Scaling behavior of the Abelian sandpile model

The Abelian sandpile model in two dimensions does not show the type of critical behavior familiar from equilibrium systems. Rather, the properties of the stationary state follow from the condition that an avalanche started at a distance r from the system boundary has a probability proportional to 1/root r to reach the boundary. As a consequence, the scaling behavior of the model can be obtained from evaluating dissipative avalanches alone, allowing one not only to determine the values of all exponents, but showing also the breakdown of finite-size scaling.