Dresden 2017 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 23: Microswimmers II (joint session DY/BP)

DY 23.4: Vortrag

Dienstag, 21. März 2017, 15:15–15:30, HÜL 186

Extreme fluctuations of active Brownian motion — •Patrick Pietzonka, Kevin Kleinbeck, and Udo Seifert — II. Institut für theoretische Physik, Universität Stuttgart

In active Brownian motion, an internal propulsion mechanism interacts with translational and rotational thermal noise and other internal fluctuations to produce directed motion. We derive the distribution of its extreme fluctuations and identify its universal properties using large deviation theory [1]. The limits of slow and fast internal dynamics give rise to a kink-like and parabolic behavior of the corresponding rate functions, respectively. For dipolar Janus particles in two- and three-dimensions interacting with a field, we predict a novel symmetry akin to, but different from, the one related to entropy production. Measurements of these extreme fluctuations could thus be used to infer properties of the underlying, often hidden, network of states.

[1] P. Pietzonka, K. Kleinbeck, U. Seifert, New. J. Phys. 18, 052001 (2016)