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Artist view of small black holes in the accretion disk of a supermassive black hole. Credit: Caltech/R. Hurt
There are lots of primordial black hole models, but they all propose that they formed in the earliest moments of the universe. Depending on the particular model, they could range in size from tiny, mountain-mass ones to sub-stellar black holes more massive than a super-Earth. If they are particularly massive, they could have been the seeds of the galactic black holes we see today. If they are particularly tiny, they might be the source of dark matter.
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