Curvaton and the inhomogeneous end of inflation

Abstract

We study the primordial density perturbations and non-Gaussianities generated from the combined effects of an inhomogeneous end of inflation and curvaton decay in hybrid inflation. This dual role is played by a single isocurvature field which is massless during inflation but acquire a mass at the end of inflation via the waterfall phase transition. We calculate the resulting primordial non-Gaussianity characterized by the non-linearity parameter, $f_{NL}$, recovering the usual end-of-inflation result when the field decays promptly and the usual curvaton result if the field decays sufficiently late.

13 pages, 5 figures

References in corpus (9)

• Multi-brid inflation and non-Gaussianity
• Scale-dependent non-Gaussianity probes inflationary physics
• A numerical study of non-gaussianity in the curvaton scenario
• Large non-Gaussianity from multi-brid inflation
• Primordial non-Gaussianity from two curvaton decays
• The Trispectrum in the Multi-brid Inflation
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• Non-Gaussianity and Gravitational Waves from Quadratic and Self-interacting Curvaton
• Statistically anisotropic curvature perturbation generated during the waterfall

Cited by in corpus (11)

• Hemispherical Asymmetry and Local non-Gaussianity: a Consistency Condition
• Primordial Anisotropies in Gauged Hybrid Inflation
• Modulated curvaton decay
• General analytic predictions of two-field inflation and perturbative reheating
• \bf $\delta M$ Formalism: A New Approach to Cosmological Perturbation Theory in Anisotropic Inflation
• Non-Gaussianity in the inflating curvaton
• Hubble multi-scalar inflation
• Modulated decay in the multi-component Universe
• What Planck does not tell us about inflation
• The Effect of Curvaton Decay on the Primordial Power Spectrum
• Spectator fields and their imprints on the Cosmic Microwave Background