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arXiv 0910.2225hep-th
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S-对偶与二维拓扑QFT

S-duality and 2d Topological QFT

Abhijit Gadde, Elli Pomoni, Leonardo Rastelli, Shlomo S. Razamat

摘要:

研究了Gaiotto最近提出的N=2的4d超共形场论的超共形指数.这些理论是通过紧化黎曼曲面上的(2,0)6d理论而定义的。我们解释的指数的4d理论与一个n-穿孔黎曼表面作为n-点的关联函数的二维拓扑QFT生活在表面上。指数在广义S-对偶变换(黎曼曲面的映射类群)下的不变性转化为二维TQFT的算子代数的结合性。在A_1情形下,4维SCFT具有拉格朗日实现,2维TQFT的结构常数和度量可以用椭圆gamma函数显式计算。结合然后举行由于一个显着的对称性椭圆超几何β积分,最近证明了范德布尔特。

英文摘要:

We study the superconformal index for the class of N=2 4d superconformal field theories recently introduced by Gaiotto. These theories are defined by compactifying the (2,0) 6d theory on a Riemann surface with punctures. We interpret the index of the 4d theory associated to an n-punctured Riemann surface as the n-point correlation function of a 2d topological QFT living on the surface. Invariance of the index under generalized S-duality transformations (the mapping class group of the Riemann surface) translates into associativity of the operator algebra of the 2d TQFT. In the A_1 case, for which the 4d SCFTs have a Lagrangian realization, the structure constants and metric of the 2d TQFT can be calculated explicitly in terms of elliptic gamma functions. Associativity then holds thanks to a remarkable symmetry of an elliptic hypergeometric beta integral, proved very recently by van de Bult.

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