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arXiv 0706.0744hep-thcond-mat.stat-mechmath-phmath.MPmath.QAmath.RT
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超群WZNW模型的自由费米子分辨

Free fermion resolution of supergroup WZNW models

Thomas Quella, Volker Schomerus

摘要:

扩展了我们在PSL(2)上的早期工作|2),我们解释了如何将一般I型超群上的WZNW模型的解约化为玻色子子群上的解。新的分析特别包括了超群GL(M| N)以及几个近亲,如PSL(N| N),某些Poincare超群和级数OSP(2| 2N)。这一显著的进步依赖于使用特殊的Feigin-Fuchs类型表示。在准备场论分析时,我们将利用自由费米子结构的一个小超空间模拟来推导第一类超群上的拉普拉斯算子的谱。后者被证明是不可对角化的。在将这些结果提升到完整的WZNW模型之后,我们讨论了场论的各种问题,包括它的模不变性和关联函数的计算。与以前的研究结果一致,超群WZNW模型允许在几何框架内研究对数共形场论的手征和非手征方面。我们将简要地指出如何从WZNW模型的见解结转到非几何的例子,例如W(p)三重模型。

英文摘要:

Extending our earlier work on PSL(2|2), we explain how to reduce the solution of WZNW models on general type I supergroups to those defined on the bosonic subgroup. The new analysis covers in particular the supergroups GL(M|N) along with several close relatives such as PSL(N|N), certain Poincare supergroups and the series OSP(2|2N). This remarkable progress relies on the use of a special Feigin-Fuchs type representation. In preparation for the field theory analysis, we shall exploit a minisuperspace analogue of a free fermion construction to deduce the spectrum of the Laplacian on type I supergroups. The latter is shown to be non-diagonalizable. After lifting these results to the full WZNW model, we address various issues of the field theory, including its modular invariance and the computation of correlation functions. In agreement with previous findings, supergroup WZNW models allow to study chiral and non-chiral aspects of logarithmic conformal field theory within a geometric framework. We shall briefly indicate how insights from WZNW models carry over to non-geometric examples, such as e.g. the W(p) triplet models.

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