Abstract
In this paper, we study the feeble sterile neutrino portal dark matter under the Z3 symmetry. The dark sector consists of one fermion singlet χ and one scalar singlet χ, which transform as χ→ei2π/3χ,ϕ→ei2π/3ϕ under the Z3 symmetry. Regarding fermion singlet χ as the dark matter candidate, the new interaction terms yχϕχc¯χ and μϕ3/2 could induce various new production channels. For instance, when mϕ>2mχ, the pair decay ϕ→χχ could be the dominant channel, rather than the delayed decay ϕ→χν. Another appealing scenario is when the dark sector is initially produced through the scattering process as NN→χχ,NN→ϕϕ,hν→χϕ, then the semiproduction processes Nχ→ϕϕ,Nϕ→ϕχ,Nχ→χχ could lead to the exponential growth of dark sector abundances. The phenomenology of the sterile neutrino and the cosmological impact of the dark scalar are also considered in the Z3 symmetric model. Published by the American Physical Society 2024
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