Probability and Mathematical Physics Seminar

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Benjamini-Schramm conjecture and the loop O(n) model

Speaker: Alexander Glazman, University of Innsbruck

Location: Warren Weaver Hall 1302

Date: Friday, February 21, 2025, 11:10 a.m.

Synopsis:

We witness many phase transitions in everyday life (eg. ice melting to water). The mathematical approach to these phenomena revolves around the percolation model: given a graph, call each vertex open with probability p independently of the others and look at the subgraph induced by open vertices. Benjamini and Schramm conjectured in 1996 that, at p=1/2, on any planar graph, either there is no infinite connected components or infinitely many.

We prove a stronger version of this conjecture for virtually all planar graphs. We then use this to establish fractal macroscopic behaviour in the loop O(n) model. The latter includes a random discrete Lipschitz surface as a particular case.

Joint work with Matan Harel and Nathan Zelesko.