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arXiv 0903.0522hep-th
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威尔逊圈与胶子振幅的对偶性

Duality between Wilson loops and gluon amplitudes

J. M. Henn

摘要:

研究了N=4超杨-米尔斯中平面MHV胶子振幅与类光威尔逊圈之间的一种有趣的新对偶性。我们通过执行矩形和五边形的威尔逊圈的双循环计算来扩展先前的对偶检查。此外,我们还导出了威尔逊圈的全阶破缺共形沃德恒等式,并分析了其结果。从六个点开始,沃德恒等式允许在威尔逊圈的表达式中出现任意函数的共形不变量。我们计算这个函数在六个点和两个循环,并讨论其影响相应的胶子振幅。结果表明,这种对偶性与Bern等人关于胶子振幅的一个猜想不一致,Bern等人最近的一次计算表明,后者的猜想在六个胶子和两个圈处是不成立的.通过与他们的结果进行数值比较,我们发现胶子振幅与威尔逊圈之间的对偶性得以保持。这篇评论是基于作者的博士论文,包括发展,直到2008年5月。

英文摘要:

An intriguing new duality between planar MHV gluon amplitudes and light-like Wilson loops in N=4 super Yang-Mills is investigated. We extend previous checks of the duality by performing a two-loop calculation of the rectangular and pentagonal Wilson loop. Furthermore, we derive an all-order broken conformal Ward identity for the Wilson loops and analyse its consequences. Starting from six points, the Ward identity allows for an arbitrary function of conformal invariants to appear in the expression for the Wilson loop. We compute this function at six points and two loops and discuss its implications for the corresponding gluon amplitude. It is found that the duality disagrees with a conjecture for the gluon amplitudes by Bern et al. A recent calculation by Bern et al indeed shows that the latter conjecture breaks down at six gluons and at two loops. By doing a numerical comparison with their results we find that the duality between gluon amplitudes and Wilson loops is preserved. This review is based on the author's PhD thesis and includes developments until May 2008.

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