Abstract
We perform a general study of primordial scalar non-Gaussianities in single-fieldinflationary models in Einstein gravity. We consider models where the inflaton Lagrangianis an arbitrary function of the scalar field and its first derivative, and the sound speed isarbitrary. We find that under reasonable assumptions, the non-Gaussianity iscompletely determined by five parameters. In special limits of the parameter space, onefinds distinctive ‘shapes’ of the non-Gaussianity. In models with a small soundspeed, several of these shapes would become potentially observable in the nearfuture. Different limits of our formulae recover various previously known results.
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