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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2001.02074 | Ali \"Ovg\"un Dr. | Zonghai Li and Ali \"Ovg\"un | Finite-distance gravitational deflection of massive particles by the
Kerr-like black hole in the bumblebee gravity model | 10 pages. Accepted for publication in Physical Review D
(https://journals.aps.org/prd/accepted/2f075Q54Yc61d726a4e76b7039e3f7ff75cad8901) | Phys. Rev. D 101, 024040 (2020) | 10.1103/PhysRevD.101.024040 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the weak gravitational deflection angle of
relativistic massive particles by the Kerr-like black hole in the bumblebee
gravity model. In particular, we focus on weak field limits and calculate the
deflection angle for a receiver and source at a finite distance from the lens.
To this end, we us... | [
{
"created": "Fri, 3 Jan 2020 20:46:14 GMT",
"version": "v1"
}
] | 2020-01-23 | [
[
"Li",
"Zonghai",
""
],
[
"Övgün",
"Ali",
""
]
] | In this paper, we study the weak gravitational deflection angle of relativistic massive particles by the Kerr-like black hole in the bumblebee gravity model. In particular, we focus on weak field limits and calculate the deflection angle for a receiver and source at a finite distance from the lens. To this end, we use ... |
gr-qc/0512016 | Hans-Thomas Elze | Hans-Thomas Elze | Deterministic models of quantum fields | 6 pages; synopsis of hep-th/0510267, hep-th/0503069, hep-th/0411176 .
Talk at Constrained Dynamics and Quantum Gravity - QG05, Cala Gonone
(Sardinia, Italy), September 12-16, 2005. To appear in the proceedings | J. Phys.: Conf. Ser. 33 (2006) 399-404 | 10.1088/1742-6596/33/1/049 | null | gr-qc | null | Deterministic dynamical models are discussed which can be described in
quantum mechanical terms. -- In particular, a local quantum field theory is
presented which is a supersymmetric classical model. The Hilbert space approach
of Koopman and von Neumann is used to study the classical evolution of an
ensemble of such ... | [
{
"created": "Fri, 2 Dec 2005 11:59:03 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Elze",
"Hans-Thomas",
""
]
] | Deterministic dynamical models are discussed which can be described in quantum mechanical terms. -- In particular, a local quantum field theory is presented which is a supersymmetric classical model. The Hilbert space approach of Koopman and von Neumann is used to study the classical evolution of an ensemble of such sy... |
gr-qc/0211032 | Ioannis Raptis | Anastasios Mallios | On localizing topological algebras | 23 pages | null | null | null | gr-qc | null | Through the subsequent discussion we consider a certain particular sort of
(topological) algebras, which may substitute the `` structure sheaf algebras''
in many--in point of fact, in all--the situations of a geometrical character
that occur, thus far, in several mathematical disciplines, as for instance,
differentia... | [
{
"created": "Mon, 11 Nov 2002 13:47:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mallios",
"Anastasios",
""
]
] | Through the subsequent discussion we consider a certain particular sort of (topological) algebras, which may substitute the `` structure sheaf algebras'' in many--in point of fact, in all--the situations of a geometrical character that occur, thus far, in several mathematical disciplines, as for instance, differential ... |
0812.3996 | Thomas Sotiriou | Ted Jacobson, Thomas P. Sotiriou | String dynamics and ejection along the axis of a spinning black hole | 14 pages, 11 figures; v.2: minor edits, references added, typos
corrected, published version | Phys.Rev.D79:065029,2009 | 10.1103/PhysRevD.79.065029 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Relativistic current carrying strings moving axisymmetrically on the
background of a Kerr black hole are studied. The boundaries and possible types
of motion of a string with a given energy and current are found. Regions of
parameters for which the string falls into the black hole, or is trapped in a
toroidal volume,... | [
{
"created": "Sat, 20 Dec 2008 20:50:25 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Mar 2009 17:50:18 GMT",
"version": "v2"
}
] | 2010-04-14 | [
[
"Jacobson",
"Ted",
""
],
[
"Sotiriou",
"Thomas P.",
""
]
] | Relativistic current carrying strings moving axisymmetrically on the background of a Kerr black hole are studied. The boundaries and possible types of motion of a string with a given energy and current are found. Regions of parameters for which the string falls into the black hole, or is trapped in a toroidal volume, o... |
2404.16949 | Mamma Emma | Mattia Emma, Tiago Fernandes de Nobrega, and Gregory Ashton | Comparing advanced-era interferometric gravitational-wave detector
network configurations: sky localization and source properties | null | null | null | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by-nc-nd/4.0/ | The expansion and upgrade of the global network of ground-based gravitational
wave detectors promises to improve our capacity to infer the sky-localization
of transient sources, enabling more effective multi-messenger follow-ups. At
the same time, the increase in the signal-to-noise ratio of detected events
allows fo... | [
{
"created": "Thu, 25 Apr 2024 18:02:05 GMT",
"version": "v1"
}
] | 2024-04-29 | [
[
"Emma",
"Mattia",
""
],
[
"de Nobrega",
"Tiago Fernandes",
""
],
[
"Ashton",
"Gregory",
""
]
] | The expansion and upgrade of the global network of ground-based gravitational wave detectors promises to improve our capacity to infer the sky-localization of transient sources, enabling more effective multi-messenger follow-ups. At the same time, the increase in the signal-to-noise ratio of detected events allows for ... |
1505.05390 | Joao Paulo Pitelli Manoel | J.P.M. Pitelli and R.A. Mosna | Scattering by a topological defect connecting two asymptotically
Minkowski spacetimes | 8 pages, 5 figures. To appear in Phys Rev D | Phys. Rev. D, 91, 120425 (2015) | 10.1103/PhysRevD.91.124025 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the stability and the scattering properties of a spacetime with a
topological defect along a spherical bubble. This bubble connects two flat
spacetimes which are asymptotically Minkowski, so that the resulting universe
may be regarded as containing a wormhole. Its distinguished feature is the
absence of exot... | [
{
"created": "Wed, 20 May 2015 14:13:33 GMT",
"version": "v1"
}
] | 2016-05-09 | [
[
"Pitelli",
"J. P. M.",
""
],
[
"Mosna",
"R. A.",
""
]
] | We study the stability and the scattering properties of a spacetime with a topological defect along a spherical bubble. This bubble connects two flat spacetimes which are asymptotically Minkowski, so that the resulting universe may be regarded as containing a wormhole. Its distinguished feature is the absence of exotic... |
1301.4341 | Dirk Puetzfeld | Dirk Puetzfeld, Yuri N. Obukhov | Covariant equations of motion for test bodies in gravitational theories
with general nonminimal coupling | 8 pages, RevTex format, 2 additional references, small typos fixed | Phys. Rev. D 87, 044045 (2013) | 10.1103/PhysRevD.87.044045 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a covariant derivation of the equations of motion for test bodies
for a wide class of gravitational theories with nonminimal coupling,
encompassing a general interaction via the complete set of 9 parity-even
curvature invariants. The equations of motion for spinning test bodies in such
theories are explici... | [
{
"created": "Fri, 18 Jan 2013 10:20:13 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Mar 2013 08:49:42 GMT",
"version": "v2"
}
] | 2013-03-05 | [
[
"Puetzfeld",
"Dirk",
""
],
[
"Obukhov",
"Yuri N.",
""
]
] | We present a covariant derivation of the equations of motion for test bodies for a wide class of gravitational theories with nonminimal coupling, encompassing a general interaction via the complete set of 9 parity-even curvature invariants. The equations of motion for spinning test bodies in such theories are explicitl... |
1506.02495 | Rodolfo Camargo De Freitas | F. G. Alvarenga, R. Fracalossi, R. C. Freitas and S. V. B.
Gon\c{c}alves | The Kantowski-Sachs quantum model with stiff matter fluid | 12 pages | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the quantum cosmological Kantowski-Sachs model and
solve the Wheeler-DeWitt equation in minisuperspace to obtain the wave function
of the corresponding universe. The perfect fluid is described by the Schutz's
canonical formalism, which allows to attribute dynamical degrees of freedom to
matter.... | [
{
"created": "Thu, 28 May 2015 21:07:28 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Nov 2016 13:07:34 GMT",
"version": "v2"
}
] | 2016-11-11 | [
[
"Alvarenga",
"F. G.",
""
],
[
"Fracalossi",
"R.",
""
],
[
"Freitas",
"R. C.",
""
],
[
"Gonçalves",
"S. V. B.",
""
]
] | In this paper we study the quantum cosmological Kantowski-Sachs model and solve the Wheeler-DeWitt equation in minisuperspace to obtain the wave function of the corresponding universe. The perfect fluid is described by the Schutz's canonical formalism, which allows to attribute dynamical degrees of freedom to matter. T... |
2206.13946 | Ash Danehkar PhD | A. Danehkar | Covariant Evolution of Gravitoelectromagnetism | 50 pages, published by Universe | Universe 8:318, 2022 | 10.3390/universe8060318 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The long-range gravitational terms associated with tidal forces,
frame-dragging effects, and gravitational waves are described by the Weyl
conformal tensor, the traceless part of the Riemann curvature that is not
locally affected by the matter field. The Ricci and Bianchi identities provide
a set of dynamical and kin... | [
{
"created": "Sun, 26 Jun 2022 17:40:24 GMT",
"version": "v1"
}
] | 2022-06-29 | [
[
"Danehkar",
"A.",
""
]
] | The long-range gravitational terms associated with tidal forces, frame-dragging effects, and gravitational waves are described by the Weyl conformal tensor, the traceless part of the Riemann curvature that is not locally affected by the matter field. The Ricci and Bianchi identities provide a set of dynamical and kinem... |
gr-qc/9812044 | null | Giampiero Esposito and Cosimo Stornaiolo | A New Family of Gauges in Linearized General Relativity | 28 pages, plain Tex. In the revised version, sections 4 and 5 are
completely new | Class.Quant.Grav. 17 (2000) 1989-2005 | 10.1088/0264-9381/17/9/309 | DSF preprint 98/45 | gr-qc | null | For vacuum Maxwell theory in four dimensions, a supplementary condition
exists (due to Eastwood and Singer) which is invariant under conformal
rescalings of the metric, in agreement with the conformal symmetry of the
Maxwell equations. Thus, starting from the de Donder gauge, which is not
conformally invariant but is... | [
{
"created": "Sat, 12 Dec 1998 18:27:45 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Aug 1999 06:50:45 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Esposito",
"Giampiero",
""
],
[
"Stornaiolo",
"Cosimo",
""
]
] | For vacuum Maxwell theory in four dimensions, a supplementary condition exists (due to Eastwood and Singer) which is invariant under conformal rescalings of the metric, in agreement with the conformal symmetry of the Maxwell equations. Thus, starting from the de Donder gauge, which is not conformally invariant but is t... |
1911.02129 | Dong-han Yeom | Mariam Bouhmadi-L\'opez, Suddhasattwa Brahma, Che-Yu Chen, Pisin Chen,
Dong-han Yeom | Annihilation-to-nothing: a quantum gravitational boundary condition for
the Schwarzschild black hole | 20 pages, 7 figures | JCAP 11 (2020) 002 | 10.1088/1475-7516/2020/11/002 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The interior of a static Schwarzschild metric can be written in terms of two
functions, similar to some models of anisotropic cosmology. With a suitable
choice of canonical variables, we solve the Wheeler-DeWitt equation (WDW)
inside the horizon of a Schwarzschild black hole. By imposing classicality near
the horizon... | [
{
"created": "Tue, 5 Nov 2019 23:13:24 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Nov 2020 05:26:44 GMT",
"version": "v2"
}
] | 2020-11-24 | [
[
"Bouhmadi-López",
"Mariam",
""
],
[
"Brahma",
"Suddhasattwa",
""
],
[
"Chen",
"Che-Yu",
""
],
[
"Chen",
"Pisin",
""
],
[
"Yeom",
"Dong-han",
""
]
] | The interior of a static Schwarzschild metric can be written in terms of two functions, similar to some models of anisotropic cosmology. With a suitable choice of canonical variables, we solve the Wheeler-DeWitt equation (WDW) inside the horizon of a Schwarzschild black hole. By imposing classicality near the horizon, ... |
2107.05926 | Tuan Do | Tuyen M. Pham, Duy H. Nguyen, Tuan Q. Do | k-Gauss-Bonnet inflation | 9 pages, single column, 2 figures. Updated version, in which many
discussions along with relevant references are added. All calculations are
not modified. Comments are welcome | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a novel {\it k}-Gauss-Bonnet inflationary model, in which a
kinetic term of scalar field is allowed to non-minimally couple to the
Gauss-Bonnet topological invariant in the absence of a potential of scalar
field. As a result, this model is shown to admit an isotropic power-law
inflation provided that the s... | [
{
"created": "Tue, 13 Jul 2021 08:58:08 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jul 2021 09:20:44 GMT",
"version": "v2"
},
{
"created": "Tue, 15 Feb 2022 16:40:29 GMT",
"version": "v3"
}
] | 2022-02-16 | [
[
"Pham",
"Tuyen M.",
""
],
[
"Nguyen",
"Duy H.",
""
],
[
"Do",
"Tuan Q.",
""
]
] | We propose a novel {\it k}-Gauss-Bonnet inflationary model, in which a kinetic term of scalar field is allowed to non-minimally couple to the Gauss-Bonnet topological invariant in the absence of a potential of scalar field. As a result, this model is shown to admit an isotropic power-law inflation provided that the sca... |
gr-qc/9607047 | null | Fran\c{c}ois Goy | Non-Invariant Velocity of Light and Clock Synchronisation in Accelerated
Systems | 10 pages, Latex type, 2 figures; contribution to the London
conference on Physical Interpretations of Relativity Theory (6-9/09/1996) | null | null | null | gr-qc | null | Clock synchronisation is conventional when inertial systems are involved.
This statement is no longer true in accelerated systems. A demonstration is
given in the case of a rotating platform. We conclude that theories based on
the Einstein's clock synchronisation procedure are unable to explain, for
example, the Sagn... | [
{
"created": "Mon, 22 Jul 1996 17:47:38 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Goy",
"François",
""
]
] | Clock synchronisation is conventional when inertial systems are involved. This statement is no longer true in accelerated systems. A demonstration is given in the case of a rotating platform. We conclude that theories based on the Einstein's clock synchronisation procedure are unable to explain, for example, the Sagnac... |
1108.0949 | Leonard Parker | Ivan Agullo, Jose Navarro-Salas, Gonzalo J. Olmo, Leonard Parker | Remarks on the renormalization of primordial cosmological perturbations | 5 pages | null | 10.1103/PhysRevD.84.107304 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We briefly review the need to perform renormalization of inflationary
perturbations to properly work out the physical power spectra. We also
summarize the basis of (momentum-space) renormalization in curved spacetime and
address several misconceptions found in recent literature on this subject.
| [
{
"created": "Wed, 3 Aug 2011 20:58:17 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Agullo",
"Ivan",
""
],
[
"Navarro-Salas",
"Jose",
""
],
[
"Olmo",
"Gonzalo J.",
""
],
[
"Parker",
"Leonard",
""
]
] | We briefly review the need to perform renormalization of inflationary perturbations to properly work out the physical power spectra. We also summarize the basis of (momentum-space) renormalization in curved spacetime and address several misconceptions found in recent literature on this subject. |
2110.06167 | Bernardo Araneda | Bernardo Araneda | Conformal geometry and half-integrable spacetimes | 37+11 pages, 1 figure | null | null | null | gr-qc math.DG | http://creativecommons.org/licenses/by/4.0/ | Using a combination of techniques from conformal and complex geometry, we
show the potentialization of 4-dimensional closed Einstein-Weyl structures
which are half-algebraically special and admit a "half-integrable"
almost-complex structure. That is, we reduce the Einstein-Weyl equations to a
single, conformally inva... | [
{
"created": "Tue, 12 Oct 2021 17:02:04 GMT",
"version": "v1"
}
] | 2021-10-13 | [
[
"Araneda",
"Bernardo",
""
]
] | Using a combination of techniques from conformal and complex geometry, we show the potentialization of 4-dimensional closed Einstein-Weyl structures which are half-algebraically special and admit a "half-integrable" almost-complex structure. That is, we reduce the Einstein-Weyl equations to a single, conformally invari... |
2107.14736 | Nirban Bose | Nirban Bose and Archana Pai | Effective chirp mass captures the inspiral frequency evolution of the
non-spinning eccentric compact binary | 10 pages, 10 figures | null | 10.1103/PhysRevD.104.124021 | LIGO-P2100280 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Compact binary systems with black holes are the primary sources of
interferometric advanced gravitational wave detectors. Astrophysical models
suggest finite possibility of binary systems with appreciable non-zero
eccentricity in the dense stellar environment like globular clusters and
galactic nuclei. While most of ... | [
{
"created": "Fri, 30 Jul 2021 16:22:27 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Dec 2021 11:53:24 GMT",
"version": "v2"
}
] | 2021-12-15 | [
[
"Bose",
"Nirban",
""
],
[
"Pai",
"Archana",
""
]
] | Compact binary systems with black holes are the primary sources of interferometric advanced gravitational wave detectors. Astrophysical models suggest finite possibility of binary systems with appreciable non-zero eccentricity in the dense stellar environment like globular clusters and galactic nuclei. While most of th... |
gr-qc/9508029 | Ysfujii | Yasunori Fujii (ICRR, U-Tokyo) | How natural is a small but nonzero cosmological constant? | 12 pages, latex, 5 figures as epsf files included, compressed
uuencoded | Astropart.Phys.5:133-138,1996 | 10.1016/0927-6505(96)00012-6 | null | gr-qc astro-ph | null | Based on our previous attempt, we propose a better way to understand a small
but nonzero cosmological constant, as indicated by a number of recent
observational studies. We re-examine the assumptions of our model of two scalar
fields, trying to explain the basic mechanism resulting in a series of
mini-inflations occu... | [
{
"created": "Mon, 14 Aug 1995 04:02:09 GMT",
"version": "v1"
}
] | 2011-05-23 | [
[
"Fujii",
"Yasunori",
"",
"ICRR, U-Tokyo"
]
] | Based on our previous attempt, we propose a better way to understand a small but nonzero cosmological constant, as indicated by a number of recent observational studies. We re-examine the assumptions of our model of two scalar fields, trying to explain the basic mechanism resulting in a series of mini-inflations occuri... |
gr-qc/0505053 | Paul Halpern | Paul Halpern | Energy Distribution of Black Plane Solutions | 9 pages | Mod. Phys. Lett. A, Vol. 21, No. 6, pp. 495-502, 2006 | 10.1142/S0217732306019748 | null | gr-qc | null | We use the Einstein energy-momentum complex to calculate the energy
distribution of static plane-symmetric solutions of the Einstein-Maxwell
equations in 3+1 dimensions with asymptotic anti-de Sitter behavior. This
solution is expressed in terms of three parameters: the mass, electric charge
and cosmological constant... | [
{
"created": "Wed, 11 May 2005 18:47:14 GMT",
"version": "v1"
},
{
"created": "Wed, 18 May 2005 15:13:46 GMT",
"version": "v2"
},
{
"created": "Sun, 6 Nov 2005 12:20:13 GMT",
"version": "v3"
},
{
"created": "Mon, 27 Mar 2006 18:59:51 GMT",
"version": "v4"
}
] | 2009-11-11 | [
[
"Halpern",
"Paul",
""
]
] | We use the Einstein energy-momentum complex to calculate the energy distribution of static plane-symmetric solutions of the Einstein-Maxwell equations in 3+1 dimensions with asymptotic anti-de Sitter behavior. This solution is expressed in terms of three parameters: the mass, electric charge and cosmological constant. ... |
gr-qc/0109023 | Peter Dunsby | G. F. R. Ellis, W. Stoeger, P. McEwan and P. Dunsby | Dynamics of Inflationary Universes with Positive Spatial Curvature | 9 Pages RevTex4. Revised and updated | Gen.Rel.Grav. 34 (2002) 1445-1459 | 10.1023/A:1020087004012 | null | gr-qc | null | If the spatial curvature of the universe is positive, then the curvature term
will always dominate at early enough times in a slow-rolling inflationary
epoch. This enhances inflationary effects and hence puts limits on the possible
number of e-foldings that can have occurred, independently of what happened
before inf... | [
{
"created": "Thu, 6 Sep 2001 14:30:23 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Feb 2002 13:40:15 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Ellis",
"G. F. R.",
""
],
[
"Stoeger",
"W.",
""
],
[
"McEwan",
"P.",
""
],
[
"Dunsby",
"P.",
""
]
] | If the spatial curvature of the universe is positive, then the curvature term will always dominate at early enough times in a slow-rolling inflationary epoch. This enhances inflationary effects and hence puts limits on the possible number of e-foldings that can have occurred, independently of what happened before infla... |
gr-qc/0604116 | Hongwei Yu | Zhiying Zhu, Hongwei Yu and Shizhuan Lu | Spontaneous excitation of an accelerated hydrogen atom coupled with
electromagnetic vacuum fluctuations | 8 pages, Revtex4, accepted for publication in PRD | Phys.Rev. D73 (2006) 107501 | 10.1103/PhysRevD.73.107501 | null | gr-qc hep-th quant-ph | null | We consider a multilevel hydrogen atom in interaction with the quantum
electromagnetic field and separately calculate the contributions of the vacuum
fluctuation and radiation reaction to the rate of change of the mean atomic
energy of the atom for uniform acceleration. It is found that the acceleration
disturbs the ... | [
{
"created": "Thu, 27 Apr 2006 01:38:01 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Zhu",
"Zhiying",
""
],
[
"Yu",
"Hongwei",
""
],
[
"Lu",
"Shizhuan",
""
]
] | We consider a multilevel hydrogen atom in interaction with the quantum electromagnetic field and separately calculate the contributions of the vacuum fluctuation and radiation reaction to the rate of change of the mean atomic energy of the atom for uniform acceleration. It is found that the acceleration disturbs the va... |
gr-qc/9606082 | Ayon Juan Eloy | Eloy Ay\'on (Grupo de F\'isica Te\'orica, Centro de Matem\'aticas y
F\'isica Te\'orica, ICIMAF, Cuba) | On the Equivalence of Brans-Dicke and Einstein Theories with Static
Black Holes | 4 pages, RevTeX, e-mail: eloy@cidet.icmf.edu.cu | null | null | null | gr-qc | null | A `no-hair' theorem for the Brans-Dicke field, in the domain of outer
communications of a static black hole, is established, when the trace of the
energy-momentum tensor, T, is a definite-sign scalar. This implies that
Brans-Dicke theory of gravitation, for matter with T of definite sign, is
equivalent to Einstein gr... | [
{
"created": "Fri, 28 Jun 1996 03:27:03 GMT",
"version": "v1"
}
] | 2016-08-15 | [
[
"Ayón",
"Eloy",
"",
"Grupo de Física Teórica, Centro de Matemáticas y\n Física Teórica, ICIMAF, Cuba"
]
] | A `no-hair' theorem for the Brans-Dicke field, in the domain of outer communications of a static black hole, is established, when the trace of the energy-momentum tensor, T, is a definite-sign scalar. This implies that Brans-Dicke theory of gravitation, for matter with T of definite sign, is equivalent to Einstein grav... |
gr-qc/0207042 | Burkhard Kleihaus | B. Kleihaus, J. Kunz and F. Navarro-Lerida | Rotating Einstein-Yang-Mills Black Holes | 63 pages, 10 figures | Phys.Rev. D66 (2002) 104001 | 10.1103/PhysRevD.66.104001 | null | gr-qc | null | We construct rotating hairy black holes in SU(2) Einstein-Yang-Mills theory.
These stationary axially symmetric black holes are asymptotically flat. They
possess non-trivial non-Abelian gauge fields outside their regular event
horizon, and they carry non-Abelian electric charge. In the limit of vanishing
angular mome... | [
{
"created": "Wed, 10 Jul 2002 11:08:44 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Kleihaus",
"B.",
""
],
[
"Kunz",
"J.",
""
],
[
"Navarro-Lerida",
"F.",
""
]
] | We construct rotating hairy black holes in SU(2) Einstein-Yang-Mills theory. These stationary axially symmetric black holes are asymptotically flat. They possess non-trivial non-Abelian gauge fields outside their regular event horizon, and they carry non-Abelian electric charge. In the limit of vanishing angular moment... |
gr-qc/0412136 | Giovanni Amelino-Camelia | Giovanni Amelino-Camelia | Introduction to Quantum-Gravity Phenomenology | 46 pages, LaTex. Based on lectures given at the 40th Karpacz Winter
School in Theoretical Physics | null | 10.1007/11377306_3 | null | gr-qc | null | After a brief review of the first phase of development of Quantum-Gravity
Phenomenology, I argue that this research line is now ready to enter a more
advanced phase: while at first it was legitimate to resort to heuristic
order-of-magnitude estimates, which were sufficient to establish that
sensitivity to Planck-scal... | [
{
"created": "Thu, 30 Dec 2004 16:05:31 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Amelino-Camelia",
"Giovanni",
""
]
] | After a brief review of the first phase of development of Quantum-Gravity Phenomenology, I argue that this research line is now ready to enter a more advanced phase: while at first it was legitimate to resort to heuristic order-of-magnitude estimates, which were sufficient to establish that sensitivity to Planck-scale ... |
2405.09411 | Bayram Tekin | Eren Gulmez, Bayram Tekin | Spin-spin Interactions in General Relativity versus Linearized Massive
Gravity: $N$-body Simulations | 11 pages, 6 figures | null | null | null | gr-qc astro-ph.CO hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We simulated spin-spin interactions of $N$-bodies in linearized General
Relativity (GR) and linearized Massive Gravity of the Fierz-Pauli type (mGR).
It was noted earlier that there is a discrete difference between the spin-spin
interaction potential in GR and mGR for a $2$-body system, akin to the van
Dam-Veltman-Za... | [
{
"created": "Wed, 15 May 2024 15:07:30 GMT",
"version": "v1"
}
] | 2024-05-16 | [
[
"Gulmez",
"Eren",
""
],
[
"Tekin",
"Bayram",
""
]
] | We simulated spin-spin interactions of $N$-bodies in linearized General Relativity (GR) and linearized Massive Gravity of the Fierz-Pauli type (mGR). It was noted earlier that there is a discrete difference between the spin-spin interaction potential in GR and mGR for a $2$-body system, akin to the van Dam-Veltman-Zakh... |
2302.11596 | Hao-Jui Kuan | Hao-Jui Kuan, Alan Tsz-Lok Lam, Daniela D. Doneva, Stoytcho S.
Yazadjiev, Masaru Shibata, Kenta Kiuchi | Dynamical Scalarization during Neutron Star Mergers in
scalar-Gauss-Bonnet Theory | 13 pages, 8 figures, 1 table | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In certain classes of the scalar-Gauss-Bonnet theory strong spacetime
curvature in the vicinity of neutron stars and black holes can spontaneously
trigger scalarization in the compact object if the coupling strength of the
scalar field to the Gauss-Bonnet invariant exceeds a critical value. Specifying
on neutron star... | [
{
"created": "Wed, 22 Feb 2023 19:00:14 GMT",
"version": "v1"
}
] | 2023-02-24 | [
[
"Kuan",
"Hao-Jui",
""
],
[
"Lam",
"Alan Tsz-Lok",
""
],
[
"Doneva",
"Daniela D.",
""
],
[
"Yazadjiev",
"Stoytcho S.",
""
],
[
"Shibata",
"Masaru",
""
],
[
"Kiuchi",
"Kenta",
""
]
] | In certain classes of the scalar-Gauss-Bonnet theory strong spacetime curvature in the vicinity of neutron stars and black holes can spontaneously trigger scalarization in the compact object if the coupling strength of the scalar field to the Gauss-Bonnet invariant exceeds a critical value. Specifying on neutron stars,... |
1906.07232 | Yasuyuki Hatsuda | Yasuyuki Hatsuda | Quasinormal modes of black holes and Borel summation | 15 pages, v2: references added, Mathematica codes are included in the
source file | Phys. Rev. D 101, 024008 (2020) | 10.1103/PhysRevD.101.024008 | RUP-19-18 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a simple and efficient way to compute quasinormal frequencies of
spherically symmetric black holes. We revisit an old idea that relates them to
bound state energies of anharmonic oscillators by an analytic continuation.
This connection enables us to achieve remarkable high-order computations of WKB
series ... | [
{
"created": "Mon, 17 Jun 2019 19:34:17 GMT",
"version": "v1"
},
{
"created": "Sat, 5 Oct 2019 07:16:18 GMT",
"version": "v2"
}
] | 2020-01-08 | [
[
"Hatsuda",
"Yasuyuki",
""
]
] | We propose a simple and efficient way to compute quasinormal frequencies of spherically symmetric black holes. We revisit an old idea that relates them to bound state energies of anharmonic oscillators by an analytic continuation. This connection enables us to achieve remarkable high-order computations of WKB series by... |
1308.1208 | Salvatore Capozziello | Salvatore Capozziello and Mariafelicia De Laurentis | Noether symmetries in extended gravity quantum cosmology | 20 pages, Proceedings of "49th Winter School of Theoretical Physics
Cosmology and non-equilibrium statistical mechanics", L{\ka}dek-Zdr\'oj,
Poland, February 10-16, 2013 | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We summarize the use of Noether symmetries in Minisuperspace Quantum
Cosmology. In particular, we consider minisuperspace models, showing that the
existence of conserved quantities gives selection rules that allow to recover
classical behaviors in cosmic evolution according to the so called Hartle
criterion. Such a c... | [
{
"created": "Tue, 6 Aug 2013 08:51:58 GMT",
"version": "v1"
}
] | 2013-08-07 | [
[
"Capozziello",
"Salvatore",
""
],
[
"De Laurentis",
"Mariafelicia",
""
]
] | We summarize the use of Noether symmetries in Minisuperspace Quantum Cosmology. In particular, we consider minisuperspace models, showing that the existence of conserved quantities gives selection rules that allow to recover classical behaviors in cosmic evolution according to the so called Hartle criterion. Such a cri... |
gr-qc/0102112 | Gaetano Vilasi | G. Sparano, G. Vilasi, A. M. Vinogradov | Gravitational fields with a non Abelian bidimensional Lie algebra of
symmetries | 8 pagese, latex, no figures | Phys.Lett. B513 (2001) 142-146 | 10.1016/S0370-2693(01)00722-5 | null | gr-qc hep-th | null | Vacuum gravitational fields invariant for a bidimensional non Abelian Lie
algebra of Killing fields, are explicitly described. They are parameterized
either by solutions of a transcendental equation (the tortoise equation) or by
solutions of a linear second order differential equation on the plane.
Gravitational fiel... | [
{
"created": "Wed, 28 Feb 2001 13:13:14 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Sparano",
"G.",
""
],
[
"Vilasi",
"G.",
""
],
[
"Vinogradov",
"A. M.",
""
]
] | Vacuum gravitational fields invariant for a bidimensional non Abelian Lie algebra of Killing fields, are explicitly described. They are parameterized either by solutions of a transcendental equation (the tortoise equation) or by solutions of a linear second order differential equation on the plane. Gravitational fields... |
gr-qc/0504003 | Juan A. Valiente-Kroon | J. A. Valiente Kroon | A characterisation of Schwarzschildean initial data | 11 pages, 1 figure | Phys.Rev. D72 (2005) 084003 | null | null | gr-qc | null | A theorem providing a characterisation of Schwarzschildean initial data sets
on slices with an asymptotically Euclidean end is proved. This characterisation
is based on the proportionality of the Weyl tensor and its D'Alambertian that
holds for some vacuum Petrov Type D spacetimes (e.g. the Schwarzschild
spacetime, t... | [
{
"created": "Fri, 1 Apr 2005 13:43:01 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kroon",
"J. A. Valiente",
""
]
] | A theorem providing a characterisation of Schwarzschildean initial data sets on slices with an asymptotically Euclidean end is proved. This characterisation is based on the proportionality of the Weyl tensor and its D'Alambertian that holds for some vacuum Petrov Type D spacetimes (e.g. the Schwarzschild spacetime, the... |
2401.06067 | Jonathan Engle | Ian W. Bornhoeft, Rafael G. Dias, Jonathan S. Engle | Diffeomorphism covariance and the quantum Schwarzschild interior | 25 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a notion of residual diffeomorphism covariance in quantum
Kantowski-Sachs (KS), describing the interior of a Schwarzschild black hole. We
solve for the family of Hamiltonian constraint operators satisfying the
associated covariance condition, as well as parity invariance, preservation of
the Bohr Hilbert... | [
{
"created": "Thu, 11 Jan 2024 17:32:38 GMT",
"version": "v1"
}
] | 2024-01-12 | [
[
"Bornhoeft",
"Ian W.",
""
],
[
"Dias",
"Rafael G.",
""
],
[
"Engle",
"Jonathan S.",
""
]
] | We introduce a notion of residual diffeomorphism covariance in quantum Kantowski-Sachs (KS), describing the interior of a Schwarzschild black hole. We solve for the family of Hamiltonian constraint operators satisfying the associated covariance condition, as well as parity invariance, preservation of the Bohr Hilbert s... |
1508.07664 | Viqar Husain | Viqar Husain, Babar Qureshi | Ground state of the universe and the cosmological constant. A
nonperturbative analysis | 5 pages, Small title change. Version to appear in Phys. Rev. Lett | Phys. Rev. Lett. 116, 061302 (2016) | 10.1103/PhysRevLett.116.061302 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The physical Hamiltonian of a gravity-matter system depends on the choice of
time, with the vacuum naturally identified as its ground state. We study the
expanding universe with scalar field in the volume time gauge. We show that the
vacuum energy density computed from the resulting Hamiltonian is a non-linear
functi... | [
{
"created": "Mon, 31 Aug 2015 02:10:52 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Feb 2016 04:05:49 GMT",
"version": "v2"
}
] | 2016-02-17 | [
[
"Husain",
"Viqar",
""
],
[
"Qureshi",
"Babar",
""
]
] | The physical Hamiltonian of a gravity-matter system depends on the choice of time, with the vacuum naturally identified as its ground state. We study the expanding universe with scalar field in the volume time gauge. We show that the vacuum energy density computed from the resulting Hamiltonian is a non-linear function... |
gr-qc/0304104 | Clovis Jacinto de Matos | Clovis Jacinto de Matos and Martin Tajmar | Advance of Mercury Perihelion Explained by Cogravity - Version II | 15 pages, 1 figure | null | null | null | gr-qc | null | The theory of General Relativity explaines the advance of Mercury perihelion
using space curvature and the Schwartzschild metric. We demonstrate that this
phenomena can also be interpreted due to the cogravitational field produced by
the apparent motion of the Sun around Mercury giving exactly the same estimate
as de... | [
{
"created": "Tue, 29 Apr 2003 15:56:41 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"de Matos",
"Clovis Jacinto",
""
],
[
"Tajmar",
"Martin",
""
]
] | The theory of General Relativity explaines the advance of Mercury perihelion using space curvature and the Schwartzschild metric. We demonstrate that this phenomena can also be interpreted due to the cogravitational field produced by the apparent motion of the Sun around Mercury giving exactly the same estimate as deri... |
1303.2336 | Hoavo Hova | Hoavo Hova | $\Lambda$CDM and Power-Law Expansion in Lyra's Geometry | 11 pages, references added | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We establish in a cosmological model based on Lyra's geometry a relationship
between a displacement vector field $ \phi_{\mu} $, the Hubble parameter and
the matter energy density $ \rho_{m} $ (with a constant equation of state $0
\le \omega_{m} < 1$) via an arbitrary function $\alpha(t)$. For a pressureless
matter (... | [
{
"created": "Sun, 10 Mar 2013 16:22:24 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Mar 2013 00:03:33 GMT",
"version": "v2"
},
{
"created": "Tue, 7 May 2013 19:27:25 GMT",
"version": "v3"
}
] | 2013-05-08 | [
[
"Hova",
"Hoavo",
""
]
] | We establish in a cosmological model based on Lyra's geometry a relationship between a displacement vector field $ \phi_{\mu} $, the Hubble parameter and the matter energy density $ \rho_{m} $ (with a constant equation of state $0 \le \omega_{m} < 1$) via an arbitrary function $\alpha(t)$. For a pressureless matter ($ ... |
gr-qc/0404036 | Gioel Calabrese | Gioel Calabrese | A remedy for constraint growth in Numerical Relativity | 10 pages, 5 figures | Class.Quant.Grav. 21 (2004) 4025-4040 | 10.1088/0264-9381/21/17/002 | null | gr-qc | null | Rapid growth of constraints is often observed in free evolutions of highly
gravitating systems. To alleviate this problem we investigate the effect of
adding spatial derivatives of the constraints to the right hand side of the
evolution equations, and we look at how this affects the character of the
system and the tr... | [
{
"created": "Thu, 8 Apr 2004 08:58:39 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Calabrese",
"Gioel",
""
]
] | Rapid growth of constraints is often observed in free evolutions of highly gravitating systems. To alleviate this problem we investigate the effect of adding spatial derivatives of the constraints to the right hand side of the evolution equations, and we look at how this affects the character of the system and the trea... |
gr-qc/0601024 | Ron Wiltshire | Ron Wiltshire | Isotropy, shear, symmetry and exact solutions for relativistic fluid
spheres | To appear in Classical and Quantum Gravity | Class.Quant.Grav.23:1365-1380,2006 | 10.1088/0264-9381/23/4/017 | null | gr-qc | null | The symmetry method is used to derive solutions of Einstein's equations for
fluid spheres using an isotropic metric and a velocity four vector that is
non-comoving. Initially the Lie, classical approach is used to review and
provide a connecting framework for many comoving and so shear free solutions.
This provides t... | [
{
"created": "Fri, 6 Jan 2006 09:48:10 GMT",
"version": "v1"
}
] | 2010-05-12 | [
[
"Wiltshire",
"Ron",
""
]
] | The symmetry method is used to derive solutions of Einstein's equations for fluid spheres using an isotropic metric and a velocity four vector that is non-comoving. Initially the Lie, classical approach is used to review and provide a connecting framework for many comoving and so shear free solutions. This provides the... |
1511.06025 | Alain Riazuelo | Alain Riazuelo | Seeing relativity -- I. Ray tracing in a Schwarzschild metric to explore
the maximal analytic extension of the metric and making a proper rendering of
the stars | null | International Journal of Modern Physics D Vol. 28, No. 02, 1950042
(2019) | 10.1142/S0218271819500421 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an implementation of a ray tracing code in the Schwarzschild
metric. We aim at building a numerical code with a correct implementation of
both special (aberration, amplification, Doppler) and general (deflection of
light, lensing, gravitational redshift) relativistic effects so as to simulate
what an obser... | [
{
"created": "Wed, 18 Nov 2015 23:43:25 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Aug 2018 14:27:23 GMT",
"version": "v2"
}
] | 2020-07-16 | [
[
"Riazuelo",
"Alain",
""
]
] | We present an implementation of a ray tracing code in the Schwarzschild metric. We aim at building a numerical code with a correct implementation of both special (aberration, amplification, Doppler) and general (deflection of light, lensing, gravitational redshift) relativistic effects so as to simulate what an observe... |
0902.2030 | Hao Wei | Hao Wei | Modified Holographic Dark Energy | 15 pages, 5 figures, revtex4; v2: new parameterizations added; v3:
title changed, Nucl. Phys. B in press; v4: published version | Nucl.Phys.B819:210-224,2009 | 10.1016/j.nuclphysb.2009.04.020 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, motivated by the energy bound suggested by Cohen {\it et al.},
we propose the modified holographic dark energy (MHDE) model. Choosing the IR
cut-off $L=R_{\rm CC}$ and considering the parameterizations $n^2=2-\lambda a$,
$n^2=2-3\lambda a^2/(1+3a^2)$ and $n^2=2-\lambda a^2/(\beta+a^2)$, we derive
all th... | [
{
"created": "Thu, 12 Feb 2009 07:32:00 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Mar 2009 15:16:01 GMT",
"version": "v2"
},
{
"created": "Fri, 24 Apr 2009 09:31:00 GMT",
"version": "v3"
},
{
"created": "Sun, 31 May 2009 07:58:00 GMT",
"version": "v4"
}
] | 2009-06-01 | [
[
"Wei",
"Hao",
""
]
] | In this work, motivated by the energy bound suggested by Cohen {\it et al.}, we propose the modified holographic dark energy (MHDE) model. Choosing the IR cut-off $L=R_{\rm CC}$ and considering the parameterizations $n^2=2-\lambda a$, $n^2=2-3\lambda a^2/(1+3a^2)$ and $n^2=2-\lambda a^2/(\beta+a^2)$, we derive all the ... |
1511.00645 | Alexei Deriglazov A | Alexei A. Deriglazov and Walberto Guzm\'an Ram\'irez | Ultra-relativistic spinning particle and a rotating body in external
fields | 34 pages, close to published version. arXiv admin note: text overlap
with arXiv:1509.04926 | Advances in High Energy Physics, vol. 2016, Article ID 1376016, 27
pages, 2016 | 10.1155/2016/1376016 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the vector model of spinning particle to analyze the influence of
spin-field coupling on the particle's trajectory in ultra-relativistic regime.
The Lagrangian with minimal spin-gravity interaction yields the equations
equivalent to the Mathisson-Papapetrou-Tulczyjew-Dixon (MPTD) equations of a
rotating body. ... | [
{
"created": "Tue, 27 Oct 2015 16:06:19 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Nov 2015 15:30:29 GMT",
"version": "v2"
},
{
"created": "Thu, 13 Oct 2016 15:47:59 GMT",
"version": "v3"
}
] | 2016-10-14 | [
[
"Deriglazov",
"Alexei A.",
""
],
[
"Ramírez",
"Walberto Guzmán",
""
]
] | We use the vector model of spinning particle to analyze the influence of spin-field coupling on the particle's trajectory in ultra-relativistic regime. The Lagrangian with minimal spin-gravity interaction yields the equations equivalent to the Mathisson-Papapetrou-Tulczyjew-Dixon (MPTD) equations of a rotating body. We... |
2102.07633 | Phongpichit Channuie | Thanyagamon Kanesom (Prince Songkla U.), Phongpichit Channuie
(Walailak U.), Narakorn Kaewkhao (Prince Songkla U.) | Noether Symmetry Approach in Eddington-inspired Born-Infeld gravity | v1: 13 pages, no figure | Eur. Phys. J. C81 (2021) no.4, 357 | 10.1140/epjc/s10052-021-09144-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we take a short recap of a formal framework of the
Eddington-inspired Born-Infeld (EiBI) theory of gravity and derive the
point-like Lagrangian for underlying theory based on the use of Noether gauge
symmetries (NGS). We study a Hessian matrix and quantify Euler-Lagrange
equations of EiBI universe. We d... | [
{
"created": "Mon, 15 Feb 2021 16:15:16 GMT",
"version": "v1"
}
] | 2021-04-27 | [
[
"Kanesom",
"Thanyagamon",
"",
"Prince Songkla U."
],
[
"Channuie",
"Phongpichit",
"",
"Walailak U."
],
[
"Kaewkhao",
"Narakorn",
"",
"Prince Songkla U."
]
] | In this work, we take a short recap of a formal framework of the Eddington-inspired Born-Infeld (EiBI) theory of gravity and derive the point-like Lagrangian for underlying theory based on the use of Noether gauge symmetries (NGS). We study a Hessian matrix and quantify Euler-Lagrange equations of EiBI universe. We dis... |
1810.04792 | Banafsheh Bahrami-Asl | S. H. Hendi and B. Bahrami Asl | Complexity of the Einstein-Born-Infeld-Massive Black holes | 11 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by interesting correspondence between computational complexity in a
CFT and the action evaluated on a WDW patch in the bulk, we study the
complexity of the Einstein-massive black holes in the presence of BI nonlinear
electrodynamics. The upper limit of Llyod bound according to the WDW patch is
investigated ... | [
{
"created": "Wed, 10 Oct 2018 11:29:45 GMT",
"version": "v1"
}
] | 2018-10-12 | [
[
"Hendi",
"S. H.",
""
],
[
"Asl",
"B. Bahrami",
""
]
] | Motivated by interesting correspondence between computational complexity in a CFT and the action evaluated on a WDW patch in the bulk, we study the complexity of the Einstein-massive black holes in the presence of BI nonlinear electrodynamics. The upper limit of Llyod bound according to the WDW patch is investigated an... |
0903.4153 | Alberto Carrasco Ferreira | Alberto Carrasco, Marc Mars | Stability of marginally outer trapped surfaces and symmetries | 23 pages, 3 figures | Class.Quant.Grav.26:175002,2009 | 10.1088/0264-9381/26/17/175002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study properties of stable, strictly stable and locally outermost
marginally outer trapped surfaces in spacelike hypersurfaces of spacetimes
possessing certain symmetries such as isometries, homotheties and conformal
Killings. We first obtain results for general diffeomorphisms in terms of the
so-called metric def... | [
{
"created": "Tue, 24 Mar 2009 18:49:34 GMT",
"version": "v1"
}
] | 2009-08-12 | [
[
"Carrasco",
"Alberto",
""
],
[
"Mars",
"Marc",
""
]
] | We study properties of stable, strictly stable and locally outermost marginally outer trapped surfaces in spacelike hypersurfaces of spacetimes possessing certain symmetries such as isometries, homotheties and conformal Killings. We first obtain results for general diffeomorphisms in terms of the so-called metric defor... |
1304.3025 | Norbert Bodendorfer | Norbert Bodendorfer, Yasha Neiman | The Wald entropy formula and loop quantum gravity | 23 pages. v2: journal version. Details added, discussion clarified | Phys. Rev. D 90, 084054 (2014) | 10.1103/PhysRevD.90.084054 | IGC-13/4-2 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We outline how the Wald entropy formula naturally arises in loop quantum
gravity based on recently introduced dimension-independent connection
variables. The key observation is that in a loop quantization of a generalized
gravity theory, the analog of the area operator turns out to measure, morally
speaking, the Wald... | [
{
"created": "Wed, 10 Apr 2013 17:10:46 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Nov 2014 11:24:28 GMT",
"version": "v2"
}
] | 2014-11-25 | [
[
"Bodendorfer",
"Norbert",
""
],
[
"Neiman",
"Yasha",
""
]
] | We outline how the Wald entropy formula naturally arises in loop quantum gravity based on recently introduced dimension-independent connection variables. The key observation is that in a loop quantization of a generalized gravity theory, the analog of the area operator turns out to measure, morally speaking, the Wald e... |
gr-qc/0106008 | Takashi Tamaki | Takashi Tamaki and Kei-ichi Maeda (Waseda University), Takashi Torii
(University of Tokyo) | Internal structure of Skyrme black hole | 5 pages, 4 figures, some contents added | Phys.Rev.D64:084019,2001 | 10.1103/PhysRevD.64.084019 | null | gr-qc | null | We consider the internal structure of the Skyrme black hole under a static
and spherically symmetric ansatz. $@u8(Be concentrate on solutions with the
node number one and with the "winding" number zero, where there exist two
solutions for each horizon radius; one solution is stable and the other is
unstable against l... | [
{
"created": "Mon, 4 Jun 2001 11:58:08 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Jul 2001 08:45:49 GMT",
"version": "v2"
}
] | 2010-11-19 | [
[
"Tamaki",
"Takashi",
"",
"Waseda University"
],
[
"Maeda",
"Kei-ichi",
"",
"Waseda University"
],
[
"Torii",
"Takashi",
"",
"University of Tokyo"
]
] | We consider the internal structure of the Skyrme black hole under a static and spherically symmetric ansatz. $@u8(Be concentrate on solutions with the node number one and with the "winding" number zero, where there exist two solutions for each horizon radius; one solution is stable and the other is unstable against lin... |
1608.02542 | Valerio Faraoni | Valerio Faraoni and Adriana M. Cardini | Analogues of glacial valley profiles in particle mechanics and in
cosmology | References added, one typographical error corrected | null | null | null | gr-qc astro-ph.CO physics.geo-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An ordinary differential equation describing the transverse profiles of
U-shaped glacial valleys, derived with a variational principle, has two formal
analogies which we analyze. First, an analogy with point particle mechanics
completes the description of the solutions. Second, an analogy with the
Friedmann equation ... | [
{
"created": "Mon, 8 Aug 2016 18:27:50 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Aug 2016 16:14:48 GMT",
"version": "v2"
}
] | 2016-08-16 | [
[
"Faraoni",
"Valerio",
""
],
[
"Cardini",
"Adriana M.",
""
]
] | An ordinary differential equation describing the transverse profiles of U-shaped glacial valleys, derived with a variational principle, has two formal analogies which we analyze. First, an analogy with point particle mechanics completes the description of the solutions. Second, an analogy with the Friedmann equation of... |
gr-qc/0504039 | Leonard Susskind | Leonard Susskind | Rebuttal to a Paper on Wormholes | null | null | null | null | gr-qc | null | In a recent paper on wormholes (gr-qc/0503097), the author of that paper
demonstrated that he didn't know what he was talking about. In this paper I
correct the author's naive erroneous misconceptions.
| [
{
"created": "Fri, 8 Apr 2005 19:08:20 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Susskind",
"Leonard",
""
]
] | In a recent paper on wormholes (gr-qc/0503097), the author of that paper demonstrated that he didn't know what he was talking about. In this paper I correct the author's naive erroneous misconceptions. |
1912.06138 | Sanved Kolekar | Sanved Kolekar, S. Shankaranarayanan and S. M. Chitre | Generation of CMB and Cosmological constant via bulk viscosity | v1: 12 pages, 2 figures; v2: 14 pages, 2 figures, accepted in GRG | null | 10.1007/s10714-020-02749-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A simple model of uniformly expanding, homogeneous Universe with a bulk
viscosity is studied wherein the inflationary density decays due to viscous
dissipation during the expansion phase of the Universe. The model is shown to
generate the Cosmic Microwave Background radiation (CMB). We also demonstrate
that, at late ... | [
{
"created": "Thu, 12 Dec 2019 16:27:38 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Aug 2020 17:12:57 GMT",
"version": "v2"
}
] | 2020-10-14 | [
[
"Kolekar",
"Sanved",
""
],
[
"Shankaranarayanan",
"S.",
""
],
[
"Chitre",
"S. M.",
""
]
] | A simple model of uniformly expanding, homogeneous Universe with a bulk viscosity is studied wherein the inflationary density decays due to viscous dissipation during the expansion phase of the Universe. The model is shown to generate the Cosmic Microwave Background radiation (CMB). We also demonstrate that, at late ti... |
1302.0900 | Jansen Formiga | J. B. Formiga, J. B. Fonseca--Neto, C. Romero | An Extension of Teleparallelism and the Geometrization of the
Electromagnetic Field | references added in version 2; 9 pages | null | 10.1103/PhysRevD.87.067702 | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As is well known, both Weyl and Weitzenb\"ock spacetimes were initially used
as attempts to geometrize the electromagnetic field. In this letter, we prove
that this field can also be regarded as a geometrical quantity in an extended
version of the Weitzenb\"ock spacetime. The new geometry encompasses features
of both... | [
{
"created": "Mon, 4 Feb 2013 23:22:53 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Feb 2013 21:44:17 GMT",
"version": "v2"
}
] | 2013-04-03 | [
[
"Formiga",
"J. B.",
""
],
[
"Fonseca--Neto",
"J. B.",
""
],
[
"Romero",
"C.",
""
]
] | As is well known, both Weyl and Weitzenb\"ock spacetimes were initially used as attempts to geometrize the electromagnetic field. In this letter, we prove that this field can also be regarded as a geometrical quantity in an extended version of the Weitzenb\"ock spacetime. The new geometry encompasses features of both W... |
gr-qc/0208020 | Grigori Volovik | G.E. Volovik | Black-hole horizon and metric singularity at the brane separating two
sliding superfluids | LaTeX file, 12 pages, 3 Figures, version accepted in JETP Letters | Pisma Zh.Eksp.Teor.Fiz. 76 (2002) 296-300; JETP Lett. 76 (2002)
240-244 | 10.1134/1.1520613 | null | gr-qc cond-mat hep-ph | null | An analog of black hole can be realized in the low-temperature laboratory.
The horizon can be constructed for the `relativistic' ripplons (surface waves)
living on the brane. The brane is represented by the interface between two
superfluid liquids, 3He-A and 3He-B, sliding along each other without friction.
Similar e... | [
{
"created": "Wed, 7 Aug 2002 15:00:31 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Aug 2002 12:52:11 GMT",
"version": "v2"
},
{
"created": "Tue, 27 Aug 2002 10:55:51 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Volovik",
"G. E.",
""
]
] | An analog of black hole can be realized in the low-temperature laboratory. The horizon can be constructed for the `relativistic' ripplons (surface waves) living on the brane. The brane is represented by the interface between two superfluid liquids, 3He-A and 3He-B, sliding along each other without friction. Similar exp... |
1610.06416 | Sergio Vitorino Borba Gon\c{c}alves | F. G. Alvarenga, L. G. Ferreira Filho, R. Fracalossi, R. C. Freitas,
S. V. B. Gon\c{c}alves, G. A. Monerat, G. Oliveira-Neto and E. V. Corr\^ea
Silva | Primordial Universe with radiation and Bose-Einstein condensate | 8 figures, 1 Table, 18 pages | Physics of the Dark Universe Volume 25, September 2019, 100325 | 10.1016/j.dark.2019.100325 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by-nc-sa/4.0/ | In this work we derive a scenario {in which} the early universe consists of
{radiation fluid} and Bose-Einstein condensate. The possibility of
gravitational self-interaction due to an attractive Bose-Einstein condensate is
analyzed. The classical behavior of the scale factor of the universe is
determined by a paramet... | [
{
"created": "Thu, 20 Oct 2016 13:54:26 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Dec 2018 12:44:58 GMT",
"version": "v2"
}
] | 2019-05-28 | [
[
"Alvarenga",
"F. G.",
""
],
[
"Filho",
"L. G. Ferreira",
""
],
[
"Fracalossi",
"R.",
""
],
[
"Freitas",
"R. C.",
""
],
[
"Gonçalves",
"S. V. B.",
""
],
[
"Monerat",
"G. A.",
""
],
[
"Oliveira-Neto",
"G.",
"... | In this work we derive a scenario {in which} the early universe consists of {radiation fluid} and Bose-Einstein condensate. The possibility of gravitational self-interaction due to an attractive Bose-Einstein condensate is analyzed. The classical behavior of the scale factor of the universe is determined by a parameter... |
gr-qc/0509048 | Shintaro Sawayama | Shintaro Sawayama | Dynamical horizon of evaporating black hole in Vaidya spacetime | 6 pages, 2 figures | Phys.Rev. D73 (2006) 064024 | 10.1103/PhysRevD.73.064024 | null | gr-qc | null | We consider how the mass of the black hole decreases by the Hawking radiation
in the Vaidya spacetime, using the concept of dynamical horizon equation,
proposed by Ashtekar and Krishnan. Using the formula for the change of the
dynamical horizon, we derive an equation for the mass incorporating the Hawking
radiation. ... | [
{
"created": "Wed, 14 Sep 2005 06:51:19 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Jan 2006 06:01:59 GMT",
"version": "v2"
}
] | 2013-05-29 | [
[
"Sawayama",
"Shintaro",
""
]
] | We consider how the mass of the black hole decreases by the Hawking radiation in the Vaidya spacetime, using the concept of dynamical horizon equation, proposed by Ashtekar and Krishnan. Using the formula for the change of the dynamical horizon, we derive an equation for the mass incorporating the Hawking radiation. It... |
2210.10788 | Alessandro Podo | Lam Hui, Alessandro Podo, Luca Santoni, Enrico Trincherini | An analytic approach to quasinormal modes for coupled linear systems | 30 pages. v2: matches published version | null | 10.1007/JHEP03(2023)060 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Quasinormal modes describe the ringdown of compact objects deformed by small
perturbations. In generic theories of gravity that extend General Relativity,
the linearized dynamics of these perturbations is described by a system of
coupled linear differential equations of second order. We first show, under
general assu... | [
{
"created": "Wed, 19 Oct 2022 18:00:00 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Oct 2023 19:53:21 GMT",
"version": "v2"
}
] | 2023-10-04 | [
[
"Hui",
"Lam",
""
],
[
"Podo",
"Alessandro",
""
],
[
"Santoni",
"Luca",
""
],
[
"Trincherini",
"Enrico",
""
]
] | Quasinormal modes describe the ringdown of compact objects deformed by small perturbations. In generic theories of gravity that extend General Relativity, the linearized dynamics of these perturbations is described by a system of coupled linear differential equations of second order. We first show, under general assump... |
1704.07093 | Takayuki Ohgami | Takayuki Ohgami and Nobuyuki Sakai | Wormhole Shadows in Rotating Dust | 9 pages, 7 figures. Published in Phys.Rev. D94 (2016) no.6, 064071 | Phys.Rev. D94 (2016) no.6, 064071 | 10.1103/PhysRevD.94.064071 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As an extension of our previous work, which investigated the shadows of the
Ellis wormhole surrounded by nonrotating dust, in this paper we study wormhole
shadows in rotating dust flow. First, we derive steady-state solutions of
slowly rotating dust surrounding the wormhole by solving relativistic Euler
equations. So... | [
{
"created": "Mon, 24 Apr 2017 08:53:03 GMT",
"version": "v1"
}
] | 2017-04-25 | [
[
"Ohgami",
"Takayuki",
""
],
[
"Sakai",
"Nobuyuki",
""
]
] | As an extension of our previous work, which investigated the shadows of the Ellis wormhole surrounded by nonrotating dust, in this paper we study wormhole shadows in rotating dust flow. First, we derive steady-state solutions of slowly rotating dust surrounding the wormhole by solving relativistic Euler equations. Solv... |
1408.4277 | Andrea Geralico | Donato Bini, Christian Cherubini, Simonetta Filippi, Andrea Geralico | C metric: the equatorial plane and Fermi coordinates | 11 pages, 1 figure; published version | Class. Quantum Grav. 22, 5157 (2005) | 10.1088/0264-9381/22/23/015 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss geodesic motion in the vacuum C metric using Bondi-like spherical
coordinates, with special attention to the role played by the "equatorial
plane." We show that the spatial trajectory of photons on such a hypersurface
is formally the same of photons on the equatorial plane of the Schwarzschild
spacetime, a... | [
{
"created": "Tue, 19 Aug 2014 10:08:05 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Bini",
"Donato",
""
],
[
"Cherubini",
"Christian",
""
],
[
"Filippi",
"Simonetta",
""
],
[
"Geralico",
"Andrea",
""
]
] | We discuss geodesic motion in the vacuum C metric using Bondi-like spherical coordinates, with special attention to the role played by the "equatorial plane." We show that the spatial trajectory of photons on such a hypersurface is formally the same of photons on the equatorial plane of the Schwarzschild spacetime, apa... |
gr-qc/9902067 | Wang Anzhong | M.L. Bedran, E.M. de S\'a, Anzhong Wang, and Yumei Wu | On the back reaction of gravitational and particle emission and
absorption from straight thick cosmic strings: A toy model | To appear in Gen. Relativ. Grav | Gen.Rel.Grav.31:1769-1776,1999 | 10.1023/A:1026770318472 | null | gr-qc | null | The emission and absorption of gravitational waves and massless particles of
an infinitely long straight cosmic string with finite thickness are studied. It
is shown in a general term that the back reaction of the emission and
absorption {\em always} makes the symmetry axis of the string singular. The
singularity is ... | [
{
"created": "Mon, 22 Feb 1999 13:35:35 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Oct 1999 19:40:23 GMT",
"version": "v2"
}
] | 2009-07-07 | [
[
"Bedran",
"M. L.",
""
],
[
"de Sá",
"E. M.",
""
],
[
"Wang",
"Anzhong",
""
],
[
"Wu",
"Yumei",
""
]
] | The emission and absorption of gravitational waves and massless particles of an infinitely long straight cosmic string with finite thickness are studied. It is shown in a general term that the back reaction of the emission and absorption {\em always} makes the symmetry axis of the string singular. The singularity is a ... |
2311.16802 | Kenta Hioki | Kenta Hioki and Umpei Miyamoto | Determining parameters of Kerr black holes at finite distance by shadow
observation | 28 pages, 6 figures, sec 5 added, accepted for publication in
Physical Review D; Supplemental material is attached. To view the attachment,
please download and extract the gzipped tar source file listed under "Other
formats'' | null | 10.1103/PhysRevD.109.044030 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new method to determine the physical parameters of Kerr black
holes (namely, specific angular momentum $a$, inclination angle $i$, and
distance $D$ from an observer) only from the shadow's information such as the
size and shape. Key points in our method are (i) to treat the distance as a
free parameter, ... | [
{
"created": "Tue, 28 Nov 2023 14:04:49 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Feb 2024 01:05:42 GMT",
"version": "v2"
}
] | 2024-02-20 | [
[
"Hioki",
"Kenta",
""
],
[
"Miyamoto",
"Umpei",
""
]
] | We propose a new method to determine the physical parameters of Kerr black holes (namely, specific angular momentum $a$, inclination angle $i$, and distance $D$ from an observer) only from the shadow's information such as the size and shape. Key points in our method are (i) to treat the distance as a free parameter, (i... |
1703.00601 | Maxim Lyutikov | Maxim Lyutikov (Purdue University, McGill University) | Rotation of polarization by a moving gravitational lens | null | Phys. Rev. D 95, 124003 (2017) | 10.1103/PhysRevD.95.124003 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a simple prescription for the rotation of polarization produced by
a relativistically moving gravitational lens, applicable to arbitrary
deflection angle and arbitrary velocity of the lens. When geometric optics is
applicable, two independent components contribute to the total rotation of
polarization: (i)... | [
{
"created": "Thu, 2 Mar 2017 03:32:19 GMT",
"version": "v1"
}
] | 2017-06-07 | [
[
"Lyutikov",
"Maxim",
"",
"Purdue University, McGill University"
]
] | We present a simple prescription for the rotation of polarization produced by a relativistically moving gravitational lens, applicable to arbitrary deflection angle and arbitrary velocity of the lens. When geometric optics is applicable, two independent components contribute to the total rotation of polarization: (i) i... |
1210.8308 | Juan Antonio Morales Lladosa | Ramon Lapiedra and Juan Antonio Morales-Lladosa | On the uniqueness of the space-time energy in General Relativity. The
illuminating case of the Schwarzschild metric | 17 pages, no figures. Some non essential but important modifications
to version 1 | General Relativity and Gravitation, 45: 1145 (2013) | 10.1007/s10714-013-1515-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The case of asymptotic Minkowskian space-times is considered. A special class
of asymptotic rectilinear coordinates at the spatial infinity, related to a
specific system of free falling observers, is chosen. This choice is applied in
particular to the Schwarzschild metric, obtaining a vanishing energy for this
space-... | [
{
"created": "Wed, 31 Oct 2012 12:20:20 GMT",
"version": "v1"
},
{
"created": "Thu, 16 May 2013 15:25:28 GMT",
"version": "v2"
}
] | 2013-05-17 | [
[
"Lapiedra",
"Ramon",
""
],
[
"Morales-Lladosa",
"Juan Antonio",
""
]
] | The case of asymptotic Minkowskian space-times is considered. A special class of asymptotic rectilinear coordinates at the spatial infinity, related to a specific system of free falling observers, is chosen. This choice is applied in particular to the Schwarzschild metric, obtaining a vanishing energy for this space-ti... |
1103.0824 | Franco Fiorini | Rafael Ferraro and Franco Fiorini | Non trivial frames for f(T) theories of gravity and beyond | 7 pages, 3 figures, some references added. Accepted for publication
in Phys. Lett. B. Final Version | Phys.Lett.B702:75-80,2011 | 10.1016/j.physletb.2011.06.049 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Some conceptual issues concerning $f(T)$ theories --a family of modified
gravity theories based on absolute parallelism-- are analyzed. Due to the lack
of local Lorentz invariance, the autoparallel frames satisfying the field
equations are evasive to an \emph{a priori} physical understanding. We
exemplify this point ... | [
{
"created": "Fri, 4 Mar 2011 05:00:10 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jun 2011 06:15:26 GMT",
"version": "v2"
},
{
"created": "Tue, 19 Jul 2011 04:19:42 GMT",
"version": "v3"
}
] | 2011-08-17 | [
[
"Ferraro",
"Rafael",
""
],
[
"Fiorini",
"Franco",
""
]
] | Some conceptual issues concerning $f(T)$ theories --a family of modified gravity theories based on absolute parallelism-- are analyzed. Due to the lack of local Lorentz invariance, the autoparallel frames satisfying the field equations are evasive to an \emph{a priori} physical understanding. We exemplify this point by... |
2004.10122 | Ednilton S. de Oliveira Ph.D. | Ednilton S. de Oliveira | Tidal-charge effects on the superradiance of rotating black holes | null | Eur. Phys. J. C 80, 1048 (2020) | 10.1140/epjc/s10052-020-08570-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The changes a (negative) tidal charge causes at the phenomenon of
superradiance which occurs around rotating black holes are investigated. This
is made by computing the amplification factors of massless scalar waves being
scattered by the black hole. It is shown that the increase of the tidal charge
intensity leads t... | [
{
"created": "Tue, 21 Apr 2020 16:05:03 GMT",
"version": "v1"
},
{
"created": "Mon, 18 May 2020 23:43:18 GMT",
"version": "v2"
}
] | 2020-11-18 | [
[
"de Oliveira",
"Ednilton S.",
""
]
] | The changes a (negative) tidal charge causes at the phenomenon of superradiance which occurs around rotating black holes are investigated. This is made by computing the amplification factors of massless scalar waves being scattered by the black hole. It is shown that the increase of the tidal charge intensity leads to ... |
1612.00674 | Che-Yu Chen | Frederico Arroja, Che-Yu Chen, Pisin Chen and Dong-han Yeom | Singular Instantons in Eddington-inspired-Born-Infeld Gravity | 23 pages, version accepted in JCAP | JCAP 03 (2017) 044 | 10.1088/1475-7516/2017/03/044 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we investigate $O(4)$-symmetric instantons within the
Eddington-inspired-Born-Infeld gravity theory (EiBI). We discuss the regular
Hawking-Moss instanton and find that the tunneling rate reduces to the General
Relativity (GR) value, even though the action value is different by a constant.
We give a thor... | [
{
"created": "Fri, 2 Dec 2016 13:29:46 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Mar 2017 14:15:02 GMT",
"version": "v2"
}
] | 2017-03-27 | [
[
"Arroja",
"Frederico",
""
],
[
"Chen",
"Che-Yu",
""
],
[
"Chen",
"Pisin",
""
],
[
"Yeom",
"Dong-han",
""
]
] | In this work, we investigate $O(4)$-symmetric instantons within the Eddington-inspired-Born-Infeld gravity theory (EiBI). We discuss the regular Hawking-Moss instanton and find that the tunneling rate reduces to the General Relativity (GR) value, even though the action value is different by a constant. We give a thorou... |
gr-qc/0308023 | Samuel V\'azquez | Samuel E. V\'azquez, Ernesto P. Esteban | Strong Field Gravitational Lensing by a Kerr Black Hole | ReVTeX, 19 pages, 10 figures and 7 tables. Final version with some
grammatical changes to abstract and text (equations left unchanged).
Submitted to PRD | Nuovo Cim.B119:489-519,2004 | 10.1393/ncb/i2004-10121-y | null | gr-qc | null | We consider a Kerr black hole acting as a gravitational deflector within the
geometrical optics, and point source approximations. The Kerr black hole
gravitational lens geometry consisting of an observer and a source located far
away and placed at arbitrary inclinations with respect to the black hole's
equatorial pla... | [
{
"created": "Fri, 8 Aug 2003 03:42:24 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Sep 2003 23:10:27 GMT",
"version": "v2"
}
] | 2010-11-11 | [
[
"Vázquez",
"Samuel E.",
""
],
[
"Esteban",
"Ernesto P.",
""
]
] | We consider a Kerr black hole acting as a gravitational deflector within the geometrical optics, and point source approximations. The Kerr black hole gravitational lens geometry consisting of an observer and a source located far away and placed at arbitrary inclinations with respect to the black hole's equatorial plane... |
1905.11674 | Jian-dong Zhang | Jiahui Bao, Changfu Shi, Haitian Wang, Jian-dong Zhang, Yiming Hu,
Jianwei Mei, Jun Luo | Constraining modified gravity with ringdown signals: an explicit example | 7 pages, 4 figures, 4 tables, matches the published version | Phys. Rev. D 100, 084024 (2019) | 10.1103/PhysRevD.100.084024 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An explicit example is found showing how a modified theory of gravity can be
constrained with the ringdown signals from merger of binary black holes. This
has been made possible by the fact that the modified gravitational theory
considered in this work has an exact rotating black hole solution and that the
correspond... | [
{
"created": "Tue, 28 May 2019 08:29:10 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Oct 2019 01:08:41 GMT",
"version": "v2"
}
] | 2019-10-23 | [
[
"Bao",
"Jiahui",
""
],
[
"Shi",
"Changfu",
""
],
[
"Wang",
"Haitian",
""
],
[
"Zhang",
"Jian-dong",
""
],
[
"Hu",
"Yiming",
""
],
[
"Mei",
"Jianwei",
""
],
[
"Luo",
"Jun",
""
]
] | An explicit example is found showing how a modified theory of gravity can be constrained with the ringdown signals from merger of binary black holes. This has been made possible by the fact that the modified gravitational theory considered in this work has an exact rotating black hole solution and that the correspondin... |
2208.08830 | Salih Kibaro\u{g}lu | Salih Kibaro\u{g}lu | GUP-corrected $\Lambda$CDM cosmology | 5 pages | Sakarya University Journal of Science, 26(3), 501-509, 2022 | 10.16984/saufenbilder.1033550 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this study, we investigate the effect of the generalized uncertainty
principle on the $\Lambda$CDM cosmological model. Using quantum corrected Unruh
effect and Verlinde's entropic gravity idea, we find Planck-scale corrected
Friedmann equations with a cosmological constant. These results modify the
$\Lambda$CDM co... | [
{
"created": "Thu, 18 Aug 2022 13:46:17 GMT",
"version": "v1"
}
] | 2022-08-19 | [
[
"Kibaroğlu",
"Salih",
""
]
] | In this study, we investigate the effect of the generalized uncertainty principle on the $\Lambda$CDM cosmological model. Using quantum corrected Unruh effect and Verlinde's entropic gravity idea, we find Planck-scale corrected Friedmann equations with a cosmological constant. These results modify the $\Lambda$CDM cosm... |
1702.08220 | Ozay Gurtug | Ozay Gurtug and M. Mangut | Quantum Probe of Ho\v{r}ava-Lifshitz Gravity | 15 pages no figures, revised version with new title, accepted for
publication in JMP | null | 10.1063/1.5001114 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Particle probe analysis of the Kehagias - Sfetsos black hole spacetime of Ho%
\v{r}ava-Lifshitz gravity is extended to wave probe analysis within the
framework of quantum mechanics. The timelike naked singularity that develops
when $\omega M^{2}<1/2$, is probed with quantum fields obeying Klein-Gordon and
Chandrasekh... | [
{
"created": "Mon, 27 Feb 2017 10:18:51 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Apr 2018 10:57:53 GMT",
"version": "v2"
}
] | 2018-05-09 | [
[
"Gurtug",
"Ozay",
""
],
[
"Mangut",
"M.",
""
]
] | Particle probe analysis of the Kehagias - Sfetsos black hole spacetime of Ho% \v{r}ava-Lifshitz gravity is extended to wave probe analysis within the framework of quantum mechanics. The timelike naked singularity that develops when $\omega M^{2}<1/2$, is probed with quantum fields obeying Klein-Gordon and Chandrasekhar... |
2205.08949 | Sergey Sushkov V | Pavel E. Kashargin, Sergey V. Sushkov | Anti-de Sitter neutron stars in the theory of gravity with nonminimal
derivative coupling | null | null | 10.1088/1475-7516/2023/01/005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider neutron star configurations in the scalar-tensor theory of
gravity with the coupling between the kinetic term of a scalar field and the
Einstein tensor (such the model is a subclass of Horndeski gravity). Neutron
stars in this model were studied earlier for the special case with a vanishing
``bare'' cosmo... | [
{
"created": "Wed, 18 May 2022 14:24:29 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Sep 2022 08:59:42 GMT",
"version": "v2"
},
{
"created": "Sun, 4 Dec 2022 15:31:46 GMT",
"version": "v3"
}
] | 2023-01-18 | [
[
"Kashargin",
"Pavel E.",
""
],
[
"Sushkov",
"Sergey V.",
""
]
] | We consider neutron star configurations in the scalar-tensor theory of gravity with the coupling between the kinetic term of a scalar field and the Einstein tensor (such the model is a subclass of Horndeski gravity). Neutron stars in this model were studied earlier for the special case with a vanishing ``bare'' cosmolo... |
gr-qc/9902043 | Forough Naseri | Reza Mansouri, Forough Nasseri | A model Universe with variable space dimension: its dynamics and wave
function | 37 pages, 7 ps figuers, latex file | Phys.Rev.D60:123512,1999 | 10.1103/PhysRevD.60.123512 | IPM/P-99/7 | gr-qc astro-ph | null | Assuming the space dimension is not constant, but varies with the expansion
of the Universe, a Lagrangian formulation for a toy model Universe is given.
There is a free paremeter in the theory, $C$, with which we can fix the
dimension of space at the Planck time. The standard FRW model corresponds to
the limiting cas... | [
{
"created": "Sun, 14 Feb 1999 07:20:05 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Mansouri",
"Reza",
""
],
[
"Nasseri",
"Forough",
""
]
] | Assuming the space dimension is not constant, but varies with the expansion of the Universe, a Lagrangian formulation for a toy model Universe is given. There is a free paremeter in the theory, $C$, with which we can fix the dimension of space at the Planck time. The standard FRW model corresponds to the limiting case ... |
1006.4605 | Vladimir Ivashchuk | V.D. Ivashchuk | Spherically-symmetric solutions with a chain of n internal Ricci-flat
spaces | 5 pages, Latex | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Schwarzschild solution is generalized for the case of n internal
Ricci-flat spaces. It is shown that in the four-dimensional section of the
metric a horizon exists only when the internal space scale factors are
constant. The scalar-vacuum generalization of the solution is also presented.
[This paper is the Englis... | [
{
"created": "Wed, 23 Jun 2010 18:14:38 GMT",
"version": "v1"
}
] | 2011-04-19 | [
[
"Ivashchuk",
"V. D.",
""
]
] | The Schwarzschild solution is generalized for the case of n internal Ricci-flat spaces. It is shown that in the four-dimensional section of the metric a horizon exists only when the internal space scale factors are constant. The scalar-vacuum generalization of the solution is also presented. [This paper is the English ... |
gr-qc/9708056 | J. Frauendiener | J. Frauendiener | On an integral formula on hypersurfaces in General Relativity | LaTeX file, 13 pages, submitted to Class. Quant. Grav | Class.Quant.Grav. 14 (1997) 3413-3423 | 10.1088/0264-9381/14/12/023 | null | gr-qc | null | We derive a general integral formula on an embedded hypersurface for general
relativistic space-times. Suppose the hypersurface is foliated by
two-dimensional compact ``sections'' $S_s$. Then the formula relates the rate
of change of the divergence of outgoing light rays integrated over $S_s$ under
change of section ... | [
{
"created": "Sat, 23 Aug 1997 12:34:55 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Frauendiener",
"J.",
""
]
] | We derive a general integral formula on an embedded hypersurface for general relativistic space-times. Suppose the hypersurface is foliated by two-dimensional compact ``sections'' $S_s$. Then the formula relates the rate of change of the divergence of outgoing light rays integrated over $S_s$ under change of section to... |
gr-qc/0502077 | Yihuan Wei | Yi-Huan Wei | Big Rip in SO(1,1) phantom universe | 10 pages, 1 figure | null | null | null | gr-qc | null | For the inverse linear potential, the SO(1,1) field behaves as phantom for
late time and the Big Rip will occur. The field approaches zero as time
approaches the Big Rip, here. For this potential the phantom equation of state
takes the late-time minimum $w_\Phi=-3$. We give some discussions that the Big
Rip in the SO... | [
{
"created": "Thu, 17 Feb 2005 12:36:31 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wei",
"Yi-Huan",
""
]
] | For the inverse linear potential, the SO(1,1) field behaves as phantom for late time and the Big Rip will occur. The field approaches zero as time approaches the Big Rip, here. For this potential the phantom equation of state takes the late-time minimum $w_\Phi=-3$. We give some discussions that the Big Rip in the SO(1... |
2308.03728 | Gregory J. Galloway | Gregory J. Galloway | Remarks on the size of apparent horizons | 10 pages. v2: minor changes/corrections, reference added | null | null | null | gr-qc math.DG | http://creativecommons.org/licenses/by/4.0/ | Marginally outer trapped surfaces (also referred to as apparent horizons)
that are stable in 3-dimensional initial data sets obeying the dominant energy
condition strictly are known to satisfy an area bound. The main purpose of this
note is to show (in several ways) that such surfaces also satisfy a diameter
bound.
| [
{
"created": "Mon, 7 Aug 2023 17:17:04 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Aug 2023 13:07:48 GMT",
"version": "v2"
}
] | 2023-08-16 | [
[
"Galloway",
"Gregory J.",
""
]
] | Marginally outer trapped surfaces (also referred to as apparent horizons) that are stable in 3-dimensional initial data sets obeying the dominant energy condition strictly are known to satisfy an area bound. The main purpose of this note is to show (in several ways) that such surfaces also satisfy a diameter bound. |
1012.2445 | Mikhail Iofa | Mikhail Z. Iofa | Graviton emission from the brane in the bulk in a model with extra
dimension | 26 pages, LaTeX Published version with small modifications | JCAP06(2011)025 | 10.1088/1475-7516/2011/06/025 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a model of 3-brane embedded in 5D space-time we calculate the graviton
emission from the brane to the bulk. Matter is confined to the brane, gravitons
produced in reactions of matter on the brane escape to the bulk. The Einstein
equations which are modified by the terms due to graviton production are solved
pertur... | [
{
"created": "Sat, 11 Dec 2010 10:50:50 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Feb 2011 13:26:36 GMT",
"version": "v2"
},
{
"created": "Wed, 28 Sep 2011 11:09:17 GMT",
"version": "v3"
}
] | 2015-05-20 | [
[
"Iofa",
"Mikhail Z.",
""
]
] | In a model of 3-brane embedded in 5D space-time we calculate the graviton emission from the brane to the bulk. Matter is confined to the brane, gravitons produced in reactions of matter on the brane escape to the bulk. The Einstein equations which are modified by the terms due to graviton production are solved perturba... |
2105.02687 | Ujjal Debnath | Ujjal Debnath and Soumak Nag | Anisotropic Multiverse with Varying $c$, $G$ and Study of Thermodynamics | 8 pages | null | null | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | We assume the anisotropic model of the Universe in the framework of varying
speed of light $c$ and varying gravitational constant $G$ theories and study
different types of singularities. For the singularity models, we write the
scale factors in terms of cosmic time and found some conditions for possible
singularities... | [
{
"created": "Wed, 5 May 2021 11:58:34 GMT",
"version": "v1"
}
] | 2021-05-07 | [
[
"Debnath",
"Ujjal",
""
],
[
"Nag",
"Soumak",
""
]
] | We assume the anisotropic model of the Universe in the framework of varying speed of light $c$ and varying gravitational constant $G$ theories and study different types of singularities. For the singularity models, we write the scale factors in terms of cosmic time and found some conditions for possible singularities. ... |
1704.02022 | Huan Yang | Huan Yang, Marc Casals | General Relativistic Dynamics of an Extreme Mass-Ratio Binary
interacting with an External Body | 12 pages, 3 figures, published version | Phys. Rev. D 96, 083015 (2017) | 10.1103/PhysRevD.96.083015 | null | gr-qc astro-ph.GA astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the dynamics of a hierarchical three-body system in the
general-relativistic regime: an extreme mass-ratio inner binary under the tidal
influence of an external body. The inner binary consists of a central
Schwarzschild black hole and a compact test body moving around it (outer
binary). We discover three typ... | [
{
"created": "Thu, 6 Apr 2017 21:04:22 GMT",
"version": "v1"
},
{
"created": "Sat, 9 Sep 2017 15:01:20 GMT",
"version": "v2"
},
{
"created": "Thu, 26 Oct 2017 17:26:16 GMT",
"version": "v3"
}
] | 2017-11-01 | [
[
"Yang",
"Huan",
""
],
[
"Casals",
"Marc",
""
]
] | We study the dynamics of a hierarchical three-body system in the general-relativistic regime: an extreme mass-ratio inner binary under the tidal influence of an external body. The inner binary consists of a central Schwarzschild black hole and a compact test body moving around it (outer binary). We discover three types... |
1811.12909 | Antonio Pereira Jr | Astrid Eichhorn, Tim Koslowski, Antonio D. Pereira | Status of background-independent coarse-graining in tensor models for
quantum gravity | 28 pages, Review prepared for the special issue "Progress in Group
Field Theory and Related Quantum Gravity Formalisms" in "Universe" | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A background-independent route towards a universal continuum limit in
discrete models of quantum gravity proceeds through a background-independent
form of coarse graining. This review provides a pedagogical introduction to the
conceptual ideas underlying the use of the number of degrees of freedom as a
scale for a Re... | [
{
"created": "Fri, 30 Nov 2018 17:49:41 GMT",
"version": "v1"
}
] | 2018-12-03 | [
[
"Eichhorn",
"Astrid",
""
],
[
"Koslowski",
"Tim",
""
],
[
"Pereira",
"Antonio D.",
""
]
] | A background-independent route towards a universal continuum limit in discrete models of quantum gravity proceeds through a background-independent form of coarse graining. This review provides a pedagogical introduction to the conceptual ideas underlying the use of the number of degrees of freedom as a scale for a Reno... |
1807.08391 | Edward Anderson | Edward Anderson | $N$-Body Problem: Minimal $N$'s for Qualitative Nontrivialities | 59 pages including 27 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the $N$-Body Problem in arbitrary dimension $d$ at the kinematical
level, with modelling Background Independence in mind. In particular, we give a
structural analysis of its reduced configuration spaces, decomposing this
subject matter into basic Topology, Geometry, Group Theory, Linear Algebra,
Graph Theor... | [
{
"created": "Mon, 23 Jul 2018 00:36:38 GMT",
"version": "v1"
}
] | 2018-07-24 | [
[
"Anderson",
"Edward",
""
]
] | We review the $N$-Body Problem in arbitrary dimension $d$ at the kinematical level, with modelling Background Independence in mind. In particular, we give a structural analysis of its reduced configuration spaces, decomposing this subject matter into basic Topology, Geometry, Group Theory, Linear Algebra, Graph Theory ... |
0907.0846 | Parthasarathi Majumdar | Rudranil Basu, Romesh K. Kaul and Parthasarathi Majumdar | Entropy of Isolated Horizons revisited | 8 Pages Latex, no figures; penultimate paragraph on invariance of
equations satisfied by IH states, under action of Gauss law constraint,
modified | Phys.Rev.D82:024007,2010 | 10.1103/PhysRevD.82.024007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The decade-old formulation of the isolated horizon classically and within
loop quantum gravity, and the extraction of the microcanonical entropy of such
a horizon from this formulation, is reviewed, in view of recent renewed
interest. There are two main approaches to this problem: one employs an SU(2)
Chern-Simons th... | [
{
"created": "Sun, 5 Jul 2009 11:09:12 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Jul 2009 13:14:28 GMT",
"version": "v2"
},
{
"created": "Wed, 29 Jul 2009 14:07:44 GMT",
"version": "v3"
}
] | 2014-11-20 | [
[
"Basu",
"Rudranil",
""
],
[
"Kaul",
"Romesh K.",
""
],
[
"Majumdar",
"Parthasarathi",
""
]
] | The decade-old formulation of the isolated horizon classically and within loop quantum gravity, and the extraction of the microcanonical entropy of such a horizon from this formulation, is reviewed, in view of recent renewed interest. There are two main approaches to this problem: one employs an SU(2) Chern-Simons theo... |
gr-qc/0009053 | Nelson Pantoja V. | N. R. Pantoja, H. Rago | Distributional Sources in General Relativity: two point-like examples
revisited | Final version, with minor changes, to appear in Int. J. Mod. Phys. D | Int.J.Mod.Phys.D11:1479-1500,2002 | 10.1142/S021827180200213X | null | gr-qc | null | A regularization procedure, that allows one to relate singularities of
curvature to those of the Einstein tensor without some of the shortcomings of
previous approaches, is proposed. This regularization is obtained by requiring
that (i) the density $|det {\bf g}|^{{1/2}}G^a_{b}$, associated to the Einstein
tensor $G^... | [
{
"created": "Thu, 14 Sep 2000 23:13:01 GMT",
"version": "v1"
},
{
"created": "Tue, 21 May 2002 22:53:30 GMT",
"version": "v2"
}
] | 2011-08-11 | [
[
"Pantoja",
"N. R.",
""
],
[
"Rago",
"H.",
""
]
] | A regularization procedure, that allows one to relate singularities of curvature to those of the Einstein tensor without some of the shortcomings of previous approaches, is proposed. This regularization is obtained by requiring that (i) the density $|det {\bf g}|^{{1/2}}G^a_{b}$, associated to the Einstein tensor $G^a_... |
2111.14359 | Jos\'e Enrique Hern\'andez Ram\'irez | J. Enrique H. Ram\'irez | An approach of the interior of a black hole type Schwarzschild | 14 figures, 20 pages | null | 10.21203/rs.3rs-710780/v1 | Mon, 06 Dec 2021 06:08 EST | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Our goal in this paper is to explain the internal properties of the black
hole by considering its density as a function of the reciprocal of its radius
and the temperature as a function of the reciprocal of the density. We then set
the temperature to the Hawking temperature. This gives all the macroscopic
quantities ... | [
{
"created": "Mon, 29 Nov 2021 07:30:22 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Dec 2021 12:29:54 GMT",
"version": "v2"
},
{
"created": "Mon, 6 Dec 2021 11:13:58 GMT",
"version": "v3"
}
] | 2021-12-07 | [
[
"Ramírez",
"J. Enrique H.",
""
]
] | Our goal in this paper is to explain the internal properties of the black hole by considering its density as a function of the reciprocal of its radius and the temperature as a function of the reciprocal of the density. We then set the temperature to the Hawking temperature. This gives all the macroscopic quantities of... |
2002.09483 | Massimo Mannarelli | Francesco Di Clemente, Massimo Mannarelli and Francesco Tonelli | A reliable description of the radial oscillations of compact stars | 13 pages, 8 figures | Phys. Rev. D 101, 103003 (2020) | 10.1103/PhysRevD.101.103003 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a numerical algorithm for the solution of the Sturm-Liouville
differential equation governing the stationary radial oscillations of
nonrotating compact stars. Our method is based on the Numerov's method that
turns the Sturm-Liouville differential equation in an eigenvalue problem. In
our development we pro... | [
{
"created": "Fri, 21 Feb 2020 19:48:11 GMT",
"version": "v1"
}
] | 2020-05-06 | [
[
"Di Clemente",
"Francesco",
""
],
[
"Mannarelli",
"Massimo",
""
],
[
"Tonelli",
"Francesco",
""
]
] | We develop a numerical algorithm for the solution of the Sturm-Liouville differential equation governing the stationary radial oscillations of nonrotating compact stars. Our method is based on the Numerov's method that turns the Sturm-Liouville differential equation in an eigenvalue problem. In our development we provi... |
1901.09624 | Yungui Gong | Dicong Liang, Yungui Gong, Alan J. Weinstein, Chao Zhang, Chunyu Zhang | Frequency response of space-based interferometric gravitational-wave
detectors | V3: minor corrections. PRD in press | Phys. Rev. D 99, 104027 (2019) | 10.1103/PhysRevD.99.104027 | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waves are perturbations of the metric of space-time. Six
polarizations are possible, although general relativity predicts that only two
such polarizations, tensor plus and tensor cross are present for gravitational
waves. We give the analytical formulas for the antenna response functions for
the six pol... | [
{
"created": "Mon, 28 Jan 2019 12:25:13 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Feb 2019 04:07:19 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Apr 2019 03:47:30 GMT",
"version": "v3"
}
] | 2019-05-16 | [
[
"Liang",
"Dicong",
""
],
[
"Gong",
"Yungui",
""
],
[
"Weinstein",
"Alan J.",
""
],
[
"Zhang",
"Chao",
""
],
[
"Zhang",
"Chunyu",
""
]
] | Gravitational waves are perturbations of the metric of space-time. Six polarizations are possible, although general relativity predicts that only two such polarizations, tensor plus and tensor cross are present for gravitational waves. We give the analytical formulas for the antenna response functions for the six polar... |
1612.05604 | Ednilton S. de Oliveira Ph.D. | C\'assio I. S. Marinho and Ednilton S. de Oliveira | Scattering of massless scalar waves from Schwarzschild-Tangherlini black
holes on the brane | null | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The scalar scattering cross section is computed for Schwarzschild-Tangherlini
black holes on the brane. The cross sections are computed numerically via the
partial-wave method. The phase shifts are found numerically and also via the
Born approximation. It is shown that spacetimes with more than six dimensions
present... | [
{
"created": "Fri, 16 Dec 2016 19:36:09 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Jan 2017 21:41:09 GMT",
"version": "v2"
}
] | 2017-01-13 | [
[
"Marinho",
"Cássio I. S.",
""
],
[
"de Oliveira",
"Ednilton S.",
""
]
] | The scalar scattering cross section is computed for Schwarzschild-Tangherlini black holes on the brane. The cross sections are computed numerically via the partial-wave method. The phase shifts are found numerically and also via the Born approximation. It is shown that spacetimes with more than six dimensions present a... |
1904.11205 | Klaus Kassner | Klaus Kassner | Reduction of a family of metric gravities | 3 figures. Submitted to European Physical Journal Plus on 16/04/19,
accepted on 02/05/2019. This version corresponds to the preprint with some
grammatical corrections added. In the journal version, titles have been
removed from references, so the arXiv version gives more complete references.
Otherwise, there ar... | Eur. Phys. J. Plus (2019) 134: 366 | 10.1140/epjp/i2019-12722-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recent proposal by Shuler regarding a postulate-based derivation of a
family of metrics describing the gravitational field outside a static
spherically symmetric mass distribution is reviewed. All of Shuler's gravities
agree with the Schwarzschild solution in the weak-field limit, but they differ
in the strong-fiel... | [
{
"created": "Thu, 25 Apr 2019 08:30:38 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Jul 2019 16:15:14 GMT",
"version": "v2"
}
] | 2019-07-26 | [
[
"Kassner",
"Klaus",
""
]
] | A recent proposal by Shuler regarding a postulate-based derivation of a family of metrics describing the gravitational field outside a static spherically symmetric mass distribution is reviewed. All of Shuler's gravities agree with the Schwarzschild solution in the weak-field limit, but they differ in the strong-field ... |
2206.11617 | Michael J. W. Hall | Michael J. W. Hall | Simple precession calculation for Mercury: a linearization approach | 4 pages, submitted to Am J Phys | Am. J. Phys. 90 (2022) 857-860 | null | null | gr-qc physics.ed-ph | http://creativecommons.org/licenses/by/4.0/ | The additional precession of Mercury due to general relativity can be
calculated by a method that is no more difficult than solving for the Newtonian
orbit. The method relies on linearizing the relativistic orbit equation, is
simpler than standard textbook methods, and is closely related to Newton's
theorem on revolv... | [
{
"created": "Thu, 23 Jun 2022 10:57:47 GMT",
"version": "v1"
}
] | 2022-10-27 | [
[
"Hall",
"Michael J. W.",
""
]
] | The additional precession of Mercury due to general relativity can be calculated by a method that is no more difficult than solving for the Newtonian orbit. The method relies on linearizing the relativistic orbit equation, is simpler than standard textbook methods, and is closely related to Newton's theorem on revolvin... |
2010.04857 | Jose Wadih Maluf Dr. | J. W. Maluf and S. C. Ulhoa | A teleparallel type theory for massless spin 2 fields | 14 pages, no figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the Lagrangian and Hamiltonian formulations of a theory for spin 2
fields. The construction is developed in flat space-time. The construction in
curved space-time is conceptually straightforward, although it is not unique.
The theory is based on a symmetric tensor $S_{\mu\nu}$, contains two degrees of
free... | [
{
"created": "Sat, 10 Oct 2020 01:03:30 GMT",
"version": "v1"
}
] | 2020-10-13 | [
[
"Maluf",
"J. W.",
""
],
[
"Ulhoa",
"S. C.",
""
]
] | We present the Lagrangian and Hamiltonian formulations of a theory for spin 2 fields. The construction is developed in flat space-time. The construction in curved space-time is conceptually straightforward, although it is not unique. The theory is based on a symmetric tensor $S_{\mu\nu}$, contains two degrees of freedo... |
1702.01429 | Bala Subramanian | Chethan Krishnan, Shubham Maheshwari, P. N. Bala Subramanian | Robin Gravity | 10 pages. Contribution to the proceedings of the IF-YITP Symposium
VI, Phitsanulok, Thailand. Aug 3-5, 2016. v2: very minor corrections to the
proceedings published version | null | 10.1088/1742-6596/883/1/012011 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We write down a Robin boundary term for general relativity. The construction
relies on the Neumann result of arXiv:1605.01603 in an essential way. This is
unlike in mechanics and (polynomial) field theory, where two formulations of
the Robin problem exist: one with Dirichlet as the natural limiting case, and
another ... | [
{
"created": "Sun, 5 Feb 2017 16:48:51 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Sep 2017 10:05:16 GMT",
"version": "v2"
}
] | 2017-09-13 | [
[
"Krishnan",
"Chethan",
""
],
[
"Maheshwari",
"Shubham",
""
],
[
"Subramanian",
"P. N. Bala",
""
]
] | We write down a Robin boundary term for general relativity. The construction relies on the Neumann result of arXiv:1605.01603 in an essential way. This is unlike in mechanics and (polynomial) field theory, where two formulations of the Robin problem exist: one with Dirichlet as the natural limiting case, and another wi... |
2012.14306 | Hamed Barzegar | Hamed Barzegar | Future attractors of Bianchi types II and V cosmologies with massless
Vlasov matter | Some minor typos are corrected in the new version | null | 10.1088/1361-6382/abe49a | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that the generalized Collins--Stewart radiation and Milne
solutions are attractors of the massless Einstein--Vlasov system for Bianchi
types II and V spacetimes, respectively. The proof is based on an energy method
and bootstrap argument which are used to determine the decay rates of the
perturbations awa... | [
{
"created": "Mon, 28 Dec 2020 15:43:06 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Feb 2021 12:28:00 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Nov 2021 10:10:04 GMT",
"version": "v3"
}
] | 2021-11-29 | [
[
"Barzegar",
"Hamed",
""
]
] | It is shown that the generalized Collins--Stewart radiation and Milne solutions are attractors of the massless Einstein--Vlasov system for Bianchi types II and V spacetimes, respectively. The proof is based on an energy method and bootstrap argument which are used to determine the decay rates of the perturbations away ... |
2406.11932 | Xiao-Mei Kuang | Xiao-Mei Kuang, Yuan Meng, Eleftherios Papantonopoulos, Xi-Jing Wang | Using shadow of black hole to examine the energy exchange between axion
matter and rotating black hole | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We find that a \textit{slowly} rotating axion-modified black hole resulting
from the backreaction of an axion field on a rotating Kerr black hole can have
a \textit{D-shaped} shadow as that for a \textit{highly} counter-rotating Kerr
black hole. This attributes to the fact that the energy exchange between the
axion m... | [
{
"created": "Mon, 17 Jun 2024 14:47:38 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jun 2024 08:19:59 GMT",
"version": "v2"
}
] | 2024-06-26 | [
[
"Kuang",
"Xiao-Mei",
""
],
[
"Meng",
"Yuan",
""
],
[
"Papantonopoulos",
"Eleftherios",
""
],
[
"Wang",
"Xi-Jing",
""
]
] | We find that a \textit{slowly} rotating axion-modified black hole resulting from the backreaction of an axion field on a rotating Kerr black hole can have a \textit{D-shaped} shadow as that for a \textit{highly} counter-rotating Kerr black hole. This attributes to the fact that the energy exchange between the axion mat... |
1711.07403 | David Langlois | David Langlois, Ryo Saito, Daisuke Yamauchi, Karim Noui | Scalar-tensor theories and modified gravity in the wake of GW170817 | 5 pages; no figure; coincides with published version | Phys. Rev. D 97, 061501 (2018) | 10.1103/PhysRevD.97.061501 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Theories of dark energy and modified gravity can be strongly constrained by
astrophysical or cosmological observations, as illustrated by the recent
observation of the gravitational wave event GW170817 and of its electromagnetic
counterpart GRB 170817A, which shows that the speed of gravitational waves,
$c_g$, is the... | [
{
"created": "Mon, 20 Nov 2017 16:46:27 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Nov 2018 14:26:05 GMT",
"version": "v2"
}
] | 2018-11-02 | [
[
"Langlois",
"David",
""
],
[
"Saito",
"Ryo",
""
],
[
"Yamauchi",
"Daisuke",
""
],
[
"Noui",
"Karim",
""
]
] | Theories of dark energy and modified gravity can be strongly constrained by astrophysical or cosmological observations, as illustrated by the recent observation of the gravitational wave event GW170817 and of its electromagnetic counterpart GRB 170817A, which shows that the speed of gravitational waves, $c_g$, is the s... |
1206.2439 | S. Davood Sadatian | S. Davood Sadatian | Considering Late-Time Acceleration in some Cosmological Models | 14 pages, 10 figures, Accepted for Publication in Adv. High Energy
Phys | Advances in High Energy Physics, 2013, 802685, (2013) | 10.1155/2013/802685 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study two cosmological models: A non-minimally coupled scalar field on
brane world model and a minimally coupled scalar field on Lorentz invariance
violation model. We compare some cosmological results in these scenarios. Also,
we consider some types of Rip singularity solution in both models.
| [
{
"created": "Tue, 12 Jun 2012 04:38:24 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jun 2012 16:01:09 GMT",
"version": "v2"
},
{
"created": "Sat, 16 Mar 2013 18:09:33 GMT",
"version": "v3"
},
{
"created": "Tue, 19 Mar 2013 07:30:52 GMT",
"version": "v4"
}
] | 2013-04-22 | [
[
"Sadatian",
"S. Davood",
""
]
] | We study two cosmological models: A non-minimally coupled scalar field on brane world model and a minimally coupled scalar field on Lorentz invariance violation model. We compare some cosmological results in these scenarios. Also, we consider some types of Rip singularity solution in both models. |
1312.6665 | S Habib Mazharimousavi | M. Halilsoy, A. Ovgun and S. Habib Mazharimousavi | Thin-shell wormholes from the regular Hayward black hole | 7 pages 5 figures, extended version | Eur. Phys. J. C (2014) 74:2796 | 10.1140/epjc/s10052-014-2796-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the regular black hole found by Hayward in $4-$dimensional static,
spherically symmetric spacetime. To find a possible source for such a spacetime
we resort to the non-linear electrodynamics in general relativity. It is found
that a magnetic field within this context gives rise to the regular Hayward
black... | [
{
"created": "Thu, 12 Dec 2013 21:32:40 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Dec 2013 18:22:27 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Feb 2014 09:45:30 GMT",
"version": "v3"
}
] | 2014-03-17 | [
[
"Halilsoy",
"M.",
""
],
[
"Ovgun",
"A.",
""
],
[
"Mazharimousavi",
"S. Habib",
""
]
] | We revisit the regular black hole found by Hayward in $4-$dimensional static, spherically symmetric spacetime. To find a possible source for such a spacetime we resort to the non-linear electrodynamics in general relativity. It is found that a magnetic field within this context gives rise to the regular Hayward black h... |
gr-qc/0211031 | Glenn Barnich | Glenn Barnich | Conserved charges in gravitational theories: contribution from scalar
fields | 4 pages Latex file, Proceedings of the Third International Sakharov
Conference on Physics (June 24-29, 2002, Moscow) | null | null | ULB-TH/02-32 | gr-qc hep-th | null | In order to illustrate a recently derived covariant formalism for computing
asymptotic symmetries and asymptotically conserved superpotentials in gauge
theories, the case of gravity with minimally coupled scalar fields is
considered and the matter contribution to the asymptotically conserved
superpotentials is comput... | [
{
"created": "Sun, 10 Nov 2002 20:54:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Barnich",
"Glenn",
""
]
] | In order to illustrate a recently derived covariant formalism for computing asymptotic symmetries and asymptotically conserved superpotentials in gauge theories, the case of gravity with minimally coupled scalar fields is considered and the matter contribution to the asymptotically conserved superpotentials is computed... |
gr-qc/9210010 | James B. Hartle | Murray Gell-Mann and James B. Hartle | Classical Equations for Quantum Systems | 100pages, 1 figure | Phys.Rev.D47:3345-3382,1993 | 10.1103/PhysRevD.47.3345 | UCSBTH-91-15 | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The origin of the phenomenological deterministic laws that approximately
govern the quasiclassical domain of familiar experience is considered in the
context of the quantum mechanics of closed systems such as the universe as a
whole. We investigate the requirements for coarse grainings to yield decoherent
sets of his... | [
{
"created": "Wed, 21 Oct 1992 01:07:17 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Jan 2014 22:29:18 GMT",
"version": "v2"
}
] | 2014-01-15 | [
[
"Gell-Mann",
"Murray",
""
],
[
"Hartle",
"James B.",
""
]
] | The origin of the phenomenological deterministic laws that approximately govern the quasiclassical domain of familiar experience is considered in the context of the quantum mechanics of closed systems such as the universe as a whole. We investigate the requirements for coarse grainings to yield decoherent sets of histo... |
gr-qc/9910070 | Haret Rosu | H.C. Rosu, P. Espinoza, M. Reyes | Ermakov approach for Q=0 empty FRW minisuperspace oscillators | 8 pages, 4 figs | Nuovo Cim. B114 (1999) 1439-1444 | null | null | gr-qc | null | The Wheeler-DeWitt equation for empty FRW minisuperspace universes of
Hartle-Hawking factor ordering parameter Q=0 is mapped onto the dynamics of a
unit mass classical oscillator. The latter is studied by the classical Ermakov
invariant method. Angle quantities are presented in the same context
| [
{
"created": "Thu, 21 Oct 1999 00:50:26 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Dec 1999 21:40:57 GMT",
"version": "v2"
},
{
"created": "Sun, 23 Jan 2000 17:44:06 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Rosu",
"H. C.",
""
],
[
"Espinoza",
"P.",
""
],
[
"Reyes",
"M.",
""
]
] | The Wheeler-DeWitt equation for empty FRW minisuperspace universes of Hartle-Hawking factor ordering parameter Q=0 is mapped onto the dynamics of a unit mass classical oscillator. The latter is studied by the classical Ermakov invariant method. Angle quantities are presented in the same context |
2003.04895 | Z. Yousaf | Z. Yousaf, M. Z. Bhatti, H. Asad | Gravastars in $f(R,T,R_{\mu\nu}T^{\mu\nu})$ Gravity | 28 pages, 4 figures, version accepted for publication in Physics of
the Dark Universe | Phys. Dark Universe 28, 100501 (2020) | 10.1016/j.dark.2020.100527 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work is devoted to study the analytical and regular solutions of a
particular self-gravitating object (i.e., gravastar) in a particular theory of
gravity. We derive the corresponding field equations in the presence of
effective energy momentum tensor associated with the perfect fluid
configuration of a spherical... | [
{
"created": "Tue, 10 Mar 2020 06:53:41 GMT",
"version": "v1"
}
] | 2021-08-30 | [
[
"Yousaf",
"Z.",
""
],
[
"Bhatti",
"M. Z.",
""
],
[
"Asad",
"H.",
""
]
] | This work is devoted to study the analytical and regular solutions of a particular self-gravitating object (i.e., gravastar) in a particular theory of gravity. We derive the corresponding field equations in the presence of effective energy momentum tensor associated with the perfect fluid configuration of a spherical s... |
1611.06922 | Willians Barreto | W. Barreto, H. P. de Oliveira, B. Rodriguez-Mueller | A (gravitational) toy story | 10 pages, 4 figures; updated version to appear in Int. J. Modern
Phys. D | Int. J. Mod. Phys. D 26 (9) 1750096 (2017) | 10.1142/S0218271817500961 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Frequently in Physics, insights and conclusions can be drawn from simple,
idealized models. The discovery of critical behavior in the gravitational
collapse of a massless scalar field leads to the simulation of binary black
holes, from its coalescence to merging and ringdown. We refined a toy model to
explore black h... | [
{
"created": "Mon, 21 Nov 2016 18:02:21 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Feb 2017 13:56:42 GMT",
"version": "v2"
}
] | 2017-11-07 | [
[
"Barreto",
"W.",
""
],
[
"de Oliveira",
"H. P.",
""
],
[
"Rodriguez-Mueller",
"B.",
""
]
] | Frequently in Physics, insights and conclusions can be drawn from simple, idealized models. The discovery of critical behavior in the gravitational collapse of a massless scalar field leads to the simulation of binary black holes, from its coalescence to merging and ringdown. We refined a toy model to explore black hol... |
2006.05404 | Lorenzo Iorio | Lorenzo Iorio | Is there still something left that Gravity Probe B can measure? | LateX2e, 31 pages, 1 table, 4 figures | Universe 2020, 6(6), 85 | 10.3390/universe6060085 | null | gr-qc astro-ph.EP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a full analytical and numerical treatment, to the first
post-Newtonian (1pN) order, of the general relativistic long-term spin
precession of an orbiting gyroscope due to the mass quadrupole moment $J_2$ of
its primary without any restriction on either the gyro's orbital configuration
and the orientation in... | [
{
"created": "Tue, 9 Jun 2020 16:59:23 GMT",
"version": "v1"
}
] | 2020-06-23 | [
[
"Iorio",
"Lorenzo",
""
]
] | We perform a full analytical and numerical treatment, to the first post-Newtonian (1pN) order, of the general relativistic long-term spin precession of an orbiting gyroscope due to the mass quadrupole moment $J_2$ of its primary without any restriction on either the gyro's orbital configuration and the orientation in s... |
1806.02085 | Donato Bini | Donato Bini and Andrea Geralico | High-energy hyperbolic scattering by neutron stars and black holes | 12 pages; 2 figures; revtex macros used | Phys. Rev. D 98, 024049 (2018) | 10.1103/PhysRevD.98.024049 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the hyperbolic scattering of test particles, spinning test
particles and particles with spin-induced quadrupolar structure by a Kerr black
hole in the ultrarelativistic regime. We also study how the features of the
scattering process modify if the source of the background gravitational field
is endowed... | [
{
"created": "Wed, 6 Jun 2018 09:30:43 GMT",
"version": "v1"
}
] | 2018-08-08 | [
[
"Bini",
"Donato",
""
],
[
"Geralico",
"Andrea",
""
]
] | We investigate the hyperbolic scattering of test particles, spinning test particles and particles with spin-induced quadrupolar structure by a Kerr black hole in the ultrarelativistic regime. We also study how the features of the scattering process modify if the source of the background gravitational field is endowed w... |
1508.03581 | Sharmanthie Fernando | Sharmanthie Fernando | Regular black holes in de Sitter universe: scalar field perturbations
and quasinormal modes | Accepted to be published in International Journal of Modern Physics D | Int. Jour. Mod. Phys. D vol: 24, No: 14, 1550104 (2015) | 10.1142/S0218271815501047 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The purpose of this paper is to study quasinormal modes (QNM) of a regular
black hole with a cosmological constant due to scalar perturbations. A detailed
study of the QNM frequencies for the massless scalar field were done by varying
the parameters of the theory such as the mass, magnetic charge, cosmological
consta... | [
{
"created": "Fri, 14 Aug 2015 17:57:17 GMT",
"version": "v1"
}
] | 2016-02-17 | [
[
"Fernando",
"Sharmanthie",
""
]
] | The purpose of this paper is to study quasinormal modes (QNM) of a regular black hole with a cosmological constant due to scalar perturbations. A detailed study of the QNM frequencies for the massless scalar field were done by varying the parameters of the theory such as the mass, magnetic charge, cosmological constant... |
2405.03289 | Enrique Alvarez | Enrique \'Alvarez and Jes\'us Anero | When does General Relativity become linear? | Latex 13 pages,comments added, title changed | null | null | IFT-UAM/CSIC-24-63 | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Nilpotent deformations of an arbitrary background spacetime are considered .
Those are of the form $\bg_{\m\n}+ l_\m l_\n$ with $l^2=0$. The relationship
between the Ricci tensor of the background metric and the Ricci tensor of the
deformed metric is found exactly. It consists of two terms. one is essentially
the Fie... | [
{
"created": "Mon, 6 May 2024 09:06:33 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jun 2024 12:28:01 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Jul 2024 11:34:43 GMT",
"version": "v3"
},
{
"created": "Fri, 9 Aug 2024 07:16:03 GMT",
"version": "v4"
}
] | 2024-08-12 | [
[
"Álvarez",
"Enrique",
""
],
[
"Anero",
"Jesús",
""
]
] | Nilpotent deformations of an arbitrary background spacetime are considered . Those are of the form $\bg_{\m\n}+ l_\m l_\n$ with $l^2=0$. The relationship between the Ricci tensor of the background metric and the Ricci tensor of the deformed metric is found exactly. It consists of two terms. one is essentially the Fierz... |
2207.10740 | Gustavo Gutierrez-Cano | Nora Breton, Gustavo Gutierrez-Cano, Alberto A. Garcia-Diaz | Motion of the charged test particle in the spinning nonlinear
electromagnetic black hole | 14 pages, 19 figures. Accepted for publication in PRD | Phys. Rev. D 106 (2022) 024056 | 10.1103/PhysRevD.106.024056 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper the motion of charged and uncharged test particles in the
rotating nonlinearly charged black hole is examined. Its asymptotics can be de
Sitter or anti-de Sitter, depending on the value of the nonlinear parameter;
consequently this BH can present one, two or three horizons, the third one
being the cosmo... | [
{
"created": "Thu, 21 Jul 2022 20:19:00 GMT",
"version": "v1"
}
] | 2022-08-05 | [
[
"Breton",
"Nora",
""
],
[
"Gutierrez-Cano",
"Gustavo",
""
],
[
"Garcia-Diaz",
"Alberto A.",
""
]
] | In this paper the motion of charged and uncharged test particles in the rotating nonlinearly charged black hole is examined. Its asymptotics can be de Sitter or anti-de Sitter, depending on the value of the nonlinear parameter; consequently this BH can present one, two or three horizons, the third one being the cosmolo... |
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