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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1107.1440 | Wolfgang Tichy | Wolfgang Tichy | Initial data for binary neutron stars with arbitrary spins | 9 pages | Phys.Rev.D84:024041,2011 | 10.1103/PhysRevD.84.024041 | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In general neutron stars in binaries are spinning. Due to the existence of
millisecond pulsars we know that these spins can be substantial. We argue that
spins with periods on the order a few dozen milliseconds could influence the
late inspiral and merger dynamics. Thus numerical simulations of the last few
orbits an... | [
{
"created": "Thu, 7 Jul 2011 16:23:15 GMT",
"version": "v1"
}
] | 2011-08-11 | [
[
"Tichy",
"Wolfgang",
""
]
] | In general neutron stars in binaries are spinning. Due to the existence of millisecond pulsars we know that these spins can be substantial. We argue that spins with periods on the order a few dozen milliseconds could influence the late inspiral and merger dynamics. Thus numerical simulations of the last few orbits and ... |
0902.0230 | Parthasarathi Mitra | Bhramar Chatterjee, P. Mitra | Hawking temperature and higher order calculations | 4 pages; minor changes; comments added about fermions; comment about
an 'maginary contribution included at the instance of PLB | Phys.Lett.B675:240-242,2009 | 10.1016/j.physletb.2009.04.009 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hawking radiation has recently been explained by using solutions of wave
equations across black hole horizons in a WKB approximation. Higher order
calculations using both usual and non-singular coordinates are found to change
the solution for zero spin, but this change is not an alteration of the Hawking
temperature.... | [
{
"created": "Mon, 2 Feb 2009 09:28:27 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Feb 2009 12:13:28 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Feb 2009 10:40:57 GMT",
"version": "v3"
},
{
"created": "Thu, 9 Apr 2009 05:30:30 GMT",
"version": "v4"
}
] | 2011-03-28 | [
[
"Chatterjee",
"Bhramar",
""
],
[
"Mitra",
"P.",
""
]
] | Hawking radiation has recently been explained by using solutions of wave equations across black hole horizons in a WKB approximation. Higher order calculations using both usual and non-singular coordinates are found to change the solution for zero spin, but this change is not an alteration of the Hawking temperature. F... |
gr-qc/0404051 | Julio Cesar Fabris | F.G. Alvarenga, A.B. Batista, J.C. Fabris and G.T. Marques | Quantum modes around a scalar-tensor black hole: breakdown of the
normalization conditions | Latex file, 6 pages. To appear in Gravitation&Cosmology | Grav.Cosmol. 10 (2004) 184-186 | null | null | gr-qc hep-th | null | Black holes arising in the context of scalar-tensor gravity theories, where
the scalar field is non-minimally coupled to the curvature term, have zero
surface gravity. Hence, it is generally stated that their Hawking temperature
is zero, irrespectivelly of their gravitational and scalar charges. The proper
analysis o... | [
{
"created": "Mon, 12 Apr 2004 20:06:16 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Alvarenga",
"F. G.",
""
],
[
"Batista",
"A. B.",
""
],
[
"Fabris",
"J. C.",
""
],
[
"Marques",
"G. T.",
""
]
] | Black holes arising in the context of scalar-tensor gravity theories, where the scalar field is non-minimally coupled to the curvature term, have zero surface gravity. Hence, it is generally stated that their Hawking temperature is zero, irrespectivelly of their gravitational and scalar charges. The proper analysis of ... |
2004.03228 | Yuri Pavlov | A. A. Grib, Yu. V. Pavlov | Particle properties outside of the static limit in cosmology | 4 pages | Int. J. Mod. Phys. A 35 (2020) 2040044 | 10.1142/S0217751X20400448 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that in the rest frame of the observer in expanding Universe
states of particles with negative energy exist.The properties of such states
are studied. The comparison with the case of negative energies of particles in
black holes and rotating coordinates out of the static limit is made.
| [
{
"created": "Tue, 7 Apr 2020 09:45:33 GMT",
"version": "v1"
}
] | 2020-04-08 | [
[
"Grib",
"A. A.",
""
],
[
"Pavlov",
"Yu. V.",
""
]
] | It is shown that in the rest frame of the observer in expanding Universe states of particles with negative energy exist.The properties of such states are studied. The comparison with the case of negative energies of particles in black holes and rotating coordinates out of the static limit is made. |
1701.00748 | Evan Halstead | G. Vardiashvili, E. Halstead, R. Poltis, A. Morgan, and D. Tobar | Inflationary Constraints on the Van der Waals Equation of State | null | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In spite of the strong observational evidence suggesting a period of rapid
expansion in the early universe, the identity of the inflaton field that drove
this expansion remains elusive. Many inflaton candidate particles (both known
and hypothesized) have been proposed to explain the early accelerated expansion
of the... | [
{
"created": "Tue, 3 Jan 2017 17:08:22 GMT",
"version": "v1"
}
] | 2017-01-04 | [
[
"Vardiashvili",
"G.",
""
],
[
"Halstead",
"E.",
""
],
[
"Poltis",
"R.",
""
],
[
"Morgan",
"A.",
""
],
[
"Tobar",
"D.",
""
]
] | In spite of the strong observational evidence suggesting a period of rapid expansion in the early universe, the identity of the inflaton field that drove this expansion remains elusive. Many inflaton candidate particles (both known and hypothesized) have been proposed to explain the early accelerated expansion of the u... |
gr-qc/0402080 | M. Raiteri | M. Francaviglia, M. Raiteri | Boundary Conditions, Energies and Gravitational Heat in General
Relativity (a Classical Analysis) | Latex file, 31 pages; one reference and two comments added, misprints
corrected | Class.Quant.Grav. 21 (2004) 3459-3482 | 10.1088/0264-9381/21/14/010 | null | gr-qc hep-th | null | The variation of the energy for a gravitational system is directly defined
from the Hamiltonian field equations of General Relativity. When the variation
of the energy is written in a covariant form it splits into two (covariant)
contributions: one of them is the Komar energy, while the other is the
so-called covaria... | [
{
"created": "Wed, 18 Feb 2004 14:28:58 GMT",
"version": "v1"
},
{
"created": "Tue, 25 May 2004 08:17:38 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Francaviglia",
"M.",
""
],
[
"Raiteri",
"M.",
""
]
] | The variation of the energy for a gravitational system is directly defined from the Hamiltonian field equations of General Relativity. When the variation of the energy is written in a covariant form it splits into two (covariant) contributions: one of them is the Komar energy, while the other is the so-called covariant... |
2110.04807 | Takeshi Tomitsuka | Takeshi Tomitsuka and Koji Yamaguchi | Modification of a Lie-algebra-based approach and its application to
asymptotic symmetries on a Killing horizon | 21 pages, 1 figure | Prog Theor Exp Phys (2022) | 10.1093/ptep/ptac046 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a new approach to find asymptotic symmetries in general relativity
as a modification of the Lie-algebra-based approach proposed in T. Tomitsuka et
al. [Classical Quantum Gravity 38, 225007 (2021)]. Those authors proposed an
algorithmic protocol to investigate asymptotic symmetries. In particular, their
gui... | [
{
"created": "Sun, 10 Oct 2021 14:32:53 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Apr 2022 13:38:50 GMT",
"version": "v2"
}
] | 2022-04-20 | [
[
"Tomitsuka",
"Takeshi",
""
],
[
"Yamaguchi",
"Koji",
""
]
] | We develop a new approach to find asymptotic symmetries in general relativity as a modification of the Lie-algebra-based approach proposed in T. Tomitsuka et al. [Classical Quantum Gravity 38, 225007 (2021)]. Those authors proposed an algorithmic protocol to investigate asymptotic symmetries. In particular, their guidi... |
gr-qc/0504103 | Muhammad Sharif | M. Sharif and Sehar Aziz | Kinematic Self-Similar Cylindrically Symmetric Solutions | 22 pages, accepted for publication in Int. J. of Mod. Phys. D | Int.J.Mod.Phys. D14 (2005) 1527-1544 | 10.1142/S0218271805007115 | null | gr-qc | null | This paper is devoted to find out cylindrically symmetric kinematic
self-similar perfect fluid and dust solutions. We study the cylindrically
symmetric solutions which admit kinematic self-similar vectors of second,
zeroth and infinite kinds, not only for the tilted fluid case but also for the
parallel and orthogonal... | [
{
"created": "Thu, 21 Apr 2005 09:31:48 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Sharif",
"M.",
""
],
[
"Aziz",
"Sehar",
""
]
] | This paper is devoted to find out cylindrically symmetric kinematic self-similar perfect fluid and dust solutions. We study the cylindrically symmetric solutions which admit kinematic self-similar vectors of second, zeroth and infinite kinds, not only for the tilted fluid case but also for the parallel and orthogonal c... |
2311.16634 | Georgios Lukes-Gerakopoulos | Morteza Kerachian, Sajal Mukherjee, Georgios Lukes-Gerakopoulos, and
Sanjit Mitra | Detectability of stochastic gravitational wave background from weakly
hyperbolic encounters | 8 pages, 3 figures, 1 table | Astronomy & Astrophysics 684: A17 (2024) | 10.1051/0004-6361/202348747 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the stochastic gravitational wave (GW) background generated by
black hole-black hole (BH-BH) hyperbolic encounters with eccentricities close
to one and compare them with the respective sensitivity curves of planned GW
detectors. We use the Keplerian potential to model the orbits of the encounters
and the q... | [
{
"created": "Tue, 28 Nov 2023 09:37:24 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Apr 2024 09:31:13 GMT",
"version": "v2"
}
] | 2024-04-03 | [
[
"Kerachian",
"Morteza",
""
],
[
"Mukherjee",
"Sajal",
""
],
[
"Lukes-Gerakopoulos",
"Georgios",
""
],
[
"Mitra",
"Sanjit",
""
]
] | We compute the stochastic gravitational wave (GW) background generated by black hole-black hole (BH-BH) hyperbolic encounters with eccentricities close to one and compare them with the respective sensitivity curves of planned GW detectors. We use the Keplerian potential to model the orbits of the encounters and the qua... |
2201.10732 | M.J. Luo | M.J.Luo | Local Conformal Instability and Local Non-Collapsing in the Ricci flow
of Quantum Spacetime | 14 pages. v2:introduction and references added, appendix moved to
section-II, generalization of the Ricci flow and the monotonic functionals to
the Lorentzian 4-spacetime emphasized. Final version published in Annals of
Physics. arXiv admin note: text overlap with arXiv:2112.00218 | Annals of Physics 441 (2022) 168861 | 10.1016/j.aop.2022.168861 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is known that the conformal instability or bottomless problem rises in the
path integral method in quantizing the general relativity. Does quantum
spacetime itself really suffer from such conformal instability? If so, does the
conformal instability cause the collapse of local spacetime region or even
collapse the ... | [
{
"created": "Wed, 26 Jan 2022 03:29:41 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Apr 2022 10:44:44 GMT",
"version": "v2"
}
] | 2022-04-19 | [
[
"Luo",
"M. J.",
""
]
] | It is known that the conformal instability or bottomless problem rises in the path integral method in quantizing the general relativity. Does quantum spacetime itself really suffer from such conformal instability? If so, does the conformal instability cause the collapse of local spacetime region or even collapse the wh... |
2309.09712 | Misbah Shahzadi | Misbah Shahzadi, Martin Kolo\v{s}, Rabia Saleem and Zden\v{e}k
Stuchl\'ik | Testing alternative spacetimes by high-frequency quasi-periodic
oscillations observed in microquasars and active galactic nuclei | 19 pages, 6 figures, 1 table | Classical and Quantum Gravity, 41, 075014, (2024) | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this article, we try to capture the influence of deviation from standard
Kerr black hole spacetime on observed high-frequency quasi-periodic
oscillations signal. We explore the dynamics of test particles in the field of
rotating compact objects governed by the various modifications of the standard
Kerr black hole ... | [
{
"created": "Mon, 18 Sep 2023 12:28:13 GMT",
"version": "v1"
}
] | 2024-03-19 | [
[
"Shahzadi",
"Misbah",
""
],
[
"Kološ",
"Martin",
""
],
[
"Saleem",
"Rabia",
""
],
[
"Stuchlík",
"Zdeněk",
""
]
] | In this article, we try to capture the influence of deviation from standard Kerr black hole spacetime on observed high-frequency quasi-periodic oscillations signal. We explore the dynamics of test particles in the field of rotating compact objects governed by the various modifications of the standard Kerr black hole sp... |
1105.6200 | Paul Tod | Paul Tod | A comment on positive mass for scalar field sources | 6 pages | General Relativity and Gravitation, 2011, Volume 43, Number 6,
1855-1860 | 10.1007/s10714-011-1165-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use a transformation due to Bekenstein to relate the ADM and Bondi masses
of asymptotically-flat solutions of the Einstein equations with, respectively,
scalar sources and conformal-scalar sources. Although the conformal-scalar
energy-momentum tensor does not satisfy the Dominant Energy Condition one may,
by this ... | [
{
"created": "Tue, 31 May 2011 08:30:27 GMT",
"version": "v1"
}
] | 2011-06-01 | [
[
"Tod",
"Paul",
""
]
] | We use a transformation due to Bekenstein to relate the ADM and Bondi masses of asymptotically-flat solutions of the Einstein equations with, respectively, scalar sources and conformal-scalar sources. Although the conformal-scalar energy-momentum tensor does not satisfy the Dominant Energy Condition one may, by this me... |
gr-qc/9607039 | John F. Donoghue | John F.Donoghue (University of Massachusetts, Amherst) | The Quantum Theory of General Relativity at Low Energies | 9 pages, Latex, talk presented at Journees Relativistes 96, Ascona,
Switzerland, May 1996. To be published in Helv. Phys. Acta | Helv.Phys.Acta 69 (1996) 269-275 | null | null | gr-qc hep-th | null | In quantum field theory there is now a well developed technique, effective
field theory, which allows one to obtain low energy quantum predictions in
``non-renormalizable'' theories, using only the degrees of freedom and
interactions appropriate for those energies. Whether or not general relativity
is truly fundament... | [
{
"created": "Wed, 17 Jul 1996 14:12:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Donoghue",
"John F.",
"",
"University of Massachusetts, Amherst"
]
] | In quantum field theory there is now a well developed technique, effective field theory, which allows one to obtain low energy quantum predictions in ``non-renormalizable'' theories, using only the degrees of freedom and interactions appropriate for those energies. Whether or not general relativity is truly fundamental... |
2406.08699 | Andrei Galiautdinov | Andrei Galiautdinov | Positive-energy Dirac particles in cosmology | 7 pages, no figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide general relativistic treatment of the single-component field
described by Dirac's positive-energy wave equation of 1971. It is motivated by
Bogomolny's proposal to regard that field as a possible candidate for dark
matter. Our emphasis is on standard (flat) Friedmann-Robertson-Walker
cosmology. The early u... | [
{
"created": "Wed, 12 Jun 2024 23:43:02 GMT",
"version": "v1"
},
{
"created": "Sun, 4 Aug 2024 22:03:55 GMT",
"version": "v2"
}
] | 2024-08-06 | [
[
"Galiautdinov",
"Andrei",
""
]
] | We provide general relativistic treatment of the single-component field described by Dirac's positive-energy wave equation of 1971. It is motivated by Bogomolny's proposal to regard that field as a possible candidate for dark matter. Our emphasis is on standard (flat) Friedmann-Robertson-Walker cosmology. The early uni... |
2104.07134 | Kentaro Mogushi | Kentaro Mogushi | Application of a new transient-noise analysis tool for an unmodeled
gravitational-wave search pipeline | 19 pages, 12 figures, 1 table | Classical and Quantum Gravity 38 (2021) 155004 | 10.1088/1361-6382/ac08a7 | LIGO-P2100031 | gr-qc astro-ph.IM | http://creativecommons.org/licenses/by/4.0/ | Excess transient noise events, or glitches, impact the data quality of
ground-based ravitational-wave (GW) detectors and impair the detection of
signals produced by astrophysical sources. Identification of the causes of
these glitches is a crucial starting point for the improvement of GW signal
detectability. However... | [
{
"created": "Wed, 14 Apr 2021 21:37:01 GMT",
"version": "v1"
}
] | 2021-07-19 | [
[
"Mogushi",
"Kentaro",
""
]
] | Excess transient noise events, or glitches, impact the data quality of ground-based ravitational-wave (GW) detectors and impair the detection of signals produced by astrophysical sources. Identification of the causes of these glitches is a crucial starting point for the improvement of GW signal detectability. However, ... |
gr-qc/9406033 | null | Sean A. Hayward | Spin-Coefficient Form of the New Laws of Black-Hole Dynamics | 9 pages | Class.Quant.Grav.11:3025-3036,1994 | 10.1088/0264-9381/11/12/016 | null | gr-qc | null | General laws of black-hole dynamics, some of which are analogous to the laws
of thermodynamics, have recently been found for a general definition of black
hole in terms of a future outer trapping horizon, a hypersurface foliated by
marginal surfaces of a certain type. This theory is translated here into
spin-coeffici... | [
{
"created": "Tue, 21 Jun 1994 07:35:09 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Hayward",
"Sean A.",
""
]
] | General laws of black-hole dynamics, some of which are analogous to the laws of thermodynamics, have recently been found for a general definition of black hole in terms of a future outer trapping horizon, a hypersurface foliated by marginal surfaces of a certain type. This theory is translated here into spin-coefficien... |
gr-qc/0404097 | Dmitriy Palatnik | Dmitriy Palatnik | BI action for gravitational and electroweak fields | 11 pages, 0 figures | null | null | null | gr-qc hep-th | null | This note suggests a generalization of the Born--Infeld action (1932) on case
of electroweak and gravitational fields in four-dimensional spacetime. The
action is constructed from Dirac matrices, $\gamma_a$, and dimensionless
covariant derivatives, $\pi_{a} = - i\ell \nabla_{a}$, where $\ell$ is of order
of magnitude... | [
{
"created": "Thu, 22 Apr 2004 01:25:29 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Apr 2004 12:59:05 GMT",
"version": "v2"
},
{
"created": "Wed, 28 Apr 2004 22:59:19 GMT",
"version": "v3"
},
{
"created": "Fri, 15 Oct 2004 19:34:16 GMT",
"version": "v4"
},
{
"c... | 2007-05-23 | [
[
"Palatnik",
"Dmitriy",
""
]
] | This note suggests a generalization of the Born--Infeld action (1932) on case of electroweak and gravitational fields in four-dimensional spacetime. The action is constructed from Dirac matrices, $\gamma_a$, and dimensionless covariant derivatives, $\pi_{a} = - i\ell \nabla_{a}$, where $\ell$ is of order of magnitude o... |
gr-qc/9612015 | David Garfinkle | David Garfinkle | Choptuik scaling and the scale invariance of Einstein's equation | references added and discussion modified | Phys.Rev.D56:3169-3173,1997 | 10.1103/PhysRevD.56.3169 | null | gr-qc | null | The relationship of Choptuik scaling to the scale invariance of Einstein's
equation is explored. Ordinary dynamical systems often have limit cycles:
periodic orbits that are the asymptotic limit of generic solutions. We show how
to separate Einstein's equation into the dynamics of the overall scale and the
dynamics o... | [
{
"created": "Thu, 5 Dec 1996 19:19:07 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Jul 1997 21:35:11 GMT",
"version": "v2"
}
] | 2010-01-06 | [
[
"Garfinkle",
"David",
""
]
] | The relationship of Choptuik scaling to the scale invariance of Einstein's equation is explored. Ordinary dynamical systems often have limit cycles: periodic orbits that are the asymptotic limit of generic solutions. We show how to separate Einstein's equation into the dynamics of the overall scale and the dynamics of ... |
1003.0543 | Mohammad Malekjani | A. Khodam-Mohammadi and M. Malekjani | Cosmic Behavior, Statefinder Diagnostic and $w-w^{\prime}$ Analysis for
Interacting NADE model in Non-flat Universe | 18 pages, 4 figures, Accepted in Astrophysics & Space Science Journal | Astrophys.Space Sci.331:265-273,2011 | 10.1007/s10509-010-0422-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give a brief review of interacting NADE model in non-flat universe. we
study the effect of spatial curvature $\Omega_{k}$, interaction coefficient
$\alpha $ and the main parameter of NADE, $n$, On EoS parameter $w_{d}$ and
deceleration parameter $q$. We obtain a minimum value for $n$ in both early and
present time... | [
{
"created": "Tue, 2 Mar 2010 09:58:07 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Jun 2010 13:51:56 GMT",
"version": "v2"
}
] | 2011-02-03 | [
[
"Khodam-Mohammadi",
"A.",
""
],
[
"Malekjani",
"M.",
""
]
] | We give a brief review of interacting NADE model in non-flat universe. we study the effect of spatial curvature $\Omega_{k}$, interaction coefficient $\alpha $ and the main parameter of NADE, $n$, On EoS parameter $w_{d}$ and deceleration parameter $q$. We obtain a minimum value for $n$ in both early and present time, ... |
2202.01329 | F\'elix-Louis Juli\'e | F\'elix-Louis Juli\'e, Hector O. Silva, Emanuele Berti, Nicol\'as
Yunes | Black hole sensitivities in Einstein-scalar-Gauss-Bonnet gravity | 20 pages, 12 figures | null | 10.1103/PhysRevD.105.124031 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The post-Newtonian dynamics of black hole binaries in
Einstein-scalar-Gauss-Bonnet theories of gravity depends on the so-called
"sensitivities", quantities which characterize a black hole's adiabatic
response to the time-dependent scalar field environment sourced by its
companion. In this work, we calculate numerical... | [
{
"created": "Wed, 2 Feb 2022 23:41:43 GMT",
"version": "v1"
}
] | 2022-06-29 | [
[
"Julié",
"Félix-Louis",
""
],
[
"Silva",
"Hector O.",
""
],
[
"Berti",
"Emanuele",
""
],
[
"Yunes",
"Nicolás",
""
]
] | The post-Newtonian dynamics of black hole binaries in Einstein-scalar-Gauss-Bonnet theories of gravity depends on the so-called "sensitivities", quantities which characterize a black hole's adiabatic response to the time-dependent scalar field environment sourced by its companion. In this work, we calculate numerically... |
gr-qc/9602058 | Julio Cesar Fabris | C.E.M. Batista, J.C.Fabris | Scalar Perturbations in a String Inspired Inflationary Scenario | 8 pages, latex file | null | null | null | gr-qc | null | We consider an inflationary model inspired in the low energy limit of string
theory. In this model, the scale factor grows exponentially with time. A
perturbation study is performed, and we show that there is a mode which
displays an exponential growth in the perturbation of the scalar field.
| [
{
"created": "Wed, 28 Feb 1996 16:26:49 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Batista",
"C. E. M.",
""
],
[
"Fabris",
"J. C.",
""
]
] | We consider an inflationary model inspired in the low energy limit of string theory. In this model, the scale factor grows exponentially with time. A perturbation study is performed, and we show that there is a mode which displays an exponential growth in the perturbation of the scalar field. |
0901.0800 | Patrik Sandin | Patrik Sandin | Tilted two-fluid Bianchi type I models | 14 pages, 3 figures | Gen.Rel.Grav.41:2707-2724,2009 | 10.1007/s10714-009-0799-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we investigate expanding Bianchi type I models with two tilted
fluids with the same linear equation of state, characterized by the equation of
state parameter w. Individually the fluids have non-zero energy fluxes w.r.t.
the symmetry surfaces, but these cancel each other because of the Codazzi
constrain... | [
{
"created": "Wed, 7 Jan 2009 10:27:58 GMT",
"version": "v1"
}
] | 2011-12-08 | [
[
"Sandin",
"Patrik",
""
]
] | In this paper we investigate expanding Bianchi type I models with two tilted fluids with the same linear equation of state, characterized by the equation of state parameter w. Individually the fluids have non-zero energy fluxes w.r.t. the symmetry surfaces, but these cancel each other because of the Codazzi constraint.... |
1811.08148 | Cosimo Bambi | Ashutosh Tripathi, Sourabh Nampalliwar, Askar B. Abdikamalov, Dimitry
Ayzenberg, Cosimo Bambi, Thomas Dauser, Javier A. Garcia, Andrea Marinucci | Towards precision tests of general relativity with black hole X-ray
reflection spectroscopy | 10 pages, 7 figures. v2: title slightly changed, arXiv version
shorter than published version | Astrophys.J. 875: 56 (2019) | 10.3847/1538-4357/ab0e7e | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Astrophysical black hole systems are the ideal laboratories for testing
Einstein's theory of gravity in the strong field regime. We have recently
developed a framework which uses the reflection spectrum of black hole systems
to perform precision tests of general relativity by testing the Kerr black hole
hypothesis. I... | [
{
"created": "Tue, 20 Nov 2018 09:39:50 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Apr 2019 00:04:08 GMT",
"version": "v2"
}
] | 2019-04-18 | [
[
"Tripathi",
"Ashutosh",
""
],
[
"Nampalliwar",
"Sourabh",
""
],
[
"Abdikamalov",
"Askar B.",
""
],
[
"Ayzenberg",
"Dimitry",
""
],
[
"Bambi",
"Cosimo",
""
],
[
"Dauser",
"Thomas",
""
],
[
"Garcia",
"Javier A.",... | Astrophysical black hole systems are the ideal laboratories for testing Einstein's theory of gravity in the strong field regime. We have recently developed a framework which uses the reflection spectrum of black hole systems to perform precision tests of general relativity by testing the Kerr black hole hypothesis. In ... |
gr-qc/0612086 | L\'aszl\'o \'A Gergely | L\'aszl\'o \'A. Gergely, Zolt\'an Keresztes, Bal\'azs Mik\'oczi | The second post-Newtonian order generalized Kepler equation | to appear in the Proceedings of the Eleventh Marcel Grossmann Meeting
2006, World Scientific, Singapore (2007) | Proceedings of the Eleventh Marcel Grossmann Meeting 2006, Eds. H
Kleinert, RT Jantzen and R Ruffini, World Scientific, Singapore, p. 2503-2505
(2008) | null | null | gr-qc astro-ph | null | The radial component of the motion of compact binary systems composed of
neutron stars and/or black holes on eccentric orbit is integrated. We consider
all type of perturbations that emerge up to second post-Newtonian order. These
perturbations are either of relativistic origin or are related to the spin,
mass quadru... | [
{
"created": "Wed, 13 Dec 2006 18:38:38 GMT",
"version": "v1"
}
] | 2009-05-15 | [
[
"Gergely",
"László Á.",
""
],
[
"Keresztes",
"Zoltán",
""
],
[
"Mikóczi",
"Balázs",
""
]
] | The radial component of the motion of compact binary systems composed of neutron stars and/or black holes on eccentric orbit is integrated. We consider all type of perturbations that emerge up to second post-Newtonian order. These perturbations are either of relativistic origin or are related to the spin, mass quadrupo... |
2208.05779 | Avik De Dr. | Avik De and Loo Tee How | Comment on "Energy conditions in $f(Q)$ gravity" | Accepted for publication in Phy. Rev. D | null | 10.1103/PhysRevD.106.048501 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In Phys. Rev. D 102, 024057 (2020), the authors studied energy conditions in
$f(Q)$ theory following the same path as researchers handled the energy
conditions in the curvature-based modified gravity theories, like $f(R)$ or
$f(R,G)$ theories. However, the field equations in the $f(Q)$ theory was not
expressed as an ... | [
{
"created": "Wed, 10 Aug 2022 10:56:23 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Aug 2022 08:52:13 GMT",
"version": "v2"
}
] | 2022-09-14 | [
[
"De",
"Avik",
""
],
[
"How",
"Loo Tee",
""
]
] | In Phys. Rev. D 102, 024057 (2020), the authors studied energy conditions in $f(Q)$ theory following the same path as researchers handled the energy conditions in the curvature-based modified gravity theories, like $f(R)$ or $f(R,G)$ theories. However, the field equations in the $f(Q)$ theory was not expressed as an ef... |
0711.1967 | Ilya Gurwich | Aharon Davidson and Ilya Gurwich | Radiation Driven Inflation | 5 (two column) pages, 3 figures | JCAP0806:001,2008 | 10.1088/1475-7516/2008/06/001 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A novel scalar field free approach to cosmic inflation is presented. The
inflationary Universe and the radiation dominated Universe are shown, within
the framework of unified brane cosmology, to be two different phases governed
by one and the same energy density. The phase transition of second order (the
Hubble const... | [
{
"created": "Tue, 13 Nov 2007 12:51:09 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Jun 2008 18:40:53 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Davidson",
"Aharon",
""
],
[
"Gurwich",
"Ilya",
""
]
] | A novel scalar field free approach to cosmic inflation is presented. The inflationary Universe and the radiation dominated Universe are shown, within the framework of unified brane cosmology, to be two different phases governed by one and the same energy density. The phase transition of second order (the Hubble constan... |
0904.4501 | Carlos F. Sopuerta | Carlos F. Sopuerta (ICE, CSIC-IEEC), Nicolas Yunes (Princeton) | Extreme- and Intermediate-Mass Ratio Inspirals in Dynamical Chern-Simons
Modified Gravity | 24 pages, 8 figures, Revtex 4 | Phys.Rev.D80:064006,2009 | 10.1103/PhysRevD.80.064006 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | [abridged] Chern-Simons (CS) modified gravity is a 4D effective theory that
descends both from string theory and loop quantum gravity, and that corrects
the Einstein-Hilbert action by adding the product of a scalar field and the
parity-violating, Pontryagin density. In this theory, the gravitational field
of spinning... | [
{
"created": "Wed, 29 Apr 2009 08:48:10 GMT",
"version": "v1"
}
] | 2009-11-06 | [
[
"Sopuerta",
"Carlos F.",
"",
"ICE, CSIC-IEEC"
],
[
"Yunes",
"Nicolas",
"",
"Princeton"
]
] | [abridged] Chern-Simons (CS) modified gravity is a 4D effective theory that descends both from string theory and loop quantum gravity, and that corrects the Einstein-Hilbert action by adding the product of a scalar field and the parity-violating, Pontryagin density. In this theory, the gravitational field of spinning b... |
1804.03725 | James Rankin | J. E. Rankin | Quaternionic Gauge Transformations and Yang-Mills Fields in Weyl Type
Geometries | 31 pages. The second half of the paper is new material. This uses
some material from arXiv:1101.3606 | null | null | RCTP-1801 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This elementary discussion generalizes a Weyl geometry to allow quaternion
valued gauge transformations and classical Yang-Mills geometric fields. This
development will assume that the symmetric metric tensor is real in some gauge,
and will develop the left and right handed approaches to quaternionic gauge
transforma... | [
{
"created": "Tue, 10 Apr 2018 21:24:13 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Apr 2018 18:02:03 GMT",
"version": "v2"
},
{
"created": "Tue, 29 May 2018 03:25:35 GMT",
"version": "v3"
},
{
"created": "Tue, 23 Oct 2018 16:52:04 GMT",
"version": "v4"
},
{
"c... | 2019-10-10 | [
[
"Rankin",
"J. E.",
""
]
] | This elementary discussion generalizes a Weyl geometry to allow quaternion valued gauge transformations and classical Yang-Mills geometric fields. This development will assume that the symmetric metric tensor is real in some gauge, and will develop the left and right handed approaches to quaternionic gauge transformati... |
gr-qc/9405001 | Andrew Chamblin | Andrew Chamblin, Gary Gibbons, Alan R. Steif | Kinks and Time Machines | 5 pages of text and 3 figures (obtain figures from A. Chamblin at
hachamblin@damtp.cam.ac.uk), DAMTP preprint # R/94/17 (Original submission
was slightly garbled.) | Phys.Rev.D50:2353-2355,1994 | 10.1103/PhysRevD.50.R2353 | null | gr-qc | null | We show that it is not possible to smooth out the metric on the
Deutsch-Politzer time machine to obtain an everywhere non-singular
asymptotically flat Lorentzian metric.
| [
{
"created": "Mon, 2 May 1994 12:54:02 GMT",
"version": "v1"
},
{
"created": "Sat, 7 May 1994 16:24:48 GMT",
"version": "v2"
},
{
"created": "Mon, 9 May 1994 14:53:37 GMT",
"version": "v3"
}
] | 2009-10-07 | [
[
"Chamblin",
"Andrew",
""
],
[
"Gibbons",
"Gary",
""
],
[
"Steif",
"Alan R.",
""
]
] | We show that it is not possible to smooth out the metric on the Deutsch-Politzer time machine to obtain an everywhere non-singular asymptotically flat Lorentzian metric. |
2111.15116 | LVK Publications | The LIGO Scientific Collaboration and the Virgo Collaboration: R.
Abbott, T. D. Abbott, F. Acernese, K. Ackley, C. Adams, N. Adhikari, R. X.
Adhikari, V. B. Adya, C. Affeldt, D. Agarwal, M. Agathos, K. Agatsuma, N.
Aggarwal, O. D. Aguiar, L. Aiello, A. Ain, P. Ajith, S. Albanesi, A. Allocca,
P. A. Altin, A. Ama... | Search of the Early O3 LIGO Data for Continuous Gravitational Waves from
the Cassiopeia A and Vela Jr. Supernova Remnants | 24 pages, 8 figures. To appear in Physical Review D | null | 10.1103/PhysRevD.105.082005 | LIGO-P2100298-v8 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present directed searches for continuous gravitational waves from the
neutron stars in the Cassiopeia A (Cas A) and Vela Jr. supernova remnants. We
carry out the searches in the LIGO data from the first six months of the third
Advanced LIGO and Virgo observing run, using the Weave semi-coherent method,
which sums ... | [
{
"created": "Tue, 30 Nov 2021 04:17:59 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Mar 2022 15:15:40 GMT",
"version": "v2"
}
] | 2022-05-18 | [
[
"The LIGO Scientific Collaboration",
"",
""
],
[
"the Virgo Collaboration",
"",
""
],
[
"Abbott",
"R.",
""
],
[
"Abbott",
"T. D.",
""
],
[
"Acernese",
"F.",
""
],
[
"Ackley",
"K.",
""
],
[
"Adams",
"C.",
""... | We present directed searches for continuous gravitational waves from the neutron stars in the Cassiopeia A (Cas A) and Vela Jr. supernova remnants. We carry out the searches in the LIGO data from the first six months of the third Advanced LIGO and Virgo observing run, using the Weave semi-coherent method, which sums ma... |
gr-qc/9611056 | Chris Chambers | Patrick R. Brady (Caltech), Chris M. Chambers (Montana State), William
Krivan (Tubingen, Penn State) and Pablo Laguna (Penn State) | Telling Tails In The Presence Of A Cosmological Constant | 7 pages (including 10 postscript figures), Revtex, uses epsf.tex and
twocolumn.sty. Submitted to Physical Review D | Phys.Rev. D55 (1997) 7538-7545 | 10.1103/PhysRevD.55.7538 | CGPG-96/11-3 | gr-qc | null | We study the evolution of massless scalar waves propagating on spherically
symmetric spacetimes with a non-zero cosmological constant. Considering test
fields on both Schwarzschild-de Sitter and Reissner-Nordstrom-de Sitter
backgrounds, we demonstrate the existence of exponentially decaying tails at
late times. Inter... | [
{
"created": "Sun, 24 Nov 1996 00:32:34 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Brady",
"Patrick R.",
"",
"Caltech"
],
[
"Chambers",
"Chris M.",
"",
"Montana State"
],
[
"Krivan",
"William",
"",
"Tubingen, Penn State"
],
[
"Laguna",
"Pablo",
"",
"Penn State"
]
] | We study the evolution of massless scalar waves propagating on spherically symmetric spacetimes with a non-zero cosmological constant. Considering test fields on both Schwarzschild-de Sitter and Reissner-Nordstrom-de Sitter backgrounds, we demonstrate the existence of exponentially decaying tails at late times. Interes... |
gr-qc/0003011 | Martin Tajmar | M. Tajmar, C. de Matos | Coupling of Gravitation and Electromagnetism in the Weak Field
Approximation | This work does not reflect the opinion of any official institution | null | null | null | gr-qc | null | Using the weak field approximation, we can express the theory of general
relativity in a Maxwell-type structure comparable to electromagnetism. We find
that every electromagnetic field is coupled to a gravitoelectric and
gravitomagnetic field. Acknowledging the fact that both fields originate from
the same source, th... | [
{
"created": "Fri, 3 Mar 2000 13:25:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Tajmar",
"M.",
""
],
[
"de Matos",
"C.",
""
]
] | Using the weak field approximation, we can express the theory of general relativity in a Maxwell-type structure comparable to electromagnetism. We find that every electromagnetic field is coupled to a gravitoelectric and gravitomagnetic field. Acknowledging the fact that both fields originate from the same source, the ... |
2405.00762 | Homa Shababi | Homa Shababi, Sayani Maity, Prabir Rudra, Ujjal Debnath | The effects of the pole dark energy on gravitational waves | 9 pages, 3 figures | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this paper, we have studied the effects of pole dark energy on the
evolution of gravitational waves. The background evolution of gravitational
waves in a flat FRW universe is considered and its dynamics are studied in the
presence of pole dark energy. Two different potential functions are considered
for the study.... | [
{
"created": "Wed, 1 May 2024 16:05:37 GMT",
"version": "v1"
}
] | 2024-05-03 | [
[
"Shababi",
"Homa",
""
],
[
"Maity",
"Sayani",
""
],
[
"Rudra",
"Prabir",
""
],
[
"Debnath",
"Ujjal",
""
]
] | In this paper, we have studied the effects of pole dark energy on the evolution of gravitational waves. The background evolution of gravitational waves in a flat FRW universe is considered and its dynamics are studied in the presence of pole dark energy. Two different potential functions are considered for the study. U... |
2208.10219 | Mingzhi Wang | Mingzhi Wang, Songbai Chen, Jiliang Jing | Determination of the spin parameter and the inclination angle by the
relativistic images in black hole image | 16 pages, 12 figures | Science China Physics, Mechanics & Astronomy. Volume: 66. Issue:
11. 2023 | 10.1007/s11433-023-2152-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We studied the relativistic images caused by strong gravitational lensing in
Kerr black hole images, which carry some essential signatures about the black
hole space-time. We defined a new celestial coordinates whose origin is the
center of black hole shadow to locate the relativistic images. Under the
influences of ... | [
{
"created": "Mon, 22 Aug 2022 11:58:15 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Dec 2022 06:15:57 GMT",
"version": "v2"
},
{
"created": "Wed, 4 Jan 2023 04:50:44 GMT",
"version": "v3"
}
] | 2023-10-25 | [
[
"Wang",
"Mingzhi",
""
],
[
"Chen",
"Songbai",
""
],
[
"Jing",
"Jiliang",
""
]
] | We studied the relativistic images caused by strong gravitational lensing in Kerr black hole images, which carry some essential signatures about the black hole space-time. We defined a new celestial coordinates whose origin is the center of black hole shadow to locate the relativistic images. Under the influences of th... |
0911.0334 | Nikodem Poplawski | Nikodem Pop{\l}awski | Classical Physics: Spacetime and Fields | 151 pages, 3 figures | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a self-contained introduction to the classical theory of spacetime
and fields. This exposition is based on the most general principles: the
principle of general covariance (relativity) and the principle of least action.
The order of the exposition is: 1. Spacetime (principle of general covariance
and tenso... | [
{
"created": "Mon, 2 Nov 2009 16:32:00 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Jul 2020 21:13:22 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Jan 2024 22:49:58 GMT",
"version": "v3"
}
] | 2024-01-15 | [
[
"Popławski",
"Nikodem",
""
]
] | We present a self-contained introduction to the classical theory of spacetime and fields. This exposition is based on the most general principles: the principle of general covariance (relativity) and the principle of least action. The order of the exposition is: 1. Spacetime (principle of general covariance and tensors... |
2404.01395 | Raimon Luna | Raimon Luna, Miquel Llorens-Monteagudo, Ana Lorenzo-Medina, Juan
Calder\'on Bustillo, Nicolas Sanchis-Gual, Alejandro Torres-Forn\'e, Jos\'e
A. Font, Carlos A. R. Herdeiro, Eugen Radu | Numerical relativity surrogate models for exotic compact objects: the
case of head-on mergers of equal-mass Proca stars | 16 pages, 14 figures. v2: Matches published version | Phys.Rev.D 110 (2024) 2, 024004 | 10.1103/PhysRevD.110.024004 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present several high-accuracy surrogate models for gravitational-wave
signals from equal-mass head-on mergers of Proca stars, computed through the
Newman-Penrose scalar $\psi_4$. We also discuss the current state of the model
extensions to mergers of Proca stars with different masses, and the particular
challenges... | [
{
"created": "Mon, 1 Apr 2024 18:07:18 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jul 2024 16:01:43 GMT",
"version": "v2"
}
] | 2024-07-30 | [
[
"Luna",
"Raimon",
""
],
[
"Llorens-Monteagudo",
"Miquel",
""
],
[
"Lorenzo-Medina",
"Ana",
""
],
[
"Bustillo",
"Juan Calderón",
""
],
[
"Sanchis-Gual",
"Nicolas",
""
],
[
"Torres-Forné",
"Alejandro",
""
],
[
"Font"... | We present several high-accuracy surrogate models for gravitational-wave signals from equal-mass head-on mergers of Proca stars, computed through the Newman-Penrose scalar $\psi_4$. We also discuss the current state of the model extensions to mergers of Proca stars with different masses, and the particular challenges t... |
2203.00957 | Shafqat Ul Islam | Shafqat Ul Islam, Sushant G. Ghosh, Sunil D. Maharaj | Strong gravitational lensing by Bardeen black holes in 4D EGB gravity:
constraints from supermassive black holes | 14 pages, 13 figures, 4 tables, references updated | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Observation indicates that many nearby galaxies host supermassive central
black holes. Modelling Bardeen models in four-dimensional Einstein-Gauss-Bonnet
(4D EGB) gravity, with additional parameters $\tilde{\alpha}$ and charge $q$,
as central black holes in various galaxies, we investigate gravitational
lensing prope... | [
{
"created": "Wed, 2 Mar 2022 09:09:07 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jul 2022 15:20:55 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Jul 2022 14:12:56 GMT",
"version": "v3"
}
] | 2022-07-15 | [
[
"Islam",
"Shafqat Ul",
""
],
[
"Ghosh",
"Sushant G.",
""
],
[
"Maharaj",
"Sunil D.",
""
]
] | Observation indicates that many nearby galaxies host supermassive central black holes. Modelling Bardeen models in four-dimensional Einstein-Gauss-Bonnet (4D EGB) gravity, with additional parameters $\tilde{\alpha}$ and charge $q$, as central black holes in various galaxies, we investigate gravitational lensing propert... |
gr-qc/0004018 | Marc Mars | Marc Mars | Uniqueness properties of the Kerr metric | 30 pages, LaTeX, submitted to Classical and Quantum Gravity | Class.Quant.Grav. 17 (2000) 3353 | 10.1088/0264-9381/17/16/317 | null | gr-qc | null | We obtain a geometrical condition on vacuum, stationary, asymptotically flat
spacetimes which is necessary and sufficient for the spacetime to be locally
isometric to Kerr. Namely, we prove a theorem stating that an asymptotically
flat, stationary, vacuum spacetime such that the so-called Killing form is an
eigenvect... | [
{
"created": "Thu, 6 Apr 2000 12:45:13 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Mars",
"Marc",
""
]
] | We obtain a geometrical condition on vacuum, stationary, asymptotically flat spacetimes which is necessary and sufficient for the spacetime to be locally isometric to Kerr. Namely, we prove a theorem stating that an asymptotically flat, stationary, vacuum spacetime such that the so-called Killing form is an eigenvector... |
1802.01371 | Janusz Garecki Prof | Marta Dudek, Janusz Garecki | General relativity with nonzero cosmological constant as a gauge theory | 13 pages, no figure,paper delivered on the conference Hypercomplex
Seminar 2017 in Bedlewo (Poland, EU) | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show in a new way that the general relativity action (and Lagrangian)in
recent Einstein-Palatini formulation is equivalent in four dimensions to the
action (and Lagrangian) of a gauge field. This paper is a continuation of the
previous paper [17] and it also gives an amended version of the lecture
delivered by one... | [
{
"created": "Mon, 5 Feb 2018 12:43:52 GMT",
"version": "v1"
}
] | 2018-02-06 | [
[
"Dudek",
"Marta",
""
],
[
"Garecki",
"Janusz",
""
]
] | We show in a new way that the general relativity action (and Lagrangian)in recent Einstein-Palatini formulation is equivalent in four dimensions to the action (and Lagrangian) of a gauge field. This paper is a continuation of the previous paper [17] and it also gives an amended version of the lecture delivered by one o... |
1102.1062 | Javad Taghizadeh Firouzjaee | J. T. Firouzjaee | The spherical symmetry Black hole collapse in expanding universe | 14 pages, 3 figures. Page layout and Some typos corrected | null | 10.1142/S0218271812500393 | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spherical symmetry Black holes are considered in expanding background.
The singularity line and the marginally trapped tube surface behavior are
discussed. In particular, we address the conditions of whether a dynamical
horizon forms for these cosmological black holes. We also discuss the
cosmological constant ef... | [
{
"created": "Sat, 5 Feb 2011 11:12:24 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Sep 2011 20:05:30 GMT",
"version": "v2"
},
{
"created": "Mon, 9 Apr 2012 08:27:34 GMT",
"version": "v3"
},
{
"created": "Thu, 9 Dec 2021 05:06:41 GMT",
"version": "v4"
}
] | 2021-12-10 | [
[
"Firouzjaee",
"J. T.",
""
]
] | The spherical symmetry Black holes are considered in expanding background. The singularity line and the marginally trapped tube surface behavior are discussed. In particular, we address the conditions of whether a dynamical horizon forms for these cosmological black holes. We also discuss the cosmological constant effe... |
1604.00468 | \.Ibrahim Semiz | \.Ibrahim Semiz | Random-walk baryogenesis via primordial black holes | Essay written for the Gravity Research Foundation 2016 Awards for
Essays on Gravitation. No figures | null | null | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitation violates baryon number $B$: A star has a huge amount of it, while
a black hole forming from the star has none. Consider primordial black holes
before the hadronic annihiliation in the early universe, encountering and
absorbing baryons and antibaryons: Each such absorption changes $B$ of the
universe by on... | [
{
"created": "Sat, 2 Apr 2016 07:22:48 GMT",
"version": "v1"
}
] | 2016-04-05 | [
[
"Semiz",
"İbrahim",
""
]
] | Gravitation violates baryon number $B$: A star has a huge amount of it, while a black hole forming from the star has none. Consider primordial black holes before the hadronic annihiliation in the early universe, encountering and absorbing baryons and antibaryons: Each such absorption changes $B$ of the universe by one ... |
gr-qc/0607098 | Rafal Moderski | R. Moderski and M. Rogatko | Thick Domain Walls in AdS Black Hole Spacetimes | 20 pages, 19 figures, accepted for publication in Phys. Rev. D | Phys.Rev. D74 (2006) 044002 | 10.1103/PhysRevD.74.044002 | null | gr-qc hep-th | null | Equations of motion for a real self-gravitating scalar field in the
background of a black hole with negative cosmological constant were solved
numerically. We obtain a sequence of static axisymmetric solutions representing
thick domain wall cosmological black hole systems, depending on the mass of
black hole, cosmolo... | [
{
"created": "Sun, 23 Jul 2006 14:32:03 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Moderski",
"R.",
""
],
[
"Rogatko",
"M.",
""
]
] | Equations of motion for a real self-gravitating scalar field in the background of a black hole with negative cosmological constant were solved numerically. We obtain a sequence of static axisymmetric solutions representing thick domain wall cosmological black hole systems, depending on the mass of black hole, cosmologi... |
1103.3961 | Matteo Smerlak | Valentin Bonzom and Matteo Smerlak | Bubble divergences: sorting out topology from cell structure | 19 pages | Annales Henri Poincar\'e: 13 (2012) 185-208 | 10.1007/s00023-011-0127-y | pi-qg-217 | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We conclude our analysis of bubble divergences in the flat spinfoam model. In
[arXiv:1008.1476] we showed that the divergence degree of an arbitrary
two-complex Gamma can be evaluated exactly by means of twisted cohomology.
Here, we specialize this result to the case where Gamma is the two-skeleton of
the cell decomp... | [
{
"created": "Mon, 21 Mar 2011 10:23:28 GMT",
"version": "v1"
}
] | 2012-02-03 | [
[
"Bonzom",
"Valentin",
""
],
[
"Smerlak",
"Matteo",
""
]
] | We conclude our analysis of bubble divergences in the flat spinfoam model. In [arXiv:1008.1476] we showed that the divergence degree of an arbitrary two-complex Gamma can be evaluated exactly by means of twisted cohomology. Here, we specialize this result to the case where Gamma is the two-skeleton of the cell decompos... |
gr-qc/0103073 | Daniele Amati | Daniele Amati | How strings solve the apparent contradiction between black holes and
quantum coherence | Talk delivered at the symposium on ``50 years of electroweak
physics'' NYU, 27-28 Oct. 2000, in honor of Alberto Sirlin 70'th anniversary | J.Phys.G29:31-34,2003 | 10.1088/0954-3899/29/1/304 | SISSA 23/01/EP | gr-qc | null | Computations in the calculable small coupling regime of string theories and
the general consensus that no new physics has to be invoked in continuing to
the large coupling (black hole) regime, suggest the following picture. Quantum
states are not black holes even if energy distributions would suggest so. Black
holes ... | [
{
"created": "Tue, 20 Mar 2001 15:25:19 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Amati",
"Daniele",
""
]
] | Computations in the calculable small coupling regime of string theories and the general consensus that no new physics has to be invoked in continuing to the large coupling (black hole) regime, suggest the following picture. Quantum states are not black holes even if energy distributions would suggest so. Black holes ap... |
1907.00974 | Zoltan Keresztes | Bal\'azs Mik\'oczi, Zolt\'an Keresztes | Spin dynamics of moving bodies in rotating black hole spacetimes | 24 pages; 14 figures | Ann. Phys. (Berlin) 2022, 2100444 | 10.1002/andp.202100444 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dynamics of spinning test bodies, moving in rotating black hole (Kerr,
Bardeen-like and Hayward-like) spacetimes, are investigated. In Kerr spacetime,
all the spherical, zoom-whirl and unbound orbits are considered numerically.
Along spherical orbits and for high spin, an amplitude modulation is found in
the harm... | [
{
"created": "Mon, 1 Jul 2019 17:58:21 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Feb 2022 15:45:53 GMT",
"version": "v2"
}
] | 2022-02-10 | [
[
"Mikóczi",
"Balázs",
""
],
[
"Keresztes",
"Zoltán",
""
]
] | The dynamics of spinning test bodies, moving in rotating black hole (Kerr, Bardeen-like and Hayward-like) spacetimes, are investigated. In Kerr spacetime, all the spherical, zoom-whirl and unbound orbits are considered numerically. Along spherical orbits and for high spin, an amplitude modulation is found in the harmon... |
2402.10916 | Abdelmalek Bouzenada . | Faizuddin Ahmed and Abdelmalek Bouzenada | PDM relativistic quantum oscillator in Einstein-Maxwell-Lambda
space-time | null | null | 10.1142/S0219887824502530 | null | gr-qc hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | In this analysis, we study the dynamics of quantum oscillator fields within
the context of a position-dependent mass (PDM) system situated in an
Einstein-Maxwell space-time, incorporating a non-zero cosmological constant.
The magnetic field is aligned along the symmetry axis direction. To analyze PDM
quantum oscillat... | [
{
"created": "Sat, 20 Jan 2024 16:02:04 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Jun 2024 16:15:50 GMT",
"version": "v2"
}
] | 2024-06-10 | [
[
"Ahmed",
"Faizuddin",
""
],
[
"Bouzenada",
"Abdelmalek",
""
]
] | In this analysis, we study the dynamics of quantum oscillator fields within the context of a position-dependent mass (PDM) system situated in an Einstein-Maxwell space-time, incorporating a non-zero cosmological constant. The magnetic field is aligned along the symmetry axis direction. To analyze PDM quantum oscillator... |
gr-qc/0603135 | Shun-Pei Miao | Shun-Pei Miao, R. P. Woodard (University of Florida) | Gravitons Enhance Fermions during Inflation | 31 pages, Latex 2epsilon, 1 figure, version 3 has updated references | Phys.Rev.D74:024021,2006 | 10.1103/PhysRevD.74.024021 | null | gr-qc hep-th | null | We solve the effective Dirac equation for massless fermions during inflation
in the simplest gauge, including all one loop corrections from quantum gravity.
At late times the result for a spatial plane wave behaves as if the classical
solution were subjected to a time dependent field strength renormalization of
Z_2(t... | [
{
"created": "Fri, 31 Mar 2006 18:25:49 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Jul 2006 20:09:14 GMT",
"version": "v2"
},
{
"created": "Sun, 11 May 2008 11:50:19 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Miao",
"Shun-Pei",
"",
"University of Florida"
],
[
"Woodard",
"R. P.",
"",
"University of Florida"
]
] | We solve the effective Dirac equation for massless fermions during inflation in the simplest gauge, including all one loop corrections from quantum gravity. At late times the result for a spatial plane wave behaves as if the classical solution were subjected to a time dependent field strength renormalization of Z_2(t) ... |
2407.10968 | Bruce Allen | Bruce Allen and Joseph D. Romano | Optimal reconstruction of the Hellings and Downs correlation | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Pulsar timing arrays (PTAs) detect gravitational waves (GWs) via the
correlations they create in the arrival times of pulses from different pulsars.
The mean correlation, a function of the angle between the directions to two
pulsars, was predicted in 1983 by Hellings and Downs (HD). Observation of this
angular patter... | [
{
"created": "Mon, 15 Jul 2024 17:59:24 GMT",
"version": "v1"
}
] | 2024-07-16 | [
[
"Allen",
"Bruce",
""
],
[
"Romano",
"Joseph D.",
""
]
] | Pulsar timing arrays (PTAs) detect gravitational waves (GWs) via the correlations they create in the arrival times of pulses from different pulsars. The mean correlation, a function of the angle between the directions to two pulsars, was predicted in 1983 by Hellings and Downs (HD). Observation of this angular pattern ... |
2007.04283 | Sharmila Gunasekaran | Sharmila Gunasekaran, Hari K. Kunduri | Slow decay of waves in gravitational solitons | 43 pages, 16 figures; v2 : typos corrected, various minor
improvements and clarifications | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a family of globally stationary (horizonless), asymptotically
flat solutions of five-dimensional supergravity. We prove that massless linear
scalar waves in such soliton spacetimes cannot have a uniform decay rate faster
than inverse logarithmically in time. This slow decay can be attributed to the
stable... | [
{
"created": "Wed, 8 Jul 2020 17:33:05 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Aug 2020 14:28:27 GMT",
"version": "v2"
}
] | 2020-08-11 | [
[
"Gunasekaran",
"Sharmila",
""
],
[
"Kunduri",
"Hari K.",
""
]
] | We consider a family of globally stationary (horizonless), asymptotically flat solutions of five-dimensional supergravity. We prove that massless linear scalar waves in such soliton spacetimes cannot have a uniform decay rate faster than inverse logarithmically in time. This slow decay can be attributed to the stable t... |
1909.07224 | Dr. Goutam Manna | Goutam Manna, Parthasarathi Majumdar and Bivash Majumder | K-essence Emergent Spacetime as Generalized Vaidya Geometry | 8 pages, 6 figures, Accepted from Physical Review D | Phys. Rev. D 101, 124034 (2020) | 10.1103/PhysRevD.101.124034 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We establish a formal connection between the {\bf K}-essence emergent gravity
scenario and generalizations of Vaidya spacetime. Choosing the {\bf K}-essence
action to be of the Dirac-Born-Infeld variety, the physical spacetime to be a
general static spherically symmetric black hole and restricting the {\bf
K}-essence... | [
{
"created": "Fri, 13 Sep 2019 17:06:37 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Apr 2020 02:03:08 GMT",
"version": "v2"
},
{
"created": "Fri, 29 May 2020 01:04:23 GMT",
"version": "v3"
}
] | 2020-07-01 | [
[
"Manna",
"Goutam",
""
],
[
"Majumdar",
"Parthasarathi",
""
],
[
"Majumder",
"Bivash",
""
]
] | We establish a formal connection between the {\bf K}-essence emergent gravity scenario and generalizations of Vaidya spacetime. Choosing the {\bf K}-essence action to be of the Dirac-Born-Infeld variety, the physical spacetime to be a general static spherically symmetric black hole and restricting the {\bf K}-essence s... |
2407.14909 | Francisco Fern\'andez-\'Alvarez | Francisco Fern\'andez-\'Alvarez | News tensor on null hypersurfaces | 25 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A geometric definition of news tensor on null hypersurfaces in four
space-time dimensions is presented. When the conformal Einstein field equations
hold, this news tensor yields the correct expression for the radiative
components of the rescaled Weyl tensor at infinity with vanishing cosmological
constant in arbitrar... | [
{
"created": "Sat, 20 Jul 2024 15:40:15 GMT",
"version": "v1"
}
] | 2024-07-23 | [
[
"Fernández-Álvarez",
"Francisco",
""
]
] | A geometric definition of news tensor on null hypersurfaces in four space-time dimensions is presented. When the conformal Einstein field equations hold, this news tensor yields the correct expression for the radiative components of the rescaled Weyl tensor at infinity with vanishing cosmological constant in arbitrary ... |
1511.07379 | Rafael A. Porto | Chad R. Galley, Adam K. Leibovich, Rafael A. Porto and Andreas Ross | The tail effect in gravitational radiation-reaction: time non-locality
and renormalization group evolution | 24 pages. 3 figures. v2: Extended discussion on the nature of IR/UV
singularities. Published version | Phys. Rev. D 93, 124010 (2016) | 10.1103/PhysRevD.93.124010 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the effective field theory (EFT) framework to calculate the tail
effect in gravitational radiation reaction, which enters at 4PN order in the
dynamics of a binary system. The computation entails a subtle interplay between
the near (or potential) and far (or radiation) zones. In particular, we find
that the tai... | [
{
"created": "Mon, 23 Nov 2015 19:40:28 GMT",
"version": "v1"
},
{
"created": "Sun, 15 May 2016 20:09:14 GMT",
"version": "v2"
}
] | 2016-06-15 | [
[
"Galley",
"Chad R.",
""
],
[
"Leibovich",
"Adam K.",
""
],
[
"Porto",
"Rafael A.",
""
],
[
"Ross",
"Andreas",
""
]
] | We use the effective field theory (EFT) framework to calculate the tail effect in gravitational radiation reaction, which enters at 4PN order in the dynamics of a binary system. The computation entails a subtle interplay between the near (or potential) and far (or radiation) zones. In particular, we find that the tail ... |
2103.15135 | Salvatore Capozziello | Salvatore Capozziello, Carlo Altucci, Francesco Bajardi, Andrea Basti,
Nicol\`o Beverini, Giorgio Carelli, Donatella Ciampini, Angela D. V. Di
Virgilio, Francesco Fuso, Umberto Giacomelli, Enrico Maccioni, Paolo Marsili,
Antonello Ortolan, Alberto Porzio, Andrea Simonelli, Giuseppe Terreni, and
Raffaele Velotta | Constraining Theories of Gravity by GINGER experiment | 15 pages, 3 figures, accepted for publication in EPJP | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The debate on gravity theories to extend or modify General Relativity is very
active today because of the issues related to ultra-violet and infra-red
behavior of Einstein's theory. In the first case, we have to address the
Quantum Gravity problem. In the latter, dark matter and dark energy, governing
the large scale... | [
{
"created": "Sun, 28 Mar 2021 13:44:35 GMT",
"version": "v1"
}
] | 2021-03-30 | [
[
"Capozziello",
"Salvatore",
""
],
[
"Altucci",
"Carlo",
""
],
[
"Bajardi",
"Francesco",
""
],
[
"Basti",
"Andrea",
""
],
[
"Beverini",
"Nicolò",
""
],
[
"Carelli",
"Giorgio",
""
],
[
"Ciampini",
"Donatella",
... | The debate on gravity theories to extend or modify General Relativity is very active today because of the issues related to ultra-violet and infra-red behavior of Einstein's theory. In the first case, we have to address the Quantum Gravity problem. In the latter, dark matter and dark energy, governing the large scale s... |
2404.14641 | Horng Sheng Chia | Horng Sheng Chia, Zihan Zhou, Mikhail M. Ivanov | Bring the Heat: Tidal Heating Constraints for Black Holes and Exotic
Compact Objects from the LIGO-Virgo-KAGRA Data | 30+18 pages, 7 figures | null | null | MIT-CTP/5710 | gr-qc astro-ph.CO astro-ph.HE hep-ph hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | We present the first constraints on tidal heating for the binary systems
detected in the LIGO-Virgo-KAGRA (LVK) gravitational wave data. Tidal heating,
also known as tidal dissipation, characterizes the viscous nature of an
astrophysical body and provides a channel for exchanging energy and angular
momentum with the ... | [
{
"created": "Tue, 23 Apr 2024 00:34:38 GMT",
"version": "v1"
}
] | 2024-04-24 | [
[
"Chia",
"Horng Sheng",
""
],
[
"Zhou",
"Zihan",
""
],
[
"Ivanov",
"Mikhail M.",
""
]
] | We present the first constraints on tidal heating for the binary systems detected in the LIGO-Virgo-KAGRA (LVK) gravitational wave data. Tidal heating, also known as tidal dissipation, characterizes the viscous nature of an astrophysical body and provides a channel for exchanging energy and angular momentum with the ti... |
2106.08070 | Cosimo Bambi | Kimet Jusufi, Saurabh Kumar, Mustapha Azreg-A\"inou, Mubasher Jamil,
Qiang Wu, Cosimo Bambi | Constraining Wormhole Geometries using the Orbit of S2 Star and the
Event Horizon Telescope | 14 pages, 7 figures. v2: refereed version | Eur. Phys. J. C (2022) 82:633 | 10.1140/epjc/s10052-022-10603-7 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the possibility of having a wormhole (WH) as a
candidate for the Sgr A$^\star$ central object and test this idea by
constraining their geometry using the motion of S2 star and the reconstructed
shadow images. In particular, we consider three WH models, including WHs in
Einstein theory, brane-wo... | [
{
"created": "Tue, 15 Jun 2021 11:54:41 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Jul 2022 06:24:28 GMT",
"version": "v2"
}
] | 2022-07-26 | [
[
"Jusufi",
"Kimet",
""
],
[
"Kumar",
"Saurabh",
""
],
[
"Azreg-Aïnou",
"Mustapha",
""
],
[
"Jamil",
"Mubasher",
""
],
[
"Wu",
"Qiang",
""
],
[
"Bambi",
"Cosimo",
""
]
] | In this paper we study the possibility of having a wormhole (WH) as a candidate for the Sgr A$^\star$ central object and test this idea by constraining their geometry using the motion of S2 star and the reconstructed shadow images. In particular, we consider three WH models, including WHs in Einstein theory, brane-worl... |
gr-qc/0501025 | Noriko Shiiki | Noriko Shiiki and Nobuyuki Sawado | Black Holes with Skyrme Hair | 40 pages, 14 figures; Invited paper for "Black Holes: Research and
Development", Nova Science Publishers, Inc. NY | null | null | null | gr-qc | null | This paper is intended to give a review of the recent developments on black
holes with Skyrme hair. The Einstein-Skyrme system is known to possess black
hole solutions with Skyrme hair. The spherically symmetric black hole skyrmion
with B=1 was the first discovered counter example of the no-hair conjecture for
black ... | [
{
"created": "Sun, 9 Jan 2005 06:47:19 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Shiiki",
"Noriko",
""
],
[
"Sawado",
"Nobuyuki",
""
]
] | This paper is intended to give a review of the recent developments on black holes with Skyrme hair. The Einstein-Skyrme system is known to possess black hole solutions with Skyrme hair. The spherically symmetric black hole skyrmion with B=1 was the first discovered counter example of the no-hair conjecture for black ho... |
2207.06034 | Subhadip Sau | Indrani Banerjee, Subhadip Sau and Soumitra SenGupta | Do shadows of Sgr A* and M87* indicate black holes with a magnetic
monopole charge? | 24 pages, 8 figures | null | null | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | We study the prospect of Bardeen black holes in explaining the observed
shadow of Sgr A* and M87*. Bardeen black holes are regular black holes endowed
with a magnetic monopole charge that arise in Einstein gravity coupled to
non-linear electrodynamics. These black holes are interesting as they can evade
the r = 0 cur... | [
{
"created": "Wed, 13 Jul 2022 08:30:41 GMT",
"version": "v1"
}
] | 2022-07-14 | [
[
"Banerjee",
"Indrani",
""
],
[
"Sau",
"Subhadip",
""
],
[
"SenGupta",
"Soumitra",
""
]
] | We study the prospect of Bardeen black holes in explaining the observed shadow of Sgr A* and M87*. Bardeen black holes are regular black holes endowed with a magnetic monopole charge that arise in Einstein gravity coupled to non-linear electrodynamics. These black holes are interesting as they can evade the r = 0 curva... |
1403.6316 | Matej Pavsic | Matej Pav\v{s}i\v{c} | On the quantisation of gravity by embedding spacetime in a higher
dimensional space | 25 pages, 3 figures | Classical and Quantum Gravity 2 (1985) 869--889 | 10.1088/0264-9381/2/6/012 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Certain difficulties of quantum gravity can be avoided if we embed the
spacetime $V_4$ into a higher dimensional space $V_N$; then our spacetime is
merely a 4-surface in $V_N$.What remains is conceptually not so difficult: just
to quantise this 4-surface. Our formal procedure generalises our version of
Stueckelberg's... | [
{
"created": "Tue, 25 Mar 2014 11:51:40 GMT",
"version": "v1"
}
] | 2014-03-26 | [
[
"Pavšič",
"Matej",
""
]
] | Certain difficulties of quantum gravity can be avoided if we embed the spacetime $V_4$ into a higher dimensional space $V_N$; then our spacetime is merely a 4-surface in $V_N$.What remains is conceptually not so difficult: just to quantise this 4-surface. Our formal procedure generalises our version of Stueckelberg's p... |
2404.02479 | Georgios Antoniou | Georgios Antoniou, Caio F. B. Macedo, Andrea Maselli, Thomas P.
Sotiriou | Axial perturbations of hairy black holes in generalised scalar-tensor
theories | 12 pages, 7 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational wave observations can test the validity of General Relativity
(GR) in the strong field regime. Certain classes of scalar-tensor theories
indeed predict that compact objects can exhibit significant deviations from
their GR counterparts. Here we explore the quasinormal modes of axial
perturbations in sphe... | [
{
"created": "Wed, 3 Apr 2024 05:37:52 GMT",
"version": "v1"
}
] | 2024-04-04 | [
[
"Antoniou",
"Georgios",
""
],
[
"Macedo",
"Caio F. B.",
""
],
[
"Maselli",
"Andrea",
""
],
[
"Sotiriou",
"Thomas P.",
""
]
] | Gravitational wave observations can test the validity of General Relativity (GR) in the strong field regime. Certain classes of scalar-tensor theories indeed predict that compact objects can exhibit significant deviations from their GR counterparts. Here we explore the quasinormal modes of axial perturbations in spheri... |
gr-qc/0511015 | G. Dautcourt | G.Dautcourt, M. Abdel-Megied | Revisiting the Light Cone of the Goedel Universe | 23 pages, 3 figures, iopart | Class.Quant.Grav. 23 (2006) 1269-1288 | 10.1088/0264-9381/23/4/013 | null | gr-qc | null | The structure of a light cone in the Goedel universe is studied. We derive
the intrinsic cone metric, calculate the rotation coefficients of the ray
congruence forming the cone, determine local differential invariants up to
second order, describe the crossover (keel) singularities and give a first
discussion of its f... | [
{
"created": "Thu, 3 Nov 2005 12:39:52 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Dautcourt",
"G.",
""
],
[
"Abdel-Megied",
"M.",
""
]
] | The structure of a light cone in the Goedel universe is studied. We derive the intrinsic cone metric, calculate the rotation coefficients of the ray congruence forming the cone, determine local differential invariants up to second order, describe the crossover (keel) singularities and give a first discussion of its foc... |
0802.2381 | Vasily Borodikhin | V.N. Borodikhin | Vector Theory of Gravity | 9 pages | Grav.Cosmol.17:161-165,2011 | 10.1134/S0202289311020071 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We proposed a gravitation theory based on an analogy with electrodynamics on
the basis of a vector field. For the first time, to calculate the basic
gravitational effects in the framework of a vector theory of gravity, we use a
Lagrangian written with gravitational radiation neglected and generalized to
the case of u... | [
{
"created": "Sun, 17 Feb 2008 13:19:42 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Apr 2011 06:44:30 GMT",
"version": "v2"
}
] | 2011-04-20 | [
[
"Borodikhin",
"V. N.",
""
]
] | We proposed a gravitation theory based on an analogy with electrodynamics on the basis of a vector field. For the first time, to calculate the basic gravitational effects in the framework of a vector theory of gravity, we use a Lagrangian written with gravitational radiation neglected and generalized to the case of ult... |
0908.2638 | Leon Heller | Leon Heller | On the Penrose process for rotating black holes | 10 pages, 3 figures | null | null | LA-UR 09-05070 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Penrose described a process that, in principle, could extract energy and
angular momentum from a rotating black hole. Here we examine two procedures
that were claimed to be capable of implementing the Penrose idea; both make use
of a particle moving at the horizon. In one, the particle is swallowed, and in
the other ... | [
{
"created": "Tue, 18 Aug 2009 20:46:51 GMT",
"version": "v1"
}
] | 2009-08-20 | [
[
"Heller",
"Leon",
""
]
] | Penrose described a process that, in principle, could extract energy and angular momentum from a rotating black hole. Here we examine two procedures that were claimed to be capable of implementing the Penrose idea; both make use of a particle moving at the horizon. In one, the particle is swallowed, and in the other th... |
gr-qc/0502086 | Parampreet Singh | Parampreet Singh | Effective State Metamorphosis in Semi-Classical Loop Quantum Cosmology | Revised version; includes expanded discussion of natural
trans-Planckian modifications to frequency dispersion and robustness to
quantization ambiguities. To appear in Class. Quant. Grav | Class.Quant.Grav. 22 (2005) 4203-4216 | 10.1088/0264-9381/22/20/003 | IGPG-05/2-2 | gr-qc astro-ph hep-th | null | Modification to the behavior of geometrical density at short scales is a key
result of loop quantum cosmology, responsible for an interesting phenomenology
in the very early universe. We demonstrate the way matter with arbitrary scale
factor dependence in Hamiltonian incorporates this change in its effective
dynamics... | [
{
"created": "Mon, 21 Feb 2005 17:59:36 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Aug 2005 14:08:26 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Singh",
"Parampreet",
""
]
] | Modification to the behavior of geometrical density at short scales is a key result of loop quantum cosmology, responsible for an interesting phenomenology in the very early universe. We demonstrate the way matter with arbitrary scale factor dependence in Hamiltonian incorporates this change in its effective dynamics i... |
1112.6211 | Alfredo Lopez Ortega | A. Lopez-Ortega | Entropy spectra of single horizon black holes in two dimensions | 13 pages | null | 10.1142/S0218271811020524 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Hod conjecture proposes that the asymptotic quasinormal frequencies
determine the entropy quantum of a black hole. Considering the Maggiore
modification of this conjecture we calculate the entropy spectra of general,
single horizon, asymptotically flat black holes in two-dimensional dilaton
gravity. We also compu... | [
{
"created": "Thu, 29 Dec 2011 01:12:00 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Lopez-Ortega",
"A.",
""
]
] | The Hod conjecture proposes that the asymptotic quasinormal frequencies determine the entropy quantum of a black hole. Considering the Maggiore modification of this conjecture we calculate the entropy spectra of general, single horizon, asymptotically flat black holes in two-dimensional dilaton gravity. We also compute... |
0904.2559 | Rituparno Goswami | Naureen Goheer, Rituparno Goswami, Peter K. S. Dunsby, Kishore Ananda | On the co-existence of matter dominated and accelerating solutions in
f(G)-gravity | 5 pages, revtex4, letter | Phys.Rev.D79:121301,2009 | 10.1103/PhysRevD.79.121301 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Working within the theory of modified Gauss-Bonnet gravity, we show that
FLRW--like power--law solutions only exist for a very special class of
f(G)theories. Furthermore, we point out that any transition from decelerated to
accelerated expansion must pass through G=0, and no function f(G) that is
differentiable at th... | [
{
"created": "Thu, 16 Apr 2009 18:50:29 GMT",
"version": "v1"
}
] | 2009-06-30 | [
[
"Goheer",
"Naureen",
""
],
[
"Goswami",
"Rituparno",
""
],
[
"Dunsby",
"Peter K. S.",
""
],
[
"Ananda",
"Kishore",
""
]
] | Working within the theory of modified Gauss-Bonnet gravity, we show that FLRW--like power--law solutions only exist for a very special class of f(G)theories. Furthermore, we point out that any transition from decelerated to accelerated expansion must pass through G=0, and no function f(G) that is differentiable at this... |
1809.10586 | Stefano Lucat | A.Barnaveli, S.Lucat, T.Prokopec | Inflation as a spontaneous symmetry breaking of Weyl symmetry | 27 pages, 9 figures | null | 10.1088/1475-7516/2019/01/022 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study a novel realization of inflation, based on Weyl
invariant gravity with torsion. We show that requiring the classical action for
the scalar field to be Weyl invariant introduces a dilaton which induces a non
trivial modification of the field space geometry of the scalar sector, which
allows for ... | [
{
"created": "Thu, 27 Sep 2018 15:47:03 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Oct 2018 09:17:56 GMT",
"version": "v2"
}
] | 2019-01-16 | [
[
"Barnaveli",
"A.",
""
],
[
"Lucat",
"S.",
""
],
[
"Prokopec",
"T.",
""
]
] | In this paper we study a novel realization of inflation, based on Weyl invariant gravity with torsion. We show that requiring the classical action for the scalar field to be Weyl invariant introduces a dilaton which induces a non trivial modification of the field space geometry of the scalar sector, which allows for in... |
gr-qc/0204029 | Lixiang | Li Xiang | Black hole entropy without brick walls | 7 pages | Phys.Lett. B540 (2002) 9-13 | 10.1016/S0370-2693(02)02123-8 | null | gr-qc hep-th | null | The properties of the thermal radiation are discussed by using the new
equation of state density motivated by the generalized uncertainty relation in
the quantum gravity. There is no burst at the last stage of the emission of a
Schwarzshild black hole. When the new equation of state density is utilized to
investigate... | [
{
"created": "Sat, 6 Apr 2002 06:56:36 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Aug 2002 00:47:37 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Xiang",
"Li",
""
]
] | The properties of the thermal radiation are discussed by using the new equation of state density motivated by the generalized uncertainty relation in the quantum gravity. There is no burst at the last stage of the emission of a Schwarzshild black hole. When the new equation of state density is utilized to investigate t... |
1406.2089 | Titus K Mathew | Titus K Mathew, Aswathy M B and Manoj M | Cosmology and thermodynamics of FRW universe with bulk viscous stiff
fluid | null | null | 10.1140/epjc/s10052-014-3188-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a cosmological model dominated by stiff fluid with a constant
bulk viscosity. We classify all the possible cases of the universe predicted by
the model and analyzing the scale factor, density as well as the curvature
scalar. We find that when the dimensionless constant bulk viscous parameter is
in the ran... | [
{
"created": "Mon, 9 Jun 2014 06:54:02 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Mathew",
"Titus K",
""
],
[
"B",
"Aswathy M",
""
],
[
"M",
"Manoj",
""
]
] | We consider a cosmological model dominated by stiff fluid with a constant bulk viscosity. We classify all the possible cases of the universe predicted by the model and analyzing the scale factor, density as well as the curvature scalar. We find that when the dimensionless constant bulk viscous parameter is in the range... |
2007.04065 | Diego Rubiera-Garcia | Gonzalo J. Olmo, Diego Rubiera-Garcia | Junction conditions in Palatini $f(R)$ gravity | 7 pages; some additions in conclusions and references' list. Version
accepted for publication on Class. Quant. Grav | null | 10.1088/1361-6382/abb924 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We work out the junction conditions for $f(R)$ gravity formulated in
metric-affine (Palatini) spaces using a tensor distributional approach. These
conditions are needed for building consistent models of gravitating bodies with
an interior and exterior regions matched at some hypersurface. Some of these
conditions dep... | [
{
"created": "Wed, 8 Jul 2020 12:31:49 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Sep 2020 08:49:50 GMT",
"version": "v2"
}
] | 2020-10-28 | [
[
"Olmo",
"Gonzalo J.",
""
],
[
"Rubiera-Garcia",
"Diego",
""
]
] | We work out the junction conditions for $f(R)$ gravity formulated in metric-affine (Palatini) spaces using a tensor distributional approach. These conditions are needed for building consistent models of gravitating bodies with an interior and exterior regions matched at some hypersurface. Some of these conditions depar... |
0812.1889 | Roy Maartens | Roy Maartens, Kevin Vandersloot | Magnetic Bianchi I Universe in Loop Quantum Cosmology | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the dynamical consequences of homogeneous cosmological magnetic
fields in the framework of loop quantum cosmology. We show that a big-bounce
occurs in a collapsing magnetized Bianchi I universe, thus extending the known
cases of singularity-avoidance. Previous work has shown that perfect fluid
Bianchi I un... | [
{
"created": "Wed, 10 Dec 2008 11:00:04 GMT",
"version": "v1"
}
] | 2008-12-11 | [
[
"Maartens",
"Roy",
""
],
[
"Vandersloot",
"Kevin",
""
]
] | We examine the dynamical consequences of homogeneous cosmological magnetic fields in the framework of loop quantum cosmology. We show that a big-bounce occurs in a collapsing magnetized Bianchi I universe, thus extending the known cases of singularity-avoidance. Previous work has shown that perfect fluid Bianchi I univ... |
gr-qc/0602111 | Waldyr A. Rodrigues Jr. | Waldyr A. Rodrigues Jr | A Comment on Emergent Gravity | 21 pages. In this version some misprints have been corrected, two new
references have been added and some (eventual) offensive observations have
been deleted | null | null | null | gr-qc | null | This paper is a set of notes that we wrote concerning the first version of
Emergent Gravity [gr-qc/0602022]. It is our version of an exercise that we
proposed to some of our students. The idea was to find mathematical errors and
inconsistencies on some recent articles published in scientific journals and in
the arXiv... | [
{
"created": "Mon, 27 Feb 2006 12:17:17 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Mar 2006 10:57:06 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Rodrigues",
"Waldyr A.",
"Jr"
]
] | This paper is a set of notes that we wrote concerning the first version of Emergent Gravity [gr-qc/0602022]. It is our version of an exercise that we proposed to some of our students. The idea was to find mathematical errors and inconsistencies on some recent articles published in scientific journals and in the arXiv, ... |
2308.08639 | Yu-Meng Xu | Yumeng Xu, Shubhanshu Tiwari, Marco Drago | PycWB: A User-friendly, Modular, and Python-based Framework for
Gravitational Wave Unmodelled Search | 16 pages, 4 figures | SoftwareX Volume 26, May 2024, 101639 | 10.1016/j.softx.2024.101639 | null | gr-qc astro-ph.IM | http://creativecommons.org/licenses/by/4.0/ | Unmodelled searches and reconstruction is a critical aspect of gravitational
wave data analysis, requiring sophisticated software tools for robust data
analysis. This paper introduces PycWB, a user-friendly and modular Python-based
framework developed to enhance such analyses based on the widely used
unmodelled searc... | [
{
"created": "Wed, 16 Aug 2023 19:20:26 GMT",
"version": "v1"
}
] | 2024-03-05 | [
[
"Xu",
"Yumeng",
""
],
[
"Tiwari",
"Shubhanshu",
""
],
[
"Drago",
"Marco",
""
]
] | Unmodelled searches and reconstruction is a critical aspect of gravitational wave data analysis, requiring sophisticated software tools for robust data analysis. This paper introduces PycWB, a user-friendly and modular Python-based framework developed to enhance such analyses based on the widely used unmodelled search ... |
2402.17814 | Marcos Vinicius De Sousa Silva | Manuel E. Rodrigues, Marcos V. de S. Silva | Comment on "Source of black bounces in Rastall gravity'' | Comment on arXiv:2311.07637. V2: Some typos corrected. Version
published in JCAP | JCAP05(2024)012 | 10.1088/1475-7516/2024/05/012 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In Atazadeh and Hadi (JCAP \textbf{01}, 067 (2024)), the authors proposed
that black bounce solutions, such as the Simpson-Visser and the Bardeen-type
spacetimes, can be obtained from Rastall gravity. To achieve these spacetimes,
the authors consider the presence of a phantom scalar field with nonlinear
electrodynami... | [
{
"created": "Tue, 27 Feb 2024 15:00:13 GMT",
"version": "v1"
},
{
"created": "Thu, 2 May 2024 16:12:06 GMT",
"version": "v2"
}
] | 2024-05-03 | [
[
"Rodrigues",
"Manuel E.",
""
],
[
"Silva",
"Marcos V. de S.",
""
]
] | In Atazadeh and Hadi (JCAP \textbf{01}, 067 (2024)), the authors proposed that black bounce solutions, such as the Simpson-Visser and the Bardeen-type spacetimes, can be obtained from Rastall gravity. To achieve these spacetimes, the authors consider the presence of a phantom scalar field with nonlinear electrodynamics... |
2308.00049 | Ben Kain | Ben Kain | Einstein-Dirac-Maxwell wormholes in quantum field theory | 12 pages, 5 figures; v2: typos corrected | Phys. Rev. D 108, 084010 (2023) | 10.1103/PhysRevD.108.084010 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Charged Dirac fields minimally coupled to gravity have spherically symmetric
wormhole solutions known as Einstein-Dirac-Maxwell (EDM) wormholes. EDM
wormholes do not make use of exotic matter and exist in asymptotically flat
general relativity. We construct static spherically symmetric EDM wormhole
configurations in ... | [
{
"created": "Mon, 31 Jul 2023 18:10:05 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Oct 2023 15:45:29 GMT",
"version": "v2"
}
] | 2023-10-11 | [
[
"Kain",
"Ben",
""
]
] | Charged Dirac fields minimally coupled to gravity have spherically symmetric wormhole solutions known as Einstein-Dirac-Maxwell (EDM) wormholes. EDM wormholes do not make use of exotic matter and exist in asymptotically flat general relativity. We construct static spherically symmetric EDM wormhole configurations in qu... |
2012.12778 | Yang Huang | Yang Huang and Hongsheng Zhang | Quasibound states of charged dilatonic black holes | 9 pages, 17 figures | Phys. Rev. D 103, 044062 (2021) | 10.1103/PhysRevD.103.044062 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Investigation of quasibound states of black holes is significant for expected
ultra light particles, as well as black holes through gravitational waves. We
first investigate quasibound states of a massive scalar field for dilatonic
charged black holes via numerical analysis. We study the complex eigen
frequencies of ... | [
{
"created": "Wed, 23 Dec 2020 16:34:32 GMT",
"version": "v1"
}
] | 2021-03-03 | [
[
"Huang",
"Yang",
""
],
[
"Zhang",
"Hongsheng",
""
]
] | Investigation of quasibound states of black holes is significant for expected ultra light particles, as well as black holes through gravitational waves. We first investigate quasibound states of a massive scalar field for dilatonic charged black holes via numerical analysis. We study the complex eigen frequencies of th... |
1309.2933 | David Delphenich | D. H. Delphenich | Line geometry and electromagnetism I: basic structures | 26 pages, one figure, one table, part I of two-part article | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Some key notions of line geometry are recalled, along with their application
to mechanics. It is then shown that most of the basic structures that one
introduces in the pre-metric formulation of electromagnetism can be interpreted
directly in terms of corresponding concepts in line geometry. The results are
summarize... | [
{
"created": "Wed, 11 Sep 2013 18:00:52 GMT",
"version": "v1"
}
] | 2013-09-13 | [
[
"Delphenich",
"D. H.",
""
]
] | Some key notions of line geometry are recalled, along with their application to mechanics. It is then shown that most of the basic structures that one introduces in the pre-metric formulation of electromagnetism can be interpreted directly in terms of corresponding concepts in line geometry. The results are summarized ... |
2302.11460 | Adailton Ara\'ujo Filho | P. Sedaghatnia, H. Hassanabadi, A. A. Ara\'ujo Filho, J. Porf\'irio,
W. S. Chung | Thermodynamical properties of a deformed Schwarzschild black hole via
Dunkl generalization | 12 pages and 5 figures | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we construct a deformed Schwarzschild black hole from the de
Sitter gauge theory of gravity within Dunkl generalization and we determine the
metric coefficients versus Dunkl parameter and parity operators. Since the
spacetime coordinates are not affected by the group transformations, only
fields are al... | [
{
"created": "Wed, 22 Feb 2023 15:53:28 GMT",
"version": "v1"
}
] | 2023-02-23 | [
[
"Sedaghatnia",
"P.",
""
],
[
"Hassanabadi",
"H.",
""
],
[
"Filho",
"A. A. Araújo",
""
],
[
"Porfírio",
"J.",
""
],
[
"Chung",
"W. S.",
""
]
] | In this paper, we construct a deformed Schwarzschild black hole from the de Sitter gauge theory of gravity within Dunkl generalization and we determine the metric coefficients versus Dunkl parameter and parity operators. Since the spacetime coordinates are not affected by the group transformations, only fields are allo... |
gr-qc/0208050 | Yuan-Zhong Zhang | K.K. Nandi and Yuan-Zhong Zhang | General Relativistic Effects on Quantum Interference and the Principle
of Equivalence | 14 pages, 1 figure | Phys.Rev. D66 (2002) 063005 | 10.1103/PhysRevD.66.063005 | null | gr-qc | null | Using a novel approach, we work out the general relativistic effects on the
quantum interference of de Broglie waves associated with thermal neutrons. The
unified general formula is consistent with special relativistic results in the
flat space limit. It is also shown that the exact geodesic equation contains in
a na... | [
{
"created": "Sat, 17 Aug 2002 10:33:59 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Nandi",
"K. K.",
""
],
[
"Zhang",
"Yuan-Zhong",
""
]
] | Using a novel approach, we work out the general relativistic effects on the quantum interference of de Broglie waves associated with thermal neutrons. The unified general formula is consistent with special relativistic results in the flat space limit. It is also shown that the exact geodesic equation contains in a natu... |
1211.2166 | Hal Haggard | Hal M. Haggard, Carlo Rovelli, Francesca Vidotto, Wolfgang Wieland | The spin connection of twisted geometry | 5 pages, 2 figures | Phys. Rev. D 87, 024038 (2013) | 10.1103/PhysRevD.87.024038 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Twisted geometry is a piecewise-flat geometry less rigid than Regge geometry.
In Loop Gravity, it provides the classical limit for each step of the
truncation utilized in the definition of the quantum theory. We define the
torsionless spin-connection of a twisted geometry. The difficulty given by the
discontinuity of... | [
{
"created": "Fri, 9 Nov 2012 15:59:26 GMT",
"version": "v1"
}
] | 2014-03-12 | [
[
"Haggard",
"Hal M.",
""
],
[
"Rovelli",
"Carlo",
""
],
[
"Vidotto",
"Francesca",
""
],
[
"Wieland",
"Wolfgang",
""
]
] | Twisted geometry is a piecewise-flat geometry less rigid than Regge geometry. In Loop Gravity, it provides the classical limit for each step of the truncation utilized in the definition of the quantum theory. We define the torsionless spin-connection of a twisted geometry. The difficulty given by the discontinuity of t... |
0911.4950 | Martin Bojowald | Martin Bojowald and Artur Tsobanjan | Effective Constraints and Physical Coherent States in Quantum Cosmology:
A Numerical Comparison | 32 pages, 25 figures | Class. Quant Grav.27:145004, 2010 | 10.1088/0264-9381/27/14/145004 | IGC-09/11-4 | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A cosmological model with a cyclic interpretation is introduced, which is
subject to quantum back-reaction and yet can be treated rather completely by
physical coherent state as well as effective constraint techniques. By this
comparison, the role of quantum back-reaction in quantum cosmology is
unambiguously demonst... | [
{
"created": "Wed, 25 Nov 2009 20:37:21 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Bojowald",
"Martin",
""
],
[
"Tsobanjan",
"Artur",
""
]
] | A cosmological model with a cyclic interpretation is introduced, which is subject to quantum back-reaction and yet can be treated rather completely by physical coherent state as well as effective constraint techniques. By this comparison, the role of quantum back-reaction in quantum cosmology is unambiguously demonstra... |
0911.1479 | Rafael Sorkin | Rafael D. Sorkin (Perimeter Institute and Syracuse University) | Is the spacetime metric Euclidean rather than Lorentzian? | plainTeX, 21 pages, 1 figure (in color). A few minor corrections and
some re-wording. A previous version erroneously gave Re(f(z)) rather than
Im(f(z)) (Thanks to Adam Brown for this correction.) Most current version is
available at
http://www.perimeterinstitute.ca/personal/rsorkin/some.papers/134.tunneling.pdf... | {\it Recent Research in Quantum Gravity}, edited by Arundhati
Dasgupta (Nova Science Publishers NY, 2013, ISBN: 978-1-61942-392-3) pp.
115-135 | null | null | gr-qc hep-th math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | My answer to the question in the title is "No". In support of this point of
view, we analyze some examples of saddle-point methods, especially as applied
to quantum "tunneling" in nonrelativistic particle mechanics and in cosmology.
Along the way we explore some of the interrelationships among different ways of
think... | [
{
"created": "Sun, 8 Nov 2009 00:44:15 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Nov 2009 06:19:24 GMT",
"version": "v2"
},
{
"created": "Mon, 5 Jun 2017 00:13:46 GMT",
"version": "v3"
}
] | 2017-06-06 | [
[
"Sorkin",
"Rafael D.",
"",
"Perimeter Institute and Syracuse University"
]
] | My answer to the question in the title is "No". In support of this point of view, we analyze some examples of saddle-point methods, especially as applied to quantum "tunneling" in nonrelativistic particle mechanics and in cosmology. Along the way we explore some of the interrelationships among different ways of thinkin... |
gr-qc/0508053 | Yungui Gong | Yungui Gong and Yuan-Zhong Zhang | Dark energy and the future fate of the Universe | 2 figures, 11 pages, Mod. Phys. Lett. A in press | Mod.Phys.Lett.A22:2689-2699,2007 | 10.1142/S021773230702292X | null | gr-qc astro-ph hep-th | null | We consider the possibility of observing the onset of the late time inflation
of our patch of the Universe. The Hubble size criterion and the event horizon
criterion are applied to several dark energy models to discuss the problem of
future inflation of the Universe. We find that the acceleration has not lasted
long ... | [
{
"created": "Fri, 12 Aug 2005 14:53:09 GMT",
"version": "v1"
},
{
"created": "Sat, 13 Aug 2005 07:09:18 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Oct 2007 10:01:37 GMT",
"version": "v3"
}
] | 2010-10-27 | [
[
"Gong",
"Yungui",
""
],
[
"Zhang",
"Yuan-Zhong",
""
]
] | We consider the possibility of observing the onset of the late time inflation of our patch of the Universe. The Hubble size criterion and the event horizon criterion are applied to several dark energy models to discuss the problem of future inflation of the Universe. We find that the acceleration has not lasted long en... |
gr-qc/9606030 | Haret Rosu | H.C. Rosu, J. Socorro | Supersymmetric strictly isospectral FRW models for zero factor ordering | 6 twocolumn pages including 6 eps figs | Nuovo Cimento B 113 (May 1998) 683-689 | null | null | gr-qc | null | We apply the strictly isospectral technique of standard supersymmetric
quantum mechanics to the Q=0 factor ordered Wheeler-DeWitt equation for the
Friedmann-Robertson-Walker (FRW) minisuperspace model. The resulting strictly
isospectral one-parameter families of both FRW cosmological potentials and
"wavefunctions of ... | [
{
"created": "Fri, 14 Jun 1996 00:42:00 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Jul 1996 04:21:00 GMT",
"version": "v2"
},
{
"created": "Tue, 27 May 1997 23:10:24 GMT",
"version": "v3"
},
{
"created": "Sun, 11 Jul 1999 01:23:05 GMT",
"version": "v4"
}
] | 2009-09-25 | [
[
"Rosu",
"H. C.",
""
],
[
"Socorro",
"J.",
""
]
] | We apply the strictly isospectral technique of standard supersymmetric quantum mechanics to the Q=0 factor ordered Wheeler-DeWitt equation for the Friedmann-Robertson-Walker (FRW) minisuperspace model. The resulting strictly isospectral one-parameter families of both FRW cosmological potentials and "wavefunctions of th... |
1610.07750 | Marcello Ortaggio | Marcello Ortaggio | On the uniqueness of the Myers-Perry spacetime as a type II(D) solution
in six dimensions | 30 pages. v2: a few typos fixed, added references, minor improvements
(results unchanged) | JHEP 1706 (2017) 042 | 10.1007/JHEP06(2017)042 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the class of vacuum (Ricci flat) six-dimensional spacetimes
admitting a non-degenerate multiple Weyl aligned null direction l, thus being
of Weyl type II or more special. Subject to an additional assumption on the
asymptotic fall-off of the Weyl tensor, we prove that these spacetimes can be
completely classi... | [
{
"created": "Tue, 25 Oct 2016 07:05:02 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jun 2017 11:50:43 GMT",
"version": "v2"
}
] | 2017-06-26 | [
[
"Ortaggio",
"Marcello",
""
]
] | We study the class of vacuum (Ricci flat) six-dimensional spacetimes admitting a non-degenerate multiple Weyl aligned null direction l, thus being of Weyl type II or more special. Subject to an additional assumption on the asymptotic fall-off of the Weyl tensor, we prove that these spacetimes can be completely classifi... |
gr-qc/0402020 | William Joseph Weber | D. Bortoluzzi, L. Carbone, A. Cavalleri, M. Da Lio, R. Dolesi, C. D.
Hoyle, M.Hueller, S. Vitale, and W. J. Weber | Measuring random force noise for LISA aboard the LISA Pathfinder mission | 7 pages, 3 figures. To be published in Classical and Quantum Gravity
with the proceedings of the 2003 Amaldi Meeting | Class.Quant.Grav. 21 (2004) S573-S580 | 10.1088/0264-9381/21/5/028 | null | gr-qc | null | The LTP (LISA Testflight Package), to be flown aboard the ESA / NASA LISA
Pathfinder mission, aims to demonstrate drag-free control for LISA test masses
with acceleration noise below 30 fm/s^2/Hz^1/2 from 1-30 mHz. This paper
describes the LTP measurement of random, position independent forces acting on
the test mass... | [
{
"created": "Wed, 4 Feb 2004 16:41:11 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Bortoluzzi",
"D.",
""
],
[
"Carbone",
"L.",
""
],
[
"Cavalleri",
"A.",
""
],
[
"Da Lio",
"M.",
""
],
[
"Dolesi",
"R.",
""
],
[
"Hoyle",
"C. D.",
""
],
[
"Hueller",
"M.",
""
],
[
"Vitale",
"S.",... | The LTP (LISA Testflight Package), to be flown aboard the ESA / NASA LISA Pathfinder mission, aims to demonstrate drag-free control for LISA test masses with acceleration noise below 30 fm/s^2/Hz^1/2 from 1-30 mHz. This paper describes the LTP measurement of random, position independent forces acting on the test masses... |
1507.07257 | S Habib Mazharimousavi | S. Habib Mazharimousavi and M. Halilsoy | 2+1-dimensional wormhole from a doublet of scalar fields | 6 pages, 4 figures, final version published in PRD | Phys. Rev. D 92, 024040 (2015) | 10.1103/PhysRevD.92.024040 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a class of exact solutions in the framework of $2+1-$dimensional
Einstein gravity coupled minimally to a doublet of scalar fields. Our solution
can be interpreted upon tuning of parameters as an asymptotically flat wormhole
as well as a particle model in $2+1-$dimensions.
| [
{
"created": "Sun, 26 Jul 2015 22:12:33 GMT",
"version": "v1"
}
] | 2015-07-28 | [
[
"Mazharimousavi",
"S. Habib",
""
],
[
"Halilsoy",
"M.",
""
]
] | We present a class of exact solutions in the framework of $2+1-$dimensional Einstein gravity coupled minimally to a doublet of scalar fields. Our solution can be interpreted upon tuning of parameters as an asymptotically flat wormhole as well as a particle model in $2+1-$dimensions. |
gr-qc/9906119 | Anchordoqui Luis Alfredo | L. A. Anchordoqui, M. L. Trobo, H. Vucetich and F. Zyserman | Gravitational memory of natural wormholes | 14 pages revtex, 1 ps figure | Mod.Phys.Lett. A15 (2000) 429-438 | 10.1142/S0217732300000414 | null | gr-qc | null | A traversable wormhole solution of general scalar-tensor field equations is
presented. We have shown, after a numerical analysis for the behavior of the
scalar field of Brans-Dicke theory, that the solution is completely
singularity--free. Furthermore, the analysis of more general scalar field
dependent coupling cons... | [
{
"created": "Tue, 29 Jun 1999 20:34:41 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Aug 1999 23:18:38 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Anchordoqui",
"L. A.",
""
],
[
"Trobo",
"M. L.",
""
],
[
"Vucetich",
"H.",
""
],
[
"Zyserman",
"F.",
""
]
] | A traversable wormhole solution of general scalar-tensor field equations is presented. We have shown, after a numerical analysis for the behavior of the scalar field of Brans-Dicke theory, that the solution is completely singularity--free. Furthermore, the analysis of more general scalar field dependent coupling consta... |
1012.3894 | Manuel Tessmer | Manuel Tessmer and Gerhard Schaefer | Full-analytic frequency-domain gravitational wave forms from eccentric
compact binaries to 2PN accuracy | 48 pages | Ann. Phys. (Berlin) 523 (2011) 813-864 | 10.1002/andp.201100007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The article provides full-analytic gravitational wave (GW) forms for
eccentric nonspinning compact binaries of arbitrary mass ratio in the time
Fourier domain. The semi-analytical property of recent descriptions, i.e. the
demand of inverting the higher-order Kepler equation numerically but keeping
all other computati... | [
{
"created": "Fri, 17 Dec 2010 14:43:47 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Apr 2011 12:29:38 GMT",
"version": "v2"
}
] | 2013-03-25 | [
[
"Tessmer",
"Manuel",
""
],
[
"Schaefer",
"Gerhard",
""
]
] | The article provides full-analytic gravitational wave (GW) forms for eccentric nonspinning compact binaries of arbitrary mass ratio in the time Fourier domain. The semi-analytical property of recent descriptions, i.e. the demand of inverting the higher-order Kepler equation numerically but keeping all other computation... |
1602.04524 | Gustav Holzegel | Gustav Holzegel | Conservation laws and flux bounds for gravitational perturbations of the
Schwarzschild metric | 21 pages, 2 figures | null | 10.1088/0264-9381/33/20/205004 | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive an energy conservation law for the system of gravitational
perturbations on the Schwarzschild spacetime expressed in a double null gauge.
The resulting identity involves only first derivatives of the metric
perturbation. Exploiting the gauge invariance up to boundary terms of the
fluxes that appear, we are ... | [
{
"created": "Sun, 14 Feb 2016 23:06:41 GMT",
"version": "v1"
}
] | 2016-10-05 | [
[
"Holzegel",
"Gustav",
""
]
] | We derive an energy conservation law for the system of gravitational perturbations on the Schwarzschild spacetime expressed in a double null gauge. The resulting identity involves only first derivatives of the metric perturbation. Exploiting the gauge invariance up to boundary terms of the fluxes that appear, we are ab... |
gr-qc/0701091 | Ricardo Gallego | Ricardo Gallego Torrome | On a covariant version of Caianiello's Model | 15 pages, no figures; notation clarified and other important changes | Gen.Rel.Grav.39:1833-1845,2007 | 10.1007/s10714-007-0491-6 | null | gr-qc hep-th math-ph math.MP | null | Caianiello's derivation of Quantum Geometry through an isometric embedding of
the spacetime ({\bf M},\tilde{g}) in the pseudo-Riemannian structure ({\bf
T^*M},g^*_{AB}) is reconsidered. In the new derivation, a non-linear connection
and the bundle %%@ formalism induce a Lorentzian-type structure in the
4-dimensional ... | [
{
"created": "Tue, 16 Jan 2007 13:04:42 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Jan 2007 14:26:09 GMT",
"version": "v2"
},
{
"created": "Mon, 22 Jan 2007 12:55:48 GMT",
"version": "v3"
},
{
"created": "Wed, 23 May 2007 07:06:19 GMT",
"version": "v4"
}
] | 2020-12-01 | [
[
"Torrome",
"Ricardo Gallego",
""
]
] | Caianiello's derivation of Quantum Geometry through an isometric embedding of the spacetime ({\bf M},\tilde{g}) in the pseudo-Riemannian structure ({\bf T^*M},g^*_{AB}) is reconsidered. In the new derivation, a non-linear connection and the bundle %%@ formalism induce a Lorentzian-type structure in the 4-dimensional ma... |
1205.6127 | Bianca Dittrich | Bianca Dittrich (Perimeter Institute for Theoretical Physics, Max
Planck Institute for Gravitational Physics) | From the discrete to the continuous - towards a cylindrically consistent
dynamics | 22 pages | null | 10.1088/1367-2630/14/12/123004 | null | gr-qc hep-lat quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Discrete models usually represent approximations to continuum physics.
Cylindrical consistency provides a framework in which discretizations mirror
exactly the continuum limit. Being a standard tool for the kinematics of loop
quantum gravity we propose a coarse graining procedure that aims at
constructing a cylindric... | [
{
"created": "Mon, 28 May 2012 14:30:33 GMT",
"version": "v1"
}
] | 2015-06-05 | [
[
"Dittrich",
"Bianca",
"",
"Perimeter Institute for Theoretical Physics, Max\n Planck Institute for Gravitational Physics"
]
] | Discrete models usually represent approximations to continuum physics. Cylindrical consistency provides a framework in which discretizations mirror exactly the continuum limit. Being a standard tool for the kinematics of loop quantum gravity we propose a coarse graining procedure that aims at constructing a cylindrical... |
0707.0579 | Vincenzo Galdi | Vincenzo Pierro, Vincenzo Galdi, Giuseppe Castaldi, Innocenzo M.
Pinto, Juri Agresti, and Riccardo DeSalvo | Perspectives on Beam-Shaping Optimization for Thermal-Noise Reduction in
Advanced Gravitational-Wave Interferometric Detectors: Bounds, Profiles, and
Critical Parameters | 12 pages, 9 figures, 2 tables | Phys.Rev.D76:122003,2007 | 10.1103/PhysRevD.76.122003 | LIGO-P070066-01-Z | gr-qc | null | Suitable shaping (in particular, flattening and broadening) of the laser beam
has recently been proposed as an effective device to reduce internal (mirror)
thermal noise in advanced gravitational wave interferometric detectors. Based
on some recently published analytic approximations (valid in the
infinite-test-mass ... | [
{
"created": "Wed, 4 Jul 2007 15:31:10 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Pierro",
"Vincenzo",
""
],
[
"Galdi",
"Vincenzo",
""
],
[
"Castaldi",
"Giuseppe",
""
],
[
"Pinto",
"Innocenzo M.",
""
],
[
"Agresti",
"Juri",
""
],
[
"DeSalvo",
"Riccardo",
""
]
] | Suitable shaping (in particular, flattening and broadening) of the laser beam has recently been proposed as an effective device to reduce internal (mirror) thermal noise in advanced gravitational wave interferometric detectors. Based on some recently published analytic approximations (valid in the infinite-test-mass li... |
2004.07105 | Andrea Campolongo | Andrea Campolongo, Giovanni Montani | The Role of Entropy in the Evolutionary Quantization of the Isotropic
Universe | null | null | 10.1140/epjc/s10052-020-08544-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we analyze the dynamics of an isotropic closed Universe in the
presence of a cosmological constant term and we compare its behavior in the
standard Wheeler-DeWitt equation approach with the one when a Lagrangian fluid
is considered in the spirit of the Kuchar-Brown paradigm. In particular, we
compare t... | [
{
"created": "Wed, 15 Apr 2020 14:14:00 GMT",
"version": "v1"
}
] | 2020-12-02 | [
[
"Campolongo",
"Andrea",
""
],
[
"Montani",
"Giovanni",
""
]
] | In this paper, we analyze the dynamics of an isotropic closed Universe in the presence of a cosmological constant term and we compare its behavior in the standard Wheeler-DeWitt equation approach with the one when a Lagrangian fluid is considered in the spirit of the Kuchar-Brown paradigm. In particular, we compare the... |
2305.10478 | Leah Jenks | Leah Jenks, Lyla Choi, Macarena Lagos, and Nicol\'as Yunes | Parameterized Parity Violation in Gravitational Wave Propagation | 19 pages | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational parity violation arises in a variety of theories beyond general
relativity. Gravitational waves in such theories have their propagation
altered, leading to birefringence effects in both the amplitude and speed of
the wave. In this work, we introduce a generalized, theory-motivated
parametrization scheme... | [
{
"created": "Wed, 17 May 2023 18:00:00 GMT",
"version": "v1"
}
] | 2023-05-19 | [
[
"Jenks",
"Leah",
""
],
[
"Choi",
"Lyla",
""
],
[
"Lagos",
"Macarena",
""
],
[
"Yunes",
"Nicolás",
""
]
] | Gravitational parity violation arises in a variety of theories beyond general relativity. Gravitational waves in such theories have their propagation altered, leading to birefringence effects in both the amplitude and speed of the wave. In this work, we introduce a generalized, theory-motivated parametrization scheme t... |
2210.14106 | M\'ario Raia Neto Raia | M\'ario Raia Neto, Daniela P\'erez, Joaqu\'in Pelle | The Shadow of Charged Traversable Wormholes | 19 pages, 3 figures, accepted for publication in International
Journal of Modern Physics D | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We compute the shadow cast by a charged Morris-Thorne wormhole when the light
source is a star located beyond the mouth which is opposite to the observer.
First, we provide an extensive analysis of the geodesic properties of the
spacetime, both for null and massive particles. The geometrical properties of
this soluti... | [
{
"created": "Tue, 25 Oct 2022 15:44:15 GMT",
"version": "v1"
}
] | 2022-10-26 | [
[
"Neto",
"Mário Raia",
""
],
[
"Pérez",
"Daniela",
""
],
[
"Pelle",
"Joaquín",
""
]
] | We compute the shadow cast by a charged Morris-Thorne wormhole when the light source is a star located beyond the mouth which is opposite to the observer. First, we provide an extensive analysis of the geodesic properties of the spacetime, both for null and massive particles. The geometrical properties of this solution... |
gr-qc/9812034 | Antonio Campos | Antonio Campos and B. L. Hu | Fluctuations in a Thermal Field and Dissipation of a Black Hole
Spacetime: Far-Field Limit | To appear in the proceedings of the Conference on Quantum Gravity in
the Southern Cone | Int.J.Theor.Phys.38:1253-1271,1999 | 10.1023/A:1026670816596 | null | gr-qc | null | We study the back reaction of a thermal field in a weak gravitational
background depicting the far-field limit of a black hole enclosed in a box by
the Close Time Path (CTP) effective action and the influence functional method.
We derive the noise and dissipation kernels of this system in terms of
quantities in quasi... | [
{
"created": "Thu, 10 Dec 1998 18:38:43 GMT",
"version": "v1"
}
] | 2011-04-15 | [
[
"Campos",
"Antonio",
""
],
[
"Hu",
"B. L.",
""
]
] | We study the back reaction of a thermal field in a weak gravitational background depicting the far-field limit of a black hole enclosed in a box by the Close Time Path (CTP) effective action and the influence functional method. We derive the noise and dissipation kernels of this system in terms of quantities in quasi-e... |
0804.3222 | Lode Wylleman | Lode Wylleman | Algebraically general, gravito-electric rotating dust | 10 pages, changed to revtex style, extended discussion section, minor
corrections | null | 10.1051/eas:0830034 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The class of gravito-electric, algebraically general, rotating `silent' dust
space-times is studied. The main invariant properties are deduced. The number
$t_0$ of functionally independent zero-order Riemann invariants satisfies
$1\leq t_0\leq 2$ and special attention is given to the subclass $t_0=1$.
Whereas there a... | [
{
"created": "Sun, 20 Apr 2008 23:26:57 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Jun 2008 22:14:18 GMT",
"version": "v2"
}
] | 2009-11-13 | [
[
"Wylleman",
"Lode",
""
]
] | The class of gravito-electric, algebraically general, rotating `silent' dust space-times is studied. The main invariant properties are deduced. The number $t_0$ of functionally independent zero-order Riemann invariants satisfies $1\leq t_0\leq 2$ and special attention is given to the subclass $t_0=1$. Whereas there are... |
0910.4066 | Michael Bebronne | Michael V. Bebronne | Theoretical and phenomenological aspects of theories with massive
gravitons | PhD thesis, 116 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this thesis, we study three aspects of theories with massive gravitational
waves. In the first part, we review to problems and issues of theories with
massive gravitons before introducing models where Lorentz invariance is
spontaneously broken by the vacuum expectation value of four scalar fields. In
the second pa... | [
{
"created": "Wed, 21 Oct 2009 12:14:54 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Bebronne",
"Michael V.",
""
]
] | In this thesis, we study three aspects of theories with massive gravitational waves. In the first part, we review to problems and issues of theories with massive gravitons before introducing models where Lorentz invariance is spontaneously broken by the vacuum expectation value of four scalar fields. In the second part... |
1210.1891 | Larne Pekowsky | Larne Pekowsky, James Healy, Deirdre Shoemaker, Pablo Laguna | Impact of Higher-order Modes on the Detection of Binary Black Hole
Coalescences | null | null | 10.1103/PhysRevD.87.084008 | NSF-KITP-12-174 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The inspiral and merger of black-hole binary systems are a promising source
of gravitational waves. The most effective method to look for a signal with a
well understood waveform, such as the binary black hole signal, is matched
filtering against a library of model waveforms. Current model waveforms are
comprised sol... | [
{
"created": "Fri, 5 Oct 2012 23:30:51 GMT",
"version": "v1"
}
] | 2014-05-15 | [
[
"Pekowsky",
"Larne",
""
],
[
"Healy",
"James",
""
],
[
"Shoemaker",
"Deirdre",
""
],
[
"Laguna",
"Pablo",
""
]
] | The inspiral and merger of black-hole binary systems are a promising source of gravitational waves. The most effective method to look for a signal with a well understood waveform, such as the binary black hole signal, is matched filtering against a library of model waveforms. Current model waveforms are comprised solel... |
1508.02511 | Francisco Lobo | Tiberiu Harko, Francisco S. N. Lobo, Jos\'e P. Mimoso, Diego Pav\'on | Gravitational induced particle production through a nonminimal
curvature-matter coupling | 15 pages; accepted for publication in the European Physical Journal C | Eur. Phys. J. C 75 (2015) 386 | 10.1140/epjc/s10052-015-3620-5 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the possibility of a gravitationally induced particle production
through the mechanism of a nonminimal curvature-matter coupling. An interesting
feature of this gravitational theory is that the divergence of the
energy-momentum tensor is nonzero. As a first step in our study we reformulate
the model in te... | [
{
"created": "Tue, 11 Aug 2015 08:03:18 GMT",
"version": "v1"
}
] | 2015-08-31 | [
[
"Harko",
"Tiberiu",
""
],
[
"Lobo",
"Francisco S. N.",
""
],
[
"Mimoso",
"José P.",
""
],
[
"Pavón",
"Diego",
""
]
] | We consider the possibility of a gravitationally induced particle production through the mechanism of a nonminimal curvature-matter coupling. An interesting feature of this gravitational theory is that the divergence of the energy-momentum tensor is nonzero. As a first step in our study we reformulate the model in term... |
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