Variable length path coupling

  • Authors:
  • Thomas P. Hayes;Eric Vigoda

  • Affiliations:
  • Department of Computer Science, The University of Chicago, Chicago, IL 60637;(College of Computing, Georgia Institute of Technology, Atlanta, GA 30332) Department of Computer Science, The University of Chicago, Chicago, IL 60637 and Isaac Newton Institute for Mathematical ...

  • Venue:
  • Random Structures & Algorithms
  • Year:
  • 2007

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Abstract

We present a new technique for constructing and analyzing couplings to bound the convergence rate of finite Markov chains. Our main theorem is a generalization of the path coupling theorem of Bubley and Dyer, allowing the defining partial couplings to have length determined by a random stopping time. Unlike the original path coupling theorem, our version can produce multistep (non-Markovian) couplings. Using our variable length path coupling theorem, we improve the upper bound on the mixing time of the Glauber dynamics for randomly sampling colorings. © 2007 Wiley Periodicals, Inc. Random Struct. Alg., 2007 A preliminary version of this paper appeared in Proceedings of the Fifteenth Annual ACM-SIAM Symposium on Discrete Algorithms, 2004, pp. 103–110.