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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1412.7337 | Laurence Eaves | Laurence Eaves | The apparent fine-tuning of the cosmological, gravitational and fine
structure constants | 7 pages, no figures New title, enhanced and refined discussion, more
references. Results unchanged. v3: There were some typographical errors in
the previous versions which were pointed out by an anonymous referee, to whom
I am grateful. These have now been corrected. I have also made other minor
additions to th... | null | 10.1016/j.physa.2015.09.090 | null | gr-qc physics.hist-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A numerical coincidence relating the values of the cosmological,
gravitational and electromagnetic fine structure constants is presented and
discussed in relation to the apparent anthropic fine-tuning of these three
fundamental constants of nature.
| [
{
"created": "Tue, 23 Dec 2014 12:18:12 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Mar 2015 15:50:44 GMT",
"version": "v2"
},
{
"created": "Tue, 11 Aug 2015 15:08:39 GMT",
"version": "v3"
},
{
"created": "Thu, 13 Aug 2015 10:20:05 GMT",
"version": "v4"
}
] | 2015-10-26 | [
[
"Eaves",
"Laurence",
""
]
] | A numerical coincidence relating the values of the cosmological, gravitational and electromagnetic fine structure constants is presented and discussed in relation to the apparent anthropic fine-tuning of these three fundamental constants of nature. |
1112.1572 | Gonzalo Olmo | Gonzalo J. Olmo | Palatini Approach Beyond Einstein's Gravity | To appear in the proceedings of the XII International Symposium
Fundamental Frontiers of Physics (Udine, Italy, Nov.21-23, 2011) | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I review recent results obtained for extensions of general relativity
formulated within the Palatini formalism, an approach in which metric and
connection are treated as independent geometrical entities. The peculiar
dynamics of these theories, governed by second-order equations and having no
new degrees of freedom, ... | [
{
"created": "Wed, 7 Dec 2011 14:15:50 GMT",
"version": "v1"
}
] | 2011-12-08 | [
[
"Olmo",
"Gonzalo J.",
""
]
] | I review recent results obtained for extensions of general relativity formulated within the Palatini formalism, an approach in which metric and connection are treated as independent geometrical entities. The peculiar dynamics of these theories, governed by second-order equations and having no new degrees of freedom, ma... |
0803.2807 | Valentino Lacquaniti | Valentino Lacquaniti, Giovanni Montani | On Matter Coupling in 5D Kaluza-Klein Model | 4 pages, to appear in Proceedings of the II Stueckelberg Workshop -
Int. J. Mod. Phys. A | Int.J.Mod.Phys.A23:1270-1273,2008 | 10.1142/S0217751X08040202 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze some unphysical features of the geodesic approach to matter
coupling in a compactified Kaluza-Klein scenario, like the q/m puzzle and the
huge massive modes. We propose a new approach, based on Papapetrou multipole
expansion, that provides a new equation for the motion of a test particle. We
show how this ... | [
{
"created": "Wed, 19 Mar 2008 14:38:50 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Lacquaniti",
"Valentino",
""
],
[
"Montani",
"Giovanni",
""
]
] | We analyze some unphysical features of the geodesic approach to matter coupling in a compactified Kaluza-Klein scenario, like the q/m puzzle and the huge massive modes. We propose a new approach, based on Papapetrou multipole expansion, that provides a new equation for the motion of a test particle. We show how this eq... |
1507.01696 | Plyatsko Roman | Roman Plyatsko, Mykola Fenyk, Oleksandr Stefanyshyn | Solutions of Mathisson-Papapetrou equations for highly relativistic
spinning particles | 13 pages, 8 figures. Invited contribution as part of the Springer
series "Fundamental Theories of Physics", v.179 (2015), "Equations of Motion
in Relativistic gravity", D. Puetzfeld et al. (eds.), p. 165-190 | null | 10.1007/978-3-319-18335-0_4 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Different types of essentially nongeodesic motions of highly relativistic
spinning particles in Schwarzschild's and Kerr's background which follows from
the Mathisson-Papapetrou (MP) equations are considered. It is shown that
dependently on the correlation of signs of the spin and the particle's orbital
velocity the ... | [
{
"created": "Tue, 7 Jul 2015 08:02:10 GMT",
"version": "v1"
}
] | 2021-04-07 | [
[
"Plyatsko",
"Roman",
""
],
[
"Fenyk",
"Mykola",
""
],
[
"Stefanyshyn",
"Oleksandr",
""
]
] | Different types of essentially nongeodesic motions of highly relativistic spinning particles in Schwarzschild's and Kerr's background which follows from the Mathisson-Papapetrou (MP) equations are considered. It is shown that dependently on the correlation of signs of the spin and the particle's orbital velocity the sp... |
2312.07443 | Jan Sbierski | Jan Sbierski | The $C^0$-inextendibility of a class of FLRW spacetimes | 21 pages, 3 figures | null | null | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper studies the singularity structure of FLRW spacetimes without
particle horizons at the $C^0$-level of the metric. We show that in the case of
constant spatial curvature $K=+1$, and without any further assumptions on the
scale factor, the big bang singularity is sufficiently strong to exclude
continuous spac... | [
{
"created": "Tue, 12 Dec 2023 17:12:39 GMT",
"version": "v1"
}
] | 2023-12-13 | [
[
"Sbierski",
"Jan",
""
]
] | This paper studies the singularity structure of FLRW spacetimes without particle horizons at the $C^0$-level of the metric. We show that in the case of constant spatial curvature $K=+1$, and without any further assumptions on the scale factor, the big bang singularity is sufficiently strong to exclude continuous spacet... |
1907.05659 | Sajal Mukherjee | Sajal Mukherjee, Georgios Lukes-Gerakopoulos and Rajesh Kumble Nayak | Extended bodies moving on geodesic trajectories | 28 pages, no figure. v2, title changed, new author added, revised
version | General Relativity and Gravitation 54: 113 (2022) | 10.1007/s10714-022-02985-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work investigates whether an extended test body obeying the
Mathisson-Papapetrou- Dixon equations under the Ohashi-Kyrian-Semerak spin
supplementary condition can follow geodesic trajectories in curved spacetimes.
In particular, we explore what are the requirements under which pole-dipole and
pole-dipole-quadrup... | [
{
"created": "Fri, 12 Jul 2019 10:19:27 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jun 2022 18:02:15 GMT",
"version": "v2"
}
] | 2022-10-05 | [
[
"Mukherjee",
"Sajal",
""
],
[
"Lukes-Gerakopoulos",
"Georgios",
""
],
[
"Nayak",
"Rajesh Kumble",
""
]
] | This work investigates whether an extended test body obeying the Mathisson-Papapetrou- Dixon equations under the Ohashi-Kyrian-Semerak spin supplementary condition can follow geodesic trajectories in curved spacetimes. In particular, we explore what are the requirements under which pole-dipole and pole-dipole-quadrupol... |
1907.12595 | Michael Seifert | Michael D Seifert | Lorentz-violating gravity and the bootstrap procedure | 24 pages | null | 10.1088/1361-6382/ab53ef | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In conventional gravitational physics, the so-called "bootstrap procedure"
can be used to extrapolate from a linear model of a rank-2 tensor to a full
non-linear theory of gravity (i.e., general relativity) via a coupling to the
stress-energy of the model. In this work, I extend this procedure to a
"Lorentz-violating... | [
{
"created": "Mon, 29 Jul 2019 18:39:11 GMT",
"version": "v1"
}
] | 2020-04-08 | [
[
"Seifert",
"Michael D",
""
]
] | In conventional gravitational physics, the so-called "bootstrap procedure" can be used to extrapolate from a linear model of a rank-2 tensor to a full non-linear theory of gravity (i.e., general relativity) via a coupling to the stress-energy of the model. In this work, I extend this procedure to a "Lorentz-violating" ... |
2208.10197 | Naoki Tsukamoto | Naoki Tsukamoto | Affine perturbation series of the deflection angle of a ray near the
photon sphere of a Reissner-Nordstr\"{o}m black hole | 8 pages, 4 figures, minor changes, accepted for publication in
Physical Review D | Phys. Rev. D 106, 084025 (2022) | 10.1103/PhysRevD.106.084025 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We investigate the affine perturbation series of the deflection angle of a
ray near the photon sphere of an extreme Reissner-Nordstr\"{o}m black hole. We
compare the 0th and 1st orders of the affine perturbation series with the
deflection angle in a strong deflection limit. We conclude that the 0th order
of the affin... | [
{
"created": "Mon, 22 Aug 2022 10:39:24 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Oct 2022 03:54:31 GMT",
"version": "v2"
}
] | 2022-10-25 | [
[
"Tsukamoto",
"Naoki",
""
]
] | We investigate the affine perturbation series of the deflection angle of a ray near the photon sphere of an extreme Reissner-Nordstr\"{o}m black hole. We compare the 0th and 1st orders of the affine perturbation series with the deflection angle in a strong deflection limit. We conclude that the 0th order of the affine ... |
2105.02054 | Massimo Tinto | Massimo Tinto, Sanjeev Dhurandhar, Prasanna Joshi | Matrix Representation of Time-Delay Interferometry | 11 pages, 2 figures. Accepted for publication in Physical Review D | Phys. Rev. D 104, 044033 (2021) | 10.1103/PhysRevD.104.044033 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Time-Delay Interferometry (TDI) is the data processing technique that cancels
the large laser phase fluctuations affecting the one-way Doppler measurements
made by unequal-arm space-based gravitational wave interferometers. By taking
finite linear combinations of properly time-shifted Doppler measurements, laser
phas... | [
{
"created": "Wed, 5 May 2021 13:46:14 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Jul 2021 15:26:07 GMT",
"version": "v2"
}
] | 2021-08-25 | [
[
"Tinto",
"Massimo",
""
],
[
"Dhurandhar",
"Sanjeev",
""
],
[
"Joshi",
"Prasanna",
""
]
] | Time-Delay Interferometry (TDI) is the data processing technique that cancels the large laser phase fluctuations affecting the one-way Doppler measurements made by unequal-arm space-based gravitational wave interferometers. By taking finite linear combinations of properly time-shifted Doppler measurements, laser phase ... |
1807.08704 | Suprit Singh | Viqar Husain and Suprit Singh | Does quantum gravity relate the constants of nature? | It does. See the surfaces in Figure 2. The article has 9 pages, and 3
figures of which one is a table | null | 10.1142/S0218271819500159 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The central equation of quantum gravity is the Wheeler-DeWitt equation. We
give an argument suggesting that exact solutions of this equation give a
surface in the space of coupling constants. This provides a mechanism for
determining the cosmological constant as a function of the gravitational and
other interaction c... | [
{
"created": "Mon, 23 Jul 2018 16:31:30 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Jul 2018 15:33:36 GMT",
"version": "v2"
}
] | 2018-11-02 | [
[
"Husain",
"Viqar",
""
],
[
"Singh",
"Suprit",
""
]
] | The central equation of quantum gravity is the Wheeler-DeWitt equation. We give an argument suggesting that exact solutions of this equation give a surface in the space of coupling constants. This provides a mechanism for determining the cosmological constant as a function of the gravitational and other interaction con... |
0809.4143 | Kamal Nandi | K.K. Nandi, Y.Z. Zhang, R.G. Cai and A. Panchenko | Energetics in Condensate Star and Wormholes | 16 pages, 1 figure, references added, To appear in PRD | Phys.Rev.D79:024011,2009 | 10.1103/PhysRevD.79.024011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is known that the total gravitational energy in localized sources having
static spherical symmetry and satisfying energy conditions is negative
(attractive gravity). A natural query is how the gravitational energy behaves
under circumstances where energy conditions are violated. To answer this, the
known expressio... | [
{
"created": "Wed, 24 Sep 2008 09:58:26 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Dec 2008 12:39:28 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Dec 2008 09:49:01 GMT",
"version": "v3"
}
] | 2009-01-21 | [
[
"Nandi",
"K. K.",
""
],
[
"Zhang",
"Y. Z.",
""
],
[
"Cai",
"R. G.",
""
],
[
"Panchenko",
"A.",
""
]
] | It is known that the total gravitational energy in localized sources having static spherical symmetry and satisfying energy conditions is negative (attractive gravity). A natural query is how the gravitational energy behaves under circumstances where energy conditions are violated. To answer this, the known expression ... |
1508.02592 | Jean-Philippe Nicolas | Jean-Philippe Nicolas | The conformal approach to asymptotic analysis | 32 pages, 6 figures | null | null | null | gr-qc math-ph math.AP math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This essay was written as an extended version of a talk given at a conference
in Strasbourg on "Riemann, Einstein and geometry", organized by Athanase
Papadopoulos in September 2014. Its aim is to present Roger Penrose's approach
to asymptotic analysis in general relativity, which is based on conformal
geometric tech... | [
{
"created": "Tue, 11 Aug 2015 13:47:42 GMT",
"version": "v1"
}
] | 2015-08-12 | [
[
"Nicolas",
"Jean-Philippe",
""
]
] | This essay was written as an extended version of a talk given at a conference in Strasbourg on "Riemann, Einstein and geometry", organized by Athanase Papadopoulos in September 2014. Its aim is to present Roger Penrose's approach to asymptotic analysis in general relativity, which is based on conformal geometric techni... |
gr-qc/0505062 | Anzhong Wang | A.Y. Miguelote, N. A. Tomimura and Anzhong Wang | Gravitational Collapse of Circularly Symmetric Stiff Fluid with
Self-Similarity in 2+1 Gravity | latex file, 1 figure; last version to appear in Prog. Theor. Phys | null | 10.1143/PTP.114.895 | null | gr-qc | null | Linear perturbations of homothetic self-similar stiff fluid solutions,
$S[n]$, with circular symmetry in 2+1 gravity are studied. It is found that,
except for those with $n = 1$ and $n = 3$, none of them is stable and all have
more than one unstable mode. Hence, {\em none of these solutions can be
critical}.
| [
{
"created": "Thu, 12 May 2005 20:02:06 GMT",
"version": "v1"
},
{
"created": "Wed, 25 May 2005 17:25:52 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Oct 2005 21:05:27 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Miguelote",
"A. Y.",
""
],
[
"Tomimura",
"N. A.",
""
],
[
"Wang",
"Anzhong",
""
]
] | Linear perturbations of homothetic self-similar stiff fluid solutions, $S[n]$, with circular symmetry in 2+1 gravity are studied. It is found that, except for those with $n = 1$ and $n = 3$, none of them is stable and all have more than one unstable mode. Hence, {\em none of these solutions can be critical}. |
1501.05841 | Shahram Panahiyan | S. H. Hendi, S. Panahiyan and H. Mohammadpour | Third order Lovelock black branes in the presence of a nonlinear
electromagnetic field | 6 pages, 3 figures | Eur. Phys. J. C 72 (2012)2184 | 10.1140/epjc/s10052-012-2184-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider third order Lovelock gravity coupled to an U(1) gauge field for
which its Lagrangian is given by a power of Maxwell invariant. In this paper,
we present a class of horizon flat rotating black branes and investigate their
geometrical properties and the effect of nonlinearity on the solutions. We use
some k... | [
{
"created": "Thu, 22 Jan 2015 13:12:42 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Hendi",
"S. H.",
""
],
[
"Panahiyan",
"S.",
""
],
[
"Mohammadpour",
"H.",
""
]
] | We consider third order Lovelock gravity coupled to an U(1) gauge field for which its Lagrangian is given by a power of Maxwell invariant. In this paper, we present a class of horizon flat rotating black branes and investigate their geometrical properties and the effect of nonlinearity on the solutions. We use some kno... |
1106.5283 | Roh-Suan Tung | Kerson Huang, Hwee-Boon Low, Roh-Suan Tung | Scalar Field Cosmology II: Superfluidity, Quantum Turbulence, and
Inflation | 29 pages, 7 figures, published version | International Journal of Modern Physics A 27 (2012) 1250154 | 10.1142/S0217751X12501540 | IASa003 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We generalize the big-bang model in a previous paper by extending the real
vacuum scalar field to a complex vacuum scalar field, within the FLRW
framework. The phase dynamics of the scalar field, which makes the universe a
superfluid, is described in terms of a density of quantized vortex lines, and a
tangle of vorte... | [
{
"created": "Sun, 26 Jun 2011 23:39:29 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Jun 2011 16:32:54 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Sep 2011 09:12:18 GMT",
"version": "v3"
},
{
"created": "Wed, 10 Oct 2012 09:17:30 GMT",
"version": "v4"
}
] | 2012-10-11 | [
[
"Huang",
"Kerson",
""
],
[
"Low",
"Hwee-Boon",
""
],
[
"Tung",
"Roh-Suan",
""
]
] | We generalize the big-bang model in a previous paper by extending the real vacuum scalar field to a complex vacuum scalar field, within the FLRW framework. The phase dynamics of the scalar field, which makes the universe a superfluid, is described in terms of a density of quantized vortex lines, and a tangle of vortex ... |
2107.13483 | Roldao da Rocha | Roldao da Rocha | Gravitational decoupling and superfluid stars | 17 pages, 31 figures, improved, published version | Eur. Phys. J C 81 (2021) 845 | 10.1140/epjc/s10052-021-09647-y | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitational decoupling is applied to studying minimal geometric
deformed (MGD) compact superfluid stars, in covariant logarithmic scalar
gravity on fluid branes. The brane finite tension is shown to provide more
realistic values for the asymptotic value of the mass function of MGD
superfluid stars, besides cons... | [
{
"created": "Wed, 28 Jul 2021 16:47:09 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Sep 2021 12:07:18 GMT",
"version": "v2"
}
] | 2021-09-24 | [
[
"da Rocha",
"Roldao",
""
]
] | The gravitational decoupling is applied to studying minimal geometric deformed (MGD) compact superfluid stars, in covariant logarithmic scalar gravity on fluid branes. The brane finite tension is shown to provide more realistic values for the asymptotic value of the mass function of MGD superfluid stars, besides constr... |
1102.1521 | Antonio De Felice | Antonio De Felice, Teruaki Suyama, Takahiro Tanaka | Stability of Schwarzschild-like solutions in f(R,G) gravity models | 15 pages, uses RevTeX4-1 | Phys.Rev.D83:104035,2011 | 10.1103/PhysRevD.83.104035 | YITP-11-17 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study linear metric perturbations around a spherically symmetric static
spacetime for general f(R,G) theories, where R is the Ricci scalar and G is the
Gauss-Bonnet term. We find that unless the determinant of the Hessian of f(R,G)
is zero, even-type perturbations have a ghost for any multi-pole mode. In order
for... | [
{
"created": "Tue, 8 Feb 2011 07:24:28 GMT",
"version": "v1"
}
] | 2011-06-02 | [
[
"De Felice",
"Antonio",
""
],
[
"Suyama",
"Teruaki",
""
],
[
"Tanaka",
"Takahiro",
""
]
] | We study linear metric perturbations around a spherically symmetric static spacetime for general f(R,G) theories, where R is the Ricci scalar and G is the Gauss-Bonnet term. We find that unless the determinant of the Hessian of f(R,G) is zero, even-type perturbations have a ghost for any multi-pole mode. In order for t... |
1903.12486 | Junji Jia | Yaoguang Wang, Xionghui Liu, Nan Yang, Jiawei Liu and Junji Jia | Escape, bound and capture geodesics in local static coordinates in
Schwarzschild spacetime | 26 pages, 10 figures | null | 10.1007/s10714-020-2666-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The classical geodesics of timelike particles in Schwarzschild spacetime is
analyzed according to the particle starting radius $r$, velocity $v$ and angle
$\alpha$ against the radial outward direction in the reference system of an
local static observer. The region of escape, bound and capture orbits in the
parameter ... | [
{
"created": "Fri, 29 Mar 2019 12:48:18 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Jul 2019 05:39:41 GMT",
"version": "v2"
}
] | 2020-03-11 | [
[
"Wang",
"Yaoguang",
""
],
[
"Liu",
"Xionghui",
""
],
[
"Yang",
"Nan",
""
],
[
"Liu",
"Jiawei",
""
],
[
"Jia",
"Junji",
""
]
] | The classical geodesics of timelike particles in Schwarzschild spacetime is analyzed according to the particle starting radius $r$, velocity $v$ and angle $\alpha$ against the radial outward direction in the reference system of an local static observer. The region of escape, bound and capture orbits in the parameter sp... |
1308.4063 | Muxin Han | Muxin Han | Covariant Loop Quantum Gravity, Low Energy Perturbation Theory, and
Einstein Gravity with High Curvature UV Corrections | 5 pages, 1 figure, presentation improved, references added | Phys. Rev. D 89, 124001 (2014) | 10.1103/PhysRevD.89.124001 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A low-energy perturbation theory is developed from the nonperturbative
framework of covariant Loop Quantum Gravity (LQG) by employing the background
field method. The resulting perturbation theory is a 2-parameter expansion in
the semiclassical and low-energy regime. The two expansion parameters are the
large spin an... | [
{
"created": "Mon, 19 Aug 2013 15:45:03 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Aug 2013 17:03:23 GMT",
"version": "v2"
},
{
"created": "Tue, 11 Feb 2014 12:48:47 GMT",
"version": "v3"
}
] | 2014-06-17 | [
[
"Han",
"Muxin",
""
]
] | A low-energy perturbation theory is developed from the nonperturbative framework of covariant Loop Quantum Gravity (LQG) by employing the background field method. The resulting perturbation theory is a 2-parameter expansion in the semiclassical and low-energy regime. The two expansion parameters are the large spin and ... |
1101.2722 | Hernando Quevedo | M. Akbar, H. Quevedo, K. Saifullah, A. Sanchez, and S. Taj | Thermodynamic Geometry Of Charged Rotating BTZ Black Holes | null | Phys.Rev.D83:084031,2011 | 10.1103/PhysRevD.83.084031 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the thermodynamics and the thermodynamic geometries of charged
rotating BTZ (CR-BTZ) black holes in (2+1)-gravity. We investigate the
thermodynamics of these systems within the context of the Weinhold and
Ruppeiner thermodynamic geometries and the recently developed formalism of
geometrothermodynamics (GTD).... | [
{
"created": "Fri, 14 Jan 2011 06:30:41 GMT",
"version": "v1"
}
] | 2015-03-17 | [
[
"Akbar",
"M.",
""
],
[
"Quevedo",
"H.",
""
],
[
"Saifullah",
"K.",
""
],
[
"Sanchez",
"A.",
""
],
[
"Taj",
"S.",
""
]
] | We study the thermodynamics and the thermodynamic geometries of charged rotating BTZ (CR-BTZ) black holes in (2+1)-gravity. We investigate the thermodynamics of these systems within the context of the Weinhold and Ruppeiner thermodynamic geometries and the recently developed formalism of geometrothermodynamics (GTD). C... |
2004.12421 | Hai-Tian Wang | Hai-Tian Wang, Peng-Cheng Li, Jin-Liang Jiang, Guan-Wen Yuan, Yi-Ming
Hu and Yi-Zhong Fan | Constrains on the electric charges of the binary black holes with GWTC-1
events | 9 pages, 3 figures | Eur. Phys. J. C (2021) 81:769 | 10.1140/epjc/s10052-021-09555-1 | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Testing black hole's charged property is a fascinating topic in modified
gravity and black hole astrophysics. In the first Gravitational-Wave Transient
Catalog (GWTC-1), ten binary black hole merger events have been formally
reported, and these gravitational wave signals have significantly enhanced our
understanding ... | [
{
"created": "Sun, 26 Apr 2020 15:53:41 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Nov 2020 08:01:15 GMT",
"version": "v2"
},
{
"created": "Fri, 27 Aug 2021 01:56:35 GMT",
"version": "v3"
}
] | 2021-08-30 | [
[
"Wang",
"Hai-Tian",
""
],
[
"Li",
"Peng-Cheng",
""
],
[
"Jiang",
"Jin-Liang",
""
],
[
"Yuan",
"Guan-Wen",
""
],
[
"Hu",
"Yi-Ming",
""
],
[
"Fan",
"Yi-Zhong",
""
]
] | Testing black hole's charged property is a fascinating topic in modified gravity and black hole astrophysics. In the first Gravitational-Wave Transient Catalog (GWTC-1), ten binary black hole merger events have been formally reported, and these gravitational wave signals have significantly enhanced our understanding of... |
2005.14653 | Jaume Haro | Jaume Haro and Llibert Arest\'e Sal\'o | Note on the reheating temperature in Starobinsky-type potentials | Version accepted for publication in GERG | null | 10.1007/s10714-020-02770-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The relation between the reheating temperature, the number of e-folds and the
spectral index is shown for the Starobinsky model and some of its descendants
through a very detailed calculation of these three quantities. The conclusion
is that for viable temperatures between $1$ MeV and $10^9$ GeV the
corresponding val... | [
{
"created": "Fri, 29 May 2020 16:31:53 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Jun 2020 15:23:52 GMT",
"version": "v2"
},
{
"created": "Wed, 18 Nov 2020 09:53:51 GMT",
"version": "v3"
}
] | 2021-04-14 | [
[
"Haro",
"Jaume",
""
],
[
"Saló",
"Llibert Aresté",
""
]
] | The relation between the reheating temperature, the number of e-folds and the spectral index is shown for the Starobinsky model and some of its descendants through a very detailed calculation of these three quantities. The conclusion is that for viable temperatures between $1$ MeV and $10^9$ GeV the corresponding value... |
1902.08180 | Baoyi Chen | Baoyi Chen, Yanbei Chen, Yiqiu Ma, Ka-Lok R. Lo, and Ling Sun | Instability of exotic compact objects and its implications for
gravitational-wave echoes | 5 pages, 4 figures | null | null | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Exotic compact objects (ECOs) have recently become an exciting research
subject, since they are speculated to have a special response to the incident
gravitational waves (GWs) that leads to GW echoes. We show that energy carried
by GWs can easily cause the event horizon to form out of a static ECO ---
leaving no echo... | [
{
"created": "Thu, 21 Feb 2019 18:45:24 GMT",
"version": "v1"
}
] | 2019-02-22 | [
[
"Chen",
"Baoyi",
""
],
[
"Chen",
"Yanbei",
""
],
[
"Ma",
"Yiqiu",
""
],
[
"Lo",
"Ka-Lok R.",
""
],
[
"Sun",
"Ling",
""
]
] | Exotic compact objects (ECOs) have recently become an exciting research subject, since they are speculated to have a special response to the incident gravitational waves (GWs) that leads to GW echoes. We show that energy carried by GWs can easily cause the event horizon to form out of a static ECO --- leaving no echo s... |
2404.03607 | Anuj Kankani | Anuj Kankani and Sean T. McWilliams | Testing the Boundary-to-Bound Correspondence with Numerical Relativity | null | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Boundary-to-Bound (B2B) correspondence, which connects orbital and
radiative observables between bound and unbound orbits, has recently been
introduced and demonstrated in the perturbative regime. We produce a large
number of numerical relativity simulations of bound and unbound encounters
between two nonspinning... | [
{
"created": "Thu, 4 Apr 2024 17:28:43 GMT",
"version": "v1"
}
] | 2024-04-05 | [
[
"Kankani",
"Anuj",
""
],
[
"McWilliams",
"Sean T.",
""
]
] | The Boundary-to-Bound (B2B) correspondence, which connects orbital and radiative observables between bound and unbound orbits, has recently been introduced and demonstrated in the perturbative regime. We produce a large number of numerical relativity simulations of bound and unbound encounters between two nonspinning e... |
1301.5543 | Christian Friedrich Steinwachs | Christian F. Steinwachs and Alexander Yu. Kamenshchik | Non-minimal Higgs Inflation and Frame Dependence in Cosmology | 4 pages, 3 figures. To appear in the proceedings of the Multiverse
and Fundamental Cosmology Conference (Multicosmofun 2012), Szczecin, Poland | null | 10.1063/1.4791748 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a very general class of cosmological models with scalar fields
non-minimally coupled to gravity. A particular representative in this class is
given by the non-minimal Higgs inflation model in which the Standard Model
Higgs boson and the inflaton are described by one and the same scalar particle.
While ... | [
{
"created": "Wed, 23 Jan 2013 15:51:38 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Steinwachs",
"Christian F.",
""
],
[
"Kamenshchik",
"Alexander Yu.",
""
]
] | We investigate a very general class of cosmological models with scalar fields non-minimally coupled to gravity. A particular representative in this class is given by the non-minimal Higgs inflation model in which the Standard Model Higgs boson and the inflaton are described by one and the same scalar particle. While th... |
1007.2429 | Nicolas Yunes | David Garfinkle, Frans Pretorius and Nicolas Yunes | Linear Stability Analysis and the Speed of Gravitational Waves in
Dynamical Chern-Simons Modified Gravity | 4 pages, no figures, accepted for publication in Phys. Rev. D, Rapid
Communications. Corrected a typo in the printed version in Eq. (12) | Phys.Rev.D82:041501,2010 | 10.1103/PhysRevD.82.041501 | null | gr-qc astro-ph.CO astro-ph.GA hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a linear stability analysis of dynamical Chern-Simons modified
gravity in the geometric optics approximation and find that it is linearly
stable on the backgrounds considered. Our analysis also reveals that
gravitational waves in the modified theory travel at the speed of light in
Minkowski spacetime. Howe... | [
{
"created": "Wed, 14 Jul 2010 20:38:06 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Oct 2013 15:36:14 GMT",
"version": "v2"
}
] | 2013-10-09 | [
[
"Garfinkle",
"David",
""
],
[
"Pretorius",
"Frans",
""
],
[
"Yunes",
"Nicolas",
""
]
] | We perform a linear stability analysis of dynamical Chern-Simons modified gravity in the geometric optics approximation and find that it is linearly stable on the backgrounds considered. Our analysis also reveals that gravitational waves in the modified theory travel at the speed of light in Minkowski spacetime. Howeve... |
2111.02894 | Bivudutta Mishra Dr. | A.S. Agrawal, Francisco Tello-Ortiz, B.Mishra, S.K. Tripathy | Bouncing cosmology in extended gravity and its reconstruction as dark
energy model | 13 pages, 18 figures, Accepted version, Fortschritte der Physik | Fortschritte der Physik, 70, 2100065, 2022 | 10.1002/prop.202100065 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we have presented a bouncing cosmological model of the
Universe in an extended theory of gravity. The dynamical behaviour of the model
obtained from the flat FLRW space-time along with the violation of null energy
condition have been shown. The geometrical parameters show singularity
behaviour at the b... | [
{
"created": "Tue, 2 Nov 2021 14:18:06 GMT",
"version": "v1"
}
] | 2022-04-22 | [
[
"Agrawal",
"A. S.",
""
],
[
"Tello-Ortiz",
"Francisco",
""
],
[
"Mishra",
"B.",
""
],
[
"Tripathy",
"S. K.",
""
]
] | In this paper, we have presented a bouncing cosmological model of the Universe in an extended theory of gravity. The dynamical behaviour of the model obtained from the flat FLRW space-time along with the violation of null energy condition have been shown. The geometrical parameters show singularity behaviour at the bou... |
2401.14849 | Henri Inchausp\'e Dr. | Lavinia Heisenberg, Henri Inchausp\'e, David Maibach | Observing Kinematic Anisotropies of the Stochastic Background with LISA | 18 pages, 11 figures | null | null | null | gr-qc astro-ph.CO astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a diagnostic tool for future analyses of stochastic gravitational
wave background signals of extra-galactic origin in LISA data. Next-generation
gravitational wave detectors hold the capability to track unresolved
gravitational waves bundled into a stochastic background. This composite
background contains ... | [
{
"created": "Fri, 26 Jan 2024 13:30:50 GMT",
"version": "v1"
}
] | 2024-01-29 | [
[
"Heisenberg",
"Lavinia",
""
],
[
"Inchauspé",
"Henri",
""
],
[
"Maibach",
"David",
""
]
] | We propose a diagnostic tool for future analyses of stochastic gravitational wave background signals of extra-galactic origin in LISA data. Next-generation gravitational wave detectors hold the capability to track unresolved gravitational waves bundled into a stochastic background. This composite background contains co... |
gr-qc/0612066 | J. Mark Heinzle | Robert Beig, J. Mark Heinzle, Bernd G. Schmidt | Helically symmetric N-particle solutions in scalar gravity | 5 pages, 1 figure; minor corrections and changes; accepted for
publication in Physical Review Letters | Phys.Rev.Lett.98:121102,2007 | 10.1103/PhysRevLett.98.121102 | null | gr-qc | null | Within a scalar model theory of gravity, where the interaction between
particles is given by the half-retarded + half-advanced solution of the scalar
wave equation, we consider an N-body problem: we investigate configurations of
N particles which form an equilateral N-angle and are in helical motion about
their commo... | [
{
"created": "Mon, 11 Dec 2006 18:06:20 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Mar 2007 13:49:08 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Beig",
"Robert",
""
],
[
"Heinzle",
"J. Mark",
""
],
[
"Schmidt",
"Bernd G.",
""
]
] | Within a scalar model theory of gravity, where the interaction between particles is given by the half-retarded + half-advanced solution of the scalar wave equation, we consider an N-body problem: we investigate configurations of N particles which form an equilateral N-angle and are in helical motion about their common ... |
0810.0153 | Yurij Baryshev | Yu. V. Baryshev (Astron.Inst.St.-Petersburg Univ.) | Expanding Space: The Root of Conceptual Problems of the Cosmological
Physics | 11 pages, proceedings of the International conference "Problems of
Practical Cosmology", 23-27 June 2008, St.-Petersburg, Russia, see
http://ppc08.astro.spbu.ru/text_proc.html | in "Practical Cosmology", v.2, pp.20-30, 2008 | null | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The space expansion physics contains several paradoxes which were clearly
demonstrated by Edward Harrison (1981, 1995, 2000), who emphasized that the
cooling of homogeneous hot gas (including photon gas of CBR) in the standard
cosmological model based on the violation of energy conservation by the
expanding space. In... | [
{
"created": "Wed, 1 Oct 2008 12:57:20 GMT",
"version": "v1"
}
] | 2008-10-02 | [
[
"Baryshev",
"Yu. V.",
"",
"Astron.Inst.St.-Petersburg Univ."
]
] | The space expansion physics contains several paradoxes which were clearly demonstrated by Edward Harrison (1981, 1995, 2000), who emphasized that the cooling of homogeneous hot gas (including photon gas of CBR) in the standard cosmological model based on the violation of energy conservation by the expanding space. In m... |
gr-qc/0508067 | Yanbei Chen | Alessandra Buonanno, Yanbei Chen and Thibault Damour | Transition from inspiral to plunge in precessing binaries of spinning
black holes | 31 pages, 7 tables, and 13 figures | Phys.Rev.D74:104005,2006 | 10.1103/PhysRevD.74.104005 | null | gr-qc | null | We investigate the non-adiabatic dynamics of spinning black hole binaries by
using an analytical Hamiltonian completed with a radiation-reaction force,
containing spin couplings, which matches the known rates of energy and angular
momentum losses on quasi-circular orbits. We consider both a straightforward
post-Newto... | [
{
"created": "Tue, 16 Aug 2005 21:49:04 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Buonanno",
"Alessandra",
""
],
[
"Chen",
"Yanbei",
""
],
[
"Damour",
"Thibault",
""
]
] | We investigate the non-adiabatic dynamics of spinning black hole binaries by using an analytical Hamiltonian completed with a radiation-reaction force, containing spin couplings, which matches the known rates of energy and angular momentum losses on quasi-circular orbits. We consider both a straightforward post-Newtoni... |
gr-qc/0209052 | Mihalis Dafermos | Mihalis Dafermos | Stability and Instability of the Reissner-Nordstrom Cauchy Horizon and
the Problem of Uniqueness in General Relativity | 18 pages, 13 figures Talk given at Rutgers in "Conference on
Non-compact Variational Problems and General Relativity" in honor of Haim
Brezis and Felix Browder | Contemp. Math. 350 (2004), 99--113 | null | null | gr-qc | null | This talk describes some recent results [16] regarding the problem of
uniqueness in the large (also known as strong cosmic censorship) for the
initial value problem in general relativity. In order to isolate the essential
analytic features of the problem from the complicated setting of gravitational
collapse in which... | [
{
"created": "Tue, 17 Sep 2002 14:13:54 GMT",
"version": "v1"
}
] | 2011-10-13 | [
[
"Dafermos",
"Mihalis",
""
]
] | This talk describes some recent results [16] regarding the problem of uniqueness in the large (also known as strong cosmic censorship) for the initial value problem in general relativity. In order to isolate the essential analytic features of the problem from the complicated setting of gravitational collapse in which i... |
1706.08846 | Riaz Ahmed | G. Abbas, Riaz Ahmed | Models of Collapsing and Expanding Anisotropic Gravitating Source in
$f(R,T)$ Theory of Gravity | 18 Pages, 8 Figures, Accepted for Publication in European Physical
Journal C | null | 10.1140/epjc/s10052-017-5025-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we have formulated the exact solutions of the non-static
anisotropic gravitating source in $f(R,T)$ gravity which may lead to expansion
and collapse. By assuming the no thermal conduction in gravitating source, we
have determine parametric solutions in $f(R,T)$ gravity with non-static
spherical geometr... | [
{
"created": "Sat, 24 Jun 2017 08:15:28 GMT",
"version": "v1"
}
] | 2017-08-02 | [
[
"Abbas",
"G.",
""
],
[
"Ahmed",
"Riaz",
""
]
] | In this paper, we have formulated the exact solutions of the non-static anisotropic gravitating source in $f(R,T)$ gravity which may lead to expansion and collapse. By assuming the no thermal conduction in gravitating source, we have determine parametric solutions in $f(R,T)$ gravity with non-static spherical geometry ... |
2105.00881 | Cosimo Bambi | Cosimo Bambi, Dejan Stojkovic | Astrophysical Wormholes | 13 pages, 9 figures. Invited contribution to the special issue of
Universe "Recent Advances in Wormhole Physics" (Eds. K.A. Bronnikov and S.
Sushkov). Partially based on e-Print 2010.03947 [gr-qc], e-Print 2007.12184
[gr-qc], e-Print 1910.00429 [gr-qc], e-Print 1810.03432 [hep-th]. v2: added
some references | Universe (2021) 7:136 | 10.3390/universe7050136 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Wormholes are hypothetical topologically-non-trivial structures of the
spacetime. From the theoretical point of view, the possibility of their
existence is challenging but cannot be ruled out. This article is a compact and
non-exhaustive review of past and current efforts to search for astrophysical
wormholes in the ... | [
{
"created": "Mon, 3 May 2021 14:05:17 GMT",
"version": "v1"
},
{
"created": "Sat, 8 May 2021 09:52:12 GMT",
"version": "v2"
}
] | 2021-05-11 | [
[
"Bambi",
"Cosimo",
""
],
[
"Stojkovic",
"Dejan",
""
]
] | Wormholes are hypothetical topologically-non-trivial structures of the spacetime. From the theoretical point of view, the possibility of their existence is challenging but cannot be ruled out. This article is a compact and non-exhaustive review of past and current efforts to search for astrophysical wormholes in the Un... |
2109.05481 | Luca Visinelli | Luca Visinelli | Boson Stars and Oscillatons: A Review | 48 pages, 4 figures, 2 tables. Matches the version accepted for
publication on IJMPD | Int. J. Mod. Phys. D Vol. 30, Issue 15, No. 2130006 (2021) | 10.1142/S0218271821300068 | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Compact objects occupy a pivotal role in the exploration of Nature. The
interest spans from the role of compact objects in astrophysics to their
detection through various methods (gravitational waves interferometry,
microlensing, imaging). While the existence of compact objects made of fermions
(neutron stars and whi... | [
{
"created": "Sun, 12 Sep 2021 10:23:13 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Oct 2021 09:25:40 GMT",
"version": "v2"
},
{
"created": "Thu, 12 Jan 2023 05:47:33 GMT",
"version": "v3"
}
] | 2023-01-13 | [
[
"Visinelli",
"Luca",
""
]
] | Compact objects occupy a pivotal role in the exploration of Nature. The interest spans from the role of compact objects in astrophysics to their detection through various methods (gravitational waves interferometry, microlensing, imaging). While the existence of compact objects made of fermions (neutron stars and white... |
1303.1762 | Jason Bates | Jason D. Bates | Stochastic Force Due to a Quantum Scalar Field in Minkowski Spacetime | 14 pages, 4 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A method is presented for computing approximate expressions for the
stochastic force term $\xi_{ab}$ which appears in the Einstein-Langevin
equation of stochastic gravity. Within this framework, $\xi_{ab}$ is a
stochastic tensor field whose probability distribution mimics the probability
distribution of the fluctuati... | [
{
"created": "Thu, 7 Mar 2013 17:39:53 GMT",
"version": "v1"
}
] | 2013-03-08 | [
[
"Bates",
"Jason D.",
""
]
] | A method is presented for computing approximate expressions for the stochastic force term $\xi_{ab}$ which appears in the Einstein-Langevin equation of stochastic gravity. Within this framework, $\xi_{ab}$ is a stochastic tensor field whose probability distribution mimics the probability distribution of the fluctuation... |
1603.00362 | William G. Cook | William G. Cook, Pau Figueras, Markus Kunesch, Ulrich Sperhake, Saran
Tunyasuvunakool | Dimensional reduction in numerical relativity: Modified cartoon
formalism and regularization | 25 pages, 2 figures, Special Issue on Selected Papers of the III
Amazonian Symposium on Physics | null | 10.1142/S0218271816410133 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present in detail the Einstein equations in the
Baumgarte-Shapiro-Shibata-Nakamura formulation for the case of $D$ dimensional
spacetimes with $SO(D-d)$ isometry based on a method originally introduced in
Ref.1. Regularized expressions are given for a numerical implementation of this
method on a vertex centered gr... | [
{
"created": "Tue, 1 Mar 2016 17:11:10 GMT",
"version": "v1"
}
] | 2016-08-17 | [
[
"Cook",
"William G.",
""
],
[
"Figueras",
"Pau",
""
],
[
"Kunesch",
"Markus",
""
],
[
"Sperhake",
"Ulrich",
""
],
[
"Tunyasuvunakool",
"Saran",
""
]
] | We present in detail the Einstein equations in the Baumgarte-Shapiro-Shibata-Nakamura formulation for the case of $D$ dimensional spacetimes with $SO(D-d)$ isometry based on a method originally introduced in Ref.1. Regularized expressions are given for a numerical implementation of this method on a vertex centered grid... |
2107.12430 | Vasilis Oikonomou | V.K. Oikonomou | Universal Inflationary Attractors Implications on Static Neutron Stars | CQG Accepted | null | 10.1088/1361-6382/ac161c | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study static neutron stars in the context of a class of non-minimally
coupled inflationary potentials, the universal attractors. Universal attractors
are known to generate a viable inflationary era, and they fall into the same
category of inflationary phenomenology as the $R^2$ model and other well-known
cosmologi... | [
{
"created": "Mon, 26 Jul 2021 18:46:00 GMT",
"version": "v1"
}
] | 2021-09-01 | [
[
"Oikonomou",
"V. K.",
""
]
] | We study static neutron stars in the context of a class of non-minimally coupled inflationary potentials, the universal attractors. Universal attractors are known to generate a viable inflationary era, and they fall into the same category of inflationary phenomenology as the $R^2$ model and other well-known cosmologica... |
1902.01386 | Jonathan Engle | Jonathan Engle and Ilya Vilensky | Uniqueness of minimal loop quantum cosmology dynamics | 6 pages; references added, minor revisions of phrasing | Phys. Rev. D 100, 121901 (2019) | 10.1103/PhysRevD.100.121901 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the standard Hamiltonian of isotropic loop quantum cosmology is
selected by physical criteria plus one choice: that it have a `minimal' number
of terms. We also show the freedom, and boundedness of energy density, even
when this choice is relaxed. A criterion used is covariance under dilations,
the conti... | [
{
"created": "Mon, 4 Feb 2019 18:53:25 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Feb 2019 19:10:40 GMT",
"version": "v2"
}
] | 2019-12-25 | [
[
"Engle",
"Jonathan",
""
],
[
"Vilensky",
"Ilya",
""
]
] | We show that the standard Hamiltonian of isotropic loop quantum cosmology is selected by physical criteria plus one choice: that it have a `minimal' number of terms. We also show the freedom, and boundedness of energy density, even when this choice is relaxed. A criterion used is covariance under dilations, the continu... |
1007.2499 | Mehrdad Farhoudi Dr. | Behrooz Malekolkalami and Mehrdad Farhoudi | Noncommutative Double Scalar Fields in FRW Cosmology as Cosmical
Oscillators | 21 pages, 5 figures | Class.Quant.Grav.27:245009,2010 | 10.1088/0264-9381/27/24/245009 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate effects of noncommutativity of phase space generated by two
scalar fields conformally coupled to curvature in FRW cosmology. We restrict
deformation of minisuperspace to noncommutativity between scalar fields and
between their canonical conjugate momenta. The investigation is carried out by
means of co... | [
{
"created": "Thu, 15 Jul 2010 08:06:15 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Nov 2010 16:57:20 GMT",
"version": "v2"
}
] | 2010-11-30 | [
[
"Malekolkalami",
"Behrooz",
""
],
[
"Farhoudi",
"Mehrdad",
""
]
] | We investigate effects of noncommutativity of phase space generated by two scalar fields conformally coupled to curvature in FRW cosmology. We restrict deformation of minisuperspace to noncommutativity between scalar fields and between their canonical conjugate momenta. The investigation is carried out by means of comp... |
1311.2379 | Salvador Robles-Perez | Salvador J. Robles-P\'erez | Creation of entangled universes avoids the big bang singularity | 11 pages, 5 figures | Journal of Gravity (2014), 382675 | 10.1155/2014/382675 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The creation of universes in entangled pairs may avoid the initial
singularity and it would have observable consequences in a large macroscopic
universe like ours, at least in principle. In this paper we describe the
creation of an entangled pair of universes from a double instanton, which
avoids the initial singular... | [
{
"created": "Mon, 11 Nov 2013 08:34:22 GMT",
"version": "v1"
}
] | 2017-08-04 | [
[
"Robles-Pérez",
"Salvador J.",
""
]
] | The creation of universes in entangled pairs may avoid the initial singularity and it would have observable consequences in a large macroscopic universe like ours, at least in principle. In this paper we describe the creation of an entangled pair of universes from a double instanton, which avoids the initial singularit... |
1310.5115 | Theodore A. Jacobson | Ted Jacobson | Undoing the twist: the Ho\v{r}ava limit of Einstein-aether | 5 pages; v2: added discussion of inferences from the general form of
the action, changed normalization of expansion coupling coefficient to
simplify formulas, nearly coincides with PRD version | null | 10.1103/PhysRevD.89.081501 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that Ho\v{r}ava gravity can be obtained from Einstein-aether theory
in the limit that the twist coupling constant goes to infinity, while holding
fixed the expansion, shear and acceleration couplings. This limit helps to
clarify the relation between the two theories, and allows Ho\v{r}ava results to
be obtain... | [
{
"created": "Fri, 18 Oct 2013 18:10:42 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Mar 2014 19:50:28 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"Jacobson",
"Ted",
""
]
] | We show that Ho\v{r}ava gravity can be obtained from Einstein-aether theory in the limit that the twist coupling constant goes to infinity, while holding fixed the expansion, shear and acceleration couplings. This limit helps to clarify the relation between the two theories, and allows Ho\v{r}ava results to be obtained... |
1508.06986 | Nicholas Tacik | Nick Tacik, Francois Foucart, Harald P. Pfeiffer, Roland Haas, Serguei
Ossokine, Jeff Kaplan, Curran Muhlberger, Matt D. Duez, Lawrence E. Kidder,
Mark A. Scheel, B\'ela Szil\'agyi | Binary Neutron Stars with Arbitrary Spins in Numerical Relativity | 20 pages, 22 figures | Phys. Rev. D 92, 124012 (2015) | 10.1103/PhysRevD.92.124012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a code to construct initial data for binary neutron star systems
in which the stars are rotating. Our code, based on a formalism developed by
Tichy, allows for arbitrary rotation axes of the neutron stars and is able to
achieve rotation rates near rotational breakup. We compute the neutron star
angular mom... | [
{
"created": "Thu, 27 Aug 2015 19:56:36 GMT",
"version": "v1"
}
] | 2016-08-08 | [
[
"Tacik",
"Nick",
""
],
[
"Foucart",
"Francois",
""
],
[
"Pfeiffer",
"Harald P.",
""
],
[
"Haas",
"Roland",
""
],
[
"Ossokine",
"Serguei",
""
],
[
"Kaplan",
"Jeff",
""
],
[
"Muhlberger",
"Curran",
""
],
... | We present a code to construct initial data for binary neutron star systems in which the stars are rotating. Our code, based on a formalism developed by Tichy, allows for arbitrary rotation axes of the neutron stars and is able to achieve rotation rates near rotational breakup. We compute the neutron star angular momen... |
gr-qc/9907039 | Brandon Carter | Brandon Carter | Vortex Dynamics in Superfluids | 39 pages, Latex; contrib. to `Topological defects and non-equilibrium
dynamics of phase transitions' ed Y. Bunkov, H. Godfrin, Les Houches Winter
School, February 1999 | null | null | null | gr-qc | null | Superfluid condensates are known to occur in contexts ranging from laboratory
liquid helium to neutron stars, and are also likely to occur in cosmological
phenomena such as axion fields. In the zero temperature limit, such condensates
are describable at a mesoscopic level by irrotational configurations of simple
rela... | [
{
"created": "Fri, 9 Jul 1999 14:08:43 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Carter",
"Brandon",
""
]
] | Superfluid condensates are known to occur in contexts ranging from laboratory liquid helium to neutron stars, and are also likely to occur in cosmological phenomena such as axion fields. In the zero temperature limit, such condensates are describable at a mesoscopic level by irrotational configurations of simple relati... |
0910.4073 | Christian L\"ubbe | C. L\"ubbe, J.A. Valiente Kroon | A stability result for purely radiative spacetimes | 25 pages, 4 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An existence and stability result for a class of purely radiative vacuum
spacetimes arising from hyperboloidal data is given. This result generalises
semiglobal existence results for Minkowski-like spacetimes to the case where
the reference solution contains gravitational radiation. The analysis makes use
of the exte... | [
{
"created": "Wed, 21 Oct 2009 12:37:26 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Lübbe",
"C.",
""
],
[
"Kroon",
"J. A. Valiente",
""
]
] | An existence and stability result for a class of purely radiative vacuum spacetimes arising from hyperboloidal data is given. This result generalises semiglobal existence results for Minkowski-like spacetimes to the case where the reference solution contains gravitational radiation. The analysis makes use of the extend... |
gr-qc/0611030 | Stefano Vitale | Ludovico Carbone, Giacomo Ciani, Rita Dolesi, Mauro Hueller, David
Tombolato, Stefano Vitale, and William Joseph Weber (Department of Physics,
University of Trento and INFN, Gruppo Collegato di Trento, Italy) Antonella
Cavalleri (Istituto di Fotonica e Nanotecnologie CNR-ITC and INFN Gruppo
Collegato di Trento,... | Upper limits to surface force disturbances on LISA proof masses and the
possibility of observing galactic binaries | 3 Figures. Submitted to Physical Review Letters | Phys.Rev.D75:042001,2007 | 10.1103/PhysRevD.75.042001 | null | gr-qc | null | We report on the measurement of parasitic surface force noise on a hollow
replica of a LISA (Laser Interferometer Space Antenna for the observation of
gravitational waves) proof mass surrounded by a faithful representation of its
in flight surroundings, namely the capacitive sensor used to detect proof-mass
motion. P... | [
{
"created": "Sun, 5 Nov 2006 09:15:18 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Nov 2006 09:23:59 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Carbone",
"Ludovico",
"",
"Department of Physics,\n University of Trento and INFN, Gruppo Collegato di Trento, Italy"
],
[
"Ciani",
"Giacomo",
"",
"Department of Physics,\n University of Trento and INFN, Gruppo Collegato di Trento, Italy"
],
[
"Dolesi",
"Rita",
... | We report on the measurement of parasitic surface force noise on a hollow replica of a LISA (Laser Interferometer Space Antenna for the observation of gravitational waves) proof mass surrounded by a faithful representation of its in flight surroundings, namely the capacitive sensor used to detect proof-mass motion. Par... |
1704.03340 | Pavel Friedrich | Tomislav Prokopec and Pavel Friedrich | Scalar field dark matter in hybrid approach | This version matches the one accepted for publication in Physical
Review D. There are some minor changes with respect to the previous version | Phys. Rev. D 96, 083504 (2017) | 10.1103/PhysRevD.96.083504 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a hybrid formalism suitable for modeling scalar field dark matter,
in which the phase-space distribution associated to the real scalar field is
modeled by statistical equal-time two-point functions and gravity is treated by
two stochastic gravitational fields in the longitudinal gauge (in this work we
negl... | [
{
"created": "Mon, 10 Apr 2017 14:54:27 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Sep 2017 12:00:55 GMT",
"version": "v2"
}
] | 2017-10-04 | [
[
"Prokopec",
"Tomislav",
""
],
[
"Friedrich",
"Pavel",
""
]
] | We develop a hybrid formalism suitable for modeling scalar field dark matter, in which the phase-space distribution associated to the real scalar field is modeled by statistical equal-time two-point functions and gravity is treated by two stochastic gravitational fields in the longitudinal gauge (in this work we neglec... |
2302.03704 | Conor Dyson | Conor Dyson, Maarten van de Meent | Kerr-fully Diving into the Abyss: Analytic Solutions to Plunging
Geodesics in Kerr | 22 pages, 7 Figures | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present closed-form solutions for plunging geodesics in the extended Kerr
spacetime using Boyer-Lindquist coordinates. Our solutions directly solve for
the dynamics of generic timelike plunges, we also specialise to the case of
test particles plunging from a precessing innermost stable circular orbit
(ISSO). We fi... | [
{
"created": "Tue, 7 Feb 2023 19:00:12 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Aug 2023 17:39:29 GMT",
"version": "v2"
}
] | 2023-08-15 | [
[
"Dyson",
"Conor",
""
],
[
"van de Meent",
"Maarten",
""
]
] | We present closed-form solutions for plunging geodesics in the extended Kerr spacetime using Boyer-Lindquist coordinates. Our solutions directly solve for the dynamics of generic timelike plunges, we also specialise to the case of test particles plunging from a precessing innermost stable circular orbit (ISSO). We find... |
1101.3591 | Ryan Lang | Ryan N. Lang, Scott A. Hughes, Neil J. Cornish | Measuring parameters of massive black hole binaries with partially
aligned spins | 18 pages, 16 figures, version accepted by PRD (with improved
distributions of partially aligned spins) | Phys.Rev.D84:022002,2011 | 10.1103/PhysRevD.84.022002 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The future space-based gravitational wave detector LISA will be able to
measure parameters of coalescing massive black hole binaries, often to
extremely high accuracy. Previous work has demonstrated that the black hole
spins can have a strong impact on the accuracy of parameter measurement.
Relativistic spin-induced ... | [
{
"created": "Wed, 19 Jan 2011 00:29:17 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Aug 2011 02:36:26 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Lang",
"Ryan N.",
""
],
[
"Hughes",
"Scott A.",
""
],
[
"Cornish",
"Neil J.",
""
]
] | The future space-based gravitational wave detector LISA will be able to measure parameters of coalescing massive black hole binaries, often to extremely high accuracy. Previous work has demonstrated that the black hole spins can have a strong impact on the accuracy of parameter measurement. Relativistic spin-induced pr... |
gr-qc/0605084 | Young-Jai Park | Wontae Kim, Yong-Wan Kim, and Young-Jai Park | Entropy of the Randall-Sundrum brane world with the generalized
uncertainty principle | 12 pages. The improved version published in Phys. Rev. D | Phys.Rev. D74 (2006) 104001 | 10.1103/PhysRevD.74.104001 | SOGANG-HEP 317/06 | gr-qc | null | By introducing the generalized uncertainty principle, we calculate the
entropy of the bulk scalar field on the Randall-Sundrum brane background
without any cutoff. We obtain the entropy of the massive scalar field
proportional to the horizon area. Here, we observe that the mass contribution
to the entropy exists in c... | [
{
"created": "Mon, 15 May 2006 06:24:54 GMT",
"version": "v1"
},
{
"created": "Sun, 21 May 2006 10:15:12 GMT",
"version": "v2"
},
{
"created": "Thu, 2 Nov 2006 02:39:28 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Kim",
"Wontae",
""
],
[
"Kim",
"Yong-Wan",
""
],
[
"Park",
"Young-Jai",
""
]
] | By introducing the generalized uncertainty principle, we calculate the entropy of the bulk scalar field on the Randall-Sundrum brane background without any cutoff. We obtain the entropy of the massive scalar field proportional to the horizon area. Here, we observe that the mass contribution to the entropy exists in con... |
2101.04152 | Peter Hess O | Peter Otto Hess | Observable consequences of pseudo-complex General Relativity | 32 pages, 10 figures, spscial issue: Classical Extensions and
Alternative Theories of Gravity, HINDAWI | null | null | null | gr-qc hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | A review of the pseudo-complex General Relativity (pc-GR) is presented, with
the emphasis on observational consequences. First it is argued why to use an
algebraic extension and why the pseudo-complex is a viable one. Afterward, the
pc-GR is formulated. Posterior, several observational consequences are
discussed, as ... | [
{
"created": "Mon, 11 Jan 2021 19:28:18 GMT",
"version": "v1"
}
] | 2021-01-13 | [
[
"Hess",
"Peter Otto",
""
]
] | A review of the pseudo-complex General Relativity (pc-GR) is presented, with the emphasis on observational consequences. First it is argued why to use an algebraic extension and why the pseudo-complex is a viable one. Afterward, the pc-GR is formulated. Posterior, several observational consequences are discussed, as th... |
1912.00591 | Rituparno Goswami | Rituparno Goswami, George F. R. Ellis | Tidal forces are gravitational waves | 16 pages, revtex4 | null | null | null | gr-qc astro-ph.EP astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we show in a covariant and gauge invariant way that in general
relativity, tidal forces are actually a hidden form of gravitational waves.
This must be so because gravitational effects cannot occur faster than the
speed of light. Any two body gravitating system, where the bodies are orbiting
around each... | [
{
"created": "Mon, 2 Dec 2019 06:34:14 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Sep 2020 08:56:01 GMT",
"version": "v2"
}
] | 2020-09-15 | [
[
"Goswami",
"Rituparno",
""
],
[
"Ellis",
"George F. R.",
""
]
] | In this paper we show in a covariant and gauge invariant way that in general relativity, tidal forces are actually a hidden form of gravitational waves. This must be so because gravitational effects cannot occur faster than the speed of light. Any two body gravitating system, where the bodies are orbiting around each o... |
1306.2055 | Behnam Pourhassan | J. Sadeghi, B. Pourhassan, and Z. Abbaspour Moghaddam | Interacting Entropy-Corrected Holographic Dark Energy and IR Cut-Off
Length | 13 pages, 2 figures added in revised version. References added | International Journal of Theoretical Physics 53 (2014) 125-135 | 10.1007/s10773-013-1790-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we consider holographic dark energy model with corrected
holographic energy density and show that this model may be equivalent to the
modified Chaplygin gas model. Then we obtain relation between entropy corrected
holographic dark energy model and scalar field models. We do these works by
using choices ... | [
{
"created": "Sun, 9 Jun 2013 19:26:42 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jun 2013 09:36:03 GMT",
"version": "v2"
}
] | 2014-01-13 | [
[
"Sadeghi",
"J.",
""
],
[
"Pourhassan",
"B.",
""
],
[
"Moghaddam",
"Z. Abbaspour",
""
]
] | In this paper we consider holographic dark energy model with corrected holographic energy density and show that this model may be equivalent to the modified Chaplygin gas model. Then we obtain relation between entropy corrected holographic dark energy model and scalar field models. We do these works by using choices of... |
gr-qc/0209058 | Soon-Tae Hong | Soon-Tae Hong, Jaedong Choi and Young-Jai Park | (2+1) dimensional black holes in warped product scheme | 13 pages | null | null | SOGANG-HEP 300/02 | gr-qc | null | Exploiting a multiply warped product manifold scheme, we study the interior
solutions of the Banados-Teitelboim-Zanelli black holes and the exterior
solutions of the de Sitter black holes in the (2+1) dimensions.
| [
{
"created": "Wed, 18 Sep 2002 10:11:28 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hong",
"Soon-Tae",
""
],
[
"Choi",
"Jaedong",
""
],
[
"Park",
"Young-Jai",
""
]
] | Exploiting a multiply warped product manifold scheme, we study the interior solutions of the Banados-Teitelboim-Zanelli black holes and the exterior solutions of the de Sitter black holes in the (2+1) dimensions. |
1103.3201 | Frank Reifler | Mayeul Arminjon and Frank Reifler | Equivalent forms of Dirac equations in curved spacetimes and generalized
de Broglie relations | PDF, 32 pages in referee format. Added significant material on
canonical forms of Dirac equations. Simplified Theorem 1 for normal Dirac
equations. Added section on Gordon decomposition of the probability current.
Encapsulated main results in the statement of Theorem 2 | Brazilian Journal of Physics 43, No. 1-2, 64-77 (2013) | 10.1007/s13538-012-0111-0 | null | gr-qc math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One may ask whether the relations between energy and frequency and between
momentum and wave vector, introduced for matter waves by de Broglie, are
rigorously valid in the presence of gravity. In this paper, we show this to be
true for Dirac equations in a background of gravitational and electromagnetic
fields. We fi... | [
{
"created": "Wed, 16 Mar 2011 15:33:48 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Nov 2011 19:18:42 GMT",
"version": "v2"
},
{
"created": "Fri, 20 Jan 2012 17:37:12 GMT",
"version": "v3"
},
{
"created": "Mon, 7 Jan 2013 18:57:29 GMT",
"version": "v4"
}
] | 2013-11-22 | [
[
"Arminjon",
"Mayeul",
""
],
[
"Reifler",
"Frank",
""
]
] | One may ask whether the relations between energy and frequency and between momentum and wave vector, introduced for matter waves by de Broglie, are rigorously valid in the presence of gravity. In this paper, we show this to be true for Dirac equations in a background of gravitational and electromagnetic fields. We firs... |
gr-qc/0407025 | Sergey G. Klimenko | S Klimenko, I Yakushin, M Rakhmanov and G Mitselmakher | Performance of the WaveBurst algorithm on LIGO data | proceedings of GWDAW, 2003 conference, 13 pages, 6 figures | Class.Quant.Grav.21:S1685-S1694,2004 | 10.1088/0264-9381/21/20/011 | LIGO-P040012-00-Z | gr-qc | null | In this paper we describe the performance of the WaveBurst algorithm which
was designed for detection of gravitational wave bursts in interferometric
data. The performance of the algorithm was evaluated on the test data set
collected during the second LIGO Scientific run. We have measured the false
alarm rate of the ... | [
{
"created": "Tue, 6 Jul 2004 21:57:32 GMT",
"version": "v1"
}
] | 2009-09-29 | [
[
"Klimenko",
"S",
""
],
[
"Yakushin",
"I",
""
],
[
"Rakhmanov",
"M",
""
],
[
"Mitselmakher",
"G",
""
]
] | In this paper we describe the performance of the WaveBurst algorithm which was designed for detection of gravitational wave bursts in interferometric data. The performance of the algorithm was evaluated on the test data set collected during the second LIGO Scientific run. We have measured the false alarm rate of the al... |
0901.2861 | Emilio Elizalde | Jaume Haro, Emilio Elizalde | Effective gravity formulation that avoids singularities in quantum FRW
cosmologies | 11 pages, no figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Assuming that time exists, a new, effective formulation of gravity is
introduced, which lies in between the Wheeler-DeWitt approach and ordinary QFT.
Remarkably, the Penrose-Hawking singularity of usual Friedman-Robertson-Walker
cosmologies is naturally avoided there. The theory is made explicit via
specific examples... | [
{
"created": "Mon, 19 Jan 2009 14:23:09 GMT",
"version": "v1"
}
] | 2009-01-20 | [
[
"Haro",
"Jaume",
""
],
[
"Elizalde",
"Emilio",
""
]
] | Assuming that time exists, a new, effective formulation of gravity is introduced, which lies in between the Wheeler-DeWitt approach and ordinary QFT. Remarkably, the Penrose-Hawking singularity of usual Friedman-Robertson-Walker cosmologies is naturally avoided there. The theory is made explicit via specific examples, ... |
1302.0375 | Silke Weinfurtner | Silke Weinfurtner, Edmund W. Tedford, Matthew C.J. Penrice, William G.
Unruh, and Gregory A. Lawrence | Classical aspects of Hawking radiation verified in analogue gravity
experiment | 17 pages, 10 figures; draft of a chapter submitted to the proceedings
of the IX'th SIGRAV graduate school: Analogue Gravity, Lake Como, Italy, May
2011 | null | 10.1007/978-3-319-00266-8_8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There is an analogy between the propagation of fields on a curved spacetime
and shallow water waves in an open channel flow. By placing a streamlined
obstacle into an open channel flow we create a region of high velocity over the
obstacle that can include wave horizons. Long (shallow water) waves propagating
upstream... | [
{
"created": "Sat, 2 Feb 2013 13:24:09 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Weinfurtner",
"Silke",
""
],
[
"Tedford",
"Edmund W.",
""
],
[
"Penrice",
"Matthew C. J.",
""
],
[
"Unruh",
"William G.",
""
],
[
"Lawrence",
"Gregory A.",
""
]
] | There is an analogy between the propagation of fields on a curved spacetime and shallow water waves in an open channel flow. By placing a streamlined obstacle into an open channel flow we create a region of high velocity over the obstacle that can include wave horizons. Long (shallow water) waves propagating upstream t... |
1912.06494 | Saibal Ray | Rikpratik Sengupta, Prasenjit Paul, Bikash Chandra Paul and Saibal Ray | Inflation in anisotropic brane universe using tachyon field | 15 pages, 5 figures, Accepted in IJMPD | International Journal of Modern Physics D Vol. 28, No. 13, 1941010
(2019) | 10.1142/S0218271819410104 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmological solution to the gravitational field equations in the generalized
Randall-Sundrum model for an anisotropic brane with Bianchi I geometry and
perfect fluid as matter sources has been considered. The matter on the brane is
described by a tachyonic field. The solution admits inflationary era and at a
later e... | [
{
"created": "Thu, 12 Dec 2019 07:22:11 GMT",
"version": "v1"
}
] | 2019-12-16 | [
[
"Sengupta",
"Rikpratik",
""
],
[
"Paul",
"Prasenjit",
""
],
[
"Paul",
"Bikash Chandra",
""
],
[
"Ray",
"Saibal",
""
]
] | Cosmological solution to the gravitational field equations in the generalized Randall-Sundrum model for an anisotropic brane with Bianchi I geometry and perfect fluid as matter sources has been considered. The matter on the brane is described by a tachyonic field. The solution admits inflationary era and at a later epo... |
2209.11374 | Hyeong-Chan Kim | Hyeong-Chan Kim | Particle creations in a variational formulation of relativistic
thermodynamics with dissipation | 6 pages, No figure | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In modeling relativistic thermodynamics, we frequently regard the particle
number as a conserved quantity. The number conservation law, which comes from
the requirement that the pull-back construction from fluid-matter 3-space has
the same degrees of freedom as the number of independent components of the
four-dimensi... | [
{
"created": "Fri, 23 Sep 2022 02:27:01 GMT",
"version": "v1"
}
] | 2022-09-26 | [
[
"Kim",
"Hyeong-Chan",
""
]
] | In modeling relativistic thermodynamics, we frequently regard the particle number as a conserved quantity. The number conservation law, which comes from the requirement that the pull-back construction from fluid-matter 3-space has the same degrees of freedom as the number of independent components of the four-dimension... |
2303.07349 | Gamal G.L. Nashed | G. G. L. Nashed and Shin'ichi Nojiri | Slow-rotating charged black hole solution in dynamical Chern-Simons
modified gravity | 20 pages 3 figures, will appear in Phys. Rev. D | null | 10.1103/PhysRevD.107.064069 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | The Chern-Simons (CS) gravity is a modified theory of Einstein's general
relativity (GR). The CS theory arises from the low energy limit of string
theory which involves anomaly correction to the Einstein-Hilbert action. The CS
term is given by the product of the Pontryagin density with a scalar field. In
this study, ... | [
{
"created": "Sat, 11 Mar 2023 06:55:27 GMT",
"version": "v1"
}
] | 2023-04-12 | [
[
"Nashed",
"G. G. L.",
""
],
[
"Nojiri",
"Shin'ichi",
""
]
] | The Chern-Simons (CS) gravity is a modified theory of Einstein's general relativity (GR). The CS theory arises from the low energy limit of string theory which involves anomaly correction to the Einstein-Hilbert action. The CS term is given by the product of the Pontryagin density with a scalar field. In this study, we... |
0906.3278 | Miguel Angel Garcia Aspeitia | Miguel Angel Garcia Aspeitia and Tonatiuh Matos | The Universe Dynamics from Topological Considerations | 8 pages, 1 figure, Third report new version | Gen.Rel.Grav.43:315-329,2011 | 10.1007/s10714-010-1093-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the possibility that the dynamics of the universe can be
reproduced choosing appropriately the initial global topology of the Universe.
In this work we start with two concentric spherical three-dimensional branes
S^3, with radius a_1<a_2 immersed in a five-dimensional space-time. The novel
feature of this ... | [
{
"created": "Wed, 17 Jun 2009 19:03:22 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Nov 2009 16:59:19 GMT",
"version": "v2"
},
{
"created": "Sun, 30 May 2010 13:26:40 GMT",
"version": "v3"
}
] | 2011-02-07 | [
[
"Aspeitia",
"Miguel Angel Garcia",
""
],
[
"Matos",
"Tonatiuh",
""
]
] | We explore the possibility that the dynamics of the universe can be reproduced choosing appropriately the initial global topology of the Universe. In this work we start with two concentric spherical three-dimensional branes S^3, with radius a_1<a_2 immersed in a five-dimensional space-time. The novel feature of this mo... |
gr-qc/0505068 | Daniel R. Terno | Daniel R. Terno | From qubits to black holes: entropy, entanglement and all that | Honorable Mention in the 2005 Gravity Research Foundation Essay
Competition | Int.J.Mod.Phys. D14 (2005) 2307-2314 | 10.1142/S0218271805007802 | null | gr-qc hep-th quant-ph | null | Entropy plays a crucial role in characterization of information and
entanglement, but it is not a scalar quantity and for many systems it is
different for different relativistic observers. Loop quantum gravity predicts
the Bekenstein-Hawking term for black hole entropy and logarithmic correction
to it. The latter ori... | [
{
"created": "Fri, 13 May 2005 14:19:20 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Terno",
"Daniel R.",
""
]
] | Entropy plays a crucial role in characterization of information and entanglement, but it is not a scalar quantity and for many systems it is different for different relativistic observers. Loop quantum gravity predicts the Bekenstein-Hawking term for black hole entropy and logarithmic correction to it. The latter origi... |
1906.02231 | Martin Bojowald | Martin Bojowald | Non-bouncing solutions in loop quantum cosmology | 24 pages | JCAP 07 (2020) 029 | 10.1088/1475-7516/2020/07/029 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | According to the Belinskii-Khalatnikov-Lifshitz scenario, a collapsing
universe approaching a spacelike singularity can be approximated by homogeneous
cosmological dynamics, but only if asymptotically small spatial regions are
considered. It is shown here that the relevant small-volume behavior in
solvable models of ... | [
{
"created": "Wed, 5 Jun 2019 18:15:18 GMT",
"version": "v1"
}
] | 2020-07-16 | [
[
"Bojowald",
"Martin",
""
]
] | According to the Belinskii-Khalatnikov-Lifshitz scenario, a collapsing universe approaching a spacelike singularity can be approximated by homogeneous cosmological dynamics, but only if asymptotically small spatial regions are considered. It is shown here that the relevant small-volume behavior in solvable models of lo... |
1907.13604 | Eleni-Alexandra Kontou | Christopher J. Fewster and Eleni-Alexandra Kontou | A new derivation of singularity theorems with weakened energy hypotheses | 27 pages | null | 10.1088/1361-6382/ab685b | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The original singularity theorems of Penrose and Hawking were proved for
matter obeying the Null Energy Condition or Strong Energy Condition
respectively. Various authors have proved versions of these results under
weakened hypotheses, by considering the Riccati inequality obtained from
Raychaudhuri's equation. Here,... | [
{
"created": "Wed, 31 Jul 2019 17:07:32 GMT",
"version": "v1"
}
] | 2020-04-08 | [
[
"Fewster",
"Christopher J.",
""
],
[
"Kontou",
"Eleni-Alexandra",
""
]
] | The original singularity theorems of Penrose and Hawking were proved for matter obeying the Null Energy Condition or Strong Energy Condition respectively. Various authors have proved versions of these results under weakened hypotheses, by considering the Riccati inequality obtained from Raychaudhuri's equation. Here, w... |
2105.05653 | Iver Brevik | I. Brevik and A. V. Timoshkin | Holographic cosmology with two coupled fluids in the presence of
viscosity | 10 pages, no figures. To appear in Int. J. Geom. Meth. Mod. Phys | Int. J. Geom. Meth. Mod. Phys. 18, 2150149 (2021) | 10.1142/S0219887821501498 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We explore the cosmological models of the late-time universe based on the
holographic principle, taking into account the properties of the viscosity of
the dark fluid. We use the mathematical formalism of generalized infrared
cutoff holographic dark energy, as presented by Nojiri and Odintsov (2017). We
consider the ... | [
{
"created": "Wed, 12 May 2021 13:41:38 GMT",
"version": "v1"
}
] | 2021-08-11 | [
[
"Brevik",
"I.",
""
],
[
"Timoshkin",
"A. V.",
""
]
] | We explore the cosmological models of the late-time universe based on the holographic principle, taking into account the properties of the viscosity of the dark fluid. We use the mathematical formalism of generalized infrared cutoff holographic dark energy, as presented by Nojiri and Odintsov (2017). We consider the Li... |
2202.04360 | Pietro Dona | Pietro Dona and Pietropaolo Frisoni | How-To compute EPRL spin foam amplitudes | 28 pages with many colored figures. Paper published in the special
issue "Probing the Quantum Space-Time" of Universe. v-2 Added introductory
section. Matching published version. [QISS] | Universe 2022, 8(4), 208 | 10.3390/universe8040208 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spin foam theory is a concrete framework for quantum gravity where numerical
calculations of transition amplitudes are possible. Recently, the field became
very active, but the entry barrier is steep, mainly because of its unusual
language and notions scattered around the literature. This paper is a
pedagogical guide... | [
{
"created": "Wed, 9 Feb 2022 09:45:08 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Mar 2022 11:34:51 GMT",
"version": "v2"
},
{
"created": "Fri, 16 Sep 2022 13:19:22 GMT",
"version": "v3"
}
] | 2022-09-19 | [
[
"Dona",
"Pietro",
""
],
[
"Frisoni",
"Pietropaolo",
""
]
] | Spin foam theory is a concrete framework for quantum gravity where numerical calculations of transition amplitudes are possible. Recently, the field became very active, but the entry barrier is steep, mainly because of its unusual language and notions scattered around the literature. This paper is a pedagogical guide t... |
1011.0623 | Hyeyoun Chung | Hyeyoun Chung | Dynamics of Diffeomorphism Degrees of Freedom at a Horizon | 12 pages. Final version accepted for publication in Physical Review D | Phys.Rev.D83:084017,2011 | 10.1103/PhysRevD.83.084017 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We define a set of boundary conditions that ensure the presence of a null
hypersurface with the essential characteristics of a horizon, using the
formalism of weakly isolated horizons as a guide. We then determine the
diffeomorphisms that preserve these boundary conditions, and derive a dynamical
action for these dif... | [
{
"created": "Tue, 2 Nov 2010 14:14:28 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Nov 2010 19:14:56 GMT",
"version": "v2"
},
{
"created": "Sat, 19 Mar 2011 12:42:15 GMT",
"version": "v3"
}
] | 2011-04-22 | [
[
"Chung",
"Hyeyoun",
""
]
] | We define a set of boundary conditions that ensure the presence of a null hypersurface with the essential characteristics of a horizon, using the formalism of weakly isolated horizons as a guide. We then determine the diffeomorphisms that preserve these boundary conditions, and derive a dynamical action for these diffe... |
1908.10022 | Rafael Sorkin | Rafael D. Sorkin | Lorentzian angles and trigonometry including lightlike vectors | Version 2 has figures in final form. 39 pages, 12 figures. Most
current version will be available at
http://www.perimeterinstitute.ca/personal/rsorkin/some.papers/ (or wherever
my home-page may be) | null | null | null | gr-qc hep-lat hep-th math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We define a concept of Lorentzian angle that works even when one or both of
the directions involved is null (lightlike). Such angles play a role in
Regge-Calculus, in the boundary- and corner- terms for the gravitational
action, and in the Lorentzian Gauss-Bonnet theorem (for which we provide a
proof).
| [
{
"created": "Tue, 27 Aug 2019 04:36:26 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Feb 2020 04:58:42 GMT",
"version": "v2"
}
] | 2020-02-07 | [
[
"Sorkin",
"Rafael D.",
""
]
] | We define a concept of Lorentzian angle that works even when one or both of the directions involved is null (lightlike). Such angles play a role in Regge-Calculus, in the boundary- and corner- terms for the gravitational action, and in the Lorentzian Gauss-Bonnet theorem (for which we provide a proof). |
1904.13252 | Christian Corda Prof. | Christian Corda | Mossbauer rotor experiment as new proof of general relativity: Rigorous
computation of the additional effect of clock synchronization | 17 pages, 1 figure.This final version matches the one published in
Int. Jour. Mod. Phys D. This paper is a rebuttal to the various versions of
arXiv:1610.04219. Some issues in arXiv:1602.04212 and arXiv:1502.04911 have
been partially reviewed | Int. Jour. Mod. Phys. D 28 (10), 1950131 (2019) | 10.1142/S0218271819501311 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We received an Honorable Mention at the Gravity Research Foundation 2018
Awards for Essays on Gravitation by showing that a correct general relativistic
interpretation of the Mossbauer rotor experiment represents a new, strong and
independent, proof of Einstein's general theory relativity (GTR). Here we
correct a mis... | [
{
"created": "Mon, 29 Apr 2019 15:33:07 GMT",
"version": "v1"
},
{
"created": "Mon, 20 May 2019 08:04:34 GMT",
"version": "v2"
},
{
"created": "Tue, 18 Jun 2019 08:25:38 GMT",
"version": "v3"
},
{
"created": "Wed, 19 Jun 2019 09:47:39 GMT",
"version": "v4"
}
] | 2019-07-29 | [
[
"Corda",
"Christian",
""
]
] | We received an Honorable Mention at the Gravity Research Foundation 2018 Awards for Essays on Gravitation by showing that a correct general relativistic interpretation of the Mossbauer rotor experiment represents a new, strong and independent, proof of Einstein's general theory relativity (GTR). Here we correct a mista... |
2304.10318 | Leonardo Modesto | Zhe Zhao and Leonardo Modesto | Quantum avoidance of G\"{o}del's closed timelike curves | 13 pages | null | 10.1140/epjc/s10052-023-11694-6 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a large class of nonlocal as well as local higher derivative theories
minimally coupled to the matter sector, we investigate the exactness of two
different classes of homogeneous G\"{o}del-type solutions, which may or may not
allow closed time-like curves (CTC). Our analysis is limited to spacetimes
solving the Ei... | [
{
"created": "Thu, 20 Apr 2023 13:51:08 GMT",
"version": "v1"
}
] | 2023-07-05 | [
[
"Zhao",
"Zhe",
""
],
[
"Modesto",
"Leonardo",
""
]
] | In a large class of nonlocal as well as local higher derivative theories minimally coupled to the matter sector, we investigate the exactness of two different classes of homogeneous G\"{o}del-type solutions, which may or may not allow closed time-like curves (CTC). Our analysis is limited to spacetimes solving the Eins... |
0705.0881 | Vladimir Ivashchuk | V. D. Ivashchuk | S-brane solutions with orthogonal intersection rules | 10 pages, Latex, invited paper to a fest of A. Garsia; typo in eq.
(3.4) is eliminated | Gen.Rel.Grav.37:751-758,2005 | 10.1007/s10714-005-0070-7 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A family of generalized composite intersecting S-brane solutions with
orthogonal intersection rules is described.
| [
{
"created": "Mon, 7 May 2007 11:00:36 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Oct 2011 16:29:45 GMT",
"version": "v2"
}
] | 2011-11-01 | [
[
"Ivashchuk",
"V. D.",
""
]
] | A family of generalized composite intersecting S-brane solutions with orthogonal intersection rules is described. |
2404.05597 | Iver Brevik | I. Brevik and A. V. Timoshkin | Little Rip and Pseudo Rip cosmological models with coupled dark energy
based on a new generalized entropy | 8 pages latex, no figures, to appear in Int. J. Geom. Meth. Mod. Phys | Int. J. Geom. Meth. Mod. Phys. (2024) 2450181 (12 pages) | 10.1142/S0219887824501810 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study Little Rip (LR) and Pseudo Rip (PR) cosmological models containing
two coupled fluids: dark energy and dark matter. We assume a spatially flat
Friedmann-Robertson-Walker (FRW) universe. The interaction between the dark
energy and the dark matter fluid components is described in terms of the
parameters in the... | [
{
"created": "Mon, 8 Apr 2024 15:17:37 GMT",
"version": "v1"
}
] | 2024-05-07 | [
[
"Brevik",
"I.",
""
],
[
"Timoshkin",
"A. V.",
""
]
] | We study Little Rip (LR) and Pseudo Rip (PR) cosmological models containing two coupled fluids: dark energy and dark matter. We assume a spatially flat Friedmann-Robertson-Walker (FRW) universe. The interaction between the dark energy and the dark matter fluid components is described in terms of the parameters in the g... |
1901.09599 | Michele Arzano | Michele Arzano, Lennart Brocki, Jerzy Kowalski-Glikman, Marco Letizia,
Josua Unger | Quantum ergosphere and brick wall entropy | 10 pages, no figures | null | 10.1016/j.physletb.2019.134887 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the "brick wall" model for black hole entropy taking into account
back-reaction effects on the horizon structure. We do so by adopting an
evaporating metric in the quasi-static approximation in which departures from
the standard Schwarzschild metric are governed by a small luminosity factor.
One of the eff... | [
{
"created": "Mon, 28 Jan 2019 11:06:52 GMT",
"version": "v1"
}
] | 2019-09-04 | [
[
"Arzano",
"Michele",
""
],
[
"Brocki",
"Lennart",
""
],
[
"Kowalski-Glikman",
"Jerzy",
""
],
[
"Letizia",
"Marco",
""
],
[
"Unger",
"Josua",
""
]
] | We revisit the "brick wall" model for black hole entropy taking into account back-reaction effects on the horizon structure. We do so by adopting an evaporating metric in the quasi-static approximation in which departures from the standard Schwarzschild metric are governed by a small luminosity factor. One of the effec... |
2407.20779 | Saeed Noori Gashti | Jafar Sadeghi, Mohammad Ali S. Afshar, Mohammad Reza Alipour, Saeed
Noori Gashti | Phase Transition Dynamics of Black Holes Influenced by Kaniadakis and
Barrow Statistics | 20 pages, 9 figures | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this study, we investigate the dynamics and frame-by-frame phase
transition of the first order in black hole thermodynamics. For our analysis,
we will utilize the Kramers escape rate. Our focus is on charged anti-de Sitter
(AdS) black holes influenced by Kaniadakis and Barrow statistics. The selection
of these bla... | [
{
"created": "Tue, 30 Jul 2024 12:33:04 GMT",
"version": "v1"
}
] | 2024-07-31 | [
[
"Sadeghi",
"Jafar",
""
],
[
"Afshar",
"Mohammad Ali S.",
""
],
[
"Alipour",
"Mohammad Reza",
""
],
[
"Gashti",
"Saeed Noori",
""
]
] | In this study, we investigate the dynamics and frame-by-frame phase transition of the first order in black hole thermodynamics. For our analysis, we will utilize the Kramers escape rate. Our focus is on charged anti-de Sitter (AdS) black holes influenced by Kaniadakis and Barrow statistics. The selection of these black... |
2309.05439 | Alesandro Santos | J. C. R. de Souza and A. F. Santos | An axially symmetric spacetime with causality violation in Ricci-inverse
gravity | 11 pages, accepted for publication in EPJC | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper, Ricci-inverse gravity is investigated. It is an alternative
theory of gravity that introduces into the Einstein-Hilbert action an
anti-curvature scalar that is obtained from the anti-curvature tensor which is
the inverse of the Ricci tensor. An axially symmetric spacetime with causality
violation is st... | [
{
"created": "Mon, 11 Sep 2023 13:25:22 GMT",
"version": "v1"
}
] | 2023-09-12 | [
[
"de Souza",
"J. C. R.",
""
],
[
"Santos",
"A. F.",
""
]
] | In this paper, Ricci-inverse gravity is investigated. It is an alternative theory of gravity that introduces into the Einstein-Hilbert action an anti-curvature scalar that is obtained from the anti-curvature tensor which is the inverse of the Ricci tensor. An axially symmetric spacetime with causality violation is stud... |
2211.08032 | Tuan Do | Duy H. Nguyen, Tuyen M. Pham, Thien D. Le, Tuan Q. Do | Anisotropic constant-roll k-inflation model | 15 pages, 11 figures. To appear in Communications in Physics (2023),
a well-established physics journal of Vietnam. Comments are welcome | Communications in Physics 33, 15 (2023) | 10.15625/0868-3166/17360 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we would like to figure out whether a k-inflation model admits
the Bianchi type I metric as its inflationary solution under a constant-roll
condition in the presence of the supergravity motivated coupling between scalar
and vector fields, $f^2(\phi)F_{\mu\nu}F^{\mu\nu}$. As a result, some novel
anisotr... | [
{
"created": "Tue, 15 Nov 2022 10:33:47 GMT",
"version": "v1"
}
] | 2023-04-03 | [
[
"Nguyen",
"Duy H.",
""
],
[
"Pham",
"Tuyen M.",
""
],
[
"Le",
"Thien D.",
""
],
[
"Do",
"Tuan Q.",
""
]
] | In this paper, we would like to figure out whether a k-inflation model admits the Bianchi type I metric as its inflationary solution under a constant-roll condition in the presence of the supergravity motivated coupling between scalar and vector fields, $f^2(\phi)F_{\mu\nu}F^{\mu\nu}$. As a result, some novel anisotrop... |
2004.00039 | Javier Rubio | Javier Rubio | Scale symmetry, the Higgs and the Cosmos | 14 pages, 5 figures. Invited talk in Corfu Summer Institute 2019
"School and Workshops on Elementary Particle Physics and Gravity"
(CORFU2019), based on 1712.04956 [astro-ph.CO] and 1811.05984 [astro-ph.CO] | null | null | HIP-2020-8/TH | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I review the Higgs-Dilaton model: a scale-invariant extension of the Standard
Model and gravity able to support inflation and dark energy with just an
additional degree of freedom on top of the Standard Model content. Potential
extensions of the simplest realization on the basis of transverse
diffeomorphisms are also... | [
{
"created": "Tue, 31 Mar 2020 18:12:04 GMT",
"version": "v1"
}
] | 2020-04-03 | [
[
"Rubio",
"Javier",
""
]
] | I review the Higgs-Dilaton model: a scale-invariant extension of the Standard Model and gravity able to support inflation and dark energy with just an additional degree of freedom on top of the Standard Model content. Potential extensions of the simplest realization on the basis of transverse diffeomorphisms are also d... |
gr-qc/0102071 | Gabriel Nagy | Robert Geroch, Gabriel Nagy, Oscar Reula | Relativistic Lagrange Formulation | 34 pages, no figures, accepted in J. Math. Phys | J.Math.Phys.42:3789-3808,2001 | 10.1063/1.1364502 | null | gr-qc | null | It is well-known that the equations for a simple fluid can be cast into what
is called their Lagrange formulation. We introduce a notion of a generalized
Lagrange formulation, which is applicable to a wide variety of systems of
partial differential equations. These include numerous systems of physical
interest, in pa... | [
{
"created": "Wed, 14 Feb 2001 22:55:46 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Geroch",
"Robert",
""
],
[
"Nagy",
"Gabriel",
""
],
[
"Reula",
"Oscar",
""
]
] | It is well-known that the equations for a simple fluid can be cast into what is called their Lagrange formulation. We introduce a notion of a generalized Lagrange formulation, which is applicable to a wide variety of systems of partial differential equations. These include numerous systems of physical interest, in part... |
0803.4006 | Sandro Costa | Sandro Silva e Costa | An entirely analytical cosmological model | 4 pages (revtex4), 4 figures | Mod.Phys.Lett.A24:531-540,2009 | 10.1142/S021773230902845X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The purpose of the present study is to show that in a particular cosmological
model, with an affine equation of state, one can obtain, besides the background
given by the scale factor, Hubble and deceleration parameters, a representation
in terms of scalar fields and, more important, explicit mathematical
expressions... | [
{
"created": "Fri, 28 Mar 2008 17:43:47 GMT",
"version": "v1"
}
] | 2009-04-17 | [
[
"Costa",
"Sandro Silva e",
""
]
] | The purpose of the present study is to show that in a particular cosmological model, with an affine equation of state, one can obtain, besides the background given by the scale factor, Hubble and deceleration parameters, a representation in terms of scalar fields and, more important, explicit mathematical expressions f... |
1411.5613 | Georgios K. Karananas Mr. | Georgios K. Karananas | The particle spectrum of parity-violating Poincar\'e gravitational
theory | v3: erratum discussing contradiction in ghost-free conditions
appended | 2015 Class. Quantum Grav. 32 055012 | 10.1088/0264-9381/32/5/055012 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we investigate the physical spectrum of the gravitational
theory based on the Poincar\'e group with terms which are at most quadratic in
tetrad and spin connection, allowing for the presence of parity-even as well as
parity-odd invariants. We determine restrictions on the parameters of the
action so tha... | [
{
"created": "Thu, 20 Nov 2014 17:28:58 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Feb 2015 10:11:45 GMT",
"version": "v2"
},
{
"created": "Wed, 18 Feb 2015 08:37:45 GMT",
"version": "v3"
}
] | 2015-02-19 | [
[
"Karananas",
"Georgios K.",
""
]
] | In this paper we investigate the physical spectrum of the gravitational theory based on the Poincar\'e group with terms which are at most quadratic in tetrad and spin connection, allowing for the presence of parity-even as well as parity-odd invariants. We determine restrictions on the parameters of the action so that ... |
2406.13132 | W. S. Hipolito-Ricaldi | J.A.S.Fortunato, W.S. Hipolito-Ricaldi, N. Videla, and J.R. Villanueva | Cosmic slowing down of acceleration with the Chaplygin-Jacobi gas as a
dark fluid | 16 pages, 5 figures | null | null | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by-nc-nd/4.0/ | A particular generalization of the Chaplygin inflationary model, using the
formalism of Hamilton-Jacobi and elliptic functions, results in a more general
non-linear Chaplygin-type equation of state (Chaplygin-Jacobi model). We
investigate the implementation of this model as a dark energy (DE) fluid to
explain the rec... | [
{
"created": "Wed, 19 Jun 2024 00:52:42 GMT",
"version": "v1"
}
] | 2024-06-21 | [
[
"Fortunato",
"J. A. S.",
""
],
[
"Hipolito-Ricaldi",
"W. S.",
""
],
[
"Videla",
"N.",
""
],
[
"Villanueva",
"J. R.",
""
]
] | A particular generalization of the Chaplygin inflationary model, using the formalism of Hamilton-Jacobi and elliptic functions, results in a more general non-linear Chaplygin-type equation of state (Chaplygin-Jacobi model). We investigate the implementation of this model as a dark energy (DE) fluid to explain the recen... |
2010.07609 | Alessandro Casalino | Alessandro Casalino, Bruno Sanna, Lorenzo Sebastiani, Sergio Zerbini | Bounce Models within Teleparallel modified gravity | 13 pages, version accepted for publication on PRD | Phys. Rev. D 103, 023514 (2021) | 10.1103/PhysRevD.103.023514 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, working in a Friedman-Lemaitre-Robertson-Walker (FLRW), first,
in the flat case, we recover the generalized Friedman equation of Quantum Loop
cosmology, and therefore the cosmological bounce, in the framework of modified
teleparallel gravity $f(T)$-model, $T$ being the torsion scalar introduced in
tele... | [
{
"created": "Thu, 15 Oct 2020 09:11:46 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jan 2021 09:49:57 GMT",
"version": "v2"
}
] | 2021-01-20 | [
[
"Casalino",
"Alessandro",
""
],
[
"Sanna",
"Bruno",
""
],
[
"Sebastiani",
"Lorenzo",
""
],
[
"Zerbini",
"Sergio",
""
]
] | In this paper, working in a Friedman-Lemaitre-Robertson-Walker (FLRW), first, in the flat case, we recover the generalized Friedman equation of Quantum Loop cosmology, and therefore the cosmological bounce, in the framework of modified teleparallel gravity $f(T)$-model, $T$ being the torsion scalar introduced in telepa... |
1710.00839 | Markus B. Fr\"ob | Markus B. Fr\"ob | Gauge-invariant quantum gravitational corrections to correlation
functions | 34 pages, 1 figure, matches published version | Class. Quant. Grav. 35 (2018) 055006 | 10.1088/1361-6382/aaa74c | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recent proposal for gauge-invariant observables in inflation [R. Brunetti
et al., JHEP 1608 (2016) 032] is examined. We give a generalisation of their
construction to general background spacetimes. In flat space, we calculate
one-loop graviton corrections to a scalar two-point function in a general gauge
for the gr... | [
{
"created": "Mon, 2 Oct 2017 18:00:19 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Feb 2018 14:01:51 GMT",
"version": "v2"
}
] | 2018-02-02 | [
[
"Fröb",
"Markus B.",
""
]
] | A recent proposal for gauge-invariant observables in inflation [R. Brunetti et al., JHEP 1608 (2016) 032] is examined. We give a generalisation of their construction to general background spacetimes. In flat space, we calculate one-loop graviton corrections to a scalar two-point function in a general gauge for the grav... |
0911.1187 | Tomohiro Harada | Tomohiro Harada, Umpei Miyamoto, Naoki Tsukamoto | Uniqueness of static spherically symmetric vacuum solutions in the IR
limit of Ho\v{r}ava-Lifshitz gravity | 10 pages, accepted for publication in International Journal of Modern
Physics D | Int.J.Mod.Phys.D20:111-118,2011 | 10.1142/S0218271811018652 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate static spherically symmetric vacuum solutions in the IR limit
of projectable nonrelativistic quantum gravity, including the renormalisable
quantum gravity recently proposed by Ho\v{r}ava. It is found that the
projectability condition plays an important role. Without the cosmological
constant, the space... | [
{
"created": "Fri, 6 Nov 2009 07:32:12 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Apr 2010 08:11:22 GMT",
"version": "v2"
},
{
"created": "Mon, 18 Oct 2010 02:28:38 GMT",
"version": "v3"
}
] | 2011-03-04 | [
[
"Harada",
"Tomohiro",
""
],
[
"Miyamoto",
"Umpei",
""
],
[
"Tsukamoto",
"Naoki",
""
]
] | We investigate static spherically symmetric vacuum solutions in the IR limit of projectable nonrelativistic quantum gravity, including the renormalisable quantum gravity recently proposed by Ho\v{r}ava. It is found that the projectability condition plays an important role. Without the cosmological constant, the spaceti... |
2006.05287 | Nikolay Fimin N | Victor Vedenyapin, Nikolay Fimin and Valery Chechetkin | The properties of Vlasov-Maxwell-Einstein equations and its applications
to cosmological models | null | European Physical Journal Plus (2020) 135: 400 | 10.1140/epjp/s13360-020-00412-w | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The method of obtaining of Vlasov-type equations for systems of interacting
massive charged particles from the general relativistic Einstein-Hilbert action
is considered. An effective approach to synchronizing the proper times of
various particles of a many-particle system is proposed. Based on the resulting
expressi... | [
{
"created": "Tue, 9 Jun 2020 14:30:17 GMT",
"version": "v1"
}
] | 2020-06-11 | [
[
"Vedenyapin",
"Victor",
""
],
[
"Fimin",
"Nikolay",
""
],
[
"Chechetkin",
"Valery",
""
]
] | The method of obtaining of Vlasov-type equations for systems of interacting massive charged particles from the general relativistic Einstein-Hilbert action is considered. An effective approach to synchronizing the proper times of various particles of a many-particle system is proposed. Based on the resulting expression... |
1407.8167 | Steffen Gielen | Steffen Gielen, Daniele Oriti | Quantum cosmology from quantum gravity condensates: cosmological
variables and lattice-refined dynamics | 7 pages, APS style, revtex; v2: small changes in presentation,
results unchanged, matches journal version | New J. Phys. 16 (2014) 123004 | 10.1088/1367-2630/16/12/123004 | AEI-2014-032 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of group field theory condensate cosmology, we clarify the
extraction of cosmological variables from the microscopic quantum gravity
degrees of freedom. We show that an important implication of the second
quantized formalism is the dependence of cosmological variables and equations
on the quantum gravi... | [
{
"created": "Wed, 30 Jul 2014 19:36:29 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Nov 2014 00:31:14 GMT",
"version": "v2"
}
] | 2014-12-03 | [
[
"Gielen",
"Steffen",
""
],
[
"Oriti",
"Daniele",
""
]
] | In the context of group field theory condensate cosmology, we clarify the extraction of cosmological variables from the microscopic quantum gravity degrees of freedom. We show that an important implication of the second quantized formalism is the dependence of cosmological variables and equations on the quantum gravita... |
gr-qc/9601010 | Steve Brandt | Steven R. Brandt, Edward Seidel (National Center for Supercomputing
Applications, Department of Physics, Univ. of Illinois at Urbana-Champaign) | The Evolution of Distorted Rotating Black Holes III: Initial Data | 16 pages | Phys.Rev. D54 (1996) 1403-1416 | 10.1103/PhysRevD.54.1403 | null | gr-qc | null | In this paper we study a new family of black hole initial data sets
corresponding to distorted ``Kerr'' black holes with moderate rotation
parameters, and distorted Schwarzschild black holes with even- and odd-parity
radiation. These data sets build on the earlier rotating black holes of Bowen
and York and the distor... | [
{
"created": "Tue, 9 Jan 1996 17:03:33 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Brandt",
"Steven R.",
"",
"National Center for Supercomputing\n Applications, Department of Physics, Univ. of Illinois at Urbana-Champaign"
],
[
"Seidel",
"Edward",
"",
"National Center for Supercomputing\n Applications, Department of Physics, Univ. of Illinois at Urbana-Cha... | In this paper we study a new family of black hole initial data sets corresponding to distorted ``Kerr'' black holes with moderate rotation parameters, and distorted Schwarzschild black holes with even- and odd-parity radiation. These data sets build on the earlier rotating black holes of Bowen and York and the distorte... |
1505.08084 | Neil J. Cornish | Neil J. Cornish and Joseph D. Romano | When is a gravitational-wave signal stochastic? | 14 pages, 10 figures | Phys. Rev. D 92, 042001 (2015) | 10.1103/PhysRevD.92.042001 | null | gr-qc astro-ph.HE astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the detection of gravitational-wave backgrounds in the context of
Bayesian inference and suggest a practical definition of what it means for a
signal to be considered stochastic---namely, that the Bayesian evidence favors
a stochastic signal model over a deterministic signal model. A signal can
further be ... | [
{
"created": "Fri, 29 May 2015 15:14:22 GMT",
"version": "v1"
}
] | 2015-08-12 | [
[
"Cornish",
"Neil J.",
""
],
[
"Romano",
"Joseph D.",
""
]
] | We discuss the detection of gravitational-wave backgrounds in the context of Bayesian inference and suggest a practical definition of what it means for a signal to be considered stochastic---namely, that the Bayesian evidence favors a stochastic signal model over a deterministic signal model. A signal can further be cl... |
1403.5434 | Maciej Maliborski | Maciej Maliborski and Andrzej Rostworowski | What drives AdS unstable? | 7 pages, 4 figures; v2: minor corrections in the text | Phys. Rev. D 89, 124006 (2014) | 10.1103/PhysRevD.89.124006 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the spectrum of linear perturbations of standing wave solutions
discussed in [Phys. Rev. D 87, 123006 (2013)], as the first step to investigate
the stability of globally regular, asymptotically AdS, time-periodic solutions
discovered in [Phys. Rev. Lett. 111 051102 (2013)]. We show that while this
spectr... | [
{
"created": "Fri, 21 Mar 2014 12:10:25 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Apr 2014 10:05:08 GMT",
"version": "v2"
}
] | 2014-06-11 | [
[
"Maliborski",
"Maciej",
""
],
[
"Rostworowski",
"Andrzej",
""
]
] | We calculate the spectrum of linear perturbations of standing wave solutions discussed in [Phys. Rev. D 87, 123006 (2013)], as the first step to investigate the stability of globally regular, asymptotically AdS, time-periodic solutions discovered in [Phys. Rev. Lett. 111 051102 (2013)]. We show that while this spectrum... |
gr-qc/0411136 | S. Mignemi | M. Melis and S. Mignemi | Two-dimensional static black holes with pointlike sources | 11 pages, 2 figures, LaTeX. v.2: an error in the sign of the
energy-momentum tensor has been corrected; the solutions are slightly
modified | Gen.Rel.Grav. 37 (2005) 1313-1322 | 10.1007/s10714-005-0114-z | null | gr-qc | null | We study the static black hole solutions of generalized two-dimensional
dilaton-gravity theories generated by pointlike mass sources, in the hypothesis
that the matter is conformally coupled. We also discuss the motion of test
particles. Due to conformal coupling, these follow the geodesics of a metric
obtained by re... | [
{
"created": "Mon, 29 Nov 2004 11:04:40 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Mar 2005 10:09:28 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Melis",
"M.",
""
],
[
"Mignemi",
"S.",
""
]
] | We study the static black hole solutions of generalized two-dimensional dilaton-gravity theories generated by pointlike mass sources, in the hypothesis that the matter is conformally coupled. We also discuss the motion of test particles. Due to conformal coupling, these follow the geodesics of a metric obtained by resc... |
2407.14851 | Ramon Torres | Ramon Torres | Observational and theoretical aspects of Superspinars | 30 pages, 15 figures | null | null | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | This article delves into the observational signatures and theoretical
underpinnings of rotating astrophysical objects, with a particular focus on
superspinars -exotic objects characterized by preventing the formation of event
horizons due to their high angular momentum.
While solutions within General Relativity (Ke... | [
{
"created": "Sat, 20 Jul 2024 11:36:26 GMT",
"version": "v1"
}
] | 2024-07-23 | [
[
"Torres",
"Ramon",
""
]
] | This article delves into the observational signatures and theoretical underpinnings of rotating astrophysical objects, with a particular focus on superspinars -exotic objects characterized by preventing the formation of event horizons due to their high angular momentum. While solutions within General Relativity (Kerr s... |
0905.1785 | Antoine Petiteau | Antoine Petiteau, Yu Shang, Stanislav Babak | The search for black hole binaries using a genetic algorithm | 11 pages, 4 figures, proceeding for GWDAW13 (Puerto Rico) | null | 10.1088/0264-9381/26/20/204011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we use genetic algorithm to search for the gravitational wave
signal from the inspiralling massive Black Hole binaries in the simulated LISA
data. We consider a single signal in the Gaussian instrumental noise. This is a
first step in preparation for analysis of the third round of the mock LISA data
chal... | [
{
"created": "Tue, 12 May 2009 08:21:11 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Aug 2009 08:42:37 GMT",
"version": "v2"
}
] | 2015-05-13 | [
[
"Petiteau",
"Antoine",
""
],
[
"Shang",
"Yu",
""
],
[
"Babak",
"Stanislav",
""
]
] | In this work we use genetic algorithm to search for the gravitational wave signal from the inspiralling massive Black Hole binaries in the simulated LISA data. We consider a single signal in the Gaussian instrumental noise. This is a first step in preparation for analysis of the third round of the mock LISA data challe... |
2006.00855 | Daniele Gregoris | Daniele Gregoris, Kjell Rosquist | Observational backreaction in discrete black holes lattice cosmological
models | Matches published version | The European Physical Journal Plus 136:45 (2021) | 10.1140/epjp/s13360-020-00998-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Applying the Sachs formalism, the optical properties encoded in the distance
modulus are studied along curves exhibiting local rotational symmetry for some
closed inhomogeneous cosmological models whose mass content is discretized by
Schwarzschild-like sources. These models may challenge the concordance model in
its ... | [
{
"created": "Mon, 1 Jun 2020 11:21:15 GMT",
"version": "v1"
},
{
"created": "Sat, 16 Jan 2021 18:25:21 GMT",
"version": "v2"
}
] | 2021-01-19 | [
[
"Gregoris",
"Daniele",
""
],
[
"Rosquist",
"Kjell",
""
]
] | Applying the Sachs formalism, the optical properties encoded in the distance modulus are studied along curves exhibiting local rotational symmetry for some closed inhomogeneous cosmological models whose mass content is discretized by Schwarzschild-like sources. These models may challenge the concordance model in its us... |
2109.14706 | Nima Laal | Zaven Arzoumanian, Paul T. Baker, Harsha Blumer, Bence Becsy, Adam
Brazier, Paul R. Brook, Sarah Burke-Spolaor, Maria Charisi, Shami Chatterjee,
Siyuan Chen, James M. Cordes, Neil J. Cornish, Fronefield Crawford, H.
Thankful Cromartie, Megan E. DeCesar, Dallas M. DeGan, Paul B. Demorest,
Timothy Dolch, Brendan ... | The NANOGrav 12.5-year data set: Search for Non-Einsteinian Polarization
Modes in theGravitational-Wave Background | 24 pages, 18 figures, 3 appendices. Please send any
comments/questions to Nima Laal (laaln@oregonstate.edu) | The Astrophysical Journal Letters, vol. 923, no. 2, p. L22, Dec.
2021 | 10.3847/2041-8213/ac401c | null | gr-qc astro-ph.GA astro-ph.HE | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We search NANOGrav's 12.5-year data set for evidence of a gravitational wave
background (GWB) with all the spatial correlations allowed by general metric
theories of gravity. We find no substantial evidence in favor of the existence
of such correlations in our data. We find that scalar-transverse (ST)
correlations yi... | [
{
"created": "Wed, 29 Sep 2021 20:30:19 GMT",
"version": "v1"
}
] | 2021-12-20 | [
[
"Arzoumanian",
"Zaven",
"",
"for the NANOGrav\n Collaboration"
],
[
"Baker",
"Paul T.",
"",
"for the NANOGrav\n Collaboration"
],
[
"Blumer",
"Harsha",
"",
"for the NANOGrav\n Collaboration"
],
[
"Becsy",
"Bence",
"",
"for the NANOGrav... | We search NANOGrav's 12.5-year data set for evidence of a gravitational wave background (GWB) with all the spatial correlations allowed by general metric theories of gravity. We find no substantial evidence in favor of the existence of such correlations in our data. We find that scalar-transverse (ST) correlations yiel... |
2002.06573 | Pardyumn Kumar Sahoo | I. Radinschi, P.K. Sahoo, Th. Grammenos, S. Chattopadhyay and M. M.
Cazacu | Localization of Energy and Momentum in an Asymptotically
Reissner-Nordstr\"om Non-singular Black Hole Space-time Geometry | To appear in Universe | Universe, 6(5) (2020) 69 | 10.3390/universe6050069 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The space-time geometry exterior to a new four-dimensional, spherically
symmetric and charged black hole solution that, through a coupling of general
relativity with a non-linear electrodynamics, is everywhere non-singular, for
small $r$ it behaves as a de Sitter metric, and asymptotically it behaves as
the Reissner-... | [
{
"created": "Sun, 16 Feb 2020 13:11:18 GMT",
"version": "v1"
},
{
"created": "Thu, 21 May 2020 06:13:44 GMT",
"version": "v2"
}
] | 2020-05-26 | [
[
"Radinschi",
"I.",
""
],
[
"Sahoo",
"P. K.",
""
],
[
"Grammenos",
"Th.",
""
],
[
"Chattopadhyay",
"S.",
""
],
[
"Cazacu",
"M. M.",
""
]
] | The space-time geometry exterior to a new four-dimensional, spherically symmetric and charged black hole solution that, through a coupling of general relativity with a non-linear electrodynamics, is everywhere non-singular, for small $r$ it behaves as a de Sitter metric, and asymptotically it behaves as the Reissner-No... |
0705.1743 | Zhen-Hua Zhao | Zhen-Hua Zhao, Yu-Xiao Liu, Xi-Guo Li | Gravitational Corrections to the Energy-Levels of a Hydrogen Atom | 7 pages | Commun.Theor.Phys.47:658-662,2007 | 10.1088/0253-6102/47/4/018 | null | gr-qc | null | The first order perturbations of the energy levels of a hydrogen atom in
central internal gravitational field are investigated. The internal
gravitational field is produced by the mass of the atomic nucleus. The energy
shifts are calculated for the relativistic 1S, 2S, 2P, 3S, 3P, 3D, 4S and 4P
levels with Schwarzsch... | [
{
"created": "Sat, 12 May 2007 00:47:33 GMT",
"version": "v1"
}
] | 2009-03-19 | [
[
"Zhao",
"Zhen-Hua",
""
],
[
"Liu",
"Yu-Xiao",
""
],
[
"Li",
"Xi-Guo",
""
]
] | The first order perturbations of the energy levels of a hydrogen atom in central internal gravitational field are investigated. The internal gravitational field is produced by the mass of the atomic nucleus. The energy shifts are calculated for the relativistic 1S, 2S, 2P, 3S, 3P, 3D, 4S and 4P levels with Schwarzschil... |
gr-qc/0205129 | Roberto Casadio | Roberto Casadio, Lorenzo Mazzacurati | Bulk shape of brane-world black holes | 10 pages, MPLA style, 5 figures, accepted for publication in MPLA | Mod.Phys.Lett.A18:651-660,2003 | 10.1142/S0217732303009794 | null | gr-qc astro-ph hep-ph hep-th | null | We propose a method to extend into the bulk asymptotically flat static
spherically symmetric brane-world metrics. We employ the multipole (1/r)
expansion in order to allow exact integration of the relevant equations along
the (fifth) extra coordinate and make contact with the parameterized
post-Newtonian formalism. W... | [
{
"created": "Thu, 30 May 2002 12:53:22 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Feb 2003 08:58:00 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Casadio",
"Roberto",
""
],
[
"Mazzacurati",
"Lorenzo",
""
]
] | We propose a method to extend into the bulk asymptotically flat static spherically symmetric brane-world metrics. We employ the multipole (1/r) expansion in order to allow exact integration of the relevant equations along the (fifth) extra coordinate and make contact with the parameterized post-Newtonian formalism. We ... |
gr-qc/9710080 | Bernard F. Schutz | B. F. Schutz | Introduction to the Analysis of Low-Frequency Gravitational Wave Data | 20 pages | null | null | AEI-044(B) | gr-qc | null | The space-based gravitational wave detector LISA will observe in the
low-frequency gravitational-wave band (0.1 mHz up to 1 Hz). LISA will search
for a variety of expected signals, and when it detects a signal it will have to
determine a number of parameters, such as the location of the source on the sky
and the sign... | [
{
"created": "Wed, 15 Oct 1997 09:34:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Schutz",
"B. F.",
""
]
] | The space-based gravitational wave detector LISA will observe in the low-frequency gravitational-wave band (0.1 mHz up to 1 Hz). LISA will search for a variety of expected signals, and when it detects a signal it will have to determine a number of parameters, such as the location of the source on the sky and the signal... |
1801.03031 | Medine Ildes | Metin Arik, Medine Ildes, Mikhail B. Sheftel | Inflation and Linear Expansion in the Radiation Dominated era in
Jordan-Brans-Dicke Cosmology | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present several features of a cosmological model based on the
Brans-Dicke-Jordan-Thirry action which is scale invariant with a quartic
potential for the Jordan scalar field. We show that the radiation dominated era
starts with a closed universe which expands exponentially and the late
radiation dominated era expan... | [
{
"created": "Tue, 9 Jan 2018 16:53:45 GMT",
"version": "v1"
}
] | 2018-01-10 | [
[
"Arik",
"Metin",
""
],
[
"Ildes",
"Medine",
""
],
[
"Sheftel",
"Mikhail B.",
""
]
] | We present several features of a cosmological model based on the Brans-Dicke-Jordan-Thirry action which is scale invariant with a quartic potential for the Jordan scalar field. We show that the radiation dominated era starts with a closed universe which expands exponentially and the late radiation dominated era expands... |
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