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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2309.03833 | Anson Chen | Anson Chen, Rachel Gray and Tessa Baker | Testing the nature of gravitational wave propagation using dark sirens
and galaxy catalogues | null | null | 10.1088/1475-7516/2024/02/035 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | The dark sirens method enables us to use gravitational wave events without
electromagnetic counterparts as tools for cosmology and tests of gravity.
Furthermore, the dark sirens analysis code gwcosmo can now robustly account for
information coming from both galaxy catalogues and the compact object mass
distribution. ... | [
{
"created": "Thu, 7 Sep 2023 16:48:14 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Sep 2023 12:22:43 GMT",
"version": "v2"
}
] | 2024-02-23 | [
[
"Chen",
"Anson",
""
],
[
"Gray",
"Rachel",
""
],
[
"Baker",
"Tessa",
""
]
] | The dark sirens method enables us to use gravitational wave events without electromagnetic counterparts as tools for cosmology and tests of gravity. Furthermore, the dark sirens analysis code gwcosmo can now robustly account for information coming from both galaxy catalogues and the compact object mass distribution. We... |
1001.2946 | Chikun Ding | Chikun Ding, Jiliang Jing | Deformation of contour and Hawking temperature | 14 pages, 1 figure, Accepted by CQG | Class. Quantum Grav. 27 (2010) 035004 | 10.1088/0264-9381/27/3/035004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It was found that, in an isotropic coordinate system, the tunneling approach
brings a factor of 1/2 for the Hawking temperature of a Schwarzschild black
hole. In this paper, we address this kind of problem by studying the relation
between the Hawking temperature and the deformation of integral contour for the
scalar ... | [
{
"created": "Mon, 18 Jan 2010 06:07:32 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Jan 2010 02:40:21 GMT",
"version": "v2"
}
] | 2010-01-19 | [
[
"Ding",
"Chikun",
""
],
[
"Jing",
"Jiliang",
""
]
] | It was found that, in an isotropic coordinate system, the tunneling approach brings a factor of 1/2 for the Hawking temperature of a Schwarzschild black hole. In this paper, we address this kind of problem by studying the relation between the Hawking temperature and the deformation of integral contour for the scalar an... |
2004.07925 | Muhammad Sharif | M. Sharif and Qanitah Ama-Tul-Mughani | Anisotropic Spherical Solutions through Extended Gravitational
Decoupling Approach | 32 pages, 11 figures | Ann. Phys. 415(2020)168122 | 10.1016/j.aop.2020.168122 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is devoted to evaluating exact anisotropic spherical solutions for
static self-gravitating systems through extended geometric deformation
decoupling technique. For this purpose, we consider an isotropic Tolman IV
solution and extend it to anisotropic domain by transforming both temporal as
well as radial m... | [
{
"created": "Mon, 13 Apr 2020 07:58:03 GMT",
"version": "v1"
}
] | 2020-04-22 | [
[
"Sharif",
"M.",
""
],
[
"Ama-Tul-Mughani",
"Qanitah",
""
]
] | This paper is devoted to evaluating exact anisotropic spherical solutions for static self-gravitating systems through extended geometric deformation decoupling technique. For this purpose, we consider an isotropic Tolman IV solution and extend it to anisotropic domain by transforming both temporal as well as radial met... |
0903.0505 | Carlos F. Sopuerta | Priscilla Canizares, Carlos F. Sopuerta (ICE, CSIC-IEEC) | An Efficient Pseudospectral Method for the Computation of the Self-force
on a Charged Particle: Circular Geodesics around a Schwarzschild Black Hole | 15 pages, 9 figures, Revtex 4. Minor changes to match published
version | Phys.Rev.D79:084020,2009 | 10.1103/PhysRevD.79.084020 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The description of the inspiral of a stellar-mass compact object into a
massive black hole sitting at a galactic centre is a problem of major relevance
for the future space-based gravitational-wave observatory LISA (Laser
Interferometer Space Antenna), as the signals from these systems will be buried
in the data stre... | [
{
"created": "Tue, 3 Mar 2009 11:52:13 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Apr 2009 15:12:27 GMT",
"version": "v2"
}
] | 2010-03-12 | [
[
"Canizares",
"Priscilla",
"",
"ICE, CSIC-IEEC"
],
[
"Sopuerta",
"Carlos F.",
"",
"ICE, CSIC-IEEC"
]
] | The description of the inspiral of a stellar-mass compact object into a massive black hole sitting at a galactic centre is a problem of major relevance for the future space-based gravitational-wave observatory LISA (Laser Interferometer Space Antenna), as the signals from these systems will be buried in the data stream... |
2206.02161 | Reggie Pantig | Reggie C. Pantig, Ali \"Ovg\"un | Testing dynamical torsion effects on the charged black hole's shadow,
deflection angle and greybody with M87* and Sgr. A* from EHT | 18 pages, 15 figures. Finalized version of the paper | Annals of Physics 448 (2023) 169197 | 10.1016/j.aop.2022.169197 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Poincar\'e Gauge's theory of gravity is the most noteworthy alternative
extension of general relativity that has a correspondence between spin and
spacetime geometry. In this paper, we use Reissner-Nordstrom-de Sitter and
anti-de Sitter solutions, where torsion $\tau$ is added as an independent
field, to analyze the ... | [
{
"created": "Sun, 5 Jun 2022 12:22:18 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Dec 2022 07:34:38 GMT",
"version": "v2"
}
] | 2022-12-23 | [
[
"Pantig",
"Reggie C.",
""
],
[
"Övgün",
"Ali",
""
]
] | Poincar\'e Gauge's theory of gravity is the most noteworthy alternative extension of general relativity that has a correspondence between spin and spacetime geometry. In this paper, we use Reissner-Nordstrom-de Sitter and anti-de Sitter solutions, where torsion $\tau$ is added as an independent field, to analyze the we... |
0803.1853 | Emanuele Berti | Nicolas Yunes and Emanuele Berti | Accuracy of the Post-Newtonian Approximation: Optimal Asymptotic
Expansion for Quasi-Circular, Extreme-Mass Ratio Inspirals | 17 pages, 14 figures, 5 Tables, 1 Appendix. We added an Erratum to
correct some mistakes in tables and figures. The main conclusions of the
original paper are still valid | Phys.Rev.D77:124006,2008; Erratum-ibid.D83:109901,2011 | 10.1103/PhysRevD.77.124006 10.1103/PhysRevD.83.109901 | IGC-08/3-1 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the accuracy of the post-Newtonian (PN) approximation and its formal
region of validity, by investigating its optimal asymptotic expansion for the
quasi-circular, adiabatic inspiral of a point particle into a Schwarzschild
black hole. By comparing the PN expansion of the energy flux to numerical
calculations... | [
{
"created": "Thu, 13 Mar 2008 18:15:43 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Mar 2011 20:11:03 GMT",
"version": "v2"
}
] | 2011-05-12 | [
[
"Yunes",
"Nicolas",
""
],
[
"Berti",
"Emanuele",
""
]
] | We study the accuracy of the post-Newtonian (PN) approximation and its formal region of validity, by investigating its optimal asymptotic expansion for the quasi-circular, adiabatic inspiral of a point particle into a Schwarzschild black hole. By comparing the PN expansion of the energy flux to numerical calculations i... |
gr-qc/9907034 | Philippe Ruelle | J.-M. Gerard and S. Pireaux | The observable light deflection angle | 11 pages, 1 figure | null | null | UCL-IPT-99-08 | gr-qc | null | The physical deflection angle of a light ray propagating in a space-time
supplied with an asymptotically flat metric has to be expressed in terms of the
impact parameter.
| [
{
"created": "Thu, 8 Jul 1999 08:38:58 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gerard",
"J. -M.",
""
],
[
"Pireaux",
"S.",
""
]
] | The physical deflection angle of a light ray propagating in a space-time supplied with an asymptotically flat metric has to be expressed in terms of the impact parameter. |
2101.02461 | Li-Ming Cao | Li-Ming Cao and Liang-Bi Wu | Hyperbolicity and Causality of Einstein-Gauss-Bonnet Gravity in Warped
Product Spacetimes | Revtex, 32 pages, 5 figures; two references added, typos corrected | Phys. Rev. D 103, 064054 (2021) | 10.1103/PhysRevD.103.064054 | ICTS-USTC/PCFT-21-02 | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In Einstein-Gauss-Bonnet gravity, for a group of warped product spacetimes,
we get a generalized master equation for the perturbation of tensor type. We
show that the "effective metric" or "acoustic metric" for the tensor
perturbation equation can be defined even without a static condition. Since
this master equation... | [
{
"created": "Thu, 7 Jan 2021 10:05:45 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jan 2021 10:42:45 GMT",
"version": "v2"
}
] | 2021-03-31 | [
[
"Cao",
"Li-Ming",
""
],
[
"Wu",
"Liang-Bi",
""
]
] | In Einstein-Gauss-Bonnet gravity, for a group of warped product spacetimes, we get a generalized master equation for the perturbation of tensor type. We show that the "effective metric" or "acoustic metric" for the tensor perturbation equation can be defined even without a static condition. Since this master equation d... |
2206.10887 | Mamma Emma | Mattia Emma, Federico Schianchi, Francesco Pannarale, Violetta Sagun
and Tim Dietrich | Numerical Simulations of Dark Matter Admixed Neutron Star Binaries | null | null | null | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Multi-messenger observations of compact binary mergers provide a new way to
constrain the nature of dark matter that may accumulate in and around neutron
stars. In this article, we extend the infrastructure of our
numerical-relativity code BAM to enable the simulation of neutron stars that
contain an additional mirro... | [
{
"created": "Wed, 22 Jun 2022 07:38:23 GMT",
"version": "v1"
}
] | 2022-06-23 | [
[
"Emma",
"Mattia",
""
],
[
"Schianchi",
"Federico",
""
],
[
"Pannarale",
"Francesco",
""
],
[
"Sagun",
"Violetta",
""
],
[
"Dietrich",
"Tim",
""
]
] | Multi-messenger observations of compact binary mergers provide a new way to constrain the nature of dark matter that may accumulate in and around neutron stars. In this article, we extend the infrastructure of our numerical-relativity code BAM to enable the simulation of neutron stars that contain an additional mirror ... |
1605.05356 | Eugenio Bianchi | Eugenio Bianchi, Jonathan Guglielmon, Lucas Hackl, Nelson Yokomizo | Squeezed vacua in loop quantum gravity | 14 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce squeezed vacua in loop quantum gravity, a new overcomplete basis
of states that contain prescribable correlations between geometric operators.
We study the behavior of long-range correlations and discuss the relevance of
these states for the reconstruction of a semiclassical spacetime from loop
quantum g... | [
{
"created": "Tue, 17 May 2016 20:35:46 GMT",
"version": "v1"
}
] | 2016-05-19 | [
[
"Bianchi",
"Eugenio",
""
],
[
"Guglielmon",
"Jonathan",
""
],
[
"Hackl",
"Lucas",
""
],
[
"Yokomizo",
"Nelson",
""
]
] | We introduce squeezed vacua in loop quantum gravity, a new overcomplete basis of states that contain prescribable correlations between geometric operators. We study the behavior of long-range correlations and discuss the relevance of these states for the reconstruction of a semiclassical spacetime from loop quantum gra... |
1805.04679 | Ramil Izmailov N | K. K. Nandi, R. N. Izmailov, E. R. Zhdanov and Amrita Bhattacharya | Strong field lensing by Damour-Solodukhin wormhole | 6 pages | JCAP 07 (2018) 027 | 10.1088/1475-7516/2018/07/027 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the strong field lensing observables for the Damour-Solodukhin
wormhole and examine how small the values of the deviation parameter $\lambda $
need be for reproducing the observables for the Schwarzschild black hole. While
the extremely tiny values of $\lambda$ indicated by the matter accretion or
Hawk... | [
{
"created": "Sat, 12 May 2018 07:27:21 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Nov 2023 08:48:52 GMT",
"version": "v2"
}
] | 2023-11-17 | [
[
"Nandi",
"K. K.",
""
],
[
"Izmailov",
"R. N.",
""
],
[
"Zhdanov",
"E. R.",
""
],
[
"Bhattacharya",
"Amrita",
""
]
] | We investigate the strong field lensing observables for the Damour-Solodukhin wormhole and examine how small the values of the deviation parameter $\lambda $ need be for reproducing the observables for the Schwarzschild black hole. While the extremely tiny values of $\lambda$ indicated by the matter accretion or Hawkin... |
2206.02453 | Sohrab Rahvar | Sohrab Rahvar | Hamiltonian Formalism for dynamics of particles in MOG | 5 pages, accepted in Monthly Notices of the Royal Astronomical
Society | null | 10.1093/mnras/stac1560 | null | gr-qc astro-ph.GA | http://creativecommons.org/licenses/by/4.0/ | MOG as a modified gravity theory is designed to be replaced with dark matter.
In this theory, in addition to the metric tensor, a massive vector is a gravity
field where each particle has a charge proportional to the inertial mass and
couples to the vector field through the four-velocity of a particle. In this
work, ... | [
{
"created": "Mon, 6 Jun 2022 09:32:46 GMT",
"version": "v1"
}
] | 2022-06-22 | [
[
"Rahvar",
"Sohrab",
""
]
] | MOG as a modified gravity theory is designed to be replaced with dark matter. In this theory, in addition to the metric tensor, a massive vector is a gravity field where each particle has a charge proportional to the inertial mass and couples to the vector field through the four-velocity of a particle. In this work, we... |
gr-qc/9707061 | Alfredo Vasquez | Alfredo V\'azquez-Cruz | Gravitational Properties of Quantum Bosonic Strings | Ph.D Thesis. 143 pages, 25 figures inluded. Primary Latex file:
Thesisroot.tex (56 subsidiary files). | null | null | null | gr-qc hep-th | null | In this thesis we are interested in the study of the gravitational properties
of quantum bosonic strings. We start by computing the quantum energy-momentum
tensor ${\hat T}^{\mu\nu}(x)$ for strings in Minkowski space-time. We perform
the calculation of its expectation value for different physical string states
both f... | [
{
"created": "Wed, 30 Jul 1997 14:29:00 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Jul 1997 08:16:00 GMT",
"version": "v2"
}
] | 2016-08-15 | [
[
"Vázquez-Cruz",
"Alfredo",
""
]
] | In this thesis we are interested in the study of the gravitational properties of quantum bosonic strings. We start by computing the quantum energy-momentum tensor ${\hat T}^{\mu\nu}(x)$ for strings in Minkowski space-time. We perform the calculation of its expectation value for different physical string states both for... |
0909.3014 | Galin Gyulchev | Galin N. Gyulchev, Stoytcho S. Yazadjiev | Analytical Kerr-Sen Dilaton-Axion Black Hole Lensing in the Weak
Deflection Limit | 36 pages, 8 figures | Phys.Rev.D81:023005,2010 | 10.1103/PhysRevD.81.023005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate analytically gravitational lensing by charged, stationary,
axially symmetric Kerr-Sen dilaton-axion black hole in the weak deflection
limit. Approximate solutions to the lightlike equations of motion are present
up to and including third-order terms in $M/b$, $a/b$ and $r_{\alpha}/b$, where
$M$ is the ... | [
{
"created": "Wed, 16 Sep 2009 15:06:03 GMT",
"version": "v1"
}
] | 2010-03-25 | [
[
"Gyulchev",
"Galin N.",
""
],
[
"Yazadjiev",
"Stoytcho S.",
""
]
] | We investigate analytically gravitational lensing by charged, stationary, axially symmetric Kerr-Sen dilaton-axion black hole in the weak deflection limit. Approximate solutions to the lightlike equations of motion are present up to and including third-order terms in $M/b$, $a/b$ and $r_{\alpha}/b$, where $M$ is the bl... |
1504.04746 | Javad Taghizadeh Firouzjaee | Rahim Moradi, Javad T. Firouzjaee and Reza Mansouri | Cosmological black holes: the spherical perfect fluid collapse with
pressure in a FRW background | 14 pages, 11 figures, a few discussion added accepted version for
Class. Quantum Grav. arXiv admin note: substantial text overlap with
arXiv:1301.1480 | Class. Quantum Grav. 32 (2015) 215001 | 10.1088/0264-9381/32/21/215001 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We have constructed a spherically symmetric structure model in a cosmological
background filled with perfect fluid with non-vanishing pressure as an exact
solution of Einstein equations using the Lema\^{i}tre solution. To study its
local and quasi-local characteristics including the novel features of its
central blac... | [
{
"created": "Sat, 18 Apr 2015 17:54:59 GMT",
"version": "v1"
},
{
"created": "Sun, 4 Oct 2015 05:08:51 GMT",
"version": "v2"
}
] | 2015-10-07 | [
[
"Moradi",
"Rahim",
""
],
[
"Firouzjaee",
"Javad T.",
""
],
[
"Mansouri",
"Reza",
""
]
] | We have constructed a spherically symmetric structure model in a cosmological background filled with perfect fluid with non-vanishing pressure as an exact solution of Einstein equations using the Lema\^{i}tre solution. To study its local and quasi-local characteristics including the novel features of its central black ... |
1401.1485 | Gil de Oliveira-Neto | G. Oliveira-Neto, M. Silva de Oliveira, G. A. Monerat and E. V.
Corr\^ea Silva | Noncommutativity in the early Universe | 25 pages and 13 figures. Modifications in the text and in the
references, 9 figures added | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present work, we study the noncommutative version of a quantum
cosmology model. The model has a Friedmann-Robertson-Walker geometry, the
matter content is a radiative perfect fluid and the spatial sections have zero
constant curvature. In this model the scale factor takes values in a bounded
domain. Therefore,... | [
{
"created": "Tue, 7 Jan 2014 19:58:22 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Jul 2014 22:05:02 GMT",
"version": "v2"
},
{
"created": "Thu, 18 Dec 2014 17:13:45 GMT",
"version": "v3"
},
{
"created": "Wed, 4 May 2016 15:22:49 GMT",
"version": "v4"
}
] | 2016-05-05 | [
[
"Oliveira-Neto",
"G.",
""
],
[
"de Oliveira",
"M. Silva",
""
],
[
"Monerat",
"G. A.",
""
],
[
"Silva",
"E. V. Corrêa",
""
]
] | In the present work, we study the noncommutative version of a quantum cosmology model. The model has a Friedmann-Robertson-Walker geometry, the matter content is a radiative perfect fluid and the spatial sections have zero constant curvature. In this model the scale factor takes values in a bounded domain. Therefore, i... |
2202.09343 | Maximiliano Ujevic | Maximiliano Ujevic, Alireza Rashti, Henrique Gieg, Wolfgang Tichy, Tim
Dietrich | High-accuracy high-mass ratio simulations for binary neutron stars and
their comparison to existing waveform models | 10 pages, 7 figures | null | 10.1103/PhysRevD.106.023029 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The subsequent observing runs of the advanced gravitational-wave detector
network will likely provide us with various gravitational-wave observations of
binary neutron star systems. For an accurate interpretation of these
detections, we need reliable gravitational-wave models. To test and to point
out how existing mo... | [
{
"created": "Fri, 18 Feb 2022 18:18:43 GMT",
"version": "v1"
}
] | 2022-08-17 | [
[
"Ujevic",
"Maximiliano",
""
],
[
"Rashti",
"Alireza",
""
],
[
"Gieg",
"Henrique",
""
],
[
"Tichy",
"Wolfgang",
""
],
[
"Dietrich",
"Tim",
""
]
] | The subsequent observing runs of the advanced gravitational-wave detector network will likely provide us with various gravitational-wave observations of binary neutron star systems. For an accurate interpretation of these detections, we need reliable gravitational-wave models. To test and to point out how existing mode... |
0706.0205 | David Coule | D. H. Coule | On initial conditions for inflationary and bouncing cosmologies | 28pages, updated | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the question of deriving initial conditions for scalar fields in
driving both an early and late quintessence phase. The dark energy field
presents an unresolved uniformity problem. Further difficulties with initial
conditions for assisted, kinetic and phantom inflation are presented. We review
the use of ... | [
{
"created": "Fri, 1 Jun 2007 19:34:26 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jun 2007 18:50:50 GMT",
"version": "v2"
},
{
"created": "Wed, 27 Jun 2007 17:38:27 GMT",
"version": "v3"
},
{
"created": "Thu, 20 Sep 2007 15:31:52 GMT",
"version": "v4"
},
{
"cr... | 2012-12-20 | [
[
"Coule",
"D. H.",
""
]
] | We consider the question of deriving initial conditions for scalar fields in driving both an early and late quintessence phase. The dark energy field presents an unresolved uniformity problem. Further difficulties with initial conditions for assisted, kinetic and phantom inflation are presented. We review the use of th... |
0708.1926 | Dirk Puetzfeld | Dirk Puetzfeld, Yuri N. Obukhov | Probing non-Riemannian spacetime geometry | 8 pages, 1 figure, matches published version including the erratum in
Phys. Lett. A 373 (2009) 1600 | Phys.Lett.A372:6711-6716,2008 | 10.1016/j.physleta.2008.09.041 | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The equations of motion for matter in non-Riemannian spacetimes are derived
via a multipole method. It is found that only test bodies with microstructure
couple to the non-Riemannian spacetime geometry. Consequently it is impossible
to detect spacetime torsion with the satellite experiment Gravity Probe B,
contrary t... | [
{
"created": "Tue, 14 Aug 2007 16:53:04 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Oct 2008 11:06:34 GMT",
"version": "v2"
},
{
"created": "Mon, 30 Mar 2009 11:48:11 GMT",
"version": "v3"
}
] | 2009-03-30 | [
[
"Puetzfeld",
"Dirk",
""
],
[
"Obukhov",
"Yuri N.",
""
]
] | The equations of motion for matter in non-Riemannian spacetimes are derived via a multipole method. It is found that only test bodies with microstructure couple to the non-Riemannian spacetime geometry. Consequently it is impossible to detect spacetime torsion with the satellite experiment Gravity Probe B, contrary to ... |
2307.04379 | Koray D\"uzta\c{s} | Koray D\"uzta\c{s} | Challenging event horizons with spin (3/2) fields | Published in EPJC | Eur. Phys. J. C (2023) 83:567 | 10.1140/epjc/s10052-023-11764-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We attempt to destroy the event horizons of Kerr black holes by perturbing
them with massless spin (3/2) fields. We carry out a detailed analysis by
incorporating the explicit form of the absorption probabilities and
backreaction effects due to the self energy of the test fields. For extremal
and nearly extremal blac... | [
{
"created": "Mon, 10 Jul 2023 07:25:44 GMT",
"version": "v1"
}
] | 2023-07-11 | [
[
"Düztaş",
"Koray",
""
]
] | We attempt to destroy the event horizons of Kerr black holes by perturbing them with massless spin (3/2) fields. We carry out a detailed analysis by incorporating the explicit form of the absorption probabilities and backreaction effects due to the self energy of the test fields. For extremal and nearly extremal black ... |
1606.07959 | Amir Hadi Ziaie | Hamid Shabani and Amir Hadi Ziaie | Stability of the Einstein static Universe in $f(R,T)$ gravity | 27 pages, 6 figures, major revision | Eur. Phys. J. C (2017) 77: 31 | 10.1140/epjc/s10052-017-4597-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Einstein static (ES) universe has played a major role in various emergent
scenarios recently proposed in order to cure the problem of initial singularity
of the standard model of cosmology. In the herein model, we study the existence
and stability of ES universe in the context of $f(R,T)$ modified theories of
gra... | [
{
"created": "Sat, 25 Jun 2016 20:13:54 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Sep 2016 08:26:19 GMT",
"version": "v2"
}
] | 2017-01-23 | [
[
"Shabani",
"Hamid",
""
],
[
"Ziaie",
"Amir Hadi",
""
]
] | The Einstein static (ES) universe has played a major role in various emergent scenarios recently proposed in order to cure the problem of initial singularity of the standard model of cosmology. In the herein model, we study the existence and stability of ES universe in the context of $f(R,T)$ modified theories of gravi... |
1809.00935 | Domenico Giulini J.W. | Daniel Pook-Kolb and Domenico Giulini | Numerical Approach for Corvino-Type Gluing of Brill-Lindquist Initial
Data | 16 pages, 11 figures | Classical and Quantum Gravity, Year 2019, Volume 36, Number 4,
Article 045011 (16 pages) | 10.1088/1361-6382/aaff0f | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Building on the work of Giulini and Holzegel (2005), a new numerical approach
is developed for computing Cauchy data for Einstein's equations by gluing a
Schwarzschild end to a Brill-Lindquist metric via a Corvino-type construction.
In contrast to, and in extension of, the numerical strategy of Doulis and Rinne
(2016... | [
{
"created": "Tue, 4 Sep 2018 13:15:30 GMT",
"version": "v1"
}
] | 2019-02-12 | [
[
"Pook-Kolb",
"Daniel",
""
],
[
"Giulini",
"Domenico",
""
]
] | Building on the work of Giulini and Holzegel (2005), a new numerical approach is developed for computing Cauchy data for Einstein's equations by gluing a Schwarzschild end to a Brill-Lindquist metric via a Corvino-type construction. In contrast to, and in extension of, the numerical strategy of Doulis and Rinne (2016),... |
1105.0636 | Alok Laddha | Alok Laddha, Madhavan Varadarajan | The Diffeomorphism Constraint Operator in Loop Quantum Gravity | 37 pages, 6 figures | Class.Quant.Grav. 28 (2011) 195010 | 10.1088/0264-9381/28/19/195010 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct the smeared diffeomorphism constraint operator at finite
triangulation from the basic holonomy- flux operators of Loop Quantum Gravity,
evaluate its continuum limit on the Lewandowski- Marolf habitat and show that
the action of the continuum operator provides an anomaly free representation of
the Lie alg... | [
{
"created": "Tue, 3 May 2011 17:19:04 GMT",
"version": "v1"
}
] | 2015-05-28 | [
[
"Laddha",
"Alok",
""
],
[
"Varadarajan",
"Madhavan",
""
]
] | We construct the smeared diffeomorphism constraint operator at finite triangulation from the basic holonomy- flux operators of Loop Quantum Gravity, evaluate its continuum limit on the Lewandowski- Marolf habitat and show that the action of the continuum operator provides an anomaly free representation of the Lie algeb... |
2109.13961 | Gregorio Carullo | Gregorio Carullo, Danny Laghi, Nathan K. Johnson-McDaniel, Walter Del
Pozzo and Oscar J.C. Dias, Mahdi Godazgar, Jorge E. Santos | Constraints on Kerr-Newman black holes from merger-ringdown
gravitational-wave observations | 21 pages, 11 figures, 4 tables. Matches published version | Phys. Rev. D 105, 062009 (2022) | 10.1103/PhysRevD.105.062009 | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a template to model the post-merger phase of a binary black hole
coalescence in the presence of a remnant $U(1)$ charge. We include the
quasi-normal modes typically dominant during a binary black hole coalescence,
$(\ell,m,n) = \{(2,2,0), (2,2,1)\}$ and also present analytical fits for the
quasinormal mo... | [
{
"created": "Tue, 28 Sep 2021 18:03:43 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Apr 2022 14:05:16 GMT",
"version": "v2"
}
] | 2022-04-12 | [
[
"Carullo",
"Gregorio",
""
],
[
"Laghi",
"Danny",
""
],
[
"Johnson-McDaniel",
"Nathan K.",
""
],
[
"Del Pozzo",
"Walter",
""
],
[
"Dias",
"Oscar J. C.",
""
],
[
"Godazgar",
"Mahdi",
""
],
[
"Santos",
"Jorge E.",... | We construct a template to model the post-merger phase of a binary black hole coalescence in the presence of a remnant $U(1)$ charge. We include the quasi-normal modes typically dominant during a binary black hole coalescence, $(\ell,m,n) = \{(2,2,0), (2,2,1)\}$ and also present analytical fits for the quasinormal mode... |
1809.06511 | Xi-Long Fan | Zhang Hongsheng, Fan Xilong | Poisson-Arago spot for gravitational waves | null | Sci. China-Phys. Mech. Astron. 64, 120462 (2021) | 10.1007/s11433-021-1764-y | LIGO-P1800127 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For the observer at infinity, a Schwarzschild black hole serves as an
attractive opaque disk with a radius of 3$\sqrt{3} M$ that will produce the
diffraction pattern of gravitational waves (GWs). In this study, we demonstrate
that a bright spot, which is a diffraction effect analogous to the
Poisson-Arago spot in opt... | [
{
"created": "Tue, 18 Sep 2018 02:39:32 GMT",
"version": "v1"
},
{
"created": "Tue, 11 May 2021 14:07:31 GMT",
"version": "v2"
},
{
"created": "Tue, 9 Nov 2021 06:17:51 GMT",
"version": "v3"
}
] | 2021-11-10 | [
[
"Hongsheng",
"Zhang",
""
],
[
"Xilong",
"Fan",
""
]
] | For the observer at infinity, a Schwarzschild black hole serves as an attractive opaque disk with a radius of 3$\sqrt{3} M$ that will produce the diffraction pattern of gravitational waves (GWs). In this study, we demonstrate that a bright spot, which is a diffraction effect analogous to the Poisson-Arago spot in optic... |
1804.08950 | Oliver J. Tattersall | Oliver J. Tattersall, Pedro G. Ferreira | Quasi-normal modes of black holes in Horndeski gravity | 10 pages, 4 figures. Submitted to PRD | Phys. Rev. D 97, 104047 (2018) | 10.1103/PhysRevD.97.104047 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the perturbations to General Relativistic black holes (i.e. those
without scalar hair) in Horndeski scalar-tensor gravity. First, we derive the
equations of odd and even parity perturbations of both the metric and scalar
field in the case of a Schwarzschild black hole, and show that the
gravitational waves e... | [
{
"created": "Tue, 24 Apr 2018 10:56:01 GMT",
"version": "v1"
}
] | 2018-05-30 | [
[
"Tattersall",
"Oliver J.",
""
],
[
"Ferreira",
"Pedro G.",
""
]
] | We study the perturbations to General Relativistic black holes (i.e. those without scalar hair) in Horndeski scalar-tensor gravity. First, we derive the equations of odd and even parity perturbations of both the metric and scalar field in the case of a Schwarzschild black hole, and show that the gravitational waves emi... |
2405.10321 | Jorge Russo | Jorge G. Russo | Probing Hidden Dimensions via Muon Lifetime Measurements | Honorable Mention in the Gravity Research Foundation 2024 Awards for
Essays on Gravitation. 11 pages | null | null | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of Kaluza-Klein theories, the time dilation of charged
particles in an external field depends on the charge in a specific way.
Experimental tests are proposed to search for extra dimensions using this
distinctive feature.
| [
{
"created": "Thu, 16 May 2024 17:59:52 GMT",
"version": "v1"
}
] | 2024-05-17 | [
[
"Russo",
"Jorge G.",
""
]
] | In the context of Kaluza-Klein theories, the time dilation of charged particles in an external field depends on the charge in a specific way. Experimental tests are proposed to search for extra dimensions using this distinctive feature. |
0704.0399 | Gerard Clement | G. Clement, J.C. Fabris and G.T. Marques | Hawking radiation of linear dilaton black holes | 9 pages | Phys.Lett.B651:54-57,2007 | 10.1016/j.physletb.2007.05.052 | LAPTH-1178/07 | gr-qc hep-th | null | We compute exactly the semi-classical radiation spectrum for a class of
non-asymptotically flat charged dilaton black holes, the so-called linear
dilaton black holes. In the high frequency regime, the temperature for these
black holes generically agrees with the surface gravity result. In the special
case where the b... | [
{
"created": "Tue, 3 Apr 2007 14:00:51 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Clement",
"G.",
""
],
[
"Fabris",
"J. C.",
""
],
[
"Marques",
"G. T.",
""
]
] | We compute exactly the semi-classical radiation spectrum for a class of non-asymptotically flat charged dilaton black holes, the so-called linear dilaton black holes. In the high frequency regime, the temperature for these black holes generically agrees with the surface gravity result. In the special case where the bla... |
2302.09038 | Raghvendra Singh | Raghvendra Singh, Kabir Khanna, Dawood Kothawala | Decoherence due to Spacetime Curvature | 8 pages, 2 figures, typos fixed | null | null | null | gr-qc hep-th quant-ph | http://creativecommons.org/licenses/by/4.0/ | There has been considerable interest over the past years in investigating the
role of gravity in quantum phenomenon such as entanglement and decoherence. In
particular, gravitational time dilation is believed to decohere superpositions
of center of mass of composite quantum systems. Since true effects of gravity
are ... | [
{
"created": "Fri, 17 Feb 2023 18:12:15 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Mar 2023 15:27:33 GMT",
"version": "v2"
}
] | 2023-04-03 | [
[
"Singh",
"Raghvendra",
""
],
[
"Khanna",
"Kabir",
""
],
[
"Kothawala",
"Dawood",
""
]
] | There has been considerable interest over the past years in investigating the role of gravity in quantum phenomenon such as entanglement and decoherence. In particular, gravitational time dilation is believed to decohere superpositions of center of mass of composite quantum systems. Since true effects of gravity are en... |
1710.07962 | Andrea Addazi AndAdd | Andrea Addazi, Antonino Marciano | Evaporation and Antievaporation instabilities | Accepted in Symmetry, invited by Prof.S.Odintsov for special issue | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review (anti)evaporation phenomena within the context of quantum gravity
and extended theories of gravity. The (anti)evaporation effect is an
instability of the black hole horizon discovered in many different scenarios:
quantum dilaton-gravity, $f(R)$-gravity, $f(T)$-gravity, string inspired black
holes and brane-... | [
{
"created": "Sun, 22 Oct 2017 15:27:19 GMT",
"version": "v1"
}
] | 2017-10-24 | [
[
"Addazi",
"Andrea",
""
],
[
"Marciano",
"Antonino",
""
]
] | We review (anti)evaporation phenomena within the context of quantum gravity and extended theories of gravity. The (anti)evaporation effect is an instability of the black hole horizon discovered in many different scenarios: quantum dilaton-gravity, $f(R)$-gravity, $f(T)$-gravity, string inspired black holes and brane-wo... |
1108.1496 | Theodore A. Jacobson | Ted Jacobson | Initial value constraints with tensor matter | 9 pages | null | 10.1088/0264-9381/28/24/245011 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In generally covariant metric gravity theories with tensor matter fields, the
initial value constraint equations, unlike in general relativity, are in
general not just the 0\mu-components of the metric field equation. This happens
because higher derivatives can occur in the matter stress tensor. A universal
form for ... | [
{
"created": "Sat, 6 Aug 2011 16:52:12 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Jacobson",
"Ted",
""
]
] | In generally covariant metric gravity theories with tensor matter fields, the initial value constraint equations, unlike in general relativity, are in general not just the 0\mu-components of the metric field equation. This happens because higher derivatives can occur in the matter stress tensor. A universal form for th... |
gr-qc/0605074 | Naresh Dadhich | Naresh Dadhich (IUCAA, Pune) | A Unified View of the Basic Forces | 4 pages, latex, To appear in Proceedings of the Einstein Centennial
Maeting, University of Kwazulu-Natal, Durban, Sept. 25-26, 2005 | null | null | null | gr-qc astro-ph hep-lat hep-ph hep-th | null | In this essay we wish to seek a unifying thread between the basic forces. We
propose that there exists a universal force which is shared by all that
physically exists. Universality is characterized by the two properties: (i)
universal linkage and (ii) long range. They uniquely identify Einstein gravity
as the unversa... | [
{
"created": "Fri, 12 May 2006 04:18:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dadhich",
"Naresh",
"",
"IUCAA, Pune"
]
] | In this essay we wish to seek a unifying thread between the basic forces. We propose that there exists a universal force which is shared by all that physically exists. Universality is characterized by the two properties: (i) universal linkage and (ii) long range. They uniquely identify Einstein gravity as the unversal ... |
2012.14428 | Behnam Pourhassan | Behnam Pourhassan, Mohsen Dehghani, Mir Faizal, Sanjib Dey | Non-Pertubative Quantum Corrections to a Born-Infeld Black Hole and its
Information Geometry | 17 pages, 15 figures. Accepted in Class. Quantum Grav | Class. Quantum Grav. 38 (2021) 105001 | 10.1088/1361-6382/abdf6f | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the non-perturbative quantum corrections to a Born-Infeld black hole
in a spherical cavity. These quantum corrections produce a non-trivial short
distances modification to the relation between the entropy and area of this
black hole. The non-perturbative quantum correction appears as an exponential
term in t... | [
{
"created": "Sat, 26 Dec 2020 20:34:53 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Jan 2021 05:34:44 GMT",
"version": "v2"
}
] | 2021-04-20 | [
[
"Pourhassan",
"Behnam",
""
],
[
"Dehghani",
"Mohsen",
""
],
[
"Faizal",
"Mir",
""
],
[
"Dey",
"Sanjib",
""
]
] | We study the non-perturbative quantum corrections to a Born-Infeld black hole in a spherical cavity. These quantum corrections produce a non-trivial short distances modification to the relation between the entropy and area of this black hole. The non-perturbative quantum correction appears as an exponential term in the... |
gr-qc/9806112 | Andrei V. Frolov | Andrei V. Frolov | Self-Similar Collapse of Scalar Field in Higher Dimensions | RevTex 3.1, 15 pages, 3 figures; references added | Class.Quant.Grav.16:407-417,1999 | 10.1088/0264-9381/16/2/007 | null | gr-qc | null | This paper constructs continuously self-similar solution of a spherically
symmetric gravitational collapse of a scalar field in n dimensions. The
qualitative behavior of these solutions is explained, and closed-form answers
are provided where possible. Equivalence of scalar field couplings is used to
show a way to ge... | [
{
"created": "Mon, 29 Jun 1998 00:44:30 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Nov 1998 19:29:52 GMT",
"version": "v2"
}
] | 2010-11-19 | [
[
"Frolov",
"Andrei V.",
""
]
] | This paper constructs continuously self-similar solution of a spherically symmetric gravitational collapse of a scalar field in n dimensions. The qualitative behavior of these solutions is explained, and closed-form answers are provided where possible. Equivalence of scalar field couplings is used to show a way to gene... |
2011.06466 | Grigory Volovik | G.E. Volovik | Combined Lorentz symmetry: lessons from superfluid 3He | 8 pages, no figures, accepted in J. Low Temp. Phys | null | 10.1007/s10909-021-02630-7 | null | gr-qc cond-mat.other hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the possibility of the scenario in which the $P$, $T$ and Lorentz
symmetry of the relativistic quantum vacuum are all the combined symmetries.
These symmetries emerge as a result of the symmetry breaking of the more
fundamental $P$, $T$ and Lorentz symmetries of the original vacuum, which is
invariant und... | [
{
"created": "Thu, 12 Nov 2020 16:17:40 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Aug 2021 17:25:21 GMT",
"version": "v10"
},
{
"created": "Mon, 27 Sep 2021 15:52:07 GMT",
"version": "v11"
},
{
"created": "Mon, 7 Dec 2020 10:55:46 GMT",
"version": "v2"
},
{
"c... | 2021-11-17 | [
[
"Volovik",
"G. E.",
""
]
] | We consider the possibility of the scenario in which the $P$, $T$ and Lorentz symmetry of the relativistic quantum vacuum are all the combined symmetries. These symmetries emerge as a result of the symmetry breaking of the more fundamental $P$, $T$ and Lorentz symmetries of the original vacuum, which is invariant under... |
2207.00057 | Vyacheslav Dokuchaev | V. A. Berezin and V. I. Dokuchaev | Cosmological particle creation in Weyl geometry | 18 pages | 2023 Class. Quantum Grav. 40 015006 | 10.1088/1361-6382/aca57e | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigated the possibility of the homogeneous and isotropic cosmological
solution in Weyl geometry, which differs from the Riemannian geometry by adding
the so called Weyl vector. The Weyl gravity is obtained by constructing the
gravitational Lagrangian both to be quadratic in curvatures and conformal
invariant.... | [
{
"created": "Thu, 30 Jun 2022 18:43:06 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Dec 2022 08:22:13 GMT",
"version": "v2"
}
] | 2022-12-06 | [
[
"Berezin",
"V. A.",
""
],
[
"Dokuchaev",
"V. I.",
""
]
] | We investigated the possibility of the homogeneous and isotropic cosmological solution in Weyl geometry, which differs from the Riemannian geometry by adding the so called Weyl vector. The Weyl gravity is obtained by constructing the gravitational Lagrangian both to be quadratic in curvatures and conformal invariant. I... |
2005.08426 | Luca Buoninfante | Luca Buoninfante | Echoes from corpuscular black holes | V2: 16 pages, 1 figure. Version accepted for publication in JCAP | null | 10.1088/1475-7516/2020/12/041 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the corpuscular picture of black hole there exists no geometric notion of
horizon which, instead, only emerges in the semi-classical limit. Therefore, it
is very natural to ask - what happens if we send a signal towards a corpuscular
black hole? We show that quantum effects at the horizon scale imply the
existence... | [
{
"created": "Mon, 18 May 2020 02:15:47 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Dec 2020 07:26:50 GMT",
"version": "v2"
}
] | 2021-01-06 | [
[
"Buoninfante",
"Luca",
""
]
] | In the corpuscular picture of black hole there exists no geometric notion of horizon which, instead, only emerges in the semi-classical limit. Therefore, it is very natural to ask - what happens if we send a signal towards a corpuscular black hole? We show that quantum effects at the horizon scale imply the existence o... |
0904.2577 | Enrico Barausse | Enrico Barausse (UMD), Luciano Rezzolla (AEI) | Predicting the direction of the final spin from the coalescence of two
black holes | 5 pages, 3 figures. Significant changes to text and figures to match
version accepted for publication in ApJ Letters | Astrophys.J.Lett.704:L40-L44,2009; Astrophys.J.704:L40-L44,2009 | 10.1088/0004-637X/704/1/L40 | null | gr-qc astro-ph.CO astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Knowledge of the spin of the black hole resulting from the merger of a
generic black-hole binary is of great importance for studying the cosmological
evolution of supermassive black holes. Several attempts have been made to model
the spin via simple expressions exploiting the results of numerical-relativity
simulatio... | [
{
"created": "Thu, 16 Apr 2009 22:16:20 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Sep 2009 16:57:19 GMT",
"version": "v2"
}
] | 2011-05-24 | [
[
"Barausse",
"Enrico",
"",
"UMD"
],
[
"Rezzolla",
"Luciano",
"",
"AEI"
]
] | Knowledge of the spin of the black hole resulting from the merger of a generic black-hole binary is of great importance for studying the cosmological evolution of supermassive black holes. Several attempts have been made to model the spin via simple expressions exploiting the results of numerical-relativity simulations... |
gr-qc/0209030 | Valdir B. Bezerra | Geusa de A. Marques (UFPb) and V. B. Bezerra (UFPb) | Hydrogen atom in the gravitational fields of topological defects | 17 pages, LATEX file | Phys.Rev. D66 (2002) 105011 | 10.1103/PhysRevD.66.105011 | null | gr-qc | null | We consider a hydrogen atom in the background spacetimes generated by an
infinitely thin cosmic string and by a point-like global monopole. In both
cases, we find the solutions of the corresponding Dirac equations and we
determine the energy levels of the atom. We investigate how the geometric and
topological feature... | [
{
"created": "Mon, 9 Sep 2002 17:54:06 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Marques",
"Geusa de A.",
"",
"UFPb"
],
[
"Bezerra",
"V. B.",
"",
"UFPb"
]
] | We consider a hydrogen atom in the background spacetimes generated by an infinitely thin cosmic string and by a point-like global monopole. In both cases, we find the solutions of the corresponding Dirac equations and we determine the energy levels of the atom. We investigate how the geometric and topological features ... |
1105.3385 | Johannes Tambornino | Etera R. Livine, Johannes Tambornino | Spinor Representation for Loop Quantum Gravity | 36 pages, minor corrections and improvements, matches published
version | J. Math. Phys. 53, 012503 (2012) | 10.1063/1.3675465 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a quantization of the loop gravity phase space purely in terms of
spinorial variables, which have recently been shown to provide a direct link
between spin network states and simplicial geometries. The natural Hilbert
space to represent these spinors is the Bargmann space of holomorphic
square-integrable f... | [
{
"created": "Tue, 17 May 2011 14:11:43 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Feb 2012 16:51:47 GMT",
"version": "v2"
}
] | 2012-02-03 | [
[
"Livine",
"Etera R.",
""
],
[
"Tambornino",
"Johannes",
""
]
] | We perform a quantization of the loop gravity phase space purely in terms of spinorial variables, which have recently been shown to provide a direct link between spin network states and simplicial geometries. The natural Hilbert space to represent these spinors is the Bargmann space of holomorphic square-integrable fun... |
2402.15336 | N V Krishnendu | N. V. Krishnendu and Sumanta Chakraborty | Probing black hole `charge' from the binary black hole inspiral | 13 pages, 9 figures, PRD Published version | Phys. Rev. D 109, 124047, Published 20 June 2024 | 10.1103/PhysRevD.109.124047 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent gravitational wave (GW) observations have enabled us to look beyond
the standard paradigm of gravitational physics, namely general relativity (GR).
Along with the mass and the angular momentum, which typical astrophysical black
holes (BHs) are endowed with, theories beyond GR generically induce `charge' to
the... | [
{
"created": "Fri, 23 Feb 2024 14:15:59 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Jun 2024 09:21:23 GMT",
"version": "v2"
}
] | 2024-06-25 | [
[
"Krishnendu",
"N. V.",
""
],
[
"Chakraborty",
"Sumanta",
""
]
] | Recent gravitational wave (GW) observations have enabled us to look beyond the standard paradigm of gravitational physics, namely general relativity (GR). Along with the mass and the angular momentum, which typical astrophysical black holes (BHs) are endowed with, theories beyond GR generically induce `charge' to these... |
gr-qc/0106050 | Ernst Schmutzer | E.Schmutzer | Dark Matter and Rotation Curves of Stars in Galaxies | 14 pages, 4 figures, LaTex | Astron. Nachr. 322 (2001) 103 | 10.1002/1521-3994(200106)322:2<103::AID-ASNA103>3.0.CO;2-V | null | gr-qc | null | The dark matter accretion theory (around a central body) of the author on the
basis of his 5-dimensional Projective Unified Field Theory (PUFT) is applied to
the orbital motion of stars around the center of the Galaxy. The departure of
the motion from Newtonian mechanics leads to approximately flat rotation curves
be... | [
{
"created": "Thu, 14 Jun 2001 14:56:02 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Schmutzer",
"E.",
""
]
] | The dark matter accretion theory (around a central body) of the author on the basis of his 5-dimensional Projective Unified Field Theory (PUFT) is applied to the orbital motion of stars around the center of the Galaxy. The departure of the motion from Newtonian mechanics leads to approximately flat rotation curves bein... |
2403.18709 | Zhengcheng Liang | Zheng-Cheng Liang, Zhi-Yuan Li, En-Kun Li, Jian-dong Zhang, and
Yi-Ming Hu | Revisiting Stochastic Gravitational-wave Background in the Strong Signal
Case | 11 pages, 7 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Weak-signal limit is often used in estimating stochastic gravitational-wave
background (SGWB) intensities. This approximation fails and the signal-to-noise
ratio (SNR) can be much weaker when background signals are loud compared to the
detector noise. In this work, we highlight this limitation for the SGWB
detection ... | [
{
"created": "Wed, 27 Mar 2024 15:57:30 GMT",
"version": "v1"
}
] | 2024-03-28 | [
[
"Liang",
"Zheng-Cheng",
""
],
[
"Li",
"Zhi-Yuan",
""
],
[
"Li",
"En-Kun",
""
],
[
"Zhang",
"Jian-dong",
""
],
[
"Hu",
"Yi-Ming",
""
]
] | Weak-signal limit is often used in estimating stochastic gravitational-wave background (SGWB) intensities. This approximation fails and the signal-to-noise ratio (SNR) can be much weaker when background signals are loud compared to the detector noise. In this work, we highlight this limitation for the SGWB detection us... |
1704.07211 | Aindri\'u Conroy Mr. | Aindri\'u Conroy | Infinite Derivative Gravity: A Ghost and Singularity-free Theory | PhD Thesis, April 2017, Lancaster University Physics Department, 146
pages, 5 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The objective of this thesis is to present a viable extension of general
relativity free from cosmological singularities. A viable cosmology, in this
sense, is one that is free from ghosts, tachyons or exotic matter, while
staying true to the theoretical foundations of General Relativity such as
general covariance, a... | [
{
"created": "Mon, 24 Apr 2017 13:30:19 GMT",
"version": "v1"
}
] | 2017-04-25 | [
[
"Conroy",
"Aindriú",
""
]
] | The objective of this thesis is to present a viable extension of general relativity free from cosmological singularities. A viable cosmology, in this sense, is one that is free from ghosts, tachyons or exotic matter, while staying true to the theoretical foundations of General Relativity such as general covariance, as ... |
2106.11555 | Weifeng Ding | Weifeng Ding, Zhaoying Wang | Laser propagation in Rindler accelerated reference frame based on matrix
optics | 7 pages,4 figures | null | 10.1364/OE.434951 | null | gr-qc physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Rindler spacetime describing a series of accelerating observers is Ricci
flat, but it still has novel optical effects. In the case of WKB approximation,
we derive the light geodesics in the Rindler frame based on the covariant wave
equation and geodesic equations. Then, we use ABCD matrix optics method to
explore... | [
{
"created": "Tue, 22 Jun 2021 06:20:46 GMT",
"version": "v1"
}
] | 2021-09-01 | [
[
"Ding",
"Weifeng",
""
],
[
"Wang",
"Zhaoying",
""
]
] | The Rindler spacetime describing a series of accelerating observers is Ricci flat, but it still has novel optical effects. In the case of WKB approximation, we derive the light geodesics in the Rindler frame based on the covariant wave equation and geodesic equations. Then, we use ABCD matrix optics method to explore t... |
1203.6448 | Kouji Nakamura | Kouji Nakamura | Gauge-invariant variables in general-relativistic perturbations:
globalization and zero-mode problem | (v1) 16 pages, no figure; (v2) 9 pages, no figure. Compactified for
"2012 Awards for Essays on Gravitation" promoted by Gravity Research
Foundation. References are deleted. no ingredients is changed. This version
received Honorable Mention for 2012 | International Journal of Modern Physics D Vol. 21, No. 11 (2012)
1242004 | 10.1142/S0218271812420047 | null | gr-qc astro-ph.CO hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An outline of a proof of the local decomposition of linear metric
perturbations into gauge-invariant and gauge-variant parts on an arbitrary
background spacetime is briefly explained. We explicitly construct the
gauge-invariant and gauge-variant parts of the linear metric perturbations
based on some assumptions. We a... | [
{
"created": "Thu, 29 Mar 2012 07:15:57 GMT",
"version": "v1"
},
{
"created": "Thu, 17 May 2012 07:24:34 GMT",
"version": "v2"
}
] | 2012-10-16 | [
[
"Nakamura",
"Kouji",
""
]
] | An outline of a proof of the local decomposition of linear metric perturbations into gauge-invariant and gauge-variant parts on an arbitrary background spacetime is briefly explained. We explicitly construct the gauge-invariant and gauge-variant parts of the linear metric perturbations based on some assumptions. We als... |
gr-qc/0211012 | Hanno Sahlmann | Abhay Ashtekar, Jerzy Lewandowski, and Hanno Sahlmann | Polymer and Fock representations for a Scalar field | 13 pages, no figures | Class.Quant.Grav. 20 (2003) L11-1 | 10.1088/0264-9381/20/1/103 | ESI-1233, CGPG-02/11-1 | gr-qc | null | In loop quantum gravity, matter fields can have support only on the
`polymer-like' excitations of quantum geometry, and their algebras of
observables and Hilbert spaces of states can not refer to a classical,
background geometry. Therefore, to adequately handle the matter sector, one has
to address two issues already... | [
{
"created": "Mon, 4 Nov 2002 17:59:27 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Ashtekar",
"Abhay",
""
],
[
"Lewandowski",
"Jerzy",
""
],
[
"Sahlmann",
"Hanno",
""
]
] | In loop quantum gravity, matter fields can have support only on the `polymer-like' excitations of quantum geometry, and their algebras of observables and Hilbert spaces of states can not refer to a classical, background geometry. Therefore, to adequately handle the matter sector, one has to address two issues already a... |
gr-qc/9608068 | null | Bj{\o}rn Jensen and Svend E. Hjelmeland | A stringy black string and a stringy black hole in four dimensions | 4 pages, twocolumn, Revtex, no figures. New results and references
added. Presentation and discussion improved | null | null | OSLO-TP-8-96 | gr-qc | null | We uplift the static three dimensional black hole solution found by Banados,
Teitelboim and Zanelli (BTZ) into four dimensional space time. In this way we
obtain a black string solution with a relativistic string source, as well as a
new black hole solution which is also generated by a relativistic ``stringy''
source... | [
{
"created": "Thu, 29 Aug 1996 13:29:47 GMT",
"version": "v1"
},
{
"created": "Sun, 1 Sep 1996 12:41:28 GMT",
"version": "v2"
},
{
"created": "Mon, 23 Sep 1996 10:35:05 GMT",
"version": "v3"
}
] | 2008-02-03 | [
[
"Jensen",
"Bjørn",
""
],
[
"Hjelmeland",
"Svend E.",
""
]
] | We uplift the static three dimensional black hole solution found by Banados, Teitelboim and Zanelli (BTZ) into four dimensional space time. In this way we obtain a black string solution with a relativistic string source, as well as a new black hole solution which is also generated by a relativistic ``stringy'' source. ... |
1004.2477 | Jolyon Bloomfield | Jolyon K. Bloomfield and \'Eanna \'E. Flanagan | A four-dimensional description of five-dimensional N-brane models | 26 pages, 1 figure. Version 2 adds a new section 2, and clarifies
sections 4 and 5C | Phys.Rev.D82:124013,2010 | 10.1103/PhysRevD.82.124013 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new method for obtaining the four-dimensional effective
gravitational theory for five-dimensional braneworld models with arbitrary
numbers of branes in a low energy regime, based on a two-lengthscale expansion.
The method is straightforward and computationally efficient, and is applicable
to both compact... | [
{
"created": "Wed, 14 Apr 2010 19:16:41 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Sep 2010 21:28:53 GMT",
"version": "v2"
}
] | 2011-12-02 | [
[
"Bloomfield",
"Jolyon K.",
""
],
[
"Flanagan",
"Éanna É.",
""
]
] | We propose a new method for obtaining the four-dimensional effective gravitational theory for five-dimensional braneworld models with arbitrary numbers of branes in a low energy regime, based on a two-lengthscale expansion. The method is straightforward and computationally efficient, and is applicable to both compactif... |
2110.15046 | Aleksandr Kulitskii | Aleksadr Kulitskii and Elena Melkumova | Newman-Penrose-Debye formalism for fields of various spins in pp-wave
backgrounds | null | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using Newman-Penrose formalism in tetrad and spinor notation, we perform
separation of variables in the wave equations for massless fields of various
spins s=1/2, 1, 3/2, 2 on the background of exact plane-fronted gravitational
wave metrics. Then, applying Wald's method of adjoint operators, we derive
equations for D... | [
{
"created": "Thu, 28 Oct 2021 12:19:50 GMT",
"version": "v1"
}
] | 2021-10-29 | [
[
"Kulitskii",
"Aleksadr",
""
],
[
"Melkumova",
"Elena",
""
]
] | Using Newman-Penrose formalism in tetrad and spinor notation, we perform separation of variables in the wave equations for massless fields of various spins s=1/2, 1, 3/2, 2 on the background of exact plane-fronted gravitational wave metrics. Then, applying Wald's method of adjoint operators, we derive equations for Deb... |
1111.5043 | Gregory L. Comer | G. L. Comer, Patrick Peter, N. Andersson | Multi-fluid cosmology: An illustration of fundamental principles | 12 pages, 6 figures, version taking account of referee remarks | Physical Review D 85 (2012) 103006 | 10.1103/PhysRevD.85.103006 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Our current understanding of the Universe depends on the interplay of several
distinct "matter" components, which interact mainly through gravity, and
electromagnetic radiation. The nature of the different components, and possible
interactions, tends to be based on the notion of coupled perfect fluids (or
scalar fiel... | [
{
"created": "Mon, 21 Nov 2011 21:54:48 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Mar 2012 21:27:34 GMT",
"version": "v2"
}
] | 2012-08-28 | [
[
"Comer",
"G. L.",
""
],
[
"Peter",
"Patrick",
""
],
[
"Andersson",
"N.",
""
]
] | Our current understanding of the Universe depends on the interplay of several distinct "matter" components, which interact mainly through gravity, and electromagnetic radiation. The nature of the different components, and possible interactions, tends to be based on the notion of coupled perfect fluids (or scalar fields... |
1901.03755 | E. Harikumar | Bhanu Kiran. S, E. Harikumar and Vishnu Rajagopal | Superdense star in a space-time with minimal length | 25 pages, 3 figures | Mod. Phys. Lett A 34(2019) 1050116 | 10.1142/S0217732319501165 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we generalise core-envelope model of superdense star to a
non-commutative space-time and study the modifications due to the existence of
a minimal length, predicted by various approaches to quantum gravity. We first
derive Einstein's field equation in $\kappa$-deformed space-time and use this
to set up ... | [
{
"created": "Mon, 7 Jan 2019 04:51:55 GMT",
"version": "v1"
}
] | 2019-05-13 | [
[
"S",
"Bhanu Kiran.",
""
],
[
"Harikumar",
"E.",
""
],
[
"Rajagopal",
"Vishnu",
""
]
] | In this paper we generalise core-envelope model of superdense star to a non-commutative space-time and study the modifications due to the existence of a minimal length, predicted by various approaches to quantum gravity. We first derive Einstein's field equation in $\kappa$-deformed space-time and use this to set up no... |
1312.6790 | Rituparno Goswami | Anne Marie Nzioki, Rituparno Goswami and Peter K. S. Dunsby | Jebsen-Birkhoff theorem and its stability in f(R) gravity | 11 pages, Revtex4-1. arXiv admin note: text overlap with
arXiv:1101.4520 | Phys. Rev. D 89, 064050 (2014) | 10.1103/PhysRevD.89.064050 | null | gr-qc astro-ph.SR hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove a Jebsen-Birkhoff like theorem for f(R) theories of gravity in order
to to find the necessary conditions required for the existence of the
Schwarzschild solution in these theories and demonstrate that the rigidity of
such solutions of f(R) gravity is valid even in the perturbed scenario.
| [
{
"created": "Tue, 24 Dec 2013 10:42:40 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Nzioki",
"Anne Marie",
""
],
[
"Goswami",
"Rituparno",
""
],
[
"Dunsby",
"Peter K. S.",
""
]
] | We prove a Jebsen-Birkhoff like theorem for f(R) theories of gravity in order to to find the necessary conditions required for the existence of the Schwarzschild solution in these theories and demonstrate that the rigidity of such solutions of f(R) gravity is valid even in the perturbed scenario. |
1506.04008 | Guihua Tian | Guihua Tian and Huihui Wang | Research on the recurrence relations for the spin-weighted spheroidal
harmonics | some modification, including some formula, error corrected | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the recurrence relations in the spin-weighted
spheroidal harmonics (SWSHs) through super-symmetric quantum mechanics. We use
the shape invariance property to solve the spin-weighted spheroidal wave
equations. The result shows the relation among SWSHs with a special condition
of the same paramet... | [
{
"created": "Wed, 10 Jun 2015 04:13:47 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Oct 2015 07:28:17 GMT",
"version": "v2"
}
] | 2015-10-26 | [
[
"Tian",
"Guihua",
""
],
[
"Wang",
"Huihui",
""
]
] | In this paper we study the recurrence relations in the spin-weighted spheroidal harmonics (SWSHs) through super-symmetric quantum mechanics. We use the shape invariance property to solve the spin-weighted spheroidal wave equations. The result shows the relation among SWSHs with a special condition of the same parameter... |
1709.08732 | Joao Paulo Morais Graca | J. P. Morais Gra\c{c}a, A. de P\'adua Santos, Eug\^enio R. Bezerra de
Mello, and V. B. Bezerra | Non-Abelian cosmic string in the Starobinsky model of gravity | 16 pages, 9 figures, accepted for publication in IJMPD | null | 10.1142/S0218271818500128 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we analyze numerically the behaviour of the solutions
corresponding to a non-Abelian cosmic string in the framework of the
Starobinsky model, i.e. where $f(R)=R + \zeta R^2$. We perform the calculations
for both an asymptotically flat and asymptotically (anti)de Sitter spacetimes.
We found that the ang... | [
{
"created": "Mon, 25 Sep 2017 21:59:31 GMT",
"version": "v1"
}
] | 2018-02-14 | [
[
"Graça",
"J. P. Morais",
""
],
[
"Santos",
"A. de Pádua",
""
],
[
"de Mello",
"Eugênio R. Bezerra",
""
],
[
"Bezerra",
"V. B.",
""
]
] | In this paper, we analyze numerically the behaviour of the solutions corresponding to a non-Abelian cosmic string in the framework of the Starobinsky model, i.e. where $f(R)=R + \zeta R^2$. We perform the calculations for both an asymptotically flat and asymptotically (anti)de Sitter spacetimes. We found that the angul... |
gr-qc/9811054 | Laszlo A. Gergely | L\'aszl\'o \'A. Gergely | Colliding spherically symmetric null dust in equilibrium | 4 pages, 1 figure, sprocl.sty included, to appear in the Proceedings
of the ERES98 Conference | null | null | null | gr-qc | null | We present two recently obtained solutions of the Einstein equations with
spherical symmetry and one additional Killing vector, describing colliding null
dust streams.
| [
{
"created": "Tue, 17 Nov 1998 13:29:01 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gergely",
"László Á.",
""
]
] | We present two recently obtained solutions of the Einstein equations with spherical symmetry and one additional Killing vector, describing colliding null dust streams. |
0810.4031 | Tatyana P. Shestakova | T. P. Shestakova | The "extended phase space" approach to quantum geometrodynamics: what
can it give for the development of quantum gravity? | 12 pages, talk presented at the III Stueckelberg Workshop on
Relativistic Field Theories, Pescara, Italy, July 2008 | Proceedings of the 3rd Stueckelberg Workshop on Relativistic Field
Theories, eds. N. Carlevaro, R. Ruffini and G. V. Vereshchagin, Cambridge
Scientific Publishers, 2010, P. 293 - 301 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The talk is devoted to the "extended phase space" approach to Quantum
Geometrodynamics. The premises that have led to the formulation of this
approach are briefly reviewed, namely, non-trivial topology of the Universe
which implies the absence of asymptotic states, in contrast to situations one
usually deals in ordin... | [
{
"created": "Wed, 22 Oct 2008 11:07:14 GMT",
"version": "v1"
}
] | 2011-01-18 | [
[
"Shestakova",
"T. P.",
""
]
] | The talk is devoted to the "extended phase space" approach to Quantum Geometrodynamics. The premises that have led to the formulation of this approach are briefly reviewed, namely, non-trivial topology of the Universe which implies the absence of asymptotic states, in contrast to situations one usually deals in ordinar... |
1001.2302 | Carlos A. R. Herdeiro | Miguel Zilhao, Helvi Witek, Ulrich Sperhake, Vitor Cardoso, Leonardo
Gualtieri, Carlos Herdeiro, Andrea Nerozzi | Numerical relativity for D dimensional axially symmetric space-times:
formalism and code tests | 31 pages, 6 figures; v2 Minor changes and added two references.
Matches the published version in PRD. | Phys.Rev.D81:084052,2010 | 10.1103/PhysRevD.81.084052 | null | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The numerical evolution of Einstein's field equations in a generic background
has the potential to answer a variety of important questions in physics: from
applications to the gauge-gravity duality, to modelling black hole production
in TeV gravity scenarios, analysis of the stability of exact solutions and
tests of ... | [
{
"created": "Wed, 13 Jan 2010 21:00:07 GMT",
"version": "v1"
},
{
"created": "Mon, 3 May 2010 15:51:41 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Zilhao",
"Miguel",
""
],
[
"Witek",
"Helvi",
""
],
[
"Sperhake",
"Ulrich",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"Gualtieri",
"Leonardo",
""
],
[
"Herdeiro",
"Carlos",
""
],
[
"Nerozzi",
"Andrea",
""
]
] | The numerical evolution of Einstein's field equations in a generic background has the potential to answer a variety of important questions in physics: from applications to the gauge-gravity duality, to modelling black hole production in TeV gravity scenarios, analysis of the stability of exact solutions and tests of Co... |
1110.2429 | Sean Gryb B | Sean Gryb and Karim Thebault | The role of time in relational quantum theories | 22 pages, 2 figures, section on gravity added, published version
(accepted by Found of Phys) | null | 10.1007/s10701-012-9665-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a solution to the problem of time for systems with a single global
Hamiltonian constraint. Our solution stems from the observation that, for these
theories, conventional gauge theory methods fail to capture the full classical
dynamics of the system and must therefore be deemed inappropriate. We propose a
n... | [
{
"created": "Tue, 11 Oct 2011 16:54:52 GMT",
"version": "v1"
},
{
"created": "Thu, 24 May 2012 11:34:52 GMT",
"version": "v2"
}
] | 2015-05-30 | [
[
"Gryb",
"Sean",
""
],
[
"Thebault",
"Karim",
""
]
] | We propose a solution to the problem of time for systems with a single global Hamiltonian constraint. Our solution stems from the observation that, for these theories, conventional gauge theory methods fail to capture the full classical dynamics of the system and must therefore be deemed inappropriate. We propose a new... |
gr-qc/0309121 | Alexander E. Shalyt-Margolin | A.E.Shalyt-Margolin | Non-Unitary and Unitary Transitions in Generalized Quantum Mechanics and
Information Problem Solving | Latex,12 pages,no figures,some corrections | null | null | null | gr-qc | null | The present work is a study of the unitarity problem for Quantum Mechanics at
Planck Scale considered as Quantum Mechanics with Fundamental Length (QMFL).In
the process QMFL is described as deformation of a well-known Quantum Mechanics
(QM). Similar to previous works of the author, the basic approach is based on
defo... | [
{
"created": "Thu, 25 Sep 2003 12:04:43 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Nov 2003 09:24:02 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Shalyt-Margolin",
"A. E.",
""
]
] | The present work is a study of the unitarity problem for Quantum Mechanics at Planck Scale considered as Quantum Mechanics with Fundamental Length (QMFL).In the process QMFL is described as deformation of a well-known Quantum Mechanics (QM). Similar to previous works of the author, the basic approach is based on deform... |
1302.0573 | J\"org Hennig | Gernot Neugebauer and J\"org Hennig | Stationary black-hole binaries: A non-existence proof | 20 pages, 5 figures. arXiv admin note: text overlap with
arXiv:1105.5830 | General Relativity, Cosmology and Astrophysics - Perspectives 100
years after Einstein's stay in Prague, Fundamental Theories of Physics 177,
209 (Springer, 2014) | 10.1007/978-3-319-06349-2_9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We resume former discussions of the question, whether the spin-spin repulsion
and the gravitational attraction of two aligned black holes can balance each
other. Based on the solution of a boundary problem for disconnected (Killing)
horizons and the resulting violation of characteristic black hole properties,
we pres... | [
{
"created": "Mon, 4 Feb 2013 02:54:24 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Jun 2014 01:26:18 GMT",
"version": "v2"
}
] | 2014-06-24 | [
[
"Neugebauer",
"Gernot",
""
],
[
"Hennig",
"Jörg",
""
]
] | We resume former discussions of the question, whether the spin-spin repulsion and the gravitational attraction of two aligned black holes can balance each other. Based on the solution of a boundary problem for disconnected (Killing) horizons and the resulting violation of characteristic black hole properties, we presen... |
1608.01174 | Ivano Dami\~ao Soares | Ivano Dami\~ao Soares | A boosted Kerr black hole solution and the structure of a general
astrophysical black hole | 11 pages, 1figure | General Relativity and Gravitation (2017) 49:77 | 10.1007/s10714-017-2239-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A solution of Einstein's vacuum field equations that describes a boosted Kerr
black hole relative to an asymptotic Lorentz frame at the future null infinity
is derived. The solution has three parameters (mass, rotation and boost) and
corresponds to the most general configuration that an astrophysical black hole
must ... | [
{
"created": "Wed, 3 Aug 2016 13:05:02 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Nov 2016 17:11:38 GMT",
"version": "v2"
},
{
"created": "Wed, 24 May 2017 18:39:10 GMT",
"version": "v3"
}
] | 2017-05-26 | [
[
"Soares",
"Ivano Damião",
""
]
] | A solution of Einstein's vacuum field equations that describes a boosted Kerr black hole relative to an asymptotic Lorentz frame at the future null infinity is derived. The solution has three parameters (mass, rotation and boost) and corresponds to the most general configuration that an astrophysical black hole must ha... |
2007.04022 | Edward Teo | Edward Teo | Spherical orbits around a Kerr black hole | 40 pages, published version | Gen. Rel. Grav. 53 (2021) 10 | 10.1007/s10714-020-02782-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A special class of orbits known to exist around a Kerr black hole are
spherical orbits -- orbits with constant coordinate radii that are not
necessarily confined to the equatorial plane. Spherical time-like orbits were
first studied by Wilkins almost 50 years ago. In the present paper, we perform
a systematic and tho... | [
{
"created": "Wed, 8 Jul 2020 10:52:56 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jan 2021 08:24:05 GMT",
"version": "v2"
}
] | 2021-01-21 | [
[
"Teo",
"Edward",
""
]
] | A special class of orbits known to exist around a Kerr black hole are spherical orbits -- orbits with constant coordinate radii that are not necessarily confined to the equatorial plane. Spherical time-like orbits were first studied by Wilkins almost 50 years ago. In the present paper, we perform a systematic and thoro... |
0807.2309 | Piotr T. Chru\'sciel | Piotr T. Chru\'sciel, Julien Cortier | Maximal analytic extensions of the Emparan-Reall black ring | minor changes, typos corrected, version identical to the journal one | Journal of Differential Geometry 84 (2010) 19-44 | null | null | gr-qc hep-th math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a Kruskal-Szekeres-type analytic extension of the Emparan-Reall
black ring, and investigate its geometry. We prove that the extension is
maximal, globally hyperbolic, and unique within a natural class of extensions.
The key to those results is the proof that causal geodesics are either
complete, or appro... | [
{
"created": "Tue, 15 Jul 2008 06:40:59 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Dec 2008 12:40:48 GMT",
"version": "v2"
},
{
"created": "Fri, 8 Oct 2010 18:49:31 GMT",
"version": "v3"
}
] | 2013-12-11 | [
[
"Chruściel",
"Piotr T.",
""
],
[
"Cortier",
"Julien",
""
]
] | We construct a Kruskal-Szekeres-type analytic extension of the Emparan-Reall black ring, and investigate its geometry. We prove that the extension is maximal, globally hyperbolic, and unique within a natural class of extensions. The key to those results is the proof that causal geodesics are either complete, or approac... |
1706.02121 | Hamed Pejhan | Kazuharu Bamba, Surena Rahbardehghan and Hamed Pejhan | Vacuum states for gravitons field in de Sitter space | 10 pages, version accepted for publication in Physical Review D | Phys. Rev. D 96, 106009 (2017) | 10.1103/PhysRevD.96.106009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, considering the linearized Einstein equation with a
two-parameter family of linear covariant gauges in de Sitter spacetime, we
examine possible vacuum states for the gravitons field with respect to
invariance under the de Sitter group $SO_0(1,4)$. Our calculations explicitly
reveal that there exists no... | [
{
"created": "Wed, 7 Jun 2017 10:46:20 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Oct 2017 17:48:45 GMT",
"version": "v2"
}
] | 2017-11-22 | [
[
"Bamba",
"Kazuharu",
""
],
[
"Rahbardehghan",
"Surena",
""
],
[
"Pejhan",
"Hamed",
""
]
] | In this paper, considering the linearized Einstein equation with a two-parameter family of linear covariant gauges in de Sitter spacetime, we examine possible vacuum states for the gravitons field with respect to invariance under the de Sitter group $SO_0(1,4)$. Our calculations explicitly reveal that there exists no n... |
gr-qc/9611065 | Ruth A. W. Gregory | Caroline Santos and Ruth Gregory | Cosmology in Brans-Dicke theory with a scalar potential | 28 pages harvmac, 7 figures | Annals Phys. 258 (1997) 111-134 | 10.1006/aphy.1997.5691 | DTP-96-55 | gr-qc astro-ph | null | We consider the general behaviour of cosmologies in Brans-Dicke theory where
the dilaton is self-interacting via a potential $V(\Phi)$. We show that the
general radiation universe is a two-dimensional dynamical system whereas the
dust or false vacuum universe is three-dimensional. This is in contrast to the
non-inter... | [
{
"created": "Wed, 27 Nov 1996 16:29:59 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Santos",
"Caroline",
""
],
[
"Gregory",
"Ruth",
""
]
] | We consider the general behaviour of cosmologies in Brans-Dicke theory where the dilaton is self-interacting via a potential $V(\Phi)$. We show that the general radiation universe is a two-dimensional dynamical system whereas the dust or false vacuum universe is three-dimensional. This is in contrast to the non-interac... |
gr-qc/0702083 | Edward Anderson | Edward Anderson | Classical dynamics on triangleland | Rewritten, publication reference added | Class.Quant.Grav.24:5317-5341,2007 | 10.1088/0264-9381/24/22/001 | null | gr-qc | null | In Euclidean relational particle mechanics (ERPM) only relative times,
relative angles and relative separations are meaningful, while in similarity
relational particle mechanics (SRPM) only relative times, relative angles and
ratios of relative separations are. These theories are clearly of interest in
the absolute o... | [
{
"created": "Thu, 15 Feb 2007 01:14:01 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Apr 2007 16:11:54 GMT",
"version": "v2"
},
{
"created": "Fri, 2 Nov 2007 15:00:45 GMT",
"version": "v3"
}
] | 2009-08-26 | [
[
"Anderson",
"Edward",
""
]
] | In Euclidean relational particle mechanics (ERPM) only relative times, relative angles and relative separations are meaningful, while in similarity relational particle mechanics (SRPM) only relative times, relative angles and ratios of relative separations are. These theories are clearly of interest in the absolute or ... |
gr-qc/0311028 | Naresh Dadhich | Naresh Dadhich | Universalization as a physical guiding principle | RevTeX, 22 pages. This is an essay propounding a new perspective and
it is open for discussion. Comments and criticism will be most welcome. It
will be kept live and would be updated from time to time with proper
acknowledgement to comments and criticism | null | null | null | gr-qc astro-ph hep-th | null | In this essay, I wish to share a novel perspective based on the principle of
universalization in arriving at the relativistic and quantum world from the
classical world. I also delve on some insightful discussion on going
``beyond''.
| [
{
"created": "Sat, 8 Nov 2003 09:16:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dadhich",
"Naresh",
""
]
] | In this essay, I wish to share a novel perspective based on the principle of universalization in arriving at the relativistic and quantum world from the classical world. I also delve on some insightful discussion on going ``beyond''. |
gr-qc/9803061 | Klemm Dietmar | Dietmar Klemm and Luciano Vanzo (University of Trento, Italy) | Quantum Properties of Topological Black Holes | 31 pages, one additional figure, enlarged discussion of the higher
genus case, comment on the mass and new references added | Phys.Rev. D58 (1998) 104025 | 10.1103/PhysRevD.58.104025 | UTF 412 | gr-qc | null | We examine quantum properties of topological black holes which are
asymptotically anti--de Sitter. First, massless scalar fields and Weyl spinors
which propagate in the background of an anti--de Sitter black hole are
considered in an exactly soluble two--dimensional toy model. The Boulware--,
Unruh--, and Hartle--Haw... | [
{
"created": "Tue, 17 Mar 1998 15:54:58 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Mar 1998 15:11:18 GMT",
"version": "v2"
},
{
"created": "Fri, 12 Jun 1998 14:53:19 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Klemm",
"Dietmar",
"",
"University of Trento, Italy"
],
[
"Vanzo",
"Luciano",
"",
"University of Trento, Italy"
]
] | We examine quantum properties of topological black holes which are asymptotically anti--de Sitter. First, massless scalar fields and Weyl spinors which propagate in the background of an anti--de Sitter black hole are considered in an exactly soluble two--dimensional toy model. The Boulware--, Unruh--, and Hartle--Hawki... |
gr-qc/9603005 | Don N. Page | Don N. Page (University of Alberta, Edmonton, Canada) | Stress Tensors for Instantaneous Vacua in 1+1 Dimensions | LaTeX, 28 pages, last term of Eq. (79) corrected | Class.Quant.Grav. 14 (1997) 3041-3061 | 10.1088/0264-9381/14/11/007 | Alberta-Thy-02-96 | gr-qc hep-th | null | The regularized expectation value of the stress-energy tensor for a massless
bosonic or fermionic field in 1+1 dimensions is calculated explicitly for the
instantaneous vacuum relative to any Cauchy surface (here a spacelike curve) in
terms of the length L of the curve (if closed), the local extrinsic curvature K
of ... | [
{
"created": "Tue, 5 Mar 1996 23:10:15 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Jun 1997 22:26:36 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Page",
"Don N.",
"",
"University of Alberta, Edmonton, Canada"
]
] | The regularized expectation value of the stress-energy tensor for a massless bosonic or fermionic field in 1+1 dimensions is calculated explicitly for the instantaneous vacuum relative to any Cauchy surface (here a spacelike curve) in terms of the length L of the curve (if closed), the local extrinsic curvature K of th... |
gr-qc/0005048 | Robert Beig | Robert Beig | Multipole Moments of Static Spacetimes | 9 pages, LaTeX 2.09 | null | null | UWThPh-1999-53 | gr-qc | null | This paper reviews work, largely due to W. Simon and the author, on multipole
theory of static spacetimes. The main purpose is to make this work, which lies
at the interface of potential theory, conformal geometry and general
relativity, known to mathematicians and to perhaps motivate them to look at the
open problem... | [
{
"created": "Sat, 13 May 2000 08:26:07 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Beig",
"Robert",
""
]
] | This paper reviews work, largely due to W. Simon and the author, on multipole theory of static spacetimes. The main purpose is to make this work, which lies at the interface of potential theory, conformal geometry and general relativity, known to mathematicians and to perhaps motivate them to look at the open problems ... |
1604.07764 | Alejandro Corichi | Alejandro Corichi, Irais Rubalcava-Garcia and Tatjana Vukasinac | Actions, topological terms and boundaries in first order gravity: A
review | Review paper. 56 pages, 2 figures | Int. J. Mod. Phys. D25 (2016) no.04, 1630011 | 10.1142/S0218271816300111 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this review we consider first order gravity in four dimensions. In
particular, we focus our attention in formulations where the fundamental
variables are a tetrad $e_a^I$ and a SO(3,1) connection ${\omega_{aI}}^J$. We
study the most general action principle compatible with diffeomorphism
invariance. This implies, ... | [
{
"created": "Tue, 26 Apr 2016 17:36:28 GMT",
"version": "v1"
}
] | 2016-04-27 | [
[
"Corichi",
"Alejandro",
""
],
[
"Rubalcava-Garcia",
"Irais",
""
],
[
"Vukasinac",
"Tatjana",
""
]
] | In this review we consider first order gravity in four dimensions. In particular, we focus our attention in formulations where the fundamental variables are a tetrad $e_a^I$ and a SO(3,1) connection ${\omega_{aI}}^J$. We study the most general action principle compatible with diffeomorphism invariance. This implies, in... |
1302.4035 | Soichiro Isoyama Mr | Soichiro Isoyama, Ryuichi Fujita, Hiroyuki Nakano, Norichika Sago,
Takahiro Tanaka | Evolution of the Carter constant for a resonant inspiral into a Kerr
black hole: I. The scalar case | 18pages, no figures, matches version published in PTEP | Prog. Theor. Exp. Phys. (2013) 063E01 | 10.1093/ptep/ptt034 | YITP-12-102 | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the inspiral of a small body around a Kerr black hole. When the
time scale of the radiation reaction is sufficiently longer than its orbital
period, the leading order orbital evolution is described only by the knowledge
of the averaged evolution of the constants of motion, i.e., the energy,
azimuthal angul... | [
{
"created": "Sun, 17 Feb 2013 06:53:11 GMT",
"version": "v1"
},
{
"created": "Sun, 2 Jun 2013 11:32:57 GMT",
"version": "v2"
}
] | 2013-06-04 | [
[
"Isoyama",
"Soichiro",
""
],
[
"Fujita",
"Ryuichi",
""
],
[
"Nakano",
"Hiroyuki",
""
],
[
"Sago",
"Norichika",
""
],
[
"Tanaka",
"Takahiro",
""
]
] | We discuss the inspiral of a small body around a Kerr black hole. When the time scale of the radiation reaction is sufficiently longer than its orbital period, the leading order orbital evolution is described only by the knowledge of the averaged evolution of the constants of motion, i.e., the energy, azimuthal angular... |
2309.17044 | Pankaj Chaturvedi | Pankaj Chaturvedi, Utkarsh Kumar, Udaykrishna Thattarampilly, and
Vishnu Kakkat | Rotating black hole solutions for $f(R)$ gravity and Newman Janis
Algorithm | 12 pages and one table | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We show that the $f(R)$-gravity theories with constant Ricci scalar in the
Jordan/Einstein frame can be described by Einstein or Einstein-Maxwell gravity
with a cosmological term and a modified gravitational constant. We also propose
a modified Newmann-Janis algorithm to obtain the rotating axisymmetric
solutions for... | [
{
"created": "Fri, 29 Sep 2023 08:11:04 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Oct 2023 04:30:59 GMT",
"version": "v2"
}
] | 2023-10-10 | [
[
"Chaturvedi",
"Pankaj",
""
],
[
"Kumar",
"Utkarsh",
""
],
[
"Thattarampilly",
"Udaykrishna",
""
],
[
"Kakkat",
"Vishnu",
""
]
] | We show that the $f(R)$-gravity theories with constant Ricci scalar in the Jordan/Einstein frame can be described by Einstein or Einstein-Maxwell gravity with a cosmological term and a modified gravitational constant. We also propose a modified Newmann-Janis algorithm to obtain the rotating axisymmetric solutions for t... |
2404.11002 | Yongqiang Wang | Chen-Hao Hao, Xin Su, Yong-Qiang Wang | AdS Ellis wormholes with scalar field | 23 pages, 8 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the spherically symmetric traversable wormholes with
a scalar field supported by a phantom field in the anti-de Sitter (AdS)
asymptotic spacetime. Despite coupling the scalar matter field, these wormholes
remain massless and symmetric for reflection of the radial coordinate $r
\rightarrow -r$.... | [
{
"created": "Wed, 17 Apr 2024 02:24:53 GMT",
"version": "v1"
}
] | 2024-04-18 | [
[
"Hao",
"Chen-Hao",
""
],
[
"Su",
"Xin",
""
],
[
"Wang",
"Yong-Qiang",
""
]
] | In this paper, we study the spherically symmetric traversable wormholes with a scalar field supported by a phantom field in the anti-de Sitter (AdS) asymptotic spacetime. Despite coupling the scalar matter field, these wormholes remain massless and symmetric for reflection of the radial coordinate $r \rightarrow -r$. T... |
1710.00836 | Shahar Hod | Shahar Hod | On the number of light rings in curved spacetimes of ultra-compact
objects | 5 pages | Physics Letters B 776, 1 (2018) | null | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a very interesting paper, Cunha, Berti, and Herdeiro have recently claimed
that ultra-compact objects, self-gravitating horizonless solutions of the
Einstein field equations which have a light ring, must possess at least {\it
two} (and, in general, an even number of) light rings, of which the inner one
is {\it sta... | [
{
"created": "Mon, 2 Oct 2017 18:00:08 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Dec 2017 13:18:46 GMT",
"version": "v2"
}
] | 2017-12-07 | [
[
"Hod",
"Shahar",
""
]
] | In a very interesting paper, Cunha, Berti, and Herdeiro have recently claimed that ultra-compact objects, self-gravitating horizonless solutions of the Einstein field equations which have a light ring, must possess at least {\it two} (and, in general, an even number of) light rings, of which the inner one is {\it stabl... |
gr-qc/9410008 | Sergei V. Sushkov | Sergey Sushkov | Quantum Complex Scalar Field in the Two-Dimensional Spacetime with
Closed Timelike Curves and a Time-Machine Problem | 21(Latex)Postscript file of the figure may be received from author,
CQG-94-1006 | Class.Quant.Grav.12:1685-1698,1995 | 10.1088/0264-9381/12/7/010 | null | gr-qc | null | It is considered the quantum complex scalar field which obeys the
authomorphic condition in the two-dimensional spacetime with closed timelike
curves and the chronology horizon. The renormalized stress-energy tensor is
obtained. It is shown that the value of the stress-energy tensor is regular at
the chronology horiz... | [
{
"created": "Fri, 7 Oct 1994 12:35:24 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Sushkov",
"Sergey",
""
]
] | It is considered the quantum complex scalar field which obeys the authomorphic condition in the two-dimensional spacetime with closed timelike curves and the chronology horizon. The renormalized stress-energy tensor is obtained. It is shown that the value of the stress-energy tensor is regular at the chronology horizon... |
gr-qc/0405107 | Enrique Alvarez | Enrique Alvarez | Quantum Gravity | Lectures given at Karpacz. 40 pages, submitted to Lecture Notes in
Physics. Bigger figures | null | 10.1007/11377306_2 | IFT-UAM/CSIC-04-26 | gr-qc | null | General lectures on quantum gravity.
| [
{
"created": "Wed, 19 May 2004 14:00:37 GMT",
"version": "v1"
},
{
"created": "Fri, 21 May 2004 09:08:24 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Alvarez",
"Enrique",
""
]
] | General lectures on quantum gravity. |
2407.13235 | Pasquale Bosso | Pasquale Bosso | Minimal-length quantum field theory: a first-principle approach | 24 pages, 2 figures, 3 appendices | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Phenomenological models of quantum gravity often consider the existence of
some form of minimal length. This feature is commonly described in the context
of quantum mechanics and using the corresponding formalism and techniques.
Although few attempts at a quantum field-theoretical description of a minimal
length has ... | [
{
"created": "Thu, 18 Jul 2024 07:45:10 GMT",
"version": "v1"
}
] | 2024-07-19 | [
[
"Bosso",
"Pasquale",
""
]
] | Phenomenological models of quantum gravity often consider the existence of some form of minimal length. This feature is commonly described in the context of quantum mechanics and using the corresponding formalism and techniques. Although few attempts at a quantum field-theoretical description of a minimal length has be... |
2403.09756 | Hasan El Moumni | L. Chakhchi, H. El Moumni, K. Masmar | Signatures of the accelerating black holes with a cosmological constant
from the $\textrm{Sgr~A}^\star$ and $\textrm{M87}^\star$ shadow prospects | 37 pages, 10 figures, references updated | Physics of the Dark Universe 44 (2024) 101501 | 10.1016/j.dark.2024.101501 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, the Event Horizon Telescope (EHT) achieved the realization of an
image of the supermassive black hole $\textrm{Sgr~A}^\star$ showing an angular
shadow diameter $\mathcal{D}= 48.7 \pm 7\mu as$ and the fractional deviation
$\mathbf{\delta} =
-0.08^{+0.09}_{-0.09}~\text{(VLTI)},-0.04^{+0.09}_{-0.10}~\text{(Kec... | [
{
"created": "Thu, 14 Mar 2024 14:38:30 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Apr 2024 10:18:31 GMT",
"version": "v2"
}
] | 2024-04-23 | [
[
"Chakhchi",
"L.",
""
],
[
"Moumni",
"H. El",
""
],
[
"Masmar",
"K.",
""
]
] | Recently, the Event Horizon Telescope (EHT) achieved the realization of an image of the supermassive black hole $\textrm{Sgr~A}^\star$ showing an angular shadow diameter $\mathcal{D}= 48.7 \pm 7\mu as$ and the fractional deviation $\mathbf{\delta} = -0.08^{+0.09}_{-0.09}~\text{(VLTI)},-0.04^{+0.09}_{-0.10}~\text{(Keck)... |
1004.3149 | Cosimo Bambi | Cosimo Bambi, Naoki Yoshida | Shape and position of the shadow in the $\delta = 2$ Tomimatsu-Sato
space-time | 9 pages, 3 figures. v3: refereed version | Class.Quant.Grav.27:205006,2010 | 10.1088/0264-9381/27/20/205006 | IPMU10-0061 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within 5-10 years, very long baseline interferometry facilities will be able
to observe the "shadow" of super-massive black hole candidates. This will
allow, for the first time, to test gravity in the strong field regime. In this
paper, we study numerically the photon orbits in the $\delta = 2$
Tomimatsu-Sato space-t... | [
{
"created": "Mon, 19 Apr 2010 10:32:33 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Apr 2010 00:45:36 GMT",
"version": "v2"
},
{
"created": "Fri, 30 Jul 2010 12:40:52 GMT",
"version": "v3"
}
] | 2010-09-09 | [
[
"Bambi",
"Cosimo",
""
],
[
"Yoshida",
"Naoki",
""
]
] | Within 5-10 years, very long baseline interferometry facilities will be able to observe the "shadow" of super-massive black hole candidates. This will allow, for the first time, to test gravity in the strong field regime. In this paper, we study numerically the photon orbits in the $\delta = 2$ Tomimatsu-Sato space-tim... |
1806.00361 | Ping Li | Ping Li, Miao He, Jia-Cheng Ding, Xian-Ru Hu and Jian-Bo Deng | Thermodynamics of charged AdS black holes in rainbow gravity | 16 pages, 6 figures | Advances in High Energy Physics Volume 2018, 6 pages | 10.1155/2018/1043639 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, the thermodynamic property of charged AdS black holes is
studied in rainbow gravity. By the Heisenberg Uncertainty Principle and the
modified dispersion relation, we obtain deformed temperature. Moreover, in
rainbow gravity we calculate the heat capacity in a fixed charge and discuss
the thermal stabil... | [
{
"created": "Thu, 31 May 2018 13:11:31 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Jan 2019 08:54:20 GMT",
"version": "v2"
}
] | 2019-01-04 | [
[
"Li",
"Ping",
""
],
[
"He",
"Miao",
""
],
[
"Ding",
"Jia-Cheng",
""
],
[
"Hu",
"Xian-Ru",
""
],
[
"Deng",
"Jian-Bo",
""
]
] | In this paper, the thermodynamic property of charged AdS black holes is studied in rainbow gravity. By the Heisenberg Uncertainty Principle and the modified dispersion relation, we obtain deformed temperature. Moreover, in rainbow gravity we calculate the heat capacity in a fixed charge and discuss the thermal stabilit... |
1312.7119 | Deepak Vaid | Deepak Vaid | Superconducting and Anti-Ferromagnetic Phases of Spacetime | 6 pages, no figures, shortened for journal submission, comments
welcome :) | null | 10.1155/2017/7935185 | null | gr-qc cond-mat.supr-con | http://creativecommons.org/licenses/by-nc-sa/4.0/ | A correspondence between the $SO(5)$ theory of High-T${}_C$ superconductivity
and antiferromagnetism, put forward by Zhang and collaborators, and a theory of
gravity arising from symmetry breaking of a $SO(5)$ gauge field is presented. A
physical correspondence between the order parameters of the unified SC/AF
theory... | [
{
"created": "Thu, 26 Dec 2013 15:16:14 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Aug 2016 18:40:43 GMT",
"version": "v2"
}
] | 2018-01-03 | [
[
"Vaid",
"Deepak",
""
]
] | A correspondence between the $SO(5)$ theory of High-T${}_C$ superconductivity and antiferromagnetism, put forward by Zhang and collaborators, and a theory of gravity arising from symmetry breaking of a $SO(5)$ gauge field is presented. A physical correspondence between the order parameters of the unified SC/AF theory a... |
gr-qc/9802004 | Maurice van Putten | Maurice H.P.M. van Putten (MIT) | Approximate black holes from a variable cosmological constant | 3 pages,latex,2 figures; corrected typos and existence proof | null | null | null | gr-qc astro-ph | null | The small or zero cosmological constant, $\Lambda$, probably results from a
macroscopic cancellation mechanism of the zero-point energies. However, nearby
horizon surfaces any macroscopic mechanism is expected to result in imperfect
cancellations. A phenomenological description is given for the residual
variable cosm... | [
{
"created": "Mon, 2 Feb 1998 21:36:58 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Apr 1998 00:10:31 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"van Putten",
"Maurice H. P. M.",
"",
"MIT"
]
] | The small or zero cosmological constant, $\Lambda$, probably results from a macroscopic cancellation mechanism of the zero-point energies. However, nearby horizon surfaces any macroscopic mechanism is expected to result in imperfect cancellations. A phenomenological description is given for the residual variable cosmol... |
2404.07186 | Martin Pijnenburg | Martin Pijnenburg, Giulia Cusin, Cyril Pitrou, Jean-Philippe Uzan | Wave optics lensing of gravitational waves: theory and phenomenology of
triple systems in the LISA band | 26 pages, 8 figures | null | null | null | gr-qc astro-ph.CO astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We study lensing of gravitational waves by a black hole in the deep wave
optics regime, i.e. when the wavelength is much larger than the black hole
Schwarzschild radius. We apply it to triple systems, with a binary of stellar
mass objects in the inspiraling phase orbiting around a central massive black
hole. We descr... | [
{
"created": "Wed, 10 Apr 2024 17:40:34 GMT",
"version": "v1"
}
] | 2024-04-11 | [
[
"Pijnenburg",
"Martin",
""
],
[
"Cusin",
"Giulia",
""
],
[
"Pitrou",
"Cyril",
""
],
[
"Uzan",
"Jean-Philippe",
""
]
] | We study lensing of gravitational waves by a black hole in the deep wave optics regime, i.e. when the wavelength is much larger than the black hole Schwarzschild radius. We apply it to triple systems, with a binary of stellar mass objects in the inspiraling phase orbiting around a central massive black hole. We describ... |
gr-qc/0411035 | Amit Ghosh | A. Ghosh and P. Mitra | An improved estimate of black hole entropy in the quantum geometry
approach | 5 pages, LaTeX; references and remarks added | Phys.Lett. B616 (2005) 114-117 | 10.1016/j.physletb.2005.05.003 | null | gr-qc hep-th | null | A proper counting of states for black holes in the quantum geometry approach
shows that the dominant configuration for spins are distributions that include
spins exceeding one-half at the punctures. This raises the value of the Immirzi
parameter and the black hole entropy. However, the coefficient of the
logarithmic ... | [
{
"created": "Mon, 8 Nov 2004 11:00:54 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Nov 2004 10:44:00 GMT",
"version": "v2"
},
{
"created": "Mon, 30 May 2005 09:04:11 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Ghosh",
"A.",
""
],
[
"Mitra",
"P.",
""
]
] | A proper counting of states for black holes in the quantum geometry approach shows that the dominant configuration for spins are distributions that include spins exceeding one-half at the punctures. This raises the value of the Immirzi parameter and the black hole entropy. However, the coefficient of the logarithmic co... |
2103.03476 | Abhik Kumar Sanyal Dr. | Abhik Kumar Sanyal and D. Ray | Scalar meson field in a conformally flat space | 5 pages, 0 figures | Journal of Mathematical Physics 25, 1977 (1984) | 10.1063/1.526389 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Among several authors, who studied massive and massless scalar meson fields
in general relativity, attempts to obtain a complete set of solutions for a
conformally flat metric $e^{\psi}\left({dx^1}^2 + {dx^2}^2 + {dx^3}^2 -
{dx^4}^2\right)$ were made by Ray for massive and massless mesons and Gursay
for massless meso... | [
{
"created": "Fri, 5 Mar 2021 05:18:17 GMT",
"version": "v1"
}
] | 2021-03-08 | [
[
"Sanyal",
"Abhik Kumar",
""
],
[
"Ray",
"D.",
""
]
] | Among several authors, who studied massive and massless scalar meson fields in general relativity, attempts to obtain a complete set of solutions for a conformally flat metric $e^{\psi}\left({dx^1}^2 + {dx^2}^2 + {dx^3}^2 - {dx^4}^2\right)$ were made by Ray for massive and massless mesons and Gursay for massless mesons... |
gr-qc/0512063 | Nadja Magalh\~aes Sim\~ao | Nadja S. Magalhaes | Challenges in Signal Analysis of Resonant-Mass Gravitational Wave
Detectors | 6 pages, 3 figures, presented at the international conference "100
Years of Relativity" (Sao Paulo, Brazil, 22-24 August 2005), to appear in
Brazilian Journal of Physics (Dec. 2005) | Braz.J.Phys. 35 (2005) 1195-1200 | 10.1590/S0103-97332005000700049 | null | gr-qc | null | An overview of the main points related to data analysis in resonant-mass
gravitational wave detectors will be presented. Recent developments on the data
analysis system for the Brazilian detector SCHENBERG will be emphasized.
| [
{
"created": "Sun, 11 Dec 2005 15:03:02 GMT",
"version": "v1"
}
] | 2017-02-01 | [
[
"Magalhaes",
"Nadja S.",
""
]
] | An overview of the main points related to data analysis in resonant-mass gravitational wave detectors will be presented. Recent developments on the data analysis system for the Brazilian detector SCHENBERG will be emphasized. |
2203.01598 | Genly Le\'on | Andronikos Paliathanasis (DUT, Durban and Chile Austral U., Valdivia),
Genly Leon (Catolica del Norte U. and DUT, Durban) | Hyperbolic inflationary model with nonzero curvature | 13 pages. Major revision. One calculation error was amended | null | 10.1016/j.physletb.2022.137407 | null | gr-qc astro-ph.CO hep-ph | http://creativecommons.org/licenses/by/4.0/ | We consider a cosmological model consisting of two scalar fields defined in
the hyperbolic plane known as hyperbolic inflation. For the background space,
we consider a homogeneous and isotropic spacetime with nonzero curvature. We
study the asymptotic behaviour of solutions and we search for attractors in the
expandi... | [
{
"created": "Thu, 3 Mar 2022 09:55:50 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Mar 2022 10:12:54 GMT",
"version": "v2"
},
{
"created": "Fri, 20 May 2022 17:44:21 GMT",
"version": "v3"
}
] | 2022-08-31 | [
[
"Paliathanasis",
"Andronikos",
"",
"DUT, Durban and Chile Austral U., Valdivia"
],
[
"Leon",
"Genly",
"",
"Catolica del Norte U. and DUT, Durban"
]
] | We consider a cosmological model consisting of two scalar fields defined in the hyperbolic plane known as hyperbolic inflation. For the background space, we consider a homogeneous and isotropic spacetime with nonzero curvature. We study the asymptotic behaviour of solutions and we search for attractors in the expanding... |
1106.1693 | David Wiltshire | David L. Wiltshire | What is dust? - Physical foundations of the averaging problem in
cosmology | 39 pages, 3 figures, Invited review accepted by Classical and Quantum
Gravity for the special issue "Inhomogeneous Cosmological Models and
Averaging in Cosmology" | Class.Quant.Grav.28:164006, 2011 | 10.1088/0264-9381/28/16/164006 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The problems of coarse-graining and averaging of inhomogeneous cosmologies,
and their backreaction on average cosmic evolution, are reviewed from a
physical viewpoint. A particular focus is placed on comparing different notions
of average spatial homogeneity, and on the interpretation of observational
results. Among ... | [
{
"created": "Thu, 9 Jun 2011 00:54:55 GMT",
"version": "v1"
}
] | 2011-08-08 | [
[
"Wiltshire",
"David L.",
""
]
] | The problems of coarse-graining and averaging of inhomogeneous cosmologies, and their backreaction on average cosmic evolution, are reviewed from a physical viewpoint. A particular focus is placed on comparing different notions of average spatial homogeneity, and on the interpretation of observational results. Among th... |
1702.05347 | Ira Georg | Ira Georg, Charles Hellaby | Symmetry and Equivalence in Szekeres Models | 16 pages, 3 figures | Phys. Rev. D 95, 124016 (2017) | 10.1103/PhysRevD.95.124016 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We solve for all Szekeres metrics that have a single Killing vector. For
quasi hyperboloidal ($\epsilon = -1$) metrics, we find that translational
symmetries are possible, but only in metrics that have shell crossings
somewhere, while metrics that can be made free of shell crossings only permit
rotations. The quasi p... | [
{
"created": "Fri, 17 Feb 2017 14:07:12 GMT",
"version": "v1"
}
] | 2017-06-14 | [
[
"Georg",
"Ira",
""
],
[
"Hellaby",
"Charles",
""
]
] | We solve for all Szekeres metrics that have a single Killing vector. For quasi hyperboloidal ($\epsilon = -1$) metrics, we find that translational symmetries are possible, but only in metrics that have shell crossings somewhere, while metrics that can be made free of shell crossings only permit rotations. The quasi pla... |
gr-qc/0206071 | Zvi Bern | Zvi Bern | Perturbative Quantum Gravity and its Relation to Gauge Theory | Minor corrections included; 50 pages; to appear in Living Reviews in
Relativity http://www.livingreviews.org | LivingRev.Rel.5:5,2002 | 10.12942/lrr-2002-5 | UCLA/02/TEP/9 | gr-qc hep-ph hep-th | null | In this review we describe a non-trivial relationship between perturbative
gauge theory and gravity scattering amplitudes. At the semi-classical or tree
level, the scattering amplitudes of gravity theories in flat space can be
expressed as a sum of products of well defined pieces of gauge theory
amplitudes. These rel... | [
{
"created": "Tue, 25 Jun 2002 18:05:16 GMT",
"version": "v1"
},
{
"created": "Sat, 20 Jul 2002 21:14:37 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Bern",
"Zvi",
""
]
] | In this review we describe a non-trivial relationship between perturbative gauge theory and gravity scattering amplitudes. At the semi-classical or tree level, the scattering amplitudes of gravity theories in flat space can be expressed as a sum of products of well defined pieces of gauge theory amplitudes. These relat... |
gr-qc/9503027 | Karen Brewster | Lee Smolin | Experimental Signatures of Quantum Gravity | TEX File, Minor Changes Made, 23 pages | null | null | CGPG-95/3-2 | gr-qc astro-ph hep-th | null | I review several different calculations, coming from string theory,
nonperturbative quantum gravity and analyses of black holes that lead to
predictions of phenomena that would uniquely be signatures of quantum
gravitational effects.
These include: 1) deviations from a thermal spectra for evaporating black
holes, 2... | [
{
"created": "Thu, 16 Mar 1995 16:13:28 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jan 1996 21:38:01 GMT",
"version": "v2"
}
] | 2016-08-31 | [
[
"Smolin",
"Lee",
""
]
] | I review several different calculations, coming from string theory, nonperturbative quantum gravity and analyses of black holes that lead to predictions of phenomena that would uniquely be signatures of quantum gravitational effects. These include: 1) deviations from a thermal spectra for evaporating black holes, 2) up... |
1607.00182 | Etera R. Livine | Alexandre Feller, Etera R. Livine | Surface state decoherence in loop quantum gravity, a first toy model | 21 pages | Class.Quant.Grav. 34 (2017) no.4, 045004 | 10.1088/1361-6382/aa525c | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quantum-to-classical transition through decoherence is a major facet of
the semi-classical analysis of quantum models that are supposed to admit a
classical regime, as quantum gravity should be. A particular problem of
interest is the decoherence of black hole horizons and holographic screens
induced by the bulk-... | [
{
"created": "Fri, 1 Jul 2016 09:49:14 GMT",
"version": "v1"
}
] | 2017-04-04 | [
[
"Feller",
"Alexandre",
""
],
[
"Livine",
"Etera R.",
""
]
] | The quantum-to-classical transition through decoherence is a major facet of the semi-classical analysis of quantum models that are supposed to admit a classical regime, as quantum gravity should be. A particular problem of interest is the decoherence of black hole horizons and holographic screens induced by the bulk-bo... |
1010.1444 | Surajit Chattopadhyay | Surajit Chattopadhyay (Pailan College of Management and Technology,
Kolkata), Ujjal Debnath (Bengal Engineering and Science University, Howrah) | Interaction between Tachyon and Hessence (or Hantom) dark energies | null | null | 10.1007/s10773-011-0819-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we have considered that the universe is filled with tachyon,
hessence (or hantom) dark energies. Subsequently we have investigated the
interactions between tachyon and hessence (hantom) dark energies and calculated
the potentials considering the power law form of the scale factor. It has been
revealed ... | [
{
"created": "Thu, 7 Oct 2010 14:39:23 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Chattopadhyay",
"Surajit",
"",
"Pailan College of Management and Technology,\n Kolkata"
],
[
"Debnath",
"Ujjal",
"",
"Bengal Engineering and Science University, Howrah"
]
] | In this paper, we have considered that the universe is filled with tachyon, hessence (or hantom) dark energies. Subsequently we have investigated the interactions between tachyon and hessence (hantom) dark energies and calculated the potentials considering the power law form of the scale factor. It has been revealed th... |
2202.10598 | Vladimir Dergachev Ph.D. | Vladimir Dergachev and Maria Alessandra Papa | A frequency resolved atlas of the sky in continuous gravitational waves | null | null | 10.1103/PhysRevX.13.021020 | null | gr-qc astro-ph.HE astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the first atlas of the continuous gravitational wave sky, produced
using LIGO O3a public data. For each 0.045 Hz frequency band and every point on
the sky the atlas provides gravitational wave amplitude upper limits,
signal-to-noise ratios (SNR) and frequencies where the search measures the
maximum SNR. Th... | [
{
"created": "Tue, 22 Feb 2022 00:40:42 GMT",
"version": "v1"
},
{
"created": "Sat, 15 Apr 2023 04:45:53 GMT",
"version": "v2"
}
] | 2024-01-25 | [
[
"Dergachev",
"Vladimir",
""
],
[
"Papa",
"Maria Alessandra",
""
]
] | We present the first atlas of the continuous gravitational wave sky, produced using LIGO O3a public data. For each 0.045 Hz frequency band and every point on the sky the atlas provides gravitational wave amplitude upper limits, signal-to-noise ratios (SNR) and frequencies where the search measures the maximum SNR. The ... |
1805.00813 | Justin Feng | Justin Feng, Mark Baumann, Bryton Hall, Joel Doss, Lucas Spencer,
Richard Matzner | PoMiN: A Post-Minkowskian $N$-Body Solver | 11 pages w/ 3 figures. Revised to match published version | 2018 ApJ 859 130 | 10.3847/1538-4357/aac209 | UTTG-02-18 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we introduce PoMiN, a lightweight $N$-body code based on the
post-Minkowskian $N$-body Hamiltonian of Ledvinka et. al., which includes
general relativistic effects up to first order in Newton's constant $G$, and
all orders in the speed of light $c$. PoMiN is written in C and uses a
fourth-order Runge-K... | [
{
"created": "Mon, 30 Apr 2018 18:27:53 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Jul 2018 14:55:19 GMT",
"version": "v2"
}
] | 2018-07-25 | [
[
"Feng",
"Justin",
""
],
[
"Baumann",
"Mark",
""
],
[
"Hall",
"Bryton",
""
],
[
"Doss",
"Joel",
""
],
[
"Spencer",
"Lucas",
""
],
[
"Matzner",
"Richard",
""
]
] | In this paper, we introduce PoMiN, a lightweight $N$-body code based on the post-Minkowskian $N$-body Hamiltonian of Ledvinka et. al., which includes general relativistic effects up to first order in Newton's constant $G$, and all orders in the speed of light $c$. PoMiN is written in C and uses a fourth-order Runge-Kut... |
gr-qc/0501080 | Burkhard Zink | Burkhard Zink, Nikolaos Stergioulas, Ian Hawke, Christian D. Ott, Erik
Schnetter and Ewald Mueller | Black hole formation through fragmentation of toroidal polytropes | 4 pages, 3 figures | Phys.Rev.Lett.96:161101,2006 | 10.1103/PhysRevLett.96.161101 | null | gr-qc astro-ph.HE | null | We investigate new paths to black hole formation by considering the general
relativistic evolution of a differentially rotating polytrope with toroidal
shape. We find that this polytrope is unstable to nonaxisymmetric modes, which
leads to a fragmentation into self-gravitating, collapsing components. In the
case of o... | [
{
"created": "Wed, 26 Jan 2005 16:38:31 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Feb 2005 00:37:26 GMT",
"version": "v2"
}
] | 2010-11-16 | [
[
"Zink",
"Burkhard",
""
],
[
"Stergioulas",
"Nikolaos",
""
],
[
"Hawke",
"Ian",
""
],
[
"Ott",
"Christian D.",
""
],
[
"Schnetter",
"Erik",
""
],
[
"Mueller",
"Ewald",
""
]
] | We investigate new paths to black hole formation by considering the general relativistic evolution of a differentially rotating polytrope with toroidal shape. We find that this polytrope is unstable to nonaxisymmetric modes, which leads to a fragmentation into self-gravitating, collapsing components. In the case of one... |
1605.04204 | Andronikos Paliathanasis | Andronikos Paliathanasis and P.G.L. Leach | Analytical solutions in $R+qR^{n}$ cosmology from singularity analysis | 6 pages, discussion improved, to be published in Phys. Lett. A | Phys. Lett. A 380 (2016) 2815-2818 | 10.1016/j.physleta.2016.06.053 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The integrability of higher-order theories of gravity is of importance in the
determining the properties of these models and so their viability as models of
reality. An important tool in the establishment of integrability is the
singularity analysis. We apply this analysis to the case of fourth-order theory
of gravit... | [
{
"created": "Fri, 13 May 2016 15:04:35 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jun 2016 13:44:30 GMT",
"version": "v2"
}
] | 2016-08-04 | [
[
"Paliathanasis",
"Andronikos",
""
],
[
"Leach",
"P. G. L.",
""
]
] | The integrability of higher-order theories of gravity is of importance in the determining the properties of these models and so their viability as models of reality. An important tool in the establishment of integrability is the singularity analysis. We apply this analysis to the case of fourth-order theory of gravity ... |
1308.2159 | Ralf Schutzhold | R. Sch\"utzhold and W. G. Unruh | Hawking radiation with dispersion versus breakdown of WKB | 6 pages | null | 10.1103/PhysRevD.88.124009 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inspired by the condensed matter analogues of black holes (a.k.a. dumb
holes), we study Hawking radiation in the presence of a modified dispersion
relation which becomes super-luminal at large wave-numbers. In the usual
stationary coordinates $(t,x)$, one can describe the asymptotic evolution of
the wave-packets in W... | [
{
"created": "Fri, 9 Aug 2013 15:30:07 GMT",
"version": "v1"
}
] | 2015-06-16 | [
[
"Schützhold",
"R.",
""
],
[
"Unruh",
"W. G.",
""
]
] | Inspired by the condensed matter analogues of black holes (a.k.a. dumb holes), we study Hawking radiation in the presence of a modified dispersion relation which becomes super-luminal at large wave-numbers. In the usual stationary coordinates $(t,x)$, one can describe the asymptotic evolution of the wave-packets in WKB... |
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