Non-Gaussianities in models with a varying inflaton decay rate

We consider the expected level of primordial non-Gaussianities in models in which density perturbations are produced by spatial fluctuations in the decay rate of the inflaton. We consider non-Gaussianities resulting from the self-coupling of the field that controls the decay rate of the inflaton and non-Gaussianities resulting from the nonlinear relation between field and curvature perturbations. We show that in these scenarios non-Gaussianities are of the local form, i.e., well described by the ansatz R=R-g+f(NL)(R)(R-g(2)-). This is a consequence of the fact that they were created when modes were already outside the horizon. We show that f(NL)(R) is naturally of the order of a few in these models, much larger than what is expected in the standard one field models of inflation (f(NL)(R)similar to10(-2)) and possibly accessible to observations.