Non-Gaussianity in the inflating curvaton

Abstract

Inflating curvaton can create curvature perturbation when the curvaton density is slowly varying. Using the delta-N formalism, we discuss the evolution of the curvature perturbation during curvaton inflation and find analytic formulation of the non-Gaussianity parameter. We first consider the inflating curvaton with sufficiently long inflationary expansion. Then we compare the result with short curvaton inflation.

Comments: 13 pages, 2 figures, title changed, added calculational details, readable, errors corrected, to appear in PRD