arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1302.6487cond-mat.dis-nncond-mat.stat-mechphysics.comp-ph
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无序等级晶格上最小能量路径的典型性质和大偏差性质

Typical and large-deviation properties of minimum-energy paths on disordered hierarchical lattices

O. Melchert, A. K. Hartmann

摘要:

我们进行了数值模拟研究的最优路径问题的无序层次图的有效维数d=2.32。其中,从允许正能量和负能量的无序分布中提取边缘能量。这导致了一种行为,这种行为与所有能量都是正的情况根本不同。在改变分布的细微之处时,最小能量路径长度的缩放表现出从自仿射到自相似的过渡。我们分析了精确的缩放的路径长度和相关的基态能量波动的附近的无序临界点,使用抽取程序巨大的图形。此外,使用一个重要的抽样程序中的混乱,我们计算的负能量尾巴的基态能量分布高达12个标准偏差远离其平均值。我们发现负能尾的渐近行为符合Tracy-Widom分布。此外,尾部的特征标度可以与基态能量波动有关,类似于随机介质中的定向聚合物。

英文摘要:

We perform numerical simulations to study the optimal path problem on disordered hierarchical graphs with effective dimension d=2.32. Therein, edge energies are drawn from a disorder distribution that allows for positive and negative energies. This induces a behavior which is fundamentally different from the case where all energies are positive, only. Upon changing the subtleties of the distribution, the scaling of the minimum energy path length exhibits a transition from self-affine to self-similar. We analyze the precise scaling of the path length and the associated ground-state energy fluctuations in the vincinity of the disorder critical point, using a decimation procedure for huge graphs. Further, using an importance sampling procedure in the disorder we compute the negative-energy tails of the ground-state energy distribution up to 12 standard deviations away from its mean. We find that the asymptotic behavior of the negative-energy tail is in agreement with a Tracy-Widom distribution. Further, the characteristic scaling of the tail can be related to the ground-state energy flucutations, similar as for the directed polymer in a random medium.

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