Berlin 2018 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 67: Poster: Active Matter, Microswimmers

DY 67.13: Poster

Thursday, March 15, 2018, 15:30–18:00, Poster A

Multicomponent Systems of Self-Propelled Particles — •Thomas Bissinger and Matthias Fuchs — Universität Konstanz, Fachbereich Physik, 78457 Konstanz

Self-propelled particles (SPPs) have been studied intensely for more than two decades now, with interests ranging from physics to biology and social sciences.

Our work is on the Vicsek model (VM) in 2D, for which we use a generalization to mixtures of particle species. We investigate motility induced phase separation (MIPS) for a binary mixture of SPPs. MIPS occurs when the absolute particle velocity decreases with increasing density, leading to slowly moving clusters with fast particles crossing between clusters.

Besides particle-based numerical simulations, we treated the system theoretically with a generalization of Ihle’s phase space approach [1], which utilizes a Chapman-Enskog expansion to arrive at hydrodynamic equations for the binary VM. An alternate approach followed is based on a description by correlation functions.

[1] Ihle, Thomas. "Kinetic theory of flocking: Derivation of hydrodynamic equations." Physical Review E 83.3 (2011): 030901.