Unraveling hydrodynamization with Bragg-scattering pulses in 1D Bose gases

The term “hydrodynamization” was introduced to describe the notably short period of time after the start of a relativistic heavy ion collision before hydrodynamics can be used to describe the time evolution of the system. This fastest time scale and the following local prethermalization was recently observed in a system of 1D bose gases after a Bragg-scattering pulse quench [1]. In this work, we explore the conditions for hydrodynamization with different types of pulse sequences experimentally and theoretically (in the Tonks-Girardeau limit). We show that a quantum Newton’s cradle setup can undo the features of hydrodynamization that was previously observed. We further construct a nonequilibrium initial state that captures the main characteristics of the Bragg scattering pulse quenches. With this setup, we systemically study the dependence on the center and spread of the post-quench state energies for the hydrodynamization and local prethermalization time scales.



[1] Le, et al. Observation of hydrodynamization and local prethermalization in 1D Bose gases. Nature 618, 494–499 (2023).