Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-09-12
Physics
High Energy Physics
High Energy Physics - Phenomenology
17 pages, 2 figures, corrected typos and added references
Scientific paper
In grand unified theories with gauge groups larger than SU(5), the multiplets that contain the known quarks and leptons also contain fermions that are singlets under the Standard Model gauge group. Some of these could be the dark matter 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 dark matter. These ideas are illustrated in an SU(6) model.
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