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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1511.05581 | Antoine Klein | Antoine Klein, Enrico Barausse, Alberto Sesana, Antoine Petiteau,
Emanuele Berti, Stanislav Babak, Jonathan Gair, Sofiane Aoudia, Ian Hinder,
Frank Ohme, Barry Wardell | Science with the space-based interferometer eLISA. I: Supermassive black
hole binaries | 28 pages, 13 figures, 7 tables | Phys. Rev. D 93, 024003 (2016) | 10.1103/PhysRevD.93.024003 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compare the science capabilities of different eLISA mission designs,
including four-link (two-arm) and six-link (three-arm) configurations with
different arm lengths, low-frequency noise sensitivities and mission durations.
For each of these configurations we consider a few representative massive black
hole format... | [
{
"created": "Tue, 17 Nov 2015 21:04:55 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Jan 2016 17:42:07 GMT",
"version": "v2"
}
] | 2016-01-13 | [
[
"Klein",
"Antoine",
""
],
[
"Barausse",
"Enrico",
""
],
[
"Sesana",
"Alberto",
""
],
[
"Petiteau",
"Antoine",
""
],
[
"Berti",
"Emanuele",
""
],
[
"Babak",
"Stanislav",
""
],
[
"Gair",
"Jonathan",
""
],
... | We compare the science capabilities of different eLISA mission designs, including four-link (two-arm) and six-link (three-arm) configurations with different arm lengths, low-frequency noise sensitivities and mission durations. For each of these configurations we consider a few representative massive black hole formatio... |
gr-qc/9510040 | Serge Droz | P. R. Brady, S. Droz, W. Israel and S. M. Morsink | Covariant double-null dynamics: $(2+2)$-splitting of the Einstein
equations | 22 pages, latex, one figure in a separate file | Class.Quant.Grav. 13 (1996) 2211-2230 | 10.1088/0264-9381/13/8/015 | EFI-94-36 | gr-qc hep-th | null | The paper develops a $(2+2)$-imbedding formalism adapted to a double
foliation of spacetime by a net of two intersecting families of lightlike
hypersurfaces. The formalism is two-dimensionally covariant, and leads to
simple, geometrically transparent and tractable expressions for the Einstein
field equations and the ... | [
{
"created": "Thu, 19 Oct 1995 21:41:54 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Brady",
"P. R.",
""
],
[
"Droz",
"S.",
""
],
[
"Israel",
"W.",
""
],
[
"Morsink",
"S. M.",
""
]
] | The paper develops a $(2+2)$-imbedding formalism adapted to a double foliation of spacetime by a net of two intersecting families of lightlike hypersurfaces. The formalism is two-dimensionally covariant, and leads to simple, geometrically transparent and tractable expressions for the Einstein field equations and the Ei... |
gr-qc/0502047 | B. V. Ivanov | Boyko V. Ivanov | On the gravitational field induced by static electromagnetic sources | 18 pages, Revtex4 | null | null | null | gr-qc | null | It is argued that static electromagnetic sources induce
Weyl-Majumdar-Papapetrou solutions for the spacetime metric. The acceleration
in such fields has a term many orders of magnitude stronger than usual
perturbative terms. Two electrostatic and two magnetostatic examples are given.
| [
{
"created": "Thu, 10 Feb 2005 19:18:49 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ivanov",
"Boyko V.",
""
]
] | It is argued that static electromagnetic sources induce Weyl-Majumdar-Papapetrou solutions for the spacetime metric. The acceleration in such fields has a term many orders of magnitude stronger than usual perturbative terms. Two electrostatic and two magnetostatic examples are given. |
2407.03669 | Shubham Narawade Mr. | Muhammad Azzam Alwan, Tomohiro Inagaki, B. Mishra, S.A. Narawade | Neutron Star in Covariant $f(Q)$ gravity | 27 pages, 24 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Assuming static and spherically symmetric stars with perfect fluid matter, we
used realistic equations of state to study neutron stars in covariant $f(Q)$
gravity. The structure profiles and properties of neutron stars such as mass,
radius and compactness are obtained through numerical methods using quadratic,
expone... | [
{
"created": "Thu, 4 Jul 2024 06:33:44 GMT",
"version": "v1"
}
] | 2024-07-08 | [
[
"Alwan",
"Muhammad Azzam",
""
],
[
"Inagaki",
"Tomohiro",
""
],
[
"Mishra",
"B.",
""
],
[
"Narawade",
"S. A.",
""
]
] | Assuming static and spherically symmetric stars with perfect fluid matter, we used realistic equations of state to study neutron stars in covariant $f(Q)$ gravity. The structure profiles and properties of neutron stars such as mass, radius and compactness are obtained through numerical methods using quadratic, exponent... |
gr-qc/0309016 | Juan A. Valiente-Kroon | Juan A. Valiente Kroon | Does asymptotic simplicity allow for radiation near spatial infinity? | 22 pages, 4 figures. Typos and grammatical mistakes corrected.
Version to appear in Comm. Math. Phys | Commun.Math.Phys. 251 (2004) 211-234 | 10.1007/s00220-004-1174-8 | null | gr-qc | null | A representation of spatial infinity based in the properties of conformal
geodesics is used to obtain asymptotic expansions of the gravitational field
near the region where null infinity touches spatial infinity. These expansions
show that generic time symmetric initial data with an analytic conformal metric
at spati... | [
{
"created": "Wed, 3 Sep 2003 07:26:46 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Mar 2004 14:42:30 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Kroon",
"Juan A. Valiente",
""
]
] | A representation of spatial infinity based in the properties of conformal geodesics is used to obtain asymptotic expansions of the gravitational field near the region where null infinity touches spatial infinity. These expansions show that generic time symmetric initial data with an analytic conformal metric at spatial... |
2111.12109 | Jo\~ao Lu\'is Rosa | Jo\~ao Lu\'is Rosa, Jos\'e P. S. Lemos | Junction conditions for generalized hybrid metric-Palatini gravity with
applications | 26 pages, 3 figures | Phys. Rev. D 104, 124076 (2021) | 10.1103/PhysRevD.104.124076 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The generalized hybrid metric-Palatini gravity is a theory of gravitation
that has an action composed of a Lagrangian $f(R,\cal R)$, where $f$ is a
function of the metric Ricci scalar $R$ and a new Ricci scalar $\cal R$ formed
from a Palatini connection, plus a matter Lagrangian. This theory can be
rewritten by tradi... | [
{
"created": "Tue, 23 Nov 2021 19:02:15 GMT",
"version": "v1"
}
] | 2022-01-07 | [
[
"Rosa",
"João Luís",
""
],
[
"Lemos",
"José P. S.",
""
]
] | The generalized hybrid metric-Palatini gravity is a theory of gravitation that has an action composed of a Lagrangian $f(R,\cal R)$, where $f$ is a function of the metric Ricci scalar $R$ and a new Ricci scalar $\cal R$ formed from a Palatini connection, plus a matter Lagrangian. This theory can be rewritten by trading... |
2405.07113 | Kun Meng | Kun Meng, Hongsheng Zhang, Xi-Long Fan, Yuan Yong | Distinguish the EMRI and B-EMRI system by gravitational waves | 16 pages, 10 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Binary stars are as frequency as single stars in the Universe, and at least
70\% of the massive stars located in our Galaxy belong to a binary system. For
the first time we produce the gravitational waveforms for the extreme mass
ratio inspiral systems (EMRIs) of binary stars moving around central
supermassive black ... | [
{
"created": "Sun, 12 May 2024 00:03:59 GMT",
"version": "v1"
}
] | 2024-05-14 | [
[
"Meng",
"Kun",
""
],
[
"Zhang",
"Hongsheng",
""
],
[
"Fan",
"Xi-Long",
""
],
[
"Yong",
"Yuan",
""
]
] | Binary stars are as frequency as single stars in the Universe, and at least 70\% of the massive stars located in our Galaxy belong to a binary system. For the first time we produce the gravitational waveforms for the extreme mass ratio inspiral systems (EMRIs) of binary stars moving around central supermassive black ho... |
2308.10381 | Jose Socorro Garcia | J. Socorro, J. Juan Rosales and L. Toledo Sesma | Anisotropic fractional cosmology: K-essence theory | 26 pages, 8 figures, version to be published in fractal fractionary
journal | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In the particular configuration of the scalar field K-essence in the
Wheeler-DeWitt quantum equation, for some age in the Bianchi type I anisotropic
cosmological model, a fractional differential equation for the scalar field
arises naturally. The order of the fractional differential equation is
$\beta=\frac{2\alpha}{... | [
{
"created": "Sun, 20 Aug 2023 22:51:32 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Nov 2023 18:48:21 GMT",
"version": "v2"
}
] | 2023-11-09 | [
[
"Socorro",
"J.",
""
],
[
"Rosales",
"J. Juan",
""
],
[
"Sesma",
"L. Toledo",
""
]
] | In the particular configuration of the scalar field K-essence in the Wheeler-DeWitt quantum equation, for some age in the Bianchi type I anisotropic cosmological model, a fractional differential equation for the scalar field arises naturally. The order of the fractional differential equation is $\beta=\frac{2\alpha}{2\... |
gr-qc/9805070 | Miguel Navarro | M. Navarro | 2D dilaton gravity made compact | Latex file, no macros, 8 pages | null | null | null | gr-qc | null | We show that the equations of motion of two-dimensional dilaton gravity
conformally coupled to a scalar field can be reduced to a single non-linear
second-order partial differential equation when the coordinates are chosen to
coincide with the two scalar fields, the matter field $f$ and the dilaton
$\phi$, which are ... | [
{
"created": "Mon, 18 May 1998 20:28:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Navarro",
"M.",
""
]
] | We show that the equations of motion of two-dimensional dilaton gravity conformally coupled to a scalar field can be reduced to a single non-linear second-order partial differential equation when the coordinates are chosen to coincide with the two scalar fields, the matter field $f$ and the dilaton $\phi$, which are pr... |
2007.13761 | Adri\'an del R\'io Vega | Ivan Agullo, Vitor Cardoso, Adrian del Rio, Michele Maggiore, Jorge
Pullin | Potential gravitational-wave signatures of quantum gravity | some comments and clarifications added; published version | Phys. Rev. Lett. 126, 041302 (2021) | 10.1103/PhysRevLett.126.041302 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that gravitational-wave astronomy has the potential to inform us on
quantum aspects of black holes. Based on Bekenstein's quantization, we find
that black hole area discretization could impart observable imprints to the
gravitational-wave signal from a pair of merging black holes, affecting their
absorption p... | [
{
"created": "Mon, 27 Jul 2020 18:00:02 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Feb 2021 17:17:18 GMT",
"version": "v2"
}
] | 2021-02-09 | [
[
"Agullo",
"Ivan",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"del Rio",
"Adrian",
""
],
[
"Maggiore",
"Michele",
""
],
[
"Pullin",
"Jorge",
""
]
] | We show that gravitational-wave astronomy has the potential to inform us on quantum aspects of black holes. Based on Bekenstein's quantization, we find that black hole area discretization could impart observable imprints to the gravitational-wave signal from a pair of merging black holes, affecting their absorption pro... |
1408.4952 | Andrea Geralico | Donato Bini and Andrea Geralico | Spin-geodesic deviations in the Kerr spacetime | 19 pages, 6 figures; published version | Phys. Rev. D 84, 104012 (2011) | 10.1103/PhysRevD.84.104012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dynamics of extended spinning bodies in the Kerr spacetime is
investigated in the pole-dipole particle approximation and under the assumption
that the spin-curvature force only slightly deviates the particle from a
geodesic path. The spin parameter is thus assumed to be very small and the back
reaction on the spa... | [
{
"created": "Thu, 21 Aug 2014 10:59:38 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Bini",
"Donato",
""
],
[
"Geralico",
"Andrea",
""
]
] | The dynamics of extended spinning bodies in the Kerr spacetime is investigated in the pole-dipole particle approximation and under the assumption that the spin-curvature force only slightly deviates the particle from a geodesic path. The spin parameter is thus assumed to be very small and the back reaction on the space... |
gr-qc/9408009 | Neil Cornish | Neil Cornish | Analysis of the Non-singular Wyman-Schwarzschild Metric | 14 pages, RevTeX, 6 Figures available on request, UTPT-94-16 | Mod.Phys.Lett. A9 (1994) 3629-3640 | 10.1142/S0217732394003476 | null | gr-qc | null | The analog of the Schwarzschild metric is explored in the context of
Non-Singular Gravity. Analytic results are developed describing redshifts,
curvatures and topological features of the spacetime. All curvatures and
redshifts are finite so there are no Black Holes, no singularities and no
Hawking radiation.
| [
{
"created": "Fri, 5 Aug 1994 01:39:20 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Cornish",
"Neil",
""
]
] | The analog of the Schwarzschild metric is explored in the context of Non-Singular Gravity. Analytic results are developed describing redshifts, curvatures and topological features of the spacetime. All curvatures and redshifts are finite so there are no Black Holes, no singularities and no Hawking radiation. |
0911.1595 | Jeandrew Brink | Jeandrew Brink | Spacetime Encodings IV - The Relationship between Weyl Curvature and
Killing Tensors in Stationary Axisymmetric Vacuum Spacetimes | 15 pages | Phys.Rev.D81:022002,2010 | 10.1103/PhysRevD.81.022002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The problem of obtaining an explicit representation for the fourth invariant
of geodesic motion (generalized Carter constant) of an arbitrary stationary
axisymmetric vacuum spacetime generated from an Ernst Potential is considered.
The coupling between the non-local curvature content of the spacetime as
encoded in th... | [
{
"created": "Mon, 9 Nov 2009 06:43:59 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Brink",
"Jeandrew",
""
]
] | The problem of obtaining an explicit representation for the fourth invariant of geodesic motion (generalized Carter constant) of an arbitrary stationary axisymmetric vacuum spacetime generated from an Ernst Potential is considered. The coupling between the non-local curvature content of the spacetime as encoded in the ... |
1704.07368 | Guilherme Franzmann | Guilherme Franzmann | Varying fundamental constants: a full covariant approach and
cosmological applications | 10 pages | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We build a minimal extension of General Relativity in which Newton's
gravitational coupling, $G$, the speed of light, $c$, and the cosmological
constant, $\Lambda$, are spacetime variables. This is done while satisfying the
contracted Bianchi identity as well as the local conservation of energy
momentum tensor. A dyn... | [
{
"created": "Sun, 23 Apr 2017 21:55:13 GMT",
"version": "v1"
}
] | 2017-04-27 | [
[
"Franzmann",
"Guilherme",
""
]
] | We build a minimal extension of General Relativity in which Newton's gravitational coupling, $G$, the speed of light, $c$, and the cosmological constant, $\Lambda$, are spacetime variables. This is done while satisfying the contracted Bianchi identity as well as the local conservation of energy momentum tensor. A dynam... |
1605.05816 | Toshiaki Ono | Toshiaki Ono, Tomohito Suzuki, Hideki Asada | Nonradial stability of marginal stable circular orbits in stationary
axisymmetric spacetimes | 6 pages, 3 figures, appendix added, accepted by PRD | Phys. Rev. D 94, 064042 (2016) | 10.1103/PhysRevD.94.064042 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study linear nonradial perturbations and stability of a marginal stable
circular orbit (MSCO) such as the innermost stable circular orbit (ISCO) of a
test particle in stationary axisymmetric spacetimes which possess a reflection
symmetry with respect to the equatorial plane. The proposed approach is applied
to Ker... | [
{
"created": "Thu, 19 May 2016 05:45:31 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Sep 2016 02:13:28 GMT",
"version": "v2"
}
] | 2016-09-21 | [
[
"Ono",
"Toshiaki",
""
],
[
"Suzuki",
"Tomohito",
""
],
[
"Asada",
"Hideki",
""
]
] | We study linear nonradial perturbations and stability of a marginal stable circular orbit (MSCO) such as the innermost stable circular orbit (ISCO) of a test particle in stationary axisymmetric spacetimes which possess a reflection symmetry with respect to the equatorial plane. The proposed approach is applied to Kerr ... |
1512.04240 | Kazuhiro Yamamoto | Kazuhiro Yamamoto, Valerio Marra, Viatcheslav Mukhanov, Misao Sasaki | Perturbed Newtonian description of the Lema\^itre model with
non-negligible pressure | 23 pages, 7 figures. Version accepted for publication in JCAP | JCAP03(2016)030 | 10.1088/1475-7516/2016/03/030 | HUPD-1510, YITP-15-113 | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the validity of the Newtonian description of cosmological
perturbations using the Lemaitre model, an exact spherically symmetric solution
of Einstein's equation. This problem has been investigated in the past for the
case of a dust fluid. Here, we extend the previous analysis to the more general
case of a fl... | [
{
"created": "Mon, 14 Dec 2015 10:03:14 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Feb 2016 13:02:37 GMT",
"version": "v2"
}
] | 2016-03-18 | [
[
"Yamamoto",
"Kazuhiro",
""
],
[
"Marra",
"Valerio",
""
],
[
"Mukhanov",
"Viatcheslav",
""
],
[
"Sasaki",
"Misao",
""
]
] | We study the validity of the Newtonian description of cosmological perturbations using the Lemaitre model, an exact spherically symmetric solution of Einstein's equation. This problem has been investigated in the past for the case of a dust fluid. Here, we extend the previous analysis to the more general case of a flui... |
1809.08265 | Joao Paulo Manoel Pitelli | S. Carlip, Ricardo A. Mosna, J. P. M. Pitelli | Quantum Fields, Geometric Fluctuations, and the Structure of Spacetime | 5 pages, 5 figures. v3: major revision. The fluctuations of the
stress-energy tensor are now allowed to act independently on different
spacetime patches. The text has been updated accordingly. v4: typos
corrected, final published version | Phys. Rev. D 102, 126018 (2020) | 10.1103/PhysRevD.102.126018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum fluctuations of the vacuum stress-energy tensor are highly
non-Gaussian, and can have unexpectedly large effects on spacetime geometry. In
this paper, we study a two-dimensional dilaton gravity model coupled to a
conformal field, in which the distribution of vacuum fluctuations is well
understood. In this mod... | [
{
"created": "Fri, 21 Sep 2018 18:38:49 GMT",
"version": "v1"
},
{
"created": "Sat, 13 Oct 2018 19:39:04 GMT",
"version": "v2"
},
{
"created": "Tue, 6 Oct 2020 11:16:09 GMT",
"version": "v3"
},
{
"created": "Thu, 17 Dec 2020 13:22:44 GMT",
"version": "v4"
}
] | 2020-12-18 | [
[
"Carlip",
"S.",
""
],
[
"Mosna",
"Ricardo A.",
""
],
[
"Pitelli",
"J. P. M.",
""
]
] | Quantum fluctuations of the vacuum stress-energy tensor are highly non-Gaussian, and can have unexpectedly large effects on spacetime geometry. In this paper, we study a two-dimensional dilaton gravity model coupled to a conformal field, in which the distribution of vacuum fluctuations is well understood. In this model... |
gr-qc/0106001 | Alexander Feinstein | Alexander Feinstein | Some aspects of pre big bang cosmology | 15 pages, a course given at the Fourth Mexican School on Gravitation
and Mathematical Physics in Huatulco, Mexico | Rev.Mex.Fis.49S1:30-37,2003 | null | null | gr-qc hep-th | null | This is a summary of a course given at the Fourth Mexican School on
Gravitation and Mathematical Physics on some aspects of PBB cosmology. After
introductory remarks the lectures concentrate on some amusing consequences
derived from the symmetries of the string theory with respect to such classical
concepts as isotro... | [
{
"created": "Fri, 1 Jun 2001 10:37:32 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Feinstein",
"Alexander",
""
]
] | This is a summary of a course given at the Fourth Mexican School on Gravitation and Mathematical Physics on some aspects of PBB cosmology. After introductory remarks the lectures concentrate on some amusing consequences derived from the symmetries of the string theory with respect to such classical concepts as isotropy... |
gr-qc/9804002 | Leonard Parker | Leonard Parker | Testable Consequences of Curved-Spacetime Renormalization | RevTeX, 7 pages, new title, major revisions, submitted to PRL | null | null | WISC-MILW-98-TH-14 | gr-qc astro-ph hep-th | null | I consider certain renormalization effects in curved spacetime quantum field
theory. In the very early universe these effects resemble those of a
cosmological constant, while in the present universe they give rise to a
significant finite renormalization of the gravitational constant. The relevant
renormalization term... | [
{
"created": "Wed, 1 Apr 1998 19:43:17 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Apr 1998 19:17:39 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Parker",
"Leonard",
""
]
] | I consider certain renormalization effects in curved spacetime quantum field theory. In the very early universe these effects resemble those of a cosmological constant, while in the present universe they give rise to a significant finite renormalization of the gravitational constant. The relevant renormalization term a... |
2212.01512 | Puxun Wu | Jincheng Wang, Hongwei Yu and Puxun Wu | Cosmological Complexity from initial thermal state | 20 pages, 5 figures | null | null | null | gr-qc quant-ph | http://creativecommons.org/licenses/by/4.0/ | The cosmological scalar perturbations should satisfy the thermal distribution
at the beginning of inflation since the cosmic temperature is presumably very
high. In this paper, we investigate, by the Fubini-study method, the effect of
this thermal contribution, which is characterized by a parameter $\kappa_{0}$,
on t... | [
{
"created": "Sat, 3 Dec 2022 02:32:02 GMT",
"version": "v1"
}
] | 2022-12-06 | [
[
"Wang",
"Jincheng",
""
],
[
"Yu",
"Hongwei",
""
],
[
"Wu",
"Puxun",
""
]
] | The cosmological scalar perturbations should satisfy the thermal distribution at the beginning of inflation since the cosmic temperature is presumably very high. In this paper, we investigate, by the Fubini-study method, the effect of this thermal contribution, which is characterized by a parameter $\kappa_{0}$, on the... |
1908.02927 | Gihyuk Cho | Gihyuk Cho, Hyung Mok Lee | Analytic Keplerian-type parametrization for general spinning compact
binaries with the leading order spin-orbit interaction | null | null | 10.1103/PhysRevD.100.044046 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a fully analytic Keplerian-type parametrization solution to
conservative motion of spinning binary in ADM gauge. This solution is able to
describe three dimensional motion of binaries of arbitrary eccentricity, mass
ratio and initial configuration of spin angular momentum up to the leading
order of post-New... | [
{
"created": "Thu, 8 Aug 2019 04:26:33 GMT",
"version": "v1"
}
] | 2019-09-11 | [
[
"Cho",
"Gihyuk",
""
],
[
"Lee",
"Hyung Mok",
""
]
] | We derive a fully analytic Keplerian-type parametrization solution to conservative motion of spinning binary in ADM gauge. This solution is able to describe three dimensional motion of binaries of arbitrary eccentricity, mass ratio and initial configuration of spin angular momentum up to the leading order of post-Newto... |
2204.06210 | Jainendra Kumar Singh Dr. | J. K. Singh, Shaily and Kazuharu Bamba | Bouncing universe in Gauss-Bonnet gravity | 13 pages, 11 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper, a bouncing cosmological scenario is studied in the background
of a flat FLRW model with a specific parametrized hyperbolic form of scale
factor $ a $ in terms of $ t $, where $ \lambda $ is taken as the model
parameter. This model is discussed in $ f(R,G) $ formalism having structured as
$ f(R,G)=R+F(G... | [
{
"created": "Wed, 13 Apr 2022 07:32:38 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Apr 2022 15:59:22 GMT",
"version": "v2"
},
{
"created": "Tue, 9 Aug 2022 07:02:11 GMT",
"version": "v3"
},
{
"created": "Wed, 10 Aug 2022 18:35:48 GMT",
"version": "v4"
}
] | 2022-08-12 | [
[
"Singh",
"J. K.",
""
],
[
"Shaily",
"",
""
],
[
"Bamba",
"Kazuharu",
""
]
] | In this paper, a bouncing cosmological scenario is studied in the background of a flat FLRW model with a specific parametrized hyperbolic form of scale factor $ a $ in terms of $ t $, where $ \lambda $ is taken as the model parameter. This model is discussed in $ f(R,G) $ formalism having structured as $ f(R,G)=R+F(G) ... |
2005.12724 | Matthew J. Lake Dr | Matthew J. Lake | Why space could be quantised on a different scale to matter | 5 pages of main text summarising the contents of a talk given at the
4th International Conference on Holography, String Theory and Discrete
Approach, Hanoi, 3rd-8th August 2020, plus an appendix giving technical the
details of the model. No figures. Published version | SciPost Phys. Proc. 4, 014 (2021) | 10.21468/SciPostPhysProc.4.014 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The scale of quantum mechanical effects in matter is set by Planck's
constant, $\hbar$. This represents the quantisation scale for material objects.
In this article, we present a simple argument why the quantisation scale for
space, and hence for gravity, may not be equal to $\hbar$. Indeed, assuming a
single quantis... | [
{
"created": "Tue, 26 May 2020 13:51:30 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Sep 2020 12:42:37 GMT",
"version": "v2"
},
{
"created": "Mon, 16 Aug 2021 10:55:53 GMT",
"version": "v3"
}
] | 2021-08-17 | [
[
"Lake",
"Matthew J.",
""
]
] | The scale of quantum mechanical effects in matter is set by Planck's constant, $\hbar$. This represents the quantisation scale for material objects. In this article, we present a simple argument why the quantisation scale for space, and hence for gravity, may not be equal to $\hbar$. Indeed, assuming a single quantisat... |
gr-qc/0512048 | Daniele Oriti | Daniele Oriti | Quantum gravity as a group field theory: a sketch | jpconf; 8 pages, 9 figures; to appear in the Proceedings of the
Fourth Meeting on Constrained Dynamics and Quantum Gravity, Cala Gonone,
Italy, September 12-16, 2005 | J.Phys.Conf.Ser. 33 (2006) 271-278 | 10.1088/1742-6596/33/1/030 | DAMTP-2005-123 | gr-qc | null | We give a very brief introduction to the group field theory approach to
quantum gravity, a generalisation of matrix models for 2-dimensional quantum
gravity to higher dimension, that has emerged recently from research in spin
foam models.
| [
{
"created": "Wed, 7 Dec 2005 18:42:19 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Oriti",
"Daniele",
""
]
] | We give a very brief introduction to the group field theory approach to quantum gravity, a generalisation of matrix models for 2-dimensional quantum gravity to higher dimension, that has emerged recently from research in spin foam models. |
gr-qc/0606096 | D. F. Mota | A. Balaguera-Antolinez, D. F. Mota and M. Nowakowski | Ellipsoidal configurations in the de Sitter spacetime | 15 pages, 11 figures, published in Class. Quant. Grav. References
added | Class.Quant.Grav. 23 (2006) 4497-4510 | 10.1088/0264-9381/23/13/013 | null | gr-qc | null | The cosmological constant $\Lambda$ modifies certain properties of large
astrophysical rotating configurations with ellipsoidal geometries, provided the
objects are not too compact. Assuming an equilibrium configuration and so using
the tensor virial equation with $\Lambda$ we explore several equilibrium
properties o... | [
{
"created": "Thu, 22 Jun 2006 09:43:23 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jul 2006 07:19:15 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Balaguera-Antolinez",
"A.",
""
],
[
"Mota",
"D. F.",
""
],
[
"Nowakowski",
"M.",
""
]
] | The cosmological constant $\Lambda$ modifies certain properties of large astrophysical rotating configurations with ellipsoidal geometries, provided the objects are not too compact. Assuming an equilibrium configuration and so using the tensor virial equation with $\Lambda$ we explore several equilibrium properties of ... |
1005.4532 | Orlando Luongo | Orlando Luongo, Hernando Quevedo | Toward an invariant definition of repulsive gravity | to appear in the proceedings of MG12, Marcel Grossman Meeting, Paris,
France, 12-18 Jul 2009 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A remarkable property of naked singularities in general relativity is their
repulsive nature. The effects generated by repulsive gravity are usually
investigated by analyzing the trajectories of test particles which move in the
effective potential of a naked singularity. This method is, however, coordinate
and observ... | [
{
"created": "Tue, 25 May 2010 11:07:30 GMT",
"version": "v1"
}
] | 2010-05-26 | [
[
"Luongo",
"Orlando",
""
],
[
"Quevedo",
"Hernando",
""
]
] | A remarkable property of naked singularities in general relativity is their repulsive nature. The effects generated by repulsive gravity are usually investigated by analyzing the trajectories of test particles which move in the effective potential of a naked singularity. This method is, however, coordinate and observer... |
2403.15318 | Stefan Strub | Stefan H. Strub, Luigi Ferraioli, C\'edric Schmelzbach, Simon C.
St\"ahler, and Domenico Giardini | Global Analysis of LISA Data with Galactic Binaries and Massive Black
Hole Binaries | 13 pages, 11 figures | null | null | null | gr-qc astro-ph.HE astro-ph.IM | http://creativecommons.org/licenses/by/4.0/ | The Laser Interferometer Space Antenna (LISA) is a planned space-based
observatory to measure gravitational waves in the millihertz frequency band.
This frequency band is expected to be dominated by signals from millions of
Galactic binaries and tens of merging massive black hole binaries. The LISA
Data Challenge 2a ... | [
{
"created": "Fri, 22 Mar 2024 16:11:53 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Mar 2024 07:09:35 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Jun 2024 09:28:47 GMT",
"version": "v3"
}
] | 2024-06-04 | [
[
"Strub",
"Stefan H.",
""
],
[
"Ferraioli",
"Luigi",
""
],
[
"Schmelzbach",
"Cédric",
""
],
[
"Stähler",
"Simon C.",
""
],
[
"Giardini",
"Domenico",
""
]
] | The Laser Interferometer Space Antenna (LISA) is a planned space-based observatory to measure gravitational waves in the millihertz frequency band. This frequency band is expected to be dominated by signals from millions of Galactic binaries and tens of merging massive black hole binaries. The LISA Data Challenge 2a is... |
2403.19162 | Lalit Pathak | Lalit Pathak, Amit Reza, Anand S. Sengupta | Fast and faithful interpolation of numerical relativity surrogate
waveforms using meshfree approximation | 14 pages, 9 figures | null | null | LIGO DCC number: LIGO-P2400089 | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several theoretical waveform models have been developed over the years to
capture the gravitational wave emission from the dynamical evolution of compact
binary systems of neutron stars and black holes. As ground-based detectors
improve their sensitivity at low frequencies, the real-time computation of
these waveform... | [
{
"created": "Thu, 28 Mar 2024 06:13:54 GMT",
"version": "v1"
}
] | 2024-03-29 | [
[
"Pathak",
"Lalit",
""
],
[
"Reza",
"Amit",
""
],
[
"Sengupta",
"Anand S.",
""
]
] | Several theoretical waveform models have been developed over the years to capture the gravitational wave emission from the dynamical evolution of compact binary systems of neutron stars and black holes. As ground-based detectors improve their sensitivity at low frequencies, the real-time computation of these waveforms ... |
1111.7192 | Thomas Cailleteau Mr | Thomas Cailleteau, Aurelien Barrau | Gauge invariance in Loop Quantum Cosmology : Hamilton-Jacobi and
Mukhanov-Sasaki equations for scalar perturbations | 16 pages | Phys. Rev. D 85, 123534 (2012) | 10.1103/PhysRevD.85.123534 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gauge invariance of scalar perturbations is studied together with the
associated equations of motion. Extending methods developed in the framework of
hamiltonian General Relativity, the Hamilton-Jacobi equation is investigated
into the details in Loop Quantum Cosmology. The gauge-invariant observables are
built and t... | [
{
"created": "Wed, 30 Nov 2011 14:55:50 GMT",
"version": "v1"
}
] | 2012-11-01 | [
[
"Cailleteau",
"Thomas",
""
],
[
"Barrau",
"Aurelien",
""
]
] | Gauge invariance of scalar perturbations is studied together with the associated equations of motion. Extending methods developed in the framework of hamiltonian General Relativity, the Hamilton-Jacobi equation is investigated into the details in Loop Quantum Cosmology. The gauge-invariant observables are built and the... |
gr-qc/0306094 | Carl E. Dolby | Carl E. Dolby, Mark D. Goodsell and Stephen F. Gull | The Fermionic Particle Density of Flat 1+1 Dimensional Spacetime seen by
an Arbitrarily Moving Observer | 19 pages, 9 figures | Class.Quant.Grav. 20 (2003) 4861-4876 | 10.1088/0264-9381/20/22/010 | null | gr-qc hep-th | null | A coordinate system is constructed for a general accelerating observer in 1+1
dimensions, and is used to determine the particle density of the massless Dirac
vacuum for that observer. Equations are obtained for the spatial distribution
and frequency distribution of massless fermions seen by this observer, in terms
of... | [
{
"created": "Fri, 20 Jun 2003 15:24:44 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Dolby",
"Carl E.",
""
],
[
"Goodsell",
"Mark D.",
""
],
[
"Gull",
"Stephen F.",
""
]
] | A coordinate system is constructed for a general accelerating observer in 1+1 dimensions, and is used to determine the particle density of the massless Dirac vacuum for that observer. Equations are obtained for the spatial distribution and frequency distribution of massless fermions seen by this observer, in terms of t... |
gr-qc/0610086 | Farook Rahaman | F. Rahaman, B.C.Bhui, A Ghosh and R. Mondal | Vacuumless cosmic strings in Einstein Cartan theory | 7 pages, accepted in Fizika B, Reference corrections | FizikaB15:1-8,2006 | null | null | gr-qc | null | The gravitational fields of vacuumless global and gauge strings have been
investigated in the context of Einstein Cartan theory under the weak field
assumption of the field equations. It has been shown that global string and
gauge string can have only repulsive gravitational effect on a test particle.
| [
{
"created": "Tue, 17 Oct 2006 15:44:05 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Oct 2006 10:19:59 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Rahaman",
"F.",
""
],
[
"Bhui",
"B. C.",
""
],
[
"Ghosh",
"A",
""
],
[
"Mondal",
"R.",
""
]
] | The gravitational fields of vacuumless global and gauge strings have been investigated in the context of Einstein Cartan theory under the weak field assumption of the field equations. It has been shown that global string and gauge string can have only repulsive gravitational effect on a test particle. |
2105.13041 | Maurizio Gasperini | G. Fanizza, M. Gasperini, E. Pavone and L. Tedesco | Linearized propagation equations for metric fluctuations in a general
(non-vacuum) background geometry | 17 pages, no figures | JCAP 07 (2021) 021 | 10.1088/1475-7516/2021/07/021 | BA-TH/804-20 | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | The linearized dynamical equation for metric perturbations in a fully
general, non-vacuum, background geometry is obtained from the Hamilton
variational principle applied to the action up to second order. We specialize
our results to the case of traceless and transverse metric fluctuations, and we
discuss how the int... | [
{
"created": "Thu, 27 May 2021 10:19:39 GMT",
"version": "v1"
}
] | 2021-07-14 | [
[
"Fanizza",
"G.",
""
],
[
"Gasperini",
"M.",
""
],
[
"Pavone",
"E.",
""
],
[
"Tedesco",
"L.",
""
]
] | The linearized dynamical equation for metric perturbations in a fully general, non-vacuum, background geometry is obtained from the Hamilton variational principle applied to the action up to second order. We specialize our results to the case of traceless and transverse metric fluctuations, and we discuss how the intri... |
1312.3159 | Alberto Vecchiato | Alberto Vecchiato, Mario Gai, Mario G. Lattanzi, Mariateresa Crosta,
Ugo Becciani and Stefano Bertone | Astrometric tests of General Relativity in the Solar System:
mathematical and computational scenarios | 4 pages, To appear on the proceedings of the International Conference
on Mathematical Modeling in Physical Sciences (IC-MSQUARE) September 1-5,
2013, Prague, Czech Republic | 2014JPhCS.490a2241V | 10.1088/1742-6596/490/1/012241 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the mathematical models available for relativistic astrometry,
discussing the different approaches and their accuracies in the context of the
modern experiments from space like Gaia and GAME, and we show how these models
can be applied to the real world, and their consequences from the mathematical
and nume... | [
{
"created": "Wed, 11 Dec 2013 13:40:19 GMT",
"version": "v1"
}
] | 2014-04-04 | [
[
"Vecchiato",
"Alberto",
""
],
[
"Gai",
"Mario",
""
],
[
"Lattanzi",
"Mario G.",
""
],
[
"Crosta",
"Mariateresa",
""
],
[
"Becciani",
"Ugo",
""
],
[
"Bertone",
"Stefano",
""
]
] | We review the mathematical models available for relativistic astrometry, discussing the different approaches and their accuracies in the context of the modern experiments from space like Gaia and GAME, and we show how these models can be applied to the real world, and their consequences from the mathematical and numeri... |
gr-qc/0306016 | Valerio Bozza | A. Bhadra | Gravitational lensing by a charged black hole of string theory | 6 pages | Phys.Rev. D67 (2003) 103009 | 10.1103/PhysRevD.67.103009 | null | gr-qc astro-ph hep-th | null | We study gravitational lensing by the
Gibbons-Maeda-Garfinkle-Horowitz-Strominger (GMGHS) charged black hole of
heterotic string theory and obtain the angular position and magnification of
the relativistic images. Modeling the supermassive central object of the galaxy
as a GMGHS black hole, we estimate the numerical ... | [
{
"created": "Wed, 4 Jun 2003 13:50:23 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Bhadra",
"A.",
""
]
] | We study gravitational lensing by the Gibbons-Maeda-Garfinkle-Horowitz-Strominger (GMGHS) charged black hole of heterotic string theory and obtain the angular position and magnification of the relativistic images. Modeling the supermassive central object of the galaxy as a GMGHS black hole, we estimate the numerical va... |
gr-qc/0206027 | Vladimir Karas | M. Abramowicz, I. Bengtsson, V. Karas, K. Rosquist | Poincare ball embeddings of the optical geometry | 16 pages, 8 figures; CQG accepted | Class.Quant.Grav. 19 (2002) 3963-3976 | 10.1088/0264-9381/19/15/307 | null | gr-qc astro-ph | null | It is shown that optical geometry of the Reissner-Nordstrom exterior metric
can be embedded in a hyperbolic space all the way down to its outer horizon.
The adopted embedding procedure removes a breakdown of flat-space embeddings
which occurs outside the horizon, at and below the Buchdahl-Bondi limit
(R/M=9/4 in the ... | [
{
"created": "Mon, 10 Jun 2002 08:16:06 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Abramowicz",
"M.",
""
],
[
"Bengtsson",
"I.",
""
],
[
"Karas",
"V.",
""
],
[
"Rosquist",
"K.",
""
]
] | It is shown that optical geometry of the Reissner-Nordstrom exterior metric can be embedded in a hyperbolic space all the way down to its outer horizon. The adopted embedding procedure removes a breakdown of flat-space embeddings which occurs outside the horizon, at and below the Buchdahl-Bondi limit (R/M=9/4 in the Sc... |
2202.01835 | H{\aa}kan Andr\'easson | H{\aa}kan Andr\'easson, Markus Kunze | Static solutions to the spherically symmetric Einstein-Vlasov system: a
particle-number-Casimir approach | 41 pages | SIAM J. Math. Anal. 55, 4843-4879 (2023) | 10.1137/22M1522887 | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | Existence of spherically symmetric solutions to the Einstein-Vlasov system is
well-known. However, it is an open problem whether or not static solutions
arise as minimizers of a variational problem. Apart from being of interest in
its own right, it is the connection to non-linear stability that gives this
topic its i... | [
{
"created": "Thu, 3 Feb 2022 20:29:48 GMT",
"version": "v1"
}
] | 2024-02-19 | [
[
"Andréasson",
"Håkan",
""
],
[
"Kunze",
"Markus",
""
]
] | Existence of spherically symmetric solutions to the Einstein-Vlasov system is well-known. However, it is an open problem whether or not static solutions arise as minimizers of a variational problem. Apart from being of interest in its own right, it is the connection to non-linear stability that gives this topic its imp... |
gr-qc/9702004 | Raul Abramo | L.R. Abramo, R.H. Brandenberger, V.M. Mukhanov | Back Reaction of Gravitational Perturbations | 3 pages, LaTex using sprocl.sty, to appear in: Proceedings of the
18th Texas Symposium on Relativistic Astrophysics (eds Olinto, Frieman and
Schramm, World Scientific) | null | null | null | gr-qc astro-ph | null | The back reaction of gravitational perturbations in a homogeneous background
is determined by an effective energy-momentum tensor quadratic in the
perturbations. We show that this nonlinear feedback effect is important in the
case of long wavelength scalar perturbations in inflationary universe models.
We also show h... | [
{
"created": "Sat, 1 Feb 1997 21:37:18 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Abramo",
"L. R.",
""
],
[
"Brandenberger",
"R. H.",
""
],
[
"Mukhanov",
"V. M.",
""
]
] | The back reaction of gravitational perturbations in a homogeneous background is determined by an effective energy-momentum tensor quadratic in the perturbations. We show that this nonlinear feedback effect is important in the case of long wavelength scalar perturbations in inflationary universe models. We also show how... |
1412.8660 | Ilia Musco | John C. Miller and Ilia Musco | Causal horizons and topics in structure formation | 12 pages, 2 figures, To appear in Proceedings of the RAGtime meetings
2008-2014, Opava, Czech Republic; S. Hledik and Z. Stuchlik, editors | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is a write-up of a talk given at the Opava RAGtime meeting in 2011, but
it has been updated to include some subsequent related developments. The talk
focused on discussion of some aspects of black hole and cosmological horizons
under rather general circumstances, and on two different topics related to
formation ... | [
{
"created": "Tue, 30 Dec 2014 15:37:06 GMT",
"version": "v1"
}
] | 2014-12-31 | [
[
"Miller",
"John C.",
""
],
[
"Musco",
"Ilia",
""
]
] | This is a write-up of a talk given at the Opava RAGtime meeting in 2011, but it has been updated to include some subsequent related developments. The talk focused on discussion of some aspects of black hole and cosmological horizons under rather general circumstances, and on two different topics related to formation of... |
gr-qc/9709056 | David Scialom | Philippe Jetzer and David Scialom | On the Stability of Real Scalar Boson Stars | 3 pages, latex, no figures | null | null | null | gr-qc | null | We discuss spherically symmetric static solutions of the
Einstein-Klein-Gordon equations for a real scalar field with a mass and a
quartic self-interaction term. As for the massless case the solutions have a
naked singularity at the origin. However, linear stability analysis shows that
these solutions as well as the ... | [
{
"created": "Mon, 22 Sep 1997 15:50:07 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Jetzer",
"Philippe",
""
],
[
"Scialom",
"David",
""
]
] | We discuss spherically symmetric static solutions of the Einstein-Klein-Gordon equations for a real scalar field with a mass and a quartic self-interaction term. As for the massless case the solutions have a naked singularity at the origin. However, linear stability analysis shows that these solutions as well as the ma... |
1706.07421 | N\'estor Ortiz | Juan Cayuso, N\'estor Ortiz, and Luis Lehner | Fixing extensions to General Relativity in the non-linear regime | 26 pages, 10 figures. Matches published version | Phys. Rev. D 96, 084043 (2017) | 10.1103/PhysRevD.96.084043 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The question of what gravitational theory could supersede General Relativity
has been central in theoretical physics for decades. Many disparate
alternatives have been proposed motivated by cosmology, quantum gravity and
phenomenological angles, and have been subjected to tests derived from
cosmological, solar system... | [
{
"created": "Thu, 22 Jun 2017 17:53:09 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jun 2017 21:34:54 GMT",
"version": "v2"
},
{
"created": "Fri, 10 Nov 2017 00:49:58 GMT",
"version": "v3"
}
] | 2017-11-13 | [
[
"Cayuso",
"Juan",
""
],
[
"Ortiz",
"Néstor",
""
],
[
"Lehner",
"Luis",
""
]
] | The question of what gravitational theory could supersede General Relativity has been central in theoretical physics for decades. Many disparate alternatives have been proposed motivated by cosmology, quantum gravity and phenomenological angles, and have been subjected to tests derived from cosmological, solar system a... |
1704.04444 | Kostiantyn Ropotenko | Kostiantyn Ropotenko | Fast scrambling as Brownian motion in a fluid with negative viscosity | 7 pages, Essay written for the Gravity Research Foundation 2017
Awards for Essays on Gravitation | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that the fast scrambling of information in a black hole can be
viewed as Brownian motion of information in a fluid with negative viscosity
(and negative temperature). It is argued that a non-local character of the fast
scrambling is only an illusion; the stretched horizon with negative viscosity
is an amp... | [
{
"created": "Thu, 13 Apr 2017 16:18:41 GMT",
"version": "v1"
}
] | 2017-04-17 | [
[
"Ropotenko",
"Kostiantyn",
""
]
] | It is shown that the fast scrambling of information in a black hole can be viewed as Brownian motion of information in a fluid with negative viscosity (and negative temperature). It is argued that a non-local character of the fast scrambling is only an illusion; the stretched horizon with negative viscosity is an ampli... |
1802.06062 | Jos\'e Francisco da Rocha-Neto J. F. | J. F. da Rocha-Neto, B. R. Morais | Gravitational Pressure, apparent horizon and thermodynamics of FLRW
universe in the teleparallel gravity | 20 pages, no figures | General Relativity and Gravitation 2018 | 10.1007/s10714-018-2350-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of the teleparallel equivalent of general relativity the
concept of gravitational pressure and gravitational energy-momentum arisen in a
natural way. In the case of a Friedmann-Lemaitre-Robertson-Walker space FLRW we
obtain the total energy contained inside the apparent horizon and the radial
pressure ... | [
{
"created": "Fri, 16 Feb 2018 18:27:37 GMT",
"version": "v1"
}
] | 2018-02-19 | [
[
"da Rocha-Neto",
"J. F.",
""
],
[
"Morais",
"B. R.",
""
]
] | In the context of the teleparallel equivalent of general relativity the concept of gravitational pressure and gravitational energy-momentum arisen in a natural way. In the case of a Friedmann-Lemaitre-Robertson-Walker space FLRW we obtain the total energy contained inside the apparent horizon and the radial pressure ov... |
2308.05132 | Rabia Saleem | Xin-Yun Hu, M. Israr Aslam, Rabia Saleem and Xiao-Xiong Zeng | Holographic Einstein Rings of an AdS Black Hole in Massive Gravity | 15 pages, 14 figures | null | null | null | gr-qc hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | In the context of holography, the Einstein ring of an AdS black hole (BH) in
massive gravity (MG) is depicted. An oscillating Gaussian source on one side of
the AdS boundary propagates in bulk, and we impose a response function to
explain it. Using a wave optics imaging system, we obtain the optical
appearance of the... | [
{
"created": "Wed, 9 Aug 2023 13:00:56 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Aug 2023 12:11:24 GMT",
"version": "v2"
}
] | 2023-08-22 | [
[
"Hu",
"Xin-Yun",
""
],
[
"Aslam",
"M. Israr",
""
],
[
"Saleem",
"Rabia",
""
],
[
"Zeng",
"Xiao-Xiong",
""
]
] | In the context of holography, the Einstein ring of an AdS black hole (BH) in massive gravity (MG) is depicted. An oscillating Gaussian source on one side of the AdS boundary propagates in bulk, and we impose a response function to explain it. Using a wave optics imaging system, we obtain the optical appearance of the E... |
2007.03769 | Sam Patrick | Sam Patrick, Silke Weinfurtner | Superradiance in dispersive black hole analogues | 22 pages, 11 figures | Phys. Rev. D 102, 084041 (2020) | 10.1103/PhysRevD.102.084041 | null | gr-qc physics.flu-dyn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Wave equations containing spatial derivatives which are higher than second
order arise naturally in the context of condensed matter systems. The solutions
of such equations contain more than two modes and consequently, the range of
possible interactions between the different modes is significantly enhanced
compared t... | [
{
"created": "Tue, 7 Jul 2020 20:05:36 GMT",
"version": "v1"
}
] | 2020-10-28 | [
[
"Patrick",
"Sam",
""
],
[
"Weinfurtner",
"Silke",
""
]
] | Wave equations containing spatial derivatives which are higher than second order arise naturally in the context of condensed matter systems. The solutions of such equations contain more than two modes and consequently, the range of possible interactions between the different modes is significantly enhanced compared to ... |
0911.1589 | Jeandrew Brink | Jeandrew Brink | Spacetime Encodings III - Second Order Killing Tensors | 9 pages | Phys.Rev.D81:022001,2010 | 10.1103/PhysRevD.81.022001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper explores the Petrov type D, stationary axisymmetric vacuum (SAV)
spacetimes that were found by Carter to have separable Hamilton-Jacobi
equations, and thus admit a second-order Killing tensor. The derivation of the
spacetimes presented in this paper borrows from ideas about dynamical systems,
and illustrat... | [
{
"created": "Mon, 9 Nov 2009 05:42:17 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Brink",
"Jeandrew",
""
]
] | This paper explores the Petrov type D, stationary axisymmetric vacuum (SAV) spacetimes that were found by Carter to have separable Hamilton-Jacobi equations, and thus admit a second-order Killing tensor. The derivation of the spacetimes presented in this paper borrows from ideas about dynamical systems, and illustrates... |
1509.00590 | Sergey Yu. Vernov | A.Yu. Kamenshchik, E.O. Pozdeeva, A. Tronconi, G. Venturi, S.Yu.
Vernov | Interdependence between integrable cosmological models with minimal and
non-minimal coupling | 15 pages, v2: figures and references added, accepted for publication
in CQG | Class. Quantum Grav. 33 (2016) 015004 | 10.1088/0264-9381/33/1/015004 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the relation between exact solutions of cosmological models
having minimally and non-minimally coupled scalar fields. This is done for a
particular class of solvable models which, in the Einstein frame, have
potentials depending on hyperbolic functions and in the Jordan frame, where the
non-minimal coupli... | [
{
"created": "Wed, 2 Sep 2015 07:41:55 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Nov 2015 18:53:45 GMT",
"version": "v2"
}
] | 2015-12-15 | [
[
"Kamenshchik",
"A. Yu.",
""
],
[
"Pozdeeva",
"E. O.",
""
],
[
"Tronconi",
"A.",
""
],
[
"Venturi",
"G.",
""
],
[
"Vernov",
"S. Yu.",
""
]
] | We consider the relation between exact solutions of cosmological models having minimally and non-minimally coupled scalar fields. This is done for a particular class of solvable models which, in the Einstein frame, have potentials depending on hyperbolic functions and in the Jordan frame, where the non-minimal coupling... |
gr-qc/0204040 | Varun Sahni | Yuri Shtanov and Varun Sahni | New Cosmological Singularities in Braneworld Models | 11 pages, 3 figures. Slight change in title to match version accepted
for publication in Class. Quant. Grav. (Lett.) | Class.Quant.Grav.19:L101-L107,2002 | 10.1088/0264-9381/19/11/102 | null | gr-qc astro-ph hep-ph hep-th | null | Higher-dimensional braneworld models which contain both bulk and brane
curvature terms in the action admit cosmological singularities of rather
unusual form and nature. These `quiescent' singularities, which can occur both
during the contracting as well as the expanding phase, are characterised by the
fact that while... | [
{
"created": "Thu, 11 Apr 2002 07:29:02 GMT",
"version": "v1"
},
{
"created": "Thu, 2 May 2002 17:43:32 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Shtanov",
"Yuri",
""
],
[
"Sahni",
"Varun",
""
]
] | Higher-dimensional braneworld models which contain both bulk and brane curvature terms in the action admit cosmological singularities of rather unusual form and nature. These `quiescent' singularities, which can occur both during the contracting as well as the expanding phase, are characterised by the fact that while t... |
0909.2717 | Masoud Alimohammadi | M. Alimohammadi and H. Behnamian | Remarks on generalized scalar-tensor models of dark energy | 20 pages, 5 figures, typos corrected, reference added | Phys.Rev.D80:063008,2009 | 10.1103/PhysRevD.80.063008 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The generalized scalar-tensor models with Lagrangian
$F(\phi,R)-U(\phi)(\nabla\phi)^2$ are considered. It is shown that the
phantom-divide-line crossing and the deceleration to acceleration transition
generally occurr in these models. Two specific examples, the coupled
quintessence model and the Brans-Dicke model are... | [
{
"created": "Tue, 15 Sep 2009 06:06:37 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Sep 2009 10:21:33 GMT",
"version": "v2"
}
] | 2010-04-30 | [
[
"Alimohammadi",
"M.",
""
],
[
"Behnamian",
"H.",
""
]
] | The generalized scalar-tensor models with Lagrangian $F(\phi,R)-U(\phi)(\nabla\phi)^2$ are considered. It is shown that the phantom-divide-line crossing and the deceleration to acceleration transition generally occurr in these models. Two specific examples, the coupled quintessence model and the Brans-Dicke model are c... |
gr-qc/9207011 | Sai Iyer | Sai Iyer and A R Prasanna | Centrifugal force in Kerr geometry | 6 pages, LateX macros | null | 10.1088/0264-9381/10/1/003 | PRL-TH-92/33 | gr-qc | null | We have obtained the correct expression for the centrifugal force acting on a
particle at the equatorial circumference of a rotating body in the locally
non-rotating frame of the Kerr geometry. Using this expression for the
equilibrium of an element on the surface of a slowly rotating Maclaurin
spheroid, we obtain th... | [
{
"created": "Fri, 31 Jul 1992 16:09:17 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Iyer",
"Sai",
""
],
[
"Prasanna",
"A R",
""
]
] | We have obtained the correct expression for the centrifugal force acting on a particle at the equatorial circumference of a rotating body in the locally non-rotating frame of the Kerr geometry. Using this expression for the equilibrium of an element on the surface of a slowly rotating Maclaurin spheroid, we obtain the ... |
1706.01879 | Lorenzo Sebastiani | E. Elizalde, S.D. Odintsov, L.Sebastiani, R.Myrzakulov | Beyond-one-loop quantum gravity action yielding both inflation and
late-time acceleration | 20 pages, to appear in NPB | null | 10.1016/j.nuclphysb.2017.06.003 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A unified description of early-time inflation with the current cosmic
acceleration is achieved by means of a new theory that uses a quadratic model
of gravity, with the inclusion of an exponential $F(R)$-gravity contribution
for dark energy. High-curvature corrections of the theory come from
higher-derivative quantum... | [
{
"created": "Tue, 6 Jun 2017 12:55:27 GMT",
"version": "v1"
}
] | 2017-06-28 | [
[
"Elizalde",
"E.",
""
],
[
"Odintsov",
"S. D.",
""
],
[
"Sebastiani",
"L.",
""
],
[
"Myrzakulov",
"R.",
""
]
] | A unified description of early-time inflation with the current cosmic acceleration is achieved by means of a new theory that uses a quadratic model of gravity, with the inclusion of an exponential $F(R)$-gravity contribution for dark energy. High-curvature corrections of the theory come from higher-derivative quantum g... |
2309.05643 | Christian J. Kr\"uger | Christian J. Kr\"uger, Sebastian H. V\"olkel | Rapidly rotating neutron stars: Universal relations and EOS inference | 17 pages, 14 figures | Phys. Rev. D108, 124056 (2023) | 10.1103/PhysRevD.108.124056 | null | gr-qc astro-ph.HE astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide accurate universal relations that allow to estimate the moment of
inertia $I$ and the ratio of kinetic to gravitational binding energy $T/W$ of
uniformly rotating neutron stars from the knowledge of mass, radius, and moment
of inertia of an associated non-rotating neutron star. Based on these, several
othe... | [
{
"created": "Mon, 11 Sep 2023 17:33:38 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Jan 2024 22:33:48 GMT",
"version": "v2"
}
] | 2024-01-17 | [
[
"Krüger",
"Christian J.",
""
],
[
"Völkel",
"Sebastian H.",
""
]
] | We provide accurate universal relations that allow to estimate the moment of inertia $I$ and the ratio of kinetic to gravitational binding energy $T/W$ of uniformly rotating neutron stars from the knowledge of mass, radius, and moment of inertia of an associated non-rotating neutron star. Based on these, several other ... |
0903.4724 | Xin-Zhou Li | Xin-zhou Li, Chang-bo Sun and Ping Xi | Statefinder diagnostic in a torsion cosmology | 18 pages, 15 figures, accepted paper in JCAP | JCAP 0904:015,2009 | 10.1088/1475-7516/2009/04/015 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply the statefinder diagnostic to the torsion cosmology, in which an
accounting for the accelerated universe is considered in term of a
Riemann-Cartan geometry: dynamic scalar torsion. We find that there are some
typical characteristic of the evolution of statefinder parameters for the
torsion cosmology that can... | [
{
"created": "Fri, 27 Mar 2009 01:46:14 GMT",
"version": "v1"
}
] | 2011-03-31 | [
[
"Li",
"Xin-zhou",
""
],
[
"Sun",
"Chang-bo",
""
],
[
"Xi",
"Ping",
""
]
] | We apply the statefinder diagnostic to the torsion cosmology, in which an accounting for the accelerated universe is considered in term of a Riemann-Cartan geometry: dynamic scalar torsion. We find that there are some typical characteristic of the evolution of statefinder parameters for the torsion cosmology that can b... |
0803.3849 | Myungseok Yoon | Wontae Kim, Hyeonjoon Shin, and Myungseok Yoon | Anomaly and Hawking radiation from regular black holes | 14 pages, 4 figures | J.Korean Phys.Soc. 53 (2008) 1791-1796 | 10.3938/jkps.53.1791 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the Hawking radiation from two regular black holes, the minimal
model and the noncommutative black hole. The flux of Hawking radiation is
derived by applying the anomaly cancellation method proposed by Robinson and
Wilczek. Two regular black holes have the same radiation pattern except for the
detailed ex... | [
{
"created": "Thu, 27 Mar 2008 00:53:54 GMT",
"version": "v1"
}
] | 2018-02-14 | [
[
"Kim",
"Wontae",
""
],
[
"Shin",
"Hyeonjoon",
""
],
[
"Yoon",
"Myungseok",
""
]
] | We consider the Hawking radiation from two regular black holes, the minimal model and the noncommutative black hole. The flux of Hawking radiation is derived by applying the anomaly cancellation method proposed by Robinson and Wilczek. Two regular black holes have the same radiation pattern except for the detailed expr... |
1312.4529 | William East | William E. East, Fethi M. Ramazano\u{g}lu, and Frans Pretorius | Black Hole Superradiance in Dynamical Spacetime | 5 pages, 4 figures; revised to match PRD version | Phys. Rev. D 89, 061503 (2014) | 10.1103/PhysRevD.89.061503 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the superradiant scattering of gravitational waves by a nearly
extremal black hole (dimensionless spin $a=0.99$) by numerically solving the
full Einstein field equations, thus including backreaction effects. This allows
us to study the dynamics of the black hole as it loses energy and angular
momentum during... | [
{
"created": "Mon, 16 Dec 2013 21:00:00 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Mar 2014 21:50:16 GMT",
"version": "v2"
}
] | 2014-03-26 | [
[
"East",
"William E.",
""
],
[
"Ramazanoğlu",
"Fethi M.",
""
],
[
"Pretorius",
"Frans",
""
]
] | We study the superradiant scattering of gravitational waves by a nearly extremal black hole (dimensionless spin $a=0.99$) by numerically solving the full Einstein field equations, thus including backreaction effects. This allows us to study the dynamics of the black hole as it loses energy and angular momentum during t... |
gr-qc/9611048 | Marco `BRONI` Bruni | M. Bruni, S. Matarrese, S. Mollerach, and S. Sonego | On Relativistic Perturbations of Second and Higher Order | 6 pages, latex, with special style included, Proceedings of the 12th
Italian Conference on General Relativity and Gravitational Physics | null | null | IC/96/224, SISSA--162/96/A | gr-qc astro-ph | null | We present the results of a study of the gauge dependence of spacetime
perturbations. In particular, we consider gauge invariance in general, we give
a generating formula for gauge transformations to an arbitrary order n, and
explicit transformation rules at second order.
| [
{
"created": "Wed, 20 Nov 1996 11:26:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bruni",
"M.",
""
],
[
"Matarrese",
"S.",
""
],
[
"Mollerach",
"S.",
""
],
[
"Sonego",
"S.",
""
]
] | We present the results of a study of the gauge dependence of spacetime perturbations. In particular, we consider gauge invariance in general, we give a generating formula for gauge transformations to an arbitrary order n, and explicit transformation rules at second order. |
0708.0490 | Luca Lusanna | Luca Lusanna (INFN, Firenze) | The Chrono-Geometrical Structure of General Relativity and Clock
Synchronization | 13 pages, Talk at the First Colloquium Scientific and Fundamental
Aspects of the Galileo Programme, Toulouse 1-4 October 2007 | null | null | null | gr-qc | null | After a review of the chrono-geometrical structure of special relativity,
where the definition of the instantaneous 3-space is based on the
observer-dependent convention for the synchronization of distant clocks, it is
shown that in a class of models of general relativity the instantaneous 3-space
and the associated ... | [
{
"created": "Fri, 3 Aug 2007 10:50:48 GMT",
"version": "v1"
}
] | 2007-08-06 | [
[
"Lusanna",
"Luca",
"",
"INFN, Firenze"
]
] | After a review of the chrono-geometrical structure of special relativity, where the definition of the instantaneous 3-space is based on the observer-dependent convention for the synchronization of distant clocks, it is shown that in a class of models of general relativity the instantaneous 3-space and the associated cl... |
gr-qc/0411031 | Thomas Thiemann | Thomas Thiemann | Reduced Phase Space Quantization and Dirac Observables | 18 pages, no figures | Class.Quant.Grav. 23 (2006) 1163-1180 | 10.1088/0264-9381/23/4/006 | AEI-2004-103 | gr-qc | null | In her recent work, Dittrich generalized Rovelli's idea of partial
observables to construct Dirac observables for constrained systems to the
general case of an arbitrary first class constraint algebra with structure
functions rather than structure constants. Here we use this framework and
propose a new way for how to... | [
{
"created": "Sat, 6 Nov 2004 19:08:06 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Thiemann",
"Thomas",
""
]
] | In her recent work, Dittrich generalized Rovelli's idea of partial observables to construct Dirac observables for constrained systems to the general case of an arbitrary first class constraint algebra with structure functions rather than structure constants. Here we use this framework and propose a new way for how to i... |
gr-qc/0504005 | Christian Heinicke | Christian Heinicke, Peter Baekler, Friedrich W. Hehl | Einstein-aether theory, violation of Lorentz invariance, and
metric-affine gravity | Revtex4, 38 pages, 1 figure | Phys.Rev.D72:025012,2005 | 10.1103/PhysRevD.72.025012 | null | gr-qc hep-th | null | We show that the Einstein-aether theory of Jacobson and Mattingly (J&M) can
be understood in the framework of the metric-affine (gauge theory of) gravity
(MAG). We achieve this by relating the aether vector field of J&M to certain
post-Riemannian nonmetricity pieces contained in an independent linear
connection of sp... | [
{
"created": "Fri, 1 Apr 2005 16:58:14 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Heinicke",
"Christian",
""
],
[
"Baekler",
"Peter",
""
],
[
"Hehl",
"Friedrich W.",
""
]
] | We show that the Einstein-aether theory of Jacobson and Mattingly (J&M) can be understood in the framework of the metric-affine (gauge theory of) gravity (MAG). We achieve this by relating the aether vector field of J&M to certain post-Riemannian nonmetricity pieces contained in an independent linear connection of spac... |
1909.01129 | Michael Good | Michael R. R. Good, Eric V. Linder, Frank Wilczek | Remnant-free Moving Mirror Model for Black Hole Radiation Field | 5 pages, 5 figures | Phys. Rev. D 101, 025012 (2020) | 10.1103/PhysRevD.101.025012 | MIT-CTP/5144 | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the flow of energy and entropy emitted by a class of moving mirror
trajectories which provide models for the radiation fields produced by black
hole evaporation. The mirror radiation fields provide natural, concrete
examples of processes that follow thermal distributions for long periods,
accompanied by tr... | [
{
"created": "Fri, 30 Aug 2019 04:00:54 GMT",
"version": "v1"
}
] | 2020-02-04 | [
[
"Good",
"Michael R. R.",
""
],
[
"Linder",
"Eric V.",
""
],
[
"Wilczek",
"Frank",
""
]
] | We analyze the flow of energy and entropy emitted by a class of moving mirror trajectories which provide models for the radiation fields produced by black hole evaporation. The mirror radiation fields provide natural, concrete examples of processes that follow thermal distributions for long periods, accompanied by tran... |
1105.0667 | Jorge Pullin | Rodolfo Gambini, Jorge Pullin, Saeed Rastgoo | Quantum scalar field in quantum gravity: the propagator and Lorentz
invariance in the spherically symmetric case | Dedicated to Josh Goldberg, to appear in special issue of Gen. Rel.
Grav., 14 pages RevTex. We expanded the section on Lorentz invariance | Gen. Rel. Grav. 43 3569-3592 (2011) | 10.1007/s10714-011-1252-0 | LSU-REL-050311 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We recently studied gravity coupled to a scalar field in spherical symmetry
using loop quantum gravity techniques. Since there are local degrees of freedom
one faces the "problem of dynamics". We attack it using the "uniform
discretization technique". We find the quantum state that minimizes the value
of the master c... | [
{
"created": "Tue, 3 May 2011 19:55:48 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Jul 2011 18:26:36 GMT",
"version": "v2"
}
] | 2012-02-13 | [
[
"Gambini",
"Rodolfo",
""
],
[
"Pullin",
"Jorge",
""
],
[
"Rastgoo",
"Saeed",
""
]
] | We recently studied gravity coupled to a scalar field in spherical symmetry using loop quantum gravity techniques. Since there are local degrees of freedom one faces the "problem of dynamics". We attack it using the "uniform discretization technique". We find the quantum state that minimizes the value of the master con... |
2109.10336 | Quentin Vigneron | Quentin Vigneron | Is backreaction in cosmology a relativistic effect? On the need for an
extension of Newton's theory to non-Euclidean topologies | Accepted for publication in Physical Review D | null | 10.1103/PhysRevD.105.043524 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Cosmological backreaction corresponds to the effect of inhomogeneities of
structure on the global expansion of the Universe. The main question
surrounding this phenomenon is whether or not it is important enough to lead to
measurable effects on the scale factor evolution eventually explaining its
acceleration or the ... | [
{
"created": "Tue, 21 Sep 2021 17:44:05 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jan 2022 14:25:10 GMT",
"version": "v2"
}
] | 2022-03-02 | [
[
"Vigneron",
"Quentin",
""
]
] | Cosmological backreaction corresponds to the effect of inhomogeneities of structure on the global expansion of the Universe. The main question surrounding this phenomenon is whether or not it is important enough to lead to measurable effects on the scale factor evolution eventually explaining its acceleration or the Hu... |
2106.01297 | Fay Dowker | Fay Dowker and Jeremy Butterfield | Recovering General Relativity from a Planck scale discrete theory of
quantum gravity | 47 pages, 2 figures | null | null | null | gr-qc hep-th physics.hist-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An argument is presented that if a theory of quantum gravity is physically
discrete at the Planck scale and the theory recovers General Relativity as an
approximation, then, at the current stage of our knowledge, causal sets must
arise within the theory, even if they are not its basis.
We show in particular that an... | [
{
"created": "Wed, 2 Jun 2021 17:06:34 GMT",
"version": "v1"
}
] | 2021-06-03 | [
[
"Dowker",
"Fay",
""
],
[
"Butterfield",
"Jeremy",
""
]
] | An argument is presented that if a theory of quantum gravity is physically discrete at the Planck scale and the theory recovers General Relativity as an approximation, then, at the current stage of our knowledge, causal sets must arise within the theory, even if they are not its basis. We show in particular that an app... |
1409.7977 | Benjamin Schulz | Benjamin Schulz | Review on the quantization of gravity | 100 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is a review article on quantum gravity. In section 1, the Penrose
singularity theorem is proven. In section 2, the covariant quantization
approach of gravity is reviewed. In section 3, an article by Hawking is
reviewed that shows the gravitational path integral at one loop level to be
dominated by contributions ... | [
{
"created": "Mon, 29 Sep 2014 01:24:05 GMT",
"version": "v1"
}
] | 2014-09-30 | [
[
"Schulz",
"Benjamin",
""
]
] | This is a review article on quantum gravity. In section 1, the Penrose singularity theorem is proven. In section 2, the covariant quantization approach of gravity is reviewed. In section 3, an article by Hawking is reviewed that shows the gravitational path integral at one loop level to be dominated by contributions fr... |
gr-qc/0510016 | Harald P. Pfeiffer | Harald P. Pfeiffer | Initial data for black hole evolutions | Ph.D. thesis, Cornell University, 2003 | null | null | null | gr-qc | null | We discuss the initial value problem of general relativity in its recently
unified Lagrangian and Hamiltonian pictures and present a multi-domain
pseudo-spectral collocation method to solve the resulting coupled nonlinear
partial differential equations. Using this code, we explore several approaches
to construct init... | [
{
"created": "Tue, 4 Oct 2005 18:40:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pfeiffer",
"Harald P.",
""
]
] | We discuss the initial value problem of general relativity in its recently unified Lagrangian and Hamiltonian pictures and present a multi-domain pseudo-spectral collocation method to solve the resulting coupled nonlinear partial differential equations. Using this code, we explore several approaches to construct initia... |
1506.01664 | Alexandre Filippov | Alexandre T. Filippov | On solving dynamical equations in general homogeneous isotropic
cosmologies with scalaron | New version: 33 pages instead 32; revised and extended Abstract,
Sections 4.3, 5; edited Section 1, changed a few titles; corrected misprints | null | 10.1134/S0040577916070072 | null | gr-qc astro-ph.CO hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study general dynamical equations describing homogeneous isotropic
cosmologies coupled to a scalaron $\psi$. For flat cosmologies ($k=0$), we
analyze in detail the gauge-independent equation describing the differential,
$\chi(\alpha)\equiv\psi^\prime(\alpha)$, of the map of the metric $\alpha$ to
the scalaron fiel... | [
{
"created": "Thu, 4 Jun 2015 17:35:53 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Sep 2015 16:11:27 GMT",
"version": "v2"
},
{
"created": "Tue, 20 Oct 2015 18:14:36 GMT",
"version": "v3"
}
] | 2016-08-24 | [
[
"Filippov",
"Alexandre T.",
""
]
] | We study general dynamical equations describing homogeneous isotropic cosmologies coupled to a scalaron $\psi$. For flat cosmologies ($k=0$), we analyze in detail the gauge-independent equation describing the differential, $\chi(\alpha)\equiv\psi^\prime(\alpha)$, of the map of the metric $\alpha$ to the scalaron field ... |
0906.2655 | Stefan Hild | Stefan Hild, Simon Chelkowski, Andreas Freise, Janyce Franc, Nazario
Morgado, Raffaele Flaminio and Riccardo DeSalvo | A Xylophone Configuration for a third Generation Gravitational Wave
Detector | null | Class.Quant.Grav.27:015003,2010 | 10.1088/0264-9381/27/1/015003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Achieving the demanding sensitivity and bandwidth, envisaged for third
generation gravitational wave (GW) observatories, is extremely challenging with
a single broadband interferometer. Very high optical powers (Megawatts) are
required to reduce the quantum noise contribution at high frequencies, while
the interferom... | [
{
"created": "Mon, 15 Jun 2009 10:45:33 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Jul 2009 15:09:43 GMT",
"version": "v2"
}
] | 2010-01-06 | [
[
"Hild",
"Stefan",
""
],
[
"Chelkowski",
"Simon",
""
],
[
"Freise",
"Andreas",
""
],
[
"Franc",
"Janyce",
""
],
[
"Morgado",
"Nazario",
""
],
[
"Flaminio",
"Raffaele",
""
],
[
"DeSalvo",
"Riccardo",
""
]
] | Achieving the demanding sensitivity and bandwidth, envisaged for third generation gravitational wave (GW) observatories, is extremely challenging with a single broadband interferometer. Very high optical powers (Megawatts) are required to reduce the quantum noise contribution at high frequencies, while the interferomet... |
0711.1284 | Carlo Rovelli | Emanuele Alesci, Carlo Rovelli | The complete LQG propagator: II. Asymptotic behavior of the vertex | 16 pages | Phys.Rev.D77:044024,2008 | 10.1103/PhysRevD.77.044024 | null | gr-qc | null | In a previous article we have show that there are difficulties in obtaining
the correct graviton propagator from the loop-quantum-gravity dynamics defined
by the Barrett-Crane vertex amplitude. Here we show that a vertex amplitude
that depends nontrivially on the intertwiners can yield the correct propagator.
We give... | [
{
"created": "Thu, 8 Nov 2007 14:45:43 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Alesci",
"Emanuele",
""
],
[
"Rovelli",
"Carlo",
""
]
] | In a previous article we have show that there are difficulties in obtaining the correct graviton propagator from the loop-quantum-gravity dynamics defined by the Barrett-Crane vertex amplitude. Here we show that a vertex amplitude that depends nontrivially on the intertwiners can yield the correct propagator. We give a... |
gr-qc/0509068 | Stephane Fay | Stephane Fay | Properties of homogeneous cosmologies in scalar tensor theories | 40 pages, 6 figures, chapter of book | Frontiers in field theory, Nova publishers, 2005 | null | null | gr-qc | null | We study the isotropisation of the homogeneous but anisotropic Bianchi class
A models in presence of a minimally coupled and massive scalar field with or
without a perfect fluid. To this end, we use the Hamiltonian formalism of
Arnowitt, Deser and Misner(ADM) and the dynamical systems analysis methods. Our
results al... | [
{
"created": "Fri, 16 Sep 2005 15:15:19 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Fay",
"Stephane",
""
]
] | We study the isotropisation of the homogeneous but anisotropic Bianchi class A models in presence of a minimally coupled and massive scalar field with or without a perfect fluid. To this end, we use the Hamiltonian formalism of Arnowitt, Deser and Misner(ADM) and the dynamical systems analysis methods. Our results allo... |
1005.1097 | John D. Swain | John Swain | Black Holes and the Strong CP Problem | Small corrections/additions made plus added references and discussion
of theta terms for electromagnetism and gravity in topologically more
complicated spacetimes | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The strong CP problem is that SU(3) gauge field instantons naturally induce a
CP violating term in the QCD Lagrangian which is constrained by experiment to
be very small for no obvious reason. We show that this problem disappears if
one assumes the existence of at least one black hole somewhere in the universe.
The a... | [
{
"created": "Thu, 6 May 2010 22:35:11 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Jun 2010 01:00:47 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Swain",
"John",
""
]
] | The strong CP problem is that SU(3) gauge field instantons naturally induce a CP violating term in the QCD Lagrangian which is constrained by experiment to be very small for no obvious reason. We show that this problem disappears if one assumes the existence of at least one black hole somewhere in the universe. The arg... |
2011.13198 | Joseph Ntahompagaze | Joseph Ntahompagaze, Shambel Sahlu, Amare Abebe and Manasse R. Mbonye | On multifluid perturbations in scalar-tensor cosmology | Accepted for International Journal of Modern Physics D | null | 10.1142/S0218271820501205 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this paper the scalar-tensor theory is applied to the study of
perturbations in a multi-fluid universe, using the 1+3 covariant approach. Both
scalar and harmonic decompositions are instituted on the perturbation
equations. In particular, as an application, we study perturbations on a
background FRW cosmology cons... | [
{
"created": "Thu, 26 Nov 2020 09:48:24 GMT",
"version": "v1"
}
] | 2020-11-30 | [
[
"Ntahompagaze",
"Joseph",
""
],
[
"Sahlu",
"Shambel",
""
],
[
"Abebe",
"Amare",
""
],
[
"Mbonye",
"Manasse R.",
""
]
] | In this paper the scalar-tensor theory is applied to the study of perturbations in a multi-fluid universe, using the 1+3 covariant approach. Both scalar and harmonic decompositions are instituted on the perturbation equations. In particular, as an application, we study perturbations on a background FRW cosmology consis... |
2009.11410 | Maria Skugoreva | Maria A. Skugoreva, Alexey V. Toporensky | Bouncing solutions in $f(T)$ gravity | 11 pages, 5 figures, v3: some corrections, published version | Eur. Phys. J. C 80 (2020) no. 11, 1054 | 10.1140/epjc/s10052-020-08638-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider certain aspects of cosmological dynamics of a spatially curved
Universe in $f(T)$ gravity. Local analysis allows us to find conditions for
bounces and for static solutions; these conditions appear to be in general less
restrictive than in general relativity. We also provide a global analysis of
the corres... | [
{
"created": "Wed, 23 Sep 2020 22:41:01 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Oct 2020 01:01:30 GMT",
"version": "v2"
},
{
"created": "Tue, 8 Jun 2021 20:34:07 GMT",
"version": "v3"
}
] | 2021-06-10 | [
[
"Skugoreva",
"Maria A.",
""
],
[
"Toporensky",
"Alexey V.",
""
]
] | We consider certain aspects of cosmological dynamics of a spatially curved Universe in $f(T)$ gravity. Local analysis allows us to find conditions for bounces and for static solutions; these conditions appear to be in general less restrictive than in general relativity. We also provide a global analysis of the correspo... |
gr-qc/0009096 | Roberto Scipioni | Roberto Mignani (University of Rome III) Roberto Scipioni (University
of British Columbia) | On the solutions of the Cartan equation in Metric Affine Gravity | To appear in General Relativity and Gravitation | Gen.Rel.Grav. 33 (2001) 683-711 | 10.1023/A:1010222015861 | null | gr-qc | null | In the Tucker-Wang approach to Metric Affine gravity we review some
particular solutions of the Cartan equation for the non-riemannian part of the
connection. As application we show how a quite general non Riemannian model
gives a Proca type equation for the trace of the nonmetricity 1-forms Q.
| [
{
"created": "Thu, 28 Sep 2000 17:17:52 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Mignani",
"Roberto",
"",
"University of Rome III"
],
[
"Scipioni",
"Roberto",
"",
"University\n of British Columbia"
]
] | In the Tucker-Wang approach to Metric Affine gravity we review some particular solutions of the Cartan equation for the non-riemannian part of the connection. As application we show how a quite general non Riemannian model gives a Proca type equation for the trace of the nonmetricity 1-forms Q. |
gr-qc/0507048 | Dario Zappala | C. M. L. de Aragao, M. Consoli, A. Grillo | Extra dimensions, preferred frames and ether-drift experiments | 15 pages, Latex, no figures | null | null | null | gr-qc astro-ph hep-ph | null | Models with extra space-time dimensions produce, tipically, a 4D effective
theory whose vacuum is not exactly Lorentz invariant but can be considered a
physical medium whose refractive index is determined by the gravitational
field. This leads to a version of relativity with a preferred frame and to look
for experime... | [
{
"created": "Tue, 12 Jul 2005 08:41:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"de Aragao",
"C. M. L.",
""
],
[
"Consoli",
"M.",
""
],
[
"Grillo",
"A.",
""
]
] | Models with extra space-time dimensions produce, tipically, a 4D effective theory whose vacuum is not exactly Lorentz invariant but can be considered a physical medium whose refractive index is determined by the gravitational field. This leads to a version of relativity with a preferred frame and to look for experiment... |
0804.3852 | Farook Rahaman | F.Rahaman, M.Kalam and K. A. Rahman | Conical thin shell wormhole from global monopole: A theoretical
construction | Some chages have been done | Acta Phys.Polon.B40:1575-1590,2009 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By applying 'Darmois-Israel formalism', we establish a new class of thin
shell wormhole in the context of global monopole resulting from the breaking of
a global O(3) symmetry. Since global monopole is asymptotically conical (no
longer asymptotically flat), we call it as conical thin shell wormhole.
Different charact... | [
{
"created": "Thu, 24 Apr 2008 06:57:19 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Nov 2008 11:24:53 GMT",
"version": "v2"
}
] | 2009-07-24 | [
[
"Rahaman",
"F.",
""
],
[
"Kalam",
"M.",
""
],
[
"Rahman",
"K. A.",
""
]
] | By applying 'Darmois-Israel formalism', we establish a new class of thin shell wormhole in the context of global monopole resulting from the breaking of a global O(3) symmetry. Since global monopole is asymptotically conical (no longer asymptotically flat), we call it as conical thin shell wormhole. Different character... |
1212.4810 | Francois Foucart | Francois Foucart, M. Brett Deaton, Matthew D. Duez, Lawrence E.
Kidder, Ilana MacDonald, Christian D. Ott, Harald P. Pfeiffer, Mark A.
Scheel, Bela Szilagyi, and Saul A. Teukolsky | Black hole-neutron star mergers at realistic mass ratios: Equation of
state and spin orientation effects | 25 pages, 16 Figures, updated to match published version | Phys. Rev. D 87, 084006 (2013) | 10.1103/PhysRevD.87.084006 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black hole-neutron star mergers resulting in the disruption of the neutron
star and the formation of an accretion disk and/or the ejection of unbound
material are prime candidates for the joint detection of gravitational-wave and
electromagnetic signals when the next generation of gravitational-wave
detectors comes o... | [
{
"created": "Wed, 19 Dec 2012 20:08:25 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Apr 2013 14:51:21 GMT",
"version": "v2"
}
] | 2013-04-19 | [
[
"Foucart",
"Francois",
""
],
[
"Deaton",
"M. Brett",
""
],
[
"Duez",
"Matthew D.",
""
],
[
"Kidder",
"Lawrence E.",
""
],
[
"MacDonald",
"Ilana",
""
],
[
"Ott",
"Christian D.",
""
],
[
"Pfeiffer",
"Harald P.",
... | Black hole-neutron star mergers resulting in the disruption of the neutron star and the formation of an accretion disk and/or the ejection of unbound material are prime candidates for the joint detection of gravitational-wave and electromagnetic signals when the next generation of gravitational-wave detectors comes onl... |
1702.08187 | Angela D. V. Di Virgilio dr | Angela D. V. Di Virgilio, Wei-Tou Ni, Wei-Tou Ni, Sperello di Serego
Alighieri, Hung-Yi Pu, Sheau-shi Pan | Observational and Experimental Gravity | 1 figure, Second LeCosPa Simposium, December 2015, Taipei Taiwan | Everything about Gravity, World Scientific, pp. 341-346, 2016 | 10.1142/9789813203952_0044 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We indicate the progress of experimental gravity, present an outlook in this
field, and summarise the Observational/Experimental Parallel Session together
with a related plenary talk on gravitational waves of the 2nd LeCosPA
Symposium.
| [
{
"created": "Mon, 27 Feb 2017 08:34:35 GMT",
"version": "v1"
}
] | 2017-02-28 | [
[
"Di Virgilio",
"Angela D. V.",
""
],
[
"Ni",
"Wei-Tou",
""
],
[
"Ni",
"Wei-Tou",
""
],
[
"Alighieri",
"Sperello di Serego",
""
],
[
"Pu",
"Hung-Yi",
""
],
[
"Pan",
"Sheau-shi",
""
]
] | We indicate the progress of experimental gravity, present an outlook in this field, and summarise the Observational/Experimental Parallel Session together with a related plenary talk on gravitational waves of the 2nd LeCosPA Symposium. |
2309.00205 | Mohammad Bagher Jahani Poshteh | Amjad Ashoorioon, Mohammad Bagher Jahani Poshteh, Robert B. Mann | Measuring black hole spin through gravitational lensing of pulsars | 6 pages, 1 figure | null | null | null | gr-qc astro-ph.CO hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We put forward a new procedure for measuring the spin of a black hole with
unprecedented accuracy based on gravitational lensing of millisecond pulsars.
The deflection angle of light increases by increasing the rotation parameter.
For primary and secondary images the angular positions are larger for rotating
black ho... | [
{
"created": "Fri, 1 Sep 2023 01:48:07 GMT",
"version": "v1"
}
] | 2023-09-04 | [
[
"Ashoorioon",
"Amjad",
""
],
[
"Poshteh",
"Mohammad Bagher Jahani",
""
],
[
"Mann",
"Robert B.",
""
]
] | We put forward a new procedure for measuring the spin of a black hole with unprecedented accuracy based on gravitational lensing of millisecond pulsars. The deflection angle of light increases by increasing the rotation parameter. For primary and secondary images the angular positions are larger for rotating black hole... |
1107.2633 | Francesca Vidotto | Francesca Vidotto | Many-nodes/many-links spinfoam: the homogeneous and isotropic case | 8 pages, 4 figures | Class.QuantumGrav.28:245005,2011 | 10.1088/0264-9381/28/24/245005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I compute the Lorentzian EPRL/FK/KKL spinfoam vertex amplitude for regular
graphs, with an arbitrary number of links and nodes, and coherent states peaked
on a homogeneous and isotropic geometry. This form of the amplitude can be
applied for example to a dipole with an arbitrary number of links or to the
4-simplex gi... | [
{
"created": "Wed, 13 Jul 2011 19:18:34 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jul 2011 14:57:46 GMT",
"version": "v2"
},
{
"created": "Thu, 13 Oct 2011 11:47:34 GMT",
"version": "v3"
}
] | 2012-05-22 | [
[
"Vidotto",
"Francesca",
""
]
] | I compute the Lorentzian EPRL/FK/KKL spinfoam vertex amplitude for regular graphs, with an arbitrary number of links and nodes, and coherent states peaked on a homogeneous and isotropic geometry. This form of the amplitude can be applied for example to a dipole with an arbitrary number of links or to the 4-simplex give... |
0906.2617 | Israel Quiros | Israel Quiros, Tame Gonzalez, Dania Gonzalez, Yunelsy Napoles, Ricardo
Garcia-Salcedo and Claudia Moreno | Study Of Tachyon Dynamics For Broad Classes of Potentials | 13 pages, latex, 4 eps figures. Title changed, authors added,
motivation rewritten, discussion improved, references added. To match the
published version | Class.Quant.Grav.27:215021,2010 | 10.1088/0264-9381/27/21/215021 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate in detail the asymptotic properties of tachyon cosmology for a
broad class of self-interaction potentials. The present approach relies in an
appropriate re-definition of the tachyon field, which, in conjunction with a
method formerly applied in the bibliography in a different context, allows to
general... | [
{
"created": "Mon, 15 Jun 2009 12:45:21 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Dec 2009 20:04:07 GMT",
"version": "v2"
},
{
"created": "Tue, 13 Apr 2010 14:45:36 GMT",
"version": "v3"
},
{
"created": "Tue, 12 Oct 2010 20:03:57 GMT",
"version": "v4"
}
] | 2011-03-28 | [
[
"Quiros",
"Israel",
""
],
[
"Gonzalez",
"Tame",
""
],
[
"Gonzalez",
"Dania",
""
],
[
"Napoles",
"Yunelsy",
""
],
[
"Garcia-Salcedo",
"Ricardo",
""
],
[
"Moreno",
"Claudia",
""
]
] | We investigate in detail the asymptotic properties of tachyon cosmology for a broad class of self-interaction potentials. The present approach relies in an appropriate re-definition of the tachyon field, which, in conjunction with a method formerly applied in the bibliography in a different context, allows to generaliz... |
2212.11798 | Marc Mars | Piotr T. Chru\'sciel and Marc Mars | Analyticity of stationary spacetimes from maximal hypersurfaces | 11 pages, no figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The standard method of proving analyticity of stationary vacuum metrics
invokes the quotient-space version of Einstein equations. We verify that the
same conclusion can be obtained using the KID equations on maximal surfaces.
| [
{
"created": "Thu, 22 Dec 2022 15:27:59 GMT",
"version": "v1"
}
] | 2022-12-23 | [
[
"Chruściel",
"Piotr T.",
""
],
[
"Mars",
"Marc",
""
]
] | The standard method of proving analyticity of stationary vacuum metrics invokes the quotient-space version of Einstein equations. We verify that the same conclusion can be obtained using the KID equations on maximal surfaces. |
1812.00384 | Wan Cong Ms | Niloofar Abbasvandi, Wan Cong, David Kubiznak, Robert B. Mann | Snapping swallowtails in accelerating black hole thermodynamics | 18 pages, 8 figures. Accepted for publication in Classical and
Quantum Gravity | null | 10.1088/1361-6382/ab129f | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The thermodynamic behaviour of a charged and accelerating AdS black hole is
studied in the context of extended phase space with variable cosmological
constant. When compared to the charged AdS black hole without acceleration, a
remarkable new feature of `snapping swallowtails' appears. Namely, for any
black hole with... | [
{
"created": "Sun, 2 Dec 2018 13:03:06 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Mar 2019 00:52:20 GMT",
"version": "v2"
}
] | 2019-05-22 | [
[
"Abbasvandi",
"Niloofar",
""
],
[
"Cong",
"Wan",
""
],
[
"Kubiznak",
"David",
""
],
[
"Mann",
"Robert B.",
""
]
] | The thermodynamic behaviour of a charged and accelerating AdS black hole is studied in the context of extended phase space with variable cosmological constant. When compared to the charged AdS black hole without acceleration, a remarkable new feature of `snapping swallowtails' appears. Namely, for any black hole with c... |
1701.06900 | Tahir Hussain | Tahir Hussain, Sumaira Saleem Akhtar and Fawad Khan | Classification of LRS Bianchi type I Spacetimes via Conformal Ricci
Collineations | 24 pages | null | 10.1142/S0219887818500068 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we present a complete classification of Locally Rotationally
Symmetric (LRS) Bianchi type I spacetimes according to their Conformal Ricci
Collineations (CRCs). When the Ricci tensor is non-degenerate, a general form
of the vector field generating CRCs is found, subject to some integrability
conditions.... | [
{
"created": "Thu, 19 Jan 2017 11:58:08 GMT",
"version": "v1"
}
] | 2018-01-10 | [
[
"Hussain",
"Tahir",
""
],
[
"Akhtar",
"Sumaira Saleem",
""
],
[
"Khan",
"Fawad",
""
]
] | In this paper, we present a complete classification of Locally Rotationally Symmetric (LRS) Bianchi type I spacetimes according to their Conformal Ricci Collineations (CRCs). When the Ricci tensor is non-degenerate, a general form of the vector field generating CRCs is found, subject to some integrability conditions. S... |
1412.6837 | Giulio D'Odorico | Alessandro Codello and Giulio D'Odorico | Scaling and Renormalization in two dimensional Quantum Gravity | 39 pages | Phys. Rev. D 92, 024026 (2015) | 10.1103/PhysRevD.92.024026 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study scaling and renormalization in two dimensional quantum gravity in a
covariant framework. After reviewing the definition of a proper path integral
measure, we use scaling arguments to rederive the KPZ relations, the fractal
dimension of the theory and the scaling of the reparametrization-invariant two
point f... | [
{
"created": "Sun, 21 Dec 2014 21:34:33 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Feb 2015 20:09:07 GMT",
"version": "v2"
}
] | 2015-07-22 | [
[
"Codello",
"Alessandro",
""
],
[
"D'Odorico",
"Giulio",
""
]
] | We study scaling and renormalization in two dimensional quantum gravity in a covariant framework. After reviewing the definition of a proper path integral measure, we use scaling arguments to rederive the KPZ relations, the fractal dimension of the theory and the scaling of the reparametrization-invariant two point fun... |
1605.01271 | Rogerio Cavalcanti Teixeira | R. T. Cavalcanti, A. Goncalves da Silva and Roldao da Rocha | Strong Deflection Limit Lensing Effects in the Minimal Geometric
Deformation and Casadio-Fabbri-Mazzacurati Solutions | null | Class. Quantum Grav. 33 (2016) 215007 | 10.1088/0264-9381/33/21/215007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we apply the strong deflection limit approach to investigate
the gravitational lensing phenomena beyond general relativity. This is
accomplished by considering the lensing effects related to black hole solutions
that emerge out of the domain of Einstein gravity, namely, the ones acquired
from the method... | [
{
"created": "Tue, 3 May 2016 00:44:39 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Oct 2016 17:38:22 GMT",
"version": "v2"
}
] | 2016-10-13 | [
[
"Cavalcanti",
"R. T.",
""
],
[
"da Silva",
"A. Goncalves",
""
],
[
"da Rocha",
"Roldao",
""
]
] | In this paper we apply the strong deflection limit approach to investigate the gravitational lensing phenomena beyond general relativity. This is accomplished by considering the lensing effects related to black hole solutions that emerge out of the domain of Einstein gravity, namely, the ones acquired from the method o... |
1005.2205 | Peter Dunsby | Peter K. S. Dunsby, Emilio Elizalde, Rituparno Goswami, Sergei
Odintsov and Diego Saez-Gomez | On the LCDM Universe in f(R) gravity | 7 pages, accepted for publication in PRD | Phys.Rev.D82:023519,2010 | 10.1103/PhysRevD.82.023519 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several different explicit reconstructions of f(R) gravity are obtained from
the background FRW expansion history. It is shown that the only theory whose
Lagrangian is a simple function of the Ricci scalar R, that admits an exact
LCDM expansion history is standard General Relativity with a positive
cosmological const... | [
{
"created": "Wed, 12 May 2010 20:52:46 GMT",
"version": "v1"
},
{
"created": "Mon, 17 May 2010 19:29:28 GMT",
"version": "v2"
},
{
"created": "Wed, 7 Jul 2010 13:59:28 GMT",
"version": "v3"
}
] | 2014-11-21 | [
[
"Dunsby",
"Peter K. S.",
""
],
[
"Elizalde",
"Emilio",
""
],
[
"Goswami",
"Rituparno",
""
],
[
"Odintsov",
"Sergei",
""
],
[
"Saez-Gomez",
"Diego",
""
]
] | Several different explicit reconstructions of f(R) gravity are obtained from the background FRW expansion history. It is shown that the only theory whose Lagrangian is a simple function of the Ricci scalar R, that admits an exact LCDM expansion history is standard General Relativity with a positive cosmological constan... |
1611.06025 | Wei-Tou Ni | Wei-Tou Ni | Solar-system tests of the relativistic gravity | 30 pages, 3 tables, Chapter 8 in One Hundred Years of General
Relativity: From Genesis and Empirical Foundations to Gravitational Waves,
Cosmology and Quantum Gravity, ed. W.-T. Ni (World Scientific, Singapore,
2016); matches the published version of IJMPD. This article is an 11-year
update of the solar-system ... | International Journal of Modern Physics D, Vol. 25, No. 14 (2016)
1630003 (36 pages) | 10.1142/S0218271816300032 | null | gr-qc astro-ph.EP astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In 1859, Le Verrier discovered the Mercury perihelion advance anomaly. This
anomaly turned out to be the first relativistic-gravity effect observed. During
the 157 years to 2016, the precisions and accuracies of laboratory and space
experiments, and of astrophysical and cosmological observations on relativistic
gravi... | [
{
"created": "Fri, 18 Nov 2016 10:00:55 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Dec 2016 07:47:27 GMT",
"version": "v2"
}
] | 2016-12-28 | [
[
"Ni",
"Wei-Tou",
""
]
] | In 1859, Le Verrier discovered the Mercury perihelion advance anomaly. This anomaly turned out to be the first relativistic-gravity effect observed. During the 157 years to 2016, the precisions and accuracies of laboratory and space experiments, and of astrophysical and cosmological observations on relativistic gravity... |
1002.1172 | Martin Reiris | Martin Reiris | Stationary solutions and asymptotic flatness I | The original submission was revised and divided in two: Stationary
solutions and asymptotic flatness I & Stationary solutions and asymptotic
flatness II | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article and its sequel we discuss the asymptotic structure of
space-times representing isolated bodies in General Relativity. Such
space-times are usually required to be asymptotically flat (AF), and thus to
have a prescribed type of asymptotic. Despite all the "reasonable" that the
requirement is, it seems t... | [
{
"created": "Fri, 5 Feb 2010 09:52:47 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Nov 2011 19:56:13 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Oct 2013 14:49:47 GMT",
"version": "v3"
}
] | 2013-10-02 | [
[
"Reiris",
"Martin",
""
]
] | In this article and its sequel we discuss the asymptotic structure of space-times representing isolated bodies in General Relativity. Such space-times are usually required to be asymptotically flat (AF), and thus to have a prescribed type of asymptotic. Despite all the "reasonable" that the requirement is, it seems to ... |
1907.01269 | Prado Martin-Moruno | Prado Mart\'in-Moruno, Matt Visser | The type III stress-energy tensor: Ugly Duckling of the Hawking-Ellis
classification | V3: 6 references added, some clarifications included, changes in
notation, no physics changes, matches published version. V2: 1 reference
added. V1: 23 pages | null | 10.1088/1361-6382/ab56f6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present some advances in the understanding of type III stress-energy
tensors as per the Hawking-Ellis classification. Type I and type II naturally
appear in classical situations, and can also describe semiclassical effects.
Type IV often shows up in semiclassical gravity. Type III is much more subtle.
We focus our... | [
{
"created": "Tue, 2 Jul 2019 10:01:24 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Jul 2019 07:24:03 GMT",
"version": "v2"
},
{
"created": "Wed, 13 Nov 2019 10:11:54 GMT",
"version": "v3"
}
] | 2019-11-14 | [
[
"Martín-Moruno",
"Prado",
""
],
[
"Visser",
"Matt",
""
]
] | We present some advances in the understanding of type III stress-energy tensors as per the Hawking-Ellis classification. Type I and type II naturally appear in classical situations, and can also describe semiclassical effects. Type IV often shows up in semiclassical gravity. Type III is much more subtle. We focus our a... |
gr-qc/0301046 | Dzhunushaliev Vladimir | V. Dzhunushaliev | $\Delta-$string - a hybrid between wormhole and string | 5 pages, LATEX | Gen.Rel.Grav. 35 (2003) 1481-1488 | 10.1023/A:1024542903983 | null | gr-qc hep-th | null | The flux tube solutions in 5D Kaluza-Klein theory can be considered as a
string-like object - $\Delta-$string. The initial 5D metric can be reduced to
some inner degrees of freedom living on the $\Delta-$string. The propagation of
electromagnetic waves through the $\Delta-$string is considered. It is shown
that the d... | [
{
"created": "Tue, 14 Jan 2003 04:19:13 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Dzhunushaliev",
"V.",
""
]
] | The flux tube solutions in 5D Kaluza-Klein theory can be considered as a string-like object - $\Delta-$string. The initial 5D metric can be reduced to some inner degrees of freedom living on the $\Delta-$string. The propagation of electromagnetic waves through the $\Delta-$string is considered. It is shown that the dif... |
0707.0368 | Salvatore Capozziello | S. Capozziello, Ch. Corda, M De Laurentis | Stochastic background of relic scalar gravitational waves from
scalar-tensor gravity | 7 pages, 1 figure | Mod.Phys.Lett.A22:2647-2655,2007 | 10.1142/S021773230702573X | null | gr-qc | null | A stochastic background of relic gravitational waves is achieved by the so
called adiabatically-amplified zero-point fluctuations process derived from
early inflation. In principle, it provides a distinctive spectrum of relic
gravitational waves. In the framework of scalar-tensor gravity, we discuss the
scalar modes ... | [
{
"created": "Tue, 3 Jul 2007 09:11:09 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Capozziello",
"S.",
""
],
[
"Corda",
"Ch.",
""
],
[
"De Laurentis",
"M",
""
]
] | A stochastic background of relic gravitational waves is achieved by the so called adiabatically-amplified zero-point fluctuations process derived from early inflation. In principle, it provides a distinctive spectrum of relic gravitational waves. In the framework of scalar-tensor gravity, we discuss the scalar modes of... |
1311.7137 | Carlos Molina Mendes | C. Molina | Deformations of the vacuum solutions of general relativity subjected to
linear constraints | 4 pages | Phys. Rev. D 88, 127501 (2013) | 10.1103/PhysRevD.88.127501 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The problem of deforming geometries is particularly important in the context
of constructing new exact solutions of Einstein's equation. This issue often
appears when extensions of the general relativity are treated, for instance in
brane world scenarios. In this paper we investigate spacetimes in which the
energy-mo... | [
{
"created": "Wed, 27 Nov 2013 12:15:13 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Apr 2014 21:27:24 GMT",
"version": "v2"
}
] | 2014-04-11 | [
[
"Molina",
"C.",
""
]
] | The problem of deforming geometries is particularly important in the context of constructing new exact solutions of Einstein's equation. This issue often appears when extensions of the general relativity are treated, for instance in brane world scenarios. In this paper we investigate spacetimes in which the energy-mome... |
1904.05112 | Oliver J. Tattersall | Oliver J. Tattersall, Pedro G. Ferreira | Forecasts for Low Spin Black Hole Spectroscopy in Horndeski Gravity | Updated to match published version | Phys. Rev. D 99, 104082 (2019) | 10.1103/PhysRevD.99.104082 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the prospect of using black hole spectroscopy to constrain the
parameters of Horndeski gravity through observations of gravitational waves
from perturbed black holes. We study the gravitational waves emitted during
ringdown from black holes without hair in Horndeski gravity, demonstrating the
qualitati... | [
{
"created": "Wed, 10 Apr 2019 11:30:39 GMT",
"version": "v1"
},
{
"created": "Mon, 13 May 2019 12:47:37 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Jun 2019 11:59:11 GMT",
"version": "v3"
}
] | 2019-06-18 | [
[
"Tattersall",
"Oliver J.",
""
],
[
"Ferreira",
"Pedro G.",
""
]
] | We investigate the prospect of using black hole spectroscopy to constrain the parameters of Horndeski gravity through observations of gravitational waves from perturbed black holes. We study the gravitational waves emitted during ringdown from black holes without hair in Horndeski gravity, demonstrating the qualitative... |
1507.02306 | Carlos Hidalgo | Roberto A. Sussman and I. Delgado Gaspar and Juan Carlos Hidalgo | Coarse-grained description of cosmic structure from Szekeres models | V3: Discussion of the expansion eigenvalues and of the Zeldovich
approximation added. Figures modified accordingly. References updated.
Version accepted for publication in JCAP | null | 10.1088/1475-7516/2016/03/012 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the full dynamical freedom of the well known Szekeres models
allows for the description of elaborated 3--dimensional networks of cold dark
matter structures (over--densities and/or density voids) undergoing "pancake"
collapse. By reducing Einstein's field equations to a set of evolution
equations, which ... | [
{
"created": "Wed, 8 Jul 2015 20:46:43 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Nov 2015 19:22:35 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Feb 2016 23:43:54 GMT",
"version": "v3"
}
] | 2016-03-23 | [
[
"Sussman",
"Roberto A.",
""
],
[
"Gaspar",
"I. Delgado",
""
],
[
"Hidalgo",
"Juan Carlos",
""
]
] | We show that the full dynamical freedom of the well known Szekeres models allows for the description of elaborated 3--dimensional networks of cold dark matter structures (over--densities and/or density voids) undergoing "pancake" collapse. By reducing Einstein's field equations to a set of evolution equations, which th... |
2205.12531 | Hee-Suk Cho | Hee-Suk Cho | Systematic bias due to eccentricity in parameter estimation for merging
binary neutron stars | 16 pages, 18 figures, version published in PRD | Phys. Rev. D 105, 124022 (2022) | 10.1103/PhysRevD.105.124022 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study the impact of eccentricity on gravitational-wave parameter
estimation for binary neutron star systems. For signals with small eccentricity
injected into the advanced LIGO sensitivity, we perform Bayesian parameter
estimation using the circular waveform model and show how the recovered
parameters can be biase... | [
{
"created": "Wed, 25 May 2022 06:55:59 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Jun 2022 14:48:19 GMT",
"version": "v2"
}
] | 2022-06-13 | [
[
"Cho",
"Hee-Suk",
""
]
] | We study the impact of eccentricity on gravitational-wave parameter estimation for binary neutron star systems. For signals with small eccentricity injected into the advanced LIGO sensitivity, we perform Bayesian parameter estimation using the circular waveform model and show how the recovered parameters can be biased ... |
gr-qc/0012037 | Christian Heinicke | Christian Heinicke | The Einstein 3-form G_a and its equivalent 1-form L_a in Riemann-Cartan
space | LaTeX, 13 Pages. To appear in Gen. Rel. Grav | Gen.Rel.Grav. 33 (2001) 1115-1130 | 10.1023/A:1010236517022 | null | gr-qc | null | The definition of the Einstein 3-form G_a is motivated by means of the
contracted 2nd Bianchi identity. This definition involves at first the complete
curvature 2-form. The 1-form L_a is defined via G_a = L^b \wedge #(o_b \wedge
o_a). Here # denotes the Hodge-star, o_a the coframe, and \wedge the exterior
product. Th... | [
{
"created": "Mon, 11 Dec 2000 12:37:31 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Heinicke",
"Christian",
""
]
] | The definition of the Einstein 3-form G_a is motivated by means of the contracted 2nd Bianchi identity. This definition involves at first the complete curvature 2-form. The 1-form L_a is defined via G_a = L^b \wedge #(o_b \wedge o_a). Here # denotes the Hodge-star, o_a the coframe, and \wedge the exterior product. The ... |
2305.07742 | Tobias Mistele | Tobias Mistele | A new scale in the quasi-static limit of Aether Scalar Tensor Theory | 16 pages, 6 figures; accepted for publication in PRD | null | null | null | gr-qc astro-ph.CO astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the aims of Aether Scalar Tensor Theory (AeST) is to reproduce the
successes of Modified Newtonian Dynamics (MOND) on galactic scales. Indeed, the
quasi-static limit of AeST achieves precisely this, assuming that the vector
field $\vec{A}$ vanishes and that the so-called ghost condensate can be
neglected. The ... | [
{
"created": "Fri, 12 May 2023 19:55:45 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Jun 2023 18:51:35 GMT",
"version": "v2"
},
{
"created": "Fri, 21 Jun 2024 16:22:15 GMT",
"version": "v3"
}
] | 2024-06-24 | [
[
"Mistele",
"Tobias",
""
]
] | One of the aims of Aether Scalar Tensor Theory (AeST) is to reproduce the successes of Modified Newtonian Dynamics (MOND) on galactic scales. Indeed, the quasi-static limit of AeST achieves precisely this, assuming that the vector field $\vec{A}$ vanishes and that the so-called ghost condensate can be neglected. The ef... |
0802.3629 | Sigbjorn Hervik | A. Coley and S. Hervik | Bianchi models with vorticity: The type III bifurcation | 12 pages | Class. Quantum Grav. 25 (2008) 198001 | 10.1088/0264-9381/25/19/198001 | null | gr-qc astro-ph math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the late-time behaviour of tilted perfect fluid Bianchi type III
models using a dynamical systems approach. We consider models with dust, and
perfect fluids stiffer than dust, and eludicate the late-time behaviour by
studying the centre manifold which dominates the behaviour of the model at late
times. In th... | [
{
"created": "Mon, 25 Feb 2008 14:21:36 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Coley",
"A.",
""
],
[
"Hervik",
"S.",
""
]
] | We study the late-time behaviour of tilted perfect fluid Bianchi type III models using a dynamical systems approach. We consider models with dust, and perfect fluids stiffer than dust, and eludicate the late-time behaviour by studying the centre manifold which dominates the behaviour of the model at late times. In the ... |
gr-qc/9810063 | Ram Brustein | Ram Brustein | Production and Detection of Cosmic Gravitational Wave Background in
String Cosmology | 21 pages, 3 figures, Revtex. Invited paper to appear in the special
issue of the Journal of Chaos, Solitons and Fractals on "Superstrings, M, F,
S... Theory", eds. C. Castro and M.S. El Naschie | null | 10.1016/S0960-0779(98)00196-9 | BGU-PH-98/06 | gr-qc astro-ph | null | String cosmology models predict a cosmic background of gravitational waves
produced during a period of dilaton-driven inflation. I describe the
background, present astrophysical and cosmological bounds on it, and discuss in
some detail how it may be possible to detect it with large operating and
planned gravitational... | [
{
"created": "Tue, 20 Oct 1998 13:48:26 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Brustein",
"Ram",
""
]
] | String cosmology models predict a cosmic background of gravitational waves produced during a period of dilaton-driven inflation. I describe the background, present astrophysical and cosmological bounds on it, and discuss in some detail how it may be possible to detect it with large operating and planned gravitational w... |
1404.0898 | Marta Campigotto | M.Campigotto, L.Fatibene | Gauge Natural Formulation of Conformal Theory of Gravity | 13 pages, calculations added, matches published version on Annals of
Physics | Annals of Physics, Volume 354, 328 (2015) | 10.1016/j.aop.2014.12.026 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider conformal gravity as a gauge natural theory. We study its
conservation laws and superpotentials. We also consider the Mannheim and
Kazanas spherically symmetric vacuum solution and discuss conserved quantities
associated to conformal and diffeomorphism symmetries.
| [
{
"created": "Thu, 3 Apr 2014 13:19:22 GMT",
"version": "v1"
},
{
"created": "Sun, 8 Feb 2015 14:19:47 GMT",
"version": "v2"
}
] | 2015-02-10 | [
[
"Campigotto",
"M.",
""
],
[
"Fatibene",
"L.",
""
]
] | We consider conformal gravity as a gauge natural theory. We study its conservation laws and superpotentials. We also consider the Mannheim and Kazanas spherically symmetric vacuum solution and discuss conserved quantities associated to conformal and diffeomorphism symmetries. |
1003.2476 | Paul Wesson | Paul S. Wesson | The Scalar Field Of 5D Gravity And The Higgs Field Of 4D Particle
Physics: A Possible Connection | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The main results are reviewed of relating the scalar field of noncompactified
Kaluza-Klein gravity to the Higgs field of particle physics. The embedding of
4D spacetime in a 5D manifold can result in a variable cosmological 'constant'
and particle masses tiny compared to the Planck value.
| [
{
"created": "Fri, 12 Mar 2010 04:50:00 GMT",
"version": "v1"
}
] | 2010-03-15 | [
[
"Wesson",
"Paul S.",
""
]
] | The main results are reviewed of relating the scalar field of noncompactified Kaluza-Klein gravity to the Higgs field of particle physics. The embedding of 4D spacetime in a 5D manifold can result in a variable cosmological 'constant' and particle masses tiny compared to the Planck value. |
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