It isn’t totally discredited, but the constraints on it make it exceedingly unlikely. Against it: No gamma ray signals as hoped/expected from evaporating PBH’s

It isn’t totally discredited, but the constraints on it make it exceedingly unlikely. Against it: No gamma ray signals as hoped/expected from evaporating PBH’s. LIGO is not seeing PBH mergers at a rate that would support the numbers required. Micro lensing studies don’t support it. Is it’s possible, but it’s much less likely than other theories which allow for less fine tuning of parameters. There’s a very good graphic that shows what I’m talking about. https://astrobites.org/wp-content/uploads/2017/08/constraintsPBH.png https://astrobites.org/wp-content/uploads/2017/08/constraint... From: https://astrobites.org/2017/08/31/could-dark-matter-be-black-holes/ https://astrobites.org/2017/08/31/could-dark-matter-be-black...