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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0802.1129 | S. Mignemi | S. Mignemi | Doubly special relativity in de Sitter spacetime | 18 pages, plain TeX | Annalen Phys.522:924-940,2010 | 10.1002/andp.201000105 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the generalization of Doubly Special Relativity to a curved de
Sitter background. The model has three observer-independent scales, the
velocity of light $c$, the radius of curvature of the geometry $\alpha$, and
the Planck energy $\kappa$, and can be realized in a noncommutative position
space. It is possi... | [
{
"created": "Fri, 8 Feb 2008 11:31:26 GMT",
"version": "v1"
}
] | 2010-11-29 | [
[
"Mignemi",
"S.",
""
]
] | We discuss the generalization of Doubly Special Relativity to a curved de Sitter background. The model has three observer-independent scales, the velocity of light $c$, the radius of curvature of the geometry $\alpha$, and the Planck energy $\kappa$, and can be realized in a noncommutative position space. It is possibl... |
2210.09755 | Giuseppe Gaetano Luciano Dr | Giuseppe Gaetano Luciano and Jaume Gin\'e | Generalized interacting Barrow Holographic Dark Energy: cosmological
predictions and thermodynamic considerations | 16 pages, 21 captioned figures, 1 table (This is an extension of
arXiv:2210.06320) | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We construct a generalized interacting model of Barrow Holographic Dark
Energy (BHDE) with infrared cutoff being given by the Hubble horizon. We
analyze the cosmological evolution of a flat
Friedmann-Lema\^itre-Robertson-Walker Universe filled by pressureless dark
matter, BHDE and radiation fluid. The interaction bet... | [
{
"created": "Tue, 18 Oct 2022 11:11:30 GMT",
"version": "v1"
}
] | 2022-10-19 | [
[
"Luciano",
"Giuseppe Gaetano",
""
],
[
"Giné",
"Jaume",
""
]
] | We construct a generalized interacting model of Barrow Holographic Dark Energy (BHDE) with infrared cutoff being given by the Hubble horizon. We analyze the cosmological evolution of a flat Friedmann-Lema\^itre-Robertson-Walker Universe filled by pressureless dark matter, BHDE and radiation fluid. The interaction betwe... |
2306.03165 | Brian Allen | Brian Allen | Null Distance and Gromov-Hausdorff Convergence of Warped Product
Spacetimes | v2: 32 pages, 1 figure, To appear in General Relativity and
Gravitation | null | null | null | gr-qc math.DG math.MG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | What is the analogous notion of Gromov-Hausdorff convergence for sequences of
spacetimes? Since a Lorentzian manifold is not inherently a metric space, one
cannot simply use the traditional definition. One approach offered by Sormani
and Vega \cite{SV} is to define a metric space structure on a spacetime by
means of ... | [
{
"created": "Mon, 5 Jun 2023 18:20:23 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Oct 2023 14:03:10 GMT",
"version": "v2"
}
] | 2023-10-17 | [
[
"Allen",
"Brian",
""
]
] | What is the analogous notion of Gromov-Hausdorff convergence for sequences of spacetimes? Since a Lorentzian manifold is not inherently a metric space, one cannot simply use the traditional definition. One approach offered by Sormani and Vega \cite{SV} is to define a metric space structure on a spacetime by means of th... |
gr-qc/9409048 | Robert Bruce Mann | R.B. Mann and W.N. Sajko | Infinite Blueshift of Charged Null Particles | 3 pages, latex, no figures, some clarifying remarks added and typos
corrected | null | null | WATPHYS TH-94/05 | gr-qc hep-ph | null | We demonstrate that charged null particles can be infinitely blue\-shifted in
a Kerr-Newman spacetime. The surface of infinite blueshift can be outside of
the ergosphere in a Kerr-Newman spacetime, and outside of the outer event
horizon for a Reissner-Nordstrom spacetime. Implications for extensions of the
standard m... | [
{
"created": "Thu, 22 Sep 1994 13:48:25 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Nov 1994 15:13:26 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Mann",
"R. B.",
""
],
[
"Sajko",
"W. N.",
""
]
] | We demonstrate that charged null particles can be infinitely blue\-shifted in a Kerr-Newman spacetime. The surface of infinite blueshift can be outside of the ergosphere in a Kerr-Newman spacetime, and outside of the outer event horizon for a Reissner-Nordstrom spacetime. Implications for extensions of the standard mod... |
gr-qc/0405036 | Patrick Brady | Patrick R Brady and Saikat Ray-Majumder | Incorporating information from source simulations into searches for
gravitational-wave bursts | 8 pages, 1 figure | Class.Quant.Grav. 21 (2004) S1839-S1848 | 10.1088/0264-9381/21/20/027 | null | gr-qc | null | The detection of gravitational waves from astrophysical sources of
gravitational waves is a realistic goal for the current generation of
interferometric gravitational-wave detectors. Short duration bursts of
gravitational waves from core-collapse supernovae or mergers of binary black
holes may bring a wealth of astro... | [
{
"created": "Thu, 6 May 2004 21:00:55 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Brady",
"Patrick R",
""
],
[
"Ray-Majumder",
"Saikat",
""
]
] | The detection of gravitational waves from astrophysical sources of gravitational waves is a realistic goal for the current generation of interferometric gravitational-wave detectors. Short duration bursts of gravitational waves from core-collapse supernovae or mergers of binary black holes may bring a wealth of astrono... |
1311.6378 | Rosevaldo de Oliveira | R. de Oliveira, S. J. da Silva and V. H. G. de Campos | Clifford Algebra and Space-Time Transformations: Lorentz Transformation
and Inertial Transformation | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the Inertial transformation and Lorentz transformation under a new
context, by using Clifford Algebra or Geometric Algebra. The apparent
contradiction between theses two approach is simply stems from different
procedures for clock synchronization associated with different choices of the
coordinates used to ... | [
{
"created": "Mon, 25 Nov 2013 17:41:48 GMT",
"version": "v1"
}
] | 2013-11-26 | [
[
"de Oliveira",
"R.",
""
],
[
"da Silva",
"S. J.",
""
],
[
"de Campos",
"V. H. G.",
""
]
] | We review the Inertial transformation and Lorentz transformation under a new context, by using Clifford Algebra or Geometric Algebra. The apparent contradiction between theses two approach is simply stems from different procedures for clock synchronization associated with different choices of the coordinates used to de... |
1105.3445 | Aron Wall | Aron C. Wall | A proof of the generalized second law for rapidly changing fields and
arbitrary horizon slices | 44 pages, 1 fig. v3: clarified Sec. 2; signs, factors/notation
corrected in Eq. 75-80, 105-107; reflects published version. v4: clearer
axioms in Sec. 2.3, fixed compensating factor of 2 errors in Eq. 54,74 etc.,
and other errors. Results unaffected. v5: fixed typos. v6: replaced faulty
1+1 CFT argument, added ... | Phys. Rev. D 85, 104049 (2012) | 10.1103/PhysRevD.85.104049 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The generalized second law is proven for semiclassical quantum fields falling
across a causal horizon, minimally coupled to general relativity. The proof is
much more general than previous proofs in that it permits the quantum fields to
be rapidly changing with time, and shows that entropy increases when comparing
an... | [
{
"created": "Tue, 17 May 2011 18:03:55 GMT",
"version": "v1"
},
{
"created": "Sat, 7 Jan 2012 00:43:43 GMT",
"version": "v2"
},
{
"created": "Sat, 26 May 2012 23:32:21 GMT",
"version": "v3"
},
{
"created": "Tue, 26 Feb 2013 02:19:30 GMT",
"version": "v4"
},
{
"cr... | 2018-10-18 | [
[
"Wall",
"Aron C.",
""
]
] | The generalized second law is proven for semiclassical quantum fields falling across a causal horizon, minimally coupled to general relativity. The proof is much more general than previous proofs in that it permits the quantum fields to be rapidly changing with time, and shows that entropy increases when comparing any ... |
2102.11698 | Christian J. Kr\"uger | Christian J. Kr\"uger, Daniela D. Doneva | Oscillation dynamics of scalarized neutron stars | 28 pages, 5 figures | Phys. Rev. D 103, 124034 (2021) | 10.1103/PhysRevD.103.124034 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scalar-tensor theories are well studied extensions of general relativity that
offer deviations which are yet within observational boundaries. We present the
time evolution equations governing the perturbations of a nonrotating
scalarized neutron star, including a dynamic spacetime as well as scalar field
within the f... | [
{
"created": "Tue, 23 Feb 2021 13:59:46 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Jul 2021 11:40:12 GMT",
"version": "v2"
}
] | 2021-07-06 | [
[
"Krüger",
"Christian J.",
""
],
[
"Doneva",
"Daniela D.",
""
]
] | Scalar-tensor theories are well studied extensions of general relativity that offer deviations which are yet within observational boundaries. We present the time evolution equations governing the perturbations of a nonrotating scalarized neutron star, including a dynamic spacetime as well as scalar field within the fra... |
gr-qc/0612163 | L\'aszl\'o \'A Gergely | L\'aszl\'o \'A. Gergely | Is dark matter futile on the brane? | to appear in the Proceedings of the Eleventh Marcel Grossmann Meeting
2006, World Scientific, Singapore (2007) | Proceedings of the Eleventh Marcel Grossmann Meeting 2006, Eds. H
Kleinert, RT Jantzen and R Ruffini, World Scientific, Singapore, p. 997-999
(2008) | null | null | gr-qc astro-ph hep-th | null | We investigate whether dark matter can be replaced by various source terms
appearing in the effective Einstein equation, valid on a brane embedded into a
higher dimensional space-time (the bulk). Such non-conventional source terms
include a quadratic (ordinary) matter source term, a geometric source term
originating ... | [
{
"created": "Wed, 27 Dec 2006 13:16:34 GMT",
"version": "v1"
}
] | 2009-05-15 | [
[
"Gergely",
"László Á.",
""
]
] | We investigate whether dark matter can be replaced by various source terms appearing in the effective Einstein equation, valid on a brane embedded into a higher dimensional space-time (the bulk). Such non-conventional source terms include a quadratic (ordinary) matter source term, a geometric source term originating in... |
2201.11021 | Nikolaos Kalntis | Nikolaos Kalntis | A Heuristic Approach to the Far-Future State of a Universe Dominated by
Phantom Energy | 12 pages, 4 figures | Journal of High Energy Physics, Gravitation and Cosmology, 8,
948-959, (2022) | 10.4236/jhepgc.2022.84066 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | This work is based on a cosmological scenario of a universe dominated by
phantom energy with equation of state parameter $w<-1$ and the analysis of its
asymptotic behaviour in the far-future. The author discusses whether a Big Rip
singularity could be reached in the future. Working in the context of general
relativit... | [
{
"created": "Tue, 25 Jan 2022 05:27:21 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Oct 2022 14:26:18 GMT",
"version": "v2"
}
] | 2022-10-11 | [
[
"Kalntis",
"Nikolaos",
""
]
] | This work is based on a cosmological scenario of a universe dominated by phantom energy with equation of state parameter $w<-1$ and the analysis of its asymptotic behaviour in the far-future. The author discusses whether a Big Rip singularity could be reached in the future. Working in the context of general relativity,... |
1709.08440 | Ritesh Singh K. | Priyasri Kar, Ritesh K. Singh, Ananda Dasgupta, Prasanta K. Panigrahi | Heun polynomials and exact solutions for the massless Dirac particle in
the C-metric | 11 pages. This version supersedes 1601.03601 | null | 10.1515/zna-2017-0355 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The equation of motion of a massless Dirac particle in the C-metric leads to
the general Heun equation (GHE) for the radial and the polar variables. The
GHE, under certain parametric conditions, has been cast in terms of a new set
of $su(1,1)$ generators involving differential operators of \emph{degrees} $\pm
1/2$ an... | [
{
"created": "Mon, 25 Sep 2017 12:01:26 GMT",
"version": "v1"
}
] | 2018-05-09 | [
[
"Kar",
"Priyasri",
""
],
[
"Singh",
"Ritesh K.",
""
],
[
"Dasgupta",
"Ananda",
""
],
[
"Panigrahi",
"Prasanta K.",
""
]
] | The equation of motion of a massless Dirac particle in the C-metric leads to the general Heun equation (GHE) for the radial and the polar variables. The GHE, under certain parametric conditions, has been cast in terms of a new set of $su(1,1)$ generators involving differential operators of \emph{degrees} $\pm 1/2$ and ... |
1505.03857 | Eyo Ita III | Eyo E. Ita | Four dimensional gravity as an almost Poisson system | 19 pages | IJMPD Vol 24, No.7 (2015) 155047 (19 pages) | 10.1142/S0218271815500479 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we examine the phase space structure of a noncanonical
formulation of 4-dimensional gravity referred to as the Instanton
representation of Plebanski gravity (IRPG). The typical Hamiltonian
(symplectic) approach leads to an obstruction to the definition of a symplectic
structure on the full phase space o... | [
{
"created": "Thu, 14 May 2015 13:30:49 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Ita",
"Eyo E.",
""
]
] | In this paper we examine the phase space structure of a noncanonical formulation of 4-dimensional gravity referred to as the Instanton representation of Plebanski gravity (IRPG). The typical Hamiltonian (symplectic) approach leads to an obstruction to the definition of a symplectic structure on the full phase space of ... |
1302.7177 | Suprit Singh | Suprit Singh, Chandrima Ganguly and T. Padmanabhan | Quantum field theory in de Sitter and quasi-de Sitter spacetimes:
Revisited | 26 pages | Phys. Rev. D 87, 104004 (2013) | 10.1103/PhysRevD.87.104004 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is possible to associate temperatures with the non-extremal horizons of a
large class of spherically symmetric spacetimes using periodicity in the
Euclidean sector and this procedure works for the de Sitter spacetime as well.
But, unlike e.g., the black hole spacetimes, the de Sitter spacetime also
allows a descri... | [
{
"created": "Thu, 28 Feb 2013 12:53:50 GMT",
"version": "v1"
},
{
"created": "Sat, 2 Mar 2013 13:39:30 GMT",
"version": "v2"
},
{
"created": "Tue, 7 May 2013 06:34:26 GMT",
"version": "v3"
}
] | 2013-05-08 | [
[
"Singh",
"Suprit",
""
],
[
"Ganguly",
"Chandrima",
""
],
[
"Padmanabhan",
"T.",
""
]
] | It is possible to associate temperatures with the non-extremal horizons of a large class of spherically symmetric spacetimes using periodicity in the Euclidean sector and this procedure works for the de Sitter spacetime as well. But, unlike e.g., the black hole spacetimes, the de Sitter spacetime also allows a descript... |
gr-qc/0401046 | Wung-Hong Huang | Wung-Hong Huang | Quantum Field Effects on Cosmological Phase Transition in Anisotropic
Spacetimes | Latex 17 pages | Class.Quant.Grav.10:2021-2033,1993 | 10.1088/0264-9381/10/10/009 | null | gr-qc hep-th | null | The one-loop renormalized effective potentials for the massive $\phi^4$
theory on the spatially homogeneous models of Bianchi type I and
Kantowski-Sachs type are evaluated. It is used to see how the quantum field
affects the cosmological phase transition in the anisotropic spacetimes. For
reasons of the mathematical ... | [
{
"created": "Mon, 12 Jan 2004 01:58:38 GMT",
"version": "v1"
}
] | 2011-01-27 | [
[
"Huang",
"Wung-Hong",
""
]
] | The one-loop renormalized effective potentials for the massive $\phi^4$ theory on the spatially homogeneous models of Bianchi type I and Kantowski-Sachs type are evaluated. It is used to see how the quantum field affects the cosmological phase transition in the anisotropic spacetimes. For reasons of the mathematical te... |
2105.07629 | Jun'ichi Yokoyama | Jun'ichi Yokoyama | Implication of Pulsar Timing Array Experiments on Cosmological
Gravitational Wave Detection | Introductory review article for AAPPS Bulletin | AAPPS Bulletin 31 (2021) 17 | 10.1007/s43673-021-00020-5 | RESCEU-9/21 | gr-qc astro-ph.CO astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waves provide a new probe of the Universe which can reveal a
number of cosmological and astrophysical phenomena that cannot be observed by
electromagnetic waves. Different frequencies of gravitational waves are
detected by different means. Among them, precision measurements of pulsar
timing provides a n... | [
{
"created": "Mon, 17 May 2021 06:31:22 GMT",
"version": "v1"
}
] | 2021-11-08 | [
[
"Yokoyama",
"Jun'ichi",
""
]
] | Gravitational waves provide a new probe of the Universe which can reveal a number of cosmological and astrophysical phenomena that cannot be observed by electromagnetic waves. Different frequencies of gravitational waves are detected by different means. Among them, precision measurements of pulsar timing provides a nat... |
gr-qc/0111030 | Jacek Jezierski | Jacek Jezierski | "Peeling property" for linearized gravity in null coordinates | 27 pages | Class.Quant.Grav. 19 (2002) 2463-2490 | 10.1088/0264-9381/19/9/310 | 20/2001, CNRS UMR 6083 | gr-qc | null | A complete description of the linearized gravitational field on a flat
background is given in terms of gauge-independent quasilocal quantities. This
is an extension of the results from gr-qc/9801068. Asymptotic spherical
quasilocal parameterization of the Weyl field and its relation with Einstein
equations is present... | [
{
"created": "Fri, 9 Nov 2001 16:15:18 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Jezierski",
"Jacek",
""
]
] | A complete description of the linearized gravitational field on a flat background is given in terms of gauge-independent quasilocal quantities. This is an extension of the results from gr-qc/9801068. Asymptotic spherical quasilocal parameterization of the Weyl field and its relation with Einstein equations is presented... |
2311.12762 | Kazuto Takahashi | Kazuto Takahashi, Hayato Motohashi | Iterative extraction of overtones from black hole ringdown | 38 pages, 38 figures | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Extraction of multiple quasinormal modes from ringdown gravitational waves
emitted from a binary black hole coalescence is a touchstone to test whether a
remnant black hole is described by the Kerr spacetime in general relativity.
However, it is not straightforward to check the consistency between the
ringdown signal... | [
{
"created": "Tue, 21 Nov 2023 18:16:56 GMT",
"version": "v1"
}
] | 2023-11-22 | [
[
"Takahashi",
"Kazuto",
""
],
[
"Motohashi",
"Hayato",
""
]
] | Extraction of multiple quasinormal modes from ringdown gravitational waves emitted from a binary black hole coalescence is a touchstone to test whether a remnant black hole is described by the Kerr spacetime in general relativity. However, it is not straightforward to check the consistency between the ringdown signal a... |
gr-qc/0509118 | Alejandro Perez | Alejandro Perez | On the regularization ambiguities in loop quantum gravity | 21 pages | Phys.Rev. D73 (2006) 044007 | 10.1103/PhysRevD.73.044007 | null | gr-qc hep-lat hep-th | null | One of the main achievements of LQG is the consistent quantization of the
Wheeler-DeWitt equation which is free of UV problems. However, ambiguities
associated to the intermediate regularization procedure lead to an apparently
infinite set of possible theories. The absence of an UV problem is intimately
linked with t... | [
{
"created": "Thu, 29 Sep 2005 15:51:33 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Perez",
"Alejandro",
""
]
] | One of the main achievements of LQG is the consistent quantization of the Wheeler-DeWitt equation which is free of UV problems. However, ambiguities associated to the intermediate regularization procedure lead to an apparently infinite set of possible theories. The absence of an UV problem is intimately linked with the... |
0806.2783 | Gonzalo Olmo | Gonzalo J. Olmo and Parampreet Singh | Covariant Effective Action for Loop Quantum Cosmology a la Palatini | 5 pages, 1 figure, minor revision to match published version (JCAP),
presentation and abstract improved, references added | JCAP 0901:030,2009 | 10.1088/1475-7516/2009/01/030 | PI-QG-83 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In loop quantum cosmology, non-perturbative quantum gravity effects lead to
the resolution of the big bang singularity by a quantum bounce without
introducing any new degrees of freedom. Though fundamentally discrete, the
theory admits a continuum description in terms of an effective Hamiltonian.
Here we provide an a... | [
{
"created": "Tue, 17 Jun 2008 13:11:27 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Dec 2008 13:45:04 GMT",
"version": "v2"
}
] | 2010-05-12 | [
[
"Olmo",
"Gonzalo J.",
""
],
[
"Singh",
"Parampreet",
""
]
] | In loop quantum cosmology, non-perturbative quantum gravity effects lead to the resolution of the big bang singularity by a quantum bounce without introducing any new degrees of freedom. Though fundamentally discrete, the theory admits a continuum description in terms of an effective Hamiltonian. Here we provide an alg... |
gr-qc/9908020 | Liu Liao | Liao Liu and Yongge Ma | Gravitational Thermodynamics of Space-time Foam in One-loop
Approximation | 7 pages, revtex | Int.J.Mod.Phys. D9 (2000) 91-95 | 10.1142/S0218271800000098 | null | gr-qc | null | We show from one-loop quantum gravity and statistical thermodynamics that the
thermodynamics of quantum foam in flat space-time and Schwarzschild space-time
is exactly the same as that of Hawking-Unruh radiation in thermal equilibrium.
This means we show unambiguously that Hawking-Unruh thermal radiation should
conta... | [
{
"created": "Fri, 6 Aug 1999 03:41:13 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Liu",
"Liao",
""
],
[
"Ma",
"Yongge",
""
]
] | We show from one-loop quantum gravity and statistical thermodynamics that the thermodynamics of quantum foam in flat space-time and Schwarzschild space-time is exactly the same as that of Hawking-Unruh radiation in thermal equilibrium. This means we show unambiguously that Hawking-Unruh thermal radiation should contain... |
1005.0477 | Joan Josep Ferrando | Bartolom\'e Coll, Joan Josep Ferrando, Juan Antonio Morales-Lladosa | Positioning in a flat two-dimensional space-time: the delay master
equation | 15 pages, 6 figures | Phys.Rev.D82:084038,2010 | 10.1103/PhysRevD.82.084038 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The basic theory on relativistic positioning systems in a two-dimensional
space-time has been presented in two previous papers [Phys. Rev. D {\bf 73},
084017 (2006); {\bf 74}, 104003 (2006)], where the possibility of making
relativistic gravimetry with these systems has been analyzed by considering
specific examples.... | [
{
"created": "Tue, 4 May 2010 10:02:21 GMT",
"version": "v1"
}
] | 2010-10-27 | [
[
"Coll",
"Bartolomé",
""
],
[
"Ferrando",
"Joan Josep",
""
],
[
"Morales-Lladosa",
"Juan Antonio",
""
]
] | The basic theory on relativistic positioning systems in a two-dimensional space-time has been presented in two previous papers [Phys. Rev. D {\bf 73}, 084017 (2006); {\bf 74}, 104003 (2006)], where the possibility of making relativistic gravimetry with these systems has been analyzed by considering specific examples. H... |
2404.08572 | Sebastian Schenk | Wolfram Ratzinger, Sebastian Schenk, Pedro Schwaller | A Coordinate-Independent Formalism for Detecting High-Frequency
Gravitational Waves | 22 pages plus appendix, 4 figures | null | null | MITP-24-040 | gr-qc astro-ph.IM hep-ex hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In an external electric or magnetic field, a gravitational wave (GW) may be
converted into electromagnetic radiation. We present a coordinate-invariant
framework to describe the GW signal in a detector that is based on this effect,
such as cavities for axion searches. In this framework, we pay special
attention to th... | [
{
"created": "Fri, 12 Apr 2024 16:16:32 GMT",
"version": "v1"
}
] | 2024-04-15 | [
[
"Ratzinger",
"Wolfram",
""
],
[
"Schenk",
"Sebastian",
""
],
[
"Schwaller",
"Pedro",
""
]
] | In an external electric or magnetic field, a gravitational wave (GW) may be converted into electromagnetic radiation. We present a coordinate-invariant framework to describe the GW signal in a detector that is based on this effect, such as cavities for axion searches. In this framework, we pay special attention to the ... |
0906.4808 | Mamdouh Wanas | M.I. Wanas and Samah A. Ammar | A Pure Geometric Approach to Stellar Structure | 18 pages, 2 figures, revised version | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present work represents a step to deal with stellar structure using a
pure geometric approach. A geometric field theory is used to construct a model
for a spherically symmetric configuration. The model obtained can be considered
as a pure geometric one in the sense that the tensor describing the material
distribu... | [
{
"created": "Thu, 25 Jun 2009 22:04:58 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Sep 2011 12:47:22 GMT",
"version": "v2"
}
] | 2011-09-27 | [
[
"Wanas",
"M. I.",
""
],
[
"Ammar",
"Samah A.",
""
]
] | The present work represents a step to deal with stellar structure using a pure geometric approach. A geometric field theory is used to construct a model for a spherically symmetric configuration. The model obtained can be considered as a pure geometric one in the sense that the tensor describing the material distributi... |
1706.08850 | Hongsheng Zhang | Hongsheng Zhang | Naked singularity, firewall, and Hawking radiation | 6 pages, 1 fig | Scientific Reports 7, Article number: 4000 (2017) | 10.1038/s41598-017-03854-y | null | gr-qc hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | Spacetime singularity has always been of interest since the proof of the
Penrose-Hawking singularity theorem. Naked singularity naturally emerges from
reasonable initial conditions in the collapsing process. A recent interesting
approach in black hole information problem implies that we need a firewall to
break the s... | [
{
"created": "Mon, 26 Jun 2017 03:14:44 GMT",
"version": "v1"
}
] | 2017-06-28 | [
[
"Zhang",
"Hongsheng",
""
]
] | Spacetime singularity has always been of interest since the proof of the Penrose-Hawking singularity theorem. Naked singularity naturally emerges from reasonable initial conditions in the collapsing process. A recent interesting approach in black hole information problem implies that we need a firewall to break the sur... |
gr-qc/0203021 | Sergio Dain | S. Dain | Asymptotically flat and regular Cauchy data | 22 pages, 14 figures in eps format, LaTeX 2e, springer style files.
To appear in the proceedings of the Tuebingen conference on conformal
structure of space-time, J. Frauendiener, H. Friedrich, eds, Springer Lecture
Notes in Physics | Lect.Notes Phys. 604 (2002) 161-182 | null | null | gr-qc | null | I describe the construction of a large class of asymptotically flat initial
data with non-vanishing mass and angular momentum for which the metric and the
extrinsic curvature have asymptotic expansions at space-like infinity in terms
of powers of a radial coordinate. I emphasize the motivations and the main
ideas beh... | [
{
"created": "Wed, 6 Mar 2002 14:32:59 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dain",
"S.",
""
]
] | I describe the construction of a large class of asymptotically flat initial data with non-vanishing mass and angular momentum for which the metric and the extrinsic curvature have asymptotic expansions at space-like infinity in terms of powers of a radial coordinate. I emphasize the motivations and the main ideas behin... |
gr-qc/0606072 | Gert Brodin | Mats Forsberg, Gert Brodin, Mattias Marklund, Padma K. Shukla and
Joachim Moortgat | Nonlinear Interactions Between Gravitational Radiation and Modified
Alfven Modes in Astrophysical Dusty Plasmas | A few typos corrected. Published in Phys. Rev. D | Phys.Rev.D74:064014,2006 | 10.1103/PhysRevD.74.064014 | null | gr-qc | null | We present an investigation of nonlinear interactions between Gravitational
Radiation and modified Alfv\'{e}n modes in astrophysical dusty plasmas.
Assuming that stationary charged dust grains form neutralizing background in an
electron-ion-dust plasma, we obtain the three wave coupling coefficients, and
calculate th... | [
{
"created": "Fri, 16 Jun 2006 08:38:14 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Aug 2006 08:43:00 GMT",
"version": "v2"
},
{
"created": "Tue, 19 Sep 2006 11:52:01 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Forsberg",
"Mats",
""
],
[
"Brodin",
"Gert",
""
],
[
"Marklund",
"Mattias",
""
],
[
"Shukla",
"Padma K.",
""
],
[
"Moortgat",
"Joachim",
""
]
] | We present an investigation of nonlinear interactions between Gravitational Radiation and modified Alfv\'{e}n modes in astrophysical dusty plasmas. Assuming that stationary charged dust grains form neutralizing background in an electron-ion-dust plasma, we obtain the three wave coupling coefficients, and calculate the ... |
2106.05552 | Kaishu Saito | Kaishu Saito, Jiro Soda, Hirotaka Yoshino | Universal $10^{20}$Hz stochastic gravitational waves from photon spheres
of black holes | 6 pages, 2 figures | Phys. Rev. D 104, 063040 (2021) | 10.1103/PhysRevD.104.063040 | KOBE-COSMO-21-13, OCU-PHYS-540, AP-GR-168 | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that photon spheres of supermassive black holes generate
high-frequency stochastic gravitational waves through the photon-graviton
conversion. Remarkably, the frequency is universally determined as
$m_e\sqrt{m_e /m_p} \simeq 10^{20} \text{Hz}$ in terms of the proton mass $m_p$
and the electron mass $m_e$.
I... | [
{
"created": "Thu, 10 Jun 2021 07:27:12 GMT",
"version": "v1"
}
] | 2021-09-29 | [
[
"Saito",
"Kaishu",
""
],
[
"Soda",
"Jiro",
""
],
[
"Yoshino",
"Hirotaka",
""
]
] | We show that photon spheres of supermassive black holes generate high-frequency stochastic gravitational waves through the photon-graviton conversion. Remarkably, the frequency is universally determined as $m_e\sqrt{m_e /m_p} \simeq 10^{20} \text{Hz}$ in terms of the proton mass $m_p$ and the electron mass $m_e$. It tu... |
0809.0546 | Hamid Reza Sepangi | Malihe Heydari-Fard and Hamid R. Sepangi | Role of Chaplygin gas as geometrical dark energy in anisotropic brane
gravity | 12 pages, 4 figures | Phys.Rev.D78:064007,2008 | 10.1103/PhysRevD.78.064007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider an anisotropic brane-world model with Bianchi type I and V
geometry, without mirror symmetry or any form of junction conditions. The
generalized Chaplygin gas, which interpolates between a high density
relativistic era and a non-relativistic matter phase, is a popular candidate
for the present accelerated... | [
{
"created": "Wed, 3 Sep 2008 04:57:39 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Heydari-Fard",
"Malihe",
""
],
[
"Sepangi",
"Hamid R.",
""
]
] | We consider an anisotropic brane-world model with Bianchi type I and V geometry, without mirror symmetry or any form of junction conditions. The generalized Chaplygin gas, which interpolates between a high density relativistic era and a non-relativistic matter phase, is a popular candidate for the present accelerated e... |
1005.3673 | Luca Parisi Ph.D. | Rosangela Canonico and Luca Parisi | Stability of the Einstein Static Universe in open cosmological models | 6 pages, 4 figures, minor changes; references added | Phys.Rev.D82:064005,2010 | 10.1103/PhysRevD.82.064005 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The stability properties of the Einstein Static solution of General
Relativity are altered when corrective terms arising from modification of the
underlying gravitational theory appear in the cosmological equations. In this
paper the existence and stability of static solutions are considered in the
framework of two r... | [
{
"created": "Thu, 20 May 2010 12:05:34 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Sep 2010 16:27:00 GMT",
"version": "v2"
}
] | 2014-11-21 | [
[
"Canonico",
"Rosangela",
""
],
[
"Parisi",
"Luca",
""
]
] | The stability properties of the Einstein Static solution of General Relativity are altered when corrective terms arising from modification of the underlying gravitational theory appear in the cosmological equations. In this paper the existence and stability of static solutions are considered in the framework of two rec... |
1602.01861 | Simone Speziale | Miklos L{\aa}ngvik and Simone Speziale | Twisted geometries, twistors and conformal transformations | 21 pages. v2 improved text, two equations added, typos corrected,
updated references | Phys. Rev. D 94, 024050 (2016) | 10.1103/PhysRevD.94.024050 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The twisted geometries of spin network states are described by simple
twistors, isomorphic to null twistors with a time-like direction singled out.
The isomorphism depends on the Immirzi parameter, and reduces to the identity
when the parameter goes to infinity. Using this twistorial representation we
study the actio... | [
{
"created": "Thu, 4 Feb 2016 21:52:05 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Jul 2016 09:00:16 GMT",
"version": "v2"
}
] | 2016-08-03 | [
[
"Långvik",
"Miklos",
""
],
[
"Speziale",
"Simone",
""
]
] | The twisted geometries of spin network states are described by simple twistors, isomorphic to null twistors with a time-like direction singled out. The isomorphism depends on the Immirzi parameter, and reduces to the identity when the parameter goes to infinity. Using this twistorial representation we study the action ... |
1601.07619 | Jeremy Leach | Jeremy Leach | Non-constant mean curvature trumpet solutions for the Einstein
constraint equations | null | null | 10.1088/0264-9381/33/14/145001 | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove the existence of a large class of initial data for the vacuum
Einstein equations which possess a finite number of asymptotically Euclidean
and asymptotically conformally cylindrical or periodic ends. Aside from being
asymptotically constant, only mild conditions on the mean curvature of these
initial data se... | [
{
"created": "Thu, 28 Jan 2016 01:43:11 GMT",
"version": "v1"
}
] | 2016-07-06 | [
[
"Leach",
"Jeremy",
""
]
] | We prove the existence of a large class of initial data for the vacuum Einstein equations which possess a finite number of asymptotically Euclidean and asymptotically conformally cylindrical or periodic ends. Aside from being asymptotically constant, only mild conditions on the mean curvature of these initial data sets... |
gr-qc/0201069 | Stanislav Alexeyev | S. Alexeyev (1,2), A. Barrau (1), G. Boudoul (1), O. Khovanskaya (2),
M. Sazhin (2), ((1) Institut des Sciences Nucleaires, Grenoble, France, (2)
Sternberg Astronomical Institute, Moscow, Russia) | Black Hole Relics in String Gravity: Last Stages of Hawking Evaporation | 15 pages, accepted to Class. Quant. Grav | Class.Quant.Grav.19:4431-4444,2002 | 10.1088/0264-9381/19/16/314 | null | gr-qc astro-ph | null | One of the most intriguing problem of modern physics is the question of the
endpoint of black hole evaporation. Based on Einstein-dilaton-Gauss-Bonnet four
dimensional string gravity model we show that black holes do not disappear and
that the end of the evaporation process leaves some relic. The possibility of
exper... | [
{
"created": "Mon, 21 Jan 2002 17:50:54 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Jan 2002 18:45:11 GMT",
"version": "v2"
},
{
"created": "Wed, 27 Mar 2002 20:15:01 GMT",
"version": "v3"
},
{
"created": "Thu, 28 Mar 2002 11:22:51 GMT",
"version": "v4"
},
{
"c... | 2008-11-26 | [
[
"Alexeyev",
"S.",
""
],
[
"Barrau",
"A.",
""
],
[
"Boudoul",
"G.",
""
],
[
"Khovanskaya",
"O.",
""
],
[
"Sazhin",
"M.",
""
]
] | One of the most intriguing problem of modern physics is the question of the endpoint of black hole evaporation. Based on Einstein-dilaton-Gauss-Bonnet four dimensional string gravity model we show that black holes do not disappear and that the end of the evaporation process leaves some relic. The possibility of experim... |
1506.02939 | Felipe Asenjo | Sergio A. Hojman and Felipe A. Asenjo | Supersymmetric Majorana Quantum Cosmologies | 5 pages | null | 10.1103/PhysRevD.92.083518 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Einstein equations for an isotropic and homogeneous
Friedmann--Robertson--Walker Universe in the presence of a quintessence scalar
field are shown to be described in a unified way, formally identical to the
dynamics of a relativistic particle moving on a two--dimensional spacetime. The
correct Lagrangian for the ... | [
{
"created": "Tue, 9 Jun 2015 14:47:35 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Oct 2015 18:24:58 GMT",
"version": "v2"
}
] | 2015-11-04 | [
[
"Hojman",
"Sergio A.",
""
],
[
"Asenjo",
"Felipe A.",
""
]
] | The Einstein equations for an isotropic and homogeneous Friedmann--Robertson--Walker Universe in the presence of a quintessence scalar field are shown to be described in a unified way, formally identical to the dynamics of a relativistic particle moving on a two--dimensional spacetime. The correct Lagrangian for the sy... |
1005.4136 | Gonzalo Olmo | Carlos Barragan, Gonzalo J. Olmo | Isotropic and Anisotropic Bouncing Cosmologies in Palatini Gravity | 25 pages, 7 figures | Phys.Rev.D82:084015,2010 | 10.1103/PhysRevD.82.084015 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study isotropic and anisotropic (Bianchi I) cosmologies in Palatini $f(R)$
and $f(R,R_{\mu\nu}R^{\mu\nu})$ theories of gravity and consider the existence
of non-singular bouncing solutions in the early universe. We find that all
$f(R)$ models with isotropic bouncing solutions develop shear singularities in
the ani... | [
{
"created": "Sat, 22 May 2010 16:03:35 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Barragan",
"Carlos",
""
],
[
"Olmo",
"Gonzalo J.",
""
]
] | We study isotropic and anisotropic (Bianchi I) cosmologies in Palatini $f(R)$ and $f(R,R_{\mu\nu}R^{\mu\nu})$ theories of gravity and consider the existence of non-singular bouncing solutions in the early universe. We find that all $f(R)$ models with isotropic bouncing solutions develop shear singularities in the aniso... |
1005.2798 | Muhammad Sharif | M. Sharif and M. Farasat Shamir | Non-Vacuum Bianchi Types I and V in f(R) Gravity | 15 pages, accepted for publication in Gen. Realtiv. Gravit | Gen. Rel. Grav.42:2643-2655, 2010 | 10.1007/s10714-010-1005-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent paper \cite{1}, we have studied the vacuum solutions of Bianchi
types I and V spacetimes in the framework of metric f(R) gravity. Here we
extend this work to perfect fluid solutions. For this purpose, we take stiff
matter to find energy density and pressure of the universe. In particular, we
find two exac... | [
{
"created": "Mon, 17 May 2010 02:36:02 GMT",
"version": "v1"
}
] | 2010-10-28 | [
[
"Sharif",
"M.",
""
],
[
"Shamir",
"M. Farasat",
""
]
] | In a recent paper \cite{1}, we have studied the vacuum solutions of Bianchi types I and V spacetimes in the framework of metric f(R) gravity. Here we extend this work to perfect fluid solutions. For this purpose, we take stiff matter to find energy density and pressure of the universe. In particular, we find two exact ... |
2207.06222 | Sergio A. Ortega | Jose A. R. Cembranos, Luis J. Garay, Sergio A. Ortega | Causal structure of accelerating black holes | 12 pages, 5 figures | null | 10.1140/epjc/s10052-022-10760-9 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Accelerating black holes are described by the so-called C-metric. In this
work, we analyse the causal structure of such black holes by using null
geodesics. We construct explicitly the relevant Penrose diagrams. First, we
recover well-known results associated with the sub-accelerating black holes.
Then, we extend the... | [
{
"created": "Wed, 13 Jul 2022 14:23:55 GMT",
"version": "v1"
}
] | 2022-09-21 | [
[
"Cembranos",
"Jose A. R.",
""
],
[
"Garay",
"Luis J.",
""
],
[
"Ortega",
"Sergio A.",
""
]
] | Accelerating black holes are described by the so-called C-metric. In this work, we analyse the causal structure of such black holes by using null geodesics. We construct explicitly the relevant Penrose diagrams. First, we recover well-known results associated with the sub-accelerating black holes. Then, we extend the s... |
2108.08640 | Matheus do Carmo Teodoro | Matheus C. Teodoro, Lucas G. Collodel, Daniela Doneva, Jutta Kunz,
Petya Nedkova and Stoytcho Yazadjiev | Polish Doughnuts around Scalarized Kerr Black Holes | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we aim to investigate non-mainstream thick tori configurations
around Kerr Black Holes with Scalar Hair (KBHsSH). For that goal, we provide a
first approach using constant specific angular momentum non-self-gravitating
Polish doughnuts. Through a series of examples, we show the feasibility of new
topolog... | [
{
"created": "Thu, 19 Aug 2021 12:05:54 GMT",
"version": "v1"
}
] | 2021-08-20 | [
[
"Teodoro",
"Matheus C.",
""
],
[
"Collodel",
"Lucas G.",
""
],
[
"Doneva",
"Daniela",
""
],
[
"Kunz",
"Jutta",
""
],
[
"Nedkova",
"Petya",
""
],
[
"Yazadjiev",
"Stoytcho",
""
]
] | In this work we aim to investigate non-mainstream thick tori configurations around Kerr Black Holes with Scalar Hair (KBHsSH). For that goal, we provide a first approach using constant specific angular momentum non-self-gravitating Polish doughnuts. Through a series of examples, we show the feasibility of new topologie... |
1507.01149 | Hanno Sahlmann | Jerzy Lewandowski and Hanno Sahlmann | Loop quantum gravity coupled to a scalar field | 18 pages | Phys. Rev. D 93, 024042 (2016) | 10.1103/PhysRevD.93.024042 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reconsider the Rovelli-Smolin model of gravity coupled to the Klein-Gordon
time field with an eye towards capturing the degrees of freedom of the scalar
field lost in the framework in which time is deparametrized by the scalar
field. Several new results for loop quantum gravity are obtained:
(i) a Hilbert space ... | [
{
"created": "Sat, 4 Jul 2015 21:48:03 GMT",
"version": "v1"
}
] | 2016-02-03 | [
[
"Lewandowski",
"Jerzy",
""
],
[
"Sahlmann",
"Hanno",
""
]
] | We reconsider the Rovelli-Smolin model of gravity coupled to the Klein-Gordon time field with an eye towards capturing the degrees of freedom of the scalar field lost in the framework in which time is deparametrized by the scalar field. Several new results for loop quantum gravity are obtained: (i) a Hilbert space for ... |
1108.1816 | Anil Zenginoglu C | An{\i}l Zengino\u{g}lu and Gaurav Khanna | Null infinity waveforms from extreme-mass-ratio inspirals in Kerr
spacetime | 14 pages, 7 figures | Phys. Rev. X 1, 021017 (2011) | 10.1103/PhysRevX.1.021017 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe the hyperboloidal compactification for Teukolsky equations in
Kerr spacetime. We include null infinity on the numerical grid by attaching a
hyperboloidal layer to a compact domain surrounding the rotating black hole and
the orbit of an inspiralling point particle. This technique allows us to study,
for th... | [
{
"created": "Mon, 8 Aug 2011 21:09:00 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Dec 2011 20:52:34 GMT",
"version": "v2"
}
] | 2011-12-13 | [
[
"Zenginoğlu",
"Anıl",
""
],
[
"Khanna",
"Gaurav",
""
]
] | We describe the hyperboloidal compactification for Teukolsky equations in Kerr spacetime. We include null infinity on the numerical grid by attaching a hyperboloidal layer to a compact domain surrounding the rotating black hole and the orbit of an inspiralling point particle. This technique allows us to study, for the ... |
2103.00700 | Lance Williams | G. Hathaway and L.L. Williams | Null-result test for effect on weight from large electrostatic charge | null | Physics 2021, 3(2), 160-172 | null | null | gr-qc physics.class-ph | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We report test results searching for an effect of electrostatic charge on
weight. For conducting test objects of mass of order 1 kilogram, we found no
effect on weight, for potentials ranging from 10 V to 200 kV, corresponding to
charge states ranging from $10^{-9}$ to over $10^{-5}$ coulombs, and for both
polarities... | [
{
"created": "Mon, 1 Mar 2021 02:22:10 GMT",
"version": "v1"
}
] | 2021-03-30 | [
[
"Hathaway",
"G.",
""
],
[
"Williams",
"L. L.",
""
]
] | We report test results searching for an effect of electrostatic charge on weight. For conducting test objects of mass of order 1 kilogram, we found no effect on weight, for potentials ranging from 10 V to 200 kV, corresponding to charge states ranging from $10^{-9}$ to over $10^{-5}$ coulombs, and for both polarities, ... |
gr-qc/0010003 | Luis Herrera | L. Herrera and J. L. Hernandez Pastora | Measuring multipole moments of Weyl metrics by means of gyroscopes | 18 pages Latex, To appear in J.Math.Phys | J.Math.Phys.41:7544-7555,2000 | 10.1063/1.1319517 | null | gr-qc astro-ph | null | Using the technique of Rindler and Perlick we calculate the total precession
per revolution of a gyroscope circumventing the source of Weyl metrics. We
establish thereby a link between the multipole moments of the source and an
``observable'' quantity. Special attention deserves the case of the
gamma-metric. As an ex... | [
{
"created": "Mon, 2 Oct 2000 07:50:14 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Herrera",
"L.",
""
],
[
"Pastora",
"J. L. Hernandez",
""
]
] | Using the technique of Rindler and Perlick we calculate the total precession per revolution of a gyroscope circumventing the source of Weyl metrics. We establish thereby a link between the multipole moments of the source and an ``observable'' quantity. Special attention deserves the case of the gamma-metric. As an exte... |
1910.01351 | Luca Guido Molinari | Luca Guido Molinari, Adriano Tacchini and Carlo Alberto Mantica | On the uniqueness of a shear-vorticity-acceleration-free velocity field
in space-times | 11 pages | General Relativity and Gravitation (2019) 51:127 | 10.1007/s10714-019-2607-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove that in space-times a velocity field that is shear, vorticity and
acceleration-free, if any, is unique up to reflection, with these exceptions:
generalized Robertson-Walker space-times whose space sub-manifold is warped,
and twisted space-times (the scale function is space-time dependent) whose
space sub-man... | [
{
"created": "Thu, 3 Oct 2019 08:22:19 GMT",
"version": "v1"
}
] | 2019-10-04 | [
[
"Molinari",
"Luca Guido",
""
],
[
"Tacchini",
"Adriano",
""
],
[
"Mantica",
"Carlo Alberto",
""
]
] | We prove that in space-times a velocity field that is shear, vorticity and acceleration-free, if any, is unique up to reflection, with these exceptions: generalized Robertson-Walker space-times whose space sub-manifold is warped, and twisted space-times (the scale function is space-time dependent) whose space sub-manif... |
1202.2732 | Marc Diaz-Aguilo Dr. | Marc Diaz-Aguil\'o, Ignacio Mateos, Juan Ramos-Castro, Alberto Lobo,
Enrique Garc\'ia-Berro | Design of the magnetic diagnostics unit onboard LISA Pathfinder | 8 pages, 9 figures, Aerospace Science and Technology, accepted on
Feb, 13th 2012 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | LISA (Laser Interferometer Space Antenna) is a joint mission of ESA and NASA
which aims to be the first space-borne gravita- tional wave observatory. Due to
the high complexity and technological challenges that LISA will face, ESA
decided to launch a technological demonstrator, LISA Pathfinder. The payload of
LISA Pa... | [
{
"created": "Mon, 13 Feb 2012 13:55:42 GMT",
"version": "v1"
}
] | 2012-02-14 | [
[
"Diaz-Aguiló",
"Marc",
""
],
[
"Mateos",
"Ignacio",
""
],
[
"Ramos-Castro",
"Juan",
""
],
[
"Lobo",
"Alberto",
""
],
[
"García-Berro",
"Enrique",
""
]
] | LISA (Laser Interferometer Space Antenna) is a joint mission of ESA and NASA which aims to be the first space-borne gravita- tional wave observatory. Due to the high complexity and technological challenges that LISA will face, ESA decided to launch a technological demonstrator, LISA Pathfinder. The payload of LISA Path... |
2212.05585 | Salah Nasri | Hemza Azri and Salah Nasri | Gravity from the Determinant of the Energy-Momentum: Astrophysical
Implications | to appear in PLB | null | 10.1016/j.physletb.2022.137626 | null | gr-qc astro-ph.HE | http://creativecommons.org/publicdomain/zero/1.0/ | Determinants of the second-rank tensors stand useful in forming generally
invariant terms as in the case of the volume element of the gravitational
actions. Here, we extend the action of the matter fields by an arbitrary
function $f(D)$ of the determinants of their energy-momentum, and the metric,
$D=|\textbf{det}.T|... | [
{
"created": "Sun, 11 Dec 2022 19:44:52 GMT",
"version": "v1"
}
] | 2023-01-04 | [
[
"Azri",
"Hemza",
""
],
[
"Nasri",
"Salah",
""
]
] | Determinants of the second-rank tensors stand useful in forming generally invariant terms as in the case of the volume element of the gravitational actions. Here, we extend the action of the matter fields by an arbitrary function $f(D)$ of the determinants of their energy-momentum, and the metric, $D=|\textbf{det}.T|/|... |
1603.01464 | Mariafelicia De Laurentis Professor | Fabrizio Tamburini, Mariafelicia De Laurentis, Lorenzo Amati, Bo
Thid\'e | General relativistic massive vector field effects in Gamma Ray Burst
production | 5 pages, 1 figure | null | 10.1103/PhysRevD.96.104003 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To explain the extremely high energy release, $>10^{53}$~erg, suggested by
the observations of some Gamma Ray Bursts (GRBs) we propose a new energy
extraction mechanism from the rotation energy of a Kerr-Newman black hole (BH)
by a massive photon field. Numerical results show that this mechanism is stable
with respec... | [
{
"created": "Mon, 29 Feb 2016 15:09:55 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Mar 2016 21:06:51 GMT",
"version": "v2"
}
] | 2017-11-22 | [
[
"Tamburini",
"Fabrizio",
""
],
[
"De Laurentis",
"Mariafelicia",
""
],
[
"Amati",
"Lorenzo",
""
],
[
"Thidé",
"Bo",
""
]
] | To explain the extremely high energy release, $>10^{53}$~erg, suggested by the observations of some Gamma Ray Bursts (GRBs) we propose a new energy extraction mechanism from the rotation energy of a Kerr-Newman black hole (BH) by a massive photon field. Numerical results show that this mechanism is stable with respect ... |
gr-qc/9904042 | Wai-Mo Suen | Ian Redmount, Wai-Mo Suen and Kenneth Young | Ambiguities in Quantizing a Classical System | 20 pages | null | null | null | gr-qc | null | One classical theory, as determined by an equation of motion or set of
classical trajectories, can correspond to many unitarily {\em in}equivalent
quantum theories upon canonical quantization. This arises from a remarkable
ambiguity, not previously investigated, in the construction of the classical
(and hence the qua... | [
{
"created": "Mon, 19 Apr 1999 00:42:24 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Redmount",
"Ian",
""
],
[
"Suen",
"Wai-Mo",
""
],
[
"Young",
"Kenneth",
""
]
] | One classical theory, as determined by an equation of motion or set of classical trajectories, can correspond to many unitarily {\em in}equivalent quantum theories upon canonical quantization. This arises from a remarkable ambiguity, not previously investigated, in the construction of the classical (and hence the quant... |
1011.2143 | Kathlynne Tullney Joy | C. Gemmel, W. Heil, S. Karpuk, K. Lenz, Yu. Sobolev, K. Tullney, M.
Burghoff, W. Kilian, S. Knappe-Gr\"uneberg, W. M\"uller, A. Schnabel, F.
Seifert, L. Trahms, U. Schmidt | Limit on Lorentz and CPT violation of the bound Neutron Using a Free
Precession 3He/129Xe co-magnetometer | 5 pages, 4 figures | Phys.Rev.D82:111901,2010 | 10.1103/PhysRevD.82.111901 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on the search for Lorentz violating sidereal variations of the
frequency difference of co-located spin-species while the Earth and hence the
laboratory reference frame rotates with respect to a relic background field.
The co-magnetometer used is based on the detection of freely precessing nuclear
spins from... | [
{
"created": "Tue, 9 Nov 2010 16:42:06 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Nov 2010 14:08:03 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Jan 2011 12:37:32 GMT",
"version": "v3"
}
] | 2011-02-02 | [
[
"Gemmel",
"C.",
""
],
[
"Heil",
"W.",
""
],
[
"Karpuk",
"S.",
""
],
[
"Lenz",
"K.",
""
],
[
"Sobolev",
"Yu.",
""
],
[
"Tullney",
"K.",
""
],
[
"Burghoff",
"M.",
""
],
[
"Kilian",
"W.",
""
... | We report on the search for Lorentz violating sidereal variations of the frequency difference of co-located spin-species while the Earth and hence the laboratory reference frame rotates with respect to a relic background field. The co-magnetometer used is based on the detection of freely precessing nuclear spins from p... |
2406.08159 | Jibril Ben Achour | Jibril Ben Achour and Hugo Roussille | Quadratic perturbations of the Schwarzschild black hole: The
algebraically special sector | 17+8 pages | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We investigate quadratic algebraically special perturbations (ASPs) of the
Schwarzschild black hole. Their dynamics are derived from the expansion up to
second order in perturbation of the most general algebraically special twisting
vacuum solution of general relativity. Following this strategy, we present
analytical... | [
{
"created": "Wed, 12 Jun 2024 12:50:33 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Jun 2024 14:54:58 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Jul 2024 11:43:34 GMT",
"version": "v3"
}
] | 2024-07-09 | [
[
"Achour",
"Jibril Ben",
""
],
[
"Roussille",
"Hugo",
""
]
] | We investigate quadratic algebraically special perturbations (ASPs) of the Schwarzschild black hole. Their dynamics are derived from the expansion up to second order in perturbation of the most general algebraically special twisting vacuum solution of general relativity. Following this strategy, we present analytical e... |
1111.0214 | Angus Prain | Stefano Liberati, Angus Prain, Matt Visser | Quantum vacuum radiation in optical glass | 9 pages, 3 figures | Phys. Rev. D 85(2012) 084014 | 10.1103/PhysRevD.85.084014 | null | gr-qc physics.optics quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recent experimental claim of the detection of analogue Hawking radiation in
an optical system [PRL 105 (2010) 203901] has led to some controversy [PRL 107
(2011) 149401, 149402]. While this experiment strongly suggests some form of
particle creation from the quantum vacuum (and hence it is per se very
interesting),... | [
{
"created": "Tue, 1 Nov 2011 15:10:02 GMT",
"version": "v1"
}
] | 2012-06-08 | [
[
"Liberati",
"Stefano",
""
],
[
"Prain",
"Angus",
""
],
[
"Visser",
"Matt",
""
]
] | A recent experimental claim of the detection of analogue Hawking radiation in an optical system [PRL 105 (2010) 203901] has led to some controversy [PRL 107 (2011) 149401, 149402]. While this experiment strongly suggests some form of particle creation from the quantum vacuum (and hence it is per se very interesting), i... |
1612.03322 | Armen M. Gulian | A. Gulian, J. Foreman, V. Nikoghosyan, L. Sica, J. Tollaksen, S.
Nussinov | A new approach to ultrasensitive gravitational wave detection | 10 pages, 4 figures | null | null | null | gr-qc cond-mat.supr-con physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We suggest here a method to detect gravitational waves (GW) different from
the interferometric approach. It is based on two critical steps: conversion of
the GW action into rotational motion and subsequent conversion into electric
current. The ability to detect extremely tiny currents empowers this suggested
approach... | [
{
"created": "Sat, 10 Dec 2016 16:58:49 GMT",
"version": "v1"
}
] | 2016-12-13 | [
[
"Gulian",
"A.",
""
],
[
"Foreman",
"J.",
""
],
[
"Nikoghosyan",
"V.",
""
],
[
"Sica",
"L.",
""
],
[
"Tollaksen",
"J.",
""
],
[
"Nussinov",
"S.",
""
]
] | We suggest here a method to detect gravitational waves (GW) different from the interferometric approach. It is based on two critical steps: conversion of the GW action into rotational motion and subsequent conversion into electric current. The ability to detect extremely tiny currents empowers this suggested approach i... |
1606.00953 | Neil J. Cornish | Neil J. Cornish | Rapid and reliable sky localization of gravitational wave sources | 5 pages, 4 figures | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The first detection of gravitational waves by LIGO from the merger of two
compact objects has sparked new interest in detecting electromagnetic
counterparts to these violent events. For mergers involving neutron stars, it
is thought that prompt high-energy emission in gamma rays and x-rays will be
followed days to we... | [
{
"created": "Fri, 3 Jun 2016 02:37:22 GMT",
"version": "v1"
}
] | 2016-06-06 | [
[
"Cornish",
"Neil J.",
""
]
] | The first detection of gravitational waves by LIGO from the merger of two compact objects has sparked new interest in detecting electromagnetic counterparts to these violent events. For mergers involving neutron stars, it is thought that prompt high-energy emission in gamma rays and x-rays will be followed days to week... |
gr-qc/0609083 | Joan Sola | Javier Grande, Joan Sola, Hrvoje Stefancic | Composite dark energy: cosmon models with running cosmological term and
gravitational coupling | LaTeX, 17 pages, 4 figures. Extended discussion, references added.
Accepted in Physics Letters B | Phys.Lett.B645:236-244,2007 | 10.1016/j.physletb.2006.12.040 | UB-ECM-PF-06/24 | gr-qc astro-ph hep-ph hep-th | null | In the recent literature on dark energy (DE) model building we have learnt
that cosmologies with variable cosmological parameters can mimic more
traditional DE pictures exclusively based on scalar fields (e.g. quintessence
and phantom). In a previous work we have illustrated this situation within the
context of a ren... | [
{
"created": "Wed, 20 Sep 2006 17:07:26 GMT",
"version": "v1"
},
{
"created": "Sat, 16 Dec 2006 10:59:12 GMT",
"version": "v2"
}
] | 2010-11-04 | [
[
"Grande",
"Javier",
""
],
[
"Sola",
"Joan",
""
],
[
"Stefancic",
"Hrvoje",
""
]
] | In the recent literature on dark energy (DE) model building we have learnt that cosmologies with variable cosmological parameters can mimic more traditional DE pictures exclusively based on scalar fields (e.g. quintessence and phantom). In a previous work we have illustrated this situation within the context of a renor... |
2207.07312 | Jibril Ben Achour | Jibril Ben Achour, Etera R. Livine, Daniele Oriti, Goffredo Piani | Schr\"{o}dinger Symmetry in Gravitational Mini-Superspaces | 33+4 pages | Universe, Special Issue on Gravitation - 2023 | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We prove that the simplest gravitational symmetry reduced models describing
cosmology and black holes mechanics are invariant under the Schr\"{o}dinger
group. We consider the flat FRW cosmology filled with a massless scalar field
and the Schwarzschild black hole mechanics, construct their conserved charges
using the ... | [
{
"created": "Fri, 15 Jul 2022 07:02:31 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Mar 2023 18:12:54 GMT",
"version": "v2"
},
{
"created": "Sat, 25 Nov 2023 13:37:35 GMT",
"version": "v3"
}
] | 2023-11-28 | [
[
"Achour",
"Jibril Ben",
""
],
[
"Livine",
"Etera R.",
""
],
[
"Oriti",
"Daniele",
""
],
[
"Piani",
"Goffredo",
""
]
] | We prove that the simplest gravitational symmetry reduced models describing cosmology and black holes mechanics are invariant under the Schr\"{o}dinger group. We consider the flat FRW cosmology filled with a massless scalar field and the Schwarzschild black hole mechanics, construct their conserved charges using the Ei... |
2306.12097 | Shao-Wen Wei | Xu Ye, Chao-Hui Wang, Shao-Wen Wei | Extracting spinning wormhole energy via magnetic reconnection | 15 pages and 8 figures, references added | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Magnetic reconnection has been extensively shown to be a promising approach
to extract spinning black hole energy. In this paper, we focus on extracting
spinning wormhole energy via such mechanism. The study shows that it is indeed
possible to extract rotating energy from a spinning wormhole with small
regularization... | [
{
"created": "Wed, 21 Jun 2023 08:22:31 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Jul 2023 01:38:00 GMT",
"version": "v2"
}
] | 2023-07-06 | [
[
"Ye",
"Xu",
""
],
[
"Wang",
"Chao-Hui",
""
],
[
"Wei",
"Shao-Wen",
""
]
] | Magnetic reconnection has been extensively shown to be a promising approach to extract spinning black hole energy. In this paper, we focus on extracting spinning wormhole energy via such mechanism. The study shows that it is indeed possible to extract rotating energy from a spinning wormhole with small regularization p... |
1703.03493 | Simone Mastrogiovanni | S. Mastrogiovanni, P. Astone, S. D'Antonio, S. Frasca, G. Intini, P.
Leaci, A. Miller, C. Palomba, O.J. Piccinni, A. Singhal | An improved algorithm for narrow-band searches of continuous
gravitational waves | 19 pages, 8 figures, 6 tables, submitted to CQG | null | 10.1088/1361-6382/aa744f | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Continuous gravitational waves signals, emitted by asymmetric spinning
neutron stars, are among the main targets of current detectors like Advanced
LIGO and Virgo. In the case of sources, like pulsars, which rotational
parameters are measured through electromagnetic observations, typical searches
assume that the grav... | [
{
"created": "Fri, 10 Mar 2017 00:37:51 GMT",
"version": "v1"
}
] | 2017-06-28 | [
[
"Mastrogiovanni",
"S.",
""
],
[
"Astone",
"P.",
""
],
[
"D'Antonio",
"S.",
""
],
[
"Frasca",
"S.",
""
],
[
"Intini",
"G.",
""
],
[
"Leaci",
"P.",
""
],
[
"Miller",
"A.",
""
],
[
"Palomba",
"C.",... | Continuous gravitational waves signals, emitted by asymmetric spinning neutron stars, are among the main targets of current detectors like Advanced LIGO and Virgo. In the case of sources, like pulsars, which rotational parameters are measured through electromagnetic observations, typical searches assume that the gravit... |
1904.03460 | Zhi-Chao Zhao | Zhi-Chao Zhao, Hai-Nan Lin and Zhe Chang | The prospects of gravitational waves on constraining the anisotropy of
the Universe | 5 pages, 5 figures | Chinese Physics C 43 (2019) 075102 | 10.1088/1674-1137/43/7/075102 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The observation of GW150914 indicated a new independent measurement of the
luminosity distance of a gravitational wave event. In this paper, we constrain
the anisotropy of the Universe by using gravitational wave events. We simulate
hundreds of events of binary neutron star merging that may be observed by
Einstein Te... | [
{
"created": "Sat, 6 Apr 2019 14:50:09 GMT",
"version": "v1"
}
] | 2019-08-19 | [
[
"Zhao",
"Zhi-Chao",
""
],
[
"Lin",
"Hai-Nan",
""
],
[
"Chang",
"Zhe",
""
]
] | The observation of GW150914 indicated a new independent measurement of the luminosity distance of a gravitational wave event. In this paper, we constrain the anisotropy of the Universe by using gravitational wave events. We simulate hundreds of events of binary neutron star merging that may be observed by Einstein Tele... |
2001.09217 | Yuri Bonder | Yuri Bonder and Christian Peterson | Explicit Lorentz violation in a static and spherically-symmetric
spacetime | 6 double-column pages | Phys. Rev. D 101, 064056 (2020) | 10.1103/PhysRevD.101.064056 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Lorentz violation is motivated by quantum gravity and it is generically
described by nondynamical tensors. In this work a Lorentz violating extension
of general relativity is studied where a nondynamical tensor couples to the
Weyl tensor. A family of static and spherically symmetric solutions in vacuum
is found, conf... | [
{
"created": "Fri, 24 Jan 2020 22:36:21 GMT",
"version": "v1"
}
] | 2020-03-30 | [
[
"Bonder",
"Yuri",
""
],
[
"Peterson",
"Christian",
""
]
] | Lorentz violation is motivated by quantum gravity and it is generically described by nondynamical tensors. In this work a Lorentz violating extension of general relativity is studied where a nondynamical tensor couples to the Weyl tensor. A family of static and spherically symmetric solutions in vacuum is found, confir... |
1704.00780 | Lee Smolin | Lee Smolin | MOND as a regime of quantum gravity | LaTex 22 pages, one figure. Thee revision contains many small
improvements | Phys. Rev. D 96, 083523 (2017) | 10.1103/PhysRevD.96.083523 | null | gr-qc astro-ph.GA hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose that there is a regime of quantum gravity phenomena, for the case
that the cosmological constant is small and positive, which concerns phenomena
at temperatures below the deSitter temperature, or length scales larger than
the horizon. We observe that the standard form of the equivalence principle
does not ... | [
{
"created": "Mon, 3 Apr 2017 19:32:06 GMT",
"version": "v1"
},
{
"created": "Thu, 25 May 2017 15:02:14 GMT",
"version": "v2"
}
] | 2017-11-01 | [
[
"Smolin",
"Lee",
""
]
] | We propose that there is a regime of quantum gravity phenomena, for the case that the cosmological constant is small and positive, which concerns phenomena at temperatures below the deSitter temperature, or length scales larger than the horizon. We observe that the standard form of the equivalence principle does not ap... |
2006.00494 | Zbigniew Haba | Zbigniew Haba | Semi-classical Einstein equations:descend to the ground state | 20 pages | Universe 2020,6,74 | 10.3390/universe6060074 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The time-dependent cosmological term arises from the energy-momentum tensor
calculated in a state different from the ground state. We discuss the
expectation value of the energy-momentum tensor on the rhs of Einstein
equations in various (approximate)pure as well as mixed states. We apply the
classical slow-roll fiel... | [
{
"created": "Sun, 31 May 2020 11:18:07 GMT",
"version": "v1"
}
] | 2020-06-02 | [
[
"Haba",
"Zbigniew",
""
]
] | The time-dependent cosmological term arises from the energy-momentum tensor calculated in a state different from the ground state. We discuss the expectation value of the energy-momentum tensor on the rhs of Einstein equations in various (approximate)pure as well as mixed states. We apply the classical slow-roll field ... |
0906.3021 | Ivano Soares | R. Maier and I. Dami\~ao Soares | Forming Nonsingular Black Holes from Dust Collapse | 4 pages, 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dynamics of the gravitational collapse is examined in the realm of string
based formalism of D-branes that encompass General Relativity as a low energy
limit. A complete analytical solution is given to the spherically symmetric
collapse of a pure dust star, including its matching with a corrected
Schwarzschild ex... | [
{
"created": "Tue, 16 Jun 2009 20:18:02 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Aug 2009 22:22:36 GMT",
"version": "v2"
}
] | 2009-08-04 | [
[
"Maier",
"R.",
""
],
[
"Soares",
"I. Damião",
""
]
] | The dynamics of the gravitational collapse is examined in the realm of string based formalism of D-branes that encompass General Relativity as a low energy limit. A complete analytical solution is given to the spherically symmetric collapse of a pure dust star, including its matching with a corrected Schwarzschild exte... |
0806.1194 | Peter Kuhfittig K.F. | Peter K.F. Kuhfittig | Viable models of traversable wormholes supported by small amounts of
exotic matter | 17 pages, 2 figures, AMSTeX | Int.J.PureAppl.Math.44:467-482,2008 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Wormholes allowed by the general theory of relativity that are simultaneously
traversable by humanoid travelers are subject to severe constraints from
quantum field theory, particularly the so-called quantum inequalities, here
slightly extended. Moreover, self-collapse of such wormholes can only be
prevented by the u... | [
{
"created": "Fri, 6 Jun 2008 15:49:04 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | Wormholes allowed by the general theory of relativity that are simultaneously traversable by humanoid travelers are subject to severe constraints from quantum field theory, particularly the so-called quantum inequalities, here slightly extended. Moreover, self-collapse of such wormholes can only be prevented by the use... |
2010.05931 | Adrien Kuntz | Adrien Kuntz | Testing gravity with the two-body problem | PhD thesis | null | null | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waves provide a new probe into the strong-field regime of
gravity. It is thus essential to identify the predictions of General Relativity
on the nature of the two-body problem, and to contrast them to alternative
theories. This thesis aims at comparing the predictions of General Relativity
and scalar-te... | [
{
"created": "Mon, 12 Oct 2020 18:00:31 GMT",
"version": "v1"
}
] | 2020-10-14 | [
[
"Kuntz",
"Adrien",
""
]
] | Gravitational waves provide a new probe into the strong-field regime of gravity. It is thus essential to identify the predictions of General Relativity on the nature of the two-body problem, and to contrast them to alternative theories. This thesis aims at comparing the predictions of General Relativity and scalar-tens... |
gr-qc/0207004 | D. V. Ahluwalia | D. V. Ahluwalia-Khalilova | Fermions, bosons, and locality in special relativity with two invariant
scales | Updated authorship. No other changes | Proceedings of the Fourth Tegernsee International Conference on
Particle Physics Beyond the Standard Model, BEYOND 2003, Castle Ringberg,
Germany, 9-14 June 2003, Ed. H. V. Klapdor-Kleingrothaus, pp. 503-511 | null | null | gr-qc astro-ph hep-ph hep-th | null | We present a Master equation for description of fermions and bosons for
special relativities with two invariant scales (c and lambda_P). We introduce
canonically-conjugate variables (chi^0, chi) to (epsilon, pi) of Judes-Visser.
Together, they bring in a formal element of linearity and locality in an
otherwise non-li... | [
{
"created": "Sun, 30 Jun 2002 04:34:55 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Jul 2002 23:00:33 GMT",
"version": "v2"
},
{
"created": "Tue, 9 Jul 2002 20:46:20 GMT",
"version": "v3"
},
{
"created": "Fri, 13 Jun 2003 17:22:18 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"Ahluwalia-Khalilova",
"D. V.",
""
]
] | We present a Master equation for description of fermions and bosons for special relativities with two invariant scales (c and lambda_P). We introduce canonically-conjugate variables (chi^0, chi) to (epsilon, pi) of Judes-Visser. Together, they bring in a formal element of linearity and locality in an otherwise non-line... |
gr-qc/9408003 | Margaret Gabler | Per Kraus and Frank Wilczek | Self-Interaction Correction to Black Hole Radiance | 20 pages, no figures, uses Phyzzx, IASSNS-HEP 94/61 | Nucl.Phys.B433:403-420,1995 | 10.1016/0550-3213(94)00411-7 | null | gr-qc hep-th | null | We consider the modification of the formulas for black hole radiation, due to
the self-gravitation of the radiation. This is done by truncating the coupled
particle-hole system to a small set of modes, that are plausibly the most
significant ones, and quantizing the reduced system. In this way we find that
the partic... | [
{
"created": "Tue, 2 Aug 1994 14:38:27 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kraus",
"Per",
""
],
[
"Wilczek",
"Frank",
""
]
] | We consider the modification of the formulas for black hole radiation, due to the self-gravitation of the radiation. This is done by truncating the coupled particle-hole system to a small set of modes, that are plausibly the most significant ones, and quantizing the reduced system. In this way we find that the particle... |
1301.4642 | Mahouton J. Stephane Houndjo Dr | M. J. S. Houndjo, M. E. Rodrigues, D. Momeni and R. Myrzakulov | Exploring Cylindrical Solutions in Modified f(G) Gravity | 27 pages | Canadian Journal of Physics, 2014, 92(12): 1528-1540 | 10.1139/cjp-2014-0070 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present cylindrically symmetric solutions for a type of the Gauss-Bonnet
gravity, in details. We derive the full system of the field equations and show
that there exist seven families of exact solutions for three forms of viable
models. By applying the method based on the effective fluid energy momentum
tensor com... | [
{
"created": "Sun, 20 Jan 2013 09:28:18 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Houndjo",
"M. J. S.",
""
],
[
"Rodrigues",
"M. E.",
""
],
[
"Momeni",
"D.",
""
],
[
"Myrzakulov",
"R.",
""
]
] | We present cylindrically symmetric solutions for a type of the Gauss-Bonnet gravity, in details. We derive the full system of the field equations and show that there exist seven families of exact solutions for three forms of viable models. By applying the method based on the effective fluid energy momentum tensor compo... |
1501.05682 | Eduardo Martin-Martinez | Ana Blasco, Luis J. Garay, Mercedes Martin-Benito and Eduardo
Martin-Martinez | The Quantum Echo of the Early Universe | 3 pages. 2 Figures. Proceedings Theory Canada 9. Published in
Canadian Journal of Physics.
(http://www.nrcresearchpress.com/doi/abs/10.1139/cjp-2014-0567) | Canadian Journal of Physics, 93, 968-970 (2015) | 10.1139/cjp-2014-0567 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the fluctuations of quantum fields as seen by late comoving
observers are significantly influenced by the history of the early Universe,
and therefore they transmit information about the nature of spacetime in
timescales when quantum gravitational effects were non-negligible. We discuss
how this may be o... | [
{
"created": "Thu, 22 Jan 2015 22:53:06 GMT",
"version": "v1"
}
] | 2015-10-13 | [
[
"Blasco",
"Ana",
""
],
[
"Garay",
"Luis J.",
""
],
[
"Martin-Benito",
"Mercedes",
""
],
[
"Martin-Martinez",
"Eduardo",
""
]
] | We show that the fluctuations of quantum fields as seen by late comoving observers are significantly influenced by the history of the early Universe, and therefore they transmit information about the nature of spacetime in timescales when quantum gravitational effects were non-negligible. We discuss how this may be obs... |
1606.04246 | Frederic H. Vincent | F. H. Vincent, E. Gourgoulhon, C. Herdeiro and E. Radu | Astrophysical imaging of Kerr black holes with scalar hair | 17 pages, 8 figures, accepted in PRD | Phys. Rev. D 94, 084045 (2016) | 10.1103/PhysRevD.94.084045 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We address the astrophysical imaging of a family of deformed Kerr black holes
(BHs). These are stationary, asymptotically flat black hole (BH) spacetimes,
that are solutions of General Relativity minimally coupled to a massive,
complex scalar field: Kerr BHs with scalar hair (KBHsSH). Such BHs bifurcate
from the vacu... | [
{
"created": "Tue, 14 Jun 2016 08:33:08 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Oct 2016 12:21:43 GMT",
"version": "v2"
}
] | 2016-11-02 | [
[
"Vincent",
"F. H.",
""
],
[
"Gourgoulhon",
"E.",
""
],
[
"Herdeiro",
"C.",
""
],
[
"Radu",
"E.",
""
]
] | We address the astrophysical imaging of a family of deformed Kerr black holes (BHs). These are stationary, asymptotically flat black hole (BH) spacetimes, that are solutions of General Relativity minimally coupled to a massive, complex scalar field: Kerr BHs with scalar hair (KBHsSH). Such BHs bifurcate from the vacuum... |
2207.00374 | Simone Mastrogiovanni | Simone Mastrogiovanni, Astrid Lamberts, Rahul Srinivasan, Tristan
Bruel, Nelson Christensen | Inferring binary black holes stellar progenitors with gravitational wave
sources | 13 pages, 12 figures, submitted to MNRAS | null | 10.1093/mnras/stac2850 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | With its last observing run, the LIGO, Virgo, and KAGRA collaboration has
detected almost one hundred gravitational waves from compact binary
coalescences. A common approach to studying the population properties of the
observed binaries is to use phenomenological models to describe the spin, mass,
and redshift distri... | [
{
"created": "Fri, 1 Jul 2022 12:21:24 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Jul 2022 06:35:41 GMT",
"version": "v2"
}
] | 2022-10-12 | [
[
"Mastrogiovanni",
"Simone",
""
],
[
"Lamberts",
"Astrid",
""
],
[
"Srinivasan",
"Rahul",
""
],
[
"Bruel",
"Tristan",
""
],
[
"Christensen",
"Nelson",
""
]
] | With its last observing run, the LIGO, Virgo, and KAGRA collaboration has detected almost one hundred gravitational waves from compact binary coalescences. A common approach to studying the population properties of the observed binaries is to use phenomenological models to describe the spin, mass, and redshift distribu... |
1106.2966 | Hongsheng Zhang | Hongsheng Zhang, Xin-Zhou Li | MOND cosmology from entropic force | 4 pages, several references added, to appear in PLB | null | 10.1016/j.physletb.2012.07.014 | null | gr-qc astro-ph.CO hep-ph hep-th | http://creativecommons.org/licenses/by-nc-sa/3.0/ | We derive the MOND cosmology which is uniquely corresponding to the original
MOND at galaxy scales via entropic gravity method.
It inherits the key merit of MOND, that is, it reduces the baryonic matter
and non-baryonic dark matter into baryonic matter only.
For the first time we obtain the critical parameter in ... | [
{
"created": "Wed, 15 Jun 2011 13:13:33 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Jul 2012 03:02:21 GMT",
"version": "v2"
}
] | 2012-07-12 | [
[
"Zhang",
"Hongsheng",
""
],
[
"Li",
"Xin-Zhou",
""
]
] | We derive the MOND cosmology which is uniquely corresponding to the original MOND at galaxy scales via entropic gravity method. It inherits the key merit of MOND, that is, it reduces the baryonic matter and non-baryonic dark matter into baryonic matter only. For the first time we obtain the critical parameter in MOND, ... |
2207.02881 | Pietropaolo Frisoni | Pietropaolo Frisoni, Francesco Gozzini, Francesca Vidotto | Markov Chain Monte Carlo methods for graph refinement in Spinfoam
Cosmology | 34 pages, 18 figures | null | 10.1088/1361-6382/acc5d6 | null | gr-qc physics.comp-ph | http://creativecommons.org/licenses/by/4.0/ | We study the behaviour of the Lorentzian Engle-Pereira-Rovelli-Livine
spinfoam amplitude with homogeneous boundary data, under a graph refinement
going from five to twenty boundary tetrahedra. This can be interpreted as a
wave function of the universe, for which we compute boundary geometrical
operators, correlation ... | [
{
"created": "Wed, 6 Jul 2022 18:00:12 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Oct 2022 00:22:58 GMT",
"version": "v2"
}
] | 2023-03-22 | [
[
"Frisoni",
"Pietropaolo",
""
],
[
"Gozzini",
"Francesco",
""
],
[
"Vidotto",
"Francesca",
""
]
] | We study the behaviour of the Lorentzian Engle-Pereira-Rovelli-Livine spinfoam amplitude with homogeneous boundary data, under a graph refinement going from five to twenty boundary tetrahedra. This can be interpreted as a wave function of the universe, for which we compute boundary geometrical operators, correlation fu... |
2103.15523 | Titus K Mathew | Sarath N and Titus K. Mathew | Decaying vacuum and evolution from early inflation to late acceleration | 15 pages, 1 figure | null | null | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | Decaying vacuum models are a class of models that incorporate the vacuum
energy density as a time-evolving entity that has the potential to explain the
entire evolutionary history of the universe in a single framework. A general
solution to the Friedmann equation can be obtained by considering vacuum energy
density a... | [
{
"created": "Mon, 29 Mar 2021 11:46:01 GMT",
"version": "v1"
}
] | 2021-03-30 | [
[
"N",
"Sarath",
""
],
[
"Mathew",
"Titus K.",
""
]
] | Decaying vacuum models are a class of models that incorporate the vacuum energy density as a time-evolving entity that has the potential to explain the entire evolutionary history of the universe in a single framework. A general solution to the Friedmann equation can be obtained by considering vacuum energy density as ... |
1711.08564 | Carlos A. S. Almeida | J. E. G. Silva, W. H. P. Brandao, R. V. Maluf, C. A. S. Almeida | Regular string-like braneworlds | 14 pages, 12 figures. Some modifications to match the published
version in EPJC | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we propose a new class of smooth thick string-like braneworld
in six dimensions. The brane exhibits a varying brane-tension and an $AdS$
asymptotic behavior. The brane-core geometry is parametrized by the Bulk
cosmological constant, the brane width and by a geometrical deformation
parameter. The source ... | [
{
"created": "Thu, 23 Nov 2017 03:19:10 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Jan 2019 02:53:03 GMT",
"version": "v2"
}
] | 2019-01-15 | [
[
"Silva",
"J. E. G.",
""
],
[
"Brandao",
"W. H. P.",
""
],
[
"Maluf",
"R. V.",
""
],
[
"Almeida",
"C. A. S.",
""
]
] | In this work, we propose a new class of smooth thick string-like braneworld in six dimensions. The brane exhibits a varying brane-tension and an $AdS$ asymptotic behavior. The brane-core geometry is parametrized by the Bulk cosmological constant, the brane width and by a geometrical deformation parameter. The source sa... |
2107.01298 | Niels Warburton | Niels Warburton, Adam Pound, Barry Wardell, Jeremy Miller, Leanne
Durkan | Gravitational-wave energy flux for compact binaries through second order
in the mass ratio | 5 pages + supplemental material, 7 figures; Updated to reflect
published version | Phys. Rev. Lett. 127, 151102 (2021) | 10.1103/PhysRevLett.127.151102 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the framework of self-force theory, we compute the gravitational-wave
energy flux through second order in the mass ratio for compact binaries in
quasicircular orbits. Our results are consistent with post-Newtonian
calculations in the weak field and they agree remarkably well with
numerical-relativity simulatio... | [
{
"created": "Fri, 2 Jul 2021 23:08:31 GMT",
"version": "v1"
},
{
"created": "Sat, 9 Oct 2021 21:35:14 GMT",
"version": "v2"
}
] | 2021-10-12 | [
[
"Warburton",
"Niels",
""
],
[
"Pound",
"Adam",
""
],
[
"Wardell",
"Barry",
""
],
[
"Miller",
"Jeremy",
""
],
[
"Durkan",
"Leanne",
""
]
] | Within the framework of self-force theory, we compute the gravitational-wave energy flux through second order in the mass ratio for compact binaries in quasicircular orbits. Our results are consistent with post-Newtonian calculations in the weak field and they agree remarkably well with numerical-relativity simulations... |
1010.3079 | Sachie Shiomi | Sachie Shiomi | Geophysical constraint on a relic background of the dilatons | 6 pages, Proceedings for the 8th Edoardo Amaldi Conference on
Gravitational Waves, 21-26 June, 2009, Columbia University, New York, USA | J.Phys.Conf.Ser.228:012048,2010 | 10.1088/1742-6596/228/1/012048 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | According to a scenario in string cosmology, a relic background of light
dilatons can be a significant component of the dark matter in the Universe. A
new approach of searching for such a dilatonic background by observing Earth's
surface gravity was proposed in my previous work. In this paper, the concept of
the geop... | [
{
"created": "Fri, 15 Oct 2010 06:32:48 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Shiomi",
"Sachie",
""
]
] | According to a scenario in string cosmology, a relic background of light dilatons can be a significant component of the dark matter in the Universe. A new approach of searching for such a dilatonic background by observing Earth's surface gravity was proposed in my previous work. In this paper, the concept of the geophy... |
gr-qc/9503043 | Gareth Cheetham | Gareth J. Cheetham, E. J. Copeland | Quantum Dynamics Beyond the Gaussian Approximation | 9 pages, 2 compressed Postscript figures included, requires epsf.tex | Phys.Rev.D53:4125-4128,1996 | 10.1103/PhysRevD.53.4125 | null | gr-qc | null | The time dependent quantum variational principle is emerging as an important
means of studying quantum dynamics, particularly in early universe scenarios.
To date all investigations have worked within a Gaussian framework. Here we
present an improved method which is demonstrated to be superior to the Gaussian
approac... | [
{
"created": "Thu, 23 Mar 1995 14:11:00 GMT",
"version": "v1"
}
] | 2010-01-06 | [
[
"Cheetham",
"Gareth J.",
""
],
[
"Copeland",
"E. J.",
""
]
] | The time dependent quantum variational principle is emerging as an important means of studying quantum dynamics, particularly in early universe scenarios. To date all investigations have worked within a Gaussian framework. Here we present an improved method which is demonstrated to be superior to the Gaussian approach ... |
1611.09227 | Marco Caldarelli | Marco M. Caldarelli | Introduzione alla Cosmologia | 66 pages, 14 figures, in Italian | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Introductory lectures notes on cosmology, aimed at master students in physics
and based on a course held at Milano University (in Italian).
| [
{
"created": "Fri, 25 Nov 2016 14:04:18 GMT",
"version": "v1"
}
] | 2016-11-29 | [
[
"Caldarelli",
"Marco M.",
""
]
] | Introductory lectures notes on cosmology, aimed at master students in physics and based on a course held at Milano University (in Italian). |
2405.10459 | Remo Ruffini | R. Ruffini, C.L. Bianco, M. Prakapenia, H. Quevedo, J.A. Rueda, S.R.
Zhang | The role of the irreducible mass in repetitive Penrose energy extraction
processes in a Kerr black hole | Submitted to PRL. Revised version following Referees' reports | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The concept of the irreducible mass ($M_{\rm irr}$) has led to the
mass-energy ($M$) formula of a Kerr-Newman black hole (BH), in turn leading to
an expression for its surface area $S=16\pi M_{\rm irr}^2$. This allowed as
well the coeval identification of the reversible and irreversible
transformations. The concepts ... | [
{
"created": "Thu, 16 May 2024 22:11:34 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jun 2024 17:34:20 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Jul 2024 09:08:51 GMT",
"version": "v3"
}
] | 2024-07-02 | [
[
"Ruffini",
"R.",
""
],
[
"Bianco",
"C. L.",
""
],
[
"Prakapenia",
"M.",
""
],
[
"Quevedo",
"H.",
""
],
[
"Rueda",
"J. A.",
""
],
[
"Zhang",
"S. R.",
""
]
] | The concept of the irreducible mass ($M_{\rm irr}$) has led to the mass-energy ($M$) formula of a Kerr-Newman black hole (BH), in turn leading to an expression for its surface area $S=16\pi M_{\rm irr}^2$. This allowed as well the coeval identification of the reversible and irreversible transformations. The concepts of... |
2404.11719 | Neil J. Cornish | Toral Gupta and Neil Cornish | Detecting gravitational wave signals using a flexible model for the
amplitude and frequency evolution | 13 pages, 12 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We currently lack good waveform models for many gravitational wave sources.
Examples where models are lacking include neutron star post merger signals,
core collapse supernovae, and signals of unknown origin. Wavelet based
techniques have proven effective at detecting and characterizing these signals.
Here we introdu... | [
{
"created": "Wed, 17 Apr 2024 20:12:45 GMT",
"version": "v1"
}
] | 2024-04-19 | [
[
"Gupta",
"Toral",
""
],
[
"Cornish",
"Neil",
""
]
] | We currently lack good waveform models for many gravitational wave sources. Examples where models are lacking include neutron star post merger signals, core collapse supernovae, and signals of unknown origin. Wavelet based techniques have proven effective at detecting and characterizing these signals. Here we introduce... |
gr-qc/9708036 | George Lavrelashvili | P. Breitenlohner, G. Lavrelashvili, and D. Maison | Non-Abelian black holes: The inside story | 23 pages, latex, contains 12 eps files combined in 8 figures | null | null | BUTP-97/23 | gr-qc | null | Recent progress in understanding of the internal structure of non-Abelian
black holes is discussed.
Talk given at the international Workshop on The Internal Structure of Black
Holes and Spacetime Singularities, Haifa, Israel, June 29 -- July 3, 1997.
| [
{
"created": "Sun, 17 Aug 1997 15:55:05 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Breitenlohner",
"P.",
""
],
[
"Lavrelashvili",
"G.",
""
],
[
"Maison",
"D.",
""
]
] | Recent progress in understanding of the internal structure of non-Abelian black holes is discussed. Talk given at the international Workshop on The Internal Structure of Black Holes and Spacetime Singularities, Haifa, Israel, June 29 -- July 3, 1997. |
1101.3151 | Shahar Hod | Shahar Hod | Quantum buoyancy, generalized second law, and higher-dimensional entropy
bounds | 6 pages | JHEP 1012:033,2010 | 10.1007/JHEP12(2010)033 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Bekenstein has presented evidence for the existence of a universal upper
bound of magnitude $2\pi R/\hbar c$ to the entropy-to-energy ratio $S/E$ of an
arbitrary {\it three} dimensional system of proper radius $R$ and negligible
self-gravity. In this paper we derive a generalized upper bound on the
entropy-to-energy ... | [
{
"created": "Mon, 17 Jan 2011 08:51:59 GMT",
"version": "v1"
}
] | 2011-03-02 | [
[
"Hod",
"Shahar",
""
]
] | Bekenstein has presented evidence for the existence of a universal upper bound of magnitude $2\pi R/\hbar c$ to the entropy-to-energy ratio $S/E$ of an arbitrary {\it three} dimensional system of proper radius $R$ and negligible self-gravity. In this paper we derive a generalized upper bound on the entropy-to-energy ra... |
1403.4356 | Dibakar Roychowdhury | Dibakar Roychowdhury | Phase transition in black holes | Ph.D. thesis (arXiv version). 132 pages, including the front matter.
Thesis Supervisor: Prof. Rabin Banerjee. Institution: S.N. Bose National
Centre for Basic Sciences, Kolkata, India. Degree awarded on 07 th January
2014 from University of Calcutta, Kolkata, India. arXiv admin note: text
overlap with arXiv:131... | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present thesis is devoted towards the study of various aspects of the
phase transition phenomena occurring in black holes defined in an
Anti-de-Sitter (AdS) space. Based on the fundamental principles of
thermodynamics and considering a grand canonical framework we examine various
aspects of the phase transition p... | [
{
"created": "Tue, 18 Mar 2014 06:31:12 GMT",
"version": "v1"
}
] | 2014-03-19 | [
[
"Roychowdhury",
"Dibakar",
""
]
] | The present thesis is devoted towards the study of various aspects of the phase transition phenomena occurring in black holes defined in an Anti-de-Sitter (AdS) space. Based on the fundamental principles of thermodynamics and considering a grand canonical framework we examine various aspects of the phase transition phe... |
gr-qc/0504053 | Lorenzo Iorio | Lorenzo Iorio | On the effects of the Dvali-Gabadadze-Porrati braneworld gravity on the
orbital motion of a test particle | LaTex2e, 23 pages, 5 tables, 1 figure, 37 references. Second-order
corrections in eccentricity explicitly added. Typos corrected. References
updated | Class.Quant.Grav. 22 (2005) 5271-5281 | 10.1088/0264-9381/22/24/005 | null | gr-qc astro-ph hep-ph | null | In this paper we explicitly work out the secular perturbations induced on all
the Keplerian orbital elements of a test body to order O(e^2) in the
eccentricity e by the weak-field long-range modifications of the usual
Newton-Einstein gravity due to the Dvali-Gabadadze-Porrati (DGP) braneworld
model. The Gauss perturb... | [
{
"created": "Tue, 12 Apr 2005 21:52:12 GMT",
"version": "v1"
},
{
"created": "Tue, 24 May 2005 16:56:47 GMT",
"version": "v2"
},
{
"created": "Wed, 25 May 2005 13:43:54 GMT",
"version": "v3"
},
{
"created": "Sat, 20 Aug 2005 19:17:32 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"Iorio",
"Lorenzo",
""
]
] | In this paper we explicitly work out the secular perturbations induced on all the Keplerian orbital elements of a test body to order O(e^2) in the eccentricity e by the weak-field long-range modifications of the usual Newton-Einstein gravity due to the Dvali-Gabadadze-Porrati (DGP) braneworld model. The Gauss perturbat... |
1307.1916 | Edward Anderson | Edward Anderson | Minisuperspace model of Machian Resolution of Problem of Time. I.
Isotropic Case | 13 pages. One new figure, various new references, typos removed, a
number of comments added | Gen. Rel. Grav 46 (2014) 1708 | 10.1007/s10714-014-1708-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A local resolution to the Problem of Time that is Machian and was previously
demonstrated for various relational mechanics models is here shown to work for
a more widely studied quantum cosmological model. Namely, closed isotropic
minisuperspace GR with minimally-coupled scalar field matter. This uses work
firstly al... | [
{
"created": "Sun, 7 Jul 2013 21:08:56 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Aug 2013 17:25:05 GMT",
"version": "v2"
},
{
"created": "Sat, 22 Feb 2014 18:20:38 GMT",
"version": "v3"
}
] | 2015-06-16 | [
[
"Anderson",
"Edward",
""
]
] | A local resolution to the Problem of Time that is Machian and was previously demonstrated for various relational mechanics models is here shown to work for a more widely studied quantum cosmological model. Namely, closed isotropic minisuperspace GR with minimally-coupled scalar field matter. This uses work firstly alon... |
gr-qc/0502017 | Ken-Ichi Nakao | Ken-ichi Nakao, Yoshiyuki Morisawa | Gravitational Radiation from Cylindrical Naked Singularity | 20 pages, 1 figure | Phys.Rev. D71 (2005) 124007 | 10.1103/PhysRevD.71.124007 | OCU-PHYS-224, AP-GR-22, YITP-05-4 | gr-qc | null | We construct an approximate solution which describes the gravitational
emission from a naked singularity formed by the gravitational collapse of a
cylindrical thick shell composed of dust. The assumed situation is that the
collapsing speed of the dust is very large. In this situation, the metric
variables are obtaine... | [
{
"created": "Fri, 4 Feb 2005 08:16:31 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Nakao",
"Ken-ichi",
""
],
[
"Morisawa",
"Yoshiyuki",
""
]
] | We construct an approximate solution which describes the gravitational emission from a naked singularity formed by the gravitational collapse of a cylindrical thick shell composed of dust. The assumed situation is that the collapsing speed of the dust is very large. In this situation, the metric variables are obtained ... |
1204.1525 | Shih-Yuin Lin | Shih-Yuin Lin, Kazutomu Shiokawa, Chung-Hsien Chou, and B. L. Hu | Quantum teleportation between moving detectors in a quantum field | 18 pages, 7 figures | Phys. Rev. D 91, 084063 (2015) | 10.1103/PhysRevD.91.084063 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the quantum teleportation of continuous variables modeled by
Unruh-DeWitt detectors coupled to a common quantum field initially in the
Minkowski vacuum. An unknown coherent state of an Unruh-DeWitt detector is
teleported from one inertial agent (Alice) to an almost uniformly accelerated
agent (Rob, for re... | [
{
"created": "Fri, 6 Apr 2012 18:10:27 GMT",
"version": "v1"
}
] | 2015-05-27 | [
[
"Lin",
"Shih-Yuin",
""
],
[
"Shiokawa",
"Kazutomu",
""
],
[
"Chou",
"Chung-Hsien",
""
],
[
"Hu",
"B. L.",
""
]
] | We consider the quantum teleportation of continuous variables modeled by Unruh-DeWitt detectors coupled to a common quantum field initially in the Minkowski vacuum. An unknown coherent state of an Unruh-DeWitt detector is teleported from one inertial agent (Alice) to an almost uniformly accelerated agent (Rob, for rela... |
1606.04894 | Alexander Tolish | Alexander Tolish and Robert M. Wald | The Cosmological Memory Effect | 22 pages, 1 figure. Eqs (53)-(55) have been corrected | Phys. Rev. D 94, 044009 (2016) | 10.1103/PhysRevD.94.044009 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The "memory effect" is the permanent change in the relative separation of
test particles resulting from the passage of gravitational radiation. We
investigate the memory effect for a general, spatially flat FLRW cosmology by
considering the radiation associated with emission events involving
particle-like sources. We... | [
{
"created": "Wed, 15 Jun 2016 18:25:36 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Jun 2016 17:15:54 GMT",
"version": "v2"
}
] | 2016-08-17 | [
[
"Tolish",
"Alexander",
""
],
[
"Wald",
"Robert M.",
""
]
] | The "memory effect" is the permanent change in the relative separation of test particles resulting from the passage of gravitational radiation. We investigate the memory effect for a general, spatially flat FLRW cosmology by considering the radiation associated with emission events involving particle-like sources. We f... |
1508.02372 | Karl Wette | Karl Wette | Parameter-space metric for all-sky semicoherent searches for
gravitational-wave pulsars | 21 pages, 13 figures, 2 tables | Phys. Rev. D 92, 082003 (2015) | 10.1103/PhysRevD.92.082003 | LIGO-P1500126 | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The sensitivity of all-sky searches for gravitational-wave pulsars is
primarily limited by the finite availability of computing resources.
Semicoherent searches are a widely-used method of maximizing sensitivity to
gravitational-wave pulsars at fixed computing cost: the data from a
gravitational-wave detector are par... | [
{
"created": "Mon, 10 Aug 2015 19:41:08 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Sep 2015 18:37:50 GMT",
"version": "v2"
},
{
"created": "Wed, 28 Oct 2015 16:51:29 GMT",
"version": "v3"
}
] | 2015-10-29 | [
[
"Wette",
"Karl",
""
]
] | The sensitivity of all-sky searches for gravitational-wave pulsars is primarily limited by the finite availability of computing resources. Semicoherent searches are a widely-used method of maximizing sensitivity to gravitational-wave pulsars at fixed computing cost: the data from a gravitational-wave detector are parti... |
gr-qc/0310052 | Gregor Schaefer | Gregor Schaefer | Isocurvature Perturbations in Quintessence Cosmologies | Talk given at the Blois '03 Conference on Cosmology | null | null | null | gr-qc | null | We present a systematic treatment of the initial conditions and evolution of
cosmological perturbations in a universe containing photons, baryons,
neutrinos, cold dark matter, and a scalar quintessence field. By formulating
the evolution in terms of a differential equation involving a matrix acting on
a vector compri... | [
{
"created": "Thu, 9 Oct 2003 14:31:16 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Schaefer",
"Gregor",
""
]
] | We present a systematic treatment of the initial conditions and evolution of cosmological perturbations in a universe containing photons, baryons, neutrinos, cold dark matter, and a scalar quintessence field. By formulating the evolution in terms of a differential equation involving a matrix acting on a vector comprise... |
1307.5527 | David Sloan | David Sloan | Loop Quantum Cosmology and the Fine Structure Constant | 10 pages, 5 figures | Class. Quant. Grav. 31 (2013) 025014 | 10.1088/0264-9381/31/2/025014 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The cosmological implications of introducing a variation to the fine
structure `constant', \alpha are examined within the context of Loop Quantum
Cosmology. The evolution of \alpha is described using the model introduced by
Bekenstein, Sandvik, Barrow and Magueijo, in which a ghost scalar field
produces the variation... | [
{
"created": "Sun, 21 Jul 2013 13:45:24 GMT",
"version": "v1"
}
] | 2016-04-29 | [
[
"Sloan",
"David",
""
]
] | The cosmological implications of introducing a variation to the fine structure `constant', \alpha are examined within the context of Loop Quantum Cosmology. The evolution of \alpha is described using the model introduced by Bekenstein, Sandvik, Barrow and Magueijo, in which a ghost scalar field produces the variation. ... |
0709.2365 | Golam Mortuza Hossain | Martin Bojowald and Golam Mortuza Hossain | Loop quantum gravity corrections to gravitational wave dispersion | 27 pages | Phys.Rev.D77:023508,2008 | 10.1103/PhysRevD.77.023508 | IGC-07/9-1 | gr-qc astro-ph hep-th | null | Cosmological tensor perturbations equations are derived for Hamiltonian
cosmology based on Ashtekar's formulation of general relativity, including
typical quantum gravity effects in the Hamiltonian constraint as they are
expected from loop quantum gravity. This translates to corrections of the
dispersion relation for... | [
{
"created": "Fri, 14 Sep 2007 19:46:23 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bojowald",
"Martin",
""
],
[
"Hossain",
"Golam Mortuza",
""
]
] | Cosmological tensor perturbations equations are derived for Hamiltonian cosmology based on Ashtekar's formulation of general relativity, including typical quantum gravity effects in the Hamiltonian constraint as they are expected from loop quantum gravity. This translates to corrections of the dispersion relation for g... |
2210.01718 | Chinthak Murali | Chinthak Murali and David Lumley | Detecting and Denoising Gravitational Wave Signals from Binary Black
Holes using Deep Learning | 15 pages, 11 figures | null | null | null | gr-qc astro-ph.IM | http://creativecommons.org/licenses/by/4.0/ | We present a convolutional neural network, designed in the auto-encoder
configuration that can detect and denoise astrophysical gravitational waves
from merging black hole binaries, orders of magnitude faster than the
conventional matched-filtering based detection that is currently employed at
advanced LIGO (aLIGO). ... | [
{
"created": "Tue, 4 Oct 2022 16:18:50 GMT",
"version": "v1"
}
] | 2022-10-05 | [
[
"Murali",
"Chinthak",
""
],
[
"Lumley",
"David",
""
]
] | We present a convolutional neural network, designed in the auto-encoder configuration that can detect and denoise astrophysical gravitational waves from merging black hole binaries, orders of magnitude faster than the conventional matched-filtering based detection that is currently employed at advanced LIGO (aLIGO). Th... |
1712.04041 | Krzysztof Bolejko | Krzysztof Bolejko | Gravitational entropy and the cosmological no-hair conjecture | 20 pages, 3 figures; v2: minor corrections, accepted for publication | Phys. Rev. D 97, 083515 (2018) | 10.1103/PhysRevD.97.083515 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitational entropy and no-hair conjectures seems to predict
contradictory future states of our Universe. The growth of the gravitational
entropy is associated with the growth of inhomogeneity, while the no-hair
conjecture argues that a universe dominated by dark energy should
asymptotically approach a homogene... | [
{
"created": "Mon, 11 Dec 2017 21:38:10 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Apr 2018 00:53:39 GMT",
"version": "v2"
}
] | 2018-04-27 | [
[
"Bolejko",
"Krzysztof",
""
]
] | The gravitational entropy and no-hair conjectures seems to predict contradictory future states of our Universe. The growth of the gravitational entropy is associated with the growth of inhomogeneity, while the no-hair conjecture argues that a universe dominated by dark energy should asymptotically approach a homogeneou... |
2401.10680 | Alexandros Kehagias | Alex Kehagias and Antonio Riotto | The PTA Hellings and Downs Correlation Unmasked by Symmetries | 22 pages, 2 figures | null | null | null | gr-qc astro-ph.CO hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | The Hellings and Downs correlation curve describes the correlation of the
timing residuals from pairs of pulsars as a function of their angular
separation on the sky and is a smoking-gun signature for the detection of an
isotropic stochastic background of gravitational waves. We show that it can be
easily obtained fr... | [
{
"created": "Fri, 19 Jan 2024 13:24:33 GMT",
"version": "v1"
}
] | 2024-01-22 | [
[
"Kehagias",
"Alex",
""
],
[
"Riotto",
"Antonio",
""
]
] | The Hellings and Downs correlation curve describes the correlation of the timing residuals from pairs of pulsars as a function of their angular separation on the sky and is a smoking-gun signature for the detection of an isotropic stochastic background of gravitational waves. We show that it can be easily obtained from... |
2010.04738 | Baofei Li | Lucia Gordon, Bao-Fei Li and Parampreet Singh | Quantum gravitational onset of Starobinsky inflation in a closed
universe | 25 pages, 10 figures | Phys. Rev. D 103, 046016 (2021) | 10.1103/PhysRevD.103.046016 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent cosmic microwave background observations favor low energy scale
inflationary models in a closed universe. However, onset of inflation in such
models for a closed universe is known to be severely problematic. In
particular, such a universe recollapses within a few Planck seconds and
encounters a big crunch sing... | [
{
"created": "Fri, 9 Oct 2020 18:00:10 GMT",
"version": "v1"
}
] | 2021-03-03 | [
[
"Gordon",
"Lucia",
""
],
[
"Li",
"Bao-Fei",
""
],
[
"Singh",
"Parampreet",
""
]
] | Recent cosmic microwave background observations favor low energy scale inflationary models in a closed universe. However, onset of inflation in such models for a closed universe is known to be severely problematic. In particular, such a universe recollapses within a few Planck seconds and encounters a big crunch singul... |
1709.04258 | Sergey Pavluchenko A. | Sergey A. Pavluchenko and Alexey Toporensky | Effects of spatial curvature and anisotropy on the asymptotic regimes in
Einstein-Gauss-Bonnet gravity | 22 pages, 3 figures | Eur. Phys. J. C 78, 373 (2018) | 10.1140/epjc/s10052-018-5855-4 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we address two important issues which could affect reaching the
exponential and Kasner asymptotes in Einstein-Gauss-Bonnet cosmologies --
spatial curvature and anisotropy in both three- and extra-dimensional
subspaces. In the first part of the paper we consider cosmological evolution of
spaces being the... | [
{
"created": "Wed, 13 Sep 2017 11:27:23 GMT",
"version": "v1"
}
] | 2018-05-16 | [
[
"Pavluchenko",
"Sergey A.",
""
],
[
"Toporensky",
"Alexey",
""
]
] | In this paper we address two important issues which could affect reaching the exponential and Kasner asymptotes in Einstein-Gauss-Bonnet cosmologies -- spatial curvature and anisotropy in both three- and extra-dimensional subspaces. In the first part of the paper we consider cosmological evolution of spaces being the p... |
2312.08225 | Pramit Rej | Akashdip Karmakar and Pramit Rej | Celestial attributes of Hybrid star in $5\mathcal{D}$
Einstein-Gauss-Bonnet gravity | 23 pages, 12 figures, 4 tables, Final version published on 12.12.2023 | Chinese Journal of Physics, Volume 87, February 2024, Pages
155-173 | 10.1016/j.cjph.2023.11.031 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hybrid star is the term given to a neutron star with a quark core. Due to a
lot of uncertainties in the calculations and compositions of such a
high-density system, it is of great interest and a preferred scenario for
particle physicists and astrophysicists. To explore some novel aspects within
the framework of the $... | [
{
"created": "Wed, 13 Dec 2023 15:47:03 GMT",
"version": "v1"
}
] | 2023-12-14 | [
[
"Karmakar",
"Akashdip",
""
],
[
"Rej",
"Pramit",
""
]
] | Hybrid star is the term given to a neutron star with a quark core. Due to a lot of uncertainties in the calculations and compositions of such a high-density system, it is of great interest and a preferred scenario for particle physicists and astrophysicists. To explore some novel aspects within the framework of the $5\... |
gr-qc/0603113 | Guihua Tian | Tian Gui-hua, Shi-kun Wang, Shuquan Zhong | The effect of the tortoise coordinate on the stable study of the
Schwarzschild black hole | 5pages, no figure | null | null | null | gr-qc | null | Carefully analyze influence of the tortoise coordinates r* and t on the
stable study of the Schwarzschild black hole. Actually, one should be cautious
in using the compact property of the perturbation field: it is true only with
respect with the coordinate r and proper time or "good time", not the tortoise
coordinate... | [
{
"created": "Wed, 29 Mar 2006 01:06:08 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gui-hua",
"Tian",
""
],
[
"Wang",
"Shi-kun",
""
],
[
"Zhong",
"Shuquan",
""
]
] | Carefully analyze influence of the tortoise coordinates r* and t on the stable study of the Schwarzschild black hole. Actually, one should be cautious in using the compact property of the perturbation field: it is true only with respect with the coordinate r and proper time or "good time", not the tortoise coordinates ... |
1809.10279 | Artyom Yurov | Artyom Yurov, Valerian Yurov | A look at the generalized Darboux transformations for the quasinormal
spectra in Schwarzschild black hole perturbation theory: just how general
should it be? | 11 pages, new title, expanded the content, added new references,
corrected the typos | Phys. Lett. A, 383, 2571-2578 (2019) | 10.1016/j.physleta.2019.05.024 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we take a close look at three types of transformations usable
in the Schwarzschild black hole perturbation theory: a standard (DT), a binary
(BDT) and a generalized (GDT) Darboux transformations. In particular, we
discuss the absolutely crucial property of {\em isospectrality} of the
aforementioned tr... | [
{
"created": "Thu, 27 Sep 2018 00:31:20 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Dec 2018 02:09:17 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Jul 2019 16:48:19 GMT",
"version": "v3"
}
] | 2019-07-26 | [
[
"Yurov",
"Artyom",
""
],
[
"Yurov",
"Valerian",
""
]
] | In this article we take a close look at three types of transformations usable in the Schwarzschild black hole perturbation theory: a standard (DT), a binary (BDT) and a generalized (GDT) Darboux transformations. In particular, we discuss the absolutely crucial property of {\em isospectrality} of the aforementioned tran... |
gr-qc/9807016 | Luz Maria Diaz-Rivera | Luis O. Pimentel and L. M. Diaz-Rivera | Coasting cosmologies with time dependent cosmological constant | 7 pages, latex file (ijmpal macro), accepted for publication in Int.
Mod. Phys. A | Int.J.Mod.Phys. A14 (1999) 1523-1530 | 10.1142/S0217751X99000762 | null | gr-qc | null | The effect of a time dependent cosmological constant is considered in a
family of scalar tensor theories. Friedmann-Robertson-Walker cosmological
models for vacumm and perfect fluid matter are found. They have a linear
expansion factor, the so called coasting cosmology, the gravitational
"constant" decreace inversely... | [
{
"created": "Tue, 7 Jul 1998 21:58:19 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Pimentel",
"Luis O.",
""
],
[
"Diaz-Rivera",
"L. M.",
""
]
] | The effect of a time dependent cosmological constant is considered in a family of scalar tensor theories. Friedmann-Robertson-Walker cosmological models for vacumm and perfect fluid matter are found. They have a linear expansion factor, the so called coasting cosmology, the gravitational "constant" decreace inversely w... |
gr-qc/0312035 | C\'esar Augusto Costa | C\'esar A. Costa, Odylio D. Aguiar and Nadja S. Magalh\~aes | The Mario Schenberg Gravitational Wave Detector: A mathematical model
for its quadrupolar oscilations | 11 pages, 14 figures, submitted to PRD | null | null | null | gr-qc | null | In this work we present a mathematical model for the mechanical response of
the Brazilian Mario SCHENBERG gravitational wave (GW) detector to such waves.
We found the physical parameters that are involved in this response assuming a
linear elastic theory. Adopting this approach we determined the system's
resonance fr... | [
{
"created": "Fri, 5 Dec 2003 15:45:35 GMT",
"version": "v1"
}
] | 2016-08-16 | [
[
"Costa",
"César A.",
""
],
[
"Aguiar",
"Odylio D.",
""
],
[
"Magalhães",
"Nadja S.",
""
]
] | In this work we present a mathematical model for the mechanical response of the Brazilian Mario SCHENBERG gravitational wave (GW) detector to such waves. We found the physical parameters that are involved in this response assuming a linear elastic theory. Adopting this approach we determined the system's resonance freq... |
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