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arXiv 1202.5733hep-thhep-ph
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N=4 SYM中的5环Konishi

Five-loop Konishi in N=4 SYM

Burkhard Eden, Paul Heslop, Gregory P. Korchemsky, Vladimir A. Smirnov, Emery Sokatchev

摘要:

本文提出了一种计算弱耦合下N=4对称模型中Konishi反常维数的新方法。它不依赖于传统的费曼图技术,也不局限于平面极限。它是基于OPE分析的四点关联函数的应力张量多重峰,最近已建成六个循环。Konishi算符对OPE的单态SU(4)通道有着重要的贡献。它的反常维数是双短距离极限中关联函数的对数的首单对数奇异性的系数,其中算子位置成对重合。我们正则化的关联函数在这个奇异的限制的维数正则化的版本的对数。在任何回路水平上,由此产生的奇异性是一个简单的极点,其残留物是由一个有限的两点积分少一个loop.这大大简化了五圈计算Konishi反常维数减少到一组已知的四圈两点积分和两个未知的积分,我们评估分析。我们得到了一个分析结果,在五个循环的平面极限和观察完美的协议与预测的基础上可积性AdS/CFT。

英文摘要:

We present a new method for computing the Konishi anomalous dimension in N=4 SYM at weak coupling. It does not rely on the conventional Feynman diagram technique and is not restricted to the planar limit. It is based on the OPE analysis of the four-point correlation function of stress-tensor multiplets, which has been recently constructed up to six loops. The Konishi operator gives the leading contribution to the singlet SU(4) channel of this OPE. Its anomalous dimension is the coefficient of the leading single logarithmic singularity of the logarithm of the correlation function in the double short-distance limit, in which the operator positions coincide pairwise. We regularize the logarithm of the correlation function in this singular limit by a version of dimensional regularization. At any loop level, the resulting singularity is a simple pole whose residue is determined by a finite two-point integral with one loop less. This drastically simplifies the five-loop calculation of the Konishi anomalous dimension by reducing it to a set of known four-loop two-point integrals and two unknown integrals which we evaluate analytically. We obtain an analytic result at five loops in the planar limit and observe perfect agreement with the prediction based on integrability in AdS/CFT.

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