AI Summary

Primordial black holes, hypothetical objects that could have formed from dense clumps of matter in the early universe, differ from the stellar‑origin black holes seen today. Some theories proposed that “stupendously large” primordial black holes might explain a significant portion of the universe’s dark matter. New calculations by Nicholas Leister of the Mainz Institute for Theoretical Physics and colleagues show that even if such massive primordial black holes exist, they cannot account for any meaningful fraction of dark matter.

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