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arXiv 1702.08182cond-mat.stat-mechcond-mat.dis-nn
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广义Langevin方程的模型解:液体单粒子动力学中时标不变性的出现和破缺

A model solution of the generalized Langevin equation: Emergence and Breaking of Time-Scale Invariance in Single-Particle Dynamics of Liquids

Anatolii V. Mokshin, Bulat N. Galimzyanov

摘要:

结果表明,广义Langevin方程的解可以在简单比较粒子(原子、分子)速度自相关函数的时间尺度和相应的记忆函数的时间尺度的基础上得到。速度自相关函数的结果表达式包含对非马尔可夫参数的依赖,这使得人们可以考虑所研究的现象的记忆效应。对液态锡和液态锂的计算表明,所得到的速度自相关函数表达式与分子动力学模拟的结果符合得很好。

英文摘要:

It is shown that the solution of generalized Langevin equation can be obtained on the basis of simple comparison of the time scale for the velocity autocorrelation function of a particle (atom, molecule) and of the time scale for the corresponding memory function. The result expression for the velocity autocorrelation function contains dependence on the non-Markovity parameter, which allows one to take into account memory effects of the investigated phenomena. It is demonstrated for the cases of liquid tin and liquid lithium that the obtained expression for the velocity autocorrelation function is in a good agreement with the molecular dynamics simulation results.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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