Bouncing Cosmologies in Palatini $f(R)$ Gravity

Details Bouncing Cosmologies in Palatini $f(R)$ Gravity Bouncing Cosmologies in Palatini $f(R)$ Gravity

2009-07-02

arxiv.org/abs/0907.0318v2

Phys.Rev.D80:024016,2009

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

8 pages, 4 figures; added references and a short comment in sec.IV

Scientific paper

10.1103/PhysRevD.80.024016

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. We also find that power-law lagrangians with a finite number of terms may lead to non-singular universes, which contrasts with the infinite-series Palatini f(R) lagrangian that one needs to fully capture the effective dynamics of Loop Quantum Cosmology. We argue that these models could also avoid the formation of singularities during stellar gravitational collapse.

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