Bouncing cosmology in f(R , G) gravity by order reduction
Abstract
A bouncing universe is a viable candidate to solve the initial singularity problem. Here we consider bouncing solutions in the context of f(R , G) gravity by using an order reduction technique which allows one to find solutions that are perturbatively close to General Relativity. This procedure also acts as a model selection approach. Indeed, several covariant gravitational actions leading to a bounce are directly selected by demanding that the Friedmann equation derived within such gravity theories coincides with the one emerging from Loop Quantum Cosmology.
 Publication:

Annals of Physics
 Pub Date:
 August 2020
 DOI:
 10.1016/j.aop.2020.168231
 arXiv:
 arXiv:1907.11732
 Bibcode:
 2020AnPhy.41968231B
 Keywords:

 General Relativity and Quantum Cosmology;
 Astrophysics  Cosmology and Nongalactic Astrophysics;
 High Energy Physics  Theory
 EPrint:
 v1: 7 pages