Neutrino Oscillations form Cosmic Sources: a Nu Window to Cosmology
  In this essay we extend the standard discussion of neutrino oscillations to astrophysical neutrinos propagating through expanding space. This extension introduces a new cosmological parameter $I$ into the oscillation phase. The new parameter records cosmic history in much the same manner as the redshift z or the apparent luminosity D_L. Measuring $I$ through neutrino oscillations could help determine cosmological parameters and discriminate among different cosmologies. 
D.J. Wagner and T.J. Weiler
astro-ph.CO gr-qc hep-ph