String-- and Brane--Localized Causal Fields in a Strongly Nonlocal Model

Abstract

We study a weakly local, but nonlocal model in spacetime dimension $d\ge 2$ and prove that it is maximally nonlocal in a certain specific quantitative sense. Nevertheless, depending on the number of dimensions $d$, it has string--localized or brane--localized operators which commute at spatial distances. In two spacetime dimensions, the model even comprises a covariant and local subnet of operators localized in bounded subsets of Minkowski space which has a nontrivial scattering matrix. The model thus exemplifies the algebraic construction of local observables from algebras associated with nonlocal fields.

paper re-written with a change of emphasis and new results