Unification for the Darkly Charged Dark Matter

Understand

We provide a simple UV theory for a Dirac dark matter with a massless Abelian gauge boson.

• We introduce a single fermion transforming as the $\bf{16}$ representation in the SO(10)$'$ gauge group, which is assumed to be spontaneously broken to SU(5)$'\times$U(1)$'$.
• The SU(5)$'$ gauge interaction becomes strong at an intermediate scale and then we obtain a light composite Dirac fermion with U(1)$'$ gauge interaction at the low-energy scale.
• Its thermal relic can explain the observed amount of dark matter consistently with other cosmological and astrophysical constraints.