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arXiv 0904.4675hep-th
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具有自交叉的双威尔逊圈和威尔逊圈/振幅猜想

Null Wilson loops with a self-crossing and the Wilson loop/amplitude conjecture

George Georgiou

摘要:

本文阐明了零尖威尔逊圈与其相应振幅之间的关系。我们发现,与没有自交叉的情况相比,自交叉威尔逊圈的单圈期望值产生了与交叉相关联的额外的1/ε奇异性。有趣的是,在对应的运动学极限处,在BDS猜想中出现的一个环振幅的有限部分中存在相同的1/ε极点。在两个循环中,我们探索剩余函数R的行为,编码BDS猜想的振幅偏差。通过对具有简单自交叉的威尔逊圈的重整化群方程的分析,我们证明了当逼近具有简单自交叉的组态(u_2 \to 1,u_1 \approx u_3)时,R在虚方向上发散,类似于R~i π \log^3(1-u_2).这种行为可以归因于非平凡的解析延续时,需要通过从欧几里德的物理区域,并建议,R有一个分支削减在负u_2轴时,其他两个交比近似相等(u_1 \approx u_3)。

英文摘要:

The present study illuminates the relation between null cusped Wilson loops and their corresponding amplitudes. We find that, compared to the case with no self-crossing, the one loop expectation value of a self-intersecting Wilson loop develops an additional 1/εsingularity associated to the intersection. Interestingly, the same 1/εpole exists in the finite part of the one loop amplitude, appearing in the BDS conjecture, at the corresponding kinematic limit. At two loops, we explore the behaviour of the remainder function R, encoding the deviation of the amplitude from the BDS conjecture. By analysing the renormalisation group equations for the Wilson loop with a simple self-crossing, we argue that, when approaching the configuration with a self-crossing (u_2 \to 1, u_1\approx u_3), R diverges in the imaginary direction like R ~ i π\log^3(1-u_2). This behaviour can be attributed to the non-trivial analytic continuation needed when passing from the Euclidean to the physical region and suggests that R has a branch cut in the negative u_2 axis when the two other cross ratios are approximately equal (u_1 \approx u_3).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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