Dresden 2026 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 27: Statistical Physics far from Thermal Equilibrium II

DY 27.2: Vortrag

Dienstag, 10. März 2026, 14:15–14:30, ZEU/0114

Relaxation speed in quenched-random force fields — •Jan Meibohm and Sabine H.L. Klapp — Technische Universität Berlin, Institut für Physik und Astronomie, Fachgruppe Theoretische Physik, Hardenbergstraße 36, 10623 Berlin, Germany

We determine the asymptotic relaxation speed of a Brownian particle in quenched-random force fields with a harmonic background in dimensions d≥2. For random forces derived from a potential, we show that relaxation is generally slower than in the unperturbed case when the background is isotropic. By contrast, for strongly anisotropic backgrounds, where the background is stiffer in all directions except one, we find a crossover between slow and fast relaxation, similar to the one-dimensional case discussed in [1]. Allowing for non-potential forces changes this picture and leads to generally faster relaxation. In the limits of small and large correlation length of the random force, we identify universal regimes in which the relaxation speed becomes independent of of the details of the random forces. Finally, we analyse a scaling limit for quasi-isotropic backgrounds at weak disorder, where the change in relaxation speed becomes anomalously large.
[1] Meibohm & Klapp, Phys. Rev. Lett., 134.8, 087101 (2025)

Keywords: non-equilibrium relaxation; complex and disordered systems; Brownian motion; noise-induced phenomena