All scale-free networks are sparse

Charo del Genio, Thilo Gross, Kevin Bassler

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Abstract

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.
Original languageEnglish
Article number178701
JournalPhysical Review Letters
Volume107
DOIs
Publication statusPublished - 17 Oct 2011

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