Abstract
Kinetically constrained models (KCM) are reversible interacting particle systems on \({{\mathbb {Z}}} ^d\) with continuous-time constrained Glauber dynamics. They are a natural non-monotone stochastic version of the family of cellular automata with random initial state known as \({{\mathscr {U}}}\)-bootstrap percolation. KCM have an interest in their own right, owing to their use for modelling the liquid-glass transition in condensed matter physics. In two dimensions there are three classes of models with qualitatively different scaling of the infection time of the origin as the density of infected sites vanishes. Here we study in full generality the class termed ‘critical’. Together with the companion paper by Hartarsky et al. (Universality for critical KCM: finite number of stable directions. arXiv e-prints arXiv:1910.06782, 2019) we establish the universality classes of critical KCM and determine within each class the critical exponent of the infection time as well as of the spectral gap. In this work we prove that for critical models with an infinite number of stable directions this exponent is twice the one of their bootstrap percolation counterpart. This is due to the occurrence of ‘energy barriers’, which determine the dominant behaviour for these KCM but which do not matter for the monotone bootstrap dynamics. Our result confirms the conjecture of Martinelli et al. (Commun Math Phys 369(2):761–809. https://doi.org/10.1007/s00220-018-3280-z, 2019), who proved a matching upper bound.
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Notes
For the lower bound of \(T_{\mathrm {rel}}\) one does not need to use the boostrap percolation results, as \(T_{\mathrm {rel}}\geqslant q^{-\min _{U\in {{\mathscr {U}}}}|U|}/|{{\mathscr {U}}}|\) by plugging the test function \({\mathbb {1}} _{\{\omega _0=0\}}\) in Definition 2.5.
Note that, since the Duarte update rules contain only the North, South and West neighbours of the origin, the constraint at a site x does not depend on the sites with abscissa larger than the abscissa of x.
Actually these references focus on the study of \(T_{\mathrm {rel}}\). A matching upper bound for \({{\mathbb {E}}} (\tau _0)\) follows from (10). The lower bound for \({{\mathbb {E}}} (\tau _0)\) follows easily from the lower bound for \({{\mathbb {P}}} (\tau _0>t)\) with \(t=\exp {(\log (q)^2/2\log 2)}\) obtained in the proof of Theorem 5.1 of [11].
The conjecture involuntarily asks for a positive power of \(\log q\), which we do not expect to be systematically present (see Conjecture 7.1).
Associativity was referred to as commutativity by previous authors [8].
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Acknowledgements
We wish to thank Fabio Martinelli for numerous and enlightening discussions and the Departement of Mathematics and Physics of University Roma Tre for its kind hospitality.
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This work was supported by European Research Council Starting Grant 680275 MALIG and by Agence Nationale de la Recherche-15-CE40-0020-01.
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Hartarsky, I., Marêché, L. & Toninelli, C. Universality for critical KCM: infinite number of stable directions. Probab. Theory Relat. Fields 178, 289–326 (2020). https://doi.org/10.1007/s00440-020-00976-9
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DOI: https://doi.org/10.1007/s00440-020-00976-9