Electronic Journal of Probability

Disconnection by level sets of the discrete Gaussian free field and entropic repulsion

Maximilian Nitzschner

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We derive asymptotic upper and lower bounds on the large deviation probability that the level set of the Gaussian free field on $\mathbb{Z} ^d$, $d \geq 3$, below a level $\alpha $ disconnects the discrete blow-up of a compact set $A$ from the boundary of the discrete blow-up of a box that contains $A$, when the level set of the Gaussian free field above $\alpha $ is in a strongly percolative regime. These bounds substantially strengthen the results of [21], where $A$ was a box and the convexity of $A$ played an important role in the proof. We also derive an asymptotic upper bound on the probability that the average of the Gaussian free field well inside the discrete blow-up of $A$ is above a certain level when disconnection occurs. The derivation of the upper bounds uses the solidification estimates for porous interfaces that were derived in the work [15] of A.-S. Sznitman and the author to treat a similar disconnection problem for the vacant set of random interlacements. If certain critical levels for the Gaussian free field coincide, an open question at the moment, the asymptotic upper and lower bounds that we obtain for the disconnection probability match in principal order, and conditioning on disconnection lowers the average of the Gaussian free field well inside the discrete blow-up of $A$, which can be understood as entropic repulsion.

Article information

Electron. J. Probab., Volume 23 (2018), paper no. 105, 21 pp.

Received: 19 February 2018
Accepted: 14 September 2018
First available in Project Euclid: 23 October 2018

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Zentralblatt MATH identifier

Primary: 60F10: Large deviations 60G15: Gaussian processes 60K35: Interacting random processes; statistical mechanics type models; percolation theory [See also 82B43, 82C43] 82B43: Percolation [See also 60K35]

Gaussian free field disconnection level-set percolation entropic repulsion

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Nitzschner, Maximilian. Disconnection by level sets of the discrete Gaussian free field and entropic repulsion. Electron. J. Probab. 23 (2018), paper no. 105, 21 pp. doi:10.1214/18-EJP226. https://projecteuclid.org/euclid.ejp/1540260051

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