Non-singular Universes à la Palatini

Gonzalo J Olmo
2011 Journal of Physics, Conference Series  
It has recently been shown that f(R) theories formulated in the Palatini variational formalism are able to avoid the big bang singularity yielding instead a bouncing solution. The mechanism responsible for this behavior is similar to that observed in the effective dynamics of loop quantum cosmology and an f(R) theory exactly reproducing that dynamics has been found. I will show here that considering more general actions, with quadratic contributions of the Ricci tensor, results in a much richer
more » ... phenomenology that yields bouncing solutions even in anisotropic (Bianchi I) scenarios. Some implications of these results are discussed.
doi:10.1088/1742-6596/314/1/012054 fatcat:37cm3jltjbccddchq3rx2y462e