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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/192654

Small obstacle in a large polar flock

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We show that arbitrarily large polar flocks are susceptible to the presence of a single small obstacle. In a wide region of parameter space, the obstacle triggers counterpropagating dense bands leading to reversals of the flow. In very large systems, these bands interact, yielding a never-ending chaotic dynamics that constitutes a new disordered phase of the system. While most of these results were obtained using simulations of aligning self-propelled particles, we find similar phenomena at the continuous level, not when considering the basic Toner-Tu hydrodynamic theory, but in simulations of truncations of the relevant Boltzmann equation.

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CODINA, Joan, MAHAULT, Benoît, DOBNIKAR, Jure, PAGONABARRAGA MORA, Ignacio, SHI, Xia-qing, CHATÉ, Hugues. Small obstacle in a large polar flock. _Physical Review Letters_. 2022. Vol. 128, núm. 21, pàgs. 218001-1 -218001-6. [consulta: 23 de gener de 2026]. ISSN: 0031-9007. [Disponible a: https://hdl.handle.net/2445/192654]

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