Generating-function approach for bond percolations in hierarchical networks

Abstract

We study bond percolations on hierarchical scale-free networks with the open bond probability of the shortcuts $\tilde{p}$ and that of the ordinary bonds $p$. The system has a critical phase in which the percolating probability $P$ takes an intermediate value $0<P<1$. Using generating function approach, we calculate the fractal exponent $\psi$ of the root clusters to show that $\psi$ varies continuously with $\tilde{p}$ in the critical phase. We confirm numerically that the distribution $n_s$ of cluster size $s$ in the critical phase obeys a power law $n_s\propto s^{-\tau }$, where $\tau$ satisfies the scaling relation $\tau =1+{\psi }^{-1}$. In addition the critical exponent $\beta (\tilde{p})$ of the order parameter varies as $\tilde{p}$, from $\beta \simeq 0.164694$ at $\tilde{p}=0$ to infinity at $\tilde{p}={\tilde{p}}_c=5/32$.

8 pages, 8 figures

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