Center for Theoretical Physics of the Universe (CTPU-PTC)

Primordial black hole formations in first-order phase transitions

by Tae Hyun Jung (KIAS)

zoom meeting

zoom meeting


Various new physics models can be tested via primordial black hole searches as well as the primordial black hole itself is a good dark matter candidate. In this talk, I will shortly introduce various primordial black hole formation mechanisms in cosmological first-order phase transitions and will focus on the mechanism where primordial black holes are formed by bubble collisions. For this mechanism to work, symmetry-breaking bubbles need to be super-horizon-sized and not run-away. The PBH abundance can be estimated by counting the number of such collisions of large bubbles for a given first-order phase transition. It will be shown that various PBH searches already rule out a part of the effective parameter space of first-order phase transitions, and another part can result in PBHs to be the whole dark matter.