Leptogenesis from dark matter coannihilation
Abstract
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.
Fields of Study & Subjects
Dark Matter and Cosmic Phenomena
Cosmology and Gravitation Theories
Particle physics theoretical and experimental studies
Publication details
- Journal / source
- Journal of Cosmology and Astroparticle Physics
- Publisher
- IOP Publishing
- Volume
- 2026
- Issue
- 02
- Pages
- 078–078
- Publication date
- 1 February 2026
- Language
- EN