GRAVITY MATTER COUPLINGS FROM LIOUVILLE THEORY

被引:27
作者
GERVAIS, JL
机构
[1] Laboratoire de Physique Théorique de l'École Normale Supérieure 1 1 Unité Propre du Centre National de la Recherche Scientifique, associée à l École Normale Supérieure et à l'Université de Paris-Sud., 24 rue Lhomond
关键词
D O I
10.1016/0550-3213(93)90150-N
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
The three-point functions for minimal models coupled to gravity are derived in the operator approach to Liouville theory which is based on its U(q)(sl(2)) quantum group structure. The gravity-matter coupling is formulated by treating the latter as a continuation of the former. The result is very simple, and shown to agree with matrix model calculations on the sphere. The precise definition of the corresponding cosmological constant is given in the operator solution of the quantum Liouville theory. It is shown that the symmetry between quantum group spins J and -J-1 previously put forward by the authors is the explanation of the continuation in the number of screening operators discovered by Goulian and Li. Contrary to the previous discussions of this problem, the present approach clearly separates the emission operators for each leg. This clarifies the structure of the dressing by gravity. It is shown in particular that the end points are not treated on the same footing as the mid point. Since the outcome is completely symmetric this suggests the possibility of a picture-changing mechanism.
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页码:287 / 332
页数:46
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