A representative of $R\Gamma(N,T)$ for higher dimensional twists of $\mathbb Z_p^r(1)$

TL;DR

This paper extends the construction of a cohomologically trivial complex representing the Galois cohomology of higher-dimensional twists of 1Z_p^r(1) in the context of the equivariant local epsilon-constant conjecture for p-adic number fields.

Contribution

It generalizes the construction of a bounded complex representing R(N,T) to higher-dimensional Galois-stable lattices, advancing the study of epsilon-constant conjectures.

Findings

Constructed a bounded complex for higher-dimensional T

Extended previous methods to more complex Galois modules

Facilitated computations related to epsilon-constants

Abstract

Let $N/K$ be a Galois extension of $p$-adic number fields and let $V$ be a $p$-adic representation of the absolute Galois group $G_K$ of $K$. The equivariant local $\epsilon$-constant conjecture $C_{EP}^{na}(N/K, V)$ is related to the compatibility of the equivariant Tamagawa number conjecture with the functional equation of Artin $L$-functions and it can be formulated as the vanishing of a certain element $R_{N/K}$ in $K_0(\mathbb Z_p[G],\mathbb Q_p^c[G])$. One of the main technical difficulties in the computation of $R_{N/K}$ arises from the so-called cohomological term $C_{N/K}$, which requires the construction of a bounded complex $C_{N,T}^\bullet$ of cohomologically trivial modules which represents $R\Gamma(N,T)$ for a full $G_K$-stable $\mathbb Z_p$-sublattice $T$ of $V$. In this paper we generalize the construction of $C_{N,T}^\bullet$ in Thm. 2 of arXiv:1602.07858 to the case of a higher dimensional $T$.