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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1802.00326 | Mohd Shahalam | M. Shahalam, Weiqiang Yang, R. Myrzakulov, Anzhong Wang | Late-time acceleration with steep exponential potentials | 9 pages, 5 figures, 2 tables | Eur. Phys. J. C (2017) 77:894 | 10.1140/epjc/s10052-017-5468-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this letter, we study the cosmological dynamics of steeper potential than
exponential. Our analysis shows that a simple extension of an exponential
potential allows to capture late-time cosmic acceleration and retain the
tracker behavior. We also perform statefinder and $Om$ diagnostics to
distinguish dark energy ... | [
{
"created": "Wed, 31 Jan 2018 07:27:41 GMT",
"version": "v1"
}
] | 2018-02-02 | [
[
"Shahalam",
"M.",
""
],
[
"Yang",
"Weiqiang",
""
],
[
"Myrzakulov",
"R.",
""
],
[
"Wang",
"Anzhong",
""
]
] | In this letter, we study the cosmological dynamics of steeper potential than exponential. Our analysis shows that a simple extension of an exponential potential allows to capture late-time cosmic acceleration and retain the tracker behavior. We also perform statefinder and $Om$ diagnostics to distinguish dark energy mo... |
gr-qc/0611053 | Hakan Andreasson | Hakan Andreasson, Gerhard Rein | On the steady states of the spherically symmetric Einstein-Vlasov system | 34 pages, 18 figures, LaTex | Class.Quant.Grav.24:1809-1832,2007 | 10.1088/0264-9381/24/7/008 | null | gr-qc | null | Using both numerical and analytical tools we study various features of
static, spherically symmetric solutions of the Einstein-Vlasov system. In
particular, we investigate the possible shapes of their mass-energy density and
find that they can be multi-peaked, we give numerical evidence and a partial
proof for the co... | [
{
"created": "Wed, 8 Nov 2006 13:37:23 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Andreasson",
"Hakan",
""
],
[
"Rein",
"Gerhard",
""
]
] | Using both numerical and analytical tools we study various features of static, spherically symmetric solutions of the Einstein-Vlasov system. In particular, we investigate the possible shapes of their mass-energy density and find that they can be multi-peaked, we give numerical evidence and a partial proof for the conj... |
1802.02661 | Jorge Pullin | Rodolfo Gambini and Jorge Pullin | Gravitation in terms of observables | 39 pages, 15 figures, RevTex, version published in CQG | Class. Quantum Grav. 35 215008 (2018) | 10.1088/1361-6382/aae449 | LSU-REL-020718 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the 1960's, Mandelstam proposed a new approach to gauge theories and
gravity based on loops. The program for gauge theories was completed for
Yang--Mills theories by Gambini and Trias in the 1980's. Gauge theories could
be understood as representations of certain group: the group of loops. The same
formalism could... | [
{
"created": "Wed, 7 Feb 2018 22:36:42 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Mar 2018 15:31:12 GMT",
"version": "v2"
},
{
"created": "Wed, 17 Oct 2018 14:40:56 GMT",
"version": "v3"
}
] | 2018-10-18 | [
[
"Gambini",
"Rodolfo",
""
],
[
"Pullin",
"Jorge",
""
]
] | In the 1960's, Mandelstam proposed a new approach to gauge theories and gravity based on loops. The program for gauge theories was completed for Yang--Mills theories by Gambini and Trias in the 1980's. Gauge theories could be understood as representations of certain group: the group of loops. The same formalism could n... |
1408.4602 | Andrea Geralico | Donato Bini, Christian Cherubini, Simonetta Filippi, Andrea Geralico | The effective geometry of the $n=1$ uniformly rotating self-gravitating
polytrope | 16 pages, 8 figures; published version | Phys. Rev. D 82, 044005 (2010) | 10.1103/PhysRevD.82.044005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The \lq\lq effective geometry" formalism is used to study the perturbations
of a perfect barotropic Newtonian self-gravitating rotating and compressible
fluid coupled with gravitational backreaction. The case of a uniformly rotating
polytrope with index $n=1$ is investigated, due to its analytical tractability.
Speci... | [
{
"created": "Wed, 20 Aug 2014 10:51:37 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Bini",
"Donato",
""
],
[
"Cherubini",
"Christian",
""
],
[
"Filippi",
"Simonetta",
""
],
[
"Geralico",
"Andrea",
""
]
] | The \lq\lq effective geometry" formalism is used to study the perturbations of a perfect barotropic Newtonian self-gravitating rotating and compressible fluid coupled with gravitational backreaction. The case of a uniformly rotating polytrope with index $n=1$ is investigated, due to its analytical tractability. Special... |
1305.4603 | Semyon Dyatlov | Semyon Dyatlov and Maciej Zworski | Trapping of waves and null geodesics for rotating black holes | 8 pages, 7 figures; minor changes suggested by the referee | Phys. Rev. D 88, 084037 (2013) | 10.1103/PhysRevD.88.084037 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present dynamical properties of linear waves and null geodesics valid for
Kerr and Kerr-de Sitter black holes and their stationary perturbations. The two
are intimately linked by the geometric optics approximation. For the
nullgeodesic flow the key property is the r-normal hyperbolicity of the trapped
set and for ... | [
{
"created": "Mon, 20 May 2013 18:32:40 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Sep 2013 19:29:16 GMT",
"version": "v2"
},
{
"created": "Fri, 25 Oct 2013 15:22:58 GMT",
"version": "v3"
}
] | 2013-10-28 | [
[
"Dyatlov",
"Semyon",
""
],
[
"Zworski",
"Maciej",
""
]
] | We present dynamical properties of linear waves and null geodesics valid for Kerr and Kerr-de Sitter black holes and their stationary perturbations. The two are intimately linked by the geometric optics approximation. For the nullgeodesic flow the key property is the r-normal hyperbolicity of the trapped set and for li... |
gr-qc/9502005 | Frank Gronwald | Frank Gronwald | ON NON-RIEMANNIAN PARALLEL TRANSPORT IN REGGE CALCULUS | 12 pages, Plain-TEX, two figures (available from the author) | Class.Quant.Grav.12:1181-1190,1995 | 10.1088/0264-9381/12/5/009 | CPP-94-38 | gr-qc | null | We discuss the possibility of incorporating non-Riemannian parallel transport
into Regge calculus. It is shown that every Regge lattice is locally equivalent
to a space of constant curvature. Therefore well known-concepts of differential
geometry imply the definition of an arbitrary linear affine connection on a
Regg... | [
{
"created": "Wed, 1 Feb 1995 11:21:31 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Gronwald",
"Frank",
""
]
] | We discuss the possibility of incorporating non-Riemannian parallel transport into Regge calculus. It is shown that every Regge lattice is locally equivalent to a space of constant curvature. Therefore well known-concepts of differential geometry imply the definition of an arbitrary linear affine connection on a Regge ... |
0803.4000 | Jurjen Koksma | Jurjen F. Koksma (UU) Tomislav Prokopec (UU) | Effect of the Trace Anomaly on the Cosmological Constant | 18 pages, 11 figures, published version | Phys.Rev.D78:023508,2008 | 10.1103/PhysRevD.78.023508 | ITP-UU-08/08, SPIN-08/08 | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been argued that the quantum (conformal) trace anomaly could
potentially provide us with a dynamical explanation of the cosmological
constant problem. In this paper, however, we show by means of a semiclassical
analysis that the trace anomaly does not affect the cosmological constant. We
construct the effectiv... | [
{
"created": "Thu, 27 Mar 2008 19:52:33 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Aug 2008 13:20:59 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Koksma",
"Jurjen F.",
"",
"UU"
],
[
"Prokopec",
"Tomislav",
"",
"UU"
]
] | It has been argued that the quantum (conformal) trace anomaly could potentially provide us with a dynamical explanation of the cosmological constant problem. In this paper, however, we show by means of a semiclassical analysis that the trace anomaly does not affect the cosmological constant. We construct the effective ... |
1205.6611 | Stephen Fairhurst | Stephen Fairhurst | Improved source localization with LIGO India | 7 pages, 3 figures, accepted for publication in proceedings of
ICGC2011 conference. Localization figures updated | null | 10.1088/1742-6596/484/1/012007 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A global network of advanced gravitational wave interferometric detectors is
under construction. These detectors will offer an order of magnitude
improvement in sensitivity over the initial detectors and will usher in the era
of gravitational wave astronomy. In this paper, we evaluate the benefits of
relocating one o... | [
{
"created": "Wed, 30 May 2012 10:02:38 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Sep 2012 09:03:23 GMT",
"version": "v2"
}
] | 2014-09-30 | [
[
"Fairhurst",
"Stephen",
""
]
] | A global network of advanced gravitational wave interferometric detectors is under construction. These detectors will offer an order of magnitude improvement in sensitivity over the initial detectors and will usher in the era of gravitational wave astronomy. In this paper, we evaluate the benefits of relocating one of ... |
1209.6098 | Kouji Nakamura | Kouji Nakamura | MG13 proceedings: Construction of gauge-invariant variables for
linear-order metric perturbations on an arbitrary background spacetime | 3 pages, no figure, Prepared for proceedings of the international
conference "Thirteenth Marcel Grossmann Meeting" | null | null | null | gr-qc astro-ph.CO hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An outline of a proof of the decomposition of the linear metric perturbation
into gauge-invariant and gauge-variant parts on an arbitrary background
spacetime is discussed through an exlicit construction of gauge-invariant and
gauge-variant parts. Although this outline is incomplete, yet, due to our
assumptions, we p... | [
{
"created": "Thu, 27 Sep 2012 00:20:30 GMT",
"version": "v1"
}
] | 2012-09-28 | [
[
"Nakamura",
"Kouji",
""
]
] | An outline of a proof of the decomposition of the linear metric perturbation into gauge-invariant and gauge-variant parts on an arbitrary background spacetime is discussed through an exlicit construction of gauge-invariant and gauge-variant parts. Although this outline is incomplete, yet, due to our assumptions, we pro... |
gr-qc/9710123 | Vanzo Luciano | D. Klemm, V. Moretti and L. Vanzo | Rotating Topological Black Holes | 25 pages, LateX, five ps figures added, minor errors corrected,
addition of new references, improved discussion of the conserved charges | Phys.Rev.D57:6127-6137,1998; Erratum-ibid.D60:109902,1999 | 10.1103/PhysRevD.57.6127 10.1103/PhysRevD.60.109902 | preprint UTF 408 | gr-qc | null | A class of metrics solving Einstein's equations with negative cosmological
constant and representing rotating, topological black holes is presented. All
such solutions are in the Petrov type-$D$ class, and can be obtained from the
most general metric known in this class by acting with suitably chosen discrete
groups ... | [
{
"created": "Tue, 28 Oct 1997 16:44:30 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Dec 1997 14:20:23 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Klemm",
"D.",
""
],
[
"Moretti",
"V.",
""
],
[
"Vanzo",
"L.",
""
]
] | A class of metrics solving Einstein's equations with negative cosmological constant and representing rotating, topological black holes is presented. All such solutions are in the Petrov type-$D$ class, and can be obtained from the most general metric known in this class by acting with suitably chosen discrete groups of... |
2112.11432 | Sandeep Aashish | Sandeep Aashish, Abhijith Ajith, Sukanta Panda, Rahul Thakur | Inflation with antisymmetric tensor field: new candidates | 40 pages, 16 figures; erroneous calculations have been replaced in
section V, references added; published version | JCAP04(2022)043 | 10.1088/1475-7516/2022/04/043 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study classes of inflation models driven by antisymmetric tensor field,
with minimal and nonminimal couplings to gravity, that address known issues of
such models considered in the past. First we show that with a different choice
of the background structure of antisymmetric tensor field, inflation is
supported eve... | [
{
"created": "Tue, 21 Dec 2021 18:49:37 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Dec 2021 14:19:54 GMT",
"version": "v2"
},
{
"created": "Fri, 22 Apr 2022 08:20:53 GMT",
"version": "v3"
}
] | 2022-04-25 | [
[
"Aashish",
"Sandeep",
""
],
[
"Ajith",
"Abhijith",
""
],
[
"Panda",
"Sukanta",
""
],
[
"Thakur",
"Rahul",
""
]
] | We study classes of inflation models driven by antisymmetric tensor field, with minimal and nonminimal couplings to gravity, that address known issues of such models considered in the past. First we show that with a different choice of the background structure of antisymmetric tensor field, inflation is supported even ... |
2408.03998 | Kelly MacDevette | Kelly MacDevette and Jess Worsley and Peter Dunsby and Saikat
Chakraborty | A model independent approach to the study of structure growth in $f(R)$
gravity | 25 pages, 14 figures | null | null | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Over the last decade, much attention has been given to the study of modified
gravity theories to find a more natural explanation for the late-time
acceleration of the Universe. Particular attention has focused on the so-called
$f(R)$ dark energy models. Instead of focusing on a particular f(R) model, we
present a com... | [
{
"created": "Wed, 7 Aug 2024 18:00:03 GMT",
"version": "v1"
}
] | 2024-08-09 | [
[
"MacDevette",
"Kelly",
""
],
[
"Worsley",
"Jess",
""
],
[
"Dunsby",
"Peter",
""
],
[
"Chakraborty",
"Saikat",
""
]
] | Over the last decade, much attention has been given to the study of modified gravity theories to find a more natural explanation for the late-time acceleration of the Universe. Particular attention has focused on the so-called $f(R)$ dark energy models. Instead of focusing on a particular f(R) model, we present a compl... |
1210.0379 | Jose Geraldo Pereira | J. G. Pereira | Lorentz Connections and Gravitation | Lecture presented at the Sixth International School on Field Theory
and Gravity, Petropolis, Brazil, 2012 | AIP Conf. Proc. 1483 (2012) 239-259 | 10.1063/1.4756972 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The different roles played by Lorentz connections in general relativity and
in teleparallel gravity are reviewed. Some of the consequences of this
difference are discussed.
| [
{
"created": "Mon, 1 Oct 2012 12:56:53 GMT",
"version": "v1"
}
] | 2012-10-02 | [
[
"Pereira",
"J. G.",
""
]
] | The different roles played by Lorentz connections in general relativity and in teleparallel gravity are reviewed. Some of the consequences of this difference are discussed. |
1508.05196 | Mohammad Akbar | M. M. Akbar and M. A. H. MacCallum | Static Axisymmetric Einstein Equations in Vacuum: Symmetry, New
Solutions and Ricci Solitons | null | null | 10.1103/PhysRevD.92.063017 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An explicit one-parameter Lie point symmetry of the four-dimensional vacuum
Einstein equations with two commuting hypersurface-orthogonal Killing vector
fields is presented. The parameter takes values over all of the real line and
the action of the group can be effected algebraically on any solution of the
system. Th... | [
{
"created": "Fri, 21 Aug 2015 07:39:16 GMT",
"version": "v1"
}
] | 2015-10-07 | [
[
"Akbar",
"M. M.",
""
],
[
"MacCallum",
"M. A. H.",
""
]
] | An explicit one-parameter Lie point symmetry of the four-dimensional vacuum Einstein equations with two commuting hypersurface-orthogonal Killing vector fields is presented. The parameter takes values over all of the real line and the action of the group can be effected algebraically on any solution of the system. This... |
gr-qc/9611013 | Nami Fux Svaiter | R. De Paola and N.F. Svaiter | Radiative processes for Rindler and accelerating observers and the
stress-tensor detector | 36 pages, Latex | null | null | null | gr-qc | null | We consider a monopole detector interacting with a massive scalar field. The
radiative processes are discussed from the accelerated frame point of view.
After this, we obtain the Minkowski vacuum stress tensor measured by the
accelerated observer using a non-gravitational stress tensor detector as
discussed by Ford a... | [
{
"created": "Tue, 5 Nov 1996 22:20:05 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"De Paola",
"R.",
""
],
[
"Svaiter",
"N. F.",
""
]
] | We consider a monopole detector interacting with a massive scalar field. The radiative processes are discussed from the accelerated frame point of view. After this, we obtain the Minkowski vacuum stress tensor measured by the accelerated observer using a non-gravitational stress tensor detector as discussed by Ford and... |
2010.05040 | Peter Rau B | Peter B. Rau and Armen Sedrakian | Oscillations of hypermassive compact stars with gravitational radiation
and viscosity | 7 pages, 3 figures, 1 table. Accepted by ApJ Letters | ApJ Letters, 902 (2020) L41 | 10.3847/2041-8213/abc015 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Binary neutron star mergers, such as the multimessenger GW170817 event, may
produce hypermassive compact objects which are supported against collapse by
the internal circulation of the fluid within the star. We compute their
unstable modes of oscillations driven by gravitational wave radiation and shear
viscosity, mo... | [
{
"created": "Sat, 10 Oct 2020 16:29:36 GMT",
"version": "v1"
}
] | 2020-11-03 | [
[
"Rau",
"Peter B.",
""
],
[
"Sedrakian",
"Armen",
""
]
] | Binary neutron star mergers, such as the multimessenger GW170817 event, may produce hypermassive compact objects which are supported against collapse by the internal circulation of the fluid within the star. We compute their unstable modes of oscillations driven by gravitational wave radiation and shear viscosity, mode... |
gr-qc/0405121 | Hongsheng Zhang | Hongsheng Zhang | Does the Cosmos have two times? Multi-time and cosmic acceleration | 5 pages, 3 figures, this version is heavily changed comparing to the
early one, main conclusion holds | null | null | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We put forward a multi-time theory, in frame of which the cosmic acceleration
is a natural phenomenon without cosmological constant or anything like that.
The main point of this theory is that each of the gravity interaction and
electromagnetic interaction has its own time, respectively. Also we give a
concrete model... | [
{
"created": "Tue, 25 May 2004 02:30:17 GMT",
"version": "v1"
},
{
"created": "Wed, 26 May 2004 02:58:06 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Jul 2004 06:16:14 GMT",
"version": "v3"
},
{
"created": "Thu, 15 Dec 2005 11:40:24 GMT",
"version": "v4"
},
{
"c... | 2010-04-16 | [
[
"Zhang",
"Hongsheng",
""
]
] | We put forward a multi-time theory, in frame of which the cosmic acceleration is a natural phenomenon without cosmological constant or anything like that. The main point of this theory is that each of the gravity interaction and electromagnetic interaction has its own time, respectively. Also we give a concrete model o... |
gr-qc/0006065 | Hrvoje Nikolic | Neven Bilic, Hrvoje Nikolic (Rudjer Boskovic Institute, Zagreb,
Croatia) | Self-gravitating bosons at nonzero temperature | 21 pages, 11 figures included, revised, to appear in Nucl. Phys. B | Nucl.Phys.B590:575-595,2000 | 10.1016/S0550-3213(00)00455-7 | null | gr-qc astro-ph hep-ph | null | A system of charged bosons at finite temperature and chemical potential is
studied in a general-relativistic framework. We assume that the boson fields
interact only gravitationally. At sufficiently low temperature the system
exists in two phases: the gas and the condensate. By studying the condensation
process numer... | [
{
"created": "Mon, 19 Jun 2000 11:21:17 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Jul 2000 09:31:41 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Bilic",
"Neven",
"",
"Rudjer Boskovic Institute, Zagreb,\n Croatia"
],
[
"Nikolic",
"Hrvoje",
"",
"Rudjer Boskovic Institute, Zagreb,\n Croatia"
]
] | A system of charged bosons at finite temperature and chemical potential is studied in a general-relativistic framework. We assume that the boson fields interact only gravitationally. At sufficiently low temperature the system exists in two phases: the gas and the condensate. By studying the condensation process numeric... |
2108.02902 | Juilson Pereira | Juilson A. P. Paiva, Matheus J. Lazo, and Vilson T. Zanchin | Generalized nonconservative gravitational field equations from Herglotz
action principle | null | null | 10.1103/PhysRevD.105.124023 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an alternative nonconservative gravitational theory based on the
Herglotz variational principle in a fully covariant form. The present model may
be seen as an improvement of the theory proposed in Ref. [Lazo et al, Phys.
Rev. D 95, 101501 (2017)], whose resulting theory is meaningful just in
particular coo... | [
{
"created": "Fri, 6 Aug 2021 01:04:33 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Aug 2021 22:30:39 GMT",
"version": "v2"
}
] | 2022-06-22 | [
[
"Paiva",
"Juilson A. P.",
""
],
[
"Lazo",
"Matheus J.",
""
],
[
"Zanchin",
"Vilson T.",
""
]
] | We present an alternative nonconservative gravitational theory based on the Herglotz variational principle in a fully covariant form. The present model may be seen as an improvement of the theory proposed in Ref. [Lazo et al, Phys. Rev. D 95, 101501 (2017)], whose resulting theory is meaningful just in particular coord... |
gr-qc/9710102 | Beverly K. Berger | Beverly K. Berger, David Garfinkle | Phenomenology of the Gowdy Universe on $T^3 \times R$ | 19 pages, 21 figures, uses Revtex, psfig | Phys.Rev.D57:4767-4777,1998 | 10.1103/PhysRevD.57.4767 | null | gr-qc | null | Numerical studies of the plane symmetric, vacuum Gowdy universe on $T^3
\times R$ yield strong support for the conjectured asymptotically velocity term
dominated (AVTD) behavior of its evolution toward the singularity except,
perhaps, at isolated spatial points. A generic solution is characterized by
spiky features a... | [
{
"created": "Tue, 21 Oct 1997 17:10:10 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Berger",
"Beverly K.",
""
],
[
"Garfinkle",
"David",
""
]
] | Numerical studies of the plane symmetric, vacuum Gowdy universe on $T^3 \times R$ yield strong support for the conjectured asymptotically velocity term dominated (AVTD) behavior of its evolution toward the singularity except, perhaps, at isolated spatial points. A generic solution is characterized by spiky features and... |
2206.09954 | Saptaswa Ghosh | Saptaswa Ghosh, Arpan Bhattacharyya | Analytical study of gravitational lensing in Kerr-Newman black-bounce
spacetime | 45 pages, 7 figures, 5 Tables, minor typos corrected | JCAP 11 (2022) 006 | 10.1088/1475-7516/2022/11/006 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the equatorial deflection angle of light rays propagating in
Kerr-Newman black-bounce spacetime. Furthermore, we analyze the light ray
trajectories and derive a closed-form formula for deflection angle in terms of
elliptic integrals. The deflection angle increases with the decrease of charge
and regula... | [
{
"created": "Mon, 20 Jun 2022 18:31:07 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Oct 2022 11:28:29 GMT",
"version": "v2"
},
{
"created": "Fri, 11 Nov 2022 16:30:58 GMT",
"version": "v3"
},
{
"created": "Sun, 28 May 2023 16:06:46 GMT",
"version": "v4"
}
] | 2023-05-30 | [
[
"Ghosh",
"Saptaswa",
""
],
[
"Bhattacharyya",
"Arpan",
""
]
] | We investigate the equatorial deflection angle of light rays propagating in Kerr-Newman black-bounce spacetime. Furthermore, we analyze the light ray trajectories and derive a closed-form formula for deflection angle in terms of elliptic integrals. The deflection angle increases with the decrease of charge and regulari... |
2007.01324 | Jasel Berra-Montiel | Jasel Berra-Montiel, Alberto Molgado | Quasi-probability distributions in Loop Quantum Cosmology | 12 pages, no figures | null | 10.1088/1361-6382/abb57a | null | gr-qc math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we introduce a complete family of parametrized
quasi-probability distributions in phase space and their corresponding Weyl
quantization maps with the aim to generalize the recently developed Wigner-Weyl
formalism within the Loop Quantum Cosmology program (LQC). In particular, we
intend to define those ... | [
{
"created": "Thu, 2 Jul 2020 18:05:32 GMT",
"version": "v1"
}
] | 2020-10-28 | [
[
"Berra-Montiel",
"Jasel",
""
],
[
"Molgado",
"Alberto",
""
]
] | In this paper, we introduce a complete family of parametrized quasi-probability distributions in phase space and their corresponding Weyl quantization maps with the aim to generalize the recently developed Wigner-Weyl formalism within the Loop Quantum Cosmology program (LQC). In particular, we intend to define those qu... |
1411.2386 | Mustapha Azreg-A\~"iou | Mustapha Azreg-A\"inou | Black hole thermodynamics: No inconsistency via the inclusion of the
missing P-V terms | 15 pages, 2 figures. Minor changes | Phys. Rev. D 91, 064049 (2015) | 10.1103/PhysRevD.91.064049 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The early literature on black hole thermodynamics ignored the $P$-$V$ term
associated with the existence of a fundamental physical constant in the black
hole solution. The inclusion of this constant in the first law becomes
inconsistent with the Smarr relation. Once the missing $P$-$V$ term introduced
is, it becomes ... | [
{
"created": "Mon, 10 Nov 2014 11:28:59 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Mar 2015 14:29:59 GMT",
"version": "v2"
}
] | 2016-02-22 | [
[
"Azreg-Aïnou",
"Mustapha",
""
]
] | The early literature on black hole thermodynamics ignored the $P$-$V$ term associated with the existence of a fundamental physical constant in the black hole solution. The inclusion of this constant in the first law becomes inconsistent with the Smarr relation. Once the missing $P$-$V$ term introduced is, it becomes cu... |
1910.12893 | Paolo Pani | Andrea Maselli, Paolo Pani, Leonardo Gualtieri, Emanuele Berti | Parametrized ringdown spin expansion coefficients: a data-analysis
framework for black-hole spectroscopy with multiple events | 15 pages, 8 figures. v2: matches published version | Phys. Rev. D 101, 024043 (2020) | 10.1103/PhysRevD.101.024043 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black-hole spectroscopy is arguably the most promising tool to test gravity
in extreme regimes and to probe the ultimate nature of black holes with
unparalleled precision. These tests are currently limited by the lack of a
ringdown parametrization that is both robust and accurate. We develop an
observable-based param... | [
{
"created": "Mon, 28 Oct 2019 18:02:12 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Jan 2020 09:56:21 GMT",
"version": "v2"
}
] | 2020-01-24 | [
[
"Maselli",
"Andrea",
""
],
[
"Pani",
"Paolo",
""
],
[
"Gualtieri",
"Leonardo",
""
],
[
"Berti",
"Emanuele",
""
]
] | Black-hole spectroscopy is arguably the most promising tool to test gravity in extreme regimes and to probe the ultimate nature of black holes with unparalleled precision. These tests are currently limited by the lack of a ringdown parametrization that is both robust and accurate. We develop an observable-based paramet... |
1206.5509 | Vladimir Khatsymovsky | V.M. Khatsymovsky | On area spectrum in the Faddeev gravity | 17 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider Faddeev formulation of gravity, in which the metric is bilinear
of $d = 10$ 4-vector fields. A unique feature of this formulation is that the
action remains finite for the discontinuous fields (although continuity is
recovered on the equations of motion). This means that the spacetime can be
decomposed in... | [
{
"created": "Sun, 24 Jun 2012 15:40:03 GMT",
"version": "v1"
}
] | 2012-06-26 | [
[
"Khatsymovsky",
"V. M.",
""
]
] | We consider Faddeev formulation of gravity, in which the metric is bilinear of $d = 10$ 4-vector fields. A unique feature of this formulation is that the action remains finite for the discontinuous fields (although continuity is recovered on the equations of motion). This means that the spacetime can be decomposed into... |
1508.03246 | Wenliang Li | Wenliang Li | Novel nonlinear kinetic terms for gravitons | 19 pages, two columns, v3.1; a reference is added | Phys. Rev. D 94, 064078 (2016) | 10.1103/PhysRevD.94.064078 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A set of novel derivative terms for spin-2 fields are proposed. They are the
wedge products of curvature two-forms and vielbeins. In this work, we
investigate the properties of novel two-derivative terms in the context of
bi-gravity. Based on a minisuperspace analysis, we identify a large class of
bi-gravity models w... | [
{
"created": "Thu, 13 Aug 2015 15:22:08 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Nov 2015 00:57:24 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Jul 2016 17:38:21 GMT",
"version": "v3"
},
{
"created": "Thu, 19 Oct 2017 03:12:31 GMT",
"version": "v4"
}
] | 2017-10-20 | [
[
"Li",
"Wenliang",
""
]
] | A set of novel derivative terms for spin-2 fields are proposed. They are the wedge products of curvature two-forms and vielbeins. In this work, we investigate the properties of novel two-derivative terms in the context of bi-gravity. Based on a minisuperspace analysis, we identify a large class of bi-gravity models whe... |
2002.00221 | Roberto Casadio | R. Casadio, M. Lenzi, A. Ciarfella | Quantum black holes in bootstrapped Newtonian gravity | LaTeX, 27 pages, 6 figures, clarifications added, to appear in PRD | Phys. Rev. D 101, 124032 (2020) | 10.1103/PhysRevD.101.124032 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse the classical configurations of a bootstrapped Newtonian potential
generated by homogeneous spherically symmetric sources in terms of a quantum
coherent state. We first compute how the mass and mean wavelength of these
solutions scale in terms of the number of quanta in the coherent state. We then
note tha... | [
{
"created": "Sat, 1 Feb 2020 14:36:39 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Jun 2020 21:10:48 GMT",
"version": "v2"
}
] | 2020-07-01 | [
[
"Casadio",
"R.",
""
],
[
"Lenzi",
"M.",
""
],
[
"Ciarfella",
"A.",
""
]
] | We analyse the classical configurations of a bootstrapped Newtonian potential generated by homogeneous spherically symmetric sources in terms of a quantum coherent state. We first compute how the mass and mean wavelength of these solutions scale in terms of the number of quanta in the coherent state. We then note that ... |
0801.1686 | Arturo Avelino Huerta | Arturo Avelino, U. Nucamendi and F. S. Guzm\'an (Instituto de F\'isica
y Matem\'aticas, Universidad Michoacana de San Nicol\'as de Hidalgo, Morelia,
Michoac\'an, M\'exico) | Constraining a bulk viscous matter-dominated cosmological model using
SNe Ia, CMB and LSS | 4 pages, 1 figure. Work presented in the XI Mexican Workshop on
Particles and Fields, Tuxtla Gutierrez, Mexico, nov 7-12, 2007. Submitted to
AIP Conference Proceedings of this conference | AIP Conf.Proc.1026:300-302,2008 | 10.1063/1.2965067 | null | gr-qc astro-ph | null | We present and constrain a cosmological model which component is a
pressureless fluid with bulk viscosity as an explanation for the present
accelerated expansion of the universe. We study the particular model of a
constant bulk viscosity coefficient \zeta_m. The possible values of \zeta_m are
constrained using the co... | [
{
"created": "Thu, 10 Jan 2008 21:26:07 GMT",
"version": "v1"
}
] | 2009-03-24 | [
[
"Avelino",
"Arturo",
"",
"Instituto de Física\n y Matemáticas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia,\n Michoacán, México"
],
[
"Nucamendi",
"U.",
"",
"Instituto de Física\n y Matemáticas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia,\n Mich... | We present and constrain a cosmological model which component is a pressureless fluid with bulk viscosity as an explanation for the present accelerated expansion of the universe. We study the particular model of a constant bulk viscosity coefficient \zeta_m. The possible values of \zeta_m are constrained using the cosm... |
gr-qc/0501013 | Roberto Giambo' | Roberto Giamb\'o | Gravitational collapse of homogeneous scalar fields | LaTeX2e; revised version | Class.Quant.Grav.22:2295-2305,2005 | 10.1088/0264-9381/22/11/023 | null | gr-qc | null | Conditions under which gravity coupled to self interacting scalar field
determines singularity formation are found and discussed. It is shown that,
under a suitable matching with an external space, the boundary, if collapses
completely, may give rise to a naked singularity. Issues related to the
strength of the singu... | [
{
"created": "Wed, 5 Jan 2005 17:52:32 GMT",
"version": "v1"
},
{
"created": "Fri, 27 May 2005 14:54:05 GMT",
"version": "v2"
}
] | 2010-11-05 | [
[
"Giambó",
"Roberto",
""
]
] | Conditions under which gravity coupled to self interacting scalar field determines singularity formation are found and discussed. It is shown that, under a suitable matching with an external space, the boundary, if collapses completely, may give rise to a naked singularity. Issues related to the strength of the singula... |
2005.02688 | Jonathan Gratus | Jonathan Gratus, Paolo Pinto, Spyridon Talaganis | The Distributional Stress-Energy Quadrupole | 42 pages, 2 figures. Accepted by Classical and Quantum Gravity.
url=http://iopscience.iop.org/article/10.1088/1361-6382/abccde | null | 10.1088/1361-6382/abccde | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate stress-energy tensors constructed from the delta function on a
worldline. We concentrate on quadrupoles as they make an excellent model for
the dominant source of gravitational waves and have significant novel features.
Unlike the dipole, we show that the quadrupole has 20 free components which are
not... | [
{
"created": "Wed, 6 May 2020 09:51:59 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Nov 2020 09:36:19 GMT",
"version": "v2"
}
] | 2020-11-26 | [
[
"Gratus",
"Jonathan",
""
],
[
"Pinto",
"Paolo",
""
],
[
"Talaganis",
"Spyridon",
""
]
] | We investigate stress-energy tensors constructed from the delta function on a worldline. We concentrate on quadrupoles as they make an excellent model for the dominant source of gravitational waves and have significant novel features. Unlike the dipole, we show that the quadrupole has 20 free components which are not d... |
0809.2678 | Ali Reza Amani | J. Sadeghi and A.R. Amani | The solution of tachyon inflation in curved universe | 8 pages, 21 figures | Int.J.Theor.Phys.48:14-21,2009 | 10.1007/s10773-008-9776-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we have considered the curved universe which is filled by
tachyonic field. We have found the exact solutions for the field, pressure,
density, and scale factor and some cosmological parameters. In such universe,
we have investigated the role of tachyonic field in different stages of k for
the evolution... | [
{
"created": "Tue, 16 Sep 2008 10:59:53 GMT",
"version": "v1"
}
] | 2009-02-19 | [
[
"Sadeghi",
"J.",
""
],
[
"Amani",
"A. R.",
""
]
] | In this paper, we have considered the curved universe which is filled by tachyonic field. We have found the exact solutions for the field, pressure, density, and scale factor and some cosmological parameters. In such universe, we have investigated the role of tachyonic field in different stages of k for the evolution o... |
2304.08171 | Piotr Jaranowski | Andrzej Kr\'olak, Piotr Jaranowski, Micha{\l} Bejger, Pawe{\l}
Cieciel\k{a}g, Orest Dorosh, Andrzej Pisarski | Search for Postmerger Gravitational Waves from Binary Neutron Star
Mergers Using a Matched-filtering Statistic | LaTeX, 30 pages, 15 figures, identical to the published version | Class. Quantum Grav. 40, 215008 (2023) | 10.1088/1361-6382/acfa5d | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we present a new method to search for a short, a few tens of
milliseconds long, postmerger gravitational-wave signal following the merger of
two neutron stars. Such a signal could follow the event GW170817 observed by
LIGO and Virgo detectors. Our method is based on a matched filtering statistic
and an... | [
{
"created": "Mon, 17 Apr 2023 11:35:12 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Apr 2023 08:11:01 GMT",
"version": "v2"
},
{
"created": "Fri, 13 Oct 2023 09:22:48 GMT",
"version": "v3"
}
] | 2023-10-16 | [
[
"Królak",
"Andrzej",
""
],
[
"Jaranowski",
"Piotr",
""
],
[
"Bejger",
"Michał",
""
],
[
"Ciecieląg",
"Paweł",
""
],
[
"Dorosh",
"Orest",
""
],
[
"Pisarski",
"Andrzej",
""
]
] | In this paper, we present a new method to search for a short, a few tens of milliseconds long, postmerger gravitational-wave signal following the merger of two neutron stars. Such a signal could follow the event GW170817 observed by LIGO and Virgo detectors. Our method is based on a matched filtering statistic and an a... |
gr-qc/0006038 | Ozay Gurtug | Ozay Gurtug and Mustafa Halilsoy | Horizon Instability in the Cross Polarized Bell-Szekeres Spacetime | Latex file, 26 pages, 1 ps figure | null | null | null | gr-qc | null | The quasiregular singularities (horizons) that form in the collision of cross
polarized electromagnetic waves are, as in the linear polarized case unstable.
The validity of the Helliwell-Konkowski stability conjecture is tested for a
number of exact back-reaction cases. In the test electromagnetic case the
conjecture... | [
{
"created": "Mon, 12 Jun 2000 11:44:44 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gurtug",
"Ozay",
""
],
[
"Halilsoy",
"Mustafa",
""
]
] | The quasiregular singularities (horizons) that form in the collision of cross polarized electromagnetic waves are, as in the linear polarized case unstable. The validity of the Helliwell-Konkowski stability conjecture is tested for a number of exact back-reaction cases. In the test electromagnetic case the conjecture f... |
gr-qc/0609117 | Clovis Jacinto de Matos | Clovis Jacinto de Matos | Generation of Closed Timelike Curves with Rotating Superconductors | 9 pages. Submitted to Classical and Quantum Gravity | Class.Quant.Grav.24:1693-1698,2007 | 10.1088/0264-9381/24/7/001 | null | gr-qc | null | The spacetime metric around a rotating SuperConductive Ring (SCR) is deduced
from the gravitomagnetic London moment in rotating superconductors. It is shown
that theoretically it is possible to generate Closed Timelike Curves (CTC) with
rotating SCRs. The possibility to use these CTC's to travel in time as
initially ... | [
{
"created": "Tue, 26 Sep 2006 08:13:42 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Dec 2006 13:44:46 GMT",
"version": "v2"
},
{
"created": "Fri, 19 Jan 2007 16:50:40 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"de Matos",
"Clovis Jacinto",
""
]
] | The spacetime metric around a rotating SuperConductive Ring (SCR) is deduced from the gravitomagnetic London moment in rotating superconductors. It is shown that theoretically it is possible to generate Closed Timelike Curves (CTC) with rotating SCRs. The possibility to use these CTC's to travel in time as initially id... |
1808.04570 | Alexander Agathonov | Yurii Ignat'ev, Alexander Agathonov, Irina Kokh | The Peculiarities of the Cosmological Models Based on Non-Linear
Classical and Phantom Fields with Minimal Interaction. I. The Cosmological
Model Based on Scalar Singlet | 17 pages, 24 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | A detailed comparative qualitative analysis and numerical simulation of
evolution of the cosmological models based on classical and phantom scalar
fields with self-action was performed. The phase portraits of the dynamic
systems of classical and phantom fields and their projections to the Poincare
sphere were constru... | [
{
"created": "Tue, 14 Aug 2018 07:57:15 GMT",
"version": "v1"
}
] | 2018-08-15 | [
[
"Ignat'ev",
"Yurii",
""
],
[
"Agathonov",
"Alexander",
""
],
[
"Kokh",
"Irina",
""
]
] | A detailed comparative qualitative analysis and numerical simulation of evolution of the cosmological models based on classical and phantom scalar fields with self-action was performed. The phase portraits of the dynamic systems of classical and phantom fields and their projections to the Poincare sphere were construct... |
0905.3655 | M. D. Maia | M. D. Maia, A. J. S.Capistrano and E. M. Monte | On the Nature of the Cosmological Constant Problem | LaTex, 5 pages no figutres. Correction on author list | Int.J.Mod.Phys.A24:1545-1548,2009 | 10.1142/S0217751X09044978 | null | gr-qc astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | General relativity postulates the Minkowski space-time to be the standard
flat geometry against which we compare all curved space-times and the
gravitational ground state where particles, quantum fields and their vacuum
states are primarily conceived. On the other hand, experimental evidences show
that there exists a... | [
{
"created": "Fri, 22 May 2009 10:32:06 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Jun 2009 00:18:18 GMT",
"version": "v2"
}
] | 2015-05-13 | [
[
"Maia",
"M. D.",
""
],
[
"Capistrano",
"A. J. S.",
""
],
[
"Monte",
"E. M.",
""
]
] | General relativity postulates the Minkowski space-time to be the standard flat geometry against which we compare all curved space-times and the gravitational ground state where particles, quantum fields and their vacuum states are primarily conceived. On the other hand, experimental evidences show that there exists a n... |
2407.13793 | Faizuddin Ahmed | Jaydeep Goswami, Hafizur Rahman, Rimi Sikdar, Rina Parvin and
Faizuddin Ahmed | Morris-Thorne-type Wormhole with Global Monopole Charge and the Energy
Conditions | 31 pages, 27 figures, 2 tables. arXiv admin note: text overlap with
arXiv:1907.06726 by other authors | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this paper, we investigate topologically charged Morris-Thorne-type
wormholes using various shape function forms. We solve the Einstein field
equations incorporating an anisotropic energy-momentum tensor and obtain
different physical quantities associated with the matter content. A crucial
aspect of this study is ... | [
{
"created": "Tue, 16 Jul 2024 08:08:26 GMT",
"version": "v1"
}
] | 2024-07-22 | [
[
"Goswami",
"Jaydeep",
""
],
[
"Rahman",
"Hafizur",
""
],
[
"Sikdar",
"Rimi",
""
],
[
"Parvin",
"Rina",
""
],
[
"Ahmed",
"Faizuddin",
""
]
] | In this paper, we investigate topologically charged Morris-Thorne-type wormholes using various shape function forms. We solve the Einstein field equations incorporating an anisotropic energy-momentum tensor and obtain different physical quantities associated with the matter content. A crucial aspect of this study is th... |
gr-qc/9910026 | Gaetano Lambiase | S. Capozziello, G. Lambiase | Neutrino Oscillations in Brans-Dicke Theory of Gravity | 9 pages, LATEX file, to appear in Mod. Phys. Lett. A | Mod.Phys.Lett.A14:2193,1999 | 10.1142/S0217732399002261 | null | gr-qc | null | Flavor oscillations of neutrinos are analyzed in the framework of Brans-Dicke
theory of gravity. We find a shift of quantum mechanical phase of neutrino
proportional to $G_N\Delta m^2$ and depending on the parameter $\omega$.
Consequences on atmospheric, solar and astrophysical neutrinos are discussed.
| [
{
"created": "Thu, 7 Oct 1999 14:25:48 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Capozziello",
"S.",
""
],
[
"Lambiase",
"G.",
""
]
] | Flavor oscillations of neutrinos are analyzed in the framework of Brans-Dicke theory of gravity. We find a shift of quantum mechanical phase of neutrino proportional to $G_N\Delta m^2$ and depending on the parameter $\omega$. Consequences on atmospheric, solar and astrophysical neutrinos are discussed. |
1708.08176 | Shao-Wen Wei | Shao-Wen Wei, Yu-Xiao Liu | Charged AdS black hole heat engines | 14 pages, 17 figures, 1 table | Nucl. Phys. B 946, 114700 (2019) | 10.1016/j.nuclphysb.2019.114700 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the heat engine by a $d$-dimensional charged anti-de Sitter black
hole by making a comparison between the small-large black hole phase transition
and the liquid-vapour phase transition of water. With the help of the first law
and equal-area law, we obtain an exact formula for the efficiency of a black
hole e... | [
{
"created": "Mon, 28 Aug 2017 03:46:02 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Aug 2019 08:40:22 GMT",
"version": "v2"
}
] | 2019-08-20 | [
[
"Wei",
"Shao-Wen",
""
],
[
"Liu",
"Yu-Xiao",
""
]
] | We study the heat engine by a $d$-dimensional charged anti-de Sitter black hole by making a comparison between the small-large black hole phase transition and the liquid-vapour phase transition of water. With the help of the first law and equal-area law, we obtain an exact formula for the efficiency of a black hole eng... |
gr-qc/0407038 | Paul S. Wesson | Paul S. Wesson | Vacuum Instability | null | Found.Phys.Lett. 19 (2006) 285-291 | null | null | gr-qc | null | Following fresh attempts to resolve the problem of the energy density of the
vacuum, we reconsider the case where the cosmological constant is derived from
a higher-dimensional version of general relativity, and interpret the
gauge-dependence of $\Lambda $ as a dynamical effect. This leads to a relation
between the c... | [
{
"created": "Fri, 9 Jul 2004 23:32:10 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Mar 2005 03:46:10 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Wesson",
"Paul S.",
""
]
] | Following fresh attempts to resolve the problem of the energy density of the vacuum, we reconsider the case where the cosmological constant is derived from a higher-dimensional version of general relativity, and interpret the gauge-dependence of $\Lambda $ as a dynamical effect. This leads to a relation between the cha... |
2005.02611 | Alexander Pavlov E | Alexander E. Pavlov | EoS of Casimir vacuum of massive fields in Friedmann Universe | 7 pages, 4 figures | null | 10.1142/S0217732320502715 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present paper we study equations of state of Casimir vacuum of massive
scalar field and massive bispinor field in compact Friedmann Universe. With use
of the Abel-Plana formula the renormalization of divergent series for
calculation of the quantum means of operators is implemented.
| [
{
"created": "Wed, 6 May 2020 06:37:57 GMT",
"version": "v1"
}
] | 2020-12-02 | [
[
"Pavlov",
"Alexander E.",
""
]
] | In the present paper we study equations of state of Casimir vacuum of massive scalar field and massive bispinor field in compact Friedmann Universe. With use of the Abel-Plana formula the renormalization of divergent series for calculation of the quantum means of operators is implemented. |
2404.14536 | Nils Siemonsen | Nils Siemonsen | Nonlinear treatment of a black hole mimicker ringdown | 5+9 pages, 4+7 figures, updated to match published version | Phys. Rev. Lett. 133, 031401 (2024) | 10.1103/PhysRevLett.133.031401 | null | gr-qc hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We perform the first nonlinear and self-consistent study of the merger and
ringdown of a black hole mimicking object with stable light rings. To that end,
we numerically solve the full Einstein-Klein-Gordon equations governing the
head-on collisions of a series of binary boson stars in the large-mass-ratio
regime res... | [
{
"created": "Mon, 22 Apr 2024 19:07:54 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Jul 2024 07:25:38 GMT",
"version": "v2"
}
] | 2024-07-23 | [
[
"Siemonsen",
"Nils",
""
]
] | We perform the first nonlinear and self-consistent study of the merger and ringdown of a black hole mimicking object with stable light rings. To that end, we numerically solve the full Einstein-Klein-Gordon equations governing the head-on collisions of a series of binary boson stars in the large-mass-ratio regime resul... |
1712.05068 | Yilin Chen | Yilin Chen, Jin Wang | A new inflationary Universe scenario with inhomogeneous quantum vacuum | 16 pages, 9 figures | null | 10.1155/2018/3916727 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the quantum vacuum and find the fluctuations can lead to the
inhomogeneous quantum vacuum. We find that the vacuum fluctuations can
significantly influence the cosmological inhomogeneity, which is different from
what previously expected. By introducing the modified Green's function, we
reach a new infl... | [
{
"created": "Thu, 14 Dec 2017 01:47:46 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Feb 2018 10:53:22 GMT",
"version": "v2"
}
] | 2021-04-14 | [
[
"Chen",
"Yilin",
""
],
[
"Wang",
"Jin",
""
]
] | We investigate the quantum vacuum and find the fluctuations can lead to the inhomogeneous quantum vacuum. We find that the vacuum fluctuations can significantly influence the cosmological inhomogeneity, which is different from what previously expected. By introducing the modified Green's function, we reach a new inflat... |
0711.0006 | Tanmay Vachaspati | Tanmay Vachaspati | Schrodinger Picture of Quantum Gravitational Collapse | 9 pages, 1 figure. Matches published version | Class.Quant.Grav.26:215007,2009 | 10.1088/0264-9381/26/21/215007 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The functional Schrodinger equation is used to study the quantum collapse of
a gravitating, spherical domain wall and a massless scalar field coupled to the
metric. The approach includes backreaction of pre-Hawking radiation on the
gravitational collapse. Truncating the degrees of freedom to a minisuperspace
leads to... | [
{
"created": "Wed, 31 Oct 2007 20:08:05 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Oct 2009 02:14:32 GMT",
"version": "v2"
}
] | 2014-11-18 | [
[
"Vachaspati",
"Tanmay",
""
]
] | The functional Schrodinger equation is used to study the quantum collapse of a gravitating, spherical domain wall and a massless scalar field coupled to the metric. The approach includes backreaction of pre-Hawking radiation on the gravitational collapse. Truncating the degrees of freedom to a minisuperspace leads to a... |
gr-qc/0111099 | Marcelo S. Berman | Marcelo S. Berman and Luis A. Trevisan | Static Generalized Brans-Dicke Universe and Gravitational Waves
Amplification | Submitted to Physics Letters A. Date of receipt 01 October 2001 | null | null | null | gr-qc | null | We find a static solution for the scale-factor in a Brans-Dicke generalized
theory where the scalar field and the coupling constant vary with time. We find
also that in the early Universe there may be amplification of gravitational
waves.
| [
{
"created": "Wed, 28 Nov 2001 16:47:43 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Berman",
"Marcelo S.",
""
],
[
"Trevisan",
"Luis A.",
""
]
] | We find a static solution for the scale-factor in a Brans-Dicke generalized theory where the scalar field and the coupling constant vary with time. We find also that in the early Universe there may be amplification of gravitational waves. |
gr-qc/9801098 | Ronggen Cai | Rong-Gen Cai | Propagation of vacuum polarized photons in topological black hole
spacetimes | 18 pages, Revtex, no figures | Nucl.Phys. B524 (1998) 639-657 | 10.1016/S0550-3213(98)00274-0 | SNUTP 97-165 | gr-qc | null | The one-loop effective action for QED in curved spacetime contains
equivalence principle violating interactions between the electromagnetic field
and the spacetime curvature. These interactions lead to the dependence of
photon velocity on the motion and polarization directions. In this paper we
investigate the gravit... | [
{
"created": "Thu, 29 Jan 1998 07:06:34 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Jul 1998 08:23:55 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Cai",
"Rong-Gen",
""
]
] | The one-loop effective action for QED in curved spacetime contains equivalence principle violating interactions between the electromagnetic field and the spacetime curvature. These interactions lead to the dependence of photon velocity on the motion and polarization directions. In this paper we investigate the gravitat... |
1004.3191 | Nihan Katirci Ayse | Metin Ar{\i}k, Mehmet Cal{\i}k, and N. Katirci | A Cosmological Exact Solution of Complex Jordan-Brans-Dicke Theory and
its Phenomenological Implications | 4 pages, 1 figure | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When Brans-Dicke Theory is formulated in terms of the Jordan scalar field
\phi, dark energy is related to the mass of this field. We show that if \phi is
taken to be a complex scalar field then an exact solution of the vacuum
equations shows that Friedmann equation possesses a term, proportional to the
inverse sixth ... | [
{
"created": "Mon, 19 Apr 2010 13:35:43 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Aug 2010 11:52:00 GMT",
"version": "v2"
},
{
"created": "Mon, 4 Oct 2010 11:39:30 GMT",
"version": "v3"
},
{
"created": "Wed, 15 Dec 2010 11:54:16 GMT",
"version": "v4"
}
] | 2015-03-14 | [
[
"Arık",
"Metin",
""
],
[
"Calık",
"Mehmet",
""
],
[
"Katirci",
"N.",
""
]
] | When Brans-Dicke Theory is formulated in terms of the Jordan scalar field \phi, dark energy is related to the mass of this field. We show that if \phi is taken to be a complex scalar field then an exact solution of the vacuum equations shows that Friedmann equation possesses a term, proportional to the inverse sixth po... |
2309.05599 | Matteo Luca Ruggiero | Matteo Luca Ruggiero | A note on the description of plane gravitational waves in Fermi
coordinates | 15 pages. arXiv admin note: text overlap with arXiv:2204.08914 | Eur. Phys. J. Plus (2023) 138:792 | 10.1140/epjp/s13360-023-04424-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the formalism of Fermi coordinates to describe the interaction of a
plane gravitational wave in the proper detector frame. In doing so, we
emphasize that in this frame the action of the gravitational wave can be
explained in terms of a gravitoelectromagnetic analogy. In particular, up to
linear displacements f... | [
{
"created": "Mon, 11 Sep 2023 16:26:20 GMT",
"version": "v1"
}
] | 2023-09-12 | [
[
"Ruggiero",
"Matteo Luca",
""
]
] | We use the formalism of Fermi coordinates to describe the interaction of a plane gravitational wave in the proper detector frame. In doing so, we emphasize that in this frame the action of the gravitational wave can be explained in terms of a gravitoelectromagnetic analogy. In particular, up to linear displacements fro... |
0804.3824 | Hiroyuki Nakano | Carlos O. Lousto, Hiroyuki Nakano (RIT) | Regular second order perturbations of binary black holes: The extreme
mass ratio regime | 28 pages, no figure | Class.Quant.Grav.26:015007,2009 | 10.1088/0264-9381/26/1/015007 | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In order to derive the precise gravitational waveforms for extreme mass ratio
inspirals (EMRI), we develop a formulation for the second order metric
perturbations produced by a point particle moving in the Schwarzschild
spacetime. The second order waveforms satisfy a wave equation with an effective
source build up fr... | [
{
"created": "Thu, 24 Apr 2008 01:29:23 GMT",
"version": "v1"
}
] | 2008-12-25 | [
[
"Lousto",
"Carlos O.",
"",
"RIT"
],
[
"Nakano",
"Hiroyuki",
"",
"RIT"
]
] | In order to derive the precise gravitational waveforms for extreme mass ratio inspirals (EMRI), we develop a formulation for the second order metric perturbations produced by a point particle moving in the Schwarzschild spacetime. The second order waveforms satisfy a wave equation with an effective source build up from... |
gr-qc/9609020 | David Scialom | D. Scialom | Inflation with a Complex Scalar Field | latex file. Amstex package used. Contribution to the proceedings of
journees relativistes 96 | Helv.Phys.Acta 69:190-193,1996 | null | ZU-TH 25/96 | gr-qc hep-th | null | We discuss the coupled Einstein-Klein-Gordon equations for a complex scalar
field with and without a quartic self-interaction in a zero curvature
Friedman-Lema\^{\i}tre Universe. The complex scalar field, as well as the
metric, is decomposed in a homogeneous, isotropic part (the background) and in
first order gauge i... | [
{
"created": "Mon, 9 Sep 1996 08:52:03 GMT",
"version": "v1"
}
] | 2011-04-15 | [
[
"Scialom",
"D.",
""
]
] | We discuss the coupled Einstein-Klein-Gordon equations for a complex scalar field with and without a quartic self-interaction in a zero curvature Friedman-Lema\^{\i}tre Universe. The complex scalar field, as well as the metric, is decomposed in a homogeneous, isotropic part (the background) and in first order gauge inv... |
gr-qc/9405027 | Guillermo Mena | Guillermo A Mena Marugan | Wormholes as Basis for the Hilbert Space in Lorentzian Gravity | 23 pages (Latex), Preprint IMAFF-RC-04-94, CGPG-94/5-2 | Phys.Rev.D50:3923-3931,1994 | 10.1103/PhysRevD.50.3923 | null | gr-qc | null | We carry out to completion the quantization of a Friedmann-Robertson-Walker
model provided with a conformal scalar field, and of a Kantowski-Sachs
spacetime minimally coupled to a massless scalar field. We prove that the
Hilbert space determined by the reality conditions that correspond to
Lorentzian gravity admits a... | [
{
"created": "Tue, 10 May 1994 21:33:59 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Marugan",
"Guillermo A Mena",
""
]
] | We carry out to completion the quantization of a Friedmann-Robertson-Walker model provided with a conformal scalar field, and of a Kantowski-Sachs spacetime minimally coupled to a massless scalar field. We prove that the Hilbert space determined by the reality conditions that correspond to Lorentzian gravity admits a b... |
2306.15484 | Aleksandar Mikovic | Aleksandar Mikovic | Finiteness of quantum gravity with matter on a PL spacetime | 30 pages | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We study the convergence of the path integral for General Relativity with
matter on a picewise linear (PL) spacetime that corresponds to a triangulation
of a smooth manifold by using a path-integral measure that renders the pure
gravity path integral finite. This measure depends on a parameter p, and in the
case when... | [
{
"created": "Tue, 27 Jun 2023 14:03:56 GMT",
"version": "v1"
}
] | 2023-06-28 | [
[
"Mikovic",
"Aleksandar",
""
]
] | We study the convergence of the path integral for General Relativity with matter on a picewise linear (PL) spacetime that corresponds to a triangulation of a smooth manifold by using a path-integral measure that renders the pure gravity path integral finite. This measure depends on a parameter p, and in the case when t... |
0810.2575 | Gonzalo Garc\'ia-Reyes | Gonzalo Garc\'ia-Reyes and Guillermo A. Gonz\'alez | Charged perfect fluid disks as sources of Taub-NUT-type spacetimes | 6 pages, Revtex4 | Phys. Rev. D, 70, 104005 (2004) | 10.1103/PhysRevD.70.104005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The interpretation of a family of electrovacuum stationary Taub-NUT-type
fields in terms of finite charged perfect fluid disks is presented. The
interpretation is mades by means of an "inverse problem" approach used to
obtain disk sources of known solutions of the Einstein or Einstein-Maxwell
equations. The diagonali... | [
{
"created": "Tue, 14 Oct 2008 22:57:14 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"García-Reyes",
"Gonzalo",
""
],
[
"González",
"Guillermo A.",
""
]
] | The interpretation of a family of electrovacuum stationary Taub-NUT-type fields in terms of finite charged perfect fluid disks is presented. The interpretation is mades by means of an "inverse problem" approach used to obtain disk sources of known solutions of the Einstein or Einstein-Maxwell equations. The diagonaliza... |
gr-qc/0005065 | Alicia M. Sintes | A.M. Sintes, J. Carot | Perfect fluid space-times admitting a 3-dimensional conformal group
acting on null orbits | Latex 4 pages. Published in: "Some topics on General Relativity and
Gravitational Radiation". Edts. J.A. Mirales, J.A. Morales, and D. Saez;
Editions Frontiers. pp. 297-300 (1997) | null | null | null | gr-qc | null | Space-times admitting a 3-dimensional Lie group of conformal motions $C_3$
acting on null orbits are studied. Coordinate expressions for the metric and
the conformal Killing vectors (CKV) are then provided (irrespectively of the
matter content) and all possible perfect fluid solutions are found, although
none of them... | [
{
"created": "Tue, 16 May 2000 14:46:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sintes",
"A. M.",
""
],
[
"Carot",
"J.",
""
]
] | Space-times admitting a 3-dimensional Lie group of conformal motions $C_3$ acting on null orbits are studied. Coordinate expressions for the metric and the conformal Killing vectors (CKV) are then provided (irrespectively of the matter content) and all possible perfect fluid solutions are found, although none of them v... |
1805.02318 | Gabriele Gionti S.J. | S.J. Gabriele Gionti | Hamiltonian Analysis of Asymptotically Safe Gravity | 15 pages, 1 figure, proceeding of the Corf\`u Summer Workshop
"Testing Fundamental Physics Principles", Corfu, Greece, September 22-28 2017 | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent results based on renormalization group approaches to Quantum Gravity
suggest that the Newton's and cosmological constants should be treated as
dynamical variables whose evolution depend on the characteristic energy scale
of the system. An open question is how to embed this modified Einstein's theory
in the Dir... | [
{
"created": "Mon, 7 May 2018 02:19:27 GMT",
"version": "v1"
}
] | 2018-05-08 | [
[
"Gionti",
"S. J. Gabriele",
""
]
] | Recent results based on renormalization group approaches to Quantum Gravity suggest that the Newton's and cosmological constants should be treated as dynamical variables whose evolution depend on the characteristic energy scale of the system. An open question is how to embed this modified Einstein's theory in the Dirac... |
2103.12430 | Sumanta Chakraborty | Sumanta Chakraborty, Sayak Datta, and Subhadip Sau | Tidal heating of black holes and exotic compact objects on the brane | Published version, 46 pages, 7 figures | Physical Review D 104, 104001 (2021) | 10.1103/PhysRevD.104.104001 | LIGO-P2100094 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | During the early phase of in-spiral of a binary system, the tidal heating of
a compact object due to its companion plays a significant role in the
determination of the orbital evolution of the binary. The phenomenon depends
crucially on the `hairs', as well as on the nature of the compact object. It
turns out that th... | [
{
"created": "Tue, 23 Mar 2021 10:14:35 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jul 2021 06:42:37 GMT",
"version": "v2"
},
{
"created": "Tue, 9 Nov 2021 02:09:19 GMT",
"version": "v3"
}
] | 2021-11-10 | [
[
"Chakraborty",
"Sumanta",
""
],
[
"Datta",
"Sayak",
""
],
[
"Sau",
"Subhadip",
""
]
] | During the early phase of in-spiral of a binary system, the tidal heating of a compact object due to its companion plays a significant role in the determination of the orbital evolution of the binary. The phenomenon depends crucially on the `hairs', as well as on the nature of the compact object. It turns out that the ... |
1703.09696 | Marina Cort\^es | Marina Cort\^es and Lee Smolin | Reversing the irreversible: from limit cycles to emergent time symmetry | 22 pages, 8 figures | Phys. Rev. D 97, 026004 (2018) | 10.1103/PhysRevD.97.026004 | null | gr-qc astro-ph.CO nlin.AO physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In 1979 Penrose hypothesized that the arrows of time are explained by the
hypothesis that the fundamental laws are time irreversible. That is, our
reversible laws, such as the standard model and general relativity are
effective, and emerge from an underlying fundamental theory which is time
irreversible. In Cort\^{e}... | [
{
"created": "Mon, 27 Mar 2017 18:00:10 GMT",
"version": "v1"
}
] | 2018-01-17 | [
[
"Cortês",
"Marina",
""
],
[
"Smolin",
"Lee",
""
]
] | In 1979 Penrose hypothesized that the arrows of time are explained by the hypothesis that the fundamental laws are time irreversible. That is, our reversible laws, such as the standard model and general relativity are effective, and emerge from an underlying fundamental theory which is time irreversible. In Cort\^{e}s ... |
0805.3096 | Henning Rehbein | Henning Rehbein, Helge Mueller-Ebhardt, Kentaro Somiya, Stefan L.
Danilishin, Roman Schnabel, Karsten Danzmann and Yanbei Chen | Double optical spring enhancement for gravitational wave detectors | null | Phys.Rev.D78:062003,2008 | 10.1103/PhysRevD.78.062003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Currently planned second-generation gravitational-wave laser interferometers
such as Advanced LIGO exploit the extensively investigated signal-recycling
(SR) technique. Candidate Advanced LIGO configurations are usually designed to
have two resonances within the detection band, around which the sensitivity is
enhance... | [
{
"created": "Tue, 20 May 2008 15:03:26 GMT",
"version": "v1"
}
] | 2009-02-23 | [
[
"Rehbein",
"Henning",
""
],
[
"Mueller-Ebhardt",
"Helge",
""
],
[
"Somiya",
"Kentaro",
""
],
[
"Danilishin",
"Stefan L.",
""
],
[
"Schnabel",
"Roman",
""
],
[
"Danzmann",
"Karsten",
""
],
[
"Chen",
"Yanbei",
... | Currently planned second-generation gravitational-wave laser interferometers such as Advanced LIGO exploit the extensively investigated signal-recycling (SR) technique. Candidate Advanced LIGO configurations are usually designed to have two resonances within the detection band, around which the sensitivity is enhanced:... |
2307.13039 | M Herrero-Valea | M. Herrero-Valea | The Status of Horava Gravity | Invited review for the EPJP special issue on Higher Derivatives in
Quantum Gravity. 49 pages, 2 figures. Comments are welcome | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Horava gravity is a proposal for a UV completion of gravitation obtained by
endowing the space-time manifold with a preferred foliation in space-like
hypersurfaces. This allows for a power-counting renormalizable theory free of
ghosts, at the cost of breaking local Lorentz invariance and diffeomorphism
invariance dow... | [
{
"created": "Mon, 24 Jul 2023 18:00:05 GMT",
"version": "v1"
}
] | 2023-07-26 | [
[
"Herrero-Valea",
"M.",
""
]
] | Horava gravity is a proposal for a UV completion of gravitation obtained by endowing the space-time manifold with a preferred foliation in space-like hypersurfaces. This allows for a power-counting renormalizable theory free of ghosts, at the cost of breaking local Lorentz invariance and diffeomorphism invariance down ... |
gr-qc/9902029 | Takeshi Shimomura | T. Shimomura, T. Okamura, T. Mishima and H. Ishihara | Does the generalized second law hold in the form of time derivative
expression? | 12 pages, 3 figures, revtex | Phys.Rev. D62 (2000) 044036; Addendum-ibid. D65 (2002) 107502 | 10.1103/PhysRevD.62.044036 | null | gr-qc | null | We investigate whether the generalized second law is valid, using two
dimensional black hole spacetime, irrespective of models. A time derivative
form of the generalized second law is formulated and it is shown that the law
might become invalid. The way to resolve this difficulty is also presented and
discussed.
| [
{
"created": "Thu, 11 Feb 1999 07:53:16 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Shimomura",
"T.",
""
],
[
"Okamura",
"T.",
""
],
[
"Mishima",
"T.",
""
],
[
"Ishihara",
"H.",
""
]
] | We investigate whether the generalized second law is valid, using two dimensional black hole spacetime, irrespective of models. A time derivative form of the generalized second law is formulated and it is shown that the law might become invalid. The way to resolve this difficulty is also presented and discussed. |
1111.5729 | Francisco Lobo | Remo Garattini, Francisco S.N. Lobo | Self-sustained wormholes in modified dispersion relations | 11 pages | Phys.Rev.D85:024043,2012 | 10.1103/PhysRevD.85.024043 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we consider the possibility that wormhole geometries are
sustained by their own quantum fluctuations, in the context of modified
dispersion relations. More specifically, the energy density of the graviton
one-loop contribution to a classical energy in a wormhole background is
considered as a self-consis... | [
{
"created": "Thu, 24 Nov 2011 11:32:45 GMT",
"version": "v1"
}
] | 2012-01-27 | [
[
"Garattini",
"Remo",
""
],
[
"Lobo",
"Francisco S. N.",
""
]
] | In this work, we consider the possibility that wormhole geometries are sustained by their own quantum fluctuations, in the context of modified dispersion relations. More specifically, the energy density of the graviton one-loop contribution to a classical energy in a wormhole background is considered as a self-consiste... |
gr-qc/0109036 | Alan Barnes | Alan Barnes | Some Restrictions on Symmetry Groups of Axially Symmetric Spacetimes | Plain TeX, 11 pages. No figures | Class.Quant.Grav. 18 (2001) 5511-5520 | 10.1088/0264-9381/18/24/313 | null | gr-qc | null | Lie transformation groups containing a one-dimensional subgroup acting
cyclically on a manifold are considered. The structure of the group is found to
be considerably restricted by the existence of a one-dimensional subgroup whose
orbits are circles. The results proved do not depend on the dimension of the
manifold n... | [
{
"created": "Tue, 11 Sep 2001 13:43:22 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Barnes",
"Alan",
""
]
] | Lie transformation groups containing a one-dimensional subgroup acting cyclically on a manifold are considered. The structure of the group is found to be considerably restricted by the existence of a one-dimensional subgroup whose orbits are circles. The results proved do not depend on the dimension of the manifold nor... |
1106.5056 | Clifford M. Will | Laleh Sadeghian and Clifford M. Will | Testing the black hole no-hair theorem at the galactic center:
Perturbing effects of stars in the surrounding cluster | 17 pages, 2 figures, submitted to Classical and Quantum Gravity | Class. Quantum Grav. 28, 225029 (2011) | 10.1088/0264-9381/28/22/225029 | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Observations of the precessing orbits of stars very near the massive black
hole in the galactic center could provide measurements of the spin and
quadrupole moment of the hole and thereby test the no-hair theorem of general
relativity. Since the galactic center is likely to be populated by a
distribution of stars and... | [
{
"created": "Fri, 24 Jun 2011 20:16:18 GMT",
"version": "v1"
}
] | 2011-11-04 | [
[
"Sadeghian",
"Laleh",
""
],
[
"Will",
"Clifford M.",
""
]
] | Observations of the precessing orbits of stars very near the massive black hole in the galactic center could provide measurements of the spin and quadrupole moment of the hole and thereby test the no-hair theorem of general relativity. Since the galactic center is likely to be populated by a distribution of stars and s... |
2306.16318 | Chandrachur Chakraborty | Chandrachur Chakraborty (MCNS-MAHE), Banibrata Mukhopadhyay (IISc) | Geometric phase in Taub-NUT spacetime | 12 pages; Version published in EPJC | Eur. Phys. J. C 83, 937 (2023) | 10.1140/epjc/s10052-023-12070-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Constructing the Hamiltonian in the $\eta$-representation, we explore the
geometric phase in the Taub-NUT spacetime, which is spherically symmetric and
stationary. The geometric phase around a non-rotating Taub-NUT spacetime
reveals both the gravitational analog of Aharonov-Bohm effect and
Pancharatnam-Berry phase, s... | [
{
"created": "Wed, 28 Jun 2023 15:50:51 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Oct 2023 04:48:35 GMT",
"version": "v2"
}
] | 2023-10-19 | [
[
"Chakraborty",
"Chandrachur",
"",
"MCNS-MAHE"
],
[
"Mukhopadhyay",
"Banibrata",
"",
"IISc"
]
] | Constructing the Hamiltonian in the $\eta$-representation, we explore the geometric phase in the Taub-NUT spacetime, which is spherically symmetric and stationary. The geometric phase around a non-rotating Taub-NUT spacetime reveals both the gravitational analog of Aharonov-Bohm effect and Pancharatnam-Berry phase, sim... |
2407.08588 | Swapan K Majhi | Swapan Kumar Majhi | Thermodynamics of rotating black hole in the presence of cold dark
matter | 12 pages, 16 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We have computed the thermodynamic properties of a rotating black holes in
the presence of cold dark matter. The dependence of temperaure, Gibbs free
energy, specific heat on the horizon radius have been studied for various
values of critical density (\r{ho}c ) of the cold dark matter. The studies
shows that only sma... | [
{
"created": "Thu, 11 Jul 2024 15:11:47 GMT",
"version": "v1"
}
] | 2024-07-12 | [
[
"Majhi",
"Swapan Kumar",
""
]
] | We have computed the thermodynamic properties of a rotating black holes in the presence of cold dark matter. The dependence of temperaure, Gibbs free energy, specific heat on the horizon radius have been studied for various values of critical density (\r{ho}c ) of the cold dark matter. The studies shows that only small... |
1503.04764 | David Garrison | David Garrison and Christopher Ramirez | Extracting Gravitational Waves Induced by Plasma Turbulence in the Early
Universe through an Averaging Process | 16 pages, 2 figures and 1 table | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work is a follow-up to the paper, "Numerical Relativity as a Tool for
Studying the Early Universe". In this article, we determine if cosmological
gravitational waves can be accurately extracted from a dynamical spacetime
using an averaging process as opposed to conventional methods of gravitational
wave extracti... | [
{
"created": "Mon, 16 Mar 2015 18:49:29 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Jun 2015 14:20:32 GMT",
"version": "v2"
},
{
"created": "Wed, 17 Jun 2015 01:04:02 GMT",
"version": "v3"
},
{
"created": "Mon, 15 Feb 2016 16:03:36 GMT",
"version": "v4"
},
{
"c... | 2017-04-24 | [
[
"Garrison",
"David",
""
],
[
"Ramirez",
"Christopher",
""
]
] | This work is a follow-up to the paper, "Numerical Relativity as a Tool for Studying the Early Universe". In this article, we determine if cosmological gravitational waves can be accurately extracted from a dynamical spacetime using an averaging process as opposed to conventional methods of gravitational wave extraction... |
0910.5376 | Kazumi Kashiyama | Kazumi Kashiyama, Norihiro Tanahashi, Antonino Flachi and Takahiro
Tanaka | Quantum Back Reaction to asymptotically AdS Black Holes | 13 pages, 10 figures | JHEP 1001:099,2010 | 10.1007/JHEP01(2010)099 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the effects of the back reaction due to a conformal field theory
(CFT) on a black hole spacetime with negative cosmological constant. We study
the geometry numerically obtained by taking into account the energy momentum
tensor of CFT approximated by a radiation fluid. We find a sequence of
configurations w... | [
{
"created": "Wed, 28 Oct 2009 14:35:31 GMT",
"version": "v1"
}
] | 2013-10-15 | [
[
"Kashiyama",
"Kazumi",
""
],
[
"Tanahashi",
"Norihiro",
""
],
[
"Flachi",
"Antonino",
""
],
[
"Tanaka",
"Takahiro",
""
]
] | We analyze the effects of the back reaction due to a conformal field theory (CFT) on a black hole spacetime with negative cosmological constant. We study the geometry numerically obtained by taking into account the energy momentum tensor of CFT approximated by a radiation fluid. We find a sequence of configurations wit... |
1805.11289 | Hassan Firouzjahi | Hassan Firouzjahi | The spectrum of perturbations inside the Schwarzschild black hole | 15 pages, 3 figures | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the spectrum of the bound state perturbations in the interior of the
Schwarzschild black hole for the scalar, electromagnetic and gravitational
perturbations. Demanding that the perturbations to be regular at the center of
the black hole determines the spectrum of the bound state solutions. We show
that our ... | [
{
"created": "Tue, 29 May 2018 08:04:15 GMT",
"version": "v1"
}
] | 2018-05-31 | [
[
"Firouzjahi",
"Hassan",
""
]
] | We study the spectrum of the bound state perturbations in the interior of the Schwarzschild black hole for the scalar, electromagnetic and gravitational perturbations. Demanding that the perturbations to be regular at the center of the black hole determines the spectrum of the bound state solutions. We show that our an... |
2305.18621 | Xiao Zhang | Yekun Yang, Xiao Zhang | Geodesics on metrics of Eguchi-Hanson type | 19 pages | null | 10.1140/epjc/s10052-023-11762-x | null | gr-qc math.DG | http://creativecommons.org/publicdomain/zero/1.0/ | Geodesic equations are solved when at least two of $\theta$, $\phi$ and
$\psi$ are constant, or $r$ is constant, on scalar flat metrics of
Eguchi-Hanson type. They can also be solved also on Eguchi-Hanson metrics which
are Ricci flat if only $\phi$ is constant. However, the explicit solution of
the geodesic equations... | [
{
"created": "Fri, 26 May 2023 04:50:49 GMT",
"version": "v1"
}
] | 2023-07-26 | [
[
"Yang",
"Yekun",
""
],
[
"Zhang",
"Xiao",
""
]
] | Geodesic equations are solved when at least two of $\theta$, $\phi$ and $\psi$ are constant, or $r$ is constant, on scalar flat metrics of Eguchi-Hanson type. They can also be solved also on Eguchi-Hanson metrics which are Ricci flat if only $\phi$ is constant. However, the explicit solution of the geodesic equations i... |
1206.2069 | Chen Songbai | Songbai Chen, Qiyuan Pan, Jiliang Jing | Holographic superconductors in quintessence AdS black hole | 19Page, 5 figures, Accepted by CQG | Class. Quantum Grav. 30 (2013) 145001 | 10.1088/0264-9381/30/14/145001 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a solution of Einstein equations describing a $d$-dimensional
planar quintessence AdS black hole which depends on the state parameter $w_q$
of quintessence. We investigate holographic superconductors in this background
and probe effects of the state parameter $w_q$ on the critical temperature
$T_c$, the co... | [
{
"created": "Sun, 10 Jun 2012 23:37:44 GMT",
"version": "v1"
},
{
"created": "Fri, 31 May 2013 02:46:54 GMT",
"version": "v2"
}
] | 2015-06-05 | [
[
"Chen",
"Songbai",
""
],
[
"Pan",
"Qiyuan",
""
],
[
"Jing",
"Jiliang",
""
]
] | We present a solution of Einstein equations describing a $d$-dimensional planar quintessence AdS black hole which depends on the state parameter $w_q$ of quintessence. We investigate holographic superconductors in this background and probe effects of the state parameter $w_q$ on the critical temperature $T_c$, the cond... |
1708.09505 | Gaurav Khanna | Caroline Mallary, Gaurav Khanna, Richard Price | Closed Timelike Curves and "Effective" Superluminal Travel with Naked
Line Singularities | 10 pages, 5 figures; animation available on YouTube at:
https://youtu.be/ub6PGaygVwA | null | 10.1088/1361-6382/aad306 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine closed timelike curves (CTCs) and "effective" superluminal travel
in a spacetime containing naked line singularities, which we call "wires". Each
wire may be straight-line singularity or a ring singularity. The Weak Energy
Condition (WEC) is preserved in all well-defined regions of the spacetime. (The
sing... | [
{
"created": "Wed, 30 Aug 2017 23:51:17 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Jul 2018 13:00:40 GMT",
"version": "v2"
}
] | 2018-08-29 | [
[
"Mallary",
"Caroline",
""
],
[
"Khanna",
"Gaurav",
""
],
[
"Price",
"Richard",
""
]
] | We examine closed timelike curves (CTCs) and "effective" superluminal travel in a spacetime containing naked line singularities, which we call "wires". Each wire may be straight-line singularity or a ring singularity. The Weak Energy Condition (WEC) is preserved in all well-defined regions of the spacetime. (The singul... |
2203.14516 | Francesco Di Filippo | Francesco Di Filippo, Ra\'ul Carballo-Rubio, Stefano Liberati,
Costantino Pacilio, Matt Visser | On the inner horizon instability of non-singular black holes | Invited talk at the conference "The Quantum & The Gravity 2021" | null | null | YITP-22-22 | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Regular black holes represent a conservative model in which the classical
singularity is replaced by a non-singular core without necessarily modifying
the spacetime outside the trapping horizon. Given the possible lack of
phenomenological signatures, it is crucial to study the consistency of the
model. In this short ... | [
{
"created": "Mon, 28 Mar 2022 06:00:13 GMT",
"version": "v1"
}
] | 2022-03-29 | [
[
"Di Filippo",
"Francesco",
""
],
[
"Carballo-Rubio",
"Raúl",
""
],
[
"Liberati",
"Stefano",
""
],
[
"Pacilio",
"Costantino",
""
],
[
"Visser",
"Matt",
""
]
] | Regular black holes represent a conservative model in which the classical singularity is replaced by a non-singular core without necessarily modifying the spacetime outside the trapping horizon. Given the possible lack of phenomenological signatures, it is crucial to study the consistency of the model. In this short wo... |
0805.4585 | Carlo Rovelli | Carlo Rovelli, Francesca Vidotto | Stepping out of Homogeneity in Loop Quantum Cosmology | 16 pages | Class.Quant.Grav.25:225024,2008 | 10.1088/0264-9381/25/22/225024 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the extension of quantum cosmology outside the homogeneous
approximation, using the formalism of loop quantum gravity. We introduce a
model where some of the inhomogeneous degrees of freedom are present, providing
a tool for describing general fluctuations of quantum geometry near the initial
singularity. ... | [
{
"created": "Thu, 29 May 2008 17:08:59 GMT",
"version": "v1"
}
] | 2008-12-18 | [
[
"Rovelli",
"Carlo",
""
],
[
"Vidotto",
"Francesca",
""
]
] | We explore the extension of quantum cosmology outside the homogeneous approximation, using the formalism of loop quantum gravity. We introduce a model where some of the inhomogeneous degrees of freedom are present, providing a tool for describing general fluctuations of quantum geometry near the initial singularity. We... |
1912.12922 | Sebasti\'an Bahamonde Dr | Sebastian Bahamonde, Konstantinos Dialektopoulos, Ugur Camci | Exact spherically symmetric solutions in modified Gauss-Bonnet gravity
from Noether symmetry approach | 17 pages. Accepted for Publication in Symmetries in the special issue
"Noether's symmetry approach in gravity and cosmology" | Symmetry 2020, 12(1), 68 | 10.3390/sym12010068 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is broadly known that Lie point symmetries and their subcase, Noether
symmetries, can be used as a geometric criterion to select alternative theories
of gravity. Here, we use Noether symmetries as a selection criterion to
distinguish those models of $f(R,G)$ theory, with $R$ and $G$ being the Ricci
and the Gauss-B... | [
{
"created": "Mon, 30 Dec 2019 13:37:23 GMT",
"version": "v1"
}
] | 2020-01-10 | [
[
"Bahamonde",
"Sebastian",
""
],
[
"Dialektopoulos",
"Konstantinos",
""
],
[
"Camci",
"Ugur",
""
]
] | It is broadly known that Lie point symmetries and their subcase, Noether symmetries, can be used as a geometric criterion to select alternative theories of gravity. Here, we use Noether symmetries as a selection criterion to distinguish those models of $f(R,G)$ theory, with $R$ and $G$ being the Ricci and the Gauss-Bon... |
2211.14300 | Sergio Sevillano Mu\~noz | Sergio Sevillano Mu\~noz, Edmund J. Copeland, Peter Millington and
Michael Spannowsky | FeynMG: a FeynRules extension for scalar-tensor theories of gravity | 39 pages, 1 figure, GitLab link: https://gitlab.com/feynmg/FeynMG | Comput. Phys. Commun. 296 (2024), 109035 | 10.1016/j.cpc.2023.109035 | null | gr-qc astro-ph.CO hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | The ability to represent perturbative expansions of interacting quantum field
theories in terms of simple diagrammatic rules has revolutionized calculations
in particle physics (and elsewhere). Moreover, these rules are readily
automated, a process that has catalysed the rise of symbolic algebra packages.
However, in... | [
{
"created": "Fri, 25 Nov 2022 18:58:15 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Dec 2023 11:03:19 GMT",
"version": "v2"
}
] | 2024-07-30 | [
[
"Muñoz",
"Sergio Sevillano",
""
],
[
"Copeland",
"Edmund J.",
""
],
[
"Millington",
"Peter",
""
],
[
"Spannowsky",
"Michael",
""
]
] | The ability to represent perturbative expansions of interacting quantum field theories in terms of simple diagrammatic rules has revolutionized calculations in particle physics (and elsewhere). Moreover, these rules are readily automated, a process that has catalysed the rise of symbolic algebra packages. However, in t... |
2206.09227 | Kirill Bronnikov | K. A. Bronnikov | On black bounces, wormholes and partly phantom scalar fields | 12 pages, 6 figures. Significant corrections in some expressions for
particular examples. One reference added | Phys. Rev. D 106, 064029 (2022) | 10.1103/PhysRevD.106.064029 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Simpson and Visser recently proposed a phenomenological way to avoid some
kinds of space-time singularities by replacing a parameter whose zero value
corresponds to a singularity (say, $r$) with the manifestly nonzero expression
$r(u) = \sqrt{u^2 + b^2}$, where $u$ is a new coordinate, and $b =$ \const
$>0$. This tri... | [
{
"created": "Sat, 18 Jun 2022 15:48:28 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Jun 2022 15:09:11 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Sep 2022 14:09:14 GMT",
"version": "v3"
},
{
"created": "Thu, 9 Feb 2023 17:18:04 GMT",
"version": "v4"
}
] | 2023-02-10 | [
[
"Bronnikov",
"K. A.",
""
]
] | Simpson and Visser recently proposed a phenomenological way to avoid some kinds of space-time singularities by replacing a parameter whose zero value corresponds to a singularity (say, $r$) with the manifestly nonzero expression $r(u) = \sqrt{u^2 + b^2}$, where $u$ is a new coordinate, and $b =$ \const $>0$. This trick... |
gr-qc/0012047 | Tevian Dray | Tevian Dray, George Ellis, and Charles Hellaby | Note on Signature Change and Colombeau Theory | REVTex, 3 pages; to appear in GRG | Gen.Rel.Grav. 33 (2001) 1041-1046 | 10.1023/A:1010228315205 | null | gr-qc | null | Recent work alludes to various `controversies' associated with signature
change in general relativity. As we have argued previously, these are in fact
disagreements about the (often unstated) assumptions underlying various
possible approaches. The choice between approaches remains open.
| [
{
"created": "Wed, 13 Dec 2000 21:53:33 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Dray",
"Tevian",
""
],
[
"Ellis",
"George",
""
],
[
"Hellaby",
"Charles",
""
]
] | Recent work alludes to various `controversies' associated with signature change in general relativity. As we have argued previously, these are in fact disagreements about the (often unstated) assumptions underlying various possible approaches. The choice between approaches remains open. |
1508.04951 | Parthapratim Pradhan | Parthapratim Pradhan | Thermodynamic Product Formula for Taub-NUT Black Hole | 10 Pages, Accepted in Journal of Experimental and Theoretical
Physics(JETP), 05/08/2015 | JETP Vol. 149 (1) (2016) | 10.1134/S1063776116010088 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive various important thermodynamic relations of the inner and outer
horizon in the background of Taub-NUT(Newman-Unti-Tamburino) black hole in four
dimensional \emph{Lorentzian geometry}. We compare these properties with the
properties of Reissner Nordstr{\o}m black hole. We compute \emph{area product,
area su... | [
{
"created": "Thu, 20 Aug 2015 10:51:41 GMT",
"version": "v1"
}
] | 2016-05-04 | [
[
"Pradhan",
"Parthapratim",
""
]
] | We derive various important thermodynamic relations of the inner and outer horizon in the background of Taub-NUT(Newman-Unti-Tamburino) black hole in four dimensional \emph{Lorentzian geometry}. We compare these properties with the properties of Reissner Nordstr{\o}m black hole. We compute \emph{area product, area sum,... |
gr-qc/0204030 | Roberto Giambo' | Roberto Giambo', Fabio Giannoni, Giulio Magli, Paolo Piccione | New solutions of Einstein equations in spherical symmetry: the Cosmic
Censor to the court | LaTeX2e, 18 pages, to appear in Comm. Math. Phys | Commun.Math.Phys. 235 (2003) 545-563 | 10.1007/s00220-003-0793-9 | null | gr-qc | null | A new class of solutions of the Einstein field equations in spherical
symmetry is found. The new solutions are mathematically described as the
metrics admitting separation of variables in area-radius coordinates.
Physically, they describe the gravitational collapse of a class of anisotropic
elastic materials. Standar... | [
{
"created": "Sat, 6 Apr 2002 17:11:19 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Dec 2002 17:24:16 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Giambo'",
"Roberto",
""
],
[
"Giannoni",
"Fabio",
""
],
[
"Magli",
"Giulio",
""
],
[
"Piccione",
"Paolo",
""
]
] | A new class of solutions of the Einstein field equations in spherical symmetry is found. The new solutions are mathematically described as the metrics admitting separation of variables in area-radius coordinates. Physically, they describe the gravitational collapse of a class of anisotropic elastic materials. Standard ... |
1901.04302 | Muhammad Sharif | M. Sharif and Aisha Siddiqa | Models of Collapsing and Expanding Cylindrical Source in f(R,T) Theory | 29 pages, 22 figures, to appear in AHEP | Ad. High Energy Phys. 2019(2019)8702795 | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the collapsing and expanding solutions of anisotropic charged
cylinder in the context of $f(R,T)$ theory ($R$ represents the Ricci scalar and
$T$ denotes the trace of energy-momentum tensor). For this purpose, we take an
auxiliary solution of Einstein-Maxwell field equations and evaluate expansion
scalar w... | [
{
"created": "Thu, 10 Jan 2019 06:50:13 GMT",
"version": "v1"
}
] | 2019-02-19 | [
[
"Sharif",
"M.",
""
],
[
"Siddiqa",
"Aisha",
""
]
] | We discuss the collapsing and expanding solutions of anisotropic charged cylinder in the context of $f(R,T)$ theory ($R$ represents the Ricci scalar and $T$ denotes the trace of energy-momentum tensor). For this purpose, we take an auxiliary solution of Einstein-Maxwell field equations and evaluate expansion scalar who... |
gr-qc/9912082 | Daniele Oriti | Daniele Oriti (1) ((1) I.C.R.A. - International Center for
Relativistic Astrophysics) | The spinor field in Rindler spacetime: an analysis of the Unruh effect | 20 pages, 1 figure, to be published in the Proceedings of The 3rd
Icra Network Workshop and 6th Italo-Korean Meeting on Relativistic
Astrophysics | Nuovo Cim.B115:1005-1024,2000 | null | null | gr-qc | null | We analyse the quantization procedure of the spinor field in the Rindler
spacetime, showing the boundary conditions that should be imposed to the field,
in order to have a well posed theory. We then investigate the relationship
between this construction and the usual one in Minkowski spacetime. This leads
to the conc... | [
{
"created": "Mon, 20 Dec 1999 16:16:17 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Oriti",
"Daniele",
""
]
] | We analyse the quantization procedure of the spinor field in the Rindler spacetime, showing the boundary conditions that should be imposed to the field, in order to have a well posed theory. We then investigate the relationship between this construction and the usual one in Minkowski spacetime. This leads to the concep... |
gr-qc/0205102 | Eric Gourgoulhon | Dorota Gondek-Rosinska and Eric Gourgoulhon (LUTH, CNRS / Observatoire
de Paris) | Jacobi-like bar mode instability of relativistic rotating bodies | 15 pages, 8 figures, submitted to Phys. Rev. D | Phys.Rev. D66 (2002) 044021 | 10.1103/PhysRevD.66.044021 | null | gr-qc astro-ph | null | We perform some numerical study of the secular triaxial instability of
rigidly rotating homogeneous fluid bodies in general relativity. In the
Newtonian limit, this instability arises at the bifurcation point between the
Maclaurin and Jacobi sequences. It can be driven in astrophysical systems by
viscous dissipation.... | [
{
"created": "Thu, 23 May 2002 13:43:59 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Gondek-Rosinska",
"Dorota",
"",
"LUTH, CNRS / Observatoire\n de Paris"
],
[
"Gourgoulhon",
"Eric",
"",
"LUTH, CNRS / Observatoire\n de Paris"
]
] | We perform some numerical study of the secular triaxial instability of rigidly rotating homogeneous fluid bodies in general relativity. In the Newtonian limit, this instability arises at the bifurcation point between the Maclaurin and Jacobi sequences. It can be driven in astrophysical systems by viscous dissipation. W... |
0911.3062 | Betti Hartmann | Betti Hartmann and Jon Urrestilla | Gravitating Semilocal strings | Contribution to the Proceedings of the Spanish Relativity Meeting
(ERE) 2009, Bilbao, Spain | J.Phys.Conf.Ser.229:012008,2010 | 10.1088/1742-6596/229/1/012008 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the properties of semilocal strings minimally coupled to gravity.
Semilocal strings are solutions of the bosonic sector of the Standard Model in
the limit $\sin^2\theta_W=1$ (where $\theta_W$ is the Weinberg angle) and
correspond to embedded Abelian-Higgs strings for a particular choice of the
scalar doubl... | [
{
"created": "Mon, 16 Nov 2009 16:00:58 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Hartmann",
"Betti",
""
],
[
"Urrestilla",
"Jon",
""
]
] | We discuss the properties of semilocal strings minimally coupled to gravity. Semilocal strings are solutions of the bosonic sector of the Standard Model in the limit $\sin^2\theta_W=1$ (where $\theta_W$ is the Weinberg angle) and correspond to embedded Abelian-Higgs strings for a particular choice of the scalar doublet... |
2308.02115 | Junpei Harada | Junpei Harada | Gravity at cosmological distances: Explaining the accelerating expansion
without dark energy | 7 pages, 1 figure; accepted for publication in Phys.Rev.D, v2:
published version | Phys. Rev. D 108, 044031 (2023) | 10.1103/PhysRevD.108.044031 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Three theoretical criteria for gravitational theories beyond general
relativity are considered: obtaining the cosmological constant as an
integration constant, deriving the energy conservation law as a consequence of
the field equations, rather than assuming it, and not necessarily considering
conformally flat metric... | [
{
"created": "Fri, 4 Aug 2023 02:44:23 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Aug 2023 04:28:35 GMT",
"version": "v2"
}
] | 2023-08-17 | [
[
"Harada",
"Junpei",
""
]
] | Three theoretical criteria for gravitational theories beyond general relativity are considered: obtaining the cosmological constant as an integration constant, deriving the energy conservation law as a consequence of the field equations, rather than assuming it, and not necessarily considering conformally flat metrics ... |
1402.0600 | Viktor Toth | Viktor T. Toth | Self-gravitating Bose-Einstein condensates and the Thomas-Fermi
approximation | 8 pages, 2 figures. Updated manuscript to match published version | Galaxies 2016, 4(3), 9 | 10.3390/galaxies4030009 | null | gr-qc astro-ph.GA cond-mat.quant-gas | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Self-gravitating Bose-Einstein condensates (BEC) have been proposed in
various astrophysical contexts, including Bose-stars and BEC dark matter halos.
These systems are described by a combination of the Gross-Pitaevskii and
Poisson equations (the GPP system). In the analysis of these hypothetical
objects, the Thomas-... | [
{
"created": "Tue, 4 Feb 2014 03:12:44 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Mar 2014 19:34:21 GMT",
"version": "v2"
},
{
"created": "Mon, 15 Aug 2016 13:03:33 GMT",
"version": "v3"
}
] | 2016-08-16 | [
[
"Toth",
"Viktor T.",
""
]
] | Self-gravitating Bose-Einstein condensates (BEC) have been proposed in various astrophysical contexts, including Bose-stars and BEC dark matter halos. These systems are described by a combination of the Gross-Pitaevskii and Poisson equations (the GPP system). In the analysis of these hypothetical objects, the Thomas-Fe... |
1612.06689 | Iver Brevik | I. Brevik and A. V. Timoshkin | Dissipative Universe-Inflation with Soft Singularity | 7 pages, no figures. To appear in Int. J. of Geometric Methods in
Modern Physics (IJGMMP) | Int. J. Geometric Meth. Mod. Phys. Vol. 14, No. 4 (2017) 1750061 | 10.1142/S021988781750061X | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the early-time accelerated universe after the Big Bang. We pay
attention to the dissipative properties of the inflationary universe in the
presence of a soft type singularity, making use of the parameters of the
generalized equation of state of the fluid. Flat Friedmann-Robertson-Walker
metric is being... | [
{
"created": "Tue, 20 Dec 2016 14:48:37 GMT",
"version": "v1"
}
] | 2017-03-23 | [
[
"Brevik",
"I.",
""
],
[
"Timoshkin",
"A. V.",
""
]
] | We investigate the early-time accelerated universe after the Big Bang. We pay attention to the dissipative properties of the inflationary universe in the presence of a soft type singularity, making use of the parameters of the generalized equation of state of the fluid. Flat Friedmann-Robertson-Walker metric is being u... |
1006.1027 | Kourosh Nozari | Kourosh Nozari and S. Shafizadeh | Non-Minimal Inflation Revisited | 17 pages, 5 figures | Phys.Scripta 82:015901,2010 | 10.1088/0031-8949/82/01/015901 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reconsider an inflationary model that inflaton field is non-minimally
coupled to gravity. We study parameter space of the model up to the second (
and in some cases third ) order of the slow-roll parameters. We calculate
inflation parameters in both Jordan and Einstein frames and the results are
compared in these ... | [
{
"created": "Sat, 5 Jun 2010 07:24:18 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Nozari",
"Kourosh",
""
],
[
"Shafizadeh",
"S.",
""
]
] | We reconsider an inflationary model that inflaton field is non-minimally coupled to gravity. We study parameter space of the model up to the second ( and in some cases third ) order of the slow-roll parameters. We calculate inflation parameters in both Jordan and Einstein frames and the results are compared in these tw... |
gr-qc/0512061 | Jos\'e Gaite | Jose Gaite | Stability of Self-Similar Spherical Accretion | Contribution to Spanish Relativity Meeting (ERE) 2005, held in
Oviedo, AIP Conference Proceedings, based on astro-ph/0511624, 4 pages | AIPConf.Proc.841:433-436,2006 | 10.1063/1.2218207 | null | gr-qc astro-ph | null | Spherical accretion flows are simple enough for analytical study, by solution
of the corresponding fluid dynamic equations. The solutions of stationary
spherical flow are due to Bondi. The questions of the choice of a physical
solution and of stability have been widely discussed. The answer to these
questions is very... | [
{
"created": "Mon, 12 Dec 2005 11:09:24 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Gaite",
"Jose",
""
]
] | Spherical accretion flows are simple enough for analytical study, by solution of the corresponding fluid dynamic equations. The solutions of stationary spherical flow are due to Bondi. The questions of the choice of a physical solution and of stability have been widely discussed. The answer to these questions is very d... |
2407.03031 | Beatriz Elizaga Navascu\'es | Ivan Agullo, Paula Calizaya Cabrera and Beatriz Elizaga Navascu\'es | Entangled pairs in evaporating black holes without event horizons | 31 pages, 5 figures, 3 appendices | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Investigations into Hawking radiation often assume a black hole model
featuring an event horizon, despite the growing consensus that such causal
structures may not exist in nature. While this assumption is not crucial for
deriving the local properties of radiation at future null infinity, it plays a
significant role ... | [
{
"created": "Wed, 3 Jul 2024 11:51:02 GMT",
"version": "v1"
}
] | 2024-07-04 | [
[
"Agullo",
"Ivan",
""
],
[
"Cabrera",
"Paula Calizaya",
""
],
[
"Navascués",
"Beatriz Elizaga",
""
]
] | Investigations into Hawking radiation often assume a black hole model featuring an event horizon, despite the growing consensus that such causal structures may not exist in nature. While this assumption is not crucial for deriving the local properties of radiation at future null infinity, it plays a significant role in... |
gr-qc/0608067 | Tetsuya Hara | Tetsuya Hara, Keita Sakai and Daigo Kajiura | Adopting the Uncertainty Principle for the Entropy Estimation of Black
Holes, de Sitter Space and Rindler Space | 11pages | null | null | null | gr-qc | null | By a simple physical consideration and uncertain principle, we derive that
temperature is proportional to the surface gravity and entropy is proportional
to the surface area of the black hole. We apply the same consideration to de
Sitter space and estimate the temperature and entropy of the space, then we
deduce that... | [
{
"created": "Mon, 14 Aug 2006 03:28:34 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hara",
"Tetsuya",
""
],
[
"Sakai",
"Keita",
""
],
[
"Kajiura",
"Daigo",
""
]
] | By a simple physical consideration and uncertain principle, we derive that temperature is proportional to the surface gravity and entropy is proportional to the surface area of the black hole. We apply the same consideration to de Sitter space and estimate the temperature and entropy of the space, then we deduce that t... |
gr-qc/9504040 | Franz Embacher | Franz Embacher | Dimensionality, topology, energy, the cosmological constant, and
signature change | 34 pages, LaTeX, no figures | Class.Quant.Grav. 13 (1996) 921-942 | 10.1088/0264-9381/13/5/012 | UWThPh-1995-11 | gr-qc | null | Using the concept of real tunneling configurations (classical signature
change) and nucleation energy, we explore the consequences of an alternative
minimization procedure for the Euclidean action in multiple-dimensional quantum
cosmology. In both standard Hartle-Hawking type as well as Coleman type
wormhole-based ap... | [
{
"created": "Tue, 25 Apr 1995 13:37:00 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Embacher",
"Franz",
""
]
] | Using the concept of real tunneling configurations (classical signature change) and nucleation energy, we explore the consequences of an alternative minimization procedure for the Euclidean action in multiple-dimensional quantum cosmology. In both standard Hartle-Hawking type as well as Coleman type wormhole-based appr... |
1201.1371 | Zhi-Guo Liu | Zhi-Guo Liu, Yun-Song Piao | Scalar Perturbations Through Cycles | 7 pages, 10 figures | null | 10.1103/PhysRevD.86.083510 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analytically and numerically investigate the evolutions of the scalar
perturbations through the cycles with nonsingular bounce. It is found that the
amplitude of the curvature perturbation on large scale will be amplified cycle
by cycle, and the isocurvature perturbations also obtain an amplification, but
the rate... | [
{
"created": "Fri, 6 Jan 2012 08:53:02 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Liu",
"Zhi-Guo",
""
],
[
"Piao",
"Yun-Song",
""
]
] | We analytically and numerically investigate the evolutions of the scalar perturbations through the cycles with nonsingular bounce. It is found that the amplitude of the curvature perturbation on large scale will be amplified cycle by cycle, and the isocurvature perturbations also obtain an amplification, but the rate o... |
0909.5435 | Andrew Randono | Andrew Randono | de Sitter Spaces | V2: Significant changes to argument for why solutions are physically
distinct. Two diagrams, many references added | Class.Quant.Grav.27:105008,2010 | 10.1088/0264-9381/27/10/105008 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We exploit an interpretation of gravity as the symmetry broken phase of a de
Sitter gauge theory to construct new solutions to the first order field
equations. The new solutions are constructed by performing large $Spin(4,1)$
gauge transformations on the ordinary de Sitter solution and extracting first
the tetrad, th... | [
{
"created": "Tue, 29 Sep 2009 20:29:43 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Feb 2010 02:48:48 GMT",
"version": "v2"
}
] | 2010-11-01 | [
[
"Randono",
"Andrew",
""
]
] | We exploit an interpretation of gravity as the symmetry broken phase of a de Sitter gauge theory to construct new solutions to the first order field equations. The new solutions are constructed by performing large $Spin(4,1)$ gauge transformations on the ordinary de Sitter solution and extracting first the tetrad, then... |
2107.00046 | Pedro Fernandes | Pedro G. S. Fernandes, Pedro Carrilho, Timothy Clifton, David J.
Mulryne | Black Holes in the Scalar-Tensor Formulation of 4D Einstein-Gauss-Bonnet
Gravity: Uniqueness of Solutions, and a New Candidate for Dark Matter | 15 pages, 4 figures | Phys. Rev. D 104, 044029 (2021) | 10.1103/PhysRevD.104.044029 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study static black holes in the regularized 4D
Einstein-Gauss-Bonnet theory of gravity; a shift-symmetric scalar-tensor theory
that belongs to the Horndeski class. This theory features a simple black hole
solution that can be written in closed form, and which we show is the unique
static, spherically-... | [
{
"created": "Wed, 30 Jun 2021 18:08:35 GMT",
"version": "v1"
}
] | 2021-08-18 | [
[
"Fernandes",
"Pedro G. S.",
""
],
[
"Carrilho",
"Pedro",
""
],
[
"Clifton",
"Timothy",
""
],
[
"Mulryne",
"David J.",
""
]
] | In this work we study static black holes in the regularized 4D Einstein-Gauss-Bonnet theory of gravity; a shift-symmetric scalar-tensor theory that belongs to the Horndeski class. This theory features a simple black hole solution that can be written in closed form, and which we show is the unique static, spherically-sy... |
gr-qc/9212011 | Sukanya Sinha | Marcos Rosenbaum, Michael P. Ryan and Sukanya Sinha | A Nonlinear Model of a Quantum Minisuperspace System with Back Reaction | 31 pages, 7 figures(available on request) | Phys.Rev.D47:4443-4457,1993 | 10.1103/PhysRevD.47.4443 | null | gr-qc | null | We consider the quantum evolution of the space-independent mode of a $\lambda
{\phi}^4$ theory as a minisuperspace in the space of all $\phi$. The motion of
the wave packet in the minisuperspace is then compared to the motion of a wave
packet in a larger minisuperspace consisting of the original minisuperspace
plus o... | [
{
"created": "Wed, 16 Dec 1992 21:20:00 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Rosenbaum",
"Marcos",
""
],
[
"Ryan",
"Michael P.",
""
],
[
"Sinha",
"Sukanya",
""
]
] | We consider the quantum evolution of the space-independent mode of a $\lambda {\phi}^4$ theory as a minisuperspace in the space of all $\phi$. The motion of the wave packet in the minisuperspace is then compared to the motion of a wave packet in a larger minisuperspace consisting of the original minisuperspace plus one... |
2201.03640 | Gustavo Dotti | Gustavo Dotti | Linear Stability of Black Holes and Naked Singularities | Lecture notes delivered at the V Jos\'e Pl\'{\i}nio Baptista School
of Cosmology (Guarapari (Esp\'{\i}rito Santo) Brazil, September 30th to
October 5th, 2021) | Universe 2022, 8, 38 | 10.3390/universe8010038 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | These notes follow from a course delivered at the V Jos\'e Pl\'{\i}nio
Baptista School of Cosmology, held at Guarapari (Esp\'{\i}rito Santo) Brazil,
from 30 September to 5 October 2021. A review of the current status of the
linear stability of black holes and naked singularities is given. The standard
modal approach,... | [
{
"created": "Mon, 10 Jan 2022 20:44:56 GMT",
"version": "v1"
}
] | 2022-01-12 | [
[
"Dotti",
"Gustavo",
""
]
] | These notes follow from a course delivered at the V Jos\'e Pl\'{\i}nio Baptista School of Cosmology, held at Guarapari (Esp\'{\i}rito Santo) Brazil, from 30 September to 5 October 2021. A review of the current status of the linear stability of black holes and naked singularities is given. The standard modal approach, t... |
1506.07588 | Samuel Wilkinson Mr | Samuel A. Wilkinson and Andrew D. Greentree | Geometrogenesis under Quantum Graphity: problems with the ripening
Universe | 8 pages,4 figures | Phys. Rev. D 92, 084007 (2015) | 10.1103/PhysRevD.92.084007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum Graphity (QG) is a model of emergent geometry in which space is
represented by a dynamical graph. The graph evolves under the action of a
Hamiltonian from a high-energy pre-geometric state to a low-energy state in
which geometry emerges as a coarse-grained effective property of space. Here we
show the results... | [
{
"created": "Thu, 25 Jun 2015 00:45:50 GMT",
"version": "v1"
}
] | 2015-10-07 | [
[
"Wilkinson",
"Samuel A.",
""
],
[
"Greentree",
"Andrew D.",
""
]
] | Quantum Graphity (QG) is a model of emergent geometry in which space is represented by a dynamical graph. The graph evolves under the action of a Hamiltonian from a high-energy pre-geometric state to a low-energy state in which geometry emerges as a coarse-grained effective property of space. Here we show the results o... |
1703.05360 | F\'elix-Louis Juli\'e | F\'elix-Louis Juli\'e, Nathalie Deruelle | Two-body problem in Scalar-Tensor theories as a deformation of General
Relativity : an Effective-One-Body approach | null | Phys. Rev. D 95, 124054 (2017) | 10.1103/PhysRevD.95.124054 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we address the two-body problem in massless Scalar-Tensor (ST)
theories within an Effective-One-Body (EOB) framework. We focus on the first
building block of the EOB approach, that is, mapping the conservative part of
the two-body dynamics onto the geodesic motion of a test particle in an
effective exte... | [
{
"created": "Wed, 15 Mar 2017 19:17:36 GMT",
"version": "v1"
}
] | 2017-07-05 | [
[
"Julié",
"Félix-Louis",
""
],
[
"Deruelle",
"Nathalie",
""
]
] | In this paper we address the two-body problem in massless Scalar-Tensor (ST) theories within an Effective-One-Body (EOB) framework. We focus on the first building block of the EOB approach, that is, mapping the conservative part of the two-body dynamics onto the geodesic motion of a test particle in an effective extern... |
1409.4693 | Pierre-Henry Lambert | Pierre-Henry Lambert | Conformal symmetries of gravity from asymptotic methods: further
developments | PhD thesis, 144 pages; v2: reference 35 has been updated | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this thesis, the symmetry structure of gravitational theories at null
infinity is studied further, in the case of pure gravity in four dimensions and
also in the case of Einstein-Yang-Mills theory in $d$ dimensions with and
without a cosmological constant. The first part of this thesis is devoted to
the presentati... | [
{
"created": "Tue, 16 Sep 2014 16:42:00 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Aug 2015 17:58:46 GMT",
"version": "v2"
}
] | 2015-08-11 | [
[
"Lambert",
"Pierre-Henry",
""
]
] | In this thesis, the symmetry structure of gravitational theories at null infinity is studied further, in the case of pure gravity in four dimensions and also in the case of Einstein-Yang-Mills theory in $d$ dimensions with and without a cosmological constant. The first part of this thesis is devoted to the presentation... |
1602.03847 | lVC Publications | The LIGO Scientific Collaboration, the Virgo Collaboration | GW150914: Implications for the stochastic gravitational wave background
from binary black holes | 12 pages, 3 figures | Phys. Rev. Lett. 116, 131102 (2016) | 10.1103/PhysRevLett.116.131102 | LIGO-P1500222 | gr-qc astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The LIGO detection of the gravitational wave transient GW150914, from the
inspiral and merger of two black holes with masses $\gtrsim 30\,
\text{M}_\odot$, suggests a population of binary black holes with relatively
high mass. This observation implies that the stochastic gravitational-wave
background from binary blac... | [
{
"created": "Thu, 11 Feb 2016 19:26:54 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Mar 2016 19:13:21 GMT",
"version": "v2"
}
] | 2016-04-06 | [
[
"The LIGO Scientific Collaboration",
"",
""
],
[
"the Virgo Collaboration",
"",
""
]
] | The LIGO detection of the gravitational wave transient GW150914, from the inspiral and merger of two black holes with masses $\gtrsim 30\, \text{M}_\odot$, suggests a population of binary black holes with relatively high mass. This observation implies that the stochastic gravitational-wave background from binary black ... |
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