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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/0509104 | Alejandro Cabo | Alejandro Cabo, Alejandro Garcia-Chung and Alejandro Rosabal | Can the cosmological constant undergo abrupt changes? | 10 pages, 1 figure | null | null | CERN-PH-TH/2005-178 | gr-qc | null | The existence of a simple spherically symmetric and static solution of the
Einstein equations in the presence of a cosmological constant vanishing outside
a definite value of the radial distance is investigated. A particular
succession of field configurations, which are solutions of the Einstein
equations in the pres... | [
{
"created": "Tue, 27 Sep 2005 10:33:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Cabo",
"Alejandro",
""
],
[
"Garcia-Chung",
"Alejandro",
""
],
[
"Rosabal",
"Alejandro",
""
]
] | The existence of a simple spherically symmetric and static solution of the Einstein equations in the presence of a cosmological constant vanishing outside a definite value of the radial distance is investigated. A particular succession of field configurations, which are solutions of the Einstein equations in the presen... |
gr-qc/0611031 | Dr. Anirudh Pradhan | Anirudh Pradhan, Kanti Jotania and Anju Rai | Generation of Bianchi Type V Bulk Viscous Cosmological Models with Time
Dependent $\Lambda$-Term | 22 pages, 3 figures, Some typos corrected | FizikaB15:163-182,2006 | null | null | gr-qc | null | Bianchi type V bulk viscous fluid cosmological models are investigated with
dynamic cosmological term $\Lambda(t)$. Using a generation technique (Camci
{\it et al.}, 2001), it is shown that the Einstein's field equations are
solvable for any arbitrary cosmic scale function. Solutions for particular
forms of cosmic sc... | [
{
"created": "Sun, 5 Nov 2006 12:14:55 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Dec 2006 06:35:11 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Pradhan",
"Anirudh",
""
],
[
"Jotania",
"Kanti",
""
],
[
"Rai",
"Anju",
""
]
] | Bianchi type V bulk viscous fluid cosmological models are investigated with dynamic cosmological term $\Lambda(t)$. Using a generation technique (Camci {\it et al.}, 2001), it is shown that the Einstein's field equations are solvable for any arbitrary cosmic scale function. Solutions for particular forms of cosmic scal... |
2005.06052 | Crist\'obal Corral | Crist\'obal Corral, Norman Cruz, Esteban Gonz\'alez | Diffusion in unimodular gravity: Analytical solutions, late-time
acceleration, and cosmological constraints | v1. 14 pages, 10 figures; v2. Typos corrected, references added, and
more explanations provided. Accepted for publication in Phys. Rev. D | Phys. Rev. D 102, 023508 (2020) | 10.1103/PhysRevD.102.023508 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Unimodular gravity is an appealing approach to address the cosmological
constant problem. In this scenario, the vacuum energy density of quantum fields
does not gravitate and the cosmological constant appears merely as an
integration constant. Recently, it has been shown that energy diffusion that
may arise in quantu... | [
{
"created": "Tue, 12 May 2020 21:04:20 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jun 2020 21:36:18 GMT",
"version": "v2"
}
] | 2020-07-03 | [
[
"Corral",
"Cristóbal",
""
],
[
"Cruz",
"Norman",
""
],
[
"González",
"Esteban",
""
]
] | Unimodular gravity is an appealing approach to address the cosmological constant problem. In this scenario, the vacuum energy density of quantum fields does not gravitate and the cosmological constant appears merely as an integration constant. Recently, it has been shown that energy diffusion that may arise in quantum ... |
gr-qc/0606107 | H Mohseni Sadjadi | H. Mohseni Sadjadi | The effect of geometry on charge confinement in three dimensions | 8 pages. To be published in Europhysics Letters | Europhys.Lett.75:371-377,2006 | 10.1209/epl/i2006-10128-3 | null | gr-qc hep-th | null | We show that, in contrast to the flat case, the Maxwell theory is not
confining in the background of the three dimensional BTZ black-hole (covering
space). We also study the effect of the curvature on screening behavior of
Maxwell-Chern-Simons model in this space-time.
| [
{
"created": "Sat, 24 Jun 2006 12:51:51 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Sadjadi",
"H. Mohseni",
""
]
] | We show that, in contrast to the flat case, the Maxwell theory is not confining in the background of the three dimensional BTZ black-hole (covering space). We also study the effect of the curvature on screening behavior of Maxwell-Chern-Simons model in this space-time. |
1909.08620 | Ian Jubb | Christopher Barton, Andrew Counsell, Fay Dowker, Dewi S. W. Gould, Ian
Jubb, Gwylim Taylor | Horizon Molecules in Causal Set Theory | null | Phys. Rev. D 100, 126008 (2019) | 10.1103/PhysRevD.100.126008 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new definition of "horizon molecules" in Causal Set Theory
following pioneering work by Dou and Sorkin. The new concept applies for any
causal horizon and its intersection with any spacelike hypersurface. In the
continuum limit, as the discreteness scale tends to zero, the leading behaviour
of the expect... | [
{
"created": "Wed, 18 Sep 2019 18:00:00 GMT",
"version": "v1"
}
] | 2019-12-11 | [
[
"Barton",
"Christopher",
""
],
[
"Counsell",
"Andrew",
""
],
[
"Dowker",
"Fay",
""
],
[
"Gould",
"Dewi S. W.",
""
],
[
"Jubb",
"Ian",
""
],
[
"Taylor",
"Gwylim",
""
]
] | We propose a new definition of "horizon molecules" in Causal Set Theory following pioneering work by Dou and Sorkin. The new concept applies for any causal horizon and its intersection with any spacelike hypersurface. In the continuum limit, as the discreteness scale tends to zero, the leading behaviour of the expected... |
0907.2637 | Christian Reisswig | C. Reisswig, N. T. Bishop, D. Pollney, and B. Szilagyi | Unambiguous determination of gravitational waveforms from binary black
hole mergers | 4 pages, 3 figures, published version | Phys.Rev.Lett.103:221101,2009 | 10.1103/PhysRevLett.103.221101 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational radiation is properly defined only at future null infinity
($\scri$), but in practice it is estimated from data calculated at a finite
radius. We have used characteristic extraction to calculate gravitational
radiation at $\scri$ for the inspiral and merger of two equal mass non-spinning
black holes. Th... | [
{
"created": "Wed, 15 Jul 2009 16:13:00 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Nov 2009 11:57:27 GMT",
"version": "v2"
},
{
"created": "Fri, 8 Jan 2010 10:38:25 GMT",
"version": "v3"
}
] | 2010-01-08 | [
[
"Reisswig",
"C.",
""
],
[
"Bishop",
"N. T.",
""
],
[
"Pollney",
"D.",
""
],
[
"Szilagyi",
"B.",
""
]
] | Gravitational radiation is properly defined only at future null infinity ($\scri$), but in practice it is estimated from data calculated at a finite radius. We have used characteristic extraction to calculate gravitational radiation at $\scri$ for the inspiral and merger of two equal mass non-spinning black holes. Thus... |
1004.5324 | David Campo | David Campo | Problems with models of a fundamental length | null | null | null | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I critically examine various ad hoc models describing a fundamental minimal
length at the level of the propagator. They violate causality and/or unitarity.
| [
{
"created": "Thu, 29 Apr 2010 15:26:53 GMT",
"version": "v1"
}
] | 2015-03-17 | [
[
"Campo",
"David",
""
]
] | I critically examine various ad hoc models describing a fundamental minimal length at the level of the propagator. They violate causality and/or unitarity. |
2305.00711 | Dennis Stock | Dennis Stock, Enea Di Dio, Ruth Durrer | The Hawking Energy in a Perturbed Friedmann-Lema\^{i}tre Universe | matches published version; Mathematica file attached | JCAP08(2023)033 | 10.1088/1475-7516/2023/08/033 | CERN-TH-2023-063 | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Hawking's quasi-local energy definition quantifies the energy enclosed by a
spacelike 2-sphere in terms of the amount of lightbending on the sphere caused
by the energy distribution inside the sphere. This paper establishes for the
first time a direct connection between the formal mathematical definition of a
quasi-l... | [
{
"created": "Mon, 1 May 2023 08:22:33 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Aug 2023 14:06:16 GMT",
"version": "v2"
}
] | 2023-08-16 | [
[
"Stock",
"Dennis",
""
],
[
"Di Dio",
"Enea",
""
],
[
"Durrer",
"Ruth",
""
]
] | Hawking's quasi-local energy definition quantifies the energy enclosed by a spacelike 2-sphere in terms of the amount of lightbending on the sphere caused by the energy distribution inside the sphere. This paper establishes for the first time a direct connection between the formal mathematical definition of a quasi-loc... |
1211.5909 | Mustapha Azreg-A\"inou | Mustapha Azreg-A\"inou and Manuel E. Rodrigues | Thermodynamical, geometrical and Poincar\'e methods for charged black
holes in presence of quintessence | 25 pages, 11 figures. To appear in JHEP | JHEP 09 (2013) 146 | 10.1007/JHEP09(2013)146 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Properties pertaining to thermodynamical local stability of
Reissner-Nordstr\"om black holes surrounded by quintessence as well as
adiabatic invariance, adiabatic charging and a generalized Smarr formula are
discussed. Limits for the entropy, temperature and electric potential ensuring
stability of canonical ensemble... | [
{
"created": "Mon, 26 Nov 2012 10:59:08 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Sep 2013 13:30:46 GMT",
"version": "v2"
}
] | 2014-01-29 | [
[
"Azreg-Aïnou",
"Mustapha",
""
],
[
"Rodrigues",
"Manuel E.",
""
]
] | Properties pertaining to thermodynamical local stability of Reissner-Nordstr\"om black holes surrounded by quintessence as well as adiabatic invariance, adiabatic charging and a generalized Smarr formula are discussed. Limits for the entropy, temperature and electric potential ensuring stability of canonical ensembles ... |
1702.01754 | Radouane Gannouji | Miguel Cruz, Apratim Ganguly, Radouane Gannouji, Genly Leon, Emmanuel
N. Saridakis | Global structure of static spherically symmetric solutions surrounded by
quintessence | 37 pages, 5 figures; Accepted for publication in Class. Quantum Grav | Class. Quantum Grav. 34 (2017) 125014 | 10.1088/1361-6382/aa70fc | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate all static spherically symmetric solutions in the context of
general relativity surrounded by a minimally-coupled quintessence field, using
dynamical system analysis. Applying the 1+1+2 formalism and introducing
suitable normalized variables involving the Gaussian curvature, we were able to
reformulate... | [
{
"created": "Mon, 6 Feb 2017 19:00:02 GMT",
"version": "v1"
},
{
"created": "Fri, 26 May 2017 03:27:49 GMT",
"version": "v2"
}
] | 2017-05-29 | [
[
"Cruz",
"Miguel",
""
],
[
"Ganguly",
"Apratim",
""
],
[
"Gannouji",
"Radouane",
""
],
[
"Leon",
"Genly",
""
],
[
"Saridakis",
"Emmanuel N.",
""
]
] | We investigate all static spherically symmetric solutions in the context of general relativity surrounded by a minimally-coupled quintessence field, using dynamical system analysis. Applying the 1+1+2 formalism and introducing suitable normalized variables involving the Gaussian curvature, we were able to reformulate t... |
gr-qc/0103015 | Yuri N. Obukhov | Thoralf Chrobok, Yuri N. Obukhov, and Mike Scherfner | On closed rotating worlds | 10 pages, Revtex, to appear in Phys. Rev. D63 | Phys.Rev. D63 (2001) 104014 | 10.1103/PhysRevD.63.104014 | null | gr-qc astro-ph | null | A new solution for the stationary closed world with rigid rotation is
obtained for the spinning fluid source. It is found that the spin and vorticity
are locally balanced. This model qualitatively shows that the local rotation of
the cosmological matter can be indeed related to the global cosmic vorticity,
provided t... | [
{
"created": "Tue, 6 Mar 2001 15:12:39 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Chrobok",
"Thoralf",
""
],
[
"Obukhov",
"Yuri N.",
""
],
[
"Scherfner",
"Mike",
""
]
] | A new solution for the stationary closed world with rigid rotation is obtained for the spinning fluid source. It is found that the spin and vorticity are locally balanced. This model qualitatively shows that the local rotation of the cosmological matter can be indeed related to the global cosmic vorticity, provided the... |
1110.6928 | Tehani Finch | Tehani K. Finch and James Lindesay | Global Causal Structure of a Transient Black Object | 25 pages, 12 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A singularity-free and spherically symmetric transient black object whose
center remains always timelike, yet directly manifests a trapped region, has
been constructed and numerically implemented. The exterior geometry is shown to
be similar to that of a long-lived transient black hole, with a few subtle
differences.... | [
{
"created": "Mon, 31 Oct 2011 19:56:11 GMT",
"version": "v1"
}
] | 2011-11-01 | [
[
"Finch",
"Tehani K.",
""
],
[
"Lindesay",
"James",
""
]
] | A singularity-free and spherically symmetric transient black object whose center remains always timelike, yet directly manifests a trapped region, has been constructed and numerically implemented. The exterior geometry is shown to be similar to that of a long-lived transient black hole, with a few subtle differences. T... |
gr-qc/0207045 | Amos Ori | Amos Ori | Reconstruction of inhomogeneous metric perturbations and electromagnetic
four-potential in Kerr spacetime | 20 pages; few typos corrected and minor modifications made; accepted
to Phys. Rev. D | Phys.Rev. D67 (2003) 124010 | 10.1103/PhysRevD.67.124010 | null | gr-qc | null | We present a procedure that allows the construction of the metric
perturbations and electromagnetic four-potential, for gravitational and
electromagnetic perturbations produced by sources in Kerr spacetime. This may
include, for example, the perturbations produced by a point particle or an
extended object moving in o... | [
{
"created": "Thu, 11 Jul 2002 09:12:03 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Dec 2002 13:27:21 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Ori",
"Amos",
""
]
] | We present a procedure that allows the construction of the metric perturbations and electromagnetic four-potential, for gravitational and electromagnetic perturbations produced by sources in Kerr spacetime. This may include, for example, the perturbations produced by a point particle or an extended object moving in orb... |
gr-qc/9606058 | null | Eva K. Grebel (Sternwarte Bonn, University of Illinois, and Wuerzburg
University) | Be star surveys with CCD photometry. II. NGC 1818 and its neighbouring
cluster in the LMC | LaTeX source with links to 25 postscript figures. Complete postscript
version of the paper with all figures and an ASCII version of Table 2 also
available at http://www.astro.uiuc.edu/~grebel/abs96_aa_n1818be.html Accepted
for publication in A&A | null | null | null | gr-qc | null | As part of an ongoing photometric survey of young Magellanic Cloud clusters
we identified Be stars in NGC 1818 and a nearby smaller cluster in the Large
Magellanic Cloud. The neighbouring cluster does not contain evolved stars, and
its sparsely populated main sequence does not extend to stars as massive as in
NGC 181... | [
{
"created": "Wed, 19 Jun 1996 02:46:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Grebel",
"Eva K.",
"",
"Sternwarte Bonn, University of Illinois, and Wuerzburg\n University"
]
] | As part of an ongoing photometric survey of young Magellanic Cloud clusters we identified Be stars in NGC 1818 and a nearby smaller cluster in the Large Magellanic Cloud. The neighbouring cluster does not contain evolved stars, and its sparsely populated main sequence does not extend to stars as massive as in NGC 1818.... |
2102.01555 | Luca Guido Molinari | Carlo Alberto Mantica and Luca Guido Molinari | Doubly Torqued Vectors and a classification of Doubly Twisted and Kundt
spacetimes | 9 pages, 3 tables. Equation in text (3 lines below table 2) has been
corrected | Gen Relativ Gravit 53, 48 (2021) - open access | 10.1007/s10714-021-02819-x | null | gr-qc math.DG | http://creativecommons.org/licenses/by/4.0/ | The simple structure of doubly torqued vectors allows for a natural
characterization of doubly twisted down to warped spacetimes, as well as Kundt
spacetimes down to PP waves. For the first ones the vectors are timelike, for
the others they are null. We also discuss some properties, and their connection
to hypersurfa... | [
{
"created": "Mon, 1 Feb 2021 12:30:33 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Feb 2021 19:47:22 GMT",
"version": "v2"
}
] | 2021-05-04 | [
[
"Mantica",
"Carlo Alberto",
""
],
[
"Molinari",
"Luca Guido",
""
]
] | The simple structure of doubly torqued vectors allows for a natural characterization of doubly twisted down to warped spacetimes, as well as Kundt spacetimes down to PP waves. For the first ones the vectors are timelike, for the others they are null. We also discuss some properties, and their connection to hypersurface... |
1911.07500 | Colin MacLaurin | Colin MacLaurin | Clarifying spatial distance measurement | 6 pages, 0 figures, submitted to the proceedings of the 2018 Marcel
Grossmann conference, Rome. v2 has minor rewording and typo corrections | p.1372--77 in Battistelli, Jantzen & Ruffini, eds., The Fifteenth
Marcel Grossmann Meeting (World Scientific, 2022, vol. 2) | 10.1142/9789811258251_0198 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine length measurement in curved spacetime, based on the 1+3-splitting
of a local observer frame. This situates extended objects within spacetime, in
terms of a given coordinate which serves as an external reference. The radar
metric is shown to coincide with the spatial projector, but these only give
meaningf... | [
{
"created": "Mon, 18 Nov 2019 09:39:33 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Nov 2019 03:32:10 GMT",
"version": "v2"
}
] | 2022-09-05 | [
[
"MacLaurin",
"Colin",
""
]
] | We examine length measurement in curved spacetime, based on the 1+3-splitting of a local observer frame. This situates extended objects within spacetime, in terms of a given coordinate which serves as an external reference. The radar metric is shown to coincide with the spatial projector, but these only give meaningful... |
gr-qc/0305081 | Saulo Carneiro | Saulo Carneiro | On the vacuum entropy and the cosmological constant | Version to appear in the GRF2003 Special Issue of IJMPD | Int.J.Mod.Phys. D12 (2003) 1669-1674 | 10.1142/S0218271803004158 | null | gr-qc astro-ph hep-th | null | It is generally accepted that the entropy of an asymptotically de Sitter
universe is bounded by the area, in Planck units, of the de Sitter horizon.
Based on an analysis of the entropy associated to the vacuum quantum
fluctuations, we suggest that the existence of such a holographic bound
constitutes a possible expla... | [
{
"created": "Wed, 21 May 2003 17:25:04 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Jul 2003 21:22:37 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Carneiro",
"Saulo",
""
]
] | It is generally accepted that the entropy of an asymptotically de Sitter universe is bounded by the area, in Planck units, of the de Sitter horizon. Based on an analysis of the entropy associated to the vacuum quantum fluctuations, we suggest that the existence of such a holographic bound constitutes a possible explana... |
1712.00738 | Lorenzo Sebastiani | Lorenzo Sebastiani, Shynaray Myrzakul, Ratbay Myrzakulov | Reconstruction of inflation from scalar field non-minimally coupled with
the Gauss-Bonnet term | 11 pages, accepted in EPJ Plus | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we analyze the early-time inflation in a scalar-tensor theory
of gravity where the scalar field is minimally coupled with the Gauss-Bonnet
four dimensional topological invariant. The theory belongs to a class of
Horndeski models where the field equations are at the second order like in
General Relativi... | [
{
"created": "Sun, 3 Dec 2017 09:43:10 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Dec 2017 09:35:41 GMT",
"version": "v2"
}
] | 2017-12-11 | [
[
"Sebastiani",
"Lorenzo",
""
],
[
"Myrzakul",
"Shynaray",
""
],
[
"Myrzakulov",
"Ratbay",
""
]
] | In this paper, we analyze the early-time inflation in a scalar-tensor theory of gravity where the scalar field is minimally coupled with the Gauss-Bonnet four dimensional topological invariant. The theory belongs to a class of Horndeski models where the field equations are at the second order like in General Relativity... |
gr-qc/9411074 | Luis Octavio Pimentel | Pimentel L O, Camacho A and Macias A | Weyl Equation in G\"Odel Type Universes | 9pages, latex,no figures | Mod.Phys.Lett. A9 (1994) 3703-3706 | null | UAMI-GA-940031 | gr-qc | null | The Weyl equation (massless Dirac equation) is studied in a family of metrics
of the G\"odel type. The field equation is solved exactly for one member of the
family.
| [
{
"created": "Tue, 29 Nov 1994 22:15:57 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"O",
"Pimentel L",
""
],
[
"A",
"Camacho",
""
],
[
"A",
"Macias",
""
]
] | The Weyl equation (massless Dirac equation) is studied in a family of metrics of the G\"odel type. The field equation is solved exactly for one member of the family. |
1001.4384 | S Habib Mazharimousavi | S. Habib Mazharimousavi, M. Halilsoy and Z. Amirabi | Stability of thin-shell wormholes supported by ordinary matter in
Einstein-Maxwell-Gauss-Bonnet gravity | 11 pages, 4 figures | Phys.Rev.D81:104002,2010 | 10.1103/PhysRevD.81.104002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently in (Phys. Rev. D 76, 087502 (2007) and Phys. Rev. D 77, 089903(E)
(2008)) a thin-shell wormhole has been introduced in 5-dimensional
Einstein-Maxwell-Gauss-Bonnet (EMGB) gravity which was supported by normal
matter. We wish to consider this solution and investigate its stability. Our
analysis shows that for ... | [
{
"created": "Mon, 25 Jan 2010 11:02:41 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Jan 2010 09:47:58 GMT",
"version": "v2"
},
{
"created": "Wed, 31 Mar 2010 14:29:41 GMT",
"version": "v3"
}
] | 2015-03-13 | [
[
"Mazharimousavi",
"S. Habib",
""
],
[
"Halilsoy",
"M.",
""
],
[
"Amirabi",
"Z.",
""
]
] | Recently in (Phys. Rev. D 76, 087502 (2007) and Phys. Rev. D 77, 089903(E) (2008)) a thin-shell wormhole has been introduced in 5-dimensional Einstein-Maxwell-Gauss-Bonnet (EMGB) gravity which was supported by normal matter. We wish to consider this solution and investigate its stability. Our analysis shows that for th... |
2111.13890 | Hyat Huang | Min-Yan Ou, Meng-Yun Lai and Hyat Huang | Echoes from Asymmetric Wormholes and Black Bounce | 16 pages, 6 figures, Comments welcome | null | 10.1140/epjc/s10052-022-10421-x | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | The time evolution of the field perturbations in the wormhole and black
bounce backgrounds are investigated. We find that the asymmetry of spacetime
results in the asymmetry of the effective potential of the perturbed equation.
The quasinormal modes are strongly dependent on the shapes of the effective
potentials. Sp... | [
{
"created": "Sat, 27 Nov 2021 13:14:15 GMT",
"version": "v1"
}
] | 2022-06-01 | [
[
"Ou",
"Min-Yan",
""
],
[
"Lai",
"Meng-Yun",
""
],
[
"Huang",
"Hyat",
""
]
] | The time evolution of the field perturbations in the wormhole and black bounce backgrounds are investigated. We find that the asymmetry of spacetime results in the asymmetry of the effective potential of the perturbed equation. The quasinormal modes are strongly dependent on the shapes of the effective potentials. Spec... |
gr-qc/0311034 | Bryan Kelleher | Bryan Kelleher | Gravity on Conformal Superspace | PhD thesis, 2003 University College Cork, Ireland | null | null | null | gr-qc | null | The configuration space of general relativity is superspace - the space of
all Riemannian 3-metrics modulo diffeomorphisms. However, it has been argued
that the configuration space for gravity should be conformal superspace - the
space of all Riemannian 3-metrics modulo diffeomorphisms and conformal
transformations. ... | [
{
"created": "Tue, 11 Nov 2003 00:12:49 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kelleher",
"Bryan",
""
]
] | The configuration space of general relativity is superspace - the space of all Riemannian 3-metrics modulo diffeomorphisms. However, it has been argued that the configuration space for gravity should be conformal superspace - the space of all Riemannian 3-metrics modulo diffeomorphisms and conformal transformations. Ta... |
1907.10221 | Carlos Albertho Benavides-Gallego | Carlos A. Benavides-Gallego and Ahmadjon Abdujabbarov | Boosted Kerr black hole in the presence of plasma | 14 pages, 8 figures. Talk given at the meeting "Recent Progress in
Relativistic Astrophysics" (6-8 May 2019, Shanghai, China) | null | 10.3390/proceedings2019017006 | proceedings-569645 | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this work, we obtain the deflection angle for a boosted Kerr black hole in
the weak field approximation using the optics in a curved spacetime developed
by J.L. Synge in 1960. We study the behavior of light in the presence of plasma
by considering different distributions: uniform plasma, singular isothermal
sphere... | [
{
"created": "Wed, 24 Jul 2019 03:39:33 GMT",
"version": "v1"
}
] | 2021-11-24 | [
[
"Benavides-Gallego",
"Carlos A.",
""
],
[
"Abdujabbarov",
"Ahmadjon",
""
]
] | In this work, we obtain the deflection angle for a boosted Kerr black hole in the weak field approximation using the optics in a curved spacetime developed by J.L. Synge in 1960. We study the behavior of light in the presence of plasma by considering different distributions: uniform plasma, singular isothermal sphere, ... |
gr-qc/0701123 | Pedro Marronetti | Pedro Marronetti, Wolfgang Tichy, Bernd Bruegmann, Jose Gonzalez, Mark
Hannam, Sascha Husa, Ulrich Sperhake | Binary black holes on a budget: Simulations using workstations | 20 pages, 8 figures. Final version, to appear in a special issue of
Class. Quantum Grav. based on the New Frontiers in Numerical Relativity
Conference, Golm, July 2006 | Class.Quant.Grav.24:S43-S58,2007 | 10.1088/0264-9381/24/12/S05 | null | gr-qc | null | Binary black hole simulations have traditionally been computationally very
expensive: current simulations are performed in supercomputers involving dozens
if not hundreds of processors, thus systematic studies of the parameter space
of binary black hole encounters still seem prohibitive with current technology.
Here ... | [
{
"created": "Mon, 22 Jan 2007 17:39:46 GMT",
"version": "v1"
},
{
"created": "Sun, 20 May 2007 14:03:15 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Marronetti",
"Pedro",
""
],
[
"Tichy",
"Wolfgang",
""
],
[
"Bruegmann",
"Bernd",
""
],
[
"Gonzalez",
"Jose",
""
],
[
"Hannam",
"Mark",
""
],
[
"Husa",
"Sascha",
""
],
[
"Sperhake",
"Ulrich",
""
]
] | Binary black hole simulations have traditionally been computationally very expensive: current simulations are performed in supercomputers involving dozens if not hundreds of processors, thus systematic studies of the parameter space of binary black hole encounters still seem prohibitive with current technology. Here we... |
1408.1101 | Jos\'e Villanueva | Sergio del Campo, V\'ictor C\'ardenas, Juan Maga\~na and J. R.
Villanueva | Semi-holographic model including the radiation component | 14 pages, 6 figures. arXiv admin note: text overlap with
arXiv:1306.6612 | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this letter we study the semi holographic model which corresponds to the
radiative version of the model proposed by Zhang et al. (Phys. Lett. B 694
(2010), 177) and revisited by C\'ardenas et al. (Mon. Not. Roy. Astron. Soc.
438 (2014), 3603). This inclusion makes the model more realistic, so allows us
to test it ... | [
{
"created": "Tue, 5 Aug 2014 20:04:35 GMT",
"version": "v1"
}
] | 2014-08-07 | [
[
"del Campo",
"Sergio",
""
],
[
"Cárdenas",
"Víctor",
""
],
[
"Magaña",
"Juan",
""
],
[
"Villanueva",
"J. R.",
""
]
] | In this letter we study the semi holographic model which corresponds to the radiative version of the model proposed by Zhang et al. (Phys. Lett. B 694 (2010), 177) and revisited by C\'ardenas et al. (Mon. Not. Roy. Astron. Soc. 438 (2014), 3603). This inclusion makes the model more realistic, so allows us to test it wi... |
1101.3497 | Eric Gourgoulhon | Eric Gourgoulhon, Charalampos Markakis, Koji Uryu and Yoshiharu
Eriguchi | Magnetohydrodynamics in stationary and axisymmetric spacetimes: a fully
covariant approach | Minor modifications (text only); published version (28 pages) | Phys.Rev.D83:104007,2011 | 10.1103/PhysRevD.83.104007 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A fully geometrical treatment of general relativistic magnetohydrodynamics
(GRMHD) is developed under the hypotheses of perfect conductivity, stationarity
and axisymmetry. The spacetime is not assumed to be circular, which allows for
greater generality than the Kerr-type spacetimes usually considered in GRMHD.
Expres... | [
{
"created": "Tue, 18 Jan 2011 16:49:36 GMT",
"version": "v1"
},
{
"created": "Wed, 4 May 2011 13:33:20 GMT",
"version": "v2"
}
] | 2011-05-12 | [
[
"Gourgoulhon",
"Eric",
""
],
[
"Markakis",
"Charalampos",
""
],
[
"Uryu",
"Koji",
""
],
[
"Eriguchi",
"Yoshiharu",
""
]
] | A fully geometrical treatment of general relativistic magnetohydrodynamics (GRMHD) is developed under the hypotheses of perfect conductivity, stationarity and axisymmetry. The spacetime is not assumed to be circular, which allows for greater generality than the Kerr-type spacetimes usually considered in GRMHD. Expressi... |
1504.00928 | Eliu Huerta | E. A. Huerta, Sean T. McWilliams, Jonathan R. Gair and Stephen R.
Taylor | Detection of eccentric supermassive black hole binaries with pulsar
timing arrays: Signal-to-noise ratio calculations | 18 pages, 9 figures, 3 Appendices. Submitted to PRD. v2: typos
corrected, references added. Accepted to PRD | Phys. Rev. D 92, 063010 (2015) | 10.1103/PhysRevD.92.063010 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a detailed analysis of the expected signal-to-noise ratios of
supermassive black hole binaries on eccentric orbits observed by pulsar timing
arrays. We derive several analytical relations that extend the results of
Peters and Mathews [Phys. Rev. D 131, 435 (1963)] to quantify the impact of
eccentricity in ... | [
{
"created": "Fri, 3 Apr 2015 20:00:51 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Sep 2015 17:16:50 GMT",
"version": "v2"
}
] | 2015-09-11 | [
[
"Huerta",
"E. A.",
""
],
[
"McWilliams",
"Sean T.",
""
],
[
"Gair",
"Jonathan R.",
""
],
[
"Taylor",
"Stephen R.",
""
]
] | We present a detailed analysis of the expected signal-to-noise ratios of supermassive black hole binaries on eccentric orbits observed by pulsar timing arrays. We derive several analytical relations that extend the results of Peters and Mathews [Phys. Rev. D 131, 435 (1963)] to quantify the impact of eccentricity in th... |
1405.4011 | Saurya Das | Saurya Das | Cosmic coincidence or graviton mass? | This essay received an Honorable Mention in the 2014 Gravity Research
Foundation Essay Competition. 2 pages, revtex4. arXiv admin note: text
overlap with arXiv:1404.3093 | null | 10.1142/S0218271814420176 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the quantum corrected Friedmann equation, obtained from the quantum
Raychudhuri equation, and assuming a small mass of the graviton (but consistent
with observations and theory), we propose a resolution of the smallness
problem(why is observed vacuum energy so small?) and the coincidence
problem(why does it con... | [
{
"created": "Thu, 15 May 2014 20:53:47 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Das",
"Saurya",
""
]
] | Using the quantum corrected Friedmann equation, obtained from the quantum Raychudhuri equation, and assuming a small mass of the graviton (but consistent with observations and theory), we propose a resolution of the smallness problem(why is observed vacuum energy so small?) and the coincidence problem(why does it const... |
0902.1238 | Luis Manuel Gonzalez-Romero | L. M. Gonz\'alez-Romero and F. Navarro-L\'erida | Neutron Stars Properties and Crust Movements in Post-glitch Epoch | Latex, 4 pages, 3 eps figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using a new numerical code with non-uniform adapted mesh, we study the
changes produced in the global properties of neutron stars by the motion of
matter in crust region during post-glitch epoch. Our numerical analysis shows
that these changes may contribute to explain the observed spin-down of
rotational frequency.
| [
{
"created": "Sat, 7 Feb 2009 13:25:34 GMT",
"version": "v1"
}
] | 2009-02-10 | [
[
"González-Romero",
"L. M.",
""
],
[
"Navarro-Lérida",
"F.",
""
]
] | Using a new numerical code with non-uniform adapted mesh, we study the changes produced in the global properties of neutron stars by the motion of matter in crust region during post-glitch epoch. Our numerical analysis shows that these changes may contribute to explain the observed spin-down of rotational frequency. |
gr-qc/9806089 | Yasunori Fujii | Yasunori Fujii | Nonzero $\Omega_{\Lambda}$ and a new type of the dissipative structure | LaTex, 6 pages, 2 figures | null | null | NFU-98-11 | gr-qc astro-ph | null | We revisit the proposed theoretical model for a small but nonzero
cosmological constant which seems supported increasingly better by recent
observations. The model features two scalar fields which interact with each
other through a specifically chosen nonlinear potential. We find a very
sensitive dependence of the so... | [
{
"created": "Tue, 23 Jun 1998 11:40:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Fujii",
"Yasunori",
""
]
] | We revisit the proposed theoretical model for a small but nonzero cosmological constant which seems supported increasingly better by recent observations. The model features two scalar fields which interact with each other through a specifically chosen nonlinear potential. We find a very sensitive dependence of the solu... |
1108.4421 | Yosef Zlochower | Hiroyuki Nakano, Yosef Zlochower, Carlos O. Lousto, Manuela Campanelli | Intermediate-mass-ratio black hole binaries II: Modeling Trajectories
and Gravitational Waveforms | 23 pages, 35 figures, revtex4 | Phys. Rev. D 84, 124006 (2011) | 10.1103/PhysRevD.84.124006 | null | gr-qc astro-ph.CO astro-ph.GA astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the scenario of small-mass-ratio (q) black-hole binaries;
performing new, more accurate, simulations of mass ratios 10:1 and 100:1 for
initially nonspinning black holes. We propose fitting functions for the
trajectories of the two black holes as a function of time and mass ratio (in
the range 1/100 < q < 1... | [
{
"created": "Mon, 22 Aug 2011 20:01:09 GMT",
"version": "v1"
}
] | 2011-12-13 | [
[
"Nakano",
"Hiroyuki",
""
],
[
"Zlochower",
"Yosef",
""
],
[
"Lousto",
"Carlos O.",
""
],
[
"Campanelli",
"Manuela",
""
]
] | We revisit the scenario of small-mass-ratio (q) black-hole binaries; performing new, more accurate, simulations of mass ratios 10:1 and 100:1 for initially nonspinning black holes. We propose fitting functions for the trajectories of the two black holes as a function of time and mass ratio (in the range 1/100 < q < 1/1... |
1506.08650 | Hooman Moradpour Hooman | H. Moradpour and S. Nasirimoghadam | Thermodynamic motivations of spherically symmetric static metrics | Accepted by Rom. J. Phys | Rom. Journ. Phys. Vol. 61, Nos. 9-10, P. 1453--1464 (2016) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Bearing the thermodynamic arguments together with the two definitions of mass
in mind, we try to find metrics with spherical symmetry. We consider the
adiabatic condition along with the Gong-Wang mass, and evaluate the $g_{rr}$
element which points to a null hypersurface. In addition, we generalize the
thermodynamics... | [
{
"created": "Sun, 14 Jun 2015 04:03:41 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Nov 2015 09:01:22 GMT",
"version": "v2"
},
{
"created": "Mon, 4 Apr 2016 07:51:01 GMT",
"version": "v3"
}
] | 2016-12-23 | [
[
"Moradpour",
"H.",
""
],
[
"Nasirimoghadam",
"S.",
""
]
] | Bearing the thermodynamic arguments together with the two definitions of mass in mind, we try to find metrics with spherical symmetry. We consider the adiabatic condition along with the Gong-Wang mass, and evaluate the $g_{rr}$ element which points to a null hypersurface. In addition, we generalize the thermodynamics l... |
1908.08784 | Recai Erdem | Recai Erdem and Kemal G\"ultekin | A mechanism for formation of Bose-Einstein condensation in cosmology | Some technical details in the main text are moved to two appendices.
Typos are fixed, and the presentation of the manuscript is improved | null | 10.1088/1475-7516/2019/10/061 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a toy model of scalar particles with a trilinear scalar coupling
in cosmology. The trilinear coupling $\phi^2\chi$ causes production of
non-relativistic $\phi$ particles through the process
$\chi\chi\,\rightarrow\,\phi\phi$ where, initially, only relativistic $\chi$
particles are present. We consider the... | [
{
"created": "Fri, 23 Aug 2019 15:50:32 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Oct 2019 06:29:51 GMT",
"version": "v2"
}
] | 2019-11-06 | [
[
"Erdem",
"Recai",
""
],
[
"Gültekin",
"Kemal",
""
]
] | We introduce a toy model of scalar particles with a trilinear scalar coupling in cosmology. The trilinear coupling $\phi^2\chi$ causes production of non-relativistic $\phi$ particles through the process $\chi\chi\,\rightarrow\,\phi\phi$ where, initially, only relativistic $\chi$ particles are present. We consider the i... |
1007.0067 | Shun-Zhi Wang | Shun-Zhi Wang | Hexad Preons and Emergent Gravity in 3-dimensional Complex Spacetime | 5 pages, no figure | null | null | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We suggest that at high energy each space dimension has their own time
dimension, forming a 3-dimensional complex spacetime. Based on this hypothesis,
we propose that the primordial universe is made of six fundamental
anticommutative fields and their complex conjugate states. These fields are
called Hexad Preons whic... | [
{
"created": "Thu, 1 Jul 2010 05:06:55 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Mar 2012 08:20:49 GMT",
"version": "v2"
},
{
"created": "Tue, 3 Apr 2012 08:08:38 GMT",
"version": "v3"
}
] | 2012-04-04 | [
[
"Wang",
"Shun-Zhi",
""
]
] | We suggest that at high energy each space dimension has their own time dimension, forming a 3-dimensional complex spacetime. Based on this hypothesis, we propose that the primordial universe is made of six fundamental anticommutative fields and their complex conjugate states. These fields are called Hexad Preons which ... |
1902.01422 | Vasilis Oikonomou | S.D Odintsov, V.K. Oikonomou | Effects of Spatial Curvature on the $f(R)$ Gravity Phase Space: no
Inflationary Attractor? | CQG Accepted | null | 10.1088/1361-6382/ab0505 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the effects of spatial curvature of the metric on the
phase space of vacuum $f(R)$ gravity. Particularly, we appropriately choose the
variables of the dynamical system, in order for this to be autonomous, and we
study the phase space of the resulting theory, focusing on de Sitter, matter
and ra... | [
{
"created": "Mon, 4 Feb 2019 19:02:21 GMT",
"version": "v1"
}
] | 2019-05-22 | [
[
"Odintsov",
"S. D",
""
],
[
"Oikonomou",
"V. K.",
""
]
] | In this paper we study the effects of spatial curvature of the metric on the phase space of vacuum $f(R)$ gravity. Particularly, we appropriately choose the variables of the dynamical system, in order for this to be autonomous, and we study the phase space of the resulting theory, focusing on de Sitter, matter and radi... |
1510.01377 | John W. Barrett | John W. Barrett, Lisa Glaser | Monte Carlo simulations of random non-commutative geometries | 35 pages, author manuscript accepted by journal | null | 10.1088/1751-8113/49/24/245001 | null | gr-qc hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Random non-commutative geometries are introduced by integrating over the
space of Dirac operators that form a spectral triple with a fixed algebra and
Hilbert space. The cases with the simplest types of Clifford algebra are
investigated using Monte Carlo simulations to compute the integrals. Various
qualitatively dif... | [
{
"created": "Mon, 5 Oct 2015 21:45:14 GMT",
"version": "v1"
},
{
"created": "Wed, 11 May 2016 14:39:08 GMT",
"version": "v2"
}
] | 2016-06-22 | [
[
"Barrett",
"John W.",
""
],
[
"Glaser",
"Lisa",
""
]
] | Random non-commutative geometries are introduced by integrating over the space of Dirac operators that form a spectral triple with a fixed algebra and Hilbert space. The cases with the simplest types of Clifford algebra are investigated using Monte Carlo simulations to compute the integrals. Various qualitatively diffe... |
1107.5183 | Santiago Esteban Perez Bergliaffa | Santiago Esteban Perez Bergliaffa | An overview of f(R) theories | Talk given at the XIV Brazilian School of Cosmology and Gravitation
(2010), included in the proceedings to be published by Cambridge U. Press,
references added | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A brief introduction to theories of the gravitational field with a Lagrangian
that is a function of the scalar curvature is given. The emphasis will be
placed in formal developments, while comparison to observation will be
discussed in the chapter by S. Jor\'as in this volume.
| [
{
"created": "Tue, 26 Jul 2011 11:50:57 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Nov 2011 21:07:25 GMT",
"version": "v2"
}
] | 2011-11-14 | [
[
"Bergliaffa",
"Santiago Esteban Perez",
""
]
] | A brief introduction to theories of the gravitational field with a Lagrangian that is a function of the scalar curvature is given. The emphasis will be placed in formal developments, while comparison to observation will be discussed in the chapter by S. Jor\'as in this volume. |
2111.15583 | Fabian L\'aszl\'o Konstantin Wagner | Fabian Wagner | Relativistic Extended Uncertainty Principle from Spacetime Curvature | 22 pages, 5 figures | Phys. Rev. D 105, 025005 (2022) | 10.1103/PhysRevD.105.025005 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The investigations presented in this study are directed at relativistic
modifications of the uncertainty relation derived from the curvature of the
background spacetime. These findings generalize previous work which is
recovered in the nonrelativistic limit. Applying the 3+1-splitting in
accordance with the ADM-forma... | [
{
"created": "Tue, 30 Nov 2021 17:21:49 GMT",
"version": "v1"
}
] | 2022-10-12 | [
[
"Wagner",
"Fabian",
""
]
] | The investigations presented in this study are directed at relativistic modifications of the uncertainty relation derived from the curvature of the background spacetime. These findings generalize previous work which is recovered in the nonrelativistic limit. Applying the 3+1-splitting in accordance with the ADM-formali... |
1203.1580 | Hossein Mohseni Sadjadi | H. Mohseni Sadjadi and Parviz Goodarzi | Reheating in nonminimal derivative coupling model | 16 pages, 5 figures; discussions added; accepted by JCAP | JCAP02(2013)038 | 10.1088/1475-7516/2013/02/038 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a model with nonminimal derivative coupling of inflaton to
gravity. The reheating process during rapid oscillation of the inflaton is
studied and the reheating temperature is obtained. Behaviors of the inflaton
and produced radiation in this era are discussed.
| [
{
"created": "Wed, 7 Mar 2012 19:40:17 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Jul 2012 13:17:12 GMT",
"version": "v2"
},
{
"created": "Sun, 3 Feb 2013 10:07:03 GMT",
"version": "v3"
}
] | 2015-06-04 | [
[
"Sadjadi",
"H. Mohseni",
""
],
[
"Goodarzi",
"Parviz",
""
]
] | We consider a model with nonminimal derivative coupling of inflaton to gravity. The reheating process during rapid oscillation of the inflaton is studied and the reheating temperature is obtained. Behaviors of the inflaton and produced radiation in this era are discussed. |
gr-qc/9408019 | Rainer Mueller | Juergen Audretsch and Rainer Mueller | Spontaneous excitation of an accelerated atom: The contributions of
vacuum fluctuations and radiation reaction | 13 pages, KONS-RGKU-94-09, to appear in Phys. Rev. A | Phys.Rev. A50 (1994) 1755-1763 | 10.1103/PhysRevA.50.1755 | null | gr-qc hep-th | null | We consider an atom in interaction with a massless scalar quantum field. We
discuss the structure of the rate of variation of the atomic energy for an
arbitrary stationary motion of the atom through the quantum vacuum. Our main
intention is to identify and to analyze quantitatively the distinct
contributions of vacuu... | [
{
"created": "Tue, 16 Aug 1994 20:24:57 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Audretsch",
"Juergen",
""
],
[
"Mueller",
"Rainer",
""
]
] | We consider an atom in interaction with a massless scalar quantum field. We discuss the structure of the rate of variation of the atomic energy for an arbitrary stationary motion of the atom through the quantum vacuum. Our main intention is to identify and to analyze quantitatively the distinct contributions of vacuum ... |
gr-qc/9901040 | Kazuhiro Tominaga | Kazuhiro Tominaga, Motoyuki Saijo, and Kei-ichi Maeda | Gravitational waves from a test particle scattered by a neutron star:
Axial mode case | 21 pages, revtex, 11 figures are attached with eps files Accepted to
Phys. Rev. D | Phys.Rev. D60 (1999) 024004 | 10.1103/PhysRevD.60.024004 | WU-AP/76/99 (Waseda Univ. Astrophysics) | gr-qc | null | Using a metric perturbation method, we study gravitational waves from a test
particle scattered by a spherically symmetric relativistic star. We calculate
the energy spectrum and the waveform of gravitational waves for axial modes.
Since metric perturbations in axial modes do not couple to the matter fluid of
the sta... | [
{
"created": "Thu, 14 Jan 1999 14:34:51 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Sep 1999 14:19:59 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Tominaga",
"Kazuhiro",
""
],
[
"Saijo",
"Motoyuki",
""
],
[
"Maeda",
"Kei-ichi",
""
]
] | Using a metric perturbation method, we study gravitational waves from a test particle scattered by a spherically symmetric relativistic star. We calculate the energy spectrum and the waveform of gravitational waves for axial modes. Since metric perturbations in axial modes do not couple to the matter fluid of the star,... |
2108.02841 | Philip Beltracchi | Philip Beltracchi, Paolo Gondolo | Physical interpretation of Newman-Janis rotating systems. II. General
systems | Replaced with updated version, published at Phys. Rev. D 104, 124067
(2021) | null | 10.1103/PhysRevD.104.124067 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Drake and Szekeres have extended the Newman-Janis algorithm to produce
stationary axisymmetric spacetimes from general static spherically symmetric
solutions of the Einstein equations. The algorithm mathematically generates an
energy-momentum tensor for the rotating solution, but the rotating and
nonrotating system m... | [
{
"created": "Thu, 5 Aug 2021 20:47:46 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Dec 2021 21:28:44 GMT",
"version": "v2"
}
] | 2022-01-05 | [
[
"Beltracchi",
"Philip",
""
],
[
"Gondolo",
"Paolo",
""
]
] | Drake and Szekeres have extended the Newman-Janis algorithm to produce stationary axisymmetric spacetimes from general static spherically symmetric solutions of the Einstein equations. The algorithm mathematically generates an energy-momentum tensor for the rotating solution, but the rotating and nonrotating system may... |
0711.0040 | Alexandru Ionescu | Alexandru D. Ionescu and Sergiu Klainerman | On the uniqueness of smooth, stationary black holes in vacuum | Various corrections | null | 10.1007/s00222-008-0146-6 | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove a conditional "no hair" theorem for smooth manifolds: if $E$ is the
domain of outer communication of a smooth, regular, stationary Einstein vacuum,
and if a technical condition relating the Ernst potential and Killing scalar is
satisfied on the bifurcate sphere, then $E$ is locally isometric to the domain
of... | [
{
"created": "Thu, 1 Nov 2007 00:03:04 GMT",
"version": "v1"
},
{
"created": "Sat, 26 Jul 2008 21:20:11 GMT",
"version": "v2"
}
] | 2009-11-13 | [
[
"Ionescu",
"Alexandru D.",
""
],
[
"Klainerman",
"Sergiu",
""
]
] | We prove a conditional "no hair" theorem for smooth manifolds: if $E$ is the domain of outer communication of a smooth, regular, stationary Einstein vacuum, and if a technical condition relating the Ernst potential and Killing scalar is satisfied on the bifurcate sphere, then $E$ is locally isometric to the domain of o... |
1910.08166 | Philip Beltracchi | Philip Beltracchi, Paolo Gondolo | A curious general relativistic sphere | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a particular solution to the Einstein field equations that could
arise as a magnetic monopole in the strong field limit of the Born-Infeld
electrodynamics. We solve its geodesics exactly and show that they can mimic
the gravitational lensing of a singular isothermal sphere, but with matter and
radiation fo... | [
{
"created": "Thu, 17 Oct 2019 21:05:44 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Jul 2020 18:18:30 GMT",
"version": "v2"
}
] | 2020-07-27 | [
[
"Beltracchi",
"Philip",
""
],
[
"Gondolo",
"Paolo",
""
]
] | We present a particular solution to the Einstein field equations that could arise as a magnetic monopole in the strong field limit of the Born-Infeld electrodynamics. We solve its geodesics exactly and show that they can mimic the gravitational lensing of a singular isothermal sphere, but with matter and radiation foll... |
1309.4529 | Israel Quiros | Israel Quiros | Matter Couplings which are Compatible with a Fundamental Theory of
Physics | 13 pages, no figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A criterion to seek for compatibility of any given matter coupling with a
fundamental theory of physics - assumed here to be the string theory - is
developed. We call this criterion as"`compatibility check", and apply it to
test different kinds of matter coupling which are familiar in cosmological
scenarios. The so c... | [
{
"created": "Wed, 18 Sep 2013 03:09:10 GMT",
"version": "v1"
}
] | 2013-09-19 | [
[
"Quiros",
"Israel",
""
]
] | A criterion to seek for compatibility of any given matter coupling with a fundamental theory of physics - assumed here to be the string theory - is developed. We call this criterion as"`compatibility check", and apply it to test different kinds of matter coupling which are familiar in cosmological scenarios. The so cal... |
2407.04862 | Sergei Kopeikin | Sergei M. Kopeikin and George H. Kaplan | Lunar Time in General Relativity | 34 pages, 7 figures, 2 tables, appendix | null | null | null | gr-qc astro-ph.IM physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce the general-relativistic definition of Lunar Coordinate Time
(TCL) based on the IAU 2000 resolutions that provide a framework of
relativistic reference systems. From this foundation, we derive a
transformation equation that describes the relative rate of TCL with respect to
Geocentric Coordinate Time (TC... | [
{
"created": "Fri, 5 Jul 2024 20:54:48 GMT",
"version": "v1"
}
] | 2024-07-09 | [
[
"Kopeikin",
"Sergei M.",
""
],
[
"Kaplan",
"George H.",
""
]
] | We introduce the general-relativistic definition of Lunar Coordinate Time (TCL) based on the IAU 2000 resolutions that provide a framework of relativistic reference systems. From this foundation, we derive a transformation equation that describes the relative rate of TCL with respect to Geocentric Coordinate Time (TCG)... |
gr-qc/0308029 | Ali Mostafazadeh | Ali Mostafazadeh | Wave Function of the Universe and Its Meaning | 9 pages, contributed to the First International Workshop on
Pseudo-Hermitian Hamiltonians in Quantum Physics, held in Prag June 2003 | Czech.J.Phys. 54 (2004) 93-99 | 10.1023/B:CJOP.0000014373.58075.95 | null | gr-qc hep-th quant-ph | null | For a FRW-spacetime coupled to an arbitrary real scalar field, we endow the
solution space of the associated Wheeler-DeWitt equation with a Hilbert-space
structure, construct the observables, and introduce the physical wave functions
of the universe that admit a genuine probabilistic interpretation. We also
discuss a... | [
{
"created": "Mon, 11 Aug 2003 12:07:28 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Mostafazadeh",
"Ali",
""
]
] | For a FRW-spacetime coupled to an arbitrary real scalar field, we endow the solution space of the associated Wheeler-DeWitt equation with a Hilbert-space structure, construct the observables, and introduce the physical wave functions of the universe that admit a genuine probabilistic interpretation. We also discuss a p... |
1703.08160 | Lisa Glaser | L. Glaser and R. Loll | CDT and Cosmology | 14 pages, invited review for a special issue of Compte Rendus
Physique | null | 10.1016/j.crhy.2017.04.002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the approach of Causal Dynamical Triangulations (CDT), quantum gravity is
obtained as a scaling limit of a non-perturbative path integral over
space-times whose causal structure plays a crucial role in the construction.
After some general considerations about the relation between quantum gravity
and cosmology, we ... | [
{
"created": "Thu, 23 Mar 2017 17:44:06 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Nov 2018 15:28:13 GMT",
"version": "v2"
}
] | 2018-11-30 | [
[
"Glaser",
"L.",
""
],
[
"Loll",
"R.",
""
]
] | In the approach of Causal Dynamical Triangulations (CDT), quantum gravity is obtained as a scaling limit of a non-perturbative path integral over space-times whose causal structure plays a crucial role in the construction. After some general considerations about the relation between quantum gravity and cosmology, we ex... |
1610.08548 | Michael Heyl | H.J. Fahr and M. Heyl | Cosmic vacuum energy decay and creation of cosmic matter | 16 pages | Naturwissenschaften 94, 2007, 709 | 10.1007/s00114-007-0235-1 | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | In the more recent literature on cosmological evolutions of the universe the
cosmic vacuum energy has become a non-renouncable ingredient. The cosmological
constant $\Lambda$, first invented by Einstein, but later also rejected by him,
presently experiences an astonishing revival. Interestingly enough it acts,
like a... | [
{
"created": "Thu, 20 Oct 2016 14:45:18 GMT",
"version": "v1"
}
] | 2016-10-28 | [
[
"Fahr",
"H. J.",
""
],
[
"Heyl",
"M.",
""
]
] | In the more recent literature on cosmological evolutions of the universe the cosmic vacuum energy has become a non-renouncable ingredient. The cosmological constant $\Lambda$, first invented by Einstein, but later also rejected by him, presently experiences an astonishing revival. Interestingly enough it acts, like a c... |
0708.1236 | Carlo Rovelli | Jonathan Engle, Roberto Pereira, Carlo Rovelli | Flipped spinfoam vertex and loop gravity | 37 pages, 4 figures | Nucl.Phys.B798:251-290,2008 | 10.1016/j.nuclphysb.2008.02.002 | null | gr-qc | null | We introduce a vertex amplitude for 4d loop quantum gravity. We derive it
from a conventional quantization of a Regge discretization of euclidean general
relativity. This yields a spinfoam sum that corrects some difficulties of the
Barrett-Crane theory. The second class simplicity constraints are imposed
weakly, and ... | [
{
"created": "Thu, 9 Aug 2007 09:35:40 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Engle",
"Jonathan",
""
],
[
"Pereira",
"Roberto",
""
],
[
"Rovelli",
"Carlo",
""
]
] | We introduce a vertex amplitude for 4d loop quantum gravity. We derive it from a conventional quantization of a Regge discretization of euclidean general relativity. This yields a spinfoam sum that corrects some difficulties of the Barrett-Crane theory. The second class simplicity constraints are imposed weakly, and no... |
1511.07731 | Cemsinan Deliduman | Cemsinan Deliduman, Oguzhan Kasikci, and Baris Yapiskan | Flat Galactic Rotation Curves from Geometry in Weyl Gravity | 8 pages, latex; v2: typos corrected, v3: discussion shortened, v4:
new section added, v5: discussion extended, v6: published version | Astrophys.Space Sci. 365 (2020) 3, 51 | 10.1007/s10509-020-03764-y | null | gr-qc astro-ph.GA hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We searched for a resolution of the flat galactic rotation curve problem from
geometry instead of assuming the existence of dark matter. We observed that the
scale independence of the rotational velocity in the outer region of galaxies
could point out to a possible existence of local scale symmetry and therefore
the ... | [
{
"created": "Tue, 24 Nov 2015 14:36:47 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Dec 2015 10:55:22 GMT",
"version": "v2"
},
{
"created": "Wed, 30 Aug 2017 18:52:37 GMT",
"version": "v3"
},
{
"created": "Sun, 30 Sep 2018 14:38:35 GMT",
"version": "v4"
},
{
"cr... | 2020-04-15 | [
[
"Deliduman",
"Cemsinan",
""
],
[
"Kasikci",
"Oguzhan",
""
],
[
"Yapiskan",
"Baris",
""
]
] | We searched for a resolution of the flat galactic rotation curve problem from geometry instead of assuming the existence of dark matter. We observed that the scale independence of the rotational velocity in the outer region of galaxies could point out to a possible existence of local scale symmetry and therefore the gr... |
2105.01594 | Masoud Ghezelbash | Masoud Ghezelbash | Fubini-Study geometries in the higher-dimensional gravity | 21 pages, 9 figures, typos corrected, references added, some revision | Int. J. of Mod. Phys. A38 (2023) 2350084 | 10.1142/S0217751X23500847 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct approximate solutions to the Einstein-Maxwell theory with
uplifting the four dimensional Fubini-Study Kahler manifold. We find the
solutions can be expressed as the integrals of two special functions. The
solutions are regular almost everywhere except a bolt structure on a single
point in any dimensional... | [
{
"created": "Tue, 4 May 2021 16:06:07 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Jul 2021 15:11:00 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Jun 2023 16:23:06 GMT",
"version": "v3"
}
] | 2024-02-09 | [
[
"Ghezelbash",
"Masoud",
""
]
] | We construct approximate solutions to the Einstein-Maxwell theory with uplifting the four dimensional Fubini-Study Kahler manifold. We find the solutions can be expressed as the integrals of two special functions. The solutions are regular almost everywhere except a bolt structure on a single point in any dimensionalit... |
1011.1024 | Miguel Campiglia | Abhay Ashtekar, Miguel Campiglia, Adam Henderson | Path Integrals and the WKB approximation in Loop Quantum Cosmology | 21 pages, 4 figures | Phys.Rev.D82:124043,2010 | 10.1103/PhysRevD.82.124043 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We follow the Feynman procedure to obtain a path integral formulation of loop
quantum cosmology starting from the Hilbert space framework. Quantum geometry
effects modify the weight associated with each path so that the effective
measure on the space of paths is different from that used in the Wheeler-DeWitt
theory. ... | [
{
"created": "Wed, 3 Nov 2010 22:22:23 GMT",
"version": "v1"
}
] | 2011-01-25 | [
[
"Ashtekar",
"Abhay",
""
],
[
"Campiglia",
"Miguel",
""
],
[
"Henderson",
"Adam",
""
]
] | We follow the Feynman procedure to obtain a path integral formulation of loop quantum cosmology starting from the Hilbert space framework. Quantum geometry effects modify the weight associated with each path so that the effective measure on the space of paths is different from that used in the Wheeler-DeWitt theory. Th... |
1506.06713 | Dong-han Yeom | Pisin Chen, Dong-han Yeom | Cusp singularities in f(R) gravity: pros and cons | 19 pages, 11 figures | JCAP 10(2015)022 | 10.1088/1475-7516/2015/10/022 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate cusp singularities in f(R) gravity, especially for Starobinsky
and Hu-Sawicki dark energy models. We illustrate that, by using double-null
numerical simulations, a cusp singularity can be triggered by gravitational
collapses. This singularity can be cured by adding a quadratic term, but this
causes a R... | [
{
"created": "Mon, 22 Jun 2015 18:28:03 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Oct 2015 05:27:14 GMT",
"version": "v2"
}
] | 2015-10-14 | [
[
"Chen",
"Pisin",
""
],
[
"Yeom",
"Dong-han",
""
]
] | We investigate cusp singularities in f(R) gravity, especially for Starobinsky and Hu-Sawicki dark energy models. We illustrate that, by using double-null numerical simulations, a cusp singularity can be triggered by gravitational collapses. This singularity can be cured by adding a quadratic term, but this causes a Ric... |
gr-qc/0511099 | Gilberto Medeiros Kremer | M. O. Ribas, F. P. Devecchi, G. M. Kremer | Fermions as sources of accelerated regimes in cosmology | 4 figures, accepted in PRD | Phys.Rev. D72 (2005) 123502 | 10.1103/PhysRevD.72.123502 | null | gr-qc | null | In this work it is investigated if fermionic sources could be responsible for
accelerated periods during the evolution of a universe where a matter field
would answer for the decelerated period. The self-interaction potential of the
fermionic field is considered as a function of the scalar and pseudo-scalar
invariant... | [
{
"created": "Thu, 17 Nov 2005 10:24:36 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Ribas",
"M. O.",
""
],
[
"Devecchi",
"F. P.",
""
],
[
"Kremer",
"G. M.",
""
]
] | In this work it is investigated if fermionic sources could be responsible for accelerated periods during the evolution of a universe where a matter field would answer for the decelerated period. The self-interaction potential of the fermionic field is considered as a function of the scalar and pseudo-scalar invariants.... |
gr-qc/0610035 | Yurii V. Dumin | Yurii V. Dumin (Theoretical Department, IZMIRAN, Russian Academy of
Sciences, Troitsk, Moscow reg.) | Can (dG/dt)/G Bound the Local Cosmological Dynamics? | REVTeX4, 1 page | Phys.Rev.Lett. 98 (2007) 059001 | 10.1103/PhysRevLett.98.059001 | null | gr-qc astro-ph hep-ph | null | It is argued that constraints on time variation of the gravitational constant
(dG/dt)/G, e.g. derived from the lunar laser ranging, cannot be immediately
applied to restrict the cosmological expansion at planetary scales, as it was
done by Williams, Turyshev, and Boggs [PRL, 93, 261101 (2004),
arXiv:gr-qc/0411113].
| [
{
"created": "Mon, 9 Oct 2006 15:05:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dumin",
"Yurii V.",
"",
"Theoretical Department, IZMIRAN, Russian Academy of\n Sciences, Troitsk, Moscow reg."
]
] | It is argued that constraints on time variation of the gravitational constant (dG/dt)/G, e.g. derived from the lunar laser ranging, cannot be immediately applied to restrict the cosmological expansion at planetary scales, as it was done by Williams, Turyshev, and Boggs [PRL, 93, 261101 (2004), arXiv:gr-qc/0411113]. |
1111.1325 | Stefano Bertone | Stefano Bertone and Christophe Le Poncin-Lafitte | Light Deflection for relativistic space astrometry in closed form | proceedings of Great-ESF workshop, June 2011, Porto, Portugal | Memorie della Societa Astronomica Italiana, v.83, p.1020 (2012) | null | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Given the extreme accuracy reached by future global space astrometry, one
needs a global relativistic modeling of observations. A relativistic definition
of astrometric observables is then essential to find uniquely coordinates,
parallax and proper motion of a stellar object. The standard procedure is to
explicitly s... | [
{
"created": "Sat, 5 Nov 2011 16:20:23 GMT",
"version": "v1"
},
{
"created": "Fri, 10 May 2013 08:16:59 GMT",
"version": "v2"
}
] | 2013-05-13 | [
[
"Bertone",
"Stefano",
""
],
[
"Poncin-Lafitte",
"Christophe Le",
""
]
] | Given the extreme accuracy reached by future global space astrometry, one needs a global relativistic modeling of observations. A relativistic definition of astrometric observables is then essential to find uniquely coordinates, parallax and proper motion of a stellar object. The standard procedure is to explicitly sol... |
2204.14222 | Peter K.F. Kuhfittig | Peter K.F. Kuhfittig | Periodic signature change in spacetimes of embedding class one | 10 pages, no figures | Int. J. Astron. Astrophys. (IJAA), vol. 12, pp. 167-176, 2022 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The idea of an oscillating Universe has remained a topic of interest even
after the discovery of dark energy. This paper confirms this idea by means of
another well-established theory in general relativity, the embedding of curved
spacetimes in higher-dimensional flat spacetimes: an $n$-dimensional Riemannian
space i... | [
{
"created": "Fri, 29 Apr 2022 16:55:46 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Mar 2024 17:55:40 GMT",
"version": "v2"
},
{
"created": "Wed, 6 Mar 2024 16:11:18 GMT",
"version": "v3"
}
] | 2024-03-07 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | The idea of an oscillating Universe has remained a topic of interest even after the discovery of dark energy. This paper confirms this idea by means of another well-established theory in general relativity, the embedding of curved spacetimes in higher-dimensional flat spacetimes: an $n$-dimensional Riemannian space is ... |
1811.08797 | Nelson Christensen | Nelson Christensen | Stochastic Gravitational Wave Backgrounds | null | Reports on Progress in Physics, Vol. 82, 016903 (2019) | 10.1088/1361-6633/aae6b5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A stochastic background of gravitational waves can be created by the
superposition of a large number of independent sources. The physical processes
occurring at the earliest moments of the universe certainly created a
stochastic background that exists, at some level, today. This is analogous to
the cosmic microwave b... | [
{
"created": "Wed, 21 Nov 2018 15:50:01 GMT",
"version": "v1"
}
] | 2018-11-22 | [
[
"Christensen",
"Nelson",
""
]
] | A stochastic background of gravitational waves can be created by the superposition of a large number of independent sources. The physical processes occurring at the earliest moments of the universe certainly created a stochastic background that exists, at some level, today. This is analogous to the cosmic microwave bac... |
gr-qc/9608008 | Raphael Bousso | Raphael Bousso and Stephen W. Hawking (DAMTP, Cambridge) | Pair Creation and Evolution of Black Holes During Inflation | 8 pages, LaTeX, 3 figures; contribution to the proceedings of the
Journees Relativistes 96, contains extra figures | Helv.Phys.Acta 69:261-264,1996 | null | DAMTP/R-96/35 | gr-qc astro-ph hep-th | null | We summarise recent work on the quantum production of black holes in the
inflationary era. We describe, in simple terms, the Euclidean approach used,
and the results obtained both for the pair creation rate and for the evolution
of the black holes.
| [
{
"created": "Fri, 2 Aug 1996 18:41:31 GMT",
"version": "v1"
}
] | 2011-04-15 | [
[
"Bousso",
"Raphael",
"",
"DAMTP, Cambridge"
],
[
"Hawking",
"Stephen W.",
"",
"DAMTP, Cambridge"
]
] | We summarise recent work on the quantum production of black holes in the inflationary era. We describe, in simple terms, the Euclidean approach used, and the results obtained both for the pair creation rate and for the evolution of the black holes. |
gr-qc/0212034 | Jose Geraldo Pereira | R. Aldrovandi, P. B. Barros and J. G. Pereira | The Equivalence Principle Revisited | RevTeX, 18 pages, no figures, to appear in Foundations of Physics | Found.Phys. 33 (2003) 545-575 | null | null | gr-qc | null | A precise formulation of the strong Equivalence Principle is essential to the
understanding of the relationship between gravitation and quantum mechanics.
The relevant aspects are reviewed in a context including General Relativity,
but allowing for the presence of torsion. For the sake of brevity, a concise
statement... | [
{
"created": "Sat, 7 Dec 2002 18:00:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Aldrovandi",
"R.",
""
],
[
"Barros",
"P. B.",
""
],
[
"Pereira",
"J. G.",
""
]
] | A precise formulation of the strong Equivalence Principle is essential to the understanding of the relationship between gravitation and quantum mechanics. The relevant aspects are reviewed in a context including General Relativity, but allowing for the presence of torsion. For the sake of brevity, a concise statement i... |
2205.13560 | Rebecca Briffa Ms | Rebecca Briffa, Celia Escamilla-Rivera, Jackson Levi Said and Jurgen
Mifsud | $f(T,B)$ Gravity in the late Universe in the context of local
measurements | null | null | 10.1016/j.dark.2022.101153 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We explore the viability of three models in $f(T,B)$ gravity using data from
recent surveys based on cosmic chronometers, the Pantheon data set, and
baryonic acoustic oscillation data. We also assess the consistency of these
models and data set combinations with two important priors on the Hubble
constant coming from... | [
{
"created": "Thu, 26 May 2022 18:01:47 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Dec 2022 14:25:58 GMT",
"version": "v2"
}
] | 2022-12-23 | [
[
"Briffa",
"Rebecca",
""
],
[
"Escamilla-Rivera",
"Celia",
""
],
[
"Said",
"Jackson Levi",
""
],
[
"Mifsud",
"Jurgen",
""
]
] | We explore the viability of three models in $f(T,B)$ gravity using data from recent surveys based on cosmic chronometers, the Pantheon data set, and baryonic acoustic oscillation data. We also assess the consistency of these models and data set combinations with two important priors on the Hubble constant coming from t... |
1410.6636 | Luis Herrera | L. Herrera, A. Di Prisco, W. Barreto, J. Ospino | Conformally flat polytropes for anisotropic matter | 9 pages Revtex-4, 6 figures. To appear in Gen. Rel. Grav. Some typos
corrected | Gen. Rel. Grav. 46,1827, (2014) | 10.1007/s10714-014-1827-7 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze in detail conformally flat spherically symmetric fluid
distributions, satisfying a polytropic equation of state. Among the two
possible families of relativistic polytropes, only one contains models which
satisfy all the required physical conditions. The ensuing configurations are
necessarily anisotropic an... | [
{
"created": "Fri, 24 Oct 2014 10:09:54 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Nov 2014 12:26:28 GMT",
"version": "v2"
}
] | 2014-11-06 | [
[
"Herrera",
"L.",
""
],
[
"Di Prisco",
"A.",
""
],
[
"Barreto",
"W.",
""
],
[
"Ospino",
"J.",
""
]
] | We analyze in detail conformally flat spherically symmetric fluid distributions, satisfying a polytropic equation of state. Among the two possible families of relativistic polytropes, only one contains models which satisfy all the required physical conditions. The ensuing configurations are necessarily anisotropic and ... |
1107.0802 | Jose Natario | Joao L. Costa, Artur Alho and Jose Natario | Spherical linear waves in de Sitter spacetime | 9 pages, 1 figure; v2: minor changes, references added, matches final
published version | J. Math. Phys. 53 (2012) 052501 | 10.1063/1.4721644 | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply Christodoulou's framework, developed to study the Einstein-scalar
field equations in spherical symmetry, to the linear wave equation in de Sitter
spacetime, as a first step towards the Einstein-scalar field equations with
positive cosmological constant. We obtain an integro-differential evolution
equation wh... | [
{
"created": "Tue, 5 Jul 2011 07:34:26 GMT",
"version": "v1"
},
{
"created": "Fri, 25 May 2012 17:05:56 GMT",
"version": "v2"
}
] | 2015-05-28 | [
[
"Costa",
"Joao L.",
""
],
[
"Alho",
"Artur",
""
],
[
"Natario",
"Jose",
""
]
] | We apply Christodoulou's framework, developed to study the Einstein-scalar field equations in spherical symmetry, to the linear wave equation in de Sitter spacetime, as a first step towards the Einstein-scalar field equations with positive cosmological constant. We obtain an integro-differential evolution equation whic... |
gr-qc/0701002 | T. Padmanabhan | Dawood Kothawala, Sudipta Sarkar, T. Padmanabhan | Einstein's equations as a thermodynamic identity: The cases of
stationary axisymmetric horizons and evolving spherically symmetric horizons | revtex; 6 pages; no figures | Phys.Lett.B652:338-342,2007 | 10.1016/j.physletb.2007.07.021 | null | gr-qc astro-ph hep-th | null | There is an intriguing analogy between the gravitational dynamics of the
horizons and thermodynamics. In case of general relativity, as well as for a
wider class of Lanczos-Lovelock theories of gravity, it is possible to
interpret the field equations near any spherically symmetric horizon as a
thermodynamic identity ... | [
{
"created": "Sat, 30 Dec 2006 08:20:11 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kothawala",
"Dawood",
""
],
[
"Sarkar",
"Sudipta",
""
],
[
"Padmanabhan",
"T.",
""
]
] | There is an intriguing analogy between the gravitational dynamics of the horizons and thermodynamics. In case of general relativity, as well as for a wider class of Lanczos-Lovelock theories of gravity, it is possible to interpret the field equations near any spherically symmetric horizon as a thermodynamic identity Td... |
1910.02990 | Herbert Hamber | Herbert W. Hamber and Lu Heng Sunny Yu | Gravitational Fluctuations as an Alternative to Inflation II. CMB
Angular Power Spectrum | 43 pages, 8 figures (typos fixed, references added) | Universe 2019, 5(11), 216 | 10.3390/universe5110216 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Power spectra always play an important role in the theory of inflation. In
particular, the ability to reproduce the galaxy matter power spectrum and the
CMB temperature angular power spectrum coefficients to high accuracy is often
considered a triumph of inflation. In our previous work, we presented an
alternative ex... | [
{
"created": "Mon, 7 Oct 2019 18:14:41 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Oct 2019 17:00:20 GMT",
"version": "v2"
}
] | 2019-11-01 | [
[
"Hamber",
"Herbert W.",
""
],
[
"Yu",
"Lu Heng Sunny",
""
]
] | Power spectra always play an important role in the theory of inflation. In particular, the ability to reproduce the galaxy matter power spectrum and the CMB temperature angular power spectrum coefficients to high accuracy is often considered a triumph of inflation. In our previous work, we presented an alternative expl... |
2010.12360 | Diego S\'aez-Chill\'on G\'omez | Sabit Bekov, Kairat Myrzakulov, Ratbay Myrzakulov, Diego
S\'aez-Chill\'on G\'omez | General slow-roll inflation in $f(R)$ gravity under the Palatini
approach | 11 pages, version published | Symmetry 2020, 12(12), 1958 | 10.3390/sym12121958 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Slow-roll inflation is analyzed in the context of modified gravity within the
Palatini formalism. As shown in the literature, inflation in this framework
requires the presence of non-traceless matter, otherwise it does not occur just
as a consequence of the non-linear gravitational terms of the action.
Nevertheless, ... | [
{
"created": "Thu, 22 Oct 2020 17:00:13 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Nov 2020 16:53:58 GMT",
"version": "v2"
}
] | 2020-11-30 | [
[
"Bekov",
"Sabit",
""
],
[
"Myrzakulov",
"Kairat",
""
],
[
"Myrzakulov",
"Ratbay",
""
],
[
"Gómez",
"Diego Sáez-Chillón",
""
]
] | Slow-roll inflation is analyzed in the context of modified gravity within the Palatini formalism. As shown in the literature, inflation in this framework requires the presence of non-traceless matter, otherwise it does not occur just as a consequence of the non-linear gravitational terms of the action. Nevertheless, by... |
gr-qc/0409017 | Bahram Mashhoon | C. Chicone and B. Mashhoon | Ultrarelativistic Motion: Inertial and Tidal Effects in Fermi
Coordinates | 13 pages, 3 figures, slightly expanded version accepted for
publication in Class. Quantum Grav | Class.Quant.Grav. 22 (2005) 195-206 | 10.1088/0264-9381/22/1/013 | null | gr-qc astro-ph | null | Fermi coordinates are the natural generalization of inertial Cartesian
coordinates to accelerated systems and gravitational fields. We study the
motion of ultrarelativistic particles and light rays in Fermi coordinates and
investigate inertial and tidal effects beyond the critical speed c/sqrt(2). In
particular, we d... | [
{
"created": "Sat, 4 Sep 2004 02:22:13 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Nov 2004 19:43:16 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Chicone",
"C.",
""
],
[
"Mashhoon",
"B.",
""
]
] | Fermi coordinates are the natural generalization of inertial Cartesian coordinates to accelerated systems and gravitational fields. We study the motion of ultrarelativistic particles and light rays in Fermi coordinates and investigate inertial and tidal effects beyond the critical speed c/sqrt(2). In particular, we dis... |
2006.12266 | Ranjan Sharma | S. Thirukkanesh, Ranjan Sharma and Sunil D. Maharaj | Anisotropic generalization of Vaidya-Tikekar superdense star | null | Eur. Phys. J. Plus (2019) 134:378 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study superdense relativistic stars with anisotropic matter distributions
with spheroidal spatial hypersurfaces. We propose a methodology to make an
anisotropic generalization of the Vaidya-Tikekar superdense star model. The
anisotropic Einstein field equations can be solved in terms of hypergeometric
functions fo... | [
{
"created": "Fri, 19 Jun 2020 05:53:44 GMT",
"version": "v1"
}
] | 2020-06-23 | [
[
"Thirukkanesh",
"S.",
""
],
[
"Sharma",
"Ranjan",
""
],
[
"Maharaj",
"Sunil D.",
""
]
] | We study superdense relativistic stars with anisotropic matter distributions with spheroidal spatial hypersurfaces. We propose a methodology to make an anisotropic generalization of the Vaidya-Tikekar superdense star model. The anisotropic Einstein field equations can be solved in terms of hypergeometric functions for ... |
1401.6940 | Giampiero Esposito Dr. | Enrico Calloni, Martina De Laurentis, Rosario De Rosa, Luciano Di
Fiore, Giampiero Esposito, Fabio Garufi, Luigi Rosa, Carlo Rovelli, Paolo
Ruggi, Francesco Tafuri | Towards weighing the condensation energy to ascertain the Archimedes
force of vacuum | Revtex, 33 pages, 8 figures. In the final version, the title has been
changed, and all sections have been improved, while 2 appendices have been
added | null | 10.1103/PhysRevD.90.022002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The force exerted by the gravitational field on a Casimir cavity in terms of
Archimedes force of vacuum is discussed, the force that can be tested against
observation is identified, and it is shown that the present technology makes it
possible to perform the first experimental tests. The use of suitable high-Tc
super... | [
{
"created": "Mon, 27 Jan 2014 17:30:03 GMT",
"version": "v1"
},
{
"created": "Sun, 22 Jun 2014 20:47:15 GMT",
"version": "v2"
}
] | 2015-06-18 | [
[
"Calloni",
"Enrico",
""
],
[
"De Laurentis",
"Martina",
""
],
[
"De Rosa",
"Rosario",
""
],
[
"Di Fiore",
"Luciano",
""
],
[
"Esposito",
"Giampiero",
""
],
[
"Garufi",
"Fabio",
""
],
[
"Rosa",
"Luigi",
""
... | The force exerted by the gravitational field on a Casimir cavity in terms of Archimedes force of vacuum is discussed, the force that can be tested against observation is identified, and it is shown that the present technology makes it possible to perform the first experimental tests. The use of suitable high-Tc superco... |
1709.09514 | Bertrand Berche | Frankbelson dos S. Azevedo, Fernando Moraes, Francisco Mireles,
Bertrand Berche, S\'ebastien Fumeron | The wiggly cosmic string as a waveguide for massless and massive fields | null | null | 10.1103/PhysRevD.96.084047 | null | gr-qc cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the effect of a wiggly cosmic string for both massless and massive
particle propagation along the string axis. We show that the wave equation that
governs the propagation of a scalar field in the neighborhood of a wiggly
string is formally equivalent to the quantum wave equation describing the
hydrogen ato... | [
{
"created": "Wed, 27 Sep 2017 13:46:30 GMT",
"version": "v1"
}
] | 2017-11-22 | [
[
"Azevedo",
"Frankbelson dos S.",
""
],
[
"Moraes",
"Fernando",
""
],
[
"Mireles",
"Francisco",
""
],
[
"Berche",
"Bertrand",
""
],
[
"Fumeron",
"Sébastien",
""
]
] | We examine the effect of a wiggly cosmic string for both massless and massive particle propagation along the string axis. We show that the wave equation that governs the propagation of a scalar field in the neighborhood of a wiggly string is formally equivalent to the quantum wave equation describing the hydrogen atom ... |
1012.0077 | Fethi M. Ramazanoglu | Abhay Ashtekar, Frans Pretorius, Fethi M. Ramazano\u{g}lu | Evaporation of 2-Dimensional Black Holes | Two citations added | Phys.Rev.D83:044040,2011 | 10.1103/PhysRevD.83.044040 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a detailed analysis of results from a new study of the quantum
evaporation of Callan-Giddings-Harvey-Strominger (CGHS) black holes within the
mean-field approximation. This semi-classical theory incorporates back
reaction. Our analytical and numerical calculations show that, while some of
the assumptions u... | [
{
"created": "Wed, 1 Dec 2010 01:24:26 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Mar 2011 00:08:09 GMT",
"version": "v2"
}
] | 2011-03-23 | [
[
"Ashtekar",
"Abhay",
""
],
[
"Pretorius",
"Frans",
""
],
[
"Ramazanoğlu",
"Fethi M.",
""
]
] | We present a detailed analysis of results from a new study of the quantum evaporation of Callan-Giddings-Harvey-Strominger (CGHS) black holes within the mean-field approximation. This semi-classical theory incorporates back reaction. Our analytical and numerical calculations show that, while some of the assumptions und... |
1201.1069 | Vladimir Dzhunushaliev | Vladimir Dzhunushaliev | Dynamical $F(R)$ gravities | discussion on quantum corrections is added | null | 10.1142/S0218271812500423 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is offered that $F(R)-$modified gravities can be considered as
nonperturbative quantum effects arising from Einstein gravity. It is assumed
that nonperturbative quantum effects gives rise to the fact that the connection
becomes incompatible with the metric, the metric factors and the square of the
connection in Ei... | [
{
"created": "Thu, 5 Jan 2012 06:45:05 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Mar 2012 07:48:17 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Dzhunushaliev",
"Vladimir",
""
]
] | It is offered that $F(R)-$modified gravities can be considered as nonperturbative quantum effects arising from Einstein gravity. It is assumed that nonperturbative quantum effects gives rise to the fact that the connection becomes incompatible with the metric, the metric factors and the square of the connection in Eins... |
2103.13714 | Hiroki Asami | Hiroki Asami and Chul-Moon Yoo | Thermal equilibrium states and instability of self-gravitating particles
in an asymptotically AdS spacetime | 12 pages | null | 10.1088/1361-6382/ac129e | null | gr-qc hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | We investigate the existence and the stability of spherically symmetric
thermal equilibrium states of the self-gravitating many-particle system which
satisfies the Einstein-Vlasov equations with a negative cosmological constant.
While a thermal equilibrium state of the self-gravitating particle system
cannot have a f... | [
{
"created": "Thu, 25 Mar 2021 09:42:46 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Apr 2021 07:36:49 GMT",
"version": "v2"
},
{
"created": "Thu, 10 Jun 2021 05:10:41 GMT",
"version": "v3"
},
{
"created": "Tue, 29 Jun 2021 12:19:01 GMT",
"version": "v4"
}
] | 2021-08-17 | [
[
"Asami",
"Hiroki",
""
],
[
"Yoo",
"Chul-Moon",
""
]
] | We investigate the existence and the stability of spherically symmetric thermal equilibrium states of the self-gravitating many-particle system which satisfies the Einstein-Vlasov equations with a negative cosmological constant. While a thermal equilibrium state of the self-gravitating particle system cannot have a fin... |
gr-qc/0009018 | Luca Bombelli | Brett Bolen, Luca Bombelli, and Raymond Puzio | Expansion-induced contribution to the precession of binary orbits | revtex, 7 pages, no figures; revised for publication in Classical and
Quantum Gravity, with minor changes in response to referees' comments | Class.Quant.Grav.18:1173-1178,2001 | 10.1088/0264-9381/18/7/302 | null | gr-qc astro-ph | null | We point out the existence of new effects of global spacetime expansion on
local binary systems. In addition to a possible change of orbital size, there
is a contribution to the precession of elliptic orbits, to be added to the
well-known general relativistic effect in static spacetimes, and the
eccentricity can chan... | [
{
"created": "Thu, 7 Sep 2000 01:57:56 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Mar 2001 21:27:37 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Bolen",
"Brett",
""
],
[
"Bombelli",
"Luca",
""
],
[
"Puzio",
"Raymond",
""
]
] | We point out the existence of new effects of global spacetime expansion on local binary systems. In addition to a possible change of orbital size, there is a contribution to the precession of elliptic orbits, to be added to the well-known general relativistic effect in static spacetimes, and the eccentricity can change... |
gr-qc/0404003 | Hernando Quevedo | Octavio Obregon, Hernando Quevedo and Michael P. Ryan | Time and "angular" dependent backgrounds from stationary axisymmetric
solutions | 24 pages, 5 figures, corrected typos, references added | Phys.Rev. D70 (2004) 064035 | 10.1103/PhysRevD.70.064035 | null | gr-qc hep-th | null | Backgrounds depending on time and on "angular" variable, namely polarized and
unpolarized $S^1 \times S^2$ Gowdy models, are generated as the sector inside
the horizons of the manifold corresponding to axisymmetric solutions. As is
known, an analytical continuation of ordinary $D$-branes, $iD$-branes allows
one to fi... | [
{
"created": "Thu, 1 Apr 2004 07:14:36 GMT",
"version": "v1"
},
{
"created": "Thu, 20 May 2004 02:31:59 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Obregon",
"Octavio",
""
],
[
"Quevedo",
"Hernando",
""
],
[
"Ryan",
"Michael P.",
""
]
] | Backgrounds depending on time and on "angular" variable, namely polarized and unpolarized $S^1 \times S^2$ Gowdy models, are generated as the sector inside the horizons of the manifold corresponding to axisymmetric solutions. As is known, an analytical continuation of ordinary $D$-branes, $iD$-branes allows one to find... |
1403.4549 | Michael Holst | Michael Holst and Caleb Meier | Non-CMC Solutions to the Einstein Constraint Equations on Asymptotically
Euclidean Manifolds with Apparent Horizon Boundaries | 25 pages, no figures | null | 10.1088/0264-9381/32/2/025006 | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we further develop the solution theory for the Einstein
constraint equations on an n-dimensional, asymptotically Euclidean manifold M
with interior boundary S. Building on recent results for both the
asymptotically Euclidean and compact with boundary settings, we show existence
of far-from-CMC and nea... | [
{
"created": "Tue, 18 Mar 2014 17:42:43 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Holst",
"Michael",
""
],
[
"Meier",
"Caleb",
""
]
] | In this article we further develop the solution theory for the Einstein constraint equations on an n-dimensional, asymptotically Euclidean manifold M with interior boundary S. Building on recent results for both the asymptotically Euclidean and compact with boundary settings, we show existence of far-from-CMC and near-... |
2111.07873 | Maciej Kolanowski | Abhay Ashtekar, Neev Khera, Maciej Kolanowski and Jerzy Lewandowski | Non-Expanding horizons: Multipoles and the Symmetry Group | 31 pages, 2 figures. Some clarifications and references added.
Published in JHEP. Typos corrected in Section 2.2 and 2.3.1 | JHEP 01 028 (2022) | 10.1007/JHEP01(2022)028 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well-known that blackhole and cosmological horizons in equilibrium
situations are well-modeled by non-expanding horizons (NEHs). In the first part
of the paper we introduce multipole moments to characterize their geometry,
removing the restriction to axisymmetric situations made in the existing
literature. We t... | [
{
"created": "Mon, 15 Nov 2021 16:23:32 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Dec 2021 20:06:04 GMT",
"version": "v2"
},
{
"created": "Mon, 4 Jul 2022 17:45:32 GMT",
"version": "v3"
}
] | 2022-07-05 | [
[
"Ashtekar",
"Abhay",
""
],
[
"Khera",
"Neev",
""
],
[
"Kolanowski",
"Maciej",
""
],
[
"Lewandowski",
"Jerzy",
""
]
] | It is well-known that blackhole and cosmological horizons in equilibrium situations are well-modeled by non-expanding horizons (NEHs). In the first part of the paper we introduce multipole moments to characterize their geometry, removing the restriction to axisymmetric situations made in the existing literature. We the... |
2007.05182 | B. S. Ratanpal | B. S. Ratanpal, V. O Thomas and Rinkal Patel | Compact Relativistic Stars under Karmarkar Condition | 9 Figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A class of new solutions for Einstein's field equations, by choosing the
ansatz $e^{\lambda(r)}=\frac{1+ar^{2}}{1+br^{2}}$ for metric potential, are
obtained under Karmarkar condition. It is found that a number of pulsars like
4U 1820-30, PSR J1903+327, 4U 1608-52, Vela X-1, PSR J1614-2230, Cen X-3 can be
accomodated... | [
{
"created": "Fri, 10 Jul 2020 06:02:19 GMT",
"version": "v1"
}
] | 2020-07-13 | [
[
"Ratanpal",
"B. S.",
""
],
[
"Thomas",
"V. O",
""
],
[
"Patel",
"Rinkal",
""
]
] | A class of new solutions for Einstein's field equations, by choosing the ansatz $e^{\lambda(r)}=\frac{1+ar^{2}}{1+br^{2}}$ for metric potential, are obtained under Karmarkar condition. It is found that a number of pulsars like 4U 1820-30, PSR J1903+327, 4U 1608-52, Vela X-1, PSR J1614-2230, Cen X-3 can be accomodated i... |
1812.03000 | Jorge Ovalle | J Ovalle | Decoupling gravitational sources in general relativity: the extended
case | 7 pages | Phys.Lett. B788 (2019) 213-218 | 10.1016/j.physletb.2018.11.029 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show how to decoupling two spherically symmetric and static gravitational
sources through the most general possible extension of the so-called Minimal
Geometric Deformation-decoupling. As a test, we decouple the Einstein-Maxwell
system and reproduce the Reissner-Nordstrom black hole solution. We show the
potential... | [
{
"created": "Fri, 7 Dec 2018 12:25:51 GMT",
"version": "v1"
}
] | 2018-12-10 | [
[
"Ovalle",
"J",
""
]
] | We show how to decoupling two spherically symmetric and static gravitational sources through the most general possible extension of the so-called Minimal Geometric Deformation-decoupling. As a test, we decouple the Einstein-Maxwell system and reproduce the Reissner-Nordstrom black hole solution. We show the potential o... |
gr-qc/9801014 | B. S. Sathyaprakash | T. Damour(Institut des Hautes Etudes Scientifiques), B.R. Iyer (Raman
Research Institute) and B.S. Sathyaprakash (Cardiff University of Wales) | Modelling Gravitational Waves from Inspiralling Compact Binaries | Needs sprocl.sty which is bundled together with the tex file. To
appear in the proceedings "Second Edoardo Amaldi Conference on Gravitational
Waves", CERN, 1 - 4 July 1997 | null | null | null | gr-qc | null | Gravitational waves from inspiralling compact binaries can be reliably
extracted from a noisy detector output only if the template used in the
detection is a faithful representation of the true signal. In this article we
suggest a new approach to constructing faithful signal models.
| [
{
"created": "Wed, 7 Jan 1998 17:08:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Damour",
"T.",
"",
"Institut des Hautes Etudes Scientifiques"
],
[
"Iyer",
"B. R.",
"",
"Raman\n Research Institute"
],
[
"Sathyaprakash",
"B. S.",
"",
"Cardiff University of Wales"
]
] | Gravitational waves from inspiralling compact binaries can be reliably extracted from a noisy detector output only if the template used in the detection is a faithful representation of the true signal. In this article we suggest a new approach to constructing faithful signal models. |
1308.0010 | Robert Schneider | Stefan Hofmann, Florian Niedermann, Robert Schneider | Interpretation of the Weyl tensor | 12 pages, 2 figures; v2: matches version published in Physical Review
D | Phys. Rev. D 88, 064047 (2013) | 10.1103/PhysRevD.88.064047 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | According to folklore in general relativity, the Weyl tensor can be
decomposed into parts corresponding to Newton-like, incoming and outgoing
wavelike field components. It is shown here that this one-to-one correspondence
does not hold for space-time geometries with cylindrical isometries. This is
done by investigati... | [
{
"created": "Wed, 31 Jul 2013 20:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Oct 2013 12:25:49 GMT",
"version": "v2"
}
] | 2013-10-25 | [
[
"Hofmann",
"Stefan",
""
],
[
"Niedermann",
"Florian",
""
],
[
"Schneider",
"Robert",
""
]
] | According to folklore in general relativity, the Weyl tensor can be decomposed into parts corresponding to Newton-like, incoming and outgoing wavelike field components. It is shown here that this one-to-one correspondence does not hold for space-time geometries with cylindrical isometries. This is done by investigating... |
1311.0537 | Oleg Zaslavskii | O. B. Zaslavskii | High-energy collisions inside black holes and their counterpart in flat
space-time | 15 pages, 2 figures. Presentation improved. To appear in IJMP D | Int. Journal of Mod. Physics D 23 (2014) 1450045 | 10.1142/S021827181450045X | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Two particles can collide inside a nonextremal black hole in such a way that
the energy E_{c.m.} in their centre of mass frame becomes as large as one
likes. We show that this effect can be understood with the help of a simple
analogy with particle collisions in flat space-time. As the two-dimensional
part of near-ho... | [
{
"created": "Sun, 3 Nov 2013 22:19:23 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Mar 2014 11:59:23 GMT",
"version": "v2"
}
] | 2014-04-01 | [
[
"Zaslavskii",
"O. B.",
""
]
] | Two particles can collide inside a nonextremal black hole in such a way that the energy E_{c.m.} in their centre of mass frame becomes as large as one likes. We show that this effect can be understood with the help of a simple analogy with particle collisions in flat space-time. As the two-dimensional part of near-hori... |
1411.2317 | Miguel Angel Garcia Aspeitia | Aldrin Cervantes and Miguel A. Garc\'ia-Aspeitia | Numerical Prediction of cusps or kinks in the Nambu-Goto dynamics | 17 pages, 4 figures. Accepted for Publication in Mod. Phys. Lett. A | null | 10.1142/S0217732315502107 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is known that Nambu-Goto extended objects present some pathological
structures, such as cusps and kinks, during their evolution. In this paper, we
propose a model through the generalized Raychaudhuri equation [Rh] for
membranes to determine if there are cusps and kinks in the world-sheet. We
extend the generalized... | [
{
"created": "Mon, 10 Nov 2014 03:54:04 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Sep 2015 13:45:38 GMT",
"version": "v2"
}
] | 2015-12-16 | [
[
"Cervantes",
"Aldrin",
""
],
[
"García-Aspeitia",
"Miguel A.",
""
]
] | It is known that Nambu-Goto extended objects present some pathological structures, such as cusps and kinks, during their evolution. In this paper, we propose a model through the generalized Raychaudhuri equation [Rh] for membranes to determine if there are cusps and kinks in the world-sheet. We extend the generalized R... |
0707.3969 | Nelson Christensen | Christian R\"over, Alexander Stroeer, Ed Bloomer, Nelson Christensen,
James Clark, Martin Hendry, Chris Messenger, Renate Meyer, Matt Pitkin,
Jennifer Toher, Richard Umst\"atter, Alberto Vecchio, John Veitch, Graham
Woan | Inference on inspiral signals using LISA MLDC data | Accepted for publication in Classical and Quantum Gravity, GWDAW-11
special issue | Class.Quant.Grav.24:S521-S528,2007 | 10.1088/0264-9381/24/19/S15 | null | gr-qc | null | In this paper we describe a Bayesian inference framework for analysis of data
obtained by LISA. We set up a model for binary inspiral signals as defined for
the Mock LISA Data Challenge 1.2 (MLDC), and implemented a Markov chain Monte
Carlo (MCMC) algorithm to facilitate exploration and integration of the
posterior d... | [
{
"created": "Thu, 26 Jul 2007 17:30:21 GMT",
"version": "v1"
},
{
"created": "Sun, 5 Aug 2007 14:17:08 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Röver",
"Christian",
""
],
[
"Stroeer",
"Alexander",
""
],
[
"Bloomer",
"Ed",
""
],
[
"Christensen",
"Nelson",
""
],
[
"Clark",
"James",
""
],
[
"Hendry",
"Martin",
""
],
[
"Messenger",
"Chris",
""
],
... | In this paper we describe a Bayesian inference framework for analysis of data obtained by LISA. We set up a model for binary inspiral signals as defined for the Mock LISA Data Challenge 1.2 (MLDC), and implemented a Markov chain Monte Carlo (MCMC) algorithm to facilitate exploration and integration of the posterior dis... |
2105.10696 | Abhik Kumar Sanyal Dr. | A. Banerjee, Abhik Kumar Sanyal and S. Chakraborty | Bianchi II, VIII, and IX viscous fluid cosmology | 7 pages, 0 figures | Astrophysics and Space Science 166: 259-268, 1990 | 10.1007/BF01094897 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the exact solutions for a viscous fluid distribution
in Bianchi II, VIII, and IX models. The metric is simplified by assuming a
relationship between the coefficients and the metric tensor. Solutions are
obtained in two special cases: in one, an additional assumption is made where
the matter den... | [
{
"created": "Sat, 22 May 2021 11:31:23 GMT",
"version": "v1"
}
] | 2021-05-25 | [
[
"Banerjee",
"A.",
""
],
[
"Sanyal",
"Abhik Kumar",
""
],
[
"Chakraborty",
"S.",
""
]
] | In this paper we study the exact solutions for a viscous fluid distribution in Bianchi II, VIII, and IX models. The metric is simplified by assuming a relationship between the coefficients and the metric tensor. Solutions are obtained in two special cases: in one, an additional assumption is made where the matter densi... |
2402.05316 | Macarena Lagos | Macarena Lagos, Leah Jenks, Maximiliano Isi, Kenta Hotokezaka, Brian
D. Metzger, Eric Burns, Will M. Farr, Scott Perkins, Kaze W. K. Wong, Nicolas
Yunes | Birefringence tests of gravity with multi-messenger binaries | null | null | null | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Extensions to General Relativity (GR) allow the polarization of gravitational
waves (GW) from astrophysical sources to suffer from amplitude and velocity
birefringence, which respectively induce changes in the ellipticity and
orientation of the polarization tensor. We introduce a multi-messenger approach
to test this... | [
{
"created": "Wed, 7 Feb 2024 23:38:27 GMT",
"version": "v1"
}
] | 2024-02-09 | [
[
"Lagos",
"Macarena",
""
],
[
"Jenks",
"Leah",
""
],
[
"Isi",
"Maximiliano",
""
],
[
"Hotokezaka",
"Kenta",
""
],
[
"Metzger",
"Brian D.",
""
],
[
"Burns",
"Eric",
""
],
[
"Farr",
"Will M.",
""
],
[
... | Extensions to General Relativity (GR) allow the polarization of gravitational waves (GW) from astrophysical sources to suffer from amplitude and velocity birefringence, which respectively induce changes in the ellipticity and orientation of the polarization tensor. We introduce a multi-messenger approach to test this p... |
gr-qc/0211004 | Allan Joseph Medved | A.J.M. Medved (University of Alberta) | Horizon Dynamics of a BTZ Black Hole | 13 pages and now in Revtex; some discussion and references added | Class.Quant.Grav. 20 (2003) 3165-3174 | 10.1088/0264-9381/20/14/317 | null | gr-qc hep-th | null | It has been suggested in the literature that, given a black hole spacetime, a
relativistic membrane can provide an effective description of the horizon
dynamics. In this paper, we explore such a framework in the context of a
2+1-dimensional BTZ black hole. Following this membrane prescription, we are
able to translat... | [
{
"created": "Fri, 1 Nov 2002 16:14:24 GMT",
"version": "v1"
},
{
"created": "Mon, 12 May 2003 15:22:25 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Medved",
"A. J. M.",
"",
"University of Alberta"
]
] | It has been suggested in the literature that, given a black hole spacetime, a relativistic membrane can provide an effective description of the horizon dynamics. In this paper, we explore such a framework in the context of a 2+1-dimensional BTZ black hole. Following this membrane prescription, we are able to translate ... |
2009.11823 | Ryotaku Suzuki | Ryotaku Suzuki | Black hole interactions at large $D$: brane blobology | 41 pages, 13 figures; v2: minor modifications; v3: published version,
title changed, figures added, 43 pages, 17 figures | JHEP 02 (2021) 131 | 10.1007/JHEP02(2021)131 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the large dimension ($D$) limit, Einstein's equation reduces to an
effective theory on the horizon surface, drastically simplifying the black hole
analysis. Especially, the effective theory on the black brane has been
successful in describing the non-linear dynamics not only of black branes, but
also of compact bl... | [
{
"created": "Thu, 24 Sep 2020 17:02:45 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Oct 2020 16:37:07 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Feb 2021 11:17:08 GMT",
"version": "v3"
}
] | 2021-02-17 | [
[
"Suzuki",
"Ryotaku",
""
]
] | In the large dimension ($D$) limit, Einstein's equation reduces to an effective theory on the horizon surface, drastically simplifying the black hole analysis. Especially, the effective theory on the black brane has been successful in describing the non-linear dynamics not only of black branes, but also of compact blac... |
2207.08397 | Shao-Wen Wei | Shao-Wen Wei, Yu-Xiao Liu | Topology of equatorial timelike circular orbits around stationary black
holes | 20 pages, 10 figures | Phys. Rev. D 107, 064006 (2023) | 10.1103/PhysRevD.107.064006 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | A topological approach has been successfully used to study the properties of
the light ring and the null circular orbit, in a generic black hole background.
However, for the equatorial timelike circular orbit, quite different from the
light ring case, its radius is closely dependent of the energy and angular
momentum... | [
{
"created": "Mon, 18 Jul 2022 06:14:36 GMT",
"version": "v1"
},
{
"created": "Sat, 11 Mar 2023 09:13:23 GMT",
"version": "v2"
}
] | 2023-03-14 | [
[
"Wei",
"Shao-Wen",
""
],
[
"Liu",
"Yu-Xiao",
""
]
] | A topological approach has been successfully used to study the properties of the light ring and the null circular orbit, in a generic black hole background. However, for the equatorial timelike circular orbit, quite different from the light ring case, its radius is closely dependent of the energy and angular momentum o... |
1204.2778 | John Morris | John D. Anderson and J.R. Morris | Chameleon effect and the Pioneer anomaly | 16 pages; to appear in Phys.Rev.D | Phys.Rev.D 85, 084017 (2012) | 10.1103/PhysRevD.85.084017 | null | gr-qc astro-ph.EP hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The possibility that the apparent anomalous acceleration of the Pioneer 10
and 11 spacecraft may be due, at least in part, to a chameleon field effect is
examined. A small spacecraft, with no thin shell, can have a more pronounced
anomalous acceleration than a large compact body, such as a planet, having a
thin shell... | [
{
"created": "Thu, 12 Apr 2012 17:28:43 GMT",
"version": "v1"
}
] | 2012-07-24 | [
[
"Anderson",
"John D.",
""
],
[
"Morris",
"J. R.",
""
]
] | The possibility that the apparent anomalous acceleration of the Pioneer 10 and 11 spacecraft may be due, at least in part, to a chameleon field effect is examined. A small spacecraft, with no thin shell, can have a more pronounced anomalous acceleration than a large compact body, such as a planet, having a thin shell. ... |
gr-qc/9506043 | Kiyoshi Ezawa | Kiyoshi Ezawa | Combinatorial solutions to the Hamiltonian constraint in
(2+1)-dimensional Ashtekar gravity | 41 pages Latex (2 figures available as a postscript file) | Nucl.Phys. B459 (1996) 355-392 | 10.1016/0550-3213(95)00557-9 | OU-HET/217 | gr-qc | null | Dirac's quantization of the (2+1)-dimensional analog of Ashtekar's approach
to quantum gravity is investigated. After providing a diffeomorphism-invariant
regularization of the Hamiltonian constraint, we find a set of solutions to
this Hamiltonian constraint which is a generalization of the solution
discovered by Jac... | [
{
"created": "Thu, 22 Jun 1995 07:56:08 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Jun 1995 13:19:10 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Ezawa",
"Kiyoshi",
""
]
] | Dirac's quantization of the (2+1)-dimensional analog of Ashtekar's approach to quantum gravity is investigated. After providing a diffeomorphism-invariant regularization of the Hamiltonian constraint, we find a set of solutions to this Hamiltonian constraint which is a generalization of the solution discovered by Jacob... |
gr-qc/9802047 | Aroon Beesham | Aroonkumar Beesham (University of Zululand, S. Africa) | Physical interpretation of constants in the solutions to the Brans-Dicke
equations | 10 pages, RevTex | Mod.Phys.Lett.A13:805-810,1998 | 10.1142/S0217732398000863 | null | gr-qc | null | Using an energy-momentum complex we give a physical interpretation to the
constants in the well-known static spherically symmetric asymptotically flat
vacuum solution to the Brans-Dicke equations. The positivity of the tensor mass
puts a bound on parameters in the solution.
| [
{
"created": "Wed, 18 Feb 1998 08:49:58 GMT",
"version": "v1"
}
] | 2010-03-03 | [
[
"Beesham",
"Aroonkumar",
"",
"University of Zululand, S. Africa"
]
] | Using an energy-momentum complex we give a physical interpretation to the constants in the well-known static spherically symmetric asymptotically flat vacuum solution to the Brans-Dicke equations. The positivity of the tensor mass puts a bound on parameters in the solution. |
0801.4401 | Francisco Lobo | Francisco S. N. Lobo | General class of wormhole geometries in conformal Weyl gravity | 7 pages, Revtex4. V2: typos corrected. V3: 8 pages, section on the
energy conditions added, version to appear in Class. Quant. Gravity | Class.Quant.Grav.25:175006,2008 | 10.1088/0264-9381/25/17/175006 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, a general class of wormhole geometries in conformal Weyl
gravity is analyzed. A wide variety of exact solutions of asymptotically flat
spacetimes is found, in which the stress energy tensor profile differs
radically from its general relativistic counterpart. In particular, a class of
geometries is const... | [
{
"created": "Tue, 29 Jan 2008 12:43:51 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Feb 2008 14:25:59 GMT",
"version": "v2"
},
{
"created": "Fri, 4 Jul 2008 16:00:40 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Lobo",
"Francisco S. N.",
""
]
] | In this work, a general class of wormhole geometries in conformal Weyl gravity is analyzed. A wide variety of exact solutions of asymptotically flat spacetimes is found, in which the stress energy tensor profile differs radically from its general relativistic counterpart. In particular, a class of geometries is constru... |
gr-qc/9908014 | Parthasarathi Mitra | P. Mitra | A note on the entropy of charged multi - black - holes | LaTeX, 8 pages | Phys.Rev. D61 (2000) 024028 | 10.1103/PhysRevD.61.024028 | SINP/TNP/99-26 | gr-qc hep-th | null | Majumdar--Papapetrou multi--black-hole solutions of the Einstein--Maxwell
equations are considered in four and higher dimensions. The Euclidean action
with boundary conditions appropriate to the canonical ensemble is shown to lead
to zero entropy.
| [
{
"created": "Thu, 5 Aug 1999 10:26:05 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Mitra",
"P.",
""
]
] | Majumdar--Papapetrou multi--black-hole solutions of the Einstein--Maxwell equations are considered in four and higher dimensions. The Euclidean action with boundary conditions appropriate to the canonical ensemble is shown to lead to zero entropy. |
1307.6525 | Neil Ashby | Neil Ashby, Marc Weiss | Why there is no noon-midnight red shift in the GPS | null | null | null | null | gr-qc | http://creativecommons.org/licenses/publicdomain/ | Although the effects of solar (and lunar) gravitational potentials on the
frequencies of orbiting Global Positioning System (GPS) clocks are actually no
more than a few parts in 10^(15), a na\"ive calculation appears to show that
such effects are much larger, and depend on whether the orbiting clock is
between the ea... | [
{
"created": "Wed, 24 Jul 2013 18:42:10 GMT",
"version": "v1"
}
] | 2013-07-25 | [
[
"Ashby",
"Neil",
""
],
[
"Weiss",
"Marc",
""
]
] | Although the effects of solar (and lunar) gravitational potentials on the frequencies of orbiting Global Positioning System (GPS) clocks are actually no more than a few parts in 10^(15), a na\"ive calculation appears to show that such effects are much larger, and depend on whether the orbiting clock is between the eart... |
1301.1538 | Sean Gryb B | Sean Gryb and Flavio Mercati | Right about time? | 12 pages, 2 figures. Only author affiliations and emails added. This
essay received fourth prize in the juried FQXi essay competition of 2012 | Questioning the Foundations of Physics. The Frontiers Collection.
pp 87-102. Springer, 2015 | 10.1007/978-3-319-13045-3_6 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Have our fundamental theories got time right? Does size really matter? Or is
physics all in the eyes of the beholder? In this essay, we question the origin
of time and scale by reevaluating the nature of measurement. We then argue for
a radical scenario, supported by a suggestive calculation, where the flow of
time i... | [
{
"created": "Tue, 8 Jan 2013 14:07:24 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Jan 2013 16:54:12 GMT",
"version": "v2"
}
] | 2015-02-06 | [
[
"Gryb",
"Sean",
""
],
[
"Mercati",
"Flavio",
""
]
] | Have our fundamental theories got time right? Does size really matter? Or is physics all in the eyes of the beholder? In this essay, we question the origin of time and scale by reevaluating the nature of measurement. We then argue for a radical scenario, supported by a suggestive calculation, where the flow of time is ... |
2301.09332 | Vladimir S. Manko | H. Garc\'ia-Compe\'an, V. S. Manko, C. J. Ram\'irez-Valdez | Dyonic black holes: The theory of two electromagnetic potentials. II | 14 pages, no figures | null | 10.1103/PhysRevD.107.064017 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The results obtained in our previous paper are now extended to the case of
stationary axially symmetric dyonic black boles within the theory of two
electromagnetic potentials. We slightly enlarge the classical Ernst formalism
by introducing, with the aid of the $t$- and $\varphi$-components of the dual
potential $B_\... | [
{
"created": "Mon, 23 Jan 2023 09:19:56 GMT",
"version": "v1"
}
] | 2023-03-29 | [
[
"García-Compeán",
"H.",
""
],
[
"Manko",
"V. S.",
""
],
[
"Ramírez-Valdez",
"C. J.",
""
]
] | The results obtained in our previous paper are now extended to the case of stationary axially symmetric dyonic black boles within the theory of two electromagnetic potentials. We slightly enlarge the classical Ernst formalism by introducing, with the aid of the $t$- and $\varphi$-components of the dual potential $B_\mu... |
1608.05958 | Seyed Meraj Mousavi Rasouli | S. M. M. Rasouli, A. H. Ziaie, S. Jalalzadeh and P. V. Moniz | Non-singular Brans-Dicke collapse in deformed phase space | 23 pages, 10 figures | Annals of Physics 375(2016)154 | 10.1016/j.aop.2016.09.007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the collapse process of a homogeneous perfect fluid (in FLRW
background) with a barotropic equation of state in Brans-Dicke (BD) theory in
the presence of phase space deformation effects. Such a deformation is
introduced as a particular type of non-commutativity between phase space
coordinates. For the commu... | [
{
"created": "Sun, 21 Aug 2016 15:47:13 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Oct 2016 23:31:04 GMT",
"version": "v2"
}
] | 2016-10-25 | [
[
"Rasouli",
"S. M. M.",
""
],
[
"Ziaie",
"A. H.",
""
],
[
"Jalalzadeh",
"S.",
""
],
[
"Moniz",
"P. V.",
""
]
] | We study the collapse process of a homogeneous perfect fluid (in FLRW background) with a barotropic equation of state in Brans-Dicke (BD) theory in the presence of phase space deformation effects. Such a deformation is introduced as a particular type of non-commutativity between phase space coordinates. For the commuta... |
gr-qc/9411030 | Jim Wheeler | James T. Wheeler | Scale-invariant phase space and the conformal group | 7 pages, plain tex, no figures | null | null | USU-FTG-123 | gr-qc | null | The gauge bundle of the 4-dim conformal group over an 8-dim base space,
called biconformal space, is shown have a consistent interpretation as a
scale-invariant phase space. Specifically, we show that a classical Hamiltonian
system generates a differential geometry which is necessarily biconformal, and
that the class... | [
{
"created": "Fri, 11 Nov 1994 19:18:20 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wheeler",
"James T.",
""
]
] | The gauge bundle of the 4-dim conformal group over an 8-dim base space, called biconformal space, is shown have a consistent interpretation as a scale-invariant phase space. Specifically, we show that a classical Hamiltonian system generates a differential geometry which is necessarily biconformal, and that the classic... |
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