Ultralight, undying black holes could be all around the Universe

A new model presented by physicists raises the possibility that the Universe could be filled with ultralight primordial black holes that don’t die.

Formed during the earliest moments of the Universe, primordial black holes are hypothetical objects. 

The fate of ultralight black holes depends on whether or not evaporation stops at or around the Planck scale. If evaporation stops, the general expectation is that a population of Planck-scale will be left over, possibly including a significant fraction of electrically charged relics.