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Vitor Cardoso considers it unlikely that dark matter consists of primordial black holes. Microlensing studies have ruled out most heavy mass ranges, while lighter black holes would have already evaporated via Hawking radiation, leaving only a tiny sliver of parameter space.
Rotating black holes can shed rotational energy to low-frequency fields through superradiance. Vitor Cardoso explains that if dark matter consists of massive axions, these particles would become trapped in orbit, forming dense quantum clouds that mimic a cosmic hydrogen atom.
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