This is going back many years, but I seem to recall that one of the arguments against primordial black holes is that - assuming Hawking radiation is correct - w

This is going back many years, but I seem to recall that one of the arguments against primordial black holes is that - assuming Hawking radiation is correct - we should see evidence of black holes evaporating if they are of the correct size, but that hasn't been seen. https://www.nature.com/articles/248030a0 https://www.nature.com/articles/248030a0