Scale-dependence of Non-Gaussianity in the Curvaton Model

Abstract

We investigate the scale-dependence of f_NL in the self-interacting curvaton model. We show that the scale-dependence, encoded in the spectral index n_{f_NL}, can be observable by future cosmic microwave background observations, such as CMBpol, in a significant part of the parameter space of the model. We point out that together with information about the trispectrum g_NL, the self-interacting curvaton model parameters could be completely fixed by observations. We also discuss the scale-dependence of g_NL and its implications for the curvaton model, arguing that it could provide a complementary probe in cases where the theoretical value of n_{f_NL} is below observational sensitivity.

14 pages, 5 figures, Eq.(10) corrected

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Cited by in corpus (14)

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• On Classification of Models of Large Local-Type Non-Gaussianity
• Inflation in Entropic Cosmology: Primordial Perturbations and non-Gaussianities
• Strongly Scale-dependent Non-Gaussianity
• Scale-Dependent Non-Gaussianity as a Generalization of the Local Model
• Negative spectral index of $f_{NL}$ in the axion-type curvaton model
• Non-Gaussianity and Gravitational Waves from Quadratic and Self-interacting Curvaton
• Optimizing future experimental probes of inflation
• Primordial Trispectrum from Isocurvature Fluctuations
• Tilt and Running of Cosmological Observables in Generalized Single-Field Inflation
• Scale dependence of $f_{NL}$ in N-flation
• Non-Gaussianity and gravitational wave background in curvaton with a double well potential
• New features in curvaton model
• Affleck-Dine baryogenesis with modulated reheating