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In grand unified theories with gauge groups larger than SU(5), the multipletsthat contain the known quarks and leptons also contain fermions that aresinglets under the Standard Model gauge group. Some of these could be the darkmatter of the universe. Grand unified theories can also have accidental U(1)global symmetries (analogous to B-L in minimal SU(5)) that can stabilize darkmatter. These ideas are illustrated in an SU(6) model.

The Unification and Cogeneration of Dark Matter and Baryonic Matter