Density Perturbations in the Ekpyrotic Scenario

Details Density Perturbations in the Ekpyrotic Scenario Density Perturbations in the Ekpyrotic Scenario

2001-09-06

arxiv.org/abs/hep-th/0109050v4

Phys.Rev.D66:046005,2002

Physics

High Energy Physics

High Energy Physics - Theory

36 pages, compressed and RevTex file, one postscript figure file. Minor typographical and numerical errors corrected, discussi

Scientific paper

10.1103/PhysRevD.66.046005

We study the generation of density perturbations in the ekpyrotic scenario for the early universe, including gravitational backreaction. We expose interesting subtleties that apply to both inflationary and ekpyrotic models. Our analysis includes a detailed proposal of how the perturbations generated in a contracting phase may be matched across a `bounce' to those in an expanding hot big bang phase. For the physical conditions relevant to the ekpyrotic scenario, we re-obtain our earlier result of a nearly scale-invariant spectrum of energy density perturbations. We find that the perturbation amplitude is typically small, as desired to match observation.

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