Artikel,

Analytical results for the distribution of shortest path lengths in random networks

, , , , , , und .
EPL (Europhysics Letters), 111 (2): 26006+ (01.07.2015)
DOI: 10.1209/0295-5075/111/26006

Zusammenfassung

We present two complementary analytical approaches for calculating the distribution of shortest path lengths in Erdos-Rényi networks, based on recursion equations for the shells around a reference node and for the paths originating from it. The results are in agreement with numerical simulations for a broad range of network sizes and connectivities. The average and standard deviation of the distribution are also obtained. In the case that the mean degree scales as \$N^\alpha\$ with the network size, the distribution becomes extremely narrow in the asymptotic limit, namely almost all pairs of nodes are equidistant, at distance \$d=1/\rfloor\$ from each other. The distribution of shortest path lengths between nodes of degree \$m\$ and the rest of the network is calculated. Its average is shown to be a monotonically decreasing function of \$m\$, providing an interesting relation between a local property and a global property of the network. The methodology presented here can be applied to more general classes of networks.

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