Theory and Experiment in High Energy Physics

Black holes and gravitational waves from slow phase transitions

29 Oct 2024, 14:00

20m

„Aula B” Lecture Room (Heavy Ion Laboratory, University of Warsaw)

Speaker

Piotr Toczek (University of Warsaw)

Description

Slow first-order phase transitions generate large inhomogeneities that can lead to the formation of primordial black holes (PBHs). We show that the gravitational wave (GW) spectrum then consists of a primary component sourced by bubble collisions and a secondary one induced by large perturbations. The latter gives the dominant peak if $\beta /H_0<10$, impacting, in particular, the interpretation of the recent PTA data. The GW signal associated with a particular PBH population is stronger than in typical scenarios because of a negative non-Gaussianity of the perturbations and it has a distinguishable shape with two peaks.

Presentation materials

D1_3.1_Piotr Toczek.mp4

Visegrad_workshop_PT.pdf