Flipped SU(5): Origins and Recent Developments
Abstract
Description
We present an account of the early developments that led to the present form of the flipped $SU(5)$ string model. We focus on the method used to decide on this particular string model, as well as the basic steps followed in constructing generic models in the free fermionic formulation of superstrings in general and flipped $SU(5)$ in particular. We then describe the basic calculable features of the model which are used to obtain its low-energy spectrum: doublet and triplet Higgs mass matrices, fermion Yukawa matrices, neutrino masses, and the top-quark mass. We also review the status of proton decay in the model, as well as the hidden sector bound states called cryptons. Finally, we comment on the subject of string threshold corrections and string unification.
25 pages. To appear in the Proceedings of the 15th Johns Hopkins Workshop on Current Problems in Particle Theory, Johns Hopkins University, August 26--28, 1991
25 pages. To appear in the Proceedings of the 15th Johns Hopkins Workshop on Current Problems in Particle Theory, Johns Hopkins University, August 26--28, 1991