Scalar perturbations in regular two-component bouncing cosmologies

Details Scalar perturbations in regular two-component bouncing cosmologies Scalar perturbations in regular two-component bouncing cosmologies

2005-02-03

arxiv.org/abs/hep-th/0502047v2

Phys.Lett. B625 (2005) 177-183

Physics

High Energy Physics

High Energy Physics - Theory

10 pages, 1 figure

Scientific paper

10.1016/j.physletb.2005.08.052

We consider a two-component regular cosmology bouncing from contraction to expansion, where, in order to include both scalar fields and perfect fluids as particular cases, the dominant component is allowed to have an intrinsic isocurvature mode. We show that the spectrum of the growing mode of the Bardeen potential in the pre-bounce is never transferred to the dominant mode of the post-bounce. The latter acquires at most a dominant isocurvature component, depending on the relative properties of the two fluids. Our results imply that several claims in the literature need substantial revision.

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