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arXiv 1102.2477hep-th
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g-函数与强耦合下胶子散射振幅

g-Functions and gluon scattering amplitudes at strong coupling

Yasuyuki Hatsuda, Katsushi Ito, Kazuhiro Sakai, Yuji Satoh

摘要:

在热力学Bethe模型的基础上,通过计算AdS_3中极小曲面的面积,研究了N=4超Yang-Mills理论中强耦合下的胶子散射振幅/威尔逊圈.剩余函数的振幅计算通过评估的自由能,T-和Y-函数的均匀sine-Gordon模型。利用共形场论(CFT)微扰,研究了正多边形威尔逊圈对应的CFT点附近自由能的质量修正。基于T-函数和g-函数之间的等价性,我们计算了T-函数和Y-函数的修正,并将它们在CFT点处用模S-矩阵表示。我们明确地评估了8点和10点振幅的CFT点周围的剩余函数,并将这些解析表达式与2-loop公式进行了比较。这两个重标度的余项函数显示出非常相似的幂级数结构。

英文摘要:

We study gluon scattering amplitudes/Wilson loops in N=4 super Yang-Mills theory at strong coupling by calculating the area of the minimal surfaces in AdS_3 based on the associated thermodynamic Bethe ansatz system. The remainder function of the amplitudes is computed by evaluating the free energy, the T- and Y-functions of the homogeneous sine-Gordon model. Using conformal field theory (CFT) perturbation, we examine the mass corrections to the free energy around the CFT point corresponding to the regular polygonal Wilson loop. Based on the equivalence between the T-functions and the g-functions, which measure the boundary entropy, we calculate corrections to the T- and Y-functions as well as express them at the CFT point by the modular S-matrix. We evaluate the remainder function around the CFT point for 8 and 10-point amplitudes explicitly and compare these analytic expressions with the 2-loop formulas. The two rescaled remainder functions show very similar power series structures.

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