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arXiv 1905.05151hep-th
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N=4超引力中的双圈n点异常振幅

Two-loop n-point anomalous amplitudes in N=4 supergravity

Zvi Bern, David Kosower, Julio Parra-Martinez

摘要:

利用么正性和双拷贝构造方法计算了N=4纯超引力中的反常双圈四点振幅。我们还提出了所有的条款确定的四维切割在两个全多重双圈异常超振幅。这一结果提供了第一个两圈n点重力振幅,一类待定的合理的条款,这是在四个点缺席。我们表明,最近提出的有限的counterterterm取消这些振幅到这个顺序。我们认为,反项不破坏的三圈有限性的异常振幅在N=4理论。

英文摘要:

We compute the anomalous two-loop four-point amplitudes in N=4 pure supergravity, using unitarity and the double-copy construction. We also present all terms determined by four-dimensional cuts in two all-multiplicity two-loop anomalous superamplitudes. This result provides the first two-loop n-point gravity amplitude, up to a class of undetermined rational terms, which are absent at four points. We show that a recently proposed finite counterterm cancels these amplitudes to this order. We argue that the counterterm does not spoil the three-loop finiteness of anomalous amplitudes in the N=4 theory.

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