Speaker
Philip Lu
Description
First order phase transitions can create a large mass gap between the false and true vacua for dark sector particles, effectively trapping them in false vacuum pockets. After an initial contraction phase, these particles coalesce into semi-stable compact objects, thermal balls and Fermi balls. Further cooling of these objects leads to a final collapse into primordial black holes. We show how this formation mechanism leads to two interesting possibilites: late-forming PBHs which could evade CMB bounds and regurgitated dark matter which form the PBHs from which they are re-emitted as Hawking radiation.
