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DY: Fachverband Dynamik und Statistische Physik

DY 29: Posters II

DY 29.17: Poster

Donnerstag, 29. März 2012, 17:00–19:00, Poster A

Mean-field theory of Active Brownian particles with velocity-alignment — •Robert Großmann¹, Pawel Romanczuk^1,2, and Lutz Schimansky-Geier¹ — ¹Department of Physics, Humboldt-Universität zu Berlin, Newtonstraße 15, 12439 Berlin, Germany — ²Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Straße 38, 01187 Dresden, Germany

A model of active Brownian particles with velocity-alignment in two spatial dimensions is introduced. The individual dynamics is based on the so called Schienbein-Gruler model as well as thermal and active fluctuations. A macroscopic description is derived directly from the microscopic Langevin dynamics via a nonlinear Fokker-Planck equation and a moment expansion of the corresponding probability density function. We discuss the impact of different fluctuation types on the onset of collective motion, i.e. noise induced bistabilities.