COT3 - Nonsingular Cosmology |
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Speaker |
Olmo Alba, Gonzalo |
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Co-autors |
Carlos Barragán, Hèlios Sanchis-Alepuz |
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Talk Title |
Avoiding the Big Bang singularity with Palatini f(R) theories. |
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Abstract |
We discuss the conditions that guarantee the existence of homogeneous and isotropic models that avoid the Big Bang singularity in $f(R)$ theories in Palatini formalism. 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 presureless 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. |
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