Physicist Proposes Dark Matter Is Made of Black Holes That Survived Dead Universes

A new study suggests dark matter may be made of primordial black holes left over from a previous universe.

In a Big Bounce cosmology, some black holes could survive a cosmic collapse and reappear in the current universe.

The idea offers a testable alternative to particle dark matter and may also help explain early supermassive black holes.

Future galaxy surveys, gravitational-wave data, and cosmic microwave background measurements could help check the hypothesis.