Title: High-Energy Cosmic Particle Mysteries

 

Abstract: New frontiers of particle astrophysics have just been opened by IceCube's discovery of cosmic high-energy neutrinos. Their origin is a new mystery in the field, and solving this problem allows us not only to understand the physics of astrophysical sources but also to obtain important clues about old mystery, the origin of cosmic rays, and to utilize neutrinos as probes of neutrino properties, dark matter, and fundamental physics. In this talk, I summarize the latest results of IceCube observations, and emphasize the relevance of multi-messenger approaches. I will review key theoretical ideas on the origin of high-energy cosmic neutrinos and some implications for particle physics properties.