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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1205.3370 | Edward Wilson-Ewing | Edward Wilson-Ewing | Lattice loop quantum cosmology: scalar perturbations | 32 pages, v2: Minor changes | Class.Quant.Grav.29:215013,2012 | 10.1088/0264-9381/29/21/215013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the scalar modes of linear perturbations in loop quantum cosmology.
This is done on a lattice where each cell is taken to be homogeneous and
isotropic and can be quantized via standard homogeneous loop quantum cosmology
techniques. The appropriate interactions between nearby cells are included in
the Hamilto... | [
{
"created": "Tue, 15 May 2012 13:45:09 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Sep 2012 12:27:37 GMT",
"version": "v2"
}
] | 2015-06-05 | [
[
"Wilson-Ewing",
"Edward",
""
]
] | We study the scalar modes of linear perturbations in loop quantum cosmology. This is done on a lattice where each cell is taken to be homogeneous and isotropic and can be quantized via standard homogeneous loop quantum cosmology techniques. The appropriate interactions between nearby cells are included in the Hamiltoni... |
2104.00427 | Sanjar Shaymatov | Naresh Dadhich, Sanjar Shaymatov | Circular orbits around higher dimensional Einstein and pure Gauss-Bonnet
rotating black holes | 16 pages, 13 figures, 2 tables | Physics of the Dark Universe 35, 100986 (2022) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study circular orbits around higher dimensional rotating
Myers-Perry and pure Gauss-Bonnet (GB) black holes. It turns out that for the
former there occurs no potential well to harbour bound and thereby stable
circular orbits. The only circular orbits that could occur are all unstable and
their radius... | [
{
"created": "Thu, 1 Apr 2021 12:18:10 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Apr 2021 10:44:42 GMT",
"version": "v2"
},
{
"created": "Mon, 4 Apr 2022 12:28:34 GMT",
"version": "v3"
}
] | 2022-04-05 | [
[
"Dadhich",
"Naresh",
""
],
[
"Shaymatov",
"Sanjar",
""
]
] | In this paper we study circular orbits around higher dimensional rotating Myers-Perry and pure Gauss-Bonnet (GB) black holes. It turns out that for the former there occurs no potential well to harbour bound and thereby stable circular orbits. The only circular orbits that could occur are all unstable and their radius i... |
gr-qc/0606101 | Piotr T. Chru\'sciel | Piotr T. Chru\'sciel | Conformal boundary extensions of Lorentzian manifolds | 24 pages | null | null | preprint AEI-2006-039 | gr-qc | null | We study the question of local and global uniqueness of completions, based on
null geodesics, of Lorentzian manifolds. We show local uniqueness of such
boundary extensions. We give a necessary and sufficient condition for existence
of unique maximal completions. The condition is verified in several situations
of inte... | [
{
"created": "Fri, 23 Jun 2006 07:11:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Chruściel",
"Piotr T.",
""
]
] | We study the question of local and global uniqueness of completions, based on null geodesics, of Lorentzian manifolds. We show local uniqueness of such boundary extensions. We give a necessary and sufficient condition for existence of unique maximal completions. The condition is verified in several situations of intere... |
1710.02922 | Junbin Li | Jue Liu, Junbin Li | A robust proof of the instability of naked singularities of a scalar
field in spherical symmetry | 14 pages | null | 10.1007/s00220-018-3157-1 | null | gr-qc math.AP math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Published in 1999, Christodoulou proved that the naked singularities of a
self-gravitating scalar field are not stable in spherical symmetry and
therefore the cosmic censorship conjecture is true in this context. The
original proof is by contradiction and sharp estimates are obtained strictly
depending on spherical s... | [
{
"created": "Mon, 9 Oct 2017 02:57:54 GMT",
"version": "v1"
}
] | 2018-07-04 | [
[
"Liu",
"Jue",
""
],
[
"Li",
"Junbin",
""
]
] | Published in 1999, Christodoulou proved that the naked singularities of a self-gravitating scalar field are not stable in spherical symmetry and therefore the cosmic censorship conjecture is true in this context. The original proof is by contradiction and sharp estimates are obtained strictly depending on spherical sym... |
1003.0172 | Sergey Paston | S.A. Paston, A.N. Semenova | Constraint algebra for Regge-Teitelboim formulation of gravity | LaTeX, 12 pages; in this version the misprints in eq. (37) and (41)
was corrected | Int. J. Theor. Phys. 2010. V. 49. N 11. P. 2648-2658 | 10.1007/s10773-010-0456-5 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the formulation of the gravity theory first suggested by Regge
and Teitelboim where the space-time is a four-dimensional surface in a flat
ten-dimensional space. We investigate a canonical formalism for this theory
following the approach suggested by Regge and Teitelboim. Under constructing
the canonical ... | [
{
"created": "Sun, 28 Feb 2010 10:07:03 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Oct 2010 15:47:28 GMT",
"version": "v2"
},
{
"created": "Sat, 22 Nov 2014 22:25:52 GMT",
"version": "v3"
}
] | 2015-05-18 | [
[
"Paston",
"S. A.",
""
],
[
"Semenova",
"A. N.",
""
]
] | We consider the formulation of the gravity theory first suggested by Regge and Teitelboim where the space-time is a four-dimensional surface in a flat ten-dimensional space. We investigate a canonical formalism for this theory following the approach suggested by Regge and Teitelboim. Under constructing the canonical fo... |
2212.10270 | Robert Sansom | Robert Sansom, Juan A. Valiente Kroon | Dain's invariant for black hole initial data | 33 pages | null | 10.1088/1361-6382/accccb | null | gr-qc math-ph math.AP math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dynamical black holes in the non-perturbative regime are not mathematically
well understood. Studying approximate symmetries of spacetimes describing
dynamical black holes gives an insight into their structure. Utilising the
property that approximate symmetries coincide with actual symmetries when they
are present al... | [
{
"created": "Tue, 20 Dec 2022 14:20:11 GMT",
"version": "v1"
}
] | 2023-05-10 | [
[
"Sansom",
"Robert",
""
],
[
"Kroon",
"Juan A. Valiente",
""
]
] | Dynamical black holes in the non-perturbative regime are not mathematically well understood. Studying approximate symmetries of spacetimes describing dynamical black holes gives an insight into their structure. Utilising the property that approximate symmetries coincide with actual symmetries when they are present allo... |
gr-qc/9712022 | Edward Malec | Edward Malec, Niall \'O Murchadha and Tadeusz Chmaj | Spherical scalar waves and gravity - red shift and backscattering | Revtex, 16 pages, 3 figures | Class.Quant.Grav.15:1653-1668,1998 | 10.1088/0264-9381/15/6/019 | null | gr-qc astro-ph | null | This article investigates the interaction of a spherically symmetric massless
scalar field with a strong gravitational field. It focuses on the propagation
of waves in regions outside any horizons. The two factors acting on the waves
can be identified as a redshift and a backscattering. The influence of
backscatterin... | [
{
"created": "Wed, 3 Dec 1997 17:45:29 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Malec",
"Edward",
""
],
[
"Murchadha",
"Niall Ó",
""
],
[
"Chmaj",
"Tadeusz",
""
]
] | This article investigates the interaction of a spherically symmetric massless scalar field with a strong gravitational field. It focuses on the propagation of waves in regions outside any horizons. The two factors acting on the waves can be identified as a redshift and a backscattering. The influence of backscattering ... |
1105.4465 | Narayan Banerjee | Koyel Ganguly and Narayan Banerjee | Collapse of non-spherically symmetric scalar field distributions | 13 pages, 9 figures; Accepted for publication in Gen Relativ Gravit
(2011) | Gen.Rel.Grav.43:2141-2155,2011 | 10.1007/s10714-011-1177-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present work the collapse scenario of some exact non-spherical models
with a minimally coupled scalar field is studied. Scalar field collapse with
planar as well as toroidal, cylindrical and pseudoplanar symmetries have been
investigated. It is shown that the scalar field may have collapsing modes even
if it h... | [
{
"created": "Mon, 23 May 2011 10:59:41 GMT",
"version": "v1"
}
] | 2011-07-21 | [
[
"Ganguly",
"Koyel",
""
],
[
"Banerjee",
"Narayan",
""
]
] | In the present work the collapse scenario of some exact non-spherical models with a minimally coupled scalar field is studied. Scalar field collapse with planar as well as toroidal, cylindrical and pseudoplanar symmetries have been investigated. It is shown that the scalar field may have collapsing modes even if it has... |
2101.05191 | Raihaneh Moti | Raihaneh Moti, Ali Shojai (Tehran U.) | On the Quantum Improved Affine Gravity | 30 pages, 6 figures | Phys.Dark Univ. 32 (2021) 100829 | 10.1016/j.dark.2021.100829 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Improvement of the classical gravity with the running gravitational coupling
obtained from asymptotically safe gravity, is a good way of considering the
effects of quantum gravity. This is usually done for metric theories of
gravity. Here we investigate the effects of such an improvement for pure affine
theories of g... | [
{
"created": "Wed, 13 Jan 2021 16:50:37 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Mar 2021 16:13:51 GMT",
"version": "v2"
},
{
"created": "Fri, 30 Apr 2021 09:26:11 GMT",
"version": "v3"
}
] | 2021-05-05 | [
[
"Moti",
"Raihaneh",
"",
"Tehran U."
],
[
"Shojai",
"Ali",
"",
"Tehran U."
]
] | Improvement of the classical gravity with the running gravitational coupling obtained from asymptotically safe gravity, is a good way of considering the effects of quantum gravity. This is usually done for metric theories of gravity. Here we investigate the effects of such an improvement for pure affine theories of gra... |
1303.6463 | Gilberto Medeiros Kremer | Gilberto M. Kremer | Diffusion of relativistic gas mixtures in gravitational fields | 13 pages | Physica A, vol. 393, 76-85 (2014) | 10.1016/j.physa.2013.09.019 | null | gr-qc cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A mixture of relativistic gases of non-disparate rest masses in a
Schwarzschild metric is studied on the basis of a relativistic Boltzmann
equation in the presence of gravitational fields. A BGK-type model equation of
the collision operator of the Boltzmann equation is used in order to compute
the non-equilibrium dis... | [
{
"created": "Tue, 26 Mar 2013 12:53:30 GMT",
"version": "v1"
}
] | 2014-04-15 | [
[
"Kremer",
"Gilberto M.",
""
]
] | A mixture of relativistic gases of non-disparate rest masses in a Schwarzschild metric is studied on the basis of a relativistic Boltzmann equation in the presence of gravitational fields. A BGK-type model equation of the collision operator of the Boltzmann equation is used in order to compute the non-equilibrium distr... |
1705.09533 | Graham Shore | Graham M. Shore | A New Twist on the Geometry of Gravitational Plane Waves | 60 pages, 2 figures. Extended version with new material on Rosen
geodesics and isometries. Title changed | null | 10.1007/JHEP09(2017)039 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The geometry of twisted null geodesic congruences in gravitational plane wave
spacetimes is explored, with special focus on homogeneous plane waves. The role
of twist in the relation of the Rosen coordinates adapted to a null congruence
with the fundamental Brinkmann coordinates is explained and a generalised form
of... | [
{
"created": "Fri, 26 May 2017 11:15:48 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Jul 2017 16:35:02 GMT",
"version": "v2"
}
] | 2017-10-11 | [
[
"Shore",
"Graham M.",
""
]
] | The geometry of twisted null geodesic congruences in gravitational plane wave spacetimes is explored, with special focus on homogeneous plane waves. The role of twist in the relation of the Rosen coordinates adapted to a null congruence with the fundamental Brinkmann coordinates is explained and a generalised form of t... |
2303.03240 | Ren Tsuda | Ren Tsuda, Shinya Tomizawa and Ryotaku Suzuki | Acoustic black and white holes of potential flow in a tube | 17 pages, 8 figures | null | 10.1103/PhysRevD.107.104020 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new simple model of acoustic black hole in a thin tube, where
the difference in the gravitational potential is used to create a transonic
flow. The main merit of our transonic flow model is that the Euler equations
can be solved analytically. In fact, we can obtain an exact solution to the
equation in te... | [
{
"created": "Mon, 6 Mar 2023 15:56:08 GMT",
"version": "v1"
},
{
"created": "Mon, 8 May 2023 21:08:54 GMT",
"version": "v2"
}
] | 2023-05-30 | [
[
"Tsuda",
"Ren",
""
],
[
"Tomizawa",
"Shinya",
""
],
[
"Suzuki",
"Ryotaku",
""
]
] | We propose a new simple model of acoustic black hole in a thin tube, where the difference in the gravitational potential is used to create a transonic flow. The main merit of our transonic flow model is that the Euler equations can be solved analytically. In fact, we can obtain an exact solution to the equation in term... |
2310.03798 | Ofri Telem | Majed Khalaf, and Ofri Telem | The Quantum Spectral Method: From Atomic Orbitals to Classical
Self-Force | null | null | null | null | gr-qc hep-ph hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | Can classical systems be described analytically at all orders in their
interaction strength? For periodic and approximately periodic systems, the
answer is yes, as we show in this work. Our analytical approach, which we call
the \textit{Quantum Spectral Method}, is based on a novel application of Bohr's
correspondenc... | [
{
"created": "Thu, 5 Oct 2023 18:00:03 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Nov 2023 09:04:12 GMT",
"version": "v2"
},
{
"created": "Tue, 9 Apr 2024 12:14:46 GMT",
"version": "v3"
}
] | 2024-04-10 | [
[
"Khalaf",
"Majed",
""
],
[
"Telem",
"Ofri",
""
]
] | Can classical systems be described analytically at all orders in their interaction strength? For periodic and approximately periodic systems, the answer is yes, as we show in this work. Our analytical approach, which we call the \textit{Quantum Spectral Method}, is based on a novel application of Bohr's correspondence ... |
1403.3038 | Michele Arzano | Michele Arzano, Danilo Latini and Matteo Lotito | Group Momentum Space and Hopf Algebra Symmetries of Point Particles
Coupled to 2+1 Gravity | null | SIGMA 10 (2014), 079, 23 pages | 10.3842/SIGMA.2014.079 | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-sa/3.0/ | We present an in-depth investigation of the ${\rm SL}(2,\mathbb{R})$ momentum
space describing point particles coupled to Einstein gravity in three
space-time dimensions. We introduce different sets of coordinates on the group
manifold and discuss their properties under Lorentz transformations. In
particular we show ... | [
{
"created": "Wed, 12 Mar 2014 17:27:07 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Jul 2014 05:31:14 GMT",
"version": "v2"
}
] | 2014-07-25 | [
[
"Arzano",
"Michele",
""
],
[
"Latini",
"Danilo",
""
],
[
"Lotito",
"Matteo",
""
]
] | We present an in-depth investigation of the ${\rm SL}(2,\mathbb{R})$ momentum space describing point particles coupled to Einstein gravity in three space-time dimensions. We introduce different sets of coordinates on the group manifold and discuss their properties under Lorentz transformations. In particular we show ho... |
1708.09137 | Huang Zhiqiang | Zhiqiang Huang and Qing-yu Cai | Gravitational baryogenesis of vacuum Inflation | null | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that in the vacuum inflation model, the gravitational baryogenesis
mechanism will produce the baryon asymmetry. We analyze the evolution of
entropy and baryon number in the vacuum inflation model. The comparison between
dilution speed and the chemical potential may give a natural interpretation for
decouple t... | [
{
"created": "Wed, 30 Aug 2017 06:50:43 GMT",
"version": "v1"
}
] | 2017-08-31 | [
[
"Huang",
"Zhiqiang",
""
],
[
"Cai",
"Qing-yu",
""
]
] | We show that in the vacuum inflation model, the gravitational baryogenesis mechanism will produce the baryon asymmetry. We analyze the evolution of entropy and baryon number in the vacuum inflation model. The comparison between dilution speed and the chemical potential may give a natural interpretation for decouple tem... |
1501.06135 | Peng Huang | Fang-Fang Yuan, Peng Huang | Induced geometry from disformal transformation | 15 pages, references added | Physics Letters B (2015) pp. 120-124 | 10.1016/j.physletb.2015.03.031 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this note, we use the disformal transformation to induce a geometry from
the manifold which is originally Riemannian. The new geometry obtained here can
be considered as a generalization of Weyl integrable geometry. Based on these
results, we further propose a geometry which is naturally a generalization of
Weyl g... | [
{
"created": "Sun, 25 Jan 2015 09:35:02 GMT",
"version": "v1"
},
{
"created": "Sun, 8 Feb 2015 05:12:10 GMT",
"version": "v2"
}
] | 2015-04-02 | [
[
"Yuan",
"Fang-Fang",
""
],
[
"Huang",
"Peng",
""
]
] | In this note, we use the disformal transformation to induce a geometry from the manifold which is originally Riemannian. The new geometry obtained here can be considered as a generalization of Weyl integrable geometry. Based on these results, we further propose a geometry which is naturally a generalization of Weyl geo... |
1704.03634 | Sergey Chervon | Igor V. Fomin and Sergey V. Chervon | Exact Inflation in Einstein-Gauss-Bonnet Gravity | 9 pages; Extended talk given at the Ulyanovsk International
School-Seminar "Problems of theoretical and observation cosmology - UISS
2016", September 19-30, 2016, Ulyanovsk, Russia; submitted to Gravitation and
Cosmology | null | 10.1134/S0202289317040090 | LGAC2017/CH1 and LMME2017/F1 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study cosmological inflation in the Einstein gravity model, where
additionally the Gauss-Bonnet term non-minimally coupled to a scalar field is
included. We prove that inflationary solutions of exponential and power-law
types are allowable and we found few examples of them. We also proposed the
method of the exact... | [
{
"created": "Wed, 12 Apr 2017 06:24:11 GMT",
"version": "v1"
}
] | 2017-12-06 | [
[
"Fomin",
"Igor V.",
""
],
[
"Chervon",
"Sergey V.",
""
]
] | We study cosmological inflation in the Einstein gravity model, where additionally the Gauss-Bonnet term non-minimally coupled to a scalar field is included. We prove that inflationary solutions of exponential and power-law types are allowable and we found few examples of them. We also proposed the method of the exact i... |
1403.6984 | Guillermo A. Mena Marugan | Laura Castell\'o Gomar and Guillermo A. Mena Marug\'an | Uniqueness of the Fock quantization of scalar fields and processes with
signature change in cosmology | 11 pages, version accepted for publication in Physical Review D | null | 10.1103/PhysRevD.89.084052 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study scalar fields subject to an equation of the Klein-Gordon type in
nonstationary spacetimes, such as those found in cosmology, assuming that all
the relevant spatial dependence is contained in the Laplacian. We show that the
field description ---with a specific canonical pair--- and the Fock
representation for... | [
{
"created": "Thu, 27 Mar 2014 11:47:06 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Gomar",
"Laura Castelló",
""
],
[
"Marugán",
"Guillermo A. Mena",
""
]
] | We study scalar fields subject to an equation of the Klein-Gordon type in nonstationary spacetimes, such as those found in cosmology, assuming that all the relevant spatial dependence is contained in the Laplacian. We show that the field description ---with a specific canonical pair--- and the Fock representation for t... |
gr-qc/0310063 | Mauro Sereno | M. Sereno | Weak field limit of Reissner-Nordstrom black hole lensing | 8 pages, to appear in Phys. Rev. D | Phys.Rev. D69 (2004) 023002 | 10.1103/PhysRevD.69.023002 | null | gr-qc astro-ph | null | We study gravitational lensing by a Reissner-Nordstrom (RN) black hole in the
weak field limit. We obtain the basic equations for the deflection angle and
time delay and find analytical expressions for the positions and amplifications
of the primary and secondary images. Due to a net positive charge, the
separation b... | [
{
"created": "Mon, 13 Oct 2003 17:04:16 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Sereno",
"M.",
""
]
] | We study gravitational lensing by a Reissner-Nordstrom (RN) black hole in the weak field limit. We obtain the basic equations for the deflection angle and time delay and find analytical expressions for the positions and amplifications of the primary and secondary images. Due to a net positive charge, the separation bet... |
gr-qc/9708024 | Zloshchastiev Konstantin | Konstantin G. Zloshchastiev (Dnepropetrovsk State University, Ukraine) | Monopole and electrically charged dust thin shells in general
relativity: Classical and quantum comparison of hollow and atomlike
configurations | 18 pages, REVTeX 3.1 | Phys. Rev. D 57, 4812 (1998) | 10.1103/PhysRevD.57.4812 | null | gr-qc hep-th | null | We give a comparative description of monopole and electrically charged
spherically symmetric dust thin shells. Herewith we consider two of the most
interesting configurations: the hollow shell and shell, surrounding a body with
opposite charge. The classification of shells in accordance with the types of
black holes ... | [
{
"created": "Tue, 12 Aug 1997 10:57:46 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Aug 1997 08:55:17 GMT",
"version": "v2"
},
{
"created": "Mon, 22 Dec 1997 14:03:03 GMT",
"version": "v3"
},
{
"created": "Mon, 27 Apr 1998 14:54:13 GMT",
"version": "v4"
}
] | 2016-08-25 | [
[
"Zloshchastiev",
"Konstantin G.",
"",
"Dnepropetrovsk State University, Ukraine"
]
] | We give a comparative description of monopole and electrically charged spherically symmetric dust thin shells. Herewith we consider two of the most interesting configurations: the hollow shell and shell, surrounding a body with opposite charge. The classification of shells in accordance with the types of black holes an... |
1112.2270 | Hao Wei | Hao Wei, Xiao-Jiao Guo, Long-Fei Wang | Noether Symmetry in $f(T)$ Theory | 12 pages, 2 figures, revtex4; v2: discussions added, Phys. Lett. B in
press; v3: published version | Phys.Lett.B707:298-304,2012 | 10.1016/j.physletb.2011.12.039 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As is well known, symmetry plays an important role in the theoretical
physics. In particular, the well-known Noether symmetry is an useful tool to
select models motivated at a fundamental level, and find the exact solution to
the given Lagrangian. In the present work, we try to consider Noether symmetry
in $f(T)$ the... | [
{
"created": "Sat, 10 Dec 2011 12:00:00 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Dec 2011 16:19:00 GMT",
"version": "v2"
},
{
"created": "Sun, 8 Jan 2012 12:24:00 GMT",
"version": "v3"
}
] | 2012-01-10 | [
[
"Wei",
"Hao",
""
],
[
"Guo",
"Xiao-Jiao",
""
],
[
"Wang",
"Long-Fei",
""
]
] | As is well known, symmetry plays an important role in the theoretical physics. In particular, the well-known Noether symmetry is an useful tool to select models motivated at a fundamental level, and find the exact solution to the given Lagrangian. In the present work, we try to consider Noether symmetry in $f(T)$ theor... |
gr-qc/0109083 | Roman Petryk | Roman Petryk and Kristin Schleich | Conditional probabilities in Ponzano-Regge minisuperspace | 26 pages including 10 figures, some reorganization in the
presentation of results, expanded discussion of results in the context of 2+1
gravity in the Witten variables, 3 new references | Phys.Rev.D67:024019,2003 | 10.1103/PhysRevD.67.024019 | null | gr-qc | null | We examine the Hartle-Hawking no-boundary initial state for the Ponzano-Regge
formulation of gravity in three dimensions. We consider the behavior of
conditional probabilities and expectation values for geometrical quantities in
this initial state for a simple minisuperspace model consisting of a
two-parameter set of... | [
{
"created": "Tue, 25 Sep 2001 04:12:49 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Jul 2002 03:28:33 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Petryk",
"Roman",
""
],
[
"Schleich",
"Kristin",
""
]
] | We examine the Hartle-Hawking no-boundary initial state for the Ponzano-Regge formulation of gravity in three dimensions. We consider the behavior of conditional probabilities and expectation values for geometrical quantities in this initial state for a simple minisuperspace model consisting of a two-parameter set of a... |
1206.0927 | Simen Braeck | Simen Braeck, Oystein Elgaroy | A physical interpretation of Hubble's law and the cosmological redshift
from the perspective of a static observer | 5 pages, added references; accepted for publication in General
Relativity and Gravitation | General Relativity and Gravitation 44, 2603 (2012) | 10.1007/s10714-012-1417-5 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive explicit and exact expressions for the physical velocity of a free
particle comoving with the Hubble flow as measured by a static observer, and
for the frequency shift of light emitted by a comoving source and received,
again, by a static observer. The expressions make it clear that an
interpretation of the... | [
{
"created": "Tue, 5 Jun 2012 13:34:36 GMT",
"version": "v1"
},
{
"created": "Sat, 21 Jul 2012 09:16:43 GMT",
"version": "v2"
}
] | 2012-09-04 | [
[
"Braeck",
"Simen",
""
],
[
"Elgaroy",
"Oystein",
""
]
] | We derive explicit and exact expressions for the physical velocity of a free particle comoving with the Hubble flow as measured by a static observer, and for the frequency shift of light emitted by a comoving source and received, again, by a static observer. The expressions make it clear that an interpretation of the r... |
gr-qc/0410109 | Di Sword | D. Lynden-Bell | Electromagnetic Magic: The Relativistically Rotating Disk | 10 pages, one figure | Phys.Rev. D70 (2004) 105017 | 10.1103/PhysRevD.70.105017 | null | gr-qc | null | A closed form analytic solution is found for the electromagnetic field of the
charged uniformly rotating conducting disk for all values of the tip speed $v$
up to $c$. For $v=c$ it becomes the Magic field of the Kerr-Newman black hole
with $G$ set to zero.
The field energy, field angular momentum and gyromagnetic r... | [
{
"created": "Thu, 21 Oct 2004 13:48:16 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Lynden-Bell",
"D.",
""
]
] | A closed form analytic solution is found for the electromagnetic field of the charged uniformly rotating conducting disk for all values of the tip speed $v$ up to $c$. For $v=c$ it becomes the Magic field of the Kerr-Newman black hole with $G$ set to zero. The field energy, field angular momentum and gyromagnetic ratio... |
1503.09154 | Jakub Mielczarek Ph.D. | Martin Bojowald, Jakub Mielczarek | Some implications of signature-change in cosmological models of loop
quantum gravity | 35 pages, 5 figures | JCAP 08 (2015) 052 | 10.1088/1475-7516/2015/08/052 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Signature change at high density has been obtained as a possible consequence
of deformed space-time structures in models of loop quantum gravity. This
article provides a conceptual discussion of implications for cosmological
scenarios, based on an application of mathematical results for mixed-type
partial differentia... | [
{
"created": "Tue, 31 Mar 2015 18:29:03 GMT",
"version": "v1"
}
] | 2016-01-19 | [
[
"Bojowald",
"Martin",
""
],
[
"Mielczarek",
"Jakub",
""
]
] | Signature change at high density has been obtained as a possible consequence of deformed space-time structures in models of loop quantum gravity. This article provides a conceptual discussion of implications for cosmological scenarios, based on an application of mathematical results for mixed-type partial differential ... |
0705.2194 | Kuiroukidis | A Kuiroukidis, K Kleidis, D B Papadopoulos and L Vlahos | Excitation of MHD waves in magnetized anisotropic cosmologies | 12 pages, RevTex, 5 figures ps, accepted for publication to Astronomy
and Astrophysics | null | 10.1051/0004-6361:20077109 | null | gr-qc | null | The excitation of cosmological perturbations in an anisotropic cosmological
model and in the presence of a homogeneous magnetic field was studied, using
the resistive magnetohydrodynamic (MHD) equations. We have shown that
fast-magnetosonic modes, propagating normal to the magnetic field grow
exponentially and satura... | [
{
"created": "Tue, 15 May 2007 17:29:47 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Kuiroukidis",
"A",
""
],
[
"Kleidis",
"K",
""
],
[
"Papadopoulos",
"D B",
""
],
[
"Vlahos",
"L",
""
]
] | The excitation of cosmological perturbations in an anisotropic cosmological model and in the presence of a homogeneous magnetic field was studied, using the resistive magnetohydrodynamic (MHD) equations. We have shown that fast-magnetosonic modes, propagating normal to the magnetic field grow exponentially and saturate... |
gr-qc/0611072 | Tobias Keidl | Tobias S. Keidl, John L. Friedman, Alan G. Wiseman | On finding fields and self-force in a gauge appropriate to separable
wave equations | 58 pages, 5 tables, typographical errors corrected | Phys.Rev.D75:124009,2007 | 10.1103/PhysRevD.75.124009 | null | gr-qc | null | Gravitational waves from the inspiral of a stellar-size black hole to a
supermassive black hole can be accurately approximated by a point particle
moving in a Kerr background. This paper presents progress on finding the
electromagnetic and gravitational field of a point particle in a black-hole
spacetime and on compu... | [
{
"created": "Tue, 14 Nov 2006 04:24:29 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Dec 2006 04:30:51 GMT",
"version": "v2"
},
{
"created": "Tue, 29 May 2007 19:26:07 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Keidl",
"Tobias S.",
""
],
[
"Friedman",
"John L.",
""
],
[
"Wiseman",
"Alan G.",
""
]
] | Gravitational waves from the inspiral of a stellar-size black hole to a supermassive black hole can be accurately approximated by a point particle moving in a Kerr background. This paper presents progress on finding the electromagnetic and gravitational field of a point particle in a black-hole spacetime and on computi... |
2012.04232 | Vladimir Dergachev Ph.D. | Vladimir Dergachev and Maria Alessandra Papa | Results from high-frequency all-sky search for continuous gravitational
waves from small-ellipticity sources | null | Phys. Rev. D 103, 063019 (2021) | 10.1103/PhysRevD.103.063019 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the results of an all-sky search for continuous gravitational wave
signals with frequencies in the 1700-2000 Hz range from neutron stars with
ellipticity of 1e-8. The search employs the Falcon analysis pipeline [citation
5] on LIGO O2 public data. Our results improve by a factor greater than 5 over
[citati... | [
{
"created": "Tue, 8 Dec 2020 05:53:28 GMT",
"version": "v1"
},
{
"created": "Sat, 13 Feb 2021 17:38:04 GMT",
"version": "v2"
}
] | 2021-03-24 | [
[
"Dergachev",
"Vladimir",
""
],
[
"Papa",
"Maria Alessandra",
""
]
] | We present the results of an all-sky search for continuous gravitational wave signals with frequencies in the 1700-2000 Hz range from neutron stars with ellipticity of 1e-8. The search employs the Falcon analysis pipeline [citation 5] on LIGO O2 public data. Our results improve by a factor greater than 5 over [citation... |
gr-qc/0412120 | Theophanes Grammenos | Th. Grammenos | Energy and Momentum Distributions of the Magnetic Solution to (2+1)
Einstein-Maxwell Gravity | LaTex, 13 pages; v2 clarifying comments and references added,
Conclusions improved, to appear in Mod. Phys. Lett. A | Mod.Phys.Lett. A20 (2005) 1741-1751 | 10.1142/S0217732305016956 | null | gr-qc | null | We use Moeller's energy-momentum complex in order to explicitly evaluate the
energy and momentum density distributions associated with the three-dimensional
magnetic solution to the Einstein-Maxwell equations. The magnetic spacetime
under consideration is a one-parametric solution describing the distribution of
a rad... | [
{
"created": "Sun, 26 Dec 2004 17:17:15 GMT",
"version": "v1"
},
{
"created": "Sat, 5 Mar 2005 15:02:24 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Grammenos",
"Th.",
""
]
] | We use Moeller's energy-momentum complex in order to explicitly evaluate the energy and momentum density distributions associated with the three-dimensional magnetic solution to the Einstein-Maxwell equations. The magnetic spacetime under consideration is a one-parametric solution describing the distribution of a radia... |
1302.4161 | Sanjay Jhingan | Tomohiro Harada and Sanjay Jhingan | Renormalization group approach to Einstein-Rosen waves | 15 pages, 1 eps figure, revised version to appear in Physical Review
D | null | 10.1103/PhysRevD.87.064043 | RUP-13-2 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a renormalization group analysis to Einstein-Rosen waves or vacuum
spacetimes with whole-cylinder symmetry. It is found that self-similar
solutions appear as fixed points in the renormalization group transformation.
These solutions correspond to the explosive gravitational waves and the
collapsing gravitat... | [
{
"created": "Mon, 18 Feb 2013 05:30:43 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Mar 2013 10:19:31 GMT",
"version": "v2"
}
] | 2013-04-03 | [
[
"Harada",
"Tomohiro",
""
],
[
"Jhingan",
"Sanjay",
""
]
] | We present a renormalization group analysis to Einstein-Rosen waves or vacuum spacetimes with whole-cylinder symmetry. It is found that self-similar solutions appear as fixed points in the renormalization group transformation. These solutions correspond to the explosive gravitational waves and the collapsing gravitatio... |
2108.13170 | Yu-Peng Zhang | Yu-Peng Zhang, Yan-Bo Zeng, Yong-Qiang Wang, Shao-Wen Wei, Pau Amaro
Seoane, Yu-Xiao Liu | Gravitational radiation pulses from Extreme-Mass-Ratio-Inspiral system
with a supermassive boson star | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Future space-borne gravitational-wave detectors will observe the
gravitational waves in the milli-Hz. Extreme-mass-ratio inspirals with central
supermassive black holes are very important sources that could provide the
information of the vicinity of black holes. The event horizon separates the
inner region of a black... | [
{
"created": "Mon, 30 Aug 2021 12:34:12 GMT",
"version": "v1"
}
] | 2021-08-31 | [
[
"Zhang",
"Yu-Peng",
""
],
[
"Zeng",
"Yan-Bo",
""
],
[
"Wang",
"Yong-Qiang",
""
],
[
"Wei",
"Shao-Wen",
""
],
[
"Seoane",
"Pau Amaro",
""
],
[
"Liu",
"Yu-Xiao",
""
]
] | Future space-borne gravitational-wave detectors will observe the gravitational waves in the milli-Hz. Extreme-mass-ratio inspirals with central supermassive black holes are very important sources that could provide the information of the vicinity of black holes. The event horizon separates the inner region of a black h... |
gr-qc/0411060 | Hamilton | Andrew J. S. Hamilton and Jason P. Lisle (JILA, U. Colorado) | The river model of black holes | 16 pages, 4 figures. The introduction now refers to the paper of
Unruh (1981) and the extensive work on analog black holes that it spawned.
Thanks to many readers for feedback that called attention to our omissions.
Submitted to the American Journal of Physics | Am.J.Phys.76:519-532,2008 | 10.1119/1.2830526 | null | gr-qc astro-ph | null | This paper presents an under-appreciated way to conceptualize stationary
black holes, which we call the river model. The river model is mathematically
sound, yet simple enough that the basic picture can be understood by
non-experts. %that can by understood by non-experts. In the river model, space
itself flows like a... | [
{
"created": "Fri, 12 Nov 2004 03:46:04 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Aug 2006 19:29:11 GMT",
"version": "v2"
}
] | 2010-05-12 | [
[
"Hamilton",
"Andrew J. S.",
"",
"JILA, U. Colorado"
],
[
"Lisle",
"Jason P.",
"",
"JILA, U. Colorado"
]
] | This paper presents an under-appreciated way to conceptualize stationary black holes, which we call the river model. The river model is mathematically sound, yet simple enough that the basic picture can be understood by non-experts. %that can by understood by non-experts. In the river model, space itself flows like a r... |
gr-qc/9506004 | Anzhong Wang | Anzhong Wang and Patricio S. Letelier | Bubbles and Wormholes: Analytic Models | null | null | null | null | gr-qc | null | The first junction conditions of spherically symmetric bubbles are solved for
some cases, and whereby analytic models to the Einstein field equations are
constructed. The effects of bubbles on the spacetime structure are studied and
it is found that in some cases bubbles can close the spatial sector of the
spacetime ... | [
{
"created": "Wed, 31 May 1995 12:43:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wang",
"Anzhong",
""
],
[
"Letelier",
"Patricio S.",
""
]
] | The first junction conditions of spherically symmetric bubbles are solved for some cases, and whereby analytic models to the Einstein field equations are constructed. The effects of bubbles on the spacetime structure are studied and it is found that in some cases bubbles can close the spatial sector of the spacetime an... |
2304.01069 | Sebastian Ulbricht | Sebastian Ulbricht, Johannes Dickmann, Andrey Surzhykov | Using gravitational light deflection in optical cavities for laser
frequency stabilization | 9 pages, 4 figures, 1 table | null | null | null | gr-qc physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We theoretically investigate the propagation of light in the presence of a
homogeneous gravitational field. To model this, we derive the solutions of the
wave equation in Rindler spacetime, which account for gravitational redshift
and light deflection. The developed theoretical framework is used to explore
the propag... | [
{
"created": "Mon, 3 Apr 2023 15:27:44 GMT",
"version": "v1"
}
] | 2023-04-04 | [
[
"Ulbricht",
"Sebastian",
""
],
[
"Dickmann",
"Johannes",
""
],
[
"Surzhykov",
"Andrey",
""
]
] | We theoretically investigate the propagation of light in the presence of a homogeneous gravitational field. To model this, we derive the solutions of the wave equation in Rindler spacetime, which account for gravitational redshift and light deflection. The developed theoretical framework is used to explore the propagat... |
gr-qc/9703030 | essor Petr Hajicek | P. Hajicek | Group-Theoretical Quantization of 2+1 Geavity in the Metric-Torus Sector | The first two sections completely reworked to make the paper clearer
and more self-contained. Some misprints corrected, and some insights added in
the main body | J.Math.Phys. 39 (1998) 4824-4848 | 10.1063/1.532542 | null | gr-qc | null | A symmetry based quantization method of reparametrization invariant systems
is described; it will work for all systems that possess complete sets of
perennials whose Lie algebras close and which generate a sufficiently large
symmetry groups. The construction leads to a quantum theory including a Hilbert
space, a comp... | [
{
"created": "Tue, 11 Mar 1997 21:37:54 GMT",
"version": "v1"
},
{
"created": "Thu, 29 May 1997 11:31:53 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Hajicek",
"P.",
""
]
] | A symmetry based quantization method of reparametrization invariant systems is described; it will work for all systems that possess complete sets of perennials whose Lie algebras close and which generate a sufficiently large symmetry groups. The construction leads to a quantum theory including a Hilbert space, a comple... |
1007.2854 | Muhammad Sharif | M. Sharif and Noureen Mukhtar | Plasma Wave Properties of the Schwarzschild Magnetosphere in a Veselago
Medium | 20 pages, 15 figures, accepted for publication in Astrophys. Space
Sci | Astrophys. Space Sci.331:151-162, 2011 | 10.1007/s10509-010-0430-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We re-formulate the 3+1 GRMHD equations for the Schwarzschild black hole in a
Veselago medium. Linear perturbation in rotating (non-magnetized and
magnetized) plasma is introduced and their Fourier analysis is considered. We
discuss wave properties with the help of wave vector, refractive index and
change in refracti... | [
{
"created": "Fri, 18 Jun 2010 02:40:14 GMT",
"version": "v1"
}
] | 2011-01-17 | [
[
"Sharif",
"M.",
""
],
[
"Mukhtar",
"Noureen",
""
]
] | We re-formulate the 3+1 GRMHD equations for the Schwarzschild black hole in a Veselago medium. Linear perturbation in rotating (non-magnetized and magnetized) plasma is introduced and their Fourier analysis is considered. We discuss wave properties with the help of wave vector, refractive index and change in refractive... |
1911.06148 | Yong Cai | Hao-Hao Li, Gen Ye, Yong Cai, Yun-Song Piao | Trans-Planckian censorship of multistage inflation and dark energy | 13 pages, 4 figures; references added; updated to match published
version | Phys. Rev. D 101, 063527 (2020) | 10.1103/PhysRevD.101.063527 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the bound of the trans-Planckian censorship conjecture on an
inflation model with multiple stages. We show that if the first inflationary
stage is responsible for the primordial perturbations in the cosmic microwave
background window, the $e$-folding number of each subsequent stage will be
bounded by the e... | [
{
"created": "Thu, 14 Nov 2019 14:53:07 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Mar 2020 15:01:37 GMT",
"version": "v2"
}
] | 2020-03-30 | [
[
"Li",
"Hao-Hao",
""
],
[
"Ye",
"Gen",
""
],
[
"Cai",
"Yong",
""
],
[
"Piao",
"Yun-Song",
""
]
] | We explore the bound of the trans-Planckian censorship conjecture on an inflation model with multiple stages. We show that if the first inflationary stage is responsible for the primordial perturbations in the cosmic microwave background window, the $e$-folding number of each subsequent stage will be bounded by the ene... |
1001.4034 | Martin Richarte MR | Mart\'in G. Richarte | Wormholes respecting energy conditions and solitonic shells in DGP
gravity | 7 pages, 5 figures.Minor change. Conclusions do not change at all.
One reference added. | Phys. Rev. D 82, 044021 (2010) | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We build spherically symmetric wormholes within the DGP theory. We calculate
the energy localized on the shell, and we find that for certain values of the
parameters wormholes could be supported by matter not violating the energy
conditions. We also show that it could exist solitonic shells charaterized by
zero press... | [
{
"created": "Fri, 22 Jan 2010 16:03:28 GMT",
"version": "v1"
},
{
"created": "Sun, 14 Mar 2010 21:48:16 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Richarte",
"Martín G.",
""
]
] | We build spherically symmetric wormholes within the DGP theory. We calculate the energy localized on the shell, and we find that for certain values of the parameters wormholes could be supported by matter not violating the energy conditions. We also show that it could exist solitonic shells charaterized by zero pressur... |
gr-qc/0608055 | Peter K.F. Kuhfittig | Peter K.F. Kuhfittig | Seeking exactly solvable models of traversable wormholes supported by
phantom energy | 10 pages AMSTeX | Class.Quant.Grav. 23 (2006) 5853-5860 | 10.1088/0264-9381/23/20/007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The purpose of this paper is to obtain exact solutions of the Einstein field
equations describing traversable wormholes supported by phantom energy. Their
relationship to exact solutions in the literature is also discussed, as well as
the conditions required to determine such solutions.
| [
{
"created": "Thu, 10 Aug 2006 15:17:01 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Oct 2006 19:03:57 GMT",
"version": "v2"
},
{
"created": "Mon, 2 Mar 2015 16:52:04 GMT",
"version": "v3"
},
{
"created": "Fri, 3 Apr 2015 14:52:54 GMT",
"version": "v4"
}
] | 2015-04-06 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | The purpose of this paper is to obtain exact solutions of the Einstein field equations describing traversable wormholes supported by phantom energy. Their relationship to exact solutions in the literature is also discussed, as well as the conditions required to determine such solutions. |
gr-qc/0606078 | Ghanashyam Date | Ghanashyam Date | On obtaining classical mechanics from quantum mechanics | revtex4, 24 pages, no figures. In the version 2 certain technical
errors in section I-B are corrected, the part on WKB (and section II-B) is
removed, discussion of dynamics and semiclassicality is extended and
references are added. Accepted for publication on Classical and Quantum
Gravity | Class.Quant.Grav.24:535-550,2007 | 10.1088/0264-9381/24/3/002 | IMSc/2006/6/17 | gr-qc hep-th math-ph math.MP quant-ph | null | Constructing a classical mechanical system associated with a given quantum
mechanical one, entails construction of a classical phase space and a
corresponding Hamiltonian function from the available quantum structures and a
notion of coarser observations. The Hilbert space of any quantum mechanical
system naturally h... | [
{
"created": "Sun, 18 Jun 2006 06:19:36 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Dec 2006 08:49:29 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Date",
"Ghanashyam",
""
]
] | Constructing a classical mechanical system associated with a given quantum mechanical one, entails construction of a classical phase space and a corresponding Hamiltonian function from the available quantum structures and a notion of coarser observations. The Hilbert space of any quantum mechanical system naturally has... |
1107.0345 | Jose Edgar Madriz Aguilar | Luz M. Reyes, Jos\'e Edgar Madriz Aguilar, L Arturo Ure\~na-L\'opez | Cosmological dark fluid from five-dimensional vacuum | 5 pages, under review in Physical Review D | Phys.Rev.D84:027503,2011 | 10.1103/PhysRevD.84.027503 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of the induced matter theory of gravity, we derive a 5D
solution of the field equations that can describe a 4D cosmological scenario
where the dark fluid (dark matter plus dark energy) equation of state has a
geometrical origin. There is no a natural separation of the dark sector into
different compo... | [
{
"created": "Fri, 1 Jul 2011 23:00:08 GMT",
"version": "v1"
}
] | 2011-08-11 | [
[
"Reyes",
"Luz M.",
""
],
[
"Aguilar",
"José Edgar Madriz",
""
],
[
"Ureña-López",
"L Arturo",
""
]
] | In the framework of the induced matter theory of gravity, we derive a 5D solution of the field equations that can describe a 4D cosmological scenario where the dark fluid (dark matter plus dark energy) equation of state has a geometrical origin. There is no a natural separation of the dark sector into different compone... |
2311.02053 | Rikpratik Sengupta | Rikpratik Sengupta | A novel model of non-singular oscillating cosmology on flat
Randall-Sundrum II braneworld | 11 pages, 3 Figures | General Relativity and Gravitation 56(4):42 2024 | 10.1007/s10714-024-03233-9 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We obtain a \textit{novel} model of oscillating non-singular cosmology on the
spatially flat Randall-Sundrum (RS) II brane. At early times, the universe is
dominated by a scalar field with an inflationary emergent potential
$V(\phi)=A(e^{B\phi}-1)^2$, $A$ and $B$ being constants. Interestingly, we find
that such a sc... | [
{
"created": "Fri, 3 Nov 2023 17:32:43 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Nov 2023 00:21:59 GMT",
"version": "v2"
}
] | 2024-04-09 | [
[
"Sengupta",
"Rikpratik",
""
]
] | We obtain a \textit{novel} model of oscillating non-singular cosmology on the spatially flat Randall-Sundrum (RS) II brane. At early times, the universe is dominated by a scalar field with an inflationary emergent potential $V(\phi)=A(e^{B\phi}-1)^2$, $A$ and $B$ being constants. Interestingly, we find that such a scal... |
2209.03802 | Mathias Braun | Mathias Braun, Matteo Calisti | Timelike Ricci bounds for low regularity spacetimes by optimal transport | 23 pages. Final version | null | null | null | gr-qc math-ph math.DG math.MP math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove that a globally hyperbolic smooth spacetime endowed with a
$\smash{\mathrm{C}^1}$-Lorentzian metric whose Ricci tensor is bounded from
below in all timelike directions, in a distributional sense, obeys the timelike
measure-contraction property. This result includes a class of spacetimes with
borderline regul... | [
{
"created": "Thu, 8 Sep 2022 13:21:42 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Oct 2022 17:36:51 GMT",
"version": "v2"
},
{
"created": "Sat, 7 Oct 2023 03:28:42 GMT",
"version": "v3"
}
] | 2023-10-10 | [
[
"Braun",
"Mathias",
""
],
[
"Calisti",
"Matteo",
""
]
] | We prove that a globally hyperbolic smooth spacetime endowed with a $\smash{\mathrm{C}^1}$-Lorentzian metric whose Ricci tensor is bounded from below in all timelike directions, in a distributional sense, obeys the timelike measure-contraction property. This result includes a class of spacetimes with borderline regular... |
gr-qc/9907049 | Jiri Podolsky | J. Bicak, J. Podolsky | Gravitational waves in vacuum spacetimes with cosmological constant. II.
Deviation of geodesics and interpretation of non-twisting type N solutions | 16 pages, no figures, LaTeX, To appear in J. Math. Phys | J.Math.Phys. 40 (1999) 4506-4517 | 10.1063/1.532982 | null | gr-qc | null | In a suitably chosen essentially unique frame tied to a given observer in a
general spacetime, the equation of geodesic deviation can be decomposed into a
sum of terms describing specific effects: isotropic (background) motions
associated with the cosmological constant, transverse motions corresponding to
the effects... | [
{
"created": "Tue, 13 Jul 1999 15:19:07 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Bicak",
"J.",
""
],
[
"Podolsky",
"J.",
""
]
] | In a suitably chosen essentially unique frame tied to a given observer in a general spacetime, the equation of geodesic deviation can be decomposed into a sum of terms describing specific effects: isotropic (background) motions associated with the cosmological constant, transverse motions corresponding to the effects o... |
gr-qc/9608060 | Harald Soleng | Bj{\o}rn Jensen (University of Oslo) and Harald H. Soleng (CERN) | Anisotropic domain walls | 11 pages, LaTeX, 3 PostScript figures, uses amstex and epsfig | Class.Quant.Grav. 14 (1997) 1821-1829 | 10.1088/0264-9381/14/7/017 | CERN-TH/96-92 | gr-qc | null | We find an anisotropic, non-supersymmetric generalization of the extreme
supersymmetric domain walls of simple non-dilatonic supergravity theory. As
opposed to the isotropic non- and ultra-extreme domain walls, the anisotropic
non-extreme wall has the \emph{same} spatial topology as the extreme wall. The
solution has... | [
{
"created": "Mon, 26 Aug 1996 11:09:25 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Jensen",
"Bjørn",
"",
"University of Oslo"
],
[
"Soleng",
"Harald H.",
"",
"CERN"
]
] | We find an anisotropic, non-supersymmetric generalization of the extreme supersymmetric domain walls of simple non-dilatonic supergravity theory. As opposed to the isotropic non- and ultra-extreme domain walls, the anisotropic non-extreme wall has the \emph{same} spatial topology as the extreme wall. The solution has n... |
1203.6525 | Norbert Bodendorfer | Norbert Bodendorfer, Alexander Stottmeister, Andreas Thurn | Loop quantum gravity without the Hamiltonian constraint | 8 pages. v2: Journal version. Black hole state counting based on
physical states added. Applications to loop quantum cosmology discussed.
Gauge condition used shown to coincide with CMC gauge. Minor clarifications.
v3: Erroneous topology dependence of the entropy in journal version
corrected, conclusions fixed ... | Class. Quantum Grav. 30 (2013) 082001 | 10.1088/0264-9381/30/8/082001 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that under certain technical assumptions, including the existence of
a constant mean curvature (CMC) slice and strict positivity of the scalar
field, general relativity conformally coupled to a scalar field can be
quantised on a partially reduced phase space, meaning reduced only with respect
to the Hamiltoni... | [
{
"created": "Thu, 29 Mar 2012 14:08:13 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Feb 2013 18:44:29 GMT",
"version": "v2"
},
{
"created": "Wed, 24 Apr 2013 16:56:17 GMT",
"version": "v3"
}
] | 2013-04-25 | [
[
"Bodendorfer",
"Norbert",
""
],
[
"Stottmeister",
"Alexander",
""
],
[
"Thurn",
"Andreas",
""
]
] | We show that under certain technical assumptions, including the existence of a constant mean curvature (CMC) slice and strict positivity of the scalar field, general relativity conformally coupled to a scalar field can be quantised on a partially reduced phase space, meaning reduced only with respect to the Hamiltonian... |
2110.09960 | Jianhui Qiu | Jianhui Qiu, Changjun Gao | Extending Bekenstein's theorem in order to search exact solutions of
Einstein-Maxwell-conformal-scalar equations | null | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Bekenstein's theorem allows us to generate a Einstein-conformal scalar
solution from a single Einstein-ordinary scalar solution. In this article, we
extend this theorem to Einstein-Maxwell-scalar (EMS) theory with a non-minimal
coupling between the scalar and Maxwell field. As applications of this extended
theore... | [
{
"created": "Tue, 19 Oct 2021 13:21:07 GMT",
"version": "v1"
}
] | 2021-10-20 | [
[
"Qiu",
"Jianhui",
""
],
[
"Gao",
"Changjun",
""
]
] | The Bekenstein's theorem allows us to generate a Einstein-conformal scalar solution from a single Einstein-ordinary scalar solution. In this article, we extend this theorem to Einstein-Maxwell-scalar (EMS) theory with a non-minimal coupling between the scalar and Maxwell field. As applications of this extended theorem,... |
gr-qc/9606011 | Max welling | M. Welling | The Torus Universe in the Polygon Approach to 2+1-Dimensional Gravity | 18 pages Latex, 13 eps-figures | Class.Quant.Grav. 14 (1997) 929-943 | 10.1088/0264-9381/14/4/010 | THU-96/22 | gr-qc | null | In this paper we describe the matter-free toroidal spacetime in 't Hooft's
polygon approach to 2+1-dimensional gravity (i.e. we consider the case without
any particles present). Contrary to earlier results in the literature we find
that it is not possible to describe the torus by just one polygon but we need
at least... | [
{
"created": "Thu, 6 Jun 1996 15:45:41 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Welling",
"M.",
""
]
] | In this paper we describe the matter-free toroidal spacetime in 't Hooft's polygon approach to 2+1-dimensional gravity (i.e. we consider the case without any particles present). Contrary to earlier results in the literature we find that it is not possible to describe the torus by just one polygon but we need at least t... |
1601.06546 | Yu-Xiao Liu | Qi-Ming Fu, Li Zhao, Yu-Xiao Liu | Hybrid metric-Palatini brane system | 7 pages, 4 figures | Phys. Rev. D 94, 024020 (2016) | 10.1103/PhysRevD.94.024020 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is known that the metric and Palatini formalisms of gravity theories have
their own interesting features but also suffer from some different drawbacks.
Recently, a novel gravity theory called hybrid metric-Palatini gravity was put
forward to cure or improve their individual deficiencies. The action of this
gravity... | [
{
"created": "Mon, 25 Jan 2016 10:24:32 GMT",
"version": "v1"
}
] | 2016-07-13 | [
[
"Fu",
"Qi-Ming",
""
],
[
"Zhao",
"Li",
""
],
[
"Liu",
"Yu-Xiao",
""
]
] | It is known that the metric and Palatini formalisms of gravity theories have their own interesting features but also suffer from some different drawbacks. Recently, a novel gravity theory called hybrid metric-Palatini gravity was put forward to cure or improve their individual deficiencies. The action of this gravity t... |
gr-qc/0307065 | Norbert Noutchegueme | Norbert Noutchegueme and Mesmin Erick Tetsadjio | Global solutions for the relativistic Boltzmann equation in the
homogeneous case on the Minkowski space-time | 19 pages | null | null | null | gr-qc | null | We prove, for the relativistic Boltzmann equation in the homogeneous case, on
the Minkowski space-time, a global in time existence and uniqueness theorem.
The method we develop extends to the cases of some curved space-times such as
the flat Robertson-Walker space-time and some Bianchi type I space-times.
| [
{
"created": "Mon, 14 Jul 2003 13:03:13 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Noutchegueme",
"Norbert",
""
],
[
"Tetsadjio",
"Mesmin Erick",
""
]
] | We prove, for the relativistic Boltzmann equation in the homogeneous case, on the Minkowski space-time, a global in time existence and uniqueness theorem. The method we develop extends to the cases of some curved space-times such as the flat Robertson-Walker space-time and some Bianchi type I space-times. |
1907.13108 | Tao Zhu | Guang-Hua Ding, Jin Qiao, Qiang Wu, Tao Zhu, and Anzhong Wang | Inflationary perturbation spectra at next-to-leading slow-roll order in
effective field theory of inflation | 11 pages. arXiv admin note: text overlap with arXiv:1811.03216,
arXiv:1707.08020; version published in Eur. Phys. J. C | Eur. Phys. J. C 79, 976 (2019) | 10.1140/epjc/s10052-019-7496-7 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The effective field theory (EFT) of inflation provides an essential picture
to explore the effects of the unknown high energy physics in the single scalar
field inflation models. For a generic EFT of inflation, possible high energy
corrections to simple slow-roll inflation can modify both the propagating speed
and di... | [
{
"created": "Mon, 29 Jul 2019 01:28:30 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Nov 2019 05:40:50 GMT",
"version": "v2"
}
] | 2019-12-03 | [
[
"Ding",
"Guang-Hua",
""
],
[
"Qiao",
"Jin",
""
],
[
"Wu",
"Qiang",
""
],
[
"Zhu",
"Tao",
""
],
[
"Wang",
"Anzhong",
""
]
] | The effective field theory (EFT) of inflation provides an essential picture to explore the effects of the unknown high energy physics in the single scalar field inflation models. For a generic EFT of inflation, possible high energy corrections to simple slow-roll inflation can modify both the propagating speed and disp... |
0902.3808 | Janos Polonyi | J. Polonyi, A. Radosz, A. Siwek, and K. Ostasiewicz | Turning points of massive particles in Schwarzschild geometry | 2 pages, 1 figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The stable geodesics in Schwarzschild geometry can not approach the center
closer than the radius of the photon sphere, 3/2 times the Schwarzschild
radius. In other words, massive particles moving along geodesics that cross the
photon sphere do not escape, they fall into the black hole.
| [
{
"created": "Sun, 22 Feb 2009 17:55:59 GMT",
"version": "v1"
}
] | 2009-02-24 | [
[
"Polonyi",
"J.",
""
],
[
"Radosz",
"A.",
""
],
[
"Siwek",
"A.",
""
],
[
"Ostasiewicz",
"K.",
""
]
] | The stable geodesics in Schwarzschild geometry can not approach the center closer than the radius of the photon sphere, 3/2 times the Schwarzschild radius. In other words, massive particles moving along geodesics that cross the photon sphere do not escape, they fall into the black hole. |
gr-qc/0703014 | Joachim Schr\"oter | Joachim Schr\"oter | A New Formulation of General Relativity - Part II: Pre-Radar Charts and
Generating Functions in Arbitrary Space-Times | 24 pages | null | null | null | gr-qc | null | In this paper (Part II), the so-called inverse problem is treated. This means
the question whether it is possible to define pre-radar charts, i.e. generating
functions in arbitrary space-times. This problem is subtle. A local general
constructive solution of it is presented. Sufficient conditions for the
existence of... | [
{
"created": "Fri, 2 Mar 2007 15:00:41 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Schröter",
"Joachim",
""
]
] | In this paper (Part II), the so-called inverse problem is treated. This means the question whether it is possible to define pre-radar charts, i.e. generating functions in arbitrary space-times. This problem is subtle. A local general constructive solution of it is presented. Sufficient conditions for the existence of g... |
2308.07365 | Carlos O. Lousto | A. Ciarfella, G. Ficarra, C.O. Lousto (CCRG-RIT) | Close Encounter of Three Black Holes Revisited | 13 pages, 12 figures, 6 tables | null | null | null | gr-qc astro-ph.CO astro-ph.GA astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the evolution of close triple black hole system with full numerical
relativity techniques. We consider an equal mass non spinning hierarchical
system with an inner binary ten orbits away from merger and study the effects
of the third outer black hole on the binary's merger time and its eccentricity
evolution... | [
{
"created": "Mon, 14 Aug 2023 18:00:00 GMT",
"version": "v1"
}
] | 2023-08-16 | [
[
"Ciarfella",
"A.",
"",
"CCRG-RIT"
],
[
"Ficarra",
"G.",
"",
"CCRG-RIT"
],
[
"Lousto",
"C. O.",
"",
"CCRG-RIT"
]
] | We study the evolution of close triple black hole system with full numerical relativity techniques. We consider an equal mass non spinning hierarchical system with an inner binary ten orbits away from merger and study the effects of the third outer black hole on the binary's merger time and its eccentricity evolution. ... |
1501.00487 | Shahram Jalalzadeh | S. Najafi, T. Rostami and S. Jalalzadeh | Five dimensional cosmological traversable wormhole | 11 pages, 1 figure, to appear in Annals of Physics | null | 10.1016/j.aop.2014.12.028 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, a traversable wormhole in the
Friedmann-Lema\^{\i}tre-Robertson-Walker (FLRW) model with one extra spacelike
compact dimension is studied. We have chosen dynamical compactification as the
evolution of the fifth dimension. In this respect, we study how the existence
of the extra dimension, affect the be... | [
{
"created": "Wed, 31 Dec 2014 19:46:03 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Najafi",
"S.",
""
],
[
"Rostami",
"T.",
""
],
[
"Jalalzadeh",
"S.",
""
]
] | In this paper, a traversable wormhole in the Friedmann-Lema\^{\i}tre-Robertson-Walker (FLRW) model with one extra spacelike compact dimension is studied. We have chosen dynamical compactification as the evolution of the fifth dimension. In this respect, we study how the existence of the extra dimension, affect the beha... |
1510.02608 | Ernst Pashitskii | E.A. Pashitskii, V.I. Pentegov | "Big Bang'' as a result of first-order phase transition driven by
changing scalar curvature in expanding early Universe: "hyperinflation''
scenario | 10 pages, 6 figures; to be published in JETP V.149, No.1 (2016) | null | 10.1134/S1063776116010076 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We suggest that the "Big Bang" may be a result of the first-order phase
transition driven by changing scalar curvature of the 4D space-time in
expanding cold Universe, filled with nonlinear scalar field $\phi $ and neutral
matter with equation of state $p=\nu \varepsilon $ (where $p$ and $\varepsilon
$ are pressure a... | [
{
"created": "Fri, 9 Oct 2015 09:54:08 GMT",
"version": "v1"
}
] | 2016-05-04 | [
[
"Pashitskii",
"E. A.",
""
],
[
"Pentegov",
"V. I.",
""
]
] | We suggest that the "Big Bang" may be a result of the first-order phase transition driven by changing scalar curvature of the 4D space-time in expanding cold Universe, filled with nonlinear scalar field $\phi $ and neutral matter with equation of state $p=\nu \varepsilon $ (where $p$ and $\varepsilon $ are pressure and... |
2402.02471 | Sanjar Shaymatov | Sanjar Shaymatov | Efficiency of magnetic Penrose process in higher dimensional Myers-Perry
black hole spacetimes | 13 pages, one table, 2 captioned figures. Accepted for publication in
Phys. Rev. D | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we consider a well-established magnetic Penrose process (MPP)
and bring out its impact on the efficiency of energy extraction from higher
dimensional (i.e., $D>4$) black holes. We derive the field equations of motion
and determine the expressions for the energy efficiency of energy extraction
for the c... | [
{
"created": "Sun, 4 Feb 2024 13:04:10 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jul 2024 13:51:48 GMT",
"version": "v2"
}
] | 2024-07-19 | [
[
"Shaymatov",
"Sanjar",
""
]
] | In this paper, we consider a well-established magnetic Penrose process (MPP) and bring out its impact on the efficiency of energy extraction from higher dimensional (i.e., $D>4$) black holes. We derive the field equations of motion and determine the expressions for the energy efficiency of energy extraction for the cas... |
gr-qc/9309007 | null | Boro Grubisic and Vincent Moncrief | The Mixmaster Spacetime, Geroch's Transformation and Constants of Motion | 25 pages, preprint YCTP-20-93, Revtex | Phys.Rev. D49 (1994) 2792-2800 | 10.1103/PhysRevD.49.2792 | null | gr-qc | null | We show that for $U(1)$-symmetric spacetimes on $S^3 \times R$ a constant of
motion associated with the well known Geroch transformation, a functional
$K[h_{ij},\pi^{ij}]$, quadratic in gravitational momenta, is strictly positive
in an open subset of the set of all $U(1)$-symmetric initial data, and
therefore not wea... | [
{
"created": "Thu, 9 Sep 1993 23:42:00 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Grubisic",
"Boro",
""
],
[
"Moncrief",
"Vincent",
""
]
] | We show that for $U(1)$-symmetric spacetimes on $S^3 \times R$ a constant of motion associated with the well known Geroch transformation, a functional $K[h_{ij},\pi^{ij}]$, quadratic in gravitational momenta, is strictly positive in an open subset of the set of all $U(1)$-symmetric initial data, and therefore not weakl... |
1205.1217 | Md. Rahman Atiqur | M. Atiqur Rahman | Transverse Wave Propagation in Relativistic Two-fluid Plasmas around
Schwarzschild-anti-de Sitter Black Hole | 11 pages. arXiv admin note: substantial text overlap with
arXiv:1008.4838, arXiv:0807.4595, arXiv:0902.3766, arXiv:0806.2740,
arXiv:0904.3377 | International Journal of Modern Physics D 22 (2013) 1350036 | 10.1142/S0218271813500363 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The 3+1 formalism of Thorne and Macdonald has been used to derive the linear
two-fluid equations for transverse waves in the plasma closed to the
Schwarzschild-anti-de Sitter (SAdS) black hole. We reformulate the relativistic
two-fluid equations to take account of gravitational effects due to the event
horizon and ne... | [
{
"created": "Sun, 6 May 2012 13:39:23 GMT",
"version": "v1"
}
] | 2013-05-28 | [
[
"Rahman",
"M. Atiqur",
""
]
] | The 3+1 formalism of Thorne and Macdonald has been used to derive the linear two-fluid equations for transverse waves in the plasma closed to the Schwarzschild-anti-de Sitter (SAdS) black hole. We reformulate the relativistic two-fluid equations to take account of gravitational effects due to the event horizon and nega... |
1502.01343 | Simone Balmelli | Simone Balmelli and Philippe Jetzer | Effective-one-body Hamiltonian with next-to-leading order spin-spin
coupling | 12 pages, 1 figure. Submitted to Phys. Rev. D | null | 10.1103/PhysRevD.91.064011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a way of including the next-to-leading (NLO) order spin-spin
coupling into an effective-one-body (EOB) Hamiltonian. This work extends [S.
Balmelli and P. Jetzer, Phys. Rev. D 87, 124036 (2013)], which is restricted to
the case of equatorial orbits and aligned spins, to general orbits with
arbitrary spin or... | [
{
"created": "Wed, 4 Feb 2015 21:00:10 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Balmelli",
"Simone",
""
],
[
"Jetzer",
"Philippe",
""
]
] | We propose a way of including the next-to-leading (NLO) order spin-spin coupling into an effective-one-body (EOB) Hamiltonian. This work extends [S. Balmelli and P. Jetzer, Phys. Rev. D 87, 124036 (2013)], which is restricted to the case of equatorial orbits and aligned spins, to general orbits with arbitrary spin orie... |
1604.06402 | Christos Charmousis | Eugeny Babichev, Christos Charmousis and Antoine Leh\'ebel | Black holes and stars in Horndeski theory | 28 pages, 1 figure, some references added and minor corrections;
published version | Class.Quant.Grav. 33 (2016) no.15, 154002 | 10.1088/0264-9381/33/15/154002 | LPT-Orsay-16-35 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review black hole and star solutions for Horndeski theory. For non-shift
symmetric theories, black holes involve a Kaluza-Klein reduction of higher
dimensional Lovelock solutions. On the other hand, for shift symmetric theories
of Horndeski and beyond Horndeski, black holes involve two classes of
solutions: those ... | [
{
"created": "Thu, 21 Apr 2016 17:58:28 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Jul 2016 07:30:20 GMT",
"version": "v2"
}
] | 2016-09-07 | [
[
"Babichev",
"Eugeny",
""
],
[
"Charmousis",
"Christos",
""
],
[
"Lehébel",
"Antoine",
""
]
] | We review black hole and star solutions for Horndeski theory. For non-shift symmetric theories, black holes involve a Kaluza-Klein reduction of higher dimensional Lovelock solutions. On the other hand, for shift symmetric theories of Horndeski and beyond Horndeski, black holes involve two classes of solutions: those th... |
1510.02272 | Vakif K Onemli | V.K. Onemli | Quantum corrected power spectra of massless minimally coupled scalars
during inflation: Effects of Yukawa coupling versus quartic self-interaction | 37 pages | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We, in the first part, contemplate a massless minimally coupled scalar which
is Yukawa-coupled to a massless Dirac fermion in a locally de Sitter background
of an inflating spacetime. We compute the scalar's quantum corrected mode
function, power spectrum, spectral index and the running of the spectral index
at one-l... | [
{
"created": "Thu, 8 Oct 2015 10:25:31 GMT",
"version": "v1"
}
] | 2015-10-09 | [
[
"Onemli",
"V. K.",
""
]
] | We, in the first part, contemplate a massless minimally coupled scalar which is Yukawa-coupled to a massless Dirac fermion in a locally de Sitter background of an inflating spacetime. We compute the scalar's quantum corrected mode function, power spectrum, spectral index and the running of the spectral index at one-loo... |
2008.07750 | Dah-Wei Chiou | Bo-Hung Chen, Dah-Wei Chiou | A unified view of curvature and torsion in metric-affine gauge theory of
gravity through affine-vector bundles | 35 pages, 2 figures; contains quotes from Refs. [3]
(arXiv:gr-qc/9602013), [8] (arXiv:gr-qc/9402012) and [26] (MTW); v2: various
minor improvements made, version to appear in CQG | Class. Quantum Grav. 38 (2021) 155003 | 10.1088/1361-6382/ac08a5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the most appealing results of metric-affine gauge theory of gravity is
a close parallel between the Riemann curvature two-form and the Cartan torsion
two-form: While the former is the field strength of the Lorentz-group
connection one-form, the latter can be understood as the field strength of the
coframe one-... | [
{
"created": "Tue, 18 Aug 2020 05:38:42 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Jul 2021 02:10:54 GMT",
"version": "v2"
}
] | 2021-07-15 | [
[
"Chen",
"Bo-Hung",
""
],
[
"Chiou",
"Dah-Wei",
""
]
] | One of the most appealing results of metric-affine gauge theory of gravity is a close parallel between the Riemann curvature two-form and the Cartan torsion two-form: While the former is the field strength of the Lorentz-group connection one-form, the latter can be understood as the field strength of the coframe one-fo... |
2103.11817 | Khashayar Kianfar | Khashayar Kianfar | Magnetically charged stars with nonlinear electrodynamics | We have decided to withdraw this paper to implement substantial
changes that affect the core methodology and conclusions. These revisions are
necessary to ensure the accuracy and integrity of our research. The updated
paper will provide a more accurate and comprehensive analysis of the subject
matter | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this research, we introduce magnetically charged stars in the framework of
non-singular metric which is explained with nonlinear electrodynamics(NED).
This model allows us to have an upper limit for the maximum limit for the mass
of stars in the presence of NED. We explain our model for magnetized compact
object b... | [
{
"created": "Fri, 19 Mar 2021 11:15:33 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Mar 2021 02:03:41 GMT",
"version": "v2"
},
{
"created": "Sat, 31 Jul 2021 14:25:03 GMT",
"version": "v3"
},
{
"created": "Sat, 7 Aug 2021 13:14:51 GMT",
"version": "v4"
},
{
"cr... | 2024-06-10 | [
[
"Kianfar",
"Khashayar",
""
]
] | In this research, we introduce magnetically charged stars in the framework of non-singular metric which is explained with nonlinear electrodynamics(NED). This model allows us to have an upper limit for the maximum limit for the mass of stars in the presence of NED. We explain our model for magnetized compact object by ... |
1110.6564 | Vladimir S. Manko | V.S. Manko | On the physical interpretation of the delta=2 Tomimatsu-Sato solution | 13 pages, 6 figures, submitted to Prog. Theor. Phys | Prog. Theor. Phys. 127 (2012), 1057-1075 | 10.1143/PTP.127.1057 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The physical properties of the Tomimatsu-Sato delta=2 spacetime are analyzed,
with emphasis on the issues of the negative mass distribution in this spacetime
and the origin of a massless ring singularity which are treated with the aid of
an equatorially asymmetric two-body configuration arising within the framework
o... | [
{
"created": "Sat, 29 Oct 2011 22:52:20 GMT",
"version": "v1"
}
] | 2012-07-03 | [
[
"Manko",
"V. S.",
""
]
] | The physical properties of the Tomimatsu-Sato delta=2 spacetime are analyzed, with emphasis on the issues of the negative mass distribution in this spacetime and the origin of a massless ring singularity which are treated with the aid of an equatorially asymmetric two-body configuration arising within the framework of ... |
2405.08928 | Mehdi Shokri | Ram\'on Herrera, Mehdi Shokri, Jafar Sadeghi | Constant-roll inflation with a complex scalar field | 14 pages, 3 figures, to appear in Annals of Physics | null | null | null | gr-qc astro-ph.CO | http://creativecommons.org/publicdomain/zero/1.0/ | We consider inflation with a constant rate of rolling in which a complex
scalar field plays the role of inflaton during the inflationary epoch. We
implement the inflationary analysis for an accredited angular speed
$\dot{\theta}$ which satisfies our dynamical equations. Scalar and tensorial
perturbations generated in... | [
{
"created": "Tue, 14 May 2024 19:48:02 GMT",
"version": "v1"
}
] | 2024-05-16 | [
[
"Herrera",
"Ramón",
""
],
[
"Shokri",
"Mehdi",
""
],
[
"Sadeghi",
"Jafar",
""
]
] | We consider inflation with a constant rate of rolling in which a complex scalar field plays the role of inflaton during the inflationary epoch. We implement the inflationary analysis for an accredited angular speed $\dot{\theta}$ which satisfies our dynamical equations. Scalar and tensorial perturbations generated in t... |
2406.07607 | Lorenzo Speri | Lorenzo Speri, Susanna Barsanti, Andrea Maselli, Thomas P. Sotiriou,
Niels Warburton, Maarten van de Meent, Alvin J. K. Chua, Ollie Burke and
Jonathan Gair | Probing fundamental physics with Extreme Mass Ratio Inspirals: a full
Bayesian inference for scalar charge | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Extreme Mass Ratio Inspirals (EMRIs) are key sources for the future
space-based gravitational wave detector LISA, and are considered promising
probes of fundamental physics. Here, we present the first complete Bayesian
analysis of EMRI signals in theories with an additional massless scalar, which
could arise in an ex... | [
{
"created": "Tue, 11 Jun 2024 18:00:00 GMT",
"version": "v1"
}
] | 2024-06-13 | [
[
"Speri",
"Lorenzo",
""
],
[
"Barsanti",
"Susanna",
""
],
[
"Maselli",
"Andrea",
""
],
[
"Sotiriou",
"Thomas P.",
""
],
[
"Warburton",
"Niels",
""
],
[
"van de Meent",
"Maarten",
""
],
[
"Chua",
"Alvin J. K.",
... | Extreme Mass Ratio Inspirals (EMRIs) are key sources for the future space-based gravitational wave detector LISA, and are considered promising probes of fundamental physics. Here, we present the first complete Bayesian analysis of EMRI signals in theories with an additional massless scalar, which could arise in an exte... |
1804.02988 | Nick Gorkavyi | Nick Gorkavyi and Alexander Vasilkov | A modified Friedmann equation for a system with varying gravitational
mass | Published in MNRAS, 476, 1 May 2018 | null | 10.1093/mnras/sty335 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Laser Interferometer Gravitational-Wave Observatory (LIGO) detection of
gravitational waves that take away 5% of the total mass of two merging black
holes points out on the importance of considering varying gravitational mass of
a system. Using an assumption that the energy-momentum pseudo-tensor of
gravitational... | [
{
"created": "Tue, 3 Apr 2018 22:28:45 GMT",
"version": "v1"
}
] | 2018-04-10 | [
[
"Gorkavyi",
"Nick",
""
],
[
"Vasilkov",
"Alexander",
""
]
] | The Laser Interferometer Gravitational-Wave Observatory (LIGO) detection of gravitational waves that take away 5% of the total mass of two merging black holes points out on the importance of considering varying gravitational mass of a system. Using an assumption that the energy-momentum pseudo-tensor of gravitational w... |
2309.08536 | Marco de Cesare | David Brizuela, Marco de Cesare, Araceli Soler Oficial | Gravitational wave oscillations in bimetric cosmology | 30 pages, 6 figures | JCAP 03, 004 (2024) | 10.1088/1475-7516/2024/03/004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Unlike general relativity, in bimetric gravity linear gravitational waves do
not evolve as free fields. In this theory there are two types of tensor
perturbations, whose interactions are inherited from non-trivial couplings
between two dynamical metric tensor fields in the Hassan-Rosen action, and are
responsible for... | [
{
"created": "Fri, 15 Sep 2023 16:56:06 GMT",
"version": "v1"
}
] | 2024-03-11 | [
[
"Brizuela",
"David",
""
],
[
"de Cesare",
"Marco",
""
],
[
"Oficial",
"Araceli Soler",
""
]
] | Unlike general relativity, in bimetric gravity linear gravitational waves do not evolve as free fields. In this theory there are two types of tensor perturbations, whose interactions are inherited from non-trivial couplings between two dynamical metric tensor fields in the Hassan-Rosen action, and are responsible for t... |
1911.09893 | Hirotaka Yoshino | Hirotaka Yoshino, Keisuke Izumi, Tetsuya Shiromizu, Yoshimune Tomikawa | Formation of dynamically transversely trapping surfaces and the
stretched hoop conjecture | 24 pages, 15 figures, minor corrections, published version | Prog. Theor. Exp. Phys. (2020) 053E01 | 10.1093/ptep/ptaa050 | OCU-PHYS-510, AP-GR-158 | gr-qc astro-ph.GA | http://creativecommons.org/licenses/by/4.0/ | A dynamically transversely trapping surface (DTTS) is a new concept of an
extension of a photon sphere that appropriately represents a strong gravity
region and has close analogy with a trapped surface. We study formation of a
marginally DTTS in time-symmetric, conformally flat initial data with two black
holes, with... | [
{
"created": "Fri, 22 Nov 2019 07:12:56 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Jul 2020 09:01:04 GMT",
"version": "v2"
}
] | 2020-07-08 | [
[
"Yoshino",
"Hirotaka",
""
],
[
"Izumi",
"Keisuke",
""
],
[
"Shiromizu",
"Tetsuya",
""
],
[
"Tomikawa",
"Yoshimune",
""
]
] | A dynamically transversely trapping surface (DTTS) is a new concept of an extension of a photon sphere that appropriately represents a strong gravity region and has close analogy with a trapped surface. We study formation of a marginally DTTS in time-symmetric, conformally flat initial data with two black holes, with a... |
1011.5174 | Viktor Toth | Viktor T. Toth | Cosmological consequences of Modified Gravity (MOG) | 14 pages, 7 figures. Minor typos corrected. Expanded version of
invited talk given at the International Conference on Two Cosmological
Models, Universidad Iberoamericana, Ciudad de Mexico, November 17-19, 2010 | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As an alternative to the LCDM concordance model, Scalar-Tensor-Vector
Modified Gravity (MOG) theory reproduces key cosmological observations without
postulating the presence of an exotic dark matter component. MOG is a field
theory based on an action principle, with a variable gravitational constant and
a repulsive v... | [
{
"created": "Tue, 23 Nov 2010 17:34:31 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Apr 2011 21:29:48 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Toth",
"Viktor T.",
""
]
] | As an alternative to the LCDM concordance model, Scalar-Tensor-Vector Modified Gravity (MOG) theory reproduces key cosmological observations without postulating the presence of an exotic dark matter component. MOG is a field theory based on an action principle, with a variable gravitational constant and a repulsive vec... |
gr-qc/9607022 | Gerard 't Hooft | G. 't Hooft | The scattering matrix approach for the quantum black hole, an overview | Review paper, 71 pages plain TEX, 8 Figures (Postscript) | Int.J.Mod.Phys.A11:4623-4688,1996 | 10.1142/S0217751X96002145 | THU-96/26 | gr-qc | null | If one assumes the validity of conventional quantum field theory in the
vicinity of the horizon of a black hole, one does not find a quantum mechanical
description of the entire black hole that even remotely resembles that of
conventional forms of matter; in contrast with matter made out of ordinary
particles one fin... | [
{
"created": "Tue, 9 Jul 1996 12:39:20 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Hooft",
"G. 't",
""
]
] | If one assumes the validity of conventional quantum field theory in the vicinity of the horizon of a black hole, one does not find a quantum mechanical description of the entire black hole that even remotely resembles that of conventional forms of matter; in contrast with matter made out of ordinary particles one finds... |
0806.3613 | Davi Rodrigues | Davi C. Rodrigues | Evolution of Anisotropies in Eddington-Born-Infeld Cosmology | 10 pages, 7 figures. v2: ref. added, v3: figs. improved, new
paragraph in the Conclusions. Accepted in PRD | Phys.Rev.D78:063013,2008 | 10.1103/PhysRevD.78.063013 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently a Born-Infeld action for dark energy and dark matter that uses
additional affine connections was proposed. At background level, it was shown
that the new proposal can mimic the standard cosmological evolution. In Bianchi
cosmologies, contrary to the scalar field approach (e.g., Chaplygin gas), the
new approa... | [
{
"created": "Mon, 23 Jun 2008 05:50:51 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Jun 2008 07:17:15 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Sep 2008 17:26:45 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Rodrigues",
"Davi C.",
""
]
] | Recently a Born-Infeld action for dark energy and dark matter that uses additional affine connections was proposed. At background level, it was shown that the new proposal can mimic the standard cosmological evolution. In Bianchi cosmologies, contrary to the scalar field approach (e.g., Chaplygin gas), the new approach... |
2404.00374 | Suvrat Raju | Suvrat Raju | How does information emerge from a black hole? | 10 pages; non-technical essay written for the GRF 2024 awards for
essays on gravitation | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | An examination of the constraints of quantum gravity leads to a clear
physical picture for how information about the initial state is transferred to
the Hawking radiation that emerges from a black hole.
| [
{
"created": "Sat, 30 Mar 2024 13:58:29 GMT",
"version": "v1"
}
] | 2024-04-02 | [
[
"Raju",
"Suvrat",
""
]
] | An examination of the constraints of quantum gravity leads to a clear physical picture for how information about the initial state is transferred to the Hawking radiation that emerges from a black hole. |
1704.06728 | Kai Lin | Kai Lin, Fei-Hung Ho and Wei-Liang Qian | Charged Einstein-\ae ther black holes in $n$-dimensional spacetime | https://www.worldscientific.com/doi/pdf/10.1142/S0218271819500494 | null | 10.1142/S0218271819500494 | International Journal of Modern Physics D, Vol. 28 (2019) 1950049 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we investigate the $n$-dimensional charged static black hole
solutions in the Einstein-\ae ther theory. By taking the metric parameter $k$
to be $1,0$, and $-1$, we obtain the spherical, planar, and hyperbolic
spacetimes respectively. Three choices of the cosmological constant,
$\Lambda>0$, $\Lambda=0$ ... | [
{
"created": "Sat, 22 Apr 2017 00:43:45 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Jun 2017 12:50:34 GMT",
"version": "v2"
},
{
"created": "Thu, 10 Jan 2019 13:54:43 GMT",
"version": "v3"
}
] | 2019-01-11 | [
[
"Lin",
"Kai",
""
],
[
"Ho",
"Fei-Hung",
""
],
[
"Qian",
"Wei-Liang",
""
]
] | In this work, we investigate the $n$-dimensional charged static black hole solutions in the Einstein-\ae ther theory. By taking the metric parameter $k$ to be $1,0$, and $-1$, we obtain the spherical, planar, and hyperbolic spacetimes respectively. Three choices of the cosmological constant, $\Lambda>0$, $\Lambda=0$ an... |
0806.2587 | Bernd Schroers | S Majid and B J Schroers | q-Deformation and Semidualisation in 3d Quantum Gravity | 49 pages, one pdf figure; revised version (several small changes,
improved figure) similar to one which will appear in J.Phys.A | null | null | EMPG-08-09 | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore in detail the role in euclidean 3d quantum gravity of quantum Born
reciprocity or `semidualisation'. The latter is an algebraic operation defined
using quantum group methods that interchanges position and momentum. Using this
we are able to clarify the structural relationships between the effective
non-com... | [
{
"created": "Mon, 16 Jun 2008 14:09:18 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Sep 2009 11:01:01 GMT",
"version": "v2"
}
] | 2009-09-18 | [
[
"Majid",
"S",
""
],
[
"Schroers",
"B J",
""
]
] | We explore in detail the role in euclidean 3d quantum gravity of quantum Born reciprocity or `semidualisation'. The latter is an algebraic operation defined using quantum group methods that interchanges position and momentum. Using this we are able to clarify the structural relationships between the effective non-commu... |
2206.13941 | Rodrigo De Castro Lima PhD. | R. de C. Lima, T. M. Guimar\~aes, S. H. Pereira | A pilot study on canonical gravity with mass dimension one fermions | Larevtex4, 12 pages with 0 figures | Journal of High Energy Physics 2022 | 10.1007/JHEP09(2022)132 | 2022, 132 (2022) | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mass dimension one (MDO) fermionic field is built on a complete set of
dual-helicity eigenspinors of the charge conjugation operator, which obeys the
statistic of Fermi-Dirac. These spinors are a potential candidate for the
description of dark matter. The redefinition of the dual structure of this
object holds a ... | [
{
"created": "Sat, 25 Jun 2022 16:52:50 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Sep 2022 21:16:11 GMT",
"version": "v2"
}
] | 2022-09-21 | [
[
"Lima",
"R. de C.",
""
],
[
"Guimarães",
"T. M.",
""
],
[
"Pereira",
"S. H.",
""
]
] | The mass dimension one (MDO) fermionic field is built on a complete set of dual-helicity eigenspinors of the charge conjugation operator, which obeys the statistic of Fermi-Dirac. These spinors are a potential candidate for the description of dark matter. The redefinition of the dual structure of this object holds a lo... |
gr-qc/0205023 | B. V. Ivanov | B.V.Ivanov | On rigidly rotating perfect fluid cylinders | 10 pages, Revtex (galley) | Class.Quant.Grav. 19 (2002) 3851 | 10.1088/0264-9381/19/14/323 | null | gr-qc | null | The gravitational field of a rigidly rotating perfect fluid cylinder with
gamma- law equation of state is found analytically. The solution has two
parameters and is physically realistic for gamma in the interval (1.41,2].
Closed timelike curves always appear at large distances.
| [
{
"created": "Tue, 7 May 2002 09:08:40 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Ivanov",
"B. V.",
""
]
] | The gravitational field of a rigidly rotating perfect fluid cylinder with gamma- law equation of state is found analytically. The solution has two parameters and is physically realistic for gamma in the interval (1.41,2]. Closed timelike curves always appear at large distances. |
gr-qc/0301066 | Gennadi Sardanashvily | G.Sardanashvily | The gauge condition in gravitation theory with a background metric | 5 pages | null | null | null | gr-qc | null | In gravitation theory with a background metric, a gravitational field is
described by a (1,1)-tensor field. The energy-momentum conservation law imposes
a gauge condition on this field.
| [
{
"created": "Sun, 19 Jan 2003 05:11:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sardanashvily",
"G.",
""
]
] | In gravitation theory with a background metric, a gravitational field is described by a (1,1)-tensor field. The energy-momentum conservation law imposes a gauge condition on this field. |
1508.05090 | Subenoy Chakraborty | Sourav Haldar, Sudipto Bhattacharjee and Subenoy Chakraborty | Unified first law and some general prescription: a redefinition of
surface gravity | 7 pages | Eur. Phys. J. C 77, 604 (2017) | 10.1140/epjc/s10052-017-5179-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The paper contains an extensive study of the unified first law (UFL) in the
Friedmann-Robertson-Walker spacetime model. By projecting the UFL along the
Kodama vector the second Friedmann equation can be obtained. Also studying the
UFL on the event horizon it is found that Clausius relation cannot be obtained
from the... | [
{
"created": "Thu, 20 Aug 2015 09:01:26 GMT",
"version": "v1"
},
{
"created": "Tue, 10 May 2016 08:38:09 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Oct 2017 12:07:25 GMT",
"version": "v3"
}
] | 2017-10-26 | [
[
"Haldar",
"Sourav",
""
],
[
"Bhattacharjee",
"Sudipto",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | The paper contains an extensive study of the unified first law (UFL) in the Friedmann-Robertson-Walker spacetime model. By projecting the UFL along the Kodama vector the second Friedmann equation can be obtained. Also studying the UFL on the event horizon it is found that Clausius relation cannot be obtained from the U... |
2210.01584 | Kimet Jusufi | Kimet Jusufi, Ahmad Sheykhi | Entropic corrections to Friedmann equations and bouncing universe due to
the zero-point length | Typo corrected in Eq. (13), results remain unchanged | Phys. Lett. B 836 (2023) 137621 | 10.1016/j.physletb.2022.137621 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We employ Verlinde's entropic force scenario to extract the modified
Friedmann equations by taking into account the zero-point length correction to
the gravitational potential. Starting form the modified gravitational potential
due to the zero-point length, we first find the logarithmic corrections to the
entropy exp... | [
{
"created": "Mon, 3 Oct 2022 10:46:56 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Dec 2022 17:21:05 GMT",
"version": "v2"
},
{
"created": "Tue, 7 Nov 2023 16:34:17 GMT",
"version": "v3"
}
] | 2023-11-08 | [
[
"Jusufi",
"Kimet",
""
],
[
"Sheykhi",
"Ahmad",
""
]
] | We employ Verlinde's entropic force scenario to extract the modified Friedmann equations by taking into account the zero-point length correction to the gravitational potential. Starting form the modified gravitational potential due to the zero-point length, we first find the logarithmic corrections to the entropy expre... |
gr-qc/0408050 | Jorge Pullin | Rodolfo Gambini, Rafael Porto, Jorge Pullin | Fundamental decoherence from relational time in discrete quantum
gravity: Galilean covariance | 10 pages, RevTex | Phys.Rev. D70 (2004) 124001 | 10.1103/PhysRevD.70.124001 | LSU-REL-081604 | gr-qc | null | We have recently argued that if one introduces a relational time in quantum
mechanics and quantum gravity, the resulting quantum theory is such that pure
states evolve into mixed states. The rate at which states decohere depends on
the energy of the states. There is therefore the question of how this can be
reconcile... | [
{
"created": "Mon, 16 Aug 2004 20:40:31 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gambini",
"Rodolfo",
""
],
[
"Porto",
"Rafael",
""
],
[
"Pullin",
"Jorge",
""
]
] | We have recently argued that if one introduces a relational time in quantum mechanics and quantum gravity, the resulting quantum theory is such that pure states evolve into mixed states. The rate at which states decohere depends on the energy of the states. There is therefore the question of how this can be reconciled ... |
1105.3480 | Antonino Marciano | Stephon Alexander, Antonino Marciano and Ruggero Altair Tacchi | Towards a Loop Quantum Gravity and Yang-Mills Unification | 4 pages, 2 figures | null | 10.1016/j.physletb.2012.07.034 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new method of unifying gravity and the Standard Model by
introducing a spin-foam model. We realize a unification between an SU(2)
Yang-Mills interaction and 3D general relativity by considering a Spin(4)
Plebanski action. The theory is quantized a la spin-foam by implementing the
analogue of the simplici... | [
{
"created": "Tue, 17 May 2011 20:01:26 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Oct 2011 01:16:15 GMT",
"version": "v2"
}
] | 2015-05-28 | [
[
"Alexander",
"Stephon",
""
],
[
"Marciano",
"Antonino",
""
],
[
"Tacchi",
"Ruggero Altair",
""
]
] | We propose a new method of unifying gravity and the Standard Model by introducing a spin-foam model. We realize a unification between an SU(2) Yang-Mills interaction and 3D general relativity by considering a Spin(4) Plebanski action. The theory is quantized a la spin-foam by implementing the analogue of the simplicial... |
1211.2513 | Cosimo Bambi | Cosimo Bambi | Testing the space-time geometry around black hole candidates with the
analysis of the broad K$\alpha$ iron line | 14 pages, 9 figures. v2: refereed version covering a wider range of
spins and inclinations | Phys.Rev.D87:023007,2013 | 10.1103/PhysRevD.87.023007 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Astrophysical black hole candidates are thought to be the Kerr black holes
predicted by General Relativity, but there is not yet clear evidence that the
geometry of the space-time around these objects is really described by the Kerr
metric. In order to confirm the Kerr black hole hypothesis, we have to observe
strong... | [
{
"created": "Mon, 12 Nov 2012 05:32:53 GMT",
"version": "v1"
},
{
"created": "Sat, 19 Jan 2013 21:46:06 GMT",
"version": "v2"
}
] | 2013-01-28 | [
[
"Bambi",
"Cosimo",
""
]
] | Astrophysical black hole candidates are thought to be the Kerr black holes predicted by General Relativity, but there is not yet clear evidence that the geometry of the space-time around these objects is really described by the Kerr metric. In order to confirm the Kerr black hole hypothesis, we have to observe strong g... |
1204.2396 | Yasuo Ezawa | Yasuo Ezawa and Yoshiaki Ohkuwa | The equivalence theorem in the generalized gravity of f(R)-type and
canonical quantization II | 23 pages. Ecept for the change of style from {book} to {article} and
related changes, e.g., addition of abstract and the form of References, as
well as the addition of Appendix B, the work has been published as one of the
chapters in the book "Advances in Quantum Theory" (2012, ed. Ion I. Cotaescu;
InTech Open ... | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We first review the equivalence theorem of the f(R)-type gravity to Einstein
gravity with a scalar field by deriving it in a self-contained and pedagogical
way. Then we describe the problem of to what extent the equivalence holds. Main
problems are (i) Is the surface term given by Gibbons and Hawking which is
necessa... | [
{
"created": "Wed, 11 Apr 2012 10:06:09 GMT",
"version": "v1"
}
] | 2015-03-13 | [
[
"Ezawa",
"Yasuo",
""
],
[
"Ohkuwa",
"Yoshiaki",
""
]
] | We first review the equivalence theorem of the f(R)-type gravity to Einstein gravity with a scalar field by deriving it in a self-contained and pedagogical way. Then we describe the problem of to what extent the equivalence holds. Main problems are (i) Is the surface term given by Gibbons and Hawking which is necessary... |
gr-qc/0306129 | U\u{g}ur Camci | U. Camci and M. Sharif | Matter collineations of Spacetime Homogeneous G\"odel-type Metrics | 12 pages, LaTex, no figures, Class. Quantum.Grav.20 (2003) 2169 | Class.Quant.Grav. 20 (2003) 2169 | 10.1088/0264-9381/20/11/316 | null | gr-qc | null | The spacetime homogeneous G\"odel-type spacetimes which have four classes of
metrics are studied according to their matter collineations. The obtained
results are compared with Killing vectors and Ricci collineations. It is found
that these spacetimes have infinite number of matter collineations in
degenerate case, i... | [
{
"created": "Mon, 30 Jun 2003 16:18:48 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Camci",
"U.",
""
],
[
"Sharif",
"M.",
""
]
] | The spacetime homogeneous G\"odel-type spacetimes which have four classes of metrics are studied according to their matter collineations. The obtained results are compared with Killing vectors and Ricci collineations. It is found that these spacetimes have infinite number of matter collineations in degenerate case, i.e... |
1904.12789 | Rodrigo Baptista | Riccardo March, Orfeu Bertolami, Marco Muccino, Rodrigo Baptista,
Simone Dell'Agnello | Constraining a nonminimally coupled curvature-matter gravity model with
ocean experiments | 17 pages, 5 figures | Phys. Rev. D 100, 042002 (2019) | 10.1103/PhysRevD.100.042002 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the constraints on the Yukawa regime from the non-minimally
coupled curvature-matter gravity theory arising from deep underwater ocean
experiments. We consider the geophysical experiment of Zumberge et al. of 1991
for searching deviations of Newton's inverse square law in ocean. In the
context of non-minim... | [
{
"created": "Mon, 29 Apr 2019 16:06:42 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Nov 2019 11:21:21 GMT",
"version": "v2"
}
] | 2019-11-19 | [
[
"March",
"Riccardo",
""
],
[
"Bertolami",
"Orfeu",
""
],
[
"Muccino",
"Marco",
""
],
[
"Baptista",
"Rodrigo",
""
],
[
"Dell'Agnello",
"Simone",
""
]
] | We examine the constraints on the Yukawa regime from the non-minimally coupled curvature-matter gravity theory arising from deep underwater ocean experiments. We consider the geophysical experiment of Zumberge et al. of 1991 for searching deviations of Newton's inverse square law in ocean. In the context of non-minimal... |
1509.06581 | Richard O'Shaughnessy | R. O'Shaughnessy (1), P. Nepal (2), A. Lundgren (3) ((1) CCRG,
Rochester Institute of Technology, (2) University of Wisconsin-Milwaukee, (3)
Albert Einstein Institue, Hannover) | A semianalytic Fisher matrix for precessing binaries with a single
significant spin | 5 pages, to be submitted to PRL | null | null | LIGO P1500173 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waves from a binary with a single dynamically significant spin,
notably including precessing black hole-neutron star (BH-NS) binaries, let us
constrain that binary's properties: the two masses and the dominant black hole
spin. Based on a straightforward fourier transform of $h(t)$ enabled by the
corotat... | [
{
"created": "Tue, 22 Sep 2015 12:59:32 GMT",
"version": "v1"
}
] | 2015-09-23 | [
[
"O'Shaughnessy",
"R.",
""
],
[
"Nepal",
"P.",
""
],
[
"Lundgren",
"A.",
""
]
] | Gravitational waves from a binary with a single dynamically significant spin, notably including precessing black hole-neutron star (BH-NS) binaries, let us constrain that binary's properties: the two masses and the dominant black hole spin. Based on a straightforward fourier transform of $h(t)$ enabled by the corotatin... |
1909.09409 | Kirill Bronnikov | K.A. Bronnikov | String clouds and radiation flows as sources of gravity in static or
rotating cylinders | 8 pages, no figures, submitted to Proceedings of 10th Alexander
Friedmann International Seminar on Gravitation and Cosmology, St. Petersburg,
June 23-29, 2019 | Int. J. Mod. Phys. A 35, 2040004 (2020) | 10.1142/S0217751X20400047 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Static and stationary cylindrically symmetric space-times in general
relativity are considered, supported by distributions of cosmic strings
stretched in the azimuthal ($\varphi$), longitudinal ($z$) or radial ($x$)
directions or and by pairs of mutually opposite radiation flows in any of these
directions. For such s... | [
{
"created": "Fri, 20 Sep 2019 10:19:18 GMT",
"version": "v1"
}
] | 2020-10-20 | [
[
"Bronnikov",
"K. A.",
""
]
] | Static and stationary cylindrically symmetric space-times in general relativity are considered, supported by distributions of cosmic strings stretched in the azimuthal ($\varphi$), longitudinal ($z$) or radial ($x$) directions or and by pairs of mutually opposite radiation flows in any of these directions. For such sys... |
gr-qc/9703052 | David Scialom | Philippe Jetzer and David Scialom | Time evolution of the perturbations for a complex scalar field in
Friedmann-Lemaitre universe | Latex file with 5 figures. Accepted for publication in Phys. Rev. D | Phys.Rev. D55 (1997) 7440-7450 | 10.1103/PhysRevD.55.7440 | ZU-TH 33/96 | gr-qc astro-ph | null | We study the time evolution of small classical perturbations in a gauge
invariant way for a complex scalar field in the early zero curvature
Friedmann-Lema\^{\i}tre universe. We, thus, generalize the analysis which has
been done so far for a real scalar field. We give also a derivation of the
Jeans wavenumber in the ... | [
{
"created": "Thu, 20 Mar 1997 13:31:08 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Jetzer",
"Philippe",
""
],
[
"Scialom",
"David",
""
]
] | We study the time evolution of small classical perturbations in a gauge invariant way for a complex scalar field in the early zero curvature Friedmann-Lema\^{\i}tre universe. We, thus, generalize the analysis which has been done so far for a real scalar field. We give also a derivation of the Jeans wavenumber in the Ne... |
gr-qc/0305045 | Eric D. Carlson | Eric D. Carlson, William H. Hirsch, Benedikt Obermayer, Paul R.
Anderson, Peter B. Groves | Stress-Energy Tensor for the Massless Spin 1/2 Field in Static Black
Hole Spacetimes | 5 pages, 4 figures, additional discussion | Phys.Rev.Lett. 91 (2003) 051301 | 10.1103/PhysRevLett.91.051301 | null | gr-qc hep-th | null | The stress-energy tensor for the massless spin 1/2 field is numerically
computed outside and on the event horizons of both charged and uncharged static
non-rotating black holes, corresponding to the Schwarzschild,
Reissner-Nordstrom and extreme Reissner-Nordstr\"om solutions of Einstein's
equations. The field is assu... | [
{
"created": "Mon, 12 May 2003 21:06:56 GMT",
"version": "v1"
},
{
"created": "Fri, 16 May 2003 16:02:06 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Carlson",
"Eric D.",
""
],
[
"Hirsch",
"William H.",
""
],
[
"Obermayer",
"Benedikt",
""
],
[
"Anderson",
"Paul R.",
""
],
[
"Groves",
"Peter B.",
""
]
] | The stress-energy tensor for the massless spin 1/2 field is numerically computed outside and on the event horizons of both charged and uncharged static non-rotating black holes, corresponding to the Schwarzschild, Reissner-Nordstrom and extreme Reissner-Nordstr\"om solutions of Einstein's equations. The field is assume... |
1912.10159 | Dennis Philipp | Dennis Philipp, Eva Hackmann, Claus L\"ammerzahl, and J\"urgen
M\"uller | The Relativistic Geoid: Gravity Potential and Relativistic Effects | final version, 16 pages, 5 figures, added journal reference | Phys. Rev. D 101, 064032 (2020) | 10.1103/PhysRevD.101.064032 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Earth's geoid is one of the most essential and fundamental concepts to
provide a gravity field-related height reference in geodesy and associated
sciences. To keep up with the ever-increasing experimental capabilities and to
consistently interpret high-precision measurements without any doubt, a
relativistic trea... | [
{
"created": "Sat, 21 Dec 2019 01:42:59 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Mar 2020 16:10:18 GMT",
"version": "v2"
}
] | 2020-03-25 | [
[
"Philipp",
"Dennis",
""
],
[
"Hackmann",
"Eva",
""
],
[
"Lämmerzahl",
"Claus",
""
],
[
"Müller",
"Jürgen",
""
]
] | The Earth's geoid is one of the most essential and fundamental concepts to provide a gravity field-related height reference in geodesy and associated sciences. To keep up with the ever-increasing experimental capabilities and to consistently interpret high-precision measurements without any doubt, a relativistic treatm... |
1407.7798 | Mohd. Shahalam | R. Myrzakulov, M. Shahalam | Light mass galileon and late time acceleration of the Universe | 11 pages, 9 figures | Gen. Relativ. Gravit. (2015) 47:81 | 10.1007/s10714-015-1915-3 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study Galileon scalar field model by considering the lowest order Galileon
term in the lagrangian, $(\partial_{\mu} \phi)^2 \Box\phi$ by invoking a field
potential. We use Statefinder hierarchy to distinguish the light mass galileon
models with different potentials amongst themselves and from the $\Lambda$CDM
beha... | [
{
"created": "Sat, 26 Jul 2014 07:49:53 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Aug 2014 13:54:27 GMT",
"version": "v2"
},
{
"created": "Sat, 27 Jun 2015 09:20:13 GMT",
"version": "v3"
}
] | 2015-06-30 | [
[
"Myrzakulov",
"R.",
""
],
[
"Shahalam",
"M.",
""
]
] | We study Galileon scalar field model by considering the lowest order Galileon term in the lagrangian, $(\partial_{\mu} \phi)^2 \Box\phi$ by invoking a field potential. We use Statefinder hierarchy to distinguish the light mass galileon models with different potentials amongst themselves and from the $\Lambda$CDM behavi... |
1205.3458 | Rafael Perez | J. C. Fabris, R. S. Perez, S. E. Perez Bergliaffa, N. Pinto-Neto | A Born-Infeld-like f(R) gravity | Latex file, 14 pages, 7 figures (jpg format), including more detailed
discussions than previous version, accepted for publication in Physical
Review D | Phys. Rev. D 86, 103525 (2012) | 10.1103/PhysRevD.86.103525 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several features of an $f(R)$ theory in which there is a maximum value for
the curvature are analyzed. The theory admits the vaccuum solutions of GR, and
also the radiation evolution for the scale factor of the standard cosmological
model. Working in the Jordan frame, a complete analysis of the phase space is
perform... | [
{
"created": "Tue, 15 May 2012 17:51:54 GMT",
"version": "v1"
},
{
"created": "Wed, 16 May 2012 17:04:19 GMT",
"version": "v2"
},
{
"created": "Thu, 8 Nov 2012 13:57:31 GMT",
"version": "v3"
}
] | 2013-01-08 | [
[
"Fabris",
"J. C.",
""
],
[
"Perez",
"R. S.",
""
],
[
"Bergliaffa",
"S. E. Perez",
""
],
[
"Pinto-Neto",
"N.",
""
]
] | Several features of an $f(R)$ theory in which there is a maximum value for the curvature are analyzed. The theory admits the vaccuum solutions of GR, and also the radiation evolution for the scale factor of the standard cosmological model. Working in the Jordan frame, a complete analysis of the phase space is performed... |
gr-qc/0510124 | Alan Kostelecky | Alan Kostelecky and Robertus Potting | Gravity from Local Lorentz Violation | 6 pages, accepted in General Relativity and Gravitation | Gen.Rel.Grav.37:1675-1679,2005; Int.J.Mod.Phys.D14:2341-2346,2005 | 10.1142/S021827180500811X 10.1007/s10714-005-0149-1 | IUHET 482, March 2005 | gr-qc | null | In general relativity, gravitational waves propagate at the speed of light,
and so gravitons are massless. The masslessness can be traced to symmetry under
diffeomorphisms. However, another elegant possibility exists: masslessness can
instead arise from spontaneous violation of local Lorentz invariance. We
construct ... | [
{
"created": "Sat, 29 Oct 2005 19:18:11 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Kostelecky",
"Alan",
""
],
[
"Potting",
"Robertus",
""
]
] | In general relativity, gravitational waves propagate at the speed of light, and so gravitons are massless. The masslessness can be traced to symmetry under diffeomorphisms. However, another elegant possibility exists: masslessness can instead arise from spontaneous violation of local Lorentz invariance. We construct th... |
2203.07719 | Jose Luis Hernandez-Pastora | J.L. Hernandez-Pastora | Whom actually do multipole moments belong to? | null | The European Physical Journal C, Eur. Phys. J. C (2022) 82:224 | 10.1140/epjc/s10052-022-10190-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using an integral definition to calculate the relativistic multipole moments
(RMM), and the ensuing generalized relativistic Gauss theorem, we prove that
the evaluation of that volume integral in Erez-Rosen coordinates, leads to a
specific link between the RMM and the source of the exterior space--time,
provided we h... | [
{
"created": "Tue, 15 Mar 2022 08:17:59 GMT",
"version": "v1"
}
] | 2022-03-16 | [
[
"Hernandez-Pastora",
"J. L.",
""
]
] | Using an integral definition to calculate the relativistic multipole moments (RMM), and the ensuing generalized relativistic Gauss theorem, we prove that the evaluation of that volume integral in Erez-Rosen coordinates, leads to a specific link between the RMM and the source of the exterior space--time, provided we hav... |
1810.01276 | Vasilis Oikonomou | S.D. Odintsov, V.K. Oikonomou, A.V. Timoshkin, Emmanuel N. Saridakis,
R. Myrzakulov | Cosmological Fluids with Logarithmic Equation of State | AoP accepted | null | 10.1016/j.aop.2018.09.015 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the cosmological applications of fluids having an equation of
state which is the analog to the one related to the isotropic deformation of
crystalline solids, that is containing logarithmic terms of the energy density,
allowing additionally for a bulk viscosity. We consider two classes of
scenarios and... | [
{
"created": "Sun, 30 Sep 2018 17:56:55 GMT",
"version": "v1"
}
] | 2018-11-14 | [
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K.",
""
],
[
"Timoshkin",
"A. V.",
""
],
[
"Saridakis",
"Emmanuel N.",
""
],
[
"Myrzakulov",
"R.",
""
]
] | We investigate the cosmological applications of fluids having an equation of state which is the analog to the one related to the isotropic deformation of crystalline solids, that is containing logarithmic terms of the energy density, allowing additionally for a bulk viscosity. We consider two classes of scenarios and w... |
1907.09619 | Gil de Oliveira-Neto | G. Oliveira-Neto and L. G. Rezende Rodrigues | Noncommutative cosmological models induced by a symplectic formalism
coupled to phantom fluids | Modified version with 23 pages, 7 figures and more references | null | 10.1142/S0217751X19502063 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present letter, we consider homogeneous and isotropic noncommutative
cosmological models induced by a symplectic formalism coupled to phantom
perfect fluids and a cosmological constant. After computing the field
equations, we solve them to find the scalar factor dynamics. We restrict our
attention to expansive... | [
{
"created": "Mon, 22 Jul 2019 22:47:37 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Oct 2019 13:13:43 GMT",
"version": "v2"
}
] | 2020-01-08 | [
[
"Oliveira-Neto",
"G.",
""
],
[
"Rodrigues",
"L. G. Rezende",
""
]
] | In the present letter, we consider homogeneous and isotropic noncommutative cosmological models induced by a symplectic formalism coupled to phantom perfect fluids and a cosmological constant. After computing the field equations, we solve them to find the scalar factor dynamics. We restrict our attention to expansive s... |
0908.2160 | J. Ponce de Leon | J. Ponce de Leon | 4D spacetimes embedded in 5D light-like Kasner universes | To appear in Classical and Quantum Gravity | Class.Quant.Grav.26:185013,2009 | 10.1088/0264-9381/26/18/185013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider spatially homogeneous, anisotropic cosmological models in 5D
whose line element can be written as $dS^2 = {\cal{A}}(u, v)du dv -
{\cal{B}}_{i j}(u, v)dx^{i}dx^{j}$, $(i, j = 1, 2, 3)$, where $u$ and $v$ are
light-like coordinates. In the case where ${\cal{B}}_{i j}$ is diagonal, we
construct three familie... | [
{
"created": "Sat, 15 Aug 2009 04:28:18 GMT",
"version": "v1"
}
] | 2009-11-05 | [
[
"de Leon",
"J. Ponce",
""
]
] | We consider spatially homogeneous, anisotropic cosmological models in 5D whose line element can be written as $dS^2 = {\cal{A}}(u, v)du dv - {\cal{B}}_{i j}(u, v)dx^{i}dx^{j}$, $(i, j = 1, 2, 3)$, where $u$ and $v$ are light-like coordinates. In the case where ${\cal{B}}_{i j}$ is diagonal, we construct three families ... |
0809.5216 | L. A. Glinka | L. A. Glinka | Macrostates thermodynamics and its stable classical limit in Global
One-Dimensional Quantum General Relativity | 17 pages, no figures | Old and New Concepts of Physics, Vol. 6, N1, 19-42, 2009 | 10.2478/v10005-009-0002-5 | null | gr-qc hep-th math-ph math.MP | http://creativecommons.org/licenses/by/3.0/ | Global One--Dimensional Quantum General Relativity is the toy model with
nontrivial field theoretical content, describing classical one-dimensional
massive bosonic fields related to any 3+1 metric, where the dimension is a
volume of three-dimensional embedding. In fact it constitutes the
midisuperspatial Quantum Grav... | [
{
"created": "Tue, 30 Sep 2008 17:00:26 GMT",
"version": "v1"
}
] | 2009-10-23 | [
[
"Glinka",
"L. A.",
""
]
] | Global One--Dimensional Quantum General Relativity is the toy model with nontrivial field theoretical content, describing classical one-dimensional massive bosonic fields related to any 3+1 metric, where the dimension is a volume of three-dimensional embedding. In fact it constitutes the midisuperspatial Quantum Gravit... |
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