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arXiv 1106.0458cond-mat.stat-mech
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对数势中扩散平衡的探讨

Approach to equilibrium of diffusion in a logarithmic potential

Ori Hirschberg, David Mukamel, Gunter M. Schütz

摘要:

本文计算了任意初始条件下一维对数势场中粒子扩散的后期分布函数P(x,t)。我们找到了一个具有三个令人惊讶的功能的缩放解决方案:(i)解由两种不同的标度形式给出,对应于扩散(x ~ t^(1/2))和亚扩散(x ~ t^γ,其中给定γ < 1/2)长度尺度,(ii)由初始条件选择总体尺度函数,以及(iii)取决于初始条件的尾部,发现表征缩放函数的缩放指数表现出从连续变化到固定值的转变。

英文摘要:

The late-time distribution function P(x,t) of a particle diffusing in a one-dimensional logarithmic potential is calculated for arbitrary initial conditions. We find a scaling solution with three surprising features: (i) the solution is given by two distinct scaling forms, corresponding to a diffusive (x ~ t^(1/2)) and a subdiffusive (x ~ t^γ with a given γ < 1/2) length scale, respectively, (ii) the overall scaling function is selected by the initial condition, and (iii) depending on the tail of the initial condition, the scaling exponent which characterizes the scaling function is found to exhibit a transition from a continuously varying to a fixed value.

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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