被动与活性粒子致密混合物中的剧烈相分离
Aggressive Phase Separation in Dense Mixtures of Passive and Active Particles
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中文总结 AI 辅助
采用类Vicsek自推进规则研究被动与活性粒子混合物的液-液相分离动力学，发现畴生长指数强烈依赖最终状态点，特定参数下可实现指数级快速生长，对生物群集和机器人群体有实际意义。
中文摘要 AI 辅助
我们采用类Vicsek自推进规则，研究了被动与活性粒子混合物中液-液相分离的动力学。对于从均匀构型温度淬火至相图不混溶区的演化过程，我们发现了畴生长指数对最终状态点选择的显著强依赖。这种奇异依赖性表明，在合适的系统参数选择下，甚至可能出现指数级快速生长。尽管整体混合物密度相当高，存在拥堵风险并可能减缓粒子输运，但这一惊人观察结果得到了有限尺寸标度及其他高级分析的支持。从纯生物系统中的群集现象到机器人群体，这些结果具有广泛的实际意义。我们讨论了适用于解释这种高生长速率的理论框架，并探讨了速度场中的粗化过程，以描述密度场粗化如何跟随速度场粗化。
英文摘要
Using Vicsek-like self-propulsion rule, we study kinetics of liquid-liquid phase separation in mixtures of passive and active particles. For evolutions following temperature quenches of homogeneous configurations to the immiscible region of the phase diagram, we identify a remarkably strong dependence of the domain growth exponent on the choice of final state point. The singular dependence is indicative of the possibility of even an exponentially fast growth for suitable choices of system parameters. This striking observation, supported by finite-size scaling and other advanced analyses, is despite the fact that the overall mixture density is quite high that risks congestion with the prospect of slowing down particle transport. From flocking in pure biological systems to robotic swarming, these results are of much practical relevance. Theoretical pictures suitable for interpreting such high growth rates are discussed. In this regard, we discuss coarsening in the velocity field as well that describes how the density field coarsening follows the latter.
发表机构
- Theoretical Sciences Unit and School of Advanced Materials, Jawaharlal Nehru Centre for Advanced Scientific Research（贾瓦哈拉尔·尼赫鲁高级科学研究中心理论与材料学院）
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