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Sharp freezing time estimates for the subcritical Facilit...
Oriane Blondel, Clément Erignoux, Seonwoo Kim, Sanha Lee · 2026-06-13 · via math updates on arXiv.org

We investigate the exact transience time of the Facilitated Exclusion Process (FEP) on the one-dimensional torus with $N$ sites. The FEP exhibits an active/inactive phase transition at critical density $1/2$, such that in the subcritical density regime $(0,1/2)$, it becomes frozen after a finite time period -- the transience time or freezing time. We first show that for the FEP starting from a Bernoulli product measure of marginal density $ρ\in (0,1/2)$, the transience time has exactly the scale of $Θ(\log^3 N)$. Secondly, we prove that in the near-critical case $ρ\simeq 1/2 - N^{-α}$ for $α\in (0,1)$, the transience time is polynomial and has a scale of $N^{1 \wedge (2α)}$. The key idea is to estimate the typical size of locally supercritical intervals of the initial distribution, which has order $\log N$ in the subcritical case and $N^{1 \wedge (2α)}$ in the near-critical case. In the subcritical case this is enough, whereas in the near-critical case we need additional dynamical decorrelation inequalities to apply this static result to estimate the freezing time.