Voronoi-Hankel Transforms

Abstract

We prove that the $π$-Fourier transform introduced by Jiang--Luo and the Voronoi--Hankel transform for $π$ introduced by the last author are essentially the same one. We give a systematical study of the relevant kernel function in the non-archimedean case, including the asymptotic behavior at $0$ and $\infty$ and some simple integral representation based on the local Langlands correspondences for the essentially tame supercuspidals. As an application, we give an effective version of the stability theorem for the local gamma factors.