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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/0610001 | Ying-Qiu Gu | Ying-Qiu Gu | The Simplification of Spinor Connection and Classical Approximation | 12 pages, no figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The standard spinor connection in curved space-time is represented in a
compact form. In this form the calculation is complicated, and its physical
effects are concealed. In this paper, we split spinor connection into two
vectors $\Upsilon_\mu$ and $\Omega_\mu$, where $\Upsilon_\mu$ is only related
to geometrical cal... | [
{
"created": "Sat, 30 Sep 2006 02:41:21 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Dec 2006 12:31:38 GMT",
"version": "v2"
},
{
"created": "Thu, 16 Apr 2009 05:15:35 GMT",
"version": "v3"
},
{
"created": "Fri, 11 Sep 2009 12:42:45 GMT",
"version": "v4"
},
{
"c... | 2017-11-28 | [
[
"Gu",
"Ying-Qiu",
""
]
] | The standard spinor connection in curved space-time is represented in a compact form. In this form the calculation is complicated, and its physical effects are concealed. In this paper, we split spinor connection into two vectors $\Upsilon_\mu$ and $\Omega_\mu$, where $\Upsilon_\mu$ is only related to geometrical calcu... |
gr-qc/9908030 | Philippe Ruelle | Y. Wiaux | Gauge freedom for Gravitational Wave problems in tensor-scalar theories
of gravity | 11 pages, no figure | Class.Quant.Grav. 16 (1999) 3771 | 10.1088/0264-9381/16/12/301 | UCL-IPT-99-09 | gr-qc | null | A specific choice of gauge is shown to imply a decoupling between the tensor
and scalar components of Gravitational Radiation in the context of Brans-Dicke
type theories of gravitation. The comparison of the predictions of these
theories with those of General Relativity is thereby made straightforward.
| [
{
"created": "Tue, 10 Aug 1999 09:55:55 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Oct 1999 12:18:31 GMT",
"version": "v2"
}
] | 2007-08-14 | [
[
"Wiaux",
"Y.",
""
]
] | A specific choice of gauge is shown to imply a decoupling between the tensor and scalar components of Gravitational Radiation in the context of Brans-Dicke type theories of gravitation. The comparison of the predictions of these theories with those of General Relativity is thereby made straightforward. |
2304.08456 | Mustapha Azreg-A\"inou | Mustapha Azreg-A\"inou and Hoang Ky Nguyen | A stationary axisymmetric vacuum solution for pure $R^2$ gravity | 9 pages, 4 figures | Phys. Scr. vol. 98, 125025, 2023 | 10.1088/1402-4896/ad0eb8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The closed-form expression for pure $\mathcal{R}^{2}$ vacuum solution
obtained in Phys. Rev. D \textbf{107}, 104008 (2023) lends itself to a
generalization to axisymmetric setup via the modified Newman--Janis algorithm.
We adopt the procedure put forth in Phys. Rev. D \textbf{90}, 064041 (2014)
bypassing the complexi... | [
{
"created": "Mon, 17 Apr 2023 17:29:33 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Aug 2023 04:39:21 GMT",
"version": "v2"
},
{
"created": "Thu, 30 Nov 2023 17:24:55 GMT",
"version": "v3"
}
] | 2023-12-01 | [
[
"Azreg-Aïnou",
"Mustapha",
""
],
[
"Nguyen",
"Hoang Ky",
""
]
] | The closed-form expression for pure $\mathcal{R}^{2}$ vacuum solution obtained in Phys. Rev. D \textbf{107}, 104008 (2023) lends itself to a generalization to axisymmetric setup via the modified Newman--Janis algorithm. We adopt the procedure put forth in Phys. Rev. D \textbf{90}, 064041 (2014) bypassing the complexifi... |
1007.2815 | Alfredo Sandoval-Villalbazo | A. L. Garcia-Perciante, A. Sandoval-Villalbazo, L.S. Garcia-Colin | On the microscopic nature of dissipative effects in special relativistic
kinetic theory | 20 pages | Journal of non-equilibrium thermodynamics 37, 4361 (2012) | 10.1515/jnet.2011.025 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A microscopic formulation of the definition of both the heat flux and the
viscous stress tensor is proposed in the framework of kinetic theory for
relativistic gases emphasizing on the physical nature of such fluxes. A Lorentz
transformation is introduced as the link between the laboratory and local
comoving frames a... | [
{
"created": "Fri, 16 Jul 2010 17:07:05 GMT",
"version": "v1"
}
] | 2012-04-20 | [
[
"Garcia-Perciante",
"A. L.",
""
],
[
"Sandoval-Villalbazo",
"A.",
""
],
[
"Garcia-Colin",
"L. S.",
""
]
] | A microscopic formulation of the definition of both the heat flux and the viscous stress tensor is proposed in the framework of kinetic theory for relativistic gases emphasizing on the physical nature of such fluxes. A Lorentz transformation is introduced as the link between the laboratory and local comoving frames and... |
1601.00353 | Christine Gruber | Christine Gruber | Black hole thermodynamics in finite time | 4 pages, 2 figures, Proceedings of the 14th Marcel Grossmann Meeting | null | null | null | gr-qc astro-ph.HE cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Finite-time thermodynamics provides the means to revisit ideal thermodynamic
equilibrium processes in the light of reality and investigate the energetic
"price of haste", i.e. the consequences of carrying out a process in finite
time, when perfect equilibrium cannot be awaited due to economic reasons or the
nature of... | [
{
"created": "Sun, 3 Jan 2016 23:15:24 GMT",
"version": "v1"
}
] | 2016-01-05 | [
[
"Gruber",
"Christine",
""
]
] | Finite-time thermodynamics provides the means to revisit ideal thermodynamic equilibrium processes in the light of reality and investigate the energetic "price of haste", i.e. the consequences of carrying out a process in finite time, when perfect equilibrium cannot be awaited due to economic reasons or the nature of t... |
2103.16856 | Salvatore Capozziello | Andrea Addazi, Salvatore Capozziello, and Sergei D. Odintsov | Chaotic Solutions and Black Hole Shadow in $f(R)$ gravity | 16 pages, 2 figures, accepted for publication in Phys. Lett. B | null | 10.1016/j.physletb.2021.136257 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the emergence of black hole shadow and photon-sphere in the
context of $f(R)$ gravity. It is shown that the shadow is exponentially
sensitive to linear instabilities of metric coming from some $f(R)$ solutions.
Thus, the instabilities of photon circular trajectories, delimiting the black
hole photon-sphere... | [
{
"created": "Wed, 31 Mar 2021 07:11:18 GMT",
"version": "v1"
}
] | 2021-04-28 | [
[
"Addazi",
"Andrea",
""
],
[
"Capozziello",
"Salvatore",
""
],
[
"Odintsov",
"Sergei D.",
""
]
] | We discuss the emergence of black hole shadow and photon-sphere in the context of $f(R)$ gravity. It is shown that the shadow is exponentially sensitive to linear instabilities of metric coming from some $f(R)$ solutions. Thus, the instabilities of photon circular trajectories, delimiting the black hole photon-sphere, ... |
0712.1278 | Sunil Maharaj | K. Komathiraj, S. D. Maharaj | Analytical models for quark stars | 10 pages, To appear in Int. J. Mod. Phys. D | Int.J.Mod.Phys.D16:1803-1811,2007 | 10.1142/S0218271807011103 | null | gr-qc | null | We find two new classes of exact solutions to the Einstein-Maxwell system of
equations. The matter content satisfies a linear equation of state consistent
with quark matter; a particular form of one of the gravitational potentials is
specified to generate solutions. The exact solutions can be written in terms of
elem... | [
{
"created": "Sat, 8 Dec 2007 11:38:56 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Komathiraj",
"K.",
""
],
[
"Maharaj",
"S. D.",
""
]
] | We find two new classes of exact solutions to the Einstein-Maxwell system of equations. The matter content satisfies a linear equation of state consistent with quark matter; a particular form of one of the gravitational potentials is specified to generate solutions. The exact solutions can be written in terms of elemen... |
gr-qc/0102106 | Diego M. Forni | Diego M. Forni, Mirta S. Iriondo, Carlos N. Kozameh and M. F. Parisi | Understanding singularities in Cartan's and NSF geometric structures | 22 pages, 2 figures | J.Math.Phys. 43 (2002) 1584-1597 | 10.1063/1.1408282 | null | gr-qc math-ph math.MP | null | In this work we establish a relationship between Cartan's geometric approach
to third order ODEs and the 3-dim Null Surface Formulation (NSF). We then
generalize both constructions to allow for caustics and singularities that
necessarily arise in these formalisms.
| [
{
"created": "Tue, 27 Feb 2001 20:37:46 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Forni",
"Diego M.",
""
],
[
"Iriondo",
"Mirta S.",
""
],
[
"Kozameh",
"Carlos N.",
""
],
[
"Parisi",
"M. F.",
""
]
] | In this work we establish a relationship between Cartan's geometric approach to third order ODEs and the 3-dim Null Surface Formulation (NSF). We then generalize both constructions to allow for caustics and singularities that necessarily arise in these formalisms. |
1507.02198 | Giorgio Papini | Giorgio Papini | Maximal acceleration and radiative processes | Eight pages, three figures | Mod. Phys. Lett. A, Vol. 30, No. 31 (2015) | 10.1142/S0217732315501667 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the radiation characteristics of an accelerated, charged particle
in a model due to Caianiello in which the proper acceleration of a particle of
mass $m$ has the upper limit $\mathcal{A}_m=2mc^3/\hbar$. We find two power
laws, one applicable to lower accelerations, the other more suitable for
accelerations ... | [
{
"created": "Wed, 8 Jul 2015 15:29:59 GMT",
"version": "v1"
}
] | 2015-09-01 | [
[
"Papini",
"Giorgio",
""
]
] | We derive the radiation characteristics of an accelerated, charged particle in a model due to Caianiello in which the proper acceleration of a particle of mass $m$ has the upper limit $\mathcal{A}_m=2mc^3/\hbar$. We find two power laws, one applicable to lower accelerations, the other more suitable for accelerations cl... |
1105.2646 | Vladimir S. Manko | V.S. Manko, E. Ruiz and M.B. Sadovnikova | Stationary configurations of two extreme black holes obtainable from the
Kinnersley-Chitre solution | final version revised according to referee's suggestions | Phys.Rev.D84:064005,2011 | 10.1103/PhysRevD.84.064005 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Stationary axisymmetric systems of two extreme Kerr sources separated by a
massless strut, which arise as subfamilies of the well-known Kinnersley-Chitre
solution, are studied. We present explicit analytical formulas for the
individual masses and angular momenta of the constituents and establish the
range of the para... | [
{
"created": "Fri, 13 May 2011 08:17:07 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Oct 2011 05:31:44 GMT",
"version": "v2"
}
] | 2015-05-28 | [
[
"Manko",
"V. S.",
""
],
[
"Ruiz",
"E.",
""
],
[
"Sadovnikova",
"M. B.",
""
]
] | Stationary axisymmetric systems of two extreme Kerr sources separated by a massless strut, which arise as subfamilies of the well-known Kinnersley-Chitre solution, are studied. We present explicit analytical formulas for the individual masses and angular momenta of the constituents and establish the range of the parame... |
gr-qc/9812035 | Hakan Andreasson | Hakan Andreasson | Global foliations of matter spacetimes with Gowdy symmetry | Latex, 40 pages, submitted to CMP | Commun.Math.Phys. 206 (1999) 337-365 | 10.1007/s002200050708 | null | gr-qc | null | A global existence theorem, with respect to a geometrically defined time, is
shown for Gowdy symmetric globally hyperbolic solutions of the Einstein-Vlasov
system for arbitrary (in size) initial data. The spacetimes being studied
contain both matter and gravitational waves.
| [
{
"created": "Thu, 10 Dec 1998 19:22:09 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Andreasson",
"Hakan",
""
]
] | A global existence theorem, with respect to a geometrically defined time, is shown for Gowdy symmetric globally hyperbolic solutions of the Einstein-Vlasov system for arbitrary (in size) initial data. The spacetimes being studied contain both matter and gravitational waves. |
0808.0397 | Zurab Silagadze | O.I. Chashchina, L. Iorio, Z.K. Silagadze | Elementary derivation of the Lense-Thirring precession | 16 pages, somewhat modified, a reference added, to be published in
Acta Physica Polonica B | Acta Phys.Polon.B40:2363-2378,2009 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An elementary pedagogical derivation of the Lense-Thirring precession is
given based on the use of Hamilton vector. The Hamilton vector is an extra
constant of motion of the Kepler/Coulomb problem related simply to the more
popular Runge-Lenz vector. When a velocity-dependent Lorentz-like
gravitomagnetic force is pre... | [
{
"created": "Mon, 4 Aug 2008 08:34:49 GMT",
"version": "v1"
},
{
"created": "Tue, 26 May 2009 16:28:41 GMT",
"version": "v2"
}
] | 2014-11-18 | [
[
"Chashchina",
"O. I.",
""
],
[
"Iorio",
"L.",
""
],
[
"Silagadze",
"Z. K.",
""
]
] | An elementary pedagogical derivation of the Lense-Thirring precession is given based on the use of Hamilton vector. The Hamilton vector is an extra constant of motion of the Kepler/Coulomb problem related simply to the more popular Runge-Lenz vector. When a velocity-dependent Lorentz-like gravitomagnetic force is prese... |
1704.05076 | Suprit Singh | Ramkishor Sharma and Suprit Singh | Multifaceted Schwinger effect in de Sitter space | 7 pages and 3 figures. Selected for Kaleidoscope in Physical Review D
July 2017 | Phys. Rev. D 96, 025012 (2017) | 10.1103/PhysRevD.96.025012 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate particle production \`a la Schwinger mechanism in an
expanding, flat de Sitter patch as is relevant for the inflationary epoch of
our universe. Defining states and particle content in curved spacetime is
certainly not a unique process. There being different prescriptions on how that
can be done, we hav... | [
{
"created": "Mon, 17 Apr 2017 18:05:38 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Sep 2017 18:00:17 GMT",
"version": "v2"
}
] | 2017-09-11 | [
[
"Sharma",
"Ramkishor",
""
],
[
"Singh",
"Suprit",
""
]
] | We investigate particle production \`a la Schwinger mechanism in an expanding, flat de Sitter patch as is relevant for the inflationary epoch of our universe. Defining states and particle content in curved spacetime is certainly not a unique process. There being different prescriptions on how that can be done, we have ... |
gr-qc/0504132 | Massimo Giovannini | Massimo Giovannini | Interacting viscous mixtures | 11 pages, figures included in eps style | Phys.Lett. B622 (2005) 349-355 | 10.1016/j.physletb.2005.07.013 | CERN-PH-TH-2005-068 | gr-qc | null | Gravitational and hydrodynamical perturbations are analysed in a relativistic
plasma containing a mixture of interacting fluids characterized by a
non-negligible bulk viscosity coefficient. The energy-momentum transfer between
the cosmological fluids, as well as the fluctuations of the bulk viscosity
coefficients, ar... | [
{
"created": "Wed, 27 Apr 2005 01:01:40 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Giovannini",
"Massimo",
""
]
] | Gravitational and hydrodynamical perturbations are analysed in a relativistic plasma containing a mixture of interacting fluids characterized by a non-negligible bulk viscosity coefficient. The energy-momentum transfer between the cosmological fluids, as well as the fluctuations of the bulk viscosity coefficients, are ... |
2201.03261 | Wittaya Thipaksorn | Wittaya Thipaksorn, Stharporn Sapa, Khamphee Karwan | Coupled dark energy model inspired from general conformal transformation | 25 pages, 7 figures, 2 tables, references added, accepted for
publication in PRD, texts relevant to momentum transfer are modified | Phys. Rev. D 105, 063527 (2022) | 10.1103/PhysRevD.105.063527 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the coupled dark energy model constructed from the general conformal
transformation in which the coefficient of the conformal transformation depends
on both the scalar field and its kinetic term. Under this conformal
transformation, the action for subclass of Degenerate Higher-Order
Scalar-Tensor (DHOST) the... | [
{
"created": "Mon, 10 Jan 2022 10:23:38 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jan 2022 14:33:59 GMT",
"version": "v2"
},
{
"created": "Sun, 6 Mar 2022 15:05:41 GMT",
"version": "v3"
},
{
"created": "Fri, 8 Apr 2022 07:16:47 GMT",
"version": "v4"
}
] | 2022-04-12 | [
[
"Thipaksorn",
"Wittaya",
""
],
[
"Sapa",
"Stharporn",
""
],
[
"Karwan",
"Khamphee",
""
]
] | We study the coupled dark energy model constructed from the general conformal transformation in which the coefficient of the conformal transformation depends on both the scalar field and its kinetic term. Under this conformal transformation, the action for subclass of Degenerate Higher-Order Scalar-Tensor (DHOST) theor... |
1805.11174 | Alexander Nitz | Alexander H. Nitz, Tito Dal Canton, Derek Davis, Steven Reyes | PyCBC Live: Rapid Detection of Gravitational Waves from Compact Binary
Mergers | 10 pages, 5 figures, submitted to Physical Review D | Phys. Rev. D 98, 024050 (2018) | 10.1103/PhysRevD.98.024050 | LIGO-P1800139 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce an efficient and straightforward technique for rapidly detecting
gravitational waves from compact binary mergers. We show that this method
achieves the low latencies required to alert electromagnetic partners of
candidate binary mergers, aids in data monitoring, and makes use of
multidetector networks fo... | [
{
"created": "Mon, 28 May 2018 21:00:54 GMT",
"version": "v1"
}
] | 2018-08-08 | [
[
"Nitz",
"Alexander H.",
""
],
[
"Canton",
"Tito Dal",
""
],
[
"Davis",
"Derek",
""
],
[
"Reyes",
"Steven",
""
]
] | We introduce an efficient and straightforward technique for rapidly detecting gravitational waves from compact binary mergers. We show that this method achieves the low latencies required to alert electromagnetic partners of candidate binary mergers, aids in data monitoring, and makes use of multidetector networks for ... |
gr-qc/0104078 | Malakhaltsev Mikhail A. | V. Bashkov, M. Malakhaltsev | Relativistic mechanics on rotating disk | null | null | null | null | gr-qc | null | We find equations of particle motion from the point of view of observer on a
rotating disk, and demonstrate that a particle moving along a rotating disk is
influenced by forces arising from geometry. They can be considered as analogs
of the centrifugal forces and the Coriolis forces.
| [
{
"created": "Wed, 25 Apr 2001 11:36:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bashkov",
"V.",
""
],
[
"Malakhaltsev",
"M.",
""
]
] | We find equations of particle motion from the point of view of observer on a rotating disk, and demonstrate that a particle moving along a rotating disk is influenced by forces arising from geometry. They can be considered as analogs of the centrifugal forces and the Coriolis forces. |
0807.3619 | Manfred Requardt | M. Requardt | About the Minimal Resolution of Space-Time Grains in Experimental
Quantum Gravity | 28 pages, Latex | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We critically analyse and compare various recent thought experiments,
performed by Amelino-Camelia, Ng et al., Baez et al., Adler et al., and
ourselves, concerning the (thought)experimental accessibility of the Planck
scale by space-time measurements. We show that a closer inspection of the
working of the measuring d... | [
{
"created": "Wed, 23 Jul 2008 08:19:00 GMT",
"version": "v1"
}
] | 2008-07-24 | [
[
"Requardt",
"M.",
""
]
] | We critically analyse and compare various recent thought experiments, performed by Amelino-Camelia, Ng et al., Baez et al., Adler et al., and ourselves, concerning the (thought)experimental accessibility of the Planck scale by space-time measurements. We show that a closer inspection of the working of the measuring dev... |
1206.1164 | Stefan Hollands | Stefan Hollands and Akihiro Ishibashi | Black hole uniqueness theorems in higher dimensional spacetimes | Extended version of "Topical Review" article commissioned by Class.
Quant. Grav., 66 pages, several figures, Latex. v2: Added section on near
horizon geometries, edited/added references | null | 10.1088/0264-9381/29/16/163001 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review uniqueness theorems as well as other general results about higher
dimensional black hole spacetimes. This includes in particular theorems about
the topology of higher dimensional spacetimes, theorems about their symmetries
(rigidity theorem), and the classification of supersymmetric black holes. We
outline ... | [
{
"created": "Wed, 6 Jun 2012 09:55:59 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Aug 2012 11:52:48 GMT",
"version": "v2"
}
] | 2015-06-05 | [
[
"Hollands",
"Stefan",
""
],
[
"Ishibashi",
"Akihiro",
""
]
] | We review uniqueness theorems as well as other general results about higher dimensional black hole spacetimes. This includes in particular theorems about the topology of higher dimensional spacetimes, theorems about their symmetries (rigidity theorem), and the classification of supersymmetric black holes. We outline th... |
1901.00932 | Stanley Deser | S.Deser | Non-Lagrangian Gauge Field Models are Physically Excluded | Published version | Phys.Lett. B790 (2019) 408-409 | 10.1016/j.physletb.2019.01.044 | BRX-TH 6645, CALT-TH 2019 001 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | While non-action generated, but identically conserved,-abelian and non-gauge
vectors exist, they are unsuitable for building alternate field equations
because they have no stress-tensor, hence do not permit Poincare generators
and, most phiyically, cannot couple consistently to gravity. Separately, their
geometric an... | [
{
"created": "Thu, 3 Jan 2019 22:45:28 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Jan 2019 18:51:19 GMT",
"version": "v2"
}
] | 2019-03-14 | [
[
"Deser",
"S.",
""
]
] | While non-action generated, but identically conserved,-abelian and non-gauge vectors exist, they are unsuitable for building alternate field equations because they have no stress-tensor, hence do not permit Poincare generators and, most phiyically, cannot couple consistently to gravity. Separately, their geometric anal... |
gr-qc/9905002 | Carey Carpenter Briggs | C. C. Briggs | General Expressions for the Coefficients of Chern Forms Up to the 13th
Order in Curvature | 27 pages | null | null | null | gr-qc | null | General expressions are given for the coefficients of Chern forms up to the
13th order in curvature in terms of the Riemann-Christoffel curvature tensor
and some of its concomitants (e.g., Pontrjagin's characteristic tensors) for
n-dimensional differentiable manifolds having a general linear connection.
| [
{
"created": "Mon, 3 May 1999 02:59:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Briggs",
"C. C.",
""
]
] | General expressions are given for the coefficients of Chern forms up to the 13th order in curvature in terms of the Riemann-Christoffel curvature tensor and some of its concomitants (e.g., Pontrjagin's characteristic tensors) for n-dimensional differentiable manifolds having a general linear connection. |
gr-qc/9209011 | Steve Carlip | S. Carlip | The Modular Group, Operator Ordering, and Time in (2+1)-Dimensional
Gravity | 8 pages, LaTeX | Phys.Rev.D47:4520-4524,1993 | 10.1103/PhysRevD.47.4520 | UCD-92-23 | gr-qc hep-th | null | A choice of time-slicing in classical general relativity permits the
construction of time-dependent wave functions in the ``frozen time''
Chern-Simons formulation of $(2+1)$-dimensional quantum gravity. Because of
operator ordering ambiguities, however, these wave functions are not unique. It
is shown that when space... | [
{
"created": "Fri, 25 Sep 1992 00:12:08 GMT",
"version": "v1"
}
] | 2010-04-28 | [
[
"Carlip",
"S.",
""
]
] | A choice of time-slicing in classical general relativity permits the construction of time-dependent wave functions in the ``frozen time'' Chern-Simons formulation of $(2+1)$-dimensional quantum gravity. Because of operator ordering ambiguities, however, these wave functions are not unique. It is shown that when space h... |
2005.03417 | Thomas P. Kling | Thomas P. Kling, Faizuddin Ahmed and Megan Lalumiere | Wave Fronts in a Causality Violating Godel-Type Metric | final version to Advances in High Energy Physics | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The light-rays and wave fronts in a flat class of Godel-type metric are
examined to reveal the causality violating features of the space-time.
Non-causal features demonstrated by the development of unusual wave front
singularities are shown to be related to the non-monotonic advance of time
along the light rays, as m... | [
{
"created": "Thu, 7 May 2020 12:32:53 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Jul 2020 10:47:31 GMT",
"version": "v2"
}
] | 2020-07-10 | [
[
"Kling",
"Thomas P.",
""
],
[
"Ahmed",
"Faizuddin",
""
],
[
"Lalumiere",
"Megan",
""
]
] | The light-rays and wave fronts in a flat class of Godel-type metric are examined to reveal the causality violating features of the space-time. Non-causal features demonstrated by the development of unusual wave front singularities are shown to be related to the non-monotonic advance of time along the light rays, as mea... |
1304.6381 | T. Damour | Thibault Damour and Philippe Spindel | Quantum Supersymmetric Cosmology and its Hidden Kac-Moody Structure | 5 pages; a few additional explanatory sentences (in the abstract and
the introduction) | null | 10.1088/0264-9381/30/16/162001 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the quantum dynamics of a supersymmetric squashed three-sphere by
dimensionally reducing (to one timelike dimension) the action of D=4 simple
supergravity for an SO(3)-homogeneous (Bianchi IX) cosmological model. The
quantization of the homogeneous gravitino field leads to a 64-dimensional
fermionic Hilbert ... | [
{
"created": "Tue, 23 Apr 2013 18:57:07 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jun 2013 08:58:47 GMT",
"version": "v2"
}
] | 2015-06-15 | [
[
"Damour",
"Thibault",
""
],
[
"Spindel",
"Philippe",
""
]
] | We study the quantum dynamics of a supersymmetric squashed three-sphere by dimensionally reducing (to one timelike dimension) the action of D=4 simple supergravity for an SO(3)-homogeneous (Bianchi IX) cosmological model. The quantization of the homogeneous gravitino field leads to a 64-dimensional fermionic Hilbert sp... |
2404.14550 | Eduardo Bittencourt | \'Erico Goulart and Eduardo Bittencourt | Photon traps in nonlinear electrodynamics | 13 pages, 5 figures | null | null | null | gr-qc physics.optics | http://creativecommons.org/licenses/by/4.0/ | We demonstrate the existence of photon traps within the framework of
nonlinear electrodynamics. The trapping mechanism is based on the fact that,
for null background fields, the optical metric reduces to the Kerr-Schild form,
which plays a prominent role in the context of black hole physics. We then
construct explici... | [
{
"created": "Mon, 22 Apr 2024 19:43:35 GMT",
"version": "v1"
}
] | 2024-04-24 | [
[
"Goulart",
"Érico",
""
],
[
"Bittencourt",
"Eduardo",
""
]
] | We demonstrate the existence of photon traps within the framework of nonlinear electrodynamics. The trapping mechanism is based on the fact that, for null background fields, the optical metric reduces to the Kerr-Schild form, which plays a prominent role in the context of black hole physics. We then construct explicit ... |
gr-qc/0205105 | Dr Mayeul Arminjon | Mayeul Arminjon | The Scalar Ether-Theory of Gravitation and its First Test in Celestial
Mechanics | LaTeX, 6 pages, one figure. Text of a talk at the 5th Friedmann
International Seminar on Gravitation and Cosmology, Joao Pessoa (Brazil),
23-30 April 2002. Will be submitted to a special issue of Int. J. Mod.
Phys./A | Int.J.Mod.Phys. A17 (2002) 4203-4208 | 10.1142/S0217751X0201323X | null | gr-qc astro-ph | null | The motivations for investigating a theory of gravitation based on a concept
of "ether" are discussed-- a crucial point is the existence of an alternative
interpretation of special relativity, named the Lorentz-Poincar\'e ether
theory. The basic equations of one such theory of gravity, based on just one
scalar field,... | [
{
"created": "Fri, 24 May 2002 16:39:22 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Arminjon",
"Mayeul",
""
]
] | The motivations for investigating a theory of gravitation based on a concept of "ether" are discussed-- a crucial point is the existence of an alternative interpretation of special relativity, named the Lorentz-Poincar\'e ether theory. The basic equations of one such theory of gravity, based on just one scalar field, a... |
0803.0944 | Miguel S\'anchez | Antonio N. Bernal, Miguel S\'anchez, Francisco Jos\'e Soler Gil | Physics from scratch. Letter on M. Tegmark's ``The Mathematical
Universe'' | 7 pages, latex | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent article, M. Tegmark poses the hypothesis that our known universe
is a ``baggage free'' mathematical structure among many other possible ones,
which also correspond to other physical universes --Mathematical Universe
Hypothesis, MUH. Naturally, questions arise, such as how to obtain the physical
properties... | [
{
"created": "Thu, 6 Mar 2008 19:07:40 GMT",
"version": "v1"
}
] | 2008-03-07 | [
[
"Bernal",
"Antonio N.",
""
],
[
"Sánchez",
"Miguel",
""
],
[
"Gil",
"Francisco José Soler",
""
]
] | In a recent article, M. Tegmark poses the hypothesis that our known universe is a ``baggage free'' mathematical structure among many other possible ones, which also correspond to other physical universes --Mathematical Universe Hypothesis, MUH. Naturally, questions arise, such as how to obtain the physical properties o... |
gr-qc/0103020 | Yuri N. Obukhov | Friedrich W. Hehl and Yuri N. Obukhov | On the energy-momentum current of the electromagnetic field in a
pre-metric axiomatic approach. I | 25 pages, Revtex, Dedicated to the memory of our friend and colleague
Ruggiero de Ritis from Napoli | null | null | null | gr-qc hep-th physics.class-ph | null | We complete a metric-free axiomatic framework for electrodynamics by
introducing the appropriate energy-momentum current Sigma of the
electromagnetic field. We start from the Lorentz force density and motivate the
form of Sigma. Then we postulate it (fourth axiom) and discuss its properties.
In particular, it is foun... | [
{
"created": "Wed, 7 Mar 2001 22:20:28 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hehl",
"Friedrich W.",
""
],
[
"Obukhov",
"Yuri N.",
""
]
] | We complete a metric-free axiomatic framework for electrodynamics by introducing the appropriate energy-momentum current Sigma of the electromagnetic field. We start from the Lorentz force density and motivate the form of Sigma. Then we postulate it (fourth axiom) and discuss its properties. In particular, it is found ... |
1902.07968 | Aroonkumar Beesham | Aroonkumar Beesham and Alireza Sepehri | Expansion and contraction of accretion disks of a rotating thermal BIon
in a Rindler space-time | 12 pages, 3 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we consider the evolution of accretion disks of a rotating
BIon in a Rindler space-time. This space-time emerges because of the
acceleration of the disks in a BIon. A BIon is constructed from a pair of
accretion disks that are connected by a wormhole. We will show that in a
rotating BIon, by increasing... | [
{
"created": "Thu, 21 Feb 2019 11:12:21 GMT",
"version": "v1"
}
] | 2019-02-22 | [
[
"Beesham",
"Aroonkumar",
""
],
[
"Sepehri",
"Alireza",
""
]
] | In this paper, we consider the evolution of accretion disks of a rotating BIon in a Rindler space-time. This space-time emerges because of the acceleration of the disks in a BIon. A BIon is constructed from a pair of accretion disks that are connected by a wormhole. We will show that in a rotating BIon, by increasing t... |
1710.09294 | Bahia Si Lakhal | Houda Mansour, Bahia Si Lakhal and Abdelkader Yanallah | Weakly Charged Compact Stars in $f \left( R \right)$ gravity | 12 pages, 7 figures | null | 10.1088/1475-7516/2018/06/006 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study electrically charged compact stars in the framework of extended
theory of gravity (ETG). We assume that the charge density is proportional to
the energy density. The polytropic equation of state is chosen to describe the
state of the charged perfect fluid. We aim to find the Oppenheimer Volkoff (OV)
mass lim... | [
{
"created": "Wed, 25 Oct 2017 15:09:41 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Nov 2017 20:00:34 GMT",
"version": "v2"
}
] | 2022-08-03 | [
[
"Mansour",
"Houda",
""
],
[
"Lakhal",
"Bahia Si",
""
],
[
"Yanallah",
"Abdelkader",
""
]
] | We study electrically charged compact stars in the framework of extended theory of gravity (ETG). We assume that the charge density is proportional to the energy density. The polytropic equation of state is chosen to describe the state of the charged perfect fluid. We aim to find the Oppenheimer Volkoff (OV) mass limit... |
gr-qc/0403064 | Mu-Lin Yan | Hua Bai, Mu-Lin Yan | Quantum Horizons | 7 pages, No figures, LaTeX file | null | null | USTC-ICTS-04-05 | gr-qc hep-ph hep-th | null | Treating macro-black hole as quantum states, and using Brown-York quaselocal
gravitational energy definition and Heisenberg uncertainty principle, we find
out the classical horizon with singularity spreads into a quantum horizon in
which the space-time is non-commutative and the spread range is determined
dynamically... | [
{
"created": "Mon, 15 Mar 2004 16:05:26 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Mar 2004 15:24:46 GMT",
"version": "v2"
},
{
"created": "Sun, 20 Jun 2004 15:01:35 GMT",
"version": "v3"
},
{
"created": "Fri, 11 Feb 2005 09:17:39 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"Bai",
"Hua",
""
],
[
"Yan",
"Mu-Lin",
""
]
] | Treating macro-black hole as quantum states, and using Brown-York quaselocal gravitational energy definition and Heisenberg uncertainty principle, we find out the classical horizon with singularity spreads into a quantum horizon in which the space-time is non-commutative and the spread range is determined dynamically. ... |
gr-qc/9806102 | Kirill A. Bronnikov | K.A. Bronnikov | Gravitating Brane Systems: Some General Theorems | 13 pages, Latex2e, 1 Latex figure, uses bezier.sty | J.Math.Phys. 40 (1999) 924-938 | 10.1063/1.532695 | RGS-VNIIMS-11/98 | gr-qc hep-th | null | Multidimensional gravity interacting with intersecting electric and magnetic
$p$-branes is considered for fields depending on a single variable. Some
general features of the system behaviour are revealed without solving the field
equations. Thus, essential asymptotic properties of isotropic cosmologies are
indicated ... | [
{
"created": "Fri, 26 Jun 1998 07:43:54 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Bronnikov",
"K. A.",
""
]
] | Multidimensional gravity interacting with intersecting electric and magnetic $p$-branes is considered for fields depending on a single variable. Some general features of the system behaviour are revealed without solving the field equations. Thus, essential asymptotic properties of isotropic cosmologies are indicated fo... |
1906.05531 | Yorgo Senikoglu | Tekin Dereli, Yorgo Senikoglu | Dark range of $\omega$ in Brans-Dicke gravity | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The variational field equations of Brans-Dicke scalar-tensor theory of
gravitation are presented in a Riemannian and non-Riemannian setting in the
language of exterior differential forms over 4-dimensional spacetime. In Rosen
coordinates, the equations of motion of non-spinning test masses are considered
in a gravita... | [
{
"created": "Thu, 13 Jun 2019 07:57:51 GMT",
"version": "v1"
}
] | 2019-06-14 | [
[
"Dereli",
"Tekin",
""
],
[
"Senikoglu",
"Yorgo",
""
]
] | The variational field equations of Brans-Dicke scalar-tensor theory of gravitation are presented in a Riemannian and non-Riemannian setting in the language of exterior differential forms over 4-dimensional spacetime. In Rosen coordinates, the equations of motion of non-spinning test masses are considered in a gravitati... |
2210.06194 | Charles Badger | Charles Badger, Katarina Martinovic, Alejandro Torres-Forn\'e, Mairi
Sakellariadou, Jos\'e A. Font | Dictionary learning: a novel approach to detecting binary black holes in
the presence of Galactic noise with LISA | 6 pages, 3 figures | null | 10.1103/PhysRevLett.130.091401 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The noise produced by the inspiral of millions of white dwarf binaries in the
Milky Way may pose a threat to one of the main goals of the space-based LISA
mission: the detection of massive black hole binary mergers. We present a novel
study for reconstruction of merger waveforms in the presence of Galactic
confusion ... | [
{
"created": "Wed, 12 Oct 2022 13:26:28 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Oct 2022 13:43:03 GMT",
"version": "v2"
}
] | 2023-03-08 | [
[
"Badger",
"Charles",
""
],
[
"Martinovic",
"Katarina",
""
],
[
"Torres-Forné",
"Alejandro",
""
],
[
"Sakellariadou",
"Mairi",
""
],
[
"Font",
"José A.",
""
]
] | The noise produced by the inspiral of millions of white dwarf binaries in the Milky Way may pose a threat to one of the main goals of the space-based LISA mission: the detection of massive black hole binary mergers. We present a novel study for reconstruction of merger waveforms in the presence of Galactic confusion no... |
1105.3105 | John Barrow | John D. Barrow and Douglas J. Shaw | The Value of the Cosmological Constant | 6 pages. This article received Third Prize in the 2011 Gravity
Research Foundation Awards for Essays on Gravitation | General Relativity and Gravitation 43, 2555-2560 (2011) | 10.1007/s10714-011-1199-1 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We make the cosmological constant, {\Lambda}, into a field and restrict the
variations of the action with respect to it by causality. This creates an
additional Einstein constraint equation. It restricts the solutions of the
standard Einstein equations and is the requirement that the cosmological wave
function posses... | [
{
"created": "Mon, 16 May 2011 14:35:51 GMT",
"version": "v1"
}
] | 2015-05-28 | [
[
"Barrow",
"John D.",
""
],
[
"Shaw",
"Douglas J.",
""
]
] | We make the cosmological constant, {\Lambda}, into a field and restrict the variations of the action with respect to it by causality. This creates an additional Einstein constraint equation. It restricts the solutions of the standard Einstein equations and is the requirement that the cosmological wave function possess ... |
1808.03136 | Peter K.F. Kuhfittig | Peter K.F. Kuhfittig and Vance D. Gladney | A model for dark energy based on the theory of embedding | 8 pages, i figure | Advanced Studies in Theoretical Physics, vol. 12, no. 5, pp.
233-241 (2018) | 10.12988/astp.2018.8627 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A long-standing topic of interest in the general theory of relativity is the
embedding of curved spacetimes in higher-dimensional flat spacetimes. The main
purpose this paper is to show that the embedding theory can account for the
accelerated expansion of the Universe and thereby serve as a model for dark
energy. Th... | [
{
"created": "Thu, 9 Aug 2018 13:10:25 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Feb 2019 19:10:55 GMT",
"version": "v2"
},
{
"created": "Thu, 10 Jun 2021 14:27:28 GMT",
"version": "v3"
}
] | 2021-06-11 | [
[
"Kuhfittig",
"Peter K. F.",
""
],
[
"Gladney",
"Vance D.",
""
]
] | A long-standing topic of interest in the general theory of relativity is the embedding of curved spacetimes in higher-dimensional flat spacetimes. The main purpose this paper is to show that the embedding theory can account for the accelerated expansion of the Universe and thereby serve as a model for dark energy. This... |
gr-qc/0411033 | Chang Jun Gao | Chang Jun Gao | Arbitrary Dimensional Schwarzschild-FRW Black Holes | 10 pages | Class.Quant.Grav. 21 (2004) 4805-4810 | 10.1088/0264-9381/21/21/004 | null | gr-qc astro-ph | null | The metric of arbitrary dimensional Schwarzschild black hole in the
background of Friedman-Robertson-Walker universe is presented in the cosmic
coordinates system. In particular, the arbitrary dimensional Schwarzschild-de
Sitter metric is rewritten in the Schwarzschild coordinates system and basing
on which the even ... | [
{
"created": "Mon, 8 Nov 2004 01:56:59 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Nov 2004 09:09:05 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Gao",
"Chang Jun",
""
]
] | The metric of arbitrary dimensional Schwarzschild black hole in the background of Friedman-Robertson-Walker universe is presented in the cosmic coordinates system. In particular, the arbitrary dimensional Schwarzschild-de Sitter metric is rewritten in the Schwarzschild coordinates system and basing on which the even mo... |
1510.05939 | Ayan Banerjee | Ayan Banerjee, Farook Rahaman, Sayeedul Islam and Megan Govender | Braneworld gravastars admitting conformal motion | 10 pages, no figures, minor changes, references added, Accepted in
Eur.Phys.J. C | null | 10.1140/epjc/s10052-016-3887-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we study the Mazur and Mottola gravastar model within the
context of Randall-Sundrum II type braneworld scenario, based on the fact that
our four dimensional space-time is a three-brane, embedded in a five
dimensional bulk. We present exact solutions of the modified field equations in
each of the three ... | [
{
"created": "Fri, 16 Oct 2015 15:14:05 GMT",
"version": "v1"
},
{
"created": "Sat, 9 Jan 2016 16:11:05 GMT",
"version": "v2"
}
] | 2016-02-17 | [
[
"Banerjee",
"Ayan",
""
],
[
"Rahaman",
"Farook",
""
],
[
"Islam",
"Sayeedul",
""
],
[
"Govender",
"Megan",
""
]
] | In this work, we study the Mazur and Mottola gravastar model within the context of Randall-Sundrum II type braneworld scenario, based on the fact that our four dimensional space-time is a three-brane, embedded in a five dimensional bulk. We present exact solutions of the modified field equations in each of the three re... |
2310.00437 | Alan Cesar Ms | Eduardo Bittencourt, Alan G. Cesar and Jonas P. Pereira | Feasibility of singularity avoidance for a collapsing object due to a
scalar field | 16 pages, 5 figures | JCAP12(2023)037 | 10.1088/1475-7516/2023/12/037 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We study the problem of the gravitational collapse of an object as seen by an
external observer. We assume that the resultant spacetime is a match of an
external Vaidya spacetime with an interior
Friedmann-Lema\^itre-Robertson-Walker (FRLW) spacetime of any spatial curvature
and with a scalar field both minimally and... | [
{
"created": "Sat, 30 Sep 2023 17:21:32 GMT",
"version": "v1"
}
] | 2023-12-27 | [
[
"Bittencourt",
"Eduardo",
""
],
[
"Cesar",
"Alan G.",
""
],
[
"Pereira",
"Jonas P.",
""
]
] | We study the problem of the gravitational collapse of an object as seen by an external observer. We assume that the resultant spacetime is a match of an external Vaidya spacetime with an interior Friedmann-Lema\^itre-Robertson-Walker (FRLW) spacetime of any spatial curvature and with a scalar field both minimally and n... |
1701.06902 | H\'el\`ene Pihan-Le Bars | H. Pihan-Le Bars and C. Guerlin and Q.G. Bailey and S. Bize and P.
Wolf | Improved Tests of Lorentz Invariance in the Matter Sector using Atomic
Clocks | null | null | null | null | gr-qc hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For the purpose of searching for Lorentz-invariance violation in the minimal
Standard-Model Extension, we perfom a reanalysis of data obtained from the
$^{133}\text{Cs}$ fountain clock operating at SYRTE. The previous study led to
new limits on eight components of the $\tilde{c}_{\mu\nu}$ tensor, which
quantifies the... | [
{
"created": "Thu, 19 Jan 2017 22:50:03 GMT",
"version": "v1"
}
] | 2017-01-25 | [
[
"Bars",
"H. Pihan-Le",
""
],
[
"Guerlin",
"C.",
""
],
[
"Bailey",
"Q. G.",
""
],
[
"Bize",
"S.",
""
],
[
"Wolf",
"P.",
""
]
] | For the purpose of searching for Lorentz-invariance violation in the minimal Standard-Model Extension, we perfom a reanalysis of data obtained from the $^{133}\text{Cs}$ fountain clock operating at SYRTE. The previous study led to new limits on eight components of the $\tilde{c}_{\mu\nu}$ tensor, which quantifies the a... |
2108.05210 | Fredy Dubeibe | F. L. Dubeibe, Tareq Saeed, and Euaggelos E. Zotos | Effect of Multipole Moments in the Weak Field Limit of a Black Hole Plus
Halo Potential | 10 pages, 7 figures | The Astrophysical Journal, 908:74, (2021) | 10.3847/1538-4357/abcd9f | null | gr-qc nlin.CD | http://creativecommons.org/licenses/by/4.0/ | In this paper, we consider a Newtonian system whose relativistic counterpart
describes a superimposed halo with a black hole. Our aim is to determine how
the quadrupole and octupole moments affect the nature of the motion of a test
particle, moving in the close vicinity of the black hole. The different types
of traje... | [
{
"created": "Wed, 11 Aug 2021 13:19:12 GMT",
"version": "v1"
}
] | 2021-08-12 | [
[
"Dubeibe",
"F. L.",
""
],
[
"Saeed",
"Tareq",
""
],
[
"Zotos",
"Euaggelos E.",
""
]
] | In this paper, we consider a Newtonian system whose relativistic counterpart describes a superimposed halo with a black hole. Our aim is to determine how the quadrupole and octupole moments affect the nature of the motion of a test particle, moving in the close vicinity of the black hole. The different types of traject... |
gr-qc/9704055 | S. Antoci | S. Antoci and L. Mihich | A forgotten argument by Gordon uniquely selects Abraham's tensor as the
energy-momentum tensor for the electromagnetic field in homogeneous,
isotropic matter | Plain TeX, 9 pages, no figures, to appear in Nuovo Cimento B | Nuovo Cim. B112 (1997) 991-1001 | null | null | gr-qc physics.class-ph | null | Given the present status of the problem of the electromagnetic energy tensor
in matter, there is perhaps use in recalling a forgotten argument given in 1923
by W. Gordon. Let us consider a material medium which is homogeneous and
isotropic when viewed in its rest frame. For such a medium, Gordon's argument
allows to ... | [
{
"created": "Mon, 21 Apr 1997 18:50:40 GMT",
"version": "v1"
}
] | 2008-02-03 | [
[
"Antoci",
"S.",
""
],
[
"Mihich",
"L.",
""
]
] | Given the present status of the problem of the electromagnetic energy tensor in matter, there is perhaps use in recalling a forgotten argument given in 1923 by W. Gordon. Let us consider a material medium which is homogeneous and isotropic when viewed in its rest frame. For such a medium, Gordon's argument allows to re... |
1803.00172 | Pablo Antonio Cano Molina-Ni\~nirola | Pablo A. Cano | Lovelock action with nonsmooth boundaries | 33 pages, 2 figures; version published in PRD; few additional typos
corrected | Phys. Rev. D 97, 104048 (2018) | 10.1103/PhysRevD.97.104048 | IFT-UAM/CSIC-18-020 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the variational problem in Lovelock gravity when the boundary
contains timelike and spacelike segments nonsmoothly glued. We show that two
kinds of contributions have to be added to the action. The first one is
associated to the presence of a boundary in every segment and it depends on
intrinsic and extrin... | [
{
"created": "Thu, 1 Mar 2018 02:27:45 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Mar 2018 17:26:44 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Oct 2018 10:39:00 GMT",
"version": "v3"
}
] | 2018-10-09 | [
[
"Cano",
"Pablo A.",
""
]
] | We examine the variational problem in Lovelock gravity when the boundary contains timelike and spacelike segments nonsmoothly glued. We show that two kinds of contributions have to be added to the action. The first one is associated to the presence of a boundary in every segment and it depends on intrinsic and extrinsi... |
1711.05693 | Deepak Vaid | Deepak Vaid | Connecting Loop Quantum Gravity and String Theory via Quantum Geometry | v1: A slightly modified version of this paper ws submitted to the
"Beyond Spacetime" 2017 essay contest on Sep 25, 2017, v2: references
updated, improved layout v3: added section on Immirzi parameter, expanded
conclusion, prepared for Submission to SciPost | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by-sa/4.0/ | We argue that String Theory and Loop Quantum Gravity can be thought of as
describing different regimes of a single unified theory of quantum gravity. LQG
can be thought of as providing the pre-geometric exoskeleton out of which
macroscopic geometry emerges and String Theory then becomes the
\emph{effective} theory wh... | [
{
"created": "Wed, 15 Nov 2017 17:40:58 GMT",
"version": "v1"
},
{
"created": "Sun, 19 Nov 2017 17:35:16 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Jan 2018 09:46:53 GMT",
"version": "v3"
}
] | 2018-01-09 | [
[
"Vaid",
"Deepak",
""
]
] | We argue that String Theory and Loop Quantum Gravity can be thought of as describing different regimes of a single unified theory of quantum gravity. LQG can be thought of as providing the pre-geometric exoskeleton out of which macroscopic geometry emerges and String Theory then becomes the \emph{effective} theory whic... |
1202.6289 | P\'eter Kov\'acs Dr. | P. Forg\'acs, T. Herpay, P. Kov\'acs | Comment on "Finite Size Corrections to the Radiation Reaction Force in
Classical Electrodynamics" [arXiv:1005.2617] | 1 page | null | 10.1103/PhysRevLett.109.029501 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In [1, arXiv:1005.2617] effective field theory methods have been employed to
compute the equations of motion of a spherically symmetric charged shell of
radius R, taking into account the radiation reaction force exerted by the
shell's own electromagnetic field up to O(R^2). The authors of Ref. [1] have
stated that th... | [
{
"created": "Tue, 28 Feb 2012 17:10:38 GMT",
"version": "v1"
}
] | 2015-06-04 | [
[
"Forgács",
"P.",
""
],
[
"Herpay",
"T.",
""
],
[
"Kovács",
"P.",
""
]
] | In [1, arXiv:1005.2617] effective field theory methods have been employed to compute the equations of motion of a spherically symmetric charged shell of radius R, taking into account the radiation reaction force exerted by the shell's own electromagnetic field up to O(R^2). The authors of Ref. [1] have stated that the ... |
1002.4230 | Hao Wei | Hao Wei | Spinor Dark Energy and Cosmological Coincidence Problem | 9 pages, revtex4; v2: major revision, title changed, Phys. Lett. B in
press; v3: published version | Phys.Lett.B695:307-311,2011 | 10.1016/j.physletb.2010.10.053 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, the so-called Elko spinor field has been proposed to be a candidate
of dark energy. It is a non-standard spinor and has unusual properties. When
the Elko spinor field is used in cosmology, its unusual properties could bring
some interesting consequences. In the present work, we discuss the cosmological
coin... | [
{
"created": "Tue, 23 Feb 2010 07:31:00 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Oct 2010 07:00:00 GMT",
"version": "v2"
},
{
"created": "Mon, 20 Dec 2010 08:43:00 GMT",
"version": "v3"
}
] | 2010-12-21 | [
[
"Wei",
"Hao",
""
]
] | Recently, the so-called Elko spinor field has been proposed to be a candidate of dark energy. It is a non-standard spinor and has unusual properties. When the Elko spinor field is used in cosmology, its unusual properties could bring some interesting consequences. In the present work, we discuss the cosmological coinci... |
1401.5819 | Matti Raasakka | Daniele Oriti and Matti Raasakka | Asymptotic Analysis of the Ponzano-Regge Model with Non-Commutative
Metric Boundary Data | null | SIGMA 10 (2014), 067, 32 pages | 10.3842/SIGMA.2014.067 | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-sa/3.0/ | We apply the non-commutative Fourier transform for Lie groups to formulate
the non-commutative metric representation of the Ponzano-Regge spin foam model
for 3d quantum gravity. The non-commutative representation allows to express
the amplitudes of the model as a first order phase space path integral, whose
propertie... | [
{
"created": "Wed, 22 Jan 2014 22:28:56 GMT",
"version": "v1"
},
{
"created": "Thu, 15 May 2014 10:24:08 GMT",
"version": "v2"
},
{
"created": "Thu, 26 Jun 2014 04:58:24 GMT",
"version": "v3"
}
] | 2014-06-27 | [
[
"Oriti",
"Daniele",
""
],
[
"Raasakka",
"Matti",
""
]
] | We apply the non-commutative Fourier transform for Lie groups to formulate the non-commutative metric representation of the Ponzano-Regge spin foam model for 3d quantum gravity. The non-commutative representation allows to express the amplitudes of the model as a first order phase space path integral, whose properties ... |
0708.1408 | Xin Zhang | Xin Zhang | Can black holes be torn up by phantom dark energy in cyclic cosmology? | 6 pages, 2 figures; discussions added | Eur.Phys.J.C60:661-667,2009 | 10.1140/epjc/s10052-009-0967-5 | null | gr-qc astro-ph hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Infinitely cyclic cosmology is often frustrated by the black hole problem. It
has been speculated that this obstacle in cyclic cosmology can be removed by
taking into account a peculiar cyclic model derived from loop quantum cosmology
or the braneworld scenario, in which phantom dark energy plays a crucial role.
In t... | [
{
"created": "Fri, 10 Aug 2007 12:02:36 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Nov 2007 12:37:24 GMT",
"version": "v2"
},
{
"created": "Tue, 10 Mar 2009 10:01:14 GMT",
"version": "v3"
}
] | 2009-04-24 | [
[
"Zhang",
"Xin",
""
]
] | Infinitely cyclic cosmology is often frustrated by the black hole problem. It has been speculated that this obstacle in cyclic cosmology can be removed by taking into account a peculiar cyclic model derived from loop quantum cosmology or the braneworld scenario, in which phantom dark energy plays a crucial role. In thi... |
1312.7590 | Gabriel Leon | Gabriel Leon and Daniel Sudarsky | Origin of Structure: Primordial Bispectrum without non-Gaussianities | 27 pages. The model considered in this work, although conceptual and
technically correct, yields predictions that are the same as the standard
inflationary scenario. The interested readers are encouraged to consult
arXiv:1503.01417 for an updated version of this paper in which
distinguishable predictions are ma... | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The primordial bispectrum has been considered in the past decade as a
powerful probe of the physical processes taking place in the early Universe.
Within the inflationary paradigm, the properties of the bispectrum are one of
the keys that serves to discriminate among competing scenarios concerning the
details of the ... | [
{
"created": "Sun, 29 Dec 2013 21:12:34 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Jan 2014 07:37:46 GMT",
"version": "v2"
},
{
"created": "Fri, 6 Mar 2015 01:33:42 GMT",
"version": "v3"
}
] | 2015-03-09 | [
[
"Leon",
"Gabriel",
""
],
[
"Sudarsky",
"Daniel",
""
]
] | The primordial bispectrum has been considered in the past decade as a powerful probe of the physical processes taking place in the early Universe. Within the inflationary paradigm, the properties of the bispectrum are one of the keys that serves to discriminate among competing scenarios concerning the details of the or... |
1206.1320 | George Chapline F | George Chapline | Can a closed critical surface in a quark-gluon plasma serve as a model
for the behavior of quantum gravity near to an event horizon? | 11 pages, 1 figure | null | null | null | gr-qc hep-th nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Time stands still at a quantum critical point in the sense that correlation
functions near to the critical point are approximately independent of
frequency. In the case of a quantum liquid this would imply that classical
hydrodynamics breaks down near to the critical point, revealing the underlying
quantum degrees of... | [
{
"created": "Tue, 5 Jun 2012 22:44:32 GMT",
"version": "v1"
}
] | 2012-06-08 | [
[
"Chapline",
"George",
""
]
] | Time stands still at a quantum critical point in the sense that correlation functions near to the critical point are approximately independent of frequency. In the case of a quantum liquid this would imply that classical hydrodynamics breaks down near to the critical point, revealing the underlying quantum degrees of f... |
1904.04743 | Avadhut Purohit | Avadhut V Purohit | The scalar field and gravity combined variable in ADM theory | 13 pages, 1 graph | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The canonical theory of gravity together with the scalar field is written as
a combined variable theory in ADM form, in the classical and quantum theory.
FLRW $\kappa = 0$ cosmology is rewritten in the combined variable theory.
| [
{
"created": "Tue, 9 Apr 2019 15:45:55 GMT",
"version": "v1"
},
{
"created": "Wed, 1 May 2019 17:07:48 GMT",
"version": "v2"
},
{
"created": "Sun, 14 Jul 2019 18:08:13 GMT",
"version": "v3"
}
] | 2019-07-16 | [
[
"Purohit",
"Avadhut V",
""
]
] | The canonical theory of gravity together with the scalar field is written as a combined variable theory in ADM form, in the classical and quantum theory. FLRW $\kappa = 0$ cosmology is rewritten in the combined variable theory. |
2112.11300 | Mark Hannam | Mark Hannam, Charlie Hoy, Jonathan E. Thompson, Stephen Fairhurst,
Vivien Raymond, Marta Colleoni, Derek Davis, H\'ector Estell\'es, Carl-Johan
Haster, Adrian Helmling-Cornell, Sascha Husa, David Keitel, T. J. Massinger,
Alexis Men\'endez-V\'azquez, Kentaro Mogushi, Serguei Ossokine, Ethan Payne,
Geraint Pratte... | General-relativistic precession in a black-hole binary | 16 pages, 6 figures. Update to match published version | Nature 610 (2022) 7933, 652-655 | 10.1038/s41586-022-05212-z | LIGO-P2100452 | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | The general-relativistic phenomenon of spin-induced orbital precession has
not yet been observed in strong-field gravity. Gravitational-wave observations
of binary black holes (BBHs) are prime candidates, since we expect the
astrophysical binary population to contain precessing binaries. Imprints of
precession have b... | [
{
"created": "Tue, 21 Dec 2021 15:42:07 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Oct 2022 16:07:50 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Oct 2022 08:23:02 GMT",
"version": "v3"
},
{
"created": "Wed, 31 May 2023 19:50:14 GMT",
"version": "v4"
}
] | 2023-06-02 | [
[
"Hannam",
"Mark",
""
],
[
"Hoy",
"Charlie",
""
],
[
"Thompson",
"Jonathan E.",
""
],
[
"Fairhurst",
"Stephen",
""
],
[
"Raymond",
"Vivien",
""
],
[
"Colleoni",
"Marta",
""
],
[
"Davis",
"Derek",
""
],
[... | The general-relativistic phenomenon of spin-induced orbital precession has not yet been observed in strong-field gravity. Gravitational-wave observations of binary black holes (BBHs) are prime candidates, since we expect the astrophysical binary population to contain precessing binaries. Imprints of precession have bee... |
2309.07404 | LiFang Li | Xin-Yun Hu, Xiao-Xiong Zeng, Li-Fang Li, Peng Xu | Holographic Einstein rings of Non-commutative black holes | many figures. arXiv admin note: text overlap with arXiv:1811.12617 by
other authors | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | With the help of the AdS/CFT correspondence, we easily derive the desired
response function of QFT on the boundary. Using the virtual optical system with
a convex lens, we are able to obtain the image of the black hole from the
response function and further study the Einstein ring of the non-commutative
black holes. ... | [
{
"created": "Thu, 14 Sep 2023 03:16:22 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Sep 2023 06:51:42 GMT",
"version": "v2"
},
{
"created": "Fri, 22 Sep 2023 05:30:01 GMT",
"version": "v3"
},
{
"created": "Fri, 15 Dec 2023 14:24:29 GMT",
"version": "v4"
},
{
"c... | 2023-12-29 | [
[
"Hu",
"Xin-Yun",
""
],
[
"Zeng",
"Xiao-Xiong",
""
],
[
"Li",
"Li-Fang",
""
],
[
"Xu",
"Peng",
""
]
] | With the help of the AdS/CFT correspondence, we easily derive the desired response function of QFT on the boundary. Using the virtual optical system with a convex lens, we are able to obtain the image of the black hole from the response function and further study the Einstein ring of the non-commutative black holes. Al... |
1305.5984 | Ali Shojai | F. Shojai, R. Moti and F. Najdat | Tracker coupled quintessence | 8 figures | Phys. Rev. D. 87, 043007, 2013 | 10.1103/PhysRevD.87.043007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper two tracker solutions for conformally coupled quintessence
model is obtained. The first solution is determined by dividing the evolution
of the universe to matter and dark energy dominated epochs and then the allowed
bound on the equation of state parameter is obtained, such that a tracker
behaviour is ... | [
{
"created": "Sun, 26 May 2013 03:23:05 GMT",
"version": "v1"
}
] | 2015-06-16 | [
[
"Shojai",
"F.",
""
],
[
"Moti",
"R.",
""
],
[
"Najdat",
"F.",
""
]
] | In this paper two tracker solutions for conformally coupled quintessence model is obtained. The first solution is determined by dividing the evolution of the universe to matter and dark energy dominated epochs and then the allowed bound on the equation of state parameter is obtained, such that a tracker behaviour is re... |
2210.10948 | Yiqian Chen | Yiqian Chen, Peng Wang, Houwen Wu, Haitang Yang | Observational Appearance of a Freely-falling Star in an Asymmetric
Thin-shell Wormhole | 26 pages, 8 figures. arXiv admin note: substantial text overlap with
arXiv:2206.13705 | null | 10.1140/epjc/s10052-023-11486-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been recently reported that, at late times, the total luminosity of a
star freely falling in black holes decays exponentially with time, and one or
two series of flashes with decreasing intensity are seen by a specific
observer, depending on the number of photon spheres. In this paper, we examine
observational... | [
{
"created": "Thu, 20 Oct 2022 01:36:25 GMT",
"version": "v1"
}
] | 2023-05-24 | [
[
"Chen",
"Yiqian",
""
],
[
"Wang",
"Peng",
""
],
[
"Wu",
"Houwen",
""
],
[
"Yang",
"Haitang",
""
]
] | It has been recently reported that, at late times, the total luminosity of a star freely falling in black holes decays exponentially with time, and one or two series of flashes with decreasing intensity are seen by a specific observer, depending on the number of photon spheres. In this paper, we examine observational a... |
gr-qc/0301010 | Yoshiaki Himemoto | Takahiro Tanaka and Yoshiaki Himemoto | Generation of dark radiation in the bulk inflaton model | 7 pages, no figures, references added, presentation improved, final
version to be published in PRD | Phys.Rev.D67:104007,2003 | 10.1103/PhysRevD.67.104007 | null | gr-qc astro-ph hep-ph hep-th | null | We investigate the dynamics of a bulk scalar field with various decay
channels in the Randall-Sundrum infinite braneworld scenario. A bulk scalar
field in this scenario has a quasi-localized mode which dominates the late-time
behavior near the brane. As for this mode, an interesting point is the presence
of dissipati... | [
{
"created": "Sun, 5 Jan 2003 13:45:06 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Mar 2003 08:39:20 GMT",
"version": "v2"
},
{
"created": "Mon, 21 Apr 2003 05:41:50 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Tanaka",
"Takahiro",
""
],
[
"Himemoto",
"Yoshiaki",
""
]
] | We investigate the dynamics of a bulk scalar field with various decay channels in the Randall-Sundrum infinite braneworld scenario. A bulk scalar field in this scenario has a quasi-localized mode which dominates the late-time behavior near the brane. As for this mode, an interesting point is the presence of dissipation... |
1009.0982 | Sushant Ghosh Prof | Sushant G. Ghosh and Naresh Dadhich | Radiating black holes in Einstein-Yang-Mills theory and cosmic
censorship | 9 RevTeX pages, 1 figure | Phys.Rev.D82:044038,2010 | 10.1103/PhysRevD.82.044038 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Exact nonstatic spherically symmetric black-hole solution of the higher
dimensional Einstein-Yang-Mills equations for a null dust with Yang-Mills gauge
charge are obtained by employing Wu-Yang \textit{ansatz}, namely, HD-EYM Vaidya
solution. It is interesting to note that gravitational contribution of YM gauge
charge... | [
{
"created": "Mon, 6 Sep 2010 07:41:53 GMT",
"version": "v1"
}
] | 2011-11-10 | [
[
"Ghosh",
"Sushant G.",
""
],
[
"Dadhich",
"Naresh",
""
]
] | Exact nonstatic spherically symmetric black-hole solution of the higher dimensional Einstein-Yang-Mills equations for a null dust with Yang-Mills gauge charge are obtained by employing Wu-Yang \textit{ansatz}, namely, HD-EYM Vaidya solution. It is interesting to note that gravitational contribution of YM gauge charge f... |
gr-qc/0606007 | Wieslaw Rudnicki | W. Rudnicki, R. J. Budzynski, W. Kondracki | Generalized strong curvature singularities and weak cosmic censorship in
cosmological space-times | Latex, 7 pages, no figures, to be published in Mod. Phys. Lett. A | Mod.Phys.Lett. A21 (2006) 1501-1510 | 10.1142/S0217732306020913 | null | gr-qc | null | This paper is a further development of the approach to weak cosmic censorship
proposed by the authors in Ref. 5. We state and prove a modified version of
that work's main result under significantly relaxed assumptions on the
asymptotic structure of space--time. The result, which imposes strong
constraints on the occu... | [
{
"created": "Thu, 1 Jun 2006 19:13:05 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Rudnicki",
"W.",
""
],
[
"Budzynski",
"R. J.",
""
],
[
"Kondracki",
"W.",
""
]
] | This paper is a further development of the approach to weak cosmic censorship proposed by the authors in Ref. 5. We state and prove a modified version of that work's main result under significantly relaxed assumptions on the asymptotic structure of space--time. The result, which imposes strong constraints on the occurr... |
2011.02967 | Denitsa Staicova | Denitsa Staicova | Special cases of the Multi-Measure Model -- understanding the prolonged
inflation | 10 pages, 4 figures, final published version | JHEAp 36 (2022) 120-127 | 10.1016/j.jheap.2022.09.002 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The multi-measure model (MMM), in which one modifies the action to include
both the Riemannian measure and a non-Riemannian one, has proven to be able to
produce viable Universe evolution scenarios. In this article we consider two
special cases of the multi-measure model, in which we first decouple the two
kinetic te... | [
{
"created": "Thu, 5 Nov 2020 16:46:28 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Aug 2021 12:04:50 GMT",
"version": "v2"
},
{
"created": "Fri, 30 Dec 2022 17:15:29 GMT",
"version": "v3"
}
] | 2023-01-02 | [
[
"Staicova",
"Denitsa",
""
]
] | The multi-measure model (MMM), in which one modifies the action to include both the Riemannian measure and a non-Riemannian one, has proven to be able to produce viable Universe evolution scenarios. In this article we consider two special cases of the multi-measure model, in which we first decouple the two kinetic term... |
1711.09073 | Miriam Cabero | Miriam Cabero, Collin D. Capano, Ofek Fischer-Birnholtz, Badri
Krishnan, Alex B. Nielsen, Alexander H. Nitz and Christopher M. Biwer | Observational tests of the black hole area increase law | null | Phys. Rev. D 97, 124069 (2018) | 10.1103/PhysRevD.97.124069 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The black hole area theorem implies that when two black holes merge, the area
of the final black hole should be greater than the sum of the areas of the two
original black holes. We examine how this prediction can be tested with
gravitational-wave observations of binary black holes. By separately fitting
the early in... | [
{
"created": "Fri, 24 Nov 2017 18:40:32 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Jul 2018 11:44:07 GMT",
"version": "v2"
}
] | 2018-07-31 | [
[
"Cabero",
"Miriam",
""
],
[
"Capano",
"Collin D.",
""
],
[
"Fischer-Birnholtz",
"Ofek",
""
],
[
"Krishnan",
"Badri",
""
],
[
"Nielsen",
"Alex B.",
""
],
[
"Nitz",
"Alexander H.",
""
],
[
"Biwer",
"Christopher M... | The black hole area theorem implies that when two black holes merge, the area of the final black hole should be greater than the sum of the areas of the two original black holes. We examine how this prediction can be tested with gravitational-wave observations of binary black holes. By separately fitting the early insp... |
1905.05654 | Salvatore Capozziello | Micol Benetti, Salvatore Capozziello, and Leila Lobato Graef | Swampland conjecture in $f(R)$ gravity by the Noether Symmetry Approach | 11 pages, 1 figure, accepted for publication in Physical Review D | Phys. Rev. D 100, 084013 (2019) | 10.1103/PhysRevD.100.084013 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Swampland conjecture has been recently proposed to connect early time
cosmological models with the string landscape, and then to understand if
related scalar fields and potentials can come from some fundamental theory in
the high energy regime. In this paper, we discuss swampland criteria for $f(R)$
gravity consideri... | [
{
"created": "Tue, 14 May 2019 14:59:30 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Sep 2019 13:28:03 GMT",
"version": "v2"
}
] | 2020-11-09 | [
[
"Benetti",
"Micol",
""
],
[
"Capozziello",
"Salvatore",
""
],
[
"Graef",
"Leila Lobato",
""
]
] | Swampland conjecture has been recently proposed to connect early time cosmological models with the string landscape, and then to understand if related scalar fields and potentials can come from some fundamental theory in the high energy regime. In this paper, we discuss swampland criteria for $f(R)$ gravity considering... |
1104.3323 | Daniela Pugliese Dr | D. Pugliese and G. Montani | Stars in five dimensional Kaluza Klein gravity | 15 pages, 8 figures. To be published in EPJC | Eur.Phys.J.C71:1638,2011 | 10.1140/epjc/s10052-011-1638-x | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the five dimensional Kaluza Klein (KK) theory there is a well known class
of static and electromagnetic--free KK--equations characterized by a naked
singularity behavior, namely the Generalized Schwarzschild solution (GSS). We
present here a set of interior solutions of five dimensional KK--equations.
These equati... | [
{
"created": "Sun, 17 Apr 2011 16:09:54 GMT",
"version": "v1"
}
] | 2011-05-18 | [
[
"Pugliese",
"D.",
""
],
[
"Montani",
"G.",
""
]
] | In the five dimensional Kaluza Klein (KK) theory there is a well known class of static and electromagnetic--free KK--equations characterized by a naked singularity behavior, namely the Generalized Schwarzschild solution (GSS). We present here a set of interior solutions of five dimensional KK--equations. These equation... |
1907.04960 | Jeffrey Hazboun | Xavier Siemens and Jeffrey S. Hazboun and Paul T. Baker and Sarah
Burke-Spolaor and Dustin Madison and Chiara Mingarelli and Joseph Simon and
Tristan Smith | Physics Beyond the Standard Model With Pulsar Timing Arrays | null | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Pulsar timing arrays (PTAs) will enable the detection of nanohertz
gravitational waves (GWs) from a population of supermassive binary black holes
(SMBBHs) in the next $\sim 3-7$ years. In addition, PTAs provide a rare
opportunity to probe exotic physics. Potential sources of GWs in the nanohertz
band include, cosmic ... | [
{
"created": "Thu, 11 Jul 2019 00:27:22 GMT",
"version": "v1"
}
] | 2019-07-12 | [
[
"Siemens",
"Xavier",
""
],
[
"Hazboun",
"Jeffrey S.",
""
],
[
"Baker",
"Paul T.",
""
],
[
"Burke-Spolaor",
"Sarah",
""
],
[
"Madison",
"Dustin",
""
],
[
"Mingarelli",
"Chiara",
""
],
[
"Simon",
"Joseph",
""... | Pulsar timing arrays (PTAs) will enable the detection of nanohertz gravitational waves (GWs) from a population of supermassive binary black holes (SMBBHs) in the next $\sim 3-7$ years. In addition, PTAs provide a rare opportunity to probe exotic physics. Potential sources of GWs in the nanohertz band include, cosmic st... |
1502.01922 | Qiang Zhang | Qiang Zhang, Guang Yang, Qixiang Zou, Xinhe Meng, Keji Shen | Exploring the low redshift universe: two parametric models for effective
pressure | 11 pages, 24 figures | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Astrophysical observations have put unprecedentedly tight constraints on
cosmological theories. The $\Lambda$CDM model, mathematically simple and fits
observational data-sets well, is preferred for explaining the behavior of
universe. But many basic features of the dark sectors are still unknown, which
leaves rooms f... | [
{
"created": "Thu, 5 Feb 2015 15:02:23 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jun 2015 12:41:09 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Zhang",
"Qiang",
""
],
[
"Yang",
"Guang",
""
],
[
"Zou",
"Qixiang",
""
],
[
"Meng",
"Xinhe",
""
],
[
"Shen",
"Keji",
""
]
] | Astrophysical observations have put unprecedentedly tight constraints on cosmological theories. The $\Lambda$CDM model, mathematically simple and fits observational data-sets well, is preferred for explaining the behavior of universe. But many basic features of the dark sectors are still unknown, which leaves rooms for... |
1101.3264 | Muxin Han | Muxin Han, Carlo Rovelli | Spinfoam Fermions: PCT Symmetry, Dirac Determinant, and Correlation
Functions | 26 pages, 9 figures | Class. Quantum Grav. 30 (2013) 075007 | 10.1088/0264-9381/30/7/075007 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss fermion coupling in the framework of spinfoam quantum gravity. We
analyze the gravity-fermion spinfoam model and its fermion correlation
functions. We show that there is a spinfoam analog of PCT symmetry for the
fermion fields on spinfoam model, where a PCT theorem is proved for spinfoam
fermion correlatio... | [
{
"created": "Mon, 17 Jan 2011 16:55:05 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Mar 2013 11:01:00 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Han",
"Muxin",
""
],
[
"Rovelli",
"Carlo",
""
]
] | We discuss fermion coupling in the framework of spinfoam quantum gravity. We analyze the gravity-fermion spinfoam model and its fermion correlation functions. We show that there is a spinfoam analog of PCT symmetry for the fermion fields on spinfoam model, where a PCT theorem is proved for spinfoam fermion correlation ... |
2308.06727 | Abhishek Mathur | Abhishek Mathur | Quantum Fields from Causal Order | PhD thesis 2023, Raman Research Institute, submitted to Jawaharlal
Nehru University | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study different aspects of observer independent formulation of quantum
field theory (QFT) in curved spacetime background. This thesis is broadly
divided into two parts, in the first part we study an observer independent
scalar field vacuum, called as the Sorkin-Johnston (SJ) vacuum for a small mass
scalar field in... | [
{
"created": "Sun, 13 Aug 2023 09:07:05 GMT",
"version": "v1"
}
] | 2023-08-15 | [
[
"Mathur",
"Abhishek",
""
]
] | We study different aspects of observer independent formulation of quantum field theory (QFT) in curved spacetime background. This thesis is broadly divided into two parts, in the first part we study an observer independent scalar field vacuum, called as the Sorkin-Johnston (SJ) vacuum for a small mass scalar field in a... |
2407.04853 | Carsten Gundlach | Carsten Gundlach | The two-body problem in 2+1 spacetime dimensions with negative
cosmological constant: two point particles | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We work towards the general solution of the two-body problem in
2+1-dimensional general relativity with a negative cosmological constant. The
BTZ solutions corresponding to black holes, point particles and overspinning
particles can be considered either as objects in their own right, or as the
exterior solution of co... | [
{
"created": "Fri, 5 Jul 2024 20:21:20 GMT",
"version": "v1"
}
] | 2024-07-09 | [
[
"Gundlach",
"Carsten",
""
]
] | We work towards the general solution of the two-body problem in 2+1-dimensional general relativity with a negative cosmological constant. The BTZ solutions corresponding to black holes, point particles and overspinning particles can be considered either as objects in their own right, or as the exterior solution of comp... |
1304.2203 | Alejandro Cabo | Alejandro Cabo Montes de Oca and Jorge Casti\~neiras | On radiation reaction and the Abraham-Lorentz-Dirac equation | 6 pages, 1 figure | null | null | null | gr-qc physics.acc-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is underlined that the Lienard-Wiechert solutions indicate that after the
external force is instantly removed from a small charged particle, the field in
its close neighborhood becomes a Lorentz boosted Coulomb field. It suggests
that the force of the self-field on the particle should instantaneously vanish
after ... | [
{
"created": "Mon, 8 Apr 2013 13:36:10 GMT",
"version": "v1"
}
] | 2013-09-13 | [
[
"de Oca",
"Alejandro Cabo Montes",
""
],
[
"Castiñeiras",
"Jorge",
""
]
] | It is underlined that the Lienard-Wiechert solutions indicate that after the external force is instantly removed from a small charged particle, the field in its close neighborhood becomes a Lorentz boosted Coulomb field. It suggests that the force of the self-field on the particle should instantaneously vanish after a ... |
1701.03718 | Paul Klinger | Piotr T. Chru\'sciel, Erwann Delay (LMA), Paul Klinger | Non-singular spacetimes with a negative cosmological constant: III.
Stationary solutions with matter fields | 27 pages, v2: journal accepted version | Phys. Rev. D 95, 104039 (2017) | 10.1103/PhysRevD.95.104039 | UWThPh-2016-30 | gr-qc hep-th math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Generalising the results in arXiv:1612.00281, we construct
infinite-dimensional families of non-singular stationary space times, solutions
of Yang-Mills-Higgs-Einstein-Maxwell-Chern-Simons-dilaton-scalar field
equations with a negative cosmological constant. The families include an
infinite-dimensional family of solu... | [
{
"created": "Fri, 13 Jan 2017 16:45:10 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Apr 2017 16:02:08 GMT",
"version": "v2"
}
] | 2017-06-07 | [
[
"Chruściel",
"Piotr T.",
"",
"LMA"
],
[
"Delay",
"Erwann",
"",
"LMA"
],
[
"Klinger",
"Paul",
""
]
] | Generalising the results in arXiv:1612.00281, we construct infinite-dimensional families of non-singular stationary space times, solutions of Yang-Mills-Higgs-Einstein-Maxwell-Chern-Simons-dilaton-scalar field equations with a negative cosmological constant. The families include an infinite-dimensional family of soluti... |
1912.07094 | Matthew J. Lake Dr | Matthew J. Lake, Marek Miller and Shi-Dong Liang | Generalised uncertainty relations for angular momentum and spin in
quantum geometry | 28 pages of main text, plus 12 additional pages split between 4
appendices and 3 pages of references. No figures. Invited contribution to the
Universe special issue "Rotation Effects in Relativity", Matteo Ruggiero ed.
Published version | Universe 6 (2020) 4, 56 | 10.3390/universe6040056 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive generalised uncertainty relations (GURs) for angular momentum and
spin in the smeared-space model of quantum geometry. The model implements a
minimum length and a minimum linear momentum, and recovers both the generalised
uncertainty principle (GUP) and the extended uncertainty principle (EUP) within
a sing... | [
{
"created": "Sun, 15 Dec 2019 19:33:21 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Mar 2020 18:27:42 GMT",
"version": "v2"
},
{
"created": "Tue, 26 May 2020 13:35:45 GMT",
"version": "v3"
}
] | 2020-05-27 | [
[
"Lake",
"Matthew J.",
""
],
[
"Miller",
"Marek",
""
],
[
"Liang",
"Shi-Dong",
""
]
] | We derive generalised uncertainty relations (GURs) for angular momentum and spin in the smeared-space model of quantum geometry. The model implements a minimum length and a minimum linear momentum, and recovers both the generalised uncertainty principle (GUP) and the extended uncertainty principle (EUP) within a single... |
2010.05278 | Muhsin Aljaf | Muhsin Aljaf, Daniele Gregoris, Martiros Khurshudyan | Assessing the foundation and applicability of some dark energy fluid
models in the Dirac-Born-Infeld framework | Matches the published version; 24 pages and 8 figures | International Journal of Modern Physics A (2022) | 10.1142/S0217751X22502116 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we will deepen the understanding of some fluid models proposed
by other authors for the description of dark energy. Specifically, we will show
that the so-called (Modified) Berthelot fluid is the hydrodynamic realization
of the free Dirac-Born-Infeld theory and that the Dieterici fluid admits a
non-rel... | [
{
"created": "Sun, 11 Oct 2020 16:22:44 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Dec 2021 14:21:38 GMT",
"version": "v2"
},
{
"created": "Sat, 28 Jan 2023 04:26:43 GMT",
"version": "v3"
}
] | 2023-01-31 | [
[
"Aljaf",
"Muhsin",
""
],
[
"Gregoris",
"Daniele",
""
],
[
"Khurshudyan",
"Martiros",
""
]
] | In this paper, we will deepen the understanding of some fluid models proposed by other authors for the description of dark energy. Specifically, we will show that the so-called (Modified) Berthelot fluid is the hydrodynamic realization of the free Dirac-Born-Infeld theory and that the Dieterici fluid admits a non-relat... |
gr-qc/0101059 | Roy Maartens | Roy Maartens (Portsmouth) | Geometry and dynamics of the brane-world | Minor corrections to Eqs. 14, 42, 64, and reference updates | null | 10.1142/9789812810021_0008 | null | gr-qc astro-ph hep-th | null | Recent developments in string theory have led to 5-dimensional warped
spacetime models in which standard-model fields are confined to a 3-brane (the
observed universe), while gravity can propagate in the fifth dimension. Gravity
is localized near the brane at low energies, even if the extra dimension is
noncompact. A... | [
{
"created": "Tue, 16 Jan 2001 14:38:39 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Apr 2001 12:59:16 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"Maartens",
"Roy",
"",
"Portsmouth"
]
] | Recent developments in string theory have led to 5-dimensional warped spacetime models in which standard-model fields are confined to a 3-brane (the observed universe), while gravity can propagate in the fifth dimension. Gravity is localized near the brane at low energies, even if the extra dimension is noncompact. A r... |
1303.0850 | Norman Metzner | Norman Metzner | Twistor Theory of Higher-Dimensional Black Holes - Part I: Theory | 26 pages, 7 figures | Class. Quantum Grav. 30 (2013) 095001 | 10.1088/0264-9381/30/9/095001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The correspondence between stationary, axisymmetric, asymptotically flat
space-times and bundles over a reduced twistor space has been established in
four dimensions. The main impediment for an application of this correspondence
to examples in higher dimensions has been the lack of a higher-dimensional
equivalent of ... | [
{
"created": "Mon, 4 Mar 2013 21:03:47 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Metzner",
"Norman",
""
]
] | The correspondence between stationary, axisymmetric, asymptotically flat space-times and bundles over a reduced twistor space has been established in four dimensions. The main impediment for an application of this correspondence to examples in higher dimensions has been the lack of a higher-dimensional equivalent of th... |
gr-qc/9608042 | Karen Brewster | Abhay Ashtekar, Jiri Bicak, Bernd G. Schmidt | Asymptotic Structure of Symmetry Reduced General Relativity | 39 Pages, REVTEX, CGPG-96/5-1 | Phys.Rev.D55:669-686,1997 | 10.1103/PhysRevD.55.669 | null | gr-qc | null | Gravitational waves with a space-translation Killing field are considered. In
this case, the 4-dimensional Einstein vacuum equations are equivalent to the
3-dimensional Einstein equations with certain matter sources. This interplay
between 4- and 3- dimensional general relativity can be exploited effectively
to analy... | [
{
"created": "Fri, 16 Aug 1996 18:00:09 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Ashtekar",
"Abhay",
""
],
[
"Bicak",
"Jiri",
""
],
[
"Schmidt",
"Bernd G.",
""
]
] | Gravitational waves with a space-translation Killing field are considered. In this case, the 4-dimensional Einstein vacuum equations are equivalent to the 3-dimensional Einstein equations with certain matter sources. This interplay between 4- and 3- dimensional general relativity can be exploited effectively to analyze... |
0709.3559 | Maria Babiuc | M. C. Babiuc, S. Husa, D. Alic, I. Hinder, C. Lechner, E. Schnetter,
B. Szilagyi, Y. Zlochower, N. Dorband, D. Pollney, J. Winicour | Implementation of standard testbeds for numerical relativity | Corrected version | Class.Quant.Grav.25:125012,2008 | 10.1088/0264-9381/25/12/125012 | null | gr-qc | null | We discuss results that have been obtained from the implementation of the
initial round of testbeds for numerical relativity which was proposed in the
first paper of the Apples with Apples Alliance. We present benchmark results
for various codes which provide templates for analyzing the testbeds and to
draw conclusio... | [
{
"created": "Sat, 22 Sep 2007 03:41:21 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Apr 2008 20:44:34 GMT",
"version": "v2"
},
{
"created": "Wed, 14 May 2008 20:01:44 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Babiuc",
"M. C.",
""
],
[
"Husa",
"S.",
""
],
[
"Alic",
"D.",
""
],
[
"Hinder",
"I.",
""
],
[
"Lechner",
"C.",
""
],
[
"Schnetter",
"E.",
""
],
[
"Szilagyi",
"B.",
""
],
[
"Zlochower",
"Y.",
... | We discuss results that have been obtained from the implementation of the initial round of testbeds for numerical relativity which was proposed in the first paper of the Apples with Apples Alliance. We present benchmark results for various codes which provide templates for analyzing the testbeds and to draw conclusions... |
1910.07841 | Paolo Pani | Sayak Datta, Richard Brito, Sukanta Bose, Paolo Pani, Scott A. Hughes | Tidal heating as a discriminator for horizons in extreme mass ratio
inspirals | v2: 8+4 pages, 5 figures, one new plot. Version to appear in PRD | Phys. Rev. D 101, 044004 (2020) | 10.1103/PhysRevD.101.044004 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The defining feature of a classical black hole is being a perfect absorber.
Any evidence showing otherwise would indicate a departure from the standard
black-hole picture. Energy and angular momentum absorption by the horizon of a
black hole is responsible for tidal heating in a binary. This effect is
particularly im... | [
{
"created": "Thu, 17 Oct 2019 11:51:30 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jan 2020 15:48:51 GMT",
"version": "v2"
}
] | 2020-02-12 | [
[
"Datta",
"Sayak",
""
],
[
"Brito",
"Richard",
""
],
[
"Bose",
"Sukanta",
""
],
[
"Pani",
"Paolo",
""
],
[
"Hughes",
"Scott A.",
""
]
] | The defining feature of a classical black hole is being a perfect absorber. Any evidence showing otherwise would indicate a departure from the standard black-hole picture. Energy and angular momentum absorption by the horizon of a black hole is responsible for tidal heating in a binary. This effect is particularly impo... |
gr-qc/0306008 | Martin Bojowald | Martin Bojowald and Hugo A. Morales-Tecotl | Cosmological applications of loop quantum gravity | 42 pages, 4 figures, written for the proceedings of the Fifth Mexican
School (DGFM): The Early Universe and Observational Cosmology | Lect.Notes Phys.646:421-462,2004 | 10.1007/b97189 | CGPG-03/6-1 | gr-qc astro-ph hep-th | null | After a brief introduction to classical and quantum gravity we discuss
applications of loop quantum gravity in the cosmological realm. This includes
the basic formalism and recent results of loop quantum cosmology, and a
computation of modified dispersion relations for quantum gravity phenomenology.
The presentation ... | [
{
"created": "Mon, 2 Jun 2003 20:01:43 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Bojowald",
"Martin",
""
],
[
"Morales-Tecotl",
"Hugo A.",
""
]
] | After a brief introduction to classical and quantum gravity we discuss applications of loop quantum gravity in the cosmological realm. This includes the basic formalism and recent results of loop quantum cosmology, and a computation of modified dispersion relations for quantum gravity phenomenology. The presentation is... |
2207.14305 | Marco Astorino | Marco Astorino | Removal of conical singularities from rotating C-metrics and dual CFT
entropy | 18 pages, no figures | JHEP 10 (2022) 074 | 10.1007/JHEP10(2022)074 | LIFT-2-2.22 | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We show how to remove from the rotating C-metric spacetime, which describes
accelerating Kerr black holes, both conical singularities. This can be done by
embedding the metric into a swirling gravitational universe, through a proper
Ehlers transformation. The spin-spin interaction between the external
rotational back... | [
{
"created": "Thu, 28 Jul 2022 18:00:00 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Aug 2023 10:51:37 GMT",
"version": "v2"
}
] | 2023-08-22 | [
[
"Astorino",
"Marco",
""
]
] | We show how to remove from the rotating C-metric spacetime, which describes accelerating Kerr black holes, both conical singularities. This can be done by embedding the metric into a swirling gravitational universe, through a proper Ehlers transformation. The spin-spin interaction between the external rotational backgr... |
gr-qc/9603057 | Valter Moretti | V. Moretti (Dept. Phys. Univ. Trento (Italy) and INFN) | Canonical Quantization of Photons in a Rindler Wedge | 32 pages, latex, no figures, revised version, no changes in the
physical results, to be published in J. Math. Phys | J.Math.Phys.38:2922-2953,1997 | 10.1063/1.532026 | UTF 376 | gr-qc hep-th | null | Photons and thermal photons are studied in the Rindler Wedge employing
Feynman's gauge and canonical quantization. A Gupta-Bleuler-like formalism is
explicitly implemented. Non thermal Wightman functions and related (Euclidean
and Lorentzian) Green functions are explicitly calculated and their complex
time analytic s... | [
{
"created": "Thu, 28 Mar 1996 16:03:38 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Mar 1996 15:38:37 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Apr 1996 10:48:45 GMT",
"version": "v3"
},
{
"created": "Fri, 13 Dec 1996 18:57:37 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Moretti",
"V.",
"",
"Dept. Phys. Univ. Trento"
]
] | Photons and thermal photons are studied in the Rindler Wedge employing Feynman's gauge and canonical quantization. A Gupta-Bleuler-like formalism is explicitly implemented. Non thermal Wightman functions and related (Euclidean and Lorentzian) Green functions are explicitly calculated and their complex time analytic str... |
gr-qc/9611009 | Carlos O. Lousto | Carlos O. Lousto (Univ. Utah) and Francisco D. Mazzitelli (Univ.
Buenos Aires) | An exact self-consistent gravitational shock wave in semiclassical
gravity | 13 pages, REVTEX, 4 PS figures. Revised version contains a derivation
of the solution compatible with its distributional character. The final
results, though, are the same | Phys.Rev.D56:3471-3477,1997 | 10.1103/PhysRevD.56.3471 | null | gr-qc hep-th | null | We find a self-consistent pp-gravitational shock wave solution to the
semiclassical Einstein equations resulting from the $1/N$ approach to the
effective action. We model the renormalized matter stress-energy-momentum
tensor by $N$ massless scalar fields in the Minkowski vacuum plus a classical
particle. We show that... | [
{
"created": "Tue, 5 Nov 1996 01:35:42 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Jul 1997 22:55:03 GMT",
"version": "v2"
}
] | 2011-09-09 | [
[
"Lousto",
"Carlos O.",
"",
"Univ. Utah"
],
[
"Mazzitelli",
"Francisco D.",
"",
"Univ.\n Buenos Aires"
]
] | We find a self-consistent pp-gravitational shock wave solution to the semiclassical Einstein equations resulting from the $1/N$ approach to the effective action. We model the renormalized matter stress-energy-momentum tensor by $N$ massless scalar fields in the Minkowski vacuum plus a classical particle. We show that q... |
gr-qc/0702093 | Bianca Dittrich | Bianca Dittrich, Johannes Tambornino | Gauge invariant perturbations around symmetry reduced sectors of general
relativity: applications to cosmology | 39 pages, 1 figure | Class.Quant.Grav.24:4543-4586,2007 | 10.1088/0264-9381/24/18/001 | null | gr-qc astro-ph hep-th | null | We develop a gauge invariant canonical perturbation scheme for perturbations
around symmetry reduced sectors in generally covariant theories, such as
general relativity. The central objects of investigation are gauge invariant
observables which encode the dynamics of the system. We apply this scheme to
perturbations ... | [
{
"created": "Thu, 15 Feb 2007 20:18:55 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Dittrich",
"Bianca",
""
],
[
"Tambornino",
"Johannes",
""
]
] | We develop a gauge invariant canonical perturbation scheme for perturbations around symmetry reduced sectors in generally covariant theories, such as general relativity. The central objects of investigation are gauge invariant observables which encode the dynamics of the system. We apply this scheme to perturbations ar... |
1811.03152 | Behnam Pourhassan | B. Pourhassan, K. Kokabi, Z. Sabery | Higher order corrected thermodynamics and statistics of
Kerr-Newman-Godel black hole | 16 pages, 8 Figures | Annals of Physics 399 (2018) 181 | 10.1016/j.aop.2018.10.011 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we consider the rotating charged G\"{o}del black hole and
study the effect of the higher order corrections of the entropy on the
thermodynamics and statistics quantities of the Kerr-Newman-G\"{o}del black
hole. The leading order correction is logarithmic while higher-order terms are
proportional to the... | [
{
"created": "Sat, 3 Nov 2018 11:46:40 GMT",
"version": "v1"
}
] | 2018-11-09 | [
[
"Pourhassan",
"B.",
""
],
[
"Kokabi",
"K.",
""
],
[
"Sabery",
"Z.",
""
]
] | In this paper, we consider the rotating charged G\"{o}del black hole and study the effect of the higher order corrections of the entropy on the thermodynamics and statistics quantities of the Kerr-Newman-G\"{o}del black hole. The leading order correction is logarithmic while higher-order terms are proportional to the i... |
gr-qc/9909095 | Fred Cooperstock I. | F.I. Cooperstock | Does a dynamical system lose energy by emitting gravitational waves? | Published in Modern Physics Letters A vol 14, no 23, 1531, 1999 Full
text available in the journal | Mod.Phys.Lett. A14 (1999) 1531 | 10.1142/S0217732399001620 | null | gr-qc | null | We note that Eddington's radiation damping calculation of a spinning rod
fails to account for the complete mass integral as given by Tolman. The missing
stress contributions precisely cancel the standard rate given by the
'quadrupole formula'. This indicates that while the usual 'kinetic' term can
properly account fo... | [
{
"created": "Thu, 30 Sep 1999 22:51:49 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Cooperstock",
"F. I.",
""
]
] | We note that Eddington's radiation damping calculation of a spinning rod fails to account for the complete mass integral as given by Tolman. The missing stress contributions precisely cancel the standard rate given by the 'quadrupole formula'. This indicates that while the usual 'kinetic' term can properly account for ... |
gr-qc/0508123 | Abraham Harte | Abraham I. Harte | Self-forces on extended bodies in electrodynamics | 30 pages; significantly improved presentation; accepted for
publication in Phys. Rev. D | Phys.Rev.D73:065006,2006 | 10.1103/PhysRevD.73.065006 | null | gr-qc | null | In this paper, we study the bulk motion of a classical extended charge in
flat spacetime. A formalism developed by W. G. Dixon is used to determine how
the details of such a particle's internal structure influence its equations of
motion. We place essentially no restrictions (other than boundedness) on the
shape of t... | [
{
"created": "Tue, 30 Aug 2005 08:51:34 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Jan 2006 04:44:44 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Harte",
"Abraham I.",
""
]
] | In this paper, we study the bulk motion of a classical extended charge in flat spacetime. A formalism developed by W. G. Dixon is used to determine how the details of such a particle's internal structure influence its equations of motion. We place essentially no restrictions (other than boundedness) on the shape of the... |
gr-qc/0101058 | J. Brian Pitts | J. Brian Pitts (The University of Texas at Austin) and W. C. Schieve
(The University of Texas at Austin) | Slightly Bimetric Gravitation | Minor editing, missing definition supplied, minor clarifications on
spinors of Ogievetskii and Polubarinov and on conformal flatness of
Robertson-Walker models | Gen.Rel.Grav. 33 (2001) 1319-1350 | 10.1023/A:1012005508094 | null | gr-qc hep-th | null | The inclusion of a flat metric tensor in gravitation permits the formulation
of a gravitational stress-energy tensor and the formal derivation of general
relativity from a linear theory in flat spacetime. Building on the works of
Kraichnan and Deser, we present such a derivation using universal coupling and
gauge inv... | [
{
"created": "Tue, 16 Jan 2001 06:55:52 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jan 2001 05:30:24 GMT",
"version": "v2"
},
{
"created": "Thu, 16 Aug 2007 15:04:06 GMT",
"version": "v3"
}
] | 2015-06-25 | [
[
"Pitts",
"J. Brian",
"",
"The University of Texas at Austin"
],
[
"Schieve",
"W. C.",
"",
"The University of Texas at Austin"
]
] | The inclusion of a flat metric tensor in gravitation permits the formulation of a gravitational stress-energy tensor and the formal derivation of general relativity from a linear theory in flat spacetime. Building on the works of Kraichnan and Deser, we present such a derivation using universal coupling and gauge invar... |
0811.4269 | Khedmat Atazadeh | K. Atazadeh, A. Khaleghi, H. R. Sepangi, Y. Tavakoli | Energy conditions in f(R) gravity and Brans-Dicke theories | 9 pages, 1 figure, to appear in IJMPD | Int.J.Mod.Phys.D18:1101-1111,2009 | 10.1142/S0218271809014972 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The equivalence between f(R) gravity and scalar-tensor theories is invoked to
study the null, strong, weak and dominant energy conditions in Brans-Dicke
theory. We consider the validity of the energy conditions in Brans-Dicke theory
by invoking the energy conditions derived from a generic f(R) theory. The
parameters ... | [
{
"created": "Wed, 26 Nov 2008 10:53:50 GMT",
"version": "v1"
}
] | 2009-08-25 | [
[
"Atazadeh",
"K.",
""
],
[
"Khaleghi",
"A.",
""
],
[
"Sepangi",
"H. R.",
""
],
[
"Tavakoli",
"Y.",
""
]
] | The equivalence between f(R) gravity and scalar-tensor theories is invoked to study the null, strong, weak and dominant energy conditions in Brans-Dicke theory. We consider the validity of the energy conditions in Brans-Dicke theory by invoking the energy conditions derived from a generic f(R) theory. The parameters in... |
gr-qc/9301007 | Yoshiaki Ohkuwa | Yoshiaki Ohkuwa | Decoherence Functional and Probability Interpretation | 9 pages, UCSBTH-92-40 and MMC-M-2 | Phys.Rev. D48 (1993) 1781-1784 | 10.1103/PhysRevD.48.1781 | null | gr-qc | null | We confirm that the diagonal elements of the Gell-Mann and Hartle's
decoherence decoherence functional are equal to the relative frequencies of the
results of many identical experiments, when a set of alternative histories
decoheres. We consider both cases of the pure and mixed initial states.
| [
{
"created": "Sat, 9 Jan 1993 20:32:38 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Ohkuwa",
"Yoshiaki",
""
]
] | We confirm that the diagonal elements of the Gell-Mann and Hartle's decoherence decoherence functional are equal to the relative frequencies of the results of many identical experiments, when a set of alternative histories decoheres. We consider both cases of the pure and mixed initial states. |
0907.2839 | Gil Jannes | Gil Jannes | Emergent gravity: the BEC paradigm | PhD thesis; 144 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study selected aspects of quantum gravity phenomenology inspired by the
gravitational analogy in Bose--Einstein condensates (BECs). We first review the
basic ideas and formalism of analogue gravity in BECs, with particular emphasis
on the possibility of simulating black holes. The non-relativistic,
'superluminal' ... | [
{
"created": "Thu, 16 Jul 2009 13:41:33 GMT",
"version": "v1"
}
] | 2009-07-17 | [
[
"Jannes",
"Gil",
""
]
] | We study selected aspects of quantum gravity phenomenology inspired by the gravitational analogy in Bose--Einstein condensates (BECs). We first review the basic ideas and formalism of analogue gravity in BECs, with particular emphasis on the possibility of simulating black holes. The non-relativistic, 'superluminal' mo... |
1910.00416 | Mark D. Roberts | Mark D. Roberts | The Lanczos Potential for Bianchi Spacetime | 19 pages, 79 equations, high equation to text ratio | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The form and application of the Lanczos potential for Bianchi spacetime are
studied. The Lanczos potential is found in some specific cases then the general
case studied. It leads to two coupled first order partial differential
equations which although they so far have not been solved in general can be
solved for many... | [
{
"created": "Sat, 28 Sep 2019 13:16:11 GMT",
"version": "v1"
}
] | 2019-10-02 | [
[
"Roberts",
"Mark D.",
""
]
] | The form and application of the Lanczos potential for Bianchi spacetime are studied. The Lanczos potential is found in some specific cases then the general case studied. It leads to two coupled first order partial differential equations which although they so far have not been solved in general can be solved for many c... |
2010.14527 | LSC P&P Committee | R. Abbott, T. D. Abbott, S. Abraham, F. Acernese, K. Ackley, A. Adams,
C. Adams, R. X. Adhikari, V. B. Adya, C. Affeldt, M. Agathos, K. Agatsuma, N.
Aggarwal, O. D. Aguiar, L. Aiello, A. Ain, P. Ajith, S. Akcay, G. Allen, A.
Allocca, P. A. Altin, A. Amato, S. Anand, A. Ananyeva, S. B. Anderson, W. G.
Anderson, ... | GWTC-2: Compact Binary Coalescences Observed by LIGO and Virgo During
the First Half of the Third Observing Run | This version updates with minor revisions to typographical errors. We
would also like to call attention to the updated parameter estimation samples
data release here: https://dcc.ligo.org/LIGO-P2000223/public | Phys. Rev. X 11, 021053 (2021) | 10.1103/PhysRevX.11.021053 | P2000061 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on gravitational wave discoveries from compact binary coalescences
detected by Advanced LIGO and Advanced Virgo in the first half of the third
observing run (O3a) between 1 April 2019 15:00 UTC and 1 October 2019 15:00. By
imposing a false-alarm-rate threshold of two per year in each of the four
search pipe... | [
{
"created": "Tue, 27 Oct 2020 18:01:31 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Feb 2021 16:31:07 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Mar 2021 18:36:29 GMT",
"version": "v3"
}
] | 2021-06-15 | [
[
"Abbott",
"R.",
""
],
[
"Abbott",
"T. D.",
""
],
[
"Abraham",
"S.",
""
],
[
"Acernese",
"F.",
""
],
[
"Ackley",
"K.",
""
],
[
"Adams",
"A.",
""
],
[
"Adams",
"C.",
""
],
[
"Adhikari",
"R. X.",
... | We report on gravitational wave discoveries from compact binary coalescences detected by Advanced LIGO and Advanced Virgo in the first half of the third observing run (O3a) between 1 April 2019 15:00 UTC and 1 October 2019 15:00. By imposing a false-alarm-rate threshold of two per year in each of the four search pipeli... |
gr-qc/0502075 | Fabrizio Canfora | F. Canfora, G. Vilasi | PP-waves, Israel's Matching conditions, Brane-world scenarios and BPS
states in gravity | 16 pages, no figures. Accepted for pubblication on Classical and
Quantum Gravity | Class.Quant.Grav.22:1193-1205,2005 | 10.1088/0264-9381/22/7/001 | null | gr-qc hep-th | null | The matching between two 4-dimensional PP-waves is discussed by using
Israel's matching conditions. Physical consequences on the dynamics of (cosmic)
strings are analyzed. The extension to space-time of arbitrary dimension is
discussed and some interesting features related to the brane world scenario,
BPS states in g... | [
{
"created": "Wed, 16 Feb 2005 08:07:14 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Canfora",
"F.",
""
],
[
"Vilasi",
"G.",
""
]
] | The matching between two 4-dimensional PP-waves is discussed by using Israel's matching conditions. Physical consequences on the dynamics of (cosmic) strings are analyzed. The extension to space-time of arbitrary dimension is discussed and some interesting features related to the brane world scenario, BPS states in gra... |
gr-qc/0408061 | Volodymyr Pelykh | V. Pelykh | Knot points of double--covariant system of elliptic equations and
preferred frames in general relativity | 10 pages | J.Phys.A35:8135-8144,2002 | 10.1088/0305-4470/35/38/313 | null | gr-qc | null | The elliptic system of equations, which is general-covariant and locally
SU(2)-covariant, is investigated. The new condition of the Dirichlet problem
solvability and the condition of zeros absence for solutions are obtained for
this system, which contains in particular case the Sen-Witten equation. On this
basis it i... | [
{
"created": "Wed, 18 Aug 2004 13:40:21 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Pelykh",
"V.",
""
]
] | The elliptic system of equations, which is general-covariant and locally SU(2)-covariant, is investigated. The new condition of the Dirichlet problem solvability and the condition of zeros absence for solutions are obtained for this system, which contains in particular case the Sen-Witten equation. On this basis it is ... |
gr-qc/0005121 | Robert D. Klauber | Robert D. Klauber | Non-time-orthogonal Reference Frames in the Theory of Relativity | 11 pages including 4 figs, appendix, references, and title page
submitted for publication | null | null | null | gr-qc | null | A simple, though rarely considered, thought experiment on relativistic
rotation is described in which internal inconsistencies in the theory of
relativity seem to arise. These apparent inconsistencies are resolved by
appropriate insight into the nature, and unique properties, of the
non-time-orthogonal rotating frame... | [
{
"created": "Sun, 28 May 2000 20:01:16 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Klauber",
"Robert D.",
""
]
] | A simple, though rarely considered, thought experiment on relativistic rotation is described in which internal inconsistencies in the theory of relativity seem to arise. These apparent inconsistencies are resolved by appropriate insight into the nature, and unique properties, of the non-time-orthogonal rotating frame. ... |
2007.04995 | William C. C. Lima | William C. C. Lima | Graviton backreaction on the local cosmological expansion in slow-roll
inflation | 41 pages. Reformulated version, with some intermediary steps moved to
the appendix, some sections made more concise and improved discussions.
Results unchanged; matches published version | Class. Quantum Grav. 38, 135015 (2021) | 10.1088/1361-6382/abfaeb | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the graviton one-loop correction to the expectation value of the
local expansion rate in slow-roll inflation, with both slow-roll parameters
finite. The calculation is based on a recent method to explicitly construct
gauge-invariant observables in perturbative quantum gravity at all orders in
perturbation ... | [
{
"created": "Thu, 9 Jul 2020 18:00:01 GMT",
"version": "v1"
},
{
"created": "Sun, 19 Jul 2020 19:01:38 GMT",
"version": "v2"
},
{
"created": "Fri, 16 Oct 2020 15:06:35 GMT",
"version": "v3"
},
{
"created": "Thu, 3 Jun 2021 13:47:30 GMT",
"version": "v4"
}
] | 2021-06-04 | [
[
"Lima",
"William C. C.",
""
]
] | We compute the graviton one-loop correction to the expectation value of the local expansion rate in slow-roll inflation, with both slow-roll parameters finite. The calculation is based on a recent method to explicitly construct gauge-invariant observables in perturbative quantum gravity at all orders in perturbation th... |
gr-qc/0502094 | Giovanni Montani | Emanuele Alesci and Giovanni Montani | Can be gravitational waves markers for an extra-dimension? | 5 pages, two figure, to appear on Int. Journ. Mod. Phys. D | Int.J.Mod.Phys. D14 (2005) 923-932 | 10.1142/S0218271805006717 | null | gr-qc | null | The main issue of the present letter is to fix specific features (which turn
out being independent of extradimension size) of gravitational waves generated
before a dimensional compactification process. Valuable is the possibility to
detect our prediction from gravitational wave experiment without high energy
laborat... | [
{
"created": "Tue, 22 Feb 2005 15:24:58 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Alesci",
"Emanuele",
""
],
[
"Montani",
"Giovanni",
""
]
] | The main issue of the present letter is to fix specific features (which turn out being independent of extradimension size) of gravitational waves generated before a dimensional compactification process. Valuable is the possibility to detect our prediction from gravitational wave experiment without high energy laborator... |
gr-qc/0609091 | Thomas Sotiriou | Theocharis A. Apostolatos, Thomas P. Sotiriou | Measuring mass moments and electromagnetic moments of a massive,
axisymmetric body, through gravitational waves | Talk given by T. A. A. at Recent Advances in Astronomy and
Astrophysics, Lixourion, Kefallinia island, Greece, 8-11 Sep 2005 | AIP Conf. Proc. 848, 677 (2006) | 10.1063/1.2348046 | null | gr-qc | null | The electrovacuum around a rotating massive body with electric charge density
is described by its multipole moments (mass moments, mass-current moments,
electric moments, and magnetic moments). A small uncharged test particle
orbiting around such a body moves on geodesics if gravitational radiation is
ignored. The wa... | [
{
"created": "Thu, 21 Sep 2006 13:07:17 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Apostolatos",
"Theocharis A.",
""
],
[
"Sotiriou",
"Thomas P.",
""
]
] | The electrovacuum around a rotating massive body with electric charge density is described by its multipole moments (mass moments, mass-current moments, electric moments, and magnetic moments). A small uncharged test particle orbiting around such a body moves on geodesics if gravitational radiation is ignored. The wave... |
2105.10638 | Ayan Banerjee | Grigoris Panotopoulos, Takol Tangphati and Ayan Banerjee | Electrically charged compact stars with an interacting quark equation of
state | 8 pages, 3 figures | null | 10.1016/j.cjph.2021.10.027 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the properties of non-rotating, electrically charged strange
quark stars in four-dimensional Einstein-Maxwell theory. For quark matter we
adopt the well-motivated quantum chromodynamics (QCD) equation-of-state, while
for the charge density we assume it is proportional to the mass density. The
system of... | [
{
"created": "Sat, 22 May 2021 04:51:38 GMT",
"version": "v1"
}
] | 2022-05-04 | [
[
"Panotopoulos",
"Grigoris",
""
],
[
"Tangphati",
"Takol",
""
],
[
"Banerjee",
"Ayan",
""
]
] | We investigate the properties of non-rotating, electrically charged strange quark stars in four-dimensional Einstein-Maxwell theory. For quark matter we adopt the well-motivated quantum chromodynamics (QCD) equation-of-state, while for the charge density we assume it is proportional to the mass density. The system of c... |
2206.05481 | B. S. Ratanpal | Ankita Jangid, B. S. Ratanpal, K Venkataratnam Kamma | Anisotropic Compact Star Model on Finch-Skea Spacetime | 9 figures, 1 table and 7 pages | null | 10.1134/S0202289323020068 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this study, we demonstrate a new anisotropic solution to the Einstein
field equations in Finch-Skea spacetime. The physical features of stellar
configuration are studied in previous investigations. We create a model that
meets all physical plausibility conditions for a variety of stars and plot
graphs for \textbf{... | [
{
"created": "Sat, 11 Jun 2022 09:54:08 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Sep 2022 06:29:54 GMT",
"version": "v2"
}
] | 2023-06-28 | [
[
"Jangid",
"Ankita",
""
],
[
"Ratanpal",
"B. S.",
""
],
[
"Kamma",
"K Venkataratnam",
""
]
] | In this study, we demonstrate a new anisotropic solution to the Einstein field equations in Finch-Skea spacetime. The physical features of stellar configuration are studied in previous investigations. We create a model that meets all physical plausibility conditions for a variety of stars and plot graphs for \textbf{4U... |
1506.03280 | Krzysztof A. Meissner | Krzysztof A. Meissner and Pawel Nurowski | Conformal transformations and the beginning of the Universe | 4 pages | Phys. Rev. D 95, 084016 (2017) | 10.1103/PhysRevD.95.084016 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that two consecutive Universes with positive cosmological constants
filled with perfect fluids and conformal to the positive-spatial-curvature FLRW
metric by an analytic conformal transformation have the following features
implied by the Einstein equations: a) the fluids can only belong to 4 classes
(radiatio... | [
{
"created": "Wed, 10 Jun 2015 12:54:14 GMT",
"version": "v1"
}
] | 2017-04-19 | [
[
"Meissner",
"Krzysztof A.",
""
],
[
"Nurowski",
"Pawel",
""
]
] | We show that two consecutive Universes with positive cosmological constants filled with perfect fluids and conformal to the positive-spatial-curvature FLRW metric by an analytic conformal transformation have the following features implied by the Einstein equations: a) the fluids can only belong to 4 classes (radiation,... |
0904.0815 | Lorenzo Sindoni | Stefano Liberati, Lorenzo Sindoni, Sebastiano Sonego | Linking the trans-Planckian and the information loss problems in black
hole physics | 10 pages, 2 figures. Replaced with the version to be published in
General Relativity and Gravitation | Gen.Rel.Grav.42:1139-1152,2010 | 10.1007/s10714-009-0899-2 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The trans-Planckian and information loss problems are usually discussed in
the literature as separate issues concerning the nature of Hawking radiation.
Here we instead argue that they are intimately linked, and can be understood as
"two sides of the same coin" once it is accepted that general relativity is an
effect... | [
{
"created": "Mon, 6 Apr 2009 18:47:22 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Oct 2009 08:52:04 GMT",
"version": "v2"
}
] | 2014-11-18 | [
[
"Liberati",
"Stefano",
""
],
[
"Sindoni",
"Lorenzo",
""
],
[
"Sonego",
"Sebastiano",
""
]
] | The trans-Planckian and information loss problems are usually discussed in the literature as separate issues concerning the nature of Hawking radiation. Here we instead argue that they are intimately linked, and can be understood as "two sides of the same coin" once it is accepted that general relativity is an effectiv... |
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