Year: 2026
Type: article
Abstract: We propose a minimal extension of the type-I seesaw model to realise leptogenesis from the coannihilation of dark sector particles. The type-I seesaw model is extended with a singlet fermion and two singlet scalars charged under a Z 2 symmetry. The Z 2 -odd singlet scalar is the dark matter candidate. Here the usual type-I seesaw mechanism generates neutrino mass, and a net lepton asymmetry is generated from the coannihilation of the dark matter and the Z 2 -odd singlet fermion. The Z 2 -even singlet scalar is important in dark matter phenomenology. Successful leptogenesis is possible at TeV-scale, unlike the vanilla case. This minimal extension provides an elegant explanation of successful leptogenesis with direct connection to the dark matter abundance in the Universe.
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Award: G2214728054
OpenAlex ID: W4415315175