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arXiv 1012.2905hep-thmath-phmath.MPmath.QA
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k =-1/2的分数阶sl ^(2)-理论的融合

Fusion in Fractional Level sl^(2)-Theories with k=-1/2

David Ridout

摘要:

研究了在k =-1/2能级上具有sl ^(2)对称性的共形场论的融合规则。结果表明,在谱流条件下,不可约最高权模块及其像集的融合是封闭的,但当用"松弛最高权"代替"最高权"时,融合不封闭.对于定义良好的u ^(1)-陪集来说,松弛模的融合是必要的,它给出了Virasoro零模作用于其上的两类不可分解模。这证实了相关理论的对数性质。不可分解模的结构被完全确定为交错模,并证明了不存在对数耦合(β-不变量)。的c =-2三重态模型的融合环的关系和β-γ鬼系统的影响进行了简要的讨论。

英文摘要:

The fusion rules of conformal field theories admitting an sl^(2)-symmetry at level k=-1/2 are studied. It is shown that the fusion closes on the set of irreducible highest weight modules and their images under spectral flow, but not when "highest weight" is replaced with "relaxed highest weight". The fusion of the relaxed modules, necessary for a well-defined u^(1)-coset, gives two families of indecomposable modules on which the Virasoro zero-mode acts non-diagonalisably. This confirms the logarithmic nature of the associated theories. The structures of the indecomposable modules are completely determined as staggered modules and it is shown that there are no logarithmic couplings (beta-invariants). The relation to the fusion ring of the c=-2 triplet model and the implications for the beta gamma ghost system are briefly discussed.

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