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Fluctuation theory of single-file diffusion

机译:单文件扩散的涨落理论

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摘要

In a one-dimensional suspension of Brownian particles, which cannot pass each other, the meansquare displacement of a selected particle grows at long times with the square root of time, ratherthan linearly. It is shown that the coefficient of the square root, the so-called single-file mobility, canbe derived from fluctuation theory, involving the velocity time scale and the fluctuation-dissipationtheorem. The single-file mobility is expressed in terms of the collective diffusion coefficient and theisothermal osmotic compressibility, in agreement with the result derived earlier by Kollmann onthe basis of the generalized Smoluchowski equation [M. Kollmann, Phys. Rev. Lett. 90, 180602(2003)].
机译:在无法相互通过的一维布朗粒子悬浮中,所选粒子的均方位移会随着时间的平方根长时间增长,而不是线性增长。结果表明,平方根的系数,即所谓的单文件迁移率,可以从涨落理论中得出,涉及速度时标和涨落耗散定理。单文件迁移率用集体扩散系数和等温渗透性可压缩性表示,这与Kollmann先前基于广义Smoluchowski方程[M.科尔曼,物理学。牧师90,180602(2003)]。

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