Dimension of branching processes and self-organized criticality

Abstract
Branching processes and their application as a model of self-organized criticality are briefly reviewed. The critical dimension for this model is calculated. The differences between our result and similar ones on polymers and percolation are explained. We discuss semiquantitatively why the critical dimension of a model of self-organized criticality that includes the oscillation of the sandpile around its critical value would be different, perhaps even infinite. Finally, we conjecture that our mathematical results are more general than they seem.

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