Simplicity of polygon Wilson loops in $$ \mathcal{N} $$ = 4 SYM

Simplicity of polygon Wilson loops in $$ \mathcal{N} $$ = 4 SYM
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$$ mathcal{N} $$ = 4 SYM 中多边形威尔逊循环的简单性

DOI:
10.1007/jhep01(2010)050
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发表时间:
2010
影响因子:
5.4
通讯作者:
Brandhuber A
Brandhuber A
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Brandhuber A

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具有类光多边形轮廓的Wilson环被证明等价于= 4超杨-米尔斯中的MHV散射振幅。我们计算这样的威尔逊环的特殊多边形轮廓在两个循环的扰动理论。具体来说,我们集中在剩余功能,从威尔逊循环减去已知的ABDK/BDS anastomic获得。首先,我们考虑一个特殊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,在弱耦合和强耦合,到一个整体,耦合依赖常数是相同的。这表明了通用零多边形威尔逊回路的强耦合和弱耦合的剩余函数的普遍性,因此对于任意MHV振幅= 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。
Wilson loops with lightlike polygonal contours have been conjectured to be equivalent to MHV scattering amplitudes in= 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, 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 thatis 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= 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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