3 ms·

Wouldn't low-mass primordial black holes have evaporated by now?

• jfengel 3mo ago
  Depends on what "low mass" means. An earth-mass black hole lasts 10^50 years. A black hole the mass of Mount Everest lasts 10^21 years. Black holes on the order of metric tons would have evaporated by now. But primordial black holes can come in any size, and there is a vast range of them that will exist much longer than the universe has already existed.