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2008 Glauber dynamics on nonamenable graphs: boundary conditions and mixing time
Alessandra Bianchi
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Electron. J. Probab. 13: 1980-2012 (2008). DOI: 10.1214/EJP.v13-574


We study the stochastic Ising model on finite graphs with n vertices and bounded degree and analyze the effect of boundary conditions on the mixing time. We show that for all low enough temperatures, the spectral gap of the dynamics with (+)-boundary condition on a class of nonamenable graphs, is strictly positive uniformly in n. This implies that the mixing time grows at most linearly in n. The class of graphs we consider includes hyperbolic graphs with sufficiently high degree, where the best upper bound on the mixing time of the free boundary dynamics is polynomial in n, with exponent growing with the inverse temperature. In addition, we construct a graph in this class, for which the mixing time in the free boundary case is exponentially large in n. This provides a first example where the mixing time jumps from exponential to linear in n while passing from free to (+)-boundary condition. These results extend the analysis of Martinelli, Sinclair and Weitz to a wider class of nonamenable graphs.


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Alessandra Bianchi. "Glauber dynamics on nonamenable graphs: boundary conditions and mixing time." Electron. J. Probab. 13 1980 - 2012, 2008.


Accepted: 11 November 2008; Published: 2008
First available in Project Euclid: 1 June 2016

zbMATH: 1187.82073
MathSciNet: MR2453553
Digital Object Identifier: 10.1214/EJP.v13-574

Primary: 82C20
Secondary: 60K35 , 82B20 , 82C80

Keywords: Glauber dynamics , mixing time , nonamenable graphs , spectral gap

Vol.13 • 2008
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