Models for SIMP dark matter and dark photon
  We give a review on the SIMP paradigm and discuss a consistent model for SIMP
dark mesons in the context of a dark QCD with flavor symmetry. The $Z'$-portal
interaction is introduced being compatible with stable dark mesons and is
responsible for making the SIMP dark mesons remain in kinetic equilibrium with
the SM during the freeze-out process. The SIMP parameter space of the $Z'$
gauge boson can be probed by future collider and direct detection experiments.
