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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2012.12355 | Fay\c{c}al Hammad | F. Hammad, P. Sadeghi, N. Fleury, A. Leblanc | What can we learn from the conformal noninvariance of the Klein-Gordon
equation? | Length reduced, typos corrected, references added, main results
emphasized. Accepted in IJMPA | Int. J. Mod. Phys. A 36, 2150224 (2021) | 10.1142/S0217751X21502249 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that the Klein-Gordon equation in curved spacetime is
conformally noninvariant, both with and without a mass term. We show that such
a noninvariance provides nontrivial physical insights at different levels,
first within the fully relativistic regime, then in the nonrelativistic regime
leading to the... | [
{
"created": "Tue, 22 Dec 2020 21:09:20 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Nov 2021 12:09:59 GMT",
"version": "v2"
}
] | 2021-12-16 | [
[
"Hammad",
"F.",
""
],
[
"Sadeghi",
"P.",
""
],
[
"Fleury",
"N.",
""
],
[
"Leblanc",
"A.",
""
]
] | It is well known that the Klein-Gordon equation in curved spacetime is conformally noninvariant, both with and without a mass term. We show that such a noninvariance provides nontrivial physical insights at different levels, first within the fully relativistic regime, then in the nonrelativistic regime leading to the S... |
gr-qc/9807062 | Mark E. Rupright | James W. York, Jr | Causal Propagation of Constraints and the Canonical Form of General
Relativity | 9 pages, no figures, Latex | null | null | IFP-UNC-525 | gr-qc | null | Studies of new hyperbolic systems for the Einstein evolution equations show
that the ``slicing density'' $\alpha(t,x)$ can be freely specified while the
lapse $N = \alpha g^{1/2}$ cannot. Implementation of this small change in the
Arnowitt-Deser-Misner action principle leads to canonical equations that agree
with the... | [
{
"created": "Wed, 22 Jul 1998 17:10:19 GMT",
"version": "v1"
}
] | 2012-08-27 | [
[
"York,",
"James W.",
"Jr"
]
] | Studies of new hyperbolic systems for the Einstein evolution equations show that the ``slicing density'' $\alpha(t,x)$ can be freely specified while the lapse $N = \alpha g^{1/2}$ cannot. Implementation of this small change in the Arnowitt-Deser-Misner action principle leads to canonical equations that agree with the E... |
gr-qc/0109011 | Fredrik Stahl | Fredrik St{\aa}hl | Fuchsian analysis of S^2xS^1 and S^3 Gowdy spacetimes | LaTeX 2e, AMSLaTeX, a4wide, 25 pages | Class.Quant.Grav.19:4483-4504,2002 | 10.1088/0264-9381/19/17/301 | AEI-2001-110 | gr-qc | null | The Gowdy spacetimes are vacuum solutions of Einstein's equations with two
commuting Killing vectors having compact spacelike orbits with T^3, S^2xS^1 or
S^3 topology. In the case of T^3 topology, Kichenassamy and Rendall have found
a family of singular solutions which are asymptotically velocity dominated by
constru... | [
{
"created": "Tue, 4 Sep 2001 13:46:17 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Ståhl",
"Fredrik",
""
]
] | The Gowdy spacetimes are vacuum solutions of Einstein's equations with two commuting Killing vectors having compact spacelike orbits with T^3, S^2xS^1 or S^3 topology. In the case of T^3 topology, Kichenassamy and Rendall have found a family of singular solutions which are asymptotically velocity dominated by construct... |
1209.6148 | George Pappas | George Pappas and Theocharis A. Apostolatos | An all-purpose metric for the exterior of any kind of rotating neutron
star | Additional material can be found at
http://users.uoa.gr/~gpappas/MNRAS/neutron_stars_spacetime.html | Mon. Not. R. Astron. Soc. 429, 3007-3024 (2013) | 10.1093/mnras/sts556 | null | gr-qc astro-ph.HE astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have tested the appropriateness of two-soliton analytic metric to describe
the exterior of all types of neutron stars, no matter what their equation of
state or rotation rate is. The particular analytic solution of the vaccuum
Einstein equations proved quite adjustable to mimic the metric functions of all
numerica... | [
{
"created": "Thu, 27 Sep 2012 07:39:10 GMT",
"version": "v1"
}
] | 2013-02-12 | [
[
"Pappas",
"George",
""
],
[
"Apostolatos",
"Theocharis A.",
""
]
] | We have tested the appropriateness of two-soliton analytic metric to describe the exterior of all types of neutron stars, no matter what their equation of state or rotation rate is. The particular analytic solution of the vaccuum Einstein equations proved quite adjustable to mimic the metric functions of all numericall... |
2407.21108 | Ian Newsome | Ian M. Newsome, Silvia Pla, and Paul R. Anderson | Quantum Effects in 3+1 Schwarzschild-de Sitter Spacetime: Properties of
the Hadamard Function | 22 pages, 7 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a four-dimensional Schwarzschild-de Sitter background, the spherically
symmetric ($\ell=0$) contribution to the Hadamard two-point correlation
function is computed for a massless minimally-coupled scalar field in the Unruh
state. Consideration is given to spacetime points located exterior to the black
hole horizon... | [
{
"created": "Tue, 30 Jul 2024 18:01:07 GMT",
"version": "v1"
}
] | 2024-08-01 | [
[
"Newsome",
"Ian M.",
""
],
[
"Pla",
"Silvia",
""
],
[
"Anderson",
"Paul R.",
""
]
] | In a four-dimensional Schwarzschild-de Sitter background, the spherically symmetric ($\ell=0$) contribution to the Hadamard two-point correlation function is computed for a massless minimally-coupled scalar field in the Unruh state. Consideration is given to spacetime points located exterior to the black hole horizon, ... |
gr-qc/9804057 | Jolien Creighton | Patrick R. Brady, Jolien D. E. Creighton, and Kip S. Thorne | Computing the merger of black-hole binaries: the IBBH problem | 6 pages RevTeX | Phys.Rev.D58:061501,1998 | 10.1103/PhysRevD.58.061501 | GRP-498 | gr-qc | null | Gravitational radiation arising from the inspiral and merger of binary black
holes (BBH's) is a promising candidate for detection by kilometer-scale
interferometric gravitational wave observatories. This paper discusses a
serious obstacle to searches for such radiation and to the interpretation of
any observed waves:... | [
{
"created": "Wed, 22 Apr 1998 17:35:46 GMT",
"version": "v1"
}
] | 2009-12-30 | [
[
"Brady",
"Patrick R.",
""
],
[
"Creighton",
"Jolien D. E.",
""
],
[
"Thorne",
"Kip S.",
""
]
] | Gravitational radiation arising from the inspiral and merger of binary black holes (BBH's) is a promising candidate for detection by kilometer-scale interferometric gravitational wave observatories. This paper discusses a serious obstacle to searches for such radiation and to the interpretation of any observed waves: t... |
2107.08893 | Enrique Alvarez | Enrique \'Alvarez and Jes\'us Anero | Some comments on the Hamiltonian for Unimodular Gravity | 28 pages | null | 10.1103/PhysRevD.104.084096 | IFT-UAM/CSIC-21-84 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several alternative formulations of the first order approach to unimodular
gravity are presented. There is always a particular one such that it is {\em
classically} equivalent to the second order formulation; this we call {\em
educated}. It is often at variance with the {\em naive} approach, in which the
lagrangian i... | [
{
"created": "Mon, 19 Jul 2021 14:07:27 GMT",
"version": "v1"
}
] | 2021-11-10 | [
[
"Álvarez",
"Enrique",
""
],
[
"Anero",
"Jesús",
""
]
] | Several alternative formulations of the first order approach to unimodular gravity are presented. There is always a particular one such that it is {\em classically} equivalent to the second order formulation; this we call {\em educated}. It is often at variance with the {\em naive} approach, in which the lagrangian is ... |
1407.1698 | Yan-Gang Miao | Yan-Gang Miao, Fang-Fang Yuan, Zheng-Zheng Zhang | Thermodynamic approach to field equations in Lovelock gravity and f(R)
gravity revisited | 10 pages, no figures; v2: clarifications and references added, to
appear in Int. J. Mod. Phys. D | Int. J. Mod. Phys. D 23 (2014) 1450093 | 10.1142/S021827181450093X | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The first law of thermodynamics at black hole horizons is known to be
obtainable from the gravitational field equations. A recent study claims that
the contributions at inner horizons should be considered in order to give the
conventional first law of black hole thermodynamics. Following this method, we
revisit the t... | [
{
"created": "Mon, 7 Jul 2014 13:00:24 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Sep 2014 16:13:41 GMT",
"version": "v2"
}
] | 2014-10-20 | [
[
"Miao",
"Yan-Gang",
""
],
[
"Yuan",
"Fang-Fang",
""
],
[
"Zhang",
"Zheng-Zheng",
""
]
] | The first law of thermodynamics at black hole horizons is known to be obtainable from the gravitational field equations. A recent study claims that the contributions at inner horizons should be considered in order to give the conventional first law of black hole thermodynamics. Following this method, we revisit the the... |
2001.00551 | Shahram Jalalzadeh | S. Jalalzadeh and A. J. S. Capistrano | Bohmian mechanics of Klein-Gordon equation via quantum metric and mass | 7 pages | Modern Physics Letters A, 34 (2019) 1950270 | 10.1142/S0217732319502705 | null | gr-qc math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The causal stochastic interpretation of relativistic quantum mechanics has
the problems of superluminal velocities, motion backward in time and the
incorrect non-relativistic limit. In this paper, according to the original
ideas of de Broglie, Bohm and Takabayasi, we have introduced simultaneous
quantum mass and quan... | [
{
"created": "Thu, 2 Jan 2020 18:19:17 GMT",
"version": "v1"
}
] | 2020-01-03 | [
[
"Jalalzadeh",
"S.",
""
],
[
"Capistrano",
"A. J. S.",
""
]
] | The causal stochastic interpretation of relativistic quantum mechanics has the problems of superluminal velocities, motion backward in time and the incorrect non-relativistic limit. In this paper, according to the original ideas of de Broglie, Bohm and Takabayasi, we have introduced simultaneous quantum mass and quantu... |
gr-qc/9404021 | Todd Brun | Todd A. Brun (Department of Physics, Caltech) | The Decoherence of Phase Space Histories | 20 pages (RevTex 3.0 macros) | null | null | Caltech preprint CALT-68-1929 (Corrected the preprint code) | gr-qc hep-th | null | In choosing a family of histories for a system, it is often convenient to
choose a succession of locations in phase space, rather than configuration
space, for comparison to classical histories. Although there are no good
projections onto phase space, several approximate projections have been used in
the past; three ... | [
{
"created": "Tue, 12 Apr 1994 08:41:42 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Apr 1994 09:30:47 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Brun",
"Todd A.",
"",
"Department of Physics, Caltech"
]
] | In choosing a family of histories for a system, it is often convenient to choose a succession of locations in phase space, rather than configuration space, for comparison to classical histories. Although there are no good projections onto phase space, several approximate projections have been used in the past; three of... |
2207.05965 | Muhammad Zaeem-Ul-Haq Bhatti | M. Z. Bhatti, Z. Yousaf and M. Yousaf | Junction conditions in perfect fluid $f(\mathcal{G},~T)$ gravitational
theory | 27 pages, 1 figure, version submitted for publication | null | null | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This manuscript aims to establish the gravitational junction conditions(JCs)
for the $f(\mathcal{G},~T)$ gravity. In this gravitational theory, $f$ is an
arbitrary function of Gauss-Bonnet invariant $\mathcal{G}$ and the trace of the
energy-momentum tensor $T_{\mu\nu}$ i.e., $T$. We start by introducing this
gravity ... | [
{
"created": "Wed, 13 Jul 2022 05:08:24 GMT",
"version": "v1"
}
] | 2022-07-14 | [
[
"Bhatti",
"M. Z.",
""
],
[
"Yousaf",
"Z.",
""
],
[
"Yousaf",
"M.",
""
]
] | This manuscript aims to establish the gravitational junction conditions(JCs) for the $f(\mathcal{G},~T)$ gravity. In this gravitational theory, $f$ is an arbitrary function of Gauss-Bonnet invariant $\mathcal{G}$ and the trace of the energy-momentum tensor $T_{\mu\nu}$ i.e., $T$. We start by introducing this gravity th... |
gr-qc/0608115 | Evgeny Sorkin | Evgeny Sorkin | Nonuniform black strings in various dimensions | 32pp, 17 figs. v2: minor corrections to match the published version | Phys.Rev.D74:104027,2006 | 10.1103/PhysRevD.74.104027 | null | gr-qc hep-th | null | The nonuniform black strings branch, which emerges from the critical
Gregory-Laflamme string, is numerically constructed in dimensions 6 <= D <= 11
and extended into the strongly non-linear regime. All the solutions are more
massive and less entropic than the marginal string. We find the asymptotic
values of the mass... | [
{
"created": "Sat, 26 Aug 2006 17:25:57 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Nov 2006 17:59:17 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Sorkin",
"Evgeny",
""
]
] | The nonuniform black strings branch, which emerges from the critical Gregory-Laflamme string, is numerically constructed in dimensions 6 <= D <= 11 and extended into the strongly non-linear regime. All the solutions are more massive and less entropic than the marginal string. We find the asymptotic values of the mass, ... |
1810.07296 | Reinaldo Gleiser | Reinaldo J. Gleiser | Linear stability of the Linet - Tian solution with positive cosmological
constant | One reference added. Several typos corrected | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The purpose of this paper is to extend the analysis of gravitational
instability of the Linet - Tian solution to the case $\Lambda > 0$. A
fundamental difference brought about by $\Lambda >0$, as compared to
$\Lambda<0$ is in the structure of the resulting space time. Associated with
each of the two commuting Killing... | [
{
"created": "Tue, 16 Oct 2018 22:10:32 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Nov 2018 22:06:10 GMT",
"version": "v2"
}
] | 2018-11-07 | [
[
"Gleiser",
"Reinaldo J.",
""
]
] | The purpose of this paper is to extend the analysis of gravitational instability of the Linet - Tian solution to the case $\Lambda > 0$. A fundamental difference brought about by $\Lambda >0$, as compared to $\Lambda<0$ is in the structure of the resulting space time. Associated with each of the two commuting Killing v... |
1210.4504 | Emanuele Alesci | Emanuele Alesci and Francesco Cianfrani | A new perspective on cosmology in Loop Quantum Gravity | 5 pages | null | 10.1209/0295-5075/104/10001 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new cosmological model derived from Loop Quantum Gravity. The
formulation is based on a projection of the kinematical Hilbert space of the
full theory down to a subspace representing the proper arena for an
inhomogeneous Bianchi I model. This procedure gives a direct link between the
full theory and its ... | [
{
"created": "Tue, 16 Oct 2012 17:24:22 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Alesci",
"Emanuele",
""
],
[
"Cianfrani",
"Francesco",
""
]
] | We present a new cosmological model derived from Loop Quantum Gravity. The formulation is based on a projection of the kinematical Hilbert space of the full theory down to a subspace representing the proper arena for an inhomogeneous Bianchi I model. This procedure gives a direct link between the full theory and its co... |
2007.04153 | Carlos A. R. Herdeiro | Dumitru Astefanesei, Carlos Herdeiro, Jo\~ao Oliveira and Eugen Radu | Higher dimensional black hole scalarization | 15 pages, 4 figures | null | 10.1007/JHEP09(2020)186 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the simplest scalar-tensor theories, wherein the scalar field is
non-minimally coupled to the Ricci scalar, spontaneous scalarization of
electrovacuum black holes (BHs) does not occur. This ceases to be true in
higher dimensional spacetimes, $d>4$. We consider the scalarization of the
higher dimensional Reissner-N... | [
{
"created": "Wed, 8 Jul 2020 14:30:15 GMT",
"version": "v1"
}
] | 2020-10-28 | [
[
"Astefanesei",
"Dumitru",
""
],
[
"Herdeiro",
"Carlos",
""
],
[
"Oliveira",
"João",
""
],
[
"Radu",
"Eugen",
""
]
] | In the simplest scalar-tensor theories, wherein the scalar field is non-minimally coupled to the Ricci scalar, spontaneous scalarization of electrovacuum black holes (BHs) does not occur. This ceases to be true in higher dimensional spacetimes, $d>4$. We consider the scalarization of the higher dimensional Reissner-Nor... |
gr-qc/0604103 | Brian Edgar | S. Brian Edgar and M.P. Machado Ramos | Obtaining a class of Type O pure radiation metrics with a cosmological
constant, using invariant operators | 29 pages | Gen.Rel.Grav.39:539-566,2007 | 10.1007/s10714-006-0392-0 | null | gr-qc | null | Using the generalised invariant formalism we derive a class of conformally
flat spacetimes whose Ricci tensor has a pure radiation and a Ricci scalar
component. The method used is a development of the methods used earlier for
pure radiation spacetimes of Petrov types O and N respectively. In this paper
we demonstrate... | [
{
"created": "Mon, 24 Apr 2006 15:25:25 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Edgar",
"S. Brian",
""
],
[
"Ramos",
"M. P. Machado",
""
]
] | Using the generalised invariant formalism we derive a class of conformally flat spacetimes whose Ricci tensor has a pure radiation and a Ricci scalar component. The method used is a development of the methods used earlier for pure radiation spacetimes of Petrov types O and N respectively. In this paper we demonstrate h... |
1504.00295 | Lavinia Heisenberg | Jose Beltr\'an Jim\'enez, Lavinia Heisenberg and Gonzalo J. Olmo | Tensor perturbations in a general class of Palatini theories | 9 pages, Journal version | null | 10.1088/1475-7516/2015/06/026 | NORDITA-2015-36, IFIC/15-59 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a general class of gravitational theories formulated in the Palatini
approach and derive the equations governing the evolution of tensor
perturbations. In the absence of torsion, the connection can be solved as the
Christoffel symbols of an auxiliary metric which is non-trivially related to
the space-time me... | [
{
"created": "Wed, 1 Apr 2015 17:04:54 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Sep 2015 08:45:19 GMT",
"version": "v2"
}
] | 2015-09-30 | [
[
"Jiménez",
"Jose Beltrán",
""
],
[
"Heisenberg",
"Lavinia",
""
],
[
"Olmo",
"Gonzalo J.",
""
]
] | We study a general class of gravitational theories formulated in the Palatini approach and derive the equations governing the evolution of tensor perturbations. In the absence of torsion, the connection can be solved as the Christoffel symbols of an auxiliary metric which is non-trivially related to the space-time metr... |
gr-qc/0304060 | Farid Ya. Khalili | F.Ya.Khalili | Low pumping energy mode of the "optical bars''/"optical lever"
topologies of gravitational-wave antennae | 18 pages, 5 figures | Phys.Lett.A317:169-180,2003 | 10.1016/S0375-9601(03)01136-8 | null | gr-qc | null | The ``optical bars''/``optical lever'' topologies of gravitational-wave
antennae allow to obtain sensitivity better that the Standard Quantum Limit
while keeping the optical pumping energy in the antenna relatively low. Element
of the crucial importance in these schemes is the local meter which monitors
the local tes... | [
{
"created": "Wed, 16 Apr 2003 07:57:18 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Khalili",
"F. Ya.",
""
]
] | The ``optical bars''/``optical lever'' topologies of gravitational-wave antennae allow to obtain sensitivity better that the Standard Quantum Limit while keeping the optical pumping energy in the antenna relatively low. Element of the crucial importance in these schemes is the local meter which monitors the local test ... |
gr-qc/0007059 | Hirotaka Ochiai | Hirotaka Ochiai and Katsuhiko Sato | Dynamical Properties of Euclidean Solutions in a Multidimensional
Cosmological Model | 13 pages and 5 figures | Prog.Theor.Phys. 103 (2000) 893-905 | 10.1143/PTP.103.893 | null | gr-qc astro-ph hep-th | null | In the framework of the Hartle-Hawking no-boundary proposal, we investigated
quantum creation of the multidimensional universe with a cosmological constant
($\Lambda$) but without matter fields. We have found that the classical
solutions of the Euclidean Einstein equations in this model have
``quasi-attractors'', i.e... | [
{
"created": "Sat, 22 Jul 2000 06:36:02 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Ochiai",
"Hirotaka",
""
],
[
"Sato",
"Katsuhiko",
""
]
] | In the framework of the Hartle-Hawking no-boundary proposal, we investigated quantum creation of the multidimensional universe with a cosmological constant ($\Lambda$) but without matter fields. We have found that the classical solutions of the Euclidean Einstein equations in this model have ``quasi-attractors'', i.e.,... |
1111.0395 | Muzaffer Adak | \"Ozcan Sert (Pamukkale U.) and Muzaffer Adak (Pamukkale U.) | Dirac field in topologically massive gravity | 12 pages. Title changed. Conclusion extended. Appendix added. To
appear in Gen. Rel. Grav | Gen Relativ Gravit 45 (2013) 69 | 10.1007/s10714-012-1460-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a Dirac field coupled minimally to the Mielke-Baekler model of
gravity and investigate cosmological solutions in three dimensions. We arrive
at a family of solutions which exists even in the limit of vanishing
cosmological constant.
| [
{
"created": "Wed, 2 Nov 2011 06:00:54 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Sep 2012 11:59:51 GMT",
"version": "v2"
}
] | 2013-09-24 | [
[
"Sert",
"Özcan",
"",
"Pamukkale U."
],
[
"Adak",
"Muzaffer",
"",
"Pamukkale U."
]
] | We consider a Dirac field coupled minimally to the Mielke-Baekler model of gravity and investigate cosmological solutions in three dimensions. We arrive at a family of solutions which exists even in the limit of vanishing cosmological constant. |
gr-qc/0503114 | Abel Camacho Mr. | Abel Camacho (Dept. of Physics, Universidad Autonoma
Metropolitana--Iztapalapa) | Continuous distribution of frequencies and deformed dispersion relations | Accepted in Classical and Quantum Gravity | Class.Quant.Grav. 22 (2005) 2101-2106 | 10.1088/0264-9381/22/11/012 | null | gr-qc quant-ph | null | The possibilities that, in the realm of the detection of the so--called
deformed dispersion relation, a light source with a continuous distribution of
frequencies offers is discussed. It will be proved that the presence of finite
coherence length entails the emergence of a new term in the interference
pattern. This i... | [
{
"created": "Tue, 29 Mar 2005 16:51:29 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Camacho",
"Abel",
"",
"Dept. of Physics, Universidad Autonoma\n Metropolitana--Iztapalapa"
]
] | The possibilities that, in the realm of the detection of the so--called deformed dispersion relation, a light source with a continuous distribution of frequencies offers is discussed. It will be proved that the presence of finite coherence length entails the emergence of a new term in the interference pattern. This is ... |
gr-qc/0202092 | Anders Hoeglund | G. Bergqvist and A. Hoglund | Algebraic Rainich theory and antisymmetrisation in higher dimensions | 16 pages, LaTeX | Class.Quant.Grav. 19 (2002) 3341-3356 | 10.1088/0264-9381/19/12/316 | null | gr-qc | null | The classical Rainich(-Misner-Wheeler) theory gives necessary and sufficient
conditions on an energy-momentum tensor $T$ to be that of a Maxwell field (a
2-form) in four dimensions. Via Einstein's equations these conditions can be
expressed in terms of the Ricci tensor, thus providing conditions on a
spacetime geomet... | [
{
"created": "Tue, 26 Feb 2002 14:49:20 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Bergqvist",
"G.",
""
],
[
"Hoglund",
"A.",
""
]
] | The classical Rainich(-Misner-Wheeler) theory gives necessary and sufficient conditions on an energy-momentum tensor $T$ to be that of a Maxwell field (a 2-form) in four dimensions. Via Einstein's equations these conditions can be expressed in terms of the Ricci tensor, thus providing conditions on a spacetime geometry... |
1908.00389 | Emmanuil Saridakis | Shin'ichi Nojiri, Sergei D. Odintsov, Emmanuel N. Saridakis | Holographic bounce | 7 pages, 1 figure, to appear in Nucl.Phys.B | null | 10.1016/j.nuclphysb.2019.114790 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the bounce realization arising from the application of the
holographic principle in the early universe, inspired by its well-studied
late-time application. We first consider as Infrared cutoffs the particle and
future event horizons, and we show that the decrease of the horizons at early
times naturall... | [
{
"created": "Thu, 1 Aug 2019 13:40:13 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Sep 2019 12:57:50 GMT",
"version": "v2"
}
] | 2019-10-28 | [
[
"Nojiri",
"Shin'ichi",
""
],
[
"Odintsov",
"Sergei D.",
""
],
[
"Saridakis",
"Emmanuel N.",
""
]
] | We investigate the bounce realization arising from the application of the holographic principle in the early universe, inspired by its well-studied late-time application. We first consider as Infrared cutoffs the particle and future event horizons, and we show that the decrease of the horizons at early times naturally ... |
gr-qc/0103100 | Steven Carlip | S. Carlip | Liouville Lost, Liouville Regained: Central Charge in a Dynamical
Background | 8 pages, LaTeX, no figures; reference added | Phys.Lett.B508:168-172,2001 | 10.1016/S0370-2693(01)00484-1 | UCD-2001-1 | gr-qc hep-th | null | Several recent approaches to black hole entropy obtain the density of states
from the central charge of a Liouville theory. If Liouville theory is coupled
to a dynamical spacetime background, however, the classical central charge
vanishes. I show that the central charge can be restored by introducing
appropriate cons... | [
{
"created": "Tue, 27 Mar 2001 23:00:17 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Mar 2001 00:13:10 GMT",
"version": "v2"
}
] | 2010-04-28 | [
[
"Carlip",
"S.",
""
]
] | Several recent approaches to black hole entropy obtain the density of states from the central charge of a Liouville theory. If Liouville theory is coupled to a dynamical spacetime background, however, the classical central charge vanishes. I show that the central charge can be restored by introducing appropriate constr... |
1507.06664 | Abraao Capistrano | Abra\~ao J.S Capistrano, Antonio C. Guti\'errez-Pi\~neres, Sergio C.
Ulhoa, Ronni G.G. Amorim | On the thermal stability of a static spherically symmetric black holes
in Nash embedding framework | 10 pages,6 figures, 1 table, extended discussion on embeddings,
corrected typos and references | Annals of Physics (Print), v. 380, p. 106-120, 2017 | 10.1016/j.aop.2017.03.006 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the deformation caused by the influence of extrinsic curvature on a
vacuum spherically symmetric metric embedded in a five-dimensional bulk. In
this sense, we investigate the produced black-holes and derive general
characteristics such as their masses, horizons, singularities and thermal
properties. As a tes... | [
{
"created": "Mon, 20 Jul 2015 23:27:04 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Dec 2015 19:31:47 GMT",
"version": "v2"
},
{
"created": "Tue, 24 May 2016 15:45:06 GMT",
"version": "v3"
},
{
"created": "Fri, 29 Jul 2016 14:47:53 GMT",
"version": "v4"
}
] | 2017-04-06 | [
[
"Capistrano",
"Abraão J. S",
""
],
[
"Gutiérrez-Piñeres",
"Antonio C.",
""
],
[
"Ulhoa",
"Sergio C.",
""
],
[
"Amorim",
"Ronni G. G.",
""
]
] | We study the deformation caused by the influence of extrinsic curvature on a vacuum spherically symmetric metric embedded in a five-dimensional bulk. In this sense, we investigate the produced black-holes and derive general characteristics such as their masses, horizons, singularities and thermal properties. As a test,... |
1904.00062 | Antonio Ferreiro | Antonio Ferreiro, Adrian del Rio, Jose Navarro-Salas, Silvia Pla,
Francisco Torrenti | Adiabatic regularization with a Yukawa interaction | 6 pages. Contribution to the Marcel Grossmann Meeting 2018 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the adiabatic regularization method for an expanding universe to
include the Yukawa interaction between a quantized Dirac field and a
homogeneous time-dependent scalar field. We present the renormalized
semiclassical equations that are needed in order to take into account the
backreaction of the produced Di... | [
{
"created": "Fri, 29 Mar 2019 19:29:12 GMT",
"version": "v1"
}
] | 2019-04-02 | [
[
"Ferreiro",
"Antonio",
""
],
[
"del Rio",
"Adrian",
""
],
[
"Navarro-Salas",
"Jose",
""
],
[
"Pla",
"Silvia",
""
],
[
"Torrenti",
"Francisco",
""
]
] | We extend the adiabatic regularization method for an expanding universe to include the Yukawa interaction between a quantized Dirac field and a homogeneous time-dependent scalar field. We present the renormalized semiclassical equations that are needed in order to take into account the backreaction of the produced Dira... |
1404.5260 | Avirup Ghosh | Avirup Ghosh | Note on Kerr/CFT correspondence in a first order formalism | computation errors corrected, results changed and re-interpreted,
version accepted for publication in Phys. Rev. D | Phys. Rev. D 89, 124035(2014) | 10.1103/PhysRevD.89.124035 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In symmetry based approaches to black hole entropy, we calculate the central
charge of the Virasoro algebra in the first order formulation of gravity for
both Palatini and Holst actions. In these calculations, we made use of the NHEK
metric and the Kerr-CFT correspondence. For the Palatini action the results
obtained... | [
{
"created": "Mon, 21 Apr 2014 18:10:43 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jun 2014 19:33:18 GMT",
"version": "v2"
}
] | 2014-07-01 | [
[
"Ghosh",
"Avirup",
""
]
] | In symmetry based approaches to black hole entropy, we calculate the central charge of the Virasoro algebra in the first order formulation of gravity for both Palatini and Holst actions. In these calculations, we made use of the NHEK metric and the Kerr-CFT correspondence. For the Palatini action the results obtained i... |
gr-qc/0103059 | Jeongwon Ho | Jeongwon Ho | A Proof of the Generalized Second Law for Two-Dimensional Black Holes | 15 pages, boundary condition of static black hole is added to clarify
the situation, abstract and section 4 (concluding remarks) is rewritten, and
minor corrections, references added | Phys.Rev. D64 (2001) 064019 | 10.1103/PhysRevD.64.064019 | null | gr-qc hep-th | null | We investigate the generalized second law for two-dimensional black holes in
equilibrium (Hartle-Hawking) and nonequilibrium (Unruh) with the heat bath
surrounding the black holes. We obtain a simple expression for the change of
total entropy in terms of covariant thermodynamic variables, which is valid not
only for ... | [
{
"created": "Fri, 16 Mar 2001 10:22:20 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Apr 2001 14:52:44 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Ho",
"Jeongwon",
""
]
] | We investigate the generalized second law for two-dimensional black holes in equilibrium (Hartle-Hawking) and nonequilibrium (Unruh) with the heat bath surrounding the black holes. We obtain a simple expression for the change of total entropy in terms of covariant thermodynamic variables, which is valid not only for th... |
2108.11423 | Jafar Khodagholizadeh | Jafar Khodagholizadeh | Neutrinos as a probe of curvature | 14 pages and 2 figures | Journal of High Energy Astrophysics, Volume 32, November 2021,
Pages 20-27 | 10.1016/j.jheap.2021.08.002 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutrinos, as the anisotropic stress tensor, have a damping effect on the
tensor mode perturbation from inflation to the $ \Lambda$ dominated era. First,
we study the squared amplitude reduction for the wavelength entering the
horizon during radiation and matter-dominated phases in the negatively curved
de Sitter spa... | [
{
"created": "Wed, 25 Aug 2021 18:30:53 GMT",
"version": "v1"
}
] | 2021-08-27 | [
[
"Khodagholizadeh",
"Jafar",
""
]
] | Neutrinos, as the anisotropic stress tensor, have a damping effect on the tensor mode perturbation from inflation to the $ \Lambda$ dominated era. First, we study the squared amplitude reduction for the wavelength entering the horizon during radiation and matter-dominated phases in the negatively curved de Sitter space... |
1210.8355 | Youngsub Yoon | Youngsub Yoon | Quantum corrections to the Hawking radiation spectrum | Section 9 "implications on the black hole information paradox" added.
arXiv admin note: text overlap with arXiv:0706.1979 by other authors | Journal of the Korean Physical Society, Vol. 68, No. 6, March
2016, pp. 730-734 | 10.3938/jkps.68.730 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In 1995, Bekenstein and Mukhanov suggested that the Hawking radiation
spectrum was discrete if the area spectrum was quantized in such a way that the
allowed areas were integer multiples of a single unit area. However, in 1996,
Barreira, Carfora, and Rovelli argued that the Hawking radiation spectrum was
continuous i... | [
{
"created": "Tue, 30 Oct 2012 18:45:01 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Feb 2013 08:59:56 GMT",
"version": "v2"
},
{
"created": "Wed, 6 May 2015 14:29:19 GMT",
"version": "v3"
},
{
"created": "Fri, 8 May 2015 08:35:33 GMT",
"version": "v4"
},
{
"cre... | 2016-05-12 | [
[
"Yoon",
"Youngsub",
""
]
] | In 1995, Bekenstein and Mukhanov suggested that the Hawking radiation spectrum was discrete if the area spectrum was quantized in such a way that the allowed areas were integer multiples of a single unit area. However, in 1996, Barreira, Carfora, and Rovelli argued that the Hawking radiation spectrum was continuous if ... |
gr-qc/0304011 | Lorenzo Iorio | Lorenzo Iorio, Alberto Morea | The impact of the new Earth gravity models on the measurement of the
Lense-Thirring effect | LaTeX, 15 pages, no figures, 4 tables. To appear in General
Relativity and Gravitation | Gen.Rel.Grav. 36 (2004) 1321-1333 | 10.1023/B:GERG.0000022390.05674.99 | null | gr-qc astro-ph physics.geo-ph physics.space-ph | null | In this paper we use, in a preliminary way, the recently released EIGEN2
Earth gravity model, which is based on six months of data of CHAMP only, in
order to reassess the systematic error due to the mismodelling in the even
zonal harmonics of geopotential in the LAGEOS-LAGEOS II Lense-Thirring
experiment involving th... | [
{
"created": "Wed, 2 Apr 2003 07:30:42 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Apr 2003 21:11:50 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Aug 2003 09:47:12 GMT",
"version": "v3"
},
{
"created": "Sun, 7 Sep 2003 15:52:09 GMT",
"version": "v4"
},
{
"cre... | 2007-11-12 | [
[
"Iorio",
"Lorenzo",
""
],
[
"Morea",
"Alberto",
""
]
] | In this paper we use, in a preliminary way, the recently released EIGEN2 Earth gravity model, which is based on six months of data of CHAMP only, in order to reassess the systematic error due to the mismodelling in the even zonal harmonics of geopotential in the LAGEOS-LAGEOS II Lense-Thirring experiment involving the ... |
1803.01395 | Andr\'as L\'aszl\'o | Andras Laszlo, Zoltan Zimboras | Quantification of GR effects in muon g-2, EDM and other spin precession
experiments | Final, published version. Conclusions: no measurable GR effect for
g-2 experiments, but significant GR effect for EDM (frozen spin) experiments,
growing unboundedly with Lorentz factor | Classical and Quantum Gravity 35 (2018) 175003 | 10.1088/1361-6382/aacfee | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, Morishima, Futamase and Shimizu published a series of manuscripts,
putting forward arguments, based on a post-Newtonian approximative calculation,
that there can be a sizable general relativistic (GR) correction in the
experimental determination of the muon magnetic moment based on spin
precession, i.e., in... | [
{
"created": "Sun, 4 Mar 2018 18:04:43 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Mar 2018 18:30:07 GMT",
"version": "v2"
},
{
"created": "Tue, 10 Apr 2018 11:39:32 GMT",
"version": "v3"
},
{
"created": "Thu, 26 Jul 2018 07:16:23 GMT",
"version": "v4"
}
] | 2018-07-27 | [
[
"Laszlo",
"Andras",
""
],
[
"Zimboras",
"Zoltan",
""
]
] | Recently, Morishima, Futamase and Shimizu published a series of manuscripts, putting forward arguments, based on a post-Newtonian approximative calculation, that there can be a sizable general relativistic (GR) correction in the experimental determination of the muon magnetic moment based on spin precession, i.e., in m... |
1803.08060 | Rodrigo Vicente | Rodrigo Vicente, Vitor Cardoso, Jorge C. Lopes | The Penrose process, superradiance and ergoregion instabilities | 20 pages, accepted for publication in PRD | null | 10.1103/PhysRevD.97.084032 | null | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Superradiant scattering is a radiation enhancement process that takes place
in many contexts, and which has recently found exciting applications in astro
and particle physics. In the framework of curved spacetime physics, it has been
associated with the classical Penrose process for particles. Superradiance is
usuall... | [
{
"created": "Wed, 21 Mar 2018 18:00:20 GMT",
"version": "v1"
}
] | 2018-05-09 | [
[
"Vicente",
"Rodrigo",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"Lopes",
"Jorge C.",
""
]
] | Superradiant scattering is a radiation enhancement process that takes place in many contexts, and which has recently found exciting applications in astro and particle physics. In the framework of curved spacetime physics, it has been associated with the classical Penrose process for particles. Superradiance is usually ... |
1111.0967 | Frank C Eckert | Bianca Dittrich and Frank C Eckert | Towards computational insights into the large-scale structure of spin
foams | 10 pages, 9 figures, to be published in proceedings of the Loops'11
Madrid international conference on quantum gravity | null | 10.1088/1742-6596/360/1/012004 | null | gr-qc cond-mat.str-el hep-lat quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Understanding the large-scale physics is crucial for the spin foam approach
to quantum gravity. We tackle this challenge from a statistical physics
perspective using simplified, yet feature-rich models. In particular, this
allows us to explicitly answer whether broken symmetries will be restored by
renormalization: W... | [
{
"created": "Thu, 3 Nov 2011 20:00:04 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Dittrich",
"Bianca",
""
],
[
"Eckert",
"Frank C",
""
]
] | Understanding the large-scale physics is crucial for the spin foam approach to quantum gravity. We tackle this challenge from a statistical physics perspective using simplified, yet feature-rich models. In particular, this allows us to explicitly answer whether broken symmetries will be restored by renormalization: We ... |
1404.7210 | Peter Taylor | Peter Taylor | Propagation of Test Particles and Scalar Fields on a Class of Wormhole
Space-Times | Corrected a significant error in Sec. III. In a previous version, the
values of the coupling constant for which the scalar field is stable was
stated incorrectly | Phys. Rev. D 95, 109904 (2017) | 10.1103/PhysRevD.90.024057 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we consider the problem of test particles and test scalar
fields propagating on the background of a class of wormhole space-times. For
test particles, we solve for arbitrary causal geodesics in terms of integrals
which are solved numerically. These integrals are parametrized by the radius
and shape of ... | [
{
"created": "Tue, 29 Apr 2014 02:08:55 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Aug 2014 10:00:31 GMT",
"version": "v2"
},
{
"created": "Mon, 11 Apr 2016 15:12:35 GMT",
"version": "v3"
}
] | 2017-05-31 | [
[
"Taylor",
"Peter",
""
]
] | In this paper, we consider the problem of test particles and test scalar fields propagating on the background of a class of wormhole space-times. For test particles, we solve for arbitrary causal geodesics in terms of integrals which are solved numerically. These integrals are parametrized by the radius and shape of th... |
1910.05642 | Daniele Pranzetti | Laurent Freidel, Etera R. Livine, Daniele Pranzetti | Kinematical Gravitational Charge Algebra | version 2, 14 pages, some typos fixed; published version | Phys. Rev. D 101, 024012 (2020) | 10.1103/PhysRevD.101.024012 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When formulated in terms of connection and coframes, and in the time gauge,
the phase space of general relativity consists of a pair of conjugate fields:
the flux 2-form and the Ashtekar connection. On this phase-space, one has to
impose the Gauss constraints, the vector, and scalar Hamiltonian constraints.
These are... | [
{
"created": "Sat, 12 Oct 2019 20:17:09 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Jan 2020 09:54:22 GMT",
"version": "v2"
}
] | 2020-01-08 | [
[
"Freidel",
"Laurent",
""
],
[
"Livine",
"Etera R.",
""
],
[
"Pranzetti",
"Daniele",
""
]
] | When formulated in terms of connection and coframes, and in the time gauge, the phase space of general relativity consists of a pair of conjugate fields: the flux 2-form and the Ashtekar connection. On this phase-space, one has to impose the Gauss constraints, the vector, and scalar Hamiltonian constraints. These are r... |
gr-qc/9511041 | Renato Klippert Barcellos | Luciane R. de Freitas, M. Novello | What is the Velocity of Gravitational Waves? | 25 pages, LaTeX | null | null | LAFEX-95-MN1 | gr-qc | null | We present a new field theory of gravity. It incorporates a great part of
General Relativity (GR) and can be interpreted in the standard geometrical way
like GR as far as the interaction of matter to gravity is concerned. However,
it differs from GR when treating gravity to gravity interaction. The most
crucial disti... | [
{
"created": "Tue, 14 Nov 1995 16:36:28 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"de Freitas",
"Luciane R.",
""
],
[
"Novello",
"M.",
""
]
] | We present a new field theory of gravity. It incorporates a great part of General Relativity (GR) and can be interpreted in the standard geometrical way like GR as far as the interaction of matter to gravity is concerned. However, it differs from GR when treating gravity to gravity interaction. The most crucial distinc... |
2011.13957 | Abolhassan Mohammadi | Abolhassan Mohammadi, Tayeb Golanbari, Jamil Enayati, Shahram
Jalalzadeh, Khaled Saaidi | Revisiting Scalar Tensor inflation by swampland criteria and Reheating | 28 pages, 14 figures | null | null | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | The scenario of the slow-roll inflation is studied in the frame of the
scalar-tensor theory of gravity where the scalar field has a non-minimal
coupling to the geometric part. After deriving the main dynamical and
perturbation equations, the model is investigated in detail for different
functions of the potential and... | [
{
"created": "Fri, 27 Nov 2020 19:02:55 GMT",
"version": "v1"
}
] | 2020-12-01 | [
[
"Mohammadi",
"Abolhassan",
""
],
[
"Golanbari",
"Tayeb",
""
],
[
"Enayati",
"Jamil",
""
],
[
"Jalalzadeh",
"Shahram",
""
],
[
"Saaidi",
"Khaled",
""
]
] | The scenario of the slow-roll inflation is studied in the frame of the scalar-tensor theory of gravity where the scalar field has a non-minimal coupling to the geometric part. After deriving the main dynamical and perturbation equations, the model is investigated in detail for different functions of the potential and t... |
2212.02999 | Yergali Kurmanov Dr. | Kuantay Boshkayev, Talgar Konysbayev, Yergali Kurmanov, Orlando
Luongo, Marco Muccino, Hernando Quevedo, Gulnur Zhumakhanova | Numerical analyses of M31 dark matter profiles | 10 pages, 7 figures and 7 tables | null | null | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reproduce the rotation curve of the Andromeda galaxy (M31) by taking into
account its bulge, disk, and halo components, considering the last one to
contain the major part of dark matter mass. Hence, our prescription is to split
the galactic bulge into two components, namely, the inner and main bulges,
respectively... | [
{
"created": "Tue, 6 Dec 2022 14:19:46 GMT",
"version": "v1"
}
] | 2022-12-07 | [
[
"Boshkayev",
"Kuantay",
""
],
[
"Konysbayev",
"Talgar",
""
],
[
"Kurmanov",
"Yergali",
""
],
[
"Luongo",
"Orlando",
""
],
[
"Muccino",
"Marco",
""
],
[
"Quevedo",
"Hernando",
""
],
[
"Zhumakhanova",
"Gulnur",
... | We reproduce the rotation curve of the Andromeda galaxy (M31) by taking into account its bulge, disk, and halo components, considering the last one to contain the major part of dark matter mass. Hence, our prescription is to split the galactic bulge into two components, namely, the inner and main bulges, respectively. ... |
1701.08203 | Jos\'e Alberto Casto Nogales Vera | Renato Vieira dos Santos, Jos\'e A. C. Nogales | Cosmology from a Lagrangian formulation for Rastall's theory | 13 pages, 3 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give a Lagrangian formulation for the theory of Rastall of gravitation.
After proposing a Lagrangian density that reproduces the equations of motion
postulated by Rastall, we study the cosmological consequences and fit the
parameters using recent data from Hubble function $H(z).$ According to two
model selection c... | [
{
"created": "Fri, 27 Jan 2017 21:46:40 GMT",
"version": "v1"
}
] | 2017-01-31 | [
[
"Santos",
"Renato Vieira dos",
""
],
[
"Nogales",
"José A. C.",
""
]
] | We give a Lagrangian formulation for the theory of Rastall of gravitation. After proposing a Lagrangian density that reproduces the equations of motion postulated by Rastall, we study the cosmological consequences and fit the parameters using recent data from Hubble function $H(z).$ According to two model selection cri... |
2201.07266 | Pablo Bueno | Pablo Bueno, Pablo A. Cano, Quim Llorens, Javier Moreno and Guido van
der Velde | Aspects of three-dimensional higher-curvature gravities | 41 pages; v2: typos fixed, references added | null | 10.1088/1361-6382/ac6cbf | CERN-TH-2022-006 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present new results involving general higher-curvature gravities in three
dimensions. The most general Lagrangian can be written as a function of the
Ricci scalar $R$, $\mathcal{S}_2\equiv \tilde R_{a}^b \tilde R_b^a$ and
$\mathcal{S}_3\equiv \tilde R_a^b \tilde R_b^c \tilde R_c^a$ where $\tilde
R_{ab}$ is the tra... | [
{
"created": "Tue, 18 Jan 2022 19:12:52 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Jan 2022 14:55:26 GMT",
"version": "v2"
}
] | 2022-06-01 | [
[
"Bueno",
"Pablo",
""
],
[
"Cano",
"Pablo A.",
""
],
[
"Llorens",
"Quim",
""
],
[
"Moreno",
"Javier",
""
],
[
"van der Velde",
"Guido",
""
]
] | We present new results involving general higher-curvature gravities in three dimensions. The most general Lagrangian can be written as a function of the Ricci scalar $R$, $\mathcal{S}_2\equiv \tilde R_{a}^b \tilde R_b^a$ and $\mathcal{S}_3\equiv \tilde R_a^b \tilde R_b^c \tilde R_c^a$ where $\tilde R_{ab}$ is the trace... |
2104.12293 | Anna Ijjas | Anna Ijjas and Frans Pretorius and Paul J. Steinhardt and Andrew P.
Sullivan | The Effects of Multiple Modes and Reduced Symmetry on the Rapidity and
Robustness of Slow Contraction | 5 pages, 2 figures | Phys. Lett. B 820 (2021) 136490 | 10.1016/j.physletb.2021.136490 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate that the rapidity and robustness of slow contraction in
homogenizing and flattening the universe found in simulations in which the
initial conditions were restricted to non-perturbative variations described by
a single fourier mode along only a single spatial direction are in general
enhanced if the in... | [
{
"created": "Mon, 26 Apr 2021 00:32:06 GMT",
"version": "v1"
}
] | 2021-07-13 | [
[
"Ijjas",
"Anna",
""
],
[
"Pretorius",
"Frans",
""
],
[
"Steinhardt",
"Paul J.",
""
],
[
"Sullivan",
"Andrew P.",
""
]
] | We demonstrate that the rapidity and robustness of slow contraction in homogenizing and flattening the universe found in simulations in which the initial conditions were restricted to non-perturbative variations described by a single fourier mode along only a single spatial direction are in general enhanced if the init... |
2302.03418 | Tact Ikeda | Tact Ikeda, Kazufumi Takahashi and Tsutomu Kobayashi | Consistency of higher derivative couplings to matter fields in
scalar-tensor gravity | 11pages, no figure | null | 10.1103/PhysRevD.108.044006 | RUP-23-2, YITP-23-11 | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Recently, a generalization of invertible disformal transformations containing
higher-order derivatives of a scalar field has been proposed in the context of
scalar-tensor theories of gravity. By applying this generalized disformal
transformation to the Horndeski theory, one can obtain the so-called
generalized disfor... | [
{
"created": "Tue, 7 Feb 2023 12:05:30 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Aug 2023 06:24:13 GMT",
"version": "v2"
}
] | 2023-08-21 | [
[
"Ikeda",
"Tact",
""
],
[
"Takahashi",
"Kazufumi",
""
],
[
"Kobayashi",
"Tsutomu",
""
]
] | Recently, a generalization of invertible disformal transformations containing higher-order derivatives of a scalar field has been proposed in the context of scalar-tensor theories of gravity. By applying this generalized disformal transformation to the Horndeski theory, one can obtain the so-called generalized disforma... |
1906.08959 | Olivier Sarbach | Miguel Alcubierre, Juan Barranco, Argelia Bernal, Juan Carlos
Degollado, Alberto Diez-Tejedor, Miguel Megevand, Dar\'io N\'u\~nez, Olivier
Sarbach | Dynamical evolutions of $\ell$-boson stars in spherical symmetry | 17 pages, 8 figure. Updated version with more details on migrating
case, typos corrected and references added | null | 10.1088/1361-6382/ab4726 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In previous work, we have found new static, spherically symmetric boson star
solutions which generalize the standard boson stars by allowing a particular
superposition of scalar fields in which each of the fields is characterized by
a fixed value of its non-vanishing angular momentum number $\ell$. We call such
solut... | [
{
"created": "Fri, 21 Jun 2019 05:58:05 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Oct 2019 13:26:59 GMT",
"version": "v2"
}
] | 2020-01-08 | [
[
"Alcubierre",
"Miguel",
""
],
[
"Barranco",
"Juan",
""
],
[
"Bernal",
"Argelia",
""
],
[
"Degollado",
"Juan Carlos",
""
],
[
"Diez-Tejedor",
"Alberto",
""
],
[
"Megevand",
"Miguel",
""
],
[
"Núñez",
"Darío",
... | In previous work, we have found new static, spherically symmetric boson star solutions which generalize the standard boson stars by allowing a particular superposition of scalar fields in which each of the fields is characterized by a fixed value of its non-vanishing angular momentum number $\ell$. We call such solutio... |
1403.2849 | Roman Juarez | Rom\'an Ju\'arez and David Mart\'inez | Noncommutative Coherent States and Quantum Cosmology | 21 pages | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The set of coherent states for a noncommutative quantum Bianchi I anisotropic
cosmology were built to circumvent the absence of a simultaneous set of
configuration observables. By extending known methods of path integrals with
coherent states to their noncommutative analogues allowed us to obtain the
formal expressio... | [
{
"created": "Wed, 12 Mar 2014 08:44:37 GMT",
"version": "v1"
}
] | 2014-03-13 | [
[
"Juárez",
"Román",
""
],
[
"Martínez",
"David",
""
]
] | The set of coherent states for a noncommutative quantum Bianchi I anisotropic cosmology were built to circumvent the absence of a simultaneous set of configuration observables. By extending known methods of path integrals with coherent states to their noncommutative analogues allowed us to obtain the formal expression ... |
1107.0466 | Luca Fabbri | Luca Fabbri | Conformal Standard Model | 9 pages | Gen.Rel.Grav.44:3127-3138,2012 | 10.1007/s10714-012-1440-6 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In recent papers we have constructed the conformal theory of metric-torsional
gravitation, and in this paper we shall include the gauge fields to study the
conformal U(1) X SU(2) Standard Model; we will show that the metric-torsional
degrees of freedom give rise to a potential of conformal-gauge dynamical
symmetry br... | [
{
"created": "Sun, 3 Jul 2011 15:15:01 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Sep 2012 22:57:40 GMT",
"version": "v2"
},
{
"created": "Thu, 10 Apr 2014 12:33:22 GMT",
"version": "v3"
}
] | 2014-04-11 | [
[
"Fabbri",
"Luca",
""
]
] | In recent papers we have constructed the conformal theory of metric-torsional gravitation, and in this paper we shall include the gauge fields to study the conformal U(1) X SU(2) Standard Model; we will show that the metric-torsional degrees of freedom give rise to a potential of conformal-gauge dynamical symmetry brea... |
1108.4591 | Debraj Roy | Rabin Banerjee, Sunandan Gangopadhyay and Debraj Roy | Hamiltonian analysis of symmetries in a massive theory of gravity | 15 pages, LaTeX2e; References updated; 16 pages, Minor modifications,
version accepted for publication in JHEP | JHEP 1110 (2011) 121 | 10.1007/JHEP10(2011)121 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct the generator of hamiltonian gauge symmetries in a 2+1
dimensional massive theory of gravity, proposed recently, through a systematic
off-shell algorithm. Using a field dependant map among gauge parameters we show
that the symmetries obtained from this generator are on-shell equivalent to the
Poincar\'{e... | [
{
"created": "Tue, 23 Aug 2011 13:21:47 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Aug 2011 09:38:29 GMT",
"version": "v2"
},
{
"created": "Thu, 20 Oct 2011 08:20:16 GMT",
"version": "v3"
}
] | 2011-11-30 | [
[
"Banerjee",
"Rabin",
""
],
[
"Gangopadhyay",
"Sunandan",
""
],
[
"Roy",
"Debraj",
""
]
] | We construct the generator of hamiltonian gauge symmetries in a 2+1 dimensional massive theory of gravity, proposed recently, through a systematic off-shell algorithm. Using a field dependant map among gauge parameters we show that the symmetries obtained from this generator are on-shell equivalent to the Poincar\'{e} ... |
gr-qc/0212086 | Joan Ferrando | J.J. Ferrando (U. de Valencia), J.A. S\'aez (U. de Valencia) | On the classification of type D spacetimes | 29 pages, 0 figures | J.Math.Phys. 45 (2004) 652-667 | 10.1063/1.1640795 | null | gr-qc | null | We give a classification of the type D spacetimes based on the invariant
differential properties of the Weyl principal structure. Our classification is
established using tensorial invariants of the Weyl tensor and, consequently,
besides its intrinsic nature, it is valid for the whole set of the type D
metrics and it ... | [
{
"created": "Fri, 20 Dec 2002 14:56:55 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Ferrando",
"J. J.",
"",
"U. de Valencia"
],
[
"Sáez",
"J. A.",
"",
"U. de Valencia"
]
] | We give a classification of the type D spacetimes based on the invariant differential properties of the Weyl principal structure. Our classification is established using tensorial invariants of the Weyl tensor and, consequently, besides its intrinsic nature, it is valid for the whole set of the type D metrics and it ap... |
1105.0188 | Piero Nicolini | Piero Nicolini and Giorgio Torrieri | The Hawking-Page crossover in noncommutative anti-deSitter space | 24 pages, 6 figure, 1 table, version matching that published on JHEP | JHEP 1108:097,2011 | 10.1007/JHEP08(2011)097 | null | gr-qc hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the problem of a Schwarzschild-anti-deSitter black hole in a
noncommutative geometry framework, thought to be an effective description of
quantum-gravitational spacetime. As a first step we derive the noncommutative
geometry inspired Schwarzschild-anti-deSitter solution. After studying the
horizon structure,... | [
{
"created": "Sun, 1 May 2011 17:56:20 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Sep 2011 08:24:22 GMT",
"version": "v2"
}
] | 2011-09-14 | [
[
"Nicolini",
"Piero",
""
],
[
"Torrieri",
"Giorgio",
""
]
] | We study the problem of a Schwarzschild-anti-deSitter black hole in a noncommutative geometry framework, thought to be an effective description of quantum-gravitational spacetime. As a first step we derive the noncommutative geometry inspired Schwarzschild-anti-deSitter solution. After studying the horizon structure, w... |
0707.2519 | Jose Natario | Filipe C. Mena, Jose Natario and Paul Tod | Gravitational Collapse to Toroidal and Higher Genus asymptotically AdS
Black Holes | 15 pages, 2 figures; v2: typos corrected, references added | Adv.Theor.Math.Phys. 12 (2008) 1163-1181 | null | null | gr-qc astro-ph hep-th | null | We match collapsing inhomogeneous as well as spatially homogeneous but
anisotropic spacetimes to vacuum static exteriors with a negative cosmological
constant and planar or hyperbolic symmetry. The collapsing interiors include
the inhomogeneous solutions of Szekeres and of Barnes, which in turn include
the Lemaitre-T... | [
{
"created": "Tue, 17 Jul 2007 13:35:52 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Apr 2008 10:55:03 GMT",
"version": "v2"
}
] | 2008-07-15 | [
[
"Mena",
"Filipe C.",
""
],
[
"Natario",
"Jose",
""
],
[
"Tod",
"Paul",
""
]
] | We match collapsing inhomogeneous as well as spatially homogeneous but anisotropic spacetimes to vacuum static exteriors with a negative cosmological constant and planar or hyperbolic symmetry. The collapsing interiors include the inhomogeneous solutions of Szekeres and of Barnes, which in turn include the Lemaitre-Tol... |
1710.03783 | David Wallace | David Wallace | Why Black Hole Information Loss is Paradoxical | 26 pages. Corrected error in one diagram; other minor revisions | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I distinguish between two versions of the black hole information-loss
paradox. The first arises from apparent failure of unitarity on the spacetime
of a completely evaporating black hole, which appears to be
non-globally-hyperbolic; this is the most commonly discussed version of the
paradox in the foundational and se... | [
{
"created": "Tue, 10 Oct 2017 18:53:08 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jun 2018 00:20:57 GMT",
"version": "v2"
}
] | 2018-06-18 | [
[
"Wallace",
"David",
""
]
] | I distinguish between two versions of the black hole information-loss paradox. The first arises from apparent failure of unitarity on the spacetime of a completely evaporating black hole, which appears to be non-globally-hyperbolic; this is the most commonly discussed version of the paradox in the foundational and semi... |
gr-qc/9912035 | Massimo Giovannini | D. Babusci (LNF, INFN) and M. Giovannini (Institute for Theoretical
Physics, Lausanne University) | Upgraded VIRGO detector(s) and stochastic gravitational waves
backgrounds | 19 pages in Revtex style, 9 figures | null | null | UNIL-IPT/99-7 | gr-qc astro-ph hep-ph hep-th | null | The sensitivity achievable by a pair of VIRGO detectors to stochastic and
isotropic gravitational wave backgrounds of cosmological origin is discussed in
view of the development of a second VIRGO interferometer. We describe a
semi-analytical technique allowing to compute the signal-to-noise ratio for
(monotonic or no... | [
{
"created": "Thu, 9 Dec 1999 12:28:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Babusci",
"D.",
"",
"LNF, INFN"
],
[
"Giovannini",
"M.",
"",
"Institute for Theoretical\n Physics, Lausanne University"
]
] | The sensitivity achievable by a pair of VIRGO detectors to stochastic and isotropic gravitational wave backgrounds of cosmological origin is discussed in view of the development of a second VIRGO interferometer. We describe a semi-analytical technique allowing to compute the signal-to-noise ratio for (monotonic or non-... |
gr-qc/9404020 | Eric Woolgar | E. Woolgar | Positive Energy for Asymptotically Anti-de Sitter Schwarzschild
Spacetimes | talk given at Fifth Canadian Conference on General Relativity and
Relativistic Astrophysics, Waterloo, 1993. (Plain TeX) | null | null | null | gr-qc | null | Within the general class of Asymptotically Anti-de Sitter spacetimes that are
asymptotic to the A-de-S Schwarzschild metric, we give a simple positive mass
theorem based on arguments from causal structure. A general result for all
asymptotically A-de-S spacetimes will be given elsewhere.
| [
{
"created": "Mon, 11 Apr 1994 22:51:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Woolgar",
"E.",
""
]
] | Within the general class of Asymptotically Anti-de Sitter spacetimes that are asymptotic to the A-de-S Schwarzschild metric, we give a simple positive mass theorem based on arguments from causal structure. A general result for all asymptotically A-de-S spacetimes will be given elsewhere. |
0711.4558 | Enrico Barausse | E. Barausse (SISSA, Italy) and L. Rezzolla (AEI, Germany) | The influence of the hydrodynamic drag from an accretion torus on
extreme mass-ratio inspirals | 21 pages, 8 figures. Phys. Rev. D, in press. Typos fixed and minor
changes; added discussion on the gravitational pull exerted by the torus | Phys.Rev.D77:104027,2008 | 10.1103/PhysRevD.77.104027 | null | gr-qc astro-ph | null | We have studied extreme mass-ratio inspirals (EMRIs) in spacetimes containing
a rotating black hole and a non self-gravitating torus with constant specific
angular momentum. We have found that the effect of the hydrodynamic drag
exerted by the torus on the satellite is much smaller than the corresponding
one due to r... | [
{
"created": "Wed, 28 Nov 2007 18:55:08 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Nov 2007 22:07:50 GMT",
"version": "v2"
},
{
"created": "Fri, 16 May 2008 12:21:39 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Barausse",
"E.",
"",
"SISSA, Italy"
],
[
"Rezzolla",
"L.",
"",
"AEI, Germany"
]
] | We have studied extreme mass-ratio inspirals (EMRIs) in spacetimes containing a rotating black hole and a non self-gravitating torus with constant specific angular momentum. We have found that the effect of the hydrodynamic drag exerted by the torus on the satellite is much smaller than the corresponding one due to rad... |
1703.04840 | P. A. Gonzalez | P. A. Gonz\'alez, Marco Olivares, Eleftherios Papantonopoulos, Joel
Saavedra and Yerko V\'asquez | Motion of magnetically charged particles in a magnetically charged
stringy black hole spacetime | Version accepted for publication in PRD | Phys. Rev. D 95, 104052 (2017) | 10.1103/PhysRevD.95.104052 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the motion of massive particles with electric and magnetic charges
in the background of a magnetically charged Garfinkle-Horowitz-Strominger
stringy black hole. We solve analytically the equations of motion of the test
particles and we describe the orbital motion in terms of the Weierstrass
elliptic function... | [
{
"created": "Tue, 14 Mar 2017 23:57:07 GMT",
"version": "v1"
},
{
"created": "Thu, 11 May 2017 13:11:59 GMT",
"version": "v2"
}
] | 2017-06-07 | [
[
"González",
"P. A.",
""
],
[
"Olivares",
"Marco",
""
],
[
"Papantonopoulos",
"Eleftherios",
""
],
[
"Saavedra",
"Joel",
""
],
[
"Vásquez",
"Yerko",
""
]
] | We study the motion of massive particles with electric and magnetic charges in the background of a magnetically charged Garfinkle-Horowitz-Strominger stringy black hole. We solve analytically the equations of motion of the test particles and we describe the orbital motion in terms of the Weierstrass elliptic functions.... |
gr-qc/0011092 | Jose' P. S. Lemos | Jose' P. S. Lemos | Black holes with toroidal, cylindrical and planar horizons in anti-de
Sitter spacetimes in general relativity and their properties | LaTeX file (World Scientific macros), no figures, 16 pages, talk
given at the 10th Portuguese Meeting on Astronomy and Astrophysics, (Lisbon,
Portugal, 27-28 July 2000), in Astronomy and Astrophysics: Recent
Developments, Proceedings of the 10th A & A meeting, edited by J. P. S.
Lemos, A. Mourao, L. Teodoro, R.... | null | 10.1142/9789812811110_0011 | null | gr-qc astro-ph hep-th | null | We review the toroidal, cylindrical and planar black hole solutions in
anti-de Sitter spacetimes and present their properties.
| [
{
"created": "Mon, 27 Nov 2000 15:51:38 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Sep 2001 20:43:32 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"Lemos",
"Jose' P. S.",
""
]
] | We review the toroidal, cylindrical and planar black hole solutions in anti-de Sitter spacetimes and present their properties. |
1206.3675 | Sergio Ulhoa | S. C. Ulhoa and P. M. M. Rocha | Neutron Stars in Teleparallel Gravity | 19 pages, 14 figures. arXiv admin note: text overlap with
arXiv:1206.3317 | Brazilian Journal of Physics, June 2013, Volume 43, Issue 3, pp
162-171 | 10.1007/s13538-013-0121-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we deal with neutron stars, which are described by a perfect
fluid model, in the context of the teleparallel equivalent of general
relativity. We use numerical simulations to find the relationship between the
angular momentum of the field and the angular momentum of the source. Such a
relation was estab... | [
{
"created": "Sat, 16 Jun 2012 16:39:47 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Mar 2013 14:43:06 GMT",
"version": "v2"
}
] | 2013-12-06 | [
[
"Ulhoa",
"S. C.",
""
],
[
"Rocha",
"P. M. M.",
""
]
] | In this paper we deal with neutron stars, which are described by a perfect fluid model, in the context of the teleparallel equivalent of general relativity. We use numerical simulations to find the relationship between the angular momentum of the field and the angular momentum of the source. Such a relation was establi... |
gr-qc/9706003 | Hongsu Kim | Hongsu Kim (Ewha Women's Univ., Korea) | Toward a Complete Analysis of the Global Structure of Kerr-Newman
Spacetime | 18 pages, Revtex | null | null | null | gr-qc hep-th | null | An attempt is made to supplement Carter's partial investigation of the global
structure of Kerr-Newman spacetime on the symmetry axis. Namely, the global
structure of \theta = const. timelike submanifolds of Kerr-Newman metric
starting from the symmetry axis all the way down to the equatorial plane are
studied by int... | [
{
"created": "Mon, 2 Jun 1997 04:46:22 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kim",
"Hongsu",
"",
"Ewha Women's Univ., Korea"
]
] | An attempt is made to supplement Carter's partial investigation of the global structure of Kerr-Newman spacetime on the symmetry axis. Namely, the global structure of \theta = const. timelike submanifolds of Kerr-Newman metric starting from the symmetry axis all the way down to the equatorial plane are studied by intro... |
gr-qc/0501086 | Masato Minamitsuji | Masato Minamitsuji, Misao Sasaki and David Langlois | Kaluza-Klein gravitons are negative energy dust in brane cosmology | 17 pages | Phys.Rev.D71:084019,2005 | 10.1103/PhysRevD.71.084019 | YITP-05-03 | gr-qc astro-ph hep-th | null | We discuss the effect of Kaluza-Klein (KK) modes of bulk metric perturbations
on the second Randall-Sundrum (RS II) type brane cosmology, taking the possible
backreaction in the bulk and on the brane into account. KK gravitons may be
produced via quantum fluctuations during a de Sitter (dS) inflating phase of
our bra... | [
{
"created": "Thu, 27 Jan 2005 11:49:12 GMT",
"version": "v1"
}
] | 2009-10-09 | [
[
"Minamitsuji",
"Masato",
""
],
[
"Sasaki",
"Misao",
""
],
[
"Langlois",
"David",
""
]
] | We discuss the effect of Kaluza-Klein (KK) modes of bulk metric perturbations on the second Randall-Sundrum (RS II) type brane cosmology, taking the possible backreaction in the bulk and on the brane into account. KK gravitons may be produced via quantum fluctuations during a de Sitter (dS) inflating phase of our brane... |
gr-qc/0606102 | Preston Jones | Preston Jones | Temporal variations in space-time and progenitors of gamma ray burst and
millisecond pulsars | Accept by International Journal of Modern Physics D | Int.J.Mod.Phys.D16:1871-1877,2007 | 10.1142/S0218271807011164 | null | gr-qc | null | A time varying space-time metric is shown to be a source of electromagnetic
radiation. The post-Newtonian approximation is used as a realistic model of the
connection between the space-time metric and a time varying gravitational
potential. Large temporal variations in the metric from the coalescence of
colliding bla... | [
{
"created": "Fri, 23 Jun 2006 19:44:36 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Oct 2006 22:46:02 GMT",
"version": "v2"
},
{
"created": "Tue, 10 Apr 2007 17:28:31 GMT",
"version": "v3"
},
{
"created": "Fri, 31 Aug 2007 16:08:43 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Jones",
"Preston",
""
]
] | A time varying space-time metric is shown to be a source of electromagnetic radiation. The post-Newtonian approximation is used as a realistic model of the connection between the space-time metric and a time varying gravitational potential. Large temporal variations in the metric from the coalescence of colliding black... |
0711.0697 | Kirill Krasnov | Kirill Krasnov | Non-metric gravity: A status report | 13 pages, no figures, invited brief review for MPLA | Mod.Phys.Lett.A22:3013-3026,2007 | 10.1142/S021773230702590X | null | gr-qc astro-ph hep-th | null | We review the status of a certain (infinite) class of four-dimensional
generally covariant theories propagating two degrees of freedom that are
formulated without any direct mention of the metric. General relativity itself
(in its Plebanski formulation) belongs to the class, so these theories are
examples of modified... | [
{
"created": "Mon, 5 Nov 2007 17:12:50 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Krasnov",
"Kirill",
""
]
] | We review the status of a certain (infinite) class of four-dimensional generally covariant theories propagating two degrees of freedom that are formulated without any direct mention of the metric. General relativity itself (in its Plebanski formulation) belongs to the class, so these theories are examples of modified g... |
2312.07765 | Yerko V\'asquez | Alberto Fritis, Daniel Villalobos-Silva, Yerko V\'asquez, Carlos H.
L\'opez-Caraballo and Juan Carlos Helo | Dynamical system analysis and observational constraints of cosmological
models in mimetic gravity | null | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the dynamics of homogeneous and isotropic
Friedmann-Lema\^itre-Robertson-Walker cosmological models with positive spatial
curvature in mimetic gravity theory, employing dynamical system techniques. Our
analysis yields phase space trajectories that describe physically relevant
solutions, capturing various sta... | [
{
"created": "Tue, 12 Dec 2023 22:19:08 GMT",
"version": "v1"
}
] | 2023-12-14 | [
[
"Fritis",
"Alberto",
""
],
[
"Villalobos-Silva",
"Daniel",
""
],
[
"Vásquez",
"Yerko",
""
],
[
"López-Caraballo",
"Carlos H.",
""
],
[
"Helo",
"Juan Carlos",
""
]
] | We study the dynamics of homogeneous and isotropic Friedmann-Lema\^itre-Robertson-Walker cosmological models with positive spatial curvature in mimetic gravity theory, employing dynamical system techniques. Our analysis yields phase space trajectories that describe physically relevant solutions, capturing various stage... |
1505.06572 | Avisa Behboodi | A. Behboodi, S. Akhshabi, K. Nozari | Braneworld Cosmological Perturbations in Teleparallel Gravity | null | Physics Letters B 750C (2015) pp. 601-608 | 10.1016/j.physletb.2015.09.031 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe the fully gauge invariant cosmological perturbation equations in
braneworld teleparallel gravity. In this theory, perturbations are the result
of small fluctuations in the pentad field. We derive the gauge invariant
'potentials' for both geometric and matter variables. Unlike the metric
fluctuations in ge... | [
{
"created": "Mon, 25 May 2015 09:19:06 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Aug 2015 05:30:38 GMT",
"version": "v2"
}
] | 2015-10-20 | [
[
"Behboodi",
"A.",
""
],
[
"Akhshabi",
"S.",
""
],
[
"Nozari",
"K.",
""
]
] | We describe the fully gauge invariant cosmological perturbation equations in braneworld teleparallel gravity. In this theory, perturbations are the result of small fluctuations in the pentad field. We derive the gauge invariant 'potentials' for both geometric and matter variables. Unlike the metric fluctuations in gene... |
1908.01036 | Giovanni Tricella | Stefano Liberati (SISSA, INFN, IFPU), Giovanni Tricella (SISSA, INFN,
IFPU), Andrea Trombettoni (SISSA, INFN) | The information loss problem: an analogue gravity perspective | 35 pages | null | 10.3390/e21100940 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Analogue gravity can be used to reproduce the phenomenology of quantum field
theory in curved spacetime and in particular phenomena such as cosmological
particle creation and Hawking radiation. In black hole physics, taking into
account the backreaction of such effects on the metric requires an extension to
semiclass... | [
{
"created": "Fri, 2 Aug 2019 20:12:18 GMT",
"version": "v1"
}
] | 2019-10-23 | [
[
"Liberati",
"Stefano",
"",
"SISSA, INFN, IFPU"
],
[
"Tricella",
"Giovanni",
"",
"SISSA, INFN,\n IFPU"
],
[
"Trombettoni",
"Andrea",
"",
"SISSA, INFN"
]
] | Analogue gravity can be used to reproduce the phenomenology of quantum field theory in curved spacetime and in particular phenomena such as cosmological particle creation and Hawking radiation. In black hole physics, taking into account the backreaction of such effects on the metric requires an extension to semiclassic... |
2209.00374 | Quentin Henry | Quentin Henry, Sylvain Marsat, Mohammed Khalil | Spin contributions to the gravitational-waveform modes for spin-aligned
binaries at the 3.5PN order | 36 pages | null | 10.1103/PhysRevD.106.124018 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We complete the post-Newtonian (PN) prediction at the 3.5PN order for the
spin contributions to the gravitational waveforms emitted by inspiraling
compact binaries, in the case of quasi-circular, equatorial orbits, where both
spins are aligned with the orbital angular momentum. Using results from the
multipolar post-... | [
{
"created": "Thu, 1 Sep 2022 11:36:35 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Oct 2022 16:05:34 GMT",
"version": "v2"
}
] | 2022-12-21 | [
[
"Henry",
"Quentin",
""
],
[
"Marsat",
"Sylvain",
""
],
[
"Khalil",
"Mohammed",
""
]
] | We complete the post-Newtonian (PN) prediction at the 3.5PN order for the spin contributions to the gravitational waveforms emitted by inspiraling compact binaries, in the case of quasi-circular, equatorial orbits, where both spins are aligned with the orbital angular momentum. Using results from the multipolar post-Mi... |
0905.3673 | Santiago Esteban Perez Bergliaffa | Erico Goulart de Oliveira Costa, Santiago Esteban Perez Bergliaffa | A classification of the effective metric in nonlinear electrodynamics | Accepted for publication in Classical & Quantum Gravity | Class.Quant.Grav.26:135015,2009 | 10.1088/0264-9381/26/13/135015 | null | gr-qc hep-th physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that only two types of effective metrics are possible in certain
nonlinear electromagnetic theories. This is achieved by using the dependence of
the effective metric on the energy-momentum tensor of the background along with
the Segr\`e classification of the latter. Each of these forms is completely
determine... | [
{
"created": "Fri, 22 May 2009 12:49:40 GMT",
"version": "v1"
}
] | 2010-04-14 | [
[
"Costa",
"Erico Goulart de Oliveira",
""
],
[
"Bergliaffa",
"Santiago Esteban Perez",
""
]
] | We show that only two types of effective metrics are possible in certain nonlinear electromagnetic theories. This is achieved by using the dependence of the effective metric on the energy-momentum tensor of the background along with the Segr\`e classification of the latter. Each of these forms is completely determined ... |
gr-qc/0111066 | Max Karlovini | Max Karlovini | Axial perturbations of general spherically symmetric spacetimes | 16 pages, no figures, minor corrections | Class.Quant.Grav.19:2125-2140,2002 | 10.1088/0264-9381/19/8/305 | USITP 2001-9 | gr-qc | null | The aim of this paper is to present a governing equation for first order
axial metric perturbations of general, not necessarily static, spherically
symmetric spacetimes. Under the non-restrictive assumption of axisymmetric
perturbations, the governing equation is shown to be a two-dimensional wave
equation where the ... | [
{
"created": "Tue, 20 Nov 2001 19:14:54 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Mar 2002 18:38:21 GMT",
"version": "v2"
}
] | 2010-11-19 | [
[
"Karlovini",
"Max",
""
]
] | The aim of this paper is to present a governing equation for first order axial metric perturbations of general, not necessarily static, spherically symmetric spacetimes. Under the non-restrictive assumption of axisymmetric perturbations, the governing equation is shown to be a two-dimensional wave equation where the wa... |
2405.03471 | Junji Jia | Xinguang Ying and Junji Jia | Off-equatorial deflections and gravitational lensing. II. In general
stationary and axisymmetric spacetimes | 17 pages, 5 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we develop a general perturbative procedure to find the
off-equatorial plane deflections in the weak deflection limit in general
stationary and axisymmetric spacetimes satisfying some common variable
separation conditions. Deflections of both null and timelike rays with the
finite distance effect of the... | [
{
"created": "Mon, 6 May 2024 13:46:09 GMT",
"version": "v1"
}
] | 2024-05-07 | [
[
"Ying",
"Xinguang",
""
],
[
"Jia",
"Junji",
""
]
] | In this work, we develop a general perturbative procedure to find the off-equatorial plane deflections in the weak deflection limit in general stationary and axisymmetric spacetimes satisfying some common variable separation conditions. Deflections of both null and timelike rays with the finite distance effect of the s... |
1911.02900 | K\'aroly Zolt\'an Csuk\'as | K\'aroly Csuk\'as and Istv\'an R\'acz | Numerical investigations of the asymptotics of solutions to the
evolutionary form of the constraints | 42 page, 12 figures | K\'aroly Csuk\'as and Istv\'an R\'acz 2020 Class. Quantum Grav. 37
155006 | 10.1088/1361-6382/ab8fce | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Systematic numerical investigations of the asymptotics of near Schwarzschild
vacuum initial data sets is carried out by inspecting solutions to the
parabolic-hyperbolic and to the algebraic-hyperbolic forms of the constraints,
respectively. One of our most important findings is that the concept of near
Schwarzschild ... | [
{
"created": "Thu, 7 Nov 2019 13:43:19 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Apr 2020 23:36:49 GMT",
"version": "v2"
}
] | 2020-07-21 | [
[
"Csukás",
"Károly",
""
],
[
"Rácz",
"István",
""
]
] | Systematic numerical investigations of the asymptotics of near Schwarzschild vacuum initial data sets is carried out by inspecting solutions to the parabolic-hyperbolic and to the algebraic-hyperbolic forms of the constraints, respectively. One of our most important findings is that the concept of near Schwarzschild co... |
1012.4246 | Ahmet Baykal | Ahmet Baykal and \"Ozgur Delice | A Unified Approach to Variational Derivatives of Modified Gravitational
Actions | null | Class. Quantum Grav. 28 (2011) 015014 | 10.1088/0264-9381/28/1/015014 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Our main aim in this paper is to promote the coframe variational method as a
unified approach to derive field equations for any given gravitational action
containing the algebraic functions of the scalars constructed from the Riemann
curvature tensor and its contractions. We are able to derive a master equation
which... | [
{
"created": "Mon, 20 Dec 2010 07:06:16 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Baykal",
"Ahmet",
""
],
[
"Delice",
"Özgur",
""
]
] | Our main aim in this paper is to promote the coframe variational method as a unified approach to derive field equations for any given gravitational action containing the algebraic functions of the scalars constructed from the Riemann curvature tensor and its contractions. We are able to derive a master equation which e... |
2210.03670 | Alexey Toporensky | A. Toporensky and O.Zaslavskii | General radially moving references frames in the black hole background | 20 pages with 1 jpg figure | Eur. Phys. J. C (2023) 83:225 | 10.1140/epjc/s10052-023-11370-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider general radially moving frames realized in the background of
nonextremal black holes having causal structure similar to that of the
Schwarzschild metric. In doing so, we generalize the Lema\^{\i}tre approach,
constructing free-falling frames which are built from the reference particles
with an arbitrary s... | [
{
"created": "Fri, 7 Oct 2022 16:25:11 GMT",
"version": "v1"
}
] | 2023-03-29 | [
[
"Toporensky",
"A.",
""
],
[
"Zaslavskii",
"O.",
""
]
] | We consider general radially moving frames realized in the background of nonextremal black holes having causal structure similar to that of the Schwarzschild metric. In doing so, we generalize the Lema\^{\i}tre approach, constructing free-falling frames which are built from the reference particles with an arbitrary spe... |
0902.0368 | Neil J. Cornish | Tyson B. Littenberg and Neil J. Cornish | A Bayesian Approach to the Detection Problem in Gravitational Wave
Astronomy | 19 pages, 12 figures, revised to address referee's comments | Phys.Rev.D80:063007,2009 | 10.1103/PhysRevD.80.063007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The analysis of data from gravitational wave detectors can be divided into
three phases: search, characterization, and evaluation. The evaluation of the
detection - determining whether a candidate event is astrophysical in origin or
some artifact created by instrument noise - is a crucial step in the analysis.
The on... | [
{
"created": "Mon, 2 Feb 2009 21:00:28 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Jul 2009 17:54:14 GMT",
"version": "v2"
}
] | 2009-11-06 | [
[
"Littenberg",
"Tyson B.",
""
],
[
"Cornish",
"Neil J.",
""
]
] | The analysis of data from gravitational wave detectors can be divided into three phases: search, characterization, and evaluation. The evaluation of the detection - determining whether a candidate event is astrophysical in origin or some artifact created by instrument noise - is a crucial step in the analysis. The on-g... |
gr-qc/0206025 | Fabio Scardigli | Fabio Scardigli | Some Heuristic Semiclassical Derivations of the Planck Length, the
Hawking Effect and the Unruh Effect | LaTex file, 6 pages, no figures | NuovoCim.B110:1029-1034,1995 | 10.1007/BF02726152 | null | gr-qc | null | The formulae for Planck length, Hawking temperature and Unruh-Davies
temperature are derived by using only laws of classical physics together with
the Heisenberg principle. Besides, it is shown how the Hawking relation can be
deduced from the Unruh relation by means of the principle of equivalence; the
deep link betw... | [
{
"created": "Sun, 9 Jun 2002 15:00:11 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Scardigli",
"Fabio",
""
]
] | The formulae for Planck length, Hawking temperature and Unruh-Davies temperature are derived by using only laws of classical physics together with the Heisenberg principle. Besides, it is shown how the Hawking relation can be deduced from the Unruh relation by means of the principle of equivalence; the deep link betwee... |
gr-qc/0001079 | Jonathan Wilson | J. P. Wilson | Generalised hyperbolicity in space-times with conical singularities | 8 pages AmSTeX, 1 figure | Class.Quant.Grav. 17 (2000) 3199-3210 | 10.1088/0264-9381/17/16/308 | null | gr-qc | null | It is shown that the space-time with a conical singularity, which describes a
thin cosmic string, is hyperbolic in the sense that a unique H^1 solution
exists to the initial value problem for the wave equation with a certain class
of initial data.
| [
{
"created": "Tue, 25 Jan 2000 15:48:21 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Wilson",
"J. P.",
""
]
] | It is shown that the space-time with a conical singularity, which describes a thin cosmic string, is hyperbolic in the sense that a unique H^1 solution exists to the initial value problem for the wave equation with a certain class of initial data. |
1612.09511 | Ghanashyam Date | Ghanashyam Date and Sk Jahanur Hoque | Cosmological Horizon and the Quadrupole Formula in de Sitter Background | Version accepted for publication in phys. rev. D. This version is
slightly shortened, presentation is improved and 3 new references are added.
Results and conclusions are unchanged. 34 pages, 2 figures | Phys. Rev. D 96, 044026 (2017) | 10.1103/PhysRevD.96.044026 | IMSc/2016/12/07 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An important class of observables for gravitational waves consists of the
fluxes of energy, momentum and angular momentum carried away by them and are
well understood for weak gravitational waves in Minkowski background. In de
Sitter background, the future null infinity, $\mathcal{J}^+$, is space-like
which makes the... | [
{
"created": "Fri, 30 Dec 2016 15:43:36 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Apr 2017 06:49:56 GMT",
"version": "v2"
},
{
"created": "Fri, 11 Aug 2017 07:33:10 GMT",
"version": "v3"
}
] | 2017-08-24 | [
[
"Date",
"Ghanashyam",
""
],
[
"Hoque",
"Sk Jahanur",
""
]
] | An important class of observables for gravitational waves consists of the fluxes of energy, momentum and angular momentum carried away by them and are well understood for weak gravitational waves in Minkowski background. In de Sitter background, the future null infinity, $\mathcal{J}^+$, is space-like which makes the m... |
gr-qc/0010029 | Dzhunushaliev Vladimir | V.Dzhunushaliev | An effective model of the spacetime foam | 12 pg, talk given at the NATO ARW, 24-27 September, Kiev, Ukraina | null | null | null | gr-qc hep-th | null | An approximate model of the spacetime foam is offered in which each quantum
handle (wormhole) is a 5D wormhole-like solution. A spinor field is introduced
for an effective description of this foam. The topological handles of the
spacetime foam can be attached either to one space or connect two different
spaces. In th... | [
{
"created": "Mon, 9 Oct 2000 02:57:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dzhunushaliev",
"V.",
""
]
] | An approximate model of the spacetime foam is offered in which each quantum handle (wormhole) is a 5D wormhole-like solution. A spinor field is introduced for an effective description of this foam. The topological handles of the spacetime foam can be attached either to one space or connect two different spaces. In the ... |
1204.4220 | J\"org Hennig | J\"org Hennig | Fully pseudospectral time evolution and its application to 1+1
dimensional physical problems | 18 pages, 8 figures | J. Comput. Phys. 235, 322 (2013) | 10.1016/j.jcp.2012.10.040 | null | gr-qc physics.comp-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It was recently demonstrated that time-dependent PDE problems can numerically
be solved with a fully pseudospectral scheme, i.e. using spectral expansions
with respect to both spatial and time directions (Hennig and Ansorg, 2009
[15]). This was done with the example of simple scalar wave equations in
Minkowski spacet... | [
{
"created": "Wed, 18 Apr 2012 22:25:33 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Dec 2012 20:10:08 GMT",
"version": "v2"
}
] | 2012-12-18 | [
[
"Hennig",
"Jörg",
""
]
] | It was recently demonstrated that time-dependent PDE problems can numerically be solved with a fully pseudospectral scheme, i.e. using spectral expansions with respect to both spatial and time directions (Hennig and Ansorg, 2009 [15]). This was done with the example of simple scalar wave equations in Minkowski spacetim... |
1507.04266 | Christos Tsagas | Christos G. Tsagas and Miltiadis I. Kadiltzoglou | The deceleration parameter in `tilted' Friedmann universes | Typos corrected, published version | Phys.Rev.D92:043515,2015 | 10.1103/PhysRevD.92.043515 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Large-scale peculiar motions are believed to reflect the local inhomogeneity
and anisotropy of the universe, triggered by the ongoing process of structure
formation. As a result, realistic observers do not follow the smooth Hubble
flow but have a peculiar, `tilt', velocity relative to it. Our Local Group of
galaxies,... | [
{
"created": "Wed, 15 Jul 2015 15:46:15 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Jul 2015 15:08:01 GMT",
"version": "v2"
},
{
"created": "Thu, 30 Jul 2015 15:48:17 GMT",
"version": "v3"
},
{
"created": "Thu, 27 Aug 2015 19:57:55 GMT",
"version": "v4"
}
] | 2015-09-23 | [
[
"Tsagas",
"Christos G.",
""
],
[
"Kadiltzoglou",
"Miltiadis I.",
""
]
] | Large-scale peculiar motions are believed to reflect the local inhomogeneity and anisotropy of the universe, triggered by the ongoing process of structure formation. As a result, realistic observers do not follow the smooth Hubble flow but have a peculiar, `tilt', velocity relative to it. Our Local Group of galaxies, i... |
1907.00781 | Ricardo Gallego Torrom\'e | Ricardo Gallego Torrom\'e | Maximal acceleration geometries and spacetime curvature bounds | Minor corrections; some references added. 28 pages, no figures.
Accepted in International Journal of Geometric Methods in Modern Physics | null | 10.1142/S0219887820500607 | null | gr-qc hep-th math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A geometric framework for metrics of maximal acceleration which is applicable
to large proper accelerations is discussed, including a theory of connections
associated with the geometry of maximal acceleration. In such a framework it is
shown that the uniform bound on the proper maximal acceleration implies an
uniform... | [
{
"created": "Fri, 28 Jun 2019 09:59:28 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Dec 2019 12:58:58 GMT",
"version": "v2"
},
{
"created": "Fri, 27 Dec 2019 08:06:23 GMT",
"version": "v3"
},
{
"created": "Sun, 2 Feb 2020 13:25:38 GMT",
"version": "v4"
},
{
"cr... | 2020-07-17 | [
[
"Torromé",
"Ricardo Gallego",
""
]
] | A geometric framework for metrics of maximal acceleration which is applicable to large proper accelerations is discussed, including a theory of connections associated with the geometry of maximal acceleration. In such a framework it is shown that the uniform bound on the proper maximal acceleration implies an uniform b... |
2107.12141 | Hamid Shabani | Hooman Moradpour, Hamid Shabani, Amir Hadi Ziaie and Umesh Kumar
Sharma | Non-minimal coupling inspires the Dirac cosmological model | 8 pages, 3 figures | Eur. Phys. J. Plus 136, 731 (2021) | 10.1140/epjp/s13360-021-01713-4 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In the framework of the generalized Rastall theory (GRT), we study the
ability of a non-minimal coupling between geometry and matter fields in order
to provide a setting which allows for a variable G during the cosmic evolution.
In this regard, the compatibility of this theory with Dirac hypothesis on the
variations ... | [
{
"created": "Sun, 11 Jul 2021 06:15:11 GMT",
"version": "v1"
}
] | 2021-07-27 | [
[
"Moradpour",
"Hooman",
""
],
[
"Shabani",
"Hamid",
""
],
[
"Ziaie",
"Amir Hadi",
""
],
[
"Sharma",
"Umesh Kumar",
""
]
] | In the framework of the generalized Rastall theory (GRT), we study the ability of a non-minimal coupling between geometry and matter fields in order to provide a setting which allows for a variable G during the cosmic evolution. In this regard, the compatibility of this theory with Dirac hypothesis on the variations of... |
1707.08663 | Fabi\'an Chaverri-Miranda | Fabian Chaverri-Miranda, Francisco Frutos-Alfaro, Pedro Gomez-Ovarez,
Andree Oliva-Mercado | Innermost stable circular orbits of a Kerr-like Metric with Quadrupole | null | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The innermost stable circular orbit equation of a test particle is obtained
for an approximate Kerr-like spacetime with quadrupole moment. We derived the
effective potential for the radial coordinate by the Euler-Lagrange method.
This equation can be employed to measure the mass quadrupole by observational
means, bec... | [
{
"created": "Wed, 26 Jul 2017 23:24:10 GMT",
"version": "v1"
}
] | 2017-07-28 | [
[
"Chaverri-Miranda",
"Fabian",
""
],
[
"Frutos-Alfaro",
"Francisco",
""
],
[
"Gomez-Ovarez",
"Pedro",
""
],
[
"Oliva-Mercado",
"Andree",
""
]
] | The innermost stable circular orbit equation of a test particle is obtained for an approximate Kerr-like spacetime with quadrupole moment. We derived the effective potential for the radial coordinate by the Euler-Lagrange method. This equation can be employed to measure the mass quadrupole by observational means, becau... |
2303.07385 | Edgar Gasperin | Justin Feng and Edgar Gasperin | Linearised conformal Einstein field equations | 31 pages, 2 figures. Matches published version | null | 10.1088/1361-6382/ace606 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The linearisation of a second-order formulation of the conformal Einstein
field equations (CEFEs) in Generalised Harmonic Gauge (GHG), with trace-free
matter is derived. The linearised equations are obtained for a general
background and then particularised for the study linear perturbations around a
flat background -... | [
{
"created": "Mon, 13 Mar 2023 18:02:21 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Aug 2023 17:27:55 GMT",
"version": "v2"
}
] | 2023-08-09 | [
[
"Feng",
"Justin",
""
],
[
"Gasperin",
"Edgar",
""
]
] | The linearisation of a second-order formulation of the conformal Einstein field equations (CEFEs) in Generalised Harmonic Gauge (GHG), with trace-free matter is derived. The linearised equations are obtained for a general background and then particularised for the study linear perturbations around a flat background -- ... |
2005.08071 | Saurya Das | Saurya Das (University of Lethbridge) | There is no coincidence after all! | This essay received an Honorable Mention in the 2020 Gravity Research
Foundation Essay Competition | null | 10.1142/S0218271820430130 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that if Dark Matter is made up of light bosons, they form a
Bose-Einstein condensate in the early Universe. This in turn naturally induces
a Dark Energy of approximately equal density and exerting negative
pressure.This explains the so-called coincidence problem.
| [
{
"created": "Sat, 16 May 2020 19:28:32 GMT",
"version": "v1"
}
] | 2021-02-03 | [
[
"Das",
"Saurya",
"",
"University of Lethbridge"
]
] | We show that if Dark Matter is made up of light bosons, they form a Bose-Einstein condensate in the early Universe. This in turn naturally induces a Dark Energy of approximately equal density and exerting negative pressure.This explains the so-called coincidence problem. |
1110.2094 | Steven Hergt | Steven Hergt, Jan Steinhoff, and Gerhard Schaefer | Elimination of the spin supplementary condition in the effective field
theory approach to the post-Newtonian approximation | 42 pages, document changed to match published version, in press; Ann.
Phys. (N. Y.) (2012) | Annals of Physics 327:1494-1537,2012 | 10.1016/j.aop.2012.02.006 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present paper addresses open questions regarding the handling of the spin
supplementary condition within the effective field theory approach to the
post-Newtonian approximation. In particular it is shown how the covariant spin
supplementary condition can be eliminated at the level of the potential (which
is subtl... | [
{
"created": "Mon, 10 Oct 2011 16:16:17 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Nov 2011 12:00:24 GMT",
"version": "v2"
},
{
"created": "Tue, 20 Mar 2012 13:58:26 GMT",
"version": "v3"
}
] | 2012-05-21 | [
[
"Hergt",
"Steven",
""
],
[
"Steinhoff",
"Jan",
""
],
[
"Schaefer",
"Gerhard",
""
]
] | The present paper addresses open questions regarding the handling of the spin supplementary condition within the effective field theory approach to the post-Newtonian approximation. In particular it is shown how the covariant spin supplementary condition can be eliminated at the level of the potential (which is subtle ... |
gr-qc/0504109 | Piergiorgio Antonini | P. Antonini, M. Okhapkin, E. G\"okl\"u, S. Schiller | Test of constancy of speed of light with rotating cryogenic optical
resonators | 4 pages, 2 figures, accepted for publication Phys. Rev. A (2005) | Phys.Rev. A71 (2005) 050101 | 10.1103/PhysRevA.71.050101 | null | gr-qc | null | A test of Lorentz invariance for electromagnetic waves was performed by
comparing the resonance frequencies of two optical resonators as a function of
orientation in space. In terms of the Robertson-Mansouri-Sexl theory, we obtain
$\beta-\delta-1/2=(+0.5\pm 3\pm 0.7) E-10$, a ten-fold improvement compared to
the prev... | [
{
"created": "Fri, 22 Apr 2005 11:38:23 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Antonini",
"P.",
""
],
[
"Okhapkin",
"M.",
""
],
[
"Göklü",
"E.",
""
],
[
"Schiller",
"S.",
""
]
] | A test of Lorentz invariance for electromagnetic waves was performed by comparing the resonance frequencies of two optical resonators as a function of orientation in space. In terms of the Robertson-Mansouri-Sexl theory, we obtain $\beta-\delta-1/2=(+0.5\pm 3\pm 0.7) E-10$, a ten-fold improvement compared to the previo... |
2404.01837 | Muhammad Lawrence Pattersons | M. Lawrence Pattersons, Freddy Permana Zen, Hadyan Luthfan Prihadi,
Getbogi Hikmawan, Agus Suroso | Anisotropic Hartle-Thorne formalism in Rastall gravity | 5 pages | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this work, we extend the Hartle-Thorne formalism for anisotropic pressure
condition in Rastall gravity. As an implication, Tolman-Oppeneimer-Volkoff
equation in anisotropic form is modified. The equations in anisotropic
Hartle-Thorne formalism are also modified due to the appearance of $\lambda$,
i.e. a constant t... | [
{
"created": "Tue, 2 Apr 2024 10:49:01 GMT",
"version": "v1"
}
] | 2024-04-03 | [
[
"Pattersons",
"M. Lawrence",
""
],
[
"Zen",
"Freddy Permana",
""
],
[
"Prihadi",
"Hadyan Luthfan",
""
],
[
"Hikmawan",
"Getbogi",
""
],
[
"Suroso",
"Agus",
""
]
] | In this work, we extend the Hartle-Thorne formalism for anisotropic pressure condition in Rastall gravity. As an implication, Tolman-Oppeneimer-Volkoff equation in anisotropic form is modified. The equations in anisotropic Hartle-Thorne formalism are also modified due to the appearance of $\lambda$, i.e. a constant tha... |
2406.03196 | Eric Poisson | Tom Cadogan and Eric Poisson | Self-gravitating anisotropic fluid. III: Relativistic theory | 21 pages, 7 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is the third and final entry in a sequence of papers devoted to the
formulation of a theory of self-gravitating anisotropic fluids in Newtonian
gravity and general relativity. In this third paper we elevate the Newtonian
theory of the second paper to general relativity, and apply it to the
construction of relati... | [
{
"created": "Wed, 5 Jun 2024 12:25:50 GMT",
"version": "v1"
}
] | 2024-06-06 | [
[
"Cadogan",
"Tom",
""
],
[
"Poisson",
"Eric",
""
]
] | This is the third and final entry in a sequence of papers devoted to the formulation of a theory of self-gravitating anisotropic fluids in Newtonian gravity and general relativity. In this third paper we elevate the Newtonian theory of the second paper to general relativity, and apply it to the construction of relativi... |
2208.09739 | Saeed Rastgoo | Angel Garcia-Chung, Matthew F. Carney, James B. Mertens, Aliasghar
Parvizi, Saeed Rastgoo, Yaser Tavakoli | What do gravitational wave detectors say about polymer quantum effects? | 25 pages, 5 figures, v2: a few new comments added, matches the JCAP
published version | JCAP 11 (2022) 054 | 10.1088/1475-7516/2022/11/054 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the expected response of detector arms of gravitational wave
observatories to polymerized gravitational waves. The mathematical and
theoretical features of these waves were discussed in our previous work. In the
present manuscript, we find both perturbative analytical, and full
nonperturbative numerical so... | [
{
"created": "Sat, 20 Aug 2022 19:55:07 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Nov 2022 18:56:55 GMT",
"version": "v2"
}
] | 2022-11-29 | [
[
"Garcia-Chung",
"Angel",
""
],
[
"Carney",
"Matthew F.",
""
],
[
"Mertens",
"James B.",
""
],
[
"Parvizi",
"Aliasghar",
""
],
[
"Rastgoo",
"Saeed",
""
],
[
"Tavakoli",
"Yaser",
""
]
] | We compute the expected response of detector arms of gravitational wave observatories to polymerized gravitational waves. The mathematical and theoretical features of these waves were discussed in our previous work. In the present manuscript, we find both perturbative analytical, and full nonperturbative numerical solu... |
gr-qc/9706056 | Peter Leifer | Peter Leifer | Inertia as the ``Threshold of Elasticity'' of Quantum States | 14 pages, LaTeX, submitted for publication | Found.Phys.Lett. 11 (1998) 233-249 | null | null | gr-qc | null | A quantum mechanism of the inertia generation has been proposed. The
threshold of the parametric instability of ``goemetric'' Goldstone modes is
treated as a rest mass.
| [
{
"created": "Wed, 18 Jun 1997 07:26:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Leifer",
"Peter",
""
]
] | A quantum mechanism of the inertia generation has been proposed. The threshold of the parametric instability of ``goemetric'' Goldstone modes is treated as a rest mass. |
2105.11041 | Sebasti\'an N\'ajera Valencia | Sebasti\'an N\'ajera, Aldo Gamboa, Alejandro Aguilar-Nieto, Celia
Escamilla-Rivera | On Negative Mass Cosmology in General Relativity | 4 pages, Version accepted in Astronomy & Astrophysics as letter | A&A 651, L13 (2021) | 10.1051/0004-6361/202141394 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | In this Letter we present strong arguments in favour of thoroughly revising
the negative mass cosmology (NMC), which has been proposed as a simple
alternative explanation of dark energy and dark matter effects, within the
framework of General Relativity. We show that there are various physical
predictions in this mod... | [
{
"created": "Sun, 23 May 2021 23:20:31 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Jul 2021 00:54:20 GMT",
"version": "v2"
}
] | 2021-08-04 | [
[
"Nájera",
"Sebastián",
""
],
[
"Gamboa",
"Aldo",
""
],
[
"Aguilar-Nieto",
"Alejandro",
""
],
[
"Escamilla-Rivera",
"Celia",
""
]
] | In this Letter we present strong arguments in favour of thoroughly revising the negative mass cosmology (NMC), which has been proposed as a simple alternative explanation of dark energy and dark matter effects, within the framework of General Relativity. We show that there are various physical predictions in this model... |
2301.06976 | Sergey Bondarenko | Sergey Bondarenko, Victor De La Hoz-Coronell | Spinor fields, CPTM symmetry and smallness of cosmological constant in
framework of extended manifold | 31 pages | null | null | null | gr-qc cond-mat.other hep-th | http://creativecommons.org/licenses/by/4.0/ | A model of an extended manifold for the Dirac spinor field is considered. Two
Lagrangians related by CPTM (charge-parity-time-mass) symmetry are constructed
for a pair of the Dirac spinor fields with each spinor field defined in a
separate manifold. An interaction between the matter fields in the manifolds is
introdu... | [
{
"created": "Tue, 17 Jan 2023 15:59:40 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Jan 2023 10:39:05 GMT",
"version": "v2"
}
] | 2023-01-20 | [
[
"Bondarenko",
"Sergey",
""
],
[
"De La Hoz-Coronell",
"Victor",
""
]
] | A model of an extended manifold for the Dirac spinor field is considered. Two Lagrangians related by CPTM (charge-parity-time-mass) symmetry are constructed for a pair of the Dirac spinor fields with each spinor field defined in a separate manifold. An interaction between the matter fields in the manifolds is introduce... |
gr-qc/0302071 | Simonetta Frittelli | Simonetta Frittelli (Duquesne University) and Roberto Gomez
(Pittsburgh Supercomputing Center) | Einstein boundary conditions for the 3+1 Einstein equations | Revtex 4, 6 pages, text and references added, typos corrected, to
appear in Phys. Rev. D | Phys.Rev. D68 (2003) 044014 | 10.1103/PhysRevD.68.044014 | null | gr-qc | null | In the 3+1 framework of the Einstein equations for the case of vanishing
shift vector and arbitrary lapse, we calculate explicitly the four boundary
equations arising from the vanishing of the projection of the Einstein tensor
along the normal to the boundary surface of the initial-boundary value problem.
Such condit... | [
{
"created": "Mon, 17 Feb 2003 21:01:39 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Aug 2003 15:38:00 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Frittelli",
"Simonetta",
"",
"Duquesne University"
],
[
"Gomez",
"Roberto",
"",
"Pittsburgh Supercomputing Center"
]
] | In the 3+1 framework of the Einstein equations for the case of vanishing shift vector and arbitrary lapse, we calculate explicitly the four boundary equations arising from the vanishing of the projection of the Einstein tensor along the normal to the boundary surface of the initial-boundary value problem. Such conditio... |
2206.03512 | Luis Alex Huahuachampi Mamani | Luis A. H. Mamani, Angel D. D. Masa, Lucas Timotheo Sanches and Vilson
T. Zanchin | Revisiting the quasinormal modes of the Schwarzschild black hole:
Numerical analysis | 15 pages, 4 figures | null | 10.1140/epjc/s10052-022-10865-1 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We revisit the problem of calculating the quasinormal modes of spin $0$,
$1/2$, $1$, $3/2$, $2$, and spin $5/2$ fields in the asymptotically flat
Schwarzschild black hole spacetime. Our aim is to investigate the problem from
the numerical point of view, by comparing some numerical methods available in
the literature ... | [
{
"created": "Tue, 7 Jun 2022 18:00:10 GMT",
"version": "v1"
}
] | 2022-10-26 | [
[
"Mamani",
"Luis A. H.",
""
],
[
"Masa",
"Angel D. D.",
""
],
[
"Sanches",
"Lucas Timotheo",
""
],
[
"Zanchin",
"Vilson T.",
""
]
] | We revisit the problem of calculating the quasinormal modes of spin $0$, $1/2$, $1$, $3/2$, $2$, and spin $5/2$ fields in the asymptotically flat Schwarzschild black hole spacetime. Our aim is to investigate the problem from the numerical point of view, by comparing some numerical methods available in the literature an... |
2406.01692 | Kyriakos Destounis Dr. | Romeo Felice Rosato, Kyriakos Destounis and Paolo Pani | Ringdown stability: greybody factors as stable gravitational-wave
observables | 12 pages, 11 figures, references updated, submitted version | null | null | null | gr-qc astro-ph.HE hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | The quasinormal mode spectrum of black holes plays a crucial role in the
modelling of post-merger ringdown signals. However, the spectrum is extremely
sensitive to small deformations of the system and describes the linear response
only in a certain (not precisely defined) timeframe after the merger. We argue
here tha... | [
{
"created": "Mon, 3 Jun 2024 18:00:06 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jun 2024 10:33:44 GMT",
"version": "v2"
}
] | 2024-06-14 | [
[
"Rosato",
"Romeo Felice",
""
],
[
"Destounis",
"Kyriakos",
""
],
[
"Pani",
"Paolo",
""
]
] | The quasinormal mode spectrum of black holes plays a crucial role in the modelling of post-merger ringdown signals. However, the spectrum is extremely sensitive to small deformations of the system and describes the linear response only in a certain (not precisely defined) timeframe after the merger. We argue here that ... |
1811.00047 | Shao-Wen Wei | Shao-Wen Wei, Yu-Xiao Liu, Robert B. Mann | Intrinsic curvature and topology of shadows in Kerr spacetime | 6 pages, 6 figures. Accepted for publication as a Rapid Communication
in Physical Review D | Phys. Rev. D 99, 041303 (2019) | 10.1103/PhysRevD.99.041303 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | From the viewpoint of differential geometry and topology, we investigate the
characterization of the shadows in a Kerr spacetime. Two new quantities, the
length of the shadow boundary and the local curvature radius are introduced.
Each shadow can be uniquely determined by these two quantities. For the black
hole case... | [
{
"created": "Wed, 31 Oct 2018 18:19:59 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Jan 2019 21:19:19 GMT",
"version": "v2"
},
{
"created": "Mon, 11 Feb 2019 19:57:00 GMT",
"version": "v3"
}
] | 2019-02-13 | [
[
"Wei",
"Shao-Wen",
""
],
[
"Liu",
"Yu-Xiao",
""
],
[
"Mann",
"Robert B.",
""
]
] | From the viewpoint of differential geometry and topology, we investigate the characterization of the shadows in a Kerr spacetime. Two new quantities, the length of the shadow boundary and the local curvature radius are introduced. Each shadow can be uniquely determined by these two quantities. For the black hole case, ... |
gr-qc/0210051 | Aleksandar Mikovic | A. Mikovic | Spin Foam Models of Yang-Mills Theory Coupled to Gravity | 10 pages | Class.Quant.Grav.20:239-246,2003 | 10.1088/0264-9381/20/1/317 | null | gr-qc hep-th | null | We construct a spin foam model of Yang-Mills theory coupled to gravity by
using a discretized path integral of the BF theory with polynomial interactions
and the Barret-Crane ansatz. In the Euclidian gravity case we obtain a vertex
amplitude which is determined by a vertex operator acting on a simple spin
network fun... | [
{
"created": "Wed, 16 Oct 2002 14:41:24 GMT",
"version": "v1"
}
] | 2009-01-16 | [
[
"Mikovic",
"A.",
""
]
] | We construct a spin foam model of Yang-Mills theory coupled to gravity by using a discretized path integral of the BF theory with polynomial interactions and the Barret-Crane ansatz. In the Euclidian gravity case we obtain a vertex amplitude which is determined by a vertex operator acting on a simple spin network funct... |
1902.03106 | Joan Josep Ferrando | Bartolom\'e Coll, Joan Josep Ferrando and Juan Antonio S\'aez | A hydrodynamic approach to the classical ideal gas | 12 pages, no figures, submitted to Physical Review D | Phys. Rev. D 99, 084035 (2019) | 10.1103/PhysRevD.99.084035 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The necessary and sufficient condition for a conservative perfect fluid
energy tensor to be the energetic evolution of a classical ideal gas is
obtained. This condition forces the square of the speed of sound to have the
form $c_s^2 = \frac{\gamma p}{\rho+p}$ in terms of the hydrodynamic quantities,
energy density $\... | [
{
"created": "Fri, 8 Feb 2019 14:38:15 GMT",
"version": "v1"
}
] | 2019-04-24 | [
[
"Coll",
"Bartolomé",
""
],
[
"Ferrando",
"Joan Josep",
""
],
[
"Sáez",
"Juan Antonio",
""
]
] | The necessary and sufficient condition for a conservative perfect fluid energy tensor to be the energetic evolution of a classical ideal gas is obtained. This condition forces the square of the speed of sound to have the form $c_s^2 = \frac{\gamma p}{\rho+p}$ in terms of the hydrodynamic quantities, energy density $\rh... |
2004.01593 | Abdulla Al Mamon | Abdulla Al Mamon, Amir Hadi Ziaie and Kazuharu Bamba | A Generalized Interacting Tsallis Holographic Dark Energy Model and its
thermodynamic implications | v3: minor corrections, published in EPJC | Eur. Phys. J. C 80, 974 (2020) | 10.1140/epjc/s10052-020-08546-y | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The paper deals with a theoretical model for interacting Tsallis holographic
dark energy (THDE) whose infrared (IR) cut-off scale is set by the Hubble
length. The interaction $Q$ between the dark sectors (dark energy and
pressureless dark matter) of the universe has been assumed to be
non-gravitational in nature. The... | [
{
"created": "Fri, 3 Apr 2020 14:35:07 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Jul 2020 09:54:50 GMT",
"version": "v2"
},
{
"created": "Sun, 25 Oct 2020 13:14:57 GMT",
"version": "v3"
}
] | 2020-10-27 | [
[
"Mamon",
"Abdulla Al",
""
],
[
"Ziaie",
"Amir Hadi",
""
],
[
"Bamba",
"Kazuharu",
""
]
] | The paper deals with a theoretical model for interacting Tsallis holographic dark energy (THDE) whose infrared (IR) cut-off scale is set by the Hubble length. The interaction $Q$ between the dark sectors (dark energy and pressureless dark matter) of the universe has been assumed to be non-gravitational in nature. The f... |
gr-qc/0307107 | Claudio Benedito Silva Furtado | J. G. de Assis, V. B. Bezerra and C. Furtado | Loop variables and gravitational Berry's quantum phase in the space-time
of a rotating massive body | 8 pages, iopart style | null | null | null | gr-qc | null | In this paper we compute the holonomies along curves in the gravitational
field of a slowly rotating massive body. We use our results to study the
gravitational analogue of Aharanov-Bohm effect in this space-time. We also
investigate the behaviour of a scalar quantum particle in this space-time and
determine Berry's ... | [
{
"created": "Thu, 24 Jul 2003 19:09:12 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"de Assis",
"J. G.",
""
],
[
"Bezerra",
"V. B.",
""
],
[
"Furtado",
"C.",
""
]
] | In this paper we compute the holonomies along curves in the gravitational field of a slowly rotating massive body. We use our results to study the gravitational analogue of Aharanov-Bohm effect in this space-time. We also investigate the behaviour of a scalar quantum particle in this space-time and determine Berry's qu... |
2201.02622 | Narges Rashidi | Narges Rashidi | A Tachyon Field around the Black Hole | 20 Pages, 12 Figures, Accepted for publication in International
Journal of Modern Physics D | null | 10.1142/S0218271821501261 | null | gr-qc hep-ph hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | We study the effects of the presence of the tachyon field around the black
hole. We show that in presence of the tachyon field, unlike the ordinary
canonical scalar field, the time evolution of the black hole mass depends on
the potential of this field. By considering several types of potential, we
study the behavior... | [
{
"created": "Fri, 7 Jan 2022 08:40:09 GMT",
"version": "v1"
}
] | 2022-01-11 | [
[
"Rashidi",
"Narges",
""
]
] | We study the effects of the presence of the tachyon field around the black hole. We show that in presence of the tachyon field, unlike the ordinary canonical scalar field, the time evolution of the black hole mass depends on the potential of this field. By considering several types of potential, we study the behavior o... |
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