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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2005.07260 | Mauricio Bellini | Mauricio Bellini (IFIMAR - CONICET & UNMdP) | Quantum magnetic monopoles at the Planck era from unified spinor fields | Published in Phys. Dark Univ | Phys. Dark Univ. 30: 100693 (2020) | 10.1016/j.dark.2020.100693 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I use Unified Spinor Fields (USF), to discuss the creation of magnetic
monopoles during preinflation, as excitations of the quantum vacuum coming from
a condensate of massive charged vector bosons. For a primordial universe with
total energy $M_p$, and for magnetic monopoles created with a total Planck
magnetic charg... | [
{
"created": "Thu, 14 May 2020 21:10:45 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Jun 2020 13:44:51 GMT",
"version": "v2"
},
{
"created": "Sun, 2 Aug 2020 13:20:09 GMT",
"version": "v3"
}
] | 2020-08-04 | [
[
"Bellini",
"Mauricio",
"",
"IFIMAR - CONICET & UNMdP"
]
] | I use Unified Spinor Fields (USF), to discuss the creation of magnetic monopoles during preinflation, as excitations of the quantum vacuum coming from a condensate of massive charged vector bosons. For a primordial universe with total energy $M_p$, and for magnetic monopoles created with a total Planck magnetic charge ... |
2201.12317 | Alex Pandya | Alex Pandya, Elias R. Most, and Frans Pretorius | Conservative finite volume scheme for first-order viscous relativistic
hydrodynamics | 24 pages, 9 figures; updated to match published version | null | 10.1103/PhysRevD.105.123001 | null | gr-qc astro-ph.HE nucl-th physics.comp-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the first conservative finite volume numerical scheme for the
causal, stable relativistic Navier-Stokes equations developed by Bemfica,
Disconzi, Noronha, and Kovtun (BDNK). BDNK theory has arisen very recently as a
promising means of incorporating entropy-generating effects (viscosity, heat
conduction) in... | [
{
"created": "Fri, 28 Jan 2022 18:30:38 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Feb 2022 01:01:54 GMT",
"version": "v2"
},
{
"created": "Thu, 2 Jun 2022 01:21:18 GMT",
"version": "v3"
}
] | 2022-06-15 | [
[
"Pandya",
"Alex",
""
],
[
"Most",
"Elias R.",
""
],
[
"Pretorius",
"Frans",
""
]
] | We present the first conservative finite volume numerical scheme for the causal, stable relativistic Navier-Stokes equations developed by Bemfica, Disconzi, Noronha, and Kovtun (BDNK). BDNK theory has arisen very recently as a promising means of incorporating entropy-generating effects (viscosity, heat conduction) into... |
gr-qc/0612020 | Alexei Zayats | Alexander B. Balakin, Alexei E. Zayats | Curvature coupling in Einstein-Yang-Mills theory and non-minimal
self-duality | 6 pages, no figures, accepted for publication in Gravitation and
Cosmology | Grav.Cosmol.12:302-306,2006 | null | null | gr-qc astro-ph hep-ph hep-th | null | A self-consistent non-minimal non-Abelian Einstein-Yang-Mills model,
containing three phenomenological coupling constants, is formulated. The ansatz
of a vanishing Yang-Mills induction is considered as a particular case of the
self-duality requirement for the gauge field. Such an ansatz is shown to allow
obtaining an... | [
{
"created": "Sun, 3 Dec 2006 12:23:18 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Dec 2006 13:54:32 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Balakin",
"Alexander B.",
""
],
[
"Zayats",
"Alexei E.",
""
]
] | A self-consistent non-minimal non-Abelian Einstein-Yang-Mills model, containing three phenomenological coupling constants, is formulated. The ansatz of a vanishing Yang-Mills induction is considered as a particular case of the self-duality requirement for the gauge field. Such an ansatz is shown to allow obtaining an e... |
1606.06627 | Jeremy Sakstein | Eugeny Babichev, Kazuya Koyama, David Langlois, Ryo Saito, Jeremy
Sakstein | Relativistic Stars in Beyond Horndeski Theories | 13 pages, five figures. Updated to reflect published version. Results
unchanged but added plots for positive Upsilon | 2016 Class. Quantum Grav. 33 235014 | 10.1088/0264-9381/33/23/235014 | YITP-16-76, LPT-Orsay-16-46 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work studies relativistic stars in beyond Horndeski scalar-tensor
theories that exhibit a breaking of the Vainshtein mechanism inside matter,
focusing on a model based on the quartic beyond Horndeski Lagrangian. We
self-consistently derive the scalar field profile for static spherically
symmetric objects in asym... | [
{
"created": "Tue, 21 Jun 2016 15:51:53 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Oct 2016 16:05:12 GMT",
"version": "v2"
},
{
"created": "Tue, 8 Nov 2016 14:14:30 GMT",
"version": "v3"
}
] | 2016-11-16 | [
[
"Babichev",
"Eugeny",
""
],
[
"Koyama",
"Kazuya",
""
],
[
"Langlois",
"David",
""
],
[
"Saito",
"Ryo",
""
],
[
"Sakstein",
"Jeremy",
""
]
] | This work studies relativistic stars in beyond Horndeski scalar-tensor theories that exhibit a breaking of the Vainshtein mechanism inside matter, focusing on a model based on the quartic beyond Horndeski Lagrangian. We self-consistently derive the scalar field profile for static spherically symmetric objects in asympt... |
1206.5341 | Luis P. Chimento | Mario Castagnino and Luis Chimento | Two Theorems on Flat Space-Time Gravitational Theories | 11 pages | General Relativity and Gravitation, Vol. 12, No. 10, 825, 1980 | 10.1007/BF00763058 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The first theorem states that all flat space-time gravitational theories must
have a Lagrangian with a first term that is an homogeneous (degree-I) function
of the 4-velocity $u^i$, plus a functional of $\eta_{ij}u^i u^j$. The second
theorem states that all gravitational theories that satisfy the strong
equivalence p... | [
{
"created": "Sat, 23 Jun 2012 00:00:17 GMT",
"version": "v1"
}
] | 2015-06-05 | [
[
"Castagnino",
"Mario",
""
],
[
"Chimento",
"Luis",
""
]
] | The first theorem states that all flat space-time gravitational theories must have a Lagrangian with a first term that is an homogeneous (degree-I) function of the 4-velocity $u^i$, plus a functional of $\eta_{ij}u^i u^j$. The second theorem states that all gravitational theories that satisfy the strong equivalence pri... |
1408.4635 | Jorge Pullin | Rodolfo Gambini and Jorge Pullin | Quantum shells in a quantum space-time | 5 pages, 3 figures | null | 10.1088/0264-9381/32/3/035003 | LSU-REL-082014 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the quantum motion of null shells in the quantum space-time of a
black hole in loop quantum gravity. We treat the shells as test fields and use
an effective dynamics for the propagation equations. The shells propagate
through the region where the singularity was present in the classical black
hole space-time... | [
{
"created": "Wed, 20 Aug 2014 12:54:10 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Gambini",
"Rodolfo",
""
],
[
"Pullin",
"Jorge",
""
]
] | We study the quantum motion of null shells in the quantum space-time of a black hole in loop quantum gravity. We treat the shells as test fields and use an effective dynamics for the propagation equations. The shells propagate through the region where the singularity was present in the classical black hole space-time, ... |
1702.00909 | Hee-Suk Cho | Hee-Suk Cho | Systematic Bias Due to Nonspinning Template Waveforms in the
Gravitational Wave Parameter Estimation for Aligned-Spin Binary Black Holes | 5 pages, 2 figures, updated to match published version | JKPS 70, 735 (2017) | 10.3938/jkps.70.735 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the parameter estimation of gravitational waves for aligned-spin
binary black hole (BBH) signals and assess the impact of bias that can be
produced by using nonspinning template waveforms. We employ simple methods to
calculate the statistical uncertainty from an overlap distribution. For the
fiducial wavefor... | [
{
"created": "Fri, 3 Feb 2017 05:33:19 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Apr 2017 04:14:21 GMT",
"version": "v2"
}
] | 2017-04-12 | [
[
"Cho",
"Hee-Suk",
""
]
] | We study the parameter estimation of gravitational waves for aligned-spin binary black hole (BBH) signals and assess the impact of bias that can be produced by using nonspinning template waveforms. We employ simple methods to calculate the statistical uncertainty from an overlap distribution. For the fiducial waveform ... |
2110.07056 | D. Ghilencea | D. M. Ghilencea, T. Harko | Cosmological evolution in Weyl conformal geometry | 23 pages, LaTeX, 4 figures | null | null | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the cosmological evolution of the Weyl conformal geometry and its
associated Weyl quadratic gravity. The Einstein gravity (with a positive
cosmological constant) is recovered in the spontaneously broken phase of Weyl
gravity; this happens after the Weyl gauge field ($\omega_\mu$) of scale
symmetry, that is... | [
{
"created": "Wed, 13 Oct 2021 22:16:45 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Jun 2022 22:29:01 GMT",
"version": "v2"
}
] | 2022-06-24 | [
[
"Ghilencea",
"D. M.",
""
],
[
"Harko",
"T.",
""
]
] | We discuss the cosmological evolution of the Weyl conformal geometry and its associated Weyl quadratic gravity. The Einstein gravity (with a positive cosmological constant) is recovered in the spontaneously broken phase of Weyl gravity; this happens after the Weyl gauge field ($\omega_\mu$) of scale symmetry, that is p... |
gr-qc/0306034 | Konstantina Savvidou | Ntina Savvidou | General relativity histories theory I: The spacetime character of the
canonical description | 23 pages, submitted to Class. Quant. Grav | Class.Quant.Grav. 21 (2004) 615 | 10.1088/0264-9381/21/2/020 | IMPERIAL/TP/2-03/16 | gr-qc hep-th math-ph math.MP quant-ph | null | The problem of time in canonical quantum gravity is related to the fact that
the canonical description is based on the prior choice of a spacelike
foliation, hence making a reference to a spacetime metric. However, the metric
is expected to be a dynamical, fluctuating quantity in quantum gravity. We show
how this pro... | [
{
"created": "Mon, 9 Jun 2003 15:26:50 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Savvidou",
"Ntina",
""
]
] | The problem of time in canonical quantum gravity is related to the fact that the canonical description is based on the prior choice of a spacelike foliation, hence making a reference to a spacetime metric. However, the metric is expected to be a dynamical, fluctuating quantity in quantum gravity. We show how this probl... |
0810.5039 | Marco Valerio Battisti | Marco Valerio Battisti | Deformed spaces and loop cosmology | 5 pages, talk given at NEB-XIII Recent Developments in Gravity,
Thessaloniki June 2008 | J.Phys.Conf.Ser.189:012005,2009 | 10.1088/1742-6596/189/1/012005 | null | gr-qc | http://creativecommons.org/licenses/by/3.0/ | The non-singular bouncing solution of loop quantum cosmology is reproduced by
a deformed minisuperspace Heisenberg algebra. This algebra is a realization of
the Snyder space, is almost unique and is related to the $\kappa$-Poincar\'e
one. Since the sign of the deformation parameter it is not fixed, the Friedmann
equa... | [
{
"created": "Tue, 28 Oct 2008 14:35:20 GMT",
"version": "v1"
}
] | 2009-11-05 | [
[
"Battisti",
"Marco Valerio",
""
]
] | The non-singular bouncing solution of loop quantum cosmology is reproduced by a deformed minisuperspace Heisenberg algebra. This algebra is a realization of the Snyder space, is almost unique and is related to the $\kappa$-Poincar\'e one. Since the sign of the deformation parameter it is not fixed, the Friedmann equati... |
2202.12463 | Pedro Mario Ca\~nate Casseres | Pedro Ca\~nate, F. H. Maldonado-Villamizar | Novel traversable wormhole in General Relativity and
Einstein-Scalar-Gauss-Bonnet theory supported by nonlinear electrodynamics | 22 pages, 4 figures | null | 10.1103/PhysRevD.106.044063 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several traversable wormholes (T-WHs) of the Morris-Thorne type have been
presented as exact solutions of Einstein-nonlinear electrodynamics gravity
(GR-NLED), e.g. \cite{Arellano2009, Bronnikov2018,Bronnikov_Walia2021,
Canate_Breton2018, Canate_Breton_Ortiz2020, Canate_Magos_Breton2020}. However,
none of these solut... | [
{
"created": "Fri, 25 Feb 2022 02:34:53 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Aug 2022 21:26:10 GMT",
"version": "v2"
}
] | 2022-09-07 | [
[
"Cañate",
"Pedro",
""
],
[
"Maldonado-Villamizar",
"F. H.",
""
]
] | Several traversable wormholes (T-WHs) of the Morris-Thorne type have been presented as exact solutions of Einstein-nonlinear electrodynamics gravity (GR-NLED), e.g. \cite{Arellano2009, Bronnikov2018,Bronnikov_Walia2021, Canate_Breton2018, Canate_Breton_Ortiz2020, Canate_Magos_Breton2020}. However, none of these solutio... |
1912.06143 | Axel Polaczek | Steffen Gielen, Axel Polaczek | Generalised effective cosmology from group field theory | 38 pages, 5 figures; v2: improved discussion, added references,
additional figure | Class. Quantum Grav. 37 (2020), 165004 | 10.1088/1361-6382/ab8f67 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend various recent results regarding the derivation of effective
cosmological Friedmann equations from the dynamics of group field theory (GFT).
Restricting ourselves to a single GFT field mode (or fixed values of Peter-Weyl
representation labels), we first consider dynamics given by a quadratic
Hamiltonian, wh... | [
{
"created": "Thu, 12 Dec 2019 19:00:01 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Jun 2020 07:18:24 GMT",
"version": "v2"
}
] | 2022-01-11 | [
[
"Gielen",
"Steffen",
""
],
[
"Polaczek",
"Axel",
""
]
] | We extend various recent results regarding the derivation of effective cosmological Friedmann equations from the dynamics of group field theory (GFT). Restricting ourselves to a single GFT field mode (or fixed values of Peter-Weyl representation labels), we first consider dynamics given by a quadratic Hamiltonian, whic... |
2008.11396 | Jian-dong Zhang | Miaoxin Liu, Jian-dong Zhang | Augmented analytic kludge waveform with quadrupole moment correction | 9 pages, 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the most important sources for future space-borne gravitational wave
detectors such as TianQin and LISA is EMRI. It happens when a stellar orgin
compact object orbiting around a massive black hole(MBH) in the center of
galaxies and has many benefits in the study of astrophysics and fundamental
theories. One of... | [
{
"created": "Wed, 26 Aug 2020 06:29:56 GMT",
"version": "v1"
}
] | 2020-08-27 | [
[
"Liu",
"Miaoxin",
""
],
[
"Zhang",
"Jian-dong",
""
]
] | One of the most important sources for future space-borne gravitational wave detectors such as TianQin and LISA is EMRI. It happens when a stellar orgin compact object orbiting around a massive black hole(MBH) in the center of galaxies and has many benefits in the study of astrophysics and fundamental theories. One of t... |
1601.05809 | Benjamin Koch | Crist\'obal Armaza, Sergio A. Hojman, Benjamin Koch, and Nicol\'as
Zalaquett | On the Possibility of Non-Geodesic Motion of the Massless Spinning Top | 16 pages, no figures | null | 10.1088/0264-9381/33/14/145011 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The motion of spinning massless particles in gravitationally curved
backgrounds is revisited by considering new types of constraints. Those
constraints guarantee zero mass ($P_\mu P^\mu=0$) and they allow for the
possibility of trajectories which are not simply null geodesics. To exemplify
this previously unknown pos... | [
{
"created": "Thu, 21 Jan 2016 21:00:39 GMT",
"version": "v1"
}
] | 2016-07-06 | [
[
"Armaza",
"Cristóbal",
""
],
[
"Hojman",
"Sergio A.",
""
],
[
"Koch",
"Benjamin",
""
],
[
"Zalaquett",
"Nicolás",
""
]
] | The motion of spinning massless particles in gravitationally curved backgrounds is revisited by considering new types of constraints. Those constraints guarantee zero mass ($P_\mu P^\mu=0$) and they allow for the possibility of trajectories which are not simply null geodesics. To exemplify this previously unknown possi... |
1806.09516 | Robert \v{S}varc | Robert Svarc, Jiri Podolsky, Vojtech Pravda, Alena Pravdova | Exact black holes in quadratic gravity with any cosmological constant | 6 pages, 3 figures: accepted for publication in Physical Review
Letters | Phys. Rev. Lett. 121, 231104 (2018) | 10.1103/PhysRevLett.121.231104 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new explicit class of black holes in general quadratic gravity
with a cosmological constant. These spherically symmetric
Schwarzschild-Bach-(anti-)de Sitter geometries (Schwa-Bach-(A)dS), derived
under the assumption of constant scalar curvature, form a three-parameter
family determined by the black-hole... | [
{
"created": "Mon, 25 Jun 2018 15:04:17 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Nov 2018 14:33:34 GMT",
"version": "v2"
}
] | 2018-12-10 | [
[
"Svarc",
"Robert",
""
],
[
"Podolsky",
"Jiri",
""
],
[
"Pravda",
"Vojtech",
""
],
[
"Pravdova",
"Alena",
""
]
] | We present a new explicit class of black holes in general quadratic gravity with a cosmological constant. These spherically symmetric Schwarzschild-Bach-(anti-)de Sitter geometries (Schwa-Bach-(A)dS), derived under the assumption of constant scalar curvature, form a three-parameter family determined by the black-hole h... |
1201.3840 | Bianca Dittrich | Bianca Dittrich | How to construct diffeomorphism symmetry on the lattice | 21 pages, to appear in the Proceedings of the 3rd Quantum Gravity and
Quantum Geometry School 2011, Zakopane, Poland | null | null | null | gr-qc hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Diffeomorphism symmetry, the fundamental invariance of general relativity, is
generically broken under discretization. After discussing the meaning and
implications of diffeomorphism symmetry in the discrete, in particular for the
continuum limit, we introduce a perturbative framework to construct
discretizations wit... | [
{
"created": "Wed, 18 Jan 2012 16:37:03 GMT",
"version": "v1"
}
] | 2012-01-19 | [
[
"Dittrich",
"Bianca",
""
]
] | Diffeomorphism symmetry, the fundamental invariance of general relativity, is generically broken under discretization. After discussing the meaning and implications of diffeomorphism symmetry in the discrete, in particular for the continuum limit, we introduce a perturbative framework to construct discretizations with ... |
1604.05638 | David Kofro\v{n} | David Kofro\v{n} | Separability of test fields equations on the C-metric background II.
Rotating case and the Meissner effect | 6 pages, accepted for publication in Physical Review D | Phys. Rev. D 93, 104012 (2016) | 10.1103/PhysRevD.93.104012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the separation of the Teukolsky master equation for the test field
of arbitrary spin on the background of the rotating C-metric. We also summarize
and simplify some known results about Debye potentials of these fields on type
D background. The equation for the Debye potential is also separated.
Solving f... | [
{
"created": "Tue, 19 Apr 2016 16:25:22 GMT",
"version": "v1"
}
] | 2020-03-25 | [
[
"Kofroň",
"David",
""
]
] | We present the separation of the Teukolsky master equation for the test field of arbitrary spin on the background of the rotating C-metric. We also summarize and simplify some known results about Debye potentials of these fields on type D background. The equation for the Debye potential is also separated. Solving for t... |
gr-qc/0207018 | Jorge Pullin | Gioel Calabrese, Jorge Pullin, Olivier Sarbach, Manuel Tiglio | Convergence and stability in numerical relativity | 5 pages, RevTex, 4 figures | Phys.Rev. D66 (2002) 041501 | 10.1103/PhysRevD.66.041501 | LSU-REL-070202 | gr-qc | null | It is often the case in numerical relativity that schemes that are known to
be convergent for well posed systems are used in evolutions of weakly
hyperbolic (WH) formulations of Einstein's equations. Here we explicitly show
that with several of the discretizations that have been used through out the
years, this proce... | [
{
"created": "Tue, 2 Jul 2002 18:08:41 GMT",
"version": "v1"
}
] | 2016-08-16 | [
[
"Calabrese",
"Gioel",
""
],
[
"Pullin",
"Jorge",
""
],
[
"Sarbach",
"Olivier",
""
],
[
"Tiglio",
"Manuel",
""
]
] | It is often the case in numerical relativity that schemes that are known to be convergent for well posed systems are used in evolutions of weakly hyperbolic (WH) formulations of Einstein's equations. Here we explicitly show that with several of the discretizations that have been used through out the years, this procedu... |
gr-qc/0703059 | S. Mignemi | S. Mignemi | Asymptotic properties of black hole solutions in dimensionally reduced
Einstein-Gauss-Bonnet gravity | 9 pages, plain TeX | Gen.Rel.Grav.39:815-824,2007 | 10.1007/s10714-007-0423-5 | null | gr-qc | null | We study the asymptotic behavior of the spherically symmetric solutions of
the system obtained from the dimensional reduction of the six-dimensional
Einstein- Gauss-Bonnet action. We show that in general the scalar field that
parametrizes the size of the internal space is not trivial, but nevertheless
the solutions d... | [
{
"created": "Thu, 8 Mar 2007 17:00:06 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Mignemi",
"S.",
""
]
] | We study the asymptotic behavior of the spherically symmetric solutions of the system obtained from the dimensional reduction of the six-dimensional Einstein- Gauss-Bonnet action. We show that in general the scalar field that parametrizes the size of the internal space is not trivial, but nevertheless the solutions dep... |
gr-qc/9706013 | Alexander L. Gromov | Alexander Gromov (St-Petersburg State Thechnical University, Russia) | Singularities and asymptotic behavior of the Tolman-Bondi model | LaTeX, pages,; submitted to International Journal of Theoretical
Physics | null | null | IRB-StP-GR-050797 | gr-qc | null | The Bondi formula for calculation of the invariant mass in the Tolman- Bondi
(TB) model is interprated as a transformation rule on the set of co-moving
coordinates. The general procedure by which the three arbitrary functions of
the TB model are determined explicitly is presented. The properties of the TB
model, prod... | [
{
"created": "Wed, 4 Jun 1997 13:46:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gromov",
"Alexander",
"",
"St-Petersburg State Thechnical University, Russia"
]
] | The Bondi formula for calculation of the invariant mass in the Tolman- Bondi (TB) model is interprated as a transformation rule on the set of co-moving coordinates. The general procedure by which the three arbitrary functions of the TB model are determined explicitly is presented. The properties of the TB model, produc... |
2105.09997 | Tony Rothman | Tony Rothman | Addendum to "Hasen\"ohrl and the Equivalence of Mass and Energy" | 4 pages, 1 figure | null | null | null | gr-qc physics.hist-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This addendum addresses several objections regarding accelerating cavities in
the paper by Boughn and Rothman, "Hasen\"ohrl and the Equivalence of Mass and
Energy," arXiv:1108.2250.
| [
{
"created": "Thu, 20 May 2021 19:16:11 GMT",
"version": "v1"
}
] | 2021-05-24 | [
[
"Rothman",
"Tony",
""
]
] | This addendum addresses several objections regarding accelerating cavities in the paper by Boughn and Rothman, "Hasen\"ohrl and the Equivalence of Mass and Energy," arXiv:1108.2250. |
gr-qc/9602062 | Marco Cavaglia | Marco Cavaglia` and Vittorio de Alfaro | Quantization of a 2D Minisuperspace Model in Dilaton-Einstein Gravity | 10 pages, plain tex, no figures | Int.J.Mod.Phys. D6 (1997) 39-48 | 10.1142/S0218271897000030 | DFTT 10/96 | gr-qc | null | We investigate a minisuperspace model of Einstein gravity plus dilaton that
describes a static spherically symmetric configuration or a Kantowski - Sachs
like universe. We develop the canonical formalism and identify canonical
quantities that generate rigid symmetries of the Hamiltonian. Quantization is
performed by ... | [
{
"created": "Thu, 29 Feb 1996 15:14:43 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Cavaglia`",
"Marco",
""
],
[
"de Alfaro",
"Vittorio",
""
]
] | We investigate a minisuperspace model of Einstein gravity plus dilaton that describes a static spherically symmetric configuration or a Kantowski - Sachs like universe. We develop the canonical formalism and identify canonical quantities that generate rigid symmetries of the Hamiltonian. Quantization is performed by th... |
1907.13209 | Robert Bluhm | Robert Bluhm, Hannah Bossi, and Yuewei Wen | Gravity with explicit spacetime symmetry breaking and the Standard-Model
Extension | Published version | Phys. Rev. D 100, 084022 (2019) | 10.1103/PhysRevD.100.084022 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Standard-Model Extension (SME) is the general phenomenological framework
used to investigate Lorentz violation at the level of effective field theory.
It has been used to obtain stringent experimental bounds on Lorentz violation
in a wide range of tests. In the gravity sector of the SME, it is typically
assumed t... | [
{
"created": "Tue, 30 Jul 2019 20:12:27 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Oct 2019 14:01:21 GMT",
"version": "v2"
}
] | 2019-10-16 | [
[
"Bluhm",
"Robert",
""
],
[
"Bossi",
"Hannah",
""
],
[
"Wen",
"Yuewei",
""
]
] | The Standard-Model Extension (SME) is the general phenomenological framework used to investigate Lorentz violation at the level of effective field theory. It has been used to obtain stringent experimental bounds on Lorentz violation in a wide range of tests. In the gravity sector of the SME, it is typically assumed tha... |
0906.3818 | Marcello Ortaggio | Marcello Ortaggio | Bel-Debever criteria for the classification of the Weyl tensors in
higher dimensions | 8 pages | Class.Quant.Grav.26:195015,2009 | 10.1088/0264-9381/26/19/195015 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An extension to higher dimensions of the Bel-Debever characterization of the
Weyl tensor is considered. This provides algebraic conditions that uniquely
determine the multiplicity of a Weyl aligned null direction (WAND), and thus
the principal Weyl type, in a frame independent way. The specification of
several "subty... | [
{
"created": "Sat, 20 Jun 2009 17:02:57 GMT",
"version": "v1"
}
] | 2009-10-02 | [
[
"Ortaggio",
"Marcello",
""
]
] | An extension to higher dimensions of the Bel-Debever characterization of the Weyl tensor is considered. This provides algebraic conditions that uniquely determine the multiplicity of a Weyl aligned null direction (WAND), and thus the principal Weyl type, in a frame independent way. The specification of several "subtype... |
1406.2253 | Jan Harms | Jan Harms, Stefan Hild | Passive Newtonian noise suppression for gravitational-wave observatories
based on shaping of the local topography | 12 pages, 5 figures | null | 10.1088/0264-9381/31/18/185011 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we propose a new method for reducing Newtonian noise in
laser-interferometric gravitational-wave detectors located on the Earth's
surface. We show that by excavating meter-scale recesses in the ground around
the main test masses of a gravitational wave detector it is possible to reduce
the coupling of... | [
{
"created": "Mon, 9 Jun 2014 17:37:31 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Harms",
"Jan",
""
],
[
"Hild",
"Stefan",
""
]
] | In this article we propose a new method for reducing Newtonian noise in laser-interferometric gravitational-wave detectors located on the Earth's surface. We show that by excavating meter-scale recesses in the ground around the main test masses of a gravitational wave detector it is possible to reduce the coupling of R... |
1607.01420 | Noah Sennett | Noah Sennett, Sylvain Marsat and Alessandra Buonanno | Gravitational waveforms in scalar-tensor gravity at 2PN relative order | 23 pages | Phys. Rev. D 94, 084003 (2016) | 10.1103/PhysRevD.94.084003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the gravitational waveform from a binary system in scalar-tensor
gravity at 2PN relative order. We restrict our calculation to non-spinning
binary systems on quasi-circular orbits and compute the spin-weighted spherical
modes of the radiation. The evolution of the phase of the waveform is computed
in the t... | [
{
"created": "Tue, 5 Jul 2016 21:20:09 GMT",
"version": "v1"
}
] | 2017-10-11 | [
[
"Sennett",
"Noah",
""
],
[
"Marsat",
"Sylvain",
""
],
[
"Buonanno",
"Alessandra",
""
]
] | We compute the gravitational waveform from a binary system in scalar-tensor gravity at 2PN relative order. We restrict our calculation to non-spinning binary systems on quasi-circular orbits and compute the spin-weighted spherical modes of the radiation. The evolution of the phase of the waveform is computed in the tim... |
0807.1043 | Donald Neville | Donald E. Neville | On the Classical Limit of Spin Network Gravity: Two Conjectures | 9 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Estimates are given of the time scales which govern spreading of a coherent
state wave packet. The estimates, based on dimensional analysis, suggest that
spreading should be small for coherent states with average angular momentum of
order 100 or larger. It is conjectured that in the classical limit, terms in
the Hami... | [
{
"created": "Mon, 7 Jul 2008 15:32:50 GMT",
"version": "v1"
}
] | 2008-07-08 | [
[
"Neville",
"Donald E.",
""
]
] | Estimates are given of the time scales which govern spreading of a coherent state wave packet. The estimates, based on dimensional analysis, suggest that spreading should be small for coherent states with average angular momentum of order 100 or larger. It is conjectured that in the classical limit, terms in the Hamilt... |
2201.10748 | Yunqi Liu | Hong Guo, Yunqi Liu, Chao Zhang, Yungui Gong, Wei-Liang Qian, Rui-Hong
Yue | Detection of scalar fields by Extreme Mass Ratio Inspirals with a Kerr
black hole | 22 pages, 7 figures | PhysRevD.106.024047 (2022) | 10.1103/PhysRevD.106.024047 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study extreme mass ratio inspirals occurring in modified gravity, for
which the system is modeled by a small compact object with scalar charge
spiraling into a supermassive Kerr black hole. Besides the tensorial
gravitational waves arising from the metric perturbations, radiations are also
induced by the scalar fi... | [
{
"created": "Wed, 26 Jan 2022 04:50:23 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Jul 2022 03:24:38 GMT",
"version": "v2"
}
] | 2022-07-28 | [
[
"Guo",
"Hong",
""
],
[
"Liu",
"Yunqi",
""
],
[
"Zhang",
"Chao",
""
],
[
"Gong",
"Yungui",
""
],
[
"Qian",
"Wei-Liang",
""
],
[
"Yue",
"Rui-Hong",
""
]
] | We study extreme mass ratio inspirals occurring in modified gravity, for which the system is modeled by a small compact object with scalar charge spiraling into a supermassive Kerr black hole. Besides the tensorial gravitational waves arising from the metric perturbations, radiations are also induced by the scalar fiel... |
gr-qc/9808068 | Alena Pravdova | J. Bicak, A. Pravdova | Symmetries of asymptotically flat electrovacuum spacetimes and radiation | 23 pages, RevTeX, to appear in JMP | J.Math.Phys. 39 (1998) 6011-6039 | 10.1063/1.532611 | null | gr-qc | null | Symmetries compatible with asymptotic flatness and admitting gravitational
and electromagnetic radiation are studied by using the Bondi-Sachs-van der Burg
formalism. It is shown that in axially symmetric electrovacuum spacetimes in
which at least locally a smooth null infinity in the sense of Penrose exists,
the only... | [
{
"created": "Tue, 25 Aug 1998 14:50:59 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Bicak",
"J.",
""
],
[
"Pravdova",
"A.",
""
]
] | Symmetries compatible with asymptotic flatness and admitting gravitational and electromagnetic radiation are studied by using the Bondi-Sachs-van der Burg formalism. It is shown that in axially symmetric electrovacuum spacetimes in which at least locally a smooth null infinity in the sense of Penrose exists, the only s... |
1409.8144 | Lisa Glaser | Lisa Glaser | Endeavours in Discrete Lorentzian Geometry; A thesis in five papers | Ph.D. thesis, slight modification for online version, 105 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To solve the path integral for quantum gravity, one needs to regularise the
space-times that are summed over. This regularisation usually is a
discretisation, which makes it necessary to give up some paradigms or
symmetries of continuum physics.
Causal dynamical triangulations regularises the path integral through ... | [
{
"created": "Mon, 29 Sep 2014 14:55:27 GMT",
"version": "v1"
}
] | 2014-09-30 | [
[
"Glaser",
"Lisa",
""
]
] | To solve the path integral for quantum gravity, one needs to regularise the space-times that are summed over. This regularisation usually is a discretisation, which makes it necessary to give up some paradigms or symmetries of continuum physics. Causal dynamical triangulations regularises the path integral through a si... |
1509.03884 | Cosimo Bambi | Cosimo Bambi | Testing black hole candidates with electromagnetic radiation | 47 pages, 26 figures. Invited review paper for Reviews of Modern
Physics. v3: refereed version. v4: minor typos corrected | Rev. Mod. Phys. 89, 025001 (2017) | 10.1103/RevModPhys.89.025001 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Astrophysical black hole candidates are thought to be the Kerr black holes of
general relativity, but there is not yet direct observational evidence that the
spacetime geometry around these objects is described by the Kerr solution. The
study of the properties of the electromagnetic radiation emitted by gas or
stars ... | [
{
"created": "Sun, 13 Sep 2015 19:05:18 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Sep 2015 19:18:54 GMT",
"version": "v2"
},
{
"created": "Wed, 23 Nov 2016 18:20:50 GMT",
"version": "v3"
},
{
"created": "Thu, 6 Apr 2017 21:41:09 GMT",
"version": "v4"
}
] | 2017-04-10 | [
[
"Bambi",
"Cosimo",
""
]
] | Astrophysical black hole candidates are thought to be the Kerr black holes of general relativity, but there is not yet direct observational evidence that the spacetime geometry around these objects is described by the Kerr solution. The study of the properties of the electromagnetic radiation emitted by gas or stars or... |
1206.0506 | Chiang-Mei Chen | Ming-Fan Wu, Chiang-Mei Chen, Jian-Liang Liu, James M. Nester | Quasi-local Energy for Spherically Symmetric Spacetimes | 16 pages, no figures | null | 10.1007/s10714-012-1399-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present two complementary approaches for determining the reference for the
covariant Hamiltonian boundary term quasi-local energy and test them on
spherically symmetric spacetimes. On the one hand, we isometrically match the
2-surface and extremize the energy. This can be done in two ways, which we call
programs I... | [
{
"created": "Mon, 4 Jun 2012 01:21:28 GMT",
"version": "v1"
}
] | 2015-06-05 | [
[
"Wu",
"Ming-Fan",
""
],
[
"Chen",
"Chiang-Mei",
""
],
[
"Liu",
"Jian-Liang",
""
],
[
"Nester",
"James M.",
""
]
] | We present two complementary approaches for determining the reference for the covariant Hamiltonian boundary term quasi-local energy and test them on spherically symmetric spacetimes. On the one hand, we isometrically match the 2-surface and extremize the energy. This can be done in two ways, which we call programs I (... |
2105.05954 | Marco Schreck MS | Carlos M. Reyes and Marco Schreck | Hamiltonian formulation of an effective modified gravity with
nondynamical background fields | 79 pages, 1 figure, prepared for submission to JHEP | null | 10.1103/PhysRevD.104.124042 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The current paper is dedicated to developing a (3+1) decomposition for the
minimal gravitational Standard-Model Extension. Our setting is explicit
diffeomorphism violation and we focus on the background fields known in the
literature as $u$ and $s^{\mu\nu}$. The Hamiltonian formalism is developed for
these contributi... | [
{
"created": "Wed, 12 May 2021 20:30:37 GMT",
"version": "v1"
}
] | 2022-01-05 | [
[
"Reyes",
"Carlos M.",
""
],
[
"Schreck",
"Marco",
""
]
] | The current paper is dedicated to developing a (3+1) decomposition for the minimal gravitational Standard-Model Extension. Our setting is explicit diffeomorphism violation and we focus on the background fields known in the literature as $u$ and $s^{\mu\nu}$. The Hamiltonian formalism is developed for these contribution... |
1203.3963 | Daniela Doneva | Daniela D. Doneva, Stoytcho S. Yazadjiev | Non-radial oscillations of anisotropic neutron stars in the Cowling
approximation | 17 pages, 8 figures; title changed, comments added | Phys. Rev. D 85, 124023 (2012) | 10.1103/PhysRevD.85.124023 | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the most common assumptions in the study of neutron star models and
their oscillations is that the pressure is isotopic, however there are
arguments that this may not be correct. Thus in the present paper we make a
first step towards studying the nonradial oscillations of neutron stars with an
anisotropic pres... | [
{
"created": "Sun, 18 Mar 2012 15:39:44 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Jun 2012 12:22:03 GMT",
"version": "v2"
}
] | 2012-06-25 | [
[
"Doneva",
"Daniela D.",
""
],
[
"Yazadjiev",
"Stoytcho S.",
""
]
] | One of the most common assumptions in the study of neutron star models and their oscillations is that the pressure is isotopic, however there are arguments that this may not be correct. Thus in the present paper we make a first step towards studying the nonradial oscillations of neutron stars with an anisotropic pressu... |
0711.4554 | Diana Lopez Nacir | Diana L\'opez Nacir and Francisco D. Mazzitelli | New counterterms induced by trans-Planckian physics in semiclassical
gravity | null | Phys.Rev.D78:044001,2008 | 10.1103/PhysRevD.78.044001 | null | gr-qc hep-th | null | We consider free and self-interacting quantum scalar fields satisfying
modified dispersion relations in the framework of Einstein-Aether theory. Using
adiabatic regularization, we study the renormalization of the equation for the
mean value of the field in the self-interacting case, and the renormalization
of the sem... | [
{
"created": "Wed, 28 Nov 2007 18:16:56 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Nacir",
"Diana López",
""
],
[
"Mazzitelli",
"Francisco D.",
""
]
] | We consider free and self-interacting quantum scalar fields satisfying modified dispersion relations in the framework of Einstein-Aether theory. Using adiabatic regularization, we study the renormalization of the equation for the mean value of the field in the self-interacting case, and the renormalization of the semic... |
1612.07390 | H\'el\`ene Pihan-Le Bars | H. Pihan-Le Bars, C. Guerlin, R.-D. Lasseri, J.-P. Ebran, Q. G.
Bailey, S. Bize, E. Khan, P. Wolf | Lorentz-symmetry test at Planck-scale suppression with nucleons in a
spin-polarized $^{133}$Cs cold atom clock | null | Phys. Rev. D 95, 075026 (2017) | 10.1103/PhysRevD.95.075026 | null | gr-qc hep-ex nucl-th physics.atom-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce an improved model that links the frequency shift of the
$^{133}\text{Cs}$ hyperfine Zeeman transitions $\vert F = 3, m_F>
\longleftrightarrow \vert F = 4, m_F >$ to the Lorentz-violating Standard-Model
Extension (SME) coefficients of the proton and neutron. The new model uses
Lorentz transformations deve... | [
{
"created": "Wed, 21 Dec 2016 23:32:35 GMT",
"version": "v1"
},
{
"created": "Wed, 31 May 2017 09:46:47 GMT",
"version": "v2"
}
] | 2017-06-01 | [
[
"Bars",
"H. Pihan-Le",
""
],
[
"Guerlin",
"C.",
""
],
[
"Lasseri",
"R. -D.",
""
],
[
"Ebran",
"J. -P.",
""
],
[
"Bailey",
"Q. G.",
""
],
[
"Bize",
"S.",
""
],
[
"Khan",
"E.",
""
],
[
"Wolf",
"P.... | We introduce an improved model that links the frequency shift of the $^{133}\text{Cs}$ hyperfine Zeeman transitions $\vert F = 3, m_F> \longleftrightarrow \vert F = 4, m_F >$ to the Lorentz-violating Standard-Model Extension (SME) coefficients of the proton and neutron. The new model uses Lorentz transformations develo... |
1607.06185 | Yong-Wan Kim | Yong-Wan Kim, Seung Kook Kim, Young-Jai Park | Thermodynamic stability of modified Schwarzschild-AdS black hole in
rainbow gravity | 24 pages, 9 figures, references added, version to appear in EPJC | null | 10.1140/epjc/s10052-016-4393-1 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we have extended the previous study of the thermodynamics and
phase transition of the Schwarzschild black hole in the rainbow gravity to the
Schwarzschild-AdS black hole where metric depends on the energy of a probe.
Making use of the Heisenberg uncertainty principle and the modified dispersion
relatio... | [
{
"created": "Thu, 21 Jul 2016 04:26:58 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Jul 2016 06:46:42 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Sep 2016 02:03:42 GMT",
"version": "v3"
}
] | 2016-11-23 | [
[
"Kim",
"Yong-Wan",
""
],
[
"Kim",
"Seung Kook",
""
],
[
"Park",
"Young-Jai",
""
]
] | In this paper, we have extended the previous study of the thermodynamics and phase transition of the Schwarzschild black hole in the rainbow gravity to the Schwarzschild-AdS black hole where metric depends on the energy of a probe. Making use of the Heisenberg uncertainty principle and the modified dispersion relation,... |
1304.2679 | Norbert Bodendorfer | Norbert Bodendorfer, Thomas Thiemann, Andreas Thurn | New Variables for Classical and Quantum Gravity in all Dimensions V.
Isolated Horizon Boundary Degrees of Freedom | 49 pages. v2. journal version. Reference added | Class. Quantum Grav. 31 (2014) 055002 | 10.1088/0264-9381/31/5/055002 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we generalise the treatment of isolated horizons in loop
quantum gravity, resulting in a Chern-Simons theory on the boundary in the
four-dimensional case, to non-distorted isolated horizons in 2(n+1)-dimensional
spacetimes. The key idea is to generalise the four-dimensional isolated horizon
boundary co... | [
{
"created": "Tue, 9 Apr 2013 18:00:34 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Nov 2014 11:42:41 GMT",
"version": "v2"
}
] | 2014-11-25 | [
[
"Bodendorfer",
"Norbert",
""
],
[
"Thiemann",
"Thomas",
""
],
[
"Thurn",
"Andreas",
""
]
] | In this paper, we generalise the treatment of isolated horizons in loop quantum gravity, resulting in a Chern-Simons theory on the boundary in the four-dimensional case, to non-distorted isolated horizons in 2(n+1)-dimensional spacetimes. The key idea is to generalise the four-dimensional isolated horizon boundary cond... |
1801.00272 | Klaus Kassner | Klaus Kassner | Radially falling test particle approaching an evaporating black hole | 12 pages, 3 figures, revised version, likely to be accepted by
Canadian Journal of Physics | null | 10.1139/cjp-2017-1001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A simple model for an evaporating non-rotating black hole is considered,
employing a global time that does not become singular at the putative horizon.
The dynamics of a test particle falling radially towards the center of the
black hole is then investigated. Contrary to a previous approach, we find that
the particle... | [
{
"created": "Sun, 31 Dec 2017 12:03:25 GMT",
"version": "v1"
},
{
"created": "Fri, 11 May 2018 15:31:52 GMT",
"version": "v2"
}
] | 2019-02-26 | [
[
"Kassner",
"Klaus",
""
]
] | A simple model for an evaporating non-rotating black hole is considered, employing a global time that does not become singular at the putative horizon. The dynamics of a test particle falling radially towards the center of the black hole is then investigated. Contrary to a previous approach, we find that the particle m... |
gr-qc/0404060 | Kostadin Trencevski | Kostadin Trencevski, Emilija G. Celakoska and Vladimir Balan | Research of Gravitation in Flat Minkowski Space | 28 pages | International Journal of Theoretical Physics, 50(1) (2011), 1-26 | 10.1007/s10773-010-0488-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper it is introduced and studied an alternative theory of
gravitation in flat Minkowski space. Using an antisymmetric tensor, which is
analogous to the tensor of electromagnetic field, a non-linear connection is
introduced. It is very convenient for studying the perihelion/periastron shift,
deflection of th... | [
{
"created": "Tue, 13 Apr 2004 16:31:12 GMT",
"version": "v1"
},
{
"created": "Sat, 15 May 2004 18:02:10 GMT",
"version": "v2"
},
{
"created": "Sat, 14 Dec 2013 09:32:26 GMT",
"version": "v3"
}
] | 2013-12-17 | [
[
"Trencevski",
"Kostadin",
""
],
[
"Celakoska",
"Emilija G.",
""
],
[
"Balan",
"Vladimir",
""
]
] | In this paper it is introduced and studied an alternative theory of gravitation in flat Minkowski space. Using an antisymmetric tensor, which is analogous to the tensor of electromagnetic field, a non-linear connection is introduced. It is very convenient for studying the perihelion/periastron shift, deflection of the ... |
1910.06785 | Jerzy Kocik | Jerzy Kocik | Making sense of relativistic composition of velocities | 17 pages, 9 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | What does it mean to ``add'' velocities relativistically -- clarification of
the conceptual problems, new derivations of the related formulas, and
identification of the source of the non-associativity of the standard vector
version of the addition formula are addressed.
| [
{
"created": "Mon, 14 Oct 2019 07:18:14 GMT",
"version": "v1"
}
] | 2019-10-16 | [
[
"Kocik",
"Jerzy",
""
]
] | What does it mean to ``add'' velocities relativistically -- clarification of the conceptual problems, new derivations of the related formulas, and identification of the source of the non-associativity of the standard vector version of the addition formula are addressed. |
1406.5652 | Mariafelicia De Laurentis Professor | Salvatore Capozziello, Mariafelicia De Laurentis, Sergei D. Odintsov | Noether Symmetry Approach in Gauss-Bonnet Cosmology | 9 pages, to appear in Mod. Phys. Lett. A | Modern Physics Letters A Volume 29, Issue 30, 28 September 2014 | 10.1142/S0217732314501648 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the Noether Symmetry Approach in the framework of Gauss-Bonnet
cosmology showing that the functional form of the $F(R, {\cal G})$ function,
where $R$ is the Ricci scalar and ${\cal G}$ is the Gauss-Bonnet topological
invariant, can be determined by the presence of symmetries. Besides, the method
allows to ... | [
{
"created": "Sat, 21 Jun 2014 21:35:11 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Aug 2014 10:03:46 GMT",
"version": "v2"
},
{
"created": "Mon, 4 Aug 2014 12:22:08 GMT",
"version": "v3"
}
] | 2014-11-13 | [
[
"Capozziello",
"Salvatore",
""
],
[
"De Laurentis",
"Mariafelicia",
""
],
[
"Odintsov",
"Sergei D.",
""
]
] | We discuss the Noether Symmetry Approach in the framework of Gauss-Bonnet cosmology showing that the functional form of the $F(R, {\cal G})$ function, where $R$ is the Ricci scalar and ${\cal G}$ is the Gauss-Bonnet topological invariant, can be determined by the presence of symmetries. Besides, the method allows to fi... |
2312.12302 | Lu\'is Filipe Costa | L. Filipe O. Costa, Jos\'e Nat\'ario | Relativistic effects cannot explain galactic dynamics | 11 pages, 6 figures. Slightly improved Section III.A.2, footnotes 3
and 5 added, right plot in Fig. 4 corrected, references added. Version to be
submitted | null | null | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been suggested in recent literature that non-linear and/or
gravitomagnetic general relativistic effects can play a leading role in
galactic dynamics, partially or totally replacing dark matter. Using the 1+3
"quasi-Maxwell" formalism, we show, on general grounds, such hypothesis to be
impossible.
| [
{
"created": "Tue, 19 Dec 2023 16:21:47 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Mar 2024 17:34:55 GMT",
"version": "v2"
}
] | 2024-03-15 | [
[
"Costa",
"L. Filipe O.",
""
],
[
"Natário",
"José",
""
]
] | It has been suggested in recent literature that non-linear and/or gravitomagnetic general relativistic effects can play a leading role in galactic dynamics, partially or totally replacing dark matter. Using the 1+3 "quasi-Maxwell" formalism, we show, on general grounds, such hypothesis to be impossible. |
gr-qc/9305012 | Ulf Danielsson | Ulf H. Danielsson and Marcelo Schiffer | Quantum Mechanics, Common Sense and the Black Hole Information Paradox | 15 pages, Latex, CERN-TH.6889/93 | Phys.Rev. D48 (1993) 4779-4784 | 10.1103/PhysRevD.48.4779 | null | gr-qc hep-th | null | The purpose of this paper is to analyse, in the light of information theory
and with the arsenal of (elementary) quantum mechanics (EPR correlations,
copying machines, teleportation, mixing produced in sub-systems owing to a
trace operation, etc.) the scenarios available on the market to resolve the
so-called black-h... | [
{
"created": "Fri, 14 May 1993 14:02:00 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Danielsson",
"Ulf H.",
""
],
[
"Schiffer",
"Marcelo",
""
]
] | The purpose of this paper is to analyse, in the light of information theory and with the arsenal of (elementary) quantum mechanics (EPR correlations, copying machines, teleportation, mixing produced in sub-systems owing to a trace operation, etc.) the scenarios available on the market to resolve the so-called black-hol... |
2306.07715 | Peter Hintz | Peter Hintz | The linearized Einstein equations with sources | 9 pages | null | null | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | On vacuum spacetimes of general dimension, we study the linearized Einstein
vacuum equations with a spatially compactly supported and (necessarily)
divergence-free source. We prove that the vanishing of appropriate charges of
the source, defined in terms of Killing vector fields on the spacetime, is
necessary and suf... | [
{
"created": "Tue, 13 Jun 2023 12:06:23 GMT",
"version": "v1"
}
] | 2023-06-14 | [
[
"Hintz",
"Peter",
""
]
] | On vacuum spacetimes of general dimension, we study the linearized Einstein vacuum equations with a spatially compactly supported and (necessarily) divergence-free source. We prove that the vanishing of appropriate charges of the source, defined in terms of Killing vector fields on the spacetime, is necessary and suffi... |
gr-qc/9904055 | Jose M. M. Senovilla | G. Bergqvist and J.M.M. Senovilla | On the Causal Propagation of Fields | LaTeX, 9 pages, improved and enlarged version with references added.
To appear as a Letter to Ed. in Clas. Quantum Grav | Class.Quant.Grav.16:L55-L61,1999 | 10.1088/0264-9381/16/10/101 | null | gr-qc hep-th | null | By using geometric methods and superenergy tensors, we find new simple
criteria for the causal propagation of physical fields in spacetimes of any
dimension. The method can be applied easily to many different theories and to
arbitrary fields (such as scalar or electromagnetic ones). In particular, it
provides a conse... | [
{
"created": "Wed, 21 Apr 1999 13:51:08 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Aug 1999 17:11:40 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Bergqvist",
"G.",
""
],
[
"Senovilla",
"J. M. M.",
""
]
] | By using geometric methods and superenergy tensors, we find new simple criteria for the causal propagation of physical fields in spacetimes of any dimension. The method can be applied easily to many different theories and to arbitrary fields (such as scalar or electromagnetic ones). In particular, it provides a conserv... |
1401.4344 | John Barrow | John D. Barrow | Cosmology: the search for twenty-four (or more) functions | 12 pages, no figs, typos corrected, extra discussion in Sec. V and in
refs | Phys. Rev. D89, 064022 (2014) | 10.1103/PhysRevD.89.064022 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We enumerate the 4(1+F)+2S independent arbitrary functions of space require
to describe a general relativistic cosmology containing an arbitrary number of
non-interacting fluid (F) and scalar fields (S). Results are also given for
arbitrary space dimension and for higher-order gravity theories, where the
number incre... | [
{
"created": "Fri, 17 Jan 2014 13:55:59 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Feb 2014 14:38:45 GMT",
"version": "v2"
}
] | 2015-06-18 | [
[
"Barrow",
"John D.",
""
]
] | We enumerate the 4(1+F)+2S independent arbitrary functions of space require to describe a general relativistic cosmology containing an arbitrary number of non-interacting fluid (F) and scalar fields (S). Results are also given for arbitrary space dimension and for higher-order gravity theories, where the number increas... |
2101.02676 | Klaus Liegener Dr | Benjamin Bahr, Klaus Liegener | Properties of the Hamiltonian Renormalisation and its application to
quantum mechanics on the circle | 16 pages | Class.Quant.Grav. 39 (2022) 7, 075010 | 10.1088/1361-6382/ac5050 | null | gr-qc hep-lat math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the Hamiltonian renormalisation group flow of discretised
one-dimensional physical theories. In particular, we investigate the influence
the choice of different embedding maps has on the RG flow and the resulting
continuum limit, and show in which sense they are, and in which sense they are
not equivalent... | [
{
"created": "Thu, 7 Jan 2021 18:35:57 GMT",
"version": "v1"
}
] | 2023-05-05 | [
[
"Bahr",
"Benjamin",
""
],
[
"Liegener",
"Klaus",
""
]
] | We consider the Hamiltonian renormalisation group flow of discretised one-dimensional physical theories. In particular, we investigate the influence the choice of different embedding maps has on the RG flow and the resulting continuum limit, and show in which sense they are, and in which sense they are not equivalent a... |
gr-qc/9605015 | Carlos O. Lousto | Carlos O. Lousto (Univ. Utah) and N. Sanchez (Obs. Paris) | String dynamics in cosmological and black hole backgrounds: The null
string expansion | 17 pages, REVTEX, no figures | Phys.Rev. D54 (1996) 6399-6407 | 10.1103/PhysRevD.54.6399 | null | gr-qc astro-ph hep-th | null | We study the classical dynamics of a bosonic string in the $D$--dimensional
flat Friedmann--Robertson--Walker and Schwarzschild backgrounds. We make a
perturbative development in the string coordinates around a {\it null} string
configuration; the background geometry is taken into account exactly. In the
cosmological... | [
{
"created": "Wed, 8 May 1996 20:21:13 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Lousto",
"Carlos O.",
"",
"Univ. Utah"
],
[
"Sanchez",
"N.",
"",
"Obs. Paris"
]
] | We study the classical dynamics of a bosonic string in the $D$--dimensional flat Friedmann--Robertson--Walker and Schwarzschild backgrounds. We make a perturbative development in the string coordinates around a {\it null} string configuration; the background geometry is taken into account exactly. In the cosmological c... |
1205.2838 | Alikram Aliev | Alikram N. Aliev, G\"oksel Daylan Esmer, Pamir Talazan | Strong Gravity Effects of Rotating Black Holes: Quasiperiodic
Oscillations | 23 pages, 3 figures, 6 tabels; REVTeX; Some changes made to match
published version | Class. Quantum Grav. 30 (2013) 045010 | 10.1088/0264-9381/30/4/045010 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore strong gravity effects of the geodesic motion in the spacetime of
rotating black holes in general relativity and braneworld gravity. We focus on
the description of the motion in terms of three fundamental frequencies: The
orbital frequency, the radial and vertical epicyclic frequencies. For a Kerr
black ho... | [
{
"created": "Sun, 13 May 2012 07:32:47 GMT",
"version": "v1"
},
{
"created": "Sat, 2 Feb 2013 08:54:56 GMT",
"version": "v2"
}
] | 2015-06-05 | [
[
"Aliev",
"Alikram N.",
""
],
[
"Esmer",
"Göksel Daylan",
""
],
[
"Talazan",
"Pamir",
""
]
] | We explore strong gravity effects of the geodesic motion in the spacetime of rotating black holes in general relativity and braneworld gravity. We focus on the description of the motion in terms of three fundamental frequencies: The orbital frequency, the radial and vertical epicyclic frequencies. For a Kerr black hole... |
1905.13557 | Ian H. Redmount | James M. Starke and Ian H. Redmount | Dynamics of Tachyonic Dark Matter | 18 pages, 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Usually considered highly speculative, tachyons can be treated via
straightforward Einsteinian dynamics. Kinetic theory and thermodynamics for a
gas of ``dark'' tachyons are readily constructed. Such a gas exhibits density
and pressure which, for the dominant constituent of a suitable
Friedmann-Robertson-Walker space... | [
{
"created": "Wed, 29 May 2019 20:39:43 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Jun 2022 20:52:15 GMT",
"version": "v2"
}
] | 2022-06-15 | [
[
"Starke",
"James M.",
""
],
[
"Redmount",
"Ian H.",
""
]
] | Usually considered highly speculative, tachyons can be treated via straightforward Einsteinian dynamics. Kinetic theory and thermodynamics for a gas of ``dark'' tachyons are readily constructed. Such a gas exhibits density and pressure which, for the dominant constituent of a suitable Friedmann-Robertson-Walker spaceti... |
1711.01808 | Vee-Liem Saw | Vee-Liem Saw | Bondi mass with a cosmological constant | 29 pages, accepted for publication by Physical Review D | Phys. Rev. D 97, 084017 (2018) | 10.1103/PhysRevD.97.084017 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mass loss of an isolated gravitating system due to energy carried away by
gravitational waves with a cosmological constant $\Lambda\in\R$ was recently
worked out, using the Newman-Penrose-Unti approach. In that same article, an
expression for the Bondi mass of the isolated system, $M_\Lambda$, for the
$\Lambda>0$... | [
{
"created": "Mon, 6 Nov 2017 10:01:05 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Mar 2018 19:38:36 GMT",
"version": "v2"
}
] | 2018-04-18 | [
[
"Saw",
"Vee-Liem",
""
]
] | The mass loss of an isolated gravitating system due to energy carried away by gravitational waves with a cosmological constant $\Lambda\in\R$ was recently worked out, using the Newman-Penrose-Unti approach. In that same article, an expression for the Bondi mass of the isolated system, $M_\Lambda$, for the $\Lambda>0$ c... |
2001.07268 | Zbigniew Haba | Z.Haba | Stochastic inflaton wave equation from an expanding environment | minor changes, 10 pages | Eur.Phys.Journ.C80,321(2020) | 10.1140/epjc/s10052-020-7877-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the inflaton $\phi$ in an environment of scalar fields $\chi_{n}$
on flat and curved manifolds. We average over the environmental fields
$\chi_{n}$. We study a contribution of superhorizon $k<<aH$ as well as
subhorizon $k>> aH$ modes $\chi_{n}({\bf k})$. As a result we obtain a
stochastic wave equation wit... | [
{
"created": "Mon, 20 Jan 2020 22:24:23 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Apr 2020 19:44:04 GMT",
"version": "v2"
}
] | 2020-04-24 | [
[
"Haba",
"Z.",
""
]
] | We discuss the inflaton $\phi$ in an environment of scalar fields $\chi_{n}$ on flat and curved manifolds. We average over the environmental fields $\chi_{n}$. We study a contribution of superhorizon $k<<aH$ as well as subhorizon $k>> aH$ modes $\chi_{n}({\bf k})$. As a result we obtain a stochastic wave equation with ... |
2109.03376 | Qing-Guo Huang | Rong-Zhen Guo, Chen Yuan and Qing-Guo Huang | Near-horizon microstructure and superradiant instability of black holes | 5 pages | null | 10.1103/PhysRevD.105.064029 | null | gr-qc astro-ph.CO hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | Ultralight bosons, as important candidates of dark matter, can condense
around spinning black holes (BHs) to form long-lived ``boson clouds'' due to
superradiance instability. The boson-BH system can be observed through
gravitational wave detection and may become a new window to find traces of
ultralight bosons. In t... | [
{
"created": "Wed, 8 Sep 2021 00:28:40 GMT",
"version": "v1"
}
] | 2022-04-06 | [
[
"Guo",
"Rong-Zhen",
""
],
[
"Yuan",
"Chen",
""
],
[
"Huang",
"Qing-Guo",
""
]
] | Ultralight bosons, as important candidates of dark matter, can condense around spinning black holes (BHs) to form long-lived ``boson clouds'' due to superradiance instability. The boson-BH system can be observed through gravitational wave detection and may become a new window to find traces of ultralight bosons. In thi... |
1001.3569 | Daniela Doneva | Daniela D. Doneva, Stoytcho S. Yazadjiev, Kostas D. Kokkotas, Ivan Zh.
Stefanov, Michail D. Todorov | Charged anti-de Sitter scalar-tensor black holes and their thermodynamic
phase structure | 35 pages, 23 figures; v2: typos corrected, comments and references
added | Phys.Rev.D81:104030,2010 | 10.1103/PhysRevD.81.104030 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present paper we numerically construct new charged anti-de Sitter
black holes coupled to nonlinear Born-Infeld electrodynamics within a certain
class of scalar-tensor theories. The properties of the solutions are
investigated both numerically and analytically. We also study the
thermodynamics of the black hole... | [
{
"created": "Wed, 20 Jan 2010 19:47:31 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Feb 2011 19:17:12 GMT",
"version": "v2"
}
] | 2011-02-15 | [
[
"Doneva",
"Daniela D.",
""
],
[
"Yazadjiev",
"Stoytcho S.",
""
],
[
"Kokkotas",
"Kostas D.",
""
],
[
"Stefanov",
"Ivan Zh.",
""
],
[
"Todorov",
"Michail D.",
""
]
] | In the present paper we numerically construct new charged anti-de Sitter black holes coupled to nonlinear Born-Infeld electrodynamics within a certain class of scalar-tensor theories. The properties of the solutions are investigated both numerically and analytically. We also study the thermodynamics of the black holes ... |
1508.01630 | Ahmet Baykal | Ahmet Baykal and Tekin Dereli | A nonminimally coupled Einstein-Maxwell model in a non-Riemann
space-time with torsion | 1+10 pages, minor corrections to the text, published version | Phys.Rev. D92 (2015) 6, 065018 | 10.1103/PhysRevD.92.065018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A system of field equations for an Einstein-Maxwell model with $RF^2$-type
nonminimal coupling in a non-Riemannian space-time with a non-vanishing torsion
is derived and the resulting field equations are expressed in terms of the
Riemannian quantities based on a metric with a Lorentzian signature. The
torsion is gene... | [
{
"created": "Fri, 7 Aug 2015 07:43:00 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Oct 2015 06:38:11 GMT",
"version": "v2"
}
] | 2015-10-28 | [
[
"Baykal",
"Ahmet",
""
],
[
"Dereli",
"Tekin",
""
]
] | A system of field equations for an Einstein-Maxwell model with $RF^2$-type nonminimal coupling in a non-Riemannian space-time with a non-vanishing torsion is derived and the resulting field equations are expressed in terms of the Riemannian quantities based on a metric with a Lorentzian signature. The torsion is genera... |
1205.6269 | Shao-Feng Wu | Xiao-Qing Shen, Shao-Feng Wu, Guo-Hong Yang | Spontaneously induced general relativity with holographic interior and
general exterior | 16 pages, 5 figures; v3: clarification improved, revised version
accepted by PLB | Physics Letters B 716 (2012) pp. 370-376 | 10.1016/j.physletb.2012.08.048 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the spontaneously induced general relativity (GR) from the
scalar-tensor gravity. We demonstrate by numerical methods that a novel inner
core can be connected to the Schwarzschild exterior with cosmological constants
and any sectional curvature. Deriving an analytic core metric for a general
exterior, we sho... | [
{
"created": "Tue, 29 May 2012 05:42:38 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jul 2012 11:33:48 GMT",
"version": "v2"
},
{
"created": "Fri, 31 Aug 2012 08:47:23 GMT",
"version": "v3"
}
] | 2012-09-03 | [
[
"Shen",
"Xiao-Qing",
""
],
[
"Wu",
"Shao-Feng",
""
],
[
"Yang",
"Guo-Hong",
""
]
] | We study the spontaneously induced general relativity (GR) from the scalar-tensor gravity. We demonstrate by numerical methods that a novel inner core can be connected to the Schwarzschild exterior with cosmological constants and any sectional curvature. Deriving an analytic core metric for a general exterior, we show ... |
2103.12319 | Miguel Cruz | V\'ictor H. C\'ardenas, Miguel Cruz and Samuel Lepe | Matter production effects and interacting scenario within a
reconstructed mimetic cosmology for late times | 24 pages, 8 figures, references added. Accepted for publication in
EPJC | Eur. Phys. J. C 81, 631 (2021) | 10.1140/epjc/s10052-021-09442-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we explore two possible scenarios that can be considered to
extend a recent proposed model by the authors known as reconstructed mimetic
cosmology. This study is complemented with an statistical analysis for each
case. The first scenario considers the inclusion of matter production as a
possible source o... | [
{
"created": "Tue, 23 Mar 2021 05:23:51 GMT",
"version": "v1"
},
{
"created": "Fri, 21 May 2021 19:06:02 GMT",
"version": "v2"
},
{
"created": "Mon, 12 Jul 2021 10:21:52 GMT",
"version": "v3"
}
] | 2021-07-23 | [
[
"Cárdenas",
"Víctor H.",
""
],
[
"Cruz",
"Miguel",
""
],
[
"Lepe",
"Samuel",
""
]
] | In this work we explore two possible scenarios that can be considered to extend a recent proposed model by the authors known as reconstructed mimetic cosmology. This study is complemented with an statistical analysis for each case. The first scenario considers the inclusion of matter production as a possible source of ... |
gr-qc/0407115 | Wei-Tou Ni | Yi-Cheng Huang and Wei-Tou Ni | Propagation of Dirac Wave Functions in Accelerated Frames of Reference | 20 pages | null | null | null | gr-qc | null | The first-order gravity effects of Dirac wave functions are found from the
inertial effects in the accelerated frames of reference. Derivations and
discussions about Lense-Thirring effect and the gyrogravitational ratio for
intrinsic spin are presented. We use coordinate transformations among reference
frames to stud... | [
{
"created": "Fri, 30 Jul 2004 09:03:11 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Huang",
"Yi-Cheng",
""
],
[
"Ni",
"Wei-Tou",
""
]
] | The first-order gravity effects of Dirac wave functions are found from the inertial effects in the accelerated frames of reference. Derivations and discussions about Lense-Thirring effect and the gyrogravitational ratio for intrinsic spin are presented. We use coordinate transformations among reference frames to study ... |
gr-qc/0401095 | Banibrata Mukhopadhyay | Banibrata Mukhopadhyay | Neutrino asymmetry in presence of gravitational interaction | 3 latex pages; 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_0078 | null | gr-qc astro-ph hep-ph | null | Propagation of fermions in curved space-time generates a gravitational
interaction due to the coupling between spin of the fermion and space-time
curvature. This gravitational interaction, which is an axial-vector appears as
the CPT violating term in the Lagrangian, can generate the neutrino asymmetry
in Universe. If... | [
{
"created": "Thu, 22 Jan 2004 10:26:56 GMT",
"version": "v1"
},
{
"created": "Sat, 7 Feb 2004 19:38:53 GMT",
"version": "v2"
}
] | 2016-11-09 | [
[
"Mukhopadhyay",
"Banibrata",
""
]
] | Propagation of fermions in curved space-time generates a gravitational interaction due to the coupling between spin of the fermion and space-time curvature. This gravitational interaction, which is an axial-vector appears as the CPT violating term in the Lagrangian, can generate the neutrino asymmetry in Universe. If t... |
gr-qc/0207109 | Juan P. Pertierra | C.B. Hart, R. Held, P.K. Hoiland, S. Jenks, F. Loup, D. Martins, J.
Nyman, J.P. Pertierra, P.A. Santos, M.A. Shore, R. Sims, M. Stabno, T.O.M.
Teage | On the Problems of Hazardous Matter and Radiation at Faster than Light
Speeds in the Warp Drive Space-Time | 9 pages | null | null | null | gr-qc | null | The problems of hazardous radiation and collisions with matter on a warp
driven ship pose considerable obstacles to this possibility for interstellar
travel. A solution to these problems lies in the Broeck metric. It is
demonstrated that both threats to the ship will be greatly reduced. It is also
shown that the hori... | [
{
"created": "Sat, 27 Jul 2002 05:06:08 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hart",
"C. B.",
""
],
[
"Held",
"R.",
""
],
[
"Hoiland",
"P. K.",
""
],
[
"Jenks",
"S.",
""
],
[
"Loup",
"F.",
""
],
[
"Martins",
"D.",
""
],
[
"Nyman",
"J.",
""
],
[
"Pertierra",
"J. P.",
... | The problems of hazardous radiation and collisions with matter on a warp driven ship pose considerable obstacles to this possibility for interstellar travel. A solution to these problems lies in the Broeck metric. It is demonstrated that both threats to the ship will be greatly reduced. It is also shown that the horizo... |
1503.02063 | Hannu Nyrhinen | Tomi Koivisto and Hannu J. Nyrhinen | Stability of disformally coupled accretion disks | 14 pages, 6 figures, abstract and introduction rewritten, typos
corrected | Phys. Scr. 92 105301 (2017) | 10.1088/1402-4896/aa85cc | NORDITA-2015-28, HIP-2015-10/TH | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The no-hair theorem postulates that the only externally observable properties
of a black hole are its mass, its electric charge, and its angular momentum. In
scalar-tensor theories of gravity, a matter distribution around a black hole
can lead to the so called "spontaneous scalarisation" instability that triggers
the... | [
{
"created": "Fri, 6 Mar 2015 20:44:21 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Jun 2015 17:11:07 GMT",
"version": "v2"
},
{
"created": "Sun, 20 Aug 2017 14:29:58 GMT",
"version": "v3"
}
] | 2017-09-14 | [
[
"Koivisto",
"Tomi",
""
],
[
"Nyrhinen",
"Hannu J.",
""
]
] | The no-hair theorem postulates that the only externally observable properties of a black hole are its mass, its electric charge, and its angular momentum. In scalar-tensor theories of gravity, a matter distribution around a black hole can lead to the so called "spontaneous scalarisation" instability that triggers the d... |
1802.04795 | Cristobal Corral | Yuri Bonder and Cristobal Corral | Unimodular Einstein--Cartan gravity: Dynamics and conservation laws | 8 pages, 1 Appendix, matches published version | Phys. Rev. D 97, 084001 (2018) | 10.1103/PhysRevD.97.084001 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Unimodular gravity is an interesting approach to address the cosmological
constant problem, since the vacuum energy density of quantum fields does not
gravitate in this framework, and the cosmological constant appears as an
integration constant. These features arise as a consequence of considering a
constrained volum... | [
{
"created": "Tue, 13 Feb 2018 18:58:45 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Apr 2018 18:31:15 GMT",
"version": "v2"
}
] | 2018-04-11 | [
[
"Bonder",
"Yuri",
""
],
[
"Corral",
"Cristobal",
""
]
] | Unimodular gravity is an interesting approach to address the cosmological constant problem, since the vacuum energy density of quantum fields does not gravitate in this framework, and the cosmological constant appears as an integration constant. These features arise as a consequence of considering a constrained volume ... |
1608.02283 | Istvan Racz | Istv\'an R\'acz | Can we prescribe the physical parameters of multiple black holes? | updated to the published version | Mathematics 9, no. 24: 3170 (2021) | 10.3390/math9243170 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The parabolic-hyperbolic form of the constraints and superposed Kerr-Schild
black holes have already been used to provide a radically new initialization of
binary black hole configurations. The method generalizes straightforwardly to
multiple black hole systems. This paper is to verify that each of the global
Arnowit... | [
{
"created": "Sun, 7 Aug 2016 23:53:00 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Aug 2016 15:13:09 GMT",
"version": "v2"
},
{
"created": "Sun, 20 Nov 2016 17:55:23 GMT",
"version": "v3"
},
{
"created": "Mon, 6 Feb 2017 21:38:28 GMT",
"version": "v4"
},
{
"cre... | 2021-12-10 | [
[
"Rácz",
"István",
""
]
] | The parabolic-hyperbolic form of the constraints and superposed Kerr-Schild black holes have already been used to provide a radically new initialization of binary black hole configurations. The method generalizes straightforwardly to multiple black hole systems. This paper is to verify that each of the global Arnowitt-... |
1304.0529 | Shahar Hod | Shahar Hod | Asymptotic spectrum of the oblate spin-weighted spheroidal harmonics: a
WKB analysis | 4 pages | Physics Letters B 717, 462 (2012) | 10.1016/j.physletb.2012.09.057 | null | gr-qc astro-ph.HE hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spin-weighted spheroidal harmonics play a central role in the mathematical
description of diverse physical phenomena, including black-hole perturbation
theory and wave scattering. We present a novel and compact derivation of the
asymptotic eigenvalues of these important functions. Our analysis is based on a
simple tr... | [
{
"created": "Tue, 2 Apr 2013 04:47:33 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Hod",
"Shahar",
""
]
] | Spin-weighted spheroidal harmonics play a central role in the mathematical description of diverse physical phenomena, including black-hole perturbation theory and wave scattering. We present a novel and compact derivation of the asymptotic eigenvalues of these important functions. Our analysis is based on a simple tric... |
gr-qc/0105097 | Donald C. Salisbury | Donald C. Salisbury | Quantum general invariance and loop gravity | To appear in Foundations of Physics | Found.Phys. 31 (2001) 1105-1118 | null | null | gr-qc | null | A quantum physical projector is proposed for generally covariant theories
which are derivable from a Lagrangian. The projector is the quantum analogue of
the integral over the generators of finite one-parameter subgroups of the gauge
symmetry transformations which are connected to the identity. Gauge variables
are re... | [
{
"created": "Sun, 27 May 2001 06:04:16 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Salisbury",
"Donald C.",
""
]
] | A quantum physical projector is proposed for generally covariant theories which are derivable from a Lagrangian. The projector is the quantum analogue of the integral over the generators of finite one-parameter subgroups of the gauge symmetry transformations which are connected to the identity. Gauge variables are reta... |
gr-qc/0609024 | Tanmay Vachaspati | Tanmay Vachaspati, Dejan Stojkovic and Lawrence M. Krauss | Observation of Incipient Black Holes and the Information Loss Problem | 15 pages; 9 figures. Changes made in response to referee's comments
and to clarify arguments, in particular to describe clearly that the results
represent observations made by an asymptotic observer. Accepted for
publication in Phys. Rev. D | Phys.Rev.D76:024005,2007 | 10.1103/PhysRevD.76.024005 | null | gr-qc astro-ph hep-ph hep-th | null | We study the formation of black holes by spherical domain wall collapse as
seen by an asymptotic observer, using the functional Schrodinger formalism. To
explore what signals such observers will see, we study radiation of a scalar
quantum field in the collapsing domain wall background. The total energy flux
radiated ... | [
{
"created": "Thu, 7 Sep 2006 11:06:26 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Oct 2006 01:29:50 GMT",
"version": "v2"
},
{
"created": "Thu, 7 Jun 2007 15:01:01 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Vachaspati",
"Tanmay",
""
],
[
"Stojkovic",
"Dejan",
""
],
[
"Krauss",
"Lawrence M.",
""
]
] | We study the formation of black holes by spherical domain wall collapse as seen by an asymptotic observer, using the functional Schrodinger formalism. To explore what signals such observers will see, we study radiation of a scalar quantum field in the collapsing domain wall background. The total energy flux radiated di... |
0803.0518 | Joel Saavedra | Samuel Lepe, Francisco Pe\~na and Joel Saavedra | Randall-Sundrum model with $\lambda<0$ and bulk brane viscosity | 4 pages. Submitted to PLB | Phys.Lett.B662:217-219,2008 | 10.1016/j.physletb.2008.03.016 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effect of the inclusion of bulk brane viscosity on brane world
(BW) cosmology in the framework of the Eckart's theory, we focus in the
Randall-Sundrum model with negative tension on the brane.
| [
{
"created": "Tue, 4 Mar 2008 18:55:37 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Lepe",
"Samuel",
""
],
[
"Peña",
"Francisco",
""
],
[
"Saavedra",
"Joel",
""
]
] | We study the effect of the inclusion of bulk brane viscosity on brane world (BW) cosmology in the framework of the Eckart's theory, we focus in the Randall-Sundrum model with negative tension on the brane. |
1511.00572 | Gopi Kant Goswami Dr | G. K. Goswami, R. N. Dewangan, Anil Kumar Yadav | $\Lambda$-CDM type Heckmann - Suchuking model and union 2.1 compilation | 9 pages, 5 figures | Gravitation & Cosmology (Springer),Vol. 22, 388 - 393 (2016) | 10.1134/S0202289316040083 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we have investigated $\Lambda$CDM type cosmological model in
Heckmann-Schucking space-time, by using 287 high red shift ($ .3 \leq z \leq
1.4$ ) SN Ia data of observed absolute magnitude along with their possible
error from Union 2.1 compilation. We have used $\chi^{2}$ test to compare Union
2.1 compil... | [
{
"created": "Sun, 18 Oct 2015 05:37:55 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Feb 2016 14:19:55 GMT",
"version": "v2"
},
{
"created": "Wed, 5 Oct 2016 14:57:58 GMT",
"version": "v3"
}
] | 2016-11-01 | [
[
"Goswami",
"G. K.",
""
],
[
"Dewangan",
"R. N.",
""
],
[
"Yadav",
"Anil Kumar",
""
]
] | In this paper, we have investigated $\Lambda$CDM type cosmological model in Heckmann-Schucking space-time, by using 287 high red shift ($ .3 \leq z \leq 1.4$ ) SN Ia data of observed absolute magnitude along with their possible error from Union 2.1 compilation. We have used $\chi^{2}$ test to compare Union 2.1 compilat... |
1101.3933 | Vladimir Kobelev V. | V. Kobelev | The variant of post-Newtonian mechanics with generalized fractional
derivatives | null | CHAOS 16, 043117 (2006) | 10.1063/1.2384864 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we investigate mathematically the variant of post-Newtonian
mechanics using generalized fractional derivatives. The relativistic-covariant
generalization of the classical equations for gravitational field is studied.
The equations match to (i) the weak Newtonian limit on the moderate scales,
(ii) deli... | [
{
"created": "Thu, 20 Jan 2011 15:31:56 GMT",
"version": "v1"
}
] | 2011-01-21 | [
[
"Kobelev",
"V.",
""
]
] | In this article we investigate mathematically the variant of post-Newtonian mechanics using generalized fractional derivatives. The relativistic-covariant generalization of the classical equations for gravitational field is studied. The equations match to (i) the weak Newtonian limit on the moderate scales, (ii) delive... |
2111.03243 | Kota Ogasawara | Kota Ogasawara, Takahisa Igata | Photon escape in the extremal Kerr black hole spacetime | 17pages, 23figures | null | 10.1103/PhysRevD.105.024031 | KUNS-2900, KEK-Cosmo-0279, KEK-TH-2363 | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider necessary and sufficient conditions for photons emitted from an
arbitrary spacetime position of the extremal Kerr black hole to escape to
infinity. The radial equation of motion determines the necessary conditions for
photons emitted from $r=r_*$ to escape to infinity, and the polar angle
equation of moti... | [
{
"created": "Fri, 5 Nov 2021 03:41:49 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jan 2022 10:15:23 GMT",
"version": "v2"
}
] | 2022-01-19 | [
[
"Ogasawara",
"Kota",
""
],
[
"Igata",
"Takahisa",
""
]
] | We consider necessary and sufficient conditions for photons emitted from an arbitrary spacetime position of the extremal Kerr black hole to escape to infinity. The radial equation of motion determines the necessary conditions for photons emitted from $r=r_*$ to escape to infinity, and the polar angle equation of motion... |
2307.14555 | Hyerim Noh | Jai-chan Hwang and Hyerim Noh | Maxwell equations in curved spacetime | 12 pages, no figure, published in Eur. Phys. J. C | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In curved spacetime, Maxwell's equations can be expressed in forms valid in
Minkowski background, with the effect of the metric (gravity) appearing as
effective polarizations and magnetizations. The electric and magnetic (EM)
fields depend on the observer's frame four-vector. We derive Maxwell's
equations valid in ge... | [
{
"created": "Thu, 27 Jul 2023 00:30:00 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Dec 2023 00:01:00 GMT",
"version": "v2"
}
] | 2023-12-25 | [
[
"Hwang",
"Jai-chan",
""
],
[
"Noh",
"Hyerim",
""
]
] | In curved spacetime, Maxwell's equations can be expressed in forms valid in Minkowski background, with the effect of the metric (gravity) appearing as effective polarizations and magnetizations. The electric and magnetic (EM) fields depend on the observer's frame four-vector. We derive Maxwell's equations valid in gene... |
gr-qc/0205068 | Tatyana P. Shestakova | T. P. Shestakova | Quantum geometrodynamical description of the Universe in different
reference frames | LaTeX, 6 pages, talk presented at the V International Conference on
Gravitation and Astrophysics of Asian-Pacific countries, Moscow, October 2001 | Grav.Cosmol.Suppl. 8N2 (2002) 140-142 | null | null | gr-qc | null | Several years ago the so-called quantum geometrodynamics in extended phase
space was proposed. The main role in this version of quantum geometrodynamics
is given to a wave function that carries information about geometry of the
Universe as well as about a reference frame in which this geometry is studied.
We consider... | [
{
"created": "Thu, 16 May 2002 10:58:01 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Shestakova",
"T. P.",
""
]
] | Several years ago the so-called quantum geometrodynamics in extended phase space was proposed. The main role in this version of quantum geometrodynamics is given to a wave function that carries information about geometry of the Universe as well as about a reference frame in which this geometry is studied. We consider t... |
1601.00471 | Julio Cesar Fabris | Manuel E. Rodrigues, Julio C. Fabris, Ednaldo L. B. Junior, Glauber T.
Marques | Generalization of Regular Black Holes in General Relativity to $f(R)$
Gravity | Latex file, 11 pages, 5 figures in eps format | null | 10.1140/epjc/s10052-016-4085-x | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we determine regular black hole solutions using a very general
$f(R)$ theory, coupled to a non-linear electromagnetic field given by a
Lagrangian $\mathcal{L}_{NED}$. The functions $f(R)$ and $\mathcal{L}_{NED}$
are left in principle unspecified. Instead, the model is constructed through a
choice of th... | [
{
"created": "Mon, 4 Jan 2016 12:13:36 GMT",
"version": "v1"
}
] | 2016-05-25 | [
[
"Rodrigues",
"Manuel E.",
""
],
[
"Fabris",
"Julio C.",
""
],
[
"Junior",
"Ednaldo L. B.",
""
],
[
"Marques",
"Glauber T.",
""
]
] | In this paper, we determine regular black hole solutions using a very general $f(R)$ theory, coupled to a non-linear electromagnetic field given by a Lagrangian $\mathcal{L}_{NED}$. The functions $f(R)$ and $\mathcal{L}_{NED}$ are left in principle unspecified. Instead, the model is constructed through a choice of the ... |
gr-qc/0405016 | Bernd Reimann | Bernd Reimann | Slice Stretching at the Event Horizon when Geodesically Slicing the
Schwarzschild Spacetime with Excision | 5 pages, 2 figures, published version including minor amendments
suggested by the referee | Class.Quant.Grav. 21 (2004) 4297-4304 | 10.1088/0264-9381/21/18/002 | AEI-2004-039 | gr-qc | null | Slice-stretching effects are discussed as they arise at the event horizon
when geodesically slicing the extended Schwarzschild black-hole spacetime while
using singularity excision. In particular, for Novikov and isotropic spatial
coordinates the outward movement of the event horizon (``slice sucking'') and
the unbou... | [
{
"created": "Tue, 4 May 2004 21:53:13 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Aug 2004 21:21:55 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Reimann",
"Bernd",
""
]
] | Slice-stretching effects are discussed as they arise at the event horizon when geodesically slicing the extended Schwarzschild black-hole spacetime while using singularity excision. In particular, for Novikov and isotropic spatial coordinates the outward movement of the event horizon (``slice sucking'') and the unbound... |
gr-qc/0502098 | Dinesh Singh | Dinesh Singh, Nader Mobed, Giorgio Papini | Neutrino Wave Packet Propagation in Gravitational Fields | Updated with more details; 9 pages, 8 figures | Phys.Lett.A351:373-378,2006 | 10.1016/j.physleta.2005.11.032 | null | gr-qc hep-ph hep-th | null | We discuss the propagation of neutrino wave packets in a Lense-Thirring
space-time using a gravitational phase approach. We show that the neutrino
oscillation length is altered by gravitational corrections and that neutrinos
are subject to helicity flip induced by stellar rotation. For the case of a
rapidly rotating ... | [
{
"created": "Wed, 23 Feb 2005 15:31:15 GMT",
"version": "v1"
},
{
"created": "Thu, 12 May 2005 23:58:24 GMT",
"version": "v2"
}
] | 2010-11-19 | [
[
"Singh",
"Dinesh",
""
],
[
"Mobed",
"Nader",
""
],
[
"Papini",
"Giorgio",
""
]
] | We discuss the propagation of neutrino wave packets in a Lense-Thirring space-time using a gravitational phase approach. We show that the neutrino oscillation length is altered by gravitational corrections and that neutrinos are subject to helicity flip induced by stellar rotation. For the case of a rapidly rotating ne... |
2207.08687 | Bibhas Majhi Ranjan | Partha Nandi, Sounak Pal, Sayan Kumar Pal, Bibhas Ranjan Majhi | Low frequency gravitational waves emerge Berry phase | Revised version, title changed, to appear in Phys. Rev. D | null | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The detection of low frequency gravitational waves (LFGWs) astronomy has
marked an advent of new era in the domain of astrophysics and general
relativity. Using the framework of interaction between GWs and a point
two-particles like detector, within linearized gravity approach, we propose a
toy detector model whose q... | [
{
"created": "Mon, 18 Jul 2022 15:37:16 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Nov 2023 07:26:47 GMT",
"version": "v2"
}
] | 2023-11-29 | [
[
"Nandi",
"Partha",
""
],
[
"Pal",
"Sounak",
""
],
[
"Pal",
"Sayan Kumar",
""
],
[
"Majhi",
"Bibhas Ranjan",
""
]
] | The detection of low frequency gravitational waves (LFGWs) astronomy has marked an advent of new era in the domain of astrophysics and general relativity. Using the framework of interaction between GWs and a point two-particles like detector, within linearized gravity approach, we propose a toy detector model whose qua... |
2105.08523 | Faizuddin Ahmed | Faizuddin Ahmed | Type III Spacetime with Closed Timelike Curves | 10 pages, no figure, appeared in PROGRESS IN PHYSICS (PiP) Volume 12,
Issue 4 (October), pp. 329-331 (2016), http://www.ptep-online.com | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a cyclic symmetric space-time, admitting closed time-like curves
(CTCs) which appear after a certain instant of time, i. e., a time-machine
space-time. These closed time-like curves evolve from an initial spacelike
hypersurface on the plane $z$=constant in a causally well-behaved manner. The
space-time dis... | [
{
"created": "Mon, 17 May 2021 07:13:41 GMT",
"version": "v1"
}
] | 2021-05-19 | [
[
"Ahmed",
"Faizuddin",
""
]
] | We present a cyclic symmetric space-time, admitting closed time-like curves (CTCs) which appear after a certain instant of time, i. e., a time-machine space-time. These closed time-like curves evolve from an initial spacelike hypersurface on the plane $z$=constant in a causally well-behaved manner. The space-time discu... |
0806.3065 | Juri Agresti | Juri Agresti | Researches on Non-standard Optics for Advanced Gravitational Waves
Interferometers | Ph.D. thesis, University of Pisa & LIGO-Caltech, 185 pages | null | null | LIGO-P080010-00-R | gr-qc physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This thesis presents a collection of different researches on non-standard
optics in view of enhancing the performances of the Advanced Gravitational
waves interferometric detectors, where the thermal noise of the test masses is
expected to be a limiting factor for their sensitivity.
We provide a quantitative analys... | [
{
"created": "Wed, 18 Jun 2008 18:33:07 GMT",
"version": "v1"
}
] | 2009-12-05 | [
[
"Agresti",
"Juri",
""
]
] | This thesis presents a collection of different researches on non-standard optics in view of enhancing the performances of the Advanced Gravitational waves interferometric detectors, where the thermal noise of the test masses is expected to be a limiting factor for their sensitivity. We provide a quantitative analysis o... |
2404.15164 | Eneko Aranguren | Eneko Aranguren and Ra\"ul Vera | Review on the matching conditions for the tidal problem: towards the
application to more general contexts | null | Gen Relativ Gravit 56, 50 (2024) | 10.1007/s10714-024-03237-5 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The tidal problem is used to obtain the tidal deformability (or Love number)
of stars. The semi-analytical study is usually treated in perturbation theory
as a first order perturbation problem over a spherically symmetric background
configuration consisting of a stellar interior region matched across a boundary
to a ... | [
{
"created": "Tue, 23 Apr 2024 16:02:42 GMT",
"version": "v1"
}
] | 2024-04-24 | [
[
"Aranguren",
"Eneko",
""
],
[
"Vera",
"Raül",
""
]
] | The tidal problem is used to obtain the tidal deformability (or Love number) of stars. The semi-analytical study is usually treated in perturbation theory as a first order perturbation problem over a spherically symmetric background configuration consisting of a stellar interior region matched across a boundary to a va... |
0902.4753 | Muhammad Sharif | M. Sharif and Javaria Zanub | Parallel and Orthogonal Cylindrically Symmetric Self-Similar Solutions | 15 pages, accepted for publication in J. Korean Physical Society | J. Korean Physical Society 54(2009)1373-1379 | 10.3938/jkps.54.1373 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we evaluate kinematic self-similar perfect fluid and dust
solutions for the most general cylindrically symmetric spacetime. We explore
kinematic self-similar solutions of the first, second, zeroth and infinite
kinds for parallel and orthogonal cases. It is found that the parallel case
gives solutions f... | [
{
"created": "Fri, 27 Feb 2009 03:11:43 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Sharif",
"M.",
""
],
[
"Zanub",
"Javaria",
""
]
] | In this paper, we evaluate kinematic self-similar perfect fluid and dust solutions for the most general cylindrically symmetric spacetime. We explore kinematic self-similar solutions of the first, second, zeroth and infinite kinds for parallel and orthogonal cases. It is found that the parallel case gives solutions for... |
2311.15295 | Changkai Chen | Changkai Chen, Jiliang Jing | Gravitational wave fluxes on generic orbits in near-extreme Kerr
spacetime: higher spin and large eccentricity | 14 pages. Update: corrected errors in Eqs. (32-33) | Sci. China-Phys. Mech. Astron. 67, 110411 (2024) | 10.1007/s11433-024-2431-0 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | To obtain the waveform template of gravitational waves (GWs), substantial
computational resources and exceedingly high precision are often required. In
the previous study [JCAP 11 (2023) 070], we efficiently and accurately
calculate GW fluxes of a particle in circular orbits around a Schwarzschild
black hole using th... | [
{
"created": "Sun, 26 Nov 2023 13:30:18 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Apr 2024 07:55:57 GMT",
"version": "v2"
},
{
"created": "Sat, 8 Jun 2024 15:58:47 GMT",
"version": "v3"
},
{
"created": "Tue, 11 Jun 2024 10:19:36 GMT",
"version": "v4"
},
{
"cr... | 2024-07-25 | [
[
"Chen",
"Changkai",
""
],
[
"Jing",
"Jiliang",
""
]
] | To obtain the waveform template of gravitational waves (GWs), substantial computational resources and exceedingly high precision are often required. In the previous study [JCAP 11 (2023) 070], we efficiently and accurately calculate GW fluxes of a particle in circular orbits around a Schwarzschild black hole using the ... |
1604.01012 | Muhammad Sharif | M. Sharif and Saadia Mumtaz | Stability of Thin-Shell Wormholes from Regular ABG Black Hole | 26 pages, 13 figures, submitted for publication | Eur. Phys. J. Plus 132(2017)26 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we construct thin-shell wormholes from regular Ayon-Beato and
Garcia black hole by employing cut and paste formalism and examine their
stability. We analyze attractive and repulsive characteristics of wormholes
corresponding to outward and inward-directed acceleration components,
respectively. A genera... | [
{
"created": "Sat, 2 Apr 2016 05:24:46 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Mar 2017 06:10:48 GMT",
"version": "v2"
}
] | 2017-03-08 | [
[
"Sharif",
"M.",
""
],
[
"Mumtaz",
"Saadia",
""
]
] | In this paper, we construct thin-shell wormholes from regular Ayon-Beato and Garcia black hole by employing cut and paste formalism and examine their stability. We analyze attractive and repulsive characteristics of wormholes corresponding to outward and inward-directed acceleration components, respectively. A general ... |
1903.11622 | Francesco Zappa | Francesco Zappa, Sebastiano Bernuzzi, Francesco Pannarale, Michela
Mapelli, Nicola Giacobbo | Black-hole remnants from black-hole--neutron-star mergers | null | Phys. Rev. Lett. 123, 041102 (2019) | 10.1103/PhysRevLett.123.041102 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Observations of gravitational waves and their electromagnetic counterparts
may soon uncover the existence of coalescing compact binary systems formed by a
stellar-mass black hole and a neutron star. These mergers result in a remnant
black hole, possibly surrounded by an accretion disk. The mass and spin of the
remnan... | [
{
"created": "Wed, 27 Mar 2019 18:02:25 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jan 2020 15:01:08 GMT",
"version": "v2"
}
] | 2020-01-31 | [
[
"Zappa",
"Francesco",
""
],
[
"Bernuzzi",
"Sebastiano",
""
],
[
"Pannarale",
"Francesco",
""
],
[
"Mapelli",
"Michela",
""
],
[
"Giacobbo",
"Nicola",
""
]
] | Observations of gravitational waves and their electromagnetic counterparts may soon uncover the existence of coalescing compact binary systems formed by a stellar-mass black hole and a neutron star. These mergers result in a remnant black hole, possibly surrounded by an accretion disk. The mass and spin of the remnant ... |
2109.08645 | Gabriele Barca | Gabriele Barca, Eleonora Giovannetti, Giovanni Montani | An Overview on the Nature of the Bounce in LQC and PQM | Review article. Appears in special issue "Quantum Cosmology" of the
journal "Universe". 51 pages, 19 figures. See the article for full abstract | Universe 2021, 7, 327 | 10.3390/universe7090327 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a review on basic aspects of quantum cosmology in the presence of
cut-off physics. We first analyze how the Wheeler-DeWitt equation in a pure
metric approach describes the quantum Universe, showing how the singularity is
not removed. We then discuss basic features of loop quantum cosmology. For the
isotrop... | [
{
"created": "Fri, 17 Sep 2021 16:58:37 GMT",
"version": "v1"
}
] | 2021-09-20 | [
[
"Barca",
"Gabriele",
""
],
[
"Giovannetti",
"Eleonora",
""
],
[
"Montani",
"Giovanni",
""
]
] | We present a review on basic aspects of quantum cosmology in the presence of cut-off physics. We first analyze how the Wheeler-DeWitt equation in a pure metric approach describes the quantum Universe, showing how the singularity is not removed. We then discuss basic features of loop quantum cosmology. For the isotropic... |
2310.15183 | Frank Imbens | Frank Imbens | Graphical Processing of Geodesic Propagation in Python | 32 pages, 99 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Black holes and other compact objects are powerful tools to observationally
test Einsteins theory of General Relativity. We develop raytracing code to
create visual images of compact objects that are solutions of Einsteins field
equations. These include Kerr black holes and Manko-Novikov spacetimes with
extra indepen... | [
{
"created": "Fri, 20 Oct 2023 13:03:30 GMT",
"version": "v1"
}
] | 2023-10-25 | [
[
"Imbens",
"Frank",
""
]
] | Black holes and other compact objects are powerful tools to observationally test Einsteins theory of General Relativity. We develop raytracing code to create visual images of compact objects that are solutions of Einsteins field equations. These include Kerr black holes and Manko-Novikov spacetimes with extra independe... |
1502.06987 | Casey Handmer | Casey J. Handmer and B\'ela Szil\'agyi and Jeffrey Winicour | Gauge Invariant Spectral Cauchy Characteristic Extraction | null | null | 10.1088/0264-9381/32/23/235018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present gauge invariant spectral Cauchy characteristic extraction. We
compare gravitational waveforms extracted from a head-on black hole merger
simulated in two different gauges by two different codes. We show rapid
convergence, demonstrating both gauge invariance of the extraction algorithm
and consistency betwe... | [
{
"created": "Tue, 24 Feb 2015 22:04:02 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Aug 2015 23:34:42 GMT",
"version": "v2"
}
] | 2015-12-09 | [
[
"Handmer",
"Casey J.",
""
],
[
"Szilágyi",
"Béla",
""
],
[
"Winicour",
"Jeffrey",
""
]
] | We present gauge invariant spectral Cauchy characteristic extraction. We compare gravitational waveforms extracted from a head-on black hole merger simulated in two different gauges by two different codes. We show rapid convergence, demonstrating both gauge invariance of the extraction algorithm and consistency between... |
1704.04114 | Jos\'e Tom\'as G\'alvez Ghersi | Andrei V. Frolov, Jos\'e T. G\'alvez Ghersi and Alex Zucca | Unscreening scalarons with a black hole | REVTeX 4.1; 18 pages, 24 figures. Minor corrections and references
added | Phys. Rev. D. 95, 104041 (2017) | 10.1103/PhysRevD.95.104041 | SCG-2017-04 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is typically believed that the additional degrees of freedom in any
modification of gravity are completely suppressed by the large energy densities
coexisting with an astrophysical black hole. In this paper, we find that this
might not always be the case. This belief holds for black holes formed via
gravitational ... | [
{
"created": "Tue, 11 Apr 2017 20:19:18 GMT",
"version": "v1"
},
{
"created": "Sat, 6 May 2017 08:40:00 GMT",
"version": "v2"
},
{
"created": "Tue, 30 May 2017 16:55:34 GMT",
"version": "v3"
}
] | 2017-05-31 | [
[
"Frolov",
"Andrei V.",
""
],
[
"Ghersi",
"José T. Gálvez",
""
],
[
"Zucca",
"Alex",
""
]
] | It is typically believed that the additional degrees of freedom in any modification of gravity are completely suppressed by the large energy densities coexisting with an astrophysical black hole. In this paper, we find that this might not always be the case. This belief holds for black holes formed via gravitational co... |
1601.07516 | Farhad Darabi | K. Atazadeh, F. Darabi, M. Mousavi | Dark matter as the Bose-Einstein condensation in loop quantum cosmology | 16 pages, 2 figures, minor revision | Eur. Phys. J. C, 76 (2016) 327 | 10.1140/epjc/s10052-016-4182-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the FLRW universe in a loop quantum cosmological model filled
with the radiation, baryonic matter (with negligible pressure), dark energy and
dark matter. The dark matter sector is supposed to be of Bose-Einstein
condensate type. The Bose-Einstein condensation process in a cosmological
context by supposin... | [
{
"created": "Wed, 27 Jan 2016 19:35:28 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jan 2016 23:04:12 GMT",
"version": "v2"
},
{
"created": "Sun, 19 Jun 2016 14:19:45 GMT",
"version": "v3"
}
] | 2016-09-07 | [
[
"Atazadeh",
"K.",
""
],
[
"Darabi",
"F.",
""
],
[
"Mousavi",
"M.",
""
]
] | We consider the FLRW universe in a loop quantum cosmological model filled with the radiation, baryonic matter (with negligible pressure), dark energy and dark matter. The dark matter sector is supposed to be of Bose-Einstein condensate type. The Bose-Einstein condensation process in a cosmological context by supposing ... |
1107.5727 | Santiago Esteban Perez Bergliaffa | Santiago Esteban Perez Bergliaffa and Yves Eduardo Chifarelli de
Oliveira Nunes | Static and spherically symmetric black holes in $f(R)$ theories | null | null | 10.1103/PhysRevD.84.084006 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study some features of static and spherically symmetric solutions (SSS)
with a horizon in $f(R)$ theories of gravitation by means of a near-horizon
analysis. A necessary condition for an $f(R)$ theory to have this type of
solution is obtained. General features of the effective potential are deduced,
and it is show... | [
{
"created": "Thu, 28 Jul 2011 14:44:00 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"Bergliaffa",
"Santiago Esteban Perez",
""
],
[
"Nunes",
"Yves Eduardo Chifarelli de Oliveira",
""
]
] | We study some features of static and spherically symmetric solutions (SSS) with a horizon in $f(R)$ theories of gravitation by means of a near-horizon analysis. A necessary condition for an $f(R)$ theory to have this type of solution is obtained. General features of the effective potential are deduced, and it is shown ... |
1808.09971 | Benjamin Bahr | Benjamin Bahr | Volume of 4-polytopes from bivectors | 19 pages, 13 figures | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we prove a formula for the volume of 4-dimensional polytopes,
in terms of their face bivectors, and the crossings within their boundary
graph. This proves that the volume is an invariant of bivector-coloured graphs
in $S^3$.
| [
{
"created": "Wed, 29 Aug 2018 18:00:02 GMT",
"version": "v1"
}
] | 2018-08-31 | [
[
"Bahr",
"Benjamin",
""
]
] | In this article we prove a formula for the volume of 4-dimensional polytopes, in terms of their face bivectors, and the crossings within their boundary graph. This proves that the volume is an invariant of bivector-coloured graphs in $S^3$. |
gr-qc/9904076 | Takahiro Tanaka | Yoshiaki Himemoto and Takahiro Tanaka | Generalization of the model of Hawking radiation with modified high
frequency dispersion relation | 23 pages, 5 postscript figures, submitted to Physical Review D | Phys.Rev. D61 (2000) 064004 | 10.1103/PhysRevD.61.064004 | OU-TAP 99 | gr-qc | null | The Hawking radiation is one of the most interesting phenomena predicted by
the theory of quantum field in curved space. The origin of Hawking radiation is
closely related to the fact that a particle which marginally escapes from
collapsing into a black hole is observed at the future infinity with infinitely
large re... | [
{
"created": "Thu, 29 Apr 1999 10:14:27 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Sep 1999 15:21:16 GMT",
"version": "v2"
},
{
"created": "Wed, 29 Sep 1999 06:52:45 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Himemoto",
"Yoshiaki",
""
],
[
"Tanaka",
"Takahiro",
""
]
] | The Hawking radiation is one of the most interesting phenomena predicted by the theory of quantum field in curved space. The origin of Hawking radiation is closely related to the fact that a particle which marginally escapes from collapsing into a black hole is observed at the future infinity with infinitely large reds... |
1905.00446 | Qingwen Wang | Qingwen Wang, Naritaka Oshita, Niayesh Afshordi | Echoes from Quantum Black Holes | 9 pages, 8 figures, comments are welcome | Phys. Rev. D 101, 024031 (2020) | 10.1103/PhysRevD.101.024031 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the most triumphant predictions of the theory if general relativity
was the recent LIGO-Virgo detection of gravitational wave (GW) signals produced
in binary black hole (BH) mergers. However, it is suggested that exotic compact
objects, proposed in quantum gravity models of BHs, may produce similar
classical G... | [
{
"created": "Wed, 1 May 2019 18:44:14 GMT",
"version": "v1"
},
{
"created": "Thu, 30 May 2019 18:29:06 GMT",
"version": "v2"
}
] | 2020-01-15 | [
[
"Wang",
"Qingwen",
""
],
[
"Oshita",
"Naritaka",
""
],
[
"Afshordi",
"Niayesh",
""
]
] | One of the most triumphant predictions of the theory if general relativity was the recent LIGO-Virgo detection of gravitational wave (GW) signals produced in binary black hole (BH) mergers. However, it is suggested that exotic compact objects, proposed in quantum gravity models of BHs, may produce similar classical GW ... |
2407.14035 | Chen-Kai Qiao | Chen-Kai Qiao | The Existence and Distribution of Photon Spheres Near Spherically
Symmetric Black Holes -- A Geometric Analysis | 18+2 pages, 10+1 figures, 4 Appendices V2: some references added | null | null | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Photon sphere has attracted significant attention since the discovery of
black hole shadow images by Event Horizon Telescope. Recently, a number of
studies have highlighted that the number of photon spheres and their
distributions near black holes are strongly constrained by black hole
properties. Specifically, for b... | [
{
"created": "Fri, 19 Jul 2024 05:19:04 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Aug 2024 17:45:51 GMT",
"version": "v2"
}
] | 2024-08-02 | [
[
"Qiao",
"Chen-Kai",
""
]
] | Photon sphere has attracted significant attention since the discovery of black hole shadow images by Event Horizon Telescope. Recently, a number of studies have highlighted that the number of photon spheres and their distributions near black holes are strongly constrained by black hole properties. Specifically, for bla... |
1706.08848 | Hongsheng Zhang | Hongsheng Zhang, Yi Zhang, Xin-Zhou Li | Dynamical spacetimes in conformal gravity | 13 pages, no fig | Nuclear Physics B, Volume 921, August 2017, Pages 522-537 | 10.1016/j.nuclphysb.2017.05.011 | null | gr-qc hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | The conformal gravity remarkably boosts our prehension of gravity theories.
We find a series of dynamical solutions in the $W^2$-conformal gravity,
including generalized Schwarzschild-Friedmann-Robertson-Walker (GSFRW), charged
generalized Schwarzschild-Friedmann-Robertson-Walker (CGSFRW), especially
rotating Friedma... | [
{
"created": "Mon, 26 Jun 2017 02:49:25 GMT",
"version": "v1"
}
] | 2017-06-28 | [
[
"Zhang",
"Hongsheng",
""
],
[
"Zhang",
"Yi",
""
],
[
"Li",
"Xin-Zhou",
""
]
] | The conformal gravity remarkably boosts our prehension of gravity theories. We find a series of dynamical solutions in the $W^2$-conformal gravity, including generalized Schwarzschild-Friedmann-Robertson-Walker (GSFRW), charged generalized Schwarzschild-Friedmann-Robertson-Walker (CGSFRW), especially rotating Friedmann... |
1306.0820 | Julio Cesar Fabris | N. Pinto-Neto, J.C. Fabris | Quantum cosmology from the de Broglie-Bohm perspective | Latex file, 75 pages, 3 figures in eps format. To appear in CQG as an
invited Topical Review | null | 10.1088/0264-9381/30/14/143001 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the main results that have been obtained in quantum cosmology from
the perspective of the de Broglie-Bohm quantum theory. As it is a dynamical
theory of assumed objectively real trajectories in the configuration space of
the physical system under investigation, this quantum theory is not essentially
probabi... | [
{
"created": "Tue, 4 Jun 2013 14:52:44 GMT",
"version": "v1"
}
] | 2015-06-16 | [
[
"Pinto-Neto",
"N.",
""
],
[
"Fabris",
"J. C.",
""
]
] | We review the main results that have been obtained in quantum cosmology from the perspective of the de Broglie-Bohm quantum theory. As it is a dynamical theory of assumed objectively real trajectories in the configuration space of the physical system under investigation, this quantum theory is not essentially probabili... |
1805.01405 | Klaus Kroencke | David Fajman, Klaus Kroencke | On the CMC-Einstein-Lambda flow | 12 pages, published version. Parts of this paper appeared in the
first version of arXiv:1504.00687 | Class. Quantum Grav. 35 (2018) no. 19, 195005 | 10.1088/1361-6382/aad843 | null | gr-qc math.AP math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We complement a recent work on the stability of fixed points of the
CMC-Einstein-$\Lambda$ flow. In particular, we modify the utilized gauge for
the Einstein equations and remove a restriction on the fixed points whose
stability we are able to prove by this method, and thereby generalize the
stability result. In addi... | [
{
"created": "Thu, 3 May 2018 16:21:06 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Sep 2018 13:29:36 GMT",
"version": "v2"
}
] | 2018-09-10 | [
[
"Fajman",
"David",
""
],
[
"Kroencke",
"Klaus",
""
]
] | We complement a recent work on the stability of fixed points of the CMC-Einstein-$\Lambda$ flow. In particular, we modify the utilized gauge for the Einstein equations and remove a restriction on the fixed points whose stability we are able to prove by this method, and thereby generalize the stability result. In additi... |
0912.5015 | Brian Smtih | Brian Smith | Black hole initial data with a horizon of prescribed intrinsic and
extrinsic geometry | to appear in Contemporary Mathematics | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The purpose of this work is to construct asymptotically flat, time symmetric
initial data with an apparent horizon of prescribed intrinsic and extrinsic
geometry. To do this, we use the parabolic partial differential equation for
prescribing scalar curvature. In this equation the horizon geometry is
contained within ... | [
{
"created": "Sat, 26 Dec 2009 12:51:28 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Jun 2010 10:22:32 GMT",
"version": "v2"
}
] | 2010-06-15 | [
[
"Smith",
"Brian",
""
]
] | The purpose of this work is to construct asymptotically flat, time symmetric initial data with an apparent horizon of prescribed intrinsic and extrinsic geometry. To do this, we use the parabolic partial differential equation for prescribing scalar curvature. In this equation the horizon geometry is contained within th... |
gr-qc/0210091 | A. N. Ivanov | A. N. Ivanov, A. P. Kobushkin, M. Wellenzohn | Storage rings as detectors for relic gravitational-wave background ? | 10 pages, 1 figure,All results of this manuscript have been delivered
online at ARIES WP6 Workshop: Storage Rings and Gravitational Waves
"SRGW2021", held from 2.02.2021 to 31.03.2021 and organized by CERN, Geneva
Switzerland | null | null | null | gr-qc astro-ph hep-ex hep-ph hep-th physics.acc-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that storage rings can be used for the detection of low-frequency
gravitational-wave background. We explain the systematic shrinkage of the
machine circumference of the storage ring of the SPring-8, observed by Takao
and Shimada (Proceedings of EPAC 2000, Vienna, 2000, p.1572), by the influence
of the relic ... | [
{
"created": "Sun, 27 Oct 2002 09:29:25 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Nov 2002 15:28:14 GMT",
"version": "v2"
},
{
"created": "Tue, 10 Dec 2002 18:44:55 GMT",
"version": "v3"
},
{
"created": "Mon, 23 Jun 2003 17:52:57 GMT",
"version": "v4"
},
{
"cr... | 2021-03-31 | [
[
"Ivanov",
"A. N.",
""
],
[
"Kobushkin",
"A. P.",
""
],
[
"Wellenzohn",
"M.",
""
]
] | We argue that storage rings can be used for the detection of low-frequency gravitational-wave background. We explain the systematic shrinkage of the machine circumference of the storage ring of the SPring-8, observed by Takao and Shimada (Proceedings of EPAC 2000, Vienna, 2000, p.1572), by the influence of the relic gr... |
1509.07358 | Muhammad Sharif | M. Sharif and Rabia Saleem | Inflationary Weak Anisotropic Model with General Dissipation Coefficient | 24 pages, 12 figures. arXiv admin note: text overlap with
arXiv:1312.3502 by other authors | Astrophys. Space Sci. 361(2016)107 | 10.1007/s10509-016-2698-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper explores the dynamics of warm intermediate and logamediate
inflationary models during weak dissipative regime with a general form of
dissipative coefficient. We analyze these models within the framework of
locally rotationally symmetric Bianchi type I universe. In both cases, we
evaluate solution of inflat... | [
{
"created": "Tue, 15 Sep 2015 10:14:51 GMT",
"version": "v1"
}
] | 2016-03-23 | [
[
"Sharif",
"M.",
""
],
[
"Saleem",
"Rabia",
""
]
] | This paper explores the dynamics of warm intermediate and logamediate inflationary models during weak dissipative regime with a general form of dissipative coefficient. We analyze these models within the framework of locally rotationally symmetric Bianchi type I universe. In both cases, we evaluate solution of inflaton... |
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