Abstract
We consider a complex scalar field as SIMP dark matter in models with gauged Z 3 discrete symmetry appearing as a remnant of dark local U(1). Dark matter (DM) annihilates dominantly by the 3-to-2 scattering, due to the DM cubic coupling in combination with the DM quartic coupling or the Z′ gauge and dark Higgs couplings. We show that a light Z′ gauge boson makes DM in kinetic equilibrium with thermal plasma at freeze-out and it affects the DM relic density and perturbativity/unitarity constraints for DM self-interactions. We show that the large DM self-interactions are consistent with solving small-scale structure problems and explaining the DM halo separation recently observed in Abell 3827 cluster. Various bounds on the model from the SIMP conditions, DM self-interactions, Z′ searches, DM direct/indirect detection experiments, and Higgs signals, are also discussed.
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Choi, SM., Lee, H.M. SIMP dark matter with gauged Z 3 symmetry. J. High Energ. Phys. 2015, 63 (2015). https://doi.org/10.1007/JHEP09(2015)063
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DOI: https://doi.org/10.1007/JHEP09(2015)063