  One-loop theta-exact quantum corrections to the neutrino propagator are
computed in noncommutative U*(1) gauge-theory based on Seiberg-Witten maps. Our
closed form results show that the one-loop correction contains a hard 1/epsilon
UV divergence, as well as a logarithmic IR-divergent term of the type ln
sqrt(theta p)^2, thus considerably softening the usual UV/IR mixing phenomenon.
We show that both of these problematic terms vanish for a certain choice of the
noncommutative parameter theta which preserves unitarity. We find
non-perturbative modifications of the neutrino dispersion relations which are
assymptotically independent of the scale of noncommutativity in both the low
and high energy limits and may allow superluminal propagation. Finally, we
demonstrate how the prodigious freedom in Seiberg-Witten maps may be used to
affect neutrino propagation in a profound way.
