Critical fluctuations in the Bak-Sneppen model

The critical fluctuation properties of fitness distribution in one-dimensional Bak-Sneppen model are studied in terms of the normalized factorial moments and erraticity moments. For a fitness window above the critical gap, no anomaly scaling of the moments is found, while for a window below the gap intermittent behaviors are observed. The scaling exponent for the BS model is different from that in two dimensional Ising model for second order phase transition.