id stringlengths 9 13 | submitter stringlengths 1 64 ⌀ | authors stringlengths 5 22.9k | title stringlengths 4 245 | comments stringlengths 1 548 ⌀ | journal-ref stringlengths 4 362 ⌀ | doi stringlengths 12 82 ⌀ | report-no stringlengths 2 281 ⌀ | categories stringclasses 793
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1210.2805 | Puxun Wu | Jun Chen, Puxun Wu, Hongwei Yu, and Zhengxiang Li | Is the Cosmic Transparency Spatially Homogeneous? | 10 pages, 1 figure. Accepted for publication in JCAP on Sept. 26 | null | 10.1088/1475-7516/2012/10/029 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the constraints on the cosmic opacity using the latest BAO and
Union2 SNIa data in this paper and find that the best fit values seem to
indicate that an opaque universe is preferred in redshift regions $0.20-0.35$,
$0.35-0.44$ and $0.60-0.73$, whereas, a transparent universe is favored in
redshift regions $0... | [
{
"created": "Wed, 10 Oct 2012 05:08:31 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Chen",
"Jun",
""
],
[
"Wu",
"Puxun",
""
],
[
"Yu",
"Hongwei",
""
],
[
"Li",
"Zhengxiang",
""
]
] | We study the constraints on the cosmic opacity using the latest BAO and Union2 SNIa data in this paper and find that the best fit values seem to indicate that an opaque universe is preferred in redshift regions $0.20-0.35$, $0.35-0.44$ and $0.60-0.73$, whereas, a transparent universe is favored in redshift regions $0.1... |
2403.15355 | Xian Gao | Zhi-Chao Wang, Xian Gao | Spatial covariant gravity with two degrees of freedom in the presence of
an auxiliary scalar field: perturbation analysis | 17 pages, no figure | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We investigate a class of gravity theories respecting only spatial
covariance, termed spatially covariant gravity, in the presence of an auxiliary
scalar field. We examine the conditions on the Lagrangian required to eliminate
scalar degrees of freedom, allowing only two tensorial degrees of freedom to
propagate. Ins... | [
{
"created": "Fri, 22 Mar 2024 17:10:00 GMT",
"version": "v1"
}
] | 2024-03-25 | [
[
"Wang",
"Zhi-Chao",
""
],
[
"Gao",
"Xian",
""
]
] | We investigate a class of gravity theories respecting only spatial covariance, termed spatially covariant gravity, in the presence of an auxiliary scalar field. We examine the conditions on the Lagrangian required to eliminate scalar degrees of freedom, allowing only two tensorial degrees of freedom to propagate. Inste... |
1406.0358 | Manuel Tessmer | Manuel Tessmer and Gerhard Sch\"afer | Eccentric Motion of Spinning Compact Binaries | 15 pages, 1 figure | Phys. Rev. D 89, 104055 (2014) | 10.1103/PhysRevD.89.104055 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The equations of motion for spinning compact binaries on eccentric orbits are
treated perturbatively in powers of a fractional mass-difference ordering
parameter. The solution is valid through first order in the mass-difference
parameter. A canonical point transformation removes the leading order terms of
the spin-or... | [
{
"created": "Mon, 2 Jun 2014 13:21:04 GMT",
"version": "v1"
}
] | 2014-06-03 | [
[
"Tessmer",
"Manuel",
""
],
[
"Schäfer",
"Gerhard",
""
]
] | The equations of motion for spinning compact binaries on eccentric orbits are treated perturbatively in powers of a fractional mass-difference ordering parameter. The solution is valid through first order in the mass-difference parameter. A canonical point transformation removes the leading order terms of the spin-orbi... |
2102.06213 | Ivica Smoli\'c | Ana Bokuli\'c, Tajron Juri\'c, Ivica Smoli\'c | Black hole thermodynamics in the presence of nonlinear electromagnetic
fields | 20 pages (two columns), 2 figures; ver.3: version accepted for
publication in Physical Review D (several additional technical comments and
references; one paragraph added to the "Discussion") | Phys. Rev. D 103, 124059 (2021) | 10.1103/PhysRevD.103.124059 | ZTF-EP-21-02; RBI-ThPhys-2021-6 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As the interaction between the black holes and highly energetic infalling
charged matter receives quantum corrections, the basic laws of black hole
mechanics have to be carefully rederived. Using the covariant phase space
formalism, we generalize the first law of black hole mechanics, both
"equilibrium state" and "ph... | [
{
"created": "Thu, 11 Feb 2021 19:00:03 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Mar 2021 20:00:28 GMT",
"version": "v2"
},
{
"created": "Fri, 25 Jun 2021 19:45:10 GMT",
"version": "v3"
}
] | 2021-06-29 | [
[
"Bokulić",
"Ana",
""
],
[
"Jurić",
"Tajron",
""
],
[
"Smolić",
"Ivica",
""
]
] | As the interaction between the black holes and highly energetic infalling charged matter receives quantum corrections, the basic laws of black hole mechanics have to be carefully rederived. Using the covariant phase space formalism, we generalize the first law of black hole mechanics, both "equilibrium state" and "phys... |
2302.05173 | Stavros Venikoudis | F.P. Fronimos (Aristotle U., Thessaloniki), S.A. Venikoudis (Aristotle
U., Thessaloniki) | Inflationary phenomenology of non-minimally coupled
Einstein-Chern-Simons gravity | null | null | null | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | In this work we investigate the inflationary era in the presence of a
canonical scalar field and Chern-Simons parity violating corrections. It was
also assumed that a non minimal coupling between curvature and the scalar field
is present. For the shake of completeness, the slow-roll and the constant-roll
scenarios we... | [
{
"created": "Fri, 10 Feb 2023 11:08:17 GMT",
"version": "v1"
}
] | 2023-02-13 | [
[
"Fronimos",
"F. P.",
"",
"Aristotle U., Thessaloniki"
],
[
"Venikoudis",
"S. A.",
"",
"Aristotle\n U., Thessaloniki"
]
] | In this work we investigate the inflationary era in the presence of a canonical scalar field and Chern-Simons parity violating corrections. It was also assumed that a non minimal coupling between curvature and the scalar field is present. For the shake of completeness, the slow-roll and the constant-roll scenarios were... |
1909.04411 | Tapobrata Sarkar | Sandip Chowdhury, Kunal Pal, Kuntal Pal, Tapobrata Sarkar | Collapse in $f(R)$ gravity and the method of $R$ matching | 19 Pages, 18 figures | null | 10.1140/epjc/s10052-020-08459-w | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Collapsing solutions in $f(R)$ gravity are restricted due to junction
conditions that demand continuity of the Ricci scalar and its normal derivative
across the time-like collapsing hypersurface. These are obtained via the method
of $R$-matching, which is ubiquitous in $f(R)$ collapse scenarios. In this
paper, we stu... | [
{
"created": "Tue, 10 Sep 2019 11:19:19 GMT",
"version": "v1"
}
] | 2020-10-28 | [
[
"Chowdhury",
"Sandip",
""
],
[
"Pal",
"Kunal",
""
],
[
"Pal",
"Kuntal",
""
],
[
"Sarkar",
"Tapobrata",
""
]
] | Collapsing solutions in $f(R)$ gravity are restricted due to junction conditions that demand continuity of the Ricci scalar and its normal derivative across the time-like collapsing hypersurface. These are obtained via the method of $R$-matching, which is ubiquitous in $f(R)$ collapse scenarios. In this paper, we study... |
2208.06899 | Marie-No\"elle C\'el\'erier | Marie-No\''elle C\'el\'erier (Observatoire de Paris) | Study of stationary rigidly rotating anisotropic cylindrical fluids with
new exact interior solutions of GR. 4. Radial pressure | 11 pages, 0 figures | null | 10.1063/5.0121169 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | This article belongs to a series where the influence of anisotropic pressure
on the gravitational properties of rigidly rotating fluids is studied using new
exactsolutions of GR constructed for the purpose. For mathematical
simplification, stationarity and cylindrical symmetry implying three Killing
vectors are consi... | [
{
"created": "Sun, 14 Aug 2022 18:59:37 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Aug 2023 08:09:55 GMT",
"version": "v2"
}
] | 2023-08-08 | [
[
"Célérier",
"Marie-No\\''elle",
"",
"Observatoire de Paris"
]
] | This article belongs to a series where the influence of anisotropic pressure on the gravitational properties of rigidly rotating fluids is studied using new exactsolutions of GR constructed for the purpose. For mathematical simplification, stationarity and cylindrical symmetry implying three Killing vectors are conside... |
gr-qc/9804081 | Mikel Susperregi | Mikel Susperregi (QMW, London), Anupam Mazumdar (U. of Sussex) | Extended Inflation with an Exponential Potential | 6 pages, 2 figures | Phys.Rev.D58:083512,1998 | 10.1103/PhysRevD.58.083512 | null | gr-qc astro-ph | null | In this paper we investigate extended inflation with an exponential potential
$V(\sigma)= V_0 e^{-\kappa\sigma}$, which provides a simple cosmological
scenario where the distribution of the constants of Nature is mostly determined
by $\kappa$. In particular, we show that this theory predicts a uniform
distribution fo... | [
{
"created": "Wed, 29 Apr 1998 16:44:09 GMT",
"version": "v1"
}
] | 2011-01-20 | [
[
"Susperregi",
"Mikel",
"",
"QMW, London"
],
[
"Mazumdar",
"Anupam",
"",
"U. of Sussex"
]
] | In this paper we investigate extended inflation with an exponential potential $V(\sigma)= V_0 e^{-\kappa\sigma}$, which provides a simple cosmological scenario where the distribution of the constants of Nature is mostly determined by $\kappa$. In particular, we show that this theory predicts a uniform distribution for ... |
0810.5223 | Miodrag Krmar | Vladan Pankovic and Simo Ciganovic | A Simple Determination of the Thermodynamical Characteristics of the
Weakly Charged, Very Thin Black Ring | six pages, no figures | null | null | NS-Ph/18-08 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In our previous work we suggested a very simple, approximate formalism for
description of some basic (especially thermodynamical) characteristics of a
non-charged, rotating, very thin black ring. Here, in our new work,
generalizing our previous results, we suggest a very simple, approximate
description of some basic ... | [
{
"created": "Wed, 29 Oct 2008 09:43:18 GMT",
"version": "v1"
}
] | 2008-10-30 | [
[
"Pankovic",
"Vladan",
""
],
[
"Ciganovic",
"Simo",
""
]
] | In our previous work we suggested a very simple, approximate formalism for description of some basic (especially thermodynamical) characteristics of a non-charged, rotating, very thin black ring. Here, in our new work, generalizing our previous results, we suggest a very simple, approximate description of some basic (e... |
1912.11851 | Cameron Bunney | Cameron R. D. Bunney and Gabriele Gradoni | Electromagnetism in Curved Spacetimes: Coupling of the Doppler and
Gravitational Redshifts | 11 pages, 4 figures; v4 typos corrected. In previous versions, the
emitted and observed frequencies were mislabelled in the section
"Gravitational Redshift." | null | 10.1109/MAP.2021.3099714 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the basic prerequisites of electromagnetism in flat spacetime and
provide the description of electromagnetism in terms of the Faraday tensor. We
generalise electromagnetic theory to a general relativistic setting,
introducing the Einstein field equations to describe the propagation of
electromagnetic radia... | [
{
"created": "Thu, 26 Dec 2019 12:19:32 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Sep 2020 18:18:46 GMT",
"version": "v2"
},
{
"created": "Sun, 25 Apr 2021 20:53:46 GMT",
"version": "v3"
},
{
"created": "Thu, 12 Oct 2023 13:53:21 GMT",
"version": "v4"
}
] | 2023-10-13 | [
[
"Bunney",
"Cameron R. D.",
""
],
[
"Gradoni",
"Gabriele",
""
]
] | We present the basic prerequisites of electromagnetism in flat spacetime and provide the description of electromagnetism in terms of the Faraday tensor. We generalise electromagnetic theory to a general relativistic setting, introducing the Einstein field equations to describe the propagation of electromagnetic radiati... |
0710.0435 | Shih-Yuin Lin | Shih-Yuin Lin and B. L. Hu | Entanglement, recoherence and information flow in an accelerated
detector - quantum field system: Implications for black hole information
issue | 16 pages, 12 figures; minor changes | Class.Quant.Grav.25:154004,2008 | 10.1088/0264-9381/25/15/154004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study an exactly solvable model where an uniformly accelerated detector is
linearly coupled to a massless scalar field initially in the Minkowski vacuum.
Using the exact correlation functions we show that as soon as the coupling is
switched on one can see information flowing from the detector to the field and
prop... | [
{
"created": "Tue, 2 Oct 2007 03:41:43 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Nov 2007 10:46:19 GMT",
"version": "v2"
},
{
"created": "Thu, 24 Jul 2008 07:21:23 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Lin",
"Shih-Yuin",
""
],
[
"Hu",
"B. L.",
""
]
] | We study an exactly solvable model where an uniformly accelerated detector is linearly coupled to a massless scalar field initially in the Minkowski vacuum. Using the exact correlation functions we show that as soon as the coupling is switched on one can see information flowing from the detector to the field and propag... |
2302.11528 | Boran Yesilyurt | R. P. Woodard and B. Yesilyurt | Unfinished Business in A Nonlinear Sigma Model on de Sitter Background | 23 pages, 11 figures, uses LaTeX2e, Version 2 revised for publication
with 5 figures and length of 25 pages | JHEP 06 (2023) 206 | 10.1007/JHEP06(2023)206 | UFIFT-QG-23-03 | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Nonlinear sigma models on de Sitter background possess the same kind of
derivative interactions as gravity, and show the same sorts of large spacetime
logarithms in correlation functions and solutions to the effective field
equations. It was recently demonstrated that these logarithms can be resummed
by combining a v... | [
{
"created": "Wed, 22 Feb 2023 18:09:39 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Jul 2023 02:43:04 GMT",
"version": "v2"
}
] | 2023-07-06 | [
[
"Woodard",
"R. P.",
""
],
[
"Yesilyurt",
"B.",
""
]
] | Nonlinear sigma models on de Sitter background possess the same kind of derivative interactions as gravity, and show the same sorts of large spacetime logarithms in correlation functions and solutions to the effective field equations. It was recently demonstrated that these logarithms can be resummed by combining a var... |
0707.4513 | Simone Speziale | Bianca Dittrich, Laurent Freidel and Simone Speziale | Linearized dynamics from the 4-simplex Regge action | 16 (+9 Appendix) pages, 1 figure | Phys.Rev.D76:104020,2007 | 10.1103/PhysRevD.76.104020 | pi-qg-48 | gr-qc hep-lat | null | We study the relation between the hessian matrix of the riemannian Reggae
action on a 4-simplex and linearized quantum gravity. We give an explicit
formula for the hessian as a function of the geometry, and show that it has a
single zero mode. We then use a 3d lattice model to show that (i) the zero mode
is a remnant... | [
{
"created": "Tue, 31 Jul 2007 00:28:40 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Dittrich",
"Bianca",
""
],
[
"Freidel",
"Laurent",
""
],
[
"Speziale",
"Simone",
""
]
] | We study the relation between the hessian matrix of the riemannian Reggae action on a 4-simplex and linearized quantum gravity. We give an explicit formula for the hessian as a function of the geometry, and show that it has a single zero mode. We then use a 3d lattice model to show that (i) the zero mode is a remnant o... |
1712.00483 | Joel Berg\'e | Joel Berg\'e, Philippe Brax, Gilles M\'etris, Martin Pernot-Borr\`as,
Pierre Touboul, Jean-Philippe Uzan | MICROSCOPE mission: first constraints on the violation of the weak
equivalence principle by a light scalar dilaton | Matches publlished version. Supplemental material added | Phys. Rev. Lett. 120, 141101 (2018) | 10.1103/PhysRevLett.120.141101 | null | gr-qc astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The existence of a light or massive scalar field with a coupling to matter
weaker than gravitational strength is a possible source of violation of the
weak equivalence principle. We use the first results on the E\"otv\"os
parameter by the MICROSCOPE experiment to set new constraints on such scalar
fields. For a massi... | [
{
"created": "Fri, 1 Dec 2017 20:32:30 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Dec 2017 15:21:23 GMT",
"version": "v2"
},
{
"created": "Mon, 16 Apr 2018 21:04:43 GMT",
"version": "v3"
}
] | 2018-04-18 | [
[
"Bergé",
"Joel",
""
],
[
"Brax",
"Philippe",
""
],
[
"Métris",
"Gilles",
""
],
[
"Pernot-Borràs",
"Martin",
""
],
[
"Touboul",
"Pierre",
""
],
[
"Uzan",
"Jean-Philippe",
""
]
] | The existence of a light or massive scalar field with a coupling to matter weaker than gravitational strength is a possible source of violation of the weak equivalence principle. We use the first results on the E\"otv\"os parameter by the MICROSCOPE experiment to set new constraints on such scalar fields. For a massive... |
1306.6233 | Runqiu Yang | Rong-Gen Cai, Li-Ming Cao, Li Li, and Run-Qiu Yang | P-V criticality in the extended phase space of Gauss-Bonnet black holes
in AdS space | 23 pages,9 figures | null | 10.1007/JHEP09(2013)005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the $P-V$ criticality and phase transition in the extended phase
space of charged Gauss-Bonnet black holes in anti-de Sitter space, where the
cosmological constant appears as a dynamical pressure of the system and its
conjugate quantity is the thermodynamic volume of the black hole. The black
holes can have ... | [
{
"created": "Wed, 26 Jun 2013 13:24:52 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Jun 2013 03:22:35 GMT",
"version": "v2"
},
{
"created": "Thu, 4 Jul 2013 15:44:09 GMT",
"version": "v3"
},
{
"created": "Sat, 10 Aug 2013 02:25:29 GMT",
"version": "v4"
}
] | 2015-06-16 | [
[
"Cai",
"Rong-Gen",
""
],
[
"Cao",
"Li-Ming",
""
],
[
"Li",
"Li",
""
],
[
"Yang",
"Run-Qiu",
""
]
] | We study the $P-V$ criticality and phase transition in the extended phase space of charged Gauss-Bonnet black holes in anti-de Sitter space, where the cosmological constant appears as a dynamical pressure of the system and its conjugate quantity is the thermodynamic volume of the black hole. The black holes can have a ... |
2203.07069 | Samuel Barroso Bellido | Samuel Barroso Bellido, Mariusz P. Dabrowski | Observational Imprints of Our Lost Twin Anti-Universe | 14 pages, 1 figure. To be published | null | 10.1140/epjc/s10052-022-10945-2 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We consider observational consequences of the entanglement between our
universe and a hypothetical twin anti-universe in the third quantization scheme
of the canonical quantum gravity. Based on our previous investigations we
select some special form of the interuniversal interaction which allows the
entanglement entr... | [
{
"created": "Fri, 11 Mar 2022 12:56:40 GMT",
"version": "v1"
}
] | 2022-11-08 | [
[
"Bellido",
"Samuel Barroso",
""
],
[
"Dabrowski",
"Mariusz P.",
""
]
] | We consider observational consequences of the entanglement between our universe and a hypothetical twin anti-universe in the third quantization scheme of the canonical quantum gravity. Based on our previous investigations we select some special form of the interuniversal interaction which allows the entanglement entrop... |
gr-qc/9704037 | Raul Abramo | L.R. Abramo, R.H. Brandenberger, V.M. Mukhanov | The Energy-Momentum Tensor for Cosmological Perturbations | 29 pages, LaTex; to appear in Phys. Rev. D | Phys.Rev. D56 (1997) 3248-3257 | 10.1103/PhysRevD.56.3248 | BROWN-HET-1046 | gr-qc astro-ph hep-ph hep-th | null | We study the effective energy-momentum tensor (EMT) for cosmological
perturbations and formulate the gravitational back-reaction problem in a gauge
invariant manner. We analyze the explicit expressions for the EMT in the cases
of scalar metric fluctuations and of gravitational waves and derive the
resulting equations... | [
{
"created": "Mon, 14 Apr 1997 17:06:17 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Apr 1997 16:48:36 GMT",
"version": "v2"
},
{
"created": "Fri, 18 Apr 1997 22:22:21 GMT",
"version": "v3"
},
{
"created": "Thu, 24 Apr 1997 19:46:58 GMT",
"version": "v4"
},
{
"c... | 2009-10-30 | [
[
"Abramo",
"L. R.",
""
],
[
"Brandenberger",
"R. H.",
""
],
[
"Mukhanov",
"V. M.",
""
]
] | We study the effective energy-momentum tensor (EMT) for cosmological perturbations and formulate the gravitational back-reaction problem in a gauge invariant manner. We analyze the explicit expressions for the EMT in the cases of scalar metric fluctuations and of gravitational waves and derive the resulting equations o... |
1901.03390 | Anto Sulaksono | A. B. Wahidin, A. Rahmansyah, and A. Sulaksono | Effect of Scalar Boson on Fermionic Dark Star | 27 pages,11 figures, accepted for publication in IJMPD | null | 10.1142/S0218271819500718 | null | gr-qc astro-ph.SR hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The role of scalar boson exchange as a mediator of the fermionic dark
particle interaction and the mass of dark particle on the bulk properties of
fermionic dark stars including their moment of inertia and tidal deformability
are studied. We have found that the role of the attractive nature of the scalar
boson exchan... | [
{
"created": "Thu, 3 Jan 2019 07:32:21 GMT",
"version": "v1"
}
] | 2019-03-27 | [
[
"Wahidin",
"A. B.",
""
],
[
"Rahmansyah",
"A.",
""
],
[
"Sulaksono",
"A.",
""
]
] | The role of scalar boson exchange as a mediator of the fermionic dark particle interaction and the mass of dark particle on the bulk properties of fermionic dark stars including their moment of inertia and tidal deformability are studied. We have found that the role of the attractive nature of the scalar boson exchange... |
1612.03604 | Szymon Sikora | Szymon Sikora and Krzysztof G{\l}\'od | Example of an inhomogeneous cosmological model in the context of
backreaction | null | Phys. Rev. D 95, 063517 (2017) | 10.1103/PhysRevD.95.063517 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we present an example of an inhomogeneous cosmological
model, which is inspired by the linear perturbation theory. The metric of this
model can be described as the Einstein-de Sitter background with a periodically
distributed dust overdensities. The model construction enables application of
the Green... | [
{
"created": "Mon, 12 Dec 2016 10:41:11 GMT",
"version": "v1"
}
] | 2017-03-29 | [
[
"Sikora",
"Szymon",
""
],
[
"Głód",
"Krzysztof",
""
]
] | In this article, we present an example of an inhomogeneous cosmological model, which is inspired by the linear perturbation theory. The metric of this model can be described as the Einstein-de Sitter background with a periodically distributed dust overdensities. The model construction enables application of the Green-W... |
1312.3462 | Tomi Koivisto | Tomi Sebastian Koivisto, Danielle Elizabeth Wills | Matters on a moving brane | 7 pages, 2 pictures. Received an Honorable Mention in the Gravity
Research Foundation Essay Contest 2013 | Int.J.Mod.Phys. D22 (2013) 1342024 | 10.1142/S0218271813420248 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A novel generalisation of the Dirac-Born-Infeld string scenario is described.
It is shown that matter residing on the moving brane is dark and has the
so-called disformal coupling to gravity. This gives rise to cosmologies where
dark matter stems from the oscillations of the open strings along the brane and
the trans... | [
{
"created": "Thu, 12 Dec 2013 12:22:14 GMT",
"version": "v1"
}
] | 2013-12-18 | [
[
"Koivisto",
"Tomi Sebastian",
""
],
[
"Wills",
"Danielle Elizabeth",
""
]
] | A novel generalisation of the Dirac-Born-Infeld string scenario is described. It is shown that matter residing on the moving brane is dark and has the so-called disformal coupling to gravity. This gives rise to cosmologies where dark matter stems from the oscillations of the open strings along the brane and the transve... |
1104.3494 | Marc Lilley | Marc Lilley, Larissa Lorenz, Sebastien Clesse | Observational signatures of a non-singular bouncing cosmology | 40 pages, 5 figures, typos corrected and reference added | JCAP06(2011)004 | 10.1088/1475-7516/2011/06/004 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a cosmological scenario in which inflation is preceded by a bounce.
In this scenario, the primordial singularity, one of the major shortcomings of
inflation, is replaced by a non-singular bounce, prior to which the universe
undergoes a phase of contraction. Our starting point is the bouncing cosmology
invest... | [
{
"created": "Mon, 18 Apr 2011 14:26:11 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Jun 2011 09:12:35 GMT",
"version": "v2"
}
] | 2015-05-27 | [
[
"Lilley",
"Marc",
""
],
[
"Lorenz",
"Larissa",
""
],
[
"Clesse",
"Sebastien",
""
]
] | We study a cosmological scenario in which inflation is preceded by a bounce. In this scenario, the primordial singularity, one of the major shortcomings of inflation, is replaced by a non-singular bounce, prior to which the universe undergoes a phase of contraction. Our starting point is the bouncing cosmology investig... |
gr-qc/9708071 | Hisaaki Shinkai | G. L. Comer (St. Louis Univ.) and Hisa-aki Shinkai (Washington Univ.,
St. Louis) | Generation of scalar-tensor gravity effects in equilibrium state boson
stars | 20 pages, RevTeX, 11 figures, to appear in Class. Quantum Grav.,
comments added, refs updated | Class.Quant.Grav. 15 (1998) 669-688 | 10.1088/0264-9381/15/3/016 | null | gr-qc | null | Boson stars in zero-, one-, and two-node equilibrium states are modeled
numerically within the framework of Scalar-Tensor Gravity. The complex scalar
field is taken to be both massive and self-interacting. Configurations are
formed in the case of a linear gravitational scalar coupling (the Brans-Dicke
case) and a qua... | [
{
"created": "Thu, 28 Aug 1997 21:26:54 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Dec 1997 20:46:50 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Comer",
"G. L.",
"",
"St. Louis Univ."
],
[
"Shinkai",
"Hisa-aki",
"",
"Washington Univ.,\n St. Louis"
]
] | Boson stars in zero-, one-, and two-node equilibrium states are modeled numerically within the framework of Scalar-Tensor Gravity. The complex scalar field is taken to be both massive and self-interacting. Configurations are formed in the case of a linear gravitational scalar coupling (the Brans-Dicke case) and a quadr... |
1101.5034 | Mauricio Cataldo MC | Mauricio Cataldo, Paola Meza and Paul Minning | N-dimensional static and evolving Lorentzian wormholes with cosmological
constant | 10 pages, accepted for publication in Phys. Rev. D | Phys.Rev.D83:044050,2011 | 10.1103/PhysRevD.83.044050 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a family of static and evolving spherically symmetric Lorentzian
wormhole solutions in N+1 dimensional Einstein gravity. In general, for static
wormholes, we require that at least the radial pressure has a barotropic
equation of state of the form $p_r=\omega_r \rho$, where the state parameter
$\omega_r$ is... | [
{
"created": "Wed, 26 Jan 2011 11:48:01 GMT",
"version": "v1"
}
] | 2011-03-23 | [
[
"Cataldo",
"Mauricio",
""
],
[
"Meza",
"Paola",
""
],
[
"Minning",
"Paul",
""
]
] | We present a family of static and evolving spherically symmetric Lorentzian wormhole solutions in N+1 dimensional Einstein gravity. In general, for static wormholes, we require that at least the radial pressure has a barotropic equation of state of the form $p_r=\omega_r \rho$, where the state parameter $\omega_r$ is c... |
1904.08617 | Mikica Kocic | Mikica Kocic, Francesco Torsello, Marcus H\"og\r{a}s and Edvard
Mortsell | Spherical dust collapse in bimetric relativity: Bimetric polytropes | 24 pages, 17 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a method for solving the constraint equations in the Hassan-Rosen
bimetric theory to determine the initial data for the gravitational collapse of
spherically symmetric dust. The setup leads to equations similar to those for a
polytropic fluid in general relativity, here called a generalized Lane-Emden
equa... | [
{
"created": "Thu, 18 Apr 2019 07:40:54 GMT",
"version": "v1"
}
] | 2019-04-19 | [
[
"Kocic",
"Mikica",
""
],
[
"Torsello",
"Francesco",
""
],
[
"Högås",
"Marcus",
""
],
[
"Mortsell",
"Edvard",
""
]
] | We present a method for solving the constraint equations in the Hassan-Rosen bimetric theory to determine the initial data for the gravitational collapse of spherically symmetric dust. The setup leads to equations similar to those for a polytropic fluid in general relativity, here called a generalized Lane-Emden equati... |
1502.02929 | Behzad Eslam Panah | G. H. Bordbar, S. H. Hendi and B. Eslam Panah | Neutron stars in Einstein-$\Lambda$ gravity: the cosmological constant
effects | 14 pages, 10 figures, title changed, numerical solutions added,
references added | Eur. Phys. J. Plus. 131, 315 (2016) | 10.1140/epjp/i2016-16315-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Regarding a $d-$dimensional spherically symmetric line element in the context
of Einstein-$\Lambda$ gravity, the hydrostatic equilibrium equation of stars is
obtained. Then, by using the lowest order constrained variational (LOCV) method
with the AV$18$ potential and employing microscopic many body calculations in
th... | [
{
"created": "Tue, 10 Feb 2015 15:00:39 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Jan 2016 18:23:42 GMT",
"version": "v2"
},
{
"created": "Thu, 26 Jan 2017 19:07:30 GMT",
"version": "v3"
}
] | 2017-01-30 | [
[
"Bordbar",
"G. H.",
""
],
[
"Hendi",
"S. H.",
""
],
[
"Panah",
"B. Eslam",
""
]
] | Regarding a $d-$dimensional spherically symmetric line element in the context of Einstein-$\Lambda$ gravity, the hydrostatic equilibrium equation of stars is obtained. Then, by using the lowest order constrained variational (LOCV) method with the AV$18$ potential and employing microscopic many body calculations in the ... |
1707.04938 | Willians Barreto | W. Barreto, H. P. de Oliveira and B. Rodriguez-Mueller | Fixed mesh refinement in the characteristic formulation of General
Relativity | 14 papes, 7 figures. To appear in General Relativity and Gravitation | General Relativity and Gravitation 49: 107 (2017) | 10.1007/s10714-017-2273-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We implement a spatially fixed mesh refinement under spherical symmetry for
the characteristic formulation of General Relativity. The
Courant-Friedrich-Levy (CFL) condition lets us deploy an adaptive resolution in
(retarded-like) time, even for the nonlinear regime. As test cases, we
replicate the main features of th... | [
{
"created": "Sun, 16 Jul 2017 19:45:30 GMT",
"version": "v1"
}
] | 2017-07-27 | [
[
"Barreto",
"W.",
""
],
[
"de Oliveira",
"H. P.",
""
],
[
"Rodriguez-Mueller",
"B.",
""
]
] | We implement a spatially fixed mesh refinement under spherical symmetry for the characteristic formulation of General Relativity. The Courant-Friedrich-Levy (CFL) condition lets us deploy an adaptive resolution in (retarded-like) time, even for the nonlinear regime. As test cases, we replicate the main features of the ... |
gr-qc/0607051 | Barry Holstein | Barry R. Holstein | Quantum Corrections to the Reissner-Nordstrom and Kerr-Newman Metrics:
Spin 1 | 21 pages, 1 Figure | null | 10.1103/PhysRevD.74.084030 | null | gr-qc hep-ph hep-th | null | A previous evaluation of one-photon loop corrections to the energy-momentum
tensor has been extended to particles with unit spin and speculations are
presented concerning general properties of such forms.
| [
{
"created": "Wed, 12 Jul 2006 15:59:21 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"Holstein",
"Barry R.",
""
]
] | A previous evaluation of one-photon loop corrections to the energy-momentum tensor has been extended to particles with unit spin and speculations are presented concerning general properties of such forms. |
1106.4627 | Subenoy Chakraborty | Nairwita Mazumder, Ritabrata Biswas, Subenoy Chakraborty | Interacting Holographic Dark Energy at the Ricci scale and Dynamical
system | 10 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we consider homogeneous and isotropic FRW model of the
universe, filled with interacting dark matter and dark energy. The dark matter
is chosen as usual in the form of dust while dark energy is holographic in
nature with IR cut off at the Ricci's length and it is in the form of a perfect
fluid with vari... | [
{
"created": "Thu, 23 Jun 2011 05:10:07 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Oct 2011 18:15:56 GMT",
"version": "v2"
}
] | 2011-10-21 | [
[
"Mazumder",
"Nairwita",
""
],
[
"Biswas",
"Ritabrata",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | In this work, we consider homogeneous and isotropic FRW model of the universe, filled with interacting dark matter and dark energy. The dark matter is chosen as usual in the form of dust while dark energy is holographic in nature with IR cut off at the Ricci's length and it is in the form of a perfect fluid with variab... |
gr-qc/0511054 | Michael Maziashvili | Michael Maziashvili | Black hole remnants due to GUP or quantum gravity? | 3 pages | Phys.Lett.B635:232-234,2006 | 10.1016/j.physletb.2006.03.009 | null | gr-qc hep-ph hep-th | null | Based on the micro-black hole \emph{gedanken} experiment as well as on
general considerations of quantum mechanics and gravity the generalized
uncertainty principle (GUP) is analyzed by using the running Newton constant.
The result is used to decide between the GUP and quantum gravitational effects
as a possible mech... | [
{
"created": "Thu, 10 Nov 2005 10:48:39 GMT",
"version": "v1"
},
{
"created": "Sat, 11 Mar 2006 12:58:46 GMT",
"version": "v2"
}
] | 2010-11-05 | [
[
"Maziashvili",
"Michael",
""
]
] | Based on the micro-black hole \emph{gedanken} experiment as well as on general considerations of quantum mechanics and gravity the generalized uncertainty principle (GUP) is analyzed by using the running Newton constant. The result is used to decide between the GUP and quantum gravitational effects as a possible mechan... |
1802.08553 | Ritabrata Biswas | Sandip Dutta and Ritabrata Biswas | Dark Energy Accretion onto Van der Waal's Black Hole | 17 pages, 12 figures, Accepted for publication in Communications in
Theoretical Physics | null | 10.1088/0253-6102/71/2/209 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the most general static spherically symmetric black hole metric.
The accretion of the fluid flow around the Van der Waal's black hole is
investigated and we calculate the fluid's four-velocity, the critical point and
the speed of sound during the accretion process. We also analyze the nature of
the univer... | [
{
"created": "Wed, 21 Feb 2018 11:53:06 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Jul 2018 10:50:19 GMT",
"version": "v2"
}
] | 2019-03-27 | [
[
"Dutta",
"Sandip",
""
],
[
"Biswas",
"Ritabrata",
""
]
] | We consider the most general static spherically symmetric black hole metric. The accretion of the fluid flow around the Van der Waal's black hole is investigated and we calculate the fluid's four-velocity, the critical point and the speed of sound during the accretion process. We also analyze the nature of the universe... |
2402.16163 | J\'unior Diniz Toniato | Mario Novello and J\'unior D. Toniato | An overview of field theories of gravity | 35 pages, 3 figures, to appear as chapter in "Tribute to Ruben
Aldrovandi", edited by F. Caruso, J.G. Pereira and A. Santoro (Editora
Livraria da F\'isica, S\~ao Paulo, 2024) | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In the general relativity theory the basic ingredient to describe gravity is
the geometry, which interacts with all forms of matter and energy, and as such,
the metric could be interpreted as a true physical quantity. However the metric
is not matter nor energy, but instead it is a new dynamical variable that
Einstei... | [
{
"created": "Sun, 25 Feb 2024 18:00:08 GMT",
"version": "v1"
}
] | 2024-02-27 | [
[
"Novello",
"Mario",
""
],
[
"Toniato",
"Júnior D.",
""
]
] | In the general relativity theory the basic ingredient to describe gravity is the geometry, which interacts with all forms of matter and energy, and as such, the metric could be interpreted as a true physical quantity. However the metric is not matter nor energy, but instead it is a new dynamical variable that Einstein ... |
1411.6410 | David Vitali | Mateusz Bawaj, Ciro Biancofiore, Michele Bonaldi, Federica Bonfigli,
Antonio Borrielli, Giovanni Di Giuseppe, Lorenzo Marconi, Francesco Marino,
Riccardo Natali, Antonio Pontin, Giovanni A. Prodi, Enrico Serra, David
Vitali, and Francesco Marin | Probing deformed commutators with macroscopic harmonic oscillators | 11 pages, 3 figures, reference added | Nature Communications 6, 7503 (2015) | 10.1038/ncomms8503 | null | gr-qc physics.optics quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A minimal observable length is a common feature of theories that aim to merge
quantum physics and gravity. Quantum mechanically, this concept is associated
to a nonzero minimal uncertainty in position measurements, which is encoded in
deformed commutation relations. In spite of increasing theoretical interest,
the su... | [
{
"created": "Mon, 24 Nov 2014 11:03:44 GMT",
"version": "v1"
},
{
"created": "Sun, 2 Aug 2015 22:30:57 GMT",
"version": "v2"
},
{
"created": "Tue, 25 Aug 2015 14:55:25 GMT",
"version": "v3"
}
] | 2015-08-26 | [
[
"Bawaj",
"Mateusz",
""
],
[
"Biancofiore",
"Ciro",
""
],
[
"Bonaldi",
"Michele",
""
],
[
"Bonfigli",
"Federica",
""
],
[
"Borrielli",
"Antonio",
""
],
[
"Di Giuseppe",
"Giovanni",
""
],
[
"Marconi",
"Lorenzo",
... | A minimal observable length is a common feature of theories that aim to merge quantum physics and gravity. Quantum mechanically, this concept is associated to a nonzero minimal uncertainty in position measurements, which is encoded in deformed commutation relations. In spite of increasing theoretical interest, the subj... |
1502.05875 | Tirthabir Biswas | Tirthabir Biswas, Riley Mayes and Colleen Lattyak | Perturbations in Bouncing and Cyclic Models, a General Study | 21 pages, 12 figures | Phys. Rev. D 93, 063505 (2016) | 10.1103/PhysRevD.93.063505 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Being able to reliably track perturbations across bounces and turnarounds in
cyclic and bouncing cosmology lies at the heart of being able to compare the
predictions of these models with the Cosmic Microwave Background observations.
This has been a challenging task due to the unknown nature of the physics
involved du... | [
{
"created": "Wed, 18 Feb 2015 00:14:27 GMT",
"version": "v1"
}
] | 2016-03-23 | [
[
"Biswas",
"Tirthabir",
""
],
[
"Mayes",
"Riley",
""
],
[
"Lattyak",
"Colleen",
""
]
] | Being able to reliably track perturbations across bounces and turnarounds in cyclic and bouncing cosmology lies at the heart of being able to compare the predictions of these models with the Cosmic Microwave Background observations. This has been a challenging task due to the unknown nature of the physics involved duri... |
1405.4881 | Yuki Yokokura | Laurent Freidel, Yuki Yokokura | Non-equilibrium thermodynamics of gravitational screens | 30 pages, 3 figures. This is the published version in Classical and
Quantum Gravity. Typos are modified, references are added, discussions
(especially, of section 6) are clarified but the main results do not change | null | 10.1088/0264-9381/32/21/215002 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the Einstein gravity equations projected on a timelike surface,
which represents the time evolution of what we call a gravitational screen. We
show that such a screen behaves like a viscous bubble with a surface tension
and an internal energy, and that the Einstein equations take the same forms as
non-equili... | [
{
"created": "Mon, 19 May 2014 20:22:28 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Oct 2015 06:54:06 GMT",
"version": "v2"
}
] | 2015-10-07 | [
[
"Freidel",
"Laurent",
""
],
[
"Yokokura",
"Yuki",
""
]
] | We study the Einstein gravity equations projected on a timelike surface, which represents the time evolution of what we call a gravitational screen. We show that such a screen behaves like a viscous bubble with a surface tension and an internal energy, and that the Einstein equations take the same forms as non-equilibr... |
0705.1570 | Andrey Shoom A | Valeri P. Frolov and Andrey A. Shoom | Interior of Distorted Black Holes | 12 pages, 16 figures | Phys.Rev.D76:064037,2007 | 10.1103/PhysRevD.76.064037 | null | gr-qc hep-th | null | We study the interior of distorted static axisymmetric black holes. We obtain
a general interior solution and study its asymptotics both near the horizon and
singularity. As a special example, we apply the obtained results to the case of
the so-called `caged' black holes.
| [
{
"created": "Fri, 11 May 2007 00:05:36 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Frolov",
"Valeri P.",
""
],
[
"Shoom",
"Andrey A.",
""
]
] | We study the interior of distorted static axisymmetric black holes. We obtain a general interior solution and study its asymptotics both near the horizon and singularity. As a special example, we apply the obtained results to the case of the so-called `caged' black holes. |
gr-qc/0610033 | Muhammad Sharif | M. Sharif and Zahid Ahmad | Gravitational Perfect Fluid Collapse With Cosmological Constant | LaTex 13 pages, accepted for publication in Mod. Phys. Lett. A | Mod.Phys.Lett.A22:1493-1502,2007;
Mod.Phys.Lett.A22:2947-2948(Addendum),2007 | 10.1142/S0217732307021834 10.1142/S0217732307025972 | null | gr-qc | null | In this paper, the effect of a positive cosmological constant on spherically
symmetric collapse with perfect fluid has been investigated. The matching
conditions between static exterior and non-static interior spacetimes are given
in the presence of a cosmological constant. We also study the apparent horizons
and the... | [
{
"created": "Mon, 9 Oct 2006 03:02:33 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Sharif",
"M.",
""
],
[
"Ahmad",
"Zahid",
""
]
] | In this paper, the effect of a positive cosmological constant on spherically symmetric collapse with perfect fluid has been investigated. The matching conditions between static exterior and non-static interior spacetimes are given in the presence of a cosmological constant. We also study the apparent horizons and their... |
1701.06662 | Kirill Bronnikov | Kirill A. Bronnikov, Julio C. Fabris, Oliver F. Piattella, Denis C.
Rodrigues, Edison C. Santos | Duality between k-essence and Rastall gravity | 10 pages, no figures. Two references added | Eur. Phys. J. C 77, 409 (2017) | 10.1140/epjc/s10052-017-4977-4 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The k-essence theory with a power-law function of $(\partial\phi)^2$ and
Rastall's non-conservative theory of gravity with a scalar field are shown to
have the same solutions for the metric under the assumption that both the
metric and the scalar fields depend on a single coordinate. This equivalence
(called k-R dual... | [
{
"created": "Mon, 23 Jan 2017 22:47:51 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Jan 2017 00:24:59 GMT",
"version": "v2"
}
] | 2017-09-19 | [
[
"Bronnikov",
"Kirill A.",
""
],
[
"Fabris",
"Julio C.",
""
],
[
"Piattella",
"Oliver F.",
""
],
[
"Rodrigues",
"Denis C.",
""
],
[
"Santos",
"Edison C.",
""
]
] | The k-essence theory with a power-law function of $(\partial\phi)^2$ and Rastall's non-conservative theory of gravity with a scalar field are shown to have the same solutions for the metric under the assumption that both the metric and the scalar fields depend on a single coordinate. This equivalence (called k-R dualit... |
gr-qc/0207014 | Hongsu Kim | Hongsu Kim | Removal of Closed Timelike Curves in Kerr-Newman Spacetime | 14 pages, Revtex, Typos corrected | null | null | null | gr-qc astro-ph hep-th | null | A simple yet systematic new algorithm to investigate the global structure of
Kerr-Newman spacetime is suggested. Namely, the global structure of
\theta=const. timelike submanifolds of Kerr-Newman metric are studied by
introducing a new time coordinate slightly different from the usual
Boyer-Lindquist time coordinate.... | [
{
"created": "Tue, 2 Jul 2002 09:08:16 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Jul 2002 06:56:51 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Kim",
"Hongsu",
""
]
] | A simple yet systematic new algorithm to investigate the global structure of Kerr-Newman spacetime is suggested. Namely, the global structure of \theta=const. timelike submanifolds of Kerr-Newman metric are studied by introducing a new time coordinate slightly different from the usual Boyer-Lindquist time coordinate. I... |
gr-qc/9403012 | Ralph Scott | Raymond S. Puzio | The Gauss Map and 2+1 Gravity | null | Class.Quant.Grav.11:2667-2676,1994 | 10.1088/0264-9381/11/11/009 | null | gr-qc | null | We prove that the Gauss map of a surface of constant mean curvature embedded
in Minkowski space is harmonic. This fact will then be used to study 2+1
gravity for surfaces of genus higher than one. By considering the energy of the
Gauss map, a canonical transform between the ADM reduced variables and holonomy
variable... | [
{
"created": "Fri, 4 Mar 1994 06:53:14 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Puzio",
"Raymond S.",
""
]
] | We prove that the Gauss map of a surface of constant mean curvature embedded in Minkowski space is harmonic. This fact will then be used to study 2+1 gravity for surfaces of genus higher than one. By considering the energy of the Gauss map, a canonical transform between the ADM reduced variables and holonomy variables ... |
1004.3235 | Steinar Johannesen | Oyvind Gron and Steinar Johannesen | A spacetime with closed timelike geodesics everywhere | 7 pages, 1 figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present article we find a new class of solutions of Einstein's field
equations. It describes stationary, cylindrically symmetric spacetimes with
closed timelike geodesics everywhere outside the symmetry axis. These
spacetimes contain a magnetic field parallel to the axis, a perfect fluid with
constant density ... | [
{
"created": "Mon, 19 Apr 2010 15:44:38 GMT",
"version": "v1"
}
] | 2010-04-20 | [
[
"Gron",
"Oyvind",
""
],
[
"Johannesen",
"Steinar",
""
]
] | In the present article we find a new class of solutions of Einstein's field equations. It describes stationary, cylindrically symmetric spacetimes with closed timelike geodesics everywhere outside the symmetry axis. These spacetimes contain a magnetic field parallel to the axis, a perfect fluid with constant density an... |
gr-qc/9801032 | Patrick R. Brady | Patrick R. Brady, Ian G. Moss and Robert C. Myers | Cosmic Censorship: As Strong As Ever | 4 pages RevTeX style, 1 figure included using epsfig | Phys.Rev.Lett. 80 (1998) 3432-3435 | 10.1103/PhysRevLett.80.3432 | NSF-ITP-98-001, GRP-490 | gr-qc | null | Spacetimes which have been considered counter-examples to strong cosmic
censorship are revisited. We demonstrate the classical instability of the
Cauchy horizon inside charged black holes embedded in de Sitter spacetime for
all values of the physical parameters. The relevant modes which maintain the
instability, in t... | [
{
"created": "Mon, 12 Jan 1998 17:10:18 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Brady",
"Patrick R.",
""
],
[
"Moss",
"Ian G.",
""
],
[
"Myers",
"Robert C.",
""
]
] | Spacetimes which have been considered counter-examples to strong cosmic censorship are revisited. We demonstrate the classical instability of the Cauchy horizon inside charged black holes embedded in de Sitter spacetime for all values of the physical parameters. The relevant modes which maintain the instability, in the... |
1102.5636 | Alexander Petrov Nikolaevich | A.N. Petrov | Noether and Belinfante corrected types of currents for perturbations in
the Einstein-Gauss-Bonnet gravity | 22 pages, no figures, version accepted to CQG | Class. Quantum Grav. 28 (2011) 215021 (17pp) | 10.1088/0264-9381/28/21/215021 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of an arbitrary $D$-dimensional metric theory, perturbations
are considered on arbitrary backgrounds that are however solutions of the
theory. Conserved currents for perturbations are presented following two known
prescriptions: canonical N{\oe}ther theorem and Belinfante symmetrization rule.
Using g... | [
{
"created": "Mon, 28 Feb 2011 10:55:04 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Oct 2011 08:54:39 GMT",
"version": "v2"
}
] | 2015-05-27 | [
[
"Petrov",
"A. N.",
""
]
] | In the framework of an arbitrary $D$-dimensional metric theory, perturbations are considered on arbitrary backgrounds that are however solutions of the theory. Conserved currents for perturbations are presented following two known prescriptions: canonical N{\oe}ther theorem and Belinfante symmetrization rule. Using gen... |
1904.00384 | Gianluca Calcagni | Gianluca Calcagni, Sachiko Kuroyanagi, Sylvain Marsat, Mairi
Sakellariadou, Nicola Tamanini, Gianmassimo Tasinato | Gravitational-wave luminosity distance in quantum gravity | 6 pages, 1 figure. v2: discussion improved; v3: references updated | Phys. Lett. B 798 (2019) 135000 | 10.1016/j.physletb.2019.135000 | KCL-PH-TH/2019-30 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dimensional flow, the scale dependence of the dimensionality of spacetime, is
a feature shared by many theories of quantum gravity (QG). We present the first
study of the consequences of QG dimensional flow for the luminosity distance
scaling of gravitational waves in the frequency ranges of LIGO and LISA. We
find ge... | [
{
"created": "Sun, 31 Mar 2019 11:31:22 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Jul 2019 08:21:49 GMT",
"version": "v2"
},
{
"created": "Fri, 11 Oct 2019 11:38:06 GMT",
"version": "v3"
}
] | 2019-10-14 | [
[
"Calcagni",
"Gianluca",
""
],
[
"Kuroyanagi",
"Sachiko",
""
],
[
"Marsat",
"Sylvain",
""
],
[
"Sakellariadou",
"Mairi",
""
],
[
"Tamanini",
"Nicola",
""
],
[
"Tasinato",
"Gianmassimo",
""
]
] | Dimensional flow, the scale dependence of the dimensionality of spacetime, is a feature shared by many theories of quantum gravity (QG). We present the first study of the consequences of QG dimensional flow for the luminosity distance scaling of gravitational waves in the frequency ranges of LIGO and LISA. We find gene... |
0910.3140 | Steven B. Giddings | Steven B. Giddings | Beyond the Planck scale | 11 pages, 1 figure. To appear in the proceedings of the XXV Max Born
Symposium, "The Planck Scale," Wroclaw, Poland | null | 10.1063/1.3284370 | CERN-PH-TH/2009-193 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I outline motivations for believing that important quantum gravity effects
lie beyond the Planck scale at both higher energies and longer distances and
times. These motivations arise in part from the study of ultra-high energy
scattering, and also from considerations in cosmology. I briefly summarize some
inferences ... | [
{
"created": "Fri, 16 Oct 2009 15:22:54 GMT",
"version": "v1"
}
] | 2015-05-14 | [
[
"Giddings",
"Steven B.",
""
]
] | I outline motivations for believing that important quantum gravity effects lie beyond the Planck scale at both higher energies and longer distances and times. These motivations arise in part from the study of ultra-high energy scattering, and also from considerations in cosmology. I briefly summarize some inferences ab... |
2203.16083 | Alexander B. Balakin | Alexander B. Balakin and Alexei S. Ilin | Self-interaction in a cosmic dark fluid: The four-kernel rheological
extension of the equations of state | 19 pages, 3 figures | Phys. Rev. D, 105, 103525 (2022) | 10.1103/PhysRevD.105.103525 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We establish a new self-consistent model of coupling between the cosmic dark
energy and dark matter in the framework of the rheological approach, which is
based on the representation of the equations of state in terms of integral
operators of the Volterra-type. We elaborate the so-called four-kernel model,
in the fra... | [
{
"created": "Wed, 30 Mar 2022 06:23:56 GMT",
"version": "v1"
}
] | 2022-06-09 | [
[
"Balakin",
"Alexander B.",
""
],
[
"Ilin",
"Alexei S.",
""
]
] | We establish a new self-consistent model of coupling between the cosmic dark energy and dark matter in the framework of the rheological approach, which is based on the representation of the equations of state in terms of integral operators of the Volterra-type. We elaborate the so-called four-kernel model, in the frame... |
2103.14663 | Simone Mastrogiovanni | S. Mastrogiovanni, K. Leyde, C. Karathanasis, E. Chassande-Mottin, D.
A. Steer, J. Gair, A. Ghosh, R. Gray, S. Mukherjee, S. Rinaldi | Cosmology in the dark: On the importance of source population models for
gravitational-wave cosmology | 20 pages, 12 figures | Phys. Rev. D 104, 062009 (2021) | 10.1103/PhysRevD.104.062009 | null | gr-qc astro-ph.CO astro-ph.SR | http://creativecommons.org/licenses/by/4.0/ | Knowledge of the shape of the mass spectrum of compact objects can be used to
help break the degeneracy between the mass and redshift of the gravitational
wave (GW) sources, and thus can be used to infer cosmological parameters in the
absence of redshift measurements obtained from electromagnetic observations. In
thi... | [
{
"created": "Fri, 26 Mar 2021 18:03:48 GMT",
"version": "v1"
},
{
"created": "Sat, 26 Jun 2021 12:05:04 GMT",
"version": "v2"
}
] | 2021-09-29 | [
[
"Mastrogiovanni",
"S.",
""
],
[
"Leyde",
"K.",
""
],
[
"Karathanasis",
"C.",
""
],
[
"Chassande-Mottin",
"E.",
""
],
[
"Steer",
"D. A.",
""
],
[
"Gair",
"J.",
""
],
[
"Ghosh",
"A.",
""
],
[
"Gray",
... | Knowledge of the shape of the mass spectrum of compact objects can be used to help break the degeneracy between the mass and redshift of the gravitational wave (GW) sources, and thus can be used to infer cosmological parameters in the absence of redshift measurements obtained from electromagnetic observations. In this ... |
0710.4252 | Sam Dolan Dr | Sam R. Dolan | Scattering of Long-Wavelength Gravitational Waves | 7 pages, no figs. Minor changes made to match published version | Phys.Rev.D77:044004,2008 | 10.1103/PhysRevD.77.044004 | null | gr-qc astro-ph | null | We consider the scattering of a low-frequency gravitational wave by a massive
compact body in vacuum. We apply partial-wave methods to compute amplitudes for
the helicity-conserving and helicity-reversing contributions to the cross
section, accurate to first order in $M\omega$. Contrary to previous claims, we
find th... | [
{
"created": "Tue, 23 Oct 2007 12:26:53 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Feb 2008 10:19:29 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Dolan",
"Sam R.",
""
]
] | We consider the scattering of a low-frequency gravitational wave by a massive compact body in vacuum. We apply partial-wave methods to compute amplitudes for the helicity-conserving and helicity-reversing contributions to the cross section, accurate to first order in $M\omega$. Contrary to previous claims, we find that... |
1707.09651 | Antonin Coutant | Antonin Coutant, Silke Weinfurtner | Low frequency analogue Hawking radiation: The Korteweg-de Vries model | 23 pages, 5 figures. v2: typo corrected, references added | Phys. Rev. D 97, 025005 (2018) | 10.1103/PhysRevD.97.025005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive analytic expressions for the low-frequency properties of the
analogue Hawking radiation in a general weak-dispersive medium. A thermal
low-frequency part of the spectrum is expected even when dispersive effects
become significant. We consider the two most common class of weak-dispersive
media and investigat... | [
{
"created": "Sun, 30 Jul 2017 17:52:34 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Jan 2018 17:22:18 GMT",
"version": "v2"
}
] | 2018-01-15 | [
[
"Coutant",
"Antonin",
""
],
[
"Weinfurtner",
"Silke",
""
]
] | We derive analytic expressions for the low-frequency properties of the analogue Hawking radiation in a general weak-dispersive medium. A thermal low-frequency part of the spectrum is expected even when dispersive effects become significant. We consider the two most common class of weak-dispersive media and investigate ... |
2110.11273 | Maria-Jose Guzman | Alexey Golovnev, Maria-Jose Guzman | Lorentz symmetries and primary constraints in covariant teleparallel
gravity | 19 pages, no figures, comments welcome | Phys. Rev. D 104, 124074 (2021) | 10.1103/PhysRevD.104.124074 | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | In this article we explore local Lorentz transformations in theories of
gravity based on the teleparallel formalism. For the teleparallel equivalent of
general relativity (TEGR), the spin connection plays no role in the equations
of motion, and therefore it is possible to simply put it equal to zero with no
change in... | [
{
"created": "Thu, 21 Oct 2021 17:01:07 GMT",
"version": "v1"
}
] | 2021-12-30 | [
[
"Golovnev",
"Alexey",
""
],
[
"Guzman",
"Maria-Jose",
""
]
] | In this article we explore local Lorentz transformations in theories of gravity based on the teleparallel formalism. For the teleparallel equivalent of general relativity (TEGR), the spin connection plays no role in the equations of motion, and therefore it is possible to simply put it equal to zero with no change in p... |
1412.8383 | Yen Chin Ong | Pisin Chen, Keisuke Izumi, James M. Nester, Yen Chin Ong | Remnant Symmetry, Propagation and Evolution in f(T) Gravity | Fixed typo. Version accepted by PRD | Phys. Rev. D 91, 064003 (2015) | 10.1103/PhysRevD.91.064003 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It was recently argued that f(T) gravity could inherit "remnant symmetry"
from the full Lorentz group, despite the fact that the theory is not locally
Lorentz invariant. Confusion has arisen regarding the implication of this
result for the previous works, which established that f(T) gravity is
pathological due to sup... | [
{
"created": "Mon, 29 Dec 2014 16:32:32 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Jan 2015 16:54:52 GMT",
"version": "v2"
},
{
"created": "Fri, 6 Mar 2015 21:55:56 GMT",
"version": "v3"
}
] | 2015-03-11 | [
[
"Chen",
"Pisin",
""
],
[
"Izumi",
"Keisuke",
""
],
[
"Nester",
"James M.",
""
],
[
"Ong",
"Yen Chin",
""
]
] | It was recently argued that f(T) gravity could inherit "remnant symmetry" from the full Lorentz group, despite the fact that the theory is not locally Lorentz invariant. Confusion has arisen regarding the implication of this result for the previous works, which established that f(T) gravity is pathological due to super... |
1106.1864 | Pablo Laguna | Tanja Bode, Pablo Laguna and Richard A. Matzner | Super-Extremal Spinning Black Holes via Accretion | 11 pages, 10 figures | null | 10.1103/PhysRevD.84.064044 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A Kerr black hole with mass $M$ and angular momentum $J$ satisfies the
extremality inequality $|J| \le M^2$. In the presence of matter and/or
gravitational radiation, this bound needs to be reformulated in terms of local
measurements of the mass and the angular momentum directly associated with the
black hole. The is... | [
{
"created": "Thu, 9 Jun 2011 17:22:37 GMT",
"version": "v1"
}
] | 2015-05-28 | [
[
"Bode",
"Tanja",
""
],
[
"Laguna",
"Pablo",
""
],
[
"Matzner",
"Richard A.",
""
]
] | A Kerr black hole with mass $M$ and angular momentum $J$ satisfies the extremality inequality $|J| \le M^2$. In the presence of matter and/or gravitational radiation, this bound needs to be reformulated in terms of local measurements of the mass and the angular momentum directly associated with the black hole. The isol... |
gr-qc/9905008 | hamid Reza Sepangi | F. Darabi and H. R. Sepangi | On Signature Transition and Compactification in Kaluza-Klein Cosmology | 13 pages, 3 figures | Class.Quant.Grav. 16 (1999) 1565-1575 | 10.1088/0264-9381/16/5/307 | null | gr-qc hep-th | null | We consider an empty (4+1) dimensional Kaluza-Klein universe with a negative
cosmological constant and a Robertson-Walker type metric. It is shown that the
solutions to Einstein field equations have degenerate metric and exhibit
transitioins from a Euclidean to a Lorentzian domain. We then suggest a
mechanism, based ... | [
{
"created": "Mon, 3 May 1999 14:21:59 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Darabi",
"F.",
""
],
[
"Sepangi",
"H. R.",
""
]
] | We consider an empty (4+1) dimensional Kaluza-Klein universe with a negative cosmological constant and a Robertson-Walker type metric. It is shown that the solutions to Einstein field equations have degenerate metric and exhibit transitioins from a Euclidean to a Lorentzian domain. We then suggest a mechanism, based on... |
1906.08640 | Luis Herrera | L. Herrera, A. Di Prisco and J. Carot | Complexity of the Bondi metric | 7 pages Revtex-4. Published in Phys.Rev. D. arXiv admin note: text
overlap with arXiv:gr-qc/0511112 | Phys. Rev. D99, 124028, (2019) | 10.1103/PhysRevD.99.124028 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recently introduced concept of complexity for relativistic fluids is
extended to the vacuum solutions represented by the Bondi metric. A complexity
hierarchy is established, ranging from the Minkowski spacetime (the simplest
one) to gravitationally radiating systems (the more complex). Particularly
interesting is t... | [
{
"created": "Wed, 19 Jun 2019 08:19:47 GMT",
"version": "v1"
}
] | 2019-07-17 | [
[
"Herrera",
"L.",
""
],
[
"Di Prisco",
"A.",
""
],
[
"Carot",
"J.",
""
]
] | A recently introduced concept of complexity for relativistic fluids is extended to the vacuum solutions represented by the Bondi metric. A complexity hierarchy is established, ranging from the Minkowski spacetime (the simplest one) to gravitationally radiating systems (the more complex). Particularly interesting is the... |
1509.04163 | Mariafelicia De Laurentis Professor | Salvatore Capozziello, Mariafelicia De Laurentis, Ruben Farinelli,
Sergei D. Odintsov | The Mass-Radius relation for Neutron Stars in $f(R)$ gravity | 10 pages, 6 figures, to appear in Phys. Rev. D | Phys. Rev. D 93, 023501 (2016) | 10.1103/PhysRevD.93.023501 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the Mass -Radius diagram for static neutron star models obtained
by the numerical solution of modified Tolman-Oppenheimer-Volkoff equations in
$f(R)$ gravity where the Lagrangians $f(R)=R+\alpha R^2 (1+\gamma R)$ and
$f(R)=R^{1+\epsilon }$ are adopted. Unlike the case of the perturbative
approach previousl... | [
{
"created": "Thu, 10 Sep 2015 23:55:40 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Sep 2015 19:24:10 GMT",
"version": "v2"
},
{
"created": "Mon, 30 Nov 2015 21:35:03 GMT",
"version": "v3"
}
] | 2016-01-13 | [
[
"Capozziello",
"Salvatore",
""
],
[
"De Laurentis",
"Mariafelicia",
""
],
[
"Farinelli",
"Ruben",
""
],
[
"Odintsov",
"Sergei D.",
""
]
] | We discuss the Mass -Radius diagram for static neutron star models obtained by the numerical solution of modified Tolman-Oppenheimer-Volkoff equations in $f(R)$ gravity where the Lagrangians $f(R)=R+\alpha R^2 (1+\gamma R)$ and $f(R)=R^{1+\epsilon }$ are adopted. Unlike the case of the perturbative approach previously ... |
2404.08375 | Lang Liu | Zu-Cheng Chen and Lang Liu | Detecting a Gravitational-Wave Background from Null Energy Condition
Violation: Prospects for Taiji | 23 pages, 5 figures. arXiv admin note: text overlap with
arXiv:2310.00411 | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The null energy condition (NEC) is a fundamental principle in general
relativity, and its violation could leave discernible signatures in
gravitational waves (GWs). A violation of the NEC during the primordial era
would imprint a blue-tilted spectrum on the stochastic gravitational wave
background (SGWB) at nanohertz... | [
{
"created": "Fri, 12 Apr 2024 10:20:29 GMT",
"version": "v1"
}
] | 2024-04-15 | [
[
"Chen",
"Zu-Cheng",
""
],
[
"Liu",
"Lang",
""
]
] | The null energy condition (NEC) is a fundamental principle in general relativity, and its violation could leave discernible signatures in gravitational waves (GWs). A violation of the NEC during the primordial era would imprint a blue-tilted spectrum on the stochastic gravitational wave background (SGWB) at nanohertz f... |
1004.0773 | Roberto A. Sussman | Roberto A. Sussman and German Izquierdo | A dynamical systems study of the inhomogeneous Lambda-CDM model | Final version published in Classical and Quantum Gravity: 26 pages in
IOP LaTeX macro style, 9 pdf figures | Class. Quant. Grav. 28:045006,2011;
Class.Quant.Grav.28:045006,2011 | 10.1088/0264-9381/28/4/045006 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider spherically symmetric inhomogeneous dust models with a positive
cosmological constant, $\Lambda$, given by the Lemaitre-Tolman-Bondi metric.
These configurations provide a simple but useful generalization of the
Lambda-CDM model describing cold dark matter (CDM) and a Lambda term, which
seems to fit curre... | [
{
"created": "Tue, 6 Apr 2010 05:15:13 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Feb 2011 00:55:56 GMT",
"version": "v2"
}
] | 2015-03-14 | [
[
"Sussman",
"Roberto A.",
""
],
[
"Izquierdo",
"German",
""
]
] | We consider spherically symmetric inhomogeneous dust models with a positive cosmological constant, $\Lambda$, given by the Lemaitre-Tolman-Bondi metric. These configurations provide a simple but useful generalization of the Lambda-CDM model describing cold dark matter (CDM) and a Lambda term, which seems to fit current... |
1708.04489 | Justin Feng | Justin C. Feng and Richard A. Matzner | The Weiss Variation of the Gravitational Action | 32 pages w/ 2 figures. Revised to match published version | Gen Relativ Gravit (2018) 50: 99 | 10.1007/s10714-018-2420-2 | UTTG-04-17 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Weiss variational principle in mechanics and classical field theory is a
variational principle which allows displacements of the boundary. We review the
Weiss variation in mechanics and classical field theory, and present a novel
geometric derivation of the Weiss variation for the gravitational action: the
Einste... | [
{
"created": "Mon, 14 Aug 2017 04:21:51 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Oct 2017 16:52:20 GMT",
"version": "v2"
},
{
"created": "Tue, 24 Jul 2018 14:53:41 GMT",
"version": "v3"
}
] | 2018-07-25 | [
[
"Feng",
"Justin C.",
""
],
[
"Matzner",
"Richard A.",
""
]
] | The Weiss variational principle in mechanics and classical field theory is a variational principle which allows displacements of the boundary. We review the Weiss variation in mechanics and classical field theory, and present a novel geometric derivation of the Weiss variation for the gravitational action: the Einstein... |
2305.11453 | Yu Shi | Dawei Wu, Ji-chong Yang, Yu Shi | Exact conditions for antiUnruh effect in (1+1)-dimensional spacetime | 16 pages | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Exact conditions for antiUnruh effect in (1+1)-dimensional spacetime are
obtained. For detectors with Gaussian switching functions, the analytic results
are similar to previous ones, indicating that antiUnruh effect occurs when the
energy gap matches the characteristic time scale. However, this conclusion does
not ho... | [
{
"created": "Fri, 19 May 2023 06:18:45 GMT",
"version": "v1"
}
] | 2023-05-22 | [
[
"Wu",
"Dawei",
""
],
[
"Yang",
"Ji-chong",
""
],
[
"Shi",
"Yu",
""
]
] | Exact conditions for antiUnruh effect in (1+1)-dimensional spacetime are obtained. For detectors with Gaussian switching functions, the analytic results are similar to previous ones, indicating that antiUnruh effect occurs when the energy gap matches the characteristic time scale. However, this conclusion does not hold... |
1711.01147 | Mohsen Fathi | Mohsen Fathi, Morteza Mohseni | Congruence Convergence in pp-wave Spacetime | 14 pages, 2 figures | Theor. Math. Phys. 195 (2), 729-744 (2018) | 10.1134/S0040577918050082 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that the well-known geodesic completeness property of pp-waves, can
be disregarded once the geodesics are extracted as being extended along sets of
Brinkmann coordinates. This issue is investigated in the more general context
of congruence convergence and we show that the problem leads to diverse issues
for ... | [
{
"created": "Thu, 2 Nov 2017 04:14:49 GMT",
"version": "v1"
},
{
"created": "Sun, 22 Apr 2018 05:33:59 GMT",
"version": "v2"
}
] | 2018-04-24 | [
[
"Fathi",
"Mohsen",
""
],
[
"Mohseni",
"Morteza",
""
]
] | We argue that the well-known geodesic completeness property of pp-waves, can be disregarded once the geodesics are extracted as being extended along sets of Brinkmann coordinates. This issue is investigated in the more general context of congruence convergence and we show that the problem leads to diverse issues for no... |
1204.2868 | Edward Anderson | Edward Anderson | Approaching the Problem of Time with a Combined
Semiclassical-Records-Histories Scheme | An improved version of the text, and with various further references.
25 pages, 4 figures | Class. Quantum Grav. 29 235015 (2012) | 10.1088/0264-9381/29/23/235015 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I approach the Problem of Time and other foundations of Quantum Cosmology
using a combined histories, timeless and semiclassical approach. This approach
is along the lines pursued by Halliwell. It involves the timeless probabilities
for dynamical trajectories entering regions of configuration space, which are
compute... | [
{
"created": "Fri, 13 Apr 2012 03:11:19 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Aug 2012 11:19:03 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Anderson",
"Edward",
""
]
] | I approach the Problem of Time and other foundations of Quantum Cosmology using a combined histories, timeless and semiclassical approach. This approach is along the lines pursued by Halliwell. It involves the timeless probabilities for dynamical trajectories entering regions of configuration space, which are computed ... |
1812.02136 | Iarley P. Lobo Dr | Iarley P. Lobo, Michele Ronco | Rainbow-like Black Hole metric from Loop Quantum Gravity | 29 pages | Universe 4 (2018), no.12, 139 | 10.3390/universe4120139 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The hypersurface deformation algebra consists in a fruitful approach to
derive deformed solutions of general relativity based on symmetry
considerations with quantum gravity effects, whose linearization has been
recently demonstrated to be connected to the DSR program by the
$\kappa$-Poincar\'e symmetry. Based on thi... | [
{
"created": "Wed, 5 Dec 2018 17:50:35 GMT",
"version": "v1"
}
] | 2018-12-06 | [
[
"Lobo",
"Iarley P.",
""
],
[
"Ronco",
"Michele",
""
]
] | The hypersurface deformation algebra consists in a fruitful approach to derive deformed solutions of general relativity based on symmetry considerations with quantum gravity effects, whose linearization has been recently demonstrated to be connected to the DSR program by the $\kappa$-Poincar\'e symmetry. Based on this ... |
gr-qc/0602037 | Joe Polchinski | Gary T. Horowitz and Joseph Polchinski | Gauge/gravity duality | To appear in "Towards quantum gravity", ed. Daniele Oriti, Cambridge
University Press. 20pgs; v2, v3: references updated | null | null | null | gr-qc hep-th | null | We review the emergence of gravity from gauge theory in the context of
AdS/CFT duality. We discuss the evidence for the duality, its lessons for
gravitational physics, generalizations, and open questions.
| [
{
"created": "Fri, 10 Feb 2006 02:03:56 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Mar 2006 05:27:19 GMT",
"version": "v2"
},
{
"created": "Tue, 18 Apr 2006 00:34:09 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Horowitz",
"Gary T.",
""
],
[
"Polchinski",
"Joseph",
""
]
] | We review the emergence of gravity from gauge theory in the context of AdS/CFT duality. We discuss the evidence for the duality, its lessons for gravitational physics, generalizations, and open questions. |
0709.0726 | Jan-Peter Boernsen | Jan-Peter Boernsen, Anton E. M. van de Ven | Inducing the Lovelock action | 11 pages, 3 figures | null | null | null | gr-qc hep-th | null | We re-analyze a possible ambiguity in the application of dimensional
regularization to Einstein-Gauss-Bonnet gravity, arising from the way one
treats the Gauss-Bonnet term. It is demonstrated that the addition of such a
term to the action gives rise to a non-minimal graviton wave operator, but does
not produce new on... | [
{
"created": "Wed, 5 Sep 2007 19:43:23 GMT",
"version": "v1"
}
] | 2011-11-10 | [
[
"Boernsen",
"Jan-Peter",
""
],
[
"van de Ven",
"Anton E. M.",
""
]
] | We re-analyze a possible ambiguity in the application of dimensional regularization to Einstein-Gauss-Bonnet gravity, arising from the way one treats the Gauss-Bonnet term. It is demonstrated that the addition of such a term to the action gives rise to a non-minimal graviton wave operator, but does not produce new on s... |
1305.7204 | Dibyendu Panigrahi DP | D. Panigrahi, B. C. Paul and S. Chatterjee | Constraining Modified Chaplygin gas parameters | 15 pages, 9 figures | Gravitation and Cosmology, 2015, Vol. 21, pp. 83 | 10.1134/S0202289315010119 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the evolution of a FRW model fuelled by a modified Chaplygin
gas with an equation of state $p = A\rho -\frac{B}{\rho^\alpha}$. An attempt is
made here to constrain the free parameters of MCG model through the wellknown
contour plot technique using observational data. The permissible range of
values of ... | [
{
"created": "Thu, 30 May 2013 18:54:31 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Jul 2014 20:04:42 GMT",
"version": "v2"
}
] | 2015-10-23 | [
[
"Panigrahi",
"D.",
""
],
[
"Paul",
"B. C.",
""
],
[
"Chatterjee",
"S.",
""
]
] | We investigate the evolution of a FRW model fuelled by a modified Chaplygin gas with an equation of state $p = A\rho -\frac{B}{\rho^\alpha}$. An attempt is made here to constrain the free parameters of MCG model through the wellknown contour plot technique using observational data. The permissible range of values of th... |
gr-qc/0208090 | Olivier Sarbach | Claudia Moreno, Olivier Sarbach | Stability properties of black holes in self-gravitating nonlinear
electrodynamics | 15 pages, no figures | Phys.Rev. D67 (2003) 024028 | 10.1103/PhysRevD.67.024028 | null | gr-qc | null | We analyze the dynamical stability of black hole solutions in
self-gravitating nonlinear electrodynamics with respect to arbitrary linear
fluctuations of the metric and the electromagnetic field. In particular, we
derive simple conditions on the electromagnetic Lagrangian which imply linear
stability in the domain of... | [
{
"created": "Thu, 29 Aug 2002 18:41:38 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Moreno",
"Claudia",
""
],
[
"Sarbach",
"Olivier",
""
]
] | We analyze the dynamical stability of black hole solutions in self-gravitating nonlinear electrodynamics with respect to arbitrary linear fluctuations of the metric and the electromagnetic field. In particular, we derive simple conditions on the electromagnetic Lagrangian which imply linear stability in the domain of o... |
1509.07354 | Szilvia Karsai | Gergely G\'abor Barnaf\"oldi, Szilvia Karsai, B\'ela Luk\'acs, and
P\'eter P\'osfay | Testing a Possible Way of Geometrization of the Strong Interaction by a
Kaluza-Klein Star | 10 pages, 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Geometrization of the fundamental interactions has been extensively studied
during the century. The idea of introducing compactified spatial dimensions
originated by Kaluza and Klein. Following their approach, several model were
built representing quantum numbers (e.g. charges) as compactified space-time
dimensions. ... | [
{
"created": "Thu, 10 Sep 2015 09:25:10 GMT",
"version": "v1"
}
] | 2015-09-25 | [
[
"Barnaföldi",
"Gergely Gábor",
""
],
[
"Karsai",
"Szilvia",
""
],
[
"Lukács",
"Béla",
""
],
[
"Pósfay",
"Péter",
""
]
] | Geometrization of the fundamental interactions has been extensively studied during the century. The idea of introducing compactified spatial dimensions originated by Kaluza and Klein. Following their approach, several model were built representing quantum numbers (e.g. charges) as compactified space-time dimensions. Su... |
2407.09602 | Maximilian Dax | Maximilian Dax, Stephen R. Green, Jonathan Gair, Nihar Gupte, Michael
P\"urrer, Vivien Raymond, Jonas Wildberger, Jakob H. Macke, Alessandra
Buonanno, Bernhard Sch\"olkopf | Real-time gravitational-wave inference for binary neutron stars using
machine learning | 8+8 pages, 3+7 figures | null | null | LIGO-P2400294 | gr-qc astro-ph.IM cs.LG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Mergers of binary neutron stars (BNSs) emit signals in both the
gravitational-wave (GW) and electromagnetic (EM) spectra. Famously, the 2017
multi-messenger observation of GW170817 led to scientific discoveries across
cosmology, nuclear physics, and gravity. Central to these results were the sky
localization and dist... | [
{
"created": "Fri, 12 Jul 2024 18:00:02 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Aug 2024 13:00:54 GMT",
"version": "v2"
}
] | 2024-08-05 | [
[
"Dax",
"Maximilian",
""
],
[
"Green",
"Stephen R.",
""
],
[
"Gair",
"Jonathan",
""
],
[
"Gupte",
"Nihar",
""
],
[
"Pürrer",
"Michael",
""
],
[
"Raymond",
"Vivien",
""
],
[
"Wildberger",
"Jonas",
""
],
[... | Mergers of binary neutron stars (BNSs) emit signals in both the gravitational-wave (GW) and electromagnetic (EM) spectra. Famously, the 2017 multi-messenger observation of GW170817 led to scientific discoveries across cosmology, nuclear physics, and gravity. Central to these results were the sky localization and distan... |
2010.12194 | Ming Zhang | Ming Zhang and Jie Jiang | Shadows of the accelerating black holes | 7 pages, 5 captioned figures | Phys. Rev. D 103, 025005 (2021) | 10.1103/PhysRevD.103.025005 | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | Due to the acceleration of the black hole, the circular orbits of the photons
will deviate from the equatorial plane and the property of the black hole
shadow will change. We find that the latitude of the circular orbit increases
with the increasing acceleration and then show that the observer's inclination
angles wh... | [
{
"created": "Fri, 23 Oct 2020 06:52:56 GMT",
"version": "v1"
}
] | 2021-01-20 | [
[
"Zhang",
"Ming",
""
],
[
"Jiang",
"Jie",
""
]
] | Due to the acceleration of the black hole, the circular orbits of the photons will deviate from the equatorial plane and the property of the black hole shadow will change. We find that the latitude of the circular orbit increases with the increasing acceleration and then show that the observer's inclination angles whic... |
gr-qc/0105019 | Anzhong Wang | C.F.C. Brandt, L.-M. Lin, J.F. Villas da Rocha and A.Z. Wang | Gravitational collapse of spherically symmetric perfect fluid with
kinematic self-similarity | Revtex, 12 figures | Int.J.Mod.Phys. D11 (2002) 155-186 | 10.1142/S0218271802001500 | null | gr-qc | null | Analytic spherically symmetric solutions of the Einstein field equations
coupled with a perfect fluid and with self-similarities of the zeroth, first
and second kinds, found recently by Benoit and Coley [Class. Quantum Grav. {\bf
15}, 2397 (1998)], are studied, and found that some of them represent
gravitational coll... | [
{
"created": "Fri, 4 May 2001 17:13:55 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Brandt",
"C. F. C.",
""
],
[
"Lin",
"L. -M.",
""
],
[
"da Rocha",
"J. F. Villas",
""
],
[
"Wang",
"A. Z.",
""
]
] | Analytic spherically symmetric solutions of the Einstein field equations coupled with a perfect fluid and with self-similarities of the zeroth, first and second kinds, found recently by Benoit and Coley [Class. Quantum Grav. {\bf 15}, 2397 (1998)], are studied, and found that some of them represent gravitational collap... |
2405.03623 | Fernando Carneiro | F. L. Carneiro, S. C. Ulhoa and M. P. Lobo | On Reference Frames and Coordinate Transformations | 12 pages, 1 figure. A new reference has been added | Rev. Bras. Ensino Fis. v.46, p.e20240043, 2024 | 10.1590/1806-9126-RBEF-2024-0043 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | This article explores the differences between frame and coordinate
transformations in relativistic theories. We highlight the key role of tetrad
fields in connecting spacetime and frame indices. Using Maxwell's
electrodynamics as an example, we show that Maxwell's equations are invariant
under coordinate transformati... | [
{
"created": "Mon, 6 May 2024 16:41:13 GMT",
"version": "v1"
},
{
"created": "Tue, 14 May 2024 16:03:31 GMT",
"version": "v2"
}
] | 2024-05-15 | [
[
"Carneiro",
"F. L.",
""
],
[
"Ulhoa",
"S. C.",
""
],
[
"Lobo",
"M. P.",
""
]
] | This article explores the differences between frame and coordinate transformations in relativistic theories. We highlight the key role of tetrad fields in connecting spacetime and frame indices. Using Maxwell's electrodynamics as an example, we show that Maxwell's equations are invariant under coordinate transformation... |
0807.0069 | Chih-Hung Wang | Chih-Hung Wang, Yu-Huei Wu | Inflation in $R + R^2$ Gravity with Torsion | 9 pages, LaTex; v2: separated into five sections, added more content
in Introduction and Conclusion, abstract and section 2 improved; v3: three
typos are corrected | Class.Quant.Grav.26:045016,2009 | 10.1088/0264-9381/26/4/045016 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/3.0/ | We examine an inflationary model in $R + R^2$ gravity with torsion, where
$R^2$ denotes five independent quadratic curvature invariants; it turns out
that only two free parameters remain in this model. We show that the behavior
of the scale factor $a(t)$ is determined by two scalar fields, axial torsion
$\chi(t)$ and... | [
{
"created": "Tue, 1 Jul 2008 05:36:19 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Dec 2008 13:59:00 GMT",
"version": "v2"
},
{
"created": "Fri, 6 Feb 2009 08:51:40 GMT",
"version": "v3"
}
] | 2009-02-12 | [
[
"Wang",
"Chih-Hung",
""
],
[
"Wu",
"Yu-Huei",
""
]
] | We examine an inflationary model in $R + R^2$ gravity with torsion, where $R^2$ denotes five independent quadratic curvature invariants; it turns out that only two free parameters remain in this model. We show that the behavior of the scale factor $a(t)$ is determined by two scalar fields, axial torsion $\chi(t)$ and t... |
1303.6056 | Tetsuya Shiromizu | Tetsuya Shiromizu, Kentaro Tanabe | Static spacetimes with/without black holes in dynamical Chern-Simons
gravity | 3 pages | null | 10.1103/PhysRevD.87.081504 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the static and asymptotically flat black hole spacetime is
unique to be Schwarzschild spacetime in the dynamical Chern-Simons gravity. In
addition, we show that the strictly static spacetimes should be the Minkowski
spacetime.
| [
{
"created": "Mon, 25 Mar 2013 09:13:17 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Shiromizu",
"Tetsuya",
""
],
[
"Tanabe",
"Kentaro",
""
]
] | We show that the static and asymptotically flat black hole spacetime is unique to be Schwarzschild spacetime in the dynamical Chern-Simons gravity. In addition, we show that the strictly static spacetimes should be the Minkowski spacetime. |
1201.2379 | Ilia Musco | Ilia Musco and John C. Miller | Primordial black hole formation in the early universe: critical
behaviour and self-similarity | 23 pages, 8 figures, new abstract, submitted to Classical and Quantum
Gravity. This new version of the paper has been completely rewritten with
respect the previous one, with several changes and substantial additional
work | Class. Quantum Grav. 30 145009 (2013) | 10.1088/0264-9381/30/14/145009 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Following on after three previous papers discussing the formation of
primordial black holes during the radiative era of the early universe, we
present here a further investigation of the critical nature of the process
involved, aimed at making contact with some of the basic underlying ideas from
the literature on cri... | [
{
"created": "Wed, 11 Jan 2012 19:03:42 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Apr 2013 16:48:15 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Apr 2013 19:25:38 GMT",
"version": "v3"
}
] | 2013-12-11 | [
[
"Musco",
"Ilia",
""
],
[
"Miller",
"John C.",
""
]
] | Following on after three previous papers discussing the formation of primordial black holes during the radiative era of the early universe, we present here a further investigation of the critical nature of the process involved, aimed at making contact with some of the basic underlying ideas from the literature on criti... |
1001.5129 | Tanwi Ghosh | Tanwi Ghosh and Soumitra Sengupta | Strong gravitational lensing across dilaton anti-de Sitter black hole | 8 pages and 3 figures. Accepted in Physical Review D | Phys.Rev.D81:044013,2010 | 10.1103/PhysRevD.81.044013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we investigate gravitational lensing effect in strong field
region around a dilaton black holes in an anti de Sitter (ADS) space. We also
analyse the dependence of the radius of the photon sphere and deflection angle
on dilaton coupling and cosmological constant in this black hole space time.
Finally the... | [
{
"created": "Thu, 28 Jan 2010 08:57:06 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Feb 2010 06:02:49 GMT",
"version": "v2"
}
] | 2010-04-14 | [
[
"Ghosh",
"Tanwi",
""
],
[
"Sengupta",
"Soumitra",
""
]
] | In this work we investigate gravitational lensing effect in strong field region around a dilaton black holes in an anti de Sitter (ADS) space. We also analyse the dependence of the radius of the photon sphere and deflection angle on dilaton coupling and cosmological constant in this black hole space time. Finally the v... |
2011.00816 | Tao Zhang | Tao Zhang, Fu-Wen Shu, Qing-Wen Tang and Dong-Hui Du | Constraints on Ho\v{r}ava-Lifshitz gravity from GRB 170817A | 21 pages, 2 tables. Accepted for publication in EPJC | Eur. Phys. J. C 80, 1062 (2020) | 10.1140/epjc/s10052-020-08626-z | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we focus on a toy model: (3+1)-dimensional Ho\v{r}ava-Lifshitz
gravity coupling with an anisotropic electromagnetic (EM) field which is
generated through a Kaluza-Klein reduction of a (4+1)-dimensional
Ho\v{r}ava-Lifshitz gravity. This model exhibits a remarkable feature that it
has the same velocity for... | [
{
"created": "Mon, 2 Nov 2020 08:35:40 GMT",
"version": "v1"
}
] | 2020-11-24 | [
[
"Zhang",
"Tao",
""
],
[
"Shu",
"Fu-Wen",
""
],
[
"Tang",
"Qing-Wen",
""
],
[
"Du",
"Dong-Hui",
""
]
] | In this work we focus on a toy model: (3+1)-dimensional Ho\v{r}ava-Lifshitz gravity coupling with an anisotropic electromagnetic (EM) field which is generated through a Kaluza-Klein reduction of a (4+1)-dimensional Ho\v{r}ava-Lifshitz gravity. This model exhibits a remarkable feature that it has the same velocity for b... |
2109.08748 | Maxence Corman | Maxence Corman, Abhirup Ghosh, Celia Escamilla-Rivera, Martin
A.Hendry, Sylvain Marsat and Nicola Tamanini | Constraining cosmological extra dimensions with gravitational wave
standard sirens: from theory to current and future multi-messenger
observations | 20 pages, 3 figures | null | 10.1103/PhysRevD.105.064061 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The propagation of gravitational waves (GWs) at cosmological distances offers
a new way to test the gravitational interaction at the largest scales. Many
modified theories of gravity, usually introduced to explain the observed
acceleration of the universe, can be probed in an alternative and complementary
manner with... | [
{
"created": "Fri, 17 Sep 2021 20:07:43 GMT",
"version": "v1"
}
] | 2022-04-13 | [
[
"Corman",
"Maxence",
""
],
[
"Ghosh",
"Abhirup",
""
],
[
"Escamilla-Rivera",
"Celia",
""
],
[
"Hendry",
"Martin A.",
""
],
[
"Marsat",
"Sylvain",
""
],
[
"Tamanini",
"Nicola",
""
]
] | The propagation of gravitational waves (GWs) at cosmological distances offers a new way to test the gravitational interaction at the largest scales. Many modified theories of gravity, usually introduced to explain the observed acceleration of the universe, can be probed in an alternative and complementary manner with r... |
1711.05138 | Manuel Kraemer | Jo\~ao Morais, Mariam Bouhmadi-L\'opez, Manuel Kraemer, Salvador
Robles-P\'erez | Pre-inflation from the multiverse: Can it solve the quadrupole problem
in the cosmic microwave background? | 15 pages, 9 figures. Correction of typos, one figure added. Accepted
for publication in European Physical Journal C | Eur. Phys. J. C (2018) 78: 240 | 10.1140/epjc/s10052-018-5698-z | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze a quantized toy model of a universe undergoing eternal inflation
using a quantum-field-theoretical formulation of the Wheeler-DeWitt equation.
This so-called third quantization method leads to the picture that the
eternally inflating universe is converted to a multiverse in which
sub-universes are created ... | [
{
"created": "Tue, 14 Nov 2017 15:16:29 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Mar 2018 18:48:31 GMT",
"version": "v2"
}
] | 2018-03-22 | [
[
"Morais",
"João",
""
],
[
"Bouhmadi-López",
"Mariam",
""
],
[
"Kraemer",
"Manuel",
""
],
[
"Robles-Pérez",
"Salvador",
""
]
] | We analyze a quantized toy model of a universe undergoing eternal inflation using a quantum-field-theoretical formulation of the Wheeler-DeWitt equation. This so-called third quantization method leads to the picture that the eternally inflating universe is converted to a multiverse in which sub-universes are created an... |
1005.3001 | Gerry McKeon | D.G.C. McKeon | The Canonical Structure of the First Order Einstein-Hilbert Action | null | Int.J.Mod.Phys.A25:3453-3480,2010 | 10.1142/S0217751X10050093 | null | gr-qc hep-th | http://creativecommons.org/licenses/publicdomain/ | The Dirac constraint formalism is used to analyze the first order form of the
Einstein-Hilbert action in d > 2 dimensions. Unlike previous treatments, this
is done without eliminating fields at the outset by solving equations of motion
that are independent of time derivatives when they correspond to first class
const... | [
{
"created": "Mon, 17 May 2010 19:15:14 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"McKeon",
"D. G. C.",
""
]
] | The Dirac constraint formalism is used to analyze the first order form of the Einstein-Hilbert action in d > 2 dimensions. Unlike previous treatments, this is done without eliminating fields at the outset by solving equations of motion that are independent of time derivatives when they correspond to first class constra... |
1706.08779 | Kofinas Georgios | Georgios Kofinas, Vasilios Zarikas | A solution of the dark energy and its coincidence problem based on local
antigravity sources without fine-tuning or new scales | 34 pages, 2 figures, version to app. in Phys. Rev. D | Phys. Rev. D 97, 123542 (2018) | 10.1103/PhysRevD.97.123542 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A novel idea is proposed for a natural solution of the dark energy and its
cosmic coincidence problem. The existence of local antigravity sources,
associated with astrophysical matter configurations distributed throughout the
universe, can lead to a recent cosmic acceleration effect. Various physical
theories can be ... | [
{
"created": "Tue, 27 Jun 2017 11:07:46 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Jun 2018 08:00:59 GMT",
"version": "v2"
}
] | 2018-07-04 | [
[
"Kofinas",
"Georgios",
""
],
[
"Zarikas",
"Vasilios",
""
]
] | A novel idea is proposed for a natural solution of the dark energy and its cosmic coincidence problem. The existence of local antigravity sources, associated with astrophysical matter configurations distributed throughout the universe, can lead to a recent cosmic acceleration effect. Various physical theories can be co... |
2211.00314 | Shoki Iwaguchi | Shoki Iwaguchi, Atsushi Nishizawa, Yanbei Chen, Yuki Kawasaki,
Tomohiro Ishikawa, Masaaki Kitaguchi, Yutaka Yamagata, Bin Wu, Ryuma Shimizu,
Kurumi Umemura, Kenji Tsuji, Hirohiko Shimizu, Yuta Michimura, and Seiji
Kawamura | Displacement-noise-free interferometeric gravitational-wave detector
using unidirectional neutrons with four speeds | null | null | 10.1016/j.physleta.2022.128581 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For further gravitational wave (GW) detections, it is significant to invent a
technique to reduce all kinds of mirror displacement noise dominant at low
frequencies for ground-based detectors. The neutron displacement-noise-free
interferometer (DFI) is one of the tools to reduce all the mirror displacement
noise at l... | [
{
"created": "Tue, 1 Nov 2022 07:47:56 GMT",
"version": "v1"
}
] | 2022-12-28 | [
[
"Iwaguchi",
"Shoki",
""
],
[
"Nishizawa",
"Atsushi",
""
],
[
"Chen",
"Yanbei",
""
],
[
"Kawasaki",
"Yuki",
""
],
[
"Ishikawa",
"Tomohiro",
""
],
[
"Kitaguchi",
"Masaaki",
""
],
[
"Yamagata",
"Yutaka",
""
... | For further gravitational wave (GW) detections, it is significant to invent a technique to reduce all kinds of mirror displacement noise dominant at low frequencies for ground-based detectors. The neutron displacement-noise-free interferometer (DFI) is one of the tools to reduce all the mirror displacement noise at low... |
2403.08661 | Francesco Becattini | F. Becattini, D. Roselli (University of Florence and INFN) | Negative pressure as a quantum effect in free-streaming in the
cosmological background | 28 pages, 15 figures | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a study of energy density and pressure of a free real scalar
quantum field after its decoupling from a thermal bath in the spatially flat
Friedman-Lemaitre-Robertson-Walker space-time by solving the Klein-Gordon
equation both analytically and numerically for different predetermined scale
factor functions $... | [
{
"created": "Wed, 13 Mar 2024 16:15:20 GMT",
"version": "v1"
}
] | 2024-03-14 | [
[
"Becattini",
"F.",
"",
"University of Florence and INFN"
],
[
"Roselli",
"D.",
"",
"University of Florence and INFN"
]
] | We present a study of energy density and pressure of a free real scalar quantum field after its decoupling from a thermal bath in the spatially flat Friedman-Lemaitre-Robertson-Walker space-time by solving the Klein-Gordon equation both analytically and numerically for different predetermined scale factor functions $a(... |
2405.15499 | Jose Wadih Maluf Dr. | J. W. Maluf, F. Lessa Carneiro, S. C. Ulhoa and J. F. da Rocha-Neto | Energy of Gravitational Radiation and the Background Energy of the
Space-Time | 24 pages, 12 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We address the issue of gravitational radiation in the context of the
Bondi-Sachs space-time, and consider the expression for the gravitational
energy of the radiation obtained in the realm of the teleparallel equivalent of
general relativity (TEGR). This expression is independent of the radial
distance (i.e., of pow... | [
{
"created": "Fri, 24 May 2024 12:38:49 GMT",
"version": "v1"
}
] | 2024-05-27 | [
[
"Maluf",
"J. W.",
""
],
[
"Carneiro",
"F. Lessa",
""
],
[
"Ulhoa",
"S. C.",
""
],
[
"da Rocha-Neto",
"J. F.",
""
]
] | We address the issue of gravitational radiation in the context of the Bondi-Sachs space-time, and consider the expression for the gravitational energy of the radiation obtained in the realm of the teleparallel equivalent of general relativity (TEGR). This expression is independent of the radial distance (i.e., of power... |
2402.02294 | Zhongmin Qian | Zhongmin Qian | Dirac operators and field equations of the gravitational field and
matter fields | 17 pages | null | null | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | Dirac operators on curved space-times are introduced with the help of a new
point-view that observers have to be included in the formulation of natural
laws. The class of Dirac operators are Lorentz invariant in the sense that the
transformation rule is specified under diffeomorphisms of the space-time which
preserve... | [
{
"created": "Sat, 3 Feb 2024 23:17:02 GMT",
"version": "v1"
}
] | 2024-02-06 | [
[
"Qian",
"Zhongmin",
""
]
] | Dirac operators on curved space-times are introduced with the help of a new point-view that observers have to be included in the formulation of natural laws. The class of Dirac operators are Lorentz invariant in the sense that the transformation rule is specified under diffeomorphisms of the space-time which preserve t... |
gr-qc/0011040 | Gyula Fodor | Gyula Fodor | Generating spherically symmetric static perfect fluid solutions | 17 pages | null | null | null | gr-qc | null | By a choice of new variables the pressure isotropy condition for spherically
symmetric static perfect fluid spacetimes can be made a quadratic algebraic
equation in one of the two functions appearing in it. Using the other variable
as a generating function, the pressure and the density of the fluid can be
expressed a... | [
{
"created": "Sun, 12 Nov 2000 05:36:26 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Fodor",
"Gyula",
""
]
] | By a choice of new variables the pressure isotropy condition for spherically symmetric static perfect fluid spacetimes can be made a quadratic algebraic equation in one of the two functions appearing in it. Using the other variable as a generating function, the pressure and the density of the fluid can be expressed alg... |
gr-qc/0206083 | Charles Torre | C. G. Torre | Quantum Dynamics of the Polarized Gowdy Model | 24 pages, some typos corrected | Phys.Rev.D66:084017,2002 | 10.1103/PhysRevD.66.084017 | null | gr-qc hep-th math-ph math.MP | null | The polarized Gowdy ${\bf T}^3$ vacuum spacetimes are characterized, modulo
gauge, by a ``point particle'' degree of freedom and a function $\phi$ that
satisfies a linear field equation and a non-linear constraint. The quantum
Gowdy model has been defined by using a representation for $\phi$ on a Fock
space $\cal F$.... | [
{
"created": "Thu, 27 Jun 2002 17:30:50 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Jun 2002 17:15:11 GMT",
"version": "v2"
}
] | 2009-02-24 | [
[
"Torre",
"C. G.",
""
]
] | The polarized Gowdy ${\bf T}^3$ vacuum spacetimes are characterized, modulo gauge, by a ``point particle'' degree of freedom and a function $\phi$ that satisfies a linear field equation and a non-linear constraint. The quantum Gowdy model has been defined by using a representation for $\phi$ on a Fock space $\cal F$. U... |
gr-qc/9409003 | Mike Cassidy | M.J.Cassidy | Nonlinearity in Quantum Theory and Closed Timelike Curves | 17 pages plain TeX, DAMTP R/94/34 | Phys.Rev. D52 (1995) 5676-5680 | 10.1103/PhysRevD.52.5676 | null | gr-qc hep-th | null | We examine consequences of the density matrix approach to quantum theory in
the context of a model spacetime containing closed timelike curves and find
that in general, an initially pure state will evolve in a nonlinear way to a
mixed quantum state. CPT invariance and the implications of this nonlinearity
for the sta... | [
{
"created": "Fri, 2 Sep 1994 14:46:30 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Sep 1994 16:46:00 GMT",
"version": "v2"
}
] | 2009-10-22 | [
[
"Cassidy",
"M. J.",
""
]
] | We examine consequences of the density matrix approach to quantum theory in the context of a model spacetime containing closed timelike curves and find that in general, an initially pure state will evolve in a nonlinear way to a mixed quantum state. CPT invariance and the implications of this nonlinearity for the stati... |
1904.00270 | Mohammad Nouri-Zonoz | A. Besharat, M. Miri and M. Nouri-Zonoz | Optical Aharonov-Bohm effect due to toroidal moment inspired by general
relativity | 18 pages, Replaced with the published version | J. Phys. Commun. 3 (2019) 115019 | 10.1088/2399-6528/ab582a | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the analogy between propagation of light rays in a stationary curved
spacetime and in a toroidal (meta-)material. After introducing a novel
gravitational analog of the index of refraction of a magneto-electric medium,
it is argued that light rays not only feel a Lorentz-like force in a
magneto-electric mediu... | [
{
"created": "Sat, 30 Mar 2019 19:02:27 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Apr 2019 07:07:51 GMT",
"version": "v2"
},
{
"created": "Wed, 6 May 2020 22:13:31 GMT",
"version": "v3"
}
] | 2020-05-08 | [
[
"Besharat",
"A.",
""
],
[
"Miri",
"M.",
""
],
[
"Nouri-Zonoz",
"M.",
""
]
] | We study the analogy between propagation of light rays in a stationary curved spacetime and in a toroidal (meta-)material. After introducing a novel gravitational analog of the index of refraction of a magneto-electric medium, it is argued that light rays not only feel a Lorentz-like force in a magneto-electric medium ... |
2209.05475 | Gonzalo Morras | Gonzalo Morras, Jose Francisco Nu\~no Siles, Juan Garcia-Bellido,
Ester Ruiz Morales | The False Alarms induced by Gaussian Noise in Gravitational Wave
Detectors | 22 pages, 11 figures | Phys. Rev. D 107, 023027 (2023) | 10.1103/PhysRevD.107.023027 | IFT-UAM/CSIC-22-105 | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gaussian noise is an irreducible component of the background in gravitational
wave (GW) detectors. Although stationary Gaussian noise is uncorrelated in
frequencies, we show that there is an important correlation in time when
looking at the matched filter signal to noise ratio (SNR) of a template, with a
typical auto... | [
{
"created": "Mon, 12 Sep 2022 17:59:03 GMT",
"version": "v1"
}
] | 2023-02-01 | [
[
"Morras",
"Gonzalo",
""
],
[
"Siles",
"Jose Francisco Nuño",
""
],
[
"Garcia-Bellido",
"Juan",
""
],
[
"Morales",
"Ester Ruiz",
""
]
] | Gaussian noise is an irreducible component of the background in gravitational wave (GW) detectors. Although stationary Gaussian noise is uncorrelated in frequencies, we show that there is an important correlation in time when looking at the matched filter signal to noise ratio (SNR) of a template, with a typical autoco... |
2010.10674 | Mart\'in G. Richarte MR | J\'ulio C. Fabris, Mart\'in G. Richarte, Alberto Saa | Quasinormal modes and self-adjoint extensions of the Schroedinger
operator | & pages, 1 Figure. Accepted for its publication in Physical Review D | Phys. Rev. D 103, 045001 (2021) | 10.1103/PhysRevD.103.045001 | null | gr-qc hep-th math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit here the analytical continuation approach usually employed to
compute quasinormal modes (QNM) and frequencies of a given potential barrier
$V$ starting from the bounded states and respective eigenvalues of the
Schroedinger operator associated with the potential well corresponding to the
inverted potential ... | [
{
"created": "Tue, 20 Oct 2020 23:53:44 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Jan 2021 18:03:37 GMT",
"version": "v2"
}
] | 2021-02-09 | [
[
"Fabris",
"Júlio C.",
""
],
[
"Richarte",
"Martín G.",
""
],
[
"Saa",
"Alberto",
""
]
] | We revisit here the analytical continuation approach usually employed to compute quasinormal modes (QNM) and frequencies of a given potential barrier $V$ starting from the bounded states and respective eigenvalues of the Schroedinger operator associated with the potential well corresponding to the inverted potential $-... |
gr-qc/0601138 | Juan Antonio Morales Lladosa | Juan Antonio Morales Lladosa | Coordinates and frames from the causal point of view | 5 pages, 1 figure, short communication in A Century of Relativity
Physics, Proceedings of the XXVIII Spanish Relativity Meeting ERE-2006, 6-10
September - Oviedo - Spain (AIP Conference Proceedings) | null | 10.1063/1.2218231 | null | gr-qc | null | Lorentzian frames may belong to one of the 199 causal classes. Of these
numerous causal classes, people are essentially aware only of two of them.
Nevertheless, other causal classes are present in some well-known solutions, or
present a strong interest in the physical construction of coordinate systems.
Here we show ... | [
{
"created": "Tue, 31 Jan 2006 16:32:14 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Lladosa",
"Juan Antonio Morales",
""
]
] | Lorentzian frames may belong to one of the 199 causal classes. Of these numerous causal classes, people are essentially aware only of two of them. Nevertheless, other causal classes are present in some well-known solutions, or present a strong interest in the physical construction of coordinate systems. Here we show th... |
gr-qc/9308001 | Jorge Pullin | Octavio Obregon, Jorge Pullin and Michael P. Ryan | Bianchi Cosmologies: New Variables and a Hidden Supersymmetry | 15 Pages, RevTex, NSF-ITP-93-90 | Phys.Rev. D48 (1993) 5642-5647 | 10.1103/PhysRevD.48.5642 | null | gr-qc | null | We find a supersymmetrization of the Bianchi IX cosmology in terms of
Ashtekar's new variables. This provides a framework for connecting the recent
results of Graham and those of Ryan and Moncrief for quantum states of this
model. These states are also related with the states obtained particularizing
supergravity for... | [
{
"created": "Wed, 4 Aug 1993 14:41:52 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Obregon",
"Octavio",
""
],
[
"Pullin",
"Jorge",
""
],
[
"Ryan",
"Michael P.",
""
]
] | We find a supersymmetrization of the Bianchi IX cosmology in terms of Ashtekar's new variables. This provides a framework for connecting the recent results of Graham and those of Ryan and Moncrief for quantum states of this model. These states are also related with the states obtained particularizing supergravity for a... |
gr-qc/9805009 | Claus Laemmerzahl | Claus L\"ammerzahl | Quantum Tests of the Foundations of General Relativity | Classical and Quantum Gravity 15, 13 (1998) | null | 10.1088/0264-9381/15/1/003 | null | gr-qc | null | The role of the equivalence principle in the context of non-relativistic
quantum mechanics and matter wave interferometry, especially atom beam
interferometry, will be discussed. A generalised form of the weak equivalence
principle which is capable of covering quantum phenomena too, will be proposed.
It is shown that... | [
{
"created": "Tue, 5 May 1998 09:50:36 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Lämmerzahl",
"Claus",
""
]
] | The role of the equivalence principle in the context of non-relativistic quantum mechanics and matter wave interferometry, especially atom beam interferometry, will be discussed. A generalised form of the weak equivalence principle which is capable of covering quantum phenomena too, will be proposed. It is shown that t... |
gr-qc/0512125 | David Delphenich | David Delphenich | Projective geometry and special relativity | 41 pages, 4 figures. Annalen der Physik (Leipzig) (2006), to be
published | Annalen Phys. 15 (2006) 216-246 | 10.1002/andp.200510179 | null | gr-qc | null | Some concepts of real and complex projective geometry are applied to the
fundamental physical notions that relate to Minkowski space and the Lorentz
group. In particular, it is shown that the transition from an infinite speed of
propagation for light waves to a finite one entails the replacement of a
hyperplane at in... | [
{
"created": "Thu, 22 Dec 2005 00:40:29 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Delphenich",
"David",
""
]
] | Some concepts of real and complex projective geometry are applied to the fundamental physical notions that relate to Minkowski space and the Lorentz group. In particular, it is shown that the transition from an infinite speed of propagation for light waves to a finite one entails the replacement of a hyperplane at infi... |
2012.09193 | Sebasti\'an Bahamonde Dr | Sebastian Bahamonde, Jorge Gigante Valcarcel, Laur J\"arv, Christian
Pfeifer | Exploring Axial Symmetry in Modified Teleparallel Gravity | 26 pages, 1 figure. Matches published version in PRD | Phys. Rev. D 103, 044058 (2021) | 10.1103/PhysRevD.103.044058 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Axially symmetric spacetimes play an important role in the relativistic
description of rotating astrophysical objects like black holes, stars, etc. In
gravitational theories that venture beyond the usual Riemannian geometry by
allowing independent connection components, the notion of symmetry concerns,
not just the m... | [
{
"created": "Wed, 16 Dec 2020 19:00:04 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Feb 2021 17:40:39 GMT",
"version": "v2"
}
] | 2021-02-26 | [
[
"Bahamonde",
"Sebastian",
""
],
[
"Valcarcel",
"Jorge Gigante",
""
],
[
"Järv",
"Laur",
""
],
[
"Pfeifer",
"Christian",
""
]
] | Axially symmetric spacetimes play an important role in the relativistic description of rotating astrophysical objects like black holes, stars, etc. In gravitational theories that venture beyond the usual Riemannian geometry by allowing independent connection components, the notion of symmetry concerns, not just the met... |
2212.13832 | Yeinzon Rodriguez Garcia | Jhan N. Martinez (1), Jose F. Rodriguez (1,2), Yeinzon Rodriguez
(1,3), Gabriel Gomez (4) ((1) Universidad Industrial de Santander, (2)
ICRANet, (3) Universidad Antonio Narino, (4) Universidad de Santiago de
Chile) | Particle-like solutions in the generalized SU(2) Proca theory | LaTeX file in RevTeX 4.1 style, 21 pages, 13 figures. v2: Minor
clarifications added. Conclusions unchanged. v3: Some other clarifications,
an appendix, and two figures added. Conclusions unchanged. Version published
in Journal of Cosmology and Astroparticle Physics | JCAP 2304: 032, 2023 | 10.1088/1475-7516/2023/04/032 | PI/UAN-2023-723FT | gr-qc astro-ph.SR hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The generalized SU(2) Proca theory is a vector-tensor modified gravity theory
where the action is invariant under both diffeomorphisms and global internal
transformations of the SU(2) group. This work constitutes the first approach to
investigate the physical properties of the theory at astrophysical scales. We
have ... | [
{
"created": "Wed, 28 Dec 2022 14:34:00 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jan 2023 22:37:45 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Apr 2023 14:37:30 GMT",
"version": "v3"
}
] | 2023-04-13 | [
[
"Martinez",
"Jhan N.",
""
],
[
"Rodriguez",
"Jose F.",
""
],
[
"Rodriguez",
"Yeinzon",
""
],
[
"Gomez",
"Gabriel",
""
]
] | The generalized SU(2) Proca theory is a vector-tensor modified gravity theory where the action is invariant under both diffeomorphisms and global internal transformations of the SU(2) group. This work constitutes the first approach to investigate the physical properties of the theory at astrophysical scales. We have fo... |
1011.6466 | Theodore A. Jacobson | Isaac Carruthers and Ted Jacobson | Cosmic alignment of the aether | 7 pages, 2 figures; v.2: typos corrected, minor edits, version
published in PRD | Phys.Rev.D83:024034,2011 | 10.1103/PhysRevD.83.024034 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In Einstein-aether theory and Horava gravity, a timelike unit vector is
coupled to the spacetime metric. It has previously been shown that in an
exponentially expanding homogeneous, isotropic background, small perturbations
of the vector relax back to the isotropic frame. Here we investigate large
deviations from iso... | [
{
"created": "Tue, 30 Nov 2010 05:58:29 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Jan 2011 07:27:58 GMT",
"version": "v2"
}
] | 2011-03-07 | [
[
"Carruthers",
"Isaac",
""
],
[
"Jacobson",
"Ted",
""
]
] | In Einstein-aether theory and Horava gravity, a timelike unit vector is coupled to the spacetime metric. It has previously been shown that in an exponentially expanding homogeneous, isotropic background, small perturbations of the vector relax back to the isotropic frame. Here we investigate large deviations from isotr... |
gr-qc/0306006 | Erik Schnetter | Erik Schnetter | Finding apparent horizons and other two-surfaces of constant expansion | 21 pages, 8 figures; two references added | Class.Quant.Grav.20:4719-4737,2003 | 10.1088/0264-9381/20/22/001 | null | gr-qc | null | Apparent horizons are structures of spacelike hypersurfaces that can be
determined locally in time. Closed surfaces of constant expansion (CE surfaces)
are a generalisation of apparent horizons. I present an efficient method for
locating CE surfaces. This method uses an explicit representation of the
surface, allowin... | [
{
"created": "Mon, 2 Jun 2003 14:26:14 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Aug 2003 10:00:58 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Schnetter",
"Erik",
""
]
] | Apparent horizons are structures of spacelike hypersurfaces that can be determined locally in time. Closed surfaces of constant expansion (CE surfaces) are a generalisation of apparent horizons. I present an efficient method for locating CE surfaces. This method uses an explicit representation of the surface, allowing ... |
1705.11098 | Vasilis Oikonomou | S. Nojiri, S.D. Odintsov, V.K. Oikonomou | Modified Gravity Theories on a Nutshell: Inflation, Bounce and Late-time
Evolution | Updated version, minor typos and corrected | null | 10.1016/j.physrep.2017.06.001 | Phys.Rept. 692 (2017) 1-104 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We systematically review some standard issues and also the latest
developments of modified gravity in cosmology, emphasizing on inflation,
bouncing cosmology and late-time acceleration era. Particularly, we present the
formalism of standard modified gravity theory representatives, like $F(R)$,
$F(\mathcal{G})$ and $F... | [
{
"created": "Wed, 31 May 2017 13:41:52 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Oct 2018 04:27:20 GMT",
"version": "v2"
},
{
"created": "Sun, 23 May 2021 13:57:25 GMT",
"version": "v3"
}
] | 2021-05-25 | [
[
"Nojiri",
"S.",
""
],
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K.",
""
]
] | We systematically review some standard issues and also the latest developments of modified gravity in cosmology, emphasizing on inflation, bouncing cosmology and late-time acceleration era. Particularly, we present the formalism of standard modified gravity theory representatives, like $F(R)$, $F(\mathcal{G})$ and $F(T... |
1906.03190 | Rittick Roy | Rittick Roy and Urjit A. Yajnik | Evolution of black hole shadow in the presence of ultralight bosons | New table added with improvement over previous model, version
published in Phys. Lett. B | null | 10.1016/j.physletb.2020.135284 | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Kerr black holes coupled to quantized bosonic fields display a special
version of the Hawking effect, governed by the superradiance condition. This
leads to rapid growth of boson cloud through spontaneous creation, leading to
slowing down of the black hole, and detectable as growth of the black hole
shadow. This can ... | [
{
"created": "Fri, 7 Jun 2019 15:54:02 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Feb 2020 07:34:37 GMT",
"version": "v2"
}
] | 2020-02-27 | [
[
"Roy",
"Rittick",
""
],
[
"Yajnik",
"Urjit A.",
""
]
] | Kerr black holes coupled to quantized bosonic fields display a special version of the Hawking effect, governed by the superradiance condition. This leads to rapid growth of boson cloud through spontaneous creation, leading to slowing down of the black hole, and detectable as growth of the black hole shadow. This can be... |
1602.08104 | Steffen Gielen | Steffen Gielen, Lorenzo Sindoni | Quantum Cosmology from Group Field Theory Condensates: a Review | null | SIGMA 12 (2016), 082 | 10.3842/SIGMA.2016.082 | IMPERIAL-TP-2016-SG-1 | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by-sa/4.0/ | We give, in some detail, a critical overview over recent work towards
deriving a cosmological phenomenology from the fundamental quantum dynamics of
group field theory (GFT), based on the picture of a macroscopic universe as a
"condensate" of a large number of quanta of geometry which are given by
excitations of the ... | [
{
"created": "Thu, 25 Feb 2016 21:00:15 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Aug 2016 05:23:55 GMT",
"version": "v2"
}
] | 2016-08-19 | [
[
"Gielen",
"Steffen",
""
],
[
"Sindoni",
"Lorenzo",
""
]
] | We give, in some detail, a critical overview over recent work towards deriving a cosmological phenomenology from the fundamental quantum dynamics of group field theory (GFT), based on the picture of a macroscopic universe as a "condensate" of a large number of quanta of geometry which are given by excitations of the GF... |
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