Abstract
We study a random neighbor version of the Bak-Sneppen model, where "nearest neighbors" are chosen according to a probability distribution decaying as a power law of the distance from the active site, P(x) approximately x-x(ac)(-omega). All of the exponents characterizing the self-organized critical state of this model depend on the exponent omega. As omega-->1 we recover the usual random nearest-neighbor version of the model. The pattern of results obtained for a range of values of omega is also compatible with the results of simulations of the original BS model in high dimensions. Moreover, our results suggest a critical dimension dc=6 for the Bak-Sneppen model, in contrast with previous claims.
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