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arXiv 1401.6919cond-mat.stat-mech
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无序条件下的退钉扎相变:一个玩具模型

The depinning transition in presence of disorder: a toy model

Bernard Derrida, Martin Retaux

摘要:

我们介绍了一个玩具模型,它代表了一个简化版本的问题的脱钉过渡的限制强无序。这个玩具模型可以用公式表示为单个实变量概率分布的简单重正化变换。对于这个玩具模型,{临界线在一个特定的情况下是确切知道的},它可以在一般情况下微扰计算。我们还可以证明,在跃迁处,没有强无序的固定分布可以通过重整化得到。相反,我们的数值和分析方法都表明了无限阶的过渡(Berezinskiii-Kosterlitz-无边界型)。我们给出的数值证据表明,这种无限的顺序过渡仍然存在的问题的脱钉过渡与无序的分级晶格。

英文摘要:

We introduce a toy model, which represents a simplified version of the problem of the depinning transition in the limit of strong disorder. This toy model can be formulated as a simple renormalization transformation for the probability distribution of a single real variable. For this toy model, {the critical line is known exactly in one particular case} and it can be calculated perturbatively in the general case. One can also show that, at the transition, there is no strong disorder fixed distribution accessible by renormalization. Instead, both our numerical and analytic approaches indicate a transition of infinite order (of the Berezinskii-Kosterlitz-Thouless type). We give numerical evidence that this infinite order transition persists for the problem of the depinning transition with disorder on the hierarchical lattice.

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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