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arXiv 1012.2359hep-th
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关于AdS3 CFT的模性质

On modular properties of the AdS3 CFT

Walter Baron, Carmen Nunez

摘要:

研究了AdS 3 WZNW模型的模性质.虽然欧氏配分函数是模不变的,但欧氏环面上的特征是不明确的,它们的模变换是未知的。我们重新考虑定义的洛伦兹环面上的字符,专注于其结构的分布。我们发现一个广义S矩阵,根据真正的模块化参数,其中有两个对角块和一个非对角块,混合离散和连续表示,我们完全确定的符号。然后,我们探讨了模变换,融合代数和边界状态之间的关系。我们明确地构造了极大对称D-膜的Ishibashi态,并通过广义Verlinde定理证明了广义S矩阵定义了与点状膜和H2膜相关的单点函数以及出现在点状D-膜开弦谱中的SL(2,R)的退化表示的融合规则.

英文摘要:

We study modular properties of the AdS3 WZNW model. Although the Euclidean partition function is modular invariant, the characters on the Euclidean torus are ill-defined and their modular transformations are unknown. We reconsider the characters defined on the Lorentzian torus, focusing on their structure as distributions. We find a generalized S matrix, depending on the sign of the real modular parameters, which has two diagonal blocks and one off-diagonal block, mixing discrete and continuous representations, that we fully determine. We then explore the relations among the modular transformations, the fusion algebra and the boundary states. We explicitly construct Ishibashi states for the maximally symmetric D-branes and show that the generalized S matrix defines the one-point functions associated to point-like and H2 branes as well as the fusion rules of the degenerate representations of SL(2,R) appearing in the open string spectrum of the point-like D-branes, through a generalized Verlinde theorem.

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