Speaker
Zhenmin Zeng
(Institute of Theoretical Physics, Chinese Academy of Sciences)
Description
We investigate the first-order phase transition catalyzed by primordial black holes~(PBHs) in the early Universe. We find that super-horizon curvature perturbations generated in this scenario lead to the production of gravitational waves when the scalar modes re-enter the horizon. If PBHs with masses about $10^{-13}M_{\odot}$ constitute all dark matter, the first-order electroweak phase transition catalyzed by PBHs can explain the gravitational wave signal observed by pulsar timing array collaborations without the overproduction of PBHs.
Primary authors
Zhenmin Zeng
(Institute of Theoretical Physics, Chinese Academy of Sciences)
Zongkuan Guo
(Institute of Theoretical Physics, Chinese Academy of Sciences)
