Mixing time of critical ising model on trees is polynomial in the height

Jian Ding, Eyal Lubetzky, Yuval Peres

Research output: Contribution to journalArticle


In the heat-bath Glauber dynamics for the Ising model on the lattice, physicists believe that the spectral gap of the continuous-time chain exhibits the following behavior. For some critical inverse-temperature β c, the inverse-gap is O(1) for β < β c, polynomial in the surface area for β = β c and exponential in it for β > β c. This has been proved for ℤ 2 except at criticality. So far, the only underlying geometry where the critical behavior has been confirmed is the complete graph. Recently, the dynamics for the Ising model on a regular tree, also known as the Bethe lattice, has been intensively studied. The facts that the inverse-gap is bounded for β < β c and exponential for β > β c were established, where β c is the critical spin-glass parameter, and the tree-height h plays the role of the surface area. In this work, we complete the picture for the inverse-gap of the Ising model on the b-ary tree, by showing that it is indeed polynomial in h at criticality. The degree of our polynomial bound does not depend on b, and furthermore, this result holds under any boundary condition. We also obtain analogous bounds for the mixing-time of the chain. In addition, we study the near critical behavior, and show that for β > β c, the inverse-gap and mixing-time are both exp[Θ((β - β c)h)].

Original languageEnglish (US)
Pages (from-to)161-207
Number of pages47
JournalCommunications in Mathematical Physics
Issue number1
Publication statusPublished - Feb 2010


ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Mathematical Physics

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