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arXiv 1106.4401physics.plasm-phcond-mat.stat-mech
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经典单组分等离子体的记忆函数和动态局域场修正的比较

Comparative merits of the memory function and dynamic local field correction of the classical one-component plasma

James P. Mithen, Jérôme Daligault, G. Gregori

摘要:

通过研究波矢和频率相关的动力学量:动力学结构因子(DSF)和动力学局域场修正(LFC),探讨了经典单组分等离子体(OCP)的液体和等离子体描述的互补性。精确的分子动力学(MD)模拟用于验证/测试DSF和LFC模型。我们的模拟,跨越整个流体政权($Γ= 0.1 - 175$),表明DSF是非常好的代表一个简单的和众所周知的记忆函数模型的广义流体力学。另一方面,LFC,这是我们第一次使用MD计算,现有的模型没有很好地描述。

英文摘要:

The complementarity of the liquid and plasma descriptions of the classical one-component plasma (OCP) is explored by studying wavevector and frequency dependent dynamical quantities: the dynamical structure factor (DSF), and the dynamic local field correction (LFC). Accurate Molecular Dynamics (MD) simulations are used to validate/test models of the DSF and LFC. Our simulations, which span the entire fluid regime ($Γ= 0.1 - 175$), show that the DSF is very well represented by a simple and well known memory function model of generalized hydrodynamics. On the other hand, the LFC, which we have computed using MD for the first time, is not well described by existing models.

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