The WZNW model by a perturbation of Witten's conformal solution

TL;DR

This paper investigates how perturbing the WZNW model at the conformal point with a sigma model term affects the system, revealing a transition from negative to positive level k in the large k limit.

Contribution

It demonstrates that perturbing the WZNW model at the conformal point causes a transition from negative to positive level k in the large k limit.

Findings

Perturbation leads to a change from negative to positive k.

Large k limit simplifies the analysis of the perturbed system.

The model exhibits a duality between negative and positive k regimes.

Abstract

The WZNW model at the Witten conformal point is perturbed by the sigma model term. It is shown that in the large level k limit the perturbed WZNW system with negative k arrives at the WZNW model with positive k.