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Light scalar fields present during inflation can lead to interestingobservable signatures, especially in models with non-equilibrium reheatingdynamics. We study a supersymmetric hybrid inflation model with a third scalarwhose lightness is protected by symmetry, using analytical and numericaltechniques, and demonstrate that the amplitude, the spectral index and thenon-Gaussianity parameter fNL of the primordial curvature perturbation arewithin the Planck observational bounds for suitable parameter values.

Supersymmetric hybrid inflation with a light scalar