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arXiv 2005.02382cond-mat.stat-mechhep-th
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具有KPZ标度的平衡类平均场统计模型

Equilibrium mean-field-like statistical models with KPZ scaling

Alexander Gorsky, Sergei Nechaev, Alexander Valov

摘要:

我们考虑了三个不同的“单体”统计系统,涉及布朗漂移,其中具有的波动Kardar-Parisi-Zhang标度与临界指数$ν=\frac{1}{3}$。在所有的模型中,施加的外部约束将潜在的随机过程推向大偏差区域。具体来说,我们已经考虑了波动:(一)布朗游览非均匀有限树与线性增长的分支起源于平均场近似的Dumitriu-Edelman表示的矩阵模型,(二)(1+1)D“磁”Dyck路径内的带有限宽度,(三)膨胀的理想聚合物环与固定的回转半径。在后一个问题中,切断了长程空间波动,只留下拉伸路径的“典型”模式,我们确保了键波动的KPZ样标度。相反,将所有简正模相加,我们得到高斯行为。在所有考虑的模型中,KPZ波动出现在两个互补的条件下:(i)轨迹被推到相空间的大偏差区域,以及(ii)轨迹靠在不可穿透的边界上。

英文摘要:

We have considered three different "one-body" statistical systems involving Brownian excursions, which possess for fluctuations Kardar-Parisi-Zhang scaling with the critical exponent $ν=\frac{1}{3}$. In all models imposed external constraints push the underlying stochastic process to a large deviation regime. Specifically, we have considered fluctuations for: (i) Brownian excursions on non-uniform finite trees with linearly growing branching originating from the mean-field approximation of the Dumitriu-Edelman representation of matrix models, (ii) (1+1)D "magnetic" Dyck paths within the strip of finite width, (iii) inflated ideal polymer ring with fixed gyration radius. In the latter problem cutting off the long-ranged spatial fluctuations and leaving only the "typical" modes for stretched paths, we ensure the KPZ-like scaling for bond fluctuations. To the contrary, summing up all normal modes, we get the Gaussian behavior. In all considered models, KPZ fluctuations emerge in presence of two complementary conditions: (i) the trajectories are pushed to a large deviation region of a phase space, and (ii) the trajectories are leaning on an impenetrable boundary.

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