184 citations · 296 across the 4 of their papers we have counts for
4 papers
Bulk Viscous Cosmology
R. Colistete, J. C. Fabris, J. Tossa +1
We propose a scenario in which the dark components of the Universe are manifestations of a single bulk viscous fluid. Using dynamical system methods, a qualitative study of the hom…
The dynamics of the early universe and the initial conditions for inflation in a model with radiation and a Chaplygin gas
G. A. Monerat, G. Oliveira-Neto, E. V. Corrêa Silva +6
The modeling of the early universe is done through the quantization of a Friedmann-Robertson-Walker model with positive curvature. The material content consists of two fluids: radi…
Density Perturbations for Running Cosmological Constant
Julio C. Fabris, Ilya L. Shapiro, Joan Sola
The dynamics of density and metric perturbations is investigated for the previously developed model where the decay of the vacuum energy into matter (or vice versa) is due to the r…
Scalar Perturbations and Conformal Transformation
Julio C. Fabris, Joel Tossa
The non-minimal coupling of gravity to a scalar field can be transformed into a minimal coupling through a conformal transformation. We show how to connect the results of a perturb…