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Information and motility exchange in collectives of active particles.
Soft Matter ( IF 3.4 ) Pub Date : 2020-06-15 , DOI: 10.1039/d0sm00204f
Matteo Paoluzzi 1 , Marco Leoni 2 , M Cristina Marchetti 3
Affiliation  

We examine the interplay of motility and information exchange in a model of run-and-tumble active particles where the particle's motility is encoded as a bit of information that can be exchanged upon contact according to the rules of AND and OR logic gates in a circuit. Motile AND particles become non-motile upon contact with a non-motile particle. Conversely, motile OR particles remain motile upon collision with their non-motile counterparts. AND particles that have become non-motile additionally “reawaken”, i.e., recover their motility, at a fixed rate μ, as in the SIS (susceptible, infected, susceptible) model of epidemic spreading, where an infected agent can become healthy again, but keeps no memory of the recent infection, hence it is susceptible to a renewed infection. For μ = 0, both AND and OR particles relax irreversibly to absorbing states of all non-motile or all motile particles, respectively. The relaxation kinetics is, however, faster for OR particles that remain active throughout the process. At finite μ, the AND dynamics is controlled by the interplay between reawakening and collision rates. The system evolves to a state of all motile particles (an absorbing state in the language of absorbing phase transitions) for μ > μc and to a mixed state with coexisting motile and non-motile particles (an active state in the language of absorbing phase transitions) for μ < μc. The final state exhibits a rich structure controlled by motility-induced aggregation. Our work can be relevant to biochemical signaling in motile bacteria, the spreading of epidemics and of social consensus, as well as light-controlled organization of active colloids.

中文翻译:

活性粒子集合中的信息和动力交换。

我们在运行和滚动的活动粒子模型中检查了运动性和信息交换之间的相互作用,其中颗粒的运动性被编码为可以根据电路中“与”或“或”逻辑门的规则在接触时交换的一点信息。与非运动性颗粒接触后,运动性AND颗粒变为非运动性。相反,能动的OR粒子在与非能动的对应物碰撞时仍保持能动。已变为非运动状态的AND粒子会额外“唤醒”,以固定速率μ恢复其运动能力,如SIS(易感,感染,易感)流行病传播模型一样,其中被感染的病原体可以再次变得健康,但不会保留最近感染的记忆,因此很容易再次感染。对于μ = 0,AND和OR粒子都不可逆地松弛,分别吸收所有非运动粒子或所有运动粒子的吸收状态。但是,对于在整个过程中保持活性的OR粒子,松弛动力学更快。在有限的μ处,AND动态由重新唤醒和碰撞率之间的相互作用控制。系统发展到所有能动粒子的状态(在吸收相变的语言中的吸收状态)μ > μ Ç并混合的状态与共存的活动和不动的微粒(在吸收阶段的语言活动状态转换)为μ < μ ç。最终状态显示出受运动诱导的聚集控制的丰富结构。我们的工作可能与运动细菌的生化信号传递,流行病的传播和社会共识以及活性胶体的光控组织有关。
更新日期:2020-07-15
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