Dresden 2009 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 4: Statistical physics in biological systems II (joint session DY/BP)

DY 4.7: Talk

Monday, March 23, 2009, 16:00–16:15, HÜL 386

Collective motion due to individual escape and pursuit response — •Pawel Romanczuk¹, Iain D. Couzin², and Lutz Schimansky-Geier¹ — ¹Institut für Physik, Humboldt Universität Berlin, Germany — ²Department of Ecology and Evolutionary Biology, Princeton University, USA

Recent studies suggest that non-cooperative behavior such as cannibalism may be a driving mechanism of collective motion. Motivated by these novel results we introduce a simple model of Brownian particles interacting by biologically motivated pursuit and escape interactions. We show the onset of collective motion for both interaction types and analyze their impact on the global dynamics. We demonstrate a strong dependence of experimentally accessible macroscopic observables on the relative strength of escape and pursuit, determine the scaling of the migration speed with model parameters and present a mean field description.