Harmonic Analysis and Gamma Functions on Symplectic Groups

Abstract

Over a $p$-adic local field $F$ of characteristic zero, we develop a new type of harmonic analysis on an extended symplectic group $G={\mathbb{G}}_m\times {\mathrm{S}p}_{2n}$. It is associated to the Langlands $\gamma$-functions attached to any irreducible admissible representations $\chi \otimes \pi$ of $G(F)$ and the standard representation $\rho$ of the dual group $G^{\vee }(\mathbb{C})$, and confirms a series of the conjectures in the local theory of the Braverman-Kazhdan proposal for the case under consideration. Meanwhile, we develop a new type of harmonic analysis on ${\mathrm{GL}}_1(F)$, which is associated to a $\gamma$-function ${\beta }_{\psi }({\chi }_s)$ (a product of $n+1$ certain abelian $\gamma$-functions). Our work on ${\mathrm{GL}}_1(F)$ plays an indispensable role in the development of our work on $G(F)$. These two types of harmonic analyses both specialize to the well-known local theory developed in Tate's thesis when $n=0$. The approach is to use the compactification of ${\mathrm{Sp}}_{2n}$ in the Grassmannian variety of ${\mathrm{Sp}}_{4n}$, with which we are able to utilize the well developed local theory of Piatetski-Shapiro and Rallis and many other works) on the doubling local zeta integrals for the standard $L$-functions of ${\mathrm{Sp}}_{2n}$. The method can be viewed as an extension of the work of Godement-Jacquet for the standard $L$-function of ${\mathrm{GL}}_n$ and is expected to work for all classical groups. We will consider the archimedean local theory and the global theory in our future work.

99 pages

References in corpus (3)

• Normalized intertwining operators and nilpotent elements in the Langlands dual group
• Formule des Traces et Fonctorialité: le Début d'un Programme
• Non-linear Fourier transforms and the Braverman-Kazhdan conjecture

Cited by in corpus (1)

• Certain Fourier Operators and their Associated Poisson Summation Formulae on ${\mathrm{GL}}_1$