Quasinormal modes of nonthermal fixed points

At the early stages of ultra-relativistic nuclear collisions, the system is expected to reach a Nonthermal Fixed Point. This makes them an important phenomenon to study for understanding thermalization in QCD matter. In this work we propose, analogously to how quasinormal modes play a prominent role in the relaxation of diverse physical systems to equilibria, ranging from astrophysical black holes to tiny droplets of quark-gluon plasma at the RHIC and LHC accelerators, that a novel kind of quasinormal mode governs the direct approach to self-similar time evolution of nonthermal fixed points. We compute the spectrum of these far-from-equilibrium quasinormal modes for a kinetic theory with a Fokker-Planck collision kernel in isotropic and homogeneous states. Our conclusion is that quasinormal modes of nonthermal fixed points give rise to a tower of progressively more decaying power-law contributions. This proceeding is based on the Flash Talk at Quark Matter 2025.