SO(10) Grand Unification
only one 16-dimensional spinor representation of SO(10) has the right quantum numbers to accommodate all fermions (including the right-handed neutrino) of one generation;
the gauge interactions of SO(10) conserve parity thus making parity a part of a continuous symmetry: this has the advantage that it avoids the cosmological domain wall problem associated with parity symmetry breakdown; and
it is the minimal left-right symmetric grand unified model that gauges the B — L symmetry and is the only other simple grand unification group that does not need mirror fermions . The model does not have any global symmetries.
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- H. Georgi, in Particles and Fields (edited by C. E. Carlson), A.I.P., 1975; H. Fritzsch and P. Minkowski, Ann. Phys. 93, 193 (1975).Google Scholar
- M. Gell-Mann, P. Ramond, and R. Slansky, in Supergravity (edited by D. Freedman et al. North-Holland, Amsterdam, 1980;Google Scholar
- See also T. Yanagida, K.E.K. preprint, 1979;Google Scholar