Regensburg 2025 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 16: Many-body Systems: Equilibration, Chaos, and Localization (joint session DY/TT)

DY 16.6: Talk

Tuesday, March 18, 2025, 15:15–15:30, H37

Thermal-relaxation asymmetry in fluctuating hydrodynamics — •Felipe Pereira-Alves and Aljaž Godec — Mathematical bioPhysics Group, Max Planck Institute for Multidisciplinary Sciences, 37077 Göttingen, Germany

It was theoretically predicted and recently experimentally confirmed that small systems, such as trapped colloidal particles quenched far from equilibrium, heat up faster than they cool down. The phenomenon was coined thermal-relaxation asymmetry. The proposed physical explanation of the asymmetry instigated intriguing questions about its existence in the thermodynamic limit. Here we investigate thermal relaxation dynamics in far-from-equilibrium temperature quenches on the level of fluctuating hydrodynamics of short- and long-range (logarithmically) interacting many-body systems. We prove the existence of a strict asymmetry for any temperature quench for both, short- and long-range interactions. Remarkably, in contrast to small systems, there is no ``close-to-equilibrium" regime of quenches for which heating and cooling are symmetric. Notably, we find that relaxation is self-similar up to the relaxation time, and uncover intricate differences between short- and long-range interactions.

Keywords: Non-equilibrium dynamics; Long-range interactions; Fluctuating hydrodynamics; Asymmetric relaxation