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arXiv 0709.2368hep-thhep-ph
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平面胶子振幅/威尔逊圈对偶

On planar gluon amplitudes/Wilson loops duality

J. M. Drummond, J. Henn, G. P. Korchemsky, E. Sokatchev

摘要:

越来越多的证据表明,平面N=4 SYM理论中的壳层上胶子散射振幅等价于由外部胶子动量定义的直的、类光的段组成的轮廓上的威尔逊圈。这种等价性首先是在强耦合下使用AdS/CFT对应提出的,此后在微扰理论中弱耦合到一个回路时得到了验证。在这里,我们执行一个明确的双圈计算的威尔逊圈对偶的四胶子散射振幅,并证明该关系持有超过一个圈。我们还提出了一个反常的共形沃德恒等式,它唯一地固定了威尔逊圈的有限部分(直到一个附加常数)的形式对偶的四和五胶子振幅,在多胶子MHV振幅的BDS猜想完全一致。

英文摘要:

There is growing evidence that on-shell gluon scattering amplitudes in planar N=4 SYM theory are equivalent to Wilson loops evaluated over contours consisting of straight, light-like segments defined by the momenta of the external gluons. This equivalence was first suggested at strong coupling using the AdS/CFT correspondence and has since been verified at weak coupling to one loop in perturbation theory. Here we perform an explicit two-loop calculation of the Wilson loop dual to the four-gluon scattering amplitude and demonstrate that the relation holds beyond one loop. We also propose an anomalous conformal Ward identity which uniquely fixes the form of the finite part (up to an additive constant) of the Wilson loop dual to four- and five-gluon amplitudes, in complete agreement with the BDS conjecture for the multi-gluon MHV amplitudes.

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