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arXiv 1409.3089hep-th
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N = 5超引力中四圈紫外线的增强抵消

Enhanced Ultraviolet Cancellations in N = 5 Supergravity at Four Loop

Zvi Bern, Scott Davies, Tristan Dennen

摘要:

我们证明了N = 5超引力的四圈四点振幅在四维空间中是紫外有限的,这与基于超对称性和对偶对称性论点的预期相反。我们解释了为什么任何协变局部形式主义的图不能明显地表现出必要的有限性取消,而是需要一种新的类型的非平凡的紫外线取消,我们称之为“增强取消”。我们还表明,在N = 4和N = 5超引力理论的三圈四点振幅显示增强的取消。为了构造回路被积函数,我们利用颜色和运动学之间的对偶性。我们采用标准的方法提取紫外发散与FIRE 5积分减少程序,以达到四个循环的结果。

英文摘要:

We show that the four-loop four-point amplitudes of N = 5 supergravity are ultraviolet finite in four dimensions, contrary to expectations based on supersymmetry and duality-symmetry arguments. We explain why the diagrams of any covariant local formalism cannot manifestly exhibit the necessary cancellations for finiteness but instead require a new type of nontrivial ultraviolet cancellation that we call "enhanced cancellations". We also show that the three-loop four-point amplitudes in N = 4 and N = 5 supergravity theories display enhanced cancellations. To construct the loop integrand, we use the duality between color and kinematics. We apply standard methods for extracting ultraviolet divergences in conjunction with the FIRE5 integral reduction program to arrive at the four-loop results.

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