论文标题
越来越密集的活动物质和软驱动玻璃之间的类比
Analogies between growing dense active matter and soft driven glasses
论文作者
论文摘要
我们开发了一个最小的模型，以描述由生物组织，细菌菌落和生物膜等日益加密的活性物质，这些物质是由粒子分裂和空间抑制之间的竞争驱动的。我们提供了集体和单个粒子动力学的详细数值分析。我们表明，微观动力学可以理解为由于全球增长而引起的仿射径向成分的叠加，并且具有更复杂的非植物成分，该成分显示出典型的驱动柔软玻璃材料的特征，例如衰老，压缩的指数衰减的时间相关功能，以及从短量表中的超时性行为，在较大的sceles sceles sceleds sceles sceles scelece sceles seceles severe seceel seceles scelece scelece sceless severe scelece severe severs seapdiff sceles seapdiff sceles seade sece sipdece seapdiff的行为较大。这种类比之所以出现，是因为微观粒子的粒子划分导致全局膨胀，然后在软驱动玻璃中扮演类似于剪切流的作用。我们得出的结论是，越来越密集的活性物质和剪切密集的悬浮液可以通过相同的基本物理学来描述。
We develop a minimal model to describe growing dense active matter such as biological tissues, bacterial colonies and biofilms, that are driven by a competition between particle division and steric repulsion. We provide a detailed numerical analysis of collective and single particle dynamics. We show that the microscopic dynamics can be understood as the superposition of an affine radial component due to the global growth, and of a more complex non-affine component which displays features typical of driven soft glassy materials, such as aging, compressed exponential decay of time correlation functions, and a crossover from superdiffusive behaviour at short scales to subdiffusive behaviour at larger scales. This analogy emerges because particle division at the microscale leads to a global expansion which then plays a role analogous to shear flow in soft driven glasses. We conclude that growing dense active matter and sheared dense suspensions can generically be described by the same underlying physics.
