Speaker
Ville Vaskonen
(University of Padova)
Description
Cosmological first-order phase transitions may have played a significant role in the formation of baryon asymmetry and dark matter, potentially leaving an observable gravitational wave signature. In this talk, I will focus on the possibility of primordial black hole formation from slow and strongly supercooled transitions. I will describe how the stochastic nature of the bubble nucleation process generates large inhomogeneities that can collapse into primordial black holes after the transition. Additionally, I will show that for such transitions, the low-frequency part of the gravitational wave spectrum is sourced by the large fluctuations and the resulting spectrum has a distinguishable double-peak shape.
Author
Ville Vaskonen
(University of Padova)
