Primordial Black Holes May Have 'Frozen' the Early Universe - by PaulMattSutter
. When inflation ended and the universe began to cool off, it was not a smooth and gentle process. Instead it was incredibly violent, with massive shifts in energy and mass from place to place. It’s possible that pockets of the universe may have spontaneously reached high enough densities to form black holes directly on their own, without having to go through the formation of stars first. These are the so-called primordial black holes.
If the primordial black holes were small enough, then they would evaporate completely while the universe was still in its infant stages, leaving no trace of their existence behind. But the researchers found that this leads to a curious situation. As these primordial black holes evaporated they released their own floods of radiation and matter.
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