Tame class field theory over local fields
Algebraic Geometry
2026-01-21 v2
Abstract
For a quasi-projective scheme admitting a smooth compactification over a local field of residue characteristic , we construct a continuous reciprocity homomorphism from a tame class group to the abelian tame etale fundamental group of . We describe the prime-to- parts of its kernel and cokernel. This generalizes the higher dimensional unramified class field theory over local fields by Jannsen-Saito and Forre. We also prove a finiteness theorem for the geometric part of the abelian tame etale fundamental group, generalizing the results of Grothendieck and Yoshida for the unramified fundamental group.
Cite
@article{arxiv.2209.02953,
title = {Tame class field theory over local fields},
author = {Rahul Gupta and Amalendu Krishna and Jitendra Rathore},
journal= {arXiv preprint arXiv:2209.02953},
year = {2026}
}
Comments
Substantial revision, 68 pages. A version of this paper is accepted to appear in Amer. J. Math