Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2005-12-07
Physica A 377 (2007) 329-339
Physics
Condensed Matter
Statistical Mechanics
16 pages, 4 figures, accepted for publication in Physica A
Scientific paper
10.1016/j.physa.2006.11.006
We propose a general geometric growth model for pseudofractal scale-free web, which is controlled by two tunable parameters. We derive exactly the main characteristics of the networks: degree distribution, second moment of degree distribution, degree correlations, distribution of clustering coefficient, as well as the diameter, which are partially determined by the parameters. Analytical results show that the resulting networks are disassortative and follow power-law degree distributions, with a more general degree exponent tuned from 2 to $1+\frac{\ln3}{\ln2}$; the clustering coefficient of each individual node is inversely proportional to its degree and the average clustering coefficient of all nodes approaches to a large nonzero value in the infinite network order; the diameter grows logarithmically with the number of network nodes. All these reveal that the networks described by our model have small-world effect and scale-free topology.
Rong Lili
Zhang Zhongzhi
Zhou Shuigeng
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