Possible Connection between the Optimal Path and Flow in Percolation Clusters (original) (raw)

We study the behavior of the optimal path between two sites separated by a distance r on a d-dimensional lattice of linear size L with weight assigned to each site. We focus on the strong disorder limit, i.e., when the weight of a single site dominates the sum of the weights along each path. We calculate the probability distribution P͑ᐉ opt ͉ r , L͒ of the optimal path length ᐉ opt , and find for r Ӷ L a power-law decay with ᐉ opt , characterized by exponent g opt . We determine the scaling form of P͑ᐉ opt ͉ r , L͒ in two-and three-dimensional lattices. To test the conjecture that the optimal paths in strong disorder and flow in percolation clusters belong to the same universality class, we study the tracer path length ᐉ tr of tracers inside percolation through their probability distribution P͑ᐉ tr ͉ r , L͒. We find that, because the optimal path is not constrained to belong to a percolation cluster, the two problems are different. However, by constraining the optimal paths to remain inside the percolation clusters in analogy to tracers in percolation, the two problems exhibit similar scaling properties.