Apr 13, 2023

Primordial Black Holes May Have “Frozen” the Early Universe

Posted by in categories: cosmology, particle physics

Primordial holes formed in the exotic conditions of the big bang may have become their own source of matter and radiation.

The standard story of the early universe goes like this. When our cosmos was incredibly young, it underwent a period of incredibly rapid expansion known as inflation. Then inflation went away and flooded the universe with particles and radiation in the hot big bang. Then the universe expanded and cooled, and as it did so the density of that matter and radiation dropped. Eventually the matter got itself together informed stars, galaxies and clusters.

But new research suggests that this simple story may be missing a key ingredient: primordial black holes. Currently we know of only one guaranteed way to create black holes. That’s through the deaths of massive stars. When they collapse in on themselves at the end of their lives, they reach high enough densities to overwhelm every other force and trigger the formation of a black hole.

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