Limiting attractors in heavy-ion collisions -- the interplay between bottom-up and hydrodynamic attractors

Abstract

In this contribution to the Quark Matter 2023 proceedings, we study the hydrodynamization process in heavy-ion collisions using QCD kinetic theory and introduce the new concept of limiting attractors. They are defined via an extrapolation of observables to vanishing and infinite couplings. We find that the pressure ratio exhibits both a hydrodynamic and a bottom-up limiting attractor, while the ratios of hard probes transport coefficients ${\hat{q}}^{zz}/{\hat{q}}^{yy}$ and ${\kappa }_T/{\kappa }_z$ are better described in terms of the new bottom-up limiting attractor.

Comments: 4 pages, 2 figures; Quark Matter 2023 Conference Proceeding