Minimal semi-annihilating ℤ_Nscalar dark matter

Abstract

We study the dark matter from an inert doublet and a complex scalar singlet\nstabilized by $\\mathbb{Z}_N$ symmetries. This field content is the minimal one\nthat allows dimensionless semi-annihilation couplings for $N > 2$. We consider\nexplicitly the $\\mathbb{Z}_3$ and $\\mathbb{Z}_4$ cases and take into account\nconstraints from perturbativity, unitarity, vacuum stability, necessity for the\nelectroweak $\\mathbb{Z}_N$ preserving vacuum to be the global minimum,\nelectroweak precision tests, upper limits from direct detection and properties\nof the Higgs boson. Co-annihilation and semi-annihilation of dark sector\nparticles as well as dark matter conversion significantly modify the cosmic\nabundance and direct detection phenomenology.\n