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arXiv 1109.5564hep-th
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T函数与多胶子散射振幅

T-functions and multi-gluon scattering amplitudes

Yasuyuki Hatsuda, Katsushi Ito, Yuji Satoh

摘要:

研究了N=4的超杨-米尔斯理论中强耦合下的胶子散射振幅/威尔逊圈,这些胶子散射振幅/威尔逊圈对应于AdS_3中具有类光多边形边界的极小曲面.我们找到了一个简洁的表达的剩余功能的T-功能的相关的热力学Bethe anatomy(TBA)系统。继续我们以前关于CFT/正多边形极限的解析展开式的工作,我们导出了一般2n点余函数的首阶展开式。T-系统允许我们编码其动量依赖于TBA质量参数,这是由共形微扰理论得到的只有一个函数。在单质量情况下,我们计算了它的显式形式。我们还发现,重标度的剩余函数在强耦合和在两个循环是彼此接近,和他们的比率在领先的顺序接近常数0.9的大n。

英文摘要:

We study gluon scattering amplitudes/Wilson loops in N=4 super Yang-Mills theory at strong coupling which correspond to minimal surfaces with a light-like polygonal boundary in AdS_3. We find a concise expression of the remainder function in terms of the T-function of the associated thermodynamic Bethe ansatz (TBA) system. Continuing our previous work on the analytic expansion around the CFT/regular-polygonal limit, we derive a formula of the leading-order expansion for the general 2n-point remainder function. The T-system allows us to encode its momentum dependence in only one function of the TBA mass parameters, which is obtained by conformal perturbation theory. We compute its explicit form in the single mass cases. We also find that the rescaled remainder functions at strong coupling and at two loops are close to each other, and their ratio at the leading order approaches a constant near 0.9 for large n.

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