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Clarifying perturbations in the ekpyrotic universe

Year 2001
Description 3 p.
Abstract 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.
Stable URL http://archive-ouverte.unige.ch/unige:1026
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