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arXiv 1505.04572cond-mat.stat-mech
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单个文件扩散中示踪剂位置的大偏差函数

Large deviation function of a tracer position in single file diffusion

Tridib Sadhu, Bernard Derrida

摘要:

在拥挤的一维通道中的不可穿透的颗粒的扩散被称为单列扩散。粒子不会彼此通过,并且每个单独粒子的位移是亚扩散的。我们分析了一个简单的实现,这个单行扩散问题的一维布朗点粒子相互作用只有硬核排斥。我们表明,大的偏差函数,其特征在于在大的时间示踪剂的位移可以计算通过映射到一个问题的非相互作用的布朗粒子。我们确认最近得到的结果的一个时间分布的位移,并显示如何将它们扩展到多时间的相关性。示踪剂位置的概率分布取决于我们取的是退火平均值还是淬火平均值。在猝灭的情况下,我们注意到示踪剂的分布和电流的分布之间的精确关系。这种关系实际上更一般,并且对于任意单个文件扩散都是有效的。它特别允许得到的对称简单排斥过程(SSEP)在密度1/2的淬火情况下的示踪剂位置的完整统计。

英文摘要:

Diffusion of impenetrable particles in a crowded one-dimensional channel is referred as the single file diffusion. The particles do not pass each other and the displacement of each individual particle is sub-diffusive. We analyse a simple realization of this single file diffusion problem where one dimensional Brownian point particles interact only by hard-core repulsion. We show that the large deviation function which characterizes the displacement of a tracer at large time can be computed via a mapping to a problem of non-interacting Brownian particles. We confirm recently obtained results of the one time distribution of the displacement and show how to extend them to the multi-time correlations. The probability distribution of the tracer position depends on whether we take annealed or quenched averages. In the quenched case we notice an exact relation between the distribution of the tracer and the distribution of the current. This relation is in fact much more general and would be valid for arbitrary single file diffusion. It allows in particular to get the full statistics of the tracer position for the symmetric simple exclusion process (SSEP) at density 1/2 in the quenched case.

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