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DY: Fachverband Dynamik und Statistische Physik
DY 59: Brownian Motion and Anomalous Diffusion
DY 59.2: Vortrag
Freitag, 22. März 2024, 09:45–10:00, BH-N 334
Non-Gaussian displacements in active transport on a carpet of motile cells — •Robert Großmann1, Lara S. Bort1, Ted Moldenhawer1, Setareh Sharifi Panah1, Ralf Metzler1,2, and Carsten Beta1 — 1University of Potsdam, Potsdam, Germany — 2Asia Pacific Center for Theoretical Physics, Pohang, Republic of Korea
In this talk, we discuss the dynamics of micron-sized particles on a layer of motile cells [1]. This cell carpet acts as an active bath that propels passive tracer particles via direct mechanical contact. The resulting nonequilibrium transport shows a crossover from superdiffusive to normal-diffusive dynamics. The particle displacement distribution is distinctly non-Gaussian even in the limit of long measurement times—different from typically reported Fickian yet non-Gaussian transport, for which Gaussianity is restored beyond some system-specific correlation time. We obtain the distribution of diffusion coefficients from the experimental data and introduce a model for the displacement distribution that matches the experimentally observed non-Gaussian statistics. We argue why similar transport properties are expected for many composite active matter systems.
[1] Großmann, Bort, Moldenhawer et al. (2023) arXiv:2311.05377
Keywords: living and active matter; anomalous transport phenomena; stochastic models in biological physics; cell locomotion; interdisciplinary physics