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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/0405099 | Mustapha Ishak | Mustapha Ishak (Princeton University) | On perfect fluid models in non-comoving observational spherical
coordinates | 8 pages, 1 figure. To appear in Phys.Rev.D | Phys.Rev. D69 (2004) 124027 | 10.1103/PhysRevD.69.124027 | null | gr-qc astro-ph | null | We use null spherical (observational) coordinates to describe a class of
inhomogeneous cosmological models. The proposed cosmological construction is
based on the observer past null cone. A known difficulty in using inhomogeneous
models is that the null geodesic equation is not integrable in general. Our
choice of nu... | [
{
"created": "Tue, 18 May 2004 17:54:03 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Ishak",
"Mustapha",
"",
"Princeton University"
]
] | We use null spherical (observational) coordinates to describe a class of inhomogeneous cosmological models. The proposed cosmological construction is based on the observer past null cone. A known difficulty in using inhomogeneous models is that the null geodesic equation is not integrable in general. Our choice of null... |
1312.0705 | Hyeong-Chan Kim | Hyeong-Chan Kim | Physics at the surface of a star in Eddington-inspired Born-Infeld
gravity | 7 pages, Comments are added for negative curvatures | Phys. Rev. D 89, 064001 (2014) | 10.1103/PhysRevD.89.064001 | null | gr-qc astro-ph.SR hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study phenomena happening at the surface of a star in Eddington-inspired
Born-Infeld (EiBI) gravity. The star is made of particles, which are
effectively described by a polytropic fluid. The EiBI theory was known to have
a pathology that singularities happen at a star surface. We suggest that the
gravitational bac... | [
{
"created": "Tue, 3 Dec 2013 05:55:02 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Jan 2014 03:00:55 GMT",
"version": "v2"
}
] | 2014-06-17 | [
[
"Kim",
"Hyeong-Chan",
""
]
] | We study phenomena happening at the surface of a star in Eddington-inspired Born-Infeld (EiBI) gravity. The star is made of particles, which are effectively described by a polytropic fluid. The EiBI theory was known to have a pathology that singularities happen at a star surface. We suggest that the gravitational back-... |
2301.13008 | Marco Schreck MS | M. Schreck | New Developments in the Hamiltonian Formulation of the Gravitational
Standard-Model Extension | Presented at the Ninth Meeting on CPT and Lorentz Symmetry,
Bloomington, Indiana, May 17-26, 2022; 4 pages | null | null | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This chapter of the proceedings for the Ninth Meeting on CPT and Lorentz
Symmetry is dedicated to the Hamiltonian formulation of the minimal
gravitational Standard-Model Extension. Some theoretical questions associated
with the latter shall be reviewed. First, we recall the properties of the
Hamiltonian, which was co... | [
{
"created": "Mon, 30 Jan 2023 15:48:07 GMT",
"version": "v1"
}
] | 2023-01-31 | [
[
"Schreck",
"M.",
""
]
] | This chapter of the proceedings for the Ninth Meeting on CPT and Lorentz Symmetry is dedicated to the Hamiltonian formulation of the minimal gravitational Standard-Model Extension. Some theoretical questions associated with the latter shall be reviewed. First, we recall the properties of the Hamiltonian, which was comp... |
2305.14925 | Dnyaneshwar Tadas | S. D. Katore, S. P. Hatkar, D. P. Tadas | Accelerating Kaluza-Klein Universe in Modified Theory of Gravitation | 20 Pages, 08 Figures | Astrophysics 66 98-113 (2023) | 10.1007/s10511-023-09773-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The purpose of this paper is to study the Kaluza-Klein universe in the
context of the $f(R,T)$ gravity theory using magnetized strange quark matter
(MSQM). To obtain exact solutions of field equations, we assume two types of
volumetric expansion: power law and exponential law volumetric expansions. The
violation of e... | [
{
"created": "Wed, 24 May 2023 09:09:44 GMT",
"version": "v1"
}
] | 2023-05-25 | [
[
"Katore",
"S. D.",
""
],
[
"Hatkar",
"S. P.",
""
],
[
"Tadas",
"D. P.",
""
]
] | The purpose of this paper is to study the Kaluza-Klein universe in the context of the $f(R,T)$ gravity theory using magnetized strange quark matter (MSQM). To obtain exact solutions of field equations, we assume two types of volumetric expansion: power law and exponential law volumetric expansions. The violation of ene... |
gr-qc/0307120 | Massimo Bassan | P. Astone, D. Babusci, M. Bassan, P. Carelli, G. Cavallari, E. Coccia,
C. Cosmelli, S. D'Antonio, V. Fafone, A.C. Fauth, G. Federici, G. Giordano,
A. Marini, Y. Minenkov, I. Modena, G. Modestino, A. Moleti, G.V. Pallottino,
G. Pizzella, L. Quintieri, A. Rocchi, F. Ronga, R. Terenzi, G. Torrioli, M.
Visco | Increasing the bandwidth of resonant gravitational antennas: The case of
Explorer | 4 pages- 4 figures Acceted for publication on Physical Review Letters | Phys.Rev.Lett. 91 (2003) 111101 | 10.1103/PhysRevLett.91.111101 | null | gr-qc | null | Resonant gravitational wave detectors with an observation bandwidth of tens
of hertz are a reality: the antenna Explorer, operated at CERN by the ROG
collaboration, has been upgraded with a new read-out. In this new
configuration, it exhibits an unprecedented useful bandwidth: in over 55 Hz
about its frequency of ope... | [
{
"created": "Wed, 30 Jul 2003 17:32:27 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Astone",
"P.",
""
],
[
"Babusci",
"D.",
""
],
[
"Bassan",
"M.",
""
],
[
"Carelli",
"P.",
""
],
[
"Cavallari",
"G.",
""
],
[
"Coccia",
"E.",
""
],
[
"Cosmelli",
"C.",
""
],
[
"D'Antonio",
"S.",
... | Resonant gravitational wave detectors with an observation bandwidth of tens of hertz are a reality: the antenna Explorer, operated at CERN by the ROG collaboration, has been upgraded with a new read-out. In this new configuration, it exhibits an unprecedented useful bandwidth: in over 55 Hz about its frequency of opera... |
2401.02201 | Allan Ranieri Pereira Moreira | A. R. P. Moreira and Shi-Hai Dong | Probabilistic configurations for thick braneworld in modified symmetric
teleparallel gravity | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this research, we delve into the localization patterns of fermionic fields
within a braneworld setting, employing a modified gravity model denoted as
$f(Q)$. Our investigation revolves around two specific models, $f_1(Q)=Q+kQ^n$
and $f_2(Q)=Q+k_1Q^2+k_2Q^3$, where we systematically vary the parameters $n$
and $k_{... | [
{
"created": "Thu, 4 Jan 2024 11:10:55 GMT",
"version": "v1"
}
] | 2024-01-05 | [
[
"Moreira",
"A. R. P.",
""
],
[
"Dong",
"Shi-Hai",
""
]
] | In this research, we delve into the localization patterns of fermionic fields within a braneworld setting, employing a modified gravity model denoted as $f(Q)$. Our investigation revolves around two specific models, $f_1(Q)=Q+kQ^n$ and $f_2(Q)=Q+k_1Q^2+k_2Q^3$, where we systematically vary the parameters $n$ and $k_{1,... |
1101.2980 | Hristu Culetu | Hristu Culetu | Anisotropic fluid inside a relativistic star | 9 pages, refs added, new chapter added, no figures | null | 10.1142/S2010194511000973 | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An anisotropic fluid with variable energy density and negative pressure is
proposed, both outside and inside stars. The gravitational field is constant
everywhere in free space (if we neglect the local contributions) and its value
is of the order of $g = 10^{-8} cm/s^{2}$, in accordance with MOND model. With
$\rho,~ ... | [
{
"created": "Sat, 15 Jan 2011 12:32:13 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Feb 2011 14:14:35 GMT",
"version": "v2"
}
] | 2015-05-27 | [
[
"Culetu",
"Hristu",
""
]
] | An anisotropic fluid with variable energy density and negative pressure is proposed, both outside and inside stars. The gravitational field is constant everywhere in free space (if we neglect the local contributions) and its value is of the order of $g = 10^{-8} cm/s^{2}$, in accordance with MOND model. With $\rho,~ p ... |
0905.2222 | Alexander Zhuk | Maxim Eingorn and Alexander Zhuk | The shape of multidimensional gravity | 4 pages of Revtex4, 2 eps figures | null | null | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the case of one extra dimension, well known Newton's potential $\phi
(r_3)=-G_N m/r_3$ is generalized to compact and elegant formula
$\phi(r_3,\xi)=-(G_N m/r_3)\sinh(2\pi r_3/a)[\cosh(2\pi
r_3/a)-\cos(2\pi\xi/a)]^{-1}$ if four-dimensional space has topology
$\mathbb{R}^3\times T$. Here, $r_3$ is magnitude of three... | [
{
"created": "Wed, 13 May 2009 23:47:06 GMT",
"version": "v1"
}
] | 2009-05-18 | [
[
"Eingorn",
"Maxim",
""
],
[
"Zhuk",
"Alexander",
""
]
] | In the case of one extra dimension, well known Newton's potential $\phi (r_3)=-G_N m/r_3$ is generalized to compact and elegant formula $\phi(r_3,\xi)=-(G_N m/r_3)\sinh(2\pi r_3/a)[\cosh(2\pi r_3/a)-\cos(2\pi\xi/a)]^{-1}$ if four-dimensional space has topology $\mathbb{R}^3\times T$. Here, $r_3$ is magnitude of three-d... |
2011.08351 | Yong-Wan Kim | Soon-Tae Hong, Yong-Wan Kim, Young-Jai Park | GEMS embeddings of Schwarzschild and RN black holes in
Painlev\'e-Gullstrand spacetimes | 18 pages, 3 figures, version to appear in Universe | Universe 2022, 8(1), 15 | 10.3390/universe8010015 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Making use of the higher dimensional global embedding Minkowski spacetime
(GEMS), we embed (3+1)-dimensional Schwarzschild and Reissner-Nordstr\"om (RN)
black holes written by the Painlev\'e-Gullstrand (PG) spacetimes, which have
off-diagonal components in metrics, into (5+1)- and (5+2)-dimensional flat
ones, respect... | [
{
"created": "Tue, 17 Nov 2020 00:36:42 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Dec 2021 09:06:22 GMT",
"version": "v2"
}
] | 2021-12-30 | [
[
"Hong",
"Soon-Tae",
""
],
[
"Kim",
"Yong-Wan",
""
],
[
"Park",
"Young-Jai",
""
]
] | Making use of the higher dimensional global embedding Minkowski spacetime (GEMS), we embed (3+1)-dimensional Schwarzschild and Reissner-Nordstr\"om (RN) black holes written by the Painlev\'e-Gullstrand (PG) spacetimes, which have off-diagonal components in metrics, into (5+1)- and (5+2)-dimensional flat ones, respectiv... |
1907.09118 | Zhan-Feng Mai | Jia-Hui Huang, Wen-Xiang Chen, Zi-Yang Huang, Zhan-Feng Mai | Superradiant stability of the Kerr black holes | null | null | 10.1016/j.physletb.2019.135026 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the superradiant stability of the system of a Kerr black hole and a
massive scalar perturbation. It was proved previously that this system is
superradiantly stable when $\mu\geq \sqrt{2}m\Omega_H$, where $\mu$ is the
proper mass of the scalar, $m$ is the azimuthal number of the scalar mode, and
$\Omega_H$ is... | [
{
"created": "Mon, 22 Jul 2019 03:32:51 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Jul 2019 02:24:28 GMT",
"version": "v2"
},
{
"created": "Tue, 8 Oct 2019 11:37:21 GMT",
"version": "v3"
}
] | 2019-10-16 | [
[
"Huang",
"Jia-Hui",
""
],
[
"Chen",
"Wen-Xiang",
""
],
[
"Huang",
"Zi-Yang",
""
],
[
"Mai",
"Zhan-Feng",
""
]
] | We study the superradiant stability of the system of a Kerr black hole and a massive scalar perturbation. It was proved previously that this system is superradiantly stable when $\mu\geq \sqrt{2}m\Omega_H$, where $\mu$ is the proper mass of the scalar, $m$ is the azimuthal number of the scalar mode, and $\Omega_H$ is t... |
1404.2126 | David Kubiznak | David Kubiznak and Robert B. Mann | Black Hole Chemistry | 12 pages, Essay written for the Gravity Research Foundation 2014
Awards for Essays on Gravitation | null | 10.1139/cjp-2014-0465 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mass of a black hole has traditionally been identified with its energy.
We describe a new perspective on black hole thermodynamics, one that identifies
the mass of a black hole with chemical enthalpy, and the cosmological constant
as thermodynamic pressure. This leads to an understanding of black holes from
the v... | [
{
"created": "Tue, 8 Apr 2014 13:43:59 GMT",
"version": "v1"
}
] | 2023-07-19 | [
[
"Kubiznak",
"David",
""
],
[
"Mann",
"Robert B.",
""
]
] | The mass of a black hole has traditionally been identified with its energy. We describe a new perspective on black hole thermodynamics, one that identifies the mass of a black hole with chemical enthalpy, and the cosmological constant as thermodynamic pressure. This leads to an understanding of black holes from the vie... |
1410.4434 | Tatyana P. Shestakova | T. P. Shestakova | The role of BRST charge as a generator of gauge transformations in
quantization of gauge theories and Gravity | 6 pages, the paper is based on the talks presented at the
International Symposium "Frontiers of Fundamental Physics" (Marseille,
France, 15 - 18 July 2014) and the International Conference "Quantum Field
Theory and Gravity" (Tomsk, Russia, 28 July - 3 August 2014) | Tomsk State Pedagogical University Bulletin 153 (2014) P. 224 -
227 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the Batalin - Fradkin - Vilkovisky approach to quantization of gauge
theories a principal role is given to the BRST charge which can be constructed
as a series in Grassmannian (ghost) variables with coefficients given by
generalized structure functions of constraints algebra. Alternatively, the BRST
charge can be ... | [
{
"created": "Thu, 16 Oct 2014 14:08:52 GMT",
"version": "v1"
}
] | 2015-04-09 | [
[
"Shestakova",
"T. P.",
""
]
] | In the Batalin - Fradkin - Vilkovisky approach to quantization of gauge theories a principal role is given to the BRST charge which can be constructed as a series in Grassmannian (ghost) variables with coefficients given by generalized structure functions of constraints algebra. Alternatively, the BRST charge can be de... |
2111.05856 | Zhen-Ming Xu | Zhen-Ming Xu | Fokker-Planck equation for black holes in thermal potential | 10 pages, published in Phys. Rev. D | Phys. Rev. D 104 (2021) 104022 | 10.1103/PhysRevD.104.104022 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a kind of thermal potential and then put the black hole
thermodynamic system in it. In this regard, some thermodynamic properties of
the black hole are related to the geometric characteristics of the thermal
potential. Driven by the intrinsic thermodynamic fluctuations, the behavior of
the black hole in ... | [
{
"created": "Wed, 10 Nov 2021 10:21:38 GMT",
"version": "v1"
}
] | 2021-11-12 | [
[
"Xu",
"Zhen-Ming",
""
]
] | We construct a kind of thermal potential and then put the black hole thermodynamic system in it. In this regard, some thermodynamic properties of the black hole are related to the geometric characteristics of the thermal potential. Driven by the intrinsic thermodynamic fluctuations, the behavior of the black hole in th... |
2303.00572 | Phongpichit Channuie | Thammarong Eadkhong (Walailak U.), Punsiri Dam-O (Walailak U.),
Phongpichit Channuie (Walailak U.), Davood Momeni (Northern Virginia
Community College) | Nonminimally-coupled warm Higgs inflation: Metric vs. Palatini
Formulations | v2: 18 pages, many figures. version accepted for publication in
Nuclear Physics Section B. arXiv admin note: text overlap with
arXiv:1812.03107, arXiv:2110.03925 by other authors | Nuclear Physics B 994 (2023) 116289 | 10.1016/j.nuclphysb.2023.116289 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this work, we study the non-minimally-coupled Higgs model in the context
of warm inflation scenario on both metric and Palatini approaches. We
particularly consider a dissipation parameter of the form $\Gamma=C_{T}T$ with
$C_{T}$ being a coupling parameter and focus only on the strong regime of the
interaction bet... | [
{
"created": "Wed, 1 Mar 2023 15:16:23 GMT",
"version": "v1"
},
{
"created": "Sat, 8 Jul 2023 04:04:12 GMT",
"version": "v2"
}
] | 2023-07-20 | [
[
"Eadkhong",
"Thammarong",
"",
"Walailak U."
],
[
"Dam-O",
"Punsiri",
"",
"Walailak U."
],
[
"Channuie",
"Phongpichit",
"",
"Walailak U."
],
[
"Momeni",
"Davood",
"",
"Northern Virginia\n Community College"
]
] | In this work, we study the non-minimally-coupled Higgs model in the context of warm inflation scenario on both metric and Palatini approaches. We particularly consider a dissipation parameter of the form $\Gamma=C_{T}T$ with $C_{T}$ being a coupling parameter and focus only on the strong regime of the interaction betwe... |
1312.6741 | Xu Wei | Bin Wu and Wei Xu | New class of rotating perfect fluid black holes in three dimensional
gravity | 12 pages, no figures; a few references added and typos corrected;
published version | Eur. Phys. J. C (2014) 74:3007 | 10.1140/epjc/s10052-014-3007-z | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain a new class of rotating black holes for Einstein theory with
perfect fluid source in (2+1) dimensions. We conclude that these black hole
solutions only depend on variable angular velocity $m(r)$. Some examples of
these black holes are given explicitly. In particular, the unknown static black
hole in this sp... | [
{
"created": "Tue, 24 Dec 2013 02:19:56 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Dec 2013 10:26:34 GMT",
"version": "v2"
},
{
"created": "Mon, 18 Aug 2014 12:52:04 GMT",
"version": "v3"
}
] | 2014-08-19 | [
[
"Wu",
"Bin",
""
],
[
"Xu",
"Wei",
""
]
] | We obtain a new class of rotating black holes for Einstein theory with perfect fluid source in (2+1) dimensions. We conclude that these black hole solutions only depend on variable angular velocity $m(r)$. Some examples of these black holes are given explicitly. In particular, the unknown static black hole in this spec... |
1509.06366 | Shasvath Kapadia | Shasvath J. Kapadia, Nathan K. Johnson-McDaniel, Parameswaran Ajith | Estimating effective higher order terms in the post-Newtonian binding
energy and gravitational-wave flux: Non-spinning compact binary inspiral | 11 pages, 5 figures | Phys. Rev. D 93, 024006 (2016) | 10.1103/PhysRevD.93.024006 | ICTS/2015/8 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the adiabatic post-Newtonian (PN) approximation, the phase evolution of
gravitational waves (GWs) from inspiralling compact binaries in quasicircular
orbits is computed by equating the change in binding energy with the GW flux.
This energy balance equation can be solved in different ways, which result in
multiple ... | [
{
"created": "Mon, 21 Sep 2015 20:02:31 GMT",
"version": "v1"
}
] | 2016-01-13 | [
[
"Kapadia",
"Shasvath J.",
""
],
[
"Johnson-McDaniel",
"Nathan K.",
""
],
[
"Ajith",
"Parameswaran",
""
]
] | In the adiabatic post-Newtonian (PN) approximation, the phase evolution of gravitational waves (GWs) from inspiralling compact binaries in quasicircular orbits is computed by equating the change in binding energy with the GW flux. This energy balance equation can be solved in different ways, which result in multiple ap... |
1301.4483 | Roldao da Rocha | Roldao da Rocha, A. Piloyan, A. M. Kuerten, C. H. Coimbra-Araujo | Casadio-Fabbri-Mazzacurati Black Strings and Braneworld-induced Quasars
Luminosity Corrections | 13 pages, 4 figures (to appear in Class. Quant. Grav.) | Class. Quantum Grav. 30 (2013) 045014 | 10.1088/0264-9381/30/4/045014 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper aims to evince the corrections on the black string warped horizon
in the braneworld paradigm, and their drastic physical consequences, as well as
to provide subsequent applications in astrophysics. Our analysis concerning
black holes on the brane departs from the Schwarzschild case, where the black
string ... | [
{
"created": "Fri, 18 Jan 2013 20:22:34 GMT",
"version": "v1"
}
] | 2013-01-31 | [
[
"da Rocha",
"Roldao",
""
],
[
"Piloyan",
"A.",
""
],
[
"Kuerten",
"A. M.",
""
],
[
"Coimbra-Araujo",
"C. H.",
""
]
] | This paper aims to evince the corrections on the black string warped horizon in the braneworld paradigm, and their drastic physical consequences, as well as to provide subsequent applications in astrophysics. Our analysis concerning black holes on the brane departs from the Schwarzschild case, where the black string is... |
1106.3542 | Laura Mersini-Houghton | Laura Mersini-Houghton | Is Eternal Inflation Eternal? | 7 pages, 2 figs | null | null | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we explore the relationship between the existence of eternal
inflation and the initial conditions leading to inflation. We demonstrate that
past and future completion of inflation is related, in that past-incomplete
inflation can not be future eternal. Bubble universes nucleating close to the
initial co... | [
{
"created": "Fri, 17 Jun 2011 18:15:31 GMT",
"version": "v1"
}
] | 2011-06-20 | [
[
"Mersini-Houghton",
"Laura",
""
]
] | In this paper we explore the relationship between the existence of eternal inflation and the initial conditions leading to inflation. We demonstrate that past and future completion of inflation is related, in that past-incomplete inflation can not be future eternal. Bubble universes nucleating close to the initial cond... |
1704.00038 | Antonios Tsokaros A. | Antonios Tsokaros, Milton Ruiz, Vasileios Paschalidis, Stuart L.
Shapiro, Luca Baiotti, K\=oji Ury\=u | Gravitational wave content and stability of uniformly, rotating,
triaxial neutron stars in general relativity | 12 pages, 5 figures | Phys. Rev. D 95, 124057 (2017) | 10.1103/PhysRevD.95.124057 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Targets for ground-based gravitational wave interferometers include
continuous, quasiperiodic sources of gravitational radiation, such as isolated,
spinning neutron stars. In this work we perform evolution simulations of
uniformly rotating, triaxially deformed stars, the compressible analogues in
general relativity o... | [
{
"created": "Fri, 31 Mar 2017 20:00:03 GMT",
"version": "v1"
}
] | 2017-07-05 | [
[
"Tsokaros",
"Antonios",
""
],
[
"Ruiz",
"Milton",
""
],
[
"Paschalidis",
"Vasileios",
""
],
[
"Shapiro",
"Stuart L.",
""
],
[
"Baiotti",
"Luca",
""
],
[
"Uryū",
"Kōji",
""
]
] | Targets for ground-based gravitational wave interferometers include continuous, quasiperiodic sources of gravitational radiation, such as isolated, spinning neutron stars. In this work we perform evolution simulations of uniformly rotating, triaxially deformed stars, the compressible analogues in general relativity of ... |
0902.3107 | Mariusz Dabrowski P. | Mariusz P. Dabrowski and Tomasz Denkiewicz | Barotropic index w-singularities in cosmology | REVTEX4, 4 pages, 4 figures, version to match a published paper,
title expanded | Phys. Rev. D 79, 063521 (2009) | 10.1103/PhysRevD.79.063521 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find an explicit cosmological model which allows a special type of
cosmological singularity which we call a $w$-singularity. This singularity has
the scale factor finite, the energy density and pressure vanishing, and the
only singular behaviour appears in a time-dependent barotropic index $w(t)$. It
is different ... | [
{
"created": "Wed, 18 Feb 2009 11:46:21 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Feb 2009 11:58:53 GMT",
"version": "v2"
},
{
"created": "Fri, 17 Apr 2009 10:07:23 GMT",
"version": "v3"
}
] | 2009-11-13 | [
[
"Dabrowski",
"Mariusz P.",
""
],
[
"Denkiewicz",
"Tomasz",
""
]
] | We find an explicit cosmological model which allows a special type of cosmological singularity which we call a $w$-singularity. This singularity has the scale factor finite, the energy density and pressure vanishing, and the only singular behaviour appears in a time-dependent barotropic index $w(t)$. It is different fr... |
2305.12345 | Jie Jiang | Jie Jiang and Ming Zhang | Overspinning a rotating black hole in semiclassical gravity with type-A
trace anomaly | 10 pages and 7 figures | null | 10.1140/epjc/s10052-023-11868-2 | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | Recently, Fernandes discovered an analytic solution for rotating black holes
in semiclassical gravity induced by the trace anomaly. These solutions exhibit
some distinctive characteristics, including a non-spherically symmetric event
horizon and violations of the Kerr bound. As a crucial assumption to uphold
causalit... | [
{
"created": "Sun, 21 May 2023 04:43:55 GMT",
"version": "v1"
}
] | 2023-08-16 | [
[
"Jiang",
"Jie",
""
],
[
"Zhang",
"Ming",
""
]
] | Recently, Fernandes discovered an analytic solution for rotating black holes in semiclassical gravity induced by the trace anomaly. These solutions exhibit some distinctive characteristics, including a non-spherically symmetric event horizon and violations of the Kerr bound. As a crucial assumption to uphold causality ... |
2305.06719 | Marko Sossich | Petar Pavlovi\'c and Marko Sossich | Geodesically complete cyclic cosmologies and entropy | 18 pages, 2 figures, the major revision has been done and some
dubious analysis with entropy free models have been omitted, also the article
in this form has been accepted in EPJC | Eur. Phys. J. C 84, 242 (2024) | 10.1140/epjc/s10052-024-12621-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate that there exists a class of cyclic cosmological models, such
that these models can in principle solve the problem of the entropy growth, and
are at the same time geodesically complete. We thus show that some recently
stated conclusions, according to which cyclic cosmologies solving the problem
of entr... | [
{
"created": "Thu, 11 May 2023 10:54:17 GMT",
"version": "v1"
},
{
"created": "Fri, 26 May 2023 09:01:07 GMT",
"version": "v2"
},
{
"created": "Mon, 11 Sep 2023 11:33:34 GMT",
"version": "v3"
},
{
"created": "Thu, 29 Feb 2024 11:45:25 GMT",
"version": "v4"
}
] | 2024-03-12 | [
[
"Pavlović",
"Petar",
""
],
[
"Sossich",
"Marko",
""
]
] | We demonstrate that there exists a class of cyclic cosmological models, such that these models can in principle solve the problem of the entropy growth, and are at the same time geodesically complete. We thus show that some recently stated conclusions, according to which cyclic cosmologies solving the problem of entrop... |
0706.1513 | Cecilia Chirenti | Cecilia B. M. H. Chirenti and Luciano Rezzolla | How to tell a gravastar from a black hole | 16 pages, 13 figures, minor improvement | Class.Quant.Grav.24:4191-4206,2007 | 10.1088/0264-9381/24/16/013 | null | gr-qc astro-ph | null | Gravastars have been recently proposed as potential alternatives to explain
the astrophysical phenomenology traditionally associated to black holes,
raising the question of whether the two objects can be distinguished at all.
Leaving aside the debate about the processes that would lead to the formation
of a gravastar... | [
{
"created": "Mon, 11 Jun 2007 16:35:46 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Jun 2007 17:43:53 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Chirenti",
"Cecilia B. M. H.",
""
],
[
"Rezzolla",
"Luciano",
""
]
] | Gravastars have been recently proposed as potential alternatives to explain the astrophysical phenomenology traditionally associated to black holes, raising the question of whether the two objects can be distinguished at all. Leaving aside the debate about the processes that would lead to the formation of a gravastar a... |
1602.07189 | Hao Wei | Ya-Nan Zhou, De-Zi Liu, Xiao-Bo Zou, Hao Wei | New Generalizations of Cosmography Inspired by the Pade Approximant | 16 pages, 3 tables, 5 figures, revtex4; v2: discussions added, Eur.
Phys. J. C in press; v3: published version | Eur. Phys. J. C76 (2016) 281 | 10.1140/epjc/s10052-016-4091-z | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The current accelerated expansion of the universe has been one of the most
important fields in physics and astronomy since 1998. Many cosmological models
have been proposed in the literature to explain this mysterious phenomenon.
Since the nature and cause of the cosmic acceleration are still unknown,
model-independe... | [
{
"created": "Tue, 23 Feb 2016 15:19:00 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Apr 2016 01:00:00 GMT",
"version": "v2"
},
{
"created": "Mon, 23 May 2016 18:36:00 GMT",
"version": "v3"
}
] | 2016-05-24 | [
[
"Zhou",
"Ya-Nan",
""
],
[
"Liu",
"De-Zi",
""
],
[
"Zou",
"Xiao-Bo",
""
],
[
"Wei",
"Hao",
""
]
] | The current accelerated expansion of the universe has been one of the most important fields in physics and astronomy since 1998. Many cosmological models have been proposed in the literature to explain this mysterious phenomenon. Since the nature and cause of the cosmic acceleration are still unknown, model-independent... |
2202.02205 | Roman Konoplya | R. A. Konoplya and A. Zhidenko | Solutions of the Einstein equations for a black hole surrounded by a
galactic halo | 6 pages, 3 figures, 1 ancillary Mathematica file, the version to
match published in the journal | Astrophys. J. 933 (2022) 166 | 10.3847/1538-4357/ac76bc | null | gr-qc astro-ph.GA hep-th | http://creativecommons.org/licenses/by/4.0/ | Various profiles of matter distribution in galactic halos (such as
Navarro-Frenk-White, Burkert, Hernquist, Moore, Taylor-Silk and others) are
considered here as the source term for the Einstein equations. We solve these
equations and find exact solutions which represent the metric of a central
black hole immersed in... | [
{
"created": "Fri, 4 Feb 2022 15:52:56 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Feb 2022 20:36:53 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Jul 2022 13:54:50 GMT",
"version": "v3"
}
] | 2022-07-13 | [
[
"Konoplya",
"R. A.",
""
],
[
"Zhidenko",
"A.",
""
]
] | Various profiles of matter distribution in galactic halos (such as Navarro-Frenk-White, Burkert, Hernquist, Moore, Taylor-Silk and others) are considered here as the source term for the Einstein equations. We solve these equations and find exact solutions which represent the metric of a central black hole immersed in a... |
1207.3481 | Katanaev | M. O. Katanaev | Point massive particle in General Relativity | 15 pages, references added, 1 figure | Gen. Rel. Grav. 45 (2013) 1861-1875 | 10.1007/s10714-013-1564-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that the Schwarzschild solution describes the gravitational
field outside compact spherically symmetric mass distribution in General
Relativity. In particular, it describes the gravitational field outside a point
particle. Nevertheless, what is the exact solution of Einstein's equations with
$\delta$... | [
{
"created": "Sun, 15 Jul 2012 07:49:42 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Aug 2012 16:43:43 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Dec 2012 12:18:31 GMT",
"version": "v3"
},
{
"created": "Tue, 3 Sep 2013 06:54:56 GMT",
"version": "v4"
}
] | 2013-09-04 | [
[
"Katanaev",
"M. O.",
""
]
] | It is well known that the Schwarzschild solution describes the gravitational field outside compact spherically symmetric mass distribution in General Relativity. In particular, it describes the gravitational field outside a point particle. Nevertheless, what is the exact solution of Einstein's equations with $\delta$-t... |
1509.03298 | Joan Sola | Adria Gomez-Valent, Elahe Karimkhani, and Joan Sola | Background history and cosmic perturbations for a general system of
self-conserved dynamical dark energy and matter | Accepted in JCAP, extended discussion and references added | null | 10.1088/1475-7516/2015/12/048 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We determine the Hubble expansion and the general cosmic perturbations
equations for a general system consisting of self-conserved matter and
self-conserved dark energy (DE). While at the background level the two
components are non-interacting, they do interact at the perturbations level. We
show that the coupled sys... | [
{
"created": "Thu, 10 Sep 2015 19:53:02 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Sep 2015 19:57:27 GMT",
"version": "v2"
},
{
"created": "Sat, 14 Nov 2015 19:34:13 GMT",
"version": "v3"
}
] | 2016-01-13 | [
[
"Gomez-Valent",
"Adria",
""
],
[
"Karimkhani",
"Elahe",
""
],
[
"Sola",
"Joan",
""
]
] | We determine the Hubble expansion and the general cosmic perturbations equations for a general system consisting of self-conserved matter and self-conserved dark energy (DE). While at the background level the two components are non-interacting, they do interact at the perturbations level. We show that the coupled syste... |
gr-qc/9705073 | Misao Sasaki | Yasushi Mino, Misao Sasaki and Takahiro Tanaka | Gravitational Radiation Reaction to a Particle Motion II: Spinning
Particle | 10 pages, revtex | null | null | OU-TAP 46 and KUNS 1419 | gr-qc | null | We discuss the leading order correction to the equation of motion of a
particle with spin on an arbitrary spacetime. A particle traveling in a curved
spacetime is known to trace a geodesic of the background spacetime if the mass
of the particle is negligibly small. For a spinning particle, it is known that
there appe... | [
{
"created": "Tue, 27 May 1997 11:47:05 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mino",
"Yasushi",
""
],
[
"Sasaki",
"Misao",
""
],
[
"Tanaka",
"Takahiro",
""
]
] | We discuss the leading order correction to the equation of motion of a particle with spin on an arbitrary spacetime. A particle traveling in a curved spacetime is known to trace a geodesic of the background spacetime if the mass of the particle is negligibly small. For a spinning particle, it is known that there appear... |
2005.03850 | Michael Good | Michael R.R. Good, Abay Zhakenuly, and Eric V. Linder | The mirror at the edge of the universe: Reflections on an accelerated
boundary correspondence with de Sitter cosmology | 4 pages, 5 figures | Phys. Rev. D 102, 045020 (2020) | 10.1103/PhysRevD.102.045020 | null | gr-qc astro-ph.CO hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An accelerated boundary correspondence (ABC) is solved for the de Sitter
moving mirror cosmology. The beta Bogoliubov coefficients reveal the particle
spectrum is a Planck distribution with temperature inversely proportional to
horizon radius. The quantum stress-tensor indicates a constant emission of
energy flux con... | [
{
"created": "Fri, 8 May 2020 04:34:36 GMT",
"version": "v1"
}
] | 2020-09-01 | [
[
"Good",
"Michael R. R.",
""
],
[
"Zhakenuly",
"Abay",
""
],
[
"Linder",
"Eric V.",
""
]
] | An accelerated boundary correspondence (ABC) is solved for the de Sitter moving mirror cosmology. The beta Bogoliubov coefficients reveal the particle spectrum is a Planck distribution with temperature inversely proportional to horizon radius. The quantum stress-tensor indicates a constant emission of energy flux consi... |
gr-qc/9903056 | The Mammouth | Tamath Rainsford and Peter Szekeres | Post-Newtonian Cosmology | 12 pages, Latex | Gen.Rel.Grav.32:479-490,2000 | 10.1023/A:1001976317159 | The University of Adelaide preprint 9913M79 | gr-qc | null | Newtonian Cosmology is commonly used in astrophysical problems, because of
its obvious simplicity when compared with general relativity. However it has
inherent difficulties, the most obvious of which is the non-existence of a
well-posed initial value problem. In this paper we investigate how far these
problems are m... | [
{
"created": "Mon, 15 Mar 1999 07:32:48 GMT",
"version": "v1"
}
] | 2010-12-03 | [
[
"Rainsford",
"Tamath",
""
],
[
"Szekeres",
"Peter",
""
]
] | Newtonian Cosmology is commonly used in astrophysical problems, because of its obvious simplicity when compared with general relativity. However it has inherent difficulties, the most obvious of which is the non-existence of a well-posed initial value problem. In this paper we investigate how far these problems are met... |
1204.2507 | Slava G. Turyshev | Slava G. Turyshev, Viktor T. Toth, Gary Kinsella, Siu-Chun Lee, Shing
M. Lok, and Jordan Ellis | Support for the thermal origin of the Pioneer anomaly | 5 pages, 4 figures, 3 tables, accepted to Phys. Rev. Letters | Phys. Rev. Lett. 108, 241101 (2012) | 10.1103/PhysRevLett.108.241101 | null | gr-qc astro-ph.IM physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the possibility that the anomalous acceleration of the Pioneer
10 and 11 spacecraft is due to the recoil force associated with an anisotropic
emission of thermal radiation off the vehicles. To this end, relying on the
project and spacecraft design documentation, we constructed a comprehensive
finite-el... | [
{
"created": "Wed, 11 Apr 2012 17:46:02 GMT",
"version": "v1"
}
] | 2012-06-13 | [
[
"Turyshev",
"Slava G.",
""
],
[
"Toth",
"Viktor T.",
""
],
[
"Kinsella",
"Gary",
""
],
[
"Lee",
"Siu-Chun",
""
],
[
"Lok",
"Shing M.",
""
],
[
"Ellis",
"Jordan",
""
]
] | We investigate the possibility that the anomalous acceleration of the Pioneer 10 and 11 spacecraft is due to the recoil force associated with an anisotropic emission of thermal radiation off the vehicles. To this end, relying on the project and spacecraft design documentation, we constructed a comprehensive finite-elem... |
gr-qc/0307071 | Anzhong Wang | Anzhong Wang | Critical Collapse of Cylindrically Symmetric Scalar Field in
Four-Dimensional Einstein's Theory of Gravity | Some typos are corrected. The final version to appear in Phys. Rev. D | Phys.Rev.D68:064006,2003 | 10.1103/PhysRevD.68.064006 | null | gr-qc | null | Four-dimensional cylindrically symmetric spacetimes with homothetic
self-similarity are studied in the context of Einstein's Theory of Gravity, and
a class of exact solutions to the Einstein-massless scalar field equations is
found. Their local and global properties are investigated and found that they
represent grav... | [
{
"created": "Tue, 15 Jul 2003 20:00:53 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Jul 2003 15:22:57 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Sep 2003 22:05:35 GMT",
"version": "v3"
}
] | 2009-07-07 | [
[
"Wang",
"Anzhong",
""
]
] | Four-dimensional cylindrically symmetric spacetimes with homothetic self-similarity are studied in the context of Einstein's Theory of Gravity, and a class of exact solutions to the Einstein-massless scalar field equations is found. Their local and global properties are investigated and found that they represent gravit... |
1205.6637 | Atanu Kumar | Atanu Kumar | Growth of covariant perturbations in the contracting phase of a bouncing
universe | 9 pages, final version | Phys. Rev. D 86, 123522 (2012) | 10.1103/PhysRevD.86.123522 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we examine the validity of the linear perturbation theory near
a bounce in the covariant analysis. Some linearity parameters are defined to
set up conditions for a linear theory. Linear evolution of density perturbation
and gravitational waves have been computed previously. We have calculated the
vector... | [
{
"created": "Wed, 30 May 2012 11:42:43 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Dec 2012 06:21:55 GMT",
"version": "v2"
}
] | 2012-12-21 | [
[
"Kumar",
"Atanu",
""
]
] | In this paper we examine the validity of the linear perturbation theory near a bounce in the covariant analysis. Some linearity parameters are defined to set up conditions for a linear theory. Linear evolution of density perturbation and gravitational waves have been computed previously. We have calculated the vector a... |
gr-qc/0206081 | William A. Hiscock | Shane L. Larson, Ronald W. Hellings, and William A. Hiscock | Unequal arm space-borne gravitational wave detectors | 14 pages, 7 figures, REVTeX 4 | Phys.Rev. D66 (2002) 062001 | 10.1103/PhysRevD.66.062001 | null | gr-qc | null | Unlike ground-based interferometric gravitational wave detectors, large
space-based systems will not be rigid structures. When the end-stations of the
laser interferometer are freely flying spacecraft, the armlengths will change
due to variations in the spacecraft positions along their orbital trajectories,
so the pr... | [
{
"created": "Wed, 26 Jun 2002 23:07:20 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Larson",
"Shane L.",
""
],
[
"Hellings",
"Ronald W.",
""
],
[
"Hiscock",
"William A.",
""
]
] | Unlike ground-based interferometric gravitational wave detectors, large space-based systems will not be rigid structures. When the end-stations of the laser interferometer are freely flying spacecraft, the armlengths will change due to variations in the spacecraft positions along their orbital trajectories, so the prec... |
gr-qc/0411134 | William A. Hiscock | Hector Calderon and William A. Hiscock (Montana State University) | Quantum fields and "Big Rip" expansion singularities | 7 pages; REVTeX 4 | Class.Quant.Grav. 22 (2005) L23-L26 | 10.1088/0264-9381/22/4/L01 | null | gr-qc | null | The effects of quantized conformally invariant massless fields on the
evolution of cosmological models containing a ``Big Rip'' future expansion
singularity are examined. Quantized scalar, spinor, and vector fields are found
to strengthen the accelerating expansion of such models as they approach the
expansion singul... | [
{
"created": "Mon, 29 Nov 2004 00:36:35 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Calderon",
"Hector",
"",
"Montana State University"
],
[
"Hiscock",
"William A.",
"",
"Montana State University"
]
] | The effects of quantized conformally invariant massless fields on the evolution of cosmological models containing a ``Big Rip'' future expansion singularity are examined. Quantized scalar, spinor, and vector fields are found to strengthen the accelerating expansion of such models as they approach the expansion singular... |
gr-qc/0112067 | Ken-ichi Nakao | Ken-ichi Nakao, Kouji Nakamura and Takashi Mishima | Hoop Conjecture and Cosmic Censorship in the Brane-World | 5 pages, 1 figure, to be published in Physics Letters B | Phys.Lett. B564 (2003) 143-148 | 10.1016/S0370-2693(03)00588-4 | OCU-PHYS-183, APGR-2, NAOJ-Th-Ap 2001, No.72 | gr-qc hep-th | null | The initial data of gravity for a cylindrical matter distribution confined on
the brane is studied in the framework of the single brane Randall-Sundrum
scenario. In this scenario, 5-dimensional aspect of gravity appears in the
short range gravitational interaction. We found that the sufficiently thin
configuration of... | [
{
"created": "Wed, 26 Dec 2001 01:45:50 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Apr 2003 07:01:50 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Nakao",
"Ken-ichi",
""
],
[
"Nakamura",
"Kouji",
""
],
[
"Mishima",
"Takashi",
""
]
] | The initial data of gravity for a cylindrical matter distribution confined on the brane is studied in the framework of the single brane Randall-Sundrum scenario. In this scenario, 5-dimensional aspect of gravity appears in the short range gravitational interaction. We found that the sufficiently thin configuration of m... |
gr-qc/9807079 | Thomas Kloesch | M. O. Katanaev (Steklov Math. Inst.), T. Kloesch (Tech. U. Vienna), W.
Kummer (Tech. U. Vienna) | Global properties of warped solutions in General Relativity | 35 pages, 5 eps figures, minor changes | Annals Phys. 276 (1999) 191-222 | 10.1006/aphy.1999.5923 | null | gr-qc | null | Assuming the four-dimensional space-time to be a general warped product of
two surfaces we reduce the four-dimensional Einstein equations to a
two-dimensional problem which can be solved. All global vacuum solutions are
explicitly constructed and analysed. The classification of the solutions
includes the Schwarzschil... | [
{
"created": "Wed, 29 Jul 1998 09:42:20 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Oct 1999 07:03:32 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Katanaev",
"M. O.",
"",
"Steklov Math. Inst."
],
[
"Kloesch",
"T.",
"",
"Tech. U. Vienna"
],
[
"Kummer",
"W.",
"",
"Tech. U. Vienna"
]
] | Assuming the four-dimensional space-time to be a general warped product of two surfaces we reduce the four-dimensional Einstein equations to a two-dimensional problem which can be solved. All global vacuum solutions are explicitly constructed and analysed. The classification of the solutions includes the Schwarzschild,... |
1207.0504 | Richard Brito | Richard Brito, Vitor Cardoso, Paolo Pani | Tidal effects around higher-dimensional black holes | 10 pages, 3 figures, RevTex 4; To be published in Phys.Rev.D; v2:
typos and references corrected | Phys.Rev.D86:024032,2012 | 10.1103/PhysRevD.86.024032 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In four-dimensional spacetime, moons around black holes generate
low-amplitude tides, and the energy extracted from the hole's rotation is
always smaller than the gravitational radiation lost to infinity. Thus, moons
orbiting a black hole inspiral and eventually merge. However, it has been
conjectured that in higher-... | [
{
"created": "Mon, 2 Jul 2012 20:00:07 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jul 2012 12:20:24 GMT",
"version": "v2"
}
] | 2012-07-31 | [
[
"Brito",
"Richard",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"Pani",
"Paolo",
""
]
] | In four-dimensional spacetime, moons around black holes generate low-amplitude tides, and the energy extracted from the hole's rotation is always smaller than the gravitational radiation lost to infinity. Thus, moons orbiting a black hole inspiral and eventually merge. However, it has been conjectured that in higher-di... |
gr-qc/0306048 | M. Meyer | S. Deser | Novel Properties of Massive Higher Spin Fields | 9 pages, 1 figure. Invited talk at "Renormalization Group and
Anomalies in Gravity and Cosmology", Ouro Preto, Brazil, March 17-23, 2003 | Nucl.Phys.Proc.Suppl.127:36-44,2004 | 10.1016/S0920-5632(03)02398-3 | BRX TH-518 | gr-qc hep-th | null | I outline a series of results obtained in collaboration with A. Waldron on
the properties of massive higher (s>1) spin fields in cosmological, constant
curvature, backgrounds and the resulting unexpected qualitative effects on
their degrees of freedom and unitarity properties. The dimensional parameter
$\L$ extends t... | [
{
"created": "Wed, 11 Jun 2003 21:54:20 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Deser",
"S.",
""
]
] | I outline a series of results obtained in collaboration with A. Waldron on the properties of massive higher (s>1) spin fields in cosmological, constant curvature, backgrounds and the resulting unexpected qualitative effects on their degrees of freedom and unitarity properties. The dimensional parameter $\L$ extends the... |
1008.0910 | Hossein Farajollahi | Hossein Farajollahi, Mehrdad Farhoudi, Hossein Shojaie | On Dynamics of Brans--Dicke Theory of Gravitation | 15 pages | Int.J.Theor.Phys.49:2558-2568,2010 | 10.1007/s10773-010-0447-6 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study longstanding problem of cosmological clock in the context of
Brans-Dicke theory of gravitation. We present the Hamiltonian formulation of
the theory for a class of spatially homogenous cosmological models. Then, we
show that formulation of the Brans-Dicke theory in the Einstein frame allows
how an identifica... | [
{
"created": "Thu, 5 Aug 2010 04:10:10 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Jun 2011 07:07:32 GMT",
"version": "v2"
}
] | 2011-06-09 | [
[
"Farajollahi",
"Hossein",
""
],
[
"Farhoudi",
"Mehrdad",
""
],
[
"Shojaie",
"Hossein",
""
]
] | We study longstanding problem of cosmological clock in the context of Brans-Dicke theory of gravitation. We present the Hamiltonian formulation of the theory for a class of spatially homogenous cosmological models. Then, we show that formulation of the Brans-Dicke theory in the Einstein frame allows how an identificati... |
1512.02120 | Andre Landulfo | Jessica Santiago, Andre G. S. Landulfo, William C. C. Lima, George E.
A. Matsas, Raissa F. P. Mendes, Daniel A. T. Vanzella | Instability of nonminimally coupled scalar fields in the spacetime of
thin charged shells | 9 pages, 5 figures. Minor changes to match the published version | Phys. Rev. D 93, 024043 (2016) | 10.1103/PhysRevD.93.024043 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the stability of a free scalar field nonminimally coupled to
gravity under linear perturbations in the spacetime of a charged spherical
shell. Our analysis is performed in the context of quantum field theory in
curved spacetimes. This paper completes previous analyses which considered the
exponential e... | [
{
"created": "Mon, 7 Dec 2015 17:06:29 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Feb 2016 12:35:03 GMT",
"version": "v2"
}
] | 2016-02-24 | [
[
"Santiago",
"Jessica",
""
],
[
"Landulfo",
"Andre G. S.",
""
],
[
"Lima",
"William C. C.",
""
],
[
"Matsas",
"George E. A.",
""
],
[
"Mendes",
"Raissa F. P.",
""
],
[
"Vanzella",
"Daniel A. T.",
""
]
] | We investigate the stability of a free scalar field nonminimally coupled to gravity under linear perturbations in the spacetime of a charged spherical shell. Our analysis is performed in the context of quantum field theory in curved spacetimes. This paper completes previous analyses which considered the exponential enh... |
gr-qc/9305009 | Herbert Balasin | Herbert Balasin, Herbert Nachbagauer | On the Distributional Nature of the Energy Momentum Tensor of a Black
Hole or What Curves the Schwarzschild Geometry ? | 12 pages, latex, TUW-93-12 | Phys. Lett. B315 (1993) 93-97 | 10.1088/0264-9381/10/11/010 | null | gr-qc | null | Using distributional techniques we calculate the energy--momentum tensor of
the Schwarzschild geometry. It turns out to be a well--defined
tensor--distribution concentrated on the $r=0$ region which is usually excluded
from space--time. This provides a physical interpretation for the curvature of
this geometry.
| [
{
"created": "Mon, 10 May 1993 12:43:12 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Balasin",
"Herbert",
""
],
[
"Nachbagauer",
"Herbert",
""
]
] | Using distributional techniques we calculate the energy--momentum tensor of the Schwarzschild geometry. It turns out to be a well--defined tensor--distribution concentrated on the $r=0$ region which is usually excluded from space--time. This provides a physical interpretation for the curvature of this geometry. |
1606.06867 | A. N. Ivanov | A. N. Ivanov, G. Cronenberg, R. H\"ollwieser, T. Jenke, M. Pitschmann,
M. Wellenzohn, H. Abele | Exact Solution for Chameleon Field, Self-Coupled Through the
Ratra-Peebles Potential with n = 1 and Confined Between Two Parallel Plates | 1 figure, 8 pages, the incorrect value rho = 1.188x10^(-8)g/cm^3 is
replaced by the correct one rho =1.188x10^(-10)g/cm^3 | Phys. Rev. D 94, 085005 (2016) | 10.1103/PhysRevD.94.085005 | null | gr-qc astro-ph.CO hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the chameleon field profile, confined between two parallel
plates, filled with air at pressure $P = 10^{-4}\,{\rm mbar}$ and room
temperature and separated by the distance $L$, in the chameleon field theory
with Ratra--Peebles self--interaction potential with index $n = 1$. We give the
exact analytical s... | [
{
"created": "Wed, 22 Jun 2016 09:51:15 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Jul 2016 18:12:46 GMT",
"version": "v2"
},
{
"created": "Sun, 28 Aug 2016 06:17:26 GMT",
"version": "v3"
}
] | 2016-10-12 | [
[
"Ivanov",
"A. N.",
""
],
[
"Cronenberg",
"G.",
""
],
[
"Höllwieser",
"R.",
""
],
[
"Jenke",
"T.",
""
],
[
"Pitschmann",
"M.",
""
],
[
"Wellenzohn",
"M.",
""
],
[
"Abele",
"H.",
""
]
] | We calculate the chameleon field profile, confined between two parallel plates, filled with air at pressure $P = 10^{-4}\,{\rm mbar}$ and room temperature and separated by the distance $L$, in the chameleon field theory with Ratra--Peebles self--interaction potential with index $n = 1$. We give the exact analytical sol... |
1902.11051 | Georgios Lukes-Gerakopoulos | Georgios Lukes-Gerakopoulos, Giovanni Acquaviva and Charalampos
Markakis | Probing Dark Energy through Perfect Fluid Thermodynamics | 10 pages, 1 figure, to appear in the RAGtime20 conference proceedings
(Opava, October 15-19 2018) | Proceedings of RAGtime 20-22, 15-19 Oct., 16-20 Sept., 19-23 Oct.,
2018-2020, Opava, Czech Republic Z. Stuchlik, G. Torook and V. Karas,
editors, Silesian University in Opava, 2020, pp. 375-382 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate that the thermodynamics of a perfect fluid describing baryonic
matter can, in certain limits, lead to an equation of state similar to that of
dark energy. We keep the cosmic fluid equation of state quite general by just
demanding that the speed of sound is positive and less than the speed of light.
In ... | [
{
"created": "Thu, 28 Feb 2019 12:34:55 GMT",
"version": "v1"
}
] | 2021-01-26 | [
[
"Lukes-Gerakopoulos",
"Georgios",
""
],
[
"Acquaviva",
"Giovanni",
""
],
[
"Markakis",
"Charalampos",
""
]
] | We demonstrate that the thermodynamics of a perfect fluid describing baryonic matter can, in certain limits, lead to an equation of state similar to that of dark energy. We keep the cosmic fluid equation of state quite general by just demanding that the speed of sound is positive and less than the speed of light. In th... |
2308.02850 | Roman Konoplya | R. A. Konoplya | Hawking radiation of renormalization group improved regular black holes | 17 pages, 10 captioned figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a renormalization group approach based on the idea that the
primary contribution to the Schwarzschild-like black hole spacetime arises from
the value of the gravitational coupling. The latter depends on the distance
from the origin and approaches its classical value in the far zone. However, at
some stage... | [
{
"created": "Sat, 5 Aug 2023 11:35:35 GMT",
"version": "v1"
}
] | 2023-08-08 | [
[
"Konoplya",
"R. A.",
""
]
] | We consider a renormalization group approach based on the idea that the primary contribution to the Schwarzschild-like black hole spacetime arises from the value of the gravitational coupling. The latter depends on the distance from the origin and approaches its classical value in the far zone. However, at some stage, ... |
2405.09702 | Francisco Lobo | Jos\'e Tarciso S. S. Junior, Francisco S. N. Lobo, Manuel E. Rodrigues | Black bounces in conformal Killing gravity | 13 pages, 12 figures. Accepted for publication in EPJC | Eur. Phys. J. C 84, 557 (2024) | 10.1140/epjc/s10052-024-12922-3 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we analyse black bounce solutions in the recently proposed
``Conformal Killing gravity'' (CKG), by coupling the theory to nonlinear
electrodynamics (NLED) and scalar fields. The original motivation of the theory
was essentially to fulfil specific criteria that are absent in existing
gravitational theori... | [
{
"created": "Wed, 15 May 2024 20:58:28 GMT",
"version": "v1"
}
] | 2024-06-05 | [
[
"Junior",
"José Tarciso S. S.",
""
],
[
"Lobo",
"Francisco S. N.",
""
],
[
"Rodrigues",
"Manuel E.",
""
]
] | In this work, we analyse black bounce solutions in the recently proposed ``Conformal Killing gravity'' (CKG), by coupling the theory to nonlinear electrodynamics (NLED) and scalar fields. The original motivation of the theory was essentially to fulfil specific criteria that are absent in existing gravitational theories... |
1301.3772 | Ulrich Sperhake | Ulrich Sperhake | Numerical relativity in higher dimensions | 24 pages, Rapporteur article for the 13th Marcel Grossmann Meeting,
submitted to IJMPD | null | 10.1142/S021827181330005X | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an overview of recent developments in numerical relativity studies
of higher dimensional spacetimes with a focus on time evolutions of black-hole
systems. After a brief review of the numerical techniques employed for these
studies, we summarize results grouped into the following three areas: (i)
Numerical ... | [
{
"created": "Wed, 16 Jan 2013 18:03:22 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Jan 2013 09:21:13 GMT",
"version": "v2"
}
] | 2015-06-12 | [
[
"Sperhake",
"Ulrich",
""
]
] | We present an overview of recent developments in numerical relativity studies of higher dimensional spacetimes with a focus on time evolutions of black-hole systems. After a brief review of the numerical techniques employed for these studies, we summarize results grouped into the following three areas: (i) Numerical st... |
1311.4255 | Jozef Skakala | Jozef Skakala (IISER-TVM), S. Shankaranarayanan (IISER-TVM) | Horizon spectroscopy in and beyond general relativity | 10 pages, v2: final version accepted for publication in Phys.Rev.D,
(v2 with respect to v1: one reference and two sentences added) | Phys. Rev. D 89, 044019 (2014) | 10.1103/PhysRevD.89.044019 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we generalize the results for the entropy spectra typically
derived for black holes in general relativity to a generic horizon within the
spherically symmetric (asymptotically flat and non-flat) space-times of more
general theories of gravity. We use all the standard --- Bekenstein's universal
lower boun... | [
{
"created": "Mon, 18 Nov 2013 03:38:38 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Dec 2013 07:53:21 GMT",
"version": "v2"
}
] | 2014-02-19 | [
[
"Skakala",
"Jozef",
"",
"IISER-TVM"
],
[
"Shankaranarayanan",
"S.",
"",
"IISER-TVM"
]
] | In this work we generalize the results for the entropy spectra typically derived for black holes in general relativity to a generic horizon within the spherically symmetric (asymptotically flat and non-flat) space-times of more general theories of gravity. We use all the standard --- Bekenstein's universal lower bound ... |
gr-qc/9612004 | Barvinski | A.O. Barvinsky, A.Yu. Kamenshchik and I.V. Mishakov | Quantum origin of the early inflationary Universe | 43 pages, LaTeX, figures not included | Nucl.Phys.B491:387-426,1997 | 10.1016/S0550-3213(97)00118-1 | null | gr-qc | null | We give a detailed presentation of a recently proposed mechanism of
generating the energy scale of inflation by loop effects in quantum cosmology.
We discuss the quantum origin of the early inflationary Universe from the
no-boundary and tunneling quantum states and present a universal effective
action algorithm for t... | [
{
"created": "Mon, 2 Dec 1996 10:09:14 GMT",
"version": "v1"
}
] | 2011-08-17 | [
[
"Barvinsky",
"A. O.",
""
],
[
"Kamenshchik",
"A. Yu.",
""
],
[
"Mishakov",
"I. V.",
""
]
] | We give a detailed presentation of a recently proposed mechanism of generating the energy scale of inflation by loop effects in quantum cosmology. We discuss the quantum origin of the early inflationary Universe from the no-boundary and tunneling quantum states and present a universal effective action algorithm for the... |
gr-qc/0403069 | Hiroyuki Nakano | Hiroyuki Nakano, Hirotaka Takahashi, Hideyuki Tagoshi, Misao Sasaki | An Improved Search Method for Gravitational Ringing of Black Holes | 19 pages, 9 figures | Prog.Theor.Phys.111:781-805,2004 | 10.1143/PTP.111.781 | OCU-PHYS-209, AP-GR-14, OU-TAP-228, YITP-04-14 | gr-qc astro-ph | null | A black hole has characteristic quasi-normal modes that will be excited when
it is formed or when the geometry is perturbed. The state of a black hole when
the quasi-normal modes are excited is called the gravitational ringing, and
detections of it will be a direct confirmation of the existence of black holes.
To det... | [
{
"created": "Tue, 16 Mar 2004 07:06:46 GMT",
"version": "v1"
}
] | 2009-10-09 | [
[
"Nakano",
"Hiroyuki",
""
],
[
"Takahashi",
"Hirotaka",
""
],
[
"Tagoshi",
"Hideyuki",
""
],
[
"Sasaki",
"Misao",
""
]
] | A black hole has characteristic quasi-normal modes that will be excited when it is formed or when the geometry is perturbed. The state of a black hole when the quasi-normal modes are excited is called the gravitational ringing, and detections of it will be a direct confirmation of the existence of black holes. To detec... |
2007.06601 | Laur J\"arv | Jibitesh Dutta, Laur Jarv, Wompherdeiki Khyllep, Sulev Tokke | From inflation to dark energy in scalar-tensor cosmology | 25 pages, 22 plots | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The methods of dynamical systems have found wide applications in cosmology,
with focus either upon inflation or upon the passage into dark energy era. In
this paper, we endeavor to capture the whole history of the universe into a
dynamical system by considering generic scalar tensor gravity with radiation
and dust ma... | [
{
"created": "Mon, 13 Jul 2020 18:06:53 GMT",
"version": "v1"
}
] | 2020-07-15 | [
[
"Dutta",
"Jibitesh",
""
],
[
"Jarv",
"Laur",
""
],
[
"Khyllep",
"Wompherdeiki",
""
],
[
"Tokke",
"Sulev",
""
]
] | The methods of dynamical systems have found wide applications in cosmology, with focus either upon inflation or upon the passage into dark energy era. In this paper, we endeavor to capture the whole history of the universe into a dynamical system by considering generic scalar tensor gravity with radiation and dust matt... |
1407.6992 | Justin Vines | Justin Vines | Geodesic deviation at higher orders via covariant bitensors | 15 pages, 4 figures | null | 10.1007/s10714-015-1901-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review a simple but instructive application of the formalism of covariant
bitensors, to use a deviation vector field along a fiducial geodesic to
describe a neighboring worldline, in an exact and manifestly covariant manner,
via the exponential map. Requiring the neighboring worldline to be a geodesic
leads to the... | [
{
"created": "Fri, 25 Jul 2014 18:06:53 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Vines",
"Justin",
""
]
] | We review a simple but instructive application of the formalism of covariant bitensors, to use a deviation vector field along a fiducial geodesic to describe a neighboring worldline, in an exact and manifestly covariant manner, via the exponential map. Requiring the neighboring worldline to be a geodesic leads to the u... |
1705.03867 | Diego S\'aez-G\'omez | Alvaro de la Cruz-Dombriz (Cape Town U.), Gabriel Farrugia (U. of
Malta), Jackson Levi Said (U. of Malta) and Diego Saez-Chillon Gomez
(Institute of Space Sciences, CSIC/IEEC) | Cosmological reconstructed solutions in extended teleparallel gravity
theories with a teleparallel Gauss-Bonnet term | 40 pages, 3 tables, 2 appendices. For a quick view: see Tables 1,2,3.
Extended analysis and conclusions. Version published in CQG | Class. Quantum Grav. 34, 235011 (2017) | 10.1088/1361-6382/aa93c8 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of extended Teleparallel gravity theories with a 3+1
dimensions Gauss-Bonnet analog term, we address the possibility of these
theories reproducing several well-known cosmological solutions. In particular
when applied to a Friedmann-Lema\^itre-Robertson-Walker geometry in
four-dimensional spacetime with... | [
{
"created": "Wed, 10 May 2017 17:34:37 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Nov 2017 16:40:59 GMT",
"version": "v2"
}
] | 2017-12-06 | [
[
"de la Cruz-Dombriz",
"Alvaro",
"",
"Cape Town U."
],
[
"Farrugia",
"Gabriel",
"",
"U. of\n Malta"
],
[
"Said",
"Jackson Levi",
"",
"U. of Malta"
],
[
"Gomez",
"Diego Saez-Chillon",
"",
"Institute of Space Sciences, CSIC/IEEC"
]
] | In the context of extended Teleparallel gravity theories with a 3+1 dimensions Gauss-Bonnet analog term, we address the possibility of these theories reproducing several well-known cosmological solutions. In particular when applied to a Friedmann-Lema\^itre-Robertson-Walker geometry in four-dimensional spacetime with s... |
2105.00876 | Pardyumn Kumar Sahoo | Raja Solanki, S. K. J. Pacif, Abhishek Parida, P.K. Sahoo | Cosmic acceleration with bulk viscosity in modified $f(Q)$ gravity | Physics of Dark Universe published version | Physics of the Dark Universe, 32, 100820 (2021) | 10.1016/j.dark.2021.100820 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this article, we have investigated the role of bulk viscosity to study the
accelerated expansion of the universe in the framework of modified $f(Q)$
gravity. The gravitational action in this modified gravity theory has the form
$f(Q)$, where $Q$ denote the non-metricity scalar. In the present manuscript,
we have c... | [
{
"created": "Fri, 30 Apr 2021 05:24:01 GMT",
"version": "v1"
}
] | 2022-07-20 | [
[
"Solanki",
"Raja",
""
],
[
"Pacif",
"S. K. J.",
""
],
[
"Parida",
"Abhishek",
""
],
[
"Sahoo",
"P. K.",
""
]
] | In this article, we have investigated the role of bulk viscosity to study the accelerated expansion of the universe in the framework of modified $f(Q)$ gravity. The gravitational action in this modified gravity theory has the form $f(Q)$, where $Q$ denote the non-metricity scalar. In the present manuscript, we have con... |
gr-qc/0506072 | Vladimir Khatsymovsky | V.M. Khatsymovsky | On the area expectation values in area tensor Regge calculus in the
Lorentzian domain | LaTeX, 7 pages, introduction and discussion given in more detail,
references added | Phys.Lett.B633:653-656,2006 | 10.1016/j.physletb.2005.12.033 | null | gr-qc | null | Wick rotation in area tensor Regge calculus is considered. The heuristical
expectation is confirmed that the Lorentzian quantum measure on a spacelike
area should coincide with the Euclidean measure at the same argument. The
consequence is validity of probabilistic interpretation of the Lorentzian
measure as well (on... | [
{
"created": "Sun, 12 Jun 2005 10:12:48 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Dec 2005 12:20:44 GMT",
"version": "v2"
}
] | 2010-11-19 | [
[
"Khatsymovsky",
"V. M.",
""
]
] | Wick rotation in area tensor Regge calculus is considered. The heuristical expectation is confirmed that the Lorentzian quantum measure on a spacelike area should coincide with the Euclidean measure at the same argument. The consequence is validity of probabilistic interpretation of the Lorentzian measure as well (on t... |
gr-qc/9608013 | null | Y.B.Grinkevich ( Omsk State University, Russia ) | Synthetic Differential Geometry: A Way to Intuitionistic Models of
General Relativity in Toposes | 19 pages | null | null | null | gr-qc | null | W.Lawvere suggested a approach to differential geometry and to others
mathematical disciplines closed to physics, which allows to give definitions of
derivatives, tangent vectors and tangent bundles without passages to the
limits. This approach is based on a idea of consideration of all settings not
in sets but in so... | [
{
"created": "Tue, 6 Aug 1996 15:35:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Grinkevich",
"Y. B.",
"",
"Omsk State University, Russia"
]
] | W.Lawvere suggested a approach to differential geometry and to others mathematical disciplines closed to physics, which allows to give definitions of derivatives, tangent vectors and tangent bundles without passages to the limits. This approach is based on a idea of consideration of all settings not in sets but in some... |
2004.14935 | Rittick Roy | Saraswati Devi, Rittick Roy and Sayan Chakrabarti | Quasinormal modes and greybody factors of the novel four dimensional
Gauss-Bonnet black holes in asymptotically de Sitter space time: Scalar,
Electromagnetic and Dirac perturbations | New tables added summarizing primary results, version published in
EPJC | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find the low lying quasinormal mode frequencies of the recently proposed
novel four dimensional Gauss-Bonnet de Sitter black holes for scalar,
electromagnetic and Dirac field perturbations using the third order WKB
approximation as well as Pad\'{e} approximation, as an improvement over WKB. We
figure out the effec... | [
{
"created": "Thu, 30 Apr 2020 16:38:00 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Aug 2020 16:08:29 GMT",
"version": "v2"
}
] | 2020-08-25 | [
[
"Devi",
"Saraswati",
""
],
[
"Roy",
"Rittick",
""
],
[
"Chakrabarti",
"Sayan",
""
]
] | We find the low lying quasinormal mode frequencies of the recently proposed novel four dimensional Gauss-Bonnet de Sitter black holes for scalar, electromagnetic and Dirac field perturbations using the third order WKB approximation as well as Pad\'{e} approximation, as an improvement over WKB. We figure out the effect ... |
gr-qc/9505025 | Serge Droz | C. Barrabes, B. Boisseau and W. Israel | Orbits, forces and accretion dynamics near spinning black holes | 14 pages, latex, no figures | null | 10.1093/mnras/276.2.432 | null | gr-qc astro-ph | null | We analyze the relativistic dynamical properties of Keplerian and
non-Keplerian circular orbits in a general axisymmetric and stationary
gravitational field, and discuss the implications for the stability of co- and
counter-rotating accretion disks and tori surrounding a spinning black hole.
Close to the horizon ther... | [
{
"created": "Tue, 16 May 1995 20:47:28 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Barrabes",
"C.",
""
],
[
"Boisseau",
"B.",
""
],
[
"Israel",
"W.",
""
]
] | We analyze the relativistic dynamical properties of Keplerian and non-Keplerian circular orbits in a general axisymmetric and stationary gravitational field, and discuss the implications for the stability of co- and counter-rotating accretion disks and tori surrounding a spinning black hole. Close to the horizon there ... |
1706.07854 | Dejan Stojkovic | De-Chang Dai, Dejan Stojkovic | A note on a covariant version of Verlinde's emergent gravity | accepted for publication in Phys. Rev. D | Phys. Rev. D 96, 108501 (2017) | 10.1103/PhysRevD.96.108501 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Following recent Verlinde's heuristic construction or emergent gravity,
Hossenfelder wrote down the Lagrangian capturing some aspects of this theory.
We point out that there is an error in calculations whose consequence is that a
cosmological de Sitter space solution is not recovered from this Lagrangian. We
correct ... | [
{
"created": "Fri, 23 Jun 2017 20:37:27 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Oct 2017 19:44:34 GMT",
"version": "v2"
}
] | 2017-11-22 | [
[
"Dai",
"De-Chang",
""
],
[
"Stojkovic",
"Dejan",
""
]
] | Following recent Verlinde's heuristic construction or emergent gravity, Hossenfelder wrote down the Lagrangian capturing some aspects of this theory. We point out that there is an error in calculations whose consequence is that a cosmological de Sitter space solution is not recovered from this Lagrangian. We correct th... |
gr-qc/9405017 | Kenmoku | Masakatsu Kenmoku, Kaori Otsuki and Rieko Sakai | Gravitational Force by Point Particle in Static Einstein Universe | 10 pages, latex, NWU-4/94 | null | null | null | gr-qc | null | The gravitaional force produced by a point particle, like the sun, in the
background of the static Einstein universe is studied. Both the approximate
solution in the weak field limit and exact solution are obtained. The main
properties of the solution are {\it i}) near the point particle, the metric
approaches the Sc... | [
{
"created": "Mon, 9 May 1994 05:09:28 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kenmoku",
"Masakatsu",
""
],
[
"Otsuki",
"Kaori",
""
],
[
"Sakai",
"Rieko",
""
]
] | The gravitaional force produced by a point particle, like the sun, in the background of the static Einstein universe is studied. Both the approximate solution in the weak field limit and exact solution are obtained. The main properties of the solution are {\it i}) near the point particle, the metric approaches the Schw... |
gr-qc/0504102 | Muhammad Sharif | M. Sharif and Sehar Aziz | On Physical Properties of Cylindrically Symmetric Self-Similar Solutions | 16 pages, accepted for publication in Int. J. of Mod. Phys. A | Int.J.Mod.Phys. A20 (2005) 7579-7591 | 10.1142/S0217751X05023906 | null | gr-qc | null | This paper is devoted to discuss some of the features of self-similar
solutions of the first kind. We consider the cylindrically symmetric solutions
with different homotheties. We are interested in evaluating the quantities
acceleration, rotation, expansion, shear, shear invariant and expansion rate.
These kinematica... | [
{
"created": "Thu, 21 Apr 2005 09:27:15 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Sharif",
"M.",
""
],
[
"Aziz",
"Sehar",
""
]
] | This paper is devoted to discuss some of the features of self-similar solutions of the first kind. We consider the cylindrically symmetric solutions with different homotheties. We are interested in evaluating the quantities acceleration, rotation, expansion, shear, shear invariant and expansion rate. These kinematical ... |
2108.07101 | Paul Steinhardt | Anna Ijjas and Paul J. Steinhardt | Entropy, Black holes, and the New Cyclic Universe | v2: minor amendments | null | 10.1016/j.physletb.2021.136823 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We track the evolution of entropy and black holes in a cyclic universe that
undergoes repeated intervals of expansion followed by slow contraction and a
smooth (non-singular) bounce. In this kind of cyclic scenario, there is no big
crunch and no chaotic mixmaster behavior. We explain why the entropy following
each bo... | [
{
"created": "Mon, 16 Aug 2021 14:12:36 GMT",
"version": "v1"
},
{
"created": "Fri, 6 May 2022 14:01:14 GMT",
"version": "v2"
}
] | 2022-05-09 | [
[
"Ijjas",
"Anna",
""
],
[
"Steinhardt",
"Paul J.",
""
]
] | We track the evolution of entropy and black holes in a cyclic universe that undergoes repeated intervals of expansion followed by slow contraction and a smooth (non-singular) bounce. In this kind of cyclic scenario, there is no big crunch and no chaotic mixmaster behavior. We explain why the entropy following each boun... |
1002.2992 | Muhammad Sharif | M. Sharif and M. Jamil Amir | Kinematic Self-Similar Solutions of Locally Rotationally Symmetric
Spacetimes | 17 pages, accepted for publication Brazilian J. Physics | Brazilian J. Physics 40(2010)210-216 | 10.1590/S0103-97332010000200015 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper contains locally rotationally symmetric kinematic self-similar
perfect fluid and dust solutions. We consider three families of metrics which
admit kinematic self-similar vectors of the first, second, zeroth and infinite
kinds, not only for the tilted fluid case but also for the parallel and
orthogonal case... | [
{
"created": "Tue, 16 Feb 2010 02:42:54 GMT",
"version": "v1"
}
] | 2015-05-18 | [
[
"Sharif",
"M.",
""
],
[
"Amir",
"M. Jamil",
""
]
] | This paper contains locally rotationally symmetric kinematic self-similar perfect fluid and dust solutions. We consider three families of metrics which admit kinematic self-similar vectors of the first, second, zeroth and infinite kinds, not only for the tilted fluid case but also for the parallel and orthogonal cases.... |
1906.06654 | P. A. Gonzalez | Ram\'on B\'ecar, P. A. Gonz\'alez, Eleftherios Papantonopoulos and
Yerko V\'asquez | Quasinormal modes of three-dimensional rotating Ho\v{r}ava AdS black
hole and the approach to thermal equilibrium | 17 pages, 14 figures. arXiv admin note: text overlap with
arXiv:hep-th/0112055 by other authors | null | 10.1140/epjc/s10052-020-8169-2 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the quasinormal modes (QNMs) of a massive scalar field in the
background of a rotating three-dimensional Ho\v{r}ava AdS black hole, and we
analyze the effect of the breaking of the Lorentz invariance on the QNMs.
Imposing on the horizon that there are only ingoing waves and at infinity the
Dirichlet bounda... | [
{
"created": "Sun, 16 Jun 2019 06:55:18 GMT",
"version": "v1"
}
] | 2020-08-26 | [
[
"Bécar",
"Ramón",
""
],
[
"González",
"P. A.",
""
],
[
"Papantonopoulos",
"Eleftherios",
""
],
[
"Vásquez",
"Yerko",
""
]
] | We compute the quasinormal modes (QNMs) of a massive scalar field in the background of a rotating three-dimensional Ho\v{r}ava AdS black hole, and we analyze the effect of the breaking of the Lorentz invariance on the QNMs. Imposing on the horizon that there are only ingoing waves and at infinity the Dirichlet boundary... |
1111.0814 | Hristu Culetu | Hristu Culetu | Hyperbolic motion generated by inversion | 4 pages, no figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An inversion transformation applied to an inertial observer is used to
generate a nonstatic conformally flat geometry in spherical coordinates. A
static observer in the new geometry is uniformly accelerating with respect to
the inertial one and vice versa, but its acceleration $g$ undergoes the
transformation $g \rig... | [
{
"created": "Thu, 3 Nov 2011 12:38:47 GMT",
"version": "v1"
}
] | 2011-11-04 | [
[
"Culetu",
"Hristu",
""
]
] | An inversion transformation applied to an inertial observer is used to generate a nonstatic conformally flat geometry in spherical coordinates. A static observer in the new geometry is uniformly accelerating with respect to the inertial one and vice versa, but its acceleration $g$ undergoes the transformation $g \right... |
1710.09205 | Arpita Mitra | Karan Fernandes, Arpita Mitra | Electrovacuum solutions in non-local gravity | 25 pages, 6 figures, new subsection and new references added | Phys. Rev. D 97, 105003 (2018) | 10.1103/PhysRevD.97.105003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the coupling of the electromagnetic field to a non-local gravity
theory comprising of the Einstein-Hilbert action in addition to a non-local
$R\, {\Box}^{-2} R$ term associated with a mass scale $m$. We demonstrate that
in the case of the minimally coupled electromagnetic field, real corrections
about the... | [
{
"created": "Wed, 25 Oct 2017 12:54:26 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jan 2018 17:39:36 GMT",
"version": "v2"
}
] | 2018-05-09 | [
[
"Fernandes",
"Karan",
""
],
[
"Mitra",
"Arpita",
""
]
] | We consider the coupling of the electromagnetic field to a non-local gravity theory comprising of the Einstein-Hilbert action in addition to a non-local $R\, {\Box}^{-2} R$ term associated with a mass scale $m$. We demonstrate that in the case of the minimally coupled electromagnetic field, real corrections about the R... |
2108.01409 | Umananda Dev Goswami | Dhruba Jyoti Gogoi and Umananda Dev Goswami | Cosmology with a new f(R) gravity model in Palatini formalism | 19 pages, 15 figures | IJMP D 31, 2250048 (2022) | 10.1142/S0218271822500481 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the most favourable extensions of General Relativity is the $f(R)$
gravity. $f(R)$ gravity in Palatini formalism can be a realistic alternative to
the dark energy problem. In this work we study a recently introduced dark
energy $f(R)$ gravity model along with two other models in cosmological
perspectives under... | [
{
"created": "Tue, 3 Aug 2021 10:52:59 GMT",
"version": "v1"
},
{
"created": "Thu, 19 May 2022 14:05:43 GMT",
"version": "v2"
}
] | 2022-05-20 | [
[
"Gogoi",
"Dhruba Jyoti",
""
],
[
"Goswami",
"Umananda Dev",
""
]
] | One of the most favourable extensions of General Relativity is the $f(R)$ gravity. $f(R)$ gravity in Palatini formalism can be a realistic alternative to the dark energy problem. In this work we study a recently introduced dark energy $f(R)$ gravity model along with two other models in cosmological perspectives under t... |
1510.07701 | Kimet Jusufi | Kimet Jusufi | Hawking radiation via tunneling from the spacetime of a spinning cosmic
string black holes | null | Gen. Rel. Grav. 47, 124 (2015) | 10.1007/s10714-015-1969-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study Hawking radiation as a massless particles tunneling
process across the event horizon from the Schwarzschild and
Reissner-Nordstr\"om black holes pierced by an infinitely long spinning cosmic
string and a global monopole. Applying the WKB approximation and using a
generalized Painlev\'e line el... | [
{
"created": "Mon, 26 Oct 2015 21:56:25 GMT",
"version": "v1"
}
] | 2015-10-28 | [
[
"Jusufi",
"Kimet",
""
]
] | In this paper, we study Hawking radiation as a massless particles tunneling process across the event horizon from the Schwarzschild and Reissner-Nordstr\"om black holes pierced by an infinitely long spinning cosmic string and a global monopole. Applying the WKB approximation and using a generalized Painlev\'e line elem... |
1806.01772 | Alessandro Nagar | Alessandro Nagar, Sebastiano Bernuzzi, Walter Del Pozzo, Gunnar
Riemenschneider, Sarp Akcay, Gregorio Carullo, Philipp Fleig, Stanislav
Babak, Ka Wa Tsang, Marta Colleoni, Francesco Messina, Geraint Pratten, David
Radice, Piero Rettegno, Michalis Agathos, Edward Fauchon-Jones, Mark Hannam,
Sascha Husa, Tim Diet... | Time-domain effective-one-body gravitational waveforms for coalescing
compact binaries with nonprecessing spins, tides and self-spin effects | 39 pages, 36 figures. Extended appendix with discussion of the
postmerger fits. Version accepted for publication in Phys. Rev. D | Phys. Rev. D 98, 104052 (2018) | 10.1103/PhysRevD.98.104052 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present TEOBResumS, a new effective-one-body (EOB) waveform model for
nonprecessing (spin-aligned) and tidally interacting compact
binaries.Spin-orbit and spin-spin effects are blended together by making use of
the concept of centrifugal EOB radius. The point-mass sector through merger and
ringdown is informed by ... | [
{
"created": "Tue, 5 Jun 2018 16:10:39 GMT",
"version": "v1"
},
{
"created": "Sun, 28 Oct 2018 18:57:38 GMT",
"version": "v2"
}
] | 2018-12-05 | [
[
"Nagar",
"Alessandro",
""
],
[
"Bernuzzi",
"Sebastiano",
""
],
[
"Del Pozzo",
"Walter",
""
],
[
"Riemenschneider",
"Gunnar",
""
],
[
"Akcay",
"Sarp",
""
],
[
"Carullo",
"Gregorio",
""
],
[
"Fleig",
"Philipp",
... | We present TEOBResumS, a new effective-one-body (EOB) waveform model for nonprecessing (spin-aligned) and tidally interacting compact binaries.Spin-orbit and spin-spin effects are blended together by making use of the concept of centrifugal EOB radius. The point-mass sector through merger and ringdown is informed by nu... |
gr-qc/0002086 | Alexei Zakharov | Alexei V. Zakharov | Macroscopic Einstein-Maxwell equations for a system of interacting
particles to second-order accuracy in the interaction constant | 31 pages, LaTeX 2.09 | null | null | KSU-GRG-00-az01 | gr-qc | null | In this paper the macroscopic Einstein and Maxwell equations for system, in
which the electromagnetic interactions are dominating (for instance, the
cosmological plasma before the moment of recombination), are derived. Ensemble
averaging of the microscopic Einstein - Maxwell equations and the iouville
equations for t... | [
{
"created": "Fri, 25 Feb 2000 06:58:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Zakharov",
"Alexei V.",
""
]
] | In this paper the macroscopic Einstein and Maxwell equations for system, in which the electromagnetic interactions are dominating (for instance, the cosmological plasma before the moment of recombination), are derived. Ensemble averaging of the microscopic Einstein - Maxwell equations and the iouville equations for the... |
2306.05282 | Stefano Savastano | Stefano Savastano, Giovanni Tambalo, Hector Villarrubia-Rojo and
Miguel Zumalacarregui | Weakly Lensed Gravitational Waves: Probing Cosmic Structures with
Wave-Optics Features | 26 pages, 12 figures | Phys. Rev. D 108 (2023) 103532 | 10.1103/PhysRevD.108.103532 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Every signal propagating through the universe is at least weakly lensed by
the intervening gravitational field. In some situations, wave-optics phenomena
(diffraction, interference) can be observed as frequency-dependent modulations
of the waveform of gravitational waves (GWs). We will denote these signatures
as Wave... | [
{
"created": "Thu, 8 Jun 2023 15:30:45 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Nov 2023 11:05:32 GMT",
"version": "v2"
}
] | 2023-11-30 | [
[
"Savastano",
"Stefano",
""
],
[
"Tambalo",
"Giovanni",
""
],
[
"Villarrubia-Rojo",
"Hector",
""
],
[
"Zumalacarregui",
"Miguel",
""
]
] | Every signal propagating through the universe is at least weakly lensed by the intervening gravitational field. In some situations, wave-optics phenomena (diffraction, interference) can be observed as frequency-dependent modulations of the waveform of gravitational waves (GWs). We will denote these signatures as Wave-O... |
2103.03121 | Z. Yousaf | Z. Yousaf | Stable Charged Radiating Systems Associated with Tilted Observers | 26 pages, 2 figures | Eur. Phys. J. Plus 136, 281 (2021) | 10.1140/epjp/s13360-021-01278-2 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | This paper is aimed to study the influence of electromagnetic field and
tilted congruences on the dynamical features of self-gravitating system. We
shall explore the stability of homogeneous energy density in the background of
Maxwell-Palatini $f(R)$ gravity. In this respect, we have considered an
irrotational non-st... | [
{
"created": "Wed, 3 Mar 2021 11:57:58 GMT",
"version": "v1"
}
] | 2021-03-05 | [
[
"Yousaf",
"Z.",
""
]
] | This paper is aimed to study the influence of electromagnetic field and tilted congruences on the dynamical features of self-gravitating system. We shall explore the stability of homogeneous energy density in the background of Maxwell-Palatini $f(R)$ gravity. In this respect, we have considered an irrotational non-stat... |
1008.3669 | Puxun Wu | Puxun Wu and Hongwei Yu | $f(T)$ models with phantom divide line crossing | 12 pages, 4 figures, equations corrected | Eur.Phys.J.C71:1552,2011 | 10.1140/epjc/s10052-011-1552-2 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we propose two new models in $f(T)$ gravity to realize the
crossing of the phantom divide line for the effective equation of state, and we
then study the observational constraints on the model parameters. The best fit
results suggest that the observations favor a crossing of the phantom divide
line.
| [
{
"created": "Sat, 21 Aug 2010 23:31:01 GMT",
"version": "v1"
},
{
"created": "Sun, 10 Oct 2010 03:28:19 GMT",
"version": "v2"
},
{
"created": "Sun, 20 Feb 2011 03:39:59 GMT",
"version": "v3"
}
] | 2011-03-03 | [
[
"Wu",
"Puxun",
""
],
[
"Yu",
"Hongwei",
""
]
] | In this paper, we propose two new models in $f(T)$ gravity to realize the crossing of the phantom divide line for the effective equation of state, and we then study the observational constraints on the model parameters. The best fit results suggest that the observations favor a crossing of the phantom divide line. |
1806.07696 | Donato Bini | Donato Bini and Andrea Geralico | Tidal invariants along the world line of an extended body in the Kerr
spacetime | 17 pages, 4 figures; revised version: sign misprints in Eqs.
(4.39)--(4.43) fixed; Eqs. (4.44)--(4.46) corrected | Phys.Rev. D 91, 084012 (2015) | 10.1103/PhysRevD.91.084012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An extended body orbiting a compact object undergoes tidal deformations by
the background gravitational field. Tidal invariants built up with the Riemann
tensor and their derivatives evaluated along the world line of the body are
essential tools to investigate both geometrical and physical properties of the
tidal int... | [
{
"created": "Wed, 20 Jun 2018 12:46:19 GMT",
"version": "v1"
}
] | 2018-06-21 | [
[
"Bini",
"Donato",
""
],
[
"Geralico",
"Andrea",
""
]
] | An extended body orbiting a compact object undergoes tidal deformations by the background gravitational field. Tidal invariants built up with the Riemann tensor and their derivatives evaluated along the world line of the body are essential tools to investigate both geometrical and physical properties of the tidal inter... |
1908.00504 | Ozgur Delice | M. Haluk Se\c{c}uk, \"Ozg\"ur Delice | Superradiance of a Global Monopole in Reissner-Nordstr\"{o}m(-AdS)
Space-time | V3: 19 pages, 3 figures, references added, introduction is extended,
Revtex, Published version | Eur. Phys. J. C (2020) 80: 396 | 10.1140/epjc/s10052-020-7988-5 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, the behaviour of a charged and massive scalar field around a
global monopole swallowed by a Reissner-Nordstr\"{o}m-Anti-de Sitter (RN-AdS)
black hole is investigated by considering the Klein-Gordon equation in this
geometry. The superradiance phenomenon and instability behaviour of the black
hole aga... | [
{
"created": "Thu, 1 Aug 2019 16:56:13 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Jan 2020 17:02:09 GMT",
"version": "v2"
},
{
"created": "Sat, 16 May 2020 22:46:42 GMT",
"version": "v3"
}
] | 2020-05-19 | [
[
"Seçuk",
"M. Haluk",
""
],
[
"Delice",
"Özgür",
""
]
] | In this article, the behaviour of a charged and massive scalar field around a global monopole swallowed by a Reissner-Nordstr\"{o}m-Anti-de Sitter (RN-AdS) black hole is investigated by considering the Klein-Gordon equation in this geometry. The superradiance phenomenon and instability behaviour of the black hole again... |
gr-qc/0005109 | null | Andrzej Krasinski (N. Copernicus Astronomical Center and College of
Science, Polish Academy of Sciences, Warszawa, Poland) | Rotating Bianchi type V dust models generalizing the k = -1 Friedmann
model | 23 pages, LaTeX, no figures, to be submitted for publication.
Subjects: General relativity; exact solutions; cosmology | J.Math.Phys. 42 (2001) 355-367 | 10.1063/1.1330197 | null | gr-qc | null | The Einstein equations for one of the hypersurface-homogeneous rotating dust
models are investigated. It is a Bianchi type V model in which one of the
Killing fields is spanned on velocity and rotation (case 1.2.2.2 in the
classification scheme of the earlier papers). A first integral of the field
equations is found,... | [
{
"created": "Wed, 24 May 2000 15:26:02 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Krasinski",
"Andrzej",
"",
"N. Copernicus Astronomical Center and College of\n Science, Polish Academy of Sciences, Warszawa, Poland"
]
] | The Einstein equations for one of the hypersurface-homogeneous rotating dust models are investigated. It is a Bianchi type V model in which one of the Killing fields is spanned on velocity and rotation (case 1.2.2.2 in the classification scheme of the earlier papers). A first integral of the field equations is found, a... |
1002.1291 | Neil J. Cornish | Matthew R. Adams and Neil J. Cornish | Discriminating between a Stochastic Gravitational Wave Background and
Instrument Noise | 10 Pages, 10 Figures | Phys.Rev.D82:022002,2010 | 10.1103/PhysRevD.82.022002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The detection of a stochastic background of gravitational waves could
significantly impact our understanding of the physical processes that shaped
the early Universe. The challenge lies in separating the cosmological signal
from other stochastic processes such as instrument noise and astrophysical
foregrounds. One ap... | [
{
"created": "Fri, 5 Feb 2010 18:13:44 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Adams",
"Matthew R.",
""
],
[
"Cornish",
"Neil J.",
""
]
] | The detection of a stochastic background of gravitational waves could significantly impact our understanding of the physical processes that shaped the early Universe. The challenge lies in separating the cosmological signal from other stochastic processes such as instrument noise and astrophysical foregrounds. One appr... |
1001.1205 | Pisin Chen | Ronald J. Adler | Six easy roads to the Planck scale | 22 pages and 6 figures | Am.J.Phys.78:925-932,2010 | 10.1119/1.3439650 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give six arguments that the Planck scale should be viewed as a fundamental
minimum or boundary for the classical concept of spacetime, beyond which
quantum effects cannot be neglected and the basic nature of spacetime must be
reconsidered. The arguments are elementary, heuristic, and plausible, and as
much as poss... | [
{
"created": "Fri, 8 Jan 2010 07:07:03 GMT",
"version": "v1"
}
] | 2011-03-28 | [
[
"Adler",
"Ronald J.",
""
]
] | We give six arguments that the Planck scale should be viewed as a fundamental minimum or boundary for the classical concept of spacetime, beyond which quantum effects cannot be neglected and the basic nature of spacetime must be reconsidered. The arguments are elementary, heuristic, and plausible, and as much as possib... |
gr-qc/0606110 | Andrzej Rostworowski | Andrzej Rostworowski | Quasinormal frequencies of D-dimensional Schwarzschild black holes:
evaluation via continued fraction method | 6 pages, no figures, freely available from
http://th-www.if.uj.edu.pl/acta/ | ActaPhys.Polon.B38:81-89,2007 | null | null | gr-qc | null | We adopt Leaver's method to determine quasi normal frequencies of the
Schwarzschild black hole in higher (D >= 10) dimensions. In D-dimensional
Schwarzschild metric, when D increases, more and more singularities, spaced
uniformly on the unit circle |r|=1, approach the horizon at r = r_h = 1. Thus,
a solution satisfyi... | [
{
"created": "Mon, 26 Jun 2006 15:44:41 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Rostworowski",
"Andrzej",
""
]
] | We adopt Leaver's method to determine quasi normal frequencies of the Schwarzschild black hole in higher (D >= 10) dimensions. In D-dimensional Schwarzschild metric, when D increases, more and more singularities, spaced uniformly on the unit circle |r|=1, approach the horizon at r = r_h = 1. Thus, a solution satisfying... |
gr-qc/0005043 | Robert Beig | Robert Beig | Generalized Bowen--York Initial Data | 15 pages, LaTeX, uses Springer cl2emult style | pp.55-69 in Spiros Cotsakis and Gary Gibbons, Eds., "Mathematical
and Quantum Aspects of Relativity and Cosmology", Springer Lecture Notes in
Physics v.537 | null | UWThPh1999-3 | gr-qc | null | A class of vacuum initial-data sets is described which are based on certain
expressions for the extrinsic curvature first studied and employed by Bowen and
York. These expressions play a role for the momentum constraint of general
relativity which is analogous to the role played by the Coulomb solution for
the Gauss-... | [
{
"created": "Fri, 12 May 2000 15:26:25 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Beig",
"Robert",
""
]
] | A class of vacuum initial-data sets is described which are based on certain expressions for the extrinsic curvature first studied and employed by Bowen and York. These expressions play a role for the momentum constraint of general relativity which is analogous to the role played by the Coulomb solution for the Gauss-la... |
1401.0931 | Alok Laddha | Alok Laddha | Hamiltonian constraint in Euclidean LQG revisited: First hints of
off-shell Closure | 68 pages, 6 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We initiate the hunt for a definition of Hamiltonian constraint in Euclidean
Loop Quantum Gravity (LQG) which faithfully represents quantum Dirac algebra.
Borrowing key ideas from previous works on Hamiltonian constraint in LQG and
several toy models, we present some evidence that there exists such a continuum
Hamilt... | [
{
"created": "Sun, 5 Jan 2014 19:27:28 GMT",
"version": "v1"
}
] | 2014-01-07 | [
[
"Laddha",
"Alok",
""
]
] | We initiate the hunt for a definition of Hamiltonian constraint in Euclidean Loop Quantum Gravity (LQG) which faithfully represents quantum Dirac algebra. Borrowing key ideas from previous works on Hamiltonian constraint in LQG and several toy models, we present some evidence that there exists such a continuum Hamilton... |
2212.08784 | Yu-Xiao Liu | Wen-Di Guo, Qin Tan, and Yu-Xiao Liu | Gravitoelectromagnetic coupled perturbations and quasinormal modes of a
charged black hole with scalar hair | 10 pages, 3 figures, 2 tables, some mistakes have been corrected | Phys. Rev. D 107 (2023) 12, 124046 | 10.1103/PhysRevD.107.124046 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | From the quantum point of view, singularity should not exist. Recently, Bah
and Heidmann constructed a five-dimensional singularity free topology
star/black hole [Phys. Rev. Lett. 126, 151101 (2021)]. By integrating the extra
dimension, a four-dimensional static spherical black hole with a magnetic
charge and scalar ... | [
{
"created": "Sat, 17 Dec 2022 02:52:32 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Dec 2022 12:12:30 GMT",
"version": "v2"
},
{
"created": "Sun, 1 Jan 2023 13:57:25 GMT",
"version": "v3"
},
{
"created": "Thu, 22 Feb 2024 03:46:33 GMT",
"version": "v4"
}
] | 2024-02-23 | [
[
"Guo",
"Wen-Di",
""
],
[
"Tan",
"Qin",
""
],
[
"Liu",
"Yu-Xiao",
""
]
] | From the quantum point of view, singularity should not exist. Recently, Bah and Heidmann constructed a five-dimensional singularity free topology star/black hole [Phys. Rev. Lett. 126, 151101 (2021)]. By integrating the extra dimension, a four-dimensional static spherical black hole with a magnetic charge and scalar ha... |
2209.07226 | Hugo L\'evy | Hugo L\'evy, Jo\"el Berg\'e and Jean-Philippe Uzan | Solving nonlinear Klein-Gordon equations on unbounded domains via the
Finite Element Method | 35 pages, 20 figures, 2 tables. Accepted for publication in PRD | null | 10.1103/PhysRevD.106.124021 | null | gr-qc astro-ph.IM cs.NA math.NA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A large class of scalar-tensor theories of gravity exhibit a screening
mechanism that dynamically suppresses fifth forces in the Solar system and
local laboratory experiments. Technically, at the scalar field equation level,
this usually translates into nonlinearities which strongly limit the scope of
analytical appr... | [
{
"created": "Thu, 15 Sep 2022 11:40:37 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Sep 2022 08:04:47 GMT",
"version": "v2"
},
{
"created": "Tue, 20 Dec 2022 12:39:41 GMT",
"version": "v3"
}
] | 2022-12-21 | [
[
"Lévy",
"Hugo",
""
],
[
"Bergé",
"Joël",
""
],
[
"Uzan",
"Jean-Philippe",
""
]
] | A large class of scalar-tensor theories of gravity exhibit a screening mechanism that dynamically suppresses fifth forces in the Solar system and local laboratory experiments. Technically, at the scalar field equation level, this usually translates into nonlinearities which strongly limit the scope of analytical approa... |
1904.02915 | Lunchakorn Tannukij | Sirachak Panpanich, Supakchai Ponglertsakul, Lunchakorn Tannukij | Particle motions and Gravitational Lensing in de Rham-Gabadadze-Tolley
Massive Gravity Theory | 12 pages, 2 tables, 9 figures, matched with the PRD version | Phys. Rev. D 100, 044031 (2019) | 10.1103/PhysRevD.100.044031 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate gravitational lensing and particle motions around
non-asymptotically flat black hole spacetime in non-linear, ghost-free massive
gravity theory, called de Rham-Gabadadze-Tolley (dRGT) massive gravity.
Deflection angle formulae are derived in terms of perihelion parameter. The
deflection angle can be po... | [
{
"created": "Fri, 5 Apr 2019 07:48:44 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Aug 2019 09:05:31 GMT",
"version": "v2"
}
] | 2019-08-23 | [
[
"Panpanich",
"Sirachak",
""
],
[
"Ponglertsakul",
"Supakchai",
""
],
[
"Tannukij",
"Lunchakorn",
""
]
] | We investigate gravitational lensing and particle motions around non-asymptotically flat black hole spacetime in non-linear, ghost-free massive gravity theory, called de Rham-Gabadadze-Tolley (dRGT) massive gravity. Deflection angle formulae are derived in terms of perihelion parameter. The deflection angle can be posi... |
1212.2195 | Jay Tasson | Jay D. Tasson | Lorentz Symmetry, the SME, and Gravitational Experiments | 9 pages, presented at the XLVIth Rencontres de Moriond and GPhyS
Colloquium, La Thuile, Aosta Valley, Italy, March 2011 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This proceedings contribution summarizes the implications of recent SME-based
investigations of Lorentz violation for gravitational experiments.
| [
{
"created": "Mon, 10 Dec 2012 20:43:43 GMT",
"version": "v1"
}
] | 2012-12-11 | [
[
"Tasson",
"Jay D.",
""
]
] | This proceedings contribution summarizes the implications of recent SME-based investigations of Lorentz violation for gravitational experiments. |
2407.09663 | Vicente Antunes | Mario Novello and Vicente Antunes | Rotation in the Geometric Scalar Theory of Gravity | null | null | null | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | We present solutions corresponding to rotational configurations in the
recently proposed Geometric Scalar Gravity (GSG) theory. The solutions obtained
here have the important property that the associated closed time-like curves
are always restricted to a compact domain of space-time. We compare this
property with tho... | [
{
"created": "Fri, 12 Jul 2024 19:56:56 GMT",
"version": "v1"
}
] | 2024-07-16 | [
[
"Novello",
"Mario",
""
],
[
"Antunes",
"Vicente",
""
]
] | We present solutions corresponding to rotational configurations in the recently proposed Geometric Scalar Gravity (GSG) theory. The solutions obtained here have the important property that the associated closed time-like curves are always restricted to a compact domain of space-time. We compare this property with those... |
1912.03701 | John Westernacher-Schneider | John Ryan Westernacher-Schneider, Charalampos Markakis, Bing Jyun Tsao | Hamilton-Jacobi hydrodynamics of pulsating relativistic stars | 24 pgs, 3 figs. Typo fixed. v3: published version.
https://doi.org/10.1088/1361-6382/ab93e9 | null | 10.1088/1361-6382/ab93e9 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dynamics of self-gravitating fluid bodies is described by the
Euler-Einstein system of partial differential equations. The break-down of
well-posedness on the fluid-vacuum interface remains a challenging open
problem, which is manifested in simulations of oscillating or inspiraling
binary neutron-stars. We formul... | [
{
"created": "Sun, 8 Dec 2019 15:38:01 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Dec 2019 17:50:49 GMT",
"version": "v2"
},
{
"created": "Thu, 16 Jul 2020 16:55:04 GMT",
"version": "v3"
}
] | 2020-07-17 | [
[
"Westernacher-Schneider",
"John Ryan",
""
],
[
"Markakis",
"Charalampos",
""
],
[
"Tsao",
"Bing Jyun",
""
]
] | The dynamics of self-gravitating fluid bodies is described by the Euler-Einstein system of partial differential equations. The break-down of well-posedness on the fluid-vacuum interface remains a challenging open problem, which is manifested in simulations of oscillating or inspiraling binary neutron-stars. We formulat... |
1001.1068 | Matteo Luca Ruggiero | Angelo Tartaglia, Matteo Luca Ruggiero, Emiliano Capolongo | A null frame for spacetime positioning by means of pulsating sources | 19 pages, revised to match the version accepted for publication in
Advances in Space Research | Adv.Space Res.47:645-653,2011 | 10.1016/j.asr.2010.10.023 | null | gr-qc astro-ph.IM physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce an operational approach to the use of pulsating sources, located
at spatial infinity, for defining a relativistic positioning and navigation
system, based on the use of four-dimensional bases of null four-vectors, in
flat spacetime. As a prototypical case, we show how pulsars can be used to
define such a... | [
{
"created": "Thu, 7 Jan 2010 13:25:36 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Jun 2010 11:16:12 GMT",
"version": "v2"
},
{
"created": "Sat, 30 Oct 2010 11:17:53 GMT",
"version": "v3"
}
] | 2011-03-04 | [
[
"Tartaglia",
"Angelo",
""
],
[
"Ruggiero",
"Matteo Luca",
""
],
[
"Capolongo",
"Emiliano",
""
]
] | We introduce an operational approach to the use of pulsating sources, located at spatial infinity, for defining a relativistic positioning and navigation system, based on the use of four-dimensional bases of null four-vectors, in flat spacetime. As a prototypical case, we show how pulsars can be used to define such a p... |
gr-qc/9910014 | Marcelo B. Ribeiro | Marcelo B. Ribeiro (1 and 2) ((1) Vatican Group, Steward Observatory,
U. Arizona, (2) Physics Institute, U. Brazil - UFRJ, Rio de Janeiro) | Limited Frequency Range Observations of Cosmological Point Sources | 11 pages, LaTeX. Improved text, typos corrected, references added.
Accepted for publication in "The Observatory" | Observatory 122 (2002) 201-210 | null | null | gr-qc astro-ph | null | This paper advances a general proposal for testing non-standard cosmological
models by means of observational relations of cosmological point sources in
some specific waveband, and their use in the context of the data provided by
the galaxy redshift surveys, but for any cosmological metric. By starting from
the gener... | [
{
"created": "Mon, 4 Oct 1999 23:49:51 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jun 2002 00:37:11 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Ribeiro",
"Marcelo B.",
"",
"1 and 2"
]
] | This paper advances a general proposal for testing non-standard cosmological models by means of observational relations of cosmological point sources in some specific waveband, and their use in the context of the data provided by the galaxy redshift surveys, but for any cosmological metric. By starting from the general... |
gr-qc/9905029 | Alex Kaganovich | E. I. Guendelman and A. B. Kaganovich | Dynamical measure and field theory models free of the cosmological
constant problem | Extended version of the contribution to the fourth Alexander
Friedmann International Seminar on Gravitation and Cosmology; accepted for
publication in Phys. Rev. D; 31 pages | Phys.Rev.D60:065004,1999 | 10.1103/PhysRevD.60.065004 | null | gr-qc hep-th | null | Summary of abstract Field theory models including gauge theories with SSB are
presented where the energy density of the true vacuum state (TVS) is zero
without fine tuning. The above models are constructed in the gravitational
theory where a measure of integration \Phi in the action is not necessarily
\sqrt{-g} but i... | [
{
"created": "Mon, 10 May 1999 09:32:47 GMT",
"version": "v1"
}
] | 2011-04-20 | [
[
"Guendelman",
"E. I.",
""
],
[
"Kaganovich",
"A. B.",
""
]
] | Summary of abstract Field theory models including gauge theories with SSB are presented where the energy density of the true vacuum state (TVS) is zero without fine tuning. The above models are constructed in the gravitational theory where a measure of integration \Phi in the action is not necessarily \sqrt{-g} but it ... |
2208.02690 | Igor Bogush M.Sc. | Kirill Kobialko, Igor Bogush, Dmitri Gal'tsov | The geometry of massive particle surfaces | 30 pages, revtex4, 5 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a generalization of Claudel, Virbhadra, and Ellis photon surfaces
to the case of massive charged particles, considering a timelike hypersurface
such that any worldline of a particle with mass $m$, electric charge $q$ and
fixed total energy $\mathcal{E}$, initially touching it, will remain in this
hypersurf... | [
{
"created": "Thu, 4 Aug 2022 14:42:27 GMT",
"version": "v1"
}
] | 2022-08-05 | [
[
"Kobialko",
"Kirill",
""
],
[
"Bogush",
"Igor",
""
],
[
"Gal'tsov",
"Dmitri",
""
]
] | We propose a generalization of Claudel, Virbhadra, and Ellis photon surfaces to the case of massive charged particles, considering a timelike hypersurface such that any worldline of a particle with mass $m$, electric charge $q$ and fixed total energy $\mathcal{E}$, initially touching it, will remain in this hypersurfac... |
0810.0079 | Shahar Hod | Shahar Hod | Return of the quantum cosmic censor | 5 pages | Phys.Lett.B668:346-349,2008 | 10.1016/j.physletb.2008.08.059 | null | gr-qc astro-ph hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The influential theorems of Hawking and Penrose demonstrate that spacetime
singularities are ubiquitous features of general relativity, Einstein's theory
of gravity. The utility of classical general relativity in describing
gravitational phenomena is maintained by the cosmic censorship principle. This
conjecture, who... | [
{
"created": "Wed, 1 Oct 2008 06:35:50 GMT",
"version": "v1"
}
] | 2009-01-09 | [
[
"Hod",
"Shahar",
""
]
] | The influential theorems of Hawking and Penrose demonstrate that spacetime singularities are ubiquitous features of general relativity, Einstein's theory of gravity. The utility of classical general relativity in describing gravitational phenomena is maintained by the cosmic censorship principle. This conjecture, whose... |
gr-qc/9811093 | Mark D. Roberts | Mark D. Roberts | Spacetime Exterior to a Star: Against Asymptotic Flatness | Five references added, some small changes | null | null | uct-cosmology-99/08 | gr-qc astro-ph | null | In many circumstances the perfect fluid conservation equations can be
directly integrated to give a Geometric-Thermodynamic equation: typically that
the lapse $N$ is the reciprocal of the enthalphy $h$, ($ N=1/h$). This result
is aesthetically appealing as it depends only on the fluid conservation
equations and does ... | [
{
"created": "Sat, 28 Nov 1998 13:43:08 GMT",
"version": "v1"
},
{
"created": "Sat, 13 Nov 1999 12:19:10 GMT",
"version": "v2"
},
{
"created": "Sat, 11 Mar 2000 16:47:04 GMT",
"version": "v3"
},
{
"created": "Tue, 4 Jul 2000 17:38:24 GMT",
"version": "v4"
},
{
"cr... | 2007-05-23 | [
[
"Roberts",
"Mark D.",
""
]
] | In many circumstances the perfect fluid conservation equations can be directly integrated to give a Geometric-Thermodynamic equation: typically that the lapse $N$ is the reciprocal of the enthalphy $h$, ($ N=1/h$). This result is aesthetically appealing as it depends only on the fluid conservation equations and does no... |
1202.3445 | Claude Warnick | C. M. Warnick | The massive wave equation in asymptotically AdS spacetimes | Minor changes, 26 pages | Commun.Math.Phys. 321 (2013) 85-111 | 10.1007/s00220-013-1720-3 | ALBERTA THY 3-12 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the massive wave equation on asymptotically AdS spaces. We show
that the timelike scri behaves like a finite timelike boundary, on which one
may impose the equivalent of Dirichlet, Neumann or Robin conditions for a range
of (negative) mass parameter which includes the conformally coupled case. We
demonstr... | [
{
"created": "Wed, 15 Feb 2012 21:08:28 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Mar 2012 18:52:23 GMT",
"version": "v2"
},
{
"created": "Mon, 28 Jul 2014 09:43:27 GMT",
"version": "v3"
}
] | 2014-07-29 | [
[
"Warnick",
"C. M.",
""
]
] | We consider the massive wave equation on asymptotically AdS spaces. We show that the timelike scri behaves like a finite timelike boundary, on which one may impose the equivalent of Dirichlet, Neumann or Robin conditions for a range of (negative) mass parameter which includes the conformally coupled case. We demonstrat... |
1801.02249 | Sarah Geller | Sarah R. Geller, Jolyon K. Bloomfield, Alan H. Guth | Mass of a Patch of an FRW Universe | 9 figures, 12 pages | null | null | MIT-CTP/4971 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In 1963, Zel'dovich devised a method to define the mass of a closed
Friedmann-Robertson-Walker (FRW) universe, showing that by this definition it
is exactly zero. Rounding out this result, we show that the masses of flat and
open universes are (unsurprisingly) divergent. We also present closed-form
solutions for the ... | [
{
"created": "Sun, 7 Jan 2018 20:55:07 GMT",
"version": "v1"
}
] | 2018-01-09 | [
[
"Geller",
"Sarah R.",
""
],
[
"Bloomfield",
"Jolyon K.",
""
],
[
"Guth",
"Alan H.",
""
]
] | In 1963, Zel'dovich devised a method to define the mass of a closed Friedmann-Robertson-Walker (FRW) universe, showing that by this definition it is exactly zero. Rounding out this result, we show that the masses of flat and open universes are (unsurprisingly) divergent. We also present closed-form solutions for the tr... |
gr-qc/0108050 | Taylan Yetkin | Ali Havare, Taylan Yetkin | Exact Solution of Photon Equation in Stationary G\"{o}del-type and
G\"{o}del Space-Times | 9 pages,RevTeX, no figure, revised for publication | Class.Quant.Grav.19:2783-2792,2002 | 10.1088/0264-9381/19/11/303 | null | gr-qc | null | In this work the photon equation (massless Duffin-Kemmer-Petiau equation) is
written expilicitly for general type of stationary G\"{o}del space-times and is
solved exactly for G\"{o}del-type and G\"{o}del space-times. Harmonic
oscillator behaviour of the solutions is discussed and energy spectrum of
photon is obtaine... | [
{
"created": "Mon, 20 Aug 2001 10:31:36 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Nov 2001 22:30:49 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Havare",
"Ali",
""
],
[
"Yetkin",
"Taylan",
""
]
] | In this work the photon equation (massless Duffin-Kemmer-Petiau equation) is written expilicitly for general type of stationary G\"{o}del space-times and is solved exactly for G\"{o}del-type and G\"{o}del space-times. Harmonic oscillator behaviour of the solutions is discussed and energy spectrum of photon is obtained. |
gr-qc/0612054 | Roldao da Rocha | Julio M. Hoff da Silva and Roldao da Rocha | Shortcuts in particle production in a toroidal compactified spacetime | 5 pages, RevTeX, to be published in Int.J.Mod.Phys.D 11 (2007) | Int.J.Mod.Phys.D16:1853-1861,2007 | 10.1142/S0218271807011140 | null | gr-qc | null | We investigate the particle production in a toroidal compactified spacetime
due to the expansion of a Friedmann cosmological model in R3 x S1 outside a
U(1) local cosmic string. The case of a Friedmann spacetime is also
investigated when torsion is incorporated in the connection. We present a
generalization to toroid... | [
{
"created": "Fri, 8 Dec 2006 20:56:19 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Dec 2006 21:25:54 GMT",
"version": "v2"
},
{
"created": "Tue, 6 Mar 2007 18:37:29 GMT",
"version": "v3"
},
{
"created": "Fri, 9 Nov 2007 19:23:59 GMT",
"version": "v4"
}
] | 2009-02-18 | [
[
"da Silva",
"Julio M. Hoff",
""
],
[
"da Rocha",
"Roldao",
""
]
] | We investigate the particle production in a toroidal compactified spacetime due to the expansion of a Friedmann cosmological model in R3 x S1 outside a U(1) local cosmic string. The case of a Friedmann spacetime is also investigated when torsion is incorporated in the connection. We present a generalization to toroidal... |
gr-qc/9709033 | Eric Poisson | William G. Laarakkers and Eric Poisson | Quadrupole moments of rotating neutron stars | ReVTeX, 7 pages, 5 figures, additional material, and references added | null | 10.1086/306732 | null | gr-qc | null | Numerical models of rotating neutron stars are constructed for four equations
of state using the computer code RNS written by Stergioulas. For five selected
values of the star's gravitational mass (in the interval between 1.0 and 1.8
solar masses) and for each equation of state, the star's angular momentum is
varied ... | [
{
"created": "Fri, 12 Sep 1997 20:33:10 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Mar 1998 00:28:00 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Laarakkers",
"William G.",
""
],
[
"Poisson",
"Eric",
""
]
] | Numerical models of rotating neutron stars are constructed for four equations of state using the computer code RNS written by Stergioulas. For five selected values of the star's gravitational mass (in the interval between 1.0 and 1.8 solar masses) and for each equation of state, the star's angular momentum is varied fr... |
2209.00952 | Mohammed Alzain | Mohammed Alzain | General Relativity and the Ricci Flow | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In Riemannian geometry, the Ricci flow is the analogue of heat diffusion; a
deformation of the metric tensor driven by its Ricci curvature. As a step
towards resolving the problem of time in quantum gravity, we attempt to merge
the Ricci flow equation with the Hamilton-Jacobi equation for general
relativity.
| [
{
"created": "Fri, 2 Sep 2022 11:17:20 GMT",
"version": "v1"
}
] | 2022-09-05 | [
[
"Alzain",
"Mohammed",
""
]
] | In Riemannian geometry, the Ricci flow is the analogue of heat diffusion; a deformation of the metric tensor driven by its Ricci curvature. As a step towards resolving the problem of time in quantum gravity, we attempt to merge the Ricci flow equation with the Hamilton-Jacobi equation for general relativity. |
1502.04693 | Maxim Eingorn | Ozgur Akarsu, Mariam Bouhmadi-L\'opez, Maxim Brilenkov, Ruslan
Brilenkov, Maxim Eingorn, Alexander Zhuk | Are dark energy models with variable EoS parameter $w$ compatible with
the late inhomogeneous Universe? | 14 pages, no figures | JCAP 07 (2015) 038 | 10.1088/1475-7516/2015/07/038 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the late-time evolution of the Universe where dark energy (DE) is
presented by a barotropic fluid on top of cold dark matter (CDM). We also take
into account the radiation content of the Universe. Here by the late stage of
the evolution we refer to the epoch where CDM is already clustered into
inhomogeneousl... | [
{
"created": "Mon, 16 Feb 2015 20:56:55 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Jul 2015 19:44:30 GMT",
"version": "v2"
}
] | 2015-07-24 | [
[
"Akarsu",
"Ozgur",
""
],
[
"Bouhmadi-López",
"Mariam",
""
],
[
"Brilenkov",
"Maxim",
""
],
[
"Brilenkov",
"Ruslan",
""
],
[
"Eingorn",
"Maxim",
""
],
[
"Zhuk",
"Alexander",
""
]
] | We study the late-time evolution of the Universe where dark energy (DE) is presented by a barotropic fluid on top of cold dark matter (CDM). We also take into account the radiation content of the Universe. Here by the late stage of the evolution we refer to the epoch where CDM is already clustered into inhomogeneously ... |
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