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arXiv 1402.4450cond-mat.dis-nnmath-phmath.MPphysics.soc-ph
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爆炸逾渗转变的临界指数

Critical exponents of the explosive percolation transition

R. A. da Costa, S. N. Dorogovtsev, A. V. Goltsev, J. F. F. Mendes

摘要:

在一组非平衡模型中观察到的一种新型的渗流相变中,顶点之间的每个新连接都是通过Achlioptas算法从许多可能性中选择的。这会导致小组分的优先合并,并延迟渗滤簇的出现。第一次模拟得出的结论是,在这个不可逆的过程中的渗流集群出生不连续的,由一个不连续的相变,这导致在术语“爆炸渗流过渡”。我们已经表明,这种过渡实际上是连续的(二阶),虽然与一个令人不安的小临界指数的渗流集团。在这里,我们提出了一个有效的数值方法,使我们能够找到临界指数和其他特性的二阶过渡的一组具有代表性的爆炸渗流模型与不同数量的选择。该方法是基于粘合在一起的集群大小分布和幂律渐近演化方程的数值解。对于每一个模型,我们都得到了临界指数和临界点,并且精度很高。

英文摘要:

In a new type of percolation phase transition, which was observed in a set of non-equilibrium models, each new connection between vertices is chosen from a number of possibilities by an Achlioptas-like algorithm. This causes preferential merging of small components and delays the emergence of the percolation cluster. First simulations led to a conclusion that a percolation cluster in this irreversible process is born discontinuously, by a discontinuous phase transition, which results in the term "explosive percolation transition". We have shown that this transition is actually continuous (second-order) though with an anomalously small critical exponent of the percolation cluster. Here we propose an efficient numerical method enabling us to find the critical exponents and other characteristics of this second order transition for a representative set of explosive percolation models with different number of choices. The method is based on gluing together the numerical solutions of evolution equations for the cluster size distribution and power-law asymptotics. For each of the models, with high precision, we obtain critical exponents and the critical point.

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