Unification without low-energy supersymmetry

Without supersymmetry, the gauge couplings in the standard model with five Higgs doublets unify around 10(14) GeV In this case, the trinified model, SU(3)(C) X SU(3)(L) X SU(3)(R) X Z(3), with the minimal Higgs sector required for symmetry breaking, is the ideal grand-unified candidate. Small neutrino masses are generated via a radiative seesaw mechanism, without the need for intermediate scales, additional Higgs fields, or higher-dimensional operators. The proton lifetime is above the experimental limits, with the decay modes p -> (v) over barK(+) and p -> mu K-+(0) potentially observable. The split-SUSY version of the model, with one light Higgs doublet, is equally attractive.