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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0907.0412 | Robert M. Wald | Robert M. Wald | Introduction to Gravitational Self-Force | 11 pages, no figures, to appear in proceedings of CNRS School on Mass | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The motion of sufficiently small body in general relativity should be
accurately described by a geodesic. However, there should be ``gravitational
self-force'' corrections to geodesic motion, analogous to the ``radiation
reaction forces'' that occur in electrodynamics. It is of considerable
importance to be able to c... | [
{
"created": "Thu, 2 Jul 2009 15:42:20 GMT",
"version": "v1"
}
] | 2009-07-03 | [
[
"Wald",
"Robert M.",
""
]
] | The motion of sufficiently small body in general relativity should be accurately described by a geodesic. However, there should be ``gravitational self-force'' corrections to geodesic motion, analogous to the ``radiation reaction forces'' that occur in electrodynamics. It is of considerable importance to be able to cal... |
1101.1632 | A Khodam-Mohammadi | A. Khodam-Mohammadi, M. Malekjani | Interacting entropy-corrected holographic dark energy with apparent
horizon as an infrared cutoff | 20 pages, 8 figures, figures changed, some Ref. is added, changed
some sentences, accepted by General relativity and gravitation (GERG) | Gen Relativ Gravit (2012) 44:1163-1179 | 10.1007/s10714-012-1332-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we consider the entropy-corrected version of interacting
holographic dark energy (HDE), in the non-flat universe enclosed by apparent
horizon. Two corrections of entropy so-called logarithmic 'LEC' and power-law
'PLEC' in HDE model with apparent horizon as an IR-cutoff are studied. The
ratio of dark matt... | [
{
"created": "Sun, 9 Jan 2011 13:25:09 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Feb 2012 07:26:39 GMT",
"version": "v2"
}
] | 2012-04-10 | [
[
"Khodam-Mohammadi",
"A.",
""
],
[
"Malekjani",
"M.",
""
]
] | In this work we consider the entropy-corrected version of interacting holographic dark energy (HDE), in the non-flat universe enclosed by apparent horizon. Two corrections of entropy so-called logarithmic 'LEC' and power-law 'PLEC' in HDE model with apparent horizon as an IR-cutoff are studied. The ratio of dark matter... |
2110.13990 | Qasem Exirifard | Qasem Exirifard, Ebrahim Karimi | Gravitational distortion on photon state at the vicinity of the Earth | Matches the published version | Phys. Rev. D 105, 084016, 2022 | 10.1103/PhysRevD.105.084016 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As a photon propagates along a null geodesic, the space-time curvature around
the geodesic distorts its wave function. We utilise the Fermi coordinates
adapted to a general null geodesic, and derive the equation for interaction
between the Riemann tensor and the photon wave function. The equation is solved
by being m... | [
{
"created": "Tue, 26 Oct 2021 19:49:21 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Mar 2022 23:40:14 GMT",
"version": "v2"
}
] | 2022-04-12 | [
[
"Exirifard",
"Qasem",
""
],
[
"Karimi",
"Ebrahim",
""
]
] | As a photon propagates along a null geodesic, the space-time curvature around the geodesic distorts its wave function. We utilise the Fermi coordinates adapted to a general null geodesic, and derive the equation for interaction between the Riemann tensor and the photon wave function. The equation is solved by being map... |
gr-qc/0304001 | Jose Socorro Garcia Diaz | J. Socorro | Classical solutions from quantum regime for barotropic FRW model | 9 pages, minor changes, accepted in Int. J. of Theor. Phys | Int.J.Theor.Phys. 42 (2003) 2087-2096 | null | null | gr-qc | null | The quantization of gravity coupled to barotropic perfect fluid as matter
field and cosmological constant is made and the wave function can be determined
for any $\kappa$ in the FRW minisuperspace model. The meaning of the existence
of the classical solution is discussed in the WKB semiclassical approximation
| [
{
"created": "Mon, 31 Mar 2003 21:21:26 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Jul 2003 14:46:10 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Socorro",
"J.",
""
]
] | The quantization of gravity coupled to barotropic perfect fluid as matter field and cosmological constant is made and the wave function can be determined for any $\kappa$ in the FRW minisuperspace model. The meaning of the existence of the classical solution is discussed in the WKB semiclassical approximation |
1903.05118 | Rafael A. Porto | Stefano Foffa, Rafael A. Porto, Ira Rothstein and Riccardo Sturani | Conservative dynamics of binary systems to fourth Post-Newtonian order
in the EFT approach II: Renormalized Lagrangian | 40 pages. 8 figures. v2: Published version | Phys. Rev. D 100, 024048 (2019) | 10.1103/PhysRevD.100.024048 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We complete the derivation of the conservative dynamics of binary systems to
fourth Post-Newtonian (4PN) order in the effective field theory (EFT) approach.
We present a self-contained (ambiguity-free) computation of the renormalized
Lagrangian, entirely within the confines of the PN expansion. While we confirm
the f... | [
{
"created": "Tue, 12 Mar 2019 18:05:43 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jul 2019 08:14:00 GMT",
"version": "v2"
}
] | 2019-07-31 | [
[
"Foffa",
"Stefano",
""
],
[
"Porto",
"Rafael A.",
""
],
[
"Rothstein",
"Ira",
""
],
[
"Sturani",
"Riccardo",
""
]
] | We complete the derivation of the conservative dynamics of binary systems to fourth Post-Newtonian (4PN) order in the effective field theory (EFT) approach. We present a self-contained (ambiguity-free) computation of the renormalized Lagrangian, entirely within the confines of the PN expansion. While we confirm the fin... |
1210.8444 | Alexandre Le Tiec | Samuel E. Gralla, Alexandre Le Tiec | Thermodynamics of a Black Hole with Moon | 8 pages, 4 figures; matches the published version | Phys.Rev.D88:044021,2013 | 10.1103/PhysRevD.88.044021 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For a Kerr black hole perturbed by a particle on the "corotating" circular
orbit (angular velocity equal to that of the unperturbed event horizon), the
black hole remains in equilibrium in the sense that the perturbed event horizon
is a Killing horizon of the helical Killing field. The associated surface
gravity is c... | [
{
"created": "Wed, 31 Oct 2012 19:22:56 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Jun 2013 20:09:30 GMT",
"version": "v2"
},
{
"created": "Fri, 23 Aug 2013 15:21:33 GMT",
"version": "v3"
}
] | 2013-08-26 | [
[
"Gralla",
"Samuel E.",
""
],
[
"Tiec",
"Alexandre Le",
""
]
] | For a Kerr black hole perturbed by a particle on the "corotating" circular orbit (angular velocity equal to that of the unperturbed event horizon), the black hole remains in equilibrium in the sense that the perturbed event horizon is a Killing horizon of the helical Killing field. The associated surface gravity is con... |
0808.3308 | Muhammad Akbar | M. Akbar | Generalized Second Law of Thermodynamics in Extended Theories of Gravity | 10 pages | Int.J.Theor.Phys.48:2665-2671,2009 | 10.1007/s10773-009-0056-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By employing the general expression of temperature $T_{h}=|\kappa|/2\pi =
\frac{1}{2\pi \tilde{r}_{A}}(1-\frac{\dot{\tilde{r}}_{A}}{2H\tilde{r}_{A}})$
associated with the apparent horizon of a FRW universe and assuming a region of
FRW universe enclosed by the apparent horizon as a thermal system in
equilibrium, we ar... | [
{
"created": "Mon, 25 Aug 2008 07:10:38 GMT",
"version": "v1"
}
] | 2009-09-28 | [
[
"Akbar",
"M.",
""
]
] | By employing the general expression of temperature $T_{h}=|\kappa|/2\pi = \frac{1}{2\pi \tilde{r}_{A}}(1-\frac{\dot{\tilde{r}}_{A}}{2H\tilde{r}_{A}})$ associated with the apparent horizon of a FRW universe and assuming a region of FRW universe enclosed by the apparent horizon as a thermal system in equilibrium, we are ... |
1711.10888 | Puxun Wu | Chengjie Fu, Puxun Wu and Hongwei Yu | Production of gravitational waves during preheating with nonminimal
coupling | 14 pages, 3 figures | Phys. Rev. D 97, 081303 (2018) | 10.1103/PhysRevD.97.081303 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the preheating and the in-process production of gravitational waves
(GWs) after inflation in which the inflaton is nonminimally coupled to the
curvature in a self-interacting quartic potential with the method of lattice
simulation. We find that the nonminimal coupling enhances the amplitude of the
density sp... | [
{
"created": "Wed, 29 Nov 2017 14:51:05 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Nov 2017 15:10:58 GMT",
"version": "v2"
},
{
"created": "Mon, 30 Apr 2018 03:21:12 GMT",
"version": "v3"
}
] | 2018-05-02 | [
[
"Fu",
"Chengjie",
""
],
[
"Wu",
"Puxun",
""
],
[
"Yu",
"Hongwei",
""
]
] | We study the preheating and the in-process production of gravitational waves (GWs) after inflation in which the inflaton is nonminimally coupled to the curvature in a self-interacting quartic potential with the method of lattice simulation. We find that the nonminimal coupling enhances the amplitude of the density spec... |
2007.14429 | Ulrich Sperhake | Roxana Rosca-Mead, Christopher J. Moore, Ulrich Sperhake, Michalis
Agathos, Davide Gerosa | Structure of neutron stars in massive scalar-tensor gravity | Corrected Eq.(6) | Symmetry 12 (2020) 1384 | 10.3390/sym12091384 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute families of spherically symmetric neutron-star models in
two-derivative scalar-tensor theories of gravity with a massive scalar field.
The numerical approach we present allows us to compute the resulting spacetimes
out to infinite radius using a relaxation algorithm on a compactified grid. We
discuss the s... | [
{
"created": "Tue, 28 Jul 2020 18:28:34 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Aug 2020 18:50:46 GMT",
"version": "v2"
},
{
"created": "Mon, 31 Aug 2020 15:42:14 GMT",
"version": "v3"
}
] | 2021-05-21 | [
[
"Rosca-Mead",
"Roxana",
""
],
[
"Moore",
"Christopher J.",
""
],
[
"Sperhake",
"Ulrich",
""
],
[
"Agathos",
"Michalis",
""
],
[
"Gerosa",
"Davide",
""
]
] | We compute families of spherically symmetric neutron-star models in two-derivative scalar-tensor theories of gravity with a massive scalar field. The numerical approach we present allows us to compute the resulting spacetimes out to infinite radius using a relaxation algorithm on a compactified grid. We discuss the str... |
1801.03027 | Marios Christodoulou | Marios Christodoulou and Fabio D'Ambrosio | Characteristic Time Scales for the Geometry Transition of a Black Hole
to a White Hole from Spinfoams | 10 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum fluctuations of the metric provide a decay mechanism for black holes,
through a transition to a white hole geometry. Old perplexing results by Ambrus
and H\'aj\'i\v{c}ek and more recent results by Barcel\'o, Carballo-Rubio and
Garay, indicate a characteristic time scale of this process that scales
linearly wi... | [
{
"created": "Tue, 9 Jan 2018 16:25:17 GMT",
"version": "v1"
},
{
"created": "Sun, 4 Mar 2018 04:23:01 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Apr 2024 05:09:45 GMT",
"version": "v3"
}
] | 2024-04-26 | [
[
"Christodoulou",
"Marios",
""
],
[
"D'Ambrosio",
"Fabio",
""
]
] | Quantum fluctuations of the metric provide a decay mechanism for black holes, through a transition to a white hole geometry. Old perplexing results by Ambrus and H\'aj\'i\v{c}ek and more recent results by Barcel\'o, Carballo-Rubio and Garay, indicate a characteristic time scale of this process that scales linearly with... |
1904.09944 | Yisong Yang Professor | Shouxin Chen, Yisong Yang | Dilaton Mass Formulas in a Hairy Binary Black Hole Model | 16 pages, 5 figures, to appear | Modern Physics Letters A 35 (2020) 2050277 | 10.1142/S0217732320502776 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this note an analytic integration is obtained for the differential
equation governing the scalar-field-dependent mass in a hairy binary black hole
model, in the context of the Einstein--Maxwell--dilation theory, which gives a
closed-form formula-level description of the mass function. We also identify a
particular... | [
{
"created": "Mon, 22 Apr 2019 16:43:06 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Oct 2020 16:08:03 GMT",
"version": "v2"
}
] | 2022-06-27 | [
[
"Chen",
"Shouxin",
""
],
[
"Yang",
"Yisong",
""
]
] | In this note an analytic integration is obtained for the differential equation governing the scalar-field-dependent mass in a hairy binary black hole model, in the context of the Einstein--Maxwell--dilation theory, which gives a closed-form formula-level description of the mass function. We also identify a particular s... |
gr-qc/0412100 | Edward Malec | Janusz Karkowski and Edward Malec | The general Penrose inequality: lessons from numerical evidence | Two formulae are corrected at the end of Sec. 6 | Acta Phys.Polon. B36 (2005) 59-74 | null | null | gr-qc | null | Formulation of the Penrose inequality becomes ambiguous when the past and
future apparent horizons do cross. We test numerically several natural
possibilities of stating the inequality in punctured and boosted single- and
double- black holes, in a Dain-Friedrich class of initial data and in
conformally flat spheroida... | [
{
"created": "Tue, 21 Dec 2004 12:16:37 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Dec 2004 08:34:45 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Karkowski",
"Janusz",
""
],
[
"Malec",
"Edward",
""
]
] | Formulation of the Penrose inequality becomes ambiguous when the past and future apparent horizons do cross. We test numerically several natural possibilities of stating the inequality in punctured and boosted single- and double- black holes, in a Dain-Friedrich class of initial data and in conformally flat spheroidal ... |
2109.03280 | Alessio Belenchia | Felix Spengler, Alessio Belenchia, Dennis R\"atzel, Daniel Braun | Influence of cosmological expansion in local experiments | 20+11 pages, 1 figure, version close to the one published | Class. Quantum Grav. 39 055005 (2022) | 10.1088/1361-6382/ac4954 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Whether the cosmological expansion can influence the local dynamics, below
the galaxy clusters scale, has been the subject of intense investigations in
the past three decades. In this work, we consider McVittie and Kottler
spacetimes, embedding a spherical object in a FLRW spacetime. We calculate the
influence of the... | [
{
"created": "Tue, 7 Sep 2021 18:31:26 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Feb 2022 10:13:00 GMT",
"version": "v2"
}
] | 2022-02-11 | [
[
"Spengler",
"Felix",
""
],
[
"Belenchia",
"Alessio",
""
],
[
"Rätzel",
"Dennis",
""
],
[
"Braun",
"Daniel",
""
]
] | Whether the cosmological expansion can influence the local dynamics, below the galaxy clusters scale, has been the subject of intense investigations in the past three decades. In this work, we consider McVittie and Kottler spacetimes, embedding a spherical object in a FLRW spacetime. We calculate the influence of the c... |
gr-qc/9405016 | null | Shawn J. Kolitch and Douglas M. Eardley | Behavior of Friedmann-Robertson-Walker Cosmological Models in
Scalar-Tensor Gravity | Slight stylistic changes and some references added. This version to
be published in {\sl Annals of Physics} | Ann.Phys.241:128-151,1995 | 10.1006/aphy.1995.1058 | null | gr-qc | null | We analyze solutions to Friedmann-Robertson-Walker cosmologies in Brans-Dicke
theory, where a scalar field is coupled to gravity. Matter is modelled by a
$\gamma$-law perfect fluid, including false-vacuum energy as a special case.
Through a change of variables, we reduce the field equations from fourth order
to secon... | [
{
"created": "Sat, 7 May 1994 06:12:39 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Feb 1995 16:19:25 GMT",
"version": "v2"
}
] | 2011-07-19 | [
[
"Kolitch",
"Shawn J.",
""
],
[
"Eardley",
"Douglas M.",
""
]
] | We analyze solutions to Friedmann-Robertson-Walker cosmologies in Brans-Dicke theory, where a scalar field is coupled to gravity. Matter is modelled by a $\gamma$-law perfect fluid, including false-vacuum energy as a special case. Through a change of variables, we reduce the field equations from fourth order to second ... |
1310.6101 | Shahar Hod | Shahar Hod | Analytic treatment of the charged black-hole-mirror bomb in the highly
explosive regime | 6 pages | Physical Review D 88, 064055 (2013) | 10.1103/PhysRevD.88.064055 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A charged scalar field impinging upon a charged Reissner-Nordstrom black hole
can be amplified as it scatters off the hole, a phenomenon known as
superradiant scattering. This scattering process in the superradiant regime
w<qQ/r_+ (here w, q, Q, and r_{+-} are the conserved frequency of the wave, the
charge coupling ... | [
{
"created": "Wed, 23 Oct 2013 03:22:34 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Hod",
"Shahar",
""
]
] | A charged scalar field impinging upon a charged Reissner-Nordstrom black hole can be amplified as it scatters off the hole, a phenomenon known as superradiant scattering. This scattering process in the superradiant regime w<qQ/r_+ (here w, q, Q, and r_{+-} are the conserved frequency of the wave, the charge coupling co... |
gr-qc/9707047 | Winfried Zimdahl | Winfried Zimdahl | Cosmological perturbation theory and conserved quantities in the
large-scale limit | 12 pages, Revtex, to appear in Class.Quantum Grav | Class.Quant.Grav.14:2563-2576,1997 | 10.1088/0264-9381/14/9/012 | null | gr-qc astro-ph | null | The linear cosmological perturbation theory of an almost homogeneous and
isotropic perfect fluid universe is reconsidered and formally simplified by
introducing new covariant and gauge-invariant variables with physical
interpretations on hypersurfaces of constant expansion, constant curvature or
constant energy densi... | [
{
"created": "Tue, 22 Jul 1997 10:19:38 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Zimdahl",
"Winfried",
""
]
] | The linear cosmological perturbation theory of an almost homogeneous and isotropic perfect fluid universe is reconsidered and formally simplified by introducing new covariant and gauge-invariant variables with physical interpretations on hypersurfaces of constant expansion, constant curvature or constant energy density... |
gr-qc/0601027 | Earnest Harrison | Earnest Harrison | An Explicit Isochronal, Isometric Embedding | 5 pages, 2 figures | null | null | null | gr-qc | null | Certain semi-Riemannian metrics may be decomposed into a Riemannian part and
an isochronal part. We use this idea and an idea of Kasner to construct a
manifold in 6+1 Minkowski space with a well known metric. The full embedding we
display is isochronal which simplifies visualizing the properties of the
manifold.
| [
{
"created": "Sat, 7 Jan 2006 13:54:34 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Harrison",
"Earnest",
""
]
] | Certain semi-Riemannian metrics may be decomposed into a Riemannian part and an isochronal part. We use this idea and an idea of Kasner to construct a manifold in 6+1 Minkowski space with a well known metric. The full embedding we display is isochronal which simplifies visualizing the properties of the manifold. |
2301.12136 | Vasilis Oikonomou | V.K. Oikonomou | $R^p$ Attractors Static Neutron Star Phenomenology | MNRAS Accepted | null | 10.1093/mnras/stad326 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study the neutron star phenomenology of $R^p$ attractor
theories in the Einstein frame. The Einstein frame $R^p$ attractor theories
have the attractor property that they originate from a large class of Jordan
frame scalar theories with arbitrary non-minimal coupling. These theories in
the Einstein fra... | [
{
"created": "Sat, 28 Jan 2023 09:07:40 GMT",
"version": "v1"
}
] | 2023-02-08 | [
[
"Oikonomou",
"V. K.",
""
]
] | In this work we study the neutron star phenomenology of $R^p$ attractor theories in the Einstein frame. The Einstein frame $R^p$ attractor theories have the attractor property that they originate from a large class of Jordan frame scalar theories with arbitrary non-minimal coupling. These theories in the Einstein frame... |
gr-qc/9912114 | Sang Pyo Kim | Sang Pyo Kim | Entropy Production and Thermodynamic Arrow of Time in a Recollapsing
Universe | RevTex 10 pages, Proceedings of the 6th Italian-Korean Meeting on
Relativistic Astrophysics, Pescara, Italy, 1999 | Nuovo Cim.B115:1039-1048,2000 | null | null | gr-qc | null | We investigate the thermodynamic arrow of time in a time-symmetrically
recollapsing universe by calculating quantum mechanically the entropy
production of a massive scalar field. It is found that even though the
Hamiltonian has a time-reversal symmetry with respect to the maximum expansion
of the universe, the entrop... | [
{
"created": "Wed, 29 Dec 1999 06:16:27 GMT",
"version": "v1"
}
] | 2011-04-15 | [
[
"Kim",
"Sang Pyo",
""
]
] | We investigate the thermodynamic arrow of time in a time-symmetrically recollapsing universe by calculating quantum mechanically the entropy production of a massive scalar field. It is found that even though the Hamiltonian has a time-reversal symmetry with respect to the maximum expansion of the universe, the entropy ... |
1304.7271 | Giovanni Amelino-Camelia | Giovanni Amelino-Camelia | Challenge to Macroscopic Probes of Quantum Spacetime Based on
Noncommutative Geometry | latex, 6 pages | Physical Review Letters 111, 101301 (2013) | 10.1103/PhysRevLett.111.101301 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Over the last decade a growing number of quantum-gravity researchers has been
looking for opportunities for the first ever experimental evidence of a
Planck-length quantum property of spacetime. These studies are usually based on
the analysis of some candidate indirect implications of spacetime quantization,
such as ... | [
{
"created": "Fri, 26 Apr 2013 20:00:46 GMT",
"version": "v1"
},
{
"created": "Sun, 22 Sep 2013 16:50:11 GMT",
"version": "v2"
}
] | 2013-09-24 | [
[
"Amelino-Camelia",
"Giovanni",
""
]
] | Over the last decade a growing number of quantum-gravity researchers has been looking for opportunities for the first ever experimental evidence of a Planck-length quantum property of spacetime. These studies are usually based on the analysis of some candidate indirect implications of spacetime quantization, such as a ... |
2008.07260 | Diego S\'aez-Chill\'on G\'omez | Merce Guerrero, Diego Rubiera-Garcia, Diego Saez-Chillon Gomez | Constant roll inflation in multifield models | 13 pages, 4 figures | Phys. Rev. D 102, 123528 (2020) | 10.1103/PhysRevD.102.123528 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Constant roll inflation is analyzed in the presence of multi scalar fields
which are assumed to be described by a constant roll rate each. The different
cases are studied and the corresponding potentials are reconstructed. The exact
solutions are obtained, which show a similar behaviour to the single scalar
field mod... | [
{
"created": "Mon, 17 Aug 2020 12:46:42 GMT",
"version": "v1"
}
] | 2021-01-04 | [
[
"Guerrero",
"Merce",
""
],
[
"Rubiera-Garcia",
"Diego",
""
],
[
"Gomez",
"Diego Saez-Chillon",
""
]
] | Constant roll inflation is analyzed in the presence of multi scalar fields which are assumed to be described by a constant roll rate each. The different cases are studied and the corresponding potentials are reconstructed. The exact solutions are obtained, which show a similar behaviour to the single scalar field model... |
2309.06208 | Sarbari Guha Dr. | Sucheta Datta and Sarbari Guha | Memory Effect of Gravitational Wave Pulses in PP-Wave Spacetimes | 13 pages, 9 figures | Phys. Scr. 99 (2024) 075023 | 10.1088/1402-4896/ad5389 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the gravitational memory effect in pp-wave spacetimes
due to the passage of a pulse having the form of a ramp profile through this
spacetime. We have analyzed the effect of this pulse on the evolution of nearby
geodesics, and have determined analytical solutions of the geodesic equations
in th... | [
{
"created": "Tue, 12 Sep 2023 13:23:01 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Jan 2024 18:08:29 GMT",
"version": "v2"
},
{
"created": "Wed, 10 Jan 2024 17:43:04 GMT",
"version": "v3"
},
{
"created": "Thu, 13 Jun 2024 15:50:36 GMT",
"version": "v4"
}
] | 2024-06-17 | [
[
"Datta",
"Sucheta",
""
],
[
"Guha",
"Sarbari",
""
]
] | In this paper, we study the gravitational memory effect in pp-wave spacetimes due to the passage of a pulse having the form of a ramp profile through this spacetime. We have analyzed the effect of this pulse on the evolution of nearby geodesics, and have determined analytical solutions of the geodesic equations in the ... |
gr-qc/0410131 | Charis Anastopoulos | Charis Anastopoulos, Ntina Savvidou | Minisuperspace Models in Histories Theory | 34 pages, Latex | Class.Quant.Grav. 22 (2005) 1841-1866 | 10.1088/0264-9381/22/9/023 | null | gr-qc | null | We study the Robertson-Walker minisuperspace model in histories theory,
motivated by the results that emerged from the histories approach to general
relativity. We examine, in particular, the issue of time-reparameterisation in
such systems. The model is quantised using an adaptation of reduced-state-space
quantisati... | [
{
"created": "Wed, 27 Oct 2004 10:11:21 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Anastopoulos",
"Charis",
""
],
[
"Savvidou",
"Ntina",
""
]
] | We study the Robertson-Walker minisuperspace model in histories theory, motivated by the results that emerged from the histories approach to general relativity. We examine, in particular, the issue of time-reparameterisation in such systems. The model is quantised using an adaptation of reduced-state-space quantisation... |
gr-qc/0404124 | Kenta Kiuchi | Kenta Kiuchi, Kei-ichi Maeda | Gravitational Waves from Chaotic Dynamical System | 8 pages, 13 figures. submitted to PRD | Phys.Rev. D70 (2004) 064036 | 10.1103/PhysRevD.70.064036 | WU-AP/185/04 | gr-qc | null | To investigate how chaos affects gravitational waves, we study the
gravitational waves from a spinning test particle moving around a Kerr black
hole, which is a typical chaotic system. To compare the result with those in
non-chaotic dynamical system, we also analyze a spinless test particle, which
orbit can be compli... | [
{
"created": "Fri, 30 Apr 2004 03:32:13 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Kiuchi",
"Kenta",
""
],
[
"Maeda",
"Kei-ichi",
""
]
] | To investigate how chaos affects gravitational waves, we study the gravitational waves from a spinning test particle moving around a Kerr black hole, which is a typical chaotic system. To compare the result with those in non-chaotic dynamical system, we also analyze a spinless test particle, which orbit can be complica... |
2108.12408 | Lucas Timotheo Sanches | Lucas Timotheo Sanches and Maur\'icio Richartz | Energy Extraction From Non-Coalescing Black Hole Binaries | 14 pages, 14 figures. Accepted for publication in Phys. Rev. D. In
this version, a new section was added to demonstrate how the concepts
discussed can be extended to Kerr black hole binaries | Phys. Rev. D 104, 124025 (2021) | 10.1103/PhysRevD.104.124025 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We define and sketch the generalized ergosphere of the Majumdar-Papapetrou
(MP) spacetime. In particular, we demonstrate the existence of closed orbits of
negative energy that live outside the event horizon of such a spacetime.
Relying on the Penrose process mechanism, we use these orbits to illustrate the
possibilit... | [
{
"created": "Fri, 27 Aug 2021 17:34:18 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Nov 2021 19:17:08 GMT",
"version": "v2"
}
] | 2021-12-10 | [
[
"Sanches",
"Lucas Timotheo",
""
],
[
"Richartz",
"Maurício",
""
]
] | We define and sketch the generalized ergosphere of the Majumdar-Papapetrou (MP) spacetime. In particular, we demonstrate the existence of closed orbits of negative energy that live outside the event horizon of such a spacetime. Relying on the Penrose process mechanism, we use these orbits to illustrate the possibility ... |
gr-qc/0208022 | Jerry B. Griffiths | J.B. Griffiths, J. Podolsky and P. Docherty | An interpretation of Robinson-Trautman type N solutions | 13 pages, 3 figures. To appear in Class. Quantum Grav | Class.Quant.Grav. 19 (2002) 4649-4662 | 10.1088/0264-9381/19/18/302 | null | gr-qc | null | The Robinson-Trautman type N solutions, which describe expanding
gravitational waves, are investigated for all possible values of the
cosmological constant Lambda and the curvature parameter epsilon. The wave
surfaces are always (hemi-)spherical, with successive surfaces displaced in a
way which depends on epsilon. E... | [
{
"created": "Thu, 8 Aug 2002 12:05:54 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Griffiths",
"J. B.",
""
],
[
"Podolsky",
"J.",
""
],
[
"Docherty",
"P.",
""
]
] | The Robinson-Trautman type N solutions, which describe expanding gravitational waves, are investigated for all possible values of the cosmological constant Lambda and the curvature parameter epsilon. The wave surfaces are always (hemi-)spherical, with successive surfaces displaced in a way which depends on epsilon. Exp... |
1904.00199 | Dong-han Yeom | Pisin Chen, Daeho Ro, Dong-han Yeom | Fuzzy Euclidean wormholes in the inflationary universe | 14 pages, 8 figures | Phys.Dark Univ. 28 (2020) 100492 | 10.1016/j.dark.2020.100492 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate complex-valued Euclidean wormholes in the
Starobinsky inflation. Due to the properties of the concave inflaton potential,
the classicality condition at both ends of the wormhole can be satisfied, as
long as the initial condition of the inflaton field is such that it is located
sufficient... | [
{
"created": "Sat, 30 Mar 2019 11:04:08 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Feb 2020 07:39:29 GMT",
"version": "v2"
}
] | 2020-02-12 | [
[
"Chen",
"Pisin",
""
],
[
"Ro",
"Daeho",
""
],
[
"Yeom",
"Dong-han",
""
]
] | In this paper, we investigate complex-valued Euclidean wormholes in the Starobinsky inflation. Due to the properties of the concave inflaton potential, the classicality condition at both ends of the wormhole can be satisfied, as long as the initial condition of the inflaton field is such that it is located sufficiently... |
2206.03490 | Prabir Rudra | Prabir Rudra | Ricci-cubic holographic dark energy | 16 pages, 6 figures | Physics of the Dark Universe 42 (2023) 101307 | 10.1016/j.dark.2023.101307 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we propose the Ricci-cubic holographic dark energy model. The
model is inspired by the cubic curvature invariant formed by the contraction of
three Riemann tensors. A combination of Ricci scalar and the cubic invariant is
used to describe the infrared cutoff of the holographic dark energy. Such a
constr... | [
{
"created": "Mon, 6 Jun 2022 19:30:56 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Aug 2023 07:43:40 GMT",
"version": "v2"
}
] | 2023-08-22 | [
[
"Rudra",
"Prabir",
""
]
] | In this work, we propose the Ricci-cubic holographic dark energy model. The model is inspired by the cubic curvature invariant formed by the contraction of three Riemann tensors. A combination of Ricci scalar and the cubic invariant is used to describe the infrared cutoff of the holographic dark energy. Such a construc... |
1810.09288 | Lorenzo Iorio | Lorenzo Iorio | The post-Newtonian gravitomagnetic spin-octupole moment of an oblate
rotating body and its effects on an orbiting test particle; are they
measurable in the Solar System? | LaTex2e, 45 pages, 5 tables, 20 figures. Some minor typos fixed.
Version matching the one published in Monthly Notices of the Royal
Astronomical Society. An erratum can be found at the end of the present
replacement | Mon.Not.Roy.Astron.Soc.484:4811-4832,2019 | 10.1093/mnras/stz304 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analytically work out the orbital effects induced by the gravitomagnetic
spin-octupole moment of an extended spheroidal rotating body endowed with
angular momentum $\boldsymbol{S}$ and quadrupole mass moment $J_2$. Our
results, proportional to $S J_2 c^{-2}$, hold for an arbitrary orientation of
the body's symmetr... | [
{
"created": "Mon, 22 Oct 2018 13:49:45 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Jan 2019 16:42:44 GMT",
"version": "v2"
},
{
"created": "Thu, 24 Jan 2019 17:44:35 GMT",
"version": "v3"
},
{
"created": "Mon, 18 Feb 2019 18:36:40 GMT",
"version": "v4"
},
{
"c... | 2019-07-04 | [
[
"Iorio",
"Lorenzo",
""
]
] | We analytically work out the orbital effects induced by the gravitomagnetic spin-octupole moment of an extended spheroidal rotating body endowed with angular momentum $\boldsymbol{S}$ and quadrupole mass moment $J_2$. Our results, proportional to $S J_2 c^{-2}$, hold for an arbitrary orientation of the body's symmetry ... |
1902.02849 | Artymowski Michal | Michal Artymowski and Ido Ben-Dayan | f(R) and Brans-Dicke Theories and the Swampland | 19 pages, 3 figures, version accepted in JCAP | null | 10.1088/1475-7516/2019/05/042 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the viability of $f(R)$ and Brans-Dicke theories of gravity in
light of the recent Swampland conjectures. We show that in the case of perfect
fluid domination the swampland conjecture conditions may be easily satisfied
and therefore we focus on the constraints in the vacuum theory. We derive the
conditions... | [
{
"created": "Thu, 7 Feb 2019 21:21:19 GMT",
"version": "v1"
},
{
"created": "Thu, 23 May 2019 08:44:29 GMT",
"version": "v2"
}
] | 2019-06-05 | [
[
"Artymowski",
"Michal",
""
],
[
"Ben-Dayan",
"Ido",
""
]
] | We discuss the viability of $f(R)$ and Brans-Dicke theories of gravity in light of the recent Swampland conjectures. We show that in the case of perfect fluid domination the swampland conjecture conditions may be easily satisfied and therefore we focus on the constraints in the vacuum theory. We derive the conditions f... |
2006.01078 | Adil Belhaj | A. Belhaj, M. Benali, A. El Balali, H. El Moumni, S-E. Ennadifi | Deflection Angle and Shadow Behaviors of Quintessential Black Holes in
arbitrary Dimensions | Latex, 30 pages, 10 figures. Minor changes, typos corrected in the
text, a short discussion on plasma, and references added. Results unchanged,
incorporating referees' comments. To appear in CQG(2020) | null | 10.1088/1361-6382/abbaa9 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by M-theory/superstring inspired models, we investigate certain
behaviors of the deflection angle and the shadow geometrical shapes of higher
dimensional quintessential black holes associated with two values of the dark
energy (DE) state parameter, being \omega=-\frac{1}{3} and \omega=-\frac{2}{3}.
Concrete... | [
{
"created": "Mon, 1 Jun 2020 17:02:00 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Jun 2020 13:08:50 GMT",
"version": "v2"
},
{
"created": "Thu, 8 Oct 2020 09:43:53 GMT",
"version": "v3"
}
] | 2020-10-28 | [
[
"Belhaj",
"A.",
""
],
[
"Benali",
"M.",
""
],
[
"Balali",
"A. El",
""
],
[
"Moumni",
"H. El",
""
],
[
"Ennadifi",
"S-E.",
""
]
] | Motivated by M-theory/superstring inspired models, we investigate certain behaviors of the deflection angle and the shadow geometrical shapes of higher dimensional quintessential black holes associated with two values of the dark energy (DE) state parameter, being \omega=-\frac{1}{3} and \omega=-\frac{2}{3}. Concretely... |
gr-qc/0610119 | Eugen Radu | William Hanan and Eugen Radu | Chaotic motion in multi-black hole spacetimes and holographic screens | 8 pages, 5 figures | Mod.Phys.Lett.A22:399-406,2007 | 10.1142/S0217732307022815 | null | gr-qc hep-th | null | We investigate the geodesic motion in $D-$dimensional Majumdar-Papapetrou
multi-black hole spacetimes and find that the qualitative features of the D=4
case are shared by the higher dimensional configurations. The motion of
timelike and null particles is chaotic, the phase space being divided into
basins of attractio... | [
{
"created": "Wed, 25 Oct 2006 13:45:06 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Hanan",
"William",
""
],
[
"Radu",
"Eugen",
""
]
] | We investigate the geodesic motion in $D-$dimensional Majumdar-Papapetrou multi-black hole spacetimes and find that the qualitative features of the D=4 case are shared by the higher dimensional configurations. The motion of timelike and null particles is chaotic, the phase space being divided into basins of attraction ... |
gr-qc/0007048 | Angelo Loinger | A. Loinger (Dipartimento di Fisica, Universita' di Milano, Italy) | On the propagation speed of wavy metric tensors | 4 pages, PDF | null | null | null | gr-qc astro-ph | null | The undulating metric tensors of general relativity do not possess a special
and common velocity of propagation. Indeed, their velocity can even coincide
with the speed of thought.
| [
{
"created": "Wed, 19 Jul 2000 19:23:13 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Loinger",
"A.",
"",
"Dipartimento di Fisica, Universita' di Milano, Italy"
]
] | The undulating metric tensors of general relativity do not possess a special and common velocity of propagation. Indeed, their velocity can even coincide with the speed of thought. |
1912.05305 | Vijay Singh Dr. | Vijay Singh and Aroonkumar Beesham | LRS Bianchi I model with perfect fluid equation of state | 16 pages, 4 figures | International Journal of Modern Physics D, Vol. 28, Page 1950056
(2019) | 10.1142/S0218271819500561 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The general solution of the field equations in LRS Bianchi-I space-time with
perfect fluid equation-of-state (EoS) is presented. The models filled with
dust, vacuum energy, Zel'dovich matter and disordered radiation are studied in
detail. A unified and systematic treatment of the solutions is presented, and
some new ... | [
{
"created": "Wed, 11 Dec 2019 13:48:01 GMT",
"version": "v1"
}
] | 2019-12-12 | [
[
"Singh",
"Vijay",
""
],
[
"Beesham",
"Aroonkumar",
""
]
] | The general solution of the field equations in LRS Bianchi-I space-time with perfect fluid equation-of-state (EoS) is presented. The models filled with dust, vacuum energy, Zel'dovich matter and disordered radiation are studied in detail. A unified and systematic treatment of the solutions is presented, and some new so... |
2302.11586 | Jos\'e De Jes\'us Padua Arg\"uelles | Bianca Dittrich and Jos\'e Padua-Arg\"uelles | Twisted geometries are area-metric geometries | 10 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quantum geometry arising in Loop Quantum Gravity has been known to
semi-classically lead to generalizations of length-geometries. There have been
several attempts to interpret these so called twisted geometries and understand
their role and fate in the continuum limit of the spin foam approach to quantum
gravity.... | [
{
"created": "Wed, 22 Feb 2023 19:00:02 GMT",
"version": "v1"
}
] | 2023-02-27 | [
[
"Dittrich",
"Bianca",
""
],
[
"Padua-Argüelles",
"José",
""
]
] | The quantum geometry arising in Loop Quantum Gravity has been known to semi-classically lead to generalizations of length-geometries. There have been several attempts to interpret these so called twisted geometries and understand their role and fate in the continuum limit of the spin foam approach to quantum gravity. I... |
1908.09267 | Geraint F. Lewis Prof | Geraint F. Lewis | Is there a Cosmological Basis for E = mc^2? | 6 pages, accepted for publication in General Relativity and
Gravitation | null | 10.1007/s10714-019-2601-7 | GFL-001 | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has recently been claimed that relativity's most famous equation, E =
mc^2, has a cosmological basis, representing the gravitational binding energy
for a particle to escape from the origin to a gravitational horizon of the
universe. In this paper, I examine these claims in detail, concluding that they
result from ... | [
{
"created": "Sun, 25 Aug 2019 07:44:41 GMT",
"version": "v1"
}
] | 2019-09-25 | [
[
"Lewis",
"Geraint F.",
""
]
] | It has recently been claimed that relativity's most famous equation, E = mc^2, has a cosmological basis, representing the gravitational binding energy for a particle to escape from the origin to a gravitational horizon of the universe. In this paper, I examine these claims in detail, concluding that they result from a ... |
gr-qc/0310047 | Erico Tanaka | Takayoshi Ootsuka, Erico Tanaka, Kousuke Ura | Chiral gravity in higher dimensions | 18 pages, no figures. Minor typos corrected. Updated references | Class.Quant.Grav. 21 (2003) 975-985 | 10.1088/0264-9381/21/4/017 | null | gr-qc hep-th | null | We construct a chiral theory of gravity in 7 and 8 dimensions, which are
equivalent to Einstein-Cartan theory using less variables. In these dimensions,
we can construct such higher dimensional chiral gravity because of the
existence of gravitational instanton. The octonionic-valued variables in the
theory represent ... | [
{
"created": "Wed, 8 Oct 2003 14:42:50 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Oct 2003 10:24:37 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Ootsuka",
"Takayoshi",
""
],
[
"Tanaka",
"Erico",
""
],
[
"Ura",
"Kousuke",
""
]
] | We construct a chiral theory of gravity in 7 and 8 dimensions, which are equivalent to Einstein-Cartan theory using less variables. In these dimensions, we can construct such higher dimensional chiral gravity because of the existence of gravitational instanton. The octonionic-valued variables in the theory represent th... |
gr-qc/0309064 | Mariusz Dabrowski P. | Mariusz P. Dabrowski and Janusz Garecki | Energy-momentum and angular momentum of Goedel universes | an amended version, 24 pages, accepted to PRD | Phys.Rev. D70 (2004) 043511 | 10.1103/PhysRevD.70.043511 | null | gr-qc astro-ph hep-th | null | We discuss the Einstein energy-momentum complex and the Bergmann-Thomson
angular momentum complex in general relativity and calculate them for
space-time homogeneous Goedel universes. The calculations are performed for a
dust acausal model and for a scalar-field causal model. It is shown that the
Einstein pseudotenso... | [
{
"created": "Fri, 12 Sep 2003 18:27:38 GMT",
"version": "v1"
},
{
"created": "Mon, 17 May 2004 14:19:27 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Dabrowski",
"Mariusz P.",
""
],
[
"Garecki",
"Janusz",
""
]
] | We discuss the Einstein energy-momentum complex and the Bergmann-Thomson angular momentum complex in general relativity and calculate them for space-time homogeneous Goedel universes. The calculations are performed for a dust acausal model and for a scalar-field causal model. It is shown that the Einstein pseudotensor ... |
2110.04617 | Giulia Maniccia | Giulia Maniccia, Giovanni Montani | WKB approach to the gravity-matter dynamics: a cosmological
implementation | 10 pages. Proceeding of the Quantum Gravity Phenomenology Parallel
Session, 16th Marcel Grossmann Meeting, July 2021 | The Sixteenth Marcel Grossmann Meeting (2023) 4146-4158 | 10.1142/9789811269776_0345 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The problem of time emerging in the canonical quantization procedure of
gravity signals a necessity to properly define a relational time parameter.
Previous approaches, which are here briefly discussed, make use of the
dependence of the quantum system on semiclassical gravitational variables in
order to define time. ... | [
{
"created": "Sat, 9 Oct 2021 17:32:39 GMT",
"version": "v1"
}
] | 2023-02-01 | [
[
"Maniccia",
"Giulia",
""
],
[
"Montani",
"Giovanni",
""
]
] | The problem of time emerging in the canonical quantization procedure of gravity signals a necessity to properly define a relational time parameter. Previous approaches, which are here briefly discussed, make use of the dependence of the quantum system on semiclassical gravitational variables in order to define time. We... |
1505.04730 | Przemyslaw Malkiewicz | Przemyslaw Malkiewicz | What is Dynamics in Quantum Gravity? | 14 pages, 6 figures | Class. Quantum Grav. 34 (2017) 205001 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The appearance of Hamiltonian constraint in the canonical formalism for
general relativity reflects the lack of a fixed external time. The dynamics of
general relativistic systems can be expressed with respect to an arbitrarily
chosen internal degree of freedom, the so called internal clock. We investigate
the way in... | [
{
"created": "Mon, 18 May 2015 17:37:31 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Jun 2016 11:26:43 GMT",
"version": "v2"
},
{
"created": "Fri, 2 Jun 2017 16:09:29 GMT",
"version": "v3"
},
{
"created": "Wed, 20 Sep 2017 11:29:41 GMT",
"version": "v4"
}
] | 2017-09-21 | [
[
"Malkiewicz",
"Przemyslaw",
""
]
] | The appearance of Hamiltonian constraint in the canonical formalism for general relativity reflects the lack of a fixed external time. The dynamics of general relativistic systems can be expressed with respect to an arbitrarily chosen internal degree of freedom, the so called internal clock. We investigate the way in w... |
gr-qc/0611146 | Wei Wang | Chunrui Ma and Yuanxing Gui, Wei Wang, Fujun Wang | Massive scalar field quasinormal modes of a Schwarzschild black hole
surrounded by quintessence | 8 pages, 2 figures | null | 10.2478/s11534-008-0056-7 | null | gr-qc | null | We present the quasinormal frequencies of the massive scalar field in the
background of a Schwarzchild black hole surrounded by quintessence with the
third-order WKB method. The mass of the scalar field $u$ plays an important
role in studying the quasinormal frequencies, the real part of the frequencies
increases lin... | [
{
"created": "Tue, 28 Nov 2006 12:52:32 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Nov 2006 01:42:18 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Ma",
"Chunrui",
""
],
[
"Gui",
"Yuanxing",
""
],
[
"Wang",
"Wei",
""
],
[
"Wang",
"Fujun",
""
]
] | We present the quasinormal frequencies of the massive scalar field in the background of a Schwarzchild black hole surrounded by quintessence with the third-order WKB method. The mass of the scalar field $u$ plays an important role in studying the quasinormal frequencies, the real part of the frequencies increases linea... |
1902.01277 | Jose Luis Bl\'azquez-Salcedo | Zahra Altaha Motahar, Jose Luis Bl\'azquez-Salcedo, Daniela D. Doneva,
Jutta Kunz, Stoytcho S. Yazadjiev | Axial quasi-normal modes of scalarized neutron stars with massive
self-interacting scalar field | 13 pages, 5 figures | Phys. Rev. D 99, 104006 (2019) | 10.1103/PhysRevD.99.104006 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the axial quasi-normal modes of neutron stars in scalar-tensor
theories with massive scalar field including a self-interacting term in the
potential. Various realistic equations of state including nuclear, hyperonic
and hybrid matter are employed. Although the effect of spontaneous
scalarization of neutron s... | [
{
"created": "Mon, 4 Feb 2019 16:08:15 GMT",
"version": "v1"
}
] | 2019-05-08 | [
[
"Motahar",
"Zahra Altaha",
""
],
[
"Blázquez-Salcedo",
"Jose Luis",
""
],
[
"Doneva",
"Daniela D.",
""
],
[
"Kunz",
"Jutta",
""
],
[
"Yazadjiev",
"Stoytcho S.",
""
]
] | We study the axial quasi-normal modes of neutron stars in scalar-tensor theories with massive scalar field including a self-interacting term in the potential. Various realistic equations of state including nuclear, hyperonic and hybrid matter are employed. Although the effect of spontaneous scalarization of neutron sta... |
gr-qc/0403051 | Jorge Pullin | Jorge Pullin | Matters of Gravity, the newsletter of the APS Topical Group in
Gravitation | 27 pages, Latex, uses html.sty. Jorge Pullin (Editor) | null | null | MOG-23 | gr-qc | null | GGR News:
We hear that... by Jorge Pullin
* Research Briefs:
Too many coincidences?, by Laura Mersini
The Quest for a Realistic Cosmology in String Theory, by Andrew Chamblin
SFB/TR 7, by A. Gopakumar and D. Petroff
The mock LISA data archive, by John Baker
* Conference reports:
Second Gravitational W... | [
{
"created": "Fri, 12 Mar 2004 18:42:59 GMT",
"version": "v1"
}
] | 2009-03-10 | [
[
"Pullin",
"Jorge",
""
]
] | GGR News: We hear that... by Jorge Pullin * Research Briefs: Too many coincidences?, by Laura Mersini The Quest for a Realistic Cosmology in String Theory, by Andrew Chamblin SFB/TR 7, by A. Gopakumar and D. Petroff The mock LISA data archive, by John Baker * Conference reports: Second Gravitational Wave Phenomenology ... |
2402.10479 | Homa Shababi | Homa Shababi, Tanwi Bandyopadhyay, Ujjal Debnath | On the entropy corrected thermal features of black holes | 12 pages, 9 figures, Latex2e source file | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this work, we investigate the thermal properties of black holes using a
new class of generalized entropy functions [K. Ourabah, Class. Quantum Grav.,
41, 015010 (2024)]. At the fundamental level, these entropic forms are
associated with alternative gravitational laws, within an entropic gravity
framework. Our inve... | [
{
"created": "Fri, 16 Feb 2024 06:58:17 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Apr 2024 03:03:37 GMT",
"version": "v2"
}
] | 2024-04-15 | [
[
"Shababi",
"Homa",
""
],
[
"Bandyopadhyay",
"Tanwi",
""
],
[
"Debnath",
"Ujjal",
""
]
] | In this work, we investigate the thermal properties of black holes using a new class of generalized entropy functions [K. Ourabah, Class. Quantum Grav., 41, 015010 (2024)]. At the fundamental level, these entropic forms are associated with alternative gravitational laws, within an entropic gravity framework. Our invest... |
1809.05367 | Gerard Hooft 't | Gerard `t Hooft | Discreteness of Black Hole Microstates | 7 pages, 1 figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is explained that, for black holes much heavier than the Planck mass,
black hole microstates can be well understood without string theory. It is
essential to understand the antipodal identification at the horizon. We show
why the microstates exhibit a discrete spectrum, and how they relate to the
particles outside... | [
{
"created": "Fri, 14 Sep 2018 11:54:52 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Sep 2018 17:55:30 GMT",
"version": "v2"
}
] | 2018-10-02 | [
[
"Hooft",
"Gerard `t",
""
]
] | It is explained that, for black holes much heavier than the Planck mass, black hole microstates can be well understood without string theory. It is essential to understand the antipodal identification at the horizon. We show why the microstates exhibit a discrete spectrum, and how they relate to the particles outside t... |
1910.10592 | Rui Niu | Rui Niu, Xing Zhang, Tan Liu, Jiming Yu, Bo Wang, Wen Zhao | Constraining Screened Modified Gravity by Space-borne Gravitational-wave
Detectors | 47 pages, 5 figures; matches accepted version | 2020 ApJ 890 163 | 10.3847/1538-4357/ab6d03 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The screened modified gravity (SMG) is a unified theoretical framework, which
describes the scalar-tensor gravity with screening mechanism. Based on the
gravitational-wave (GW) waveform derived in our previous work
\citep{liu2018waveforms}, in this article we investigate the potential
constraints on SMG theory throug... | [
{
"created": "Wed, 23 Oct 2019 14:50:45 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Feb 2020 13:51:04 GMT",
"version": "v2"
}
] | 2020-02-28 | [
[
"Niu",
"Rui",
""
],
[
"Zhang",
"Xing",
""
],
[
"Liu",
"Tan",
""
],
[
"Yu",
"Jiming",
""
],
[
"Wang",
"Bo",
""
],
[
"Zhao",
"Wen",
""
]
] | The screened modified gravity (SMG) is a unified theoretical framework, which describes the scalar-tensor gravity with screening mechanism. Based on the gravitational-wave (GW) waveform derived in our previous work \citep{liu2018waveforms}, in this article we investigate the potential constraints on SMG theory through ... |
2312.06418 | Anish Agashe | Anish Agashe | Lagrangian Formulation of the Raychaudhuri Equation in Non-Riemannian
Geometry | Accepted for publication in Int. J Geom. Meth. Mod. Phys | Int. J. Geom. Meth. Mod. Phys., 21, 06, 2450120 (2024) | 10.1142/S0219887824501202 | null | gr-qc math-ph math.DG math.MP | http://creativecommons.org/licenses/by/4.0/ | The Raychaudhuri equation for a congruence of curves in a general
non-Riemannian geometry is derived. A formal connection is established between
the expansion scalar and the cross-sectional volume of the congruence. It is
found that the expansion scalar is equal to the fractional rate of change of
volume, weighted by... | [
{
"created": "Mon, 11 Dec 2023 14:38:01 GMT",
"version": "v1"
}
] | 2024-06-18 | [
[
"Agashe",
"Anish",
""
]
] | The Raychaudhuri equation for a congruence of curves in a general non-Riemannian geometry is derived. A formal connection is established between the expansion scalar and the cross-sectional volume of the congruence. It is found that the expansion scalar is equal to the fractional rate of change of volume, weighted by a... |
gr-qc/9602060 | Adam Helfer | Adam D. Helfer | The Stress-Energy Operator | Exposition improved. To appear in Letters to Classical and Quantum
Gravity. Eight pp., plain Tex, IOP macros | Class.Quant.Grav.13:L129-L134,1996 | 10.1088/0264-9381/13/11/002 | null | gr-qc | null | We compute the stress--energy operator for a scalar linear quantum field in
curved space-time, modulo c-numbers. For the associated Hamiltonian operators,
even those generating evolution along timelike vector fields, we find that in
general on locally Fock-like (`Hadamard') representations: (a) The Hamiltonians
canno... | [
{
"created": "Wed, 28 Feb 1996 18:24:45 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Sep 1996 19:36:00 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Helfer",
"Adam D.",
""
]
] | We compute the stress--energy operator for a scalar linear quantum field in curved space-time, modulo c-numbers. For the associated Hamiltonian operators, even those generating evolution along timelike vector fields, we find that in general on locally Fock-like (`Hadamard') representations: (a) The Hamiltonians cannot ... |
2402.02050 | Vasilis Oikonomou | V.K. Oikonomou | Non-minimal Derivative Coupling Theories Compatible with GW170817 | NPB Accepted | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we aim to revive the interest for non-minimal derivative
coupling theories of gravity, in light of the GW170817 event. These theories
include a string motivated non-minimal kinetic term for the scalar field of the
form $\sim \xi(\phi) G^{\mu\nu}\partial_\mu\phi\partial_\nu\phi$ and predict
that the primo... | [
{
"created": "Sat, 3 Feb 2024 05:57:04 GMT",
"version": "v1"
}
] | 2024-02-06 | [
[
"Oikonomou",
"V. K.",
""
]
] | In this work we aim to revive the interest for non-minimal derivative coupling theories of gravity, in light of the GW170817 event. These theories include a string motivated non-minimal kinetic term for the scalar field of the form $\sim \xi(\phi) G^{\mu\nu}\partial_\mu\phi\partial_\nu\phi$ and predict that the primord... |
gr-qc/9906063 | Sukanta Bose | Sukanta Bose and Naresh Dadhich (Inter-University Centre for Astronomy
and Astrophysics, Pune, India) | On the Brown-York quasilocal energy, gravitational charge, and black
hole horizons | 13 pages, RevTex. To appear in Physical Review D | Phys.Rev. D60 (1999) 064010 | 10.1103/PhysRevD.60.064010 | IUCAA-34/98 | gr-qc hep-th | null | We study a recently proposed horizon defining identity for certain black hole
spacetimes. It relates the difference of the Brown-York quasilocal energy and
the Komar charge at the horizon to the total energy of the spacetime. The
Brown-York quasilocal energy is evaluated for some specific choices of
spacetime foliati... | [
{
"created": "Wed, 16 Jun 1999 16:22:51 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Bose",
"Sukanta",
"",
"Inter-University Centre for Astronomy\n and Astrophysics, Pune, India"
],
[
"Dadhich",
"Naresh",
"",
"Inter-University Centre for Astronomy\n and Astrophysics, Pune, India"
]
] | We study a recently proposed horizon defining identity for certain black hole spacetimes. It relates the difference of the Brown-York quasilocal energy and the Komar charge at the horizon to the total energy of the spacetime. The Brown-York quasilocal energy is evaluated for some specific choices of spacetime foliation... |
1002.3472 | Bibekananda Nayak jr | B. Nayak, A. S. Majumdar and L. P. Singh | Astrophysical constraints on primordial black holes in Brans-Dicke
theory | 15 pages | JCAP 1008:039,2010 | 10.1088/1475-7516/2010/08/039 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider cosmological evolution in Brans-Dicke theory with a population of
primordial black holes. Hawking radiation from the primordial black holes
impacts various astrophysical processes during the evolution of the Universe.
The accretion of radiation by the black holes in the radiation dominated era
may be effe... | [
{
"created": "Thu, 18 Feb 2010 10:15:15 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Feb 2010 06:25:41 GMT",
"version": "v2"
},
{
"created": "Fri, 3 Sep 2010 10:30:01 GMT",
"version": "v3"
}
] | 2012-01-20 | [
[
"Nayak",
"B.",
""
],
[
"Majumdar",
"A. S.",
""
],
[
"Singh",
"L. P.",
""
]
] | We consider cosmological evolution in Brans-Dicke theory with a population of primordial black holes. Hawking radiation from the primordial black holes impacts various astrophysical processes during the evolution of the Universe. The accretion of radiation by the black holes in the radiation dominated era may be effect... |
1202.3595 | Alf Tang | Alf Tang and Timothy J. Sumner | Detecting Cosmic Gravitational-wave Background from Super-heavy Cosmic
Strings with LISA | 10 pages, 7 figures | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Although cosmic string scenario for galaxy formation is disfavored by CMB
data, it is of great interest in the generation of cosmic gravitational-wave
background. This research aims to develop an algorithm to extract cosmic
gravitational-wave background produced by cosmic strings from the LISA data
stream, and apply ... | [
{
"created": "Thu, 16 Feb 2012 14:14:59 GMT",
"version": "v1"
}
] | 2012-02-20 | [
[
"Tang",
"Alf",
""
],
[
"Sumner",
"Timothy J.",
""
]
] | Although cosmic string scenario for galaxy formation is disfavored by CMB data, it is of great interest in the generation of cosmic gravitational-wave background. This research aims to develop an algorithm to extract cosmic gravitational-wave background produced by cosmic strings from the LISA data stream, and apply th... |
gr-qc/0310006 | Don N. Page | Don N. Page | Classical and Quantum Decay of Oscillatons: Oscillating Self-Gravitating
Real Scalar Field Solitons | 75 pages, LaTeX | Phys.Rev. D70 (2004) 023002 | 10.1103/PhysRevD.70.023002 | Alberta-Thy-10-03 | gr-qc | null | The oscillating gravitational field of an oscillaton of finite mass M causes
it to lose energy by emitting classical scalar field waves, but at a rate that
is non-perturbatively tiny for small GMm, where m is the scalar field mass:
d(GM)/dt ~ -3797437.776333015 e^[-39.433795197160163/(GMm)]/(GMm)^2.
Oscillatons also ... | [
{
"created": "Thu, 2 Oct 2003 19:57:34 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Page",
"Don N.",
""
]
] | The oscillating gravitational field of an oscillaton of finite mass M causes it to lose energy by emitting classical scalar field waves, but at a rate that is non-perturbatively tiny for small GMm, where m is the scalar field mass: d(GM)/dt ~ -3797437.776333015 e^[-39.433795197160163/(GMm)]/(GMm)^2. Oscillatons also de... |
1409.0067 | Marcus Khuri | Qing Han, Marcus Khuri | The Conformal Flow of Metrics and the General Penrose Inequality | 13 pages; minor revisions | Adv. Math. Phys., Vol. 2018, Art. ID 7390148 | null | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The conformal flow of metrics [2] has been used to successfully establish a
special case of the Penrose inequality, which yields a lower bound for the
total mass of a spacetime in terms of horizon area. Here we show how to adapt
the conformal flow of metrics, so that it may be applied to the Penrose
inequality for ge... | [
{
"created": "Sat, 30 Aug 2014 00:21:47 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Jan 2017 19:46:10 GMT",
"version": "v2"
},
{
"created": "Mon, 29 Jan 2018 22:27:10 GMT",
"version": "v3"
}
] | 2018-06-28 | [
[
"Han",
"Qing",
""
],
[
"Khuri",
"Marcus",
""
]
] | The conformal flow of metrics [2] has been used to successfully establish a special case of the Penrose inequality, which yields a lower bound for the total mass of a spacetime in terms of horizon area. Here we show how to adapt the conformal flow of metrics, so that it may be applied to the Penrose inequality for gene... |
gr-qc/0201045 | Marc Mars | Marc Mars, Jose M.M. Senovilla | Axial symmetry and conformal Killing vectors | 15 pages, Latex, no figures | Class.Quant.Grav.10:1633-1647,1993 | 10.1088/0264-9381/10/8/020 | null | gr-qc | null | Axisymmetric spacetimes with a conformal symmetry are studied and it is shown
that, if there is no further conformal symmetry, the axial Killing vector and
the conformal Killing vector must commute. As a direct consequence, in
conformally stationary and axisymmetric spacetimes, no restriction is made by
assuming that... | [
{
"created": "Mon, 14 Jan 2002 19:44:17 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Mars",
"Marc",
""
],
[
"Senovilla",
"Jose M. M.",
""
]
] | Axisymmetric spacetimes with a conformal symmetry are studied and it is shown that, if there is no further conformal symmetry, the axial Killing vector and the conformal Killing vector must commute. As a direct consequence, in conformally stationary and axisymmetric spacetimes, no restriction is made by assuming that t... |
1103.4482 | Wolfgang Koehler | Wolfgang Koehler | Matrix theory of gravitation | 24 pages | null | 10.1007/s10714-011-1158-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new classical theory of gravitation within the framework of general
relativity is presented. It is based on a matrix formulation of
four-dimensional Riemann-spaces and uses no artificial fields or adjustable
parameters. The geometrical stress-energy tensor is derived from a matrix-trace
Lagrangian, which is not equ... | [
{
"created": "Wed, 23 Mar 2011 10:28:03 GMT",
"version": "v1"
}
] | 2011-03-24 | [
[
"Koehler",
"Wolfgang",
""
]
] | A new classical theory of gravitation within the framework of general relativity is presented. It is based on a matrix formulation of four-dimensional Riemann-spaces and uses no artificial fields or adjustable parameters. The geometrical stress-energy tensor is derived from a matrix-trace Lagrangian, which is not equiv... |
1307.5005 | Spiros Cotsakis | John D. Barrow, S. Cotsakis | Geodesics at Sudden Singularities | v2: 7 pages, minor improvements, version to appear in PRD | Phys. Rev. D88 (2013) 067301 | 10.1103/PhysRevD.88.067301 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that a general solution of the Einstein equations that describes
approach to an inhomogeneous and anisotropic sudden spacetime singularity does
not experience geodesic incompleteness. This generalises the result established
for isotropic and homogeneous universes. Further discussion of the weakness of
the sin... | [
{
"created": "Thu, 18 Jul 2013 16:33:27 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Aug 2013 12:51:26 GMT",
"version": "v2"
}
] | 2013-09-11 | [
[
"Barrow",
"John D.",
""
],
[
"Cotsakis",
"S.",
""
]
] | We show that a general solution of the Einstein equations that describes approach to an inhomogeneous and anisotropic sudden spacetime singularity does not experience geodesic incompleteness. This generalises the result established for isotropic and homogeneous universes. Further discussion of the weakness of the singu... |
2201.06903 | Alfonso Garc\'ia-Parrado G\'omez-Lobo Dr. | Alfonso Garc\'ia-Parrado | $pp$-wave initial data | 7 pages, no figures | null | 10.1007/s10714-022-02938-z | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An initial data characterization for vacuum $pp$-wave spacetimes in dimension
four is constructed. This is a vacuum initial data set plus some extra
conditions guaranteeing that the data development is a subset of a vacuum
$pp$-wave. Some of the extra conditions only depend on the same quantities used
to construct th... | [
{
"created": "Tue, 18 Jan 2022 12:19:17 GMT",
"version": "v1"
}
] | 2022-06-15 | [
[
"García-Parrado",
"Alfonso",
""
]
] | An initial data characterization for vacuum $pp$-wave spacetimes in dimension four is constructed. This is a vacuum initial data set plus some extra conditions guaranteeing that the data development is a subset of a vacuum $pp$-wave. Some of the extra conditions only depend on the same quantities used to construct the ... |
1804.02971 | Hamid Reza Fazlollahi | H. R. Fazlollahi | F(R) cosmology via Noether symmetry and lambda-Chaplygin Gas like model | 5 pages, 3 figures | null | 10.1016/j.physletb.2018.04.031 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | In this work, we consider F(R) alternative theories of gravity with an eye to
Noether symmetry through the gauge theorem. For non-vacuum models, one finds
{\Lambda} like gravity with energy density of Chaplygin Gas. We also obtain the
effective equation of state parameter for corresponding cosmology and scale
factor ... | [
{
"created": "Sun, 1 Apr 2018 22:18:12 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Apr 2018 23:01:50 GMT",
"version": "v2"
},
{
"created": "Sun, 17 Jun 2018 15:15:15 GMT",
"version": "v3"
}
] | 2018-06-19 | [
[
"Fazlollahi",
"H. R.",
""
]
] | In this work, we consider F(R) alternative theories of gravity with an eye to Noether symmetry through the gauge theorem. For non-vacuum models, one finds {\Lambda} like gravity with energy density of Chaplygin Gas. We also obtain the effective equation of state parameter for corresponding cosmology and scale factor be... |
2208.00521 | Zaza Osmanov | N. Giorgadze and Z.N. Osmanov | Dynamics of a particle in the generalised Ellis-Bronnikov wormhole on
the rotating Archimede's spiral | 13 pages, 8 figures | null | null | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | A particle moving on curved magnetic field lines in the wormhole metrics is
considered. The dynamics of a single particle is studied on a co-rotating
parameterized magnetic field line. Being interested in the force-free dynamics
we choose the rotating Archimedes' spiral embedded in the generalized
Ellis-Bronnikov met... | [
{
"created": "Sun, 31 Jul 2022 21:09:13 GMT",
"version": "v1"
}
] | 2022-08-02 | [
[
"Giorgadze",
"N.",
""
],
[
"Osmanov",
"Z. N.",
""
]
] | A particle moving on curved magnetic field lines in the wormhole metrics is considered. The dynamics of a single particle is studied on a co-rotating parameterized magnetic field line. Being interested in the force-free dynamics we choose the rotating Archimedes' spiral embedded in the generalized Ellis-Bronnikov metri... |
1110.2091 | Stephen Casey Mr | Stephen Casey | Kastor-Traschen Black Holes, Null Geodesics and Conformal Circles | 24 pages, 11 figures | Class. Quant. Grav. 29 (2012) 135006 | 10.1088/0264-9381/29/13/135006 | DAMTP-2011-85 | gr-qc hep-th math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Kastor-Traschen metric is a time-dependent solution of the
Einstein-Maxwell equations with positive cosmological constant $\Lambda$ which
can be used to describe an arbitrary number of charged dynamical black holes.
In this paper, we consider the null geodesic structure of this solution, in
particular, focusing o... | [
{
"created": "Mon, 10 Oct 2011 16:14:34 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Apr 2012 16:07:53 GMT",
"version": "v2"
}
] | 2015-05-30 | [
[
"Casey",
"Stephen",
""
]
] | The Kastor-Traschen metric is a time-dependent solution of the Einstein-Maxwell equations with positive cosmological constant $\Lambda$ which can be used to describe an arbitrary number of charged dynamical black holes. In this paper, we consider the null geodesic structure of this solution, in particular, focusing on ... |
1704.06653 | M. Farasat Shamir | M. Farasat Shamir, Fiza Kanwal | Noether Symmetry Analysis of Anisotropic Universe in Modified Gravity | 17 Pages | Eur. Phys. J. C 77(2017)286 | 10.1140/epjc/s10052-017-4869-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study anisotropic universe using Noether symmetries in
modified gravity. In particular, we choose locally rotationally symmetric
Bianchi type-$I$ universe for the analysis in $f(R,\mathcal{G})$ gravity, where
$R$ is the Ricci scalar and $\mathcal{G}$ is the Gauss-Bonnet invariant.
Firstly, a model $... | [
{
"created": "Fri, 21 Apr 2017 11:54:49 GMT",
"version": "v1"
}
] | 2017-05-18 | [
[
"Shamir",
"M. Farasat",
""
],
[
"Kanwal",
"Fiza",
""
]
] | In this paper, we study anisotropic universe using Noether symmetries in modified gravity. In particular, we choose locally rotationally symmetric Bianchi type-$I$ universe for the analysis in $f(R,\mathcal{G})$ gravity, where $R$ is the Ricci scalar and $\mathcal{G}$ is the Gauss-Bonnet invariant. Firstly, a model $f(... |
gr-qc/9806113 | Scott Foster | S. Foster | Scalar Field Cosmological Models With Hard Potential Walls | 9 Pages, 4 figures | null | null | ADP-98-27/M67 | gr-qc | null | The global behavior of scalar field cosmological models with very hard
potential walls is investigated via the simple example of an exponentially
steep potential well. It is found that the solutions exhibit a non-trivial
oscillatory behavior in the approach to an initial space-time singularity. This
behavior can be i... | [
{
"created": "Mon, 29 Jun 1998 06:28:30 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Foster",
"S.",
""
]
] | The global behavior of scalar field cosmological models with very hard potential walls is investigated via the simple example of an exponentially steep potential well. It is found that the solutions exhibit a non-trivial oscillatory behavior in the approach to an initial space-time singularity. This behavior can be int... |
gr-qc/0008047 | Risto Tammelo | R. Mankin, T. Laas, R. Tammelo | A new approach to electromagnetic wave tails on a curved spacetime | RevTex, 28 pages, 5 eps figures, http://www.tpu.ee/~tony/texdocs/, 4
changes made (pp. 2, 4, 22, 24), 2 references added | Phys.Rev. D63 (2001) 063003 | 10.1103/PhysRevD.63.063003 | null | gr-qc | null | We present an alternative method for constructing the exact and approximate
solutions of electromagnetic wave equations whose source terms are arbitrary
order multipoles on a curved spacetime. The developed method is based on the
higher-order Green's functions for wave equations which are defined as
distributions tha... | [
{
"created": "Fri, 18 Aug 2000 19:48:23 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Sep 2000 18:41:24 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Mankin",
"R.",
""
],
[
"Laas",
"T.",
""
],
[
"Tammelo",
"R.",
""
]
] | We present an alternative method for constructing the exact and approximate solutions of electromagnetic wave equations whose source terms are arbitrary order multipoles on a curved spacetime. The developed method is based on the higher-order Green's functions for wave equations which are defined as distributions that ... |
2203.00011 | Justin Feng | Justin C. Feng, Shinji Mukohyama, Sante Carloni | Junction conditions and sharp gradients in generalized coupling theories | 17 pages, 7 figures | Physical Review D 105, 104036 (2022) | 10.1103/PhysRevD.105.104036 | YITP-22-18, IPMU22-0004 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we develop the formalism for singular hypersurfaces and
junction conditions in generalized coupling theories using a variational
approach. We then employ this formalism to examine the behavior of sharp matter
density gradients in generalized coupling theories. We find that such gradients
do not neces... | [
{
"created": "Mon, 28 Feb 2022 19:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 17 May 2022 15:20:24 GMT",
"version": "v2"
}
] | 2022-05-18 | [
[
"Feng",
"Justin C.",
""
],
[
"Mukohyama",
"Shinji",
""
],
[
"Carloni",
"Sante",
""
]
] | In this article, we develop the formalism for singular hypersurfaces and junction conditions in generalized coupling theories using a variational approach. We then employ this formalism to examine the behavior of sharp matter density gradients in generalized coupling theories. We find that such gradients do not necessa... |
gr-qc/0401094 | Banibrata Mukhopadhyay | Banibrata Mukhopadhyay and Naresh Dadhich | Scalar and spinor perturbation to the most generalised Kerr-NUT
space-time | 3 latex pages including 1 figure; to appear in the proceedings of X
Marcel Grossmann Meeting, Rio de Janeiro, 20-26 July 2003; on the basis of
talk presented | null | 10.1142/9789812704030_0240 | null | gr-qc astro-ph | null | We study the scalar and spinor perturbation to Kerr-NUT space-time, that is,
Klein-Gordan and Dirac equation therein. The equations are invariant under
duality transformation between the gravitational electric (M) and magnetic (l)
charge, radial and angular coordinate, and radial and angular component of the
field. W... | [
{
"created": "Thu, 22 Jan 2004 10:20:02 GMT",
"version": "v1"
}
] | 2016-11-09 | [
[
"Mukhopadhyay",
"Banibrata",
""
],
[
"Dadhich",
"Naresh",
""
]
] | We study the scalar and spinor perturbation to Kerr-NUT space-time, that is, Klein-Gordan and Dirac equation therein. The equations are invariant under duality transformation between the gravitational electric (M) and magnetic (l) charge, radial and angular coordinate, and radial and angular component of the field. We ... |
1602.03838 | LVC Publications | The LIGO Scientific Collaboration and The Virgo Collaboration | GW150914: The Advanced LIGO Detectors in the Era of First Discoveries | null | Phys. Rev. Lett. 116, 131103 (2016) | 10.1103/PhysRevLett.116.131103 | LIGO-P1500237 | gr-qc astro-ph.HE astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Following a major upgrade, the two advanced detectors of the Laser
Interferometer Gravitational-wave Observatory (LIGO) held their first
observation run between September 2015 and January 2016. With a strain
sensitivity of $10^{-23}/\sqrt{\mathrm{Hz}}$ at 100 Hz, the product of
observable volume and measurement time ... | [
{
"created": "Thu, 11 Feb 2016 19:26:45 GMT",
"version": "v1"
}
] | 2016-04-06 | [
[
"The LIGO Scientific Collaboration",
"",
""
],
[
"The Virgo Collaboration",
"",
""
]
] | Following a major upgrade, the two advanced detectors of the Laser Interferometer Gravitational-wave Observatory (LIGO) held their first observation run between September 2015 and January 2016. With a strain sensitivity of $10^{-23}/\sqrt{\mathrm{Hz}}$ at 100 Hz, the product of observable volume and measurement time ex... |
1406.0572 | Jos\'e Eduardo Rosales Quintero Dr. | J. Berra-Montiel and J.E. Rosales-Quintero | Discrete canonical analysis of three dimensional gravity with
cosmological constant | 19 pages, 1 figure. arXiv admin note: text overlap with
arXiv:1310.3759, arXiv:gr-qc/0512065, arXiv:1111.1879 by other authors | International Journal of Modern Physics A. Vol 30 (2015) | 10.1142/S0217751X15500803 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the interplay between standard canonical analysis and canonical
discretization in three-dimensional gravity with cosmological constant. By
using the Hamiltonian analysis, we find that the continuum local symmetries of
the theory are given by the on-shell space-time diffeomorphisms, which at the
action leve... | [
{
"created": "Tue, 3 Jun 2014 04:04:25 GMT",
"version": "v1"
}
] | 2015-05-19 | [
[
"Berra-Montiel",
"J.",
""
],
[
"Rosales-Quintero",
"J. E.",
""
]
] | We discuss the interplay between standard canonical analysis and canonical discretization in three-dimensional gravity with cosmological constant. By using the Hamiltonian analysis, we find that the continuum local symmetries of the theory are given by the on-shell space-time diffeomorphisms, which at the action level,... |
2003.06380 | Adam Balcerzak | Adam Balcerzak, Konrad Marosek | Doubleverse entanglement in third quantized non-minimally coupled
varying constants cosmologies | 9 pages, 4 figures | Eur. Phys. J. C 80, 709 (2020) | 10.1140/epjc/s10052-020-8305-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we consider a third quantized cosmological model with varying
speed of light $c$ and varying gravitational constant $G$ both represented by
non-minimally coupled scalar fields. The third quantization of such a model
leads to a scenario of the doubleverse with the two components being quantum
mechanicall... | [
{
"created": "Fri, 13 Mar 2020 16:57:51 GMT",
"version": "v1"
},
{
"created": "Sun, 22 Mar 2020 09:42:20 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Aug 2020 15:05:37 GMT",
"version": "v3"
}
] | 2020-08-10 | [
[
"Balcerzak",
"Adam",
""
],
[
"Marosek",
"Konrad",
""
]
] | In this paper we consider a third quantized cosmological model with varying speed of light $c$ and varying gravitational constant $G$ both represented by non-minimally coupled scalar fields. The third quantization of such a model leads to a scenario of the doubleverse with the two components being quantum mechanically ... |
2303.02140 | Celia Escamilla-Rivera | Celia Escamilla-Rivera and Jos\'e Antonio N\'ajera | Comment on: "Questioning the $H_0$ tension via the look-back time" | Strong corrections on the calculations | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, it has been proposed that Hubble tension can be addressed in the
$\Lambda$CDM model if the lookback time approach is considered on the redshift
$z$ measured. From this interesting proposal, the lookback time evolution seems
to match the observational values of the current Hubble parameter $H_0$ at any
$z$. ... | [
{
"created": "Fri, 3 Mar 2023 18:35:06 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Mar 2023 07:41:28 GMT",
"version": "v2"
}
] | 2023-03-07 | [
[
"Escamilla-Rivera",
"Celia",
""
],
[
"Nájera",
"José Antonio",
""
]
] | Recently, it has been proposed that Hubble tension can be addressed in the $\Lambda$CDM model if the lookback time approach is considered on the redshift $z$ measured. From this interesting proposal, the lookback time evolution seems to match the observational values of the current Hubble parameter $H_0$ at any $z$. In... |
2003.14073 | Sugumi Kanno | Sugumi Kanno, Jiro Soda | Polarized initial states of primordial gravitational waves | 6 pages. Invited contribution to appear in a special issue on
"Symmetry with Gravity and Particle Theories" in Symmetry | null | null | OU-HET-1050, KOBE-COSMO-20-06 | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Polarizations of primordial gravitational waves can be relevant when
considering inflationary universe in modified gravity or when matter fields
survive during inflation. Such polarizations have been discussed in the
Bunch-Davies vacuum. Instead of taking into account dynamical generation of
polarizations of gravitat... | [
{
"created": "Tue, 31 Mar 2020 10:20:17 GMT",
"version": "v1"
}
] | 2020-04-01 | [
[
"Kanno",
"Sugumi",
""
],
[
"Soda",
"Jiro",
""
]
] | Polarizations of primordial gravitational waves can be relevant when considering inflationary universe in modified gravity or when matter fields survive during inflation. Such polarizations have been discussed in the Bunch-Davies vacuum. Instead of taking into account dynamical generation of polarizations of gravitatio... |
gr-qc/0504060 | Michele Zanolin | L.Blackburn, F.Beauville, M.-A.Bizouard, L.Bosi, P.Brady, L.Brocco,
D.Brown, D.Buskulic, S.Chatterji, N.Christensen, A.-C.Clapson, S.Fairhurst,
D.Grosjean, G.Guidi, P.Hello, E.Katsavounidis, M.Knight, A.Lazzarini,
F.Marion, B.Mours, F.Ricci, A.Vicere, M.Zanolin (The joint LIGO/Virgo working
group) | A first comparison of search methods for gravitational wave bursts using
LIGO and Virgo simulated data | GWDAW9 proceedings | Class.Quant.Grav. 22 (2005) S1293-S1302 | null | null | gr-qc | null | We present a comparative study of 6 search methods for gravitational wave
bursts using simulated LIGO and Virgo noise data. The data's spectra were
chosen to follow the design sensitivity of the two 4km LIGO interferometers and
the 3km Virgo interferometer. The searches were applied on replicas of the data
sets to wh... | [
{
"created": "Wed, 13 Apr 2005 19:42:08 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Blackburn",
"L.",
"",
"The joint LIGO/Virgo working\n group"
],
[
"Beauville",
"F.",
"",
"The joint LIGO/Virgo working\n group"
],
[
"Bizouard",
"M. -A.",
"",
"The joint LIGO/Virgo working\n group"
],
[
"Bosi",
"L.",
"",
"The joint LI... | We present a comparative study of 6 search methods for gravitational wave bursts using simulated LIGO and Virgo noise data. The data's spectra were chosen to follow the design sensitivity of the two 4km LIGO interferometers and the 3km Virgo interferometer. The searches were applied on replicas of the data sets to whic... |
gr-qc/9702043 | Matt Visser | Matt Visser (Washington University) | Traversable wormholes: the Roman ring | 4 pages; ReV_TeX 3.0 in twocolumn mode; two line drawings using the
LaTeX picture environment; Accepted for publication in Physical Review D15 | Phys.Rev. D55 (1997) 5212-5214 | 10.1103/PhysRevD.55.5212 | null | gr-qc hep-th | null | In this brief report I introduce a yet another class of geometries for which
semi-classical chronology protection theorems are of dubious physical
reliability. I consider a ``Roman ring'' of traversable wormholes, wherein a
number of wormholes are arranged in a ring in such a manner that no subset of
wormholes is nea... | [
{
"created": "Fri, 21 Feb 1997 20:18:59 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Visser",
"Matt",
"",
"Washington University"
]
] | In this brief report I introduce a yet another class of geometries for which semi-classical chronology protection theorems are of dubious physical reliability. I consider a ``Roman ring'' of traversable wormholes, wherein a number of wormholes are arranged in a ring in such a manner that no subset of wormholes is near ... |
gr-qc/0601100 | Iver. H. Brevik | Iver Brevik | Crossing of the w=-1 barrier in viscous modified gravity | 12 pages, latex, no figures | Int.J.Mod.Phys.D15:767-776,2006 | 10.1142/S0218271806008528 | null | gr-qc hep-th | null | We consider a modified form of gravity in which the action contains a power
alpha of the scalar curvature. It is shown how the presence of a bulk viscosity
in a spatially flat universe may drive the cosmic fluid into the phantom region
(w<-1) and thus into a Big Rip singularity, even if it lies in the quintessence
re... | [
{
"created": "Tue, 24 Jan 2006 09:59:38 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Brevik",
"Iver",
""
]
] | We consider a modified form of gravity in which the action contains a power alpha of the scalar curvature. It is shown how the presence of a bulk viscosity in a spatially flat universe may drive the cosmic fluid into the phantom region (w<-1) and thus into a Big Rip singularity, even if it lies in the quintessence regi... |
gr-qc/0105109 | Juan A. Valiente-Kroon | S. Dain, J.A. Valiente-Kroon | Conserved quantities in a black hole collision | 4 pages | Class.Quant.Grav. 19 (2002) 811-816 | 10.1088/0264-9381/19/4/312 | null | gr-qc | null | The Newman-Penrose constants of the spacetime corresponding to the
development of the Brill-Lindquist initial data are calculated by making use of
a particular representation of spatial infinity due to H. Friedrich. The
Brill-Lindquist initial data set represents the head-on collision of two
non-rotating black holes.... | [
{
"created": "Mon, 28 May 2001 14:05:59 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Dain",
"S.",
""
],
[
"Valiente-Kroon",
"J. A.",
""
]
] | The Newman-Penrose constants of the spacetime corresponding to the development of the Brill-Lindquist initial data are calculated by making use of a particular representation of spatial infinity due to H. Friedrich. The Brill-Lindquist initial data set represents the head-on collision of two non-rotating black holes. I... |
1602.02418 | Halil Kuyrukcu | Halil Kuyrukcu | A black hole solution of higher-dimensional Weyl-Yang-Kaluza-Klein
theory | Revised version | Classical and Quantum Gravity 2021; 38 (17): 175009 | 10.1088/1361-6382/ac161a | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider the Weyl$-$Yang gauge theory of gravitation in a
$(4+3)$-dimensional curved space-time within the scenario of the non-Abelian
Kaluza$-$Klein theory for the source and torsion-free limits. The explicit
forms of the field equations containing a new spin current term and the
energy-momentum tensors in the us... | [
{
"created": "Sun, 7 Feb 2016 20:16:59 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Sep 2021 17:26:29 GMT",
"version": "v2"
}
] | 2021-09-24 | [
[
"Kuyrukcu",
"Halil",
""
]
] | We consider the Weyl$-$Yang gauge theory of gravitation in a $(4+3)$-dimensional curved space-time within the scenario of the non-Abelian Kaluza$-$Klein theory for the source and torsion-free limits. The explicit forms of the field equations containing a new spin current term and the energy-momentum tensors in the usua... |
1811.11564 | Shijun Yoshida | Shijun Yoshida | Stably stratified stars containing magnetic fields whose toroidal
components are much larger than the poloidal ones in general relativity: A
perturbation analysis | 23 pages, 11 figures. arXiv admin note: text overlap with
arXiv:1207.1942 | Phys. Rev. D 99, 084034 (2019) | 10.1103/PhysRevD.99.084034 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We construct the stably stratified magnetized stars within the framework of
general relativity. The effects of magnetic fields on the structure of the star
and spacetime are treated as perturbations of non-magnetized stars. By assuming
ideal magnetohydrodynamics and employing one-parameter equations of state, we
deri... | [
{
"created": "Tue, 27 Nov 2018 00:51:41 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Mar 2019 03:12:11 GMT",
"version": "v2"
},
{
"created": "Thu, 18 Apr 2019 01:55:51 GMT",
"version": "v3"
}
] | 2019-04-19 | [
[
"Yoshida",
"Shijun",
""
]
] | We construct the stably stratified magnetized stars within the framework of general relativity. The effects of magnetic fields on the structure of the star and spacetime are treated as perturbations of non-magnetized stars. By assuming ideal magnetohydrodynamics and employing one-parameter equations of state, we derive... |
1309.7357 | Martin Kolo\v{s} | M. Kolo\v{s}, Z. Stuchl\'ik | Dynamics of current-carrying string loops in the Kerr naked-singularity
and black-hole spacetimes | 25 pages, 23 figures (2 color figures), PRD style. arXiv admin note:
text overlap with arXiv:1309.6879 | Physical Review D 88 (6), 065004 (2013) | 10.1103/PhysRevD.88.065004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Current-carrying string-loop dynamics is studied in the Kerr spacetimes. With
attention concentrated to the axisymmetric motion of string loops around
symmetry axis of both black-hole (BH) and naked singularity (NS) spacetimes, it
is shown that the resulting motion is governed by the presence of an outer
tension barr... | [
{
"created": "Thu, 26 Sep 2013 19:46:00 GMT",
"version": "v1"
}
] | 2013-10-01 | [
[
"Kološ",
"M.",
""
],
[
"Stuchlík",
"Z.",
""
]
] | Current-carrying string-loop dynamics is studied in the Kerr spacetimes. With attention concentrated to the axisymmetric motion of string loops around symmetry axis of both black-hole (BH) and naked singularity (NS) spacetimes, it is shown that the resulting motion is governed by the presence of an outer tension barrie... |
gr-qc/9806063 | Plamen Fiziev | P. Fiziev, S. Yazadjiev | Solar-System Experiments and Saa's Model of Gravity with Propagating
Torsion | 4 pages, latex, no figures. Typos corrected | null | null | SU-FzF: 3/98 | gr-qc | null | It's shown that Saa's model of gravity with propagating torsion is
inconsistent with basic solar-system gravitational experiments.
| [
{
"created": "Sun, 14 Jun 1998 07:24:17 GMT",
"version": "v1"
},
{
"created": "Sun, 19 Jul 1998 07:33:38 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Fiziev",
"P.",
""
],
[
"Yazadjiev",
"S.",
""
]
] | It's shown that Saa's model of gravity with propagating torsion is inconsistent with basic solar-system gravitational experiments. |
1012.5110 | Alberto Saa | Cecilia Chirenti and Alberto Saa | Quasinormal modes for the charged Vaidya metric | 4 pages. Prepared for the proceedings of the Spanish Relativity
meeting (ERE2010), Granada, Spain, September 6-10, 2010 | J.Phys.Conf.Ser.314:012086,2011 | 10.1088/1742-6596/314/1/012086 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The scalar wave equation is considered in the background of a charged Vaidya
metric in double null coordinates $(u,v)$ describing a non-stationary charged
black hole with varying mass $m(v)$ and charge $q(v)$. The resulting
time-dependent quasinormal modes are presented and analyzed. We show, in
particular, that it i... | [
{
"created": "Wed, 22 Dec 2010 21:34:19 GMT",
"version": "v1"
}
] | 2011-09-28 | [
[
"Chirenti",
"Cecilia",
""
],
[
"Saa",
"Alberto",
""
]
] | The scalar wave equation is considered in the background of a charged Vaidya metric in double null coordinates $(u,v)$ describing a non-stationary charged black hole with varying mass $m(v)$ and charge $q(v)$. The resulting time-dependent quasinormal modes are presented and analyzed. We show, in particular, that it is ... |
1907.06665 | Andre Landulfo | Andre G. S. Landulfo, Stephen A. Fulling, and George E. A. Matsas | Classical and quantum aspects of the radiation emitted by a uniformly
accelerated charge: Larmor--Unruh reconciliation and zero-frequency Rindler
modes | 7 pages, 1 figure | Phys. Rev. D 100, 045020 (2019) | 10.1103/PhysRevD.100.045020 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The interplay between acceleration and radiation harbors remarkable and
surprising consequences. One of the most striking is that the Larmor radiation
emitted by a charge can be seen as a consequence of the Unruh thermal bath.
Indeed, this connection between the Unruh effect and classical bremsstrahlung
was used rece... | [
{
"created": "Mon, 15 Jul 2019 18:02:03 GMT",
"version": "v1"
}
] | 2019-08-28 | [
[
"Landulfo",
"Andre G. S.",
""
],
[
"Fulling",
"Stephen A.",
""
],
[
"Matsas",
"George E. A.",
""
]
] | The interplay between acceleration and radiation harbors remarkable and surprising consequences. One of the most striking is that the Larmor radiation emitted by a charge can be seen as a consequence of the Unruh thermal bath. Indeed, this connection between the Unruh effect and classical bremsstrahlung was used recent... |
0711.2960 | G. Papini | G. Papini, G. Scarpetta, A. Feoli, G. Lambiase | Optics of spin-1 particles from gravity-induced phases | 16 pages, 2 figures | Int.J.Mod.Phys.D18:485-499,2009 | 10.1142/S0218271809014595 | null | gr-qc | null | The Maxwell and Maxwell-de Rham equations can be solved exactly to first
order in an external gravitational field. The gravitational background induces
phases in the wave functions of spin-1 particles. These phases yield the optics
of the particles without requiring any thin lens approximation.
| [
{
"created": "Mon, 19 Nov 2007 15:48:11 GMT",
"version": "v1"
}
] | 2009-05-12 | [
[
"Papini",
"G.",
""
],
[
"Scarpetta",
"G.",
""
],
[
"Feoli",
"A.",
""
],
[
"Lambiase",
"G.",
""
]
] | The Maxwell and Maxwell-de Rham equations can be solved exactly to first order in an external gravitational field. The gravitational background induces phases in the wave functions of spin-1 particles. These phases yield the optics of the particles without requiring any thin lens approximation. |
gr-qc/0008017 | Mark Miller | Mark Miller | On the Numerical Stability of the Einstein Equations | 14 pages, 9 figures, submitted to Phys. Rev. D | null | null | null | gr-qc | null | We perform a von Neumann stability analysis on a common discretization of the
Einstein equations. The analysis is performed on two formulations of the
Einstein equations, namely, the standard ADM formulation and the
conformal-traceless (CT) formulation. The eigenvalues of the amplification
matrix are computed for fla... | [
{
"created": "Tue, 8 Aug 2000 03:49:30 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Miller",
"Mark",
""
]
] | We perform a von Neumann stability analysis on a common discretization of the Einstein equations. The analysis is performed on two formulations of the Einstein equations, namely, the standard ADM formulation and the conformal-traceless (CT) formulation. The eigenvalues of the amplification matrix are computed for flat ... |
gr-qc/0004038 | Sean A. Hayward | Sean A. Hayward | An extreme critical space-time: echoing and black-hole perturbations | 6 revtex pages, 6 eps figures | Class.Quant.Grav. 17 (2000) 4021-4030 | 10.1088/0264-9381/17/19/304 | null | gr-qc | null | A homothetic, static, spherically symmetric solution to the massless
Einstein- Klein-Gordon equations is described. There is a curvature singularity
which is central, null, bifurcate and marginally trapped. The space-time is
therefore extreme in the sense of lying at the threshold between black holes
and naked singul... | [
{
"created": "Wed, 12 Apr 2000 21:32:14 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Hayward",
"Sean A.",
""
]
] | A homothetic, static, spherically symmetric solution to the massless Einstein- Klein-Gordon equations is described. There is a curvature singularity which is central, null, bifurcate and marginally trapped. The space-time is therefore extreme in the sense of lying at the threshold between black holes and naked singular... |
1604.07173 | Dennis Philipp | Dennis Philipp, Dirk Puetzfeld, Claus Laemmerzahl | On the Applicability of the Geodesic Deviation Equation in General
Relativity | 30 pages, 10 figures; updated version with journal reference | ''Relativistic Geodesy: Foundations and Applications'', D.
Puetzfeld and C. Laemmerzahl (eds.), Fundamental Theories of Physics 196,
pages 419-451, Springer 2019, DOI: 10.1007/978-3-030-11500-5_13, ISBN
978-3-030-11500-5 (online) | 10.1007/978-3-030-11500-5_13 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the theory of General Relativity, we study the solution and range of
applicability of the standard geodesic deviation equation in highly symmetric
spacetimes. In the Schwarzschild spacetime, the solution is used to model
satellite orbit constellations and their deviations around a spherically
symmetric Earth m... | [
{
"created": "Mon, 25 Apr 2016 09:06:12 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Feb 2019 15:46:33 GMT",
"version": "v2"
}
] | 2019-02-20 | [
[
"Philipp",
"Dennis",
""
],
[
"Puetzfeld",
"Dirk",
""
],
[
"Laemmerzahl",
"Claus",
""
]
] | Within the theory of General Relativity, we study the solution and range of applicability of the standard geodesic deviation equation in highly symmetric spacetimes. In the Schwarzschild spacetime, the solution is used to model satellite orbit constellations and their deviations around a spherically symmetric Earth mod... |
1906.05315 | Klaus Liegener Dr | Mehdi Assanioussi, Andrea Dapor, Klaus Liegener, Tomasz Pawlowski | Emergent de Sitter epoch of the Loop Quantum Cosmos: a detailed analysis | 51 pages, 15 figures | Phys. Rev. D 100, 084003 (2019) | 10.1103/PhysRevD.100.084003 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a detailed analysis of a quantum model for Loop Quantum Cosmology
based on strict application of the Thiemann regularization algorithm for the
Hamiltonian in Loop Quantum Gravity, extending the results presented previously
in our brief report. This construction leads to a qualitative modification of
the bo... | [
{
"created": "Wed, 12 Jun 2019 18:09:12 GMT",
"version": "v1"
}
] | 2019-10-09 | [
[
"Assanioussi",
"Mehdi",
""
],
[
"Dapor",
"Andrea",
""
],
[
"Liegener",
"Klaus",
""
],
[
"Pawlowski",
"Tomasz",
""
]
] | We present a detailed analysis of a quantum model for Loop Quantum Cosmology based on strict application of the Thiemann regularization algorithm for the Hamiltonian in Loop Quantum Gravity, extending the results presented previously in our brief report. This construction leads to a qualitative modification of the boun... |
2011.07333 | Giampiero Esposito Dr. | Emmanuele Battista, Giampiero Esposito | What is a reduced boundary in general relativity? | v2: Section 4 is completely new, and important references have been
added. v3: Sub-section 4.1 has been added, with new original calculations.
v4: The figure has been amended | null | 10.1142/S0218271821500504 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The concept of boundary plays an important role in several branches of
general relativity, e.g., the variational principle for the Einstein equations,
the event horizon and the apparent horizon of black holes, the formation of
trapped surfaces. On the other hand, in a branch of mathematics known as
geometric measure ... | [
{
"created": "Sat, 14 Nov 2020 16:45:25 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jan 2021 17:07:57 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Mar 2021 15:41:47 GMT",
"version": "v3"
},
{
"created": "Sat, 13 Mar 2021 19:25:41 GMT",
"version": "v4"
}
] | 2021-03-30 | [
[
"Battista",
"Emmanuele",
""
],
[
"Esposito",
"Giampiero",
""
]
] | The concept of boundary plays an important role in several branches of general relativity, e.g., the variational principle for the Einstein equations, the event horizon and the apparent horizon of black holes, the formation of trapped surfaces. On the other hand, in a branch of mathematics known as geometric measure th... |
2310.19508 | Francisco Lobo | Jos\'e Tarciso S. S. Junior, Francisco S. N. Lobo, Manuel E. Rodrigues | (Regular) Black holes in conformal Killing gravity coupled to nonlinear
electrodynamics and scalar fields | 13 pages, 10 figures. V2: matches published version | Class. Quantum Grav. 41 (2024) 055012 | 10.1088/1361-6382/ad210e | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we explore black hole and regular black hole solutions in the
recently proposed Conformal Killing Gravity (CKG). This theory is of third
order in the derivatives of the metric tensor and essentially satisfies three
theoretical criteria for gravitational theories beyond General Relativity (GR).
The crite... | [
{
"created": "Mon, 30 Oct 2023 13:08:47 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Feb 2024 10:40:49 GMT",
"version": "v2"
}
] | 2024-02-07 | [
[
"Junior",
"José Tarciso S. S.",
""
],
[
"Lobo",
"Francisco S. N.",
""
],
[
"Rodrigues",
"Manuel E.",
""
]
] | In this work, we explore black hole and regular black hole solutions in the recently proposed Conformal Killing Gravity (CKG). This theory is of third order in the derivatives of the metric tensor and essentially satisfies three theoretical criteria for gravitational theories beyond General Relativity (GR). The criteri... |
0805.3575 | Gaston Giribet | Cecilia Garraffo, Gaston Giribet | The Lovelock Black Holes | 42 pages. Discussion on higher-curvature theories substantially
extended | Mod.Phys.Lett.A23:1801-1818,2008 | 10.1142/S0217732308027497 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Lovelock theory is a natural extension of Einstein theory of gravity to
higher dimensions, and it is of great interest in theoretical physics as it
describes a wide class of models. In particular, it describes string theory
inspired ultraviolet corrections to Einstein-Hilbert action, while admits the
Einstein general... | [
{
"created": "Fri, 23 May 2008 05:34:33 GMT",
"version": "v1"
},
{
"created": "Sat, 24 May 2008 04:08:22 GMT",
"version": "v2"
},
{
"created": "Sat, 13 Sep 2008 16:07:52 GMT",
"version": "v3"
},
{
"created": "Wed, 19 Aug 2009 02:51:02 GMT",
"version": "v4"
}
] | 2009-08-19 | [
[
"Garraffo",
"Cecilia",
""
],
[
"Giribet",
"Gaston",
""
]
] | Lovelock theory is a natural extension of Einstein theory of gravity to higher dimensions, and it is of great interest in theoretical physics as it describes a wide class of models. In particular, it describes string theory inspired ultraviolet corrections to Einstein-Hilbert action, while admits the Einstein general r... |
1211.1077 | Bahram Mashhoon | B. Mashhoon | Observers in Spacetime and Nonlocality | 18 pages, accepted for publication in Annalen der Physik; v2: minor
improvements | Annalen Phys.525:235-243, 2013 | 10.1002/andp.201200208 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Characteristics of observers in relativity theory are critically examined.
For field measurements in Minkowski spacetime, the Bohr-Rosenfeld principle
implies that the connection between actual (i.e., noninertial) and inertial
observers must be nonlocal. Nonlocal electrodynamics of non-uniformly rotating
observers is... | [
{
"created": "Mon, 5 Nov 2012 23:41:35 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Mar 2013 22:23:28 GMT",
"version": "v2"
}
] | 2015-06-12 | [
[
"Mashhoon",
"B.",
""
]
] | Characteristics of observers in relativity theory are critically examined. For field measurements in Minkowski spacetime, the Bohr-Rosenfeld principle implies that the connection between actual (i.e., noninertial) and inertial observers must be nonlocal. Nonlocal electrodynamics of non-uniformly rotating observers is d... |
0807.0082 | Remo Garattini | Remo Garattini | Extracting the Maxwell charge from the Wheeler-DeWitt equation | 6 pages. Accepted for publication in Physics Letters B | Phys.Lett.B666:189-192,2008 | 10.1016/j.physletb.2008.06.070 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the Wheeler-De Witt equation as a device for finding eigenvalues
of a Sturm-Liouville problem. In particular, we will focus our attention on the
electric (magnetic) Maxwell charge. In this context, we interpret the Maxwell
charge as an eigenvalue of the Wheeler-De Witt equation generated by the
gravitatio... | [
{
"created": "Tue, 1 Jul 2008 08:26:34 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Garattini",
"Remo",
""
]
] | We consider the Wheeler-De Witt equation as a device for finding eigenvalues of a Sturm-Liouville problem. In particular, we will focus our attention on the electric (magnetic) Maxwell charge. In this context, we interpret the Maxwell charge as an eigenvalue of the Wheeler-De Witt equation generated by the gravitationa... |
1603.04303 | Chandrachur Chakraborty | Chandrachur Chakraborty | Frame-dragging Effect in Strong Gravity Regime | 6 pages, 8 figures, Proceedings of the 28th Texas Symposium on
Relativistic Astrophysics, Geneva, Switzerland, December 13-18, 2015 | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The exact frame-dragging (or Lense-Thirring (LT) precession) rates for Kerr,
Kerr-Taub-NUT (KTN) and Taub-NUT spacetimes have been derived. Remarkably, in
the case of the `zero angular momentum' Taub-NUT spacetime, the frame-dragging
effect is shown not to vanish, when considered for spinning test gyroscope. In
the c... | [
{
"created": "Mon, 14 Mar 2016 15:19:35 GMT",
"version": "v1"
}
] | 2016-03-15 | [
[
"Chakraborty",
"Chandrachur",
""
]
] | The exact frame-dragging (or Lense-Thirring (LT) precession) rates for Kerr, Kerr-Taub-NUT (KTN) and Taub-NUT spacetimes have been derived. Remarkably, in the case of the `zero angular momentum' Taub-NUT spacetime, the frame-dragging effect is shown not to vanish, when considered for spinning test gyroscope. In the cas... |
2302.12512 | Shuxun Tian | S. X. Tian | Cosmological consequences of a scalar field with oscillating equation of
state. IV. Primordial nucleosynthesis and the deuterium problem | 14 pages, 4 figures, published in Phys. Rev. D | Phys. Rev. D 106, 043524 (2022) | 10.1103/PhysRevD.106.043524 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study the primordial nucleosynthesis (BBN) in the stepwise scalar field
model proposed by Ti\'an [arXiv:1912.13208, Phys. Rev. D 101, 063531 (2020)],
which provides a multiaccelerating Universe solution to the cosmological
coincidence problem and predicts that the scalar field may be non-negligible
even in the ear... | [
{
"created": "Fri, 24 Feb 2023 08:51:34 GMT",
"version": "v1"
}
] | 2023-02-27 | [
[
"Tian",
"S. X.",
""
]
] | We study the primordial nucleosynthesis (BBN) in the stepwise scalar field model proposed by Ti\'an [arXiv:1912.13208, Phys. Rev. D 101, 063531 (2020)], which provides a multiaccelerating Universe solution to the cosmological coincidence problem and predicts that the scalar field may be non-negligible even in the early... |
1108.4579 | Diana Kaminski | Diana Kaminski | AQV III. The holonomy-flux cross-product C*-algebra | 49 pages, 4 figures | null | null | null | gr-qc math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article a new C*-algebra derived from the basic quantum variables:
holonomies along paths and group-valued quantum flux operators in the framework
of Loop Quantum Gravity is constructed. This development is based on the theory
of cross-products and C*-dynamical systems. The author has presented a set of
actio... | [
{
"created": "Fri, 19 Aug 2011 16:52:56 GMT",
"version": "v1"
}
] | 2011-08-24 | [
[
"Kaminski",
"Diana",
""
]
] | In this article a new C*-algebra derived from the basic quantum variables: holonomies along paths and group-valued quantum flux operators in the framework of Loop Quantum Gravity is constructed. This development is based on the theory of cross-products and C*-dynamical systems. The author has presented a set of actions... |
gr-qc/9210016 | Wai Suen | Edward Seidel and Wai-Mo Suen | Towards a Singularity-Proof Scheme in Numerical Relativity | 9 pages | Phys.Rev.Lett.69:1845-1848,1992 | 10.1103/PhysRevLett.69.1845 | WUGRAV-92-11 | gr-qc | null | Progress in numerical relativity has been hindered for 30 years because of
the difficulties of avoiding spacetime singularities in numerical evolution. We
propose a scheme which excises a region inside an apparent horizon containing
the singularity. Two major ingredients of the scheme are the use of a
horizon-locking... | [
{
"created": "Wed, 28 Oct 1992 23:10:42 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Seidel",
"Edward",
""
],
[
"Suen",
"Wai-Mo",
""
]
] | Progress in numerical relativity has been hindered for 30 years because of the difficulties of avoiding spacetime singularities in numerical evolution. We propose a scheme which excises a region inside an apparent horizon containing the singularity. Two major ingredients of the scheme are the use of a horizon-locking c... |
1604.05306 | Farzana Kousar | M. Zubair and Farzana Kousar | Cosmological reconstruction and energy bounds in $f(R,R_{\alpha
\beta}R^{\alpha\beta},\phi)$ gravity | 27 pages, 3 figures | Eur. Phys. J. C (2016) 76: 254 | 10.1140/epjc/s10052-016-4104-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the cosmological reconstruction of
$f(R,R_{\alpha\beta}R^{\alpha\beta},\phi)$ (where $R$,
$R_{\alpha\beta}R^{\alpha\beta}$ and $\phi$ represents the Ricci scalar, Ricci
invariant and scalar field) corresponding to power law and de Sitter evolution
in the framework of FRW universe model. We derive the energ... | [
{
"created": "Mon, 18 Apr 2016 11:34:16 GMT",
"version": "v1"
}
] | 2017-05-01 | [
[
"Zubair",
"M.",
""
],
[
"Kousar",
"Farzana",
""
]
] | We discuss the cosmological reconstruction of $f(R,R_{\alpha\beta}R^{\alpha\beta},\phi)$ (where $R$, $R_{\alpha\beta}R^{\alpha\beta}$ and $\phi$ represents the Ricci scalar, Ricci invariant and scalar field) corresponding to power law and de Sitter evolution in the framework of FRW universe model. We derive the energy ... |
1712.07345 | Huan Yang | Haixing Miao, Huan Yang, Denis Martynov | Towards the Design of Gravitational-Wave Detectors for Probing
Neutron-Star Physics | 14 pages, 15 figures, published version | Phys. Rev. D 98, 044044 (2018) | 10.1103/PhysRevD.98.044044 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitational waveform of merging binary neutron stars encodes
information about extreme states of matter. Probing these gravitational
emissions requires the gravitational-wave detectors to have high sensitivity
above 1 kHz. Fortunately for current advanced detectors, there is a sizeable
gap between the quantum-l... | [
{
"created": "Wed, 20 Dec 2017 07:31:29 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Aug 2018 15:35:21 GMT",
"version": "v2"
}
] | 2018-09-12 | [
[
"Miao",
"Haixing",
""
],
[
"Yang",
"Huan",
""
],
[
"Martynov",
"Denis",
""
]
] | The gravitational waveform of merging binary neutron stars encodes information about extreme states of matter. Probing these gravitational emissions requires the gravitational-wave detectors to have high sensitivity above 1 kHz. Fortunately for current advanced detectors, there is a sizeable gap between the quantum-lim... |
2302.08518 | Adrien Kuntz | Adrien Kuntz | A supplementary radiation-reaction force between two binaries | Version accepted for publication in PRD | null | 10.1103/PhysRevD.107.064066 | null | gr-qc astro-ph.HE astro-ph.SR hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Radiation-reaction forces originating from the emission of gravitational
waves (GW) bring binaries to close proximity and are thus responsible for
virtually all the mergers that we can observe in GW interferometers. We show
that there exists a supplementary radiation-reaction force between two binaries
interacting gr... | [
{
"created": "Thu, 16 Feb 2023 19:00:01 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Mar 2023 17:41:30 GMT",
"version": "v2"
}
] | 2023-03-29 | [
[
"Kuntz",
"Adrien",
""
]
] | Radiation-reaction forces originating from the emission of gravitational waves (GW) bring binaries to close proximity and are thus responsible for virtually all the mergers that we can observe in GW interferometers. We show that there exists a supplementary radiation-reaction force between two binaries interacting grav... |
2405.04608 | Peter K.F. Kuhfittig | Peter K.F. Kuhfittig | Revisiting the boundary conditions for a Morris-Thorne wormhole | 10 pages, no figures. arXiv admin note: text overlap with
arXiv:2312.08392 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In physical science, the concept of \emph{emergence} is often used to
describe phenomena that occur at macroscopic scales but not at microscopic
scales. The latter is usually referred to as a \emph{fundamental property} and
the former as an \emph{emergent property}. In this paper, noncommutative
geometry, often viewe... | [
{
"created": "Tue, 7 May 2024 18:43:16 GMT",
"version": "v1"
}
] | 2024-05-09 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | In physical science, the concept of \emph{emergence} is often used to describe phenomena that occur at macroscopic scales but not at microscopic scales. The latter is usually referred to as a \emph{fundamental property} and the former as an \emph{emergent property}. In this paper, noncommutative geometry, often viewed ... |
1206.2122 | Irina Dymnikova | Irina Dymnikova | Triple-horizon spherically symmetric spacetime and holographic principle | Honorable Mentioned Essay - Gravity Research Foundation 2012;
submitted to Int. J. Mod. Phys. D | null | 10.1142/S0218271812420072 | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a family of spherically symmetric spacetimes, specified by the
density profile of a vacuum dark energy, which have the same global structure
as the de Sitter spacetime but the reduced symmetry which leads to a
time-evolving and spatially inhomogeneous cosmological term. It connects
smoothly two de Sitter v... | [
{
"created": "Mon, 11 Jun 2012 08:25:27 GMT",
"version": "v1"
}
] | 2015-06-05 | [
[
"Dymnikova",
"Irina",
""
]
] | We present a family of spherically symmetric spacetimes, specified by the density profile of a vacuum dark energy, which have the same global structure as the de Sitter spacetime but the reduced symmetry which leads to a time-evolving and spatially inhomogeneous cosmological term. It connects smoothly two de Sitter vac... |
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