Bonn - Small Lecture Hall Mathematics
A model for light sterile neutrinos
Some experimental anomalies suggest the possible existence of light sterile neutrino(s) mixing with the active ones. In this talk, we present a (supersymmetric) scenario in which the sterile neutrino is the fermionic partner of the pseudo-Goldstone boson associated with the spontaneous breaking of an approximate global symmetry. This property protects the sterile neutrino mass against large contributions that would otherwise be allowed by all symmetries. We discuss the phenomenological implications of such a light sterile neutrino.