  We compute the one loop self energy, in a locally de Sitter background, for a
massless fermion which is Yukawa-coupled to a massless, minimally coupled
scalar. We then solve the modified Dirac equation resulting from inclusion of
the self energy. We find faster-than-exponential growth in the fermion wave
function, consistent with the production of fermions through a process in which
a scalar and a fermion-anti-fermion pair are ripped out of the vacuum by
inflation.
