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A simple model of dark matter contains a light Dirac field charged under ahidden U(1) gauge symmetry. When a chiral matter content in a strong dynamicssatisfies the t'Hooft anomaly matching condition, a massless baryon is anatural candidate of the light Dirac field. One realization is the same mattercontent as the standard SU(5)$\times$U(1)$_{(B-L)}$ grand unified theory. Wepropose a chiral [SU(5)$\times$U(1)]$^4$ gauge theory as a unified model of theSM and DM sectors. The low-energy dynamics, which was recently studied, isgoverned by the hidden U(1)$_4$ gauge interaction and the third-familyU(1)$_{(B-L)_3}$ gauge interaction. This model can realize self-interactingdark matter and alleviate the small-scale crisis of collisionless cold darkmatter in the cosmological structure formation. The model can also address thesemi-leptonic $B$-decay anomaly reported by the LHCb experiment.

Unification of the Standard Model and Dark Matter Sectors in [SU(5)$\times$U(1)]$^4$