Adding Z3 symmetry to the seesaw portal allows the dark scalar to decay promptly to dark matter, evading BBN limits for the m_N>m_phi mass ordering.
Minkowski, Phys
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Seesaw Portal to Super Heavy Dark Matter with $Z_3$ Symmetry
Adding Z3 symmetry to the seesaw portal allows the dark scalar to decay promptly to dark matter, evading BBN limits for the m_N>m_phi mass ordering.