arXiv subjects

R. D. Boko

Publications and source records attributed to R. D. Boko.

2 recordsLinked to original sources

arXiv2016

Stability and Space Phase Analysis in f(R) theory with Generalized Exponential model

We have studied in this paper, the stability of dynamical system in $f(R)$ gravity. We have considered the $f(R)$ $γ$-gravity and explored its dynamical analysis. We found six critical points among which only one describes an universe fulled of both matter and dominated dark energy. It's shown that these critical points presents specific phase spaces described by the corresponding fluids. Furthermore, we've investigated the stability conditions of these critical points and find that theses conditions are dependent of the model parameters. We also study the stability of a new power-law $f_\ast(R)$ model with de Sitter and power law solutions.

gr-qc↗

arXiv2015

Isotropic turbulence in the dark fluid universe with inhomogeneous equation of state

We investigate the turbulence effect in dark fluid universe with linear inhomogeneous equation of state. Attention is attached to two physical situations. First, we perform the perturbative analysis of turbulence and check its effects around the Big Rip. Later, treating the turbulence energy density as a part of total dark fluid, we study the stability of the system. The result shows that the stability is achieving as the energy density of turbulence decreases, changing into heat (the radiation), in perfect agreement with the avoidance of the Big Rip.

gr-qc↗