Berlin 2015 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 33: P5: Microswimmers, Active Liquids

CPP 33.8: Poster

Tuesday, March 17, 2015, 14:00–16:00, Poster C

Modeling active systems on different length scales: a comparison of pattern phenomenology — •Jonas Denk, Lorenz Huber, Emanuel Reithmann, and Erwin Frey — Ludwig-Maximilians-Universität, München, Deutschland

Modeling complex biological systems always includes a level of coarse-graining in order to reduce the intricate functions of each microscopic constituent and their interplay to a comprehensive description. For active systems of self-propelled particles realizations of this coarsening procedure range from agent-based simulations on a single particle level to mean field descriptions on a hydrodynamic length scale. Because these two approaches are conceptually different it is important to ask whether they yield similar results especially with respect to the formation of macroscopic patterns. Motivated by recent in vitro experiments of membrane-bound FtsZ, a bacterial cell-division protein, we compare microscopic particle-based simulations to a coarse-grained kinetic Boltzmann approach for systems of chirally driven polymers. We discuss conceptual differences and identify observables, that are suited for each level of description. We find that both approaches exhibit the same phenomenology in terms of vortex structure and flocking states. Furthermore, we argue discrepancies between them and discuss possible applications in the field of self-propelled particle systems.