Intermittent Attractive Interactions Lead to Microphase Separation in Non-motile Active Matter
arXiv:2201.04091 · doi:10.1103/PhysRevE.106.034603
Abstract
Non-motile active matter exhibits a wide range of non-equilibrium collective phenomena yet examples are crucially lacking in the literature. We present a microscopic model inspired by the bacteria {\it Neisseria Meningitidis} in which diffusive agents feel intermittent attractive forces. Through a formal coarse-graining procedure, we show that this truly scalar model of active matter exhibits the time-reversal-symmetry breaking terms defining the {\it Active Model B+} class. In particular, we confirm the presence of microphase separation by solving the kinetic equations numerically. We show that the switching rate controlling the interactions provides a regulation mechanism tuning the typical cluster size, e.g. in populations of bacteria interacting via type IV pili.
arXiv comment7 pages (4 figures) of main text plus 12 pages (2 figures) of supplementary information
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