$[SU(2){]}^3$ Dark Matter

An extra $SU(2{)}_D$ gauge factor is added to the well-known left-right extension of the standard model (SM) of quarks and leptons. Under $SU(2)_L \times SU(2)_R \times SU(2)_D$,twofermionbidoublets$(2,1,2)$and$(1,2,2)$areassumed\mathrm{.}Theresultingmodelhasanautomaticdark$U(1)$ symmetry, in the same way that the SM has automatic baryon and lepton $U(1)$ symmetries. Phenomenological implications are discussed, as well as the possible origin of this proposal.