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arXiv 1107.5702hep-th
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具有局部算子的零多边形威尔逊圈的关联函数

Correlation function of null polygonal Wilson loops with local operators

L. F. Alday, E. I. Buchbinder, A. A. Tseytlin

摘要:

在平面N =4超Yang-Mills理论中,研究了具有n个尖点的类光多边形威尔逊圈与局部算子(如旋子或手征标量)的关联子<W_nO(x)>.由于共形对称性,这种相关器的主要部分是3 n-11共形比的函数F。第一个非平凡的情况是n=4,当F只依赖于一个共形比时。这使得相应的相关器成为最简单的非平凡的可观测量之一,人们希望计算`t Hooft耦合λ的一般值。我们在强耦合区(使用半经典AdS 5 x S5弦论)和弱耦合区(使用微扰规范理论)计算F(λ,λ)的首阶.对于多边形威尔逊圈的边数多于四边的情形也得到了一些结果。此外,我们还讨论了arXiv:1007.3243中提出的零分离位置的局部算子的相关器与尖威尔逊圈之间的关系。

英文摘要:

We consider the correlator <W_n O(x)> of a light-like polygonal Wilson loop with n cusps with a local operator (like the dilaton or the chiral primary scalar) in planar N =4 super Yang-Mills theory. As a consequence of conformal symmetry, the main part of such correlator is a function F of 3n-11 conformal ratios. The first non-trivial case is n=4 when F depends on just one conformal ratio ζ. This makes the corresponding correlator one of the simplest non-trivial observables that one would like to compute for generic values of the `t Hooft coupling λ. We compute F(ζ,λ) at leading order in both the strong coupling regime (using semiclassical AdS5 x S5 string theory) and the weak coupling regime (using perturbative gauge theory). Some results are also obtained for polygonal Wilson loops with more than four edges. Furthermore, we also discuss a connection to the relation between a correlator of local operators at null-separated positions and cusped Wilson loop suggested in arXiv:1007.3243.

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