Annals of Probability

Exact asymptotics for Duarte and supercritical rooted kinetically constrained models

Laure Marêché, Fabio Martinelli, and Cristina Toninelli

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Abstract

Kinetically constrained models (KCM) are a class of interacting particle systems which represent a natural stochastic (and nonmonotone) counterpart of the family of cellular automata known as $\mathcal{U}$-bootstrap percolation. A key issue for KCM is to identify the divergence of the characteristic time scales when the equilibrium density of empty sites, $q$, goes to zero. In (Ann. Probab. 47 (2019) 324–361; Comm. Math. Phys. 369 (2019) 761–809), a general scheme was devised to determine a sharp upper bound for these time scales. Our paper is devoted to developing a (very different) technique which allows to prove matching lower bounds. We analyse the class of two-dimensional supercritical rooted KCM and the Duarte KCM. We prove that the relaxation time and the mean infection time diverge for supercritical rooted KCM as $e^{\Theta ((\log q)^{2})}$ and for Duarte KCM as $e^{\Theta ((\log q)^{4}/q^{2})}$ when $q\downarrow 0$. These results prove the conjectures put forward in (European J. Combin. 66 (2017) 250–263; Comm. Math. Phys. 369 (2019) 761–809) for these models, and establish that the time scales for these KCM diverge much faster than for the corresponding $\mathcal{U}$-bootstrap processes, the main reason being the occurrence of energy barriers which determine the dominant behaviour for KCM, but which do not matter for the bootstrap dynamics.

Article information

Source
Ann. Probab., Volume 48, Number 1 (2020), 317-342.

Dates
Received: July 2018
First available in Project Euclid: 25 March 2020

Permanent link to this document
https://projecteuclid.org/euclid.aop/1585123330

Digital Object Identifier
doi:10.1214/19-AOP1362

Mathematical Reviews number (MathSciNet)
MR4079438

Zentralblatt MATH identifier
07206760

Subjects
Primary: 60K35: Interacting random processes; statistical mechanics type models; percolation theory [See also 82B43, 82C43]
Secondary: 60J27: Continuous-time Markov processes on discrete state spaces

Keywords
Glauber dynamics kinetically constrained models spectral gap bootstrap percolation Duarte model

Citation

Marêché, Laure; Martinelli, Fabio; Toninelli, Cristina. Exact asymptotics for Duarte and supercritical rooted kinetically constrained models. Ann. Probab. 48 (2020), no. 1, 317--342. doi:10.1214/19-AOP1362. https://projecteuclid.org/euclid.aop/1585123330


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