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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/0302075 | Yasushi Mino | Yasushi Mino | Perturbative Approach to an orbital evolution around a Supermassive
black hole | accepted for publication in the Physical Review | Phys.Rev. D67 (2003) 084027 | 10.1103/PhysRevD.67.084027 | null | gr-qc | null | A charge-free, point particle of infinitesimal mass orbiting a Kerr black
hole is known to move along a geodesic. When the particle has a finite mass or
charge, it emits radiation which carries away orbital energy and angular
momentum, and the orbit deviates from a geodesic.
In this paper we assume that the deviati... | [
{
"created": "Tue, 18 Feb 2003 17:34:03 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Mino",
"Yasushi",
""
]
] | A charge-free, point particle of infinitesimal mass orbiting a Kerr black hole is known to move along a geodesic. When the particle has a finite mass or charge, it emits radiation which carries away orbital energy and angular momentum, and the orbit deviates from a geodesic. In this paper we assume that the deviation i... |
1303.0194 | Mohd. Shahalam | R. Myrzakulov, M. Shahalam | Statefinder hierarchy of bimetric and galileon models for concordance
cosmology | 15 pages, 8 figures, LaTeX, some texts, Refs. added, to appear in
JCAP | JCAP 10 (2013) 047 | 10.1088/1475-7516/2013/10/047 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we use Statefinder hierarchy method to distinguish between
bimetric theory of massive gravity, galileon modified gravity and DGP models
applied to late time expansion of the universe. We also carry out comparison
between bimetric and DGP models using Statefinder pairs {r, s} and {r, q}. We
show that st... | [
{
"created": "Thu, 28 Feb 2013 06:10:43 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Jun 2013 07:40:27 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Oct 2013 10:35:59 GMT",
"version": "v3"
}
] | 2013-10-28 | [
[
"Myrzakulov",
"R.",
""
],
[
"Shahalam",
"M.",
""
]
] | In this paper, we use Statefinder hierarchy method to distinguish between bimetric theory of massive gravity, galileon modified gravity and DGP models applied to late time expansion of the universe. We also carry out comparison between bimetric and DGP models using Statefinder pairs {r, s} and {r, q}. We show that stat... |
2307.04572 | Federico Schianchi | Federico Schianchi, Henrique Gieg, Vsevolod Nedora, Anna Neuweiler,
Maximiliano Ujevic, Mattia Bulla, Tim Dietrich | M1 neutrino transport within the numerical-relativistic code BAM with
application to low mass binary neutron star mergers | 29 pages, 27 figures | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutrino interactions are essential for an accurate understanding of the
binary neutron star merger process. In this article, we extend the code
infrastructure of the well-established numerical-relativity code BAM that until
recently neglected neutrino-driven interactions. In fact, while previous work
allowed already... | [
{
"created": "Mon, 10 Jul 2023 14:06:59 GMT",
"version": "v1"
}
] | 2023-07-11 | [
[
"Schianchi",
"Federico",
""
],
[
"Gieg",
"Henrique",
""
],
[
"Nedora",
"Vsevolod",
""
],
[
"Neuweiler",
"Anna",
""
],
[
"Ujevic",
"Maximiliano",
""
],
[
"Bulla",
"Mattia",
""
],
[
"Dietrich",
"Tim",
""
]
... | Neutrino interactions are essential for an accurate understanding of the binary neutron star merger process. In this article, we extend the code infrastructure of the well-established numerical-relativity code BAM that until recently neglected neutrino-driven interactions. In fact, while previous work allowed already t... |
2311.06881 | David Garfinkle | George F R Ellis and David Garfinkle | The Synge G-Method: cosmology, wormholes, firewalls, geometry | null | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Unphysical equations of state result from the unrestricted use of the Synge
G-trick of running the Einstein field equations backwards; in particular often
this results in $\rho + p < 0$ which implies negative inertial mass density,
which does not occur in reality. This is the basis of some unphysical spacetime
models... | [
{
"created": "Sun, 12 Nov 2023 16:05:38 GMT",
"version": "v1"
}
] | 2023-11-17 | [
[
"Ellis",
"George F R",
""
],
[
"Garfinkle",
"David",
""
]
] | Unphysical equations of state result from the unrestricted use of the Synge G-trick of running the Einstein field equations backwards; in particular often this results in $\rho + p < 0$ which implies negative inertial mass density, which does not occur in reality. This is the basis of some unphysical spacetime models i... |
1606.00758 | Muhammad Sharif | M. Sharif and Rubab Manzoor | Dynamics of Axial Symmetric System in Self-Interacting Brans-Dicke
Gravity | 24 pages, no figure, accepted for publication in publication in Eur.
Phys. J. C | Eur. Phys. J. C 76(2016)330 | 10.1140/epjc/s10052-016-4161-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper investigates dynamics of axial reflection symmetric model in
self-interacting Brans-Dicke gravity for anisotropic fluid. We formulate
hydrodynamical equations and discuss oscillations using time-dependent
perturbation for both spin as well as spin-independent cases. The expressions
of frequency, total ener... | [
{
"created": "Wed, 1 Jun 2016 01:55:39 GMT",
"version": "v1"
}
] | 2016-07-22 | [
[
"Sharif",
"M.",
""
],
[
"Manzoor",
"Rubab",
""
]
] | This paper investigates dynamics of axial reflection symmetric model in self-interacting Brans-Dicke gravity for anisotropic fluid. We formulate hydrodynamical equations and discuss oscillations using time-dependent perturbation for both spin as well as spin-independent cases. The expressions of frequency, total energy... |
1901.04586 | Marc Casals | Marc Casals and Lu\'is F. Longo Micchi | Spectroscopy of Extremal (and Near-Extremal) Kerr Black Holes | 32 pages, 13 figures. In version 2, we included QNMs in extremal Kerr
for spin=-2, l=m=2 and 3 | Phys. Rev. D 99, 084047 (2019) | 10.1103/PhysRevD.99.084047 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate linear, spin-field perturbations of Kerr black holes in the
extremal limit throughout the complex-frequency domain. We calculate
quasi-normal modes of extremal Kerr, as well as of near-extremal Kerr, via a
novel approach: using the method of Mano, Suzuki and Takasugi (MST). We also
show how, in the ext... | [
{
"created": "Mon, 14 Jan 2019 22:16:36 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Feb 2019 03:36:41 GMT",
"version": "v2"
}
] | 2019-05-08 | [
[
"Casals",
"Marc",
""
],
[
"Micchi",
"Luís F. Longo",
""
]
] | We investigate linear, spin-field perturbations of Kerr black holes in the extremal limit throughout the complex-frequency domain. We calculate quasi-normal modes of extremal Kerr, as well as of near-extremal Kerr, via a novel approach: using the method of Mano, Suzuki and Takasugi (MST). We also show how, in the extre... |
0811.2468 | Peter Collas | Peter Collas and David Klein | Causality violating geodesics in Bonnor's rotating dust metric | null | Gen.Rel.Grav.36:2549,2004 | 10.1023/B:GERG.0000046853.99745.e4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We exhibit timelike geodesic paths for a metric, introduced by Bonnor [11]
and considered also by Steadman [13], and show that coordinate time runs
backward along a portion of these geodesics.
| [
{
"created": "Sat, 15 Nov 2008 09:34:15 GMT",
"version": "v1"
}
] | 2008-12-18 | [
[
"Collas",
"Peter",
""
],
[
"Klein",
"David",
""
]
] | We exhibit timelike geodesic paths for a metric, introduced by Bonnor [11] and considered also by Steadman [13], and show that coordinate time runs backward along a portion of these geodesics. |
2310.19148 | Sabir Ramazanov Dr. | Sabir Ramazanov | Spectrum of gravitational waves from long-lasting primordial sources | 15 pages; clarifications added; matches published version | JCAP02(2024)027 | null | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss long-lasting gravitational wave sources arising and operating
during radiation-dominated stage. Under a set of assumptions, we establish the
correspondence between cosmological evolution of a source and the resulting
gravitational wave spectrum. Namely, for the source energy density $\rho_s$
falling as a p... | [
{
"created": "Sun, 29 Oct 2023 20:48:22 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Nov 2023 18:42:21 GMT",
"version": "v2"
},
{
"created": "Thu, 22 Feb 2024 05:57:36 GMT",
"version": "v3"
}
] | 2024-02-23 | [
[
"Ramazanov",
"Sabir",
""
]
] | We discuss long-lasting gravitational wave sources arising and operating during radiation-dominated stage. Under a set of assumptions, we establish the correspondence between cosmological evolution of a source and the resulting gravitational wave spectrum. Namely, for the source energy density $\rho_s$ falling as a pow... |
1307.1757 | Alexander Nitz | Alexander H. Nitz, Andrew Lundgren, Duncan A. Brown, Evan Ochsner,
Drew Keppel, Ian W. Harry | Accuracy of gravitational waveform models for observing
neutron-star--black-hole binaries in Advanced LIGO | 17 pages, 15 figures, abstract shortened to the 1920 character limit | Phys. Rev. D 88, 124039 (2013) | 10.1103/PhysRevD.88.124039 | LIGO Document P1300063 | gr-qc astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waves radiated by the coalescence of compact-object binaries
containing a neutron star and a black hole are one of the most interesting
sources for the ground-based gravitational-wave observatories Advanced LIGO and
Advanced Virgo. Advanced LIGO will be sensitive to the inspiral of a $1.4\,
M_\odot$ neu... | [
{
"created": "Sat, 6 Jul 2013 06:50:21 GMT",
"version": "v1"
},
{
"created": "Tue, 20 May 2014 18:18:07 GMT",
"version": "v2"
}
] | 2014-05-21 | [
[
"Nitz",
"Alexander H.",
""
],
[
"Lundgren",
"Andrew",
""
],
[
"Brown",
"Duncan A.",
""
],
[
"Ochsner",
"Evan",
""
],
[
"Keppel",
"Drew",
""
],
[
"Harry",
"Ian W.",
""
]
] | Gravitational waves radiated by the coalescence of compact-object binaries containing a neutron star and a black hole are one of the most interesting sources for the ground-based gravitational-wave observatories Advanced LIGO and Advanced Virgo. Advanced LIGO will be sensitive to the inspiral of a $1.4\, M_\odot$ neutr... |
1802.07137 | David Vasak | D. Vasak, J. Kirsch, J. Struckmeier, H. Stoecker | On the cosmological constant in the deformed Einstein-Cartan gauge
gravity in De Donder-Weyl Hamiltonian formulation | This is superseded by the newest version of arXiv:2209.00501 which
was created accidentally during the first update attempt of arXiv:1802.07131
and kept up-to-date since | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A modification of the Einstein-Hilbert theory, the Covariant Canonical Gauge
Gravity (CCGG), leads to a cosmological constant that represents the energy of
the space-time continuum when deformed from its (A)dS ground state to a flat
geometry. CCGG is based on the canonical transformation theory in the De
Donder-Weyl ... | [
{
"created": "Tue, 20 Feb 2018 14:49:05 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Apr 2018 09:09:07 GMT",
"version": "v2"
},
{
"created": "Tue, 7 Aug 2018 11:03:57 GMT",
"version": "v3"
},
{
"created": "Thu, 24 Jun 2021 14:44:59 GMT",
"version": "v4"
},
{
"cr... | 2023-09-21 | [
[
"Vasak",
"D.",
""
],
[
"Kirsch",
"J.",
""
],
[
"Struckmeier",
"J.",
""
],
[
"Stoecker",
"H.",
""
]
] | A modification of the Einstein-Hilbert theory, the Covariant Canonical Gauge Gravity (CCGG), leads to a cosmological constant that represents the energy of the space-time continuum when deformed from its (A)dS ground state to a flat geometry. CCGG is based on the canonical transformation theory in the De Donder-Weyl (D... |
gr-qc/9505010 | Jean-Alain Marck | J.A. Marck | SHORTCUT METHOD OF SOLUTION OF GEODESIC EQUATIONS FOR SCHWARZSCHILD
BLACK HOLE | 11 pages, 2 PostScript figures (available as uuencoded compressed tar
file), uses epsfig.tex). Accepted on February 1995 for publication in
Classical and Quantum Gravity | Class.Quant.Grav. 13 (1996) 393-402 | 10.1088/0264-9381/13/3/007 | Preprint Observatoire de Paris | gr-qc | null | It is shown how the use of the Kerr-Schild coordinate system can greatly
simplify the formulation of the geodesic equation of the Schwarzschild
solution. An application of this formulation to the numerical computation of
the aspect of a non-rotating black hole is presented. The generalization to the
case of the Kerr ... | [
{
"created": "Wed, 10 May 1995 22:07:08 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Marck",
"J. A.",
""
]
] | It is shown how the use of the Kerr-Schild coordinate system can greatly simplify the formulation of the geodesic equation of the Schwarzschild solution. An application of this formulation to the numerical computation of the aspect of a non-rotating black hole is presented. The generalization to the case of the Kerr so... |
2301.07449 | Chen Wu | Mao-Yuan Wan and Chen Wu | Absorption and scattering of a high dimensional noncommutative black
hole | 10 pages and 4 figures | Eur. Phys. J. C (2023) 83:28 | 10.1140/epjc/s10052-022-11167-2 | null | gr-qc | http://creativecommons.org/licenses/by-sa/4.0/ | In this work, we investigate the scattering of massless plane scalar waves by
the high dimensional noncommutative Schwarzschild-Tangherlini black hole. We
use the partial wave approach to determine the scattering and absorption cross
sections in the incident wavelength range. Our numerical results demonstrate
that th... | [
{
"created": "Wed, 18 Jan 2023 11:45:04 GMT",
"version": "v1"
}
] | 2023-01-23 | [
[
"Wan",
"Mao-Yuan",
""
],
[
"Wu",
"Chen",
""
]
] | In this work, we investigate the scattering of massless plane scalar waves by the high dimensional noncommutative Schwarzschild-Tangherlini black hole. We use the partial wave approach to determine the scattering and absorption cross sections in the incident wavelength range. Our numerical results demonstrate that the ... |
2212.03098 | David Benisty | David Benisty, Philippe Brax, Anne-Christine Davis | Stringent Pulsar Timing Bounds on Light Scalar Couplings to Matter | 17 pages, 9 figures, Accepted in Phys. Rev. D | null | 10.1103/PhysRevD.107.064049 | null | gr-qc astro-ph.HE astro-ph.SR hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Pulsar Timing constraints on scalar-tensor theories with conformal and
disformal couplings to matter are discussed. Reducing the dynamics to the
motion in the centre of mass frame and using the mean anomaly parametrisation,
we find the first post-Newtonian corrections induced by the conformal and
disformal interactio... | [
{
"created": "Tue, 6 Dec 2022 16:06:55 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Mar 2023 13:49:53 GMT",
"version": "v2"
}
] | 2023-03-24 | [
[
"Benisty",
"David",
""
],
[
"Brax",
"Philippe",
""
],
[
"Davis",
"Anne-Christine",
""
]
] | Pulsar Timing constraints on scalar-tensor theories with conformal and disformal couplings to matter are discussed. Reducing the dynamics to the motion in the centre of mass frame and using the mean anomaly parametrisation, we find the first post-Newtonian corrections induced by the conformal and disformal interactions... |
1905.07105 | Siamak Akhshabi | S. Gharibi Nodijeh, S. Akhshabi, and F. Khajenabi | Orbits of particles and black hole thermodynamics in a spacetime with
torsion | 10 paes, 8 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the static spherically symmetric vacuum solution for a spacetime
with non-vanishing torsion by solving the field equations analytically. The
effects of torsion appear as a single parameter in the line element. For the
positive values of this parameter, the resulting line element is found to be of
the Reissn... | [
{
"created": "Fri, 17 May 2019 03:50:04 GMT",
"version": "v1"
}
] | 2019-05-20 | [
[
"Nodijeh",
"S. Gharibi",
""
],
[
"Akhshabi",
"S.",
""
],
[
"Khajenabi",
"F.",
""
]
] | We derive the static spherically symmetric vacuum solution for a spacetime with non-vanishing torsion by solving the field equations analytically. The effects of torsion appear as a single parameter in the line element. For the positive values of this parameter, the resulting line element is found to be of the Reissner... |
gr-qc/9309022 | Jasjeet Bagla | J.S.Bagla and T.Padmanabhan | Nonlinear Evolution of Density Perturbations | (Paper presented at the 6th Asia Pacific regional meeting of the IAU)
, 7 pages, 8 figures ( 4 figures not included, available on request),
uuencoded postscript file | J.Astrophys.Astron. 16 (1995) 77 | null | null | gr-qc astro-ph | null | : From the epoch of recombination $(z\approx 10^3)$ till today, the typical
density contrasts have grown by a factor of about $10^6$ in a Friedmann
universe with $\Omega=1$. However, during the same epoch the typical
gravitational potential has grown only by a factor of order unity. We present
theoretical arguments e... | [
{
"created": "Thu, 23 Sep 1993 19:31:32 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Bagla",
"J. S.",
""
],
[
"Padmanabhan",
"T.",
""
]
] | : From the epoch of recombination $(z\approx 10^3)$ till today, the typical density contrasts have grown by a factor of about $10^6$ in a Friedmann universe with $\Omega=1$. However, during the same epoch the typical gravitational potential has grown only by a factor of order unity. We present theoretical arguments exp... |
1112.4613 | Alfio Bonanno | Alfio Bonanno and Sante Carloni | Dynamical System Analysis of Cosmologies with Running Cosmological
Constant from Quantum Einstein Gravity | 26 pages, 4 figures. To appear in New Journal of Physics | null | 10.1088/1367-2630/14/2/025008 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a mechanism that induces a time-dependent vacuum energy on
cosmological scales. It is based on the instability induced renormalization
triggered by the low energy quantum fluctuations in a Universe with a positive
cosmological constant. We employ the dynamical systems approach to study the
qualitative beha... | [
{
"created": "Tue, 20 Dec 2011 09:17:45 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Bonanno",
"Alfio",
""
],
[
"Carloni",
"Sante",
""
]
] | We discuss a mechanism that induces a time-dependent vacuum energy on cosmological scales. It is based on the instability induced renormalization triggered by the low energy quantum fluctuations in a Universe with a positive cosmological constant. We employ the dynamical systems approach to study the qualitative behavi... |
1702.04724 | Liang Dai | Liang Dai, Tejaswi Venumadhav | On the waveforms of gravitationally lensed gravitational waves | 5 pages, 4 figures, comments welcome | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Strong lensing by intervening galaxies can produce multiple images of
gravitational waves from sources at cosmological distances. These images
acquire additional phase-shifts as the over-focused wavefront passes through
itself along the line of sight. Time domain waveforms of Type-II images
(associated with saddle po... | [
{
"created": "Wed, 15 Feb 2017 19:00:01 GMT",
"version": "v1"
}
] | 2017-02-17 | [
[
"Dai",
"Liang",
""
],
[
"Venumadhav",
"Tejaswi",
""
]
] | Strong lensing by intervening galaxies can produce multiple images of gravitational waves from sources at cosmological distances. These images acquire additional phase-shifts as the over-focused wavefront passes through itself along the line of sight. Time domain waveforms of Type-II images (associated with saddle poin... |
2010.07549 | Neda Ebrahimi | Fatemeh Koohestani, Neda Ebrahimi, Mehdi Vatandoost, Yousef Bahrampour | The cosmological time functions and lightlike rays | 12 pages | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is proved that all discontinuity points of a finite cosmological time
function, $\tau$, are on past lightlike rays. As a result, it is proved that if
$(M,g)$ is a chronological space-time without past lightlike rays then there is
a representation of $g$ such that its cosmological time function is regular. In
addit... | [
{
"created": "Thu, 15 Oct 2020 06:54:54 GMT",
"version": "v1"
}
] | 2020-10-16 | [
[
"Koohestani",
"Fatemeh",
""
],
[
"Ebrahimi",
"Neda",
""
],
[
"Vatandoost",
"Mehdi",
""
],
[
"Bahrampour",
"Yousef",
""
]
] | It is proved that all discontinuity points of a finite cosmological time function, $\tau$, are on past lightlike rays. As a result, it is proved that if $(M,g)$ is a chronological space-time without past lightlike rays then there is a representation of $g$ such that its cosmological time function is regular. In additio... |
1807.09745 | Andrew DeBenedictis | Andrew DeBenedictis, Sasa Ilijic | Energy condition respecting warp drives: The role of spin in
Einstein-Cartan theory | 18 pages, 6 figures. v3: minor clarifications included to match
version accepted for publication in Classical and Quantum Gravity | Class. Quantum Grav. 35 215001 (2018) | 10.1088/1361-6382/aae326 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the so called "warp drive" spacetimes within the
$U_{4}$ Riemann-Cartan manifolds of Einstein-Cartan theory. Specifically, the
role that spin may play with respect to energy condition violation is
considered. It turns out that with the addition of spin, the torsion terms in
Einstein-Cartan grav... | [
{
"created": "Wed, 25 Jul 2018 17:49:28 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Jul 2018 01:13:59 GMT",
"version": "v2"
},
{
"created": "Thu, 20 Sep 2018 20:08:00 GMT",
"version": "v3"
}
] | 2018-10-09 | [
[
"DeBenedictis",
"Andrew",
""
],
[
"Ilijic",
"Sasa",
""
]
] | In this paper we study the so called "warp drive" spacetimes within the $U_{4}$ Riemann-Cartan manifolds of Einstein-Cartan theory. Specifically, the role that spin may play with respect to energy condition violation is considered. It turns out that with the addition of spin, the torsion terms in Einstein-Cartan gravit... |
gr-qc/0212006 | Israel Quiros Rodriguez | Olga Arias, Israel Quiros (Physics Department, Las Villas Central
University, Santa Clara) | New exact cosmological solutions to Brans-Dicke gravity with a
self-interacting scalar-field | 10 pages, latex, 3 ps figures | null | null | null | gr-qc | null | We derive a new parametric class of exact cosmological solutions to
Brans-Dicke theory of gravity with a self-interacting scalar field and a
barotropic perfect fluid of ordinary matter, by assuming a linear relationship
between the Hubble expansion parameter and the time derivative of the scalar
field. As a consequen... | [
{
"created": "Sun, 1 Dec 2002 19:17:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Arias",
"Olga",
"",
"Physics Department, Las Villas Central\n University, Santa Clara"
],
[
"Quiros",
"Israel",
"",
"Physics Department, Las Villas Central\n University, Santa Clara"
]
] | We derive a new parametric class of exact cosmological solutions to Brans-Dicke theory of gravity with a self-interacting scalar field and a barotropic perfect fluid of ordinary matter, by assuming a linear relationship between the Hubble expansion parameter and the time derivative of the scalar field. As a consequence... |
1509.06963 | Mariam Bouhmadi-Lopez | Mariam Bouhmadi-L\'opez, Maxim Brilenkov, Ruslan Brilenkov, Jo\~ao
Morais, Alexander Zhuk | Scalar perturbations in the late Universe: viability of the Chaplygin
gas models | 18 pages, no figures. Discussion improved. Version accepted in JCAP | JCAP 12 (2015) 037 | 10.1088/1475-7516/2015/12/037 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the late-time evolution of the Universe where dark energy (DE) is
parametrized by a modified generalized Chaplygin gas (mGCG) on top of cold dark
matter (CDM). We also take into account the radiation content of the Universe.
In this context, the late stage of the evolution of the universe refers to the
epoch... | [
{
"created": "Sat, 12 Sep 2015 10:59:07 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Dec 2015 15:07:11 GMT",
"version": "v2"
}
] | 2015-12-22 | [
[
"Bouhmadi-López",
"Mariam",
""
],
[
"Brilenkov",
"Maxim",
""
],
[
"Brilenkov",
"Ruslan",
""
],
[
"Morais",
"João",
""
],
[
"Zhuk",
"Alexander",
""
]
] | We study the late-time evolution of the Universe where dark energy (DE) is parametrized by a modified generalized Chaplygin gas (mGCG) on top of cold dark matter (CDM). We also take into account the radiation content of the Universe. In this context, the late stage of the evolution of the universe refers to the epoch w... |
2105.00491 | Yu-Xiao Liu | Si-Jiang Yang, Run Zhou, Shao-Wen Wei, Yu-Xiao Liu | Kinetics of a phase transition for a Kerr-AdS black hole on the
free-energy landscape | 16 pages, 10 figures, published version | Phys.Rev.D 105 (2022) 8, 084030 | 10.1103/PhysRevD.105.084030 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By treating the order parameter as a stochastic thermal fluctuating variable
for small-large black hole phase transition, we investigate the kinetic process
of phase transition for the Kerr-AdS (anti-de Sitter) black holes on free
energy landscape. We find that the extremal points of the off shell Gibbs free
energy c... | [
{
"created": "Sun, 2 May 2021 14:57:42 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Apr 2022 12:21:02 GMT",
"version": "v2"
}
] | 2022-04-21 | [
[
"Yang",
"Si-Jiang",
""
],
[
"Zhou",
"Run",
""
],
[
"Wei",
"Shao-Wen",
""
],
[
"Liu",
"Yu-Xiao",
""
]
] | By treating the order parameter as a stochastic thermal fluctuating variable for small-large black hole phase transition, we investigate the kinetic process of phase transition for the Kerr-AdS (anti-de Sitter) black holes on free energy landscape. We find that the extremal points of the off shell Gibbs free energy cor... |
gr-qc/9611011 | Martin Rainer | A. Zhuk | On Relation between String Theory and Multidimensional Cosmology | latex, to appear in Gravitation and Cosmology | Grav.Cosmol. 2 (1996) 319-320 | null | OU-DTP/96-01 | gr-qc | null | It is shown that a transition from a multidimensional cosmological model with
one internal space of the dimension d_1 to the effective tree-level bosonic
string corresponds to an infinite number of the internal dimensions: d_1 ->
infinity.
| [
{
"created": "Tue, 5 Nov 1996 16:17:37 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Zhuk",
"A.",
""
]
] | It is shown that a transition from a multidimensional cosmological model with one internal space of the dimension d_1 to the effective tree-level bosonic string corresponds to an infinite number of the internal dimensions: d_1 -> infinity. |
gr-qc/9907032 | Sang Pyo Kim | Dongsu Bak, Sang Pyo Kim, Sung Ku Kim, Kwang-Sup Soh, and Jae Hyung
Yee | Wave Functions for Quantum Black Hole Formation in Scalar Field Collapse | RevTex, 14 pages, no figures; Eq. (36) and references added; revised
version for PRD | Phys.Rev. D61 (2000) 044005 | 10.1103/PhysRevD.61.044005 | null | gr-qc | null | We study quantum mechanically the self-similar black hole formation by
collapsing scalar field and find the wave functions that give the correct
semiclassical limit. In contrast to classical theory, the wave functions for
the black hole formation even in the supercritical case have not only incoming
flux but also out... | [
{
"created": "Thu, 8 Jul 1999 03:17:44 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Jul 1999 06:28:10 GMT",
"version": "v2"
},
{
"created": "Tue, 5 Oct 1999 07:40:53 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Bak",
"Dongsu",
""
],
[
"Kim",
"Sang Pyo",
""
],
[
"Kim",
"Sung Ku",
""
],
[
"Soh",
"Kwang-Sup",
""
],
[
"Yee",
"Jae Hyung",
""
]
] | We study quantum mechanically the self-similar black hole formation by collapsing scalar field and find the wave functions that give the correct semiclassical limit. In contrast to classical theory, the wave functions for the black hole formation even in the supercritical case have not only incoming flux but also outgo... |
gr-qc/0505146 | Alberto Saa | Ricardo A. Mosna and Alberto Saa | Volume elements and torsion | Revtex, 8 pages, 1 figure. v2 includes a discussion on
$\lambda$-symmetry | J.Math.Phys. 46 (2005) 112502 | 10.1063/1.2121207 | null | gr-qc math-ph math.MP | null | We reexamine here the issue of consistency of minimal action formulation with
the minimal coupling procedure (MCP) in spaces with torsion. In Riemann-Cartan
spaces, it is known that a proper use of the MCP requires that the trace of the
torsion tensor be a gradient, $T_\mu=\partial_\mu\theta$, and that the modified
v... | [
{
"created": "Sun, 29 May 2005 19:44:51 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jul 2005 14:04:07 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Mosna",
"Ricardo A.",
""
],
[
"Saa",
"Alberto",
""
]
] | We reexamine here the issue of consistency of minimal action formulation with the minimal coupling procedure (MCP) in spaces with torsion. In Riemann-Cartan spaces, it is known that a proper use of the MCP requires that the trace of the torsion tensor be a gradient, $T_\mu=\partial_\mu\theta$, and that the modified vol... |
gr-qc/0409121 | Michael B. Mensky | Michael B. Mensky (P.N.Lebedev Physical Institute, Moscow) | Energy conservation and equivalence principle in General Relativity | 9 pages, Latex, one figure | Phys.Lett. A328 (2004) 261-269 | 10.1016/j.physleta.2004.06.040 | null | gr-qc | null | The generalized Stokes theorem (connecting integrals of dimensions 3 and 4)
is formulated in a curved space-time in terms of paths in Minkowski space
(forming Path Group). A covariant integral form of the conservation law for the
energy-momentum of matter is then derived in General Relativity. It extends
Einstein's e... | [
{
"created": "Thu, 30 Sep 2004 13:32:34 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Mensky",
"Michael B.",
"",
"P.N.Lebedev Physical Institute, Moscow"
]
] | The generalized Stokes theorem (connecting integrals of dimensions 3 and 4) is formulated in a curved space-time in terms of paths in Minkowski space (forming Path Group). A covariant integral form of the conservation law for the energy-momentum of matter is then derived in General Relativity. It extends Einstein's equ... |
2401.17495 | Sudhagar Suyamprakasam | Bernard Hall, Sudhagar Suyamprakasam, Nairwita Mazumder, Anupreeta
More, Sukanta Bose | Identifying noise transients in gravitational-wave data arising from
nonlinear couplings | 25 Pages, 10 figures. Reviewed by LIGO Scientific Collaboration (LSC)
with LIGO Document Number P2200344 | null | null | null | gr-qc astro-ph.IM physics.data-an | http://creativecommons.org/licenses/by/4.0/ | Noise in various interferometer systems can sometimes couple non-linearly to
create excess noise in the gravitational wave (GW) strain data. Third-order
statistics, such as bicoherence and biphase, can identify these couplings and
help discriminate those occurrences from astrophysical GW signals. However, the
convent... | [
{
"created": "Tue, 30 Jan 2024 23:00:40 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Jul 2024 18:16:04 GMT",
"version": "v2"
}
] | 2024-07-29 | [
[
"Hall",
"Bernard",
""
],
[
"Suyamprakasam",
"Sudhagar",
""
],
[
"Mazumder",
"Nairwita",
""
],
[
"More",
"Anupreeta",
""
],
[
"Bose",
"Sukanta",
""
]
] | Noise in various interferometer systems can sometimes couple non-linearly to create excess noise in the gravitational wave (GW) strain data. Third-order statistics, such as bicoherence and biphase, can identify these couplings and help discriminate those occurrences from astrophysical GW signals. However, the conventio... |
2008.05899 | Oem Trivedi | Oem Trivedi | The exact solution approach to warm inflation | v2, matches the published version in Astroparticle Physics, 10 pages
with no figures | Astropart.Phys. 158 (2024) 102951 | 10.1016/j.astropartphys.2024.102951 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The theory of cosmic inflation has received a great amount of deserved
attention in recent years due to it's stunning predictions about the early
universe. Alongside the usual cold inflation paradigm, warm inflation has
garnered a huge amount of interest in modern inflationary studies. It's
peculiar features and spec... | [
{
"created": "Wed, 12 Aug 2020 16:57:09 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Aug 2024 14:08:27 GMT",
"version": "v2"
}
] | 2024-08-02 | [
[
"Trivedi",
"Oem",
""
]
] | The theory of cosmic inflation has received a great amount of deserved attention in recent years due to it's stunning predictions about the early universe. Alongside the usual cold inflation paradigm, warm inflation has garnered a huge amount of interest in modern inflationary studies. It's peculiar features and specif... |
2108.00957 | Lucrezia Ravera | N. Myrzakulov, R. Myrzakulov, L. Ravera | Metric-Affine Myrzakulov Gravity Theories | 45 pages | Symmetry 13 (2021) no.10, 1855 | 10.3390/sym13101855 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we review the Myrzakulov Gravity models (MG-N, with $\mathrm{N
= I, II, \ldots, VIII}$) and derive their respective metric-affine
generalizations (MAMG-N), discussing also their particular sub-cases. The field
equations of the theories are obtained by regarding the metric tensor and the
general affine c... | [
{
"created": "Fri, 30 Jul 2021 07:32:50 GMT",
"version": "v1"
}
] | 2021-11-03 | [
[
"Myrzakulov",
"N.",
""
],
[
"Myrzakulov",
"R.",
""
],
[
"Ravera",
"L.",
""
]
] | In this paper we review the Myrzakulov Gravity models (MG-N, with $\mathrm{N = I, II, \ldots, VIII}$) and derive their respective metric-affine generalizations (MAMG-N), discussing also their particular sub-cases. The field equations of the theories are obtained by regarding the metric tensor and the general affine con... |
2203.02282 | Christian Corda Prof. | Christian Corda | On the equivalence between rotation and gravity: "Gravitational" and
"cosmological" redshifts in the laboratory | 18 pages, 1 figure, final version matching the one published in
Foundations of Physics. Comments are welcome | Found Phys 52, 42 (2022) | 10.1007/s10701-022-00558-w | null | gr-qc astro-ph.CO hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The M\"ossbauer rotor effect recently gained a renewed interest due to the
discovery and explanation of an additional effect of clock synchronization
which has been missed for about 50 years, i.e. starting from a famous book of
Pauli, till some recent experimental analyses. The theoretical explanation of
such an addi... | [
{
"created": "Wed, 2 Mar 2022 15:06:52 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Mar 2022 16:38:36 GMT",
"version": "v2"
}
] | 2022-03-30 | [
[
"Corda",
"Christian",
""
]
] | The M\"ossbauer rotor effect recently gained a renewed interest due to the discovery and explanation of an additional effect of clock synchronization which has been missed for about 50 years, i.e. starting from a famous book of Pauli, till some recent experimental analyses. The theoretical explanation of such an additi... |
0704.3550 | Alessandro Nagar | Thibault Damour, Alessandro Nagar | Final spin of a coalescing black-hole binary: an Effective-One-Body
approach | 8 pages, two figures. To appear in Phys. Rev. D | Phys.Rev.D76:044003,2007 | 10.1103/PhysRevD.76.044003 | null | gr-qc | null | We update the analytical estimate of the final spin of a coalescing
black-hole binary derived within the Effective-One-Body (EOB) approach. We
consider unequal-mass non-spinning black-hole binaries. It is found that a more
complete account of relevant physical effects (higher post-Newtonian accuracy,
ringdown losses)... | [
{
"created": "Thu, 26 Apr 2007 14:22:01 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jul 2007 15:30:22 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Damour",
"Thibault",
""
],
[
"Nagar",
"Alessandro",
""
]
] | We update the analytical estimate of the final spin of a coalescing black-hole binary derived within the Effective-One-Body (EOB) approach. We consider unequal-mass non-spinning black-hole binaries. It is found that a more complete account of relevant physical effects (higher post-Newtonian accuracy, ringdown losses) a... |
gr-qc/9901003 | Aharon Davidson | Aharon Davidson, David Karasik, and Yoav Lederer | Wave Function of a Brane-like Universe | Revtex, 4 twocolumn pages, 3 eps figures (accepted for publication in
Class. Quan. Grav.) | Class.Quant.Grav. 16 (1999) 1349-1356 | 10.1088/0264-9381/16/4/023 | null | gr-qc hep-th | null | Within the mini-superspace model, brane-like cosmology means performing the
variation with respect to the embedding (Minkowski) time $\tau$ before fixing
the cosmic (Einstein) time $t$. The departure from Einstein limit is
parameterized by the 'energy' conjugate to $\tau$, and characterized by a
classically disconnec... | [
{
"created": "Sat, 2 Jan 1999 10:57:26 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Davidson",
"Aharon",
""
],
[
"Karasik",
"David",
""
],
[
"Lederer",
"Yoav",
""
]
] | Within the mini-superspace model, brane-like cosmology means performing the variation with respect to the embedding (Minkowski) time $\tau$ before fixing the cosmic (Einstein) time $t$. The departure from Einstein limit is parameterized by the 'energy' conjugate to $\tau$, and characterized by a classically disconnecte... |
1805.03314 | Gregory Ashton | Gregory Ashton, and Reinhard Prix, and Ian Jones | A semicoherent glitch-robust continuous gravitational wave search | 9 pages, 6 figures, 2 tables | Phys. Rev. D 98, 063011 (2018) | 10.1103/PhysRevD.98.063011 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Continuous gravitational-wave signals from isolated non-axisymmetric rotating
neutron stars may undergo episodic spin-up events known as glitches. If
unmodelled by a search, these can result in missed or misidentified detections.
We outline a semicoherent glitch-robust search method that allows
identification of glit... | [
{
"created": "Tue, 8 May 2018 22:59:26 GMT",
"version": "v1"
}
] | 2018-09-26 | [
[
"Ashton",
"Gregory",
""
],
[
"Prix",
"Reinhard",
""
],
[
"Jones",
"Ian",
""
]
] | Continuous gravitational-wave signals from isolated non-axisymmetric rotating neutron stars may undergo episodic spin-up events known as glitches. If unmodelled by a search, these can result in missed or misidentified detections. We outline a semicoherent glitch-robust search method that allows identification of glitch... |
1501.01482 | Sunandan Gangopadhyay | Sunandan Gangopadhyay, Abhijit Dutta, Mir Faizal | Constraints on the Generalized Uncertainty Principle from Black Hole
Thermodynamics | To appear in Euro.Phys.Lett | Euro.Phys.Lett.112 (2015) 20006 | 10.1209/0295-5075/112/20006 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we calculate the modification to the thermodynamics of a
Schwarzschild black hole in higher dimensions because of Generalized
Uncertainty Principle (GUP). We use the fact that the leading order corrections
to the entropy of a black hole has to be logarithmic in nature to restrict the
form of GUP. We ob... | [
{
"created": "Wed, 7 Jan 2015 13:16:45 GMT",
"version": "v1"
},
{
"created": "Sat, 31 Oct 2015 05:15:59 GMT",
"version": "v2"
}
] | 2015-12-09 | [
[
"Gangopadhyay",
"Sunandan",
""
],
[
"Dutta",
"Abhijit",
""
],
[
"Faizal",
"Mir",
""
]
] | In this paper, we calculate the modification to the thermodynamics of a Schwarzschild black hole in higher dimensions because of Generalized Uncertainty Principle (GUP). We use the fact that the leading order corrections to the entropy of a black hole has to be logarithmic in nature to restrict the form of GUP. We obse... |
1004.0339 | Harald Lueck | Harald L\"uck, Christopf Affeldt, Jerome Degallaix, Andreas Freise,
Hartmut Grote, Martin Hewitson, Stefan Hild, Jonathan Leong, Mirko Prijatelj,
Kenneth A. Strain, Benno Willke, Holger Wittel, Karsten Danzmann | The upgrade of GEO600 | 9 pages, Amaldi 8 conference contribution | J.Phys.Conf.Ser.228:012012,2010 | 10.1088/1742-6596/228/1/012012 | Amaldi2009GEO | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The German / British gravitational wave detector GEO 600 is in the process of
being upgraded. The upgrading process of GEO 600, called GEO-HF, will
concentrate on the improvement of the sensitivity for high frequency signals
and the demonstration of advanced technologies. In the years 2009 to 2011 the
detector will u... | [
{
"created": "Fri, 2 Apr 2010 14:14:42 GMT",
"version": "v1"
}
] | 2015-03-13 | [
[
"Lück",
"Harald",
""
],
[
"Affeldt",
"Christopf",
""
],
[
"Degallaix",
"Jerome",
""
],
[
"Freise",
"Andreas",
""
],
[
"Grote",
"Hartmut",
""
],
[
"Hewitson",
"Martin",
""
],
[
"Hild",
"Stefan",
""
],
[
... | The German / British gravitational wave detector GEO 600 is in the process of being upgraded. The upgrading process of GEO 600, called GEO-HF, will concentrate on the improvement of the sensitivity for high frequency signals and the demonstration of advanced technologies. In the years 2009 to 2011 the detector will und... |
1211.2848 | Carlos Molina Mendes | J. C. S. Neves and C. Molina | Rotating black holes in a Randall-Sundrum brane with a cosmological
constant | 10 pages, 3 figures. Version published on Physical Review D | Phys.Rev.D86, 124047 (2012) | 10.1103/PhysRevD.86.124047 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we have constructed axially symmetric vacuum solutions of the
gravitational field equations in a Randall-Sundrum brane. A non-null effective
cosmological constant is considered, and asymptotically de Sitter and anti-de
Sitter spacetimes are obtained. The solutions describe rotating black holes in
a four-... | [
{
"created": "Mon, 12 Nov 2012 22:32:06 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Jan 2013 17:19:57 GMT",
"version": "v2"
}
] | 2013-01-14 | [
[
"Neves",
"J. C. S.",
""
],
[
"Molina",
"C.",
""
]
] | In this work we have constructed axially symmetric vacuum solutions of the gravitational field equations in a Randall-Sundrum brane. A non-null effective cosmological constant is considered, and asymptotically de Sitter and anti-de Sitter spacetimes are obtained. The solutions describe rotating black holes in a four-di... |
1909.12664 | Antonina Zinhailo | A. F. Zinhailo | Quasinormal modes of Dirac field in the Einstein-dilaton-Gauss-Bonnet
and Einstein-Weyl gravities | 10 pages, 5 figures | null | 10.1140/epjc/s10052-019-7425-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quasinormal modes of Dirac field in the background of a non-Schwarzschild
black holes in theories with higher curvature corrections are investigated in
this paper. With the help of the semi-analytic WKB approximation and further
using of Pad\'e approximants as prescribed in [1] we consider quasinormal modes
of a test... | [
{
"created": "Fri, 27 Sep 2019 13:03:36 GMT",
"version": "v1"
}
] | 2020-01-08 | [
[
"Zinhailo",
"A. F.",
""
]
] | Quasinormal modes of Dirac field in the background of a non-Schwarzschild black holes in theories with higher curvature corrections are investigated in this paper. With the help of the semi-analytic WKB approximation and further using of Pad\'e approximants as prescribed in [1] we consider quasinormal modes of a test m... |
1803.04268 | Rashmi Uniyal | Rashmi Uniyal, Hemwati Nandan and Philippe Jetzer | Bending angle of light in equatorial plane of Kerr-Sen Black Hole | arXiv admin note: text overlap with arXiv:0907.5352 by other authors | Phys.Lett. B782 (2018) 185-192 | 10.1016/j.physletb.2018.05.006 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the gravitational lensing by a Kerr-Sen Black Hole arising in
heterotic string theory. A closed form expression for the bending angle of
light in equatorial plane of Kerr-Sen Black Hole is derived as a function of
impact parameter, spin and charge of the Black Hole. Results obtained are also
compared with th... | [
{
"created": "Fri, 9 Mar 2018 12:57:35 GMT",
"version": "v1"
},
{
"created": "Wed, 23 May 2018 05:16:39 GMT",
"version": "v2"
}
] | 2018-05-24 | [
[
"Uniyal",
"Rashmi",
""
],
[
"Nandan",
"Hemwati",
""
],
[
"Jetzer",
"Philippe",
""
]
] | We study the gravitational lensing by a Kerr-Sen Black Hole arising in heterotic string theory. A closed form expression for the bending angle of light in equatorial plane of Kerr-Sen Black Hole is derived as a function of impact parameter, spin and charge of the Black Hole. Results obtained are also compared with the ... |
1704.08640 | Konstantinos Ntrekis | George Koutsoumbas, Konstantinos Ntrekis, Eleftherios Papantonopoulos,
Emmanuel N. Saridakis | Unification of Dark Matter - Dark Energy in Generalized Galileon
Theories | 15 pages, 6 figures, version published in JCAP | JCAP 1802 (2018) no.02, 003 | 10.1088/1475-7516/2018/02/003 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a unified description of the dark matter and the dark energy
sectors, in the framework of shift-symmetric generalized Galileon theories.
Considering a particular combination of terms in the Horndeski Lagrangian in
which we have not introduced a cosmological constant or a matter sector, we
obtain an effecti... | [
{
"created": "Thu, 27 Apr 2017 16:17:45 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jan 2018 12:36:09 GMT",
"version": "v2"
}
] | 2018-02-07 | [
[
"Koutsoumbas",
"George",
""
],
[
"Ntrekis",
"Konstantinos",
""
],
[
"Papantonopoulos",
"Eleftherios",
""
],
[
"Saridakis",
"Emmanuel N.",
""
]
] | We present a unified description of the dark matter and the dark energy sectors, in the framework of shift-symmetric generalized Galileon theories. Considering a particular combination of terms in the Horndeski Lagrangian in which we have not introduced a cosmological constant or a matter sector, we obtain an effective... |
gr-qc/0410114 | Deborah A. Konkowski | D.A. Konkowski, C. Reese, T.M. Helliwell, C. Wieland | Classical and Quantum Singularities of Levi-Civita Spacetimes with and
without a Positive Cosmological Constant | 14 pages, no figures, submitted to Proceedings of the Workshop on
Dynamics and Thermodynamics of Blackholes and Naked Singularities (Milan, May
2004) | null | null | null | gr-qc | null | Levi-Civita spacetimes have classical naked singularities. They also have
quantum singularities. Quantum singularities in general relativistic spacetimes
are determined by the behavior of quantum test particles. A static spacetime is
said to be quantum mechanically singular if the spatial portion of the wave
operator... | [
{
"created": "Thu, 21 Oct 2004 20:52:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Konkowski",
"D. A.",
""
],
[
"Reese",
"C.",
""
],
[
"Helliwell",
"T. M.",
""
],
[
"Wieland",
"C.",
""
]
] | Levi-Civita spacetimes have classical naked singularities. They also have quantum singularities. Quantum singularities in general relativistic spacetimes are determined by the behavior of quantum test particles. A static spacetime is said to be quantum mechanically singular if the spatial portion of the wave operator i... |
2401.11482 | Liping Meng | Liping Meng, Zhaoyi Xu, Meirong Tang | Destroying the Event Horizon of Cold Dark Matter-Black Hole System | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Since the Weak Cosmic Censorship Conjecture was proposed, research on this
conjecture has been ongoing. This paper explores the conjecture in black holes
that are closer to those existing in the real universe (i.e., rotating black
holes enveloped by dark matter). In this paper, we obtained a first-order
corrected ana... | [
{
"created": "Sun, 21 Jan 2024 13:08:29 GMT",
"version": "v1"
},
{
"created": "Mon, 6 May 2024 09:23:39 GMT",
"version": "v2"
},
{
"created": "Tue, 25 Jun 2024 14:34:09 GMT",
"version": "v3"
},
{
"created": "Mon, 29 Jul 2024 08:58:28 GMT",
"version": "v4"
}
] | 2024-07-30 | [
[
"Meng",
"Liping",
""
],
[
"Xu",
"Zhaoyi",
""
],
[
"Tang",
"Meirong",
""
]
] | Since the Weak Cosmic Censorship Conjecture was proposed, research on this conjecture has been ongoing. This paper explores the conjecture in black holes that are closer to those existing in the real universe (i.e., rotating black holes enveloped by dark matter). In this paper, we obtained a first-order corrected analy... |
1112.0880 | Claes Uggla | Claes Uggla and John Wainwright | Scalar Cosmological Perturbations | null | null | 10.1088/0264-9381/29/10/105002 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scalar perturbations of Friedmann-Lemaitre cosmologies can be analyzed in a
variety of ways using Einstein's field equations, the Ricci and Bianchi
identities, or the conservation equations for the stress-energy tensor, and
possibly introducing a timelike reference congruence. The common ground is the
use of gauge in... | [
{
"created": "Mon, 5 Dec 2011 10:34:13 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Uggla",
"Claes",
""
],
[
"Wainwright",
"John",
""
]
] | Scalar perturbations of Friedmann-Lemaitre cosmologies can be analyzed in a variety of ways using Einstein's field equations, the Ricci and Bianchi identities, or the conservation equations for the stress-energy tensor, and possibly introducing a timelike reference congruence. The common ground is the use of gauge inva... |
2102.10650 | Kouji Nakamura | Kouji Nakamura | Formal solutions of any-order mass, angular-momentum, dipole
perturbations on the Schwarzschild background spacetime | 10 pages, no figure. arXiv admin note: text overlap with
arXiv:2102.00830 (v1), arXiv:1403.1004; 11 pages no figure. The whole
presentations are changed and references are re-organized and added, although
the main assertion of this paper is unchanged. (v2); introduction is changed,
references are added. (v3) | Letters in High Energy Physics vol.2021 (2021), 215 | 10.31526/lhep.2021.215 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Formal solutions of any-order mass, angular-momentum, dipole perturbations on
the Schwarzschild background spacetime are derived in a gauge-invariant manner.
Once we accept the proposal in [K. Nakamura, Class. Quantum Grav. {\bf 38}
(2021), 145010.], we can extend the gauge-invariant linear perturbation theory
on the... | [
{
"created": "Sun, 21 Feb 2021 17:22:26 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Jun 2021 09:29:50 GMT",
"version": "v2"
},
{
"created": "Tue, 29 Jun 2021 08:14:51 GMT",
"version": "v3"
}
] | 2021-11-02 | [
[
"Nakamura",
"Kouji",
""
]
] | Formal solutions of any-order mass, angular-momentum, dipole perturbations on the Schwarzschild background spacetime are derived in a gauge-invariant manner. Once we accept the proposal in [K. Nakamura, Class. Quantum Grav. {\bf 38} (2021), 145010.], we can extend the gauge-invariant linear perturbation theory on the S... |
1809.07345 | Zhan-Feng Mai | Jia-Hui Huang, Mu-Zi Zhang, Tian-Tian Cao, Yi-Feng Zou and Zhan-Feng
Mai | Superradiant instability of dyonic black holes in string theory | 14 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When a scalar wave perturbation is properly scattering off a charged or
rotating black hole, the energy of the reflected scalar wave may be amplified.
This is a superradiant process. If this amplification process can occur back
and forth through certain confining mechanism, it will lead to strong
instability of the b... | [
{
"created": "Wed, 19 Sep 2018 18:00:15 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Oct 2018 02:49:36 GMT",
"version": "v2"
},
{
"created": "Sat, 16 May 2020 03:49:22 GMT",
"version": "v3"
},
{
"created": "Sat, 5 Sep 2020 04:21:28 GMT",
"version": "v4"
}
] | 2020-09-08 | [
[
"Huang",
"Jia-Hui",
""
],
[
"Zhang",
"Mu-Zi",
""
],
[
"Cao",
"Tian-Tian",
""
],
[
"Zou",
"Yi-Feng",
""
],
[
"Mai",
"Zhan-Feng",
""
]
] | When a scalar wave perturbation is properly scattering off a charged or rotating black hole, the energy of the reflected scalar wave may be amplified. This is a superradiant process. If this amplification process can occur back and forth through certain confining mechanism, it will lead to strong instability of the bla... |
1102.4572 | Lorenzo Iorio | Lorenzo Iorio | An Empirical Explanation of the Anomalous Increases in the Astronomical
Unit and the Lunar Eccentricity | Latex2e, no figures, no tables, 9 pages, 51 references. Published in
The Astronomical Journal (AJ) | Astron.J.142: 68, 2011 | 10.1088/0004-6256/142/3/68 | null | gr-qc astro-ph.EP physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Both the recently reported anomalous secular increase of the astronomical
unit, of the order of a few cm yr^-1, and of the eccentricity of the lunar
orbit e_ = (9+/-3) 10^-12 yr^-1 can be phenomenologically explained by
postulating that the acceleration of a test particle orbiting a central body,
in addition to usual... | [
{
"created": "Tue, 22 Feb 2011 18:23:15 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Apr 2011 07:04:45 GMT",
"version": "v2"
},
{
"created": "Tue, 3 May 2011 15:51:58 GMT",
"version": "v3"
},
{
"created": "Fri, 17 Jun 2011 20:39:27 GMT",
"version": "v4"
},
{
"cr... | 2011-07-26 | [
[
"Iorio",
"Lorenzo",
""
]
] | Both the recently reported anomalous secular increase of the astronomical unit, of the order of a few cm yr^-1, and of the eccentricity of the lunar orbit e_ = (9+/-3) 10^-12 yr^-1 can be phenomenologically explained by postulating that the acceleration of a test particle orbiting a central body, in addition to usual N... |
2302.11998 | Tsvetan Vetsov Assoc. Prof. Dr. | V. Avramov, H. Dimov, M. Radomirov, R. C. Rashkov, and T. Vetsov | On Thermodynamic Stability of Black Holes. Part I: Classical Stability | Minor update: 1. Conclusion revision, 2. Added missing references | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the classical thermodynamic stability of the standard black hole
solutions by implementing the intrinsic necessary and sufficient conditions for
stable global and local thermodynamic equilibrium. The criteria for such
equilibria are quite generic and well-established in classical thermodynamics,
but they h... | [
{
"created": "Thu, 23 Feb 2023 13:20:07 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Aug 2023 13:32:00 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Apr 2024 15:39:14 GMT",
"version": "v3"
}
] | 2024-04-02 | [
[
"Avramov",
"V.",
""
],
[
"Dimov",
"H.",
""
],
[
"Radomirov",
"M.",
""
],
[
"Rashkov",
"R. C.",
""
],
[
"Vetsov",
"T.",
""
]
] | We revisit the classical thermodynamic stability of the standard black hole solutions by implementing the intrinsic necessary and sufficient conditions for stable global and local thermodynamic equilibrium. The criteria for such equilibria are quite generic and well-established in classical thermodynamics, but they hav... |
2403.08467 | David Katona | David Katona | Uniqueness of extremal charged black holes in de Sitter | 18 pages, 2 figures | null | null | null | gr-qc hep-th math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove a uniqueness theorem for the charged Nariai black holes and
ultracold black holes in four dimensions. In particular, we show that an
analytic solution to four-dimensional Einstein-Maxwell theory with a positive
cosmological constant containing a static extremal Killing horizon with
spherical cross-sections o... | [
{
"created": "Wed, 13 Mar 2024 12:29:00 GMT",
"version": "v1"
}
] | 2024-03-14 | [
[
"Katona",
"David",
""
]
] | We prove a uniqueness theorem for the charged Nariai black holes and ultracold black holes in four dimensions. In particular, we show that an analytic solution to four-dimensional Einstein-Maxwell theory with a positive cosmological constant containing a static extremal Killing horizon with spherical cross-sections of ... |
1512.08755 | Hernando Quevedo | Sasha A. Zaldivar and Hernando Quevedo | Ideal quantum gases: A geometrothermodynamic approach | Final version published in Journal of Geometry and Physics 189
(2023): 104837 | Journal of Geometry and Physics 189 (2023): 104837 | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the fundamental thermodynamic equation for Fermi-Dirac and
Bose-Einstein quantum gases, which contains the first order contribution due to
the quantum nature of the gas particles. Then, we analyze the fundamental
equation in the context of geometrothermodynamics. Although the corresponding
Hamiltonian does ... | [
{
"created": "Tue, 29 Dec 2015 19:01:24 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Mar 2016 20:51:57 GMT",
"version": "v2"
},
{
"created": "Tue, 24 May 2016 02:06:27 GMT",
"version": "v3"
},
{
"created": "Thu, 21 Mar 2024 16:32:00 GMT",
"version": "v4"
}
] | 2024-03-22 | [
[
"Zaldivar",
"Sasha A.",
""
],
[
"Quevedo",
"Hernando",
""
]
] | We derive the fundamental thermodynamic equation for Fermi-Dirac and Bose-Einstein quantum gases, which contains the first order contribution due to the quantum nature of the gas particles. Then, we analyze the fundamental equation in the context of geometrothermodynamics. Although the corresponding Hamiltonian does no... |
1710.02607 | Miguel Cruz | Miguel Cruz, Norman Cruz and Samuel Lepe | Accelerated and decelerated expansion in a causal dissipative cosmology | 13 pages, 5 figures. Improved version accepted for publication in PRD | Phys. Rev. D 96, 124020 (2017) | 10.1103/PhysRevD.96.124020 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we explore a new cosmological solution for an universe filled
with one dissipative fluid, described by a barotropic EoS $p = \omega \rho$, in
the framework of the full Israel-Stewart theory. The form of the bulk viscosity
has been assumed of the form $\xi = \xi_{0}\rho^{1/2}$. The relaxation time is
take... | [
{
"created": "Fri, 6 Oct 2017 23:32:02 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Dec 2017 18:25:59 GMT",
"version": "v2"
}
] | 2017-12-20 | [
[
"Cruz",
"Miguel",
""
],
[
"Cruz",
"Norman",
""
],
[
"Lepe",
"Samuel",
""
]
] | In this work we explore a new cosmological solution for an universe filled with one dissipative fluid, described by a barotropic EoS $p = \omega \rho$, in the framework of the full Israel-Stewart theory. The form of the bulk viscosity has been assumed of the form $\xi = \xi_{0}\rho^{1/2}$. The relaxation time is taken ... |
2304.07209 | Aisha Rashid | M. Farasat Shamir, Mushtaq Ahmad, G. Mustafa, Aisha Rashid | Ricci Inverse Anisotropic Stellar Structures | 14 pages, 19 figures | Chin. J. Phys. 81 (2023) 51 | 10.1016/j.cjph.2022.11.011 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | This paper offers novel quintessence compact relativistic spherically
symmetrical anisotropic solutions under the recently developed Ricci inverse
gravity Amendola et al., 2020), by employing Krori and Barua gravitational
potentials, $Ar^2=\nu(r), ~\&~Br^2+C=\mu(r)$ (with A, B, and C being real
constants). For this o... | [
{
"created": "Fri, 14 Apr 2023 15:48:32 GMT",
"version": "v1"
}
] | 2023-04-17 | [
[
"Shamir",
"M. Farasat",
""
],
[
"Ahmad",
"Mushtaq",
""
],
[
"Mustafa",
"G.",
""
],
[
"Rashid",
"Aisha",
""
]
] | This paper offers novel quintessence compact relativistic spherically symmetrical anisotropic solutions under the recently developed Ricci inverse gravity Amendola et al., 2020), by employing Krori and Barua gravitational potentials, $Ar^2=\nu(r), ~\&~Br^2+C=\mu(r)$ (with A, B, and C being real constants). For this obj... |
1411.6513 | Alessio Belenchia | Alessio Belenchia, Dionigi M. T. Benincasa and Stefano Liberati | Nonlocal Scalar Quantum Field Theory from Causal Sets | 24 pages, 7 figures. Published in JHEP 1503 (2015) 036 | JHEP 1503 (2015) 036 | 10.1007/JHEP03(2015)036 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a non-local scalar quantum field theory in flat spacetime derived
from the dynamics of a scalar field on a causal set. We show that this
non-local QFT contains a continuum of massive modes in any dimension. In 2
dimensions the Hamiltonian is positive definite and therefore the quantum
theory is well-defined.... | [
{
"created": "Mon, 24 Nov 2014 16:28:59 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Mar 2015 19:48:30 GMT",
"version": "v2"
}
] | 2015-06-23 | [
[
"Belenchia",
"Alessio",
""
],
[
"Benincasa",
"Dionigi M. T.",
""
],
[
"Liberati",
"Stefano",
""
]
] | We study a non-local scalar quantum field theory in flat spacetime derived from the dynamics of a scalar field on a causal set. We show that this non-local QFT contains a continuum of massive modes in any dimension. In 2 dimensions the Hamiltonian is positive definite and therefore the quantum theory is well-defined. I... |
1105.6034 | Parthasarathi Mitra | A. Ghosh and P. Mitra | Black hole state counting in loop quantum gravity | 5 pages | Mod. Phys. Lett. A26 (2011) 1817 | 10.1142/S0217732311036073 | SINP/TNP/2011/05 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The two ways of counting microscopic states of black holes in the U(1)
formulation of loop quantum gravity, one counting all allowed spin network
labels j,m and the other only m labels, are discussed in some detail. The
constraints on m are clarified and the map between the flux quantum numbers and
m discussed. Confi... | [
{
"created": "Thu, 26 May 2011 08:29:09 GMT",
"version": "v1"
}
] | 2014-05-22 | [
[
"Ghosh",
"A.",
""
],
[
"Mitra",
"P.",
""
]
] | The two ways of counting microscopic states of black holes in the U(1) formulation of loop quantum gravity, one counting all allowed spin network labels j,m and the other only m labels, are discussed in some detail. The constraints on m are clarified and the map between the flux quantum numbers and m discussed. Configu... |
0705.3363 | G P Procopio | Alessandro Fabbri, Giovanni Paolo Procopio | The Holographic Interpretation of Hawking Radiation | 10 pages, 1 figure, Honorable Mention in the Gravity Research
Foundation Essay Competition 2007 | Int.J.Mod.Phys.D17:2433-2438,2009 | 10.1142/S0218271808014102 | DAMTP-2007-45 | gr-qc hep-th | null | Holography gives us a tool to view the Hawking effect from a new, classical
perspective. In the context of Randall-Sundrum braneworld models, we show that
the basic features of four-dimensional evaporating solutions are nicely
translated into classical five-dimensional language. This includes the dual
bulk descriptio... | [
{
"created": "Wed, 23 May 2007 12:48:04 GMT",
"version": "v1"
}
] | 2009-03-20 | [
[
"Fabbri",
"Alessandro",
""
],
[
"Procopio",
"Giovanni Paolo",
""
]
] | Holography gives us a tool to view the Hawking effect from a new, classical perspective. In the context of Randall-Sundrum braneworld models, we show that the basic features of four-dimensional evaporating solutions are nicely translated into classical five-dimensional language. This includes the dual bulk description ... |
2207.01150 | Emilio Rub\'in de Celis | E. Rub\'in de Celis and C. Simeone | Further considerations about the traversability of thin-shell wormholes | 15 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Traversability in relation with tides in thin-shell wormholes is revisited to
investigate the possibility of improving recently noted restrictive conditions
for a safe travel across a wormhole throat. We consider wormholes
mathematically constructed starting from background geometries which are
solutions of scalar-te... | [
{
"created": "Mon, 4 Jul 2022 00:35:38 GMT",
"version": "v1"
}
] | 2022-07-05 | [
[
"de Celis",
"E. Rubín",
""
],
[
"Simeone",
"C.",
""
]
] | Traversability in relation with tides in thin-shell wormholes is revisited to investigate the possibility of improving recently noted restrictive conditions for a safe travel across a wormhole throat. We consider wormholes mathematically constructed starting from background geometries which are solutions of scalar-tens... |
gr-qc/9512031 | Alexander Vilenkin | Alexander Vilenkin | Quantum Cosmology and the Constants of Nature | 12 pages; talk given at the RESCEU Symposium, Tokyo, Nov. 1995 | null | null | null | gr-qc astro-ph | null | In models where the constants of Nature can take more than one set of values,
the cosmological wave function $\psi$ describes an ensemble of universes with
different values of the constants. The probability distribution for the
constants can be determined with the aid of the `principle of mediocrity' which
asserts th... | [
{
"created": "Fri, 15 Dec 1995 12:34:34 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Vilenkin",
"Alexander",
""
]
] | In models where the constants of Nature can take more than one set of values, the cosmological wave function $\psi$ describes an ensemble of universes with different values of the constants. The probability distribution for the constants can be determined with the aid of the `principle of mediocrity' which asserts that... |
1808.09826 | Jun-Qi Guo | Jun-Qi Guo and Hongsheng Zhang | Dynamics of critical collapse | Title changed. 11 pages, 8 figures, 1 table | Eur. Phys. J. C 79, 625 (2019) | 10.1140/epjc/s10052-019-7144-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Critical collapse of a massless scalar field in spherical symmetry is
systematically studied. We combine numerical simulations and asymptotic
analysis, and synthesize critical collapse, spacetime singularities, and
complex science. First set of approximate analytic expressions near the center
are obtained. We observe... | [
{
"created": "Wed, 29 Aug 2018 13:49:45 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Oct 2018 10:37:38 GMT",
"version": "v2"
},
{
"created": "Sun, 28 Jul 2019 00:46:29 GMT",
"version": "v3"
}
] | 2019-07-30 | [
[
"Guo",
"Jun-Qi",
""
],
[
"Zhang",
"Hongsheng",
""
]
] | Critical collapse of a massless scalar field in spherical symmetry is systematically studied. We combine numerical simulations and asymptotic analysis, and synthesize critical collapse, spacetime singularities, and complex science. First set of approximate analytic expressions near the center are obtained. We observe t... |
1710.04485 | Farhad Darabi | Y. Heydarzade, F. Darabi | Surrounded Vaidya Solution by Cosmological Fields | 37 pages, 31 figures | Eur. Phys. J. C, (2018), 78:582 | 10.1140/epjc/s10052-018-6041-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present work, we study the general surrounded Vaidya solution by the
various cosmological fields and its nature describing the possibility of the
formation of naked singularities or black holes. Motivated by the fact that
real astrophysical black holes as non-stationary and non-isolated objects are
living in n... | [
{
"created": "Thu, 12 Oct 2017 12:58:45 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Dec 2018 11:15:08 GMT",
"version": "v2"
}
] | 2018-12-11 | [
[
"Heydarzade",
"Y.",
""
],
[
"Darabi",
"F.",
""
]
] | In the present work, we study the general surrounded Vaidya solution by the various cosmological fields and its nature describing the possibility of the formation of naked singularities or black holes. Motivated by the fact that real astrophysical black holes as non-stationary and non-isolated objects are living in non... |
1509.05297 | Alexandre Feller | Alexandre Feller, Etera R. Livine | Ising Spin Network States for Loop Quantum Gravity: a Toy Model for
Phase Transitions | 17 pages | Class.Quant.Grav. 33 (2016) 6, 065005 | 10.1088/0264-9381/33/6/065005 | null | gr-qc cond-mat.other | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Non-perturbative approaches to quantum gravity call for a deep understanding
of the emergence of geometry and locality from the quantum state of the
gravitational field. Without background geometry, the notion of distance should
entirely emerge from the correlations between the gravity fluctuations. In the
context of... | [
{
"created": "Thu, 17 Sep 2015 15:38:56 GMT",
"version": "v1"
}
] | 2016-03-23 | [
[
"Feller",
"Alexandre",
""
],
[
"Livine",
"Etera R.",
""
]
] | Non-perturbative approaches to quantum gravity call for a deep understanding of the emergence of geometry and locality from the quantum state of the gravitational field. Without background geometry, the notion of distance should entirely emerge from the correlations between the gravity fluctuations. In the context of l... |
gr-qc/0410123 | Christodoulakis Theodosios | T. Christodoulakis and Petros A. Terzis | Automorphisms and a Cartography of the Solution Space for Vacuum Bianchi
Cosmologies: The Type III Case | 19 pages, LatTex source file, no figures, accepted in JMP | J.Math.Phys. 47 (2006) 102502 | 10.1063/1.2359141 | null | gr-qc | null | The theory of symmetries of systems of coupled, ordinary differential
equations (ODE's) is used to develop a concise algorithm for cartographing the
space of solutions to vacuum Bianchi Einstein's Field Equations (EFE). The
symmetries used are the well known automorphisms of the Lie algebra for the
corresponding isom... | [
{
"created": "Tue, 26 Oct 2004 10:22:55 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Jul 2006 11:05:46 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Oct 2006 13:10:01 GMT",
"version": "v3"
}
] | 2015-06-25 | [
[
"Christodoulakis",
"T.",
""
],
[
"Terzis",
"Petros A.",
""
]
] | The theory of symmetries of systems of coupled, ordinary differential equations (ODE's) is used to develop a concise algorithm for cartographing the space of solutions to vacuum Bianchi Einstein's Field Equations (EFE). The symmetries used are the well known automorphisms of the Lie algebra for the corresponding isomet... |
1512.08953 | Dejan Gajic | Dejan Gajic | Linear waves in the interior of extremal black holes II | 68 pages, 3 figures | null | null | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider solutions to the linear wave equation in the interior region of
extremal Kerr black holes. We show that axisymmetric solutions can be extended
continuously beyond the Cauchy horizon and moreover that, if we assume suitably
fast polynomial decay in time along the event horizon, their local energy is
finite... | [
{
"created": "Wed, 30 Dec 2015 14:37:18 GMT",
"version": "v1"
}
] | 2015-12-31 | [
[
"Gajic",
"Dejan",
""
]
] | We consider solutions to the linear wave equation in the interior region of extremal Kerr black holes. We show that axisymmetric solutions can be extended continuously beyond the Cauchy horizon and moreover that, if we assume suitably fast polynomial decay in time along the event horizon, their local energy is finite. ... |
gr-qc/9708005 | Inyong Cho | Inyong Cho and Alexander Vilenkin | Spacetime structure of an inflating global monopole | 18 pages, REVTeX, 8 PostScript figures, submitted to the Physical
Review D | Phys.Rev. D56 (1997) 7621-7626 | 10.1103/PhysRevD.56.7621 | null | gr-qc astro-ph | null | The evolution of a global monopole with an inflating core is investigated. An
analytic expression for the exterior metric at large distances from the core is
obtained. The overall spacetime structure is studied numerically, both in
vacuum and in a radiation background.
| [
{
"created": "Mon, 4 Aug 1997 17:20:59 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Cho",
"Inyong",
""
],
[
"Vilenkin",
"Alexander",
""
]
] | The evolution of a global monopole with an inflating core is investigated. An analytic expression for the exterior metric at large distances from the core is obtained. The overall spacetime structure is studied numerically, both in vacuum and in a radiation background. |
gr-qc/0403098 | Ngangbam Ibohal | Ng Ibohal | Rotating metrics admitting non-perfect fluids in General Relativity | LaTex, 39 pages | Gen.Rel.Grav. 37 (2005) 19-51 | 10.1007/s10714-005-0002-6 | null | gr-qc | null | In this paper, by applying Newman-Janis algorithm in spherical symmetric
metrics, a class of embedded rotating solutions of field equations is
presented. These solutions admit non-perfect fluids
| [
{
"created": "Wed, 24 Mar 2004 07:24:50 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Ibohal",
"Ng",
""
]
] | In this paper, by applying Newman-Janis algorithm in spherical symmetric metrics, a class of embedded rotating solutions of field equations is presented. These solutions admit non-perfect fluids |
1411.2329 | Cosimo Bambi | Dan Liu, Zilong Li, Cosimo Bambi | Testing a class of non-Kerr metrics with hot spots orbiting SgrA$^*$ | 1+14 pages, 3 figures. v2: refereed version | JCAP 1501:020,2015 | 10.1088/1475-7516/2015/01/020 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | SgrA$^*$, the supermassive black hole candidate at the Galactic Center,
exhibits flares in the X-ray, NIR, and sub-mm bands that may be interpreted
within a hot spot model. Light curves and images of hot spots orbiting a black
hole are affected by a number of special and general relativistic effects, and
they can be ... | [
{
"created": "Mon, 10 Nov 2014 05:26:02 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Dec 2014 19:02:34 GMT",
"version": "v2"
}
] | 2015-01-15 | [
[
"Liu",
"Dan",
""
],
[
"Li",
"Zilong",
""
],
[
"Bambi",
"Cosimo",
""
]
] | SgrA$^*$, the supermassive black hole candidate at the Galactic Center, exhibits flares in the X-ray, NIR, and sub-mm bands that may be interpreted within a hot spot model. Light curves and images of hot spots orbiting a black hole are affected by a number of special and general relativistic effects, and they can be po... |
1903.07123 | Tevian Dray | Tevian Dray and Carlo Rovelli | Reflections on the Energy of Black Holes | Essay written for the Gravity Research Foundation 2019 Awards for
Essays on Gravitation | null | 10.1142/S0218271819440048 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inside a black hole, there is no local way to say which side of a sphere is
the inside, and which is the outside. One can easily be gulled by this fact
into mixing up the sign of the energy. We lead the reader astray with a na\"ive
treatment of the energy of a null shell in black hole spacetimes. We then
resolve the ... | [
{
"created": "Sun, 17 Mar 2019 16:26:19 GMT",
"version": "v1"
}
] | 2020-01-08 | [
[
"Dray",
"Tevian",
""
],
[
"Rovelli",
"Carlo",
""
]
] | Inside a black hole, there is no local way to say which side of a sphere is the inside, and which is the outside. One can easily be gulled by this fact into mixing up the sign of the energy. We lead the reader astray with a na\"ive treatment of the energy of a null shell in black hole spacetimes. We then resolve the co... |
2303.14251 | John Bayron Orjuela Quintana | J. Bayron Orjuela-Quintana, Savvas Nesseris | Tracking the validity of the quasi-static and sub-horizon approximations
in modified gravity | 28 pages, 18 figures. Changes match published version | null | 10.1088/1475-7516/2023/08/019 | IFT-UAM/CSIC-23-27 | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the framework of modified gravity (MG), the quasi-static (QS) and
sub-horizon (SH) approximations are widely used in analyses aiming to identify
departures from the concordance model at late-times. In general, it is assumed
that time derivatives are subdominant with respect to spatial derivatives given
that th... | [
{
"created": "Fri, 24 Mar 2023 19:31:38 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Aug 2023 12:26:15 GMT",
"version": "v2"
}
] | 2023-08-15 | [
[
"Orjuela-Quintana",
"J. Bayron",
""
],
[
"Nesseris",
"Savvas",
""
]
] | Within the framework of modified gravity (MG), the quasi-static (QS) and sub-horizon (SH) approximations are widely used in analyses aiming to identify departures from the concordance model at late-times. In general, it is assumed that time derivatives are subdominant with respect to spatial derivatives given that the ... |
1909.03887 | Shao-Wen Wei | Shao-Wen Wei, Yu-Xiao Liu, Robert B. Mann | Ruppeiner Geometry, Phase Transitions, and the Microstructure of Charged
AdS Black Holes | 31 pages and 17 figures. Seciton VII is added to discuss the
microstructures of Van der Waals fluids and black holes | Phys. Rev. D 100, 124033 (2019) | 10.1103/PhysRevD.100.124033 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Originally considered for van der Waals fluids and charged black holes [Phys.
Rev. Lett. 123, 071103 (2019)], we extend and generalize our approach to
higher-dimensional charged AdS black holes. Beginning with thermodynamic
fluctuations, we construct the line element of the Ruppeiner geometry and
obtain a universal f... | [
{
"created": "Mon, 9 Sep 2019 14:29:34 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Dec 2019 02:34:50 GMT",
"version": "v2"
}
] | 2019-12-24 | [
[
"Wei",
"Shao-Wen",
""
],
[
"Liu",
"Yu-Xiao",
""
],
[
"Mann",
"Robert B.",
""
]
] | Originally considered for van der Waals fluids and charged black holes [Phys. Rev. Lett. 123, 071103 (2019)], we extend and generalize our approach to higher-dimensional charged AdS black holes. Beginning with thermodynamic fluctuations, we construct the line element of the Ruppeiner geometry and obtain a universal for... |
2109.01193 | P. Vaishak | Vaishak Prasad | Generalized source multipole moments of dynamical horizons in binary
black hole mergers | 9 pages, 6 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we uncover new features in the evolution of the deformations of
the dynamical horizon geometry in a binary black hole merger scenario using
numerical relativity. First, in the inspiral phase, owing to the deformations,
the dynamical horizons of the two black holes are found to steadily acquire
multipole... | [
{
"created": "Thu, 2 Sep 2021 19:49:11 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Sep 2021 17:12:43 GMT",
"version": "v2"
},
{
"created": "Thu, 20 Jan 2022 18:40:43 GMT",
"version": "v3"
}
] | 2022-01-21 | [
[
"Prasad",
"Vaishak",
""
]
] | In this work, we uncover new features in the evolution of the deformations of the dynamical horizon geometry in a binary black hole merger scenario using numerical relativity. First, in the inspiral phase, owing to the deformations, the dynamical horizons of the two black holes are found to steadily acquire multipole m... |
gr-qc/0111004 | J. Brian Pitts | J. Brian Pitts, W.C. Schieve | Null Cones in Lorentz-Covariant General Relativity | groupoid nature of gauge transformations explained; shortened, new
references, 102 pages | null | null | null | gr-qc hep-th | null | The oft-neglected issue of the causal structure in the flat spacetime
approach to Einstein's theory of gravity is considered. Consistency requires
that the flat metric's null cone be respected, but this does not happen
automatically. After reviewing the history of this problem, we introduce a
generalized eigenvector ... | [
{
"created": "Fri, 2 Nov 2001 06:40:04 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Aug 2002 17:12:06 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"Pitts",
"J. Brian",
""
],
[
"Schieve",
"W. C.",
""
]
] | The oft-neglected issue of the causal structure in the flat spacetime approach to Einstein's theory of gravity is considered. Consistency requires that the flat metric's null cone be respected, but this does not happen automatically. After reviewing the history of this problem, we introduce a generalized eigenvector fo... |
1108.1158 | Michele Vallisneri | Michele Vallisneri | Beyond Fisher: exact sampling distributions of the maximum-likelihood
estimator in gravitational-wave parameter estimation | 4 pages, 3 figures, RevTeX 4.1. Fixed typos, revised for clarity | Phys. Rev. Lett. 107, 191104 (2011) | 10.1103/PhysRevLett.107.191104 | null | gr-qc physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational-wave astronomers often wish to characterize the expected
parameter-estimation accuracy of future observations. The Fisher matrix
provides a lower bound on the spread of the maximum-likelihood estimator across
noise realizations, as well as the leading-order width of the posterior
probability, but it is ... | [
{
"created": "Thu, 4 Aug 2011 18:24:50 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Nov 2011 23:37:08 GMT",
"version": "v2"
}
] | 2011-11-08 | [
[
"Vallisneri",
"Michele",
""
]
] | Gravitational-wave astronomers often wish to characterize the expected parameter-estimation accuracy of future observations. The Fisher matrix provides a lower bound on the spread of the maximum-likelihood estimator across noise realizations, as well as the leading-order width of the posterior probability, but it is li... |
2206.15246 | Lionel London | L. London and S. A. Hughes | Bi-orthogonal harmonics for the decomposition of gravitational radiation
II: applications for extreme and comparable mass-ratio black hole binaries | null | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The estimation of a physical system's normal modes is a fundamental problem
in physics. The quasi-normal modes of perturbed Kerr black holes, with their
related spheroidal harmonics, are key examples, and have diverse applications
in gravitational wave theory and data analysis. Recently, it has been shown
that \texti... | [
{
"created": "Thu, 30 Jun 2022 12:44:57 GMT",
"version": "v1"
}
] | 2022-07-01 | [
[
"London",
"L.",
""
],
[
"Hughes",
"S. A.",
""
]
] | The estimation of a physical system's normal modes is a fundamental problem in physics. The quasi-normal modes of perturbed Kerr black holes, with their related spheroidal harmonics, are key examples, and have diverse applications in gravitational wave theory and data analysis. Recently, it has been shown that \textit{... |
gr-qc/0310119 | Mauro Hueller | L. Carbone, A. Cavalleri, R. Dolesi, C. D. Hoyle, M. Hueller, S.
Vitale, W. J. Weber | Upper limits on stray force noise for LISA | To be published in Classical and Quantum Gravity, special issue on
Amaldi5 2003 conference proceedings (10 pages, 6 figures) | Class.Quant.Grav. 21 (2004) S611-S620 | 10.1088/0264-9381/21/5/033 | null | gr-qc | null | We have developed a torsion pendulum facility for LISA gravitational
reference sensor ground testing that allows us to put significant upper limits
on residual stray forces exerted by LISA-like position sensors on a
representative test mass and to characterize specific sources of disturbances
for LISA. We present her... | [
{
"created": "Tue, 28 Oct 2003 08:45:07 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Carbone",
"L.",
""
],
[
"Cavalleri",
"A.",
""
],
[
"Dolesi",
"R.",
""
],
[
"Hoyle",
"C. D.",
""
],
[
"Hueller",
"M.",
""
],
[
"Vitale",
"S.",
""
],
[
"Weber",
"W. J.",
""
]
] | We have developed a torsion pendulum facility for LISA gravitational reference sensor ground testing that allows us to put significant upper limits on residual stray forces exerted by LISA-like position sensors on a representative test mass and to characterize specific sources of disturbances for LISA. We present here ... |
0711.2033 | David Delphenich | David Delphenich | Transverse geometry and physical observers | 23 pages, no figures | null | null | null | gr-qc | null | It is proposed that the mathematical formalism that is most appropriate for
the study of spatially non-integrable cosmological models is the transverse
geometry of a one-dimensional foliation (congruence) defined by a physical
observer. By that means, one can discuss the geometry of space, as viewed by
that observer,... | [
{
"created": "Tue, 13 Nov 2007 17:16:11 GMT",
"version": "v1"
}
] | 2007-11-14 | [
[
"Delphenich",
"David",
""
]
] | It is proposed that the mathematical formalism that is most appropriate for the study of spatially non-integrable cosmological models is the transverse geometry of a one-dimensional foliation (congruence) defined by a physical observer. By that means, one can discuss the geometry of space, as viewed by that observer, w... |
2102.10797 | Kirill Bronnikov | Kirill A. Bronnikov, Vin\'icius A.G. Barcellos, Laura P. de Carvalh,
J\'ulio C. Fabris | The simplest wormhole in Rastall and k-essence theories | 15 pages, no figures | null | 10.1140/epjc/s10052-021-09164-y | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The geometry of the Ellis-Bronnikov wormhole is implemented in the Rastall
and k-essence theories of gravity with a self-interacting scalar field. The
form of the scalar field potential is determined in both cases. A stability
analysis with respect to spherically symmetric time-dependent perturbations is
carried out,... | [
{
"created": "Mon, 22 Feb 2021 06:30:57 GMT",
"version": "v1"
}
] | 2021-05-26 | [
[
"Bronnikov",
"Kirill A.",
""
],
[
"Barcellos",
"Vinícius A. G.",
""
],
[
"de Carvalh",
"Laura P.",
""
],
[
"Fabris",
"Júlio C.",
""
]
] | The geometry of the Ellis-Bronnikov wormhole is implemented in the Rastall and k-essence theories of gravity with a self-interacting scalar field. The form of the scalar field potential is determined in both cases. A stability analysis with respect to spherically symmetric time-dependent perturbations is carried out, a... |
1503.09054 | Ahmadjon Abdujabbarov | A. A. Abdujabbarov, L. Rezzolla and B. J. Ahmedov | A coordinate-independent characterization of a black hole shadow | 12 pages, 8 figures, accepted for publication on MNRAS | MNRAS 454, 2423 (2015) | 10.1093/mnras/stv2079 | null | gr-qc astro-ph.HE astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A large international effort is under way to assess the presence of a shadow
in the radio emission from the compact source at the centre of our Galaxy,
Sagittarius A$^*$ (Sgr A$^*$). If detected, this shadow would provide the first
direct evidence of the existence of black holes and that Sgr A$^*$ is a
supermassive b... | [
{
"created": "Mon, 30 Mar 2015 10:21:41 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Sep 2015 08:54:19 GMT",
"version": "v2"
}
] | 2016-06-03 | [
[
"Abdujabbarov",
"A. A.",
""
],
[
"Rezzolla",
"L.",
""
],
[
"Ahmedov",
"B. J.",
""
]
] | A large international effort is under way to assess the presence of a shadow in the radio emission from the compact source at the centre of our Galaxy, Sagittarius A$^*$ (Sgr A$^*$). If detected, this shadow would provide the first direct evidence of the existence of black holes and that Sgr A$^*$ is a supermassive bla... |
2112.13573 | Francisco A. Brito | M.A. Anacleto, F.A. Brito, G.C. Luna, E. Passos | The generalized uncertainty principle effect in acoustic black holes | 12 pages, no figures, version published in Annals of Physics | Annals Phys. 440 (2022) 168837 | 10.1016/j.aop.2022.168837 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We obtain an effective acoustic metric with quantum corrections that are
provided by a minimum length implemented by the generalized Heisenberg
uncertainty principle (GUP) in the Abelian Higgs model. The effective acoustic
metric now depends on the contribution of scalar and vector potentials. We also
explore the Haw... | [
{
"created": "Mon, 27 Dec 2021 08:50:45 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Mar 2022 09:16:35 GMT",
"version": "v2"
}
] | 2022-03-22 | [
[
"Anacleto",
"M. A.",
""
],
[
"Brito",
"F. A.",
""
],
[
"Luna",
"G. C.",
""
],
[
"Passos",
"E.",
""
]
] | We obtain an effective acoustic metric with quantum corrections that are provided by a minimum length implemented by the generalized Heisenberg uncertainty principle (GUP) in the Abelian Higgs model. The effective acoustic metric now depends on the contribution of scalar and vector potentials. We also explore the Hawki... |
1010.4211 | Alexandros P. Kouretsis | Alexandros P. Kouretsis and Christos G. Tsagas | Raychaudhuri's equation and aspects of relativistic charged collapse | Revised version, to appear in PRD | Phys.Rev.D82:124053,2010 | 10.1103/PhysRevD.82.124053 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the Raychaudhuri equation to probe certain aspects related to the
gravitational collapse of a charged medium. The aim is to identify the stresses
the Maxwell field exerts on the fluid and discuss their potential implications.
Particular attention is given to those stresses that resist contraction. After
lookin... | [
{
"created": "Wed, 20 Oct 2010 14:22:31 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Nov 2010 12:54:29 GMT",
"version": "v2"
}
] | 2011-01-17 | [
[
"Kouretsis",
"Alexandros P.",
""
],
[
"Tsagas",
"Christos G.",
""
]
] | We use the Raychaudhuri equation to probe certain aspects related to the gravitational collapse of a charged medium. The aim is to identify the stresses the Maxwell field exerts on the fluid and discuss their potential implications. Particular attention is given to those stresses that resist contraction. After looking ... |
2212.03755 | Alexander Petrov Nikolaevich | E.D. Emtsova, A.N. Petrov, A.V. Toporensky | Conserved quantities in STEGR and applications | Published Version | Eur. Phys. J. C (2023) 83:366 | 10.1140/epjc/s10052-023-11460-8 | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | We derive conservation laws in Symmetric Teleparallel Equivalent of General
Relativity (STEGR) with direct application of Noether's theorem. This approach
allows us to construct covariant conserved currents, corresponding
superpotentials and invariant charges. A necessary component of our
constructions is the concept... | [
{
"created": "Wed, 7 Dec 2022 16:27:42 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Jan 2023 12:42:47 GMT",
"version": "v2"
},
{
"created": "Fri, 31 Mar 2023 18:27:15 GMT",
"version": "v3"
},
{
"created": "Tue, 31 Oct 2023 17:59:59 GMT",
"version": "v4"
}
] | 2023-11-01 | [
[
"Emtsova",
"E. D.",
""
],
[
"Petrov",
"A. N.",
""
],
[
"Toporensky",
"A. V.",
""
]
] | We derive conservation laws in Symmetric Teleparallel Equivalent of General Relativity (STEGR) with direct application of Noether's theorem. This approach allows us to construct covariant conserved currents, corresponding superpotentials and invariant charges. A necessary component of our constructions is the concept o... |
1903.09311 | Faizuddin Ahmed | Faizuddin Ahmed and Hassan Hassanabadi | Spin-zero system of DKP equation in the background of a flat class of
G\"{o}del-type space-time | 16 pages, introduction section shorten and number of references
reduced, section 2 & 3 merged, overall presentation improved, Accepted for
publication in Mod. Phys. Lett. A | Mod. Phys. Lett. A 35, No. 07, 2050031 (2020) | 10.1142/S0217732320500315 | null | gr-qc hep-th math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the Duffin-Kemmer-Petiau (DKP) equation for
spin-zero system of charge-free particles in the background of a flat class of
G\"{o}del-type space-times, and evaluate the individual energy levels and
corresponding wave-functions, in details.
| [
{
"created": "Thu, 21 Mar 2019 13:21:44 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Sep 2019 05:18:50 GMT",
"version": "v2"
}
] | 2020-03-12 | [
[
"Ahmed",
"Faizuddin",
""
],
[
"Hassanabadi",
"Hassan",
""
]
] | In this paper, we investigate the Duffin-Kemmer-Petiau (DKP) equation for spin-zero system of charge-free particles in the background of a flat class of G\"{o}del-type space-times, and evaluate the individual energy levels and corresponding wave-functions, in details. |
0712.1462 | Raul Vera | Marc Mars, Jos\'e M. M. Senovilla and Ra\"ul Vera | Accelerating expansion and change of signature | LaTeX, 4 pages. Uses the eas.cls class. To appear in the proceedings
of the Spanish Relativity Meeting ERE'07 | null | 10.1051/eas:0830050 | null | gr-qc | null | We show that some types of sudden singularities admit a natural explanation
in terms of regular changes of signature on brane-worlds in AdS$_{5}$. The
present accelerated expansion of the Universe and its possible ending at a
sudden singularity may therefore simply be an indication that our braneworld is
about to cha... | [
{
"created": "Mon, 10 Dec 2007 16:31:47 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Mars",
"Marc",
""
],
[
"Senovilla",
"José M. M.",
""
],
[
"Vera",
"Raül",
""
]
] | We show that some types of sudden singularities admit a natural explanation in terms of regular changes of signature on brane-worlds in AdS$_{5}$. The present accelerated expansion of the Universe and its possible ending at a sudden singularity may therefore simply be an indication that our braneworld is about to chang... |
1511.00600 | Surajit Chattopadhyay | Antonio Pasqua, Surajit Chattopadhyay, Ratbay Myrzakulov | Consequences of three modified forms of holographic dark energy models
in bulk-brane interaction | 34 pages, 20 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the effects which are produced by the interaction
between a brane Universe and the bulk in which the Universe is embedded. Taking
into account the effects produced by the interaction between a brane Universe
and the bulk, we derived the Equation of State (EoS) parameter $\omega_D$ for
three di... | [
{
"created": "Thu, 22 Oct 2015 10:02:12 GMT",
"version": "v1"
}
] | 2015-11-03 | [
[
"Pasqua",
"Antonio",
""
],
[
"Chattopadhyay",
"Surajit",
""
],
[
"Myrzakulov",
"Ratbay",
""
]
] | In this paper, we study the effects which are produced by the interaction between a brane Universe and the bulk in which the Universe is embedded. Taking into account the effects produced by the interaction between a brane Universe and the bulk, we derived the Equation of State (EoS) parameter $\omega_D$ for three diff... |
gr-qc/0410068 | Peter Ostermann | Peter Ostermann | A Strange Detail Concerning the Variational Principle of General
Relativity Theory | This final arXiv-version v4 extended to 8 (+ 25) pages, 51 (+ 106
groups of) relations for article (+ appendix of detailed verification);
thanks to 1 particular hint after a public arXiv-request via v3 | null | null | null | gr-qc physics.hist-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A mathematical complication due to an unnecessary formal assumption
concerning the variational principle of general relativity theory, which
apparently bothered Einstein and Hilbert, is shown and cleared up. Some
historical confusion seems caused by the impossibility to use the conventional
Euler-Lagrange formalism d... | [
{
"created": "Fri, 15 Oct 2004 11:02:46 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Oct 2005 12:53:44 GMT",
"version": "v2"
},
{
"created": "Wed, 4 Dec 2013 19:04:38 GMT",
"version": "v3"
},
{
"created": "Tue, 11 Feb 2014 18:16:31 GMT",
"version": "v4"
}
] | 2014-02-12 | [
[
"Ostermann",
"Peter",
""
]
] | A mathematical complication due to an unnecessary formal assumption concerning the variational principle of general relativity theory, which apparently bothered Einstein and Hilbert, is shown and cleared up. Some historical confusion seems caused by the impossibility to use the conventional Euler-Lagrange formalism dir... |
1109.6577 | Benjamin C. Harms | Paul H. Cox, Benjamin C. Harms, Shaoqi Hou | Statistical Mechanics of Wormholes | 8 pages, 1 figure Corrected typo | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The statistical mechanics of a gas of Einstein-Kalb-Ramond wormholes is
studied in this paper. The wormholes studied are the result of sewing together
two Reissner-Nordstrom-type black hole metrics at their horizons. By requiring
the stress-energy tensor associated with this geometry to be that of a
Kalb-Ramond field... | [
{
"created": "Thu, 29 Sep 2011 16:15:22 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Oct 2011 16:30:13 GMT",
"version": "v2"
}
] | 2011-10-10 | [
[
"Cox",
"Paul H.",
""
],
[
"Harms",
"Benjamin C.",
""
],
[
"Hou",
"Shaoqi",
""
]
] | The statistical mechanics of a gas of Einstein-Kalb-Ramond wormholes is studied in this paper. The wormholes studied are the result of sewing together two Reissner-Nordstrom-type black hole metrics at their horizons. By requiring the stress-energy tensor associated with this geometry to be that of a Kalb-Ramond field, ... |
1307.1679 | Frank Hellmann | Frank Hellmann and Wojciech Kaminski | Holonomy spin foam models: Asymptotic geometry of the partition function | 63 pages, 5 figures v2: Reference corrected | null | 10.1007/JHEP10(2013)165 | null | gr-qc hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the asymptotic geometry of the spin foam partition function for a
large class of models, including the models of Barrett and Crane, Engle,
Pereira, Rovelli and Livine, and, Freidel and Krasnov.
The asymptotics is taken with respect to the boundary spins only, no
assumption of large spins is made in the int... | [
{
"created": "Fri, 5 Jul 2013 17:56:18 GMT",
"version": "v1"
},
{
"created": "Sun, 14 Jul 2013 14:55:01 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Hellmann",
"Frank",
""
],
[
"Kaminski",
"Wojciech",
""
]
] | We study the asymptotic geometry of the spin foam partition function for a large class of models, including the models of Barrett and Crane, Engle, Pereira, Rovelli and Livine, and, Freidel and Krasnov. The asymptotics is taken with respect to the boundary spins only, no assumption of large spins is made in the interio... |
2311.01863 | Dmitri Fursaev | D.V. Fursaev, E.A. Davydov, I.G. Pirozhenko, V.A. Tainov | Gravitational Waves Generated by Null Cosmic Strings | 30 paqes, 2 figures, v2, where a new section, comments and references
are added | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Null cosmic strings are shown to disturb gravitational fields of massive
bodies and create outgoing gravitational waves (GW). Perturbations of the
metric caused by a straight null string and a point-like massive source are
found as solutions to linearized Einstein equations on a flat space-time. An
analytic approxima... | [
{
"created": "Fri, 3 Nov 2023 12:12:36 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Apr 2024 12:17:06 GMT",
"version": "v2"
}
] | 2024-04-11 | [
[
"Fursaev",
"D. V.",
""
],
[
"Davydov",
"E. A.",
""
],
[
"Pirozhenko",
"I. G.",
""
],
[
"Tainov",
"V. A.",
""
]
] | Null cosmic strings are shown to disturb gravitational fields of massive bodies and create outgoing gravitational waves (GW). Perturbations of the metric caused by a straight null string and a point-like massive source are found as solutions to linearized Einstein equations on a flat space-time. An analytic approximati... |
gr-qc/0607035 | Richard O'Shaughenssy | Richard O'Shaughnessy | Coating thermal noise for arbitrary shaped beams | 3 pages. Originally performed in August 2004. Submitted to CQG. (v2)
: Corrections from referee and others | Class.Quant.Grav.23:7627-7630,2006 | 10.1088/0264-9381/23/24/N01 | null | gr-qc | null | Advanced LIGO's sensitivity will be limited by coating noise. Though this
noise depends on beam shape, and though nongaussian beams are being seriously
considered for advanced LIGO, no published analysis exists to compare the
quantitative thermal noise improvement alternate beams offer. In this paper, we
derive and d... | [
{
"created": "Mon, 10 Jul 2006 01:48:10 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Oct 2006 15:44:39 GMT",
"version": "v2"
}
] | 2009-04-03 | [
[
"O'Shaughnessy",
"Richard",
""
]
] | Advanced LIGO's sensitivity will be limited by coating noise. Though this noise depends on beam shape, and though nongaussian beams are being seriously considered for advanced LIGO, no published analysis exists to compare the quantitative thermal noise improvement alternate beams offer. In this paper, we derive and dis... |
2305.03337 | Hamid R. Bakhtiarizadeh | Hamid R. Bakhtiarizadeh and Hanif Golchin | Rotating black strings beyond Maxwell's electrodynamics | LaTex file, 21 pages, 4 figures, v2: version to appear in JCAP | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this paper, we investigate the asymptotically Anti de Sitter solutions of
rotating black strings coupled to Born-Infeld and Modified Maxwell non-linear
electrodynamics in the context of Einsteinian, Einsteinian cubic and
Einsteinian quartic gravity. By studying the near-horizon behavior of
solutions, we find the m... | [
{
"created": "Fri, 5 May 2023 07:41:31 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Dec 2023 17:30:51 GMT",
"version": "v2"
}
] | 2023-12-22 | [
[
"Bakhtiarizadeh",
"Hamid R.",
""
],
[
"Golchin",
"Hanif",
""
]
] | In this paper, we investigate the asymptotically Anti de Sitter solutions of rotating black strings coupled to Born-Infeld and Modified Maxwell non-linear electrodynamics in the context of Einsteinian, Einsteinian cubic and Einsteinian quartic gravity. By studying the near-horizon behavior of solutions, we find the mas... |
0801.1073 | Marek Szydlowski | Jakub Mielczarek, Marek Szydlowski | Emerging singularities in the bouncing loop cosmology | RevTeX4, 8 pages, 4 figures; v2 change of title, more discussion on
co-existence of singularity and bounce | Phys.Rev.D77:124008,2008 | 10.1103/PhysRevD.77.124008 | null | gr-qc hep-th | null | In this paper we calculate $\mathcal{O}(\mu^4)$ corrections from holonomies
in the Loop Quantum Gravity, usually not taken into account. Allowance of the
corrections of this kind is equivalent with the choice of the new quatization
scheme. Quantization ambiguities in the Loop Quantum Cosmology allow for this
addition... | [
{
"created": "Mon, 7 Jan 2008 17:24:11 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Feb 2008 13:39:04 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Mielczarek",
"Jakub",
""
],
[
"Szydlowski",
"Marek",
""
]
] | In this paper we calculate $\mathcal{O}(\mu^4)$ corrections from holonomies in the Loop Quantum Gravity, usually not taken into account. Allowance of the corrections of this kind is equivalent with the choice of the new quatization scheme. Quantization ambiguities in the Loop Quantum Cosmology allow for this additional... |
gr-qc/0506009 | A. Latif Choudhury | A. Latif Choudhury | Influence Of Collapsing Matter On The Enveloping Expanding Universe | 7 pages | null | null | null | gr-qc | null | Using a collapsing matter model at the center of an expanding universe as
described by Weinberg we assume a special type of generated pressure. This
pressure transmits into the surrounding expanding universe. Under certain
restriction the ensuing hubble parameter is positive. The deacceleration
parameter fluctuates w... | [
{
"created": "Wed, 1 Jun 2005 16:57:01 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Choudhury",
"A. Latif",
""
]
] | Using a collapsing matter model at the center of an expanding universe as described by Weinberg we assume a special type of generated pressure. This pressure transmits into the surrounding expanding universe. Under certain restriction the ensuing hubble parameter is positive. The deacceleration parameter fluctuates wit... |
1404.3518 | Stephane Fay | St\'ephane Fay | From inflation to late time acceleration with a decaying vacuum coupled
to radiation or matter | 9 pages, 7 figures | Phys. Rev. D 89, 063514 (2014) | 10.1103/PhysRevD.89.063514 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider General Relativity with matter and radiation, one of these fluids
being coupled to vacuum. We find that Universe dynamics starts by an inflation
phase if the coupled fluid has a negative energy density at early time. Then,
there is always a finite scale factor singularity but when vacuum and matter
are co... | [
{
"created": "Mon, 14 Apr 2014 09:56:08 GMT",
"version": "v1"
}
] | 2014-04-15 | [
[
"Fay",
"Stéphane",
""
]
] | We consider General Relativity with matter and radiation, one of these fluids being coupled to vacuum. We find that Universe dynamics starts by an inflation phase if the coupled fluid has a negative energy density at early time. Then, there is always a finite scale factor singularity but when vacuum and matter are coup... |
1510.01352 | Irina Dymnikova | Irina Dymnikova | Electromagnetic source for the Kerr-Newman geometry | 8 pages, 1 figure. arXiv admin note: substantial text overlap with
arXiv:1510.01126 | International Journal of Modern Physics D Vol. 24, No. 14 (2015)
1550094 (8 pages) | 10.1142/S0218271815500947 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Source-free equations of nonlinear electrodynamics minimally coupled to
gravity (NED-GR) admit regular axially symmetric asymptotically Kerr-Newman
solutions, which describe electrically charged rotating black holes and
spinning solitons. Asymptotic analysis of solutions shows the existence of de
Sitter vacuum interi... | [
{
"created": "Fri, 2 Oct 2015 13:28:21 GMT",
"version": "v1"
}
] | 2015-10-07 | [
[
"Dymnikova",
"Irina",
""
]
] | Source-free equations of nonlinear electrodynamics minimally coupled to gravity (NED-GR) admit regular axially symmetric asymptotically Kerr-Newman solutions, which describe electrically charged rotating black holes and spinning solitons. Asymptotic analysis of solutions shows the existence of de Sitter vacuum interior... |
2304.13647 | Francois Larrouturou | L. Blanchet, G. Faye, Q. Henry, F. Larrouturou and D. Trestini | Gravitational waves from compact binaries to the fourth post-Newtonian
order | Contribution to the 2023 Gravitation session of the 57th Rencontres
de Moriond. 5 pages, 1 figure; v2 : references added and minor changes in the
text | null | 10.58027/bsnq-2422 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | The precise knowledge of the gravitational phase evolution of compact
binaries is crucial to the data analysis for gravitational waves. Until
recently, it was known analytically (for non-spinning systems) up to the 3.5
post-Newtonian (PN) order, i.e. up to the $(v/c)^7$ correction beyond the
leading order quadrupole ... | [
{
"created": "Wed, 26 Apr 2023 16:10:31 GMT",
"version": "v1"
},
{
"created": "Wed, 3 May 2023 20:22:18 GMT",
"version": "v2"
}
] | 2024-01-23 | [
[
"Blanchet",
"L.",
""
],
[
"Faye",
"G.",
""
],
[
"Henry",
"Q.",
""
],
[
"Larrouturou",
"F.",
""
],
[
"Trestini",
"D.",
""
]
] | The precise knowledge of the gravitational phase evolution of compact binaries is crucial to the data analysis for gravitational waves. Until recently, it was known analytically (for non-spinning systems) up to the 3.5 post-Newtonian (PN) order, i.e. up to the $(v/c)^7$ correction beyond the leading order quadrupole fo... |
1511.08543 | Kiyoshi Shiraishi | Kiyoshi Shiraishi | Spinning a charged dilaton black hole | 6 pages, 2 figures | Physics Letters A166, Nos. 5&6, pp. 298-302 (1992) | 10.1016/0375-9601(92)90712-U | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A charged dilaton black hole which possesses infinitesimal angular momentum
is studied. We find that the gyromagnetic ratio of the dilaton black hole
depends not only on the parameter which appears in the interaction between the
dilaton and the electric field but also nonlinearly on the ratio of the charge
to the mas... | [
{
"created": "Fri, 27 Nov 2015 02:45:38 GMT",
"version": "v1"
}
] | 2015-11-30 | [
[
"Shiraishi",
"Kiyoshi",
""
]
] | A charged dilaton black hole which possesses infinitesimal angular momentum is studied. We find that the gyromagnetic ratio of the dilaton black hole depends not only on the parameter which appears in the interaction between the dilaton and the electric field but also nonlinearly on the ratio of the charge to the mass ... |
1607.07883 | Nematollah Riazi | S. N. Sajadi, N. Riazi | Thermodynamic Stability of Wormholes | 9 pages. arXiv admin note: text overlap with arXiv:1511.03508,
arXiv:1202.1706 by other authors The authors withdraw the manuscript
temporarily to remove the text overlaps | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In the context of GR, we study the thermodynamic stability of evolving
Lorentzian wormholes at the apparent horizon. The average pressure of the
anisotrropic components is considered as the pressure of the wormhole.
According to the requirements of stable equilibrium in conventional
thermodynamics, we calculate the h... | [
{
"created": "Tue, 26 Jul 2016 20:05:08 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jul 2016 10:56:28 GMT",
"version": "v2"
}
] | 2016-07-29 | [
[
"Sajadi",
"S. N.",
""
],
[
"Riazi",
"N.",
""
]
] | In the context of GR, we study the thermodynamic stability of evolving Lorentzian wormholes at the apparent horizon. The average pressure of the anisotrropic components is considered as the pressure of the wormhole. According to the requirements of stable equilibrium in conventional thermodynamics, we calculate the hea... |
2004.05879 | Roman Konoplya | R. A. Konoplya and M. S. Churilova | Non-evident stability of a Dirac field in Schwarzschild-de Sitter
spacetime | The problem was solved in an earlier publication by other authors | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Perturbations of the Dirac field in the Schwarzschild spacetime are
characterized by two wave equations (for two chiralities) with effective
potentials which are iso-spectral and one of which is positive definite.
Therefore, the stability of a Dirac field in the Schwarzschild background is
straightforward. This is no... | [
{
"created": "Mon, 13 Apr 2020 12:00:29 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Sep 2021 14:40:42 GMT",
"version": "v2"
}
] | 2021-09-22 | [
[
"Konoplya",
"R. A.",
""
],
[
"Churilova",
"M. S.",
""
]
] | Perturbations of the Dirac field in the Schwarzschild spacetime are characterized by two wave equations (for two chiralities) with effective potentials which are iso-spectral and one of which is positive definite. Therefore, the stability of a Dirac field in the Schwarzschild background is straightforward. This is not ... |
1511.03191 | Giulia Gubitosi | Giulia Gubitosi, Michele Arzano, Joao Magueijo | Quantization of fluctuations in DSR: the two-point function and beyond | 5 pages, 1 figure | Phys. Rev. D 93, 065027 (2016) | 10.1103/PhysRevD.93.065027 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the two-point function of a quantum field theory with de Sitter
momentum space (herein called DSR) can be expressed as the product of a
standard delta function and an energy-dependent factor. This is a highly
non-trivial technical result in any theory without a preferred frame. Applied
to models exhibiti... | [
{
"created": "Tue, 10 Nov 2015 17:19:59 GMT",
"version": "v1"
}
] | 2016-03-23 | [
[
"Gubitosi",
"Giulia",
""
],
[
"Arzano",
"Michele",
""
],
[
"Magueijo",
"Joao",
""
]
] | We show that the two-point function of a quantum field theory with de Sitter momentum space (herein called DSR) can be expressed as the product of a standard delta function and an energy-dependent factor. This is a highly non-trivial technical result in any theory without a preferred frame. Applied to models exhibiting... |
2111.15477 | Dr. Sudhaker Upadhyay | J. Sadeghi, B. Pourhassan, S. Noori Gashti and S. Upadhyay | Swampland Conjecture and Inflation Model from Brane Perspective | 21 pages, 15 captioned figures, Published in Physica Scripta | Phys. Scr. 96, 125317 (2021) | 10.1088/1402-4896/ac39bc | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Over the past few decades, inflation models have been studied by researchers
from different perspectives and conditions in order to introduce a model for
the expanding universe. In this paper, we introduce a modified $f(R)$
gravitational model as ($R+\gamma R^{p}$) in order to examine a new condition
for inflation mo... | [
{
"created": "Sun, 28 Nov 2021 13:06:47 GMT",
"version": "v1"
}
] | 2021-12-01 | [
[
"Sadeghi",
"J.",
""
],
[
"Pourhassan",
"B.",
""
],
[
"Gashti",
"S. Noori",
""
],
[
"Upadhyay",
"S.",
""
]
] | Over the past few decades, inflation models have been studied by researchers from different perspectives and conditions in order to introduce a model for the expanding universe. In this paper, we introduce a modified $f(R)$ gravitational model as ($R+\gamma R^{p}$) in order to examine a new condition for inflation mode... |
1701.00550 | Jonathan Blackman | Jonathan Blackman, Scott E. Field, Mark A. Scheel, Chad R. Galley,
Daniel A. Hemberger, Patricia Schmidt, Rory Smith | A Surrogate Model of Gravitational Waveforms from Numerical Relativity
Simulations of Precessing Binary Black Hole Mergers | 34 pages, 26 figures | Phys. Rev. D 95, 104023 (2017) | 10.1103/PhysRevD.95.104023 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the first surrogate model for gravitational waveforms from the
coalescence of precessing binary black holes. We call this surrogate model
NRSur4d2s. Our methodology significantly extends recently introduced
reduced-order and surrogate modeling techniques, and is capable of directly
modeling numerical relat... | [
{
"created": "Mon, 2 Jan 2017 23:06:19 GMT",
"version": "v1"
},
{
"created": "Wed, 3 May 2017 06:23:34 GMT",
"version": "v2"
}
] | 2017-05-24 | [
[
"Blackman",
"Jonathan",
""
],
[
"Field",
"Scott E.",
""
],
[
"Scheel",
"Mark A.",
""
],
[
"Galley",
"Chad R.",
""
],
[
"Hemberger",
"Daniel A.",
""
],
[
"Schmidt",
"Patricia",
""
],
[
"Smith",
"Rory",
""
... | We present the first surrogate model for gravitational waveforms from the coalescence of precessing binary black holes. We call this surrogate model NRSur4d2s. Our methodology significantly extends recently introduced reduced-order and surrogate modeling techniques, and is capable of directly modeling numerical relativ... |
1109.6801 | Gianluca Calcagni | Kinjal Banerjee, Gianluca Calcagni, Mercedes Mart\'in-Benito | Introduction to Loop Quantum Cosmology | null | SIGMA 8 (2012), 016, 73 pages | 10.3842/SIGMA.2012.016 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by-nc-sa/3.0/ | This is an introduction to loop quantum cosmology (LQC) reviewing mini- and
midisuperspace models as well as homogeneous and inhomogeneous effective
dynamics.
| [
{
"created": "Fri, 30 Sep 2011 11:51:27 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Mar 2012 07:32:27 GMT",
"version": "v2"
}
] | 2012-03-27 | [
[
"Banerjee",
"Kinjal",
""
],
[
"Calcagni",
"Gianluca",
""
],
[
"Martín-Benito",
"Mercedes",
""
]
] | This is an introduction to loop quantum cosmology (LQC) reviewing mini- and midisuperspace models as well as homogeneous and inhomogeneous effective dynamics. |
gr-qc/9804076 | null | R. Durrer, M. Gasperini, M. Sakellariadou and G. Veneziano | Seeds of large-scale anisotropy in string cosmology | 27 pages, LATEX, one figure included using epsf | Phys.Rev.D59:043511,1999 | 10.1103/PhysRevD.59.043511 | CERN-TH/98-69 | gr-qc astro-ph | null | Pre-big bang cosmology predicts tiny first-order dilaton and metric
perturbations at very large scales. Here we discuss the possibility that other
-- more copiously generated -- perturbations may act, at second order, as
scalar seeds of large-scale structure and CMB anisotropies. We study, in
particular, the cases of... | [
{
"created": "Tue, 28 Apr 1998 13:21:02 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Durrer",
"R.",
""
],
[
"Gasperini",
"M.",
""
],
[
"Sakellariadou",
"M.",
""
],
[
"Veneziano",
"G.",
""
]
] | Pre-big bang cosmology predicts tiny first-order dilaton and metric perturbations at very large scales. Here we discuss the possibility that other -- more copiously generated -- perturbations may act, at second order, as scalar seeds of large-scale structure and CMB anisotropies. We study, in particular, the cases of e... |
gr-qc/0402117 | Julio Cesar Fabris | F.G. Alvarenga, A.B. Batista, J.C. Fabris, S.V.B. Goncalves | Troubles with quantum anisotropic cosmological models: loss of unitarity | Latex file, 4 pages. To appear in the proceedings of the Tenth Marcel
Grossman Meeting | null | null | null | gr-qc | null | The anisotropic Bianchi I cosmological model coupled with perfect fluid is
quantized in the minisuperspace. The perfect fluid is described by using the
Schutz formalism which allows to attribute dynamical degrees of freedom to
matter. It is shown that the resulting model is non-unitary. This breaks the
equivalence be... | [
{
"created": "Wed, 25 Feb 2004 18:08:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Alvarenga",
"F. G.",
""
],
[
"Batista",
"A. B.",
""
],
[
"Fabris",
"J. C.",
""
],
[
"Goncalves",
"S. V. B.",
""
]
] | The anisotropic Bianchi I cosmological model coupled with perfect fluid is quantized in the minisuperspace. The perfect fluid is described by using the Schutz formalism which allows to attribute dynamical degrees of freedom to matter. It is shown that the resulting model is non-unitary. This breaks the equivalence betw... |
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