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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/0608108 | Piotr T. Chru\'sciel | Yvonne Choquet-Bruhat, Piotr T. Chrusciel, Julien Loizelet | Global solutions of the Einstein-Maxwell equations in higher dimensions | minor corrections | Class.Quant.Grav. 23 (2006) 7383-7394 | 10.1088/0264-9381/23/24/011 | AEI-2006-065 | gr-qc | null | We consider the Einstein-Maxwell equations in space-dimension $n$. We point
out that the Lindblad-Rodnianski stability proof applies to those equations
whatever the space-dimension $n\ge 3$. In even space-time dimension $n+1\ge 6$
we use the standard conformal method on a Minkowski background to give a simple
proof t... | [
{
"created": "Thu, 24 Aug 2006 08:15:06 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Nov 2006 07:25:18 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Choquet-Bruhat",
"Yvonne",
""
],
[
"Chrusciel",
"Piotr T.",
""
],
[
"Loizelet",
"Julien",
""
]
] | We consider the Einstein-Maxwell equations in space-dimension $n$. We point out that the Lindblad-Rodnianski stability proof applies to those equations whatever the space-dimension $n\ge 3$. In even space-time dimension $n+1\ge 6$ we use the standard conformal method on a Minkowski background to give a simple proof tha... |
1307.1145 | Helvi Witek | Helvi Witek | Black hole dynamics in generic spacetimes | PhD thesis, 191pp | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dynamics of black hole spacetimes play a crucial role in astrophysics,
high energy physics and fundamental physics. In this thesis I have investigated
the dynamics of black holes in generic spacetimes by extending established
numerical relativity methods to higher dimensional or non-asymptotically flat
spacetimes... | [
{
"created": "Wed, 3 Jul 2013 20:16:52 GMT",
"version": "v1"
}
] | 2013-07-05 | [
[
"Witek",
"Helvi",
""
]
] | The dynamics of black hole spacetimes play a crucial role in astrophysics, high energy physics and fundamental physics. In this thesis I have investigated the dynamics of black holes in generic spacetimes by extending established numerical relativity methods to higher dimensional or non-asymptotically flat spacetimes. ... |
gr-qc/0504076 | Achim Kempf | S. Bachmann, A. Kempf | The Transplanckian Question and the Casimir Effect | 26 pages, LaTeX, 3 figures | null | null | null | gr-qc | null | It is known that, through inflation, Planck scale phenomena should have left
an imprint in the cosmic microwave background. The magnitude of this imprint is
expected to be suppressed by a factor $\sigma^n$ where $\sigma\approx 10^{-5}$
is the ratio of the Planck length to the Hubble length during inflation. While
the... | [
{
"created": "Mon, 18 Apr 2005 08:34:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bachmann",
"S.",
""
],
[
"Kempf",
"A.",
""
]
] | It is known that, through inflation, Planck scale phenomena should have left an imprint in the cosmic microwave background. The magnitude of this imprint is expected to be suppressed by a factor $\sigma^n$ where $\sigma\approx 10^{-5}$ is the ratio of the Planck length to the Hubble length during inflation. While there... |
gr-qc/9909043 | Marsha Weaver | Marsha Weaver | Dynamics of magnetic Bianchi VI_0 cosmologies | 14 pages, 1 figure. Final version | Class.Quant.Grav. 17 (2000) 421-434 | 10.1088/0264-9381/17/2/311 | AEI-1999-57 | gr-qc | null | Methods of dynamical systems analysis are used to show rigorously that the
presence of a magnetic field orthogonal to the two commuting Killing vector
fields in any spatially homogeneous Bianchi type VI_0 vacuum solution to
Einstein's equation changes the evolution toward the singularity from
convergent to oscillator... | [
{
"created": "Tue, 14 Sep 1999 18:01:49 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Nov 1999 23:01:11 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Nov 1999 00:05:55 GMT",
"version": "v3"
},
{
"created": "Thu, 23 Dec 1999 17:41:55 GMT",
"version": "v4"
}
] | 2009-10-31 | [
[
"Weaver",
"Marsha",
""
]
] | Methods of dynamical systems analysis are used to show rigorously that the presence of a magnetic field orthogonal to the two commuting Killing vector fields in any spatially homogeneous Bianchi type VI_0 vacuum solution to Einstein's equation changes the evolution toward the singularity from convergent to oscillatory.... |
2304.08141 | Pedro Bessa MSc. | Pedro Bessa | Strong Gravitational Lensing in Horndeski theory | 10 pages, accepted for publication in PRD. Includes small corrections
to the accepted that do not alter the content of the text | null | 10.1103/PhysRevD.108.024062 | null | gr-qc | http://creativecommons.org/licenses/by-nc-nd/4.0/ | In this paper we build the general formalism of gravitational lensing in
luminal Horndeski theories, deriving the Jacobi matrix equation and the general
angular diameter distance in these theories through the screen space formalism.
We generalize the focusing and multiple lensing theorems to include Scalar
Tensor the... | [
{
"created": "Mon, 17 Apr 2023 10:46:52 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Jul 2023 08:56:39 GMT",
"version": "v2"
}
] | 2023-08-07 | [
[
"Bessa",
"Pedro",
""
]
] | In this paper we build the general formalism of gravitational lensing in luminal Horndeski theories, deriving the Jacobi matrix equation and the general angular diameter distance in these theories through the screen space formalism. We generalize the focusing and multiple lensing theorems to include Scalar Tensor theor... |
1805.11581 | LIGO Scientific Collaboration and Virgo Collaboration | The LIGO Scientific Collaboration and the Virgo Collaboration: B. P.
Abbott, R. Abbott, T. D. Abbott, F. Acernese, K. Ackley, C. Adams, T. Adams,
P. Addesso, R. X. Adhikari, V. B. Adya, C. Affeldt, B. Agarwal, M. Agathos,
K. Agatsuma, N. Aggarwal, O. D. Aguiar, L. Aiello, A. Ain, P. Ajith, B.
Allen, G. Allen, A... | GW170817: Measurements of Neutron Star Radii and Equation of State | 10 pages, 3 figures; v2 matches published version; data associated
with the figures can be found at https://dcc.ligo.org/LIGO-P1800115/public | Phys. Rev. Lett. 121, 161101 (2018) | 10.1103/PhysRevLett.121.161101 | LIGO-P1800115 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | On 17 August 2017, the LIGO and Virgo observatories made the first direct
detection of gravitational waves from the coalescence of a neutron star binary
system. The detection of this gravitational-wave signal, GW170817, offers a
novel opportunity to directly probe the properties of matter at the extreme
conditions fo... | [
{
"created": "Tue, 29 May 2018 16:56:13 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Oct 2018 17:59:04 GMT",
"version": "v2"
}
] | 2018-10-16 | [
[
"The LIGO Scientific Collaboration",
"",
""
],
[
"the Virgo Collaboration",
"",
""
],
[
"Abbott",
"B. P.",
""
],
[
"Abbott",
"R.",
""
],
[
"Abbott",
"T. D.",
""
],
[
"Acernese",
"F.",
""
],
[
"Ackley",
"K.",
... | On 17 August 2017, the LIGO and Virgo observatories made the first direct detection of gravitational waves from the coalescence of a neutron star binary system. The detection of this gravitational-wave signal, GW170817, offers a novel opportunity to directly probe the properties of matter at the extreme conditions foun... |
1010.5955 | Gao Changjun | Changjun Gao and Anzhong Wang | Ghosts and Stability of Asymptotical Safe Gravity in the Minkowski
Background | 6 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the problems of ghosts and stability in the framework of
asymptotical safe theory of gravity in the Minkowski background. Within one
loop corrections, we obtain explicitly the constraints on the coupling
parameters. Applying them to the coupling constant recently-obtained at the
fixed point, we find th... | [
{
"created": "Thu, 28 Oct 2010 13:10:18 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Dec 2010 00:57:44 GMT",
"version": "v2"
}
] | 2010-12-06 | [
[
"Gao",
"Changjun",
""
],
[
"Wang",
"Anzhong",
""
]
] | We investigate the problems of ghosts and stability in the framework of asymptotical safe theory of gravity in the Minkowski background. Within one loop corrections, we obtain explicitly the constraints on the coupling parameters. Applying them to the coupling constant recently-obtained at the fixed point, we find that... |
1308.5007 | Fabiola Arevalo | F. Arevalo, P. Cifuentes, S. Lepe and F. Pe\~na | Interacting Ricci-like holographic dark energy | 16 pages, 6 figures, references and comments added, to appear in
Astrophys. Space Sci | null | 10.1007/s10509-014-1946-3 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a flat Friedmann-Lema\^itre-Robertson-Walker background, a scheme of dark
matter-dark energy interaction is studied considering a holographic Ricci-like
model for the dark energy. Without giving a priori some specific model for the
interaction function, we show that this function can experience a change of
sign du... | [
{
"created": "Thu, 22 Aug 2013 22:06:56 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Dec 2013 03:56:36 GMT",
"version": "v2"
},
{
"created": "Wed, 2 Jul 2014 20:09:32 GMT",
"version": "v3"
}
] | 2014-07-04 | [
[
"Arevalo",
"F.",
""
],
[
"Cifuentes",
"P.",
""
],
[
"Lepe",
"S.",
""
],
[
"Peña",
"F.",
""
]
] | In a flat Friedmann-Lema\^itre-Robertson-Walker background, a scheme of dark matter-dark energy interaction is studied considering a holographic Ricci-like model for the dark energy. Without giving a priori some specific model for the interaction function, we show that this function can experience a change of sign duri... |
gr-qc/0010052 | Peter Huebner | Peter Huebner | Numerical Calculation of Conformally Smooth Hyperboloidal Data | 22 pages, 8 figures, revtex4 | Class.Quant.Grav. 18 (2001) 1421-1440 | 10.1088/0264-9381/18/8/302 | AEI-2000-066 | gr-qc | null | This is the third paper in a series describing a numerical implementation of
the conformal Einstein equation. This paper describes a scheme to calculate
(three) dimensional data for the conformal field equations from a set of free
functions. The actual implementation depends on the topology of the spacetime.
We discu... | [
{
"created": "Fri, 13 Oct 2000 13:45:50 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Huebner",
"Peter",
""
]
] | This is the third paper in a series describing a numerical implementation of the conformal Einstein equation. This paper describes a scheme to calculate (three) dimensional data for the conformal field equations from a set of free functions. The actual implementation depends on the topology of the spacetime. We discuss... |
gr-qc/0302031 | Santiago Esteban Perez Bergliaffa | Santiago E. Perez Bergliaffa | Propagation of perturbations in non-linear spin-2 theories | 8 pages, RevTex4, contribution to the Festschrift in honor of
Professor Mario Novello's 60th birthday | null | null | null | gr-qc | null | In this communication I analyze the problem of complete exceptionality of
wave propagation in a class of spin 2 field theories. I show that, under the
imposition of the good weak-field limit, only two Lagrangians are completely
exceptional. These are the linear Fierz Lagrangian, and a Born-Infeld-like
Lagrangian. As ... | [
{
"created": "Mon, 10 Feb 2003 13:06:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bergliaffa",
"Santiago E. Perez",
""
]
] | In this communication I analyze the problem of complete exceptionality of wave propagation in a class of spin 2 field theories. I show that, under the imposition of the good weak-field limit, only two Lagrangians are completely exceptional. These are the linear Fierz Lagrangian, and a Born-Infeld-like Lagrangian. As a ... |
gr-qc/9703003 | Masayuki Tanimoto | Masayuki Tanimoto | On the null surface formalism -- Formulation in three dimensions and
gauge freedom | 6 pages, LaTeX. To appear in Proceedings of the sixth workshop on
General Relativity and Gravitation | null | null | null | gr-qc | null | The null surface formalism of GR in three dimensions is presented, and the
gauge freedom thereof, which is not just diffeomorphism, is discussed briefly.
| [
{
"created": "Fri, 28 Feb 1997 18:54:42 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Tanimoto",
"Masayuki",
""
]
] | The null surface formalism of GR in three dimensions is presented, and the gauge freedom thereof, which is not just diffeomorphism, is discussed briefly. |
gr-qc/0609016 | Ozgur Delice | Ozgur Delice | Local cosmic strings in Brans-Dicke theory with a cosmological constant | 5 pages, Revtex | Phys.Rev.D74:067703,2006 | 10.1103/PhysRevD.74.067703 | null | gr-qc | null | It is known that Vilenkin's phenomenological equation of state for static
straight cosmic strings is inconsistent with Brans-Dicke theory. We will prove
that, in the presence of a cosmological constant, this equation of state is
consistent with Brans-Dicke theory. The general solution of the full nonlinear
field equa... | [
{
"created": "Tue, 5 Sep 2006 21:29:37 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Sep 2006 00:52:50 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Delice",
"Ozgur",
""
]
] | It is known that Vilenkin's phenomenological equation of state for static straight cosmic strings is inconsistent with Brans-Dicke theory. We will prove that, in the presence of a cosmological constant, this equation of state is consistent with Brans-Dicke theory. The general solution of the full nonlinear field equati... |
gr-qc/0103011 | Roberto Gomez | Roberto Gomez (University of Pittsburgh) | Gravitational waveforms with controlled accuracy | Revised version, published in Phys. Rev. D, RevTeX, 16 pages, 4
figures | Phys.Rev. D64 (2001) 024007 | 10.1103/PhysRevD.64.024007 | null | gr-qc | null | A partially first-order form of the characteristic formulation is introduced
to control the accuracy in the computation of gravitational waveforms produced
by highly distorted single black hole spacetimes. Our approach is to reduce the
system of equations to first-order differential form on the angular
derivatives, w... | [
{
"created": "Mon, 5 Mar 2001 14:22:54 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Jun 2001 17:26:08 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Gomez",
"Roberto",
"",
"University of Pittsburgh"
]
] | A partially first-order form of the characteristic formulation is introduced to control the accuracy in the computation of gravitational waveforms produced by highly distorted single black hole spacetimes. Our approach is to reduce the system of equations to first-order differential form on the angular derivatives, whi... |
1012.4614 | Yury Eroshenko | V.I. Dokuchaev, Yu.N. Eroshenko | Cosmological Horizons as They Are Looked from a Moving Frame | 3 pages, 2 figures, preprint submitted to Theoretical Physics | Theoretical Physics 1, 18 (2016) | 10.22606/tp.2016.11005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the cosmological horizons in the expanding universe from the
point of view of observer moving with respect to CMB frame. The deformation
(non-sphericity) of cosmological horizons is demonstrated. Some principle
consequences are discussed.
| [
{
"created": "Tue, 21 Dec 2010 11:33:10 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jan 2017 21:14:16 GMT",
"version": "v2"
}
] | 2017-01-20 | [
[
"Dokuchaev",
"V. I.",
""
],
[
"Eroshenko",
"Yu. N.",
""
]
] | We consider the cosmological horizons in the expanding universe from the point of view of observer moving with respect to CMB frame. The deformation (non-sphericity) of cosmological horizons is demonstrated. Some principle consequences are discussed. |
1801.04833 | Natascha Riahi | Natascha Riahi | Wavepacket evolution in unimodular quantum cosmology | 14 pages, 2 figures; contribution to "Cosmology and the Quantum
Vacuum"(Segovia 2017) | Galaxies 2018, 6(1),8 | 10.3390/galaxies6010008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The unimodular theory of gravity admits a canonical quantization of
minisuperspace models without the problem of time. We derive instead a kind of
Schr\"odinger equation. We have found unitarily evolving wave packet solutions
for the special case of a massless scalar field and a spatially flat Friedmann
universe. We ... | [
{
"created": "Mon, 15 Jan 2018 15:00:29 GMT",
"version": "v1"
}
] | 2018-01-17 | [
[
"Riahi",
"Natascha",
""
]
] | The unimodular theory of gravity admits a canonical quantization of minisuperspace models without the problem of time. We derive instead a kind of Schr\"odinger equation. We have found unitarily evolving wave packet solutions for the special case of a massless scalar field and a spatially flat Friedmann universe. We sh... |
2212.13183 | Arnab Dhani | Arnab Dhani, Ssohrab Borhanian, Anuradha Gupta, Bangalore
Sathyaprakash | Cosmography with bright and Love sirens | null | null | null | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Precision cosmology is crucial to understand the different energy components
in the Universe and their evolution through cosmic time. Gravitational wave
sources are standard sirens that can accurately map out distances in the
Universe. Together with the source redshift information, we can then probe the
expansion his... | [
{
"created": "Mon, 26 Dec 2022 15:10:04 GMT",
"version": "v1"
}
] | 2022-12-27 | [
[
"Dhani",
"Arnab",
""
],
[
"Borhanian",
"Ssohrab",
""
],
[
"Gupta",
"Anuradha",
""
],
[
"Sathyaprakash",
"Bangalore",
""
]
] | Precision cosmology is crucial to understand the different energy components in the Universe and their evolution through cosmic time. Gravitational wave sources are standard sirens that can accurately map out distances in the Universe. Together with the source redshift information, we can then probe the expansion histo... |
1512.04755 | Pedro Moraes | D. Momeni, P.H.R.S. Moraes, R. Myrzakulov | Generalized second law of thermodynamics in f(R,T) theory of gravity | 6 pages, no figures, accepted for publication in Astrophys. Space Sci | Astrophys.Space Sci. 361 (2016) no.7, 228 | 10.1007/s10509-016-2784-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a study of the generalized second law of thermodynamics in the
scope of the f(R,T) theory of gravity, with R and T representing the Ricci
scalar and trace of the energy-momentum tensor, respectively. From the
energy-momentum tensor equation for the f(R,T) = R + f(T) case, we calculate
the form of the geome... | [
{
"created": "Tue, 15 Dec 2015 12:21:18 GMT",
"version": "v1"
},
{
"created": "Wed, 18 May 2016 12:32:33 GMT",
"version": "v2"
}
] | 2018-10-09 | [
[
"Momeni",
"D.",
""
],
[
"Moraes",
"P. H. R. S.",
""
],
[
"Myrzakulov",
"R.",
""
]
] | We present a study of the generalized second law of thermodynamics in the scope of the f(R,T) theory of gravity, with R and T representing the Ricci scalar and trace of the energy-momentum tensor, respectively. From the energy-momentum tensor equation for the f(R,T) = R + f(T) case, we calculate the form of the geometr... |
0712.1727 | Sergey Sushkov | Sergey V. Sushkov and Yuan-Zhong Zhang | Scalar wormholes in cosmological setting and their instability | REVTeX4, 11 pages, submitted to PRD | Phys.Rev.D77:024042,2008 | 10.1103/PhysRevD.77.024042 | null | gr-qc | null | We construct exact nonstatic nonhomogeneous spherically symmetric solutions
in the theory of gravity with a scalar field possessing the exponential
potential. The solution of particular interest corresponds to the scalar field
with negative kinetic energy, i.e. a ghost, and represents two asymptotically
homogeneous s... | [
{
"created": "Tue, 11 Dec 2007 15:09:45 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Sushkov",
"Sergey V.",
""
],
[
"Zhang",
"Yuan-Zhong",
""
]
] | We construct exact nonstatic nonhomogeneous spherically symmetric solutions in the theory of gravity with a scalar field possessing the exponential potential. The solution of particular interest corresponds to the scalar field with negative kinetic energy, i.e. a ghost, and represents two asymptotically homogeneous spa... |
gr-qc/0308086 | Wung-Hong Huang | Wung-Hong Huang | Particle Creation in Kaluza-Klein Cosmology | Latex 11 pages | Phys.Lett.A140:280-284,1989 | 10.1016/0375-9601(89)90619-1 | null | gr-qc hep-th | null | We exactly calculate the particle number $N$ of scalar fields which are
created from an initial vacuum in certain higher-dimensional cosmological
models. The spacetimes in these models are the four-dimensional Chitre-Hartle
or radiation-dominated universe with extra spaces which are static or power-law
contracting. E... | [
{
"created": "Wed, 27 Aug 2003 14:21:43 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Huang",
"Wung-Hong",
""
]
] | We exactly calculate the particle number $N$ of scalar fields which are created from an initial vacuum in certain higher-dimensional cosmological models. The spacetimes in these models are the four-dimensional Chitre-Hartle or radiation-dominated universe with extra spaces which are static or power-law contracting. Exc... |
2310.17647 | Rajesh Kumar | Annu Jaiswal, Rajesh Kumar, Sudhir Kumar Srivastava, Megandhren
Govender and Shibesh Kumar Jas Pacif | Black hole formation in gravitational collapse and their astrophysical
implications | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we have investigated a novel aspect of black hole (BH)
formation during the collapse of a self-gravitating configuration. The exact
solution of the Einstein field equations is obtained in a model-independent way
by considering a parametrization of the expansion scalar ($\Theta$) in the
background of sph... | [
{
"created": "Thu, 26 Oct 2023 17:58:30 GMT",
"version": "v1"
}
] | 2023-10-27 | [
[
"Jaiswal",
"Annu",
""
],
[
"Kumar",
"Rajesh",
""
],
[
"Srivastava",
"Sudhir Kumar",
""
],
[
"Govender",
"Megandhren",
""
],
[
"Pacif",
"Shibesh Kumar Jas",
""
]
] | In this work, we have investigated a novel aspect of black hole (BH) formation during the collapse of a self-gravitating configuration. The exact solution of the Einstein field equations is obtained in a model-independent way by considering a parametrization of the expansion scalar ($\Theta$) in the background of spher... |
2206.11685 | Ho Seong Hwang | Youngsub Yoon, Jong-Chul Park, Ho Seong Hwang | Understanding Galaxy Rotation Curves with Verlinde's Emergent Gravity | 11 pages, 2 figures. To appear in Classical and Quantum Gravity | null | 10.1088/1361-6382/acaae6 | null | gr-qc astro-ph.GA hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the results from the analysis of galaxy rotation curves with
Verlinde's emergent gravity. We use the data in the SPARC (Spitzer Photometry
and Accurate Rotation Curves) database, which contains a sample of 175 nearby
disk galaxies with 3.6 $\mu$m surface photometry and rotation curves. We
compute the gravi... | [
{
"created": "Thu, 23 Jun 2022 13:24:14 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Jul 2022 11:56:23 GMT",
"version": "v2"
},
{
"created": "Fri, 16 Dec 2022 04:01:58 GMT",
"version": "v3"
}
] | 2022-12-28 | [
[
"Yoon",
"Youngsub",
""
],
[
"Park",
"Jong-Chul",
""
],
[
"Hwang",
"Ho Seong",
""
]
] | We present the results from the analysis of galaxy rotation curves with Verlinde's emergent gravity. We use the data in the SPARC (Spitzer Photometry and Accurate Rotation Curves) database, which contains a sample of 175 nearby disk galaxies with 3.6 $\mu$m surface photometry and rotation curves. We compute the gravita... |
1612.03065 | Marco Letizia | Marco Letizia and Stefano Liberati | Deformed relativity symmetries and the local structure of spacetime | 20 pages | Phys. Rev. D 95, 046007 (2017) | 10.1103/PhysRevD.95.046007 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A spacetime interpretation of deformed relativity symmetry groups was
recently proposed by resorting to Finslerian geometries, seen as the outcome of
a continuous limit endowed with first order corrections from the quantum
gravity regime. In this work we further investigate such connection between
deformed algebras a... | [
{
"created": "Fri, 9 Dec 2016 15:49:15 GMT",
"version": "v1"
}
] | 2017-02-22 | [
[
"Letizia",
"Marco",
""
],
[
"Liberati",
"Stefano",
""
]
] | A spacetime interpretation of deformed relativity symmetry groups was recently proposed by resorting to Finslerian geometries, seen as the outcome of a continuous limit endowed with first order corrections from the quantum gravity regime. In this work we further investigate such connection between deformed algebras and... |
1511.08263 | Carlos Alex Souza da Silva Dr | M.B. Cruz, C.A.S. Silva and F.A. Brito | Gravitational axial perturbations and quasinormal modes of loop quantum
black holes | Accepted for publication in EPJC | Eur. Phys. J. C (2019) 79: 157 | 10.1140/epjc/s10052-019-6565-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Loop Quantum Gravity (LQG) is a theory that proposes a way to model the
behavior of the spacetime in situations where its atomic characteristic arises.
Among these situations, the spacetime behavior near the Big Bang or black
hole's singularity. The detection of gravitational waves, on the other hand,
has opened the ... | [
{
"created": "Thu, 26 Nov 2015 01:10:29 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Aug 2017 14:56:48 GMT",
"version": "v2"
},
{
"created": "Thu, 7 Mar 2019 02:34:34 GMT",
"version": "v3"
}
] | 2019-03-08 | [
[
"Cruz",
"M. B.",
""
],
[
"Silva",
"C. A. S.",
""
],
[
"Brito",
"F. A.",
""
]
] | Loop Quantum Gravity (LQG) is a theory that proposes a way to model the behavior of the spacetime in situations where its atomic characteristic arises. Among these situations, the spacetime behavior near the Big Bang or black hole's singularity. The detection of gravitational waves, on the other hand, has opened the wa... |
2308.00976 | Wei Zeng | Wei Zeng, Yi Ling, Qing-Quan Jiang, Guo-Ping Li | Accretion Disk for regular black holes with sub-Planckian curvature | 26 pages,9 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We investigate the accretion disk for a sort of regular black holes which are
characterized by sub-Planckian curvature and Minkowskian core. We derive null
geodesics outside the horizon of such regular black holes and analyze the
feature of the light rays from the accretion disk which can be classified into
direct em... | [
{
"created": "Wed, 2 Aug 2023 07:15:18 GMT",
"version": "v1"
}
] | 2023-08-03 | [
[
"Zeng",
"Wei",
""
],
[
"Ling",
"Yi",
""
],
[
"Jiang",
"Qing-Quan",
""
],
[
"Li",
"Guo-Ping",
""
]
] | We investigate the accretion disk for a sort of regular black holes which are characterized by sub-Planckian curvature and Minkowskian core. We derive null geodesics outside the horizon of such regular black holes and analyze the feature of the light rays from the accretion disk which can be classified into direct emis... |
1410.0792 | Bert Schroer | Bert Schroer | A Hilbert Space setting for higher spin interactions which replaces
Gauge Theory | 26 pages, additional results, special emphasis on results from
Hilbert space positivity which go beyond indefinite metric gauge theory | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recently discovered Hilbert space description of renormalizable
interactions of higher spin (equal or bigger than 1) fields requires to replace
the pointlocal s=1 vectorpotentials of indefinite metric (Krein space) BRST
gauge theory by their stringlike counterpart in Hilbert space. It is shown that
the Hilbert sp... | [
{
"created": "Fri, 3 Oct 2014 09:36:10 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Oct 2014 17:12:23 GMT",
"version": "v2"
},
{
"created": "Wed, 29 Oct 2014 14:18:42 GMT",
"version": "v3"
},
{
"created": "Wed, 12 Nov 2014 09:27:50 GMT",
"version": "v4"
}
] | 2014-11-13 | [
[
"Schroer",
"Bert",
""
]
] | The recently discovered Hilbert space description of renormalizable interactions of higher spin (equal or bigger than 1) fields requires to replace the pointlocal s=1 vectorpotentials of indefinite metric (Krein space) BRST gauge theory by their stringlike counterpart in Hilbert space. It is shown that the Hilbert spac... |
gr-qc/0409040 | C\'edric Leygnac | C\'edric Leygnac | Non-asymptotically flat black holes/branes | Ph. D. thesis, in french, 132 pages, 16 eps figures | null | null | LAPTH-these-1060/04 | gr-qc hep-th | null | In the framework of string-inspired dilatonic gravity theories (from 4 to $D$
space-time dimensions), we construct new non-asymptotically flat black hole or
black brane solutions. For particular values of the dilatonic coupling
constant, we generalize static solutions to rotating ones, using the target
space isometry... | [
{
"created": "Thu, 9 Sep 2004 09:00:43 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Leygnac",
"Cédric",
""
]
] | In the framework of string-inspired dilatonic gravity theories (from 4 to $D$ space-time dimensions), we construct new non-asymptotically flat black hole or black brane solutions. For particular values of the dilatonic coupling constant, we generalize static solutions to rotating ones, using the target space isometry g... |
2103.14725 | Brandon Mattingly | Brandon Mattingly | Curvature Invariants for Wormholes and Warped Spacetimes | 137 pages, 45 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The Carminati and McLenaghan (CM) curvature invariants are powerful tools for
probing spacetimes. Henry et al. formulated a method of plotting the CM
curvature invariants to study black holes. The CM curvature invariants are
scalar functions of the underlying spacetime. Consequently, they are
independent of the chose... | [
{
"created": "Fri, 26 Mar 2021 20:38:08 GMT",
"version": "v1"
}
] | 2021-03-30 | [
[
"Mattingly",
"Brandon",
""
]
] | The Carminati and McLenaghan (CM) curvature invariants are powerful tools for probing spacetimes. Henry et al. formulated a method of plotting the CM curvature invariants to study black holes. The CM curvature invariants are scalar functions of the underlying spacetime. Consequently, they are independent of the chosen ... |
2101.03865 | Parth Bambhaniya | Parth Bambhaniya, Dipanjan Dey, Ashok B. Joshi, Pankaj S. Joshi,
Divyesh N. Solanki, Aadarsh Mehta | Shadows and negative precession in non-Kerr spacetime | 13 pages, 20 figures | Phys. Rev. D 103, 084005 (2021) | 10.1103/PhysRevD.103.084005 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | It is now known that the shadow is not only the property of a black hole, it
can also be cast by other compact objects like naked singularities. However,
there exist some novel features of the shadow of the naked singularities which
are elaborately discussed in some recent articles. In the earlier literature,
it is a... | [
{
"created": "Mon, 11 Jan 2021 13:26:26 GMT",
"version": "v1"
}
] | 2021-04-14 | [
[
"Bambhaniya",
"Parth",
""
],
[
"Dey",
"Dipanjan",
""
],
[
"Joshi",
"Ashok B.",
""
],
[
"Joshi",
"Pankaj S.",
""
],
[
"Solanki",
"Divyesh N.",
""
],
[
"Mehta",
"Aadarsh",
""
]
] | It is now known that the shadow is not only the property of a black hole, it can also be cast by other compact objects like naked singularities. However, there exist some novel features of the shadow of the naked singularities which are elaborately discussed in some recent articles. In the earlier literature, it is als... |
gr-qc/0404092 | Bela Szilagyi | Maria Babiuc, Bela Szilagyi, Jeffrey Winicour | Some mathematical problems in numerical relativity | 17 pages, 12 graphs (eps format) | Lect.Notes Phys.692:251-274,2006 | 10.1007/11550259_12 | null | gr-qc | null | The main goal of numerical relativity is the long time simulation of highly
nonlinear spacetimes that cannot be treated by perturbation theory. This
involves analytic, computational and physical issues. At present, the major
impasses to achieving global simulations of physical usefulness are of an
analytic/computatio... | [
{
"created": "Wed, 21 Apr 2004 19:56:48 GMT",
"version": "v1"
}
] | 2011-04-21 | [
[
"Babiuc",
"Maria",
""
],
[
"Szilagyi",
"Bela",
""
],
[
"Winicour",
"Jeffrey",
""
]
] | The main goal of numerical relativity is the long time simulation of highly nonlinear spacetimes that cannot be treated by perturbation theory. This involves analytic, computational and physical issues. At present, the major impasses to achieving global simulations of physical usefulness are of an analytic/computationa... |
1401.3054 | Jing-Bo Wang | Jingbo Wang | The Entropy of BTZ Black Hole from Loop Quantum Gravity | 12 page | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we calculated the entropy of the BTZ black hole in the
framework of loop quantum gravity. We got the result that the horizon degrees
of freedom can be described by the 2D SO(1,1) punctured BF theory. Finally we
got the area law for the entropy of BTZ black hole.
| [
{
"created": "Tue, 14 Jan 2014 02:40:55 GMT",
"version": "v1"
}
] | 2014-01-15 | [
[
"Wang",
"Jingbo",
""
]
] | In this paper, we calculated the entropy of the BTZ black hole in the framework of loop quantum gravity. We got the result that the horizon degrees of freedom can be described by the 2D SO(1,1) punctured BF theory. Finally we got the area law for the entropy of BTZ black hole. |
1104.4662 | Peter K.F. Kuhfittig | Peter K. F. Kuhfittig | On the feasibility of charged wormholes | 6 pages, 1 figure | Cent. Eur. J. Phys., vol. 9, 1144 (2011) | 10.2478/s11534-011-0043-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | While wormhole spacetimes are predictions of the general theory of
relativity, specific solutions may not be compatible with quantum field theory.
This paper modifies the charged wormhole model of Kim and Lee with the aim of
satisfying an extended version of a quantum inequality due to Ford and Roman.
The modified me... | [
{
"created": "Sun, 24 Apr 2011 22:19:22 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Jun 2011 14:44:06 GMT",
"version": "v2"
},
{
"created": "Tue, 20 Dec 2011 00:33:41 GMT",
"version": "v3"
}
] | 2015-05-28 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | While wormhole spacetimes are predictions of the general theory of relativity, specific solutions may not be compatible with quantum field theory. This paper modifies the charged wormhole model of Kim and Lee with the aim of satisfying an extended version of a quantum inequality due to Ford and Roman. The modified metr... |
gr-qc/0009082 | Tekin Dereli | T. Dereli, O. Sarioglu (METU, Ankara) | Topologically massive gravity and black holes in three dimensions | 4 pages REVTEX file, no figures | null | null | null | gr-qc | null | We obtain a general class of exact solutions to topologically massive gravity
with or without a negative cosmological constant. In the first case, we show
that the solution is supersymmetric and asymptotically approaches the extremal
BTZ black hole solution, while in the latter case it goes to flat space-time.
| [
{
"created": "Mon, 25 Sep 2000 11:30:15 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dereli",
"T.",
"",
"METU, Ankara"
],
[
"Sarioglu",
"O.",
"",
"METU, Ankara"
]
] | We obtain a general class of exact solutions to topologically massive gravity with or without a negative cosmological constant. In the first case, we show that the solution is supersymmetric and asymptotically approaches the extremal BTZ black hole solution, while in the latter case it goes to flat space-time. |
1110.0079 | Manuel Rodrigues | Glauber Tadaiesky Marques, Manuel E. Rodrigues | Equivalence of the Hawking temperature in conformal frames | 21 pages | Eur. Phys. J. C 72: 1891 (2012) | 10.1140/epjc/s10052-012-1891-7 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The conformal invariance of the Hawking temperature, conjectured for the
asymptotically flat and stationary black holes by Jacobson and Kang, is
semiclassically evaluated for a simple particular case of symmetrical
spherically and non asymptotically flat black hole. By using the Bogoliubov
coefficients, the metric eu... | [
{
"created": "Sat, 1 Oct 2011 06:30:44 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Oct 2011 19:22:16 GMT",
"version": "v2"
}
] | 2015-03-13 | [
[
"Marques",
"Glauber Tadaiesky",
""
],
[
"Rodrigues",
"Manuel E.",
""
]
] | The conformal invariance of the Hawking temperature, conjectured for the asymptotically flat and stationary black holes by Jacobson and Kang, is semiclassically evaluated for a simple particular case of symmetrical spherically and non asymptotically flat black hole. By using the Bogoliubov coefficients, the metric eucl... |
0804.3322 | Jonathan R. Gair | Jonathan R. Gair, Edward K. Porter, Stanislav Babak, Leor Barack | A Constrained Metropolis-Hastings Search for EMRIs in the Mock LISA Data
Challenge 1B | 13 pages, 3 figures, to be published in proceedings of the 12th
Gravitational Wave Data Analysis Workshop; v2 has minor changes for
consistency with accepted version | Class.Quant.Grav.25:184030,2008 | 10.1088/0264-9381/25/18/184030 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a search for the extreme-mass-ratio inspiral sources in the Round
1B Mock LISA Data Challenge data sets. The search algorithm is a Monte-Carlo
search based on the Metropolis-Hastings algorithm, but also incorporates
simulated, thermostated and time annealing, plus a harmonic identification
stage designed ... | [
{
"created": "Mon, 21 Apr 2008 14:30:02 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Jul 2008 14:40:45 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Gair",
"Jonathan R.",
""
],
[
"Porter",
"Edward K.",
""
],
[
"Babak",
"Stanislav",
""
],
[
"Barack",
"Leor",
""
]
] | We describe a search for the extreme-mass-ratio inspiral sources in the Round 1B Mock LISA Data Challenge data sets. The search algorithm is a Monte-Carlo search based on the Metropolis-Hastings algorithm, but also incorporates simulated, thermostated and time annealing, plus a harmonic identification stage designed to... |
gr-qc/0101080 | Luca Bombelli | Luca Bombelli | Statistical geometry of random weave states | 10 pages, LaTeX, submitted to the Proceedings of the IX Marcel
Grossmann Meeting, Rome, July 2-8, 2000 | null | 10.1142/9789812777386_0217 | null | gr-qc | null | I describe the first steps in the construction of semiclassical states for
non-perturbative canonical quantum gravity using ideas from classical,
Riemannian statistical geometry and results from quantum geometry of spin
network states. In particular, I concentrate on how those techniques are
applied to the constructi... | [
{
"created": "Fri, 19 Jan 2001 05:10:15 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Bombelli",
"Luca",
""
]
] | I describe the first steps in the construction of semiclassical states for non-perturbative canonical quantum gravity using ideas from classical, Riemannian statistical geometry and results from quantum geometry of spin network states. In particular, I concentrate on how those techniques are applied to the construction... |
1512.07659 | Francisco Lobo | Francisco S. N. Lobo, Prado Mart\'in-Moruno, Nadiezhda
Montelongo-Garc\'ia, Matt Visser | Novel stability approach of thin-shell gravastars | 6 pages; contribution to the proceedings of the "The Fourteenth
Marcel Grossmann Meeting on General Relativity", University of Rome "La
Sapienza", Rome, July 12-18, 2015, based on an invited talk delivered at the
BS1-"Black Hole foils, Boson stars" parallel session | null | null | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop an extremely general and robust framework that can be adapted to
wide classes of generic spherically symmetric thin-shell gravastars. The thin
shell (transition layer) will be permitted to move freely in the bulk
spacetimes, permitting a fully dynamic analysis. This will then allow us to
perform a general ... | [
{
"created": "Wed, 23 Dec 2015 23:08:14 GMT",
"version": "v1"
}
] | 2015-12-25 | [
[
"Lobo",
"Francisco S. N.",
""
],
[
"Martín-Moruno",
"Prado",
""
],
[
"Montelongo-García",
"Nadiezhda",
""
],
[
"Visser",
"Matt",
""
]
] | We develop an extremely general and robust framework that can be adapted to wide classes of generic spherically symmetric thin-shell gravastars. The thin shell (transition layer) will be permitted to move freely in the bulk spacetimes, permitting a fully dynamic analysis. This will then allow us to perform a general st... |
2111.03066 | V H Satheeshkumar | V. H. Satheeshkumar | Nature of Singularities in Vector-Tensor Theories of Gravity | 9 pages, Invited parallel session talk at MG16, to appear in the
Proceedings of the Sixteenth Marcel Grossmann Meeting | The Sixteenth Marcel Grossmann Meeting, pp. 1095-1103 (2023) | 10.1142/9789811269776_0086 | null | gr-qc astro-ph.CO astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | The Vector-Tensor (VT) theories of gravity are a class of alternative
theories to General Relativity (GR) that are characterized by the presence of a
dynamical vector field besides the metric. They are studied in attempts to
understand spontaneous Lorentz violation, to generate massive gravitons, and as
models of dar... | [
{
"created": "Thu, 4 Nov 2021 16:41:20 GMT",
"version": "v1"
}
] | 2023-01-31 | [
[
"Satheeshkumar",
"V. H.",
""
]
] | The Vector-Tensor (VT) theories of gravity are a class of alternative theories to General Relativity (GR) that are characterized by the presence of a dynamical vector field besides the metric. They are studied in attempts to understand spontaneous Lorentz violation, to generate massive gravitons, and as models of dark ... |
2211.10394 | Michael Hobson | Michael Hobson | New form of the Kerr-Newman solution | 4 pages, no figures, accepted as a Letter by PRD. Contains minor
updates to match accepted version | null | 10.1103/PhysRevD.107.L021501 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new form of the Kerr-Newman solution is presented. The solution involves a
time coordinate which represents the local proper time for a charged massive
particle released from rest at spatial infinity. The chosen coordinates ensure
that the solution is well-behaved at horizons and enable an intuitive
description of ... | [
{
"created": "Fri, 18 Nov 2022 17:52:06 GMT",
"version": "v1"
},
{
"created": "Sat, 21 Jan 2023 13:54:19 GMT",
"version": "v2"
}
] | 2023-02-15 | [
[
"Hobson",
"Michael",
""
]
] | A new form of the Kerr-Newman solution is presented. The solution involves a time coordinate which represents the local proper time for a charged massive particle released from rest at spatial infinity. The chosen coordinates ensure that the solution is well-behaved at horizons and enable an intuitive description of ma... |
2206.13744 | Yehui Hou | Yehui Hou, Zhenyu Zhang, Haopeng Yan, Minyong Guo, Bin Chen | Image of Kerr-Melvin black hole with thin accretion disk | 24 pages, 10 figures | Phys.Rev.D 106,064058 (2022) | 10.1103/PhysRevD.106.064058 | null | gr-qc astro-ph.HE | http://creativecommons.org/publicdomain/zero/1.0/ | In this present work, we study the observational appearance of Kerr-Melvin
black hole (KMBH) illuminated by an accretion disk. The accretion disk is
assumed to be located on the equatorial plane and be thin both geometrically
and optically. Considering the fact that outside the innermost stable circular
orbit (ISCO) ... | [
{
"created": "Tue, 28 Jun 2022 04:03:39 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Sep 2022 15:56:34 GMT",
"version": "v2"
},
{
"created": "Tue, 4 Oct 2022 10:31:24 GMT",
"version": "v3"
}
] | 2022-10-05 | [
[
"Hou",
"Yehui",
""
],
[
"Zhang",
"Zhenyu",
""
],
[
"Yan",
"Haopeng",
""
],
[
"Guo",
"Minyong",
""
],
[
"Chen",
"Bin",
""
]
] | In this present work, we study the observational appearance of Kerr-Melvin black hole (KMBH) illuminated by an accretion disk. The accretion disk is assumed to be located on the equatorial plane and be thin both geometrically and optically. Considering the fact that outside the innermost stable circular orbit (ISCO) th... |
gr-qc/0611149 | Daniel Barraco | A.J.Bustelo and D.E.Barraco | Equilibrium hydrostatic equation and Newtonian limit of the singular
f(R) gravity | Revised version, to appear in Classical and Quantum Gravity. | Class.Quant.Grav.24:2333-2342,2007 | 10.1088/0264-9381/24/9/011 | null | gr-qc astro-ph hep-th | null | We derive the equilibrium hydrostatic equation of a spherical star for any
gravitational Lagrangian density of the form $L=\sqrt{-g}f(R)$. The Palatini
variational principle for the Helmholtz Lagrangian in the Einstein gauge is
used to obtain the field equations in this gauge. The equilibrium hydrostatic
equation is ... | [
{
"created": "Tue, 28 Nov 2006 21:26:31 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Apr 2007 16:39:27 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bustelo",
"A. J.",
""
],
[
"Barraco",
"D. E.",
""
]
] | We derive the equilibrium hydrostatic equation of a spherical star for any gravitational Lagrangian density of the form $L=\sqrt{-g}f(R)$. The Palatini variational principle for the Helmholtz Lagrangian in the Einstein gauge is used to obtain the field equations in this gauge. The equilibrium hydrostatic equation is ob... |
0812.0420 | Ertan G\"okl\"u | H.-P. Breuer, E. G\"okl\"u and C. L\"ammerzahl | Metric fluctuations and decoherence | 7 pages | null | 10.1088/0264-9381/26/10/105012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently a model of metric fluctuations has been proposed which yields an
effective Schr\"odinger equation for a quantum particle with a modified
inertial mass, leading to a violation of the weak equivalence principle. The
renormalization of the inertial mass tensor results from a local space average
over the fluctua... | [
{
"created": "Tue, 2 Dec 2008 03:20:10 GMT",
"version": "v1"
}
] | 2015-06-26 | [
[
"Breuer",
"H. -P.",
""
],
[
"Göklü",
"E.",
""
],
[
"Lämmerzahl",
"C.",
""
]
] | Recently a model of metric fluctuations has been proposed which yields an effective Schr\"odinger equation for a quantum particle with a modified inertial mass, leading to a violation of the weak equivalence principle. The renormalization of the inertial mass tensor results from a local space average over the fluctuati... |
2009.01051 | Paolo Aschieri | Paolo Aschieri, Andrzej Borowiec, Anna Pacho{\l} | Dispersion Relations in $\kappa$-Noncommutative Cosmology | 20 pages. New version: 23 pages, added 4-dim. dispersion relations
and numerical estimates | null | 10.1088/1475-7516/2021/04/025 | null | gr-qc astro-ph.HE hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study noncommutative deformations of the wave equation in curved
backgrounds and discuss the modification of the dispersion relations due to
noncommutativity combined with curvature of spacetime. Our noncommutative
differential geometry approach is based on Drinfeld twist deformation, and can
be implemented for an... | [
{
"created": "Wed, 2 Sep 2020 13:25:31 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Feb 2021 11:48:42 GMT",
"version": "v2"
}
] | 2021-04-14 | [
[
"Aschieri",
"Paolo",
""
],
[
"Borowiec",
"Andrzej",
""
],
[
"Pachoł",
"Anna",
""
]
] | We study noncommutative deformations of the wave equation in curved backgrounds and discuss the modification of the dispersion relations due to noncommutativity combined with curvature of spacetime. Our noncommutative differential geometry approach is based on Drinfeld twist deformation, and can be implemented for any ... |
1710.07597 | Paul Klinger | Piotr T. Chru\'sciel, Erwann Delay, Paul Klinger | On non-degeneracy of Riemannian Schwarzschild-anti de Sitter metrics | 40 pages, 2 figures, v2: minor updates and corrections | null | null | UWThPh-2017-30 | gr-qc hep-th math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove that the $TT$-gauge-fixed linearised Einstein operator is
non-degenerate for Riemannian Kottler ("Schwarzschild-anti de Sitter") metrics
with dimension- and topology-dependent ranges of mass parameter. We provide
evidence that this remains true for all such metrics except the spherical ones
with a critical m... | [
{
"created": "Fri, 20 Oct 2017 16:22:58 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Jun 2019 10:44:43 GMT",
"version": "v2"
}
] | 2019-06-27 | [
[
"Chruściel",
"Piotr T.",
""
],
[
"Delay",
"Erwann",
""
],
[
"Klinger",
"Paul",
""
]
] | We prove that the $TT$-gauge-fixed linearised Einstein operator is non-degenerate for Riemannian Kottler ("Schwarzschild-anti de Sitter") metrics with dimension- and topology-dependent ranges of mass parameter. We provide evidence that this remains true for all such metrics except the spherical ones with a critical mas... |
1007.4995 | Muhammad Sharif | M. Sharif and Wajiha Javed | Quantum Corrections for a Bardeen Regular Black Hole | 14 pages, accepted for publication in J. Korean Phys. Soc | J. Korean Phys. Soc.57:217-222, 2010 | 10.3938/jkps.57.217 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the quantum corrections to the thermodynamical
quantities (temperature and entropy) for a Bardeen charged regular black hole
by using a quantum tunneling approach over semiclassical approximations. Taking
into account the quantum effects, the semiclassical Bekenstein-Hawking
temperature and th... | [
{
"created": "Tue, 27 Jul 2010 04:04:17 GMT",
"version": "v1"
}
] | 2015-05-19 | [
[
"Sharif",
"M.",
""
],
[
"Javed",
"Wajiha",
""
]
] | In this paper, we study the quantum corrections to the thermodynamical quantities (temperature and entropy) for a Bardeen charged regular black hole by using a quantum tunneling approach over semiclassical approximations. Taking into account the quantum effects, the semiclassical Bekenstein-Hawking temperature and the ... |
gr-qc/9706028 | Sergei Chervon | S.V.Chervon | Gravitational Field of the Early Universe: I.Non-linear Scalar Field as
the Source | 6 pages, Latex, submitted to: Grav. and Cosmol | Grav.Cosmol. 3 (1997) 145-150 | null | RGS-USU-97/01 | gr-qc | null | In this review article we consider three most important sources of the
gravitational field of the Early Universe: self-interacting scalar field,
chiral field and gauge field. The correspondence between all of them are
pointed out. More attention is payed to nonlinear scalar field source of
gravity. The progress in fi... | [
{
"created": "Tue, 10 Jun 1997 20:50:10 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Chervon",
"S. V.",
""
]
] | In this review article we consider three most important sources of the gravitational field of the Early Universe: self-interacting scalar field, chiral field and gauge field. The correspondence between all of them are pointed out. More attention is payed to nonlinear scalar field source of gravity. The progress in find... |
2106.16123 | Hao-Jui Kuan | Hao-Jui Kuan, Arthur G. Suvorov, Kostas D. Kokkotas | General-relativistic treatment of tidal $g$-mode resonances in
coalescing binaries of neutron stars. I. Theoretical framework and crust
breaking | 15 pages, 11 figures, 2 tables. Matches published version in MNRAS | null | 10.1093/mnras/stab1898 | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | During the final stages of a neutron-star binary coalescence, stellar
quasi-normal modes can become resonantly excited by tidal fields. If the strain
exerted by the excited modes exceeds the extent to which the crust can respond
linearly, localised crustal failures may occur. In this work, we re-examine
resonant $g$-... | [
{
"created": "Wed, 30 Jun 2021 15:20:39 GMT",
"version": "v1"
}
] | 2021-07-14 | [
[
"Kuan",
"Hao-Jui",
""
],
[
"Suvorov",
"Arthur G.",
""
],
[
"Kokkotas",
"Kostas D.",
""
]
] | During the final stages of a neutron-star binary coalescence, stellar quasi-normal modes can become resonantly excited by tidal fields. If the strain exerted by the excited modes exceeds the extent to which the crust can respond linearly, localised crustal failures may occur. In this work, we re-examine resonant $g$-mo... |
1805.02565 | Mauricio Bellini Prof. | Juan Ignacio Musmarra, Mariano Anabitarte, Mauricio Bellini (IFIMAR -
CONICET & UNMdP) | Inflationary expansion of the universe with variable timescale | Version accepted in Eur. Phys. J. C | null | 10.1140/epjc/s10052-018-6526-1 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore a cosmological model in which the time scale is variable with the
expansion of the universe and the effective spacetime is driven by the inflaton
field. An example is considered and their predictions are contrasted between
Planck 2018 data. We calculate the spectrum indices and the slow-rolling
parameters ... | [
{
"created": "Mon, 7 May 2018 15:17:13 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Jul 2018 15:49:02 GMT",
"version": "v2"
},
{
"created": "Mon, 10 Sep 2018 20:41:48 GMT",
"version": "v3"
},
{
"created": "Wed, 19 Sep 2018 15:22:12 GMT",
"version": "v4"
},
{
"cre... | 2019-01-30 | [
[
"Musmarra",
"Juan Ignacio",
"",
"IFIMAR -\n CONICET & UNMdP"
],
[
"Anabitarte",
"Mariano",
"",
"IFIMAR -\n CONICET & UNMdP"
],
[
"Bellini",
"Mauricio",
"",
"IFIMAR -\n CONICET & UNMdP"
]
] | We explore a cosmological model in which the time scale is variable with the expansion of the universe and the effective spacetime is driven by the inflaton field. An example is considered and their predictions are contrasted between Planck 2018 data. We calculate the spectrum indices and the slow-rolling parameters of... |
gr-qc/0306025 | Dr Mayeul Arminjon | Mayeul Arminjon | Point-particle limit in a scalar theory of gravitation and the weak
equivalence principle | LaTeX, 6 pages. Text of a talk given at the Rencontres de Moriond:
Gravitational Waves and Experimental Gravity, Les Arcs, France (March 22-29,
2003). Submitted to the Proceedings (J. Dumarchez, ed.) | Gravitational waves and experimental gravity, Proc. of the 38th
Rencontres de Moriond (J. Dumarchez & J. Tran Thanh Van, eds.), The Gioi,
Hanoi (2004), pp. 377-382 | null | null | gr-qc | null | A scalar theory with a preferred reference frame is summarized. To test that
theory in celestial mechanics, an "asymptotic" post-Newtonian (PN) scheme has
been developed. This associates a conceptual family of self-gravitating systems
with the given system, in order to have a true small parameter available. The
resul... | [
{
"created": "Fri, 6 Jun 2003 13:11:22 GMT",
"version": "v1"
}
] | 2007-11-19 | [
[
"Arminjon",
"Mayeul",
""
]
] | A scalar theory with a preferred reference frame is summarized. To test that theory in celestial mechanics, an "asymptotic" post-Newtonian (PN) scheme has been developed. This associates a conceptual family of self-gravitating systems with the given system, in order to have a true small parameter available. The resulti... |
1712.09703 | Vladimir Ivashchuk | V. D. Ivashchuk and A.A. Kobtsev | Stable exponential cosmological solutions with two factor spaces in the
Einstein-Gauss-Bonnet model with a $\Lambda$-term | 37 pages, Latex, 8 figures, 42 references. One typo in eq. (3.77) is
eliminated, one phrase in Introduction and the last reference are omitted. To
be published in GERG | null | 10.1007/s10714-018-2447-4 | IGC-RUDN-18-06/02a-cor | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study $D$-dimensional Einstein-Gauss-Bonnet gravitational model including
the Gauss-Bonnet term and the cosmological term $\Lambda$. We find a class of
solutions with exponential time dependence of two scale factors, governed by
two Hubble-like parameters $H >0$ and $h$, corresponding to factor spaces of
dimension... | [
{
"created": "Wed, 27 Dec 2017 23:01:01 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Apr 2018 15:32:59 GMT",
"version": "v2"
},
{
"created": "Fri, 8 Jun 2018 21:13:57 GMT",
"version": "v3"
},
{
"created": "Mon, 3 Sep 2018 17:14:55 GMT",
"version": "v4"
}
] | 2018-09-05 | [
[
"Ivashchuk",
"V. D.",
""
],
[
"Kobtsev",
"A. A.",
""
]
] | We study $D$-dimensional Einstein-Gauss-Bonnet gravitational model including the Gauss-Bonnet term and the cosmological term $\Lambda$. We find a class of solutions with exponential time dependence of two scale factors, governed by two Hubble-like parameters $H >0$ and $h$, corresponding to factor spaces of dimensions ... |
2011.08859 | T. Padmanabhan | T. Padmanabhan | Gravitational effective action at mesoscopic scales from the quantum
microstructure of spacetime | ver 2: minor edits; no figures; 9 pages | Phys. Letts., B 814 136109 (2021) | 10.1016/j.physletb.2021.136109 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | At mesoscopic scales, the quantum corrected field equations of gravity should
arise from extremizing, $\Omega$, the number of microscopic configurations of
pre-geometric variables consistent with a given geometry. This $\Omega$, in
turn, is the product over all events P of the density, $\rho(P)$, of
microscopic confi... | [
{
"created": "Tue, 17 Nov 2020 19:00:01 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Feb 2021 14:46:58 GMT",
"version": "v2"
}
] | 2021-02-08 | [
[
"Padmanabhan",
"T.",
""
]
] | At mesoscopic scales, the quantum corrected field equations of gravity should arise from extremizing, $\Omega$, the number of microscopic configurations of pre-geometric variables consistent with a given geometry. This $\Omega$, in turn, is the product over all events P of the density, $\rho(P)$, of microscopic configu... |
gr-qc/0301062 | Ulises Nucamendi | Ulises Nucamendi and Marcelo Salgado | Scalar hairy black holes and solitons in asymptotically flat spacetimes | 7 pages, 10 postscript figures, file tex, new postscript figs. and
references added, stability analysis revisited | Phys.Rev. D68 (2003) 044026 | 10.1103/PhysRevD.68.044026 | null | gr-qc hep-th | null | A numerical analysis shows that a class of scalar-tensor theories of gravity
with a scalar field minimally and nonminimally coupled to the curvature allows
static and spherically symmetric black hole solutions with scalar-field hair in
asymptotically flat spacetimes. In the limit when the horizon radius of the
black ... | [
{
"created": "Fri, 17 Jan 2003 04:12:43 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Mar 2003 00:47:24 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Nucamendi",
"Ulises",
""
],
[
"Salgado",
"Marcelo",
""
]
] | A numerical analysis shows that a class of scalar-tensor theories of gravity with a scalar field minimally and nonminimally coupled to the curvature allows static and spherically symmetric black hole solutions with scalar-field hair in asymptotically flat spacetimes. In the limit when the horizon radius of the black ho... |
1408.4531 | Hamed Pejhan | Hamed Pejhan and Surena Rahbardehghan | Examining a covariant and renormalizable quantum field theory in de
Sitter space by studying "black hole radiation" | 8 pages, published version | Int. J. Mod. Phys. A 31, 1650052 (2016) | 10.1142/S0217751X16500524 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Respecting that any consistent quantum field theory in curved space-time must
include black hole radiation, in this paper, we examine the Krein-Gupta-Bleuler
(KGB) formalism as an inevitable quantization scheme in order to follow the
guideline of the covariance of minimally coupled massless scalar field and
linear gr... | [
{
"created": "Wed, 20 Aug 2014 06:06:06 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Aug 2014 10:56:04 GMT",
"version": "v2"
},
{
"created": "Mon, 5 Jan 2015 13:55:22 GMT",
"version": "v3"
},
{
"created": "Wed, 7 Jan 2015 09:29:50 GMT",
"version": "v4"
},
{
"cre... | 2018-08-14 | [
[
"Pejhan",
"Hamed",
""
],
[
"Rahbardehghan",
"Surena",
""
]
] | Respecting that any consistent quantum field theory in curved space-time must include black hole radiation, in this paper, we examine the Krein-Gupta-Bleuler (KGB) formalism as an inevitable quantization scheme in order to follow the guideline of the covariance of minimally coupled massless scalar field and linear grav... |
2209.06938 | Eduardo Velasco-Aja | Eduardo Velasco-Aja and Jesus Anero | Quantum corrections to Einstein's equations | 39 pages | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this master thesis, the Frobenius power series method is used to find
spherically symmetric and static vacuum solutions to quadratic and cubic
gravitational actions, representing quantum corrections to the Einstein-Hilbert
action. After a motivation to the topic and an introduction, the power series
solutions are ... | [
{
"created": "Wed, 14 Sep 2022 21:20:43 GMT",
"version": "v1"
}
] | 2022-09-16 | [
[
"Velasco-Aja",
"Eduardo",
""
],
[
"Anero",
"Jesus",
""
]
] | In this master thesis, the Frobenius power series method is used to find spherically symmetric and static vacuum solutions to quadratic and cubic gravitational actions, representing quantum corrections to the Einstein-Hilbert action. After a motivation to the topic and an introduction, the power series solutions are pr... |
2309.06002 | Ioannis Soranidis | Sebastian Murk and Ioannis Soranidis | Kinematic and energy properties of dynamical regular black holes | 13 pages, 6 figures. Published version. Comments welcome! | Phys. Rev. D 108, 124007 (2023) | 10.1103/PhysRevD.108.124007 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Nonsingular black holes have received much attention in recent years as they
provide an opportunity to avoid the singularities inherent to the mathematical
black holes predicted by general relativity. Based on the assumption that
semiclassical physics remains valid in the vicinity of their horizons, we
derive kinemat... | [
{
"created": "Tue, 12 Sep 2023 06:58:25 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Dec 2023 05:17:44 GMT",
"version": "v2"
}
] | 2023-12-07 | [
[
"Murk",
"Sebastian",
""
],
[
"Soranidis",
"Ioannis",
""
]
] | Nonsingular black holes have received much attention in recent years as they provide an opportunity to avoid the singularities inherent to the mathematical black holes predicted by general relativity. Based on the assumption that semiclassical physics remains valid in the vicinity of their horizons, we derive kinematic... |
1610.08357 | Athanasios Bakopoulos | Athanasios Bakopoulos | Gravitoelectromagnetism: Basic principles, novel approaches and their
application to Electromagnetism | 67 pages, Master Thesis | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work is focused on the theory of Gravitoelectromagnetism (GEM). In the
first part of this work we present a brief review of gravitoelectromagnetism,
we locate and discuss all the problems which appear in this approach. We also
try to avoid these problems by proposing new approaches in which we use the
additional... | [
{
"created": "Tue, 25 Oct 2016 15:46:01 GMT",
"version": "v1"
}
] | 2016-10-27 | [
[
"Bakopoulos",
"Athanasios",
""
]
] | This work is focused on the theory of Gravitoelectromagnetism (GEM). In the first part of this work we present a brief review of gravitoelectromagnetism, we locate and discuss all the problems which appear in this approach. We also try to avoid these problems by proposing new approaches in which we use the additional d... |
gr-qc/0605155 | Scott Pollack | Scott E Pollack and Robin Tuck Stebbins | A Demonstration of LISA Laser Communication | minor corrections found in the CQG version | Class.Quant.Grav.23:4201-4213,2006 | 10.1088/0264-9381/23/12/015 | null | gr-qc | null | Over the past few years questions have been raised concerning the use of
laser communications links between sciencecraft to transmit phase information
crucial to the reduction of laser frequency noise in the LISA science
measurement. The concern is that applying medium frequency phase modulations to
the laser carrier... | [
{
"created": "Wed, 31 May 2006 19:38:55 GMT",
"version": "v1"
}
] | 2010-11-05 | [
[
"Pollack",
"Scott E",
""
],
[
"Stebbins",
"Robin Tuck",
""
]
] | Over the past few years questions have been raised concerning the use of laser communications links between sciencecraft to transmit phase information crucial to the reduction of laser frequency noise in the LISA science measurement. The concern is that applying medium frequency phase modulations to the laser carrier c... |
gr-qc/0104101 | Will Loinaz | J. B. Hertzberg, S. R. Bickman, M. T. Hummon, D. Krause, S. K. Peck
and L. R. Hunter (Amherst College) | Measurement of the Relativistic Potential Difference Across a Rotating
Dielectric Cylinder | 22 pages, 5 figures; to be published in the American Journal of
Physics | Am.J.Phys. 69 (2001) 648-654 | 10.1119/1.1362695 | null | gr-qc hep-ex | null | According to the Special Theory of Relativity, a rotating magnetic dielectric
cylinder in an axial magnetic field should exhibit a contribution to the radial
electric potential that is associated with the motion of the material's
magnetic dipoles. In 1913 Wilson and Wilson reported a measurement of the
potential diff... | [
{
"created": "Mon, 30 Apr 2001 18:03:55 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Hertzberg",
"J. B.",
"",
"Amherst College"
],
[
"Bickman",
"S. R.",
"",
"Amherst College"
],
[
"Hummon",
"M. T.",
"",
"Amherst College"
],
[
"Krause",
"D.",
"",
"Amherst College"
],
[
"Peck",
"S. K.",
"",
"Amherst Col... | According to the Special Theory of Relativity, a rotating magnetic dielectric cylinder in an axial magnetic field should exhibit a contribution to the radial electric potential that is associated with the motion of the material's magnetic dipoles. In 1913 Wilson and Wilson reported a measurement of the potential differ... |
1309.5774 | M. Hossein Dehghani | A. Sheykhi, M. H. Dehghani and S. E. Hosseini | Emergence of spacetime dynamics in entropy corrected and braneworld
models | 17 pages, Latex. arXiv admin note: text overlap with arXiv:1304.3054 | JCAP, 04 (2013) 038 | 10.1088/1475-7516/2013/04/038 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A very interesting new proposal on the origin of the cosmic expansion was
recently suggested by Padmanabhan [arXiv:1206.4916]. He argued that the
difference between the surface degrees of freedom and the bulk degrees of
freedom in a region of space drives the accelerated expansion of the universe,
as well as the stan... | [
{
"created": "Mon, 23 Sep 2013 11:37:33 GMT",
"version": "v1"
}
] | 2013-09-24 | [
[
"Sheykhi",
"A.",
""
],
[
"Dehghani",
"M. H.",
""
],
[
"Hosseini",
"S. E.",
""
]
] | A very interesting new proposal on the origin of the cosmic expansion was recently suggested by Padmanabhan [arXiv:1206.4916]. He argued that the difference between the surface degrees of freedom and the bulk degrees of freedom in a region of space drives the accelerated expansion of the universe, as well as the standa... |
1609.01540 | David Viennot | David Viennot, Olivia Moro | Adiabatic transport of qubits around a black hole | null | Class. Quant. Gravity, 34, 055005 (2017) | 10.1088/1361-6382/aa5b5c | null | gr-qc math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider localized qubits evolving around a black hole following a quantum
adiabatic dynamics. We develop a geometric structure (based on fibre bundles)
permitting to describe the quantum states of a qubit and the spacetime geometry
in a single framework. The quantum decoherence induced by the black hole on the
qu... | [
{
"created": "Tue, 6 Sep 2016 13:14:14 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Jan 2017 10:01:43 GMT",
"version": "v2"
}
] | 2017-02-13 | [
[
"Viennot",
"David",
""
],
[
"Moro",
"Olivia",
""
]
] | We consider localized qubits evolving around a black hole following a quantum adiabatic dynamics. We develop a geometric structure (based on fibre bundles) permitting to describe the quantum states of a qubit and the spacetime geometry in a single framework. The quantum decoherence induced by the black hole on the qubi... |
gr-qc/0309076 | Karasik David | D. Karasik, C. Sahabandu, P. Suranyi and L. C. R. Wijewardhana | Small Black Holes in Randall-Sundrum type I Scenario | Version published at Phys. Rev. D69:064022 (2004) | Phys.Rev. D69 (2004) 064022 | 10.1103/PhysRevD.69.064022 | null | gr-qc hep-th | null | An approximation method to study the properties of a small black hole located
on the TeV brane in the Randall-Sundrum type I scenario is presented. The
method enables us to find the form of the metric close to the matter
distribution when its asymptotic form is given. The short range solution is
found as an expansion... | [
{
"created": "Tue, 16 Sep 2003 16:23:29 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Sep 2003 20:28:29 GMT",
"version": "v2"
},
{
"created": "Wed, 24 Mar 2004 16:38:40 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Karasik",
"D.",
""
],
[
"Sahabandu",
"C.",
""
],
[
"Suranyi",
"P.",
""
],
[
"Wijewardhana",
"L. C. R.",
""
]
] | An approximation method to study the properties of a small black hole located on the TeV brane in the Randall-Sundrum type I scenario is presented. The method enables us to find the form of the metric close to the matter distribution when its asymptotic form is given. The short range solution is found as an expansion i... |
1603.03723 | Luciano Burderi Prof. | Luciano Burderi, Tiziana Di Salvo, Rosario Iaria | Quantum clock: A critical discussion on spacetime | 10 pages, published in Physical Review D | Physical Review D 93, 064017 (2016) | 10.1103/PhysRevD.93.064017 | null | gr-qc astro-ph.HE hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We critically discuss the measure of very short time intervals. By means of a
Gedankenexperiment, we describe an ideal clock based on the occurrence of
completely random events. Many previous thought experiments have suggested
fundamental Planck-scale limits on measurements of distance and time. Here we
present a new... | [
{
"created": "Fri, 11 Mar 2016 18:58:43 GMT",
"version": "v1"
}
] | 2016-03-14 | [
[
"Burderi",
"Luciano",
""
],
[
"Di Salvo",
"Tiziana",
""
],
[
"Iaria",
"Rosario",
""
]
] | We critically discuss the measure of very short time intervals. By means of a Gedankenexperiment, we describe an ideal clock based on the occurrence of completely random events. Many previous thought experiments have suggested fundamental Planck-scale limits on measurements of distance and time. Here we present a new t... |
1104.0356 | P.A. Gonzalez | Ram\'on Becar and P. A. Gonz\'alez | Hawking Radiation for Scalar and Dirac Fields in Five Dimensional
Dilatonic Black Hole via Anomalies | 10 pages | null | 10.1142/S0218271812500307 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study massive scalar fields and Dirac fields propagating in a five
dimensional dilatonic black hole background. We expose that for both fields the
physics can be describe by a two dimensional theory, near the horizon. Then, in
this limit, by applying the covariant anomalies method we find the Hawking flux
by resto... | [
{
"created": "Sun, 3 Apr 2011 05:29:50 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Sep 2011 12:57:41 GMT",
"version": "v2"
},
{
"created": "Sun, 22 Jan 2012 14:30:30 GMT",
"version": "v3"
}
] | 2015-05-27 | [
[
"Becar",
"Ramón",
""
],
[
"González",
"P. A.",
""
]
] | We study massive scalar fields and Dirac fields propagating in a five dimensional dilatonic black hole background. We expose that for both fields the physics can be describe by a two dimensional theory, near the horizon. Then, in this limit, by applying the covariant anomalies method we find the Hawking flux by restori... |
gr-qc/0305014 | David Garfinkle | David Garfinkle, Robert Mann, Chris Vuille | Critical collapse of a massive vector field | 7 pages, 4 figures | Phys.Rev. D68 (2003) 064015 | 10.1103/PhysRevD.68.064015 | null | gr-qc | null | We perform numerical simulations of the critical gravitational collapse of a
massive vector field. The result is that there are two critical solutions. One
is equivalent to the Choptuik critical solution for a massless scalar field.
The other is periodic.
| [
{
"created": "Sat, 3 May 2003 12:24:27 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Garfinkle",
"David",
""
],
[
"Mann",
"Robert",
""
],
[
"Vuille",
"Chris",
""
]
] | We perform numerical simulations of the critical gravitational collapse of a massive vector field. The result is that there are two critical solutions. One is equivalent to the Choptuik critical solution for a massless scalar field. The other is periodic. |
1605.02729 | Richard Woodard | D. J. Brooker (Florida), N. C. Tsamis (Crete) and R. P. Woodard
(Florida) | The Effect of Features on the Functional Form of the Scalar Power
Spectrum | 27 pages, 14 figures, uses LaTeX2e; version 2 contains an expanded
section 4 which explains how to compute the phase of the mode function so
that the propagator and non-Gaussianity can be derived | Phys. Rev. D 94, 044020 (2016) | 10.1103/PhysRevD.94.044020 | UFIFT-QG-16-02 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study how the scalar power spectrum of single-scalar inflation depends
functionally on models with features which have been proposed to explain
anomalies in the data. We exploit a new formalism based on evolving the
norm-squared of the scalar mode functions, rather than the mode functions
themselves.
| [
{
"created": "Mon, 9 May 2016 15:53:48 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Sep 2016 00:43:43 GMT",
"version": "v2"
}
] | 2016-09-27 | [
[
"Brooker",
"D. J.",
"",
"Florida"
],
[
"Tsamis",
"N. C.",
"",
"Crete"
],
[
"Woodard",
"R. P.",
"",
"Florida"
]
] | We study how the scalar power spectrum of single-scalar inflation depends functionally on models with features which have been proposed to explain anomalies in the data. We exploit a new formalism based on evolving the norm-squared of the scalar mode functions, rather than the mode functions themselves. |
1711.07087 | Vedad Pasic Dr | Vedad Pasic and Elvis Barakovic | Axial torsion waves in metric-affine gravity | 6 pages. Proceedings of the MG14 Meeting on General Relativity,
University of Rome "La Sapienza", Italy, 12 - 18 July 2015. Edited by:
Massimo Bianchi (Universit\`a degli Studi di Roma "Tor Vergata", Italy),
Robert T Jantzen (Villanova University, USA), Remo Ruffini (International
Center for Relativistic Astrop... | null | 10.1142/9789813226609_0080 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct new explicit vacuum solutions of quadratic metric-affine
gravity. The approach of metric-affine gravity in using an independent affine
connection produces a theory with 10+64 unknowns, which implies admitting
torsion and possible nonmetricity. Our spacetimes are generalisations of
classical pp-waves, fou... | [
{
"created": "Sun, 19 Nov 2017 21:42:52 GMT",
"version": "v1"
}
] | 2019-02-27 | [
[
"Pasic",
"Vedad",
""
],
[
"Barakovic",
"Elvis",
""
]
] | We construct new explicit vacuum solutions of quadratic metric-affine gravity. The approach of metric-affine gravity in using an independent affine connection produces a theory with 10+64 unknowns, which implies admitting torsion and possible nonmetricity. Our spacetimes are generalisations of classical pp-waves, four-... |
2305.18521 | Michael Florian Wondrak | Michael F. Wondrak, Walter D. van Suijlekom, Heino Falcke | Gravitational Pair Production and Black Hole Evaporation | 11 pages, 2 figures. To appear in Physical Review Letters | Phys. Rev. Lett. 130 (2023) 221502 | 10.1103/PhysRevLett.130.221502 | null | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new avenue to black hole evaporation using a heat-kernel
approach analogous as for the Schwinger effect. Applying this method to an
uncharged massless scalar field in a Schwarzschild spacetime, we show that
spacetime curvature takes a similar role as the electric field strength in the
Schwinger effect. W... | [
{
"created": "Mon, 29 May 2023 18:00:02 GMT",
"version": "v1"
}
] | 2023-06-05 | [
[
"Wondrak",
"Michael F.",
""
],
[
"van Suijlekom",
"Walter D.",
""
],
[
"Falcke",
"Heino",
""
]
] | We present a new avenue to black hole evaporation using a heat-kernel approach analogous as for the Schwinger effect. Applying this method to an uncharged massless scalar field in a Schwarzschild spacetime, we show that spacetime curvature takes a similar role as the electric field strength in the Schwinger effect. We ... |
1709.10155 | Lior M. Burko | Lior M. Burko and Gaurav Khanna | Linearized Stability of Extreme Black Holes | 4 pages, 4 figures | Phys. Rev. D 97, 061502 (2018) | 10.1103/PhysRevD.97.061502 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Extreme black holes have been argued to be unstable, in the sense that under
linearized gravitational perturbations of the extreme Kerr spacetime the Weyl
scalar $\psi_4$ blows up along their event horizons at very late advanced
times. We show numerically, by solving the Teukolsky equation in 2+1D, that all
algebraic... | [
{
"created": "Thu, 28 Sep 2017 20:12:52 GMT",
"version": "v1"
}
] | 2018-04-04 | [
[
"Burko",
"Lior M.",
""
],
[
"Khanna",
"Gaurav",
""
]
] | Extreme black holes have been argued to be unstable, in the sense that under linearized gravitational perturbations of the extreme Kerr spacetime the Weyl scalar $\psi_4$ blows up along their event horizons at very late advanced times. We show numerically, by solving the Teukolsky equation in 2+1D, that all algebraical... |
1911.10296 | Euclides Silva | L.A. Lessa, J.E.G. Silva, R.V. Maluf, C.A.S. Almeida | Modified black hole solution with a background Kalb-Ramond field | 9 pages. Published version | Eur. Phys. J. C 80, 335 (2020) | 10.1140/epjc/s10052-020-7902-1 | null | gr-qc hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | We study the gravitation effects on a static and spherically symmetric
spacetime due to the vacuum expectation value (VEV) of a Kalb-Ramond field. The
Kalb-Ramond VEV is a background tensor field which produces a local Lorentz
symmetry breaking (LSB) of spacetime. Considering a non-minimal coupling
between the Kalb-R... | [
{
"created": "Sat, 23 Nov 2019 01:35:26 GMT",
"version": "v1"
},
{
"created": "Sat, 30 May 2020 01:15:03 GMT",
"version": "v2"
}
] | 2020-06-02 | [
[
"Lessa",
"L. A.",
""
],
[
"Silva",
"J. E. G.",
""
],
[
"Maluf",
"R. V.",
""
],
[
"Almeida",
"C. A. S.",
""
]
] | We study the gravitation effects on a static and spherically symmetric spacetime due to the vacuum expectation value (VEV) of a Kalb-Ramond field. The Kalb-Ramond VEV is a background tensor field which produces a local Lorentz symmetry breaking (LSB) of spacetime. Considering a non-minimal coupling between the Kalb-Ram... |
1905.03272 | Bo Wang | Bo Wang, Yang Zhang | Second-order cosmological perturbations. IV. Produced by scalar-tensor
and tensor-tensor couplings during the radiation dominated stage | 79 pages, 2 figures | Phys. Rev. D 99, 123008 (2019) | 10.1103/PhysRevD.99.123008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We continue to study the 2nd-order cosmological perturbations in synchronous
coordinates in the framework of the general relativity (GR) during the
radiation dominated (RD) stage, and to focus on the scalar-tensor and
tensor-tensor couplings. The 1st-order curl velocity and the associated
1st-order vector metric pert... | [
{
"created": "Wed, 8 May 2019 18:01:24 GMT",
"version": "v1"
},
{
"created": "Tue, 28 May 2019 02:37:12 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Jun 2019 13:26:56 GMT",
"version": "v3"
}
] | 2019-06-27 | [
[
"Wang",
"Bo",
""
],
[
"Zhang",
"Yang",
""
]
] | We continue to study the 2nd-order cosmological perturbations in synchronous coordinates in the framework of the general relativity (GR) during the radiation dominated (RD) stage, and to focus on the scalar-tensor and tensor-tensor couplings. The 1st-order curl velocity and the associated 1st-order vector metric pertur... |
1701.00699 | David Edward Bruschi Dr | David Edward Bruschi | On the gravitational nature of energy | 4 Pages. No figures | null | null | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose the idea that not all energy is a source of gravity. We discuss
the role of energy in the theory of gravitation and provide a formulation of
gravity which takes into account the quantum nature of the source. We show that
gravity depends dramatically on the entanglement present between the
constituents of t... | [
{
"created": "Fri, 23 Dec 2016 12:37:26 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Feb 2017 17:20:57 GMT",
"version": "v2"
}
] | 2017-02-20 | [
[
"Bruschi",
"David Edward",
""
]
] | We propose the idea that not all energy is a source of gravity. We discuss the role of energy in the theory of gravitation and provide a formulation of gravity which takes into account the quantum nature of the source. We show that gravity depends dramatically on the entanglement present between the constituents of the... |
1906.05393 | Adria Delhom | Adria Delhom, Iarley P. Lobo, Gonzalo J. Olmo and Carlos Romero | A generalized Weyl structure with arbitrary non-metricity | 9 pages, updated to match published version, some discussions
extended | Eur. Phys. J. C 79:878 (2019) | 10.1140/epjc/s10052-019-7394-z | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A Weyl structure is usually defined by an equivalence class of pairs $({\bf
g}, \boldsymbol{\omega})$ related by Weyl transformations, which preserve the
relation $\nabla {\bf g}=\boldsymbol{\omega}\otimes{\bf g}$, where ${\bf g}$
and $\boldsymbol{\omega}$ denote the metric tensor and a 1-form field. An
equivalent wa... | [
{
"created": "Wed, 12 Jun 2019 21:41:11 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Oct 2019 19:38:59 GMT",
"version": "v2"
}
] | 2019-11-01 | [
[
"Delhom",
"Adria",
""
],
[
"Lobo",
"Iarley P.",
""
],
[
"Olmo",
"Gonzalo J.",
""
],
[
"Romero",
"Carlos",
""
]
] | A Weyl structure is usually defined by an equivalence class of pairs $({\bf g}, \boldsymbol{\omega})$ related by Weyl transformations, which preserve the relation $\nabla {\bf g}=\boldsymbol{\omega}\otimes{\bf g}$, where ${\bf g}$ and $\boldsymbol{\omega}$ denote the metric tensor and a 1-form field. An equivalent way ... |
1702.08118 | De-Cheng Zou | De-Cheng Zou, Yunqi Liu and Ruihong Yue | Behavior of quasinormal modes and Van der Waals-like phase transition of
charged AdS black holes in massive gravity | 18 pages, V3: minor corrections | Eur. Phys. J. C (2017) 77:365 | 10.1140/epjc/s10052-017-4937-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we utilize the quasinormal modes (QNMs) of a massless scalar
perturbation to probe the Van der Waals-like small and large black holes
(SBH/LBH) phase transition of charged topological Anti-de Sitter (AdS) black
holes in four-dimensional massive gravity. We find that the signature of this
SBH/LBH phase t... | [
{
"created": "Mon, 27 Feb 2017 01:05:33 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Feb 2017 07:51:13 GMT",
"version": "v2"
},
{
"created": "Sat, 3 Jun 2017 05:35:23 GMT",
"version": "v3"
}
] | 2017-06-06 | [
[
"Zou",
"De-Cheng",
""
],
[
"Liu",
"Yunqi",
""
],
[
"Yue",
"Ruihong",
""
]
] | In this work, we utilize the quasinormal modes (QNMs) of a massless scalar perturbation to probe the Van der Waals-like small and large black holes (SBH/LBH) phase transition of charged topological Anti-de Sitter (AdS) black holes in four-dimensional massive gravity. We find that the signature of this SBH/LBH phase tra... |
1803.01157 | Timothy Clifton | Timothy Clifton, Viraj A. A. Sanghai | Parametrizing theories of gravity on large and small scales in cosmology | 5 pages, 1 figure | Phys. Rev. Lett. 122, 011301 (2019) | 10.1103/PhysRevLett.122.011301 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a link between parametrizations of alternative theories of gravity
on large and small scales in cosmology. This relationship is established using
theoretical consistency conditions only. We find that in both limits the "slip"
and "effective Newton's constant" can be written in terms of a set of four
functi... | [
{
"created": "Sat, 3 Mar 2018 13:05:28 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Jan 2019 10:51:49 GMT",
"version": "v2"
}
] | 2019-01-09 | [
[
"Clifton",
"Timothy",
""
],
[
"Sanghai",
"Viraj A. A.",
""
]
] | We present a link between parametrizations of alternative theories of gravity on large and small scales in cosmology. This relationship is established using theoretical consistency conditions only. We find that in both limits the "slip" and "effective Newton's constant" can be written in terms of a set of four function... |
gr-qc/0608027 | Douglas Fregolente | Douglas Fregolente, George E. A. Matsas (Sao Paulo, IFT), Daniel A. T.
Vanzella (Sao Paulo U., Sao Carlos) | Semiclassical approach to the decay of protons in circular motion under
the influence of gravitational fields | To appear in Physical Review D | Phys.Rev. D74 (2006) 045032 | 10.1103/PhysRevD.74.045032 | null | gr-qc hep-th | null | We investigate the possible decay of protons in geodesic circular motion
around neutral compact objects. Weak and strong decay rates and the associated
emitted powers are calculated using a semi-classical approach. Our results are
discussed with respect to distinct ones in the literature, which consider the
decay of ... | [
{
"created": "Fri, 4 Aug 2006 14:14:45 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Fregolente",
"Douglas",
"",
"Sao Paulo, IFT"
],
[
"Matsas",
"George E. A.",
"",
"Sao Paulo, IFT"
],
[
"Vanzella",
"Daniel A. T.",
"",
"Sao Paulo U., Sao Carlos"
]
] | We investigate the possible decay of protons in geodesic circular motion around neutral compact objects. Weak and strong decay rates and the associated emitted powers are calculated using a semi-classical approach. Our results are discussed with respect to distinct ones in the literature, which consider the decay of ac... |
1008.0382 | Ernesto F. Eiroa | Ernesto F. Eiroa, Claudio Simeone | Brans-Dicke cylindrical wormholes | 11 pages, 3 figures; v3: corrected version, conclusions unchanged | Phys.Rev.D82:084039,2010 | 10.1103/PhysRevD.82.084039 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Static axisymmetric thin-shell wormholes are constructed within the framework
of the Brans-Dicke scalar-tensor theory of gravity. Examples of wormholes
associated with vacuum and electromagnetic fields are studied. All
constructions must be threaded by exotic matter, except in the case of
geometries with a singularit... | [
{
"created": "Mon, 2 Aug 2010 19:24:01 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Oct 2010 20:17:58 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Feb 2016 19:37:25 GMT",
"version": "v3"
}
] | 2016-02-12 | [
[
"Eiroa",
"Ernesto F.",
""
],
[
"Simeone",
"Claudio",
""
]
] | Static axisymmetric thin-shell wormholes are constructed within the framework of the Brans-Dicke scalar-tensor theory of gravity. Examples of wormholes associated with vacuum and electromagnetic fields are studied. All constructions must be threaded by exotic matter, except in the case of geometries with a singularity ... |
1806.03807 | Yen-Kheng Lim | Yen-Kheng Lim and Qing-hai Wang | Field equations and particle motion in covariant emergent gravity | New section added. Accepted for publication in Phys. Rev. D | Phys. Rev. D 98, 124029 (2018) | 10.1103/PhysRevD.98.124029 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the full set of field equations based on Hossenfelder's recent
covariant formulation of the emergent gravity model, along with perturbative
and exact solutions. The exact solution describes a static,
spherically-symmetric spacetime with a non-trivial vector field which plays the
role of dark matter under th... | [
{
"created": "Mon, 11 Jun 2018 04:55:55 GMT",
"version": "v1"
},
{
"created": "Sat, 1 Dec 2018 12:24:27 GMT",
"version": "v2"
}
] | 2018-12-26 | [
[
"Lim",
"Yen-Kheng",
""
],
[
"Wang",
"Qing-hai",
""
]
] | We derive the full set of field equations based on Hossenfelder's recent covariant formulation of the emergent gravity model, along with perturbative and exact solutions. The exact solution describes a static, spherically-symmetric spacetime with a non-trivial vector field which plays the role of dark matter under the ... |
gr-qc/9801013 | Uwe Gunther | U. Guenther, S. Kriskiv, A. Zhuk | On stable compactification with Casimir-like potential | 17 pages, Latex2e, submitted to Gravitation and Cosmology, slightly
revised Appendix B | Grav.Cosmol. 4 (1998) 1-16 | null | null | gr-qc astro-ph hep-th | null | Multidimensional cosmological models with a higher dimensional space-time
manifold are investigated under dimensional reduction. In the Einstein
conformal frame, the effective potential for the internal scale factors is
obtained. The stable compactification of the internal spaces is achieved due to
the Casimir effect... | [
{
"created": "Thu, 8 Jan 1998 00:59:08 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Jan 1998 01:57:03 GMT",
"version": "v2"
},
{
"created": "Tue, 13 Jan 1998 11:12:52 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Guenther",
"U.",
""
],
[
"Kriskiv",
"S.",
""
],
[
"Zhuk",
"A.",
""
]
] | Multidimensional cosmological models with a higher dimensional space-time manifold are investigated under dimensional reduction. In the Einstein conformal frame, the effective potential for the internal scale factors is obtained. The stable compactification of the internal spaces is achieved due to the Casimir effect. ... |
2011.13135 | Snehasish Bhattacharjee | Snehasish Bhattacharjee | Growth Rate and Configurational Entropy in Tsallis Holographic Dark
Energy | null | European Physical Journal C 81, 217 (2021) | 10.1140/epjc/s10052-021-09003-0 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | In this work, we analyzed the effect of different prescriptions of the IR
cutoffs, namely the Hubble horizon cutoff, particle horizon cutoff, Granda and
Oliveros horizon cut off, and the Ricci horizon cutoff on the growth rate of
clustering for the Tsallis holographic dark energy (THDE) model in an FRW
universe devoi... | [
{
"created": "Thu, 26 Nov 2020 05:41:11 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Mar 2021 06:12:37 GMT",
"version": "v2"
}
] | 2021-03-09 | [
[
"Bhattacharjee",
"Snehasish",
""
]
] | In this work, we analyzed the effect of different prescriptions of the IR cutoffs, namely the Hubble horizon cutoff, particle horizon cutoff, Granda and Oliveros horizon cut off, and the Ricci horizon cutoff on the growth rate of clustering for the Tsallis holographic dark energy (THDE) model in an FRW universe devoid ... |
1102.1867 | Laszlo B. Szabados | J\"org Frauendiener, L\'aszl\'o B Szabados | A note on the post-Newtonian limit of quasi-local energy expressions | final version, 12 pages, The last sentence of subsection 2.2, giving
the quasi-local energy in the relativistically corrected Newtonian theory, is
corrected | Class. Quantum Grav. vol 28 (2011) 235009, Corrigendum: Class.
Quantum Grav. vol 29 (2012) 069501 | 10.1088/0264-9381/28/23/235009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An `effective' quasi-local energy expression, motivated by the
(relativistically corrected) Newtonian theory, is introduced in exact GR as the
volume integral of all the source terms in the field equation for the Newtonian
potential in static spacetimes. In particular, we exhibit a new post-Newtonian
correction in th... | [
{
"created": "Wed, 9 Feb 2011 14:12:46 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Nov 2011 23:49:34 GMT",
"version": "v2"
},
{
"created": "Tue, 28 Feb 2012 16:33:51 GMT",
"version": "v3"
}
] | 2015-05-27 | [
[
"Frauendiener",
"Jörg",
""
],
[
"Szabados",
"László B",
""
]
] | An `effective' quasi-local energy expression, motivated by the (relativistically corrected) Newtonian theory, is introduced in exact GR as the volume integral of all the source terms in the field equation for the Newtonian potential in static spacetimes. In particular, we exhibit a new post-Newtonian correction in the ... |
1912.09000 | Miguel Sabido | Luis R. Diaz-Barron and M. Sabido | On Emergent Gravity, Ungravity and $\Lambda$ | 4 pages, 1 figure | null | 10.1016/j.physletb.2021.136365 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the "ungravity" modifications to the Friedmann
equations. By using the first law of thermodynamics and the modified entropy
area relationship derived from the "ungravity" contributions to the
Schwarzschild black hole, we obtain modifications to the Friedmann equation
that in the late time regim... | [
{
"created": "Thu, 19 Dec 2019 03:12:18 GMT",
"version": "v1"
}
] | 2021-05-19 | [
[
"Diaz-Barron",
"Luis R.",
""
],
[
"Sabido",
"M.",
""
]
] | In this paper we study the "ungravity" modifications to the Friedmann equations. By using the first law of thermodynamics and the modified entropy area relationship derived from the "ungravity" contributions to the Schwarzschild black hole, we obtain modifications to the Friedmann equation that in the late time regime ... |
2012.07874 | Simeon Bird | Barry C. Barish, Simeon Bird, Yanou Cui | Impact of a Midband Gravitational Wave Experiment On Detectability of
Cosmological Stochastic Gravitational Wave Backgrounds | Matches version accepted to PRD. 14 pages, 8 figures, code available
at https://github.com/sbird/grav_midband | Phys. Rev. D 103, 123541 (2021) | 10.1103/PhysRevD.103.123541 | null | gr-qc astro-ph.CO hep-ex hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We make forecasts for the impact a future "midband" space-based gravitational
wave experiment, most sensitive to $10^{-2}- 10$ Hz, could have on potential
detections of cosmological stochastic gravitational wave backgrounds (SGWBs).
Specific proposed midband experiments considered are TianGo, B-DECIGO and
AEDGE. We p... | [
{
"created": "Mon, 14 Dec 2020 19:00:25 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Jun 2021 18:43:47 GMT",
"version": "v2"
}
] | 2021-06-30 | [
[
"Barish",
"Barry C.",
""
],
[
"Bird",
"Simeon",
""
],
[
"Cui",
"Yanou",
""
]
] | We make forecasts for the impact a future "midband" space-based gravitational wave experiment, most sensitive to $10^{-2}- 10$ Hz, could have on potential detections of cosmological stochastic gravitational wave backgrounds (SGWBs). Specific proposed midband experiments considered are TianGo, B-DECIGO and AEDGE. We pro... |
1001.2828 | Hongsu Kim | Dong-Hoon Kim | Spinning binary waveforms via PN expansion: Equal-mass case | 9 pages, 1 figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Complete expressions of time-domain gravitational waveforms for spinning
binary inspirals via the post-Newtonian (PN) approximation would require
determination of the phase, amplitude, inclination angle, precession phase and
spin vectors as well as the knowledge of the order coefficients for the PN
expansion terms. T... | [
{
"created": "Sat, 16 Jan 2010 14:14:39 GMT",
"version": "v1"
}
] | 2010-01-19 | [
[
"Kim",
"Dong-Hoon",
""
]
] | Complete expressions of time-domain gravitational waveforms for spinning binary inspirals via the post-Newtonian (PN) approximation would require determination of the phase, amplitude, inclination angle, precession phase and spin vectors as well as the knowledge of the order coefficients for the PN expansion terms. The... |
gr-qc/0410062 | Gioel Calabrese | Gioel Calabrese | Finite differencing second order systems describing black hole
spacetimes | null | Phys.Rev. D71 (2005) 027501 | 10.1103/PhysRevD.71.027501 | null | gr-qc | null | Keeping Einstein's equations in second order form can be appealing for
computational efficiency, because of the reduced number of variables and
constraints. Stability issues emerge, however, which are not present in first
order formulations. We show that a standard discretization of the second order
``shifted'' wave ... | [
{
"created": "Thu, 14 Oct 2004 21:09:48 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Calabrese",
"Gioel",
""
]
] | Keeping Einstein's equations in second order form can be appealing for computational efficiency, because of the reduced number of variables and constraints. Stability issues emerge, however, which are not present in first order formulations. We show that a standard discretization of the second order ``shifted'' wave eq... |
2204.08881 | Chao Zhang | Chao Zhang and Yungui Gong | Detecting electric charge with Extreme Mass Ratio Inspirals | 14 pages, 3 figures, 1 table; v2: references added | null | 10.1103/PhysRevD.105.124046 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider extreme mass ratio inspirals during which an electrically charged
compact object with mass $m_p$ and the charge to mass ratio $q$ inspirals
around a Schwarzschild black hole of mass $M$. Using the Teukolsky and
generalized Sasaki-Nakamura formalisms for the gravitational and
electromagnetic perturbations ... | [
{
"created": "Tue, 19 Apr 2022 13:27:17 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Apr 2022 03:20:02 GMT",
"version": "v2"
}
] | 2022-07-13 | [
[
"Zhang",
"Chao",
""
],
[
"Gong",
"Yungui",
""
]
] | We consider extreme mass ratio inspirals during which an electrically charged compact object with mass $m_p$ and the charge to mass ratio $q$ inspirals around a Schwarzschild black hole of mass $M$. Using the Teukolsky and generalized Sasaki-Nakamura formalisms for the gravitational and electromagnetic perturbations ar... |
1408.6205 | Alexey Koshelev | Aindriu Conroy, Alexey S. Koshelev, Anupam Mazumdar | Geodesic completeness and homogeneity condition for cosmic inflation | 4 pages, 1 figure | Phys. Rev. D 90, 123525 (2014) | 10.1103/PhysRevD.90.123525 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There are two disjointed problems in cosmology within General Relativity
(GR), which can be addressed simultaneously by studying the nature of geodesics
around $t\rightarrow 0$, where $t$ is the physical time. One is related to the
past geodesic completeness of the inflationary trajectory due to the presence
of a cos... | [
{
"created": "Tue, 26 Aug 2014 18:36:47 GMT",
"version": "v1"
}
] | 2014-12-24 | [
[
"Conroy",
"Aindriu",
""
],
[
"Koshelev",
"Alexey S.",
""
],
[
"Mazumdar",
"Anupam",
""
]
] | There are two disjointed problems in cosmology within General Relativity (GR), which can be addressed simultaneously by studying the nature of geodesics around $t\rightarrow 0$, where $t$ is the physical time. One is related to the past geodesic completeness of the inflationary trajectory due to the presence of a cosmo... |
0902.0803 | Travis Garrett | Travis Garrett | A Simple, Direct Finite Differencing of the Einstein Equations | 5 pages, 1 figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a simple variation of the Generalized Harmonic method for
evolving the Einstein equations. A flat space wave equation for metric
perturbations is separated from the Ricci tensor, with the rest of the Ricci
tensor becoming a source for these wave equations. We demonstrate that this
splitting method allo... | [
{
"created": "Wed, 4 Feb 2009 21:48:31 GMT",
"version": "v1"
}
] | 2009-02-06 | [
[
"Garrett",
"Travis",
""
]
] | We investigate a simple variation of the Generalized Harmonic method for evolving the Einstein equations. A flat space wave equation for metric perturbations is separated from the Ricci tensor, with the rest of the Ricci tensor becoming a source for these wave equations. We demonstrate that this splitting method allows... |
1401.4640 | Cosimo Bambi | Cosimo Bambi | Testing the Bardeen metric with the black hole candidate in Cygnus X-1 | 5 pages, 2 figures. v2: a few typos corrected | Phys.Lett.B730:59-62,2014 | 10.1016/j.physletb.2014.01.037 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In general, it is very difficult to test the Kerr-nature of an astrophysical
black hole candidate, because it is not possible to have independent
measurements of both the spin parameter $a_*$ and possible deviations from the
Kerr solution. Non-Kerr objects may indeed look like Kerr black holes with
different spin. Ho... | [
{
"created": "Sun, 19 Jan 2014 06:57:26 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Jan 2014 19:53:51 GMT",
"version": "v2"
}
] | 2014-01-28 | [
[
"Bambi",
"Cosimo",
""
]
] | In general, it is very difficult to test the Kerr-nature of an astrophysical black hole candidate, because it is not possible to have independent measurements of both the spin parameter $a_*$ and possible deviations from the Kerr solution. Non-Kerr objects may indeed look like Kerr black holes with different spin. Howe... |
2005.05798 | Fay\c{c}al Hammad | Fay\c{c}al Hammad and Alexandre Landry | A simple superconductor quantum interference device for testing gravity | 20 pages, 1 figure, references updated, title slightly improved | Mod. Phys. Lett. 35, 2050171 (2020) | 10.1142/S0217732320501710 | null | gr-qc cond-mat.supr-con | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A simple tabletop setup based on a superconducting quantum interference
device is proposed for testing the gravitational interaction. A D-shaped
superconducting loop has the straight segment immersed inside a massive sphere
while the half-circle segment is wrapped around the sphere. The superconducting
condensate wit... | [
{
"created": "Sat, 9 May 2020 17:50:06 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jun 2020 21:23:24 GMT",
"version": "v2"
}
] | 2020-07-02 | [
[
"Hammad",
"Fayçal",
""
],
[
"Landry",
"Alexandre",
""
]
] | A simple tabletop setup based on a superconducting quantum interference device is proposed for testing the gravitational interaction. A D-shaped superconducting loop has the straight segment immersed inside a massive sphere while the half-circle segment is wrapped around the sphere. The superconducting condensate withi... |
gr-qc/0412002 | Harald P. Pfeiffer | Harald P. Pfeiffer | The initial value problem in numerical relativity | Contribution to the proceedings of "Miami Waves Conference 2004", 24
pages | null | null | null | gr-qc | null | The conformal method for constructing initial data for Einstein's equations
is presented in both the Hamiltonian and Lagrangian picture (extrinsic
curvature decomposition and conformal thin sandwich formalism, respectively),
and advantages due to the recent introduction of a weight-function in the
extrinsic curvature... | [
{
"created": "Wed, 1 Dec 2004 17:32:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pfeiffer",
"Harald P.",
""
]
] | The conformal method for constructing initial data for Einstein's equations is presented in both the Hamiltonian and Lagrangian picture (extrinsic curvature decomposition and conformal thin sandwich formalism, respectively), and advantages due to the recent introduction of a weight-function in the extrinsic curvature d... |
gr-qc/9806078 | Jong Hyuk Yoon | Jong Hyuk Yoon | Quasi-Local Energy Conservation Law Derived From The Einstein's
Equations | 10 pages, 1 figure, RevTex | null | null | null | gr-qc | null | The quasi-local energy conservation law is derived from the vacuum Einstein's
equations on the timelike boundary surface in the canonical (2,2)-formalism of
general relativity. The quasi-local energy and energy flux integral agree with
the standard results in the asymptotically flat limit and in spherically
symmetric... | [
{
"created": "Fri, 19 Jun 1998 08:42:14 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Yoon",
"Jong Hyuk",
""
]
] | The quasi-local energy conservation law is derived from the vacuum Einstein's equations on the timelike boundary surface in the canonical (2,2)-formalism of general relativity. The quasi-local energy and energy flux integral agree with the standard results in the asymptotically flat limit and in spherically symmetric s... |
1908.10806 | Pierre-Henri Chavanis | Pierre-Henri Chavanis | Statistical mechanics of self-gravitating systems in general relativity:
I. The quantum Fermi gas | null | Eur. Phys. J. Plus, 135, 290 (2020) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a general formalism to determine the statistical equilibrium
states of self-gravitating systems in general relativity and complete previous
works on the subject. Our results are valid for an arbitrary form of entropy
but, for illustration, we explicitly consider the Fermi-Dirac entropy for
fermions. The ma... | [
{
"created": "Wed, 28 Aug 2019 16:16:54 GMT",
"version": "v1"
}
] | 2020-12-24 | [
[
"Chavanis",
"Pierre-Henri",
""
]
] | We develop a general formalism to determine the statistical equilibrium states of self-gravitating systems in general relativity and complete previous works on the subject. Our results are valid for an arbitrary form of entropy but, for illustration, we explicitly consider the Fermi-Dirac entropy for fermions. The maxi... |
2310.17291 | C\'edric Jockel | C\'edric Jockel, Laura Sagunski | Fermion Proca Stars: Vector Dark Matter Admixed Neutron Stars | 20 pages, 11 figures, supersedes arXiv:2308.12174. v2: Content
matches published version in Particles (open access)
https://www.mdpi.com/2571-712X/7/1/4 | Particles 2024, 7(1), 52-79 | 10.3390/particles7010004 | null | gr-qc astro-ph.CO astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | Dark matter could accumulate around neutron stars in sufficient amounts to
affect their global properties. In this work, we study the effect of a specific
model for dark matter -- a massive and self-interacting vector (spin-1) field
-- on neutron stars. We describe the combined systems of neutron stars and
vector dar... | [
{
"created": "Thu, 26 Oct 2023 10:15:46 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Jan 2024 10:14:58 GMT",
"version": "v2"
}
] | 2024-01-17 | [
[
"Jockel",
"Cédric",
""
],
[
"Sagunski",
"Laura",
""
]
] | Dark matter could accumulate around neutron stars in sufficient amounts to affect their global properties. In this work, we study the effect of a specific model for dark matter -- a massive and self-interacting vector (spin-1) field -- on neutron stars. We describe the combined systems of neutron stars and vector dark ... |
gr-qc/9506057 | Matej Pavi | Matej Pavsic (Jozef Stefan Institute, University of Ljubljana) | On the Resolution of Time Problem in Quantum Gravity Induced from
Unconstrained Membranes | 22 Pages | Found.Phys.26:159-195,1996 | 10.1007/BF02058084 | null | gr-qc | null | The relativistic theory of unconstrained $p$-dimensional membranes
($p$-branes) is further developed and then applied to the embedding model of
induced gravity. Space-time is considered as a 4-dimensional unconstrained
membrane evolving in an $N$-dimensional embedding space. The parameter of
evolution or the evolutio... | [
{
"created": "Tue, 27 Jun 1995 14:36:25 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Jun 1995 12:34:48 GMT",
"version": "v2"
},
{
"created": "Thu, 29 Jun 1995 12:20:50 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Pavsic",
"Matej",
"",
"Jozef Stefan Institute, University of Ljubljana"
]
] | The relativistic theory of unconstrained $p$-dimensional membranes ($p$-branes) is further developed and then applied to the embedding model of induced gravity. Space-time is considered as a 4-dimensional unconstrained membrane evolving in an $N$-dimensional embedding space. The parameter of evolution or the evolution ... |
gr-qc/0104026 | T. Damour | Thibault Damour and Alexander Vilenkin | Gravitational wave bursts from cusps and kinks on cosmic strings | 24 pages, 3 figures, Revtex, submitted to Phys. Rev. D | Phys.Rev.D64:064008,2001 | 10.1103/PhysRevD.64.064008 | IHES/P/01/15 | gr-qc astro-ph | null | The strong beams of high-frequency gravitational waves (GW) emitted by cusps
and kinks of cosmic strings are studied in detail. As a consequence of these
beams, the stochastic ensemble of GW's generated by a cosmological network of
oscillating loops is strongly non Gaussian, and includes occasional sharp
bursts that ... | [
{
"created": "Tue, 10 Apr 2001 07:52:07 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Damour",
"Thibault",
""
],
[
"Vilenkin",
"Alexander",
""
]
] | The strong beams of high-frequency gravitational waves (GW) emitted by cusps and kinks of cosmic strings are studied in detail. As a consequence of these beams, the stochastic ensemble of GW's generated by a cosmological network of oscillating loops is strongly non Gaussian, and includes occasional sharp bursts that st... |
gr-qc/0010076 | Pascual-Sanchez J.-F. | J.-F. Pascual-S\'anchez (University of Valladolid) | A generalized linear Hubble law for an inhomogeneous barotropic Universe | 9 pages, LaTeX, to be published in Class. Quantum Grav | Class.Quant.Grav.17:4913-4918,2000 | 10.1088/0264-9381/17/23/309 | null | gr-qc astro-ph | null | In this work, I present a generalized linear Hubble law for a barotropic
spherically symmetric inhomogeneous spacetime, which is in principle compatible
with the acceleration of the cosmic expansion obtained as a result of high
redshift Supernovae data. The new Hubble function, defined by this law, has two
additional... | [
{
"created": "Fri, 20 Oct 2000 18:10:05 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Pascual-Sánchez",
"J. -F.",
"",
"University of Valladolid"
]
] | In this work, I present a generalized linear Hubble law for a barotropic spherically symmetric inhomogeneous spacetime, which is in principle compatible with the acceleration of the cosmic expansion obtained as a result of high redshift Supernovae data. The new Hubble function, defined by this law, has two additional t... |
gr-qc/0607033 | Ali Shojai | Fatimah Shojai and Ali Shojai | Variational Methods in Loop Quantum Cosmology | To appear in EuroPhysics Letters | Europhys.Lett. 75 (2006) 702-708 | 10.1209/epl/i2006-10166-9 | null | gr-qc | null | An action functional for the loop quantum cosmology difference equation is
presented. It is shown that by guessing the general form of the solution and
optimizing the action functional with respect to the parameters in the guessed
solution one can obtain approximate solutions which are reasonably good.
| [
{
"created": "Sun, 9 Jul 2006 08:55:11 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Shojai",
"Fatimah",
""
],
[
"Shojai",
"Ali",
""
]
] | An action functional for the loop quantum cosmology difference equation is presented. It is shown that by guessing the general form of the solution and optimizing the action functional with respect to the parameters in the guessed solution one can obtain approximate solutions which are reasonably good. |
gr-qc/0403111 | Olaf Wucknitz | Olaf Wucknitz (Universitaet Potsdam) | Sagnac effect, twin paradox and space-time topology - Time and length in
rotating systems and closed Minkowski space-times | 31 pages, 10 (mostly color) figures included. revtex4. Submitted to
Foundations of Physics | null | null | null | gr-qc astro-ph | null | We discuss the Sagnac effect in standard Minkowski coordinates and with an
alternative synchronization convention. We find that both approaches lead to
the same result without any contradictions. When applying standard coordinates
to the complete rim of the rotating disk, a time-lag has to be taken into
account which... | [
{
"created": "Mon, 29 Mar 2004 16:50:45 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wucknitz",
"Olaf",
"",
"Universitaet Potsdam"
]
] | We discuss the Sagnac effect in standard Minkowski coordinates and with an alternative synchronization convention. We find that both approaches lead to the same result without any contradictions. When applying standard coordinates to the complete rim of the rotating disk, a time-lag has to be taken into account which a... |
1910.04160 | Waleed El Hanafy | W. El Hanafy and G.G.L. Nashed | Phenomenological Reconstruction of $f(T)$ Teleparallel Gravity | 16 pages, 6 figures and 3 tables. Published in Physical Review D | Phys. Rev. D 100, 083535 (2019) | 10.1103/PhysRevD.100.083535 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a novel reconstruction method of $f(T)$ teleparallel gravity from
phenomenological parameterizations of the deceleration parameter or other
alternatives. This can be used as a toolkit to produce viable modified gravity
scenarios directly related to cosmological observations. We test two
parameterizations o... | [
{
"created": "Wed, 9 Oct 2019 13:48:35 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Oct 2019 10:57:14 GMT",
"version": "v2"
}
] | 2019-10-29 | [
[
"Hanafy",
"W. El",
""
],
[
"Nashed",
"G. G. L.",
""
]
] | We present a novel reconstruction method of $f(T)$ teleparallel gravity from phenomenological parameterizations of the deceleration parameter or other alternatives. This can be used as a toolkit to produce viable modified gravity scenarios directly related to cosmological observations. We test two parameterizations of ... |
gr-qc/9908035 | Carey Carpenter Briggs | C. C. Briggs | A Simple Derivation of the Einstein-Maxwell Field Equations from the 2nd
Ordinary Exterior Differential of a Precursor to the Soldering Form | 5 pages | null | null | null | gr-qc | null | A simple derivation is given of the Einstein-Maxwell field equations from the
2nd ordinary exterior differential of a precursor to the soldering form for
n-dimensional differentiable manifolds having a general linear connection and
in 5-dimensional general relativity in particular.
| [
{
"created": "Wed, 11 Aug 1999 02:16:17 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Briggs",
"C. C.",
""
]
] | A simple derivation is given of the Einstein-Maxwell field equations from the 2nd ordinary exterior differential of a precursor to the soldering form for n-dimensional differentiable manifolds having a general linear connection and in 5-dimensional general relativity in particular. |
2109.09814 | Frans Pretorius | Ulf Danielsson, Luis Lehner, Frans Pretorius | Dynamics and Observational Signatures of Shell-like Black Hole Mimickers | 27 pages, 7 figures | null | 10.1103/PhysRevD.104.124011 | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | We undertake the task of studying the non-linear dynamics of quantum gravity
motivated alternatives to black holes that in the classical limit appear as
ultra-compact shells of matter. We develop a formalism that should be amenable
to numerical solution in generic situations. For a concrete model we focus on
the sphe... | [
{
"created": "Mon, 20 Sep 2021 19:46:24 GMT",
"version": "v1"
}
] | 2021-12-15 | [
[
"Danielsson",
"Ulf",
""
],
[
"Lehner",
"Luis",
""
],
[
"Pretorius",
"Frans",
""
]
] | We undertake the task of studying the non-linear dynamics of quantum gravity motivated alternatives to black holes that in the classical limit appear as ultra-compact shells of matter. We develop a formalism that should be amenable to numerical solution in generic situations. For a concrete model we focus on the spheri... |
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