Dresden 2017 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 53: Pattern Formation (Joint Session DY/BP)
BP 53.5: Vortrag
Donnerstag, 23. März 2017, 16:00–16:15, ZEU 118
Modeling collective motion and pattern formation of self-propelled rods and application to myxobacteria — Robert Großmann1,2, Fernando Peruani1, and •Markus Bär2 — 1Universite de Nice, France — 2Physikalisch-Technische Bundesanstalt, Germany
We study self-propelled particles with nematic velocity-alignment in two dimensions, which reverse their direction of motion repeatedly. The large-scale properties of these point-like self-propelled rods are analyzed within a hydrodynamic theory that can be systematically derived from the microscopic dynamics. Combining analytical methods and numerical continuation, we show that an entire family of elongated high-density regions, called bands, self-segregates spontaneously from a homogeneous background via two subcritical bifurcations. The reduction of the multi-particle system onto the dynamics of bands provides a unified framework to understand aggregation mechanisms and nonequilibrium phase separation in active systems with nematic velocity-alignment, e. g. the collective dynamics of rod-shaped, actively moving myxobacteria. R. Großmann, F. Peruani, and M. Bär, Phys. Rev. E 94, 050602 (2016).