Neutrino Properties from High Energy Astrophysical Neutrinos
  It is shown that high energy neutrino beams from very distant sources can beutilized to learn about some properties fof neutrinos such as lifetimes and mass hierarchy etc. Furthermore, even mixing elements such as U-e3 and the CPV phase can be measured in principle. Pseudo-Dirac mass differences as small as 10^-18 eV^2 can be probed as well. 
Sandip Pakvasa