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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/0309015 | Eanna E. Flanagan | Eanna E. Flanagan | Higher order gravity theories and scalar tensor theories | 5 pages, no figures, revtex; references added | Class.Quant.Grav. 21 (2003) 417-426 | 10.1088/0264-9381/21/2/006 | null | gr-qc astro-ph hep-th | null | We generalize the known equivalence between higher order gravity theories and
scalar tensor theories to a new class of theories. Specifically, in the context
of a first order or Palatini variational principle where the metric and
connection are treated as independent variables, we consider theories for which
the Lagr... | [
{
"created": "Wed, 3 Sep 2003 05:59:32 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Sep 2003 19:55:26 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Flanagan",
"Eanna E.",
""
]
] | We generalize the known equivalence between higher order gravity theories and scalar tensor theories to a new class of theories. Specifically, in the context of a first order or Palatini variational principle where the metric and connection are treated as independent variables, we consider theories for which the Lagran... |
1210.6346 | Farook Rahaman | Farook Rahaman, Ayan Banerjee, Irina Radinschi, Sumita Banerjee and
Soumendranath Ruz | Singularity free stars in (2+1) dimensions | 8 pages, 11 figures. Accepted in IJTP | null | 10.1007/s10773-012-1406-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present some new types of non-singular model for anisotropic stars with
constant $\Lambda $ and variable $\Lambda$ based on the Krori and Barua (KB)
metric in $(2+1)$ dimensions. The solutions obtained here satisfy all the
regularity conditions and its simple analytical form helps us to study the
various physical ... | [
{
"created": "Tue, 23 Oct 2012 11:36:59 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Rahaman",
"Farook",
""
],
[
"Banerjee",
"Ayan",
""
],
[
"Radinschi",
"Irina",
""
],
[
"Banerjee",
"Sumita",
""
],
[
"Ruz",
"Soumendranath",
""
]
] | We present some new types of non-singular model for anisotropic stars with constant $\Lambda $ and variable $\Lambda$ based on the Krori and Barua (KB) metric in $(2+1)$ dimensions. The solutions obtained here satisfy all the regularity conditions and its simple analytical form helps us to study the various physical pr... |
gr-qc/9510025 | Gerard Clement | G\'erard Cl\'ement | Spinning charged BTZ black holes and self-dual particle-like solutions | 10 pages, LaTex, no figures | Phys.Lett. B367 (1996) 70-74 | 10.1016/0370-2693(95)01464-0 | GCR-95/10/02 | gr-qc hep-th | null | We generate from the static charged BTZ black hole a family of spinning
charged solutions to the Einstein-Maxwell equations in 2+1 dimensions. These
solutions go over, in a suitable limit, to self-dual spinning charged
solutions, which are horizonless and regular, with logarithmically divergent
mass and spin. To cure... | [
{
"created": "Fri, 13 Oct 1995 13:16:49 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Clément",
"Gérard",
""
]
] | We generate from the static charged BTZ black hole a family of spinning charged solutions to the Einstein-Maxwell equations in 2+1 dimensions. These solutions go over, in a suitable limit, to self-dual spinning charged solutions, which are horizonless and regular, with logarithmically divergent mass and spin. To cure t... |
gr-qc/0309019 | Vladimir Majernik | V. Majernik | The force exerting on cosmic bodies in a quaternionc field | 8 pages, no figures | Gen.Rel.Grav. 36 (2004) 1143-1150 | 10.1023/B:GERG.0000018280.96739.ae | null | gr-qc | null | The expression of a time-dependent cosmological constant $\lambda \propto
1/t^2$ is interpreted as the energy density of a special type of the
quaternionic field. The Lorenz-like force acting on the moving body in the
presence of this quaternionic field is determined. The astronomical and
terrestrial effects of this ... | [
{
"created": "Wed, 3 Sep 2003 10:07:57 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Majernik",
"V.",
""
]
] | The expression of a time-dependent cosmological constant $\lambda \propto 1/t^2$ is interpreted as the energy density of a special type of the quaternionic field. The Lorenz-like force acting on the moving body in the presence of this quaternionic field is determined. The astronomical and terrestrial effects of this fi... |
2302.11227 | Yuan-Chuan Zou | Hao Wang, Yuan-Chuan Zou, Yu Liu | Phenomenological relationship between eccentric and quasi-circular
orbital binary black hole waveform | 19 pages, 18 figures | null | 10.1103/PhysRevD.107.124061 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Eccentricity, an important parameter of gravitational waves, has been paid
more and more attention because it can reflect the dynamics of compact object
mergers. Obtaining an accurate and fast gravitational waveform template is of
great significance for the estimation of gravitational wave parameters. This
paper aims... | [
{
"created": "Wed, 22 Feb 2023 09:18:41 GMT",
"version": "v1"
}
] | 2023-07-12 | [
[
"Wang",
"Hao",
""
],
[
"Zou",
"Yuan-Chuan",
""
],
[
"Liu",
"Yu",
""
]
] | Eccentricity, an important parameter of gravitational waves, has been paid more and more attention because it can reflect the dynamics of compact object mergers. Obtaining an accurate and fast gravitational waveform template is of great significance for the estimation of gravitational wave parameters. This paper aims t... |
0705.3109 | T. Damour | Thibault Damour | Black Hole and Neutron Star Binaries: Theoretical Challenges | 53 pages, 3 eps figures, to appear in a revised edition of the book:
Neutron Stars, Black Holes and Binary X-Ray Sources by H. Gursky and R.
Ruffini | null | null | null | gr-qc | null | Some of the theoretical challenges posed by the general relativistic
description of binary systems of compact objects (neutron stars or black holes)
are reviewed. We recall the various ways one can use the theory of the motion,
and of the timing, of binary pulsars to test the strong-field and/or radiative
aspects of ... | [
{
"created": "Tue, 22 May 2007 08:24:16 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Damour",
"Thibault",
""
]
] | Some of the theoretical challenges posed by the general relativistic description of binary systems of compact objects (neutron stars or black holes) are reviewed. We recall the various ways one can use the theory of the motion, and of the timing, of binary pulsars to test the strong-field and/or radiative aspects of Ge... |
1907.06854 | Luis Granda | L. N. Granda | $\Lambda$CDM-like models with future singularities | 32 pages, 6 figures, to appear in EPJP | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider new models of dark energy with finite time future singularities,
by introducing the pressure density as a function of the scale factor. This
approach gives acceptable phenomenological models of dark energy, practically
indistinguishable from the cosmological constant up to the present, which face
future s... | [
{
"created": "Tue, 16 Jul 2019 06:05:49 GMT",
"version": "v1"
}
] | 2019-07-17 | [
[
"Granda",
"L. N.",
""
]
] | We consider new models of dark energy with finite time future singularities, by introducing the pressure density as a function of the scale factor. This approach gives acceptable phenomenological models of dark energy, practically indistinguishable from the cosmological constant up to the present, which face future sin... |
2302.11915 | Jo\~ao Lu\'is Rosa | Jo\~ao Lu\'is Rosa | Observational properties of relativistic fluid spheres with thin
accretion disks | 22 pages, 25 figures | Phys. Rev. D 107, 084048 (2023) | 10.1103/PhysRevD.107.084048 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we analyze the observational properties of incompressible
relativistic fluid spheres with and without thin-shells, when surrounded by
thin accretion disks. We consider a set of six configurations with different
combinations of the star radius $R$ and the thin-shell radius $r_\Sigma$ to
produce solutions ... | [
{
"created": "Thu, 23 Feb 2023 10:45:13 GMT",
"version": "v1"
}
] | 2023-05-01 | [
[
"Rosa",
"João Luís",
""
]
] | In this work we analyze the observational properties of incompressible relativistic fluid spheres with and without thin-shells, when surrounded by thin accretion disks. We consider a set of six configurations with different combinations of the star radius $R$ and the thin-shell radius $r_\Sigma$ to produce solutions wi... |
2407.05111 | Piyali Bhar | Piyali Bhar, Allah Ditta, and Abdelghani Errehymy | Noncommutative wormhole in de Rham-Gabadadze-Tolley like massive gravity | 16 pages, Accepted in Nuclear Physics B | Nucl. Phys. B 1006 (2024) 116621 | 10.1016/j.nuclphysb.2024.116621 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The wormhole solution in dRGT massive gravity is examined in this paper in
the background of non-commutative geometry. In order to derive the wormhole
model, along with the zero tidal force, we assume that the matter distribution
is given by the Gaussian and Lorentzian distributions. The shape function in
both models... | [
{
"created": "Sat, 6 Jul 2024 15:41:17 GMT",
"version": "v1"
}
] | 2024-07-30 | [
[
"Bhar",
"Piyali",
""
],
[
"Ditta",
"Allah",
""
],
[
"Errehymy",
"Abdelghani",
""
]
] | The wormhole solution in dRGT massive gravity is examined in this paper in the background of non-commutative geometry. In order to derive the wormhole model, along with the zero tidal force, we assume that the matter distribution is given by the Gaussian and Lorentzian distributions. The shape function in both models i... |
1205.3134 | Andrei Lebed G | Andrei Lebed | Breakdown of the Equivalence between Energy Content and Weight in a Weak
Gravitational Field for a Quantum Body | Talk at the American Physical Society April Meeting (Atlanta, USA,
April 1st, 2012) | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that weight operator of a composite quantum body in a weak
external gravitational field in the post-Newtonian approximation of the General
Relativity does not commute with its energy operator, taken in the absence of
the field. Nevertheless, the weak equivalence between the expectations values
of weight a... | [
{
"created": "Mon, 14 May 2012 18:44:57 GMT",
"version": "v1"
}
] | 2012-05-15 | [
[
"Lebed",
"Andrei",
""
]
] | It is shown that weight operator of a composite quantum body in a weak external gravitational field in the post-Newtonian approximation of the General Relativity does not commute with its energy operator, taken in the absence of the field. Nevertheless, the weak equivalence between the expectations values of weight and... |
gr-qc/0412138 | Kirill Bronnikov | K.A. Bronnikov, E.A. Tagirov | Quantum theory of scalar field in isotropic world | 7 pages, gc.sty. Published for the first time in Russian in 1968 as
JINR Preprint. With E.A. Tagirov's comment of September 2004 | Grav.Cosmol. 10 (2004) 249-255 | null | JINR P2-4151, Dubna, 1968 | gr-qc | null | Fock representations are constructed for a free scalar field in the closed
and quasi-Euclidean isotropic cosmological models. Invariance of their cyclic
vector (vacuum) under isometries and the correspondence principle single out a
class of unitarily equivalent representations.
| [
{
"created": "Thu, 30 Dec 2004 18:39:59 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bronnikov",
"K. A.",
""
],
[
"Tagirov",
"E. A.",
""
]
] | Fock representations are constructed for a free scalar field in the closed and quasi-Euclidean isotropic cosmological models. Invariance of their cyclic vector (vacuum) under isometries and the correspondence principle single out a class of unitarily equivalent representations. |
1905.04586 | Gilles Esposito-Farese | Gilles Esposito-Farese | Hamiltonian vs stability in alternative theories of gravity | 9 pages, 2 figures, uses the LaTeX class file "moriond.cls",
contribution to the 2019 Gravitation session of the 54th Rencontres de
Moriond | Proceedings of the 54th Rencontres de Moriond, La Thuile, ARISF
(2019), 201-8 | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When a Hamiltonian density is bounded by below, we know that the
lowest-energy state must be stable. One is often tempted to reverse the theorem
and therefore believe that an unbounded Hamiltonian density always implies an
instability. The main purpose of this presentation (which summarizes my work
with E. Babichev, ... | [
{
"created": "Sat, 11 May 2019 20:31:54 GMT",
"version": "v1"
}
] | 2023-12-08 | [
[
"Esposito-Farese",
"Gilles",
""
]
] | When a Hamiltonian density is bounded by below, we know that the lowest-energy state must be stable. One is often tempted to reverse the theorem and therefore believe that an unbounded Hamiltonian density always implies an instability. The main purpose of this presentation (which summarizes my work with E. Babichev, C.... |
1101.5059 | Anja Marunovic | Anja Marunovic and Tomislav Prokopec | Time transients in the quantum corrected Newtonian potential induced by
a massless nonminimally coupled scalar field | 22 pages, 5 figures; detailed calculation of the graviton vacuum
polarization moved to the new Appendix; matches published version | Phys.Rev.D83:104039,2011 | 10.1103/PhysRevD.83.104039 | ITP-UU-11/04, SPIN-11/02 | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the one loop graviton vacuum polarization induced by a massless,
nonminimally coupled scalar field on Minkowski background. We make use of the
Schwinger-Keldysh formalism, which allows us to study time dependent phenomena.
As an application we compute the leading quantum correction to the Newtonian
poten... | [
{
"created": "Wed, 26 Jan 2011 13:50:20 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Sep 2011 16:08:52 GMT",
"version": "v2"
}
] | 2015-03-18 | [
[
"Marunovic",
"Anja",
""
],
[
"Prokopec",
"Tomislav",
""
]
] | We calculate the one loop graviton vacuum polarization induced by a massless, nonminimally coupled scalar field on Minkowski background. We make use of the Schwinger-Keldysh formalism, which allows us to study time dependent phenomena. As an application we compute the leading quantum correction to the Newtonian potenti... |
1504.04582 | Wen-Biao Liu | Jing-Zhao Qi, Ming-Jian Zhang, Wen-Biao Liu | Dynamical evolution of quintessence cosmology in a physical phase space | Accepted: 21 March 2016, Int J Theor Phys 2016 | null | 10.1007/s10773-016-2996-9 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The phase space analysis of cosmological parameters $\Omega_{\phi}$ and
$\gamma_{\phi}$ is given. Based on this, the well-known quintessence cosmology
is studied with an exponential potential $V(\phi)=V_{0}\exp(-\lambda\phi)$.
Given observational data, the current state of universe could be pinpointed in
the phase di... | [
{
"created": "Thu, 16 Apr 2015 08:44:56 GMT",
"version": "v1"
},
{
"created": "Thu, 14 May 2015 14:17:47 GMT",
"version": "v2"
},
{
"created": "Sun, 12 Jun 2016 07:31:19 GMT",
"version": "v3"
}
] | 2016-06-14 | [
[
"Qi",
"Jing-Zhao",
""
],
[
"Zhang",
"Ming-Jian",
""
],
[
"Liu",
"Wen-Biao",
""
]
] | The phase space analysis of cosmological parameters $\Omega_{\phi}$ and $\gamma_{\phi}$ is given. Based on this, the well-known quintessence cosmology is studied with an exponential potential $V(\phi)=V_{0}\exp(-\lambda\phi)$. Given observational data, the current state of universe could be pinpointed in the phase diag... |
2111.01064 | Michael Katz | Michael L. Katz | A fully-automated end-to-end pipeline for massive black hole binary
signal extraction from LISA data | 14 pages, 6 figures, 3 tables | null | 10.1103/PhysRevD.105.044055 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The LISA Data Challenges Working Group within the LISA Consortium has started
publishing datasets to benchmark, compare, and build LISA data analysis
infrastructure as the Consortium prepares for the launch of the mission. We
present our solution to the dataset from LISA Data Challenge (LDC) 1A
containing a single ma... | [
{
"created": "Mon, 1 Nov 2021 16:22:10 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Jan 2022 23:30:51 GMT",
"version": "v2"
},
{
"created": "Tue, 22 Feb 2022 00:26:42 GMT",
"version": "v3"
}
] | 2022-03-09 | [
[
"Katz",
"Michael L.",
""
]
] | The LISA Data Challenges Working Group within the LISA Consortium has started publishing datasets to benchmark, compare, and build LISA data analysis infrastructure as the Consortium prepares for the launch of the mission. We present our solution to the dataset from LISA Data Challenge (LDC) 1A containing a single mass... |
1408.6983 | Andrea Geralico | Donato Bini, Andrea Geralico, Maria Haney | Refraction index analysis of light propagation in a colliding
gravitational wave spacetime | 16 pages, 6 figures; published version | Gen. Relativ. Gravit. 46, 1644 (2014) | 10.1007/s10714-013-1644-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The optical medium analogy of a given spacetime was developed decades ago and
has since then been widely applied to different gravitational contexts. Here we
consider the case of a colliding gravitational wave spacetime, generalizing
previous results concerning single gravitational pulses. Given the complexity
of the... | [
{
"created": "Fri, 29 Aug 2014 11:18:31 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Bini",
"Donato",
""
],
[
"Geralico",
"Andrea",
""
],
[
"Haney",
"Maria",
""
]
] | The optical medium analogy of a given spacetime was developed decades ago and has since then been widely applied to different gravitational contexts. Here we consider the case of a colliding gravitational wave spacetime, generalizing previous results concerning single gravitational pulses. Given the complexity of the n... |
0808.0475 | Edward Glass | J.P. Krisch and E.N. Glass | Thin Shell Dynamics and Equations of State | null | Phys.Rev.D78:044003,2008 | 10.1103/PhysRevD.78.044003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A relation between stress-energy and motion is derived for accelerated Israel
layers. The relation, for layers between two Schwarzschild manifolds,
generalizes the equation of state for geodesic collapse. A set of linked layers
is discussed.
| [
{
"created": "Mon, 4 Aug 2008 18:07:00 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Krisch",
"J. P.",
""
],
[
"Glass",
"E. N.",
""
]
] | A relation between stress-energy and motion is derived for accelerated Israel layers. The relation, for layers between two Schwarzschild manifolds, generalizes the equation of state for geodesic collapse. A set of linked layers is discussed. |
1504.07606 | Emmanuil Saridakis | Genly Leon (Valparaiso U., Catolica), Emmanuel N. Saridakis (Natl.
Tech. U., Athens & Valparaiso U., Catolica) | Cosmology in time asymmetric extensions of general relativity | 42 pages, 6 figures, 8 tables, version published in JCAP | JCAP 1511 (2015) 11, 009 | 10.1088/1475-7516/2015/11/009 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the cosmological behavior in a universe governed by time
asymmetric extensions of general relativity, which is a novel modified gravity
based on the addition of new, time-asymmetric, terms on the Hamiltonian
framework, in a way that the algebra of constraints and local physics remain
unchanged. Neverth... | [
{
"created": "Tue, 28 Apr 2015 19:24:09 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Nov 2015 19:21:43 GMT",
"version": "v2"
}
] | 2015-11-11 | [
[
"Leon",
"Genly",
"",
"Valparaiso U., Catolica"
],
[
"Saridakis",
"Emmanuel N.",
"",
"Natl.\n Tech. U., Athens & Valparaiso U., Catolica"
]
] | We investigate the cosmological behavior in a universe governed by time asymmetric extensions of general relativity, which is a novel modified gravity based on the addition of new, time-asymmetric, terms on the Hamiltonian framework, in a way that the algebra of constraints and local physics remain unchanged. Neverthel... |
2007.01591 | Abdulla Al Mamon | Abdulla Al Mamon | Study of Tsallis holographic dark energy model in the framework of
Fractal cosmology | 6 pages, 5 figures, Accepted for publication in MPLA | null | 10.1142/S021773232050251X | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we study the evolution of a fractal universe composed of
Tsallis holographic dark energy (THDE) and a pressureless dark matter that
interact with each other through a mutual interaction. We then reconstruct the
interaction term of this model by considering the Hubble length as the IR
cut-off scale. We a... | [
{
"created": "Fri, 3 Jul 2020 10:11:35 GMT",
"version": "v1"
}
] | 2020-10-28 | [
[
"Mamon",
"Abdulla Al",
""
]
] | In this work, we study the evolution of a fractal universe composed of Tsallis holographic dark energy (THDE) and a pressureless dark matter that interact with each other through a mutual interaction. We then reconstruct the interaction term of this model by considering the Hubble length as the IR cut-off scale. We als... |
2403.16192 | Galin Gyulchev | Eugeny Babichev, Christos Charmousis, Daniela D. Doneva, Galin N.
Gyulchev and Stoytcho S. Yazadjiev | Testing disformal non-circular deformation of Kerr black holes with LISA | 19 pages, 13 figures; v2: references added | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | There is strong observational evidence that almost every large galaxy has a
supermassive black hole at its center. It is of fundamental importance to know
whether such black holes are described by the standard Kerr solution in General
Relativity (GR) or by another black hole solution. An interesting alternative
is th... | [
{
"created": "Sun, 24 Mar 2024 15:18:00 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jun 2024 21:30:54 GMT",
"version": "v2"
}
] | 2024-06-14 | [
[
"Babichev",
"Eugeny",
""
],
[
"Charmousis",
"Christos",
""
],
[
"Doneva",
"Daniela D.",
""
],
[
"Gyulchev",
"Galin N.",
""
],
[
"Yazadjiev",
"Stoytcho S.",
""
]
] | There is strong observational evidence that almost every large galaxy has a supermassive black hole at its center. It is of fundamental importance to know whether such black holes are described by the standard Kerr solution in General Relativity (GR) or by another black hole solution. An interesting alternative is the ... |
gr-qc/0110108 | Adam D. Helfer | Adam D. Helfer | Red-shifts near black holes | 20 pages, plain Tex, IOP macros, 4 eps figures, accepted by CQG | Class.Quant.Grav. 18 (2001) 5413-5428 | 10.1088/0264-9381/18/24/307 | null | gr-qc | null | A simple ordinary differential equation is derived governing the red-shifts
of wave-fronts propagating through a non-stationary spherically symmetric
space-time. Approach to an event horizon corresponds to approach to a fixed
point; in general, the phase portrait of the equation illuminates the
qualitative features o... | [
{
"created": "Wed, 24 Oct 2001 17:13:23 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Helfer",
"Adam D.",
""
]
] | A simple ordinary differential equation is derived governing the red-shifts of wave-fronts propagating through a non-stationary spherically symmetric space-time. Approach to an event horizon corresponds to approach to a fixed point; in general, the phase portrait of the equation illuminates the qualitative features of ... |
0907.0696 | Jeffrey Hazboun | Jeffrey S Hazboun and Tevian Dray | The Effect of Negative-Energy Shells on the Schwarzschild Black Hole | 12 pages, 10 figures | Gen.Rel.Grav.42:1457-1467,2010 | 10.1007/s10714-009-0916-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct Penrose diagrams for Schwarzschild spacetimes joined by massless
shells of matter, in the process correcting minor flaws in the similar diagrams
drawn by Dray and 't Hooft, and confirming their result that such shells
generate a horizon shift. We then consider shells with negative energy density,
showing... | [
{
"created": "Fri, 3 Jul 2009 18:54:42 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Hazboun",
"Jeffrey S",
""
],
[
"Dray",
"Tevian",
""
]
] | We construct Penrose diagrams for Schwarzschild spacetimes joined by massless shells of matter, in the process correcting minor flaws in the similar diagrams drawn by Dray and 't Hooft, and confirming their result that such shells generate a horizon shift. We then consider shells with negative energy density, showing t... |
gr-qc/9901025 | Marco Spaans | Marco Spaans (Harvard CfA) | On the Topological Nature of Fundamental Interactions | null | null | null | null | gr-qc astro-ph hep-ph hep-th | null | A thought experiment is proposed to unify quantum mechanics and general
relativity. The central paradigm is that space-time {\it topology} is
ultimately responsible for the Heisenberg uncertaintly principle. It is found
that Plankian space-time exhibits a complicated, but also definite, multiply
connected character. ... | [
{
"created": "Sat, 9 Jan 1999 00:35:49 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Apr 2000 08:41:00 GMT",
"version": "v10"
},
{
"created": "Sun, 23 Apr 2000 16:03:22 GMT",
"version": "v11"
},
{
"created": "Fri, 12 May 2000 20:07:26 GMT",
"version": "v12"
},
{
... | 2007-05-23 | [
[
"Spaans",
"Marco",
"",
"Harvard CfA"
]
] | A thought experiment is proposed to unify quantum mechanics and general relativity. The central paradigm is that space-time {\it topology} is ultimately responsible for the Heisenberg uncertaintly principle. It is found that Plankian space-time exhibits a complicated, but also definite, multiply connected character. In... |
gr-qc/0608126 | Stephane Fay | Stephane Fay, Morad Amarzguioui | Large-scale structure and the Cardassian fluid | 10 pages, 18 figures, Accepted for publication in A&A | null | 10.1051/0004-6361:20064965 | null | gr-qc astro-ph | null | In this paper, we confront the predictions of the power law cardassian model
for the baryon power spectrum with the observations of the SDSS galaxy survey.
We show that they fit only for very unusual values of the cold dark matter or
baryon density parameters, the Hubble parameter or the spectral index of the
initial... | [
{
"created": "Tue, 29 Aug 2006 18:07:46 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Fay",
"Stephane",
""
],
[
"Amarzguioui",
"Morad",
""
]
] | In this paper, we confront the predictions of the power law cardassian model for the baryon power spectrum with the observations of the SDSS galaxy survey. We show that they fit only for very unusual values of the cold dark matter or baryon density parameters, the Hubble parameter or the spectral index of the initial p... |
gr-qc/0409066 | Kostas Kokkotas D. | Hajime Sotani and Kostas D. Kokkotas | Probing Strong-Field Scalar-Tensor Gravity with Gravitational Wave
Asteroseismology | 14 pages, 7 figures | Phys.Rev. D70 (2004) 084026 | 10.1103/PhysRevD.70.084026 | null | gr-qc astro-ph hep-th | null | We present an alternative way of tracing the existence of a scalar field
based on the analysis of the gravitational wave spectrum of a vibrating neutron
star. Scalar-tensor theories in strong-field gravity can potentially introduce
much greater differences in the parameters of a neutron star than the
uncertainties in... | [
{
"created": "Fri, 17 Sep 2004 06:58:41 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Oct 2004 10:28:00 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Sotani",
"Hajime",
""
],
[
"Kokkotas",
"Kostas D.",
""
]
] | We present an alternative way of tracing the existence of a scalar field based on the analysis of the gravitational wave spectrum of a vibrating neutron star. Scalar-tensor theories in strong-field gravity can potentially introduce much greater differences in the parameters of a neutron star than the uncertainties intr... |
2406.00506 | Bob Osano | Bob Osano | Dynamics of the transitions epochs in cosmological evolution | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study two transition periods in cosmology: radiation-to-matter and
matter-to-dark energy. In each case, we define a new parameter $\chi$ given by
the ratios of the two energy densities involved in the transition. Our study of
the second epoch is motivated by the need to understand cosmic acceleration.
Assuming a d... | [
{
"created": "Sat, 1 Jun 2024 17:28:37 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Jun 2024 17:47:20 GMT",
"version": "v2"
}
] | 2024-06-05 | [
[
"Osano",
"Bob",
""
]
] | We study two transition periods in cosmology: radiation-to-matter and matter-to-dark energy. In each case, we define a new parameter $\chi$ given by the ratios of the two energy densities involved in the transition. Our study of the second epoch is motivated by the need to understand cosmic acceleration. Assuming a dyn... |
gr-qc/0209045 | Uwe Gunther | U. Guenther, P. Moniz, A. Zhuk | Multidimensional cosmology and asymptotical AdS | 6 pages, kluwer.sty; Conf. Proc., 11th EAS Meeting: "JENAM 2002: The
Unsolved Universe", Porto, Portugal | Astrophys.Space Sci. 283 (2003) 679-684 | 10.1023/A:1022532313230 | null | gr-qc | null | A non-linear gravitational model with a multidimensional geometry and
quadratic scalar curvature is considered. For certain parameter ranges, the
extra dimensions are stabilized if the internal spaces have negative curvature.
As a consequence, the 4-dimensional effective cosmological constant as well as
the bulk cosm... | [
{
"created": "Fri, 13 Sep 2002 11:49:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Guenther",
"U.",
""
],
[
"Moniz",
"P.",
""
],
[
"Zhuk",
"A.",
""
]
] | A non-linear gravitational model with a multidimensional geometry and quadratic scalar curvature is considered. For certain parameter ranges, the extra dimensions are stabilized if the internal spaces have negative curvature. As a consequence, the 4-dimensional effective cosmological constant as well as the bulk cosmol... |
2205.14170 | Vania Vellucci | Vania Vellucci, Edgardo Franzin and Stefano Liberati | Echoes from backreacting exotic compact objects | 12 pages, 5 figures | Phys. Rev. D 107, 044027, 2023 | 10.1103/PhysRevD.107.044027 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The possible detection of echoes in late gravitational-wave signals is the
most promising way to test horizonless alternatives to general relativistic
black holes, and probe the physics of these hypothetical ultra-compact objects.
While there is currently no evidence for the presence of such signatures,
better accura... | [
{
"created": "Fri, 27 May 2022 18:00:14 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Feb 2023 10:56:02 GMT",
"version": "v2"
}
] | 2023-02-22 | [
[
"Vellucci",
"Vania",
""
],
[
"Franzin",
"Edgardo",
""
],
[
"Liberati",
"Stefano",
""
]
] | The possible detection of echoes in late gravitational-wave signals is the most promising way to test horizonless alternatives to general relativistic black holes, and probe the physics of these hypothetical ultra-compact objects. While there is currently no evidence for the presence of such signatures, better accuracy... |
gr-qc/9904014 | Wai-Mo Suen | Edward Seidel and Wai-Mo Suen | Numerical Relativity As A Tool For Computational Astrophysics | Review for JCAM | null | null | null | gr-qc | null | The astrophysics of compact objects, which requires Einstein's theory of
general relativity for understanding phenomena such as black holes and neutron
stars, is attracting increasing attention. In general relativity, gravity is
governed by an extremely complex set of coupled, nonlinear, hyperbolic-elliptic
partial d... | [
{
"created": "Tue, 6 Apr 1999 15:31:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Seidel",
"Edward",
""
],
[
"Suen",
"Wai-Mo",
""
]
] | The astrophysics of compact objects, which requires Einstein's theory of general relativity for understanding phenomena such as black holes and neutron stars, is attracting increasing attention. In general relativity, gravity is governed by an extremely complex set of coupled, nonlinear, hyperbolic-elliptic partial dif... |
0806.2611 | Marc-Thierry Jaekel | Marc-Thierry Jaekel, Serge Reynaud | Conformal symmetry and quantum localization in space-time | 9 pages | in XXVI Workshop on Geometrical Methods in Physics, Bialowieza
2007, AIP Conference Proceedings, Eds P. Kielanowski,A. Odzijewicz, M.
Schlichenmaier, T. Voronov, New York (2007) 61-72 | 10.1063/1.2820981 | LPTENS 07/44 | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The classical procedures which define the relativistic notion of space-time
can be implemented in the framework of Quantum Field Theory. Only relying on
the conformal symmetries of field propagation, time-frequency transfer and
localization lead to the definition of time-frequency references and positions
in space-ti... | [
{
"created": "Mon, 16 Jun 2008 15:34:41 GMT",
"version": "v1"
}
] | 2013-02-27 | [
[
"Jaekel",
"Marc-Thierry",
""
],
[
"Reynaud",
"Serge",
""
]
] | The classical procedures which define the relativistic notion of space-time can be implemented in the framework of Quantum Field Theory. Only relying on the conformal symmetries of field propagation, time-frequency transfer and localization lead to the definition of time-frequency references and positions in space-time... |
1105.1331 | Gaston Giribet | Hideki Maeda, Gaston Giribet | Lifshitz black holes in Brans-Dicke theory | 32 pages, no figure. v2: revised version. Section 3.1 and Appendix B
improved. The argument in Appendix A clarified. v3: References added. v4:
analysis on the black hole thermodynamical properties corrected. Final
version to appear in JHEP | JHEP 11 (2011) 15 | 10.1007/JHEP11(2011)015 | CECS-PHY-11/04 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an exact asymptotically Lifshitz black hole solution in
Brans-Dicke theory of gravity in arbitrary $n(\ge 3)$ dimensions in presence of
a power-law potential. In this solution, the dynamical exponent $z$ is
determined in terms of the Brans-Dicke parameter $\omega$ and $n$. Asymptotic
Lifshitz condition at ... | [
{
"created": "Fri, 6 May 2011 17:07:36 GMT",
"version": "v1"
},
{
"created": "Mon, 16 May 2011 17:32:23 GMT",
"version": "v2"
},
{
"created": "Wed, 18 May 2011 19:59:31 GMT",
"version": "v3"
},
{
"created": "Sun, 1 Jan 2012 22:22:58 GMT",
"version": "v4"
}
] | 2015-05-28 | [
[
"Maeda",
"Hideki",
""
],
[
"Giribet",
"Gaston",
""
]
] | We present an exact asymptotically Lifshitz black hole solution in Brans-Dicke theory of gravity in arbitrary $n(\ge 3)$ dimensions in presence of a power-law potential. In this solution, the dynamical exponent $z$ is determined in terms of the Brans-Dicke parameter $\omega$ and $n$. Asymptotic Lifshitz condition at in... |
1912.03654 | Julia Tchemarina | I.M. Potashov, Ju.V. Tchemarina and A.N. Tsirulev | Bound orbits near black holes with scalar hair | 6 pages, 2 figures, presented at the 4th International Conference on
Particle Physics and Astrophysics (ICPPA-2018) | IOP Conf. Series: Journal of Physics: Conf. Series 1390 (2019)
012097 | 10.1088/1742-6596/1390/1/012097 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We consider spherically symmetric black holes with minimally coupled scalar
fields and concentrate our attention on asymptotically flat self-gravitating
configurations having the event horizons located at radii much smaller than
$2m$. We think of such configurations as rigorous mathematical models of the
gravitating ... | [
{
"created": "Sun, 8 Dec 2019 11:02:50 GMT",
"version": "v1"
}
] | 2019-12-10 | [
[
"Potashov",
"I. M.",
""
],
[
"Tchemarina",
"Ju. V.",
""
],
[
"Tsirulev",
"A. N.",
""
]
] | We consider spherically symmetric black holes with minimally coupled scalar fields and concentrate our attention on asymptotically flat self-gravitating configurations having the event horizons located at radii much smaller than $2m$. We think of such configurations as rigorous mathematical models of the gravitating ob... |
1804.01876 | Patric H\"olscher | Chiara Caprini, Patric H\"olscher, Dominik J. Schwarz | Astrophysical Gravitational Waves in Conformal Gravity | v2: 21 pages, no figures; Uses REVTeX 4.1; added a comment and
references in section 1; corrected sign in eqn. (3) | Phys. Rev. D 98, 084002 (2018) | 10.1103/PhysRevD.98.084002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the gravitational radiation from binary systems in conformal
gravity (CG) and massive conformal gravity (MCG). CG might explain observed
galaxy rotation curves without dark matter, and both models are of interest in
the context of quantum gravity. Here we show that gravitational radiation
emitted by co... | [
{
"created": "Thu, 5 Apr 2018 14:29:15 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Apr 2018 08:40:32 GMT",
"version": "v2"
}
] | 2018-10-10 | [
[
"Caprini",
"Chiara",
""
],
[
"Hölscher",
"Patric",
""
],
[
"Schwarz",
"Dominik J.",
""
]
] | We investigate the gravitational radiation from binary systems in conformal gravity (CG) and massive conformal gravity (MCG). CG might explain observed galaxy rotation curves without dark matter, and both models are of interest in the context of quantum gravity. Here we show that gravitational radiation emitted by comp... |
0901.4708 | Mohammad Vahid Takook | F. Payandeh, M. Mehrafarin, M. V. Takook | One-loop approximation of Moller scattering in Krein-space quantization | 10 pages | Sci.China G52:212-217,2009 | 10.1007/s11433-009-0039-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been shown that the negative-norm states necessarily appear in a
covariant quantization of the free minimally coupled scalar field in de Sitter
spacetime [1,2]. In this processes ultraviolet and infrared divergences have
been automatically eliminated [3]. A natural renormalization of the one-loop
interacting q... | [
{
"created": "Thu, 29 Jan 2009 15:50:41 GMT",
"version": "v1"
}
] | 2009-04-13 | [
[
"Payandeh",
"F.",
""
],
[
"Mehrafarin",
"M.",
""
],
[
"Takook",
"M. V.",
""
]
] | It has been shown that the negative-norm states necessarily appear in a covariant quantization of the free minimally coupled scalar field in de Sitter spacetime [1,2]. In this processes ultraviolet and infrared divergences have been automatically eliminated [3]. A natural renormalization of the one-loop interacting qua... |
1809.00673 | Andrea Maselli | Vitor Cardoso, Gon\c{c}alo Castro, Andrea Maselli | Gravitational waves in massive gravity theories: waveforms, fluxes and
constraints from extreme-mass-ratio mergers | Important clarifications on screening and on our results added.
Accepted for publication in Physical Review Letters | Phys. Rev. Lett. 121, 251103 (2018) | 10.1103/PhysRevLett.121.251103 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Is the graviton massless? This problem was addressed in the literature at a
phenomenological level, using modified dispersion relations for gravitational
waves, in linearized calculations around flat space. Here, we perform a
detailed analysis of the gravitational waveform produced when a small particle
plunges or in... | [
{
"created": "Mon, 3 Sep 2018 18:00:17 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Sep 2018 09:26:14 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Nov 2018 19:00:16 GMT",
"version": "v3"
}
] | 2018-12-26 | [
[
"Cardoso",
"Vitor",
""
],
[
"Castro",
"Gonçalo",
""
],
[
"Maselli",
"Andrea",
""
]
] | Is the graviton massless? This problem was addressed in the literature at a phenomenological level, using modified dispersion relations for gravitational waves, in linearized calculations around flat space. Here, we perform a detailed analysis of the gravitational waveform produced when a small particle plunges or insp... |
gr-qc/0103070 | Robert R. Caldwell | Robert R. Caldwell and David Langlois | Shortcuts in the fifth dimension | 11 pages, 2 figures | Phys.Lett. B511 (2001) 129-135 | 10.1016/S0370-2693(01)00631-1 | null | gr-qc astro-ph hep-ph hep-th | null | If our Universe is a three-brane embedded in a five-dimensional anti-deSitter
spacetime, in which matter is confined to the brane and gravity inhabits an
infinite bulk space, then the causal propagation of luminous and gravitational
signals is in general different. A gravitational signal traveling between two
points ... | [
{
"created": "Mon, 19 Mar 2001 20:04:31 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Caldwell",
"Robert R.",
""
],
[
"Langlois",
"David",
""
]
] | If our Universe is a three-brane embedded in a five-dimensional anti-deSitter spacetime, in which matter is confined to the brane and gravity inhabits an infinite bulk space, then the causal propagation of luminous and gravitational signals is in general different. A gravitational signal traveling between two points on... |
gr-qc/0506087 | Jarmo M\"akel\"a Mr. | Jarmo Makela | Accelerating Observers, Area and Entropy | 7 pages, no figures | null | null | null | gr-qc | null | We consider an explicit example of a process, where the entropy carried by
radiation through an accelerating two-plane is proportional to the decrease in
the area of that two-plane even when the two-plane is not a part of any horizon
of spacetime. Our results seem to support the view that entropy proportional to
area... | [
{
"created": "Thu, 16 Jun 2005 12:52:24 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Makela",
"Jarmo",
""
]
] | We consider an explicit example of a process, where the entropy carried by radiation through an accelerating two-plane is proportional to the decrease in the area of that two-plane even when the two-plane is not a part of any horizon of spacetime. Our results seem to support the view that entropy proportional to area i... |
gr-qc/0311017 | Karl Martel | Karl Martel | Gravitational waveforms from a point particle orbiting a Schwarzschild
black hole | revtex4, 24 pages, 23 figures, 3 tables, submitted to PRD | Phys.Rev. D69 (2004) 044025 | 10.1103/PhysRevD.69.044025 | null | gr-qc | null | We numerically solve the inhomogeneous Zerilli-Moncrief and Regge-Wheeler
equations in the time domain. We obtain the gravitational waveforms produced by
a point-particle of mass $\mu$ traveling around a Schwarzschild black hole of
mass M on arbitrary bound and unbound orbits. Fluxes of energy and angular
momentum at... | [
{
"created": "Wed, 5 Nov 2003 18:29:10 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Martel",
"Karl",
""
]
] | We numerically solve the inhomogeneous Zerilli-Moncrief and Regge-Wheeler equations in the time domain. We obtain the gravitational waveforms produced by a point-particle of mass $\mu$ traveling around a Schwarzschild black hole of mass M on arbitrary bound and unbound orbits. Fluxes of energy and angular momentum at i... |
0712.2861 | Ramin Nowbakht Ghalati | R. N. Ghalati, D. G. C. McKeon | A Reexamination of the Canonical Structure of the Einstein-Hilbert
Action in First-Order Form | 26 pages | null | null | UWO-TH-07/19 | gr-qc | null | A canonical analysis of the Einstein-Hilbert action S_d (d>2) is considered,
using the first order form with the metric and affine connection as independent
fields. We adopt a conservative approach to using the Dirac constraint
formalism; we do not use equations of motion which are independent of time
derivatives and... | [
{
"created": "Tue, 18 Dec 2007 01:59:15 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Feb 2008 16:50:43 GMT",
"version": "v2"
},
{
"created": "Mon, 2 Jun 2008 15:04:19 GMT",
"version": "v3"
}
] | 2008-06-02 | [
[
"Ghalati",
"R. N.",
""
],
[
"McKeon",
"D. G. C.",
""
]
] | A canonical analysis of the Einstein-Hilbert action S_d (d>2) is considered, using the first order form with the metric and affine connection as independent fields. We adopt a conservative approach to using the Dirac constraint formalism; we do not use equations of motion which are independent of time derivatives and c... |
2102.13358 | Joan Josep Ferrando | Joan Josep Ferrando and Juan Antonio S\'aez | Dimension of the isometry group in three-dimensional Riemannian spaces | 8 pages, 1 figure | Class. Quantum Grav. 38 (2021) 067001 | 10.1088/1361-6382/abdaf4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The necessary and sufficient conditions for a three-dimensional Riemannian
metric to admit a group of isometries of dimension $r$ acting on s-dimensional
orbits are obtained. These conditions are Intrinsic, Deductive, Explicit and
ALgorithmic and they offer an IDEAL labeling that improves previously known
invariant s... | [
{
"created": "Fri, 26 Feb 2021 08:36:45 GMT",
"version": "v1"
}
] | 2021-03-01 | [
[
"Ferrando",
"Joan Josep",
""
],
[
"Sáez",
"Juan Antonio",
""
]
] | The necessary and sufficient conditions for a three-dimensional Riemannian metric to admit a group of isometries of dimension $r$ acting on s-dimensional orbits are obtained. These conditions are Intrinsic, Deductive, Explicit and ALgorithmic and they offer an IDEAL labeling that improves previously known invariant stu... |
gr-qc/9403035 | null | I. G. Avramidi | Covariant algebraic calculation of the one-loop effective potential in
non-Abelian gauge theory and a new approach to stability problem | 14 pages, LATeX, University of Greifswald (1994) | J.Math.Phys. 36 (1995) 1557-1571 | 10.1063/1.531139 | null | gr-qc hep-th | null | We use our recently proposed algebraic approach for calculating the heat
kernel associated with the Laplace operator to calculate the one-loop effective
action in the non-Abelian gauge theory. We consider the most general case of
arbitrary space-time dimension, arbitrary compact simple gauge group and
arbitrary matte... | [
{
"created": "Fri, 18 Mar 1994 15:47:46 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Avramidi",
"I. G.",
""
]
] | We use our recently proposed algebraic approach for calculating the heat kernel associated with the Laplace operator to calculate the one-loop effective action in the non-Abelian gauge theory. We consider the most general case of arbitrary space-time dimension, arbitrary compact simple gauge group and arbitrary matter ... |
1907.00295 | Madeleine Burkhart | Madeleine Burkhart and Daniel Pollack | Causal geodesic incompleteness of spacetimes arising from IMP gluing | null | null | 10.1007/s10714-019-2621-3 | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In 2002, Isenberg-Mazzeo-Pollack (IMP) constructed a series of vacuum initial
data sets via a gluing construction. In this paper, we investigate some local
geometry of these initial data sets as well as implications regarding their
spacetime developments. In particular, we state conditions for the existence of
outer ... | [
{
"created": "Sat, 29 Jun 2019 23:35:36 GMT",
"version": "v1"
}
] | 2020-01-08 | [
[
"Burkhart",
"Madeleine",
""
],
[
"Pollack",
"Daniel",
""
]
] | In 2002, Isenberg-Mazzeo-Pollack (IMP) constructed a series of vacuum initial data sets via a gluing construction. In this paper, we investigate some local geometry of these initial data sets as well as implications regarding their spacetime developments. In particular, we state conditions for the existence of outer tr... |
2012.11304 | Yong Cai | Yong Cai, Yun-Song Piao | Intermittent null energy condition violations during inflation and
primordial gravitational waves | 21 pages, 11 figures; v2, references added, updated to match
published version | Phys. Rev. D 103, 083521 (2021) | 10.1103/PhysRevD.103.083521 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | Primordial null energy condition (NEC) violation would imprint a blue-tilted
spectrum on gravitational wave background (GWB). However, its implications on
the GWB might be far richer than expected. We present a scenario, in which
after a slow-roll (NEC-preserving) inflation with Hubble parameter $H\simeq
H_{inf1}$, t... | [
{
"created": "Mon, 21 Dec 2020 13:16:46 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Apr 2021 05:53:45 GMT",
"version": "v2"
}
] | 2021-04-28 | [
[
"Cai",
"Yong",
""
],
[
"Piao",
"Yun-Song",
""
]
] | Primordial null energy condition (NEC) violation would imprint a blue-tilted spectrum on gravitational wave background (GWB). However, its implications on the GWB might be far richer than expected. We present a scenario, in which after a slow-roll (NEC-preserving) inflation with Hubble parameter $H\simeq H_{inf1}$, the... |
2006.12663 | Byon Jayawiguna | Byon N. Jayawiguna | Three Dimensional Black Hole in the Low Energy Heterotic String Theory | 8 pages, 2 figures, under review on Physics letter B Journal | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We study the BTZ black holes (2+1 dimensional space-time) in the low energy
heterotic string theory (BTZ-Sen BH). This concept requires us to include a
non-trivial dilaton $ \phi $ and a 3-form $ H_{\mu\nu\rho} $ field. By using
the Hassan-Sen transformation and BTZ black hole as a seed solution, we obtain
the soluti... | [
{
"created": "Mon, 22 Jun 2020 23:20:33 GMT",
"version": "v1"
}
] | 2020-06-24 | [
[
"Jayawiguna",
"Byon N.",
""
]
] | We study the BTZ black holes (2+1 dimensional space-time) in the low energy heterotic string theory (BTZ-Sen BH). This concept requires us to include a non-trivial dilaton $ \phi $ and a 3-form $ H_{\mu\nu\rho} $ field. By using the Hassan-Sen transformation and BTZ black hole as a seed solution, we obtain the solution... |
gr-qc/0003113 | Carsten Gundlach | David Garfinkle, Carsten Gundlach, James Isenberg and Niall OMurchadha | Existence, uniqueness and other properties of the BCT (minimal strain
lapse and shift) gauge | 5 pages, RevTex | Class.Quant.Grav. 17 (2000) 3899-3904 | 10.1088/0264-9381/17/18/321 | null | gr-qc | null | Brady, Creighton and Thorne have proposed a choice of the lapse and shift for
numerical evolutions in general relativity that extremizes a measure of the
rate of change of the three-metric (BCT gauge). We investigate existence and
uniqueness of this gauge, and comment on its use in numerical time evolutions.
| [
{
"created": "Fri, 31 Mar 2000 08:43:31 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Garfinkle",
"David",
""
],
[
"Gundlach",
"Carsten",
""
],
[
"Isenberg",
"James",
""
],
[
"OMurchadha",
"Niall",
""
]
] | Brady, Creighton and Thorne have proposed a choice of the lapse and shift for numerical evolutions in general relativity that extremizes a measure of the rate of change of the three-metric (BCT gauge). We investigate existence and uniqueness of this gauge, and comment on its use in numerical time evolutions. |
gr-qc/9911014 | Lawrence E. Kidder | Lawrence E. Kidder, Lee Samuel Finn | Spectral Methods for Numerical Relativity. The Initial Data Problem | 15 pages, 5 figures, revtex, submitted to PRD | Phys.Rev. D62 (2000) 084026 | 10.1103/PhysRevD.62.084026 | null | gr-qc | null | Numerical relativity has traditionally been pursued via finite differencing.
Here we explore pseudospectral collocation (PSC) as an alternative to finite
differencing, focusing particularly on the solution of the Hamiltonian
constraint (an elliptic partial differential equation) for a black hole
spacetime with angula... | [
{
"created": "Wed, 3 Nov 1999 22:21:42 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kidder",
"Lawrence E.",
""
],
[
"Finn",
"Lee Samuel",
""
]
] | Numerical relativity has traditionally been pursued via finite differencing. Here we explore pseudospectral collocation (PSC) as an alternative to finite differencing, focusing particularly on the solution of the Hamiltonian constraint (an elliptic partial differential equation) for a black hole spacetime with angular ... |
gr-qc/0012094 | Bob Laughlin | G. Chapline (Los Alamos), E. Hohlfeld, R. B. Laughlin, and D. I.
Santiago (Stanford University) | Quantum Phase Transitions and the Breakdown of Classical General
Relativity | 11 pages of RevTeX, 9 eps figures | Int.J.Mod.Phys. A18 (2003) 3587-3590 | 10.1142/S0217751X03016380 | null | gr-qc cond-mat | null | It is proposed that the event horizon of a black hole is a quantum phase
transition of the vacuum of space-time analogous to the liquid-vapor critical
point of a bose fluid. The equations of classical general relativity remain
valid arbitrarily close to the horizon yet fail there through the divergence of
a character... | [
{
"created": "Mon, 25 Dec 2000 19:32:07 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Chapline",
"G.",
"",
"Los Alamos"
],
[
"Hohlfeld",
"E.",
"",
"Stanford University"
],
[
"Laughlin",
"R. B.",
"",
"Stanford University"
],
[
"Santiago",
"D. I.",
"",
"Stanford University"
]
] | It is proposed that the event horizon of a black hole is a quantum phase transition of the vacuum of space-time analogous to the liquid-vapor critical point of a bose fluid. The equations of classical general relativity remain valid arbitrarily close to the horizon yet fail there through the divergence of a characteris... |
gr-qc/0701173 | Gil Jannes | C. Barcelo, A. Cano, L. J. Garay, G. Jannes | Quasi-normal mode analysis in BEC acoustic black holes | 7 pages, 3 figures | Phys.Rev.D75:084024,2007 | 10.1103/PhysRevD.75.084024 | null | gr-qc | null | We perform a quasi-normal mode analysis of black hole configurations in
Bose-Einstein condensates (BEC). In this analysis we use the full Bogoliubov
dispersion relation, not just the hydrodynamic or geometric approximation. We
restrict our attention to one-dimensional flows in BEC with step-like
discontinuities. For ... | [
{
"created": "Wed, 31 Jan 2007 12:17:43 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Barcelo",
"C.",
""
],
[
"Cano",
"A.",
""
],
[
"Garay",
"L. J.",
""
],
[
"Jannes",
"G.",
""
]
] | We perform a quasi-normal mode analysis of black hole configurations in Bose-Einstein condensates (BEC). In this analysis we use the full Bogoliubov dispersion relation, not just the hydrodynamic or geometric approximation. We restrict our attention to one-dimensional flows in BEC with step-like discontinuities. For th... |
gr-qc/0103061 | Nathaniel Obadia | N. Obadia and R. Parentani | Notes on moving mirrors | 27 pages and 2 figures LaTeX2e | Phys.Rev. D64 (2001) 044019 | 10.1103/PhysRevD.64.044019 | null | gr-qc hep-th | null | The Davies-Fulling (DF) model describes the scattering of a massless field by
a non-inertial mirror in two dimensions. In this paper, we generalize this
model in two different ways. First, we consider partially reflecting mirrors.
We show that the Bogoliubov coefficients relating inertial modes can be
expressed in te... | [
{
"created": "Fri, 16 Mar 2001 12:56:43 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Obadia",
"N.",
""
],
[
"Parentani",
"R.",
""
]
] | The Davies-Fulling (DF) model describes the scattering of a massless field by a non-inertial mirror in two dimensions. In this paper, we generalize this model in two different ways. First, we consider partially reflecting mirrors. We show that the Bogoliubov coefficients relating inertial modes can be expressed in term... |
2207.09458 | Seyed Hamid Reza Fazlollahi | H. R. Fazlollahi | Holographic Dark Energy from Acceleration of Particle Horizon | null | null | 10.1088/1674-1137/aca468 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Following the holographic principle, which suggests that the energy density
of dark energy may be proportional inversely to the area of the event horizon
of the Universe, we have proposed a new energy density of dark energy through
the acceleration of particle horizon scaled by the length of this parameter.
This mode... | [
{
"created": "Tue, 19 Jul 2022 14:20:39 GMT",
"version": "v1"
}
] | 2023-01-25 | [
[
"Fazlollahi",
"H. R.",
""
]
] | Following the holographic principle, which suggests that the energy density of dark energy may be proportional inversely to the area of the event horizon of the Universe, we have proposed a new energy density of dark energy through the acceleration of particle horizon scaled by the length of this parameter. This model ... |
0911.3862 | Roman Gold | Roman Gold, Bernd Bruegmann | Radiation from low-momentum zoom-whirl orbits | 9 pages, 6 figures, Amaldi8 conference proceedings as published | Class.Quant.Grav.27:084035,2010 | 10.1088/0264-9381/27/8/084035 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study zoom-whirl behaviour of equal mass, non-spinning black hole binaries
in full general relativity. The magnitude of the linear momentum of the initial
data is fixed to that of a quasi-circular orbit, and its direction is varied.
We find a global maximum in radiated energy for a configuration which completes
ro... | [
{
"created": "Thu, 19 Nov 2009 18:17:46 GMT",
"version": "v1"
},
{
"created": "Mon, 3 May 2010 14:05:15 GMT",
"version": "v2"
}
] | 2010-05-07 | [
[
"Gold",
"Roman",
""
],
[
"Bruegmann",
"Bernd",
""
]
] | We study zoom-whirl behaviour of equal mass, non-spinning black hole binaries in full general relativity. The magnitude of the linear momentum of the initial data is fixed to that of a quasi-circular orbit, and its direction is varied. We find a global maximum in radiated energy for a configuration which completes roug... |
0907.4528 | Khireddine Nouicer | Khireddine Nouicer | Entropy of cosmological black holes and generalized second law in
phantom energy-dominated universe | 20 pages, 5 figures, Major revision,Submitted to the IJMPD | Int.J.Mod.Phys.D20:233-252,2011 | 10.1142/S0218271811018743 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Adopting the thin-layer improved brick-wall method, we investigate the
thermodynamics of a black hole embedded in a spatially flat
Friedmann-Robertson-Walker universe. We calculate the temperature and the
entropy at every apparent horizon for arbitrary solution of the scale factor.
We show that the temperature and en... | [
{
"created": "Sun, 26 Jul 2009 23:07:56 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Apr 2010 12:37:24 GMT",
"version": "v2"
}
] | 2011-03-07 | [
[
"Nouicer",
"Khireddine",
""
]
] | Adopting the thin-layer improved brick-wall method, we investigate the thermodynamics of a black hole embedded in a spatially flat Friedmann-Robertson-Walker universe. We calculate the temperature and the entropy at every apparent horizon for arbitrary solution of the scale factor. We show that the temperature and entr... |
gr-qc/0607079 | Nicos Pelavas | A.A. Coley and N. Pelavas | Averaging in Spherically Symmetric Cosmology | null | Phys.Rev.D75:043506,2007 | 10.1103/PhysRevD.75.043506 | null | gr-qc astro-ph | null | In the macroscopic gravity approach to the averaging problem in cosmology,
the Einstein field equations on cosmological scales are modified by appropriate
gravitational correlation terms. We study the averaging problem within the
class of spherically symmetric cosmological models. That is, we shall take the
microscop... | [
{
"created": "Thu, 20 Jul 2006 13:15:41 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Sep 2006 16:12:46 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Feb 2007 04:12:54 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Coley",
"A. A.",
""
],
[
"Pelavas",
"N.",
""
]
] | In the macroscopic gravity approach to the averaging problem in cosmology, the Einstein field equations on cosmological scales are modified by appropriate gravitational correlation terms. We study the averaging problem within the class of spherically symmetric cosmological models. That is, we shall take the microscopic... |
gr-qc/9804073 | J. W. van Holten | D. v. Albada, W. v. Amersfoort, H. Boer Rookhuizen, J. Flokstra, G.
Frossati, H. v.d. Graaf, A. Heijboer, G. Heijboer, E. v.d. Heuvel, J.W. v.
Holten, G.J. Nooren, J. Oberski, H. Rogalla, A. de Waele, P. de Witt Huberts | GRAIL, an omni-directional gravitational wave detector | 5 pages, 4 figs., contribution to proceedings GW Data Analysis
Workshop, Paris, nov. 1997 | null | null | NIKHEF/98-009 | gr-qc | null | A cryogenic spherical and omni-directional resonant-mass detector proposed by
the GRAIL collaboration is described.
| [
{
"created": "Mon, 27 Apr 1998 13:32:45 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Albada",
"D. v.",
""
],
[
"Amersfoort",
"W. v.",
""
],
[
"Rookhuizen",
"H. Boer",
""
],
[
"Flokstra",
"J.",
""
],
[
"Frossati",
"G.",
""
],
[
"Graaf",
"H. v. d.",
""
],
[
"Heijboer",
"A.",
""
],
[
... | A cryogenic spherical and omni-directional resonant-mass detector proposed by the GRAIL collaboration is described. |
2204.05469 | Josue De-Santiago | Ruben Cordero, Josue De-Santiago, Omar G. Miranda, and Margarita
Serrano-Crivelli | Perturbations and stability conditions of k-essence and kinetic gravity
braiding models in two-field measure theory | 16 pages, 2 figures | Phys. Scr. 98 115242 (2023) | 10.1088/1402-4896/ad007a | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | We study cosmological perturbations for k-essence and kinetic gravity
braiding models in the context of the two-field measure theory (TMT).
Considering scalar perturbations and the uniform field gauge, we obtain the
sound speed of the fields and present a stability analysis by means of the
kinetic matrix and the mass... | [
{
"created": "Tue, 12 Apr 2022 01:41:09 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Oct 2022 02:29:07 GMT",
"version": "v2"
}
] | 2023-10-23 | [
[
"Cordero",
"Ruben",
""
],
[
"De-Santiago",
"Josue",
""
],
[
"Miranda",
"Omar G.",
""
],
[
"Serrano-Crivelli",
"Margarita",
""
]
] | We study cosmological perturbations for k-essence and kinetic gravity braiding models in the context of the two-field measure theory (TMT). Considering scalar perturbations and the uniform field gauge, we obtain the sound speed of the fields and present a stability analysis by means of the kinetic matrix and the mass e... |
1804.01419 | Gonzalo Garc\'ia-Reyes | Gonzalo Garc\'ia-Reyes | Exact relativistic models of conformastatic charged dust thick disks | 15 pages, 32 figures. Accepted for publication in Gen. Relativ.
Gravit | Gen. Relativ. Gravit. 50, 4, 1-16 (2018) | 10.1007/s10714-018-2366-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct relativistic models of charged dust thick disks for a particular
conformastatic spacetime through a Miyamoto-Nagai transformation used in
Newtonian gravity to model disk like galaxies. Two simple families of thick
disk models and a family of thick annular disks based on the field of an
extreme Reissner-N... | [
{
"created": "Wed, 4 Apr 2018 14:05:10 GMT",
"version": "v1"
}
] | 2018-05-10 | [
[
"García-Reyes",
"Gonzalo",
""
]
] | We construct relativistic models of charged dust thick disks for a particular conformastatic spacetime through a Miyamoto-Nagai transformation used in Newtonian gravity to model disk like galaxies. Two simple families of thick disk models and a family of thick annular disks based on the field of an extreme Reissner-Nor... |
1008.2540 | Przemyslaw Malkiewicz | Przemyslaw Malkiewicz | Quantization of FRW universe via gauge-fixed action | 15 pages, 2 figures, improved version, submitted for publication | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is devoted to investigation of the quantum
Friedman-Robertson-Walker universe with matter satisfying the equation of state
$p=w\rho$, where $w$ is an almost arbitrary constant. The procedure starts with
a reduced Lagrangian, which describes the system in a gauge fixed, so that the
evolution parameter corre... | [
{
"created": "Sun, 15 Aug 2010 18:13:03 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Sep 2010 10:34:27 GMT",
"version": "v2"
}
] | 2010-09-23 | [
[
"Malkiewicz",
"Przemyslaw",
""
]
] | This paper is devoted to investigation of the quantum Friedman-Robertson-Walker universe with matter satisfying the equation of state $p=w\rho$, where $w$ is an almost arbitrary constant. The procedure starts with a reduced Lagrangian, which describes the system in a gauge fixed, so that the evolution parameter corresp... |
0801.4645 | Andrzej Bialas | A.Bialas and W.Czyz | Renyi entropies of a black hole from Hawking radiation | 10 pages | Europhys.Lett.83:60009,2008 | 10.1209/0295-5075/83/60009 | null | gr-qc | null | Renyi entropies of a black hole are evaluated by counting the states of the
Hawking radiation which fills a thin shell surrounding the horizon. The width
of the shell is determined from its energy content and the corresponding mass
defect. The Bekenstein-Hawking formula for the entropy of the black hole is
correctly ... | [
{
"created": "Wed, 30 Jan 2008 11:00:32 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bialas",
"A.",
""
],
[
"Czyz",
"W.",
""
]
] | Renyi entropies of a black hole are evaluated by counting the states of the Hawking radiation which fills a thin shell surrounding the horizon. The width of the shell is determined from its energy content and the corresponding mass defect. The Bekenstein-Hawking formula for the entropy of the black hole is correctly re... |
1401.0181 | Tehani Finch | Tehani K. Finch | Painlev\'{e}-Gullstrand-type coordinates for the five-dimensional
Myers-Perry black hole | 15 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Painleve-Gullstrand coordinates provide a convenient framework for
presenting the Schwarzschild geometry because of their flat constant-time
hypersurfaces, and the fact that they are free of coordinate singularities
outside r=0. Generalizations of Painleve-Gullstrand coordinates suitable for
the Kerr geometry hav... | [
{
"created": "Tue, 31 Dec 2013 16:56:36 GMT",
"version": "v1"
}
] | 2014-01-03 | [
[
"Finch",
"Tehani K.",
""
]
] | The Painleve-Gullstrand coordinates provide a convenient framework for presenting the Schwarzschild geometry because of their flat constant-time hypersurfaces, and the fact that they are free of coordinate singularities outside r=0. Generalizations of Painleve-Gullstrand coordinates suitable for the Kerr geometry have ... |
1207.0671 | Andrea Dapor | Andrea Dapor, Jerzy Lewandowski, Yaser Tavakoli | Lorentz Symmetry in QFT on Quantum Bianchi I Space-Time | 14 pages, v3. Corrected a reference in the bibliography | Phys. Rev. D 86, 064013 (2012) | 10.1103/PhysRevD.86.064013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop the quantum theory of a scalar field on LQC Bianchi I geometry. In
particular, we focus on single modes of the field: the evolution equation is
derived from the quantum scalar constraint, and it is shown that the same
equation can be obtained from QFT on an "classical" effective geometry. We
investigate th... | [
{
"created": "Tue, 3 Jul 2012 13:34:11 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Sep 2012 14:11:27 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Oct 2012 09:58:39 GMT",
"version": "v3"
}
] | 2012-10-26 | [
[
"Dapor",
"Andrea",
""
],
[
"Lewandowski",
"Jerzy",
""
],
[
"Tavakoli",
"Yaser",
""
]
] | We develop the quantum theory of a scalar field on LQC Bianchi I geometry. In particular, we focus on single modes of the field: the evolution equation is derived from the quantum scalar constraint, and it is shown that the same equation can be obtained from QFT on an "classical" effective geometry. We investigate the ... |
gr-qc/0007021 | Robert M. Wald | Sijie Gao and Robert M. Wald | Theorems on gravitational time delay and related issues | 15 pages, 1 figure. Example of gauge perturbation changed/corrected.
Two footnotes added and one footnote removed | Class.Quant.Grav. 17 (2000) 4999-5008 | 10.1088/0264-9381/17/24/305 | null | gr-qc | null | Two theorems related to gravitational time delay are proven. Both theorems
apply to spacetimes satisfying the null energy condition and the null generic
condition. The first theorem states that if the spacetime is null geodesically
complete, then given any compact set $K$, there exists another compact set $K'$
such t... | [
{
"created": "Tue, 11 Jul 2000 15:12:16 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Jul 2000 22:10:54 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Gao",
"Sijie",
""
],
[
"Wald",
"Robert M.",
""
]
] | Two theorems related to gravitational time delay are proven. Both theorems apply to spacetimes satisfying the null energy condition and the null generic condition. The first theorem states that if the spacetime is null geodesically complete, then given any compact set $K$, there exists another compact set $K'$ such tha... |
gr-qc/0411137 | Peter Diener | Miguel Alcubierre, Bernd Bruegmann, Peter Diener, Frank Herrmann,
Denis Pollney, Edward Seidel, Ryoji Takahashi | Testing excision techniques for dynamical 3D black hole evolutions | REVTeX4, 8 pages, 9 figures | null | null | null | gr-qc | null | We perform both distorted black hole evolutions and binary black hole head on
collisions and compare the results of using a full grid to results obtained by
excising the black hole interiors. In both cases the evolutions are found to
run essentially indefinitely, and produce the same, convergent waveforms.
Further, s... | [
{
"created": "Mon, 29 Nov 2004 16:03:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Alcubierre",
"Miguel",
""
],
[
"Bruegmann",
"Bernd",
""
],
[
"Diener",
"Peter",
""
],
[
"Herrmann",
"Frank",
""
],
[
"Pollney",
"Denis",
""
],
[
"Seidel",
"Edward",
""
],
[
"Takahashi",
"Ryoji",
""
]
] | We perform both distorted black hole evolutions and binary black hole head on collisions and compare the results of using a full grid to results obtained by excising the black hole interiors. In both cases the evolutions are found to run essentially indefinitely, and produce the same, convergent waveforms. Further, sin... |
1307.6006 | Iver Brevik | I. Brevik, A. V. Timoshkin, Ye. Rabochaya and S. Zerbini | Turbulence Accelerating Cosmology from an Inhomogeneous Dark Fluid | 14 pages latex2e, no figures. To appear in Astrophys. Space Sci | Astrophysics and Space Science 347, 203 (2013) | 10.1007/s10509-013-1506-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Specific dark energy models with a linear inhomogeneous time-dependent
equation of state, within the framework of 4d Friedman-Robertson-Walker (FRW)
cosmology, are investigated. It is demonstrated that such 4d inhomogeneous
fluid models may lead to a turbulence FRW cosmology. Both one-component and
two-component mode... | [
{
"created": "Tue, 23 Jul 2013 10:01:27 GMT",
"version": "v1"
}
] | 2014-01-28 | [
[
"Brevik",
"I.",
""
],
[
"Timoshkin",
"A. V.",
""
],
[
"Rabochaya",
"Ye.",
""
],
[
"Zerbini",
"S.",
""
]
] | Specific dark energy models with a linear inhomogeneous time-dependent equation of state, within the framework of 4d Friedman-Robertson-Walker (FRW) cosmology, are investigated. It is demonstrated that such 4d inhomogeneous fluid models may lead to a turbulence FRW cosmology. Both one-component and two-component models... |
0812.4127 | Yousef Sobouti | Yousef Sobouti | Dark companion of baryonic matter in spliral galaxies | 3 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Flat or almost flat rotation curves of spiral galaxies can be explained by
logarithmic gravitational potentials. The field equations of GR admit of
spacetime metrics with such behaviors. The scenario can be interpreted either
as an alternative theory of gravitation or, equivalently, as a dark matter
paradigm. In the ... | [
{
"created": "Mon, 22 Dec 2008 09:07:56 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Mar 2009 10:57:17 GMT",
"version": "v2"
}
] | 2009-03-26 | [
[
"Sobouti",
"Yousef",
""
]
] | Flat or almost flat rotation curves of spiral galaxies can be explained by logarithmic gravitational potentials. The field equations of GR admit of spacetime metrics with such behaviors. The scenario can be interpreted either as an alternative theory of gravitation or, equivalently, as a dark matter paradigm. In the la... |
2012.05186 | Mohsen Khodadi | Mohsen Khodadi, Emmanuel N. Saridakis | Einstein-\AE ther Gravity in the light of Event Horizon Telescope
Observations of M87* | 29 pages, 10 figures. v2: discussion improved, figures and references
added, matches the version accepted for publication in "Physics of the Dark
Universe" | Phys.Dark Univ. 32 (2021) 100835 | 10.1016/j.dark.2021.100835 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate Einstein-\AE ther gravity in light of the recent Event Horizon
Telescope (EHT) observations of the M87*. The shape and size of the observed
black hole shadow contains information of the geometry in its vicinity, and
thus one can consider it as a potential probe to investigate different
gravitational th... | [
{
"created": "Wed, 9 Dec 2020 17:24:07 GMT",
"version": "v1"
},
{
"created": "Tue, 11 May 2021 17:16:33 GMT",
"version": "v2"
}
] | 2021-05-20 | [
[
"Khodadi",
"Mohsen",
""
],
[
"Saridakis",
"Emmanuel N.",
""
]
] | We investigate Einstein-\AE ther gravity in light of the recent Event Horizon Telescope (EHT) observations of the M87*. The shape and size of the observed black hole shadow contains information of the geometry in its vicinity, and thus one can consider it as a potential probe to investigate different gravitational theo... |
2306.06177 | Arnab Dhani | Arnab Dhani, David Radice, Jan Sch\"utte-Engel, Susan Gardner,
Bangalore Sathyaprakash, Domenico Logoteta, Albino Perego, Rahul Kashyap | Prospects for Direct Detection of Black Hole Formation in Neutron Star
Mergers with Next-Generation Gravitational-Wave Detectors | null | null | 10.1103/PhysRevD.109.044071 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | A direct detection of black hole formation in neutron star mergers would
provide invaluable information about matter in neutron star cores and finite
temperature effects on the nuclear equation of state. We study black hole
formation in neutron star mergers using a set of 190 numerical relativity
simulations consisti... | [
{
"created": "Fri, 9 Jun 2023 18:03:04 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Jun 2024 11:40:08 GMT",
"version": "v2"
}
] | 2024-07-03 | [
[
"Dhani",
"Arnab",
""
],
[
"Radice",
"David",
""
],
[
"Schütte-Engel",
"Jan",
""
],
[
"Gardner",
"Susan",
""
],
[
"Sathyaprakash",
"Bangalore",
""
],
[
"Logoteta",
"Domenico",
""
],
[
"Perego",
"Albino",
""
... | A direct detection of black hole formation in neutron star mergers would provide invaluable information about matter in neutron star cores and finite temperature effects on the nuclear equation of state. We study black hole formation in neutron star mergers using a set of 190 numerical relativity simulations consisting... |
1704.06524 | Antonio Sanchez Puente | Antonio Sanchez-Puente | Black Holes, Geons, and Singularities in Metric-Affine Gravity | PhD Dissertation, 196 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This thesis deals with the problem of singularities in a family of extensions
of General Relativity in the Metric-Affine formalism. I introduce the
Metric-Affine formalism as a framework in which study extensions of GR. I
review its features and motivate it through its application in Bravais
crystals, where ideal cry... | [
{
"created": "Fri, 21 Apr 2017 13:16:14 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jul 2017 09:44:17 GMT",
"version": "v2"
},
{
"created": "Fri, 21 Jul 2017 11:29:12 GMT",
"version": "v3"
}
] | 2017-07-24 | [
[
"Sanchez-Puente",
"Antonio",
""
]
] | This thesis deals with the problem of singularities in a family of extensions of General Relativity in the Metric-Affine formalism. I introduce the Metric-Affine formalism as a framework in which study extensions of GR. I review its features and motivate it through its application in Bravais crystals, where ideal cryst... |
2104.14453 | Pardyumn Kumar Sahoo | S. K. J. Pacif, Simran Arora, P.K. Sahoo | Late-time acceleration with a scalar field source: Observational
constraints and statefinder diagnostics | Physics of the Dark Universe published version | Phys. Dark Universe 32, 100804 (2021) | 10.1016/j.dark.2021.100804 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | This article discusses a dark energy cosmological model in the standard
theory of gravity - general relativity with a broad scalar field as a source.
Exact solutions of Einstein's field equations are derived by considering a
particular form of deceleration parameter $q$, which shows a smooth transition
from decelerat... | [
{
"created": "Fri, 2 Apr 2021 06:19:25 GMT",
"version": "v1"
}
] | 2022-08-23 | [
[
"Pacif",
"S. K. J.",
""
],
[
"Arora",
"Simran",
""
],
[
"Sahoo",
"P. K.",
""
]
] | This article discusses a dark energy cosmological model in the standard theory of gravity - general relativity with a broad scalar field as a source. Exact solutions of Einstein's field equations are derived by considering a particular form of deceleration parameter $q$, which shows a smooth transition from decelerated... |
2106.03150 | Masaya Amo | Masaya Amo, Keisuke Izumi, Yoshimune Tomikawa, Hirotaka Yoshino,
Tetsuya Shiromizu | Asymptotic behavior of null geodesics near future null infinity:
Significance of gravitational waves | 23 pages, published version, in v3 minor corrections | Phys. Rev. D 104, 064025 (2021) | 10.1103/PhysRevD.104.064025 | YITP-21-54, KOBE-COSMO-21-11, OCU-PHYS-541, AP-GR-169 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the behavior of null geodesics near future null infinity in
asymptotically flat spacetimes. In particular, we focus on the asymptotic
behavior of null geodesics that correspond to worldlines of photons initially
emitted in the directions tangential to the constant radial surfaces in the
Bondi coordinat... | [
{
"created": "Sun, 6 Jun 2021 15:10:00 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Jun 2021 05:42:09 GMT",
"version": "v2"
},
{
"created": "Fri, 10 Sep 2021 02:23:03 GMT",
"version": "v3"
}
] | 2021-09-13 | [
[
"Amo",
"Masaya",
""
],
[
"Izumi",
"Keisuke",
""
],
[
"Tomikawa",
"Yoshimune",
""
],
[
"Yoshino",
"Hirotaka",
""
],
[
"Shiromizu",
"Tetsuya",
""
]
] | We investigate the behavior of null geodesics near future null infinity in asymptotically flat spacetimes. In particular, we focus on the asymptotic behavior of null geodesics that correspond to worldlines of photons initially emitted in the directions tangential to the constant radial surfaces in the Bondi coordinates... |
2010.13693 | Brandon Mattingly | Brandon Mattingly, Abinash Kar, Matthew Gorban, William Julius, Cooper
Watson, MD Ali, Andrew Baas, Caleb Elmore, Jeff Lee, Bahram Shakerin, Eric
Davis, and Gerald Cleaver | Curvature Invariants for the Alcubierre and Nat\'ario Warp Drives | 41 Pages, 15 figures | Universe 2021, 7, 21 | 10.3390/universe7020021 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A process for using curvature invariants is applied to evaluate the metrics
for the Alcubierre and the Natario warp drives at a constant velocity.Curvature
invariants are independent of coordinate bases, so plotting these invariants
will be free of coordinate mapping distortions. As a consequence, they provide
a nove... | [
{
"created": "Mon, 26 Oct 2020 16:18:25 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jan 2021 22:12:17 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Apr 2021 15:17:28 GMT",
"version": "v3"
}
] | 2021-04-15 | [
[
"Mattingly",
"Brandon",
""
],
[
"Kar",
"Abinash",
""
],
[
"Gorban",
"Matthew",
""
],
[
"Julius",
"William",
""
],
[
"Watson",
"Cooper",
""
],
[
"Ali",
"MD",
""
],
[
"Baas",
"Andrew",
""
],
[
"Elmore... | A process for using curvature invariants is applied to evaluate the metrics for the Alcubierre and the Natario warp drives at a constant velocity.Curvature invariants are independent of coordinate bases, so plotting these invariants will be free of coordinate mapping distortions. As a consequence, they provide a novel ... |
1505.05980 | Yu-Hsiang Lin | Pisin Chen, Yu-Hsiang Lin | What initial condition of inflation would suppress the large-scale CMB
spectrum? | 17 pages, 17 figures; revised to address referee's comment, added
subsection III D and appendix with accompanying figures; matching
coefficients in subsection III D and appendix corrected, other minor
corrections and improvement, published in PRD | Phys. Rev. D 93, 023503 (2016) | 10.1103/PhysRevD.93.023503 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There is an apparent power deficit relative to the $\Lambda$CDM prediction of
the CMB spectrum at large scales, which, though not yet statistically
significant, persists from WMAP to Planck data. Proposals that invoke some form
of initial condition for the inflation have been made to address this apparent
power suppr... | [
{
"created": "Fri, 22 May 2015 08:10:27 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Sep 2015 19:44:12 GMT",
"version": "v2"
},
{
"created": "Fri, 8 Jan 2016 21:17:52 GMT",
"version": "v3"
}
] | 2016-01-12 | [
[
"Chen",
"Pisin",
""
],
[
"Lin",
"Yu-Hsiang",
""
]
] | There is an apparent power deficit relative to the $\Lambda$CDM prediction of the CMB spectrum at large scales, which, though not yet statistically significant, persists from WMAP to Planck data. Proposals that invoke some form of initial condition for the inflation have been made to address this apparent power suppres... |
1105.1091 | Surajit Chattopadhyay | Surajit Chattopadhyay (Pailan College of Management and Technology,
Kolkata) and Ujjal Debnath (Bengal Engineering and Science University,
Shibpur) | Emergent universe in chameleon, f(R) and f(T) gravity theories | International Journal of Modern Physics D, 2011 | Int.J.Mod.Phys.D20:1135-1152,2011 | 10.1142/S0218271811019293 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we consider an emergent universe in generalized gravity
theories like the chameleon, f(R) and f(T) gravities. We reconstruct the
potential of the chameleon field under the emergent scenario of the universe
and observe its increasing nature with the evolution of the universe. We reveal
that in the emerge... | [
{
"created": "Wed, 4 May 2011 08:50:55 GMT",
"version": "v1"
}
] | 2011-07-04 | [
[
"Chattopadhyay",
"Surajit",
"",
"Pailan College of Management and Technology,\n Kolkata"
],
[
"Debnath",
"Ujjal",
"",
"Bengal Engineering and Science University,\n Shibpur"
]
] | In this work, we consider an emergent universe in generalized gravity theories like the chameleon, f(R) and f(T) gravities. We reconstruct the potential of the chameleon field under the emergent scenario of the universe and observe its increasing nature with the evolution of the universe. We reveal that in the emergent... |
1908.04995 | Mustapha Azreg-A\"inou | Mustapha Azreg-A\"inou | Cylindrically symmetric static $n$-dimensional (un)charged (anti-)de
Sitter black holes in generic $f(T)$ gravity | 7 pages, 2 figures, extended version | Europhysics Letters (EPL) vol. 129 (2020) 20003 | 10.1209/0295-5075/129/20003 | null | gr-qc astro-ph.HE math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Given a generic function $f(T)$ we construct in closed forms cylindrically
symmetric static $n$-dimensional uncharged and charged de Sitter and anti-de
Sitter solutions (including black holes, wormholes and possibly other regular
solutions) in $f(T)$ gravity. Applications to some known models are considered.
| [
{
"created": "Wed, 14 Aug 2019 07:30:19 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Feb 2020 16:12:26 GMT",
"version": "v2"
}
] | 2020-02-18 | [
[
"Azreg-Aïnou",
"Mustapha",
""
]
] | Given a generic function $f(T)$ we construct in closed forms cylindrically symmetric static $n$-dimensional uncharged and charged de Sitter and anti-de Sitter solutions (including black holes, wormholes and possibly other regular solutions) in $f(T)$ gravity. Applications to some known models are considered. |
gr-qc/9807050 | Wang Bin | Bin Wang and Ru-Keng Su | Two kinds of extreme black holes and their classification | Latex version, to be published on Phys.Lett.B | Phys.Lett. B432 (1998) 69-73 | 10.1016/S0370-2693(98)00642-X | null | gr-qc | null | According to different topological configurations, we suggest that there are
two kinds of extreme black holes in the nature. We find that the Euler
characteristic plays an essential role to classify these two kinds of extreme
black holes. For the first kind of extreme black holes, Euler characteristic is
zero, and fo... | [
{
"created": "Sun, 19 Jul 1998 13:06:21 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Wang",
"Bin",
""
],
[
"Su",
"Ru-Keng",
""
]
] | According to different topological configurations, we suggest that there are two kinds of extreme black holes in the nature. We find that the Euler characteristic plays an essential role to classify these two kinds of extreme black holes. For the first kind of extreme black holes, Euler characteristic is zero, and for ... |
1909.02375 | Donato Bini | Donato Bini, Thibault Damour, Andrea Geralico | Novel approach to binary dynamics: application to the fifth
post-Newtonian level | 6 pages, 1 figure | Phys. Rev. Lett. 123, 231104 (2019) | 10.1103/PhysRevLett.123.231104 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a new methodology for deriving the conservative dynamics of
gravitationally interacting binary systems. Our approach combines, in a novel
way, several theoretical formalisms: post-Newtonian, post-Minkowskian,
multipolar-post-Minkowskian, gravitational self-force, and effective one-body.
We apply our meth... | [
{
"created": "Thu, 5 Sep 2019 12:59:56 GMT",
"version": "v1"
}
] | 2019-12-11 | [
[
"Bini",
"Donato",
""
],
[
"Damour",
"Thibault",
""
],
[
"Geralico",
"Andrea",
""
]
] | We introduce a new methodology for deriving the conservative dynamics of gravitationally interacting binary systems. Our approach combines, in a novel way, several theoretical formalisms: post-Newtonian, post-Minkowskian, multipolar-post-Minkowskian, gravitational self-force, and effective one-body. We apply our method... |
2112.07635 | Mark Ho-Yeuk Cheung | Simon M. C. Yeung, Mark H. Y. Cheung, Joseph A. J. Gais, Otto A.
Hannuksela, Tjonnie G. F. Li | Detectability of microlensed gravitational waves | 11 pages, 15 figures. Matches published version on MNRAS | Monthly Notices of the Royal Astronomical Society, Volume 526,
Issue 2, December 2023, Pages 2230-2240 | 10.1093/mnras/stad2772 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational lensing describes the bending of the trajectories of light and
gravitational waves due to the gravitational potential of a massive object.
Strong lensing by galaxies can create multiple images with different overall
amplifications, arrival times, and image types. If, furthermore, the
gravitational wave ... | [
{
"created": "Tue, 14 Dec 2021 18:26:58 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Feb 2024 23:20:15 GMT",
"version": "v2"
}
] | 2024-02-26 | [
[
"Yeung",
"Simon M. C.",
""
],
[
"Cheung",
"Mark H. Y.",
""
],
[
"Gais",
"Joseph A. J.",
""
],
[
"Hannuksela",
"Otto A.",
""
],
[
"Li",
"Tjonnie G. F.",
""
]
] | Gravitational lensing describes the bending of the trajectories of light and gravitational waves due to the gravitational potential of a massive object. Strong lensing by galaxies can create multiple images with different overall amplifications, arrival times, and image types. If, furthermore, the gravitational wave en... |
0903.3423 | Peter K.F. Kuhfittig | Peter K.F. Kuhfittig | Theoretical construction of stable traversable wormholes | 5 pages; 1 figure | Central Eur. J. Phys.8:364,2010 | 10.2478/s11534-009-0099-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown in this paper that it is possible, at least in principle, to
construct a traversable wormhole that is stable to linearized radial
perturbations by specifying relatively simple conditions on the shape and
redshift functions.
| [
{
"created": "Thu, 19 Mar 2009 20:57:27 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Jun 2010 20:52:44 GMT",
"version": "v2"
},
{
"created": "Mon, 28 Jan 2013 16:04:36 GMT",
"version": "v3"
}
] | 2013-01-29 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | It is shown in this paper that it is possible, at least in principle, to construct a traversable wormhole that is stable to linearized radial perturbations by specifying relatively simple conditions on the shape and redshift functions. |
1911.00881 | Peter K.F. Kuhfittig | Peter K.F. Kuhfittig and Vance D. Gladney | Seeking connections between wormholes, gravastars, and black holes via
noncommutative geometry | 9 pages, 1 figure; accepted by MPLA | null | 10.1142/S0217732320500595 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Noncommutative geometry, an offshoot of string theory, replaces point-like
objects by smeared objects. The resulting uncertainty may cause a black hole to
be observationally indistinguishable from a traversable wormhole, while the
latter, in turn, may become observationally indistinguishable from a gravastar.
The sam... | [
{
"created": "Sun, 3 Nov 2019 13:04:15 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Nov 2019 18:38:52 GMT",
"version": "v2"
}
] | 2020-04-15 | [
[
"Kuhfittig",
"Peter K. F.",
""
],
[
"Gladney",
"Vance D.",
""
]
] | Noncommutative geometry, an offshoot of string theory, replaces point-like objects by smeared objects. The resulting uncertainty may cause a black hole to be observationally indistinguishable from a traversable wormhole, while the latter, in turn, may become observationally indistinguishable from a gravastar. The same ... |
gr-qc/9403044 | null | Karl-Peter Marzlin | Fermi Coordinates for Weak Gravitational Fields | 7 Pages, Preprint KONS-RGKU-94-04, LaTeX | Phys.Rev. D50 (1994) 888-891 | 10.1103/PhysRevD.50.888 | null | gr-qc | null | A Reference is corrected. (We derive the Fermi coordinate system of an
observer in arbitrary motion in an arbitrary weak gravitational field valid to
all orders in the geodesic distance from the worldline of the observer. In flat
space-time this leads to a generalization of Rindler space for arbitrary
acceleration an... | [
{
"created": "Tue, 22 Mar 1994 11:24:09 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Mar 1994 12:33:07 GMT",
"version": "v2"
}
] | 2009-10-22 | [
[
"Marzlin",
"Karl-Peter",
""
]
] | A Reference is corrected. (We derive the Fermi coordinate system of an observer in arbitrary motion in an arbitrary weak gravitational field valid to all orders in the geodesic distance from the worldline of the observer. In flat space-time this leads to a generalization of Rindler space for arbitrary acceleration and ... |
2308.07963 | Nishita Jadoo | Nishita Jadoo, J. David Brown, Charles R. Evans | Extended body dynamics in general relativity: hyperelastic models | Corrected typos | Phys. Rev. D 108, 084020 (2023) | 10.1103/PhysRevD.108.084020 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We present a numerical framework for modeling extended hyperelastic bodies
based on a Lagrangian formulation of general relativistic elasticity theory. We
use finite element methods to discretize the body, then use the semi--discrete
action to derive ordinary differential equations of motion for the discrete
nodes. T... | [
{
"created": "Tue, 15 Aug 2023 18:01:26 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Oct 2023 16:54:11 GMT",
"version": "v2"
}
] | 2023-10-18 | [
[
"Jadoo",
"Nishita",
""
],
[
"Brown",
"J. David",
""
],
[
"Evans",
"Charles R.",
""
]
] | We present a numerical framework for modeling extended hyperelastic bodies based on a Lagrangian formulation of general relativistic elasticity theory. We use finite element methods to discretize the body, then use the semi--discrete action to derive ordinary differential equations of motion for the discrete nodes. The... |
0706.2072 | Iver Brevik | I. Brevik, E. Elizalde, O. Gorbunova, A. V. Timoshkin | A FRW Dark Fluid with a Non-Linear Inhomogeneous Equation of State | 11 pages pdf, 2 figures; to appear in Eur. Phys. J. C | Eur.Phys.J.C52:223-228,2007 | 10.1140/epjc/s10052-007-0357-9 | null | gr-qc | null | A dark Friedman-Robertson-Walker fluid governed by a non-linear inhomogeneous
equation of state is considered which can be viewed as a conveniently simple
paradigm for a whole class of models which exhibit phase transitions from a
non-phantom towards a phantom era (superacceleration transition). From another
side, su... | [
{
"created": "Thu, 14 Jun 2007 09:39:11 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Brevik",
"I.",
""
],
[
"Elizalde",
"E.",
""
],
[
"Gorbunova",
"O.",
""
],
[
"Timoshkin",
"A. V.",
""
]
] | A dark Friedman-Robertson-Walker fluid governed by a non-linear inhomogeneous equation of state is considered which can be viewed as a conveniently simple paradigm for a whole class of models which exhibit phase transitions from a non-phantom towards a phantom era (superacceleration transition). From another side, such... |
1312.5544 | Piotr Bizon | Piotr Bizo\'n | Is AdS stable? | invited review for GRG (based on my plenary lecture at GR20) | Gen. Rel. Grav. 46, 1724 (2014) | 10.1007/s10714-014-1724-0 | null | gr-qc hep-th math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has recently been conjectured that the Anti-de Sitter space is unstable
under arbitrarily small perturbations. This article (based on my plenary talk
of the same title at the conference GR20 in Warsaw) briefly reviews numerical
and analytical evidence supporting this conjecture, putting emphasis on weak
turbulence... | [
{
"created": "Thu, 19 Dec 2013 13:36:06 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Bizoń",
"Piotr",
""
]
] | It has recently been conjectured that the Anti-de Sitter space is unstable under arbitrarily small perturbations. This article (based on my plenary talk of the same title at the conference GR20 in Warsaw) briefly reviews numerical and analytical evidence supporting this conjecture, putting emphasis on weak turbulence a... |
1303.4083 | Mehedi Kalam | Mehedi Kalam, Nur Farhad and Sk. Monowar Hossein | Geodesic study of a charged black hole | 6 pages,6 figures | null | 10.1007/s10773-013-1814-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The behavior of the timelike and null geodesics of charged E.
Ay$\acute{o}$n-Beato and A. Garcia (ABG) black hole are investigated. For
circular and radial geodesics, we investigate all the possible motions by
plotting the effective potentials for different parameters. In conclusion, we
have shown that there is no ph... | [
{
"created": "Sun, 17 Mar 2013 18:09:14 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Kalam",
"Mehedi",
""
],
[
"Farhad",
"Nur",
""
],
[
"Hossein",
"Sk. Monowar",
""
]
] | The behavior of the timelike and null geodesics of charged E. Ay$\acute{o}$n-Beato and A. Garcia (ABG) black hole are investigated. For circular and radial geodesics, we investigate all the possible motions by plotting the effective potentials for different parameters. In conclusion, we have shown that there is no phen... |
gr-qc/9907072 | Robert Mann | I.S. Booth and R.B. Mann | Static and Infalling Quasilocal Energy of Charged and Naked Black Holes | 33 pages, 1 figure | Phys. Rev. D:124009, 1999 | 10.1103/PhysRevD.60.124009 | WATPHYS-TH99/04 | gr-qc | null | We extend the quasilocal formalism of Brown and York to include
electromagnetic and dilaton fields and also allow for spatial boundaries that
are not orthogonal to the foliation of the spacetime. The extension allows us
to study the quasilocal energy measured by observers who are moving around in a
spacetime. We show... | [
{
"created": "Thu, 22 Jul 1999 16:30:43 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Booth",
"I. S.",
""
],
[
"Mann",
"R. B.",
""
]
] | We extend the quasilocal formalism of Brown and York to include electromagnetic and dilaton fields and also allow for spatial boundaries that are not orthogonal to the foliation of the spacetime. The extension allows us to study the quasilocal energy measured by observers who are moving around in a spacetime. We show t... |
1507.05850 | Jan Harms | Jan Harms | Terrestrial Gravity Fluctuations | 151 pages, 52 figures; submitted to Living Reviews in Relativity | null | 10.1007/s41114-019-0022-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The article reviews the current state of the field, and also presents new
analyses especially with respect to the impact of seismic scattering on gravity
perturbations, active gravity noise cancellation, and time-domain models of
gravity perturbations from atmospheric and seismic point sources. Our
understanding of t... | [
{
"created": "Tue, 21 Jul 2015 14:26:54 GMT",
"version": "v1"
}
] | 2020-06-16 | [
[
"Harms",
"Jan",
""
]
] | The article reviews the current state of the field, and also presents new analyses especially with respect to the impact of seismic scattering on gravity perturbations, active gravity noise cancellation, and time-domain models of gravity perturbations from atmospheric and seismic point sources. Our understanding of ter... |
1704.05997 | Peng-Ming Zhang | P. M. Zhang, C. Duval, G. W. Gibbons, P. A. Horvathy | The Memory Effect for Plane Gravitational Waves | Thoroughly revised version. 11 pages, 4 figures | null | 10.1016/j.physletb.2017.07.050 | null | gr-qc astro-ph.HE hep-th math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | We give an account of the gravitational memory effect in the presence of the
exact plane wave solution of Einstein's vacuum equations. This allows an
elementary but exact description of the soft gravitons and how their presence
may be detected by observing the motion of freely falling particles. The
theorem of Bondi ... | [
{
"created": "Thu, 20 Apr 2017 03:56:28 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Jul 2017 08:24:18 GMT",
"version": "v2"
},
{
"created": "Thu, 20 Jul 2017 14:11:42 GMT",
"version": "v3"
},
{
"created": "Fri, 25 Aug 2017 02:52:59 GMT",
"version": "v4"
}
] | 2017-09-13 | [
[
"Zhang",
"P. M.",
""
],
[
"Duval",
"C.",
""
],
[
"Gibbons",
"G. W.",
""
],
[
"Horvathy",
"P. A.",
""
]
] | We give an account of the gravitational memory effect in the presence of the exact plane wave solution of Einstein's vacuum equations. This allows an elementary but exact description of the soft gravitons and how their presence may be detected by observing the motion of freely falling particles. The theorem of Bondi an... |
1001.0558 | Adrian Melissinos | Adrian Melissinos (for the LSC) | The effect of the Tides on the LIGO Interferometers | To appear in the Proceedings of the 12th Marcel Grossman Meeting,
Paris July 2009 | null | null | LIGO Document P0900257-v3 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present data on the modulation of the dark port power at the free spectral
range frequency of the LIGO 4 km interferometers. It is found that the power is
modulated exactly at the tidal frequencies to a precision of 6e-9 Hz.
| [
{
"created": "Mon, 4 Jan 2010 20:45:36 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Jan 2010 19:08:11 GMT",
"version": "v2"
}
] | 2010-01-05 | [
[
"Melissinos",
"Adrian",
"",
"for the LSC"
]
] | We present data on the modulation of the dark port power at the free spectral range frequency of the LIGO 4 km interferometers. It is found that the power is modulated exactly at the tidal frequencies to a precision of 6e-9 Hz. |
2112.05054 | Jun Zhang | Claudia de Rham, Andrew J. Tolley, Jun Zhang | Causality Constraints on Gravitational Effective Field Theories | 12 pages, 4 figures, typos corrected, constraints on the dim-6
operators updated | null | 10.1103/PhysRevLett.128.131102 | Imperial/TP/2021/CdR/4 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the effective field theory of gravity around black holes, and
show that the coefficients of the dimension-8 operators are tightly constrained
by causality considerations. Those constraints are consistent with -- but
tighter than -- previously derived causality and positivity bounds and imply
that the effe... | [
{
"created": "Thu, 9 Dec 2021 17:27:38 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Dec 2021 12:35:41 GMT",
"version": "v2"
},
{
"created": "Wed, 6 Apr 2022 08:37:03 GMT",
"version": "v3"
},
{
"created": "Fri, 19 Jan 2024 13:49:39 GMT",
"version": "v4"
}
] | 2024-01-22 | [
[
"de Rham",
"Claudia",
""
],
[
"Tolley",
"Andrew J.",
""
],
[
"Zhang",
"Jun",
""
]
] | We consider the effective field theory of gravity around black holes, and show that the coefficients of the dimension-8 operators are tightly constrained by causality considerations. Those constraints are consistent with -- but tighter than -- previously derived causality and positivity bounds and imply that the effect... |
gr-qc/0106085 | Omar E. Ortiz | Heinz-O. Kreiss and Omar E. Ortiz | Some Mathematical And Numerical Questions Connected With First And
Second Order Time Dependent Systems Of Partial Differential Equations | 12 pages, LaTeX; corrected typos and added reference | Lect.Notes Phys. 604 (2002) 359 | null | null | gr-qc | null | There is a tendency to write the equations of general relativity as a first
order symmetric system of time dependent partial differential equations.
However, for numerical reasons, it might be advantageous to use a second order
formulation like one obtained from the ADM equations. Unfortunately, the type
of the ADM e... | [
{
"created": "Tue, 26 Jun 2001 19:47:59 GMT",
"version": "v1"
},
{
"created": "Sat, 7 Jul 2001 17:27:46 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Kreiss",
"Heinz-O.",
""
],
[
"Ortiz",
"Omar E.",
""
]
] | There is a tendency to write the equations of general relativity as a first order symmetric system of time dependent partial differential equations. However, for numerical reasons, it might be advantageous to use a second order formulation like one obtained from the ADM equations. Unfortunately, the type of the ADM equ... |
gr-qc/9512032 | BoB | Roberto Casadio and Giovanni Venturi (Department of Physics University
of Bologna and Istituto Nazionale di Fisica Nucleare, Sezione di Bologna) | Semiclassical collapse of a sphere of dust | LaTeX, 25 pages, no figures, final version accepted for publication
in Class. and Quantum Grav | Class.Quant.Grav. 13 (1996) 2715-2734 | 10.1088/0264-9381/13/10/011 | null | gr-qc hep-th | null | The semiclassical collapse of a homogeneous sphere of dust is studied. After
identifying the independent dynamical variables, the system is canonically
quantised and coupled equations describing matter (dust) and gravitation are
obtained. The conditions for the validity of the adiabatic (Born--Oppenheimer)
and semicl... | [
{
"created": "Mon, 18 Dec 1995 09:28:14 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jul 1996 09:52:47 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Casadio",
"Roberto",
"",
"Department of Physics University\n of Bologna and Istituto Nazionale di Fisica Nucleare, Sezione di Bologna"
],
[
"Venturi",
"Giovanni",
"",
"Department of Physics University\n of Bologna and Istituto Nazionale di Fisica Nucleare, Sezione di Bologna... | The semiclassical collapse of a homogeneous sphere of dust is studied. After identifying the independent dynamical variables, the system is canonically quantised and coupled equations describing matter (dust) and gravitation are obtained. The conditions for the validity of the adiabatic (Born--Oppenheimer) and semiclas... |
1804.00249 | Yu Tian | Yu Tian | A topological charge of black holes | 8 pages, 1 table; v2: title changed from "The last (lost) charge of a
black hole" to "A topological charge of black holes", version published in
CQG | Class. Quantum Grav. 36 (2019) 245001 | 10.1088/1361-6382/ab5343 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The topological charge of a maximally symmetric black hole naturally arises
in holography, which can be viewed as the last charge of the black hole in the
sense that it together with all other known charges satisfies the holographic
Gibbs-Duhem-like relation as a completeness relation. It is then observed that
this t... | [
{
"created": "Sun, 1 Apr 2018 02:17:34 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Nov 2019 03:11:41 GMT",
"version": "v2"
}
] | 2019-11-28 | [
[
"Tian",
"Yu",
""
]
] | The topological charge of a maximally symmetric black hole naturally arises in holography, which can be viewed as the last charge of the black hole in the sense that it together with all other known charges satisfies the holographic Gibbs-Duhem-like relation as a completeness relation. It is then observed that this top... |
0906.3825 | Lukasz Glinka | Lukasz Andrzej Glinka | Novel Solution of Wheeler-DeWitt Theory | 20 pages | in L.A. Glinka (Ed.) "Towards New Cosmology From Quantum Gravity &
Particle Physics", Applied Mathematics and Physics, vol. 2, no. 3 (2014):
73-81 | 10.12691/amp-2-3-3 | null | gr-qc | http://creativecommons.org/licenses/by/3.0/ | Taking into account the global one-dimensionality conjecture recently
proposed by the author, the Cauchy-like analytical wave functional of the
Wheeler-DeWitt theory is derived. The crucial point of the integration strategy
is canceling of the singular behavior of the effective potential, which is
performed through t... | [
{
"created": "Sat, 20 Jun 2009 20:47:26 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Jun 2014 15:28:44 GMT",
"version": "v2"
}
] | 2014-06-11 | [
[
"Glinka",
"Lukasz Andrzej",
""
]
] | Taking into account the global one-dimensionality conjecture recently proposed by the author, the Cauchy-like analytical wave functional of the Wheeler-DeWitt theory is derived. The crucial point of the integration strategy is canceling of the singular behavior of the effective potential, which is performed through the... |
gr-qc/0207009 | Vitor Cardoso | Vitor Cardoso, Jose' P. S. Lemos | The radial infall of a highly relativistic point particle into a Kerr
black hole along the symmetry axis | 1 figure | Gen.Rel.Grav. 35 (2003) 327-333 | 10.1023/A:1022301412348 | null | gr-qc astro-ph hep-ph hep-th | null | In this Letter we consider the radial infall along the symmetry axis of an
ultra-relativistic point particle into a rotating Kerr black hole. We use the
Sasaki-Nakamura formalism to compute the waveform, energy spectra and total
energy radiated during this process. We discuss possible connections between
these result... | [
{
"created": "Mon, 1 Jul 2002 10:34:37 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Cardoso",
"Vitor",
""
],
[
"Lemos",
"Jose' P. S.",
""
]
] | In this Letter we consider the radial infall along the symmetry axis of an ultra-relativistic point particle into a rotating Kerr black hole. We use the Sasaki-Nakamura formalism to compute the waveform, energy spectra and total energy radiated during this process. We discuss possible connections between these results ... |
1911.01496 | Le\"ila Haegel | Le\"ila Haegel, Sascha Husa | Predicting the properties of black holes merger remnants with Deep
Neural Networks | 16 pages, 5 figures | Class.Quant.Grav. 37 (2020) 13, 135005 | 10.1088/1361-6382/ab905c | null | gr-qc stat.ML | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the first estimation of the mass and spin magnitude of Kerr black
holes resulting from the coalescence of binary black holes using a deep neural
network. The network is trained on a dataset containing 80\% of the full
publicly available catalog of numerical simulations of gravitational waves
emission by bi... | [
{
"created": "Mon, 4 Nov 2019 21:30:17 GMT",
"version": "v1"
},
{
"created": "Wed, 6 May 2020 09:09:18 GMT",
"version": "v2"
}
] | 2021-10-13 | [
[
"Haegel",
"Leïla",
""
],
[
"Husa",
"Sascha",
""
]
] | We present the first estimation of the mass and spin magnitude of Kerr black holes resulting from the coalescence of binary black holes using a deep neural network. The network is trained on a dataset containing 80\% of the full publicly available catalog of numerical simulations of gravitational waves emission by bina... |
2007.00580 | Philipp Hoehn | Philipp A. Hoehn, Alexander R. H. Smith and Maximilian P. E. Lock | Equivalence of approaches to relational quantum dynamics in relativistic
settings | 28+7 pages | Front. Phys. 9, 587083 (2021) | 10.3389/fphy.2021.587083 | null | gr-qc hep-th math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have previously shown (arXiv:1912.00033) that three approaches to
relational quantum dynamics -- relational Dirac observables, the Page-Wootters
formalism and quantum deparametrizations -- are equivalent. Here we show that
this `trinity' of relational quantum dynamics holds in relativistic settings
per frequency s... | [
{
"created": "Wed, 1 Jul 2020 16:12:24 GMT",
"version": "v1"
}
] | 2022-08-24 | [
[
"Hoehn",
"Philipp A.",
""
],
[
"Smith",
"Alexander R. H.",
""
],
[
"Lock",
"Maximilian P. E.",
""
]
] | We have previously shown (arXiv:1912.00033) that three approaches to relational quantum dynamics -- relational Dirac observables, the Page-Wootters formalism and quantum deparametrizations -- are equivalent. Here we show that this `trinity' of relational quantum dynamics holds in relativistic settings per frequency sup... |
gr-qc/0312015 | Ashutosh Mahajan | Ashutosh Mahajan, Rituparno Goswami, Pankaj S.Joshi | Gravitational collapse from smooth initial data with vanishing radial
pressure | 10 pages,3 figures,revtex4,Revised Version | Class.Quant.Grav. 22 (2005) 271-282 | 10.1088/0264-9381/22/2/002 | null | gr-qc | null | We study here the spherical gravitational collapse assuming initial data to
be necessarily smooth, as motivated by the requirements based on physical
reasonableness. A tangential pressure model is constructed and analyzed in
order to understand the final fate of collapse explicitly in terms of the
density and pressur... | [
{
"created": "Tue, 2 Dec 2003 12:00:28 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Dec 2004 15:22:37 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Mahajan",
"Ashutosh",
""
],
[
"Goswami",
"Rituparno",
""
],
[
"Joshi",
"Pankaj S.",
""
]
] | We study here the spherical gravitational collapse assuming initial data to be necessarily smooth, as motivated by the requirements based on physical reasonableness. A tangential pressure model is constructed and analyzed in order to understand the final fate of collapse explicitly in terms of the density and pressure ... |
gr-qc/0211017 | Miguel S\'anchez | A. M. Candela (1), J.L. Flores (2), Miguel Sanchez (2) ((1) Univ.
Bari, (2) Univ. Granada) | On General Plane Fronted Waves. Geodesics | Final version with minor errata corrected. 19 pages, Latex. To appear
in Gen. Relat. Gravit. (2003) | Gen.Rel.Grav. 35 (2003) 631-649 | 10.1023/A:1022962017685 | null | gr-qc math.DG | null | A general class of Lorentzian metrics, $M_0 x R^2$, $ds^2 = <.,.> + 2 du dv +
H(x,u) du^2$, with $(M_0, <.,.>$ any Riemannian manifold, is introduced in
order to generalize classical exact plane fronted waves. Here, we start a
systematic study of their main geodesic properties: geodesic completeness,
geodesic connect... | [
{
"created": "Tue, 5 Nov 2002 17:00:01 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Mar 2003 10:24:14 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Candela",
"A. M.",
""
],
[
"Flores",
"J. L.",
""
],
[
"Sanchez",
"Miguel",
""
]
] | A general class of Lorentzian metrics, $M_0 x R^2$, $ds^2 = <.,.> + 2 du dv + H(x,u) du^2$, with $(M_0, <.,.>$ any Riemannian manifold, is introduced in order to generalize classical exact plane fronted waves. Here, we start a systematic study of their main geodesic properties: geodesic completeness, geodesic connected... |
1401.8282 | Jong-Ping Hsu | Leonardo Hsu, Jong-Ping Hsu | Thim's Experiment and Exact Rotational Space-Time Transformations | 8 pages | Eur. Phys. J. Plus (2014) 129: 16 | 10.1140/epjp/i2014-14016-4 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Thim measured the transverse Doppler shift using a system consisting of a
stationary antenna and pickup, in addition to a number of intermediate antennas
mounted on the rim of a rotating disk. No such shift was detected, although the
experiment should have had enough sensitivity to measure it, as predicted by
the Lor... | [
{
"created": "Thu, 30 Jan 2014 14:51:15 GMT",
"version": "v1"
}
] | 2014-02-26 | [
[
"Hsu",
"Leonardo",
""
],
[
"Hsu",
"Jong-Ping",
""
]
] | Thim measured the transverse Doppler shift using a system consisting of a stationary antenna and pickup, in addition to a number of intermediate antennas mounted on the rim of a rotating disk. No such shift was detected, although the experiment should have had enough sensitivity to measure it, as predicted by the Loren... |
gr-qc/0610104 | Neven Bilic | Neven Bilic, Gary B. Tupper and Raoul D. Viollier | Chaplygin Gas Cosmology - Unification of Dark Matter and Dark Energy | 7 pages, presented by N. B. at IRGAC 2006, Barcelona, 11-15 July
2006, typos corrected, concluding paragraph slightly expanded, final version,
accepted in J. Phys. A, special issue | J.Phys.A40:6877-6882,2007 | 10.1088/1751-8113/40/25/S33 | null | gr-qc astro-ph hep-th | null | The models that unify dark matter and dark energy based upon the Chaplygin
gas fail owing to the suppression of structure formation by the adiabatic speed
of sound. Including string theory effects, in particular the Kalb-Ramond field,
we show how nonadiabatic perturbations allow a successful structure formation.
| [
{
"created": "Mon, 23 Oct 2006 14:58:17 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Dec 2006 10:10:51 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bilic",
"Neven",
""
],
[
"Tupper",
"Gary B.",
""
],
[
"Viollier",
"Raoul D.",
""
]
] | The models that unify dark matter and dark energy based upon the Chaplygin gas fail owing to the suppression of structure formation by the adiabatic speed of sound. Including string theory effects, in particular the Kalb-Ramond field, we show how nonadiabatic perturbations allow a successful structure formation. |
gr-qc/0512054 | Sa\v{s}a Iliji\'c | Dubravko Horvat, Sasa Ilijic | Regular and singular solutions for charged dust distributions in the
Einstein--Maxwell theory | LaTeX/RevTeX, 7 pages 2 figures, changes wrt v1: results unchanged
but discussion considerably extended and several references added | Can. J. Phys. 85 (2007) 957-965 | 10.1139/P07-090 | null | gr-qc | null | Solutions for the static spherically symmetric extremally charged dust in the
Majumdar--Papapetrou system have been found. For a certain amount of the
allocated mass/charge, the solutions have singularities of a type which could
render them physically unacceptable, since the corresponding physically
relevant quantiti... | [
{
"created": "Thu, 8 Dec 2005 19:50:30 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Sep 2007 07:12:53 GMT",
"version": "v2"
}
] | 2011-11-09 | [
[
"Horvat",
"Dubravko",
""
],
[
"Ilijic",
"Sasa",
""
]
] | Solutions for the static spherically symmetric extremally charged dust in the Majumdar--Papapetrou system have been found. For a certain amount of the allocated mass/charge, the solutions have singularities of a type which could render them physically unacceptable, since the corresponding physically relevant quantities... |
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