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Monday, May 17, 2021
4:00 PM - 5:00 PM
Online Event

High Energy Physics Seminar

Thermal Squeezeout of Dark Matter
Pouya Asadi, MIT,

There exists overwhelming evidence pointing toward the existence of dark matter. Yet, its particle nature still remains a mystery. In light of this, it is important to map out all different dark sector models. A motivated class of such  models are confining dark sectors. In this talk, I present 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. I focus on heavy enough quarks such that their abundance freezes out before the phase transition and the phase transition is of first-order. I show 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.

Click here to join the seminar via Zoom.