Comment on: 'Universal Behavior of Load Distribution in Scale-free Networks'

Abstract

In a previous Letter (cond-mat/0106565), Goh et al have presented a numerical study of the load--or betweenness centrality--distribution in a scale-free network whose degree distribution follows a power law with a tunable exponent $γ$. They showed that the load $\ell$ is distributed according to a power-law with exponent $δ$. The authors claimed that $δ$ is universal, ie. independent of the exponent $γ$. In this comment, we use two different ways of checking numerically this universality and we show that it does not hold.