Regensburg 2004 – wissenschaftliches Programm
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DY: Dynamik und Statistische Physik
DY 22: Fractals and Nonlinearity II
DY 22.1: Vortrag
Dienstag, 9. März 2004, 11:30–11:45, H2
Noise Induced Transition from Translational to Rotational Motion of Swarms — •Udo Erdmann1, Werner Ebeling1, and Alexander S. Mikhailov2 — 1Institut für Physik, Humboldt-Universität zu Berlin, Newtonstraße 15, 12489 Berlin — 2Department of Physical Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin
We report a new type of noise-induced transition represented by the exchange of stability between the translational and rotational modes of a system of Active Brownian particles. Active Brownian particles are a promising model to resemble the basic features of biological active motion of swarms. First we discuss the basic model of interacting Active Brownian particles in two dimensions and introduce the Rayleigh model of active friction. New solutions for the translational modes are presented in the deterministic and in the stochastic descriptions. The border of stability of the translational mode is investigated. A noise induced transition to the rotational mode is observed and investigated. Finally the theory is compared with simulations.