Endomorphisms on Half-Sided Modular Inclusions

TL;DR

This paper explores the relationship between endomorphisms, weights, and half-sided modular inclusions in algebraic quantum field theory, establishing new correspondences and frameworks for analyzing nets of von Neumann algebras.

Contribution

It introduces a novel correspondence between weights on half-sided modular inclusions and Moebius covariant endomorphisms, simplifying their analysis.

Findings

Finite index endomorphisms extend to nets of von Neumann algebras.

A new approach encodes endomorphisms into half-sided modular inclusions.

Basic properties of weights on half-sided modular inclusions are established.

Abstract

In algebraic quantum field theory we consider nets of von Neumann algebras indexed over regions of the space-time. Wiesbrock has shown that strongly additive nets of von Neumann algebras on the circle are in correspondence with standard half-sided modular inclusions. We show that a finite index endomorphism on a half-sided modular inclusion extends to a finite index endomorphism on the corresponding net of von Neumann algebras on the circle. Moreover, we present another approach to encoding endomorphisms on nets of Neumann algebras on the circle into half-sided modular inclusions. There is a natural way to associate a weight to a Moebius covariant endomorphism. The properties of this weight has been studied by Bertozzini, Conti and Longo. In this paper we show the converse, namely how to associate a Moebius covariant endomorphism to a given weight under certain assumptions, thus obtaining a correspondence between a class of weights on a half-sided modular inclusion and a subclass of the Moebius covariant endomorphisms on the associated net of von Neumann algebras. This allows us to treat Moebius covariant endomorphisms in terms of weights on half-sided modular inclusions. As our aim is to provide a framework for treating endomorphisms on nets of von Neumann algebras in terms of the apparently simpler objects of weights on half-sided modular inclusions, we lastly give some basic results for manipulations with such weights.