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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2110.09230 | Ramkumar Radhakrishnan | Ramkumar Radhakrishnan | A study on the Friedmann like Universe with Torsion using Noether
Symmetry | null | Modern Physics Letters A Vol. 35, No. 6 (2020) 2050027 | 10.1142/S0217732320500273 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper deals with the symmetry analysis of the Einstein Cartan theory
which is an extension of the General Relativity and it accounts for the
space-time torsion. We begin by applying Noether Theorem to the Lagrangian of
the FRW type cosmology with torsion and choose a point transformation:
$(a,\phi,N)\rightarrow(... | [
{
"created": "Thu, 7 Oct 2021 14:40:39 GMT",
"version": "v1"
}
] | 2021-10-20 | [
[
"Radhakrishnan",
"Ramkumar",
""
]
] | This paper deals with the symmetry analysis of the Einstein Cartan theory which is an extension of the General Relativity and it accounts for the space-time torsion. We begin by applying Noether Theorem to the Lagrangian of the FRW type cosmology with torsion and choose a point transformation: $(a,\phi,N)\rightarrow(u,... |
gr-qc/9803007 | Sean Hayward | Sean A. Hayward | Relativistic thermodynamics | 26 pages, plain Tex, presentational changes | null | null | null | gr-qc | null | A generally relativistic theory of thermodynamics is developed, based on four
main physical principles: heat is a local form of energy, therefore described
by a thermal energy tensor; conservation of mass, equivalent to conservation of
heat, or the local first law; entropy is a local current; and non-destruction
of e... | [
{
"created": "Mon, 2 Mar 1998 05:55:50 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Jan 1999 06:12:42 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Hayward",
"Sean A.",
""
]
] | A generally relativistic theory of thermodynamics is developed, based on four main physical principles: heat is a local form of energy, therefore described by a thermal energy tensor; conservation of mass, equivalent to conservation of heat, or the local first law; entropy is a local current; and non-destruction of ent... |
gr-qc/9905064 | Masaru shibata | Masaru Shibata and Misao Sasaki | Black hole formation in the Friedmann universe: Formulation and
computation in numerical relativity | 12 pages, to be published in Phys. Rev. D | Phys.Rev.D60:084002,1999 | 10.1103/PhysRevD.60.084002 | OU-TAP 93 | gr-qc | null | We study formation of black holes in the Friedmann universe. We present a
formulation of the Einstein equations under the constant mean curvature
time-slicing condition. Our formalism not only gives us the analytic solution
of the perturbation equations for non-linear density and metric fluctuations on
superhorizon s... | [
{
"created": "Tue, 18 May 1999 22:38:56 GMT",
"version": "v1"
}
] | 2009-10-09 | [
[
"Shibata",
"Masaru",
""
],
[
"Sasaki",
"Misao",
""
]
] | We study formation of black holes in the Friedmann universe. We present a formulation of the Einstein equations under the constant mean curvature time-slicing condition. Our formalism not only gives us the analytic solution of the perturbation equations for non-linear density and metric fluctuations on superhorizon sca... |
gr-qc/0512131 | Kuiroukidis | K. Kleidis, A. Kuiroukidis, D. B. Papadopoulos and L. Vlahos | Magnetohydrodynamics and Plasma Cosmology | 9 pages, RevTeX, To appear in the Proceedings of the Peyresq X
Meeting, IJTP Conference Series | Int.J.Theor.Phys.46:2283-2298,2007 | 10.1007/s10773-007-9346-x | null | gr-qc | null | We study the linear magnetohydrodynamic (MHD) equations, both in the
Newtonian and the general-relativistic limit, as regards a viscous magnetized
fluid of finite conductivity and discuss instability criteria. In addition, we
explore the excitation of cosmological perturbations in anisotropic spacetimes,
in the prese... | [
{
"created": "Thu, 22 Dec 2005 12:09:52 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kleidis",
"K.",
""
],
[
"Kuiroukidis",
"A.",
""
],
[
"Papadopoulos",
"D. B.",
""
],
[
"Vlahos",
"L.",
""
]
] | We study the linear magnetohydrodynamic (MHD) equations, both in the Newtonian and the general-relativistic limit, as regards a viscous magnetized fluid of finite conductivity and discuss instability criteria. In addition, we explore the excitation of cosmological perturbations in anisotropic spacetimes, in the presenc... |
gr-qc/9612007 | Patricio Anibal Letelier | D.V. Gal'tsov and P.S. Letelier | Ehlers-Harrison transformations and black holes in Dilaton-Axion Gravity
with multiple vector fields | 37 pages, Latex | Phys.Rev.D55:3580-3592,1997 | 10.1103/PhysRevD.55.3580 | null | gr-qc | null | Dilaton-axion gravity with $p U(1)$ vector fields is studied on space-times
admitting a timelike Killing vector field. Three-dimensional sigma-model is
derived in terms of K\"ahler geometry, and holomorphic representation of the
SO(2,2+p) global symmetry is constructed. A general static black hole solution
depending ... | [
{
"created": "Mon, 2 Dec 1996 19:51:43 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Gal'tsov",
"D. V.",
""
],
[
"Letelier",
"P. S.",
""
]
] | Dilaton-axion gravity with $p U(1)$ vector fields is studied on space-times admitting a timelike Killing vector field. Three-dimensional sigma-model is derived in terms of K\"ahler geometry, and holomorphic representation of the SO(2,2+p) global symmetry is constructed. A general static black hole solution depending on... |
1712.01215 | Supriya Pan | Supriya Pan | Exact solutions, finite time singularities and non-singular universe
models from a variety of $\Lambda(t)$ cosmologies | 12 pages, some typos corrected, online ready in Mod. Phys. Lett. A | Mod. Phys. Lett. A 33, No. 1 (2018) 1850003 | 10.1142/S0217732318500037 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmological models with time dependent $\Lambda$ (read as $\Lambda (t)$)
have been investigated widely in the literature. Models that solve background
dynamics analytically, are of special interest. Additionally, the allowance of
past or future singularities at finite cosmic time in a specific model signals
for a ge... | [
{
"created": "Mon, 4 Dec 2017 17:42:43 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Jan 2018 12:46:30 GMT",
"version": "v2"
}
] | 2018-01-08 | [
[
"Pan",
"Supriya",
""
]
] | Cosmological models with time dependent $\Lambda$ (read as $\Lambda (t)$) have been investigated widely in the literature. Models that solve background dynamics analytically, are of special interest. Additionally, the allowance of past or future singularities at finite cosmic time in a specific model signals for a gene... |
gr-qc/9605064 | Roberto De Pietri | Roberto De Pietri (University of Parma) | On the relation between the connection and the loop representation of
quantum gravity | 19 pages, ioplppt.sty and epsfig.sty | Class.Quant.Grav. 14 (1997) 53-70 | 10.1088/0264-9381/14/1/009 | University of Parma preprint UPRF-96-466 | gr-qc | null | Using Penrose binor calculus for $SU(2)$ ($SL(2,C)$) tensor expressions, a
graphical method for the connection representation of Euclidean Quantum Gravity
(real connection) is constructed. It is explicitly shown that: {\it (i)} the
recently proposed scalar product in the loop-representation coincide with the
Ashtekar... | [
{
"created": "Tue, 28 May 1996 18:11:54 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"De Pietri",
"Roberto",
"",
"University of Parma"
]
] | Using Penrose binor calculus for $SU(2)$ ($SL(2,C)$) tensor expressions, a graphical method for the connection representation of Euclidean Quantum Gravity (real connection) is constructed. It is explicitly shown that: {\it (i)} the recently proposed scalar product in the loop-representation coincide with the Ashtekar-L... |
1902.01689 | Debabrata Deb | Sourav Roy Chowdhury, Debabrata Deb, Saibal Ray, Farook Rahaman and B.
K. Guha | Charged anisotropic strange stars in Finslerian geometry | 21 pages, 13 figures, 4 tables | Eur.Phys.J.C Vol: 79, Article number: 547 (2019) | 10.1140/epjc/s10052-019-7054-3 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We investigate a simplified model for the strange stars in the framework of
Finslerian spacetime geometry, composed of charged fluid. It is considered that
the fluid consisting of three flavor quarks including a small amount of
non-interacting electrons to maintain the chemical equilibrium and assumed that
the fluid ... | [
{
"created": "Fri, 1 Feb 2019 22:28:27 GMT",
"version": "v1"
}
] | 2021-06-22 | [
[
"Chowdhury",
"Sourav Roy",
""
],
[
"Deb",
"Debabrata",
""
],
[
"Ray",
"Saibal",
""
],
[
"Rahaman",
"Farook",
""
],
[
"Guha",
"B. K.",
""
]
] | We investigate a simplified model for the strange stars in the framework of Finslerian spacetime geometry, composed of charged fluid. It is considered that the fluid consisting of three flavor quarks including a small amount of non-interacting electrons to maintain the chemical equilibrium and assumed that the fluid is... |
2103.09612 | Liang-Bi Wu | Li-Ming Cao and Liang-Bi Wu | On the "Einstein-Gauss-Bonnet Gravity in Four Dimension" | revtex, 5 pages, no figures | null | 10.1140/epjc/s10052-022-10079-5 | ICTS-USTC/PCFT-21-11 | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | To ensure the existence of a well defined linearized gravitational wave
equation, we show that the spacetimes in the so-called "Einstein-Gauss-Bonnet
gravity in four dimension" have to be locally conformally flat.
| [
{
"created": "Wed, 17 Mar 2021 12:56:04 GMT",
"version": "v1"
}
] | 2022-02-23 | [
[
"Cao",
"Li-Ming",
""
],
[
"Wu",
"Liang-Bi",
""
]
] | To ensure the existence of a well defined linearized gravitational wave equation, we show that the spacetimes in the so-called "Einstein-Gauss-Bonnet gravity in four dimension" have to be locally conformally flat. |
1510.02016 | Kuantay Boshkayev | Kuantay Boshkayev, Hernando Quevedo, Marzhan Abutalip, Zhanerke
Kalymova and Sharara Suleymanova | Geodesics in the field of a rotating deformed gravitational source | submitted to IJMPA, 10 pages, 3 figures | null | 10.1142/S0217751X16410062 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate equatorial geodesics in the gravitational field of a rotating
and deformed source described by the approximate Hartle-Thorne metric. In the
case of massive particles, we derive within the same approximation analytic
expressions for the orbital angular velocity, the specific angular momentum and
energy,... | [
{
"created": "Wed, 7 Oct 2015 16:33:09 GMT",
"version": "v1"
}
] | 2016-02-03 | [
[
"Boshkayev",
"Kuantay",
""
],
[
"Quevedo",
"Hernando",
""
],
[
"Abutalip",
"Marzhan",
""
],
[
"Kalymova",
"Zhanerke",
""
],
[
"Suleymanova",
"Sharara",
""
]
] | We investigate equatorial geodesics in the gravitational field of a rotating and deformed source described by the approximate Hartle-Thorne metric. In the case of massive particles, we derive within the same approximation analytic expressions for the orbital angular velocity, the specific angular momentum and energy, a... |
1801.10176 | Ramon Masachs | Oscar J.C. Dias, Ramon Masachs | Charged black hole bombs in a Minkowski cavity | 31 pages, 9 Figures | null | 10.1088/1361-6382/aad70b | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Press and Teukolsky famously introduced the concept of a black hole bomb
system: a scalar field scattering a Kerr black hole confined inside a mirror
undergoes superradiant amplification that keeps repeating due to the reflecting
boundary conditions at the mirror. A similar charged black hole bomb system
exists if we... | [
{
"created": "Tue, 30 Jan 2018 19:02:08 GMT",
"version": "v1"
}
] | 2018-08-29 | [
[
"Dias",
"Oscar J. C.",
""
],
[
"Masachs",
"Ramon",
""
]
] | Press and Teukolsky famously introduced the concept of a black hole bomb system: a scalar field scattering a Kerr black hole confined inside a mirror undergoes superradiant amplification that keeps repeating due to the reflecting boundary conditions at the mirror. A similar charged black hole bomb system exists if we h... |
1611.00738 | Vasilis Oikonomou | S.D. Odintsov, V.K. Oikonomou | Inverse Symmetric Inflationary Attractors | Affiliation is corrected | null | 10.1088/1361-6382/aa69a8 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a class of inflationary potentials which are invariant under a
special symmetry, which depends on the parameters of the models. As we show, in
certain limiting cases, the inverse symmetric potentials are qualitatively
similar to the $\alpha$-attractors models, since the resulting observational
indices are ... | [
{
"created": "Wed, 2 Nov 2016 19:31:58 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Mar 2017 15:08:31 GMT",
"version": "v2"
},
{
"created": "Wed, 8 Nov 2017 12:31:03 GMT",
"version": "v3"
}
] | 2017-11-09 | [
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K.",
""
]
] | We present a class of inflationary potentials which are invariant under a special symmetry, which depends on the parameters of the models. As we show, in certain limiting cases, the inverse symmetric potentials are qualitatively similar to the $\alpha$-attractors models, since the resulting observational indices are id... |
1904.07630 | Yakov Shnir | J. Kunz, I. Perapechka, Ya. Shnir | Kerr black holes with parity-odd scalar hair | 14 pages, 5 figures | Phys. Rev. D 100, 064032 (2019) | 10.1103/PhysRevD.100.064032 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study Kerr black holes with synchronised non-trivial parity-odd massive
scalar hair in four dimensional asymptotically flat space-time. These axially
symmetric stationary spinning solutions of the minimally coupled
Einstein-Klein-Gordon theory provide yet another example of bound states in
synchronous rotation wit... | [
{
"created": "Tue, 16 Apr 2019 12:55:37 GMT",
"version": "v1"
}
] | 2019-09-25 | [
[
"Kunz",
"J.",
""
],
[
"Perapechka",
"I.",
""
],
[
"Shnir",
"Ya.",
""
]
] | We study Kerr black holes with synchronised non-trivial parity-odd massive scalar hair in four dimensional asymptotically flat space-time. These axially symmetric stationary spinning solutions of the minimally coupled Einstein-Klein-Gordon theory provide yet another example of bound states in synchronous rotation with ... |
1411.2892 | Edward Glass | J.P. Krisch and E.N. Glass | Relativistic Bessel Cylinders | null | J. Math. Phys. vol 55, 102502 (2014) | 10.1063/1.4898770 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A set of cylindrical solutions to Einstein's field equations for power law
densities is described. The solutions have a Bessel function contribution to
the metric. For matter cylinders regular on axis, the first two solutions are
the constant density Gott-Hiscock string and a cylinder with a metric Airy
function. All... | [
{
"created": "Tue, 11 Nov 2014 17:25:16 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Krisch",
"J. P.",
""
],
[
"Glass",
"E. N.",
""
]
] | A set of cylindrical solutions to Einstein's field equations for power law densities is described. The solutions have a Bessel function contribution to the metric. For matter cylinders regular on axis, the first two solutions are the constant density Gott-Hiscock string and a cylinder with a metric Airy function. All m... |
gr-qc/0301078 | Vitor Cardoso | Vitor Cardoso, Jose' P. S. Lemos | Quasinormal modes of the near extremal Schwarzschild-de Sitter black
hole | REVTEX4, 4 pages. Minor improvements and references added | Phys.Rev.D67:084020,2003 | 10.1103/PhysRevD.67.084020 | null | gr-qc hep-ph hep-th | null | We present an exact expression for the quasinormal modes of scalar,
electromagnetic and gravitational perturbations of a near extremal
Scwarzschild-de Sitter black hole and we show why a previous approximation
holds exactly in this near extremal regime. In particular, our results give the
asymptotic behavior of the q... | [
{
"created": "Tue, 21 Jan 2003 15:30:28 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Feb 2003 19:19:14 GMT",
"version": "v2"
}
] | 2016-08-31 | [
[
"Cardoso",
"Vitor",
""
],
[
"Lemos",
"Jose' P. S.",
""
]
] | We present an exact expression for the quasinormal modes of scalar, electromagnetic and gravitational perturbations of a near extremal Scwarzschild-de Sitter black hole and we show why a previous approximation holds exactly in this near extremal regime. In particular, our results give the asymptotic behavior of the qua... |
1005.5217 | Subenoy Chakraborty | Nairwita Mazumder, Subenoy Chakraborty | Scalar-Tensor Theory of Gravity and Generalized Second Law of
Thermodynamics on the Event Horizon | 8 pages | Astrophys.Space Sci.332:509-513,2011 | 10.1007/s10509-010-0532-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In blackhole physics, the second law of thermodynamics is generally valid
whether the blackhole is a static or a non-static one. Considering the universe
as a thermodynamical system the second law of blackhole dynamics extends to the
non-negativity of the sum of the entropy of the matter and the horizon, known
as gen... | [
{
"created": "Fri, 28 May 2010 04:52:23 GMT",
"version": "v1"
}
] | 2011-03-14 | [
[
"Mazumder",
"Nairwita",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | In blackhole physics, the second law of thermodynamics is generally valid whether the blackhole is a static or a non-static one. Considering the universe as a thermodynamical system the second law of blackhole dynamics extends to the non-negativity of the sum of the entropy of the matter and the horizon, known as gener... |
2401.07605 | Abbas Sherif | Gareth Amery, Peter K S Dunsby, Abbas M Sherif | Gradient conformal stationarity and the CMC condition in LRS spacetimes | 26 pages, no figure, comments welcome | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study the existence of gradient conformal Killing vectors (CKVs) in LRS
spacetimes, and investigate some implications for the evolutionary character of
marginally outer trapped surfaces. We first study existence of gradient CKVs
via the obtention of a relationship between the Ricci curvature and the
gradient of th... | [
{
"created": "Mon, 15 Jan 2024 11:29:59 GMT",
"version": "v1"
}
] | 2024-01-17 | [
[
"Amery",
"Gareth",
""
],
[
"Dunsby",
"Peter K S",
""
],
[
"Sherif",
"Abbas M",
""
]
] | We study the existence of gradient conformal Killing vectors (CKVs) in LRS spacetimes, and investigate some implications for the evolutionary character of marginally outer trapped surfaces. We first study existence of gradient CKVs via the obtention of a relationship between the Ricci curvature and the gradient of the ... |
gr-qc/0703105 | Guendelman Eduardo I | E.I. Guendelman | Child universes UV regularization? | 6 pages, RevTex, discussion to the maximum curvature hypothesis added | Int.J.Mod.Phys.D17:551-555,2008 | 10.1142/S0218271808012243 | null | gr-qc | null | It is argued that high energy density excitations, responsible for UV
divergences in quantum field theories, including quantum gravity, are likely to
be the source of child universes which carry them out of the original space
time. This decoupling prevents these high UV excitations from having any
influence on physic... | [
{
"created": "Wed, 21 Mar 2007 06:38:44 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Mar 2007 10:46:54 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Guendelman",
"E. I.",
""
]
] | It is argued that high energy density excitations, responsible for UV divergences in quantum field theories, including quantum gravity, are likely to be the source of child universes which carry them out of the original space time. This decoupling prevents these high UV excitations from having any influence on physical... |
gr-qc/0701060 | Joseph Katz | D. Lynden-Bell, Joseph Katz and Jiri Bicak | Energy and angular momentum densities of stationary gravity fields | Accepted for publication in Phys. Rev. D | Phys.Rev.D75:024040,2007; Erratum-ibid.D75:044901,2007 | 10.1103/PhysRevD.75.024040 10.1103/PhysRevD.75.044901 | null | gr-qc | null | We give physical explanations of explicit invariant expressions for the
energy and angular momentum densities of gravitational fields in stationary
space-times. These expressions involve non-locally defined conformal factors.
In certain coordinates these become locally defined in terms of the metric.
These results ar... | [
{
"created": "Wed, 10 Jan 2007 14:22:17 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Lynden-Bell",
"D.",
""
],
[
"Katz",
"Joseph",
""
],
[
"Bicak",
"Jiri",
""
]
] | We give physical explanations of explicit invariant expressions for the energy and angular momentum densities of gravitational fields in stationary space-times. These expressions involve non-locally defined conformal factors. In certain coordinates these become locally defined in terms of the metric. These results are ... |
1801.01209 | Wu Bofeng | Bofeng Wu and Chao-Guang Huang | Multipole analysis for linearized $f(R)$ gravity with irreducible
Cartesian tensors | 24 pages | Published in PRD 96, 104052 2017 | 10.1140/epjc/s10052-019-6992-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The field equations of $f(R)$ gravity are rewritten in the form of obvious
wave equations with the stress-energy pseudotensor of the matter fields and the
gravitational field as its source under the de Donder condition. The method of
multipole analysis in terms of irreducible Cartesian tensors is applied to the
linea... | [
{
"created": "Thu, 4 Jan 2018 00:08:36 GMT",
"version": "v1"
}
] | 2019-07-24 | [
[
"Wu",
"Bofeng",
""
],
[
"Huang",
"Chao-Guang",
""
]
] | The field equations of $f(R)$ gravity are rewritten in the form of obvious wave equations with the stress-energy pseudotensor of the matter fields and the gravitational field as its source under the de Donder condition. The method of multipole analysis in terms of irreducible Cartesian tensors is applied to the lineari... |
1110.0064 | De-Cheng Zou | Peng Li, Rui-Hong Yue and De-Cheng Zou | Thermodynamics of Third Order Lovelock-Born-Infeld Black Holes | 11 pages, 21 figures | Commun.Theor.Phys.56:845-850,2011 | 10.1088/0253-6102/56/5/10 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We here explore black holes in the third order Lovelock gravity coupling with
nonlinear Born-Infeld electromagnetic field. Considering special second and
third order coefficients ($\hat{\alpha}_2^2=3\hat{\alpha}_3=\alpha^2$), we
analyze the thermodynamics of third order Lovelock-Born-Infeld black holes and,
in 7-dime... | [
{
"created": "Sat, 1 Oct 2011 02:26:54 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Li",
"Peng",
""
],
[
"Yue",
"Rui-Hong",
""
],
[
"Zou",
"De-Cheng",
""
]
] | We here explore black holes in the third order Lovelock gravity coupling with nonlinear Born-Infeld electromagnetic field. Considering special second and third order coefficients ($\hat{\alpha}_2^2=3\hat{\alpha}_3=\alpha^2$), we analyze the thermodynamics of third order Lovelock-Born-Infeld black holes and, in 7-dimens... |
2005.01848 | Jerred Jesse | Jerred Jesse, Matthew D. Duez, Francois Foucart, Milad Haddadi,
Alexander L. Knight, Courtney L. Cadenhead, Francois Hebert, Lawrence E.
Kidder, Harald P. Pfeiffer, Mark A. Scheel | Axisymmetric Hydrodynamics in Numerical Relativity Using a Multipatch
Method | 33 pages, 11 figures | Classical and Quantum Gravity 37 23501 (2020) | 10.1088/1361-6382/abbc8b | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a method of implementing the axisymmetric evolution of
general-relativistic hydrodynamics and magnetohydrodynamics through
modification of a multipatch grid scheme. In order to ease the computational
requirements required to evolve the post-merger phase of systems involving
binary compact massive objects ... | [
{
"created": "Mon, 4 May 2020 21:06:15 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Jul 2020 23:24:28 GMT",
"version": "v2"
},
{
"created": "Tue, 15 Dec 2020 00:02:24 GMT",
"version": "v3"
}
] | 2020-12-16 | [
[
"Jesse",
"Jerred",
""
],
[
"Duez",
"Matthew D.",
""
],
[
"Foucart",
"Francois",
""
],
[
"Haddadi",
"Milad",
""
],
[
"Knight",
"Alexander L.",
""
],
[
"Cadenhead",
"Courtney L.",
""
],
[
"Hebert",
"Francois",
... | We describe a method of implementing the axisymmetric evolution of general-relativistic hydrodynamics and magnetohydrodynamics through modification of a multipatch grid scheme. In order to ease the computational requirements required to evolve the post-merger phase of systems involving binary compact massive objects in... |
1901.06423 | Yeuk-Kwan Edna Cheung | Nan Zhang, and Yeuk-Kwan E. Cheung | Primordial Gravitational Waves Spectrum in the Coupled-Scalar-Tachyon
Bounce Universe | 38pages; 8 figures | null | 10.1140/epjc/s10052-020-7610-x | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive in detail the equations of motion for the tensorial modes of
primordial metric perturbations in the Coupled-Scalar-Tachyon Bounce Universe.
We solve for the gravitational wave equations in the pre-bounce contraction and
the post-bounce expansion epochs. To match the solutions of the tensor
perturbations, we... | [
{
"created": "Fri, 18 Jan 2019 21:49:27 GMT",
"version": "v1"
}
] | 2020-03-18 | [
[
"Zhang",
"Nan",
""
],
[
"Cheung",
"Yeuk-Kwan E.",
""
]
] | We derive in detail the equations of motion for the tensorial modes of primordial metric perturbations in the Coupled-Scalar-Tachyon Bounce Universe. We solve for the gravitational wave equations in the pre-bounce contraction and the post-bounce expansion epochs. To match the solutions of the tensor perturbations, we i... |
gr-qc/0612181 | Pedro Marronetti | Pedro Marronetti | Constraint Relaxation | 3 pages. To appear in the Proceedings of the Eleventh Marcel
Grossmann Meeting, Berlin, Germany, 23-29 Jule 2006, World Scientific,
Singapore (2007) | null | null | null | gr-qc | null | Full relativistic simulations in three dimensions are known to develop
runaway modes that grow exponentially and are accompanied by violations of the
Hamiltonian and momentum constraints. We present here a method that controls
the violation of these constraints and is tested with simulations of binary
neutron stars i... | [
{
"created": "Thu, 28 Dec 2006 15:17:04 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Marronetti",
"Pedro",
""
]
] | Full relativistic simulations in three dimensions are known to develop runaway modes that grow exponentially and are accompanied by violations of the Hamiltonian and momentum constraints. We present here a method that controls the violation of these constraints and is tested with simulations of binary neutron stars in ... |
1905.02496 | Ramil Izmailov N | A. Kulbakova, R. Kh. Karimov, R. N. Izmailov and K. K. Nandi | Upper limit on NUT charge from the observed terrestrial Sagnac effect | 10 pages | A. Kulbakova et al., Class. Quantum Grav 35, 115014 (2018) | 10.1088/1361-6382/aac07d | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The \textit{exact} Sagnac delay in the Kerr-Taub-NUT (Newman-Unti-Tamburino)
spacetime is derived in the equatorial plane for non-geodesic as well as
geodesic circular orbits. The resulting formula, being exact, can be directly
applied to motion in the vicinity of any spinning object including black holes
but here we... | [
{
"created": "Tue, 7 May 2019 12:26:37 GMT",
"version": "v1"
}
] | 2019-05-08 | [
[
"Kulbakova",
"A.",
""
],
[
"Karimov",
"R. Kh.",
""
],
[
"Izmailov",
"R. N.",
""
],
[
"Nandi",
"K. K.",
""
]
] | The \textit{exact} Sagnac delay in the Kerr-Taub-NUT (Newman-Unti-Tamburino) spacetime is derived in the equatorial plane for non-geodesic as well as geodesic circular orbits. The resulting formula, being exact, can be directly applied to motion in the vicinity of any spinning object including black holes but here we a... |
gr-qc/0301017 | Louis Crane | Louis Crane, David Yetter | A More Sensitive Lorentzian State Sum | 11 pages latex | null | null | null | gr-qc | null | We give the construction modulo normalization of a new state sum model for
lorentzian quantum general relativity, using the construction of Dirac's
expansors to include quantum operators corresponding to edge lengths as well as
the quantum bivectors of the Barrett-Crane model, and discuss the problem of
its normaliza... | [
{
"created": "Mon, 6 Jan 2003 19:12:35 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Crane",
"Louis",
""
],
[
"Yetter",
"David",
""
]
] | We give the construction modulo normalization of a new state sum model for lorentzian quantum general relativity, using the construction of Dirac's expansors to include quantum operators corresponding to edge lengths as well as the quantum bivectors of the Barrett-Crane model, and discuss the problem of its normalizati... |
1811.09524 | Markus P\"ossel | Markus P\"ossel | Teaching cosmology with special relativity: Piecewise inertial frames as
a model for cosmic expansion | 20 pages, 4 figures | European Journal of Physics 40 (2019), article id. 025602 | 10.1088/1361-6404/aaf2f7 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article presents a simple model that reproduces key concepts of modern
cosmology within the framework of special relativity, at a level that is
suitable for an undergraduate or high school setting. The model includes cosmic
expansion governed by a universal scale factor, the Hubble relation, proper
distances bet... | [
{
"created": "Fri, 23 Nov 2018 15:46:44 GMT",
"version": "v1"
}
] | 2019-01-14 | [
[
"Pössel",
"Markus",
""
]
] | This article presents a simple model that reproduces key concepts of modern cosmology within the framework of special relativity, at a level that is suitable for an undergraduate or high school setting. The model includes cosmic expansion governed by a universal scale factor, the Hubble relation, proper distances betwe... |
2306.10579 | SanthiKumar Rajamahanthi | M Krishna and SobhanBabu Kappala and R Santhikumar | Accelerating Plane Symmetric Cosmological Model with Bulk Viscous and
Cosmic Strings in Lyra's Geometry | 9 pages and 5 sections with references | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present study deals with Lyra's geometry in plane symmetric metric
discussed in the presence of bulk viscous fluid and one dimensional strings are
assumed to be loaded with particles and the particle energy density. The
variation of Hubble's parameter gives a constant value of decelerating
parameter. The exact so... | [
{
"created": "Sun, 18 Jun 2023 14:41:23 GMT",
"version": "v1"
}
] | 2023-06-21 | [
[
"Krishna",
"M",
""
],
[
"Kappala",
"SobhanBabu",
""
],
[
"Santhikumar",
"R",
""
]
] | The present study deals with Lyra's geometry in plane symmetric metric discussed in the presence of bulk viscous fluid and one dimensional strings are assumed to be loaded with particles and the particle energy density. The variation of Hubble's parameter gives a constant value of decelerating parameter. The exact solu... |
gr-qc/0603128 | Valery Kiselev | V.V.Kiselev, D.I.Yudin | Gravitational lensing due to dark matter modelled by vector field | 17 pages, LaTeX iopart class, 10 eps figures; explanaitions and
discussion are extended and improved, reference added; version to appear in
Classical and Quantum Gravity | Class.Quant.Grav. 23 (2006) 7417-7430 | 10.1088/0264-9381/23/24/013 | null | gr-qc astro-ph hep-ph | null | The specified constant 4-vector field reproducing the spherically symmetric
stationary metric of cold dark matter halo in the region of flat rotation
curves results in a constant angle of light deflection at small impact
distances. The effective deflecting mass is factor $\pi/2$ greater than the
dark matter mass. The... | [
{
"created": "Fri, 31 Mar 2006 06:01:39 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Oct 2006 07:28:12 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Kiselev",
"V. V.",
""
],
[
"Yudin",
"D. I.",
""
]
] | The specified constant 4-vector field reproducing the spherically symmetric stationary metric of cold dark matter halo in the region of flat rotation curves results in a constant angle of light deflection at small impact distances. The effective deflecting mass is factor $\pi/2$ greater than the dark matter mass. The p... |
2201.02211 | Eric Linder | Eric V. Linder | Well Tempered Cosmology: Scales | 6 pages | null | null | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Well tempered cosmology provides a well defined path for obtaining cosmology
with a low energy cosmic acceleration despite a high (Planck) energy
cosmological constant $\Lambda$, through a scalar field dynamically canceling
$\Lambda$. We explore relations between the mass scales entering the various
Horndeski gravity... | [
{
"created": "Thu, 6 Jan 2022 19:02:19 GMT",
"version": "v1"
}
] | 2022-01-10 | [
[
"Linder",
"Eric V.",
""
]
] | Well tempered cosmology provides a well defined path for obtaining cosmology with a low energy cosmic acceleration despite a high (Planck) energy cosmological constant $\Lambda$, through a scalar field dynamically canceling $\Lambda$. We explore relations between the mass scales entering the various Horndeski gravity t... |
1411.6445 | Tao Wang | Tower Wang | Cosmological horizons as new examples of membrane paradigm | 24 pages, title changed, sect V and appendix enlarged | null | 10.1088/0264-9381/32/19/195006 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we aim to provide new examples of the application and the
generality of the membrane paradigm. The membrane paradigm is a formalism for
studying the event horizon of black holes. After analyzing it with some
technical details and realizing it in the Reissner-Nordstrom black hole, we
apply the paradigm t... | [
{
"created": "Mon, 24 Nov 2014 13:26:26 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Dec 2015 17:43:38 GMT",
"version": "v2"
}
] | 2015-12-02 | [
[
"Wang",
"Tower",
""
]
] | In this paper we aim to provide new examples of the application and the generality of the membrane paradigm. The membrane paradigm is a formalism for studying the event horizon of black holes. After analyzing it with some technical details and realizing it in the Reissner-Nordstrom black hole, we apply the paradigm to ... |
0802.1599 | A. Yu. Ignatiev | A. Yu. Ignatiev | Newton's second law versus modified-inertia MOND: a test using the
high-latitude effect | 15 pages, 1 figure | Phys.Rev.D77:102001,2008 | 10.1103/PhysRevD.77.102001 | null | gr-qc astro-ph hep-ph | null | The modified-inertia MOND is an approach that proposes a change in Newton's
second law at small accelerations as an alternative to dark matter. Recently it
was suggested that this approach can be tested in terrestrial laboratory
experiments. One way of doing the test is based on the Static High-Latitude
Equinox Modif... | [
{
"created": "Tue, 12 Feb 2008 11:22:35 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ignatiev",
"A. Yu.",
""
]
] | The modified-inertia MOND is an approach that proposes a change in Newton's second law at small accelerations as an alternative to dark matter. Recently it was suggested that this approach can be tested in terrestrial laboratory experiments. One way of doing the test is based on the Static High-Latitude Equinox Modifie... |
2101.10302 | Haryanto Siahaan | Haryanto M. Siahaan | Magnetized Reissner-Nordstrom-Taub-NUT spacetime and microscopic entropy | 15 pages, no figures; v2, refs added; v3, some new materials added | null | 10.1140/epjc/s10052-021-09643-2 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We present a novel solution describing magnetized spacetime outside a massive
object with electric charge equipped with NUT parameter. To get the solution,
we employ the Ernst magnetization to the Reissner-Nordstrom-Taub-NUT spacetime
as the seed. After discussing some physical aspects of the spacetime, we show
that ... | [
{
"created": "Mon, 25 Jan 2021 18:36:12 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Feb 2021 16:44:10 GMT",
"version": "v2"
},
{
"created": "Wed, 24 Mar 2021 16:02:46 GMT",
"version": "v3"
}
] | 2021-10-04 | [
[
"Siahaan",
"Haryanto M.",
""
]
] | We present a novel solution describing magnetized spacetime outside a massive object with electric charge equipped with NUT parameter. To get the solution, we employ the Ernst magnetization to the Reissner-Nordstrom-Taub-NUT spacetime as the seed. After discussing some physical aspects of the spacetime, we show that th... |
1109.0052 | Gabriel Leon | Gabriel Le\'on and Daniel Sudarsky | Novel Possibility of Nonstandard Statistics in the Inflationary Spectrum
of Primordial Inhomogeneities | null | SIGMA 8 (2012), 024, 18 pages | 10.3842/SIGMA.2012.024 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/3.0/ | Inflation is considered one of the cornerstones of modern cosmology. However,
the account of the origin of cosmic structure, as provided by the standard
inflationary paradigm, is not fully satisfactory. The fundamental issue is the
inability of the usual account to point out the physical mechanism responsible
for gen... | [
{
"created": "Wed, 31 Aug 2011 23:33:49 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Mar 2012 15:21:37 GMT",
"version": "v2"
},
{
"created": "Sat, 21 Apr 2012 04:30:06 GMT",
"version": "v3"
}
] | 2012-04-24 | [
[
"León",
"Gabriel",
""
],
[
"Sudarsky",
"Daniel",
""
]
] | Inflation is considered one of the cornerstones of modern cosmology. However, the account of the origin of cosmic structure, as provided by the standard inflationary paradigm, is not fully satisfactory. The fundamental issue is the inability of the usual account to point out the physical mechanism responsible for gener... |
1712.08171 | Gon\c{c}alo Quinta | Gon\c{c}alo M. Quinta, Antonino Flachi, Jos\'e P. S. Lemos | Quantum vacuum polarization around a Reissner-Nordstr\"om black hole in
five dimensions | 6 pages, 3 figures | Phys. Rev. D 97, 025023 (2018) | 10.1103/PhysRevD.97.025023 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | WKB approximation methods are applied to the case of a massive scalar field
around a 5-dimensional Reissner-Nordstr\"om black hole. The divergences are
explicitly isolated and the cancellation against the Schwinger-De Witt
counter-terms proven. The resulting finite quantity is evaluated for different
values of the fr... | [
{
"created": "Thu, 21 Dec 2017 19:01:01 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Feb 2018 11:35:55 GMT",
"version": "v2"
}
] | 2018-02-07 | [
[
"Quinta",
"Gonçalo M.",
""
],
[
"Flachi",
"Antonino",
""
],
[
"Lemos",
"José P. S.",
""
]
] | WKB approximation methods are applied to the case of a massive scalar field around a 5-dimensional Reissner-Nordstr\"om black hole. The divergences are explicitly isolated and the cancellation against the Schwinger-De Witt counter-terms proven. The resulting finite quantity is evaluated for different values of the free... |
1310.7436 | Daniela Doneva | Daniela D. Doneva, Stoytcho S. Yazadjiev, Nikolaos Stergioulas, Kostas
D. Kokkotas | Breakdown of I-Love-Q universality in rapidly rotating relativistic
stars | 8 pages, 4 figures; v2-Results extended to additional EOS; v3-Match
the journal version | 2014, ApJ Letters 781, L6 | 10.1088/2041-8205/781/1/L6 | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It was shown recently, that normalized relations between the moment of
inertia (I), the quadrupole moment (Q) and the tidal deformability (Love
number) exist and for slowly-rotating neutron stars they are almost independent
of the equation of state (EOS). We extend the computation of the I-Q relation
to models rotati... | [
{
"created": "Mon, 28 Oct 2013 14:51:10 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Nov 2013 20:58:51 GMT",
"version": "v2"
},
{
"created": "Sun, 23 Feb 2014 19:46:38 GMT",
"version": "v3"
}
] | 2014-02-25 | [
[
"Doneva",
"Daniela D.",
""
],
[
"Yazadjiev",
"Stoytcho S.",
""
],
[
"Stergioulas",
"Nikolaos",
""
],
[
"Kokkotas",
"Kostas D.",
""
]
] | It was shown recently, that normalized relations between the moment of inertia (I), the quadrupole moment (Q) and the tidal deformability (Love number) exist and for slowly-rotating neutron stars they are almost independent of the equation of state (EOS). We extend the computation of the I-Q relation to models rotating... |
gr-qc/0009102 | caroline dos santos | Caroline Santos | Cosmic strings in axionic-dilatonic gravity | Latex file. 16 pages | Class.Quant.Grav.18:1835-1846,2001 | 10.1088/0264-9381/18/10/302 | DTP/00/85 | gr-qc | null | We first consider local cosmic strings in dilaton-axion gravity and show that
they are singular solutions. Then we take a supermassive Higgs limit and
present expressions for the fields at far distances from the core by applying a
Pecci-Quinn and a duality transformation to the dilatonic Melvin's magnetic
universe.
| [
{
"created": "Fri, 29 Sep 2000 09:35:25 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Oct 2000 16:09:07 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Santos",
"Caroline",
""
]
] | We first consider local cosmic strings in dilaton-axion gravity and show that they are singular solutions. Then we take a supermassive Higgs limit and present expressions for the fields at far distances from the core by applying a Pecci-Quinn and a duality transformation to the dilatonic Melvin's magnetic universe. |
2303.14724 | Vasilis Oikonomou | V.K. Oikonomou, Konstantinos-Rafail Revis, Ilias C. Papadimitriou,
Maria-Myrto Pegioudi | Swampland Criteria and Constraints on Inflation in a $f(R,T)$ Gravity
Theory | IJMPD Accepted | Int.J.Mod.Phys.D 32 (2023) 06, 2350034 | 10.1142/S0218271823500347 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we worked in the framework of an inflationary $f(R,T)$ theory,
in the presence of a canonical scalar field. More specifically, the
$f(R,T)=\gamma R+2\kappa\alpha T$ gravity. The values of the dimensionless
parameters $\alpha$ and $\gamma$ are taken to be $\alpha \geq 0$ and $0 <
\gamma \leq 1$. The mot... | [
{
"created": "Sun, 26 Mar 2023 13:42:53 GMT",
"version": "v1"
}
] | 2023-08-01 | [
[
"Oikonomou",
"V. K.",
""
],
[
"Revis",
"Konstantinos-Rafail",
""
],
[
"Papadimitriou",
"Ilias C.",
""
],
[
"Pegioudi",
"Maria-Myrto",
""
]
] | In this paper, we worked in the framework of an inflationary $f(R,T)$ theory, in the presence of a canonical scalar field. More specifically, the $f(R,T)=\gamma R+2\kappa\alpha T$ gravity. The values of the dimensionless parameters $\alpha$ and $\gamma$ are taken to be $\alpha \geq 0$ and $0 < \gamma \leq 1$. The motiv... |
gr-qc/9910060 | Christopher J. Fewster | C.J. Fewster (Dept. of Mathematics, University of York, U.K.) | A general worldline quantum inequality | 19pp, LaTeX2e. The statement of the main result is changed slightly.
Several typos fixed, references added. To appear in Class Quantum Grav | Class.Quant.Grav. 17 (2000) 1897-1911 | 10.1088/0264-9381/17/9/302 | null | gr-qc hep-th math-ph math.MP | null | Worldline quantum inequalities provide lower bounds on weighted averages of
the renormalised energy density of a quantum field along the worldline of an
observer. In the context of real, linear scalar field theory on an arbitrary
globally hyperbolic spacetime, we establish a worldline quantum inequality on
the normal... | [
{
"created": "Mon, 18 Oct 1999 14:32:49 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Feb 2000 14:43:42 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Fewster",
"C. J.",
"",
"Dept. of Mathematics, University of York, U.K."
]
] | Worldline quantum inequalities provide lower bounds on weighted averages of the renormalised energy density of a quantum field along the worldline of an observer. In the context of real, linear scalar field theory on an arbitrary globally hyperbolic spacetime, we establish a worldline quantum inequality on the normal o... |
gr-qc/0508024 | Yuri Obukhov | Friedrich W. Hehl, Yuri N. Obukhov | Spacetime metric from local and linear electrodynamics: a new axiomatic
scheme | Latex, 27 pages, 8 eps figures (better quality files are available
from the authors). Invited lecture, 339th WE Heraeus Seminar on Special
Relativity, Potsdam, Germany, 13-18 February 2005, To be published in the
Proceedings | Lect.NotesPhys.702:163-187,2006 | 10.1007/3-540-34523-X_7 | null | gr-qc hep-th physics.class-ph | null | We consider spacetime to be a 4-dimensional differentiable manifold that can
be split locally into time and space. No metric, no linear connection are
assumed. Matter is described by classical fields/fluids. We distinguish
electrically charged from neutral matter. Electric charge and magnetic flux are
postulated to b... | [
{
"created": "Sun, 7 Aug 2005 08:39:28 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Hehl",
"Friedrich W.",
""
],
[
"Obukhov",
"Yuri N.",
""
]
] | We consider spacetime to be a 4-dimensional differentiable manifold that can be split locally into time and space. No metric, no linear connection are assumed. Matter is described by classical fields/fluids. We distinguish electrically charged from neutral matter. Electric charge and magnetic flux are postulated to be ... |
gr-qc/0008060 | Viqar Husain | Viqar Husain and Michel Olivier | Scalar field collapse in three-dimensional AdS spacetime | 10 pages, 1 figure; references added, to appear in CQG(L) | Class.Quant.Grav.18:L1-L10,2001 | 10.1088/0264-9381/18/2/101 | UNB Report 2000-02 | gr-qc hep-th physics.comp-ph | null | We describe results of a numerical calculation of circularly symmetric scalar
field collapse in three spacetime dimensions with negative cosmological
constant. The procedure uses a double null formulation of the Einstein-scalar
equations. We see evidence of black hole formation on first implosion of a
scalar pulse if... | [
{
"created": "Thu, 24 Aug 2000 17:02:10 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Dec 2000 21:46:27 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Husain",
"Viqar",
""
],
[
"Olivier",
"Michel",
""
]
] | We describe results of a numerical calculation of circularly symmetric scalar field collapse in three spacetime dimensions with negative cosmological constant. The procedure uses a double null formulation of the Einstein-scalar equations. We see evidence of black hole formation on first implosion of a scalar pulse if t... |
1701.00486 | Piotr T. Chru\'sciel | R. Beig, P.T. Chru\'sciel | Shielding linearised gravity | new sections on the Weyl tensor formulation added | Phys. Rev. D 95, 064063 (2017) | 10.1103/PhysRevD.95.064063 | Preprint UWThPh-2016-31 | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an elementary argument that one can shield linearised
gravitational fields using linearised gravitational fields. This is done by
using third-order potentials for the metric, which avoids the need to solve
singular equations in shielding or gluing constructions for the linearised
metric.
| [
{
"created": "Mon, 2 Jan 2017 09:41:33 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Mar 2017 14:56:10 GMT",
"version": "v2"
}
] | 2017-04-05 | [
[
"Beig",
"R.",
""
],
[
"Chruściel",
"P. T.",
""
]
] | We present an elementary argument that one can shield linearised gravitational fields using linearised gravitational fields. This is done by using third-order potentials for the metric, which avoids the need to solve singular equations in shielding or gluing constructions for the linearised metric. |
gr-qc/9801071 | Arlen Anderson | Arlen Anderson, Andrew M. Abrahams, and Chris Lea | Curvature-based Gauge-Invariant Perturbation Theory for Gravity: A New
Paradigm | 32 pp., LaTeX | Phys.Rev.D58:064015,1998 | 10.1103/PhysRevD.58.064015 | IFP-UNC-522 | gr-qc | null | A new approach to gravitational gauge-invariant perturbation theory begins
from the fourth-order Einstein-Ricci system, a hyperbolic formulation of
gravity for arbitrary lapse and shift whose centerpiece is a wave equation for
curvature. In the Minkowski and Schwarzschild backgrounds, an intertwining
operator procedu... | [
{
"created": "Tue, 20 Jan 1998 21:58:33 GMT",
"version": "v1"
}
] | 2011-04-21 | [
[
"Anderson",
"Arlen",
""
],
[
"Abrahams",
"Andrew M.",
""
],
[
"Lea",
"Chris",
""
]
] | A new approach to gravitational gauge-invariant perturbation theory begins from the fourth-order Einstein-Ricci system, a hyperbolic formulation of gravity for arbitrary lapse and shift whose centerpiece is a wave equation for curvature. In the Minkowski and Schwarzschild backgrounds, an intertwining operator procedure... |
2112.10773 | Oleg Bulashenko | Oleg Bulashenko and Helena Ubach | Lensing of gravitational waves: universal signatures in the beating
pattern | 31 pages, 13 figs. Some modifications, version accepted by JCAP | JCAP 07 (2022) 022 | 10.1088/1475-7516/2022/07/022 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | When gravitational waves propagate near massive objects, their paths curve
resulting in gravitational lensing, which is expected to be a promising new
instrument in astrophysics. If the time delay between different paths is
comparable with the wave period, lensing may induce beating patterns in the
waveform, and it i... | [
{
"created": "Mon, 20 Dec 2021 12:09:45 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Jul 2022 18:18:56 GMT",
"version": "v2"
}
] | 2022-07-14 | [
[
"Bulashenko",
"Oleg",
""
],
[
"Ubach",
"Helena",
""
]
] | When gravitational waves propagate near massive objects, their paths curve resulting in gravitational lensing, which is expected to be a promising new instrument in astrophysics. If the time delay between different paths is comparable with the wave period, lensing may induce beating patterns in the waveform, and it is ... |
1404.7631 | Alessandro Pesci | Alessandro Pesci | Entropy bounds and field equations | 8 pages, 1 figure; v4: some typos corrected, one reference and some
clarifications added, some editing | Entropy 17 (2015) 5799 | 10.3390/e17085799 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For general metric theories of gravity, we compare the approach that
describes-derives the field equations of gravity as a thermodynamic identity
with the one which looks at them from entropy bounds. The comparison is made
through the consideration of the matter entropy flux across (Rindler) horizons,
studied by maki... | [
{
"created": "Wed, 30 Apr 2014 08:35:57 GMT",
"version": "v1"
},
{
"created": "Wed, 28 May 2014 13:43:39 GMT",
"version": "v2"
},
{
"created": "Fri, 27 Mar 2015 07:50:46 GMT",
"version": "v3"
},
{
"created": "Thu, 13 Aug 2015 14:55:03 GMT",
"version": "v4"
}
] | 2015-10-28 | [
[
"Pesci",
"Alessandro",
""
]
] | For general metric theories of gravity, we compare the approach that describes-derives the field equations of gravity as a thermodynamic identity with the one which looks at them from entropy bounds. The comparison is made through the consideration of the matter entropy flux across (Rindler) horizons, studied by making... |
gr-qc/0701021 | Marc Lachieze-Rey | Marc Lachieze-Rey (APC) | Cosmology in the Solar System: Pioneer effect is not cosmological | null | Class.Quant.Grav.24:2735-2742,2007 | 10.1088/0264-9381/24/10/016 | null | gr-qc astro-ph | null | Does the Solar System and, more generally, a gravitationally bound system
follow the cosmic expansion law ? Is there a cosmological influence on the
dynamics or optics in such systems ? The general relativity theory provides an
unique and unambiguous answer, as a solution of Einstein equations with a local
source in ... | [
{
"created": "Tue, 2 Jan 2007 16:00:09 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Feb 2007 14:12:29 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Lachieze-Rey",
"Marc",
"",
"APC"
]
] | Does the Solar System and, more generally, a gravitationally bound system follow the cosmic expansion law ? Is there a cosmological influence on the dynamics or optics in such systems ? The general relativity theory provides an unique and unambiguous answer, as a solution of Einstein equations with a local source in ad... |
gr-qc/0407032 | Yuan-Zhong Zhang | Kamal Kanti Nandi, Yuan-Zhong Zhang and K.B.Vijaya Kumar | Semiclassical and Quantum Field Theoretic Bounds for Traversable
Lorentzian Stringy Wormholes | 15 pages | Phys.Rev. D70 (2004) 064018 | 10.1103/PhysRevD.70.064018 | null | gr-qc | null | A lower bound on the size of a Lorentzian wormhole can be obtained by
semiclassically introducing the Planck cut-off on the magnitude of tidal forces
(Horowitz-Ross constraint). Also, an upper bound is provided by the quantum
field theoretic constraint in the form of the Ford-Roman Quantum Inequality for
massless min... | [
{
"created": "Thu, 8 Jul 2004 02:58:18 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Nandi",
"Kamal Kanti",
""
],
[
"Zhang",
"Yuan-Zhong",
""
],
[
"Kumar",
"K. B. Vijaya",
""
]
] | A lower bound on the size of a Lorentzian wormhole can be obtained by semiclassically introducing the Planck cut-off on the magnitude of tidal forces (Horowitz-Ross constraint). Also, an upper bound is provided by the quantum field theoretic constraint in the form of the Ford-Roman Quantum Inequality for massless minim... |
0806.0443 | Alex Kirillov | A.A. Kirillov, E.P. Savelova | Spacetime foam | minor corrections | null | null | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spacetime foam is analyzed within the simplistic model of a set of scalar
fields on a flat background. We suggest the formula for the path integral which
allows to account for the all possible topologies of spacetime. We show that
the proper path integral defines a cutoff for the field theory. The form of the
cutoff ... | [
{
"created": "Tue, 3 Jun 2008 06:18:46 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jun 2008 13:42:31 GMT",
"version": "v2"
}
] | 2008-09-11 | [
[
"Kirillov",
"A. A.",
""
],
[
"Savelova",
"E. P.",
""
]
] | Spacetime foam is analyzed within the simplistic model of a set of scalar fields on a flat background. We suggest the formula for the path integral which allows to account for the all possible topologies of spacetime. We show that the proper path integral defines a cutoff for the field theory. The form of the cutoff is... |
0810.5419 | Shahar Hod | Shahar Hod | Quasinormal resonances of near-extremal Kerr-Newman black holes | 4 pages | Phys.Lett.B666:483-485,2008 | 10.1016/j.physletb.2008.08.002 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study analytically the fundamental resonances of near-extremal, slowly
rotating Kerr-Newman black holes. We find a simple analytic expression for
these black-hole quasinormal frequencies in terms of the black-hole physical
parameters: omega=m Omega-2i pi T(l+1+n), where T and Omega are the temperature
and angular ... | [
{
"created": "Thu, 30 Oct 2008 05:45:20 GMT",
"version": "v1"
}
] | 2009-01-16 | [
[
"Hod",
"Shahar",
""
]
] | We study analytically the fundamental resonances of near-extremal, slowly rotating Kerr-Newman black holes. We find a simple analytic expression for these black-hole quasinormal frequencies in terms of the black-hole physical parameters: omega=m Omega-2i pi T(l+1+n), where T and Omega are the temperature and angular ve... |
1606.08049 | Parthapratim Pradhan | Parthapratim Pradhan | Horizon Areas and Logarithmic Correction to the Charged Accelerating
Black Hole Entropy | Accepted in Universe,2019, Invited article | Universe 2019, 5(2), 57 | 10.3390/universe5020057 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been shown by explicit and exact calculation that the geometric
product formula i.e. horizon area (or entropy) product formula of outer horizon
(${\cal H}^{+}$) and inner horizon (${\cal H}^{-}$) for charged accelerating
black hole (BH) should \emph{ neither be mass-independent nor it be quantized}.
This impli... | [
{
"created": "Sun, 26 Jun 2016 16:25:13 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Nov 2017 15:40:29 GMT",
"version": "v2"
},
{
"created": "Mon, 11 Feb 2019 17:08:42 GMT",
"version": "v3"
}
] | 2019-02-12 | [
[
"Pradhan",
"Parthapratim",
""
]
] | It has been shown by explicit and exact calculation that the geometric product formula i.e. horizon area (or entropy) product formula of outer horizon (${\cal H}^{+}$) and inner horizon (${\cal H}^{-}$) for charged accelerating black hole (BH) should \emph{ neither be mass-independent nor it be quantized}. This implies... |
1502.01225 | Sean Gryb B | Sean Gryb and Karim Thebault | Schrodinger Evolution for the Universe: Reparametrization | 25 pages (including title page and references), 1 figure | Class.Quant.Grav. 33 (2016) no.6, 065004 | 10.1088/0264-9381/33/6/065004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Starting from a generalized Hamilton-Jacobi formalism, we develop a new
framework for constructing observables and their evolution in theories
invariant under global time reparametrizations. Our proposal relaxes the usual
Dirac prescription for the observables of a totally constrained system
(`perennials') and allows... | [
{
"created": "Wed, 4 Feb 2015 15:08:55 GMT",
"version": "v1"
}
] | 2017-11-15 | [
[
"Gryb",
"Sean",
""
],
[
"Thebault",
"Karim",
""
]
] | Starting from a generalized Hamilton-Jacobi formalism, we develop a new framework for constructing observables and their evolution in theories invariant under global time reparametrizations. Our proposal relaxes the usual Dirac prescription for the observables of a totally constrained system (`perennials') and allows o... |
2105.01546 | Gauranga Samanta | Nisha Godani and Gauranga C Samanta | FRW Cosmology in $f(Q,T)$ Gravity | 15 pages, 8 figures, accepted for publication in Int. J. Geom.
Method. Mod. Phys | null | 10.1142/S0219887821501346 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we considered the study of Friedmann-Robertson-Walker (FRW)
model in the framework of $f(Q,T)$ gravity, an extension of symmetric
teleparallel gravity, recently defined by Y. Xu et al. \cite{Xu}. The
non-linear model $f(Q,T)=-\alpha Q-\beta T^2$, where $\alpha>0$ and $\beta>0$
are constants, is taken i... | [
{
"created": "Sat, 1 May 2021 11:17:56 GMT",
"version": "v1"
}
] | 2021-05-05 | [
[
"Godani",
"Nisha",
""
],
[
"Samanta",
"Gauranga C",
""
]
] | In this paper, we considered the study of Friedmann-Robertson-Walker (FRW) model in the framework of $f(Q,T)$ gravity, an extension of symmetric teleparallel gravity, recently defined by Y. Xu et al. \cite{Xu}. The non-linear model $f(Q,T)=-\alpha Q-\beta T^2$, where $\alpha>0$ and $\beta>0$ are constants, is taken int... |
1111.7254 | Roberto B. Salgado | Roberto B. Salgado | Relativity on Rotated Graph Paper | 30 pages, 17 figures. For an earlier approach, see
arXiv:physics/0505134v1 | Am. J. Phys. 84, 344 (2016) | 10.1119/1.4943251 | null | gr-qc physics.class-ph physics.ed-ph physics.pop-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present visual calculations in special relativity using spacetime diagrams
drawn on graph paper that has been rotated by 45 degrees. The rotated lines
represent lightlike directions in Minkowski spacetime, and the boxes in the
grid (called "light-clock diamonds") represent units of measurement modeled on
the ticks... | [
{
"created": "Wed, 30 Nov 2011 18:01:46 GMT",
"version": "v1"
}
] | 2016-04-21 | [
[
"Salgado",
"Roberto B.",
""
]
] | We present visual calculations in special relativity using spacetime diagrams drawn on graph paper that has been rotated by 45 degrees. The rotated lines represent lightlike directions in Minkowski spacetime, and the boxes in the grid (called "light-clock diamonds") represent units of measurement modeled on the ticks o... |
gr-qc/9412031 | Ulvi Yurtsever | Ulvi Yurtsever | Geometry of chaos in the two-center problem in General Relativity | 14 pages, 7 figures | Phys.Rev.D52:3176-3183,1995 | 10.1103/PhysRevD.52.3176 | null | gr-qc | null | The now-famous Majumdar-Papapetrou exact solution of the Einstein-Maxwell
equations describes, in general, $N$ static, maximally charged black holes
balanced under mutual gravitational and electrostatic interaction. When $N=2$,
this solution defines the two-black-hole spacetime, and the relativistic
two-center proble... | [
{
"created": "Sat, 10 Dec 1994 00:54:34 GMT",
"version": "v1"
}
] | 2010-01-15 | [
[
"Yurtsever",
"Ulvi",
""
]
] | The now-famous Majumdar-Papapetrou exact solution of the Einstein-Maxwell equations describes, in general, $N$ static, maximally charged black holes balanced under mutual gravitational and electrostatic interaction. When $N=2$, this solution defines the two-black-hole spacetime, and the relativistic two-center problem ... |
2205.05132 | Hector O. Silva | Hector O. Silva, Abhirup Ghosh, Alessandra Buonanno | Black-hole ringdown as a probe of higher-curvature gravity theories | 21 pages, 12 figures. v2. Matches published version | Phys. Rev. D 107, 044030 (2023) | 10.1103/PhysRevD.107.044030 | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | Detecting gravitational waves from coalescing compact binaries allows us to
explore the dynamical, nonlinear regime of general relativity and constrain
modifications to it. Some of the gravitational-wave events observed by the
LIGO-Virgo Collaboration have sufficiently high signal-to-noise ratio in the
merger, allowi... | [
{
"created": "Tue, 10 May 2022 19:33:39 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Feb 2023 14:47:48 GMT",
"version": "v2"
}
] | 2023-02-23 | [
[
"Silva",
"Hector O.",
""
],
[
"Ghosh",
"Abhirup",
""
],
[
"Buonanno",
"Alessandra",
""
]
] | Detecting gravitational waves from coalescing compact binaries allows us to explore the dynamical, nonlinear regime of general relativity and constrain modifications to it. Some of the gravitational-wave events observed by the LIGO-Virgo Collaboration have sufficiently high signal-to-noise ratio in the merger, allowing... |
1912.11490 | Parampreet Singh | John L. Dupuy, Parampreet Singh | Hysteresis and beats in loop quantum cosmology | 12 pages, 17 figures | Phys. Rev. D 101, 086016 (2020) | 10.1103/PhysRevD.101.086016 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Differences in pressure during expansion and contraction stages in cosmic
evolution can result in a hysteresis-like phenomena in non-singular cyclic
models sourced with scalar fields. We discuss this phenomena for spatially
closed isotropic spacetime in loop quantum cosmology (LQC) for a quadratic and
a cosh-like pot... | [
{
"created": "Tue, 24 Dec 2019 19:02:08 GMT",
"version": "v1"
}
] | 2020-04-22 | [
[
"Dupuy",
"John L.",
""
],
[
"Singh",
"Parampreet",
""
]
] | Differences in pressure during expansion and contraction stages in cosmic evolution can result in a hysteresis-like phenomena in non-singular cyclic models sourced with scalar fields. We discuss this phenomena for spatially closed isotropic spacetime in loop quantum cosmology (LQC) for a quadratic and a cosh-like poten... |
0807.0300 | Alessandro Pesci | Alessandro Pesci | A note on the connection between the universal relaxation bound and the
covariant entropy bound | One reference added; some editing | Int.J.Mod.Phys.D18:831-835,2009 | 10.1142/S0218271809014789 | null | gr-qc cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recently proposed universal lower-bound to the characteristic relaxation
times of perturbed thermodynamic systems, derived from quantum information
theory and (classical) thermodynamics and known to be saturated for (certain)
black holes, is investigated in the light of the gravity/thermodynamics
connection. A stat... | [
{
"created": "Wed, 2 Jul 2008 08:58:27 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Jun 2009 14:51:17 GMT",
"version": "v2"
}
] | 2009-07-22 | [
[
"Pesci",
"Alessandro",
""
]
] | A recently proposed universal lower-bound to the characteristic relaxation times of perturbed thermodynamic systems, derived from quantum information theory and (classical) thermodynamics and known to be saturated for (certain) black holes, is investigated in the light of the gravity/thermodynamics connection. A statis... |
2101.00856 | Steffen Aksteiner | Steffen Aksteiner, Lars Andersson, Bernardo Araneda, Bernard Whiting | On the geometry of Petrov type II spacetimes | null | null | 10.1088/1361-6382/abf542 | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | In general, geometries of Petrov type II do not admit symmetries in terms of
Killing vectors or spinors. We introduce a weaker form of Killing equations
which do admit solutions. In particular, there is an analog of the
Penrose-Walker Killing spinor. Some of its properties, including associated
conservation laws, are... | [
{
"created": "Mon, 4 Jan 2021 10:02:19 GMT",
"version": "v1"
}
] | 2021-07-07 | [
[
"Aksteiner",
"Steffen",
""
],
[
"Andersson",
"Lars",
""
],
[
"Araneda",
"Bernardo",
""
],
[
"Whiting",
"Bernard",
""
]
] | In general, geometries of Petrov type II do not admit symmetries in terms of Killing vectors or spinors. We introduce a weaker form of Killing equations which do admit solutions. In particular, there is an analog of the Penrose-Walker Killing spinor. Some of its properties, including associated conservation laws, are d... |
2112.08290 | Matteo Luca Ruggiero | Matteo Luca Ruggiero, Antonello Ortolan, Clive C. Speake | Galactic Dynamics in General Relativity: the Role of Gravitomagnetism | 10 pages, revised to match the version accepted for publication in
Classical and Quantum Gravity | Class. Quantum Grav. 39 (2022) 225015 | 10.1088/1361-6382/ac9949 | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is a well known fact that, in the absence of Dark Matter, the observation
of the rotation curves of galaxies cannot be explained in terms of Newtonian
gravity. Rotation curves become flat in the outer regions, in contrast to what
is expected according to Keplerian motion. Far from the galactic center, the
gravitat... | [
{
"created": "Wed, 15 Dec 2021 17:36:17 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Oct 2022 15:04:47 GMT",
"version": "v2"
}
] | 2022-11-01 | [
[
"Ruggiero",
"Matteo Luca",
""
],
[
"Ortolan",
"Antonello",
""
],
[
"Speake",
"Clive C.",
""
]
] | It is a well known fact that, in the absence of Dark Matter, the observation of the rotation curves of galaxies cannot be explained in terms of Newtonian gravity. Rotation curves become flat in the outer regions, in contrast to what is expected according to Keplerian motion. Far from the galactic center, the gravitatio... |
1107.5250 | Eva Hackmann | Eva Hackmann and Claus L\"ammerzahl | Observables for bound orbital motion in axially symmetric space-times | 18 pages, revised version | Phys. Rev. D 85, 044049 (2012) | 10.1103/PhysRevD.85.044049 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The periastron shift and the Lense-Thirring effect of bound orbital motion in
a general axially symmetric space-time given by Pleba\'nski and Demia\'nski are
analyzed. We also define a measure for the conicity of the orbit and give
analytic expressions for all three observables in terms of hyperelliptic
integrals and... | [
{
"created": "Tue, 26 Jul 2011 16:02:25 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Sep 2011 10:33:38 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Apr 2012 10:33:58 GMT",
"version": "v3"
}
] | 2012-04-12 | [
[
"Hackmann",
"Eva",
""
],
[
"Lämmerzahl",
"Claus",
""
]
] | The periastron shift and the Lense-Thirring effect of bound orbital motion in a general axially symmetric space-time given by Pleba\'nski and Demia\'nski are analyzed. We also define a measure for the conicity of the orbit and give analytic expressions for all three observables in terms of hyperelliptic integrals and L... |
2204.11617 | Luca Guido Molinari | Carlo Alberto Mantica and Luca Guido Molinari | Spherical doubly warped spacetimes for radiating stars and cosmology | 27 pages, submitted to GERG | General Relativity and Gravitation (2022) 54:98 (open access) | 10.1007/s10714-022-02984-7 | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spherically symmetric spacetimes are ambient spaces for models of stellar
collapse and inhomogeneous cosmology. We obtain results for the Weyl tensor and
the covariant form of the Ricci tensor on general doubly warped (DW)
spacetimes. In a spherically symmetric metric, the Ricci and electric tensors
become rank-2, bu... | [
{
"created": "Fri, 22 Apr 2022 14:51:58 GMT",
"version": "v1"
}
] | 2022-09-08 | [
[
"Mantica",
"Carlo Alberto",
""
],
[
"Molinari",
"Luca Guido",
""
]
] | Spherically symmetric spacetimes are ambient spaces for models of stellar collapse and inhomogeneous cosmology. We obtain results for the Weyl tensor and the covariant form of the Ricci tensor on general doubly warped (DW) spacetimes. In a spherically symmetric metric, the Ricci and electric tensors become rank-2, buil... |
1108.6067 | Erico Goulart | E. Goulart, M. Novello, F. T. Falciano, J. D. Toniato | Hidden geometries in nonlinear theories: a novel aspect of analogue
gravity | null | E Goulart et al 2011 Class. Quantum Grav. 28 245008 | 10.1088/0264-9381/28/24/245008 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that non-linear dynamics of a scalar field {\phi} may be described as
a mod- ification of the spacetime geometry. Thus, the self-interaction is
interpreted as a coupling of the scalar field with an effective gravitational
metric that is constructed with {\phi} itself. We prove that this process is
universal, ... | [
{
"created": "Tue, 30 Aug 2011 20:12:32 GMT",
"version": "v1"
}
] | 2013-06-07 | [
[
"Goulart",
"E.",
""
],
[
"Novello",
"M.",
""
],
[
"Falciano",
"F. T.",
""
],
[
"Toniato",
"J. D.",
""
]
] | We show that non-linear dynamics of a scalar field {\phi} may be described as a mod- ification of the spacetime geometry. Thus, the self-interaction is interpreted as a coupling of the scalar field with an effective gravitational metric that is constructed with {\phi} itself. We prove that this process is universal, th... |
1004.1017 | Mohammad Malekjani | M. Malekjani and A. Khodam-Mohammadi | Interacting entropy-corrected agegraphic Chaplygin gas model of dark
energy | 15 pages, no figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we consider the interacting agegraphic dark energy models with
entropy correction terms due to loop quantum gravity. We study the
correspondence between the Chaplygin gas energy density with the interacting
entropy-corrected agegraphic dark energy models in non-flat FRW universe. We
reconstruct the pote... | [
{
"created": "Wed, 7 Apr 2010 07:15:43 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Apr 2010 13:26:37 GMT",
"version": "v2"
}
] | 2010-04-20 | [
[
"Malekjani",
"M.",
""
],
[
"Khodam-Mohammadi",
"A.",
""
]
] | In this work, we consider the interacting agegraphic dark energy models with entropy correction terms due to loop quantum gravity. We study the correspondence between the Chaplygin gas energy density with the interacting entropy-corrected agegraphic dark energy models in non-flat FRW universe. We reconstruct the potent... |
1710.05832 | The LIGO Scientific Collaboration and The Virgo Collaboration | The LIGO Scientific Collaboration and The Virgo Collaboration | GW170817: Observation of Gravitational Waves from a Binary Neutron Star
Inspiral | null | Phys. Rev. Lett. 119 161101 (2017) | 10.1103/PhysRevLett.119.161101 | LIGO-P170817 | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | On August 17, 2017 at 12:41:04 UTC the Advanced LIGO and Advanced Virgo
gravitational-wave detectors made their first observation of a binary neutron
star inspiral. The signal, GW170817, was detected with a combined
signal-to-noise ratio of 32.4 and a false-alarm-rate estimate of less than one
per $8.0\times10^4$ yea... | [
{
"created": "Mon, 16 Oct 2017 16:57:17 GMT",
"version": "v1"
}
] | 2017-10-17 | [
[
"The LIGO Scientific Collaboration",
"",
""
],
[
"The Virgo Collaboration",
"",
""
]
] | On August 17, 2017 at 12:41:04 UTC the Advanced LIGO and Advanced Virgo gravitational-wave detectors made their first observation of a binary neutron star inspiral. The signal, GW170817, was detected with a combined signal-to-noise ratio of 32.4 and a false-alarm-rate estimate of less than one per $8.0\times10^4$ years... |
2006.16153 | Patricia Schmidt | Geraint Pratten, Patricia Schmidt, Riccardo Buscicchio, Lucy M. Thomas | Measuring precession in asymmetric compact binaries | 18 pages incl. appendices and bibliography, 12 figures, 4 tables;
accepted for publication in Phys. Rev. Research | Phys. Rev. Research 2, 043096 (2020) | 10.1103/PhysRevResearch.2.043096 | LIGO-DCC P2000224 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational-wave observations of merging compact binaries hold the key to
precision measurements of the objects' masses and spins. General-relativistic
precession, caused by spins misaligned with the orbital angular momentum, is
considered a crucial tracer for determining the binary's formation history and
environm... | [
{
"created": "Mon, 29 Jun 2020 16:14:54 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Sep 2020 15:15:51 GMT",
"version": "v2"
}
] | 2020-10-28 | [
[
"Pratten",
"Geraint",
""
],
[
"Schmidt",
"Patricia",
""
],
[
"Buscicchio",
"Riccardo",
""
],
[
"Thomas",
"Lucy M.",
""
]
] | Gravitational-wave observations of merging compact binaries hold the key to precision measurements of the objects' masses and spins. General-relativistic precession, caused by spins misaligned with the orbital angular momentum, is considered a crucial tracer for determining the binary's formation history and environmen... |
gr-qc/9304012 | Karel Kuchar | Karel Kuchar | Canonical Quantum Gravity | Latex, 35 pages. arXiv admin note: figures missing | null | null | UU-REL-92/12/10 | gr-qc | null | This is a review of the aspirations and disappointments of the canonical
quantization of geometry. I compare the two chief ways of looking at canonical
gravity, geometrodynamics and connection dynamics. I capture as much of the
classical theory as I can by pictorial visualization. Algebraic aspects
dominate my descri... | [
{
"created": "Thu, 8 Apr 1993 22:00:56 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kuchar",
"Karel",
""
]
] | This is a review of the aspirations and disappointments of the canonical quantization of geometry. I compare the two chief ways of looking at canonical gravity, geometrodynamics and connection dynamics. I capture as much of the classical theory as I can by pictorial visualization. Algebraic aspects dominate my descript... |
1406.3931 | Hemwati Nandan | Rashmi Uniyal, N. Chandrachani Devi, Hemwati Nandan and K.D. Purohit | Geodesic Motion in Schwarzschild Spacetime Surrounded by Quintessence | 20 pages, 8 figures | null | 10.1007/s10714-015-1857-9 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the time-like geodesic congruences, in the space-time geometry of a
Schwarzschild black hole surrounded by quintessence. The nature of effective
potential along with the structure of the possible orbits for test particles in
view of the different values of quintessence parameter are analysed in detail.
%wher... | [
{
"created": "Mon, 16 Jun 2014 08:32:15 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Jan 2015 10:49:00 GMT",
"version": "v2"
}
] | 2015-06-22 | [
[
"Uniyal",
"Rashmi",
""
],
[
"Devi",
"N. Chandrachani",
""
],
[
"Nandan",
"Hemwati",
""
],
[
"Purohit",
"K. D.",
""
]
] | We study the time-like geodesic congruences, in the space-time geometry of a Schwarzschild black hole surrounded by quintessence. The nature of effective potential along with the structure of the possible orbits for test particles in view of the different values of quintessence parameter are analysed in detail. %wherev... |
1504.05529 | Miguel Pino | Ashok Das, Jorge Gamboa, Miguel Pino | Cosmological Kinetic Mixing | 13pp, 18 figures | Phys. Rev. D 91, 123528 (2015) | 10.1103/PhysRevD.91.123528 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we generalize the kinetic mixing idea to time reparametrization
invariant theories, namely, relativistic point particles and cosmology in order
to obtain new insights for dark matter and energy. In the first example, two
relativistic particles interact through an appropriately chosen coupling term.
It i... | [
{
"created": "Wed, 15 Apr 2015 15:10:31 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Jun 2015 14:49:28 GMT",
"version": "v2"
}
] | 2015-06-30 | [
[
"Das",
"Ashok",
""
],
[
"Gamboa",
"Jorge",
""
],
[
"Pino",
"Miguel",
""
]
] | In this paper we generalize the kinetic mixing idea to time reparametrization invariant theories, namely, relativistic point particles and cosmology in order to obtain new insights for dark matter and energy. In the first example, two relativistic particles interact through an appropriately chosen coupling term. It is ... |
2311.15671 | Vitalii Vertogradov | Vitalii Vertogradov | The generalized Vaidya spacetime with polytropic equation of state | 10 pages, no figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The process of the gravitational collapse might lead not only to a black hole
but also to naked singularity formation. In this paper, we consider the
generalized Vaidya spacetime with polytropic and generalized polytropic
equations of state. We solve the Einstein and Einstein-Maxwell equations to
obtain the explicit ... | [
{
"created": "Mon, 27 Nov 2023 10:01:00 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Feb 2024 15:20:06 GMT",
"version": "v2"
}
] | 2024-02-27 | [
[
"Vertogradov",
"Vitalii",
""
]
] | The process of the gravitational collapse might lead not only to a black hole but also to naked singularity formation. In this paper, we consider the generalized Vaidya spacetime with polytropic and generalized polytropic equations of state. We solve the Einstein and Einstein-Maxwell equations to obtain the explicit fo... |
1410.6709 | Prabir Rudra | Prabir Rudra (Indian Instt. of Engg. Sci. & Tech., Pailan Colg. of
Mgmt. & Tech.) | Loop Quantum effects on Om-diagnostic and its Cosmological Implications | 9 pages, 5 figures, Accepted for publication in Canadian Journal of
Physics | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the Loop quantum effects on the \textit{Om} diagnostic
and subsequently on the universe. We reconstruct the \textit{Om} diagnostic in
the background of Loop quantum gravity and then study the behaviour of various
Chaplygin gas dark energy models using the modified diagnostic in a comparative
sc... | [
{
"created": "Sun, 19 Oct 2014 17:07:58 GMT",
"version": "v1"
}
] | 2014-10-27 | [
[
"Rudra",
"Prabir",
"",
"Indian Instt. of Engg. Sci. & Tech., Pailan Colg. of\n Mgmt. & Tech."
]
] | In this paper we study the Loop quantum effects on the \textit{Om} diagnostic and subsequently on the universe. We reconstruct the \textit{Om} diagnostic in the background of Loop quantum gravity and then study the behaviour of various Chaplygin gas dark energy models using the modified diagnostic in a comparative scen... |
gr-qc/0504113 | Allan Joseph Michael Medved | A.J.M. Medved and Elias C. Vagenas | On Hawking Radiation as Tunneling with Back-Reaction | 5 pages, latex | Mod.Phys.Lett.A20:2449-2454,2005 | 10.1142/S021773230501861X | null | gr-qc hep-th | null | Recently, Angheben et.al. [hep-th/0503081] have presented a refined method
for calculating the (tree-level) black hole temperature by way of the tunneling
paradigm. In the current letter, we demonstrate how their formalism can be
suitably adapted to accommodate the (higher-order) effects of the gravitational
back-rea... | [
{
"created": "Fri, 22 Apr 2005 19:22:27 GMT",
"version": "v1"
}
] | 2011-07-18 | [
[
"Medved",
"A. J. M.",
""
],
[
"Vagenas",
"Elias C.",
""
]
] | Recently, Angheben et.al. [hep-th/0503081] have presented a refined method for calculating the (tree-level) black hole temperature by way of the tunneling paradigm. In the current letter, we demonstrate how their formalism can be suitably adapted to accommodate the (higher-order) effects of the gravitational back-react... |
2406.05650 | Mohsen Fathi | Mohsen Fathi, J.R. Villanueva, Gilberto Aguilar-P\'erez, and Miguel
Cruz | Black hole in a generalized Chaplygin-Jacobi dark fluid: shadow and
light deflection angle | 24 pages, 10 figures, 2 tables | null | 10.1016/j.dark.2024.101598 | null | gr-qc astro-ph.CO astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We investigate a generalized Chaplygin-like gas with an anisotropic equation
of state, characterizing a dark fluid within which a static spherically
symmetric black hole is assumed. By solving the Einstein equations for this
black hole spacetime, we explicitly derive the metric function. The spacetime
is parametrized... | [
{
"created": "Sun, 9 Jun 2024 05:21:43 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Jul 2024 15:26:30 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Aug 2024 21:23:48 GMT",
"version": "v3"
}
] | 2024-08-05 | [
[
"Fathi",
"Mohsen",
""
],
[
"Villanueva",
"J. R.",
""
],
[
"Aguilar-Pérez",
"Gilberto",
""
],
[
"Cruz",
"Miguel",
""
]
] | We investigate a generalized Chaplygin-like gas with an anisotropic equation of state, characterizing a dark fluid within which a static spherically symmetric black hole is assumed. By solving the Einstein equations for this black hole spacetime, we explicitly derive the metric function. The spacetime is parametrized b... |
2304.01995 | Dawood Kothawala Dr. | Dawood Kothawala | Synge's World function and the quantum spacetime | Based on the talk "Relics of the quantum spacetime: from Synge's
world function as the fundamental probe of spacetime architecture to the
emergent description of gravity", presented at DICE2022, Castiglioncello,
Italy, Sep 19-23, 2022 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | All our observations that characterise space and time are expressed in terms
of non-local, bi-tensorial objects such as geodesic intervals between events
and two-point (Green) functions. In this contribution, I highlight the
importance of characterising spacetime geometry in terms of such non-local
objects, focusing ... | [
{
"created": "Tue, 4 Apr 2023 17:53:45 GMT",
"version": "v1"
}
] | 2023-04-05 | [
[
"Kothawala",
"Dawood",
""
]
] | All our observations that characterise space and time are expressed in terms of non-local, bi-tensorial objects such as geodesic intervals between events and two-point (Green) functions. In this contribution, I highlight the importance of characterising spacetime geometry in terms of such non-local objects, focusing pa... |
1008.5280 | Miquel Nofrarias | M. Nofrarias, C. R\"over, M. Hewitson, A. Monsky, G. Heinzel, K.
Danzmann, L. Ferraioli, M. Hueller, S. Vitale | Bayesian parameter estimation in the second LISA Pathfinder Mock Data
Challenge | 14 pages, 4 figures, submitted to PRD | Phys.Rev.D82:122002,2010 | 10.1103/PhysRevD.82.122002 | null | gr-qc physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A main scientific output of the LISA Pathfinder mission is to provide a noise
model that can be extended to the future gravitational wave observatory, LISA.
The success of the mission depends thus upon a deep understanding of the
instrument, especially the ability to correctly determine the parameters of the
underlyi... | [
{
"created": "Tue, 31 Aug 2010 10:48:38 GMT",
"version": "v1"
}
] | 2010-12-28 | [
[
"Nofrarias",
"M.",
""
],
[
"Röver",
"C.",
""
],
[
"Hewitson",
"M.",
""
],
[
"Monsky",
"A.",
""
],
[
"Heinzel",
"G.",
""
],
[
"Danzmann",
"K.",
""
],
[
"Ferraioli",
"L.",
""
],
[
"Hueller",
"M.",... | A main scientific output of the LISA Pathfinder mission is to provide a noise model that can be extended to the future gravitational wave observatory, LISA. The success of the mission depends thus upon a deep understanding of the instrument, especially the ability to correctly determine the parameters of the underlying... |
gr-qc/9503047 | Piljin Yi | Piljin Yi | Vanishing Hawking Radiation from a Uniformly Accelerated Black Hole | LaTeX, 10pages, 2 figures (a typo in Eq.(3) corrected; minor
revisions to accomodate the length limitation of the journal) | Phys.Rev.Lett. 75 (1995) 382-385 | 10.1103/PhysRevLett.75.382 | CU-TP-683 | gr-qc hep-ph hep-th | null | We consider quantum fields around uniformly accelerated black holes. At a
particular value of the acceleration, the Bogolubov transformation which would
be responsible for the late-time Hawking radiation, is found to be trivial.
When this happens, Hawking's thermal radiation, Doppler-shifted or not, is
absent to the ... | [
{
"created": "Sun, 26 Mar 1995 21:21:39 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Jul 1995 13:39:03 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Yi",
"Piljin",
""
]
] | We consider quantum fields around uniformly accelerated black holes. At a particular value of the acceleration, the Bogolubov transformation which would be responsible for the late-time Hawking radiation, is found to be trivial. When this happens, Hawking's thermal radiation, Doppler-shifted or not, is absent to the as... |
2312.05065 | Luca Santoni | Massimiliano Maria Riva, Luca Santoni, Nikola Savi\'c and Filippo
Vernizzi | Vanishing of Nonlinear Tidal Love Numbers of Schwarzschild Black Holes | 11 pages, 3 figures | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | It is well known that asymptotically flat Schwarzschild black holes in
general relativity in four spacetime dimensions have vanishing induced linear
tidal response. We extend this result beyond linear order for the polar sector,
by solving the static nonlinear Einstein equations for the perturbations of the
Schwarzsc... | [
{
"created": "Fri, 8 Dec 2023 14:35:21 GMT",
"version": "v1"
},
{
"created": "Tue, 28 May 2024 13:21:55 GMT",
"version": "v2"
}
] | 2024-05-29 | [
[
"Riva",
"Massimiliano Maria",
""
],
[
"Santoni",
"Luca",
""
],
[
"Savić",
"Nikola",
""
],
[
"Vernizzi",
"Filippo",
""
]
] | It is well known that asymptotically flat Schwarzschild black holes in general relativity in four spacetime dimensions have vanishing induced linear tidal response. We extend this result beyond linear order for the polar sector, by solving the static nonlinear Einstein equations for the perturbations of the Schwarzschi... |
1404.5821 | Aurelien Barrau | Aurelien Barrau and Carlo Rovelli | Planck star phenomenology | 5 pages, 4 figues | Physics Letters B 739 (2014) 405 | 10.1016/j.physletb.2014.11.020 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is possible that black holes hide a core of Planckian density, sustained
by quantum-gravitational pressure. As a black hole evaporates, the core
remembers the initial mass and the final explosion occurs at macroscopic scale.
We investigate possible phenomenological consequences of this idea. Under
several rough as... | [
{
"created": "Wed, 23 Apr 2014 13:38:41 GMT",
"version": "v1"
},
{
"created": "Sat, 3 May 2014 09:21:43 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Barrau",
"Aurelien",
""
],
[
"Rovelli",
"Carlo",
""
]
] | It is possible that black holes hide a core of Planckian density, sustained by quantum-gravitational pressure. As a black hole evaporates, the core remembers the initial mass and the final explosion occurs at macroscopic scale. We investigate possible phenomenological consequences of this idea. Under several rough assu... |
2302.04808 | Richard Woodard | E. Kasdagli, Martha Ulloa and R. P. Woodard | Coincident Massless, Minimally Coupled Scalar Correlators on General
Cosmological Backgrounds | 30 pages, 5 figures, uses LaTeX2e, Version 2 revised for publication
with improved figures and length of 34 pages | Phys. Rev. D107 (2023) 105023 | 10.1103/PhysRevD.107.105023 | UFIFT-QG-23-02 | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | The coincidence limits of the massless, minimally coupled scalar propagator
and its first two derivatives have great relevance for the project of summing
up the leading logarithms induced by loops of inflationary gravitons. We use
dimensional regularization to derive good analytic approximations for the three
quantit... | [
{
"created": "Thu, 9 Feb 2023 17:56:34 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Jun 2023 03:18:46 GMT",
"version": "v2"
}
] | 2023-06-02 | [
[
"Kasdagli",
"E.",
""
],
[
"Ulloa",
"Martha",
""
],
[
"Woodard",
"R. P.",
""
]
] | The coincidence limits of the massless, minimally coupled scalar propagator and its first two derivatives have great relevance for the project of summing up the leading logarithms induced by loops of inflationary gravitons. We use dimensional regularization to derive good analytic approximations for the three quantitie... |
1405.0363 | Christodoulakis Theodosios | T. Christodoulakis, N. Dimakis, Petros A. Terzis and G. Doulis | Canonical Quantization of the BTZ Black Hole using Noether Symmetries | 24 pages, no figures, LaTeX 2e source file | null | 10.1103/PhysRevD.90.024052 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The well-known BTZ black hole solution of (2+1) Einstein's gravity, in the
presence of a cosmological constant, is treated both at the classical and
quantum level. Classically, the imposition of the two manifest local Killing
fields of the BTZ geometry at the level of the full action results in a
mini-superspace cons... | [
{
"created": "Fri, 2 May 2014 09:21:15 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Christodoulakis",
"T.",
""
],
[
"Dimakis",
"N.",
""
],
[
"Terzis",
"Petros A.",
""
],
[
"Doulis",
"G.",
""
]
] | The well-known BTZ black hole solution of (2+1) Einstein's gravity, in the presence of a cosmological constant, is treated both at the classical and quantum level. Classically, the imposition of the two manifest local Killing fields of the BTZ geometry at the level of the full action results in a mini-superspace constr... |
gr-qc/0204061 | Alexander Vilenkin | Alexander Vilenkin | Quantum cosmology and eternal inflation | To appear in "The Future of Theoretical Physics and Cosmology",
proceedings of the conference in honor of Stephen Hawking's 60'th birthday | null | null | null | gr-qc | null | This contribution consists of two parts. In the first part, I review the
tunneling approach to quantum cosmology and comment on the alternative
approaches. In the second part, I discuss the relation between quantum
cosmology and eternal inflation. In particular, I discuss whether or not we
need quantum cosmology in t... | [
{
"created": "Thu, 18 Apr 2002 21:13:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Vilenkin",
"Alexander",
""
]
] | This contribution consists of two parts. In the first part, I review the tunneling approach to quantum cosmology and comment on the alternative approaches. In the second part, I discuss the relation between quantum cosmology and eternal inflation. In particular, I discuss whether or not we need quantum cosmology in the... |
1401.0774 | Joseph Samuel | Supurna Sinha and Joseph Samuel | Quantum Limit on Stability of Clocks in a Gravitational Field | 10 pages, 2 figures, 1 table, ms improved and tightened after
discussions, references and acknowledgements inserted, clock instability
emphasized not decoherence | null | 10.1088/0264-9381/32/1/015018 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Good clocks are of importance both to fundamental physics and for
applications in astronomy, metrology and global positioning systems. In a
recent technological breakthrough, researchers at NIST have been able to
achieve a stability of 1 part in $10^{18}$ using an Ytterbium clock. This
naturally raises the question o... | [
{
"created": "Sat, 4 Jan 2014 04:30:21 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Mar 2014 06:20:19 GMT",
"version": "v2"
},
{
"created": "Fri, 21 Mar 2014 10:39:08 GMT",
"version": "v3"
}
] | 2015-06-18 | [
[
"Sinha",
"Supurna",
""
],
[
"Samuel",
"Joseph",
""
]
] | Good clocks are of importance both to fundamental physics and for applications in astronomy, metrology and global positioning systems. In a recent technological breakthrough, researchers at NIST have been able to achieve a stability of 1 part in $10^{18}$ using an Ytterbium clock. This naturally raises the question of ... |
2003.05657 | Ji-Yao Wang | Ji-Yao Wang, Chao-Jun Feng, Xiang-Hua Zhai, and Xin-Zhou Li | Dynamics of Viscous Phantom Universe | 14 pages, 7 figures | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The phantom dark energy remarkably boosts our prehension of the accelerating
Universe. Various models are widely discussed in the phantom Universe without
bulk viscosity. From the hydrodynamics' point of view, it is natural to
introduce the nonperfect fluid in the study of the Universe, as an ideal fluid
just an appr... | [
{
"created": "Thu, 12 Mar 2020 08:18:53 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Mar 2020 09:30:53 GMT",
"version": "v2"
},
{
"created": "Tue, 9 Jun 2020 07:33:54 GMT",
"version": "v3"
}
] | 2020-06-11 | [
[
"Wang",
"Ji-Yao",
""
],
[
"Feng",
"Chao-Jun",
""
],
[
"Zhai",
"Xiang-Hua",
""
],
[
"Li",
"Xin-Zhou",
""
]
] | The phantom dark energy remarkably boosts our prehension of the accelerating Universe. Various models are widely discussed in the phantom Universe without bulk viscosity. From the hydrodynamics' point of view, it is natural to introduce the nonperfect fluid in the study of the Universe, as an ideal fluid just an approx... |
1901.07383 | Rhiannon Cuttell | Rhiannon Cuttell and Mairi Sakellariadou | The general gravitational Lagrangian with deformed covariance | 15 pages, 2 figures. arXiv admin note: text overlap with
arXiv:1812.07530 | Phys. Rev. D 102, 104048 (2020) | 10.1103/PhysRevD.102.104048 | KCL-PH-TH/2019-08 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the gravitational Lagrangian to all orders of curvature when the
canonical constraint algebra is deformed by a phase space function as predicted
by some studies into loop quantum cosmology. The deformation function seems to
be required to satisfy a non-linear equation usually found in fluid mechanics,
and c... | [
{
"created": "Fri, 18 Jan 2019 16:54:58 GMT",
"version": "v1"
}
] | 2020-11-25 | [
[
"Cuttell",
"Rhiannon",
""
],
[
"Sakellariadou",
"Mairi",
""
]
] | We derive the gravitational Lagrangian to all orders of curvature when the canonical constraint algebra is deformed by a phase space function as predicted by some studies into loop quantum cosmology. The deformation function seems to be required to satisfy a non-linear equation usually found in fluid mechanics, and can... |
2404.06870 | Sanjar Shaymatov | Sanjar Shaymatov, Naresh Dadhich, Arman Tursunov | Energetics of Buchdahl stars and the magnetic Penrose process | 10 pages, 4 captioned figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Buchdahl star is the most compact object without an event horizon and is an
excellent candidate for a black hole mimicker. Unlike black holes, rotating
Buchdahl star can be over-extremal with respect to the black hole, sustaining a
larger spin. We show that it can also develop an ergosphere above the threshold
spin $... | [
{
"created": "Wed, 10 Apr 2024 09:47:55 GMT",
"version": "v1"
}
] | 2024-04-11 | [
[
"Shaymatov",
"Sanjar",
""
],
[
"Dadhich",
"Naresh",
""
],
[
"Tursunov",
"Arman",
""
]
] | Buchdahl star is the most compact object without an event horizon and is an excellent candidate for a black hole mimicker. Unlike black holes, rotating Buchdahl star can be over-extremal with respect to the black hole, sustaining a larger spin. We show that it can also develop an ergosphere above the threshold spin $\b... |
1610.02720 | Alexei Zayats | Alexei E. Zayats | Self-interaction in the Bopp-Podolsky electrodynamics: Spacetimes with
angular defects | 9 pages, 2 figures, final version | Phys. Rev. D 94, 105026 (2016) | 10.1103/PhysRevD.94.105026 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the self-interaction phenomenon in the framework of the
Bopp-Podolsky electrodynamics. In the present paper, we obtain the
self-interaction potential energy of a charge at rest for the spacetimes with
topological defects of two types: for the axially symmetric spacetime of the
straight cosmic string and t... | [
{
"created": "Sun, 9 Oct 2016 21:00:57 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Nov 2016 18:17:34 GMT",
"version": "v2"
}
] | 2016-11-29 | [
[
"Zayats",
"Alexei E.",
""
]
] | We consider the self-interaction phenomenon in the framework of the Bopp-Podolsky electrodynamics. In the present paper, we obtain the self-interaction potential energy of a charge at rest for the spacetimes with topological defects of two types: for the axially symmetric spacetime of the straight cosmic string and the... |
1508.02306 | Muhammad Sharif | M. Sharif and Rubab Manzoor | Hydrodynamics of Gaseous System in Massive Brans-Dicke Gravity | 22 pages, no figure, title is changed, some instability conditions
are developed, references are updated | Eur. Phys. J. Plus 131 (2016)64 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper explores hydrodynamics and hydrostatic of a star in post-Newtonian
approximation of massive Bran-Dicke gravity. We study approximated solution of
the field equations upto $O(c^{-4})$ and generalize Euler equation of motion.
We then formulate equations governing hydrodynamics, stability and instability
of t... | [
{
"created": "Fri, 7 Aug 2015 10:58:33 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Oct 2015 09:08:37 GMT",
"version": "v2"
}
] | 2016-05-11 | [
[
"Sharif",
"M.",
""
],
[
"Manzoor",
"Rubab",
""
]
] | This paper explores hydrodynamics and hydrostatic of a star in post-Newtonian approximation of massive Bran-Dicke gravity. We study approximated solution of the field equations upto $O(c^{-4})$ and generalize Euler equation of motion. We then formulate equations governing hydrodynamics, stability and instability of the... |
gr-qc/9711030 | Larry Ford | L.H. Ford, Michael J. Pfenning and Thomas A. Roman | Quantum Inequalities and Singular Energy Densities | 18 pages, LaTex, 2 figures, uses epsf | Phys. Rev. D 57, 4839 (1998) | 10.1103/PhysRevD.57.4839 | TUTP-97-11 | gr-qc hep-th quant-ph | null | There has been much recent work on quantum inequalities to constrain negative
energy. These are uncertainty principle-type restrictions on the magnitude and
duration of negative energy densities or fluxes. We consider several examples
of apparent failures of the quantum inequalities, which involve passage of an
obser... | [
{
"created": "Mon, 10 Nov 1997 00:20:31 GMT",
"version": "v1"
}
] | 2016-08-25 | [
[
"Ford",
"L. H.",
""
],
[
"Pfenning",
"Michael J.",
""
],
[
"Roman",
"Thomas A.",
""
]
] | There has been much recent work on quantum inequalities to constrain negative energy. These are uncertainty principle-type restrictions on the magnitude and duration of negative energy densities or fluxes. We consider several examples of apparent failures of the quantum inequalities, which involve passage of an observe... |
1608.07466 | Yongwan Gim | Yongwan Gim and Wontae Kim | On the thermodynamic origin of the initial radiation energy density in
warm inflation | 17 pages, 1 figure, version to appear in JCAP | JCAP, 11 (2016) 022 | 10.1088/1475-7516/2016/11/022 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In warm inflation scenarios, radiation always exists, so that the radiation
energy density is also assumed to be finite when inflation starts. To find out
the origin of the non-vanishing initial radiation energy density, we revisit
thermodynamic analysis for a warm inflation model and then derive an effective
Stefan-... | [
{
"created": "Tue, 23 Aug 2016 02:38:57 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Nov 2016 08:24:03 GMT",
"version": "v2"
}
] | 2016-11-11 | [
[
"Gim",
"Yongwan",
""
],
[
"Kim",
"Wontae",
""
]
] | In warm inflation scenarios, radiation always exists, so that the radiation energy density is also assumed to be finite when inflation starts. To find out the origin of the non-vanishing initial radiation energy density, we revisit thermodynamic analysis for a warm inflation model and then derive an effective Stefan-Bo... |
gr-qc/9703042 | Jorge Pullin | Rodolfo Gambini, Jorge Griego and Jorge Pullin | Chern--Simons states in spin-network quantum gravity | 8 pages, RevTeX, 17 figures included | Phys.Lett. B413 (1997) 260-266 | 10.1016/S0370-2693(97)01048-4 | CGPG-97/3-4 | gr-qc | null | In the context of canonical quantum gravity in terms of Ashtekar's new
variables, it is known that there exists a state that is annihilated by all the
quantum constraints and that is given by the exponential of the Chern--Simons
form constructed with the Asthekar connection. We make a first exploration of
the transfo... | [
{
"created": "Mon, 17 Mar 1997 21:25:50 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Gambini",
"Rodolfo",
""
],
[
"Griego",
"Jorge",
""
],
[
"Pullin",
"Jorge",
""
]
] | In the context of canonical quantum gravity in terms of Ashtekar's new variables, it is known that there exists a state that is annihilated by all the quantum constraints and that is given by the exponential of the Chern--Simons form constructed with the Asthekar connection. We make a first exploration of the transform... |
1402.0704 | Fabio Briscese | Fabio Briscese and Francesco Calogero | Isochronous Cosmologies | null | IJGMMP Vol. 11 (2014) 1450054 (19 pages) | 10.1142/S0219887814500546 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The possibility has been recently demonstrated to manufacture
(nonrelativistic, Hamiltonian) many-body problems which feature an isochronous
time evolution with an arbitrarily assigned period $T$ yet mimic with good
approximation, or even exactly, any given many-body problem (within a large,
physically relevant, clas... | [
{
"created": "Tue, 4 Feb 2014 12:01:41 GMT",
"version": "v1"
},
{
"created": "Tue, 6 May 2014 15:53:41 GMT",
"version": "v2"
}
] | 2014-05-07 | [
[
"Briscese",
"Fabio",
""
],
[
"Calogero",
"Francesco",
""
]
] | The possibility has been recently demonstrated to manufacture (nonrelativistic, Hamiltonian) many-body problems which feature an isochronous time evolution with an arbitrarily assigned period $T$ yet mimic with good approximation, or even exactly, any given many-body problem (within a large, physically relevant, class)... |
gr-qc/0502081 | Rituparno Goswami | T. Arun Madhav, Rituparno Goswami, Pankaj S. Joshi | Gravitational collapse in asymptotically Anti-de Sitter/de Sitter
backgrounds | 11 pages, 1 figure, Revtex4 | Phys.Rev. D72 (2005) 084029 | 10.1103/PhysRevD.72.084029 | null | gr-qc hep-th | null | We study here the gravitational collapse of a matter cloud with a
non-vanishing tangential pressure in the presence of a non-zero cosmological
term. Conditions for bounce and singularity formation are derived for the
model. It is also shown that when the tangential pressures vanish, the bounce
and singularity conditi... | [
{
"created": "Sat, 19 Feb 2005 15:53:23 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Madhav",
"T. Arun",
""
],
[
"Goswami",
"Rituparno",
""
],
[
"Joshi",
"Pankaj S.",
""
]
] | We study here the gravitational collapse of a matter cloud with a non-vanishing tangential pressure in the presence of a non-zero cosmological term. Conditions for bounce and singularity formation are derived for the model. It is also shown that when the tangential pressures vanish, the bounce and singularity condition... |
2405.02709 | Jared Fuchs | Jared Fuchs, Christopher Helmerich, Alexey Bobrick, Luke Sellers,
Brandon Melcher, Gianni Martire | Constant Velocity Physical Warp Drive Solution | null | Jared Fuchs et al 2024 Class. Quantum Grav. 41 095013 | 10.1088/1361-6382/ad26aa | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Warp drives are exotic solutions of general relativity that offer novel means
of transportation. In this study, we present a solution for a constant-velocity
subluminal warp drive that satisfies all of the energy conditions. The solution
involves combining a stable matter shell with a shift vector distribution that
c... | [
{
"created": "Sat, 4 May 2024 16:44:49 GMT",
"version": "v1"
}
] | 2024-05-07 | [
[
"Fuchs",
"Jared",
""
],
[
"Helmerich",
"Christopher",
""
],
[
"Bobrick",
"Alexey",
""
],
[
"Sellers",
"Luke",
""
],
[
"Melcher",
"Brandon",
""
],
[
"Martire",
"Gianni",
""
]
] | Warp drives are exotic solutions of general relativity that offer novel means of transportation. In this study, we present a solution for a constant-velocity subluminal warp drive that satisfies all of the energy conditions. The solution involves combining a stable matter shell with a shift vector distribution that clo... |
1111.4009 | Michael Horbatsch W | M. W. Horbatsch and C. P. Burgess | Cosmic Black-Hole Hair Growth and Quasar OJ287 | 20 pages | JCAP 1205 (2012) 010 | 10.1088/1475-7516/2012/05/010 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An old result ({\tt astro-ph/9905303}) by Jacobson implies that a black hole
with Schwarzschild radius $r_s$ acquires scalar hair, $Q \propto r_s^2 \mu$,
when the (canonically normalized) scalar field in question is slowly
time-dependent far from the black hole, $\partial_t \phi \simeq \mu M_p$ with
$\mu r_s \ll 1$ t... | [
{
"created": "Thu, 17 Nov 2011 02:26:12 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Horbatsch",
"M. W.",
""
],
[
"Burgess",
"C. P.",
""
]
] | An old result ({\tt astro-ph/9905303}) by Jacobson implies that a black hole with Schwarzschild radius $r_s$ acquires scalar hair, $Q \propto r_s^2 \mu$, when the (canonically normalized) scalar field in question is slowly time-dependent far from the black hole, $\partial_t \phi \simeq \mu M_p$ with $\mu r_s \ll 1$ tim... |
1510.01126 | Irina Dymnikova | Irina Dymnikova | Elementary Superconductivity in Nonlinear Electrodynamics Coupled to
Gravity | 10 pages, 1 figure | Journal of Gravity Volume 2015, Article ID 904171, 7 pages | 10.1155/2015/904171 | null | gr-qc cond-mat.supr-con | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Source-free equations of nonlinear electrodynamics minimally coupled to
gravity admit regular axially symmetric asymptotically Kerr-Newman solutions
which describe charged rotating black holes and electromagnetic spinning
solitons (lumps). Asymptotic analysis of solutions shows, for both black holes
and solitons, the... | [
{
"created": "Mon, 5 Oct 2015 12:25:29 GMT",
"version": "v1"
}
] | 2015-10-06 | [
[
"Dymnikova",
"Irina",
""
]
] | Source-free equations of nonlinear electrodynamics minimally coupled to gravity admit regular axially symmetric asymptotically Kerr-Newman solutions which describe charged rotating black holes and electromagnetic spinning solitons (lumps). Asymptotic analysis of solutions shows, for both black holes and solitons, the e... |
0805.4033 | Slava G. Turyshev | Slava G. Turyshev, Benjamin Lane, Michael Shao, and Andre Girerd | A Search for New Physics with the BEACON Mission | 8 pages, 2 figures, 2 tables | Int.J.Mod.Phys.D18:1025-1038,2009 | 10.1142/S0218271809014893 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The primary objective of the Beyond Einstein Advanced Coherent Optical
Network (BEACON) mission is a search for new physics beyond general relativity
by measuring the curvature of relativistic space-time around Earth. This
curvature is characterized by the Eddington parameter \gamma -- the most
fundamental relativist... | [
{
"created": "Tue, 27 May 2008 02:45:07 GMT",
"version": "v1"
}
] | 2009-07-22 | [
[
"Turyshev",
"Slava G.",
""
],
[
"Lane",
"Benjamin",
""
],
[
"Shao",
"Michael",
""
],
[
"Girerd",
"Andre",
""
]
] | The primary objective of the Beyond Einstein Advanced Coherent Optical Network (BEACON) mission is a search for new physics beyond general relativity by measuring the curvature of relativistic space-time around Earth. This curvature is characterized by the Eddington parameter \gamma -- the most fundamental relativistic... |
0711.0288 | Edward Anderson | Edward Anderson | New interpretation of variational principles for gauge theories. I.
Cyclic coordinate alternative to ADM split | 11 pages | Class.Quant.Grav.25:175011,2008 | 10.1088/0264-9381/25/17/175011 | null | gr-qc | null | I show how there is an ambiguity in how one treats auxiliary variables in
gauge theories including general relativity cast as 3 + 1 geometrodynamics.
Auxiliary variables may be treated pre-variationally as multiplier coordinates
or as the velocities corresponding to cyclic coordinates. The latter treatment
works thro... | [
{
"created": "Fri, 2 Nov 2007 11:30:05 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Anderson",
"Edward",
""
]
] | I show how there is an ambiguity in how one treats auxiliary variables in gauge theories including general relativity cast as 3 + 1 geometrodynamics. Auxiliary variables may be treated pre-variationally as multiplier coordinates or as the velocities corresponding to cyclic coordinates. The latter treatment works throug... |
gr-qc/0301026 | Iver. H. Brevik | Iver Brevik | Viscous Cosmology and the Cardy-Verlinde Formula | 10 pages, no figures. Contribution to the Proceedings of the Second
Londrina Winter School "Mathematical Methods in Physics", August 25-30, 2002,
Londrina-Parana, Brazil | Int.J.Mod.Phys.A18:2145-2152,2003 | 10.1142/S0217751X03015593 | null | gr-qc | null | The holographic principle in a radiation dominated universe is extended to
incorporate the case of a bulk-viscous cosmic fluid. This corresponds to a
nonconformally invariant theory. Generalization of the Cardy-Verlinde entropy
formula to the viscous case appears to be possible from a formal point of view,
although w... | [
{
"created": "Wed, 8 Jan 2003 12:35:52 GMT",
"version": "v1"
}
] | 2009-01-14 | [
[
"Brevik",
"Iver",
""
]
] | The holographic principle in a radiation dominated universe is extended to incorporate the case of a bulk-viscous cosmic fluid. This corresponds to a nonconformally invariant theory. Generalization of the Cardy-Verlinde entropy formula to the viscous case appears to be possible from a formal point of view, although we ... |
0902.4439 | Tonatiuh Matos | Tonatiuh Matos | Class of Einstein-Maxwell Phantom Fields: Rotating and Magnetised
Wormholes | 15 pages, no figures | Gen.Rel.Grav.42:1969-1990,2010 | 10.1007/s10714-010-0976-6 | CIEA/09-gr5 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using a new ansatz for solving the Einstein equations with a scalar field
with the sign of the kinetic term inverted, I find a series of formulae to
derive axial symmetric stationary exact solutions of the Phantom scalar field
in general relativity. We focus on the solutions which represent wormholes. The
procedure p... | [
{
"created": "Wed, 25 Feb 2009 18:43:22 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Matos",
"Tonatiuh",
""
]
] | Using a new ansatz for solving the Einstein equations with a scalar field with the sign of the kinetic term inverted, I find a series of formulae to derive axial symmetric stationary exact solutions of the Phantom scalar field in general relativity. We focus on the solutions which represent wormholes. The procedure pre... |
2402.03154 | Gaoping Long | Gaoping Long, Hongguang Liu | Holonomy operator for spin connection and spatial scalar curvature
operator in loop quantum gravity | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | In this article we propose a new construction of the spatial scalar curvature
operator in (1+3)-dimensional LQG based on the twisted geometry. The starting
point of the construction is to express the holonomy of the spin connection on
a graph in terms of the twisted geometry variables, and we check that this
expressi... | [
{
"created": "Mon, 5 Feb 2024 16:19:55 GMT",
"version": "v1"
}
] | 2024-02-06 | [
[
"Long",
"Gaoping",
""
],
[
"Liu",
"Hongguang",
""
]
] | In this article we propose a new construction of the spatial scalar curvature operator in (1+3)-dimensional LQG based on the twisted geometry. The starting point of the construction is to express the holonomy of the spin connection on a graph in terms of the twisted geometry variables, and we check that this expression... |
2101.05006 | Francesco Di Filippo | Ra\'ul Carballo-Rubio, Francesco Di Filippo, Stefano Liberati,
Costantino Pacilio, Matt Visser | Inner horizon instability and the unstable cores of regular black holes | 17 pages, 5 figures. Major changes in the presentation to improve
clarity, physical conclusions unchanged, matches the version accepted on JHEP | null | 10.1007/JHEP05(2021)132 | YITP-21-02 | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Regular black holes with nonsingular cores have been considered in several
approaches to quantum gravity, and as agnostic frameworks to address the
singularity problem and Hawking's information paradox. While in a recent work
we argued that the inner core is destabilized by linear perturbations, opposite
claims were ... | [
{
"created": "Wed, 13 Jan 2021 11:17:30 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Apr 2021 09:06:25 GMT",
"version": "v2"
}
] | 2021-06-02 | [
[
"Carballo-Rubio",
"Raúl",
""
],
[
"Di Filippo",
"Francesco",
""
],
[
"Liberati",
"Stefano",
""
],
[
"Pacilio",
"Costantino",
""
],
[
"Visser",
"Matt",
""
]
] | Regular black holes with nonsingular cores have been considered in several approaches to quantum gravity, and as agnostic frameworks to address the singularity problem and Hawking's information paradox. While in a recent work we argued that the inner core is destabilized by linear perturbations, opposite claims were ra... |
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