Seminario DiFC-UNIPA: “Active Brownian Motion: Effects of Noise on Self-Propelled Particles” – 29Nov16

Group of Interdisciplinary Theoretical Physics
Dipartimento di Fisica e Chimica – Università degli Studi di Palermo

il Prof. Dr. Lutz Schimansky-Geier, 
Faculty of Mathematics and Natural Sciences, Department of Physics,
Statistical Physics and Nonlinear Dynamics & Stochastic Processes,
Humboldt-Universität zu Berlin
terrà un seminario su

Active Brownian Motion:
Effects of Noise on Self-Propelled Particles

Martedì 29 novembre 2016 alle ore 15.30

Tutti gli interessati, in particolare gli studenti, sono invitati a prender parte

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Dipartimento di Fisica e Chimica, Via Archirafi 36, Aula A

Sommario

I consider self-propelled particles under the influence of noise, a concept which was called “active Brownian motion”. First, I discuss the influence of active fluctuations or motor noise, as an independent stochastic sources in the direction of motion and velocity. Such description leads to an accumulation of probability at vanishing speed values. Secondly, effects of correlations in the noise and of Levy noise on the motion of the active particles are investigated. I present transport properties as the mean flux and the diffusion coefficient in different situations, e.g. overdamped, or with inertia, or with constant speed, and affected by additional torques etc. Furthermore, I consider interacting active Brownian agents. I focus on the problem how the onset of collective motion depends on the choice of the specific noise. Special attention is paid for the occurring large scaled spatial structures of chemo-tactically interacting Brownian agents. Finally, I propose a generic model which exhibits a turbulent behavior of the self-propelled particles. Macroscopic properties of these particles are in good agreement with experimental findings.

Ulteriori informazioni

e-mail: davide.valenti@unipa.it Davide Valenti tel.: +39 091 238 99037

Dipartimento di Fisica e Chimica – Università degli Studi di Palermo

avviso_schimansky-geier.pdf

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