Curvature perturbation and waterfall dynamics in hybrid inflation

Abstract

We investigate the parameter spaces of hybrid inflation model with special attention paid to the dynamics of waterfall field and curvature perturbations induced from its quantum fluctuations. Depending on the inflaton field value at the time of phase transition and the sharpness of the phase transition inflation can have multiple extended stages. We find that for models with mild phase transition the induced curvature perturbation from the waterfall field is too large to satisfy the COBE normalization. We investigate the model parameter space where the curvature perturbations from the waterfall quantum fluctuations vary between the results of standard hybrid inflation and the results obtained here.

V2: Minor revisions, references added, JCAP published version

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• Primordial Anisotropies in Gauged Hybrid Inflation
• Lagrangian Formulation of Stochastic Inflation: A Recursive Approach
• Curvature perturbation spectra from waterfall transition, black hole constraints and non-Gaussianity
• A Density Spike on Astrophysical Scales from an N-Field Waterfall Transition
• Local Features with Large Spiky non-Gaussianities during Inflation
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• Primordial black hole formation and hybrid inflation
• Density Perturbations in Hybrid Inflation Using a Free Field Theory Time-Delay Approach
• An Inflationary Probe of Cosmic Higgs Switching
• Primordial black hole formation from non-Gaussian curvature perturbations
• Effects of Variable Newton Constant During Inflation