Identification of perturbation modes and controversies in ekpyrotic perturbations

Details Identification of perturbation modes and controversies in ekpyrotic perturbations Identification of perturbation modes and controversies in ekpyrotic perturbations

2002-03-21

arxiv.org/abs/hep-th/0203193v2

Phys.Lett. B545 (2002) 207-213

Physics

High Energy Physics

High Energy Physics - Theory

5 pages, substantially revised, match with PLB version

Scientific paper

10.1016/S0370-2693(02)02598-4

If the linear perturbation theory is valid through the bounce, the surviving fluctuations from the ekpyrotic scenario (cyclic one as well) should have very blue spectra with suppressed amplitude for the scalar-type structure. We derive the same (and consistent) result using the curvature perturbation in the uniform-field (comoving) gauge and in the zero-shear gauge. Previously, Khoury et al. interpreted results from the latter gauge condition incorrectly and claimed the scale-invariant spectrum, thus generating controversy in the literature. We also correct similar errors in the literature based on wrong mode identification and joining condition. No joining condition is needed for the derivation.

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