Multiplicity one for wildly ramified representations
Abstract
Let be a totally real field in which is unramified. Let be a modular Galois representation which satisfies the Taylor-Wiles hypotheses and is generic at a place above . Let be the corresponding Hecke eigensystem. Then the -torsion in the mod cohomology of Shimura curves with full congruence level at coincides with the -representation constructed by Breuil and Pa\v{s}k\={u}nas. In particular, it depends only on the local representation , and its Jordan-H\"older factors appear with multiplicity one. This builds on and extends work of the author with Morra and Schraen and independently of Hu-Wang, which proved these results when was additionally assumed to be tamely ramified. The main new tool is a method for computing Taylor-Wiles patched modules of integral projective envelopes using multitype tamely potentially Barsotti-Tate deformation rings and their intersection theory.
Cite
@article{arxiv.1708.04582,
title = {Multiplicity one for wildly ramified representations},
author = {Daniel Le},
journal= {arXiv preprint arXiv:1708.04582},
year = {2019}
}
Comments
20 pages