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arXiv 1802.05201hep-th
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$\mathcal{N}=4$ SYM中威尔逊圈上的精确关联函数:局部化、缺陷CFT和可积性

Exact Correlators on the Wilson Loop in $\mathcal{N}=4$ SYM: Localization, Defect CFT, and Integrability

Simone Giombi, Shota Komatsu

摘要:

利用超对称局部化、OPE和Gram-Schmidt正交化方法计算了$\mathcal{N}=4$ SYM中1/8 BPS威尔逊圈上算子插入的关联函数.这些关联函数具有简单的行列式结构,位置无关,并形成一个拓扑子扇区,但依赖于t Hooft耦合和规范群的秩。当应用于1/2 BPS圆形(或直)威尔逊圈,我们的结果提供了一个无限的家庭的确切的缺陷CFT数据,包括结构常数的保护缺陷原色的任意长度插入的循环。在强耦合,我们显示出精确的协议与直接计算使用微扰理论周围的AdS $_2$弦世界表。我们还解释了我们的结果的连接到“广义韧致辐射函数”以前计算的可积性技术,再现已知的结果在平面极限,以及获得一些有限的N推广。此外,我们表明,在大N的关联函数可以重铸为简单的积分的多项式(称为Q函数)的产品出现在量子谱曲线的方法。这表明了一个有趣的相互作用之间的本地化,缺陷CFT和可集成性。

英文摘要:

We compute a set of correlation functions of operator insertions on the 1/8 BPS Wilson loop in $\mathcal{N}=4$ SYM by employing supersymmetric localization, OPE and the Gram-Schmidt orthogonalization. These correlators exhibit a simple determinant structure, are position-independent and form a topological subsector, but depend nontrivially on the 't Hooft coupling and the rank of the gauge group. When applied to the 1/2 BPS circular (or straight) Wilson loop, our results provide an infinite family of exact defect CFT data, including the structure constants of protected defect primaries of arbitrary length inserted on the loop. At strong coupling, we show precise agreement with a direct calculation using perturbation theory around the AdS$_2$ string worldsheet. We also explain the connection of our results to the "generalized Bremsstrahlung functions" previously computed from integrability techniques, reproducing the known results in the planar limit as well as obtaining some of their finite N generalizations. Furthermore, we show that the correlators at large N can be recast as simple integrals of products of polynomials (known as Q-functions) that appear in the Quantum Spectral Curve approach. This suggests an interesting interplay between localization, defect CFT and integrability.

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