Di Liu ( (University of Plymouth)
Title
Dark Matter from SU (N) Containment
Abstract
SU(N) Yang-Mills theories are known to undergo a first-order phase transition. In this talk, I will show that the wall velocity is bounded by $v_w < 10^{-6}$, constrained by the time required for the substantial latent heat released during the transition to dissipate via Hubble expansion. In our dark matter model, quarks much heavier than the confinement scale can be introduced without affecting the confinement dynamics. After freeze-out, these heavy quarks are trapped in pockets of the deconfined phase until they annihilate with antiquarks. I will present the surviving dark baryon abundance, accounting for bound-state formation in both the bulk and—for the first time—at the boundary. I will demonstrate that dark baryons can serve as dark matter with masses up to $10^3$ TeV. Finally, I will discuss potential indirect and direct detection signals, as well as constraints from the cosmic microwave background and big bang nucleosynthesis, assuming interactions through Higgs and neutrino portals.