Extremal Black Holes Stop Evaporating

Extremal Black Holes have the absolute minimum mass allowed for their charge or spin. At that limit, their Hawking temperature falls to absolute zero, so they theoretically emit no Hawking radiation. Without that radiation draining their mass, they could escape the evaporation that eventually destroys ordinary black holes and potentially persist forever. Scientists have never observed one, and physicists still debate whether nature can produce them.

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