Local normality of infravacua and relative normalizers for relativistic systems

TL;DR

This paper proves local normality of infravacuum representations in relativistic quantum systems and extends the formalism of superselection sectors using second conjugate classes and relative normalizers.

Contribution

It provides a straightforward proof of local normality and extends the formalism of superselection sectors to the local relativistic setting.

Findings

Proved local normality of infravacuum representations

Extended superselection sector formalism to relativistic systems

Applied Araki-Yamagami criterion in this context

Abstract

We revisit the problem of local normality of Kraus-Polley-Reents infravacuum representations and provide a straightforward proof based on the Araki-Yamagami criterion. We apply this result to the theory of superselection sectors. Namely, we extend the novel formalism of second conjugate classes and relative normalizers to the local relativistic setting.