Clarifying perturbations in the ekpyrotic universe

Details Clarifying perturbations in the ekpyrotic universe Clarifying perturbations in the ekpyrotic universe

2001-12-04

arxiv.org/abs/hep-th/0112026v2

Physics

High Energy Physics

High Energy Physics - Theory

3 pages, no figures Some typo's and a conceptial mistake corrected. Conclusions unaltered

Scientific paper

In this note I try to clarify the problem of perturbations in the ekpyrotic
universe. I write down the most general matching conditions and specify the
choices taken by the two debating sides. I also bring up the problem of surface
stresses which always have to be present when a transition from a collapsing to
an expanding phase is made.

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