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arXiv 0906.3011hep-th
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S-对偶、't Hooft算子与算子乘积展开

S-duality, 't Hooft operators and the operator product expansion

Jaume Gomis, Takuya Okuda

摘要:

通过确定圆形BPS Wilson和't Hooft环算子的算子乘积展开,研究了N=4超Yang-Mills中任意规范群的S-对偶.利用最近提出的"t Hooft“算符的量子路径积分定义,在微扰论中计算了手征原算符的”t Hooft“圈算符展开式中的系数和应力-能量张量.在强耦合展开式中,确定了对偶威尔逊圈算子的相应算子乘积系数。在弱耦合展开下,t Hooft算子的结果精确地再现了对偶威尔逊圈算子在强耦合展开下的结果,从而证明了这些观测量的S对偶性的定量预言.

英文摘要:

We study S-duality in N=4 super Yang-Mills with an arbitrary gauge group by determining the operator product expansion of the circular BPS Wilson and 't Hooft loop operators. The coefficients in the expansion of an 't Hooft loop operator for chiral primary operators and the stress-energy tensor are calculated in perturbation theory using the quantum path-integral definition of the 't Hooft operator recently proposed. The corresponding operator product coefficients for the dual Wilson loop operator are determined in the strong coupling expansion. The results for the 't Hooft operator in the weak coupling expansion exactly reproduce those for the dual Wilson loop operator in the strong coupling expansion, thereby demonstrating the quantitative prediction of S-duality for these observables.

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