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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1012.3159 | Leonardo Fernandez-Jambrina | L. Fern\'andez-Jambrina | $w$-singularities in cosmological models | 4 pp, jpconf.cls, to appear in Proceedings of Spanish Relativity
Meeting 2010 (ERE 2010) held in Granada, Spain | Journal of Physics: Conference Series 314, 012061 (2011) | 10.1088/1742-6596/314/1/012061 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently a new type of cosmological singularity has been postulated for
infinite barotropic index $w$ in the equation of state $p=w \rho$ of the
cosmological fluid, but vanishing pressure and density at the singular event.
Apparently the barotropic index $w$ would be the only physical quantity to blow
up at the singu... | [
{
"created": "Tue, 14 Dec 2010 20:50:15 GMT",
"version": "v1"
}
] | 2011-09-28 | [
[
"Fernández-Jambrina",
"L.",
""
]
] | Recently a new type of cosmological singularity has been postulated for infinite barotropic index $w$ in the equation of state $p=w \rho$ of the cosmological fluid, but vanishing pressure and density at the singular event. Apparently the barotropic index $w$ would be the only physical quantity to blow up at the singula... |
0705.3193 | Noah Graham | Noah Graham and Ken D. Olum | Achronal averaged null energy condition | 8 pages, RevTeX; v2: qualify conditions on theorem 1, fix typos | Phys.Rev.D76:064001,2007 | 10.1103/PhysRevD.76.064001 | null | gr-qc hep-th | null | The averaged null energy condition (ANEC) requires that the integral over a
complete null geodesic of the stress-energy tensor projected onto the geodesic
tangent vector is never negative. This condition is sufficient to prove many
important theorems in general relativity, but it is violated by quantum fields
in curv... | [
{
"created": "Tue, 22 May 2007 15:24:36 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Aug 2007 18:54:45 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Graham",
"Noah",
""
],
[
"Olum",
"Ken D.",
""
]
] | The averaged null energy condition (ANEC) requires that the integral over a complete null geodesic of the stress-energy tensor projected onto the geodesic tangent vector is never negative. This condition is sufficient to prove many important theorems in general relativity, but it is violated by quantum fields in curved... |
1701.02282 | Aurelien Barrau | Boris Bolliet, Aur\'elien Barrau, Killian Martineau, Flora Moulin | Some Clarifications on the Duration of Inflation in Loop Quantum
Cosmology | null | null | 10.1088/1361-6382/aa7779 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The prediction of a phase of inflation whose number of e-folds is constrained
is an important feature of loop quantum cosmology. This work aims at giving
some elementary clarifications on the role of the different hypotheses leading
to this conclusion. We show that the duration of inflation does not depend
significan... | [
{
"created": "Mon, 9 Jan 2017 17:55:23 GMT",
"version": "v1"
}
] | 2017-07-05 | [
[
"Bolliet",
"Boris",
""
],
[
"Barrau",
"Aurélien",
""
],
[
"Martineau",
"Killian",
""
],
[
"Moulin",
"Flora",
""
]
] | The prediction of a phase of inflation whose number of e-folds is constrained is an important feature of loop quantum cosmology. This work aims at giving some elementary clarifications on the role of the different hypotheses leading to this conclusion. We show that the duration of inflation does not depend significantl... |
2203.08203 | Lucas Gardai Collodel | Lucas G. Collodel and Daniela D. Doneva | Solitonic Boson Stars: Numerical solutions beyond the thin-wall
approximation | null | null | 10.1103/PhysRevD.106.084057 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we present several set of solutions of static and spherically
symmetric solitonic boson stars. Each set is characterized by the value of
{\sigma} that defines the solitonic potential in the complex scalar field
theory. The main features peculiar to this potential occur for small values of
{\sigma}, but ... | [
{
"created": "Tue, 15 Mar 2022 19:00:10 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Nov 2022 13:59:21 GMT",
"version": "v2"
}
] | 2022-11-10 | [
[
"Collodel",
"Lucas G.",
""
],
[
"Doneva",
"Daniela D.",
""
]
] | In this paper we present several set of solutions of static and spherically symmetric solitonic boson stars. Each set is characterized by the value of {\sigma} that defines the solitonic potential in the complex scalar field theory. The main features peculiar to this potential occur for small values of {\sigma}, but fo... |
gr-qc/0012028 | Amir H. Abbassi | H.Razmi & Amir H.Abbassi | The Fundamental Commutator For Massless Particles | 12 pages,no figures,To appear in Mod.Phys.Ltt.A | Mod.Phys.Lett. A15 (2000) 2027-2036 | 10.1142/S0217732300002589 | null | gr-qc | null | It is discussed that the usual Heisenberg commutation relation (CR) is not a
proper relation for massless particles and then an alternative is obtained. The
canonical quantization of the free electromagnetic(EM)fields based on the field
theoretical generalization of this alternative is carried out. Without imposing
t... | [
{
"created": "Thu, 7 Dec 2000 01:11:55 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Razmi",
"H.",
""
],
[
"Abbassi",
"Amir H.",
""
]
] | It is discussed that the usual Heisenberg commutation relation (CR) is not a proper relation for massless particles and then an alternative is obtained. The canonical quantization of the free electromagnetic(EM)fields based on the field theoretical generalization of this alternative is carried out. Without imposing the... |
gr-qc/0702050 | Stephen R. Lau | Stephen R. Lau and Richard H. Price | Multidomain Spectral Method for the Helically Reduced Wave Equation | 57 pages, 11 figures, uses elsart.cls. Final version includes
revisions based on referee reports and has two extra figures | J.Comput.Phys.227:1126-1161,2007 | 10.1016/j.jcp.2007.08.032 | null | gr-qc | null | We consider the 2+1 and 3+1 scalar wave equations reduced via a helical
Killing field, respectively referred to as the 2-dimensional and 3-dimensional
helically reduced wave equation (HRWE). The HRWE serves as the fundamental
model for the mixed-type PDE arising in the periodic standing wave (PSW)
approximation to bi... | [
{
"created": "Thu, 8 Feb 2007 17:29:59 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Nov 2007 15:05:00 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Lau",
"Stephen R.",
""
],
[
"Price",
"Richard H.",
""
]
] | We consider the 2+1 and 3+1 scalar wave equations reduced via a helical Killing field, respectively referred to as the 2-dimensional and 3-dimensional helically reduced wave equation (HRWE). The HRWE serves as the fundamental model for the mixed-type PDE arising in the periodic standing wave (PSW) approximation to bina... |
2402.06867 | Gustavo Gutierrez-Cano | Gustavo Gutierrez-Cano and Gustavo Niz | Euler-Heisenberg Black Holes in Einsteinian Cubic Gravity | 18 pages, 9 figures; V2, References added | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We explore black hole solutions and some of its physical properties in
Einstein's theory in 4D, modified by a cubic gravity term and in the presence
of non-linear electrodynamics. In the context of Effective Field Theories (EFT)
and under certain assumptions, these curvature and non-linear electromagnetic
terms repre... | [
{
"created": "Sat, 10 Feb 2024 03:10:41 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Feb 2024 02:38:43 GMT",
"version": "v2"
}
] | 2024-02-22 | [
[
"Gutierrez-Cano",
"Gustavo",
""
],
[
"Niz",
"Gustavo",
""
]
] | We explore black hole solutions and some of its physical properties in Einstein's theory in 4D, modified by a cubic gravity term and in the presence of non-linear electrodynamics. In the context of Effective Field Theories (EFT) and under certain assumptions, these curvature and non-linear electromagnetic terms represe... |
gr-qc/9403001 | Alan Rendall | Alan D. Rendall | Adjointness Relations as a Criterion for Choosing an Inner Product | 6 pages, MPA-AR-94-1 | null | 10.1007/3-540-58339-4_23 | null | gr-qc | null | This is a contribution to the forthcoming book "Canonical Gravity: {}From
Classical to Quantum" edited by J. Ehlers and H. Friedrich. Ashtekar's
criterion for choosing an inner product in the quantisation of constrained
systems is discussed. An erroneous claim in a previous paper is corrected and a
cautionary example... | [
{
"created": "Tue, 1 Mar 1994 12:23:50 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Rendall",
"Alan D.",
""
]
] | This is a contribution to the forthcoming book "Canonical Gravity: {}From Classical to Quantum" edited by J. Ehlers and H. Friedrich. Ashtekar's criterion for choosing an inner product in the quantisation of constrained systems is discussed. An erroneous claim in a previous paper is corrected and a cautionary example i... |
2308.08415 | Beyhan Pulice | Beyhan Puli\c{c}e, Reggie C. Pantig, Ali \"Ovg\"un, Durmu\c{s} Demir | Constraints on charged Symmergent black hole from shadow and lensing | 20 pages, 8 figures. Accepted for publication in Classical and
Quantum Gravity, "Special Issue: Focus on Quantum Gravity Phenomenology in
the Multi-Messenger Era: Challenges and Perspectives" | Class. Quantum Grav. 40 195003 (2023) | 10.1088/1361-6382/acf08c | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we report on exact charged black hole solutions in symmergent
gravity with Maxwell field. Symmergent gravity induces the gravitational
constant $G$, quadratic curvature coefficient $c_{\rm O}$, and the vacuum
energy $V_{\rm O}$ from the flat spacetime matter loops. In the limit in which
all fields are ... | [
{
"created": "Wed, 16 Aug 2023 15:01:04 GMT",
"version": "v1"
}
] | 2023-09-12 | [
[
"Puliçe",
"Beyhan",
""
],
[
"Pantig",
"Reggie C.",
""
],
[
"Övgün",
"Ali",
""
],
[
"Demir",
"Durmuş",
""
]
] | In this paper, we report on exact charged black hole solutions in symmergent gravity with Maxwell field. Symmergent gravity induces the gravitational constant $G$, quadratic curvature coefficient $c_{\rm O}$, and the vacuum energy $V_{\rm O}$ from the flat spacetime matter loops. In the limit in which all fields are de... |
2405.11805 | Samuel Shuman | Samuel Shuman | The Geometry of Tangent Spaces on Causal Sets | 9 pages, 6 figures | null | null | null | gr-qc math.DG | http://creativecommons.org/licenses/by/4.0/ | In this paper, we expand on previous work describing partial derivatives and
metric component estimators to define tangent spaces on causal sets. Partial
derivative operators are the basis vectors of the tangent space, and the metric
defines the inner product. First, we use partial derivatives of the metric
component... | [
{
"created": "Mon, 20 May 2024 05:55:38 GMT",
"version": "v1"
}
] | 2024-05-21 | [
[
"Shuman",
"Samuel",
""
]
] | In this paper, we expand on previous work describing partial derivatives and metric component estimators to define tangent spaces on causal sets. Partial derivative operators are the basis vectors of the tangent space, and the metric defines the inner product. First, we use partial derivatives of the metric components ... |
gr-qc/0501023 | Richard Price | Richard H. Price | Projectiles, pendula, and special relativity | 9 pages, 5 figures; to appear in American Journal of Physics | Am.J.Phys. 73 (2005) 433-438 | 10.1119/1.1862632 | null | gr-qc | null | The kind of flat-earth gravity used in introductory physics appears in an
accelerated reference system in special relativity. From this viewpoint, we
work out the special relativistic description of a ballistic projectile and a
simple pendulum, two examples of simple motion driven by earth-surface gravity.
The analys... | [
{
"created": "Sat, 8 Jan 2005 15:40:24 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Price",
"Richard H.",
""
]
] | The kind of flat-earth gravity used in introductory physics appears in an accelerated reference system in special relativity. From this viewpoint, we work out the special relativistic description of a ballistic projectile and a simple pendulum, two examples of simple motion driven by earth-surface gravity. The analysis... |
2011.08084 | Junji Jia | Junji Jia, Ke Huang | Perturbative deflection angle, gravitational lensing in the strong field
limit and the black hole shadow | 13 pages, 5 figures; | null | 10.1140/epjc/s10052-021-09026-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A perturbative method to compute the deflection angle of both timelike and
null rays in arbitrary static and spherically symmetric spacetimes in the
strong field limit is proposed. The result takes a quasi-series form of
$(1-b_c/b)$ where $b$ is the impact parameter and $b_c$ is its critical value,
with coefficients ... | [
{
"created": "Mon, 16 Nov 2020 16:32:28 GMT",
"version": "v1"
}
] | 2021-04-07 | [
[
"Jia",
"Junji",
""
],
[
"Huang",
"Ke",
""
]
] | A perturbative method to compute the deflection angle of both timelike and null rays in arbitrary static and spherically symmetric spacetimes in the strong field limit is proposed. The result takes a quasi-series form of $(1-b_c/b)$ where $b$ is the impact parameter and $b_c$ is its critical value, with coefficients of... |
1912.13320 | Kimet Jusufi | Kimet Jusufi | Quasinormal Modes of Black Holes Surrounded by Dark Matter and Their
Connection with the Shadow Radius | 11 pages, 8 figures. Accepted for publication in PRD | Phys. Rev. D 101, 084055 (2020) | 10.1103/PhysRevD.101.084055 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The purpose of this article is twofold. First, we highlight a simple
connection between the real part of quasinormal modes (QNMs) in the eikonal
limit and shadow radius of BHs and then explore the effect of dark matter on
the QNMs of massless scalar field and electromagnetic field perturbations in a
black hole (BH) s... | [
{
"created": "Wed, 25 Dec 2019 13:15:35 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Mar 2020 12:12:21 GMT",
"version": "v2"
}
] | 2020-04-29 | [
[
"Jusufi",
"Kimet",
""
]
] | The purpose of this article is twofold. First, we highlight a simple connection between the real part of quasinormal modes (QNMs) in the eikonal limit and shadow radius of BHs and then explore the effect of dark matter on the QNMs of massless scalar field and electromagnetic field perturbations in a black hole (BH) spa... |
gr-qc/0004039 | John W. Norbury | Adam T. Kruger and John W. Norbury | Another exact inflationary solution | 10 pages, 0 figures | Phys.Rev. D61 (2000) 087303 | 10.1103/PhysRevD.61.087303 | null | gr-qc | null | A new closed-form inflationary solution is given for a hyperbolic interaction
potential. The method used to arrive at this solution is outlined as it appears
possible to generate additional sets of equations which satisfy the model. In
addition a new form of decaying cosmological constant is presented.
| [
{
"created": "Wed, 12 Apr 2000 21:46:36 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kruger",
"Adam T.",
""
],
[
"Norbury",
"John W.",
""
]
] | A new closed-form inflationary solution is given for a hyperbolic interaction potential. The method used to arrive at this solution is outlined as it appears possible to generate additional sets of equations which satisfy the model. In addition a new form of decaying cosmological constant is presented. |
1311.7144 | Kent Yagi | Kent Yagi, Diego Blas, Enrico Barausse, Nicolas Yunes | Constraints on Einstein-\AE ther theory and Horava gravity from binary
pulsar observations | 42 pages, 8 figures; typos corrected | Phys. Rev. D 89, 084067 (2014) | 10.1103/PhysRevD.89.084067 | CERN-PH-TH/2013-262 | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Binary pulsars are ideal to test the foundations of General Relativity, such
as Lorentz symmetry, which requires that experiments produce the same results
in all free-falling (i.e.inertial) frames. We here break this symmetry in the
gravitational sector by specifying a preferred time direction, and thus a
preferred f... | [
{
"created": "Wed, 27 Nov 2013 21:00:02 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Mar 2014 16:03:22 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Sep 2014 16:30:42 GMT",
"version": "v3"
},
{
"created": "Fri, 18 Aug 2017 17:43:25 GMT",
"version": "v4"
}
] | 2017-08-21 | [
[
"Yagi",
"Kent",
""
],
[
"Blas",
"Diego",
""
],
[
"Barausse",
"Enrico",
""
],
[
"Yunes",
"Nicolas",
""
]
] | Binary pulsars are ideal to test the foundations of General Relativity, such as Lorentz symmetry, which requires that experiments produce the same results in all free-falling (i.e.inertial) frames. We here break this symmetry in the gravitational sector by specifying a preferred time direction, and thus a preferred fra... |
2204.01391 | Pawan Joshi | Pawan Joshi, Sukanta Panda | Hamiltonian Analysis of Nonlocal F(R) Gravity Models | 17 pages | null | 10.1140/epjc/s10052-022-10557-w | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a Hamiltonian for the nonlocal F(R) theory in the present work.
By this construction, we demonstrate the nature of the ghost degrees of
freedom. Finally, we find conditions that give rise to ghost-free theories
| [
{
"created": "Mon, 4 Apr 2022 11:18:10 GMT",
"version": "v1"
}
] | 2022-07-27 | [
[
"Joshi",
"Pawan",
""
],
[
"Panda",
"Sukanta",
""
]
] | We construct a Hamiltonian for the nonlocal F(R) theory in the present work. By this construction, we demonstrate the nature of the ghost degrees of freedom. Finally, we find conditions that give rise to ghost-free theories |
gr-qc/0512115 | Gennadi Sardanashvily | G.Sardanashvily | Gauge gravitation theory from the geometric viewpoint | 20 pages, Preface to the special issue of Int.J.Geom.Methods
Mod.Phys, dedicated to the 50th aniversary of gauge gravitation theory | Int.J.Geom.Methods Mod.Phys., v.3, N1 (2006) pp.v-xx | null | null | gr-qc hep-th math-ph math.MP | null | This is the Preface to the special issue of 'International Journal of
Geometric Methods in Modern Physics', v.3, N.1 (2006) dedicated to the 50th
aniversary of gauge gravitation theory. It addresses the geometry underlying
gauge gravitation theories, their higher-dimensional, supergauge and
non-commutatuve extensions... | [
{
"created": "Tue, 20 Dec 2005 12:57:24 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Feb 2006 18:43:21 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Sardanashvily",
"G.",
""
]
] | This is the Preface to the special issue of 'International Journal of Geometric Methods in Modern Physics', v.3, N.1 (2006) dedicated to the 50th aniversary of gauge gravitation theory. It addresses the geometry underlying gauge gravitation theories, their higher-dimensional, supergauge and non-commutatuve extensions. |
0910.4333 | Hubert F M Goenner | Hubert F. Goenner | What kind of science is cosmology? | 62 pages, to appear in Annalen der Physik 2010 | Annalen Phys.522:389-418,2010 | 10.1002/andp.201010450 | null | gr-qc astro-ph.CO physics.hist-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In recent years, by theory and observation cosmology has advanced
substantially. Parameters of the concordance or $\Lambda$CDM cosmological model
are given with unprecedented precision ("precision cosmology"). On the other
side, 95% of the matter content of the universe are of an unknown nature. This
awkward situatio... | [
{
"created": "Thu, 22 Oct 2009 14:15:04 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Mar 2010 11:15:00 GMT",
"version": "v2"
}
] | 2012-04-17 | [
[
"Goenner",
"Hubert F.",
""
]
] | In recent years, by theory and observation cosmology has advanced substantially. Parameters of the concordance or $\Lambda$CDM cosmological model are given with unprecedented precision ("precision cosmology"). On the other side, 95% of the matter content of the universe are of an unknown nature. This awkward situation ... |
0907.2440 | John W. Barrett | John W. Barrett, Richard J. Dowdall, Winston J. Fairbairn, Frank
Hellmann, Roberto Pereira | Lorentzian spin foam amplitudes: graphical calculus and asymptotics | 30 pages. v2: references now appear. v3: presentation greatly
improved (particularly diagrammatic calculus). Definition of "Regge state"
now the same as in previous work; signs change in final formula as a result.
v4: two references added | Class.Quant.Grav.27:165009,2010 | 10.1088/0264-9381/27/16/165009 | null | gr-qc hep-th math.RT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The amplitude for the 4-simplex in a spin foam model for quantum gravity is
defined using a graphical calculus for the unitary representations of the
Lorentz group. The asymptotics of this amplitude are studied in the limit when
the representation parameters are large, for various cases of boundary data. It
is shown ... | [
{
"created": "Tue, 14 Jul 2009 19:54:14 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Jul 2009 05:33:48 GMT",
"version": "v2"
},
{
"created": "Tue, 30 Mar 2010 14:54:28 GMT",
"version": "v3"
},
{
"created": "Thu, 27 May 2010 18:11:41 GMT",
"version": "v4"
}
] | 2014-11-20 | [
[
"Barrett",
"John W.",
""
],
[
"Dowdall",
"Richard J.",
""
],
[
"Fairbairn",
"Winston J.",
""
],
[
"Hellmann",
"Frank",
""
],
[
"Pereira",
"Roberto",
""
]
] | The amplitude for the 4-simplex in a spin foam model for quantum gravity is defined using a graphical calculus for the unitary representations of the Lorentz group. The asymptotics of this amplitude are studied in the limit when the representation parameters are large, for various cases of boundary data. It is shown th... |
1206.2828 | Alexander Kamenshchik | A.A. Andrianov, F. Cannata, A.Y. Kamenshchik | Remarks on the general solution for the flat Friedman universe with
exponential scalar-field potential and dust | 11 pages | null | 10.1103/PhysRevD.86.107303 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the simple extension of the method of obtaining the general
exact solution for the cosmological model with the exponential scalar-field
potential to the case when the dust is present fails and we discuss the reasons
of this puzzling phenomenon.
| [
{
"created": "Wed, 13 Jun 2012 14:42:26 GMT",
"version": "v1"
}
] | 2015-06-05 | [
[
"Andrianov",
"A. A.",
""
],
[
"Cannata",
"F.",
""
],
[
"Kamenshchik",
"A. Y.",
""
]
] | We show that the simple extension of the method of obtaining the general exact solution for the cosmological model with the exponential scalar-field potential to the case when the dust is present fails and we discuss the reasons of this puzzling phenomenon. |
1003.0604 | Maurice H. P. M. van Putten | Maurice H.P.M. van Putten | Extended black hole cosmologies in de Sitter space | to appear in Class. Quant. Grav | null | 10.1088/0264-9381/27/7/075011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We generalize the superposition principle for time-symmetric initial data of
black hole spacetimes to (anti-)de Sitter cosmologies in terms of an eigenvalue
problem $\Delta_g\phi={1/8}(R_g-2\Lambda)\phi$ for a conformal scale $\phi$
applied to a metric $g_{ij}$ with constant three-curvature $R_g$. Here,
$R_g=0,2$ in ... | [
{
"created": "Tue, 2 Mar 2010 12:46:45 GMT",
"version": "v1"
}
] | 2015-05-18 | [
[
"van Putten",
"Maurice H. P. M.",
""
]
] | We generalize the superposition principle for time-symmetric initial data of black hole spacetimes to (anti-)de Sitter cosmologies in terms of an eigenvalue problem $\Delta_g\phi={1/8}(R_g-2\Lambda)\phi$ for a conformal scale $\phi$ applied to a metric $g_{ij}$ with constant three-curvature $R_g$. Here, $R_g=0,2$ in th... |
gr-qc/9811082 | F. Darabi | M. A. Jafarizadeh, F. Darabi, A. Rezaei-Aghdam, A. R. Rastegar | Tunneling in $\Lambda$ Decaying Cosmologies and the Cosmological
Constant Problem | 21 pages, REVTEX, The section 3 is considerably completed including
some physical mechanisms supporting the time variation of the cosmological
constant, added references for the section 3. Accepted to be published in
Phys. Rev. D | Phys.Rev. D60 (1999) 063514 | 10.1103/PhysRevD.60.063514 | null | gr-qc hep-th | null | The tunneling rate, with exact prefactor, is calculated to first order in
$\hbar$ for an empty closed Friedmann-Robertson-Walker (FRW) universe with
decaying cosmological term $\Lambda \sim R^{-m}$ ($R$ is the scale factor and
$m$ is a parameter $0\leq m \leq 2$). This model is equivalent to a cosmology
with the equa... | [
{
"created": "Tue, 24 Nov 1998 08:16:29 GMT",
"version": "v1"
},
{
"created": "Sat, 15 May 1999 11:30:20 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Jafarizadeh",
"M. A.",
""
],
[
"Darabi",
"F.",
""
],
[
"Rezaei-Aghdam",
"A.",
""
],
[
"Rastegar",
"A. R.",
""
]
] | The tunneling rate, with exact prefactor, is calculated to first order in $\hbar$ for an empty closed Friedmann-Robertson-Walker (FRW) universe with decaying cosmological term $\Lambda \sim R^{-m}$ ($R$ is the scale factor and $m$ is a parameter $0\leq m \leq 2$). This model is equivalent to a cosmology with the equati... |
2209.14527 | Kiyoshi Shiraishi | Nahomi Kan, Takuma Aoyama, Kiyoshi Shiraishi | Spinorial Wheeler-DeWitt wave functions inside black hole horizons | 16 pages, 3 figures. Final version | Class. Quant. Grav. 40 (2023) 16, 165006 | 10.1088/1361-6382/ace496 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We revisit the solutions of the Wheeler-DeWitt (WDW) equation inside the
horizons of spherical black holes and planar topological black holes in
arbitrary dimensions. For these systems, the solutions of the equations are
found to have the same form. Therefore, Yeom's Annihilation-to-nothing
interpretation can be appl... | [
{
"created": "Thu, 29 Sep 2022 03:18:01 GMT",
"version": "v1"
},
{
"created": "Sat, 26 Nov 2022 05:00:36 GMT",
"version": "v2"
},
{
"created": "Fri, 17 Mar 2023 06:49:56 GMT",
"version": "v3"
},
{
"created": "Tue, 16 May 2023 08:18:35 GMT",
"version": "v4"
},
{
"c... | 2023-07-27 | [
[
"Kan",
"Nahomi",
""
],
[
"Aoyama",
"Takuma",
""
],
[
"Shiraishi",
"Kiyoshi",
""
]
] | We revisit the solutions of the Wheeler-DeWitt (WDW) equation inside the horizons of spherical black holes and planar topological black holes in arbitrary dimensions. For these systems, the solutions of the equations are found to have the same form. Therefore, Yeom's Annihilation-to-nothing interpretation can be applie... |
2001.05175 | Qing-Hua Zhu | Zhe Chang and Qing-Hua Zhu | A revisit of rotating black hole shadow with astrometric observables | 26 pages, 15 figures; v2: references added, published in PRD | Phys. Rev. D 101, 084029 (2020) | 10.1103/PhysRevD.101.084029 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The first image of black hole in M87 galaxy taken by Event Horizon Telescope
shows that directed observation of supermassive black holes would be a
promising way to test general relativity in strong gravity field regime. In
order to calculate shadow of rotating black holes with respect to observers
located at finite ... | [
{
"created": "Wed, 15 Jan 2020 08:26:06 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Apr 2020 06:57:33 GMT",
"version": "v2"
}
] | 2020-04-17 | [
[
"Chang",
"Zhe",
""
],
[
"Zhu",
"Qing-Hua",
""
]
] | The first image of black hole in M87 galaxy taken by Event Horizon Telescope shows that directed observation of supermassive black holes would be a promising way to test general relativity in strong gravity field regime. In order to calculate shadow of rotating black holes with respect to observers located at finite di... |
2109.10753 | Flavio Mercati | Flavio Mercati and David Sloan | Through a Black Hole Singularity | 8 pages, 5 figures | null | 10.1103/PhysRevD.106.044015 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the Kantowski--Sachs model of a Schwarzschild black hole
interior can be slightly generalized in order to accommodate spatial metrics of
different orientations, and in this formulation the equations of motion admit a
variable redefinition that makes the system regular at the singularity. This
system will... | [
{
"created": "Wed, 22 Sep 2021 14:19:05 GMT",
"version": "v1"
}
] | 2022-08-17 | [
[
"Mercati",
"Flavio",
""
],
[
"Sloan",
"David",
""
]
] | We show that the Kantowski--Sachs model of a Schwarzschild black hole interior can be slightly generalized in order to accommodate spatial metrics of different orientations, and in this formulation the equations of motion admit a variable redefinition that makes the system regular at the singularity. This system will t... |
1912.09307 | Lorenzo Sebastiani | Alessandro Casalino, Lorenzo Sebastiani, Luciano Vanzo, Sergio Zerbini | Higher derivative and mimetic models on non flat FLRW space-times | 17 pages, final version accepted in Physics of the Dark Universe | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An effective Lagrangian approach, partly inspired by Quantum Loop Cosmology
(QLC), is presented and formulated in a non flat FLRW space-times, making use
of modified gravitational models. The models considered are non generic, and
their choice is dictated by the necessity to have at least second order
differential eq... | [
{
"created": "Wed, 18 Dec 2019 17:10:52 GMT",
"version": "v1"
},
{
"created": "Thu, 14 May 2020 08:44:10 GMT",
"version": "v2"
}
] | 2020-05-15 | [
[
"Casalino",
"Alessandro",
""
],
[
"Sebastiani",
"Lorenzo",
""
],
[
"Vanzo",
"Luciano",
""
],
[
"Zerbini",
"Sergio",
""
]
] | An effective Lagrangian approach, partly inspired by Quantum Loop Cosmology (QLC), is presented and formulated in a non flat FLRW space-times, making use of modified gravitational models. The models considered are non generic, and their choice is dictated by the necessity to have at least second order differential equa... |
2112.15052 | Xiao-Mei Kuang | Zhen-Hao Yang, Guoyang Fu, Xiao-Mei Kuang, Jian-Pin Wu | Instability of de-Sitter black hole with massive scalar field coupled to
Gauss-Bonnet invariant and the scalarized black holes | version accepted for publication in EPJC | Eur. Phys. J. C (2022) 82:868 | 10.1140/epjc/s10052-022-10834-8 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The black hole scalarization in a special Einstein-scalar-Gauss-Bonnet (EsGB)
gravity has been widely investigated in recent years. Especially, the
spontaneous scalarization of scalar-free black hole in de-Sitter (dS) spacetime
possesses interesting features due to the existence of cosmological horizon. In
this work,... | [
{
"created": "Thu, 30 Dec 2021 13:30:34 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Sep 2022 13:16:22 GMT",
"version": "v2"
}
] | 2022-10-07 | [
[
"Yang",
"Zhen-Hao",
""
],
[
"Fu",
"Guoyang",
""
],
[
"Kuang",
"Xiao-Mei",
""
],
[
"Wu",
"Jian-Pin",
""
]
] | The black hole scalarization in a special Einstein-scalar-Gauss-Bonnet (EsGB) gravity has been widely investigated in recent years. Especially, the spontaneous scalarization of scalar-free black hole in de-Sitter (dS) spacetime possesses interesting features due to the existence of cosmological horizon. In this work, f... |
1710.00747 | Chandrima Ganguly | Chandrima Ganguly and John D. Barrow | Evolution of Cyclic Mixmaster Universes with Non-comoving Radiation | 18 pages, 26 figures | Phys. Rev. D 96, 123534 (2017) | 10.1103/PhysRevD.96.123534 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a model of a cyclic, spatially homogeneous, anisotropic 'mixmaster'
universe of Bianchi type IX, containing a radiation field with non-comoving
('tilted' with respect to the tetrad frame of reference) velocities and
vorticity. We employ a combination of numerical and approximate analytic
methods to investiga... | [
{
"created": "Mon, 2 Oct 2017 16:01:47 GMT",
"version": "v1"
}
] | 2018-01-03 | [
[
"Ganguly",
"Chandrima",
""
],
[
"Barrow",
"John D.",
""
]
] | We study a model of a cyclic, spatially homogeneous, anisotropic 'mixmaster' universe of Bianchi type IX, containing a radiation field with non-comoving ('tilted' with respect to the tetrad frame of reference) velocities and vorticity. We employ a combination of numerical and approximate analytic methods to investigate... |
2310.19645 | Yi-Fan Wang | Yi-Fan Wang, Collin D. Capano, Jahed Abedi, Shilpa Kastha, Badri
Krishnan, Alex B. Nielsen, Alexander H. Nitz and Julian Westerweck | A frequency-domain perspective on GW150914 ringdown overtone | 8 pages, 7 figures. Data release at
https://github.com/gwastro/gw150914-overtone. Comments welcome! | null | null | LIGO-P2300340 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the recent debate on the evidence for an overtone in the black
hole ringdown of GW150914. By gating and inpainting the data, we discard the
contamination from earlier parts of the gravitational wave signal before
ringdown. This enables the parameter estimation to be conducted in the
frequency domain, which... | [
{
"created": "Mon, 30 Oct 2023 15:34:11 GMT",
"version": "v1"
}
] | 2023-10-31 | [
[
"Wang",
"Yi-Fan",
""
],
[
"Capano",
"Collin D.",
""
],
[
"Abedi",
"Jahed",
""
],
[
"Kastha",
"Shilpa",
""
],
[
"Krishnan",
"Badri",
""
],
[
"Nielsen",
"Alex B.",
""
],
[
"Nitz",
"Alexander H.",
""
],
[
... | We revisit the recent debate on the evidence for an overtone in the black hole ringdown of GW150914. By gating and inpainting the data, we discard the contamination from earlier parts of the gravitational wave signal before ringdown. This enables the parameter estimation to be conducted in the frequency domain, which i... |
2003.03839 | Ward Struyve | Detlef D\"urr, Ward Struyve | Quantum Einstein equations | 17 pages, LaTeX; v2 typos corrected | Class. Quantum Grav. 37, 135002 (2020) | 10.1088/1361-6382/ab92ed | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the quantum Einstein equations (which are the quantum
generalisation of the Einstein equations of classical gravity) from Bohmian
quantum gravity. Bohmian quantum gravity is a non-classical geometrodynamics
(in the ADM formalism) which describes the time evolution of a 3-geometry and
of a matter field (or o... | [
{
"created": "Sun, 8 Mar 2020 19:52:29 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Aug 2020 10:34:15 GMT",
"version": "v2"
}
] | 2020-08-11 | [
[
"Dürr",
"Detlef",
""
],
[
"Struyve",
"Ward",
""
]
] | We derive the quantum Einstein equations (which are the quantum generalisation of the Einstein equations of classical gravity) from Bohmian quantum gravity. Bohmian quantum gravity is a non-classical geometrodynamics (in the ADM formalism) which describes the time evolution of a 3-geometry and of a matter field (or oth... |
gr-qc/0605117 | Y. Jack Ng | Michele Arzano, Thomas W. Kephart, and Y. Jack Ng | From spacetime foam to holographic foam cosmology | 8 pages, TeX; dedicated to Rafael Sorkin | Phys.Lett.B649:243-246,2007 | 10.1016/j.physletb.2007.04.024 | null | gr-qc | null | Due to quantum fluctuations, spacetime is foamy on small scales. For maximum
spatial resolution of the geometry of spacetime, the holographic model of
spacetime foam stipulates that the uncertainty or fluctuation of distance $l$
is given, on the average, by $(l l_P^2)^{1/3}$ where $l_P$ is the Planck
length. Applied ... | [
{
"created": "Mon, 22 May 2006 19:09:00 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Arzano",
"Michele",
""
],
[
"Kephart",
"Thomas W.",
""
],
[
"Ng",
"Y. Jack",
""
]
] | Due to quantum fluctuations, spacetime is foamy on small scales. For maximum spatial resolution of the geometry of spacetime, the holographic model of spacetime foam stipulates that the uncertainty or fluctuation of distance $l$ is given, on the average, by $(l l_P^2)^{1/3}$ where $l_P$ is the Planck length. Applied to... |
gr-qc/0109052 | Fatimah Shojai | Fatimah Shojai and Ali Shojai | Quantum Einstein's Equations and Constraints Algebra | 13 pages, No figure, RevTeX. To appear in Pramana J. Phys., 2001 | Pramana 58:13-19,2002 | 10.1007/s12043-002-0002-y | null | gr-qc | null | In this paper we shall address this problem: Is quantum gravity constraints
algebra closed and what are the quantum Einstein equations. We shall
investigate this problem in the de-Broglie--Bohm quantum theory framework. It
is shown that the constraint algebra is weakly closed and the quantum
Einstein's equations are ... | [
{
"created": "Sun, 16 Sep 2001 08:15:39 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Shojai",
"Fatimah",
""
],
[
"Shojai",
"Ali",
""
]
] | In this paper we shall address this problem: Is quantum gravity constraints algebra closed and what are the quantum Einstein equations. We shall investigate this problem in the de-Broglie--Bohm quantum theory framework. It is shown that the constraint algebra is weakly closed and the quantum Einstein's equations are de... |
gr-qc/0701022 | Lior M. Burko | Lior M. Burko | Orbital evolution for extreme mass-ratio binaries: conservative self
forces | 3 figures, in Proceedings of the Sixth International LISA Symposium
(AIP, 2006) | AIPConf.Proc.873:269-273,2006 | 10.1063/1.2405054 | null | gr-qc | null | The conservative dephasing effects of gravitational self forces for extreme
mass-ratio inspirals are studied. Both secular and non-secular conservative
effects may have a significant effect on LISA waveforms that is independent of
the mass ratio of the system. Such effects need to be included in generated
waveforms t... | [
{
"created": "Tue, 2 Jan 2007 20:04:04 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Burko",
"Lior M.",
""
]
] | The conservative dephasing effects of gravitational self forces for extreme mass-ratio inspirals are studied. Both secular and non-secular conservative effects may have a significant effect on LISA waveforms that is independent of the mass ratio of the system. Such effects need to be included in generated waveforms to ... |
2005.10592 | Arvin Ravanpak | Arvin Ravanpak and Golnaz Farpour Fadakar | Dynamical System Analysis of Randall-Sundrum Model with Tachyon Field on
the Brane | null | Phys. Rev. D 101, 103525 (2020) | 10.1103/PhysRevD.101.103525 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this manuscript we use the dynamical system approach to study the linear
dynamics of a Randall-Sundrum braneworld model with a tachyon scalar field
confined to the brane. We recognize that the form of the tachyon potential
plays a significant role in the evolution of the universe. For the case of an
inverse square... | [
{
"created": "Thu, 21 May 2020 12:04:21 GMT",
"version": "v1"
}
] | 2020-05-27 | [
[
"Ravanpak",
"Arvin",
""
],
[
"Fadakar",
"Golnaz Farpour",
""
]
] | In this manuscript we use the dynamical system approach to study the linear dynamics of a Randall-Sundrum braneworld model with a tachyon scalar field confined to the brane. We recognize that the form of the tachyon potential plays a significant role in the evolution of the universe. For the case of an inverse square p... |
1405.4430 | Donato Bini | Donato Bini and Bahram Mashhoon | Peculiar velocities in dynamic spacetimes | 17 pages, 1 figure; v2: minor stylistic improvements | Phys. Rev. D 90, 024030 (2014) | 10.1103/PhysRevD.90.024030 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the asymptotic behavior of peculiar velocities in certain
physically significant time-dependent gravitational fields. Previous studies of
the motion of free test particles have focused on the \emph{collapse scenario},
according to which a double-jet pattern with Lorentz factor $\gamma \to \infty$
devel... | [
{
"created": "Sat, 17 May 2014 19:41:55 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Jul 2014 07:45:01 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Bini",
"Donato",
""
],
[
"Mashhoon",
"Bahram",
""
]
] | We investigate the asymptotic behavior of peculiar velocities in certain physically significant time-dependent gravitational fields. Previous studies of the motion of free test particles have focused on the \emph{collapse scenario}, according to which a double-jet pattern with Lorentz factor $\gamma \to \infty$ develop... |
1907.11214 | Carlos A. S. Almeida | J. E. G. Silva, R. V. Maluf, C. A. S. Almeida | Bipartite-Finsler symmetries | 15 pages, 2 figures. Small modifications in the text to match the
accepted version in Physics Letters B | null | 10.1016/j.physletb.2019.135009 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we study the symmetries of a Lorentz violating
bipartite-Finsler spacetime. By using the Finslerian Killing equation for the
bipartite-Finsler metric, we analyze how the anisotropy of the bipartite
spacetime modifies the local Lorentz symmetries. The symmetries of the Finsler
metric allow us to obtain t... | [
{
"created": "Thu, 25 Jul 2019 17:37:13 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Oct 2019 12:56:14 GMT",
"version": "v2"
}
] | 2020-01-08 | [
[
"Silva",
"J. E. G.",
""
],
[
"Maluf",
"R. V.",
""
],
[
"Almeida",
"C. A. S.",
""
]
] | In this work, we study the symmetries of a Lorentz violating bipartite-Finsler spacetime. By using the Finslerian Killing equation for the bipartite-Finsler metric, we analyze how the anisotropy of the bipartite spacetime modifies the local Lorentz symmetries. The symmetries of the Finsler metric allow us to obtain the... |
1112.4508 | Ovidiu Cristinel Stoica | Ovidiu-Cristinel Stoica | The Friedmann-Lemaitre-Robertson-Walker Big Bang singularities are well
behaved | 10 pages, 5 figures | Int. J. Theor. Phys. (2015): 1-10 | 10.1007/s10773-015-2634-y | null | gr-qc astro-ph.CO math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the Big Bang singularity of the
Friedmann-Lemaitre-Robertson-Walker model does not raise major problems to
General Relativity. We prove a theorem showing that the Einstein equation can
be written in a non-singular form, which allows the extension of the spacetime
before the Big Bang. The physical interpr... | [
{
"created": "Mon, 19 Dec 2011 21:48:00 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Mar 2012 08:50:06 GMT",
"version": "v2"
},
{
"created": "Tue, 2 Jun 2015 14:41:41 GMT",
"version": "v3"
}
] | 2015-06-03 | [
[
"Stoica",
"Ovidiu-Cristinel",
""
]
] | We show that the Big Bang singularity of the Friedmann-Lemaitre-Robertson-Walker model does not raise major problems to General Relativity. We prove a theorem showing that the Einstein equation can be written in a non-singular form, which allows the extension of the spacetime before the Big Bang. The physical interpret... |
1111.5991 | Dibakar Roychowdhury | Arindam Lala, Dibakar Roychowdhury | Ehrenfest's scheme and thermodynamic geometry in Born-Infeld AdS black
holes | Published version | Phys. Rev. D 86, 084027 (2012) | 10.1103/PhysRevD.86.084027 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we analyze the phase transition phenomena in Born-Infeld AdS
black holes using Ehrenfest's scheme of standard thermodynamics. The critical
points are marked by the divergences in the heat capacity. In order to
investigate the nature of the phase transition, we analytically check both the
Ehrenfest's equ... | [
{
"created": "Fri, 25 Nov 2011 14:09:36 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Sep 2012 05:46:04 GMT",
"version": "v2"
},
{
"created": "Wed, 10 Oct 2012 09:04:58 GMT",
"version": "v3"
}
] | 2015-06-03 | [
[
"Lala",
"Arindam",
""
],
[
"Roychowdhury",
"Dibakar",
""
]
] | In this paper we analyze the phase transition phenomena in Born-Infeld AdS black holes using Ehrenfest's scheme of standard thermodynamics. The critical points are marked by the divergences in the heat capacity. In order to investigate the nature of the phase transition, we analytically check both the Ehrenfest's equat... |
gr-qc/9708016 | Franz Embacher | Franz Embacher | Hand-waving Refined Algebraic Quantization | 12 pages, LaTeX (no figures), Talk given at the meeting "Modern
Modified Theories of Gravitation and Cosmology", Ben Gurion University, Beer
Sheva, June 29-30, 1997. I added some remarks on the connection of RAQ to the
Faddeev-Popov way of defining the inner product | Hadronic J.21:337-350,1998 | null | UWThPh-1997-22 | gr-qc | null | Some basic ideas of the Refined Algebraic Quantization scheme are outlined at
an intuitive level, using a class of simple models with a single wave equation
as quantum constraint. In addition, hints are given how the scheme is applied
to more sophisticated models, and it is tried to make transparent the general
patte... | [
{
"created": "Thu, 7 Aug 1997 18:36:43 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Aug 1997 16:52:14 GMT",
"version": "v2"
}
] | 2011-04-15 | [
[
"Embacher",
"Franz",
""
]
] | Some basic ideas of the Refined Algebraic Quantization scheme are outlined at an intuitive level, using a class of simple models with a single wave equation as quantum constraint. In addition, hints are given how the scheme is applied to more sophisticated models, and it is tried to make transparent the general pattern... |
1308.3453 | Richard Woodard | D. Glavan (Utrecht), S. P. Miao (Utrecht), T. Prokopec (Utrecht) and
R. P. Woodard (Florda) | Electrodynamic Effects of Inflationary Gravitons | 20 pages, 3 figures, uses RevTeX4.1. Version 2 revised for
publication with many typos corrected | Class. Quantum Grav. 31 (2014) 175002 | 10.1088/0264-9381/31/17/175002 | ITP-UU-13/19, SPIN-13/12, UFIFT-QG-13-07 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the one-loop corrections from inflationary gravitons to the
electromagnetic fields of a point charge and a point magnetic dipole on a
locally de Sitter space background. Results are obtained both for an observer
at rest in co-moving coordinates, whose physical distance from the sources
increases with the... | [
{
"created": "Thu, 15 Aug 2013 16:41:47 GMT",
"version": "v1"
},
{
"created": "Sat, 9 Aug 2014 08:21:11 GMT",
"version": "v2"
}
] | 2014-08-12 | [
[
"Glavan",
"D.",
"",
"Utrecht"
],
[
"Miao",
"S. P.",
"",
"Utrecht"
],
[
"Prokopec",
"T.",
"",
"Utrecht"
],
[
"Woodard",
"R. P.",
"",
"Florda"
]
] | We calculate the one-loop corrections from inflationary gravitons to the electromagnetic fields of a point charge and a point magnetic dipole on a locally de Sitter space background. Results are obtained both for an observer at rest in co-moving coordinates, whose physical distance from the sources increases with the e... |
2001.04981 | Elsayed Lashin Dr. | Asmaa Abdel Azim, Adel Awad, E. I. Lashin | Degenerate Bogdanov-Takens bifurcations in a bulk viscous cosmology | 46 pages, 21 figures, 4 tables, typos are corrected | Eur. Phys. J. C (2020) 80: 868 | 10.1140/epjc/s10052-020-8384-x | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the dynamical system theory we show that the Friedmann-Robertson-Walker
(FRW) cosmological model with bulk viscous fluid in the presence of
cosmological constant is equivalent to a degenerate two dimensional
Bogdanov-Takens normal form. The equation of state parameter, $\omega$, the
bulk viscosity coefficient, ... | [
{
"created": "Tue, 14 Jan 2020 18:09:36 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Jan 2020 01:34:00 GMT",
"version": "v2"
},
{
"created": "Sat, 29 Aug 2020 00:30:18 GMT",
"version": "v3"
},
{
"created": "Thu, 15 Oct 2020 18:01:25 GMT",
"version": "v4"
}
] | 2020-10-19 | [
[
"Azim",
"Asmaa Abdel",
""
],
[
"Awad",
"Adel",
""
],
[
"Lashin",
"E. I.",
""
]
] | Using the dynamical system theory we show that the Friedmann-Robertson-Walker (FRW) cosmological model with bulk viscous fluid in the presence of cosmological constant is equivalent to a degenerate two dimensional Bogdanov-Takens normal form. The equation of state parameter, $\omega$, the bulk viscosity coefficient, $\... |
1005.0619 | Sanved Kolekar | Sanved Kolekar and T. Padmanabhan | Holography in Action | 12 pages | Phys.Rev.D82:024036,2010 | 10.1103/PhysRevD.82.024036 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Einstein-Hilbert action and its natural generalizations to higher dimensions
(like the Lanczos-Lovelock action) have certain peculiar features. All of them
can be separated into a bulk and a surface term, with a specific
("holographic") relationship between the two, so that either term can be used
to extract informat... | [
{
"created": "Tue, 4 May 2010 20:00:10 GMT",
"version": "v1"
}
] | 2010-08-06 | [
[
"Kolekar",
"Sanved",
""
],
[
"Padmanabhan",
"T.",
""
]
] | Einstein-Hilbert action and its natural generalizations to higher dimensions (like the Lanczos-Lovelock action) have certain peculiar features. All of them can be separated into a bulk and a surface term, with a specific ("holographic") relationship between the two, so that either term can be used to extract informatio... |
2209.00090 | Oswaldo Vazquez | Oswaldo Vazquez and Puskar Mondal | Continuation Criterion For Solutions To The Einstein Equations | Revamped manuscript | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove a continuation condition in the context of 3+1 dimensional vacuum
Einstein gravity in Constant Mean extrinsic Curvature (CMC) gauge. More
precisely, we obtain quantitative criteria under which the physical spacetime
can be extended in the future indefinitely as a solution to the Cauchy problem
of the Einstei... | [
{
"created": "Wed, 31 Aug 2022 19:54:13 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Sep 2022 20:07:20 GMT",
"version": "v2"
},
{
"created": "Sat, 24 Sep 2022 00:20:55 GMT",
"version": "v3"
},
{
"created": "Fri, 30 Sep 2022 22:17:36 GMT",
"version": "v4"
},
{
"cr... | 2023-10-10 | [
[
"Vazquez",
"Oswaldo",
""
],
[
"Mondal",
"Puskar",
""
]
] | We prove a continuation condition in the context of 3+1 dimensional vacuum Einstein gravity in Constant Mean extrinsic Curvature (CMC) gauge. More precisely, we obtain quantitative criteria under which the physical spacetime can be extended in the future indefinitely as a solution to the Cauchy problem of the Einstein ... |
0803.1817 | Daniel Pollack | Piotr T. Chrusciel, Frank Pacard and Daniel Pollack | Singular Yamabe metrics and initial data with exactly
Kottler-Schwarzschild-de Sitter ends II. Generic metrics | 7 pages | null | null | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a gluing construction which adds, via a localized deformation,
exactly Delaunay ends to generic metrics with constant positive scalar
curvature. This provides time-symmetric initial data sets for the vacuum
Einstein equations with positive cosmological constant with exactly
Kottler-Schwarzschild-de Sitter ... | [
{
"created": "Wed, 12 Mar 2008 17:15:10 GMT",
"version": "v1"
}
] | 2008-03-13 | [
[
"Chrusciel",
"Piotr T.",
""
],
[
"Pacard",
"Frank",
""
],
[
"Pollack",
"Daniel",
""
]
] | We present a gluing construction which adds, via a localized deformation, exactly Delaunay ends to generic metrics with constant positive scalar curvature. This provides time-symmetric initial data sets for the vacuum Einstein equations with positive cosmological constant with exactly Kottler-Schwarzschild-de Sitter en... |
2308.02936 | Aysha Bibi | Muhammad Naeem and Aysha Bibi | Correction to the Friedmann equation with Sharma-Mittal entropy: A new
perspective on cosmology | 14 pages | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | As the black hole entropy does not obey the area law on it. The area law,
given by $S\sim A^\delta\text{or}A^R$, where $\delta$ and $R$ , for
$0\leq\delta\leq 1$, $0<R\leq 1$, indicates the amount of quantum gravitational
deformation effects. This shows that gravity and thermodynamics are closely
related. Based on th... | [
{
"created": "Sat, 5 Aug 2023 18:33:06 GMT",
"version": "v1"
}
] | 2023-08-08 | [
[
"Naeem",
"Muhammad",
""
],
[
"Bibi",
"Aysha",
""
]
] | As the black hole entropy does not obey the area law on it. The area law, given by $S\sim A^\delta\text{or}A^R$, where $\delta$ and $R$ , for $0\leq\delta\leq 1$, $0<R\leq 1$, indicates the amount of quantum gravitational deformation effects. This shows that gravity and thermodynamics are closely related. Based on this... |
1904.01658 | Hideki Maeda | Hideki Maeda, Cristian Martinez | Higher-dimensional Buchdahl and Janis-Robinson-Winicour transformations
in the Einstein-Maxwell system with a massless scalar field | 21 pages, no figure; v2, extended version, title changed to be more
specific, four-dimensional cylindrically symmetric solutions added | Class. Quantum Grav. 36 185017 (2019) | 10.1088/1361-6382/ab293a | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present higher-dimensional generalizations of the Buchdahl and
Janis-Robinson-Winicour transformations which generate static solutions in the
Einstein-Maxwell system with a massless scalar field. While the former adds a
nontrivial scalar field to a vacuum solution, the latter generates a charged
solution from a ne... | [
{
"created": "Tue, 2 Apr 2019 20:33:05 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Apr 2019 10:47:50 GMT",
"version": "v2"
}
] | 2021-11-02 | [
[
"Maeda",
"Hideki",
""
],
[
"Martinez",
"Cristian",
""
]
] | We present higher-dimensional generalizations of the Buchdahl and Janis-Robinson-Winicour transformations which generate static solutions in the Einstein-Maxwell system with a massless scalar field. While the former adds a nontrivial scalar field to a vacuum solution, the latter generates a charged solution from a neut... |
gr-qc/0410119 | Kirill Bronnikov | K. A. Bronnikov | Nonsingular multidimensional cosmologies with Lobachevsky spatial
sections | 10 pages, submitted to Proc. Int. School GAS04, Kiten, Bulgaria, June
10-16, 2004 | null | null | null | gr-qc | null | Examples of nonsingular cosmological models are presented on the basis of
exact solutions to multidimensional gravity equations. These examples involve
pure imaginary scalar fields, or, in other terms, ``phantom'' fields with an
unusual sign of the kinetic term in the Lagrangian. We show that, with such
fields, hyper... | [
{
"created": "Sat, 23 Oct 2004 17:26:45 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bronnikov",
"K. A.",
""
]
] | Examples of nonsingular cosmological models are presented on the basis of exact solutions to multidimensional gravity equations. These examples involve pure imaginary scalar fields, or, in other terms, ``phantom'' fields with an unusual sign of the kinetic term in the Lagrangian. We show that, with such fields, hyperbo... |
gr-qc/0503016 | Luciano Rezzolla | L. Baiotti, I. Hawke, L. Rezzolla and E. Schnetter | Gravitational-Wave Emission from Rotating Gravitational Collapse in
three Dimensions | 4 pages, Phys. Rev. Lett., in press | Phys.Rev.Lett. 94 (2005) 131101 | 10.1103/PhysRevLett.94.131101 | null | gr-qc astro-ph | null | We present the first calculation of gravitational wave emission produced in
the gravitational collapse of uniformly rotating neutron stars to black holes
in fully three-dimensional simulations. The initial stellar models are
relativistic polytropes which are dynamically unstable and with angular
velocities ranging fr... | [
{
"created": "Fri, 4 Mar 2005 09:13:35 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Baiotti",
"L.",
""
],
[
"Hawke",
"I.",
""
],
[
"Rezzolla",
"L.",
""
],
[
"Schnetter",
"E.",
""
]
] | We present the first calculation of gravitational wave emission produced in the gravitational collapse of uniformly rotating neutron stars to black holes in fully three-dimensional simulations. The initial stellar models are relativistic polytropes which are dynamically unstable and with angular velocities ranging from... |
gr-qc/0411028 | Giovanni Montani | Emanuele Alesci and Giovanni Montani | Phenomenology for an extra-dimension from gravitational waves
propagation on a Kaluza-Klein space-time | 21 pages, 2 figures, to appear on Int. Journ. Mod. Phys. D | Int.J.Mod.Phys. D14 (2005) 1-22 | 10.1142/S0218271805005931 | null | gr-qc | null | In the present work we analize the behavior of 5-dimensional gravitational
waves propagating on a Kaluza-Klein background and we face separately the two
cases in which respectively the waves are generated before and after the
process of dimensional compactification. We show that if the waves are
originated on a 5-d s... | [
{
"created": "Fri, 5 Nov 2004 14:11:39 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Alesci",
"Emanuele",
""
],
[
"Montani",
"Giovanni",
""
]
] | In the present work we analize the behavior of 5-dimensional gravitational waves propagating on a Kaluza-Klein background and we face separately the two cases in which respectively the waves are generated before and after the process of dimensional compactification. We show that if the waves are originated on a 5-d spa... |
2203.01773 | M. Alessandra Papa | P. B. Covas, M. A. Papa, R. Prix and B. J. Owen | Constraints on r-modes and mountains on millisecond neutron stars in
binary systems | Accepted for publication in The Astrophysical Journal Letters | null | 10.3847/2041-8213/ac62d7 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Continuous gravitational waves are nearly monochromatic signals emitted by
asymmetries in rotating neutron stars. These signals have not yet been
detected. Deep all-sky searches for continuous gravitational waves from
isolated neutron stars require significant computational expense. Deep searches
for neutron stars in... | [
{
"created": "Thu, 3 Mar 2022 15:40:27 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Mar 2022 14:27:46 GMT",
"version": "v2"
},
{
"created": "Thu, 31 Mar 2022 11:26:13 GMT",
"version": "v3"
}
] | 2022-04-27 | [
[
"Covas",
"P. B.",
""
],
[
"Papa",
"M. A.",
""
],
[
"Prix",
"R.",
""
],
[
"Owen",
"B. J.",
""
]
] | Continuous gravitational waves are nearly monochromatic signals emitted by asymmetries in rotating neutron stars. These signals have not yet been detected. Deep all-sky searches for continuous gravitational waves from isolated neutron stars require significant computational expense. Deep searches for neutron stars in b... |
1506.02213 | Inyong Cho | Inyong Cho, Naveen K. Singh | Primordial Power Spectra of EiBI Inflation in Strong Gravity Limit | 10 pages, 1 figure | null | 10.1103/PhysRevD.92.024038 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the scalar and the tensor perturbations of the $\varphi^2$
inflation model in the strong-gravity limit of Eddington-inspired Born-Infeld
(EiBI) theory. In order to consider the strong EiBI-gravity effect, we take the
value of $\kappa$ large, where $\kappa$ is the EiBI theory parameter. The
energy densi... | [
{
"created": "Sun, 7 Jun 2015 02:54:28 GMT",
"version": "v1"
}
] | 2015-08-06 | [
[
"Cho",
"Inyong",
""
],
[
"Singh",
"Naveen K.",
""
]
] | We investigate the scalar and the tensor perturbations of the $\varphi^2$ inflation model in the strong-gravity limit of Eddington-inspired Born-Infeld (EiBI) theory. In order to consider the strong EiBI-gravity effect, we take the value of $\kappa$ large, where $\kappa$ is the EiBI theory parameter. The energy density... |
gr-qc/9312014 | Andrew Matacz | Be-lok Hu, G. Kang and Andrew Matacz | Squeezed Vacua and the Quantum Statistics of Cosmological Particle
Creation | 19 pages in latex. To appear in IJMPA | Int.J.Mod.Phys.A9:991-1008,1994 | 10.1142/S0217751X94000455 | null | gr-qc | null | We use the language of squeezed states to give a systematic description of
two issues in cosmological particle creation: a) Dependence of particle
creation on the initial state specified. We consider in particular the number
state, the coherent and the squeezed state. b) The relation of spontaneous and
stimulated par... | [
{
"created": "Wed, 8 Dec 1993 03:26:09 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Hu",
"Be-lok",
""
],
[
"Kang",
"G.",
""
],
[
"Matacz",
"Andrew",
""
]
] | We use the language of squeezed states to give a systematic description of two issues in cosmological particle creation: a) Dependence of particle creation on the initial state specified. We consider in particular the number state, the coherent and the squeezed state. b) The relation of spontaneous and stimulated parti... |
gr-qc/0211045 | Belkis Cabrera Palmer | Belkis Cabrera Palmer and Donald Marolf | On Fast Travel through spherically symmetric spacetimes | 21 pages, 2 figures, minor changes, typos fixed, references added | Phys.Rev. D67 (2003) 044012 | 10.1103/PhysRevD.67.044012 | SU-GP-02/11-2 | gr-qc hep-th | null | In a static spacetime, the Killing time can be used to measure the time
required for signals or objects to propagate between two of its orbits. By
further restricting to spherically symmetric cases, one obtains a natural
association between these orbits and timelike lines in Minkowski space. We
prove a simple theorem... | [
{
"created": "Tue, 12 Nov 2002 17:33:58 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Nov 2002 00:15:22 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Palmer",
"Belkis Cabrera",
""
],
[
"Marolf",
"Donald",
""
]
] | In a static spacetime, the Killing time can be used to measure the time required for signals or objects to propagate between two of its orbits. By further restricting to spherically symmetric cases, one obtains a natural association between these orbits and timelike lines in Minkowski space. We prove a simple theorem t... |
1502.07679 | Ahmet Mecit \"Ozta\c{s} | Ahmet Mecit Oztas and Michael L. Smith | Elliptical Solutions to the Standard Cosmology Model with Realistic
Values of Matter Density | 14 pages including 5 figures | International Journal of Theoretical Physics, 45(5) pp. 925-936
(2006) | 10.1007/s10773-006-9082-7 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have examined a solution to the FRW model of the Einstein and de Sitter
Universe, often termed the standard model of cosmology, using wide values for
the normalized cosmological constant Omega_L and spacetime curvature Omega_k
with proposed values of normalized matter density. These solutions were
evaluated using ... | [
{
"created": "Sat, 21 Feb 2015 15:38:45 GMT",
"version": "v1"
}
] | 2015-02-27 | [
[
"Oztas",
"Ahmet Mecit",
""
],
[
"Smith",
"Michael L.",
""
]
] | We have examined a solution to the FRW model of the Einstein and de Sitter Universe, often termed the standard model of cosmology, using wide values for the normalized cosmological constant Omega_L and spacetime curvature Omega_k with proposed values of normalized matter density. These solutions were evaluated using a ... |
1803.06327 | Selman Ipek | Selman Ipek, Mohammad Abedi, Ariel Caticha | A Covariant Approach to Entropic Dynamics | An extended version of work presented at MaxEnt 2016, the 36th
International Workshop on Bayesian Inference and Maximum Entropy Methods in
Science and Engineering; July 10-15 2016, Ghent, Belgium | null | null | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Entropic Dynamics (ED) is a framework for constructing dynamical theories of
inference using the tools of inductive reasoning. A central feature of the ED
framework is the special focus placed on time. In previous work a global
entropic time was used to derive a quantum theory of relativistic scalar
fields. This theo... | [
{
"created": "Fri, 16 Mar 2018 17:30:08 GMT",
"version": "v1"
}
] | 2018-03-19 | [
[
"Ipek",
"Selman",
""
],
[
"Abedi",
"Mohammad",
""
],
[
"Caticha",
"Ariel",
""
]
] | Entropic Dynamics (ED) is a framework for constructing dynamical theories of inference using the tools of inductive reasoning. A central feature of the ED framework is the special focus placed on time. In previous work a global entropic time was used to derive a quantum theory of relativistic scalar fields. This theory... |
0704.0797 | Roland Haas | Roland Haas | Scalar self-force on eccentric geodesics in Schwarzschild spacetime: a
time-domain computation | 18 pages, 18 figures, RevTeX4 some typos fixed, published version | Phys.Rev.D75:124011,2007 | 10.1103/PhysRevD.75.124011 | null | gr-qc | null | We calculate the self-force acting on a particle with scalar charge moving on
a generic geodesic around a Schwarzschild black hole. This calculation requires
an accurate computation of the retarded scalar field produced by the moving
charge; this is done numerically with the help of a fourth-order convergent
finite-d... | [
{
"created": "Thu, 5 Apr 2007 20:22:54 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Jul 2007 15:52:46 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Haas",
"Roland",
""
]
] | We calculate the self-force acting on a particle with scalar charge moving on a generic geodesic around a Schwarzschild black hole. This calculation requires an accurate computation of the retarded scalar field produced by the moving charge; this is done numerically with the help of a fourth-order convergent finite-dif... |
2305.16237 | Kristina Giesel | Kristina Giesel, Andreas Leitherer and David Winnekens | A reduced phase space quantisation of a model in Algebraic Quantum
Gravity with polarised $T^3$ Gowdy symmetry | 54 pages, 5 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a reduced phase space quantisation of a model with $T^3$ Gowdy
symmetry in which gravity has been coupled to Gaussian dust. We complete the
quantisation programme in reduced loop quantum gravity (LQG) as well as
algebraic quantum gravity (AQG) and derive a Schr\"odinger-like equation with a
physical Hamil... | [
{
"created": "Thu, 25 May 2023 16:48:09 GMT",
"version": "v1"
}
] | 2023-05-26 | [
[
"Giesel",
"Kristina",
""
],
[
"Leitherer",
"Andreas",
""
],
[
"Winnekens",
"David",
""
]
] | We consider a reduced phase space quantisation of a model with $T^3$ Gowdy symmetry in which gravity has been coupled to Gaussian dust. We complete the quantisation programme in reduced loop quantum gravity (LQG) as well as algebraic quantum gravity (AQG) and derive a Schr\"odinger-like equation with a physical Hamilto... |
0902.0973 | Gustav Holzegel | Gustav Holzegel | On the massive wave equation on slowly rotating Kerr-AdS spacetimes | 1 figure; typos corrected, references added, introduction revised; to
appear in CMP | Commun.Math.Phys.294:169-197,2010 | 10.1007/s00220-009-0935-9 | null | gr-qc math.AP math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The massive wave equation $\Box_g \psi - \alpha\frac{\Lambda}{3} \psi = 0$ is
studied on a fixed Kerr-anti de Sitter background
$(\mathcal{M},g_{M,a,\Lambda})$. We first prove that in the Schwarzschild case
(a=0), $\psi$ remains uniformly bounded on the black hole exterior provided
that $\alpha < {9/4}$, i.e. the Bre... | [
{
"created": "Thu, 5 Feb 2009 20:47:21 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Aug 2009 13:21:47 GMT",
"version": "v2"
}
] | 2014-11-18 | [
[
"Holzegel",
"Gustav",
""
]
] | The massive wave equation $\Box_g \psi - \alpha\frac{\Lambda}{3} \psi = 0$ is studied on a fixed Kerr-anti de Sitter background $(\mathcal{M},g_{M,a,\Lambda})$. We first prove that in the Schwarzschild case (a=0), $\psi$ remains uniformly bounded on the black hole exterior provided that $\alpha < {9/4}$, i.e. the Breit... |
2304.01059 | Zun Wang | Yi Wang and Zun Wang | Decoupling between gravitationally bounded systems and the cosmic
expansion | 14 pages, 2 figures, | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Recently, it was hypothesized that some supermassive black holes (SMBHs) may
couple to the cosmic expansion. The mass of these SMBHs increase as the cubic
power of the cosmic scale factor, leaving the energy density of the SMBHs
unchanged when the universe expands. However, following general principles of
general rel... | [
{
"created": "Mon, 3 Apr 2023 15:07:26 GMT",
"version": "v1"
}
] | 2023-04-04 | [
[
"Wang",
"Yi",
""
],
[
"Wang",
"Zun",
""
]
] | Recently, it was hypothesized that some supermassive black holes (SMBHs) may couple to the cosmic expansion. The mass of these SMBHs increase as the cubic power of the cosmic scale factor, leaving the energy density of the SMBHs unchanged when the universe expands. However, following general principles of general relat... |
1303.1408 | Jose M. M. Senovilla | Jos\'e M. M. Senovilla | Junction conditions for F(R)-gravity and their consequences | 24 pages, no figures. Enlarged version with new material. An
exceptional case allowing for a discontinuous R is included. Paper
reorganized and rewritten to make the content clearer. References added.
Appendix added | null | 10.1103/PhysRevD.88.064015 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I present the junction conditions for F(R) theories of gravity and their
implications: the generalized Israel conditions and equations. These junction
conditions are necessary to construct global models of stars, galaxies, etc.,
where a vacuum region surrounds a finite body in equilibrium, as well as to
describe shel... | [
{
"created": "Wed, 6 Mar 2013 18:09:37 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Mar 2013 17:15:28 GMT",
"version": "v2"
},
{
"created": "Wed, 20 Mar 2013 12:04:18 GMT",
"version": "v3"
},
{
"created": "Tue, 4 Jun 2013 10:09:01 GMT",
"version": "v4"
}
] | 2013-09-11 | [
[
"Senovilla",
"José M. M.",
""
]
] | I present the junction conditions for F(R) theories of gravity and their implications: the generalized Israel conditions and equations. These junction conditions are necessary to construct global models of stars, galaxies, etc., where a vacuum region surrounds a finite body in equilibrium, as well as to describe shells... |
2302.04874 | Pradip Kumar Chattopadhyay Dr. | D. Bhattacharjee, P. K. Chattopadhyay and B. C. Paul | Stable Gravastar model in Cylindrically Symmetric Space-time | 14 pages, 8 figures | Phys. Dark Universe 43, 101411 (2024) | 10.1016/j.dark.2023.101411 | null | gr-qc | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We represent a class of new Gravastar solutions as obtained by Mazur and
Mottola in a gravitational Bose-Einstein condensate (GBEC) in a cylindrical
symmetric space-time. A stable gravastar with three distinct regions namely,
(i) Interior de-Sitter space, (ii) Intermediate thin shell with a slice of
finite length and... | [
{
"created": "Thu, 9 Feb 2023 15:20:56 GMT",
"version": "v1"
}
] | 2023-12-27 | [
[
"Bhattacharjee",
"D.",
""
],
[
"Chattopadhyay",
"P. K.",
""
],
[
"Paul",
"B. C.",
""
]
] | We represent a class of new Gravastar solutions as obtained by Mazur and Mottola in a gravitational Bose-Einstein condensate (GBEC) in a cylindrical symmetric space-time. A stable gravastar with three distinct regions namely, (i) Interior de-Sitter space, (ii) Intermediate thin shell with a slice of finite length and (... |
2211.05055 | Anton Sheykin | A. A. Sheykin, A. A. Grechko | Lower-dimensional Regge-Teitelboim gravity | 5 pages. Accepted for publication in Gravitation & Cosmology | null | 10.1134/S0202289323010097 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study modified gravity theory known as Regge-Teitelboim approach, in which
the gravity is represented by dynamics of a surface isometrically embedded in a
flat bulk. We obtain some particular solutions of Regge-Teitelboim equations
corresponding to a central symmetric vacuum 2+1-dimensional spacetime. In
contrast ... | [
{
"created": "Wed, 9 Nov 2022 17:40:19 GMT",
"version": "v1"
}
] | 2023-04-12 | [
[
"Sheykin",
"A. A.",
""
],
[
"Grechko",
"A. A.",
""
]
] | We study modified gravity theory known as Regge-Teitelboim approach, in which the gravity is represented by dynamics of a surface isometrically embedded in a flat bulk. We obtain some particular solutions of Regge-Teitelboim equations corresponding to a central symmetric vacuum 2+1-dimensional spacetime. In contrast wi... |
2406.02367 | Julius Lehmann | Julius Lehmann | A Note on and Generalization of "Exploring Modified Kaniadakis Entropy:
MOND Theory and the Bekenstein Bound Conjecture" | 9 pages, no figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In a recent paper by Ambr\'osio et al. [arXiv:2405.14799], it was shown that
the gravitational force law of the Modified Newtonian Dynamics (MOND)
phenomenology can be derived within the framework of entropic gravity and the
holographic principle by assuming an entropy function other than the
conventional Boltzmann-G... | [
{
"created": "Tue, 4 Jun 2024 14:45:59 GMT",
"version": "v1"
}
] | 2024-06-05 | [
[
"Lehmann",
"Julius",
""
]
] | In a recent paper by Ambr\'osio et al. [arXiv:2405.14799], it was shown that the gravitational force law of the Modified Newtonian Dynamics (MOND) phenomenology can be derived within the framework of entropic gravity and the holographic principle by assuming an entropy function other than the conventional Boltzmann-Gib... |
0806.3017 | Lorenzo Iorio | Lorenzo Iorio | Classical and relativistic orbital motions around a mass-varying body | LaTex, 27 pages, no tables, 7 figures, 31 references. To appear in
Scholarly Research Exchange (SRX Physics) | SRX Physics Volume 2010 (2010), Article ID 261249 | 10.3814/2010/261249 | null | gr-qc astro-ph physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I calculate the classical effects induced by an isotropic mass loss of a body
on the orbital motion of a test particle around it; the present analysis is
also valid for a variation of the Newtonian constant of gravitation. I
perturbatively obtain negative secular rates for the osculating semimajor axis,
the eccentric... | [
{
"created": "Wed, 18 Jun 2008 14:36:47 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Jul 2008 13:59:00 GMT",
"version": "v2"
},
{
"created": "Mon, 14 Jul 2008 19:08:09 GMT",
"version": "v3"
},
{
"created": "Sat, 4 Oct 2008 20:03:13 GMT",
"version": "v4"
},
{
"cre... | 2009-12-31 | [
[
"Iorio",
"Lorenzo",
""
]
] | I calculate the classical effects induced by an isotropic mass loss of a body on the orbital motion of a test particle around it; the present analysis is also valid for a variation of the Newtonian constant of gravitation. I perturbatively obtain negative secular rates for the osculating semimajor axis, the eccentricit... |
0904.1685 | Merab Gogberashvili Dr | Merab Gogberashvili | Topological Solution to the Cylindrical Einstein-Maxwell Equations | 6 pages, the version accepted by Int. J Mod. Phys. D | Int.J.Mod.Phys.D18:1765-1771,2009 | 10.1142/S0218271809015308 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New exact solution of the cylindrically symmetric Einstein-Maxwell equations
is presented. The solution is singular on the axis of symmetry and at the
radial infinity, where sources should be placed. The accepted source at the
origin can be interpreted as a charged domain wall shell.
| [
{
"created": "Fri, 10 Apr 2009 12:59:57 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Oct 2009 06:20:56 GMT",
"version": "v2"
}
] | 2009-12-04 | [
[
"Gogberashvili",
"Merab",
""
]
] | New exact solution of the cylindrically symmetric Einstein-Maxwell equations is presented. The solution is singular on the axis of symmetry and at the radial infinity, where sources should be placed. The accepted source at the origin can be interpreted as a charged domain wall shell. |
1401.0528 | Paolo Pani | Vitor Cardoso, Paolo Pani, Joao Rico | On generic parametrizations of spinning black-hole geometries | 8 pages, 2 figures. v2: extended discussion, to appear in Phys. Rev.
D | Phys. Rev. D 89, 064007 (2014) | 10.1103/PhysRevD.89.064007 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The construction of a generic parametrization of spinning geometries which
can be matched continuously to the Kerr metric is an important open problem in
General Relativity. Its resolution is more than of academic interest, as it
allows to parametrize and quantify possible deviations from the no-hair
theorem. Various... | [
{
"created": "Thu, 2 Jan 2014 20:51:02 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Feb 2014 16:54:26 GMT",
"version": "v2"
}
] | 2014-05-30 | [
[
"Cardoso",
"Vitor",
""
],
[
"Pani",
"Paolo",
""
],
[
"Rico",
"Joao",
""
]
] | The construction of a generic parametrization of spinning geometries which can be matched continuously to the Kerr metric is an important open problem in General Relativity. Its resolution is more than of academic interest, as it allows to parametrize and quantify possible deviations from the no-hair theorem. Various a... |
gr-qc/9312008 | null | Guido Magnano and Leszek M. Sokolowski | On Physical Equivalence between Nonlinear Gravity Theories | 37 pp., TO-JLL-P 3/93 Dec 1993 | Phys.Rev.D50:5039-5059,1994 | 10.1103/PhysRevD.50.5039 | null | gr-qc | null | We argue that in a nonlinear gravity theory, which according to well-known
results is dynamically equivalent to a self-gravitating scalar field in General
Relativity, the true physical variables are exactly those which describe the
equivalent general-relativistic model (these variables are known as Einstein
frame). W... | [
{
"created": "Fri, 3 Dec 1993 18:01:47 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Magnano",
"Guido",
""
],
[
"Sokolowski",
"Leszek M.",
""
]
] | We argue that in a nonlinear gravity theory, which according to well-known results is dynamically equivalent to a self-gravitating scalar field in General Relativity, the true physical variables are exactly those which describe the equivalent general-relativistic model (these variables are known as Einstein frame). Whe... |
1904.11814 | Yannick Boetzel | Yannick Boetzel, Chandra Kant Mishra, Guillaume Faye, Achamveedu
Gopakumar, Bala R. Iyer | Gravitational-wave amplitudes for compact binaries in eccentric orbits
at the third post-Newtonian order: Tail contributions and post-adiabatic
corrections | 17 pages | Phys. Rev. D 100, 044018 (2019) | 10.1103/PhysRevD.100.044018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the tail contributions to the gravitational-wave mode amplitudes
for compact binaries in eccentric orbits at the third post-Newtonian order of
general relativity. We combine them with the already available instantaneous
pieces and include the post-adiabatic corrections required to fully account for
the eff... | [
{
"created": "Fri, 26 Apr 2019 12:54:56 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Aug 2019 10:42:46 GMT",
"version": "v2"
},
{
"created": "Sun, 22 Sep 2019 09:51:39 GMT",
"version": "v3"
}
] | 2019-09-24 | [
[
"Boetzel",
"Yannick",
""
],
[
"Mishra",
"Chandra Kant",
""
],
[
"Faye",
"Guillaume",
""
],
[
"Gopakumar",
"Achamveedu",
""
],
[
"Iyer",
"Bala R.",
""
]
] | We compute the tail contributions to the gravitational-wave mode amplitudes for compact binaries in eccentric orbits at the third post-Newtonian order of general relativity. We combine them with the already available instantaneous pieces and include the post-adiabatic corrections required to fully account for the effec... |
2304.12767 | Bo-Qiang Ma | Jie Zhu, Bo-Qiang Ma | Lorentz Violation in Finsler Geometry | 29 pages, no figure, final version for journal publication | Symmetry 15 (2023) 978 | 10.3390/sym15050978 | null | gr-qc astro-ph.HE hep-ph | http://creativecommons.org/licenses/by/4.0/ | Lorentz invariance is one of the foundations of modern physics; however,
Lorentz violation may happen from the perspective of quantum gravity, and
plenty of studies on Lorentz violation have arisen in recent years. As a good
tool to explore Lorentz violation, Finsler geometry is a natural and
fundamental generalizati... | [
{
"created": "Tue, 25 Apr 2023 12:41:07 GMT",
"version": "v1"
},
{
"created": "Tue, 2 May 2023 04:22:05 GMT",
"version": "v2"
}
] | 2023-05-03 | [
[
"Zhu",
"Jie",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] | Lorentz invariance is one of the foundations of modern physics; however, Lorentz violation may happen from the perspective of quantum gravity, and plenty of studies on Lorentz violation have arisen in recent years. As a good tool to explore Lorentz violation, Finsler geometry is a natural and fundamental generalization... |
2002.07550 | Fabrizio Tamburini | Ignazio Licata, Davide Fiscaletti, Leonardo Chiatti and Fabrizio
Tamburini | CPT Symmetry in Projective de Sitter Universes | 7 pages | null | null | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent work, Boyle, Finn and Turok hypothesized a model of universe that
does not violate the CPT-symmetry as alternative for inflation. With this
approach they described the birth of the Universe from a pair of universes, one
the CPT image of the other, living in pre- and post-big bang epochs. The
CPT-invarianc... | [
{
"created": "Tue, 18 Feb 2020 13:36:35 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Feb 2020 09:07:48 GMT",
"version": "v2"
}
] | 2020-02-24 | [
[
"Licata",
"Ignazio",
""
],
[
"Fiscaletti",
"Davide",
""
],
[
"Chiatti",
"Leonardo",
""
],
[
"Tamburini",
"Fabrizio",
""
]
] | In a recent work, Boyle, Finn and Turok hypothesized a model of universe that does not violate the CPT-symmetry as alternative for inflation. With this approach they described the birth of the Universe from a pair of universes, one the CPT image of the other, living in pre- and post-big bang epochs. The CPT-invariance ... |
1202.4750 | Andreas Ross | Andreas Ross | Multipole expansion at the level of the action | 39 pages, some typos corrected, published version | null | 10.1103/PhysRevD.85.125033 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Sources of long wavelength radiation are naturally described by an effective
field theory (EFT) which takes the form of a multipole expansion. Its action is
given by a derivative expansion where higher order terms are suppressed by
powers of the ratio of the size of the source over the wavelength. In order to
determi... | [
{
"created": "Tue, 21 Feb 2012 20:54:20 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Apr 2013 15:26:59 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Ross",
"Andreas",
""
]
] | Sources of long wavelength radiation are naturally described by an effective field theory (EFT) which takes the form of a multipole expansion. Its action is given by a derivative expansion where higher order terms are suppressed by powers of the ratio of the size of the source over the wavelength. In order to determine... |
1506.02139 | Gonzalo Olmo | Gonzalo J. Olmo and D. Rubiera-Garcia | Non-Riemannian geometry: towards new avenues for the physics of modified
gravity | 6 pages. Proceedings of the conference "Spanish Relativity Meeting -
ERE2014", held in Valencia (Spain) | J.Phys.Conf.Ser. 600 (2015) 1, 012041 | 10.1088/1742-6596/600/1/012041 | IFIC/15-56 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Less explored than their metric (Riemannian) counterparts, metric-affine (or
Palatini) theories bring an unexpected phenomenology for gravitational physics
beyond General Relativity. Lessons of crystalline structures, where the
presence of defects in their microstructure requires the use of non-Riemannian
geometry fo... | [
{
"created": "Sat, 6 Jun 2015 12:24:25 GMT",
"version": "v1"
}
] | 2015-07-31 | [
[
"Olmo",
"Gonzalo J.",
""
],
[
"Rubiera-Garcia",
"D.",
""
]
] | Less explored than their metric (Riemannian) counterparts, metric-affine (or Palatini) theories bring an unexpected phenomenology for gravitational physics beyond General Relativity. Lessons of crystalline structures, where the presence of defects in their microstructure requires the use of non-Riemannian geometry for ... |
gr-qc/0501094 | Ricardo Gallego Torrom\'e | Ricardo Gallego Torrom\'e | Emergent phenomenology from deterministic Cartan-Randers systems | minor corrections | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider specific deterministic quantum models of Cartan-Randers type and
show how a dualized abelian gauge symmetry, diffeomorphism invariance, the
Principle of Inertia, reversibility of phenomenological dynamics, maximal
acceleration and maximal propagation speed for matter arise from such models in
an phenomeno... | [
{
"created": "Fri, 28 Jan 2005 17:24:32 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Mar 2005 11:46:10 GMT",
"version": "v2"
},
{
"created": "Mon, 27 Nov 2006 14:47:21 GMT",
"version": "v3"
},
{
"created": "Tue, 5 Dec 2006 14:07:35 GMT",
"version": "v4"
},
{
"cr... | 2020-12-01 | [
[
"Torromé",
"Ricardo Gallego",
""
]
] | We consider specific deterministic quantum models of Cartan-Randers type and show how a dualized abelian gauge symmetry, diffeomorphism invariance, the Principle of Inertia, reversibility of phenomenological dynamics, maximal acceleration and maximal propagation speed for matter arise from such models in an phenomenolo... |
1712.08591 | Dr. Sudhaker Upadhyay | Mir Hameeda, Sudhaker Upadhyay, Mir Faizal, Ahmed F. Ali and Behnam
Pourhassan | Large Distance Modification of Newtonian Potential and Structure
Formation in Universe | 13 pages, 3 captioned figures | Phys. Dark Univ. 19 (2018) 137-143 | 10.1016/j.dark.2018.02.001 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the effects of super-light brane world perturbative
modes on structure formation in our universe. As these modes modify the large
distance behavior of Newtonian potential, they effect the clustering of a
system of galaxies. So, we explicitly calculate the clustering of galaxies
interacting thr... | [
{
"created": "Thu, 21 Dec 2017 14:02:04 GMT",
"version": "v1"
}
] | 2018-02-27 | [
[
"Hameeda",
"Mir",
""
],
[
"Upadhyay",
"Sudhaker",
""
],
[
"Faizal",
"Mir",
""
],
[
"Ali",
"Ahmed F.",
""
],
[
"Pourhassan",
"Behnam",
""
]
] | In this paper, we study the effects of super-light brane world perturbative modes on structure formation in our universe. As these modes modify the large distance behavior of Newtonian potential, they effect the clustering of a system of galaxies. So, we explicitly calculate the clustering of galaxies interacting throu... |
2402.12492 | Behzad Eslam Panah | Behzad Eslam Panah | Analytic Electrically Charged Black Holes in $F(R)$-ModMax Theory | 19 pages, 7 figures, 1 table, minor corrections in the title to match
the published version | Prog. Theor. Exp. Phys. 2024, 023E01 (2024) | 10.1093/ptep/ptae012 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by a new model of nonlinear electrodynamics known as Modified
Maxwell (ModMax) theory, an exact analytical solution for black holes is
obtained by coupling ModMax nonlinear electrodynamics and $F(R)$ gravity. Then,
the effects of the system's parameters ($F(R)$-ModMax gravity parameters) on
the event horizo... | [
{
"created": "Mon, 19 Feb 2024 19:54:38 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Feb 2024 17:51:10 GMT",
"version": "v2"
}
] | 2024-02-26 | [
[
"Panah",
"Behzad Eslam",
""
]
] | Motivated by a new model of nonlinear electrodynamics known as Modified Maxwell (ModMax) theory, an exact analytical solution for black holes is obtained by coupling ModMax nonlinear electrodynamics and $F(R)$ gravity. Then, the effects of the system's parameters ($F(R)$-ModMax gravity parameters) on the event horizons... |
2007.14279 | Bayram Tekin | Emel Altas and Bayram Tekin | Bowen-York Model Solution Redux | 10 pages, matches the improved, published version | Eur. Phys. J. C 81, 328 (2021) | 10.1140/epjc/s10052-021-09139-z | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Initial value problem in General Relativity is often solved numerically; with
only a few exceptions one of which is the "model" solution of Bowen and York
where an analytical form of the solution is available. The solution describes a
dynamical, time-asymmetric, gravitating system with mass and linear momentum.
Here ... | [
{
"created": "Tue, 28 Jul 2020 14:50:36 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Apr 2021 07:26:55 GMT",
"version": "v2"
}
] | 2021-04-20 | [
[
"Altas",
"Emel",
""
],
[
"Tekin",
"Bayram",
""
]
] | Initial value problem in General Relativity is often solved numerically; with only a few exceptions one of which is the "model" solution of Bowen and York where an analytical form of the solution is available. The solution describes a dynamical, time-asymmetric, gravitating system with mass and linear momentum. Here we... |
1408.1698 | Shuang-Yong Zhou | Thomas P. Sotiriou and Shuang-Yong Zhou | Black hole hair in generalized scalar-tensor gravity: An explicit
example | 16 pages, 9 figures, typos corrected, minor changes, to appear in PRD | Phys.Rev. D90 (2014) 12, 124063 | 10.1103/PhysRevD.90.124063 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent Letter we have shown that in shift-symmetric Horndeski theory the
scalar field is forced to obtain a nontrivial configuration in black hole
spacetimes, unless a linear coupling with the Gauss-Bonnet invariant is tuned
away. As a result, black holes generically have hair in this theory. In this
companion p... | [
{
"created": "Thu, 7 Aug 2014 20:00:04 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Nov 2014 21:21:37 GMT",
"version": "v2"
}
] | 2016-02-12 | [
[
"Sotiriou",
"Thomas P.",
""
],
[
"Zhou",
"Shuang-Yong",
""
]
] | In a recent Letter we have shown that in shift-symmetric Horndeski theory the scalar field is forced to obtain a nontrivial configuration in black hole spacetimes, unless a linear coupling with the Gauss-Bonnet invariant is tuned away. As a result, black holes generically have hair in this theory. In this companion pap... |
1011.3304 | Victor Shchigolev Konstantinovich | V.K. Shchigolev | Cosmological Models with Fractional Derivatives and Fractional Action
Functional | 14 pages | Commun.Theor.Phys.56:389-396,2011 | 10.1088/0253-6102/56/2/34 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmological models of a scalar field with dynamical equations containing
fractional derivatives or derived from the Einstein-Hilbert action of
fractional order, are constructed. A number of exact solutions to those
equations of fractional cosmological models in both cases is given.
| [
{
"created": "Mon, 15 Nov 2010 07:24:31 GMT",
"version": "v1"
}
] | 2011-08-22 | [
[
"Shchigolev",
"V. K.",
""
]
] | Cosmological models of a scalar field with dynamical equations containing fractional derivatives or derived from the Einstein-Hilbert action of fractional order, are constructed. A number of exact solutions to those equations of fractional cosmological models in both cases is given. |
gr-qc/0606124 | Clemens Heuson | Clemens Heuson | Quantisation of Deformed Special Relativity | 10 pages, no figures | null | null | null | gr-qc | null | We consider deformed special relativity (DSR) theories on commutative
space-time, perhaps as an first approximation to a noncommutative space-time
formulation. The corresponding field theories in general possess derivatives of
all orders. From a quantisation procedure and the deformed Dirac equation in
momentum space... | [
{
"created": "Thu, 29 Jun 2006 09:30:10 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Heuson",
"Clemens",
""
]
] | We consider deformed special relativity (DSR) theories on commutative space-time, perhaps as an first approximation to a noncommutative space-time formulation. The corresponding field theories in general possess derivatives of all orders. From a quantisation procedure and the deformed Dirac equation in momentum space w... |
1702.02053 | Tim Dietrich | Tim Dietrich and Tanja Hinderer | Comprehensive numerical relativity -- effective-one-body comparison to
inform improvements in waveform models for binary neutron star systems | 22 pages, 13 figures | Phys. Rev. D 95, 124006 (2017) | 10.1103/PhysRevD.95.124006 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a detailed comparison between tidal effective-one-body (EOB)
models and new state-of-the-art numerical relativity simulations for
non-spinning binary neutron star systems. This comparison is the most extensive
one to date, covering a wide range in the parameter space and encompassing the
energetics of the ... | [
{
"created": "Tue, 7 Feb 2017 15:06:22 GMT",
"version": "v1"
}
] | 2017-06-14 | [
[
"Dietrich",
"Tim",
""
],
[
"Hinderer",
"Tanja",
""
]
] | We present a detailed comparison between tidal effective-one-body (EOB) models and new state-of-the-art numerical relativity simulations for non-spinning binary neutron star systems. This comparison is the most extensive one to date, covering a wide range in the parameter space and encompassing the energetics of the bi... |
gr-qc/0410035 | Allen Everett | Allen Everett (Tufts University) | Time travel paradoxes, path integrals, and the many worlds
interpretation of quantum mechanics | no figures | Phys.Rev. D69 (2004) 124023 | 10.1103/PhysRevD.69.124023 | null | gr-qc | null | We consider two approaches to evading paradoxes in quantum mechanics with
closed timelike curves (CTCs). In a model similar to Politzer's, assuming pure
states and using path integrals, we show that the problems of paradoxes and of
unitarity violation are related; preserving unitarity avoids paradoxes by
modifying th... | [
{
"created": "Thu, 7 Oct 2004 19:53:37 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Everett",
"Allen",
"",
"Tufts University"
]
] | We consider two approaches to evading paradoxes in quantum mechanics with closed timelike curves (CTCs). In a model similar to Politzer's, assuming pure states and using path integrals, we show that the problems of paradoxes and of unitarity violation are related; preserving unitarity avoids paradoxes by modifying the ... |
0812.0618 | Yun Soo Myung | Yun Soo Myung | Thermodynamics of Chaplygin gas | 5 pages, 4 figures, version "Accepted for publication in Astrophysics
& Space Science" | Astrophys.Space Sci.335:561-564,2011 | 10.1007/s10509-011-0743-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We clarify thermodynamics of the Chaplygin gas by introducing the
integrability condition. All thermal quantities are derived as functions of
either volume or temperature. Importantly, we find a new general equation of
state, describing the Chaplygin gas completely. We confirm that the Chaplygin
gas could show a unif... | [
{
"created": "Tue, 2 Dec 2008 23:25:47 GMT",
"version": "v1"
},
{
"created": "Wed, 11 May 2011 06:10:23 GMT",
"version": "v2"
}
] | 2011-09-12 | [
[
"Myung",
"Yun Soo",
""
]
] | We clarify thermodynamics of the Chaplygin gas by introducing the integrability condition. All thermal quantities are derived as functions of either volume or temperature. Importantly, we find a new general equation of state, describing the Chaplygin gas completely. We confirm that the Chaplygin gas could show a unifie... |
1007.3222 | Yuri Pavlov | A.A. Grib, Yu.V. Pavlov | On particle collisions near Kerr's black holes | LATEX, 4 pages, 1 figure. arXiv admin note: substantial text overlap
with arXiv:1004.0913 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scattering of particles in the gravitational field of rotating black holes is
considered. Expressions for scattering energy of particles in the centre of
mass system are obtained. It is shown that scattering energy of particles in
the centre of mass system can obtain very large values not only for extremal
black hole... | [
{
"created": "Mon, 19 Jul 2010 17:51:31 GMT",
"version": "v1"
}
] | 2014-11-05 | [
[
"Grib",
"A. A.",
""
],
[
"Pavlov",
"Yu. V.",
""
]
] | Scattering of particles in the gravitational field of rotating black holes is considered. Expressions for scattering energy of particles in the centre of mass system are obtained. It is shown that scattering energy of particles in the centre of mass system can obtain very large values not only for extremal black holes ... |
2402.01819 | Jethro Linley | Jethro Linley | Fast LISA likelihood approximations by downsampling | 27 pages, 4 figures | null | null | null | gr-qc astro-ph.HE astro-ph.IM | http://creativecommons.org/licenses/by/4.0/ | The LISA gravitational wave observatory is due to launch in 2035. Researchers
are currently working out the data analysis picture, including determining
requirements of, and prospects for, parameterised gravitational wave models
used in Bayesian inference, of which early stage inspirals of low and
intermediate mass b... | [
{
"created": "Fri, 2 Feb 2024 16:17:06 GMT",
"version": "v1"
}
] | 2024-02-06 | [
[
"Linley",
"Jethro",
""
]
] | The LISA gravitational wave observatory is due to launch in 2035. Researchers are currently working out the data analysis picture, including determining requirements of, and prospects for, parameterised gravitational wave models used in Bayesian inference, of which early stage inspirals of low and intermediate mass bla... |
1301.4198 | Tosaporn Angsachon | T. Angsachon, S. N. Manida | Schwarzschild Solution in R-spacetime | 6 pages | Bulletin of St.Petersburg University, Physics and Chemistry
Section, (2) p.14, 2013 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Here we construct new solution for the Einstein equations -- some analog of
the Schwarzschild metric in anti--de Sitter--Beltrami space in the $c\to
\infty$ limit ($R$-space). In this case we derive an adiabatic invariant for
finite movement of the massive point particle and separate variables
Hamilton--Jacobi equati... | [
{
"created": "Thu, 17 Jan 2013 19:41:21 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Jan 2019 09:06:27 GMT",
"version": "v2"
}
] | 2019-01-10 | [
[
"Angsachon",
"T.",
""
],
[
"Manida",
"S. N.",
""
]
] | Here we construct new solution for the Einstein equations -- some analog of the Schwarzschild metric in anti--de Sitter--Beltrami space in the $c\to \infty$ limit ($R$-space). In this case we derive an adiabatic invariant for finite movement of the massive point particle and separate variables Hamilton--Jacobi equation... |
gr-qc/0607128 | Benedikt Zeller | Benedikt Zeller, Ralf Hiptmair | Conservative discretization of the Einstein-Dirac equations in
spherically symmetric spacetime | 24 pages, 8 figures | Class.Quant.Grav. 23 (2006) S615 | 10.1088/0264-9381/23/16/S17 | ETH Zurich, SAM Report 2006-06 | gr-qc | null | In computational relativity, critical behaviour near the black hole threshold
has been studied numerically for several models in the last decade. In this
paper we present a spatial Galerkin method, suitable for finding numerical
solutions of the Einstein-Dirac equations in spherically symmetric spacetime
(in polar/ar... | [
{
"created": "Fri, 28 Jul 2006 02:53:36 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Zeller",
"Benedikt",
""
],
[
"Hiptmair",
"Ralf",
""
]
] | In computational relativity, critical behaviour near the black hole threshold has been studied numerically for several models in the last decade. In this paper we present a spatial Galerkin method, suitable for finding numerical solutions of the Einstein-Dirac equations in spherically symmetric spacetime (in polar/area... |
gr-qc/0606009 | Christopher J. Fewster | Christopher J. Fewster and Lutz W. Osterbrink | Averaged Energy Inequalities for the Non-Minimally Coupled Classical
Scalar Field | 8 pages, RevTeX4. Minor typos corrected; version to appear in Phys
Rev D | Phys.Rev.D74:044021,2006 | 10.1103/PhysRevD.74.044021 | null | gr-qc | null | The stress energy tensor for the classical non-minimally coupled scalar field
is known not to satisfy the point-wise energy conditions of general relativity.
In this paper we show, however, that local averages of the classical stress
energy tensor satisfy certain inequalities. We give bounds for averages along
causal... | [
{
"created": "Fri, 2 Jun 2006 16:11:45 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Aug 2006 13:04:12 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Fewster",
"Christopher J.",
""
],
[
"Osterbrink",
"Lutz W.",
""
]
] | The stress energy tensor for the classical non-minimally coupled scalar field is known not to satisfy the point-wise energy conditions of general relativity. In this paper we show, however, that local averages of the classical stress energy tensor satisfy certain inequalities. We give bounds for averages along causal g... |
1704.06734 | Hernando Quevedo | Francisco Frutos-Alfaro, Hernando Quevedo and Pedro S\'anchez | Comparison of Vacuum Static Quadrupolar Metrics | null | null | 10.1098/rsos.170826 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the properties of static and axisymmetric vacuum solutions of
Einstein equations which generalize the Schwarzschild spherically symmetric
solution to include a quadrupole parameter. We test all the solutions with
respect to elementary and asymptotic flatness and curvature regularity.
Analyzing their mu... | [
{
"created": "Sat, 22 Apr 2017 01:55:28 GMT",
"version": "v1"
}
] | 2024-08-05 | [
[
"Frutos-Alfaro",
"Francisco",
""
],
[
"Quevedo",
"Hernando",
""
],
[
"Sánchez",
"Pedro",
""
]
] | We investigate the properties of static and axisymmetric vacuum solutions of Einstein equations which generalize the Schwarzschild spherically symmetric solution to include a quadrupole parameter. We test all the solutions with respect to elementary and asymptotic flatness and curvature regularity. Analyzing their mult... |
1507.01913 | James Dilts | James Dilts | The Einstein Constraint Equations on Asymptotically Euclidean Manifolds | 79 pages, 2 tables, James Dilts's Ph.D. dissertation at University of
Oregon | null | null | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this dissertation, we prove a number of results regarding the conformal
method of finding solutions to the Einstein constraint equations. These results
include necessary and sufficient conditions for the Lichnerowicz equation to
have solutions, global supersolutions which guarantee solutions to the
conformal const... | [
{
"created": "Tue, 7 Jul 2015 18:34:07 GMT",
"version": "v1"
}
] | 2015-07-08 | [
[
"Dilts",
"James",
""
]
] | In this dissertation, we prove a number of results regarding the conformal method of finding solutions to the Einstein constraint equations. These results include necessary and sufficient conditions for the Lichnerowicz equation to have solutions, global supersolutions which guarantee solutions to the conformal constra... |
2112.06269 | Vasilis Oikonomou | S.D. Odintsov, V.K. Oikonomou | $R^2$ Inflation Revisited and Dark Energy Corrections | PRD Accepted | null | 10.1103/PhysRevD.104.124065 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The vacuum $R^2$ model is known to generate a quasi-de Sitter evolution for
inflation, using solely the slow-roll assumptions. Using standard
reconstruction techniques, we demonstrate that the $f(R)$ gravity which
actually realizes the quasi-de Sitter evolution is not simply the $R^2$ model
but a deformed $R^2$ model... | [
{
"created": "Sun, 12 Dec 2021 16:04:51 GMT",
"version": "v1"
}
] | 2022-01-05 | [
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K.",
""
]
] | The vacuum $R^2$ model is known to generate a quasi-de Sitter evolution for inflation, using solely the slow-roll assumptions. Using standard reconstruction techniques, we demonstrate that the $f(R)$ gravity which actually realizes the quasi-de Sitter evolution is not simply the $R^2$ model but a deformed $R^2$ model w... |
1312.7501 | Bruce Dean | Bruce Herold Dean | Variational Results and Solutions in Gauge Gravity and a Bifurcation
Analysis of Black Hole Orbital Dynamics | Thesis (PhD). West Virginia University, Source DAI-B 61/03, p. 1448,
Sep 2000, 223 pages. Publication Date: 10/1999 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An analysis of all known spherically symmetric solutions to the field
equations originating from the Riemann tensor quadratic curvature Lagrangian is
presented. A new exact solution is found for the field equation originating
from the "energy-momentum" equation of the gauge gravity theory. Imposing
equivalence betwee... | [
{
"created": "Sun, 29 Dec 2013 04:58:46 GMT",
"version": "v1"
}
] | 2013-12-31 | [
[
"Dean",
"Bruce Herold",
""
]
] | An analysis of all known spherically symmetric solutions to the field equations originating from the Riemann tensor quadratic curvature Lagrangian is presented. A new exact solution is found for the field equation originating from the "energy-momentum" equation of the gauge gravity theory. Imposing equivalence between ... |
2305.11247 | Shahar Hadar | Shahar Hadar, Sreehari Harikesh, Doron Chelouche | Extreme lensing induces spectro-temporal correlations in black-hole
signals | null | null | 10.1103/PhysRevD.107.124057 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Rapid progress in electromagnetic black hole observation presents a
theoretical challenge: how can the universal signatures of extreme
gravitational lensing be distilled from stochastic astrophysical signals? With
this motivation, the two-point correlation function of specific intensity
fluctuations across image posi... | [
{
"created": "Thu, 18 May 2023 18:19:58 GMT",
"version": "v1"
}
] | 2023-07-12 | [
[
"Hadar",
"Shahar",
""
],
[
"Harikesh",
"Sreehari",
""
],
[
"Chelouche",
"Doron",
""
]
] | Rapid progress in electromagnetic black hole observation presents a theoretical challenge: how can the universal signatures of extreme gravitational lensing be distilled from stochastic astrophysical signals? With this motivation, the two-point correlation function of specific intensity fluctuations across image positi... |
1305.5741 | Papantonopoulos Eleftherios | George Koutsoumbas, Konstantinos Ntrekis and Eleftherios
Papantonopoulos | Gravitational Particle Production in Gravity Theories with Non-minimal
Derivative Couplings | 23 pages, 12 figures, version to be published in JCAP | null | 10.1088/1475-7516/2013/08/027 | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-sa/3.0/ | We study the gravitational production of heavy X-particles of mass of the
order of the inflaton mass, produced after the end of inflation. We find that,
in the presence of a derivative coupling of the inflaton field or of the
X-field to the Einstein tensor, the number of gravitationally produced
particles is suppress... | [
{
"created": "Fri, 24 May 2013 14:05:55 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Jul 2013 16:55:16 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Koutsoumbas",
"George",
""
],
[
"Ntrekis",
"Konstantinos",
""
],
[
"Papantonopoulos",
"Eleftherios",
""
]
] | We study the gravitational production of heavy X-particles of mass of the order of the inflaton mass, produced after the end of inflation. We find that, in the presence of a derivative coupling of the inflaton field or of the X-field to the Einstein tensor, the number of gravitationally produced particles is suppressed... |
gr-qc/9902032 | null | Hwei-jang Yo and James M. Nester | Hamiltonian analysis of Poincar\'e gauge theory scalar modes | 28 pages, LaTex, submitted to International Journal of Modern Physics
D | Int.J.Mod.Phys. D8 (1999) 459-479 | 10.1142/S021827189900033X | null | gr-qc | null | The Hamiltonian constraint formalism is used to obtain the first explicit
complete analysis of non-trivial viable dynamic modes for the Poincar\'e gauge
theory of gravity. Two modes with propagating spin-zero torsion are analyzed.
The explicit form of the Hamiltonian is presented. All constraints are obtained
and cla... | [
{
"created": "Thu, 11 Feb 1999 11:59:10 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Yo",
"Hwei-jang",
""
],
[
"Nester",
"James M.",
""
]
] | The Hamiltonian constraint formalism is used to obtain the first explicit complete analysis of non-trivial viable dynamic modes for the Poincar\'e gauge theory of gravity. Two modes with propagating spin-zero torsion are analyzed. The explicit form of the Hamiltonian is presented. All constraints are obtained and class... |
1702.03823 | Takashi Hamazaki | Takashi Hamazaki | Construction and applications of the manifestly gauge invariant
expressions of the solutions of the cosmological perturbation theory | null | Annals of Physics 394(2018)179-224 | 10.1016/j.aop.2018.05.007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After giving how to construct the gauge invariant perturbation variable in an
arbitrarily high order and in the arbitrary background spacetime, we consider
the manifestly gauge invariant theory of the cosmological perturbations in the
long wavelength limit with the spatially flat homogeneous isotropic universe
being ... | [
{
"created": "Fri, 10 Feb 2017 03:12:58 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Jun 2017 00:15:12 GMT",
"version": "v2"
},
{
"created": "Thu, 31 May 2018 03:30:53 GMT",
"version": "v3"
}
] | 2018-06-01 | [
[
"Hamazaki",
"Takashi",
""
]
] | After giving how to construct the gauge invariant perturbation variable in an arbitrarily high order and in the arbitrary background spacetime, we consider the manifestly gauge invariant theory of the cosmological perturbations in the long wavelength limit with the spatially flat homogeneous isotropic universe being th... |
1406.1470 | Philip D. Mannheim | Philip D. Mannheim and J. J. Poveromo | Gravitational Analog of Faraday's Law via Torsion and a Metric with an
Antisymmetric Part | Revtex4, 4 pages. Final version, to appear in General Relativity and
Gravitation | null | 10.1007/s10714-014-1795-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we show that in the presence of torsion and a metric with an
antisymmetric part one can construct a gravitational analog of Faraday's law of
electromagnetism.
| [
{
"created": "Thu, 5 Jun 2014 18:41:37 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Aug 2014 14:21:29 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Mannheim",
"Philip D.",
""
],
[
"Poveromo",
"J. J.",
""
]
] | In this paper we show that in the presence of torsion and a metric with an antisymmetric part one can construct a gravitational analog of Faraday's law of electromagnetism. |
0903.4943 | Malcolm Anderson | Malcolm Anderson | Gravitational waveforms from the evaporating ACO cosmic string loop | 30 pages, 16 figures | Class.Quant.Grav.26:075018,2009 | 10.1088/0264-9381/26/7/075018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The linearly polarized gravitational waveforms from a certain type of
rotating, evaporating cosmic string - the Allen-Casper-Ottewill loop - are
constructed and plotted over the lifetime of the loop. The formulas for the
waveforms are simple and exact, and describe waves which attenuate
self-similarly, with the ampli... | [
{
"created": "Sat, 28 Mar 2009 07:28:44 GMT",
"version": "v1"
}
] | 2009-05-20 | [
[
"Anderson",
"Malcolm",
""
]
] | The linearly polarized gravitational waveforms from a certain type of rotating, evaporating cosmic string - the Allen-Casper-Ottewill loop - are constructed and plotted over the lifetime of the loop. The formulas for the waveforms are simple and exact, and describe waves which attenuate self-similarly, with the amplitu... |
2202.12960 | Borzoo Nazari | Borzoo Nazari | Quantum vacuum under mixed boundary conditions: the case for curved
spacetime | null | Class. Quantum Grav. 37 135014 (2020) | 10.1088/1361-6382/ab8bb7 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Influence of gravity on the quantum vacuum of a massless minimally coupled
scalar field under Robin boundary conditions on parallel plates is
investigated. We introduce the detailed calculation of the volume energy for
the case the gravitational background is weak in its most general form for a
static spacetime. It f... | [
{
"created": "Fri, 25 Feb 2022 20:30:52 GMT",
"version": "v1"
}
] | 2022-03-01 | [
[
"Nazari",
"Borzoo",
""
]
] | Influence of gravity on the quantum vacuum of a massless minimally coupled scalar field under Robin boundary conditions on parallel plates is investigated. We introduce the detailed calculation of the volume energy for the case the gravitational background is weak in its most general form for a static spacetime. It fou... |
1505.04027 | Taeyoon Moon | Yun Soo Myung, Taeyoon Moon, and Bum-Hoon Lee | Revisiting slow-roll inflation in nonminimal derivative coupling with
potentials | 1+16 pages, 7 figures, 2 tables, version accepted for publication in
JCAP | null | 10.1088/1475-7516/2015/10/007 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the slow-roll inflation in the nonminimal derivative coupling
(NDC) model with exponential, quadric, and quartic potentials. It was known
that this model provides an enhanced slow-roll inflation induced by
gravitationally enhanced friction even for a steep exponential potential. In
the phase portrait, ... | [
{
"created": "Fri, 15 May 2015 11:09:29 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Sep 2015 02:26:23 GMT",
"version": "v2"
}
] | 2015-10-14 | [
[
"Myung",
"Yun Soo",
""
],
[
"Moon",
"Taeyoon",
""
],
[
"Lee",
"Bum-Hoon",
""
]
] | We investigate the slow-roll inflation in the nonminimal derivative coupling (NDC) model with exponential, quadric, and quartic potentials. It was known that this model provides an enhanced slow-roll inflation induced by gravitationally enhanced friction even for a steep exponential potential. In the phase portrait, th... |
gr-qc/9609065 | Cai Rong-gen | Rong-Gen Cai and Yuan-Zhong Zhang (ACITP, Beijing) | Black plane solutions in four dimensional spacetimes | 8 pages, RevTex, to appear in Phys. Rev. D | Phys.Rev.D54:4891-4898,1996 | 10.1103/PhysRevD.54.4891 | null | gr-qc | null | The static, plane symmetric solutions and cylindrically symmetric solutions
of Einstein-Maxwell equations with a negative cosmological constant are
investigated. These black configurations are asymptotically anti-de Sitter not
only in the transverse directions, but also in the membrane or string
directions. Their cau... | [
{
"created": "Sat, 28 Sep 1996 08:14:58 GMT",
"version": "v1"
}
] | 2009-07-09 | [
[
"Cai",
"Rong-Gen",
"",
"ACITP, Beijing"
],
[
"Zhang",
"Yuan-Zhong",
"",
"ACITP, Beijing"
]
] | The static, plane symmetric solutions and cylindrically symmetric solutions of Einstein-Maxwell equations with a negative cosmological constant are investigated. These black configurations are asymptotically anti-de Sitter not only in the transverse directions, but also in the membrane or string directions. Their causa... |
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