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Spiral and never-settling patterns in active systems

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Original languageEnglish
Article number012711
JournalPhysical Review E - Statistical, Nonlinear and Soft Matter Physics
Volume89
Issue number1
DOIs
Publication statusPublished - 17 Jan 2014

Abstract

We present a combined numerical and analytical study of pattern formation in an active system where particles align, possess a density-dependent motility, and are subject to a logistic reaction. The model can describe suspensions of reproducing bacteria, as well as polymerizing actomyosin gels in vitro or in vivo. In the disordered phase, we find that motility suppression and growth compete to yield stable or blinking patterns, which, when dense enough, acquire internal orientational ordering to give asters or spirals. We predict these may be observed within chemotactic aggregates in bacterial fluids. In the ordered phase, the reaction term leads to previously unobserved never-settling patterns which can provide a simple framework to understand the formation of motile and spiral patterns in intracellular actin systems.

ID: 16192971