论文标题
集体运动的度量和拓扑模型中波动引起的相位分离
Fluctuation-induced phase separation in metric and topological models of collective motion
论文作者
论文摘要
我们研究噪声对干燥活性物质过渡到集体运动的性质的作用。从预测确定性级别连续过渡的现场理论开始，我们表明波动会导致顺序发作的密度依赖性转移，这反过来改变了过渡的性质变为相分开的情况。我们的结果适用于一系列系统，包括颗粒与固定数量最近的邻居相互作用的拓扑模型，据信这些邻居据信这表现出连续的顺序发作。通过波动流体动力学和微观模型的数值模拟，我们的分析预测证实了我们的分析预测。
We study the role of noise on the nature of the transition to collective motion in dry active matter. Starting from field theories that predict a continuous transition at the deterministic level, we show that fluctuations induce a density-dependent shift of the onset of order, which in turns changes the nature of the transition into a phase-separation scenario. Our results apply to a range of systems, including the topological models in which particles interact with a fixed number of nearest neighbors, which were believed so far to exhibit a continuous onset of order. Our analytical predictions are confirmed by numerical simulations of fluctuating hydrodynamics and microscopic models.
