The Many Guises of a Neutral Fermion Singlet

Abstract

The addition of a neutral fermion singlet to the standard model of particle interactions leads to many diverse possibilities. It is not necessarily a right-handed neutrino. I discuss many of the simplest and most interesting scenarios of possible new physics with this approach. In particular I propose the possible spontaneous breaking of baryon number, resulting in the massless 'sakharon'.

Comments: 13 pages, 2 figures, submitted as a Brief Review to MPLA