论文标题

活性和被动颗粒混合物的相位场晶体模型的推导和分析

Derivation and analysis of a phase field crystal model for a mixture of active and passive particles

论文作者

Vrugt, Michael te, Holl, Max Philipp, Koch, Aron, Wittkowski, Raphael, Thiele, Uwe

论文摘要

我们讨论了一个活跃的相位晶体(PFC)模型,该模型描述了活性和被动颗粒的混合物。首先,提出了来自动力学密度功能理论(DDFT)的微观衍生,其中包括对相关定向自由度的系统处理。特别有趣的是构建非线性和耦合术语。这允许对PFC模型中用于活性颗粒和混合物的现象学结构的显微镜理由,获得的显着见解,获取它们所需的近似值以及可能的概括。其次,使用线性稳定性分析和非线性方法研究了派生模型。发现该模型允许具有丰富的非线性行为,其状态从稳定的周期性和局部状态到各种时周期状态。后者包括站立,行进和调节波,对应于空间周期性和局部行进,摇摆,峰值模式及其组合。

We discuss an active phase field crystal (PFC) model that describes a mixture of active and passive particles. First, a microscopic derivation from dynamical density functional theory (DDFT) is presented that includes a systematic treatment of the relevant orientational degrees of freedom. Of particular interest is the construction of the nonlinear and coupling terms. This allows for interesting insights into the microscopic justification of phenomenological constructions used in PFC models for active particles and mixtures, the approximations required for obtaining them, and possible generalizations. Second, the derived model is investigated using linear stability analysis and nonlinear methods. It is found that the model allows for a rich nonlinear behavior with states ranging from steady periodic and localized states to various time-periodic states. The latter include standing, traveling, and modulated waves corresponding to spatially periodic and localized traveling, wiggling, and alternating peak patterns and their combinations.

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