  We discuss the propagation of neutrino wave packets in a Lense-Thirring
space-time using a gravitational phase approach. We show that the neutrino
oscillation length is altered by gravitational corrections and that neutrinos
are subject to helicity flip induced by stellar rotation. For the case of a
rapidly rotating neutron star, we show that absolute neutrino masses can be
derived, in principle, from rotational contributions to the mass-induced energy
shift, without recourse to mass generation models presently discussed in the
literature.
