Seesaw Mechanism and Its Implications

Abstract

The seesaw mechanism for neutrino masses is introduced and some of its different realizations and applications are discussed. It is pointed out how they can be used to understand the bi-large mixing patterns among neutrinos in combination with assumptions about high scale physics such as grand unification or quasi-degeneracy of neutrino masses.Comment: 14 pages; 2 figures; Invited talk presented at the SEESAW25 conference in Paris, June, 2004; a slightly shorter version will appear in the proceedings of SEESAW 25. This version contains a more references to original paper