%0 Journal Article
%T Bouncing universes in scalar-tensor gravity models admitting negative potentials
%+ Laboratoire de Mathématiques et Physique Théorique (LMPT)
%+ Laboratoire Charles Coulomb (L2C)
%A Boisseau, B.
%A Giacomini, H.
%A Polarski, David
%A Starobinsky, A. A.
%< avec comité de lecture
%Z L2C:15-160
%@ 1475-7508
%J Journal of Cosmology and Astroparticle Physics
%I Institute of Physics (IOP)
%V 2015
%N 7
%P 002
%8 2015-07-06
%D 2015
%R 10.1088/1475-7516/2015/07/002
%K modified gravity
%K cosmic singularity
%K dark energy theory
%Z Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO]Journal articles
%X 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.
%G English
%L hal-01203042
%U https://hal.science/hal-01203042
%~ UNIV-TOURS
%~ CNRS
%~ L2C
%~ LMPT
%~ MIPS
%~ UNIV-MONTPELLIER
%~ IDP
%~ UM-2015-2021
%~ TEST3-HALCNRS