  This article investigates the generation of non-Gaussianity during inflation.
In the context of multi-field inflation, we detail a mechanism that can create
significant primordial non-Gaussianities in the adiabatic mode while preserving
the scale invariance of the power spectrum. This mechanism is based on the
generation of non-Gaussian isocurvature fluctuations which are then transfered
to the adiabatic modes through a bend in the classical inflaton trajectory.
Natural realizations involve quartic self-interaction terms for which a full
computation can be performed. The expected statistical properties of the
resulting metric fluctuations are shown to be the superposition of a Gaussian
and a non-Gaussian contribution of the same variance. The relative weight of
these two contributions is related to the total bending in field space. We
explicit the non-Gaussian probability distribution function which appears to be
described by a single new parameter. Only two new parameters therefore suffice
in describing the non-Gaussianity.
