Generalized hydrodynamics and hydrodynamization in ultracold 1D gases

Experiments with nearly-integrable ultracold one-dimensional quantum
gases have probed integrability preserving dynamics involving large distances
and long times, testing the recently proposed theory of generalized
hydrodynamics [1]. Using "high-energy" quenches implemented via a Bragg
scattering pulse, the experiments have also unveiled fast local equilibration
at the shortest available time scales, a process known as hydrodynamization in
the context of relativistic heavy-ion collisions [2]. I will discuss the
experimental results and their theoretical understanding and modeling. For
hydrodynamization, I will argue that integrability provides a theoretical
framework from which one can draw a general picture that is expected to apply
to nonintegrable systems.