On the Stability of a class of Modified Gravitational Models
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Motivated by the dark energy issue, a minisuperspace approach to the stability for modified gravitational models in a four dimensional cosmological setting are investigated. Specifically, after revisiting the $f(R)$ case, $R$ being the Ricci curvature, we present a stability condition around a de Sitter solution valid for modified gravitational models of generalized Gauss-Bonnet type $F(R,G,Q)$, $G$ and $Q$ being the Gauss-Bonnet and quadratic Riemann invariants respectively. A generalization to higher order invariants is mentioned.
latex, 13 pag., no figures. Major revision, an additional Section added with new ewsults. New references added
latex, 13 pag., no figures. Major revision, an additional Section added with new ewsults. New references added