Towards the construction of quantum field theories from a factorizing S-matrix

TL;DR

This paper reviews a new rigorous method to construct quantum field theories in two dimensions starting from a factorizing S-matrix, involving semi-local fields and proving the existence of local observables.

Contribution

It introduces a novel two-step construction process for quantum field theories from a given S-matrix, including a new proof of the modular compactness condition.

Findings

Established a method to construct QFTs from S-matrices in 2D

Proved the modular compactness condition for wedge algebras

Demonstrated existence of local observables in these models

Abstract

Starting from a given factorizing S-matrix $S$ in two space-time dimensions, we review a novel strategy to rigorously construct quantum field theories describing particles whose interaction is governed by $S$. The construction procedure is divided into two main steps: Firstly certain semi-local Wightman fields are introduced by means of Zamolodchikov's algebra. The second step consists in proving the existence of local observables in these models. As a new result, an intermediate step in the existence problem is taken by proving the modular compactness condition for wedge algebras.