Fluctuation induced network patterns in active matter with spatially correlated noise.

IF 2.9 3区 化学 Q3 CHEMISTRY, PHYSICAL
Soft Matter Pub Date : 2025-06-13 DOI:10.1039/d5sm00245a
Sebastian Fehlinger, Kai Cui, Arooj Sajjad, Heinz Koeppl, Benno Liebchen
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引用次数: 0

Abstract

Fluctuations play a central role in many fields of physics, from quantum electrodynamics to statistical mechanics. In active matter physics, most models focus on thermal fluctuations due to a surrounding solvent. An alternative but much less explored noise source can occur due to fluctuating external fields, which typically feature certain spatial correlations. In this work, we introduce a minimal model to explore the influence of spatially correlated but temporally uncorrelated noise on the collective behaviour of active particles. We find that specifically in chiral active particles such fluctuations induce the formation of network patterns, which neither occur for spatially (uncorrelated) thermal noise, nor in the complete absence of fluctuations. These networks show (i) a percolated structure, (ii) local alignment of the contained particles, but no global alignment, and (iii) hardly coarsen. We perform a topological data analysis to systematically characterize the topology of the network patterns. Our work serves as a starting point to explore the role of spatially correlated fluctuations and presents a route towards noise-induced phenomena in active matter.

具有空间相关噪声的活性物质波动诱导的网络模式。
从量子电动力学到统计力学,波动在物理学的许多领域都起着核心作用。在活性物质物理学中,大多数模型关注由于周围溶剂引起的热波动。由于波动的外场通常具有一定的空间相关性,因此可能出现另一种但较少探索的噪声源。在这项工作中,我们引入了一个最小模型来探索空间相关但时间不相关的噪声对活性粒子集体行为的影响。我们发现,特别是在手性活性粒子中,这种波动诱导了网络模式的形成,这种网络模式既不会发生在空间(不相关)热噪声中,也不会发生在完全没有波动的情况下。这些网络表现出(i)渗透结构,(ii)包含粒子的局部排列,但没有全局排列,(iii)几乎没有粗化。我们执行拓扑数据分析,以系统地表征网络模式的拓扑结构。我们的工作是探索空间相关波动的作用的起点,并提出了一条研究活性物质中噪声诱发现象的途径。
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来源期刊
Soft Matter
Soft Matter 工程技术-材料科学:综合
CiteScore
6.00
自引率
5.90%
发文量
891
审稿时长
1.9 months
期刊介绍: Soft Matter is an international journal published by the Royal Society of Chemistry using Engineering-Materials Science: A Synthesis as its research focus. It publishes original research articles, review articles, and synthesis articles related to this field, reporting the latest discoveries in the relevant theoretical, practical, and applied disciplines in a timely manner, and aims to promote the rapid exchange of scientific information in this subject area. The journal is an open access journal. The journal is an open access journal and has not been placed on the alert list in the last three years.
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