Crossover phenomenon in self-organized critical sandpile models
We consider a stochastic sandpile where the sand grains of unstable sites are randomly distributed to the nearest neighbors. Increasing the value of the threshold condition the stochastic character of the distribution is lost and a crossover to the scaling behavior of a different sandpile model takes place where the sand grains are equally transferred to the nearest neighbors. The crossover behavior is analyzed numerically in detail; especially we consider the exponents which determine the scaling behavior.
Lubeck
S
Theoretische Tieftemperaturphysik, Gerhard-Mercator-Universitat Duisburg, Lotharstrasse 1, 47048 Duisburg, Germany.