  High energy accelerators may probe into dark matter and the seesaw neutrino
mass scales if they are not much heavier than ~O(TeV). In the absence of
supersymmetry, we extend a class of SO(10) models to predict well known cold
dark matter candidates while achieving precision unification with
experimentally testable proton lifetime. The most important prediction is a new
radiative seesaw formula of Ma type accessible to accelerator tests while the
essential small value of its quartic coupling also emerges naturally. This
dominates over the high-scale seesaw contributions making a major impact on
neutrino physics and dark matter, opening up high prospects as a theory of
fermion masses.
