Nonuniversal exponents in sandpiles with stochastic particle number transferK. Jain
Institut für Theoretische Physik, Universität zu Köln Zülpicher Strasse 77, 50937 Köln, Germany
received 14 March 2005; accepted in final form 3 May 2005
published online 27 May 2005
We study fixed density sandpiles in which the number of particles transferred to a neighbor on relaxing an active site is determined stochastically by a parameter p. Using an argument, the critical density at which an active-absorbing transition occurs is found exactly. We study the critical behavior numerically and find that the exponents associated with both static and time-dependent quantities vary continuously with p.
02.50.-r - Probability theory, stochastic processes, and statistics.
64.60.-i - General studies of phase transitions.
05.65.+b - Self-organized systems.
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