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arXiv 1209.3161cond-mat.dis-nn
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无序系统临界行为中的雪崩和降维击穿

Avalanches and dimensional reduction breakdown in the critical behavior of disordered systems

Gilles Tarjus, Maxime Baczyk, Matthieu Tissier

摘要:

我们调查之间的连接的一个正式的属性的临界行为的几个系统中存在的淬火无序,被称为“降维”,并在相同的系统中存在于零温度的集体事件被称为“雪崩”。雪崩一般产生重正化无序的累积量的函数依赖性的nonanalyticities。我们表明,这导致故障的降维预测当且仅当分形维数表征的雪崩的标度特性是完全等于空间的尺寸和标度尺寸的主要字段,例如,磁化强度在随机场模型之间的差异。结合标度理论和泛函重整化群证明了这一点。因此,我们澄清的难题,为什么降维仍然有效的随机场系统以上的非平凡尺寸(但失败以下),总是适用于统计的支化聚合物,总是错误的界面在一个随机环境中的弹性模型。

英文摘要:

We investigate the connection between a formal property of the critical behavior of several systems in the presence of quenched disorder, known as "dimensional reduction", and the presence in the same systems at zero temperature of collective events known as "avalanches". Avalanches generically produce nonanalyticities in the functional dependence of the cumulants of the renormalized disorder. We show that this leads to a breakdown of the dimensional reduction predictions if and only if the fractal dimension characterizing the scaling properties of the avalanches is exactly equal to the difference between the dimension of space and the scaling dimension of the primary field, e.g. the magnetization in a random field model. This is proven by combining scaling theory and functional renormalization group. We therefore clarify the puzzle of why dimensional reduction remains valid in random field systems above a nontrivial dimension (but fails below), always applies to the statistics of branched polymer and is always wrong in elastic models of interfaces in a random environment.

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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