Abstract
In the framework of the grand unified gauge group SU(4) 4 we discuss possibilities to reconcile the low unification scale (10 5−10 7 GeV) with the acceptable value of sin 2 θ w. We consider various specific models which differ by the values of the intermediate mass scale, the choice of the fermion multiplets and by the embedding of the electroweak group SU(2) into SU(4) 4. The class of theories with early unification and correct sin 2 θ w is constructed. They all predict new non-sequential fermions which are SU(2) L,R singlets and have unconventional electric charges. Cosmological implications of such theories are discussed and it is argued that new particles may well account for the positive results of searches for fractional charge in terrestrial matter.
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