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In the context of two-field inflation characterized by a light direction anda heavy direction, we revisit the question of the impact of the massive modeson the power spectrum produced after a turn in the inflationary trajectory. Weconsider in particular the resonant effect due to the background oscillationsfollowing a sharp turn. Working in the mass basis, i.e. in the basis spanned bythe eigenvectors of the effective mass matrix for the perturbations, we providean analytical estimate of the resonant effect, using the in-in formalism. Incomparison with earlier estimates, we find the same the spectral dependence buta smaller amplitude. We also compute, again via the in-in formalism, the effectof the direct coupling between the light and heavy modes at the instant of theturn and confirm our previous results obtained via a different method.

Oscillatory features in the curvature power spectrum after a sudden turn of the inflationary trajectory