Results 41 to 50 of about 2,770 (52)
, 2004 We investigate in detail the special case of an infinitely thin static cylindrical shell composed of counter-rotating photons on circular geodetical paths separating two distinct parts of Minkowski spacetimes--one inside and the other outside the shell ...
Bi?ák J +8 more
core +1 more source
Viscous Dark Energy Models with Variable G and Lambda
, 2007 We consider a cosmological model with bulk viscosity ($\eta$) and variable cosmological $(\Lambda\propto \rho^{-\alpha}, \alpha=\rm const.$) and gravitational ($G$) constants. The model exhibits many interesting cosmological features.
Arbab A I +4 more
core +1 more source
On the integrability of halo dipoles in gravity
, 1996 We stress that halo dipole components are nontrivial in core-halo systems in both Newton's gravity and General Relativity. To this end, we extend a recent exact relativistic model to include also a halo dipole component. Next, we consider orbits evolving
Grammaticos +3 more
core +2 more sources
Construction of 3D wormhole supported by phantom energy
, 2007 In this article, we have found a series solution of 3D Einstein equations describing a wormhole for an inhomogeneous distribution of phantom energy. Here, we assume equation of state is linear but highly anistropic.Comment: 9 papge, 4 figures.
Alcubierre M +13 more
core +1 more source
, 1996 A recent paper [M. Kamata and T. Koikawa, Phys. Lett. {\bf B353} (1995) 196.] claimed to obtain the charged version of the $(2+1)$-dimensional spinning $BTZ$ black hole solution by assuming a (anti-) self dual condition imposed on the electric and ...
Bañados +10 more
core +1 more source
Chaos around a H\'enon-Heiles-inspired exact perturbation of a black hole
, 1996 A solution of the Einstein's equations that represents the superposition of a Schwarszchild black hole with both quadrupolar and octopolar terms describing a halo is exhibited.
A. P. Fordy +11 more
core +2 more sources
The Atmosphere of a Black Hole
, 2016 We present a static, isotropic fluid solution around a black hole and its effects on the field equations and the horizon. We offer the solutions, their descriptions and we comment on their shortcomings. We derive from the proposed metric the density, the
Arik, Metin, Senikoglu, Yorgo
core +1 more source
, 2007 A geometric flow based in the Riemann-Christoffel curvature tensor that in two dimensions has some common features with the usual Ricci flow is presented.
Letelier, Patricio S.
core +1 more source
Geodesics in the static Mallett spacetime
, 2010 Mallett has exhibited a cylindrically symmetric spacetime containing closed timelike curves produced by a light beam circulating around a line singularity.
Ken D. Olum, R. L. Mallett
core +1 more source