Article,

Universal Behavior of Load Distribution in Scale-Free Networks

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Physical Review Letters, 87 (27): 278701+ (Dec 12, 2001)
DOI: 10.1103/physrevlett.87.278701

Abstract

We study a problem of data packet transport in scale-free networks whose degree distribution follows a power law with the exponent γ. Load, or ” betweenness centrality,” of a vertex is the accumulated total number of data packets passing through that vertex when every pair of vertices sends and receives a data packet along the shortest path connecting the pair. It is found that the load distribution follows a power law with the exponent δ≈2.2(1), insensitive to different values of γ in the range, 2<γ≤3, and different mean degrees, which is valid for both undirected and directed cases. Thus, we conjecture that the load exponent is a universal quantity to characterize scale-free networks.

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