Fore-aft asymmetric flocking

Abstract : We show that fore-aft asymmetry, a generic feature of living organisms and some active matter systems, can have a strong influence on the collective properties of even the simplest flocking models. Specifically, an arbitrarily weak asymmetry favoring front neighbors changes qualitatively the phase diagram of the Vicsek model. A region where many sharp traveling band solutions coexist is present at low noise strength, below the Toner-Tu liquid, at odds with the phase-separation scenario well describing the usual isotropic model. Inside this region, a “banded-liquid” phase with algebraic density distribution coexists with band solutions. Linear stability analysis at the hydrodynamic level suggests that these results are generic and not specific to the Vicsek model.
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Submitted on : Thursday, September 21, 2017 - 5:32:17 PM
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Chen Qiu-Shi, Aurelio Patelli, Hugues Chaté, Yu-Qiang Ma, Xia-Qing Shi. Fore-aft asymmetric flocking. Physical Review E , American Physical Society (APS), 2017, 96, pp.20601. ⟨10.1103/PhysRevE.96.020601⟩. ⟨cea-01591666⟩

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