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.

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

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Cited by in corpus (11)

• The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe
• Primordial black holes in the curvaton model: possible connections to pulsar timing arrays and dark matter
• Comprehensive analysis of the simplest curvaton model
• Inflation with an extra light scalar field after Planck
• General analytic predictions of two-field inflation and perturbative reheating
• Scale-dependent CMB asymmetry from primordial configuration
• Modulated decay in the multi-component Universe
• Ambiguity in running spectral index with an extra light field during inflation
• Revised $f_{\mathrm{NL}}$ parameter in Curvaton Scenario
• What we can learn from the spectral index of the tensor mode
• Inflationary cross-correlations of a non-minimal spectator and their soft limits