Sato-Tate Equidistribution for Families of Automorphic Representations through the Stable Trace Formula

TL;DR

This paper extends Sato-Tate equidistribution results for automorphic representations by using hyperendoscopy techniques and a generalized trace formula, focusing on specific Archimedean components and non-cuspidal groups.

Contribution

It introduces a hyperendoscopy approach for families with fixed discrete-series components and extends Arthur's trace formula to broader classes of groups.

Findings

Extended equidistribution bounds to fixed discrete-series cases

Developed hyperendoscopy for groups without simply connected derived subgroup

Generalized trace formula for non-cuspidal groups

Abstract

In arXiv:1208.1945, Shin and Templier proved certain equidistribution bounds on local components of certain families of automorphic representations. We extend their weight-aspect results to families of automorphic representations where the Archimedean component is restricted to a single discrete-series representation instead of an entire $L$-packet. We do this by using a so-called "hyperendoscopy" version of the stable trace formula developed by Ferrari. The main technical difficulties are defining a version of hyperendoscopy that works for groups without simply connected derived subgroup and bounding the values of transfers of unramified functions. We also present an extension of Arthur's simple trace formula for test functions with Euler-Poincar\'e component at infinity to non-cuspidal groups since it does not seem to appear elsewhere in the literature.