### Metadata

### Abstract

The broad motivation of this work is a rigorous understanding of reversible, local Markov dynamics of interfaces, and in particular their speed of convergence to equilibrium, measured via the mixing time ${T}_{mix}$. In the $(d+1)$-dimensional setting, $d\ge 2$, this is to a large extent mathematically unexplored territory, especially for discrete interfaces. On the other hand, on the basis of a mean-curvature motion heuristics [Hen97, Spo93] and simulations (see [Des02] and the references in [Hen97, Wil04]), one expects convergence to equilibrium to occur on time-scales of order $\approx {\delta}^{-2}$ in any dimension, with $\delta \to 0$ the lattice mesh.

We study the single-flip Glauber dynamics for lozenge tilings of a finite domain of the plane, viewed as $(2+1)$-dimensional surfaces. The stationary measure is the uniform measure on admissible tilings. At equilibrium, by the limit shape theorem [CKP01], the height function concentrates as $\delta \to 0$ around a deterministic profile $\varphi $, the unique minimizer of a surface tension functional. Despite some partial mathematical results [LT15a, LT15b, Wil04], the conjecture ${T}_{mix}={\delta}^{-2+o\left(1\right)}$ had been proven, so far, only in the situation where $\varphi $ is an affine function [CMT12]. In this work, we prove the conjecture under the sole assumption that the limit shape $\varphi $ contains no frozen regions (facets).

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