We propose a new out-of-equilibrium production mechanism of light dark matter: resonance scanning. If the dark matter mass evolved in the early Universe, resonant production may have occurred for a wide range of light dark matter masses today. We show that the dark matter relic abundance may be produced through the Higgs portal, in a manner consistent with current experimental constraints.
@article{arxiv.2012.15284,
title = {Light Dark Matter through Resonance Scanning},
author = {Djuna Croon and Gilly Elor and Rachel Houtz and Hitoshi Murayama and Graham White},
journal= {arXiv preprint arXiv:2012.15284},
year = {2021}
}