Event Type:

Probability Seminar

Date/Time:

Tuesday, April 24, 2012 - 09:00

Location:

Kidder 364

Local Speaker:

Abstract:

e investigate the relationship between the mixing times of the Glauber dynamics of a statistical mechanical system with its thermodynamic equilibrium structure. For this we consider the mean-field Blume-Capel model (a.k.a. Blume-Emery-Griffiths model), one of the simplest statistical mechanical models that exhibits the following intricate phase transition structure: within a two dimensional parameter space there exists a curve at which the model undergoes a second-order, continuous phase transition, a curve where the model undergoes a first-order, discontinuous phase transition, and a tricritical point which separates the two curves. We determine the interface between the regions of slow and rapid mixing. In order to completely determine the region of rapid mixing, we employ a novel extension of the path coupling method, successfully proving rapid mixing even in the absence of contraction between neighboring states.

Next, I will briefly explain generalizing the method to a class of statistical mechanical models satisfying large deviation principle, such as the mean-field Potts model. Based on the joint work with Peter Otto of Willamette University.