The evolution of the mixing rate of a simple random walk on the giant component of a random graph

  • Authors:
  • N. Fountoulakis;B. A. Reed

  • Affiliations:
  • School of Mathematics, University of Birmingham, United Kingdom;Canada Research Chair in Graph Theory, School of Computer Science, McGill University, Canada and Laboratoire I3S, CNRS, Project Mascotte, INRIA, Sophia-Antipolis, France

  • Venue:
  • Random Structures & Algorithms
  • Year:
  • 2008

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Abstract

In this article we present a study of the mixing time of a random walk on the largest component of a supercritical random graph, also known as the giant component. We identify local obstructions that slow down the random walk, when the average degree d is at most O($ \sqrt{\ln n} $), proving that the mixing time in this case is Θ((n-d)2) asymptotically almost surely. As the average degree grows these become negligible and it is the diameter of the largest component that takes over, yielding mixing time Θ(n-d) a.a.s.. We proved these results during the 2003–04 academic year. Similar results but for constant d were later proved independently by Benjamini et al. in [3]. © 2008 Wiley Periodicals, Inc. Random Struct. Alg., 2008 Most of this work was completed while the author was a research fellow at the School of Computer Science, McGill University.