Cold light dark matter in extended seesaw models
High Energy Physics - Phenomenology
2018-04-10 v2 Cosmology and Nongalactic Astrophysics
Abstract
We present a thorough discussion of light dark matter produced via freeze-in in two-body decays A -> B DM. If A and B are quasi-degenerate, the dark matter particle has a cold spectrum even for keV masses. We show this explicitly by calculating the transfer function that encodes the impact on structure formation. As examples for this setup we study extended seesaw mechanisms with a spontaneously broken global U(1) symmetry, such as the inverse seesaw. The keV-scale pseudo-Goldstone dark matter particle is then naturally produced cold by the decays of the quasi-degenerate right-handed neutrinos.
Cite
@article{arxiv.1709.07283,
title = {Cold light dark matter in extended seesaw models},
author = {Sami Boulebnane and Julian Heeck and Anne Nguyen and Daniele Teresi},
journal= {arXiv preprint arXiv:1709.07283},
year = {2018}
}
Comments
16 pages plus appendices, 4 figures; corrected discussion of sub-keV dark matter; matches JCAP version