Beyond the spherical sup-norm problem

Document Type

Article

Version

Final Published Version

Publication Title

Journal de Mathématiques Pures et Appliquées

Volume

168

Publication Date

2022

Abstract

We open a new perspective on the sup-norm problem and propose a version for non-spherical Maa ss forms when the maximal compact K is non-abelian and the dimension of the K -type gets large. We solve this problem for an arithmetic quotient of G = SL2(C) with K = SU2(C). Our results cover the case of vector-valued Maa ss forms as well as all the individual scalar-valued Maa ss forms of the Wigner basis, reaching sub-Weyl exponents in some cases. On the way, we develop analytic theory of independent interest, including uniform strong localization estimates for generalized spherical functions of high K -type and a Paley-Wiener theorem for the corresponding spherical transform acting on the space of rapidly decreasing functions. The new analytic properties of the generalized spherical functions lead to novel counting problems of matrices close to various manifolds that we solve optimally.

DOI

https://doi.org/10.1016/j.matpur.2022.09.009

Creative Commons License

Creative Commons Attribution 4.0 International License
This work is licensed under a Creative Commons Attribution 4.0 International License.

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