298 citations · 1.2k across the 34 of their papers we have counts for
34 papers
Radiating Spherical Collapse for an Inhomogeneous Interior Solution
Eduardo Bittencourt, Vanessa P Freitas, José M Salim +1
We analyze the problem of gravitational collapse considering the matching of an exterior region described by the Vaidya's metric and an interior region described by a spherically s…
Stability of the accretion of a ghost condensate onto the Schwarzschild black hole
Claudia A. Rivasplata Paz, Jose Martins Salim, Santiago Esteban Perez Bergliaffa
We study the linear stability of a nongravitating, steady-state, spherically symmetric ghost condensate accreting onto a Schwarzschild black hole using two methods. The first one i…
Magnetic fields and the Weyl tensor in the early universe
Eduardo Bittencourt, José Salim, Grasiele B. dos Santos
We have solved the Einstein-Maxwell equations for a class of isotropic metrics with constant spatial curvature in the presence of magnetic fields. We consider a slight modification…
Analogue black holes for light rays in static dielectrics
E. Bittencourt, V. A. De Lorenci, R. Klippert +2
Propagation of light in nonlinear materials is here studied in the regime of the geometrical optics. It is shown that a spherically symmetric medium at rest with some specific diel…
Scalar perturbations in a Friedmann-like metric with non-null Weyl tensor
Grasiele B. Santos, Eduardo Bittencourt, José M. Salim
In a previous work the authors have solved the Einstein equations of General Relativity for a class of metrics with constant spatial curvature, where it was found a non vanishing W…
Weyl geometry and gauge-invariant gravitation
F. P. Poulis, J. M. Salim
We provide a gauge-invariant theory of gravitation in the context of Weyl Integrable Space-Times. After making a brief review of the theory's postulates, we carefully define the ob…