All scale-free networks are sparse

Details All scale-free networks are sparse All scale-free networks are sparse

2011-06-25

arxiv.org/abs/1106.5150v2

Phys. Rev. Lett. 107, 178701 (2011)

Physics

Physics and Society

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.107.178701

We study the realizability of scale free-networks with a given degree sequence, showing that the fraction of realizable sequences undergoes two first-order transitions at the values 0 and 2 of the power-law exponent. We substantiate this finding by analytical reasoning and by a numerical method, proposed here, based on extreme value arguments, which can be applied to any given degree distribution. Our results reveal a fundamental reason why large scale-free networks without constraints on minimum and maximum degree must be sparse.

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