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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2007.04123 | Carlos A. Batista da S. Filho | Thiago M. Mergulh\~ao and Carlos Batista | On the Equivalence of Spacetimes, the Cartan-Karlhede Algorithm | Didactic paper, intended to beginners on the field. 13 pages | Rev. Bras. Ensino F\'is. vol.42 (2020), e20200041 | 10.1590/1806-9126-rbef-2020-0041 | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that in general relativity theory two spacetimes whose
metrics are related by a coordinate transformation are physically equivalent.
However, given two line elements, it is virtually impossible to implement the
most general coordinate transformation in order to check the equivalence of the
spacetimes... | [
{
"created": "Wed, 8 Jul 2020 13:45:37 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Jul 2020 15:01:56 GMT",
"version": "v2"
}
] | 2020-08-03 | [
[
"Mergulhão",
"Thiago M.",
""
],
[
"Batista",
"Carlos",
""
]
] | It is well known that in general relativity theory two spacetimes whose metrics are related by a coordinate transformation are physically equivalent. However, given two line elements, it is virtually impossible to implement the most general coordinate transformation in order to check the equivalence of the spacetimes. ... |
2209.05608 | Maciej Maliborski | Jo\"el Kurzweil and Maciej Maliborski | Resonant Dynamics and the Instability of the Box Minkowski Model | 30 pages, 14 figures, v2: matches published version | null | 10.1103/PhysRevD.106.124020 | null | gr-qc math-ph math.AP math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the box Minkowski model [Phys. Rev. Lett. 109, 221101 (2012)] and
provide a strong argument that, subject to the Dirichlet boundary condition, it
is unstable toward black hole formation for arbitrarily small generic
perturbations. Using weakly nonlinear perturbation theory, we derive the
resonant system, w... | [
{
"created": "Mon, 12 Sep 2022 20:56:41 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Jan 2023 13:33:10 GMT",
"version": "v2"
}
] | 2023-01-11 | [
[
"Kurzweil",
"Joël",
""
],
[
"Maliborski",
"Maciej",
""
]
] | We revisit the box Minkowski model [Phys. Rev. Lett. 109, 221101 (2012)] and provide a strong argument that, subject to the Dirichlet boundary condition, it is unstable toward black hole formation for arbitrarily small generic perturbations. Using weakly nonlinear perturbation theory, we derive the resonant system, whi... |
gr-qc/0611032 | Dr. Anirudh Pradhan | Mahesh Kumar Yadav, Anju Rai and Anirudh Pradhan | Some Bianchi Type III String Cosmological Models with Bulk Viscosity | 12 pages, no figure. To appear in Int. J. Theor. Phys | Int.J.Theor.Phys.46:2677-2687,2007 | 10.1007/s10773-007-9381-7 | null | gr-qc | null | We investigate the integrability of cosmic strings in Bianchi III space-time
in presence of a bulk viscous fluid by applying a new technique. The behaviour
of the model is reduced to the solution of a single second order nonlinear
differential equation. We show that this equation admits an infinite family of
solution... | [
{
"created": "Sun, 5 Nov 2006 12:45:07 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Dec 2006 10:50:23 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Yadav",
"Mahesh Kumar",
""
],
[
"Rai",
"Anju",
""
],
[
"Pradhan",
"Anirudh",
""
]
] | We investigate the integrability of cosmic strings in Bianchi III space-time in presence of a bulk viscous fluid by applying a new technique. The behaviour of the model is reduced to the solution of a single second order nonlinear differential equation. We show that this equation admits an infinite family of solutions.... |
1507.08194 | Dah-Wei Chiou | Steven Carlip, Dah-Wei Chiou, Wei-Tou Ni, Richard Woodard | Quantum Gravity: A Brief History of Ideas and Some Prospects | Invited review article. A few parts based on arXiv:1410.1486 and
arXiv:1412.4362. To appear in Int. J. Mod. Phys. D and in "One Hundred Years
of General Relativity: From Genesis and Empirical Foundations to
Gravitational Waves, Cosmology and Quantum Gravity," edited by Wei-Tou Ni
(World Scientific, Singapore, 2... | Int. J. Mod. Phys. D, Vol. 24, No. 11 (2015) 1530028 | 10.1142/S0218271815300281 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a bird's-eye survey on the development of fundamental ideas of
quantum gravity, placing emphasis on perturbative approaches, string theory,
loop quantum gravity, and black hole thermodynamics. The early ideas at the
dawn of quantum gravity as well as the possible observations of quantum
gravitational effec... | [
{
"created": "Wed, 29 Jul 2015 15:52:13 GMT",
"version": "v1"
}
] | 2016-02-03 | [
[
"Carlip",
"Steven",
""
],
[
"Chiou",
"Dah-Wei",
""
],
[
"Ni",
"Wei-Tou",
""
],
[
"Woodard",
"Richard",
""
]
] | We present a bird's-eye survey on the development of fundamental ideas of quantum gravity, placing emphasis on perturbative approaches, string theory, loop quantum gravity, and black hole thermodynamics. The early ideas at the dawn of quantum gravity as well as the possible observations of quantum gravitational effects... |
gr-qc/9501028 | Robert Bruce Mann | K.C.K. Chan and R.B. Mann | Exact Black Hole and Cosmological Solutions in a Two-Dimensional
Dilaton-Spectator Theory of Gravity | 34 pgs. Plain Tex, revised version contains some clarifying comments
concerning the relationship between the constants of integration and the
coupling constants. | Class.Quant.Grav.12:1609-1640,1995 | 10.1088/0264-9381/12/7/006 | WATPHYS TH-94/10 | gr-qc | null | Exact black hole and cosmological solutions are obtained for a special
two-dimensional dilaton-spectator ($\phi-\psi$) theory of gravity. We show how
in this context any desired spacetime behaviour can be determined by an
appropriate choice of a dilaton potential function $V(\phi)$ and a ``coupling
function'' $l(\phi... | [
{
"created": "Tue, 24 Jan 1995 14:11:36 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Mar 1995 14:40:48 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Chan",
"K. C. K.",
""
],
[
"Mann",
"R. B.",
""
]
] | Exact black hole and cosmological solutions are obtained for a special two-dimensional dilaton-spectator ($\phi-\psi$) theory of gravity. We show how in this context any desired spacetime behaviour can be determined by an appropriate choice of a dilaton potential function $V(\phi)$ and a ``coupling function'' $l(\phi)$... |
0910.3352 | Vladimir Dzhunushaliev | Vladimir Dzhunushaliev | Asymptotically flat gravitating spinor field solutions. Step 1 - the
statement of the problem and the comparison with confinement problem in QCD | 3 pages | null | null | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The situation with asymptotically flat gravitating spinor field solutions is
considered. It is supposed that the problem of constructing these solutions is
connected with confinement problem in quantum chromodynamics. It is argued that
in both cases we must use a nonperturbative quantum technique.
| [
{
"created": "Sun, 18 Oct 2009 04:57:43 GMT",
"version": "v1"
}
] | 2009-10-20 | [
[
"Dzhunushaliev",
"Vladimir",
""
]
] | The situation with asymptotically flat gravitating spinor field solutions is considered. It is supposed that the problem of constructing these solutions is connected with confinement problem in quantum chromodynamics. It is argued that in both cases we must use a nonperturbative quantum technique. |
1712.02668 | James Lucietti | Hari K. Kunduri, James Lucietti | No static bubbling spacetimes in higher dimensional Einstein-Maxwell
theory | 9 pages. v2: minor edits, references added | Class. Quantum Grav. 35 054003 (2018) | 10.1088/1361-6382/aaa744 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove that any asymptotically flat static spacetime in higher dimensional
Einstein-Maxwell theory must have no magnetic field. This implies that there
are no static soliton spacetimes and completes the classification of static
non-extremal black holes in this theory. In particular, these results establish
that the... | [
{
"created": "Thu, 7 Dec 2017 15:26:47 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Feb 2018 16:32:18 GMT",
"version": "v2"
}
] | 2018-02-02 | [
[
"Kunduri",
"Hari K.",
""
],
[
"Lucietti",
"James",
""
]
] | We prove that any asymptotically flat static spacetime in higher dimensional Einstein-Maxwell theory must have no magnetic field. This implies that there are no static soliton spacetimes and completes the classification of static non-extremal black holes in this theory. In particular, these results establish that there... |
2311.01424 | Maria-Jose Guzman | Maria-Jose Guzman | The Hamiltonian constraint in the symmetric teleparallel equivalent of
general relativity | 12 pages, no figures; v2: crucial mistake corrected, updated
discussion, comments welcome | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | General relativity (GR) admits two alternative formulations with the same
dynamics attributing the gravitational phenomena to torsion or nonmetricity of
the manifold's connection. They lead, respectively, to the teleparallel
equivalent of general relativity (TEGR) and the symmetric teleparallel
equivalent of general ... | [
{
"created": "Thu, 2 Nov 2023 17:38:52 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Apr 2024 16:28:34 GMT",
"version": "v2"
}
] | 2024-04-24 | [
[
"Guzman",
"Maria-Jose",
""
]
] | General relativity (GR) admits two alternative formulations with the same dynamics attributing the gravitational phenomena to torsion or nonmetricity of the manifold's connection. They lead, respectively, to the teleparallel equivalent of general relativity (TEGR) and the symmetric teleparallel equivalent of general re... |
0904.1851 | Douglas A. Singleton | Merab Gogberashvili, Shynaray Myrzakul, and Douglas Singleton | Standing gravitational waves from domain walls | 4 pages two-column format, no figures, added discussion of physical
meaning of solution, added refernces, to be published PRD | Phys.Rev.D80:024040,2009 | 10.1103/PhysRevD.80.024040 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a plane symmetric, standing gravitational wave for a domain wall
plus a massless scalar field. The scalar field can be associated with a fluid
which has the properties of `stiff' matter, i.e. matter in which the speed of
sound equals the speed of light. Although domain walls are observationally
ruled out... | [
{
"created": "Sun, 12 Apr 2009 11:04:15 GMT",
"version": "v1"
},
{
"created": "Sun, 19 Jul 2009 09:40:16 GMT",
"version": "v2"
}
] | 2010-03-26 | [
[
"Gogberashvili",
"Merab",
""
],
[
"Myrzakul",
"Shynaray",
""
],
[
"Singleton",
"Douglas",
""
]
] | We construct a plane symmetric, standing gravitational wave for a domain wall plus a massless scalar field. The scalar field can be associated with a fluid which has the properties of `stiff' matter, i.e. matter in which the speed of sound equals the speed of light. Although domain walls are observationally ruled out i... |
gr-qc/0111013 | David Wands | David Langlois (1), Kei-ichi Maeda (2) and David Wands (3) ((1) IAP,
(2) Waseda, (3) Portsmouth) | Conservation laws for collisions of branes (or shells) in general
relativity | 5 pages, revtex with epsf, 3 figures; revised version, minor changes,
to appear in Physical Review Letters | Phys.Rev.Lett. 88 (2002) 181301 | 10.1103/PhysRevLett.88.181301 | null | gr-qc astro-ph hep-th | null | We consider the collision of self-gravitating n-branes in a (n+2)-dimensional
spacetime. We show that there is a geometrical constraint which can be
expressed as a simple sum rule for angles characterizing Lorentz boosts between
branes and the intervening spacetime regions. This constraint can then be
re-interpreted ... | [
{
"created": "Mon, 5 Nov 2001 14:33:02 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Apr 2002 09:06:24 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Langlois",
"David",
""
],
[
"Maeda",
"Kei-ichi",
""
],
[
"Wands",
"David",
""
]
] | We consider the collision of self-gravitating n-branes in a (n+2)-dimensional spacetime. We show that there is a geometrical constraint which can be expressed as a simple sum rule for angles characterizing Lorentz boosts between branes and the intervening spacetime regions. This constraint can then be re-interpreted as... |
1512.07095 | Runqiu Yang | Rong-Gen Cai and Run-Qiu Yang | Scaling Laws in Gravitational Collapse | 5 pages, 1 figure | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper presents two interesting scaling laws, which relate some critical
exponents in the critical behavior of spherically symmetric gravitational
collapses. These scaling laws are independent of the details of gravity theory
under consideration and share similar forms as those in thermodynamic and
geometrical ph... | [
{
"created": "Tue, 22 Dec 2015 14:15:32 GMT",
"version": "v1"
}
] | 2015-12-23 | [
[
"Cai",
"Rong-Gen",
""
],
[
"Yang",
"Run-Qiu",
""
]
] | This paper presents two interesting scaling laws, which relate some critical exponents in the critical behavior of spherically symmetric gravitational collapses. These scaling laws are independent of the details of gravity theory under consideration and share similar forms as those in thermodynamic and geometrical phas... |
gr-qc/9907092 | Stoytcho Yazadjiev | S.Yazadjiev | Newman-Janis method and rotating dilaton-axion black hole | 6 pages, latex | Gen.Rel.Grav.32:2345-2352,2000 | 10.1023/A:1002080003862 | SUTH 99-15 | gr-qc | null | It's shown that the rotating dilaton-axion black hole solution can be
obtained from GGHS static charged dilaton black hole solution via Newman-Janis
method.
| [
{
"created": "Wed, 28 Jul 1999 13:09:37 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Yazadjiev",
"S.",
""
]
] | It's shown that the rotating dilaton-axion black hole solution can be obtained from GGHS static charged dilaton black hole solution via Newman-Janis method. |
1704.02572 | Hamid Reza Sepangi | M. Honardoost, D. F. Mota, H. R. Sepangi | Symmetron with a non-minimal kinetic term | 12 pages, 4 figures, to appear in JCAP | JCAP 11 (2017) 018 | 10.1088/1475-7516/2017/11/018 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the compatibility of the Symmetron with dark energy by
introducing a non-minimal kinetic term associated with the Symmetron. In this
new model, the effect of the friction term appearing in the equation of motion
of the Symmetron field becomes more pronounced due to the non-minimal kinetic
term appearin... | [
{
"created": "Sun, 9 Apr 2017 08:36:16 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Nov 2017 11:27:54 GMT",
"version": "v2"
}
] | 2017-11-29 | [
[
"Honardoost",
"M.",
""
],
[
"Mota",
"D. F.",
""
],
[
"Sepangi",
"H. R.",
""
]
] | We investigate the compatibility of the Symmetron with dark energy by introducing a non-minimal kinetic term associated with the Symmetron. In this new model, the effect of the friction term appearing in the equation of motion of the Symmetron field becomes more pronounced due to the non-minimal kinetic term appearing ... |
2208.09302 | Jaros{\l}aw Kopi\'nski | A. Rod Gover and Jaros{\l}aw Kopi\'nski | Higher fundamental forms of the conformal boundary of asymptotically de
Sitter spacetimes | 24 pages | Class. Quantum Grav. 40 015001 2023 | 10.1088/1361-6382/aca459 | null | gr-qc math.DG | http://creativecommons.org/licenses/by/4.0/ | We provide a partial characterization of the conformal infinity of
asymptotically de Sitter spacetimes by deriving constraints that relate the
asymptotics of the stress-energy tensor with conformal geometric data. The
latter is captured using recently defined objects, called higher conformal
fundamental forms. For th... | [
{
"created": "Fri, 19 Aug 2022 12:30:20 GMT",
"version": "v1"
}
] | 2023-02-16 | [
[
"Gover",
"A. Rod",
""
],
[
"Kopiński",
"Jarosław",
""
]
] | We provide a partial characterization of the conformal infinity of asymptotically de Sitter spacetimes by deriving constraints that relate the asymptotics of the stress-energy tensor with conformal geometric data. The latter is captured using recently defined objects, called higher conformal fundamental forms. For the ... |
2305.13761 | Salih Kibaro\u{g}lu | Salih Kibaro\u{g}lu | Modified Friedmann Equations from Maxwell-Weyl Gauge Theory | 20 pages | Nucl. Phys. B 1006 (2024) 116634 | 10.1016/j.nuclphysb.2024.116634 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This study investigates the possibility of a homogeneous and isotropic
cosmological solution within the context of the Maxwell-Weyl gauge theory of
gravity. To achieve this, we utilize the Einstein-Yang-Mills theory as an
analogy and represent the Maxwell gauge field in terms of two time-dependent
scalar fields. We d... | [
{
"created": "Tue, 23 May 2023 07:25:16 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Jul 2024 06:50:41 GMT",
"version": "v2"
}
] | 2024-07-26 | [
[
"Kibaroğlu",
"Salih",
""
]
] | This study investigates the possibility of a homogeneous and isotropic cosmological solution within the context of the Maxwell-Weyl gauge theory of gravity. To achieve this, we utilize the Einstein-Yang-Mills theory as an analogy and represent the Maxwell gauge field in terms of two time-dependent scalar fields. We der... |
0805.2997 | Hector Calderon | Hector H. Calderon (Montana State University) | Quantum fields near phantom-energy `sudden' singularities | 6 pages RevTeX | Phys.Rev.D78:044041,2008 | 10.1103/PhysRevD.78.044041 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is committed to calculations near a type of future singularity
driven by phantom energy. At the singularities considered, the scale factor
remains finite but its derivative diverges. The general behavior of barotropic
phantom energy producing this singularity is calculated under the assumption
that near th... | [
{
"created": "Tue, 20 May 2008 03:18:52 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Calderon",
"Hector H.",
"",
"Montana State University"
]
] | This paper is committed to calculations near a type of future singularity driven by phantom energy. At the singularities considered, the scale factor remains finite but its derivative diverges. The general behavior of barotropic phantom energy producing this singularity is calculated under the assumption that near the ... |
1905.06011 | Nathan Johnson-McDaniel | Tim Dietrich, Anuradha Samajdar, Sebastian Khan, Nathan K.
Johnson-McDaniel, Reetika Dudi, Wolfgang Tichy | Improving the NRTidal model for binary neutron star systems | Accepted manuscript | Phys. Rev. D 100, 044003 (2019) | 10.1103/PhysRevD.100.044003 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Accurate and fast gravitational waveform (GW) models are essential to extract
information about the properties of compact binary systems that generate GWs.
Building on previous work, we present an extension of the NRTidal model for
binary neutron star (BNS) waveforms. The upgrades are: (i) a new closed-form
expressio... | [
{
"created": "Wed, 15 May 2019 08:05:10 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Jul 2019 10:05:00 GMT",
"version": "v2"
}
] | 2019-08-07 | [
[
"Dietrich",
"Tim",
""
],
[
"Samajdar",
"Anuradha",
""
],
[
"Khan",
"Sebastian",
""
],
[
"Johnson-McDaniel",
"Nathan K.",
""
],
[
"Dudi",
"Reetika",
""
],
[
"Tichy",
"Wolfgang",
""
]
] | Accurate and fast gravitational waveform (GW) models are essential to extract information about the properties of compact binary systems that generate GWs. Building on previous work, we present an extension of the NRTidal model for binary neutron star (BNS) waveforms. The upgrades are: (i) a new closed-form expression ... |
2407.15207 | Miguel Cruz | Miguel Cruz, Norman Cruz and Samuel Lepe | Thermodynamics inconsistencies in cosmological unimodular gravity models | 8 pages, no figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study the thermodynamics of a cosmological unimodular gravity
model at late times by considering two different energy diffusion functions
that emerges in these scenarios, and that encodes the current for the
non-conservation of the energy-momentum tensor, usually termed as $Q(t)$.
Specifically, we dis... | [
{
"created": "Sun, 21 Jul 2024 16:13:28 GMT",
"version": "v1"
}
] | 2024-07-23 | [
[
"Cruz",
"Miguel",
""
],
[
"Cruz",
"Norman",
""
],
[
"Lepe",
"Samuel",
""
]
] | In this work we study the thermodynamics of a cosmological unimodular gravity model at late times by considering two different energy diffusion functions that emerges in these scenarios, and that encodes the current for the non-conservation of the energy-momentum tensor, usually termed as $Q(t)$. Specifically, we discu... |
2103.06718 | Katarina Martinovic | Katarina Martinovic, Charles Badger, Mairi Sakellariadou, Vuk Mandic | Searching for parity violation with the LIGO-Virgo-KAGRA network | 6 pages, 5 figures | Phys. Rev. D 104, 081101 (2021) | 10.1103/PhysRevD.104.L081101 | null | gr-qc hep-ph | http://creativecommons.org/licenses/by/4.0/ | A stochastic gravitational wave background is expected to emerge from the
superposition of numerous gravitational wave sources of both astrophysical and
cosmological origin. A number of cosmological models can have a parity
violation, resulting in the generation of circularly polarised gravitational
waves. We present... | [
{
"created": "Thu, 11 Mar 2021 15:04:15 GMT",
"version": "v1"
}
] | 2021-10-13 | [
[
"Martinovic",
"Katarina",
""
],
[
"Badger",
"Charles",
""
],
[
"Sakellariadou",
"Mairi",
""
],
[
"Mandic",
"Vuk",
""
]
] | A stochastic gravitational wave background is expected to emerge from the superposition of numerous gravitational wave sources of both astrophysical and cosmological origin. A number of cosmological models can have a parity violation, resulting in the generation of circularly polarised gravitational waves. We present a... |
2107.08519 | Ayan Mitra | Ayan Mitra, Vasilios Zarikas, Alfio Bonanno, Michael Good, Ertan
G\"udekli | Constraining the swiss-cheese IR-fixed point cosmology with cosmic
expansion | 12 pages, 6 figures. Accepted in Universe, MDPI | Universe 2021 | 10.3390/universe7080263 | 7(8):263 | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent work, it has been proposed that the recent cosmic passage to a
cosmic acceleration era is the result of the existence of small anti-gravity
sources in each galaxy and clusters of galaxies. In particular, a swiss-cheese
cosmology model which relativistically integrates the contribution of all these
anti-gr... | [
{
"created": "Sun, 18 Jul 2021 19:14:42 GMT",
"version": "v1"
}
] | 2021-07-27 | [
[
"Mitra",
"Ayan",
""
],
[
"Zarikas",
"Vasilios",
""
],
[
"Bonanno",
"Alfio",
""
],
[
"Good",
"Michael",
""
],
[
"Güdekli",
"Ertan",
""
]
] | In a recent work, it has been proposed that the recent cosmic passage to a cosmic acceleration era is the result of the existence of small anti-gravity sources in each galaxy and clusters of galaxies. In particular, a swiss-cheese cosmology model which relativistically integrates the contribution of all these anti-grav... |
gr-qc/0309094 | Stephane Fay | Stephane Fay | Isotropisation of Generalized Scalar-Tensor theory plus a massive scalar
field in the Bianchi type I model | 10 pages | Class.Quant.Grav. 18 (2001) 2887-2894 | 10.1088/0264-9381/18/15/304 | null | gr-qc | null | In this paper we study the isotropisation of a Generalized Scalar-Tensor
theory with a massive scalar field. We find it depends on a condition on the
Brans-Dicke coupling function and the potential and show that asymptotically
the metric functions always tend toward a power or exponential law of the
proper time. Thes... | [
{
"created": "Fri, 19 Sep 2003 12:15:02 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Fay",
"Stephane",
""
]
] | In this paper we study the isotropisation of a Generalized Scalar-Tensor theory with a massive scalar field. We find it depends on a condition on the Brans-Dicke coupling function and the potential and show that asymptotically the metric functions always tend toward a power or exponential law of the proper time. These ... |
gr-qc/0212019 | Jose Luis Rosales | J.L. Rosales | The Pioneer's acceleration anomaly and Hubble's constant | 8 pages, LaTex, minor changes for submission | null | null | null | gr-qc | null | The reported anomalous acceleration acting on the Pioneers spacecrafts could
be seen as a consequence of the existence of some local curvature in light
geodesics when using the coordinate speed of light in an expanding space-time.
The effect is related with the non synchronous character of the underlying
metric and t... | [
{
"created": "Wed, 4 Dec 2002 17:37:52 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Dec 2002 12:28:32 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Rosales",
"J. L.",
""
]
] | The reported anomalous acceleration acting on the Pioneers spacecrafts could be seen as a consequence of the existence of some local curvature in light geodesics when using the coordinate speed of light in an expanding space-time. The effect is related with the non synchronous character of the underlying metric and the... |
2112.05167 | Adrien Kuntz | Adrien Kuntz | Precession resonances in hierarchical triple systems | Version accepted for publication in PRD | null | 10.1103/PhysRevD.105.024017 | null | gr-qc astro-ph.GA astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a new kind of resonance occuring in relativistic three-body
hierarchical systems: the precession resonance, occuring when the relativistic
precession timescale of a binary equals the period of a distant perturber. We
find that, contrary to what most previous studies assume, it can lead to an
exponential i... | [
{
"created": "Thu, 9 Dec 2021 19:00:04 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jan 2022 17:52:25 GMT",
"version": "v2"
}
] | 2022-01-06 | [
[
"Kuntz",
"Adrien",
""
]
] | We describe a new kind of resonance occuring in relativistic three-body hierarchical systems: the precession resonance, occuring when the relativistic precession timescale of a binary equals the period of a distant perturber. We find that, contrary to what most previous studies assume, it can lead to an exponential inc... |
2008.04289 | Alesandro Santos | P. S. Ens and A. F. Santos | $f(R)$ gravity and Tsallis holographic dark energy | 14 pages, accepted for publication in EPL | null | 10.1209/0295-5075/131/40007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The $f(R)$ gravity theory is considered. It is a gravitational theory that
generalizes the Einstein-Hilbert action. In this context, a holographic dark
energy model is studied. Tsallis non-extensive entropy is used to introduce the
dark energy density based on the holographic principle. Then the Friedmann
equation, d... | [
{
"created": "Mon, 10 Aug 2020 17:40:30 GMT",
"version": "v1"
}
] | 2020-12-02 | [
[
"Ens",
"P. S.",
""
],
[
"Santos",
"A. F.",
""
]
] | The $f(R)$ gravity theory is considered. It is a gravitational theory that generalizes the Einstein-Hilbert action. In this context, a holographic dark energy model is studied. Tsallis non-extensive entropy is used to introduce the dark energy density based on the holographic principle. Then the Friedmann equation, dec... |
1111.6575 | Stephane Houndjo Dr | M. Hamani Daouda, Manuel E. Rodrigues and M. J. S. Houndjo | Reconstruction of f(T) gravity according to holographic dark energy | 11 pages, Accepted for publication in EPJC | Euro. Phys. J. C 72, Number 2, 1893 (2012) | 10.1140/epjc/s10052-012-1893-5 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop the reconstruction of a model of $f(T)$ gravity according to the
holographic dark energy. $T$ is the torsion scalar and its initial value from
the Teleparallel gravity is imposed for fitting the initial value of the
function $f(T)$. The result shows a polynomial function for $f(T)$, and we also
observe tha... | [
{
"created": "Mon, 28 Nov 2011 20:43:32 GMT",
"version": "v1"
},
{
"created": "Sat, 7 Jan 2012 20:07:39 GMT",
"version": "v2"
}
] | 2012-02-16 | [
[
"Daouda",
"M. Hamani",
""
],
[
"Rodrigues",
"Manuel E.",
""
],
[
"Houndjo",
"M. J. S.",
""
]
] | We develop the reconstruction of a model of $f(T)$ gravity according to the holographic dark energy. $T$ is the torsion scalar and its initial value from the Teleparallel gravity is imposed for fitting the initial value of the function $f(T)$. The result shows a polynomial function for $f(T)$, and we also observe that,... |
gr-qc/9702031 | Sergei Krasnikov | S. V. Krasnikov | A singularity-free WEC-respecting time machine | The final version. To be published in CQG. The proof is made more
detailed and a few minor errors are corrected | Class.Quant.Grav. 15 (1998) 997-1003 | 10.1088/0264-9381/15/4/020 | null | gr-qc | null | A time machine (TM) is constructed whose creating in contrast to all TMs
known so far requires neither singularities, nor violation of the weak energy
condition (WEC). The spacetime exterior to the TM closely resembles the
Friedmann universe.
| [
{
"created": "Sun, 16 Feb 1997 23:38:26 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Feb 1997 10:48:20 GMT",
"version": "v2"
},
{
"created": "Mon, 9 Mar 1998 17:10:56 GMT",
"version": "v3"
}
] | 2009-10-30 | [
[
"Krasnikov",
"S. V.",
""
]
] | A time machine (TM) is constructed whose creating in contrast to all TMs known so far requires neither singularities, nor violation of the weak energy condition (WEC). The spacetime exterior to the TM closely resembles the Friedmann universe. |
gr-qc/0610123 | Ernesto F. Eiroa | Cecilia Bejarano, Ernesto F. Eiroa, Claudio Simeone | Thin-shell wormholes associated with global cosmic strings | 7 pages; v2: minor changes. Accepted for publication in Physical
Review D | Phys.Rev.D75:027501,2007 | 10.1103/PhysRevD.75.027501 | null | gr-qc astro-ph | null | In this article we construct cylindrical thin-shell wormholes in the context
of global cosmic strings. We study the stability of static configurations under
perturbations preserving the symmetry and we find that the throat tends to
collapse or expand, depending only on the direction of the velocity
perturbation.
| [
{
"created": "Wed, 25 Oct 2006 19:18:25 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Dec 2006 18:13:09 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bejarano",
"Cecilia",
""
],
[
"Eiroa",
"Ernesto F.",
""
],
[
"Simeone",
"Claudio",
""
]
] | In this article we construct cylindrical thin-shell wormholes in the context of global cosmic strings. We study the stability of static configurations under perturbations preserving the symmetry and we find that the throat tends to collapse or expand, depending only on the direction of the velocity perturbation. |
1109.5612 | F. S. Guzman | F. S. Guzman | Toward restrictions on boson stars as black hole mimickers | Proceedings of the Spanish Relativity Meeting ERE 2010, 4 pages, 2
eps figures | J.Phys.Conf.Ser. 314:012085,2011 | 10.1088/1742-6596/314/1/012085 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The status of boson stars as black hole mimickers is presented. We focus on
the analysis of the emission spectrum of a simple accretion disk model. We
describe the free parameters that allow a boson star to become a black hole
mimicker and present an example of a particular astrophysical case.
| [
{
"created": "Mon, 26 Sep 2011 15:42:00 GMT",
"version": "v1"
}
] | 2011-09-27 | [
[
"Guzman",
"F. S.",
""
]
] | The status of boson stars as black hole mimickers is presented. We focus on the analysis of the emission spectrum of a simple accretion disk model. We describe the free parameters that allow a boson star to become a black hole mimicker and present an example of a particular astrophysical case. |
gr-qc/0305046 | Matteo Luca Ruggiero | Guido Rizzi, Matteo Luca Ruggiero | The Sagnac Phase Shift suggested by the Aharonov-Bohm effect for
relativistic matter beams | 18 pages, LaTeX, 2 EPS figures. To appear in General Relativity and
Gravitation | Gen.Rel.Grav. 35 (2003) 1745-1760 | 10.1023/A:1026053828421 | null | gr-qc | null | The phase shift due to the Sagnac Effect, for relativistic matter beams
counter-propagating in a rotating interferometer, is deduced on the bases of a
a formal analogy with the the Aharonov-Bohm effect. A procedure outlined by
Sakurai, in which non relativistic quantum mechanics and newtonian physics
appear together ... | [
{
"created": "Tue, 13 May 2003 07:23:27 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Rizzi",
"Guido",
""
],
[
"Ruggiero",
"Matteo Luca",
""
]
] | The phase shift due to the Sagnac Effect, for relativistic matter beams counter-propagating in a rotating interferometer, is deduced on the bases of a a formal analogy with the the Aharonov-Bohm effect. A procedure outlined by Sakurai, in which non relativistic quantum mechanics and newtonian physics appear together wi... |
2006.12550 | John W. Moffat | J. W. Moffat | Modified Gravity (MOG), Cosmology and Black Holes | 8 pages, no figures. Changes made to comply with published paper.
Paper accepted for publication by Journal of Cosmology and Astroparticle
Physics. Text corrected to match published paper | JCAP 02:017 (2021) | 10.1088/1475-7516/2021/02/017 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A covariant modified gravity (MOG) is formulated by adding to general
relativity two new degrees of freedom, a scalar field gravitational coupling
strength $G= 1/\chi$ and a gravitational spin 1 vector field $\phi_\mu$. The
$G$ is written as $G=G_N(1+\alpha)$ where $G_N$ is Newton's constant, and the
gravitational so... | [
{
"created": "Mon, 22 Jun 2020 18:23:31 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Jul 2020 19:25:09 GMT",
"version": "v2"
},
{
"created": "Tue, 8 Dec 2020 17:12:56 GMT",
"version": "v3"
},
{
"created": "Wed, 10 Feb 2021 17:45:30 GMT",
"version": "v4"
}
] | 2021-02-17 | [
[
"Moffat",
"J. W.",
""
]
] | A covariant modified gravity (MOG) is formulated by adding to general relativity two new degrees of freedom, a scalar field gravitational coupling strength $G= 1/\chi$ and a gravitational spin 1 vector field $\phi_\mu$. The $G$ is written as $G=G_N(1+\alpha)$ where $G_N$ is Newton's constant, and the gravitational sour... |
gr-qc/0201054 | Marc Mars | Marc Mars, Jose M.M. Senovilla | Geometry of General Hypersurfaces in Spacetime: Junction Conditions | Latex, no figures | Class.Quant.Grav.10:1865-1897,1993 | 10.1088/0264-9381/10/9/026 | null | gr-qc | null | We study imbedded hypersurfaces in spacetime whose causal character is
allowed to change from point to point. Inherited geometrical structures on
these hypersurfaces are defined by two methods: first, the standard rigged
connection induced by a rigging vector (a vector not tangent to the
hypersurface anywhere); and a... | [
{
"created": "Wed, 16 Jan 2002 14:06:38 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Mars",
"Marc",
""
],
[
"Senovilla",
"Jose M. M.",
""
]
] | We study imbedded hypersurfaces in spacetime whose causal character is allowed to change from point to point. Inherited geometrical structures on these hypersurfaces are defined by two methods: first, the standard rigged connection induced by a rigging vector (a vector not tangent to the hypersurface anywhere); and a s... |
gr-qc/9903007 | Siming Liu | L.Hao, J.Wei, S.Liu | Relativistic Spheres | 8 pages revtex, 1 ps figure | null | null | null | gr-qc | null | By analyzing the Einstein's equations for the static sphere, we find that
there exists a non-singular static configuration whose radius can approach its
corresponding horizon size arbitrarily.
| [
{
"created": "Tue, 2 Mar 1999 10:20:13 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hao",
"L.",
""
],
[
"Wei",
"J.",
""
],
[
"Liu",
"S.",
""
]
] | By analyzing the Einstein's equations for the static sphere, we find that there exists a non-singular static configuration whose radius can approach its corresponding horizon size arbitrarily. |
0712.4143 | Karim Noui | Karim Noui, Alejandro Perez, Kevin Vandersloot | Cosmological Plebanski theory | 20 pages | Gen.Rel.Grav.41:2597-2618,2009 | 10.1007/s10714-009-0783-0 | null | gr-qc | null | We consider the cosmological symmetry reduction of the Plebanski action as a
toy-model to explore, in this simple framework, some issues related to loop
quantum gravity and spin-foam models. We make the classical analysis of the
model and perform both path integral and canonical quantizations. As for the
full theory,... | [
{
"created": "Wed, 26 Dec 2007 19:46:30 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Noui",
"Karim",
""
],
[
"Perez",
"Alejandro",
""
],
[
"Vandersloot",
"Kevin",
""
]
] | We consider the cosmological symmetry reduction of the Plebanski action as a toy-model to explore, in this simple framework, some issues related to loop quantum gravity and spin-foam models. We make the classical analysis of the model and perform both path integral and canonical quantizations. As for the full theory, t... |
1407.5114 | Mariam Bouhmadi-Lopez | Mariam Bouhmadi-Lopez, Che-Yu Chen, Pisin Chen | Cosmological singularities in Born-Infeld determinantal gravity | 6 pages, 2 figures, RevTex4-1. A minor change. Version accepted in
PRD | Phys. Rev. D 90, 123518 (2014) | 10.1103/PhysRevD.90.123518 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Born-Infeld determinantal gravity has been recently proposed as a way to
smooth the Big Bang singularity. This theory is formulated on the Weitzenbock
space-time and the teleparallel representation is used instead of the standard
Riemannian representation. We find that although this theory is shown to be
singular... | [
{
"created": "Fri, 18 Jul 2014 20:42:24 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Nov 2014 19:14:07 GMT",
"version": "v2"
}
] | 2014-12-24 | [
[
"Bouhmadi-Lopez",
"Mariam",
""
],
[
"Chen",
"Che-Yu",
""
],
[
"Chen",
"Pisin",
""
]
] | The Born-Infeld determinantal gravity has been recently proposed as a way to smooth the Big Bang singularity. This theory is formulated on the Weitzenbock space-time and the teleparallel representation is used instead of the standard Riemannian representation. We find that although this theory is shown to be singularit... |
gr-qc/0109038 | Patrick Peter | Patrick Peter (IAP) and Nelson Pinto-Neto (CBPF) | Has the Universe always expanded ? | 11 pages, LaTeX-ReVTeX, no figures, submitted to PRD | Phys.Rev. D65 (2002) 023513 | 10.1103/PhysRevD.65.023513 | null | gr-qc | null | We consider a cosmological setting for which the currently expanding era is
preceded by a contracting phase, that is, we assume the Universe experienced at
least one bounce. We show that scalar hydrodynamic perturbations lead to a
singular behavior of the Bardeen potential and/or its derivatives (i.e. the
curvature) ... | [
{
"created": "Tue, 11 Sep 2001 16:35:10 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Peter",
"Patrick",
"",
"IAP"
],
[
"Pinto-Neto",
"Nelson",
"",
"CBPF"
]
] | We consider a cosmological setting for which the currently expanding era is preceded by a contracting phase, that is, we assume the Universe experienced at least one bounce. We show that scalar hydrodynamic perturbations lead to a singular behavior of the Bardeen potential and/or its derivatives (i.e. the curvature) fo... |
0903.2258 | David Reeb | Stephen D. H. Hsu, David Reeb | Black holes, information and decoherence | 7 pages, revtex; v2: added discussion of laboratory decoherence
experiments, minor changes, final version to be published in Phys. Rev. D | Phys.Rev.D79:124037,2009 | 10.1103/PhysRevD.79.124037 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the experimental capabilities required to test whether black
holes destroy information. We show that an experiment capable of illuminating
the information puzzle must necessarily be able to detect or manipulate
macroscopic superpositions (i.e., Everett branches). Hence, it could also
address the fundam... | [
{
"created": "Thu, 12 Mar 2009 20:01:05 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Jun 2009 01:48:21 GMT",
"version": "v2"
}
] | 2009-07-09 | [
[
"Hsu",
"Stephen D. H.",
""
],
[
"Reeb",
"David",
""
]
] | We investigate the experimental capabilities required to test whether black holes destroy information. We show that an experiment capable of illuminating the information puzzle must necessarily be able to detect or manipulate macroscopic superpositions (i.e., Everett branches). Hence, it could also address the fundamen... |
0806.3052 | Eric Poisson | Stephanne Taylor and Eric Poisson | Nonrotating black hole in a post-Newtonian tidal environment | 27 pages, 1 figure | Phys.Rev.D78:084016,2008 | 10.1103/PhysRevD.78.084016 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the motion and tidal dynamics of a nonrotating black hole placed
within a post-Newtonian external spacetime. The tidal perturbation created by
the external environment is treated as a small perturbation. At a large
distance from the black hole, the gravitational field of the external
distribution of matter... | [
{
"created": "Wed, 18 Jun 2008 17:38:42 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Sep 2008 18:35:12 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Taylor",
"Stephanne",
""
],
[
"Poisson",
"Eric",
""
]
] | We examine the motion and tidal dynamics of a nonrotating black hole placed within a post-Newtonian external spacetime. The tidal perturbation created by the external environment is treated as a small perturbation. At a large distance from the black hole, the gravitational field of the external distribution of matter i... |
gr-qc/0406049 | Vladimir Khatsymovsky | V.M. Khatsymovsky | Feynman path integral in area tensor Regge calculus and correspondence
principle | 9 pages, plain LaTeX | Phys.Lett. B601 (2004) 222-228 | 10.1016/j.physletb.2004.09.038 | null | gr-qc | null | The quantum measure in area tensor Regge calculus can be constructed in such
the way that it reduces to the Feynman path integral describing canonical
quantisation if the continuous limit along any of the coordinates is taken.
This construction does not necessarily mean that Lorentzian (Euclidean) measure
satisfies c... | [
{
"created": "Fri, 11 Jun 2004 15:31:08 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Khatsymovsky",
"V. M.",
""
]
] | The quantum measure in area tensor Regge calculus can be constructed in such the way that it reduces to the Feynman path integral describing canonical quantisation if the continuous limit along any of the coordinates is taken. This construction does not necessarily mean that Lorentzian (Euclidean) measure satisfies cor... |
gr-qc/0008003 | Ana Nunes | Ana Nunes (U. Lisbon) and Jose P. Mimoso (U. Lisbon) | On the potentials yielding cosmological scaling solutions | RevTeX, 10 pages, no figures | Phys.Lett. B488 (2000) 423-427 | 10.1016/S0370-2693(00)00919-9 | CFNUL/2000-1 | gr-qc | null | In the present work we perform a phase-plane analysis of the complete
dynamical system corresponding to a flat FRW cosmological models with a perfect
fluid and a self-interacting scalar field and show that every positive and
monotonous potential which is asymptotically exponential yields a scaling
solution as a globa... | [
{
"created": "Tue, 1 Aug 2000 16:39:32 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Aug 2000 20:56:07 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Nunes",
"Ana",
"",
"U. Lisbon"
],
[
"Mimoso",
"Jose P.",
"",
"U. Lisbon"
]
] | In the present work we perform a phase-plane analysis of the complete dynamical system corresponding to a flat FRW cosmological models with a perfect fluid and a self-interacting scalar field and show that every positive and monotonous potential which is asymptotically exponential yields a scaling solution as a global ... |
1712.00135 | Elena Giorgi | Elena Giorgi | Coupled gravitational and electromagnetic perturbations of
Reissner-Nordstr\"om spacetime in a polarized setting | null | null | null | null | gr-qc math.AP math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a system of equations governing the coupled gravitational and
electromagnetic perturbations of Reissner-Nordstr\"om spacetime. The equations
are derived in the context of global non-linear stability of
Reissner-Nordstr\"om under axially symmetric polarized perturbations, as a
generalization of the recent wo... | [
{
"created": "Fri, 1 Dec 2017 00:26:39 GMT",
"version": "v1"
}
] | 2017-12-04 | [
[
"Giorgi",
"Elena",
""
]
] | We derive a system of equations governing the coupled gravitational and electromagnetic perturbations of Reissner-Nordstr\"om spacetime. The equations are derived in the context of global non-linear stability of Reissner-Nordstr\"om under axially symmetric polarized perturbations, as a generalization of the recent work... |
gr-qc/0610055 | Ozgur Delice | Ozgur Delice | Cylindrically symmetric, static strings with a cosmological constant in
Brans-Dicke theory | 8 pages, Revtex; Published version | Phys.Rev.D74:124001,2006 | 10.1103/PhysRevD.74.124001 | null | gr-qc hep-th | null | The static, cylindrically symmetric vacuum solutions with a cosmological
constant in the framework of the Brans-Dicke theory are investigated. Some of
these solutions admitting Lorentz boost invariance along the symmetry axis
correspond to local, straight cosmic strings with a cosmological constant. Some
physical pro... | [
{
"created": "Wed, 11 Oct 2006 13:30:52 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Oct 2006 12:50:59 GMT",
"version": "v2"
},
{
"created": "Tue, 5 Dec 2006 01:55:19 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Delice",
"Ozgur",
""
]
] | The static, cylindrically symmetric vacuum solutions with a cosmological constant in the framework of the Brans-Dicke theory are investigated. Some of these solutions admitting Lorentz boost invariance along the symmetry axis correspond to local, straight cosmic strings with a cosmological constant. Some physical prope... |
1206.5517 | Frigyes Nemes Mr. | F. Nemes, B. Mik\'oczi | Perturbed Kepler-problem in general relativity with quaternions | 22 pages, 4 figures | Int. J. Mod. Phys. D 22, 1350040 (2013) | 10.1142/S0218271813500405 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The motion of binary star systems is re-examined in the presence of
perturbations from the theory of general relativity. The Kepler problem is
regularized and linearized with quaternions. In this way first order
perturbation results are derived.
| [
{
"created": "Sun, 24 Jun 2012 16:19:33 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Jul 2012 13:23:06 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Oct 2012 09:11:44 GMT",
"version": "v3"
}
] | 2013-07-09 | [
[
"Nemes",
"F.",
""
],
[
"Mikóczi",
"B.",
""
]
] | The motion of binary star systems is re-examined in the presence of perturbations from the theory of general relativity. The Kepler problem is regularized and linearized with quaternions. In this way first order perturbation results are derived. |
gr-qc/9410032 | Kawai | Toshiharu Kawai | Exotic black hole solution in teleparallel theory of (2+1)-dimensional
gravity | 11, ReVTeX | Prog.Theor.Phys. 94 (1995) 1169-1174 | 10.1143/PTP.94.1169 | null | gr-qc | null | A black hole solution in a teleparallel theory of (2+1)-dimensional gravity,
given in a previous paper, is examined. This solution is also a solution of the
three-dimensional vacuum Einstein equation with a vanishing cosmological
constant. Remarkable is the fact that this solution gives a black hole in a \lq
\lq flat... | [
{
"created": "Mon, 24 Oct 1994 10:00:15 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Kawai",
"Toshiharu",
""
]
] | A black hole solution in a teleparallel theory of (2+1)-dimensional gravity, given in a previous paper, is examined. This solution is also a solution of the three-dimensional vacuum Einstein equation with a vanishing cosmological constant. Remarkable is the fact that this solution gives a black hole in a \lq \lq flat-l... |
2305.01268 | Xiangyun Fu fu | Min Wang, Xiangyun Fu, Bing Xu, Ying Yang, and Zhaoxia Chen | Testing the FLRW metric with the Hubble and transversal BAO measurements | Accepted by PRD | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The cosmological principle is one of the fundamental assumptions of the
standard model of Cosmology (SCM), and it allow us to describe cosmic distances
and clocks by using the Friedmann-Lema$\rm{\hat{{\i}}}$tre-Roberton-Walker
(FLRW) metric. Thus, it is essential to test the FLRW metric with cosmological
observations... | [
{
"created": "Tue, 2 May 2023 09:05:14 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Oct 2023 07:25:06 GMT",
"version": "v2"
}
] | 2023-10-30 | [
[
"Wang",
"Min",
""
],
[
"Fu",
"Xiangyun",
""
],
[
"Xu",
"Bing",
""
],
[
"Yang",
"Ying",
""
],
[
"Chen",
"Zhaoxia",
""
]
] | The cosmological principle is one of the fundamental assumptions of the standard model of Cosmology (SCM), and it allow us to describe cosmic distances and clocks by using the Friedmann-Lema$\rm{\hat{{\i}}}$tre-Roberton-Walker (FLRW) metric. Thus, it is essential to test the FLRW metric with cosmological observations t... |
1501.06282 | Chopin Soo | Eyo Eyo Ita III, Chopin Soo, Hoi-Lai Yu | Intrinsic Time Quantum Geometrodynamics | 6 pages | Prog. Theor. Exp. Phys. (2015) 083E01 | 10.1093/ptep/ptv109 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum Geometrodynamics with intrinsic time development and momentric
variables is presented. An underlying SU(3) group structure at each spatial
point regulates the theory. The intrinsic time behavior of the theory is
analyzed, together with its ground state and primordial quantum fluctuations.
Cotton-York potentia... | [
{
"created": "Mon, 26 Jan 2015 08:25:30 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Feb 2015 15:46:49 GMT",
"version": "v2"
}
] | 2015-08-12 | [
[
"Ita",
"Eyo Eyo",
"III"
],
[
"Soo",
"Chopin",
""
],
[
"Yu",
"Hoi-Lai",
""
]
] | Quantum Geometrodynamics with intrinsic time development and momentric variables is presented. An underlying SU(3) group structure at each spatial point regulates the theory. The intrinsic time behavior of the theory is analyzed, together with its ground state and primordial quantum fluctuations. Cotton-York potential ... |
0804.2502 | Jos\'e Wadih Maluf Dr. | J. W. Maluf and F. F. Faria | On the construction of Fermi-Walker transported frames | 16 pages, no figures | AnnalenPhys.17:326-335,2008 | 10.1002/andp.200810289 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider tetrad fields as reference frames adapted to observers that move
along arbitrary timelike trajectories in spacetime. By means of a local Lorentz
transformation we can transform these frames into Fermi-Walker transported
frames, which define a standard of non-rotation for accelerated observers. Here
we pre... | [
{
"created": "Tue, 15 Apr 2008 23:40:40 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Maluf",
"J. W.",
""
],
[
"Faria",
"F. F.",
""
]
] | We consider tetrad fields as reference frames adapted to observers that move along arbitrary timelike trajectories in spacetime. By means of a local Lorentz transformation we can transform these frames into Fermi-Walker transported frames, which define a standard of non-rotation for accelerated observers. Here we prese... |
2307.16534 | Kamal Hajian | Kamal Hajian | Single-rotating Five-dimensional Near-horizon Extremal Geometry in
General Relativity | 10 pages, published version | Phys.Rev.D 109 (2024) 4, 044040 | 10.1103/PhysRevD.109.044040 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | The geometries with SL$(2,\mathbb{R})$ and some axial U$(1)$ isometries are
called ``near-horizon extremal geometries" and are found usually, but not
necessarily, in the near-horizon limit of the extremal black holes. We present
a new member of this family of solutions in five-dimensional Einstein-Hilbert
gravity tha... | [
{
"created": "Mon, 31 Jul 2023 10:00:25 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Feb 2024 08:39:27 GMT",
"version": "v2"
}
] | 2024-02-22 | [
[
"Hajian",
"Kamal",
""
]
] | The geometries with SL$(2,\mathbb{R})$ and some axial U$(1)$ isometries are called ``near-horizon extremal geometries" and are found usually, but not necessarily, in the near-horizon limit of the extremal black holes. We present a new member of this family of solutions in five-dimensional Einstein-Hilbert gravity that ... |
2307.09079 | Tao Wang | Zhi-Shuo Qu, Towe Wang, Chao-Jun Feng | Reduced Kiselev black hole | 8 pages, 5 figures, references added | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Kiselev model describes a black hole surrounded by a fluid with equations
of state $p_r/\rho=-1$ and $p_t/\rho=(3w+1)/2$ respectively in radial and
tangential directions. It has been extensively studied in the parameter region
$-1<w<-1/3$. If one rids off the black hole and turns to the region $-1/3<w<0$,
i.e. $p... | [
{
"created": "Tue, 18 Jul 2023 08:56:37 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Dec 2023 13:01:46 GMT",
"version": "v2"
}
] | 2023-12-27 | [
[
"Qu",
"Zhi-Shuo",
""
],
[
"Wang",
"Towe",
""
],
[
"Feng",
"Chao-Jun",
""
]
] | The Kiselev model describes a black hole surrounded by a fluid with equations of state $p_r/\rho=-1$ and $p_t/\rho=(3w+1)/2$ respectively in radial and tangential directions. It has been extensively studied in the parameter region $-1<w<-1/3$. If one rids off the black hole and turns to the region $-1/3<w<0$, i.e. $p_t... |
1405.2832 | Roberto Chan | R. Chan, M. F. A. da Silva, C. F. C. Brandt | Gravitational Collapse of an Imperfect Non Adiabatic Fluid | 25 pages, 16 figures, published in IJMPD | International Journal of Modern Physics D Vol. 23, No. 6 (2014)
1450056 | 10.1142/S0218271814500564 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the evolution of an anisotropic shear-free fluid with heat flux and
kinematic self-similarity of the second kind. We found a class of solution to
the Einstein field equations by assuming that the part of the tangential
pressure which is explicitly time dependent of the fluid is zero and that the
fluid moves ... | [
{
"created": "Mon, 12 May 2014 16:51:31 GMT",
"version": "v1"
}
] | 2014-05-13 | [
[
"Chan",
"R.",
""
],
[
"da Silva",
"M. F. A.",
""
],
[
"Brandt",
"C. F. C.",
""
]
] | We study the evolution of an anisotropic shear-free fluid with heat flux and kinematic self-similarity of the second kind. We found a class of solution to the Einstein field equations by assuming that the part of the tangential pressure which is explicitly time dependent of the fluid is zero and that the fluid moves al... |
2102.06951 | Pardyumn Kumar Sahoo | Avik De, Tee-How Loo, Simran Arora and P.K. Sahoo | Energy conditions for a $(WRS)_4$ spacetime in $F(R)$-gravity | EPJP published version | Eur. Phys. J. Plus, 136(2) (2021) 218 | 10.1140/epjp/s13360-021-01216-2 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The objective of the present paper is to study 4-dimensional weakly Ricci
symmetric spacetimes $(WRS)_4$ with non-zero constant Ricci scalar. We prove
that such a $(WRS)_4$ satisfying $F(R)$-gravity field equations represents a
perfect fluid with vanishing vorticity. Some energy conditions are studied
under the curre... | [
{
"created": "Sat, 13 Feb 2021 16:02:33 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Mar 2021 05:25:59 GMT",
"version": "v2"
}
] | 2021-03-30 | [
[
"De",
"Avik",
""
],
[
"Loo",
"Tee-How",
""
],
[
"Arora",
"Simran",
""
],
[
"Sahoo",
"P. K.",
""
]
] | The objective of the present paper is to study 4-dimensional weakly Ricci symmetric spacetimes $(WRS)_4$ with non-zero constant Ricci scalar. We prove that such a $(WRS)_4$ satisfying $F(R)$-gravity field equations represents a perfect fluid with vanishing vorticity. Some energy conditions are studied under the current... |
1809.01078 | Dr. Sudhaker Upadhyay | Sudhaker Upadhyay, Seyed Hossein Hendi, Shahram Panahiyan and Behzad
Eslam Panah | Thermal fluctuations of charged black holes in gravity's rainbow | 19 pages, 16 captioned figures, accepted for publication in PTEP | Prog. Theor. Exp. Phys. 2018, 093E01 | 10.1093/ptep/pty093 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum fluctuation effects have an irrefutable role in high energy physics.
Such fluctuation can be often regarded as a correction of infrared (IR) limit.
In this paper, the effects of the first-order correction of entropy, caused by
thermal fluctuation, on the thermodynamics of charged black holes in gravity's
rain... | [
{
"created": "Tue, 4 Sep 2018 16:36:23 GMT",
"version": "v1"
}
] | 2018-10-02 | [
[
"Upadhyay",
"Sudhaker",
""
],
[
"Hendi",
"Seyed Hossein",
""
],
[
"Panahiyan",
"Shahram",
""
],
[
"Panah",
"Behzad Eslam",
""
]
] | Quantum fluctuation effects have an irrefutable role in high energy physics. Such fluctuation can be often regarded as a correction of infrared (IR) limit. In this paper, the effects of the first-order correction of entropy, caused by thermal fluctuation, on the thermodynamics of charged black holes in gravity's rainbo... |
0912.3125 | Doreen M\"uller | Doreen Mueller, Bernd Bruegmann | Toward a dynamical shift condition for unequal mass black hole binary
simulations | 15 pages, submitted to CQG for NRDA 2009 conference proceedings | Class.Quant.Grav.27:114008,2010 | 10.1088/0264-9381/27/11/114008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Moving puncture simulations of black hole binaries rely on a specific gauge
choice that leads to approximately stationary coordinates near each black hole.
Part of the shift condition is a damping parameter, which has to be properly
chosen for stable evolutions. However, a constant damping parameter does not
account ... | [
{
"created": "Wed, 16 Dec 2009 12:51:09 GMT",
"version": "v1"
}
] | 2010-05-25 | [
[
"Mueller",
"Doreen",
""
],
[
"Bruegmann",
"Bernd",
""
]
] | Moving puncture simulations of black hole binaries rely on a specific gauge choice that leads to approximately stationary coordinates near each black hole. Part of the shift condition is a damping parameter, which has to be properly chosen for stable evolutions. However, a constant damping parameter does not account fo... |
1211.7183 | Luigi Ferraioli | Luigi Ferraioli, Edward K. Porter, Eric Plagnol | Bayesian Inference for LISA Pathfinder using Markov Chain Monte Carlo
Methods | null | null | null | null | gr-qc astro-ph.IM physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a parameter estimation procedure based on a Bayesian framework by
applying a Markov Chain Monte Carlo algorithm to the calibration of the
dynamical parameters of a space based gravitational wave detector. The method
is based on the Metropolis-Hastings algorithm and a two-stage annealing
treatment in order ... | [
{
"created": "Fri, 30 Nov 2012 08:40:08 GMT",
"version": "v1"
}
] | 2012-12-03 | [
[
"Ferraioli",
"Luigi",
""
],
[
"Porter",
"Edward K.",
""
],
[
"Plagnol",
"Eric",
""
]
] | We present a parameter estimation procedure based on a Bayesian framework by applying a Markov Chain Monte Carlo algorithm to the calibration of the dynamical parameters of a space based gravitational wave detector. The method is based on the Metropolis-Hastings algorithm and a two-stage annealing treatment in order to... |
2112.08032 | Djeyrane-Sophie Erfani | Djeyrane-Sophie Erfani, Hossein Shojaie | Study of the de Sitter space-time and its behavior at infinity | null | null | null | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | The aim of this manuscript is to review the studies about de Sitter solution
and the null infinity of asymptotically flat and de Sitter space-times. Thus,
after introducing the de Sitter space-time, the symmetry group is described.
Also precise definitions of asymptotically flat and de Sitter space-times are
reviewed... | [
{
"created": "Wed, 15 Dec 2021 10:51:50 GMT",
"version": "v1"
}
] | 2021-12-16 | [
[
"Erfani",
"Djeyrane-Sophie",
""
],
[
"Shojaie",
"Hossein",
""
]
] | The aim of this manuscript is to review the studies about de Sitter solution and the null infinity of asymptotically flat and de Sitter space-times. Thus, after introducing the de Sitter space-time, the symmetry group is described. Also precise definitions of asymptotically flat and de Sitter space-times are reviewed. ... |
gr-qc/0005062 | Alicia M. Sintes | A.M. Sintes, B.F. Schutz | Removal of interference from external coherent signals | Latex, 6 pages, 3 figures. Published in "Laser Interferometer Space
Antenna: Second international LISA symposium on gravitational waves". Edt. W.
Folkner; American Institute of Physics, pp. 135-140 (1998) | null | null | null | gr-qc | null | We present a technique that we call coherent line removal, for removing
external coherent interference from gravitational wave interferometer data. We
illustrate the usefulness of this technique applying it to the the data
produced by the Glasgow laser interferometer in 1996 and removing all those
lines corresponding... | [
{
"created": "Tue, 16 May 2000 13:24:25 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sintes",
"A. M.",
""
],
[
"Schutz",
"B. F.",
""
]
] | We present a technique that we call coherent line removal, for removing external coherent interference from gravitational wave interferometer data. We illustrate the usefulness of this technique applying it to the the data produced by the Glasgow laser interferometer in 1996 and removing all those lines corresponding t... |
1909.03034 | Vicente Antunes | Vicente Antunes, Ignacio Bediaga, Mario Novello | Gravitational baryogenesis without CPT violation | 17 pages, minor corrections and some explanatory remarks to comply
with the referee report are included | JCAP 10 (2019) 076 | 10.1088/1475-7516/2019/10/076 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that in theories with nonminimal curvature-matter couplings up to
first order in the curvature, baryon number (B) conservation and CP are
automatically violated, provided that the curvature scalar and its gradient do
not vanish. Together with the associated gravitationally induced particle
creation in a cosmo... | [
{
"created": "Fri, 6 Sep 2019 17:40:12 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Sep 2019 17:55:07 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Oct 2019 03:21:45 GMT",
"version": "v3"
},
{
"created": "Sun, 3 Nov 2019 23:04:21 GMT",
"version": "v4"
}
] | 2019-11-13 | [
[
"Antunes",
"Vicente",
""
],
[
"Bediaga",
"Ignacio",
""
],
[
"Novello",
"Mario",
""
]
] | We show that in theories with nonminimal curvature-matter couplings up to first order in the curvature, baryon number (B) conservation and CP are automatically violated, provided that the curvature scalar and its gradient do not vanish. Together with the associated gravitationally induced particle creation in a cosmolo... |
1603.09693 | Peter Zimmerman | Samuel E. Gralla and Peter Zimmerman | Plasma Waves and Jets from Moving Conductors | 10 pages. v2 improvements | Phys. Rev. D 93, 123016 (2016) | 10.1103/PhysRevD.93.123016 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider force-free plasma waves launched by the motion of conducting
material through a magnetic field. We develop a spacetime-covariant formalism
for perturbations of a uniform magnetic field and show how the transverse
motion of a conducting fluid acts as a source. We show that fast-mode waves are
sourced by th... | [
{
"created": "Thu, 31 Mar 2016 17:28:53 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Jun 2016 23:24:13 GMT",
"version": "v2"
}
] | 2016-06-29 | [
[
"Gralla",
"Samuel E.",
""
],
[
"Zimmerman",
"Peter",
""
]
] | We consider force-free plasma waves launched by the motion of conducting material through a magnetic field. We develop a spacetime-covariant formalism for perturbations of a uniform magnetic field and show how the transverse motion of a conducting fluid acts as a source. We show that fast-mode waves are sourced by the ... |
1911.02030 | T. Padmanabhan | T. Padmanabhan | Geodesic distance: A descriptor of geometry and correlator of
pre-geometric density of spacetime events | ver 3: 18 pages; Appendix with details of the calculations added | null | 10.1142/S0217732320300086 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Classical geometry can be described either in terms of a metric tensor
$g_{ab}(x)$ or in terms of the geodesic distance $\sigma^2(x,x')$. Recent work,
however, has shown that the geodesic distance is better suited to describe the
quantum structure of spacetime. This is because one can incorporate some of the
key quan... | [
{
"created": "Tue, 5 Nov 2019 19:00:03 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Feb 2020 08:34:20 GMT",
"version": "v2"
},
{
"created": "Fri, 13 Mar 2020 07:33:57 GMT",
"version": "v3"
}
] | 2020-05-20 | [
[
"Padmanabhan",
"T.",
""
]
] | Classical geometry can be described either in terms of a metric tensor $g_{ab}(x)$ or in terms of the geodesic distance $\sigma^2(x,x')$. Recent work, however, has shown that the geodesic distance is better suited to describe the quantum structure of spacetime. This is because one can incorporate some of the key quantu... |
1101.4375 | Maciej Dunajski | Stephen Casey, Maciej Dunajski, Gary Gibbons, Claude Warnick | Optical Metrics and Projective Equivalence | 18 pages, two figures, final version, to appear in Physical Review D | Phys.Rev.D83:084047,2011 | 10.1103/PhysRevD.83.084047 | DAMTP-2011-23 | gr-qc hep-th math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Trajectories of light rays in a static spacetime are described by
unparametrised geodesics of the Riemannian optical metric associated with the
Lorentzian spacetime metric. We investigate the uniqueness of this structure
and demonstrate that two different observers, moving relative to one another,
who both see the un... | [
{
"created": "Sun, 23 Jan 2011 14:06:52 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Mar 2011 21:20:42 GMT",
"version": "v2"
}
] | 2011-05-12 | [
[
"Casey",
"Stephen",
""
],
[
"Dunajski",
"Maciej",
""
],
[
"Gibbons",
"Gary",
""
],
[
"Warnick",
"Claude",
""
]
] | Trajectories of light rays in a static spacetime are described by unparametrised geodesics of the Riemannian optical metric associated with the Lorentzian spacetime metric. We investigate the uniqueness of this structure and demonstrate that two different observers, moving relative to one another, who both see the univ... |
gr-qc/0106009 | Beverly K. Berger | Beverly K. Berger | Approach to the Singularity in Spatially Inhomogeneous Cosmologies | 17 pages, in Differential Equations and Mathematical Physics :
Proceedings of an International Conference Held at the University of Alabama
in Birmingham, ed. by R. Weikard, G. Weinstein (American Mathematical
Society, 2000) | null | null | null | gr-qc | null | A combination of analytic and numerical methods has yielded a clear
understanding of the approach to the singularity in spatially inhomogeneous
cosmologies. Strong support is found for the longstanding claim by Belinskii,
Khalatnikov, and Lifshitz that the collapse is dominated by local Kasner or
Mixmaster behavior. ... | [
{
"created": "Mon, 4 Jun 2001 17:42:45 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Berger",
"Beverly K.",
""
]
] | A combination of analytic and numerical methods has yielded a clear understanding of the approach to the singularity in spatially inhomogeneous cosmologies. Strong support is found for the longstanding claim by Belinskii, Khalatnikov, and Lifshitz that the collapse is dominated by local Kasner or Mixmaster behavior. Th... |
2006.06006 | Jose Luis Bl\'azquez-Salcedo | Jose Luis Bl\'azquez-Salcedo, Daniela D. Doneva, Sarah Kahlen, Jutta
Kunz, Petya Nedkova and Stoytcho S. Yazadjiev | Polar quasinormal modes of the scalarized Einstein-Gauss-Bonnet black
holes | 25 pages, 10 figures | Phys. Rev. D 102, 024086 (2020) | 10.1103/PhysRevD.102.024086 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the polar quasinormal modes of spontaneously scalarized black holes
in Einstein-Gauss-Bonnet theory. In previous works we showed that a set of
nodeless solutions of the fundamental branch of the model studied in [1] are
stable under both radial [2] and axial perturbations [3]. Here we calculate the
polar qua... | [
{
"created": "Wed, 10 Jun 2020 18:00:14 GMT",
"version": "v1"
}
] | 2020-08-05 | [
[
"Blázquez-Salcedo",
"Jose Luis",
""
],
[
"Doneva",
"Daniela D.",
""
],
[
"Kahlen",
"Sarah",
""
],
[
"Kunz",
"Jutta",
""
],
[
"Nedkova",
"Petya",
""
],
[
"Yazadjiev",
"Stoytcho S.",
""
]
] | We study the polar quasinormal modes of spontaneously scalarized black holes in Einstein-Gauss-Bonnet theory. In previous works we showed that a set of nodeless solutions of the fundamental branch of the model studied in [1] are stable under both radial [2] and axial perturbations [3]. Here we calculate the polar quasi... |
1705.01461 | \.I \c{C}a\u{g}r{\i} \.I\c{s}eri | Levent Akant, Birses Debir, \.I. \c{C}a\u{g}r{\i} \.I\c{s}eri | Non-relativistic Limit of Thermodynamics of Bose Field in a Static
Space-time and Bose-Einstein Condensation | Typos corrected | null | 10.1088/1361-6382/aaa0a7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the grand canonical thermodynamics of a noninteracting scalar
field in a static spacetime. We take the nonrelativistic limit of thermodynamic
quantities in a way that leaves the curved structure of the background geometry
intact. Using Mellin transform and heat kernel techniques we obtain asymptotic
expan... | [
{
"created": "Tue, 2 May 2017 10:20:03 GMT",
"version": "v1"
},
{
"created": "Mon, 22 May 2017 09:52:32 GMT",
"version": "v2"
},
{
"created": "Fri, 11 Aug 2017 14:58:47 GMT",
"version": "v3"
},
{
"created": "Tue, 22 May 2018 22:15:19 GMT",
"version": "v4"
}
] | 2018-05-24 | [
[
"Akant",
"Levent",
""
],
[
"Debir",
"Birses",
""
],
[
"İşeri",
"İ. Çağrı",
""
]
] | We consider the grand canonical thermodynamics of a noninteracting scalar field in a static spacetime. We take the nonrelativistic limit of thermodynamic quantities in a way that leaves the curved structure of the background geometry intact. Using Mellin transform and heat kernel techniques we obtain asymptotic expansi... |
1006.0811 | Zuyao Sun | Zu-Yao Sun, Chun-Xiao Yue, You-Gen Shen, Chang-Bo Sun | Dynamics of phantom model with O(N) symmetry in loop quantum cosmology | 9 pages, 3 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Many astrophysical data show that the expansion of our universe is
accelerating. In this paper, we study the model of phantom with O(N) symmetry
in background of loop quantum cosmology(LQC). We investigate the phase-space
stability of the corresponding autonomous system and find no stable node but
only 2 saddle point... | [
{
"created": "Fri, 4 Jun 2010 08:44:36 GMT",
"version": "v1"
}
] | 2010-06-07 | [
[
"Sun",
"Zu-Yao",
""
],
[
"Yue",
"Chun-Xiao",
""
],
[
"Shen",
"You-Gen",
""
],
[
"Sun",
"Chang-Bo",
""
]
] | Many astrophysical data show that the expansion of our universe is accelerating. In this paper, we study the model of phantom with O(N) symmetry in background of loop quantum cosmology(LQC). We investigate the phase-space stability of the corresponding autonomous system and find no stable node but only 2 saddle points ... |
gr-qc/9605044 | Herbert Liebl | H. Liebl (Vienna, Tech. U.), D.V. Vassilevich and S. Alexandrov (St.
Petersburg University) | Hawking radiation and masses in generalized dilaton theories | 24 pages, 3 Postscript figures | Class.Quant.Grav. 14 (1997) 889-904 | 10.1088/0264-9381/14/4/007 | TUW-96-08 | gr-qc hep-th | null | A generalized dilaton action is considered of which the standard dilaton
black hole and spherically reduced gravity are particular cases. The
Arnowitt-Deser-Misner (ADM) and the Bondi-Sachs (BS) mass are calculated.
Special attention is paid to both the asymptotic conditions for the metric as
well as for the referenc... | [
{
"created": "Mon, 20 May 1996 17:16:00 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Liebl",
"H.",
"",
"Vienna, Tech. U."
],
[
"Vassilevich",
"D. V.",
"",
"St.\n Petersburg University"
],
[
"Alexandrov",
"S.",
"",
"St.\n Petersburg University"
]
] | A generalized dilaton action is considered of which the standard dilaton black hole and spherically reduced gravity are particular cases. The Arnowitt-Deser-Misner (ADM) and the Bondi-Sachs (BS) mass are calculated. Special attention is paid to both the asymptotic conditions for the metric as well as for the reference ... |
gr-qc/9706019 | Neven | Neven Bilic (Rudjer Boskovic Institute Zagreb), Raoul Viollier
(university of Cape Town) | Free Energy of Gravitating Fermions | 7 pages, LaTex | null | null | null | gr-qc | null | We study a system of self-gravitating massive fermions in the framework of
the general-relativistic Thomas-Fermi model. We postulate the free energy
functional and show that its extremization is equivalent to solving the
Einstein's field equations. A self-gravitating fermion gas we then describe by
a set of Thomas-Fe... | [
{
"created": "Mon, 9 Jun 1997 14:28:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bilic",
"Neven",
"",
"Rudjer Boskovic Institute Zagreb"
],
[
"Viollier",
"Raoul",
"",
"university of Cape Town"
]
] | We study a system of self-gravitating massive fermions in the framework of the general-relativistic Thomas-Fermi model. We postulate the free energy functional and show that its extremization is equivalent to solving the Einstein's field equations. A self-gravitating fermion gas we then describe by a set of Thomas-Ferm... |
1305.4231 | Lorenzo Sebastiani | L. Sebastiani, D. Momeni, R. Myrzakulov and S.D. Odintsov | The instabilities and (anti)-evaporation of Schwarzschild-de Sitter
black holes in modified gravity | 23 pages, 10 figures, last version, accepted for publication in PRD | Physical Review D, V.88, N10, 104022 (2013) [17 pages] | 10.1103/PhysRevD.88.104022 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the future evolution of Nariai black hole which is extremal
limit of Schwarzschild-de Sitter one in modified gravity. The perturbations
equations around Nariai black hole are derived in static and cosmological
patches for general $F(R)$-gravity. The analytical and numerical study of
several realistic $... | [
{
"created": "Sat, 18 May 2013 06:03:12 GMT",
"version": "v1"
},
{
"created": "Sat, 2 Nov 2013 08:43:21 GMT",
"version": "v2"
}
] | 2013-12-30 | [
[
"Sebastiani",
"L.",
""
],
[
"Momeni",
"D.",
""
],
[
"Myrzakulov",
"R.",
""
],
[
"Odintsov",
"S. D.",
""
]
] | We investigate the future evolution of Nariai black hole which is extremal limit of Schwarzschild-de Sitter one in modified gravity. The perturbations equations around Nariai black hole are derived in static and cosmological patches for general $F(R)$-gravity. The analytical and numerical study of several realistic $F(... |
gr-qc/9405044 | Ian Moss | Ian G. Moss and Stephen J. Poletti | Conformal anomalies on Einstein spaces with Boundary | 8 pages, NCL94-TP10, (ReVTeX) | Phys.Lett. B333 (1994) 326-330 | 10.1016/0370-2693(94)90150-3 | null | gr-qc hep-th | null | The anomalous rescaling for antisymmetric tensor fields, including gauge
bosons, and Dirac fermions on Einstein spaces with boundary has been prone to
errors and these are corrected here. The explicit calculations lead to some
interesting identities that indicate a deeper underlying structure.
| [
{
"created": "Sat, 21 May 1994 09:59:29 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Moss",
"Ian G.",
""
],
[
"Poletti",
"Stephen J.",
""
]
] | The anomalous rescaling for antisymmetric tensor fields, including gauge bosons, and Dirac fermions on Einstein spaces with boundary has been prone to errors and these are corrected here. The explicit calculations lead to some interesting identities that indicate a deeper underlying structure. |
1503.03407 | Ivan Agullo | Ivan Agullo and Abhay Ashtekar | Unitarity and ultraviolet regularity in cosmology | 30 pages, 0 figures. Version to be published in PRD | Phys. Rev. D91, 124010 (2015) | 10.1103/PhysRevD.91.124010 | LSU-REL-031115 | gr-qc hep-th math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum field theory in curved space-times is a well developed area in
mathematical physics which has had important phenomenological applications to
the very early universe. However, it is not commonly appreciated that on time
dependent space-times ---including the simplest cosmological models--- dynamics
of quantum ... | [
{
"created": "Wed, 11 Mar 2015 16:30:54 GMT",
"version": "v1"
},
{
"created": "Wed, 13 May 2015 14:23:01 GMT",
"version": "v2"
}
] | 2015-07-27 | [
[
"Agullo",
"Ivan",
""
],
[
"Ashtekar",
"Abhay",
""
]
] | Quantum field theory in curved space-times is a well developed area in mathematical physics which has had important phenomenological applications to the very early universe. However, it is not commonly appreciated that on time dependent space-times ---including the simplest cosmological models--- dynamics of quantum fi... |
gr-qc/9810085 | Jose Luis Rosales | Jose-Luis Rosales and Jose-Luis Sanchez-Gomez | The "Pioneer effect" as a manifestation of the cosmic expansion in the
solar system | null | null | null | null | gr-qc | null | It is proposed that the recently reported anomalous acceleration acting on
the Pioneers spacecrafts should be a consequence of the existence of some local
curvature in light geodesics when using the coordinate speed of light in an
expanding spacetime. This suggests taht this "Pioneer effect" is nothing else
but the d... | [
{
"created": "Wed, 28 Oct 1998 12:36:27 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Oct 1998 17:58:44 GMT",
"version": "v2"
},
{
"created": "Mon, 24 May 1999 17:57:16 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Rosales",
"Jose-Luis",
""
],
[
"Sanchez-Gomez",
"Jose-Luis",
""
]
] | It is proposed that the recently reported anomalous acceleration acting on the Pioneers spacecrafts should be a consequence of the existence of some local curvature in light geodesics when using the coordinate speed of light in an expanding spacetime. This suggests taht this "Pioneer effect" is nothing else but the det... |
1903.07898 | Albino Perego Dr | Albino Perego, Sebastiano Bernuzzi and David Radice | Thermodynamics conditions of matter in neutron star mergers | 23 pages, 10 Figures, to be submitted to EPJA Topical Issue: The
first Neutron Star Merger Observation - Implications for Nuclear Physics.
Movies of the thermodynamical conditions available also on the youtube
channel https://www.youtube.com/channel/UChmn-JGNa9mfY5H5938jnig | null | 10.1140/epja/i2019-12810-7 | null | gr-qc astro-ph.HE nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Matter in neutron star collisions can reach densities up to few times the
nuclear saturation threshold and temperatures up to one hundred MeV.
Understanding the structure and composition of such matter requires many-body
nonperturbative calculations that are currently highly uncertain.Unique
constraints on the neutro... | [
{
"created": "Tue, 19 Mar 2019 09:24:25 GMT",
"version": "v1"
}
] | 2019-09-04 | [
[
"Perego",
"Albino",
""
],
[
"Bernuzzi",
"Sebastiano",
""
],
[
"Radice",
"David",
""
]
] | Matter in neutron star collisions can reach densities up to few times the nuclear saturation threshold and temperatures up to one hundred MeV. Understanding the structure and composition of such matter requires many-body nonperturbative calculations that are currently highly uncertain.Unique constraints on the neutron ... |
gr-qc/0303057 | Luciano Rezzolla | Luciano Rezzolla | Linear and Nonlinear Dynamics of Relativistic Tori | Invited Talk at the 15th SIGRAV Conference, Frascati Sept. 2002; IOP
Conference Series, one reference added | null | null | null | gr-qc astro-ph | null | I present results of two-dimensional general relativistic hydrodynamical
simulations of constant specific angular momentum tori orbiting around a
Schwarzschild black hole. After introducing axisymmetric perturbations, these
objects either become unstable to the runaway instability or respond with
regular oscillations... | [
{
"created": "Fri, 14 Mar 2003 18:41:08 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Mar 2003 12:02:09 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Rezzolla",
"Luciano",
""
]
] | I present results of two-dimensional general relativistic hydrodynamical simulations of constant specific angular momentum tori orbiting around a Schwarzschild black hole. After introducing axisymmetric perturbations, these objects either become unstable to the runaway instability or respond with regular oscillations. ... |
gr-qc/0003044 | Abeesham | A. Beesham and S. G. Ghosh | Naked Singularities in the Charged Vaidya-deSitter Spacetime | 8 pages, latex, no figures | Int.J.Mod.Phys. D12 (2003) 801-810 | 10.1142/S0218271803003220 | null | gr-qc | null | We study the occurrence of naked singularities in the spherically symmetric
collapse of a charged null fluid in an expanding deSitter background - a piece
of charged Vaidya-deSitter spacetime. The necessary conditions for the
formation of a naked singularity are found. The results for the uncharged
solutions can be r... | [
{
"created": "Fri, 10 Mar 2000 08:05:35 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Beesham",
"A.",
""
],
[
"Ghosh",
"S. G.",
""
]
] | We study the occurrence of naked singularities in the spherically symmetric collapse of a charged null fluid in an expanding deSitter background - a piece of charged Vaidya-deSitter spacetime. The necessary conditions for the formation of a naked singularity are found. The results for the uncharged solutions can be rec... |
1007.3189 | Nigel Bishop | P.J. van der Walt and N.T. Bishop | Observational cosmology using characteristic numerical relativity | null | Phys.Rev.D82:084001,2010 | 10.1103/PhysRevD.82.084001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The characteristic formalism in numerical relativity, which has been
developed to study gravitational waves, and the observer metric approach in
observational cosmology both make use of coordinate systems based on null
cones. In this paper, these coordinate systems are compared and it is then
demonstrated how charact... | [
{
"created": "Mon, 19 Jul 2010 15:45:56 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"van der Walt",
"P. J.",
""
],
[
"Bishop",
"N. T.",
""
]
] | The characteristic formalism in numerical relativity, which has been developed to study gravitational waves, and the observer metric approach in observational cosmology both make use of coordinate systems based on null cones. In this paper, these coordinate systems are compared and it is then demonstrated how character... |
1405.7907 | Sean Carroll | Sean M. Carroll and Charles T. Sebens | Many Worlds, the Born Rule, and Self-Locating Uncertainty | 15 pages. A version of this paper appears as a chapter in Quantum
Theory: A Two-Time Success Story, Yakir Aharonov Festschrift (2013), D.C.
Struppa, J.M. Tollaksen, eds. (Springer-Verlag), p. 157. This work is a
summary of a more comprehensive paper at http://arxiv.org/abs/arXiv:1405.7577 | null | 10.1007/978-88-470-5217-8_10 | CALT-68-2929 | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a derivation of the Born Rule in the context of the Everett
(Many-Worlds) approach to quantum mechanics. Our argument is based on the idea
of self-locating uncertainty: in the period between the wave function branching
via decoherence and an observer registering the outcome of the measurement,
that observe... | [
{
"created": "Fri, 30 May 2014 16:19:05 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Jun 2014 08:16:10 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Mar 2015 16:31:04 GMT",
"version": "v3"
}
] | 2015-06-19 | [
[
"Carroll",
"Sean M.",
""
],
[
"Sebens",
"Charles T.",
""
]
] | We provide a derivation of the Born Rule in the context of the Everett (Many-Worlds) approach to quantum mechanics. Our argument is based on the idea of self-locating uncertainty: in the period between the wave function branching via decoherence and an observer registering the outcome of the measurement, that observer ... |
1612.01236 | Ivan Agullo | Ivan Agullo and Parampreet Singh | Loop Quantum Cosmology: A brief review | 47 pages, 3 figures. To appear as a chapter contribution for a volume
edited by A. Ashtekar and J. Pullin, to be published in the World Scientific
series "100 Years of General Relativity." | null | null | LSU-REL-12160416 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the last decade, progress on quantization of homogeneous cosmological
spacetimes using techniques of loop quantum gravity has led to insights on
various fundamental questions and has opened new avenues to explore Planck
scale physics. These include the problem of singularities and their possible
generic resolution... | [
{
"created": "Mon, 5 Dec 2016 03:26:24 GMT",
"version": "v1"
}
] | 2016-12-06 | [
[
"Agullo",
"Ivan",
""
],
[
"Singh",
"Parampreet",
""
]
] | In the last decade, progress on quantization of homogeneous cosmological spacetimes using techniques of loop quantum gravity has led to insights on various fundamental questions and has opened new avenues to explore Planck scale physics. These include the problem of singularities and their possible generic resolution, ... |
1911.11513 | Ioannis Gialamas | Ioannis D. Gialamas and A. B. Lahanas | Reheating in $R^2$ Palatini inflationary models | 38 pages, 14 figures, pdflatex, text, figures and references added,
formulas updated | Phys. Rev. D 101, 084007 (2020) | 10.1103/PhysRevD.101.084007 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider $R^2$ inflation in the Palatini gravity assuming the existence of
scalar fields, coupled to gravity in the most general manner. These theories,
in the Einstein frame, and for one scalar field $h$, share common features with
$K$ - inflation models. We apply this formalism for the study of popular
inflation... | [
{
"created": "Tue, 26 Nov 2019 13:21:33 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Dec 2019 10:56:34 GMT",
"version": "v2"
},
{
"created": "Tue, 3 Mar 2020 12:32:51 GMT",
"version": "v3"
}
] | 2020-04-08 | [
[
"Gialamas",
"Ioannis D.",
""
],
[
"Lahanas",
"A. B.",
""
]
] | We consider $R^2$ inflation in the Palatini gravity assuming the existence of scalar fields, coupled to gravity in the most general manner. These theories, in the Einstein frame, and for one scalar field $h$, share common features with $K$ - inflation models. We apply this formalism for the study of popular inflationar... |
1705.07361 | Anton Sheykin | S. A. Paston, E. N. Semenova, V. A. Franke, A. A. Sheykin | Algebra of Implicitly Defined Constraints for Gravity as the General
Form of Embedding Theory | 11 pages | Gravit. Cosmol. (2017) 23:1 | 10.1134/S0202289317010145 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the embedding theory, the approach to gravity proposed by Regge
and Teitelboim, in which 4D space-time is treated as a surface in
high-dimensional flat ambient space. In its general form, which does not
contain artificially imposed constraints, this theory can be viewed as an
extension of GR. In the prese... | [
{
"created": "Sat, 20 May 2017 21:54:40 GMT",
"version": "v1"
}
] | 2017-05-23 | [
[
"Paston",
"S. A.",
""
],
[
"Semenova",
"E. N.",
""
],
[
"Franke",
"V. A.",
""
],
[
"Sheykin",
"A. A.",
""
]
] | We consider the embedding theory, the approach to gravity proposed by Regge and Teitelboim, in which 4D space-time is treated as a surface in high-dimensional flat ambient space. In its general form, which does not contain artificially imposed constraints, this theory can be viewed as an extension of GR. In the present... |
1409.3476 | Jeremy Rekier | Jeremy Rekier and Isabel Cordero-Carrion and Andre Fuzfa | Fully relativistic nonlinear cosmological evolution in spherical
symmetry using the BSSN formalism | 11 pages, 12 figures | Phys. Rev. D 91, 024025 (2015) | 10.1103/PhysRevD.91.024025 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a fully relativistic numerical method for the study of
cosmological problems using the Baumgarte-Shapiro-Shibata-Nakamura formalism on
a dynamical Friedmann-Lema\^itre-Robertson-Walker background. This has many
potential applications including the study of the growth of structures beyond
the linear regime.... | [
{
"created": "Thu, 11 Sep 2014 15:35:37 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jan 2015 20:51:16 GMT",
"version": "v2"
}
] | 2015-01-22 | [
[
"Rekier",
"Jeremy",
""
],
[
"Cordero-Carrion",
"Isabel",
""
],
[
"Fuzfa",
"Andre",
""
]
] | We present a fully relativistic numerical method for the study of cosmological problems using the Baumgarte-Shapiro-Shibata-Nakamura formalism on a dynamical Friedmann-Lema\^itre-Robertson-Walker background. This has many potential applications including the study of the growth of structures beyond the linear regime. W... |
2309.02359 | Abraham Harte | Abraham I. Harte, David Dwyer | Local symmetries as constraints on the motion of freely-falling extended
bodies | 25 pages, minor changes | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Different extended objects can fall in different ways, depending on their
internal structures. Some motions are nevertheless impossible, regardless of
internal structure. This paper derives universal constraints on extended-body
motion, both in Newtonian gravity and in general relativity. In both theories,
we identif... | [
{
"created": "Tue, 5 Sep 2023 16:20:14 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Sep 2023 15:07:00 GMT",
"version": "v2"
}
] | 2023-09-14 | [
[
"Harte",
"Abraham I.",
""
],
[
"Dwyer",
"David",
""
]
] | Different extended objects can fall in different ways, depending on their internal structures. Some motions are nevertheless impossible, regardless of internal structure. This paper derives universal constraints on extended-body motion, both in Newtonian gravity and in general relativity. In both theories, we identify ... |
gr-qc/0205006 | Myron Bander | Myron Bander | An explicit time variable for cosmology and the matter-vacuum energy
coincidence | 5 pages REVTEX4 | null | null | UCI-TR-2002-15 | gr-qc hep-ph hep-th | null | By allowing for non zero vacuum expectation values for some of the fields
that appear in the Hamiltonian constraint of canonical general relativity a
time variable, with usual properties, can be identified; the constraint plays
the role of the ordinary Hamiltonian. The energy eigenvalues contribute to the
variation o... | [
{
"created": "Wed, 1 May 2002 20:57:13 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bander",
"Myron",
""
]
] | By allowing for non zero vacuum expectation values for some of the fields that appear in the Hamiltonian constraint of canonical general relativity a time variable, with usual properties, can be identified; the constraint plays the role of the ordinary Hamiltonian. The energy eigenvalues contribute to the variation of ... |
gr-qc/0505152 | Peter Dimitris Rippis | Peter D. Rippis | Dynamics of radiation dominated branes: Vacuum dynamics from radiation | 12 pages, 1 fig., typos and reference corrected. Submitted for
publication | null | null | null | gr-qc astro-ph hep-th | null | I point out a symmetry, between equations of state for polytropic fluids, in
the equation of motion of a spherically symmetric singular shell embedded in
4-d and 5-d vacuum spacetimes. In particular the equation of motion of a shell
consisting of radiation has the same form as for a vacuum shell or domain wall.
| [
{
"created": "Mon, 30 May 2005 16:04:12 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Jun 2005 12:59:23 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Rippis",
"Peter D.",
""
]
] | I point out a symmetry, between equations of state for polytropic fluids, in the equation of motion of a spherically symmetric singular shell embedded in 4-d and 5-d vacuum spacetimes. In particular the equation of motion of a shell consisting of radiation has the same form as for a vacuum shell or domain wall. |
1204.0869 | Valery Kiselev | V. V. Kiselev | CMBR anisotropy in the framework of cosmological extrapolation of MOND | 18 pages, 5 eps-figures, references and comments added | null | null | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A modified gravity involving a critical acceleration, as empirically
established at galactic scales and successfully tested by data on supernovae of
type Ia, can fit the measured multipole spectrum of anisotropy in the cosmic
microwave background radiation, so that a dark sector of Universe is
constructively mimicked... | [
{
"created": "Wed, 4 Apr 2012 05:35:36 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Jun 2012 06:25:54 GMT",
"version": "v2"
}
] | 2012-06-25 | [
[
"Kiselev",
"V. V.",
""
]
] | A modified gravity involving a critical acceleration, as empirically established at galactic scales and successfully tested by data on supernovae of type Ia, can fit the measured multipole spectrum of anisotropy in the cosmic microwave background radiation, so that a dark sector of Universe is constructively mimicked a... |
gr-qc/9909014 | Steven Carlip | S. Carlip | Kinetic Energy and the Equivalence Principle | 11 pages, LaTeX; pedagogical paper sent to archive at students'
request | Am.J.Phys.66:409-413,1998 | 10.1119/1.18885 | UCD-97-10 | gr-qc | null | According to the general theory of relativity, kinetic energy contributes to
gravitational mass. Surprisingly, the observational evidence for this
prediction does not seem to be discussed in the literature. I reanalyze
existing experimental data to test the equivalence principle for the kinetic
energy of atomic elect... | [
{
"created": "Fri, 3 Sep 1999 20:25:38 GMT",
"version": "v1"
}
] | 2011-01-13 | [
[
"Carlip",
"S.",
""
]
] | According to the general theory of relativity, kinetic energy contributes to gravitational mass. Surprisingly, the observational evidence for this prediction does not seem to be discussed in the literature. I reanalyze existing experimental data to test the equivalence principle for the kinetic energy of atomic electro... |
1601.04040 | Ali \"Ovg\"un | I. Sakalli and A. \"Ovg\"un | Hawking Radiation of Mass Generating Particles From Dyonic Reissner
Nordstr\"{o}m Black Hole | 8 pages, Accepted for publication in Journal of Astrophysics and
Astronomy | J Astrophys Astron (2016) 37: 21 | 10.1007/s12036-016-9397-6 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Hawking radiation is considered as a quantum tunneling process, which can
be studied in the framework of the Hamilton-Jacobi method. In this study, we
present the wave equation for a mass generating massive and charged scalar
particle (boson). In sequel, we analyze the quantum tunneling of these bosons
from a gen... | [
{
"created": "Fri, 15 Jan 2016 19:29:43 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Jun 2016 11:21:06 GMT",
"version": "v2"
}
] | 2016-08-23 | [
[
"Sakalli",
"I.",
""
],
[
"Övgün",
"A.",
""
]
] | The Hawking radiation is considered as a quantum tunneling process, which can be studied in the framework of the Hamilton-Jacobi method. In this study, we present the wave equation for a mass generating massive and charged scalar particle (boson). In sequel, we analyze the quantum tunneling of these bosons from a gener... |
gr-qc/0002080 | Maurizio Gasperini | M. Gasperini | Birth of the Universe as anti-tunnelling from the string perturbative
vacuum | 11 pages, Latex, three figures included using epsfig. Essay written
for the 2000 Awards for Essays on Gravitation (Gravity Research Foundation,
Wellesley Hills, MA), and selected for Honorable Mention. One reference
added. To appear in Int. J. Mod. Phys. D | Int.J.Mod.Phys. D10 (2001) 15-24 | 10.1142/S0218271801000585 | BA-TH/99-367 | gr-qc hep-th | null | The decay of the string perturbative vacuum, if triggered by a suitable,
duality-breaking dilaton potential, can efficiently proceed via the parametric
amplification of the Wheeler-De Witt wave function in superspace, and can
appropriately describe the birth of our Universe as a quantum process of pair
production fro... | [
{
"created": "Wed, 23 Feb 2000 14:00:50 GMT",
"version": "v1"
},
{
"created": "Wed, 17 May 2000 12:51:29 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Gasperini",
"M.",
""
]
] | The decay of the string perturbative vacuum, if triggered by a suitable, duality-breaking dilaton potential, can efficiently proceed via the parametric amplification of the Wheeler-De Witt wave function in superspace, and can appropriately describe the birth of our Universe as a quantum process of pair production from ... |
1606.00713 | Saibal Ray | Debabrata Deb, Sourav Roy Chowdhury, Saibal Ray, Farook Rahaman and
B.K. Guha | Relativistic model for anisotropic strange stars | 21 pages, 11 figures, 2 tables, Accepted in Annals of physics | null | 10.1016/j.aop.2017.10.010 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we attempt to find a singularity free solution of Einstein's
field equations for compact stellar objects, precisely strange (quark) stars,
considering Schwarzschild metric as the exterior spacetime. To this end, we
consider that the stellar object is spherically symmetric, static and
anisotropic in n... | [
{
"created": "Mon, 30 May 2016 12:47:58 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Oct 2017 11:21:23 GMT",
"version": "v2"
}
] | 2017-10-19 | [
[
"Deb",
"Debabrata",
""
],
[
"Chowdhury",
"Sourav Roy",
""
],
[
"Ray",
"Saibal",
""
],
[
"Rahaman",
"Farook",
""
],
[
"Guha",
"B. K.",
""
]
] | In this article, we attempt to find a singularity free solution of Einstein's field equations for compact stellar objects, precisely strange (quark) stars, considering Schwarzschild metric as the exterior spacetime. To this end, we consider that the stellar object is spherically symmetric, static and anisotropic in nat... |
2301.07657 | Julian Barbour | Julian Barbour | Gravity's Creative Core | 17 pages, 2 figures | null | null | null | gr-qc hep-th physics.hist-ph | http://creativecommons.org/licenses/by-nc-nd/4.0/ | I argue that the essence of gravity can be understood only in the context of
the universe and that unrecognised implicit retention of Newtonian absolute
scale and the impact of thermodynamics have obscured it. Typical attempts to
resolve the conflict between maximal matter entropy in the early universe and
the second... | [
{
"created": "Wed, 18 Jan 2023 17:03:39 GMT",
"version": "v1"
}
] | 2023-01-19 | [
[
"Barbour",
"Julian",
""
]
] | I argue that the essence of gravity can be understood only in the context of the universe and that unrecognised implicit retention of Newtonian absolute scale and the impact of thermodynamics have obscured it. Typical attempts to resolve the conflict between maximal matter entropy in the early universe and the second l... |
0809.1140 | Sini R | Sini R, V. C. Kuriakose | Quasinormal modes of RN black hole space time with cosmic string in a
Dirac field | 12 pages, 28 figures | Mod.Phys.Lett.A24:2025-2037,2009 | 10.1142/S0217732309030394 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We evaluate quasinormal mode frequencies for RN black hole space times with
cosmic string perturbed by a massless Dirac field, using P\"{o}schl-Teller
potential method. We find that only in the case of RN black hole having small
charge, the effect due to cosmic string will dominate when perturbed by a
negatively char... | [
{
"created": "Sat, 6 Sep 2008 06:56:42 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"R",
"Sini",
""
],
[
"Kuriakose",
"V. C.",
""
]
] | We evaluate quasinormal mode frequencies for RN black hole space times with cosmic string perturbed by a massless Dirac field, using P\"{o}schl-Teller potential method. We find that only in the case of RN black hole having small charge, the effect due to cosmic string will dominate when perturbed by a negatively charge... |
2211.04059 | Maximilian Kraft | David Fajman and Maximilian Kraft | Recollapsing spacetimes with $\Lambda<0$ | 28 pages, 3 figures | null | 10.1088/1361-6382/acd97c | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We show that any homogeneous initial data set with $\Lambda<0$ on a product
3-manifold of the orthogonal form $(F\times \mathbb
S^1,a_0^2dz^2+b_0^2\sigma^2,c_0dz^2+d_0\sigma)$, where $(F,\sigma)$ is a closed
2-surface of constant curvature and $a_0,..., d_0$ are suitable constants,
recollapses under the Einstein-flow... | [
{
"created": "Tue, 8 Nov 2022 07:38:12 GMT",
"version": "v1"
}
] | 2023-07-05 | [
[
"Fajman",
"David",
""
],
[
"Kraft",
"Maximilian",
""
]
] | We show that any homogeneous initial data set with $\Lambda<0$ on a product 3-manifold of the orthogonal form $(F\times \mathbb S^1,a_0^2dz^2+b_0^2\sigma^2,c_0dz^2+d_0\sigma)$, where $(F,\sigma)$ is a closed 2-surface of constant curvature and $a_0,..., d_0$ are suitable constants, recollapses under the Einstein-flow w... |
1108.3796 | Leandro Belo | L.R.A. Belo, E.P. Spaniol, J.A. de Deus and V.C. de Andrade | A look on the internal structure of Teleparallel Equivalent of General
Relativity | 13 pages | Adv. Studies Theor. Phys., 6, no. 7, 325 - 337 (2012) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the Dirac procedure to treat constraints dynamical sistems applied to
gravitation, as described in the context of Teleparallel Equivalent of General
Relativity (TEGR), we investigate, from the first class constraints, the gauge
transformations in the fundamental field: the components of tetrads. We have
shown t... | [
{
"created": "Thu, 18 Aug 2011 17:03:42 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Aug 2011 04:54:43 GMT",
"version": "v2"
},
{
"created": "Sun, 30 Sep 2012 00:12:11 GMT",
"version": "v3"
}
] | 2012-10-02 | [
[
"Belo",
"L. R. A.",
""
],
[
"Spaniol",
"E. P.",
""
],
[
"de Deus",
"J. A.",
""
],
[
"de Andrade",
"V. C.",
""
]
] | Using the Dirac procedure to treat constraints dynamical sistems applied to gravitation, as described in the context of Teleparallel Equivalent of General Relativity (TEGR), we investigate, from the first class constraints, the gauge transformations in the fundamental field: the components of tetrads. We have shown tha... |
1011.0214 | Paul Wesson | Paul S. Wesson | The Embedding of General Relativity in Five-Dimensional Canonical Space:
A Short History and a Review of Recent Physical Progress | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Einstein theory can be embedded in Kaluza-Klein theory, and in particular all
4D vacuum solutions can be embedded in 5D (pure) canonical space where
spacetime is independent of the extra coordinate. The uniqueness of 5D
canonical space is quickly reproven, and its history and implications briefly
reviewed. For 4D ant... | [
{
"created": "Sun, 31 Oct 2010 22:47:07 GMT",
"version": "v1"
}
] | 2010-11-02 | [
[
"Wesson",
"Paul S.",
""
]
] | Einstein theory can be embedded in Kaluza-Klein theory, and in particular all 4D vacuum solutions can be embedded in 5D (pure) canonical space where spacetime is independent of the extra coordinate. The uniqueness of 5D canonical space is quickly reproven, and its history and implications briefly reviewed. For 4D anti-... |
0704.2889 | Marc Mars | Lars Andersson, Marc Mars, Walter Simon | Stability of marginally outer trapped surfaces and existence of
marginally outer trapped tubes | 33 pages, no figures, typos corrected, minor changes in presentation | null | null | null | gr-qc | null | The present work extends our short communication Phys. Rev. Lett. 95, 111102
(2005). For smooth marginally outer trapped surfaces (MOTS) in a smooth
spacetime we define stability with respect to variations along arbitrary
vectors v normal to the MOTS. After giving some introductory material about
linear non self-adjo... | [
{
"created": "Sun, 22 Apr 2007 15:13:38 GMT",
"version": "v1"
},
{
"created": "Tue, 22 May 2007 15:13:59 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Andersson",
"Lars",
""
],
[
"Mars",
"Marc",
""
],
[
"Simon",
"Walter",
""
]
] | The present work extends our short communication Phys. Rev. Lett. 95, 111102 (2005). For smooth marginally outer trapped surfaces (MOTS) in a smooth spacetime we define stability with respect to variations along arbitrary vectors v normal to the MOTS. After giving some introductory material about linear non self-adjoin... |
2404.09374 | Gokhan Alkac | Gokhan Alkac, Mehmet Kemal Gumus, Mehmet Ali Olpak | Classical double copy in the black hole mini-superspace | Citation added | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We give a novel formulation of classical double copy in the mini-superspace
of static, spherically symmetric black holes where the map between the
solutions of general relativity and Maxwell's theory can be realized in
Boyer-Lindsquit coordinates. By employing the reduced action principle, we show
that the double cop... | [
{
"created": "Sun, 14 Apr 2024 22:55:49 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Apr 2024 09:44:37 GMT",
"version": "v2"
},
{
"created": "Fri, 19 Apr 2024 12:34:59 GMT",
"version": "v3"
}
] | 2024-04-22 | [
[
"Alkac",
"Gokhan",
""
],
[
"Gumus",
"Mehmet Kemal",
""
],
[
"Olpak",
"Mehmet Ali",
""
]
] | We give a novel formulation of classical double copy in the mini-superspace of static, spherically symmetric black holes where the map between the solutions of general relativity and Maxwell's theory can be realized in Boyer-Lindsquit coordinates. By employing the reduced action principle, we show that the double copy ... |
1709.02083 | Nolene Naidu | NF Naidu, M Govender, S Thirukkanesh, SD Maharaj | Radiating fluid sphere immersed in an anisotropic atmosphere | 12 pages, 4 figures | Gen Relativ Gravit (2017) 49:95 | 10.1007/s10714-017-2258-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We model a radiating star undergoing dissipative gravitational collapse in
the form of radial heat flux. The exterior of the collapsing star is described
by the generalised Vaidya solution representing a mixture of null radiation and
strings. Our model generalises previously known results of constant string
density a... | [
{
"created": "Thu, 7 Sep 2017 05:59:58 GMT",
"version": "v1"
}
] | 2017-09-13 | [
[
"Naidu",
"NF",
""
],
[
"Govender",
"M",
""
],
[
"Thirukkanesh",
"S",
""
],
[
"Maharaj",
"SD",
""
]
] | We model a radiating star undergoing dissipative gravitational collapse in the form of radial heat flux. The exterior of the collapsing star is described by the generalised Vaidya solution representing a mixture of null radiation and strings. Our model generalises previously known results of constant string density atm... |
1406.0401 | Alessandro Nagar | Thibault Damour and Alessandro Nagar | A new analytic representation of the ringdown waveform of coalescing
spinning black hole binaries | 7 pages, 7 figures. Results improved with respect to first version.
To appear in Phys. Rev. D | null | 10.1103/PhysRevD.90.024054 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new way of analyzing, and analytically representing, the
ringdown part of the gravitational wave signal emitted by coalescing black hole
binaries.By contrast with the usual {\it linear} decomposition of the
multipolar complex waveform $h(t)$ in a sum of quasi-normal modes, our
procedure relies on a {\it ... | [
{
"created": "Mon, 2 Jun 2014 14:58:43 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Jul 2014 15:35:59 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Damour",
"Thibault",
""
],
[
"Nagar",
"Alessandro",
""
]
] | We propose a new way of analyzing, and analytically representing, the ringdown part of the gravitational wave signal emitted by coalescing black hole binaries.By contrast with the usual {\it linear} decomposition of the multipolar complex waveform $h(t)$ in a sum of quasi-normal modes, our procedure relies on a {\it mu... |
gr-qc/9908015 | Zoltan Perjes | L\'aszl\'o \'A. Gergely, Zolt\'an I. Perj\'es and M\'aty\'as Vas\'uth | The true and eccentric anomaly parametrizations of the perturbed Kepler
motion | 19 pages, to appear in ApJ Suppl | Astrophys.J.Suppl. 126 (2000) 79-84 | 10.1086/313290 | null | gr-qc astro-ph | null | The true and eccentric anomaly parametrizations of the Kepler motion are
generalized to quasiperiodic orbits, by considering perturbations of the radial
part of the kinetic energy in a form of a series of negative powers of the
orbital radius. A toolchest of methods for averaging observables as functions
of the energ... | [
{
"created": "Thu, 5 Aug 1999 11:32:38 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Gergely",
"László Á.",
""
],
[
"Perjés",
"Zoltán I.",
""
],
[
"Vasúth",
"Mátyás",
""
]
] | The true and eccentric anomaly parametrizations of the Kepler motion are generalized to quasiperiodic orbits, by considering perturbations of the radial part of the kinetic energy in a form of a series of negative powers of the orbital radius. A toolchest of methods for averaging observables as functions of the energy ... |
1207.6602 | Peter K.F. Kuhfittig | Peter K. F. Kuhfittig | Neutron star interiors and topology change | 7 pages, no figures | Advances in Mathematical Physics, vol. 2013, Article ID 630196, 4
pages, 2013 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quark matter is believed to exist in the center of neutron stars. A combined
model consisting of quark matter and ordinary matter is used to show that the
extreme conditions existing in the center could result in a topology change,
that is, in the formation of wormholes.
| [
{
"created": "Fri, 27 Jul 2012 17:22:03 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Jan 2013 15:17:57 GMT",
"version": "v2"
},
{
"created": "Mon, 11 Mar 2013 17:17:57 GMT",
"version": "v3"
},
{
"created": "Fri, 29 Mar 2013 17:49:41 GMT",
"version": "v4"
},
{
"cr... | 2021-12-14 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | Quark matter is believed to exist in the center of neutron stars. A combined model consisting of quark matter and ordinary matter is used to show that the extreme conditions existing in the center could result in a topology change, that is, in the formation of wormholes. |
1104.4706 | Vasily Borodikhin | V. N. Borodikhin | Vector Theory of Gravity: quantum and classical effects, renormalization | 16 pages, 4 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we make quantization of gravitation interaction within the
framework of a vector theory of gravitation for the first time. The work
demonstrates that this theory meets the requirement of renormalizability. Here
we consider some quantum effects, particularly graviton scattering on fermion
and corrections... | [
{
"created": "Mon, 25 Apr 2011 10:59:57 GMT",
"version": "v1"
},
{
"created": "Sat, 12 May 2012 05:23:05 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Oct 2012 09:41:41 GMT",
"version": "v3"
}
] | 2012-10-29 | [
[
"Borodikhin",
"V. N.",
""
]
] | In this work, we make quantization of gravitation interaction within the framework of a vector theory of gravitation for the first time. The work demonstrates that this theory meets the requirement of renormalizability. Here we consider some quantum effects, particularly graviton scattering on fermion and corrections t... |
2012.07392 | Callum Hunter | Callum Hunter | Effective Non-Minimal Quadratic Gravity and the Classical Cut-Off | 27 pages, 1 Figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we consider Quadratic Gravity as a low energy effective field
theory of some unknown UV-complete theory of gravity. Using the spin-2 ghost
pathology that occurs in Quadratic Gravity, we derive maximum value for the
classical cut-off of the low energy effective field theory in various
configurations. We ... | [
{
"created": "Mon, 14 Dec 2020 10:26:12 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Apr 2021 10:06:44 GMT",
"version": "v2"
}
] | 2021-04-08 | [
[
"Hunter",
"Callum",
""
]
] | In this paper we consider Quadratic Gravity as a low energy effective field theory of some unknown UV-complete theory of gravity. Using the spin-2 ghost pathology that occurs in Quadratic Gravity, we derive maximum value for the classical cut-off of the low energy effective field theory in various configurations. We th... |
1304.0457 | Vasileios Paschalidis | Vasileios Paschalidis, Zachariah B. Etienne, Roman Gold, Stuart L.
Shapiro | An efficient spectral interpolation routine for the TwoPunctures code | Link for downloading the Einstein Toolkit version:
http://webusers.physics.illinois.edu/~vpaschal/TwoPuncturesET/ Link for
downloading the standalone version:
http://webusers.physics.illinois.edu/~vpaschal/TwoPunctures_Standalone/ | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | TwoPunctures is perhaps the most widely-adopted code for generating binary
black hole "puncture" initial data and interpolating these (spectral) data onto
evolution grids. In typical usage, the bulk of this code's run time is spent in
its spectral interpolation routine. We announce a new publicly-available
spectral i... | [
{
"created": "Mon, 1 Apr 2013 20:00:07 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Apr 2013 00:23:04 GMT",
"version": "v2"
}
] | 2013-04-05 | [
[
"Paschalidis",
"Vasileios",
""
],
[
"Etienne",
"Zachariah B.",
""
],
[
"Gold",
"Roman",
""
],
[
"Shapiro",
"Stuart L.",
""
]
] | TwoPunctures is perhaps the most widely-adopted code for generating binary black hole "puncture" initial data and interpolating these (spectral) data onto evolution grids. In typical usage, the bulk of this code's run time is spent in its spectral interpolation routine. We announce a new publicly-available spectral int... |
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