id stringlengths 9 13 | submitter stringlengths 1 64 ⌀ | authors stringlengths 5 22.9k | title stringlengths 4 245 | comments stringlengths 1 548 ⌀ | journal-ref stringlengths 4 362 ⌀ | doi stringlengths 12 82 ⌀ | report-no stringlengths 2 281 ⌀ | categories stringclasses 793
values | license stringclasses 9
values | orig_abstract stringlengths 24 1.95k | versions listlengths 1 30 | update_date stringlengths 10 10 | authors_parsed listlengths 1 1.74k | abstract stringlengths 21 1.95k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/0603074 | Ivan S. N. Booth | W. Kavanagh, I. Booth | Spacetimes containing slowly evolving horizons | 14 pages, 2 figures, small changes which are mainly clarifications to
the perturbed Schwarzschild section, final version to appear in PRD | Phys.Rev.D74:044027,2006 | 10.1103/PhysRevD.74.044027 | null | gr-qc | null | Slowly evolving horizons are trapping horizons that are "almost" isolated
horizons. This paper reviews their definition and discusses several spacetimes
containing such structures. These include certain Vaidya and Tolman-Bondi
solutions as well as (perturbatively) tidally distorted black holes. Taking
into account th... | [
{
"created": "Sun, 19 Mar 2006 17:43:46 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Apr 2006 12:56:46 GMT",
"version": "v2"
},
{
"created": "Tue, 29 Aug 2006 18:35:00 GMT",
"version": "v3"
}
] | 2011-07-19 | [
[
"Kavanagh",
"W.",
""
],
[
"Booth",
"I.",
""
]
] | Slowly evolving horizons are trapping horizons that are "almost" isolated horizons. This paper reviews their definition and discusses several spacetimes containing such structures. These include certain Vaidya and Tolman-Bondi solutions as well as (perturbatively) tidally distorted black holes. Taking into account the ... |
0806.4006 | L\'aszl\'o \'A Gergely | L\'aszl\'o \'A. Gergely | E\"otv\"os branes | v2: 6 pages, 4 figures; expanded introduction and bibliography;
published version | Phys.Rev.D79:086007,2009 | 10.1103/PhysRevD.79.086007 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The high value of brane tension has a crucial role in recovering Einstein's
general relativity at low energies. In the framework of a recently developed
formalism with variable brane tension one can pose the question, whether it was
always that high? In analogy with fluid membranes, in this paper we allow for
tempera... | [
{
"created": "Wed, 25 Jun 2008 01:02:32 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Apr 2009 12:04:36 GMT",
"version": "v2"
}
] | 2015-05-13 | [
[
"Gergely",
"László Á.",
""
]
] | The high value of brane tension has a crucial role in recovering Einstein's general relativity at low energies. In the framework of a recently developed formalism with variable brane tension one can pose the question, whether it was always that high? In analogy with fluid membranes, in this paper we allow for temperatu... |
2011.03816 | Danny Laghi | Danny Laghi, Gregorio Carullo, John Veitch, Walter Del Pozzo | Quantum black hole spectroscopy: probing the quantum nature of the black
hole area using LIGO-Virgo ringdown detections | 24 pages, 8 figures. v2: updated 1 figure, version accepted by CQG
(2021) | Class. Quantum Grav. 38 (2021) 095005 | 10.1088/1361-6382/abde19 | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a thorough observational investigation of the heuristic quantised
ringdown model presented in Foit & Kleban (2019). This model is based on the
Bekenstein-Mukhanov conjecture, stating that the area of a black hole horizon
is an integer multiple of the Planck area $l_P^2$ multiplied by a
phenomenological con... | [
{
"created": "Sat, 7 Nov 2020 17:34:34 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Apr 2021 18:00:15 GMT",
"version": "v2"
}
] | 2021-04-12 | [
[
"Laghi",
"Danny",
""
],
[
"Carullo",
"Gregorio",
""
],
[
"Veitch",
"John",
""
],
[
"Del Pozzo",
"Walter",
""
]
] | We present a thorough observational investigation of the heuristic quantised ringdown model presented in Foit & Kleban (2019). This model is based on the Bekenstein-Mukhanov conjecture, stating that the area of a black hole horizon is an integer multiple of the Planck area $l_P^2$ multiplied by a phenomenological const... |
gr-qc/0012093 | Ghanashyam Date | N. Dadhich and G. Date | On a Peculiar Family of Static, Axisymmetric, Vacuum Solutions of the
Einstein Equations | 12 pages, Latex, no figures | null | null | IUCAA-51/2000 | gr-qc | null | The Zipoy-Voorhees family of static, axisymmetric vacuum solutions forms an
interesting family in that it contains the Schwarzschild black hole excepting
which all other members have naked singularity. We analyze some properties of
the region near singularity by studying a natural family of 2-surfaces. We
establish t... | [
{
"created": "Sun, 24 Dec 2000 05:40:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dadhich",
"N.",
""
],
[
"Date",
"G.",
""
]
] | The Zipoy-Voorhees family of static, axisymmetric vacuum solutions forms an interesting family in that it contains the Schwarzschild black hole excepting which all other members have naked singularity. We analyze some properties of the region near singularity by studying a natural family of 2-surfaces. We establish tha... |
1711.04571 | Vasilis Oikonomou | S.D. Odintsov, V.K. Oikonomou | The Early-time Cosmology with Stiff Era from Modified Gravity | PRD Accepted | null | 10.1103/PhysRevD.96.104059 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we shall incorporate a stiff era in the Universe's evolution in
the context of $F(R)$ gravity. After deriving the vacuum $F(R)$ gravity, which
may realize a stiff evolution, we combine the stiff $F(R)$ gravity with an
$R^2$ model, and we construct a qualitative model for the inflationary and
stiff era, ... | [
{
"created": "Mon, 13 Nov 2017 13:25:04 GMT",
"version": "v1"
}
] | 2018-01-17 | [
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K.",
""
]
] | In this work, we shall incorporate a stiff era in the Universe's evolution in the context of $F(R)$ gravity. After deriving the vacuum $F(R)$ gravity, which may realize a stiff evolution, we combine the stiff $F(R)$ gravity with an $R^2$ model, and we construct a qualitative model for the inflationary and stiff era, wi... |
1106.0132 | Bruno Christophe | Bruno Christophe, Linda J. Spilker, John D. Anderson, Nicolas Andr\'e,
Sami W. Asmar, Jonathan Aurnou, Don Banfield, Antonella Barucci, Orfeu
Bertolami, Robert Bingham, Patrick Brown, Baptiste Cecconi, Jean-Michel
Courty, Hansj\"org Dittus, Leigh N. Fletcher, Bernard Foulon, Frederico
Francisco, Paulo J. S. Gil... | OSS (Outer Solar System): A fundamental and planetary physics mission to
Neptune, Triton and the Kuiper Belt | 43 pages, 10 figures, Accepted to Experimental Astronomy, Special
Issue Cosmic Vision. Revision according to reviewers comments | Experimental Astronomy 34:2 (2012) 203-242 | 10.1007/s10686-012-9309-y | null | gr-qc astro-ph.EP physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present OSS mission continues a long and bright tradition by associating
the communities of fundamental physics and planetary sciences in a single
mission with ambitious goals in both domains. OSS is an M-class mission to
explore the Neptune system almost half a century after flyby of the Voyager 2
spacecraft. Se... | [
{
"created": "Wed, 1 Jun 2011 09:47:13 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Jun 2012 17:32:24 GMT",
"version": "v2"
}
] | 2013-03-12 | [
[
"Christophe",
"Bruno",
""
],
[
"Spilker",
"Linda J.",
""
],
[
"Anderson",
"John D.",
""
],
[
"André",
"Nicolas",
""
],
[
"Asmar",
"Sami W.",
""
],
[
"Aurnou",
"Jonathan",
""
],
[
"Banfield",
"Don",
""
],
... | The present OSS mission continues a long and bright tradition by associating the communities of fundamental physics and planetary sciences in a single mission with ambitious goals in both domains. OSS is an M-class mission to explore the Neptune system almost half a century after flyby of the Voyager 2 spacecraft. Seve... |
gr-qc/0212004 | Peter Ostermann | Peter Ostermann | Relativity Theory and a Real Pioneer Effect | 5 pages; changed in this final version v3: abstract, appendix,
replaced section "E - Discussion" (even including the Hubble shift relativity
theory would obviously contradict a non-conventional Pioneer effect) | null | null | null | gr-qc | null | Keeping the relativistic laws of motion a non-conventional Pioneer effect
would prove an increase of the scale rate of atomic clocks in comparison with
planetary ones. Together with a slowly decreasing amount of about 60% due to
anisotropic radiation this would be a thinkable explanation for an apparent
anomalous acc... | [
{
"created": "Sun, 1 Dec 2002 15:35:39 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Jul 2003 15:18:15 GMT",
"version": "v2"
},
{
"created": "Tue, 28 Oct 2003 17:53:28 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Ostermann",
"Peter",
""
]
] | Keeping the relativistic laws of motion a non-conventional Pioneer effect would prove an increase of the scale rate of atomic clocks in comparison with planetary ones. Together with a slowly decreasing amount of about 60% due to anisotropic radiation this would be a thinkable explanation for an apparent anomalous accel... |
1111.1908 | Leandro Belo | Ednardo P. Spaniol, Leandro R. A. Belo, Juliano A. de Deus and Vanessa
C. de Andrade | The role of observers in the measurement of the Teleparallel
Gravitoelectromagnetic fields in different geometries | 10 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of the Teleparallel Equivalent of General Relativity (TEGR) we
have investigated the role of local observers, associated with tetrad fields,
in description of the gravitational interaction through the concepts of the
gravitoelectric (GE) and gravitomagnetic (GM) fields. We start by analyzing the
gravit... | [
{
"created": "Tue, 8 Nov 2011 13:52:32 GMT",
"version": "v1"
}
] | 2011-11-09 | [
[
"Spaniol",
"Ednardo P.",
""
],
[
"Belo",
"Leandro R. A.",
""
],
[
"de Deus",
"Juliano A.",
""
],
[
"de Andrade",
"Vanessa C.",
""
]
] | In the context of the Teleparallel Equivalent of General Relativity (TEGR) we have investigated the role of local observers, associated with tetrad fields, in description of the gravitational interaction through the concepts of the gravitoelectric (GE) and gravitomagnetic (GM) fields. We start by analyzing the gravitoe... |
1712.02394 | Arturo Gomez | Arturo J. Gomez and Carlos Paiva | Generalized detailed balance relation for black hole horizon's
fluctuations | 8pp | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In classical thermodynamics, irreversible processes are accomplished with an
increase of entropy and a release of heat into the environment. In the case of
black hole thermodynamics, instead, the increase of entropy is related with the
absorption of energy from the outside of the black hole. Based on this analogy,
th... | [
{
"created": "Wed, 6 Dec 2017 19:53:23 GMT",
"version": "v1"
}
] | 2017-12-08 | [
[
"Gomez",
"Arturo J.",
""
],
[
"Paiva",
"Carlos",
""
]
] | In classical thermodynamics, irreversible processes are accomplished with an increase of entropy and a release of heat into the environment. In the case of black hole thermodynamics, instead, the increase of entropy is related with the absorption of energy from the outside of the black hole. Based on this analogy, the ... |
1005.1445 | Hao Wei | Hao Wei | Cosmological Constraints on the Modified Entropic Force Model | 16 pages, 7 figures, revtex4; v2: discussions added, Phys. Lett. B in
press; v3: published version | Phys.Lett.B692:167-175,2010 | 10.1016/j.physletb.2010.07.036 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Very recently, Verlinde considered a theory in which space is emergent
through a holographic scenario, and proposed that gravity can be explained as
an entropic force caused by changes in the information associated with the
positions of material bodies. Then, motivated by the Debye model in
thermodynamics which is ve... | [
{
"created": "Mon, 10 May 2010 04:36:00 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jul 2010 07:31:00 GMT",
"version": "v2"
},
{
"created": "Mon, 16 Aug 2010 12:36:00 GMT",
"version": "v3"
}
] | 2010-08-17 | [
[
"Wei",
"Hao",
""
]
] | Very recently, Verlinde considered a theory in which space is emergent through a holographic scenario, and proposed that gravity can be explained as an entropic force caused by changes in the information associated with the positions of material bodies. Then, motivated by the Debye model in thermodynamics which is very... |
1903.11736 | Shao-Jiang Wang | Shao-Jiang Wang, Masaki Yamada, Alexander Vilenkin | Constraints on non-minimal coupling from quantum cosmology | v1, 15 pages, 2 figures; v2, 19 pages, 5 figures, version accepted
for publication in JCAP, discussion added to incorporate with a hilltop
potential | JCAP 1908 (2019) no.08, 025 | 10.1088/1475-7516/2019/08/025 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum cosmology is investigated in a de Sitter minisuperspace model with a
quantized scalar field non-minimally coupled to curvature. Quantum states of
the scalar field must satisfy the regularity condition, which requires that the
probability of field fluctuations should not increase with their amplitude. We
show ... | [
{
"created": "Thu, 28 Mar 2019 00:02:57 GMT",
"version": "v1"
},
{
"created": "Sat, 13 Jul 2019 16:03:47 GMT",
"version": "v2"
}
] | 2019-08-21 | [
[
"Wang",
"Shao-Jiang",
""
],
[
"Yamada",
"Masaki",
""
],
[
"Vilenkin",
"Alexander",
""
]
] | Quantum cosmology is investigated in a de Sitter minisuperspace model with a quantized scalar field non-minimally coupled to curvature. Quantum states of the scalar field must satisfy the regularity condition, which requires that the probability of field fluctuations should not increase with their amplitude. We show th... |
0810.5591 | Lydia Philpott | Fay Dowker, Lydia Philpott, and Rafael Sorkin | Energy-momentum diffusion from spacetime discreteness | 13 pages, 4 figures, corrected minor typos and updated to match
published version | Phys.Rev.D79:124047,2009 | 10.1103/PhysRevD.79.124047 | Imperial/TP/08/LP/1 | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study potentially observable consequences of spatiotemporal discreteness
for the motion of massive and massless particles. First we describe some simple
intrinsic models for the motion of a massive point particle in a fixed causal
set background. At large scales, the microscopic swerves induced by the
underlying a... | [
{
"created": "Fri, 31 Oct 2008 15:32:57 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Nov 2008 12:26:53 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Nov 2009 11:40:15 GMT",
"version": "v3"
}
] | 2009-11-25 | [
[
"Dowker",
"Fay",
""
],
[
"Philpott",
"Lydia",
""
],
[
"Sorkin",
"Rafael",
""
]
] | We study potentially observable consequences of spatiotemporal discreteness for the motion of massive and massless particles. First we describe some simple intrinsic models for the motion of a massive point particle in a fixed causal set background. At large scales, the microscopic swerves induced by the underlying ato... |
2109.13939 | Sebastian Murk | Robert B. Mann, Sebastian Murk, Daniel R. Terno | Paradoxes before the paradox: surface gravity and the information loss
problem | 10 pages, 1 figure. Revised version. Substantial changes in sections
III and IV, where higher-order corrections to radial null geodesics and the
evaporation time are taken into account. Comments welcome! | Phys. Rev. D 105, 124032 (2022) | 10.1103/PhysRevD.105.124032 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The information loss paradox is widely regarded as one of the biggest open
problems in theoretical physics. Several classical and quantum features must be
present to enable its formulation. First, an event horizon is needed to justify
the objective status of tracing out degrees of freedom inside the black hole.
Secon... | [
{
"created": "Tue, 28 Sep 2021 18:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Dec 2021 10:00:09 GMT",
"version": "v2"
},
{
"created": "Mon, 20 Jun 2022 06:44:01 GMT",
"version": "v3"
},
{
"created": "Thu, 2 Nov 2023 13:06:25 GMT",
"version": "v4"
}
] | 2023-11-03 | [
[
"Mann",
"Robert B.",
""
],
[
"Murk",
"Sebastian",
""
],
[
"Terno",
"Daniel R.",
""
]
] | The information loss paradox is widely regarded as one of the biggest open problems in theoretical physics. Several classical and quantum features must be present to enable its formulation. First, an event horizon is needed to justify the objective status of tracing out degrees of freedom inside the black hole. Second,... |
1801.05789 | Sean Gryb | Sean Gryb and Karim P. Y. Th\'ebault | Bouncing Unitary Cosmology I: Mini-Superspace General Solution | Version published in Classical Quantum Gravity. 21 pages, 4 figures | null | 10.1088/1361-6382/aaf823 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We offer a new proposal for cosmic singularity resolution based upon a
quantum cosmology with a unitary bounce. This proposal is illustrated via a
novel quantization of a mini-superspace model in which there can be
superpositions of the cosmological constant. This possibility leads to a
finite, bouncing unitary cosmo... | [
{
"created": "Wed, 17 Jan 2018 18:37:52 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Dec 2018 11:30:11 GMT",
"version": "v2"
}
] | 2018-12-17 | [
[
"Gryb",
"Sean",
""
],
[
"Thébault",
"Karim P. Y.",
""
]
] | We offer a new proposal for cosmic singularity resolution based upon a quantum cosmology with a unitary bounce. This proposal is illustrated via a novel quantization of a mini-superspace model in which there can be superpositions of the cosmological constant. This possibility leads to a finite, bouncing unitary cosmolo... |
1903.10471 | Betti Hartmann | Yves Brihaye (Uni Mons, Belgium), and Betti Hartmann (IFSC,
Universidade de S\~ao Paulo, Brazil) | Spontaneous scalarization of boson stars | 10 pages including 5 figures and one table; v2: results on
scalar-Gauss-Bonnet model added (including 3 new figures), references added,
15 pages, 8 figures, 1 table | null | 10.1007/JHEP09(2019)049 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the spontaneous scalarization of spherically symmetric,
asymptotically flat boson stars in the $(\alpha {\cal R} + \gamma {\cal G})
\phi^2$ scalar-tensor gravity model. These compact objects are made of a
complex valued scalar field that has harmonic time dependence, while their
space-time is static and they... | [
{
"created": "Mon, 25 Mar 2019 17:18:06 GMT",
"version": "v1"
},
{
"created": "Tue, 28 May 2019 01:49:50 GMT",
"version": "v2"
}
] | 2019-10-02 | [
[
"Brihaye",
"Yves",
"",
"Uni Mons, Belgium"
],
[
"Hartmann",
"Betti",
"",
"IFSC,\n Universidade de São Paulo, Brazil"
]
] | We study the spontaneous scalarization of spherically symmetric, asymptotically flat boson stars in the $(\alpha {\cal R} + \gamma {\cal G}) \phi^2$ scalar-tensor gravity model. These compact objects are made of a complex valued scalar field that has harmonic time dependence, while their space-time is static and they c... |
1606.01501 | Otakar Svitek | O. Svitek, T. Tahamtan | Nonsymmetric Dynamical Thin-Shell Wormhole in Robinson--Trautman Class | 1 figure, updated to reflect the published version | Eur. Phys. J. C 78 (2018) 167 | 10.1140/epjc/s10052-018-5628-0 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The thin-shell wormhole created using the Darmois-Israel formalism applied to
Robinson-Trautman family of spacetimes is presented. The stress energy tensor
created on the throat is interpreted in terms of two dust streams and it is
shown that asymptotically this wormhole settles to the Schwarzschild wormhole
with a t... | [
{
"created": "Sun, 5 Jun 2016 12:10:18 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Aug 2017 15:55:32 GMT",
"version": "v2"
},
{
"created": "Mon, 4 Sep 2017 15:42:27 GMT",
"version": "v3"
},
{
"created": "Fri, 2 Mar 2018 10:02:50 GMT",
"version": "v4"
}
] | 2018-03-05 | [
[
"Svitek",
"O.",
""
],
[
"Tahamtan",
"T.",
""
]
] | The thin-shell wormhole created using the Darmois-Israel formalism applied to Robinson-Trautman family of spacetimes is presented. The stress energy tensor created on the throat is interpreted in terms of two dust streams and it is shown that asymptotically this wormhole settles to the Schwarzschild wormhole with a thr... |
2404.11346 | Wolfgang Kastaun | Wolfgang Kastaun and Frank Ohme | Modern tools for computing neutron star properties | 25 pages, 11 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | Astronomical observations place increasingly tighter and more diverse
constraints on the properties of neutron stars (NS). Examples include
observations of radio or gamma-ray pulsars, accreting neutron stars and x-ray
bursts, magnetar giant flares, and recently, the gravitational waves (GW) from
coalescing binary neu... | [
{
"created": "Wed, 17 Apr 2024 13:07:01 GMT",
"version": "v1"
}
] | 2024-04-18 | [
[
"Kastaun",
"Wolfgang",
""
],
[
"Ohme",
"Frank",
""
]
] | Astronomical observations place increasingly tighter and more diverse constraints on the properties of neutron stars (NS). Examples include observations of radio or gamma-ray pulsars, accreting neutron stars and x-ray bursts, magnetar giant flares, and recently, the gravitational waves (GW) from coalescing binary neutr... |
gr-qc/0611158 | Thomas Sotiriou | Thomas P. Sotiriou | The significance of matter coupling in f(R) gravity | Talk given at the 11th Marcel Grossman Meeting, Berlin, Germany,
23-29 Jul 2006 | Proceedings of the Eleventh Marcel Grossmann Meeting on General
Relativity, edited by H. Kleinert, R.T. Jantzen and R. Ruffini, p. 1223-1226,
(World Scientific, Singapore, 2008) | null | null | gr-qc astro-ph hep-th | null | The way one chooses to couple gravity to matter is an essential
characteristic of any gravitational theory. In theories where the gravitational
field is allowed to have more degrees of freedom than those of General
Relativity (e.g. scalar-tensor theory, f(R) gravity) this issue often becomes
even more important. We c... | [
{
"created": "Thu, 30 Nov 2006 20:05:28 GMT",
"version": "v1"
}
] | 2009-02-26 | [
[
"Sotiriou",
"Thomas P.",
""
]
] | The way one chooses to couple gravity to matter is an essential characteristic of any gravitational theory. In theories where the gravitational field is allowed to have more degrees of freedom than those of General Relativity (e.g. scalar-tensor theory, f(R) gravity) this issue often becomes even more important. We con... |
1209.1386 | Ivair Gontijo | I. Gontijo | A Physical Source of Dark Energy and Dark Matter | 29 pages, 6 figures | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A physical mechanism that produces three energy components is proposed as the
common origin of dark energy and dark matter. The first two have equations of
state W ~ 0 and act like dark matter, while the last has W ~ -1 at low
redshifts making it a candidate for dark energy. These are used to model the
supernovae Uni... | [
{
"created": "Thu, 6 Sep 2012 15:14:57 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Dec 2012 16:12:49 GMT",
"version": "v2"
}
] | 2012-12-12 | [
[
"Gontijo",
"I.",
""
]
] | A physical mechanism that produces three energy components is proposed as the common origin of dark energy and dark matter. The first two have equations of state W ~ 0 and act like dark matter, while the last has W ~ -1 at low redshifts making it a candidate for dark energy. These are used to model the supernovae Union... |
1906.08194 | Susanne Schander | S. Schander, T. Thiemann | Quantum Cosmological Backreactions III: Deparametrised Quantum
Cosmological Perturbation Theory | 13 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is the third paper in a series of four in which we use space adiabatic
methods in order to incorporate backreactions among the homogeneous and between
the homogeneous and inhomogeneous degrees of freedom in quantum cosmological
perturbation theory.
In this paper we consider a particular kind of cosmological pe... | [
{
"created": "Wed, 19 Jun 2019 16:14:38 GMT",
"version": "v1"
}
] | 2019-06-20 | [
[
"Schander",
"S.",
""
],
[
"Thiemann",
"T.",
""
]
] | This is the third paper in a series of four in which we use space adiabatic methods in order to incorporate backreactions among the homogeneous and between the homogeneous and inhomogeneous degrees of freedom in quantum cosmological perturbation theory. In this paper we consider a particular kind of cosmological pertur... |
1903.12471 | Gamal G.L. Nashed | A. M. Awad, G. G. L. Nashed and W. El Hanafy | Rotating charged AdS solutions in quadratic $f(T)$ gravity | 11 pages, Version accepted in EPJC | Eur. Phys. J. C (2019) 79:668 | 10.1140/epjc/s10052-019-7182-9 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a class of asymptotically anti-de Sitter charged rotating black
hole solutions in $f(T)$ gravity in $N$-dimensions, where $f(T)=T+\alpha
T^{2}$. These solutions are nontrivial extensions of the solutions presented in
\cite{Lemos:1994xp} and \cite{Awad:2002cz} in the context of general
relativity. They are ... | [
{
"created": "Thu, 28 Mar 2019 08:31:22 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Jul 2019 11:42:09 GMT",
"version": "v2"
}
] | 2019-08-29 | [
[
"Awad",
"A. M.",
""
],
[
"Nashed",
"G. G. L.",
""
],
[
"Hanafy",
"W. El",
""
]
] | We present a class of asymptotically anti-de Sitter charged rotating black hole solutions in $f(T)$ gravity in $N$-dimensions, where $f(T)=T+\alpha T^{2}$. These solutions are nontrivial extensions of the solutions presented in \cite{Lemos:1994xp} and \cite{Awad:2002cz} in the context of general relativity. They are ch... |
gr-qc/9905038 | Yuri P. Goncharov | Yu. P. Goncharov (Sankt-Petersburg State Technical University) | Twisted spinors on black holes | 6 pages, ReVTeX | JETP Lett. 69 (1999) 656-663; Pisma Zh.Eksp.Teor.Fiz. 69 (1999)
619-625 | 10.1134/1.568071 | null | gr-qc | null | We remark that the standard black hole topology admits twisted configurations
of spinor field due to existence of the twisted spinor bundles and analyse them
using the Schwarzschild black hole as an example. This is physically linked
with the natural presence of Dirac monopoles on black holes and entails marked
modif... | [
{
"created": "Wed, 12 May 1999 19:37:52 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Goncharov",
"Yu. P.",
"",
"Sankt-Petersburg State Technical University"
]
] | We remark that the standard black hole topology admits twisted configurations of spinor field due to existence of the twisted spinor bundles and analyse them using the Schwarzschild black hole as an example. This is physically linked with the natural presence of Dirac monopoles on black holes and entails marked modific... |
0711.1518 | Hajime Sotani | H. Sotani, A. Colaiuda, and K. D. Kokkotas | Constraints on the Magnetic Field Geometry of Magnetars | 5 pages, 5 figures | Mon.Not.Roy.Astron.Soc.385:2161,2008 | 10.1111/j.1365-2966.2008.12977.x | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effect of the magnetic field geometry on the oscillation spectra
of strongly magnetized stars. The magnetic field distributions include both
toroidal and poloidal contributions. We observe that the toroidal contribution
does not influence significantly the torsional oscillations of the crust.
Moreover, i... | [
{
"created": "Fri, 9 Nov 2007 18:09:18 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Oct 2008 13:52:35 GMT",
"version": "v2"
}
] | 2008-11-07 | [
[
"Sotani",
"H.",
""
],
[
"Colaiuda",
"A.",
""
],
[
"Kokkotas",
"K. D.",
""
]
] | We study the effect of the magnetic field geometry on the oscillation spectra of strongly magnetized stars. The magnetic field distributions include both toroidal and poloidal contributions. We observe that the toroidal contribution does not influence significantly the torsional oscillations of the crust. Moreover, in ... |
gr-qc/9704022 | null | L. Herrera, A. Di Prisco, J.L. Hernandez-Pastora, J. Martin, J.
Martinez | Thermal Conduction in Systems out of Hydrostatic Equilibrium | 16 pages, emTex (LaTex 2.09). To appear in Classical and Quantum
Gravity | Class.Quant.Grav.14:2239-2247,1997 | 10.1088/0264-9381/14/8/022 | null | gr-qc astro-ph | null | We analyse the effects of thermal conduction in a relativistic fluid, just
after its departure from hydrostatic equilibrium, on a time scale of the order
of thermal relaxation time. It is obtained that the resulting evolution will
critically depend on a parameter defined in terms of thermodynamic variables,
which is ... | [
{
"created": "Tue, 8 Apr 1997 11:59:21 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Herrera",
"L.",
""
],
[
"Di Prisco",
"A.",
""
],
[
"Hernandez-Pastora",
"J. L.",
""
],
[
"Martin",
"J.",
""
],
[
"Martinez",
"J.",
""
]
] | We analyse the effects of thermal conduction in a relativistic fluid, just after its departure from hydrostatic equilibrium, on a time scale of the order of thermal relaxation time. It is obtained that the resulting evolution will critically depend on a parameter defined in terms of thermodynamic variables, which is co... |
gr-qc/9911029 | Serge Winitzki | S. Winitzki, A. Vilenkin | Effective noise in stochastic description of inflation | 16 pages and 1 EPS figure, RevTeX 4 | Phys.Rev. D61 (2000) 084008 | 10.1103/PhysRevD.61.084008 | null | gr-qc astro-ph hep-th | null | Stochastic description of inflationary spacetimes emulates the growth of
vacuum fluctuations by an effective stochastic ``noise field'' which drives the
dynamics of the volume-smoothed inflaton. We investigate statistical properties
of this field and find its correlator to be a function of distance measured in
units ... | [
{
"created": "Mon, 8 Nov 1999 22:30:29 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Winitzki",
"S.",
""
],
[
"Vilenkin",
"A.",
""
]
] | Stochastic description of inflationary spacetimes emulates the growth of vacuum fluctuations by an effective stochastic ``noise field'' which drives the dynamics of the volume-smoothed inflaton. We investigate statistical properties of this field and find its correlator to be a function of distance measured in units of... |
1906.06149 | Ritabrata Biswas | Amritendu Haldar and Ritabrata Biswas | Thermodynamics of Reissner-Nordstr\"om Black Holes in Higher Dimensions:
Rainbow Gravity Background With General Uncertainty Principle | 22 pages, 66 figures | General Relativity and Gravitation (2019) 51:72 | 10.1007/s10714-019-2555-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the thermodynamic properties of
Reissner-Nordstr\"om black holes embedded in higher $(d)$ dimensions in the
framework of rainbow gravity incorporating the effects of the generalized
uncertainty principle. We also examine all the properties graphically by
varying the rainbow gravity param... | [
{
"created": "Fri, 7 Jun 2019 04:39:04 GMT",
"version": "v1"
}
] | 2019-06-17 | [
[
"Haldar",
"Amritendu",
""
],
[
"Biswas",
"Ritabrata",
""
]
] | In this paper, we investigate the thermodynamic properties of Reissner-Nordstr\"om black holes embedded in higher $(d)$ dimensions in the framework of rainbow gravity incorporating the effects of the generalized uncertainty principle. We also examine all the properties graphically by varying the rainbow gravity paramet... |
1512.03694 | Huriye Gursel | H. Gursel | Hawking Radiation of Warped Anti de Sitter and Rotating Hairy Black
Holes with Scalar Hair | 61 pages, M.Sc. Thesis in Physics defended at Eastern Mediterranean
University, Famagusta, Cyprus (September 2015) | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This thesis mainly focuses on the Hawking radiation (HR) evacuating from the
surface of the objects that have earned a reputation as the most extraordinary
objects existing so far; the black holes (BHs). Throughout this study, quantum
tunneling (QT) process serves as the model for the HR of scalar, vector and
Dirac p... | [
{
"created": "Fri, 11 Dec 2015 16:23:27 GMT",
"version": "v1"
}
] | 2015-12-14 | [
[
"Gursel",
"H.",
""
]
] | This thesis mainly focuses on the Hawking radiation (HR) evacuating from the surface of the objects that have earned a reputation as the most extraordinary objects existing so far; the black holes (BHs). Throughout this study, quantum tunneling (QT) process serves as the model for the HR of scalar, vector and Dirac par... |
0911.3175 | James Ira Thorpe | James Ira Thorpe | LISA long-arm interferometry | 13 pages, 5 figures, Submitted to C&QG for proceedings of 8th Eduardo
Amaldi Conference | null | 10.1088/0264-9381/27/8/084008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Laser Interferometer Space Antenna (LISA) will observe gravitational
radiation in the milliHertz band by measuring picometer-level fluctuations in
the distance between drag-free proof masses over baselines of approximately
five million kilometers. The measurement over each baseline will be divided
into three part... | [
{
"created": "Mon, 16 Nov 2009 22:08:52 GMT",
"version": "v1"
}
] | 2015-05-14 | [
[
"Thorpe",
"James Ira",
""
]
] | The Laser Interferometer Space Antenna (LISA) will observe gravitational radiation in the milliHertz band by measuring picometer-level fluctuations in the distance between drag-free proof masses over baselines of approximately five million kilometers. The measurement over each baseline will be divided into three parts:... |
2006.12225 | Francisco Diego Mazzitelli | Francisco D. Mazzitelli | The infalling photon, the infalling particle, and the observer at rest
near the horizon of a black hole | Pedagogical article, to appear in Eur. J. Phys. 14 pages, no figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When a massive test particle or a photon fall radially into a black hole,
their energy, as measured by a static observer located very close to the
horizon, diverges. In introductory courses on General Relativity, this fact
gives rise to questions about the reality of this divergence, and its eventual
effect on the ge... | [
{
"created": "Mon, 22 Jun 2020 13:24:09 GMT",
"version": "v1"
}
] | 2020-06-23 | [
[
"Mazzitelli",
"Francisco D.",
""
]
] | When a massive test particle or a photon fall radially into a black hole, their energy, as measured by a static observer located very close to the horizon, diverges. In introductory courses on General Relativity, this fact gives rise to questions about the reality of this divergence, and its eventual effect on the geom... |
gr-qc/0605066 | Abhas Mitra | Abhas Mitra | Why Gravitational Contraction Must be Accompanied by Emission of
Radiation Both in Newtonian and Einstein Gravity | Minor corrections, maiden derivation of proper GR virial theorem,
shows there is no strict adiabatic collapse | Phys.Rev. D74 (2006) 024010 | 10.1103/PhysRevD.74.024010 | null | gr-qc astro-ph | null | By using virial theorem, Helmholtz and Kelvin showed that the contraction of
a bound self-gravitating system must be accompanied by release of radiation
energy irrespective of the details of the contraction process. This happens
because the total Newtonian energy of the system E_N (and not just the
Newtonian gravitat... | [
{
"created": "Thu, 11 May 2006 09:55:22 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jun 2006 14:30:24 GMT",
"version": "v2"
},
{
"created": "Mon, 10 Jul 2006 15:58:38 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Mitra",
"Abhas",
""
]
] | By using virial theorem, Helmholtz and Kelvin showed that the contraction of a bound self-gravitating system must be accompanied by release of radiation energy irrespective of the details of the contraction process. This happens because the total Newtonian energy of the system E_N (and not just the Newtonian gravitatio... |
2407.07952 | Zhi-Chao Li | Zhi-Chao Li, H. Lu | Regular Electric Black Holes from EMS Gravity | Latex, 28 pages, 3 graphs grouped in one figure | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct Einstein-Maxwell-Scalar (EMS) theories that admit regular
electric black holes. Such a Maxwell-scalar theory is equivalent to some
nonlinear electrodynamics (NLED) at the level of equations of motion, but it
has the advantage of circumventing the no-go theorem of regular electric black
holes under a give... | [
{
"created": "Wed, 10 Jul 2024 18:00:08 GMT",
"version": "v1"
}
] | 2024-07-12 | [
[
"Li",
"Zhi-Chao",
""
],
[
"Lu",
"H.",
""
]
] | We construct Einstein-Maxwell-Scalar (EMS) theories that admit regular electric black holes. Such a Maxwell-scalar theory is equivalent to some nonlinear electrodynamics (NLED) at the level of equations of motion, but it has the advantage of circumventing the no-go theorem of regular electric black holes under a given ... |
0808.1999 | Yasushi Mino | Yasushi Mino | Decoherence measure by gravitational wave interferometers | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the possibility to measure the quantum decoherence using
gravitational wave interferometers. Gravitational wave interferometers create
the superposition state of photons and measure the interference of the photon
state. If the decoherence occurs, the interference of the photon state vanishes
and it can be... | [
{
"created": "Thu, 14 Aug 2008 19:07:38 GMT",
"version": "v1"
}
] | 2008-08-15 | [
[
"Mino",
"Yasushi",
""
]
] | We consider the possibility to measure the quantum decoherence using gravitational wave interferometers. Gravitational wave interferometers create the superposition state of photons and measure the interference of the photon state. If the decoherence occurs, the interference of the photon state vanishes and it can be m... |
0810.5080 | Sergey S. Kokarev | Sergey S. Kokarev | Structural instability of Friedmann-Robertson-Walker cosmological models | 14 pages, 4 figures in TeXCad, developed version of talk, presented
at XIII Russian Gravitational Conference, June 2008, to be published in GRG,
minor changes concerning added references | Gen.Rel.Grav.41:1777-1794,2009 | 10.1007/s10714-008-0748-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmological singularity and asymptotic behaviour of scale factor of
generalized cosmological models are analyzed in respect of their structural
stability. It is shown, that cosmological singularity is structurally unstable
for the majority of models with barotropic perfect fluid with strong energy
condition. Inclusi... | [
{
"created": "Tue, 28 Oct 2008 16:53:42 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Nov 2008 15:41:43 GMT",
"version": "v2"
}
] | 2009-08-05 | [
[
"Kokarev",
"Sergey S.",
""
]
] | Cosmological singularity and asymptotic behaviour of scale factor of generalized cosmological models are analyzed in respect of their structural stability. It is shown, that cosmological singularity is structurally unstable for the majority of models with barotropic perfect fluid with strong energy condition. Inclusion... |
2404.02096 | Slava G. Turyshev | Slava G. Turyshev, Sheng-wey Chiow, Nan Yu | Searching for new physics in the solar system with tetrahedral
spacecraft formations | 28 pages, 7 figures | Phys. Rev. D 109(8), 084059 (2024) | 10.1103/PhysRevD.109.084059 | null | gr-qc astro-ph.CO astro-ph.IM physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Tetrahedral configurations of spacecraft on unperturbed heliocentric orbits
allow for highly precise observations of small spatial changes in the
gravitational field, especially those affecting the gravity gradient tensor
(GGT). The resulting high sensitivity may be used to search for new physics
that could manifest ... | [
{
"created": "Tue, 2 Apr 2024 16:46:11 GMT",
"version": "v1"
}
] | 2024-04-26 | [
[
"Turyshev",
"Slava G.",
""
],
[
"Chiow",
"Sheng-wey",
""
],
[
"Yu",
"Nan",
""
]
] | Tetrahedral configurations of spacecraft on unperturbed heliocentric orbits allow for highly precise observations of small spatial changes in the gravitational field, especially those affecting the gravity gradient tensor (GGT). The resulting high sensitivity may be used to search for new physics that could manifest it... |
gr-qc/0008072 | Robert Mann | R.B. Mann, G. Potvin and M. Raiteri | Energy for N-Body Motion in Two Dimensional Gravity | Latex, 27 pages | Class.Quant.Grav. 17 (2000) 4941-4958 | 10.1088/0264-9381/17/23/311 | WATPHYS-TH00/04 | gr-qc | null | A general definition of energy is given, via the N\"other theorem, for the
N-body problem in (1+1) dimensional gravity. Within a first-order Lagrangian
framework, the density of energy of a solution relative to a background is
identified with the superpotential of the theory. For specific applications we
reproduce th... | [
{
"created": "Tue, 29 Aug 2000 18:26:34 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Mann",
"R. B.",
""
],
[
"Potvin",
"G.",
""
],
[
"Raiteri",
"M.",
""
]
] | A general definition of energy is given, via the N\"other theorem, for the N-body problem in (1+1) dimensional gravity. Within a first-order Lagrangian framework, the density of energy of a solution relative to a background is identified with the superpotential of the theory. For specific applications we reproduce the ... |
2005.00360 | Kimet Jusufi | Kimet Jusufi | Nonlinear magnetically charged black holes in 4D Einstein-Gauss-Bonnet
gravity | 8 pages, 5 figures. Accepted for publication in Annals of Physics | Annals of Physics 421 (2020) 168285 | 10.1016/j.aop.2020.168285 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this letter we present an exact spherically symmetric and magnetically
charged black hole solution with exponential model of nonlinear electrodynamics
[S. Kruglov, Annals Phys. 378, 59-70 (2017)] in the context of 4D
Einstein-Gauss-Bonnet (EGB) gravity. We show that our $-$ve branch, in the
limit of GB coupling co... | [
{
"created": "Thu, 30 Apr 2020 14:14:10 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Aug 2020 11:23:10 GMT",
"version": "v2"
}
] | 2020-08-27 | [
[
"Jusufi",
"Kimet",
""
]
] | In this letter we present an exact spherically symmetric and magnetically charged black hole solution with exponential model of nonlinear electrodynamics [S. Kruglov, Annals Phys. 378, 59-70 (2017)] in the context of 4D Einstein-Gauss-Bonnet (EGB) gravity. We show that our $-$ve branch, in the limit of GB coupling coef... |
2004.08857 | Chen Songbai | Songbai Chen, Mingzhi Wang, Jiliang Jing | Polarization effects in Kerr black hole shadow due to the coupling
between photon and bumblebee field | 16 pages, 8 figures. Some references are added and accepted for
pubication in JHEP | JHEP 07 054 (2020) | 10.1007/JHEP07(2020)054 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present firstly the equation of motion for the photon coupled to a special
bumblebee vector field in a Kerr black hole spacetime and find that the
propagation of light depends on its polarization due to the birefringence
phenomenon. The dependence of black hole shadow on the light's polarization is
dominated by th... | [
{
"created": "Sun, 19 Apr 2020 14:06:28 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Apr 2020 03:11:09 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Jun 2020 01:35:09 GMT",
"version": "v3"
}
] | 2020-07-30 | [
[
"Chen",
"Songbai",
""
],
[
"Wang",
"Mingzhi",
""
],
[
"Jing",
"Jiliang",
""
]
] | We present firstly the equation of motion for the photon coupled to a special bumblebee vector field in a Kerr black hole spacetime and find that the propagation of light depends on its polarization due to the birefringence phenomenon. The dependence of black hole shadow on the light's polarization is dominated by the ... |
gr-qc/9611066 | Phil Perry | G. P. Perry and F. I. Cooperstock | Electrostatic Equilibrium of Two Spherical Charged Masses in General
Relativity | 21 pages, RevTeX, 2 Postscript figures | Class.Quant.Grav.14:1329-1345,1997 | 10.1088/0264-9381/14/5/032 | null | gr-qc | null | Approximate solutions representing the gravitational-electrostatic balance of
two arbitrary point sources in general relativity have led to contradictory
arguments in the literature with respect to the condition of balance. Up to the
present time, the only known exact solutions which can be interpreted as the
non-lin... | [
{
"created": "Wed, 27 Nov 1996 21:48:11 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Perry",
"G. P.",
""
],
[
"Cooperstock",
"F. I.",
""
]
] | Approximate solutions representing the gravitational-electrostatic balance of two arbitrary point sources in general relativity have led to contradictory arguments in the literature with respect to the condition of balance. Up to the present time, the only known exact solutions which can be interpreted as the non-linea... |
2212.04429 | Yen Chin Ong | Yen Chin Ong | An Effective Sign Switching Dark Energy: Lotka-Volterra Model of Two
Interacting Fluids | v2: added more clarifications and references | Universe 9 (2023) 10, 437 | 10.3390/universe9100437 | null | gr-qc astro-ph.CO math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the recent attempts to address the Hubble and $S_8$ tensions is to
consider the Universe started out not as a de Sitter-like spacetime, but rather
anti-de Sitter-like. That is, the Universe underwent an "AdS-to-dS" transition
at some point. We study the possibility that there are two dark energy fluids,
one of... | [
{
"created": "Thu, 8 Dec 2022 17:44:12 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Apr 2023 13:13:28 GMT",
"version": "v2"
}
] | 2023-12-05 | [
[
"Ong",
"Yen Chin",
""
]
] | One of the recent attempts to address the Hubble and $S_8$ tensions is to consider the Universe started out not as a de Sitter-like spacetime, but rather anti-de Sitter-like. That is, the Universe underwent an "AdS-to-dS" transition at some point. We study the possibility that there are two dark energy fluids, one of w... |
1206.0830 | Aharon Davidson | Aharon Davidson and Ben Yellin | Restoring Time Dependence into Quantum Cosmology | Honorable Mentioned essay - Gravity Research Foundation 2012 | IJMPD 21, 1242011 (2012) | 10.1142/S0218271812420114 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Mini superspace cosmology treats the scale factor $a(t)$, the lapse function
$n(t)$, and an optional dilation field $\phi(t)$ as canonical variables. While
pre-fixing $n(t)$ means losing the Hamiltonian constraint, pre-fixing $a(t)$ is
serendipitously harmless at this level. This suggests an alternative to the
Hartle... | [
{
"created": "Tue, 5 Jun 2012 07:27:05 GMT",
"version": "v1"
}
] | 2012-10-16 | [
[
"Davidson",
"Aharon",
""
],
[
"Yellin",
"Ben",
""
]
] | Mini superspace cosmology treats the scale factor $a(t)$, the lapse function $n(t)$, and an optional dilation field $\phi(t)$ as canonical variables. While pre-fixing $n(t)$ means losing the Hamiltonian constraint, pre-fixing $a(t)$ is serendipitously harmless at this level. This suggests an alternative to the Hartle-H... |
1906.09140 | Lukasz Bratek | {\L}ukasz Bratek, Joanna Ja{\l}ocha, Andrzej Woszczyna | Nakedly singular counterpart of Schwarzschild's incompressible star. A
barotropic continuity condition in the center | accepted (grg), 10 pages, 1 figure | null | 10.1007/s10714-019-2628-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A static sphere of incompressible fluid with uniform proper energy density is
considered as an example of exact star-like solution with weakened central
regularity conditions characteristic of a nakedly singular spherical vaccuum
solution. The solution is a singular counterpart of the Schwarzschild's
interior solutio... | [
{
"created": "Fri, 21 Jun 2019 13:44:10 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Nov 2019 21:01:30 GMT",
"version": "v2"
}
] | 2020-01-08 | [
[
"Bratek",
"Łukasz",
""
],
[
"Jałocha",
"Joanna",
""
],
[
"Woszczyna",
"Andrzej",
""
]
] | A static sphere of incompressible fluid with uniform proper energy density is considered as an example of exact star-like solution with weakened central regularity conditions characteristic of a nakedly singular spherical vaccuum solution. The solution is a singular counterpart of the Schwarzschild's interior solution.... |
0911.5075 | Alioscia Hamma | Alioscia Hamma, Fotini Markopoulou, Seth Lloyd, Francesco Caravelli,
Simone Severini, Klas Markstrom | A quantum Bose-Hubbard model with evolving graph as toy model for
emergent spacetime | 23 pages, 6 figures; updated to published version | Phys.Rev.D81:104032,2010 | 10.1103/PhysRevD.81.104032 | null | gr-qc cond-mat.str-el hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a toy model for interacting matter and geometry that explores
quantum dynamics in a spin system as a precursor to a quantum theory of
gravity. The model has no a priori geometric properties, instead, locality is
inferred from the more fundamental notion of interaction between the matter
degrees of freedom.... | [
{
"created": "Fri, 27 Nov 2009 20:46:50 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Nov 2009 14:10:34 GMT",
"version": "v2"
},
{
"created": "Tue, 27 Jul 2010 00:02:50 GMT",
"version": "v3"
}
] | 2014-11-20 | [
[
"Hamma",
"Alioscia",
""
],
[
"Markopoulou",
"Fotini",
""
],
[
"Lloyd",
"Seth",
""
],
[
"Caravelli",
"Francesco",
""
],
[
"Severini",
"Simone",
""
],
[
"Markstrom",
"Klas",
""
]
] | We present a toy model for interacting matter and geometry that explores quantum dynamics in a spin system as a precursor to a quantum theory of gravity. The model has no a priori geometric properties, instead, locality is inferred from the more fundamental notion of interaction between the matter degrees of freedom. T... |
2205.03567 | Raja Solanki | Raja Solanki, P.K. Sahoo | Statefinder Analysis of Symmetric Teleparallel Cosmology | Annalen der Physik published version | Annalen der Physik, 534(6) (2022) 2200076 | 10.1002/andp.202200076 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Statefinder diagnostic is a convenient method that can differentiate between
the various dark energy models. In this article, we analyze the statefinder
parameters in symmetric teleparallel cosmology. The $f(Q)$ gravity theory is an
alternative theory to GR, where gravitational interactions attribute to the
non-metri... | [
{
"created": "Sat, 7 May 2022 06:17:07 GMT",
"version": "v1"
}
] | 2022-06-27 | [
[
"Solanki",
"Raja",
""
],
[
"Sahoo",
"P. K.",
""
]
] | Statefinder diagnostic is a convenient method that can differentiate between the various dark energy models. In this article, we analyze the statefinder parameters in symmetric teleparallel cosmology. The $f(Q)$ gravity theory is an alternative theory to GR, where gravitational interactions attribute to the non-metrici... |
gr-qc/0104069 | Milovan | M. Vasilic | Consistency analysis of Kaluza-Klein geometric sigma models | 13 pages, RevTeX | Gen.Rel.Grav. 33 (2001) 1783-1798 | 10.1023/A:1013079318311 | null | gr-qc | null | Geometric sigma models are purely geometric theories of scalar fields coupled
to gravity. Geometrically, these scalars represent the very coordinates of
space-time, and, as such, can be gauged away. A particular theory is built over
a given metric field configuration which becomes the vacuum of the theory.
Kaluza-Kle... | [
{
"created": "Mon, 23 Apr 2001 13:05:21 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Vasilic",
"M.",
""
]
] | Geometric sigma models are purely geometric theories of scalar fields coupled to gravity. Geometrically, these scalars represent the very coordinates of space-time, and, as such, can be gauged away. A particular theory is built over a given metric field configuration which becomes the vacuum of the theory. Kaluza-Klein... |
2212.05568 | Asta Heinesen | Asta Heinesen | Reconciling a decelerating Universe with cosmological observations | 6 pages. Matches published version in PRD | Phys. Rev. D 107 (2023) L101301 | 10.1103/PhysRevD.107.L101301 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Can modern cosmological observations be reconciled with a
general-relativistic Universe without an anti-gravitating energy source?
Usually, the answer to this question by cosmologists is in the negative, and it
is commonly believed that the observed excess dimming of supernovae relative to
that in the Milne model is ... | [
{
"created": "Sun, 11 Dec 2022 18:19:10 GMT",
"version": "v1"
},
{
"created": "Thu, 25 May 2023 14:23:35 GMT",
"version": "v2"
}
] | 2023-05-26 | [
[
"Heinesen",
"Asta",
""
]
] | Can modern cosmological observations be reconciled with a general-relativistic Universe without an anti-gravitating energy source? Usually, the answer to this question by cosmologists is in the negative, and it is commonly believed that the observed excess dimming of supernovae relative to that in the Milne model is ev... |
2003.06445 | Carlos A. R. Herdeiro | Pedro V. P. Cunha, Carlos A. R. Herdeiro | Stationary black holes and light rings | 5 pages, 3 figures | Phys. Rev. Lett. 124, 181101 (2020) | 10.1103/PhysRevLett.124.181101 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The ringdown and shadow of the astrophysically significant Kerr Black Hole
(BH) are both intimately connected to a special set of bound null orbits known
as Light Rings (LRs). Does it hold that a generic equilibrium BH must possess
such orbits? In this letter we prove the following theorem. A stationary,
axi-symmetri... | [
{
"created": "Fri, 13 Mar 2020 19:00:02 GMT",
"version": "v1"
}
] | 2020-05-13 | [
[
"Cunha",
"Pedro V. P.",
""
],
[
"Herdeiro",
"Carlos A. R.",
""
]
] | The ringdown and shadow of the astrophysically significant Kerr Black Hole (BH) are both intimately connected to a special set of bound null orbits known as Light Rings (LRs). Does it hold that a generic equilibrium BH must possess such orbits? In this letter we prove the following theorem. A stationary, axi-symmetric,... |
2111.08652 | Xian Gao | Yu-Min Hu and Xian Gao | Covariant 3+1 correspondence of the spatially covariant gravity and the
degeneracy conditions | 19 pages, 1 figure | null | 10.1103/PhysRevD.105.044023 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | A necessary condition for a generally covariant scalar-tensor theory to be
ghostfree is that it contains no extra degrees of freedom in the unitary gauge,
in which the Lagrangian corresponds to the spatially covariant gravity.
Comparing with analysing the scalar-tensor theory directly, it is simpler to
map the spatia... | [
{
"created": "Tue, 16 Nov 2021 17:34:57 GMT",
"version": "v1"
}
] | 2022-02-23 | [
[
"Hu",
"Yu-Min",
""
],
[
"Gao",
"Xian",
""
]
] | A necessary condition for a generally covariant scalar-tensor theory to be ghostfree is that it contains no extra degrees of freedom in the unitary gauge, in which the Lagrangian corresponds to the spatially covariant gravity. Comparing with analysing the scalar-tensor theory directly, it is simpler to map the spatiall... |
2204.12304 | Ding Jia | Ding Jia | Is singularity resolution trivial? | 6 pages, 2 figures, comments welcome | null | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Many non-trivial ideas have been proposed to resolve singularities in quantum
gravity. In this short note I argue that singularity resolution can be trivial
in gravitational path integrals, because geodesically incomplete singular
spacetimes are usually not included in the sum. For theories where this holds,
there is... | [
{
"created": "Tue, 26 Apr 2022 13:32:19 GMT",
"version": "v1"
}
] | 2022-04-27 | [
[
"Jia",
"Ding",
""
]
] | Many non-trivial ideas have been proposed to resolve singularities in quantum gravity. In this short note I argue that singularity resolution can be trivial in gravitational path integrals, because geodesically incomplete singular spacetimes are usually not included in the sum. For theories where this holds, there is n... |
gr-qc/9503014 | Kostas Kokkotas | Nils Andersson, Kostas D. Kokkotas and Bernard F. Schutz | A NEW NUMERICAL APPROACH TO THE OSCILLATION MODES OF RELATIVISTIC STARS | 9 pages, 60Kb, mn.sty, 3 postscript figures, M.N.R.A.S. in press | Mon.Not.Roy.Astron.Soc. 274 (1995) 1039 | 10.1093/mnras/274.4.1039 | null | gr-qc | null | The oscillation modes of a simple polytropic stellar model are studied. Using
a new numerical approach (based on integration for complex coordinates) to the
problem for the stellar exterior we have computed the eigenfrequencies of the
highly damped w-modes. The results obtained agree well with recent ones of
Leins, N... | [
{
"created": "Wed, 8 Mar 1995 13:02:04 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Andersson",
"Nils",
""
],
[
"Kokkotas",
"Kostas D.",
""
],
[
"Schutz",
"Bernard F.",
""
]
] | The oscillation modes of a simple polytropic stellar model are studied. Using a new numerical approach (based on integration for complex coordinates) to the problem for the stellar exterior we have computed the eigenfrequencies of the highly damped w-modes. The results obtained agree well with recent ones of Leins, Nol... |
2307.13000 | Sujay Kr. Biswas | Sujoy Bhanja, Goutam Mandal, Abdulla Al Mamon and Sujay Kr. Biswas | Dynamical systems analysis of an interacting scalar field model in an
anisotropic universe | 35 pages, six captioned figures | Published in Journal of Cosmology and Astroparticle Physics;
JCAP10(2023)050 | 10.1088/1475-7516/2023/10/050 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate a non-canonical scalar field model in the
background dynamics of anisotropic Locally Rotationally Symmetric (LRS) Bianchi
type I universe where gravity is coupled minimally to scalar field which is
taken as dark energy and pressureless dust as dark matter are the main matter
content of t... | [
{
"created": "Sun, 23 Jul 2023 15:56:04 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Nov 2023 10:31:26 GMT",
"version": "v2"
}
] | 2023-11-17 | [
[
"Bhanja",
"Sujoy",
""
],
[
"Mandal",
"Goutam",
""
],
[
"Mamon",
"Abdulla Al",
""
],
[
"Biswas",
"Sujay Kr.",
""
]
] | In this paper, we investigate a non-canonical scalar field model in the background dynamics of anisotropic Locally Rotationally Symmetric (LRS) Bianchi type I universe where gravity is coupled minimally to scalar field which is taken as dark energy and pressureless dust as dark matter are the main matter content of the... |
2303.04472 | Tayyab Naseer | M. Sharif, Tayyab Naseer | Study of Charged Compact Stars in Non-minimally Coupled Gravity | 39 pages, 8 figures | Fortschr. Phys. 71(2023)2200147 | 10.1002/prop.202200147 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper studies the structural formation of various spherically symmetric
anisotropic configured stars in $f(\mathcal{R},\mathcal{T},\mathcal{Q})$
gravity under the influence of electromagnetic field, where
$\mathcal{Q}=\mathcal{R}_{\eta\sigma}\mathcal{T}^{\eta\sigma}$. We construct
modified field equations by ado... | [
{
"created": "Wed, 8 Mar 2023 09:45:54 GMT",
"version": "v1"
}
] | 2023-07-24 | [
[
"Sharif",
"M.",
""
],
[
"Naseer",
"Tayyab",
""
]
] | This paper studies the structural formation of various spherically symmetric anisotropic configured stars in $f(\mathcal{R},\mathcal{T},\mathcal{Q})$ gravity under the influence of electromagnetic field, where $\mathcal{Q}=\mathcal{R}_{\eta\sigma}\mathcal{T}^{\eta\sigma}$. We construct modified field equations by adopt... |
0708.0321 | Matthias Blau | Matthias Blau, Blaise Rollier | Brown-York Energy and Radial Geodesics | v3: 7 pages, shortened and revised version to appear in CQG | Class.Quant.Grav.25:105004,2008 | 10.1088/0264-9381/25/10/105004 | null | gr-qc hep-th | null | We compare the Brown-York (BY) and the standard Misner-Sharp (MS) quasilocal
energies for round spheres in spherically symmetric space-times from the point
of view of radial geodesics. In particular, we show that the relation between
the BY and MS energies is precisely analogous to that between the
(relativistic) ene... | [
{
"created": "Thu, 2 Aug 2007 11:15:52 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Aug 2007 19:26:23 GMT",
"version": "v2"
},
{
"created": "Fri, 4 Apr 2008 15:24:07 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Blau",
"Matthias",
""
],
[
"Rollier",
"Blaise",
""
]
] | We compare the Brown-York (BY) and the standard Misner-Sharp (MS) quasilocal energies for round spheres in spherically symmetric space-times from the point of view of radial geodesics. In particular, we show that the relation between the BY and MS energies is precisely analogous to that between the (relativistic) energ... |
1906.04146 | Muhammed Amir | Md Sabir Ali, Muhammed Amir | Shadow of rotating charged black hole with Weyl corrections | 9 pages, 4 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct theoretical investigation of the black hole shadow for rotating
charged black hole in an asymptotically flat, axisymmetric, and stationary
spacetime with Weyl corrections. This spacetime is characterized by mass ($M$),
charge parameter ($q$), rotation parameter ($a$), and Weyl coupling constant
($\alpha$... | [
{
"created": "Mon, 10 Jun 2019 17:35:31 GMT",
"version": "v1"
}
] | 2019-06-11 | [
[
"Ali",
"Md Sabir",
""
],
[
"Amir",
"Muhammed",
""
]
] | We construct theoretical investigation of the black hole shadow for rotating charged black hole in an asymptotically flat, axisymmetric, and stationary spacetime with Weyl corrections. This spacetime is characterized by mass ($M$), charge parameter ($q$), rotation parameter ($a$), and Weyl coupling constant ($\alpha$).... |
gr-qc/9703035 | A. Mikovic | A. Mikovic and V. Radovanovic | Loop Corrections in the Spectrum of 2D Hawking Radiation | 20 pages, latex, no figures | Class.Quant.Grav.14:2647-2661,1997 | 10.1088/0264-9381/14/9/019 | FTUV-97-11, IFIC-97-11 | gr-qc hep-th | null | We determine the one-loop and the two-loop back-reaction corrections in the
spectrum of the Hawking radiation for the CGHS model of 2d dilaton gravity by
evaluating the Bogoliubov coefficients for a massless scalar field propagating
on the corresponding backgrounds. Since the back-reaction can induce a small
shift in... | [
{
"created": "Fri, 14 Mar 1997 08:08:00 GMT",
"version": "v1"
}
] | 2009-01-16 | [
[
"Mikovic",
"A.",
""
],
[
"Radovanovic",
"V.",
""
]
] | We determine the one-loop and the two-loop back-reaction corrections in the spectrum of the Hawking radiation for the CGHS model of 2d dilaton gravity by evaluating the Bogoliubov coefficients for a massless scalar field propagating on the corresponding backgrounds. Since the back-reaction can induce a small shift in t... |
2408.02917 | Po-Ning Chen | Po-Ning Chen | Near horizon limit of the Wang--Yau quasi-local mass | 14 pages | null | null | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we compute the limit of the Wang--Yau quasi-local mass on a
family of surfaces approaching the apparent horizon (the near horizon limit).
Such limit is first considered in [1]. Recently, Pook-Kolb, Zhao, Andersson,
Krishnan, and Yau investigated the near horizon limit of the Wang--Yau
quasi-local mas... | [
{
"created": "Tue, 6 Aug 2024 03:05:55 GMT",
"version": "v1"
}
] | 2024-08-07 | [
[
"Chen",
"Po-Ning",
""
]
] | In this article, we compute the limit of the Wang--Yau quasi-local mass on a family of surfaces approaching the apparent horizon (the near horizon limit). Such limit is first considered in [1]. Recently, Pook-Kolb, Zhao, Andersson, Krishnan, and Yau investigated the near horizon limit of the Wang--Yau quasi-local mass ... |
0904.3730 | Carlo Rovelli | Davide Mamone, Carlo Rovelli | Second-order amplitudes in loop quantum gravity | 22 pages, 18 figures | Class.Quant.Grav.26:245013,2009 | 10.1088/0264-9381/26/24/245013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore some second-order amplitudes in loop quantum gravity. In
particular, we compute some second-order contributions to diagonal components
of the graviton propagator in the large distance limit, using the old version
of the Barrett-Crane vertex amplitude. We illustrate the geometry associated to
these terms. W... | [
{
"created": "Thu, 23 Apr 2009 16:18:20 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Apr 2009 15:38:36 GMT",
"version": "v2"
}
] | 2010-12-17 | [
[
"Mamone",
"Davide",
""
],
[
"Rovelli",
"Carlo",
""
]
] | We explore some second-order amplitudes in loop quantum gravity. In particular, we compute some second-order contributions to diagonal components of the graviton propagator in the large distance limit, using the old version of the Barrett-Crane vertex amplitude. We illustrate the geometry associated to these terms. We ... |
1210.4106 | Alexandre Le Tiec | Luc Blanchet, David Langlois, Alexandre Le Tiec, Sylvain Marsat | Non-Gaussianity in the Cosmic Microwave Background Induced by Dipolar
Dark Matter | 20 pages; v2: extended discussion in Sec. V D, added references;
matches published version | JCAP 1302:022,2013 | 10.1088/1475-7516/2013/02/022 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In previous work [L. Blanchet and A. Le Tiec, Phys. Rev. D 80, 023524
(2009)], motivated by the phenomenology of dark matter at galactic scales, a
model of dipolar dark matter (DDM) was introduced. At linear order in
cosmological perturbations, the dynamics of the DDM was shown to be identical
to that of standard col... | [
{
"created": "Mon, 15 Oct 2012 17:03:39 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Feb 2013 19:13:01 GMT",
"version": "v2"
}
] | 2013-08-26 | [
[
"Blanchet",
"Luc",
""
],
[
"Langlois",
"David",
""
],
[
"Tiec",
"Alexandre Le",
""
],
[
"Marsat",
"Sylvain",
""
]
] | In previous work [L. Blanchet and A. Le Tiec, Phys. Rev. D 80, 023524 (2009)], motivated by the phenomenology of dark matter at galactic scales, a model of dipolar dark matter (DDM) was introduced. At linear order in cosmological perturbations, the dynamics of the DDM was shown to be identical to that of standard cold ... |
gr-qc/0202058 | Delia Ionescu | Delia Ionescu | Can the notion of a homogeneous gravitational field be transferred from
classical mechanics to the Relativistic Theory of Gravity ? | 12 pages, no figures | Theor.Math.Phys. 130 (2002) 287-297; Teor.Mat.Fiz. 130 (2002)
339-352 | null | null | gr-qc | null | The generalization of the concept of homogeneous gravitational field from
Classical Mechanics was considered in the framework of Einstein's General
Relativity by Bogorodskii. In this paper, I look for such a generalization in
the framework of the Relativistic Theory of Gravitation. There exist a
substantial differenc... | [
{
"created": "Sun, 17 Feb 2002 22:52:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ionescu",
"Delia",
""
]
] | The generalization of the concept of homogeneous gravitational field from Classical Mechanics was considered in the framework of Einstein's General Relativity by Bogorodskii. In this paper, I look for such a generalization in the framework of the Relativistic Theory of Gravitation. There exist a substantial difference ... |
gr-qc/0312014 | Jorma Louko | Jorma Louko, Alberto Molgado | Group averaging in the (p,q) oscillator representation of SL(2,R) | 34 pages. LaTeX with amsfonts, amsmath, amssymb. (References added;
minor typos corrected.) | J.Math.Phys.45:1919-1943,2004 | 10.1063/1.1689001 | null | gr-qc hep-th math-ph math.MP | null | We investigate refined algebraic quantisation with group averaging in a
finite-dimensional constrained Hamiltonian system that provides a simplified
model of general relativity. The classical theory has gauge group SL(2,R) and a
distinguished o(p,q) observable algebra. The gauge group of the quantum theory
is the dou... | [
{
"created": "Tue, 2 Dec 2003 10:08:08 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Jan 2004 17:16:49 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Louko",
"Jorma",
""
],
[
"Molgado",
"Alberto",
""
]
] | We investigate refined algebraic quantisation with group averaging in a finite-dimensional constrained Hamiltonian system that provides a simplified model of general relativity. The classical theory has gauge group SL(2,R) and a distinguished o(p,q) observable algebra. The gauge group of the quantum theory is the doubl... |
2001.11009 | Susana Valdez Alvarado | Susana Valdez-Alvarado, Ricardo Becerril and L. Arturo Ure\~na-L\'opez | Fermion-boson stars with a quartic self-interaction in the boson sector | 12 pages, 16 figures | Phys. Rev. D 102, 064038 (2020) | 10.1103/PhysRevD.102.064038 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Fermion-boson stars are solutions of the gravitationally coupled
Einstein-Klein-Gordon-Hydrodynamic equations system. By means of methods
developed in previous works, we perform a stability analysis of fermion-boson
stars that include a quartic self-interaction in their bosonic part.
Additionally, we describe the com... | [
{
"created": "Wed, 29 Jan 2020 18:37:15 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Oct 2020 18:31:42 GMT",
"version": "v2"
}
] | 2020-10-21 | [
[
"Valdez-Alvarado",
"Susana",
""
],
[
"Becerril",
"Ricardo",
""
],
[
"Ureña-López",
"L. Arturo",
""
]
] | Fermion-boson stars are solutions of the gravitationally coupled Einstein-Klein-Gordon-Hydrodynamic equations system. By means of methods developed in previous works, we perform a stability analysis of fermion-boson stars that include a quartic self-interaction in their bosonic part. Additionally, we describe the compl... |
2407.12947 | Jorge Rocha | Jo\~ao M. Dias, Antonia M. Frassino, David C. Lopes, Valentin D.
Paccoia and Jorge V. Rocha | The impact of higher derivative corrections to General Relativity on
black hole mergers | 12 pages, 9 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The merging of two black holes is a notoriously difficult process to describe
exactly. Nevertheless, the hindrances posed by gravity's nonlinearity can be
circumvented by focusing on the strict extreme mass ratio limit, in which one
of the black holes is infinitely larger than the other. Such an approach has
been dev... | [
{
"created": "Wed, 17 Jul 2024 18:29:30 GMT",
"version": "v1"
}
] | 2024-07-19 | [
[
"Dias",
"João M.",
""
],
[
"Frassino",
"Antonia M.",
""
],
[
"Lopes",
"David C.",
""
],
[
"Paccoia",
"Valentin D.",
""
],
[
"Rocha",
"Jorge V.",
""
]
] | The merging of two black holes is a notoriously difficult process to describe exactly. Nevertheless, the hindrances posed by gravity's nonlinearity can be circumvented by focusing on the strict extreme mass ratio limit, in which one of the black holes is infinitely larger than the other. Such an approach has been devel... |
gr-qc/0411086 | Marco Cavagli\`a | Brett Bolen, Marco Cavaglia | (Anti-)de Sitter Black Hole Thermodynamics and the Generalized
Uncertainty Principle | 10 pages, revtex4 | Gen.Rel.Grav. 37 (2005) 1255-1262 | 10.1007/s10714-005-0108-x | null | gr-qc hep-th | null | We extend the derivation of the Hawking temperature of a Schwarzschild black
hole via the Heisenberg uncertainty principle to the de Sitter and anti-de
Sitter spacetimes. The thermodynamics of the Schwarzschild-(anti-)de Sitter
black holes is obtained from the generalized uncertainty principle of string
theory and no... | [
{
"created": "Wed, 17 Nov 2004 17:19:16 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Bolen",
"Brett",
""
],
[
"Cavaglia",
"Marco",
""
]
] | We extend the derivation of the Hawking temperature of a Schwarzschild black hole via the Heisenberg uncertainty principle to the de Sitter and anti-de Sitter spacetimes. The thermodynamics of the Schwarzschild-(anti-)de Sitter black holes is obtained from the generalized uncertainty principle of string theory and non-... |
1409.4914 | Istvan Racz | Istv\'an R\'acz | Cauchy problem as a two-surface based `geometrodynamics' | 35 pages,no figures, journal reference added | Class. Quantum Grav. 32 (2015) 015006 | 10.1088/0264-9381/32/1/015006 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Four-dimensional spacetimes foliated by a two-parameter family of homologous
two-surfaces are considered in Einstein's theory of gravity. By combining a
1+(1+2) decomposition, the canonical form of the spacetime metric and a
suitable specification of the conformal structure of the foliating two-surfaces
a gauge fixin... | [
{
"created": "Wed, 17 Sep 2014 09:30:25 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Nov 2014 18:56:57 GMT",
"version": "v2"
},
{
"created": "Sat, 6 Dec 2014 11:36:47 GMT",
"version": "v3"
}
] | 2014-12-09 | [
[
"Rácz",
"István",
""
]
] | Four-dimensional spacetimes foliated by a two-parameter family of homologous two-surfaces are considered in Einstein's theory of gravity. By combining a 1+(1+2) decomposition, the canonical form of the spacetime metric and a suitable specification of the conformal structure of the foliating two-surfaces a gauge fixing ... |
gr-qc/0202099 | G. S. Khadekar | G S Khadekar, Vrishali Patki (Department of Mathematics, Nagpur
University, Nagpur-(INDIA)) | De-Sitter Type of Cosmological Model in n-Dimensional Space-Time-Mass
(STM) Theory of Gravitation | Latex 4 pages, no figure | null | null | null | gr-qc | null | Exact solution are obtained for a homogeneous spacially isotropic
cosmological model in a matter free space with or without cosmological consant
for a n-dimensional Kaluza-Klein type of metric in the rest mass varying theory
of gravity proposed by Wesson[1983]. The behavior of the model is discussed.
| [
{
"created": "Thu, 28 Feb 2002 13:10:43 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Khadekar",
"G S",
"",
"Department of Mathematics, Nagpur\n University, Nagpur-"
],
[
"Patki",
"Vrishali",
"",
"Department of Mathematics, Nagpur\n University, Nagpur-"
]
] | Exact solution are obtained for a homogeneous spacially isotropic cosmological model in a matter free space with or without cosmological consant for a n-dimensional Kaluza-Klein type of metric in the rest mass varying theory of gravity proposed by Wesson[1983]. The behavior of the model is discussed. |
1612.01359 | Behnam Pourhassan | Behnam Pourhassan, Mir Faizal, Salvatore Capozziello | Testing Quantum Gravity through Dumb Holes | Accepted for publication in Annals of Physics | Annals Phys. 377 (2017) 108 | 10.1016/j.aop.2016.11.014 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a method to test the effects of quantum fluctuations on black
holes by analyzing the effects of thermal fluctuations on dumb holes, the
analogues for black holes. The proposal is based on the Jacobson formalism,
where the Einstein field equations are viewed as thermodynamical relations, and
so the quantum ... | [
{
"created": "Sun, 27 Nov 2016 08:51:28 GMT",
"version": "v1"
}
] | 2017-02-15 | [
[
"Pourhassan",
"Behnam",
""
],
[
"Faizal",
"Mir",
""
],
[
"Capozziello",
"Salvatore",
""
]
] | We propose a method to test the effects of quantum fluctuations on black holes by analyzing the effects of thermal fluctuations on dumb holes, the analogues for black holes. The proposal is based on the Jacobson formalism, where the Einstein field equations are viewed as thermodynamical relations, and so the quantum fl... |
gr-qc/0405050 | Gary T. Horowitz | Thomas Hertog, Gary T. Horowitz, and Kengo Maeda | Update on Cosmic Censorship Violation in AdS | 5 pages, v2: comment added | null | null | null | gr-qc hep-th | null | We reexamine our proposed counterexample (gr-qc/0307102) to cosmic censorship
in anti de Sitter (AdS) space, and find a gap in the construction. We mention
some possible ways to close the gap, but at present the question of whether
cosmic censorship is violated in AdS remains open.
| [
{
"created": "Mon, 10 May 2004 17:23:27 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Jun 2004 00:17:53 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Hertog",
"Thomas",
""
],
[
"Horowitz",
"Gary T.",
""
],
[
"Maeda",
"Kengo",
""
]
] | We reexamine our proposed counterexample (gr-qc/0307102) to cosmic censorship in anti de Sitter (AdS) space, and find a gap in the construction. We mention some possible ways to close the gap, but at present the question of whether cosmic censorship is violated in AdS remains open. |
1711.08285 | Boris Latosh | D.A.Tretyakova and B.N.Latosh | Scalar-tensor black holes in an expanding universe | 24 pages, accepted to Universe (MDPI) | Universe 2018, 4(2), 26 | 10.3390/universe4020026 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this review we focus our attention on scalar-tensor gravity models and
their empirical verification in terms of black hole and wormhole physics. We
focus on a black hole, embedded in an expanding universe, describing both
cosmological and astrophysical scales. We show that in scalar-tensor gravity it
is quite comm... | [
{
"created": "Wed, 22 Nov 2017 14:03:02 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Dec 2017 11:33:46 GMT",
"version": "v2"
}
] | 2018-02-07 | [
[
"Tretyakova",
"D. A.",
""
],
[
"Latosh",
"B. N.",
""
]
] | In this review we focus our attention on scalar-tensor gravity models and their empirical verification in terms of black hole and wormhole physics. We focus on a black hole, embedded in an expanding universe, describing both cosmological and astrophysical scales. We show that in scalar-tensor gravity it is quite common... |
1502.06290 | Marcus Khuri | Marcus Khuri, Gilbert Weinstein | The Positive Mass Theorem for Multiple Rotating Charged Black Holes | 27 pages; final version | Calc. Var. Partial Differential Equations, 55 (2016), no. 2, 1-29 | null | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper a lower bound for the ADM mass is given in terms of the angular
momenta and charges of black holes present in axisymmetric initial data sets
for the Einstein-Maxwell equations. This generalizes the mass-angular
momentum-charge inequality obtained by Chrusciel and Costa to the case of
multiple black hole... | [
{
"created": "Mon, 23 Feb 2015 00:18:40 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Aug 2016 17:47:03 GMT",
"version": "v2"
}
] | 2016-08-24 | [
[
"Khuri",
"Marcus",
""
],
[
"Weinstein",
"Gilbert",
""
]
] | In this paper a lower bound for the ADM mass is given in terms of the angular momenta and charges of black holes present in axisymmetric initial data sets for the Einstein-Maxwell equations. This generalizes the mass-angular momentum-charge inequality obtained by Chrusciel and Costa to the case of multiple black holes.... |
1611.06936 | Sumanta Chakraborty | Sumanta Chakraborty and Soumitra SenGupta | Strong gravitational lensing --- A probe for extra dimensions and
Kalb-Ramond field | Revised version; 29 pages; 11 figures; 4 tables; published in JCAP | JCAP 07(2017)045 | 10.1088/1475-7516/2017/07/045 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Strong field gravitational lensing in the context of both higher spacetime
dimensions and in presence of Kalb-Ramond field have been studied. After
developing proper analytical tools to analyze the problem we consider
gravitational lensing in three distinct black hole spacetimes --- (a) four
dimensional black hole in... | [
{
"created": "Fri, 18 Nov 2016 01:43:40 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Jul 2017 11:39:43 GMT",
"version": "v2"
}
] | 2017-08-01 | [
[
"Chakraborty",
"Sumanta",
""
],
[
"SenGupta",
"Soumitra",
""
]
] | Strong field gravitational lensing in the context of both higher spacetime dimensions and in presence of Kalb-Ramond field have been studied. After developing proper analytical tools to analyze the problem we consider gravitational lensing in three distinct black hole spacetimes --- (a) four dimensional black hole in p... |
2305.01619 | Haryanto Siahaan | Haryanto M. Siahaan | Spontaneous pair production near magnetized Reissner-Nordstrom black
holes | 10 pages, 3 figures | null | 10.1016/j.physletb.2023.138006 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We investigate the pair production near a (near) extremal magnetized
Reissner-Nordstrom black hole. The pair production is shown to exist in the
extremal state, which can be interpreted as the Schwinger effect due to the
strong field under consideration. To show a correspondence between the growth
of the external mag... | [
{
"created": "Tue, 2 May 2023 17:25:12 GMT",
"version": "v1"
}
] | 2023-06-28 | [
[
"Siahaan",
"Haryanto M.",
""
]
] | We investigate the pair production near a (near) extremal magnetized Reissner-Nordstrom black hole. The pair production is shown to exist in the extremal state, which can be interpreted as the Schwinger effect due to the strong field under consideration. To show a correspondence between the growth of the external magne... |
2211.13659 | Ilya Peshkov M. | Ilya Peshkov and H\'ector Olivares and Evgeniy Romenski | First-order hyperbolic formulation of the pure tetrad teleparallel
gravity theory | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Motivated by numerically solving the Einstein field equations, we derive a
first-order reduction of the second-order $ f(T) $-teleparallel gravity field
equations in the pure-tetrad formulation (no spin connection). We then restrict
our attention to the teleparallel equivalent of general relativity (TEGR) and
propose... | [
{
"created": "Thu, 24 Nov 2022 15:19:46 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Jun 2023 14:57:10 GMT",
"version": "v2"
}
] | 2023-06-23 | [
[
"Peshkov",
"Ilya",
""
],
[
"Olivares",
"Héctor",
""
],
[
"Romenski",
"Evgeniy",
""
]
] | Motivated by numerically solving the Einstein field equations, we derive a first-order reduction of the second-order $ f(T) $-teleparallel gravity field equations in the pure-tetrad formulation (no spin connection). We then restrict our attention to the teleparallel equivalent of general relativity (TEGR) and propose a... |
2210.08621 | Daniil Krichevskiy | Svetlana Andrusenko, Yurii Gavriluk, Andrei Gusev, Daniil Krichevskiy,
Sergei Oreshkin, Sergei Popov and Valentin Rudenko | Search for gravitational-neutrino correlations on ground-based detectors | null | Universe 2022, 8(9), 446 | 10.3390/universe8090446 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The problem of joint data processing from ground-based gravitational and
neutrino detectors is considered in order to increase the detection efficiency
of collapsing objects in the Galaxy. The development of the "neutrino -
gravitational correlation" algorithm is carried out within the framework of the
theory of opti... | [
{
"created": "Sun, 16 Oct 2022 19:29:08 GMT",
"version": "v1"
}
] | 2022-10-18 | [
[
"Andrusenko",
"Svetlana",
""
],
[
"Gavriluk",
"Yurii",
""
],
[
"Gusev",
"Andrei",
""
],
[
"Krichevskiy",
"Daniil",
""
],
[
"Oreshkin",
"Sergei",
""
],
[
"Popov",
"Sergei",
""
],
[
"Rudenko",
"Valentin",
""
... | The problem of joint data processing from ground-based gravitational and neutrino detectors is considered in order to increase the detection efficiency of collapsing objects in the Galaxy. The development of the "neutrino - gravitational correlation" algorithm is carried out within the framework of the theory of optima... |
gr-qc/0305083 | Oliver Preuss | Oliver Preuss | Astronomical Tests of the Einstein Equivalence Principle | PhD thesis, written at the Max-Planck-Institute for Aeronomy,
Germany. A high resolution postscript version can be found at
http://archiv.ub.uni-bielefeld.de/disshabi/2002/0106.ps | null | null | null | gr-qc astro-ph | null | The Einstein equivalence principle is certainly a key element in the
development of new enhanced theories of gravity. Although being an important
building block in Einstein's general relativity, theoretically predicted
violations of its validity are a main feature in alternative, nonmetric
gravitation theories if the... | [
{
"created": "Thu, 22 May 2003 16:43:32 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Preuss",
"Oliver",
""
]
] | The Einstein equivalence principle is certainly a key element in the development of new enhanced theories of gravity. Although being an important building block in Einstein's general relativity, theoretically predicted violations of its validity are a main feature in alternative, nonmetric gravitation theories if they ... |
1104.1942 | Mariafelicia De Laurentis | Mariafelicia De Laurentis, Salvatore Capozziello | Quadrupolar gravitational radiation as a test-bed for f(R)-gravity | 13 pages, 1 figure | Astroparticle Physics 35, 5, 257-265 (2011) | 10.1016/j.astropartphys.2011.08.006 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The debate concerning the viability of f(R)-gravity as a natural extension of
General Relativity could be realistically addressed by using results coming
from binary pulsars like PSR 1913+16. To this end, we develop a quadrupolar
approach to the gravitational radiation for a class of ana- lytic f(R)-models.
We show t... | [
{
"created": "Mon, 11 Apr 2011 13:32:05 GMT",
"version": "v1"
}
] | 2014-11-13 | [
[
"De Laurentis",
"Mariafelicia",
""
],
[
"Capozziello",
"Salvatore",
""
]
] | The debate concerning the viability of f(R)-gravity as a natural extension of General Relativity could be realistically addressed by using results coming from binary pulsars like PSR 1913+16. To this end, we develop a quadrupolar approach to the gravitational radiation for a class of ana- lytic f(R)-models. We show tha... |
2205.07255 | Jan Harms | Jan Harms | Seismic Background Limitation of Lunar Gravitational-wave Detectors | 5 pages, 1 figure | Physical Review Letters 129, 071102 (2022) | 10.1103/PhysRevLett.129.071102 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New concepts were recently proposed for gravitational-wave (GW) detectors on
the Moon. These include laser-interferometric detectors, proposed as free-range
or optical-fiber interferometers, and inertial acceleration sensors. Some of
them exploit the response of the Moon to GWs, others follow the design of
current la... | [
{
"created": "Sun, 15 May 2022 10:45:54 GMT",
"version": "v1"
}
] | 2022-08-29 | [
[
"Harms",
"Jan",
""
]
] | New concepts were recently proposed for gravitational-wave (GW) detectors on the Moon. These include laser-interferometric detectors, proposed as free-range or optical-fiber interferometers, and inertial acceleration sensors. Some of them exploit the response of the Moon to GWs, others follow the design of current lase... |
1004.2520 | Francisco Lobo | Francisco S. N. Lobo, Remo Garattini | Linearized stability analysis of gravastars in noncommutative geometry | 6 pages, 3 figures | JHEP 1312 (2013) 065 | 10.1007/JHEP12(2013)065 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we find exact gravastar solutions in the context of
noncommutative geometry, and explore their physical properties and
characteristics. The energy density of these geometries is a smeared and
particle-like gravitational source, where the mass is diffused throughout a
region of linear dimension $\sqrt{(\... | [
{
"created": "Wed, 14 Apr 2010 22:58:27 GMT",
"version": "v1"
}
] | 2013-12-16 | [
[
"Lobo",
"Francisco S. N.",
""
],
[
"Garattini",
"Remo",
""
]
] | In this work, we find exact gravastar solutions in the context of noncommutative geometry, and explore their physical properties and characteristics. The energy density of these geometries is a smeared and particle-like gravitational source, where the mass is diffused throughout a region of linear dimension $\sqrt{(\al... |
1612.00149 | Sumati Surya | Ian Jubb, Joseph Samuel, Rafael Sorkin and Sumati Surya | Boundary and Corner Terms in the Action for General Relativity | Latex, 22 pages, 5 figures. Minor revisions and corrections and some
clarifications in the text | null | 10.1088/1361-6382/aa6014 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the action principle for general relativity motivated by the path
integral approach to quantum gravity. We consider a spacetime region whose
boundary has piecewise $C^2$ components, each of which can be spacelike,
timelike or null and consider metric variations in which only the pullback of
the metric to t... | [
{
"created": "Thu, 1 Dec 2016 05:09:08 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Feb 2017 15:46:08 GMT",
"version": "v2"
}
] | 2017-03-15 | [
[
"Jubb",
"Ian",
""
],
[
"Samuel",
"Joseph",
""
],
[
"Sorkin",
"Rafael",
""
],
[
"Surya",
"Sumati",
""
]
] | We revisit the action principle for general relativity motivated by the path integral approach to quantum gravity. We consider a spacetime region whose boundary has piecewise $C^2$ components, each of which can be spacelike, timelike or null and consider metric variations in which only the pullback of the metric to the... |
1302.3048 | Josep Llosa | Josep Llosa | Matter and Ricci collineations | null | Journal of Mathematical Physics 54 (2013) 072501 | 10.1063/1.4813475 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The infinitesimal transformations that leave invariant a two-covariant
symmetric tensor are studied. The interest of these symmetry transformations
lays in the fact that this class of tensors includes the energy-momentum and
Ricci tensors. We find that in most cases the class of infinitesimal generators
of these tran... | [
{
"created": "Wed, 13 Feb 2013 10:52:16 GMT",
"version": "v1"
}
] | 2017-11-22 | [
[
"Llosa",
"Josep",
""
]
] | The infinitesimal transformations that leave invariant a two-covariant symmetric tensor are studied. The interest of these symmetry transformations lays in the fact that this class of tensors includes the energy-momentum and Ricci tensors. We find that in most cases the class of infinitesimal generators of these transf... |
gr-qc/0607050 | Eric Gourgoulhon | Eric Gourgoulhon and Jose Luis Jaramillo (LUTH, Observatoire de Paris) | Area evolution, bulk viscosity and entropy principles for dynamical
horizons | Some references added, 5 pages, Phys. Rev. D, in press | Phys.Rev. D74 (2006) 087502 | 10.1103/PhysRevD.74.087502 | null | gr-qc astro-ph | null | We derive from Einstein equation an evolution law for the area of a trapping
or dynamical horizon. The solutions to this differential equation show a causal
behavior. Moreover, in a viscous fluid analogy, the equation can be interpreted
as an energy balance law, yielding to a positive bulk viscosity. These two
featur... | [
{
"created": "Wed, 12 Jul 2006 14:24:13 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Sep 2006 07:40:40 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Gourgoulhon",
"Eric",
"",
"LUTH, Observatoire de Paris"
],
[
"Jaramillo",
"Jose Luis",
"",
"LUTH, Observatoire de Paris"
]
] | We derive from Einstein equation an evolution law for the area of a trapping or dynamical horizon. The solutions to this differential equation show a causal behavior. Moreover, in a viscous fluid analogy, the equation can be interpreted as an energy balance law, yielding to a positive bulk viscosity. These two features... |
1501.04591 | Daniela Doneva | Stoytcho S. Yazadjiev, Daniela D. Doneva, Kostas D. Kokkotas | Rapidly rotating neutron stars in $R$-squared gravity | 8 pages, 2 figures, 1 table | null | 10.1103/PhysRevD.91.084018 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | $f(R)$ theories of gravity are one of the most popular alternative
explanations for dark energy and therefore studying the possible astrophysical
implications of these theories is an important task. In the present paper we
make a substantial advance in this direction by considering rapidly rotating
neutron stars in $... | [
{
"created": "Mon, 19 Jan 2015 19:05:59 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Yazadjiev",
"Stoytcho S.",
""
],
[
"Doneva",
"Daniela D.",
""
],
[
"Kokkotas",
"Kostas D.",
""
]
] | $f(R)$ theories of gravity are one of the most popular alternative explanations for dark energy and therefore studying the possible astrophysical implications of these theories is an important task. In the present paper we make a substantial advance in this direction by considering rapidly rotating neutron stars in $R^... |
2312.11552 | Yao-guang Zheng | Wen-Xiang Chen, Yao-Guang Zheng | Refined Perspectives on the Kerr-Schild Double Copy:Harmonizing Gravity
and Electromagnetism in Metric Formulations | 10 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper explores the Kerr-Schild double copy, a duality relating gravity
and electromagnetism. We show how Einstein's vacuum solutions in four
dimensions can be converted into Maxwell's solutions via a double copy
procedure, employing tensor fields. This technique yields novel solutions to
Einstein's equations, in... | [
{
"created": "Sun, 17 Dec 2023 05:30:19 GMT",
"version": "v1"
}
] | 2023-12-20 | [
[
"Chen",
"Wen-Xiang",
""
],
[
"Zheng",
"Yao-Guang",
""
]
] | This paper explores the Kerr-Schild double copy, a duality relating gravity and electromagnetism. We show how Einstein's vacuum solutions in four dimensions can be converted into Maxwell's solutions via a double copy procedure, employing tensor fields. This technique yields novel solutions to Einstein's equations, incl... |
1812.10314 | Benjamin Bahr | Benjamin Bahr | Non-convex 4d polytopes in Spin Foam Models | 25 pages, 17 figures (14 images, 3 tables) | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we consider non-convex $4d$ polytopes in $\mathbb{R}^4$. The
paper consist of two parts: Firstly, we extend the proof of the formula for the
$4d$ volume in terms of $2d$ face bivectors and boundary graph crossings from
convex to non-convex polytopes. Secondly, we consider the EPRL-FK spin foam
model, ... | [
{
"created": "Wed, 26 Dec 2018 13:50:04 GMT",
"version": "v1"
}
] | 2018-12-27 | [
[
"Bahr",
"Benjamin",
""
]
] | In this article we consider non-convex $4d$ polytopes in $\mathbb{R}^4$. The paper consist of two parts: Firstly, we extend the proof of the formula for the $4d$ volume in terms of $2d$ face bivectors and boundary graph crossings from convex to non-convex polytopes. Secondly, we consider the EPRL-FK spin foam model, an... |
1503.07835 | Borja Reina | Borja Reina | Slowly rotating homogeneous masses revisited | 12 pages, 2 figures | null | 10.1093/mnras/stv2599 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hartle's model for slowly rotating stars has been extensively used to compute
equilibrium configurations of slowly rotating stars to second order in
perturbation theory in General Relativity, given a barotropic equation of state
(EOS). A recent study based on the modern theory of perturbed matchings show
that the mod... | [
{
"created": "Thu, 26 Mar 2015 19:26:21 GMT",
"version": "v1"
}
] | 2015-12-16 | [
[
"Reina",
"Borja",
""
]
] | Hartle's model for slowly rotating stars has been extensively used to compute equilibrium configurations of slowly rotating stars to second order in perturbation theory in General Relativity, given a barotropic equation of state (EOS). A recent study based on the modern theory of perturbed matchings show that the model... |
2007.16066 | Martin Bojowald | Martin Bojowald | A no-go result for covariance in models of loop quantum gravity | 14 pages | Phys. Rev D. 102 (2020) 046006 | 10.1103/PhysRevD.102.046006 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on the observation that the exterior space-times of Schwarzschild-type
solutions allow two symmetric slicings, a static spherically symmetric one and
a timelike homogeneous one, modifications of gravitational dynamics suggested
by symmetry-reduced models of quantum cosmology can be used to derive
corresponding ... | [
{
"created": "Fri, 31 Jul 2020 13:31:32 GMT",
"version": "v1"
}
] | 2020-08-11 | [
[
"Bojowald",
"Martin",
""
]
] | Based on the observation that the exterior space-times of Schwarzschild-type solutions allow two symmetric slicings, a static spherically symmetric one and a timelike homogeneous one, modifications of gravitational dynamics suggested by symmetry-reduced models of quantum cosmology can be used to derive corresponding mo... |
2403.02351 | Miguel Socolovsky | Josu\'e G. Mateos Trujillo and Miguel Socolovsky | Principal equatorial null geodesic congruences in the Kerr metric, and
their quantum propagators | 8 pages, 2 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Using the Raychaudhuri equation, we associate quantum probability amplitudes
(propagators) to equatorial principal ingoing and outgoing null geodesic
congruences in the Kerr metric. The expansion scalars diverge at the ring
singularity; however, the propagators remain finite, which is an indication
that at the quantu... | [
{
"created": "Fri, 1 Mar 2024 16:10:55 GMT",
"version": "v1"
}
] | 2024-03-06 | [
[
"Trujillo",
"Josué G. Mateos",
""
],
[
"Socolovsky",
"Miguel",
""
]
] | Using the Raychaudhuri equation, we associate quantum probability amplitudes (propagators) to equatorial principal ingoing and outgoing null geodesic congruences in the Kerr metric. The expansion scalars diverge at the ring singularity; however, the propagators remain finite, which is an indication that at the quantum ... |
1907.12695 | Jorge Noronha | F\'abio S. Bemfica (Rio Grande do Norte U.), Marcelo M. Disconzi
(Vanderbilt U.), Jorge Noronha (Illinois U., Urbana) | Nonlinear causality of general first-order relativistic viscous
hydrodynamics | 28 pages, 2 appendices, version published in Phys. Rev. D; Eq. (7d)
has been added and Eq. (11a) has been fixed | Phys. Rev. D 100, 104020 (2019) | 10.1103/PhysRevD.100.104020 | null | gr-qc hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Effective theory arguments are used to derive the most general
energy-momentum tensor of a relativistic viscous fluid with an arbitrary
equation of state (in the absence of other conserved currents) that is
first-order in the derivatives of the energy density and flow velocity and does
not include extended variables ... | [
{
"created": "Tue, 30 Jul 2019 01:29:49 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Nov 2019 20:38:34 GMT",
"version": "v2"
},
{
"created": "Mon, 21 Feb 2022 16:51:06 GMT",
"version": "v3"
}
] | 2022-02-22 | [
[
"Bemfica",
"Fábio S.",
"",
"Rio Grande do Norte U."
],
[
"Disconzi",
"Marcelo M.",
"",
"Vanderbilt U."
],
[
"Noronha",
"Jorge",
"",
"Illinois U., Urbana"
]
] | Effective theory arguments are used to derive the most general energy-momentum tensor of a relativistic viscous fluid with an arbitrary equation of state (in the absence of other conserved currents) that is first-order in the derivatives of the energy density and flow velocity and does not include extended variables su... |
1801.05664 | Maximilian Thaller | Maximilian Thaller | Existence of Static Solutions of the Einstein-Vlasov-Maxwell System and
the Thin Shell Limit | 27 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article the static Einstein-Vlasov-Maxwell system is considered in
spherical symmetry. This system describes an ensemble of charged particles
interacting by general relativistic gravity and Coulomb forces. First, a proof
for local existence of solutions around the center of symmetry is given. Then,
by virtue ... | [
{
"created": "Wed, 17 Jan 2018 13:59:06 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Oct 2019 12:43:40 GMT",
"version": "v2"
}
] | 2019-10-09 | [
[
"Thaller",
"Maximilian",
""
]
] | In this article the static Einstein-Vlasov-Maxwell system is considered in spherical symmetry. This system describes an ensemble of charged particles interacting by general relativistic gravity and Coulomb forces. First, a proof for local existence of solutions around the center of symmetry is given. Then, by virtue of... |
2403.20311 | Roman Berens | Roman Berens, Trevor Gravely, Alexandru Lupsasca | Gravitational Waves on Kerr Black Holes I: Reconstruction of Linearized
Metric Perturbations | 53 pages, no figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitational perturbations of a rotating Kerr black hole are notoriously
complicated, even at the linear level. In 1973, Teukolsky showed that their
physical degrees of freedom are encoded in two gauge-invariant Weyl curvature
scalars that obey a separable wave equation. Determining these scalars is
sufficient f... | [
{
"created": "Fri, 29 Mar 2024 17:32:15 GMT",
"version": "v1"
}
] | 2024-04-01 | [
[
"Berens",
"Roman",
""
],
[
"Gravely",
"Trevor",
""
],
[
"Lupsasca",
"Alexandru",
""
]
] | The gravitational perturbations of a rotating Kerr black hole are notoriously complicated, even at the linear level. In 1973, Teukolsky showed that their physical degrees of freedom are encoded in two gauge-invariant Weyl curvature scalars that obey a separable wave equation. Determining these scalars is sufficient for... |
2104.07506 | Jianping Hu | Jian-Ping Hu, Yu Zhang, Li-Li Shi, Peng-Fei Duan | Structure of geodesics in the regular Hayward black hole space-time | 19 pages,16 figures | General Relativity and Gravitation,2018, 50, 89 | 10.1007/s10714-018-2411-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The regular Hayward model describes a non-singular black hole space-time. By
analyzing the behaviors of effective potential and solving the equation of
orbital motion, we investigate the time-like and null geodesics in the regular
Hayward black hole space-time. Through detailed analyses of corresponding
effective pot... | [
{
"created": "Thu, 15 Apr 2021 15:04:37 GMT",
"version": "v1"
}
] | 2021-04-16 | [
[
"Hu",
"Jian-Ping",
""
],
[
"Zhang",
"Yu",
""
],
[
"Shi",
"Li-Li",
""
],
[
"Duan",
"Peng-Fei",
""
]
] | The regular Hayward model describes a non-singular black hole space-time. By analyzing the behaviors of effective potential and solving the equation of orbital motion, we investigate the time-like and null geodesics in the regular Hayward black hole space-time. Through detailed analyses of corresponding effective poten... |
2009.03399 | Mohsen Fathi | Mohsen Fathi, Mona Kariminezhad, Marco Olivares, J.R. Villanueva | Motion of massive particles around a charged Weyl black hole and the
geodetic precession of orbiting gyroscopes | 22 pages, 15 figures | Eur. Phys. J. C 80, 377 (2020) | 10.1140/epjc/s10052-020-7945-3 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The advanced state of cosmological observations constantly tests the
alternative theories of gravity that originate from Einstein's theory. However,
this is not restricted to modifications to general relativity. In this sense,
we work in the context of Weyl's theory, more specifically, on a particular
black hole solu... | [
{
"created": "Mon, 7 Sep 2020 20:10:04 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Sep 2020 12:38:36 GMT",
"version": "v2"
},
{
"created": "Mon, 9 Nov 2020 15:48:17 GMT",
"version": "v3"
}
] | 2020-11-10 | [
[
"Fathi",
"Mohsen",
""
],
[
"Kariminezhad",
"Mona",
""
],
[
"Olivares",
"Marco",
""
],
[
"Villanueva",
"J. R.",
""
]
] | The advanced state of cosmological observations constantly tests the alternative theories of gravity that originate from Einstein's theory. However, this is not restricted to modifications to general relativity. In this sense, we work in the context of Weyl's theory, more specifically, on a particular black hole soluti... |
2307.04803 | Alejandro Jenkins | Robert Alicki, Gabriela Barenboim and Alejandro Jenkins | The irreversible relaxation of inflation | 7 pages, 3 figures. v3: added new section on analogy to
superfluorescence; Fig. 2 improved; manuscript now more self-contained, some
points clarified, references improved | null | null | IFIC/23-29 | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on the results of a previous analysis of the Markovian master equation
for the irreversible evolution of an open system embedded in de Sitter space,
we include in the cosmological Friedmann equations a contribution from the
presence of a physical bath at temperature $T_{\rm dS} = h / 2 \pi$, where $h$
is the Hu... | [
{
"created": "Mon, 10 Jul 2023 18:00:19 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Jul 2023 15:22:57 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Dec 2023 19:03:39 GMT",
"version": "v3"
}
] | 2023-12-25 | [
[
"Alicki",
"Robert",
""
],
[
"Barenboim",
"Gabriela",
""
],
[
"Jenkins",
"Alejandro",
""
]
] | Based on the results of a previous analysis of the Markovian master equation for the irreversible evolution of an open system embedded in de Sitter space, we include in the cosmological Friedmann equations a contribution from the presence of a physical bath at temperature $T_{\rm dS} = h / 2 \pi$, where $h$ is the Hubb... |
0808.0160 | David Garfinkle | David Garfinkle | Numerical simulations of general gravitational singularities | This work was part of the 2006 AEI conference on New Frontiers in
Numerical Relativity and was published in an issue of Classical and Quantum
Gravity on that conference | Class.Quant.Grav.24:S295-S306,2007 | 10.1088/0264-9381/24/12/S19 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper covers some of the current techniques and issues involved in
performing numerical simulations of the formation of singularities.
| [
{
"created": "Fri, 1 Aug 2008 17:49:41 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Garfinkle",
"David",
""
]
] | This paper covers some of the current techniques and issues involved in performing numerical simulations of the formation of singularities. |
gr-qc/0403055 | Morteza Mohseni | Morteza Mohseni | World-line deviation and spinning particles | 5 pages, no figures, to appear in Physics Letters B | Phys.Lett. B587 (2004) 133-137 | 10.1016/j.physletb.2004.02.059 | IPM/P-2004/012 | gr-qc | null | A set of world-line deviation equations is derived in the framework of
Mathisson-Papapetrou-Dixon description of pseudo-classical spinning particles.
They generalize the geodesic deviation equations. We examine the resulting
equations for particles moving in the space-time of a plane gravitational wave.
| [
{
"created": "Sat, 13 Mar 2004 09:50:26 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mohseni",
"Morteza",
""
]
] | A set of world-line deviation equations is derived in the framework of Mathisson-Papapetrou-Dixon description of pseudo-classical spinning particles. They generalize the geodesic deviation equations. We examine the resulting equations for particles moving in the space-time of a plane gravitational wave. |
gr-qc/0003112 | Massimo Giovannini | Massimo Giovannini (Institute for Theoretical Physics, Lausanne
University) | Homogeneous magnetic fields in fully anisotropic string cosmological
backgrounds | 4 pages | Phys.Rev. D62 (2000) 067301 | 10.1103/PhysRevD.62.067301 | UNIL-IPT/2000-07 | gr-qc | null | We present new solutions of the string cosmological effective action in the
presence of a homogeneous Maxwell field with pure magnetic component. Exact
solutions are derived in the case of space-independent dilaton and vanishing
torsion background. In our examples the four dimensional metric is either of
Bianchi-type... | [
{
"created": "Thu, 30 Mar 2000 16:18:23 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Giovannini",
"Massimo",
"",
"Institute for Theoretical Physics, Lausanne\n University"
]
] | We present new solutions of the string cosmological effective action in the presence of a homogeneous Maxwell field with pure magnetic component. Exact solutions are derived in the case of space-independent dilaton and vanishing torsion background. In our examples the four dimensional metric is either of Bianchi-type I... |
2105.09172 | Tapobrata Sarkar | Pritam Banerjee, Debojyoti Garain, Suvankar Paul, Rajibul Shaikh,
Tapobrata Sarkar | A stellar constraint on Eddington-inspired Born-Infeld gravity from
cataclysmic variable binaries | 11 Pages, 3 Figures | null | 10.3847/1538-4357/ac324f | null | gr-qc astro-ph.SR hep-th | http://creativecommons.org/licenses/by/4.0/ | Eddington-inspired Born-Infeld gravity is an important modification of
Einstein's general relativity, which can give rise to non-singular cosmologies
at the classical level, and avoid the end-stage singularity in a gravitational
collapse process. In the Newtonian limit, this theory gives rise to a modified
Poisson's ... | [
{
"created": "Wed, 19 May 2021 14:43:37 GMT",
"version": "v1"
}
] | 2022-01-12 | [
[
"Banerjee",
"Pritam",
""
],
[
"Garain",
"Debojyoti",
""
],
[
"Paul",
"Suvankar",
""
],
[
"Shaikh",
"Rajibul",
""
],
[
"Sarkar",
"Tapobrata",
""
]
] | Eddington-inspired Born-Infeld gravity is an important modification of Einstein's general relativity, which can give rise to non-singular cosmologies at the classical level, and avoid the end-stage singularity in a gravitational collapse process. In the Newtonian limit, this theory gives rise to a modified Poisson's eq... |
2202.00043 | Guilherme Raposo | Artur Alho, Jos\'e Nat\'ario, Paolo Pani, Guilherme Raposo | Compactness bounds in General Relativity | v2: 4 pages, 4 figures; Version submitted to PRD: Major revision
extending the class of elastic materials to describe rigid materials beyond
spherical-symmetry. Bounds on the compactness modified accordingly but
discussion qualitatively similar to the previous version | null | 10.1103/PhysRevD.106.L041502 | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A foundational theorem due to Buchdahl states that, within General Relativity
(GR), the maximum compactness $\mathcal{C}\equiv GM/(Rc^2)$ of a static,
spherically symmetric, perfect fluid object of mass $M$ and radius $R$ is
$\mathcal{C}=4/9$. As a corollary, there exists a compactness gap between
perfect fluid stars... | [
{
"created": "Mon, 31 Jan 2022 19:08:47 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jul 2022 11:44:20 GMT",
"version": "v2"
}
] | 2022-08-17 | [
[
"Alho",
"Artur",
""
],
[
"Natário",
"José",
""
],
[
"Pani",
"Paolo",
""
],
[
"Raposo",
"Guilherme",
""
]
] | A foundational theorem due to Buchdahl states that, within General Relativity (GR), the maximum compactness $\mathcal{C}\equiv GM/(Rc^2)$ of a static, spherically symmetric, perfect fluid object of mass $M$ and radius $R$ is $\mathcal{C}=4/9$. As a corollary, there exists a compactness gap between perfect fluid stars a... |
gr-qc/0203020 | Edward Porter | Edward K. Porter | Computational Resources to Filter Gravitational Wave Data with
P-approximant Templates | 17 pages, 8 figures, Submitted to Class.Quant.Grav | Class.Quant.Grav. 19 (2002) 4343-4360 | 10.1088/0264-9381/19/16/309 | null | gr-qc | null | The prior knowledge of the gravitational waveform from compact binary systems
makes matched filtering an attractive detection strategy. This detection method
involves the filtering of the detector output with a set of theoretical
waveforms or templates. One of the most important factors in this strategy is
knowing ho... | [
{
"created": "Wed, 6 Mar 2002 13:15:14 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Porter",
"Edward K.",
""
]
] | The prior knowledge of the gravitational waveform from compact binary systems makes matched filtering an attractive detection strategy. This detection method involves the filtering of the detector output with a set of theoretical waveforms or templates. One of the most important factors in this strategy is knowing how ... |
1507.04496 | Seiju Ohashi | Seiju Ohashi and Masato Nozawa | Lovelock black holes with non-constant curvature horizon | 17 pages, Published version | Phys. Rev. D 92, 064020 (2015) | 10.1103/PhysRevD.92.064020 | KEK-TH-1850, IFUM-1043-FT | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper studies a class of $D=n+2(\ge 6)$ dimensional solutions to
Lovelock gravity that is described by the warped product of a two-dimensional
Lorentzian metric and an $n$-dimensional Einstein space. Assuming that the
angular part of the stress-energy tensor is proportional to the Einstein
metric, it turns out t... | [
{
"created": "Thu, 16 Jul 2015 09:21:33 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Oct 2015 04:33:41 GMT",
"version": "v2"
}
] | 2015-10-27 | [
[
"Ohashi",
"Seiju",
""
],
[
"Nozawa",
"Masato",
""
]
] | This paper studies a class of $D=n+2(\ge 6)$ dimensional solutions to Lovelock gravity that is described by the warped product of a two-dimensional Lorentzian metric and an $n$-dimensional Einstein space. Assuming that the angular part of the stress-energy tensor is proportional to the Einstein metric, it turns out tha... |
1401.1337 | Tomas Ledvinka | Jakub Hal\'a\v{c}ek and Tom\'a\v{s} Ledvinka | Analytic conformal compactification of Schwarzschild spacetime | null | Class. Quantum Grav. 31 (2014) 015007 | 10.1088/0264-9381/31/1/015007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Among the coordinates used to construct a conformal compactification of the
Schwarzschild spacetime, none of them simultaneously extend smoothly both
through an event horizon and beyond null infinity.To construct such
coordinates, instead of starting with the Kruskal-Szekeres coordinates we
assume direct analytic tra... | [
{
"created": "Tue, 7 Jan 2014 10:52:39 GMT",
"version": "v1"
}
] | 2014-01-08 | [
[
"Haláček",
"Jakub",
""
],
[
"Ledvinka",
"Tomáš",
""
]
] | Among the coordinates used to construct a conformal compactification of the Schwarzschild spacetime, none of them simultaneously extend smoothly both through an event horizon and beyond null infinity.To construct such coordinates, instead of starting with the Kruskal-Szekeres coordinates we assume direct analytic trans... |
1005.0960 | Gergely Sz\'ekely | Hajnal Andr\'eka, Judit X. Madar\'asz, Istv\'an N\'emeti and Gergely
Sz\'ekely | A logic road from special relativity to general relativity | null | Synthese Volume 186, Number 3 (2012), 633-649 | 10.1007/s11229-011-9914-8 | null | gr-qc math-ph math.LO math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a streamlined axiom system of special relativity in first-order
logic. From this axiom system we "derive" an axiom system of general relativity
in two natural steps. We will also see how the axioms of special relativity
transform into those of general relativity. This way we hope to make general
relativity... | [
{
"created": "Thu, 6 May 2010 10:07:45 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Jan 2011 12:17:17 GMT",
"version": "v2"
}
] | 2012-11-19 | [
[
"Andréka",
"Hajnal",
""
],
[
"Madarász",
"Judit X.",
""
],
[
"Németi",
"István",
""
],
[
"Székely",
"Gergely",
""
]
] | We present a streamlined axiom system of special relativity in first-order logic. From this axiom system we "derive" an axiom system of general relativity in two natural steps. We will also see how the axioms of special relativity transform into those of general relativity. This way we hope to make general relativity m... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.