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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1509.03902 | Scott Fraser | Scott Fraser, Shaker Von Price Funkhouser | Energy Extremum Principle for Charged Black Holes | 9 pages, 2 figures, REVTeX 4.1; minor changes to title and text;
matches published version | Phys. Rev. D 92, 104016 (2015) | 10.1103/PhysRevD.92.104016 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For a set of $N$ asymptotically flat black holes with arbitrary charges and
masses, all initially at rest and well separated, we prove the following
extremum principle: the extremal charge configuration ($|q_i|=m_i$ for each
black hole) can be derived by extremizing the total energy, for variations of
the black hole ... | [
{
"created": "Sun, 13 Sep 2015 22:04:05 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Nov 2015 20:31:58 GMT",
"version": "v2"
}
] | 2015-11-09 | [
[
"Fraser",
"Scott",
""
],
[
"Funkhouser",
"Shaker Von Price",
""
]
] | For a set of $N$ asymptotically flat black holes with arbitrary charges and masses, all initially at rest and well separated, we prove the following extremum principle: the extremal charge configuration ($|q_i|=m_i$ for each black hole) can be derived by extremizing the total energy, for variations of the black hole ap... |
gr-qc/0507073 | Enric Verdaguer | E. Verdaguer | Validity of semiclassical gravity in the stochastic gravity approach | Second Intenational Workshop DICE2004 | Braz.J.Phys.35:271-279,2005 | null | null | gr-qc | null | In semiclassical gravity the back-reaction of the classical gravitational
field interacting with quantum matter fields is described by the semiclassical
Einstein equations. A criterion for the validity of semiclassical gravity based
on the stability of the solutions of the semiclassical Einstein equations with
respec... | [
{
"created": "Mon, 18 Jul 2005 10:51:56 GMT",
"version": "v1"
}
] | 2011-08-04 | [
[
"Verdaguer",
"E.",
""
]
] | In semiclassical gravity the back-reaction of the classical gravitational field interacting with quantum matter fields is described by the semiclassical Einstein equations. A criterion for the validity of semiclassical gravity based on the stability of the solutions of the semiclassical Einstein equations with respect ... |
1903.03940 | Shoulong Li | Shou-Long Li, H. L\"u, Hao Wei, Puxun Wu and Hongwei Yu | Emergent Universe Scenario, Bouncing and Cyclic Universes in Degenerate
Massive Gravity | 30 pages, 2 figures; published version | Phys. Rev. D 99, 104057 (2019) | 10.1103/PhysRevD.99.104057 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider alternative inflationary cosmologies in massive gravity with
degenerate reference metrics and study the feasibilities of the emergent
universe scenario, bouncing and cyclic universes. We focus on the construction
of the Einstein static universe, classes of exact solutions of bouncing and
cyclic universes ... | [
{
"created": "Sun, 10 Mar 2019 06:51:23 GMT",
"version": "v1"
},
{
"created": "Sat, 25 May 2019 01:45:53 GMT",
"version": "v2"
}
] | 2019-05-28 | [
[
"Li",
"Shou-Long",
""
],
[
"Lü",
"H.",
""
],
[
"Wei",
"Hao",
""
],
[
"Wu",
"Puxun",
""
],
[
"Yu",
"Hongwei",
""
]
] | We consider alternative inflationary cosmologies in massive gravity with degenerate reference metrics and study the feasibilities of the emergent universe scenario, bouncing and cyclic universes. We focus on the construction of the Einstein static universe, classes of exact solutions of bouncing and cyclic universes in... |
2306.01274 | Liubov Panasenko | A. D. Dolgov, L. A. Panasenko | Mixing of scalar and tensor metric perturbations | 10 pages | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Metric perturbations in General Relativity are usually separated into three
distinct classes: scalar, vector, and tensor. In many cases these modes are
separable, i.e. they satisfy independent equations of motion for each mode.
However, in the present paper we argue that in many cases tensor and scalar
modes are not ... | [
{
"created": "Fri, 2 Jun 2023 05:23:48 GMT",
"version": "v1"
}
] | 2023-06-05 | [
[
"Dolgov",
"A. D.",
""
],
[
"Panasenko",
"L. A.",
""
]
] | Metric perturbations in General Relativity are usually separated into three distinct classes: scalar, vector, and tensor. In many cases these modes are separable, i.e. they satisfy independent equations of motion for each mode. However, in the present paper we argue that in many cases tensor and scalar modes are not se... |
2109.03422 | Seema Satin | Seema Satin | Correspondences of matter fluctuations in semiclassical and classical
gravity for cosmological spacetime-II | null | null | 10.1088/1361-6382/ac5eb8 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A correspondence between fluctuations of non-minimally coupled scalar fields
and that of an effective fluid with heat flux and anisotropic stresses, is
shown. Though the correspondence between respective stress tensors of scalar
fields and fluids is known and widely used in literature, the fluctuations in
the two cas... | [
{
"created": "Wed, 8 Sep 2021 04:10:26 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Sep 2021 10:38:15 GMT",
"version": "v2"
}
] | 2022-05-18 | [
[
"Satin",
"Seema",
""
]
] | A correspondence between fluctuations of non-minimally coupled scalar fields and that of an effective fluid with heat flux and anisotropic stresses, is shown. Though the correspondence between respective stress tensors of scalar fields and fluids is known and widely used in literature, the fluctuations in the two cases... |
1509.02398 | David Keitel | David Keitel | Robust semicoherent searches for continuous gravitational waves with
noise and signal models including hours to days long transients | 16 pages, 6 figures, REVTeX4.1 | Phys. Rev. D 93, 084024 (2016) | 10.1103/PhysRevD.93.084024 | LIGO-P1500159 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The vulnerability to single-detector instrumental artifacts in standard
detection methods for long-duration quasimonochromatic gravitational waves from
nonaxisymmetric rotating neutron stars [continuous waves (CWs)] was addressed
in past work [D. Keitel et al., Phys. Rev. D 89, 064023 (2014).] by a Bayesian
approach.... | [
{
"created": "Tue, 8 Sep 2015 14:58:15 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Apr 2016 10:11:03 GMT",
"version": "v2"
}
] | 2016-04-26 | [
[
"Keitel",
"David",
""
]
] | The vulnerability to single-detector instrumental artifacts in standard detection methods for long-duration quasimonochromatic gravitational waves from nonaxisymmetric rotating neutron stars [continuous waves (CWs)] was addressed in past work [D. Keitel et al., Phys. Rev. D 89, 064023 (2014).] by a Bayesian approach. A... |
1908.11595 | Alireza Amani | A. Pourbagher and Alireza Amani | Thermodynamics and stability of $f(T,B)$ gravity with viscous fluid by
observational constraints | 15 pages, 5 figures | Astrophys Space Sci (2019) 364: 140 | 10.1007/s10509-019-3631-z | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the model of $f(T, B)$ gravity with viscous fluid in
flat-FRW metric, in which $T$ and $B$ are torsion scalar and boundary term,
respectively. We obtain the Friedmann equations in the framework of modified
teleparallel gravity by tetrad components. We consider an interacting model
between matt... | [
{
"created": "Fri, 30 Aug 2019 08:53:54 GMT",
"version": "v1"
}
] | 2019-09-02 | [
[
"Pourbagher",
"A.",
""
],
[
"Amani",
"Alireza",
""
]
] | In this paper, we study the model of $f(T, B)$ gravity with viscous fluid in flat-FRW metric, in which $T$ and $B$ are torsion scalar and boundary term, respectively. We obtain the Friedmann equations in the framework of modified teleparallel gravity by tetrad components. We consider an interacting model between matter... |
gr-qc/0301002 | Banibrata Mukhopadhyay | Banibrata Mukhopadhyay and Parampreet Singh | Black holes as a source of neutrino asymmetry in Universe | 9 pages, RevTeX format | null | null | null | gr-qc | null | Propagation of fermions in curved space-time generates gravitational
interaction due to coupling of its spin with space-time curvature connection.
This gravitational interaction, which is an axial-four-vector multiplied by a
four gravitational vector potential, appears as CPT violating term in the
Lagrangian which ge... | [
{
"created": "Wed, 1 Jan 2003 06:59:32 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Sep 2003 15:17:33 GMT",
"version": "v2"
},
{
"created": "Wed, 17 Sep 2003 15:05:30 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Mukhopadhyay",
"Banibrata",
""
],
[
"Singh",
"Parampreet",
""
]
] | Propagation of fermions in curved space-time generates gravitational interaction due to coupling of its spin with space-time curvature connection. This gravitational interaction, which is an axial-four-vector multiplied by a four gravitational vector potential, appears as CPT violating term in the Lagrangian which gene... |
gr-qc/0703128 | Ettore Minguzzi | E. Minguzzi | The causal ladder and the strength of K-causality. II | 27 pages, 2 figures, uses Latex package "psfrag". v3: Old title: ``On
the relationship between stable causality and K-causality''. v4: fixed a
small problem with lemma 5.5 | Class.Quant.Grav.25:015010,2008 | 10.1088/0264-9381/25/1/015010 | null | gr-qc | null | Hawking's stable causality implies Sorkin and Woolgar's K-causality. The work
investigates the possible equivalence between the two causality requirements,
an issue which was first considered by H. Seifert and then raised again by R.
Low after the introduction of K-causality. First, a new proof is given that a
spacet... | [
{
"created": "Mon, 26 Mar 2007 20:40:08 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Aug 2007 15:29:06 GMT",
"version": "v2"
},
{
"created": "Tue, 20 Nov 2007 12:54:56 GMT",
"version": "v3"
},
{
"created": "Thu, 29 Nov 2007 14:34:37 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Minguzzi",
"E.",
""
]
] | Hawking's stable causality implies Sorkin and Woolgar's K-causality. The work investigates the possible equivalence between the two causality requirements, an issue which was first considered by H. Seifert and then raised again by R. Low after the introduction of K-causality. First, a new proof is given that a spacetim... |
2403.07782 | Leonardo Garc\'ia-Heveling | Leonardo Garc\'ia-Heveling | Minimal Elements of the Causal Boundary with Applications to Spacetime
Splitting | 13 pages, 2 figures. Changes in v2: Added a new result (thm. 1.6),
mild restructuring of the previous content | null | null | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In 1972, Geroch, Kronheimer, and Penrose introduced what is now called the
causal boundary of a spacetime. This boundary is constructed out of Terminal
Indecomposable Past sets (TIPs) and their future analogues (TIFs), which are
the pasts and futures of inextendible causal curves. The causal boundary is a
key tool to... | [
{
"created": "Tue, 12 Mar 2024 16:09:50 GMT",
"version": "v1"
},
{
"created": "Fri, 17 May 2024 13:50:33 GMT",
"version": "v2"
}
] | 2024-05-20 | [
[
"García-Heveling",
"Leonardo",
""
]
] | In 1972, Geroch, Kronheimer, and Penrose introduced what is now called the causal boundary of a spacetime. This boundary is constructed out of Terminal Indecomposable Past sets (TIPs) and their future analogues (TIFs), which are the pasts and futures of inextendible causal curves. The causal boundary is a key tool to u... |
1706.02662 | Andronikos Paliathanasis | Andronikos Paliathanasis | de Sitter and Scaling solutions in a higher-order modified teleparallel
theory | 20 pages, 4 figures, references updated, to be published in JCAP | null | 10.1088/1475-7516/2017/08/027 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The existence and the stability conditions for some exact relativistic
solutions of special interest are studied in a higher-order modified
teleparallel gravitational theory. The theory with the use of a Lagrange
multiplier is equivalent with that of General Relativity with a minimally
coupled noncanonical field. The... | [
{
"created": "Thu, 8 Jun 2017 16:06:59 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Aug 2017 11:01:39 GMT",
"version": "v2"
}
] | 2017-08-30 | [
[
"Paliathanasis",
"Andronikos",
""
]
] | The existence and the stability conditions for some exact relativistic solutions of special interest are studied in a higher-order modified teleparallel gravitational theory. The theory with the use of a Lagrange multiplier is equivalent with that of General Relativity with a minimally coupled noncanonical field. The c... |
2112.06163 | Davide Batic | Davide Batic, Hadeel Ali Kittaneh, Marek Nowakowski | Relevant scales for the $C$-metric with positive cosmological constant | 22 pages, 7 figures | Physical Review D 104, 124029 (2021) | 10.1103/PhysRevD.104.124029 | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | In this work, we study the weak and strong gravitational lensing in the
presence of an accelerating black hole in a universe with positive cosmological
constant $\Lambda$. First of all, we derive new perturbative formulae for the
event and cosmological horizons in terms of the Schwarzschild, cosmological and
accelera... | [
{
"created": "Sun, 12 Dec 2021 06:12:32 GMT",
"version": "v1"
}
] | 2021-12-14 | [
[
"Batic",
"Davide",
""
],
[
"Kittaneh",
"Hadeel Ali",
""
],
[
"Nowakowski",
"Marek",
""
]
] | In this work, we study the weak and strong gravitational lensing in the presence of an accelerating black hole in a universe with positive cosmological constant $\Lambda$. First of all, we derive new perturbative formulae for the event and cosmological horizons in terms of the Schwarzschild, cosmological and accelerati... |
1410.8183 | Vasilis Oikonomou | S.D. Odintsov, V.K. Oikonomou | Matter Bounce Loop Quantum Cosmology from $F(R)$ Gravity | Minor Revision, matches PRD version | Phys. Rev. D 90, 124083 (2014) | 10.1103/PhysRevD.90.124083 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the reconstruction method, we investigate which $F(R)$ theories, with
or without the presence of matter fluids, can produce the matter bounce
scenario of holonomy corrected Loop Quantum Cosmology. We focus our study in
two limits of the cosmic time, the large cosmic time limit and the small cosmic
time limit. F... | [
{
"created": "Wed, 29 Oct 2014 22:37:05 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Dec 2014 17:36:11 GMT",
"version": "v2"
}
] | 2015-01-07 | [
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K.",
""
]
] | Using the reconstruction method, we investigate which $F(R)$ theories, with or without the presence of matter fluids, can produce the matter bounce scenario of holonomy corrected Loop Quantum Cosmology. We focus our study in two limits of the cosmic time, the large cosmic time limit and the small cosmic time limit. For... |
2205.07748 | Theodoros Papanikolaou | Theodoros Papanikolaou | Toward the primordial black hole formation threshold in a time-dependent
equation-of-state background | Rescaling of the x-axis of Fig. 2 | null | 10.1103/PhysRevD.105.124055 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The study of the primordial black hole (PBH) gravitational collapse process
requires the determination of a critical energy density perturbation threshold
$\delta_\mathrm{c}$, which depends on the equation of state of the universe at
the time of PBH formation. Up to now, the majority of analytical and numerical
techn... | [
{
"created": "Mon, 16 May 2022 15:22:32 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Jun 2022 16:27:48 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Aug 2022 11:18:52 GMT",
"version": "v3"
}
] | 2022-08-29 | [
[
"Papanikolaou",
"Theodoros",
""
]
] | The study of the primordial black hole (PBH) gravitational collapse process requires the determination of a critical energy density perturbation threshold $\delta_\mathrm{c}$, which depends on the equation of state of the universe at the time of PBH formation. Up to now, the majority of analytical and numerical techniq... |
1303.3897 | Jose Wadih Maluf Dr. | J. W. Maluf | The teleparallel equivalent of general relativity | 41 pages, 1 figure, published by the Annalen der Physik | null | 10.1002/andp.201200272 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A review of the teleparallel equivalent of general relativity is presented.
It is emphasized that general relativity may be formulated in terms of the
tetrad fields and of the torsion tensor, and that this geometrical formulation
leads to alternative insights into the theory. The equivalence with the
standard formula... | [
{
"created": "Fri, 15 Mar 2013 20:18:27 GMT",
"version": "v1"
}
] | 2013-03-19 | [
[
"Maluf",
"J. W.",
""
]
] | A review of the teleparallel equivalent of general relativity is presented. It is emphasized that general relativity may be formulated in terms of the tetrad fields and of the torsion tensor, and that this geometrical formulation leads to alternative insights into the theory. The equivalence with the standard formulati... |
0906.0463 | Paolo Bonifacio | Paolo M. Bonifacio | Spacetime Conformal Fluctuations and Quantum Dephasing | PhD thesis, 164 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Any quantum system interacting with a complex environment undergoes
decoherence. Empty space is filled with vacuum energy due to matter fields in
their ground state and represents an underlying environment that any quantum
particle has to cope with. In particular quantum gravity vacuum fluctuations
should represent a... | [
{
"created": "Tue, 2 Jun 2009 11:36:32 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Aug 2009 13:15:55 GMT",
"version": "v2"
}
] | 2009-08-26 | [
[
"Bonifacio",
"Paolo M.",
""
]
] | Any quantum system interacting with a complex environment undergoes decoherence. Empty space is filled with vacuum energy due to matter fields in their ground state and represents an underlying environment that any quantum particle has to cope with. In particular quantum gravity vacuum fluctuations should represent a u... |
gr-qc/0305051 | Leonid Grishchuk | L. P. Grishchuk | Update on gravitational-wave research | final revised version, to appear in the "Astrophysics Update" ed
J.W.Mason (Springer-Praxis, 2004), 18 pages including 8 figures | null | null | null | gr-qc astro-ph hep-ph hep-th | null | The recently assembled laser-beam detectors of gravitational waves are
approaching the planned level of sensitivity. In the coming 1 - 2 years, we may
be observing the rare but powerful events of inspiral and merger of binary
stellar-mass black holes. More likely, we will have to wait for a few years
longer, until th... | [
{
"created": "Tue, 13 May 2003 16:04:21 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Nov 2003 15:13:43 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Grishchuk",
"L. P.",
""
]
] | The recently assembled laser-beam detectors of gravitational waves are approaching the planned level of sensitivity. In the coming 1 - 2 years, we may be observing the rare but powerful events of inspiral and merger of binary stellar-mass black holes. More likely, we will have to wait for a few years longer, until the ... |
gr-qc/0007071 | Takashi Uchiyama | T. Uchiyama, T. Tomaru, D. Tatsumi, S. Miyoki, M. Ohashi, K. Kuroda,
T. Suzuki, A. Yamamoto, T. Shintomi | Mechanical quality factor of a sapphire fiber at cryogenic temperatures | To be published to Physiscs Letters A. Number of pages: 10 Number of
figures: 5 Number of tables: 1 | Phys.Lett. A273 (2000) 310-315 | 10.1016/S0375-9601(00)00514-4 | null | gr-qc | null | A mechanical quality factor of $1.1 \times 10^{7}$ was obtained for the 199
Hz bending vibrational mode in a monocrystalline sapphire fiber at 6 K.
Consequently, we confirm that pendulum thermal noise of cryogenic mirrors used
for gravitational wave detectors can be reduced by the sapphire fiber
suspension.
| [
{
"created": "Thu, 27 Jul 2000 06:59:48 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Uchiyama",
"T.",
""
],
[
"Tomaru",
"T.",
""
],
[
"Tatsumi",
"D.",
""
],
[
"Miyoki",
"S.",
""
],
[
"Ohashi",
"M.",
""
],
[
"Kuroda",
"K.",
""
],
[
"Suzuki",
"T.",
""
],
[
"Yamamoto",
"A.",
"... | A mechanical quality factor of $1.1 \times 10^{7}$ was obtained for the 199 Hz bending vibrational mode in a monocrystalline sapphire fiber at 6 K. Consequently, we confirm that pendulum thermal noise of cryogenic mirrors used for gravitational wave detectors can be reduced by the sapphire fiber suspension. |
1605.03233 | Vladimir Dergachev Ph.D. | The LIGO Scientific Collaboration and the Virgo Collaboration: B. P.
Abbott, R. Abbott, T. D. Abbott, M. R. Abernathy, F. Acernese, K. Ackley, C.
Adams, T. Adams, P. Addesso, R. X. Adhikari, V. B. Adya, C. Affeldt, M.
Agathos, K. Agatsuma, N. Aggarwal, O. D. Aguiar, L. Aiello, A. Ain, P. Ajith,
B. Allen, A. All... | Comprehensive All-sky Search for Periodic Gravitational Waves in the
Sixth Science Run LIGO Data | null | Phys. Rev. D 94, 042002 (2016) | 10.1103/PhysRevD.94.042002 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on a comprehensive all-sky search for periodic gravitational waves
in the frequency band 100-1500 Hz and with a frequency time derivative in the
range of $[-1.18, +1.00]\times 10^{-8}$ Hz/s. Such a signal could be produced
by a nearby spinning and slightly non-axisymmetric isolated neutron star in our
galax... | [
{
"created": "Tue, 10 May 2016 22:45:20 GMT",
"version": "v1"
},
{
"created": "Sat, 9 Jul 2016 15:19:00 GMT",
"version": "v2"
}
] | 2016-08-24 | [
[
"The LIGO Scientific Collaboration",
"",
""
],
[
"the Virgo Collaboration",
"",
""
],
[
"Abbott",
"B. P.",
""
],
[
"Abbott",
"R.",
""
],
[
"Abbott",
"T. D.",
""
],
[
"Abernathy",
"M. R.",
""
],
[
"Acernese",
"F... | We report on a comprehensive all-sky search for periodic gravitational waves in the frequency band 100-1500 Hz and with a frequency time derivative in the range of $[-1.18, +1.00]\times 10^{-8}$ Hz/s. Such a signal could be produced by a nearby spinning and slightly non-axisymmetric isolated neutron star in our galaxy.... |
2212.04763 | Banibrata Mukhopadhyay | Achal Kumar, Banibrata Mukhopadhyay | Covariant formalism for the Berry connection due to gravity | 6 pages; published in Scientific Voyage | Scientific Voyage 3 (2022) 19 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well-known that Dirac particles gain geometric phase, namely Berry
phase, while moving in an electromagnetic field. Researchers have already shown
covariant formalism for the Berry connection due to an electromagnetic field. A
similar effect is expected to happen due to the presence of Gravity. We use WKB
appro... | [
{
"created": "Fri, 9 Dec 2022 10:39:04 GMT",
"version": "v1"
}
] | 2022-12-12 | [
[
"Kumar",
"Achal",
""
],
[
"Mukhopadhyay",
"Banibrata",
""
]
] | It is well-known that Dirac particles gain geometric phase, namely Berry phase, while moving in an electromagnetic field. Researchers have already shown covariant formalism for the Berry connection due to an electromagnetic field. A similar effect is expected to happen due to the presence of Gravity. We use WKB approxi... |
0902.3927 | Remo Garattini | Remo Garattini | Modified Dispersion Relations and Black Hole Entropy | LaTeX 12 Pages. Extended Version of the paper accepted for
publication in PLB. References added | Phys.Lett.B685:329-337,2010 | 10.1016/j.physletb.2010.02.012 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the black hole entropy in the context of the Modified Dispersion
Relations using the brick wall model. An explicit dependence of the radial
coordinate approaching the horizon is shown to analyze the behavior of the
divergence. We find that, due to the modification of the density of states, the
brick wall c... | [
{
"created": "Mon, 23 Feb 2009 15:19:19 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Feb 2010 12:56:35 GMT",
"version": "v2"
}
] | 2010-03-02 | [
[
"Garattini",
"Remo",
""
]
] | We compute the black hole entropy in the context of the Modified Dispersion Relations using the brick wall model. An explicit dependence of the radial coordinate approaching the horizon is shown to analyze the behavior of the divergence. We find that, due to the modification of the density of states, the brick wall can... |
1207.0912 | Alcides Garat | Alcides Garat | Tetrads in SU(3) X SU(2) X U(1) Yang-Mills geometrodynamics | There is a new appendix. The unitary transformations by local SU(2)
subgroup elements of a local group coset representative is proved to be a new
local group coset representative. This proof is relevant to the study of the
memory of the local tetrad SU(3) generated gauge transformations. Therefore,
it is also r... | Int.J.Geom.Meth.Mod.Phys. 15 (2017) no.03, 1850045 | 10.1142/S0219887818500457 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The relationship between gauge and gravity amounts to understanding
underlying new geometrical local structures. These structures are new tetrads
specially devised for Yang-Mills theories, Abelian and Non-Abelian in
four-dimensional Lorentzian spacetimes. In the present manuscript a new tetrad
is introduced for the Y... | [
{
"created": "Wed, 4 Jul 2012 06:42:58 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jul 2012 22:15:34 GMT",
"version": "v2"
}
] | 2019-08-22 | [
[
"Garat",
"Alcides",
""
]
] | The relationship between gauge and gravity amounts to understanding underlying new geometrical local structures. These structures are new tetrads specially devised for Yang-Mills theories, Abelian and Non-Abelian in four-dimensional Lorentzian spacetimes. In the present manuscript a new tetrad is introduced for the Yan... |
gr-qc/0402070 | Robert Bartnik | Robert Bartnik | Phase space for the Einstein equations | 33 pages, 0 figures, LaTeX2e, submitted to Comm Analysis and Geometry | null | null | null | gr-qc | null | A Hilbert manifold structure is described for the ADM phase space of
asymptotically flat initial data $(g,\pi)$ with local $H^2\times H^1$ Sobolev
regularity. Solutions of the constraint equations form a Hilbert submanifold. A
regularized RT Hamiltonian is defined and smooth on the full phase space and
generates the ... | [
{
"created": "Mon, 16 Feb 2004 00:51:38 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bartnik",
"Robert",
""
]
] | A Hilbert manifold structure is described for the ADM phase space of asymptotically flat initial data $(g,\pi)$ with local $H^2\times H^1$ Sobolev regularity. Solutions of the constraint equations form a Hilbert submanifold. A regularized RT Hamiltonian is defined and smooth on the full phase space and generates the Ei... |
2407.10939 | Bernardo Araneda | Bernardo Araneda | Teukolsky equations, twistor functions, and conformally self-dual spaces | 17 pages | null | null | null | gr-qc hep-th math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | We prove a correspondence, for Riemannian manifolds with self-dual Weyl
tensor, between twistor functions and solutions to the Teukolsky equations for
any conformal and spin weights. In particular, we give a contour integral
formula for solutions to the Teukolsky equations, and we find a recursion
operator that gener... | [
{
"created": "Mon, 15 Jul 2024 17:37:48 GMT",
"version": "v1"
}
] | 2024-07-16 | [
[
"Araneda",
"Bernardo",
""
]
] | We prove a correspondence, for Riemannian manifolds with self-dual Weyl tensor, between twistor functions and solutions to the Teukolsky equations for any conformal and spin weights. In particular, we give a contour integral formula for solutions to the Teukolsky equations, and we find a recursion operator that generat... |
2403.18673 | Anamaria Hell | Anamaria Hell | Unveiling the inconsistency of the Proca theory with non-minimal
coupling to gravity | 18 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the degrees of freedom of the Proca theory, non-minimally coupled to
gravity. In the Minkowski background, this theory propagates five degrees of
freedom - a massive longitudinal mode, two massive vector ones, and two
massless tensor modes. At first sight, the non-linear coupling between the
metric perturbat... | [
{
"created": "Wed, 27 Mar 2024 15:17:05 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Apr 2024 12:36:40 GMT",
"version": "v2"
}
] | 2024-04-05 | [
[
"Hell",
"Anamaria",
""
]
] | We study the degrees of freedom of the Proca theory, non-minimally coupled to gravity. In the Minkowski background, this theory propagates five degrees of freedom - a massive longitudinal mode, two massive vector ones, and two massless tensor modes. At first sight, the non-linear coupling between the metric perturbatio... |
2011.07971 | Yasser Elmahalawy | Alexander A. Andrianov, Artem Starodubtsev and Yasser Elmahalawy | Quantum Analysis of BTZ Black Hole Formation Due to the Collapse of a
Dust Shell | 19 pages, 3 figures | Universe 2020, 6(11), 201 | 10.3390/universe6110201 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We perform Hamiltonian reduction of a model in which 2+1 dimensional gravity
with negative cosmological constant is coupled to a cylindrically symmetric
dust shell. The resulting action contains only a finite number of degrees of
freedom. The phase space consists of two copies of $ADS^2$ -- both coordinate
and moment... | [
{
"created": "Mon, 16 Nov 2020 14:04:50 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Nov 2020 15:15:47 GMT",
"version": "v2"
}
] | 2020-11-19 | [
[
"Andrianov",
"Alexander A.",
""
],
[
"Starodubtsev",
"Artem",
""
],
[
"Elmahalawy",
"Yasser",
""
]
] | We perform Hamiltonian reduction of a model in which 2+1 dimensional gravity with negative cosmological constant is coupled to a cylindrically symmetric dust shell. The resulting action contains only a finite number of degrees of freedom. The phase space consists of two copies of $ADS^2$ -- both coordinate and momentum... |
gr-qc/0001046 | Carsten Gundlach | C. Gundlach | Critical phenomena in gravitational collapse - Living Reviews | 55 pages, published as Living Reviews 1999-4 | LivingRev.Rel.2:4,1999 | null | null | gr-qc | null | As first discovered by Choptuik, the black hole threshold in the space of
initial data for general relativity shows both surprising structure and
surprising simplicity. Universality, power-law scaling of the black hole mass,
and scale echoing have given rise to the term ``critical phenomena''. They are
explained by t... | [
{
"created": "Mon, 17 Jan 2000 02:14:02 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Gundlach",
"C.",
""
]
] | As first discovered by Choptuik, the black hole threshold in the space of initial data for general relativity shows both surprising structure and surprising simplicity. Universality, power-law scaling of the black hole mass, and scale echoing have given rise to the term ``critical phenomena''. They are explained by the... |
1002.1434 | Mubasher Jamil | Mubasher Jamil and M. Umar Farooq | Interacting holographic dark energy with logarithmic correction | 8 pages | JCAP 03 (2010) 001 | 10.1088/1475-7516/2010/03/001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The holographic dark energy (HDE) is considered to be the most promising
candidate of dark energy. Its definition is originally motivated from the
entropy-area relation which depends on the theory of gravity under
consideration. Recently a new definition of HDE is proposed with the help of
quantum corrections to the ... | [
{
"created": "Sun, 7 Feb 2010 07:35:29 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Mar 2010 14:54:41 GMT",
"version": "v2"
}
] | 2015-05-18 | [
[
"Jamil",
"Mubasher",
""
],
[
"Farooq",
"M. Umar",
""
]
] | The holographic dark energy (HDE) is considered to be the most promising candidate of dark energy. Its definition is originally motivated from the entropy-area relation which depends on the theory of gravity under consideration. Recently a new definition of HDE is proposed with the help of quantum corrections to the en... |
gr-qc/0009039 | Bertfried Fauser | Sergiu I. Vacaru and Heinz Dehnen | Locally Anisotropic Structures and Nonlinear Connections in Einstein and
Gauge Gravity | 37 pages | Gen.Rel.Grav. 35 (2003) 209-250 | 10.1023/A:1022388909622 | null | gr-qc | null | We analyze local anisotropies induced by anholonomic frames and associated
nonlinear connections in general relativity and extensions to affine Poincare
and de Sitter gauge gravity and different types of Kaluza-Klein theories. We
construct some new classes of cosmological solutions of gravitational field
equations de... | [
{
"created": "Tue, 12 Sep 2000 07:25:59 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Vacaru",
"Sergiu I.",
""
],
[
"Dehnen",
"Heinz",
""
]
] | We analyze local anisotropies induced by anholonomic frames and associated nonlinear connections in general relativity and extensions to affine Poincare and de Sitter gauge gravity and different types of Kaluza-Klein theories. We construct some new classes of cosmological solutions of gravitational field equations desc... |
gr-qc/9405009 | Peter Dunsby | Henk van Elst, Peter Dunsby and Reza Tavakol | Constraints on Inflationary Solutions in the Presence of Shear and Bulk
Viscosity | 21 pages, LaTeX | Gen.Rel.Grav.27:171-191,1995 | 10.1007/BF02107957 | null | gr-qc | null | Inflationary models and their claim to solve many of the outstanding problems
in cosmology have been the subject of a great deal of debate over the last few
years. A major sticking point has been the lack of both good observational and
theoretical arguments to single out one particular model out of the many that
solv... | [
{
"created": "Wed, 4 May 1994 18:14:49 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"van Elst",
"Henk",
""
],
[
"Dunsby",
"Peter",
""
],
[
"Tavakol",
"Reza",
""
]
] | Inflationary models and their claim to solve many of the outstanding problems in cosmology have been the subject of a great deal of debate over the last few years. A major sticking point has been the lack of both good observational and theoretical arguments to single out one particular model out of the many that solve ... |
2201.01817 | Joseph Gais | Joseph Gais, Ken Ng, Eungwang Seo, Kaze W.K. Wong, Tjonnie G. F. Li | Inferring the Intermediate Mass Black Hole Number Density from
Gravitational Wave Lensing Statistics | null | null | 10.3847/2041-8213/ac7052 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The population properties of intermediate mass black holes remain largely
unknown, and understanding their distribution could provide a missing link in
the formation of supermassive black holes and galaxies. Gravitational wave
observations can help fill in the gap from stellar mass black holes to
supermassive black h... | [
{
"created": "Wed, 5 Jan 2022 20:58:18 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Jan 2022 17:40:48 GMT",
"version": "v2"
}
] | 2022-06-22 | [
[
"Gais",
"Joseph",
""
],
[
"Ng",
"Ken",
""
],
[
"Seo",
"Eungwang",
""
],
[
"Wong",
"Kaze W. K.",
""
],
[
"Li",
"Tjonnie G. F.",
""
]
] | The population properties of intermediate mass black holes remain largely unknown, and understanding their distribution could provide a missing link in the formation of supermassive black holes and galaxies. Gravitational wave observations can help fill in the gap from stellar mass black holes to supermassive black hol... |
2207.13624 | Hamza Boumaza | Hamza Boumaza and David Langlois | Neutron stars in degenerate higher-order scalar-tensor theories | null | null | 10.1103/PhysRevD.106.084053 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study neutron star configurations in a simple shift-symmetric subfamily of
degenerate higher-order scalar-tensor (DHOST) theories, whose deviations from
General Relativity (GR) are characterized by a single parameter. We compute the
radial profiles of neutron stars in these theories of modified gravity, using
seve... | [
{
"created": "Wed, 27 Jul 2022 16:36:17 GMT",
"version": "v1"
}
] | 2022-11-09 | [
[
"Boumaza",
"Hamza",
""
],
[
"Langlois",
"David",
""
]
] | We study neutron star configurations in a simple shift-symmetric subfamily of degenerate higher-order scalar-tensor (DHOST) theories, whose deviations from General Relativity (GR) are characterized by a single parameter. We compute the radial profiles of neutron stars in these theories of modified gravity, using severa... |
1308.2877 | Babak Vakili | Babak Vakili and Shahram Jalalzadeh | Signature transition in Einstein-Cartan cosmology | 9 pages, typos corrected | Phys. Lett. B 726 (2013) 28 | 10.1016/j.physletb.2013.08.036 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of Einstein-Cartan theory of gravity, we consider a
Friedmann-Lemaitre-Robertson-Walker (FLRW) cosmological model with Weyssenhoff
perfect fluid. We focus attention on those classical solutions that admit a
degenerate metric in which the scale factor has smooth behavior in the
transition from a Euclide... | [
{
"created": "Tue, 13 Aug 2013 14:23:46 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Sep 2013 06:41:09 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Vakili",
"Babak",
""
],
[
"Jalalzadeh",
"Shahram",
""
]
] | In the context of Einstein-Cartan theory of gravity, we consider a Friedmann-Lemaitre-Robertson-Walker (FLRW) cosmological model with Weyssenhoff perfect fluid. We focus attention on those classical solutions that admit a degenerate metric in which the scale factor has smooth behavior in the transition from a Euclidean... |
gr-qc/0206079 | Giuseppina Modestino | P. Astone, D. Babusci, M. Bassan, P. Bonifazi, P. Carelli, E. Coccia,
S. D'Antonio, V. Fafone, G. Giordano, A. Marini, G. Mazzitelli, Y. Minenkov,
I.Modena, G. Modestino, A.Moleti, G.V. Pallottino, G. Pizzella, L. Quintieri,
A. Rocchi, F. Ronga, R. Terenzi, M. Visco | Effect of cosmic rays on the resonant gravitational wave detector
NAUTILUS at temperature T=1.5 K | 7 pages, 3 figures, 2 tables. Accepted by Physics Letters B | Phys.Lett.B540:179-184,2002 | 10.1016/S0370-2693(02)02143-3 | null | gr-qc | null | The interaction between cosmic rays and the gravitational wave bar detector
NAUTILUS is experimentally studied with the aluminum bar at temperature of
T=1.5 K. The results are compared with those obtained in the previous runs when
the bar was at T=0.14 K. The results of the run at T = 1.5 K are in agreement
with the ... | [
{
"created": "Wed, 26 Jun 2002 15:34:59 GMT",
"version": "v1"
}
] | 2011-08-17 | [
[
"Astone",
"P.",
""
],
[
"Babusci",
"D.",
""
],
[
"Bassan",
"M.",
""
],
[
"Bonifazi",
"P.",
""
],
[
"Carelli",
"P.",
""
],
[
"Coccia",
"E.",
""
],
[
"D'Antonio",
"S.",
""
],
[
"Fafone",
"V.",
... | The interaction between cosmic rays and the gravitational wave bar detector NAUTILUS is experimentally studied with the aluminum bar at temperature of T=1.5 K. The results are compared with those obtained in the previous runs when the bar was at T=0.14 K. The results of the run at T = 1.5 K are in agreement with the th... |
gr-qc/0309008 | Alfredo Macias | A. Garcia, F.W. Hehl, C. Heinicke, and A. Macias | The Cotton tensor in Riemannian spacetimes | 27 pages, revtex4 | Class.Quant.Grav. 21 (2004) 1099-1118 | 10.1088/0264-9381/21/4/024 | null | gr-qc | null | Recently, the study of three-dimensional spaces is becoming of great
interest. In these dimensions the Cotton tensor is prominent as the substitute
for the Weyl tensor. It is conformally invariant and its vanishing is
equivalent to conformal flatness. However, the Cotton tensor arises in the
context of the Bianchi id... | [
{
"created": "Mon, 1 Sep 2003 23:09:48 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Feb 2004 20:02:06 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Garcia",
"A.",
""
],
[
"Hehl",
"F. W.",
""
],
[
"Heinicke",
"C.",
""
],
[
"Macias",
"A.",
""
]
] | Recently, the study of three-dimensional spaces is becoming of great interest. In these dimensions the Cotton tensor is prominent as the substitute for the Weyl tensor. It is conformally invariant and its vanishing is equivalent to conformal flatness. However, the Cotton tensor arises in the context of the Bianchi iden... |
0806.0981 | Joel Saavedra | Samuel Lepe, Francisco Pena and Joel Saavedra | Holographic Cosmological Models on the Braneworld | null | Phys.Lett.B671:323-326,2009 | 10.1016/j.physletb.2008.12.048 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we have studied a closed universe which a holographic energy
on the brane whose energy density is described by $\rho (H) =3c^{2}H^{2}$ and
we obtain an equation for the Hubble parameter, this equation gave us different
physical behavior depending if $c^2>1$ or $c^2<1$ against of the sign of the
brane ... | [
{
"created": "Thu, 5 Jun 2008 14:35:57 GMT",
"version": "v1"
}
] | 2009-02-02 | [
[
"Lepe",
"Samuel",
""
],
[
"Pena",
"Francisco",
""
],
[
"Saavedra",
"Joel",
""
]
] | In this article we have studied a closed universe which a holographic energy on the brane whose energy density is described by $\rho (H) =3c^{2}H^{2}$ and we obtain an equation for the Hubble parameter, this equation gave us different physical behavior depending if $c^2>1$ or $c^2<1$ against of the sign of the brane te... |
2205.14868 | Titus K Mathew | P. B. Krishna, Hassan Basari V. T., and Titus K Mathew | Emergence of cosmic space and its connection with thermodynamic
principles | 32 pages - review article | null | 10.1007/s10714-022-02941-4 | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | The recent research on the connection between gravity and thermodynamics
suggests that gravity could be an emergent phenomenon. Following this,
Padmanabhan proposed a novel idea that the expansion of the universe can be
interpreted as equivalent to the emergence of space with the progress of cosmic
time. In this appr... | [
{
"created": "Mon, 30 May 2022 06:13:53 GMT",
"version": "v1"
}
] | 2022-06-22 | [
[
"Krishna",
"P. B.",
""
],
[
"T.",
"Hassan Basari V.",
""
],
[
"Mathew",
"Titus K",
""
]
] | The recent research on the connection between gravity and thermodynamics suggests that gravity could be an emergent phenomenon. Following this, Padmanabhan proposed a novel idea that the expansion of the universe can be interpreted as equivalent to the emergence of space with the progress of cosmic time. In this approa... |
1609.00386 | Richard Woodard | D. Glavan, S. P. Miao, Tomislav Prokopec and R. P. Woodard | One loop graviton corrections to dynamical photons in de Sitter | 41 pages, no figures, uses LaTeX2e | null | 10.1088/1361-6382/aa61da | UFIFT-QG-16-06 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We employ a recent, general gauge computation of the one loop graviton
contribution to the vacuum polarization on de Sitter to solve for one loop
corrections to the photon mode function. The vacuum polarization takes the form
of a gauge independent, spin 2 contribution and a gauge dependent, spin 0
contribution. We s... | [
{
"created": "Thu, 1 Sep 2016 20:01:44 GMT",
"version": "v1"
}
] | 2017-03-29 | [
[
"Glavan",
"D.",
""
],
[
"Miao",
"S. P.",
""
],
[
"Prokopec",
"Tomislav",
""
],
[
"Woodard",
"R. P.",
""
]
] | We employ a recent, general gauge computation of the one loop graviton contribution to the vacuum polarization on de Sitter to solve for one loop corrections to the photon mode function. The vacuum polarization takes the form of a gauge independent, spin 2 contribution and a gauge dependent, spin 0 contribution. We sho... |
2311.14377 | Yili Wang | Daniele Oriti, Yi-Li Wang | Effective anisotropic dynamics in Group Field Theory cosmology | 34 pages, 16 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the emergent dynamics of an anisotropic universe in the context of
Group Field Theory condensate cosmology, with a scalar field playing the role
of a relational clock. According to different definitions of ``isotropy'', two
anisotropic condensate states are considered and the Bianchi-like dynamics of
cosmolo... | [
{
"created": "Fri, 24 Nov 2023 09:52:27 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Jul 2024 07:10:22 GMT",
"version": "v2"
}
] | 2024-07-24 | [
[
"Oriti",
"Daniele",
""
],
[
"Wang",
"Yi-Li",
""
]
] | We study the emergent dynamics of an anisotropic universe in the context of Group Field Theory condensate cosmology, with a scalar field playing the role of a relational clock. According to different definitions of ``isotropy'', two anisotropic condensate states are considered and the Bianchi-like dynamics of cosmologi... |
1504.02912 | Sridip Pal | Sridip Pal | Physical Aspects of Unitary evolution of Bianchi-I Quantum Cosmological
Model | 11 pages, 3 figures | Class. Quantum Grav. 33 045007, 2016 | 10.1088/0264-9381/33/4/045007 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we study some physical aspects of unitary evolution of
Bianchi-I model. In particular, we study the behavior of the volume and the
scale factor as a function of time for the Bianchi-I universe with
ultra-relativistic fluid ($\alpha=1$). The expectation value of volume is shown
not to hit any singularity... | [
{
"created": "Sat, 11 Apr 2015 20:01:05 GMT",
"version": "v1"
}
] | 2016-01-28 | [
[
"Pal",
"Sridip",
""
]
] | In this work, we study some physical aspects of unitary evolution of Bianchi-I model. In particular, we study the behavior of the volume and the scale factor as a function of time for the Bianchi-I universe with ultra-relativistic fluid ($\alpha=1$). The expectation value of volume is shown not to hit any singularity. ... |
1908.01888 | Andrey Saveliev | Petar Pavlovi\'c, Andrey Saveliev, Marko Sossich | Influence of the Vacuum Polarization Effect on the Motion of Charged
Particles in the Magnetic Field around a Schwarzschild Black Hole | 12 pages, 4 figures; minor changes to match published version | Phys. Rev. D 100, 084033 (2019) | 10.1103/PhysRevD.100.084033 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The consequences of the vacuum polarization effect in magnetic fields around
a Schwarzschild Black Hole on the motion of charged particles are investigated
in this work. Using the weak electromagnetic field approximation, we discuss
the non-minimal coupling between magnetic fields and gravity caused by the
vacuum pol... | [
{
"created": "Mon, 5 Aug 2019 22:31:44 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Oct 2019 22:57:54 GMT",
"version": "v2"
}
] | 2019-10-17 | [
[
"Pavlović",
"Petar",
""
],
[
"Saveliev",
"Andrey",
""
],
[
"Sossich",
"Marko",
""
]
] | The consequences of the vacuum polarization effect in magnetic fields around a Schwarzschild Black Hole on the motion of charged particles are investigated in this work. Using the weak electromagnetic field approximation, we discuss the non-minimal coupling between magnetic fields and gravity caused by the vacuum polar... |
2112.10817 | Laura Sinclair | Andrei Derevianko, Kurt Gibble, Leo Hollberg, Nathan R. Newbury, Chris
Oates, Marianna S. Safronova, Laura C. Sinclair, and Nan Yu | Fundamental Physics with a State-of-the-Art Optical Clock in Space | null | null | null | null | gr-qc physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent advances in optical atomic clocks and optical time transfer have
enabled new possibilities in precision metrology for both tests of fundamental
physics and timing applications. Here we describe a space mission concept that
would place a state-of-the-art optical atomic clock in an eccentric orbit
around Earth. ... | [
{
"created": "Mon, 20 Dec 2021 19:25:54 GMT",
"version": "v1"
}
] | 2021-12-22 | [
[
"Derevianko",
"Andrei",
""
],
[
"Gibble",
"Kurt",
""
],
[
"Hollberg",
"Leo",
""
],
[
"Newbury",
"Nathan R.",
""
],
[
"Oates",
"Chris",
""
],
[
"Safronova",
"Marianna S.",
""
],
[
"Sinclair",
"Laura C.",
""
... | Recent advances in optical atomic clocks and optical time transfer have enabled new possibilities in precision metrology for both tests of fundamental physics and timing applications. Here we describe a space mission concept that would place a state-of-the-art optical atomic clock in an eccentric orbit around Earth. A ... |
1605.06244 | Parthapratim Pradhan | Parthapratim Pradhan | Circular Orbits in the Taub-NUT and mass-less Taub-NUT Space-time | Version accepted in International Journal of Geometric Methods in
Modern Physics | International Journal of Geometric Methods in Modern Physics, Vol.
14 (2017) 1750101 | 10.1142/S0219887817501018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study the equatorial causal geodesics of the Taub-NUT (TN)
space-time in comparison with \emph{mass-less} TN space-time. We emphasized
both on the null circular geodesics and time-like circular geodesics. From the
effective potential diagram of null and time-like geodesics, we differentiate
the geodes... | [
{
"created": "Fri, 20 May 2016 08:43:14 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Oct 2016 19:11:30 GMT",
"version": "v2"
},
{
"created": "Thu, 20 Apr 2017 16:24:19 GMT",
"version": "v3"
}
] | 2017-04-21 | [
[
"Pradhan",
"Parthapratim",
""
]
] | In this work we study the equatorial causal geodesics of the Taub-NUT (TN) space-time in comparison with \emph{mass-less} TN space-time. We emphasized both on the null circular geodesics and time-like circular geodesics. From the effective potential diagram of null and time-like geodesics, we differentiate the geodesic... |
1005.1383 | Khalid Saifullah | Asghar Qadir, K. Saifullah | Comments on matter collineations of plane symmetric, cylindrically
symmetric and spherically symmetric spacetimes | null | J. Math. Phys. 45 (2004) 4191 | 10.1063/1.1793331 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Comments are made on some recently published papers on matter collineations
of plane symmetric, cylindrically symmetric and spherically symmetric
spacetimes.
| [
{
"created": "Sun, 9 May 2010 11:12:49 GMT",
"version": "v1"
}
] | 2015-05-18 | [
[
"Qadir",
"Asghar",
""
],
[
"Saifullah",
"K.",
""
]
] | Comments are made on some recently published papers on matter collineations of plane symmetric, cylindrically symmetric and spherically symmetric spacetimes. |
0704.1734 | Alan Coley | A.A. Coley | Averaging and Cosmological Observations | 9 pages | null | null | null | gr-qc astro-ph hep-th | null | The gravitational field equations on cosmological scales are obtained by
averaging the Einstein field equations of general relativity. By assuming
spatial homogeneity and isotropy on the largest scales, the local
inhomogeneities affect the dynamics though correction (backreaction) terms,
which can lead to behaviour q... | [
{
"created": "Fri, 13 Apr 2007 17:36:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Coley",
"A. A.",
""
]
] | The gravitational field equations on cosmological scales are obtained by averaging the Einstein field equations of general relativity. By assuming spatial homogeneity and isotropy on the largest scales, the local inhomogeneities affect the dynamics though correction (backreaction) terms, which can lead to behaviour qua... |
0708.3353 | Guy D. Moore | Jonathan W. Sharman, Guy D. Moore | Decoherence due to the Horizon after Inflation | 11 pages | JCAP0711:020,2007 | 10.1088/1475-7516/2007/11/020 | null | gr-qc astro-ph | null | The fluctuations in the inflaton field at the end of inflation which seed the
density perturbations are prepared in a pure quantum state. It is generally
assumed that some physics causes this pure state to decohere so that it should
be treated probabilistically. We show that the entanglement entropy between the
unive... | [
{
"created": "Fri, 24 Aug 2007 15:00:59 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Sharman",
"Jonathan W.",
""
],
[
"Moore",
"Guy D.",
""
]
] | The fluctuations in the inflaton field at the end of inflation which seed the density perturbations are prepared in a pure quantum state. It is generally assumed that some physics causes this pure state to decohere so that it should be treated probabilistically. We show that the entanglement entropy between the univers... |
2310.13578 | Angelica Albertini | Angelica Albertini, Rossella Gamba, Alessandro Nagar, Sebastiano
Bernuzzi | Effective-one-body waveforms for extreme-mass-ratio binaries:
Consistency with second-order gravitational self-force quasicircular results
and extension to nonprecessing spins and eccentricity | 9 pages, 6 figures | Phys. Rev. D 109 (2024) 4, 044022 | 10.1103/PhysRevD.109.044022 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a first complete implementation of an effective-one-body (EOB)
model for extreme-mass-ratio inspirals (EMRIs) that incorporates aligned spins
(on both the primary and the secondary) as well as orbital eccentricity. The
model extends TEOBResumS-Dal\'i for these binaries by (i) recasting
conservative first-o... | [
{
"created": "Fri, 20 Oct 2023 15:18:06 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Feb 2024 08:54:19 GMT",
"version": "v2"
}
] | 2024-02-20 | [
[
"Albertini",
"Angelica",
""
],
[
"Gamba",
"Rossella",
""
],
[
"Nagar",
"Alessandro",
""
],
[
"Bernuzzi",
"Sebastiano",
""
]
] | We present a first complete implementation of an effective-one-body (EOB) model for extreme-mass-ratio inspirals (EMRIs) that incorporates aligned spins (on both the primary and the secondary) as well as orbital eccentricity. The model extends TEOBResumS-Dal\'i for these binaries by (i) recasting conservative first-ord... |
2110.00205 | Tie-Jun Gao | Tie-Jun Gao | NANOGrav Signal from double-inflection-point inflation and dark matter | null | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The NANOGrav collaboration has published a suspected stochastic GW background
signal in its analysis of 12.5 years PTA data, so in this work, we investigate
the possibility to explain the signal by the inflationary models with
double-inflection-point. We calculate the energy spectrum of GWs induced by
scalar perturba... | [
{
"created": "Fri, 1 Oct 2021 04:25:14 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Oct 2021 02:30:10 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Nov 2021 13:47:21 GMT",
"version": "v3"
},
{
"created": "Fri, 10 Mar 2023 00:32:52 GMT",
"version": "v4"
}
] | 2023-03-13 | [
[
"Gao",
"Tie-Jun",
""
]
] | The NANOGrav collaboration has published a suspected stochastic GW background signal in its analysis of 12.5 years PTA data, so in this work, we investigate the possibility to explain the signal by the inflationary models with double-inflection-point. We calculate the energy spectrum of GWs induced by scalar perturbati... |
2212.03051 | Haryanto Siahaan | Haryanto M. Siahaan | Charged Taub-NUT-de Sitter spacetime in DGP braneworld and its
thermodynamics | 16 pages, no figure. To be published in Chinese Physics C | null | 10.1088/1674-1137/aca95e | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study a charged Taub-NUT spacetime solution in the DGP brane. We show that
the Reissner-Nordstrom-Taub-NUT-de Sitter solution of Einstein-Maxwell gravity
solves the corresponding equations of motion, where the cosmological constant
is related to the cross-over scale in the DGP model. Following the approach by
Teit... | [
{
"created": "Tue, 6 Dec 2022 15:28:40 GMT",
"version": "v1"
}
] | 2023-02-15 | [
[
"Siahaan",
"Haryanto M.",
""
]
] | We study a charged Taub-NUT spacetime solution in the DGP brane. We show that the Reissner-Nordstrom-Taub-NUT-de Sitter solution of Einstein-Maxwell gravity solves the corresponding equations of motion, where the cosmological constant is related to the cross-over scale in the DGP model. Following the approach by Teitel... |
1804.01779 | Sunil Maurya DR. | J. Kumar, S. K. Maurya, A. K. Prasad, Ayan Banerjee | Relativistic charged spheres: Compact stars, compactness and stable
configurations | 13 pages, 4 figures | null | 10.1088/1475-7516/2019/11/005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper aims to explore a class of static stellar equilibrium
configuration of relativistic charged spheres made of a charged perfect fluid.
Solving the Einstein-Maxwell field equations, we consider a particularized
metric potential, Buchdahl ansatz [ Phys. Rev.116, 1027 (1959)] and then by
using a simple transfor... | [
{
"created": "Thu, 5 Apr 2018 11:02:38 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Apr 2018 06:51:47 GMT",
"version": "v2"
},
{
"created": "Fri, 9 Nov 2018 08:58:36 GMT",
"version": "v3"
},
{
"created": "Sun, 4 Aug 2019 10:39:20 GMT",
"version": "v4"
}
] | 2021-05-11 | [
[
"Kumar",
"J.",
""
],
[
"Maurya",
"S. K.",
""
],
[
"Prasad",
"A. K.",
""
],
[
"Banerjee",
"Ayan",
""
]
] | This paper aims to explore a class of static stellar equilibrium configuration of relativistic charged spheres made of a charged perfect fluid. Solving the Einstein-Maxwell field equations, we consider a particularized metric potential, Buchdahl ansatz [ Phys. Rev.116, 1027 (1959)] and then by using a simple transforma... |
gr-qc/9509042 | Biplab Bhawal | Biplab Bhawal and S.V. Dhurandhar | Coincidence detection of broadband signals by networks of the planned
interferometric gravitational wave detectors | 20 pages; RevTex; plus four figures uuencoded | null | null | IUCAA-29/95 | gr-qc | null | We describe how the six planned detectors (2 LIGOs, VIRGO, GEO, AIGO, TAMA)
can be used to perform coincidence experiments for the detection of broadband
signals from either coalescing compact binaries or burst sources. We make
comparisons of the achievable sensitivities of these detectors under different
optical con... | [
{
"created": "Fri, 22 Sep 1995 23:28:41 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bhawal",
"Biplab",
""
],
[
"Dhurandhar",
"S. V.",
""
]
] | We describe how the six planned detectors (2 LIGOs, VIRGO, GEO, AIGO, TAMA) can be used to perform coincidence experiments for the detection of broadband signals from either coalescing compact binaries or burst sources. We make comparisons of the achievable sensitivities of these detectors under different optical confi... |
2407.13601 | Johanna N. Borissova | Johanna Borissova, Bianca Dittrich, Dongxue Qu, Marc Schiffer | Spikes and spines in 4D Lorentzian simplicial quantum gravity | v1: 32 pages, 13 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Simplicial approaches to quantum gravity such as quantum Regge calculus and
spin foams include configurations where bulk edges can become arbitrarily large
while the boundary edges are kept small. Spikes and spines are prime examples
for such configurations. They pose a significant challenge for a desired
continuum l... | [
{
"created": "Thu, 18 Jul 2024 15:39:43 GMT",
"version": "v1"
}
] | 2024-07-19 | [
[
"Borissova",
"Johanna",
""
],
[
"Dittrich",
"Bianca",
""
],
[
"Qu",
"Dongxue",
""
],
[
"Schiffer",
"Marc",
""
]
] | Simplicial approaches to quantum gravity such as quantum Regge calculus and spin foams include configurations where bulk edges can become arbitrarily large while the boundary edges are kept small. Spikes and spines are prime examples for such configurations. They pose a significant challenge for a desired continuum lim... |
gr-qc/9909053 | Sameer Gupta | Matthias Arnsdorf and Sameer Gupta | Loop Quantum Gravity on Non-Compact Spaces | Revised version, portions of the paper rearranged, references added | Nucl.Phys. B577 (2000) 529-546 | 10.1016/S0550-3213(00)00196-6 | CGPG-99/9-4 | gr-qc | null | We present a general procedure for constructing new Hilbert spaces for loop
quantum gravity on non-compact spatial manifolds. Given any fixed background
state representing a non-compact spatial geometry, we use the
Gel'fand-Naimark-Segal construction to obtain a representation of the algebra
of observables. The resul... | [
{
"created": "Thu, 16 Sep 1999 22:48:40 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Apr 2000 18:03:06 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Arnsdorf",
"Matthias",
""
],
[
"Gupta",
"Sameer",
""
]
] | We present a general procedure for constructing new Hilbert spaces for loop quantum gravity on non-compact spatial manifolds. Given any fixed background state representing a non-compact spatial geometry, we use the Gel'fand-Naimark-Segal construction to obtain a representation of the algebra of observables. The resulti... |
2305.05185 | Masato Minamitsuji | Masato Minamitsuji and Shinji Mukohyama | Instability of scalarized compact objects in
Einstein-scalar-Gauss-Bonnet theories | 14 pages, references added, accepted for publication in PRD | null | 10.1103/PhysRevD.108.024029 | YITP-23-62, IPMU23-0013 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the linear stability of scalarized black holes (BHs) and
neutron stars (NSs) in the Einstein-scalar-Gauss-Bonnet (GB) theories against
the odd- and even-parity perturbations including the higher multipole modes. We
show that the angular propagation speeds in the even-parity perturbations in
the $\ell \... | [
{
"created": "Tue, 9 May 2023 05:44:22 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Jun 2023 22:57:15 GMT",
"version": "v2"
}
] | 2023-07-26 | [
[
"Minamitsuji",
"Masato",
""
],
[
"Mukohyama",
"Shinji",
""
]
] | We investigate the linear stability of scalarized black holes (BHs) and neutron stars (NSs) in the Einstein-scalar-Gauss-Bonnet (GB) theories against the odd- and even-parity perturbations including the higher multipole modes. We show that the angular propagation speeds in the even-parity perturbations in the $\ell \to... |
0811.2471 | Peter Collas | Peter Collas and David Klein | Frame dragging anomalies for rotating bodies | This version adds minor clarifications to the original published
version of this paper, which among other things remove the source of Culetu's
objections in arXiv:0811.4592. In addition, a reference is added with further
acknowledgments | Gen.Rel.Grav.36:1197,2004 | 10.1023/B:GERG.0000018286.98387.64 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Examples of axially symmetric solutions to Einstein's field equations are
given that exhibit anomalous "negative frame dragging" in the sense that zero
angular momentum test particles acquire angular velocities in the opposite
direction of rotation from the source of the metric.
| [
{
"created": "Sat, 15 Nov 2008 09:48:05 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Dec 2008 23:40:24 GMT",
"version": "v2"
}
] | 2008-12-18 | [
[
"Collas",
"Peter",
""
],
[
"Klein",
"David",
""
]
] | Examples of axially symmetric solutions to Einstein's field equations are given that exhibit anomalous "negative frame dragging" in the sense that zero angular momentum test particles acquire angular velocities in the opposite direction of rotation from the source of the metric. |
0807.4428 | Orchidea Maria Lecian | O.M. Lecian, G. Montani | Implications of non-analytical f(R) gravity at Solar-System scales | 9 pages, no figures | Class.Quant.Grav.26:045014,2009 | 10.1088/0264-9381/26/4/045014 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We motivate and analyze the weak-field limit of a non-analytical Lagrangian
for the gravitational field. After investigating the parameter space of the
model, we impose constraints on the parameters characterizing this class of
theories imposed by Solar-System data, i.e. we establish the validity range
where this sol... | [
{
"created": "Mon, 28 Jul 2008 12:26:42 GMT",
"version": "v1"
}
] | 2009-02-12 | [
[
"Lecian",
"O. M.",
""
],
[
"Montani",
"G.",
""
]
] | We motivate and analyze the weak-field limit of a non-analytical Lagrangian for the gravitational field. After investigating the parameter space of the model, we impose constraints on the parameters characterizing this class of theories imposed by Solar-System data, i.e. we establish the validity range where this solut... |
2304.13079 | Zeeshan Gul | M. Zeeshan Gul and M. Sharif | Traversable Wormhole Solutions admitting Noether Symmetry in
$f(\mathcal{R,}\mathcal{T}^{2})$ Theory | 33 pages, 12 figures | Symmetry 15(2023)684 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper uses the Noether symmetry approach to examine the viable and
stable traversable wormhole solutions in the framework of
$f(\mathcal{R,}\mathcal{T}^{2})$ theory, where $\mathcal{R}$ is the Ricci
scalar and $\mathcal{T}^{2}=\mathcal{T}_{\mu\nu}\mathcal{T}^{\mu\nu}$ is the
self-contraction of stress-energy ten... | [
{
"created": "Wed, 19 Apr 2023 04:10:14 GMT",
"version": "v1"
}
] | 2023-04-27 | [
[
"Gul",
"M. Zeeshan",
""
],
[
"Sharif",
"M.",
""
]
] | This paper uses the Noether symmetry approach to examine the viable and stable traversable wormhole solutions in the framework of $f(\mathcal{R,}\mathcal{T}^{2})$ theory, where $\mathcal{R}$ is the Ricci scalar and $\mathcal{T}^{2}=\mathcal{T}_{\mu\nu}\mathcal{T}^{\mu\nu}$ is the self-contraction of stress-energy tenso... |
0805.1017 | Leonardo Gualtieri | L. Gualtieri, E. Berti, V. Cardoso, U. Sperhake | Transformation of the multipolar components of gravitational radiation
under rotations and boosts | 25 pages, 5 figures, revtex4; transformations under rotations
generalized to all values of l; to appear on Phys. Rev. D | Phys.Rev.D78:044024,2008 | 10.1103/PhysRevD.78.044024 | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the transformation of multipolar decompositions of gravitational
radiation under rotations and boosts. Rotations to the remnant black hole's
frame simplify the waveforms from the merger of generic spinning black hole
binaries. Boosts may be important to get an accurate gravitational-wave
phasing, especially ... | [
{
"created": "Wed, 7 May 2008 16:48:11 GMT",
"version": "v1"
},
{
"created": "Sat, 26 Jul 2008 15:09:03 GMT",
"version": "v2"
}
] | 2010-05-12 | [
[
"Gualtieri",
"L.",
""
],
[
"Berti",
"E.",
""
],
[
"Cardoso",
"V.",
""
],
[
"Sperhake",
"U.",
""
]
] | We study the transformation of multipolar decompositions of gravitational radiation under rotations and boosts. Rotations to the remnant black hole's frame simplify the waveforms from the merger of generic spinning black hole binaries. Boosts may be important to get an accurate gravitational-wave phasing, especially fo... |
1901.11415 | Yan Peng | Yan Peng | No hair theorem for spherically symmetric regular compact stars with
Dirichlet boundary conditions | 9 pages, 1 figure | Physics Letters B 792(2019)156-159 | 10.1016/j.physletb.2019.03.040 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study scalar condensation in the background of asymptotically flat
spherically symmetric regular Dirichlet stars. We assume that the scalar field
decreases as the star surface is approached. Under these circumstances, we
prove a no hair theorem for neutral regular compact stars. We also extend the
discussion to ch... | [
{
"created": "Thu, 31 Jan 2019 15:08:38 GMT",
"version": "v1"
},
{
"created": "Sun, 10 Feb 2019 05:33:27 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Mar 2019 04:02:11 GMT",
"version": "v3"
}
] | 2019-04-08 | [
[
"Peng",
"Yan",
""
]
] | We study scalar condensation in the background of asymptotically flat spherically symmetric regular Dirichlet stars. We assume that the scalar field decreases as the star surface is approached. Under these circumstances, we prove a no hair theorem for neutral regular compact stars. We also extend the discussion to char... |
1812.09945 | Adrian Ciprian Sporea | Ciprian A. Sporea | Scattering of quantum fields by a MOG Black Hole | 13 pages, 6 figures. Version accepted for publication in Mod. Phys.
Lett. A | null | 10.1142/S0217732320501217 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper aims to investigate the scattering of fermions by spherically
symmetric MOG black holes, which are a type of black holes encountered in
scalar-tensor-vector modified gravitational theories. After determining the
scattering modes in this black hole geometry, we apply the partial wave method
to compute analy... | [
{
"created": "Mon, 24 Dec 2018 16:00:38 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Nov 2019 14:56:15 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Feb 2020 10:38:43 GMT",
"version": "v3"
}
] | 2020-02-27 | [
[
"Sporea",
"Ciprian A.",
""
]
] | This paper aims to investigate the scattering of fermions by spherically symmetric MOG black holes, which are a type of black holes encountered in scalar-tensor-vector modified gravitational theories. After determining the scattering modes in this black hole geometry, we apply the partial wave method to compute analyti... |
gr-qc/0511093 | James L. Anderson | James L. Anderson | Approximate Equations of Motion for Compact Spinning Bodies in General
Relativity | typos repaired, cosmetic cleanup. Added paragraph describing results
of spin-spin interaction calculation | null | null | null | gr-qc | null | Approximate equations are derived for the motion of a gyroscope on the
earth's gravitational field using the Einstein, Infeld, Hoffmann surface
integral method. This method does not require a knowledge of the
energy-momentum-stress tensor associated with the gyroscope and uses only its
exterior field for its characte... | [
{
"created": "Wed, 16 Nov 2005 21:08:54 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Nov 2005 21:04:44 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Anderson",
"James L.",
""
]
] | Approximate equations are derived for the motion of a gyroscope on the earth's gravitational field using the Einstein, Infeld, Hoffmann surface integral method. This method does not require a knowledge of the energy-momentum-stress tensor associated with the gyroscope and uses only its exterior field for its characteri... |
1505.06585 | Prado Martin-Moruno | Prado Martin-Moruno, Nelson J. Nunes | Accelerating universe as a result of an adjustment mechanism | 7 pages, 2 figures. Essay awarded honorable mention in the Gravity
Research Foundation essay competition 2015 | Int. J. Mod. Phys. D 24, 1544018 (2015) | 10.1142/S0218271815440186 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this essay we propose that the theory of gravity's vacuum is described by
a de Sitter geometry. Under this assumption we consider an adjustment mechanism
able to screen any value of the vacuum energy of the matter fields. We discuss
the most general scalar-tensor cosmological models with second order equations
of ... | [
{
"created": "Mon, 25 May 2015 10:07:12 GMT",
"version": "v1"
}
] | 2015-12-02 | [
[
"Martin-Moruno",
"Prado",
""
],
[
"Nunes",
"Nelson J.",
""
]
] | In this essay we propose that the theory of gravity's vacuum is described by a de Sitter geometry. Under this assumption we consider an adjustment mechanism able to screen any value of the vacuum energy of the matter fields. We discuss the most general scalar-tensor cosmological models with second order equations of mo... |
0707.0428 | Reinhard Prix | Reinhard Prix | Template-based searches for gravitational waves: efficient lattice
covering of flat parameter spaces | 10 pages, submitted to CQG for proceedings of GWDAW11 | Class.Quant.Grav.24:S481-S490,2007 | 10.1088/0264-9381/24/19/S11 | LIGO-P070030-02-Z | gr-qc | null | The construction of optimal template banks for matched-filtering searches is
an example of the sphere covering problem. For parameter spaces with
constant-coefficient metrics a (near-) optimal template bank is achieved by the
A_n* lattice, which is the best lattice-covering in dimensions n <= 5, and is
close to the b... | [
{
"created": "Tue, 3 Jul 2007 14:51:29 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Prix",
"Reinhard",
""
]
] | The construction of optimal template banks for matched-filtering searches is an example of the sphere covering problem. For parameter spaces with constant-coefficient metrics a (near-) optimal template bank is achieved by the A_n* lattice, which is the best lattice-covering in dimensions n <= 5, and is close to the bes... |
1708.00935 | Prieslei Goulart | Prieslei Goulart | Phantom wormholes in Einstein-Maxwell-dilaton theory | v3: Solution and deflection angle written in terms of asymptotic
charges. Matches the published version, Classical and Quantum Gravity (2017) | null | 10.1088/1361-6382/aa9dfc | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we give an electrically charged traversable wormhole solution
for the Einstein-Maxwell-dilaton theory when the dilaton is a phantom field,
i.e. it has flipped sign kinetic term appearing in the action. In the limit
when the charge is zero, we recover the anti-Fisher solution, which can be
reduced to the... | [
{
"created": "Wed, 2 Aug 2017 21:21:47 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Aug 2017 18:53:04 GMT",
"version": "v2"
},
{
"created": "Wed, 6 Dec 2017 13:34:56 GMT",
"version": "v3"
}
] | 2017-12-07 | [
[
"Goulart",
"Prieslei",
""
]
] | In this paper we give an electrically charged traversable wormhole solution for the Einstein-Maxwell-dilaton theory when the dilaton is a phantom field, i.e. it has flipped sign kinetic term appearing in the action. In the limit when the charge is zero, we recover the anti-Fisher solution, which can be reduced to the B... |
2102.00023 | Martin Pernot-Borr\`as | Martin Pernot-Borr\`as, Jo\"el Berg\'e, Philippe Brax, Jean-Philippe
Uzan, Gilles M\'etris, Manuel Rodrigues and Pierre Touboul | Constraints on chameleon gravity from the measurement of the
electrostatic stiffness of the MICROSCOPE mission accelerometers | Submitted to PRD | Phys. Rev. D 103, 064070 (2021) | 10.1103/PhysRevD.103.064070 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | This article is dedicated to the use the MICROSCOPE mission's data to test
chameleon theory of gravity. We take advantage of the technical sessions aimed
to characterize the electrostatic stiffness of MICROSCOPE's instrument
intrinsic to its capacitive measurement system. Any discrepancy between the
expected and meas... | [
{
"created": "Fri, 29 Jan 2021 19:02:01 GMT",
"version": "v1"
}
] | 2021-03-31 | [
[
"Pernot-Borràs",
"Martin",
""
],
[
"Bergé",
"Joël",
""
],
[
"Brax",
"Philippe",
""
],
[
"Uzan",
"Jean-Philippe",
""
],
[
"Métris",
"Gilles",
""
],
[
"Rodrigues",
"Manuel",
""
],
[
"Touboul",
"Pierre",
""
... | This article is dedicated to the use the MICROSCOPE mission's data to test chameleon theory of gravity. We take advantage of the technical sessions aimed to characterize the electrostatic stiffness of MICROSCOPE's instrument intrinsic to its capacitive measurement system. Any discrepancy between the expected and measur... |
gr-qc/0012066 | Gabor Kunstatter | Andrei Barvinsky (Lebedev Inst.), Saurya Das (U. of Winnipeg) and
Gabor Kunstatter (U. of Winnipeg) | Spectrum of Charged Black Holes - The Big Fix Mechanism Revisited | 21 pages, Latex. 1 Section, 1 Figure added. To appear in Class. and
Quant. Gravity | Class.Quant.Grav. 18 (2001) 4845-4862 | 10.1088/0264-9381/18/22/310 | null | gr-qc hep-th | null | Following an earlier suggestion of the authors(gr-qc/9607030), we use some
basic properties of Euclidean black hole thermodynamics and the quantum
mechanics of systems with periodic phase space coordinate to derive the
discrete two-parameter area spectrum of generic charged spherically symmetric
black holes in any di... | [
{
"created": "Tue, 19 Dec 2000 02:26:53 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Jan 2001 02:22:33 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Oct 2001 23:12:28 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Barvinsky",
"Andrei",
"",
"Lebedev Inst."
],
[
"Das",
"Saurya",
"",
"U. of Winnipeg"
],
[
"Kunstatter",
"Gabor",
"",
"U. of Winnipeg"
]
] | Following an earlier suggestion of the authors(gr-qc/9607030), we use some basic properties of Euclidean black hole thermodynamics and the quantum mechanics of systems with periodic phase space coordinate to derive the discrete two-parameter area spectrum of generic charged spherically symmetric black holes in any dime... |
2102.03591 | Cong Zhang | Cong Zhang, Shicong Song, Muxin Han | First-Order Quantum Correction in Coherent State Expectation Value of
Loop-Quantum-Gravity Hamiltonian | 29+25 pages, 2 figures, presenting the detailed derivations of our
previous work arXiv:2012.14242, adapted to the published version | Phys. Rev. D 105, 064008 (2022) | 10.1103/PhysRevD.105.064008 | null | gr-qc astro-ph.CO hep-lat hep-th | http://creativecommons.org/licenses/by/4.0/ | Given the non-graph-changing Hamiltonian $\widehat{H[N]}$ in Loop Quantum
Gravity (LQG), $\langle\widehat{H[N]}\rangle$, the coherent state expectation
value of $\widehat{H[N]}$, admits an semiclassical expansion in $\ell^2_{\rm
p}$. In this paper, as presenting the detailed derivations of our previous work
arXiv:201... | [
{
"created": "Sat, 6 Feb 2021 14:59:14 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Sep 2021 10:25:08 GMT",
"version": "v2"
},
{
"created": "Thu, 10 Mar 2022 23:00:26 GMT",
"version": "v3"
}
] | 2022-03-14 | [
[
"Zhang",
"Cong",
""
],
[
"Song",
"Shicong",
""
],
[
"Han",
"Muxin",
""
]
] | Given the non-graph-changing Hamiltonian $\widehat{H[N]}$ in Loop Quantum Gravity (LQG), $\langle\widehat{H[N]}\rangle$, the coherent state expectation value of $\widehat{H[N]}$, admits an semiclassical expansion in $\ell^2_{\rm p}$. In this paper, as presenting the detailed derivations of our previous work arXiv:2012.... |
1304.2305 | Frans Klinkhamer | F.R. Klinkhamer | Black-hole solution without curvature singularity | 6 pages; v10: published version | null | 10.1142/S0217732313501368 | KA-TP-08-2013 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An exact solution of the vacuum Einstein field equations over a
nonsimply-connected manifold is presented. This solution is spherically
symmetric and has no curvature singularity. It can be considered to be a
regularization of the Schwarzschild solution over a simply-connected manifold,
which has a curvature singular... | [
{
"created": "Mon, 8 Apr 2013 18:41:57 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Sep 2013 08:13:20 GMT",
"version": "v10"
},
{
"created": "Wed, 10 Apr 2013 18:43:21 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Apr 2013 18:56:48 GMT",
"version": "v3"
},
{
"cr... | 2013-09-06 | [
[
"Klinkhamer",
"F. R.",
""
]
] | An exact solution of the vacuum Einstein field equations over a nonsimply-connected manifold is presented. This solution is spherically symmetric and has no curvature singularity. It can be considered to be a regularization of the Schwarzschild solution over a simply-connected manifold, which has a curvature singularit... |
gr-qc/0204020 | T. Padmanabhan | T.Padmanabhan | Why do we observe a small but non zero cosmological constant ? | couple of references added; matches with published version | Class.Quant.Grav. 19 (2002) L167-L174 | 10.1088/0264-9381/19/17/102 | null | gr-qc astro-ph hep-th | null | The current observations seem to suggest that the universe has a positive
cosmological constant of the order of $H_0^2$ while the most natural value for
the cosmological constant will be $L_P^{-2}$ where $L_P = (G\hbar/c^3)^{1/2}$
is the Planck length. This reduction of the cosmological constant from
$L_P^{-2} $ to $... | [
{
"created": "Thu, 4 Apr 2002 14:47:46 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Aug 2002 09:12:09 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Padmanabhan",
"T.",
""
]
] | The current observations seem to suggest that the universe has a positive cosmological constant of the order of $H_0^2$ while the most natural value for the cosmological constant will be $L_P^{-2}$ where $L_P = (G\hbar/c^3)^{1/2}$ is the Planck length. This reduction of the cosmological constant from $L_P^{-2} $ to $L_... |
1404.0328 | Jansen Formiga | J. B. Formiga and T. S. Almeida | Wormholes in Wyman's solution | the content was improved and some new references were added | null | 10.1142/S0218271814500862 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The most general solution of the Einstein field equations coupled with a
massless scalar field is known as Wyman's solution. This solution is also
present in the Brans-Dicke theory and, due to its importance, it has been
studied in detail by many authors. However, this solutions has not been studied
from the perspect... | [
{
"created": "Tue, 1 Apr 2014 17:54:43 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Apr 2014 23:40:37 GMT",
"version": "v2"
},
{
"created": "Sat, 10 May 2014 14:11:29 GMT",
"version": "v3"
},
{
"created": "Wed, 10 Sep 2014 16:39:53 GMT",
"version": "v4"
}
] | 2014-09-29 | [
[
"Formiga",
"J. B.",
""
],
[
"Almeida",
"T. S.",
""
]
] | The most general solution of the Einstein field equations coupled with a massless scalar field is known as Wyman's solution. This solution is also present in the Brans-Dicke theory and, due to its importance, it has been studied in detail by many authors. However, this solutions has not been studied from the perspectiv... |
gr-qc/0703075 | Wolfgang Tichy | Wolfgang Tichy, Pedro Marronetti | Binary black hole mergers: large kicks for generic spin orientations | 5 pages, 3 figures, to be submitted to PRD | Phys.Rev.D76:061502,2007 | 10.1103/PhysRevD.76.061502 | null | gr-qc astro-ph | null | We present results from several simulations of equal mass black holes with
spin. The spin magnitudes are $S/m^2=0.8$ in all cases, but we vary the spin
orientations arbitrarily, in and outside the orbital plane. We find that in all
but one case the final merged black hole acquires a kick of more than 1000
km/s, indic... | [
{
"created": "Tue, 13 Mar 2007 16:05:37 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Tichy",
"Wolfgang",
""
],
[
"Marronetti",
"Pedro",
""
]
] | We present results from several simulations of equal mass black holes with spin. The spin magnitudes are $S/m^2=0.8$ in all cases, but we vary the spin orientations arbitrarily, in and outside the orbital plane. We find that in all but one case the final merged black hole acquires a kick of more than 1000 km/s, indicat... |
1208.3828 | Artyom Astashenok V | Artyom V. Yurov, Artyom V. Astashenok, Valerian A. Yurov | The Big Trip and Wheeler-DeWitt equation | accepted in Astrophysics and Space Science | Astrophysics and Space Science 342, 1 (2012) | 10.1007/s10509-012-1211-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Of all the possible ways to describe the behavior of the universe that has
undergone a big trip the Wheeler-DeWitt equation should be the most accurate --
provided, of course, that we employ the correct formulation. In this article we
start by discussing the standard formulation introduced by Gonz\'alez-D\'iaz
and Ji... | [
{
"created": "Sun, 19 Aug 2012 12:40:10 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Yurov",
"Artyom V.",
""
],
[
"Astashenok",
"Artyom V.",
""
],
[
"Yurov",
"Valerian A.",
""
]
] | Of all the possible ways to describe the behavior of the universe that has undergone a big trip the Wheeler-DeWitt equation should be the most accurate -- provided, of course, that we employ the correct formulation. In this article we start by discussing the standard formulation introduced by Gonz\'alez-D\'iaz and Jime... |
1503.06311 | Dionisios Krongos | D. S. Krongos and C. G. Torre | Geometrization Conditions for Perfect Fluids, Scalar Fields, and
Electromagnetic Fields | 28 pages, no figures | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Rainich-type conditions giving a spacetime "geometrization" of matter fields
in general relativity are reviewed and extended. Three types of matter are
considered: perfect fluids, scalar fields, and electromagnetic fields.
Necessary and sufficient conditions on a spacetime metric for it to be part of
a perfect fluid ... | [
{
"created": "Sat, 21 Mar 2015 15:30:27 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Mar 2015 14:40:12 GMT",
"version": "v2"
},
{
"created": "Tue, 21 Jul 2015 03:15:37 GMT",
"version": "v3"
}
] | 2015-07-22 | [
[
"Krongos",
"D. S.",
""
],
[
"Torre",
"C. G.",
""
]
] | Rainich-type conditions giving a spacetime "geometrization" of matter fields in general relativity are reviewed and extended. Three types of matter are considered: perfect fluids, scalar fields, and electromagnetic fields. Necessary and sufficient conditions on a spacetime metric for it to be part of a perfect fluid so... |
2012.06665 | Carlos A. Mar\'in V. | Carlos Mar\'in and Jorge poveda | Spin contribution to the perihelion precession in binary systems like
OJ287: higher order corrections | 20 pages, 1 figure. arXiv admin note: text overlap with
arXiv:1802.03333 | null | 10.1007/s10509-021-04011-8 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Higher order corrections are obtained for the perihelion precession in binary
systems like OJ287, Sagittarius A*-S2 and H1821+643 using both the
Schwarzschild metric and the Kerr metric to take into account the spin effect.
The corrections are performed considering the third root of the motion equation
and developing... | [
{
"created": "Fri, 11 Dec 2020 22:34:33 GMT",
"version": "v1"
}
] | 2021-11-24 | [
[
"Marín",
"Carlos",
""
],
[
"poveda",
"Jorge",
""
]
] | Higher order corrections are obtained for the perihelion precession in binary systems like OJ287, Sagittarius A*-S2 and H1821+643 using both the Schwarzschild metric and the Kerr metric to take into account the spin effect. The corrections are performed considering the third root of the motion equation and developing t... |
1811.11364 | Sumanta Chakraborty | Kabir Chakravarti, Sumanta Chakraborty, Sukanta Bose and Soumitra
SenGupta | Tidal Love Numbers of Black Holes and Neutron Stars in the Presence of
Higher Dimensions: Implications of GW170817 | Published Version, Minor revision, 28 pages, 5 figures | Phys. Rev. D 99, 024036 (2019) | 10.1103/PhysRevD.99.024036 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the tidal Love numbers of black holes and neutron stars in the
presence of higher dimensions. The perturbation equations around an arbitrary
static and spherically symmetric metric for the even parity modes are presented
in the context of an effective four-dimensional theory on the brane. This
subsequent... | [
{
"created": "Wed, 28 Nov 2018 02:45:33 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Jan 2019 02:02:56 GMT",
"version": "v2"
}
] | 2019-01-30 | [
[
"Chakravarti",
"Kabir",
""
],
[
"Chakraborty",
"Sumanta",
""
],
[
"Bose",
"Sukanta",
""
],
[
"SenGupta",
"Soumitra",
""
]
] | We calculate the tidal Love numbers of black holes and neutron stars in the presence of higher dimensions. The perturbation equations around an arbitrary static and spherically symmetric metric for the even parity modes are presented in the context of an effective four-dimensional theory on the brane. This subsequently... |
0801.4553 | Claus Lammerzahl | Ertan G\"okl\"u and Claus L\"ammerzahl | Metric fluctuations and the Weak Equivalence Principle | 10 pages, to appear in Class. Quantum Grav. (2008) | Class.Quant.Grav.25:105012,2008 | 10.1088/0264-9381/25/10/105012 | null | gr-qc quant-ph | null | We describe space--time fluctuations by means of small fluctuations of the
metric on a given background metric. From a minimally coupled Klein--Gordon
equation we obtain within a weak-field approximation up to second order and an
averaging procedure over a finite space--time scale given by the quantum
particle in the... | [
{
"created": "Tue, 29 Jan 2008 20:26:21 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Jan 2008 10:44:09 GMT",
"version": "v2"
},
{
"created": "Wed, 9 Apr 2008 07:52:03 GMT",
"version": "v3"
},
{
"created": "Thu, 24 Apr 2008 12:27:42 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Göklü",
"Ertan",
""
],
[
"Lämmerzahl",
"Claus",
""
]
] | We describe space--time fluctuations by means of small fluctuations of the metric on a given background metric. From a minimally coupled Klein--Gordon equation we obtain within a weak-field approximation up to second order and an averaging procedure over a finite space--time scale given by the quantum particle in the n... |
gr-qc/9804058 | Patrick R. Brady | Patrick R Brady and Adrian C Ottewill | Quantum corrections to critical phenomena in gravitational collapse | RevTeX, 6 pages, 3 figures included using psfig | Phys.Rev.D58:024006,1998 | 10.1103/PhysRevD.58.024006 | GRP-492 | gr-qc | null | We investigate conformally coupled quantum matter fields on spherically
symmetric, continuously self-similar backgrounds. By exploiting the symmetry
associated with the self-similarity the general structure of the renormalized
quantum stress-energy tensor can be derived. As an immediate application we
consider a comb... | [
{
"created": "Thu, 23 Apr 1998 00:18:57 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Brady",
"Patrick R",
""
],
[
"Ottewill",
"Adrian C",
""
]
] | We investigate conformally coupled quantum matter fields on spherically symmetric, continuously self-similar backgrounds. By exploiting the symmetry associated with the self-similarity the general structure of the renormalized quantum stress-energy tensor can be derived. As an immediate application we consider a combin... |
gr-qc/9909051 | Janna Levin | Janna Levin, Rachel O'Reilly and E.J. Copeland | Gravity waves from relativistic binaries | LaTeX file | Phys.Rev. D62 (2000) 024023 | 10.1103/PhysRevD.62.024023 | null | gr-qc astro-ph | null | The stability of binary orbits can significantly shape the gravity wave
signal which future Earth-based interferometers hope to detect. The inner most
stable circular orbit has been of interest as it marks the transition from the
late inspiral to final plunge. We consider purely relativistic orbits beyond
the circula... | [
{
"created": "Thu, 16 Sep 1999 10:53:13 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Levin",
"Janna",
""
],
[
"O'Reilly",
"Rachel",
""
],
[
"Copeland",
"E. J.",
""
]
] | The stability of binary orbits can significantly shape the gravity wave signal which future Earth-based interferometers hope to detect. The inner most stable circular orbit has been of interest as it marks the transition from the late inspiral to final plunge. We consider purely relativistic orbits beyond the circular ... |
0811.0932 | Lars Andersson | Lars Andersson (UM and AEI), Robert Beig (Vienna), Bernd Schmidt (AEI) | Rotating elastic bodies in Einstein gravity | 27 pages | Commun.Pure Appl.Math.63:559-589,2009 | 10.1002/cpa.20302 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove that, given a stress-free, axially symmetric elastic body, there
exists, for sufficiently small values of the gravitational constant and of the
angular frequency, a unique stationary axisymmetric solution to the Einstein
equations coupled to the equations of relativistic elasticity with the body
performing r... | [
{
"created": "Thu, 6 Nov 2008 12:58:05 GMT",
"version": "v1"
}
] | 2011-07-28 | [
[
"Andersson",
"Lars",
"",
"UM and AEI"
],
[
"Beig",
"Robert",
"",
"Vienna"
],
[
"Schmidt",
"Bernd",
"",
"AEI"
]
] | We prove that, given a stress-free, axially symmetric elastic body, there exists, for sufficiently small values of the gravitational constant and of the angular frequency, a unique stationary axisymmetric solution to the Einstein equations coupled to the equations of relativistic elasticity with the body performing rig... |
gr-qc/0507052 | Michael Martin Nieto | Michael Martin Nieto and John D. Anderson | Using Early Data to Illuminate the Pioneer Anomaly | 19 pages, 6 figures, 2 tables, additional material | Class.Quant.Grav. 22 (2005) 5343-5354 | 10.1088/0264-9381/22/24/008 | LA-UR-05-5110 | gr-qc | null | Analysis of the radio tracking data from the Pioneer 10/11 spacecraft at
distances between about 20 - 70 AU from the Sun has consistently indicated the
presence of an unmodeled, small, constant, Doppler blue shift drift of order 6
\times 10^{-9} Hz/s. After accounting for systematics, this drift can be
interpreted as... | [
{
"created": "Tue, 12 Jul 2005 19:23:20 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Oct 2005 21:33:53 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Nieto",
"Michael Martin",
""
],
[
"Anderson",
"John D.",
""
]
] | Analysis of the radio tracking data from the Pioneer 10/11 spacecraft at distances between about 20 - 70 AU from the Sun has consistently indicated the presence of an unmodeled, small, constant, Doppler blue shift drift of order 6 \times 10^{-9} Hz/s. After accounting for systematics, this drift can be interpreted as a... |
gr-qc/0007070 | Hideki Ishihara | Hideki Ishihara | Causality of the brane universe | LaTeX, 9 pages, 4 EPS figures to appear in Phys. Rev. Lett | Phys.Rev.Lett.86:381-384,2001 | 10.1103/PhysRevLett.86.381 | null | gr-qc hep-th | null | Causal structure of the brane universe with respect to null geodesics in the
bulk spacetime is studied. It is pointed out that apparent causality violation
is possible for the brane universe which contains matter energy. It is also
shown that there is no 'horizon problem' in the Friedmann-Robertson-Walker
brane unive... | [
{
"created": "Wed, 26 Jul 2000 18:18:00 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Dec 2000 15:31:26 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Ishihara",
"Hideki",
""
]
] | Causal structure of the brane universe with respect to null geodesics in the bulk spacetime is studied. It is pointed out that apparent causality violation is possible for the brane universe which contains matter energy. It is also shown that there is no 'horizon problem' in the Friedmann-Robertson-Walker brane univers... |
2101.02146 | Mar\'ia Benito | Mar\'ia Benito and Aneta Wojnar | Cooling process of brown dwarfs in Palatini f(R) gravity | 8 pages, 2 figure, 2 tables. Comments are welcome | Phys. Rev. D 103, 064032 (2021) | 10.1103/PhysRevD.103.064032 | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an analytical model for the evolution of brown dwarfs in quadratic
Palatini f(R) gravity. We improve previous studies by adopting a more realistic
description of the partially-degenerate state that characterizes brown dwarfs.
Furthermore, we take into account the hydrogen metallic-molecular phase
transitio... | [
{
"created": "Wed, 6 Jan 2021 17:25:45 GMT",
"version": "v1"
}
] | 2021-03-24 | [
[
"Benito",
"María",
""
],
[
"Wojnar",
"Aneta",
""
]
] | We present an analytical model for the evolution of brown dwarfs in quadratic Palatini f(R) gravity. We improve previous studies by adopting a more realistic description of the partially-degenerate state that characterizes brown dwarfs. Furthermore, we take into account the hydrogen metallic-molecular phase transition ... |
1507.00187 | Diego Pavon | Sergio del Campo, Ramon Herrera, and Diego Pavon | Interaction in the dark sector | 23 pages, 24 figures; Published the Phys. Rev | Physical Review D 91, 123539 (2015) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It may well happen that the two main components of the dark sector of the
Universe, dark matter and dark energy, do not evolve separately but interact
nongravitationally with one another. However, given our current lack of
knowledge on the microscopic nature of these two components there is no clear
theoretical path ... | [
{
"created": "Wed, 1 Jul 2015 11:09:59 GMT",
"version": "v1"
}
] | 2015-07-02 | [
[
"del Campo",
"Sergio",
""
],
[
"Herrera",
"Ramon",
""
],
[
"Pavon",
"Diego",
""
]
] | It may well happen that the two main components of the dark sector of the Universe, dark matter and dark energy, do not evolve separately but interact nongravitationally with one another. However, given our current lack of knowledge on the microscopic nature of these two components there is no clear theoretical path to... |
gr-qc/0406052 | Rituparno Goswami | Rituparno Goswami, Pankaj S Joshi | Gravitational collapse of an isentropic perfect fluid with a linear
equation of state | 7 Pages, Revtex4, To appear in Classical and Quantum Gravity | Class.Quant.Grav. 21 (2004) 3645-3654 | 10.1088/0264-9381/21/15/002 | null | gr-qc astro-ph hep-th | null | We investigate here the gravitational collapse end states for a spherically
symmetric perfect fluid with an equation of state $p=k\rho$. It is shown that
given a regular initial data in terms of the density and pressure profiles at
the initial epoch from which the collapse develops, the black hole or naked
singularit... | [
{
"created": "Sat, 12 Jun 2004 09:52:32 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Goswami",
"Rituparno",
""
],
[
"Joshi",
"Pankaj S",
""
]
] | We investigate here the gravitational collapse end states for a spherically symmetric perfect fluid with an equation of state $p=k\rho$. It is shown that given a regular initial data in terms of the density and pressure profiles at the initial epoch from which the collapse develops, the black hole or naked singularity ... |
1406.7352 | Henry Stoltenberg | Henry Stoltenberg, Andreas Albrecht | Eternal Inflation with Arrival Terminals | 6 pages, 4 figures. V2: Final version accepted for publication in
PRD. Presentation has been clarified in sections I and IV. No changes to our
technical points and conclusions | null | 10.1103/PhysRevD.91.023503 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the cosmological role of terminal vacua in the string theory
landscape, and point out that existing work on this topic makes very strong
assumptions about the properties of the terminal vacua. We explore the
implications of relaxing these assumptions (by including "arrival" as well as
"departure" terminals... | [
{
"created": "Sat, 28 Jun 2014 04:08:04 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Jan 2015 03:45:28 GMT",
"version": "v2"
}
] | 2015-06-22 | [
[
"Stoltenberg",
"Henry",
""
],
[
"Albrecht",
"Andreas",
""
]
] | We analyze the cosmological role of terminal vacua in the string theory landscape, and point out that existing work on this topic makes very strong assumptions about the properties of the terminal vacua. We explore the implications of relaxing these assumptions (by including "arrival" as well as "departure" terminals) ... |
1604.08930 | Ambrish Raghoonundun | Ambrish M. Raghoonundun | Exact Solutions for Compact Objects in General Relativity | 314 pages, PhD Thesis, defended on 12 April 2016. Separate chapters
will be published subsequently as journal articles | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Seven new solutions to the interior static and spherically symmetric
Einstein's field equations (EFE) are found and investigated. These new
solutions are a generalisation of the quadratic density fall-off profile of the
Tolman VII solution. The generalisation involves the addition of anisotropic
pressures and electri... | [
{
"created": "Fri, 29 Apr 2016 18:34:48 GMT",
"version": "v1"
}
] | 2016-05-02 | [
[
"Raghoonundun",
"Ambrish M.",
""
]
] | Seven new solutions to the interior static and spherically symmetric Einstein's field equations (EFE) are found and investigated. These new solutions are a generalisation of the quadratic density fall-off profile of the Tolman VII solution. The generalisation involves the addition of anisotropic pressures and electric ... |
1606.01911 | Ali Teimouri | Ali Teimouri, Spyridon Talaganis, James Edholm, Anupam Mazumdar | Generalised Boundary Terms for Higher Derivative Theories of Gravity | 37 pages | null | 10.1007/JHEP08(2016)144 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we wish to find the corresponding Gibbons-Hawking-York term for
the most general quadratic in curvature gravity by using Coframe slicing within
the Arnowitt-Deser-Misner (ADM) decomposition of spacetime in four dimensions.
In order to make sure that the higher derivative gravity is ghost and tachyon
fre... | [
{
"created": "Mon, 6 Jun 2016 20:01:02 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Aug 2016 01:01:07 GMT",
"version": "v2"
}
] | 2016-09-21 | [
[
"Teimouri",
"Ali",
""
],
[
"Talaganis",
"Spyridon",
""
],
[
"Edholm",
"James",
""
],
[
"Mazumdar",
"Anupam",
""
]
] | In this paper we wish to find the corresponding Gibbons-Hawking-York term for the most general quadratic in curvature gravity by using Coframe slicing within the Arnowitt-Deser-Misner (ADM) decomposition of spacetime in four dimensions. In order to make sure that the higher derivative gravity is ghost and tachyon free ... |
1904.10310 | Ayan Banerjee | Ayan Banerjee, P. H. R. S. Moraes, R. A. C. Correa and G. Ribeiro | Wormholes in Randall-Sundrum braneworld | 10 Pages and 4 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Braneworld models were firstly proposed as a great alternative for the
hierarcy problem of particle physics, by allowing gravitons, differently from
the other interacting bosons, to propagate through an extradimensional space
named bulk. As time passed by the braneworld setup has also shown to be able to
provide inte... | [
{
"created": "Sun, 21 Apr 2019 18:44:30 GMT",
"version": "v1"
}
] | 2019-04-24 | [
[
"Banerjee",
"Ayan",
""
],
[
"Moraes",
"P. H. R. S.",
""
],
[
"Correa",
"R. A. C.",
""
],
[
"Ribeiro",
"G.",
""
]
] | Braneworld models were firstly proposed as a great alternative for the hierarcy problem of particle physics, by allowing gravitons, differently from the other interacting bosons, to propagate through an extradimensional space named bulk. As time passed by the braneworld setup has also shown to be able to provide intere... |
2304.07098 | Amir Shakirzyanov | Amir F. Shakirzyanov and Alexander B. Balakin | Axion electrodynamics on the Bianchi spacetime platform: Fingerprints of
shear of the aether velocity | 3 pages, 0 Figures, Short communication based on the talk presented
on the Fifth International Winter School-Seminar on Gravitation, Astrophysics
and Cosmology Petrov Readings -2022, Kazan, Russia | Space, Time and Fundamental Interactions, 2023, N1 (42), pp.
121-124 | 10.17238/issn2226-8812.2023.1.121--124 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of axionically extended Einstein-Maxwell-aether theory we
study the structure of the electromagnetic field allowed by the anisotropic
cosmological spacetime platforms associated with the Bianchi models. These
models guarantee that the aether velocity possesses the shear, and we focus on
its role in t... | [
{
"created": "Fri, 14 Apr 2023 12:38:38 GMT",
"version": "v1"
}
] | 2023-04-17 | [
[
"Shakirzyanov",
"Amir F.",
""
],
[
"Balakin",
"Alexander B.",
""
]
] | In the framework of axionically extended Einstein-Maxwell-aether theory we study the structure of the electromagnetic field allowed by the anisotropic cosmological spacetime platforms associated with the Bianchi models. These models guarantee that the aether velocity possesses the shear, and we focus on its role in the... |
2104.02255 | Philip Beltracchi | Philip Beltracchi and Paolo Gondolo | Physical interpretation of Newman-Janis rotating systems. I. A unique
family of Kerr-Schild systems | Replaced with updated version, published at Phys. Rev. D 104, 124066
(2021) | null | 10.1103/PhysRevD.104.124066 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The Newman-Janis algorithm and its generalizations can be used mathematically
to generate rotating solutions from nonrotating spherically-symmetric solutions
within general relativity. The energy-momentum tensors of these solutions may
or may not represent the same physical system, in the sense of both being a
perfec... | [
{
"created": "Tue, 6 Apr 2021 02:52:43 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Dec 2021 20:26:06 GMT",
"version": "v2"
}
] | 2022-01-05 | [
[
"Beltracchi",
"Philip",
""
],
[
"Gondolo",
"Paolo",
""
]
] | The Newman-Janis algorithm and its generalizations can be used mathematically to generate rotating solutions from nonrotating spherically-symmetric solutions within general relativity. The energy-momentum tensors of these solutions may or may not represent the same physical system, in the sense of both being a perfect ... |
1408.5058 | Ermis Mitsou | Yves Dirian and Ermis Mitsou | Stability analysis and future singularity of the $m^2 R \Box^{-2} R$
model of non-local gravity | 19 pages, 4 figures, technical details/references added, version
accepted for publication in JCAP | JCAP 10 (2014) 065 | 10.1088/1475-7516/2014/10/065 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse the classical stability of the model proposed by Maggiore and
Mancarella, where gravity is modified by a term $\sim m^2 R \Box^{-2} R$ to
produce the late-time acceleration of the expansion of the universe. Our study
takes into account all excitations of the metric that can potentially drive an
instability... | [
{
"created": "Thu, 21 Aug 2014 16:37:13 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Aug 2014 20:58:18 GMT",
"version": "v2"
},
{
"created": "Tue, 2 Dec 2014 10:38:16 GMT",
"version": "v3"
}
] | 2015-01-19 | [
[
"Dirian",
"Yves",
""
],
[
"Mitsou",
"Ermis",
""
]
] | We analyse the classical stability of the model proposed by Maggiore and Mancarella, where gravity is modified by a term $\sim m^2 R \Box^{-2} R$ to produce the late-time acceleration of the expansion of the universe. Our study takes into account all excitations of the metric that can potentially drive an instability. ... |
gr-qc/0603134 | Prasanta Mahato | Prasanta Mahato | Torsion, Dirac Field, Dark Matter and Dark Radiation | null | Int.J.Mod.Phys. A22 (2007) 835-850 | 10.1142/S0217751X07034076 | null | gr-qc | null | The role of torsion and a scalar field $\phi$ in gravitation, especially, in
the presence of a Dirac field in the background of a particular class of the
Riemann-Cartan geometry is considered here. Recently, a Lagrangian density with
Lagrange multipliers has been proposed by the author which has been obtained by
pick... | [
{
"created": "Fri, 31 Mar 2006 17:18:33 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Apr 2006 16:40:16 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Mahato",
"Prasanta",
""
]
] | The role of torsion and a scalar field $\phi$ in gravitation, especially, in the presence of a Dirac field in the background of a particular class of the Riemann-Cartan geometry is considered here. Recently, a Lagrangian density with Lagrange multipliers has been proposed by the author which has been obtained by pickin... |
1410.1714 | Julien Grain | A. Barrau, J. Grain | Loop quantum gravity and observations | draft chapter for a volume edited by A. Ashtekar and J. Pullin, to be
published in the World Scientific series "100 Years of General Relativity"
Minor corrections and new references added | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum gravity has long been thought to be completely decoupled from
experiments or observations. Although it is true that smoking guns are still
missing, there are now serious hopes that quantum gravity phenomena might be
tested. We review here some possible ways to observe loop quantum gravity
effects either in th... | [
{
"created": "Tue, 7 Oct 2014 13:07:16 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Oct 2015 09:12:14 GMT",
"version": "v2"
}
] | 2015-10-29 | [
[
"Barrau",
"A.",
""
],
[
"Grain",
"J.",
""
]
] | Quantum gravity has long been thought to be completely decoupled from experiments or observations. Although it is true that smoking guns are still missing, there are now serious hopes that quantum gravity phenomena might be tested. We review here some possible ways to observe loop quantum gravity effects either in the ... |
0907.2787 | Gonzalo Olmo | Gonzalo J. Olmo, Helios Sanchis-Alepuz, Swapnil Tripathi | Dynamical Aspects of Generalized Palatini Theories of Gravity | 8 pages, no figures | Phys.Rev.D80:024013,2009 | 10.1103/PhysRevD.80.024013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the field equations of modified theories of gravity in which the
lagrangian is a general function of the Ricci scalar and Ricci-squared terms in
Palatini formalism. We show that the independent connection can be expressed as
the Levi-Civita connection of an auxiliary metric which, in particular cases of
inte... | [
{
"created": "Thu, 16 Jul 2009 09:09:19 GMT",
"version": "v1"
}
] | 2009-09-01 | [
[
"Olmo",
"Gonzalo J.",
""
],
[
"Sanchis-Alepuz",
"Helios",
""
],
[
"Tripathi",
"Swapnil",
""
]
] | We study the field equations of modified theories of gravity in which the lagrangian is a general function of the Ricci scalar and Ricci-squared terms in Palatini formalism. We show that the independent connection can be expressed as the Levi-Civita connection of an auxiliary metric which, in particular cases of intere... |
1705.09030 | Muxin Han | Muxin Han | Einstein Equation from Covariant Loop Quantum Gravity in Semiclassical
Continuum Limit | 12+3 pages, no figure, presentation improved | Phys. Rev. D 96, 024047 (2017) | 10.1103/PhysRevD.96.024047 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we explain how 4-dimensional general relativity and in
particular, the Einstein equation, emerge from the spinfoam amplitude in loop
quantum gravity. We propose a new limit which couples both the semiclassical
limit and continuum limit of spinfoam amplitudes. The continuum Einstein
equation emerges in t... | [
{
"created": "Thu, 25 May 2017 02:45:54 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Jul 2017 14:19:51 GMT",
"version": "v2"
}
] | 2017-07-28 | [
[
"Han",
"Muxin",
""
]
] | In this paper we explain how 4-dimensional general relativity and in particular, the Einstein equation, emerge from the spinfoam amplitude in loop quantum gravity. We propose a new limit which couples both the semiclassical limit and continuum limit of spinfoam amplitudes. The continuum Einstein equation emerges in thi... |
1907.04976 | Ashish Shukla | Pavel Kovtun and Ashish Shukla | Einstein's Equations in Matter | v2: Added section on matter in thermal equilibrium in anti-de Sitter
spacetime | Phys. Rev. D 101 (2020) 10, 104051 | 10.1103/PhysRevD.101.104051 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Einstein's equations in matter are gravitational analogues of Maxwell's
equations in matter, providing an effective classical description of
gravitational fields. We derive Einstein's equations in matter for relativistic
fluids, and use them to illustrate how the Tolman-Oppenheimer-Volkoff equations
are modified by t... | [
{
"created": "Thu, 11 Jul 2019 02:18:19 GMT",
"version": "v1"
},
{
"created": "Mon, 11 May 2020 08:41:40 GMT",
"version": "v2"
}
] | 2020-05-29 | [
[
"Kovtun",
"Pavel",
""
],
[
"Shukla",
"Ashish",
""
]
] | Einstein's equations in matter are gravitational analogues of Maxwell's equations in matter, providing an effective classical description of gravitational fields. We derive Einstein's equations in matter for relativistic fluids, and use them to illustrate how the Tolman-Oppenheimer-Volkoff equations are modified by the... |
2301.08748 | V. A. Golovko | V.A. Golovko | Rotation of galaxies and dark matter | A paragraph added at the end of Sec. 3 explaining why dark matter
cannot form the central bulge of rotating galaxies | Results in Phys. 44(2023) 106164 | 10.1016/j.rinp.2022.106164 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In a previous paper by the author was proposed a new metric for the
gravitational field of a thin rotating disk physically different from the Kerr
metric. The metric is admissible for any angular momentum of the disk. As
demonstrated in the present paper the parameter determining the angular
momentum of the Milky Way... | [
{
"created": "Fri, 20 Jan 2023 12:40:19 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Jul 2024 10:46:57 GMT",
"version": "v2"
}
] | 2024-07-26 | [
[
"Golovko",
"V. A.",
""
]
] | In a previous paper by the author was proposed a new metric for the gravitational field of a thin rotating disk physically different from the Kerr metric. The metric is admissible for any angular momentum of the disk. As demonstrated in the present paper the parameter determining the angular momentum of the Milky Way g... |
1812.10228 | Nomaan X | Sumati Surya, Nomaan X and Yasaman K. Yazdi | Studies on the SJ Vacuum in de Sitter Spacetime | 43 pages, 25 figures | JHEP 1907 (2019) 009 | 10.1007/JHEP07(2019)009 | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | In this work we study the Sorkin-Johnston (SJ) vacuum in de Sitter spacetime
for free scalar field theory. For the massless theory we find that the SJ
vacuum can neither be obtained from the $O(4)$ Fock vacuum of Allen and Folacci
nor from the non-Fock de Sitter invariant vacuum of Kirsten and Garriga. Using
a causal... | [
{
"created": "Wed, 26 Dec 2018 05:06:55 GMT",
"version": "v1"
},
{
"created": "Sun, 28 Jul 2019 08:13:30 GMT",
"version": "v2"
}
] | 2019-07-30 | [
[
"Surya",
"Sumati",
""
],
[
"X",
"Nomaan",
""
],
[
"Yazdi",
"Yasaman K.",
""
]
] | In this work we study the Sorkin-Johnston (SJ) vacuum in de Sitter spacetime for free scalar field theory. For the massless theory we find that the SJ vacuum can neither be obtained from the $O(4)$ Fock vacuum of Allen and Folacci nor from the non-Fock de Sitter invariant vacuum of Kirsten and Garriga. Using a causal s... |
2302.07835 | Ruben Campos Delgado | Ruben Campos Delgado | Quantum gravitational corrected evolution equations of charged black
holes | 12 pages; accepted for publication in JHAP | JHAP 3 (2023) 39-48 | 10.22128/JHAP.2023.643.1037 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We explain how quantum gravity, treated as an effective field theory, might
modify the evaporative evolution of a four-dimensional, non-extremal,
non-rotating, charged black hole. With some approximations, we derive a set of
coupled differential equations describing the charge and mass of the black hole
as a function... | [
{
"created": "Sun, 12 Feb 2023 15:47:41 GMT",
"version": "v1"
}
] | 2023-04-04 | [
[
"Delgado",
"Ruben Campos",
""
]
] | We explain how quantum gravity, treated as an effective field theory, might modify the evaporative evolution of a four-dimensional, non-extremal, non-rotating, charged black hole. With some approximations, we derive a set of coupled differential equations describing the charge and mass of the black hole as a function o... |
1011.2149 | You Ding | You Ding, Muxin Han, Carlo Rovelli | Generalized Spinfoams | 16 pages, 3 figures | Phys.Rev.D83:124020,2011 | 10.1103/PhysRevD.83.124020 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reconsider the spinfoam dynamics that has been recently introduced, in the
generalized Kaminski-Kisielowski-Lewandowski (KKL) version where the foam is
not dual to a triangulation. We study the Euclidean as well as the Lorentzian
case. We show that this theory can still be obtained as a constrained BF theory
satis... | [
{
"created": "Tue, 9 Nov 2010 16:53:28 GMT",
"version": "v1"
},
{
"created": "Sun, 14 Nov 2010 12:53:37 GMT",
"version": "v2"
}
] | 2011-06-27 | [
[
"Ding",
"You",
""
],
[
"Han",
"Muxin",
""
],
[
"Rovelli",
"Carlo",
""
]
] | We reconsider the spinfoam dynamics that has been recently introduced, in the generalized Kaminski-Kisielowski-Lewandowski (KKL) version where the foam is not dual to a triangulation. We study the Euclidean as well as the Lorentzian case. We show that this theory can still be obtained as a constrained BF theory satisfy... |
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