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The Many Faces of the Quantum Liouville Exponentials | | Jean-Loup Gervais
; Jens Schnittger
; | | Date: |
27 Aug 1993 | | Journal: | Nucl.Phys. B413 (1994) 433-460 | | Abstract: | First, it is proven that the three main operator-approaches to the quantum Liouville exponentials --- that is the one of Gervais-Neveu (more recently developed further by Gervais), Braaten-Curtright-Ghandour-Thorn, and Otto-Weigt --- are equivalent since they are related by simple basis transformations in the Fock space of the free field depending upon the zero-mode only. Second, the GN-G expressions for quantum Liouville exponentials, where the $U_q(sl(2))$ quantum group structure is manifest, are shown to be given by q-binomial sums over powers of the chiral fields in the $J=1/2$ representation. Third, the Liouville exponentials are expressed as operator tau-functions, whose chiral expansion exhibits a q Gauss decomposition, which is the direct quantum analogue of the classical solution of Leznov and Saveliev. It involves q exponentials of quantum group generators with group "parameters" equal to chiral components of the quantum metric. Fourth, we point out that the OPE of the $J=1/2$ Liouville exponential provides the quantum version of the Hirota bilinear equation. | | Source: | arXiv, hep-th/9308134 | | Services: | Forum | Review | PDF | Favorites | |
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