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We study a simple sandpile model of active-absorbing state transitions inwhich a particle can hop out of a site only if the number of particles at thatsite is above a certain threshold. We show that the active phase has productmeasure whereas nontrivial correlations are found numerically in the absorbingphase. It is argued that the system relaxes to the latter phase slower thanexponentially. The critical behavior of this model is found to be differentfrom that of the other known universality classes.Comment: Revised version. To appear in Phys. Rev.

Simple sandpile model of active-absorbing state transitions