A Note on Perturbations During a Regular Bounce

Details A Note on Perturbations During a Regular Bounce A Note on Perturbations During a Regular Bounce

2005-06-16

arxiv.org/abs/hep-th/0506139v1

Phys.Rev. D73 (2006) 048501

Physics

High Energy Physics

High Energy Physics - Theory

3 pages

Scientific paper

We point out an inconsistency in a method used in the literature for studying adiabatic scalar perturbations in a regular bouncing universe (in four dimensions). The method under scrutiny consists of splitting the Bardeen potential into two pieces with independent evolutions, in order to avoid a singular behavior at the boundaries of the region where the null energy condition (NEC) is violated. However, we argue that this method violates energy-momentum conservation. We then introduce a novel method which provides two independent solutions for the Bardeen potential around the boundaries, even in the case of adiabatic perturbations. The two solutions are well behaved and not divergent.

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