G-Bounce

Details G-Bounce G-Bounce

2011-09-06

arxiv.org/abs/1109.1047v2

JCAP11(2011)021

Physics

High Energy Physics

High Energy Physics - Theory

28 pages. v2 reflects version accepted for publication in JCAP. References and minor comments added

Scientific paper

10.1088/1475-7516/2011/11/021

We present a wide class of models which realise a bounce in a spatially flat Friedmann universe in standard General Relativity. The key ingredient of the theories we consider is a noncanonical, minimally coupled scalar field belonging to the class of theories with Kinetic Gravity Braiding / Galileon-like self-couplings. In these models, the universe smoothly evolves from contraction to expansion, suffering neither from ghosts nor gradient instabilities around the turning point. The end-point of the evolution can be a standard radiation-domination era or an inflationary phase. We formulate necessary restrictions for Lagrangians needed to obtain a healthy bounce and illustrate our results with phase portraits for simple systems including the recently proposed Galilean Genesis scenario.

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