Wild Galois Representations: Elliptic curves over a $3$-adic field

Abstract

Given an elliptic curve $E$ over a local field $K$ with residue characteristic $3$, we investigate the action of the absolute Galois group of $K$ in the case of potentially good reduction. In particular the only not completely known case is that of the $\ell$-adic Galois representation attached to an elliptic curve such that the image of inertia is non-cyclic, and isomorphic to $C_3⋊C_4$. In this work we describe such a representation explicitly.

16 pages, final version to appear in Acta Arithmetica