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