Warm dark matter from freeze-in at stronger coupling
Abstract
We study warm Higgs portal dark matter (DM) in the framework of freeze-in at stronger coupling. This scenario assumes that the Standard Model thermal bath temperature has always been relatively low, which suppresses dark matter production. As a result, a significant DM-Higgs coupling is allowed, enabling warm dark matter detection via Higgs decay at colliders. We find that the Lyman- α bound on the DM mass is particularly strong, excluding masses below 50–100 keV, depending on further details. The shape of the DM momentum distribution is highly non-thermal, with low momenta being effectively cut off, and not captured by the common αβγ -parametrization.
Fields of Study & Subjects
Dark Matter and Cosmic Phenomena
Atomic and Subatomic Physics Research
Particle physics theoretical and experimental studies
Publication details
- Journal / source
- Physics Letters B
- Publisher
- Elsevier BV
- Volume
- 877
- Pages
- 140486–140486
- Publication date
- 30 April 2026
- Language
- EN