Superselection in the presence of constraints

Hellmut Baumgaertel, Hendrik Grundling
2005 Journal of Mathematical Physics  
For systems which contain both superselection structure and constraints, we study compatibility between constraining and superselection. Specifically, we start with a generalisation of Doplicher-Roberts superselection theory to the case of nontrivial centre, and a set of Dirac quantum constraints and find conditions under which the superselection structures will survive constraining in some form. This involves an analysis of the restriction and factorisation of superselection structures. We
more » ... lop an example for this theory, modelled on interacting QED.
doi:10.1063/1.1985038 fatcat:mys4f2td3bbefmk66toopoe5ae