The Gauge Group and Perturbation Semigroup of an Operator System

Abstract

The perturbation semigroup was first defined in the case of $\ast$-algebras by Chamseddine, Connes and van Suijlekom. In this paper, we take $\mathcal{E}$ as a concrete operator system with unit. We first give a definition of gauge group $\mathcal{G}(\mathcal{E})$ of $\mathcal{E}$, after that we give the definition of perturbation semigroup of $\mathcal{E}$, and the closed perturbation semigroup of $\mathcal{E}$ with respect to the Haagerup tensor norm. We also show that there is a continuous semigroup homomorphism from the closed perturbation semigroup to the collection of unital completely bounded Hermitian maps over $\mathcal{E}$. Finally we compute the gauge group and perturbation semigroup of the Toeplitz system as an example.

References in corpus (2)

• Spectral truncations in noncommutative geometry and operator systems
• Hill representations for *-linear matrix maps

Cited by in corpus (1)

• Convergence of Fourier truncations for compact quantum groups and finitely generated groups