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arXiv 0909.1105hep-th
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规范理论圈算符与刘维尔理论

Gauge Theory Loop Operators and Liouville Theory

Nadav Drukker, Jaume Gomis, Takuya Okuda, Joerg Teschner

摘要:

我们提出了S ^4上N=2的四维规范理论族中的圈算符--包括威尔逊、特胡夫特和双子算符--与黎曼曲面上的刘维尔理论圈算符之间的对应关系。这扩展了这些N=2的规范理论的配分函数与Alday、Gaiotto和Tachikawa发现的刘维尔算符之间的美丽关系。我们表明,这些刘维尔算子的计算与刘维尔回路算子的插入再现佩斯顿的公式捕获威尔逊圈算子在相应的规范理论的期望值。我们证明了Liouville圈算子的定义在模变换下是不变的,给出了我们的对应,暗示了S-对偶对规范理论圈算子的约束作用.我们在刘维尔理论中的计算对这些N=2规范理论中的't Hooft和双子圈算符的精确期望值作了明确的预言。刘维尔圈算子也被发现承认一个简单的几何解释在量子Teichmuller理论作为量子算子代表测地线的长度。我们研究了Liouville圈算符的代数,证明了我们的建议是正确的,同时也为规范理论中圈算符的算子乘积展开提供了明确的预言.

英文摘要:

We propose a correspondence between loop operators in a family of four dimensional N=2 gauge theories on S^4 -- including Wilson, 't Hooft and dyonic operators -- and Liouville theory loop operators on a Riemann surface. This extends the beautiful relation between the partition function of these N=2 gauge theories and Liouville correlators found by Alday, Gaiotto and Tachikawa. We show that the computation of these Liouville correlators with the insertion of a Liouville loop operator reproduces Pestun's formula capturing the expectation value of a Wilson loop operator in the corresponding gauge theory. We prove that our definition of Liouville loop operators is invariant under modular transformations, which given our correspondence, implies the conjectured action of S-duality on the gauge theory loop operators. Our computations in Liouville theory make an explicit prediction for the exact expectation value of 't Hooft and dyonic loop operators in these N=2 gauge theories. The Liouville loop operators are also found to admit a simple geometric interpretation within quantum Teichmuller theory as the quantum operators representing the length of geodesics. We study the algebra of Liouville loop operators and show that it gives evidence for our proposal as well as providing definite predictions for the operator product expansion of loop operators in gauge theory.

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