Light-cone quantization of the Liouville model.

Abstract

We present the quantization of the Liouville model defined in light-cone coordinates in (1,1) signature space. We take advantage of the representation of the Liouville field by the free field of the Backl\"und transformation and adapt the approach by Braaten, Curtright, and Thorn. Quantum operators of the Liouville field ${\ensuremath{\partial}}_{+}\ensuremath{\varphi}$, ${\ensuremath{\partial}}_{\ensuremath{-}}\ensuremath{\varphi}$, ${e}^{g\ensuremath{\varphi}}$, ${e}^{2g\ensuremath{\varphi}}$ are constructed consistently in terms of the free field. The Liouville model field theory space is found to be restricted to the sector with field momentum ${P}_{+}=\ensuremath{-}{P}_{\ensuremath{-}}$, ${P}_{+}>0$, which is a closed subspace for the Liouville theory operator algebra.