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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2301.06630 | Jocelyn Read | Jocelyn S. Read | Waveform uncertainty quantification and interpretation for
gravitational-wave astronomy | 29 pages, 6 figures, submitted to CQG | null | 10.1088/1361-6382/acd29b | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We demonstrate how to quantify the frequency-domain amplitude and phase
accuracy of waveform models, $\delta A$ and $\delta \phi$, in a form that could
be marginalized over in gravitational-wave inference using techniques currently
applied for quantifying calibration uncertainty. For concreteness, waveform
uncertaint... | [
{
"created": "Mon, 16 Jan 2023 22:55:53 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Apr 2023 18:38:32 GMT",
"version": "v2"
}
] | 2023-06-07 | [
[
"Read",
"Jocelyn S.",
""
]
] | We demonstrate how to quantify the frequency-domain amplitude and phase accuracy of waveform models, $\delta A$ and $\delta \phi$, in a form that could be marginalized over in gravitational-wave inference using techniques currently applied for quantifying calibration uncertainty. For concreteness, waveform uncertaintie... |
1806.09237 | James B. Hartle | Robert Geroch and James B. Hartle | Computability and Physical Theories | 19 pages, a pre arXiv paper posted for accessibility | Foundations of Physics, 16, 533-550, 1986 | null | null | gr-qc math-ph math.MP physics.comp-ph physics.hist-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The familiar theories of physics have the feature that the application of the
theory to make predictions in specific circumstances can be done by means of an
algorithm. We propose a more precise formulation of this feature --- one based
on the issue of whether or not the physically measurable numbers predicted by
the... | [
{
"created": "Mon, 25 Jun 2018 00:01:53 GMT",
"version": "v1"
}
] | 2018-06-26 | [
[
"Geroch",
"Robert",
""
],
[
"Hartle",
"James B.",
""
]
] | The familiar theories of physics have the feature that the application of the theory to make predictions in specific circumstances can be done by means of an algorithm. We propose a more precise formulation of this feature --- one based on the issue of whether or not the physically measurable numbers predicted by the t... |
2108.13489 | Mohammad Akbar | M M Akbar and R Solanki | Generating Spherically Symmetric Static Anisotropic Fluid Solutions of
Einstein's Equations from Hydrostatic Equilibrium | 18 pages. 2 Figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | For static fluid spheres, the condition of hydrostatic equilibrium is given
by the generalized Tolman--Oppenheimer--Volkoff (TOV) equation, a Riccati
equation in the radial pressure. For a perfect fluid source, it is known that
finding a new solution from an existing solution requires solving a Bernoulli
equation, if... | [
{
"created": "Mon, 30 Aug 2021 19:25:22 GMT",
"version": "v1"
}
] | 2021-09-01 | [
[
"Akbar",
"M M",
""
],
[
"Solanki",
"R",
""
]
] | For static fluid spheres, the condition of hydrostatic equilibrium is given by the generalized Tolman--Oppenheimer--Volkoff (TOV) equation, a Riccati equation in the radial pressure. For a perfect fluid source, it is known that finding a new solution from an existing solution requires solving a Bernoulli equation, if t... |
2202.10165 | Muzaffer Adak | Caglar Pala, Ozcan Sert and Muzaffer Adak | Weyl covariance, second clock effect and proper time in theories of
symmetric teleparallel gravity | To appear in EPJC | Eur. Phys. J. C 83 (2023) 17 | 10.1140/epjc/s10052-023-11171-0 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Just after Weyl's paper (Weyl in Gravitation und Elektrizit\"at, Sitzungsber.
Preuss. Akad., Berlin, 1918) Einstein claimed that a gravity model written in a
spacetime geometry with non-metricity suffers from a phenomenon, the so-called
second clock effect. We give a new prescription of parallel transport of a
vector... | [
{
"created": "Mon, 21 Feb 2022 12:22:15 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Mar 2022 14:14:25 GMT",
"version": "v2"
},
{
"created": "Thu, 23 Jun 2022 15:40:44 GMT",
"version": "v3"
},
{
"created": "Tue, 13 Dec 2022 10:30:02 GMT",
"version": "v4"
},
{
"c... | 2023-01-18 | [
[
"Pala",
"Caglar",
""
],
[
"Sert",
"Ozcan",
""
],
[
"Adak",
"Muzaffer",
""
]
] | Just after Weyl's paper (Weyl in Gravitation und Elektrizit\"at, Sitzungsber. Preuss. Akad., Berlin, 1918) Einstein claimed that a gravity model written in a spacetime geometry with non-metricity suffers from a phenomenon, the so-called second clock effect. We give a new prescription of parallel transport of a vector t... |
gr-qc/0009040 | Julio Cesar Fabris | A.B. Batista, J.C. Fabris and S.V.B. Goncalves (Departamento de
Fisica, Universidade Federal do Espirito Santo, Brazil) | On the consistency of a repulsive gravity phase in the early Universe | Latex file, 15 pages, 7 figures. There is a new figure, a new section
and some other minor corrections | Class.Quant.Grav. 18 (2001) 1389 | 10.1088/0264-9381/18/7/319 | null | gr-qc | null | We exploit the possibility of existence of a repulsive gravity phase in the
evolution of the Universe. A toy model with a free scalar field minimally
coupled to gravity, but with the "wrong sign" for the energy and negative
curvature for the spatial section, is studied in detail. The background
solutions display a bo... | [
{
"created": "Tue, 12 Sep 2000 15:09:15 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Feb 2001 14:09:11 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Batista",
"A. B.",
"",
"Departamento de\n Fisica, Universidade Federal do Espirito Santo, Brazil"
],
[
"Fabris",
"J. C.",
"",
"Departamento de\n Fisica, Universidade Federal do Espirito Santo, Brazil"
],
[
"Goncalves",
"S. V. B.",
"",
"Departamento de\n ... | We exploit the possibility of existence of a repulsive gravity phase in the evolution of the Universe. A toy model with a free scalar field minimally coupled to gravity, but with the "wrong sign" for the energy and negative curvature for the spatial section, is studied in detail. The background solutions display a boun... |
2108.12823 | Antoine Rignon-Bret | Antoine Rignon-Bret, Carlo Rovelli | Black to white transition of a charged black hole | 12 pages, 13 figures | null | 10.1103/PhysRevD.105.086003 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We present an exact solution of the Maxwell-Einstein equations, which
describes the exterior of a charged spherical mass collapsing into its own
trapping horizon and then bouncing back from an anti-trapping horizon at the
same space location of the same asymptotic region. The solution is locally but
not globally isom... | [
{
"created": "Sun, 29 Aug 2021 11:16:07 GMT",
"version": "v1"
}
] | 2022-04-20 | [
[
"Rignon-Bret",
"Antoine",
""
],
[
"Rovelli",
"Carlo",
""
]
] | We present an exact solution of the Maxwell-Einstein equations, which describes the exterior of a charged spherical mass collapsing into its own trapping horizon and then bouncing back from an anti-trapping horizon at the same space location of the same asymptotic region. The solution is locally but not globally isomet... |
2109.02638 | Gamal G.L. Nashed | G.L.N. Nashed and Shin'ichi Nojiri | Rotating black hole in $f(R)$ theory | 15 Pages, 4 figures, accepted in JCAP | null | 10.1088/1475-7516/2021/11/007 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In general, the field equation of $f(R)$ gravitational theory is very
intricate, and therefore, it is not an easy task to derive analytical
solutions. We consider rotating black hole spacetime four-dimensional in the
$f(R)$ gravitational theory and derive a novel black hole solution. This black
hole reduced to the on... | [
{
"created": "Sat, 4 Sep 2021 06:57:10 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Oct 2021 11:34:40 GMT",
"version": "v2"
},
{
"created": "Thu, 7 Oct 2021 11:11:59 GMT",
"version": "v3"
},
{
"created": "Sun, 10 Oct 2021 11:10:46 GMT",
"version": "v4"
}
] | 2023-06-14 | [
[
"Nashed",
"G. L. N.",
""
],
[
"Nojiri",
"Shin'ichi",
""
]
] | In general, the field equation of $f(R)$ gravitational theory is very intricate, and therefore, it is not an easy task to derive analytical solutions. We consider rotating black hole spacetime four-dimensional in the $f(R)$ gravitational theory and derive a novel black hole solution. This black hole reduced to the one ... |
gr-qc/9810071 | Rong Gen Cai | Rong-Gen Cai | Stability of degenerate Cauchy horizons in black hole spacetimes | Revtex, 4 pages, no figures, references added | Phys.Rev. D59 (1999) 104004 | 10.1103/PhysRevD.59.104004 | null | gr-qc | null | In the multihorizon black hole spacetimes, it is possible that there are
degenerate Cauchy horizons with vanishing surface gravities. We investigate the
stability of the degenerate Cauchy horizon in black hole spacetimes. Despite
the asymptotic behavior of spacetimes (flat, anti-de Sitter, or de Sitter), we
find that... | [
{
"created": "Thu, 22 Oct 1998 06:08:14 GMT",
"version": "v1"
},
{
"created": "Sat, 14 Nov 1998 07:26:34 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Cai",
"Rong-Gen",
""
]
] | In the multihorizon black hole spacetimes, it is possible that there are degenerate Cauchy horizons with vanishing surface gravities. We investigate the stability of the degenerate Cauchy horizon in black hole spacetimes. Despite the asymptotic behavior of spacetimes (flat, anti-de Sitter, or de Sitter), we find that t... |
gr-qc/0310077 | Simone Mercuri | Simone Mercuri and Giovanni Montani | Revised Canonical Quantum Gravity via the Frame Fixing | 24 pages, 0 figures, to appear on Int. Jour. Mod. Phys. D | Int.J.Mod.Phys. D13 (2004) 165-186 | 10.1142/S0218271804004359 | null | gr-qc | null | We present a new reformulation of the canonical quantum geometrodynamics,
which allows to overcome the fundamental problem of the frozen formalism and,
therefore, to construct an appropriate Hilbert space associate to the solution
of the restated dynamics. More precisely, to remove the ambiguity contained in
the Whee... | [
{
"created": "Wed, 15 Oct 2003 11:00:23 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Mercuri",
"Simone",
""
],
[
"Montani",
"Giovanni",
""
]
] | We present a new reformulation of the canonical quantum geometrodynamics, which allows to overcome the fundamental problem of the frozen formalism and, therefore, to construct an appropriate Hilbert space associate to the solution of the restated dynamics. More precisely, to remove the ambiguity contained in the Wheele... |
gr-qc/0508103 | Yuxiao Liu | Yu-Xiao Liu, Li-Jie Zhang, Yong-Qiang Wang, Yi-Shi Duan | Energy-momentum for Randall-Sundrum models | 13 pages, no figures, v4: introduction and new conclusion added, v5:
11 pages, title changed and references added, accepted by Mod. Phys. Lett. A | Mod.Phys.Lett.A23:769-779,2008 | 10.1142/S0217732308024110 | null | gr-qc | null | We investigate the conservation law of energy-momentum for Randall-Sundrum
models by the general displacement transform. The energy-momentum current has a
superpotential and are therefore identically conserved. It is shown that for
Randall-Sundrum solution, the momentum vanishes and most of the bulk energy is
localiz... | [
{
"created": "Fri, 26 Aug 2005 03:50:05 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Sep 2005 08:52:36 GMT",
"version": "v2"
},
{
"created": "Thu, 8 Sep 2005 09:53:15 GMT",
"version": "v3"
},
{
"created": "Sun, 2 Oct 2005 06:04:29 GMT",
"version": "v4"
},
{
"crea... | 2008-11-26 | [
[
"Liu",
"Yu-Xiao",
""
],
[
"Zhang",
"Li-Jie",
""
],
[
"Wang",
"Yong-Qiang",
""
],
[
"Duan",
"Yi-Shi",
""
]
] | We investigate the conservation law of energy-momentum for Randall-Sundrum models by the general displacement transform. The energy-momentum current has a superpotential and are therefore identically conserved. It is shown that for Randall-Sundrum solution, the momentum vanishes and most of the bulk energy is localized... |
gr-qc/0407055 | Adam D. Helfer | Adam D. Helfer | State reduction and energy extraction from black holes | 12 pages, Elsevier macros, 2 included eps figures, to appear in
Physics Letters A | Phys.Lett. A329 (2004) 277-283 | 10.1016/j.physleta.2004.07.021 | null | gr-qc | null | I show that attempts to detect Hawking quanta would reduce the quantum state
to one containing ultra-energetic incoming particles; couplings of these to
other systems would extract ultra-high energies from the gravitational
collapse. As the collapse proceeds, these energies grow exponentially, rapidly
become trans-Pl... | [
{
"created": "Wed, 14 Jul 2004 19:42:01 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Helfer",
"Adam D.",
""
]
] | I show that attempts to detect Hawking quanta would reduce the quantum state to one containing ultra-energetic incoming particles; couplings of these to other systems would extract ultra-high energies from the gravitational collapse. As the collapse proceeds, these energies grow exponentially, rapidly become trans-Plan... |
gr-qc/0008051 | Plamen Fiziev | P.Fiziev | Cosmological Constant or Cosmological Potential | 33 pages, latex, slides, no figures. Three new slides added with: 1)
qualitative analysis of the $10^122$-problem based on classical action; 2)
Acknowledgments. Talk at conference "Problems of Vacuum Energy", Copenhagen,
23-26 August 2000 | null | null | SU-FzF: 3/2000 | gr-qc astro-ph hep-ph hep-th | null | In the framework of a model of minimal of dilatonic gravity (MDG) with
cosmological potential we consider: the relations of MDG with nonlinear gravity
and string theory; natural cosmological units, defined by cosmological
constant; the properties of cosmological factor, derived from solar system and
Earth-surface gra... | [
{
"created": "Tue, 22 Aug 2000 06:46:53 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Aug 2000 09:15:31 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Fiziev",
"P.",
""
]
] | In the framework of a model of minimal of dilatonic gravity (MDG) with cosmological potential we consider: the relations of MDG with nonlinear gravity and string theory; natural cosmological units, defined by cosmological constant; the properties of cosmological factor, derived from solar system and Earth-surface gravi... |
2311.03130 | Eanna E. Flanagan | Eanna E. Flanagan, David A. Nichols | Fully nonlinear transformations of the Weyl-Bondi-Metzner-Sachs
asymptotic symmetry group | 15 pages, no figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The asymptotic symmetry group of general relativity in asymptotically flat
spacetimes can be extended from the Bondi-Metzner-Sachs (BMS) group to the
generalized BMS (GMBS) group suggested by Campiglia and Laddha, which includes
arbitrary diffeomorphisms of the celestial two-sphere. It can be further
extended to the ... | [
{
"created": "Mon, 6 Nov 2023 14:27:47 GMT",
"version": "v1"
}
] | 2023-11-07 | [
[
"Flanagan",
"Eanna E.",
""
],
[
"Nichols",
"David A.",
""
]
] | The asymptotic symmetry group of general relativity in asymptotically flat spacetimes can be extended from the Bondi-Metzner-Sachs (BMS) group to the generalized BMS (GMBS) group suggested by Campiglia and Laddha, which includes arbitrary diffeomorphisms of the celestial two-sphere. It can be further extended to the We... |
2003.05014 | Alexander I Nesterov | Alexander I Nesterov, Gennady P Berman, Manuel A Rodr\'iguez
Fern\'andez and Xidi Wang | Decoherence as Detector of the Unruh Effect | 7 pages, 3 figures | Phys. Rev. Research 2, 043230 (2020) | 10.1103/PhysRevResearch.2.043230 | LA-UR-20-22227 | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new type of the Unruh-DeWitt detector which measures the
decoherence of the reduced density matrix of the detector interacting with the
massless quantum scalar field. We find that the decoherence decay rates are
different in the inertial and accelerated reference frames. We show that the
exponential phas... | [
{
"created": "Tue, 10 Mar 2020 21:45:09 GMT",
"version": "v1"
}
] | 2020-11-18 | [
[
"Nesterov",
"Alexander I",
""
],
[
"Berman",
"Gennady P",
""
],
[
"Fernández",
"Manuel A Rodríguez",
""
],
[
"Wang",
"Xidi",
""
]
] | We propose a new type of the Unruh-DeWitt detector which measures the decoherence of the reduced density matrix of the detector interacting with the massless quantum scalar field. We find that the decoherence decay rates are different in the inertial and accelerated reference frames. We show that the exponential phase ... |
1409.4674 | Abraham Harte | Abraham I. Harte | The not-so-nonlinear nonlinearity of Einstein's equation | 5 pages, added some additional details, accepted by PRL | Phys. Rev. Lett. 113, 261103 (2014) | 10.1103/PhysRevLett.113.261103 | AEI-2014-046 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Many of the technical complications associated with the general theory of
relativity ultimately stem from the nonlinearity of Einstein's equation. It is
shown here that an appropriate choice of dynamical variables may be used to
eliminate all such nonlinearities beyond a particular order: Both
Landau-Lifshitz and tet... | [
{
"created": "Tue, 16 Sep 2014 15:30:19 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Dec 2014 10:47:45 GMT",
"version": "v2"
}
] | 2015-01-07 | [
[
"Harte",
"Abraham I.",
""
]
] | Many of the technical complications associated with the general theory of relativity ultimately stem from the nonlinearity of Einstein's equation. It is shown here that an appropriate choice of dynamical variables may be used to eliminate all such nonlinearities beyond a particular order: Both Landau-Lifshitz and tetra... |
2408.06329 | Victoria Volkova | S. Mironov, M. Sharov, V. Volkova | Time-dependent, spherically symmetric background in Kaluza-Klein
compactified Horndeski theory and the speed of gravity waves | 8 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the models recently derived from a Kaluza-Klein compactification
of higher dimensional Horndeski theory, where the resulting electromagnetic
sector features non-trivial couplings to Horndeski scalar. In particular, this
class of theories admits the electromagnetic waves propagating at non-unit
speed, which... | [
{
"created": "Mon, 12 Aug 2024 17:46:25 GMT",
"version": "v1"
}
] | 2024-08-13 | [
[
"Mironov",
"S.",
""
],
[
"Sharov",
"M.",
""
],
[
"Volkova",
"V.",
""
]
] | We revisit the models recently derived from a Kaluza-Klein compactification of higher dimensional Horndeski theory, where the resulting electromagnetic sector features non-trivial couplings to Horndeski scalar. In particular, this class of theories admits the electromagnetic waves propagating at non-unit speed, which i... |
gr-qc/0406081 | Sergey Kozyrev | S. Kozyrev | The three dimensional theory of gravitation based on a temporal scalar
field in Riemanian geometry | 9 pages, Based on talks given at Santa Clara 2004. International
Workshop on Gravitation and Cosmology, Central University of Las Villas, 31
may-3 June, 2004, Cuba | null | null | null | gr-qc | null | A new approach to the model of the universe based on work by Rippl, Romero,
Tavakol is presented. We have used the scheme for relating the vacuum (D + 1)
dimensional theories to D dimensional theories for setting up a correspondence
between vacuum 4-dimensional Einstein theory with 3-dimensional gravity theory
with t... | [
{
"created": "Mon, 21 Jun 2004 05:32:57 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kozyrev",
"S.",
""
]
] | A new approach to the model of the universe based on work by Rippl, Romero, Tavakol is presented. We have used the scheme for relating the vacuum (D + 1) dimensional theories to D dimensional theories for setting up a correspondence between vacuum 4-dimensional Einstein theory with 3-dimensional gravity theory with tem... |
1905.07731 | Ali Kaya | Ali Kaya | Initial Condition Problem is Intractable in Cosmology | 10 pages, 2 figures, v2: comments added | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Determining the initial state of the universe is a challenging problem in
quantum cosmology and we argue that the issue is intractable if the basic
postulates of quantum mechanics are not modified in a nontrivial way. Namely a
"standard" quantum theory of gravity is expected to resolve the big-bang
singularity either... | [
{
"created": "Sun, 19 May 2019 12:27:21 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Oct 2019 14:53:06 GMT",
"version": "v2"
}
] | 2019-10-09 | [
[
"Kaya",
"Ali",
""
]
] | Determining the initial state of the universe is a challenging problem in quantum cosmology and we argue that the issue is intractable if the basic postulates of quantum mechanics are not modified in a nontrivial way. Namely a "standard" quantum theory of gravity is expected to resolve the big-bang singularity either b... |
gr-qc/9705061 | Boyko | B. V. Ivanov | Colliding axisymmetric pp-waves | 6 pages, REVTeX, some misprints are corrected | Phys.Rev. D57 (1998) 3378-3381 | 10.1103/PhysRevD.57.3378 | null | gr-qc | null | An exact solution is found describing the collision of axisymmetric pp-waves
with M=0. They are impulsive in character and their coordinate singularities
become point curvature singularities at the boundaries of the interaction
region. The solution is conformally flat. Concrete examples are given,
involving an ultrar... | [
{
"created": "Thu, 22 May 1997 13:41:41 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Oct 1997 07:06:48 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Ivanov",
"B. V.",
""
]
] | An exact solution is found describing the collision of axisymmetric pp-waves with M=0. They are impulsive in character and their coordinate singularities become point curvature singularities at the boundaries of the interaction region. The solution is conformally flat. Concrete examples are given, involving an ultrarel... |
2104.10172 | Pablo Bueno | Pablo Bueno, Pablo A. Cano, Javier Moreno, Guido van der Velde | Regular black holes in three dimensions | 11 pages, 2 figures | Phys. Rev. D 104, 021501 (2021) | 10.1103/PhysRevD.104.L021501 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find a plethora of new analytic black holes and globally regular
horizonless spacetimes in three dimensions. The solutions involve a single real
scalar field $\phi$ which always admits a magnetic-like expression proportional
to the angular coordinate. The new metrics, which satisfy $g_{tt}g_{rr}=-1$ and
represent ... | [
{
"created": "Tue, 20 Apr 2021 18:00:01 GMT",
"version": "v1"
}
] | 2021-07-07 | [
[
"Bueno",
"Pablo",
""
],
[
"Cano",
"Pablo A.",
""
],
[
"Moreno",
"Javier",
""
],
[
"van der Velde",
"Guido",
""
]
] | We find a plethora of new analytic black holes and globally regular horizonless spacetimes in three dimensions. The solutions involve a single real scalar field $\phi$ which always admits a magnetic-like expression proportional to the angular coordinate. The new metrics, which satisfy $g_{tt}g_{rr}=-1$ and represent co... |
gr-qc/0308007 | Manuel Tiglio | Gioel Calabrese, Luis Lehner, Oscar Reula, Olivier Sarbach, and Manuel
Tiglio | Summation by parts and dissipation for domains with excised regions | Some minor changes in presentation, to appear in CQG. 20 pages | Class.Quant.Grav. 21 (2004) 5735-5758 | 10.1088/0264-9381/21/24/004 | LSU-REL-080103 | gr-qc | null | We discuss finite difference techniques for hyperbolic equations in
non-trivial domains, as those that arise when simulating black hole spacetimes.
In particular, we construct dissipative and difference operators that satisfy
the {\it summation by parts} property in domains with excised multiple cubic
regions. This p... | [
{
"created": "Sun, 3 Aug 2003 20:13:52 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Oct 2004 18:43:16 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Calabrese",
"Gioel",
""
],
[
"Lehner",
"Luis",
""
],
[
"Reula",
"Oscar",
""
],
[
"Sarbach",
"Olivier",
""
],
[
"Tiglio",
"Manuel",
""
]
] | We discuss finite difference techniques for hyperbolic equations in non-trivial domains, as those that arise when simulating black hole spacetimes. In particular, we construct dissipative and difference operators that satisfy the {\it summation by parts} property in domains with excised multiple cubic regions. This pro... |
1012.4488 | Chad Galley | Chad R. Galley | A nonlinear scalar model of extreme mass ratio inspirals in effective
field theory I. Self force through third order | 30 pages, 8 figures | null | 10.1088/0264-9381/29/1/015010 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The motion of a small compact object in a background spacetime is
investigated in the context of a model nonlinear scalar field theory. This
model is constructed to have a perturbative structure analogous to the General
Relativistic description of extreme mass ratio inspirals (EMRIs). We apply the
effective field the... | [
{
"created": "Mon, 20 Dec 2010 21:59:21 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Galley",
"Chad R.",
""
]
] | The motion of a small compact object in a background spacetime is investigated in the context of a model nonlinear scalar field theory. This model is constructed to have a perturbative structure analogous to the General Relativistic description of extreme mass ratio inspirals (EMRIs). We apply the effective field theor... |
gr-qc/0202009 | Julio Cesar Fabris | F.G. Alvarenga, A.B. Batista, J.C. Fabris and S.V.B. Goncalves | Anisotropic quantum cosmological models: a discrepancy between
many-worlds and dBB interpretations | Latex file, 15 pages, 2 figures | null | null | null | gr-qc hep-th quant-ph | null | In the isotropic quantum cosmological perfect fluid model, the initial
singularity can be avoided, while the classical behaviour is recovered
asymptotically. We verify if initial anisotropies can also be suppressed in a
quantum version of a classical anisotropic model where gravity is coupled to a
perfect fluid. Empl... | [
{
"created": "Mon, 4 Feb 2002 18:18:57 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Alvarenga",
"F. G.",
""
],
[
"Batista",
"A. B.",
""
],
[
"Fabris",
"J. C.",
""
],
[
"Goncalves",
"S. V. B.",
""
]
] | In the isotropic quantum cosmological perfect fluid model, the initial singularity can be avoided, while the classical behaviour is recovered asymptotically. We verify if initial anisotropies can also be suppressed in a quantum version of a classical anisotropic model where gravity is coupled to a perfect fluid. Employ... |
gr-qc/0308075 | Johan Noldus | Johan Noldus | The limit space of a Cauchy sequence of globally hyperbolic spacetimes | 31 pages, 5 figures, submitted to Classical and Quantum gravity,
seriously improved presentation | Class.Quant.Grav. 21 (2004) 851-874 | 10.1088/0264-9381/21/4/008 | null | gr-qc math.MG | null | In this second paper, I construct a limit space of a Cauchy sequence of
globally hyperbolic spacetimes. In the second section, I work gradually towards
a construction of the limit space. I prove the limit space is unique up to
isometry. I als show that, in general, the limit space has quite complicated
causal behavio... | [
{
"created": "Fri, 22 Aug 2003 19:25:36 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Aug 2003 20:18:07 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Sep 2003 13:59:22 GMT",
"version": "v3"
},
{
"created": "Tue, 18 Nov 2003 09:46:31 GMT",
"version": "v4"
}
] | 2009-11-10 | [
[
"Noldus",
"Johan",
""
]
] | In this second paper, I construct a limit space of a Cauchy sequence of globally hyperbolic spacetimes. In the second section, I work gradually towards a construction of the limit space. I prove the limit space is unique up to isometry. I als show that, in general, the limit space has quite complicated causal behaviour... |
gr-qc/0606092 | Lorenzo Iorio | Lorenzo Iorio | Evidence of the gravitomagnetic field of Mars | Latex, 6 pages, 1 figure, 1 table. Accepted for publication in
Classical and Quantum Gravity | Class.Quant.Grav. 23 (2006) 5451-5454 | 10.1088/0264-9381/23/17/N01 | null | gr-qc astro-ph | null | According to general relativity, the gravitomagnetic Lense-Thirring force of
Mars would secularly shift the orbital plane of the Mars Global Surveyor (MGS)
spacecraft by an amount of 1.5 m, on average, in the cross-track direction over
5 years. The determined cross-track post-fit residuals of MGS, built up by
neglect... | [
{
"created": "Wed, 21 Jun 2006 16:33:10 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Iorio",
"Lorenzo",
""
]
] | According to general relativity, the gravitomagnetic Lense-Thirring force of Mars would secularly shift the orbital plane of the Mars Global Surveyor (MGS) spacecraft by an amount of 1.5 m, on average, in the cross-track direction over 5 years. The determined cross-track post-fit residuals of MGS, built up by neglectin... |
gr-qc/0610094 | Yongli Ping | Yongli Ping, Hongya Liu, Lixin Xu | Using (4+1) split and energy conditions to study the induced matter in
5D Ricc-flat cosmology | 10 pages. To appear in IJMPA | Int.J.Mod.Phys.A22:985-994,2007 | 10.1142/S0217751X07034404 | null | gr-qc | null | We use $(4+1)$ split to derive the 4D induced energy density $\rho $ and
pressure $p$ of the $5D$ Ricci-flat cosmological solutions which are
characterized by having a bounce instead of a bang. The solutions contain two
arbitrary functions of time $t$ and, therefore, are mathematically rich in
giving various cosmolog... | [
{
"created": "Thu, 19 Oct 2006 03:20:38 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ping",
"Yongli",
""
],
[
"Liu",
"Hongya",
""
],
[
"Xu",
"Lixin",
""
]
] | We use $(4+1)$ split to derive the 4D induced energy density $\rho $ and pressure $p$ of the $5D$ Ricci-flat cosmological solutions which are characterized by having a bounce instead of a bang. The solutions contain two arbitrary functions of time $t$ and, therefore, are mathematically rich in giving various cosmologic... |
1304.6592 | Cosimo Bambi | Zilong Li, Cosimo Bambi | Destroying the event horizon of regular black holes | 4 pages, 2 figures. v2: two references added | Phys.Rev.D87:124022,2013 | 10.1103/PhysRevD.87.124022 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, several authors have studied the possibility of overspinning or
overcharging an existing black hole to destroy its event horizon and make the
central singularity naked. When all the effects are properly taken into
account, any attempt to destroy the black hole seems to be doomed to fail, in
agreement with t... | [
{
"created": "Wed, 24 Apr 2013 14:06:15 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Jun 2013 22:38:16 GMT",
"version": "v2"
}
] | 2013-06-24 | [
[
"Li",
"Zilong",
""
],
[
"Bambi",
"Cosimo",
""
]
] | Recently, several authors have studied the possibility of overspinning or overcharging an existing black hole to destroy its event horizon and make the central singularity naked. When all the effects are properly taken into account, any attempt to destroy the black hole seems to be doomed to fail, in agreement with the... |
2009.08800 | Ahmed Farag Ali | Omar El-Refy, Syed Masood, Li-Gang Wang, Ahmed Farag Ali | Rainbow Spacetime from a Nonlocal Gravitational Uncertainty Principle | 5 pages, revtex4, 2 figures, to appear in EPL (Europhysics Letters) | EPL, 132 (2020) 10006 | 10.1209/0295-5075/132/10006 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Occurrence of spacetime singularities is one of the peculiar features of
Einstein gravity, signalling limitation on probing short distances in
spacetime. This alludes to the existence of a fundamental length scale in
nature. On contrary, Heisenberg quantum uncertainty relation seems to allow for
probing arbitrarily s... | [
{
"created": "Wed, 16 Sep 2020 18:48:57 GMT",
"version": "v1"
}
] | 2020-12-21 | [
[
"El-Refy",
"Omar",
""
],
[
"Masood",
"Syed",
""
],
[
"Wang",
"Li-Gang",
""
],
[
"Ali",
"Ahmed Farag",
""
]
] | Occurrence of spacetime singularities is one of the peculiar features of Einstein gravity, signalling limitation on probing short distances in spacetime. This alludes to the existence of a fundamental length scale in nature. On contrary, Heisenberg quantum uncertainty relation seems to allow for probing arbitrarily sma... |
1907.13081 | Teodor Borislavov Vasilev | Teodor Borislavov Vasilev, Mariam Bouhmadi-L\'opez and Prado
Mart\'in-Moruno | The classical and quantum fate of the Little Sibling of the Big Rip in
$f(R)$ cosmology | 10 pages; title changed; 1 table added; 8 references added; no
physics changes. This version accepted for publication in Physical Review D | Phys. Rev. D 100, 084016 (2019) | 10.1103/PhysRevD.100.084016 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Little Sibling of the Big Rip is a cosmological abrupt event predicted by
some phantom cosmological models that could describe our Universe. When this
event is approached the observable Universe and its expansion rate grow
infinitely, but its cosmic derivative remains finite. In this work we have
obtained the gro... | [
{
"created": "Tue, 30 Jul 2019 17:11:05 GMT",
"version": "v1"
},
{
"created": "Sun, 22 Sep 2019 18:30:45 GMT",
"version": "v2"
}
] | 2019-10-16 | [
[
"Vasilev",
"Teodor Borislavov",
""
],
[
"Bouhmadi-López",
"Mariam",
""
],
[
"Martín-Moruno",
"Prado",
""
]
] | The Little Sibling of the Big Rip is a cosmological abrupt event predicted by some phantom cosmological models that could describe our Universe. When this event is approached the observable Universe and its expansion rate grow infinitely, but its cosmic derivative remains finite. In this work we have obtained the group... |
gr-qc/0507027 | Thomas Sotiriou | Thomas P. Sotiriou | The nearly Newtonian regime in Non-Linear Theories of Gravity | typos corrected, replaced to match published version | Gen.Rel.Grav.38:1407-1417,2006 | 10.1007/s10714-006-0328-8 | null | gr-qc astro-ph hep-th | null | The present paper reconsiders the Newtonian limit of models of modified
gravity including higher order terms in the scalar curvature in the
gravitational action. This was studied using the Palatini variational principle
in [Meng X. and Wang P.: Gen. Rel. Grav. {\bf 36}, 1947 (2004)] and
[Dom\'inguez A. E. and Barraco... | [
{
"created": "Thu, 7 Jul 2005 13:30:46 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Mar 2006 18:48:08 GMT",
"version": "v2"
},
{
"created": "Mon, 28 Aug 2006 14:49:51 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Sotiriou",
"Thomas P.",
""
]
] | The present paper reconsiders the Newtonian limit of models of modified gravity including higher order terms in the scalar curvature in the gravitational action. This was studied using the Palatini variational principle in [Meng X. and Wang P.: Gen. Rel. Grav. {\bf 36}, 1947 (2004)] and [Dom\'inguez A. E. and Barraco D... |
gr-qc/9607014 | Cayetano Di Bartolo | Cayetano Di Bartolo | The Gauss Constraint in the Extended Loop Representation | 8 pages, latex, no figures | Phys.Lett. B389 (1996) 661-664 | 10.1016/S0370-2693(96)01339-1 | null | gr-qc | null | The Gauss constraint in the extended loop representation for quantum gravity
is studied. It is shown that there exists a sector of the state space that is
rigorously gauge invariant without the generic convergence issues of the
extended holonomies.
| [
{
"created": "Fri, 5 Jul 1996 15:38:21 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Di Bartolo",
"Cayetano",
""
]
] | The Gauss constraint in the extended loop representation for quantum gravity is studied. It is shown that there exists a sector of the state space that is rigorously gauge invariant without the generic convergence issues of the extended holonomies. |
gr-qc/0510065 | Julian Wilson | Julian B. Wilson | The Prevention of Singularities Inside Black Holes | 10 pages, presented at the 2005 Joint Annual Conference of the
National Society of Black Physicists and the National Society of Hispanic
Physicists | null | null | null | gr-qc | null | In this paper the currently held view that the endpoint of gravitational
collapse is a singularity is refuted. A quantum mechanical calculation is done
showing that spin 0 and spin 1/2 particles inside a black hole's schwarzschild
radius aren't confined to an infinitesimal point but form bound state orbits.
As with t... | [
{
"created": "Thu, 13 Oct 2005 20:17:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wilson",
"Julian B.",
""
]
] | In this paper the currently held view that the endpoint of gravitational collapse is a singularity is refuted. A quantum mechanical calculation is done showing that spin 0 and spin 1/2 particles inside a black hole's schwarzschild radius aren't confined to an infinitesimal point but form bound state orbits. As with the... |
2311.14403 | Aneta Wojnar | Aneta Wojnar | Introduction to stellar and substellar physics in modified gravity | 24 pages, Invited contribution to "Gravity, Cosmology, and
Astrophysics -- A Journey of Exploration and Discovery with Female Pioneers"
(editors Betti Hartmann, Jutta Kunz), Springer 2023 | Lect.Notes Phys. 1022 (2023) 173-196 | null | null | gr-qc astro-ph.EP astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the standard Lane-Emden formalism as well as the one related to
the slowly rotating objects. It is preceded by a brief introduction of
different forms of the polytropic equation of state. This allows to study a
wide class of astrophysical objects in the framework of a given theory of
gravity, as demonstrat... | [
{
"created": "Fri, 24 Nov 2023 10:51:01 GMT",
"version": "v1"
}
] | 2024-02-12 | [
[
"Wojnar",
"Aneta",
""
]
] | We discuss the standard Lane-Emden formalism as well as the one related to the slowly rotating objects. It is preceded by a brief introduction of different forms of the polytropic equation of state. This allows to study a wide class of astrophysical objects in the framework of a given theory of gravity, as demonstrated... |
gr-qc/9302007 | Andrew Barvinski | A.O.Barvinsky, A.Yu.Kamenshchik and I.P.Karmazin | The renormalization group for non-renormalizable theories: Einstein
gravity with a scalar field | 54 pages, preprint Alberta Thy-6-93, latex | Phys.Rev.D48:3677-3694,1993 | 10.1103/PhysRevD.48.3677 | null | gr-qc | null | We develop a renormalization-group formalism for non-renormalizable theories
and apply it to Einstein gravity theory coupled to a scalar field with the
Lagrangian $L=\sqrt{g} [R U(\phi)-{1/2} G(\phi) g^{\mu\nu} \partial_{\mu}\phi
\partial_{\nu}\phi- V(\phi)]$, where $U(\phi), G(\phi)$ and $V(\phi)$ are
arbitrary func... | [
{
"created": "Mon, 8 Feb 1993 23:16:29 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Jun 1993 01:44:05 GMT",
"version": "v2"
}
] | 2011-07-19 | [
[
"Barvinsky",
"A. O.",
""
],
[
"Kamenshchik",
"A. Yu.",
""
],
[
"Karmazin",
"I. P.",
""
]
] | We develop a renormalization-group formalism for non-renormalizable theories and apply it to Einstein gravity theory coupled to a scalar field with the Lagrangian $L=\sqrt{g} [R U(\phi)-{1/2} G(\phi) g^{\mu\nu} \partial_{\mu}\phi \partial_{\nu}\phi- V(\phi)]$, where $U(\phi), G(\phi)$ and $V(\phi)$ are arbitrary functi... |
0906.3808 | Kourosh Nozari | Kourosh Nozari and Narges Rashidi | A Braneworld Dark Energy Model with Induced Gravity and the Gauss-Bonnet
Effect | 20 pages, 3 eps figures, to appear in IJTP | Int.J.Theor.Phys.48:2800-2817,2009 | 10.1007/s10773-009-0070-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a holographic dark energy model with a non-minimally coupled
scalar field on the brane where Gauss-Bonnet and Induced Gravity effects are
taken into account. This model provides a wide parameter space with several
interesting cosmological implications. Especially, the equation of state
parameter of the m... | [
{
"created": "Sat, 20 Jun 2009 13:06:33 GMT",
"version": "v1"
}
] | 2010-04-30 | [
[
"Nozari",
"Kourosh",
""
],
[
"Rashidi",
"Narges",
""
]
] | We construct a holographic dark energy model with a non-minimally coupled scalar field on the brane where Gauss-Bonnet and Induced Gravity effects are taken into account. This model provides a wide parameter space with several interesting cosmological implications. Especially, the equation of state parameter of the mod... |
1806.06271 | Piyabut Burikham | Sirachak Panpanich and Piyabut Burikham | Fitting rotation curve of galaxies by de Rham-Gabadadze-Tolley massive
gravity | 11 pages, 4 figures | Phys. Rev. D 98, 064008 (2018) | 10.1103/PhysRevD.98.064008 | null | gr-qc astro-ph.GA hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate effects of massive graviton on the rotation curves of the
Milky Way, spiral galaxies and Low Surface Brightness~(LSB) galaxies. Using a
simple de Rham, Gabadadze, and Tolley (dRGT) massive gravity model, we find
static spherically symmetric metric and a modified Tolman-Oppenheimer-Volkoff
(TOV) equatio... | [
{
"created": "Sat, 16 Jun 2018 17:25:22 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Sep 2018 12:02:19 GMT",
"version": "v2"
}
] | 2018-09-19 | [
[
"Panpanich",
"Sirachak",
""
],
[
"Burikham",
"Piyabut",
""
]
] | We investigate effects of massive graviton on the rotation curves of the Milky Way, spiral galaxies and Low Surface Brightness~(LSB) galaxies. Using a simple de Rham, Gabadadze, and Tolley (dRGT) massive gravity model, we find static spherically symmetric metric and a modified Tolman-Oppenheimer-Volkoff (TOV) equation.... |
2303.07238 | A. C. Khunt | A. C. Khunt, V. O. Thomas and P. C. Vinodkumar | Relativistic stellar modeling with perfect fluid core and anisotropic
envelope fluid | 28 pages, 11 Figures, accepted for publication in Indian J. Phys | Indian J Phys (2023) | 10.1007/s12648-023-02692-1 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We investigate the effect of density perturbations and local anisotropy on
the stability of stellar matter structures in general relativity using the
concept of cracking. Adopting a core-envelope model of a super-dense star, we
examine the properties and stability conditions by introducing anisotropic
pressure to the... | [
{
"created": "Mon, 13 Mar 2023 16:10:23 GMT",
"version": "v1"
}
] | 2023-04-11 | [
[
"Khunt",
"A. C.",
""
],
[
"Thomas",
"V. O.",
""
],
[
"Vinodkumar",
"P. C.",
""
]
] | We investigate the effect of density perturbations and local anisotropy on the stability of stellar matter structures in general relativity using the concept of cracking. Adopting a core-envelope model of a super-dense star, we examine the properties and stability conditions by introducing anisotropic pressure to the e... |
1802.10194 | LVC Publications | The LIGO Scientific Collaboration and the Virgo Collaboration: B. P.
Abbott, R. Abbott, T. D. Abbott, F. Acernese, K. Ackley, C. Adams, T. Adams,
P. Addesso, R. X. Adhikari, V. B. Adya, C. Affeldt, M. Afrough, B. Agarwal,
M. Agathos, K. Agatsuma, N. Aggarwal, O. D. Aguiar, L. Aiello, A. Ain, P.
Ajith, B. Allen,... | A Search for Tensor, Vector, and Scalar Polarizations in the Stochastic
Gravitational-Wave Background | Minor updates to match published version | Phys. Rev. Lett. 120, 201102 (2018) | 10.1103/PhysRevLett.120.201102 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The detection of gravitational waves with Advanced LIGO and Advanced Virgo
has enabled novel tests of general relativity, including direct study of the
polarization of gravitational waves. While general relativity allows for only
two tensor gravitational-wave polarizations, general metric theories can
additionally pr... | [
{
"created": "Tue, 27 Feb 2018 22:38:21 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Mar 2018 23:32:28 GMT",
"version": "v2"
},
{
"created": "Wed, 2 Oct 2019 16:30:52 GMT",
"version": "v3"
}
] | 2019-10-03 | [
[
"The LIGO Scientific Collaboration",
"",
""
],
[
"the Virgo Collaboration",
"",
""
],
[
"Abbott",
"B. P.",
""
],
[
"Abbott",
"R.",
""
],
[
"Abbott",
"T. D.",
""
],
[
"Acernese",
"F.",
""
],
[
"Ackley",
"K.",
... | The detection of gravitational waves with Advanced LIGO and Advanced Virgo has enabled novel tests of general relativity, including direct study of the polarization of gravitational waves. While general relativity allows for only two tensor gravitational-wave polarizations, general metric theories can additionally pred... |
1407.0011 | G. Q. Li | Gu-Qiang Li | Effects of dark energy on P-V criticality of charged AdS black holes | 13 pages, 2 figures | Physics Letters B (2014), pp.256-260 | 10.1016/j.physletb.2014.06.047 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this Letter, we investigate the effects of dark energy on $P-V$
criticality of charged AdS black holes by considering the case of the RN-AdS
black holes surrounded by quintessence. By treating the cosmological constant
as thermodynamic pressure, we study its thermodynamics in the extended phase
space. It is shown ... | [
{
"created": "Mon, 30 Jun 2014 08:12:56 GMT",
"version": "v1"
}
] | 2014-07-02 | [
[
"Li",
"Gu-Qiang",
""
]
] | In this Letter, we investigate the effects of dark energy on $P-V$ criticality of charged AdS black holes by considering the case of the RN-AdS black holes surrounded by quintessence. By treating the cosmological constant as thermodynamic pressure, we study its thermodynamics in the extended phase space. It is shown th... |
gr-qc/0509046 | Dinesh Singh | Dinesh Singh | The Dynamics of a Classical Spinning Particle in Vaidya Space-Time | REVTeX file, 20 pages, 26 figures | Phys.Rev.D72:084033,2005 | 10.1103/PhysRevD.72.084033 | null | gr-qc astro-ph | null | Based on the Mathisson-Papapetrou-Dixon (MPD) equations and the Vaidya
metric, the motion of a spinning point particle orbiting a non-rotating star
while undergoing radiation-induced gravitational collapse is studied in detail.
A comprehensive analysis of the orbital dynamics is performed assuming distinct
central ma... | [
{
"created": "Tue, 13 Sep 2005 13:56:32 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Singh",
"Dinesh",
""
]
] | Based on the Mathisson-Papapetrou-Dixon (MPD) equations and the Vaidya metric, the motion of a spinning point particle orbiting a non-rotating star while undergoing radiation-induced gravitational collapse is studied in detail. A comprehensive analysis of the orbital dynamics is performed assuming distinct central mass... |
1610.06796 | Pasquale Bosso | Pasquale Bosso, Saurya Das, Igor Pikovski, Michael R. Vanner | Amplified transduction of Planck-scale effects using quantum optics | 7 pages, 2 figures | Phys. Rev. A 96, 023849 (2017) | 10.1103/PhysRevA.96.023849 | null | gr-qc cond-mat.mes-hall hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The unification of quantum mechanics and gravity remains as one of the
primary challenges of present-day physics. Quantum-gravity-inspired
phenomenological models offer a window to explore potential aspects of quantum
gravity including qualitatively new behaviour that can be experimentally
tested. One such phenomenol... | [
{
"created": "Fri, 21 Oct 2016 14:12:41 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Jul 2017 20:35:43 GMT",
"version": "v2"
},
{
"created": "Thu, 24 Aug 2017 16:15:11 GMT",
"version": "v3"
}
] | 2017-08-25 | [
[
"Bosso",
"Pasquale",
""
],
[
"Das",
"Saurya",
""
],
[
"Pikovski",
"Igor",
""
],
[
"Vanner",
"Michael R.",
""
]
] | The unification of quantum mechanics and gravity remains as one of the primary challenges of present-day physics. Quantum-gravity-inspired phenomenological models offer a window to explore potential aspects of quantum gravity including qualitatively new behaviour that can be experimentally tested. One such phenomenolog... |
1306.5206 | Hal Haggard | Eugenio Bianchi, Hal M. Haggard, and Carlo Rovelli | The boundary is mixed | 8 pages, 2 figures | General Relativity and Gravition (2017) 49: 100 | 10.1007/s10714-017-2263-2 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that Oeckl's boundary formalism incorporates quantum statistical
mechanics naturally, and we formulate general-covariant quantum statistical
mechanics in this language. We illustrate the formalism by showing how it
accounts for the Unruh effect. We observe that the distinction between pure and
mixed states we... | [
{
"created": "Fri, 21 Jun 2013 18:17:24 GMT",
"version": "v1"
}
] | 2017-07-10 | [
[
"Bianchi",
"Eugenio",
""
],
[
"Haggard",
"Hal M.",
""
],
[
"Rovelli",
"Carlo",
""
]
] | We show that Oeckl's boundary formalism incorporates quantum statistical mechanics naturally, and we formulate general-covariant quantum statistical mechanics in this language. We illustrate the formalism by showing how it accounts for the Unruh effect. We observe that the distinction between pure and mixed states weak... |
1509.01512 | Emil Nissimov | Eduardo Guendelman, Emil Nissimov, Svetlana Pacheva | Cosmology via Metric-Independent Volume-Form Dynamics | 6 pages, talk at "Karl Schwarzschild Meeting 2015", Frankfurt
Institute for Advanced Studies (20-24 July 2015) | Springer Proceedings in Physics v.208, pp.175-181 (2018) | 10.1007/978-3-319-94256-8_20 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The method of non-Riemannian volume-forms (metric-independent covariant
integration measure densities on the spacetime manifold) is applied to
construct a unified model of dynamical dark energy plus dark matter as a dust
fluid resulting from a hidden Noether symmetry of the pertinent scalar field
Lagrangian. Canonica... | [
{
"created": "Fri, 4 Sep 2015 16:03:55 GMT",
"version": "v1"
}
] | 2020-03-26 | [
[
"Guendelman",
"Eduardo",
""
],
[
"Nissimov",
"Emil",
""
],
[
"Pacheva",
"Svetlana",
""
]
] | The method of non-Riemannian volume-forms (metric-independent covariant integration measure densities on the spacetime manifold) is applied to construct a unified model of dynamical dark energy plus dark matter as a dust fluid resulting from a hidden Noether symmetry of the pertinent scalar field Lagrangian. Canonical ... |
1702.04601 | Carsten Gundlach | Joanna Ja{\l}mu\.zna and Carsten Gundlach | Critical collapse of a rotating scalar field in $2+1$ dimensions | Version accepted for publication in PRD | Phys. Rev. D 95, 084001 (2017) | 10.1103/PhysRevD.95.084001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We carry out numerical simulations of the collapse of a complex rotating
scalar field of the form $\Psi(t,r,\theta)=e^{im\theta}\Phi(t,r)$, giving rise
to an axisymmetric metric, in 2+1 spacetime dimensions with cosmological
constant $\Lambda<0$, for $m=0,1,2$, for four 1-parameter families of initial
data. We look f... | [
{
"created": "Wed, 15 Feb 2017 13:34:23 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Mar 2017 09:00:03 GMT",
"version": "v2"
}
] | 2017-04-12 | [
[
"Jałmużna",
"Joanna",
""
],
[
"Gundlach",
"Carsten",
""
]
] | We carry out numerical simulations of the collapse of a complex rotating scalar field of the form $\Psi(t,r,\theta)=e^{im\theta}\Phi(t,r)$, giving rise to an axisymmetric metric, in 2+1 spacetime dimensions with cosmological constant $\Lambda<0$, for $m=0,1,2$, for four 1-parameter families of initial data. We look for... |
2112.03219 | Abbas Sherif | Abbas M Sherif, Peter K S Dunsby and Rituparno Goswami | On some locally symmetric embedded spaces with non-negative scalar
curvature and their characterization | 27 pages, no figure, few typos corrected, results unchanged, Accepted
for publication in IJGMMP | null | 10.1142/S0219887822500517 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this work we perform a general study of properties of a class of locally
symmetric embedded hypersurfaces in spacetimes admitting a $1+1+2$ spacetime
decomposition. The hypersurfaces are given by specifying the form of the Ricci
tensor with respect to the induced metric. These are slices of constant time in
the sp... | [
{
"created": "Mon, 6 Dec 2021 18:21:36 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Dec 2021 03:52:24 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Dec 2021 08:26:01 GMT",
"version": "v3"
}
] | 2022-04-06 | [
[
"Sherif",
"Abbas M",
""
],
[
"Dunsby",
"Peter K S",
""
],
[
"Goswami",
"Rituparno",
""
]
] | In this work we perform a general study of properties of a class of locally symmetric embedded hypersurfaces in spacetimes admitting a $1+1+2$ spacetime decomposition. The hypersurfaces are given by specifying the form of the Ricci tensor with respect to the induced metric. These are slices of constant time in the spac... |
gr-qc/9402007 | Juan Pablo | Juan Pablo Paz | Decoherence in Quantum Brownian Motion | 14 Pages, 2 Figures available upon request, Preprint LA-UR-92-878, to
appear in ``The Physical Origins of Time Asymmetry'' ed by J.J. Halliwell et
al., Cambridge Univ. Press | null | null | null | gr-qc hep-th | null | We examine the dependence of decoherence on the spectral density of the
environment as well as on the initial state of the system. We use two simple
examples to illustrate some important effects. The simplest derivation of the
general form of the master equation for a general quantum Brownian motion is
outlined in an... | [
{
"created": "Wed, 2 Feb 1994 17:42:11 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Paz",
"Juan Pablo",
""
]
] | We examine the dependence of decoherence on the spectral density of the environment as well as on the initial state of the system. We use two simple examples to illustrate some important effects. The simplest derivation of the general form of the master equation for a general quantum Brownian motion is outlined in an A... |
1108.0564 | Samad Khakshournia | S. Khakshournia | Gravitational Collapse of a Rotating Cylindrical Null Shell in the
Cosmic String Spacetime | 6 pages, work presented at the 8th Alexander Friedmann International
Seminar on Gravitation and Cosmology, Rio de Janeiro, Brazil, June 2011 | null | 10.1142/S2010194511000948 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the gravitational collapse of a rotating cylindrical null shell with
flat interior and the metric of a spinning cosmic string as the exterior. We
see that there is a critical radius, where the energy density of the shell
vanishes and beyond which it would be negative, thereby signaling that the
matching woul... | [
{
"created": "Tue, 2 Aug 2011 12:59:57 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Khakshournia",
"S.",
""
]
] | We study the gravitational collapse of a rotating cylindrical null shell with flat interior and the metric of a spinning cosmic string as the exterior. We see that there is a critical radius, where the energy density of the shell vanishes and beyond which it would be negative, thereby signaling that the matching would ... |
1002.3041 | Bogus{\l}aw Broda | Bogus{\l}aw Broda, Micha{\l} Szanecki | A relation between the Barbero-Immirzi parameter and the standard model | 6 pages, accepted version | Phys.Lett.B690:87-89,2010 | 10.1016/j.physletb.2010.05.004 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been shown that Sakharov's induced, from the fields entering the
standard model, Barbero-Immirzi parameter assumes, in the framework of
euclidean formalism, the UV cutoff-independent value, 1/9. The calculus uses
the Schwinger's proper-time formalism, the Seeley-DeWitt heat-kernel expansion,
and it is akin to ... | [
{
"created": "Tue, 16 Feb 2010 10:05:59 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Feb 2010 15:33:23 GMT",
"version": "v2"
},
{
"created": "Wed, 5 May 2010 10:50:31 GMT",
"version": "v3"
}
] | 2014-11-20 | [
[
"Broda",
"Bogusław",
""
],
[
"Szanecki",
"Michał",
""
]
] | It has been shown that Sakharov's induced, from the fields entering the standard model, Barbero-Immirzi parameter assumes, in the framework of euclidean formalism, the UV cutoff-independent value, 1/9. The calculus uses the Schwinger's proper-time formalism, the Seeley-DeWitt heat-kernel expansion, and it is akin to th... |
0909.4672 | Salvatore Capozziello | S. Capozziello, M. De Laurentis, V. Faraoni | A bird's eye view of f(R)-gravity | 28 pages, 4 figures, Invited Review for The Special Issue in
Cosmology, The Open Astronomy Journal, Eds. S.D. Odintsov et al | null | 10.2174/1874381101003010049 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We survey the landscape of $f(R)$ theories of gravity in their various
formulations, which have been used to model the cosmic acceleration as
alternatives to dark energy and dark matter. Besides, we take into account the
problem of gravitational waves in such theories. We discuss some successes of
$f(R)$-gravity (whe... | [
{
"created": "Fri, 25 Sep 2009 15:18:49 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Oct 2009 09:45:21 GMT",
"version": "v2"
}
] | 2015-05-14 | [
[
"Capozziello",
"S.",
""
],
[
"De Laurentis",
"M.",
""
],
[
"Faraoni",
"V.",
""
]
] | We survey the landscape of $f(R)$ theories of gravity in their various formulations, which have been used to model the cosmic acceleration as alternatives to dark energy and dark matter. Besides, we take into account the problem of gravitational waves in such theories. We discuss some successes of $f(R)$-gravity (where... |
2005.14016 | Antoni Ramos Buades | Antoni Ramos-Buades, Shubhanshu Tiwari, Maria Haney and Sascha Husa | Impact of eccentricity on the gravitational wave searches for binary
black holes: High mass case | null | Phys. Rev. D 102, 043005 (2020) | 10.1103/PhysRevD.102.043005 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The possible formation of stellar-mass binary black holes through dynamical
interactions in dense stellar environments predicts the existence of binaries
with non-negligible eccentricity in the frequency band of ground-based
gravitational wave detectors; the detection of binary black hole mergers with
measurable orbi... | [
{
"created": "Thu, 28 May 2020 14:00:24 GMT",
"version": "v1"
}
] | 2020-08-19 | [
[
"Ramos-Buades",
"Antoni",
""
],
[
"Tiwari",
"Shubhanshu",
""
],
[
"Haney",
"Maria",
""
],
[
"Husa",
"Sascha",
""
]
] | The possible formation of stellar-mass binary black holes through dynamical interactions in dense stellar environments predicts the existence of binaries with non-negligible eccentricity in the frequency band of ground-based gravitational wave detectors; the detection of binary black hole mergers with measurable orbita... |
1405.4899 | Christos Tzounis | Valeri P. Frolov, Andrey A. Shoom and Christos Tzounis | Radiation from an emitter revolving around a magnetized non-rotating
black hole | 20 pages, 21 figures. arXiv admin note: text overlap with
arXiv:1405.0510 | PhysRevD.90.024027 (2014) | 10.1103/PhysRevD.90.024027 | Alberta-Thy-09-14 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the methods of study of black holes in astrophysics is based on
broadening of the spectrum of radiation of ionized Iron atoms. The line
K$\alpha$ associated with Iron emission at 6.4 keV is very narrow. If such an
ion is revolving around a black hole, this line is effectively broadened as a
result of the Doppl... | [
{
"created": "Mon, 19 May 2014 21:22:17 GMT",
"version": "v1"
}
] | 2015-09-09 | [
[
"Frolov",
"Valeri P.",
""
],
[
"Shoom",
"Andrey A.",
""
],
[
"Tzounis",
"Christos",
""
]
] | One of the methods of study of black holes in astrophysics is based on broadening of the spectrum of radiation of ionized Iron atoms. The line K$\alpha$ associated with Iron emission at 6.4 keV is very narrow. If such an ion is revolving around a black hole, this line is effectively broadened as a result of the Doppler... |
gr-qc/0212119 | Saibal Ray | Saibal Ray and Sumana Bhadra | Energy density in general relativity: a possible role for cosmological
constant | 12 Latex pages | Phys.Lett. A322 (2004) 150-155 | 10.1016/j.physleta.2004.01.029 | null | gr-qc | null | We consider a static spherically symmetric charged anisotropic fluid source
of finite physical radius (\sim 10^{-16} cm) by introducing a scalar variable
\Lambda dependent on the radial coordinate r under general relativity. From the
solution sets a possible role of the cosmological constant is investigated
which ind... | [
{
"created": "Sun, 29 Dec 2002 16:53:49 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Jun 2003 15:05:10 GMT",
"version": "v2"
},
{
"created": "Tue, 18 Oct 2005 16:18:16 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Ray",
"Saibal",
""
],
[
"Bhadra",
"Sumana",
""
]
] | We consider a static spherically symmetric charged anisotropic fluid source of finite physical radius (\sim 10^{-16} cm) by introducing a scalar variable \Lambda dependent on the radial coordinate r under general relativity. From the solution sets a possible role of the cosmological constant is investigated which indic... |
2105.06793 | Guillaume Boileau | Guillaume Boileau, Astrid Lamberts, Nelson Christensen, Neil J.
Cornish, Renate Meyer | Spectral separation of the stochastic gravitational-wave background for
LISA: galactic, cosmological and astrophysical backgrounds | Contribution to the 2021 Gravitation session of the 55th Rencontres
de Moriond | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In its observation band, the Laser Interferometer Space Antenna (LISA) will
simultaneously observe stochastic gravitational-wave background (SGWB) signals
of different origins; orbitally modulated waveforms from galactic white dwarf
binaries, a binary black hole produced background, and possibly a
cosmologically prod... | [
{
"created": "Fri, 14 May 2021 12:29:07 GMT",
"version": "v1"
},
{
"created": "Mon, 17 May 2021 12:45:55 GMT",
"version": "v2"
}
] | 2021-05-18 | [
[
"Boileau",
"Guillaume",
""
],
[
"Lamberts",
"Astrid",
""
],
[
"Christensen",
"Nelson",
""
],
[
"Cornish",
"Neil J.",
""
],
[
"Meyer",
"Renate",
""
]
] | In its observation band, the Laser Interferometer Space Antenna (LISA) will simultaneously observe stochastic gravitational-wave background (SGWB) signals of different origins; orbitally modulated waveforms from galactic white dwarf binaries, a binary black hole produced background, and possibly a cosmologically produc... |
gr-qc/0401088 | Hernando Quevedo | Hernando Quevedo and Julio G. Tafoya | Towards the deformation quantization of linearized gravity | 13 pages, no figures **preliminary entry *** | Gen.Rel.Grav. 37 (2005) 2083-2092 | 10.1007/s10714-005-0193-x | null | gr-qc | null | We present a first attempt to apply the approach of deformation quantization
to linearized Einstein's equations. We use the analogy with Maxwell equations
to derive the field equations of linearized gravity from a modified Maxwell
Lagrangian which allows the construction of a Hamiltonian in the standard way.
The defo... | [
{
"created": "Wed, 21 Jan 2004 01:15:13 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Quevedo",
"Hernando",
""
],
[
"Tafoya",
"Julio G.",
""
]
] | We present a first attempt to apply the approach of deformation quantization to linearized Einstein's equations. We use the analogy with Maxwell equations to derive the field equations of linearized gravity from a modified Maxwell Lagrangian which allows the construction of a Hamiltonian in the standard way. The deform... |
0805.2124 | T. P. Singh | T. P. Singh | Noncommutative gravity, a `no strings attached' quantum-classical
duality, and the cosmological constant puzzle | 7 pages. Second Prize in Gravity Research Foundation Essay
Competition, 2008. Two paragraphs added to original essay to enhance clarity.
To appear in Gen. Rel. Grav | Gen.Rel.Grav.40:2037-2042,2008 | 10.1007/s10714-008-0670-0 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There ought to exist a reformulation of quantum mechanics which does not
refer to an external classical spacetime manifold. Such a reformulation can be
achieved using the language of noncommutative differential geometry. A
consequence which follows is that the `weakly quantum, strongly gravitational'
dynamics of a re... | [
{
"created": "Wed, 14 May 2008 18:04:30 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Singh",
"T. P.",
""
]
] | There ought to exist a reformulation of quantum mechanics which does not refer to an external classical spacetime manifold. Such a reformulation can be achieved using the language of noncommutative differential geometry. A consequence which follows is that the `weakly quantum, strongly gravitational' dynamics of a rela... |
2105.03751 | Xiankai Pang | Daniele Oriti, Xiankai Pang | Phantom-like dark energy from quantum gravity | 53 pages, 5 figures; several typos fixed and references added | null | 10.1088/1475-7516/2021/12/040 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse the emergent cosmological dynamics corresponding to the mean field
hydrodynamics of quantum gravity condensates, in the tensorial group field
theory formalism. We focus in particular on the cosmological effects of
fundamental interactions, and on the contributions from different quantum
geometric modes. Th... | [
{
"created": "Sat, 8 May 2021 17:53:33 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Jun 2021 09:00:54 GMT",
"version": "v2"
}
] | 2022-01-05 | [
[
"Oriti",
"Daniele",
""
],
[
"Pang",
"Xiankai",
""
]
] | We analyse the emergent cosmological dynamics corresponding to the mean field hydrodynamics of quantum gravity condensates, in the tensorial group field theory formalism. We focus in particular on the cosmological effects of fundamental interactions, and on the contributions from different quantum geometric modes. The ... |
gr-qc/0401020 | Noriko Shiiki | Noriko Shiiki, Nobuyuki Sawado, Takashi Torii, Kei-ichi Maeda | Regular and Black Hole Skyrmions with Axisymmetry | 8 pages, 8 figures, typos corrected | Gen.Rel.Grav. 36 (2004) 1361-1371 | 10.1023/B:GERG.0000022392.89396.4b | null | gr-qc hep-th | null | It has been known that a B=2 skyrmion is axially symmetric. We consider the
Skyrme model coupled to gravity and obtain static axially symmetric regular and
black hole solutions numerically. Computing the energy density of the skyrmion,
we discuss the effect of gravity to the energy density and baryon density of
the s... | [
{
"created": "Wed, 7 Jan 2004 16:14:57 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Feb 2004 07:42:01 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Shiiki",
"Noriko",
""
],
[
"Sawado",
"Nobuyuki",
""
],
[
"Torii",
"Takashi",
""
],
[
"Maeda",
"Kei-ichi",
""
]
] | It has been known that a B=2 skyrmion is axially symmetric. We consider the Skyrme model coupled to gravity and obtain static axially symmetric regular and black hole solutions numerically. Computing the energy density of the skyrmion, we discuss the effect of gravity to the energy density and baryon density of the sky... |
1711.08026 | Luisa Jaime | Luisa G. Jaime and Marcelo Salgado | Cosmic acceleration in asymptotically Ricci flat Universe | 12 pages, 18 figures in 9 panels | Phys. Rev. D 98, 084045 (2018) | 10.1103/PhysRevD.98.084045 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the evolution of a Friedmann-Robertson-Walker spacetime within the
framework of $f(R)$ metric gravity using an exponential model. We show that
$f(R)$ gravity may lead to a vanishing effective cosmological constant in the
far future (i.e. $R\rightarrow 0$) and yet produce a transient accelerated
expansion a... | [
{
"created": "Tue, 21 Nov 2017 20:33:04 GMT",
"version": "v1"
}
] | 2018-10-31 | [
[
"Jaime",
"Luisa G.",
""
],
[
"Salgado",
"Marcelo",
""
]
] | We analyze the evolution of a Friedmann-Robertson-Walker spacetime within the framework of $f(R)$ metric gravity using an exponential model. We show that $f(R)$ gravity may lead to a vanishing effective cosmological constant in the far future (i.e. $R\rightarrow 0$) and yet produce a transient accelerated expansion at ... |
1907.00379 | Hirotaka Yuzurihara | Hirotaka Yuzurihara, Shuhei Mano, Hideyuki Tagoshi | A nonparametric method to assess significance of events in search for
gravitational waves with false discovery rate | Accepted by PTEP, 18 pages, 8 figure | Progress of Theoretical and Experimental Physics, Volume 2021,
Issue 12, December 2021, 123F01 | 10.1093/ptep/ptab137 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we present a consistent procedure to assess the significance
of gravitational wave events observed by laser interferometric gravitational
wave detectors based on the background distribution of detection statistic. We
propose a non-parametric method to estimate $p$-value. Based on the estimated
$p$-valu... | [
{
"created": "Sun, 30 Jun 2019 13:14:47 GMT",
"version": "v1"
},
{
"created": "Sun, 9 Feb 2020 07:21:18 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Oct 2021 10:08:55 GMT",
"version": "v3"
}
] | 2023-08-07 | [
[
"Yuzurihara",
"Hirotaka",
""
],
[
"Mano",
"Shuhei",
""
],
[
"Tagoshi",
"Hideyuki",
""
]
] | In this paper, we present a consistent procedure to assess the significance of gravitational wave events observed by laser interferometric gravitational wave detectors based on the background distribution of detection statistic. We propose a non-parametric method to estimate $p$-value. Based on the estimated $p$-values... |
0902.1746 | Ari Peltola | A. Peltola and G. Kunstatter | Effective Polymer Dynamics of D-Dimensional Black Hole Interiors | 14 pages, 4 figures. Added discussion about the dependency on
auxiliary structures. Matches with the published version | Phys.Rev.D80:044031,2009 | 10.1103/PhysRevD.80.044031 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider two different effective polymerization schemes applied to
D-dimensional, spherically symmetric black hole interiors. It is shown that
polymerization of the generalized area variable alone leads to a complete,
regular, single-horizon spacetime in which the classical singularity is
replaced by a bounce. The... | [
{
"created": "Tue, 10 Feb 2009 21:16:55 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Sep 2009 22:00:14 GMT",
"version": "v2"
}
] | 2009-09-04 | [
[
"Peltola",
"A.",
""
],
[
"Kunstatter",
"G.",
""
]
] | We consider two different effective polymerization schemes applied to D-dimensional, spherically symmetric black hole interiors. It is shown that polymerization of the generalized area variable alone leads to a complete, regular, single-horizon spacetime in which the classical singularity is replaced by a bounce. The b... |
1408.5644 | Luis Granda | L. N. Granda | A Viable model for modified gravity | 17 pages | null | 10.1007/s10509-014-2178-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a model for modified gravity that meets the conditions of
viability. The model has stable constant curvature solution and for an special
case contains flat space time solution. The model also leads to matter
stability under small perturbations of scalar curvature. We give an example of
restrictions on the ... | [
{
"created": "Mon, 25 Aug 2014 00:13:12 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Granda",
"L. N.",
""
]
] | We propose a model for modified gravity that meets the conditions of viability. The model has stable constant curvature solution and for an special case contains flat space time solution. The model also leads to matter stability under small perturbations of scalar curvature. We give an example of restrictions on the pa... |
1904.12555 | Dilek Kazici \c{C}iftci | Dilek K. \c{C}iftci and Ali Demir\"ozl\"u | Embedding the stationary spacetimes into Brans-Dicke cosmology via
conformal transformations | 17 Pages | 6th International Conference on Mathematical Advances and
Applications (ICOMAA-2023), 6(1), pp. 52--59 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A conformal transformation of a static or stationary spacetime by a time
dependent conformal scale factor ${S(\tau )}^2$ is one of the methods of
producing a cosmological spacetime. Using this knowledge and Brans-Dicke (BD)
field equations, we investigate two time dependent metrics, including
Friedmann-Lemaitre-Rober... | [
{
"created": "Mon, 29 Apr 2019 10:57:12 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Oct 2019 10:09:34 GMT",
"version": "v2"
},
{
"created": "Thu, 6 Feb 2020 10:44:54 GMT",
"version": "v3"
},
{
"created": "Mon, 9 Aug 2021 13:46:30 GMT",
"version": "v4"
},
{
"cre... | 2023-12-07 | [
[
"Çiftci",
"Dilek K.",
""
],
[
"Demirözlü",
"Ali",
""
]
] | A conformal transformation of a static or stationary spacetime by a time dependent conformal scale factor ${S(\tau )}^2$ is one of the methods of producing a cosmological spacetime. Using this knowledge and Brans-Dicke (BD) field equations, we investigate two time dependent metrics, including Friedmann-Lemaitre-Roberts... |
gr-qc/0309045 | Eric Gourgoulhon | Keisuke Taniguchi, Eric Gourgoulhon | Various features of quasiequilibrium sequences of binary neutron stars
in general relativity | Text improved, some figures changed or deleted, new table, 38 pages,
31 figures, accepted for publication in Phys. Rev. D | Phys.Rev. D68 (2003) 124025 | 10.1103/PhysRevD.68.124025 | null | gr-qc astro-ph | null | Quasiequilibrium sequences of binary neutron stars are numerically calculated
in the framework of the Isenberg-Wilson-Mathews (IWM) approximation of general
relativity. The results are presented for both rotation states of synchronized
spins and irrotational motion, the latter being considered as the realistic one
fo... | [
{
"created": "Mon, 8 Sep 2003 12:39:20 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Oct 2003 15:09:14 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Taniguchi",
"Keisuke",
""
],
[
"Gourgoulhon",
"Eric",
""
]
] | Quasiequilibrium sequences of binary neutron stars are numerically calculated in the framework of the Isenberg-Wilson-Mathews (IWM) approximation of general relativity. The results are presented for both rotation states of synchronized spins and irrotational motion, the latter being considered as the realistic one for ... |
0805.1187 | Jorge Pullin | Rodolfo Gambini and Jorge Pullin | Black holes in loop quantum gravity: the complete space-time | 4 pages, 2 figures | Phys.Rev.Lett.101:161301,2008 | 10.1103/PhysRevLett.101.161301 | LSU-REL-050808 | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the quantization of the complete extension of the Schwarzschild
space-time using spherically symmetric loop quantum gravity. We find an exact
solution corresponding to the semi-classical theory. The singularity is
eliminated but the space-time still contains a horizon. Although the solution
is known parti... | [
{
"created": "Thu, 8 May 2008 16:03:06 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Gambini",
"Rodolfo",
""
],
[
"Pullin",
"Jorge",
""
]
] | We consider the quantization of the complete extension of the Schwarzschild space-time using spherically symmetric loop quantum gravity. We find an exact solution corresponding to the semi-classical theory. The singularity is eliminated but the space-time still contains a horizon. Although the solution is known partial... |
1401.3164 | A. Tawfik | Eiman Abou El Dahab (WLCAPP, Cairo and MTI U., Cairo) and Abdel Nasser
Tawfik (Egyptian Ctr. Theor. Phys., Cairo and WLCAPP, Cairo) | Measurable Maximal Energy and Minimal Time Interval | 16 pages, 0 figure | null | 10.1139/cjp-2013-0661 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The possibility of finding the measurable maximal energy and the minimal time
interval is discussed in different quantum aspects. It is found that the linear
generalized uncertainty principle (GUP) approach gives a non-physical result.
Based on large scale Schwarzshild solution, the quadratic GUP approach is
utilized... | [
{
"created": "Tue, 14 Jan 2014 12:41:10 GMT",
"version": "v1"
}
] | 2014-06-11 | [
[
"Dahab",
"Eiman Abou El",
"",
"WLCAPP, Cairo and MTI U., Cairo"
],
[
"Tawfik",
"Abdel Nasser",
"",
"Egyptian Ctr. Theor. Phys., Cairo and WLCAPP, Cairo"
]
] | The possibility of finding the measurable maximal energy and the minimal time interval is discussed in different quantum aspects. It is found that the linear generalized uncertainty principle (GUP) approach gives a non-physical result. Based on large scale Schwarzshild solution, the quadratic GUP approach is utilized. ... |
gr-qc/9612030 | null | Giorgio Immirzi | Real and complex connections for canonical gravity | 8 pages, RevTeX, no figures | Class.Quant.Grav.14:L177-L181,1997 | 10.1088/0264-9381/14/10/002 | DFUP-118/96 | gr-qc | null | Both real and complex connections have been used for canonical gravity: the
complex connection has SL(2,C) as gauge group, while the real connection has
SU(2) as gauge group. We show that there is an arbitrary parameter $\beta$
which enters in the definition of the real connection, in the Poisson brackets,
and theref... | [
{
"created": "Thu, 12 Dec 1996 13:58:55 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Immirzi",
"Giorgio",
""
]
] | Both real and complex connections have been used for canonical gravity: the complex connection has SL(2,C) as gauge group, while the real connection has SU(2) as gauge group. We show that there is an arbitrary parameter $\beta$ which enters in the definition of the real connection, in the Poisson brackets, and therefor... |
gr-qc/0003001 | Jose Wadih Maluf | K. H. Castello-Branco and J. W. Maluf | On the selection of triads in the teleparallel geometry and Bondi's
radiating metric | Latex, 27 pages, no figures | null | null | null | gr-qc | null | A consistent Hamiltonian formulation of the teleparallel equivalent of
general relativity (TEGR) requires the theory to be invariant under the global
SO(3) symmetry group, which acts on orthonormal triads in three-dimensional
spacelike hypersurfaces. In the TEGR it is possible to make definite statements
about the en... | [
{
"created": "Wed, 1 Mar 2000 19:11:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Castello-Branco",
"K. H.",
""
],
[
"Maluf",
"J. W.",
""
]
] | A consistent Hamiltonian formulation of the teleparallel equivalent of general relativity (TEGR) requires the theory to be invariant under the global SO(3) symmetry group, which acts on orthonormal triads in three-dimensional spacelike hypersurfaces. In the TEGR it is possible to make definite statements about the ener... |
2404.15839 | Carsten Gundlach | Carsten Gundlach, Thomas W. Baumgarte and David Hilditch | Simulations of gravitational collapse in null coordinates: II. Critical
collapse of an axisymmetric scalar field | null | Phys. Rev. D 110, 024019 (2024) | 10.1103/PhysRevD.110.024019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the first numerical simulations in null coordinates of the
collapse of nonspherical regular initial data to a black hole. We restrict to
twist-free axisymmetry, and re-investigate the critical collapse of a
non-spherical massless scalar field. We find that the Choptuik solution
governing scalar field criti... | [
{
"created": "Wed, 24 Apr 2024 12:28:11 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Jun 2024 19:03:13 GMT",
"version": "v2"
}
] | 2024-07-11 | [
[
"Gundlach",
"Carsten",
""
],
[
"Baumgarte",
"Thomas W.",
""
],
[
"Hilditch",
"David",
""
]
] | We present the first numerical simulations in null coordinates of the collapse of nonspherical regular initial data to a black hole. We restrict to twist-free axisymmetry, and re-investigate the critical collapse of a non-spherical massless scalar field. We find that the Choptuik solution governing scalar field critica... |
1902.08504 | Tichomir Tenev | T. G. Tenev and M. F. Horstemeyer | Dark matter effect attributed to the inherent structure of cosmic space | null | International Journal of Modern Physics D (2019) 1950082 | 10.1142/S0218271819500822 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose that anomalous gravitational effects currently attributed to dark
matter can alternatively be explained as a manifestation of the inherent
structure of space at galactic length scales. Specifically, we show that the
inherent curvature of space amplifies the gravity of ordinary matter such that
the effect r... | [
{
"created": "Thu, 21 Feb 2019 18:50:23 GMT",
"version": "v1"
}
] | 2019-02-25 | [
[
"Tenev",
"T. G.",
""
],
[
"Horstemeyer",
"M. F.",
""
]
] | We propose that anomalous gravitational effects currently attributed to dark matter can alternatively be explained as a manifestation of the inherent structure of space at galactic length scales. Specifically, we show that the inherent curvature of space amplifies the gravity of ordinary matter such that the effect res... |
1012.6025 | Adam Szereszewski | A. Szereszewski, J. Tafel, M. Jakimowicz | D-dimensional metrics with D-3 symmetries | 8 pages | Int. J. Theor. Phys. 51 (5), 1360-1369 (2012) | 10.1007/s10773-011-1011-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hidden symmetry transformations of D-dimensional vacuum metrics with D-3
commuting Killing vectors are studied. We solve directly the Einstein equations
in the Maison formulation under additional assumptions. We relate the
4-dimensional Reissner-Nordstr\"om solution to a particular case of the
5-dimensional Gross-Per... | [
{
"created": "Wed, 29 Dec 2010 20:35:50 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Feb 2011 10:33:38 GMT",
"version": "v2"
}
] | 2016-02-12 | [
[
"Szereszewski",
"A.",
""
],
[
"Tafel",
"J.",
""
],
[
"Jakimowicz",
"M.",
""
]
] | Hidden symmetry transformations of D-dimensional vacuum metrics with D-3 commuting Killing vectors are studied. We solve directly the Einstein equations in the Maison formulation under additional assumptions. We relate the 4-dimensional Reissner-Nordstr\"om solution to a particular case of the 5-dimensional Gross-Perry... |
1804.11218 | Roberto Casadio | Rehana Rahim, Andrea Giusti, Roberto Casadio | The marginally trapped surfaces in spheroidal spacetimes | 16 pages in REVTeX format, 1 figure, with streamlined calculation of
expansion scalars. Title changed. arXiv admin note: text overlap with
arXiv:1801.05621 | International Journal of Modern Physics D Vol. 28, No. 1 (2019)
1950021 | 10.1142/S0218271819500214 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the location of marginally trapped surfaces in space-times resulting
from an axial deformation of static isotropic systems, and show that the
Misner-Sharp mass evaluated on the corresponding undeformed spherically
symmetric space provides the correct gravitational radius to locate the
spheroidal horizon.
| [
{
"created": "Fri, 27 Apr 2018 16:03:47 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Aug 2018 13:11:59 GMT",
"version": "v2"
},
{
"created": "Mon, 21 Jan 2019 10:07:34 GMT",
"version": "v3"
}
] | 2019-01-24 | [
[
"Rahim",
"Rehana",
""
],
[
"Giusti",
"Andrea",
""
],
[
"Casadio",
"Roberto",
""
]
] | We study the location of marginally trapped surfaces in space-times resulting from an axial deformation of static isotropic systems, and show that the Misner-Sharp mass evaluated on the corresponding undeformed spherically symmetric space provides the correct gravitational radius to locate the spheroidal horizon. |
2302.08753 | James Wheeler | James Wheeler | Seeking Dark Signals in Oscillating Redshifts: Exploring Geometric
Scalar Field Dark Matter | 18 pages; 5 figures | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We detail a novel theoretical prediction that a geometric torsion model for
scalar field dark matter could lead to oscillations, on readily probeable
timescales, in the time evolution of cosmological redshifts of astronomical
sources with qualitatively distinct behavior at different redshift scales
(larger or smaller... | [
{
"created": "Fri, 17 Feb 2023 08:31:19 GMT",
"version": "v1"
}
] | 2023-02-20 | [
[
"Wheeler",
"James",
""
]
] | We detail a novel theoretical prediction that a geometric torsion model for scalar field dark matter could lead to oscillations, on readily probeable timescales, in the time evolution of cosmological redshifts of astronomical sources with qualitatively distinct behavior at different redshift scales (larger or smaller t... |
gr-qc/0512087 | Vojt\v{e}ch Pravda | V. Pravda | On the algebraic classification of spacetimes | Submitted to Journal of Physics, conference series, proceedings of
4th meeting on constrained dynamics and quantum gravity, 12-16 September
2005, Sardinia, Italy | J.Phys.Conf.Ser.33:463-468,2006 | 10.1088/1742-6596/33/1/060 | null | gr-qc | null | We briefly overview the Petrov classification in four dimensions and its
generalization to higher dimensions.
| [
{
"created": "Thu, 15 Dec 2005 10:00:05 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Pravda",
"V.",
""
]
] | We briefly overview the Petrov classification in four dimensions and its generalization to higher dimensions. |
2211.00932 | Omar Mustafa | Omar Mustafa | PDM Klein-Gordon particles in Som-Raychaudhuri cosmic string spacetime
with space-like dislocation and a non-uniform magnetic field: spacetime
associated degeneracies, vorticity-energy, and charge-energy correlations | 15 pages 3 figures | International Journal of Geometric Methods in Modern Physics, 20
(2023) 2350221 | 10.1142/S0219887823502213 | null | gr-qc math-ph math.MP quant-ph | http://creativecommons.org/licenses/by/4.0/ | We explicitly study and report the effects of the gravitational fields on the
spectroscopic structure of Klein-Gordon (KG) particles in Som-Raychaudhuri
cosmic string spacetime with space-like dislocation and a non-uniform magnetic
field. We extend this study to include the effects of the gravitational fields
on some... | [
{
"created": "Wed, 2 Nov 2022 07:39:19 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Feb 2023 15:59:31 GMT",
"version": "v2"
}
] | 2023-10-17 | [
[
"Mustafa",
"Omar",
""
]
] | We explicitly study and report the effects of the gravitational fields on the spectroscopic structure of Klein-Gordon (KG) particles in Som-Raychaudhuri cosmic string spacetime with space-like dislocation and a non-uniform magnetic field. We extend this study to include the effects of the gravitational fields on some p... |
gr-qc/0001082 | Fay | Stephane Fay | Dynamical study of the empty Bianchi type I model in generalised
scalar-tensor theory | 18 pages, 3 figures, to appear in General Relativity and Gravitation | Gen.Rel.Grav. 32 (2000) 203-220 | 10.1023/A:1001871024041 | null | gr-qc | null | A dynamical study of the generalised scalar-tensor theory in the empty
Bianchi type I model is made. We use a method from which we derive the sign of
the first and second derivatives of the metric functions and examine three
different theories that can all tend towards relativistic behaviours at late
time. We determi... | [
{
"created": "Tue, 25 Jan 2000 18:24:18 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Fay",
"Stephane",
""
]
] | A dynamical study of the generalised scalar-tensor theory in the empty Bianchi type I model is made. We use a method from which we derive the sign of the first and second derivatives of the metric functions and examine three different theories that can all tend towards relativistic behaviours at late time. We determine... |
1007.3127 | Tatyana P. Shestakova | T. P. Shestakova | On canonical transformations of gravitational variables in extended
phase space | 7 pages, talk presented at the International Conference "Modern
problems of Gravitation, Cosmology and Relativistic Astrophysics", Moscow, 27
June - 3 July 2010 | Grav.Cosmol.17:67-70,2011 | 10.1134/S0202289311010191 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Last years a certain attention was attracted to the statement that
Hamiltonian formulations of General Relativity, in which different
parametrizations of gravitational variables were used, may not be related by a
canonical transformation. The example was given by the Hamiltonian formulation
of Dirac and that of Arnow... | [
{
"created": "Mon, 19 Jul 2010 11:55:35 GMT",
"version": "v1"
}
] | 2011-03-28 | [
[
"Shestakova",
"T. P.",
""
]
] | Last years a certain attention was attracted to the statement that Hamiltonian formulations of General Relativity, in which different parametrizations of gravitational variables were used, may not be related by a canonical transformation. The example was given by the Hamiltonian formulation of Dirac and that of Arnowit... |
1505.01069 | Oldrich Semerak | O. Semer\'ak, M. \v{S}r\'amek | Spinning particles in vacuum spacetimes of different curvature types | 20 pages, no figures | Phys. Rev. D 92, 064032 (2015) | 10.1103/PhysRevD.92.064032 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the motion of spinning test particles with nonzero rest mass in
the "pole-dipole" approximation, as described by the Mathisson-Papapetrou-Dixon
(MPD) equations, and examine its properties in dependence on the spin
supplementary condition added to close the system. The MPD equation of motion
is decomposed ... | [
{
"created": "Tue, 5 May 2015 16:25:12 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Sep 2015 21:33:20 GMT",
"version": "v2"
}
] | 2015-09-25 | [
[
"Semerák",
"O.",
""
],
[
"Šrámek",
"M.",
""
]
] | We consider the motion of spinning test particles with nonzero rest mass in the "pole-dipole" approximation, as described by the Mathisson-Papapetrou-Dixon (MPD) equations, and examine its properties in dependence on the spin supplementary condition added to close the system. The MPD equation of motion is decomposed in... |
gr-qc/0307031 | Mattias Marklund | J.T. Mendonca, V. Cardoso, M. Marklund, M. Servin, G. Brodin | Self-phase modulation of spherical gravitational waves | 11 pages | Phys.Rev. D68 (2003) 084025 | 10.1103/PhysRevD.68.084025 | null | gr-qc astro-ph | null | Self-phase modulation of spherical gravitational wavepackets propagating in a
flat space-time in the presence of a tenuous distribution of matter is
considered. Analogies with respect to similar effects in nonlinear optics are
explored. Self phase modulation of waves emitted from a single source can
eventually lead t... | [
{
"created": "Tue, 8 Jul 2003 14:17:23 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Mendonca",
"J. T.",
""
],
[
"Cardoso",
"V.",
""
],
[
"Marklund",
"M.",
""
],
[
"Servin",
"M.",
""
],
[
"Brodin",
"G.",
""
]
] | Self-phase modulation of spherical gravitational wavepackets propagating in a flat space-time in the presence of a tenuous distribution of matter is considered. Analogies with respect to similar effects in nonlinear optics are explored. Self phase modulation of waves emitted from a single source can eventually lead to ... |
1405.3171 | Savelova Elena P. Dr. | E.P. Savelova, A.A. Kirillov | On the possibility of the generation of an artificial wormhole | text overlap with arXiv:1204.0351 but essential changes are added.
arXiv admin note: text overlap with arXiv:1405.1977 | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We model spacetime foam by a gas of virtual wormholes. Then applying an
external field one may change the density of virtual wormholes and try to
organize a wormhole-like structure in space. The relation between an additional
distribution of virtual wormholes and the external field is considered for the
homogeneous c... | [
{
"created": "Mon, 12 May 2014 12:06:55 GMT",
"version": "v1"
}
] | 2014-05-14 | [
[
"Savelova",
"E. P.",
""
],
[
"Kirillov",
"A. A.",
""
]
] | We model spacetime foam by a gas of virtual wormholes. Then applying an external field one may change the density of virtual wormholes and try to organize a wormhole-like structure in space. The relation between an additional distribution of virtual wormholes and the external field is considered for the homogeneous cas... |
gr-qc/0601079 | Alessandro Fabbri | R. Balbinot, A. Fabbri, S. Fagnocchi and R. Parentani | Hawking Radiation from Acoustic Black Holes, Short Distance and
Back-Reaction Effects | 60 pages, 6 figures. Review submitted to "La Rivista del Nuovo
Cimento" | Riv.Nuovo Cim. 28 (2005) 1-55 | null | null | gr-qc cond-mat.other hep-th | null | Using the action principle we first review how linear density perturbations
(sound waves) in an Eulerian fluid obey a relativistic equation: the d'Alembert
equation. This analogy between propagation of sound and that of a massless
scalar field in a Lorentzian metric also applies to non-homogeneous flows. In
these cas... | [
{
"created": "Thu, 19 Jan 2006 11:40:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Balbinot",
"R.",
""
],
[
"Fabbri",
"A.",
""
],
[
"Fagnocchi",
"S.",
""
],
[
"Parentani",
"R.",
""
]
] | Using the action principle we first review how linear density perturbations (sound waves) in an Eulerian fluid obey a relativistic equation: the d'Alembert equation. This analogy between propagation of sound and that of a massless scalar field in a Lorentzian metric also applies to non-homogeneous flows. In these cases... |
2307.05204 | Jan Niklas Reinhardt | Jan Niklas Reinhardt, Martin Staab, Kohei Yamamoto, Jean-Baptiste
Bayle, Aur\'elien Hees, Olaf Hartwig, Karsten Wiesner, Sweta Shah, Gerhard
Heinzel | Ranging Sensor Fusion in LISA Data Processing: Treatment of Ambiguities,
Noise, and On-Board Delays in LISA Ranging Observables | null | Phys. Rev. D 109, 022004 (2024) | 10.1103/PhysRevD.109.022004 | null | gr-qc astro-ph.IM | http://creativecommons.org/licenses/by/4.0/ | Interspacecraft ranging is crucial for the suppression of laser frequency
noise via time-delay interferometry (TDI). So far, the effects of on-board
delays and ambiguities on the LISA ranging observables were neglected in LISA
modelling and data processing investigations. In reality, on-board delays cause
offsets and... | [
{
"created": "Tue, 11 Jul 2023 12:19:44 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Dec 2023 10:23:19 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Jan 2024 11:42:47 GMT",
"version": "v3"
}
] | 2024-01-17 | [
[
"Reinhardt",
"Jan Niklas",
""
],
[
"Staab",
"Martin",
""
],
[
"Yamamoto",
"Kohei",
""
],
[
"Bayle",
"Jean-Baptiste",
""
],
[
"Hees",
"Aurélien",
""
],
[
"Hartwig",
"Olaf",
""
],
[
"Wiesner",
"Karsten",
""
... | Interspacecraft ranging is crucial for the suppression of laser frequency noise via time-delay interferometry (TDI). So far, the effects of on-board delays and ambiguities on the LISA ranging observables were neglected in LISA modelling and data processing investigations. In reality, on-board delays cause offsets and t... |
gr-qc/9512010 | Edgardo Salomon Cheb Terrab | H. P. de Oliveira and E.S. Cheb-Terrab, DFT-UERJ, Brazil | Self-Similar Collapse of Conformally Coupled Scalar Fields | 9 pages, accepted for publication, Classical and Quantum Gravity.
Available at http://dft.if.uerj.br/preprint/e-17.tex or at
ftp://dft.if.uerj.br/preprint/e-17.tex . Figures can be obtained on request
at dft-uerj@vmesa.uerj.br | Class.Quant.Grav. 13 (1996) 425-432 | 10.1088/0264-9381/13/3/010 | IF-UERJ-95-17 | gr-qc | null | A massless scalar field minimally coupled to the gravitational field in a
simplified spherical symmetry is discussed. It is shown that, in this case, the
solution found by Roberts, describing a scalar field collapse, is in fact the
most general one. Taking that solution as departure point, a study of the
gravitationa... | [
{
"created": "Tue, 5 Dec 1995 23:07:01 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"de Oliveira",
"H. P.",
""
],
[
"Cheb-Terrab",
"E. S.",
""
],
[
"DFT-UERJ",
"",
""
],
[
"Brazil",
"",
""
]
] | A massless scalar field minimally coupled to the gravitational field in a simplified spherical symmetry is discussed. It is shown that, in this case, the solution found by Roberts, describing a scalar field collapse, is in fact the most general one. Taking that solution as departure point, a study of the gravitational ... |
2002.08360 | Arun Mathew | Arun Mathew and Malay Kumar Nandy | Existence of Chandrasekhar's limit in GUP white dwarfs | null | null | 10.1098/rsos.210301 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Various recent theoretical investigations suggest that gravitational collapse
of white dwarfs is withheld for arbitrarily high masses if the equation of
state is described by the generalized uncertainty principle (GUP). There have
been a few attempts to restore the Chandrasekhar limit but they are found to be
inadequ... | [
{
"created": "Wed, 19 Feb 2020 16:25:05 GMT",
"version": "v1"
}
] | 2021-06-14 | [
[
"Mathew",
"Arun",
""
],
[
"Nandy",
"Malay Kumar",
""
]
] | Various recent theoretical investigations suggest that gravitational collapse of white dwarfs is withheld for arbitrarily high masses if the equation of state is described by the generalized uncertainty principle (GUP). There have been a few attempts to restore the Chandrasekhar limit but they are found to be inadequat... |
2309.14669 | Andronikos Paliathanasis | Andronikos Paliathanasis | Symmetric teleparallel cosmology with boundary corrections | 24 pages, 2 figures | null | null | null | gr-qc hep-ph math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | We investigate the geometrodynamical effects of introducing the boundary term
in symmetric teleparallel gravity. Specifically, we consider a homogeneous and
isotropic universe in $f\left( Q, B \right) $, where $Q$ is the non-metricity
scalar, and $B$ is the boundary term that relates the non-metricity and Ricci
scala... | [
{
"created": "Tue, 26 Sep 2023 04:48:01 GMT",
"version": "v1"
}
] | 2023-09-27 | [
[
"Paliathanasis",
"Andronikos",
""
]
] | We investigate the geometrodynamical effects of introducing the boundary term in symmetric teleparallel gravity. Specifically, we consider a homogeneous and isotropic universe in $f\left( Q, B \right) $, where $Q$ is the non-metricity scalar, and $B$ is the boundary term that relates the non-metricity and Ricci scalars... |
2303.10847 | Fiona Helen Panther | Fiona H. Panther, Paul D. Lasky | The effect of noise artefacts on gravitational-wave searches for neutron
star post-merger remnants | 6 pages, 4 figures, submitted for publication in Monthly Notices of
the Royal Astronomical Society | null | 10.1093/mnras/stad1556 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waves from binary neutron star post-merger remnants have the
potential to uncover the physics of the hot nuclear equation of state. These
gravitational-wave signals are high frequency ($\sim$ kHz) and short lived
($\mathcal{O}(10\,\mathrm{ms})$), which introduces potential problems for
data-analysis alg... | [
{
"created": "Mon, 20 Mar 2023 03:44:36 GMT",
"version": "v1"
}
] | 2023-05-31 | [
[
"Panther",
"Fiona H.",
""
],
[
"Lasky",
"Paul D.",
""
]
] | Gravitational waves from binary neutron star post-merger remnants have the potential to uncover the physics of the hot nuclear equation of state. These gravitational-wave signals are high frequency ($\sim$ kHz) and short lived ($\mathcal{O}(10\,\mathrm{ms})$), which introduces potential problems for data-analysis algor... |
gr-qc/9906050 | Chris Van Den Broeck | Chris Van Den Broeck | On the (im)possibility of warp bubbles | Summary of talk delivered at STAIF-2000 | null | null | KUL-TF-99/22 | gr-qc | null | Various objections against Alcubierre's warp drive geometry are reviewed.
Superluminal warp bubbles seem an unlikey possibility within the framework of
general relativity and quantum field theory, although subluminal bubbles may
still be possible.
| [
{
"created": "Tue, 15 Jun 1999 13:49:27 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Jun 1999 10:44:37 GMT",
"version": "v2"
},
{
"created": "Mon, 12 Jul 1999 13:10:43 GMT",
"version": "v3"
},
{
"created": "Thu, 18 May 2000 17:28:09 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"Broeck",
"Chris Van Den",
""
]
] | Various objections against Alcubierre's warp drive geometry are reviewed. Superluminal warp bubbles seem an unlikey possibility within the framework of general relativity and quantum field theory, although subluminal bubbles may still be possible. |
1805.01106 | Jinhua Wang | Jinhua Wang | Future stability of the $1+3$ Milne model for Einstein-Klein-Gordon
system | The scale-free variables including the rescaled mass (1.5) for the
Klein Gordon field are used to make the estimates uniform (Thanks to the
suggestions from an anonymous referee); More reference and remark are added;
e.g. Remark 3.10 (P.18) confirms the inevitability of the borderline terms
arising in the KG eq... | null | 10.1088/1361-6382/ab4dd3 | null | gr-qc math-ph math.AP math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the small perturbations of the $1+3$-dimensional Milne model for the
Einstein-Klein-Gordon (EKG) system. We prove the nonlinear future stability,
and show that the perturbed spacetimes are future causally geodesically
complete. For the proof, we work within the constant mean curvature (CMC) gauge
and focus o... | [
{
"created": "Thu, 3 May 2018 03:59:29 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Jan 2019 03:32:58 GMT",
"version": "v2"
}
] | 2020-01-08 | [
[
"Wang",
"Jinhua",
""
]
] | We study the small perturbations of the $1+3$-dimensional Milne model for the Einstein-Klein-Gordon (EKG) system. We prove the nonlinear future stability, and show that the perturbed spacetimes are future causally geodesically complete. For the proof, we work within the constant mean curvature (CMC) gauge and focus on ... |
0806.1167 | Michael Bebronne | Michael V. Bebronne | Instantaneous interaction in massive gravity | null | Phys.Lett.B668:432-437,2008 | 10.1016/j.physletb.2008.09.008 | ULB-TH/08-20 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In general relativity, the instantaneous contributions to the gravitational
potentials cancel each other in observable, leaving the theory free of physical
instantaneous interactions. In models where these subtle cancellations are
spoiled by the presence of fields that break Lorentz invariance, physical
instantaneous... | [
{
"created": "Fri, 6 Jun 2008 14:23:18 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Oct 2008 07:42:09 GMT",
"version": "v2"
}
] | 2010-05-12 | [
[
"Bebronne",
"Michael V.",
""
]
] | In general relativity, the instantaneous contributions to the gravitational potentials cancel each other in observable, leaving the theory free of physical instantaneous interactions. In models where these subtle cancellations are spoiled by the presence of fields that break Lorentz invariance, physical instantaneous i... |
gr-qc/0501097 | Soumen Basak | Soumen Basak | Analog of Superradiance effect in BEC | 12 pages, No figure | null | null | null | gr-qc | null | We investigate the scattering of phase oscillation of Bose-Einstein
Condensate by a 'draining of bathtub' type fluid motion. We derive a relation
between the reflection and transmission coefficients which exhibits existence
of analog of 'Superradiance effect' in BEC vortex with sink.
| [
{
"created": "Sun, 30 Jan 2005 15:24:18 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Basak",
"Soumen",
""
]
] | We investigate the scattering of phase oscillation of Bose-Einstein Condensate by a 'draining of bathtub' type fluid motion. We derive a relation between the reflection and transmission coefficients which exhibits existence of analog of 'Superradiance effect' in BEC vortex with sink. |
2310.16064 | Serge Parnovsky | S. Parnovsky | Vacuum solutions of Einstein equations that depend on one coordinate | 2 pages | Bulletin of Taras Shevchenko National University of Kyiv.
Astronomy, Vol. 62, P. 10-11 (2020) | 10.17721/BTSNUA.2020.62.10-11 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the famous textbook written by Landau and Lifshitz all the vacuum metrics
of the general theory of relativity are derived, which depend on one coordinate
in the absence of a cosmological constant. Unfortunately, when considering
these solutions, the authors missed some of the possible solutions discussed in
this a... | [
{
"created": "Tue, 24 Oct 2023 11:08:08 GMT",
"version": "v1"
}
] | 2023-10-26 | [
[
"Parnovsky",
"S.",
""
]
] | In the famous textbook written by Landau and Lifshitz all the vacuum metrics of the general theory of relativity are derived, which depend on one coordinate in the absence of a cosmological constant. Unfortunately, when considering these solutions, the authors missed some of the possible solutions discussed in this art... |
gr-qc/9511035 | null | G. Giachetta and G.Sardanashvily | Dirac Equation in Gauge and Affine-Metric Gravitation Theories | 10 pp, LaTeX file | Int.J.Theor.Phys. 36 (1997) 125-142 | null | MPH/CAM/107/95 | gr-qc hep-th | null | We show that the covariant derivative of Dirac fermion fields in the presence
of a general linear connection on a world manifold is universal for Einstein's,
gauge and affine-metric gravitation theories.
| [
{
"created": "Fri, 10 Nov 1995 17:59:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Giachetta",
"G.",
""
],
[
"Sardanashvily",
"G.",
""
]
] | We show that the covariant derivative of Dirac fermion fields in the presence of a general linear connection on a world manifold is universal for Einstein's, gauge and affine-metric gravitation theories. |
gr-qc/0105084 | Luca Lusanna | R. De Pietri (Parma-Univ), L. Lusanna (INFN, Firenze), L. Martucci
(Milano1-Univ), and S. Russo (Lugano) | Dirac's Observables for the Rest-Frame Instant Form of Tetrad Gravity in
a Completely Fixed 3-Orthogonal Gauge | RevTeX file, 141 pages | Gen.Rel.Grav. 34 (2002) 877-1033 | 10.1023/A:1016369931750 | null | gr-qc | null | We define the {\it rest-frame instant form} of tetrad gravity restricted to
Christodoulou-Klainermann spacetimes. After a study of the Hamiltonian group of
gauge transformations generated by the 14 first class constraints of the
theory, we define and solve the multitemporal equations associated with the
rotation and ... | [
{
"created": "Wed, 23 May 2001 14:06:57 GMT",
"version": "v1"
}
] | 2021-10-20 | [
[
"De Pietri",
"R.",
"",
"Parma-Univ"
],
[
"Lusanna",
"L.",
"",
"INFN, Firenze"
],
[
"Martucci",
"L.",
"",
"Milano1-Univ"
],
[
"Russo",
"S.",
"",
"Lugano"
]
] | We define the {\it rest-frame instant form} of tetrad gravity restricted to Christodoulou-Klainermann spacetimes. After a study of the Hamiltonian group of gauge transformations generated by the 14 first class constraints of the theory, we define and solve the multitemporal equations associated with the rotation and sp... |
1406.4189 | Miquel Pinyol Ribas | Miquel Pinol | A Model of Dustlike Spherically Symmetric Gravitational Collapse without
Event Horizon Formation | 10 pages. arXiv admin note: text overlap with arXiv:1007.2734 by
other authors | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Some dynamical aspects of gravitational collapse are explored in this paper.
A time-dependent spherically symmetric metric is proposed and the corresponding
Einstein field equations are derived. An ultrarelativistic dust-like
stress-momentum tensor is considered to obtain analytical solutions of these
equations, with... | [
{
"created": "Mon, 16 Jun 2014 23:02:55 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Jul 2014 21:57:44 GMT",
"version": "v2"
}
] | 2014-07-08 | [
[
"Pinol",
"Miquel",
""
]
] | Some dynamical aspects of gravitational collapse are explored in this paper. A time-dependent spherically symmetric metric is proposed and the corresponding Einstein field equations are derived. An ultrarelativistic dust-like stress-momentum tensor is considered to obtain analytical solutions of these equations, with a... |
2403.06867 | Antonina Zinhailo | Antonina F. Zinhailo | Exploring Unique Quasinormal Modes of a Massive Scalar Field in
Brane-World Scenarios | 7 pages, 5 figures, 2 tables | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute precise values of quasinormal modes of a massive scalar field in
the background of the Schwarzschild-like brane-localised black holes. It is
shown that the quasinormal spectrum of the massive field differs qualitatively
from that previously known for other black hole models, due to the presence of
two kind... | [
{
"created": "Mon, 11 Mar 2024 16:21:55 GMT",
"version": "v1"
}
] | 2024-03-12 | [
[
"Zinhailo",
"Antonina F.",
""
]
] | We compute precise values of quasinormal modes of a massive scalar field in the background of the Schwarzschild-like brane-localised black holes. It is shown that the quasinormal spectrum of the massive field differs qualitatively from that previously known for other black hole models, due to the presence of two kinds ... |
2111.04323 | Carlos Albertho Benavides-Gallego | Carlos A. Benavides-Gallego and Wen-Biao Han | Phenomenological model for the electromagnetic response of a black hole
binary immersed in magnetic field | 20 pages, 8 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Electromagnetic counterparts of gravitational wave events usually involve
neutron stars during compact binary coalescences. On the other hand, the
community generally believes that electromagnetic emissions are hardly
generated during the mergers of binary black holes. Nevertheless, some authors
have considered the p... | [
{
"created": "Mon, 8 Nov 2021 08:27:56 GMT",
"version": "v1"
}
] | 2021-11-09 | [
[
"Benavides-Gallego",
"Carlos A.",
""
],
[
"Han",
"Wen-Biao",
""
]
] | Electromagnetic counterparts of gravitational wave events usually involve neutron stars during compact binary coalescences. On the other hand, the community generally believes that electromagnetic emissions are hardly generated during the mergers of binary black holes. Nevertheless, some authors have considered the pos... |
2312.13028 | Shubham Kejriwal | Shubham Kejriwal, Lorenzo Speri, Alvin J. K. Chua | Impact of Correlations on the Modeling and Inference of Beyond Vacuum-GR
Effects in Extreme-Mass-Ratio Inspirals | 6 + 3 pages, 3 figures | null | null | null | gr-qc astro-ph.HE astro-ph.IM | http://creativecommons.org/licenses/by-nc-sa/4.0/ | In gravitational-wave astronomy, extreme-mass-ratio-inspiral (EMRI) sources
for the upcoming LISA observatory have the potential to serve as high-precision
probes of astrophysical environments in galactic nuclei, and of potential
deviations from general relativity (GR). Such ``beyond vacuum-GR'' effects are
often mod... | [
{
"created": "Wed, 20 Dec 2023 13:51:07 GMT",
"version": "v1"
}
] | 2023-12-21 | [
[
"Kejriwal",
"Shubham",
""
],
[
"Speri",
"Lorenzo",
""
],
[
"Chua",
"Alvin J. K.",
""
]
] | In gravitational-wave astronomy, extreme-mass-ratio-inspiral (EMRI) sources for the upcoming LISA observatory have the potential to serve as high-precision probes of astrophysical environments in galactic nuclei, and of potential deviations from general relativity (GR). Such ``beyond vacuum-GR'' effects are often model... |
gr-qc/0511026 | J. R. Brownstein | J. R. Brownstein and J. W. Moffat | Gravitational solution to the Pioneer 10/11 anomaly | 14 pages, 3 figures, 3 tables. typo's were corrected at Equations (4)
and (12) and a third table including our predictions for the anomalous
perihelion advance of the planets was added | Class.Quant.Grav.23:3427-3436,2006 | 10.1088/0264-9381/23/10/013 | null | gr-qc astro-ph | null | A fully relativistic modified gravitational theory including a fifth force
skew symmetric field is fitted to the Pioneer 10/11 anomalous acceleration. The
theory allows for a variation with distance scales of the gravitational
constant G, the fifth force skew symmetric field coupling strength omega and
the mass of th... | [
{
"created": "Sun, 6 Nov 2005 02:40:04 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Mar 2006 19:20:20 GMT",
"version": "v2"
},
{
"created": "Fri, 17 Mar 2006 21:22:19 GMT",
"version": "v3"
},
{
"created": "Sat, 13 May 2006 15:57:56 GMT",
"version": "v4"
},
{
"cr... | 2008-11-26 | [
[
"Brownstein",
"J. R.",
""
],
[
"Moffat",
"J. W.",
""
]
] | A fully relativistic modified gravitational theory including a fifth force skew symmetric field is fitted to the Pioneer 10/11 anomalous acceleration. The theory allows for a variation with distance scales of the gravitational constant G, the fifth force skew symmetric field coupling strength omega and the mass of the ... |
2210.10795 | Hideki Maeda | Hideki Maeda | Vacuum-dual static perfect fluid obeying $p=-(n-3)\rho/(n+1)$ in $n(\ge
4)$ dimensions | 32 pages, 3 figures, 5 tables; v2, published version in Classical and
Quantum Gravity | Class.Quant.Grav. 40 (2023) 8, 085014 | 10.1088/1361-6382/acc3f1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain the general $n(\ge 4)$-dimensional static solution with an
$(n-2)$-dimensional Einstein base manifold for a perfect fluid obeying a linear
equation of state $p=-(n-3)\rho/(n+1)$. It is a generalization of Semiz's
four-dimensional general solution with spherical symmetry and consists of two
different classes... | [
{
"created": "Wed, 19 Oct 2022 18:00:02 GMT",
"version": "v1"
},
{
"created": "Sat, 18 Mar 2023 02:19:25 GMT",
"version": "v2"
}
] | 2023-04-21 | [
[
"Maeda",
"Hideki",
""
]
] | We obtain the general $n(\ge 4)$-dimensional static solution with an $(n-2)$-dimensional Einstein base manifold for a perfect fluid obeying a linear equation of state $p=-(n-3)\rho/(n+1)$. It is a generalization of Semiz's four-dimensional general solution with spherical symmetry and consists of two different classes. ... |
gr-qc/0003089 | Remo Garattini | Remo Garattini | A Spacetime Foam Approach to the Schwarzschild-de Sitter Entropy | Published in Entropy 2000, 2, 26-38, www.mdpi.org/entropy/ | Entropy 2 (2000) 26-38 | 10.3390/e2010026 | null | gr-qc hep-th | null | The entropy for a black hole in a de Sitter space is approached within the
framework of spacetime foam. A simple model, made by $N$ wormholes in a
semiclassical approximation, is taken under examination to compute the entropy
for such a case. An extension to the extreme case when the black hole and
cosmological horiz... | [
{
"created": "Wed, 22 Mar 2000 19:08:39 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Garattini",
"Remo",
""
]
] | The entropy for a black hole in a de Sitter space is approached within the framework of spacetime foam. A simple model, made by $N$ wormholes in a semiclassical approximation, is taken under examination to compute the entropy for such a case. An extension to the extreme case when the black hole and cosmological horizon... |
0910.1933 | Hamid Reza Sepangi | A. Borzou, H. R. Sepangi, S. shahidi and R. Yousefi | Brane $f(\cal R)$ gravity | 8 pages, 2 figures, to appear in EPL | Europhys.Lett.88:29001,2009 | 10.1209/0295-5075/88/29001 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a brane world scenario in which the bulk action is assumed to
have the form of a generic function of the Ricci scalar $f(\mathcal{R})$ and
derive the resulting Einstein field equations on the brane. In a constant
curvature bulk a conserved geometric quantity appears in the field equations
which can be ass... | [
{
"created": "Sat, 10 Oct 2009 17:56:49 GMT",
"version": "v1"
}
] | 2013-08-13 | [
[
"Borzou",
"A.",
""
],
[
"Sepangi",
"H. R.",
""
],
[
"shahidi",
"S.",
""
],
[
"Yousefi",
"R.",
""
]
] | We consider a brane world scenario in which the bulk action is assumed to have the form of a generic function of the Ricci scalar $f(\mathcal{R})$ and derive the resulting Einstein field equations on the brane. In a constant curvature bulk a conserved geometric quantity appears in the field equations which can be assoc... |
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