Base norm spaces--classical, complex, and noncommutative

TL;DR

This paper extends the theory of base norm spaces to complex and noncommutative settings, establishing dualities and exploring their connections with quantum convexity and noncommutative convex sets.

Contribution

It introduces a generalized framework for noncommutative base norm spaces, including duality results and a new class with fewer axioms for constructing examples.

Findings

Established duality between complex and noncommutative base norm spaces

Connected noncommutative base norm spaces with quantum convexity notions

Provided new examples of noncommutative base norm spaces

Abstract

We generalize the theory of base norm spaces to the complex case, and further to the noncommutative setting relevant to `quantum convexity'. In particular, we establish the duality between complex Archimedean order unit spaces and complex base norm spaces, as well as the corresponding duality between their noncommutative counterparts. Additional topics include an exploration of natural connections with various notions of quantum convexity and regularity of noncommutative convex sets, and an analysis of how these concepts interact with complexification. We also define, as in the classical case, a class that contains and generates the noncommutative base norm spaces, but is defined by fewer axioms. We show how this may be applied to provide new and interesting examples of noncommutative base norm spaces.