Abstract
Light scalar fields present during inflation can lead to interesting observable signatures, especially in models with nonequilibrium reheating dynamics. We study a supersymmetric hybrid inflation model with a third scalar whose lightness is protected by symmetry, using analytical and numerical techniques, and demonstrate that the amplitude, the spectral index and the non-Gaussianity parameter ${f}_{\mathrm{NL}}$ of the primordial curvature perturbation are within the Planck observational bounds for suitable parameter values.
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