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Collective Motion and Nonequilibrium Cluster Formation in Colonies of Gliding Bacteria

Abstract : We characterize cell motion in experiments and show that the transition to collective motion in colonies of gliding bacterial cells confined to a monolayer appears through the organization of cells into larger moving clusters. Collective motion by nonequilibrium cluster formation is detected for a critical cell packing fraction around 17%. This transition is characterized by a scale-free power-law cluster-size distribution, with an exponent 0.88±0.07, and the appearance of giant number fluctuations. Our findings are in quantitative agreement with simulations of self-propelled rods. This suggests that the interplay of self-propulsion and the rod shape of bacteria is sufficient to induce collective motion.
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https://hal.archives-ouvertes.fr/hal-00905217
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Submitted on : Sunday, November 17, 2013 - 7:41:20 PM
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Fernando Peruani, Joern Starrus, Vladimir Jakovljevic, Lotte Sogaard-Andersen, Andreas Deutsch, et al.. Collective Motion and Nonequilibrium Cluster Formation in Colonies of Gliding Bacteria. Physical Review Letters, American Physical Society, 2012, 108, pp.098102. ⟨10.1103/PhysRevLett.108.098102⟩. ⟨hal-00905217⟩

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