N=4 SYM中多边形威尔逊圈的简单性
Simplicity of Polygon Wilson Loops in N=4 SYM
摘要：
具有类光多边形轮廓的威尔逊圈被证明等价于N=4超杨米尔斯中的MHV散射振幅。我们计算这样的威尔逊圈的特殊多边形轮廓在两个循环的微扰理论。具体来说，我们集中精力于通过从威尔逊圈中减去已知的ABDK/BDS ansatz获得的余项函数R。首先，我们考虑一个特定的二维八点运动学研究在强耦合的Alday和Maldacena。我们发现数值证据表明，R在弱耦合和强耦合下是相同的，直到达到一个总体的、依赖于耦合的常数。这表明了通用零多边形威尔逊圈的强耦合和弱耦合的余函数的普遍性，因此对于任意的MHV振幅在N=4超级杨米尔斯。我们分析了这一声明的后果。我们进一步考虑了正则n-范数，并通过数值计算发现余项函数在n=30时在n中是线性的。这再现了相应强耦合结果的一般特征。
英文摘要：
Wilson loops with lightlike polygonal contours have been conjectured to be equivalent to MHV scattering amplitudes in N=4 super Yang-Mills. We compute such Wilson loops for special polygonal contours at two loops in perturbation theory. Specifically, we concentrate on the remainder function R, obtained by subtracting the known ABDK/BDS ansatz from the Wilson loop. First, we consider a particular two-dimensional eight-point kinematics studied at strong coupling by Alday and Maldacena. We find numerical evidence that R is the same at weak and at strong coupling, up to an overall, coupling-dependent constant. This suggests a universality of the remainder function at strong and weak coupling for generic null polygonal Wilson loops, and therefore for arbitrary MHV amplitudes in N=4 super Yang-Mills. We analyse the consequences of this statement. We further consider regular n-gons, and find that the remainder function is linear in n at large n through numerical computations performed up to n=30. This reproduces a general feature of the corresponding strong-coupling result.
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