FRACTIONALLY CHARGED COLOR SINGLET FERMIONS AND LOW MASS MAGNETIC MONOPOLES IN SU(9) GRAND UNIFIED MODELS

Three SU(9) GUT models with fractionally charged color singlet fermions are proposed. One of them can also accommodate low mass magnetic monopoles. In these models there are three families of ordinary light fermions and exotic quarks and Jeptons with fractional or integral charges. From group st...