Curvaton Dynamics and the Non-Linearity Parameters in Curvaton Model

Abstract

We investigate the curvaton dynamics and the non-linearity parameters in curvaton model with potential slightly deviating from the quadratic form in detail. The non-linearity parameter $g_{NL}$ will show up due to the curvaton self-interaction. We also point out that the leading order of non-quadratic term in the curvaton potential can be negative, for example in the axion-type curvaton model. If a large positive $g_{NL}$ is detected, the axion-type curvaton model will be preferred.

14 pages, 4 figures; refs added

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Cited by in corpus (7)

• Harrison--Zeldovich spectrum from conformal invariance
• Primordial Trispectrum from Entropy Perturbations in Multifield DBI Model
• Hilltop Non-Gaussianity
• Non-Gaussianity and Baryonic Isocurvature Fluctuations in the Curvaton Scenario
• The Trispectrum in the Multi-brid Inflation
• Non-Gaussianity from Baryon Asymmetry
• Curvature and Entropy Perturbations in Generalized Gravity