Bouncing Universes in Scalar-Tensor Gravity Models admitting Negative Potentials
General Relativity and Quantum Cosmology
2015-07-15 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 models in which the scalar field potential may be negative, and even unbounded from below. We find a set of viable solutions with nonzero measure in the space of initial conditions passing a bounce, even in the presence of a radiation component, and approaching a constant gravitational coupling afterwards. Hence we have a model with a minimal modification of gravity in order to produce a bounce in the early universe with gravity tending dynamically to general relativity (GR) after the bounce.
Cite
@article{arxiv.1504.07927,
title = {Bouncing Universes in Scalar-Tensor Gravity Models admitting Negative Potentials},
author = {B. Boisseau and H. Giacomini and D. Polarski and A. A. Starobinsky},
journal= {arXiv preprint arXiv:1504.07927},
year = {2015}
}
Comments
12 pages, Improved presentation with 4 figures, Results and conclusions unchanged