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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1610.01202 | Deng Wang | Deng Wang and Xin-He Meng | Model-independent determination on $H_0$ using the latest $H(z)$ data | null | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform the improved constraints on the Hubble constant $H_0$ by using the
model-independent method, Gaussian Processes. Utilizing the latest 36 $H(z)$
measurements, we obtain $H_0=69.21\pm3.72$ km s$^{-1}$ Mpc$^{-1}$, which is
consistent with the Planck 2015 and Riess et al. 2016 analysis at $1\sigma$
confidence ... | [
{
"created": "Sat, 1 Oct 2016 14:17:12 GMT",
"version": "v1"
}
] | 2016-10-06 | [
[
"Wang",
"Deng",
""
],
[
"Meng",
"Xin-He",
""
]
] | We perform the improved constraints on the Hubble constant $H_0$ by using the model-independent method, Gaussian Processes. Utilizing the latest 36 $H(z)$ measurements, we obtain $H_0=69.21\pm3.72$ km s$^{-1}$ Mpc$^{-1}$, which is consistent with the Planck 2015 and Riess et al. 2016 analysis at $1\sigma$ confidence le... |
2006.06468 | Raviteja Konka | Konka Raviteja, Sashideep Gutti | Marginally trapped and anti-trapped surfaces for matter evolution in
D-dimensions | 14 pages, 12 figures | Phys. Rev. D 102, 024072 (2020) | 10.1103/PhysRevD.102.024072 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we explore the formation of the marginally trapped and
marginally anti-trapped surfaces that arise from the evolution of homogeneous
dust in D-dimensions with and without the cosmological constant, this is seen
through the analytical expressions for such surfaces. We obtain closed form
expressions for ... | [
{
"created": "Wed, 10 Jun 2020 16:02:23 GMT",
"version": "v1"
}
] | 2020-07-29 | [
[
"Raviteja",
"Konka",
""
],
[
"Gutti",
"Sashideep",
""
]
] | In this paper, we explore the formation of the marginally trapped and marginally anti-trapped surfaces that arise from the evolution of homogeneous dust in D-dimensions with and without the cosmological constant, this is seen through the analytical expressions for such surfaces. We obtain closed form expressions for th... |
1012.2433 | Balakin Alexander | Alexander B. Balakin and Vladimir V. Bochkarev | Archimedean-type force in a cosmic dark fluid: II. Qualitative and
numerical study of a multistage Universe expansion | 15 pages, 12 figures, Part II, typos corrected, Fig.4 replaced,
references corrected | Phys.Rev.D83:024036,2011 | 10.1103/PhysRevD.83.024036 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this (second) part of the work we present the results of numerical and
qualitative analysis, based on a new model of the Archimedean-type interaction
between dark matter and dark energy. The Archimedean-type force is linear in
the four-gradient of the dark energy pressure and plays a role of
self-regulator of the ... | [
{
"created": "Sat, 11 Dec 2010 07:54:49 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Feb 2011 18:12:48 GMT",
"version": "v2"
}
] | 2011-02-28 | [
[
"Balakin",
"Alexander B.",
""
],
[
"Bochkarev",
"Vladimir V.",
""
]
] | In this (second) part of the work we present the results of numerical and qualitative analysis, based on a new model of the Archimedean-type interaction between dark matter and dark energy. The Archimedean-type force is linear in the four-gradient of the dark energy pressure and plays a role of self-regulator of the en... |
2308.02250 | Lavinia Heisenberg | Fabio D'Ambrosio, Lavinia Heisenberg and Stefan Zentarra | Hamiltonian Analysis of $f(Q)$ Gravity and the Failure of the
Dirac-Bergmann Algorithm for Teleparallel Theories of Gravity | 45 pages, 3 figues, Comments are welcome | null | null | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | In recent years, $f(Q)$ gravity has enjoyed considerable attention in the
literature and important results have been obtained. However, the question of
how many physical degrees of freedom the theory propagates -- and how this
number may depend on the form of the function $f$ -- has not been answered
satisfactorily. ... | [
{
"created": "Fri, 4 Aug 2023 11:15:59 GMT",
"version": "v1"
}
] | 2023-08-07 | [
[
"D'Ambrosio",
"Fabio",
""
],
[
"Heisenberg",
"Lavinia",
""
],
[
"Zentarra",
"Stefan",
""
]
] | In recent years, $f(Q)$ gravity has enjoyed considerable attention in the literature and important results have been obtained. However, the question of how many physical degrees of freedom the theory propagates -- and how this number may depend on the form of the function $f$ -- has not been answered satisfactorily. In... |
2307.00506 | Tetsuya Shiromizu | Tetsuya Shiromizu, Keisuke Izumi | Attractive gravity probe surface with positive cosmological constant | 14 pages, version accepted to PTEP | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In four dimensional spacetimes with a positive cosmological constant, we
introduce a new geometrical object associated with the cosmological horizon and
then show the areal inequality. We also examine the attractive gravity probe
surfaces as an indicator for the existence of attractive gravity.
| [
{
"created": "Sun, 2 Jul 2023 07:44:44 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Sep 2023 01:24:42 GMT",
"version": "v2"
}
] | 2023-09-22 | [
[
"Shiromizu",
"Tetsuya",
""
],
[
"Izumi",
"Keisuke",
""
]
] | In four dimensional spacetimes with a positive cosmological constant, we introduce a new geometrical object associated with the cosmological horizon and then show the areal inequality. We also examine the attractive gravity probe surfaces as an indicator for the existence of attractive gravity. |
1807.02461 | Ramin G. Daghigh | Ramin G. Daghigh, Michael D. Green, Gabor Kunstatter | Quantum Mechanics of the Interior of the Russo-Susskind-Thorlacius Black
Hole | 15 pages, 5 figures, accepted for publication in PRD | Phys. Rev. D 98, 124017 (2018) | 10.1103/PhysRevD.98.124017 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the quantum mechanics of homogeneous black hole interiors in the RST
model of 2D gravity. The model, which contains a dilaton and metric, includes
radiation back-reaction terms and is exactly solvable classically. The reduced
phase space is four dimensional. The equations for one pair of variables can be
tri... | [
{
"created": "Fri, 6 Jul 2018 15:44:03 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Dec 2018 19:20:44 GMT",
"version": "v2"
}
] | 2018-12-26 | [
[
"Daghigh",
"Ramin G.",
""
],
[
"Green",
"Michael D.",
""
],
[
"Kunstatter",
"Gabor",
""
]
] | We study the quantum mechanics of homogeneous black hole interiors in the RST model of 2D gravity. The model, which contains a dilaton and metric, includes radiation back-reaction terms and is exactly solvable classically. The reduced phase space is four dimensional. The equations for one pair of variables can be trivi... |
1406.1456 | Antonino Marciano | Stephon Alexander, Yi-Fu Cai and Antonino Marciano | Fermi-bounce cosmology and the fermion curvaton mechanism | 9 pages, 4 figures | null | 10.1016/j.physletb.2015.04.026 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A nonsingular bouncing cosmology can be achieved by introducing a fermion
field with BCS condensation occurring at high energy scales. In this paper we
are able to dilute the anisotropic stress near the bounce by means of releasing
the gap energy density near the phase transition between the radiation and
condensate ... | [
{
"created": "Thu, 5 Jun 2014 17:38:18 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Alexander",
"Stephon",
""
],
[
"Cai",
"Yi-Fu",
""
],
[
"Marciano",
"Antonino",
""
]
] | A nonsingular bouncing cosmology can be achieved by introducing a fermion field with BCS condensation occurring at high energy scales. In this paper we are able to dilute the anisotropic stress near the bounce by means of releasing the gap energy density near the phase transition between the radiation and condensate st... |
1309.4066 | Charles Wang | C. H.-T. Wang, J. A. Reid, A. St J. Murphy, D. Rodrigues, M. Al Alawi,
R. Bingham, J. T. Mendonca, T. B. Davies | A consistent scalar-tensor cosmology for inflation, dark energy and the
Hubble parameter | 6 pages; version accepted by PLA | Physics Letters A 380 (2016) 3761-3765 | 10.1016/j.physleta.2016.09.038 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A Friedman cosmology is investigated based on scalar-tensor gravitation with
general metric coupling and scalar potential functions. We show that for a
broad class of such functions, the scalar field can be dynamically trapped
using a recently suggested mechanism. The trapped scalar can drive inflation
and accelerate... | [
{
"created": "Mon, 16 Sep 2013 18:50:42 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Apr 2016 16:17:15 GMT",
"version": "v2"
},
{
"created": "Thu, 22 Sep 2016 14:58:14 GMT",
"version": "v3"
}
] | 2016-10-05 | [
[
"Wang",
"C. H. -T.",
""
],
[
"Reid",
"J. A.",
""
],
[
"Murphy",
"A. St J.",
""
],
[
"Rodrigues",
"D.",
""
],
[
"Alawi",
"M. Al",
""
],
[
"Bingham",
"R.",
""
],
[
"Mendonca",
"J. T.",
""
],
[
"Davies... | A Friedman cosmology is investigated based on scalar-tensor gravitation with general metric coupling and scalar potential functions. We show that for a broad class of such functions, the scalar field can be dynamically trapped using a recently suggested mechanism. The trapped scalar can drive inflation and accelerated ... |
2303.10376 | Vinod Bhardwaj Dr. | Priyanka Garg, Vinod Kumar Bhardwaj, Anirudh Pradhan | Barrow entropic Quintessence and Dilation dark energy Models with
Generalized HDE cut-off | 18 pages, 9 figures | International Journal of Modern Physics A, Vol. 37, No. 36 (2022)
2250217 (16 pages) | 10.1142/S0217751X22502177 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | In the present work, we have analyzed the behaviors of extension of
generalized Barrow holographic dark energy(`BHDE'). A ``generalized BHDE model
based on the particle and the future horizon using infrared cut-off" was
proposed by Nojiri et al. (2022). In this work, we have reviewed the
generalized BHDE extension un... | [
{
"created": "Sat, 18 Mar 2023 09:52:21 GMT",
"version": "v1"
}
] | 2023-03-21 | [
[
"Garg",
"Priyanka",
""
],
[
"Bhardwaj",
"Vinod Kumar",
""
],
[
"Pradhan",
"Anirudh",
""
]
] | In the present work, we have analyzed the behaviors of extension of generalized Barrow holographic dark energy(`BHDE'). A ``generalized BHDE model based on the particle and the future horizon using infrared cut-off" was proposed by Nojiri et al. (2022). In this work, we have reviewed the generalized BHDE extension unde... |
2103.15634 | Sebasti\'an G\'omez | M. Bravo-Gaete, C. G\'omez, L. Guajardo and S. G\'omez | Towards the emergence of non-zero thermodynamical quantities for
Lanczos-Lovelock black holes dressed with a scalar field | 10 pages, 3 figures | Phys. Rev. D 104, 044027 (2021) | 10.1103/PhysRevD.104.044027 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present work aims to explore the model given by Lanczos-Lovelock gravity
theories indexed by a fixed integer to require a unique anti-de Sitter vacuum,
dressed by a scalar field non-minimal coupling. For this model, we add a
special matter source characterized by a non-linear Maxwell field coupling with
a functio... | [
{
"created": "Mon, 29 Mar 2021 14:12:32 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Jul 2021 20:02:23 GMT",
"version": "v2"
}
] | 2021-08-18 | [
[
"Bravo-Gaete",
"M.",
""
],
[
"Gómez",
"C.",
""
],
[
"Guajardo",
"L.",
""
],
[
"Gómez",
"S.",
""
]
] | The present work aims to explore the model given by Lanczos-Lovelock gravity theories indexed by a fixed integer to require a unique anti-de Sitter vacuum, dressed by a scalar field non-minimal coupling. For this model, we add a special matter source characterized by a non-linear Maxwell field coupling with a function ... |
gr-qc/0005060 | Alicia M. Sintes | A.M. Sintes | Laser interferometer gravitational wave detectors | Latex, 4 pages. Published in "Relativity and Gravitation in general.
Proceedings of the Spanish Relativity Meeting in honour of the 65th birthday
of Lluis Bel". Edts. J. Martin, E. Ruiz, F.Atrio and A. Molina; World
Scientific, pp. 321-324 (1999) | null | null | null | gr-qc | null | I give a brief introduction on gravitational wave laser interferometers,
possible detectable sources from the ground and noise in the detectors
| [
{
"created": "Tue, 16 May 2000 12:37:31 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sintes",
"A. M.",
""
]
] | I give a brief introduction on gravitational wave laser interferometers, possible detectable sources from the ground and noise in the detectors |
2309.07825 | Martin Bojowald | Luis Martinez, Martin Bojowald, Garrett Wendel | Freeze-free cosmological evolution with a non-monotonic internal clock | 24 pages, 4 figures | Phys. Rev. D 108 (2023) 086001 | 10.1103/PhysRevD.108.086001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Given the lack of an absolute time parameter in general relativistic systems,
quantum cosmology often describes the expansion of the universe in terms of
relational changes between two degrees of freedom, such as matter and geometry.
However, if clock degrees of freedom (self-)interact non-trivially, they in
general ... | [
{
"created": "Thu, 14 Sep 2023 16:18:10 GMT",
"version": "v1"
}
] | 2023-10-16 | [
[
"Martinez",
"Luis",
""
],
[
"Bojowald",
"Martin",
""
],
[
"Wendel",
"Garrett",
""
]
] | Given the lack of an absolute time parameter in general relativistic systems, quantum cosmology often describes the expansion of the universe in terms of relational changes between two degrees of freedom, such as matter and geometry. However, if clock degrees of freedom (self-)interact non-trivially, they in general ha... |
1509.01695 | Gerard Hooft 't | Gerard t Hooft | Diagonalizing the Black Hole Information Retrieval Process | 10 pages, no figures | null | null | ITP-UU-15/12 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mechanism by which black holes return the absorbed information to the
outside world is reconsidered, and described in terms of a set of mutually
non-interacting modes. Our mechanism is based on the mostly classical
gravitational back-reaction. The diagonalized formalism is particularly useful
for further studies ... | [
{
"created": "Sat, 5 Sep 2015 11:47:49 GMT",
"version": "v1"
}
] | 2015-09-08 | [
[
"Hooft",
"Gerard t",
""
]
] | The mechanism by which black holes return the absorbed information to the outside world is reconsidered, and described in terms of a set of mutually non-interacting modes. Our mechanism is based on the mostly classical gravitational back-reaction. The diagonalized formalism is particularly useful for further studies of... |
2404.10721 | Adailton Ara\'ujo Filho | A. A. Ara\'ujo Filho, N. Heidari, J. A. A. S. Reis, H. Hassanabadi | The impact of an antisymmetric tensor on charged black holes:
evaporation process, geodesics, deflection angle, scattering effects and
quasinormal modes | 44 pages, 17 figures, and 9 tables | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the influence of anti-symmetric tensor effects,
which trigger the Lorentz symmetry breaking, on charged spherically symmetric
black holes. Initially, we address an overview of the model, laying the
groundwork for deriving solutions to black holes. With this, we analyze the
horizons, crit... | [
{
"created": "Tue, 16 Apr 2024 16:54:00 GMT",
"version": "v1"
}
] | 2024-04-17 | [
[
"Filho",
"A. A. Araújo",
""
],
[
"Heidari",
"N.",
""
],
[
"Reis",
"J. A. A. S.",
""
],
[
"Hassanabadi",
"H.",
""
]
] | In this paper, we investigate the influence of anti-symmetric tensor effects, which trigger the Lorentz symmetry breaking, on charged spherically symmetric black holes. Initially, we address an overview of the model, laying the groundwork for deriving solutions to black holes. With this, we analyze the horizons, critic... |
0709.1933 | Victor Hamity H | V. H. Hamity, M. A. Cecere and D. E. Barraco | Relativistic dynamics of cylindrical shells of counter-rotating
particles | 19 pages, 8 figures | Gen.Rel.Grav.41:2657-2676,2009 | 10.1007/s10714-009-0794-x | null | gr-qc | null | Although infinite cylinders are not astrophysical entities, it is possible to
learn a great deal about the basic qualitative features of generation of
gravitational waves and the behavior of the matter conforming such shells in
the limits of very small radius. We describe the analytical model using kinetic
theory for... | [
{
"created": "Wed, 12 Sep 2007 17:22:24 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Hamity",
"V. H.",
""
],
[
"Cecere",
"M. A.",
""
],
[
"Barraco",
"D. E.",
""
]
] | Although infinite cylinders are not astrophysical entities, it is possible to learn a great deal about the basic qualitative features of generation of gravitational waves and the behavior of the matter conforming such shells in the limits of very small radius. We describe the analytical model using kinetic theory for t... |
1508.06701 | Juliano Neves | J. C. S. Neves | Deforming regular black holes | 9 pages, 4 figures. Version 3 matches the published version in IJMPA | Int. J. Mod. Phys. A 32, 1750112 (2017) | 10.1142/S0217751X17501123 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we have deformed regular black holes which possess a general
mass term described by a function which generalizes the Bardeen and Hayward
mass functions. By using linear constraints in the energy-momentum tensor to
generate metrics, the solutions presented in this work are either regular or
singular. That... | [
{
"created": "Thu, 27 Aug 2015 02:12:57 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Aug 2016 19:07:36 GMT",
"version": "v2"
},
{
"created": "Wed, 28 Jun 2017 15:27:27 GMT",
"version": "v3"
}
] | 2017-06-29 | [
[
"Neves",
"J. C. S.",
""
]
] | In this work we have deformed regular black holes which possess a general mass term described by a function which generalizes the Bardeen and Hayward mass functions. By using linear constraints in the energy-momentum tensor to generate metrics, the solutions presented in this work are either regular or singular. That i... |
gr-qc/0503001 | Carlos O. Lousto | Carlos O. Lousto (UT Brownsville) | A time-domain fourth-order-convergent numerical algorithm to integrate
black hole perturbations in the extreme-mass-ratio limit | 30 pages, 12 figures | Class.Quant.Grav. 22 (2005) S543-S568 | 10.1088/0264-9381/22/15/001 | null | gr-qc | null | We obtain a fourth order accurate numerical algorithm to integrate the
Zerilli and Regge-Wheeler wave equations, describing perturbations of
nonrotating black holes, with source terms due to an orbiting particle. Those
source terms contain the Dirac's delta and its first derivative. We also
re-derive the source of th... | [
{
"created": "Mon, 28 Feb 2005 23:46:49 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Aug 2005 19:47:53 GMT",
"version": "v2"
},
{
"created": "Fri, 26 May 2006 23:16:44 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Lousto",
"Carlos O.",
"",
"UT Brownsville"
]
] | We obtain a fourth order accurate numerical algorithm to integrate the Zerilli and Regge-Wheeler wave equations, describing perturbations of nonrotating black holes, with source terms due to an orbiting particle. Those source terms contain the Dirac's delta and its first derivative. We also re-derive the source of the ... |
1006.5666 | Etera R. Livine | Mait\'e Dupuis, Etera R. Livine | Revisiting the Simplicity Constraints and Coherent Intertwiners | 28 pages | Class.Quant.Grav.28:085001,2011 | 10.1088/0264-9381/28/8/085001 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of loop quantum gravity and spinfoam models, the simplicity
constraints are essential in that they allow to write general relativity as a
constrained topological BF theory. In this work, we apply the recently
developed U(N) framework for SU(2) intertwiners to the issue of imposing the
simplicity constr... | [
{
"created": "Tue, 29 Jun 2010 16:18:35 GMT",
"version": "v1"
}
] | 2011-03-17 | [
[
"Dupuis",
"Maité",
""
],
[
"Livine",
"Etera R.",
""
]
] | In the context of loop quantum gravity and spinfoam models, the simplicity constraints are essential in that they allow to write general relativity as a constrained topological BF theory. In this work, we apply the recently developed U(N) framework for SU(2) intertwiners to the issue of imposing the simplicity constrai... |
0808.0107 | S Habib Mazharimousavi | S. Habib Mazharimousavi, I. Sakalli and M. Halilsoy | Hawking radiation for higher dimensional Einstein-Yang-Mills linear
dilaton black holes | 9 pages, 2 figures, | Physics Letters B 672 (2009) 177 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, Hawking radiation from a $4-$dimensional linear dilaton black hole
solution to Einstein-Maxwell-Dilaton (EMD) theory, via a method of computing
exactly the semi-classical radiation, has been derived by Cl\U{e9}ment, et al.
Their results show that, whenever solution is available to the massless scalar
wave e... | [
{
"created": "Fri, 1 Aug 2008 12:28:20 GMT",
"version": "v1"
}
] | 2009-02-09 | [
[
"Mazharimousavi",
"S. Habib",
""
],
[
"Sakalli",
"I.",
""
],
[
"Halilsoy",
"M.",
""
]
] | Recently, Hawking radiation from a $4-$dimensional linear dilaton black hole solution to Einstein-Maxwell-Dilaton (EMD) theory, via a method of computing exactly the semi-classical radiation, has been derived by Cl\U{e9}ment, et al. Their results show that, whenever solution is available to the massless scalar wave equ... |
gr-qc/9604019 | Carsten Gundlach | Carsten Gundlach | Understanding critical collapse of a scalar field | RevTex, 26 galley or 53 preprint pages, 3 EPS figures, 2 tables | Phys.Rev. D55 (1997) 695-713 | 10.1103/PhysRevD.55.695 | LAEFF-96/07 | gr-qc | null | I construct a spherically symmetric solution for a massless real scalar field
minimally coupled to general relativity which is discretely self-similar (DSS)
and regular. This solution coincides with the intermediate attractor found by
Choptuik in critical gravitational collapse. The echoing period is Delta =
3.4453 +... | [
{
"created": "Mon, 8 Apr 1996 16:36:52 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Gundlach",
"Carsten",
""
]
] | I construct a spherically symmetric solution for a massless real scalar field minimally coupled to general relativity which is discretely self-similar (DSS) and regular. This solution coincides with the intermediate attractor found by Choptuik in critical gravitational collapse. The echoing period is Delta = 3.4453 +/-... |
gr-qc/0702137 | Hakan Andreasson | Hakan Andreasson | Sharp bounds on $2m/r$ of general spherically symmetric static objects | 28 pages, typos corrected and the analogy in section 4 is presented
slightly differently | J. Diff. Eq. 245:2243-2266,2008 | 10.1016/j.jde.2008.05.010 | null | gr-qc | null | In 1959 Buchdahl \cite{Bu} obtained the inequality $2M/R\leq 8/9$ under the
assumptions that the energy density is non-increasing outwards and that the
pressure is isotropic. Here $M$ is the ADM mass and $R$ the area radius of the
boundary of the static body. The assumptions used to derive the Buchdahl
inequality are... | [
{
"created": "Mon, 26 Feb 2007 13:48:38 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Mar 2007 16:16:51 GMT",
"version": "v2"
}
] | 2011-08-31 | [
[
"Andreasson",
"Hakan",
""
]
] | In 1959 Buchdahl \cite{Bu} obtained the inequality $2M/R\leq 8/9$ under the assumptions that the energy density is non-increasing outwards and that the pressure is isotropic. Here $M$ is the ADM mass and $R$ the area radius of the boundary of the static body. The assumptions used to derive the Buchdahl inequality are v... |
1401.3155 | Wolung Lee | Wenjie Lu, Wolung Lee and Kin-Wang Ng | Teleparallel Poincar\'{e} Cosmology and $\Lambda$CDM Model | 7 pages by revtex4.1, no figure | IJMPD 23(2014)1450057 | 10.1142/S0218271814500576 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply the teleparallelism condition to the Poincar\'{e} gauge theory of
gravity. The resultant teleparallelized cosmology is completely equivalent to
the Friedmann cosmology derived from Einstein's general theory of relativity.
The torsion is shown to play the role of the cosmological constant driving the
cosmic a... | [
{
"created": "Tue, 14 Jan 2014 11:56:14 GMT",
"version": "v1"
}
] | 2014-09-10 | [
[
"Lu",
"Wenjie",
""
],
[
"Lee",
"Wolung",
""
],
[
"Ng",
"Kin-Wang",
""
]
] | We apply the teleparallelism condition to the Poincar\'{e} gauge theory of gravity. The resultant teleparallelized cosmology is completely equivalent to the Friedmann cosmology derived from Einstein's general theory of relativity. The torsion is shown to play the role of the cosmological constant driving the cosmic acc... |
2210.09861 | Yuewen Chen | Yuewen Chen, Shing-Tung Yau | Stable regular solution of Einstein-Yang-Mills equation | null | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this letter, we find the first dynamically stable non-singular solution
spherically symmetric SU(2) Einstein-Yang-Mills equation. This solutions is
regular at r=0 and asymptotically flat. Since the Yang-Mills field strength
decay exponentially, the Einstein-Yang-Mills particle perhaps can be used to be
a candidate... | [
{
"created": "Tue, 18 Oct 2022 13:48:30 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Oct 2022 16:35:07 GMT",
"version": "v2"
},
{
"created": "Sun, 30 Oct 2022 13:12:05 GMT",
"version": "v3"
}
] | 2022-11-01 | [
[
"Chen",
"Yuewen",
""
],
[
"Yau",
"Shing-Tung",
""
]
] | In this letter, we find the first dynamically stable non-singular solution spherically symmetric SU(2) Einstein-Yang-Mills equation. This solutions is regular at r=0 and asymptotically flat. Since the Yang-Mills field strength decay exponentially, the Einstein-Yang-Mills particle perhaps can be used to be a candidate f... |
1808.00317 | Paul Tod | Paul Tod | An example of an asymptotically $AdS_2\times S^2$ metric satisfying NEC
but which is not exactly $AdS_2\times S^2$ | 8 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give an example of an asymptotically $AdS_2\times S^2$ metric, in the
sense of \cite{GG}, which satisfies the Null Energy Condition but is not
exactly $AdS_2\times S^2$. It is therefore a counterexample to a conjecture of
Maldacena mentioned in \cite{GG}, but it does not satisfy field equations. In
an appendix we ... | [
{
"created": "Wed, 1 Aug 2018 13:47:29 GMT",
"version": "v1"
}
] | 2018-08-02 | [
[
"Tod",
"Paul",
""
]
] | We give an example of an asymptotically $AdS_2\times S^2$ metric, in the sense of \cite{GG}, which satisfies the Null Energy Condition but is not exactly $AdS_2\times S^2$. It is therefore a counterexample to a conjecture of Maldacena mentioned in \cite{GG}, but it does not satisfy field equations. In an appendix we gi... |
gr-qc/9905107 | Sardanashvily Gennadi | L.Mangiarotti, G.Sardanashvily | Nonrelativistic Geodesic Motion | 17 pages, LaTeX | null | null | null | gr-qc | null | We show that any second order dynamic equation on a configuration space $X\to
R$ of nonrelativistic mechanics can be seen as a geodesic equation with respect
to some (nonlinear) connection on the tangent bundle $TX\to X$ of relativistic
velocities. We compare relativistic and nonrelativistic geodesic equations, and
s... | [
{
"created": "Mon, 31 May 1999 06:31:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mangiarotti",
"L.",
""
],
[
"Sardanashvily",
"G.",
""
]
] | We show that any second order dynamic equation on a configuration space $X\to R$ of nonrelativistic mechanics can be seen as a geodesic equation with respect to some (nonlinear) connection on the tangent bundle $TX\to X$ of relativistic velocities. We compare relativistic and nonrelativistic geodesic equations, and stu... |
gr-qc/0005094 | Joseph Samuel | Joseph Samuel | Canonical Gravity, Diffeomorphisms and Objective Histories | Latex 16 Pages, no figures, revised in the light of referees'
comments, accepted for publication in Classical and Quantum Gravity | Class.Quant.Grav. 17 (2000) 4645-4654 | 10.1088/0264-9381/17/22/305 | null | gr-qc | null | This paper discusses the implementation of diffeomorphism invariance in
purely Hamiltonian formulations of General Relativity. We observe that, if a
constrained Hamiltonian formulation derives from a manifestly covariant
Lagrangian, the diffeomorphism invariance of the Lagrangian results in the
following properties o... | [
{
"created": "Mon, 22 May 2000 07:54:12 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Sep 2000 12:23:43 GMT",
"version": "v2"
},
{
"created": "Wed, 20 Sep 2000 10:46:16 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Samuel",
"Joseph",
""
]
] | This paper discusses the implementation of diffeomorphism invariance in purely Hamiltonian formulations of General Relativity. We observe that, if a constrained Hamiltonian formulation derives from a manifestly covariant Lagrangian, the diffeomorphism invariance of the Lagrangian results in the following properties of ... |
gr-qc/0405102 | Filipe Mena | Paul Tod (Oxford) and Filipe C. Mena (Oxford/Minho) | Matching of spatially homogeneous non-stationary space--times to vacuum
in cylindrical symmetry | LaTeX, 15 pages, 1 figure, submitted for publication | Phys.Rev.D70:104028,2004 | 10.1103/PhysRevD.70.104028 | null | gr-qc | null | We study the matching of LRS spatially homogeneous collapsing dust
space-times with non-stationary vacuum exteriors in cylindrical symmetry. Given
an interior with diagonal metric we prove existence and uniqueness results for
the exterior. The matched solutions contain trapped surfaces, singularities and
Cauchy horiz... | [
{
"created": "Tue, 18 May 2004 22:22:08 GMT",
"version": "v1"
}
] | 2011-08-12 | [
[
"Tod",
"Paul",
"",
"Oxford"
],
[
"Mena",
"Filipe C.",
"",
"Oxford/Minho"
]
] | We study the matching of LRS spatially homogeneous collapsing dust space-times with non-stationary vacuum exteriors in cylindrical symmetry. Given an interior with diagonal metric we prove existence and uniqueness results for the exterior. The matched solutions contain trapped surfaces, singularities and Cauchy horizon... |
1311.3275 | Peter K.F. Kuhfittig | Peter K.F. Kuhfittig | A note on wormholes in slightly modified gravitational theories | 4 pages, no figures | Adv. Studies Theor. Phys., vol. 7, 1087-1093 (2013) | 10.12988/astp.2013.3998 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Wormholes that meet the flare-out condition violate the weak energy condition
in classical general relativity. The purpose of this note is to show that even
a slight modification of the gravitational theory could, under certain
conditions, avoid this violation for matter threading the wormhole. The first
part discuss... | [
{
"created": "Wed, 13 Nov 2013 20:05:44 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Dec 2013 17:52:03 GMT",
"version": "v2"
},
{
"created": "Thu, 2 Feb 2017 16:20:28 GMT",
"version": "v3"
}
] | 2017-02-03 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | Wormholes that meet the flare-out condition violate the weak energy condition in classical general relativity. The purpose of this note is to show that even a slight modification of the gravitational theory could, under certain conditions, avoid this violation for matter threading the wormhole. The first part discusses... |
0811.3952 | Ulrich Sperhake | Jose A. Gonzalez, Ulrich Sperhake, Bernd Bruegmann | Black-hole binary simulations: the mass ratio 10:1 | To match published version | Phys.Rev.D79:124006,2009 | 10.1103/PhysRevD.79.124006 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the first numerical simulations of an initially non-spinning
black-hole binary with mass ratio as large as 10:1 in full general relativity.
The binary completes approximately 3 orbits prior to merger and radiates about
0.415% of the total energy and 12.48% of the initial angular momentum in the
form of gra... | [
{
"created": "Mon, 24 Nov 2008 20:51:26 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Aug 2009 02:49:59 GMT",
"version": "v2"
}
] | 2010-03-26 | [
[
"Gonzalez",
"Jose A.",
""
],
[
"Sperhake",
"Ulrich",
""
],
[
"Bruegmann",
"Bernd",
""
]
] | We present the first numerical simulations of an initially non-spinning black-hole binary with mass ratio as large as 10:1 in full general relativity. The binary completes approximately 3 orbits prior to merger and radiates about 0.415% of the total energy and 12.48% of the initial angular momentum in the form of gravi... |
2311.12930 | Marco Calz\`a | Marco Calz\`a, Jo\~ao G.Rosa | Determining the spin of light primordial black holes with Hawking
radiation II: high spin regime | null | null | null | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a method to determine the mass and spin of primordial black holes
based on measuring the energy and emission rate at the dipolar and quadrupolar
peaks in the primary photon Hawking spectrum, applicable for dimensionless spin
parameters $\tilde{a}\gtrsim 0.6$. In particular, we show that the ratio
between t... | [
{
"created": "Tue, 21 Nov 2023 19:00:05 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Dec 2023 17:06:58 GMT",
"version": "v2"
}
] | 2023-12-05 | [
[
"Calzà",
"Marco",
""
],
[
"Rosa",
"João G.",
""
]
] | We propose a method to determine the mass and spin of primordial black holes based on measuring the energy and emission rate at the dipolar and quadrupolar peaks in the primary photon Hawking spectrum, applicable for dimensionless spin parameters $\tilde{a}\gtrsim 0.6$. In particular, we show that the ratio between the... |
1510.02347 | Mohsen Fathi | Mohsen Fathi, Morteza Mohseni | Surface configuration in $R + {\mu}^4/R$ gravity | 10 pages, 9 figures | Mod. Phys. Lett. A, Vol. 30, No. 33 (2015) 1550171 | 10.1142/S0217732315501710 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the conditions on the additional constant $\mu$ in the
so-called $R+\mu^4/R$ theory of gravity, due to existence of different kinds of
space-like surfaces in both weak field and strong field limits, and their
possible correspondence to black hole event horizons. Adopting a Schwarzschild
limit, we probe... | [
{
"created": "Wed, 7 Oct 2015 04:54:49 GMT",
"version": "v1"
}
] | 2015-10-09 | [
[
"Fathi",
"Mohsen",
""
],
[
"Mohseni",
"Morteza",
""
]
] | We investigate the conditions on the additional constant $\mu$ in the so-called $R+\mu^4/R$ theory of gravity, due to existence of different kinds of space-like surfaces in both weak field and strong field limits, and their possible correspondence to black hole event horizons. Adopting a Schwarzschild limit, we probe t... |
1712.09106 | Lorenzo Iorio | Lorenzo Iorio | Perspectives on constraining a cosmological constant-type parameter with
pulsar timing in the Galactic Center | Latex2e, 12 pages, 1 table, 1 figure, 79 references | Universe (2018) 4: 59 | 10.3390/universe4040059 | null | gr-qc astro-ph.GA physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Independent tests aiming to constrain the value of the cosmological constant
$\Lambda$ are usually difficult because of its extreme smallness $\left(\Lambda
\simeq 1\times 10^{-52}~\textrm{m}^{-2},~\textrm{or}~2.89\times
10^{-122}~\textrm{in Planck units}\right)$. Bounds on it from Solar System
orbital motions determ... | [
{
"created": "Mon, 25 Dec 2017 17:42:38 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Dec 2017 10:23:03 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Mar 2018 18:18:16 GMT",
"version": "v3"
}
] | 2018-03-28 | [
[
"Iorio",
"Lorenzo",
""
]
] | Independent tests aiming to constrain the value of the cosmological constant $\Lambda$ are usually difficult because of its extreme smallness $\left(\Lambda \simeq 1\times 10^{-52}~\textrm{m}^{-2},~\textrm{or}~2.89\times 10^{-122}~\textrm{in Planck units}\right)$. Bounds on it from Solar System orbital motions determin... |
2207.11023 | Andronikos Paliathanasis | Andronikos Paliathanasis | Cosmological solutions with time-delay | 18 pages, 3 figures, to appear in MPLA | null | 10.1142/S021773232250167X | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We introduce a time-delay function in bulk viscosity cosmology. Even for bulk
viscosity functions where closed-form solutions are known, because of the
time-delay term the exact solutions are lost. Therefore in order to study the
cosmological evolution of the resulting models we perform a detail analysis of
the stabi... | [
{
"created": "Fri, 22 Jul 2022 11:55:09 GMT",
"version": "v1"
}
] | 2022-11-23 | [
[
"Paliathanasis",
"Andronikos",
""
]
] | We introduce a time-delay function in bulk viscosity cosmology. Even for bulk viscosity functions where closed-form solutions are known, because of the time-delay term the exact solutions are lost. Therefore in order to study the cosmological evolution of the resulting models we perform a detail analysis of the stabili... |
2401.15342 | Junji Jia | Shaofei Xu, Junji Jia | Dragging of the particle spin and spin-spin coupling effect on its
periapsis shift | 7 pages, 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The periapsis shift (PS) of spinning test particles in the equatorial plane
of arbitrary stationary and axisymmetric spacetime is studied using the
post-Newtonian method. The result is expressed as a half-integer power series
of $M/p$ where $M$ is the spacetime mass and $p$ is the semilatus rectum. The
coefficients o... | [
{
"created": "Sat, 27 Jan 2024 08:20:55 GMT",
"version": "v1"
}
] | 2024-01-30 | [
[
"Xu",
"Shaofei",
""
],
[
"Jia",
"Junji",
""
]
] | The periapsis shift (PS) of spinning test particles in the equatorial plane of arbitrary stationary and axisymmetric spacetime is studied using the post-Newtonian method. The result is expressed as a half-integer power series of $M/p$ where $M$ is the spacetime mass and $p$ is the semilatus rectum. The coefficients of ... |
2101.06442 | Eugen Radu | C. A. R. Herdeiro, J. Kunz, I. Perapechka, E. Radu and Y. Shnir | Chains of Boson Stars | 20 pages, 6 figures | Phys. Rev. D 103, 065009 (2021) | 10.1103/PhysRevD.103.065009 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We study axially symmetric multi-soliton solutions of a complex scalar field
theory with a sextic potential, minimally coupled to Einstein's gravity. These
solutions carry no angular momentum and can be classified by the number of
nodes of the scalar field, $k_z$, along the symmetry axis; they are interpreted
as chai... | [
{
"created": "Sat, 16 Jan 2021 12:34:00 GMT",
"version": "v1"
}
] | 2021-03-31 | [
[
"Herdeiro",
"C. A. R.",
""
],
[
"Kunz",
"J.",
""
],
[
"Perapechka",
"I.",
""
],
[
"Radu",
"E.",
""
],
[
"Shnir",
"Y.",
""
]
] | We study axially symmetric multi-soliton solutions of a complex scalar field theory with a sextic potential, minimally coupled to Einstein's gravity. These solutions carry no angular momentum and can be classified by the number of nodes of the scalar field, $k_z$, along the symmetry axis; they are interpreted as chains... |
gr-qc/0412110 | Valery Kiselev | V.V.Kiselev | Radial geodesics as a microscopic origin of black hole entropy. III:
Exercise with the Kerr-Newman black hole | 6 pages, 1 eps-figure, iopart class, acknowledgement extended | null | null | null | gr-qc astro-ph hep-th | null | We specify an angular motion on geodesics to reduce the problem to the case
of radial motion elaborated in previous chapters. An appropriate value of
entropy for a charged and rotating black hole is obtained by calculating the
partition function on thermal geodesics confined under horizons. The quantum
aggregation is... | [
{
"created": "Wed, 22 Dec 2004 07:58:24 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Dec 2004 08:46:34 GMT",
"version": "v2"
},
{
"created": "Tue, 4 Jan 2005 09:32:33 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Kiselev",
"V. V.",
""
]
] | We specify an angular motion on geodesics to reduce the problem to the case of radial motion elaborated in previous chapters. An appropriate value of entropy for a charged and rotating black hole is obtained by calculating the partition function on thermal geodesics confined under horizons. The quantum aggregation is c... |
0801.4854 | Tatyana P. Shestakova | T. P. Shestakova | The Wheeler - DeWitt Quantum Geometrodynamics: its fundamental problems
and tendencies of their resolution | 8 pages, no figures | Proceedings of Russian summer school-seminar on Gravitation and
Cosmology "GRACOS-2007", Kazan (2007) P. 179 - 183 | null | null | gr-qc | null | The paper is devoted to fundamental problems of the Wheeler - DeWitt quantum
geometrodynamics, which was the first attempt to apply quantum principles to
the Universe as a whole. Our purpose is to find out the origin of these
problems and follow up their consequences. We start from Dirac generalized
Hamiltonian dynam... | [
{
"created": "Thu, 31 Jan 2008 12:11:18 GMT",
"version": "v1"
}
] | 2008-02-01 | [
[
"Shestakova",
"T. P.",
""
]
] | The paper is devoted to fundamental problems of the Wheeler - DeWitt quantum geometrodynamics, which was the first attempt to apply quantum principles to the Universe as a whole. Our purpose is to find out the origin of these problems and follow up their consequences. We start from Dirac generalized Hamiltonian dynamic... |
1212.4673 | Mohammad Malekjani | Mohammad Malekjani | Cosmography of interacting generalized QCD ghost dark energy | 20 pages, 8 figures | In. J. Mod. Phys D 22 (2013) 1350084 | 10.1142/S0218271813500843 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Exploring the accelerated expansion of the universe, we investigate the
generalized ghost dark energy (GGDE) model from the statefinder diagnosis
analysis in a flat FRW universe. First we calculate the cosmological evolution
and statefinder trajectories for non-interacting case and then extend this work
by considerin... | [
{
"created": "Tue, 18 Dec 2012 06:46:39 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Aug 2013 05:49:04 GMT",
"version": "v2"
}
] | 2015-06-12 | [
[
"Malekjani",
"Mohammad",
""
]
] | Exploring the accelerated expansion of the universe, we investigate the generalized ghost dark energy (GGDE) model from the statefinder diagnosis analysis in a flat FRW universe. First we calculate the cosmological evolution and statefinder trajectories for non-interacting case and then extend this work by considering ... |
1011.1326 | Raymond Chiao Y. | R. Y. Chiao | Test of the superluminality of supercurrents induced by a local electric
field in a superconducting-core coaxial cable | White paper, 6 pages, 1 figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An experiment is proposed to test the prediction that induced supercurrents
in a superconductor can become superluminal, as was predicted in the paper by
S.J. Minter, K. Wegter-McNelly, R.Y. Chiao, Physica E 42 (2010) 234.
| [
{
"created": "Fri, 5 Nov 2010 06:03:04 GMT",
"version": "v1"
}
] | 2010-11-08 | [
[
"Chiao",
"R. Y.",
""
]
] | An experiment is proposed to test the prediction that induced supercurrents in a superconductor can become superluminal, as was predicted in the paper by S.J. Minter, K. Wegter-McNelly, R.Y. Chiao, Physica E 42 (2010) 234. |
2311.03433 | Pablo Antonio Cano Molina-Ni\~nirola | Pablo A. Cano, Ludovico Machet, Charlotte Myin | Boson stars with nonlinear sigma models | 12 pages, 5 figures. v2: references added | null | null | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Boson stars arise as solutions of a massive complex scalar field coupled to
gravity. A variety of scalar potentials, giving rise to different types of
boson stars, have been studied in the literature. Here we study instead the
effect of promoting the kinetic term of the scalar field to a nonlinear sigma
model -- an e... | [
{
"created": "Mon, 6 Nov 2023 19:00:00 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Nov 2023 15:22:21 GMT",
"version": "v2"
}
] | 2023-11-17 | [
[
"Cano",
"Pablo A.",
""
],
[
"Machet",
"Ludovico",
""
],
[
"Myin",
"Charlotte",
""
]
] | Boson stars arise as solutions of a massive complex scalar field coupled to gravity. A variety of scalar potentials, giving rise to different types of boson stars, have been studied in the literature. Here we study instead the effect of promoting the kinetic term of the scalar field to a nonlinear sigma model -- an ext... |
2206.14117 | Samuel S\'anchez L\'opez | Konstantinos Dimopoulos, Alexandros Karam, Samuel S\'anchez L\'opez
and Eemeli Tomberg | Palatini $R^2$ Quintessential Inflation | 45 pages, 11 figures | null | 10.1088/1475-7516/2022/10/076 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a model of quintessential inflation in Palatini $R^2$ gravity
employing a scalar field with a simple exponential potential and coupled to
gravity with a running non-minimal coupling. At early times, the field acts as
the inflaton, while later on it becomes the current dark energy. Combining the
scalar se... | [
{
"created": "Tue, 28 Jun 2022 16:23:46 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Nov 2022 17:24:52 GMT",
"version": "v2"
}
] | 2022-11-03 | [
[
"Dimopoulos",
"Konstantinos",
""
],
[
"Karam",
"Alexandros",
""
],
[
"López",
"Samuel Sánchez",
""
],
[
"Tomberg",
"Eemeli",
""
]
] | We construct a model of quintessential inflation in Palatini $R^2$ gravity employing a scalar field with a simple exponential potential and coupled to gravity with a running non-minimal coupling. At early times, the field acts as the inflaton, while later on it becomes the current dark energy. Combining the scalar sect... |
gr-qc/0205084 | Victor N. Pervushin | V.N. Pervushin and D.V. Proskurin | Cosmic Evolution as Inertial Motion in the Field Space of GR | RevTex file, 23 pages, 1 figure. Talk submitted to the 9th Course on
Astrofundamental Physics (Palermo-Sicily 7-18 September 2002). The abstract,
introduction, and conclusion are changed | null | null | null | gr-qc astro-ph hep-th | null | The identification of a cosmic scale function with the volume integral of a
spacelike hypersurface defines the cosmic evolution in General Relativity as a
collective motion along a geodesic in the field space of the metric components,
considered as the coset of the affine group over the Lorentz one.
The Friedmann e... | [
{
"created": "Mon, 20 May 2002 09:05:00 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jul 2002 14:21:28 GMT",
"version": "v2"
},
{
"created": "Wed, 10 Jul 2002 12:27:12 GMT",
"version": "v3"
},
{
"created": "Thu, 25 Jul 2002 12:33:50 GMT",
"version": "v4"
}
] | 2016-08-31 | [
[
"Pervushin",
"V. N.",
""
],
[
"Proskurin",
"D. V.",
""
]
] | The identification of a cosmic scale function with the volume integral of a spacelike hypersurface defines the cosmic evolution in General Relativity as a collective motion along a geodesic in the field space of the metric components, considered as the coset of the affine group over the Lorentz one. The Friedmann equat... |
gr-qc/0108079 | Claudio Simeone | Hernan De Cicco and Claudio Simeone | Gauge invariance of parametrized systems and path integral quantization | 23 pages | Int.J.Mod.Phys. A14 (1999) 5105-5120 | 10.1142/S0217751X99002414 | null | gr-qc | null | Gauge invariance of systems whose Hamilton-Jacobi equation is separable is
improved by adding surface terms to the action fuctional. The general form of
these terms is given for some complete solutions of the Hamilton-Jacobi
equation. The procedure is applied to the relativistic particle and toy
universes, which are ... | [
{
"created": "Thu, 30 Aug 2001 21:02:23 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"De Cicco",
"Hernan",
""
],
[
"Simeone",
"Claudio",
""
]
] | Gauge invariance of systems whose Hamilton-Jacobi equation is separable is improved by adding surface terms to the action fuctional. The general form of these terms is given for some complete solutions of the Hamilton-Jacobi equation. The procedure is applied to the relativistic particle and toy universes, which are qu... |
2212.09486 | Thomas Colas | Thomas Colas, Julien Grain, Vincent Vennin | Quantum recoherence in the early universe | 5 + 12 pages, 4 + 2 figures, matches published version in EPL | EPL 142 69002 (2023) | 10.1209/0295-5075/acdd94 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Despite being created through a fundamentally quantum-mechanical process,
cosmological structures have not yet revealed any sign of genuine quantum
correlations. Among the obstructions to the direct detection of quantum
signatures in cosmology, environmental-induced decoherence is arguably one of
the most inevitable.... | [
{
"created": "Mon, 19 Dec 2022 14:20:37 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Jun 2023 09:35:18 GMT",
"version": "v2"
}
] | 2023-06-30 | [
[
"Colas",
"Thomas",
""
],
[
"Grain",
"Julien",
""
],
[
"Vennin",
"Vincent",
""
]
] | Despite being created through a fundamentally quantum-mechanical process, cosmological structures have not yet revealed any sign of genuine quantum correlations. Among the obstructions to the direct detection of quantum signatures in cosmology, environmental-induced decoherence is arguably one of the most inevitable. Y... |
1702.05694 | Richard Woodard | S. P. Miao (NCKU, Taiwan), N. C. Tsamis (U. Crete), and R. P. Woodard
(U. Florida) | Invariant Measure of the One Loop Quantum Gravitational Back-Reaction on
Inflation | 26 pages, 2 figures, 1 table, uses LaTeX2e, version 2 slightly
revised for publication | Phys. Rev. D 95, 125008 (2017) | 10.1103/PhysRevD.95.125008 | UFIFT-QG-17-01, CCTP-2017-1 | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use dimensional regularization in pure quantum gravity on de Sitter
background to evaluate the one loop expectation value of an invariant operator
which gives the local expansion rate. We show that the renormalization of this
nonlocal composite operator can be accomplished using the counterterms of a
simple local ... | [
{
"created": "Sun, 19 Feb 2017 03:14:11 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jul 2017 14:47:19 GMT",
"version": "v2"
}
] | 2017-07-17 | [
[
"Miao",
"S. P.",
"",
"NCKU, Taiwan"
],
[
"Tsamis",
"N. C.",
"",
"U. Crete"
],
[
"Woodard",
"R. P.",
"",
"U. Florida"
]
] | We use dimensional regularization in pure quantum gravity on de Sitter background to evaluate the one loop expectation value of an invariant operator which gives the local expansion rate. We show that the renormalization of this nonlocal composite operator can be accomplished using the counterterms of a simple local th... |
1709.03362 | David McNutt | D. D. McNutt, M. A. H. MacCallum, D. Gregoris, A. Forget, A. A. Coley,
P. C. Chavy-Waddy and D. Brooks | Cartan Invariants and Event Horizon Detection, Extended Version | 17 pages. This is an extended version of the article published in
General Relativity and gravitation, it includes additional examples.
Equations in sections 4 and 6 have been corrected | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that it is possible to locate the event horizons of a black hole (in
arbitrary dimensions) as the zeros of certain Cartan invariants. This approach
accounts for the recent results on the detection of stationary horizons using
scalar polynomial curvature invariants, and improves upon them since the
proposed me... | [
{
"created": "Mon, 11 Sep 2017 13:13:46 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Mar 2018 09:22:37 GMT",
"version": "v2"
},
{
"created": "Fri, 10 Jan 2020 13:57:28 GMT",
"version": "v3"
}
] | 2020-01-13 | [
[
"McNutt",
"D. D.",
""
],
[
"MacCallum",
"M. A. H.",
""
],
[
"Gregoris",
"D.",
""
],
[
"Forget",
"A.",
""
],
[
"Coley",
"A. A.",
""
],
[
"Chavy-Waddy",
"P. C.",
""
],
[
"Brooks",
"D.",
""
]
] | We show that it is possible to locate the event horizons of a black hole (in arbitrary dimensions) as the zeros of certain Cartan invariants. This approach accounts for the recent results on the detection of stationary horizons using scalar polynomial curvature invariants, and improves upon them since the proposed meth... |
2301.01337 | Anjali B Yelikar | A. B. Yelikar (1), V. Delfavero (1 and 2), R. O'Shaughnessy (1) ((1)
Rochester Institute of Technology, (2) NASA Goddard Space Flight Center) | Low-latency parameter inference enabled by a Gaussian likelihood
approximation for RIFT | 4 pages, 2 figures. Comments are welcome. arXiv admin note: text
overlap with arXiv:2011.03571 | null | null | LIGO DCC P2200368 | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Rapid identification, characterization, and localization of gravitational
waves from binary compact object mergers can enable well-informed follow-on
multimessenger observations. In this work, we investigate a small modification
to the RIFT parameter inference pipeline to enable extremely low-latency
inference, teste... | [
{
"created": "Tue, 3 Jan 2023 20:09:01 GMT",
"version": "v1"
}
] | 2023-01-05 | [
[
"Yelikar",
"A. B.",
"",
"1 and 2"
],
[
"Delfavero",
"V.",
"",
"1 and 2"
],
[
"O'Shaughnessy",
"R.",
""
]
] | Rapid identification, characterization, and localization of gravitational waves from binary compact object mergers can enable well-informed follow-on multimessenger observations. In this work, we investigate a small modification to the RIFT parameter inference pipeline to enable extremely low-latency inference, tested ... |
gr-qc/0610036 | Francesco Cianfrani dr | Francesco Cianfrani, Irene Milillo, Giovanni Montani | On the geometrization of the electro-magnetic interaction for a spinning
particle | 3 pages, proceedings of the XI Marcel Grossmann meeting on
Relativistic Astrophysics, July 23-29, 2006, Berlin | null | null | null | gr-qc | null | We outline that, in a Kaluza-Klein framework, not only the electro-magnetic
field can be geometrized, but also the dynamics of a charged spinning particle
can be inferred from the motion in a 5-dimensional space-time. This result is
achieved by the dimensional splitting of Papapetrou equations and by proper
identific... | [
{
"created": "Mon, 9 Oct 2006 15:37:58 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Oct 2006 10:07:52 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Cianfrani",
"Francesco",
""
],
[
"Milillo",
"Irene",
""
],
[
"Montani",
"Giovanni",
""
]
] | We outline that, in a Kaluza-Klein framework, not only the electro-magnetic field can be geometrized, but also the dynamics of a charged spinning particle can be inferred from the motion in a 5-dimensional space-time. This result is achieved by the dimensional splitting of Papapetrou equations and by proper identificat... |
gr-qc/0601001 | Carlos F. Sopuerta | A. Passamonti, M. Bruni, L. Gualtieri, A. Nagar, C. F. Sopuerta | Coupling of Radial and Axial non-Radial Oscillations of Compact Stars:
Gravitational Waves from first-order Differential Rotation | RevTeX 4. 23 pages, 13 figures | Phys.Rev. D73 (2006) 084010 | 10.1103/PhysRevD.73.084010 | null | gr-qc astro-ph | null | We investigate the non-linear coupling between radial and non-radial
oscillations of static spherically symmetric neutron stars as a possible
mechanism for the generation of gravitational waves that may lead to observable
signatures. In this paper we concentrate on the axial sector of the non-radial
perturbations. By... | [
{
"created": "Sat, 31 Dec 2005 17:20:27 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Passamonti",
"A.",
""
],
[
"Bruni",
"M.",
""
],
[
"Gualtieri",
"L.",
""
],
[
"Nagar",
"A.",
""
],
[
"Sopuerta",
"C. F.",
""
]
] | We investigate the non-linear coupling between radial and non-radial oscillations of static spherically symmetric neutron stars as a possible mechanism for the generation of gravitational waves that may lead to observable signatures. In this paper we concentrate on the axial sector of the non-radial perturbations. By u... |
2401.05613 | Simona J. Miller | Simona J. Miller, Zoe Ko, Thomas A. Callister, Katerina Chatziioannou | Gravitational waves carry information beyond effective spin parameters
but it is hard to extract | 29 pages including appendices and references, 16 figures | Phys. Rev. D 109, 104036 (2024) | 10.1103/PhysRevD.109.104036 | LIGO-P2300453 | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | Gravitational wave observations of binary black hole mergers probe their
astrophysical origins via the binary spin, namely the spin magnitudes and
directions of each component black hole, together described by six degrees of
freedom. However, the emitted signals primarily depend on two effective spin
parameters that ... | [
{
"created": "Thu, 11 Jan 2024 01:36:19 GMT",
"version": "v1"
},
{
"created": "Tue, 14 May 2024 02:09:49 GMT",
"version": "v2"
}
] | 2024-05-15 | [
[
"Miller",
"Simona J.",
""
],
[
"Ko",
"Zoe",
""
],
[
"Callister",
"Thomas A.",
""
],
[
"Chatziioannou",
"Katerina",
""
]
] | Gravitational wave observations of binary black hole mergers probe their astrophysical origins via the binary spin, namely the spin magnitudes and directions of each component black hole, together described by six degrees of freedom. However, the emitted signals primarily depend on two effective spin parameters that co... |
gr-qc/0002016 | Fredrik Andersson | Fredrik Andersson | Lanczos potentials and curvature-free connections aligned to a geodesic
shear-free expanding null congruence | 34 pages, LaTeX file; New section added, Slight changes in old
sections | null | null | null | gr-qc | null | By the method of rho-integration we obtain all Lanczos potentials L_{ABCA'}
of the Weyl spinor that, in a certain sense, are aligned to a geodesic
shear-free expanding null congruence. We also obtain all spinors
H_{ABA'B'}=Q_{AB}o_{A'}o_{B'}, Q_{AB}=Q_{(AB)} satisfying
nabla_{(A}{}^{B'}H_{BC)A'B'}=L_{ABCA'}. We go on... | [
{
"created": "Thu, 3 Feb 2000 10:15:50 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Apr 2000 12:27:01 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Andersson",
"Fredrik",
""
]
] | By the method of rho-integration we obtain all Lanczos potentials L_{ABCA'} of the Weyl spinor that, in a certain sense, are aligned to a geodesic shear-free expanding null congruence. We also obtain all spinors H_{ABA'B'}=Q_{AB}o_{A'}o_{B'}, Q_{AB}=Q_{(AB)} satisfying nabla_{(A}{}^{B'}H_{BC)A'B'}=L_{ABCA'}. We go on t... |
1301.1070 | Carlos A. R. Herdeiro | Flavio S. Coelho, Carlos Herdeiro and Mengjie Wang | n-DBI gravity, maximal slicing and the Kerr geometry | 3 pages | null | 10.1103/PhysRevD.87.047502 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, in arXiv:1110.0832, we have established that solutions of
Einstein's gravity admitting foliations with a certain geometric condition are
also solutions of n-DBI gravity, arXiv:1109.1468. Here we observe that, in
vacuum, the required geometric condition is fulfilled by the well known maximal
slicing, often u... | [
{
"created": "Sun, 6 Jan 2013 22:41:45 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Coelho",
"Flavio S.",
""
],
[
"Herdeiro",
"Carlos",
""
],
[
"Wang",
"Mengjie",
""
]
] | Recently, in arXiv:1110.0832, we have established that solutions of Einstein's gravity admitting foliations with a certain geometric condition are also solutions of n-DBI gravity, arXiv:1109.1468. Here we observe that, in vacuum, the required geometric condition is fulfilled by the well known maximal slicing, often use... |
2111.04767 | Shahram Jalalzadeh | S. Jalalzadeh, S. Abarghouei Nejad and P. V. Moniz | On the Hydrogen Atom in the Holographic Universe | 13 pages, to appear in Physica Scripta | Phys. Scr. 96 125320 (2021) | 10.1088/1402-4896/ac3958 | null | gr-qc hep-th math-ph math.MP quant-ph | http://creativecommons.org/licenses/by/4.0/ | We investigate the holographic bound utilizing a homogeneous, isotropic, and
non-relativistic neutral hydrogen gas present in the de Sitter space.
Concretely, we propose to employ de Sitter holography intertwined with quantum
deformation of the hydrogen atom using the framework of quantum groups.
Particularly, the $\... | [
{
"created": "Mon, 8 Nov 2021 19:01:39 GMT",
"version": "v1"
}
] | 2021-12-16 | [
[
"Jalalzadeh",
"S.",
""
],
[
"Nejad",
"S. Abarghouei",
""
],
[
"Moniz",
"P. V.",
""
]
] | We investigate the holographic bound utilizing a homogeneous, isotropic, and non-relativistic neutral hydrogen gas present in the de Sitter space. Concretely, we propose to employ de Sitter holography intertwined with quantum deformation of the hydrogen atom using the framework of quantum groups. Particularly, the $\ma... |
2106.10792 | Fengge Zhang | Fengge Zhang, Jiong Lin and Yizhou Lu | Double-peaked inflation model: Scalar induced gravitational waves and
primordial-black-hole suppression from primordial non-Gaussianity | 29 pages,7 figures | Phys. Rev. D 104, 063515 (2021) | 10.1103/PhysRevD.104.063515 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A significant abundance of primordial black hole (PBH) dark matter can be
produced by curvature perturbations with power spectrum
$\Delta_\zeta^2(k_{\mathrm{peak}})\sim \mathcal{O}(10^{-2})$ at small scales,
associated with the generation of observable scalar induced gravitational waves
(SIGWs). However, the primordi... | [
{
"created": "Mon, 21 Jun 2021 01:09:59 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Sep 2021 02:07:03 GMT",
"version": "v2"
}
] | 2021-09-09 | [
[
"Zhang",
"Fengge",
""
],
[
"Lin",
"Jiong",
""
],
[
"Lu",
"Yizhou",
""
]
] | A significant abundance of primordial black hole (PBH) dark matter can be produced by curvature perturbations with power spectrum $\Delta_\zeta^2(k_{\mathrm{peak}})\sim \mathcal{O}(10^{-2})$ at small scales, associated with the generation of observable scalar induced gravitational waves (SIGWs). However, the primordial... |
1311.4911 | Zahra Amirabi | Z. Amirabi | Black hole solution in third order Lovelock gravity has no Gauss-Bonnet
limit | 4 pages, 1 figure. Final version published in Phys. Rev. D | Phys. Rev. D 88, 087503 (2013) | 10.1103/PhysRevD.88.087503 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the spherically symmetric third order Lovelock black hole solution
in 7-dimensions. We show that the general solution for the metric function does
not admit the Gauss-Bonnet (GB) limit. This is not expected due to the linear
superposition of the second (GB) and third order Lovelock Lagrangians in the
gener... | [
{
"created": "Tue, 19 Nov 2013 22:38:15 GMT",
"version": "v1"
}
] | 2013-11-21 | [
[
"Amirabi",
"Z.",
""
]
] | We revisit the spherically symmetric third order Lovelock black hole solution in 7-dimensions. We show that the general solution for the metric function does not admit the Gauss-Bonnet (GB) limit. This is not expected due to the linear superposition of the second (GB) and third order Lovelock Lagrangians in the general... |
gr-qc/0012020 | Claudio M. G. de Sousa | Claudio M G de Sousa, Vanda Silveira | Slowly Rotating Boson Fermion Stars | 10 pages, RevTex. Changes on figure 2. Minor modifications on the
text | Int.J.Mod.Phys.D10:881,2001 | 10.1142/S0218271801001360 | ICCMP-2000-010 | gr-qc astro-ph | null | Relativistic prescription is used to study the slow rotation of stars
composed by self-gravitating bosons and fermions (fermions may be considered as
neutrons). Previous results demand that purely boson stars are unable to
display slow rotation, if one uses relativistic prescription with classical
scalar fields. In c... | [
{
"created": "Tue, 5 Dec 2000 16:11:41 GMT",
"version": "v1"
},
{
"created": "Sun, 4 Feb 2001 14:06:48 GMT",
"version": "v2"
}
] | 2010-11-19 | [
[
"de Sousa",
"Claudio M G",
""
],
[
"Silveira",
"Vanda",
""
]
] | Relativistic prescription is used to study the slow rotation of stars composed by self-gravitating bosons and fermions (fermions may be considered as neutrons). Previous results demand that purely boson stars are unable to display slow rotation, if one uses relativistic prescription with classical scalar fields. In con... |
1403.7700 | Yakov Itin | Yakov Itin | Covariant jump conditions in electromagnetism | null | Annals of Physics 327.2 (2012): 359-375 | 10.1016/j.aop.2011.09.005 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A generally covariant four-dimensional representation of Maxwell's
electrodynamics in a generic material medium can be achieved straightforwardly
in the metric-free formulation of electromagnetism. In this setup, the
electromagnetic phenomena described by two tensor fields, which satisfy
Maxwell's equations.
A gene... | [
{
"created": "Sun, 30 Mar 2014 04:18:53 GMT",
"version": "v1"
}
] | 2014-04-01 | [
[
"Itin",
"Yakov",
""
]
] | A generally covariant four-dimensional representation of Maxwell's electrodynamics in a generic material medium can be achieved straightforwardly in the metric-free formulation of electromagnetism. In this setup, the electromagnetic phenomena described by two tensor fields, which satisfy Maxwell's equations. A generic ... |
2305.08816 | Aisha Rashid | M. Farasat Shamir, Aisha Rashid | Bardeen Compact Stars in Modified $f(R)$ Gravity with Conformal Motion | 13 pages, 11 figures | Int. J. Geom. Methods Mod. Phys. 20 (2023) 2350026 | 10.1142/S0219887823500263 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The main emphasis of this paper is to find the viable solutions of Einstein
Maxwell fields equations of compact star in context of modified $f(R)$ theory
of gravity. Two different models of modified $f(R)$ gravity are considered. In
particular, we choose isotropic matter distribution and Bardeen's model for
compact s... | [
{
"created": "Mon, 15 May 2023 17:27:17 GMT",
"version": "v1"
}
] | 2023-05-16 | [
[
"Shamir",
"M. Farasat",
""
],
[
"Rashid",
"Aisha",
""
]
] | The main emphasis of this paper is to find the viable solutions of Einstein Maxwell fields equations of compact star in context of modified $f(R)$ theory of gravity. Two different models of modified $f(R)$ gravity are considered. In particular, we choose isotropic matter distribution and Bardeen's model for compact sta... |
gr-qc/0406079 | Charles Wang | Charles H-T Wang | Nonlinear quantum gravity on the constant mean curvature foliation | 14 pages. Classical and Quantum Gravity (To appear) | Class.Quant.Grav. 22 (2005) 33-45 | 10.1088/0264-9381/22/1/003 | null | gr-qc | null | A new approach to quantum gravity is presented based on a nonlinear
quantization scheme for canonical field theories with an implicitly defined
Hamiltonian. The constant mean curvature foliation is employed to eliminate the
momentum constraints in canonical general relativity. It is, however, argued
that the Hamilton... | [
{
"created": "Sun, 20 Jun 2004 10:59:06 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Nov 2004 13:32:27 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Wang",
"Charles H-T",
""
]
] | A new approach to quantum gravity is presented based on a nonlinear quantization scheme for canonical field theories with an implicitly defined Hamiltonian. The constant mean curvature foliation is employed to eliminate the momentum constraints in canonical general relativity. It is, however, argued that the Hamiltonia... |
1503.05551 | Christian Corda Prof. | Christian Corda | On quasi-normal modes, area quantization and Bohr correspondence
principle | 10 pages, accepted for publication in International Journal of
Theoretical Physics. Some typos have been corrected in this final version.
Some issues in the papers arXiv:1304.1899, arXiv:1503.00565 and
arXiv:1210.7747 has been carefully clarified and refined | Int. Journ. Theor. Phys. 54, 3841 (2015) | 10.1007/s10773-015-2625-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In Int. Journ. Mod. Phys. D 14, 181 (2005), the author Khriplovich verbatim
claims that "the correspondence principle does not dictate any relation between
the asymptotics of quasinormal modes and the spectrum of quantized black holes"
and that "this belief is in conflict with simple physical arguments". In this
pape... | [
{
"created": "Wed, 18 Mar 2015 13:29:39 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Mar 2015 12:55:54 GMT",
"version": "v2"
}
] | 2015-09-15 | [
[
"Corda",
"Christian",
""
]
] | In Int. Journ. Mod. Phys. D 14, 181 (2005), the author Khriplovich verbatim claims that "the correspondence principle does not dictate any relation between the asymptotics of quasinormal modes and the spectrum of quantized black holes" and that "this belief is in conflict with simple physical arguments". In this paper ... |
1111.5974 | Gustavo Dotti | Gustavo Dotti, Reinaldo J. Gleiser and Ignacio F. Ranea-Sandoval | Unstable fields in Kerr spacetimes | null | Class.Quant.Grav. 29 (2012) 095017 | 10.1088/0264-9381/29/9/095017 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that both the interior region $r<M-\sqrt{M^2-a^2}$ of a Kerr black
hole and the $a^2>M^2$ Kerr naked singularity admit unstable solutions of the
Teukolsky equation for any value of the spin weight. For every harmonic number
there is at least one axially symmetric mode that grows exponentially in time
and deca... | [
{
"created": "Fri, 25 Nov 2011 13:01:30 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Aug 2012 15:54:49 GMT",
"version": "v2"
}
] | 2012-08-10 | [
[
"Dotti",
"Gustavo",
""
],
[
"Gleiser",
"Reinaldo J.",
""
],
[
"Ranea-Sandoval",
"Ignacio F.",
""
]
] | We show that both the interior region $r<M-\sqrt{M^2-a^2}$ of a Kerr black hole and the $a^2>M^2$ Kerr naked singularity admit unstable solutions of the Teukolsky equation for any value of the spin weight. For every harmonic number there is at least one axially symmetric mode that grows exponentially in time and decays... |
1008.2955 | Mahdi Godazgar | Mahdi Godazgar | Spinor classification of the Weyl tensor in five dimensions | 40 pages | Class.Quant.Grav.27:245013,2010 | 10.1088/0264-9381/27/24/245013 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the spinor classification of the Weyl tensor in five
dimensions due to De Smet. We show that a previously overlooked reality
condition reduces the number of possible types in the classification. We
classify all vacuum solutions belonging to the most special algebraic type. The
connection between this s... | [
{
"created": "Tue, 17 Aug 2010 20:00:00 GMT",
"version": "v1"
}
] | 2010-11-30 | [
[
"Godazgar",
"Mahdi",
""
]
] | We investigate the spinor classification of the Weyl tensor in five dimensions due to De Smet. We show that a previously overlooked reality condition reduces the number of possible types in the classification. We classify all vacuum solutions belonging to the most special algebraic type. The connection between this spi... |
gr-qc/0502035 | Metin Gurses | Metin Gurses and Ozgur Sarioglu | Accelerated Levi-Civita-Bertotti-Robinson Metric in D-Dimensions | Latex File, 12 pages | Gen.Rel.Grav. 37 (2005) 2015-2022 | 10.1007/s10714-005-0176-y | null | gr-qc hep-th | null | A conformally flat accelerated charge metric is found in an arbitrary
dimension $D$. It is a solution of the Einstein-Maxwell-null fluid with a
cosmological constant in $D \ge 4$ dimensions. When the acceleration is zero
our solution reduces to the Levi-Civita-Bertotti-Robinson metric. We show that
the charge loses i... | [
{
"created": "Wed, 9 Feb 2005 12:10:49 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Gurses",
"Metin",
""
],
[
"Sarioglu",
"Ozgur",
""
]
] | A conformally flat accelerated charge metric is found in an arbitrary dimension $D$. It is a solution of the Einstein-Maxwell-null fluid with a cosmological constant in $D \ge 4$ dimensions. When the acceleration is zero our solution reduces to the Levi-Civita-Bertotti-Robinson metric. We show that the charge loses its... |
1609.02875 | Henri Roesch | Henri Roesch | Proof of a Null Penrose Conjecture using a new Quasi-local Mass | null | null | null | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We define an explicit quasi-local mass functional which is non-decreasing
along all foliations (satisfying a convexity assumption) of null cones. We use
this new functional to prove the null Penrose conjecture under fairly generic
conditions.
| [
{
"created": "Fri, 9 Sep 2016 17:47:06 GMT",
"version": "v1"
}
] | 2016-09-12 | [
[
"Roesch",
"Henri",
""
]
] | We define an explicit quasi-local mass functional which is non-decreasing along all foliations (satisfying a convexity assumption) of null cones. We use this new functional to prove the null Penrose conjecture under fairly generic conditions. |
1507.02902 | Giampiero Esposito Dr. | Emmanuele Battista, Simone Dell'Agnello, Giampiero Esposito, Luciano
Di Fiore, Jules Simo, Aniello Grado | Earth-Moon Lagrangian points as a testbed for general relativity and
effective field theories of gravity | 41 pages, 9 figures. Comments in the very end of Sec. VI have been
amended and shortened. The last typos have been corrected | Phys. Rev. D92, 064045 (2015) | 10.1103/PhysRevD.92.064045 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the restricted four-body problem consisting of the Earth, the Moon and the
Sun as the primaries and a spacecraft as the planetoid, we take into account
the solar perturbation in the description of the motion of a spacecraft in the
vicinity of the stable Earth-Moon libration points L4 and L5 both in the
classical r... | [
{
"created": "Fri, 10 Jul 2015 13:55:35 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Sep 2015 14:21:18 GMT",
"version": "v2"
},
{
"created": "Thu, 12 May 2016 12:41:45 GMT",
"version": "v3"
},
{
"created": "Sun, 15 May 2016 16:27:51 GMT",
"version": "v4"
}
] | 2016-05-17 | [
[
"Battista",
"Emmanuele",
""
],
[
"Dell'Agnello",
"Simone",
""
],
[
"Esposito",
"Giampiero",
""
],
[
"Di Fiore",
"Luciano",
""
],
[
"Simo",
"Jules",
""
],
[
"Grado",
"Aniello",
""
]
] | In the restricted four-body problem consisting of the Earth, the Moon and the Sun as the primaries and a spacecraft as the planetoid, we take into account the solar perturbation in the description of the motion of a spacecraft in the vicinity of the stable Earth-Moon libration points L4 and L5 both in the classical reg... |
1711.09627 | Roberto A. Sussman | Germ\'an Izquierdo, Roberto C Blanquet-Jaramillo and Roberto A Sussman | Interactive mixture of inhomogeneous dark fluids driven by dark energy:
a dynamical systems analysis | 23 pages, IOP format, 8 figures | null | 10.1140/epjc/s10052-018-5699-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the evolution of an inhomogeneous mixture of non-relativistic
pressureless cold dark matter (CDM), coupled to dark energy (DE) characterised
by the equation of state parameter $w<-1/3$, with the interaction term
proportional to the DE density. This coupled mixture is the source of a
spherically symmetric L... | [
{
"created": "Mon, 27 Nov 2017 11:32:37 GMT",
"version": "v1"
}
] | 2018-04-18 | [
[
"Izquierdo",
"Germán",
""
],
[
"Blanquet-Jaramillo",
"Roberto C",
""
],
[
"Sussman",
"Roberto A",
""
]
] | We examine the evolution of an inhomogeneous mixture of non-relativistic pressureless cold dark matter (CDM), coupled to dark energy (DE) characterised by the equation of state parameter $w<-1/3$, with the interaction term proportional to the DE density. This coupled mixture is the source of a spherically symmetric Lem... |
gr-qc/0104047 | Juan Eloy Ayon Beato | Eloy Ay\'on-Beato, Alberto Garc\'ia, Alfredo Mac\'ias, Hernando
Quevedo | Static Black Holes of Metric-Affine Gravity in the Presence of Matter | 19 pages, RevTex, accepted for publication in Phys. Rev. D;
duplication of refs. corrected | Phys.Rev.D64:024026,2001 | 10.1103/PhysRevD.64.024026 | null | gr-qc | null | We investigate spherically symmetric and static gravitational fields
representing black hole configurations in the framework of metric-affine gauge
theories of gravity (MAG) in the presence of different matter fields. It is
shown that in the triplet ansatz sector of MAG, black hole configurations in
the presence of n... | [
{
"created": "Mon, 16 Apr 2001 20:25:22 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Apr 2001 19:28:26 GMT",
"version": "v2"
}
] | 2016-08-16 | [
[
"Ayón-Beato",
"Eloy",
""
],
[
"García",
"Alberto",
""
],
[
"Macías",
"Alfredo",
""
],
[
"Quevedo",
"Hernando",
""
]
] | We investigate spherically symmetric and static gravitational fields representing black hole configurations in the framework of metric-affine gauge theories of gravity (MAG) in the presence of different matter fields. It is shown that in the triplet ansatz sector of MAG, black hole configurations in the presence of non... |
2109.06901 | Paul Chesler | Paul M. Chesler | Hairy black resonators and the AdS$_4$ superradiant instability | 12 pages, 7 figures, v2: typos corrected and minor clarifications
added | null | 10.1103/PhysRevD.105.024026 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The superradiant instability of Kerr-AdS black holes is studied by
numerically solving the full 3+1 dimensional Einstein equations. We find that
the superradiant instability results in a two stage process with distinct
initial and secondary instabilities. At the end of the secondary instability
the geometry oscillate... | [
{
"created": "Tue, 14 Sep 2021 18:01:38 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Sep 2021 14:48:36 GMT",
"version": "v2"
}
] | 2022-01-19 | [
[
"Chesler",
"Paul M.",
""
]
] | The superradiant instability of Kerr-AdS black holes is studied by numerically solving the full 3+1 dimensional Einstein equations. We find that the superradiant instability results in a two stage process with distinct initial and secondary instabilities. At the end of the secondary instability the geometry oscillates ... |
1302.5253 | Valter Moretti | Giovanni Collini (Leipzig U.), Valter Moretti (Trento U.), Nicola
Pinamonti (Genova U.) | Tunnelling black-hole radiation with $\phi^3$ self-interaction: one-loop
computation for Rindler Killing horizons | Some changes in the text, acknowledgments added, accepted for
publication in Letters in Mathematical Physics | Lett. Math. Phys. 104 (2014) 217-232 | 10.1007/s11005-013-0663-0 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Tunnelling processes through black hole horizons have recently been
investigated in the framework of WKB theory discovering interesting interplay
with the Hawking radiation. A more precise and general account of that
phenomenon has been subsequently given within the framework of QFT in curved
spacetime by two of the ... | [
{
"created": "Thu, 21 Feb 2013 11:27:49 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Feb 2013 15:08:19 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Apr 2013 12:47:46 GMT",
"version": "v3"
},
{
"created": "Wed, 16 Oct 2013 11:56:34 GMT",
"version": "v4"
}
] | 2014-01-21 | [
[
"Collini",
"Giovanni",
"",
"Leipzig U."
],
[
"Moretti",
"Valter",
"",
"Trento U."
],
[
"Pinamonti",
"Nicola",
"",
"Genova U."
]
] | Tunnelling processes through black hole horizons have recently been investigated in the framework of WKB theory discovering interesting interplay with the Hawking radiation. A more precise and general account of that phenomenon has been subsequently given within the framework of QFT in curved spacetime by two of the au... |
1204.0055 | Yuri Bonder | Yuri Bonder | Lorentz Invariant Phenomenological Model of Quantum Gravity: A
Minimalistic Presentation | Work presented at the IX Workshop of the Mexican Gravity Division | null | 10.1063/1.4748552 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The purpose of this paper is to give a minimalistic and self-contained
presentation of a Lorentz Invariant phenomenological model of Quantum Gravity.
| [
{
"created": "Sat, 31 Mar 2012 01:15:00 GMT",
"version": "v1"
}
] | 2015-06-04 | [
[
"Bonder",
"Yuri",
""
]
] | The purpose of this paper is to give a minimalistic and self-contained presentation of a Lorentz Invariant phenomenological model of Quantum Gravity. |
2107.01738 | Daniela Doneva | Daniela D. Doneva, Stoytcho S. Yazadjiev | Beyond the spontaneous scalarization: New fully nonlinear dynamical
mechanism for formation of scalarized black holes | additionally, classes of sGB theories are considered where both the
standard and the nonlinear scalarization are present with a smooth connection
between both; 8 pages, 6 figures | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present letter we show the existence of a fully nonlinear dynamical
mechanism for the formation of scalarized black holes which is different from
the spontaneous scalarization. We consider a class of scalar-Gauss-Bonnet
gravity theories within which no tachyonic instability can occur. Although the
Schwarzschil... | [
{
"created": "Sun, 4 Jul 2021 21:26:36 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Nov 2021 07:21:10 GMT",
"version": "v2"
}
] | 2021-11-05 | [
[
"Doneva",
"Daniela D.",
""
],
[
"Yazadjiev",
"Stoytcho S.",
""
]
] | In the present letter we show the existence of a fully nonlinear dynamical mechanism for the formation of scalarized black holes which is different from the spontaneous scalarization. We consider a class of scalar-Gauss-Bonnet gravity theories within which no tachyonic instability can occur. Although the Schwarzschild ... |
2405.12644 | Hassan Basari V.T. | Hassan Basari V. T. | Unified formalism for the emergence of space in non-equilibrium
description | 11 Pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Previous studies indicate that the expansion law in emergence of space can be
derived from the first law f thermodynamics. It has been proposed a unified
formulation for the expansion law applicable to a general set of gravity
theories in equilibrium description. In that formulation, which is based on the
first law o... | [
{
"created": "Tue, 21 May 2024 09:55:34 GMT",
"version": "v1"
}
] | 2024-05-22 | [
[
"T.",
"Hassan Basari V.",
""
]
] | Previous studies indicate that the expansion law in emergence of space can be derived from the first law f thermodynamics. It has been proposed a unified formulation for the expansion law applicable to a general set of gravity theories in equilibrium description. In that formulation, which is based on the first law of ... |
1112.0488 | Llu\'is Bel | Llu\'is Bel | Uniform rotation | 6 pages, formula (18) changed, Sect. 2 improved | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe the space-time model of a uniformly rotating frame of reference
satisfying the Helmholtz free mobility postulate, as we implemented it in a
preceding article \cite{Bel1}, and we discuss the implications of this model as
it concerns the problematic of the one way or two ways velocity of light
derived from ... | [
{
"created": "Fri, 2 Dec 2011 15:51:57 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Dec 2011 19:22:27 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Jan 2015 08:54:35 GMT",
"version": "v3"
}
] | 2015-01-15 | [
[
"Bel",
"Lluís",
""
]
] | We describe the space-time model of a uniformly rotating frame of reference satisfying the Helmholtz free mobility postulate, as we implemented it in a preceding article \cite{Bel1}, and we discuss the implications of this model as it concerns the problematic of the one way or two ways velocity of light derived from th... |
gr-qc/0612146 | Gregory Adkins | Gregory S. Adkins, Jordan McDonnell, Richard N. Fell | Cosmological perturbations on local systems | 10 pages | Phys.Rev.D75:064011,2007 | 10.1103/PhysRevD.75.064011 | null | gr-qc | null | We study the effect of cosmological expansion on orbits--galactic, planetary,
or atomic--subject to an inverse-square force law. We obtain the laws of motion
for gravitational or electrical interactions from general relativity--in
particular, we find the gravitational field of a mass distribution in an
expanding univ... | [
{
"created": "Fri, 22 Dec 2006 15:35:16 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Adkins",
"Gregory S.",
""
],
[
"McDonnell",
"Jordan",
""
],
[
"Fell",
"Richard N.",
""
]
] | We study the effect of cosmological expansion on orbits--galactic, planetary, or atomic--subject to an inverse-square force law. We obtain the laws of motion for gravitational or electrical interactions from general relativity--in particular, we find the gravitational field of a mass distribution in an expanding univer... |
1711.01276 | Wolfgang Wieland | Wolfgang Wieland | Quantum gravity in three dimensions, Witten spinors and the quantisation
of length | 22 pages, one figure | Nuclear Physics B 930 (2018) 219-234 | 10.1016/j.nuclphysb.2018.02.022 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, I investigate the quantisation of length in euclidean quantum
gravity in three dimensions. The starting point is the classical hamiltonian
formalism in a cylinder of finite radius. At this finite boundary, a counter
term is introduced that couples the gravitational field in the interior to a
two-dimens... | [
{
"created": "Fri, 3 Nov 2017 18:00:08 GMT",
"version": "v1"
}
] | 2018-04-06 | [
[
"Wieland",
"Wolfgang",
""
]
] | In this paper, I investigate the quantisation of length in euclidean quantum gravity in three dimensions. The starting point is the classical hamiltonian formalism in a cylinder of finite radius. At this finite boundary, a counter term is introduced that couples the gravitational field in the interior to a two-dimensio... |
2003.11748 | Teruaki Suyama | Teruaki Suyama | On arrival time difference between lensed gravitational waves and light | Version published in ApJ | null | 10.3847/1538-4357/ab8d3f | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is known that geometrical optics no longer applies to the gravitational
lensing if the wavelength of a propagating wave becomes comparable to or larger
than the Schwarzshild radius of a lensing object. We investigate the
propagation of gravitational waves in wave optics, particularly focusing on the
difference bet... | [
{
"created": "Thu, 26 Mar 2020 05:32:39 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Jul 2020 10:16:01 GMT",
"version": "v2"
}
] | 2020-07-23 | [
[
"Suyama",
"Teruaki",
""
]
] | It is known that geometrical optics no longer applies to the gravitational lensing if the wavelength of a propagating wave becomes comparable to or larger than the Schwarzshild radius of a lensing object. We investigate the propagation of gravitational waves in wave optics, particularly focusing on the difference betwe... |
2201.00743 | Pardyumn Kumar Sahoo | Oleksii Sokoliuk, Zinnat Hassan, P. K. Sahoo, Alexander Baransky | Traversable wormholes with charge and non-commutative geometry in the
$f(Q)$ gravity | Annals of Physics revised version | Annals of Physics, 443 (2022) 168968 | 10.1016/j.aop.2022.168968 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider modified symmetric teleparallel gravity (STG), in which
gravitational Lagrangian is given by the arbitrary function of non-metricity
scalar $Q$ to study static and spherically symmetric charged traversable
wormhole solutions with non-commutative background geometry. The matter source
at the wormhole throa... | [
{
"created": "Mon, 3 Jan 2022 16:37:10 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Mar 2022 16:12:14 GMT",
"version": "v2"
},
{
"created": "Sun, 22 May 2022 12:50:28 GMT",
"version": "v3"
},
{
"created": "Fri, 10 Jun 2022 11:21:59 GMT",
"version": "v4"
}
] | 2022-06-30 | [
[
"Sokoliuk",
"Oleksii",
""
],
[
"Hassan",
"Zinnat",
""
],
[
"Sahoo",
"P. K.",
""
],
[
"Baransky",
"Alexander",
""
]
] | We consider modified symmetric teleparallel gravity (STG), in which gravitational Lagrangian is given by the arbitrary function of non-metricity scalar $Q$ to study static and spherically symmetric charged traversable wormhole solutions with non-commutative background geometry. The matter source at the wormhole throat ... |
gr-qc/0309018 | Yi Ling | Yi Ling and Hongbao Zhang | Quasinormal modes prefer supersymmetry ? | 3 pages | Phys.Rev. D68 (2003) 101501 | 10.1103/PhysRevD.68.101501 | null | gr-qc hep-th | null | One ambiguity in loop quantum gravity is the appearance of a free parameter
which is called Immirzi parameter. Recently Dreyer has argued that this
parameter may be fixed by considering the quasinormal mode spectrum of black
holes, while at the price of changing the gauge group to SO(3) rather than the
original one S... | [
{
"created": "Wed, 3 Sep 2003 09:18:29 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Ling",
"Yi",
""
],
[
"Zhang",
"Hongbao",
""
]
] | One ambiguity in loop quantum gravity is the appearance of a free parameter which is called Immirzi parameter. Recently Dreyer has argued that this parameter may be fixed by considering the quasinormal mode spectrum of black holes, while at the price of changing the gauge group to SO(3) rather than the original one SU(... |
2204.09040 | Elda Guzman Elda Guzman-Herrera | Elda Guzman-Herrera, Nora Breton | Light propagating in a Born-Infeld background as seen by an accelerated
observer | 32 pages, 15 figures | null | 10.1002/andp.202200043 | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We study the propagation of light in the Born-Infeld (BI) background as seen
by an accelerated observer. In a Born-Infeld electromagnetic field, light
trajectories are governed by the null geodesics of the effective optical
metric. The accelerated observer is in a Rindler frame, a situation that,
according to the Ein... | [
{
"created": "Tue, 19 Apr 2022 17:58:34 GMT",
"version": "v1"
}
] | 2022-08-24 | [
[
"Guzman-Herrera",
"Elda",
""
],
[
"Breton",
"Nora",
""
]
] | We study the propagation of light in the Born-Infeld (BI) background as seen by an accelerated observer. In a Born-Infeld electromagnetic field, light trajectories are governed by the null geodesics of the effective optical metric. The accelerated observer is in a Rindler frame, a situation that, according to the Einst... |
0907.3596 | Luc Blanchet | Luc Blanchet | Post-Newtonian theory and the two-body problem | 42 pages, to appear in the book "Mass and Motion in General
Relativity", proceedings of the C.N.R.S. School in Orleans, France, eds. L.
Blanchet, A. Spallicci and B. Whiting | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Reliable predictions of general relativity theory are extracted using
approximation methods. Among these, the powerful post-Newtonian approximation
provides us with our best insights into the problems of motion and
gravitational radiation of systems of compact objects. This approximation has
reached an impressive mat... | [
{
"created": "Tue, 21 Jul 2009 09:53:53 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Mar 2010 19:25:17 GMT",
"version": "v2"
}
] | 2010-03-12 | [
[
"Blanchet",
"Luc",
""
]
] | Reliable predictions of general relativity theory are extracted using approximation methods. Among these, the powerful post-Newtonian approximation provides us with our best insights into the problems of motion and gravitational radiation of systems of compact objects. This approximation has reached an impressive matur... |
2404.02630 | Ana Luc\'ia Baez-Camargo | Ana Luc\'ia B\'aez-Camargo, Daniel Hartley, Christian K\"ading, Ivette
Fuentes-Guridi | Dynamical Casimir effect with screened scalar fields | 16+6 pages, 2 figures, 1 table | null | null | null | gr-qc astro-ph.CO hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Understanding the nature of dark energy and dark matter is one of modern
physics' greatest open problems. Scalar-tensor theories with screened scalar
fields like the chameleon model are among the most popular proposed solutions.
In this article, we present the first analysis of the impact of a chameleon
field on the ... | [
{
"created": "Wed, 3 Apr 2024 10:36:42 GMT",
"version": "v1"
}
] | 2024-04-09 | [
[
"Báez-Camargo",
"Ana Lucía",
""
],
[
"Hartley",
"Daniel",
""
],
[
"Käding",
"Christian",
""
],
[
"Fuentes-Guridi",
"Ivette",
""
]
] | Understanding the nature of dark energy and dark matter is one of modern physics' greatest open problems. Scalar-tensor theories with screened scalar fields like the chameleon model are among the most popular proposed solutions. In this article, we present the first analysis of the impact of a chameleon field on the dy... |
1602.07434 | Alan Cornell | G. E. Harmsen, C. H. Chen, H. T. Cho and A. S. Cornell | Absorption probabilities associated with spin-3/2 particles near
$N$-dimensional Schwarzschild black holes | 6 pages, 2 figures, to appear in the proceedings of the High Energy
Particle Physics Workshop 2016 (iThemba Labs, Johannesburg, South Africa) | null | 10.1088/1742-6596/802/1/012002 | WITS-MITP-021 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In June 2015 the Large Hadron Collider was able to produce collisions with an
energy of 13TeV, where collisions at these energy levels may allow for the
formation of higher dimensional black holes. In order to detect these higher
dimensional black holes we require an understanding of their emission spectra.
One way o... | [
{
"created": "Wed, 24 Feb 2016 08:54:54 GMT",
"version": "v1"
}
] | 2017-04-05 | [
[
"Harmsen",
"G. E.",
""
],
[
"Chen",
"C. H.",
""
],
[
"Cho",
"H. T.",
""
],
[
"Cornell",
"A. S.",
""
]
] | In June 2015 the Large Hadron Collider was able to produce collisions with an energy of 13TeV, where collisions at these energy levels may allow for the formation of higher dimensional black holes. In order to detect these higher dimensional black holes we require an understanding of their emission spectra. One way of ... |
gr-qc/0512079 | Ezra Newman | Ezra T. Newman | Asymptotic twistor Theory and the Kerr Theorem | 11 | Class.Quant.Grav. 23 (2006) 3385-3392 | 10.1088/0264-9381/23/10/009 | null | gr-qc | null | We first review asymptotic twistor theory with its real subspace of null
asymptotic twistors. This is followed by a description of an asymptotic version
of the Kerr theorem that produces regular asymptotically shear free null
geodesic congruences in arbitrary asymptotically flat Einstein or
Einstein-Maxwell spacetime... | [
{
"created": "Tue, 13 Dec 2005 19:00:05 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Newman",
"Ezra T.",
""
]
] | We first review asymptotic twistor theory with its real subspace of null asymptotic twistors. This is followed by a description of an asymptotic version of the Kerr theorem that produces regular asymptotically shear free null geodesic congruences in arbitrary asymptotically flat Einstein or Einstein-Maxwell spacetimes. |
gr-qc/0102019 | Julien Sylvestre | Julien Sylvestre | A nonlinear detection algorithm for periodic signals in gravitational
wave detectors | 9 pages, 3 figures, to appear in Phys. Rev. D | Phys.Rev. D63 (2001) 082004 | 10.1103/PhysRevD.63.082004 | null | gr-qc | null | We present an algorithm for the detection of periodic sources of
gravitational waves with interferometric detectors that is based on a special
symmetry of the problem: the contributions to the phase modulation of the
signal from the earth rotation are exactly equal and opposite at any two
instants of time separated b... | [
{
"created": "Tue, 6 Feb 2001 02:28:00 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Sylvestre",
"Julien",
""
]
] | We present an algorithm for the detection of periodic sources of gravitational waves with interferometric detectors that is based on a special symmetry of the problem: the contributions to the phase modulation of the signal from the earth rotation are exactly equal and opposite at any two instants of time separated by ... |
1606.06558 | Saheb Soroushfar | Bahareh Hoseini, Reza Saffari, Saheb Soroushfar | Study of the geodesic equations of a spherical symmetric spacetime in
conformal gravity | 23 pages,1 table,23 figures | Classical and Quantum Gravity, 2017 (34) | 10.1088/1361-6382/aa5a63 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Set of analytic solutions of the geodesic equation in a spherical conformal
spacetime is presented. Solutions of this geodesics can be expressed in terms
of the Weierstrass {\wp} function and the Kleinian {\sigma} function. Using
conserved energy and angular momentum we can characterize the different orbits.
Also, co... | [
{
"created": "Tue, 21 Jun 2016 13:23:45 GMT",
"version": "v1"
}
] | 2020-04-07 | [
[
"Hoseini",
"Bahareh",
""
],
[
"Saffari",
"Reza",
""
],
[
"Soroushfar",
"Saheb",
""
]
] | Set of analytic solutions of the geodesic equation in a spherical conformal spacetime is presented. Solutions of this geodesics can be expressed in terms of the Weierstrass {\wp} function and the Kleinian {\sigma} function. Using conserved energy and angular momentum we can characterize the different orbits. Also, cons... |
gr-qc/0110105 | Iver H. Brevik | I. Brevik and S. D. Odintsov | On the Cardy-Verlinde Entropy Formula in Viscous Cosmology | 11 pages, LaTeX, no figures. Discussion added in Sec. 2. To appear in
Phys. Rev. D | Phys.Rev.D65:067302,2002 | 10.1103/PhysRevD.65.067302 | null | gr-qc hep-th | null | The results of the paper of Verlinde [hep-th/0008140], discussing the
holographic principle in a radiation dominated universe, are extended when
allowing the cosmic fluid to possess a bulk viscosity. This corresponds to a
non-conformally invariant theory. The generalization of the Cardy-Verlinde
entropy formula to th... | [
{
"created": "Wed, 24 Oct 2001 11:54:11 GMT",
"version": "v1"
},
{
"created": "Sat, 29 Dec 2001 15:06:05 GMT",
"version": "v2"
}
] | 2009-01-14 | [
[
"Brevik",
"I.",
""
],
[
"Odintsov",
"S. D.",
""
]
] | The results of the paper of Verlinde [hep-th/0008140], discussing the holographic principle in a radiation dominated universe, are extended when allowing the cosmic fluid to possess a bulk viscosity. This corresponds to a non-conformally invariant theory. The generalization of the Cardy-Verlinde entropy formula to the ... |
gr-qc/0111045 | Wu Shuangqin | S. Q. Wu, X. Cai | Hawking Radiation of Photons in a Vaidya-de Sitter Black Hole | Latex, 10 pages, no figure, to appear in Int. J. Theor. Phys. 41
(2002) No. 3 | Int.J.Theor.Phys. 41 (2002) 559-567 | null | null | gr-qc | null | Hawking evaporation of photons in a Vaidya-de Sitter black hole is
investigated by using the method of generalized tortoise coordinate
transformation. Both the location and the temperature of the event horizon
depend on the time. It is shown that Hawking radiation of photons exists only
for the complex Maxwell scalar... | [
{
"created": "Thu, 15 Nov 2001 08:54:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wu",
"S. Q.",
""
],
[
"Cai",
"X.",
""
]
] | Hawking evaporation of photons in a Vaidya-de Sitter black hole is investigated by using the method of generalized tortoise coordinate transformation. Both the location and the temperature of the event horizon depend on the time. It is shown that Hawking radiation of photons exists only for the complex Maxwell scalar $... |
2203.14610 | Andronikos Paliathanasis | Andronikos Paliathanasis | Hyperbolic inflation in the Jordan frame | 16 pages, 3 figures | Universe 2022, 8(4), 199 | 10.3390/universe8040199 | null | gr-qc hep-ph math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | We consider a multi-scalar field model in the Jordan frame which can be seen
as a two-scalar field model where the Brans-Dicke field interacts in the
kinetic part with the second scalar field. This theory under a conformal
transformation reduces to the hyperbolic inflation. We show that scaling
solutions and the de S... | [
{
"created": "Mon, 28 Mar 2022 09:43:51 GMT",
"version": "v1"
}
] | 2022-03-29 | [
[
"Paliathanasis",
"Andronikos",
""
]
] | We consider a multi-scalar field model in the Jordan frame which can be seen as a two-scalar field model where the Brans-Dicke field interacts in the kinetic part with the second scalar field. This theory under a conformal transformation reduces to the hyperbolic inflation. We show that scaling solutions and the de Sit... |
1003.5108 | S Habib Mazharimousavi | S. Habib Mazharimousavi and M. Halilsoy | Revisiting the dyonic Majumdar-Papapetrou black holes | 16 pages, 3 figures. | TJP 40, 163 (2016) | 10.3906/fiz-1506-19 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the Majumdar-Papapetrou (MP) solution of the Einstein-Maxwell (EM)
equations which is implied generally for static electric charge in non-rotating
metrics to encompass equally well magnetic charges. In the absence of Higgs and
non-Abelian gauge fields, 'dyonic' is to be understood in this simpler sense.
Cos... | [
{
"created": "Fri, 26 Mar 2010 10:50:53 GMT",
"version": "v1"
}
] | 2016-05-31 | [
[
"Mazharimousavi",
"S. Habib",
""
],
[
"Halilsoy",
"M.",
""
]
] | We extend the Majumdar-Papapetrou (MP) solution of the Einstein-Maxwell (EM) equations which is implied generally for static electric charge in non-rotating metrics to encompass equally well magnetic charges. In the absence of Higgs and non-Abelian gauge fields, 'dyonic' is to be understood in this simpler sense. Cosmo... |
1901.03965 | Antoine Folacci | Antoine Folacci and Mohamed Ould El Hadj | Regge pole description of scattering of scalar and electromagnetic waves
by a Schwarzschild black hole | v2: We have added some considerations relevant to the long-wavelength
regime in order to emphasize the role of background integrals. v3: Close to
the published version. We have provided an analytical approximation
describing both the black hole glory and the orbiting oscillations | Phys. Rev. D 99, 104079 (2019) | 10.1103/PhysRevD.99.104079 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the problem of scalar and electromagnetic waves impinging upon a
Schwarzschild black hole from complex angular momentum techniques. We focus
more particularly on the associated differential scattering cross sections. We
derive an exact representation of the corresponding scattering amplitudes by
replacing ... | [
{
"created": "Sun, 13 Jan 2019 12:02:32 GMT",
"version": "v1"
},
{
"created": "Sun, 10 Feb 2019 17:44:25 GMT",
"version": "v2"
},
{
"created": "Sun, 2 Jun 2019 05:14:06 GMT",
"version": "v3"
}
] | 2019-06-04 | [
[
"Folacci",
"Antoine",
""
],
[
"Hadj",
"Mohamed Ould El",
""
]
] | We revisit the problem of scalar and electromagnetic waves impinging upon a Schwarzschild black hole from complex angular momentum techniques. We focus more particularly on the associated differential scattering cross sections. We derive an exact representation of the corresponding scattering amplitudes by replacing th... |
1811.01330 | Deobrat Singh | Deobrat Singh and Supriya Kar | Emergent D-instanton as a source of Dark Energy | 11 pages, Typos corrected and added new citations | Brazilian Journal of Physics 2019 | 10.1007/s13538-019-00635-y | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit a non-perturbative formulation leading to a vacuum created
gravitational pair of (33)-brane by a Poincare dual higher form U (1) gauge
theory on a D4 -brane. In particular, the analysis has revealed a dynamical
geometric torsion H 3 for an on-shell Neveu-Schwarz (NS) form on a fat 4-brane.
We argue that a ... | [
{
"created": "Sun, 4 Nov 2018 07:33:44 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Nov 2018 08:48:42 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Feb 2019 00:29:52 GMT",
"version": "v3"
}
] | 2019-02-15 | [
[
"Singh",
"Deobrat",
""
],
[
"Kar",
"Supriya",
""
]
] | We revisit a non-perturbative formulation leading to a vacuum created gravitational pair of (33)-brane by a Poincare dual higher form U (1) gauge theory on a D4 -brane. In particular, the analysis has revealed a dynamical geometric torsion H 3 for an on-shell Neveu-Schwarz (NS) form on a fat 4-brane. We argue that a D-... |
1209.6218 | Hassan Hamad | M. I. Wanas and H. A. Hassan | Torsion and Problems of Standard Cosmology | 18 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The field equation of orthodox general relativity are written in the context
of a geometry with non-vanishing torsion, the Absolute Parallelism (AP)
geometry. An AP-structure, with homogeneity and isotropy, is used for
cosmological applications. The resulting dynamical equations are those of
FRW-Standard cosmology, w... | [
{
"created": "Thu, 27 Sep 2012 13:23:01 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Nov 2012 10:39:04 GMT",
"version": "v2"
},
{
"created": "Wed, 7 Nov 2012 07:37:20 GMT",
"version": "v3"
}
] | 2012-11-08 | [
[
"Wanas",
"M. I.",
""
],
[
"Hassan",
"H. A.",
""
]
] | The field equation of orthodox general relativity are written in the context of a geometry with non-vanishing torsion, the Absolute Parallelism (AP) geometry. An AP-structure, with homogeneity and isotropy, is used for cosmological applications. The resulting dynamical equations are those of FRW-Standard cosmology, whi... |
1604.03662 | Lijing Shao | Lijing Shao, Norbert Wex | Tests of gravitational symmetries with radio pulsars | 23 pages, 9 figures. Invited review article, minor modifications to
match published version | Science China Physics, Mechanics & Astronomy 59, 699501 (2016) | 10.1007/s11433-016-0087-6 | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Symmetries play important roles in modern theories of physical laws. In this
paper, we review several experimental tests of important symmetries associated
with the gravitational interaction, including the universality of free fall for
self-gravitating bodies, time-shift symmetry in the gravitational constant,
local ... | [
{
"created": "Wed, 13 Apr 2016 05:47:19 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Jul 2016 13:46:51 GMT",
"version": "v2"
}
] | 2016-07-26 | [
[
"Shao",
"Lijing",
""
],
[
"Wex",
"Norbert",
""
]
] | Symmetries play important roles in modern theories of physical laws. In this paper, we review several experimental tests of important symmetries associated with the gravitational interaction, including the universality of free fall for self-gravitating bodies, time-shift symmetry in the gravitational constant, local po... |
gr-qc/9210011 | null | Chris J. Isham | Canonical Quantum Gravity and the Problem of Time | 125 pages of LaTeX output | null | null | Imperial/TP/91-92/25 | gr-qc | null | This is the write-up of my lectures at the NATO Summer School held in
Salamanca in June 1992. The paper deals with the problem of time in quantum
gravity. All the major schemes are reviewed. Please note that the paper is in
two parts for ease of email transmission; this is part 1. The mailer from gr-qc
may further su... | [
{
"created": "Wed, 21 Oct 1992 14:54:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Isham",
"Chris J.",
""
]
] | This is the write-up of my lectures at the NATO Summer School held in Salamanca in June 1992. The paper deals with the problem of time in quantum gravity. All the major schemes are reviewed. Please note that the paper is in two parts for ease of email transmission; this is part 1. The mailer from gr-qc may further subd... |
gr-qc/0107070 | Abhik Kumar Sanyal | A.K.Sanyal and B.Modak | Quantum Cosmology With R+R^2 Gravity | 8 pages, Latex2e | Class.Quant.Grav.19:515-526,2002 | 10.1088/0264-9381/19/3/307 | null | gr-qc | null | Canonical quantization of an action containing curvature squared term
requires introduction of an auxiliary variable. Boulware etal[1] prescribed a
technique to choose such a variable, by taking derivative of an action with
respect to the highest derivative of the field variable, present in the
action.It has been sho... | [
{
"created": "Sat, 21 Jul 2001 08:27:12 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Sanyal",
"A. K.",
""
],
[
"Modak",
"B.",
""
]
] | Canonical quantization of an action containing curvature squared term requires introduction of an auxiliary variable. Boulware etal[1] prescribed a technique to choose such a variable, by taking derivative of an action with respect to the highest derivative of the field variable, present in the action.It has been shown... |
gr-qc/0302106 | Kunihito Ioka | Kunihito Ioka, Misao Sasaki | Grad-Shafranov equation in noncircular stationary axisymmetric
spacetimes | 17 pages, accepted for publication in Physical Review D, proof
corrections added | Phys.Rev.D67:124026,2003 | 10.1103/PhysRevD.67.124026 | null | gr-qc astro-ph | null | A formulation is developed for general relativistic ideal
magnetohydrodynamics in stationary axisymmetric spacetimes. We reduce basic
equations to a single second-order partial differential equation, the so-called
Grad-Shafranov (GS) equation. Our formulation is most general in the sense that
it is applicable even wh... | [
{
"created": "Wed, 26 Feb 2003 10:18:38 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Mar 2003 00:54:37 GMT",
"version": "v2"
},
{
"created": "Sat, 19 Apr 2003 10:31:48 GMT",
"version": "v3"
},
{
"created": "Fri, 2 May 2003 11:38:51 GMT",
"version": "v4"
},
{
"cr... | 2009-10-09 | [
[
"Ioka",
"Kunihito",
""
],
[
"Sasaki",
"Misao",
""
]
] | A formulation is developed for general relativistic ideal magnetohydrodynamics in stationary axisymmetric spacetimes. We reduce basic equations to a single second-order partial differential equation, the so-called Grad-Shafranov (GS) equation. Our formulation is most general in the sense that it is applicable even when... |
gr-qc/9305019 | null | A.A. Starobinsky | New Restrictions on Spatial Topology of the Universe from Microwave
Background Temperature Fluctuations | 4 pages, report LANDAU-93-04/GR-1 | JETP Lett. 57 (1993) 622-625 | null | null | gr-qc astro-ph | null | If the Universe has the topology of a 3-torus ($T^3$), then it follows from
recent data on large-scale temperature fluctuations $\Delta T/T$ of the cosmic
microwave background that either the minimal size of the torus is at least of
the order of the present cosmological horizon, or the large-scale $\Delta T/T$
patter... | [
{
"created": "Sun, 23 May 1993 09:32:58 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Starobinsky",
"A. A.",
""
]
] | If the Universe has the topology of a 3-torus ($T^3$), then it follows from recent data on large-scale temperature fluctuations $\Delta T/T$ of the cosmic microwave background that either the minimal size of the torus is at least of the order of the present cosmological horizon, or the large-scale $\Delta T/T$ pattern ... |
2306.12793 | Bobur Turimov | Bobur Turimov and Igor Smolyaninov | Curved spacetime as a dispersive multiferroic medium for an
electromagnetic wave: polarization and magnetization vectors in the
Schwarzschild spacetime | 11 pages, 3 figures, to be accepted to Chinese Journal of Physics | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study one of the interesting properties of the electromagnetic wave
propagation in the curved Schwarzschild background spacetime in the framework
of general relativity (GR). The electromagnetic wave equation has been derived
from vacuum general relativistic Maxwell's equations. It is shown that the
solutions for t... | [
{
"created": "Thu, 22 Jun 2023 10:49:07 GMT",
"version": "v1"
}
] | 2023-06-23 | [
[
"Turimov",
"Bobur",
""
],
[
"Smolyaninov",
"Igor",
""
]
] | We study one of the interesting properties of the electromagnetic wave propagation in the curved Schwarzschild background spacetime in the framework of general relativity (GR). The electromagnetic wave equation has been derived from vacuum general relativistic Maxwell's equations. It is shown that the solutions for the... |
0808.2025 | F\'abio Dahia | F. Dahia, C. Romero, M. A. S. Cruz | Effective Field Equations of Brane-Induced Electromagnetism | null | J.Math.Phys.49:112501,2008 | 10.1063/1.3019866 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using a covariant embedding formalism, we find the effective field equations
for the Electromagnetism that emerge on branes in the context of
Dvali-Gabadadze-Porrati (DGP) braneworld scenario. Our treatment is essentially
geometrical. We start with Maxwell equations in five-dimensions and project
them into an arbitra... | [
{
"created": "Thu, 14 Aug 2008 16:42:34 GMT",
"version": "v1"
}
] | 2008-12-18 | [
[
"Dahia",
"F.",
""
],
[
"Romero",
"C.",
""
],
[
"Cruz",
"M. A. S.",
""
]
] | Using a covariant embedding formalism, we find the effective field equations for the Electromagnetism that emerge on branes in the context of Dvali-Gabadadze-Porrati (DGP) braneworld scenario. Our treatment is essentially geometrical. We start with Maxwell equations in five-dimensions and project them into an arbitrary... |
2301.13228 | Silvia Gasparotto | Silvia Gasparotto, Rodrigo Vicente, Diego Blas, Alexander C. Jenkins,
Enrico Barausse | Can gravitational-wave memory help constrain binary black-hole
parameters? A LISA case study | 16 pages, comments are welcomed | null | 10.1103/PhysRevD.107.124033 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | Besides the transient effect, the passage of a gravitational wave also causes
a persistent displacement in the relative position of an interferometer's test
masses through the \emph{nonlinear memory effect}. This effect is generated by
the gravitational backreaction of the waves themselves, and encodes additional
inf... | [
{
"created": "Mon, 30 Jan 2023 19:00:15 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Jun 2023 09:38:55 GMT",
"version": "v2"
}
] | 2023-06-29 | [
[
"Gasparotto",
"Silvia",
""
],
[
"Vicente",
"Rodrigo",
""
],
[
"Blas",
"Diego",
""
],
[
"Jenkins",
"Alexander C.",
""
],
[
"Barausse",
"Enrico",
""
]
] | Besides the transient effect, the passage of a gravitational wave also causes a persistent displacement in the relative position of an interferometer's test masses through the \emph{nonlinear memory effect}. This effect is generated by the gravitational backreaction of the waves themselves, and encodes additional infor... |
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