# Galois Cohomology for Lubin-Tate $(\varphi_q,\Gamma_{LT})$-modules over Coefficient rings

## TL;DR

This paper advances the understanding of Galois cohomology for Lubin-Tate $(_q,_{LT})$-modules over coefficient rings, extending existing theories and computational tools to non-abelian extensions and broader coefficient contexts.

## Contribution

It introduces a complex for computing cohomology over Lubin-Tate extensions, extends it to non-abelian cases, and generalizes the theory to coefficient rings, building on and expanding prior work.

## Key findings

- Developed a complex for cohomology computation over Lubin-Tate extensions.
- Extended the complex to include certain non-abelian extensions.
- Generalized $(_q,_{LT})$-modules to coefficient rings, preserving equivalences.

## Abstract

The classification of the local Galois representations using $(\varphi,\Gamma)$-modules by Fontaine has been generalized by Kisin and Ren over the Lubin-Tate extensions of local fields using the theory of $(\varphi_q,\Gamma_{LT})$-modules. In this paper, we extend the work of (Fontaine) Herr by introducing a complex which allows us to compute cohomology over the Lubin-Tate extensions and compare it with the Galois cohomology groups. We further extend that complex to include certain non-abelian extensions. We then deduce some relations of this cohomology with those arising from $(\psi_q,\Gamma_{LT})$-modules. We also compute the Iwasawa cohomology over the Lubin-Tate extensions in terms of $\psi_q$-operator acting on the \'{e}tale $(\varphi_q,\Gamma_{LT})$-module attached to the local Galois representation. Moreover, we generalize the notion of $(\varphi_q,\Gamma_{LT})$-modules over the coefficient ring $R$ and show that the equivalence given by Kisin and Ren extends to the Galois representations over $R$. This equivalence allows us to generalize our results to the case of coefficient rings.