论文标题

活动粒子集体中的信息和运动交换

Information and motility exchange in collectives of active particles

论文作者

Paoluzzi, Matteo, Leoni, Marco, Marchetti, M Cristina

论文摘要

我们在运行式活动粒子的模型中检查了运动和信息交换的相互作用,其中将粒子的运动能力编码为一些信息,这些信息可以根据电路中的规则和和 /或逻辑门在接触时进行交换。与非运动粒子接触后,运动和颗粒变成了非运动。相反,在与非运动员对应物发生碰撞时,机动性或颗粒保持动力。以及已成为非运动的颗粒,即以固定速度$μ$恢复其运动性,如SIS(易感性,感染,易感性)流行传播的模型,感染剂可以再次健康,但对最近的感染没有记忆力,因此它对骨髓性的感染不易记忆。对于$μ= 0 $,无论是和 / /或颗粒,分别以不可逆转的方式放松,以吸收所有非运动或所有运动颗粒的态。然而,对于在整个过程中保持活性的颗粒的弛豫动力学速度更快。在有限的$μ$下,动力学和动力学受唤醒和碰撞速率之间的相互作用控制。该系统以$>μ_c$的态度演变为所有运动颗粒的状态(一种吸收相变的语言的吸收状态),并以$μ<μ_c$ $μ_c$的$>μ_c$和带有共存的运动和非运动颗粒的混合状态(具有吸收相变的语言的活性状态)。最终状态表现出由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中的生化信号传导有关,流行病和社会共识的传播以及活跃胶体的光控制组织。

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 $μ>μ_c$ and to a mixed state with coexisting motile and non-motile particles (an active state in the language of absorbing phase transitions) for $μ<μ_c$. 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.

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