Speaker
Description
Understanding thermalization in quantum field theory stems largely from understanding properties of non-hydrodynamic excitations. These nonhydrodynamic excitations are known to differ structurally between weakly and strongly coupled theories. In this talk, I demonstrate that a large class of non-hydrodynamic excitations can be understood as a consequence of different realizations of a symmetry principle. As a main example, I show how to apply emergent shift symmetry to construct a far-from-equilibrium generalization of the hydrodynamic effective action. This shift-symmetry-based approach naturally includes the effects of excitations and stochastic fluctuations outside the hydrodynamic regime. Furthermore, I will present the application of non-Abelian algebra in describing spin in the context of quark-gluon plasma.