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Kinetically constrained models : relaxation to equilibrium and universality results

Abstract : This thesis studies the class of interacting particle systems called kinetically constrained models (KCMs). It considers first the question of universality: can the infinity of possible models be sorted into a finite number of classes according to their properties? Such a result was recently proven in a related class of models, bootstrap percolation, where models can be divided into supercritical, critical and subcritical. This classification can also be applied to KCMs, but it is not precise enough: supercritical KCMs have to be divided into rooted and unrooted, and critical KCMs depending on them having or not an infinity of stable directions. This thesis shows the relevance of this classification of KCMs and completes the proof of their universality in the supercritical and critical cases, by proving a lower bound for two characteristic scales, the relaxation time and the first time at which a site is at 0, in the supercritical rooted case (work with F. Martinelli and C. Toninelli, relying on a combinatorial result shown without collaboration) and in the case of critical models with an infinity of stable directions (work with I. Hartarsky and C. Toninelli). It also establishes a more precise lower bound in the particular case of the Duarte model (work with F. Martinelli and C. Toninelli). Secondly, this thesis shows results of exponential convergence to equilibrium, for all supercritical KCMs under certain conditions and in the particular case of the d-dimensional East model without restrictions.
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Laure Marêché. Kinetically constrained models : relaxation to equilibrium and universality results. Probability [math.PR]. Université Paris Cité, 2019. English. ⟨NNT : 2019UNIP7125⟩. ⟨tel-03097986⟩



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