Abstract
We present a grand unified model based on the supersymmetric SU(3) L ⊗ SU(3) CL ⊗ SU(3) CR ⊗ SU(3) R gauge group, which unifies in one single step the three gauge couplings of the standard model at an scale M∼10 18 GeV, and spontaneously breaks down to SU(3) c ⊗ U(1) EM using only fundamental representations of SU(3). In this model the proton decay is highly suppressed and the doublet-triplet problem is lessened. The see-saw mechanism for the neutrinos is readily implemented with the use of an extra tiny mass sterile neutral particle for each generation which provides a natural explanation to the neutrino puzzle.
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