Quantum insights on Primordial Black Holes as Dark Matter

Understand

A recent understanding on how quantum effects may affect black-hole evolution opens new scenarios for dark matter, in connection with the presence of black holes in the very early universe.

• Quantum fluctuations of the geometry allow for black holes to decay into white holes via a tunnelling.
• This process yields to an explosion and possibly to a long remnant phase, that cures the information paradox.
• Primordial black holes undergoing this evolution constitute a peculiar kind of decaying dark matter, whose lifetime depends on their mass $M$ and can be as short as $M^2$.