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arXiv 1107.1504hep-th
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AdS/CFT中梅林振幅的费曼规则

Towards Feynman rules for Mellin amplitudes in AdS/CFT

Miguel F. Paulos

摘要:

我们研究了在$AdS$ /CFT中使用嵌入形式和Mellin变换计算树级共形关联函数。我们评估5点和6点梅林振幅在$ϕ^3$理论,甚至一个12点图在$ϕ^4$理论,使我们能够推测一组费曼规则的标量梅林振幅。一般顶点由Lauricella广义超几何函数给出。我们还展示了如何使用相同的组合梅林变换和嵌入形式主义的振幅涉及领域的自旋。通常出现的复杂的张量结构可以写成某些算子,它们在简单得多的指数结构上充当投影器--基本上与在平坦空间振幅中出现的相同。利用这些方法,我们能够评估一个四点电流图与电流交换的杨米尔斯理论。

英文摘要:

We investigate the use of the embedding formalism and the Mellin transform in the calculation of tree-level conformal correlation functions in $AdS$/CFT. We evaluate 5- and 6-point Mellin amplitudes in $ϕ^3$ theory and even a 12-pt diagram in $ϕ^4$ theory, enabling us to conjecture a set of Feynman rules for scalar Mellin amplitudes. The general vertices are given in terms of Lauricella generalized hypergeometric functions. We also show how to use the same combination of Mellin transform and embedding formalism for amplitudes involving fields with spin. The complicated tensor structures which usually arise can be written as certain operators acting as projectors on much simpler index structures - essentially the same ones appearing in a flat space amplitude. Using these methods we are able to evaluate a four-point current diagram with current exchange in Yang-Mills theory.

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