发表机构
Indian Association for the Cultivation of Science（印度科学培养印度协会）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
研究三维活性Potts模型的相分离与亚稳定性，发现高推进速度下极性液体呈亚稳，横向液滴可完全改变极性态。
AI 中文摘要
我们在具有2、4和6个取向态的立方格点上研究三维活性Potts模型（APM）。稳态相图表现出低密度气态、高密度极性液态以及液-气共存相，其相行为由密度、温度和推进速度控制，并保留了先前研究的二维APM的主要特征。在弱推进下，稠密相形成垂直于其运动方向的板状结构。随着推进速度的增加，这种形貌在2态模型中持续存在，而4态和6态模型的稠密相则重新取向并沿其纵向方向传播。对于6态模型，重新取向的稠密相进一步发展为圆柱形形貌。我们还利用微观模拟和粗粒化流体动力学方程考察了极性液体对人为引入液滴的稳定性。在高推进速度下，反向传播的液滴能部分改变初始极性态，而横向液滴能完全改变它，从而证明了三维活性Potts模型中极性液体的亚稳性质。
英文摘要
We study the three-dimensional active Potts model (APM) on a cubic lattice with 2, 4, and 6 orientational states. The steady-state phase diagrams exhibit low-density gaseous, high-density polar liquid, and liquid--gas coexistence phases, with the phase behavior controlled by density, temperature, and propulsion speed and retaining the main features of the previously studied two-dimensional APM. At weak propulsion, the dense phase forms a slab perpendicular to its direction of motion. With increasing propulsion speed, this morphology persists for the 2-state model, whereas the dense phases for 4 and 6 states reorient and propagate along their longitudinal direction. For the 6-state model, the reoriented dense phase further develops a cylindrical morphology. We also examine the stability of polar liquids against artificially introduced droplets using microscopic simulations and coarse-grained hydrodynamic equations. At high propulsion speeds, counter-propagating droplets can partially modify the initial polar state, while transverse droplets can completely alter it, demonstrating the metastable nature of polar liquids in the three-dimensional active Potts model.
Comments12 pages, 10 figures
