Berlin 2012 – scientific programme
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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: Talk
Monday, March 26, 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.