Clarifying perturbations in the ekpyrotic universe
classification
✦ hep-th
astro-ph
keywords
ekpyroticperturbationsproblemuniversealwaysbringchoicesclarify
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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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