Langlands duality in Liouville-H_3^+ WZNW correspondence

TL;DR

This paper explores the realization of Langlands duality in the correlation functions of the H_3^+ WZNW model, deriving dual formulas, studying symmetries, and connecting to the quantum geometric Langlands correspondence.

Contribution

It introduces a dual version of the SRT formula, interprets it via Hamiltonian reduction, and links the H_3^+ WZNW model to a family of non-rational CFTs, advancing understanding of Langlands duality.

Findings

Derived a dual SRT formula relating H_3^+ WZNW and Liouville theories.

Identified symmetries in new non-rational CFTs related to Langlands duality.

Connected correlation functions to quantum geometric Langlands correspondence.

Abstract

We show a physical realization of the Langlands duality in correlation functions of H_3^+ WZNW model. We derive a dual version of the Stoyanovky-Riabult-Teschner (SRT) formula that relates the correlation function of the H_3^+ WZNW and the dual Liouville theory to investigate the level duality k-2 \to (k-2)^{-1} in the WZNW correlation functions. Then, we show that such a dual version of the H_3^+ - Liouville relation can be interpreted as a particular case of a biparametric family of non-rational CFTs based on the Liouville correlation functions, which was recently proposed by Ribault. We study symmetries of these new non-rational CFTs and compute correlation functions explicitly by using the free field realization to see how a generalized Langlands duality manifests itself in this framework. Finally, we suggest an interpretation of the SRT formula as realizing the Drinfeld-Sokolov Hamiltonian reduction. Again, the Hamiltonian reduction reveals the Langlands duality in the H_3^+ WZNW model. Our new identity for the correlation functions of H_3^+ WZNW model may yield a first step to understand quantum geometric Langlands correspondence yet to be formulated mathematically.