The IceCube detector in the deep ice at the south pole has seen two instances of 1015 eV neutrinos. These are said to be the highest energy neutrinos so far seen. http://resonaances.blogspot.com/2013/09/storm-in-ice-cube.html What process could have launched such high energy neutrinos? It has been proposed for consideration that the particles result from spontaneous decay of dark matter particles. For comparison, the LHC is designed to collide particles going at energy of 7 TeV. These neutrinos are going at 1000 TeV. We seem not to know much about physics at energies in the 1000 TeV range. I'm curious about this and would be glad if anyone has an enlightening comment to make about it.