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arXiv 0906.3495hep-th
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关于N=8的四圈超引力的UV连续性

On UV Finiteness of the Four Loop N=8 Supergravity

Renata Kallosh

摘要:

在N=8 d=4的超引力中,由于超对称性,4圈4点振幅是UV有限的。最近,通过[1]中的计算,已经建立了类似于N=4 SYM理论的4-回路4-点振幅的甚至更好的UV行为。n大于5的所有n点4环振幅在维数上都是有限的。然而,5点振幅的情况仍然不清楚。在本文中,我们将表明,5点4圈的振幅必须是有限的,由于超对称性,尽管事实上,$R^5$有一个超对称的推广N=1,N=2和N=4超对称。这意味着在N = 8的超引力中所有的4圈振幅都是UV有限的。我们还讨论了当前对更高循环的期望。

英文摘要:

The 4-loop 4-point amplitude in N=8 d=4 supergravity is UV finite due to supersymmetry. Even better UV behavior of the 4-loop 4-point amplitude, analogous to that of N=4 SYM theory, has been recently established by computation in [1]. All n-point 4-loop amplitudes with n greater than 5 are finite on dimensional grounds. However, the situation with the 5-point amplitudes remained unclear. In this paper we will show that the 5-point 4-loop amplitude must be finite due to supersymmetry, despite the fact that $R^5$ has a supersymmetric generalization for N=1, N=2 and N=4 SUSY. This means that all 4-loop amplitudes in N = 8 supergravity are UV finite. We also discuss the current expectations for higher loops.

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