Neutrinos: Windows to New Physics

Abstract

After briefly reviewing how the symmetries of the Standard Model (SM) are affected by neutrino masses and mixings, I discuss how these parameters may arise from GUTs and how patterns in the neutrino sector may reflect some underlying family symmetry. Leptogenesis provides a nice example of how different physical phenomena may be connected to the same neutrino window of physics beyond the SM. I end with some comments on the LSND signal and briefly discuss the idea that neutrinos have environment dependent masses.

10 pages, to appear in the Proceedings of the XXII International Conference on Neutrino Physics and Astrophysics, Neutrino 2006, Santa Fe, NM, June 2006