稠密恒星系统和等离子体的多粒子碰撞模拟
Multiparticle collision simulations of dense stellar systems and plasmas
摘要：
我们总结了一系列的碰撞动力学在稠密的恒星系统，如球状星团（GC）和弱碰撞等离子体中使用一种新的模拟技术，所谓的多粒子碰撞（MPC）方法，替代福克-普朗克和蒙特卡罗方法的数值实验。MPC与用于计算自洽长程场的粒子-网格方法有关，确保模拟时间与$N\log N$在粒子数量上成比例，而不是与直接$N$ -体的$N^2$成比例。碰撞弛豫效应是通过基于碰撞算子方法计算粒子相互作用来建模的，该碰撞算子方法确保严格的能量能量守恒和动量，并且仅取决于粒子速度和基于细胞的积分量。
英文摘要：
We summarize a series of numerical experiments of collisional dynamics in dense stellar systems such as globular clusters (GCs) and in weakly collisional plasmas using a novel simulation technique, the so-called Multi-particle collision (MPC) method, alternative to Fokker-Planck and Monte Carlo approaches. MPC is related to particle-mesh approaches for the computation of self consistent long-range fields, ensuring that simulation time scales with $N\log N$ in the number of particles, as opposed to $N^2$ for direct $N$-body. The collisional relaxation effects are modelled by computing particle interactions based on a collision operator approach that ensures rigorous conservation of energy and momenta and depends only on particles velocities and cell-based integrated quantities.
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