Journal
PHYSICAL REVIEW D
Volume 85, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.85.013001
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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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