SIMP from a strong U(1) gauge theory with a monopole condensation
  We provide a variant model of strongly interacting massive particle (SIMP),
where composite dark matter comes from a strongly interacting U(1) theory. We
first explain a non-Abelian version of the model with an additional singlet
field, which is mixed with the Higgs field to maintain the kinetic equilibrium
between the hidden and Standard Model (SM) sectors. The mixing leads to signals
that would be detected by future collider experiments, direct DM detection
experiments, and beam-dump experiments. Then we investigate a U(1) theory with
a scalar monopole, where U(1) charged particles are confined by monopole
condensation. In this model, the radial component of monopole can mix with the
Higgs field, so that we do not need to introduce the additional singlet field.
