SEMINAR Friday, June 6th - h. 15:00 Auditorium B. Touschek      A. Studenikin (Moscow State U.)  Massive neutrino: new effects in oscillations and new mechanism for electromagnetic radiation in matter     Abstract   A review on electromagnetic properties of massive neutrino in matter and electromagnetic fields is presented. A new Lorentz-invariant approach to description of neutrino spin and flavour oscillations in matter and electromagnetic fields is discussed. Within this approach it becomes possible to study neutrino oscillations in moving matter (including the case of  matter moving with relativistic speed) and arbitrary electromagnetic fields. We show that the matter motion and polarization can drastically change the neutrino oscillation pattern. A new mechanism of electromagnetic radiation by massive neutrino ("spin light of neutrino") propagating in the background matter and electromagnetic fields is proposed.