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Is there, theoretically, a lower bound on the mass of a black hole? Or could you have a black hole that weights the same as an electron for example?

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    $\begingroup$ Did you check Wikipedia? $\endgroup$
    – Qmechanic
    Apr 14, 2022 at 8:45

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We don’t know.

Dimensional analysis suggests a black hole should finish its Hawking evaporation somewhere around the Planck mass. But without a theory of quantum gravity, we don’t know whether there is some prefactor like $\frac12$ or $\frac{2^{10}}{5^4}$ out front. It could also be that the gravitational constant $G$ is different at short distances, so that our prediction of the Planck mass is wrong.

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