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arXiv 1102.4196hep-thmath-phmath.MP
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SL(2,R)WZW模型的对偶性和推广手征对称性

On duality and extended chiral symmetry in the SL(2,R) WZW model

Jens Fjelstad

摘要:

研究了SL(2,R)WZW模型的两个手征性质。首先,阐明了初等场的对偶性或共轭性的意义。从离散级数得到的一类模块它示出,通过看两点共形块的空间,contragradient模块的自然定义提供了一个合适的概念共轭的主要领域,符合已知的两点功能。我们发现强有力的迹象表明,一个明显的矛盾与SL(2,R)的Clebsch-Gordan系列,并提出融合规则,是由某个类别的nonsemisimplicity。其次,结果表明,一个无限循环简单的电流群,对应于谱流自同构。特别是,对应于甚至光谱流的子群提供了一个假设的扩展手征代数的一部分,从而导致建议的模块化不变的批量光谱。

英文摘要:

Two chiral aspects of the SL(2,R) WZW model in an operator formalism are investigated. First, the meaning of duality, or conjugation, of primary fields is clarified. On a class of modules obtained from the discrete series it is shown, by looking at spaces of two-point conformal blocks, that a natural definition of contragredient module provides a suitable notion of conjugation of primary fields, consistent with known two-point functions. We find strong indications that an apparent contradiction with the Clebsch-Gordan series of SL(2,R), and proposed fusion rules, is explained by nonsemisimplicity of a certain category. Second, results indicating an infinite cyclic simple current group, corresponding to spectral flow automorphisms, are presented. In particular, the subgroup corresponding to even spectral flow provides part of a hypothetical extended chiral algebra resulting in proposed modular invariant bulk spectra.

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