On the potential automorphy of certain odd-dimensional Galois representations

TL;DR

This paper extends potential automorphy results for Galois representations to odd dimensions n=3 and n=5, and conditionally to all odd n, using symmetric power automorphy of elliptic curves.

Contribution

It generalizes potential automorphy theorems from even to odd-dimensional Galois representations, leveraging symmetric power automorphy results.

Findings

Proves potential automorphy for n=3 and n=5.

Conditional extension to all odd n.

Utilizes symmetric power automorphy of elliptic curves.

Abstract

In a previous paper, the potential automorphy of certain Galois representations to GL_n for n even was established, following work of Harris, Shepherd-Barron and Taylor and using the lifting theorems of Clozel, Harris and Taylor. In this paper, we extend those results to n=3 and n=5, and conditionally to all other odd n. The key additional tools necessary are results which give the automorphy or potential automorphy of symmetric powers of elliptic curves, most notably those of Gelbert, Jacquet, Kim, Shahidi and Harris.