Non-gaussianity for a Two Component Hybrid Model of Inflation

Abstract

We consider a two component hybrid inflation model, in which two fields drive inflation. Our results show that this model generates an observable non-gaussian contribution to the curvature spectrum, within the limits allowed by the recent WMAP year 3 data. We show that if one field has a mass less than zero, and an initial field value less than 0.06Mpl while the other field has a mass greater than zero, and initial field value ranging between 0.5Mpl and Mpl then the non-gaussianity is observable with 1<fnl<1.5, but that fnl becomes much less than the observable limit should we take both masses to have the same sign, or if we loosened the constraints on the initial field values.

arXiv comment10 pages and 5 figures. More extensive analysis of model, which shows that observable fnl is possible

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