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gr-qc/0005120 | Diego M. Forni | Diego M. Forni, Mirta Iriondo and Carlos N. Kozameh | Null surfaces formulation in 3D | 15 pp., 4 figures, to appear in J. Math. Phys | J.Math.Phys. 41 (2000) 5517-5534 | 10.1063/1.533422 | null | gr-qc | null | The Null Surface Formulation of General Relativity is developed for 2+1
dimensional gravity. The geometrical meaning of the metricity condition is
analyzed and two approaches to the derivation of the field equations are
presented. One method makes explicit use of the conformal factor while the
other only uses conform... | [
{
"created": "Fri, 26 May 2000 22:13:26 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Forni",
"Diego M.",
""
],
[
"Iriondo",
"Mirta",
""
],
[
"Kozameh",
"Carlos N.",
""
]
] | The Null Surface Formulation of General Relativity is developed for 2+1 dimensional gravity. The geometrical meaning of the metricity condition is analyzed and two approaches to the derivation of the field equations are presented. One method makes explicit use of the conformal factor while the other only uses conformal... |
1404.0006 | Adam Solomon | Yashar Akrami, Tomi S. Koivisto, Adam R. Solomon | The nature of spacetime in bigravity: two metrics or none? | 4 pages, no figures | Gen. Relativ. Gravit. 47 (2015) 1838 | 10.1007/s10714-014-1838-4 | NORDITA-2014-41 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The possibility of matter coupling to two metrics at once is considered. This
appears natural in the most general ghost-free, bimetric theory of gravity,
where it unlocks an additional symmetry with respect to the exchange of the
metrics. This double coupling, however, raises the problem of identifying the
observable... | [
{
"created": "Mon, 31 Mar 2014 20:00:04 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Aug 2014 00:19:56 GMT",
"version": "v2"
}
] | 2015-11-10 | [
[
"Akrami",
"Yashar",
""
],
[
"Koivisto",
"Tomi S.",
""
],
[
"Solomon",
"Adam R.",
""
]
] | The possibility of matter coupling to two metrics at once is considered. This appears natural in the most general ghost-free, bimetric theory of gravity, where it unlocks an additional symmetry with respect to the exchange of the metrics. This double coupling, however, raises the problem of identifying the observables ... |
1006.1169 | Subenoy Chakraborty | Subenoy Chakraborty, Ritabrata Biswas, Nairwita Mazumder | Unified First Law and Some Comments | 5 pages | Nuovo Cim.B125:1209-1214,2011 | 10.1393/ncb/i2010-10912-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this small article, unified first law has been analyzed and some results
have been deduced from it. The results have been presented in the form of
lemmas and some conclusions have been drawn from them.
| [
{
"created": "Mon, 7 Jun 2010 04:06:51 GMT",
"version": "v1"
}
] | 2011-04-12 | [
[
"Chakraborty",
"Subenoy",
""
],
[
"Biswas",
"Ritabrata",
""
],
[
"Mazumder",
"Nairwita",
""
]
] | In this small article, unified first law has been analyzed and some results have been deduced from it. The results have been presented in the form of lemmas and some conclusions have been drawn from them. |
gr-qc/0103021 | T. R. Mongan | T. R. Mongan | A simple quantum cosmology | To be published in General Relativity and Gravitation, August 2001 | Gen.Rel.Grav. 33 (2001) 1415-1424 | 10.1023/A:1012065826750 | null | gr-qc astro-ph hep-ph | null | A simple and surprisingly realistic model of the origin of the universe can
be developed using the Friedmann equation from general relativity, elementary
quantum mechanics, and the experimental values of h, c, G and the proton mass.
The model assumes there are N space dimensions (with N > 6) and the potential
constra... | [
{
"created": "Thu, 8 Mar 2001 00:27:05 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Mongan",
"T. R.",
""
]
] | A simple and surprisingly realistic model of the origin of the universe can be developed using the Friedmann equation from general relativity, elementary quantum mechanics, and the experimental values of h, c, G and the proton mass. The model assumes there are N space dimensions (with N > 6) and the potential constrain... |
1106.2411 | Muhammad Sharif | M. Sharif | The Pseudo-Newtonian Force and Potential of the Stringy Black Holes | 8 pages, accepted for publication in Romanian J. Physics | Rom. J. Phys. 56(2011)1035-1040 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is devoted to investigate the structure of the pseudo-Newtonian
force and potential of the stringy black holes. We discuss conditions for the
force character from an attractive to repulsive. It is also found that the
force will reach a maximum under certain conditions. Also, the ratio of mass
and charge is... | [
{
"created": "Mon, 13 Jun 2011 10:36:07 GMT",
"version": "v1"
}
] | 2011-09-29 | [
[
"Sharif",
"M.",
""
]
] | This paper is devoted to investigate the structure of the pseudo-Newtonian force and potential of the stringy black holes. We discuss conditions for the force character from an attractive to repulsive. It is also found that the force will reach a maximum under certain conditions. Also, the ratio of mass and charge is e... |
2202.05266 | Vishnu Jejjala | Vishnu Jejjala, Michael Kavic, Djordje Minic, Tatsu Takeuchi | First Principles Phenomenology of $H_0$ | 15 pages, 1 figure, LaTeX | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this letter we discuss infinite statistics and motivate its role in
quantum gravity. Then, we connect infinite statistics to a dynamical form of
dark energy, and we obtain an expression for the evolution of the Hubble
parameter that we compare to observation. The equation of state parameter
$w_{eff} < -1$ in this ... | [
{
"created": "Thu, 10 Feb 2022 18:59:59 GMT",
"version": "v1"
}
] | 2022-02-11 | [
[
"Jejjala",
"Vishnu",
""
],
[
"Kavic",
"Michael",
""
],
[
"Minic",
"Djordje",
""
],
[
"Takeuchi",
"Tatsu",
""
]
] | In this letter we discuss infinite statistics and motivate its role in quantum gravity. Then, we connect infinite statistics to a dynamical form of dark energy, and we obtain an expression for the evolution of the Hubble parameter that we compare to observation. The equation of state parameter $w_{eff} < -1$ in this fr... |
0902.0911 | Sergiu I. Vacaru | Sergiu I. Vacaru | Nonholomic Distributions and Gauge Models of Einstein Gravity | v4,latex2e, 39 pages, accepted for IJGMMP 7 (2010) | Int.J.Geom.Meth.Mod.Phys.7:215-246,2010 | null | null | gr-qc hep-th math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For (2+2)-dimensional nonholonomic distributions, the physical information
contained into a spacetime (pseudo) Riemannian metric can be encoded
equivalently into new types of geometric structures and linear connections
constructed as nonholonomic deformations of the Levi-Civita connection. Such
deformations and induc... | [
{
"created": "Thu, 5 Feb 2009 20:16:56 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Feb 2009 21:53:30 GMT",
"version": "v2"
},
{
"created": "Tue, 17 Feb 2009 02:41:10 GMT",
"version": "v3"
},
{
"created": "Sat, 21 Nov 2009 20:35:36 GMT",
"version": "v4"
}
] | 2010-04-08 | [
[
"Vacaru",
"Sergiu I.",
""
]
] | For (2+2)-dimensional nonholonomic distributions, the physical information contained into a spacetime (pseudo) Riemannian metric can be encoded equivalently into new types of geometric structures and linear connections constructed as nonholonomic deformations of the Levi-Civita connection. Such deformations and induced... |
gr-qc/0611097 | Simone Speziale | Jonathan Hackett and Simone Speziale | Grasping rules and semiclassical limit of the geometry in the
Ponzano-Regge model | 18 pages, 1 figure | Class.Quant.Grav.24:1525-1546,2007 | 10.1088/0264-9381/24/6/010 | null | gr-qc | null | We show how the expectation values of geometrical quantities in 3d quantum
gravity can be explicitly computed using grasping rules. We compute the volume
of a labelled tetrahedron using the triple grasping. We show that the large
spin expansion of this value is dominated by the classical expression, and we
study the ... | [
{
"created": "Fri, 17 Nov 2006 20:46:10 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Hackett",
"Jonathan",
""
],
[
"Speziale",
"Simone",
""
]
] | We show how the expectation values of geometrical quantities in 3d quantum gravity can be explicitly computed using grasping rules. We compute the volume of a labelled tetrahedron using the triple grasping. We show that the large spin expansion of this value is dominated by the classical expression, and we study the ne... |
2107.05269 | Florencia Anabella Teppa Pannia | Florencia Anabella Teppa Pannia, Santiago Esteban Perez Bergliaffa and
Nelson Pinto-Neto | Particle Production in Accelerated Thin Bubbles | 14 pages, 3 figures | null | null | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We investigate the creation of scalar particles inside a region delimited by
a bubble which is expanding with non-zero acceleration. The bubble is modelled
as a thin shell and plays the role of a moving boundary, thus influencing the
fluctuations of the test scalar field inside it. Bubbles expanding in Minkowski
spac... | [
{
"created": "Mon, 12 Jul 2021 09:04:15 GMT",
"version": "v1"
}
] | 2021-07-13 | [
[
"Pannia",
"Florencia Anabella Teppa",
""
],
[
"Bergliaffa",
"Santiago Esteban Perez",
""
],
[
"Pinto-Neto",
"Nelson",
""
]
] | We investigate the creation of scalar particles inside a region delimited by a bubble which is expanding with non-zero acceleration. The bubble is modelled as a thin shell and plays the role of a moving boundary, thus influencing the fluctuations of the test scalar field inside it. Bubbles expanding in Minkowski spacet... |
2305.07595 | Gustavo Brito | Gustavo P. de Brito, Astrid Eichhorn, Ludivine Fausten | Towards a bound on the Higgs mass in causal set quantum gravity | null | null | null | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the Standard Model of particle physics, the mass of the Higgs particle can
be linked to the scale at which the Standard Model breaks down due to a Landau
pole/triviality problem: for a Higgs mass somewhat higher than the measured
value, the Standard Model breaks down before the Planck scale. We take a first
step t... | [
{
"created": "Fri, 12 May 2023 16:40:57 GMT",
"version": "v1"
}
] | 2023-05-15 | [
[
"de Brito",
"Gustavo P.",
""
],
[
"Eichhorn",
"Astrid",
""
],
[
"Fausten",
"Ludivine",
""
]
] | In the Standard Model of particle physics, the mass of the Higgs particle can be linked to the scale at which the Standard Model breaks down due to a Landau pole/triviality problem: for a Higgs mass somewhat higher than the measured value, the Standard Model breaks down before the Planck scale. We take a first step tow... |
2001.01281 | Yannick Herfray | Yannick Herfray | Asymptotic Shear and the Intrinsic Conformal Geometry of Null-Infinity | This is the version accepted for publication: Extra references and
corrected a few typos | Journal of Mathematical Physics 61, 072502 (2020) | 10.1063/5.0003616 | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we propose a new geometrization of the radiative phase space
of asymptotically flat space-times: we show that the geometry induced on
null-infinity by the presence of gravitational waves can be understood to be a
generalisation of the tractor calculus of conformal manifolds adapted to the
case of dege... | [
{
"created": "Sun, 5 Jan 2020 18:08:59 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Jan 2020 19:45:19 GMT",
"version": "v2"
},
{
"created": "Thu, 27 Aug 2020 08:22:57 GMT",
"version": "v3"
}
] | 2020-08-28 | [
[
"Herfray",
"Yannick",
""
]
] | In this article we propose a new geometrization of the radiative phase space of asymptotically flat space-times: we show that the geometry induced on null-infinity by the presence of gravitational waves can be understood to be a generalisation of the tractor calculus of conformal manifolds adapted to the case of degene... |
0807.1640 | Francisco Lobo | Francisco S. N. Lobo | The dark side of gravity: Modified theories of gravity | 17 pages, invited chapter to appear in an edited collection 'Dark
Energy-Current Advances and Ideas' | Dark Energy-Current Advances and Ideas, 173-204 (2009), Research
Signpost, ISBN 978-81-308-0341-8 | null | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Modern astrophysical and cosmological models are faced with two severe
theoretical difficulties, that can be summarized as the dark energy and the
dark matter problems. Relative to the former, it has been stated that cosmology
has entered a 'golden age', in which high-precision observational data have
confirmed with ... | [
{
"created": "Thu, 10 Jul 2008 12:59:04 GMT",
"version": "v1"
}
] | 2013-08-23 | [
[
"Lobo",
"Francisco S. N.",
""
]
] | Modern astrophysical and cosmological models are faced with two severe theoretical difficulties, that can be summarized as the dark energy and the dark matter problems. Relative to the former, it has been stated that cosmology has entered a 'golden age', in which high-precision observational data have confirmed with st... |
gr-qc/0212115 | Kazuyasu Shigemoto | M.Kenmoku and K.Shigemoto | Conservation of Energy in Black Holes and in Cosmology | 11 pages, talk given at 11th Theoretical and Experimental Problems of
General Relativity and Gravitation, Tomsk, Russia, July, 2002 | Grav.Cosmol. 9 (2003) 55-58 | null | null | gr-qc | null | We first review the various definition of the total energy in the
gravitational system. The naive definition has some defects, and we review how
to modify the definition of the total energy. Then we explicitly demonstrate
how to calculate the total energy of the system. Our example is the total
energy of a black hole... | [
{
"created": "Fri, 27 Dec 2002 11:39:32 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kenmoku",
"M.",
""
],
[
"Shigemoto",
"K.",
""
]
] | We first review the various definition of the total energy in the gravitational system. The naive definition has some defects, and we review how to modify the definition of the total energy. Then we explicitly demonstrate how to calculate the total energy of the system. Our example is the total energy of a black hole i... |
1910.08008 | Matt Visser | Petarpa Boonserm, Tritos Ngampitipan, Alex Simpson, and Matt Visser | Decomposition of total stress-energy for the generalised Kiselev black
hole | 17 pages | Phys. Rev. D 101, 024022 (2020) | 10.1103/PhysRevD.101.024022 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate that the anisotropic stress-energy supporting the Kiselev
black hole can be mimicked by being split into a perfect fluid component plus
either an electromagnetic component or a scalar field component, thereby
quantifying the precise extent to which the Kiselev black hole fails to
represent a perfect fl... | [
{
"created": "Thu, 17 Oct 2019 16:27:10 GMT",
"version": "v1"
}
] | 2020-01-15 | [
[
"Boonserm",
"Petarpa",
""
],
[
"Ngampitipan",
"Tritos",
""
],
[
"Simpson",
"Alex",
""
],
[
"Visser",
"Matt",
""
]
] | We demonstrate that the anisotropic stress-energy supporting the Kiselev black hole can be mimicked by being split into a perfect fluid component plus either an electromagnetic component or a scalar field component, thereby quantifying the precise extent to which the Kiselev black hole fails to represent a perfect flui... |
2301.13263 | Bita Farsi | Ahmad Sheykhi, Bita Farsi | Growth of perturbations in higher dimensional Gauss-Bonnet FRW cosmology | 10 Pages, 11 figures. arXiv admin note: text overlap with
arXiv:2202.04118 | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We explore the influences of the higher order Gauss Bonnet (GB) correction
terms on the growth of perturbations at the early stage of a (n +
1)-dimensional Friedmann-Robertson-Walker (FRW) universe. Considering a
cosmological constant in the FRW background, we study the linear perturbations
by adopting the sphericall... | [
{
"created": "Mon, 30 Jan 2023 20:15:34 GMT",
"version": "v1"
},
{
"created": "Wed, 17 May 2023 05:56:02 GMT",
"version": "v2"
},
{
"created": "Sat, 12 Aug 2023 09:52:55 GMT",
"version": "v3"
}
] | 2023-08-15 | [
[
"Sheykhi",
"Ahmad",
""
],
[
"Farsi",
"Bita",
""
]
] | We explore the influences of the higher order Gauss Bonnet (GB) correction terms on the growth of perturbations at the early stage of a (n + 1)-dimensional Friedmann-Robertson-Walker (FRW) universe. Considering a cosmological constant in the FRW background, we study the linear perturbations by adopting the spherically ... |
1005.5234 | Kazuharu Bamba | Kazuharu Bamba and Chao-Qiang Geng | Thermodynamics in $f(R)$ gravity in the Palatini formalism | 20 pages, no figure, accepted in JCAP | JCAP 1006:014,2010 | 10.1088/1475-7516/2010/06/014 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate thermodynamics of the apparent horizon in $f(R)$ gravity in
the Palatini formalism with non-equilibrium and equilibrium descriptions. We
demonstrate that it is more transparent to understand the horizon entropy in
the equilibrium framework than that in the non-equilibrium one. Furthermore, we
show that... | [
{
"created": "Fri, 28 May 2010 08:20:05 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Bamba",
"Kazuharu",
""
],
[
"Geng",
"Chao-Qiang",
""
]
] | We investigate thermodynamics of the apparent horizon in $f(R)$ gravity in the Palatini formalism with non-equilibrium and equilibrium descriptions. We demonstrate that it is more transparent to understand the horizon entropy in the equilibrium framework than that in the non-equilibrium one. Furthermore, we show that t... |
1607.00199 | K\'aroly Zolt\'an Csuk\'as | K\'aroly Zolt\'an Csuk\'as | Geometric inequalities in spherically symmetric spacetimes | 13 pages | Gen Relativ Gravit, 49: 94 (2017) | 10.1007/s10714-017-2256-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In geometric inequalities ADM mass plays more fundamental role than the
concept of quasi-local mass. This paper is to demonstrate that using the
quasi-local mass some new insights can be acquired. In spherically symmetric
spacetimes the Misner-Sharp mass and the concept of the Kodama vector field
provides an ideal se... | [
{
"created": "Fri, 1 Jul 2016 10:37:59 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Apr 2017 12:45:35 GMT",
"version": "v2"
}
] | 2017-06-28 | [
[
"Csukás",
"Károly Zoltán",
""
]
] | In geometric inequalities ADM mass plays more fundamental role than the concept of quasi-local mass. This paper is to demonstrate that using the quasi-local mass some new insights can be acquired. In spherically symmetric spacetimes the Misner-Sharp mass and the concept of the Kodama vector field provides an ideal sett... |
gr-qc/0102036 | null | M. Sharif (Hanyang University) | Energy and Momentum of a Class of Rotating Gravitational Waves | 11 pages, no figure, Latex | Int.J.Mod.Phys.A17:1175-1182,2002 | 10.1142/S0217751X02009655 | null | gr-qc | null | We calculate energy and momentum for a class of cylindrical rotating
gravitational waves using Einstein and Papapetrou's prescriptions. It is shown
that the results obtained are reduced to the special case of the cylindrical
gravitational waves already available in the literature.
| [
{
"created": "Fri, 9 Feb 2001 00:26:27 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Sharif",
"M.",
"",
"Hanyang University"
]
] | We calculate energy and momentum for a class of cylindrical rotating gravitational waves using Einstein and Papapetrou's prescriptions. It is shown that the results obtained are reduced to the special case of the cylindrical gravitational waves already available in the literature. |
gr-qc/9706073 | Sharon Morsink | John L. Friedman, Sharon M. Morsink | Axial instability of rotating relativistic stars | Latex, 18 pages. Equations 84 and 85 are corrected. Discussion of
timescales is corrected and updated | Astrophys.J. 502 (1998) 714-720 | 10.1086/305920 | null | gr-qc astro-ph | null | Perturbations of rotating relativistic stars can be classified by their
behavior under parity. For axial perturbations (r-modes), initial data with
negative canonical energy is found with angular dependence $e^{im\phi}$ for all
values of $m\geq 2$ and for arbitrarily slow rotation. This implies instability
(or margin... | [
{
"created": "Mon, 23 Jun 1997 23:35:38 GMT",
"version": "v1"
},
{
"created": "Sun, 19 Oct 1997 23:08:29 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Jun 1998 14:21:00 GMT",
"version": "v3"
}
] | 2009-10-30 | [
[
"Friedman",
"John L.",
""
],
[
"Morsink",
"Sharon M.",
""
]
] | Perturbations of rotating relativistic stars can be classified by their behavior under parity. For axial perturbations (r-modes), initial data with negative canonical energy is found with angular dependence $e^{im\phi}$ for all values of $m\geq 2$ and for arbitrarily slow rotation. This implies instability (or marginal... |
gr-qc/0405035 | Philip D. Mannheim | Philip D. Mannheim (University of Connecticut) | The Work of Behram Kursunoglu | 8 pages, latex using ws-procs9x6.cls, talk presented at the 2003
Coral Gables conference | null | 10.1142/9789812701992_0053 | null | gr-qc | null | Talk presented at the 2003 Coral Gables conference in honor and appreciation
of the work of Professor Behram Kursunoglu, general relativist extraordinaire
and founder of the Coral Gables series of conferences, whose untimely death
occurred shortly before the 2003 conference.
| [
{
"created": "Thu, 6 May 2004 19:01:34 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Mannheim",
"Philip D.",
"",
"University of Connecticut"
]
] | Talk presented at the 2003 Coral Gables conference in honor and appreciation of the work of Professor Behram Kursunoglu, general relativist extraordinaire and founder of the Coral Gables series of conferences, whose untimely death occurred shortly before the 2003 conference. |
1804.08195 | Luca Buoninfante | Luca Buoninfante, Alexey S. Koshelev, Gaetano Lambiase, Jo\~ao Marto,
Anupam Mazumdar | Conformally-flat, non-singular static metric in infinite derivative
gravity | 24 pages. Revised version, stronger arguments presented for avoiding
singularity and event horizon | null | 10.1088/1475-7516/2018/06/014 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In Einstein's theory of general relativity the vacuum solution yields a
blackhole with a curvature singularity, where there exists a point-like source
with a Dirac delta distribution which is introduced as a boundary condition in
the static case. It has been known for a while that ghost-free infinite
derivative theor... | [
{
"created": "Sun, 22 Apr 2018 23:38:34 GMT",
"version": "v1"
},
{
"created": "Sat, 12 May 2018 17:06:26 GMT",
"version": "v2"
}
] | 2018-06-27 | [
[
"Buoninfante",
"Luca",
""
],
[
"Koshelev",
"Alexey S.",
""
],
[
"Lambiase",
"Gaetano",
""
],
[
"Marto",
"João",
""
],
[
"Mazumdar",
"Anupam",
""
]
] | In Einstein's theory of general relativity the vacuum solution yields a blackhole with a curvature singularity, where there exists a point-like source with a Dirac delta distribution which is introduced as a boundary condition in the static case. It has been known for a while that ghost-free infinite derivative theory ... |
gr-qc/9803091 | Aleksandr Zheltukhin | Semyon Pol'shin | Group Theoretical Examination of the Relativistic Wave Equations on
Curved Spaces. I.Basic Principles | 11 pages, LATEX, no figures, revised version | null | null | null | gr-qc | null | The basic principles of generalization of the group theoretical approach to
the relativistic wave equations on curved spaces are examined. The general
method of the determination of wave equations from the known symmetry group of
a symmetrical curved space is described. The method of obtaining the
symmetrical spaces ... | [
{
"created": "Fri, 27 Mar 1998 15:08:13 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Jul 1998 14:39:05 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Pol'shin",
"Semyon",
""
]
] | The basic principles of generalization of the group theoretical approach to the relativistic wave equations on curved spaces are examined. The general method of the determination of wave equations from the known symmetry group of a symmetrical curved space is described. The method of obtaining the symmetrical spaces in... |
1108.2813 | George E. A. Matsas | Jorge Castineiras, Emerson B. S. Correa, Luis C. B. Crispino, George
E. A. Matsas | Quantization of the Proca field in the Rindler wedge and the interaction
of uniformly accelerated currents with massive vector bosons from the Unruh
thermal bath | 5 pages, no figures | Phys.Rev.D84:025010,2011 | 10.1103/PhysRevD.84.025010 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We canonically quantize the Proca field in the Rindler wedge and compute the
total response rate of a uniformly accelerated current interacting with massive
vector Rindler particles from the Unruh thermal bath. We explicitly verify that
the result obtained is exactly the same as the emission rate of massive vector
pa... | [
{
"created": "Sat, 13 Aug 2011 18:53:49 GMT",
"version": "v1"
}
] | 2011-11-10 | [
[
"Castineiras",
"Jorge",
""
],
[
"Correa",
"Emerson B. S.",
""
],
[
"Crispino",
"Luis C. B.",
""
],
[
"Matsas",
"George E. A.",
""
]
] | We canonically quantize the Proca field in the Rindler wedge and compute the total response rate of a uniformly accelerated current interacting with massive vector Rindler particles from the Unruh thermal bath. We explicitly verify that the result obtained is exactly the same as the emission rate of massive vector part... |
2208.06869 | Job Furtado Neto | T. F. de Souza, A. C. A. Ramos, R. N. Costa Filho, J. Furtado | Generalized Ellis-Bronnikov graphene wormhole | 9 pages, 6 figures, two columns | null | null | null | gr-qc hep-th quant-ph | http://creativecommons.org/licenses/by/4.0/ | In this paper, we investigate the spinless stationary Schr\"odinger equation
for the electron when it is permanently bound to a generalized Ellis-Bronnikov
graphene wormhole-like surface. The curvature gives rise to a geometric
potential affecting thus the electronic dynamics. The geometry of the
wormhole's shape is ... | [
{
"created": "Sun, 14 Aug 2022 15:47:05 GMT",
"version": "v1"
}
] | 2022-08-16 | [
[
"de Souza",
"T. F.",
""
],
[
"Ramos",
"A. C. A.",
""
],
[
"Filho",
"R. N. Costa",
""
],
[
"Furtado",
"J.",
""
]
] | In this paper, we investigate the spinless stationary Schr\"odinger equation for the electron when it is permanently bound to a generalized Ellis-Bronnikov graphene wormhole-like surface. The curvature gives rise to a geometric potential affecting thus the electronic dynamics. The geometry of the wormhole's shape is co... |
1904.05791 | Vasiliy P. Neznamov | V.P.Neznamov, I.I.Safronov, V.Ye.Shemarulin | Stationary solutions of the second-order equation for fermions in
Kerr-Newman space-time | 47 pages, 2 figures, 6 tables | J. Exp. Theor. Phys. (2019) 128:64 | 10.1134/S1063776118120221 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When using the quantum mechanical second-order equation with the effective
potential of the Kerr-Newman (KN) field for fermions, results were obtained
that qualitatively differ from results obtained when using the Dirac equation.
In presence of two event horizons, existence of degenerate stationary bound
states was p... | [
{
"created": "Wed, 10 Apr 2019 16:16:35 GMT",
"version": "v1"
}
] | 2019-04-12 | [
[
"Neznamov",
"V. P.",
""
],
[
"Safronov",
"I. I.",
""
],
[
"Shemarulin",
"V. Ye.",
""
]
] | When using the quantum mechanical second-order equation with the effective potential of the Kerr-Newman (KN) field for fermions, results were obtained that qualitatively differ from results obtained when using the Dirac equation. In presence of two event horizons, existence of degenerate stationary bound states was pro... |
1108.5827 | Changjun Gao | Changjun Gao | Scalar Field, Four Dimensional Spacetime Volume and the Holographic Dark
Energy | 7 pages, 5 figures. References added and some typos corrected | Int. J. Mod. Phys. Conf. Ser. 10 (2012) 95-106 | 10.1142/S2010194512005806 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the cosmic evolution of a scalar field which is identified with
the four dimensional spacetime volume. Given a specific form for the Lagrangian
of the scalar field, a new holographic dark energy model is present. The energy
density of dark energy is reversely proportional to the square of the radius of
the... | [
{
"created": "Tue, 30 Aug 2011 04:33:14 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Aug 2011 00:42:07 GMT",
"version": "v2"
},
{
"created": "Fri, 2 Sep 2011 02:43:06 GMT",
"version": "v3"
},
{
"created": "Mon, 5 Sep 2011 07:07:25 GMT",
"version": "v4"
}
] | 2012-05-22 | [
[
"Gao",
"Changjun",
""
]
] | We explore the cosmic evolution of a scalar field which is identified with the four dimensional spacetime volume. Given a specific form for the Lagrangian of the scalar field, a new holographic dark energy model is present. The energy density of dark energy is reversely proportional to the square of the radius of the c... |
1002.3868 | Sante Carloni Dr | Sante Carloni | Covariant gauge invariant theory of Scalar Perturbations in
$f(R)$-gravity: a brief review | 23 pages, 12 figures, to appear on The Open Astronomy Journal | null | 10.2174/1874381101003010076 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I review the state of the art of the investigation on the structure formation
in $f(R)$-gravity based on the Covariant and Gauge Invariant approach to
perturbations. A critical analysis of the results, in particular the presence
of characteristic signature of these models, together with their meaning and
their implic... | [
{
"created": "Sat, 20 Feb 2010 11:13:04 GMT",
"version": "v1"
}
] | 2015-05-18 | [
[
"Carloni",
"Sante",
""
]
] | I review the state of the art of the investigation on the structure formation in $f(R)$-gravity based on the Covariant and Gauge Invariant approach to perturbations. A critical analysis of the results, in particular the presence of characteristic signature of these models, together with their meaning and their implicat... |
1003.5665 | T. Padmanabhan | T. Padmanabhan | Surface Density of Spacetime Degrees of Freedom from Equipartition Law
in theories of Gravity | v1: 20 pages; no figures. v2: Sec 4 added; 23 pages | Phys.Rev.D81:124040,2010 | 10.1103/PhysRevD.81.124040 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I show that the principle of equipartition, applied to area elements of a
surface which are in equilibrium at the local Davies-Unruh temperature, allows
one to determine the surface number density of the microscopic spacetime
degrees of freedom in any diffeomorphism invariant theory of gravity. The
entropy associated... | [
{
"created": "Mon, 29 Mar 2010 20:05:01 GMT",
"version": "v1"
},
{
"created": "Sat, 26 Jun 2010 06:35:40 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Padmanabhan",
"T.",
""
]
] | I show that the principle of equipartition, applied to area elements of a surface which are in equilibrium at the local Davies-Unruh temperature, allows one to determine the surface number density of the microscopic spacetime degrees of freedom in any diffeomorphism invariant theory of gravity. The entropy associated w... |
2312.15452 | Junji Jia | Qianchuan Wang and Junji Jia | Periapsis shift in spherically symmetric spacetimes and effect of
electric interaction | 17 pages, 9 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The periapsis shift of charged test particles in arbitrary static and
spherically symmetric charged spacetimes are studied. Two perturbative methods,
the near-circular approximation and post-Newtonian methods, are developed, and
shown to be very accurate when the results are found to high orders. The former
method is... | [
{
"created": "Sun, 24 Dec 2023 10:18:10 GMT",
"version": "v1"
}
] | 2023-12-27 | [
[
"Wang",
"Qianchuan",
""
],
[
"Jia",
"Junji",
""
]
] | The periapsis shift of charged test particles in arbitrary static and spherically symmetric charged spacetimes are studied. Two perturbative methods, the near-circular approximation and post-Newtonian methods, are developed, and shown to be very accurate when the results are found to high orders. The former method is m... |
1001.4726 | Dmitri Vassiliev | Olga Chervova and Dmitri Vassiliev | The stationary Weyl equation and Cosserat elasticity | null | J.Phys.A43:335203,2010 | 10.1088/1751-8113/43/33/335203 | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The paper deals with the Weyl equation which is the massless Dirac equation.
We study the Weyl equation in the stationary setting, i.e. when the spinor
field oscillates harmonically in time. We suggest a new geometric
interpretation of the stationary Weyl equation, one which does not require the
use of spinors, Pauli... | [
{
"created": "Tue, 26 Jan 2010 15:41:31 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Chervova",
"Olga",
""
],
[
"Vassiliev",
"Dmitri",
""
]
] | The paper deals with the Weyl equation which is the massless Dirac equation. We study the Weyl equation in the stationary setting, i.e. when the spinor field oscillates harmonically in time. We suggest a new geometric interpretation of the stationary Weyl equation, one which does not require the use of spinors, Pauli m... |
gr-qc/9801008 | F. J. Chinea | F. J. Chinea | New first integral for twisting type-N vacuum gravitational fields with
two non-commuting Killing vectors | 7 pages, LaTeX, uses ioplppt.sty and iopl12.sty; to be published in
Class. Quantum Grav | Class.Quant.Grav. 15 (1998) 367-371 | 10.1088/0264-9381/15/2/011 | null | gr-qc | null | A new first integral for the equations corresponding to twisting type-N
vacuum gravitational fields with two non-commuting Killing vectors is
introduced. A new reduction of the problem to a complex second-order ordinary
differential equation is given. Alternatively, the mentioned first integral can
be used in order t... | [
{
"created": "Mon, 5 Jan 1998 22:18:47 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Chinea",
"F. J.",
""
]
] | A new first integral for the equations corresponding to twisting type-N vacuum gravitational fields with two non-commuting Killing vectors is introduced. A new reduction of the problem to a complex second-order ordinary differential equation is given. Alternatively, the mentioned first integral can be used in order to ... |
gr-qc/0510105 | Lorenzo Iorio | Lorenzo Iorio, Giuseppe Giudice | On the perspectives of testing the Dvali-Gabadadze-Porrati gravity model
with the outer planets of the Solar System | LaTex, 22 pages, 2 tables, 10 figures, 27 references. Reference [17]
added, reference [26] updated, caption of figures changed, small change in
section 1.2 | JCAP 0608:007,2006 | 10.1088/1475-7516/2006/08/007 | null | gr-qc astro-ph hep-ph physics.space-ph | null | The multidimensional braneworld gravity model by Dvali, Gabadadze and Porrati
was primarily put forth to explain the observed acceleration of the expansion
of the Universe without resorting to dark energy. One of the most intriguing
features of such a model is that it also predicts small effects on the orbital
motion... | [
{
"created": "Tue, 25 Oct 2005 12:58:07 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Jun 2006 14:50:00 GMT",
"version": "v2"
},
{
"created": "Mon, 31 Jul 2006 13:10:54 GMT",
"version": "v3"
}
] | 2010-01-27 | [
[
"Iorio",
"Lorenzo",
""
],
[
"Giudice",
"Giuseppe",
""
]
] | The multidimensional braneworld gravity model by Dvali, Gabadadze and Porrati was primarily put forth to explain the observed acceleration of the expansion of the Universe without resorting to dark energy. One of the most intriguing features of such a model is that it also predicts small effects on the orbital motion o... |
1803.09872 | Dennis Lehmkuhl | Dennis Lehmkuhl | General Relativity as a Hybrid theory: The Genesis of Einstein's work on
the problem of motion | null | null | 10.1016/j.shpsb.2017.09.006 | null | gr-qc physics.hist-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper I describe the genesis of Einstein's early work on the problem
of motion in general relativity (GR): the question of whether the motion of
matter subject to gravity can be derived directly from the Einstein field
equations. In addressing this question, Einstein himself always preferred the
vacuum approa... | [
{
"created": "Tue, 27 Mar 2018 03:17:01 GMT",
"version": "v1"
}
] | 2018-03-28 | [
[
"Lehmkuhl",
"Dennis",
""
]
] | In this paper I describe the genesis of Einstein's early work on the problem of motion in general relativity (GR): the question of whether the motion of matter subject to gravity can be derived directly from the Einstein field equations. In addressing this question, Einstein himself always preferred the vacuum approach... |
gr-qc/0110095 | Kechkin O. V. | Oleg V. Kechkin | Generation of the bosonic string theory solutions from the stationary
Einstein fields via projection symmetry | 15 pages in LATEX | Phys.Lett.B523:323-330,2001 | 10.1016/S0370-2693(01)01350-8 | null | gr-qc | null | A new formalism for generation of solutions in the consistently truncated
low-energy bosonic string theory is developed. This formalism gives a
correspondence of the projection type between the theories toroidally
compactified from the diverse to three dimensions. Taking the stationary
Einstein-dilaton gravity as the... | [
{
"created": "Tue, 23 Oct 2001 01:15:38 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Kechkin",
"Oleg V.",
""
]
] | A new formalism for generation of solutions in the consistently truncated low-energy bosonic string theory is developed. This formalism gives a correspondence of the projection type between the theories toroidally compactified from the diverse to three dimensions. Taking the stationary Einstein-dilaton gravity as the t... |
2407.20339 | Ippocratis Saltas Dr | Eugeny Babichev, Christos Charmousis, Benjamin Muntz, Antonio Padilla,
Ippocratis D. Saltas | Horndeski speed tests with scalar-photon couplings | 7 pages plus references | null | null | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit multi-messenger constraints from neutron star mergers on the speed
of propagation of gravitational and electromagnetic waves in Horndeski and
beyond Horndeski theories. By considering non-trivial couplings between the
dark energy field and the electromagnetic sector, the electromagnetic wave can
propagate ... | [
{
"created": "Mon, 29 Jul 2024 18:00:12 GMT",
"version": "v1"
}
] | 2024-07-31 | [
[
"Babichev",
"Eugeny",
""
],
[
"Charmousis",
"Christos",
""
],
[
"Muntz",
"Benjamin",
""
],
[
"Padilla",
"Antonio",
""
],
[
"Saltas",
"Ippocratis D.",
""
]
] | We revisit multi-messenger constraints from neutron star mergers on the speed of propagation of gravitational and electromagnetic waves in Horndeski and beyond Horndeski theories. By considering non-trivial couplings between the dark energy field and the electromagnetic sector, the electromagnetic wave can propagate th... |
1506.08070 | Michael Feldman | Michael R. Feldman and John D. Anderson | On the possible onset of the Pioneer anomaly | 24+12 pages, 4 figures | Int. J. Mod. Phys. D24 (2015) 1550066 | 10.1142/S0218271815500662 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the possibility that the observed onset of the Pioneer anomaly
after Saturn encounter by Pioneer 11 is not necessarily due to mismodeling of
solar radiation pressure but instead reflects a physically relevant
characteristic of the anomaly itself. We employ the principles of a recently
proposed cosmological... | [
{
"created": "Wed, 24 Jun 2015 09:52:42 GMT",
"version": "v1"
}
] | 2015-06-29 | [
[
"Feldman",
"Michael R.",
""
],
[
"Anderson",
"John D.",
""
]
] | We explore the possibility that the observed onset of the Pioneer anomaly after Saturn encounter by Pioneer 11 is not necessarily due to mismodeling of solar radiation pressure but instead reflects a physically relevant characteristic of the anomaly itself. We employ the principles of a recently proposed cosmological m... |
1012.1443 | Ujjal Debnath | Piyali Bagchi Khatua and Ujjal Debnath | Role of Chameleon Field in Accelerating Universe | 10 pages, 8 figures | Astrophys.Space Sci.326:53-60,2010 | 10.1007/s10509-009-0207-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we have considered a model of the flat FRW universe filled with
cold dark matter and Chameleon field where the scale function is taken as, (i)
Intermediate Expansion and (ii) Logamediate Expansion. In the both cases we
find the expressions of Chameleon field, Chameleon potential, statefinder
parameters ... | [
{
"created": "Tue, 7 Dec 2010 10:03:07 GMT",
"version": "v1"
}
] | 2011-09-30 | [
[
"Khatua",
"Piyali Bagchi",
""
],
[
"Debnath",
"Ujjal",
""
]
] | In this work, we have considered a model of the flat FRW universe filled with cold dark matter and Chameleon field where the scale function is taken as, (i) Intermediate Expansion and (ii) Logamediate Expansion. In the both cases we find the expressions of Chameleon field, Chameleon potential, statefinder parameters an... |
1709.08373 | Seramika Ariwahjoedi | Seramika Ariwahjoedi, Freddy P. Zen | (2+1) Regge Calculus: Discrete Curvatures, Bianchi Identity, and
Gauss-Codazzi Equation | 30 pages. 24 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The first results presented in our article are the clear definitions of both
intrinsic and extrinsic discrete curvatures in terms of holonomy and
plane-angle representation, a clear relation with their deficit angles, and
their clear geometrical interpretations in the first order discrete geometry.
The second results... | [
{
"created": "Mon, 25 Sep 2017 08:38:29 GMT",
"version": "v1"
}
] | 2017-09-26 | [
[
"Ariwahjoedi",
"Seramika",
""
],
[
"Zen",
"Freddy P.",
""
]
] | The first results presented in our article are the clear definitions of both intrinsic and extrinsic discrete curvatures in terms of holonomy and plane-angle representation, a clear relation with their deficit angles, and their clear geometrical interpretations in the first order discrete geometry. The second results a... |
1009.0080 | Matt Visser | Jozef Skakala (Victoria University of Wellington) and Matt Visser
(Victoria University of Wellington) | Generic master equations for quasi-normal frequencies | 23 pages; V2: Minor additions, typos fixed. Matches published version | JHEP 1011:070,2010 | 10.1007/JHEP11(2010)070 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Generic master equations governing the highly-damped quasi-normal frequencies
[QNFs] of one-horizon, two-horizon, and even three-horizon spacetimes can be
obtained through either semi-analytic or monodromy techniques. While many
technical details differ, both between the semi-analytic and monodromy
approaches, and qu... | [
{
"created": "Wed, 1 Sep 2010 03:15:57 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Nov 2010 19:22:22 GMT",
"version": "v2"
}
] | 2010-11-26 | [
[
"Skakala",
"Jozef",
"",
"Victoria University of Wellington"
],
[
"Visser",
"Matt",
"",
"Victoria University of Wellington"
]
] | Generic master equations governing the highly-damped quasi-normal frequencies [QNFs] of one-horizon, two-horizon, and even three-horizon spacetimes can be obtained through either semi-analytic or monodromy techniques. While many technical details differ, both between the semi-analytic and monodromy approaches, and quit... |
1912.07278 | Xiangdong Zhang | Cong Zhang and Xiangdong Zhang | Quantum geometry and effective dynamics of Janis-Newman-Winicour
singularities | 17 pages,3 figures, references added. v3, accepted by PRD | Phys. Rev. D 101, 086002 (2020) | 10.1103/PhysRevD.101.086002 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inspired by the recent proposal for the quantum effective dynamics of the
Schwarzschild spacetime given in \cite{AOS1}, we investigate the effective
dynamics of the loop quantized Janis-Newman-Winicour (JNW) spacetime which is
an extension of the Schwarzschild spacetime with an extra minimally coupled
massless scalar... | [
{
"created": "Mon, 16 Dec 2019 10:19:10 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Dec 2019 05:50:39 GMT",
"version": "v2"
},
{
"created": "Tue, 31 Mar 2020 06:48:53 GMT",
"version": "v3"
}
] | 2020-04-07 | [
[
"Zhang",
"Cong",
""
],
[
"Zhang",
"Xiangdong",
""
]
] | Inspired by the recent proposal for the quantum effective dynamics of the Schwarzschild spacetime given in \cite{AOS1}, we investigate the effective dynamics of the loop quantized Janis-Newman-Winicour (JNW) spacetime which is an extension of the Schwarzschild spacetime with an extra minimally coupled massless scalar f... |
2004.06214 | Burin Gumjudpai | Chonticha Kritpetch (IF Naresuan), Candrasyah Muhammad (IF Naresuan)
and Burin Gumjudpai (IF Naresuan and ThEP Center) | Holographic dark energy with non-minimal derivative coupling to gravity
effects | 12 pages, 12 figures | Physics of the Dark Universe, 30, 100712 (2020) | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Non-minimal derivative coupling (NMDC) to gravity in flat FLRW universe is
investigated in the scenario of holographic dark energy. Kinetic term is
coupled to the Einstein tensor under potential $V = (1/2)m^2 \phi^2$. The free
kinetic term is allowed to be canonical and phantom. Gravitational constant is
modified wit... | [
{
"created": "Mon, 13 Apr 2020 21:54:38 GMT",
"version": "v1"
},
{
"created": "Sun, 19 Apr 2020 16:51:27 GMT",
"version": "v2"
},
{
"created": "Sat, 29 Aug 2020 20:09:36 GMT",
"version": "v3"
}
] | 2020-09-01 | [
[
"Kritpetch",
"Chonticha",
"",
"IF Naresuan"
],
[
"Muhammad",
"Candrasyah",
"",
"IF Naresuan"
],
[
"Gumjudpai",
"Burin",
"",
"IF Naresuan and ThEP Center"
]
] | Non-minimal derivative coupling (NMDC) to gravity in flat FLRW universe is investigated in the scenario of holographic dark energy. Kinetic term is coupled to the Einstein tensor under potential $V = (1/2)m^2 \phi^2$. The free kinetic term is allowed to be canonical and phantom. Gravitational constant is modified with ... |
2404.05464 | Mian Zhu | Shingo Akama and Mian Zhu | Parity violation in primordial tensor non-Gaussianities from matter
bounce cosmology | null | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been shown that primordial tensor non-Gaussianities from a cubic Weyl
action with a non-dynamical coupling are suppressed by the so-called slow-roll
parameter in a conventional framework of slow-roll inflation. In this paper, we
consider matter bounce cosmology in which the background spacetime is no longer
qu... | [
{
"created": "Mon, 8 Apr 2024 12:42:02 GMT",
"version": "v1"
}
] | 2024-04-09 | [
[
"Akama",
"Shingo",
""
],
[
"Zhu",
"Mian",
""
]
] | It has been shown that primordial tensor non-Gaussianities from a cubic Weyl action with a non-dynamical coupling are suppressed by the so-called slow-roll parameter in a conventional framework of slow-roll inflation. In this paper, we consider matter bounce cosmology in which the background spacetime is no longer quas... |
gr-qc/9412070 | Joan Masso | Carles Bona, Joan Masso and Joan Stela | Numerical Black Holes: A Moving Grid Approach | 12 pages, LaTeX with RevTeX 3.0 macros, 4 uuencoded gz-compressed
postscript figures. Also available at http://jean-luc.ncsa.uiuc.edu/Papers/
To appear in Physical Review D | Phys.Rev. D51 (1995) 1639-1645 | 10.1103/PhysRevD.51.1639 | null | gr-qc | null | Spherically symmetric (1D) black-hole spacetimes are considered as a test for
numerical relativity. A finite difference code, based in the hyperbolic
structure of Einstein's equations with the harmonic slicing condition is
presented. Significant errors in the mass function are shown to arise from the
steep gradient z... | [
{
"created": "Thu, 22 Dec 1994 16:38:28 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Bona",
"Carles",
""
],
[
"Masso",
"Joan",
""
],
[
"Stela",
"Joan",
""
]
] | Spherically symmetric (1D) black-hole spacetimes are considered as a test for numerical relativity. A finite difference code, based in the hyperbolic structure of Einstein's equations with the harmonic slicing condition is presented. Significant errors in the mass function are shown to arise from the steep gradient zon... |
0708.1783 | Paul Davies | P. C. W. Davies | Constraints on the value of the fine structure constant from
gravitational thermodynamics | 6 pages, no figures, journal publication | Int.J.Theor.Phys.47:1949-1953,2008 | 10.1007/s10773-007-9638-1 | null | gr-qc | null | In this paper I show how the second law of thermodynamics, generalized to
include event horizon area, places interesting constraints on the value of the
fine structure constant. A simple analysis leads to the conclusion that
classical Dirac and point-like magnetic monopoles could be used to violate the
second law, an... | [
{
"created": "Mon, 13 Aug 2007 22:26:42 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Sep 2007 22:59:51 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Davies",
"P. C. W.",
""
]
] | In this paper I show how the second law of thermodynamics, generalized to include event horizon area, places interesting constraints on the value of the fine structure constant. A simple analysis leads to the conclusion that classical Dirac and point-like magnetic monopoles could be used to violate the second law, and ... |
gr-qc/0310029 | Yousuke Itoh | Yousuke Itoh | Equation of motion for relativistic compact binaries with the strong
field point particle limit: Third post-Newtonian order | 52 pages, no figure, Appendices B and D added. Phys. Rev. D in press | Phys.Rev. D69 (2004) 064018 | 10.1103/PhysRevD.69.064018 | null | gr-qc | null | An equation of motion for relativistic compact binaries is derived through
the third post-Newtonian (3 PN) approximation of general relativity. The strong
field point particle limit and multipole expansion of the stars are used to
solve iteratively the harmonically relaxed Einstein equations. We take into
account the... | [
{
"created": "Sun, 5 Oct 2003 18:06:47 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Feb 2004 13:38:58 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Itoh",
"Yousuke",
""
]
] | An equation of motion for relativistic compact binaries is derived through the third post-Newtonian (3 PN) approximation of general relativity. The strong field point particle limit and multipole expansion of the stars are used to solve iteratively the harmonically relaxed Einstein equations. We take into account the L... |
1908.11073 | Nelson Christensen | Nelson Christensen | Implications of the binary coalescence events found in O1 and O2 for the
stochastic background of gravitational events | Contribution to the 2019 Gravitation session of the 54th Rencontres
de Moriond | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Advanced LIGO and Advanced Virgo detectors have commenced observations.
Gravitational waves from the merger of binary black hole systems and a binary
neutron star system have been observed. A major goal for LIGO and Virgo is to
detect or set limits on a stochastic background of gravitational waves. A
stochastic b... | [
{
"created": "Thu, 29 Aug 2019 07:06:44 GMT",
"version": "v1"
}
] | 2019-08-30 | [
[
"Christensen",
"Nelson",
""
]
] | The Advanced LIGO and Advanced Virgo detectors have commenced observations. Gravitational waves from the merger of binary black hole systems and a binary neutron star system have been observed. A major goal for LIGO and Virgo is to detect or set limits on a stochastic background of gravitational waves. A stochastic bac... |
1706.03927 | Koray D\"uzta\c{s} | Koray D\"uzta\c{s} | Cosmic censorship and the third law of black hole dynamics | Final version to appear in Turkish Journal of Physics (Open access) | null | 10.3906/fiz-1802-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Israel's proof of the third law of black hole dynamics is based on the
semi-rigidity assumption which requires that the areas of the outermost trapped
surfaces are preserved. We argue that the condition that the area of the event
horizon should not decrease is necessary -but not sufficient- for the
semi-rigidity assu... | [
{
"created": "Tue, 13 Jun 2017 07:19:12 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Oct 2017 09:00:17 GMT",
"version": "v2"
},
{
"created": "Fri, 18 May 2018 22:00:18 GMT",
"version": "v3"
}
] | 2018-05-22 | [
[
"Düztaş",
"Koray",
""
]
] | Israel's proof of the third law of black hole dynamics is based on the semi-rigidity assumption which requires that the areas of the outermost trapped surfaces are preserved. We argue that the condition that the area of the event horizon should not decrease is necessary -but not sufficient- for the semi-rigidity assump... |
2305.04065 | Bobby Eka Gunara | Tegar Ari Widianto, Ahmad Khoirul Falah, Agus Suroso, Husin Alatas,
and Bobby Eka Gunara | Some Cosmological Consequences of Higher Dimensional
Klein-Gordon-Rastall Theory | 40 pages, 32 figures, typos corrected, abstract and all section
revised as referee suggestion. Accepted in European Phys Jour C | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Using dynamical system analysis, we investigate some cosmological
consequences of Rastall gravity coupled to a scalar field (called the
Klein-Gordon-Rastall theory) with exponential scalar potential turned on in
higher dimensions. From the critical points of the autonomous equations, we can
determine the dominant com... | [
{
"created": "Sat, 6 May 2023 15:00:44 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Oct 2023 13:42:51 GMT",
"version": "v2"
}
] | 2023-10-25 | [
[
"Widianto",
"Tegar Ari",
""
],
[
"Falah",
"Ahmad Khoirul",
""
],
[
"Suroso",
"Agus",
""
],
[
"Alatas",
"Husin",
""
],
[
"Gunara",
"Bobby Eka",
""
]
] | Using dynamical system analysis, we investigate some cosmological consequences of Rastall gravity coupled to a scalar field (called the Klein-Gordon-Rastall theory) with exponential scalar potential turned on in higher dimensions. From the critical points of the autonomous equations, we can determine the dominant compo... |
gr-qc/0412093 | Mauro Hueller | M. Hueller, M. Armano, L. Carbone, A. Cavalleri, R. Dolesi, C. D.
Hoyle, S. Vitale, W. J. Weber | Measuring the LISA test mass magnetic proprieties with a torsion
pendulum | 6 pages, 3 figures | Class.Quant.Grav. 22 (2005) S521-S526 | 10.1088/0264-9381/22/10/052 | null | gr-qc | null | Achieving the low frequency LISA sensitivity requires that the test masses
acting as the interferometer end mirrors are free-falling with an unprecedented
small degree of deviation. Magnetic disturbances, originating in the
interaction of the test mass with the environmental magnetic field, can
significantly deterior... | [
{
"created": "Sun, 19 Dec 2004 20:44:39 GMT",
"version": "v1"
},
{
"created": "Mon, 2 May 2005 12:38:08 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Hueller",
"M.",
""
],
[
"Armano",
"M.",
""
],
[
"Carbone",
"L.",
""
],
[
"Cavalleri",
"A.",
""
],
[
"Dolesi",
"R.",
""
],
[
"Hoyle",
"C. D.",
""
],
[
"Vitale",
"S.",
""
],
[
"Weber",
"W. J.",
... | Achieving the low frequency LISA sensitivity requires that the test masses acting as the interferometer end mirrors are free-falling with an unprecedented small degree of deviation. Magnetic disturbances, originating in the interaction of the test mass with the environmental magnetic field, can significantly deteriorat... |
gr-qc/0412024 | Pui Tang Leung | L. K. Tsui and P. T. Leung | Universality in Quasi-normal Modes of Neutron Stars | 16 pages, 9 figures | Mon.Not.Roy.Astron.Soc.357:1029-1037,2005 | 10.1111/j.1365-2966.2005.08710.x/abs/ | null | gr-qc | null | We study the universality in gravitational waves emitted from non-rotating
neutron stars characterized by different equations of state (EOS). We find that
the quasi-normal mode frequencies of such waves, including the $w$-modes and
the $f$-mode, display similar universal scaling behaviours that hold for most
EOS. Suc... | [
{
"created": "Mon, 6 Dec 2004 03:48:07 GMT",
"version": "v1"
}
] | 2011-05-23 | [
[
"Tsui",
"L. K.",
""
],
[
"Leung",
"P. T.",
""
]
] | We study the universality in gravitational waves emitted from non-rotating neutron stars characterized by different equations of state (EOS). We find that the quasi-normal mode frequencies of such waves, including the $w$-modes and the $f$-mode, display similar universal scaling behaviours that hold for most EOS. Such ... |
gr-qc/9808058 | Makoto Narita | Makoto Narita (Rikkyo University) | Rigid Singularity Theorem in Globally Hyperbolic Spacetimes | 3 pages, uses revtex.sty, to appear in Physical Review D | Phys.Rev. D58 (1998) 127501 | 10.1103/PhysRevD.58.127501 | null | gr-qc math-ph math.MP | null | We show the rigid singularity theorem, that is, a globally hyperbolic
spacetime satisfying the strong energy condition and containing past trapped
sets, either is timelike geodesically incomplete or splits isometrically as
space $\times$ time. This result is related to Yau's Lorentzian splitting
conjecture.
| [
{
"created": "Fri, 21 Aug 1998 12:30:04 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Narita",
"Makoto",
"",
"Rikkyo University"
]
] | We show the rigid singularity theorem, that is, a globally hyperbolic spacetime satisfying the strong energy condition and containing past trapped sets, either is timelike geodesically incomplete or splits isometrically as space $\times$ time. This result is related to Yau's Lorentzian splitting conjecture. |
1811.02458 | Israel Quiros | Israel Quiros, Roberto De Arcia | On local scale invariance and the questionable theoretical basis of the
conformal transformations' issue | 20 pag. no figures. Extended abstract, references added, new appendix
section added, minor changes to the text | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Here we follow the mainstream of thinking about physical equivalence of
different representations of a theory, regarded as the consequence of
invariance of the laws of physics -- represented by an action principle and the
derived motion equations -- under given transformations; be it coordinate,
gauge or conformal tr... | [
{
"created": "Tue, 6 Nov 2018 16:09:24 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Nov 2018 04:04:47 GMT",
"version": "v2"
}
] | 2018-11-14 | [
[
"Quiros",
"Israel",
""
],
[
"De Arcia",
"Roberto",
""
]
] | Here we follow the mainstream of thinking about physical equivalence of different representations of a theory, regarded as the consequence of invariance of the laws of physics -- represented by an action principle and the derived motion equations -- under given transformations; be it coordinate, gauge or conformal tran... |
0905.0955 | Vjacheslav Dorofeev | A. A. Grib | Spontaneous breaking of symmetry of the gravitons of the long wave
spectrum in the early Universe | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that nonlinear terms in equations of gravitons on the background
of curved space-time of the expanding Universe can solve the problem of the
negative square of the effective mass formally arising in linear approximation
for gravitons. Similar to well known spontaneous breaking of symmetry in
Goldstone mod... | [
{
"created": "Thu, 7 May 2009 06:22:38 GMT",
"version": "v1"
}
] | 2009-05-08 | [
[
"Grib",
"A. A.",
""
]
] | It is shown that nonlinear terms in equations of gravitons on the background of curved space-time of the expanding Universe can solve the problem of the negative square of the effective mass formally arising in linear approximation for gravitons. Similar to well known spontaneous breaking of symmetry in Goldstone model... |
gr-qc/0612140 | Carlos A. R. Herdeiro | L. Filipe Costa, Carlos A. R. Herdeiro | A gravito-electromagnetic analogy based on tidal tensors | 30 pages, LaTeX; v2. 38 pages, Major rewritting including: i) a new
realisation of the proposed analogy giving a simple derivation of the
Papapetrou equation for a spinning particle; ii) an appendix with a
derivation of the generalised worldline deviation equation; iii) a detailed
discussion of main results; iv... | Phys.Rev.D78:024021,2008 | 10.1103/PhysRevD.78.024021 | null | gr-qc hep-th | null | We propose a new approach to a physical analogy between General Relativity
and Electromagnetism, based on tidal tensors of both theories. Using this
approach we write a covariant form for the gravitational analogues of the
Maxwell equations. The following realisations of the analogy are given. The
first one matches l... | [
{
"created": "Thu, 21 Dec 2006 20:28:54 GMT",
"version": "v1"
},
{
"created": "Mon, 21 May 2007 17:42:18 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Costa",
"L. Filipe",
""
],
[
"Herdeiro",
"Carlos A. R.",
""
]
] | We propose a new approach to a physical analogy between General Relativity and Electromagnetism, based on tidal tensors of both theories. Using this approach we write a covariant form for the gravitational analogues of the Maxwell equations. The following realisations of the analogy are given. The first one matches lin... |
2312.17129 | Sujoy Modak | Dhamar S. Astilla, Sujoy K. Modak and Enrique Salazar | Anisotropic particle creation from $T-$vacuum in the radiation dominated
universe | 16 pages, revtex two column, 3 figures | null | null | null | gr-qc astro-ph.CO hep-th quant-ph | http://creativecommons.org/licenses/by/4.0/ | We further investigate novel features of the $T-$vacuum state, originally
defined in the context of quantum field theory in a (1+1) dimensional radiation
dominated universe [Modak, JHEP 12, 031 (2020)]. Here we extend the previous
work to a realistic (3+1) dimensional set up and show that $T-$vacuum causes an
\emph{a... | [
{
"created": "Thu, 28 Dec 2023 17:05:56 GMT",
"version": "v1"
}
] | 2023-12-29 | [
[
"Astilla",
"Dhamar S.",
""
],
[
"Modak",
"Sujoy K.",
""
],
[
"Salazar",
"Enrique",
""
]
] | We further investigate novel features of the $T-$vacuum state, originally defined in the context of quantum field theory in a (1+1) dimensional radiation dominated universe [Modak, JHEP 12, 031 (2020)]. Here we extend the previous work to a realistic (3+1) dimensional set up and show that $T-$vacuum causes an \emph{ani... |
1706.00507 | Vasilis Oikonomou | V.K. Oikonomou | Reheating in Constant-roll $F(R)$ Gravity | null | Mod. Phys. Lett. A32 (2017) 1750172 | 10.1142/S0217732317501723 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we address the reheating issue in the context of $F(R)$ gravity,
for theories that the inflationary era does not obey the slow-roll condition
but the constant-roll condition is assumed. As it is known, the reheating era
takes place after the end of the inflationary era, so we investigate the
implications... | [
{
"created": "Thu, 1 Jun 2017 22:05:41 GMT",
"version": "v1"
}
] | 2017-10-10 | [
[
"Oikonomou",
"V. K.",
""
]
] | In this work we address the reheating issue in the context of $F(R)$ gravity, for theories that the inflationary era does not obey the slow-roll condition but the constant-roll condition is assumed. As it is known, the reheating era takes place after the end of the inflationary era, so we investigate the implications o... |
1611.00208 | Bethan Cropp | Bethan Cropp | Strange Horizons: Understanding Causal Barriers Beyond General
Relativity | PhD Thesis, with minor corrections, submitted to SISSA in 2015, 152
pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This thesis explores two avenues into understanding the physics of black
holes and horizons beyond general relativity, via analogue models and Lorentz
violating theories. Analogue spacetimes have wildly different dynamics to
general relativity; this allows the possibility of non-Killing horizons in
stationary solutio... | [
{
"created": "Tue, 1 Nov 2016 13:02:24 GMT",
"version": "v1"
}
] | 2016-11-02 | [
[
"Cropp",
"Bethan",
""
]
] | This thesis explores two avenues into understanding the physics of black holes and horizons beyond general relativity, via analogue models and Lorentz violating theories. Analogue spacetimes have wildly different dynamics to general relativity; this allows the possibility of non-Killing horizons in stationary solutions... |
0806.0628 | Eric Greenwood | Eric Greenwood and Dejan Stojkovic | Hawking radiation as seen by an infalling observer | Added analysis of the Hawking-like radiation as seen by an observer
in Eddington-Finkelstein coordinates. Accepted for publication in JHEP | JHEP 0909:058,2009 | 10.1088/1126-6708/2009/09/058 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate an important question of Hawking-like radiation as seen by an
infalling observer during gravitational collapse. Using the functional
Schrodinger formalism we are able to probe the time dependent regime which is
out of the reach of the standard approximations like the Bogolyubov method. We
calculate the... | [
{
"created": "Tue, 3 Jun 2008 20:03:19 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Sep 2009 21:18:07 GMT",
"version": "v2"
}
] | 2014-11-18 | [
[
"Greenwood",
"Eric",
""
],
[
"Stojkovic",
"Dejan",
""
]
] | We investigate an important question of Hawking-like radiation as seen by an infalling observer during gravitational collapse. Using the functional Schrodinger formalism we are able to probe the time dependent regime which is out of the reach of the standard approximations like the Bogolyubov method. We calculate the o... |
1207.6024 | Surajit Chattopadhyay | Rahul Ghosh (Bhairab Ganguly College), Antonio Pasqua (University of
Trieste) and Surajit Chattopadhyay (Pailan College of Management and
Technology) | Generalized second law of thermodynamics in the emergent universe for
some viable models of f(T) gravity | 12 pages, 17 figures. arXiv admin note: text overlap with
arXiv:1201.2511 by other authors | Eur. Phys. J. Plus (2013) 128: 12 | 10.1140/epjp/i2013-13012-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present study is motivated by the study of reference [1], where the
generalized second law of thermodynamics has been investigated for a flat FRW
universe for two viable models of $f(T)$ gravity. In the present work, we have
considered a non-flat universe and accordingly studied the behaviors of
equation of state... | [
{
"created": "Tue, 24 Jul 2012 11:34:22 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Nov 2012 15:57:46 GMT",
"version": "v2"
}
] | 2013-11-22 | [
[
"Ghosh",
"Rahul",
"",
"Bhairab Ganguly College"
],
[
"Pasqua",
"Antonio",
"",
"University of\n Trieste"
],
[
"Chattopadhyay",
"Surajit",
"",
"Pailan College of Management and\n Technology"
]
] | The present study is motivated by the study of reference [1], where the generalized second law of thermodynamics has been investigated for a flat FRW universe for two viable models of $f(T)$ gravity. In the present work, we have considered a non-flat universe and accordingly studied the behaviors of equation of state p... |
2202.12415 | Justo Hernan Ospino Zu\~niga | J. Ospino, J.L. Hernandez-Pastora, L.A. Nunez | All analytic solutions for geodesic motion in axially symmetric
space-times | null | null | 10.1140/epjc/s10052-022-10544-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent observations of the orbits of star clusters around Sgr $A^\star$,
imaging of black holes and gravitational waveforms of merging compact objects
require a detailed understanding of the general relativistic geodesic motion.
We came up with a method to provide all the possible geodesics in an axially
symmetric sp... | [
{
"created": "Thu, 24 Feb 2022 23:14:07 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Mar 2022 21:04:09 GMT",
"version": "v2"
}
] | 2022-07-13 | [
[
"Ospino",
"J.",
""
],
[
"Hernandez-Pastora",
"J. L.",
""
],
[
"Nunez",
"L. A.",
""
]
] | Recent observations of the orbits of star clusters around Sgr $A^\star$, imaging of black holes and gravitational waveforms of merging compact objects require a detailed understanding of the general relativistic geodesic motion. We came up with a method to provide all the possible geodesics in an axially symmetric spac... |
1505.00214 | Paul Tod | Ron Kelly and Paul Tod | Penrose's quasi-local mass for asymptotically anti-de Sitter space-times | 7 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Penrose's quasi-local mass construction is carried through for two-surfaces
at infinity in asymptotically anti-de Sitter space-times. A modification of the
Witten argument is given to prove a positivity property of the resulting
conserved quantities.
[This work formed part of Ron Kelly's Oxford D.Phil. thesis, and ... | [
{
"created": "Fri, 1 May 2015 16:33:25 GMT",
"version": "v1"
}
] | 2015-05-04 | [
[
"Kelly",
"Ron",
""
],
[
"Tod",
"Paul",
""
]
] | Penrose's quasi-local mass construction is carried through for two-surfaces at infinity in asymptotically anti-de Sitter space-times. A modification of the Witten argument is given to prove a positivity property of the resulting conserved quantities. [This work formed part of Ron Kelly's Oxford D.Phil. thesis, and the ... |
1903.06376 | Akash Kumar Mishra | Akash K Mishra, Sumanta Chakraborty, Sudipta Sarkar | Understanding photon sphere and black hole shadow in dynamically
evolving spacetimes | 39 pages, Accepted in PRD | Phys. Rev. D 99, 104080 (2019) | 10.1103/PhysRevD.99.104080 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have derived the differential equation governing the evolution of the
photon sphere for dynamical black hole spacetimes with or without spherical
symmetry. Numerical solution of the same depicting evolution of the photon
sphere has been presented for Vaidya, Reissner-Nordstr\"{o}m-Vaidya and
de-Sitter Vaidya space... | [
{
"created": "Fri, 15 Mar 2019 06:02:40 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Jun 2019 04:56:49 GMT",
"version": "v2"
}
] | 2019-06-05 | [
[
"Mishra",
"Akash K",
""
],
[
"Chakraborty",
"Sumanta",
""
],
[
"Sarkar",
"Sudipta",
""
]
] | We have derived the differential equation governing the evolution of the photon sphere for dynamical black hole spacetimes with or without spherical symmetry. Numerical solution of the same depicting evolution of the photon sphere has been presented for Vaidya, Reissner-Nordstr\"{o}m-Vaidya and de-Sitter Vaidya spaceti... |
gr-qc/9811016 | Fernando C. Lombardo | Mario Castagnino, Susana Landau, and Fernando C. Lombardo | Creation of unstable particles and decoherence in semiclassical
cosmology | latex file; 18 pages. Some changes have been added. To appear in Gen.
Rel. and Grav | Gen.Rel.Grav. 31 (1999) 1407-1422 | 10.1023/A:1026793212170 | null | gr-qc | null | We consider a simple cosmological model in order to show the importance of
unstable particle creation for the validity of the semiclassical approximation.
Using the mathematical structure of rigged Hilbert spaces we show that particle
creation is the seed of decoherence which enables the quantum to classical
transiti... | [
{
"created": "Wed, 4 Nov 1998 17:13:32 GMT",
"version": "v1"
},
{
"created": "Wed, 26 May 1999 13:48:15 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Castagnino",
"Mario",
""
],
[
"Landau",
"Susana",
""
],
[
"Lombardo",
"Fernando C.",
""
]
] | We consider a simple cosmological model in order to show the importance of unstable particle creation for the validity of the semiclassical approximation. Using the mathematical structure of rigged Hilbert spaces we show that particle creation is the seed of decoherence which enables the quantum to classical transition... |
1504.02455 | Emanuele Berti | Kostas Glampedakis, George Pappas, Hector O. Silva, Emanuele Berti | Post-Tolman-Oppenheimer-Volkoff formalism for relativistic stars | 25 pages, 11 figures, 1 table. Minor changes to match version
published in PRD | Phys. Rev. D 92, 024056 (2015) | 10.1103/PhysRevD.92.024056 | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Besides their astrophysical interest, compact stars also provide an arena for
understanding the properties of theories of gravity that differ from Einstein's
general relativity. Numerous studies have shown that different modified
theories of gravity can modify the bulk properties (such as mass and radius) of
neutron ... | [
{
"created": "Thu, 9 Apr 2015 19:46:41 GMT",
"version": "v1"
},
{
"created": "Sat, 1 Aug 2015 00:10:39 GMT",
"version": "v2"
}
] | 2015-08-05 | [
[
"Glampedakis",
"Kostas",
""
],
[
"Pappas",
"George",
""
],
[
"Silva",
"Hector O.",
""
],
[
"Berti",
"Emanuele",
""
]
] | Besides their astrophysical interest, compact stars also provide an arena for understanding the properties of theories of gravity that differ from Einstein's general relativity. Numerous studies have shown that different modified theories of gravity can modify the bulk properties (such as mass and radius) of neutron st... |
gr-qc/9808045 | Clive Wells | Clive G. Wells | Extending the Black Hole Uniqueness Theorems, II. Superstring Black
Holes | 18 pages, LaTeX (REVTeX) | null | null | DAMTP-1998-106 | gr-qc hep-th | null | We make use of an internal symmetry of a truncation of the bosonic sector of
the superstring and N=4 supergravity theories to write down an analogue of
Robinson's identity for the black holes of this theory. This allows us to prove
the uniqueness of a restricted class of black hole solutions. In particular, we
can ap... | [
{
"created": "Mon, 17 Aug 1998 00:01:39 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Wells",
"Clive G.",
""
]
] | We make use of an internal symmetry of a truncation of the bosonic sector of the superstring and N=4 supergravity theories to write down an analogue of Robinson's identity for the black holes of this theory. This allows us to prove the uniqueness of a restricted class of black hole solutions. In particular, we can appl... |
0710.5671 | Jorma Louko | Jorma Louko, Alejandro Satz | Transition rate of the Unruh-DeWitt detector in curved spacetime | 27 pages, 1 figure. v3: Typos corrected. Published version | Class.Quant.Grav.25:055012, 2008 | 10.1088/0264-9381/25/5/055012 | null | gr-qc | null | We examine the Unruh-DeWitt particle detector coupled to a scalar field in an
arbitrary Hadamard state in four-dimensional curved spacetime. Using smooth
switching functions to turn on and off the interaction, we obtain a
regulator-free integral formula for the total excitation probability, and we
show that an instan... | [
{
"created": "Tue, 30 Oct 2007 15:11:53 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Nov 2007 17:17:47 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Feb 2008 12:13:12 GMT",
"version": "v3"
}
] | 2014-11-18 | [
[
"Louko",
"Jorma",
""
],
[
"Satz",
"Alejandro",
""
]
] | We examine the Unruh-DeWitt particle detector coupled to a scalar field in an arbitrary Hadamard state in four-dimensional curved spacetime. Using smooth switching functions to turn on and off the interaction, we obtain a regulator-free integral formula for the total excitation probability, and we show that an instanta... |
1808.05834 | Ulrich Sperhake | William G. Cook, Diandian Wang, Ulrich Sperhake | Orbiting black-hole binaries and apparent horizons in higher dimensions | 24 pages, 3 Figures, 3 Tables; to match version published in CQG | null | 10.1088/1361-6382/aae995 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study gravitational wave emission and the structure and formation of
apparent horizons in orbiting black-hole binary systems in higher-dimensional
general relativity. For this purpose we present an apparent horizon finder for
use in higher dimensional numerical simulations and test the finder's accuracy
and consis... | [
{
"created": "Fri, 17 Aug 2018 12:03:20 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Nov 2018 18:40:43 GMT",
"version": "v2"
}
] | 2018-11-19 | [
[
"Cook",
"William G.",
""
],
[
"Wang",
"Diandian",
""
],
[
"Sperhake",
"Ulrich",
""
]
] | We study gravitational wave emission and the structure and formation of apparent horizons in orbiting black-hole binary systems in higher-dimensional general relativity. For this purpose we present an apparent horizon finder for use in higher dimensional numerical simulations and test the finder's accuracy and consiste... |
1906.08789 | Maria Okounkova | Maria Okounkova, Leo C. Stein, Mark A. Scheel, Saul A. Teukolsky | Numerical binary black hole collisions in dynamical Chern-Simons gravity | 13 pages (+ appendices), 15 figures | Phys. Rev. D 100, 104026 (2019) | 10.1103/PhysRevD.100.104026 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We produce the first numerical relativity binary black hole gravitational
waveforms in a higher-curvature theory beyond general relativity. In
particular, we study head-on collisions of binary black holes in order-reduced
dynamical Chern-Simons gravity. This is a precursor to producing
beyond-general-relativity wavef... | [
{
"created": "Thu, 20 Jun 2019 18:00:22 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Nov 2019 14:34:14 GMT",
"version": "v2"
}
] | 2019-11-20 | [
[
"Okounkova",
"Maria",
""
],
[
"Stein",
"Leo C.",
""
],
[
"Scheel",
"Mark A.",
""
],
[
"Teukolsky",
"Saul A.",
""
]
] | We produce the first numerical relativity binary black hole gravitational waveforms in a higher-curvature theory beyond general relativity. In particular, we study head-on collisions of binary black holes in order-reduced dynamical Chern-Simons gravity. This is a precursor to producing beyond-general-relativity wavefor... |
1106.2413 | Muhammad Sharif | M. Sharif and Farida Khanum | Kaluza-Klein Cosmology With Modified Holographic Dark Energy | 13 pages, accepted for publication in Gen. Relativ. Gravit | Gen. Relativ. Gravit. 43(2011)2885-2894 | 10.1007/s10714-011-1211-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the compact Kaluza-Klein cosmology in which modified
holographic dark energy is interacting with dark matter. Using this scenario,
we evaluate equation of state parameter as well as equation of evolution of the
modified holographic dark energy. Further, it is shown that the generalized
second law of th... | [
{
"created": "Mon, 13 Jun 2011 10:51:52 GMT",
"version": "v1"
}
] | 2015-05-28 | [
[
"Sharif",
"M.",
""
],
[
"Khanum",
"Farida",
""
]
] | We investigate the compact Kaluza-Klein cosmology in which modified holographic dark energy is interacting with dark matter. Using this scenario, we evaluate equation of state parameter as well as equation of evolution of the modified holographic dark energy. Further, it is shown that the generalized second law of ther... |
2309.11168 | Saulo Soares De Albuquerque Filho | Saulo Albuquerque, Sebastian H. V\"olkel, Kostas D. Kokkotas, and
Valdir B. Bezerra | Inverse problem of analog gravity systems | 11 pages, 7 figures | Phys. Rev. D 108, 124053 (2023) | 10.1103/PhysRevD.108.124053 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Analog gravity models of black holes and exotic compact objects provide a
unique opportunity to study key properties of such systems in controlled
laboratory environments. In contrast to astrophysical systems, analog gravity
systems can be prepared carefully and their dynamical aspects thus investigated
in unpreceden... | [
{
"created": "Wed, 20 Sep 2023 09:26:28 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Feb 2024 15:38:42 GMT",
"version": "v2"
}
] | 2024-02-12 | [
[
"Albuquerque",
"Saulo",
""
],
[
"Völkel",
"Sebastian H.",
""
],
[
"Kokkotas",
"Kostas D.",
""
],
[
"Bezerra",
"Valdir B.",
""
]
] | Analog gravity models of black holes and exotic compact objects provide a unique opportunity to study key properties of such systems in controlled laboratory environments. In contrast to astrophysical systems, analog gravity systems can be prepared carefully and their dynamical aspects thus investigated in unprecedente... |
1308.5035 | Chikun Ding | Chikun Ding, Changqing Liu, Yuanyuan Xiao, Liqun Jiang and Rong-Gen
Cai | Strong gravitational lensing in a black-hole spacetime dominated by dark
energy | 11 pages, 5 figures, 3 tables, accepted by Phys. Rev. D. arXiv admin
note: substantial text overlap with arXiv:1012.1670, arXiv:1106.1974; and
text overlap with arXiv:1003.1429, arXiv:1102.0086 by other authors | Phys. Rev. D 88 104007 (2013) | 10.1103/PhysRevD.88.104007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the influence of phantom fields on strong field gravitational
lensing. Supposing that the gravitational field of the supermassive central
object of the Galaxy is described by a phantom black hole metric, we estimate
the numerical values of the coefficients and observations and find that the
influence of the ... | [
{
"created": "Fri, 23 Aug 2013 03:26:25 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Oct 2013 01:56:41 GMT",
"version": "v2"
}
] | 2013-11-14 | [
[
"Ding",
"Chikun",
""
],
[
"Liu",
"Changqing",
""
],
[
"Xiao",
"Yuanyuan",
""
],
[
"Jiang",
"Liqun",
""
],
[
"Cai",
"Rong-Gen",
""
]
] | We study the influence of phantom fields on strong field gravitational lensing. Supposing that the gravitational field of the supermassive central object of the Galaxy is described by a phantom black hole metric, we estimate the numerical values of the coefficients and observations and find that the influence of the ph... |
2012.06162 | De-Cheng Zou | Chao-Ming Zhang, De-Cheng Zou, Ming Zhang | Triple points and phase diagrams of Born-Infeld AdS black holes in 4D
Einstein-Gauss-Bonnet gravity | null | Phys.Lett.B 811 (2020), 135955 | 10.1016/j.physletb.2020.135955 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By treating the cosmological constant as a thermodynamic pressure, we
investigate the thermodynamic behaviors of Born-Infeld AdS black hole in 4D
Einstein-Gauss-Bonnet (EGB) gravity. The result shows that the Van der Waals
like small/large black hole (SBH/LBH) phase transition always appears for any
positive paramete... | [
{
"created": "Fri, 11 Dec 2020 06:43:39 GMT",
"version": "v1"
}
] | 2020-12-14 | [
[
"Zhang",
"Chao-Ming",
""
],
[
"Zou",
"De-Cheng",
""
],
[
"Zhang",
"Ming",
""
]
] | By treating the cosmological constant as a thermodynamic pressure, we investigate the thermodynamic behaviors of Born-Infeld AdS black hole in 4D Einstein-Gauss-Bonnet (EGB) gravity. The result shows that the Van der Waals like small/large black hole (SBH/LBH) phase transition always appears for any positive parameters... |
2201.06296 | Sven Zschocke | Sven Zschocke | Light propagation in 2PN approximation in the monopole and quadrupole
field of a body at rest: Initial value problem | 55 pages, 1 figure, 4 tables | Physical Review D 105 (2022) 024040 | 10.1103/PhysRevD.105.024040 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The light trajectory in the gravitational field of one body at rest with
monopole and quadrupole structure is determined in the second post-Newtonian
(2PN) approximation. The terms in the geodesic equation for light rays are
separated into time-independent tensorial coefficients and four kind of
time-dependent scalar... | [
{
"created": "Mon, 17 Jan 2022 09:27:30 GMT",
"version": "v1"
}
] | 2022-01-26 | [
[
"Zschocke",
"Sven",
""
]
] | The light trajectory in the gravitational field of one body at rest with monopole and quadrupole structure is determined in the second post-Newtonian (2PN) approximation. The terms in the geodesic equation for light rays are separated into time-independent tensorial coefficients and four kind of time-dependent scalar f... |
2109.01149 | Antoine Leh\'ebel | Christos Charmousis, Antoine Leh\'ebel, Evangelos Smyrniotis, Nikolaos
Stergioulas | Astrophysical constraints on compact objects in 4D Einstein-Gauss-Bonnet
gravity | Virgo preprint number VIR-0918C-21, 30 pages, 9 figures; v2 contains
some corrections to the mass-radius relations, showing in particular that all
equations of state converge at high densities | null | 10.1088/1475-7516/2022/02/033 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the properties of compact objects in a particular 4D Horndeski
theory originating from higher dimensional Einstein-Gauss-Bonnet gravity.
Remarkably, an exact vacuum solution is known. This compact object differs from
general relativity mostly in the strong field regime. We discuss some
properties of black ho... | [
{
"created": "Thu, 2 Sep 2021 18:00:03 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Feb 2022 15:01:53 GMT",
"version": "v2"
}
] | 2022-03-02 | [
[
"Charmousis",
"Christos",
""
],
[
"Lehébel",
"Antoine",
""
],
[
"Smyrniotis",
"Evangelos",
""
],
[
"Stergioulas",
"Nikolaos",
""
]
] | We study the properties of compact objects in a particular 4D Horndeski theory originating from higher dimensional Einstein-Gauss-Bonnet gravity. Remarkably, an exact vacuum solution is known. This compact object differs from general relativity mostly in the strong field regime. We discuss some properties of black hole... |
gr-qc/0304028 | Dmitri Vassiliev | Dmitri Vassiliev | Quadratic metric-affine gravity | 25 pages, LaTeX2e | Annalen Phys. 14 (2005) 231-252 | 10.1002/andp.200410118 | null | gr-qc math.DG | null | We consider spacetime to be a connected real 4-manifold equipped with a
Lorentzian metric and an affine connection. The 10 independent components of
the (symmetric) metric tensor and the 64 connection coefficients are the
unknowns of our theory. We introduce an action which is quadratic in curvature
and study the res... | [
{
"created": "Sun, 6 Apr 2003 23:22:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Vassiliev",
"Dmitri",
""
]
] | We consider spacetime to be a connected real 4-manifold equipped with a Lorentzian metric and an affine connection. The 10 independent components of the (symmetric) metric tensor and the 64 connection coefficients are the unknowns of our theory. We introduce an action which is quadratic in curvature and study the resul... |
gr-qc/0404054 | Olaf Dreyer | Olaf Dreyer | Relational Physics and Quantum Space | Essay submitted to the 2004 Gravity Research Foundation competition | null | null | null | gr-qc | null | In a purely relational theory there exists a tension between the relational
character of the theory and the existence of quantities like distance and
duration. We review this issue in the context of the Leibniz-Clarke
correspondence. We then address this conflict by showing that a purely
relational definition of leng... | [
{
"created": "Tue, 13 Apr 2004 01:18:22 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dreyer",
"Olaf",
""
]
] | In a purely relational theory there exists a tension between the relational character of the theory and the existence of quantities like distance and duration. We review this issue in the context of the Leibniz-Clarke correspondence. We then address this conflict by showing that a purely relational definition of length... |
0908.3766 | John T. Whelan | John T. Whelan, Reinhard Prix, and Deepak Khurana | Searching for Galactic White Dwarf Binaries in Mock LISA Data using an
F-Statistic Template Bank | 29 pages, 11 figures; submitted to Classical and Quantum Gravity | Class.Quant.Grav.27:055010,2010 | 10.1088/0264-9381/27/5/055010 | LIGO-P080087-v5 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe an F-statistic search for continuous gravitational waves from
galactic white-dwarf binaries in simulated LISA Data. Our search method employs
a hierarchical template-grid based exploration of the parameter space. In the
first stage, candidate sources are identified in searches using different
simulated la... | [
{
"created": "Wed, 26 Aug 2009 16:19:10 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Oct 2009 18:39:31 GMT",
"version": "v2"
},
{
"created": "Thu, 7 Jan 2010 22:21:04 GMT",
"version": "v3"
}
] | 2010-02-19 | [
[
"Whelan",
"John T.",
""
],
[
"Prix",
"Reinhard",
""
],
[
"Khurana",
"Deepak",
""
]
] | We describe an F-statistic search for continuous gravitational waves from galactic white-dwarf binaries in simulated LISA Data. Our search method employs a hierarchical template-grid based exploration of the parameter space. In the first stage, candidate sources are identified in searches using different simulated lase... |
gr-qc/0409053 | Yuan-Zhong Zhang | Kamal K. Nandi, Yuan-Zhong Zhang, and Nail G. Migranov | A Semiclassical ANEC Constraint On Classical Traversable Lorentzian
Wormholes | 9 pages, no figures | J. Nonlinear Phenomena in Complex Systems 9(2006)61-67 | null | null | gr-qc | null | The present article lies at the interface between gravity, a highly nonlinear
phenomenon, and quantum field theory. The nonlinear field equations of Einstein
permit the theoretical existence of classical wormholes. One of the fundamental
questions relates to the practical viability of such wormholes. One way to
answe... | [
{
"created": "Mon, 13 Sep 2004 08:59:36 GMT",
"version": "v1"
},
{
"created": "Sun, 29 May 2005 01:08:32 GMT",
"version": "v2"
},
{
"created": "Tue, 13 Jun 2006 04:02:15 GMT",
"version": "v3"
},
{
"created": "Fri, 16 Jun 2006 01:13:04 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"Nandi",
"Kamal K.",
""
],
[
"Zhang",
"Yuan-Zhong",
""
],
[
"Migranov",
"Nail G.",
""
]
] | The present article lies at the interface between gravity, a highly nonlinear phenomenon, and quantum field theory. The nonlinear field equations of Einstein permit the theoretical existence of classical wormholes. One of the fundamental questions relates to the practical viability of such wormholes. One way to answer ... |
1210.0186 | Emil M. Prodanov | Rossen I. Ivanov and Emil M. Prodanov | Cyclic Universe with an Inflationary Phase from a Cosmological Model
with Real Gas Quintessence | 21 pages, 8 figures, to appear in Physical Review D | Physical Review D 86, 083536 (2012) | 10.1103/PhysRevD.86.083536 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Phase-plane stability analysis of a dynamical system describing the Universe
as a two-fraction fluid containing baryonic dust and real virial gas
quintessence is presented. Existence of a stable periodic solution experiencing
inflationary periods is shown. A van der Waals quintessence model is revisited
and cyclic Un... | [
{
"created": "Sun, 30 Sep 2012 11:05:24 GMT",
"version": "v1"
}
] | 2022-09-15 | [
[
"Ivanov",
"Rossen I.",
""
],
[
"Prodanov",
"Emil M.",
""
]
] | Phase-plane stability analysis of a dynamical system describing the Universe as a two-fraction fluid containing baryonic dust and real virial gas quintessence is presented. Existence of a stable periodic solution experiencing inflationary periods is shown. A van der Waals quintessence model is revisited and cyclic Univ... |
2007.05644 | Benaoumeur Bakhti | Benaoumeur Bakhti | D-dimensional self-gravitating lattice gas in general relativity | null | null | 10.1142/S0217751X21502171 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using a lattice equation of state combined with the D-dimensional
Tolman-Oppenheimer-Volkoff equation and the Friedmann equations, we investigate
the possibility of the formation of compact objects as well as the time
evolution of the scale factor and the density profile of a self-gravitating
material cluster. The nu... | [
{
"created": "Fri, 10 Jul 2020 23:21:03 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Oct 2021 17:43:53 GMT",
"version": "v2"
}
] | 2021-12-01 | [
[
"Bakhti",
"Benaoumeur",
""
]
] | Using a lattice equation of state combined with the D-dimensional Tolman-Oppenheimer-Volkoff equation and the Friedmann equations, we investigate the possibility of the formation of compact objects as well as the time evolution of the scale factor and the density profile of a self-gravitating material cluster. The nume... |
gr-qc/9510045 | Robin W. Tucker | Pierre Teyssandier and Robin W Tucker | Gravity, Gauges and Clocks | 8 pages Plain Tex (No Figures), Classical and Quantum Gravity | Class.Quant.Grav. 13 (1996) 145-152 | 10.1088/0264-9381/13/1/013 | null | gr-qc | null | We discuss the definitions of standard clocks in theories of gravitation.
These definitions are motivated by the invariance of actions under different
gauge symmetries. We contrast the definition of a standard Weyl clock with that
of a clock in general relativity and argue that the historical criticisms of
theories b... | [
{
"created": "Mon, 23 Oct 1995 16:04:52 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Teyssandier",
"Pierre",
""
],
[
"Tucker",
"Robin W",
""
]
] | We discuss the definitions of standard clocks in theories of gravitation. These definitions are motivated by the invariance of actions under different gauge symmetries. We contrast the definition of a standard Weyl clock with that of a clock in general relativity and argue that the historical criticisms of theories bas... |
1902.09199 | Enrico Barausse | Enrico Barausse | Black holes in General Relativity and beyond | 9 pages, 1 figure. Published in the proceedings of the conference
'Recent Progress in Relativistic Astrophysics', Shanghai, China, 6-8 May 2019 | null | 10.3390/proceedings2019017001 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent detections of gravitational waves from binary systems of black
holes are in remarkable agreement with the predictions of General Relativity.
In this pedagogical mini-review, I will go through the physics of the different
phases of the evolution of black hole binary systems, providing a qualitative
physical... | [
{
"created": "Mon, 25 Feb 2019 11:25:32 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jun 2019 10:08:06 GMT",
"version": "v2"
}
] | 2021-11-24 | [
[
"Barausse",
"Enrico",
""
]
] | The recent detections of gravitational waves from binary systems of black holes are in remarkable agreement with the predictions of General Relativity. In this pedagogical mini-review, I will go through the physics of the different phases of the evolution of black hole binary systems, providing a qualitative physical i... |
gr-qc/0207117 | G. S. Asanov | G.S. Asanov | Finslerian Post-Lorentzian Kinematic Transformations in
Anisotropic-Space Case | null | null | null | null | gr-qc | null | The Finslerian post-Lorentzian kinematic transformations can explicitly be
obtained under uni-directional breakdown of spatial isotropy, provided that the
requirement that the relativistic unit hypersurface (indicatrix or mass shell)
be a space of constant negative curvature is still fulfilled. The method
consists in... | [
{
"created": "Tue, 30 Jul 2002 03:58:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Asanov",
"G. S.",
""
]
] | The Finslerian post-Lorentzian kinematic transformations can explicitly be obtained under uni-directional breakdown of spatial isotropy, provided that the requirement that the relativistic unit hypersurface (indicatrix or mass shell) be a space of constant negative curvature is still fulfilled. The method consists in e... |
gr-qc/0409119 | Tatyana P. Shestakova | T. P. Shestakova and C. Simeone | The problem of time and gauge invariance in the quantization of
cosmological models. II. Recent developments in the path integral approach | 13 pages, to be published in Grav. Cosmol. For the first part of the
paper, see gr-qc/0409114 | Grav.Cosmol. 10 (2004) 257-268 | null | null | gr-qc | null | The paper is the second part of the work devoted to the problem of time in
quantum cosmology. Here we consider in detail two approaches within the scope
of Feynman path integration scheme: The first, by Simeone and collaborators, is
gauge-invariant and lies within the unitary approach to a consistent
quantization of ... | [
{
"created": "Thu, 30 Sep 2004 09:15:56 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Shestakova",
"T. P.",
""
],
[
"Simeone",
"C.",
""
]
] | The paper is the second part of the work devoted to the problem of time in quantum cosmology. Here we consider in detail two approaches within the scope of Feynman path integration scheme: The first, by Simeone and collaborators, is gauge-invariant and lies within the unitary approach to a consistent quantization of gr... |
gr-qc/0301105 | Miguel Alcubierre | Miguel Alcubierre, Ricardo Becerril, F. Siddhartha Guzman, Tonatiuh
Matos, Dario Nunez, L. Arturo Urena-Lopez | Numerical studies of Phi^2-Oscillatons | null | Class.Quant.Grav. 20 (2003) 2883-2904 | 10.1088/0264-9381/20/13/332 | null | gr-qc | null | We present an exhaustive analysis of the numerical evolution of the
Einstein-Klein-Gordon equations for the case of a real scalar field endowed
with a quadratic self-interaction potential. The self-gravitating equilibrium
configurations are called oscillatons and are close relatives of boson stars,
their complex coun... | [
{
"created": "Fri, 24 Jan 2003 21:00:15 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Alcubierre",
"Miguel",
""
],
[
"Becerril",
"Ricardo",
""
],
[
"Guzman",
"F. Siddhartha",
""
],
[
"Matos",
"Tonatiuh",
""
],
[
"Nunez",
"Dario",
""
],
[
"Urena-Lopez",
"L. Arturo",
""
]
] | We present an exhaustive analysis of the numerical evolution of the Einstein-Klein-Gordon equations for the case of a real scalar field endowed with a quadratic self-interaction potential. The self-gravitating equilibrium configurations are called oscillatons and are close relatives of boson stars, their complex counte... |
1905.00409 | Matthew Mewes | Matthew Mewes | Signals for Lorentz violation in gravitational waves | 14 pages | Phys. Rev. D 99, 104062 (2019) | 10.1103/PhysRevD.99.104062 | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Lorentz violations in gravitational waves are investigated. Plane-wave
solutions for arbitrary gauge-invariant violations in linearized gravity are
constructed. Signatures of Lorentz violation include dispersion, birefringence,
and anisotropies. Modifications to waves from coalescing compact binaries and
to strain si... | [
{
"created": "Wed, 1 May 2019 17:49:52 GMT",
"version": "v1"
}
] | 2019-06-05 | [
[
"Mewes",
"Matthew",
""
]
] | Lorentz violations in gravitational waves are investigated. Plane-wave solutions for arbitrary gauge-invariant violations in linearized gravity are constructed. Signatures of Lorentz violation include dispersion, birefringence, and anisotropies. Modifications to waves from coalescing compact binaries and to strain sign... |
1709.02007 | Ian Hinder | Ian Hinder, Lawrence E. Kidder, Harald P. Pfeiffer | An eccentric binary black hole inspiral-merger-ringdown gravitational
waveform model from numerical relativity and post-Newtonian theory | null | Phys. Rev. D 98, 044015 (2018) | 10.1103/PhysRevD.98.044015 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a prescription for computing gravitational waveforms for the
inspiral, merger and ringdown of non-spinning eccentric binary black hole
systems. The inspiral waveform is computed using the post-Newtonian expansion
and the merger waveform is computed by interpolating a small number of
quasi-circular NR wavef... | [
{
"created": "Wed, 6 Sep 2017 21:27:58 GMT",
"version": "v1"
}
] | 2018-08-15 | [
[
"Hinder",
"Ian",
""
],
[
"Kidder",
"Lawrence E.",
""
],
[
"Pfeiffer",
"Harald P.",
""
]
] | We present a prescription for computing gravitational waveforms for the inspiral, merger and ringdown of non-spinning eccentric binary black hole systems. The inspiral waveform is computed using the post-Newtonian expansion and the merger waveform is computed by interpolating a small number of quasi-circular NR wavefor... |
1911.13228 | Sergey Rubin | S.G. Rubin | Cosmology and matter induced branes | 23 pages, 2 figures | Symmetry 2020, 12(1), 45 | 10.3390/sym12010045 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The extra space paradigm plays a significant role in modern physics and in
cosmology as the specific case. In this review, the relation between the main
cosmological parameters - Planck mass and Cosmological constants - and a metric
of extra space is discussed. Matter distribution inside extra space and its
effect on... | [
{
"created": "Tue, 26 Nov 2019 07:04:41 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Dec 2019 06:43:34 GMT",
"version": "v2"
}
] | 2019-12-30 | [
[
"Rubin",
"S. G.",
""
]
] | The extra space paradigm plays a significant role in modern physics and in cosmology as the specific case. In this review, the relation between the main cosmological parameters - Planck mass and Cosmological constants - and a metric of extra space is discussed. Matter distribution inside extra space and its effect on t... |
1907.11949 | Flavio Bombacigno | Flavio Bombacigno, Fabio Moretti and Giovanni Montani | Scalar modes in extended hybrid metric-Palatini gravity: weak field
phenomenology | 14 pages, 1 figure. Comments are welcome | Phys. Rev. D 100, 124036 (2019) | 10.1103/PhysRevD.100.124036 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We investigate the nature of additional scalar degrees of freedom contained
in extended hybrid metric-Palatini gravity, outlining the emergence of two
coupled dynamical scalar modes. In particular, we discuss the weak field limit
of the theory, both in the static case and from a gravitational waves
perspective. In th... | [
{
"created": "Sat, 27 Jul 2019 17:06:36 GMT",
"version": "v1"
},
{
"created": "Sun, 10 Nov 2019 20:25:49 GMT",
"version": "v2"
}
] | 2019-12-17 | [
[
"Bombacigno",
"Flavio",
""
],
[
"Moretti",
"Fabio",
""
],
[
"Montani",
"Giovanni",
""
]
] | We investigate the nature of additional scalar degrees of freedom contained in extended hybrid metric-Palatini gravity, outlining the emergence of two coupled dynamical scalar modes. In particular, we discuss the weak field limit of the theory, both in the static case and from a gravitational waves perspective. In the ... |
0903.5319 | Barry Wardell | Marc Casals, Sam Dolan, Adrian Ottewill, Barry Wardell | Pade Approximants of the Green Function in Spherically Symmetric
Spacetimes | 19 pages, 12 figures | Phys.Rev.D79:124044,2009 | 10.1103/PhysRevD.79.124044 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the scalar Green function for spherically symmetric spacetimes
expressed as a coordinate series expansion in the separation of the points. We
calculate the series expansion of the function $V(x,x')$ appearing in the
Hadamard parametrix of the scalar Green function to very high order. This
expansion is ... | [
{
"created": "Tue, 31 Mar 2009 18:39:06 GMT",
"version": "v1"
}
] | 2009-07-09 | [
[
"Casals",
"Marc",
""
],
[
"Dolan",
"Sam",
""
],
[
"Ottewill",
"Adrian",
""
],
[
"Wardell",
"Barry",
""
]
] | We investigate the scalar Green function for spherically symmetric spacetimes expressed as a coordinate series expansion in the separation of the points. We calculate the series expansion of the function $V(x,x')$ appearing in the Hadamard parametrix of the scalar Green function to very high order. This expansion is th... |
0803.3367 | Grigory Volovik | G.E. Volovik | On de Sitter radiation via quantum tunneling | 15 pages, no figures, IJMPD style, version submitted to IJMPD | Int. J. Mod. Phys. D 18 (2009) 1227-1241 | 10.1142/S0218271809015035 | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss why the tunneling picture does not necessarily lead to Hawking
radiation from the de Sitter horizon. The experience with the condensed matter
analogs of event horizon suggests that the de Sitter vacuum is stable against
the Hawking radiation. On the other hand the detector immersed into the de
Sitter backg... | [
{
"created": "Mon, 24 Mar 2008 06:47:42 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Mar 2008 20:53:21 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Apr 2008 14:11:57 GMT",
"version": "v3"
},
{
"created": "Wed, 21 Jan 2009 18:52:15 GMT",
"version": "v4"
},
{
"cr... | 2015-05-13 | [
[
"Volovik",
"G. E.",
""
]
] | We discuss why the tunneling picture does not necessarily lead to Hawking radiation from the de Sitter horizon. The experience with the condensed matter analogs of event horizon suggests that the de Sitter vacuum is stable against the Hawking radiation. On the other hand the detector immersed into the de Sitter backgro... |
1904.01427 | Rocco D'Agostino | Salvatore Capozziello, Rocco D'Agostino, Orlando Luongo | Extended Gravity Cosmography | 82 pages, 35 figures. Accepted for publication in IJMPD | null | 10.1142/S0218271819300167 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmography can be considered as a sort of a model-independent approach to
tackle the dark energy/modified gravity problem. In this review, the success
and the shortcomings of the $\Lambda$CDM model, based on General Relativity and
standard model of particles, are discussed in view of the most recent
observational co... | [
{
"created": "Mon, 1 Apr 2019 09:35:25 GMT",
"version": "v1"
}
] | 2019-04-09 | [
[
"Capozziello",
"Salvatore",
""
],
[
"D'Agostino",
"Rocco",
""
],
[
"Luongo",
"Orlando",
""
]
] | Cosmography can be considered as a sort of a model-independent approach to tackle the dark energy/modified gravity problem. In this review, the success and the shortcomings of the $\Lambda$CDM model, based on General Relativity and standard model of particles, are discussed in view of the most recent observational cons... |
1701.05828 | Nathaniel Barlow | Nathaniel S. Barlow, Steven J. Weinstein, and Joshua A. Faber | An asymptotically consistent approximant for the equatorial bending
angle of light due to Kerr black holes | 16 pages, 7 figures, submitted to Classical and Quantum Gravity | Class. Quantum Grav. 34 (2017) 135017 | 10.1088/1361-6382/aa7538 | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by-sa/4.0/ | An accurate closed-form expression is provided to predict the bending angle
of light as a function of impact parameter for equatorial orbits around Kerr
black holes of arbitrary spin. This expression is constructed by assuring that
the weak- and strong-deflection limits are explicitly satisfied while
maintaining accu... | [
{
"created": "Fri, 20 Jan 2017 15:35:55 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Jun 2017 20:24:33 GMT",
"version": "v2"
}
] | 2017-06-29 | [
[
"Barlow",
"Nathaniel S.",
""
],
[
"Weinstein",
"Steven J.",
""
],
[
"Faber",
"Joshua A.",
""
]
] | An accurate closed-form expression is provided to predict the bending angle of light as a function of impact parameter for equatorial orbits around Kerr black holes of arbitrary spin. This expression is constructed by assuring that the weak- and strong-deflection limits are explicitly satisfied while maintaining accura... |
1302.2610 | I. V. Kanatchikov | I.V. Kanatchikov | De Donder-Weyl Hamiltonian formulation and precanonical quantization of
vielbein gravity | 14 pages. v2 corrects small typos in (35) and the equation preceding
(12) | J. Phys.: Conf. Ser. 442 012041 (2013) | 10.1088/1742-6596/442/1/012041 | null | gr-qc hep-th math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The De Donder-Weyl (DW) covariant Hamiltonian formulation of Palatini
first-order Lagrangian of vielbein (tetrad) gravity and its precanonical
quantization are presented. No splitting into the space and time is required in
this formulation. Our recent generalization of Dirac brackets is used to treat
the second class... | [
{
"created": "Mon, 11 Feb 2013 20:54:33 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Jan 2015 16:16:59 GMT",
"version": "v2"
}
] | 2015-01-28 | [
[
"Kanatchikov",
"I. V.",
""
]
] | The De Donder-Weyl (DW) covariant Hamiltonian formulation of Palatini first-order Lagrangian of vielbein (tetrad) gravity and its precanonical quantization are presented. No splitting into the space and time is required in this formulation. Our recent generalization of Dirac brackets is used to treat the second class p... |
2305.12113 | Nicolas Menicucci | Sundance O. Bilson-Thompson, Scott L. Todd, James Read, Valentina
Baccetti, Nicolas C. Menicucci | Tachyonic media in analogue models of special relativity | (v2) minor changes after peer review; (v1) 13 pages, 4 figures | Phys. Rev. D 108, 124020 (2023) | 10.1103/PhysRevD.108.124020 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In sonic models of special relativity, the fact that the sonic medium
violates (ordinary) Lorentz symmetry is apparent to observers external to the
sonic medium but not to a class of observers existing within the medium itself.
We show that the situation is symmetric: internal observers will judge physics
in the exte... | [
{
"created": "Sat, 20 May 2023 06:24:09 GMT",
"version": "v1"
},
{
"created": "Sat, 9 Sep 2023 13:00:59 GMT",
"version": "v2"
}
] | 2024-02-07 | [
[
"Bilson-Thompson",
"Sundance O.",
""
],
[
"Todd",
"Scott L.",
""
],
[
"Read",
"James",
""
],
[
"Baccetti",
"Valentina",
""
],
[
"Menicucci",
"Nicolas C.",
""
]
] | In sonic models of special relativity, the fact that the sonic medium violates (ordinary) Lorentz symmetry is apparent to observers external to the sonic medium but not to a class of observers existing within the medium itself. We show that the situation is symmetric: internal observers will judge physics in the extern... |
1511.00636 | Christian Corda Prof. | Rishabh Jain, Burra G. Sidharth and Christian Corda | The Jeans theorem and the "Tolman-Oppenheimer-Volkov equation" in an
exact wave solution of R^2 gravity | Comments: 15 pages, the results of arXiv:1105.0147 have been
partially reviewed. Final version matching the one published in the Adv. High
En. Phys. Special Issue "Classical and Quantum Gravity and Its Applications"
Edited by S. Hossein Hendi and others | Adv. High. En. Phys. 2601741 (2016) | 10.1155/2016/2601741 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Corda, Mosquera Cuesta and Lorduy Gomez have shown that spherically symmetric
stationary states can be used as a model for galaxies in the framework of the
linearized R^2 gravity. Those states could represent a partial solution to the
Dark Matter Problem. Here we discuss an improvement of this work. In fact, as
the s... | [
{
"created": "Fri, 23 Oct 2015 21:08:24 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Nov 2015 08:06:14 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Jun 2016 07:26:50 GMT",
"version": "v3"
},
{
"created": "Thu, 8 Sep 2016 14:21:21 GMT",
"version": "v4"
},
{
"cr... | 2016-10-17 | [
[
"Jain",
"Rishabh",
""
],
[
"Sidharth",
"Burra G.",
""
],
[
"Corda",
"Christian",
""
]
] | Corda, Mosquera Cuesta and Lorduy Gomez have shown that spherically symmetric stationary states can be used as a model for galaxies in the framework of the linearized R^2 gravity. Those states could represent a partial solution to the Dark Matter Problem. Here we discuss an improvement of this work. In fact, as the sta... |
1708.04698 | Valeri Frolov P | Valeri P. Frolov | Remarks on non-singular black holes | 10 pages, Extended version of the plenary talk given at a Joint
Meeting: 13th International Conference on Gravitation, Astrophysics, and
Cosmology 15th Italian-Korean Symposium on Relativistic Astrophysics, Seoul,
July 03--07, 2017 | null | 10.1051/epjconf/201816801001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We briefly discuss non-singular black hole models, with the main focus on the
properties of non-singular evaporating black holes. Such black holes possess an
apparent horizon, however the event horizon may be absent. In such a case, the
information from the black hole interior may reach the external observer after
th... | [
{
"created": "Tue, 15 Aug 2017 21:51:23 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Aug 2017 20:02:29 GMT",
"version": "v2"
}
] | 2018-01-24 | [
[
"Frolov",
"Valeri P.",
""
]
] | We briefly discuss non-singular black hole models, with the main focus on the properties of non-singular evaporating black holes. Such black holes possess an apparent horizon, however the event horizon may be absent. In such a case, the information from the black hole interior may reach the external observer after the ... |
2205.09050 | Denis Dobkowski-Ry{\l}ko | Denis Dobkowski-Ry{\l}ko and Jerzy Lewandowski | A generalization of the quadruple formula for the energy of
gravitational radiation in de Sitter spacetime | 13+7 pages, 1 figure | null | 10.1103/PhysRevD.106.044047 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study gravitational radiation produced by time changing matter source in
de Sitter spacetime. We consider a cosmological Killing horizon instead of the
conformal boundary used in the radiation theory in the Minkowski spacetime. The
energy of the radiation passing through the horizon is derived. Our result
takes th... | [
{
"created": "Wed, 18 May 2022 16:34:25 GMT",
"version": "v1"
}
] | 2022-09-07 | [
[
"Dobkowski-Ryłko",
"Denis",
""
],
[
"Lewandowski",
"Jerzy",
""
]
] | We study gravitational radiation produced by time changing matter source in de Sitter spacetime. We consider a cosmological Killing horizon instead of the conformal boundary used in the radiation theory in the Minkowski spacetime. The energy of the radiation passing through the horizon is derived. Our result takes the ... |
1908.11258 | Giovanni Camelio | Giovanni Camelio, Tim Dietrich, Miguel Marques and Stephan Rosswog | Rotating neutron stars with non-barotropic thermal profile | 18 pages, 3 appendices, 2 tables, 9 figures. Accepted by PRD | Phys. Rev. D 100, 123001 (2019) | 10.1103/PhysRevD.100.123001 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutron stars provide an excellent laboratory for physics under the most
extreme conditions. Up to now, models of axisymmetric, stationary,
differentially rotating neutron stars were constructed under the strong
assumption of barotropicity, where a one-to-one relation between all
thermodynamic quantities exists. This... | [
{
"created": "Thu, 29 Aug 2019 14:35:09 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Nov 2019 13:58:46 GMT",
"version": "v2"
}
] | 2019-12-11 | [
[
"Camelio",
"Giovanni",
""
],
[
"Dietrich",
"Tim",
""
],
[
"Marques",
"Miguel",
""
],
[
"Rosswog",
"Stephan",
""
]
] | Neutron stars provide an excellent laboratory for physics under the most extreme conditions. Up to now, models of axisymmetric, stationary, differentially rotating neutron stars were constructed under the strong assumption of barotropicity, where a one-to-one relation between all thermodynamic quantities exists. This i... |
0905.3362 | Willians Barreto | W. Barreto | The Post-Quasistatic Approximation as a test bed for Numerical
Relativity | 4 pages; to appear as a Brief Report in Physical Review D | Phys.Rev.D79:107502,2009 | 10.1103/PhysRevD.79.107502 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that observers in the standard ADM 3+1 treatment of matter are
the same as the observers used in the matter treatment of Bondi: they are
comoving and local Minkowskian. Bondi's observers are the basis of the
post--quasitatic approximation (PQSA) to study a contracting distribution of
matter. This correspo... | [
{
"created": "Wed, 20 May 2009 17:41:46 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Barreto",
"W.",
""
]
] | It is shown that observers in the standard ADM 3+1 treatment of matter are the same as the observers used in the matter treatment of Bondi: they are comoving and local Minkowskian. Bondi's observers are the basis of the post--quasitatic approximation (PQSA) to study a contracting distribution of matter. This correspond... |
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