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arXiv 1011.5378hep-th
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N<8超引力的微扰展开

Perturbative expansion of N<8 Supergravity

David C. Dunbar, James H. Ettle, Warren B. Perkins

摘要:

我们计算了N=6和N=4的四维超引力的单圈振幅。对于N=6,我们发现,单圈n点振幅可以展开的标量盒和三角函数。这种简化与圈动量功率计数n-3是一致的,我们将其解释为引力的n+4,而N=6超代数中的另一个是-7。对于N=4,我们发现振幅与环动量功率计数n一致,我们将其解释为n+4,对于引力,从N=4超代数进一步增加-4。具体地,N=4个振幅包含不可切割构造的有理项。

英文摘要:

We characterise the one-loop amplitudes for N=6 and N=4 supergravity in four dimensions. For N=6 we find that the one-loop n-point amplitudes can be expanded in terms of scalar box and triangle functions only. This simplification is consistent with a loop momentum power count of n-3, which we would interpret as being n+4 for gravity with a further -7 from the N=6 superalgebra. For N=4 we find that the amplitude is consistent with a loop momentum power count of n, which we would interpret as being n+4 for gravity with a further -4 from the N=4 superalgebra. Specifically the N=4 amplitudes contain non-cut-constructible rational terms.

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