Nonlinear Dynamics of Active Matter

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  • Ohta Takao
    東京大学大学院理学系研究科:豊田理化学研究所

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Other Title
  • アクティブマターの非線形ダイナミクス （解説）
  • アクティブマターの非線形ダイナミクス
  • アクティブマター ノ ヒセンケイ ダイナミクス

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Abstract

Recently, the dynamics of active matter has attracted much attention from the view point of nonlinear and nonequilibrium physics. In this article, we discuss the coupling between deformations and migration of an isolated self-propelled particle and the collective dynamics of interacting particles. In the individual dynamics, we found four basic motions, that is, rectilinear, circular, zig-zag and chaotic motions in two dimensions. In the collective dynamics, Chate and his coworkers found, by numerical simulations of the Vicsek model of self-propelled point particles, traveling band structures and giant density fluctuations in a two-dimensional ordered state. The latter is consistent with the theoretical results predicted by Toner and Tu in the coarse-grained hydrodynamical approach. If deformability of particles is taken into account, traveling bands are found to survive head-on collisions.

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  • Butsuri

    Butsuri 70 (5), 347-355, 2015-05-05

    The Physical Society of Japan

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