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arXiv 1604.03046hep-th
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N = 8超重力振幅的壳上图

On-Shell Diagrams for N = 8 Supergravity Amplitudes

Paul Heslop, Arthur E. Lipstein

摘要:

我们定义的递归关系N = 8超重力振幅使用的推广的平面N = 4超杨米尔斯开发的壳上图。虽然递归关系一般产生非平面上壳图,我们表明,在树级的递归可以选择只产生平面图,相同的图发生在平面N = 4理论。这意味着非平面图的非平凡恒等式以及N = 4和N = 8理论之间的有趣关系。我们证明了N = 8超引力的壳上图服从类似于N = 4超杨-米尔斯的壳上图的等价关系,并发展了一个直接从壳上图读出格拉斯曼积分公式的系统算法。我们还证明了N = 8超引力的1圈4点振幅可以由壳上图得到。

英文摘要:

We define recursion relations for N = 8 supergravity amplitudes using a generalization of the on-shell diagrams developed for planar N = 4 super-Yang-Mills. Although the recursion relations generically give rise to non-planar on-shell diagrams, we show that at tree-level the recursion can be chosen to yield only planar diagrams, the same diagrams occurring in the planar N = 4 theory. This implies non-trivial identities for non-planar diagrams as well as interesting relations between the N = 4 and N = 8 theories. We show that the on-shell diagrams of N = 8 supergravity obey equivalence relations analogous to those of N = 4 super-Yang-Mills, and we develop a systematic algorithm for reading off Grassmannian integral formulae directly from the on-shell diagrams. We also show that the 1-loop 4-point amplitude of N = 8 supergravity can be obtained from on-shell diagrams.

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