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State-of-the-art hydrodynamic models of heavy-ion collisions haveconsiderable theoretical model uncertainties in the description of the veryearly pre-hydrodynamic stage. We add a new computational module,K$_\mathrm{T}$Iso, that describes the pre-hydrodynamic evolution kinetically,based on the relativistic Boltzmann equation with collisions treated in theIsotropization Time Approximation. As a novelty, K$_\mathrm{T}$Iso allows forthe inclusion and evolution of initial-state momentum anisotropies. To maintaincomputational efficiency K$_\mathrm{T}$Iso assumes strict longitudinal boostinvariance and allows collisions to isotropize only the transverse momenta. Weuse it to explore the sensitivity of hadronic observables measured inrelativistic heavy-ion collisions to initial-state momentum anisotropies andmicroscopic scattering during the pre-hydrodynamic stage.

Pre-hydrodynamic evolution and its impact on quark-gluon plasma signatures