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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0908.3780 | H. D. Zeh | H. D. Zeh | Open Questions regarding the Arrow of Time | 14 pages - To appear in The Arrow of Time, Mersini-Houghton, L., and
Vaas, R., edts. (Springer). v2: minor changes and added comments | The Arrow of Time (Springer, Heidelberg, 2012), pp. 205-217 | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Conceptual problems regarding the arrow of time in classical physics, quantum
physics, cosmology, and quantum gravity are discussed. Particular attention is
paid to the dynamical role of the quantum indeterminism, and to various
concepts of timelessness.
| [
{
"created": "Wed, 26 Aug 2009 12:25:53 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Sep 2009 08:39:35 GMT",
"version": "v2"
}
] | 2012-07-30 | [
[
"Zeh",
"H. D.",
""
]
] | Conceptual problems regarding the arrow of time in classical physics, quantum physics, cosmology, and quantum gravity are discussed. Particular attention is paid to the dynamical role of the quantum indeterminism, and to various concepts of timelessness. |
1510.05054 | Gabriele Umberto Varieschi | Gabriele U. Varieschi and Kellie L. Ault | Wormhole geometries in fourth-order conformal Weyl gravity | Minor changes and one equation added, 22 pages, including 4 figures,
published in Int. J. Mod. Phys. D, Online Ready: 12 April 2016 | Int.J.Mod.Phys. D25 (2016) no.06, 1650064 | 10.1142/S0218271816500644 | null | gr-qc physics.pop-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an analysis of the classic wormhole geometries based on conformal
Weyl gravity, rather than standard general relativity. The main characteristics
of the resulting traversable wormholes remain the same as in the seminal study
by Morris and Thorne, namely, that effective super-luminal motion is a viable
cons... | [
{
"created": "Sat, 17 Oct 2015 00:21:13 GMT",
"version": "v1"
},
{
"created": "Sat, 31 Oct 2015 00:18:19 GMT",
"version": "v2"
},
{
"created": "Sat, 23 Apr 2016 18:22:20 GMT",
"version": "v3"
}
] | 2016-05-26 | [
[
"Varieschi",
"Gabriele U.",
""
],
[
"Ault",
"Kellie L.",
""
]
] | We present an analysis of the classic wormhole geometries based on conformal Weyl gravity, rather than standard general relativity. The main characteristics of the resulting traversable wormholes remain the same as in the seminal study by Morris and Thorne, namely, that effective super-luminal motion is a viable conseq... |
1312.2860 | Subhajit Saha | Subenoy Chakraborty and Subhajit Saha | A study of different horizons in inhomogeneous LTB cosmological model | 15 pages | Modern Physics Letters A 30, 1550024 (2015) | 10.1142/S0217732315500248 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work deals with a detailed study of the dynamics of the apparent, event
and particle horizons in the background of the inhomogeneous LTB spacetime. The
comparative study among these horizons shows a distinct character for apparent
horizon compared to the other horizons. The apparent horizon will be a trapping
ho... | [
{
"created": "Sat, 7 Dec 2013 08:21:14 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Mar 2015 08:09:06 GMT",
"version": "v2"
}
] | 2016-05-04 | [
[
"Chakraborty",
"Subenoy",
""
],
[
"Saha",
"Subhajit",
""
]
] | This work deals with a detailed study of the dynamics of the apparent, event and particle horizons in the background of the inhomogeneous LTB spacetime. The comparative study among these horizons shows a distinct character for apparent horizon compared to the other horizons. The apparent horizon will be a trapping hori... |
1311.2215 | Omar Valdivia | Jos\'e D\'iaz, Octavio Fierro, Fernando Izaurieta, Nelson Merino,
Eduardo Rodr\'iguez, Patricio Salgado and Omar Valdivia | A generalized action for $\left( 2 + 1 \right)$-dimensional
Chern--Simons gravity | null | J.Phys. A45 (2012) 255207 | 10.1088/1751-8113/45/25/255207 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the so-called semi-simple extended Poincar\'{e} (SSEP) algebra
in $D$ dimensions can be obtained from the anti-de~Sitter algebra
$\mathfrak{so} \left( D-1,2 \right)$ by means of the $S$-expansion procedure
with an appropriate semigroup $S$. A general prescription is given for
computing Casimir operators ... | [
{
"created": "Sat, 9 Nov 2013 21:17:58 GMT",
"version": "v1"
}
] | 2013-11-12 | [
[
"Díaz",
"José",
""
],
[
"Fierro",
"Octavio",
""
],
[
"Izaurieta",
"Fernando",
""
],
[
"Merino",
"Nelson",
""
],
[
"Rodríguez",
"Eduardo",
""
],
[
"Salgado",
"Patricio",
""
],
[
"Valdivia",
"Omar",
""
]
] | We show that the so-called semi-simple extended Poincar\'{e} (SSEP) algebra in $D$ dimensions can be obtained from the anti-de~Sitter algebra $\mathfrak{so} \left( D-1,2 \right)$ by means of the $S$-expansion procedure with an appropriate semigroup $S$. A general prescription is given for computing Casimir operators fo... |
1902.03414 | Cosimo Bambi | Bakhtiyor Narzilloev, Ahmadjon Abdujabbarov, Cosimo Bambi, Bobomurat
Ahmedov | Charged particle motion around a quasi-Kerr compact object immersed in
an external magnetic field | 13 pages, 4 figures. v2: refereed version | Phys. Rev. D 99, 104009 (2019) | 10.1103/PhysRevD.99.104009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the electromagnetic fields around a quasi-Kerr compact object
assuming it is immersed in an external asymptotically uniform magnetic field.
Using the Wald method, components of the electromagnetic field in orthonormal
basis have been obtained. We explore the charged particle motion around
deformed Kerr com... | [
{
"created": "Sat, 9 Feb 2019 11:55:17 GMT",
"version": "v1"
},
{
"created": "Wed, 8 May 2019 12:20:42 GMT",
"version": "v2"
}
] | 2019-05-09 | [
[
"Narzilloev",
"Bakhtiyor",
""
],
[
"Abdujabbarov",
"Ahmadjon",
""
],
[
"Bambi",
"Cosimo",
""
],
[
"Ahmedov",
"Bobomurat",
""
]
] | We explore the electromagnetic fields around a quasi-Kerr compact object assuming it is immersed in an external asymptotically uniform magnetic field. Using the Wald method, components of the electromagnetic field in orthonormal basis have been obtained. We explore the charged particle motion around deformed Kerr compa... |
gr-qc/0009089 | Paolo Matteucci | N. Andersson and G.L. Comer | Slowly Rotating General Relativistic Superfluid Neutron Stars | 28 pages RevTex, 13 figures | Class.Quant.Grav. 18 (2001) 969-1002 | 10.1088/0264-9381/18/6/302 | null | gr-qc astro-ph | null | We present a general formalism to treat slowly rotating general relativistic
superfluid neutron stars. As a first approximation, their matter content can be
described in terms of a two-fluid model, where one fluid is the neutron
superfluid, which is believed to exist in the core and inner crust of mature
neutron star... | [
{
"created": "Tue, 26 Sep 2000 11:44:26 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Andersson",
"N.",
""
],
[
"Comer",
"G. L.",
""
]
] | We present a general formalism to treat slowly rotating general relativistic superfluid neutron stars. As a first approximation, their matter content can be described in terms of a two-fluid model, where one fluid is the neutron superfluid, which is believed to exist in the core and inner crust of mature neutron stars,... |
gr-qc/0402126 | Marcelo Salgado | Marcelo Salgado, Daniel Sudarsky and Ulises Nucamendi | The violation of the weak energy condition, Is it generic of spontaneous
scalarization ? | 9 pages; 3 figures; Submitted to Phys. Rev. D | Phys.Rev. D70 (2004) 084027 | 10.1103/PhysRevD.70.084027 | null | gr-qc astro-ph | null | It was recently shown by Whinnett & Torres \cite{WT} that the phenomenon of
spontaneous scalarization (SC) in compact objects (polytropes) was accompanied
also by a {\it spontaneous violation of the weak energy condition} (WEC).
Notably, by the encounter of negative-energy densities at several star places
as measured... | [
{
"created": "Fri, 27 Feb 2004 18:41:30 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Mar 2004 00:21:08 GMT",
"version": "v2"
},
{
"created": "Sat, 10 Jul 2004 08:15:38 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Salgado",
"Marcelo",
""
],
[
"Sudarsky",
"Daniel",
""
],
[
"Nucamendi",
"Ulises",
""
]
] | It was recently shown by Whinnett & Torres \cite{WT} that the phenomenon of spontaneous scalarization (SC) in compact objects (polytropes) was accompanied also by a {\it spontaneous violation of the weak energy condition} (WEC). Notably, by the encounter of negative-energy densities at several star places as measured b... |
2105.09811 | Abhik Kumar Sanyal Dr. | Subhra Debnath and Abhik Kumar Sanyal | Canonical equivalence, quantization and anisotropic inflation in higher
order theory of gravity | 28 pages. 0 figures | Class. Quantum Grav. 38 (2021) 125010 (31pp) | 10.1088/1361-6382/abf1c8 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct phase-space structure of a typical higher-order theory of
gravity, in the background of anisotropic Bianchi-1 mini-superspace, following
`Modified Horowitz Formalism' as well as applying `Dirac Algorithm' (after
taking care of the divergent terms), and establish equivalence. Canonical
quantization, and s... | [
{
"created": "Thu, 20 May 2021 15:06:31 GMT",
"version": "v1"
}
] | 2021-05-21 | [
[
"Debnath",
"Subhra",
""
],
[
"Sanyal",
"Abhik Kumar",
""
]
] | We construct phase-space structure of a typical higher-order theory of gravity, in the background of anisotropic Bianchi-1 mini-superspace, following `Modified Horowitz Formalism' as well as applying `Dirac Algorithm' (after taking care of the divergent terms), and establish equivalence. Canonical quantization, and sem... |
gr-qc/0303018 | Patrick Christopher Fragile | P. Chris Fragile and Peter Anninos | Hydrodynamic Stability of Cosmological Quark-Hadron Phase Transitions | 24 pages, 8 BW figures, 6 color figures; Accepted for publication in
Phys. Rev. D | Phys.Rev. D67 (2003) 103010 | 10.1103/PhysRevD.67.103010 | null | gr-qc astro-ph | null | Recent results from linear perturbation theory suggest that first-order
cosmological quark-hadron phase transitions occurring as deflagrations may be
``borderline'' unstable, and those occurring as detonations may give rise to
growing modes behind the interface boundary. However, since nonlinear effects
can play impo... | [
{
"created": "Tue, 4 Mar 2003 23:08:00 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Fragile",
"P. Chris",
""
],
[
"Anninos",
"Peter",
""
]
] | Recent results from linear perturbation theory suggest that first-order cosmological quark-hadron phase transitions occurring as deflagrations may be ``borderline'' unstable, and those occurring as detonations may give rise to growing modes behind the interface boundary. However, since nonlinear effects can play import... |
2305.15902 | Ernesto Nungesser | Ho Lee, Ernesto Nungesser, John Stalker and Paul Tod | Well-posedness of anisotropic and homogeneous solutions to the
Einstein-Boltzmann system with a conformal-gauge singularity | 75 pages, errata corrected and references added | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the Einstein-Boltzmann system for massless particles in the
Bianchi I space-time with scattering cross-sections in a certain range of soft
potentials. We assume that the space-time has an initial conformal gauge
singularity and show that the initial value problem is well posed with data
given at the singu... | [
{
"created": "Thu, 25 May 2023 10:04:55 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Aug 2024 13:25:55 GMT",
"version": "v2"
}
] | 2024-08-13 | [
[
"Lee",
"Ho",
""
],
[
"Nungesser",
"Ernesto",
""
],
[
"Stalker",
"John",
""
],
[
"Tod",
"Paul",
""
]
] | We consider the Einstein-Boltzmann system for massless particles in the Bianchi I space-time with scattering cross-sections in a certain range of soft potentials. We assume that the space-time has an initial conformal gauge singularity and show that the initial value problem is well posed with data given at the singula... |
1710.11045 | Yong Xiao | Yong Xiao | Some thoughts on constructing a microscopic theory with holographic
degrees of freedom | 6 pages, typos corrected | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Holographic principle states that the maximum entropy of a system is its
boundary area in Planck units. However, such a holographic entropy cannot be
realized by the conventional quantum field theory. We need a new microscopic
theory which naturally possesses all the holographic degrees of freedom. In
this paper, we ... | [
{
"created": "Mon, 30 Oct 2017 16:24:56 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Nov 2017 06:58:56 GMT",
"version": "v2"
}
] | 2017-11-21 | [
[
"Xiao",
"Yong",
""
]
] | Holographic principle states that the maximum entropy of a system is its boundary area in Planck units. However, such a holographic entropy cannot be realized by the conventional quantum field theory. We need a new microscopic theory which naturally possesses all the holographic degrees of freedom. In this paper, we pr... |
2105.08659 | Juliano Neves | R. V. Maluf, Juliano C. S. Neves | Bumblebee field as a source of cosmological anisotropies | 11 pages and 3 figures. v3: minor changes, published in Journal of
Cosmology and Astroparticle Physics | JCAP 10 (2021) 038 | 10.1088/1475-7516/2021/10/038 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, a bumblebee field is adopted in order to generate cosmological
anisotropies. For that purpose, we assume a Bianchi I cosmology, as the
background geometry, and a bumblebee field coupled to it. Bumblebee models are
examples of a mechanism for the Lorentz symmetry violation by assuming a
nonzero vacuum ex... | [
{
"created": "Tue, 18 May 2021 16:41:42 GMT",
"version": "v1"
},
{
"created": "Tue, 25 May 2021 04:12:40 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Oct 2021 14:21:25 GMT",
"version": "v3"
}
] | 2021-10-15 | [
[
"Maluf",
"R. V.",
""
],
[
"Neves",
"Juliano C. S.",
""
]
] | In this work, a bumblebee field is adopted in order to generate cosmological anisotropies. For that purpose, we assume a Bianchi I cosmology, as the background geometry, and a bumblebee field coupled to it. Bumblebee models are examples of a mechanism for the Lorentz symmetry violation by assuming a nonzero vacuum expe... |
2007.12049 | Jan Sbierski | Jan Sbierski | On holonomy singularities in general relativity and the
$C^{0,1}_{\mathrm{loc}}$-inextendibility of spacetimes | 43 pages, v2: minor changes to presentation, version accepted by DMJ | null | null | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper investigates the structure of gravitational singularities at the
level of the connection. We show in particular that for FLRW spacetimes with
particle horizons a local holonomy, which is related to a gravitational energy,
becomes unbounded near the big-bang singularity. This implies the
$C^{0,1}_{\mathrm{l... | [
{
"created": "Thu, 23 Jul 2020 14:58:04 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Oct 2021 09:57:31 GMT",
"version": "v2"
}
] | 2021-10-08 | [
[
"Sbierski",
"Jan",
""
]
] | This paper investigates the structure of gravitational singularities at the level of the connection. We show in particular that for FLRW spacetimes with particle horizons a local holonomy, which is related to a gravitational energy, becomes unbounded near the big-bang singularity. This implies the $C^{0,1}_{\mathrm{loc... |
1605.04789 | Ramit Dey | Ramit Dey, Stefano Liberati, Arif Mohd | Higher derivative gravity: field equation as the equation of state | 10 pages, 2 figures | Phys. Rev. D 94, 044013 (2016) | 10.1103/PhysRevD.94.044013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the striking features of general relativity is that the Einstein
equation is implied by the Clausius relation imposed on a small patch of
locally constructed causal horizon. Extension of this thermodynamic derivation
of the field equation to more general theories of gravity has been attempted
many times in the... | [
{
"created": "Mon, 16 May 2016 14:54:18 GMT",
"version": "v1"
}
] | 2016-08-17 | [
[
"Dey",
"Ramit",
""
],
[
"Liberati",
"Stefano",
""
],
[
"Mohd",
"Arif",
""
]
] | One of the striking features of general relativity is that the Einstein equation is implied by the Clausius relation imposed on a small patch of locally constructed causal horizon. Extension of this thermodynamic derivation of the field equation to more general theories of gravity has been attempted many times in the l... |
1109.4769 | Frederic H. Vincent | Frederic H. Vincent, Thibaut Paumard, Eric Gourgoulhon, Guy Perrin | GYOTO: a new general relativistic ray-tracing code | 20 pages, 11 figures | Classical and Quantum Gravity 28, 225011 (2011) | 10.1088/0264-9381/28/22/225011 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | GYOTO, a general relativistic ray-tracing code, is presented. It aims at
computing images of astronomical bodies in the vicinity of compact objects, as
well as trajectories of massive bodies in relativistic environments. This code
is capable of integrating the null and timelike geodesic equations not only in
the Kerr... | [
{
"created": "Thu, 22 Sep 2011 10:59:47 GMT",
"version": "v1"
}
] | 2012-03-15 | [
[
"Vincent",
"Frederic H.",
""
],
[
"Paumard",
"Thibaut",
""
],
[
"Gourgoulhon",
"Eric",
""
],
[
"Perrin",
"Guy",
""
]
] | GYOTO, a general relativistic ray-tracing code, is presented. It aims at computing images of astronomical bodies in the vicinity of compact objects, as well as trajectories of massive bodies in relativistic environments. This code is capable of integrating the null and timelike geodesic equations not only in the Kerr m... |
1805.02894 | Diego Pavon | Jose P. Mimoso and Diego Pavon | Fluctuations of the flux of energy on the apparent horizon | 4 pages, no figures. Key words: Mathematical cosmology, statistical
physics. It matches published version | Physical Review D 97, 103537 (2018) | 10.1103/PhysRevD.97.103537 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Adopting the Landau-Lifshiftz method of classical fluctuations we determine
the statistical average strength of the fluctuations of the energy flux on the
apparent horizon of a homogeneous and isotropic universe described by Einstein
gravity. We find that the fluctuations increase with the temperature of the
horizon ... | [
{
"created": "Tue, 8 May 2018 08:30:17 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Jun 2018 10:03:31 GMT",
"version": "v2"
}
] | 2018-07-04 | [
[
"Mimoso",
"Jose P.",
""
],
[
"Pavon",
"Diego",
""
]
] | Adopting the Landau-Lifshiftz method of classical fluctuations we determine the statistical average strength of the fluctuations of the energy flux on the apparent horizon of a homogeneous and isotropic universe described by Einstein gravity. We find that the fluctuations increase with the temperature of the horizon an... |
2011.06130 | Takuya Tsutsui | Takuya Tsutsui, Atsushi Nishizawa, Soichiro Morisaki | Early warning of precessing compact binary merger with third-generation
gravitational-wave detectors | null | Phys. Rev. D 104, 064013 (2021) | 10.1103/PhysRevD.104.064013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Rapid localization of gravitational-wave events is important for the success
of the multi-messenger observations. The forthcoming improvements and
constructions of gravitational-wave detectors will enable detecting and
localizing compact-binary coalescence events even before mergers, which is
called early warning. Th... | [
{
"created": "Thu, 12 Nov 2020 00:23:54 GMT",
"version": "v1"
}
] | 2021-09-15 | [
[
"Tsutsui",
"Takuya",
""
],
[
"Nishizawa",
"Atsushi",
""
],
[
"Morisaki",
"Soichiro",
""
]
] | Rapid localization of gravitational-wave events is important for the success of the multi-messenger observations. The forthcoming improvements and constructions of gravitational-wave detectors will enable detecting and localizing compact-binary coalescence events even before mergers, which is called early warning. The ... |
1505.00174 | Guillem Dom\`enech | Guillem Dom\`enech, Atsushi Naruko and Misao Sasaki | Cosmological disformal invariance | 23 pages + Appendix, updated version | JCAP 1510, no. 10, 067 (2015) | 10.1088/1475-7516/2015/10/067 | YITP-15-22 | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The invariance of physical observables under disformal transformations is
considered. It is known that conformal transformations leave physical
observables invariant. However, whether it is true for disformal
transformations is still an open question. In this paper, it is shown that a
pure disformal transformation wi... | [
{
"created": "Fri, 1 May 2015 13:10:19 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Jun 2016 06:19:23 GMT",
"version": "v2"
}
] | 2016-06-20 | [
[
"Domènech",
"Guillem",
""
],
[
"Naruko",
"Atsushi",
""
],
[
"Sasaki",
"Misao",
""
]
] | The invariance of physical observables under disformal transformations is considered. It is known that conformal transformations leave physical observables invariant. However, whether it is true for disformal transformations is still an open question. In this paper, it is shown that a pure disformal transformation with... |
0911.0883 | Alberto Carrasco Ferreira | Alberto Carrasco, Marc Mars | A counter-example to a recent version of the Penrose conjecture | 12 pages. Appendix added with technical details. To appear in
Classical and Quantum Gravity | null | 10.1088/0264-9381/27/6/062001 | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By considering suitable axially symmetric slices on the Kruskal spacetime, we
construct counterexamples to a recent version of the Penrose inequality in
terms of so-called generalized apparent horizons.
| [
{
"created": "Wed, 4 Nov 2009 17:18:58 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Feb 2010 12:47:16 GMT",
"version": "v2"
}
] | 2015-05-14 | [
[
"Carrasco",
"Alberto",
""
],
[
"Mars",
"Marc",
""
]
] | By considering suitable axially symmetric slices on the Kruskal spacetime, we construct counterexamples to a recent version of the Penrose inequality in terms of so-called generalized apparent horizons. |
1401.3028 | Michael Coughlin | Michael Coughlin and Jan Harms | Upper Limit on a Stochastic Background of Gravitational Waves from
Seismic Measurements in the Range 0.05 Hz to 1 Hz | null | null | 10.1103/PhysRevLett.112.101102 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we present an upper limit of $\Omega_{\rm GW}<1.2\times
10^{8}$ on an isotropic stochastic gravitational-wave (GW) background
integrated over a year in the frequency range 0.05 Hz - 1 Hz, which improves
current upper limits from high-precision laboratory experiments by about 9
orders of magnitude. The ... | [
{
"created": "Mon, 13 Jan 2014 22:30:26 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Coughlin",
"Michael",
""
],
[
"Harms",
"Jan",
""
]
] | In this paper, we present an upper limit of $\Omega_{\rm GW}<1.2\times 10^{8}$ on an isotropic stochastic gravitational-wave (GW) background integrated over a year in the frequency range 0.05 Hz - 1 Hz, which improves current upper limits from high-precision laboratory experiments by about 9 orders of magnitude. The li... |
1704.08040 | Christof Wetterich | C. Wetterich | Graviton fluctuations erase the cosmological constant | extended discussion, new references, 14 pages, 2 figures | null | 10.1016/j.physletb.2017.08.002 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Graviton fluctuations induce strong non-perturbative infrared renormalization
effects for the cosmological constant. The functional renormalization flow
drives a positive cosmological constant towards zero, solving the cosmological
constant problem without the need to tune parameters. We propose a simple
computation ... | [
{
"created": "Wed, 26 Apr 2017 10:09:57 GMT",
"version": "v1"
},
{
"created": "Fri, 5 May 2017 11:14:19 GMT",
"version": "v2"
}
] | 2017-09-13 | [
[
"Wetterich",
"C.",
""
]
] | Graviton fluctuations induce strong non-perturbative infrared renormalization effects for the cosmological constant. The functional renormalization flow drives a positive cosmological constant towards zero, solving the cosmological constant problem without the need to tune parameters. We propose a simple computation of... |
1212.4456 | Javier E. Cuch\'i | Javier E. Cuch\'i, Antonio Gil-Rivero, Alfred Molina and Eduardo Ruiz | An approximate global solution of Einstein's equation for a rotating
compact source with linear equation of state | 21 pages. Several improvements to the text. Final version | Gen. Relativ. Gravit. (2013). Published Online First: 4th April
2013 | 10.1007/s10714-013-1528-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use analytic perturbation theory to present a new approximate metric for a
rigidly rotating perfect fluid source with equation of state (EOS)
$\epsilon+(1-n)p=\epsilon_0$. This EOS includes the interesting cases of
strange matter, constant density and the fluid of the Wahlquist metric. It is
fully matched to its a... | [
{
"created": "Tue, 18 Dec 2012 18:52:45 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Apr 2013 20:00:03 GMT",
"version": "v2"
}
] | 2013-04-15 | [
[
"Cuchí",
"Javier E.",
""
],
[
"Gil-Rivero",
"Antonio",
""
],
[
"Molina",
"Alfred",
""
],
[
"Ruiz",
"Eduardo",
""
]
] | We use analytic perturbation theory to present a new approximate metric for a rigidly rotating perfect fluid source with equation of state (EOS) $\epsilon+(1-n)p=\epsilon_0$. This EOS includes the interesting cases of strange matter, constant density and the fluid of the Wahlquist metric. It is fully matched to its app... |
1706.09315 | Mahouton J. Stephane Houndjo Dr | M. J. S. Houndjo | Unimodular $f(G)$ gravity | 14 pages | Eur.Phys.J. C77 (2017) no.9, 607 | 10.1140/epjc/s10052-017-5171-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study a modified version of unimodular general relativity in
the context of $f(G)$, $G$ denoting the Gauss-Bonnet invariant. We attach
attention to Bianchi-type I and Friendmann-Robertson-Walker universes and
search for unimodular $f(G)$ models according to the de Sitter and power-law
solutions. Assu... | [
{
"created": "Wed, 28 Jun 2017 14:31:42 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Jul 2017 14:45:38 GMT",
"version": "v2"
}
] | 2017-10-25 | [
[
"Houndjo",
"M. J. S.",
""
]
] | In this paper we study a modified version of unimodular general relativity in the context of $f(G)$, $G$ denoting the Gauss-Bonnet invariant. We attach attention to Bianchi-type I and Friendmann-Robertson-Walker universes and search for unimodular $f(G)$ models according to the de Sitter and power-law solutions. Assumi... |
gr-qc/0003070 | Michael A. Clayton | M.A. Clayton and J.W. Moffat | Vector field mediated models of dynamical light velocity | 16 pages, uses amsart | Int.J.Mod.Phys.D11:187-206,2002 | 10.1142/S0218271802001457 | null | gr-qc astro-ph hep-ph hep-th | null | A vector-tensor theory of gravity that was introduced in an earlier
publication is analyzed in detail and its consequences for early universe
cosmology are examined. The multiple light cone structure of the theory
generates different speeds of gravitational and matter wave fronts, and the
contraction of these light c... | [
{
"created": "Fri, 17 Mar 2000 03:17:24 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Clayton",
"M. A.",
""
],
[
"Moffat",
"J. W.",
""
]
] | A vector-tensor theory of gravity that was introduced in an earlier publication is analyzed in detail and its consequences for early universe cosmology are examined. The multiple light cone structure of the theory generates different speeds of gravitational and matter wave fronts, and the contraction of these light con... |
1409.7153 | Yu-Tong Wang | Yu-Tong Wang, Yun-Song Piao | Parity violation in pre-inflationary bounce | 15 pages, 4 figures,the final version | null | 10.1016/j.physletb.2014.12.011 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The power suppression at largest scale in the CMB TT powerspectrum might
imply the occurrence of a pre-inflationary bounce. We calculate the circularly
polarized gravitational wave, leaded by the gravitational Chern-Simons term
which universally appears in particle physics and string theory, in an
inflationary backgr... | [
{
"created": "Thu, 25 Sep 2014 04:44:41 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Sep 2014 06:33:31 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Dec 2014 01:44:54 GMT",
"version": "v3"
}
] | 2018-05-09 | [
[
"Wang",
"Yu-Tong",
""
],
[
"Piao",
"Yun-Song",
""
]
] | The power suppression at largest scale in the CMB TT powerspectrum might imply the occurrence of a pre-inflationary bounce. We calculate the circularly polarized gravitational wave, leaded by the gravitational Chern-Simons term which universally appears in particle physics and string theory, in an inflationary backgrou... |
gr-qc/0209050 | Mamdouh Wanas | M.I.Wanas | Absolute Parallelism Geometry: Developments, Applications and Problems | 12 Pages Tex file. A version of this paper has been published in the
Proceeding of the 11th conference on "Finsler, Lagrange and Hamilton
Geometry", held in Romania (Bacau, Feb. 2000) | Stud.Cercet.Stiin.Ser.Mat 10:,297-309,2001 | null | null | gr-qc math.DG | null | Absolute parallelism geometry is frequently used for physical applications.
It has two main defects, from the point of view of applications. The first is
the identical vanishing of its curvature tensor. The second is that its
autoparallel paths do not represent physical trajectories. The present work
shows how these ... | [
{
"created": "Tue, 17 Sep 2002 12:27:13 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Wanas",
"M. I.",
""
]
] | Absolute parallelism geometry is frequently used for physical applications. It has two main defects, from the point of view of applications. The first is the identical vanishing of its curvature tensor. The second is that its autoparallel paths do not represent physical trajectories. The present work shows how these de... |
1410.7539 | Delsate T\'erence | Y. Brihaye, T. Delsate, N. Sawado and H. Yoshii | Dirac equation for sphercially symmetric $AdS_5$ space-time and
application to a boson star in EGB gravity | 15 pages, 5 figures | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the Dirac equation in a curved 5-dimensional spherically symmetric
space-time. The angular part of the solutions is thoroughly studied, in a
formulation suited for extending to rotating space-times with equal angular
momenta. It has a symmetry $SU(2)\times U(1)$ and is implemented by the Wigner
functions. ... | [
{
"created": "Tue, 28 Oct 2014 07:43:42 GMT",
"version": "v1"
}
] | 2014-10-29 | [
[
"Brihaye",
"Y.",
""
],
[
"Delsate",
"T.",
""
],
[
"Sawado",
"N.",
""
],
[
"Yoshii",
"H.",
""
]
] | We discuss the Dirac equation in a curved 5-dimensional spherically symmetric space-time. The angular part of the solutions is thoroughly studied, in a formulation suited for extending to rotating space-times with equal angular momenta. It has a symmetry $SU(2)\times U(1)$ and is implemented by the Wigner functions. Th... |
gr-qc/9804052 | Joan Masso | Carles Bona, Joan Masso, Edward Seidel and Paul Walker | Three Dimensional Numerical Relativity with a Hyperbolic Formulation | Corrected a wrong reference, added two, fixed notation and changed a
figure. 35 double column pages including 41 figures. Version with higher
quality figures, movies and more available at
http://cactus.aei-potsdam.mpg.de | null | null | null | gr-qc | null | We discuss a successful three-dimensional cartesian implementation of the
Bona-Mass\'o hyperbolic formulation of the 3+1 Einstein evolution equations in
numerical relativity. The numerical code, which we call ``Cactus,'' provides a
general framework for 3D numerical relativity, and can include various
formulations of... | [
{
"created": "Wed, 22 Apr 1998 10:24:30 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Apr 1998 15:12:12 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Bona",
"Carles",
""
],
[
"Masso",
"Joan",
""
],
[
"Seidel",
"Edward",
""
],
[
"Walker",
"Paul",
""
]
] | We discuss a successful three-dimensional cartesian implementation of the Bona-Mass\'o hyperbolic formulation of the 3+1 Einstein evolution equations in numerical relativity. The numerical code, which we call ``Cactus,'' provides a general framework for 3D numerical relativity, and can include various formulations of t... |
gr-qc/9901018 | Jiri Podolsky | J. Bicak, J. Podolsky | Global structure of Robinson-Trautman radiative space-times with
cosmological constant | 17 pages, 10 figures | Phys.Rev. D55 (1997) 1985-1993 | 10.1103/PhysRevD.55.1985 | KTF MFF UK JBJP2 | gr-qc | null | Robinson-Trautman radiative space-times of Petrov type II with a
non-vanishing cosmological constant Lambda and mass parameter m>0 are studied
using analytical methods. They are shown to approach the corresponding
spherically symmetric Schwarzschild-de Sitter or Schwarzschild-anti-de Sitter
solution at large retarded... | [
{
"created": "Thu, 7 Jan 1999 16:24:09 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Bicak",
"J.",
""
],
[
"Podolsky",
"J.",
""
]
] | Robinson-Trautman radiative space-times of Petrov type II with a non-vanishing cosmological constant Lambda and mass parameter m>0 are studied using analytical methods. They are shown to approach the corresponding spherically symmetric Schwarzschild-de Sitter or Schwarzschild-anti-de Sitter solution at large retarded t... |
1010.1271 | Andrew J. S. Hamilton | Andrew J. S. Hamilton (JILA) | The interior structure of rotating black holes 2. Uncharged black holes | Version 1: 30 pages, 1 figure. Version 2: Extensively revised, logic
tightened, derivation more elegant. 37 pages, 1 figure. Version 3: Minor
revisions to match published version. Mathematica notebook available at
http://jila.colorado.edu/~ajsh/rotatinginflationary/rotatinginflationary.nb | Phys. Rev. D 84, 124056 (2011) | 10.1103/PhysRevD.84.124056 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | (Abridged) A solution is obtained for the interior structure of an uncharged
rotating black hole that accretes a collisionless fluid. The solution is
conformally stationary, axisymmetric, and conformally separable, possessing a
conformal Killing tensor. Hyper-relativistic counter-streaming between
collisionless ingoi... | [
{
"created": "Sun, 3 Oct 2010 18:20:40 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jan 2011 00:29:24 GMT",
"version": "v2"
},
{
"created": "Fri, 13 Jan 2012 01:04:21 GMT",
"version": "v3"
}
] | 2012-01-16 | [
[
"Hamilton",
"Andrew J. S.",
"",
"JILA"
]
] | (Abridged) A solution is obtained for the interior structure of an uncharged rotating black hole that accretes a collisionless fluid. The solution is conformally stationary, axisymmetric, and conformally separable, possessing a conformal Killing tensor. Hyper-relativistic counter-streaming between collisionless ingoing... |
1207.2323 | Rakesh Tibrewala | Rakesh Tibrewala | Modified constraint algebra in loop quantum gravity and spacetime
interpretation | Prepared for ICGC2011, Goa (India) proceedings | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Classically the constraint algebra of general relativity, which generates
gauge transformations, is equivalent to spacetime covariance. In LQG, inverse
triad corrections lead to an effective Hamiltonian constraint which can lead to
a modified constraint algebra. We show, using example of spherically symmetric
spaceti... | [
{
"created": "Tue, 10 Jul 2012 12:16:51 GMT",
"version": "v1"
}
] | 2012-07-11 | [
[
"Tibrewala",
"Rakesh",
""
]
] | Classically the constraint algebra of general relativity, which generates gauge transformations, is equivalent to spacetime covariance. In LQG, inverse triad corrections lead to an effective Hamiltonian constraint which can lead to a modified constraint algebra. We show, using example of spherically symmetric spacetime... |
1508.06178 | Sergio Zerbini | Aimeric Coll\'eaux and Sergio Zerbini | Modified Gravity Models Admitting Second Order Equations of Motion | 16 pages, minor modifications, published version | null | 10.3390/e17106643 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The aim of this paper is to find higher order geometrical corrections to the
Einstein-Hilbert action that can lead to only second order equations of motion.
The metric formalism is used, and static spherically symmetric and
Friedmann-Lema\^itre space-times are considered, in four dimensions. The
FKWC-basis are introd... | [
{
"created": "Tue, 25 Aug 2015 14:59:40 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Sep 2015 11:37:23 GMT",
"version": "v2"
}
] | 2015-10-28 | [
[
"Colléaux",
"Aimeric",
""
],
[
"Zerbini",
"Sergio",
""
]
] | The aim of this paper is to find higher order geometrical corrections to the Einstein-Hilbert action that can lead to only second order equations of motion. The metric formalism is used, and static spherically symmetric and Friedmann-Lema\^itre space-times are considered, in four dimensions. The FKWC-basis are introduc... |
2209.05365 | Albert Munyeshyaka Mr | Albert Munyeshyaka, Abraham Ayirwanda, Fidele Twagirayezu, and Joseph
Ntahompagaze | Multifluid cosmology in f (G) gravity | 45 pages, 4 figures | IJGMMP, 2022 | 10.1142/S0219887823500317 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | The treatment of 1 + 3 covariant perturbation in a multifluid cosmology with
the consideration of f (G) gravity, G being the Gauss-Bonnet term, is done in
the present paper. We define a set of covariant and gauge-invariant variables
to describe density, velocity and entropy perturbations for both the total
matter and... | [
{
"created": "Mon, 12 Sep 2022 16:17:59 GMT",
"version": "v1"
}
] | 2023-02-22 | [
[
"Munyeshyaka",
"Albert",
""
],
[
"Ayirwanda",
"Abraham",
""
],
[
"Twagirayezu",
"Fidele",
""
],
[
"Ntahompagaze",
"Joseph",
""
]
] | The treatment of 1 + 3 covariant perturbation in a multifluid cosmology with the consideration of f (G) gravity, G being the Gauss-Bonnet term, is done in the present paper. We define a set of covariant and gauge-invariant variables to describe density, velocity and entropy perturbations for both the total matter and c... |
1801.08161 | Adam Chudecki Dr | Adam Chudecki, Maciej Przanowski | On twisting type $[\textrm{N}] \otimes [\textrm{N}]$ Ricci flat complex
spacetimes with two homothetic symmetries | null | Journal of Mathematical Physics 59, 042504 (2018) | 10.1063/1.5026374 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | $\mathcal{HH}$ spaces of type $[\textrm{N}] \otimes [\textrm{N}]$ with
twisting congruence of null geodesics defined by the 4-fold undotted and dotted
Penrose spinors are investigated. It is assumed that these spaces admit two
homothetic symmetries. The general form of the homothetic vector fields are
found. New coor... | [
{
"created": "Wed, 24 Jan 2018 19:41:57 GMT",
"version": "v1"
}
] | 2018-04-26 | [
[
"Chudecki",
"Adam",
""
],
[
"Przanowski",
"Maciej",
""
]
] | $\mathcal{HH}$ spaces of type $[\textrm{N}] \otimes [\textrm{N}]$ with twisting congruence of null geodesics defined by the 4-fold undotted and dotted Penrose spinors are investigated. It is assumed that these spaces admit two homothetic symmetries. The general form of the homothetic vector fields are found. New coordi... |
1605.07450 | Vasiliy P. Neznamov | V.P. Neznamov, I.I. Safronov | The effective method to calculate eigenvalues of Chandrasekhar-Page
angular equations | 10 pages, 2 figures, accepted for publication in International
Journal of Modern Physics D | International Journal of Modern Physica D Vol. 25, No. 10 (2016)
1650091 | 10.1142/S0218271816500917 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An effective, reliable and time saving numerical method with using of the
Pruefer transformation is proposed to calculate eigenvalues of
Chandrasekhar-Page angular equations.
| [
{
"created": "Mon, 23 May 2016 04:02:18 GMT",
"version": "v1"
}
] | 2017-06-07 | [
[
"Neznamov",
"V. P.",
""
],
[
"Safronov",
"I. I.",
""
]
] | An effective, reliable and time saving numerical method with using of the Pruefer transformation is proposed to calculate eigenvalues of Chandrasekhar-Page angular equations. |
1603.07326 | S. I. Kruglov | S.I. Kruglov | Acceleration of Universe by Nonlinear Electromagnetic Fields | 19 pages, 7 figures | null | 10.1142/S0218271816400022 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new model of nonlinear electromagnetic fields possessing a dimensional
parameter $\beta$ is proposed. Electromagnetic fields are considered as the
source of the gravitation field and accelerated expansion of the universe is
driven by nonlinear electromagnetic fields. We consider the magnetic universe
and the stocha... | [
{
"created": "Tue, 22 Mar 2016 22:39:55 GMT",
"version": "v1"
}
] | 2016-03-25 | [
[
"Kruglov",
"S. I.",
""
]
] | A new model of nonlinear electromagnetic fields possessing a dimensional parameter $\beta$ is proposed. Electromagnetic fields are considered as the source of the gravitation field and accelerated expansion of the universe is driven by nonlinear electromagnetic fields. We consider the magnetic universe and the stochast... |
2106.09593 | Jishnu Suresh | Jishnu Suresh, Deepali Agarwal, Sanjit Mitra | Jointly setting upper limits on multiple components of an anisotropic
stochastic gravitational-wave background | 14 pages, 10 figures, 2 tables | Phys. Rev. D 104, 102003 (2021) | 10.1103/PhysRevD.104.102003 | LIGO-P2100169 | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With the increasing sensitivities of the gravitational wave (GW) detectors
and more detectors joining the international network, the chances of detection
of a stochastic GW background (SGWB) are progressively increasing. Different
astrophysical and cosmological processes are likely to give rise to backgrounds
with di... | [
{
"created": "Thu, 17 Jun 2021 15:21:37 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Nov 2021 12:02:57 GMT",
"version": "v2"
},
{
"created": "Tue, 4 Jul 2023 13:38:08 GMT",
"version": "v3"
}
] | 2023-07-06 | [
[
"Suresh",
"Jishnu",
""
],
[
"Agarwal",
"Deepali",
""
],
[
"Mitra",
"Sanjit",
""
]
] | With the increasing sensitivities of the gravitational wave (GW) detectors and more detectors joining the international network, the chances of detection of a stochastic GW background (SGWB) are progressively increasing. Different astrophysical and cosmological processes are likely to give rise to backgrounds with dist... |
gr-qc/9806093 | George Emanuel Avraam Matsas | Atsushi Higuchi, George E.A. Matsas and Daniel Sudarsky | Interaction of Hawking radiation with static sources outside a
Schwarzschild black hole | 18 pages (REVTEX) | Phys. Rev. D 58, 104021 (1998) | 10.1103/PhysRevD.58.104021 | IFT-P.043/98 | gr-qc | null | We show that the response rate of (i) a static source interacting with
Hawking radiation of massless scalar field in Schwarzschild spacetime (with the
Unruh vacuum) and that of (ii) a uniformly accelerated source with the same
proper acceleration in Minkowski spacetime (with the Minkowski vacuum) are
equal. We show t... | [
{
"created": "Wed, 24 Jun 1998 12:31:11 GMT",
"version": "v1"
}
] | 2016-08-25 | [
[
"Higuchi",
"Atsushi",
""
],
[
"Matsas",
"George E. A.",
""
],
[
"Sudarsky",
"Daniel",
""
]
] | We show that the response rate of (i) a static source interacting with Hawking radiation of massless scalar field in Schwarzschild spacetime (with the Unruh vacuum) and that of (ii) a uniformly accelerated source with the same proper acceleration in Minkowski spacetime (with the Minkowski vacuum) are equal. We show tha... |
2002.04875 | Rocco D'Agostino | Salvatore Capozziello, Rocco D'Agostino, Daniele Gregoris | Black holes and naked singularities from Anton-Schmidt's fluids | 6 pages, no figures | null | null | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Adopting the Tolman-Oppenheimer-Volkoff formalism, we propose a new
analytical solution for a static and spherically symmetric black hole where the
cosmological constant is generalized to a non-isotropic Anton-Schmidt fluid
acting as a unified dark energy - dark matter source. Our novel result can
describe a black ho... | [
{
"created": "Wed, 12 Feb 2020 09:51:06 GMT",
"version": "v1"
}
] | 2020-02-13 | [
[
"Capozziello",
"Salvatore",
""
],
[
"D'Agostino",
"Rocco",
""
],
[
"Gregoris",
"Daniele",
""
]
] | Adopting the Tolman-Oppenheimer-Volkoff formalism, we propose a new analytical solution for a static and spherically symmetric black hole where the cosmological constant is generalized to a non-isotropic Anton-Schmidt fluid acting as a unified dark energy - dark matter source. Our novel result can describe a black hole... |
2208.14770 | Phuwadon Chunaksorn | Phuwadon Chunaksorn, Ekapong Hirunsirisawat, Ratchaphat Nakarachinda,
Lunchakorn Tannukij and Pitayuth Wongjun | Thermodynamics of Asymptotically de-Sitter Black Hole in dRGT Massive
Gravity from R\'{e}nyi entropy | 37 pages, 13 figures, V.2 There had been added on the references, and
the typos had been corrected | Eur. Phys. J. C 82, 1174 (2022) | 10.1140/epjc/s10052-022-11110-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The thermodynamic properties of the de Rham-Gabadadze-Tolley (dRGT) black
hole in the asymptotically de Sitter (dS) spacetime are investigated by using
R\'enyi entropy. It has been found that the black hole with asymptotically dS
spacetime described by the standard Gibbs-Boltzmann statistics cannot be
thermodynamical... | [
{
"created": "Wed, 31 Aug 2022 10:59:45 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Sep 2022 09:24:14 GMT",
"version": "v2"
}
] | 2023-03-21 | [
[
"Chunaksorn",
"Phuwadon",
""
],
[
"Hirunsirisawat",
"Ekapong",
""
],
[
"Nakarachinda",
"Ratchaphat",
""
],
[
"Tannukij",
"Lunchakorn",
""
],
[
"Wongjun",
"Pitayuth",
""
]
] | The thermodynamic properties of the de Rham-Gabadadze-Tolley (dRGT) black hole in the asymptotically de Sitter (dS) spacetime are investigated by using R\'enyi entropy. It has been found that the black hole with asymptotically dS spacetime described by the standard Gibbs-Boltzmann statistics cannot be thermodynamically... |
0905.4142 | Valentin Kuzmichev | V. E. Kuzmichev, V. V. Kuzmichev (Bogolyubov Institute for Theoretical
Physics) | Semi-classical Universe Near Initial Singularity | 14 pages, 1 EPS figure | Acta Phys.Polon.B40:2877-2891,2009 | null | null | gr-qc astro-ph.CO quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The properties of the quantum universe on extremely small spacetime scales
are studied in the semi-classical approach to the well-defined quantum model.
It is shown that near the initial cosmological singularity point quantum
gravity effects ~ h exhibit themselves in the form of additional matter source
with the nega... | [
{
"created": "Tue, 26 May 2009 09:09:17 GMT",
"version": "v1"
}
] | 2010-04-30 | [
[
"Kuzmichev",
"V. E.",
"",
"Bogolyubov Institute for Theoretical\n Physics"
],
[
"Kuzmichev",
"V. V.",
"",
"Bogolyubov Institute for Theoretical\n Physics"
]
] | The properties of the quantum universe on extremely small spacetime scales are studied in the semi-classical approach to the well-defined quantum model. It is shown that near the initial cosmological singularity point quantum gravity effects ~ h exhibit themselves in the form of additional matter source with the negati... |
1612.03783 | Lorenzo Iorio | Lorenzo Iorio | Are we close to put the anomalous perihelion precessions from Verlinde's
emergent gravity to the test? | LaTex2e, 12 pages, no figures, 2 tables. Accepted for publication in
The European Physical Journal C (EPJC) | Eur. Phys. J. C (2017) 77: 149 | 10.1140/epjc/s10052-017-4722-z | null | gr-qc astro-ph.EP hep-th physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of the emergent gravity scenario by Verlinde, it was
recently observed by Liu and Prokopec that, among other things, an anomalous
pericenter precession would affect the orbital motion of a test particle
orbiting an isolated central body. Here, it is shown that, if it were real, its
expected magnitude... | [
{
"created": "Mon, 12 Dec 2016 16:55:04 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Feb 2017 23:02:54 GMT",
"version": "v2"
}
] | 2017-03-14 | [
[
"Iorio",
"Lorenzo",
""
]
] | In the framework of the emergent gravity scenario by Verlinde, it was recently observed by Liu and Prokopec that, among other things, an anomalous pericenter precession would affect the orbital motion of a test particle orbiting an isolated central body. Here, it is shown that, if it were real, its expected magnitude f... |
gr-qc/0103050 | PF Kelly | Charro Gruver, Richard Hammond, P. F. Kelly | Tensor-Scalar Torsion | 10 pages, LaTeX, Mod. Phys. Lett. A accepted | Mod.Phys.Lett. A16 (2001) 113-120 | 10.1142/S0217732301003140 | null | gr-qc | null | A theory of gravity with torsion is examined in which the torsion tensor is
constructed from the exterior derivative of an antisymmetric rank two potential
plus the dual of the gradient of a scalar field. Field equations for the theory
are derived by demanding that the action be stationary under variations with
respe... | [
{
"created": "Wed, 14 Mar 2001 21:46:20 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Gruver",
"Charro",
""
],
[
"Hammond",
"Richard",
""
],
[
"Kelly",
"P. F.",
""
]
] | A theory of gravity with torsion is examined in which the torsion tensor is constructed from the exterior derivative of an antisymmetric rank two potential plus the dual of the gradient of a scalar field. Field equations for the theory are derived by demanding that the action be stationary under variations with respect... |
0710.1022 | Lorenzo Iorio | Lorenzo Iorio | Conservative evaluation of the uncertainty in the LAGEOS-LAGEOS II
Lense-Thirring test | LaTex, 12 pages, 12 tables, no figures, 64 references. To appear in
Central European Journal of Physics (CEJP) | Centr. Eur. J. Phys. 8(1), 25-32, 2010 | 10.2478/s11534-009-0060-6 | null | gr-qc astro-ph physics.geo-ph physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We deal with the test of the general relativistic gravitomagnetic
Lense-Thirring effect currently ongoing in the Earth's gravitational field with
the combined nodes \Omega of the laser-ranged geodetic satellites LAGEOS and
LAGEOS II.
One of the most important source of systematic uncertainty on the orbits of
the LA... | [
{
"created": "Thu, 4 Oct 2007 14:21:37 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Oct 2007 20:39:08 GMT",
"version": "v2"
},
{
"created": "Sun, 4 Nov 2007 12:57:42 GMT",
"version": "v3"
},
{
"created": "Wed, 28 Nov 2007 17:08:01 GMT",
"version": "v4"
},
{
"cre... | 2009-11-06 | [
[
"Iorio",
"Lorenzo",
""
]
] | We deal with the test of the general relativistic gravitomagnetic Lense-Thirring effect currently ongoing in the Earth's gravitational field with the combined nodes \Omega of the laser-ranged geodetic satellites LAGEOS and LAGEOS II. One of the most important source of systematic uncertainty on the orbits of the LAGEOS... |
1505.02373 | Behnam Pourhassan | Mir Faizal and Behnam Pourhassan | Corrections Terms for the Thermodynamics of a Black Saturn | 15 pages, revised version has been accepted for publication in Phys.
Lett. B | Phys. Lett. B 751 (2015) 487 | 10.1016/j.physletb.2015.10.077 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we will analyze the effects of thermal fluctuations on the
stability of a black Saturn. The entropy of the black Saturn will get corrected
due to these thermal fluctuations. We will demonstrate that the correction term
generated by these thermal fluctuations is a logarithmic term. Then we will use
this... | [
{
"created": "Sun, 10 May 2015 12:01:58 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Oct 2015 06:32:31 GMT",
"version": "v2"
}
] | 2015-12-01 | [
[
"Faizal",
"Mir",
""
],
[
"Pourhassan",
"Behnam",
""
]
] | In this paper, we will analyze the effects of thermal fluctuations on the stability of a black Saturn. The entropy of the black Saturn will get corrected due to these thermal fluctuations. We will demonstrate that the correction term generated by these thermal fluctuations is a logarithmic term. Then we will use this c... |
gr-qc/0612147 | David P. Rideout | J. Brunnemann and D. Rideout | Spectral Analysis of the Volume Operator in Loop Quantum Gravity | 5 pages, 1 figure. Talk given by D. Rideout at the Eleventh Marcel
Grossmann Meeting on General Relativity at the Freie U. Berlin, July 23 - 29,
2006 | null | 10.1088/0264-9381/23/4/014 | Imperial/TP/2006/DR/02 | gr-qc | null | We describe preliminary results of a detailed numerical analysis of the
volume operator as formulated by Ashtekar and Lewandowski. Due to a simplified
explicit expression for its matrix elements, it is possible for the first time
to treat generic vertices of valence greater than four. It is found that the
vertex geom... | [
{
"created": "Fri, 22 Dec 2006 18:38:11 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Brunnemann",
"J.",
""
],
[
"Rideout",
"D.",
""
]
] | We describe preliminary results of a detailed numerical analysis of the volume operator as formulated by Ashtekar and Lewandowski. Due to a simplified explicit expression for its matrix elements, it is possible for the first time to treat generic vertices of valence greater than four. It is found that the vertex geomet... |
2105.11458 | Aaron Held | Aaron Held | Invariant Renormalization-Group improvement | 16 pages + appedix (6 pages) and references; 1 figure | null | null | Imperial/TP/2021/AH/04 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Renormalization-Group (RG) improvement has been frequently applied to capture
the effect of quantum corrections on cosmological and black-hole spacetimes.
This work utilizes an algebraically complete set of curvature invariants to
establish that: On the one hand, RG improvement at the level of the metric is
coordinat... | [
{
"created": "Mon, 24 May 2021 18:00:01 GMT",
"version": "v1"
}
] | 2021-05-26 | [
[
"Held",
"Aaron",
""
]
] | Renormalization-Group (RG) improvement has been frequently applied to capture the effect of quantum corrections on cosmological and black-hole spacetimes. This work utilizes an algebraically complete set of curvature invariants to establish that: On the one hand, RG improvement at the level of the metric is coordinate-... |
1803.09241 | Adam Szereszewski | Jerzy Lewandowski, Adam Szereszewski | The axial symmetry of Kerr without the rigidity theorem | null | Phys. Rev. D 97, 124067 (2018) | 10.1103/PhysRevD.97.124067 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Local condition that imply the no-hair property of black holes are completed.
The conditions take the form of constraints on the geometry of the
2-dimensional crossover surface of black hole horizon. They imply also the
axial symmetry without the rigidity theorem. This is the new result contained
in this letter. The ... | [
{
"created": "Sun, 25 Mar 2018 12:30:47 GMT",
"version": "v1"
}
] | 2018-07-04 | [
[
"Lewandowski",
"Jerzy",
""
],
[
"Szereszewski",
"Adam",
""
]
] | Local condition that imply the no-hair property of black holes are completed. The conditions take the form of constraints on the geometry of the 2-dimensional crossover surface of black hole horizon. They imply also the axial symmetry without the rigidity theorem. This is the new result contained in this letter. The fa... |
0706.3050 | T. R. Mongan | T. R. Mongan | Dark matter from "strong gravity" - consistent with CRESST, CoGeNT and
DAMA/LIBRA | Updated to show consistency of dark matter candidate with CRESST,
CoGeNT and DAMA/LIBRA results | null | null | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Kelso, Hooper and Buckley [arXiv:1110.5338] found CRESST, CoGeNT and
DAMA/LIBRA results are consistent with 10 - 15 GeV dark matter particles.
Hennawi and Ostriker [arXiv:astro-ph/0108203] analyzed supermassive black hole
formation in the centers of galaxies, finding a best fit for dark matter
(self-interaction cross... | [
{
"created": "Wed, 20 Jun 2007 20:01:57 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Nov 2009 21:19:57 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Dec 2011 21:01:08 GMT",
"version": "v3"
}
] | 2011-12-16 | [
[
"Mongan",
"T. R.",
""
]
] | Kelso, Hooper and Buckley [arXiv:1110.5338] found CRESST, CoGeNT and DAMA/LIBRA results are consistent with 10 - 15 GeV dark matter particles. Hennawi and Ostriker [arXiv:astro-ph/0108203] analyzed supermassive black hole formation in the centers of galaxies, finding a best fit for dark matter (self-interaction cross-s... |
2008.03331 | Francisco Diego Mazzitelli | Ezequiel Lozano and Francisco D. Mazzitelli | The role of noise in the early universe | 11 pages, no figures. Presentation improved. References added.
Published in IJMPD | null | 10.1142/S0218271821501170 10.1142/S0218271821501170 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a quantum mechanical system to model the effect of quantum fields
on the evolution of the early universe. The system consists of an inverted
oscillator bilinearly coupled to a set of harmonic oscillators. We point out
that the role of noise may be crucial in the dynamics of the oscillator, which
is analyz... | [
{
"created": "Fri, 7 Aug 2020 18:30:33 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Oct 2021 19:19:43 GMT",
"version": "v2"
}
] | 2021-10-26 | [
[
"Lozano",
"Ezequiel",
""
],
[
"Mazzitelli",
"Francisco D.",
""
]
] | We consider a quantum mechanical system to model the effect of quantum fields on the evolution of the early universe. The system consists of an inverted oscillator bilinearly coupled to a set of harmonic oscillators. We point out that the role of noise may be crucial in the dynamics of the oscillator, which is analyzed... |
1209.0428 | Mojtaba Taslimi Tehrani | Mojtaba Taslimi Tehran and Hoshang Heydari | Quantization of Reissner-Nordstr\"{o}m Black Holes and Their
Non-Singular Quantum Behavior | To be published in the proceeding of Quantum Theory: Reconsideration
of Foundations-6 (QTRF-6) | null | 10.1063/1.4773172 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantization of different regions of the Reissner-Nordstr\"{o}m space time
(charged black hole) is done in the framework of loop quantum gravity. The
geometry of Reissner-Nordstr\"{o}m space-time is expressed in terms of Ashtekar
variables which form the classical phase space of such a black hole. Using the
loop quan... | [
{
"created": "Mon, 3 Sep 2012 18:46:46 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Tehran",
"Mojtaba Taslimi",
""
],
[
"Heydari",
"Hoshang",
""
]
] | Quantization of different regions of the Reissner-Nordstr\"{o}m space time (charged black hole) is done in the framework of loop quantum gravity. The geometry of Reissner-Nordstr\"{o}m space-time is expressed in terms of Ashtekar variables which form the classical phase space of such a black hole. Using the loop quanti... |
gr-qc/0502091 | Hakan Andreasson | Hakan Andreasson | The Einstein-Vlasov system/Kinetic theory | 40 pages, updated version, to appear in Living Reviews in Relativity | Living Rev. Rel.8:2,2005 | 10.12942/lrr-2005-2 | null | gr-qc | null | The main purpose of this article is to provide a guide to theorems on global
properties of solutions to the Einstein-Vlasov system. This system couples
Einstein's equations to a kinetic matter model. Kinetic theory has been an
important field of research during several decades in which the main focus has
been on nonr... | [
{
"created": "Tue, 22 Feb 2005 13:06:34 GMT",
"version": "v1"
}
] | 2016-10-19 | [
[
"Andreasson",
"Hakan",
""
]
] | The main purpose of this article is to provide a guide to theorems on global properties of solutions to the Einstein-Vlasov system. This system couples Einstein's equations to a kinetic matter model. Kinetic theory has been an important field of research during several decades in which the main focus has been on nonrel... |
0907.5265 | Vladimir Dzhunushaliev | V. Dzhunushaliev, K. Myrzakulov and R.Myrzakulov | Decelaration/acceleration phases with the Higgs field | 4 pages, 3 fig's | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that the Einstein gravity + Higgs scalar field have cosmological
regular solutions with deceleration/acceleration phases and with bouncing off
from a singularity. The behavior of the solution near to a flex point is in
detail considered.
| [
{
"created": "Thu, 30 Jul 2009 06:46:03 GMT",
"version": "v1"
}
] | 2009-07-31 | [
[
"Dzhunushaliev",
"V.",
""
],
[
"Myrzakulov",
"K.",
""
],
[
"Myrzakulov",
"R.",
""
]
] | It is shown that the Einstein gravity + Higgs scalar field have cosmological regular solutions with deceleration/acceleration phases and with bouncing off from a singularity. The behavior of the solution near to a flex point is in detail considered. |
1301.6833 | Yun-Song Piao | Zhi-Guo Liu, Yun-Song Piao | Galilean Islands in Eternally Inflating Background | 8 pages, 4 figs, refs added, figs and discussions improved, to
publish in PRD | null | 10.1103/PhysRevD.88.043520 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the observational universe may emerge classically from a de
Sitter background with low energy scale. We find, after calculating the
curvature perturbation, that the resulting scenario is actually a style of the
eternal inflation scenario, in which some regions will go through the slowly
expanding Galilea... | [
{
"created": "Tue, 29 Jan 2013 05:31:09 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Aug 2013 06:50:51 GMT",
"version": "v2"
}
] | 2013-08-28 | [
[
"Liu",
"Zhi-Guo",
""
],
[
"Piao",
"Yun-Song",
""
]
] | We show that the observational universe may emerge classically from a de Sitter background with low energy scale. We find, after calculating the curvature perturbation, that the resulting scenario is actually a style of the eternal inflation scenario, in which some regions will go through the slowly expanding Galilean ... |
0902.1287 | Scott Field | Scott E. Field (1), Jan S. Hesthaven (1), Stephen R. Lau (1 and 2)
((1) Brown, (2) New Mexico) | Discontinuous Galerkin method for computing gravitational waveforms from
extreme mass ratio binaries | Revised in response to referees' reports. Several minus sign errors
corrected, and improved tables. Uses revtex4, 27 pages, 6 figures, 3 tables | Class.Quant.Grav.26:165010,2009 | 10.1088/0264-9381/26/16/165010 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational wave emission from extreme mass ratio binaries (EMRBs) should
be detectable by the joint NASA-ESA LISA project, spurring interest in
analytical and numerical methods for investigating EMRBs. We describe a
discontinuous Galerkin (dG) method for solving the distributionally forced 1+1
wave equations which... | [
{
"created": "Sun, 8 Feb 2009 21:36:02 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Aug 2009 03:11:13 GMT",
"version": "v2"
}
] | 2009-11-19 | [
[
"Field",
"Scott E.",
"",
"Brown"
],
[
"Hesthaven",
"Jan S.",
"",
"Brown"
],
[
"Lau",
"Stephen R.",
"",
"1 and 2"
]
] | Gravitational wave emission from extreme mass ratio binaries (EMRBs) should be detectable by the joint NASA-ESA LISA project, spurring interest in analytical and numerical methods for investigating EMRBs. We describe a discontinuous Galerkin (dG) method for solving the distributionally forced 1+1 wave equations which a... |
2405.08195 | Sumanto Chanda | Sumanto Chanda | Zermelo Wind: a geometrization of the frame dragging effect | 10 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article I discuss Zermelo's navigation problem in spacetime as a
geometrization of the frame dragging effect, and recast various examples
involving the latter into Zermelo form. I start by describing a stationary
spacetime in Zermelo's form and show that the Zermelo wind is the drift
velocity under frame drag... | [
{
"created": "Mon, 13 May 2024 21:21:18 GMT",
"version": "v1"
}
] | 2024-05-15 | [
[
"Chanda",
"Sumanto",
""
]
] | In this article I discuss Zermelo's navigation problem in spacetime as a geometrization of the frame dragging effect, and recast various examples involving the latter into Zermelo form. I start by describing a stationary spacetime in Zermelo's form and show that the Zermelo wind is the drift velocity under frame draggi... |
1409.1410 | Neda Farhangkhah | N. Farhangkhah, M. H. Dehghani | Lovelock black holes with nonmaximally symmetric horizons | 16 pages, 3 figures | Phys. Rev. D 90, 044014 (2014) | 10.1103/PhysRevD.90.044014 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new class of black hole solutions in third-order Lovelock
gravity whose horizons are Einstein space with two supplementary conditions on
their Weyl tensors. These solutions are obtained with the advantage of higher
curvature terms appearing in Lovelock gravity. We find that while the solution
of third-or... | [
{
"created": "Thu, 4 Sep 2014 11:52:09 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Farhangkhah",
"N.",
""
],
[
"Dehghani",
"M. H.",
""
]
] | We present a new class of black hole solutions in third-order Lovelock gravity whose horizons are Einstein space with two supplementary conditions on their Weyl tensors. These solutions are obtained with the advantage of higher curvature terms appearing in Lovelock gravity. We find that while the solution of third-orde... |
1511.07461 | Gerardo Vel\'azquez-Rodr\'iguez | Eloy Ay\'on-Beato, Gerardo Vel\'azquez-Rodr\'iguez | On the Residual Symmetries of the Gravitational Field | Affiliations have been updated | Phys. Rev. D 93, 044040 (2016) | 10.1103/PhysRevD.93.044040 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a geometric criterion that unambiguously characterizes and also
provides a systematic and effective computational procedure for finding all the
residual symmetries of any gravitational Ansatz . We apply the criterion to
several examples starting with the Collinson Ansatz for circular stationary
axisymmetri... | [
{
"created": "Mon, 23 Nov 2015 21:10:40 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Dec 2015 03:53:44 GMT",
"version": "v2"
},
{
"created": "Sun, 6 Dec 2015 21:25:31 GMT",
"version": "v3"
},
{
"created": "Thu, 11 Feb 2016 05:50:02 GMT",
"version": "v4"
},
{
"cre... | 2017-07-27 | [
[
"Ayón-Beato",
"Eloy",
""
],
[
"Velázquez-Rodríguez",
"Gerardo",
""
]
] | We develop a geometric criterion that unambiguously characterizes and also provides a systematic and effective computational procedure for finding all the residual symmetries of any gravitational Ansatz . We apply the criterion to several examples starting with the Collinson Ansatz for circular stationary axisymmetric ... |
2210.03149 | Andrea Calcinari | Andrea Calcinari and Steffen Gielen | Towards anisotropic cosmology in group field theory | 40 pages, 14 figures | Class. Quant. Grav. 40 (2023) 085004 | 10.1088/1361-6382/acc1db | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In cosmological group field theory (GFT) models for quantum gravity coupled
to a massless scalar field the total volume, seen as a function of the scalar
field, follows the classical Friedmann dynamics of a flat
Friedmann-Lema\^itre-Robertson-Walker (FLRW) Universe at low energies while
resolving the Big Bang singula... | [
{
"created": "Thu, 6 Oct 2022 18:14:23 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Apr 2023 16:44:43 GMT",
"version": "v2"
}
] | 2023-04-25 | [
[
"Calcinari",
"Andrea",
""
],
[
"Gielen",
"Steffen",
""
]
] | In cosmological group field theory (GFT) models for quantum gravity coupled to a massless scalar field the total volume, seen as a function of the scalar field, follows the classical Friedmann dynamics of a flat Friedmann-Lema\^itre-Robertson-Walker (FLRW) Universe at low energies while resolving the Big Bang singulari... |
1506.00807 | Eva Hackmann | Eva Hackmann and Claus L\"ammerzahl | Analytical solution methods for geodesic motion | 11 pages, no figures; based on presentation at the conference "V.
Leopoldo Garc\'ia--Col\'in Mexican Meeting on Mathematical and Experimental
Physics", Mexico City, 2013 | Recent Developments on Physics in Strong Gravitational Fields, V.
Leopoldo Garcia--Colin Mexican Meeting on Mathematical and Experimental
Physics, volume 1577 of AIP Conference Proceedings, p. 78. AIP Publishing,
Meville, NY, 2014 | 10.1063/1.4861945 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The observation of the motion of particles and light near a gravitating
object is until now the only way to explore and to measure the gravitational
field. In the case of exact black hole solutions of the Einstein equations the
gravitational field is characterized by a small number of parameters which can
be read off... | [
{
"created": "Tue, 2 Jun 2015 09:28:31 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Hackmann",
"Eva",
""
],
[
"Lämmerzahl",
"Claus",
""
]
] | The observation of the motion of particles and light near a gravitating object is until now the only way to explore and to measure the gravitational field. In the case of exact black hole solutions of the Einstein equations the gravitational field is characterized by a small number of parameters which can be read off f... |
1911.11839 | Sachin Pandey | Sachin Pandey, Narayan Banerjee | Unitarity in quantum cosmology: symmetries protected and violated | 4 pages | International Journal of Geometric Methods in Modern Physics
(IJGMMP), 2021 | 10.1142/S0219887821500900 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work deals with the violation or retention of symmetries associated with
the self-adjoint extension of the Hamiltonian for homogeneous but anisotropic
Bianchi I cosmological model. This extension is required to make sure the
quantum evolution is unitary. It is found that the scale invariance is lost,
but the Noe... | [
{
"created": "Tue, 26 Nov 2019 21:25:04 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Feb 2021 11:46:00 GMT",
"version": "v2"
}
] | 2021-02-19 | [
[
"Pandey",
"Sachin",
""
],
[
"Banerjee",
"Narayan",
""
]
] | This work deals with the violation or retention of symmetries associated with the self-adjoint extension of the Hamiltonian for homogeneous but anisotropic Bianchi I cosmological model. This extension is required to make sure the quantum evolution is unitary. It is found that the scale invariance is lost, but the Noeth... |
1411.4531 | Hassan Saadi | Hassan Saadi | A Cosmological Solution to Mimetic Dark Matter | 12 pages | null | 10.1140/epjc/s10052-015-3856-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, a cosmological solution to Mimetic Dark Matter (MDM) for an
exponential potential is provided. Then, a solution for the $0-i$ perturbed
Einstein's differential equation of MDM is obtained based on an exponential
potential that satisfies inflation for some initial conditions. Another general
potential i... | [
{
"created": "Mon, 17 Nov 2014 16:23:56 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Apr 2015 12:11:02 GMT",
"version": "v2"
},
{
"created": "Mon, 24 Aug 2015 15:11:21 GMT",
"version": "v3"
},
{
"created": "Sun, 25 Oct 2015 23:38:30 GMT",
"version": "v4"
}
] | 2017-03-22 | [
[
"Saadi",
"Hassan",
""
]
] | In this paper, a cosmological solution to Mimetic Dark Matter (MDM) for an exponential potential is provided. Then, a solution for the $0-i$ perturbed Einstein's differential equation of MDM is obtained based on an exponential potential that satisfies inflation for some initial conditions. Another general potential is ... |
1003.1105 | Mauricio Bellini | Jose Edgar Madriz Aguilar (Guanajuato University), Mauricio Bellini
(IFIMAR & Mar del Plata University) | Primordial SdS universe from a 5D vacuum: scalar field fluctuations on
Schwarzschild and Hubble horizons | Final version to be published in JCAP | JCAP 1011:020,2010 | 10.1088/1475-7516/2010/11/020 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study scalar field fluctuations of the inflaton field in an early
inflationary universe on an effective 4D Schwarzschild-de Sitter (SdS) metric,
which is obtained after make a planar coordinate transformation on a 5D
Ricci-flat Schwarzschild-de Sitter (SdS) static metric. We obtain the important
result that the sp... | [
{
"created": "Thu, 4 Mar 2010 18:26:10 GMT",
"version": "v1"
},
{
"created": "Sat, 29 May 2010 01:57:54 GMT",
"version": "v2"
},
{
"created": "Tue, 26 Oct 2010 17:58:07 GMT",
"version": "v3"
},
{
"created": "Mon, 15 Nov 2010 14:22:44 GMT",
"version": "v4"
}
] | 2010-12-01 | [
[
"Aguilar",
"Jose Edgar Madriz",
"",
"Guanajuato University"
],
[
"Bellini",
"Mauricio",
"",
"IFIMAR & Mar del Plata University"
]
] | We study scalar field fluctuations of the inflaton field in an early inflationary universe on an effective 4D Schwarzschild-de Sitter (SdS) metric, which is obtained after make a planar coordinate transformation on a 5D Ricci-flat Schwarzschild-de Sitter (SdS) static metric. We obtain the important result that the spec... |
1801.08334 | Sebasti\'an Bahamonde | Sebastian Bahamonde, David Benisty, Eduardo I. Guendelman | Linear potentials in galaxy halos by Asymmetric Wormholes | Some small changes. Matches the published version in Universe | Universe 2018, 4(11), 112 | 10.3390/universe4110112 | null | gr-qc astro-ph.CO astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A spherically symmetric space-time solution for a diffusive two measures
theory is studied. An asymmetric wormhole geometry is obtained where the metric
coefficients have a linear term for galactic distances and the analysis of
Mannheim and collaborators, can then be used to describe the galactic rotation
curves. For... | [
{
"created": "Thu, 25 Jan 2018 10:12:55 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Oct 2018 15:46:08 GMT",
"version": "v2"
}
] | 2018-10-31 | [
[
"Bahamonde",
"Sebastian",
""
],
[
"Benisty",
"David",
""
],
[
"Guendelman",
"Eduardo I.",
""
]
] | A spherically symmetric space-time solution for a diffusive two measures theory is studied. An asymmetric wormhole geometry is obtained where the metric coefficients have a linear term for galactic distances and the analysis of Mannheim and collaborators, can then be used to describe the galactic rotation curves. For c... |
gr-qc/0202042 | Sergio M. C. V. Goncalves | Sergio M. C. V. Goncalves (Yale) | Absence of trapped surfaces and singularities in cylindrical collapse | 26 pages, revtex4, 1 eps figure; matches version to appear in Phys.
Rev. D (in press) | Phys.Rev. D65 (2002) 084045 | 10.1103/PhysRevD.65.084045 | null | gr-qc | null | The gravitational collapse of an infinite cylindrical thin shell of generic
matter in an otherwise empty spacetime is considered. We show that geometries
admitting two hypersurface orthogonal Killing vectors cannot contain trapped
surfaces in the vacuum portion of spacetime causally available to geodesic
timelike obs... | [
{
"created": "Tue, 12 Feb 2002 14:51:49 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Mar 2002 15:14:18 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Goncalves",
"Sergio M. C. V.",
"",
"Yale"
]
] | The gravitational collapse of an infinite cylindrical thin shell of generic matter in an otherwise empty spacetime is considered. We show that geometries admitting two hypersurface orthogonal Killing vectors cannot contain trapped surfaces in the vacuum portion of spacetime causally available to geodesic timelike obser... |
2403.14167 | Shao-Wen Wei | Shan-Ping Wu, Shao-Wen Wei | Thermodynamical Topology of Quantum BTZ Black Hole | 16 pages, 13 figures | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Among the study of black hole thermodynamics, topology offers a novel
approach and perspective for classifying black hole systems. In this work, we
explore the thermodynamical topology of the quantum BTZ black hole by employing
the concept of the generalized free energy. To fully characterize the
thermodynamics, we i... | [
{
"created": "Thu, 21 Mar 2024 06:42:26 GMT",
"version": "v1"
}
] | 2024-03-22 | [
[
"Wu",
"Shan-Ping",
""
],
[
"Wei",
"Shao-Wen",
""
]
] | Among the study of black hole thermodynamics, topology offers a novel approach and perspective for classifying black hole systems. In this work, we explore the thermodynamical topology of the quantum BTZ black hole by employing the concept of the generalized free energy. To fully characterize the thermodynamics, we int... |
2310.04650 | Chi Zhang | Chi Zhang and Fu-Wen Shu | Gravity-induced entanglement between two massive microscopic particles
in curved spacetime: II.Friedmann- Lema\^itre-Robertson-Walker universe | arXiv admin note: text overlap with arXiv:2308.16526 | Eur. Phys. J. C 84, 500 (2024) | 10.1140/epjc/s10052-024-12831-5 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | In our previous work, we have explored quantum gravity induced entanglement
of mass (QGEM) in curved spacetime, observing entanglement formation between
particles moving along geodesics in a Schwarzschild spacetime background. We
find that long interaction time induces entanglement, even for particles with
microscopi... | [
{
"created": "Sat, 7 Oct 2023 02:10:53 GMT",
"version": "v1"
},
{
"created": "Sat, 18 May 2024 09:49:18 GMT",
"version": "v2"
}
] | 2024-05-21 | [
[
"Zhang",
"Chi",
""
],
[
"Shu",
"Fu-Wen",
""
]
] | In our previous work, we have explored quantum gravity induced entanglement of mass (QGEM) in curved spacetime, observing entanglement formation between particles moving along geodesics in a Schwarzschild spacetime background. We find that long interaction time induces entanglement, even for particles with microscopic ... |
gr-qc/9807029 | Mark A. Scheel | Mark A. Scheel (1), Thomas W. Baumgarte (2), Gregory B. Cook (1),
Stuart L. Shapiro (2), and Saul A. Teukolsky (1) ((1) Cornell University, (2)
University of Illinois at Urbana-Champaign) | Treating instabilities in a hyperbolic formulation of Einstein's
equations | 13 pages, 9 figures. To appear in Phys. Rev. D | Phys.Rev. D58 (1998) 044020 | 10.1103/PhysRevD.58.044020 | null | gr-qc | null | We have recently constructed a numerical code that evolves a spherically
symmetric spacetime using a hyperbolic formulation of Einstein's equations. For
the case of a Schwarzschild black hole, this code works well at early times,
but quickly becomes inaccurate on a time scale of 10-100 M, where M is the mass
of the h... | [
{
"created": "Tue, 14 Jul 1998 20:07:53 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Scheel",
"Mark A.",
""
],
[
"Baumgarte",
"Thomas W.",
""
],
[
"Cook",
"Gregory B.",
""
],
[
"Shapiro",
"Stuart L.",
""
],
[
"Teukolsky",
"Saul A.",
""
]
] | We have recently constructed a numerical code that evolves a spherically symmetric spacetime using a hyperbolic formulation of Einstein's equations. For the case of a Schwarzschild black hole, this code works well at early times, but quickly becomes inaccurate on a time scale of 10-100 M, where M is the mass of the hol... |
2107.00536 | Guo-Chin Liu | Yu-Kuang Chu, Guo-Chin Liu, and Kin-Wang Ng | Observation of polarized stochastic gravitational-wave background in
pulsar-timing-array experiments | 13 pages, 4 figures, Submitted to PRD. arXiv admin note: text overlap
with arXiv:2002.01606 | null | 10.1103/PhysRevD.104.124018 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We study the observation of polarized stochastic gravitational-wave
background (SGWB) in pulsar-timing-array experiments. The time residual for an
observed pulsar is formulated as a line-of-sight integral that incorporates the
effects of the pulsar term, from which we construct the correlation function of
the time re... | [
{
"created": "Thu, 1 Jul 2021 15:28:20 GMT",
"version": "v1"
}
] | 2021-12-15 | [
[
"Chu",
"Yu-Kuang",
""
],
[
"Liu",
"Guo-Chin",
""
],
[
"Ng",
"Kin-Wang",
""
]
] | We study the observation of polarized stochastic gravitational-wave background (SGWB) in pulsar-timing-array experiments. The time residual for an observed pulsar is formulated as a line-of-sight integral that incorporates the effects of the pulsar term, from which we construct the correlation function of the time resi... |
1010.1074 | Hao Wei | Hao Wei | Cosmological Constraints on the Sign-Changeable Interactions | 15 pages, 1 table, 8 figures, revtex4; v2: published version | Commun.Theor.Phys.56:972-980,2011 | 10.1088/0253-6102/56/5/29 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, Cai and Su [Phys. Rev. D {\bf 81}, 103514 (2010)] found that the
sign of interaction $Q$ in the dark sector changed in the approximate redshift
range of $0.45\,\lsim\, z\,\lsim\, 0.9$, by using a model-independent method to
deal with the observational data. In fact, this result raises a remarkable
problem, ... | [
{
"created": "Wed, 6 Oct 2010 07:00:00 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Nov 2011 12:56:00 GMT",
"version": "v2"
}
] | 2011-11-22 | [
[
"Wei",
"Hao",
""
]
] | Recently, Cai and Su [Phys. Rev. D {\bf 81}, 103514 (2010)] found that the sign of interaction $Q$ in the dark sector changed in the approximate redshift range of $0.45\,\lsim\, z\,\lsim\, 0.9$, by using a model-independent method to deal with the observational data. In fact, this result raises a remarkable problem, si... |
1812.10526 | Benjamin Koch | Felipe Canales, Benjamin Koch, Cristobal Laporte, Angel Rincon | Cosmological constant problem: deflation during inflation | 9 pages, 3 figures, affiliation added | null | 10.1088/1475-7516/2020/01/021 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that the discrepancy between the Planck mass scale and the observed
value of the cosmological constant can be largely attenuated if those
quantities are understood as a result of effective, and thus scale-dependent,
couplings. We exemplify this mechanism for the early inflationary epoch of the
universe by so... | [
{
"created": "Wed, 26 Dec 2018 20:16:40 GMT",
"version": "v1"
},
{
"created": "Mon, 6 May 2019 20:42:10 GMT",
"version": "v2"
},
{
"created": "Mon, 29 Jul 2019 21:42:28 GMT",
"version": "v3"
},
{
"created": "Thu, 1 Aug 2019 23:03:58 GMT",
"version": "v4"
},
{
"cre... | 2020-01-15 | [
[
"Canales",
"Felipe",
""
],
[
"Koch",
"Benjamin",
""
],
[
"Laporte",
"Cristobal",
""
],
[
"Rincon",
"Angel",
""
]
] | We argue that the discrepancy between the Planck mass scale and the observed value of the cosmological constant can be largely attenuated if those quantities are understood as a result of effective, and thus scale-dependent, couplings. We exemplify this mechanism for the early inflationary epoch of the universe by solv... |
1903.07078 | Ovidiu Cristinel Stoica | Ovidiu Cristinel Stoica | The post-determined block universe | 43 pages, based on a talk of the author at the Fifth International
Conference on the Nature and Ontology of Spacetime, 2018. Quantum Stud.:
Math. Found. (2020) | Quantum Studies: Mathematics and Foundations 8.1 (2021): 69-101 | 10.1007/s40509-020-00228-4 | null | gr-qc physics.hist-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A series of reasons to take quantum unitary evolution seriously and explain
the projection of the state vector as unitary and not discontinuous are
presented, including some from General Relativity. This leads to an
interpretation of Quantum Mechanics which is unitary at the level of a single
world. I argue that unit... | [
{
"created": "Sun, 17 Mar 2019 12:56:14 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Aug 2019 19:20:08 GMT",
"version": "v2"
},
{
"created": "Fri, 29 May 2020 05:57:08 GMT",
"version": "v3"
}
] | 2024-02-06 | [
[
"Stoica",
"Ovidiu Cristinel",
""
]
] | A series of reasons to take quantum unitary evolution seriously and explain the projection of the state vector as unitary and not discontinuous are presented, including some from General Relativity. This leads to an interpretation of Quantum Mechanics which is unitary at the level of a single world. I argue that unitar... |
1006.3168 | Lau Loi So | Lau Loi So | A simple tensorial proof for the completely symmetric property of the
Bel-Robinson tensor | 6 pages; added a new argument in section 3, results unchanged | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Bel-Robinson tensor $T_{\alpha\beta\mu\nu}$ was proposed in 1958. The
main application of this tensor is for describing gravitational energy. It is
known that $T_{\alpha\beta\mu\nu}$ has many nice properties such as being
completely symmetric. It is easy to prove this property using spinors as shown
in Penrose's ... | [
{
"created": "Wed, 16 Jun 2010 09:41:35 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Jul 2010 08:41:59 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Jul 2010 10:45:55 GMT",
"version": "v3"
},
{
"created": "Thu, 22 Jul 2010 06:53:25 GMT",
"version": "v4"
}
] | 2010-07-23 | [
[
"So",
"Lau Loi",
""
]
] | The Bel-Robinson tensor $T_{\alpha\beta\mu\nu}$ was proposed in 1958. The main application of this tensor is for describing gravitational energy. It is known that $T_{\alpha\beta\mu\nu}$ has many nice properties such as being completely symmetric. It is easy to prove this property using spinors as shown in Penrose's bo... |
0904.1826 | Gaurav Khanna | Jens Breitbart, Gaurav Khanna | An exploration of CUDA and CBEA for a gravitational wave data-analysis
application (Einstein@Home) | Accepted for publication in International Conference on Parallel
Processing and Applied Mathematics (PPAM 2009) | null | 10.2174/1874381101004010154 | null | gr-qc physics.comp-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a detailed approach for making use of two new computer hardware
architectures -- CBEA and CUDA -- for accelerating a scientific data-analysis
application (Einstein@Home). Our results suggest that both the architectures
suit the application quite well and the achievable performance in the same
software deve... | [
{
"created": "Sun, 12 Apr 2009 12:43:04 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jun 2009 17:48:44 GMT",
"version": "v2"
}
] | 2015-05-13 | [
[
"Breitbart",
"Jens",
""
],
[
"Khanna",
"Gaurav",
""
]
] | We present a detailed approach for making use of two new computer hardware architectures -- CBEA and CUDA -- for accelerating a scientific data-analysis application (Einstein@Home). Our results suggest that both the architectures suit the application quite well and the achievable performance in the same software develo... |
gr-qc/0302105 | Koryukin | Valery Koryukin (Mari State Technical University) | To the problem on the Universe evolution and the condensed description
in the field theory | 7 pages, submitted to Physics Letters B | null | null | null | gr-qc | null | On the basis of hypotheses, that a density of weakly interacting particles in
the Universe has an order of nuclear matter density or more the Lagrangian is
offered, through which one can be obtained a propagator of a vector boson with
a non-zero rest-mass. The dependence of vector bosons masses on the time allows
to ... | [
{
"created": "Wed, 26 Feb 2003 09:15:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Koryukin",
"Valery",
"",
"Mari State Technical University"
]
] | On the basis of hypotheses, that a density of weakly interacting particles in the Universe has an order of nuclear matter density or more the Lagrangian is offered, through which one can be obtained a propagator of a vector boson with a non-zero rest-mass. The dependence of vector bosons masses on the time allows to ex... |
2302.07887 | Hannah Banks | Hannah Banks, Dorota M. Grabowska and Matthew McCullough | Gravitational Wave Backgrounds from Colliding ECOs | 32 pages, 5 figures | null | null | CERN-TH-2023-016, IQuS@UW-21-044 | gr-qc astro-ph.HE hep-ex hep-ph | http://creativecommons.org/licenses/by/4.0/ | Long baseline atom interferometers offer an exciting opportunity to explore
mid-frequency gravitational waves. In this work we survey the landscape of
possible contributions to the total 'gravitational wave background' in this
frequency band and advocate for targeting this observable. Such an approach is
complimentar... | [
{
"created": "Wed, 15 Feb 2023 19:00:01 GMT",
"version": "v1"
}
] | 2023-02-17 | [
[
"Banks",
"Hannah",
""
],
[
"Grabowska",
"Dorota M.",
""
],
[
"McCullough",
"Matthew",
""
]
] | Long baseline atom interferometers offer an exciting opportunity to explore mid-frequency gravitational waves. In this work we survey the landscape of possible contributions to the total 'gravitational wave background' in this frequency band and advocate for targeting this observable. Such an approach is complimentary ... |
2302.11146 | Masumi Kasai | Masumi Kasai | A unified treatment of the redshift, the Doppler effect, and the time
dilation in general relativity | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We present a unified treatment of the gravitational and cosmological
redshift, the Doppler effect due to the moving observer or light source, and
the time dilation in the gravitational field in the framework of general
relativity.
The primary purpose of this paper is to extend the description of Narlikar
(1994) on ... | [
{
"created": "Wed, 22 Feb 2023 04:57:27 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Feb 2023 02:10:03 GMT",
"version": "v2"
},
{
"created": "Fri, 19 May 2023 09:48:19 GMT",
"version": "v3"
},
{
"created": "Thu, 12 Oct 2023 01:17:51 GMT",
"version": "v4"
}
] | 2023-10-13 | [
[
"Kasai",
"Masumi",
""
]
] | We present a unified treatment of the gravitational and cosmological redshift, the Doppler effect due to the moving observer or light source, and the time dilation in the gravitational field in the framework of general relativity. The primary purpose of this paper is to extend the description of Narlikar (1994) on the ... |
0811.1033 | Guido Festuccia | Guido Festuccia, Hong Liu | A Bohr-Sommerfeld quantization formula for quasinormal frequencies of
AdS black holes | 39 pages, 22 figures | Advanced Science Letters v 2, n 2 p 221-235, 2009 | 10.1166/asl.2009.1029 | MIT-CTP 3995, SCIPP 08/11 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a quantization formula of Bohr-Sommerfeld type for computing
quasinormal frequencies for scalar perturbations in an AdS black hole in the
limit of large scalar mass or spatial momentum. We then apply the formula to
find poles in retarded Green functions of boundary CFTs on $R^{1,d-1}$ and
$RxS^{d-1}$. We fi... | [
{
"created": "Thu, 6 Nov 2008 20:49:40 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Nov 2008 01:29:24 GMT",
"version": "v2"
}
] | 2012-07-12 | [
[
"Festuccia",
"Guido",
""
],
[
"Liu",
"Hong",
""
]
] | We derive a quantization formula of Bohr-Sommerfeld type for computing quasinormal frequencies for scalar perturbations in an AdS black hole in the limit of large scalar mass or spatial momentum. We then apply the formula to find poles in retarded Green functions of boundary CFTs on $R^{1,d-1}$ and $RxS^{d-1}$. We find... |
0911.2495 | L\'aszl\'o \'A Gergely | Zolt\'an Keresztes, L\'aszl\'o \'A. Gergely | 3+1+1 dimensional covariant gravitational dynamics on an asymmetrically
embedded brane | 7 pages; due to page limits first two sections to be published in the
Proceedings of the Grassmannian Conference in Fundamental Cosmology
(Grasscosmofun'09), Szczecin, Poland 2009, Ann. Physik; third section in the
Proceedings of the Twelfth Marcel Grossmann Meeting, Paris, France 2009 | Annalen Phys.19:249-253 (2010); Proceedings of the MG12 Meeting on
General Relativity, World Scientific, 948-1951 (2012) | 10.1002/andp.201010421 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give the evolution and constraint equations on an asymmetrically embedded
brane in the form of average and difference equations.
| [
{
"created": "Thu, 12 Nov 2009 22:47:21 GMT",
"version": "v1"
}
] | 2012-01-31 | [
[
"Keresztes",
"Zoltán",
""
],
[
"Gergely",
"László Á.",
""
]
] | We give the evolution and constraint equations on an asymmetrically embedded brane in the form of average and difference equations. |
0711.0302 | K G Arun | K. G. Arun, Luc Blanchet, Bala R. Iyer and Moh'd S. S. Qusailah | Inspiralling compact binaries in quasi-elliptical orbits: The complete
third post-Newtonian energy flux | 40 pages. Minor changes in text throughout. Minor typos in Eqs.
(3.3b), (7.7f), (8.19d) and (8.20) corrected. Matches the published version | Phys. Rev. D 77, 064035 (2008) | 10.1103/PhysRevD.77.064035 | null | gr-qc | null | The instantaneous contributions to the 3PN gravitational wave luminosity from
the inspiral phase of a binary system of compact objects moving in a quasi
elliptical orbit is computed using the multipolar post-Minkowskian wave
generation formalism. The necessary inputs for this calculation include the 3PN
accurate mass... | [
{
"created": "Fri, 2 Nov 2007 13:15:07 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Apr 2008 21:55:26 GMT",
"version": "v2"
}
] | 2009-11-13 | [
[
"Arun",
"K. G.",
""
],
[
"Blanchet",
"Luc",
""
],
[
"Iyer",
"Bala R.",
""
],
[
"Qusailah",
"Moh'd S. S.",
""
]
] | The instantaneous contributions to the 3PN gravitational wave luminosity from the inspiral phase of a binary system of compact objects moving in a quasi elliptical orbit is computed using the multipolar post-Minkowskian wave generation formalism. The necessary inputs for this calculation include the 3PN accurate mass q... |
2109.00005 | Vitor Cardoso | Vitor Cardoso, Kyriakos Destounis, Francisco Duque, Rodrigo Panosso
Macedo, Andrea Maselli | Black holes in galaxies: environmental impact on gravitational-wave
generation and propagation | 6 pages, 3 figures. v2: overall improvements in text and discussion.
Version accepted for publication in Physical Review D Letters | null | 10.1103/PhysRevD.105.L061501 | null | gr-qc astro-ph.GA physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a family of solutions of Einstein's gravity minimally coupled to
an anisotropic fluid, describing asymptotically flat black holes with "hair"
and a regular horizon. These spacetimes can describe the geometry of galaxies
harboring supermassive black holes, and are extensions of Einstein clusters to
includ... | [
{
"created": "Tue, 31 Aug 2021 18:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Feb 2022 07:13:24 GMT",
"version": "v2"
}
] | 2022-03-23 | [
[
"Cardoso",
"Vitor",
""
],
[
"Destounis",
"Kyriakos",
""
],
[
"Duque",
"Francisco",
""
],
[
"Macedo",
"Rodrigo Panosso",
""
],
[
"Maselli",
"Andrea",
""
]
] | We introduce a family of solutions of Einstein's gravity minimally coupled to an anisotropic fluid, describing asymptotically flat black holes with "hair" and a regular horizon. These spacetimes can describe the geometry of galaxies harboring supermassive black holes, and are extensions of Einstein clusters to include ... |
gr-qc/0101124 | null | M. Sharif (Hanyang University) | Matter Collineations of Some Well Known Spacetimes | 20 pages, no figure, Latex | Nuovo Cim. B116 (2001) 673-688 | null | null | gr-qc | null | We derive matter collineations of the Bianchi types I, II, III, VIII and IX,
and Kantowski-Sachs spacetimes. It is found that matter collineations turn out
similar to Ricci collineations with different constranit equations. We solve
the constraint equation for a particular case and obtain three cosmological
models wh... | [
{
"created": "Tue, 30 Jan 2001 23:03:20 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sharif",
"M.",
"",
"Hanyang University"
]
] | We derive matter collineations of the Bianchi types I, II, III, VIII and IX, and Kantowski-Sachs spacetimes. It is found that matter collineations turn out similar to Ricci collineations with different constranit equations. We solve the constraint equation for a particular case and obtain three cosmological models whic... |
2009.01075 | LIGO Scientific and Virgo Collaborations | The LIGO Scientific Collaboration and the Virgo Collaboration: R.
Abbott, T. D. Abbott, S. Abraham, F. Acernese, K. Ackley, C. Adams, R. X.
Adhikari, V. B. Adya, C. Affeldt, M. Agathos, K. Agatsuma, N. Aggarwal, O. D.
Aguiar, A. Aich, L. Aiello, A. Ain, P. Ajith, S. Akcay, G. Allen, A. Allocca,
P. A. Altin, A. ... | GW190521: A Binary Black Hole Merger with a Total Mass of $150 ~
M_{\odot}$ | Supplementary Material at https://dcc.ligo.org/LIGO-P2000020/Public | Phys. Rev. Lett. 125, 101102 (2020) | 10.1103/PhysRevLett.125.101102 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | On May 21, 2019 at 03:02:29 UTC Advanced LIGO and Advanced Virgo observed a
short duration gravitational-wave signal, GW190521, with a three-detector
network signal-to-noise ratio of 14.7, and an estimated false-alarm rate of 1
in 4900 yr using a search sensitive to generic transients. If GW190521 is from
a quasicirc... | [
{
"created": "Wed, 2 Sep 2020 13:49:51 GMT",
"version": "v1"
}
] | 2020-09-03 | [
[
"The LIGO Scientific Collaboration",
"",
""
],
[
"the Virgo Collaboration",
"",
""
],
[
"Abbott",
"R.",
""
],
[
"Abbott",
"T. D.",
""
],
[
"Abraham",
"S.",
""
],
[
"Acernese",
"F.",
""
],
[
"Ackley",
"K.",
... | On May 21, 2019 at 03:02:29 UTC Advanced LIGO and Advanced Virgo observed a short duration gravitational-wave signal, GW190521, with a three-detector network signal-to-noise ratio of 14.7, and an estimated false-alarm rate of 1 in 4900 yr using a search sensitive to generic transients. If GW190521 is from a quasicircul... |
gr-qc/9701060 | Gerard Clement | Gerard Clement | Flat wormholes from straight cosmic strings | latex file, 22 pages, 10 latex (bezier) figures | J.Math.Phys. 38 (1997) 5807-5819 | 10.1063/1.532167 | GCR-97/02/01 | gr-qc | null | We describe the analytical extension of certain static cylindrical
multi--cosmic string metrics to wormhole spacetimes with only one region at
spatial infinity, and investigate in detail the geometry of asymptotically
Minkowskian wormhole spacetimes generated by one or two cosmic strings. We find
that such wormholes ... | [
{
"created": "Tue, 28 Jan 1997 16:37:20 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Clement",
"Gerard",
""
]
] | We describe the analytical extension of certain static cylindrical multi--cosmic string metrics to wormhole spacetimes with only one region at spatial infinity, and investigate in detail the geometry of asymptotically Minkowskian wormhole spacetimes generated by one or two cosmic strings. We find that such wormholes te... |
1310.1061 | Alcides Garat | Alcides Garat | Dynamical symmetry breaking in non-Abelian geometrodynamics | arXiv admin note: substantial text overlap with arXiv:1306.0602,
arXiv:1306.2174, arXiv:gr-qc/0602049 | Gen Relativ Gravit (2019) 51: 147 | 10.1007/s10714-019-2637-8 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We are going to analyze through a first order perturbative formulation the
local loss of symmetry when a source of non-Abelian Yang-Mills and
gravitational fields interacts with an external agent that perturbes the
original geometry associated to the source. Then, as the symmetry in Abelian
and non-Abelian field stru... | [
{
"created": "Wed, 2 Oct 2013 03:55:49 GMT",
"version": "v1"
}
] | 2019-11-21 | [
[
"Garat",
"Alcides",
""
]
] | We are going to analyze through a first order perturbative formulation the local loss of symmetry when a source of non-Abelian Yang-Mills and gravitational fields interacts with an external agent that perturbes the original geometry associated to the source. Then, as the symmetry in Abelian and non-Abelian field struct... |
1202.4487 | Reinoud Slagter | R. J. Slagter and D. Masselink | Warped Self-Gravitating U(1) Gauge Cosmic Strings in 5D | 27 figures . july 2012: final version. To appear in IJMPD | null | 10.1142/S0218271812500605 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the "classical" Nielsen-Olesen vortex solution on a warped five
dimensional space time, where we solved the effective four-dimensional
equations from the five-dimensional equations together with the junction and
boundary conditions. Four dimensional cosmic strings show some serious problems
concerning the ... | [
{
"created": "Mon, 20 Feb 2012 22:46:18 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Feb 2012 21:12:54 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Mar 2012 17:02:37 GMT",
"version": "v3"
},
{
"created": "Fri, 13 Apr 2012 16:21:44 GMT",
"version": "v4"
},
{
"cr... | 2015-06-04 | [
[
"Slagter",
"R. J.",
""
],
[
"Masselink",
"D.",
""
]
] | We present the "classical" Nielsen-Olesen vortex solution on a warped five dimensional space time, where we solved the effective four-dimensional equations from the five-dimensional equations together with the junction and boundary conditions. Four dimensional cosmic strings show some serious problems concerning the me... |
2105.07226 | Bogeun Gwak | Bogeun Gwak | Weak Cosmic Censorship Conjecture in Kerr-Newman-(Anti-)de Sitter Black
Hole with Charged Scalar Field | 25 pages, 15 figures | JCAP 10 (2021) 012 | 10.1088/1475-7516/2021/10/012 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the weak cosmic censorship conjecture in extremal and
near-extremal Kerr-Newman-(anti-)de Sitter black holes by the scattering of a
massive scalar field with an electric charge. Under this scattering, the scalar
field fluxes change the black hole state, as determined by the mass, angular
momentum, and ... | [
{
"created": "Sat, 15 May 2021 14:08:09 GMT",
"version": "v1"
}
] | 2021-10-13 | [
[
"Gwak",
"Bogeun",
""
]
] | We investigate the weak cosmic censorship conjecture in extremal and near-extremal Kerr-Newman-(anti-)de Sitter black holes by the scattering of a massive scalar field with an electric charge. Under this scattering, the scalar field fluxes change the black hole state, as determined by the mass, angular momentum, and el... |
2203.13992 | Shibesh Kumar Jas Pacif | Ritika Nagpal, Shibesh Kumar Jas Pacif, Abhishek Parida | Reconstructing cosmic evolution with a density parametrization | 19 pages, 12 figures with sub figures | null | 10.1142/S0217732322501127 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The current paper provides a comprehensive examination of a dark energy
cosmological model in the classical regime, in which a generic scalar field is
regarded as a dark energy source. Einstein's field equations are solved in
model independent way i.e. using a scheme of cosmological parametrization. A
parametrization... | [
{
"created": "Sat, 26 Mar 2022 05:03:50 GMT",
"version": "v1"
}
] | 2022-09-07 | [
[
"Nagpal",
"Ritika",
""
],
[
"Pacif",
"Shibesh Kumar Jas",
""
],
[
"Parida",
"Abhishek",
""
]
] | The current paper provides a comprehensive examination of a dark energy cosmological model in the classical regime, in which a generic scalar field is regarded as a dark energy source. Einstein's field equations are solved in model independent way i.e. using a scheme of cosmological parametrization. A parametrization o... |
1003.4098 | Muhammad Farooq Dr. | M. Umar Farooq, Muneer A. Rashid and Mubasher Jamil | Interacting entropy-corrected new agegraphic tachyon, K-essence and
dilaton scalar field models of dark energy in non-flat universe | 11 pages, typos fixed | Int.J.Theor.Phys.49:2278-2287,2010 | 10.1007/s10773-010-0415-1 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the new agegraphic dark energy model by introducing the quantum
corrections to the entropy-area relation in the setup of loop quantum gravity.
Employing this new form of dark energy, we investigate the model of interacting
dark energy and derive its equation of state. We study the correspondence
between th... | [
{
"created": "Mon, 22 Mar 2010 09:03:12 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Apr 2010 07:48:46 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Farooq",
"M. Umar",
""
],
[
"Rashid",
"Muneer A.",
""
],
[
"Jamil",
"Mubasher",
""
]
] | We present the new agegraphic dark energy model by introducing the quantum corrections to the entropy-area relation in the setup of loop quantum gravity. Employing this new form of dark energy, we investigate the model of interacting dark energy and derive its equation of state. We study the correspondence between the ... |
gr-qc/0207036 | Enore Guadagnini | Enore Guadagnini | Gravitational deflection of light and helicity asymmetry | 6 pages, 1 figure | Phys.Lett.B548:19-23,2002 | 10.1016/S0370-2693(02)02811-3 | IFUP-TH 2002-26 | gr-qc | null | The helicity modification of light polarization which is induced by the
gravitational deflection from a classical heavy rotating body, like a star or a
planet, is considered. The expression of the helicity asymmetry is derived;
this asymmetry signals the gravitationally induced spin transfer from the
rotating body to... | [
{
"created": "Mon, 8 Jul 2002 11:46:09 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Guadagnini",
"Enore",
""
]
] | The helicity modification of light polarization which is induced by the gravitational deflection from a classical heavy rotating body, like a star or a planet, is considered. The expression of the helicity asymmetry is derived; this asymmetry signals the gravitationally induced spin transfer from the rotating body to t... |
2311.15391 | Vesselin G. Gueorguiev | Andre Maeder and Vesselin G. Gueorguiev | The Scale-Invariant Vacuum (SIV) Theory: A Possible Origin of Dark
Matter and Dark Energy | 33 pages, 11 figures, 1 table | Universe 2020, 6(3), 46; https://www.mdpi.com/2218-1997/6/3/46 | 10.3390/universe6030046 | null | gr-qc astro-ph.CO astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Scale Invariant Vacuum (SIV) theory rests on the basic hypothesis that
the macroscopic empty space is scale invariant. This hypothesis is applied in
the context of the Integrable Weyl Geometry, where it leads to considerable
simplifications in the scale covariant cosmological equations. After an initial
explosion... | [
{
"created": "Sun, 26 Nov 2023 19:19:51 GMT",
"version": "v1"
}
] | 2023-11-28 | [
[
"Maeder",
"Andre",
""
],
[
"Gueorguiev",
"Vesselin G.",
""
]
] | The Scale Invariant Vacuum (SIV) theory rests on the basic hypothesis that the macroscopic empty space is scale invariant. This hypothesis is applied in the context of the Integrable Weyl Geometry, where it leads to considerable simplifications in the scale covariant cosmological equations. After an initial explosion a... |
2402.02594 | Lydia Bieri | Lydia Bieri, Alexander Polnarev | Gravitational Wave Displacement and Velocity Memory Effects | 19 pages | Class. Quantum Grav. 41 135012 2024 | 10.1088/1361-6382/ad4dfe | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we compare in detail the linear and nonlinear approach to
the Gravitational Waves Displacement and Velocity Memory (GWDM and GWVM)
effects. We consider astrophysical situations that give rise to gravitational
waves with GWVM effect, i.e. with a residual velocity (the so-called
"velocity-coded memory"... | [
{
"created": "Sun, 4 Feb 2024 20:05:59 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Feb 2024 06:56:44 GMT",
"version": "v2"
},
{
"created": "Sat, 6 Apr 2024 07:37:16 GMT",
"version": "v3"
},
{
"created": "Fri, 10 May 2024 16:52:21 GMT",
"version": "v4"
},
{
"crea... | 2024-06-21 | [
[
"Bieri",
"Lydia",
""
],
[
"Polnarev",
"Alexander",
""
]
] | In this article, we compare in detail the linear and nonlinear approach to the Gravitational Waves Displacement and Velocity Memory (GWDM and GWVM) effects. We consider astrophysical situations that give rise to gravitational waves with GWVM effect, i.e. with a residual velocity (the so-called "velocity-coded memory") ... |
1810.06381 | Xian Hou | Xian Hou, Zhaoyi Xu and Jiancheng Wang | Rotating Black Hole Shadow in Perfect Fluid Dark Matter | 9 pages, 3 figures. arXiv admin note: text overlap with
arXiv:1806.09415, arXiv:1804.08110 | null | 10.1088/1475-7516/2018/12/040 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study analytically the shadow cast by the rotating black hole in the
perfect fluid dark matter. The apparent shape of the shadow depends upon the
black hole spin $a$ and the perfect fluid dark matter intensity parameter $k$
($k>0$). In general, the shadow is a perfect circle in the non-rotating case
($a=0$) and a ... | [
{
"created": "Fri, 12 Oct 2018 06:26:30 GMT",
"version": "v1"
}
] | 2018-12-26 | [
[
"Hou",
"Xian",
""
],
[
"Xu",
"Zhaoyi",
""
],
[
"Wang",
"Jiancheng",
""
]
] | We study analytically the shadow cast by the rotating black hole in the perfect fluid dark matter. The apparent shape of the shadow depends upon the black hole spin $a$ and the perfect fluid dark matter intensity parameter $k$ ($k>0$). In general, the shadow is a perfect circle in the non-rotating case ($a=0$) and a de... |
gr-qc/0012048 | Diego Pavon | Narayan Banerjee (Department of Physics, Jadavpur University, India)
and Diego Pavon (Department of Physics, Autonomous University of Barcelona,
Spain) | Cosmic acceleration without quintessence | Latex file, 7 pages, no figures, to be published in Phys. Rev. D | Phys.Rev. D63 (2001) 043504 | 10.1103/PhysRevD.63.043504 | null | gr-qc astro-ph | null | It is argued that the Brans-Dicke theory may explain the present accelerated
expansion of the universe without resorting to a cosmological constant or
quintessence matter
| [
{
"created": "Thu, 14 Dec 2000 17:19:38 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Banerjee",
"Narayan",
"",
"Department of Physics, Jadavpur University, India"
],
[
"Pavon",
"Diego",
"",
"Department of Physics, Autonomous University of Barcelona,\n Spain"
]
] | It is argued that the Brans-Dicke theory may explain the present accelerated expansion of the universe without resorting to a cosmological constant or quintessence matter |
1612.03822 | Mart\'in G. Richarte MR | Martin G. Richarte and Gilberto M. Kremer | Cosmological perturbations in transient phantom inflation scenarios | 11pp. Accepted for its publication in EPJC.
http://link.springer.com/article/10.1140/epjc/s10052-017-4629-8 | The European Physical Journal C, 77(1), 1-11, 2017 | 10.1140/epjc/s10052-017-4629-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a model of inflation where the inflaton is accommodated as a
phantom field which exhibits an initial transient pole behavior and then decays
into a quintessence field which is responsible for a radiation era. We must
stress that the present unified model only deals with a single field and that
the transiti... | [
{
"created": "Mon, 12 Dec 2016 18:06:12 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Jan 2017 04:54:35 GMT",
"version": "v2"
}
] | 2017-02-01 | [
[
"Richarte",
"Martin G.",
""
],
[
"Kremer",
"Gilberto M.",
""
]
] | We present a model of inflation where the inflaton is accommodated as a phantom field which exhibits an initial transient pole behavior and then decays into a quintessence field which is responsible for a radiation era. We must stress that the present unified model only deals with a single field and that the transition... |
2306.01024 | Sunil Maurya DR. | Jyatsnasree Bora, Dhruba Jyoti Gogoi, S. K. Maurya, G. Mustafa | Impact of energy-momentum conservation violation on the configuration of
compact stars and their GW echoes | 8 figures and 4 tables | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | This work investigates the impacts of energy-momentum conservation violation
on the configuration of strange stars constraint with gravitational wave (GW)
event GW190814 as well as eight recent observations of compact objects. The GW
echoes from these interesting classes of compact objects are also calculated.
To des... | [
{
"created": "Thu, 1 Jun 2023 10:33:30 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Jan 2024 09:38:18 GMT",
"version": "v2"
}
] | 2024-01-23 | [
[
"Bora",
"Jyatsnasree",
""
],
[
"Gogoi",
"Dhruba Jyoti",
""
],
[
"Maurya",
"S. K.",
""
],
[
"Mustafa",
"G.",
""
]
] | This work investigates the impacts of energy-momentum conservation violation on the configuration of strange stars constraint with gravitational wave (GW) event GW190814 as well as eight recent observations of compact objects. The GW echoes from these interesting classes of compact objects are also calculated. To descr... |
1405.4148 | Carlos A. Batista da S. Filho | Carlos Batista | Killing-Yano Tensors of Order n-1 | 15 pages. Published Version | Class. Quantum Grav. 31 (2014) 165019 | 10.1088/0264-9381/31/16/165019 | null | gr-qc hep-th math.DG | http://creativecommons.org/licenses/by/3.0/ | The properties of a Killing-Yano tensor of order n-1 in an n-dimensional
manifold are investigated. The integrability conditions are worked out and all
metrics admitting a Killing-Yano tensor of order n-1 are found. It is pointed
out a connection between such tensors and a generalization of the concept of
angular mom... | [
{
"created": "Fri, 16 May 2014 12:33:04 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Aug 2014 17:50:41 GMT",
"version": "v2"
}
] | 2014-08-07 | [
[
"Batista",
"Carlos",
""
]
] | The properties of a Killing-Yano tensor of order n-1 in an n-dimensional manifold are investigated. The integrability conditions are worked out and all metrics admitting a Killing-Yano tensor of order n-1 are found. It is pointed out a connection between such tensors and a generalization of the concept of angular momen... |
1007.4044 | Ya-Peng Hu | Ya-Peng Hu | Hawking radiation from the cosmological horizon in a FRW universe | V3: 12 pages, no figure, typos corrected, new references added,
version shorted and accepted by PLB | Phys.Lett.B701:269-274,2011 | 10.1016/j.physletb.2011.05.054 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that there is a Hawking radiation from the cosmological
horizon of the de-sitter spacetime, and the de-sitter spacetime can be a
special case of a FRW universe. Therefore, there may be a corresponding Hawking
radiation in a FRW universe. Indeed, there have been several clues showing that
there is a H... | [
{
"created": "Fri, 23 Jul 2010 05:33:36 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Oct 2010 03:21:31 GMT",
"version": "v2"
},
{
"created": "Tue, 14 Jun 2011 05:11:00 GMT",
"version": "v3"
}
] | 2011-06-24 | [
[
"Hu",
"Ya-Peng",
""
]
] | It is well known that there is a Hawking radiation from the cosmological horizon of the de-sitter spacetime, and the de-sitter spacetime can be a special case of a FRW universe. Therefore, there may be a corresponding Hawking radiation in a FRW universe. Indeed, there have been several clues showing that there is a Haw... |
1307.1866 | Victor Shchigolev Konstantinovich | V.K. Shchigolev | Cosmology with an Effective $\Lambda$-Term in Lyra Manifold | 5 pages, 1 figure | CHIN. PHYS. LETT. Vol. 30, No. 11 (2013) 119801 | 10.1088/0256-307X/30/11/119801 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A cosmological model in Lyra's geometry are studied under the assumption that
an effective cosmological term is appeared in the field equations as the result
of interaction between the displacement vector field and an auxiliary $ \Lambda
$ - term. Some exact solutions of the model equations are obtained and
prelimina... | [
{
"created": "Sun, 7 Jul 2013 14:06:34 GMT",
"version": "v1"
}
] | 2013-10-31 | [
[
"Shchigolev",
"V. K.",
""
]
] | A cosmological model in Lyra's geometry are studied under the assumption that an effective cosmological term is appeared in the field equations as the result of interaction between the displacement vector field and an auxiliary $ \Lambda $ - term. Some exact solutions of the model equations are obtained and preliminary... |
1509.01235 | Yurii Ignat'ev | Yurii Ignat'ev | Macroscopic Einstein Equations for a Cosmological Model with
$\lambda$-term | 11 pages, 11references | null | 10.1134/S0202289316030075 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Through averaging the Einstein equations over transverse gravitational
perturbations it is obtained a closed system of two ordinary differential
equations describing macroscopic cosmological evolution of the isotropic
space-flat Universe filled with gravitational radiation. It is found an
asymptotic solution of evolu... | [
{
"created": "Thu, 3 Sep 2015 19:44:28 GMT",
"version": "v1"
}
] | 2016-08-24 | [
[
"Ignat'ev",
"Yurii",
""
]
] | Through averaging the Einstein equations over transverse gravitational perturbations it is obtained a closed system of two ordinary differential equations describing macroscopic cosmological evolution of the isotropic space-flat Universe filled with gravitational radiation. It is found an asymptotic solution of evoluti... |
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