# Spectral Index and Non-Gaussianity in Supersymmetric Hybrid Inflation - High Energy Physics - Phenomenology

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Abstract: We consider a supersymmetric hybrid inflation model with two inflaton fields.The superpotential during inflation is dominated by W=\kappa S+\kappa- S-M^2,where S, S- are inflatons carrying the same U1 R charge, \kappa, \kappa- aredimensionless couplings, and M \sim 10^{15-16} GeV is a dimensionfulparameter associated with a symmetry breaking scale. One light mass eigenstatedrives inflation, while the other heavier mass eigenstate is stuck to theorigin. The smallness of the lighter inflaton mass for the scalar spectralindex n s\approx 0.96, which is the center value of WMAP7, can be controlled bythe ratio \kappa-\kappa through the supergravity corrections. We also discussthe possibility of the two field inflation and large non-Gaussianity in thissetup.

Autor: Bumseok Kyae

Fuente: https://arxiv.org/