After interesting presentation at academic days of emeritus professor of the University of Ljubljana (UL) Andrej Čadež about a notion and detecting of gravitational waves in 2016 an answer arose >what is minimal possible mass for (Schwarzchild) black hole<? Although professor didn't have time left, he just mentioned Hawking radiation, which is higher for BH with lower masses. I haven't done much analysis yet but I guess Planck mass might be a case.
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