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Bouncing universes in scalar-tensor gravity models admitting negative potentials

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.
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Submitted on : Tuesday, September 22, 2015 - 11:14:30 AM
Last modification on : Tuesday, January 11, 2022 - 5:56:09 PM

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B. Boisseau, H. Giacomini, David Polarski, A. A. Starobinsky. Bouncing universes in scalar-tensor gravity models admitting negative potentials. Journal of Cosmology and Astroparticle Physics, Institute of Physics (IOP), 2015, 2015 (7), pp.002. ⟨10.1088/1475-7516/2015/07/002⟩. ⟨hal-01203042⟩



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