Discrepancies Between Limits and Measurements of Warm Dark Matter Properties

2025/04/26 by Hoeneisen, Bruce
#Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences

paper · doi:10.48550/arxiv.2504.21031

Abstract

A limit on the expansion parameter a_hNR at which dark matter becomes non-relativistic has been obtained from the observed minimum halo mass hosting Milky Way satellites. This limit is in disagreement with measurements. In the present study, we attempt to understand this disagreement. We find that the limit does not include the following phenomena: non-linear regeneration of the power spectrum of density perturbations, the stripping of galaxy halos by neighboring galaxies, and baryons that act as cold dark matter. Considering these phenomena, we find that there is no longer a significant discrepancy between the limit and the measurements.

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