Modulated curvaton decay

Abstract

We study primordial density perturbations generated by the late decay of a curvaton field whose decay rate may be modulated by the local value of another isocurvature field, analogous to models of modulated reheating at the end of inflation. We calculate the primordial density perturbation and its local-type non-Gaussianity using the sudden-decay approximation for the curvaton field, recovering standard curvaton and modulated reheating results as limiting cases. We verify the Suyama-Yamaguchi inequality between bispectrum and trispectrum parameters for the primordial density field generated by multiple field fluctuations, and find conditions for the bound to be saturated.

16 pages, 8 figures

References in corpus (10)

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• General analytic predictions of two-field inflation and perturbative reheating
• Density Perturbations from Modulated Decay of the Curvaton
• Planck constraints on Higgs modulated reheating of renormalization group improved inflation
• Scale-dependent CMB asymmetry from primordial configuration
• Implications of Planck results for models with local type non-Gaussianity
• Modulated decay in the multi-component Universe
• Quadratic Isocurvature Cross-Correlation, Ward Identity, and Dark Matter
• What Planck does not tell us about inflation
• Primordial inhomogeneities from massive defects during inflation
• Thermal Effects and Sudden Decay Approximation in the Curvaton Scenario
• Inflationary buildup of a vector field condensate and its cosmological consequences
• Delta-N Formalism for Curvaton with Modulated Decay
• Thermal Inflation with a Thermal Waterfall Scalar Field Coupled to a Light Spectator Scalar Field
• Spectator fields and their imprints on the Cosmic Microwave Background
• Towards an analytic solution of rapid roll inflation with a quartic potential