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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1602.02561 | Rainer Collier | Rainer Collier | Dirac Equation and Planck-Scale Quantities | 19 pages | null | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work investigates in which form quantities with Planck dimensions occur
already in the common quantum theory with local Lorentz symmetry. Since such
Planck quantities as Planck length or Planck mass involve the Planck constant
h, the velocity of light c and the Newton gravitational constant G, the
relativistic D... | [
{
"created": "Mon, 8 Feb 2016 13:31:43 GMT",
"version": "v1"
}
] | 2016-02-09 | [
[
"Collier",
"Rainer",
""
]
] | This work investigates in which form quantities with Planck dimensions occur already in the common quantum theory with local Lorentz symmetry. Since such Planck quantities as Planck length or Planck mass involve the Planck constant h, the velocity of light c and the Newton gravitational constant G, the relativistic Dir... |
1811.05979 | Davide Gerosa | Davide Gerosa, Alicia Lima, Emanuele Berti, Ulrich Sperhake, Michael
Kesden, Richard O'Shaughnessy | Wide nutation: binary black-hole spins repeatedly oscillating from full
alignment to full anti-alignment | Animated version of Fig. 3 available at
https://davidegerosa.com/spinprecession - Published in CQG | Class. Quantum Grav. 36, 10, 105003 (2019) | 10.1088/1361-6382/ab14ae | null | gr-qc astro-ph.GA astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the framework of 2PN black-hole binary spin precession, we explore
configurations where one of the two spins oscillates from being completely
aligned with the orbital angular momentum to being completely anti-aligned with
it during a single precession cycle. This "wide nutation" is the extreme limit
of the gen... | [
{
"created": "Wed, 14 Nov 2018 19:00:02 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Apr 2019 15:16:28 GMT",
"version": "v2"
}
] | 2019-04-16 | [
[
"Gerosa",
"Davide",
""
],
[
"Lima",
"Alicia",
""
],
[
"Berti",
"Emanuele",
""
],
[
"Sperhake",
"Ulrich",
""
],
[
"Kesden",
"Michael",
""
],
[
"O'Shaughnessy",
"Richard",
""
]
] | Within the framework of 2PN black-hole binary spin precession, we explore configurations where one of the two spins oscillates from being completely aligned with the orbital angular momentum to being completely anti-aligned with it during a single precession cycle. This "wide nutation" is the extreme limit of the gener... |
2302.05861 | Qiyuan Pan | Chengjia Chen, Qiyuan Pan, Jiliang Jing | Quasinormal modes of a scalar perturbation around a rotating BTZ-like
black hole in Einstein-bumblebee gravity | 15 pages, 1 figure | Phys. Lett. B 846, 138186 (2023) | 10.1016/j.physletb.2023.138186 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We analytically study the quasinormal modes of a scalar perturbation around a
rotating BTZ-like black hole in the Einstein-bumblebee gravity. We observe that
the Lorentz symmetry breaking parameter imprints only in the imaginary parts of
the quasinormal frequencies for the right-moving and left-moving modes. The
pert... | [
{
"created": "Sun, 12 Feb 2023 06:31:42 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Sep 2023 08:53:27 GMT",
"version": "v2"
}
] | 2023-09-26 | [
[
"Chen",
"Chengjia",
""
],
[
"Pan",
"Qiyuan",
""
],
[
"Jing",
"Jiliang",
""
]
] | We analytically study the quasinormal modes of a scalar perturbation around a rotating BTZ-like black hole in the Einstein-bumblebee gravity. We observe that the Lorentz symmetry breaking parameter imprints only in the imaginary parts of the quasinormal frequencies for the right-moving and left-moving modes. The pertur... |
gr-qc/9705008 | Melnikov-Guest | Vladimir D. Ivashchuk | Wick Rotation, Regularization of Propagators by a Complex Metric and
Multidimensional Cosmology | 9 pages, Latex. To appear in Grav. and Cosmol. v.3, No.1 (1997) | Grav.Cosmol. 3 (1997) 8-16 | null | RGS-VNIIMS-97/04 | gr-qc hep-ph hep-th | null | The Wick rotation in quantum field theory is considered in terms of
analytical continuation in the signature matrix parameter w = eta_00.
Regularization of propagators by a complex metric parameter in most cases
preserves (i) the convergence of Feynmann integrals (understood as Lebesgue
integrals) if the correspondin... | [
{
"created": "Tue, 6 May 1997 17:57:40 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Ivashchuk",
"Vladimir D.",
""
]
] | The Wick rotation in quantum field theory is considered in terms of analytical continuation in the signature matrix parameter w = eta_00. Regularization of propagators by a complex metric parameter in most cases preserves (i) the convergence of Feynmann integrals (understood as Lebesgue integrals) if the corresponding ... |
gr-qc/9612016 | Herbert Liebl | W. Kummer (Vienna, Tech. U.) | General Treatment of All 2d Covariant Models | 17 pages (latex file) | null | null | TUW-96-13 | gr-qc | null | General matterless models of gravity include dilaton gravity, arbitrary
powers in curvature, but also dynamical torsion. They are a special class of
"Poisson-sigma-models" whose solutions are known completely, together with
their general global structure. Beside the ordinary black hole, arbitrary
singularity structur... | [
{
"created": "Fri, 6 Dec 1996 12:51:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kummer",
"W.",
"",
"Vienna, Tech. U."
]
] | General matterless models of gravity include dilaton gravity, arbitrary powers in curvature, but also dynamical torsion. They are a special class of "Poisson-sigma-models" whose solutions are known completely, together with their general global structure. Beside the ordinary black hole, arbitrary singularity structures... |
1501.00571 | Thomas Adams Dr | T. Adams, J. R. Leong, J. Slutsky, M. Was, C. Affeldt, J. Degallaix,
K. L. Dooley, H. Grote, S. Hild, H. Lueck, D. M. Macleod, L. K. Nuttall, M.
Prijatelj, E. Schreiber, B. Sorazu, K. A. Strain, P. J. Sutton, H. Vahlbruch,
H. Witte, K. Danzmann | Cost-benefit analysis for commissioning decisions in GEO600 | 17 pages, 17 figures, 2 tables | null | 10.1088/0264-9381/32/13/135014 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational wave interferometers are complex instruments, requiring years
of commissioning to achieve the required sensitivities for the detection of
gravitational waves, of order 10^-21 in dimensionless detector strain, in the
tens of Hz to several kHz frequency band. Investigations carried out by the
GEO600 detec... | [
{
"created": "Sat, 3 Jan 2015 15:33:06 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Jul 2015 11:57:13 GMT",
"version": "v2"
}
] | 2015-07-13 | [
[
"Adams",
"T.",
""
],
[
"Leong",
"J. R.",
""
],
[
"Slutsky",
"J.",
""
],
[
"Was",
"M.",
""
],
[
"Affeldt",
"C.",
""
],
[
"Degallaix",
"J.",
""
],
[
"Dooley",
"K. L.",
""
],
[
"Grote",
"H.",
"... | Gravitational wave interferometers are complex instruments, requiring years of commissioning to achieve the required sensitivities for the detection of gravitational waves, of order 10^-21 in dimensionless detector strain, in the tens of Hz to several kHz frequency band. Investigations carried out by the GEO600 detecto... |
gr-qc/0008048 | Pablo Rafael Mora | Pablo Mora (Universidad de la Republica, Uruguay) | A Note in Cosmology and Loop Quantum Gravity | 9 pages, Latex | null | null | null | gr-qc | null | One possible description of the very early stages of the evolution of the
universe is provided by Chaotic Inflationary Cosmology. For that model the role
of the inflaton field is played by quantum gravitational effects. We study if
such a picture may arise within the framework of Loop Quantum gravity by
studying a si... | [
{
"created": "Mon, 21 Aug 2000 01:09:01 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mora",
"Pablo",
"",
"Universidad de la Republica, Uruguay"
]
] | One possible description of the very early stages of the evolution of the universe is provided by Chaotic Inflationary Cosmology. For that model the role of the inflaton field is played by quantum gravitational effects. We study if such a picture may arise within the framework of Loop Quantum gravity by studying a simp... |
2305.10933 | Mian Zhu | Yong Cai, Mian Zhu and Yun-Song Piao | Primordial black holes from null energy condition violation during
inflation | 9 pages, 5 figures + supplemental material, published in PRL | Physical Review Letters 133, 021001 (2024) | 10.1103/PhysRevLett.133.021001 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | Primordial black holes (PBHs) and the violation of the null energy condition
(NEC) have significant implications for our understanding of the very early
universe. We present a novel approach to generate PBHs via the NEC violation in
a single-field inflationary scenario. In our scenario, the universe transitions
from ... | [
{
"created": "Thu, 18 May 2023 12:49:32 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jul 2024 12:42:13 GMT",
"version": "v2"
}
] | 2024-07-10 | [
[
"Cai",
"Yong",
""
],
[
"Zhu",
"Mian",
""
],
[
"Piao",
"Yun-Song",
""
]
] | Primordial black holes (PBHs) and the violation of the null energy condition (NEC) have significant implications for our understanding of the very early universe. We present a novel approach to generate PBHs via the NEC violation in a single-field inflationary scenario. In our scenario, the universe transitions from a ... |
0903.2678 | Paul Wesson | Paul S. Wesson | Classical Universes and Quantized Particles from Five-Dimensional Null
Paths | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | All objects in 4D spacetime may in principle travel on null paths in a 5D
mani-fold. We use this, together with a change in the extra coordinate and the
signature of the metric, to construct a simple model of a classical universe
and a quantized particle. There are notable implications for the Weak
Equivalence Princi... | [
{
"created": "Sun, 15 Mar 2009 23:34:29 GMT",
"version": "v1"
}
] | 2009-03-17 | [
[
"Wesson",
"Paul S.",
""
]
] | All objects in 4D spacetime may in principle travel on null paths in a 5D mani-fold. We use this, together with a change in the extra coordinate and the signature of the metric, to construct a simple model of a classical universe and a quantized particle. There are notable implications for the Weak Equivalence Principl... |
2304.10030 | Anna Ijjas | Anna Ijjas | Slow Contraction and the Weyl Curvature Hypothesis | 5 pages, 5 figures | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the power of numerical relativity, we show that, beginning from generic
initial conditions that are far from flat, homogeneous and isotropic and have a
large Weyl curvature, a period of slow contraction rapidly drives spacetime
towards vanishingly small Weyl curvature as the total energy density grows,
thus pro... | [
{
"created": "Thu, 20 Apr 2023 01:01:46 GMT",
"version": "v1"
}
] | 2023-04-24 | [
[
"Ijjas",
"Anna",
""
]
] | Using the power of numerical relativity, we show that, beginning from generic initial conditions that are far from flat, homogeneous and isotropic and have a large Weyl curvature, a period of slow contraction rapidly drives spacetime towards vanishingly small Weyl curvature as the total energy density grows, thus provi... |
2204.07274 | Marc Holman | Marc Holman | Spatial Geometry of the Large-Scale Universe: The Role of Quantum
Gravity, Dark Energy and other Unknowns | 4 pages, 1 figure. Contribution to the 2022 Cosmology session of the
56th Rencontres de Moriond | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | It has been known for some time that the usual inference drawn from the
observed near-flatness of the large-scale Universe - namely the existence of a
cosmological "flatness problem", which is then taken as a partial, but key
motivation for assuming the existence of an ultra-short, inflationary expansion
of the very ... | [
{
"created": "Fri, 15 Apr 2022 00:17:40 GMT",
"version": "v1"
}
] | 2022-04-18 | [
[
"Holman",
"Marc",
""
]
] | It has been known for some time that the usual inference drawn from the observed near-flatness of the large-scale Universe - namely the existence of a cosmological "flatness problem", which is then taken as a partial, but key motivation for assuming the existence of an ultra-short, inflationary expansion of the very ea... |
2203.07074 | Ovidiu Racorean Mr | Ovidiu Racorean | The Born rule in a timeless universe | 14 page | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In canonical quantization of gravity the wave function of the universe is CPT
invariant. Thus, if the quantum state of the universe contains a particular
history, than it must contain, with the same probability, the time-reversed
image of that history as well. In this work, we investigate the meaning of this
statemen... | [
{
"created": "Fri, 11 Mar 2022 09:57:09 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Sep 2022 11:16:38 GMT",
"version": "v2"
}
] | 2022-09-14 | [
[
"Racorean",
"Ovidiu",
""
]
] | In canonical quantization of gravity the wave function of the universe is CPT invariant. Thus, if the quantum state of the universe contains a particular history, than it must contain, with the same probability, the time-reversed image of that history as well. In this work, we investigate the meaning of this statement ... |
gr-qc/0605029 | Tetsuya Shiromizu | Tetsuya Shiromizu, Sumio Yamada, Hirotaka Yoshino | On existence of matter outside a static black hole | 4pages, final version accepted for publication in Journal of
Mathematical Physics | J.Math.Phys.47:112502,2006 | 10.1063/1.2383009 | null | gr-qc astro-ph math.DG | null | It is expected that matter composed of a perfect fluid cannot be at rest
outside of a black hole if the spacetime is asymptotically flat and static
(non-rotating). However, there has not been a rigorous proof for this
expectation without assuming spheical symmetry. In this paper, we provide a
proof of non-existence o... | [
{
"created": "Fri, 5 May 2006 00:54:10 GMT",
"version": "v1"
},
{
"created": "Tue, 9 May 2006 23:11:34 GMT",
"version": "v2"
},
{
"created": "Thu, 5 Oct 2006 23:45:56 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Shiromizu",
"Tetsuya",
""
],
[
"Yamada",
"Sumio",
""
],
[
"Yoshino",
"Hirotaka",
""
]
] | It is expected that matter composed of a perfect fluid cannot be at rest outside of a black hole if the spacetime is asymptotically flat and static (non-rotating). However, there has not been a rigorous proof for this expectation without assuming spheical symmetry. In this paper, we provide a proof of non-existence of ... |
gr-qc/0311038 | Matthew R. Francis | Matthew R. Francis and Arthur Kosowsky | Geodesics in the Generalized Schwarzschild Solution | 7 pages, 1 figure; revised to reflect referee comments; submitted to
Am. J. of Phys | Am.J.Phys. 72 (2004) 1204-1209 | 10.1119/1.1701846 | null | gr-qc | null | Since Schwarzshild discovered the point-mass solution to Einstein's equations
that bears his name, many equivalent forms of the metric have been catalogued.
Using an elementary coordinate transformation, we derive the most general form
for the stationary, spherically-symmetric vacuum metric, which contains one
free f... | [
{
"created": "Wed, 12 Nov 2003 20:38:26 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Jan 2004 18:36:18 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Francis",
"Matthew R.",
""
],
[
"Kosowsky",
"Arthur",
""
]
] | Since Schwarzshild discovered the point-mass solution to Einstein's equations that bears his name, many equivalent forms of the metric have been catalogued. Using an elementary coordinate transformation, we derive the most general form for the stationary, spherically-symmetric vacuum metric, which contains one free fun... |
2102.01600 | A. Yu. Petrov | J. R. Nascimento, A. Yu. Petrov, P. J. Porf\'irio | On the causality properties in non-local gravity theories | 16 pages, version accepted to EPJ C | European Physical Journal C81, 815 (2021) | 10.1140/epjc/s10052-021-09640-5 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | It is well known that non-local theories of gravity have been a flourish
arena of studies for many reasons, for instance, the UV incompleteness of
General Relativity (GR). In this paper we check the consistency of
ST-homogeneous G\"{o}del-type metrics within the non-local gravity framework.
The non-local models consi... | [
{
"created": "Tue, 2 Feb 2021 16:51:44 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Sep 2021 16:11:13 GMT",
"version": "v2"
}
] | 2021-09-16 | [
[
"Nascimento",
"J. R.",
""
],
[
"Petrov",
"A. Yu.",
""
],
[
"Porfírio",
"P. J.",
""
]
] | It is well known that non-local theories of gravity have been a flourish arena of studies for many reasons, for instance, the UV incompleteness of General Relativity (GR). In this paper we check the consistency of ST-homogeneous G\"{o}del-type metrics within the non-local gravity framework. The non-local models conside... |
1812.06759 | Dmitry Chirkov | Dmitry Chirkov, Alexey Toporensky | Splitting into two isotropic subspaces as a result of cosmological
evolution in Einstein-Gauss-Bonnet gravity | 10 pages, 2 figures | Grav. Cosmol. Vol. 25, No. 3, p. 243 (2019) | 10.1134/S0202289319030058 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider numerically dynamics of a flat anisotropic Universe in
Einstein-Gauss-Bonnet gravity with positive $\Lambda$ in dimensionalities 5+1
and 6+1. We identify three possible outcomes of the evolution, one singular and
two nonsingular. First nonsingular outcome is oscillatory. Second is the known
exponential so... | [
{
"created": "Mon, 17 Dec 2018 13:40:35 GMT",
"version": "v1"
},
{
"created": "Fri, 3 May 2019 14:49:21 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Jul 2019 18:59:13 GMT",
"version": "v3"
}
] | 2019-07-25 | [
[
"Chirkov",
"Dmitry",
""
],
[
"Toporensky",
"Alexey",
""
]
] | We consider numerically dynamics of a flat anisotropic Universe in Einstein-Gauss-Bonnet gravity with positive $\Lambda$ in dimensionalities 5+1 and 6+1. We identify three possible outcomes of the evolution, one singular and two nonsingular. First nonsingular outcome is oscillatory. Second is the known exponential solu... |
gr-qc/9601024 | null | Enrico Montanari, Pierluigi Fortini (University of Ferrara and INFN
sezione di Ferrara, Italy) | Coherent interaction of a monochromatic gravitational wave with both
elastic bodies and electromagnetic circuits | RevTeX, 8 pages plus 2 postscript figures; widely revised text; noise
analisys enhanced. Approved for publication in Phys. Rev. D | Phys.Rev. D59 (1999) 024001 | 10.1103/PhysRevD.59.024001 | null | gr-qc astro-ph | null | The interaction of a gravitational wave with a system made of an RLC circuit
forming one end of a mechanical harmonic oscillator is investigated. We show
that, in some configurations, the coherent interaction of the wave with both
the mechanical oscillator and the RLC circuit gives rise to a mechanical
quality factor... | [
{
"created": "Wed, 17 Jan 1996 12:01:16 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Aug 1998 14:53:47 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Montanari",
"Enrico",
"",
"University of Ferrara and INFN\n sezione di Ferrara, Italy"
],
[
"Fortini",
"Pierluigi",
"",
"University of Ferrara and INFN\n sezione di Ferrara, Italy"
]
] | The interaction of a gravitational wave with a system made of an RLC circuit forming one end of a mechanical harmonic oscillator is investigated. We show that, in some configurations, the coherent interaction of the wave with both the mechanical oscillator and the RLC circuit gives rise to a mechanical quality factor i... |
gr-qc/0404044 | Belinch\'on Jos\'e Antonio | Jos\'e Antonio Belinch\'on and Antonio Alfonso-Faus | A Theory of time-varying Constants | 15 pages, RevTeX4 | Int.J.Mod.Phys. D10 (2001) 299-310 | 10.1142/S0218271801000974 | null | gr-qc | null | We present a flat (K=0) cosmological model, described by a perfect fluid with
the ``constants'' $G,c$ and $\Lambda$ varying with cosmological time $t$. We
introduce Planck\'s ``constant'' $\hbar$ in the field equations through the
equation of state for the energy density of radiation. We then determine the
behaviour ... | [
{
"created": "Fri, 9 Apr 2004 16:39:54 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Belinchón",
"José Antonio",
""
],
[
"Alfonso-Faus",
"Antonio",
""
]
] | We present a flat (K=0) cosmological model, described by a perfect fluid with the ``constants'' $G,c$ and $\Lambda$ varying with cosmological time $t$. We introduce Planck\'s ``constant'' $\hbar$ in the field equations through the equation of state for the energy density of radiation. We then determine the behaviour of... |
2308.11323 | Gast\'on Creci | Gast\'on Creci, Tanja Hinderer and Jan Steinhoff | Tidal properties of neutron stars in scalar-tensor theories of gravity | v2, 44 pages, 29 figures. Discussion, references and plots added | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A major science goal of gravitational-wave (GW) observations is to probe the
nature of gravity and constrain modifications to General Relativity. An
established class of modified gravity theories are scalar-tensor models, which
introduce an extra scalar degree of freedom. This affects the internal
structure of neutro... | [
{
"created": "Tue, 22 Aug 2023 09:55:38 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Oct 2023 12:31:47 GMT",
"version": "v2"
}
] | 2023-10-25 | [
[
"Creci",
"Gastón",
""
],
[
"Hinderer",
"Tanja",
""
],
[
"Steinhoff",
"Jan",
""
]
] | A major science goal of gravitational-wave (GW) observations is to probe the nature of gravity and constrain modifications to General Relativity. An established class of modified gravity theories are scalar-tensor models, which introduce an extra scalar degree of freedom. This affects the internal structure of neutron ... |
1112.2202 | Llu\'is Bel | Llu\'is Bel | OPERA and the GPS | 4 pages | null | null | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I comment about the adequacy of the GPS to model a particularly defined
synchronization in a rotating frame of reference described in a general
relativistic framework.
| [
{
"created": "Thu, 8 Dec 2011 07:35:08 GMT",
"version": "v1"
}
] | 2011-12-12 | [
[
"Bel",
"Lluís",
""
]
] | I comment about the adequacy of the GPS to model a particularly defined synchronization in a rotating frame of reference described in a general relativistic framework. |
2305.04709 | Argyro Sasli | Argyro Sasli, Nikolaos Karnesis, Nikolaos Stergioulas | Heavy-tailed likelihoods for robustness against data outliers:
Applications to the analysis of gravitational wave data | 18 pages, 7 figures, matches published version | Phys. Rev. D 108, 103005 (2023) | 10.1103/PhysRevD.108.103005 | null | gr-qc astro-ph.IM physics.data-an physics.space-ph | http://creativecommons.org/licenses/by/4.0/ | In recent years, the field of Gravitational Wave Astronomy has flourished.
With the advent of more sophisticated ground-based detectors and space-based
observatories, it is anticipated that Gravitational Wave events will be
detected at a much higher rate in the near future. One of the future data
analysis challenges ... | [
{
"created": "Mon, 8 May 2023 13:47:08 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Nov 2023 08:40:18 GMT",
"version": "v2"
}
] | 2023-11-07 | [
[
"Sasli",
"Argyro",
""
],
[
"Karnesis",
"Nikolaos",
""
],
[
"Stergioulas",
"Nikolaos",
""
]
] | In recent years, the field of Gravitational Wave Astronomy has flourished. With the advent of more sophisticated ground-based detectors and space-based observatories, it is anticipated that Gravitational Wave events will be detected at a much higher rate in the near future. One of the future data analysis challenges is... |
gr-qc/0001009 | null | Dan N. Vollick | Quantum Inequalities in Curved Two Dimensional Spacetimes | 10 pages, LaTeX | Phys.Rev. D61 (2000) 084022 | 10.1103/PhysRevD.61.084022 | null | gr-qc hep-th | null | In quantum field theory there exist states for which the energy density is
negative. It is important that these negative energy densities satisfy
constraints, such as quantum inequalities, to minimize possible violations of
causality, the second law of thermodynamics, and cosmic censorship. In this
paper I show that ... | [
{
"created": "Wed, 5 Jan 2000 23:20:07 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Vollick",
"Dan N.",
""
]
] | In quantum field theory there exist states for which the energy density is negative. It is important that these negative energy densities satisfy constraints, such as quantum inequalities, to minimize possible violations of causality, the second law of thermodynamics, and cosmic censorship. In this paper I show that co... |
1005.4926 | Stephan Schlamminger | Stephan Schlamminger, Charles A. Hagedorn, and Jens H. Gundlach | Indirect Evidence for L\'evy Walks in Squeeze Film Damping | 5 pages 5 figures accepted for PRD; typo in equation 3 and figure 1
fixed | Phys.Rev.D81:123008,2010 | 10.1103/PhysRevD.81.123008 | LIGO-P1000013 | gr-qc cond-mat.stat-mech physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Molecular flow gas damping of mechanical motion in confined geometries, and
its associated noise, is important in a variety of fields, including precision
measurement, gravitational wave detection, and MEMS devices. We used two
torsion balance instruments to measure the strength and distance-dependence of
`squeeze fi... | [
{
"created": "Wed, 26 May 2010 20:00:02 GMT",
"version": "v1"
},
{
"created": "Sat, 29 May 2010 04:43:17 GMT",
"version": "v2"
}
] | 2014-11-21 | [
[
"Schlamminger",
"Stephan",
""
],
[
"Hagedorn",
"Charles A.",
""
],
[
"Gundlach",
"Jens H.",
""
]
] | Molecular flow gas damping of mechanical motion in confined geometries, and its associated noise, is important in a variety of fields, including precision measurement, gravitational wave detection, and MEMS devices. We used two torsion balance instruments to measure the strength and distance-dependence of `squeeze film... |
gr-qc/0612154 | Farook Rahaman | F.Rahaman, A. Ghosh and M. Kalam | Does phantom energy produce black hole? | 5 pages. Published in Nuovo Cimento 121B, 279 (2006) | NuovoCim.B121:279,2006 | 10.1393/ncb/i2006-10033-x | null | gr-qc | null | We have found an exact solution of spherically symmetrical Einstein equations
describing a black hole with a special type phantom energy source. It is
surprising to note that our solution is analogous to Reissner-Nordstr\"{o}m
black hole.
| [
{
"created": "Sat, 23 Dec 2006 12:49:11 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Rahaman",
"F.",
""
],
[
"Ghosh",
"A.",
""
],
[
"Kalam",
"M.",
""
]
] | We have found an exact solution of spherically symmetrical Einstein equations describing a black hole with a special type phantom energy source. It is surprising to note that our solution is analogous to Reissner-Nordstr\"{o}m black hole. |
gr-qc/9711070 | Sumati Surya | Fay Dowker (Imperial Coll., London) and Sumati Surya (I.U.C.A.A.,
Pune) | Topology Change and Causal Continuity | Latex, 28 pages, 10 figures, small changes in text (one figure
removed), conclusions remain unchanged. Accepted for publication in Physical
Review D | Phys. Rev. D 58, 124019 (1998) | 10.1103/PhysRevD.58.124019 | Imperial/TP/97 -98/12 | gr-qc hep-th | null | The result that, for a scalar quantum field propagating on a ``trousers''
topology in 1+1 dimensions, the crotch singularity is a source for an infinite
burst of energy has been used to argue against the occurrence of topology
change in quantum gravity. We draw attention to a conjecture due to Sorkin that
it may be t... | [
{
"created": "Sun, 23 Nov 1997 13:07:12 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Aug 1998 10:54:35 GMT",
"version": "v2"
}
] | 2016-08-25 | [
[
"Dowker",
"Fay",
"",
"Imperial Coll., London"
],
[
"Surya",
"Sumati",
"",
"I.U.C.A.A.,\n Pune"
]
] | The result that, for a scalar quantum field propagating on a ``trousers'' topology in 1+1 dimensions, the crotch singularity is a source for an infinite burst of energy has been used to argue against the occurrence of topology change in quantum gravity. We draw attention to a conjecture due to Sorkin that it may be the... |
gr-qc/0606069 | Alok Laddha | Alok Laddha | Polymer quantization of CGHS model- I | 50 pages, 2 figures | Class.Quant.Grav.24:4969-4988,2007 | 10.1088/0264-9381/24/20/005 | IMSc/2006/6/16 | gr-qc | null | We present a polymer(loop) quantization of a two dimensional theory of
dilatonic gravity known as the CGHS model. We recast the theory as a
parametrized free field theory on a flat 2-dimensional spacetime and quantize
the resulting phase space using techniques of loop quantization. The resulting
(kinematical) Hilbert... | [
{
"created": "Fri, 16 Jun 2006 09:42:10 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Laddha",
"Alok",
""
]
] | We present a polymer(loop) quantization of a two dimensional theory of dilatonic gravity known as the CGHS model. We recast the theory as a parametrized free field theory on a flat 2-dimensional spacetime and quantize the resulting phase space using techniques of loop quantization. The resulting (kinematical) Hilbert s... |
gr-qc/0101118 | Maurizio Gasperini | G. De Risi and M. Gasperini | A diagrammatic approach to the spectrum of cosmological perturbations | 12 pages, Latex, four figures included using epsfig. To appear in
Phys. Lett. B | Phys.Lett. B503 (2001) 140-146 | 10.1016/S0370-2693(01)00220-9 | BA-TH/00-398 | gr-qc hep-th | null | We compute the spectral distribution of the quantum fluctuations of the
vacuum, amplified by inflation, after an arbitrary number of background
transitions. Using a graphic representation of the process we find that the
final spectrum can be completely determined trough a synthetic set of working
rules, and a list of... | [
{
"created": "Tue, 30 Jan 2001 15:11:08 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"De Risi",
"G.",
""
],
[
"Gasperini",
"M.",
""
]
] | We compute the spectral distribution of the quantum fluctuations of the vacuum, amplified by inflation, after an arbitrary number of background transitions. Using a graphic representation of the process we find that the final spectrum can be completely determined trough a synthetic set of working rules, and a list of s... |
2105.00360 | Eleonora Giovannetti | E. Giovannetti, G. Montani, S. Schiattarella | Semiclassical and quantum features of the Bianchi I cosmology in the
polymer representation | null | Phys. Rev. D 105, 064011 Published 7 March 2022 | 10.1103/PhysRevD.105.064011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the Bianchi I cosmology in the presence of a massless scalar field
and describe its dynamics via a semiclassical and quantum polymer approach. We
study the morphology of the Big Bounce by adopting three different sets of
configurational variables: the Ashtekar connections, a set of anisotropic
volume-like ... | [
{
"created": "Sun, 2 May 2021 00:03:27 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Aug 2021 21:01:58 GMT",
"version": "v2"
},
{
"created": "Tue, 8 Mar 2022 13:54:19 GMT",
"version": "v3"
}
] | 2022-03-09 | [
[
"Giovannetti",
"E.",
""
],
[
"Montani",
"G.",
""
],
[
"Schiattarella",
"S.",
""
]
] | We analyze the Bianchi I cosmology in the presence of a massless scalar field and describe its dynamics via a semiclassical and quantum polymer approach. We study the morphology of the Big Bounce by adopting three different sets of configurational variables: the Ashtekar connections, a set of anisotropic volume-like co... |
1604.00495 | Gon\c{c}alo Quinta | Gon\c{c}alo M. Quinta, Antonino Flachi, Jos\'e P. S. Lemos | Vacuum polarization in asymptotically Lifshitz black holes | null | Phys. Rev. D 93, 124073 (2016) | 10.1103/PhysRevD.93.124073 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There has been considerable interest in applying the gauge/gravity duality to
condensed matter theories with particular attention being devoted to gravity
duals (Lifshitz spacetimes) of theories that exhibit anisotropic scaling. In
this context, black hole solutions with Lifshitz asymptotics have also been
constructe... | [
{
"created": "Sat, 2 Apr 2016 12:40:02 GMT",
"version": "v1"
}
] | 2016-07-06 | [
[
"Quinta",
"Gonçalo M.",
""
],
[
"Flachi",
"Antonino",
""
],
[
"Lemos",
"José P. S.",
""
]
] | There has been considerable interest in applying the gauge/gravity duality to condensed matter theories with particular attention being devoted to gravity duals (Lifshitz spacetimes) of theories that exhibit anisotropic scaling. In this context, black hole solutions with Lifshitz asymptotics have also been constructed ... |
1302.0093 | Andrew Makarenko | Salvatore Capozziello, Andrey N. Makarenko and Sergei D. Odintsov | Gauss-Bonnet dark energy by Lagrange multipliers | 14 pages, expanded version to appear in PRD | Phys. Rev. D 87, 084037 (2013) | 10.1103/PhysRevD.87.084037 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A string-inspired effective theory of gravity, containing Gauss-Bonnet
invariant interacting with a scalar field, is considered in view of obtaining
cosmological dark energy solutions. A Lagrange multiplier is inserted into the
action in order to achieve the cosmological reconstruction by selecting
suitable forms of ... | [
{
"created": "Fri, 1 Feb 2013 06:38:53 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Mar 2013 13:05:16 GMT",
"version": "v2"
}
] | 2013-04-23 | [
[
"Capozziello",
"Salvatore",
""
],
[
"Makarenko",
"Andrey N.",
""
],
[
"Odintsov",
"Sergei D.",
""
]
] | A string-inspired effective theory of gravity, containing Gauss-Bonnet invariant interacting with a scalar field, is considered in view of obtaining cosmological dark energy solutions. A Lagrange multiplier is inserted into the action in order to achieve the cosmological reconstruction by selecting suitable forms of co... |
gr-qc/9804041 | Jun'ichi Yokoyama | Jun'ichi Yokoyama (Stanford U. and Yukawa Institute, Kyoto U.) | Cosmological constraints on primordial black holes produced in the
near-critical gravitational collapse | 9 pages. Typos corrected. To appear in Physical Review D | Phys.Rev.D58:107502,1998 | 10.1103/PhysRevD.58.107502 | SU-ITP 98/18, YITP-98-23 | gr-qc astro-ph | null | The mass function of primordial black holes created through the near-critical
gravitational collapse is calculated in a manner fairly independent of the
statistical distribution of underlying density fluctuation, assuming that it
has a sharp peak on a specific scale. Comparing it with various cosmological
constraints... | [
{
"created": "Sat, 18 Apr 1998 01:43:47 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Jul 1998 18:01:22 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Yokoyama",
"Jun'ichi",
"",
"Stanford U. and Yukawa Institute, Kyoto U."
]
] | The mass function of primordial black holes created through the near-critical gravitational collapse is calculated in a manner fairly independent of the statistical distribution of underlying density fluctuation, assuming that it has a sharp peak on a specific scale. Comparing it with various cosmological constraints o... |
1606.07924 | Jian-Yang Zhu | Long Chen and Jian-Yang Zhu | Inflationary spectra from a near $\Omega$-deformed space-time transition
point in Loop Quantum Cosmology | 7 pages,the final version published in PRD | Physical Review D 94,064037(2016) | 10.1103/PhysRevD.94.064037 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Anomaly-free perturbations of loop quantum cosmology with holonomy
corrections reveal an $\Omega$ -deformed spacetime structure,
$\Omega:=1-2\rho/\rho_c$, where $\Omega<0$ indicates a Euclidean-like space and
$\Omega>0$ indicates a Lorentz-like space. It would be reasonable to give the
initial value at the spacetime ... | [
{
"created": "Sat, 25 Jun 2016 16:02:27 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Sep 2016 15:21:51 GMT",
"version": "v2"
}
] | 2016-12-21 | [
[
"Chen",
"Long",
""
],
[
"Zhu",
"Jian-Yang",
""
]
] | Anomaly-free perturbations of loop quantum cosmology with holonomy corrections reveal an $\Omega$ -deformed spacetime structure, $\Omega:=1-2\rho/\rho_c$, where $\Omega<0$ indicates a Euclidean-like space and $\Omega>0$ indicates a Lorentz-like space. It would be reasonable to give the initial value at the spacetime tr... |
0806.3844 | Ion I. Cot{\ba}escu | Ion I Cotaescu | On the universality of the Carter and McLenaghan formula | 7 pages, no figures | Europhys.Lett.86:20003,2009 | 10.1209/0295-5075/86/20003 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that the formula of the isometry generators of the spinor
representation given by Carter and McLenaghan is universal in the sense that
this holds for any representation either in local frames or even in natural
ones. The point-dependent spin matrices in natural frames are introduced for
any tensor represe... | [
{
"created": "Tue, 24 Jun 2008 09:42:18 GMT",
"version": "v1"
}
] | 2014-10-08 | [
[
"Cotaescu",
"Ion I",
""
]
] | It is shown that the formula of the isometry generators of the spinor representation given by Carter and McLenaghan is universal in the sense that this holds for any representation either in local frames or even in natural ones. The point-dependent spin matrices in natural frames are introduced for any tensor represent... |
gr-qc/9905022 | Roberto Scipioni | Roberto Scipioni | Isomorphism between Non-Riemannian gravity and Einstein-Proca-Weyl
theories extended to a class of Scalar gravity theories | 13 pages, tex file, accepted in Class. Quant. Grav | Class.Quant.Grav. 16 (1999) 2471-2478 | 10.1088/0264-9381/16/7/320 | null | gr-qc math-ph math.MP | null | We extend the recently proved relation between certain models of
Non-Riemannian gravitation and Einstein- Proca-Weyl theories to a class of
Scalar gravity theories. This is used to present a Black-Hole Dilaton solution
with non-Riemannian connection.
| [
{
"created": "Thu, 6 May 1999 21:18:21 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Scipioni",
"Roberto",
""
]
] | We extend the recently proved relation between certain models of Non-Riemannian gravitation and Einstein- Proca-Weyl theories to a class of Scalar gravity theories. This is used to present a Black-Hole Dilaton solution with non-Riemannian connection. |
2307.10986 | Pabitra Tripathy | Pabitra Tripathy, Pritam Nanda, Amit Ghosh | Local first law of black hole | null | Gen Relativ Gravit 56, 54 (2024) | 10.1007/s10714-024-03243-7 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We investigated the form and implications of the local first law of black
hole thermodynamics in relation to an observer located at a finite distance
from the black hole horizon. Our study is based on the quasilocal form of the
first law for black hole thermodynamics, given by $\delta
E=\frac{\bar{\kappa}}{8\pi}\delt... | [
{
"created": "Thu, 20 Jul 2023 16:16:08 GMT",
"version": "v1"
}
] | 2024-05-08 | [
[
"Tripathy",
"Pabitra",
""
],
[
"Nanda",
"Pritam",
""
],
[
"Ghosh",
"Amit",
""
]
] | We investigated the form and implications of the local first law of black hole thermodynamics in relation to an observer located at a finite distance from the black hole horizon. Our study is based on the quasilocal form of the first law for black hole thermodynamics, given by $\delta E=\frac{\bar{\kappa}}{8\pi}\delta ... |
1203.6443 | Manuel Tiglio | Olivier Sarbach and Manuel Tiglio | Continuum and Discrete Initial-Boundary-Value Problems and Einstein's
Field Equations | To appear in Living Reviews in Relativity, 191 pages | null | 10.12942/lrr-2012-9 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Many evolution problems in physics are described by partial differential
equations on an infinite domain; therefore, one is interested in the solutions
to such problems for a given initial dataset. A prominent example is the binary
black hole problem within Einstein's theory of gravitation, in which one
computes the ... | [
{
"created": "Thu, 29 Mar 2012 06:49:17 GMT",
"version": "v1"
}
] | 2015-06-04 | [
[
"Sarbach",
"Olivier",
""
],
[
"Tiglio",
"Manuel",
""
]
] | Many evolution problems in physics are described by partial differential equations on an infinite domain; therefore, one is interested in the solutions to such problems for a given initial dataset. A prominent example is the binary black hole problem within Einstein's theory of gravitation, in which one computes the gr... |
1010.5279 | Leonardo Castaneda | Alejandro Guarnizo, Leonardo Castaneda, Juan M. Tejeiro | Geodesic Deviation Equation in f(R) Gravity | 13 pages, 1 figure. Accepted for publication in General Relativity
and Gravitation | Gen.Rel.Grav.43:2713-2728,2011 | 10.1007/s10714-011-1194-6 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the Geodesic Deviation Equation (GDE) in metric f(R)
gravity. We start giving a brief introduction of the GDE in General Relativity
in the case of the standard cosmology. Next we generalize the GDE for metric
f(R) gravity using again the FLRW metric. A generalization of the Mattig
relation is a... | [
{
"created": "Mon, 25 Oct 2010 22:44:40 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Nov 2010 17:01:41 GMT",
"version": "v2"
},
{
"created": "Tue, 3 May 2011 21:18:08 GMT",
"version": "v3"
}
] | 2011-09-30 | [
[
"Guarnizo",
"Alejandro",
""
],
[
"Castaneda",
"Leonardo",
""
],
[
"Tejeiro",
"Juan M.",
""
]
] | In this paper we study the Geodesic Deviation Equation (GDE) in metric f(R) gravity. We start giving a brief introduction of the GDE in General Relativity in the case of the standard cosmology. Next we generalize the GDE for metric f(R) gravity using again the FLRW metric. A generalization of the Mattig relation is als... |
gr-qc/9809071 | Coule D. H. | D.H. Coule | Achieving pole-law inflation:the extreme inflation | 12 pages | Phys.Lett. B450 (1999) 48-54 | 10.1016/S0370-2693(99)00143-4 | null | gr-qc | null | The pre-big bang's inflationary mechanism, when allowance is made for the
rapid change of Newton's constant, is not actually of pole-law form . We give
examples where pole-law inflation, which requires violation of the weak-energy
condition, is possible but unlikely due to its very unstable character.
| [
{
"created": "Thu, 24 Sep 1998 16:57:49 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Coule",
"D. H.",
""
]
] | The pre-big bang's inflationary mechanism, when allowance is made for the rapid change of Newton's constant, is not actually of pole-law form . We give examples where pole-law inflation, which requires violation of the weak-energy condition, is possible but unlikely due to its very unstable character. |
2405.19196 | Igor Bogush Dr. | Igor Bogush, Dmitri Gal'tsov, G\'erard Cl\'ement | Mass formulas for supergravity black holes with string singularities | 13 pages, revtex4 | null | null | LAPTH-029/24 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the derivation of mass formulas for stationary axisymmetric
asymptotically locally flat solutions with string singularities on the polar
axis to general supergravity actions containing vector and scalar fields. It is
based on the rod structure of the solutions in Weyl coordinates and is
applicable to black ... | [
{
"created": "Wed, 29 May 2024 15:37:23 GMT",
"version": "v1"
}
] | 2024-05-30 | [
[
"Bogush",
"Igor",
""
],
[
"Gal'tsov",
"Dmitri",
""
],
[
"Clément",
"Gérard",
""
]
] | We extend the derivation of mass formulas for stationary axisymmetric asymptotically locally flat solutions with string singularities on the polar axis to general supergravity actions containing vector and scalar fields. It is based on the rod structure of the solutions in Weyl coordinates and is applicable to black ho... |
1806.10126 | Sebastien Renaux-Petel | Lucas Pinol, S\'ebastien Renaux-Petel, Yuichiro Tada | Inflationary stochastic anomalies | 9 pages, 2 figures, additional numerical results, version published
as a Letter in Classical and Quantum Gravity | null | 10.1088/1361-6382/ab097f | null | gr-qc astro-ph.CO cond-mat.stat-mech hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The stochastic approach aims at describing the long-wavelength part of
quantum fields during inflation by a classical stochastic theory. It is usually
formulated in terms of Langevin equations, giving rise to a Fokker-Planck
equation for the probability distribution function of the fields, and possibly
their momenta.... | [
{
"created": "Tue, 26 Jun 2018 17:51:42 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Feb 2019 14:26:47 GMT",
"version": "v2"
}
] | 2019-05-22 | [
[
"Pinol",
"Lucas",
""
],
[
"Renaux-Petel",
"Sébastien",
""
],
[
"Tada",
"Yuichiro",
""
]
] | The stochastic approach aims at describing the long-wavelength part of quantum fields during inflation by a classical stochastic theory. It is usually formulated in terms of Langevin equations, giving rise to a Fokker-Planck equation for the probability distribution function of the fields, and possibly their momenta. T... |
gr-qc/0011030 | Modanese Giovanni | G. Modanese (Univ. of Bolzano and CIPA - Palo Alto) | The dipolar zero-modes of Einstein action: An informal summary with some
new issues | LaTeX, 8 pages. To appear in the proceedings of "Gravitation and
Cosmology: from the Hubble Radius to the Planck Scale. A Symposium in
Celebration of the 80th Birthday of Jean-Pierre Vigier", World Scientific
Editor | In "Gravitation and Cosmology: from the Hubble Radius to the
Planck Scale", edited by R.L. Amoroso, G. Hunter, M. Kafatos, J.-P. Vigier,
p. 259-266 (Kluwer Academic Publishers, Dordrecht, 2002) | null | null | gr-qc | null | We recall the main features of metric vacuum fluctuations which have the
global property int d^4x sqrt{g(x)} R(x) = 0, even though R(x) does not vanish
locally. We stress that these fluctuations could mediate an anomalous coupling
between the gravitational field and coherent matter. Some new issues are
discussed: (1)... | [
{
"created": "Wed, 8 Nov 2000 01:35:04 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Modanese",
"G.",
"",
"Univ. of Bolzano and CIPA - Palo Alto"
]
] | We recall the main features of metric vacuum fluctuations which have the global property int d^4x sqrt{g(x)} R(x) = 0, even though R(x) does not vanish locally. We stress that these fluctuations could mediate an anomalous coupling between the gravitational field and coherent matter. Some new issues are discussed: (1) t... |
0711.2198 | Stefano Ansoldi | Stefano Ansoldi, Eduardo I. Guendelman and Idan Shilon | Stability, Singularities and Mass Thresholds in Child Universe
Production: a concise survey including some recent results and prospects | 19 pages LaTeX, including 68 references; to appear in the Proceedings
of "BH2, Dynamics and Thermodynamics of Blackholes and Naked Singularities",
May 10-12 2007, Milano, Italy; conference website:
http://www.mate.polimi.it/bh2 | null | null | KUNS-2109 | gr-qc hep-th | null | We present a review of selected topics concerning the creation and evolution
of child universes, together with a concise account of some recent progress in
the field.
| [
{
"created": "Wed, 14 Nov 2007 13:40:12 GMT",
"version": "v1"
}
] | 2007-12-10 | [
[
"Ansoldi",
"Stefano",
""
],
[
"Guendelman",
"Eduardo I.",
""
],
[
"Shilon",
"Idan",
""
]
] | We present a review of selected topics concerning the creation and evolution of child universes, together with a concise account of some recent progress in the field. |
0710.3108 | Andrew Moylan | Andrew J. Moylan, Susan M. Scott and Antony C. Searle | Functional programming framework for GRworkbench | null | Gen.Rel.Grav.37:1517-1528,2005 | 10.1007/s10714-005-0132-x | null | gr-qc | null | The software tool GRworkbench is an ongoing project in visual, numerical
General Relativity at The Australian National University. Recently, the
numerical differential geometric engine of GRworkbench has been rewritten using
functional programming techniques. By allowing functions to be directly
represented as progra... | [
{
"created": "Tue, 16 Oct 2007 16:17:17 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Moylan",
"Andrew J.",
""
],
[
"Scott",
"Susan M.",
""
],
[
"Searle",
"Antony C.",
""
]
] | The software tool GRworkbench is an ongoing project in visual, numerical General Relativity at The Australian National University. Recently, the numerical differential geometric engine of GRworkbench has been rewritten using functional programming techniques. By allowing functions to be directly represented as program ... |
gr-qc/0310099 | Takashi Tamaki | Takashi Tamaki | Black hole solutions coupled to Born-Infeld electrodynamics with
derivative corrections | 5 pages, 5 figures, explanation improved | JCAP0405:004,2004 | 10.1088/1475-7516/2004/05/004 | KUNS-1878 | gr-qc hep-th | null | We investigate black hole solutions in the Einstein-Born-Infeld system. We
clarify the role played by derivative corrections to the Born-Infeld (BI)
action. The qulitative differences from the case without derivative corrections
are: (i) there is no particlelike solution. (ii) the existence of the inner
horizon is re... | [
{
"created": "Mon, 20 Oct 2003 09:38:05 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Dec 2003 10:10:35 GMT",
"version": "v2"
},
{
"created": "Wed, 17 Mar 2004 04:27:56 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Tamaki",
"Takashi",
""
]
] | We investigate black hole solutions in the Einstein-Born-Infeld system. We clarify the role played by derivative corrections to the Born-Infeld (BI) action. The qulitative differences from the case without derivative corrections are: (i) there is no particlelike solution. (ii) the existence of the inner horizon is rest... |
1105.5927 | Aur\'elien Hees | Aurelien Hees, Peter Wolf, Brahim Lamine, Serge Reynaud, Marc-Thierry
Jaekel, Christophe Le Poncin-Lafitte, Valery Lainey, Andre Fuzfa, Veronique
Dehant | Radioscience simulations in General Relativity and in alternative
theories of gravity | 4 pages; Proceedings of "Les Rencontres de Moriond 2011 - Gravitation
session" | Experimental Gravity and Gravitational Waves, p.259-262 (Th\'e
Gioi, 2011) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this communication, we focus on the possibility to test GR with
radioscience experiments. We present a new software that in a first step
simulates the Range/Doppler signals directly from the space time metric (thus
in GR and in alternative theories of gravity). In a second step, a
least-squares fit of the involved... | [
{
"created": "Mon, 30 May 2011 10:15:05 GMT",
"version": "v1"
}
] | 2014-09-16 | [
[
"Hees",
"Aurelien",
""
],
[
"Wolf",
"Peter",
""
],
[
"Lamine",
"Brahim",
""
],
[
"Reynaud",
"Serge",
""
],
[
"Jaekel",
"Marc-Thierry",
""
],
[
"Poncin-Lafitte",
"Christophe Le",
""
],
[
"Lainey",
"Valery",
... | In this communication, we focus on the possibility to test GR with radioscience experiments. We present a new software that in a first step simulates the Range/Doppler signals directly from the space time metric (thus in GR and in alternative theories of gravity). In a second step, a least-squares fit of the involved p... |
2307.13071 | Betti Hartmann | Yves Brihaye (University of Mons, Belgium) and Betti Hartmann
(Department of Mathematics UCL, UK) | Note on super-critical charged boson stars | v2: results on black holes added | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We study the transition of charged boson stars from sub- to
super-criticality. This transition is defined as that choice of coupling
constants for which the Coulomb repulsion of two individual bosons (that make
up the star) exactly cancels their gravitational attraction. It was recently
shown that without self-intera... | [
{
"created": "Mon, 24 Jul 2023 18:51:52 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Sep 2023 12:18:26 GMT",
"version": "v2"
}
] | 2023-09-04 | [
[
"Brihaye",
"Yves",
"",
"University of Mons, Belgium"
],
[
"Hartmann",
"Betti",
"",
"Department of Mathematics UCL, UK"
]
] | We study the transition of charged boson stars from sub- to super-criticality. This transition is defined as that choice of coupling constants for which the Coulomb repulsion of two individual bosons (that make up the star) exactly cancels their gravitational attraction. It was recently shown that without self-interact... |
1503.06238 | Sergei Kopeikin | Kopeikin S.M. (University of Missouri, USA) and Han W.-B. (Shanghai
Astronomical Observatory, China) | The Fresnel-Fizeau effect and the atmospheric time delay in geodetic
VLBI | 6 pages, 1 figure, submitted to the Journal of Geodesy | Journal of Geodesy, April 2015, pp. 1-6 | 10.1007/s00190-015-0812-6 | null | gr-qc physics.ao-ph physics.geo-ph physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Fresnel-Fizeau effect is a special relativistic effect that makes the
speed of light dependent on the velocity of a transparent, moving medium. We
present a theoretical formalism for discussing propagation of electromagnetic
signals through the moving Earth atmosphere with taking into account the
Fresnel-Fizeau e... | [
{
"created": "Fri, 20 Mar 2015 21:56:35 GMT",
"version": "v1"
}
] | 2015-05-15 | [
[
"M.",
"Kopeikin S.",
"",
"University of Missouri, USA"
],
[
"-B.",
"Han W.",
"",
"Shanghai\n Astronomical Observatory, China"
]
] | The Fresnel-Fizeau effect is a special relativistic effect that makes the speed of light dependent on the velocity of a transparent, moving medium. We present a theoretical formalism for discussing propagation of electromagnetic signals through the moving Earth atmosphere with taking into account the Fresnel-Fizeau eff... |
1703.00447 | Vincent Vennin | Julien Grain, Vincent Vennin | Stochastic inflation in phase space: Is slow roll a stochastic
attractor? | Typo corrected in Eq. (3.45) and corrections propagated below,
conclusions unchanged. Changes made after publication | null | 10.1088/1475-7516/2017/05/045 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An appealing feature of inflationary cosmology is the presence of a
phase-space attractor, "slow roll", which washes out the dependence on initial
field velocities. We investigate the robustness of this property under
backreaction from quantum fluctuations using the stochastic inflation formalism
in the phase-space a... | [
{
"created": "Wed, 1 Mar 2017 17:50:36 GMT",
"version": "v1"
},
{
"created": "Tue, 23 May 2017 06:42:24 GMT",
"version": "v2"
},
{
"created": "Wed, 27 Sep 2017 13:54:09 GMT",
"version": "v3"
},
{
"created": "Fri, 2 Apr 2021 14:26:30 GMT",
"version": "v4"
}
] | 2021-04-05 | [
[
"Grain",
"Julien",
""
],
[
"Vennin",
"Vincent",
""
]
] | An appealing feature of inflationary cosmology is the presence of a phase-space attractor, "slow roll", which washes out the dependence on initial field velocities. We investigate the robustness of this property under backreaction from quantum fluctuations using the stochastic inflation formalism in the phase-space app... |
gr-qc/0309003 | Anzhong Wang | Anzhong Wang | Comment on "Absence of trapped surfaces and singularities in cylindrical
collapse" | latex, 2 figures, the last version to appear in Phys. Rev. D | Phys.Rev.D72:108501,2005 | 10.1103/PhysRevD.72.108501 | null | gr-qc astro-ph hep-th math-ph math.MP | null | Recently, the gravitational collapse of an infinite cylindrical thin shell of
matter in an otherwise empty spacetime with two hypersurface orthogonal Killing
vectors was studied by Gon\c{c}alves [Phys. Rev. {\bf D65}, 084045 (2002).]. By
using three "alternative" criteria for trapped surfaces, the author claimed to
h... | [
{
"created": "Sat, 30 Aug 2003 20:08:25 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Oct 2005 21:29:17 GMT",
"version": "v2"
}
] | 2009-07-07 | [
[
"Wang",
"Anzhong",
""
]
] | Recently, the gravitational collapse of an infinite cylindrical thin shell of matter in an otherwise empty spacetime with two hypersurface orthogonal Killing vectors was studied by Gon\c{c}alves [Phys. Rev. {\bf D65}, 084045 (2002).]. By using three "alternative" criteria for trapped surfaces, the author claimed to hav... |
1409.0202 | Katsuki Aoki | Katsuki Aoki and Kei-ichi Maeda | Dark matter in ghost-free bigravity theory: From a galaxy scale to the
universe | 15 pages, 7 figures, minor changes, references added | Phys. Rev. D 90, 124089 (2014) | 10.1103/PhysRevD.90.124089 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the origin of dark matter based on the ghost-free bigravity theory
with twin matter fluids. The present cosmic acceleration can be explained by
the existence of graviton mass, while dark matter is required in several
cosmological situations [the galactic missing mass, the cosmic structure
formation and the s... | [
{
"created": "Sun, 31 Aug 2014 10:33:26 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Sep 2014 15:49:44 GMT",
"version": "v2"
}
] | 2015-01-07 | [
[
"Aoki",
"Katsuki",
""
],
[
"Maeda",
"Kei-ichi",
""
]
] | We study the origin of dark matter based on the ghost-free bigravity theory with twin matter fluids. The present cosmic acceleration can be explained by the existence of graviton mass, while dark matter is required in several cosmological situations [the galactic missing mass, the cosmic structure formation and the sta... |
2404.14621 | Hristu Culetu | Hristu Culetu | On geodesics in spherical Rindler space | 7 pages, no figures, references added | null | 10.1142/S0219887824502438 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The geodesics in various spherical Rindler frames are investigated. A display
of some kinematical quantities of the spacetime is given. The constant
acceleration from the metric acts as the surface gravity of the horizon $r =
0$. The radial geodesics are computed both for the Balasubramanian et al. form
of the spheri... | [
{
"created": "Mon, 22 Apr 2024 23:13:42 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Jul 2024 08:31:32 GMT",
"version": "v2"
}
] | 2024-07-04 | [
[
"Culetu",
"Hristu",
""
]
] | The geodesics in various spherical Rindler frames are investigated. A display of some kinematical quantities of the spacetime is given. The constant acceleration from the metric acts as the surface gravity of the horizon $r = 0$. The radial geodesics are computed both for the Balasubramanian et al. form of the spherica... |
1609.07814 | Francisco Jos\'e Maldonado Torralba | J. A. R. Cembranos, J. Gigante Valcarcel, F. J. Maldonado Torralba | Singularities and n-dimensional black holes in torsion theories | 11 pages, 0 figures, minor changes, references added. It matches the
version published in JCAP | JCAP04(2017)021 | 10.1088/1475-7516/2017/04/021 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we have studied the singular behaviour of gravitational theories
with non symmetric connections. For this purpose we introduce a new criteria
for the appearance of singularities based on the existence of black/white hole
regions of arbitrary codimension defined inside a spacetime of arbitrary
dimension. ... | [
{
"created": "Sun, 25 Sep 2016 22:30:16 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Apr 2017 17:06:06 GMT",
"version": "v2"
}
] | 2017-04-12 | [
[
"Cembranos",
"J. A. R.",
""
],
[
"Valcarcel",
"J. Gigante",
""
],
[
"Torralba",
"F. J. Maldonado",
""
]
] | In this work we have studied the singular behaviour of gravitational theories with non symmetric connections. For this purpose we introduce a new criteria for the appearance of singularities based on the existence of black/white hole regions of arbitrary codimension defined inside a spacetime of arbitrary dimension. We... |
1411.6286 | Emanuele Berti | Hector O. Silva, Caio F. B. Macedo, Emanuele Berti, Lu\'is C. B.
Crispino | Slowly Rotating Anisotropic Neutron Stars in General Relativity and
Scalar-Tensor Theory | 19 pages, 7 figures, 1 table. Matches version in press in CQG. Fixed
small typos | null | null | null | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Some models (such as the Skyrme model, a low-energy effective field theory
for QCD) suggest that the high-density matter prevailing in neutron star
interiors may be significantly anisotropic. Anisotropy is known to affect the
bulk properties of nonrotating neutron stars in General Relativity. In this
paper we study t... | [
{
"created": "Sun, 23 Nov 2014 19:15:22 GMT",
"version": "v1"
},
{
"created": "Mon, 11 May 2015 18:26:51 GMT",
"version": "v2"
},
{
"created": "Thu, 4 Jun 2015 15:58:35 GMT",
"version": "v3"
}
] | 2015-06-05 | [
[
"Silva",
"Hector O.",
""
],
[
"Macedo",
"Caio F. B.",
""
],
[
"Berti",
"Emanuele",
""
],
[
"Crispino",
"Luís C. B.",
""
]
] | Some models (such as the Skyrme model, a low-energy effective field theory for QCD) suggest that the high-density matter prevailing in neutron star interiors may be significantly anisotropic. Anisotropy is known to affect the bulk properties of nonrotating neutron stars in General Relativity. In this paper we study the... |
1102.3456 | Johan Brannlund | A. Coley, J. Brannlund, J. Latta | Unimodular Gravity and Averaging | 10 pages | null | 10.4236/jmp.2012.33036 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The question of the averaging of inhomogeneous spacetimes in cosmology is
important for the correct interpretation of cosmological data. In this paper we
suggest a conceptually simpler approach to averaging in cosmology based on the
averaging of scalars within unimodular gravity. As an illustration, we consider
the e... | [
{
"created": "Wed, 16 Feb 2011 23:44:45 GMT",
"version": "v1"
}
] | 2015-05-27 | [
[
"Coley",
"A.",
""
],
[
"Brannlund",
"J.",
""
],
[
"Latta",
"J.",
""
]
] | The question of the averaging of inhomogeneous spacetimes in cosmology is important for the correct interpretation of cosmological data. In this paper we suggest a conceptually simpler approach to averaging in cosmology based on the averaging of scalars within unimodular gravity. As an illustration, we consider the exa... |
gr-qc/9903080 | Giovanni Amelino-Camelia | Giovanni Amelino-Camelia | Gravity-wave interferometers as probes of a low-energy effective quantum
gravity | LaTex, 33 pages | Phys.Rev. D62 (2000) 024015 | 10.1103/PhysRevD.62.024015 | CERN-TH/99-70 | gr-qc astro-ph hep-ph hep-th | null | The interferometry-based experimental tests of quantum properties of
space-time which the author sketched out in a recent short Letter [Nature 398
(1999) 216] are here discussed in self-contained fashion. Besides providing
detailed derivations of the results already announced in the previous Letter,
some new results ... | [
{
"created": "Sat, 20 Mar 1999 23:03:41 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Amelino-Camelia",
"Giovanni",
""
]
] | The interferometry-based experimental tests of quantum properties of space-time which the author sketched out in a recent short Letter [Nature 398 (1999) 216] are here discussed in self-contained fashion. Besides providing detailed derivations of the results already announced in the previous Letter, some new results ar... |
gr-qc/0602047 | Roman Konoplya | R. A. Konoplya, C. Molina, A. Zhidenko | Late time tails of the massive vector field in a black hole background | one author and new material are added | Phys.Rev.D75:084004,2007 | 10.1103/PhysRevD.75.084004 | null | gr-qc | null | We investigate the late-time behavior of the massive vector field in the
background of the Schwarzschild and Schwarzschild-de Sitter black holes. For
Schwarzschild black hole, at intermediately late times the massive vector field
is represented by three functions with different decay law $\Psi_{0} \sim
t^{-(\ell + 3/... | [
{
"created": "Mon, 13 Feb 2006 19:29:59 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Feb 2007 18:16:56 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Konoplya",
"R. A.",
""
],
[
"Molina",
"C.",
""
],
[
"Zhidenko",
"A.",
""
]
] | We investigate the late-time behavior of the massive vector field in the background of the Schwarzschild and Schwarzschild-de Sitter black holes. For Schwarzschild black hole, at intermediately late times the massive vector field is represented by three functions with different decay law $\Psi_{0} \sim t^{-(\ell + 3/2)... |
2203.09263 | Roberto Maluf | C. R, Muniz and R. V. Maluf | Generalized Ellis-Bronikov traversable wormholes in $f(R)$ gravity with
anisotropic dark matter | 15 pages, 10 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | This paper studies generalized Ellis-Bronikov (E-B) traversable wormholes in
$f(R)$ extended gravity. We assume that these wormholes are supported by
anisotropic dark matter (DM) according to the most often used phenomenological
models, namely those of Navarro-Frenk-White (NFW), Thomas-Fermi (T-F), and
Pseudo-isother... | [
{
"created": "Thu, 17 Mar 2022 11:32:39 GMT",
"version": "v1"
}
] | 2022-03-18 | [
[
"R",
"C.",
""
],
[
"Muniz",
"",
""
],
[
"Maluf",
"R. V.",
""
]
] | This paper studies generalized Ellis-Bronikov (E-B) traversable wormholes in $f(R)$ extended gravity. We assume that these wormholes are supported by anisotropic dark matter (DM) according to the most often used phenomenological models, namely those of Navarro-Frenk-White (NFW), Thomas-Fermi (T-F), and Pseudo-isotherma... |
1202.0174 | Alexander Kamenshchik | Alexander Y. Kamenshchik and Serena Manti | Classical and quantum Big Brake cosmology for scalar field and tachyonic
models | final version, to appear in Phys. Rev. D | null | 10.1103/PhysRevD.85.123518 | null | gr-qc astro-ph.CO hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a relation between the cosmological singularities in classical and
quantum theory, comparing the classical and quantum dynamics in some models
possessing the Big Brake singularity - the model based on a scalar field and
two models based on a tachyon-pseudo-tachyon field . It is shown that the
effect of quant... | [
{
"created": "Wed, 1 Feb 2012 13:56:36 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Jun 2012 11:34:30 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Kamenshchik",
"Alexander Y.",
""
],
[
"Manti",
"Serena",
""
]
] | We study a relation between the cosmological singularities in classical and quantum theory, comparing the classical and quantum dynamics in some models possessing the Big Brake singularity - the model based on a scalar field and two models based on a tachyon-pseudo-tachyon field . It is shown that the effect of quantum... |
1005.2976 | Massimo Bassan | Giuseppe Pucacco, Massimo Bassan and Massimo Visco | Autonomous perturbations of LISA orbits | 27pages, 20 figures - Accepted for publication on CQG | Class.Quant.Grav.27:235001,2010 | 10.1088/0264-9381/27/23/235001 | null | gr-qc nlin.CD | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate autonomous perturbations on the orbits of LISA, namely the
effects produced by fields that can be expressed only in terms of the position,
but not of time in the Hill frame. This first step in the study of the LISA
orbits has been the subject of recent papers which implement analytical
techniques based... | [
{
"created": "Mon, 17 May 2010 17:05:44 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Sep 2010 18:17:03 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Pucacco",
"Giuseppe",
""
],
[
"Bassan",
"Massimo",
""
],
[
"Visco",
"Massimo",
""
]
] | We investigate autonomous perturbations on the orbits of LISA, namely the effects produced by fields that can be expressed only in terms of the position, but not of time in the Hill frame. This first step in the study of the LISA orbits has been the subject of recent papers which implement analytical techniques based o... |
gr-qc/9711020 | Andreas Aste | G"unter Scharf | Microcanonical Quantum Statistics of Schwarzschild Black Holes | 3 pages, latex | Nuovo Cim. B113 (1998) 821-824 | null | ZU-TH-32/97 | gr-qc | null | It is shown that a quantized Schwarzschild black hole, if described by a
square root energy spectrum with exponential multiplicity, can be treated as a
microcanonical ensemble without problem leading to the expected thermodynamical
properties.
| [
{
"created": "Thu, 6 Nov 1997 13:56:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Scharf",
"G\"unter",
""
]
] | It is shown that a quantized Schwarzschild black hole, if described by a square root energy spectrum with exponential multiplicity, can be treated as a microcanonical ensemble without problem leading to the expected thermodynamical properties. |
1806.11020 | Prado Martin-Moruno | Jose A. R. Cembranos, Mario Coma Diaz, Prado Martin-Moruno | Graviton-photon oscillation in alternative theories of gravity | V1: 5 pages. V2: 9 pages (new style); clarifications in the
discussion included, no physics changes; 3 references added. V3: 10 pages, 4
references added, discussion extended. Version accepted for publication in
Classical and Quantum Gravity | null | 10.1088/1361-6382/aae1d9 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we investigate graviton-photon oscillation in the presence of
an external magnetic field in alternative theories of gravity. Whereas the
effect of an effective refractive index for the electromagnetic radiation was
already considered in the literature, we develop the first approach to take
into account ... | [
{
"created": "Thu, 28 Jun 2018 14:56:44 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Jul 2018 05:50:21 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Sep 2018 08:06:57 GMT",
"version": "v3"
}
] | 2018-09-20 | [
[
"Cembranos",
"Jose A. R.",
""
],
[
"Diaz",
"Mario Coma",
""
],
[
"Martin-Moruno",
"Prado",
""
]
] | In this paper we investigate graviton-photon oscillation in the presence of an external magnetic field in alternative theories of gravity. Whereas the effect of an effective refractive index for the electromagnetic radiation was already considered in the literature, we develop the first approach to take into account th... |
1806.02581 | Xing Zhang | Xing Zhang, Wen Zhao, Tan Liu, Kai Lin, Chao Zhang, Shaojun Zhang,
Xiang Zhao, Tao Zhu, Anzhong Wang | Evidence of deviations from general relativity in binary pulsars? | 5 pages, 3 figures, 2 tables | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Testing gravitational theories by binary pulsars nowadays becomes a key
issue. For the general screened modified gravity (SMG), the post-Keplerian
parameters in the neutron star (NS) - white dwarf (WD) binaries differ from
those of general relativity (GR), and the differences are quantified by the
scalar charge $\eps... | [
{
"created": "Thu, 7 Jun 2018 09:31:51 GMT",
"version": "v1"
}
] | 2018-06-08 | [
[
"Zhang",
"Xing",
""
],
[
"Zhao",
"Wen",
""
],
[
"Liu",
"Tan",
""
],
[
"Lin",
"Kai",
""
],
[
"Zhang",
"Chao",
""
],
[
"Zhang",
"Shaojun",
""
],
[
"Zhao",
"Xiang",
""
],
[
"Zhu",
"Tao",
""
]... | Testing gravitational theories by binary pulsars nowadays becomes a key issue. For the general screened modified gravity (SMG), the post-Keplerian parameters in the neutron star (NS) - white dwarf (WD) binaries differ from those of general relativity (GR), and the differences are quantified by the scalar charge $\epsil... |
1305.3779 | Sante Carloni Dr | Stefano Vignolo, Sante Carloni and Francesco Vietri | Reconstructing exact scalar-tensor cosmologies via conformal
transformations | 8 pages, 2 figures | Phys. Rev. D 88, 023006 (2013) | 10.1103/PhysRevD.88.023006 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new reconstruction method for scalar--tensor gravity based on
the use of conformal transformations. The new method allows the derivation of a
set of interesting exact cosmological solutions in brans Dicke gravity as well
as other extensions of General Relativity.
| [
{
"created": "Thu, 16 May 2013 12:27:47 GMT",
"version": "v1"
}
] | 2013-11-26 | [
[
"Vignolo",
"Stefano",
""
],
[
"Carloni",
"Sante",
""
],
[
"Vietri",
"Francesco",
""
]
] | We propose a new reconstruction method for scalar--tensor gravity based on the use of conformal transformations. The new method allows the derivation of a set of interesting exact cosmological solutions in brans Dicke gravity as well as other extensions of General Relativity. |
1511.06963 | Viktor G. Czinner | Viktor G. Czinner and Hideo Iguchi | R\'enyi entropy and the thermodynamic stability of black holes | 6 pages, 6 figures, accepted for publication in Phys. Lett. B | Phys. Lett. B 752 (2016) 306-310 | 10.1016/j.physletb.2015.11.061 | null | gr-qc cond-mat.stat-mech hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Thermodynamic stability of black holes, described by the R\'enyi formula as
equilibrium compatible entropy function, is investigated. It is shown that
within this approach, asymptotically flat, Schwarzschild black holes can be in
stable equilibrium with thermal radiation at a fixed temperature. This implies
that the ... | [
{
"created": "Sun, 22 Nov 2015 04:41:44 GMT",
"version": "v1"
}
] | 2015-12-09 | [
[
"Czinner",
"Viktor G.",
""
],
[
"Iguchi",
"Hideo",
""
]
] | Thermodynamic stability of black holes, described by the R\'enyi formula as equilibrium compatible entropy function, is investigated. It is shown that within this approach, asymptotically flat, Schwarzschild black holes can be in stable equilibrium with thermal radiation at a fixed temperature. This implies that the ca... |
gr-qc/0212093 | Antoine Folacci | Yves D\'ecanini, Antoine Folacci, Bruce Jensen | Complex angular momentum in black hole physics and quasinormal modes | 6 pages, 3 figures, revised version | Phys.Rev. D67 (2003) 124017 | 10.1103/PhysRevD.67.124017 | null | gr-qc astro-ph hep-th | null | By using the complex angular momentum approach, we prove that the quasinormal
mode complex frequencies of the Schwarzschild black hole are Breit-Wigner type
resonances generated by a family of surface waves propagating close to the
unstable circular photon (graviton) orbit at $r=3M$. Furthermore, because each
surface... | [
{
"created": "Mon, 23 Dec 2002 13:25:50 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Jun 2003 07:43:12 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Décanini",
"Yves",
""
],
[
"Folacci",
"Antoine",
""
],
[
"Jensen",
"Bruce",
""
]
] | By using the complex angular momentum approach, we prove that the quasinormal mode complex frequencies of the Schwarzschild black hole are Breit-Wigner type resonances generated by a family of surface waves propagating close to the unstable circular photon (graviton) orbit at $r=3M$. Furthermore, because each surface w... |
1004.2406 | Lorenzo Iorio | Lorenzo Iorio | Some Applications of Binary Pulsars to Fundamental Physics | LaTex2e, 21 pages, 1 table, no figures. Invited chapter, to appear
in: Pulsars: Theory, Categories and Applications, Editor: Alexander D.
Morozov, 2010, Nova Science Publishers, ISBN: 978-1-61668-919-3 | A.D. Morozov (ed.) Pulsars: Theory, Categories and Applications,
Nova Science, Hauppauge, 2010, pp. 73-93 | null | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Binary systems containing at least one radiopulsar are excellent laboratories
to test several aspects of fundamental physics like matter properties in
conditions of extreme density and theories of gravitation like the Einstein's
General Theory of Gravitation (GTR) along with modifications/extensions of it.
In this Ch... | [
{
"created": "Wed, 14 Apr 2010 14:30:41 GMT",
"version": "v1"
}
] | 2010-12-08 | [
[
"Iorio",
"Lorenzo",
""
]
] | Binary systems containing at least one radiopulsar are excellent laboratories to test several aspects of fundamental physics like matter properties in conditions of extreme density and theories of gravitation like the Einstein's General Theory of Gravitation (GTR) along with modifications/extensions of it. In this Chap... |
1705.05722 | Jorge Pullin | Rodrigo Eyheralde, Miguel Campiglia, Rodolfo Gambini and Jorge Pullin | Quantum fluctuating geometries and the information paradox | 25 pages, 3 figures, removed extra figure in previous version and
made small changes | null | 10.1088/1361-6382/aa8e30 | LSU-REL-051617 | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study Hawking radiation on the quantum space-time of a collapsing null
shell. We use the geometric optics approximation as in Hawking's original
papers to treat the radiation. The quantum space-time is constructed by
superposing the classical geometries associated with collapsing shells with
uncertainty in their p... | [
{
"created": "Tue, 16 May 2017 14:28:04 GMT",
"version": "v1"
},
{
"created": "Thu, 18 May 2017 14:01:23 GMT",
"version": "v2"
},
{
"created": "Mon, 29 May 2017 16:52:15 GMT",
"version": "v3"
},
{
"created": "Wed, 31 May 2017 15:27:50 GMT",
"version": "v4"
}
] | 2017-12-06 | [
[
"Eyheralde",
"Rodrigo",
""
],
[
"Campiglia",
"Miguel",
""
],
[
"Gambini",
"Rodolfo",
""
],
[
"Pullin",
"Jorge",
""
]
] | We study Hawking radiation on the quantum space-time of a collapsing null shell. We use the geometric optics approximation as in Hawking's original papers to treat the radiation. The quantum space-time is constructed by superposing the classical geometries associated with collapsing shells with uncertainty in their pos... |
2111.09694 | Hristu Culetu | Hristu Culetu | On a conformal Schwarzschild-de Sitter spacetime | 11 pages, no figures. Version published in GRG 53:103 (2021) | null | 10.1007/s10714-021-02876-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | On the basis of the C-metric, we investigate the conformal Schwarzschild -
deSitter spacetime and compute the source stress tensor and study its
properties, including the energy conditions. Then we study its extremal version
($b^{2} = 27m^{2}$, where $b$ is the deS radius and $m$ is the source mass),
when the metric ... | [
{
"created": "Tue, 16 Nov 2021 22:03:43 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Nov 2021 13:50:34 GMT",
"version": "v2"
}
] | 2021-11-24 | [
[
"Culetu",
"Hristu",
""
]
] | On the basis of the C-metric, we investigate the conformal Schwarzschild - deSitter spacetime and compute the source stress tensor and study its properties, including the energy conditions. Then we study its extremal version ($b^{2} = 27m^{2}$, where $b$ is the deS radius and $m$ is the source mass), when the metric is... |
gr-qc/0409087 | Franz Hinterleitner | Franz Hinterleitner | Canonical DSR | 11 pages | Phys.Rev.D71:025016,2005 | 10.1103/PhysRevD.71.025016 | null | gr-qc | null | For a certain example of a "doubly special relativity theory" the modified
space-time Lorentz transformations are obtained from momentum space
transformations by using canonical methods. In the sequel an energy-momentum
dependent space-time metric is constructed, which is essentially invariant
under the modified Lore... | [
{
"created": "Wed, 22 Sep 2004 12:49:18 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Oct 2004 13:44:42 GMT",
"version": "v2"
},
{
"created": "Thu, 2 Dec 2004 11:34:30 GMT",
"version": "v3"
},
{
"created": "Tue, 1 Feb 2005 11:34:03 GMT",
"version": "v4"
}
] | 2014-11-17 | [
[
"Hinterleitner",
"Franz",
""
]
] | For a certain example of a "doubly special relativity theory" the modified space-time Lorentz transformations are obtained from momentum space transformations by using canonical methods. In the sequel an energy-momentum dependent space-time metric is constructed, which is essentially invariant under the modified Lorent... |
1106.4132 | Mew-Bing Wan | Mew-Bing Wan | Universality and properties of neutron star type I critical collapses | 13 pages, 12 figures, 1 new reference added | Class. Quantum Grav. 28 (2011) 155002 | 10.1088/0264-9381/28/15/155002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the neutron star axisymmetric critical solution previously found in
the numerical studies of neutron star mergers. Using neutron star-like initial
data and performing similar merger simulations, we demonstrate that the
solution is indeed a semi-attractor on the threshold plane separating the basin
of a neutr... | [
{
"created": "Tue, 21 Jun 2011 08:35:54 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Sep 2011 07:33:17 GMT",
"version": "v2"
}
] | 2011-09-27 | [
[
"Wan",
"Mew-Bing",
""
]
] | We study the neutron star axisymmetric critical solution previously found in the numerical studies of neutron star mergers. Using neutron star-like initial data and performing similar merger simulations, we demonstrate that the solution is indeed a semi-attractor on the threshold plane separating the basin of a neutron... |
2404.05302 | Frederik Scholtz | L Horoto and F G Scholtz | A New Perspective on Kaluza-Klein Theories | null | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By assuming that the geometry of spacetime is uniquely determined by the
energy momentum tensor of matter alone, i.e. without any interactions, enables
us to construct the Lagrangian from which the metric of higher dimensional
spacetime follows. From the geodesic equations that follow it becomes clear
that the incorr... | [
{
"created": "Mon, 8 Apr 2024 08:46:37 GMT",
"version": "v1"
}
] | 2024-04-09 | [
[
"Horoto",
"L",
""
],
[
"Scholtz",
"F G",
""
]
] | By assuming that the geometry of spacetime is uniquely determined by the energy momentum tensor of matter alone, i.e. without any interactions, enables us to construct the Lagrangian from which the metric of higher dimensional spacetime follows. From the geodesic equations that follow it becomes clear that the incorrec... |
1605.04968 | Mu-Tao Wang | Mu-Tao Wang | Energy, momentum, and center of mass in general relativity | A paper based on the author's talk at the JDG 2014 conference on Sep
13-14, 2014. To be published in Surveys in Differential Geometry, Vol. 21
(2016) | null | null | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | These notions in the title are of fundamental importance in any branch of
physics. However, there have been great difficulties in finding physically
acceptable definitions of them in general relativity since Einstein's time. I
shall explain these difficulties and progresses that have been made. In
particular, I shall... | [
{
"created": "Mon, 16 May 2016 22:17:25 GMT",
"version": "v1"
}
] | 2016-05-18 | [
[
"Wang",
"Mu-Tao",
""
]
] | These notions in the title are of fundamental importance in any branch of physics. However, there have been great difficulties in finding physically acceptable definitions of them in general relativity since Einstein's time. I shall explain these difficulties and progresses that have been made. In particular, I shall i... |
gr-qc/9709073 | Beverly K. Berger | B.K. Berger, D. Garfinkle, V. Moncrief | Numerical Study of Cosmological Singularities | 20 pages, 5 epsf figures, Latex, uses psfig. Based on talk presented
at Workshop on Black Hole Interiors, Haifa, June 22 - July 3, 1997 | null | null | null | gr-qc | null | The spatially homogeneous, isotropic Standard Cosmological Model appears to
describe our Universe reasonably well. However, Einstein's equations allow a
much larger class of cosmological solutions. Theorems originally due to Penrose
and Hawking predict that all such models (assuming reasonable matter
properties) will... | [
{
"created": "Fri, 26 Sep 1997 20:03:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Berger",
"B. K.",
""
],
[
"Garfinkle",
"D.",
""
],
[
"Moncrief",
"V.",
""
]
] | The spatially homogeneous, isotropic Standard Cosmological Model appears to describe our Universe reasonably well. However, Einstein's equations allow a much larger class of cosmological solutions. Theorems originally due to Penrose and Hawking predict that all such models (assuming reasonable matter properties) will h... |
1401.3480 | Saneesh Sebastian | Saneesh Sebastian and V. C. Kuriakose | Scattering of Scalar Field by an Extended Black Hole in F(R) gravity | 9 page, no figures, To appear in MPLA | null | 10.1142/S0217732314500059 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we have studied the scattering of scalar field around an
extended black hole in F(R) gravity using WKB method. We have obtained the wave
function in different regions such as near the horizon region, away from
horizon and far away from horizon and the absorption cross section are
calculated. We find that... | [
{
"created": "Wed, 15 Jan 2014 05:34:29 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Sebastian",
"Saneesh",
""
],
[
"Kuriakose",
"V. C.",
""
]
] | In this work we have studied the scattering of scalar field around an extended black hole in F(R) gravity using WKB method. We have obtained the wave function in different regions such as near the horizon region, away from horizon and far away from horizon and the absorption cross section are calculated. We find that t... |
0912.1317 | Adellane Sousa | A. A. Sousa, D. M. Oliveira and R. B. Pereira | Space-time Torsion and Neutrino Oscillations in Vacuum | 07 pages, no figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The objective of this study is to verify the consistency of the prescription
of alternative minimum coupling (connection) proposed by the Teleparallel
Equivalent to General Relativity (TEGR) for the Dirac equation. With this aim,
we studied the problem of neutrino oscillations in Weitzenbock space-time in
the Schwarz... | [
{
"created": "Mon, 7 Dec 2009 19:31:08 GMT",
"version": "v1"
}
] | 2009-12-22 | [
[
"Sousa",
"A. A.",
""
],
[
"Oliveira",
"D. M.",
""
],
[
"Pereira",
"R. B.",
""
]
] | The objective of this study is to verify the consistency of the prescription of alternative minimum coupling (connection) proposed by the Teleparallel Equivalent to General Relativity (TEGR) for the Dirac equation. With this aim, we studied the problem of neutrino oscillations in Weitzenbock space-time in the Schwarzsc... |
1511.07775 | Angus Prain | Valerio Faraoni and Angus Prain | Understanding dynamical black hole apparent horizons | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dynamical, non-asymptotically flat black holes are best characterized by
their apparent horizons. Cosmological black hole solutions of General
Relativity exhibit two types of apparent horizon behaviours which, thus far,
appeared to be completely disconnected. By taking the limit to General
Relativity of a class of Br... | [
{
"created": "Tue, 24 Nov 2015 16:09:11 GMT",
"version": "v1"
}
] | 2015-11-25 | [
[
"Faraoni",
"Valerio",
""
],
[
"Prain",
"Angus",
""
]
] | Dynamical, non-asymptotically flat black holes are best characterized by their apparent horizons. Cosmological black hole solutions of General Relativity exhibit two types of apparent horizon behaviours which, thus far, appeared to be completely disconnected. By taking the limit to General Relativity of a class of Bran... |
2010.13730 | Stefano Foffa | Stefano Foffa, Riccardo Sturani, William J. Torres Bobadilla | Efficient resummation of high post-Newtonian contributions to the
binding energy | 17 pages, 3 figures. In v3: Section 2 expanded. Published on JHEP | null | 10.1007/JHEP02(2021)165 | IFIC/20-45; MPP-2020-191 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A factorisation property of Feynman diagrams in the context the Effective
Field Theory approach to the compact binary problem has been recently employed
to efficiently determine the static sector of the potential at fifth
post-Newtonian (5PN) order. We extend this procedure to the case of non-static
diagrams and we u... | [
{
"created": "Mon, 26 Oct 2020 17:14:49 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Nov 2020 14:17:59 GMT",
"version": "v2"
},
{
"created": "Fri, 19 Feb 2021 16:06:45 GMT",
"version": "v3"
}
] | 2021-03-17 | [
[
"Foffa",
"Stefano",
""
],
[
"Sturani",
"Riccardo",
""
],
[
"Bobadilla",
"William J. Torres",
""
]
] | A factorisation property of Feynman diagrams in the context the Effective Field Theory approach to the compact binary problem has been recently employed to efficiently determine the static sector of the potential at fifth post-Newtonian (5PN) order. We extend this procedure to the case of non-static diagrams and we use... |
gr-qc/0109059 | Christodoulakis Theodosios | T. Christodoulakis | Lectures on Quantum Cosmology | 34 pages, LaTeX2e, No figures | Lect.Notes Phys.592:318-350,2002 | null | null | gr-qc | null | The problems encountered in trying to quantize the various cosmological
models, are brought forward by means of a concrete example. The Automorphism
groups are revealed as the key element through which G.C.T.'s can be used for a
general treatment of these problems. At the classical level, the time dependent
automorph... | [
{
"created": "Tue, 18 Sep 2001 09:39:16 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Christodoulakis",
"T.",
""
]
] | The problems encountered in trying to quantize the various cosmological models, are brought forward by means of a concrete example. The Automorphism groups are revealed as the key element through which G.C.T.'s can be used for a general treatment of these problems. At the classical level, the time dependent automorphis... |
2404.10309 | Saheb Soroushfar | Saheb Soroushfar, Hoda Farahani, and Sudhaker Upadhyay | Non-perturbative correction to thermodynamics of conformally dressed 3D
black hole | 13 pages, 5 figures | Physics of the Dark Universe 42 (2023) 101272 | 10.1016/j.dark.2023.101272 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We extend the study of corrected thermodynamics for the 3D black holes
conformally coupled to scalar field up to non-perturbative level. We calculate
the exponential correction to entropy arises due to the microstate counting for
quantum states on the boundary. This exponential correction in entropy
attributes to the... | [
{
"created": "Tue, 16 Apr 2024 06:34:49 GMT",
"version": "v1"
}
] | 2024-04-17 | [
[
"Soroushfar",
"Saheb",
""
],
[
"Farahani",
"Hoda",
""
],
[
"Upadhyay",
"Sudhaker",
""
]
] | We extend the study of corrected thermodynamics for the 3D black holes conformally coupled to scalar field up to non-perturbative level. We calculate the exponential correction to entropy arises due to the microstate counting for quantum states on the boundary. This exponential correction in entropy attributes to the o... |
2301.00682 | Hossein Ghaffarnejad | Hossein Ghaffarnejad, Tohid Ghorbani and Firoozeh Eidizadeh | On the stability of electrostatics stars with modified non-gauge
invariant Einstein-Maxwell gravity | 23 pages, 2 figure | General Relativity and Gravitation 2023 | 10.1007/s10714-023-03183-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use a modified Einstein-Maxwell gravity to study stability of an
electrostatic spherical star. Correction terms in this model are scalers which
are made from contraction of Ricci tensor and electromagnetic vector potential.
Our motivation to use this kind of exotic EM gravity is inevitable influence of
cosmic magn... | [
{
"created": "Tue, 27 Dec 2022 21:18:23 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Aug 2023 22:10:39 GMT",
"version": "v2"
}
] | 2023-12-05 | [
[
"Ghaffarnejad",
"Hossein",
""
],
[
"Ghorbani",
"Tohid",
""
],
[
"Eidizadeh",
"Firoozeh",
""
]
] | We use a modified Einstein-Maxwell gravity to study stability of an electrostatic spherical star. Correction terms in this model are scalers which are made from contraction of Ricci tensor and electromagnetic vector potential. Our motivation to use this kind of exotic EM gravity is inevitable influence of cosmic magnet... |
1108.5086 | Gil Jannes | G. Jannes and G. E. Volovik | The cosmological constant: A lesson from the effective gravity of
topological Weyl media | 7 pages, no figures | JETP Lett.96:215-221, 2012 (Pisma Zh.Eksp.Teor.Fiz.96:231-237,
2012) | 10.1134/S0021364012160035 | null | gr-qc cond-mat.other hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Topological matter with Weyl points, such as superfluid 3He-A, provide an
explicit example where there is a direct connection between the properly
determined vacuum energy and the cosmological constant of the effective gravity
emerging in condensed matter. This is in contrast to the acoustic gravity
emerging in Bose-... | [
{
"created": "Thu, 25 Aug 2011 13:40:50 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Aug 2011 16:14:37 GMT",
"version": "v2"
},
{
"created": "Mon, 28 Nov 2011 10:19:35 GMT",
"version": "v3"
},
{
"created": "Mon, 19 Dec 2011 10:47:10 GMT",
"version": "v4"
},
{
"c... | 2013-02-18 | [
[
"Jannes",
"G.",
""
],
[
"Volovik",
"G. E.",
""
]
] | Topological matter with Weyl points, such as superfluid 3He-A, provide an explicit example where there is a direct connection between the properly determined vacuum energy and the cosmological constant of the effective gravity emerging in condensed matter. This is in contrast to the acoustic gravity emerging in Bose-Ei... |
2306.10467 | Xiao-Mei Kuang | Meng-He Wu, Hong Guo, Xiao-Mei Kuang | Precession and Lense-Thirring effect of hairy Kerr spacetimes | 18 pages,12 figures, published on 17 March 2023 | PHYS. REV. D 107, 064033 (2023) | 10.1103/PhysRevD.107.064033 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We investigate the frame-dragging effect of the hairy Kerr spacetimes on the
spin of a test gyro and accretion disk. Firstly, we analyze Lense-Thirring (LT)
precession frequency, geodetic precession frequency, and the general spin
precession frequency of a test gyro attached to a stationary observer in the
spacetime.... | [
{
"created": "Sun, 18 Jun 2023 03:34:24 GMT",
"version": "v1"
}
] | 2023-06-21 | [
[
"Wu",
"Meng-He",
""
],
[
"Guo",
"Hong",
""
],
[
"Kuang",
"Xiao-Mei",
""
]
] | We investigate the frame-dragging effect of the hairy Kerr spacetimes on the spin of a test gyro and accretion disk. Firstly, we analyze Lense-Thirring (LT) precession frequency, geodetic precession frequency, and the general spin precession frequency of a test gyro attached to a stationary observer in the spacetime. W... |
2210.10383 | Bahtiyar \"Ozg\"ur Sar{\i}o\u{g}lu | Ulf Lindstr\"om and \"Ozg\"ur Sar{\i}o\u{g}lu | Gravitational duality, Palatini variation and boundary terms: A synopsis | 15 pages, one figure; Ver. 2: 16 pages, one figure, various
clarifying remarks added, accepted for publication in CQG | Class. Quantum Grav. 40 (2023) 085003 | 10.1088/1361-6382/acc22f | Theoretical Physics Uppsala University preprint UUITP-43/22 | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider $f(R)$ gravity and Born-Infeld-Einstein (BIE) gravity in
formulations where the metric and connection are treated independently and
integrate out the metric to find the corresponding models solely in terms of
the connection, the archetypical treatment being that of
Eddington-Schr\"odinger (ES) duality bet... | [
{
"created": "Wed, 19 Oct 2022 08:51:57 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Mar 2023 11:36:29 GMT",
"version": "v2"
}
] | 2023-03-20 | [
[
"Lindström",
"Ulf",
""
],
[
"Sarıoğlu",
"Özgür",
""
]
] | We consider $f(R)$ gravity and Born-Infeld-Einstein (BIE) gravity in formulations where the metric and connection are treated independently and integrate out the metric to find the corresponding models solely in terms of the connection, the archetypical treatment being that of Eddington-Schr\"odinger (ES) duality betwe... |
2406.09526 | Diego S\'aez-Chill\'on G\'omez | Gerardo Mora-P\'erez, Gonzalo J. Olmo, Diego Rubiera-Garcia and Diego
S\'aez-Chill\'on G\'omez | Boundary terms and on-shell action in Ricci-based gravity theories: the
Hamiltonian formulation | 10 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Considering the so-called Ricci-based gravity theories, a family of
extensions of General Relativity whose action is given by a non-linear function
of contractions and products of the (symmetric part of the) Ricci tensor of an
independent connection, the Hamiltonian formulation of the theory is obtained.
To do so, th... | [
{
"created": "Thu, 13 Jun 2024 18:31:14 GMT",
"version": "v1"
}
] | 2024-06-17 | [
[
"Mora-Pérez",
"Gerardo",
""
],
[
"Olmo",
"Gonzalo J.",
""
],
[
"Rubiera-Garcia",
"Diego",
""
],
[
"Gómez",
"Diego Sáez-Chillón",
""
]
] | Considering the so-called Ricci-based gravity theories, a family of extensions of General Relativity whose action is given by a non-linear function of contractions and products of the (symmetric part of the) Ricci tensor of an independent connection, the Hamiltonian formulation of the theory is obtained. To do so, the ... |
2004.11266 | Ayan Chatterjee | Ayan Chatterjee, Amit Ghosh and Suresh Jaryal | Marginally Trapped Surfaces in Spherical Gravitational Collapse | 50 pages, 16 figures, typos corrected, references added | Phys. Rev. D 102, 064048 (2020) | 10.1103/PhysRevD.102.064048 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper deals with a detail study of gravitational collapse of dust and
viscous fluids under the assumptions of spherical symmetry. Our main goal is to
closely analyze the horizons which arise during this gravitational phenomenon.
To this end, we examine the formation and evolution of trapped surfaces in
these spa... | [
{
"created": "Thu, 23 Apr 2020 15:51:56 GMT",
"version": "v1"
},
{
"created": "Tue, 12 May 2020 15:31:31 GMT",
"version": "v2"
}
] | 2020-09-23 | [
[
"Chatterjee",
"Ayan",
""
],
[
"Ghosh",
"Amit",
""
],
[
"Jaryal",
"Suresh",
""
]
] | This paper deals with a detail study of gravitational collapse of dust and viscous fluids under the assumptions of spherical symmetry. Our main goal is to closely analyze the horizons which arise during this gravitational phenomenon. To this end, we examine the formation and evolution of trapped surfaces in these space... |
1411.7553 | Francesco Caravelli | Leonardo Banchi, Francesco Caravelli | Geometric phases and cyclic isotropic cosmologies | 13 pages, 10 figures; new LQC analysis and citations added, text
improved, typos corrected | Classical and Quantum Gravity 10, Vol 33 (2016) | 10.1088/0264-9381/33/10/105003 | null | gr-qc cond-mat.other hep-th quant-ph | http://creativecommons.org/licenses/by-nc-sa/4.0/ | In the present paper we study the evolution of the modes of a scalar field in
a cyclic cosmology. In order to keep the discussion clear, we study the
features of a scalar field in a toy model, a Friedman-Robertson-Walker universe
with a periodic scale factor, in which the universe expands, contracts and
bounces infin... | [
{
"created": "Thu, 27 Nov 2014 11:23:03 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Dec 2014 10:01:43 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Dec 2014 15:36:27 GMT",
"version": "v3"
},
{
"created": "Mon, 27 Apr 2015 10:13:09 GMT",
"version": "v4"
},
{
"cr... | 2017-03-15 | [
[
"Banchi",
"Leonardo",
""
],
[
"Caravelli",
"Francesco",
""
]
] | In the present paper we study the evolution of the modes of a scalar field in a cyclic cosmology. In order to keep the discussion clear, we study the features of a scalar field in a toy model, a Friedman-Robertson-Walker universe with a periodic scale factor, in which the universe expands, contracts and bounces infinit... |
2102.08222 | Milko Estrada | Milko Estrada | A new exact solution of black-strings-like with a dS core | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We provide a new five dimensional black string--like solution by means of the
embedding of a four dimensional regular black hole into a compact extra
dimension. We enunciate a list of constraints in order to that the five
dimensional black string--like solution to be regular, and, following these
constraints we const... | [
{
"created": "Tue, 16 Feb 2021 15:34:58 GMT",
"version": "v1"
}
] | 2021-02-17 | [
[
"Estrada",
"Milko",
""
]
] | We provide a new five dimensional black string--like solution by means of the embedding of a four dimensional regular black hole into a compact extra dimension. We enunciate a list of constraints in order to that the five dimensional black string--like solution to be regular, and, following these constraints we constru... |
gr-qc/0111015 | George Japaridze | W.D.Flanders, G.S.Japaridze | On a description of Gravitational Interaction between moving objects in
terms of Spatial Gravitational Fields | Will appear in International Journal of Theoretical Physics | Int.J.Theor.Phys.39:89,2001 | null | null | gr-qc physics.class-ph | null | Analyzing two simple experimental situations we show that from Newton's law
of gravitation and Special Relativity it follows that the motion of particle in
an external gravitational field can be described in terms of effective spatial
fields which satisfy Maxwell-like system of equations and propagate with the
speed ... | [
{
"created": "Tue, 6 Nov 2001 16:20:45 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Flanders",
"W. D.",
""
],
[
"Japaridze",
"G. S.",
""
]
] | Analyzing two simple experimental situations we show that from Newton's law of gravitation and Special Relativity it follows that the motion of particle in an external gravitational field can be described in terms of effective spatial fields which satisfy Maxwell-like system of equations and propagate with the speed of... |
gr-qc/0110014 | Piotr Chrusciel | Piotr T. Chrusciel, Gabriel Nagy | The mass of spacelike hypersurfaces in asymptotically anti-de Sitter
space-times | 49 pages, Latex2e with several style files; minor misprints corrected
here and there | Adv.Theor.Math.Phys. 5 (2002) 697-754 | null | null | gr-qc | null | We give a Hamiltonian definition of mass for spacelike hypersurfaces in
space-times with metrics which are asymptotic to the anti-de Sitter one, or to
a class of generalizations thereof. We show that our definition provides a
geometric invariant for a spacelike hypersurface embedded in a space-time.
| [
{
"created": "Tue, 2 Oct 2001 19:21:07 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Jan 2002 22:05:05 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Chrusciel",
"Piotr T.",
""
],
[
"Nagy",
"Gabriel",
""
]
] | We give a Hamiltonian definition of mass for spacelike hypersurfaces in space-times with metrics which are asymptotic to the anti-de Sitter one, or to a class of generalizations thereof. We show that our definition provides a geometric invariant for a spacelike hypersurface embedded in a space-time. |
0905.1670 | Benjamin Bahr | Benjamin Bahr, Bianca Dittrich | (Broken) Gauge Symmetries and Constraints in Regge Calculus | 32 pages, 15 figures | Class.Quant.Grav.26:225011,2009 | 10.1088/0264-9381/26/22/225011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We will examine the issue of diffeomorphism symmetry in simplicial models of
(quantum) gravity, in particular for Regge calculus. We find that for a
solution with curvature there do not exist exact gauge symmetries on the
discrete level. Furthermore we derive a canonical formulation that exactly
matches the dynamics ... | [
{
"created": "Mon, 11 May 2009 18:37:32 GMT",
"version": "v1"
}
] | 2009-12-15 | [
[
"Bahr",
"Benjamin",
""
],
[
"Dittrich",
"Bianca",
""
]
] | We will examine the issue of diffeomorphism symmetry in simplicial models of (quantum) gravity, in particular for Regge calculus. We find that for a solution with curvature there do not exist exact gauge symmetries on the discrete level. Furthermore we derive a canonical formulation that exactly matches the dynamics an... |
1909.01799 | Behnam Pourhassan | M. Rostami, J. Sadeghi, S. Miraboutalebi, B. Pourhassan and A. A.
Masoudi | Phase transition of modified Horndeski gravity with new method | 18 pages, 8 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the critical points of the $ P-V $ diagram and
the phase transitions of the Horndenski black holes. In fact, the usual
Horndeski black holes do not have $ P-V $ critical points, hence do not show
any phase transitions. However, we successfully modify the Horndeski black hole
solution to ... | [
{
"created": "Mon, 2 Sep 2019 18:53:39 GMT",
"version": "v1"
}
] | 2019-09-05 | [
[
"Rostami",
"M.",
""
],
[
"Sadeghi",
"J.",
""
],
[
"Miraboutalebi",
"S.",
""
],
[
"Pourhassan",
"B.",
""
],
[
"Masoudi",
"A. A.",
""
]
] | In this paper, we investigate the critical points of the $ P-V $ diagram and the phase transitions of the Horndenski black holes. In fact, the usual Horndeski black holes do not have $ P-V $ critical points, hence do not show any phase transitions. However, we successfully modify the Horndeski black hole solution to ob... |
1501.02671 | Sean Gryb B | Sean Gryb | Is Spacetime Countable? | 13 pages, 7 figures. Illustrations by Marc Ngui. To appear in
Foundations of Physics Frontiers Collections: It From Bit or Bit From It?
Winner of 4th prize in FQXi Essay contest | It From Bit or Bit From It? The Frontiers Collection. pp 153-168.
Springer, 2015 | 10.1007/978-3-319-12946-4_14 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Is there a number for every bit of spacetime, or is spacetime smooth like the
real line? The ultimate fate of a quantum theory of gravity might depend on it.
The troublesome infinities of quantum gravity can be cured by assuming that
spacetime comes in countable, discrete pieces which one could simulate on a
computer... | [
{
"created": "Mon, 12 Jan 2015 14:49:06 GMT",
"version": "v1"
}
] | 2018-01-18 | [
[
"Gryb",
"Sean",
""
]
] | Is there a number for every bit of spacetime, or is spacetime smooth like the real line? The ultimate fate of a quantum theory of gravity might depend on it. The troublesome infinities of quantum gravity can be cured by assuming that spacetime comes in countable, discrete pieces which one could simulate on a computer. ... |
gr-qc/9312009 | null | J.G. Russo | On black hole singularities in quantum gravity | 8 pages, 3 figures (included), UTTG-32-93 | Phys.Lett. B339 (1994) 35-40 | 10.1016/0370-2693(94)91129-0 | null | gr-qc hep-th | null | We show that absence of space-like boundaries in 1+1 dimensional dilaton
gravity implies a catastrophic event at the end point of black hole
evaporation. The proof is completely independent of the physics at Planck
scales, which suggests that the same will occur in any theory of quantum
gravity which only admits triv... | [
{
"created": "Fri, 3 Dec 1993 17:04:36 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Russo",
"J. G.",
""
]
] | We show that absence of space-like boundaries in 1+1 dimensional dilaton gravity implies a catastrophic event at the end point of black hole evaporation. The proof is completely independent of the physics at Planck scales, which suggests that the same will occur in any theory of quantum gravity which only admits trivia... |
2201.02220 | Leah Jenks | Stephon Alexander, Gregory Gabadadze, Leah Jenks, Nicol\'as Yunes | Black Hole Superradiance in Dynamical Chern-Simons Gravity | Error in Eq. 51-53 and 69-71 corrected, updated discussion | null | 10.1103/PhysRevD.107.084016 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black hole superradiance provides a window into the dynamics of light scalar
fields and their interactions close to a rotating black hole. Due to the
rotation of the black hole, the amplitude of the scalar field becomes
magnified, leading to a "black hole bomb" effect. Recent work has demonstrated
that rotating black... | [
{
"created": "Thu, 6 Jan 2022 19:25:20 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Jan 2023 17:28:27 GMT",
"version": "v2"
}
] | 2023-04-19 | [
[
"Alexander",
"Stephon",
""
],
[
"Gabadadze",
"Gregory",
""
],
[
"Jenks",
"Leah",
""
],
[
"Yunes",
"Nicolás",
""
]
] | Black hole superradiance provides a window into the dynamics of light scalar fields and their interactions close to a rotating black hole. Due to the rotation of the black hole, the amplitude of the scalar field becomes magnified, leading to a "black hole bomb" effect. Recent work has demonstrated that rotating black h... |
gr-qc/9412005 | Laszlo E. Szabo | Laszlo E. Szabo | Is Quantum Mechanics Compatible with a Deterministic Universe? Two
Interpretations of Quantum Probabilities | REVISED VERSION! ONLY SMALL CHANGES IN THE TEXT! compressed and
uuencoded postscript, a uuencoded version of a demo program file (epr.exe for
DOS) is attached as a "Figure" | null | 10.1007/BF02186578 | null | gr-qc quant-ph | null | Two problems will be considered: the question of hidden parameters and the
problem of Kolmogorovity of quantum probabilities. Both of them will be
analyzed from the point of view of two distinct understandings of quantum
mechanical probabilities. Our analysis will be focused, as a particular
example, on the Aspect-ty... | [
{
"created": "Thu, 1 Dec 1994 19:05:33 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Dec 1994 11:40:29 GMT",
"version": "v2"
},
{
"created": "Thu, 13 Apr 1995 14:44:45 GMT",
"version": "v3"
}
] | 2009-10-22 | [
[
"Szabo",
"Laszlo E.",
""
]
] | Two problems will be considered: the question of hidden parameters and the problem of Kolmogorovity of quantum probabilities. Both of them will be analyzed from the point of view of two distinct understandings of quantum mechanical probabilities. Our analysis will be focused, as a particular example, on the Aspect-type... |
2103.14313 | Yuichi Miyashita | Luca Buoninfante, Yuichi Miyashita | Gravitational field of scalar lumps in higher-derivative gravity | 21 pages, 6 figures. V2: version accepted for publication in PRD | Phys. Rev. D 103, 124068 (2021) | 10.1103/PhysRevD.103.124068 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | We study the gravitational field sourced by localized scalar fields (lumps)
in higher-derivative theories of gravity. By working in a static and
spherically symmetric configuration, we find the linearized spacetime metrics
generated by scalar lumps for several Lagrangians: the vanishing potential,
i.e. free massive s... | [
{
"created": "Fri, 26 Mar 2021 08:01:35 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Jun 2021 09:37:25 GMT",
"version": "v2"
}
] | 2021-07-07 | [
[
"Buoninfante",
"Luca",
""
],
[
"Miyashita",
"Yuichi",
""
]
] | We study the gravitational field sourced by localized scalar fields (lumps) in higher-derivative theories of gravity. By working in a static and spherically symmetric configuration, we find the linearized spacetime metrics generated by scalar lumps for several Lagrangians: the vanishing potential, i.e. free massive sca... |
gr-qc/0209079 | Bahram Mashhoon | Bahram Mashhoon | Modification of the Doppler Effect due to the Helicity-Rotation Coupling | LaTeX file, no figures, 15 pages, amended version | Phys.Lett. A306 (2002) 66-72 | 10.1016/S0375-9601(02)01537-2 | null | gr-qc astro-ph physics.optics | null | The helicity-rotation coupling and its current empirical basis are examined.
The modification of the Doppler effect due to the coupling of photon spin with
the rotation of the observer is considered in detail in connection with its
applications in the Doppler tracking of spacecraft. Further implications of
this coupl... | [
{
"created": "Sun, 22 Sep 2002 23:20:14 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Oct 2002 03:24:12 GMT",
"version": "v2"
}
] | 2010-04-05 | [
[
"Mashhoon",
"Bahram",
""
]
] | The helicity-rotation coupling and its current empirical basis are examined. The modification of the Doppler effect due to the coupling of photon spin with the rotation of the observer is considered in detail in connection with its applications in the Doppler tracking of spacecraft. Further implications of this couplin... |
1007.0953 | Volker Perlick | Volker Perlick and Anthony Carr | On the initial-value problem of the Maxwell-Lorentz equations | 13 pages, 3 figures. One reference added. To appear in J. Phys. A | J.Phys.A43:445502,2010 | 10.1088/1751-8113/43/44/445502 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the Maxwell-Lorentz equations, i.e., the equation of motion of a
charged dust coupled to Maxwell's equations, on an arbitrary
general-relativistic spacetime. We decompose this system of equations into
evolution equations and constraints, and we demonstrate that the evolution
equations are strongly hyperbo... | [
{
"created": "Tue, 6 Jul 2010 16:54:41 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Oct 2010 00:18:25 GMT",
"version": "v2"
}
] | 2011-04-08 | [
[
"Perlick",
"Volker",
""
],
[
"Carr",
"Anthony",
""
]
] | We consider the Maxwell-Lorentz equations, i.e., the equation of motion of a charged dust coupled to Maxwell's equations, on an arbitrary general-relativistic spacetime. We decompose this system of equations into evolution equations and constraints, and we demonstrate that the evolution equations are strongly hyperboli... |
2302.09062 | Rikpratik Sengupta | Rikpratik Sengupta, B. C. Paul, M. Kalam, P. Paul and A. Aich | Non-singular flat universes in braneworld and Loop Quantum Cosmology | 23 Pages, 12 Figs | Eur.Phys.J.Plus (2023) 138:929 | 10.1140/epjp/s13360-023-04541-w | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper we take matter source with non-linear Equation of state (EoS)
that has produced non-singular Emergent cosmology for spatially flat universe
in General Relativity and minimally coupled scalar field with two different
potentials that produce an inflationary emergent universe for positive spatial
curvature... | [
{
"created": "Fri, 17 Feb 2023 18:57:28 GMT",
"version": "v1"
}
] | 2023-10-23 | [
[
"Sengupta",
"Rikpratik",
""
],
[
"Paul",
"B. C.",
""
],
[
"Kalam",
"M.",
""
],
[
"Paul",
"P.",
""
],
[
"Aich",
"A.",
""
]
] | In this paper we take matter source with non-linear Equation of state (EoS) that has produced non-singular Emergent cosmology for spatially flat universe in General Relativity and minimally coupled scalar field with two different potentials that produce an inflationary emergent universe for positive spatial curvature i... |
gr-qc/0408036 | Deborah A. Konkowski | D.A. Konkowski, T.M. Helliwell, and C. Wieland | Quantum Singularities | 5 pages, no figures, references current | Gravitation and Cosmology: Proceedings of the Spanish Relativity
Meeting 2002, ed. A. Lobo (Barcelona, Spain: University of Barcelona Press,
2003) 193 | null | null | gr-qc | null | The definitions of classical and quantum singularities in general relativity
are reviewed. The occurence of quantum mechanical singularities in certain
spherically symmetric and cylindrically symmetric (including infinite line
mass)spacetimes is considered. A strong repulsive ``potential'' near the
classical singular... | [
{
"created": "Thu, 12 Aug 2004 14:43:24 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Konkowski",
"D. A.",
""
],
[
"Helliwell",
"T. M.",
""
],
[
"Wieland",
"C.",
""
]
] | The definitions of classical and quantum singularities in general relativity are reviewed. The occurence of quantum mechanical singularities in certain spherically symmetric and cylindrically symmetric (including infinite line mass)spacetimes is considered. A strong repulsive ``potential'' near the classical singularit... |
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