Testing Fundamental Ideas with $ν$'s

Abstract

Fundamental questions in neutrino physics are likely to be resolved by upcoming experiments. Neutrino masses require either new Higgs particles or sterile neutrinos. Their masses, couplings, and habitat are yet to be determined. Neutrino physics is particularly sensitive to brane ideas as the extra particles are electroweak singlets and may free-range in the bulk. We outline some of the important theoretical ideas for generating neutrino masses, and how experiments will affect their longevity.