Mokshin Anatolii V, Fairushin Ilnaz I, Tkachenko Igor M
Department of Computational Physics, Institute of Physics, Kazan Federal University, 420008 Kazan, Russia.
Departament de Matemàtica Aplicada, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain.
Phys Rev E. 2022 Feb;105(2-2):025204. doi: 10.1103/PhysRevE.105.025204.
The self-consistent relaxation theory is employed to describe the collective ion dynamics in strongly coupled Yukawa classical one-component plasmas. The theory is applied to equilibrium states corresponding to intermediate screening regimes with appropriate values of the structure and coupling parameters. The information about the structure (the radial distribution function and the static structure factor) and the thermodynamics of the system are sufficient to describe collective dynamics over a wide range of spatial scales, namely, from the extended hydrodynamic to the microscopic dynamics scale. The main experimentally measurable characteristics of the equilibrium collective dynamics of ions-the spectrum of the dynamic structure factor, the dispersion parameters, the speed of sound, and the sound attenuation-are determined within the framework of the theory without using any adjustable parameters. The results demonstrate agreement with molecular dynamics simulations. Thus a direct realization is presented of the key idea of statistical mechanics: for the theoretical description of the collective particle dynamics in equilibrium fluids it is sufficient to know the interparticle interaction potential and the structural characteristics. Comparison with alternative or complementary theoretical approaches is provided.
自洽弛豫理论用于描述强耦合汤川经典单组分等离子体中的集体离子动力学。该理论应用于与具有适当结构和耦合参数值的中间屏蔽区域相对应的平衡态。有关系统结构（径向分布函数和静态结构因子）和热力学的信息足以描述广泛空间尺度上的集体动力学，即从扩展的流体动力学到微观动力学尺度。离子平衡集体动力学的主要实验可测量特征——动态结构因子的谱、色散参数、声速和声衰减——在该理论框架内确定，无需使用任何可调参数。结果表明与分子动力学模拟一致。因此，统计力学的关键思想得到了直接实现：对于平衡流体中集体粒子动力学的理论描述，只需知道粒子间相互作用势和结构特征即可。还提供了与替代或互补理论方法的比较。
