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Bouncing Universes in Scalar-Tensor Gravity Around Conformal Invariance

Abstract : We consider the possibility to produce a bouncing universe in the framework of scalar-tensor gravity when the scalar field has a nonconformal coupling to the Ricci scalar. We prove that bouncing universes regular in the future with essentially the same dynamics as for the conformal coupling case do exist when the coupling deviates slightly from it. This is found numerically for more substantial deviations as well. In some cases however new features are found like the ability of the system to leave the effective phantom regime.
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Contributor : Hector Giacomini <>
Submitted on : Wednesday, March 23, 2016 - 3:18:20 PM
Last modification on : Friday, February 19, 2021 - 4:10:03 PM

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Boisseau Bruno, Hector Giacomini, David Polarski. Bouncing Universes in Scalar-Tensor Gravity Around Conformal Invariance. Journal of Cosmology and Astroparticle Physics, Institute of Physics (IOP), 2016, pp.1605, 037. ⟨10.1088/1475-7516/2016/05/048⟩. ⟨hal-01292660⟩



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