Are Primordial Black Holes a Natural Dark Matter Candidate?
This research investigates primordial black holes (PBHs) as a dark matter candidate in asteroid-mass ranges. By using three different mathematical measures, researchers found that fine-tuning is not an inherent problem for PBHs but depends on the specific structure of their abundance map. The findings define three naturalness classes and show that some PBH models are as natural as other dark matter candidates, resolving long-standing tensions in the field.