional reduction we obtain a family
of asymptotically flat Schwarzschild-like metrics for which all the components
of the... | [
{
"created": "Tue, 16 Mar 2010 14:07:38 GMT",
"version": "v1"
}
] | 2010-03-17 | [
[
"de Leon",
"J. Ponce",
""
]
] | In this work we examine the effective four-dimensional world that emanates from a general class of static spherical Ricci-flat solutions in Kaluza-Klein gravity in $D$-dimensions. By means of dimensional reduction we obtain a family of asymptotically flat Schwarzschild-like metrics for which all the components of the R... |
1410.2543 | Ana Alonso-Serrano | Ana Alonso-Serrano, Luis J. Garay, Guillermo A. Mena Marugan | Correlations across horizons in quantum cosmology | 10 pages, 5 figures | null | 10.1103/PhysRevD.90.124074 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Different spacetime regions separated by horizons are not related to each
other. We know that this statement holds for classical spacetimes. In this
paper we carry out a canonical quantization of a Kantowski-Sachs minisuperspace
model whose classical solutions exhibit both an event horizon and a
cosmological horizon ... | [
{
"created": "Thu, 9 Oct 2014 17:49:24 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Oct 2014 11:49:44 GMT",
"version": "v2"
}
] | 2015-06-23 | [
[
"Alonso-Serrano",
"Ana",
""
],
[
"Garay",
"Luis J.",
""
],
[
"Marugan",
"Guillermo A. Mena",
""
]
] | Different spacetime regions separated by horizons are not related to each other. We know that this statement holds for classical spacetimes. In this paper we carry out a canonical quantization of a Kantowski-Sachs minisuperspace model whose classical solutions exhibit both an event horizon and a cosmological horizon in... |
2307.11222 | Cong Zhang | Chun-Yen Lin, Xiangjing Liu, Yongge Ma, and Cong Zhang | Conformally Invariant Brans-Dicke Loop Quantum Cosmology: A Quantum
Geometric Model of Linking Theory | 16+1 pages, revised based on the published version | Physical Review D 108, 124074 (2023) | 10.1103/PhysRevD.108.124074 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The loop quantization of the conformal Brans-Dicke cosmology is explored in
the spatially flat and Bianchi-I setting. The scalar and conformal constraints
governing the canonical model are quantized using the loop techniques. The
physical Hilbert space of quantum spacetimes satisfying both quantum
constraints is then... | [
{
"created": "Thu, 20 Jul 2023 20:24:13 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Dec 2023 10:02:38 GMT",
"version": "v2"
}
] | 2023-12-29 | [
[
"Lin",
"Chun-Yen",
""
],
[
"Liu",
"Xiangjing",
""
],
[
"Ma",
"Yongge",
""
],
[
"Zhang",
"Cong",
""
]
] | The loop quantization of the conformal Brans-Dicke cosmology is explored in the spatially flat and Bianchi-I setting. The scalar and conformal constraints governing the canonical model are quantized using the loop techniques. The physical Hilbert space of quantum spacetimes satisfying both quantum constraints is then o... |
gr-qc/9709083 | Smirichinskii V. I. | V.N.Pervushin, V.I Smirichinski | Cosmological Vacuum in Unified Theories | 3 pages, Latex | null | null | JINR E2-97-155 | gr-qc | null | The unification of the Einstein theory of gravity with a conformal invariant
version of the standard model for electroweak interaction without the Higgs
potential is considered. In this theory, a module of the Higgs field is
absorbed by the scale factor component of metric so that the evolution of the
Universe and th... | [
{
"created": "Tue, 30 Sep 1997 15:25:28 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pervushin",
"V. N.",
""
],
[
"Smirichinski",
"V. I",
""
]
] | The unification of the Einstein theory of gravity with a conformal invariant version of the standard model for electroweak interaction without the Higgs potential is considered. In this theory, a module of the Higgs field is absorbed by the scale factor component of metric so that the evolution of the Universe and the ... |
gr-qc/0010030 | Anjan Ananda Sen | A. A. Sen, S. Sen and S. Sethi | Dissipative Fluid in Brans Dicke theory and late time acceleration | 5 pages, RevTex Style two eps figures, Conclusion section has been
rewritten,new references have been added and also new constraints for the
parameter \omega has been given. Accepted for publication in Physical Review
D | Phys.Rev. D63 (2001) 107501 | 10.1103/PhysRevD.63.107501 | MRI-P-001001 | gr-qc astro-ph | null | We have investigated the possibility of having a late time accelerated
expansion phase for the universe. We have used a dissipative fluid in
Brans-Dicke(BD) theory for this purpose. The model does not involve any
potential for the BD scalar field. We have obtained the best fit values for the
different parameters in o... | [
{
"created": "Mon, 9 Oct 2000 10:52:45 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Feb 2001 06:59:58 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Sen",
"A. A.",
""
],
[
"Sen",
"S.",
""
],
[
"Sethi",
"S.",
""
]
] | We have investigated the possibility of having a late time accelerated expansion phase for the universe. We have used a dissipative fluid in Brans-Dicke(BD) theory for this purpose. The model does not involve any potential for the BD scalar field. We have obtained the best fit values for the different parameters in our... |
1502.00914 | Paola Leaci Dr. | Paola Leaci and Reinhard Prix | Directed searches for continuous gravitational waves from binary
systems: parameter-space metrics and optimal Scorpius X-1 sensitivity | 25 pages, 8 figures | Phys. Rev. D 91, 102003 (2015) | 10.1103/PhysRevD.91.102003 | LIGO-P1500006-v3 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive simple analytic expressions for the (coherent and semi-coherent)
phase metrics of continuous-wave sources in low-eccentricity binary systems,
both for the long-segment and short- segment regimes (compared to the orbital
period). The resulting expressions correct and extend previous results found in
the lite... | [
{
"created": "Tue, 3 Feb 2015 16:32:51 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Apr 2015 16:43:36 GMT",
"version": "v2"
}
] | 2015-05-12 | [
[
"Leaci",
"Paola",
""
],
[
"Prix",
"Reinhard",
""
]
] | We derive simple analytic expressions for the (coherent and semi-coherent) phase metrics of continuous-wave sources in low-eccentricity binary systems, both for the long-segment and short- segment regimes (compared to the orbital period). The resulting expressions correct and extend previous results found in the litera... |
0912.0031 | Chris Verhaaren | Chris Verhaaren and Eric W. Hirschmann | Chaotic orbits for spinning particles in Schwarzschild spacetime | 11 pages, 17 figures | Phys.Rev.D81:124034,2010 | 10.1103/PhysRevD.81.124034 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the orbits of particles with spin in the Schwarzschild spacetime.
Using the Papapetrou-Dixon equations of motion for spinning particles, we solve
for the orbits and focus on those that exhibit chaos using both Poincar\'e maps
and Lyapunov exponents. In particular, we develop a method for comparing the
Lya... | [
{
"created": "Mon, 30 Nov 2009 21:55:46 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Jul 2010 19:07:22 GMT",
"version": "v2"
}
] | 2010-07-13 | [
[
"Verhaaren",
"Chris",
""
],
[
"Hirschmann",
"Eric W.",
""
]
] | We consider the orbits of particles with spin in the Schwarzschild spacetime. Using the Papapetrou-Dixon equations of motion for spinning particles, we solve for the orbits and focus on those that exhibit chaos using both Poincar\'e maps and Lyapunov exponents. In particular, we develop a method for comparing the Lyapu... |
1510.02384 | Eduardo Bittencourt | Eduardo Bittencourt, Jonas P. Pereira, Igor Smolyaninov and Vera N.
Smolyaninova | The flexibility of optical metrics | 8 pages, some improvements in the physical content. Accepted for
publication in Classical and Quantum Gravity | Class. Quant. Gravity 33, 165008 (2016) | 10.1088/0264-9381/33/16/165008 | null | gr-qc astro-ph.SR physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We firstly revisit the importance, naturalness and limitations of the
so-called optical metrics for describing the propagation of light rays in the
limit of geometric optics. We then exemplify their flexibility and
nontriviality in some nonlinear material media and in the context of nonlinear
theories of the electrom... | [
{
"created": "Thu, 8 Oct 2015 16:13:35 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Jul 2016 22:06:54 GMT",
"version": "v2"
}
] | 2016-11-17 | [
[
"Bittencourt",
"Eduardo",
""
],
[
"Pereira",
"Jonas P.",
""
],
[
"Smolyaninov",
"Igor",
""
],
[
"Smolyaninova",
"Vera N.",
""
]
] | We firstly revisit the importance, naturalness and limitations of the so-called optical metrics for describing the propagation of light rays in the limit of geometric optics. We then exemplify their flexibility and nontriviality in some nonlinear material media and in the context of nonlinear theories of the electromag... |
2012.01449 | Shahar Hod | Shahar Hod | A proof of the strong cosmic censorship conjecture | 6 pages. This essay is awarded 3rd Prize in the 2020 Essay
Competition of the Gravity Research Foundation | International Journal of Modern Physics D 29, 2042003 (2020) | 10.1142/S0218271820420031 | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | The Penrose strong cosmic censorship conjecture asserts that Cauchy horizons
inside dynamically formed black holes are unstable to remnant matter fields
that fall into the black holes. The physical importance of this conjecture
stems from the fact that it provides a necessary condition for general
relativity to be a ... | [
{
"created": "Wed, 2 Dec 2020 19:00:07 GMT",
"version": "v1"
}
] | 2021-02-03 | [
[
"Hod",
"Shahar",
""
]
] | The Penrose strong cosmic censorship conjecture asserts that Cauchy horizons inside dynamically formed black holes are unstable to remnant matter fields that fall into the black holes. The physical importance of this conjecture stems from the fact that it provides a necessary condition for general relativity to be a tr... |
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