Abstract
An attempt is made to fill in the particle-mass gap between the ordinary masses of a few hundred GeV and the grand unification mass of 10/sup 15/ GeV by incorporating two and three stages of spontaneous symmetry breaking in the various descents of SO(10) to the low-energy symmetry SU(2)/sub L/ x U(1) x SU(3)/sub c/. It is shown that intermediate masses of order 10/sup 10/ GeV can exist in the particle-mass gap. Values lower than 10/sup 10/ GeV can only be achieved at the expense of pushing the grand unifying mass to the Planck mass. Also similarities in the gauge structure and differences in the Higgs-scalar and fermion representations of the SU(2)/sub L/ x SU(2)/sub R/ x SU(4)/sub c/-based Pati-Salam model and its synthesis into SO(10) are pointed out.
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