Abstract
Motivated by the dark energy issue, a minisuperspace approach to the stability for modified gravitational models in a four dimensional cosmological setting is 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 type F(R,G,Q), G and Q being the Gauss-Bonnet and quadratic Riemann invariants respectively. A generalization to higher order invariants is presented.
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Cognola, G., Gastaldi, M. & Zerbini, S. On the Stability of a Class of Modified Gravitational Models. Int J Theor Phys 47, 898–910 (2008). https://doi.org/10.1007/s10773-007-9516-x
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DOI: https://doi.org/10.1007/s10773-007-9516-x