All Dark Matter in the Universe Could Be Primordial Black Holes – Formed From the Collapse of Baby Universes Soon After the Big Bang

"The first HSC observations have already reported a very intriguing candidate event consistent with a PBH [primordial black hole] from the “multiverse,” with a black hole mass comparable to the mass of the Moon. Encouraged by this first sign, and guided by the new theoretical understanding, the team is conducting a new round of observations to extend the search and to provide a definitive test of whether PBHs from the multiverse scenario can account for all dark matter."

https://scitechdaily.com/all-dark-matter-in-the-universe-could-be-primordial-black-holes-formed-from-the-collapse-of-baby-universes-soon-after-the-big-bang/