Abstract
Galileon inflation is a radiatively stable higher derivativemodel of inflation. The model is determined by a finite numberof relevant operators which are protected by a covariantgeneralization of the Galileon shift symmetry.We show thatthe nongaussianity of the primordial density perturbationgenerated during an epoch of Galileon inflation isa particularly powerful observational probe of these modelsand that, when the speed of sound is small, fNL can be larger thanthe usual result fNL∝cs−2.
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