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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2207.02106 | Rahul Kumar | Rahul Kumar Walia | Observational predictions of LQG motivated polymerized black holes and
constraints from Sgr A* and M87* | 46 pages, 20 figures and 5 tables. Matched with the published version | JCAP 03, 029 (2023) | 10.1088/1475-7516/2023/03/029 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Loop quantum gravity inspired partial polymer quantization in
four-dimensional spacetime leads to a globally regular black hole with a single
horizon. The polymerized black hole metric is characterized by the minimum
length parameter $k$, and mimics the Schwarzschild black hole in the weak-field
limit. We present an ... | [
{
"created": "Tue, 5 Jul 2022 15:20:27 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Mar 2023 01:11:04 GMT",
"version": "v2"
}
] | 2023-03-14 | [
[
"Walia",
"Rahul Kumar",
""
]
] | Loop quantum gravity inspired partial polymer quantization in four-dimensional spacetime leads to a globally regular black hole with a single horizon. The polymerized black hole metric is characterized by the minimum length parameter $k$, and mimics the Schwarzschild black hole in the weak-field limit. We present an an... |
gr-qc/0505134 | C\'edric Deffayet | Cedric Deffayet, Jan-Willem Rombouts | Ghosts, Strong Coupling and Accidental Symmetries in Massive Gravity | 21 pages | Phys.Rev.D72:044003,2005 | 10.1103/PhysRevD.72.044003 | null | gr-qc hep-ph hep-th | null | We show that the strong self-interaction of the scalar polarization of a
massive graviton can be understood in terms of the propagation of an extra
ghost-like degree of freedom, thus relating strong coupling to the sixth degree
of freedom discussed by Boulware and Deser in their Hamiltonian analysis of
massive gravit... | [
{
"created": "Thu, 26 May 2005 17:18:13 GMT",
"version": "v1"
}
] | 2009-10-07 | [
[
"Deffayet",
"Cedric",
""
],
[
"Rombouts",
"Jan-Willem",
""
]
] | We show that the strong self-interaction of the scalar polarization of a massive graviton can be understood in terms of the propagation of an extra ghost-like degree of freedom, thus relating strong coupling to the sixth degree of freedom discussed by Boulware and Deser in their Hamiltonian analysis of massive gravity.... |
gr-qc/0212029 | Sandro Silva e Costa | Sandro Silva e Costa (IAG-USP) | The harmonic oscillator, dimensional analysis and inflationary solutions | 6 pages, revtex4, no figures | null | null | null | gr-qc astro-ph | null | In this work, focused on the production of exact inflationary solutions using
dimensional analysis, it is shown how to explain inflation from a pragmatic and
basic point of view, in a step-by-step process, starting from the
one-dimensional harmonic oscillator.
| [
{
"created": "Fri, 6 Dec 2002 02:21:19 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Costa",
"Sandro Silva e",
"",
"IAG-USP"
]
] | In this work, focused on the production of exact inflationary solutions using dimensional analysis, it is shown how to explain inflation from a pragmatic and basic point of view, in a step-by-step process, starting from the one-dimensional harmonic oscillator. |
1803.02135 | Jian-dong Zhang | Changfu Shi, Jian-dong Zhang, Jianwei Mei | Hidden Conformal Symmetry for Vector Field on Various Black Hole
Backgrounds | 18 pages, no figure, matches the published version | JHEP04(2018)001 | 10.1007/JHEP04(2018)001 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hidden conformal symmetries of scalar field on various black hole backgrounds
have been investigated for years, but whether those features holds for other
fields are still open questions. Recently, with proper assumptions, Lunin
achieves to the separation of variables for Maxwell equations on Kerr
background. In this... | [
{
"created": "Tue, 6 Mar 2018 12:15:44 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Apr 2018 05:20:22 GMT",
"version": "v2"
}
] | 2018-04-10 | [
[
"Shi",
"Changfu",
""
],
[
"Zhang",
"Jian-dong",
""
],
[
"Mei",
"Jianwei",
""
]
] | Hidden conformal symmetries of scalar field on various black hole backgrounds have been investigated for years, but whether those features holds for other fields are still open questions. Recently, with proper assumptions, Lunin achieves to the separation of variables for Maxwell equations on Kerr background. In this p... |
1807.00180 | Orlando Luongo | Orlando Luongo, Marco Muccino | Speeding up the universe using dust with pressure | 11 pages, 2 figures, accepted for publication in Phys. Rev. D | Phys. Rev. D 98, 103520 (2018) | 10.1103/PhysRevD.98.103520 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revise the cosmological standard model presuming that matter, i.e. baryons
and cold dark matter, exhibits a non-vanishing pressure mimicking the
cosmological constant effects. In particular, we propose a scalar field
Lagrangian $\mathcal L_1$ for matter with the introduction of a Lagrange
multiplier as constraint.... | [
{
"created": "Sat, 30 Jun 2018 14:00:16 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Nov 2018 11:04:45 GMT",
"version": "v2"
}
] | 2018-11-28 | [
[
"Luongo",
"Orlando",
""
],
[
"Muccino",
"Marco",
""
]
] | We revise the cosmological standard model presuming that matter, i.e. baryons and cold dark matter, exhibits a non-vanishing pressure mimicking the cosmological constant effects. In particular, we propose a scalar field Lagrangian $\mathcal L_1$ for matter with the introduction of a Lagrange multiplier as constraint. W... |
2404.06509 | Yixuan Ma | Yixuan Ma and Luciano Rezzolla | Horizon-penetrating form of parametrized metrics for static and
stationary black holes | 15 pages, submitted to PRD, matching the accepted version | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Rezzolla-Zhidenko (RZ) and Konoplya-Rezzolla-Zhidenko (KRZ) frameworks
provide an efficient approach to characterize agnostically spherically
symmetric or stationary black-hole spacetimes in arbitrary metric theories. In
their original construction, these metrics were defined only in the spacetime
region outside ... | [
{
"created": "Tue, 9 Apr 2024 17:59:04 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Apr 2024 18:00:21 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Jun 2024 18:00:03 GMT",
"version": "v3"
}
] | 2024-06-19 | [
[
"Ma",
"Yixuan",
""
],
[
"Rezzolla",
"Luciano",
""
]
] | The Rezzolla-Zhidenko (RZ) and Konoplya-Rezzolla-Zhidenko (KRZ) frameworks provide an efficient approach to characterize agnostically spherically symmetric or stationary black-hole spacetimes in arbitrary metric theories. In their original construction, these metrics were defined only in the spacetime region outside of... |
0912.2920 | Sebastiano Bernuzzi | Sebastiano Bernuzzi and David Hilditch | Constraint violation in free evolution schemes: comparing BSSNOK with a
conformal decomposition of Z4 | Published in PRD | Phys.Rev.D81:084003,2010 | 10.1103/PhysRevD.81.084003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compare numerical evolutions performed with the BSSNOK formulation and a
conformal decomposition of a Z4-like formulation of General Relativity. The
important difference between the two formulations is that the Z4 formulation
has a propagating Hamiltonian constraint, whereas BSSNOK has a zero-speed
characteristic ... | [
{
"created": "Tue, 15 Dec 2009 15:12:17 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Apr 2010 16:38:50 GMT",
"version": "v2"
}
] | 2010-04-29 | [
[
"Bernuzzi",
"Sebastiano",
""
],
[
"Hilditch",
"David",
""
]
] | We compare numerical evolutions performed with the BSSNOK formulation and a conformal decomposition of a Z4-like formulation of General Relativity. The important difference between the two formulations is that the Z4 formulation has a propagating Hamiltonian constraint, whereas BSSNOK has a zero-speed characteristic va... |
2202.08142 | Soumya Chakrabarti | Soumya Chakrabarti | On Generalized Theories of Varying Fine Structure Constant | 20 pages; 25 figures; manuscript in communication; comments are
welcome | null | 10.1093/mnras/stac979 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We work with a class of scalar extended theory of gravity that can drive the
present cosmic acceleration as well as accommodate a mild cosmic variation of
the fine structure constant $\alpha$. The motivation comes from a vintage
theory developed by Bekenstein, Sandvik, Barrow and Magueijo. The $\alpha$
variation is i... | [
{
"created": "Wed, 16 Feb 2022 15:33:07 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Feb 2022 06:42:48 GMT",
"version": "v2"
}
] | 2022-04-20 | [
[
"Chakrabarti",
"Soumya",
""
]
] | We work with a class of scalar extended theory of gravity that can drive the present cosmic acceleration as well as accommodate a mild cosmic variation of the fine structure constant $\alpha$. The motivation comes from a vintage theory developed by Bekenstein, Sandvik, Barrow and Magueijo. The $\alpha$ variation is int... |
gr-qc/0403030 | Jiliang Jing | M. Giammatteo and Jiliang Jing | Dirac quasinormal frequencies in Schwarzschild-AdS space-time | 13 pages, 6 figures | Phys.Rev. D71 (2005) 024007 | 10.1103/PhysRevD.71.024007 | null | gr-qc astro-ph hep-th | null | We investigate the quasinormal mode frequencies for the massless Dirac field
in static four dimensional $AdS$ space-time. The separation of the Dirac
equation is achieved for the first time in $AdS$ space. Besides the relevance
that this calculation can have in the framework of the $AdS/CFT$ correspondence
between M-... | [
{
"created": "Sun, 7 Mar 2004 05:53:19 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Dec 2004 08:08:22 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Giammatteo",
"M.",
""
],
[
"Jing",
"Jiliang",
""
]
] | We investigate the quasinormal mode frequencies for the massless Dirac field in static four dimensional $AdS$ space-time. The separation of the Dirac equation is achieved for the first time in $AdS$ space. Besides the relevance that this calculation can have in the framework of the $AdS/CFT$ correspondence between M-th... |
gr-qc/0006091 | Bela Szilagyi | Bela Szilagyi | Cauchy-Characteristic Matching In General Relativity | 16 LaTeX files, 1 bibliography (bbl) file, 1 style file, 68
PostScript figures | Ph.D. Thesis, University of Pittsburgh, 2000 | null | null | gr-qc | null | From Einstein's theory we know that besides the electromagnetic spectrum,
objects like quasars, active galactic nuclei, pulsars and black holes also
generate a physical signal of purely gravitational nature. The actual form of
the signal is impossible to determine analytically, which lead to use of
numerical methods.... | [
{
"created": "Mon, 26 Jun 2000 21:22:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Szilagyi",
"Bela",
""
]
] | From Einstein's theory we know that besides the electromagnetic spectrum, objects like quasars, active galactic nuclei, pulsars and black holes also generate a physical signal of purely gravitational nature. The actual form of the signal is impossible to determine analytically, which lead to use of numerical methods. T... |
0711.0332 | Gilles Esposito-Farese | Gilles Esposito-Farese | Summary of session A4 at the GRG18 conference: Alternative Theories of
Gravity | 9 pages, no figure; the GRG18 conference was held in Sydney,
Australia, 8-13 July 2007 | Class.Quant.Grav.25:114017,2008 | 10.1088/0264-9381/25/11/114017 | null | gr-qc | null | More than 50 abstracts were submitted to the A4 session on "Alternatives
Theories of Gravity" at the GRG18 conference. About 30 of them were scheduled
as oral presentations, that we summarize below. We do not intend to give a
critical review, but rather pointers to the corresponding papers. The main
topics were (i) b... | [
{
"created": "Fri, 2 Nov 2007 15:51:12 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Esposito-Farese",
"Gilles",
""
]
] | More than 50 abstracts were submitted to the A4 session on "Alternatives Theories of Gravity" at the GRG18 conference. About 30 of them were scheduled as oral presentations, that we summarize below. We do not intend to give a critical review, but rather pointers to the corresponding papers. The main topics were (i) bra... |
1501.07322 | Barry Wardell | Barry Wardell | Self-force: Computational Strategies | Synchronized with final published version. Review to appear in
"Equations of Motion in Relativistic Gravity", published as part of the
Springer "Fundamental Theories of Physics" series. D. Puetzfeld et al.
(eds.), Equations of Motion in Relativistic Gravity, Fundamental Theories of
Physics 179, Springer, 2015 | null | 10.1007/978-3-319-18335-0_14 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Building on substantial foundational progress in understanding the effect of
a small body's self-field on its own motion, the past 15 years has seen the
emergence of several strategies for explicitly computing self-field corrections
to the equations of motion of a small, point-like charge. These approaches
broadly fa... | [
{
"created": "Thu, 29 Jan 2015 01:06:53 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Feb 2015 23:23:14 GMT",
"version": "v2"
},
{
"created": "Tue, 2 Jun 2015 11:53:32 GMT",
"version": "v3"
}
] | 2021-04-07 | [
[
"Wardell",
"Barry",
""
]
] | Building on substantial foundational progress in understanding the effect of a small body's self-field on its own motion, the past 15 years has seen the emergence of several strategies for explicitly computing self-field corrections to the equations of motion of a small, point-like charge. These approaches broadly fall... |
1801.08028 | Gao-Ming Deng | Gao-Ming Deng, Jinbo Fan, Xinfei Li, Yong-Chang Huang | Thermodynamics and phase transition of charged AdS black holes with a
global monopole | 13 pages, 9 figures, comments welcome | null | 10.1142/S0217751X18500227 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Thermodynamical properties of charged AdS black holes with a global monopole
still remain obscure. In this paper, we investigate the thermodynamics and
phase transition of the black holes in the extended phase space. It is shown
that thermodynamical quantities of the black holes exhibit an interesting
dependence on t... | [
{
"created": "Wed, 24 Jan 2018 15:37:58 GMT",
"version": "v1"
}
] | 2018-02-28 | [
[
"Deng",
"Gao-Ming",
""
],
[
"Fan",
"Jinbo",
""
],
[
"Li",
"Xinfei",
""
],
[
"Huang",
"Yong-Chang",
""
]
] | Thermodynamical properties of charged AdS black holes with a global monopole still remain obscure. In this paper, we investigate the thermodynamics and phase transition of the black holes in the extended phase space. It is shown that thermodynamical quantities of the black holes exhibit an interesting dependence on the... |
0812.1574 | Eyo Ita III | Eyo Eyo Ita III | Nonlinear gravitons in 4-D general relativity by expansion about the
Kodama state | 21 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we provide a possible realization of Penrose's idea of
nonlinear gravitons using a new description of nonmetric general relativity. In
the addressal of issues surrounding the normalizability of the Kodama state and
its reliability as a ground state for gravity, we expand the theory in
fluctuations about... | [
{
"created": "Mon, 8 Dec 2008 21:31:13 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Jul 2009 09:06:04 GMT",
"version": "v2"
},
{
"created": "Sat, 4 Sep 2010 16:48:32 GMT",
"version": "v3"
}
] | 2010-09-07 | [
[
"Ita",
"Eyo Eyo",
"III"
]
] | In this paper we provide a possible realization of Penrose's idea of nonlinear gravitons using a new description of nonmetric general relativity. In the addressal of issues surrounding the normalizability of the Kodama state and its reliability as a ground state for gravity, we expand the theory in fluctuations about t... |
0705.3475 | Mauricio Bellini | Mariano Anabitarte (Mar del Plata University - CONICET), Mauricio
Bellini (Mar del Plata University - CONICET) | Gauge invariant metric fluctuations in the early universe from STM
theory of gravity: nonperturbative formalism | version accepted in Physics Letters B | Phys.Lett.B652:233-237,2007 | 10.1016/j.physletb.2007.07.028 | null | gr-qc hep-th | null | We develop a nonperturbative quantum field formalism to describe scalar
gauge-invariant metric flucturations in the early universe from a 5D apparent
(Ricci flat) vacuum.
| [
{
"created": "Wed, 23 May 2007 22:04:08 GMT",
"version": "v1"
},
{
"created": "Wed, 30 May 2007 20:19:17 GMT",
"version": "v2"
},
{
"created": "Fri, 6 Jul 2007 17:27:25 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Anabitarte",
"Mariano",
"",
"Mar del Plata University - CONICET"
],
[
"Bellini",
"Mauricio",
"",
"Mar del Plata University - CONICET"
]
] | We develop a nonperturbative quantum field formalism to describe scalar gauge-invariant metric flucturations in the early universe from a 5D apparent (Ricci flat) vacuum. |
2203.11551 | Zheng-Wen Long | Yi Yang, Dong Liu, Ali \"Ovg\"un, Zheng-Wen Long, Zhaoyi Xu | Probing hairy black holes caused by gravitational decoupling using
quasinormal modes and greybody bounds | null | Phys. Rev. D 107, 064042 (2023) | 10.1103/PhysRevD.107.064042 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational decoupling can add hair to the black holes by adding extra
sources. The quasinormal modes of hairy black hole caused by gravitational
decoupling for the massless scalar field, electromagnetic field, and
gravitational perturbation are investigated. The equations of effective
potential for three perturbat... | [
{
"created": "Tue, 22 Mar 2022 09:11:56 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Apr 2022 15:55:44 GMT",
"version": "v2"
},
{
"created": "Fri, 8 Apr 2022 15:15:56 GMT",
"version": "v3"
},
{
"created": "Tue, 21 Jun 2022 15:55:10 GMT",
"version": "v4"
},
{
"cre... | 2023-03-24 | [
[
"Yang",
"Yi",
""
],
[
"Liu",
"Dong",
""
],
[
"Övgün",
"Ali",
""
],
[
"Long",
"Zheng-Wen",
""
],
[
"Xu",
"Zhaoyi",
""
]
] | Gravitational decoupling can add hair to the black holes by adding extra sources. The quasinormal modes of hairy black hole caused by gravitational decoupling for the massless scalar field, electromagnetic field, and gravitational perturbation are investigated. The equations of effective potential for three perturbatio... |
1911.11054 | Dharm Veer Singh | Dharm Veer Singh, Sushant G. Ghosh and Sunil D. Maharaj | Bardeen-like regular black holes in $5D$ Einstein-Gauss-Bonnet gravity | 20 pages, 7 figures | Annals of Physics 412, 168025 (2020) | 10.1016/j.aop.2019.168025 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find an exact spherically symmetric regular Bardeen-like solutions by
considering the coupling between Einstein-Gauss-Bonnet theory and nonlinear
electrodynamics (NED) in five-dimensional spacetime. These solutions, with an
additional parameter $g$ apart from the mass $M$, represent black holes with
Cauchy and eve... | [
{
"created": "Mon, 25 Nov 2019 17:09:17 GMT",
"version": "v1"
}
] | 2019-11-26 | [
[
"Singh",
"Dharm Veer",
""
],
[
"Ghosh",
"Sushant G.",
""
],
[
"Maharaj",
"Sunil D.",
""
]
] | We find an exact spherically symmetric regular Bardeen-like solutions by considering the coupling between Einstein-Gauss-Bonnet theory and nonlinear electrodynamics (NED) in five-dimensional spacetime. These solutions, with an additional parameter $g$ apart from the mass $M$, represent black holes with Cauchy and event... |
0802.3927 | Ivan Avramidi | Ivan G. Avramidi and Guglielmo Fucci | Kinematics in Matrix Gravity | 31 pages, no figures, discussion of Pioneer anomaly removed | Gen.Rel.Grav.41:1407-1435,2009 | 10.1007/s10714-008-0713-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop the kinematics in Matrix Gravity, which is a modified theory of
gravity obtained by a non-commutative deformation of General Relativity. In
this model the usual interpretation of gravity as Riemannian geometry is
replaced by a new kind of geometry, which is equivalent to a collection of
Finsler geometries ... | [
{
"created": "Tue, 26 Feb 2008 22:31:11 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Nov 2008 22:40:02 GMT",
"version": "v2"
}
] | 2011-02-18 | [
[
"Avramidi",
"Ivan G.",
""
],
[
"Fucci",
"Guglielmo",
""
]
] | We develop the kinematics in Matrix Gravity, which is a modified theory of gravity obtained by a non-commutative deformation of General Relativity. In this model the usual interpretation of gravity as Riemannian geometry is replaced by a new kind of geometry, which is equivalent to a collection of Finsler geometries wi... |
gr-qc/0510087 | Nakia Carlevaro | Nakia Carlevaro and Giovanni Montani | On the Gravitational Collapse of a Gas Cloud in Presence of Bulk
Viscosity | 13 pages, no figure | Class. Quant. Grav. 22, 4715-4728 (2005) | 10.1088/0264-9381/22/22/005 | null | gr-qc astro-ph | null | We analyze the effects induced by the bulk viscosity on the dynamics
associated to the extreme gravitational collapse. Aim of the work is to
investigate whether the presence of viscous corrections to the evolution of a
collapsing gas cloud influence the fragmentation process. To this end we study
the dynamics of a un... | [
{
"created": "Wed, 19 Oct 2005 11:02:33 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Jan 2007 17:11:09 GMT",
"version": "v2"
},
{
"created": "Thu, 12 Apr 2007 09:40:36 GMT",
"version": "v3"
},
{
"created": "Sat, 23 Jun 2007 15:58:12 GMT",
"version": "v4"
}
] | 2009-11-11 | [
[
"Carlevaro",
"Nakia",
""
],
[
"Montani",
"Giovanni",
""
]
] | We analyze the effects induced by the bulk viscosity on the dynamics associated to the extreme gravitational collapse. Aim of the work is to investigate whether the presence of viscous corrections to the evolution of a collapsing gas cloud influence the fragmentation process. To this end we study the dynamics of a unif... |
2103.04369 | Minyong Guo | Yehui Hou, Minyong Guo and Bin Chen | Revisiting the shadow of braneworld black holes | 22 pages, 13 figures | Phys. Rev. D 104, 024001 (2021) | 10.1103/PhysRevD.104.024001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the shadows of rotating braneworld black holes in the
Randall-Sundrum type II model, by considering not only the metric in the near
region of the black hole but also the linearized metric in the far region where
the observer stays. Our study is significantly different from previous studies,
which relies on... | [
{
"created": "Sun, 7 Mar 2021 14:58:29 GMT",
"version": "v1"
}
] | 2021-07-07 | [
[
"Hou",
"Yehui",
""
],
[
"Guo",
"Minyong",
""
],
[
"Chen",
"Bin",
""
]
] | We revisit the shadows of rotating braneworld black holes in the Randall-Sundrum type II model, by considering not only the metric in the near region of the black hole but also the linearized metric in the far region where the observer stays. Our study is significantly different from previous studies, which relies only... |
1608.00739 | Marcelo Schiffer | Marcelo Schiffer | Charge Fluctuations of an Uncharged Black Hole | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we calculate charge fluctuations of a Schwarzschild black-hole
of mass $M$ confined within a perfectly reflecting cavity of radius R in
thermal equilibrium with various species of radiation and fermions . Charge
conservation is constrained by a Lagrange multiplier (the chemical potential).
Black hole ch... | [
{
"created": "Tue, 2 Aug 2016 08:58:58 GMT",
"version": "v1"
}
] | 2016-08-03 | [
[
"Schiffer",
"Marcelo",
""
]
] | In this paper we calculate charge fluctuations of a Schwarzschild black-hole of mass $M$ confined within a perfectly reflecting cavity of radius R in thermal equilibrium with various species of radiation and fermions . Charge conservation is constrained by a Lagrange multiplier (the chemical potential). Black hole char... |
2302.03545 | Yumin Hu | Yu-Min Hu, Yaqi Zhao, Xin Ren, Bo Wang, Emmanuel N. Saridakis, Yi-Fu
Cai | The effective field theory approach to the strong coupling issue in
$f(T)$ gravity | 18 pages | JCAP 07 (2023) 060 | 10.1088/1475-7516/2023/07/060 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the scalar perturbations and the possible strong coupling
issues of $f(T)$ around a cosmological background, applying the effective field
theory (EFT) approach. We revisit the generalized EFT framework of modified
teleparallel gravity and apply it by considering both linear and second-order
perturbatio... | [
{
"created": "Tue, 7 Feb 2023 15:54:04 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Jul 2023 09:08:11 GMT",
"version": "v2"
}
] | 2023-11-22 | [
[
"Hu",
"Yu-Min",
""
],
[
"Zhao",
"Yaqi",
""
],
[
"Ren",
"Xin",
""
],
[
"Wang",
"Bo",
""
],
[
"Saridakis",
"Emmanuel N.",
""
],
[
"Cai",
"Yi-Fu",
""
]
] | We investigate the scalar perturbations and the possible strong coupling issues of $f(T)$ around a cosmological background, applying the effective field theory (EFT) approach. We revisit the generalized EFT framework of modified teleparallel gravity and apply it by considering both linear and second-order perturbations... |
0811.2790 | Martin Bojowald | Martin Bojowald | Comment on "Quantum bounce and cosmic recall" [arXiv:0710.4543] | 1 page | Phys.Rev.Lett.101:209001,2008 | 10.1103/PhysRevLett.101.209001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recently derived inequality on volume fluctuations of a bouncing cosmology,
valid for states which are semiclassical long after the bounce, does not
restrict pre-bounce fluctuations sufficiently strongly to conclude that the
pre-bounce state was semiclassical except in a very weak sense.
| [
{
"created": "Mon, 17 Nov 2008 20:47:28 GMT",
"version": "v1"
}
] | 2008-12-18 | [
[
"Bojowald",
"Martin",
""
]
] | A recently derived inequality on volume fluctuations of a bouncing cosmology, valid for states which are semiclassical long after the bounce, does not restrict pre-bounce fluctuations sufficiently strongly to conclude that the pre-bounce state was semiclassical except in a very weak sense. |
2212.06914 | Chris Stevens | Chris Stevens, Oliver Markwell | Toward fixing a framework for conformal cyclic cosmology | 14 Pages, 1 figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Conformal Cyclic Cosmology (CCC) is a cyclic model of the universe put
forward by Sir Roger Penrose. A conformal invariance assumption in the
neighbourhood of the crossover region between cycles (which Penrose calls
aeons) allows successive space-times to be related by a conformal rescaling. A
major open problem is h... | [
{
"created": "Tue, 13 Dec 2022 21:36:19 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Dec 2022 05:55:37 GMT",
"version": "v2"
}
] | 2022-12-19 | [
[
"Stevens",
"Chris",
""
],
[
"Markwell",
"Oliver",
""
]
] | Conformal Cyclic Cosmology (CCC) is a cyclic model of the universe put forward by Sir Roger Penrose. A conformal invariance assumption in the neighbourhood of the crossover region between cycles (which Penrose calls aeons) allows successive space-times to be related by a conformal rescaling. A major open problem is how... |
0810.2264 | E Katsavounidis | J. Markowitz, M. Zanolin, L.Cadonati, and E. Katsavounidis | Gravitational Wave Burst Source Direction Estimation using Time and
Amplitude Information | 10 pages, 14 figures, submitted to PRD | Phys.Rev.D78:122003,2008 | 10.1103/PhysRevD.78.122003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we study two problems that arise when using timing and
amplitude estimates from a network of interferometers (IFOs) to evaluate the
direction of an incident gravitational wave burst (GWB). First, we discuss an
angular bias in the least squares timing-based approach that becomes
increasingly relevant f... | [
{
"created": "Mon, 13 Oct 2008 19:01:38 GMT",
"version": "v1"
}
] | 2009-01-08 | [
[
"Markowitz",
"J.",
""
],
[
"Zanolin",
"M.",
""
],
[
"Cadonati",
"L.",
""
],
[
"Katsavounidis",
"E.",
""
]
] | In this article we study two problems that arise when using timing and amplitude estimates from a network of interferometers (IFOs) to evaluate the direction of an incident gravitational wave burst (GWB). First, we discuss an angular bias in the least squares timing-based approach that becomes increasingly relevant for... |
2301.07019 | Phongpichit Channuie | Phongpichit Channuie (Walailak U.), Khamphee Karwan (Naresuan U.),
Jakkrit Sangtawee (Naresuan U.) | Observational Constraints and Preheating in Cuscuton Inflation | v2: 16 pages, no figure, version accepted for publication in European
Physical Journal C | Eur.Phys.J.C 83 (2023) 421 | 10.1140/epjc/s10052-023-11566-z | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study cuscuton inflation for the models where the potential of the
cuscuton takes quadratic and exponential forms. We find that for the quadratic
potential, a scalar spectral index $n_s$ is not affected by cuscuton at the
leading order in the slow-roll inflation models. However, a tensor-to-scalar
ratio $r$ can be... | [
{
"created": "Tue, 17 Jan 2023 17:08:54 GMT",
"version": "v1"
},
{
"created": "Mon, 1 May 2023 15:25:34 GMT",
"version": "v2"
}
] | 2023-05-23 | [
[
"Channuie",
"Phongpichit",
"",
"Walailak U."
],
[
"Karwan",
"Khamphee",
"",
"Naresuan U."
],
[
"Sangtawee",
"Jakkrit",
"",
"Naresuan U."
]
] | We study cuscuton inflation for the models where the potential of the cuscuton takes quadratic and exponential forms. We find that for the quadratic potential, a scalar spectral index $n_s$ is not affected by cuscuton at the leading order in the slow-roll inflation models. However, a tensor-to-scalar ratio $r$ can be s... |
0802.0658 | Enric Verdaguer | B.L. Hu and E. Verdaguer | Stochastic Gravity: Theory and Applications | 100 pages, no figures; an update of the 2003 review in Living Reviews
in Relativity gr-qc/0307032 ; it includes new sections on the Validity of
Semiclassical Gravity, the Stability of Minkowski Spacetime, and the Metric
Fluctuations of an Evaporating Black Hole | Living Rev. Relativity, 11 (2008) 3 | 10.12942/lrr-2008-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Whereas semiclassical gravity is based on the semiclassical Einstein equation
with sources given by the expectation value of the stress-energy tensor of
quantum fields, stochastic semiclassical gravity is based on the
Einstein-Langevin equation, which has in addition sources due to the noise
kernel. In the first part... | [
{
"created": "Tue, 5 Feb 2008 16:23:28 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Hu",
"B. L.",
""
],
[
"Verdaguer",
"E.",
""
]
] | Whereas semiclassical gravity is based on the semiclassical Einstein equation with sources given by the expectation value of the stress-energy tensor of quantum fields, stochastic semiclassical gravity is based on the Einstein-Langevin equation, which has in addition sources due to the noise kernel. In the first part, ... |
gr-qc/0004045 | Roberto De Pietri | Roberto De Pietri and Carlo Petronio | Feynman Diagrams of Generalized Matrix Models and the Associated
Manifolds in Dimension 4 | 25 pages, 10 figures. Minor canges | J.Math.Phys. 41 (2000) 6671-6688 | 10.1063/1.1290053 | null | gr-qc hep-lat hep-th | null | The problem of constructing a quantum theory of gravity has been tackled with
very different strategies, most of which relying on the interplay between ideas
from physics and from advanced mathematics. On the mathematical side, a central
role is played by combinatorial topology, often used to recover the space-time
m... | [
{
"created": "Fri, 14 Apr 2000 10:33:59 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Jun 2000 08:44:25 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"De Pietri",
"Roberto",
""
],
[
"Petronio",
"Carlo",
""
]
] | The problem of constructing a quantum theory of gravity has been tackled with very different strategies, most of which relying on the interplay between ideas from physics and from advanced mathematics. On the mathematical side, a central role is played by combinatorial topology, often used to recover the space-time man... |
1701.02731 | Uri Ben-Ya'acov | Uri Ben-Ya'acov | The 'twin paradox' in relativistic rigid motion | 16 pages, 6 figures | U. Ben-Ya'acov Euro.J.Phys. {\bf37} 055601, 069401 (2016) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Relativistic rigid motion suggests a new version for the so-called `twin
paradox', comparing the ages of two astronauts on a very long spaceship.
Although there is always an instantaneous inertial frame in which the whole
spaceship, being rigid, is simultaneously at rest, the twins' ages, measured as
the proper-times... | [
{
"created": "Mon, 9 Jan 2017 23:18:58 GMT",
"version": "v1"
}
] | 2017-01-12 | [
[
"Ben-Ya'acov",
"Uri",
""
]
] | Relativistic rigid motion suggests a new version for the so-called `twin paradox', comparing the ages of two astronauts on a very long spaceship. Although there is always an instantaneous inertial frame in which the whole spaceship, being rigid, is simultaneously at rest, the twins' ages, measured as the proper-times a... |
gr-qc/0402030 | Kirill Bronnikov | Kirill A. Bronnikov and Boris E. Meierovich | A general thick brane supported by a scalar field | 6 pages, gc style | Grav.Cosmol.9:313-318,2003 | null | null | gr-qc | null | A thick Z_2-symmetric domain wall supported by a scalar field with an
arbitrary potential V(\phi) in 5D general relativity is considered as a
candidate brane world. We show that, under the global regularity requirement,
such a configuration (i) has always an AdS asymptotic far from the brane, (ii)
is only possible if... | [
{
"created": "Thu, 5 Feb 2004 05:49:33 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Bronnikov",
"Kirill A.",
""
],
[
"Meierovich",
"Boris E.",
""
]
] | A thick Z_2-symmetric domain wall supported by a scalar field with an arbitrary potential V(\phi) in 5D general relativity is considered as a candidate brane world. We show that, under the global regularity requirement, such a configuration (i) has always an AdS asymptotic far from the brane, (ii) is only possible if V... |
1805.11340 | Romualdo Tresguerres | Romualdo Tresguerres | Matter sources of gauge thermodynamics | 26 Revtex pages, no figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A unified gauge approach to both, dynamics and thermodynamics involving
gravity, is developed from the local realization of the Poincar\'e group as a
particular instance of a spacetime group including translations. The formalism
is applied to study the physical features of the spherical non-rotating matter
source of ... | [
{
"created": "Tue, 29 May 2018 10:12:06 GMT",
"version": "v1"
}
] | 2018-05-30 | [
[
"Tresguerres",
"Romualdo",
""
]
] | A unified gauge approach to both, dynamics and thermodynamics involving gravity, is developed from the local realization of the Poincar\'e group as a particular instance of a spacetime group including translations. The formalism is applied to study the physical features of the spherical non-rotating matter source of an... |
1907.09676 | Yun Soo Myung | Yun Soo Myung, De-Cheng Zou | Black holes in new massive conformal gravity | 17 pages, 3 figures, title changed, version to appear in PRD | Phys. Rev. D 100, 064057 (2019) | 10.1103/PhysRevD.100.064057 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the black holes in the new massive conformal gravity which is
not invariant under conformal transformations because of the presence of the
Einstein-Hilbert term. First, we show that the small Schwarzschild black hole
is unstable against the $s$-mode of linearized Ricci tensor by solving the
Lichnerowic... | [
{
"created": "Tue, 23 Jul 2019 03:32:12 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Sep 2019 22:50:31 GMT",
"version": "v2"
}
] | 2019-10-02 | [
[
"Myung",
"Yun Soo",
""
],
[
"Zou",
"De-Cheng",
""
]
] | We investigate the black holes in the new massive conformal gravity which is not invariant under conformal transformations because of the presence of the Einstein-Hilbert term. First, we show that the small Schwarzschild black hole is unstable against the $s$-mode of linearized Ricci tensor by solving the Lichnerowicz-... |
1105.0345 | Recai Erdem | Recai Erdem | A simple toy model for a unified picture of dark energy, dark matter,
and inflation | 25 pages. The model is given in 3 pages. The rest is compatibility
check with observations and supplementary material | null | null | IZTECH-P2011-03 | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A specific scale factor in Robertson-Walker metric with the prospect of
giving the overall cosmic history in a unified picture roughly is considered.
The corresponding energy-momentum tensor is identified as that of two scalar
fields where one plays the roles of both inflaton and dark matter while the
other accounts ... | [
{
"created": "Mon, 2 May 2011 14:41:04 GMT",
"version": "v1"
}
] | 2011-05-05 | [
[
"Erdem",
"Recai",
""
]
] | A specific scale factor in Robertson-Walker metric with the prospect of giving the overall cosmic history in a unified picture roughly is considered. The corresponding energy-momentum tensor is identified as that of two scalar fields where one plays the roles of both inflaton and dark matter while the other accounts fo... |
1609.07125 | Abhishek Majhi | Abhishek Majhi | Proof of Bekenstein-Mukhanov ansatz in loop quantum gravity | 5 pages, close to published version | Mod. Phys. Lett. A, Vol. 31, No. 31 (2016) 1650171 | 10.1142/S0217732316501716 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A simple proof of Bekenstein-Mukhanov(BM) ansatz is given within the loop
quantum gravity(LQG) framework. The macroscopic area of an equilibrium black
hole horizon indeed manifests a linear quantization. The quantum number
responsible for this discreteness of the macroscopic area has a physical
meaning in the LQG fra... | [
{
"created": "Thu, 22 Sep 2016 19:39:13 GMT",
"version": "v1"
}
] | 2016-09-23 | [
[
"Majhi",
"Abhishek",
""
]
] | A simple proof of Bekenstein-Mukhanov(BM) ansatz is given within the loop quantum gravity(LQG) framework. The macroscopic area of an equilibrium black hole horizon indeed manifests a linear quantization. The quantum number responsible for this discreteness of the macroscopic area has a physical meaning in the LQG frame... |
2403.18752 | Leonardo Mastrototaro | A. Campitelli, L. Mastrototaro | Neutron Stars Mass-Radius relations analysis in the Quintessence
scenario | 5 pages, 2 figures | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we explore the effects of General Relativity modification on
the Mass-Radius relations of Neutron Stars induced by the presence of the
Quintessence field. We consider, in particular, the Kiselev model, according to
which the Quintessence field, being present in the entire Universe, might also
be presen... | [
{
"created": "Wed, 27 Mar 2024 16:52:53 GMT",
"version": "v1"
}
] | 2024-03-28 | [
[
"Campitelli",
"A.",
""
],
[
"Mastrototaro",
"L.",
""
]
] | In this paper, we explore the effects of General Relativity modification on the Mass-Radius relations of Neutron Stars induced by the presence of the Quintessence field. We consider, in particular, the Kiselev model, according to which the Quintessence field, being present in the entire Universe, might also be present ... |
gr-qc/0002033 | Esposito Giampiero | Giampiero Esposito | A Theory of Quantum Gravity from First Principles | 15 pages, plain Tex. In the revised version, the part after Eq. (38)
is completely new | null | null | DSF preprint 2000/3 | gr-qc | null | When quantum fields are studied on manifolds with boundary, the corresponding
one-loop quantum theory for bosonic gauge fields with linear covariant gauges
needs the assignment of suitable boundary conditions for elliptic differential
operators of Laplace type. There are however deep reasons to modify such a
scheme a... | [
{
"created": "Tue, 8 Feb 2000 06:43:02 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Apr 2000 08:22:47 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Esposito",
"Giampiero",
""
]
] | When quantum fields are studied on manifolds with boundary, the corresponding one-loop quantum theory for bosonic gauge fields with linear covariant gauges needs the assignment of suitable boundary conditions for elliptic differential operators of Laplace type. There are however deep reasons to modify such a scheme and... |
1705.01597 | Aurelien Barrau | Aur\'elien Barrau | Testing different approaches to quantum gravity with cosmology: An
overview | Invited introductory article for a special issue of Comptes Rendus
Physique | null | 10.1016/j.crhy.2017.05.001 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Among the available quantum gravity proposals, string theory, loop quantum
gravity, non-commutative geometry, group field theory, causal sets, asymptotic
safety, causal dynamical triangulation, emergent gravity are among the best
motivated models. As an introductory summary to this special issue of Comptes
Rendus Phy... | [
{
"created": "Wed, 3 May 2017 19:50:08 GMT",
"version": "v1"
}
] | 2017-06-28 | [
[
"Barrau",
"Aurélien",
""
]
] | Among the available quantum gravity proposals, string theory, loop quantum gravity, non-commutative geometry, group field theory, causal sets, asymptotic safety, causal dynamical triangulation, emergent gravity are among the best motivated models. As an introductory summary to this special issue of Comptes Rendus Physi... |
gr-qc/0003055 | Benedetti Riccardo | Riccardo Benedetti and Enore Guadagnini | Cosmological Time in (2+1) - Gravity | Totally new version with strongly improved exposition. Clarifying
examples and figures have been included. 21 pages, Latex, 9 figures | Nucl.Phys. B613 (2001) 330-352 | 10.1016/S0550-3213(01)00386-8 | null | gr-qc | null | We consider maximal globally hyperbolic flat (2+1) spacetimes with compact
space S of genus g>1. For any spacetime M of this type, the length of time that
the events have been in existence is M defines a global time, called the
cosmological time CT of M, which reveals deep intrinsic properties of
spacetime. In partic... | [
{
"created": "Tue, 14 Mar 2000 13:30:03 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Apr 2001 09:14:52 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Benedetti",
"Riccardo",
""
],
[
"Guadagnini",
"Enore",
""
]
] | We consider maximal globally hyperbolic flat (2+1) spacetimes with compact space S of genus g>1. For any spacetime M of this type, the length of time that the events have been in existence is M defines a global time, called the cosmological time CT of M, which reveals deep intrinsic properties of spacetime. In particul... |
2408.05576 | Cosimo Bambi | Bakhtiyor Narzilloev, Ahmadjon Abdujabbarov, Bobomurat Ahmedov, Cosimo
Bambi | Observed jet power and radiative efficiency of black hole candidates in
Kerr + PFDM model | 13 pages, 9 figures. Accepted in EPJC. arXiv admin note: text overlap
with arXiv:2310.10554 | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this research, we explore the electromagnetic energy emitted by
astrophysical black holes within the Kerr+PFDM spacetime, a model encompassing
rotating black holes surrounded by dark matter. Our investigation focuses on
black holes within X-ray binary systems, namely GRS 1915+105, GRO J1655-40, XTE
J1550-564, A062... | [
{
"created": "Sat, 10 Aug 2024 14:59:54 GMT",
"version": "v1"
}
] | 2024-08-13 | [
[
"Narzilloev",
"Bakhtiyor",
""
],
[
"Abdujabbarov",
"Ahmadjon",
""
],
[
"Ahmedov",
"Bobomurat",
""
],
[
"Bambi",
"Cosimo",
""
]
] | In this research, we explore the electromagnetic energy emitted by astrophysical black holes within the Kerr+PFDM spacetime, a model encompassing rotating black holes surrounded by dark matter. Our investigation focuses on black holes within X-ray binary systems, namely GRS 1915+105, GRO J1655-40, XTE J1550-564, A0620-... |
1212.4730 | Richard Price | Richard H. Price, John W. Belcher, David A. Nichols | Comparison of electromagnetic and gravitational radiation; what we can
learn about each from the other | 22 pages, 7 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compare the nature of electromagnetic fields and of gravitational fields
in linearized general relativity. We carry out this comparison both
mathematically and visually. In particular the "lines of force" visualizations
of electromagnetism are contrasted with the recently introduced tendex/vortex
eigenline techniq... | [
{
"created": "Wed, 19 Dec 2012 16:43:15 GMT",
"version": "v1"
}
] | 2012-12-20 | [
[
"Price",
"Richard H.",
""
],
[
"Belcher",
"John W.",
""
],
[
"Nichols",
"David A.",
""
]
] | We compare the nature of electromagnetic fields and of gravitational fields in linearized general relativity. We carry out this comparison both mathematically and visually. In particular the "lines of force" visualizations of electromagnetism are contrasted with the recently introduced tendex/vortex eigenline technique... |
2103.05802 | Wan Cong Ms | Wan Cong, Jiri Bicak, David Kubiznak and Robert Mann | Quantum Detection of Conicity | 5+1 pages, 4 figures | Physics Letters B 820, 136482 (2021) | 10.1016/j.physletb.2021.136482 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the sensitivity of an Unruh-DeWitt detector to the global
features of a deficit angle that are otherwise classically inaccessible.
Specifically, we consider a detector placed inside an infinite thin hollow
cylinder whose spacetime is everywhere flat but outside of which the spacetime
has a deficit angl... | [
{
"created": "Wed, 10 Mar 2021 01:13:25 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Jul 2021 18:52:18 GMT",
"version": "v2"
}
] | 2021-07-06 | [
[
"Cong",
"Wan",
""
],
[
"Bicak",
"Jiri",
""
],
[
"Kubiznak",
"David",
""
],
[
"Mann",
"Robert",
""
]
] | We investigate the sensitivity of an Unruh-DeWitt detector to the global features of a deficit angle that are otherwise classically inaccessible. Specifically, we consider a detector placed inside an infinite thin hollow cylinder whose spacetime is everywhere flat but outside of which the spacetime has a deficit angle ... |
gr-qc/0403057 | Y. Jack Ng | Y. Jack Ng and H. van Dam | Spacetime Foam, Holographic Principle, and Black Hole Quantum Computers | 8 pages, LaTeX; Talk given by Jack Ng, in celebration of Paul
Frampton's 60th birthday, at the Coral Gables Conference (in Fort Lauderdale,
Florida on December 17, 2003). To appear in the Proceedings of the 2003 Coral
Gables Conference | Int.J.Mod.Phys. A20 (2005) 1328-1335 | 10.1142/S0217751X05024237 | null | gr-qc hep-th quant-ph | null | Spacetime foam, also known as quantum foam, has its origin in quantum
fluctuations of spacetime. Arguably it is the source of the holographic
principle, which severely limits how densely information can be packed in
space. Its physics is also intimately linked to that of black holes and
computation. In particular, th... | [
{
"created": "Sat, 13 Mar 2004 21:14:46 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Ng",
"Y. Jack",
""
],
[
"van Dam",
"H.",
""
]
] | Spacetime foam, also known as quantum foam, has its origin in quantum fluctuations of spacetime. Arguably it is the source of the holographic principle, which severely limits how densely information can be packed in space. Its physics is also intimately linked to that of black holes and computation. In particular, the ... |
gr-qc/0401127 | Simone Mercuri | Simone Mercuri, Giovanni Montani | On the Frame Fixing in Quantum Gravity | 3 pages, no figures, proceeding of the X Marcel Grossmann meeting,
Rio de Janeiro, Brazil, July 20-26, 2003 | null | 10.1142/9789812704030_0301 | null | gr-qc | null | We provide a discussion about the necessity to fix the reference frame before
quantizing the gravitational field. Our presentation is based on stressing how
the 3+1-slicing of the space time becomes an ambiguous procedure as referred to
a quantum 4-metric.
| [
{
"created": "Fri, 30 Jan 2004 15:20:37 GMT",
"version": "v1"
}
] | 2016-11-09 | [
[
"Mercuri",
"Simone",
""
],
[
"Montani",
"Giovanni",
""
]
] | We provide a discussion about the necessity to fix the reference frame before quantizing the gravitational field. Our presentation is based on stressing how the 3+1-slicing of the space time becomes an ambiguous procedure as referred to a quantum 4-metric. |
1501.03921 | Nahid Ahmadi | Nahid Ahmadi and Zainab Sedaghatmanesh | Deflection of light by the field of a binary system | 9 pages, 4 figures | Class. Quantum Grav. 32 (2015) 235015 (20pp) | 10.1088/0264-9381/32/23/235015 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the motion of a photon in the gravitational field of a binary
system. The equations of motion are geodesic equations in a Schwarzchild
background with a tidal force. We specialize the equations to that of an
edge-on binary and use the method of osculating elements to integrate them.
This work helps to iden... | [
{
"created": "Fri, 16 Jan 2015 09:10:53 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Apr 2015 14:54:15 GMT",
"version": "v2"
}
] | 2021-08-31 | [
[
"Ahmadi",
"Nahid",
""
],
[
"Sedaghatmanesh",
"Zainab",
""
]
] | We examine the motion of a photon in the gravitational field of a binary system. The equations of motion are geodesic equations in a Schwarzchild background with a tidal force. We specialize the equations to that of an edge-on binary and use the method of osculating elements to integrate them. This work helps to identi... |
2101.03167 | Ellery Ames | Ellery Ames, Florian Beyer, James Isenberg and Todd Oliynyk | Stability of AVTD Behavior within the Polarized $T^2$-symmetric vacuum
spacetimes | 28 pages. Fixed minor typos and made several clarifications. Agrees
with published version | Ann. Henri Poincar\'e (2022) | 10.1007/s00023-021-01142-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove stability of the family of Kasner solutions within the class of
polarized $T^2$-symmetric solutions of the vacuum Einstein equations in the
contracting time direction with respect to an areal time foliation. All Kasner
solutions for which the asymptotic velocity parameter $K$ satisfies $|K-1|>2$
are non-line... | [
{
"created": "Fri, 8 Jan 2021 18:57:19 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Feb 2021 03:27:45 GMT",
"version": "v2"
},
{
"created": "Tue, 25 Jan 2022 21:59:38 GMT",
"version": "v3"
}
] | 2022-05-20 | [
[
"Ames",
"Ellery",
""
],
[
"Beyer",
"Florian",
""
],
[
"Isenberg",
"James",
""
],
[
"Oliynyk",
"Todd",
""
]
] | We prove stability of the family of Kasner solutions within the class of polarized $T^2$-symmetric solutions of the vacuum Einstein equations in the contracting time direction with respect to an areal time foliation. All Kasner solutions for which the asymptotic velocity parameter $K$ satisfies $|K-1|>2$ are non-linear... |
2404.08732 | Jose Natario | Lu\'is Machado, Jos\'e Nat\'ario, Jorge Drumond Silva | Free-falling motion of an elastic rigid rod towards a Schwarzschild
black hole | 10 pages, 5 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study the motion of an elastic rigid rod which is radially free-falling
towards a Schwarzschild black hole. This is accomplished by reducing the
corresponding free-boundary PDE problem to a sequence of ODEs, which we
integrate numerically. Starting with a rod at rest, we show that it is possible
to choose its init... | [
{
"created": "Fri, 12 Apr 2024 18:00:02 GMT",
"version": "v1"
}
] | 2024-04-16 | [
[
"Machado",
"Luís",
""
],
[
"Natário",
"José",
""
],
[
"Silva",
"Jorge Drumond",
""
]
] | We study the motion of an elastic rigid rod which is radially free-falling towards a Schwarzschild black hole. This is accomplished by reducing the corresponding free-boundary PDE problem to a sequence of ODEs, which we integrate numerically. Starting with a rod at rest, we show that it is possible to choose its initia... |
2308.03192 | Yurii Ignat'ev | Yu. G. Ignat'ev | Formation of supermassive nuclei of Black holes in the early Universe by
the mechanism of scalar-gravitational instability. I. Local picture | 19 pages,18 figures, 34 references | Gravit. Cosmol. 2023, 29, 327 | 10.1134/S0202289323040102 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on the formulated and proven similarity properties of cosmological
models based on a statistical system of degenerate scalarly charged fermions,
as well as the previously identified mechanism of scalar-gravitational
instability of cosmological models, a numerical-analytical study of the
formation of supermassiv... | [
{
"created": "Sun, 6 Aug 2023 18:55:07 GMT",
"version": "v1"
}
] | 2023-12-04 | [
[
"Ignat'ev",
"Yu. G.",
""
]
] | Based on the formulated and proven similarity properties of cosmological models based on a statistical system of degenerate scalarly charged fermions, as well as the previously identified mechanism of scalar-gravitational instability of cosmological models, a numerical-analytical study of the formation of supermassive ... |
1407.8545 | Charles Suggs | R. Jackiw and So-Young Pi | Fake Conformal Symmetry in Conformal Cosmological Models | References updated, errors corrected, published in Phys. Rev. D. 4
pages, RevTeX, no figures | Phys. Rev. D 91, 067501 (2015) | 10.1103/PhysRevD.91.067501 | MIT-CTP/4570 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the local conformal invariance (Weyl invariance) in tensor-scalar
theories used in recently proposed conformal cosmological models. We show that
the Noether currents associated with Weyl invariance in these theories vanish.
We assert that the corresponding Weyl symmetry does not have any dynamical
role.
| [
{
"created": "Thu, 31 Jul 2014 19:49:33 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Oct 2014 18:33:03 GMT",
"version": "v2"
},
{
"created": "Tue, 24 Feb 2015 17:52:31 GMT",
"version": "v3"
}
] | 2015-03-18 | [
[
"Jackiw",
"R.",
""
],
[
"Pi",
"So-Young",
""
]
] | We examine the local conformal invariance (Weyl invariance) in tensor-scalar theories used in recently proposed conformal cosmological models. We show that the Noether currents associated with Weyl invariance in these theories vanish. We assert that the corresponding Weyl symmetry does not have any dynamical role. |
0805.4046 | HongSheng Zhao | HongSheng Zhao (U. of St Andrews) | Reinterpreting MOND: coupling of Einsteinian gravity and spin of cosmic
neutrinos? | 8p, some changes of notations, references added | null | null | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several rare coincidences of scales in standard particle physics are needed
to explain (i) why neutrinos have mass, (ii) why the negative pressure of the
cosmological dark energy (DE) coincides with the positive pressure of random
motion of dark matter (DM) in bright galaxies, (iii) why Dark Matter in
galaxies seems ... | [
{
"created": "Tue, 27 May 2008 03:44:40 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Jun 2008 16:50:33 GMT",
"version": "v2"
}
] | 2008-06-11 | [
[
"Zhao",
"HongSheng",
"",
"U. of St Andrews"
]
] | Several rare coincidences of scales in standard particle physics are needed to explain (i) why neutrinos have mass, (ii) why the negative pressure of the cosmological dark energy (DE) coincides with the positive pressure of random motion of dark matter (DM) in bright galaxies, (iii) why Dark Matter in galaxies seems to... |
2012.05178 | Burkhard Kleihaus | Rustam Ibadov, Burkhard Kleihaus, Jutta Kunz, Sardor Murodov | Scalarized nutty wormholes | 14 pages, 4 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct scalarized wormholes with a NUT charge in higher curvature
theories. We consider both Einstein-scalar-Gauss-Bonnet and
Einstein-scalar-Chern-Simons theories, following a recent paper by Brihaye et
al. [1], where spontaneously scalarised Schwarzschild-NUT solutions were
studied. By varying the coupling pa... | [
{
"created": "Wed, 9 Dec 2020 17:06:19 GMT",
"version": "v1"
}
] | 2020-12-10 | [
[
"Ibadov",
"Rustam",
""
],
[
"Kleihaus",
"Burkhard",
""
],
[
"Kunz",
"Jutta",
""
],
[
"Murodov",
"Sardor",
""
]
] | We construct scalarized wormholes with a NUT charge in higher curvature theories. We consider both Einstein-scalar-Gauss-Bonnet and Einstein-scalar-Chern-Simons theories, following a recent paper by Brihaye et al. [1], where spontaneously scalarised Schwarzschild-NUT solutions were studied. By varying the coupling para... |
2309.13931 | Conghua Liu | Conghua Liu, Ran Li, Kun Zhang and Jin Wang | Generalized free energy and dynamical state transition of the dyonic AdS
black hole in the grand canonical ensemble | null | JHEP11(2023)068 | 10.1007/JHEP11(2023)068 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the generalized free energy of the dyonic AdS black hole in an
ensemble with varying electric charge $q_E$ and fixed magnetic charge $q_M$.
When we adjust the temperature $T$ and the electric potential $\Phi_E$ of the
ensemble, the Ricci scalar curvature $R$ and electromagnetic potential $A_u$
usually diverg... | [
{
"created": "Mon, 25 Sep 2023 08:01:23 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Nov 2023 07:39:43 GMT",
"version": "v2"
}
] | 2023-11-15 | [
[
"Liu",
"Conghua",
""
],
[
"Li",
"Ran",
""
],
[
"Zhang",
"Kun",
""
],
[
"Wang",
"Jin",
""
]
] | We study the generalized free energy of the dyonic AdS black hole in an ensemble with varying electric charge $q_E$ and fixed magnetic charge $q_M$. When we adjust the temperature $T$ and the electric potential $\Phi_E$ of the ensemble, the Ricci scalar curvature $R$ and electromagnetic potential $A_u$ usually diverge ... |
2006.01883 | Javier Olmedo | Ivan Agullo, Javier Olmedo and V. Sreenath | Observational consequences of Bianchi I spacetimes in loop quantum
cosmology | 37 pages, 12 figures, version matching published manuscript | Phys. Rev. D 102, 043523 (2020) | 10.1103/PhysRevD.102.043523 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Anisotropies generically dominate the earliest stages of expansion of a
homogeneous universe. They are particularly relevant in bouncing models, since
shears grow in the contracting phase of the cosmos, making the isotropic
situation unstable. This paper extends the study of cosmological perturbations
in loop quantum... | [
{
"created": "Tue, 2 Jun 2020 19:02:28 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Sep 2020 08:09:42 GMT",
"version": "v2"
}
] | 2020-09-04 | [
[
"Agullo",
"Ivan",
""
],
[
"Olmedo",
"Javier",
""
],
[
"Sreenath",
"V.",
""
]
] | Anisotropies generically dominate the earliest stages of expansion of a homogeneous universe. They are particularly relevant in bouncing models, since shears grow in the contracting phase of the cosmos, making the isotropic situation unstable. This paper extends the study of cosmological perturbations in loop quantum c... |
1310.2957 | Sebastian Steinhaus | Wojciech Kaminski and Sebastian Steinhaus | The Barrett-Crane model: asymptotic measure factor | 12 pages, clarifications and references added, version accepted in
Class. Quant. Grav | Class. Quantum Grav. 31 (2014) 075014 | 10.1088/0264-9381/31/7/075014 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The original spin foam model construction for 4D gravity by Barrett and Crane
suffers from a few troubling issues. In the simple examples of the vertex
amplitude they can be summarized as the existence of contributions to the
asymptotics from non geometric configurations. Even restricted to geometric
contributions th... | [
{
"created": "Thu, 10 Oct 2013 20:28:06 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Oct 2013 22:36:41 GMT",
"version": "v2"
},
{
"created": "Sun, 23 Feb 2014 18:48:48 GMT",
"version": "v3"
}
] | 2014-03-12 | [
[
"Kaminski",
"Wojciech",
""
],
[
"Steinhaus",
"Sebastian",
""
]
] | The original spin foam model construction for 4D gravity by Barrett and Crane suffers from a few troubling issues. In the simple examples of the vertex amplitude they can be summarized as the existence of contributions to the asymptotics from non geometric configurations. Even restricted to geometric contributions the ... |
2308.01233 | Martiros Khurshudyan | Martiros Khurshudyan | Swampland criteria and neutrino generation in a non-cold dark matter
universe | accepted in Astrophysics (Astrofizika) | null | null | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | In this paper, the implications of string Swampland criteria for a dark
energy-dominated universe, where we have a deviation from the cold dark matter
model, will be discussed. In particular, we have considered two models. One of
them is one parameter model, while the second one has been crafted to reveal
the dynamic... | [
{
"created": "Wed, 2 Aug 2023 15:40:29 GMT",
"version": "v1"
}
] | 2023-08-03 | [
[
"Khurshudyan",
"Martiros",
""
]
] | In this paper, the implications of string Swampland criteria for a dark energy-dominated universe, where we have a deviation from the cold dark matter model, will be discussed. In particular, we have considered two models. One of them is one parameter model, while the second one has been crafted to reveal the dynamics ... |
1910.03933 | David Benisty | Shreya Banerjee, David Benisty and Eduardo I. Guendelman | Running Dark Energy and Dark Matter from Dynamical Spacetime | 6 pages, 4 figures, modified version | Bulg.J.Phys. 48 (2021) no.2, 117-137 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Running Dark Energy and Dark Matter models are candidates to resolve the
Hubble constant tension. However the model does not consider a Lagrangian
formulation directly. In this paper we formulate an action principle where the
Running Vacuum Model (RVM) is obtained from an action principle, with a scalar
field model f... | [
{
"created": "Tue, 8 Oct 2019 06:08:17 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Apr 2020 18:39:38 GMT",
"version": "v2"
},
{
"created": "Fri, 23 Apr 2021 14:44:14 GMT",
"version": "v3"
}
] | 2021-04-26 | [
[
"Banerjee",
"Shreya",
""
],
[
"Benisty",
"David",
""
],
[
"Guendelman",
"Eduardo I.",
""
]
] | Running Dark Energy and Dark Matter models are candidates to resolve the Hubble constant tension. However the model does not consider a Lagrangian formulation directly. In this paper we formulate an action principle where the Running Vacuum Model (RVM) is obtained from an action principle, with a scalar field model for... |
gr-qc/0104049 | Roy Maartens | Roy Maartens (Portsmouth), Bahram Mashhoon (Missouri-Columbia), David
Matravers (Portsmouth) | Holonomy and gravitomagnetism | 6 pages Latex (IOP style); new results covering stationary
axisymmetric spacetimes; version accepted for Class. Quant. Grav | Class.Quant.Grav. 19 (2002) 195-202 | 10.1088/0264-9381/19/2/301 | null | gr-qc | null | We analyze parallel transport of a vector field around an equatorial orbit in
Kerr and stationary axisymmetric spacetimes that are reflection symmetric about
their equatorial planes. As in Schwarzschild spacetime, there is a band
structure of holonomy invariance. The new feature introduced by rotation is a
shift in t... | [
{
"created": "Tue, 17 Apr 2001 08:15:23 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Nov 2001 11:01:34 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Maartens",
"Roy",
"",
"Portsmouth"
],
[
"Mashhoon",
"Bahram",
"",
"Missouri-Columbia"
],
[
"Matravers",
"David",
"",
"Portsmouth"
]
] | We analyze parallel transport of a vector field around an equatorial orbit in Kerr and stationary axisymmetric spacetimes that are reflection symmetric about their equatorial planes. As in Schwarzschild spacetime, there is a band structure of holonomy invariance. The new feature introduced by rotation is a shift in the... |
gr-qc/9712006 | Michele Maggiore | Stefano Foffa and Michele Maggiore | Anisotropic String Cosmology at Large Curvatures | 16 pages, Latex, 2 figures | Phys.Rev. D58 (1998) 023505 | 10.1103/PhysRevD.58.023505 | IFUP-TH/53-97 | gr-qc | null | We study the effect of the antisymmetric tensor field $B_{\mu\nu}$ on the
large curvature phase of string cosmology. It is well-known that a
non-vanishing value of $H=dB$ leads to an anisotropic expansion of the spatial
dimensions. Correspondingly, in the string phase of the model, including
$\alpha '$ corrections, w... | [
{
"created": "Mon, 1 Dec 1997 12:14:12 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Foffa",
"Stefano",
""
],
[
"Maggiore",
"Michele",
""
]
] | We study the effect of the antisymmetric tensor field $B_{\mu\nu}$ on the large curvature phase of string cosmology. It is well-known that a non-vanishing value of $H=dB$ leads to an anisotropic expansion of the spatial dimensions. Correspondingly, in the string phase of the model, including $\alpha '$ corrections, we ... |
2201.12210 | Surajit Kalita | Surajit Kalita and Lupamudra Sarmah | Weak-field limit of $f(R)$ gravity to unify peculiar white dwarfs | 10 pages with 1 figure; accepted for publication in Physics Letters B | PLB 827 (2022) 136942 | 10.1016/j.physletb.2022.136942 | null | gr-qc astro-ph.HE astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In recent years, the idea of sub- and super-Chandrasekhar limiting mass white
dwarfs (WDs), which are potential candidates to produce under- and
over-luminous type Ia supernovae, respectively, has been a key interest in the
scientific community. Although researchers have proposed different models to
explain these pec... | [
{
"created": "Fri, 28 Jan 2022 16:08:52 GMT",
"version": "v1"
}
] | 2022-02-04 | [
[
"Kalita",
"Surajit",
""
],
[
"Sarmah",
"Lupamudra",
""
]
] | In recent years, the idea of sub- and super-Chandrasekhar limiting mass white dwarfs (WDs), which are potential candidates to produce under- and over-luminous type Ia supernovae, respectively, has been a key interest in the scientific community. Although researchers have proposed different models to explain these pecul... |
2103.13203 | Shibendu Gupta Choudhury | Shibendu Gupta Choudhury, Ananda Dasgupta and Narayan Banerjee | The Raychaudhuri equation for a quantized timelike geodesic congruence | 14 pages, major changes, version accepted for publication in EPJC | Eur. Phys. J. C 81, 906 (2021) | 10.1140/epjc/s10052-021-09714-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recent attempt to arrive at a quantum version of Raychaudhuri's equation is
looked at critically. It is shown that the method, and even the idea, has some
inherent problems. The issues are pointed out here. We have also shown that it
is possible to salvage the method in some limited domain of applicability.
Althoug... | [
{
"created": "Wed, 24 Mar 2021 14:04:00 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Oct 2021 13:22:53 GMT",
"version": "v2"
}
] | 2021-10-19 | [
[
"Choudhury",
"Shibendu Gupta",
""
],
[
"Dasgupta",
"Ananda",
""
],
[
"Banerjee",
"Narayan",
""
]
] | A recent attempt to arrive at a quantum version of Raychaudhuri's equation is looked at critically. It is shown that the method, and even the idea, has some inherent problems. The issues are pointed out here. We have also shown that it is possible to salvage the method in some limited domain of applicability. Although ... |
0911.4417 | Sergio Zerbini | S. A. Hayward, R. Di Criscienzo, M. Nadalini, L. Vanzo, S. Zerbini | Comment on "On the tunneling through the black hole horizon"
[arXiv:0910.3934] | latex file, 1 figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The arguments of the above article [arXiv:0910.3934] do not apply to the
papers which it criticizes, and contain several key errors, including a
fundamental misunderstanding about the equivalence principle.
| [
{
"created": "Mon, 23 Nov 2009 14:38:10 GMT",
"version": "v1"
}
] | 2009-11-24 | [
[
"Hayward",
"S. A.",
""
],
[
"Di Criscienzo",
"R.",
""
],
[
"Nadalini",
"M.",
""
],
[
"Vanzo",
"L.",
""
],
[
"Zerbini",
"S.",
""
]
] | The arguments of the above article [arXiv:0910.3934] do not apply to the papers which it criticizes, and contain several key errors, including a fundamental misunderstanding about the equivalence principle. |
2308.00371 | Chopin Soo | Chopin Soo | Cosmic time and the initial state of the universe | 17 pages, 2 appendices | Universe, 2023, Volume 9, Issue 12, 489 | 10.3390/universe9120489 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The exact solution of the Hamiltonian constraint in canonical gravity and the
resultant reduction of Einstein's theory reveal the synergy between gravitation
and the intrinsic cosmic clock of our expanding universe. Intrinsic Time
Geometrodynamics advocates a paradigm shift from four covariances to just
spatial diffe... | [
{
"created": "Tue, 1 Aug 2023 08:27:02 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Nov 2023 07:25:45 GMT",
"version": "v2"
}
] | 2023-11-27 | [
[
"Soo",
"Chopin",
""
]
] | The exact solution of the Hamiltonian constraint in canonical gravity and the resultant reduction of Einstein's theory reveal the synergy between gravitation and the intrinsic cosmic clock of our expanding universe. Intrinsic Time Geometrodynamics advocates a paradigm shift from four covariances to just spatial diffeom... |
gr-qc/0007065 | Pedro Gonzalez | Pedro F. Gonzalez-Diaz (IMAFF, Csic) | Kinks, energy conditions and closed timelike curves | 11 pages, LaTex, 1 figure, to appear in IJMPD | Int.J.Mod.Phys. D9 (2000) 531-541 | 10.1142/S0218271800000475 | IMAFF-RCA-00-07 | gr-qc | null | A link between the possibility of extending a geodessically incomplete kinked
spacetime to a spacetime which is geodesically complete and the energy
conditions is discussed for the case of a cylindrically-symmetric spacetime
kink. It is concluded that neither the strong nor the weak energy condition can
be satisfied ... | [
{
"created": "Mon, 24 Jul 2000 15:27:11 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Gonzalez-Diaz",
"Pedro F.",
"",
"IMAFF, Csic"
]
] | A link between the possibility of extending a geodessically incomplete kinked spacetime to a spacetime which is geodesically complete and the energy conditions is discussed for the case of a cylindrically-symmetric spacetime kink. It is concluded that neither the strong nor the weak energy condition can be satisfied in... |
gr-qc/0009044 | Pedro Marronetti | Pedro Marronetti and Richard A. Matzner | Solving the Initial Value Problem of two Black Holes | 4 pages, 3 figures. Minor corrections, some points clarified, and one
reference added. To appear in Phys. Rev. Lett | Phys.Rev.Lett.85:5500-5503,2000 | 10.1103/PhysRevLett.85.5500 | null | gr-qc astro-ph | null | We solve the elliptic equations associated with the Hamiltonian and momentum
constraints, corresponding to a system composed of two black holes with
arbitrary linear and angular momentum. These new solutions are based on a
Kerr-Schild spacetime slicing which provides more physically realistic
solutions than the initi... | [
{
"created": "Wed, 13 Sep 2000 17:17:38 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Nov 2000 14:39:49 GMT",
"version": "v2"
},
{
"created": "Thu, 30 Nov 2000 22:56:26 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Marronetti",
"Pedro",
""
],
[
"Matzner",
"Richard A.",
""
]
] | We solve the elliptic equations associated with the Hamiltonian and momentum constraints, corresponding to a system composed of two black holes with arbitrary linear and angular momentum. These new solutions are based on a Kerr-Schild spacetime slicing which provides more physically realistic solutions than the initial... |
2402.16250 | Xinliang An | Xinliang An, Hong Kiat Tan | A Proof of Weak Cosmic Censorship Conjecture for the Spherically
Symmetric Einstein-Maxwell-Charged Scalar Field System | 148 pages | null | null | null | gr-qc math-ph math.AP math.DG math.MP | http://creativecommons.org/licenses/by-sa/4.0/ | Under spherical symmetry, we show that the weak cosmic censorship holds for
the gravitational collapse of the Einstein-Maxwell-charged scalar field system.
Namely, for this system, with generic initial data, the formed spacetime
singularities are concealed inside black-hole regions. This generalizes
Christodoulou's c... | [
{
"created": "Mon, 26 Feb 2024 02:28:36 GMT",
"version": "v1"
}
] | 2024-02-27 | [
[
"An",
"Xinliang",
""
],
[
"Tan",
"Hong Kiat",
""
]
] | Under spherical symmetry, we show that the weak cosmic censorship holds for the gravitational collapse of the Einstein-Maxwell-charged scalar field system. Namely, for this system, with generic initial data, the formed spacetime singularities are concealed inside black-hole regions. This generalizes Christodoulou's cel... |
0710.3880 | Jorge P\'aramos | J. Paramos and O. Bertolami | Galileo satellite constellation and extensions to General Relativity | Based on talk presented by one of us (J.P.) at the 1st. Colloquium
"Scientific and Fundamental Aspects of the Galileo Programme", Toulouse,
France, 1-4 October 2007. To be published in the Proceedings of the
Colloquium | null | null | null | gr-qc | null | We consider the impact of some known extensions of General Relativity in
observables that will be available with the Galileo positioning systems, and
draw conclusions as to the possibility of measuring them. We specifically
address the effects of the presence of a cosmological constant, a Yukawa-like
addition to the ... | [
{
"created": "Sat, 20 Oct 2007 22:07:06 GMT",
"version": "v1"
}
] | 2007-10-23 | [
[
"Paramos",
"J.",
""
],
[
"Bertolami",
"O.",
""
]
] | We consider the impact of some known extensions of General Relativity in observables that will be available with the Galileo positioning systems, and draw conclusions as to the possibility of measuring them. We specifically address the effects of the presence of a cosmological constant, a Yukawa-like addition to the Ne... |
2307.03011 | Robie Hennigar | Masaya Amo, Antonia M. Frassino, Robie A. Hennigar | Entropy Bounds for Rotating AdS Black Holes | 14 pages, 1 figure; v2: updated to match published version | null | 10.1103/PhysRevLett.131.241401 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose novel thermodynamic inequalities that apply to stationary
asymptotically Anti-de Sitter (AdS) black holes. These inequalities incorporate
the thermodynamic volume and refine the reverse isoperimetric inequality. To
assess the validity of our conjectures, we apply them to a wide range of
analytical black ho... | [
{
"created": "Thu, 6 Jul 2023 14:20:31 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Dec 2023 14:28:24 GMT",
"version": "v2"
}
] | 2023-12-13 | [
[
"Amo",
"Masaya",
""
],
[
"Frassino",
"Antonia M.",
""
],
[
"Hennigar",
"Robie A.",
""
]
] | We propose novel thermodynamic inequalities that apply to stationary asymptotically Anti-de Sitter (AdS) black holes. These inequalities incorporate the thermodynamic volume and refine the reverse isoperimetric inequality. To assess the validity of our conjectures, we apply them to a wide range of analytical black hole... |
1806.07134 | Jean-Luc Lehners | Alice Di Tucci and Jean-Luc Lehners | Unstable no-boundary fluctuations from sums over regular metrics | 22 pages, 8 figures | Phys. Rev. D 98, 103506 (2018) | 10.1103/PhysRevD.98.103506 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It was recently shown by Feldbrugge et al. that the no-boundary proposal,
defined via a Lorentzian path integral and in minisuperspace, leads to unstable
fluctuations, in disagreement with early universe observations. In these
calculations many off-shell geometries summed over in the path integral in fact
contain sin... | [
{
"created": "Tue, 19 Jun 2018 09:51:30 GMT",
"version": "v1"
}
] | 2018-11-14 | [
[
"Di Tucci",
"Alice",
""
],
[
"Lehners",
"Jean-Luc",
""
]
] | It was recently shown by Feldbrugge et al. that the no-boundary proposal, defined via a Lorentzian path integral and in minisuperspace, leads to unstable fluctuations, in disagreement with early universe observations. In these calculations many off-shell geometries summed over in the path integral in fact contain singu... |
0711.1868 | Nicolas Yunes | Daniel Grumiller (MIT), Nicolas Yunes (Penn State) | How do Black Holes Spin in Chern-Simons Modified Gravity? | 20 pages, 1 figure. Submitted to PRD | Phys.Rev.D77:044015,2008 | 10.1103/PhysRevD.77.044015 | IGC-07/11-1, MIT-CTP 3908 | gr-qc hep-th | null | No Kerr-like exact solution has yet been found in Chern-Simons modified
gravity. Intrigued by this absence, we study stationary and axisymmetric
metrics that could represent the exterior field of spinning black holes. For
the standard choice of the background scalar, the modified field equations
decouple into the Ein... | [
{
"created": "Tue, 13 Nov 2007 16:05:48 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Grumiller",
"Daniel",
"",
"MIT"
],
[
"Yunes",
"Nicolas",
"",
"Penn State"
]
] | No Kerr-like exact solution has yet been found in Chern-Simons modified gravity. Intrigued by this absence, we study stationary and axisymmetric metrics that could represent the exterior field of spinning black holes. For the standard choice of the background scalar, the modified field equations decouple into the Einst... |
1907.03897 | Zack Carson | Zack Carson, Brian C. Seymour, Kent Yagi | Future Prospects for Probing Scalar-Tensor Theories with Gravitational
Waves from Mixed Binaries | 8 pages, 8 figures; updated to match with the version published in
CQG | null | 10.1088/1361-6382/ab6a1f | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The extreme-gravity collisions of binaries with one black hole and one
neutron star provide for excellent tests of general relativity. We here study
how well one can constrain theories beyond general relativity with additional
scalar fields that allow for spontaneous scalarization of neutron stars, and
those motivate... | [
{
"created": "Mon, 8 Jul 2019 22:33:02 GMT",
"version": "v1"
},
{
"created": "Sat, 11 Jan 2020 03:07:07 GMT",
"version": "v2"
},
{
"created": "Fri, 17 Jan 2020 17:10:49 GMT",
"version": "v3"
},
{
"created": "Mon, 20 Jan 2020 16:39:53 GMT",
"version": "v4"
}
] | 2020-04-08 | [
[
"Carson",
"Zack",
""
],
[
"Seymour",
"Brian C.",
""
],
[
"Yagi",
"Kent",
""
]
] | The extreme-gravity collisions of binaries with one black hole and one neutron star provide for excellent tests of general relativity. We here study how well one can constrain theories beyond general relativity with additional scalar fields that allow for spontaneous scalarization of neutron stars, and those motivated ... |
2308.11886 | Shao-Wen Wei | Shao-Wen Wei, Yu-Xiao Liu | Thermodynamic Nature of Black Holes in Coexistence Region | 5 pages, 5 figures | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Studying the system state of coexistence regions has important applications
in revealing detailed microscopic interactions between different phases.
However, the thermodynamic nature in the coexistence black hole regions has
been neglected in previous studies. In this work, we introduce two new ratio
parameters to in... | [
{
"created": "Wed, 23 Aug 2023 03:19:43 GMT",
"version": "v1"
}
] | 2023-08-24 | [
[
"Wei",
"Shao-Wen",
""
],
[
"Liu",
"Yu-Xiao",
""
]
] | Studying the system state of coexistence regions has important applications in revealing detailed microscopic interactions between different phases. However, the thermodynamic nature in the coexistence black hole regions has been neglected in previous studies. In this work, we introduce two new ratio parameters to inve... |
2107.12776 | Gamal G.L. Nashed | G.G.L. Nashed and K. Bamba | Black holes solutions in power-law Maxwell-$f(T)$ gravity in diverse
dimensions | 17 pages, 6 figures, Accepted for publication in Physics of the Dark
Universe | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We investigate the solutions of black holes in $f(T)$ gravity with nonlinear
power-law Maxwell field, where $T$ is the torsion scalar in teleparalelism. In
particular, we introduce the Langranian with diverse dimensions in which the
quadratic polynomial form of $f(T)$ couples with the nonlinear power-law
Maxwell fiel... | [
{
"created": "Sun, 25 Jul 2021 08:57:33 GMT",
"version": "v1"
}
] | 2021-07-28 | [
[
"Nashed",
"G. G. L.",
""
],
[
"Bamba",
"K.",
""
]
] | We investigate the solutions of black holes in $f(T)$ gravity with nonlinear power-law Maxwell field, where $T$ is the torsion scalar in teleparalelism. In particular, we introduce the Langranian with diverse dimensions in which the quadratic polynomial form of $f(T)$ couples with the nonlinear power-law Maxwell field.... |
2003.11095 | Marc Schneider | Cecilia Giavoni and Marc Schneider | Quantum effects across dynamical horizons | 24 pages, journal version | Class. Quantum Grav. 37 (2020) 215020 | 10.1088/1361-6382/abb576 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a generalization of the Hawking effect for dynamical trapping
horizons by calculating the tunneling rate in the Hamilton-Jacobi formalism. It
turns out that all horizons classified by Hayward are subjected to thermal
quantum effects. While the Hawking effect for future outer and past inner
trapping horizon... | [
{
"created": "Tue, 24 Mar 2020 20:00:01 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Oct 2020 10:24:27 GMT",
"version": "v2"
}
] | 2020-10-19 | [
[
"Giavoni",
"Cecilia",
""
],
[
"Schneider",
"Marc",
""
]
] | We present a generalization of the Hawking effect for dynamical trapping horizons by calculating the tunneling rate in the Hamilton-Jacobi formalism. It turns out that all horizons classified by Hayward are subjected to thermal quantum effects. While the Hawking effect for future outer and past inner trapping horizons ... |
gr-qc/0505018 | Xiaoning Wu | Xiaoning Wu, Chiang-Mei Chen and James M. Nester | Quasi-local energy-momentum and energy flux at null infinity | 14 pages, accepted by Phys.Rev.D | Phys.Rev. D71 (2005) 124010 | 10.1103/PhysRevD.71.124010 | null | gr-qc | null | The null infinity limit of the gravitational energy-momentum and energy flux
determined by the covariant Hamiltonian quasi-local expressions is evaluated
using the NP spin coefficients. The reference contribution is considered by
three different embedding approaches. All of them give the expected Bondi
energy and ene... | [
{
"created": "Wed, 4 May 2005 14:01:22 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Jun 2005 05:44:02 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Wu",
"Xiaoning",
""
],
[
"Chen",
"Chiang-Mei",
""
],
[
"Nester",
"James M.",
""
]
] | The null infinity limit of the gravitational energy-momentum and energy flux determined by the covariant Hamiltonian quasi-local expressions is evaluated using the NP spin coefficients. The reference contribution is considered by three different embedding approaches. All of them give the expected Bondi energy and energ... |
gr-qc/0006094 | hamid Reza Sepangi | S. S. Gousheh and H. R. Sepangi | Wave packets and initial conditions in quantum cosmology | 12 pages, 12 eps figures, to appear in Phys. Lett. A | Phys.Lett. A272 (2000) 304-312 | 10.1016/S0375-9601(00)00443-6 | null | gr-qc hep-th | null | We discuss the construction of wave packets resulting from the solutions of a
class of Wheeler-DeWitt equations in Robertson-Walker type cosmologies. We
present an ansatz for the initial conditions which leads to a unique
determination of the expansion coefficients in the construction of the wave
packets with probabi... | [
{
"created": "Tue, 27 Jun 2000 11:07:14 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Gousheh",
"S. S.",
""
],
[
"Sepangi",
"H. R.",
""
]
] | We discuss the construction of wave packets resulting from the solutions of a class of Wheeler-DeWitt equations in Robertson-Walker type cosmologies. We present an ansatz for the initial conditions which leads to a unique determination of the expansion coefficients in the construction of the wave packets with probabili... |
1603.05839 | Jose M. M. Senovilla | Marc Mars, Tim-Torben Paetz, Jos\'e M. M. Senovilla, Walter Simon | Characterization of (asymptotically) Kerr-de Sitter-like spacetimes at
null infinity | 49 pages. v2: Revised version with some changes with respect to the
published paper in order to amend a mistake in the statements of theorems 4
and 6 in arXiv:1307.5018v2 (corrected in v3). The validity of all results
remains unaltered | null | 10.1088/0264-9381/33/15/155001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate solutions $(\mathcal{M}, g)$ to Einstein's vacuum field
equations with positive cosmological constant $\Lambda$ which admit a smooth
past null infinity $\mathcal{J}^-$ \`a la Penrose and a Killing vector field
whose associated Mars-Simon tensor (MST) vanishes. The main purpose of this
work is to provid... | [
{
"created": "Fri, 18 Mar 2016 11:09:37 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Dec 2016 12:20:40 GMT",
"version": "v2"
}
] | 2016-12-20 | [
[
"Mars",
"Marc",
""
],
[
"Paetz",
"Tim-Torben",
""
],
[
"Senovilla",
"José M. M.",
""
],
[
"Simon",
"Walter",
""
]
] | We investigate solutions $(\mathcal{M}, g)$ to Einstein's vacuum field equations with positive cosmological constant $\Lambda$ which admit a smooth past null infinity $\mathcal{J}^-$ \`a la Penrose and a Killing vector field whose associated Mars-Simon tensor (MST) vanishes. The main purpose of this work is to provide ... |
2005.03028 | Kyriakos Destounis Dr. | Kyriakos Destounis, Rodrigo D. B. Fontana and Filipe C. Mena | Accelerating black holes: quasinormal modes and late-time tails | 15 pages, 8 figures, matches published version | Phys. Rev. D 102, 044005 (2020) | 10.1103/PhysRevD.102.044005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black holes found in binaries move at very high velocities relative to our
own reference frame and can accelerate due to the emission of gravitational
radiation. Here, we investigate the numerical stability and late-time behavior
of linear scalar perturbations in accelerating black holes described by the
$C-$metric. ... | [
{
"created": "Wed, 6 May 2020 18:00:01 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Aug 2020 19:13:39 GMT",
"version": "v2"
}
] | 2020-08-06 | [
[
"Destounis",
"Kyriakos",
""
],
[
"Fontana",
"Rodrigo D. B.",
""
],
[
"Mena",
"Filipe C.",
""
]
] | Black holes found in binaries move at very high velocities relative to our own reference frame and can accelerate due to the emission of gravitational radiation. Here, we investigate the numerical stability and late-time behavior of linear scalar perturbations in accelerating black holes described by the $C-$metric. We... |
2307.11463 | Vahideh Memari Rishakani | Mustafa Halilsoy and Vahideh Memari | General Relativistic Fall on a Thick-Plate | 11 pages, 1 figure | Int. J. Theor. Phys.,62, 219 (2023) | 10.1007/s10773-023-05474-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As an extension of a thin-shell, we adopt a single parametric plane-symmetric
Kasner-type spacetime to represent an exact thick-plate. This naturally extends
the domain wall spacetime to a domain thick-wall case. Physical properties of
such a plate with symmetry axis $z$ and thickness $0\leq z\leq z_{0}$ are
investig... | [
{
"created": "Fri, 21 Jul 2023 09:58:15 GMT",
"version": "v1"
}
] | 2023-10-13 | [
[
"Halilsoy",
"Mustafa",
""
],
[
"Memari",
"Vahideh",
""
]
] | As an extension of a thin-shell, we adopt a single parametric plane-symmetric Kasner-type spacetime to represent an exact thick-plate. This naturally extends the domain wall spacetime to a domain thick-wall case. Physical properties of such a plate with symmetry axis $z$ and thickness $0\leq z\leq z_{0}$ are investigat... |
2010.14918 | Rodrigo Ferreira Sobreiro | Amanda Guerrieri and Rodrigo F. Sobreiro | Non-relativistic limit of gravity theories in the first order formalism | 27 pages. No figures. V2 - Section 5 rewritten. Final version
accepted for publication at JHEP | JHEP 03 (2021) 104 | 10.1007/JHEP03(2021)104 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the non-relativistic limit of gravity in four dimensions in the
first order formalism. First, we revisit the case of the Einstein-Hilbert
action and formally discuss some geometrical configurations in vacuum and in
the presence of matter at leading order. Second, we consider the more general
Mardones-Zane... | [
{
"created": "Wed, 28 Oct 2020 12:28:11 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Jan 2021 12:01:44 GMT",
"version": "v2"
}
] | 2021-03-15 | [
[
"Guerrieri",
"Amanda",
""
],
[
"Sobreiro",
"Rodrigo F.",
""
]
] | We consider the non-relativistic limit of gravity in four dimensions in the first order formalism. First, we revisit the case of the Einstein-Hilbert action and formally discuss some geometrical configurations in vacuum and in the presence of matter at leading order. Second, we consider the more general Mardones-Zanell... |
2203.06506 | Reinoud Slagter | Reinoud Jan Slagter | The Dilaton Black Hole on a Conformal Invariant Five Dimensional Warped
Spacetime: Paradoxes Possibly Resolved? | V4 preliminary version. Some typos were corrected and the layout
improved. Any comment is welcome! 19 pictures | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | A thorough investigation is presented of the exact black hole solution on a
warped five-dimensional spacetime in conformal dilaton gravity (CDG), found in
earlier work. Summarized, we will prove: The black hole solution in the CDG
model on a warped 5D spacetime: 1. It is an exact solution for the metric
components as... | [
{
"created": "Sat, 12 Mar 2022 19:52:13 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Apr 2022 20:22:06 GMT",
"version": "v2"
},
{
"created": "Sat, 9 Apr 2022 09:15:54 GMT",
"version": "v3"
},
{
"created": "Mon, 18 Apr 2022 18:28:30 GMT",
"version": "v4"
}
] | 2022-04-20 | [
[
"Slagter",
"Reinoud Jan",
""
]
] | A thorough investigation is presented of the exact black hole solution on a warped five-dimensional spacetime in conformal dilaton gravity (CDG), found in earlier work. Summarized, we will prove: The black hole solution in the CDG model on a warped 5D spacetime: 1. It is an exact solution for the metric components as w... |
2301.07326 | Tao Wang | Zhi-Shuo Qu, Towe Wang, Chao-Jun Feng | Images of nonsingular nonrotating black holes in conformal gravity | 10 pages, 6 figures, footnotes and references added | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The accretion disk around a black hole and its emissions play an essential
role in theoretical analysis of the black hole image. In the literature, two
analytical toy models of accretions are widely adopted: the spherical model and
the thin disk model. They are different geometrically but both thin optically.
We poli... | [
{
"created": "Wed, 18 Jan 2023 06:19:47 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Feb 2023 19:41:27 GMT",
"version": "v2"
}
] | 2023-02-28 | [
[
"Qu",
"Zhi-Shuo",
""
],
[
"Wang",
"Towe",
""
],
[
"Feng",
"Chao-Jun",
""
]
] | The accretion disk around a black hole and its emissions play an essential role in theoretical analysis of the black hole image. In the literature, two analytical toy models of accretions are widely adopted: the spherical model and the thin disk model. They are different geometrically but both thin optically. We polish... |
gr-qc/0004051 | Michael C. Ashworth | Michael C. Ashworth Sean A. Hayward | Noether Currents of Charged Spherical Black Holes | 4 pages | Phys.Rev. D62 (2000) 064024 | 10.1103/PhysRevD.62.064024 | null | gr-qc | null | We calculate the Noether currents and charges for Einstein-Maxwell theory
using a version of the Wald approach. In spherical symmetry, the choice of time
can be taken as the Kodama vector. For the static case, the resulting combined
Einstein-Maxwell charge is just the mass of the black hole. Using either a
classicall... | [
{
"created": "Mon, 17 Apr 2000 08:37:59 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Hayward",
"Michael C. Ashworth Sean A.",
""
]
] | We calculate the Noether currents and charges for Einstein-Maxwell theory using a version of the Wald approach. In spherical symmetry, the choice of time can be taken as the Kodama vector. For the static case, the resulting combined Einstein-Maxwell charge is just the mass of the black hole. Using either a classically ... |
1201.4160 | Frans Klinkhamer | F. R. Klinkhamer | Entropic-gravity derivation of MOND | 6 pages; v5: published version | Mod. Phys. Lett. A 27, 1250056 (2012) | 10.1142/S0217732312500563 | KA-TP-02-2012 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A heuristic entropic-gravity derivation has previously been given of the
gravitational two-body force of modified Newtonian dynamics (MOND). Here, it is
shown that also another characteristic of MOND can be recovered, namely, the
external field effect (implying a violation of the Strong Equivalence
Principle). In fac... | [
{
"created": "Thu, 19 Jan 2012 19:53:58 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Jan 2012 19:07:54 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Jan 2012 19:02:15 GMT",
"version": "v3"
},
{
"created": "Tue, 14 Feb 2012 18:43:46 GMT",
"version": "v4"
},
{
"c... | 2012-04-05 | [
[
"Klinkhamer",
"F. R.",
""
]
] | A heuristic entropic-gravity derivation has previously been given of the gravitational two-body force of modified Newtonian dynamics (MOND). Here, it is shown that also another characteristic of MOND can be recovered, namely, the external field effect (implying a violation of the Strong Equivalence Principle). In fact,... |
1706.07446 | Daniel George | Daniel George, Hongyu Shen, E. A. Huerta | Deep Transfer Learning: A new deep learning glitch classification method
for advanced LIGO | null | null | 10.1103/PhysRevD.97.101501 | null | gr-qc astro-ph.IM cs.CV cs.LG cs.NE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The exquisite sensitivity of the advanced LIGO detectors has enabled the
detection of multiple gravitational wave signals. The sophisticated design of
these detectors mitigates the effect of most types of noise. However, advanced
LIGO data streams are contaminated by numerous artifacts known as glitches:
non-Gaussian... | [
{
"created": "Thu, 22 Jun 2017 18:11:13 GMT",
"version": "v1"
}
] | 2018-07-15 | [
[
"George",
"Daniel",
""
],
[
"Shen",
"Hongyu",
""
],
[
"Huerta",
"E. A.",
""
]
] | The exquisite sensitivity of the advanced LIGO detectors has enabled the detection of multiple gravitational wave signals. The sophisticated design of these detectors mitigates the effect of most types of noise. However, advanced LIGO data streams are contaminated by numerous artifacts known as glitches: non-Gaussian n... |
2306.13010 | Thanasis Giannakopoulos | Thanasis Giannakopoulos, Nigel T. Bishop, David Hilditch, Denis
Pollney, Miguel Zilh\~ao | Numerical convergence of model Cauchy-characteristic extraction and
matching | 20 pages, 11 figures, 2 tables, data and code can be found at
http://dx.doi.org/10.5281/zenodo.7981429 and
https://github.com/ThanasisGiannakopoulos/model_CCE_CCM_public, updated to
match published version | null | 10.1103/PhysRevD.108.104033 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waves provide a powerful enhancement to our understanding of
fundamental physics. To make the most of their detection we need to accurately
model the entire process of their emission and propagation toward
interferometers. Cauchy-characteristic extraction and matching are methods to
compute gravitationa... | [
{
"created": "Thu, 22 Jun 2023 16:19:00 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Nov 2023 22:00:03 GMT",
"version": "v2"
}
] | 2023-11-22 | [
[
"Giannakopoulos",
"Thanasis",
""
],
[
"Bishop",
"Nigel T.",
""
],
[
"Hilditch",
"David",
""
],
[
"Pollney",
"Denis",
""
],
[
"Zilhão",
"Miguel",
""
]
] | Gravitational waves provide a powerful enhancement to our understanding of fundamental physics. To make the most of their detection we need to accurately model the entire process of their emission and propagation toward interferometers. Cauchy-characteristic extraction and matching are methods to compute gravitational ... |
1405.5232 | Shamaila Rani | M. Sharif and Shamaila Rani | Viscous Dark Energy in $f(T)$ Gravity | 17 pages, 12 figures | Mod. Phys. Lett. A 28(2013)1350118 | 10.1142/S0217732313501186 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the bulk viscosity taking dust matter in the generalized
teleparallel gravity. We consider different dark energy models in this scenario
along with a time dependent viscous model to construct the viscous equation of
state parameter for these dark energy models. We discuss the graphical
representation of this... | [
{
"created": "Sun, 18 May 2014 15:45:52 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Sharif",
"M.",
""
],
[
"Rani",
"Shamaila",
""
]
] | We study the bulk viscosity taking dust matter in the generalized teleparallel gravity. We consider different dark energy models in this scenario along with a time dependent viscous model to construct the viscous equation of state parameter for these dark energy models. We discuss the graphical representation of this p... |
1407.7243 | George F. R. Ellis | George F R Ellis | The Evolving Block Universe and the Meshing Together of Times | 23 pages,4 figures | Ann N Y Acad Sci. (2014) Oct;1326:26-41 | 10.1111/nyas.12559 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is proposed that spacetime should be regarded as an evolving block
universe, bounded to the future by the present time, which continually extends
to the future. This future boundary is defined at each time by measuring proper
time along Ricci eigenlines from the start of the universe. A key point is that
physical ... | [
{
"created": "Sun, 27 Jul 2014 15:02:58 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Ellis",
"George F R",
""
]
] | It is proposed that spacetime should be regarded as an evolving block universe, bounded to the future by the present time, which continually extends to the future. This future boundary is defined at each time by measuring proper time along Ricci eigenlines from the start of the universe. A key point is that physical re... |
2401.09502 | Omar Mustafa | Omar Mustafa, Adriano R. Soares, Carlos F. S. Pereira, Ricardo L. L.
Vit\'oria | On the Klein-Gordon oscillators in Eddington-inspired Born-Infeld
gravity global monopole spacetime and a Wu-Yang magnetic monopole | 17 pages, 8 figures | Eur. Phys. J. C 84 (2024) 405 | 10.1140/epjc/s10052-024-12781-y | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We consider Klein-Gordon (KG) particles in a global monopole (GM) spacetime
within Eddington-inspired Born-Infeld gravity (EiBI-gravity) and in a Wu-Yang
magnetic monopole (WYMM). We discuss a set of KG-oscillators in such spacetime
settings. We propose a textbook power series expansion for the KG radial wave
functio... | [
{
"created": "Wed, 17 Jan 2024 09:34:05 GMT",
"version": "v1"
}
] | 2024-04-24 | [
[
"Mustafa",
"Omar",
""
],
[
"Soares",
"Adriano R.",
""
],
[
"Pereira",
"Carlos F. S.",
""
],
[
"Vitória",
"Ricardo L. L.",
""
]
] | We consider Klein-Gordon (KG) particles in a global monopole (GM) spacetime within Eddington-inspired Born-Infeld gravity (EiBI-gravity) and in a Wu-Yang magnetic monopole (WYMM). We discuss a set of KG-oscillators in such spacetime settings. We propose a textbook power series expansion for the KG radial wave function ... |
0808.1967 | Yuri Obukhov | Yuri N. Obukhov | Electromagnetic energy and momentum in moving media | 22 pages, Latex AdP-style, to appear in Minkowski's centenary issue
of Annalen der Physik | null | 10.1002/andp.200810313 | null | gr-qc hep-th physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The problem of the electromagnetic energy-momentum tensor is among the oldest
and the most controversial in macroscopic electrodynamics. In the center of the
issue is a dispute about the Minkowski and the Abraham tensors for moving
media. An overview of the current situation is presented. After putting the
discussion... | [
{
"created": "Thu, 14 Aug 2008 09:41:17 GMT",
"version": "v1"
}
] | 2008-08-15 | [
[
"Obukhov",
"Yuri N.",
""
]
] | The problem of the electromagnetic energy-momentum tensor is among the oldest and the most controversial in macroscopic electrodynamics. In the center of the issue is a dispute about the Minkowski and the Abraham tensors for moving media. An overview of the current situation is presented. After putting the discussion i... |
2210.01909 | Michael Gammon | Michael Gammon, Robert Mann | Slowly Rotating Black Holes in 4D Einstein Gauss-Bonnet Gravity | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Since the recent derivation of a well-defined $D\rightarrow 4$ limit for
regularized 4D Einstein Gauss-Bonnet (4DEGB) gravity, there has been
considerable interest in testing it as an alternative to Einstein's general
theory of relativity. In this paper we construct slowly rotating black hole
solutions for 4DEGB grav... | [
{
"created": "Tue, 4 Oct 2022 21:09:30 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Nov 2022 22:02:22 GMT",
"version": "v2"
},
{
"created": "Sat, 30 Mar 2024 19:53:19 GMT",
"version": "v3"
}
] | 2024-04-02 | [
[
"Gammon",
"Michael",
""
],
[
"Mann",
"Robert",
""
]
] | Since the recent derivation of a well-defined $D\rightarrow 4$ limit for regularized 4D Einstein Gauss-Bonnet (4DEGB) gravity, there has been considerable interest in testing it as an alternative to Einstein's general theory of relativity. In this paper we construct slowly rotating black hole solutions for 4DEGB gravit... |
gr-qc/0507085 | Ugur Camci | Ugur Camci | Dirac Analysis and Integrability of Geodesic Equations for Cylindrically
Symmetric Spacetimes | 12 Pages, Latex, no figures | Int.J.Mod.Phys. D12 (2003) 1431 | 10.1142/S0218271803003621 | null | gr-qc | null | Dirac's constraint analysis and the symplectic structure of geodesic
equations are obtained for the general cylindrically symmetric stationary
spacetime. For this metric, using the obtained first order Lagrangian, the
geodesic equations of motion are integrated, and found some solutions for
Lewis, Levi-Civita, and Va... | [
{
"created": "Tue, 19 Jul 2005 08:06:47 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Camci",
"Ugur",
""
]
] | Dirac's constraint analysis and the symplectic structure of geodesic equations are obtained for the general cylindrically symmetric stationary spacetime. For this metric, using the obtained first order Lagrangian, the geodesic equations of motion are integrated, and found some solutions for Lewis, Levi-Civita, and Van ... |
2211.08027 | Fethi M. Ramazanoglu | Andrew Coates and Fethi M. Ramazano\u{g}lu | Coordinate singularities of self-interacting vector field theories | 5 pages, 2 figures. Minor changes to bring into line with published
version in PRL | Phys. Rev. Lett. 130, 021401 (2023) | 10.1103/PhysRevLett.130.021401 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Self-interacting vectors are seeing a burst of interest where various groups
demonstrated that the field evolution ends in finite time. Two nonequivalent
criteria have been offered to identify this breakdown: (i) the vector
constraint equation cannot be satisfied beyond a point where the breakdown
occurs, (ii) the dy... | [
{
"created": "Tue, 15 Nov 2022 10:19:08 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Jan 2023 19:19:35 GMT",
"version": "v2"
}
] | 2023-01-19 | [
[
"Coates",
"Andrew",
""
],
[
"Ramazanoğlu",
"Fethi M.",
""
]
] | Self-interacting vectors are seeing a burst of interest where various groups demonstrated that the field evolution ends in finite time. Two nonequivalent criteria have been offered to identify this breakdown: (i) the vector constraint equation cannot be satisfied beyond a point where the breakdown occurs, (ii) the dyna... |
1406.2571 | Ivan Arraut | Ivan Arraut | The Komar mass function in the de-Rham-Gabadadze-Tolley non-linear
theory of massive gravity | Version to appear in Physical Review D | Phys.Rev.D90, (2014) 124082 | 10.1103/PhysRevD.90.124082 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I derive the Komar mass/function for the Schwarszchild de-Sitter (S-dS)
black-hole inside the dRGT non-linear theory of massive gravity by taking the
usual notion of time-like Killing vector in unitary gauge. The dRGT Komar
function depends on the dynamics of the St\"uckelberg fields through the gauge
transformation ... | [
{
"created": "Mon, 9 Jun 2014 15:48:19 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Dec 2014 15:00:30 GMT",
"version": "v2"
}
] | 2014-12-31 | [
[
"Arraut",
"Ivan",
""
]
] | I derive the Komar mass/function for the Schwarszchild de-Sitter (S-dS) black-hole inside the dRGT non-linear theory of massive gravity by taking the usual notion of time-like Killing vector in unitary gauge. The dRGT Komar function depends on the dynamics of the St\"uckelberg fields through the gauge transformation fu... |
0902.0217 | Ahmadjon Abdujabbarov | B.V. Turimov, B.J. Ahmedov, A.A. Abdujabbarov | Electromagnetic Fields of Slowly Rotating Magnetized Gravastars | 5 pages, 2 figures, accepted for publication to Mod. Phys. Lett. A | Mod.Phys.Lett.A24:733-737,2009 | 10.1142/S0217732309030497 | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the dipolar magnetic field configuration and present solutions of
Maxwell equations in the internal background spacetime of a a slowly rotating
gravastar. The shell of gravastar where magnetic field penetrated is modeled as
sphere consisting of perfect highly magnetized fluid with infinite
conductivity. Dipo... | [
{
"created": "Mon, 2 Feb 2009 07:55:08 GMT",
"version": "v1"
}
] | 2010-04-20 | [
[
"Turimov",
"B. V.",
""
],
[
"Ahmedov",
"B. J.",
""
],
[
"Abdujabbarov",
"A. A.",
""
]
] | We study the dipolar magnetic field configuration and present solutions of Maxwell equations in the internal background spacetime of a a slowly rotating gravastar. The shell of gravastar where magnetic field penetrated is modeled as sphere consisting of perfect highly magnetized fluid with infinite conductivity. Dipola... |
1409.8534 | Peter K.F. Kuhfittig | Peter K.F. Kuhfittig | On the stability of thin-shell wormholes | 5 pages, no figures | Fundamental J. Mod. Phys., vol. 7, 111-119 (2014) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A thin-shell wormhole is theoretically constructible by surgically grafting
together two Schwarzschild spacetimes using the so-called cut-and-paste
technique. By describing such a wormhole as the limiting case of a spherical
shell, it is shown that the structure must be unstable to linearized radial
perturbations. So... | [
{
"created": "Tue, 30 Sep 2014 13:16:34 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Nov 2014 18:11:41 GMT",
"version": "v2"
},
{
"created": "Thu, 18 Dec 2014 18:20:00 GMT",
"version": "v3"
},
{
"created": "Sun, 30 Aug 2015 13:32:57 GMT",
"version": "v4"
},
{
"cr... | 2016-03-07 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | A thin-shell wormhole is theoretically constructible by surgically grafting together two Schwarzschild spacetimes using the so-called cut-and-paste technique. By describing such a wormhole as the limiting case of a spherical shell, it is shown that the structure must be unstable to linearized radial perturbations. Some... |
gr-qc/0103033 | Edward Malec | Edward Malec and Gerhard Schaefer | Can Schwarzschildean gravitational fields suppress gravitational waves? | 18 pages, Revtex. Added three references; a new comment in Sec. 7;
several misprints corrected. To appear in the Phys. Rev. D | Phys.Rev.D64:044012,2001 | 10.1103/PhysRevD.64.044012 | null | gr-qc astro-ph | null | Gravitational waves in the linear approximation propagate in the
Schwarzschild spacetime similarly as electromagnetic waves. A fraction of the
radiation scatters off the curvature of the geometry. The energy of the
backscattered part of an initially outgoing pulse of the quadrupole
gravitational radiation is estimate... | [
{
"created": "Fri, 9 Mar 2001 21:04:45 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Jun 2001 08:06:41 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Malec",
"Edward",
""
],
[
"Schaefer",
"Gerhard",
""
]
] | Gravitational waves in the linear approximation propagate in the Schwarzschild spacetime similarly as electromagnetic waves. A fraction of the radiation scatters off the curvature of the geometry. The energy of the backscattered part of an initially outgoing pulse of the quadrupole gravitational radiation is estimated ... |
gr-qc/9903070 | S. M. Kopeikin | Sergei M. Kopeikin | Timing Effects of Gravitational Waves from Localized Sources | 6 pages, 2 figures, a talk given at the XXXIVth Rencontres de Moriond
on "Gravitational Waves and Experimental Gravity", Les Arcs, 23-30 January
1999 | null | null | null | gr-qc astro-ph | null | Localized astronomical sources like a double stellar system, rotating neutron
star, or a massive black hole at the center of the Milky Way emit periodic
gravitational waves. For a long time only a far-zone contribution of
gravitational fields of the localized sources (plane-wave-front approximation)
were a matter of ... | [
{
"created": "Thu, 18 Mar 1999 22:38:37 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kopeikin",
"Sergei M.",
""
]
] | Localized astronomical sources like a double stellar system, rotating neutron star, or a massive black hole at the center of the Milky Way emit periodic gravitational waves. For a long time only a far-zone contribution of gravitational fields of the localized sources (plane-wave-front approximation) were a matter of th... |
2403.19458 | Vinod Kumar Bhardwaj Dr. | Bhojraj Singh Jayas and Vinod Kumar Bhardwaj | Evaluation of Transit cosmological model in $f(R,T^{\phi})$ theory of
gravity | 18 pages, 13 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We have explored a transitioning cosmic model, depicting late-time
accelerated expansion in $f(R,T^{\phi})$ theory of gravity for an isotropic and
homogeneous universe, where the trace of energy-momentum tensor $T^{\phi}$ is
the function of the self-interacting scalar field $\phi$. We have proposed an
explicit soluti... | [
{
"created": "Thu, 28 Mar 2024 14:30:40 GMT",
"version": "v1"
}
] | 2024-03-29 | [
[
"Jayas",
"Bhojraj Singh",
""
],
[
"Bhardwaj",
"Vinod Kumar",
""
]
] | We have explored a transitioning cosmic model, depicting late-time accelerated expansion in $f(R,T^{\phi})$ theory of gravity for an isotropic and homogeneous universe, where the trace of energy-momentum tensor $T^{\phi}$ is the function of the self-interacting scalar field $\phi$. We have proposed an explicit solution... |
2008.12327 | Parthapratim Pradhan | Parthapratim Pradhan | Black Hole versus Naked Singularity via Axial Perturbation | 19 pages, 56 figures | null | null | null | gr-qc astro-ph.GA | http://creativecommons.org/licenses/by/4.0/ | We differentiate non-extremal black hole, \emph{extremal} black hole and
\emph{naked singularity} via metric perturbations for Reissner-Nordstr\"{o}m
spacetime. First we study the axial perturbations for \emph{extremal}
Reissner-Nordstr\"{o}m black hole and compute the effective potential due to
these perturbations. ... | [
{
"created": "Thu, 27 Aug 2020 18:35:59 GMT",
"version": "v1"
}
] | 2020-08-31 | [
[
"Pradhan",
"Parthapratim",
""
]
] | We differentiate non-extremal black hole, \emph{extremal} black hole and \emph{naked singularity} via metric perturbations for Reissner-Nordstr\"{o}m spacetime. First we study the axial perturbations for \emph{extremal} Reissner-Nordstr\"{o}m black hole and compute the effective potential due to these perturbations. Th... |
1011.4988 | Aron Wall | Sudipta Sarkar, Aron C. Wall | Second Law Violations in Lovelock Gravity for Black Hole Mergers | 15 pages, 1 figure, v2 Title change & minor revisions to match
published version, v3 fixed accidental deletion of author names | Phys.Rev.D83:124048,2011 | 10.1103/PhysRevD.83.124048 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the classical second law of black hole thermodynamics, for Lovelock
theories (other than General Relativity), in arbitrary dimensions. Using the
standard formula for black hole entropy, we construct scenarios involving the
merger of two black holes in which the entropy instantaneously decreases. Our
construc... | [
{
"created": "Tue, 23 Nov 2010 01:56:27 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Sep 2011 17:11:43 GMT",
"version": "v2"
},
{
"created": "Fri, 2 Oct 2015 21:34:28 GMT",
"version": "v3"
}
] | 2015-10-06 | [
[
"Sarkar",
"Sudipta",
""
],
[
"Wall",
"Aron C.",
""
]
] | We study the classical second law of black hole thermodynamics, for Lovelock theories (other than General Relativity), in arbitrary dimensions. Using the standard formula for black hole entropy, we construct scenarios involving the merger of two black holes in which the entropy instantaneously decreases. Our constructi... |
2105.07750 | Yonadav Barry Ginat | Yonadav Barry Ginat | The Equivalence Principle and The Cosmological Constant Problem | The essay received an Honorable Mention in the Gravity Research
Foundation essay competition 2021 | null | null | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this essay I point out that, in the context of semi-classical gravity, the
equivalence principle can mitigate the cosmological constant problem. On a
Minkowski space-time background with the usual $\mathbb{R}^4$ topology, the
vacuum self-energy is removed by normal ordering; this is allowed because it is
not obser... | [
{
"created": "Mon, 17 May 2021 11:52:54 GMT",
"version": "v1"
}
] | 2021-05-18 | [
[
"Ginat",
"Yonadav Barry",
""
]
] | In this essay I point out that, in the context of semi-classical gravity, the equivalence principle can mitigate the cosmological constant problem. On a Minkowski space-time background with the usual $\mathbb{R}^4$ topology, the vacuum self-energy is removed by normal ordering; this is allowed because it is not observa... |
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