Physics – Physics and Society
Scientific paper
2009-11-18
Physical Review E 81, 036110 (2010)
Physics
Physics and Society
11 pages, 13 figures, 1 table
Scientific paper
10.1103/PhysRevE.81.036110
Percolation is one of the most studied processes in statistical physics. A recent paper by Achlioptas et al. [Science 323, 1453 (2009)] has shown that the percolation transition, which is usually continuous, becomes discontinuous ("explosive") if links are added to the system according to special cooperative rules (Achlioptas processes). In this paper we present a detailed numerical analysis of Achlioptas processes with product rule on various systems, including lattices, random networks a' la Erdoes-Renyi and scale-free networks. In all cases we recover the explosive transition by Achlioptas et al.. However, the explosive percolation transition is kind of hybrid as, despite the discontinuity of the order parameter at the threshold, one observes traces of analytical behavior, like power law distributions of cluster sizes. In particular, for scale-free networks with degree exponent lambda<3, all relevant percolation variables display power law scaling, just as in continuous second-order phase transitions.
Fortunato Santo
Radicchi Filippo
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