Non-searchability of random power-law graphs

  • Authors:
  • Philippe Duchon;Nicole Eggemann;Nicolas Hanusse

  • Affiliations:
  • LaBRI, CNRS, Univ. Bordeaux, Talence;Dept. of Mathematics, Brunel University, UK;LaBRI, CNRS, Univ. Bordeaux, Talence

  • Venue:
  • OPODIS'07 Proceedings of the 11th international conference on Principles of distributed systems
  • Year:
  • 2007

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Abstract

We investigate the complexity of searching for a given vertex in a scale-free graph, using only locally gathered information. In such graphs, the number of nodes of degree x is proportional to x-β for some constant β 0. We consider two random scale-free graph models: the Chung-Lu model and the Móri model (a generalization of the Barabási-Albert model) proving two lower bounds of Ω(n/ logΘ(β) n) and Ω(n1/2) on the expected time to find the worst-case target, under a restrictive model of local information.