论文标题
运动粒子的大规模武器模拟中运动性诱导的临界点的通用类别类别
Universality class of the motility-induced critical point in large scale off-lattice simulations of active particles
论文作者
论文摘要
我们对经历运动性诱导的相位分离（MIPS）的活性颗粒的非晶格二维模型进行大规模计算机模拟，以研究接近MIPS曲线临界点的系统临界行为。通过对大型系统大小进行采样稳态配置并执行有限尺寸缩放分析，我们提供了详尽的证据，表明该活动系统的关键行为属于Ising通用性类别。除了被动系统典型的缩放观测值外，我们还研究了两个活动阶段之间动力学温度差的临界行为。该数量在平衡中始终为零，而是在活动系统中显示出临界行为，该行为由顺序参数的同一指数与平均场理论一致。
We perform large-scale computer simulations of an off-lattice two-dimensional model of active particles undergoing a motility-induced phase separation (MIPS) to investigate the systems critical behaviour close to the critical point of the MIPS curve. By sampling steady-state configurations for large system sizes and performing finite size scaling analysis we provide exhaustive evidence that the critical behaviour of this active system belongs to the Ising universality class. In addition to the scaling observables that are also typical of passive systems, we study the critical behaviour of the kinetic temperature difference between the two active phases. This quantity, which is always zero in equilibrium, displays instead a critical behavior in the active system which is well described by the same exponent of the order parameter in agreement with mean-field theory.
