Speaker
Dr
Tae Hyun Jung
(Korea Institute For Advanced Study)
Description
In this talk, I will show that primordial black holes can be formed by bubble collisions if colliding bubbles are 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. As a quick example, we use an effective parameters of first-order phase transitions and show that various PBH searches already rule out a part of the reasonable parameter space. In addition, some other choice of parameters can result in PBHs to be the whole dark matter.
