  When models of new inflation are implemented in supergravity, the inflaton is
a complex and not a real scalar field. As a complex scalar field has two
independent components, supergravity models of new inflation are naturally
two-field models. In this paper, we use the delta N formalism to analyse how
the two-field behaviour modifies the usual single-field predictions. We find
that the model reduces to the single-field limit if the inflaton mass term is
sufficiently small. Otherwise, the imaginary inflaton component reduces the
amplitude A_s and the spectral index n_s of the scalar curvature perturbations.
However, the perturbations remain nearly Gaussian, and the reduced bispectrum
f_NL is too small to be observed.
