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- W2907967967 abstract "We present a comprehensive theory of the dynamics and fluctuations of a two-dimensional suspension of polar active particles in an incompressible fluid confined to a substrate. We show that, depending on the sign of a single parameter, a state with polar orientational order is anomalously stable (or anomalously unstable), with a nonzero relaxation (or growth) rate for angular fluctuations at zero wavenumber. This screening of the broken-symmetry mode in the stable state does lead to conventional rather than giant number fluctuations as argued by Bricard et al., Nature ${bf 503}$, 95 (2013), but their bend instability in a splay-stable flock does not exist and the polar phase has long-range order in two dimensions. Our theory also describes confined three-dimensional thin-film suspensions of active polar particles as well as dense compressible active polar rods, and predicts a flocking transition without a banding instability" @default.
- W2907967967 created "2019-01-11" @default.
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- W2907967967 date "2020-01-16" @default.
- W2907967967 modified "2023-10-17" @default.
- W2907967967 title "Swimmer Suspensions on Substrates: Anomalous Stability and Long-Range Order" @default.
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- W2907967967 doi "https://doi.org/10.1103/physrevlett.124.028002" @default.
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- W2907967967 hasPublicationYear "2020" @default.
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