Revisiting non-Gaussianity in multifield inflation with curved field space

Understand

Recent studies of inflation with multiple scalar fields have highlighted the importance of non-canonical kinetic terms in novel types of inflationary solutions.

• This motivates a thorough analysis of non-Gaussianities in this context, which we revisit here by studying the primordial bispectrum in a general two-field model.
• Our main result is the complete cubic action for inflationary fluctuations written in comoving gauge, i.e.
• in terms of the curvature perturbation and the entropic mode.