Bouncing universes in scalartensor gravity models admitting negative potentials
Abstract
We consider the possibility to produce a bouncing universe in the framework of scalartensor 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.
 Publication:

Journal of Cosmology and Astroparticle Physics
 Pub Date:
 July 2015
 DOI:
 10.1088/14757516/2015/07/002
 arXiv:
 arXiv:1504.07927
 Bibcode:
 2015JCAP...07..002B
 Keywords:

 General Relativity and Quantum Cosmology;
 Astrophysics  Cosmology and Nongalactic Astrophysics;
 High Energy Physics  Theory
 EPrint:
 12 pages, Improved presentation with 4 figures, Results and conclusions unchanged