Isotropization and Hydrodynamization in Weakly Coupled Heavy-Ion Collisions

We numerically solve the (2+1)-dimensional effective kinetic theory of weak coupling QCD under longitudinal expansion, relevant for early stages of heavy-ion collisions. We find agreement with viscous hydrodynamics and classical Yang-Mills simulations in the regimes where they are applicable. By choosing initial conditions that are motivated by a color-glass-condensate framework, we find that for Qₛ=2 GeV and αₛ=0.3 the system is approximately described by viscous hydrodynamics well before τ≲1.0 fm/c.