English

Explicit isomorphisms for a Herr-type complex over a metabelian extension

Number Theory 2026-03-24 v1 Representation Theory

Abstract

Let SS be a Banach algebra over Qp\mathbb{Q}_p whose residue fields are finite extensions of Qp\mathbb{Q}_p. Given an arithmetic family VV of Galois representations, i.e., a finite free SS-module VV with a continuous action of the absolute Galois group of a pp-adic number field, we construct a complex associated to VV over false-Tate extensions and construct explicit isomorphisms between its cohomology and the Galois cohomology. This recovers earlier results by Tavares Ribeiro when SS is a finite extension of Qp\mathbb{Q}_p.

Keywords

Cite

@article{arxiv.2603.21681,
  title  = {Explicit isomorphisms for a Herr-type complex over a metabelian extension},
  author = {Anand Chitrao and Aditya Karnataki and Jishnu Ray},
  journal= {arXiv preprint arXiv:2603.21681},
  year   = {2026}
}
R2 v1 2026-07-01T11:32:52.836Z