Seminarium "High Energy, Cosmology and Astro-particle Physics (HECA)"

I will discuss a detailed study of the confinement phase transition in a dark sector with a SU(N) gauge group and a single generation of dark heavy quark. We focus on heavy enough quarks such that their abundance freezes out before the phase transition and the phase transition is of first-order. We find that during this phase transition the quarks are trapped inside contracting pockets of the deconfined phase and are compressed enough to interact at a significant rate, giving rise to a second stage of annihilation that can dramatically change the resulting dark matter abundance. As a result, the dark matter can be heavier than the often-quoted unitarity bound of ~ 100 TeV. Finally I will show a concrete example where the link between the dark sector and the standard model is facilitated by a simple Z’ model.

https://us02web.zoom.us/j/85478248551