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Percolation for level-sets of Gaussian free fields on metric graphs. (English) Zbl 1505.60087

Summary: We study level-set percolation for Gaussian free fields on metric graphs. In two dimensions, we give an upper bound on the chemical distance between the two boundaries of a macroscopic annulus. Our bound holds with high probability conditioned on connectivity and is sharp up to a poly-logarithmic factor with an exponent of one-quarter. This substantially improves a previous result by Li and the first author. In three dimensions and higher, we provide rather precise estimates of percolation probabilities in different regimes which altogether describe a sharp phase transition.

MSC:

60K35 Interacting random processes; statistical mechanics type models; percolation theory
60G60 Random fields
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References:

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