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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0706.1258 | Frank Reifler | Frank Reifler and Randall Morris | Hestenes' Tetrad and Spin Connections | null | Int.J.Theor.Phys.44:1307-1324,2005 | 10.1007/s10773-005-4688-8 | null | gr-qc math-ph math.MP quant-ph | null | Defining a spin connection is necessary for formulating Dirac's bispinor
equation in a curved space-time. Hestenes has shown that a bispinor field is
equivalent to an orthonormal tetrad of vector fields together with a complex
scalar field. In this paper, we show that using Hestenes' tetrad for the spin
connection in... | [
{
"created": "Fri, 8 Jun 2007 21:21:04 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Reifler",
"Frank",
""
],
[
"Morris",
"Randall",
""
]
] | Defining a spin connection is necessary for formulating Dirac's bispinor equation in a curved space-time. Hestenes has shown that a bispinor field is equivalent to an orthonormal tetrad of vector fields together with a complex scalar field. In this paper, we show that using Hestenes' tetrad for the spin connection in a... |
2208.04552 | Andreas Maier | J. Bl\"umlein, A. Maier, P. Marquard, G. Sch\"afer | Gravity in binary systems at the fifth and sixth post-Newtonian order | 10 pages, 1 figure. Contribution to the proceedings of Loops and Legs
in Quantum Field Theory - LL2022 | null | null | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Binary sources of gravitational waves in the early inspiral phase are
accurately described by a post-Newtonian expansion in small velocity and weak
interaction. We compute the conservative dynamics to fifth and partial sixth
order using a non-relativistic effective field theory. We give predictions for
central observ... | [
{
"created": "Tue, 9 Aug 2022 06:00:58 GMT",
"version": "v1"
}
] | 2022-08-10 | [
[
"Blümlein",
"J.",
""
],
[
"Maier",
"A.",
""
],
[
"Marquard",
"P.",
""
],
[
"Schäfer",
"G.",
""
]
] | Binary sources of gravitational waves in the early inspiral phase are accurately described by a post-Newtonian expansion in small velocity and weak interaction. We compute the conservative dynamics to fifth and partial sixth order using a non-relativistic effective field theory. We give predictions for central observab... |
2211.15668 | Kazuhiro Agatsuma | Kazuhiro Agatsuma | Four hints and test candidates of the local cosmic expansion | 5 pages, 1 figure | Physics of the Dark Universe, Volume 38, 2022, 101134 | 10.1016/j.dark.2022.101134 | null | gr-qc astro-ph.CO astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | The expansion of the universe on short distance scales is a new frontier to
investigate the dark energy. The excess orbital decay in binary pulsars may be
related to acceleration by the local cosmic expansion, called the cosmic drag.
Modern observations of two independent binaries (PSR B1534+12 and PSR B1913+16)
supp... | [
{
"created": "Sat, 26 Nov 2022 07:18:40 GMT",
"version": "v1"
}
] | 2022-11-30 | [
[
"Agatsuma",
"Kazuhiro",
""
]
] | The expansion of the universe on short distance scales is a new frontier to investigate the dark energy. The excess orbital decay in binary pulsars may be related to acceleration by the local cosmic expansion, called the cosmic drag. Modern observations of two independent binaries (PSR B1534+12 and PSR B1913+16) suppor... |
1005.2501 | Mehrdad Farhoudi Dr. | Amir F. Bahrehbakhsh, Mehrdad Farhoudi and Hossein Shojaie | FRW Cosmology From Five Dimensional Vacuum Brans-Dicke Theory | 18 pages, 16 figures, 11 tables | Gen.Rel.Grav.43:847-869,2011 | 10.1007/s10714-010-1101-6 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We follow approach of induced matter theory for 5D vacuum BD, introduce
induced matter and potential in 4D hypersurfaces, and employ generalized FRW
type solution. We confine ourselves to scalar field and scale factors be
functions of the time. This makes the induced potential, by its definition,
vanishes. When the s... | [
{
"created": "Fri, 14 May 2010 11:18:45 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Oct 2010 12:15:18 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Bahrehbakhsh",
"Amir F.",
""
],
[
"Farhoudi",
"Mehrdad",
""
],
[
"Shojaie",
"Hossein",
""
]
] | We follow approach of induced matter theory for 5D vacuum BD, introduce induced matter and potential in 4D hypersurfaces, and employ generalized FRW type solution. We confine ourselves to scalar field and scale factors be functions of the time. This makes the induced potential, by its definition, vanishes. When the sca... |
1211.3592 | Dongsu Bak | Dongsu Bak | Entropy of universe as entanglement entropy | 15 pages, 3 figures, references added, version to appear plb | null | 10.1016/j.physletb.2013.03.023 | UOSTP 121201 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We note that the observable part of universe at a certain time t_P is
necessarily limited, when there is a beginning of universe. We argue that an
appropriate spacetime region associated with an observer from tI to t_P is the
causal diamond which is the overlap of the past/future of the observer at
t_P/t_I respective... | [
{
"created": "Thu, 15 Nov 2012 12:42:09 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Nov 2012 11:28:57 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Mar 2013 06:58:16 GMT",
"version": "v3"
}
] | 2015-06-12 | [
[
"Bak",
"Dongsu",
""
]
] | We note that the observable part of universe at a certain time t_P is necessarily limited, when there is a beginning of universe. We argue that an appropriate spacetime region associated with an observer from tI to t_P is the causal diamond which is the overlap of the past/future of the observer at t_P/t_I respectively... |
gr-qc/9403016 | Jennie Traschen | Jennie Traschen | Discrete Self-Similiarity and Critical Point Behavior in Fluctuations
About Extremal Black Holes | 12 pages (harvmac), UMHEP-405 | Phys. Rev. D 50, 7144 (1994) | 10.1103/PhysRevD.50.7144 | null | gr-qc | null | The issues of scaling symmetry and critical point behavior are studied for
fluctuations about extremal charged black holes. We consider the scattering and
capture of the spherically symmetric mode of a charged, massive test field on
the background spacetime of a black hole with charge $Q$ and mass $M$. The
spacetime ... | [
{
"created": "Wed, 9 Mar 1994 17:30:39 GMT",
"version": "v1"
}
] | 2013-11-13 | [
[
"Traschen",
"Jennie",
""
]
] | The issues of scaling symmetry and critical point behavior are studied for fluctuations about extremal charged black holes. We consider the scattering and capture of the spherically symmetric mode of a charged, massive test field on the background spacetime of a black hole with charge $Q$ and mass $M$. The spacetime ge... |
2403.09910 | Pablo Andr\'es Lizardo Romo | Mario H. Amante, Andr\'es Lizardo, Javier Chagoya and C. Ortiz | Constraining modified gravity models through strong lensing cosmography | 18 pages, 8 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze cosmography as a tool to constrain modified gravity theories. We
take four distinct models and obtain their parameters in terms of the
cosmographic parameters favored by observational data of strong gravitational
lensing. We contrast with the values obtained by direct comparison between each
model and the ... | [
{
"created": "Thu, 14 Mar 2024 23:02:59 GMT",
"version": "v1"
}
] | 2024-03-18 | [
[
"Amante",
"Mario H.",
""
],
[
"Lizardo",
"Andrés",
""
],
[
"Chagoya",
"Javier",
""
],
[
"Ortiz",
"C.",
""
]
] | We analyze cosmography as a tool to constrain modified gravity theories. We take four distinct models and obtain their parameters in terms of the cosmographic parameters favored by observational data of strong gravitational lensing. We contrast with the values obtained by direct comparison between each model and the ob... |
1203.3382 | Ovidiu Cristinel Stoica | Ovidiu-Cristinel Stoica | On the Weyl Curvature Hypothesis | 10 pages, slides at
http://www.sciencedirect.com/science/article/pii/S0003491613001711 | Annals of Physics, Vol. 338, November 2013, Pages 186-194 | 10.1016/j.aop.2013.08.002 | null | gr-qc astro-ph.CO math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Weyl curvature hypothesis of Penrose attempts to explain the high
homogeneity and isotropy, and the very low entropy of the early universe, by
conjecturing the vanishing of the Weyl tensor at the Big-Bang singularity.
In previous papers it has been proposed an equivalent form of Einstein's
equation, which exten... | [
{
"created": "Thu, 15 Mar 2012 15:08:07 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jun 2012 15:20:55 GMT",
"version": "v2"
},
{
"created": "Mon, 18 Mar 2013 18:52:35 GMT",
"version": "v3"
},
{
"created": "Wed, 4 Sep 2013 20:21:28 GMT",
"version": "v4"
}
] | 2013-09-06 | [
[
"Stoica",
"Ovidiu-Cristinel",
""
]
] | The Weyl curvature hypothesis of Penrose attempts to explain the high homogeneity and isotropy, and the very low entropy of the early universe, by conjecturing the vanishing of the Weyl tensor at the Big-Bang singularity. In previous papers it has been proposed an equivalent form of Einstein's equation, which extends i... |
gr-qc/0502045 | John Klauder | J. Scott Little and John R. Klauder | Elementary Model of Constraint Quantization with an Anomaly | 14 pages, 2 figures | Phys.Rev. D71 (2005) 085014 | 10.1103/PhysRevD.71.085014 | null | gr-qc | null | Quantum gravity is made more difficult in part by its constraint structure.
The constraints are classically first-class; however, upon quantization they
become partially second-class. To study such behavior, we focus on a simple
problem with finitely many degrees of freedom and demonstrate how the
projection operator... | [
{
"created": "Thu, 10 Feb 2005 15:58:29 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Little",
"J. Scott",
""
],
[
"Klauder",
"John R.",
""
]
] | Quantum gravity is made more difficult in part by its constraint structure. The constraints are classically first-class; however, upon quantization they become partially second-class. To study such behavior, we focus on a simple problem with finitely many degrees of freedom and demonstrate how the projection operator f... |
1710.09705 | William J. Cunningham | William J. Cunningham | Inference of Boundaries in Causal Sets | 19 pages, 9 figures | W.J. Cunningham, Inference of Boundaries in Causal Sets, Class.
Quant. Grav. 35, 094002 (2018) | 10.1088/1361-6382/aaadc4 | null | gr-qc physics.comp-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the extrinsic geometry of causal sets in $(1+1)$-dimensional
Minkowski spacetime. The properties of boundaries in an embedding space can be
used not only to measure observables, but also to supplement the discrete
action in the partition function via discretized Gibbons-Hawking-York boundary
terms. We ... | [
{
"created": "Thu, 26 Oct 2017 14:00:53 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Jun 2018 13:57:16 GMT",
"version": "v2"
}
] | 2018-06-27 | [
[
"Cunningham",
"William J.",
""
]
] | We investigate the extrinsic geometry of causal sets in $(1+1)$-dimensional Minkowski spacetime. The properties of boundaries in an embedding space can be used not only to measure observables, but also to supplement the discrete action in the partition function via discretized Gibbons-Hawking-York boundary terms. We de... |
gr-qc/0012030 | Toyoki Matsuyama | M. Kenmoku, T. Matsuyama, R.Sato, and S. Uchida | Canonical Theory of 2+1 Gravity | 6 pages, talk given at LLWI-2000: From Particles to Universe,
Alberta, 20-26 February 2000 | null | 10.1142/9789812811752_0027 | null | gr-qc | null | Recently 2+1 dimensional gravity theory, especially ${\rm AdS_3}$ has been
studied extensively. It was shown to be equivalent to the 2+1 Chern-Simon
theory and has been investigated to understand the black hole thermodynamics,
i.e. Hawking temperature and others. The purpose of this report is to
investigate the canon... | [
{
"created": "Thu, 7 Dec 2000 09:15:03 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Kenmoku",
"M.",
""
],
[
"Matsuyama",
"T.",
""
],
[
"Sato",
"R.",
""
],
[
"Uchida",
"S.",
""
]
] | Recently 2+1 dimensional gravity theory, especially ${\rm AdS_3}$ has been studied extensively. It was shown to be equivalent to the 2+1 Chern-Simon theory and has been investigated to understand the black hole thermodynamics, i.e. Hawking temperature and others. The purpose of this report is to investigate the canonic... |
1603.03300 | Noah Sennett | Noah Sennett and Alessandra Buonanno | Modeling dynamical scalarization with a resummed post-Newtonian
expansion | 24 pages, 8 figures; recolored figures, fixed typos, added email | Phys. Rev. D 93, 124004 (2016) | 10.1103/PhysRevD.93.124004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Despite stringent constraints set by astrophysical observations, there remain
viable scalar-tensor theories that could be distinguished from general
relativity with gravitational-wave detectors. A promising signal predicted in
these alternative theories is dynamical scalarization, which can dramatically
affect the ev... | [
{
"created": "Thu, 10 Mar 2016 15:35:46 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Mar 2016 15:32:40 GMT",
"version": "v2"
}
] | 2017-10-11 | [
[
"Sennett",
"Noah",
""
],
[
"Buonanno",
"Alessandra",
""
]
] | Despite stringent constraints set by astrophysical observations, there remain viable scalar-tensor theories that could be distinguished from general relativity with gravitational-wave detectors. A promising signal predicted in these alternative theories is dynamical scalarization, which can dramatically affect the evol... |
0803.1286 | Lorenzo Iorio | Lorenzo Iorio | Mars and frame-dragging: study for a dedicated mission | LaTex2e, 16 pages, 5 figures, no tables. To appear in General
Relativity and Gravitation | Gen.Rel.Grav.41:1273-1284,2009 | 10.1007/s10714-008-0704-7 | null | gr-qc astro-ph physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we preliminarily explore the possibility of designing a
dedicated satellite-based mission to measure the general relativistic
gravitomagnetic Lense-Thirring effect in the gravitational field of Mars. The
focus is on the systematic error induced by the multipolar expansion of the
areopotential and on pos... | [
{
"created": "Mon, 10 Mar 2008 18:51:12 GMT",
"version": "v1"
},
{
"created": "Sat, 11 Oct 2008 18:42:34 GMT",
"version": "v2"
}
] | 2009-06-23 | [
[
"Iorio",
"Lorenzo",
""
]
] | In this paper we preliminarily explore the possibility of designing a dedicated satellite-based mission to measure the general relativistic gravitomagnetic Lense-Thirring effect in the gravitational field of Mars. The focus is on the systematic error induced by the multipolar expansion of the areopotential and on possi... |
1705.06036 | Carl Diether | Carl F. Diether III and Joy Christian | On the Role of Einstein-Cartan Gravity in Fundamental Particle Physics | 18 pages; No figure; Published version; For further details about our
results see http://einstein-cartan.org | Universe 2020, 6(8), 112 | 10.3390/universe6080112 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Two of the major open questions in particle physics are: (1) Why are the
elementary fermionic particles that are so far observed have such low
mass-energy compared to the Planck energy scale? And (2), what mechanical
energy may be counterbalancing the divergent electrostatic and strong force
energies of point-like ch... | [
{
"created": "Wed, 17 May 2017 07:41:01 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Jul 2017 20:46:06 GMT",
"version": "v2"
},
{
"created": "Sat, 29 Jul 2017 18:06:04 GMT",
"version": "v3"
},
{
"created": "Mon, 9 Jul 2018 06:56:21 GMT",
"version": "v4"
},
{
"cr... | 2022-02-13 | [
[
"Diether",
"Carl F.",
"III"
],
[
"Christian",
"Joy",
""
]
] | Two of the major open questions in particle physics are: (1) Why are the elementary fermionic particles that are so far observed have such low mass-energy compared to the Planck energy scale? And (2), what mechanical energy may be counterbalancing the divergent electrostatic and strong force energies of point-like char... |
1904.09053 | Sumanta Chakraborty | Sumanta Chakraborty, Dawood Kothawala and Alessandro Pesci | Raychaudhuri equation with zero point length | Revised Version, Published, 16 pages, no figures | Phys. Lett. B 797, 134877 (2019) | 10.1016/j.physletb.2019.134877 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Raychaudhuri equation for a geodesic congruence in the presence of a
zero-point length has been investigated. This is directly related to the
small-scale structure of spacetime and possibly captures some quantum gravity
effects. The existence of such a minimum distance between spacetime events
modifies the associ... | [
{
"created": "Fri, 19 Apr 2019 02:45:49 GMT",
"version": "v1"
},
{
"created": "Sat, 31 Aug 2019 00:47:25 GMT",
"version": "v2"
}
] | 2019-09-04 | [
[
"Chakraborty",
"Sumanta",
""
],
[
"Kothawala",
"Dawood",
""
],
[
"Pesci",
"Alessandro",
""
]
] | The Raychaudhuri equation for a geodesic congruence in the presence of a zero-point length has been investigated. This is directly related to the small-scale structure of spacetime and possibly captures some quantum gravity effects. The existence of such a minimum distance between spacetime events modifies the associat... |
0911.5317 | Jiri Podolsky | Jiri Podolsky, Otakar Svitek | Past horizons in Robinson-Trautman spacetimes with a cosmological
constant | 13 pages, 5 figures. To appear in Phys. Rev. D | Phys.Rev.D80:124042,2009 | 10.1103/PhysRevD.80.124042 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study past horizons in the class of type II Robinson-Trautman vacuum
spacetimes with a cosmological constant. These exact radiative solutions of
Einstein's equations exist in the future of any sufficiently smooth initial
data, and they approach the corresponding spherically symmetric
Schwarzschild-(anti-)de Sitter... | [
{
"created": "Fri, 27 Nov 2009 17:30:20 GMT",
"version": "v1"
}
] | 2010-04-21 | [
[
"Podolsky",
"Jiri",
""
],
[
"Svitek",
"Otakar",
""
]
] | We study past horizons in the class of type II Robinson-Trautman vacuum spacetimes with a cosmological constant. These exact radiative solutions of Einstein's equations exist in the future of any sufficiently smooth initial data, and they approach the corresponding spherically symmetric Schwarzschild-(anti-)de Sitter m... |
gr-qc/0012090 | Kechkin O. V. | Oleg V. Kechkin | New matrix formalism for heterotic string theory on a torus | 19 pages in LaTex | null | null | null | gr-qc | null | A new Lagrange formalism based on the use of a single scalar (d+1)X(d+1+n)
matrix potential is developed for the low-energy heterotic string theory with n
U(1) gauge fields compactified from d+3 to 3 dimensions on a torus. This
formalism also includes three pairs on-shell defined scalar and vector matrix
potentials o... | [
{
"created": "Thu, 21 Dec 2000 22:34:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kechkin",
"Oleg V.",
""
]
] | A new Lagrange formalism based on the use of a single scalar (d+1)X(d+1+n) matrix potential is developed for the low-energy heterotic string theory with n U(1) gauge fields compactified from d+3 to 3 dimensions on a torus. This formalism also includes three pairs on-shell defined scalar and vector matrix potentials of ... |
0802.1914 | Roman Sverdlov | Roman Sverdlov | A Geometrical Description of Spinor Fields | 8 pages, no figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The goal of this paper is to present the way to define fermionic fields and
their Lagrangians in terms of three orthogonal vector fields of norm 1 together
with two real valued scalar fields. This paper is based on a toy model where
there are no Grassmann variables.
| [
{
"created": "Wed, 13 Feb 2008 21:43:39 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Aug 2008 04:08:12 GMT",
"version": "v2"
}
] | 2008-08-05 | [
[
"Sverdlov",
"Roman",
""
]
] | The goal of this paper is to present the way to define fermionic fields and their Lagrangians in terms of three orthogonal vector fields of norm 1 together with two real valued scalar fields. This paper is based on a toy model where there are no Grassmann variables. |
1907.03765 | Antonios Tsokaros A. | Antonios Tsokaros, Milton Ruiz, Lunan Sun, Stuart L. Shapiro, K\=oji
Ury\=u | Dynamically stable ergostars exist: General relativistic models and
simulations | 5 pages, 3 figures, to appear in PRL | Phys. Rev. Lett. 123, 231103 (2019) | 10.1103/PhysRevLett.123.231103 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct the first dynamically stable ergostars (equilibrium neutron
stars that contain an ergoregion) for a compressible, causal equation of state.
We demonstrate their stability by evolving both strict and perturbed
equilibrium configurations in full general relativity for over a hundred
dynamical timescales ($... | [
{
"created": "Mon, 8 Jul 2019 18:00:02 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Nov 2019 04:16:42 GMT",
"version": "v2"
}
] | 2019-12-11 | [
[
"Tsokaros",
"Antonios",
""
],
[
"Ruiz",
"Milton",
""
],
[
"Sun",
"Lunan",
""
],
[
"Shapiro",
"Stuart L.",
""
],
[
"Uryū",
"Kōji",
""
]
] | We construct the first dynamically stable ergostars (equilibrium neutron stars that contain an ergoregion) for a compressible, causal equation of state. We demonstrate their stability by evolving both strict and perturbed equilibrium configurations in full general relativity for over a hundred dynamical timescales ($\g... |
gr-qc/0107064 | Spyros S. Kouris | Spyros S. Kouris | The Weyl tensor two-point function in de Sitter spacetime | 9 pages, no figures | Class.Quant.Grav. 18 (2001) 4961-4968 | 10.1088/0264-9381/18/22/316 | null | gr-qc | null | We present an expression for the Weyl-Weyl two-point function in de Sitter
spacetime, based on a recently calculated covariant graviton two-point function
with one gauge parameter. We find that the Weyl-Weyl two-point function falls
off with distance like r^{-4}, where r is spacelike coordinate separation
between the... | [
{
"created": "Wed, 18 Jul 2001 20:17:43 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Kouris",
"Spyros S.",
""
]
] | We present an expression for the Weyl-Weyl two-point function in de Sitter spacetime, based on a recently calculated covariant graviton two-point function with one gauge parameter. We find that the Weyl-Weyl two-point function falls off with distance like r^{-4}, where r is spacelike coordinate separation between the t... |
0803.3433 | Thomas Sotiriou | Enrico Barausse and Thomas P. Sotiriou | Perturbed Kerr Black Holes can probe deviations from General Relativity | minor changes to match version published in Phys. Rev. Lett | Phys.Rev.Lett.101:099001,2008 | 10.1103/PhysRevLett.101.099001 | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Although the Kerr solution is common to many gravity theories, its
perturbations are different in different theories. Hence, perturbed Kerr black
holes can probe deviations from General Relativity.
| [
{
"created": "Mon, 24 Mar 2008 17:51:18 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Sep 2008 09:20:21 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Barausse",
"Enrico",
""
],
[
"Sotiriou",
"Thomas P.",
""
]
] | Although the Kerr solution is common to many gravity theories, its perturbations are different in different theories. Hence, perturbed Kerr black holes can probe deviations from General Relativity. |
2207.08847 | Jorge Delgado | Jorge F. M. Delgado | Epicyclic Frequencies for a Generic Ultracompact Object | 12 pages, 5 figures | null | 10.1103/PhysRevD.106.064054 | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | Recently, it has been shown that the radial stability of a light-ring (LR) in
a spacetime generated by a stationary, axisymmetric, asymptotically flat object
with a $\mathbb{Z}_2$ symmetry determines the possibility and radial stability
of timelike circular orbits (TCOs) around the LR. In this paper, we generalise
th... | [
{
"created": "Mon, 18 Jul 2022 18:00:13 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Jan 2023 19:00:02 GMT",
"version": "v2"
}
] | 2023-01-04 | [
[
"Delgado",
"Jorge F. M.",
""
]
] | Recently, it has been shown that the radial stability of a light-ring (LR) in a spacetime generated by a stationary, axisymmetric, asymptotically flat object with a $\mathbb{Z}_2$ symmetry determines the possibility and radial stability of timelike circular orbits (TCOs) around the LR. In this paper, we generalise this... |
2403.00310 | Amarkumar Agrawal | P.H.R.S. Moraes, A.S. Agrawal, and B. Mishra | Wormholes in the f(R,L,T) theory of gravity | 5 Pages, 4 figures | Physics Letter B, Volume 855, August 2024 | 10.1016/j.physletb.2024.138818 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Morris and Thorne developed wormhole solutions in the late 1980s when they
discovered a recipe that wormholes must follow for travelers to cross them
safely. They describe exotic matter as satisfying $-p_{r} > \rho$, where
$p_{r}$ is the radial pressure and $\rho$ is the energy density of the
wormhole. This is a nota... | [
{
"created": "Fri, 1 Mar 2024 06:23:12 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Jun 2024 11:43:19 GMT",
"version": "v2"
}
] | 2024-06-25 | [
[
"Moraes",
"P. H. R. S.",
""
],
[
"Agrawal",
"A. S.",
""
],
[
"Mishra",
"B.",
""
]
] | Morris and Thorne developed wormhole solutions in the late 1980s when they discovered a recipe that wormholes must follow for travelers to cross them safely. They describe exotic matter as satisfying $-p_{r} > \rho$, where $p_{r}$ is the radial pressure and $\rho$ is the energy density of the wormhole. This is a notabl... |
1209.1344 | Jonathan Ziprick | Jonathan Ziprick | Point particles in 2+1 dimensions: toward a semiclassical loop gravity
formulation | for Theory Canada 7 conference proceedings in Canadian Journal of
Physics | Canadian Journal of Physics 91(6) 467 (2013) | 10.1139/cjp-2012-0385 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study point particles in 2+1 dimensional first order gravity using a
triangulation to fix the connection and frame-field. The Hamiltonian is reduced
to a boundary term which yields the total mass. The triangulation is dynamical
with non-trivial transitions occurring when a particle meets an edge. This
framework fa... | [
{
"created": "Thu, 6 Sep 2012 17:04:50 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Ziprick",
"Jonathan",
""
]
] | We study point particles in 2+1 dimensional first order gravity using a triangulation to fix the connection and frame-field. The Hamiltonian is reduced to a boundary term which yields the total mass. The triangulation is dynamical with non-trivial transitions occurring when a particle meets an edge. This framework faci... |
gr-qc/0603125 | M. Meyer | S. Deser | Why is the metric invertible? | 3 pages | Class.Quant.Grav.23:4539-4541,2006 | 10.1088/0264-9381/23/13/N01 | BRX TH-549 | gr-qc hep-th | null | We raise, and provide an (unsatisfactory) answer to, the title's question:
why, unlike all other fields, does the gravitational "metric" variable not have
zero vacuum? After formulating, without begging it, we exhibit additions to the
conventional action that express existence of the inverse through a field
equation.... | [
{
"created": "Thu, 30 Mar 2006 18:48:22 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Deser",
"S.",
""
]
] | We raise, and provide an (unsatisfactory) answer to, the title's question: why, unlike all other fields, does the gravitational "metric" variable not have zero vacuum? After formulating, without begging it, we exhibit additions to the conventional action that express existence of the inverse through a field equation. |
1702.06699 | Crucean Cosmin | Cosmin Crucean and Mihaela-Andreea B\u{a}loi | Perturbative approach to the problem of particle production in electric
field on de Sitter universe | 14 pages, 4 figures | Mod. Phys. Lett. A 31, 1650082 (2016) | 10.1142/S0217732316500826 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this letter we study the problem of scalar particle production in external
electric field in de Sitter geometry. The total probability is calculated using
the previously obtained result in Ref.\cite{6} for transition amplitude in
external electric field on de Sitter space. Then we make a graphical study of
the tot... | [
{
"created": "Wed, 22 Feb 2017 08:17:39 GMT",
"version": "v1"
}
] | 2017-02-23 | [
[
"Crucean",
"Cosmin",
""
],
[
"Băloi",
"Mihaela-Andreea",
""
]
] | In this letter we study the problem of scalar particle production in external electric field in de Sitter geometry. The total probability is calculated using the previously obtained result in Ref.\cite{6} for transition amplitude in external electric field on de Sitter space. Then we make a graphical study of the total... |
0811.2910 | Attila Andai | Istvan Nemeti, Judit X. Madarasz, Hajnal Andreka, Attila Andai | Visualizing some ideas about Godel-type rotating universes | 84 pages, 70 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper consists mostly of pictures visualizing ideas leading to Godel's
rotating cosmological model. The pictures are constructed according to concrete
metric tensor fields. Information about these are in the last chapters. The
main aim is to visualise ideas.
| [
{
"created": "Tue, 18 Nov 2008 06:40:53 GMT",
"version": "v1"
}
] | 2008-11-19 | [
[
"Nemeti",
"Istvan",
""
],
[
"Madarasz",
"Judit X.",
""
],
[
"Andreka",
"Hajnal",
""
],
[
"Andai",
"Attila",
""
]
] | This paper consists mostly of pictures visualizing ideas leading to Godel's rotating cosmological model. The pictures are constructed according to concrete metric tensor fields. Information about these are in the last chapters. The main aim is to visualise ideas. |
0706.3266 | Shintaro Sawayama | Shintaro Sawayama | Quantization of the metric diagonal spacetime with Gaussian normal
coordinates | 3 pages, no figures | null | null | null | gr-qc | null | In the analysis of the Wheeler-DeWitt equation, we have simplified the
Hamiltonian constraint of the Wheeler-DeWitt equation using the coordinate
transformation. The coordinate is choose such that metric becomes diagonal and
as Gaussian normal coordinate. Or we treat small universe so that the metric
become diagonal ... | [
{
"created": "Fri, 22 Jun 2007 06:39:14 GMT",
"version": "v1"
}
] | 2007-06-25 | [
[
"Sawayama",
"Shintaro",
""
]
] | In the analysis of the Wheeler-DeWitt equation, we have simplified the Hamiltonian constraint of the Wheeler-DeWitt equation using the coordinate transformation. The coordinate is choose such that metric becomes diagonal and as Gaussian normal coordinate. Or we treat small universe so that the metric become diagonal an... |
gr-qc/0208085 | Mario Everaldo de Souza | Mario Everaldo de Souza | Gravity cannot be quantized | 6 pages, Latex | null | null | DFI-08-2002 | gr-qc astro-ph quant-ph | null | This work shows that the gravitational field is rather an unusual field and
cannot be quantized due to the absence of a fermion charge carrier. When its
existence is assumed quite strange results are obtained for its mass. And this
means that the graviton does not exist either since bosons act between fermion
states.... | [
{
"created": "Tue, 27 Aug 2002 20:43:37 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"de Souza",
"Mario Everaldo",
""
]
] | This work shows that the gravitational field is rather an unusual field and cannot be quantized due to the absence of a fermion charge carrier. When its existence is assumed quite strange results are obtained for its mass. And this means that the graviton does not exist either since bosons act between fermion states. |
0802.1588 | Robert Brout | R. Brout | Entanglement and Thermodynamics of Black Hole Entropy | 5 pages | Int.J.Mod.Phys.D17:2549-2553,2009 | 10.1142/S0218271808014187 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using simple conditions drawn from the stability of the cosmos in terms of
vacuum energy density, the cut-off momentum of entanglement is related to the
planckian mass. In so doing the black hole entropy is shown to be independent
of the number of field species that contribute to vacuum fluctuations. And this
is in s... | [
{
"created": "Tue, 12 Feb 2008 18:34:12 GMT",
"version": "v1"
}
] | 2009-03-20 | [
[
"Brout",
"R.",
""
]
] | Using simple conditions drawn from the stability of the cosmos in terms of vacuum energy density, the cut-off momentum of entanglement is related to the planckian mass. In so doing the black hole entropy is shown to be independent of the number of field species that contribute to vacuum fluctuations. And this is in spi... |
2007.10422 | Oscar Lasso Andino | Oscar Lasso Andino, Christian L. V\'asconez | The quantum non-linear $\sigma$-model RG flow and integrability in
wormhole geometries | 18 pg | Nuclear Physics B, Volume 990, 2023, 116178 | 10.1016/j.nuclphysb.2023.116178 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The target space of the non-linear $\sigma$-model is a Riemannian manifold.
Although it can be any Riemannian metric, there are certain physically
interesting geometries which are worth to study. Here, we numerically evolve
the time-symmetric foliations of a family of spherically symmetric
asymptotically flat wormhol... | [
{
"created": "Mon, 20 Jul 2020 19:27:46 GMT",
"version": "v1"
},
{
"created": "Tue, 10 May 2022 19:02:08 GMT",
"version": "v2"
},
{
"created": "Wed, 1 Feb 2023 02:57:56 GMT",
"version": "v3"
}
] | 2023-04-12 | [
[
"Andino",
"Oscar Lasso",
""
],
[
"Vásconez",
"Christian L.",
""
]
] | The target space of the non-linear $\sigma$-model is a Riemannian manifold. Although it can be any Riemannian metric, there are certain physically interesting geometries which are worth to study. Here, we numerically evolve the time-symmetric foliations of a family of spherically symmetric asymptotically flat wormholes... |
2312.07400 | Yongqiang Wang | Long-Xing Huang, Shi-Xian Sun, Yong-Qiang Wang | Frozen Bardeen-Dirac stars and light ball | 22 pages, 7 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study solutions of a static spherically symmetric system,
which is composed of the coupling with the Bardeen action and two Dirac fields.
For the case where only the Bardeen action is present, the magnetic charge $q$
can be infinite, then when the magnetic charge is greater than a certain value
$q_b... | [
{
"created": "Tue, 12 Dec 2023 16:15:45 GMT",
"version": "v1"
}
] | 2023-12-13 | [
[
"Huang",
"Long-Xing",
""
],
[
"Sun",
"Shi-Xian",
""
],
[
"Wang",
"Yong-Qiang",
""
]
] | In this paper, we study solutions of a static spherically symmetric system, which is composed of the coupling with the Bardeen action and two Dirac fields. For the case where only the Bardeen action is present, the magnetic charge $q$ can be infinite, then when the magnetic charge is greater than a certain value $q_b$,... |
1908.04223 | Hirotaka Yoshino | Hirotaka Yoshino, Kazuma Takahashi, Ken-ichi Nakao | How does a collapsing star look? | 55 pages, 21 figures, published version | Phys. Rev. D 100, 084062 (2019) | 10.1103/PhysRevD.100.084062 | OCU-PHYS-507, AP-GR-156, NITEP 27 | gr-qc astro-ph.GA hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Time evolution of an optical image of a pressureless star under gravitational
collapse is studied in the geometric optics approximation. The star surface is
assumed to emit radiation obeying Lambert's cosine law but with an arbitrary
spectral intensity in the comoving frame. We develop a formalism for predicting
obse... | [
{
"created": "Mon, 12 Aug 2019 16:23:06 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Nov 2019 16:23:32 GMT",
"version": "v2"
}
] | 2019-11-04 | [
[
"Yoshino",
"Hirotaka",
""
],
[
"Takahashi",
"Kazuma",
""
],
[
"Nakao",
"Ken-ichi",
""
]
] | Time evolution of an optical image of a pressureless star under gravitational collapse is studied in the geometric optics approximation. The star surface is assumed to emit radiation obeying Lambert's cosine law but with an arbitrary spectral intensity in the comoving frame. We develop a formalism for predicting observ... |
2404.07782 | Miguel Zumalacarregui | Julius Streibert, Hector O. Silva, Miguel Zumalac\'arregui | Gravitational-wave lensing in Einstein-aether theory | 19 pages plus appendices, 4 figures | null | null | null | gr-qc astro-ph.CO astro-ph.HE hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | Einstein-aether theory provides a model to test the validity of local Lorentz
invariance in gravitational interactions. The speed of gravitational waves as
measured from the binary neutron star event GW170817 sets stringent limits on
Einstein-aether theory, but only on a combination of the theory's free
parameters. F... | [
{
"created": "Thu, 11 Apr 2024 14:21:47 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Apr 2024 12:56:27 GMT",
"version": "v2"
}
] | 2024-05-01 | [
[
"Streibert",
"Julius",
""
],
[
"Silva",
"Hector O.",
""
],
[
"Zumalacárregui",
"Miguel",
""
]
] | Einstein-aether theory provides a model to test the validity of local Lorentz invariance in gravitational interactions. The speed of gravitational waves as measured from the binary neutron star event GW170817 sets stringent limits on Einstein-aether theory, but only on a combination of the theory's free parameters. For... |
1606.05590 | Johannes Noller | Philippe Brax, Anne-Christine Davis, Johannes Noller | Dark Energy and Doubly Coupled Bigravity | 47 pages, 8 figures | Class.Quant.Grav. 34 (2017) no.9, 095014 | 10.1088/1361-6382/aa6856 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse the late time cosmology and the gravitational properties of doubly
coupled bigravity in the constrained vielbein formalism (equivalent to the
metric formalism) when the mass of the massive graviton is of the order of the
present Hubble rate. We focus on one of the two branches of background
cosmology where... | [
{
"created": "Fri, 17 Jun 2016 17:02:05 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Nov 2016 15:56:17 GMT",
"version": "v2"
}
] | 2017-04-21 | [
[
"Brax",
"Philippe",
""
],
[
"Davis",
"Anne-Christine",
""
],
[
"Noller",
"Johannes",
""
]
] | We analyse the late time cosmology and the gravitational properties of doubly coupled bigravity in the constrained vielbein formalism (equivalent to the metric formalism) when the mass of the massive graviton is of the order of the present Hubble rate. We focus on one of the two branches of background cosmology where t... |
gr-qc/0004034 | Jerry B. Griffiths | G. A. Alekseev and J. B. Griffiths | Infinite hierarchies of exact solutions of the Einstein and
Einstein-Maxwell equations for interacting waves and inhomogeneous
cosmologies | 7 pages, minor correction and reduction to conform with published
version | Phys.Rev.Lett.84:5247-5250,2000 | 10.1103/PhysRevLett.84.5247 | null | gr-qc | null | For space-times with two spacelike isometries, we present infinite
hierarchies of exact solutions of the Einstein and Einstein--Maxwell equations
as represented by their Ernst potentials. This hierarchy contains three
arbitrary rational functions of an auxiliary complex parameter. They are
constructed using the so ca... | [
{
"created": "Wed, 12 Apr 2000 08:59:40 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Jun 2000 11:37:11 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Alekseev",
"G. A.",
""
],
[
"Griffiths",
"J. B.",
""
]
] | For space-times with two spacelike isometries, we present infinite hierarchies of exact solutions of the Einstein and Einstein--Maxwell equations as represented by their Ernst potentials. This hierarchy contains three arbitrary rational functions of an auxiliary complex parameter. They are constructed using the so call... |
1811.10905 | Vahid Kamali | Vahid Kamali | Non-minimal Higgs inflation in the context of warm scenario in the light
of Planck data | 6 pages, 4 figures, the paper has been accepted by EPJC | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the non-minimally Higgs inflaton (HI) model in the context of
warm inflation scenario. Warm little inflaton (WLI) model considers the little
Higgs boson as inflaton. The concerns of warm inflation model can be eliminated
in WLI model. There is a special case of dissipation parameter in WLI model
$\Gamm... | [
{
"created": "Tue, 27 Nov 2018 10:42:04 GMT",
"version": "v1"
}
] | 2018-11-28 | [
[
"Kamali",
"Vahid",
""
]
] | We investigate the non-minimally Higgs inflaton (HI) model in the context of warm inflation scenario. Warm little inflaton (WLI) model considers the little Higgs boson as inflaton. The concerns of warm inflation model can be eliminated in WLI model. There is a special case of dissipation parameter in WLI model $\Gamma=... |
1612.02853 | David Sloan | David Sloan and Pedro Ferreira | The Cosmology of an Infinite Dimensional Universe | 10 pages, significant revisions from previous version | Phys. Rev. D 96, 043527 (2017) | 10.1103/PhysRevD.96.043527 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a universe with an arbitrary number of extra dimensions, $N$. We
present a new method for constructing the cosmological equations of motion and
find analytic solutions with an explicit dependence on $N$. When we take the
$N\rightarrow\infty$ limit we find novel, emergent behaviour which
distinguishes it f... | [
{
"created": "Thu, 8 Dec 2016 21:49:06 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Aug 2017 20:59:37 GMT",
"version": "v2"
}
] | 2017-09-06 | [
[
"Sloan",
"David",
""
],
[
"Ferreira",
"Pedro",
""
]
] | We consider a universe with an arbitrary number of extra dimensions, $N$. We present a new method for constructing the cosmological equations of motion and find analytic solutions with an explicit dependence on $N$. When we take the $N\rightarrow\infty$ limit we find novel, emergent behaviour which distinguishes it fro... |
1903.03436 | Naresh Dadhich | Naresh Dadhich | Buchdahl compactness limit and gravitational field energy | Almost matches with the published version | JCAP 04(2020)035 | 10.1088/1475-7516/2020/04/035 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The main aim of this paper is essentially to point out that the Buchdahl
compactness limit of a static object is given by \it{gravitational field energy
being less than or equal to half of its non-gravitational matter energy}. It is
thus entirely determined without any reference to interior distribution by the
exteri... | [
{
"created": "Mon, 4 Mar 2019 16:36:04 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Apr 2019 10:17:54 GMT",
"version": "v2"
},
{
"created": "Tue, 17 Sep 2019 09:25:56 GMT",
"version": "v3"
},
{
"created": "Mon, 3 Feb 2020 07:25:17 GMT",
"version": "v4"
},
{
"crea... | 2020-04-29 | [
[
"Dadhich",
"Naresh",
""
]
] | The main aim of this paper is essentially to point out that the Buchdahl compactness limit of a static object is given by \it{gravitational field energy being less than or equal to half of its non-gravitational matter energy}. It is thus entirely determined without any reference to interior distribution by the exterior... |
2206.03766 | Boris Goncharov | Boris Goncharov, Eric Thrane, Ryan M. Shannon, Jan Harms, N. D. Ramesh
Bhat, George Hobbs, Matthew Kerr, Richard N. Manchester, Daniel J. Reardon,
Christopher J. Russell, Xing-Jiang Zhu, Andrew Zic | Consistency of the Parkes Pulsar Timing Array Signal with a Nanohertz
Gravitational-wave Background | 9 pages, 2 figures | The Astrophysical Journal Letters, Volume 932, Number 2 (2022) | 10.3847/2041-8213/ac76bb | null | gr-qc astro-ph.HE astro-ph.IM | http://creativecommons.org/licenses/by/4.0/ | Pulsar timing array experiments have recently reported strong evidence for a
common-spectrum stochastic process with a strain spectral index consistent with
that expected of a nanohertz-frequency gravitational-wave background, but with
negligible yet non-zero evidence for spatial correlations required for a
definitiv... | [
{
"created": "Wed, 8 Jun 2022 09:25:03 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Jun 2022 17:03:33 GMT",
"version": "v2"
}
] | 2022-06-22 | [
[
"Goncharov",
"Boris",
""
],
[
"Thrane",
"Eric",
""
],
[
"Shannon",
"Ryan M.",
""
],
[
"Harms",
"Jan",
""
],
[
"Bhat",
"N. D. Ramesh",
""
],
[
"Hobbs",
"George",
""
],
[
"Kerr",
"Matthew",
""
],
[
"M... | Pulsar timing array experiments have recently reported strong evidence for a common-spectrum stochastic process with a strain spectral index consistent with that expected of a nanohertz-frequency gravitational-wave background, but with negligible yet non-zero evidence for spatial correlations required for a definitive ... |
1804.09823 | Matthew Duez | Wyatt Brege, Matthew D. Duez, Francois Foucart, M. Brett Deaton, Jesus
Caro, Daniel A. Hemberger, Lawrence E. Kidder, Evan O'Connor, Harald P.
Pfeiffer, and Mark A. Scheel | Black hole-neutron star mergers using a survey of finite-temperature
equations of state | 10 pages, 11 figures, submitted to Phys. Rev. D | Phys. Rev. D 98, 063009 (2018) | 10.1103/PhysRevD.98.063009 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Each of the potential signals from a black hole-neutron star merger should
contain an imprint of the neutron star equation of state: gravitational waves
via its effect on tidal disruption, the kilonova via its effect on the ejecta,
and the gamma ray burst via its effect on the remnant disk. These effects have
been st... | [
{
"created": "Wed, 25 Apr 2018 22:37:51 GMT",
"version": "v1"
}
] | 2018-09-19 | [
[
"Brege",
"Wyatt",
""
],
[
"Duez",
"Matthew D.",
""
],
[
"Foucart",
"Francois",
""
],
[
"Deaton",
"M. Brett",
""
],
[
"Caro",
"Jesus",
""
],
[
"Hemberger",
"Daniel A.",
""
],
[
"Kidder",
"Lawrence E.",
""
... | Each of the potential signals from a black hole-neutron star merger should contain an imprint of the neutron star equation of state: gravitational waves via its effect on tidal disruption, the kilonova via its effect on the ejecta, and the gamma ray burst via its effect on the remnant disk. These effects have been stud... |
1001.2663 | Tomasz Pawlowski | Wojciech Kaminski, Tomasz Pawlowski | Cosmic recall and the scattering picture of Loop Quantum Cosmology | RevTex4, 19 pages, 3 figures | Phys.Rev.D81:084027,2010 | 10.1103/PhysRevD.81.084027 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The global dynamics of a homogeneous universe in Loop Quantum Cosmology is
viewed as a scattering process of its geometrodynamical equivalent. This
picture is applied to build a flexible (easy to generalize) and not restricted
just to exactly solvable models method of verifying the preservation of the
semiclassicalit... | [
{
"created": "Fri, 15 Jan 2010 19:05:37 GMT",
"version": "v1"
}
] | 2010-04-22 | [
[
"Kaminski",
"Wojciech",
""
],
[
"Pawlowski",
"Tomasz",
""
]
] | The global dynamics of a homogeneous universe in Loop Quantum Cosmology is viewed as a scattering process of its geometrodynamical equivalent. This picture is applied to build a flexible (easy to generalize) and not restricted just to exactly solvable models method of verifying the preservation of the semiclassicality ... |
gr-qc/0409113 | Nosrat-ollah Jafari Sonbolabadi | Nosratollah Jafari, Ahmad Shariati | Comments on the Quantum Vacuum and the Light Acceleration | 4 pages | null | null | null | gr-qc astro-ph hep-ph hep-th | null | The recent observations on the far quasars absorption lines spectra and
comparison of these lines with laboratory ones provide a framework for
explantation of these observations by considering a varying fine structure
constant, over the cosmological time-scale. Also, there seems to be an
anomalous acceleration in the... | [
{
"created": "Wed, 29 Sep 2004 09:16:31 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Jafari",
"Nosratollah",
""
],
[
"Shariati",
"Ahmad",
""
]
] | The recent observations on the far quasars absorption lines spectra and comparison of these lines with laboratory ones provide a framework for explantation of these observations by considering a varying fine structure constant, over the cosmological time-scale. Also, there seems to be an anomalous acceleration in the P... |
1801.01276 | Andronikos Paliathanasis | A. Paliathanasis, Adamantia Zampeli, T. Christodoulakis and M.T.
Mustafa | Quantization of the Szekeres System | 7 pages, 3 figures, typos corrected in section 3.2, to appear in
Classical and Quantum Gravity | null | 10.1088/1361-6382/aac227 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the quantum corrections on the Szekeres system in the context of
canonical quantization in the presence of symmetries. We start from an
effective point-like Lagrangian with two integrals of motion, one corresponding
to the Hamiltonian and the other to a second rank Killing tensor. Imposing
their quantum vers... | [
{
"created": "Thu, 4 Jan 2018 08:32:20 GMT",
"version": "v1"
},
{
"created": "Thu, 3 May 2018 06:36:18 GMT",
"version": "v2"
}
] | 2018-06-13 | [
[
"Paliathanasis",
"A.",
""
],
[
"Zampeli",
"Adamantia",
""
],
[
"Christodoulakis",
"T.",
""
],
[
"Mustafa",
"M. T.",
""
]
] | We study the quantum corrections on the Szekeres system in the context of canonical quantization in the presence of symmetries. We start from an effective point-like Lagrangian with two integrals of motion, one corresponding to the Hamiltonian and the other to a second rank Killing tensor. Imposing their quantum versio... |
gr-qc/9911015 | Luis Herrera | L. Herrera, (Universidad de Salamanca) | The Relativistic Transformation to Rotating Frames | 16 pages, Latex | NuovoCim.B115:307-318,2000 | null | null | gr-qc math-ph math.MP | null | We present a critical review of the relativistic rotation transformation of
Trocheris and Takeno. A new transformation is proposed which is free from the
drawbacks of the former. Some applications are presented.
| [
{
"created": "Thu, 4 Nov 1999 10:58:48 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Herrera",
"L.",
""
]
] | We present a critical review of the relativistic rotation transformation of Trocheris and Takeno. A new transformation is proposed which is free from the drawbacks of the former. Some applications are presented. |
gr-qc/0109062 | Yves Wiaux | J.-M. Gerard and Y. Wiaux | Gravitational dipole radiations from binary systems | One comment added, accepted for publication in Phys. Rev. D | Phys.Rev. D66 (2002) 024040 | 10.1103/PhysRevD.66.024040 | UCL-IPT-01-14 | gr-qc astro-ph hep-ph | null | We investigate the possibility of generating sizeable dipole radiations in
relativistic theories of gravity. Optimal parameters to observe their effects
through the orbital period decay of binary star systems are discussed.
Constraints on gravitational couplings beyond general relativity are derived.
| [
{
"created": "Wed, 19 Sep 2001 09:20:39 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jun 2002 14:22:44 GMT",
"version": "v2"
}
] | 2007-08-14 | [
[
"Gerard",
"J. -M.",
""
],
[
"Wiaux",
"Y.",
""
]
] | We investigate the possibility of generating sizeable dipole radiations in relativistic theories of gravity. Optimal parameters to observe their effects through the orbital period decay of binary star systems are discussed. Constraints on gravitational couplings beyond general relativity are derived. |
1008.2212 | Daniela Alic | Daniela Alic, Luciano Rezzolla, Ian Hinder, Philipp M\"osta | Dynamical damping terms for symmetry-seeking shift conditions | 11 pages, 8 figures | Class.Quant.Grav.27:245023,2010 | 10.1088/0264-9381/27/24/245023 | AEI-2010-130 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Suitable gauge conditions are fundamental for stable and accurate
numerical-relativity simulations of inspiralling compact binaries. A number of
well-studied conditions have been developed over the last decade for both the
lapse and the shift and these have been successfully used both in vacuum and
non-vacuum spaceti... | [
{
"created": "Thu, 12 Aug 2010 20:27:29 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Nov 2010 21:08:24 GMT",
"version": "v2"
}
] | 2010-12-06 | [
[
"Alic",
"Daniela",
""
],
[
"Rezzolla",
"Luciano",
""
],
[
"Hinder",
"Ian",
""
],
[
"Mösta",
"Philipp",
""
]
] | Suitable gauge conditions are fundamental for stable and accurate numerical-relativity simulations of inspiralling compact binaries. A number of well-studied conditions have been developed over the last decade for both the lapse and the shift and these have been successfully used both in vacuum and non-vacuum spacetime... |
gr-qc/0003097 | Young-Jai Park | Soon-Tae Hong, Yong-Wan Kim, and Young-Jai Park | Higher dimensional flat embeddings of (2+1) dimensional black holes | 16pages, revtex, no figures, to appear in Phys. Rev. D | Phys.Rev. D62 (2000) 024024 | 10.1103/PhysRevD.62.024024 | SOGANG-HEP 268/00 | gr-qc | null | We obtain the higher dimensional global flat embeddings of static, rotating,
and charged BTZ black holes. On the other hand, we also study the similar
higher dimensional flat embeddings of the (2+1) de Sitter black holes which are
the counterparts of the anti-de Sitter BTZ black holes. As a result, the
charged dS bla... | [
{
"created": "Sat, 25 Mar 2000 00:48:50 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Hong",
"Soon-Tae",
""
],
[
"Kim",
"Yong-Wan",
""
],
[
"Park",
"Young-Jai",
""
]
] | We obtain the higher dimensional global flat embeddings of static, rotating, and charged BTZ black holes. On the other hand, we also study the similar higher dimensional flat embeddings of the (2+1) de Sitter black holes which are the counterparts of the anti-de Sitter BTZ black holes. As a result, the charged dS black... |
1307.7391 | Daniela Alic | Daniela Alic, Wolfgang Kastaun, Luciano Rezzolla | Constraint damping of the conformal and covariant formulation of the Z4
system in simulations of binary neutron stars | 15 pages, 11 figures; accepted for publication in Phys. Rev. D | Phys. Rev. D 88, 064049 (2013) | 10.1103/PhysRevD.88.064049 | AEI-2013-231 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Following previous work in vacuum spacetimes, we investigate the
constraint-damping properties in the presence of matter of the recently
developed traceless, conformal and covariant Z4 (CCZ4) formulation of the
Einstein equations. First, we evolve an isolated neutron star with an ideal gas
equation of state and subje... | [
{
"created": "Sun, 28 Jul 2013 18:38:34 GMT",
"version": "v1"
},
{
"created": "Sat, 21 Sep 2013 09:33:39 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Alic",
"Daniela",
""
],
[
"Kastaun",
"Wolfgang",
""
],
[
"Rezzolla",
"Luciano",
""
]
] | Following previous work in vacuum spacetimes, we investigate the constraint-damping properties in the presence of matter of the recently developed traceless, conformal and covariant Z4 (CCZ4) formulation of the Einstein equations. First, we evolve an isolated neutron star with an ideal gas equation of state and subject... |
2011.07742 | Ken Matsuno | Ken Matsuno | Light deflection by squashed Kaluza-Klein black holes in a plasma medium | 18 pages, 4 figures | Phys. Rev. D 103, 044008 (2021) | 10.1103/PhysRevD.103.044008 | OCU-PHYS-525, AP-GR-162 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study motions of photons in an unmagnetized cold homogeneous plasma medium
in the five-dimensional charged static squashed Kaluza-Klein black hole
spacetime. In this case, a photon behaves as a massive particle in a
four-dimensional spherically symmetric spacetime. We consider the light
deflection by the squashed ... | [
{
"created": "Mon, 16 Nov 2020 06:36:21 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Jan 2021 10:12:27 GMT",
"version": "v2"
}
] | 2021-02-05 | [
[
"Matsuno",
"Ken",
""
]
] | We study motions of photons in an unmagnetized cold homogeneous plasma medium in the five-dimensional charged static squashed Kaluza-Klein black hole spacetime. In this case, a photon behaves as a massive particle in a four-dimensional spherically symmetric spacetime. We consider the light deflection by the squashed Ka... |
gr-qc/0511111 | Emanuele Berti | Emanuele Berti, Vitor Cardoso, Marc Casals | Eigenvalues and eigenfunctions of spin-weighted spheroidal harmonics in
four and higher dimensions | 26 pages, 10 figures. Corrected typos in Eqs. (2.16f) and (2.16g) | Phys.Rev.D73:024013,2006; Erratum-ibid.D73:109902,2006 | 10.1103/PhysRevD.73.024013 10.1103/PhysRevD.73.109902 | null | gr-qc hep-th math-ph math.MP | null | Spin-weighted spheroidal harmonics are useful in a variety of physical
situations, including light scattering, nuclear modeling, signal processing,
electromagnetic wave propagation, black hole perturbation theory in four and
higher dimensions, quantum field theory in curved space-time and studies of
D-branes. We firs... | [
{
"created": "Sun, 20 Nov 2005 20:38:29 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Jan 2006 10:01:45 GMT",
"version": "v2"
},
{
"created": "Wed, 18 Jan 2006 22:45:10 GMT",
"version": "v3"
},
{
"created": "Mon, 1 May 2006 19:55:46 GMT",
"version": "v4"
}
] | 2014-11-17 | [
[
"Berti",
"Emanuele",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"Casals",
"Marc",
""
]
] | Spin-weighted spheroidal harmonics are useful in a variety of physical situations, including light scattering, nuclear modeling, signal processing, electromagnetic wave propagation, black hole perturbation theory in four and higher dimensions, quantum field theory in curved space-time and studies of D-branes. We first ... |
2311.12393 | Mohaddese Heydari-Fard | Mohaddese Heydari-Fard, Malihe Heydari-Fard and Nematollah Riazi | Thin accretion disk images of rotating hairy Horndeski black holes | 14 pages, 10 figures | null | null | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | By considering the steady-state Novikov-Thorne model, we study thin accretion
disk processes for rotating hairy black holes in the framework of the Horndeski
gravity. We obtain the electromagnetic properties of accretion disk around such
black holes and investigate the effects of the hair parameter $h$ on them. We
fi... | [
{
"created": "Tue, 21 Nov 2023 07:06:37 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Jan 2024 19:48:25 GMT",
"version": "v2"
}
] | 2024-01-10 | [
[
"Heydari-Fard",
"Mohaddese",
""
],
[
"Heydari-Fard",
"Malihe",
""
],
[
"Riazi",
"Nematollah",
""
]
] | By considering the steady-state Novikov-Thorne model, we study thin accretion disk processes for rotating hairy black holes in the framework of the Horndeski gravity. We obtain the electromagnetic properties of accretion disk around such black holes and investigate the effects of the hair parameter $h$ on them. We find... |
2105.02879 | Moritz H\"ubner | Moritz H\"ubner and Paul Lasky and Eric Thrane | The Memory Remains (Undetected): Updates from the Second LIGO/Virgo
Gravitational-Wave Transient Catalog | 6 pages, 3 figures | Phys. Rev. D 104, 023004 (2021) | 10.1103/PhysRevD.104.023004 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | The LIGO and Virgo observatories have reported 39 new gravitational-wave
detections during the first part of the third observation run, bringing the
total to 50. Most of these new detections are consistent with binary black-hole
coalescences, making them suitable targets to search for gravitational-wave
memory, a non... | [
{
"created": "Thu, 6 May 2021 07:21:15 GMT",
"version": "v1"
}
] | 2021-07-14 | [
[
"Hübner",
"Moritz",
""
],
[
"Lasky",
"Paul",
""
],
[
"Thrane",
"Eric",
""
]
] | The LIGO and Virgo observatories have reported 39 new gravitational-wave detections during the first part of the third observation run, bringing the total to 50. Most of these new detections are consistent with binary black-hole coalescences, making them suitable targets to search for gravitational-wave memory, a non-l... |
gr-qc/9507025 | Don N. Page | Don N. Page (University of Alberta, Edmonton, Canada) | Aspects of Quantum Cosmology | LaTeX, 18 pages, September 1995 Erice lectures | null | null | Alberta-Thy-14-95 | gr-qc quant-ph | null | Quantum mechanics may be formulated as SENSIBLE QUANTUM MECHANICS (SQM) so
that it contains nothing probabilistic, except, in a certain frequency sense,
conscious perceptions. Sets of these perceptions can be deterministically
realized with measures given by expectation values of positive-operator-valued
AWARENESS OP... | [
{
"created": "Wed, 12 Jul 1995 02:25:34 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Page",
"Don N.",
"",
"University of Alberta, Edmonton, Canada"
]
] | Quantum mechanics may be formulated as SENSIBLE QUANTUM MECHANICS (SQM) so that it contains nothing probabilistic, except, in a certain frequency sense, conscious perceptions. Sets of these perceptions can be deterministically realized with measures given by expectation values of positive-operator-valued AWARENESS OPER... |
2211.07775 | Nidal Chamoun | Mahmoud AlHallak (Damascus Univ.), Khalil Kalid Al Said (UDST), Nidal
Chamoun (HIAST) and Moustafa Sayem El-Daher (Damascus Univ.) | On Warm Natural Inflation and Planck 2018 constraints | pdflatex, 18 pages, 4 figures, version to appear in Universe as an
invited article for the Special Issue on `Warm Inflation' | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate Natural Inflation with non-minimal coupling to gravity,
characterized either by a quadratic or a periodic term, within the Warm
Inflation paradigm during the slow roll stage, in both strong and weak
dissipation limits, and show that, in the case of $T$-linearly dependent
dissipative term, it can accomm... | [
{
"created": "Mon, 14 Nov 2022 22:19:09 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Jan 2023 16:04:39 GMT",
"version": "v2"
}
] | 2023-01-25 | [
[
"AlHallak",
"Mahmoud",
"",
"Damascus Univ."
],
[
"Said",
"Khalil Kalid Al",
"",
"UDST"
],
[
"Chamoun",
"Nidal",
"",
"HIAST"
],
[
"El-Daher",
"Moustafa Sayem",
"",
"Damascus Univ."
]
] | We investigate Natural Inflation with non-minimal coupling to gravity, characterized either by a quadratic or a periodic term, within the Warm Inflation paradigm during the slow roll stage, in both strong and weak dissipation limits, and show that, in the case of $T$-linearly dependent dissipative term, it can accommod... |
2310.15186 | Nasr Ahmed | Nasr Ahmed and Anirudh Pradhan | Logamediate inflation on the Swiss-cheese brane | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The existence of Schwarzchild black holes in the structure of Swiss-cheese
brane-world led to the argument that this specific brane-world scenario is more
realistic than the FLRW branes. In this paper, we show that a Logamediate
inflation on the Swiss-cheese brane leads to a positive kinetic term and a
negative poten... | [
{
"created": "Fri, 20 Oct 2023 19:49:39 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Oct 2023 16:32:02 GMT",
"version": "v2"
},
{
"created": "Thu, 20 Jun 2024 07:58:30 GMT",
"version": "v3"
}
] | 2024-06-21 | [
[
"Ahmed",
"Nasr",
""
],
[
"Pradhan",
"Anirudh",
""
]
] | The existence of Schwarzchild black holes in the structure of Swiss-cheese brane-world led to the argument that this specific brane-world scenario is more realistic than the FLRW branes. In this paper, we show that a Logamediate inflation on the Swiss-cheese brane leads to a positive kinetic term and a negative potenti... |
2004.09690 | Sumanta Chakraborty | Sumanta Chakraborty | Softly broken conformal symmetry with higher curvature terms | v2, 21 pages, no figures, published in PRD | Phys. Rev. D 102, 064030 (2020) | 10.1103/PhysRevD.102.064030 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a scalar-coupled-gravity model, the quadratically divergent counter term
appearing in the mass renormalization of the scalar fields must inherit
corrections arising out of gravitational interactions. In this work we have
explicitly demonstrated that there are no such corrections of gravitational
origin to the quad... | [
{
"created": "Tue, 21 Apr 2020 00:46:16 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Sep 2020 03:41:45 GMT",
"version": "v2"
}
] | 2020-09-15 | [
[
"Chakraborty",
"Sumanta",
""
]
] | In a scalar-coupled-gravity model, the quadratically divergent counter term appearing in the mass renormalization of the scalar fields must inherit corrections arising out of gravitational interactions. In this work we have explicitly demonstrated that there are no such corrections of gravitational origin to the quadra... |
gr-qc/0011028 | Thomas W. Baumgarte | Hwei-Jang Yo, Thomas W. Baumgarte, and Stuart L. Shapiro | Gravitational Wavetrains in the Quasi-Equilibrium Approximation: A Model
Problem in Scalar Gravitation | 15 pages, 14 figures | Phys.Rev. D63 (2001) 064035 | 10.1103/PhysRevD.63.064035 | null | gr-qc astro-ph | null | A quasi-equilibrium (QE) computational scheme was recently developed in
general relativity to calculate the complete gravitational wavetrain emitted
during the inspiral phase of compact binaries. The QE method exploits the fact
that the the gravitational radiation inspiral timescale is much longer than the
orbital pe... | [
{
"created": "Tue, 7 Nov 2000 22:16:00 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Yo",
"Hwei-Jang",
""
],
[
"Baumgarte",
"Thomas W.",
""
],
[
"Shapiro",
"Stuart L.",
""
]
] | A quasi-equilibrium (QE) computational scheme was recently developed in general relativity to calculate the complete gravitational wavetrain emitted during the inspiral phase of compact binaries. The QE method exploits the fact that the the gravitational radiation inspiral timescale is much longer than the orbital peri... |
0809.0701 | Xavier Siemens | Melissa Anholm, Stefan Ballmer, Jolien D. E. Creighton, Larry R.
Price, and Xavier Siemens | Optimal strategies for gravitational wave stochastic background searches
in pulsar timing data | 20 pages, 6 figures. Added figure with sky sensitivity for Parkes
Pulsar Timing Array, included dipole overlap reduction function and
derivation in appendix, extended likelihood discussion | null | 10.1103/PhysRevD.79.084030 | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A low frequency stochastic background of gravitational waves may be detected
by pulsar timing experiments in the next five to ten years. Using methods
developed to analyze interferometric gravitational wave data, in this paper we
lay out the optimal techniques to detect a background of gravitational waves
using a pul... | [
{
"created": "Wed, 3 Sep 2008 20:12:48 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Dec 2008 23:31:23 GMT",
"version": "v2"
}
] | 2015-05-13 | [
[
"Anholm",
"Melissa",
""
],
[
"Ballmer",
"Stefan",
""
],
[
"Creighton",
"Jolien D. E.",
""
],
[
"Price",
"Larry R.",
""
],
[
"Siemens",
"Xavier",
""
]
] | A low frequency stochastic background of gravitational waves may be detected by pulsar timing experiments in the next five to ten years. Using methods developed to analyze interferometric gravitational wave data, in this paper we lay out the optimal techniques to detect a background of gravitational waves using a pulsa... |
1807.11025 | Mahboobeh Roostaee Shahverdi | M. Roostaee, Amir M. Abbassi | F-term Inflation and RSII Brane Mode | 20 pages, 2 figures (.jpg), revtex4-1 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Considering hybrid F-term inflation in RSII model and using the most recent
data from Planck 2018 and in comparison with Planck 2015and WMAP 9-year , we
can obtain some interesting constraints on main parameters of the model. Also,
we attain convenient compatibility between this model and observational data.
We show ... | [
{
"created": "Sun, 29 Jul 2018 09:07:00 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Aug 2018 16:34:30 GMT",
"version": "v2"
}
] | 2018-08-22 | [
[
"Roostaee",
"M.",
""
],
[
"Abbassi",
"Amir M.",
""
]
] | Considering hybrid F-term inflation in RSII model and using the most recent data from Planck 2018 and in comparison with Planck 2015and WMAP 9-year , we can obtain some interesting constraints on main parameters of the model. Also, we attain convenient compatibility between this model and observational data. We show th... |
1003.3486 | Marc Favata | Marc Favata | The gravitational-wave memory effect | 11 pages, 2 figures; proceedings of the 8th Amaldi Conference on
Gravitational Waves (New York, June 2009); accepted for publication in
special issue of Classical and Quantum Gravity | Class. Quant. Grav.27:084036, 2010 | 10.1088/0264-9381/27/8/084036 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The nonlinear memory effect is a slowly-growing, non-oscillatory contribution
to the gravitational-wave amplitude. It originates from gravitational waves
that are sourced by the previously emitted waves. In an ideal
gravitational-wave interferometer a gravitational-wave with memory causes a
permanent displacement of ... | [
{
"created": "Wed, 17 Mar 2010 21:56:48 GMT",
"version": "v1"
}
] | 2010-05-27 | [
[
"Favata",
"Marc",
""
]
] | The nonlinear memory effect is a slowly-growing, non-oscillatory contribution to the gravitational-wave amplitude. It originates from gravitational waves that are sourced by the previously emitted waves. In an ideal gravitational-wave interferometer a gravitational-wave with memory causes a permanent displacement of th... |
1503.05083 | Yoshifumi Hyakutake | Yoshifumi Hyakutake | Boosted Quantum Black Hole and Black String in M-theory, and Quantum
Correction to Gregory-Laflamme Instability | 27 pages, 5 figures. References added and effect of the
compactification for the black hole is discussed around eq. (68) | JHEP09(2015)067 | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We take into account higher derivative R4 corrections in M-theory and
construct quantum black hole and black string solutions in 11 dimensions up to
the next leading order. The quantum black string is stretching along the 11th
direction and the Gregory-Laflamme instability is examined at the quantum
level. Thermodyna... | [
{
"created": "Tue, 17 Mar 2015 14:59:35 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Sep 2015 09:13:49 GMT",
"version": "v2"
}
] | 2017-01-25 | [
[
"Hyakutake",
"Yoshifumi",
""
]
] | We take into account higher derivative R4 corrections in M-theory and construct quantum black hole and black string solutions in 11 dimensions up to the next leading order. The quantum black string is stretching along the 11th direction and the Gregory-Laflamme instability is examined at the quantum level. Thermodynami... |
2311.10481 | Thomas Pappas | Thomas D. Pappas | Theory-agnostic parametrization of wormhole spacetimes | 16 pages, 5 tables, 1 figure; contribution to the proceedings of the
RAGtime conference in Opava. v2: Extended discussion, version to match the
one to appear in Proceedings of RAGtime 23-25 | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We present a generalization of the Rezzolla-Zhidenko theory-agnostic
parametrization of black-hole spacetimes to accommodate spherically-symmetric
Lorentzian, traversable wormholes (WHs) in an arbitrary metric theory of
gravity. By applying our parametrization to various known WH metrics and
performing calculations i... | [
{
"created": "Fri, 17 Nov 2023 12:23:49 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Dec 2023 09:58:33 GMT",
"version": "v2"
}
] | 2023-12-29 | [
[
"Pappas",
"Thomas D.",
""
]
] | We present a generalization of the Rezzolla-Zhidenko theory-agnostic parametrization of black-hole spacetimes to accommodate spherically-symmetric Lorentzian, traversable wormholes (WHs) in an arbitrary metric theory of gravity. By applying our parametrization to various known WH metrics and performing calculations inv... |
1909.05877 | Christopher Munna | Christopher Munna, Charles R. Evans | Eccentric-orbit EMRI radiation: Analytic forms of leading-logarithm and
subleading-logarithm flux terms at high PN orders | 24 pages. Submitted to Phys. Rev. D | Phys. Rev. D 100, 104060 (2019) | 10.1103/PhysRevD.100.104060 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present new results on the analytic eccentricity dependence of several
sequences of gravitational wave flux terms at high post-Newtonian (PN) order
for extreme-mass-ratio inspirals. These sequences are the leading logarithms,
which appear at PN orders $x^{3k} \log^k(x)$ and $x^{3k+3/2} \log^k(x)$ for
integers $k\g... | [
{
"created": "Thu, 12 Sep 2019 18:00:15 GMT",
"version": "v1"
}
] | 2019-12-04 | [
[
"Munna",
"Christopher",
""
],
[
"Evans",
"Charles R.",
""
]
] | We present new results on the analytic eccentricity dependence of several sequences of gravitational wave flux terms at high post-Newtonian (PN) order for extreme-mass-ratio inspirals. These sequences are the leading logarithms, which appear at PN orders $x^{3k} \log^k(x)$ and $x^{3k+3/2} \log^k(x)$ for integers $k\ge ... |
1503.05845 | Ulvi Yurtsever | Ulvi Yurtsever and Steven Wilkinson | Limits and Signatures of Relativistic Spaceflight | 11 pages, 5 figures | null | null | null | gr-qc physics.pop-ph | http://creativecommons.org/licenses/publicdomain/ | While special relativity imposes an absolute speed limit at the speed of
light, our Universe is not empty Minkowski spacetime. The constituents that
fill the interstellar/intergalactic vacuum, including the cosmic microwave
background photons, impose a lower speed limit on any object travelling at
relativistic veloci... | [
{
"created": "Fri, 13 Mar 2015 23:17:10 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Apr 2015 17:55:20 GMT",
"version": "v2"
},
{
"created": "Sat, 18 Apr 2015 21:58:25 GMT",
"version": "v3"
}
] | 2015-04-21 | [
[
"Yurtsever",
"Ulvi",
""
],
[
"Wilkinson",
"Steven",
""
]
] | While special relativity imposes an absolute speed limit at the speed of light, our Universe is not empty Minkowski spacetime. The constituents that fill the interstellar/intergalactic vacuum, including the cosmic microwave background photons, impose a lower speed limit on any object travelling at relativistic velociti... |
2009.10614 | Andrew Sullivan | Andrew Sullivan, Nicol\'as Yunes, Thomas P. Sotiriou | Numerical Black Hole Solutions in Modified Gravity Theories: Axial
Symmetry Case | null | Phys. Rev. D 103, 124058 (2021) | 10.1103/PhysRevD.103.124058 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend a recently developed numerical code to obtain stationary,
axisymmetric solutions that describe rotating black hole spacetimes in a wide
class of modified theories of gravity. The code utilizes a relaxed
Newton-Raphson method to solve the full nonlinear modified Einstein's Equations
on a two-dimensional grid... | [
{
"created": "Tue, 22 Sep 2020 15:17:59 GMT",
"version": "v1"
}
] | 2021-06-30 | [
[
"Sullivan",
"Andrew",
""
],
[
"Yunes",
"Nicolás",
""
],
[
"Sotiriou",
"Thomas P.",
""
]
] | We extend a recently developed numerical code to obtain stationary, axisymmetric solutions that describe rotating black hole spacetimes in a wide class of modified theories of gravity. The code utilizes a relaxed Newton-Raphson method to solve the full nonlinear modified Einstein's Equations on a two-dimensional grid w... |
gr-qc/0411029 | Frank B. Estabrook | Frank B. Estabrook | Mathematical Structure of Tetrad Equations for Vacuum Relativity | Slightly revised. In press, Phys. Rev. D15 | Phys.Rev. D71 (2005) 044004 | 10.1103/PhysRevD.71.044004 | null | gr-qc | null | The tetrad partial differential equations formulated by Buchman and Bardeen
for vacuum gravity are shown to be well posed by calculation of the Cartan
characters of an associated exterior differential system. Gauge specializations
are discussed. A Cartan 4-form is found for this field theory, together with
its intrin... | [
{
"created": "Fri, 5 Nov 2004 19:44:43 GMT",
"version": "v1"
},
{
"created": "Sat, 15 Jan 2005 00:00:07 GMT",
"version": "v2"
},
{
"created": "Mon, 24 Jan 2005 21:49:57 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Estabrook",
"Frank B.",
""
]
] | The tetrad partial differential equations formulated by Buchman and Bardeen for vacuum gravity are shown to be well posed by calculation of the Cartan characters of an associated exterior differential system. Gauge specializations are discussed. A Cartan 4-form is found for this field theory, together with its intrinsi... |
2304.10019 | Shinji Tsujikawa | Shinji Tsujikawa | Black holes in a new gravitational theory with trace anomalies | 14 pages, 1 figure | Phys. Lett. B 843 (2023) 138054 | 10.1016/j.physletb.2023.138054 | WUCG-23-05 | gr-qc hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | In a new gravitational theory with the trace anomaly recently proposed by
Gabadadze, we study the existence of hairy black hole solutions on a static and
spherically symmetric background. In this theory, the effective 4-dimensional
action contains a kinetic term of the conformal scalar field related to a new
scale $b... | [
{
"created": "Thu, 20 Apr 2023 00:15:27 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jul 2023 23:25:54 GMT",
"version": "v2"
}
] | 2023-07-07 | [
[
"Tsujikawa",
"Shinji",
""
]
] | In a new gravitational theory with the trace anomaly recently proposed by Gabadadze, we study the existence of hairy black hole solutions on a static and spherically symmetric background. In this theory, the effective 4-dimensional action contains a kinetic term of the conformal scalar field related to a new scale $bar... |
1703.06282 | Li Tang | Xin Li, Li Tang and Hai-Nan Lin | Comparing the dark matter models, modified Newtonian dynamics and
modified gravity in accounting for the galaxy rotation curves | 12 pages, 3 figures | Chin. Phys. C 41 (2017) 055101 | 10.1088/1674-1137/41/5/055101 | null | gr-qc astro-ph.GA | http://creativecommons.org/licenses/by/4.0/ | We compare six models (including the baryonic model, two dark matter models,
two modified Newtonian dynamics models and one modified gravity model) in
accounting for the galaxy rotation curves. For the dark matter models, we
assume NFW profile and core-modified profile for the dark halo, respectively.
For the modifie... | [
{
"created": "Sat, 18 Mar 2017 10:49:46 GMT",
"version": "v1"
}
] | 2017-05-10 | [
[
"Li",
"Xin",
""
],
[
"Tang",
"Li",
""
],
[
"Lin",
"Hai-Nan",
""
]
] | We compare six models (including the baryonic model, two dark matter models, two modified Newtonian dynamics models and one modified gravity model) in accounting for the galaxy rotation curves. For the dark matter models, we assume NFW profile and core-modified profile for the dark halo, respectively. For the modified ... |
2212.03732 | Michele Lenzi | Michele Lenzi and Carlos F. Sopuerta | Black Hole Greybody Factors from Korteweg-de Vries Integrals: Theory | 22 pages, 5 figures | null | 10.1103/PhysRevD.107.044010 | null | gr-qc hep-th nlin.SI | http://creativecommons.org/licenses/by/4.0/ | The dynamics of perturbed non-rotating black holes (BHs) can be described in
terms of master equations of the wave type with a potential. In the frequency
domain, the master equations become time-independent Schr\"odinger equations
with no discrete spectrum. It has been recently shown that these wave equations
posses... | [
{
"created": "Wed, 7 Dec 2022 15:54:18 GMT",
"version": "v1"
}
] | 2023-02-22 | [
[
"Lenzi",
"Michele",
""
],
[
"Sopuerta",
"Carlos F.",
""
]
] | The dynamics of perturbed non-rotating black holes (BHs) can be described in terms of master equations of the wave type with a potential. In the frequency domain, the master equations become time-independent Schr\"odinger equations with no discrete spectrum. It has been recently shown that these wave equations possess ... |
1201.5362 | Charles Dyer | George Kotsopoulos and Charles C. Dyer | A Domain Wall Solution by Perturbation of the Kasner Spacetime | null | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Plane symmetric perturbations are applied to an axially symmetric Kasner
spacetime which leads to no momentum flow orthogonal to the planes of symmetry.
This flow appears laminar and the structure can be interpreted as a domain
wall. We further extend consideration to the class of Bianchi Type I spacetimes
and obtain... | [
{
"created": "Wed, 25 Jan 2012 20:25:58 GMT",
"version": "v1"
}
] | 2012-01-26 | [
[
"Kotsopoulos",
"George",
""
],
[
"Dyer",
"Charles C.",
""
]
] | Plane symmetric perturbations are applied to an axially symmetric Kasner spacetime which leads to no momentum flow orthogonal to the planes of symmetry. This flow appears laminar and the structure can be interpreted as a domain wall. We further extend consideration to the class of Bianchi Type I spacetimes and obtain c... |
gr-qc/0007018 | Robert D. Klauber | Robert D. Klauber | Non-time-orthogonality, Gravitational Orbits, and Thomas Precession | 7 pages, including 4 figures, abstract, and references | null | null | null | gr-qc | null | Non-time-orthogonal analysis of rotating frames is applied to objects in
gravitational orbits and found to be internally consistent. The object's
surface speed about its axis of rotation, but not its orbital speed, is shown
to be readily detectable by any "enclosed box" experimenter on the surface of
such an object. ... | [
{
"created": "Mon, 10 Jul 2000 17:15:38 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Klauber",
"Robert D.",
""
]
] | Non-time-orthogonal analysis of rotating frames is applied to objects in gravitational orbits and found to be internally consistent. The object's surface speed about its axis of rotation, but not its orbital speed, is shown to be readily detectable by any "enclosed box" experimenter on the surface of such an object. Sa... |
1801.02032 | Ali Kaya | Ali Kaya | Superhorizon Electromagnetic Field Background from Higgs Loops in
Inflation | 20 pages, revtex4-1, v3: comments and an appendix discussing
dimensional regularization added, other minor changes, to appear in JCAP | null | 10.1088/1475-7516/2018/03/046 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If Higgs is a spectator scalar, i.e. if it is not directly coupled to the
inflaton, superhorizon Higgs modes must have been exited during inflation.
Since Higgs is unstable its decay into photons is expected to seed superhorizon
photon modes. We use in-in perturbation theory to show that this naive physical
expectati... | [
{
"created": "Sat, 6 Jan 2018 15:27:29 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Jan 2018 19:37:24 GMT",
"version": "v2"
},
{
"created": "Thu, 22 Mar 2018 14:28:04 GMT",
"version": "v3"
}
] | 2018-04-11 | [
[
"Kaya",
"Ali",
""
]
] | If Higgs is a spectator scalar, i.e. if it is not directly coupled to the inflaton, superhorizon Higgs modes must have been exited during inflation. Since Higgs is unstable its decay into photons is expected to seed superhorizon photon modes. We use in-in perturbation theory to show that this naive physical expectation... |
gr-qc/0506098 | Jiliang Jing | Jiliang Jing and Qiyuan Pan | Dirac Quasinormal frequencies of the Kerr-Newman black hole | 14 pages, 2 figures | Nucl.Phys. B728 (2005) 109-120 | 10.1016/j.nuclphysb.2005.08.038 | null | gr-qc astro-ph hep-th | null | The Dirac quasinormal modes (QNMs) of the Kerr-Newman black hole are
investigated using continued fraction approach. It is shown that the
quasinormal frequencies in the complex $\omega$ plane move counterclockwise as
the charge or angular momentum per unit mass of the black hole increases. They
get a spiral-like shap... | [
{
"created": "Sun, 19 Jun 2005 01:17:56 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Jing",
"Jiliang",
""
],
[
"Pan",
"Qiyuan",
""
]
] | The Dirac quasinormal modes (QNMs) of the Kerr-Newman black hole are investigated using continued fraction approach. It is shown that the quasinormal frequencies in the complex $\omega$ plane move counterclockwise as the charge or angular momentum per unit mass of the black hole increases. They get a spiral-like shape,... |
1902.06745 | Aida Ahmadzadegan | Aida Ahmadzadegan, Fatemeh Lalegani, Achim Kempf, Robert B. Mann | Probing geometric information using the Unruh effect in the vacuum | v2: update to published version | Phys. Rev. D 100, 085013 (2019) | 10.1103/PhysRevD.100.085013 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new method by which, in principle, it is possible to "see in
absolute darkness," i.e., without exchanging any real quanta through quantum
fields. This is possible because objects modify the mode structure of the
vacuum in their vicinity. The new method probes the mode structure of the
vacuum through the ... | [
{
"created": "Mon, 18 Feb 2019 19:00:00 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Oct 2019 15:20:18 GMT",
"version": "v2"
}
] | 2019-10-30 | [
[
"Ahmadzadegan",
"Aida",
""
],
[
"Lalegani",
"Fatemeh",
""
],
[
"Kempf",
"Achim",
""
],
[
"Mann",
"Robert B.",
""
]
] | We present a new method by which, in principle, it is possible to "see in absolute darkness," i.e., without exchanging any real quanta through quantum fields. This is possible because objects modify the mode structure of the vacuum in their vicinity. The new method probes the mode structure of the vacuum through the Un... |
1612.01467 | Stephan Schiller | E. Wiens, A.Yu. Nevsky, and S. Schiller | Resonator with ultra-high length stability as a probe for
Equivalence-Principle-violating physics | to appear in Physical Review Letters (2016) | null | 10.1103/PhysRevLett.117.271102 | null | gr-qc physics.optics quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In order to investigate the long-term dimensional stability of matter, we
have operated an optical resonator fabricated from crystalline silicon at
1.5$\,$K continuously for over one year and repeatedly compared its resonance
frequency $f_{res}$ with the frequency of a GPS-monitored hydrogen maser. After
allowing for... | [
{
"created": "Mon, 5 Dec 2016 18:44:05 GMT",
"version": "v1"
}
] | 2017-02-01 | [
[
"Wiens",
"E.",
""
],
[
"Nevsky",
"A. Yu.",
""
],
[
"Schiller",
"S.",
""
]
] | In order to investigate the long-term dimensional stability of matter, we have operated an optical resonator fabricated from crystalline silicon at 1.5$\,$K continuously for over one year and repeatedly compared its resonance frequency $f_{res}$ with the frequency of a GPS-monitored hydrogen maser. After allowing for a... |
1708.04758 | Luciano Combi | Luciano Combi and Gustavo E. Romero | Gravitational energy and radiation of a charged black hole | 10 pages, accepted for publication in Classical and Quantum Gravity | null | 10.1088/1361-6382/aa86c9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the energy configuration of a charged black hole in the
Teleparallel Framework of General Relativity. We obtain the energy-momentum
tensor of the gravitational field in a stationary frame, and we calculate its
contribution to the total energy of the system. We study the same gravitational
field measured by... | [
{
"created": "Wed, 16 Aug 2017 03:31:19 GMT",
"version": "v1"
}
] | 2017-09-27 | [
[
"Combi",
"Luciano",
""
],
[
"Romero",
"Gustavo E.",
""
]
] | We analyze the energy configuration of a charged black hole in the Teleparallel Framework of General Relativity. We obtain the energy-momentum tensor of the gravitational field in a stationary frame, and we calculate its contribution to the total energy of the system. We study the same gravitational field measured by a... |
gr-qc/9611024 | Radu Ionicioiu | Radu Ionicioiu (DAMTP, University of Cambridge, UK) | Building Blocks in Turaev-Viro Theory | 19 pages, LaTeX, 4 Postscript figures, uses epsf; minor correction | null | null | DAMTP/96-94 | gr-qc | null | We study the form of the Turaev-Viro partition function Z(M) for different
3-manifolds with boundary. We show that for $S^2$ boundaries Z(M) factorizes
into a term which contains the boundary dependence and another which depends
only on the topology of the underlying manifold. From this follows easily the
formula for... | [
{
"created": "Sun, 10 Nov 1996 20:26:11 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Dec 1996 11:57:32 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Ionicioiu",
"Radu",
"",
"DAMTP, University of Cambridge, UK"
]
] | We study the form of the Turaev-Viro partition function Z(M) for different 3-manifolds with boundary. We show that for $S^2$ boundaries Z(M) factorizes into a term which contains the boundary dependence and another which depends only on the topology of the underlying manifold. From this follows easily the formula for t... |
2103.13328 | Bivudutta Mishra Dr. | A.S. Agrawal, S.K. Tripathy, B.Mishra | Gravitational baryogenesis models comparison in f(R) Gravity | 8 pages, 4 figures, Accepted version in Chinese Journal of Physics | Chinese Journal of Physics, 71, 333-340, 2021 | 10.1016/j.cjph.2021.03.004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have studied the gravitational baryogenesis in f(R) theory of gravity with
an anisotropic Bianchi I space-time. The matter field is considered to be that
of perfect fluid. Two models pertaining to specific form of Ricci scalar have
been presented. The baryon-to-entropy ratio has been derived with the some
specific... | [
{
"created": "Sat, 20 Mar 2021 14:03:54 GMT",
"version": "v1"
}
] | 2021-04-01 | [
[
"Agrawal",
"A. S.",
""
],
[
"Tripathy",
"S. K.",
""
],
[
"Mishra",
"B.",
""
]
] | We have studied the gravitational baryogenesis in f(R) theory of gravity with an anisotropic Bianchi I space-time. The matter field is considered to be that of perfect fluid. Two models pertaining to specific form of Ricci scalar have been presented. The baryon-to-entropy ratio has been derived with the some specific f... |
gr-qc/0106005 | Giovanni Amelino-Camelia | Giovanni Amelino-Camelia | Observed threshold anomalies as the first hope of a manifestation of
Planck-length physics | 9 pages, Latex (to appear in proceedings of 9th Marcel Grossmann
Meeting) | null | 10.1142/9789812777386_0285 | null | gr-qc | null | The observations of photons from the BL Lac object Mk501 with energies above
10 TeV and of cosmic rays with energies above the GZK threshold appear to be
inconsistent with conventional theories. Remarkably, among the recent
new-physics proposals of solutions of these threshold paradoxes a prominent
role has been play... | [
{
"created": "Sun, 3 Jun 2001 13:38:57 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Amelino-Camelia",
"Giovanni",
""
]
] | The observations of photons from the BL Lac object Mk501 with energies above 10 TeV and of cosmic rays with energies above the GZK threshold appear to be inconsistent with conventional theories. Remarkably, among the recent new-physics proposals of solutions of these threshold paradoxes a prominent role has been played... |
2408.00154 | N\'ickolas de Aguiar Alves | N\'ickolas de Aguiar Alves, Andre G. S. Landulfo, and Bruno Arderucio
Costa | Positive Mass in General Relativity Without Energy Conditions | 26 pages, 9 figures. v2: improved exposition of main results,
introduction and abstract modified accordingly | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | A long-standing problem in physics is why observed masses are always
positive. While energy conditions in quantum field theory can partly answer
this problem, in this paper we find evidence that classical general relativity
abhors negative masses, without the need for quantum theory or energy
conditions. This is done... | [
{
"created": "Wed, 31 Jul 2024 20:36:33 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Aug 2024 22:54:47 GMT",
"version": "v2"
}
] | 2024-08-14 | [
[
"Alves",
"Níckolas de Aguiar",
""
],
[
"Landulfo",
"Andre G. S.",
""
],
[
"Costa",
"Bruno Arderucio",
""
]
] | A long-standing problem in physics is why observed masses are always positive. While energy conditions in quantum field theory can partly answer this problem, in this paper we find evidence that classical general relativity abhors negative masses, without the need for quantum theory or energy conditions. This is done b... |
1610.07224 | Bishop Mongwane | Bishop Mongwane | On the Hyperbolicity and Stability of $3+1$ Formulations of Metric
$f(R)$ Gravity | 20, pages | Gen Relativ Gravit (2016) 48(11): 152 | 10.1007/s10714-016-2147-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | $3+1$ formulations of the Einstein field equations have become an invaluable
tool in Numerical relativity, having been used successfully in modeling
spacetimes of black hole collisions, stellar collapse and other complex
systems. It is plausible that similar considerations could prove fruitful for
modified gravity th... | [
{
"created": "Sun, 23 Oct 2016 19:44:18 GMT",
"version": "v1"
}
] | 2016-10-25 | [
[
"Mongwane",
"Bishop",
""
]
] | $3+1$ formulations of the Einstein field equations have become an invaluable tool in Numerical relativity, having been used successfully in modeling spacetimes of black hole collisions, stellar collapse and other complex systems. It is plausible that similar considerations could prove fruitful for modified gravity theo... |
1010.2387 | Roger Tagne Wafo | Piotr T. Chru\'sciel and Roger Tagne Wafo | Solutions of quasi-linear wave equations polyhomogeneous at null
infinity in high dimensions | 88 pages, 3 figures | null | null | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove propagation of weighted Sobolev regularity for solutions of the
hyperboloidal Cauchy problem for a class of quasi-linear symmetric hyperbolic
systems, under structure conditions compatible with the Einstein-Maxwell
equations in space-time dimensions $n+1\ge 7$. Similarly we prove propagation
of polyhomogenei... | [
{
"created": "Tue, 12 Oct 2010 13:35:11 GMT",
"version": "v1"
}
] | 2010-10-13 | [
[
"Chruściel",
"Piotr T.",
""
],
[
"Wafo",
"Roger Tagne",
""
]
] | We prove propagation of weighted Sobolev regularity for solutions of the hyperboloidal Cauchy problem for a class of quasi-linear symmetric hyperbolic systems, under structure conditions compatible with the Einstein-Maxwell equations in space-time dimensions $n+1\ge 7$. Similarly we prove propagation of polyhomogeneity... |
gr-qc/0609056 | Pavel Krtous | J. B. Griffiths, P. Krtous, J. Podolsky | Interpreting the C-metric | 22 pages, 14 figures (low-resolution figures; for the version with
high-resolution figures see http://utf.mff.cuni.cz/~krtous/papers/ or
http://www-staff.lboro.ac.uk/~majbg/) | Class.Quant.Grav. 23 (2006) 6745-6766 | 10.1088/0264-9381/23/23/008 | null | gr-qc | null | The basic properties of the C-metric are well known. It describes a pair of
causally separated black holes which accelerate in opposite directions under
the action of forces represented by conical singularities. However, these
properties can be demonstrated much more transparently by making use of
recently developed ... | [
{
"created": "Fri, 15 Sep 2006 15:55:28 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Griffiths",
"J. B.",
""
],
[
"Krtous",
"P.",
""
],
[
"Podolsky",
"J.",
""
]
] | The basic properties of the C-metric are well known. It describes a pair of causally separated black holes which accelerate in opposite directions under the action of forces represented by conical singularities. However, these properties can be demonstrated much more transparently by making use of recently developed co... |
gr-qc/9510053 | Claes R. Cramer | Claes R Cramer | Using the Uncharged Kerr Black Hole as a Gravitational Mirror | 11 pages Latex, 3 Postscript figures, uufiles to compress | Gen.Rel.Grav. 29 (1997) 445-454 | 10.1023/A:1018878515046 | null | gr-qc | null | We extend the study of the possibility to use the Schwarzschild black hole as
a gravitational mirror to the more general case of an uncharged Kerr black
hole. We use the null geodesic equation in the equatorial plane to prove a
theorem concerning the conditions the impact parameter has to satisfy if there
shall exist... | [
{
"created": "Wed, 25 Oct 1995 21:32:33 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Cramer",
"Claes R",
""
]
] | We extend the study of the possibility to use the Schwarzschild black hole as a gravitational mirror to the more general case of an uncharged Kerr black hole. We use the null geodesic equation in the equatorial plane to prove a theorem concerning the conditions the impact parameter has to satisfy if there shall exist b... |
1510.00893 | Yasunari Kurita | Yasunari Kurita, Hiroyuki Nakano | Gravitational waves from dark matter collapse in a star | 25 pages, 5 figures, typos corrected, comments added. Version
accepted by PRD | Phys. Rev. D 93, 023508 (2016) | 10.1103/PhysRevD.93.023508 | null | gr-qc astro-ph.SR hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the collapse of clusters of weakly interacting massive
particles (WIMPs) in the core of a Sun-like star and the possible formation of
mini-black holes and the emission of gravitational waves. When the number of
WIMPs is small, thermal pressure balances the WIMP cluster's self gravity. If
the number of ... | [
{
"created": "Sun, 4 Oct 2015 01:34:18 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Oct 2015 11:53:31 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Jan 2016 11:48:53 GMT",
"version": "v3"
}
] | 2016-01-20 | [
[
"Kurita",
"Yasunari",
""
],
[
"Nakano",
"Hiroyuki",
""
]
] | We investigate the collapse of clusters of weakly interacting massive particles (WIMPs) in the core of a Sun-like star and the possible formation of mini-black holes and the emission of gravitational waves. When the number of WIMPs is small, thermal pressure balances the WIMP cluster's self gravity. If the number of WI... |
1108.0248 | Umpei Miyamoto | Umpei Miyamoto, Sanjay Jhingan, Tomohiro Harada | Weak cosmic censorship in gravitational collapse with astrophysical
parameter values | 10 pages, 2 figures, 1 table; v2: title changed, to appear in
Progress of Theoretical and Experimental Physics | Prog. Theor. Exp. Phys. (2013) 053E01 | 10.1093/ptep/ptt027 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The possible violation of the weak cosmic censorship hypothesis in
astrophysical phenomena can provide us with the information about
trans-Planckian physics through observations. We present negative evidence,
however, that one should not expect such a possibility at least when the
deviation from spherical symmetry is... | [
{
"created": "Mon, 1 Aug 2011 06:41:20 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Mar 2013 01:56:53 GMT",
"version": "v2"
}
] | 2013-05-24 | [
[
"Miyamoto",
"Umpei",
""
],
[
"Jhingan",
"Sanjay",
""
],
[
"Harada",
"Tomohiro",
""
]
] | The possible violation of the weak cosmic censorship hypothesis in astrophysical phenomena can provide us with the information about trans-Planckian physics through observations. We present negative evidence, however, that one should not expect such a possibility at least when the deviation from spherical symmetry is n... |
1108.0931 | Alberto Diez-Tejedor | Juan Barranco, Argelia Bernal, Juan Carlos Degollado, Alberto
Diez-Tejedor, Miguel Megevand, Miguel Alcubierre, Dar\'io N\'u\~nez and
Olivier Sarbach | Are black holes a serious threat to scalar field dark matter models? | 34 pages, 13 figures | Phys. Rev. D 84, 083008 (2011) | 10.1103/PhysRevD.84.083008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Classical scalar fields have been proposed as possible candidates for the
dark matter component of the universe. Given the fact that super-massive black
holes seem to exist at the center of most galaxies, in order to be a viable
candidate for the dark matter halo a scalar field configuration should be
stable in the p... | [
{
"created": "Wed, 3 Aug 2011 20:00:04 GMT",
"version": "v1"
}
] | 2012-08-01 | [
[
"Barranco",
"Juan",
""
],
[
"Bernal",
"Argelia",
""
],
[
"Degollado",
"Juan Carlos",
""
],
[
"Diez-Tejedor",
"Alberto",
""
],
[
"Megevand",
"Miguel",
""
],
[
"Alcubierre",
"Miguel",
""
],
[
"Núñez",
"Darío",
... | Classical scalar fields have been proposed as possible candidates for the dark matter component of the universe. Given the fact that super-massive black holes seem to exist at the center of most galaxies, in order to be a viable candidate for the dark matter halo a scalar field configuration should be stable in the pre... |
gr-qc/0702074 | Muhammad Sharif | Asghar Qadir, M. Sharif and M. Shoaib | The Momentum Four-Vector in the $e\psi$N Formalism and the Angular
Momentum Imparted to Test Particles by Gravitational Waves | 8 pages, LaTex | Nuovo Cim. B115 (2000) 419-425 | null | null | gr-qc | null | Since gravitational waves are solutions of Einstein's field equations with a
zero stress-energy tensor, the reality of these waves was questioned. To
demonstrate it, the momentum imparted to test particles by such waves was
evaluated. A closed form expression for this quantity was provided by Qadir and
Sharif, using ... | [
{
"created": "Wed, 14 Feb 2007 02:56:59 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Qadir",
"Asghar",
""
],
[
"Sharif",
"M.",
""
],
[
"Shoaib",
"M.",
""
]
] | Since gravitational waves are solutions of Einstein's field equations with a zero stress-energy tensor, the reality of these waves was questioned. To demonstrate it, the momentum imparted to test particles by such waves was evaluated. A closed form expression for this quantity was provided by Qadir and Sharif, using an... |
gr-qc/0309118 | Maria J. Pareja | M.J. Pareja | Bounds on the dragging rate and on the rotational mass-energy in slowly
and differentially rotating relativistic stars | 23 pages, latex. Submitted to J. Math. Phys | null | 10.1063/1.1767987 | null | gr-qc | null | For relativistic stars rotating slowly and differentially with a positive
angular velocity, some properties in relation to the positiveness of the rate
of rotational dragging and of the angular momentum density are derived. Also, a
new proof for the bounds on the rotational mass-energy is given.
| [
{
"created": "Thu, 25 Sep 2003 10:21:08 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Pareja",
"M. J.",
""
]
] | For relativistic stars rotating slowly and differentially with a positive angular velocity, some properties in relation to the positiveness of the rate of rotational dragging and of the angular momentum density are derived. Also, a new proof for the bounds on the rotational mass-energy is given. |
1602.08779 | Oleg Zaslavskii | O. B. Zaslavskii | Black hole with a scalar field as a particle accelerator | 26 pages. Substantially expanded. We present full list of possible
scenarios with unbounded E_c.m. for a given system | Int. Journal of Mod. Physics D, Vol. 26 (2017) 1750108 | 10.1142/S0218271817501085 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider stationary axially symmetric black holes with the background
scalar field and test particles that can interact with this field directly.
Then, particle collision near a black hole can lead to the unbounded energy $%
E_{c.m.}$ in the centre of mass frame (contrary to some recent claims in
literature). This... | [
{
"created": "Sun, 28 Feb 2016 22:27:54 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Jun 2016 09:44:26 GMT",
"version": "v2"
},
{
"created": "Thu, 22 Sep 2016 16:02:14 GMT",
"version": "v3"
}
] | 2017-09-22 | [
[
"Zaslavskii",
"O. B.",
""
]
] | We consider stationary axially symmetric black holes with the background scalar field and test particles that can interact with this field directly. Then, particle collision near a black hole can lead to the unbounded energy $% E_{c.m.}$ in the centre of mass frame (contrary to some recent claims in literature). This h... |
2006.01879 | Emilio Elizalde | Emilio Elizalde, Martiros Khurshudyan, Sergei D. Odintsov, Ratbay
Myrzakulov | An analysis of the $H_{0}$ tension problem in a universe with a viscous
dark fluid | 13 pages, 4 figures | null | 10.1103/PhysRevD.102.123501 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, two inhomogeneous single fluid models for the Universe, which
are able to naturally solve the $H_{0}$ tension problem, are discussed. The
analysis is based on a Bayesian Machine Learning approach that uses a
generative process. The adopted method allows to constrain the free parameters
of each model by... | [
{
"created": "Tue, 2 Jun 2020 18:56:18 GMT",
"version": "v1"
}
] | 2020-12-09 | [
[
"Elizalde",
"Emilio",
""
],
[
"Khurshudyan",
"Martiros",
""
],
[
"Odintsov",
"Sergei D.",
""
],
[
"Myrzakulov",
"Ratbay",
""
]
] | In this paper, two inhomogeneous single fluid models for the Universe, which are able to naturally solve the $H_{0}$ tension problem, are discussed. The analysis is based on a Bayesian Machine Learning approach that uses a generative process. The adopted method allows to constrain the free parameters of each model by u... |
1210.8066 | Jonathan R. Gair | Jonathan R Gair and Edward K Porter | Observing extreme-mass-ratio inspirals with eLISA/NGO | 6 pages, 1 figure, to appear in proceedings of ninth LISA Symposium | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The extreme-mass-ratio inspirals (EMRIs) of stellar mass compact objects into
massive black holes in the centres of galaxies are an important source of
low-frequency gravitational waves for space-based detectors. We discuss the
prospects for detecting these sources with the evolved Laser Interferometer
Space Antenna ... | [
{
"created": "Tue, 30 Oct 2012 16:12:16 GMT",
"version": "v1"
}
] | 2012-10-31 | [
[
"Gair",
"Jonathan R",
""
],
[
"Porter",
"Edward K",
""
]
] | The extreme-mass-ratio inspirals (EMRIs) of stellar mass compact objects into massive black holes in the centres of galaxies are an important source of low-frequency gravitational waves for space-based detectors. We discuss the prospects for detecting these sources with the evolved Laser Interferometer Space Antenna (e... |
2312.02714 | Hanif Golchin | Amid Sadeghi Nezhad, Mohammad Reza Mehdizadeh and Hanif Golchin | The effect of redshift function on the Weak Energy Conditions in f(R)
Wormholes | 27 pages, 10 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In the present paper, we investigate traversable wormhole solutions
determined by an exponential shape function and fractional redshift function in
the background of four viable $f(R)$ models. Although in the absence of the
redshift function $\varphi(r)$ the null energy condition (NEC) and weak energy
condition (WEC)... | [
{
"created": "Tue, 5 Dec 2023 12:18:27 GMT",
"version": "v1"
}
] | 2023-12-06 | [
[
"Nezhad",
"Amid Sadeghi",
""
],
[
"Mehdizadeh",
"Mohammad Reza",
""
],
[
"Golchin",
"Hanif",
""
]
] | In the present paper, we investigate traversable wormhole solutions determined by an exponential shape function and fractional redshift function in the background of four viable $f(R)$ models. Although in the absence of the redshift function $\varphi(r)$ the null energy condition (NEC) and weak energy condition (WEC) a... |
1905.02150 | Oleg Zaslavskii | A. V. Toporensky and O. B. Zaslavskii | On strategies of motion under the black hole horizon | Matches journal version | Int. J. of Mod. Phys. D (2020) 2030003 | 10.1142/S0218271820300037 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this methodological paper we consider two problems an astronaut faces with
under the black hole horizon in the Schwarzschild metric. 1) How to maximize
the survival proper time. 2) How to make a visible part of the outer Universe
as large as possible before hitting the singularity. Our consideration
essentially us... | [
{
"created": "Mon, 6 May 2019 17:09:08 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Mar 2020 11:59:12 GMT",
"version": "v2"
}
] | 2020-04-15 | [
[
"Toporensky",
"A. V.",
""
],
[
"Zaslavskii",
"O. B.",
""
]
] | In this methodological paper we consider two problems an astronaut faces with under the black hole horizon in the Schwarzschild metric. 1) How to maximize the survival proper time. 2) How to make a visible part of the outer Universe as large as possible before hitting the singularity. Our consideration essentially uses... |
0804.0555 | Gamal G.L. Nashed | Gamal G.L. Nashed | M{\o}ller's energy of the Kerr-NUT Metric | 6 pages Latex | Chin.Phys.Lett.25:1202,2008 | 10.1088/0256-307X/25/4/011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The energy distribution of the Kerr-NUT space-time is calculated using M\o
ller's energy-momentum complex within the framework of the Riemannian geometry.
| [
{
"created": "Thu, 3 Apr 2008 13:37:35 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Nashed",
"Gamal G. L.",
""
]
] | The energy distribution of the Kerr-NUT space-time is calculated using M\o ller's energy-momentum complex within the framework of the Riemannian geometry. |
2108.01782 | Valerio Faraoni | Genevi\`eve Vachon, Robert Vanderwee, and Valerio Faraoni | Revisiting geodesic observers in cosmology | 9 pages, no figures | null | 10.1140/epjc/s10052-021-09636-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Geodesic observers in cosmology are revisited. The coordinates based on
freely falling observers introduced by Gautreau in de Sitter and Einstein-de
Sitter spaces (and, previously, by Gautreau and Hoffmann in Schwarzschild
space) are extended to general FLRW universes. We identify situations in which
the relation bet... | [
{
"created": "Tue, 3 Aug 2021 22:59:06 GMT",
"version": "v1"
}
] | 2021-10-04 | [
[
"Vachon",
"Geneviève",
""
],
[
"Vanderwee",
"Robert",
""
],
[
"Faraoni",
"Valerio",
""
]
] | Geodesic observers in cosmology are revisited. The coordinates based on freely falling observers introduced by Gautreau in de Sitter and Einstein-de Sitter spaces (and, previously, by Gautreau and Hoffmann in Schwarzschild space) are extended to general FLRW universes. We identify situations in which the relation betwe... |
1707.08174 | Sushant Ghosh Prof | Sushant G. Ghosh | Noncommutative geometry inspired Einstein-Gauss-Bonnet black holes | 12 pages, 6 figures, 2 tables | Classical and Quantum Gravity, 35, 085008 (2018) | 10.1088/1361-6382/aaaead | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Low energy limits of a string theory suggest that the gravity action should
include quadratic and higher-order curvature terms, in the form of
dimensionally continued Gauss-Bonnet densities. Einstein-Gauss-Bonnet is a
natural extension of the general relativity to higher dimensions in which the
first and second-order... | [
{
"created": "Sat, 22 Jul 2017 09:00:27 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Jun 2018 04:32:57 GMT",
"version": "v2"
}
] | 2018-06-19 | [
[
"Ghosh",
"Sushant G.",
""
]
] | Low energy limits of a string theory suggest that the gravity action should include quadratic and higher-order curvature terms, in the form of dimensionally continued Gauss-Bonnet densities. Einstein-Gauss-Bonnet is a natural extension of the general relativity to higher dimensions in which the first and second-order t... |
2003.03359 | Sylvia Zhu | Sylvia J. Zhu, Masha Baryakhtar, Maria Alessandra Papa, Daichi Tsuna,
Norita Kawanaka, Heinz-Bernd Eggenstein | Characterizing the continuous gravitational-wave signal from boson
clouds around Galactic isolated black holes | 21 pages of main text plus appendices. Accepted by PRD | Phys. Rev. D 102, 063020 (2020) | 10.1103/PhysRevD.102.063020 | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Ultralight bosons can form large clouds around stellar-mass black holes via
the superradiance instability. Through processes such as annihilation, these
bosons can source continuous gravitational wave signals with frequencies within
the range of LIGO and Virgo. If boson annihilation occurs, then the Galactic
black ho... | [
{
"created": "Fri, 6 Mar 2020 18:40:36 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Sep 2020 13:05:17 GMT",
"version": "v2"
}
] | 2020-09-30 | [
[
"Zhu",
"Sylvia J.",
""
],
[
"Baryakhtar",
"Masha",
""
],
[
"Papa",
"Maria Alessandra",
""
],
[
"Tsuna",
"Daichi",
""
],
[
"Kawanaka",
"Norita",
""
],
[
"Eggenstein",
"Heinz-Bernd",
""
]
] | Ultralight bosons can form large clouds around stellar-mass black holes via the superradiance instability. Through processes such as annihilation, these bosons can source continuous gravitational wave signals with frequencies within the range of LIGO and Virgo. If boson annihilation occurs, then the Galactic black hole... |
1911.02517 | Robert Bluhm | Robert Bluhm | The SME with gravity and explicit diffeomorphism breaking | Proceedings of the 8th Meeting on CPT and Lorentz Symmetry | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This overview looks at what happens when the Standard-Model Extension (SME)
is used to investigate gravity theories with explicit diffeomorphism breaking.
It is shown that when matter-gravity couplings are included, the SME generally
maintains consistency with the Bianchi identities, and it therefore provides a
usefu... | [
{
"created": "Wed, 6 Nov 2019 17:55:31 GMT",
"version": "v1"
}
] | 2019-11-07 | [
[
"Bluhm",
"Robert",
""
]
] | This overview looks at what happens when the Standard-Model Extension (SME) is used to investigate gravity theories with explicit diffeomorphism breaking. It is shown that when matter-gravity couplings are included, the SME generally maintains consistency with the Bianchi identities, and it therefore provides a useful ... |
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