论文标题
脉动主动物质
Pulsating active matter
论文作者
论文摘要
我们揭示了局部同步颗粒的机械脉动是传播变形波的一般途径。我们考虑了一种致密的驱动性颗粒的模型，其活性驱动了每个个体大小的周期性变化。该动力学的灵感来自生物组织，其中细胞消耗燃料以维持主动变形。我们表明，排斥和同步之间的竞争触发了不稳定的不稳定，从而促进了许多动态模式，从螺旋波到缺陷湍流。我们确定模式出现的基础机制，并表征相应的过渡。通过粗糙的动力学，我们提出了对脉动颗粒组装的流体动力描述，并与反应扩散系统讨论了类比。
We reveal that the mechanical pulsation of locally synchronised particles is a generic route to propagate deformation waves. We consider a model of dense repulsive particles whose activity drives periodic change in size of each individual. The dynamics is inspired by biological tissues where cells consume fuel to sustain active deformation. We show that the competition between repulsion and synchronisation triggers an instability which promotes a wealth of dynamical patterns, ranging from spiral waves to defect turbulence. We identify the mechanisms underlying the emergence of patterns, and characterize the corresponding transitions. By coarse-graining the dynamics, we propose a hydrodynamic description of an assembly of pulsating particles, and discuss an analogy with reaction-diffusion systems.
