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.
If evaporation does not stop, a runaway “explosion” would occur, with significant and potentially detectable high-energy emissions.
Researcher Stefano Profumo reviewed both possibilities, with an emphasis on current status and future detection prospects.
According to the models, they formed from micro-fluctuations in matter density and spacetime to become sand grain-sized mountain-massed black holes.
Although scientists have never detected primordial black holes, they have all the necessary properties of dark matter, such as not emitting light and the ability to cluster around galaxies. If they exist, they could explain most of dark matter, according to the paper in Universe Today.
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