On intermediate level sets of two-dimensional discrete Gaussian Free Field

Abstract

We consider the discrete Gaussian Free Field (DGFF) in scaled-up (square-lattice) versions of suitably regular continuum domains $D\subset \mathbb{C}$ and describe the scaling limit, including local structure, of the level sets at heights growing as a $\lambda$-multiple of the height of the absolute maximum, for any $\lambda \in (0,1)$. We prove that, in the scaling limit, the scaled spatial position of a typical point $x$ sampled from this level set is distributed according to a Liouville Quantum Gravity (LQG) measure in $D$ at parameter equal $\lambda$-times its critical value, the field value at $x$ has an exponential intensity measure and the configuration near $x$ reduced by the value at $x$ has the law of a pinned DGFF reduced by a suitable multiple of the potential kernel. In particular, the law of the total size of the level set, properly-normalized, converges that that of the total mass of the LQG measure. This sharpens considerably an earlier conclusion by Daviaud.

41 pages, 3 figs

References in corpus (3)

• Extremes of the discrete two-dimensional Gaussian free field
• Full extremal process, cluster law and freezing for the two-dimensional discrete Gaussian Free Field
• Critical Liouville measure as a limit of subcritical measures

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