Bouncing Universes in Scalar-Tensor Gravity Around Conformal Invariance
General Relativity and Quantum Cosmology
2016-06-01 v2 Cosmology and Nongalactic Astrophysics
High Energy Physics - Theory
Abstract
We consider the possibility to produce a bouncing universe in the framework of scalar-tensor gravity when the scalar field has a nonconformal coupling to the Ricci scalar. We prove that bouncing universes regular in the future with essentially the same dynamics as for the conformal coupling case do exist when the coupling deviates slightly from it. This is found numerically for more substantial deviations as well. In some cases however new features are found like the ability of the system to leave the effective phantom regime.
Cite
@article{arxiv.1603.06648,
title = {Bouncing Universes in Scalar-Tensor Gravity Around Conformal Invariance},
author = {B. Boisseau and H. Giacomini and D. Polarski},
journal= {arXiv preprint arXiv:1603.06648},
year = {2016}
}
Comments
15 pages, 13 figures; Added references, version to appear in JCAP