Dark Matter May Be Made of Black Holes From Another Universe

A new cosmological model suggests dark matter could be made of primordial black holes that survived from a previous universe cycle.

The idea, proposed by Enrique Gaztanaga and published in Physical Review D, frames the universe as cyclic with a cosmic bounce.

If supported by observations, it could offer a testable alternative to particle dark matter and a new origin story for black holes and cosmic structure.

Researchers now need to compare the model against data from galaxy surveys, the cosmic microwave background, and gravitational waves.