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DY: Fachverband Dynamik und Statistische Physik
DY 67: Poster: Active Matter, Microswimmers
DY 67.8: Poster
Thursday, March 15, 2018, 15:30–18:00, Poster A
Collective Motion of Topologically Interacting Particles in Heterogeneous Media — •Parisa Rahmani1,2, Fernando Peruani3, and Pawel Romanczuk2 — 1Department of Physics, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, Iran — 2Department of Biology, Institute for TheoreticalBiology, Humboldt Universität zu Berlin, Germany — 3Laboratoire J. A. Dieudonné, Université de Nice Sophia Antipolis, France
Collective motion of animals is a fascinating phenomenon occurring in bird flocks, fish schools, and other social animals. Modeling of collective motion is a tool for the understanding of the possible evolutionary benefits and costs associated to group living. An important aspect of collective motion is the impact of environmental heterogeneities. Chepizco et. al. [1] showed that in a model based on metric interaction network, there is an optimal noise which maximizes collective motion in the presence of obstacles. But, observations on animal groups revealed that the Voronoi interaction network outperforms the metric one [2]. Therefore, we study emergence and robustness of collective motion in a group of agents interacting with their topological neighbors in heterogenous media. We show that in this case there is no optimal noise. Topological interaction network is much more robust against obstacles, and even in high obstacle densities ordered phases are observed.
[1] O. Chepizhko et. al., Phys. Rev. Lett., 110 (2013), 238101(1-5)
[2] A. Strandburg-Peshkin et. al., Current Biology, 23 (2013), R709-R711