Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-11-15
Acta Phys.Polon. B32 (2001) 3707-3718; Lect.Notes Phys. 616 (2003) 39-49
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 pages, presented at the 5th Adriatic Meeting, Dubrovnik, and the XXV Int. School of Theoretical Physics, Ustron, September
Scientific paper
We discuss the implications of large neutrino mixings for grand unified theories based on the seesaw mechanism. In SU(5) GUTs large mixings can be accomodated by means of $U(1)_F$ flavour symmetries. In these models the heavy Majorana neutrinos are essentially decoupled from low energy neutrino physics. On the contrary in SO(10) GUTs large neutrino mixings severely constrain the mass spectrum of the heavy Majorana neutrinos. This leads to predictions for a variety of observables in neutrino physics as well as for the cosmological baryon asymmetry.
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