| Description: | Dark matter represents 84% of the gravitating-mass density of the Universe. Observational searches for its component particles or objects are faced with an array of possibilities that span masses between 10^-55 and 10^+35 grams. Experiments have largely focused on predictions for ~10^-23-gram WIMP candidates, where the particle mass and density naturally correspond to the hypothesis of weakly-interacting particles that decoupled from cosmic expansion. However, the dramatic improvement in WIMP constraints has led to a re-examination of a variety of models, from fuzzy cold-dark matter where the particles form few-kpc Bose-Einstein condensates and suppress smaller-scale structure formation, to 30-100 solar mass primordial black holes. I will demonstrate that radio observations have a uniquely important role in searches for dark matter across all mass scales. Additionally, I will describe some interesting radio constraints that are being set on dark-matter candidates. |
