Neutrino properties from high energy astrophysical neutrinos
  It is shown how high energy neutrino beams from very distant sources can be utilised to learn about some properties of neutrinos such as lifetimes, mass hierarchy etc. Furthemore, even mixing elements such as U_e3 and the CPV phase in the neutrino mixing matrix can be measured in principle. Pseudo-Dirac mass differences as small as 10^-18 eV^2 can be probed as well. 
Sandip Pakvasa