Universal Scaling of Optimal Current Distribution in Transportation Networks

Details Universal Scaling of Optimal Current Distribution in Transportation Networks Universal Scaling of Optimal Current Distribution in Transportation Networks

2009-05-03

arxiv.org/abs/0905.0296v1

PHYSICAL REVIEW E 79, 046110 (2009)

Physics

Condensed Matter

Statistical Mechanics

5 pages, 5 figures

Scientific paper

Transportation networks are inevitably selected with reference to their global cost which depends on the strengths and the distribution of the embedded currents. We prove that optimal current distributions for a uniformly injected d-dimensional network exhibit robust scale-invariance properties, independently of the particular cost function considered, as long as it is convex. We find that, in the limit of large currents, the distribution decays as a power law with an exponent equal to (2d-1)/(d-1). The current distribution can be exactly calculated in d=2 for all values of the current. Numerical simulations further suggest that the scaling properties remain unchanged for both random injections and by randomizing the convex cost functions.

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