## Duke Mathematical Journal

### Quantum ergodicity and Benjamini–Schramm convergence of hyperbolic surfaces

#### Abstract

We present a quantum ergodicity theorem for fixed spectral window and sequences of compact hyperbolic surfaces converging to the hyperbolic plane in the sense of Benjamini and Schramm. This addresses a question posed by Colin de Verdière. Our theorem is inspired by results for eigenfunctions on large regular graphs by Anantharaman and Le Masson. It applies in particular to eigenfunctions on compact arithmetic surfaces in the level aspect, which connects it to a question of Nelson on Maass forms. The proof is based on a wave propagation approach recently considered by Brooks, Le Masson, and Lindenstrauss on discrete graphs. It does not use any microlocal analysis, making it quite different from the usual proof of quantum ergodicity in the large eigenvalue limit. Moreover, we replace the wave propagator with renormalized averaging operators over disks, which simplifies the analysis and allows us to make use of a general ergodic theorem of Nevo. As a consequence of this approach, we require little regularity on the observables.

#### Article information

Source
Duke Math. J., Volume 166, Number 18 (2017), 3425-3460.

Dates
Received: 25 April 2017
Revised: 15 May 2017
First available in Project Euclid: 13 October 2017

Permanent link to this document
https://projecteuclid.org/euclid.dmj/1507860019

Digital Object Identifier
doi:10.1215/00127094-2017-0027

Mathematical Reviews number (MathSciNet)
MR3732880

Zentralblatt MATH identifier
1384.37035

#### Citation

Le Masson, Etienne; Sahlsten, Tuomas. Quantum ergodicity and Benjamini–Schramm convergence of hyperbolic surfaces. Duke Math. J. 166 (2017), no. 18, 3425--3460. doi:10.1215/00127094-2017-0027. https://projecteuclid.org/euclid.dmj/1507860019

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