On group averaging for non-compact groups

Abstract

We review some aspects of the use of a technique known as group averaging, which provides a tool for the study of constrained systems. We focus our attention on the case where the gauge group is non-compact, and a `renormalized' group averaging method must be introduced. We discuss the connection between superselection sectors and the rate of divergence of the group averaging integral.

arXiv comment5 pages, for the proceedings of the 9th Marcel Grossmann Conference, Rome 2000

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