## The Annals of Probability

### Dynkin isomorphism and Mermin–Wagner theorems for hyperbolic sigma models and recurrence of the two-dimensional vertex-reinforced jump process

#### Abstract

We prove the vertex-reinforced jump process (VRJP) is recurrent in two dimensions for any translation invariant finite-range initial rates. Our proof has two main ingredients. The first is a direct connection between the VRJP and sigma models whose target space is a hyperbolic space $\mathbb{H}^{n}$ or its supersymmetric counterpart $\mathbb{H}^{2|2}$. These results are analogues of well-known relations between the Gaussian free field and the local times of simple random walk. The second ingredient is a Mermin–Wagner theorem for these sigma models. This result is of intrinsic interest for the sigma models and also implies our main theorem on the VRJP. Surprisingly, our Mermin–Wagner theorem applies even though the symmetry groups of $\mathbb{H}^{n}$ and $\mathbb{H}^{2|2}$ are nonamenable.

#### Article information

Source
Ann. Probab., Volume 47, Number 5 (2019), 3375-3396.

Dates
Revised: October 2018
First available in Project Euclid: 22 October 2019

https://projecteuclid.org/euclid.aop/1571731454

Digital Object Identifier
doi:10.1214/19-AOP1343

Mathematical Reviews number (MathSciNet)
MR4021254

Zentralblatt MATH identifier
07145320

#### Citation

Bauerschmidt, Roland; Helmuth, Tyler; Swan, Andrew. Dynkin isomorphism and Mermin–Wagner theorems for hyperbolic sigma models and recurrence of the two-dimensional vertex-reinforced jump process. Ann. Probab. 47 (2019), no. 5, 3375--3396. doi:10.1214/19-AOP1343. https://projecteuclid.org/euclid.aop/1571731454

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