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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/0303020 | Alfonso Garcia-Parrado | Alfonso Garc\'ia-Parrado and Jos\'e M. M. Senovilla | Causal symmetries | LaTeX2e file with CQG templates. 8 pages and no figures. Submitted to
Classical and Quantum gravity | Class.Quant.Grav. 20 (2003) L139 | 10.1088/0264-9381/20/9/103 | null | gr-qc math-ph math.DG math.MP | null | Based on the recent work \cite{PII} we put forward a new type of
transformation for Lorentzian manifolds characterized by mapping every causal
future-directed vector onto a causal future-directed vector. The set of all
such transformations, which we call causal symmetries, has the structure of a
submonoid which conta... | [
{
"created": "Wed, 5 Mar 2003 09:45:07 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"García-Parrado",
"Alfonso",
""
],
[
"Senovilla",
"José M. M.",
""
]
] | Based on the recent work \cite{PII} we put forward a new type of transformation for Lorentzian manifolds characterized by mapping every causal future-directed vector onto a causal future-directed vector. The set of all such transformations, which we call causal symmetries, has the structure of a submonoid which contain... |
2203.06912 | Yeheng Tong | Mingzhe Li, Yeheng Tong, Dehao Zhao | Possible consistent model of parity violations in the symmetric
teleparallel gravity | arXiv admin note: text overlap with arXiv:2201.02357 | Phys. Rev. D 105, 104002 (2022) | 10.1103/PhysRevD.105.104002 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Many parity violating gravity models suffer from the ghost instability
problem. In this paper, we consider a symmetric teleparallel gravity model that
extends the general relativity equivalent model by several parity violating
interactions between the gravitational field and a scalar field. These
interactions exclude... | [
{
"created": "Mon, 14 Mar 2022 08:03:27 GMT",
"version": "v1"
},
{
"created": "Wed, 18 May 2022 08:33:19 GMT",
"version": "v2"
}
] | 2022-08-23 | [
[
"Li",
"Mingzhe",
""
],
[
"Tong",
"Yeheng",
""
],
[
"Zhao",
"Dehao",
""
]
] | Many parity violating gravity models suffer from the ghost instability problem. In this paper, we consider a symmetric teleparallel gravity model that extends the general relativity equivalent model by several parity violating interactions between the gravitational field and a scalar field. These interactions exclude h... |
2103.16612 | S. M. M. Rasouli | S. M. M. Rasouli, F. Shojai | Geodesic deviation equation in Brans-Dicke theory in arbitrary
dimensions | 34 pages, 7 figures | Physics of the Dark Universe 32 (2021) 100781 | 10.1016/j.dark.2021.100781 | null | gr-qc hep-ph hep-th physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the geodesic deviation equation (GDE) within the
context of the Brans-Dicke (BD) theory in $D$ dimensions. Then, we restrict our
attention to the GDE for the fundamental observers and null vector field past
directed. Concerning the latter, in order to apply the retrieved GDE for the
cosmologic... | [
{
"created": "Tue, 30 Mar 2021 18:34:53 GMT",
"version": "v1"
}
] | 2021-04-01 | [
[
"Rasouli",
"S. M. M.",
""
],
[
"Shojai",
"F.",
""
]
] | In this paper, we study the geodesic deviation equation (GDE) within the context of the Brans-Dicke (BD) theory in $D$ dimensions. Then, we restrict our attention to the GDE for the fundamental observers and null vector field past directed. Concerning the latter, in order to apply the retrieved GDE for the cosmological... |
1311.6398 | Tim-Torben Paetz | Piotr T. Chru\'sciel, Tim-Torben Paetz | A2: Mathematical relativity and other progress in classical gravity
theory - a session report | 13 pages, some minor corrections | Gen Relativ Gravit (2014) 46:1695 | 10.1007/s10714-014-1695-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on selected oral contributions to the A2 session "Mathematical
relativity and other progress in classical gravity theory" of "The 20th
International Conference on General Relativity and Gravitation (GR20)" in
Warsaw.
| [
{
"created": "Mon, 25 Nov 2013 18:38:02 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Mar 2014 13:47:58 GMT",
"version": "v2"
}
] | 2015-06-18 | [
[
"Chruściel",
"Piotr T.",
""
],
[
"Paetz",
"Tim-Torben",
""
]
] | We report on selected oral contributions to the A2 session "Mathematical relativity and other progress in classical gravity theory" of "The 20th International Conference on General Relativity and Gravitation (GR20)" in Warsaw. |
2211.10778 | Sunil Maurya DR. | G. Mustafa, Faisal Javed, S. K. Maurya, Saibal Ray | Possibility of stable thin-shell around wormholes within the string
cloud and quintessential field via the van der Waals and polytropic EOS in
General relativity | 24 figures and 4 tables | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this work, we present the Einstein field equations (EFE) in the framework
of a modified matter source and thus find out the solutions for the Wormhole.
To obtain characteristic solutions set, we employ two kinds of equations of
states (EOS), i.e., the van der Waals and polytropic EOS to the EFE. We adopt
embedding... | [
{
"created": "Sat, 19 Nov 2022 19:19:12 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Feb 2023 15:22:09 GMT",
"version": "v2"
}
] | 2023-02-03 | [
[
"Mustafa",
"G.",
""
],
[
"Javed",
"Faisal",
""
],
[
"Maurya",
"S. K.",
""
],
[
"Ray",
"Saibal",
""
]
] | In this work, we present the Einstein field equations (EFE) in the framework of a modified matter source and thus find out the solutions for the Wormhole. To obtain characteristic solutions set, we employ two kinds of equations of states (EOS), i.e., the van der Waals and polytropic EOS to the EFE. We adopt embedding c... |
gr-qc/0612032 | Kirill Bronnikov | Kirill A. Bronnikov and Alexei A. Starobinsky | No realistic wormholes from ghost-free scalar-tensor phantom dark energy | 8 pages, latex | JETPLett.85:1-5,2007; PismaZh.Eksp.Teor.Fiz.85:3-8.2007 | 10.1134/S0021364007010018 | null | gr-qc astro-ph hep-th | null | It is proved that no wormholes can be formed in viable scalar-tensor models
of dark energy admitting its phantom-like ($w < -1$) behaviour in cosmology,
even in the presence of electric or magnetic fields, if the non-minimal
coupling function $f(\Phi)$ is everywhere positive and the scalar field $\Phi$
itself is not ... | [
{
"created": "Tue, 5 Dec 2006 20:20:41 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bronnikov",
"Kirill A.",
""
],
[
"Starobinsky",
"Alexei A.",
""
]
] | It is proved that no wormholes can be formed in viable scalar-tensor models of dark energy admitting its phantom-like ($w < -1$) behaviour in cosmology, even in the presence of electric or magnetic fields, if the non-minimal coupling function $f(\Phi)$ is everywhere positive and the scalar field $\Phi$ itself is not a ... |
gr-qc/0003093 | Uwe Muench | Uwe Muench, Friedrich W. Hehl, Bahram Mashhoon | Acceleration-Induced Nonlocal Electrodynamics in Minkowski Spacetime | LaTeX file, 3 figures, 14 pages | Phys.Lett. A271 (2000) 8-15 | 10.1016/S0375-9601(00)00316-9 | null | gr-qc | null | We discuss two nonlocal models of electrodynamics in which the nonlocality is
induced by the acceleration of the observer. Such an observer actually measures
an electromagnetic field that exhibits persistent memory effects. We compare
Mashhoon's model with a new ansatz developed here in the framework of charge &
flux... | [
{
"created": "Fri, 24 Mar 2000 00:53:05 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Muench",
"Uwe",
""
],
[
"Hehl",
"Friedrich W.",
""
],
[
"Mashhoon",
"Bahram",
""
]
] | We discuss two nonlocal models of electrodynamics in which the nonlocality is induced by the acceleration of the observer. Such an observer actually measures an electromagnetic field that exhibits persistent memory effects. We compare Mashhoon's model with a new ansatz developed here in the framework of charge & flux e... |
1306.5997 | Naftali Tsitverblit | N. Tsitverblit | Initial Friedmann universe, its spatial flatness, matter creation, and
the cosmological term | 11 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the Friedmann equations, an infinite initial density is avoided only when
the universe is spatially flat. With such equations being then valid when the
scale factor $a=0$, the universe must also be in the state of vacuum when $a$
is infinitesimal. Matter creation thus largely comes from nonlinearity of the
Friedma... | [
{
"created": "Wed, 19 Jun 2013 17:43:41 GMT",
"version": "v1"
}
] | 2013-06-26 | [
[
"Tsitverblit",
"N.",
""
]
] | In the Friedmann equations, an infinite initial density is avoided only when the universe is spatially flat. With such equations being then valid when the scale factor $a=0$, the universe must also be in the state of vacuum when $a$ is infinitesimal. Matter creation thus largely comes from nonlinearity of the Friedmann... |
1803.06666 | Vaishak Prasad | Vaishak Prasad, Rahul Srinivasan and Sashideep Gutti | Causality Aspects of Modified Kerr-Newman spacetimes | 17 pages, 18 figures | Phys. Rev. D 99, 024023 (2019) | 10.1103/PhysRevD.99.024023 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we address the problem of causality violation in the solutions
of Einstein equations and seek possible causality restoration mechanisms in
modifed theories of gravity. We choose for the above problem, the causality
violation due to the existence of closed time-like curves in the context of
Kerr-Newman ... | [
{
"created": "Sun, 18 Mar 2018 14:25:37 GMT",
"version": "v1"
}
] | 2019-01-23 | [
[
"Prasad",
"Vaishak",
""
],
[
"Srinivasan",
"Rahul",
""
],
[
"Gutti",
"Sashideep",
""
]
] | In this paper, we address the problem of causality violation in the solutions of Einstein equations and seek possible causality restoration mechanisms in modifed theories of gravity. We choose for the above problem, the causality violation due to the existence of closed time-like curves in the context of Kerr-Newman bl... |
2310.07181 | Ayan Banerjee | Anirudh Pradhan, Safiqul Islam, M. Zeyauddin and Ayan Banerjee | Non-Commutative Effects on Wormholes in Rastall-Rainbow Gravity | 13 pages, 7 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this present article, we explore the physical properties and
characteristics of static, spherically symmetric wormholes in the background of
Rastall-Rainbow gravity. The Rastall-Rainbow gravity theory has recently been
proposed as a combination of two theories, namely, the Rastall theory and the
Rainbow descriptio... | [
{
"created": "Wed, 11 Oct 2023 04:08:29 GMT",
"version": "v1"
}
] | 2023-10-12 | [
[
"Pradhan",
"Anirudh",
""
],
[
"Islam",
"Safiqul",
""
],
[
"Zeyauddin",
"M.",
""
],
[
"Banerjee",
"Ayan",
""
]
] | In this present article, we explore the physical properties and characteristics of static, spherically symmetric wormholes in the background of Rastall-Rainbow gravity. The Rastall-Rainbow gravity theory has recently been proposed as a combination of two theories, namely, the Rastall theory and the Rainbow description.... |
0705.1667 | Lorenzo Iorio | Lorenzo Iorio | Prospects for measuring the moment of inertia of pulsar PSR J0737-3039A | LaTex2e, 5 pages (Elsevier two-column style), 1 table, no figures. To
appear in New Astronomy | NewAstron.14:40-43,2009 | 10.1016/j.newast.2008.04.008 | null | gr-qc astro-ph | null | Here we consider the possibility of measuring at 10% or better the moment of
inertia I of the J0737-3039A via the gravitomagnetic spin-orbit periastron
precession. It turns out that the prospect of measuring the moment of inertia
of PSR J0737-3039A at 10% accuracy or better seems unlikely given the
limitations to the... | [
{
"created": "Fri, 11 May 2007 15:07:29 GMT",
"version": "v1"
},
{
"created": "Mon, 14 May 2007 11:40:52 GMT",
"version": "v2"
},
{
"created": "Tue, 15 May 2007 17:24:45 GMT",
"version": "v3"
},
{
"created": "Sun, 20 May 2007 20:28:53 GMT",
"version": "v4"
},
{
"c... | 2013-09-03 | [
[
"Iorio",
"Lorenzo",
""
]
] | Here we consider the possibility of measuring at 10% or better the moment of inertia I of the J0737-3039A via the gravitomagnetic spin-orbit periastron precession. It turns out that the prospect of measuring the moment of inertia of PSR J0737-3039A at 10% accuracy or better seems unlikely given the limitations to the p... |
gr-qc/0512128 | David Delphenich | David Delphenich | Spinors and pre-metric electromagnetism | 12 pages, presented at the Seventh International Conference on
Clifford Algebras held in Toulouse, May, 2005 | null | null | null | gr-qc | null | The basic concepts of the formulation of Maxwellian electromagnetism in the
absence of a Minkowski scalar product on spacetime are summarized, with
particular emphasis on the way that the electromagnetic constitutive law on the
space of bivectors over spacetime supplants the role of the Minkowski scalar
product on sp... | [
{
"created": "Thu, 22 Dec 2005 04:21:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Delphenich",
"David",
""
]
] | The basic concepts of the formulation of Maxwellian electromagnetism in the absence of a Minkowski scalar product on spacetime are summarized, with particular emphasis on the way that the electromagnetic constitutive law on the space of bivectors over spacetime supplants the role of the Minkowski scalar product on spac... |
1408.6412 | Peng Huang | Peng Huang, Fang-Fang Yuan | Generalized Hodge dual for torsion in teleparallel gravity | 12 pages, corrected typos, rearranged references | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For teleparallel gravity in four dimensions, Lucas and Pereira have shown
that a generalized Hodge dual for torsion tensor can be defined with
coefficients determined by mathematical consistency. In this paper, we
demonstrate that a direct generalization to other dimensions fails and no new
generalized Hodge dual ope... | [
{
"created": "Wed, 27 Aug 2014 13:50:25 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Sep 2014 02:00:41 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Apr 2015 18:12:30 GMT",
"version": "v3"
}
] | 2015-04-14 | [
[
"Huang",
"Peng",
""
],
[
"Yuan",
"Fang-Fang",
""
]
] | For teleparallel gravity in four dimensions, Lucas and Pereira have shown that a generalized Hodge dual for torsion tensor can be defined with coefficients determined by mathematical consistency. In this paper, we demonstrate that a direct generalization to other dimensions fails and no new generalized Hodge dual opera... |
gr-qc/9611063 | null | Andrew Matacz (University of Sydney, Australia) | Inflation and the Fine-Tuning Problem | 5 pages in Latex (uses Revtex), no figures. Minor changes to the text
only | Phys.Rev.D56:1836-1840,1997 | 10.1103/PhysRevD.56.1836 | null | gr-qc astro-ph hep-ph | null | I describe a recently derived stochastic approach to inflaton dynamics which
can address some serious problems associated with conventional inflationary
theory. Using this theory I derive an exact solution to the stochastic dynamics
for the case of a $\lambda\phi^4$ potential and use it to study the generated
primord... | [
{
"created": "Tue, 26 Nov 1996 23:29:14 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Dec 1996 04:38:07 GMT",
"version": "v2"
}
] | 2009-12-30 | [
[
"Matacz",
"Andrew",
"",
"University of Sydney, Australia"
]
] | I describe a recently derived stochastic approach to inflaton dynamics which can address some serious problems associated with conventional inflationary theory. Using this theory I derive an exact solution to the stochastic dynamics for the case of a $\lambda\phi^4$ potential and use it to study the generated primordia... |
2302.12286 | Jose Miguel Ladino | Jose Miguel Ladino and Eduard Larra\~naga | Implementaci\'on computacional para el estudio de part\'iculas con
esp\'in en agujeros negros rotantes modificados cu\'anticamente | 12 pages, in Spanish language, 7 figures, 6 tables | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The trajectories of test particles with spin orbiting a black hole depend on
the geometry of space-time and the intrinsic physical characteristics of the
test particles. In this work the motion of test particles with spin on the
innermost stable circular orbit of a quantum improved rotating black hole is
studied. A c... | [
{
"created": "Thu, 23 Feb 2023 19:10:49 GMT",
"version": "v1"
}
] | 2023-02-27 | [
[
"Ladino",
"Jose Miguel",
""
],
[
"Larrañaga",
"Eduard",
""
]
] | The trajectories of test particles with spin orbiting a black hole depend on the geometry of space-time and the intrinsic physical characteristics of the test particles. In this work the motion of test particles with spin on the innermost stable circular orbit of a quantum improved rotating black hole is studied. A com... |
1611.06289 | Reinaldo Gleiser | Reinaldo J. Gleiser (IFEG and FAMAF, Universidad Nacional de Cordoba,
Argentina) | Linear stability of the Linet - Tian solution with negative cosmological
constant | 29 pages. 9 figures | null | 10.1088/1361-6382/aa60f0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we analyze the linear stability of the Linet - Tian solution
with negative cosmological constant. In the limit of vanishing cosmological
constant the Linet - Tian metric reduces to a form of the Levi - Civita metric,
and, therefore, it can be considered as a generalization of the former to
include a cos... | [
{
"created": "Sat, 19 Nov 2016 01:34:14 GMT",
"version": "v1"
}
] | 2017-03-15 | [
[
"Gleiser",
"Reinaldo J.",
"",
"IFEG and FAMAF, Universidad Nacional de Cordoba,\n Argentina"
]
] | In this paper we analyze the linear stability of the Linet - Tian solution with negative cosmological constant. In the limit of vanishing cosmological constant the Linet - Tian metric reduces to a form of the Levi - Civita metric, and, therefore, it can be considered as a generalization of the former to include a cosmo... |
2211.02581 | Matheus Nilton | M. Nilton, G. Alencar, and R. N. Costa Filho | Black Strings in Asymptotically Safe Gravity | 18 pages, 9 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study black strings in asymptotic safety gravity (ASG)
scenario. The ASG approach is introduced by implementing gravitational and
cosmological running coupling constants directly in the black string metric. We
calculate the Hawking temperature, entropy, and heat capacity of the improved
black string... | [
{
"created": "Fri, 4 Nov 2022 16:51:13 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Dec 2022 13:08:35 GMT",
"version": "v2"
},
{
"created": "Sat, 27 May 2023 01:43:37 GMT",
"version": "v3"
}
] | 2023-05-30 | [
[
"Nilton",
"M.",
""
],
[
"Alencar",
"G.",
""
],
[
"Filho",
"R. N. Costa",
""
]
] | In this paper, we study black strings in asymptotic safety gravity (ASG) scenario. The ASG approach is introduced by implementing gravitational and cosmological running coupling constants directly in the black string metric. We calculate the Hawking temperature, entropy, and heat capacity of the improved black string m... |
gr-qc/0104053 | Konstantina Savvidou | Ntina Savvidou | Poincare' invariance for continuous-time histories | 32 pages, Latex. In a non-relativistic history theory there exist two
distinct Poincare' groups. The `internal' Poincare' group is analogous to the
one that arises in standard canonical quantisation scheme; the `external'
Poincare' group performs explicit changes of the spacetime foliation that is
implicitly as... | J.Math.Phys. 43 (2002) 3053-3073 | 10.1063/1.1471924 | Imperial/TP/0-01/14 | gr-qc math-ph math.MP quant-ph | null | We show that the relativistic analogue of the two types of time translation
in a non-relativistic history theory is the existence of two distinct
Poincar\'{e} groups. The `internal' Poincar\'{e} group is analogous to the one
that arises in the standard canonical quantisation scheme; the `external'
Poincar\'{e} group ... | [
{
"created": "Tue, 17 Apr 2001 22:59:59 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Savvidou",
"Ntina",
""
]
] | We show that the relativistic analogue of the two types of time translation in a non-relativistic history theory is the existence of two distinct Poincar\'{e} groups. The `internal' Poincar\'{e} group is analogous to the one that arises in the standard canonical quantisation scheme; the `external' Poincar\'{e} group is... |
1302.0565 | Cosimo Bambi | Cosimo Bambi, Georgios Lukes-Gerakopoulos | Testing the existence of regions of stable orbits at small radii around
black hole candidates | 11 pages, 5 figures. v2: refereed version | Phys.Rev.D87:083006,2013 | 10.1103/PhysRevD.87.083006 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black hole candidates in X-ray binary systems and at the centers of galaxies
are expected to be the Kerr black holes of General Relativity, but the actual
nature of these objects has yet to be verified. In this paper, we consider the
possibility that they are exotic compact objects and we describe their exterior
grav... | [
{
"created": "Mon, 4 Feb 2013 01:47:50 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Apr 2013 10:43:13 GMT",
"version": "v2"
}
] | 2013-04-22 | [
[
"Bambi",
"Cosimo",
""
],
[
"Lukes-Gerakopoulos",
"Georgios",
""
]
] | Black hole candidates in X-ray binary systems and at the centers of galaxies are expected to be the Kerr black holes of General Relativity, but the actual nature of these objects has yet to be verified. In this paper, we consider the possibility that they are exotic compact objects and we describe their exterior gravit... |
2008.05425 | John Barrow | John D. Barrow | Is the universe ill-posed? | 5 pages, no figures | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss an unusual consequence of the behaviour of general relativistic
cosmological models when they initial value problem is not well-posed because
of the lack of the local Lipschitz condition. A new type of 'zero universe'
arises with vanishing scale factor, and its first time derivative, at all
times. We discu... | [
{
"created": "Wed, 12 Aug 2020 16:29:34 GMT",
"version": "v1"
}
] | 2020-08-13 | [
[
"Barrow",
"John D.",
""
]
] | We discuss an unusual consequence of the behaviour of general relativistic cosmological models when they initial value problem is not well-posed because of the lack of the local Lipschitz condition. A new type of 'zero universe' arises with vanishing scale factor, and its first time derivative, at all times. We discuss... |
1912.08175 | Tim Schmitz | Tim Schmitz | Towards a quantum Oppenheimer-Snyder model | 10 pages, 5 figures, reference added | Phys. Rev. D 101, 026016 (2020) | 10.1103/PhysRevD.101.026016 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a consistent canonical formulation of the flat Oppenheimer-Snyder
model, including the Schwarzschild exterior. The switching between comoving and
stationary observer is realized by promoting the coordinate transformation
between dust proper time and Schwarzschild-Killing time to a canonical one.
This leads... | [
{
"created": "Tue, 17 Dec 2019 18:29:04 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Dec 2019 12:40:21 GMT",
"version": "v2"
}
] | 2020-01-28 | [
[
"Schmitz",
"Tim",
""
]
] | We present a consistent canonical formulation of the flat Oppenheimer-Snyder model, including the Schwarzschild exterior. The switching between comoving and stationary observer is realized by promoting the coordinate transformation between dust proper time and Schwarzschild-Killing time to a canonical one. This leads t... |
2302.10290 | Gareth Marks | Gareth Arturo Marks, Robert B. Mann and Damian Sheppard | Slowly Rotating Black Holes in Einsteinian Quartic Gravities | 28 pages, 3 figures | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We study slowly rotating black hole solutions in the six independent theories
of Einstein Quartic Gravity (EQG) in four dimensions. Unlike in the static case
for which all six theories yield the same solution, for rotating black holes we
obtain distinct results for five out of the six theories. Working to leading
ord... | [
{
"created": "Mon, 20 Feb 2023 20:28:14 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Feb 2023 19:06:00 GMT",
"version": "v2"
}
] | 2023-02-28 | [
[
"Marks",
"Gareth Arturo",
""
],
[
"Mann",
"Robert B.",
""
],
[
"Sheppard",
"Damian",
""
]
] | We study slowly rotating black hole solutions in the six independent theories of Einstein Quartic Gravity (EQG) in four dimensions. Unlike in the static case for which all six theories yield the same solution, for rotating black holes we obtain distinct results for five out of the six theories. Working to leading order... |
1002.0489 | Giulio Mazzolo | Massimo Cerdonio, Fabrizio De Marchi, Roberto De Pietri, Philippe
Jetzer, Francesco Marzari, Giulio Mazzolo, Antonello Ortolan and Mauro Sereno | Effects of Interplanetary Dust on the LISA drag-free Constellation | 11 pages, 6 figures, to be published on the special issue of
"Celestial Mechanics and Dynamical Astronomy" on the CELMEC V conference | null | 10.1007/s10569-010-9256-8 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The analysis of non-radiative sources of static or time-dependent
gravitational fields in the Solar System is crucial to accurately estimate the
free-fall orbits of the LISA space mission. In particular, we take into account
the gravitational effects of Interplanetary Dust (ID) on the spacecraft
trajectories. The per... | [
{
"created": "Tue, 2 Feb 2010 13:48:17 GMT",
"version": "v1"
}
] | 2015-05-18 | [
[
"Cerdonio",
"Massimo",
""
],
[
"De Marchi",
"Fabrizio",
""
],
[
"De Pietri",
"Roberto",
""
],
[
"Jetzer",
"Philippe",
""
],
[
"Marzari",
"Francesco",
""
],
[
"Mazzolo",
"Giulio",
""
],
[
"Ortolan",
"Antonello",... | The analysis of non-radiative sources of static or time-dependent gravitational fields in the Solar System is crucial to accurately estimate the free-fall orbits of the LISA space mission. In particular, we take into account the gravitational effects of Interplanetary Dust (ID) on the spacecraft trajectories. The pertu... |
2111.15562 | Christian Hoelbling | Jana N. Guenther, Christian Hoelbling, Lukas Varnhorst | Real time dynamics of a semiclassical gravitational collapse of a scalar
quantum field | 9 pages, 4 figures, talk presented at the 38th International
Symposium on Lattice Field Theory - LATTICE2021, 26th-30th, July, 2021,
Zoom/Gather@Massachusetts Institute of Technology | PoS(LATTICE2021)156 | null | WUB/21-06 | gr-qc hep-lat | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We present a new formalism for numerically treating the semiclassical
gravitational collapse of a scalar quantum field in the radially symmetric
case. Our formalism is time reversal invariant and the evolution of the scalar
fields is unitary. We present some first results in the angular momentum $l=0$
approximation f... | [
{
"created": "Tue, 30 Nov 2021 16:54:50 GMT",
"version": "v1"
}
] | 2021-12-01 | [
[
"Guenther",
"Jana N.",
""
],
[
"Hoelbling",
"Christian",
""
],
[
"Varnhorst",
"Lukas",
""
]
] | We present a new formalism for numerically treating the semiclassical gravitational collapse of a scalar quantum field in the radially symmetric case. Our formalism is time reversal invariant and the evolution of the scalar fields is unitary. We present some first results in the angular momentum $l=0$ approximation for... |
gr-qc/0501034 | Samuel Picton Drake | S. P. Drake | The Equivalence Principle as a Stepping Stone from Special to General
Relativity: A Socratic Dialog | 8 pages, 1 figure, uses the revtex4 documentclass. Submitted to the
American Journal of Physics. Minor modification and corrections following
referees' comments | Am.J.Phys. 74 (2006) 22-25 | 10.1119/1.2135316 | null | gr-qc | null | In this paper we show how the student can be led to an understanding of the
connection between special relativity and general relativity by considering the
time dilation effect of clocks placed on the surface of the Earth. This paper
is written as a Socratic dialog between a lecturer Sam and a student Kim.
| [
{
"created": "Tue, 11 Jan 2005 07:33:59 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Aug 2005 02:21:43 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Drake",
"S. P.",
""
]
] | In this paper we show how the student can be led to an understanding of the connection between special relativity and general relativity by considering the time dilation effect of clocks placed on the surface of the Earth. This paper is written as a Socratic dialog between a lecturer Sam and a student Kim. |
2009.07657 | S. I. Kruglov | S.I. Kruglov | The shadow of M87* black hole within rational nonlinear electrodynamics | 12 pages, 1 figure, accepted in MPLA | null | 10.1142/S0217732320502910 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider rational nonlinear electrodynamics with the Lagrangian ${\cal L}
= -{\cal F}/(1+2\beta{\cal F})$ (${\cal F}=(1/4)F_{\mu\nu}F^{\mu\nu}$ is the
Lorentz-invariant), proposed in [63], coupled to General Relativity. The
effective geometry induced by nonlinear electrodynamics corrections are found.
We determine... | [
{
"created": "Mon, 14 Sep 2020 19:53:47 GMT",
"version": "v1"
}
] | 2020-12-02 | [
[
"Kruglov",
"S. I.",
""
]
] | We consider rational nonlinear electrodynamics with the Lagrangian ${\cal L} = -{\cal F}/(1+2\beta{\cal F})$ (${\cal F}=(1/4)F_{\mu\nu}F^{\mu\nu}$ is the Lorentz-invariant), proposed in [63], coupled to General Relativity. The effective geometry induced by nonlinear electrodynamics corrections are found. We determine s... |
2202.00171 | Hideki Asada | Naoto Kuwahara, Hideki Asada | Earth rotation and time-domain reconstruction of polarization states for
continuous gravitational waves from a known pulsar | 10 pages, 5 figures, non-sinusoidal waveforms added, Earth and pulsar
spin modulations discussed, pulsar glitch mentioned, computational cost
estimated, accepted for PRD | Phys. Rev. D 106, 024051 (2022) | 10.1103/PhysRevD.106.024051 | null | gr-qc astro-ph.HE hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider effects of the Earth rotation on antenna patterns of a
ground-based gravitational wave (GW) detector in a general metric theory that
allows at most six polarization states (two spin-0, two spin-1 and two spin-2)
in a four-dimensional spacetime. By defining the cyclically averaged antenna
matrix for contin... | [
{
"created": "Tue, 1 Feb 2022 00:59:58 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jul 2022 03:50:53 GMT",
"version": "v2"
}
] | 2022-08-22 | [
[
"Kuwahara",
"Naoto",
""
],
[
"Asada",
"Hideki",
""
]
] | We consider effects of the Earth rotation on antenna patterns of a ground-based gravitational wave (GW) detector in a general metric theory that allows at most six polarization states (two spin-0, two spin-1 and two spin-2) in a four-dimensional spacetime. By defining the cyclically averaged antenna matrix for continuo... |
1504.02377 | Florian Kuhnel | Florian Kuhnel and Marit Sandstad | Corpuscular Consideration of Eternal Inflation | 10 pages, 2 figures; revised version to match submitted version | Eur.Phys.J. C75 (2015) 10, 505 | 10.1140/epjc/s10052-015-3736-7 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the paradigm of eternal inflation in the light of the recently
proposed corpuscular picture of space-time. Comparing the strength of the
average fluctuation of the field up its potential with that of quantum
depletion, we show that the latter can be dominant. We then study the full
respective distributions ... | [
{
"created": "Wed, 25 Mar 2015 10:35:01 GMT",
"version": "v1"
},
{
"created": "Fri, 29 May 2015 07:49:56 GMT",
"version": "v2"
},
{
"created": "Thu, 13 Aug 2015 09:27:54 GMT",
"version": "v3"
}
] | 2015-11-16 | [
[
"Kuhnel",
"Florian",
""
],
[
"Sandstad",
"Marit",
""
]
] | We review the paradigm of eternal inflation in the light of the recently proposed corpuscular picture of space-time. Comparing the strength of the average fluctuation of the field up its potential with that of quantum depletion, we show that the latter can be dominant. We then study the full respective distributions in... |
2204.07160 | Bence B\'ecsy | Bence B\'ecsy, Neil J. Cornish, Matthew C. Digman | Fast Bayesian analysis of individual binaries in pulsar timing array
data | 16 pages, 11 figures, matches published version | Phys. Rev. D 105, 122003 (2022) | 10.1103/PhysRevD.105.122003 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Searching for gravitational waves in pulsar timing array data is
computationally intensive. The data is unevenly sampled, and the noise is
heteroscedastic, necessitating the use of a time-domain likelihood function
with attendant expensive matrix operations. The computational cost is
exacerbated when searching for in... | [
{
"created": "Thu, 14 Apr 2022 17:59:59 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Jun 2022 17:18:01 GMT",
"version": "v2"
}
] | 2022-06-22 | [
[
"Bécsy",
"Bence",
""
],
[
"Cornish",
"Neil J.",
""
],
[
"Digman",
"Matthew C.",
""
]
] | Searching for gravitational waves in pulsar timing array data is computationally intensive. The data is unevenly sampled, and the noise is heteroscedastic, necessitating the use of a time-domain likelihood function with attendant expensive matrix operations. The computational cost is exacerbated when searching for indi... |
1405.6461 | Suman Ghosh | Suman Ghosh | Entanglement entropy due to near horizon degrees of freedom | Substantially revised version, title and abstract modified, new
conclusions | Eur. Phys. J. Plus (2015) 130: 154 | 10.1140/epjp/i2015-15154-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Assuming that the dominant contribution, to the entropy due to entanglement
across a spherical hypersurface, comes from the near horizon degrees of
freedom, we analytically derive the entropy of a free massless scalar field in
Minkowski spacetime across a spherical entangling surface. The resulting
entanglement entro... | [
{
"created": "Mon, 26 May 2014 05:13:27 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Dec 2014 06:19:01 GMT",
"version": "v2"
}
] | 2015-08-19 | [
[
"Ghosh",
"Suman",
""
]
] | Assuming that the dominant contribution, to the entropy due to entanglement across a spherical hypersurface, comes from the near horizon degrees of freedom, we analytically derive the entropy of a free massless scalar field in Minkowski spacetime across a spherical entangling surface. The resulting entanglement entropy... |
gr-qc/9705018 | Thomas Thiemann | Thomas Thiemann | QSD IV : 2+1 Euclidean Quantum Gravity as a model to test 3+1 Lorentzian
Quantum Gravity | 35p, LATEX | Class.Quant.Grav. 15 (1998) 1249-1280 | 10.1088/0264-9381/15/5/011 | HUTMP-96/B-360 | gr-qc hep-th | null | The quantization of Lorentzian or Euclidean 2+1 gravity by canonical methods
is a well-studied problem. However, the constraints of 2+1 gravity are those of
a topological field theory and therefore resemble very little those of the
corresponding Lorentzian 3+1 constraints. In this paper we canonically quantize
Euclid... | [
{
"created": "Sat, 10 May 1997 00:14:23 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Thiemann",
"Thomas",
""
]
] | The quantization of Lorentzian or Euclidean 2+1 gravity by canonical methods is a well-studied problem. However, the constraints of 2+1 gravity are those of a topological field theory and therefore resemble very little those of the corresponding Lorentzian 3+1 constraints. In this paper we canonically quantize Euclidea... |
0910.1278 | Edward Wilson-Ewing | Abhay Ashtekar and Edward Wilson-Ewing | Loop quantum cosmology of Bianchi type II models | 26 pages | Phys.Rev.D80:123532,2009 | 10.1103/PhysRevD.80.123532 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The improved dynamics of loop quantum cosmology is extended to include the
Bianchi type II model. Because these space-times admit both anisotropies and
non-zero spatial curvature, certain technical difficulties arise over and above
those encountered in the analysis of the (anisotropic but spatially flat)
Bianchi type... | [
{
"created": "Wed, 7 Oct 2009 14:54:46 GMT",
"version": "v1"
}
] | 2010-01-07 | [
[
"Ashtekar",
"Abhay",
""
],
[
"Wilson-Ewing",
"Edward",
""
]
] | The improved dynamics of loop quantum cosmology is extended to include the Bianchi type II model. Because these space-times admit both anisotropies and non-zero spatial curvature, certain technical difficulties arise over and above those encountered in the analysis of the (anisotropic but spatially flat) Bianchi type I... |
2407.21524 | Eric Ling | Eric Ling, Argam Ohanyan | Vacuum cosmological spacetimes without CMC Cauchy surfaces | 7 pages, proceedings article for XI International Meeting on
Lorenzian Geometry | null | null | CPH-GEOTOP-DNRF151; CF21-0680 | gr-qc math.DG | http://creativecommons.org/licenses/by/4.0/ | In this article, we extend a construction of [6] to obtain a large class of
vacuum cosmological spacetimes that do not contain any CMC Cauchy surfaces. The
allowed spatial topologies for these examples are of the form $M \# M$, where
$M$ is any closed, oriented, irreducible $3$-manifold which is not spherical.
This c... | [
{
"created": "Wed, 31 Jul 2024 11:01:02 GMT",
"version": "v1"
}
] | 2024-08-06 | [
[
"Ling",
"Eric",
""
],
[
"Ohanyan",
"Argam",
""
]
] | In this article, we extend a construction of [6] to obtain a large class of vacuum cosmological spacetimes that do not contain any CMC Cauchy surfaces. The allowed spatial topologies for these examples are of the form $M \# M$, where $M$ is any closed, oriented, irreducible $3$-manifold which is not spherical. This com... |
1612.00743 | Teng Zhang | Teng Zhang, Stefan L Danilishin, Sebastian Steinlechner, Bryan W Barr,
Angus S Bell, Peter Dupej, Christian Gr\"af, Jan-Simon Hennig, E Alasdair
Houston, Sabina H Huttner, Sean S Leavey, Daniela Pascucci, Borja Sorazu,
Andrew Spencer, Jennifer Wright, Kenneth A Strain, Stefan Hild | Effects of static and dynamic higher-order optical modes in balanced
homodyne readout for future gravitational waves detectors | null | Phys. Rev. D 95, 062001 (2017) | 10.1103/PhysRevD.95.062001 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With the recent discovery of Gravitational waves, marking the start of the
new field of GW astronomy, the push for building more sensitive
laser-interferometric gravitational wave detectors (GWD) has never been
stronger. Balanced homodyne detection (BHD) allows for a quantum noise limited
readout of arbitrary light f... | [
{
"created": "Fri, 2 Dec 2016 16:46:28 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Feb 2017 19:18:52 GMT",
"version": "v2"
}
] | 2017-03-15 | [
[
"Zhang",
"Teng",
""
],
[
"Danilishin",
"Stefan L",
""
],
[
"Steinlechner",
"Sebastian",
""
],
[
"Barr",
"Bryan W",
""
],
[
"Bell",
"Angus S",
""
],
[
"Dupej",
"Peter",
""
],
[
"Gräf",
"Christian",
""
],
... | With the recent discovery of Gravitational waves, marking the start of the new field of GW astronomy, the push for building more sensitive laser-interferometric gravitational wave detectors (GWD) has never been stronger. Balanced homodyne detection (BHD) allows for a quantum noise limited readout of arbitrary light fie... |
2207.00566 | David Brizuela | David Brizuela, Sara F. Uria | Semiclassical study of the Mixmaster model: the quantum Kasner map | 32 pages. Minor changes, version accepted for publication | Phys. Rev. D 106 (2022) 064051 | 10.1103/PhysRevD.106.064051 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | According to the Belinski-Khalatnikov-Lifshitz conjecture, close to a
spacelike singularity different spatial points decouple, and the dynamics can
be described in terms of the Mixmaster (vacuum Bianchi IX) model. In order to
understand the role played by quantum-gravity effects in this context, in the
present work w... | [
{
"created": "Fri, 1 Jul 2022 17:34:18 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Oct 2022 11:27:08 GMT",
"version": "v2"
}
] | 2022-10-07 | [
[
"Brizuela",
"David",
""
],
[
"Uria",
"Sara F.",
""
]
] | According to the Belinski-Khalatnikov-Lifshitz conjecture, close to a spacelike singularity different spatial points decouple, and the dynamics can be described in terms of the Mixmaster (vacuum Bianchi IX) model. In order to understand the role played by quantum-gravity effects in this context, in the present work we ... |
1602.04397 | Osvaldo Pablo Santillan | Ivo Alani, Osvaldo Santillan | Cosmological singularity theorems for $f(R)$ gravity theories | An improved version is published in JCAP 05 (2016) 023 | null | 10.1088/1475-7516/2016/05/023 | null | gr-qc hep-th math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present work some generalizations of the Hawking singularity theorems
in the context of $f(R)$ theories are presented. The assumptions are of these
generalized theorems is that the matter fields satisfy the conditions
$\bigg(T_{ij}-\frac{g_{ij}}{2} T\bigg)k^i k^j\geq 0$ for any generic unit time
like field, th... | [
{
"created": "Sat, 13 Feb 2016 23:02:45 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Feb 2016 02:39:58 GMT",
"version": "v2"
},
{
"created": "Sun, 21 Feb 2016 04:24:02 GMT",
"version": "v3"
},
{
"created": "Fri, 4 Mar 2016 21:49:42 GMT",
"version": "v4"
},
{
"cr... | 2016-05-25 | [
[
"Alani",
"Ivo",
""
],
[
"Santillan",
"Osvaldo",
""
]
] | In the present work some generalizations of the Hawking singularity theorems in the context of $f(R)$ theories are presented. The assumptions are of these generalized theorems is that the matter fields satisfy the conditions $\bigg(T_{ij}-\frac{g_{ij}}{2} T\bigg)k^i k^j\geq 0$ for any generic unit time like field, that... |
0804.2635 | Timothy Clifton | Timothy Clifton | Properties of Black Hole Radiation From Tunnelling | 14 pages, 6 figures | Class.Quant.Grav.25:175022,2008 | 10.1088/0264-9381/25/17/175022 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the space-time associated with the evaporation of a black hole by
quantum mechanical tunnelling events. It is shown that the surface through
which tunnelling occurs is distinct from the global event horizon, and that
this has consequences for the radiation reaching future null infinity. A
spherical collap... | [
{
"created": "Wed, 16 Apr 2008 16:16:07 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Jul 2008 09:32:16 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Clifton",
"Timothy",
""
]
] | We consider the space-time associated with the evaporation of a black hole by quantum mechanical tunnelling events. It is shown that the surface through which tunnelling occurs is distinct from the global event horizon, and that this has consequences for the radiation reaching future null infinity. A spherical collapse... |
gr-qc/0412043 | Rafael A. Vera | R. A. Vera | Recent verifications of a new relativity principle and a new
gravitational theory based on properties of light | Latex 2e, 18 pages. Article prepared for the Texas Symposium on
Relativistic Astrophysics at Stanford. Added references | null | null | null | gr-qc astro-ph | null | Recent astronomical observations verify the new scenario resulting from new
conservation laws and a new relativity principle fixed either by dual
properties of light or by new gravitational (G) tests and the Einstein's
equivalence principle. This scenario is radically different from the classical
one. During a free f... | [
{
"created": "Fri, 10 Dec 2004 01:23:45 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Mar 2005 00:38:06 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Vera",
"R. A.",
""
]
] | Recent astronomical observations verify the new scenario resulting from new conservation laws and a new relativity principle fixed either by dual properties of light or by new gravitational (G) tests and the Einstein's equivalence principle. This scenario is radically different from the classical one. During a free fal... |
1307.8433 | Phuc Nguyen | Phuc H. Nguyen, Manasvi Lingam | Analytical families of 2-component anisotropic polytropes and their
relativistic extensions | Modified to reflect the published version; 16 pages, 8 figures | MNRAS, Volume 436, Issue 3, p.2014-2028 (2013) | 10.1093/mnras/stt1719 | TCC-016-13 | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study a family of two-component anisotropic polytropes
which model a wide range of spherically symmetric astrophysical systems such as
early-type baryonic galaxies. This family is found to contain a large class of
models such as the hypervirial family (which satisfy the virial theorem
locally), the ... | [
{
"created": "Wed, 31 Jul 2013 19:21:56 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Nov 2013 23:50:51 GMT",
"version": "v2"
}
] | 2013-12-09 | [
[
"Nguyen",
"Phuc H.",
""
],
[
"Lingam",
"Manasvi",
""
]
] | In this paper, we study a family of two-component anisotropic polytropes which model a wide range of spherically symmetric astrophysical systems such as early-type baryonic galaxies. This family is found to contain a large class of models such as the hypervirial family (which satisfy the virial theorem locally), the Pl... |
1609.01056 | Shanming Ruan | Rong-Gen Cai, Shan-Ming Ruan, Yun-Long Zhang | Horizon supertranslation and degenerate black hole solutions | 21 pages,no figures, references added, match the version published in
JHEP | null | 10.1007/JHEP09(2016)163 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this note we first review the degenerate vacua arising from the BMS
symmetries. According to the discussion in [1] one can define BMS-analogous
supertranslation and superrotation for spacetime with black hole in Gaussian
null coordinates. In the leading and subleading orders of near horizon
approximation, the infi... | [
{
"created": "Mon, 5 Sep 2016 08:28:19 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Sep 2016 03:06:51 GMT",
"version": "v2"
}
] | 2016-10-03 | [
[
"Cai",
"Rong-Gen",
""
],
[
"Ruan",
"Shan-Ming",
""
],
[
"Zhang",
"Yun-Long",
""
]
] | In this note we first review the degenerate vacua arising from the BMS symmetries. According to the discussion in [1] one can define BMS-analogous supertranslation and superrotation for spacetime with black hole in Gaussian null coordinates. In the leading and subleading orders of near horizon approximation, the infini... |
2201.02542 | Scott Perkins | Scott Perkins and Nicolas Yunes | Are Parametrized Tests of General Relativity with Gravitational Waves
Robust to Unknown Higher Post-Newtonian Order Effects? | 22 pages, 11 figures, updated with additional figure and small
corrections to reflect the published version | Phys. Rev. D 105, 124047 (2022) | 10.1103/PhysRevD.105.124047 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Gravitational wave observations have great potential to reveal new
information about the fundamental nature of gravity, but extracting that
information can be difficult. One popular technique is the parametrized
inspiral test of general relativity (a realization of the parametrized
post-Einsteinian framework), where ... | [
{
"created": "Fri, 7 Jan 2022 17:02:46 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Mar 2022 20:23:34 GMT",
"version": "v2"
},
{
"created": "Tue, 28 Jun 2022 16:29:00 GMT",
"version": "v3"
}
] | 2022-06-29 | [
[
"Perkins",
"Scott",
""
],
[
"Yunes",
"Nicolas",
""
]
] | Gravitational wave observations have great potential to reveal new information about the fundamental nature of gravity, but extracting that information can be difficult. One popular technique is the parametrized inspiral test of general relativity (a realization of the parametrized post-Einsteinian framework), where th... |
1504.04084 | Xue-Mei Deng | Xue-Mei Deng | The Second Post-Newtonian Light Propagation and Its Astrometric
Measurement in the Solar System | 22 pages;Accepted for publication in International Journal of Modern
Physics D (IJMPD) | null | 10.1142/S021827181550056X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The relativistic theories of light propagation are generalized by introducing
two new parameters $\varsigma$ and $\eta$ in the second post-Newtonian (2PN)
order, in addition to the parameterized post-Newtonian parameters $\gamma$ and
$\beta$. This new 2PN parameterized (2PPN) formalism includes the
non-stationary gra... | [
{
"created": "Thu, 16 Apr 2015 02:20:15 GMT",
"version": "v1"
},
{
"created": "Sat, 23 May 2015 03:58:41 GMT",
"version": "v2"
}
] | 2015-05-26 | [
[
"Deng",
"Xue-Mei",
""
]
] | The relativistic theories of light propagation are generalized by introducing two new parameters $\varsigma$ and $\eta$ in the second post-Newtonian (2PN) order, in addition to the parameterized post-Newtonian parameters $\gamma$ and $\beta$. This new 2PN parameterized (2PPN) formalism includes the non-stationary gravi... |
0902.1569 | Paolo Pani | Paolo Pani, Vitor Cardoso | Are black holes in alternative theories serious astrophysical
candidates? The case for Einstein-Dilaton-Gauss-Bonnet black holes | 17 pages - v1: references added - v2: Minor corrections | Phys.Rev.D79:084031,2009 | 10.1103/PhysRevD.79.084031 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is generally accepted that Einstein's theory will get some as yet unknown
corrections, possibly large in the strong field regime. An ideal place to look
for these modifications is around the vicinities of compact objects such as
black holes. Our case study here are Dilatonic Black Holes, which arise in the
framewo... | [
{
"created": "Tue, 10 Feb 2009 01:26:25 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Feb 2009 16:47:47 GMT",
"version": "v2"
},
{
"created": "Tue, 21 Apr 2009 14:43:21 GMT",
"version": "v3"
}
] | 2009-09-11 | [
[
"Pani",
"Paolo",
""
],
[
"Cardoso",
"Vitor",
""
]
] | It is generally accepted that Einstein's theory will get some as yet unknown corrections, possibly large in the strong field regime. An ideal place to look for these modifications is around the vicinities of compact objects such as black holes. Our case study here are Dilatonic Black Holes, which arise in the framework... |
1410.6687 | C\'edric Huwyler | C\'edric Huwyler, Edward K. Porter, Philippe Jetzer | A Time Domain Waveform for Testing General Relativity | 5 pages. Proceedings of LISA Symposium X, submitted to Journal of
Physics: Conference Series | null | 10.1088/1742-6596/610/1/012046 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational-wave parameter estimation is only as good as the theory the
waveform generation models are based upon. It is therefore crucial to test
General Relativity (GR) once data becomes available. Many previous works, such
as studies connected with the ppE framework by Yunes and Pretorius, rely on the
stationary... | [
{
"created": "Fri, 24 Oct 2014 14:17:00 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Huwyler",
"Cédric",
""
],
[
"Porter",
"Edward K.",
""
],
[
"Jetzer",
"Philippe",
""
]
] | Gravitational-wave parameter estimation is only as good as the theory the waveform generation models are based upon. It is therefore crucial to test General Relativity (GR) once data becomes available. Many previous works, such as studies connected with the ppE framework by Yunes and Pretorius, rely on the stationary p... |
gr-qc/9402044 | Tonatiuh Matos | Tonatiuh Matos and Jerzy Plebanski | Axisymmetric Stationary Solutions as Harmonic Maps | 17 TeX pages, one table,( CINVESTAV- preprint 12/93) | null | 10.1007/BF02108050 | null | gr-qc | null | We present a method for generating exact solutions of Einstein equations in
vacuum using harmonic maps, when the spacetime possesses two commutating
Killing vectors. This method consists in writing the axisymmetric stationry
Einstein equations in vacuum as a harmonic map which belongs to the group
SL(2,R), and decomp... | [
{
"created": "Sat, 26 Feb 1994 00:34:32 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Matos",
"Tonatiuh",
""
],
[
"Plebanski",
"Jerzy",
""
]
] | We present a method for generating exact solutions of Einstein equations in vacuum using harmonic maps, when the spacetime possesses two commutating Killing vectors. This method consists in writing the axisymmetric stationry Einstein equations in vacuum as a harmonic map which belongs to the group SL(2,R), and decompos... |
1006.5682 | Alexander A. Chernitskii | Alexander A. Chernitskii | Gravitation as a vacuum nonlinear electrodynamics effect | 3 pages, The article for Proceedings of the MG11 Meeting on General
Relativity, Berlin, Germany 23 - 29 July 2006 | On Recent Developments in Theoretical and Experimental General
Relativity, Gravitation and Relativistic Field Theories (In 3 Volumes).Edited
by H.Kleinert, R.T. Jantzen, R.Ruffini, World Scientific, 2008, pp. 1236-1238 | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Effective Riemann space effect of vacuum nonlinear electrodynamics is
considered in the context of theory for unified gravitation and
electromagnetism. The electromagnetic four-vector potential in the scope of
Born-Infeld nonlinear electrodynamics model is considered as the unified field.
The electromagnetic interact... | [
{
"created": "Tue, 29 Jun 2010 17:18:36 GMT",
"version": "v1"
}
] | 2010-06-30 | [
[
"Chernitskii",
"Alexander A.",
""
]
] | Effective Riemann space effect of vacuum nonlinear electrodynamics is considered in the context of theory for unified gravitation and electromagnetism. The electromagnetic four-vector potential in the scope of Born-Infeld nonlinear electrodynamics model is considered as the unified field. The electromagnetic interactio... |
gr-qc/9902065 | Mauro Francaviglia | L. Fatibene, M. Ferraris, M. Francaviglia, M. Raiteri | Remarks on Conserved Quantities and Entropy of BTZ Black Hole Solutions.
Part II: BCEA Theory | PlainTEX, 20 pages | Phys.Rev. D60 (1999) 124013 | 10.1103/PhysRevD.60.124013 | null | gr-qc | null | The BTZ black hole solution for (2+1)-spacetime is considered as a solution
of a triad-affine theory (BCEA) in which topological matter is introduced to
replace the cosmological constant in the model. Conserved quantities and
entropy are calculated via Noether theorem, reproducing in a geometrical and
global framewor... | [
{
"created": "Mon, 22 Feb 1999 09:40:48 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Fatibene",
"L.",
""
],
[
"Ferraris",
"M.",
""
],
[
"Francaviglia",
"M.",
""
],
[
"Raiteri",
"M.",
""
]
] | The BTZ black hole solution for (2+1)-spacetime is considered as a solution of a triad-affine theory (BCEA) in which topological matter is introduced to replace the cosmological constant in the model. Conserved quantities and entropy are calculated via Noether theorem, reproducing in a geometrical and global framework ... |
2104.05705 | Charles Wang | Charles H.-T. Wang, Melania Mieczkowska | Bremsstrahlung of Light through Spontaneous Emission of Gravitational
Waves | 16 pages, 3 figures, version published in the Special Issue of
Symmetry "New Frontiers in Quantum Gravity" | Symmetry 2021, 13(5), 852 | 10.3390/sym13050852 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Zero-point fluctuations are a universal consequence of quantum theory. Vacuum
fluctuations of electromagnetic field have provided crucial evidence and
guidance for QED as a successful quantum field theory with a defining gauge
symmetry through the Lamb shift, Casimir effect, and spontaneous emission. In
an accelerate... | [
{
"created": "Mon, 12 Apr 2021 17:59:04 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Apr 2021 14:21:35 GMT",
"version": "v2"
},
{
"created": "Tue, 11 May 2021 16:20:13 GMT",
"version": "v3"
}
] | 2021-05-12 | [
[
"Wang",
"Charles H. -T.",
""
],
[
"Mieczkowska",
"Melania",
""
]
] | Zero-point fluctuations are a universal consequence of quantum theory. Vacuum fluctuations of electromagnetic field have provided crucial evidence and guidance for QED as a successful quantum field theory with a defining gauge symmetry through the Lamb shift, Casimir effect, and spontaneous emission. In an accelerated ... |
1312.4631 | Alexandros P. Kouretsis | Alexandros P. Kouretsis | Cosmic magnetization in curved and Lorentz violating space-times | Version to appear in EPJC | null | 10.1140/epjc/s10052-014-2879-2 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The presence of the large-scale magnetic fields is one of the greatest
puzzles of contemporary cosmology. The symmetries of the electromagnetic field
theory combined with the geometric structure of the FRW universe leads to an
adiabatic decay of the primordial magnetic fields. Due to this rapid decay the
residual lar... | [
{
"created": "Tue, 17 Dec 2013 03:48:56 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Apr 2014 19:49:15 GMT",
"version": "v2"
}
] | 2015-06-18 | [
[
"Kouretsis",
"Alexandros P.",
""
]
] | The presence of the large-scale magnetic fields is one of the greatest puzzles of contemporary cosmology. The symmetries of the electromagnetic field theory combined with the geometric structure of the FRW universe leads to an adiabatic decay of the primordial magnetic fields. Due to this rapid decay the residual large... |
gr-qc/0512019 | Hunter Monroe | Hunter Monroe | The Duality of Time Dilation and Velocity | 7 pages, Latex2e | null | null | null | gr-qc astro-ph math.DG | null | Time dilation $\frac{1}{\sqrt{1-v^2}}$ and relative velocity $v$ are
observationally indistinguishable in the special theory of relativity, a
duality that carries over into the general theory under Fermi coordinates along
a curve (in coordinate-independent language, in the tangent Minkowski space
along the curve). Fo... | [
{
"created": "Mon, 5 Dec 2005 16:34:33 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Dec 2005 03:51:37 GMT",
"version": "v2"
},
{
"created": "Sun, 5 Mar 2006 01:17:01 GMT",
"version": "v3"
},
{
"created": "Wed, 22 Mar 2006 03:02:56 GMT",
"version": "v4"
},
{
"crea... | 2007-05-23 | [
[
"Monroe",
"Hunter",
""
]
] | Time dilation $\frac{1}{\sqrt{1-v^2}}$ and relative velocity $v$ are observationally indistinguishable in the special theory of relativity, a duality that carries over into the general theory under Fermi coordinates along a curve (in coordinate-independent language, in the tangent Minkowski space along the curve). For ... |
2312.06009 | Aditya Vijaykumar | Kruthi Krishna, Aditya Vijaykumar, Apratim Ganguly, Colm Talbot,
Sylvia Biscoveanu, Richard N George, Natalie Williams, Aaron Zimmerman | Accelerated parameter estimation in Bilby with relative binning | 19 pages, 11 figures | null | null | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe an implementation of the relative binning technique to speed up
parameter estimation of gravitational-wave signals. We first give a pedagogical
overview of relative binning, discussing also the expressions for the
likelihood marginalized over phase and distance. Then, we describe the details
of the code i... | [
{
"created": "Sun, 10 Dec 2023 21:48:52 GMT",
"version": "v1"
}
] | 2023-12-12 | [
[
"Krishna",
"Kruthi",
""
],
[
"Vijaykumar",
"Aditya",
""
],
[
"Ganguly",
"Apratim",
""
],
[
"Talbot",
"Colm",
""
],
[
"Biscoveanu",
"Sylvia",
""
],
[
"George",
"Richard N",
""
],
[
"Williams",
"Natalie",
""
... | We describe an implementation of the relative binning technique to speed up parameter estimation of gravitational-wave signals. We first give a pedagogical overview of relative binning, discussing also the expressions for the likelihood marginalized over phase and distance. Then, we describe the details of the code in ... |
gr-qc/0405068 | Oliver Preuss | Oliver Preuss (1), Mark P. Haugan (2), Sami K. Solanki (1), Stefan
Jordan (3,4) ((1) Max-Planck-Institut fuer Aeronomie, Katlenburg-Lindau,
Germany (2) Department of Physics, Purdue University, Indiana, USA (3)
Universitaet Tuebingen, Institut fuer Astronomie und Astrophysik, Germany (4)
Astronomisches Rechen-I... | An astronomical search for evidence of new physics: Limits on
gravity-induced birefringence from the magnetic white dwarf RE J0317-853 | Statements about Moffat's NGT modified. Accepted for publication in
Phys.Rev.D | Phys.Rev. D70 (2004) 067101 | 10.1103/PhysRevD.70.067101 | null | gr-qc astro-ph | null | The coupling of the electromagnetic field directly with gravitational gauge
fields leads to new physical effects that can be tested using astronomical
data. Here we consider a particular case for closer scrutiny, a specific
nonminimal coupling of torsion to electromagnetism, which enters into a
metric-affine geometry... | [
{
"created": "Thu, 13 May 2004 09:28:51 GMT",
"version": "v1"
},
{
"created": "Wed, 26 May 2004 13:08:59 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Preuss",
"Oliver",
""
],
[
"Haugan",
"Mark P.",
""
],
[
"Solanki",
"Sami K.",
""
],
[
"Jordan",
"Stefan",
""
]
] | The coupling of the electromagnetic field directly with gravitational gauge fields leads to new physical effects that can be tested using astronomical data. Here we consider a particular case for closer scrutiny, a specific nonminimal coupling of torsion to electromagnetism, which enters into a metric-affine geometry o... |
2408.03417 | Siddheshwar Kadam | S. A. Kadam, L. K. Duchaniya, B. Mishra | Teleparallel Gravity and Quintessence: The Role of Nonminimal Boundary
Couplings | 30 pages, 18 figures, 4 tables. Constructive comments are welcome | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we have outlined the development of an autonomous dynamical
system within a general scalar-tensor gravity framework. This framework
encompasses the overall structure of the non-minimally coupled scalar field
functions for both the torsion scalar ($T$) and the boundary term ($B$). We
have examined three... | [
{
"created": "Tue, 6 Aug 2024 19:32:11 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Aug 2024 05:29:17 GMT",
"version": "v2"
}
] | 2024-08-13 | [
[
"Kadam",
"S. A.",
""
],
[
"Duchaniya",
"L. K.",
""
],
[
"Mishra",
"B.",
""
]
] | In this paper, we have outlined the development of an autonomous dynamical system within a general scalar-tensor gravity framework. This framework encompasses the overall structure of the non-minimally coupled scalar field functions for both the torsion scalar ($T$) and the boundary term ($B$). We have examined three w... |
1802.09114 | Andrew DeBenedictis | Mason Protter, Andrew DeBenedictis | Loop Quantum Corrected Einstein Yang-Mills Black Holes | 11 pages, 5 figures. Updated version contains clarifications and
several new references. Accepted for publication in Physical Review D | Phys. Rev. D 97, 106009 (2018) | 10.1103/PhysRevD.97.106009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the homogeneous interiors of black holes possessing
SU(2) Yang-Mills fields subject to corrections inspired by loop quantum
gravity. The systems studied possess both magnetic and induced electric
Yang-Mills fields. We consider the system of equations both with and without
Wilson loop correction... | [
{
"created": "Mon, 26 Feb 2018 00:36:23 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Apr 2018 19:16:03 GMT",
"version": "v2"
}
] | 2018-05-17 | [
[
"Protter",
"Mason",
""
],
[
"DeBenedictis",
"Andrew",
""
]
] | In this paper we study the homogeneous interiors of black holes possessing SU(2) Yang-Mills fields subject to corrections inspired by loop quantum gravity. The systems studied possess both magnetic and induced electric Yang-Mills fields. We consider the system of equations both with and without Wilson loop corrections ... |
2112.02699 | Nezihe Uzun | Nezihe Uzun | Symplectic evolution of an observed light bundle | Accepted for the Proceeding of the Sixteenth Marcel Grossmann Meeting | null | null | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Each and every observational information we obtain from the sky regarding the
brightnesses, distances or image distortions resides on the deviation of a null
geodesic bundle. In this talk, we present the symplectic evolution of this
bundle on a reduced phase space. The resulting formalism is analogous to the
one in p... | [
{
"created": "Sun, 5 Dec 2021 22:48:22 GMT",
"version": "v1"
}
] | 2021-12-07 | [
[
"Uzun",
"Nezihe",
""
]
] | Each and every observational information we obtain from the sky regarding the brightnesses, distances or image distortions resides on the deviation of a null geodesic bundle. In this talk, we present the symplectic evolution of this bundle on a reduced phase space. The resulting formalism is analogous to the one in par... |
1510.03063 | Hartmut Abele | Hartmut Abele, Andrei Ivanov, Tobias Jenke, Mario Pitschmann, Peter
Geltenbort | Gravity Resonance Spectroscopy and Einstein-Cartan Gravity | Contributed to the 11th Patras Workshop on Axions, WIMPs and WISPs,
Zaragoza, June 22 to 26, 2015, 6 pages, 4 figures | null | null | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The qBounce experiment offers a new way of looking at gravitation based on
quantum interference. An ultracold neutron is reflected in well-defined quantum
states in the gravity potential of the Earth by a mirror, which allows to apply
the concept of gravity resonance spectroscopy (GRS). This experiment with
neutrons ... | [
{
"created": "Sun, 11 Oct 2015 15:37:26 GMT",
"version": "v1"
}
] | 2015-10-13 | [
[
"Abele",
"Hartmut",
""
],
[
"Ivanov",
"Andrei",
""
],
[
"Jenke",
"Tobias",
""
],
[
"Pitschmann",
"Mario",
""
],
[
"Geltenbort",
"Peter",
""
]
] | The qBounce experiment offers a new way of looking at gravitation based on quantum interference. An ultracold neutron is reflected in well-defined quantum states in the gravity potential of the Earth by a mirror, which allows to apply the concept of gravity resonance spectroscopy (GRS). This experiment with neutrons gi... |
2408.03729 | Hao Xu | Hao Xu | Energy change and Landauer's principle in the interaction between qubit
and quantum field theory | 15 pages | null | null | null | gr-qc hep-th quant-ph | http://creativecommons.org/licenses/by/4.0/ | We give a general description of the system evolution under the interaction
between qubit and quantum field theory up to the second order perturbation,
which is also referred to as the simplified model of light-matter interaction.
The results are classified into rotating and counter-rotating wave terms, the
former co... | [
{
"created": "Wed, 7 Aug 2024 12:35:25 GMT",
"version": "v1"
}
] | 2024-08-08 | [
[
"Xu",
"Hao",
""
]
] | We give a general description of the system evolution under the interaction between qubit and quantum field theory up to the second order perturbation, which is also referred to as the simplified model of light-matter interaction. The results are classified into rotating and counter-rotating wave terms, the former corr... |
1604.04853 | Marcello Ortaggio | Marcello Ortaggio, Jiri Podolsky, Martin Zofka | Higher dimensional Robinson-Trautman spacetimes sourced by p-forms:
static and radiating black holes | 6 pages; compact summary of arXiv:1411.1943. Proceedings of the 14th
Marcel Grossmann Meeting, Rome, July 12-18, 2015
(http://www.icra.it/mg/mg14/) | null | 10.1142/9789813226609_0180 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We summarize results about Robinson-Trautman spacetimes in the presence of an
aligned $p$-form Maxwell field and an arbitrary cosmological constant in $n\ge
4$ dimensions. While in odd dimensions the solutions reduce to static black
holes dressed with an electric and a magnetic field (with an Einstein space
horizon),... | [
{
"created": "Sun, 17 Apr 2016 09:34:41 GMT",
"version": "v1"
}
] | 2018-02-06 | [
[
"Ortaggio",
"Marcello",
""
],
[
"Podolsky",
"Jiri",
""
],
[
"Zofka",
"Martin",
""
]
] | We summarize results about Robinson-Trautman spacetimes in the presence of an aligned $p$-form Maxwell field and an arbitrary cosmological constant in $n\ge 4$ dimensions. While in odd dimensions the solutions reduce to static black holes dressed with an electric and a magnetic field (with an Einstein space horizon), i... |
1812.11801 | Igor Nikitin | Igor Nikitin | RDM-stars as sources of fast radio bursts | added references (ref.12 and ref.42) | in: 2021 J. Phys.: Conf. Ser. 1730 012073 | 10.1088/1742-6596/1730/1/012073 | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we consider a recently formulated model of a black hole coupled
with radially directed flows of dark matter (RDM-star). In this model, a cutoff
by quantum gravity (QG) creates a core of Planck density, filled with a gas of
Planck mass particles, inside the star.
Further, in this model, a fast radio bur... | [
{
"created": "Mon, 31 Dec 2018 14:07:09 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Jan 2019 17:13:12 GMT",
"version": "v2"
}
] | 2021-02-11 | [
[
"Nikitin",
"Igor",
""
]
] | In this work we consider a recently formulated model of a black hole coupled with radially directed flows of dark matter (RDM-star). In this model, a cutoff by quantum gravity (QG) creates a core of Planck density, filled with a gas of Planck mass particles, inside the star. Further, in this model, a fast radio burst (... |
2110.01455 | Jibril Ben Achour | Jibril Ben Achour and Etera R. Livine | Symmetries and conformal bridge in Schwarzschild-(A)dS black hole
mechanics | 22+7 pages, typos corrected, version published in JHEP | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We show that the Schwarzschild-(A)dS black hole mechanics possesses a hidden
symmetry under the three-dimensional Poincar\'e group. This symmetry shows up
after having gauge-fixed the diffeomorphism invariance in the symmetry-reduced
homogeneous Einstein-$\Lambda$ model and stands as a physical symmetry of the
system... | [
{
"created": "Mon, 4 Oct 2021 13:40:18 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Nov 2021 15:06:05 GMT",
"version": "v2"
},
{
"created": "Mon, 20 Dec 2021 16:49:50 GMT",
"version": "v3"
}
] | 2021-12-21 | [
[
"Achour",
"Jibril Ben",
""
],
[
"Livine",
"Etera R.",
""
]
] | We show that the Schwarzschild-(A)dS black hole mechanics possesses a hidden symmetry under the three-dimensional Poincar\'e group. This symmetry shows up after having gauge-fixed the diffeomorphism invariance in the symmetry-reduced homogeneous Einstein-$\Lambda$ model and stands as a physical symmetry of the system. ... |
2305.10970 | Dnyaneshwar Tadas | S. P. Hatkar, D. P. Tadas, S. D. Katore | Domain Wall Bianchi Type $VI_0$ Universe in $f(R,T)$ Gravity | 19 Pages, 11 Figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the Bianchi type-$VI_0$ space time with domain walls in the
framework of the modified $f (R, T)$ theory of gravitation. To solve the field
equations, we assume that the shear scalar $(\sigma)$ is proportional to the
expansion scalar $(\theta)$. We also consider the parametrization of the
equation of the s... | [
{
"created": "Thu, 18 May 2023 13:36:54 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Mar 2024 06:36:41 GMT",
"version": "v2"
}
] | 2024-03-13 | [
[
"Hatkar",
"S. P.",
""
],
[
"Tadas",
"D. P.",
""
],
[
"Katore",
"S. D.",
""
]
] | We consider the Bianchi type-$VI_0$ space time with domain walls in the framework of the modified $f (R, T)$ theory of gravitation. To solve the field equations, we assume that the shear scalar $(\sigma)$ is proportional to the expansion scalar $(\theta)$. We also consider the parametrization of the equation of the sta... |
0907.2871 | Jesus Martin-Martin | J. Martin-Martin and A. Tiemblo | Gravity as a Gauge Theory of Translations | 14 pages. LaTeX 2e | Int.J.Geom.Methods Mod.Phys.07 2010:323-335,2010 | 10.1142/S0219887810003999 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Poincar\'e group can be interpreted as the group of isometries of a
minkowskian space. This point of view suggests to consider the group of
isometries of a given space as the suitable group to construct a gauge theory
of gravity. We extend these ideas to the case of maximally symmetric spaces to
reach a realistic... | [
{
"created": "Thu, 16 Jul 2009 15:39:22 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Martin-Martin",
"J.",
""
],
[
"Tiemblo",
"A.",
""
]
] | The Poincar\'e group can be interpreted as the group of isometries of a minkowskian space. This point of view suggests to consider the group of isometries of a given space as the suitable group to construct a gauge theory of gravity. We extend these ideas to the case of maximally symmetric spaces to reach a realistic t... |
2001.08137 | Mar\'ia Jos\'e Guzm\'an | Rafael Ferraro and Mar\'ia Jos\'e Guzm\'an | Pseudoinvariance and the extra degree of freedom in f(T) gravity | 22 pages, 2 tables, no figures, comments welcome; matches the
published version | Phys. Rev. D 101, 084017 (2020) | 10.1103/PhysRevD.101.084017 | null | gr-qc physics.class-ph | http://creativecommons.org/licenses/by-nc-sa/4.0/ | Nonlinear generalizations of teleparallel gravity entail the modification of
a Lagrangian that is pseudoinvariant under local Lorentz transformations of the
tetrad field. This procedure consequently leads to the loss of the local
pseudoinvariance and the appearance of additional degrees of freedom (d.o.f.).
The const... | [
{
"created": "Wed, 22 Jan 2020 16:34:34 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Apr 2020 15:36:41 GMT",
"version": "v2"
}
] | 2020-04-27 | [
[
"Ferraro",
"Rafael",
""
],
[
"Guzmán",
"María José",
""
]
] | Nonlinear generalizations of teleparallel gravity entail the modification of a Lagrangian that is pseudoinvariant under local Lorentz transformations of the tetrad field. This procedure consequently leads to the loss of the local pseudoinvariance and the appearance of additional degrees of freedom (d.o.f.). The constra... |
1312.1370 | Sergio Ulhoa | S. C. Ulhoa, R. G. G. Amorim and A. F. Santos | On Non-commutative Geodesic Motion | null | General Relativity and Gravitation ,June 2014, 46:1760 | 10.1007/s10714-014-1760-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study the geodesic motion on a noncommutative space-time. As
a result we find a non-commutative geodesic equation and then we derive
corrections of the deviation angle per revolution in terms of the
non-commutative parameter when we specify the problem of Mercury's perihelion.
In this way, we estimate... | [
{
"created": "Wed, 4 Dec 2013 22:18:14 GMT",
"version": "v1"
}
] | 2014-07-17 | [
[
"Ulhoa",
"S. C.",
""
],
[
"Amorim",
"R. G. G.",
""
],
[
"Santos",
"A. F.",
""
]
] | In this work we study the geodesic motion on a noncommutative space-time. As a result we find a non-commutative geodesic equation and then we derive corrections of the deviation angle per revolution in terms of the non-commutative parameter when we specify the problem of Mercury's perihelion. In this way, we estimate t... |
gr-qc/0503038 | Abel Camacho Mr. | Abel Camacho (Dept. of Physics, Universidad Autonoma
Metropolitana--Iztapalapa.) | Deformed dispersion relations and the Hanbury--Brown--Twiss Effect | Accepted in General Relativity and Gravitation | Gen.Rel.Grav. 37 (2005) 1405-1410 | 10.1007/s10714-005-0124-x | null | gr-qc quant-ph | null | In the present work we analyze the possibility of detecting some deformed
dispersion relations, emerging in some quantum--gravity models, resorting to
the so--called Hanbury--Brown--Twiss effect. It will be proved that in some
scenarios the possibilities are not pessimistic. Forsooth, for some values of
the correspon... | [
{
"created": "Wed, 9 Mar 2005 18:18:27 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Camacho",
"Abel",
"",
"Dept. of Physics, Universidad Autonoma\n Metropolitana--Iztapalapa."
]
] | In the present work we analyze the possibility of detecting some deformed dispersion relations, emerging in some quantum--gravity models, resorting to the so--called Hanbury--Brown--Twiss effect. It will be proved that in some scenarios the possibilities are not pessimistic. Forsooth, for some values of the correspondi... |
0809.0907 | Matt Visser | Matt Visser (Victoria University of Wellington) | Traversable wormholes: Some simple examples | Pre-arXiv article from 1989; 7 pages, no figures. (Uploaded to arXiv
to help researchers with limited library facilities.) | Phys.Rev.D39:3182-3184,1989 | 10.1103/PhysRevD.39.3182 | LA-UR-89-46 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Building on the work of Morris, Thorne, and Yurtsever, some particularly
simple examples of traversable wormholes are exhibited. These examples are
notable both because the analysis is not limited to spherically symmetric
cases, and because it is possible to in some sense minimize the use of exotic
matter. In particu... | [
{
"created": "Thu, 4 Sep 2008 22:42:18 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Visser",
"Matt",
"",
"Victoria University of Wellington"
]
] | Building on the work of Morris, Thorne, and Yurtsever, some particularly simple examples of traversable wormholes are exhibited. These examples are notable both because the analysis is not limited to spherically symmetric cases, and because it is possible to in some sense minimize the use of exotic matter. In particula... |
0807.1965 | Gilberto Medeiros Kremer | Rudinei C. de Souza and Gilberto M. Kremer | Noether symmetry for non-minimally coupled fermion fields | Revised version accepted for publication in Classical and Quantum
Gravity | Class.Quant.Grav.25:225006,2008 | 10.1088/0264-9381/25/22/225006 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A cosmological model where a fermion field is non-minimally coupled with the
gravitational field is studied. By applying Noether symmetry the possible
functions for the potential density of the fermion field and for the coupling
are determined. Cosmological solutions are found showing that the non-minimally
coupled f... | [
{
"created": "Sat, 12 Jul 2008 10:48:56 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Sep 2008 06:29:20 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"de Souza",
"Rudinei C.",
""
],
[
"Kremer",
"Gilberto M.",
""
]
] | A cosmological model where a fermion field is non-minimally coupled with the gravitational field is studied. By applying Noether symmetry the possible functions for the potential density of the fermion field and for the coupling are determined. Cosmological solutions are found showing that the non-minimally coupled fer... |
gr-qc/9606010 | Gregory B. Cook | Thomas W. Baumgarte, Gregory B. Cook, Mark A. Scheel, Stuart L.
Shapiro, Saul A. Teukolsky | Implementing an apparent-horizon finder in three dimensions | 14 pages (RevTeX 3.0 with 3 figures) | Phys.Rev. D54 (1996) 4849-4857 | 10.1103/PhysRevD.54.4849 | CRSR-1115 | gr-qc | null | Locating apparent horizons is not only important for a complete understanding
of numerically generated spacetimes, but it may also be a crucial component of
the technique for evolving black-hole spacetimes accurately. A scheme proposed
by Libson et al., based on expanding the location of the apparent horizon in
terms... | [
{
"created": "Thu, 6 Jun 1996 14:13:36 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Baumgarte",
"Thomas W.",
""
],
[
"Cook",
"Gregory B.",
""
],
[
"Scheel",
"Mark A.",
""
],
[
"Shapiro",
"Stuart L.",
""
],
[
"Teukolsky",
"Saul A.",
""
]
] | Locating apparent horizons is not only important for a complete understanding of numerically generated spacetimes, but it may also be a crucial component of the technique for evolving black-hole spacetimes accurately. A scheme proposed by Libson et al., based on expanding the location of the apparent horizon in terms o... |
1905.03848 | Riccardo Sturani | Josiel Mendon\c{c}a (DFTE, UFRN), Riccardo Sturani (IIP, UFRN) | Cosmological model selection from standard siren detections by
third-generation gravitational wave obervatories | 11 pages, 8 figures. V2: version accepted for publication, 13 pages,
10 figures, improved analysis with respect to v1 | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The multi-messenger observation of GW170817 enabled the first historic
measurement of the Hubble constant via a standard siren, so-called in analogy
to standard candles that enabled the measurement of the luminosity distance
versus redshift relationship at small redshift. In the next decades,
third-generation observa... | [
{
"created": "Thu, 9 May 2019 21:03:12 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Apr 2021 13:33:34 GMT",
"version": "v2"
}
] | 2021-04-29 | [
[
"Mendonça",
"Josiel",
"",
"DFTE, UFRN"
],
[
"Sturani",
"Riccardo",
"",
"IIP, UFRN"
]
] | The multi-messenger observation of GW170817 enabled the first historic measurement of the Hubble constant via a standard siren, so-called in analogy to standard candles that enabled the measurement of the luminosity distance versus redshift relationship at small redshift. In the next decades, third-generation observato... |
1507.04217 | Volker Perlick | Volker Perlick, Oleg Yu. Tsupko and Gennady S. Bisnovatyi-Kogan | Influence of a plasma on the shadow of a spherically symmetric black
hole | 11 pages, 2 figures; minor reformulations, some references added | Phys. Rev. D 92, 104031 (2015) | 10.1103/PhysRevD.92.104031 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analytically calculate the influence of a plasma on the shadow of a black
hole (or of another compact object). We restrict to spherically symmetric and
static situations, where the shadow is circular. The plasma is assumed to be
non-magnetized and pressure-less. We derive the general formulas for a
spherically sym... | [
{
"created": "Wed, 15 Jul 2015 13:48:13 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Nov 2015 00:30:37 GMT",
"version": "v2"
}
] | 2015-11-18 | [
[
"Perlick",
"Volker",
""
],
[
"Tsupko",
"Oleg Yu.",
""
],
[
"Bisnovatyi-Kogan",
"Gennady S.",
""
]
] | We analytically calculate the influence of a plasma on the shadow of a black hole (or of another compact object). We restrict to spherically symmetric and static situations, where the shadow is circular. The plasma is assumed to be non-magnetized and pressure-less. We derive the general formulas for a spherically symme... |
1206.6088 | Martin Bojowald | Martin Bojowald | Mathematical Structure of Loop Quantum Cosmology: Homogeneous Models | null | SIGMA 9 (2013), 082, 43 pages | 10.3842/SIGMA.2013.082 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/3.0/ | The mathematical structure of homogeneous loop quantum cosmology is analyzed,
starting with and taking into account the general classification of homogeneous
connections not restricted to be Abelian. As a first consequence, it is seen
that the usual approach of quantizing Abelian models using spaces of functions
on t... | [
{
"created": "Tue, 26 Jun 2012 19:19:35 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Jul 2013 18:50:44 GMT",
"version": "v2"
},
{
"created": "Mon, 30 Dec 2013 06:12:07 GMT",
"version": "v3"
}
] | 2013-12-31 | [
[
"Bojowald",
"Martin",
""
]
] | The mathematical structure of homogeneous loop quantum cosmology is analyzed, starting with and taking into account the general classification of homogeneous connections not restricted to be Abelian. As a first consequence, it is seen that the usual approach of quantizing Abelian models using spaces of functions on the... |
1911.02179 | Ryotaro Kase | Ryotaro Kase and Shinji Tsujikawa | Weak cosmic growth in coupled dark energy with a Lagrangian formulation | 15 pages, 2 figures, published version | Phys. Lett. B 804, 135400 (2020) | 10.1016/j.physletb.2020.135400 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a dark energy scenario in which a canonical scalar field
$\phi$ is coupled to the four velocity $u_{c}^{\mu}$ of cold dark matter (CDM)
through a derivative interaction $u_{c}^{\mu} \partial_{\mu} \phi$. The
coupling is described by an interacting Lagrangian $f(X, Z)$, where $f$ depends
on $X=-\partial... | [
{
"created": "Wed, 6 Nov 2019 03:23:53 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Mar 2020 08:08:13 GMT",
"version": "v2"
},
{
"created": "Fri, 10 Apr 2020 04:42:10 GMT",
"version": "v3"
}
] | 2020-04-13 | [
[
"Kase",
"Ryotaro",
""
],
[
"Tsujikawa",
"Shinji",
""
]
] | We investigate a dark energy scenario in which a canonical scalar field $\phi$ is coupled to the four velocity $u_{c}^{\mu}$ of cold dark matter (CDM) through a derivative interaction $u_{c}^{\mu} \partial_{\mu} \phi$. The coupling is described by an interacting Lagrangian $f(X, Z)$, where $f$ depends on $X=-\partial^{... |
2204.06374 | Yakov Shnir | Yakov Shnir | Boson Stars | 16 pages, 7 figures. Invited contribution to the forthcoming book
"Modified and Quantum Gravity - From theory to experimental searches on all
scales", Springer Nature, Eds C. L\"ammerzahl and C. Pfeifer | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review particle-like configurations of complex scalar field, localized by
gravity, so-called boson stars. In the simplest case, these solutions posses
spherical symmetry, they may arise in the massive Einstein-Klein-Gordon theory
with global $U(1)$ symmetry, as gravitationally bounded lumps of scalar
condensate. F... | [
{
"created": "Wed, 13 Apr 2022 13:31:48 GMT",
"version": "v1"
}
] | 2022-04-14 | [
[
"Shnir",
"Yakov",
""
]
] | We review particle-like configurations of complex scalar field, localized by gravity, so-called boson stars. In the simplest case, these solutions posses spherical symmetry, they may arise in the massive Einstein-Klein-Gordon theory with global $U(1)$ symmetry, as gravitationally bounded lumps of scalar condensate. Fur... |
gr-qc/9302014 | Robert Brandenberger | Robert H. Brandenberger (Brown University) | Towards a Nonsingular Universe | 9 pages, 2 figures (available from the author), uses phyzzx,
BROWN-HET-890 | null | 10.1111/j.1749-6632.1993.tb43916.x | null | gr-qc astro-ph hep-th | null | A unified theory of all forces should be nonsingular. In such a unified
theory, Einstein's general relativity will be a very low curvature effective
theory. At larger curvatures, new terms will become important. The question
then arises as to whether it is possible to construct an effective action for
gravity which l... | [
{
"created": "Thu, 11 Feb 1993 03:09:27 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Brandenberger",
"Robert H.",
"",
"Brown University"
]
] | A unified theory of all forces should be nonsingular. In such a unified theory, Einstein's general relativity will be a very low curvature effective theory. At larger curvatures, new terms will become important. The question then arises as to whether it is possible to construct an effective action for gravity which lea... |
1505.00740 | Abhik Kumar Sanyal Dr. | Soumendranath Ruz, Kaushik Sarkar, Nayem Sk, Abhik Kumar Sanyal | Validating variational principle for higher order theory of gravity | 5 pages, To appear in Modern Physics Letters A | null | 10.1142/S0217732315501199 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Metric variation of higher order theory of gravity requires to fix the Ricci
scalar in addition to the metric tensor at the boundary. Fixing Ricci scalar at
the boundary implies that the classical solutions are fixed once and forever to
the de-Sitter or anti de-Sitter solutions. Here, we justify such requirement
from... | [
{
"created": "Fri, 1 May 2015 10:17:21 GMT",
"version": "v1"
}
] | 2015-08-19 | [
[
"Ruz",
"Soumendranath",
""
],
[
"Sarkar",
"Kaushik",
""
],
[
"Sk",
"Nayem",
""
],
[
"Sanyal",
"Abhik Kumar",
""
]
] | Metric variation of higher order theory of gravity requires to fix the Ricci scalar in addition to the metric tensor at the boundary. Fixing Ricci scalar at the boundary implies that the classical solutions are fixed once and forever to the de-Sitter or anti de-Sitter solutions. Here, we justify such requirement from t... |
1608.02783 | Tiberiu Harko | Bogdan Danila, Tiberiu Harko, Francisco S. N. Lobo, M. K. Mak | Hybrid metric-Palatini stars | 21 pages, 11 figures; major revisions; accepted for publication in
PRD | Phys. Rev. D 95, 044031 (2017) | 10.1103/PhysRevD.95.044031 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the internal structure and the physical properties of specific
classes of neutron, quark and Bose-Einstein Condensate stars in the hybrid
metric-Palatini gravity theory, which is a combination of the metric and
Palatini $f(R)$ formalisms. The theory is very successful in accounting for the
observed phenom... | [
{
"created": "Tue, 9 Aug 2016 12:23:52 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jan 2017 16:52:51 GMT",
"version": "v2"
}
] | 2017-02-24 | [
[
"Danila",
"Bogdan",
""
],
[
"Harko",
"Tiberiu",
""
],
[
"Lobo",
"Francisco S. N.",
""
],
[
"Mak",
"M. K.",
""
]
] | We consider the internal structure and the physical properties of specific classes of neutron, quark and Bose-Einstein Condensate stars in the hybrid metric-Palatini gravity theory, which is a combination of the metric and Palatini $f(R)$ formalisms. The theory is very successful in accounting for the observed phenomen... |
2001.02788 | Paul Chesler | Paul M. Chesler | Numerical evolution of the interior geometry of charged black holes | 11 pages, 8 figures. v2: Clarifications made to introduction and
discussion sections. Added discussion concerning critical spacelike
singularity formation. Published version | null | 10.1007/s10714-021-02853-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Previously, we developed a late time approximation scheme to study the
interior geometry of black holes. In the present paper we test this scheme with
numerical relativity simulations. In particular, we present numerical
relativity simulations of the interior geometry of charged spherically
symmetric two-sided black ... | [
{
"created": "Thu, 9 Jan 2020 00:20:15 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Sep 2021 02:22:32 GMT",
"version": "v2"
}
] | 2021-09-15 | [
[
"Chesler",
"Paul M.",
""
]
] | Previously, we developed a late time approximation scheme to study the interior geometry of black holes. In the present paper we test this scheme with numerical relativity simulations. In particular, we present numerical relativity simulations of the interior geometry of charged spherically symmetric two-sided black ho... |
gr-qc/0212116 | Bijan Saha | Bijan Saha (LIT, Jinr) | Spinor field with induced nonlinearity in a Bianchi type-I Universe | RevTex, 16 pages, 8 figures | null | null | null | gr-qc | null | Self-consistent solutions to the spinor, scalar and BI gravitational field
equations are obtained. The problems of initial singularity and asymptotically
isotropization process of the initially anisotropic space-time are studied. It
is also shown that the introduction of the Cosmological constant
($\Lambda$-term) in ... | [
{
"created": "Fri, 27 Dec 2002 13:28:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Saha",
"Bijan",
"",
"LIT, Jinr"
]
] | Self-consistent solutions to the spinor, scalar and BI gravitational field equations are obtained. The problems of initial singularity and asymptotically isotropization process of the initially anisotropic space-time are studied. It is also shown that the introduction of the Cosmological constant ($\Lambda$-term) in th... |
2302.00028 | Ra\'ul Carballo-Rubio | Ra\'ul Carballo-Rubio, Francesco Di Filippo, Stefano Liberati and Matt
Visser | Singularity-free gravitational collapse: From regular black holes to
horizonless objects | 36 pages, 11 figures; invited chapter to appear in the book ''Regular
Black Holes: Towards a New Paradigm of the Gravitational Collapse'' | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Penrose's singularity theorem implies that if a trapped region forms in a
gravitational collapse, then a singularity must form as well within such
region. However, it is widely expected that singularities should be generically
avoided by quantum gravitational effects. Here we shall explore both the
minimum requiremen... | [
{
"created": "Tue, 31 Jan 2023 19:01:11 GMT",
"version": "v1"
}
] | 2023-02-02 | [
[
"Carballo-Rubio",
"Raúl",
""
],
[
"Di Filippo",
"Francesco",
""
],
[
"Liberati",
"Stefano",
""
],
[
"Visser",
"Matt",
""
]
] | Penrose's singularity theorem implies that if a trapped region forms in a gravitational collapse, then a singularity must form as well within such region. However, it is widely expected that singularities should be generically avoided by quantum gravitational effects. Here we shall explore both the minimum requirements... |
gr-qc/0403004 | Hans Westman F. | Rickard Jonsson, Hans Westman | Generalizing Optical Geometry | 19 pages, 1 figure. A more general analysis is presented than in the
former version. See also the companion papers arXiv:0708.2493,
arXiv:0708.2533 and arXiv:0708.2537 | Class. Quantum Grav. 23 (2006) 61 | 10.1088/0264-9381/23/1/003 | null | gr-qc | null | We show that by employing the standard projected curvature as a measure of
spatial curvature, we can make a certain generalization of optical geometry
(Abramowicz and Lasota 1997, Class. Quantum Grav. 14 (1997) A23). This
generalization applies to any spacetime that admits a hypersurface orthogonal
shearfree congruen... | [
{
"created": "Sun, 29 Feb 2004 04:35:16 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Aug 2007 18:47:16 GMT",
"version": "v2"
}
] | 2007-08-21 | [
[
"Jonsson",
"Rickard",
""
],
[
"Westman",
"Hans",
""
]
] | We show that by employing the standard projected curvature as a measure of spatial curvature, we can make a certain generalization of optical geometry (Abramowicz and Lasota 1997, Class. Quantum Grav. 14 (1997) A23). This generalization applies to any spacetime that admits a hypersurface orthogonal shearfree congruence... |
1001.2748 | Simone Speziale | Laurent Freidel and Simone Speziale | Twisted geometries: A geometric parametrisation of SU(2) phase space | 28 pages. v2 and v3 minor changes | Phys.Rev.D82:084040,2010 | 10.1103/PhysRevD.82.084040 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A cornerstone of the loop quantum gravity program is the fact that the phase
space of general relativity on a fixed graph can be described by a product of
SU(2) cotangent bundles per edge. In this paper we show how to parametrize this
phase space in terms of quantities describing the intrinsic and extrinsic
geometry ... | [
{
"created": "Fri, 15 Jan 2010 17:55:14 GMT",
"version": "v1"
},
{
"created": "Mon, 17 May 2010 17:28:13 GMT",
"version": "v2"
},
{
"created": "Mon, 20 Sep 2010 08:29:11 GMT",
"version": "v3"
}
] | 2010-11-11 | [
[
"Freidel",
"Laurent",
""
],
[
"Speziale",
"Simone",
""
]
] | A cornerstone of the loop quantum gravity program is the fact that the phase space of general relativity on a fixed graph can be described by a product of SU(2) cotangent bundles per edge. In this paper we show how to parametrize this phase space in terms of quantities describing the intrinsic and extrinsic geometry of... |
2312.14080 | Francisco Lobo | David S. Pereira, Jo\~ao Ferraz, Francisco S. N. Lobo, Jos\'e P.
Mimoso | Baryogenesis: A Symmetry Breaking in the Primordial Universe Revisited | 29 pages. Published version in Symmetry of an invited contribution to
the Special Issue "Physics and Symmetry Section: Feature Papers 2023" | Symmetry 16, 13 (2024) | 10.3390/sym16010013 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this review article, we revisit the topic of baryogenesis, which is the
physical process that generated the observed baryon asymmetry during the first
stages of the primordial Universe. A viable theoretical explanation to
understand and investigate the mechanisms underlying baryogenesis must always
ensure that the... | [
{
"created": "Thu, 21 Dec 2023 17:58:13 GMT",
"version": "v1"
}
] | 2023-12-22 | [
[
"Pereira",
"David S.",
""
],
[
"Ferraz",
"João",
""
],
[
"Lobo",
"Francisco S. N.",
""
],
[
"Mimoso",
"José P.",
""
]
] | In this review article, we revisit the topic of baryogenesis, which is the physical process that generated the observed baryon asymmetry during the first stages of the primordial Universe. A viable theoretical explanation to understand and investigate the mechanisms underlying baryogenesis must always ensure that the S... |
1812.03480 | Milovan Vasilic | Milovan Vasilic | Gravitational acceleration in a class of geometric sigma models | 22 pages, 1 figure | Phys. Rev. D 99, 024038 (2019) | 10.1103/PhysRevD.99.024038 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, I examine spherically symmetric solutions in geometric sigma
models with four scalar fields. This class of models turns out to be a subclass
of the wider class of scalar-vector-tensor theories of gravity. The purpose of
the present study is to examine how the additional four degrees of freedom
modify Ne... | [
{
"created": "Sun, 9 Dec 2018 13:09:26 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jan 2019 21:19:05 GMT",
"version": "v2"
}
] | 2019-02-06 | [
[
"Vasilic",
"Milovan",
""
]
] | In this work, I examine spherically symmetric solutions in geometric sigma models with four scalar fields. This class of models turns out to be a subclass of the wider class of scalar-vector-tensor theories of gravity. The purpose of the present study is to examine how the additional four degrees of freedom modify Newt... |
1807.05659 | Jiun-Huei Proty Wu | Wen-Hsuan Lucky Chang and Jiun-Huei Proty Wu | Time Asymmetry of Cosmic Background Evolution in Loop Quantum Cosmology | 7 pages, with 7 figures and 4 tables | Phys. Rev. D 99, 123528 (2019) | 10.1103/PhysRevD.99.123528 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the asymmetry of cosmic background evolution in time with respect
to the quantum bounce in the Loop Quantum Cosmology (LQC), employing the value
of scalar field at the bounce $\phi_{\rm B}$. We use the Chaotic and the $R^2$
potentials to demonstrate that a possible deflation before the bounce may
counterac... | [
{
"created": "Mon, 16 Jul 2018 02:34:55 GMT",
"version": "v1"
},
{
"created": "Sun, 9 Jun 2019 20:23:04 GMT",
"version": "v2"
}
] | 2019-07-03 | [
[
"Chang",
"Wen-Hsuan Lucky",
""
],
[
"Wu",
"Jiun-Huei Proty",
""
]
] | We discuss the asymmetry of cosmic background evolution in time with respect to the quantum bounce in the Loop Quantum Cosmology (LQC), employing the value of scalar field at the bounce $\phi_{\rm B}$. We use the Chaotic and the $R^2$ potentials to demonstrate that a possible deflation before the bounce may counteract ... |
1505.04534 | Kei Yamada | Kei Yamada, Takuya Tsuchiya, Hideki Asada | Post-Newtonian effects on the stability of the triangular solution in
the three-body problem for general masses | 23 pages, 4 figures; accepted by PRD | Phys. Rev. D 91 : 124016 (2015) | 10.1103/PhysRevD.91.124016 | null | gr-qc astro-ph.EP math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Continuing work initiated in earlier publications [Ichita, Yamada and Asada,
Phys. Rev. D {\bf 83}, 084026 (2011); Yamada and Asada, Phys. Rev. D {\bf 86},
124029 (2012)], we examine the post-Newtonian (PN) effects on the stability of
the triangular solution in the relativistic three-body problem for general
masses. ... | [
{
"created": "Mon, 18 May 2015 07:41:01 GMT",
"version": "v1"
}
] | 2015-06-08 | [
[
"Yamada",
"Kei",
""
],
[
"Tsuchiya",
"Takuya",
""
],
[
"Asada",
"Hideki",
""
]
] | Continuing work initiated in earlier publications [Ichita, Yamada and Asada, Phys. Rev. D {\bf 83}, 084026 (2011); Yamada and Asada, Phys. Rev. D {\bf 86}, 124029 (2012)], we examine the post-Newtonian (PN) effects on the stability of the triangular solution in the relativistic three-body problem for general masses. Fo... |
2004.06000 | Ines Godonou Salako | Maxime Z. Arouko, Ines G. Salako, A. D. Kanfon, M. J. S. Houndjo,
Etienne Baffou | Rip cosmologies, Wormhole Solutions and Big Trip in the
$f(T,\mathcal{T})$ theory of gravity | arXiv admin note: text overlap with arXiv:1904.01443 by other authors | null | 10.1142/S0219887820501169 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Rip cosmological models have been investigated in the framework of
$f(T,\mathcal{T})$ theory of gravity, where $T$ denotes the torsion and
$\mathcal{T}$ is the trace of the energy-momentum tensor. These phantom
cosmological models revealed that at initial epoch a EoS parameter $\omega <-1$
and tends asymptotically at... | [
{
"created": "Mon, 6 Apr 2020 07:47:21 GMT",
"version": "v1"
}
] | 2020-09-02 | [
[
"Arouko",
"Maxime Z.",
""
],
[
"Salako",
"Ines G.",
""
],
[
"Kanfon",
"A. D.",
""
],
[
"Houndjo",
"M. J. S.",
""
],
[
"Baffou",
"Etienne",
""
]
] | Rip cosmological models have been investigated in the framework of $f(T,\mathcal{T})$ theory of gravity, where $T$ denotes the torsion and $\mathcal{T}$ is the trace of the energy-momentum tensor. These phantom cosmological models revealed that at initial epoch a EoS parameter $\omega <-1$ and tends asymptotically at l... |
1805.10642 | Li-Wei Ji | Li-Wei Ji, Rong-Gen Cai, Zhoujian Cao | Binary black hole simulation with an adaptive finite element method III:
Evolving a single black hole | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend a new finite element code, Einstein PHG (iPHG), to solve the
evolution part of Einstein equations in first-order GH formalism. This paper is
the third one of a systematic investigation of applying adaptive finite element
method to the Einstein equations, especially binary compact objects
simulations. The pr... | [
{
"created": "Sun, 27 May 2018 15:44:30 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Oct 2018 15:08:41 GMT",
"version": "v2"
}
] | 2018-10-18 | [
[
"Ji",
"Li-Wei",
""
],
[
"Cai",
"Rong-Gen",
""
],
[
"Cao",
"Zhoujian",
""
]
] | We extend a new finite element code, Einstein PHG (iPHG), to solve the evolution part of Einstein equations in first-order GH formalism. This paper is the third one of a systematic investigation of applying adaptive finite element method to the Einstein equations, especially binary compact objects simulations. The prim... |
1809.10360 | Fan Huang | Zu-Cheng Chen, Fan Huang and Qing-Guo Huang | Stochastic Gravitational-Wave Background from Binary Black Holes and
Binary Neutron Stars and Implications for LISA | 12 pages, 14 figures | null | 10.3847/1538-4357/aaf581 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The advent of gravitational wave (GW) and multi-messenger astronomy has
stimulated the research on the formation mechanisms of binary black holes
(BBHs) observed by LIGO/Virgo. In literature, the progenitors of these BBHs
could be stellar-origin black holes (sBHs) or primordial black holes (PBHs). In
this paper we ca... | [
{
"created": "Thu, 27 Sep 2018 06:14:41 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Mar 2019 14:58:11 GMT",
"version": "v2"
}
] | 2019-03-22 | [
[
"Chen",
"Zu-Cheng",
""
],
[
"Huang",
"Fan",
""
],
[
"Huang",
"Qing-Guo",
""
]
] | The advent of gravitational wave (GW) and multi-messenger astronomy has stimulated the research on the formation mechanisms of binary black holes (BBHs) observed by LIGO/Virgo. In literature, the progenitors of these BBHs could be stellar-origin black holes (sBHs) or primordial black holes (PBHs). In this paper we calc... |
2110.09640 | Willians Barreto | M. A. Alcoforado, W. O. Barreto, H. P. de Oliveira | The Bondi problem revisited: a spectral domain decomposition code | Revised version; 21 pages, 10 figures; to appear in Int. J. Modern
Phys. D | Int. J. Modern Phys. D, 2250028 (2022) | 10.1142/S0218271822500286 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We present a simple domain decomposition code based on the
Galerkin-Collocation method to integrate the field equations of the Bondi
problem. The algorithm is stable, exhibits exponential convergence when
considering the Bondi formula as an error measure, and is computationally
economical. We have incorporated featur... | [
{
"created": "Mon, 18 Oct 2021 22:24:07 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Dec 2021 19:39:04 GMT",
"version": "v2"
}
] | 2022-03-11 | [
[
"Alcoforado",
"M. A.",
""
],
[
"Barreto",
"W. O.",
""
],
[
"de Oliveira",
"H. P.",
""
]
] | We present a simple domain decomposition code based on the Galerkin-Collocation method to integrate the field equations of the Bondi problem. The algorithm is stable, exhibits exponential convergence when considering the Bondi formula as an error measure, and is computationally economical. We have incorporated features... |
gr-qc/0402079 | Jose M. Martin-Garcia | Carsten Gundlach, Jose M. Martin-Garcia | Symmetric hyperbolic form of systems of second-order evolution equations
subject to constraints | 13 pages, revtex4 | Phys.Rev. D70 (2004) 044031 | 10.1103/PhysRevD.70.044031 | null | gr-qc | null | Motivated by the initial-boundary value problem for the Einstein equations,
we propose a definition of symmetric hyperbolicity for systems of evolution
equations that are first order in time but second order in space. This can be
used to impose constraint-preserving boundary conditions. The general methods
are illust... | [
{
"created": "Wed, 18 Feb 2004 13:50:38 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Gundlach",
"Carsten",
""
],
[
"Martin-Garcia",
"Jose M.",
""
]
] | Motivated by the initial-boundary value problem for the Einstein equations, we propose a definition of symmetric hyperbolicity for systems of evolution equations that are first order in time but second order in space. This can be used to impose constraint-preserving boundary conditions. The general methods are illustra... |
1508.07263 | Jose Ademir Sales Lima | J. A. S. Lima, R. C. Santos, J. V. Cunha | Is $\Lambda$CDM an effective CCDM cosmology? | 6 pages, 2 figures, changes in the abstract, introduction, new
references and typo corrections | null | 10.1088/1475-7516/2016/03/027 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that a cosmology driven by gravitationally induced particle
production of all non-relativistic species existing in the present Universe
mimics exactly the observed flat accelerating $\Lambda$CDM cosmology with just
one dynamical free parameter. This kind of scenario includes the creation cold
dark matter (CCD... | [
{
"created": "Thu, 27 Aug 2015 01:34:27 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Feb 2016 07:58:42 GMT",
"version": "v2"
}
] | 2016-03-23 | [
[
"Lima",
"J. A. S.",
""
],
[
"Santos",
"R. C.",
""
],
[
"Cunha",
"J. V.",
""
]
] | We show that a cosmology driven by gravitationally induced particle production of all non-relativistic species existing in the present Universe mimics exactly the observed flat accelerating $\Lambda$CDM cosmology with just one dynamical free parameter. This kind of scenario includes the creation cold dark matter (CCDM)... |
1307.4371 | Marc Mars | Marc Mars, Filipe C. Mena, Ra\"ul Vera | Review on exact and perturbative deformations of the Einstein-Straus
model: uniqueness and rigidity results | 29 pages, 1 figure | null | 10.1007/s10714-013-1574-1 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Einstein-Straus model consists of a Schwarzschild spherical vacuole in a
Friedman-Lema\^{\i}tre-Robertson-Walker (FLRW) dust spacetime (with or without
\Lambda). It constitutes the most widely accepted model to answer the question
of the influence of large scale (cosmological) dynamics on local systems. The
concl... | [
{
"created": "Tue, 16 Jul 2013 18:43:06 GMT",
"version": "v1"
}
] | 2015-06-16 | [
[
"Mars",
"Marc",
""
],
[
"Mena",
"Filipe C.",
""
],
[
"Vera",
"Raül",
""
]
] | The Einstein-Straus model consists of a Schwarzschild spherical vacuole in a Friedman-Lema\^{\i}tre-Robertson-Walker (FLRW) dust spacetime (with or without \Lambda). It constitutes the most widely accepted model to answer the question of the influence of large scale (cosmological) dynamics on local systems. The conclus... |
1712.08972 | Thomas Zannias | Francisco Astorga, J. Felix Salazar and Thomas Zannias | On the Integrability of the Geodesic Flow on a
Friedmann-Robertson-Walker Spacetime | 34 pages, no figures | Phys. Scr. 93, 085205, (2018) | 10.1088/1402-4896/aacd44 | null | gr-qc physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the geodesic flow on the cotangent bundle of a
Friedman-Robertson-Walker spacetime (M, g). On this bundle, the HamiltonJacobi
equation is completely separable and this separability leads us to construct
four linearly independent integrals in involution i.e. Poisson commuting
amongst themselves and pointwise ... | [
{
"created": "Sun, 24 Dec 2017 22:39:17 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Dec 2018 20:00:28 GMT",
"version": "v2"
}
] | 2018-12-27 | [
[
"Astorga",
"Francisco",
""
],
[
"Salazar",
"J. Felix",
""
],
[
"Zannias",
"Thomas",
""
]
] | We study the geodesic flow on the cotangent bundle of a Friedman-Robertson-Walker spacetime (M, g). On this bundle, the HamiltonJacobi equation is completely separable and this separability leads us to construct four linearly independent integrals in involution i.e. Poisson commuting amongst themselves and pointwise li... |
1901.10828 | Young-Hwan Hyun | Young-Hwan Hyun, Yoonbai Kim, Seong Chan Park | Exact Greybody Factors for the Brane Scalar Field of Five-dimensional
Rotating Black Holes | 18 pages, 2 figures | JHEP06(2019)041 | 10.1007/JHEP06(2019)041 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study scalar perturbations of the five-dimensional rotating black holes
and find an exact solution giving exact description of the Hawking radiation.
Mathematically, the full solution for this s-wave mode is expressed in terms of
the prolate spheroidal wave function with complex parameters. By using the
spheroidal... | [
{
"created": "Wed, 30 Jan 2019 13:57:41 GMT",
"version": "v1"
}
] | 2019-06-14 | [
[
"Hyun",
"Young-Hwan",
""
],
[
"Kim",
"Yoonbai",
""
],
[
"Park",
"Seong Chan",
""
]
] | We study scalar perturbations of the five-dimensional rotating black holes and find an exact solution giving exact description of the Hawking radiation. Mathematically, the full solution for this s-wave mode is expressed in terms of the prolate spheroidal wave function with complex parameters. By using the spheroidal j... |
1309.7271 | Ezra Newman | Ezra Newman | A Fundamental Solution to the CCC equation | 13 pages, research article | null | 10.1007/s10714-014-1717-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We display a simple solution to the Penrose CCC scenario. For this solution
we chose for the late stages of the previous aeon a FRW, k=0, universe with a
both a cosmological constant and radiation (no mass) while for the early stages
of the 'present' aeon we have again a FRW universe, k=0, with the same
cosmological ... | [
{
"created": "Fri, 27 Sep 2013 15:20:12 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Newman",
"Ezra",
""
]
] | We display a simple solution to the Penrose CCC scenario. For this solution we chose for the late stages of the previous aeon a FRW, k=0, universe with a both a cosmological constant and radiation (no mass) while for the early stages of the 'present' aeon we have again a FRW universe, k=0, with the same cosmological co... |
gr-qc/0004009 | Luc Blanchet | Luc Blanchet and Guillaume Faye | On the equations of motion of point-particle binaries at the third
post-Newtonian order | 12 pages, to appear in Physics Letters A, minor changes included | Phys.Lett. A271 (2000) 58 | 10.1016/S0375-9601(00)00360-1 | null | gr-qc | null | We investigate the dynamics of two point-like particles through the third
post-Newtonian (3PN) approximation of general relativity. The infinite
self-field of each point-mass is regularized by means of Hadamard's concept of
``partie finie''. Distributional forms associated with the regularization are
used systematica... | [
{
"created": "Mon, 3 Apr 2000 21:01:59 GMT",
"version": "v1"
},
{
"created": "Mon, 22 May 2000 09:54:14 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Blanchet",
"Luc",
""
],
[
"Faye",
"Guillaume",
""
]
] | We investigate the dynamics of two point-like particles through the third post-Newtonian (3PN) approximation of general relativity. The infinite self-field of each point-mass is regularized by means of Hadamard's concept of ``partie finie''. Distributional forms associated with the regularization are used systematicall... |
1511.06273 | Hooman Moradpour Hooman | H. Moradpour, M. T. Mohammadi Sabet | Thermodynamic descriptions of Polytropic gas and its viscous type as the
dark energy candidates | 13 pages, Can. J. Phys. (2016) | Can. J. Phys.94.1 (2016) | 10.1139/cjp-2015-0718 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, at first, we focus on a FRW universe in which the dark energy
candidate satisfies the Polytropic equation of state and study thermodynamics
of dark energy. Bearing the thermal fluctuation theorem in mind, we establish a
relation between the thermal fluctuation of system and mutual interaction
between t... | [
{
"created": "Wed, 18 Nov 2015 08:54:14 GMT",
"version": "v1"
},
{
"created": "Sat, 19 Dec 2015 09:33:08 GMT",
"version": "v2"
},
{
"created": "Fri, 19 Feb 2016 12:44:35 GMT",
"version": "v3"
}
] | 2016-06-07 | [
[
"Moradpour",
"H.",
""
],
[
"Sabet",
"M. T. Mohammadi",
""
]
] | In this paper, at first, we focus on a FRW universe in which the dark energy candidate satisfies the Polytropic equation of state and study thermodynamics of dark energy. Bearing the thermal fluctuation theorem in mind, we establish a relation between the thermal fluctuation of system and mutual interaction between the... |
0910.4693 | Franco Fiorini | Rafael Ferraro and Franco Fiorini | Born-Infeld Determinantal gravity and the taming of the conical
singularity in 3-dimensional spacetime | 6 pages, 2 figures. References added, some discussions improved.
Version accepted in Phys. Lett. B | Phys.Lett.B692:206-211,2010 | 10.1016/j.physletb.2010.07.040 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of Born-Infeld \emph{determinantal} gravity formulated in a
n-dimensional spacetime with absolute parallelism, we found an exact
3-dimensional \emph{vacuum} circular symmetric solution without cosmological
constant consisting in a rotating spacetime with non singular behavior. The
space behaves at infi... | [
{
"created": "Sun, 25 Oct 2009 01:11:10 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Aug 2010 06:13:30 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Ferraro",
"Rafael",
""
],
[
"Fiorini",
"Franco",
""
]
] | In the context of Born-Infeld \emph{determinantal} gravity formulated in a n-dimensional spacetime with absolute parallelism, we found an exact 3-dimensional \emph{vacuum} circular symmetric solution without cosmological constant consisting in a rotating spacetime with non singular behavior. The space behaves at infini... |
gr-qc/0406068 | Alberto Saa | Edgard Gunzig and Alberto Saa | Quantum effects and superquintessence in the new age of precision
cosmology | 7 pages. Essay selected for "Honorable Mention" in the 2004 Awards
for Essays on Gravitation, Gravity Research Foundation | Int.J.Mod.Phys.D13:2255-2260,2004 | 10.1142/S0218271804006292 | null | gr-qc | null | Recent observations of Type Ia supernova at high redshifts establish that the
dark energy component of the universe has (a probably constant) ratio between
pressure and energy density $w=p/\rho=-1.02(^{+0.13}_{-0.19})$. The
conventional quintessence models for dark energy are restricted to the range
$-1\le w < 0$, wi... | [
{
"created": "Thu, 17 Jun 2004 01:25:17 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Gunzig",
"Edgard",
""
],
[
"Saa",
"Alberto",
""
]
] | Recent observations of Type Ia supernova at high redshifts establish that the dark energy component of the universe has (a probably constant) ratio between pressure and energy density $w=p/\rho=-1.02(^{+0.13}_{-0.19})$. The conventional quintessence models for dark energy are restricted to the range $-1\le w < 0$, with... |
1412.4765 | Eric Gourgoulhon | Eric Gourgoulhon, Michal Bejger, Marco Mancini | Tensor calculus with open-source software: the SageManifolds project | 17 pages, 6 figures, many small changes w.r.t. v1; to appear in the
Proceedings of "ERE2014: Almost 100 years after Einstein's revolution"
(Journal of Physics: Conference Series) | Journal of Physics: Conference Series 600, 012002 (2015) | 10.1088/1742-6596/600/1/012002 | null | gr-qc hep-th math-ph math.MP | http://creativecommons.org/licenses/by-nc-sa/3.0/ | The SageManifolds project aims at extending the mathematics software system
Sage towards differential geometry and tensor calculus. Like Sage,
SageManifolds is free, open-source and is based on the Python programming
language. We discuss here some details of the implementation, which relies on
Sage's parent/element f... | [
{
"created": "Mon, 15 Dec 2014 20:58:32 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Dec 2014 11:22:40 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Gourgoulhon",
"Eric",
""
],
[
"Bejger",
"Michal",
""
],
[
"Mancini",
"Marco",
""
]
] | The SageManifolds project aims at extending the mathematics software system Sage towards differential geometry and tensor calculus. Like Sage, SageManifolds is free, open-source and is based on the Python programming language. We discuss here some details of the implementation, which relies on Sage's parent/element fra... |
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