Dresden 2011 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 22: Granular Matter/ Contact Dynamics
DY 22.3: Talk
Wednesday, March 16, 2011, 14:30–14:45, HÜL 186
Traffic jams, gliders, and bands in a simple lattice swarming model — •Fernando Peruani1, Tobias Klauss2, Andreas Deutsch2, and Anja Voss-Boehme2 — 1Max Planck Institute for the Physics of Complex Systems, Dresden, Germany — 2ZIH - Technische Universitaet Dresden, Dresden, Germany
In this talk, we will introduce a simple swarming model on a two-dimensional lattice where the self-propelled particles exhibit a tendency to align ferromagnetically. Volume exclusion effects are present: particles can only hop to a neighboring node if the node is empty. We will show that such effects lead to a surprisingly rich variety of self-organized spatial patterns. As particles exhibit an increasingly higher tendency to align to neighbors, they first self-segregate into disordered particle aggregates. Aggregates turn into traffic jams. Traffic jams evolve toward gliders, triangular high density regions that migrate in a well-defined direction. Maximum order is achieved by the formation of elongated high density regions - bands - that transverse the entire system. Numerical evidence suggests that below the percolation density the phase transition associated to orientational order is of first-order, while at full occupancy it is of second-order.