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We study the production and backreaction of massive vector-like fermions inthe background of a classical SU(2) gauge field during axion-driven inflation.We demonstrate all ultraviolet divergences due to the interactions with thefermions can be absorbed by renormalization of the axion wavefunction and thegauge coupling. The effects of the fermion-axion interaction vanish in themassless limit as required by symmetry. For very massive fermions, contactinteractions are induced between the axion, the gauge field and thegravitational field. In this massive limit, we find the usual axion-gauge fieldinteractions are induced, however, in addition we observe the appearance ofaxion self-interactions, as well as kinetic braiding of the axion with theEinstein tensor. These new axion derivative interactions present intriguingopportunities for model building and phenomenology.

Production and backreaction of massive fermions during axion inflation with non-Abelian gauge fields