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DY: Fachverband Dynamik und Statistische Physik

DY 9: Statistical Physics of Biological Systems II (with BP, talks from BP)

DY 9.6: Vortrag

Montag, 26. März 2012, 16:15–16:30, H 1058

Fractional Brownian Motion in Crowded Fluids — Dominique Ernst¹, Marcel Hellmann², Jürgen Köhler¹, and •Matthias Weiss² — ¹Experimental Physics IV, University of Bayreuth, D-95440 Bayreuth — ²Experimental Physics I, University of Bayreuth, D-95440 Bayreuth

Diffusion in crowded fluids, e.g. in the cytoplasm of living cells, has frequently been reported to show an anomalous characteristics ('subdiffusion'). Several random walk models have been proposed to explain these observations, yet so far an experimentally supported decision in favor of one of these models has been lacking. Here, we show that experimentally obtained trajectories in a prototypical crowded fluid show an ergodic behavior and an asphericity that is most consistent with the predictions of fractional Brownian motion, i.e. an anti-correlated, anti-persistent generalization of normal Brownian motion that is related to the fluid's viscoelasticity.