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动力诱导集群的动力学:在奥斯瓦尔德之外变粗 成熟
Claudio B Caporusso1, Leticia F Cugliandolo2,3, Pasquale Digregorio4,5,6
1Dipartimento Interateneo di Fisica, Università degli Studi di Bari and INFN, Sezione di Bari, via Amendola 173, Bari, I-70126, Italy.
Physical review letters
|August 25, 2023
概括
活跃的布朗盘表现出超越奥斯瓦尔德成熟的独特聚合动态,形成具有z=3.3的动态指数的碎形结构. 它们的自我推进驱动器提高了扩散性和复杂的集群形成,与被动系统有很大的不同.
科学领域:
- 软物质物理学 软物质物理学
- 活体物质系统是什么
- 统计力学 统计力学
背景情况:
- 机动性诱导相位分离 (MIPS) 描述了自动运动的粒子如何自发形成密集集群.
- 了解这些星团的动态,包括它们的生长和聚合,对于活性物质研究至关重要.
- 现有的模型通常侧重于奥斯瓦尔德成熟,但活跃系统可能表现出不同的聚合机制.
研究的目的:
- 研究由活跃的布朗盘形成的集群的聚合机制和动态.
- 描述这些集群的增长,并确定影响它们行为的关键参数.
- 将活跃集群的动态与被动系统进行比较,以突出自我推进的作用.
主要方法:
- 开发和应用一种用于追踪集群轨迹的新算法.
- 活跃的布朗盘经历动力诱导相位分离的数值模拟.
- 积极和被动的布朗盘系统之间的比较分析.
主要成果:
- 确定与奥斯瓦尔德成熟不同的一种聚合机制.
- 确定集群增长的动态指数,z=3,在探索的数值时间尺度内.
- 集群自我推进的特征,具有增强的扩散性 (D∼Pe2/√M).
- 观测大型的,分形聚合结构,由不同的六进制序列组成,与较小,均的集群共存.
- 在主动和被动系统动态之间观察到显著的差异.
结论:
- 活跃的布朗盘通过一个超越奥斯瓦尔德成熟的机制聚合,从而形成碎形结构.
- 集群自我推进和增强的扩散性是活跃系统中聚合和复杂形态的关键驱动因素.
- 活跃集群的行为从根本上与被动系统不同,这凸显了新兴现象中活动的重要性.
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