Bouncing universes in scalar-tensor gravity models admitting negative potentials Auteur(s): Boisseau B., Giacomini H., Polarski D., Starobinsky A. A. (Article) Publié: Journal Of Cosmology And Astroparticle Physics, vol. 2015 p.002 (2015) Texte intégral en Openaccess : Ref HAL: hal-01203042_v1 DOI: 10.1088/1475-7516/2015/07/002 WoS: WOS:000359259500002 Exporter : BibTex | endNote 36 Citations Résumé: 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. |