  Light scalar fields present during inflation can lead to interesting
observable signatures, especially in models with non-equilibrium 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 fNL of the primordial curvature perturbation are
within the Planck observational bounds for suitable parameter values.

Cosmology and Nongalactic Astrophysics;High Energy Physics - Theory