# Signed Shintani cones for number fields with one complex place

## TL;DR

This paper constructs a signed fundamental domain for the action of totally positive units in certain number fields, facilitating the study of Dedekind zeta functions even when true fundamental domains are unavailable.

## Contribution

It introduces a method to build signed fundamental domains using k-rational simplicial cones for number fields with one complex place, applicable to any set of fundamental units.

## Key findings

- Provides a signed fundamental domain for specific number fields.
- Enables study of Dedekind zeta functions without true fundamental domains.
- Constructs from any set of fundamental units.

## Abstract

We give a signed fundamental domain for the action on $\mathbb{C}^*\times \mathbb{R}_+^{n-2}$ of the totally positive units $E(k)_+$ of a number field $k$ of degree $n$ and having exactly one pair of complex embeddings. This signed fundamental domain, built of $k$-rational simplicial cones, is as convenient as a true fundamental domain for the purpose of studying Dedekind zeta functions. However, while there is no general construction of a true fundamental domain, we construct a signed fundamental domain from any set of fundamental units of $k$.