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arXiv 0812.2230cond-mat.dis-nncond-mat.stat-mech
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稀释负权重渗流模型中的相变

Phase transitions in diluted negative-weight percolation models

L. Apolo, O. Melchert, A. K. Hartmann

摘要:

我们调查的几何性质的循环的二维格图,边的权重是从一个分布,允许正负权重。我们感兴趣的是总权为负的生成环的出现。由此产生的渗流问题是从根本上不同于传统的渗流,因为我们已经看到,在以前的研究这个模型的未稀释的情况下。在这里,我们研究如何渗透过渡的影响,额外的稀释。我们考虑两种类型的稀释:无论是一定比例的边缘表现出零权重,或一小部分的边缘甚至是不存在的。我们研究这些系统的数值使用精确的组合优化技术的基础上适当的变换的图形和应用匹配算法。我们进行了有限尺寸标度分析,以获得相图,并确定相边界的关键属性。我们发现,第一种类型的稀释不改变的普适性类相比,未稀释的情况下,而第二种类型的稀释导致的普适性类的变化。

英文摘要:

We investigate the geometric properties of loops on two-dimensional lattice graphs, where edge weights are drawn from a distribution that allows for positive and negative weights. We are interested in the appearance of spanning loops of total negative weight. The resulting percolation problem is fundamentally different from conventional percolation, as we have seen in a previous study of this model for the undiluted case. Here, we investigate how the percolation transition is affected by additional dilution. We consider two types of dilution: either a certain fraction of edges exhibit zero weight, or a fraction of edges is even absent. We study these systems numerically using exact combinatorial optimization techniques based on suitable transformations of the graphs and applying matching algorithms. We perform a finite-size scaling analysis to obtain the phase diagram and determine the critical properties of the phase boundary. We find that the first type of dilution does not change the universality class compared to the undiluted case whereas the second type of dilution leads to a change of the universality class.

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