Contribution of the hybrid inflation waterfall to the primordial curvature perturbation

Details Contribution of the hybrid inflation waterfall to the primordial curvature perturbation Contribution of the hybrid inflation waterfall to the primordial curvature perturbation

2010-12-21

arxiv.org/abs/1012.4617v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Simpler and more complete results, especiallly for delta N approach

Scientific paper

A contribution $\zeta_\chi$ to the curvature perturbation will be generated during the waterfall that ends hybrid inflation, that may be significant on small scales. In particular, it may lead to excessive black hole formation. We here consider standard hybrid inflation, where the tachyonic mass of the waterfall field is much bigger than the Hubble parameter. We calculate $\zeta_\chi$ in the simplest case, and see why earlier calculations of $\zeta_\chi$ are incorrect.

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