Neutrino Physics

Neutrino physics is presently focused on the problem of neutrino masses. If at least one neutrino is massive, this would mean for physics beyond the Standard Model. In addition, massive neutrinos could contribute significantly to dark matter. Direct measurements of neutrino masses are practically hopeless (perhaps with the exception of the electron-neutrino) and the most promising way to obtain evidence for non-zero masses is to search for neutrino oscillations. These lectures review the theory of neutrino oscillations, the existing experimental hints for their occurence and the present and future experiments on this subject.