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Slow decay of Gibbs measures with heavy tails

Probability Theory and Related Fields, ISSN: 0178-8051, Vol: 148, Issue: 1, Page: 247-268
2010
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We consider Glauber dynamics reversible with respect to Gibbs measures with heavy tails in the case when spins are unbounded. The interactions are bounded and of finite range. The self-potential enters into two classes of measures, κ-concave probability measures and sub-exponential laws, for which it is known that no exponential decay can occur. Using coercive inequalities we prove that, for κ-concave probability measures, the associated infinite volume semi-group decays to equilibrium polynomially and stretched exponentially for sub-exponential laws. This improves and extends previous results by Bobkov and Zegarlinski. © 2009 Springer-Verlag.

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