title: Universality and self-similarity of an energy-constrained sandpile model with random neighbors.
abstract: We study an energy-constrained sandpile model with random neighbors. The critical behavior of the model is in the same universality class as the mean-field self-organized criticality sandpile. The critical energy E(c) depends on the number of neighbors n for each site, but the various exponents are independent of n. A self-similar structure with n-1 major peaks is developed for the energy distribution p(E) when the system approaches its stationary state. The avalanche dynamics contributes to the major peaks appearing at E(p(k))=2k/(2n-1) with k=1,2,...,n-1, while the fine self-similar structure is a natural result of the way the system is disturbed.
authors.affiliation: Institute of Low Energy Nuclear Physics, Beijing Normal University, Beijing 100875, China. zhangsd@bnu.edu.cn
authors.forename: S D
authors.initials: SD
authors.lastname: Zhang