2025/06/19 by Yang, Cai-Xia, Han, Zhi-Long, Huang, Fei +2 · 1 citation
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #Dark Matter and Cosmic Phenomena #Dark matter #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Hot dark matter #Neutrino #Particle physics theoretical and experimental studies #Phenomenology (philosophy) #Seesaw mechanism #Seesaw molecular geometry #Sterile neutrino #Yukawa potential
paper · pdf · doi:10.48550/arxiv.2506.16100
openalex publication_date 2025/06/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Right-handed neutrinos N are introduced to explain the origin of the tiny neutrino masses via the seesaw mechanism. Required by relatively large Yukawa coupling and leptogenesis, masses of right-handed neutrinos are beyond 109 GeV. Such heavy right-handed neutrino can mediate the production of super heavy dark matter χ via the freeze-in mechanism. In the minimal Z2 symmetric model, the right-hand neutrino portal interaction is yN ϕχ N with the dark scalar ϕ. One drawback of the Z2 symmetric model is that the mass ordering mN>mϕ with long-lived ϕ is almost ruled out by Big Bang Nucleosynthesis. In this paper, we propose that by extending the dark symmetry to Z3, one additional interaction yχϕχc χ is further allowed. In this way, the new decay mode ϕ→ χχ would lead to the dark scalar ϕ being short-lived even with a feeble yχ, thus it is allowed by the cosmological constraints. The phenomenology of the Z3 symmetric super heavy dark matter model is also studied in this paper.