Automorphic spectra and the conformal bootstrap

Author:

Kravchuk Petr,Mazáč Dalimil,Pal Sridip

Abstract

We describe a new method for constraining Laplacian spectra of hyperbolic surfaces and 2-orbifolds. The main ingredient is consistency of the spectral decomposition of integrals of products of four automorphic forms. Using a combination of representation theory of P S L 2 ( R ) \mathrm {PSL}_2(\mathbb {R}) and semidefinite programming, the method yields rigorous upper bounds on the Laplacian spectral gap. In several examples, the bound is nearly sharp. For instance, our bound on all genus-2 surfaces is λ 1 3.8388976481 \lambda _1\leq 3.8388976481 , while the Bolza surface has λ 1 3.838887258 \lambda _1\approx 3.838887258 . The bounds also allow us to determine the set of spectral gaps attained by all hyperbolic 2-orbifolds. Our methods can be generalized to higher-dimensional hyperbolic manifolds and to yield stronger bounds in the two-dimensional case. The ideas were closely inspired by modern conformal bootstrap.

Funder

Walter Burke Institute for Theoretical Physics

Publisher

American Mathematical Society (AMS)

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