Ward identities in the $\mathfrak{sl}_3$ Toda conformal field theory

TL;DR

This paper rigorously proves the spin-three Ward identities in the $rak{sl}_3$ Toda conformal field theory, establishing higher-spin symmetry within a probabilistic framework and providing explicit formulas for descendent fields.

Contribution

It demonstrates the validity of higher-spin Ward identities in $rak{sl}_3$ Toda CFT using a rigorous probabilistic approach and introduces explicit descendent field expressions.

Findings

Proof of spin-three Ward identities in $rak{sl}_3$ Toda CFT

Explicit formulas for descendent fields

Identification of solutions to third-order hypergeometric equations

Abstract

Toda conformal field theories are natural generalizations of Liouville conformal field theory that enjoy an enhanced level of symmetry. In Toda conformal field theories this higher-spin symmetry can be made explicit, thanks to a path integral formulation of the model based on a Lie algebra structure. The purpose of the present document is to explain how this higher level of symmetry can manifest itself within the rigorous probabilistic framework introduced by R. Rhodes, V. Vargas and the first author. One of its features is the existence of holomorphic currents that are introduced via a rigorous derivation of the Miura transformation. More precisely, we prove that the spin-three Ward identities, that encode higher-spin symmetry, hold in the $\mathfrak{sl}_3$ Toda conformal field theory; as an original input we provide explicit expressions for the descendent fields which were left unidentified in the physics literature. This representation of the descendent fields provides a new systematic method to find the degenerate fields of the $\mathfrak{sl}_3$ Toda (and Liouville) conformal field theory, which in turn implies that certain four-point correlation functions are solutions of an hypergeometric differential equation of the third order.