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arXiv 2201.04902cond-mat.softcond-mat.stat-mech
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稠密持久粒子集合体中的无序集体运动

Disordered collective motion in dense assemblies of persistent particles

Yann-Edwin Keta, Robert L. Jack, Ludovic Berthier

摘要:

我们探讨了无序的非热活性物质的非平衡集体运动的出现时,持续运动和拥挤效应的竞争,使用模拟的二维模型的大小多分散的自推进粒子。与单分散系统形成鲜明对比,我们发现多分散性可以在任意大的持续时间内稳定均匀的活性液体,其特征是显着的速度相关性和不规则的湍流。对于所有的持久性值,活性流体在大密度下经历非平衡玻璃化转变。这是伴随着集体运动,其性质从近平衡的空间异质动态小持久性,持久性大时,一个质的不同的间歇性动态演变。后一种状态涉及相关位移场的复杂时间演化

英文摘要:

We explore the emergence of nonequilibrium collective motion in disordered non-thermal active matter when persistent motion and crowding effects compete, using simulations of a two-dimensional model of size polydisperse self-propelled particles. In stark contrast with monodisperse systems, we find that polydispersity stabilizes a homogeneous active liquid at arbitrary large persistence times, characterized by remarkable velocity correlations and irregular turbulent flows. For all persistence values, the active fluid undergoes a nonequilibrium glass transition at large density. This is accompanied by collective motion, whose nature evolves from near-equilibrium spatially heterogeneous dynamics at small persistence, to a qualitatively different intermittent dynamics when persistence is large. This latter regime involves a complex time evolution of the correlated displacement field

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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