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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2207.01276 | Rocco D'Agostino | Salvatore Capozziello, Rocco D'Agostino, Orlando Luongo | The phase-space view of non-local gravity cosmology | 9 pages, 2 figures, 2 tables. Accepted for publication in Physics
Letters B | null | 10.1016/j.physletb.2022.137475 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider non-local Integral Kernel Theories of Gravity in a homogeneous
and isotropic universe background as a possible scenario to drive the cosmic
history. In particular, we investigate the cosmological properties of a
gravitational action containing the inverse d'Alembert operator of the Ricci
scalar proposed t... | [
{
"created": "Mon, 4 Jul 2022 09:09:09 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Sep 2022 13:56:16 GMT",
"version": "v2"
}
] | 2022-09-30 | [
[
"Capozziello",
"Salvatore",
""
],
[
"D'Agostino",
"Rocco",
""
],
[
"Luongo",
"Orlando",
""
]
] | We consider non-local Integral Kernel Theories of Gravity in a homogeneous and isotropic universe background as a possible scenario to drive the cosmic history. In particular, we investigate the cosmological properties of a gravitational action containing the inverse d'Alembert operator of the Ricci scalar proposed to ... |
gr-qc/0205131 | Kirill Bronnikov | K.A. Bronnikov and S. Grinyok (Moscow) | Charged wormholes with non-minimally coupled scalar fields. Existence
and stability | Latex2e, 6 pages. Contribution to Festschrift in honour of Prof.
Mario Novello | null | null | null | gr-qc | null | Static, spherically symmetric, traversable wormhole solutions with electric
or magnetic charges are shown to exist in general relativity in the presence of
scalar fields nonminimally coupled to gravity. These wormholes, however, turn
out to be unstable under spherically symmetric perturbations. The instability
is rel... | [
{
"created": "Thu, 30 May 2002 20:35:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bronnikov",
"K. A.",
"",
"Moscow"
],
[
"Grinyok",
"S.",
"",
"Moscow"
]
] | Static, spherically symmetric, traversable wormhole solutions with electric or magnetic charges are shown to exist in general relativity in the presence of scalar fields nonminimally coupled to gravity. These wormholes, however, turn out to be unstable under spherically symmetric perturbations. The instability is relat... |
gr-qc/0701145 | Matthew D. Duez | Matthew D. Duez, Yuk Tung Liu, Stuart L. Shapiro, Masaru Shibata,
Branson C. Stephens | The Final Fate of Binary Neutron Stars: What Happens After the Merger? | 3 pages. To appear in the Proceedings of the Eleventh Marcel
Grossmann Meeting, Berlin, Germany, 23-29 July 2006, World Scientific,
Singapore (2007) | null | 10.1142/9789812834300_0209 | null | gr-qc astro-ph | null | The merger of two neutron stars usually produces a remnant with a mass
significantly above the single (nonrotating) neutron star maximum mass. In some
cases, the remnant will be stabilized against collapse by rapid, differential
rotation. MHD-driven angular momentum transport eventually leads to the
collapse of the r... | [
{
"created": "Fri, 26 Jan 2007 21:05:36 GMT",
"version": "v1"
}
] | 2016-11-15 | [
[
"Duez",
"Matthew D.",
""
],
[
"Liu",
"Yuk Tung",
""
],
[
"Shapiro",
"Stuart L.",
""
],
[
"Shibata",
"Masaru",
""
],
[
"Stephens",
"Branson C.",
""
]
] | The merger of two neutron stars usually produces a remnant with a mass significantly above the single (nonrotating) neutron star maximum mass. In some cases, the remnant will be stabilized against collapse by rapid, differential rotation. MHD-driven angular momentum transport eventually leads to the collapse of the rem... |
gr-qc/0612027 | Irit Maor | Sourish Dutta and Irit Maor | Voids of dark energy | 9 pages, 13 figures V3: typo in equation (11) corrected | Phys.Rev.D75:063507,2007 | 10.1103/PhysRevD.75.063507 | null | gr-qc astro-ph | null | We investigate the clustering properties of a dynamical dark energy
component. In a cosmic mix of a pressureless fluid and a light scalar field, we
follow the linear evolution of spherical matter perturbations. We find that the
scalar field tends to form underdensities in response to the gravitationally
collapsing ma... | [
{
"created": "Tue, 5 Dec 2006 03:08:09 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Mar 2007 20:37:37 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Nov 2007 19:08:08 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Dutta",
"Sourish",
""
],
[
"Maor",
"Irit",
""
]
] | We investigate the clustering properties of a dynamical dark energy component. In a cosmic mix of a pressureless fluid and a light scalar field, we follow the linear evolution of spherical matter perturbations. We find that the scalar field tends to form underdensities in response to the gravitationally collapsing matt... |
gr-qc/9912034 | Anatoly Nikishov | A.I.Nikishov (P.N.Lebedev Institute of Physics, Moscow, Russia) | On energy-momentum tensors of gravitational field | 24 pages, 2 figures | Phys.Part.Nucl. 32 (2001) 1-14; Fiz.Elem.Chast.Atom.Yadra 32
(2001) 5-30 | null | null | gr-qc | null | Several energy-momentum "tensors" of gravitational field are considered and
compared in the lowest approximation. Each of them together with
energy-momentum tensor of point-like particles satisfies the conservation laws
when equations of motion of particles are the same as in general relativity. It
is shown that in N... | [
{
"created": "Thu, 9 Dec 1999 12:26:44 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Nikishov",
"A. I.",
"",
"P.N.Lebedev Institute of Physics, Moscow, Russia"
]
] | Several energy-momentum "tensors" of gravitational field are considered and compared in the lowest approximation. Each of them together with energy-momentum tensor of point-like particles satisfies the conservation laws when equations of motion of particles are the same as in general relativity. It is shown that in New... |
1907.02176 | Yujie Tan | Xiao-yu Lu, Yu-Jie Tan, and Cheng-Gang Shao | Testing Lorentz violation by the comparison of atomic clocks | Presented at the Eighth Meeting on CPT and Lorentz Symmetry,
Bloomington, Indiana, May 12-16, 2019 | null | null | null | gr-qc hep-ph | http://creativecommons.org/publicdomain/zero/1.0/ | A more complete theoretical model of testing Lorentz violation by the
comparison of atomic clocks is developed in the Robertson-Mansouri-Sexl
kinematic framework. As this frame postulates the deviation of the coordinate
transformation from the Lorentz transformation, from the viewpoint of the
transformation violation... | [
{
"created": "Thu, 4 Jul 2019 01:10:26 GMT",
"version": "v1"
}
] | 2019-07-05 | [
[
"Lu",
"Xiao-yu",
""
],
[
"Tan",
"Yu-Jie",
""
],
[
"Shao",
"Cheng-Gang",
""
]
] | A more complete theoretical model of testing Lorentz violation by the comparison of atomic clocks is developed in the Robertson-Mansouri-Sexl kinematic framework. As this frame postulates the deviation of the coordinate transformation from the Lorentz transformation, from the viewpoint of the transformation violations ... |
gr-qc/0207005 | Lorenzo Iorio | Lorenzo Iorio | On some gravitomagnetic spin-spin effects for astronomical bodies | LaTex2e, World Scientific macros, no figures, 3 tables, 9 pages.
Accepted for publication in International Journal of Modern Physics D | Int.J.Mod.Phys. D vol.12, no.1, pp. 35-44, 2003. | 10.1142/S021827180300269X | null | gr-qc astro-ph | null | In this paper we look at the gravitational spin--spin interaction between
macroscopic astronomical bodies. In particular, we calculate their
post--Newtonian orbital effects of order $\mathcal{O}(c^{-2})$ on the
trajectory of a spinning particle with proper angular momentum ${\bf s}$ moving
in the external gravitomagn... | [
{
"created": "Sun, 30 Jun 2002 15:07:53 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Sep 2002 12:38:21 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Iorio",
"Lorenzo",
""
]
] | In this paper we look at the gravitational spin--spin interaction between macroscopic astronomical bodies. In particular, we calculate their post--Newtonian orbital effects of order $\mathcal{O}(c^{-2})$ on the trajectory of a spinning particle with proper angular momentum ${\bf s}$ moving in the external gravitomagnet... |
0710.4543 | Parampreet Singh | Alejandro Corichi, Parampreet Singh | Quantum bounce and cosmic recall | Some clarifying remarks and references added. To appear in Physical
Review Letters | Phys.Rev.Lett.100:161302,2008 | 10.1103/PhysRevLett.100.161302 | IGC-07/10-02, PI-QG-66 | gr-qc hep-th | null | Loop quantum cosmology predicts that, in simple models, the big bang
singularity of classical general relativity is replaced by a quantum bounce.
Because of the extreme physical conditions near the bounce, a natural question
is whether the universe can retain, after the bounce, its memory about the
previous epoch. Mo... | [
{
"created": "Wed, 24 Oct 2007 19:47:00 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Mar 2008 18:08:23 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Corichi",
"Alejandro",
""
],
[
"Singh",
"Parampreet",
""
]
] | Loop quantum cosmology predicts that, in simple models, the big bang singularity of classical general relativity is replaced by a quantum bounce. Because of the extreme physical conditions near the bounce, a natural question is whether the universe can retain, after the bounce, its memory about the previous epoch. More... |
gr-qc/0405128 | Sukratu Barve | Sukratu Barve | Conformal transformations near Naked Singularities - I | null | Mod.Phys.Lett. A17 (2002) 1013 | 10.1142/S0217732302007594 | null | gr-qc | null | We show that the behaviour of the outgoing radial null geodesic congruence on
the boundary of the trapped region (suitably defined as a four dimensional
region) is related to the property of nakedness in spherical dust collapse. The
argument involves a conformal transformation which justifies the difference in
the Pe... | [
{
"created": "Wed, 26 May 2004 06:22:43 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Barve",
"Sukratu",
""
]
] | We show that the behaviour of the outgoing radial null geodesic congruence on the boundary of the trapped region (suitably defined as a four dimensional region) is related to the property of nakedness in spherical dust collapse. The argument involves a conformal transformation which justifies the difference in the Penr... |
2302.03872 | Farshid Soltani | Muxin Han, Carlo Rovelli, Farshid Soltani | On the geometry of the black-to-white hole transition within a single
asymptotic region | 16 pages, 12 figures | Phys. Rev. D 107, 064011 (2023) | 10.1103/PhysRevD.107.064011 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We write explicitly the complete Lorentzian metric of a singularity-free
spacetime where a black hole transitions into a white hole located in its same
asymptotic region. In particular, the metric interpolates between the black and
white horizons. The metric satisfies the Einstein field equations up to the
tunneling ... | [
{
"created": "Wed, 8 Feb 2023 04:14:43 GMT",
"version": "v1"
}
] | 2023-03-20 | [
[
"Han",
"Muxin",
""
],
[
"Rovelli",
"Carlo",
""
],
[
"Soltani",
"Farshid",
""
]
] | We write explicitly the complete Lorentzian metric of a singularity-free spacetime where a black hole transitions into a white hole located in its same asymptotic region. In particular, the metric interpolates between the black and white horizons. The metric satisfies the Einstein field equations up to the tunneling re... |
1909.11037 | Emilio Elizalde | Emilio Elizalde, Martiros Khurshudyan | Wormhole models in $f(\textit{R}, \textit{T})$ gravity | 15 pages, 7 figures, to appear in IJMPD | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Models of static wormholes within the $f(\textit{R}, \textit{T})$ extended
theory of gravity are investigated and, in particular, the family
$f(\textit{R}, \textit{T}) = R + \lambda T$, with $T = \rho + P_{r} + 2P_{l}$
being the trace of the energy-momentum tensor. Models corresponding to
different relations for the ... | [
{
"created": "Tue, 24 Sep 2019 16:42:18 GMT",
"version": "v1"
}
] | 2019-09-25 | [
[
"Elizalde",
"Emilio",
""
],
[
"Khurshudyan",
"Martiros",
""
]
] | Models of static wormholes within the $f(\textit{R}, \textit{T})$ extended theory of gravity are investigated and, in particular, the family $f(\textit{R}, \textit{T}) = R + \lambda T$, with $T = \rho + P_{r} + 2P_{l}$ being the trace of the energy-momentum tensor. Models corresponding to different relations for the pr... |
gr-qc/0601040 | Woei Chet Lim | W. C. Lim, R. J. Deeley, J. Wainwright | Tilted Bianchi VII_0 cosmologies -- the radiation bifurcation | 22 pages, no figures | Class.Quant.Grav.23:3215-3234,2006 | 10.1088/0264-9381/23/9/029 | null | gr-qc | null | We derive the late-time behaviour of tilted Bianchi VII_0 cosmologies with an
irrotational radiation fluid as source, and give the asymptotic form of the
general solution as $t \to +\infty$, making comparisons with the dust-filled
models. At first sight the radiation-filled models appear to approximate the
flat FL mo... | [
{
"created": "Wed, 11 Jan 2006 00:33:07 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Apr 2006 16:37:05 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Lim",
"W. C.",
""
],
[
"Deeley",
"R. J.",
""
],
[
"Wainwright",
"J.",
""
]
] | We derive the late-time behaviour of tilted Bianchi VII_0 cosmologies with an irrotational radiation fluid as source, and give the asymptotic form of the general solution as $t \to +\infty$, making comparisons with the dust-filled models. At first sight the radiation-filled models appear to approximate the flat FL mode... |
2201.08578 | Elham Nazari | Elham Nazari, Mahmood Roshan, Ivan De Martino | Constraining Energy-Momentum-Squared Gravity by binary pulsar
observations | 21 pages, 5 figures URL:
https://link.aps.org/doi/10.1103/PhysRevD.105.044014 | null | 10.1103/PhysRevD.105.044014 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we introduce the post-Minkowskian approximation of
Energy-Momentum-Squared Gravity (EMSG). This approximation is used to study the
gravitational energy flux in the context of EMSG. As an application of our
results, we investigate the EMSG effect on the first time derivative of the
orbital period of the... | [
{
"created": "Fri, 21 Jan 2022 07:48:12 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Feb 2022 05:20:02 GMT",
"version": "v2"
}
] | 2022-02-14 | [
[
"Nazari",
"Elham",
""
],
[
"Roshan",
"Mahmood",
""
],
[
"De Martino",
"Ivan",
""
]
] | In this paper, we introduce the post-Minkowskian approximation of Energy-Momentum-Squared Gravity (EMSG). This approximation is used to study the gravitational energy flux in the context of EMSG. As an application of our results, we investigate the EMSG effect on the first time derivative of the orbital period of the b... |
1703.06251 | Hao Zheng | H. Zheng, L. F. Wei, H. Wen, F. Y. Li | Searching for high-frequency gravitational waves by ground high field
magnetic resonant sweepings | null | Phys. Rev. D 98, 064028 (2018) | 10.1103/PhysRevD.98.064028 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | With laser interferometers, LIGO-Virgo collaboration has recently realized
the direct detections of the intermediate-frequency (i.e., from dozens to
hundreds of Hertz) gravitational waves (GWs) by probing their
mechanically-tidal responses. Alternatively, in this letter we propose a
feasible approach to actively sear... | [
{
"created": "Sat, 18 Mar 2017 04:41:36 GMT",
"version": "v1"
},
{
"created": "Sat, 13 May 2017 04:55:49 GMT",
"version": "v2"
},
{
"created": "Tue, 17 Oct 2017 11:45:48 GMT",
"version": "v3"
}
] | 2018-09-19 | [
[
"Zheng",
"H.",
""
],
[
"Wei",
"L. F.",
""
],
[
"Wen",
"H.",
""
],
[
"Li",
"F. Y.",
""
]
] | With laser interferometers, LIGO-Virgo collaboration has recently realized the direct detections of the intermediate-frequency (i.e., from dozens to hundreds of Hertz) gravitational waves (GWs) by probing their mechanically-tidal responses. Alternatively, in this letter we propose a feasible approach to actively search... |
2301.08074 | Giorgio Mentasti | Giorgio Mentasti, Carlo R. Contaldi, Marco Peloso | Intrinsic limits on the detection of the anisotropies of the Stochastic
Gravitational Wave Background | 5 pages, 2 figures | null | null | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | For any given network of detectors, and for any given integration time, even
in the idealized limit of negligible instrumental noise, the intrinsic time
variation of the isotropic component of the Stochastic Gravitational Wave
Background (SGWB) induces a limit on how accurately the anisotropies in the
SGWB can be mea... | [
{
"created": "Thu, 19 Jan 2023 13:42:22 GMT",
"version": "v1"
}
] | 2023-01-20 | [
[
"Mentasti",
"Giorgio",
""
],
[
"Contaldi",
"Carlo R.",
""
],
[
"Peloso",
"Marco",
""
]
] | For any given network of detectors, and for any given integration time, even in the idealized limit of negligible instrumental noise, the intrinsic time variation of the isotropic component of the Stochastic Gravitational Wave Background (SGWB) induces a limit on how accurately the anisotropies in the SGWB can be measu... |
1711.10073 | Edward Anderson | Edward Anderson | The Smallest Shape Spaces. II. 4 Points in 1-d Suffices to have a
Complex Background-Independent Theory of Inhomogeneity | 42 pages with 36 figures. Minor changes, a few new references | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The program of understanding Shape Theory layer by layer topologically and
geometrically -- proposed in Part I -- is now addressed for 4 points in 1-$d$.
Topological shape space graphs are far more complex here, whereas metric shape
spaces are (pieces of) spheres which admit an intricate shape-theoretically
significa... | [
{
"created": "Tue, 28 Nov 2017 01:04:29 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Feb 2018 14:28:43 GMT",
"version": "v2"
}
] | 2018-02-15 | [
[
"Anderson",
"Edward",
""
]
] | The program of understanding Shape Theory layer by layer topologically and geometrically -- proposed in Part I -- is now addressed for 4 points in 1-$d$. Topological shape space graphs are far more complex here, whereas metric shape spaces are (pieces of) spheres which admit an intricate shape-theoretically significant... |
1411.3854 | Helmut Friedrich | Helmut Friedrich | Geometric Asymptotics and Beyond | 34 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss some global and semi-global existence and stability results
obtained with the use of the conformal field equations.
| [
{
"created": "Fri, 14 Nov 2014 10:18:12 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Friedrich",
"Helmut",
""
]
] | We discuss some global and semi-global existence and stability results obtained with the use of the conformal field equations. |
0804.4261 | Roldao da Rocha | J. M. Hoff da Silva and Roldao da Rocha | Braneworld Remarks in Riemann-Cartan Manifolds | 7 pages. A corrected misprint in def.(18), and the respective terms
in Eqs.(20-23). All physical consequences remain unchanged | Class.Quant.Grav. 26 (2009) 055007; 26 (2009) 179801 | 10.1088/0264-9381/26/5/055007 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the projected effective Einstein equation in a 4-dimensional
arbitrary manifold embedded in a 5-dimensional Riemann-Cartan manifold. The
Israel-Darmois matching conditions are investigated, in the context where the
torsion discontinuity is orthogonal to the brane. Unexpectedly, the presence of
torsion term... | [
{
"created": "Sun, 27 Apr 2008 00:34:08 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Oct 2008 16:04:58 GMT",
"version": "v2"
},
{
"created": "Tue, 17 Feb 2009 14:03:18 GMT",
"version": "v3"
},
{
"created": "Sat, 14 Mar 2009 17:43:09 GMT",
"version": "v4"
}
] | 2009-08-17 | [
[
"da Silva",
"J. M. Hoff",
""
],
[
"da Rocha",
"Roldao",
""
]
] | We analyze the projected effective Einstein equation in a 4-dimensional arbitrary manifold embedded in a 5-dimensional Riemann-Cartan manifold. The Israel-Darmois matching conditions are investigated, in the context where the torsion discontinuity is orthogonal to the brane. Unexpectedly, the presence of torsion terms ... |
0811.2876 | Francisco Lobo | Orfeu Bertolami, Tiberiu Harko, Francisco S. N. Lobo, Jorge P\'aramos | Non-minimal curvature-matter couplings in modified gravity | 10 pages, 2 figures, contribution to the anniversary volume "The
Problems of Modern Cosmology", on the occasion of the 50th birthday of Prof.
S. D. Odintsov. Editor: Prof. P. M. Lavrov, Tomsk State Pedagogical
University | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, in the context of f(R) modified theories of gravity, it was shown
that a curvature-matter coupling induces a non-vanishing covariant derivative
of the energy-momentum, implying non-geodesic motion and, under appropriate
conditions, leading to the appearance of an extra force. We study the
implications of th... | [
{
"created": "Tue, 18 Nov 2008 10:31:23 GMT",
"version": "v1"
}
] | 2008-11-19 | [
[
"Bertolami",
"Orfeu",
""
],
[
"Harko",
"Tiberiu",
""
],
[
"Lobo",
"Francisco S. N.",
""
],
[
"Páramos",
"Jorge",
""
]
] | Recently, in the context of f(R) modified theories of gravity, it was shown that a curvature-matter coupling induces a non-vanishing covariant derivative of the energy-momentum, implying non-geodesic motion and, under appropriate conditions, leading to the appearance of an extra force. We study the implications of this... |
1108.6320 | Kayll Lake | C\'edric Grenon and Kayll Lake | Generalized Swiss-Cheese Cosmologies II: Spherical Dust | 5 pages revtex 4.1 Final form to appear in Phys. Rev. D | Phys. Rev. D 84, 083506 (2011) | 10.1103/PhysRevD.84.083506 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The generalized Swiss - cheese model, consisting of a Lema\^itre - Tolman
(inhomogeneous dust) region matched, by way of a comoving boundary surface,
onto a Robertson-Walker background of homogeneous dust, has become a standard
construction in modern cosmology. Here we ask if this construction can be made
more realis... | [
{
"created": "Wed, 31 Aug 2011 18:52:34 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Sep 2011 17:35:45 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Sep 2011 15:23:02 GMT",
"version": "v3"
}
] | 2013-05-29 | [
[
"Grenon",
"Cédric",
""
],
[
"Lake",
"Kayll",
""
]
] | The generalized Swiss - cheese model, consisting of a Lema\^itre - Tolman (inhomogeneous dust) region matched, by way of a comoving boundary surface, onto a Robertson-Walker background of homogeneous dust, has become a standard construction in modern cosmology. Here we ask if this construction can be made more realisti... |
gr-qc/0402056 | Ezra Newman | Ezra Newman | Maxwell Fields and Shear-Free Null Geodesic Congruences | 39 | Class.Quant.Grav. 21 (2004) 3197-3222 | 10.1088/0264-9381/21/13/007 | null | gr-qc | null | We study and report on the class of vacuum Maxwell fields in Minkowski space
that possess a non-degenerate, diverging, principle null vector field (null
eigenvector field of the Maxwell tensor) that is tangent to a shear-free null
geodesics congruence. These congruences can be either surface forming (the
tangent vect... | [
{
"created": "Thu, 12 Feb 2004 16:36:50 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Newman",
"Ezra",
""
]
] | We study and report on the class of vacuum Maxwell fields in Minkowski space that possess a non-degenerate, diverging, principle null vector field (null eigenvector field of the Maxwell tensor) that is tangent to a shear-free null geodesics congruence. These congruences can be either surface forming (the tangent vector... |
gr-qc/0209034 | Helmut Friedrich | Helmut Friedrich | Spin-2 fields on Minkowski space near space-like and null infinity | 18 pages | Class.Quant.Grav. 20 (2003) 101-118 | 10.1088/0264-9381/20/1/308 | null | gr-qc | null | We show that the spin-2 equations on Minkowski space in the gauge of the
`regular finite initial value problem at space-like infinity' imply estimates
which, together with the transport equations on the cylinder at space-like
infinity, allow us to obtain for a certain class of initial data information on
the behaviou... | [
{
"created": "Tue, 10 Sep 2002 11:21:34 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Friedrich",
"Helmut",
""
]
] | We show that the spin-2 equations on Minkowski space in the gauge of the `regular finite initial value problem at space-like infinity' imply estimates which, together with the transport equations on the cylinder at space-like infinity, allow us to obtain for a certain class of initial data information on the behaviour ... |
gr-qc/9709009 | Gen Uchida | Uchida Gen and Tetsuya Shiromizu | Timelike Infinity and Asymptotic Symmetry | 19 pages, LaTex, the final version to appear in J. Math. Phys | J.Math.Phys.39:6573-6592,1998 | 10.1063/1.532666 | UTAP-270, RESCEU-33/97 | gr-qc | null | By extending Ashtekar and Romano's definition of spacelike infinity to the
timelike direction, a new definition of asymptotic flatness at timelike
infinity for an isolated system with a source is proposed. The treatment
provides unit spacelike 3-hyperboloid timelike infinity and avoids the
introduction of the trouble... | [
{
"created": "Thu, 4 Sep 1997 08:08:12 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Sep 1997 05:19:03 GMT",
"version": "v2"
},
{
"created": "Sun, 11 Oct 1998 12:25:52 GMT",
"version": "v3"
}
] | 2011-07-19 | [
[
"Gen",
"Uchida",
""
],
[
"Shiromizu",
"Tetsuya",
""
]
] | By extending Ashtekar and Romano's definition of spacelike infinity to the timelike direction, a new definition of asymptotic flatness at timelike infinity for an isolated system with a source is proposed. The treatment provides unit spacelike 3-hyperboloid timelike infinity and avoids the introduction of the troubleso... |
1710.00830 | Miguel Ferreira | Miguel C. Ferreira, Caio F. B. Macedo, Vitor Cardoso | Orbital fingerprints of ultralight scalar fields around black holes | 21 pages, 13 figures. Accepted for publication in Physical Review D,
comments are welcome | null | 10.1103/PhysRevD.96.083017 | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Ultralight scalars have been predicted in a variety of scenarios, and
advocated as a possible component of dark matter. These fields can form compact
regular structures known as boson stars, or---in the presence of
horizons---give rise to nontrivial time-dependent scalar hair and a stationary
geometry. Because these ... | [
{
"created": "Mon, 2 Oct 2017 18:00:04 GMT",
"version": "v1"
}
] | 2017-11-22 | [
[
"Ferreira",
"Miguel C.",
""
],
[
"Macedo",
"Caio F. B.",
""
],
[
"Cardoso",
"Vitor",
""
]
] | Ultralight scalars have been predicted in a variety of scenarios, and advocated as a possible component of dark matter. These fields can form compact regular structures known as boson stars, or---in the presence of horizons---give rise to nontrivial time-dependent scalar hair and a stationary geometry. Because these fi... |
1410.3215 | Carl Kent | Carl Kent, Elizabeth Winstanley | The global rotating scalar field vacuum on anti-de Sitter space-time | Minor changes (inc. title change), version accepted for publication
in Physics Letters B, 4 pages | Phys. Lett. B 740 (2015) 188 - 191 | 10.1016/j.physletb.2014.11.047 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the definition of the global vacuum state of a quantum scalar
field on $n$-dimensional anti-de Sitter space-time as seen by an observer
rotating about the polar axis. Since positive (or negative) frequency scalar
field modes must have positive (or negative) Klein-Gordon norm respectively, we
find that the... | [
{
"created": "Mon, 13 Oct 2014 08:26:25 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Dec 2014 08:58:14 GMT",
"version": "v2"
}
] | 2015-03-16 | [
[
"Kent",
"Carl",
""
],
[
"Winstanley",
"Elizabeth",
""
]
] | We consider the definition of the global vacuum state of a quantum scalar field on $n$-dimensional anti-de Sitter space-time as seen by an observer rotating about the polar axis. Since positive (or negative) frequency scalar field modes must have positive (or negative) Klein-Gordon norm respectively, we find that the o... |
gr-qc/0008001 | Hod Shahar | Shahar Hod | Wave Propagation in Nontrivial Backgrounds | 5 pages. 2 Figures | Class.Quant.Grav. 18 (2001) 1311-1318 | 10.1088/0264-9381/18/7/313 | null | gr-qc | null | It is well known that waves propagating in a nontrivial medium develop
``tails''. However, the exact form of the late-time tail has so far been
determined only for a narrow class of models. We present a systematic analysis
of the tail phenomenon for waves propagating under the influence of a {\it
general} scattering ... | [
{
"created": "Tue, 1 Aug 2000 06:42:20 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Hod",
"Shahar",
""
]
] | It is well known that waves propagating in a nontrivial medium develop ``tails''. However, the exact form of the late-time tail has so far been determined only for a narrow class of models. We present a systematic analysis of the tail phenomenon for waves propagating under the influence of a {\it general} scattering po... |
gr-qc/0505076 | Matthew Pitkin | Matthew Pitkin (for the LIGO Scientific Collaboration) | Searching for gravitational waves from known pulsars | Accepted by CQG for the proceeding of GWDAW9, 7 pages, 2 figures | Class.Quant.Grav. 22 (2005) S1277-S1282 | 10.1088/0264-9381/22/18/S41 | null | gr-qc astro-ph | null | We present upper limits on the amplitude of gravitational waves from 28
isolated pulsars using data from the second science run of LIGO. The results
are also expressed as a constraint on the pulsars' equatorial ellipticities. We
discuss a new way of presenting such ellipticity upper limits that takes
account of the u... | [
{
"created": "Mon, 16 May 2005 11:42:51 GMT",
"version": "v1"
}
] | 2019-08-14 | [
[
"Pitkin",
"Matthew",
"",
"for the LIGO Scientific Collaboration"
]
] | We present upper limits on the amplitude of gravitational waves from 28 isolated pulsars using data from the second science run of LIGO. The results are also expressed as a constraint on the pulsars' equatorial ellipticities. We discuss a new way of presenting such ellipticity upper limits that takes account of the unc... |
gr-qc/0505154 | Ding-Fang Zeng | Ding-fang Zeng and Yi-hong Gao | An Ignored Assumption of $\Lambda$CDM Cosmology and An Old Question: Do
We Live On The "Center" of The Universe? | two column style, 4 pages | null | null | null | gr-qc | null | We point out that $\Lambda$CDM cosmology has an ignored assumption. That is,
the $\Lambda$ component of the universe moves synchronously with ordinary
matters on Hubble scales. If cosmological constant is vacuum energy, this
assumption may be very difficult to be understood.
We then propose a new mechanism which ca... | [
{
"created": "Tue, 31 May 2005 11:25:01 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Zeng",
"Ding-fang",
""
],
[
"Gao",
"Yi-hong",
""
]
] | We point out that $\Lambda$CDM cosmology has an ignored assumption. That is, the $\Lambda$ component of the universe moves synchronously with ordinary matters on Hubble scales. If cosmological constant is vacuum energy, this assumption may be very difficult to be understood. We then propose a new mechanism which can ex... |
gr-qc/0510008 | Lior M. Burko | Alexander Z. Smith and Lior M. Burko | Comment on "High-order contamination in the tail of gravitational
collapse'' | 4 pages, 4 figures | Phys.Rev. D74 (2006) 028501 | 10.1103/PhysRevD.74.028501 | null | gr-qc | null | We confront the predictions of S. Hod, Phys. Rev. D 60, 104053 (1999) for the
late-time decay rate of black hole perturbations with numerical data.
Specifically, we ask two questions: First, are corrections to the Price tail
dominated by logarithmic terms, as predicted by Hod? Second, if there were
logarithmic correc... | [
{
"created": "Mon, 3 Oct 2005 16:40:34 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Jun 2006 22:06:06 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Jul 2006 18:12:22 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Smith",
"Alexander Z.",
""
],
[
"Burko",
"Lior M.",
""
]
] | We confront the predictions of S. Hod, Phys. Rev. D 60, 104053 (1999) for the late-time decay rate of black hole perturbations with numerical data. Specifically, we ask two questions: First, are corrections to the Price tail dominated by logarithmic terms, as predicted by Hod? Second, if there were logarithmic correcti... |
1207.0708 | M. Farasat Shamir | M. Farasat Shamir, Adil Jhangeer, Akhlaq Ahmad Bhatti | Exact Solutions of Bianchi Types $I$ and $V$ Models in $f(R,T)$ Gravity | 16 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is devoted to investigate the exact solutions of Bianchi types I
and V spacetimes in the context of f(R, T) gravity [1]. For this purpose, we
found two exact solutions in each case by using assumption of constant
deceleration parameter and the variation law of Hubble parameter. The obtained
solutions corre... | [
{
"created": "Mon, 2 Jul 2012 11:11:36 GMT",
"version": "v1"
}
] | 2012-07-04 | [
[
"Shamir",
"M. Farasat",
""
],
[
"Jhangeer",
"Adil",
""
],
[
"Bhatti",
"Akhlaq Ahmad",
""
]
] | This paper is devoted to investigate the exact solutions of Bianchi types I and V spacetimes in the context of f(R, T) gravity [1]. For this purpose, we found two exact solutions in each case by using assumption of constant deceleration parameter and the variation law of Hubble parameter. The obtained solutions corresp... |
0806.1391 | Farook Rahaman | F.Rahaman, M.Kalam and K A Rahman | Thin shell wormhole due to dyadosphere of a charged black hole | 10 pages, 2 figures. Accepted in Mod.Phys.Lett.A | Mod.Phys.Lett.A24:53-61,2009 | 10.1142/S0217732309027406 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To explain Gamma Ray Bursts, Ruffini argued that the event horizon of a
charged black hole is surrounded by a special region called, the Dyadosphere
where electric field exceeds the critical value for $e^+$ $e^-$ pair
production. In the present work, we construct a thin shell wormhole by
performing a thought surgery ... | [
{
"created": "Mon, 9 Jun 2008 08:05:48 GMT",
"version": "v1"
}
] | 2009-02-10 | [
[
"Rahaman",
"F.",
""
],
[
"Kalam",
"M.",
""
],
[
"Rahman",
"K A",
""
]
] | To explain Gamma Ray Bursts, Ruffini argued that the event horizon of a charged black hole is surrounded by a special region called, the Dyadosphere where electric field exceeds the critical value for $e^+$ $e^-$ pair production. In the present work, we construct a thin shell wormhole by performing a thought surgery be... |
2311.10369 | Z. Yousaf | Z. Yousaf, Kazuharu Bamba, M. Z. Bhatti, U. Farwa | Quasi-static evolution of axially and reflection symmetric large-scale
configuration | 43 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review recently offered notions of quasi-static evolution of the axial
self-gravitating structures at large-scales and the criteria to characterize
the corresponding evolutionary aspects under the influence of strong curvature
regimes. In doing so, we examine the axial source's dynamic and quasi-static
behavior wi... | [
{
"created": "Fri, 17 Nov 2023 07:46:08 GMT",
"version": "v1"
}
] | 2023-12-05 | [
[
"Yousaf",
"Z.",
""
],
[
"Bamba",
"Kazuharu",
""
],
[
"Bhatti",
"M. Z.",
""
],
[
"Farwa",
"U.",
""
]
] | We review recently offered notions of quasi-static evolution of the axial self-gravitating structures at large-scales and the criteria to characterize the corresponding evolutionary aspects under the influence of strong curvature regimes. In doing so, we examine the axial source's dynamic and quasi-static behavior with... |
1301.6344 | Emilio Elizalde | A. V. Astashenok, E. Elizalde, J. de Haro, S. D. Odintsov, A. V. Yurov | Brane cosmology from observational surveys and its comparison with
standard FRW cosmology | 19 pages, 6 figures. arXiv admin note: text overlap with
arXiv:1206.2192 | null | 10.1007/s10509-013-1484-4 | null | gr-qc astro-ph.CO hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several dark energy models on the brane are investigated. They are compared
with corresponding theories in the frame of 4d Friedmann-Robertson-Walker
cosmology. To constrain the parameters of the models considered, recent
observational data, including SNIa apparent magnitude measurements, baryon
acoustic oscillation ... | [
{
"created": "Sun, 27 Jan 2013 11:01:26 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Astashenok",
"A. V.",
""
],
[
"Elizalde",
"E.",
""
],
[
"de Haro",
"J.",
""
],
[
"Odintsov",
"S. D.",
""
],
[
"Yurov",
"A. V.",
""
]
] | Several dark energy models on the brane are investigated. They are compared with corresponding theories in the frame of 4d Friedmann-Robertson-Walker cosmology. To constrain the parameters of the models considered, recent observational data, including SNIa apparent magnitude measurements, baryon acoustic oscillation re... |
1205.4466 | Richard Woodard | P. J. Mora (U. Florida), N. C. Tsamis (U. Crete) and R. P. Woodard (U.
Florida) | Weyl-Weyl Correlator in de Donder Gauge on de Sitter | 16 pages, no figures, uses LaTeX2e | null | 10.1103/PhysRevD.86.084016 | UFIFT-QG-12-04 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the linearized Weyl-Weyl correlator using a new solution for the
graviton propagator on de Sitter background in de Donder gauge. The result
agrees exactly with a previous computation in a noncovariant gauge. We also use
dimensional regularization to compute the one loop expectation value of the
square of t... | [
{
"created": "Sun, 20 May 2012 22:13:49 GMT",
"version": "v1"
}
] | 2015-06-05 | [
[
"Mora",
"P. J.",
"",
"U. Florida"
],
[
"Tsamis",
"N. C.",
"",
"U. Crete"
],
[
"Woodard",
"R. P.",
"",
"U.\n Florida"
]
] | We compute the linearized Weyl-Weyl correlator using a new solution for the graviton propagator on de Sitter background in de Donder gauge. The result agrees exactly with a previous computation in a noncovariant gauge. We also use dimensional regularization to compute the one loop expectation value of the square of the... |
gr-qc/0002053 | Luca Bombelli | Luca Bombelli | Statistical Lorentzian geometry and the closeness of Lorentzian
manifolds | Plain TeX, 19 pages + 3 figures, revised version for publication in
J.Math.Phys., significantly improved content | J.Math.Phys. 41 (2000) 6944-6958 | 10.1063/1.1288494 | null | gr-qc math-ph math.DG math.MP | null | I introduce a family of closeness functions between causal Lorentzian
geometries of finite volume and arbitrary underlying topology. When points are
randomly scattered in a Lorentzian manifold, with uniform density according to
the volume element, some information on the topology and metric is encoded in
the partial ... | [
{
"created": "Tue, 15 Feb 2000 18:35:07 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Jun 2000 22:41:49 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Bombelli",
"Luca",
""
]
] | I introduce a family of closeness functions between causal Lorentzian geometries of finite volume and arbitrary underlying topology. When points are randomly scattered in a Lorentzian manifold, with uniform density according to the volume element, some information on the topology and metric is encoded in the partial or... |
2201.00047 | Jahed Abedi | Jahed Abedi, Lu\'is Felipe Longo Micchi, Niayesh Afshordi | GW190521: Search for Echoes due to Stimulated Hawking Radiation from
Black Holes | 17 pages, 13 figures, 3 tables, Codes available at
https://github.com/No-GAP/GW190521echo | null | 10.1103/PhysRevD.108.044047 | null | gr-qc astro-ph.CO astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Being arguably the most massive binary black hole merger event observed to
date, GW190521 deserves special attention. The exceptionally loud ringdown of
this merger makes it an ideal candidate to search for gravitational wave
echoes, a proposed smoking gun for the quantum structure of black hole
horizons. We perform ... | [
{
"created": "Fri, 31 Dec 2021 20:12:38 GMT",
"version": "v1"
},
{
"created": "Mon, 29 May 2023 14:27:42 GMT",
"version": "v2"
}
] | 2023-10-09 | [
[
"Abedi",
"Jahed",
""
],
[
"Micchi",
"Luís Felipe Longo",
""
],
[
"Afshordi",
"Niayesh",
""
]
] | Being arguably the most massive binary black hole merger event observed to date, GW190521 deserves special attention. The exceptionally loud ringdown of this merger makes it an ideal candidate to search for gravitational wave echoes, a proposed smoking gun for the quantum structure of black hole horizons. We perform an... |
gr-qc/0610099 | Pui Tang Leung | L.K. Tsui, P.T. Leung and J. Wu | Determination of the internal structure of neutron stars from
gravitational wave spectra | 26 pages, 14 figures, submitted to Physical Review D | Phys.Rev.D74:124025,2006 | 10.1103/PhysRevD.74.124025 | null | gr-qc | null | In this paper the internal structure of a neutron star is shown to be
inferrable from its gravitational-wave spectrum. Iteratively applying the
inverse scheme of the scaled coordinate logarithmic perturbation method for
neutron stars proposed by Tsui and Leung [Astrophys. J. {\bf 631}, 495 (2005)],
we are able to det... | [
{
"created": "Fri, 20 Oct 2006 07:36:54 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Tsui",
"L. K.",
""
],
[
"Leung",
"P. T.",
""
],
[
"Wu",
"J.",
""
]
] | In this paper the internal structure of a neutron star is shown to be inferrable from its gravitational-wave spectrum. Iteratively applying the inverse scheme of the scaled coordinate logarithmic perturbation method for neutron stars proposed by Tsui and Leung [Astrophys. J. {\bf 631}, 495 (2005)], we are able to deter... |
1307.1923 | Edward Anderson | Edward Anderson | Kendall's Shape Statistics as a Classical Realization of Barbour-type
Timeless Records Theory approach to Quantum Gravity | 11 pages with 5 figures. Improved text, as Accepted by SHPMP (Studies
in History and Philosophy of Modern Physics) with some new explanations,
minor corrections and updated references | Stud. Hist. Phil. Mod. Phys. 51 (2015) 1-8 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I previously showed that Kendall's work on shape geometry is in fact also the
geometrical description of Barbour's relational mechanics' reduced
configuration spaces (alias shape spaces). I now describe the extent to which
Kendall's subsequent statistical application to e.g. the `standing stones
problem' realizes fur... | [
{
"created": "Sun, 7 Jul 2013 21:42:15 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Jul 2013 18:54:37 GMT",
"version": "v2"
},
{
"created": "Wed, 7 Aug 2013 14:06:48 GMT",
"version": "v3"
},
{
"created": "Mon, 25 Nov 2013 02:22:31 GMT",
"version": "v4"
},
{
"cre... | 2015-08-07 | [
[
"Anderson",
"Edward",
""
]
] | I previously showed that Kendall's work on shape geometry is in fact also the geometrical description of Barbour's relational mechanics' reduced configuration spaces (alias shape spaces). I now describe the extent to which Kendall's subsequent statistical application to e.g. the `standing stones problem' realizes furth... |
2211.12780 | Antonio C. Guti\'errez-Pi\~neres | Antonio C. Guti\'errez-Pi\~neres | Fermi-normal coordinates for the Newtonian approximation of gravity | Replaced with the version matching the published one in Physica
Scripta | null | 10.1088/1402-4896/ad0fc7 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this work, we compute the metric corresponding to a static and spherically
symmetric mass distribution in the general relativistic weak field
approximation to quadratic order in Fermi-normal coordinates surrounding a
radial geodesic. To construct a geodesic and a convenient tetrad transported
along it, we first in... | [
{
"created": "Wed, 23 Nov 2022 08:49:42 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Dec 2022 20:41:14 GMT",
"version": "v2"
},
{
"created": "Sat, 25 Nov 2023 15:07:57 GMT",
"version": "v3"
}
] | 2023-11-28 | [
[
"Gutiérrez-Piñeres",
"Antonio C.",
""
]
] | In this work, we compute the metric corresponding to a static and spherically symmetric mass distribution in the general relativistic weak field approximation to quadratic order in Fermi-normal coordinates surrounding a radial geodesic. To construct a geodesic and a convenient tetrad transported along it, we first intr... |
1004.2539 | Matt Visser | Jozef Skakala (Victoria University of Wellington) and Matt Visser
(Victoria University of Wellington) | Semi-analytic results for quasi-normal frequencies | V1: 28 pages, no figures. V2: 3 references added, no physics changes.
V3: 29 pages, 9 references added, no physics changes; V4: reformatted, now 27
pages. Some clarifications, comparison with results obtained by monodromy
techniques. This version accepted for publication in JHEP. V5: Minor typos
fixed. Compatib... | JHEP 1008:061,2010 | 10.1007/JHEP08(2010)061 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The last decade has seen considerable interest in the quasi-normal
frequencies [QNFs] of black holes (and even wormholes), both asymptotically
flat and with cosmological horizons. There is wide agreement that the QNFs are
often of the form omega_n = (offset) + i n (gap), though some authors have
encountered situation... | [
{
"created": "Thu, 15 Apr 2010 02:11:35 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Apr 2010 03:35:59 GMT",
"version": "v2"
},
{
"created": "Fri, 30 Apr 2010 03:19:27 GMT",
"version": "v3"
},
{
"created": "Thu, 22 Jul 2010 12:17:13 GMT",
"version": "v4"
},
{
"c... | 2010-09-02 | [
[
"Skakala",
"Jozef",
"",
"Victoria University of Wellington"
],
[
"Visser",
"Matt",
"",
"Victoria University of Wellington"
]
] | The last decade has seen considerable interest in the quasi-normal frequencies [QNFs] of black holes (and even wormholes), both asymptotically flat and with cosmological horizons. There is wide agreement that the QNFs are often of the form omega_n = (offset) + i n (gap), though some authors have encountered situations ... |
2001.06830 | Vasilis Oikonomou | S.D. Odintsov, V.K. Oikonomou | Geometric Inflation and Dark Energy with Axion $F(R)$ Gravity | PRD Accepted | null | 10.1103/PhysRevD.101.044009 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a model of $F(R)$ gravity in the presence of a string theory
motivated misalignment axion like particle materialized in terms of a canonical
scalar field minimally coupled with gravity, and we study the cosmological
phenomenology of the model, emphasizing mainly on the late-time era. The main
result of the... | [
{
"created": "Sun, 19 Jan 2020 13:59:51 GMT",
"version": "v1"
}
] | 2020-02-19 | [
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K.",
""
]
] | We present a model of $F(R)$ gravity in the presence of a string theory motivated misalignment axion like particle materialized in terms of a canonical scalar field minimally coupled with gravity, and we study the cosmological phenomenology of the model, emphasizing mainly on the late-time era. The main result of the p... |
1011.2779 | Gianluca Calcagni | Martin Bojowald, Gianluca Calcagni | Inflationary observables in loop quantum cosmology | 41 pages; v2: minor typos corrected, summary of results added | JCAP 1103:032,2011 | 10.1088/1475-7516/2011/03/032 | AEI-2010-161, IGC-10/11-1 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The full set of cosmological observables coming from linear scalar and tensor
perturbations of loop quantum cosmology is computed in the presence of
inverse-volume corrections. Background inflationary solutions are found at
linear order in the quantum corrections; depending on the values of
quantization parameters, t... | [
{
"created": "Thu, 11 Nov 2010 21:39:13 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Mar 2011 15:24:23 GMT",
"version": "v2"
}
] | 2011-03-28 | [
[
"Bojowald",
"Martin",
""
],
[
"Calcagni",
"Gianluca",
""
]
] | The full set of cosmological observables coming from linear scalar and tensor perturbations of loop quantum cosmology is computed in the presence of inverse-volume corrections. Background inflationary solutions are found at linear order in the quantum corrections; depending on the values of quantization parameters, the... |
1811.00814 | Johannes Lumma | Astrid Eichhorn, Tim Koslowski, Johannes Lumma, Antonio D. Pereira | Towards background independent quantum gravity with tensor models | 23 pages plus appendix and references | Class. Quantum Grav. 36 155007 (2019) | 10.1088/1361-6382/ab2545 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore whether the phase diagram of tensor models could feature a
pregeometric, discrete and a geometric, continuum phase for the building blocks
of space. The latter are associated to rank $d$ tensors of size $N$. We search
for a universal large $N$ scaling limit in a rank-3 model with real tensors
that could be... | [
{
"created": "Fri, 2 Nov 2018 10:54:48 GMT",
"version": "v1"
}
] | 2020-10-07 | [
[
"Eichhorn",
"Astrid",
""
],
[
"Koslowski",
"Tim",
""
],
[
"Lumma",
"Johannes",
""
],
[
"Pereira",
"Antonio D.",
""
]
] | We explore whether the phase diagram of tensor models could feature a pregeometric, discrete and a geometric, continuum phase for the building blocks of space. The latter are associated to rank $d$ tensors of size $N$. We search for a universal large $N$ scaling limit in a rank-3 model with real tensors that could be l... |
1311.0206 | Mariafelicia De Laurentis Dr. | Mariafelicia De Laurentis, Antonio Jesus Lopez-Revelles | Newtonian, Post Newtonian and Parameterized Post Newtonian limits of
f(R, G) gravity | 26 pages | International Journal of Geometric Methods in Modern Physics Vol.
11, No. 10, 1450082 (2014) | 10.1142/S0219887814500820 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss in detail the weak field limit of f(R,G) gravity taking into
account analytic functions of the Ricci scalar R and the Gauss-Bonnet invariant
G. Specifically, we develop, in metric formalism, the Newtonian, Post Newtonian
and Parameterized Post Newtonian limits starting from general f(R, G)
Lagrangian. The ... | [
{
"created": "Fri, 1 Nov 2013 15:20:57 GMT",
"version": "v1"
}
] | 2014-11-13 | [
[
"De Laurentis",
"Mariafelicia",
""
],
[
"Lopez-Revelles",
"Antonio Jesus",
""
]
] | We discuss in detail the weak field limit of f(R,G) gravity taking into account analytic functions of the Ricci scalar R and the Gauss-Bonnet invariant G. Specifically, we develop, in metric formalism, the Newtonian, Post Newtonian and Parameterized Post Newtonian limits starting from general f(R, G) Lagrangian. The sp... |
1112.1005 | Patrick Nash Dr. | Patrick L. Nash | Spinor-Unit Field Representation of Electromagnetism Applied to a Model
Inflationary Cosmology | replaced by "Possible consistent extra time dimensions in the early
universe," http://arxiv.org/abs/1310.0697 | General Relativity and Gravitation, 2012, DOI:
10.1007/s10714-012-1380-1 | 10.1007/s10714-012-1380-1 | null | gr-qc astro-ph.CO hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The new spinor-unit field representation of the electromagnetism
\cite{Nash2010} (with quark and lepton sources) is integrated via minimal
coupling with standard Einstein gravitation, to formulate a Lagrangian model of
the very early universe. The solution of the coupled Euler-Lagrange field
equations yields a scale ... | [
{
"created": "Mon, 5 Dec 2011 17:14:23 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Feb 2012 15:03:06 GMT",
"version": "v2"
},
{
"created": "Tue, 27 Mar 2012 12:27:41 GMT",
"version": "v3"
},
{
"created": "Tue, 14 Apr 2015 16:58:28 GMT",
"version": "v4"
}
] | 2015-04-15 | [
[
"Nash",
"Patrick L.",
""
]
] | The new spinor-unit field representation of the electromagnetism \cite{Nash2010} (with quark and lepton sources) is integrated via minimal coupling with standard Einstein gravitation, to formulate a Lagrangian model of the very early universe. The solution of the coupled Euler-Lagrange field equations yields a scale fa... |
2003.02018 | Ebrahim Yusofi Ramneti | A. R. Ziyaee, M. Mohsenzadeh and E. Yusofi | A Covariant Approach for Particle Creation in Non-flat Background | 10 pages, 4 figures, Statements of introduction, abstract and results
were corrected | null | 10.1007/s10773-020-04649-0 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Krein approach is used to study the particle creation during quasi-de Sitter
inflation in different background space-times. In the conventional method for
calculating the created particles spectrum, the background space-time is
automatically considered flat. Selecting a flat background poses two
fundamental problems:... | [
{
"created": "Wed, 4 Mar 2020 11:53:17 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Mar 2020 09:49:25 GMT",
"version": "v2"
}
] | 2020-12-02 | [
[
"Ziyaee",
"A. R.",
""
],
[
"Mohsenzadeh",
"M.",
""
],
[
"Yusofi",
"E.",
""
]
] | Krein approach is used to study the particle creation during quasi-de Sitter inflation in different background space-times. In the conventional method for calculating the created particles spectrum, the background space-time is automatically considered flat. Selecting a flat background poses two fundamental problems: F... |
gr-qc/9411031 | Steve Carlip | S. Carlip and J.E. Nelson | Comparative Quantizations of (2+1)-Dimensional Gravity | 24 pages, LaTeX, no figures | Phys.Rev.D51:5643-5653,1995 | 10.1103/PhysRevD.51.5643 | UCD-94-37 and DFTT/49/94 | gr-qc hep-th | null | We compare three approaches to the quantization of (2+1)-dimensional gravity
with a negative cosmological constant: reduced phase space quantization with
the York time slicing, quantization of the algebra of holonomies, and
quantization of the space of classical solutions. The relationships among these
quantum theori... | [
{
"created": "Sat, 12 Nov 1994 02:18:41 GMT",
"version": "v1"
}
] | 2010-04-28 | [
[
"Carlip",
"S.",
""
],
[
"Nelson",
"J. E.",
""
]
] | We compare three approaches to the quantization of (2+1)-dimensional gravity with a negative cosmological constant: reduced phase space quantization with the York time slicing, quantization of the algebra of holonomies, and quantization of the space of classical solutions. The relationships among these quantum theories... |
1308.3100 | Lydia Bieri | Lydia Bieri, David Garfinkle | Neutrino Radiation Showing a Christodoulou Memory Effect in General
Relativity | 35 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe neutrino radiation in general relativity by introducing the
energy-momentum tensor of a null fluid into the Einstein equations.
Investigating the geometry and analysis at null infinity, we prove that a
component of the null fluid enlarges the Christodoulou memory effect of
gravitational waves. The descrip... | [
{
"created": "Wed, 14 Aug 2013 12:17:32 GMT",
"version": "v1"
}
] | 2013-08-15 | [
[
"Bieri",
"Lydia",
""
],
[
"Garfinkle",
"David",
""
]
] | We describe neutrino radiation in general relativity by introducing the energy-momentum tensor of a null fluid into the Einstein equations. Investigating the geometry and analysis at null infinity, we prove that a component of the null fluid enlarges the Christodoulou memory effect of gravitational waves. The descripti... |
gr-qc/0401032 | M. D. Maia | M. D. Maia | Brane-worlds and Cosmology | Essay in honor of Mario Novello, 8 pages, latex. Typo corrected | Inquiring the Universe. Frontiers Group, (2003) J.M. Salim,
S.P.Bergliaffa, L.A. Oliveira and V. De Lorenci (editors) | null | null | gr-qc | null | The Friedmann equation for a FRW-brane-world in a flat bulk is derived and
applied to the accelerated expansion of the universe.
| [
{
"created": "Fri, 9 Jan 2004 16:32:28 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Mar 2004 15:39:41 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Maia",
"M. D.",
""
]
] | The Friedmann equation for a FRW-brane-world in a flat bulk is derived and applied to the accelerated expansion of the universe. |
1003.3102 | Hyeong-Chan Kim | Bogeun Gwak, Bum-Hoon Lee, Wonwoo Lee, and Hyeong-Chan Kim | Geodesic motions in extraordinary string geometry | 15 pages, 11 figures | null | 10.1007/s10714-011-1183-9 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The geodesic properties of the extraordinary vacuum string solution in (4+1)
dimensions are analyzed by using Hamilton-Jacobi method. The geodesic motions
show distinct properties from those of the static one. Especially, any freely
falling particle can not arrive at the horizon or singularity. There exist
stable nul... | [
{
"created": "Tue, 16 Mar 2010 08:39:35 GMT",
"version": "v1"
},
{
"created": "Mon, 31 May 2010 12:22:06 GMT",
"version": "v2"
}
] | 2015-05-18 | [
[
"Gwak",
"Bogeun",
""
],
[
"Lee",
"Bum-Hoon",
""
],
[
"Lee",
"Wonwoo",
""
],
[
"Kim",
"Hyeong-Chan",
""
]
] | The geodesic properties of the extraordinary vacuum string solution in (4+1) dimensions are analyzed by using Hamilton-Jacobi method. The geodesic motions show distinct properties from those of the static one. Especially, any freely falling particle can not arrive at the horizon or singularity. There exist stable null ... |
gr-qc/9901056 | Luis Lehner | N.T. Bishop, R. Gomez, L. Lehner, M. Maharaj and J. Winicour | The incorporation of matter into characteristic numerical relativity | 15 pages + 4 (eps) figures | Phys.Rev.D60:024005,1999 | 10.1103/PhysRevD.60.024005 | null | gr-qc | null | A code that implements Einstein equations in the characteristic formulation
in 3D has been developed and thoroughly tested for the vacuum case. Here, we
describe how to incorporate matter, in the form of a perfect fluid, into the
code. The extended code has been written and validated in a number of cases. It
is stabl... | [
{
"created": "Wed, 20 Jan 1999 22:46:37 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bishop",
"N. T.",
""
],
[
"Gomez",
"R.",
""
],
[
"Lehner",
"L.",
""
],
[
"Maharaj",
"M.",
""
],
[
"Winicour",
"J.",
""
]
] | A code that implements Einstein equations in the characteristic formulation in 3D has been developed and thoroughly tested for the vacuum case. Here, we describe how to incorporate matter, in the form of a perfect fluid, into the code. The extended code has been written and validated in a number of cases. It is stable ... |
1405.2402 | Sunil Maharaj | Y. Nyonyi, S. D. Maharaj, K. S. Govinder | Higher dimensional charged shear-free relativistic models with heat flux | 21 pages, submitted for publication | Eur. Phys. J. C 74, 2952 (2014) | 10.1140/epjc/s10052-014-2952-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse shear-free spherically symmetric relativistic models of
gravitating fluids with heat flow and electric charge defined on higher
dimensional manifolds. The solution to the Einstein-Maxwell system is governed
by the pressure isotropy condition which depends on the spacetime dimension. We
study this highly no... | [
{
"created": "Sat, 10 May 2014 07:10:22 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Nyonyi",
"Y.",
""
],
[
"Maharaj",
"S. D.",
""
],
[
"Govinder",
"K. S.",
""
]
] | We analyse shear-free spherically symmetric relativistic models of gravitating fluids with heat flow and electric charge defined on higher dimensional manifolds. The solution to the Einstein-Maxwell system is governed by the pressure isotropy condition which depends on the spacetime dimension. We study this highly nonl... |
2310.10718 | Boris Goncharov | Boris Goncharov, Laura Donnay, Jan Harms | Inferring fundamental spacetime symmetries with gravitational-wave
memory: from LISA to the Einstein Telescope | 13 pages, 6 figures, 1 table | null | 10.1103/PhysRevLett.132.241401 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We revisit gravitational wave (GW) memory as the key to measuring spacetime
symmetries, extending beyond its traditional role in GW searches. In
particular, we show how these symmetries may be probed via displacement and
spin memory observations, respectively. We further find that the Einstein
Telescope's (ET) sensit... | [
{
"created": "Mon, 16 Oct 2023 18:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 9 May 2024 16:34:25 GMT",
"version": "v2"
}
] | 2024-06-17 | [
[
"Goncharov",
"Boris",
""
],
[
"Donnay",
"Laura",
""
],
[
"Harms",
"Jan",
""
]
] | We revisit gravitational wave (GW) memory as the key to measuring spacetime symmetries, extending beyond its traditional role in GW searches. In particular, we show how these symmetries may be probed via displacement and spin memory observations, respectively. We further find that the Einstein Telescope's (ET) sensitiv... |
1912.03471 | Natalia Konobeeva | Natalia N. Konobeeva and Mikhail B. Belonenko | Zitterbewegung in the vicinity of the Chern-Simons black hole | 8 pages, 4 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider zitterbewegung (ZB) effect in four and five-dimensional space in
the vicinity of the Chern-Simons black hole with torsion. The metric is taken
in the traditional spherically symmetric form. We consider the equation for the
current in the framework of the Schr\"odinger representation. Dependences of
the el... | [
{
"created": "Sat, 7 Dec 2019 09:14:51 GMT",
"version": "v1"
}
] | 2019-12-10 | [
[
"Konobeeva",
"Natalia N.",
""
],
[
"Belonenko",
"Mikhail B.",
""
]
] | We consider zitterbewegung (ZB) effect in four and five-dimensional space in the vicinity of the Chern-Simons black hole with torsion. The metric is taken in the traditional spherically symmetric form. We consider the equation for the current in the framework of the Schr\"odinger representation. Dependences of the elec... |
1610.01453 | Vasilis Oikonomou | V.K. Oikonomou, Supriya Pan, Rafael C. Nunes | Gravitational Baryogenesis in Running Vacuum models | 9 pages, IJMPA Accepted | null | 10.1142/S0217751X17501299 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the gravitational baryogenesis mechanism for generating baryon
asymmetry in the context of running vacuum models. Regardless if these models
can produce a viable cosmological evolution, we demonstrate that they produce a
non-zero baryon-to-entropy ratio even if the universe is filled with conformal
matter. T... | [
{
"created": "Wed, 5 Oct 2016 14:41:22 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Jul 2017 22:45:57 GMT",
"version": "v2"
}
] | 2017-09-06 | [
[
"Oikonomou",
"V. K.",
""
],
[
"Pan",
"Supriya",
""
],
[
"Nunes",
"Rafael C.",
""
]
] | We study the gravitational baryogenesis mechanism for generating baryon asymmetry in the context of running vacuum models. Regardless if these models can produce a viable cosmological evolution, we demonstrate that they produce a non-zero baryon-to-entropy ratio even if the universe is filled with conformal matter. Thi... |
2009.06518 | Krzysztof Andrzejewski | K. Andrzejewski, P. Kosinski | Global propagation of massive quantum fields in the plane gravitational
waves and electromagnetic backgrounds | 29 pages, version accepted for publication in CQG (title modified and
some explanations added) | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The behavior of massive quantum fields in the general plane wave spacetime
and external, non-plane, electromagnetic waves is studied. The asymptotic
conditions, the "in" ("out") states and the cross sections are analysed. It is
observed that, despite of the singularities encountered, the global form of
these states c... | [
{
"created": "Mon, 14 Sep 2020 15:27:10 GMT",
"version": "v1"
},
{
"created": "Wed, 19 May 2021 14:56:14 GMT",
"version": "v2"
},
{
"created": "Thu, 16 Dec 2021 14:30:58 GMT",
"version": "v3"
}
] | 2021-12-17 | [
[
"Andrzejewski",
"K.",
""
],
[
"Kosinski",
"P.",
""
]
] | The behavior of massive quantum fields in the general plane wave spacetime and external, non-plane, electromagnetic waves is studied. The asymptotic conditions, the "in" ("out") states and the cross sections are analysed. It is observed that, despite of the singularities encountered, the global form of these states can... |
1003.5352 | Tao Mei | T. Mei | General Relativity as a fully singular Lagrange system | 25 pages, no figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present some gauge conditions to eliminate all second time derivative
terms in the vierbein forms of the ten Einstein equations of general
relativity; at the same time, we present the corresponding Lagrangian in which
there is not any quadratic term of first time derivative that can leads to
those vierbein forms o... | [
{
"created": "Sun, 28 Mar 2010 08:51:11 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Oct 2010 01:59:54 GMT",
"version": "v2"
}
] | 2010-10-28 | [
[
"Mei",
"T.",
""
]
] | We present some gauge conditions to eliminate all second time derivative terms in the vierbein forms of the ten Einstein equations of general relativity; at the same time, we present the corresponding Lagrangian in which there is not any quadratic term of first time derivative that can leads to those vierbein forms of ... |
1504.04108 | Sanjay Jhingan | Remya Nair, Sanjay Jhingan, Takahiro Tanaka | Synergy between ground and space based gravitational wave detectors for
estimation of binary coalescence parameters | 12 pages, 9 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the advantage of the co-existence of future ground and space based
gravitational wave detectors, in estimating the parameters of a binary
coalescence. Using the post-Newtonian waveform for the inspiral of non-spinning
neutron star-black hole pairs in circular orbits, we study how the estimates
for chirp mass... | [
{
"created": "Thu, 16 Apr 2015 06:58:21 GMT",
"version": "v1"
}
] | 2015-04-17 | [
[
"Nair",
"Remya",
""
],
[
"Jhingan",
"Sanjay",
""
],
[
"Tanaka",
"Takahiro",
""
]
] | We study the advantage of the co-existence of future ground and space based gravitational wave detectors, in estimating the parameters of a binary coalescence. Using the post-Newtonian waveform for the inspiral of non-spinning neutron star-black hole pairs in circular orbits, we study how the estimates for chirp mass, ... |
2406.01498 | Benito A. Ju\'arez-Aubry | Benito A. Ju\'arez-Aubry, Bernard S. Kay, Tonatiuh Miramontes and
Daniel Sudarsky | The Hadamard condition on a Cauchy surface and the renormalized
stress-energy tensor | 64 pages | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Given a Cauchy surface in a curved spacetime and a suitably defined quantum
state on the CCR algebra of the Klein Gordon quantum field on that surface, we
show, by expanding the squared spacetime geodesic distance and the '$U$' and
'$V$' Hadamard coefficients (and suitable derivatives thereof) in sufficiently
accurat... | [
{
"created": "Mon, 3 Jun 2024 16:24:35 GMT",
"version": "v1"
}
] | 2024-06-04 | [
[
"Juárez-Aubry",
"Benito A.",
""
],
[
"Kay",
"Bernard S.",
""
],
[
"Miramontes",
"Tonatiuh",
""
],
[
"Sudarsky",
"Daniel",
""
]
] | Given a Cauchy surface in a curved spacetime and a suitably defined quantum state on the CCR algebra of the Klein Gordon quantum field on that surface, we show, by expanding the squared spacetime geodesic distance and the '$U$' and '$V$' Hadamard coefficients (and suitable derivatives thereof) in sufficiently accurate ... |
1605.06140 | Monica Forte | M\'onica Forte | Holographik, the k-essential approach to interactive models with
modified holographic Ricci dark energy | 16 pages, 6 figures, minor revision, references added | null | 10.1140/epjc/s10052-016-4572-0 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We make a scalar representation of interactive models with cold dark matter
and modified holographic Ricci dark energy through unified models driven by
scalar fields with non-canonical kinetic term. These models are applications of
the formalism of exotic k-essences generated by the global description of
cosmological... | [
{
"created": "Thu, 19 May 2016 20:55:44 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Nov 2016 15:36:32 GMT",
"version": "v2"
}
] | 2017-02-01 | [
[
"Forte",
"Mónica",
""
]
] | We make a scalar representation of interactive models with cold dark matter and modified holographic Ricci dark energy through unified models driven by scalar fields with non-canonical kinetic term. These models are applications of the formalism of exotic k-essences generated by the global description of cosmological m... |
1204.2468 | Chen Songbai | Songbai Chen, Jiliang Jing | Strong gravitational lensing by a rotating non-Kerr compact object | 16 pages, 10 figures. The corrected version to be appeared in Phys.
Rev. D | Phys. Rev. D 85, 124029 (2012) | 10.1103/PhysRevD.85.124029 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the strong gravitational lensing in the background of a rotating
non-Kerr compact object with a deformed parameter $\epsilon$ and an unbound
rotation parameter $a$. We find that the photon sphere radius and the
deflection angle depend sharply on the parameters $\epsilon$ and $a$. For the
case in which the bl... | [
{
"created": "Wed, 11 Apr 2012 14:54:44 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Jun 2012 15:29:58 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Chen",
"Songbai",
""
],
[
"Jing",
"Jiliang",
""
]
] | We study the strong gravitational lensing in the background of a rotating non-Kerr compact object with a deformed parameter $\epsilon$ and an unbound rotation parameter $a$. We find that the photon sphere radius and the deflection angle depend sharply on the parameters $\epsilon$ and $a$. For the case in which the blac... |
2205.10719 | Robert van den Hoogen | A. A. Coley and R. J. van den Hoogen and D. D. McNutt | Symmetric Teleparallel Geometries | 15 pages | Class. Quantum Grav., 39, 22LT01 (2022) | 10.1088/1361-6382/ac994a | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In teleparallel gravity and, in particular, in $F(T)$ teleparallel gravity,
there is a challenge in determining an appropriate (co-)frame and its
corresponding spin connection to describe the geometry. Very often, the
"proper" frame, the frame in which all inertial effects are absent, is not the
simplest (e.g, diagon... | [
{
"created": "Sun, 22 May 2022 03:08:15 GMT",
"version": "v1"
},
{
"created": "Sun, 5 Jun 2022 11:41:42 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Aug 2022 11:17:27 GMT",
"version": "v3"
}
] | 2022-11-17 | [
[
"Coley",
"A. A.",
""
],
[
"Hoogen",
"R. J. van den",
""
],
[
"McNutt",
"D. D.",
""
]
] | In teleparallel gravity and, in particular, in $F(T)$ teleparallel gravity, there is a challenge in determining an appropriate (co-)frame and its corresponding spin connection to describe the geometry. Very often, the "proper" frame, the frame in which all inertial effects are absent, is not the simplest (e.g, diagonal... |
1212.1755 | Henrique de Andrade Gomes | Henrique Gomes | Poincar\'e invariance and asymptotic flatness in Shape Dynamics | 22 pages, matches accepted version | Phys. Rev. D 88, 024047 (2013) | 10.1103/PhysRevD.88.024047 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Shape Dynamics is a theory of gravity that waives refoliation invariance in
favor of spatial Weyl invariance. It is a canonical theory, constructed from a
Hamiltonian, 3+1 perspective. One of the main deficits of Shape Dynamics is
that its Hamiltonian is only implicitly constructed as a functional of the
phase space ... | [
{
"created": "Sat, 8 Dec 2012 03:03:04 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Jul 2013 02:51:52 GMT",
"version": "v2"
}
] | 2015-06-12 | [
[
"Gomes",
"Henrique",
""
]
] | Shape Dynamics is a theory of gravity that waives refoliation invariance in favor of spatial Weyl invariance. It is a canonical theory, constructed from a Hamiltonian, 3+1 perspective. One of the main deficits of Shape Dynamics is that its Hamiltonian is only implicitly constructed as a functional of the phase space va... |
gr-qc/0406072 | Niklas Rohr | J. Mark Heinzle, N. Rohr, C. Uggla | Matter and dynamics in closed cosmologies | 23 pages, 24 figures (compressed), LaTeX | Phys.Rev. D71 (2005) 083506 | 10.1103/PhysRevD.71.083506 | null | gr-qc | null | To systematically analyze the dynamical implications of the matter content in
cosmology, we generalize earlier dynamical systems approaches so that perfect
fluids with a general barotropic equation of state can be treated. We focus on
locally rotationally symmetric Bianchi type IX and Kantowski-Sachs orthogonal
perfe... | [
{
"created": "Fri, 18 Jun 2004 13:52:53 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Heinzle",
"J. Mark",
""
],
[
"Rohr",
"N.",
""
],
[
"Uggla",
"C.",
""
]
] | To systematically analyze the dynamical implications of the matter content in cosmology, we generalize earlier dynamical systems approaches so that perfect fluids with a general barotropic equation of state can be treated. We focus on locally rotationally symmetric Bianchi type IX and Kantowski-Sachs orthogonal perfect... |
gr-qc/9607023 | Roland Puntigam | Roland A. Puntigam, Claus L\"ammerzahl, Friedrich W. Hehl (Theoretical
Physics, University of Cologne, Germany) | Maxwell's theory on a post-Riemannian spacetime and the equivalence
principle | 9 pages, REVTeX, no figures; minor changes, version to be published
in Class. Quantum Grav | Class.Quant.Grav. 14 (1997) 1347-1356 | 10.1088/0264-9381/14/5/033 | Cologne-thp-1996-H15 | gr-qc | null | The form of Maxwell's theory is well known in the framework of general
relativity, a fact that is related to the applicability of the principle of
equivalence to electromagnetic phenomena. We pose the question whether this
form changes if torsion and/or nonmetricity fields are allowed for in
spacetime. Starting from ... | [
{
"created": "Wed, 10 Jul 1996 10:25:22 GMT",
"version": "v1"
},
{
"created": "Sun, 22 Sep 1996 09:11:12 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Feb 1997 14:53:44 GMT",
"version": "v3"
}
] | 2016-08-15 | [
[
"Puntigam",
"Roland A.",
"",
"Theoretical\n Physics, University of Cologne, Germany"
],
[
"Lämmerzahl",
"Claus",
"",
"Theoretical\n Physics, University of Cologne, Germany"
],
[
"Hehl",
"Friedrich W.",
"",
"Theoretical\n Physics, University of Cologne, Ge... | The form of Maxwell's theory is well known in the framework of general relativity, a fact that is related to the applicability of the principle of equivalence to electromagnetic phenomena. We pose the question whether this form changes if torsion and/or nonmetricity fields are allowed for in spacetime. Starting from th... |
1408.5260 | Andrea Geralico | Donato Bini, Andrea Geralico, Maria Haney, Robert T. Jantzen | Scattering of particles by radiation fields: a comparative analysis | 13 pages, 1 figure; published version | Phys. Rev. D 86, 064016 (2012) | 10.1103/PhysRevD.86.064016 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The features of the scattering of massive neutral particles propagating in
the field of a gravitational plane wave are compared with those characterizing
their interaction with an electromagnetic radiation field. The motion is
geodesic in the former case, whereas in the case of an electromagnetic pulse it
is accelera... | [
{
"created": "Fri, 22 Aug 2014 10:53:45 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Bini",
"Donato",
""
],
[
"Geralico",
"Andrea",
""
],
[
"Haney",
"Maria",
""
],
[
"Jantzen",
"Robert T.",
""
]
] | The features of the scattering of massive neutral particles propagating in the field of a gravitational plane wave are compared with those characterizing their interaction with an electromagnetic radiation field. The motion is geodesic in the former case, whereas in the case of an electromagnetic pulse it is accelerate... |
gr-qc/0309079 | Carlos Molina Mendes | C. Molina, D. Giugno, E. Abdalla and A. Saa | Field propagation in de Sitter black holes | 15 pages, 16 figures, published version | Phys.Rev. D69 (2004) 104013 | 10.1103/PhysRevD.69.104013 | null | gr-qc astro-ph hep-th | null | We present an exhaustive analysis of scalar, electromagnetic and
gravitational perturbations in the background of Schwarzchild-de Sitter and
Reissner-Nordstrom-de Sitter spacetimes. The field propagation is considered by
means of a semi-analytical (WKB) approach and two numerical schemes: the
characteristic and gener... | [
{
"created": "Wed, 17 Sep 2003 18:11:41 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Feb 2004 01:40:31 GMT",
"version": "v2"
},
{
"created": "Sun, 9 Apr 2006 00:24:41 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Molina",
"C.",
""
],
[
"Giugno",
"D.",
""
],
[
"Abdalla",
"E.",
""
],
[
"Saa",
"A.",
""
]
] | We present an exhaustive analysis of scalar, electromagnetic and gravitational perturbations in the background of Schwarzchild-de Sitter and Reissner-Nordstrom-de Sitter spacetimes. The field propagation is considered by means of a semi-analytical (WKB) approach and two numerical schemes: the characteristic and general... |
1805.04987 | Ednilton S. de Oliveira Ph.D. | Ednilton S. de Oliveira | Scalar scattering from black holes with tidal charge | null | Eur. Phys. J. C (2018) 78:876 | 10.1140/epjc/s10052-018-6316-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The cross sections of black holes with tidal charge predicted in the context
of the Randall--Sundrum brane-world scenario are computed considering the
massless scalar field. Results obtained for black holes with different
tidal-charge intensities are compared in order to study how this charge
modifies the black hole ... | [
{
"created": "Mon, 14 May 2018 02:16:27 GMT",
"version": "v1"
},
{
"created": "Mon, 28 May 2018 21:06:20 GMT",
"version": "v2"
}
] | 2018-11-06 | [
[
"de Oliveira",
"Ednilton S.",
""
]
] | The cross sections of black holes with tidal charge predicted in the context of the Randall--Sundrum brane-world scenario are computed considering the massless scalar field. Results obtained for black holes with different tidal-charge intensities are compared in order to study how this charge modifies the black hole cr... |
1907.08682 | Pardyumn Kumar Sahoo | Parbati Sahoo, S. Bhattacharjee, S. K. Tripathy, P.K. Sahoo | Bouncing scenario in $f(R,T)$ gravity | Accepted version at MPLA | Modern Physics Letters A, 35 (2020) 2050095 | 10.1142/S0217732320500959 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present manuscript presents modeling of matter bounce in the framework of
$f(R,T)$ gravity where $f(R,T) = R + 2 \lambda T$. We start by defining a
parametrization of scale factor which is non-vanishing. The geometrical
parameters such as the Hubble parameter and deceleration parameter are derived,
from which exp... | [
{
"created": "Thu, 18 Jul 2019 11:20:03 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Oct 2019 04:42:45 GMT",
"version": "v2"
},
{
"created": "Tue, 28 Jan 2020 03:57:25 GMT",
"version": "v3"
}
] | 2020-02-04 | [
[
"Sahoo",
"Parbati",
""
],
[
"Bhattacharjee",
"S.",
""
],
[
"Tripathy",
"S. K.",
""
],
[
"Sahoo",
"P. K.",
""
]
] | The present manuscript presents modeling of matter bounce in the framework of $f(R,T)$ gravity where $f(R,T) = R + 2 \lambda T$. We start by defining a parametrization of scale factor which is non-vanishing. The geometrical parameters such as the Hubble parameter and deceleration parameter are derived, from which expre... |
gr-qc/0407060 | Alexander Poltorak | Alexander Poltorak | Gravity as Nonmetricity: General Relativity in Metric-Affine Space
(Ln,g) | 15 pages. LaTeX. Was presented at the 17th International Conference
on General Relativity and Gravitation (GR17), Dublin 2004. Typos corrected | null | null | null | gr-qc | null | A new geometric interpretation for General Relativity (GR) is proposed. We
show that in the presence of an arbitrary affine connection, the gravitational
field is described as nonmetricity of the affine connection. An affine
connection can be interpreted as induced by a frame of reference (FR). Although
the gravitati... | [
{
"created": "Thu, 15 Jul 2004 22:32:38 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Jul 2004 20:00:16 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Poltorak",
"Alexander",
""
]
] | A new geometric interpretation for General Relativity (GR) is proposed. We show that in the presence of an arbitrary affine connection, the gravitational field is described as nonmetricity of the affine connection. An affine connection can be interpreted as induced by a frame of reference (FR). Although the gravitation... |
1808.05015 | Sandro Marcio Rodrigues Micheletti | Sandro M. R. Micheletti | Quintessence and tachyon dark energy in interaction with dark matter:
Observational constraints and model selection | To be published in the International Journal of Modern Physics D | Int. J. Mod. Phys. D 29, no. 8, 2050057 (2020) | 10.1142/S0218271820500571 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive two field theory models of interacting dark energy, one in which
dark energy is associated with the quintessence and another in which it is
associated with the tachyon. In both, instead of choosing arbitrarily the
potential of scalar fields, these are specified implicitly by imposing that the
dark energy fi... | [
{
"created": "Wed, 15 Aug 2018 09:42:33 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Aug 2018 12:36:07 GMT",
"version": "v2"
},
{
"created": "Sun, 21 Jun 2020 02:54:48 GMT",
"version": "v3"
}
] | 2020-07-10 | [
[
"Micheletti",
"Sandro M. R.",
""
]
] | We derive two field theory models of interacting dark energy, one in which dark energy is associated with the quintessence and another in which it is associated with the tachyon. In both, instead of choosing arbitrarily the potential of scalar fields, these are specified implicitly by imposing that the dark energy fiel... |
1010.1928 | Vjacheslav Dorofeev | V. Yu. Dorofeev | The Riemann-Cartan space in the O-theory | 12 pages | null | 10.1134/S0202289312020065 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Nonrelativistic equation of particle with a spin for the Lagrangian on a
nonassociative algebra is obtained. It is shown that in this model arises
Riemann-Cartan space. In the case of central symmetry in addition to the
pseudo-curvature appears torsion as pseudovector that interacts with the spin
of the particle. An ... | [
{
"created": "Sun, 10 Oct 2010 15:18:19 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Dorofeev",
"V. Yu.",
""
]
] | Nonrelativistic equation of particle with a spin for the Lagrangian on a nonassociative algebra is obtained. It is shown that in this model arises Riemann-Cartan space. In the case of central symmetry in addition to the pseudo-curvature appears torsion as pseudovector that interacts with the spin of the particle. An es... |
2308.03716 | Iarley P. Lobo Dr | Pedro H. Morais, Iarley P. Lobo, Christian Pfeifer, Rafael Alves
Batista, Valdir B. Bezerra | Modified particle lifetimes as a signature of deformed relativity | 5 pages. Acknowledgments added. Matches published version | Phys.Lett.B 848 (2024) 138380 | 10.1016/j.physletb.2023.138380 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We demonstrate a compatibility between the relativity principle and the clock
postulate in deformed special relativity, by identifying the relevant deformed
Lorentz transformations in position space between arbitrary frames. This result
leads to a first-principles correction to the dilated lifetime of fundamental
par... | [
{
"created": "Mon, 7 Aug 2023 16:38:07 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Aug 2023 17:46:05 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Dec 2023 23:10:52 GMT",
"version": "v3"
}
] | 2023-12-18 | [
[
"Morais",
"Pedro H.",
""
],
[
"Lobo",
"Iarley P.",
""
],
[
"Pfeifer",
"Christian",
""
],
[
"Batista",
"Rafael Alves",
""
],
[
"Bezerra",
"Valdir B.",
""
]
] | We demonstrate a compatibility between the relativity principle and the clock postulate in deformed special relativity, by identifying the relevant deformed Lorentz transformations in position space between arbitrary frames. This result leads to a first-principles correction to the dilated lifetime of fundamental parti... |
1909.07033 | Ming Zhang | Ming Zhang, Minyong Guo | Can shadows reflect phase structures of black holes? | 9 pages, 8 captioned figures, to appear in EPJC | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by-sa/4.0/ | The relation between the black hole shadow and the black hole thermodynamics
is investigated. We find that the phase structure can be reflected by the
shadow radius for the spherically symmetric black hole. We also find that the
shadow size gives correct information but the distortion of the shadow gives
wrong inform... | [
{
"created": "Mon, 16 Sep 2019 07:29:11 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Sep 2019 06:26:46 GMT",
"version": "v2"
},
{
"created": "Tue, 28 Apr 2020 14:37:46 GMT",
"version": "v3"
},
{
"created": "Tue, 2 Jun 2020 13:35:26 GMT",
"version": "v4"
},
{
"cr... | 2020-08-28 | [
[
"Zhang",
"Ming",
""
],
[
"Guo",
"Minyong",
""
]
] | The relation between the black hole shadow and the black hole thermodynamics is investigated. We find that the phase structure can be reflected by the shadow radius for the spherically symmetric black hole. We also find that the shadow size gives correct information but the distortion of the shadow gives wrong informat... |
1901.07524 | Emilio Rub\'in de Celis | C. Tomasini, E. Rub\'in de Celis and C. Simeone | Arbitrarily coupled massive scalar field in conical thin-shell
spacetimes | 17 pages | null | 10.1140/epjc/s10052-019-6722-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the massive scalar field of a charged particle held at rest in
conical thin-shell spacetimes with one or two asymptotic regions. Resonant and
stable scalar Green's functions are characterized in terms of the coupling of
the field to the trace of the extrinsic curvature jump at the shell. Stable
coupling valu... | [
{
"created": "Tue, 22 Jan 2019 18:57:32 GMT",
"version": "v1"
}
] | 2019-03-27 | [
[
"Tomasini",
"C.",
""
],
[
"de Celis",
"E. Rubín",
""
],
[
"Simeone",
"C.",
""
]
] | We study the massive scalar field of a charged particle held at rest in conical thin-shell spacetimes with one or two asymptotic regions. Resonant and stable scalar Green's functions are characterized in terms of the coupling of the field to the trace of the extrinsic curvature jump at the shell. Stable coupling values... |
1510.02573 | Sudipta Das | Sudipta Das, Ujjal Debnath, Abdulla Al Mamon | Generalized Second Law of Thermodynamics for Non-canonical Scalar Field
Model with Corrected-Entropy | 15 pages, 8 figures, Accepted for publication in EPJC | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we have considered a non-canonical scalar field dark energy
model in the framework of flat FRW background. It has also been assumed that
the dark matter sector interacts with the non-canonical dark energy sector
through some interaction term. Using the solutions for this interacting
non-canonical scalar... | [
{
"created": "Fri, 9 Oct 2015 05:25:52 GMT",
"version": "v1"
}
] | 2015-10-12 | [
[
"Das",
"Sudipta",
""
],
[
"Debnath",
"Ujjal",
""
],
[
"Mamon",
"Abdulla Al",
""
]
] | In this work, we have considered a non-canonical scalar field dark energy model in the framework of flat FRW background. It has also been assumed that the dark matter sector interacts with the non-canonical dark energy sector through some interaction term. Using the solutions for this interacting non-canonical scalar f... |
1901.06638 | Spyros Basilakos | Spyros Basilakos, Nick E. Mavromatos, Joan Sola | Scalar Field Theory Description of the Running Vacuum Model: the
Vacuumon | 15 pages, 3 figures, JCAP, 025, 12 (2019) | null | 10.1088/1475-7516/2019/12/025 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the running vacuum model (RVM) in the framework of scalar
field theory.This dynamical vacuum model provides an elegant global explanation
of the cosmic history, namely the universe starts from a non-singular initial
de Sitter vacuum stage, it passes smoothly from an early inflationary era to a
radiatio... | [
{
"created": "Sun, 20 Jan 2019 08:02:29 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Jan 2019 09:57:53 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Nov 2019 08:45:01 GMT",
"version": "v3"
},
{
"created": "Tue, 10 Dec 2019 14:04:05 GMT",
"version": "v4"
}
] | 2019-12-18 | [
[
"Basilakos",
"Spyros",
""
],
[
"Mavromatos",
"Nick E.",
""
],
[
"Sola",
"Joan",
""
]
] | We investigate the running vacuum model (RVM) in the framework of scalar field theory.This dynamical vacuum model provides an elegant global explanation of the cosmic history, namely the universe starts from a non-singular initial de Sitter vacuum stage, it passes smoothly from an early inflationary era to a radiation ... |
gr-qc/0606043 | Valerii Dryuma sem | Valery Dryuma | 10-Dim Einstein spaces made up on basis of 6-Dim Ricci-flat spaces and
4-Dim Einstein spaces | 8 pages | null | null | null | gr-qc | null | Some examples of ten-dimensional vacuum Einstein spaces made up on basis of
four-dimensional Ricci-flat spaces and six-dimensional Ricci-flat spaces
defined by solutions of the Sin-Gordon equation are constructed. The properties
of geodesics for such type of the spaces are discussed
| [
{
"created": "Fri, 9 Jun 2006 19:29:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dryuma",
"Valery",
""
]
] | Some examples of ten-dimensional vacuum Einstein spaces made up on basis of four-dimensional Ricci-flat spaces and six-dimensional Ricci-flat spaces defined by solutions of the Sin-Gordon equation are constructed. The properties of geodesics for such type of the spaces are discussed |
1805.02328 | Jiliang Jing | Weiping Yao, Chaohui Yang, Jiliang Jing | Holographic insulator/superconductor transition with exponential
nonlinear electrodynamics probed by entanglement entropy | 15 pages, 6 figures | Eur. Phys. J. C. (2018) 78: 353 | 10.1140/epjc/s10052-018-5836-7 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | From the viewpoint of holography, we study the behaviors of the entanglement
entropy in insulator/superconductor transition with exponential nonlinear
electrodynamics (ENE). We find that the entanglement entropy is a good probe to
the properties of the holographic phase transition. Both in the half space and
the belt... | [
{
"created": "Mon, 7 May 2018 03:04:54 GMT",
"version": "v1"
}
] | 2018-05-23 | [
[
"Yao",
"Weiping",
""
],
[
"Yang",
"Chaohui",
""
],
[
"Jing",
"Jiliang",
""
]
] | From the viewpoint of holography, we study the behaviors of the entanglement entropy in insulator/superconductor transition with exponential nonlinear electrodynamics (ENE). We find that the entanglement entropy is a good probe to the properties of the holographic phase transition. Both in the half space and the belt s... |
2106.08836 | Takuya Takahashi | Takuya Takahashi and Takahiro Tanaka | Axion clouds may survive the perturbative tidal interaction over the
early inspiral phase of black hole binaries | 15 pages, 4 figures | null | 10.1088/1475-7516/2021/10/031 | null | gr-qc astro-ph.CO hep-ph | http://creativecommons.org/licenses/by/4.0/ | Gravitational wave observation has the potential of probing ultralight
bosonic fields such as axion. Axion forms a cloud around a rotating black hole
(BH) by superradiant instability and should affect the gravitational waveform
from binary BHs. On the other hand, considering the cloud associated with a BH
in a binary... | [
{
"created": "Wed, 16 Jun 2021 14:55:11 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Jun 2021 14:22:33 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Aug 2021 12:22:45 GMT",
"version": "v3"
}
] | 2021-10-20 | [
[
"Takahashi",
"Takuya",
""
],
[
"Tanaka",
"Takahiro",
""
]
] | Gravitational wave observation has the potential of probing ultralight bosonic fields such as axion. Axion forms a cloud around a rotating black hole (BH) by superradiant instability and should affect the gravitational waveform from binary BHs. On the other hand, considering the cloud associated with a BH in a binary s... |
0909.3341 | Jan Harms | Jan Harms, Riccardo DeSalvo, Steven Dorsher and Vuk Mandic | Simulation of underground gravity gradients from stochastic seismic
fields | 24 pages, 12 figures | null | 10.1103/PhysRevD.80.122001 | null | gr-qc physics.geo-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present results obtained from a finite-element simulation of seismic
displacement fields and of gravity gradients generated by those fields. The
displacement field is constructed by a plane wave model with a 3D isotropic
stochastic field and a 2D fundamental Rayleigh field. The plane wave model
provides an accurat... | [
{
"created": "Fri, 18 Sep 2009 00:57:05 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"Harms",
"Jan",
""
],
[
"DeSalvo",
"Riccardo",
""
],
[
"Dorsher",
"Steven",
""
],
[
"Mandic",
"Vuk",
""
]
] | We present results obtained from a finite-element simulation of seismic displacement fields and of gravity gradients generated by those fields. The displacement field is constructed by a plane wave model with a 3D isotropic stochastic field and a 2D fundamental Rayleigh field. The plane wave model provides an accurate ... |
2307.12244 | Xiangyu Lyu | Xiangyu Lyu, En-Kun Li, Yi-Ming Hu | Parameter Estimation of Stellar Mass Binary Black Holes under the
Network of TianQin and LISA | 17 pages, 6 figures, | Phys. Rev. D 2023 | 10.1103/PhysRevD.108.083023 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a Bayesian parameter estimation progress to infer the stellar mass
binary black hole properties by TianQin, LISA, and TianQin+LISA.Two typical
stellar mass black hole binary systems, GW150914 and GW190521 are chosen as the
fiducial sources. In this work, we establish the ability of TianQin to infer
the par... | [
{
"created": "Sun, 23 Jul 2023 06:58:49 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Dec 2023 08:40:44 GMT",
"version": "v2"
}
] | 2023-12-08 | [
[
"Lyu",
"Xiangyu",
""
],
[
"Li",
"En-Kun",
""
],
[
"Hu",
"Yi-Ming",
""
]
] | We present a Bayesian parameter estimation progress to infer the stellar mass binary black hole properties by TianQin, LISA, and TianQin+LISA.Two typical stellar mass black hole binary systems, GW150914 and GW190521 are chosen as the fiducial sources. In this work, we establish the ability of TianQin to infer the param... |
gr-qc/0001016 | Hiromi Saida | Hiromi Saida & Jiro Soda | BTZ Black Hole Entropy in Higher Curvature Gravity | Appeared in The Proceedings of the 9th Workshop on General Relativity
and Gravitation (Japan), 8pages, no figure | null | null | null | gr-qc | null | For the BTZ black hole in the Einstein gravity, a statistical entropy has
been calculated. It is equal to the Bekenstein-Hawking entropy. In this
article, its statistical entropy in the higer curvature gravity is calculated
and shown to be equal to one derived by using the Noether charge method. This
suggests that th... | [
{
"created": "Fri, 7 Jan 2000 07:38:28 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jan 2000 10:02:56 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Saida",
"Hiromi",
""
],
[
"Soda",
"Jiro",
""
]
] | For the BTZ black hole in the Einstein gravity, a statistical entropy has been calculated. It is equal to the Bekenstein-Hawking entropy. In this article, its statistical entropy in the higer curvature gravity is calculated and shown to be equal to one derived by using the Noether charge method. This suggests that the ... |
gr-qc/9309004 | null | Sean A. Hayward, Tetsuya Shiromizu & Ken-ichi Nakao | A Cosmological Constant Limits the Size of Black Holes | 10 pages | Phys.Rev. D49 (1994) 5080-5085 | 10.1103/PhysRevD.49.5080 | null | gr-qc | null | In a space-time with cosmological constant $\Lambda>0$ and matter satisfying
the dominant energy condition, the area of a black or white hole cannot exceed
$4\pi/\Lambda$. This applies to event horizons where defined, i.e. in an
asymptotically deSitter space-time, and to outer trapping horizons (cf.
apparent horizons... | [
{
"created": "Thu, 2 Sep 1993 13:48:35 GMT",
"version": "v1"
},
{
"created": "Wed, 25 May 1994 06:08:35 GMT",
"version": "v2"
}
] | 2009-10-22 | [
[
"Hayward",
"Sean A.",
""
],
[
"Shiromizu",
"Tetsuya",
""
],
[
"Nakao",
"Ken-ichi",
""
]
] | In a space-time with cosmological constant $\Lambda>0$ and matter satisfying the dominant energy condition, the area of a black or white hole cannot exceed $4\pi/\Lambda$. This applies to event horizons where defined, i.e. in an asymptotically deSitter space-time, and to outer trapping horizons (cf. apparent horizons) ... |
gr-qc/9812095 | Walter J. Wild | Walter J. Wild | A Matrix Formulation of Einstein's Vacuum Field Equations | 8 pages | null | null | null | gr-qc | null | We develop a correspondence between arbitrary tensors and matrices based on
the use of Kronecker products and associated identities.
Utilizing the rules of matrix differentiation we derive the vacuum Einstein
field equations as a differential-matrix equation. This formulation may
facilitate their efficient use in n... | [
{
"created": "Thu, 31 Dec 1998 08:53:28 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wild",
"Walter J.",
""
]
] | We develop a correspondence between arbitrary tensors and matrices based on the use of Kronecker products and associated identities. Utilizing the rules of matrix differentiation we derive the vacuum Einstein field equations as a differential-matrix equation. This formulation may facilitate their efficient use in numer... |
1409.3758 | Ram Gopal Vishwakarma | Ram Gopal Vishwakarma | A New Solution of Einstein Vacuum Field Equations | Pramana - J. Phys. (in press) | null | 10.1007/s12043-015-0946-3 | null | gr-qc astro-ph.CO math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new solution of Einstein's vacuum field equations is discovered which
appears as a generalization of the well-known Ozsvath-Schucking solution and
explains its source of curvature which has otherwise remained hidden.
Curiously, the new solution has a vanishing Kretschmann scalar and is
singularity-free despite bein... | [
{
"created": "Thu, 11 Sep 2014 17:34:21 GMT",
"version": "v1"
}
] | 2015-09-22 | [
[
"Vishwakarma",
"Ram Gopal",
""
]
] | A new solution of Einstein's vacuum field equations is discovered which appears as a generalization of the well-known Ozsvath-Schucking solution and explains its source of curvature which has otherwise remained hidden. Curiously, the new solution has a vanishing Kretschmann scalar and is singularity-free despite being ... |
1401.7622 | Aur\'elien Hees | A. Hees, S. Bertone, C. Le Poncin-Lafitte | Relativistic formulation of coordinate light time, Doppler and
astrometric observables up to the second post-Minkowskian order | 22 pages, 5 figures, accepted in Phys. Rev. D | Phys. Rev. D 89, 064045, 2014 | 10.1103/PhysRevD.89.064045 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Given the extreme accuracy of modern space science, a precise relativistic
modeling of observations is required. In particular, it is important to
describe properly light propagation through the Solar System. For two decades,
several modeling efforts based on the solution of the null geodesic equations
have been prop... | [
{
"created": "Wed, 29 Jan 2014 18:56:24 GMT",
"version": "v1"
}
] | 2014-03-21 | [
[
"Hees",
"A.",
""
],
[
"Bertone",
"S.",
""
],
[
"Poncin-Lafitte",
"C. Le",
""
]
] | Given the extreme accuracy of modern space science, a precise relativistic modeling of observations is required. In particular, it is important to describe properly light propagation through the Solar System. For two decades, several modeling efforts based on the solution of the null geodesic equations have been propos... |
1402.2256 | Giovanni Otalora | Giovanni Otalora | A novel teleparallel dark energy model | 15 pages, 2 figures, 3 tables | International Journal of Modern Physics D International Journal of
Modern Physics D, Vol. 25, No. 2 (2016) 1650025 (15 pages) | 10.1142/S0218271816500255 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Although equivalent to general relativity, teleparallel gravity is
conceptually speaking a completely different theory. In this theory, the
gravitational field is described by torsion, not by curvature. By working in
this context, a new model is proposed in which the four-derivative of a
canonical scalar field repres... | [
{
"created": "Mon, 10 Feb 2014 20:25:16 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Nov 2015 17:35:09 GMT",
"version": "v2"
}
] | 2015-11-30 | [
[
"Otalora",
"Giovanni",
""
]
] | Although equivalent to general relativity, teleparallel gravity is conceptually speaking a completely different theory. In this theory, the gravitational field is described by torsion, not by curvature. By working in this context, a new model is proposed in which the four-derivative of a canonical scalar field represen... |
1805.08064 | Roman Sverdlov | Roman Sverdlov | Electromagnetic Lagrangian on a causal set that resides on edges rather
than points | 40 pages, no figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The goal of this paper is to introduce one of the versions of the
electromagnetic Lagrangian on a causal set in such a way that would address the
non-locality issues inherent to causal set theory. The key idea is that
Lagrangian density is assigned to the edges rather than points, and there is a
way of defining the c... | [
{
"created": "Thu, 17 May 2018 22:05:10 GMT",
"version": "v1"
},
{
"created": "Wed, 23 May 2018 17:16:49 GMT",
"version": "v2"
}
] | 2018-05-24 | [
[
"Sverdlov",
"Roman",
""
]
] | The goal of this paper is to introduce one of the versions of the electromagnetic Lagrangian on a causal set in such a way that would address the non-locality issues inherent to causal set theory. The key idea is that Lagrangian density is assigned to the edges rather than points, and there is a way of defining the con... |
2004.07476 | Hakan Cebeci | Hakan Cebeci | Matter coupling in Minimal Massive 3D Gravity and spinor-matter
interactions in exterior algebra formalism | Updated version, Title and Abstract changed, accepted for publication | null | 10.1088/1361-6382/ac43d4 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, by employing the exterior algebra formalism, we study the
matter coupling in Minimal Massive 3D Gravity (MMG) by first considering that
the matter Lagrangian is connection-independent and then considering that the
matter coupling is connection-dependent. The matter coupling in MMG has been
previously in... | [
{
"created": "Thu, 16 Apr 2020 06:29:39 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Jul 2020 07:16:53 GMT",
"version": "v2"
},
{
"created": "Wed, 5 Jan 2022 19:08:05 GMT",
"version": "v3"
}
] | 2022-01-07 | [
[
"Cebeci",
"Hakan",
""
]
] | In this work, by employing the exterior algebra formalism, we study the matter coupling in Minimal Massive 3D Gravity (MMG) by first considering that the matter Lagrangian is connection-independent and then considering that the matter coupling is connection-dependent. The matter coupling in MMG has been previously inve... |
gr-qc/9906097 | Chris Clarkson | Chris Clarkson and Richard Barrett | Does the Isotropy of the CMB Imply a Homogeneous Universe? Some
Generalised EGS Theorems | replaced with final version. Added discusion and refs | Class.Quant.Grav. 16 (1999) 3781-3794 | 10.1088/0264-9381/16/12/302 | null | gr-qc astro-ph | null | We demonstrate that the high isotropy of the Cosmic Microwave Background
(CMB), combined with the Copernican principle, is not sufficient to prove
homogeneity of the universe -- in contrast to previous results on this subject.
The crucial additional factor not included in earlier work is the acceleration
of the funda... | [
{
"created": "Wed, 23 Jun 1999 23:25:34 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Dec 1999 17:03:13 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Clarkson",
"Chris",
""
],
[
"Barrett",
"Richard",
""
]
] | We demonstrate that the high isotropy of the Cosmic Microwave Background (CMB), combined with the Copernican principle, is not sufficient to prove homogeneity of the universe -- in contrast to previous results on this subject. The crucial additional factor not included in earlier work is the acceleration of the fundame... |
2212.12144 | Teng Zhang | Teng Zhang, Huan Yang, Denis Martynov, Patricia Schmidt, Haixing Miao | A Gravitational Wave Detector for Post Merger Neutron Stars: Beyond the
Quantum Loss Limit of Michelson Fabry Perot Interferometer | 12 pages, 9 figures | Phys. Rev. X. 13, 021019 (2023) | 10.1103/PhysRevX.13.021019 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Advanced gravitational-wave detectors that have made groundbreaking
discoveries are Michelson interferometers with resonating optical cavities as
their arms. As light travels at finite speed, these cavities are optimal for
enhancing signals at frequencies below their bandwidth frequency. A small
amount of optical los... | [
{
"created": "Fri, 23 Dec 2022 04:36:29 GMT",
"version": "v1"
},
{
"created": "Sun, 1 Jan 2023 00:58:04 GMT",
"version": "v2"
},
{
"created": "Fri, 13 Jan 2023 14:13:12 GMT",
"version": "v3"
},
{
"created": "Thu, 2 Feb 2023 11:57:18 GMT",
"version": "v4"
},
{
"cre... | 2023-05-30 | [
[
"Zhang",
"Teng",
""
],
[
"Yang",
"Huan",
""
],
[
"Martynov",
"Denis",
""
],
[
"Schmidt",
"Patricia",
""
],
[
"Miao",
"Haixing",
""
]
] | Advanced gravitational-wave detectors that have made groundbreaking discoveries are Michelson interferometers with resonating optical cavities as their arms. As light travels at finite speed, these cavities are optimal for enhancing signals at frequencies below their bandwidth frequency. A small amount of optical loss ... |
0805.3469 | Dr. Anirudh Pradhan | Anirudh Pradhan and Raj Bali | Magnetized Bianchi Type $VI_{0}$ Barotropic Massive String Universe with
Decaying Vacuum Energy Density $\Lambda$ | 14 pages, no figures | Elect. J. Theor. Phys. 15:91-104,2008 | 10.1007/s10773-008-9918-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Bianchi type $VI_{0}$ massive string cosmological models using the technique
given by Letelier (1983) with magnetic field are investigated. To get the
deterministic models, we assume that the expansion ($\theta$) in the model is
proportional to the shear ($\sigma$) and also the fluid obeys the barotropic
equation of ... | [
{
"created": "Thu, 22 May 2008 14:31:53 GMT",
"version": "v1"
}
] | 2015-06-30 | [
[
"Pradhan",
"Anirudh",
""
],
[
"Bali",
"Raj",
""
]
] | Bianchi type $VI_{0}$ massive string cosmological models using the technique given by Letelier (1983) with magnetic field are investigated. To get the deterministic models, we assume that the expansion ($\theta$) in the model is proportional to the shear ($\sigma$) and also the fluid obeys the barotropic equation of st... |
gr-qc/9406014 | Roberto De Pietri | Roberto De Pietri & Carlo Rovelli | Eigenvalues of the Weyl operator as observables of general relativity | 15 pages, LaTex style, preprint UPRF-94-399 | Class.Quant.Grav.12:1279-1286,1995 | 10.1088/0264-9381/12/5/017 | null | gr-qc | null | We consider the eigenvalues of the three-dimensional Weyl operator defined in
terms of the (Euclidean) Ashtekar variables, and we study their dependence on
the gravitational field. We notice that these eigenvalues can be used as
gravitational variables, and derive explicit formulas for their Poisson
brackets and thei... | [
{
"created": "Wed, 8 Jun 1994 11:38:13 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"De Pietri",
"Roberto",
""
],
[
"Rovelli",
"Carlo",
""
]
] | We consider the eigenvalues of the three-dimensional Weyl operator defined in terms of the (Euclidean) Ashtekar variables, and we study their dependence on the gravitational field. We notice that these eigenvalues can be used as gravitational variables, and derive explicit formulas for their Poisson brackets and their ... |
1612.08517 | Sunil Maharaj | R. Mohanlal, S. D. Maharaj, A. K. Tiwari, R. Narain | Radiating stars with exponential Lie symmetries | 14 pages, submitted for publication | Gen. Relativ. Gravit. 48, 87 (2016) | 10.1007/s10714-016-2081-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the general model of a radiating star in general relativity. A
group analysis of the under determined, nonlinear partial differential equation
governing the model's gravitational potentials is performed. This analysis is
an extension of previous group analyses carried out and produces new group
invariant s... | [
{
"created": "Tue, 27 Dec 2016 07:04:49 GMT",
"version": "v1"
}
] | 2017-01-04 | [
[
"Mohanlal",
"R.",
""
],
[
"Maharaj",
"S. D.",
""
],
[
"Tiwari",
"A. K.",
""
],
[
"Narain",
"R.",
""
]
] | We analyze the general model of a radiating star in general relativity. A group analysis of the under determined, nonlinear partial differential equation governing the model's gravitational potentials is performed. This analysis is an extension of previous group analyses carried out and produces new group invariant sol... |
2211.07023 | Wei-Liang Qian | Shui-Fa Shen, Wei-Liang Qian, Hong Guo, Shao-Jun Zhang, Jin Li | An implementation of the matrix method using Chebyshev grid | 13 pages, 6 tables | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this work, we explore the properties of the matrix method for black hole
quasinormal modes on the nonuniform grid. In particular, the method is
implemented to be adapted to the Chebyshev grid, aimed at effectively
suppressing Runge's phenomenon. It is found that while such an implementation
is favorable from a mat... | [
{
"created": "Sun, 13 Nov 2022 21:49:56 GMT",
"version": "v1"
}
] | 2022-11-15 | [
[
"Shen",
"Shui-Fa",
""
],
[
"Qian",
"Wei-Liang",
""
],
[
"Guo",
"Hong",
""
],
[
"Zhang",
"Shao-Jun",
""
],
[
"Li",
"Jin",
""
]
] | In this work, we explore the properties of the matrix method for black hole quasinormal modes on the nonuniform grid. In particular, the method is implemented to be adapted to the Chebyshev grid, aimed at effectively suppressing Runge's phenomenon. It is found that while such an implementation is favorable from a mathe... |
1506.06228 | Seyyed Shahrokh Assyyaee | N. Riazi and Sh. Assyyaee | A new look at dark energy | 6 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The origin of the dark energy which is assumed to be responsible for the
observed accelerated expansion of the universe still remains a scientific
dilemma. Here we propose a tentative origin for this energy, if it is coming
from a distribution of specific quantum particles.
| [
{
"created": "Sat, 20 Jun 2015 11:04:20 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Riazi",
"N.",
""
],
[
"Assyyaee",
"Sh.",
""
]
] | The origin of the dark energy which is assumed to be responsible for the observed accelerated expansion of the universe still remains a scientific dilemma. Here we propose a tentative origin for this energy, if it is coming from a distribution of specific quantum particles. |
gr-qc/0212080 | Jose Geraldo Pereira | Yu. N. Obukhov and J. G. Pereira | Metric-affine approach to teleparallel gravity | Revtex4, 22 pages, no figures. Accepted for publication in Phys. Rev.
D | Phys.Rev. D67 (2003) 044016 | 10.1103/PhysRevD.67.044016 | IFT.P-94/2002 | gr-qc | null | The teleparallel gravity theory, treated physically as a gauge theory of
translations, naturally represents a particular case of the most general
gauge-theoretic model based on the general affine group of spacetime. On the
other hand, geometrically, the Weitzenboeck spacetime of distant parallelism is
a particular ca... | [
{
"created": "Thu, 19 Dec 2002 15:20:07 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Obukhov",
"Yu. N.",
""
],
[
"Pereira",
"J. G.",
""
]
] | The teleparallel gravity theory, treated physically as a gauge theory of translations, naturally represents a particular case of the most general gauge-theoretic model based on the general affine group of spacetime. On the other hand, geometrically, the Weitzenboeck spacetime of distant parallelism is a particular case... |
gr-qc/0601078 | David Wands | David Wands (ICG, Portsmouth) | Brane-world cosmology | 16 pages, 4 figures, to appear in proceedings of ERE2005, the XXVIII
Spanish Relativity Meeting, Oviedo, Spain | null | 10.1063/1.2218177 | PU-ICG-06/01 | gr-qc astro-ph hep-th | null | Brane-world models, where observers are restricted to a brane in a
higher-dimensional spacetime, offer a novel perspective on cosmology. I discuss
some approaches to cosmology in extra dimensions and some interesting aspects
of gravity and cosmology in brane-world models.
| [
{
"created": "Thu, 19 Jan 2006 11:05:44 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Wands",
"David",
"",
"ICG, Portsmouth"
]
] | Brane-world models, where observers are restricted to a brane in a higher-dimensional spacetime, offer a novel perspective on cosmology. I discuss some approaches to cosmology in extra dimensions and some interesting aspects of gravity and cosmology in brane-world models. |
0912.0115 | A. Tawfik | A. Tawfik (ECTP & Mti U), H. Mansour (Cairo U), M. Wahba (ECTP & Mti
U) | Hubble Parameter in Bulk Viscous Cosmology | 4 pages, 2 eps figure, Talk given at 12th Marcel Grossmann Meeting on
"General Relativity", Paris-France, 12-18 July 2009 | null | null | ECTP-2009-9 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss influences of bulk viscosity on the Early Universe, which is
modeled by Friedmann-Robertson-Walker metric and Einstein field equations. We
assume that the matter filling the isotropic and homogeneous background is
relativistic viscous characterized by ultra-relativistic equations of state
deduced from rece... | [
{
"created": "Tue, 1 Dec 2009 10:25:08 GMT",
"version": "v1"
}
] | 2009-12-02 | [
[
"Tawfik",
"A.",
"",
"ECTP & Mti U"
],
[
"Mansour",
"H.",
"",
"Cairo U"
],
[
"Wahba",
"M.",
"",
"ECTP & Mti\n U"
]
] | We discuss influences of bulk viscosity on the Early Universe, which is modeled by Friedmann-Robertson-Walker metric and Einstein field equations. We assume that the matter filling the isotropic and homogeneous background is relativistic viscous characterized by ultra-relativistic equations of state deduced from recent... |
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