Beyond the spherical sup-norm problem
arXiv:2107.05973 · doi:10.1016/j.matpur.2022.09.009
Abstract
We open a new perspective on the sup-norm problem and propose a version for non-spherical Maass 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=SL_2(C) with K=SU_2(C). Our results cover the case of vector-valued Maass forms as well as all the individual scalar-valued Maass 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.
arXiv comment68 pages, LaTeX2e; to appear in Journal de Mathématiques Pures et Appliquées
References in corpus (9)
- Nodal domains of Maass forms I
- Uniform approximate functional equation for principal L-functions
- Hybrid sup-norm bounds for Maass newforms of powerful level
- Bounds for eigenforms on arithmetic hyperbolic 3-manifolds
- The sup-norm problem for GL(2) over number fields
- Lower bounds for Maass forms on semisimple groups
- The density hypothesis for horizontal families of lattices
- Theta functions, fourth moments of eigenforms, and the sup-norm problem I
- Ambient prime geodesic theorems on hyperbolic 3-manifolds