Wild Galois representations: elliptic curves with wild cyclic reduction
Abstract
In 1990, Kraus classified all possible inertia images of the -adic Galois representation attached to an elliptic curve over a non-archimedean local field. In previous work, the author computed explicitly the Galois representation of elliptic curves having non-abelian inertia image, a phenomenon which only occurs when the residue characteristic of the field of definition is or and the curve attains good reduction over some non-abelian ramified extension. In this work, the computation of the Galois representation in all the remaining wild cases, i.e. when the residue characteristic is or and the curve attains good reduction over an extension whose ramification degree is divisible by (without assuming the condition on the image of inertia being non-abelian), is completed. This is based on Chapter V of the author's PhD thesis.
Keywords
Cite
@article{arxiv.2506.20562,
title = {Wild Galois representations: elliptic curves with wild cyclic reduction},
author = {Nirvana Coppola},
journal= {arXiv preprint arXiv:2506.20562},
year = {2025}
}
Comments
Based on my PhD thesis. Comments are welcome!