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We study a model of inflation where the scalar perturbations are almostgaussian while there is sizable (equilateral) nongaussianity in the tensorsector. In this model, a rolling pseudoscalar gravitationally coupled to theinflaton amplifies the vacuum fluctuations of a vector field. The vectorsources both scalar and tensor metric perturbations. Both kinds ofperturbations are nongaussian, but, due to helicity conservation, the tensorshave a larger amplitude, so that nongaussianity in the scalar perturbations isnegligible. Moreover, the tensors produced this way are chiral. We study, inthe flat sky approximation, how constraints on tensor nongaussianities affectthe detectability of parity violation in the Cosmic Microwave Background. Weexpect the model to feature interesting patterns on nongaussianities in thepolarization spectra of the CMB.

An inflationary model with small scalar and large tensor nongaussianities