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2009

Bouncing Cosmologies in Palatini $f(R)$ Gravity

Barragan, Carlos, Olmo, Gonzalo J., Sanchis-Alepuz, Helios

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We consider the early time cosmology of f(R) theories in Palatini formalism and study the conditions that guarantee the existence of homogeneous and isotropic models that avoid the Big Bang singularity.

We show that for such models the Big Bang singularity can be replaced by a cosmic bounce without violating any energy condition.
In fact, the bounce is possible even for pressureless dust.
We give a characterization of such models and discuss their dynamics in the region near the bounce.

Bouncing Cosmologies in Palatini $f(R)$ Gravity · Around

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