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arXiv 1202.3692hep-th
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N = 4超引力中的R^4非重整化定理

An R^4 non-renormalisation theorem in N=4 supergravity

Piotr Tourkine, Pierre Vanhove

摘要:

我们考虑CHL结构中的四引力子振幅,提供具有不同数量的矢量多重态的四维N = 4模型。我们证明,在这些模型中,双环振幅的前因子为d^2R^4。这意味着R^4项存在一个非重整化定理,它禁止在四维空间中四引力子振幅出现三圈紫外发散。我们将R^4项的特殊性质与纯N = 4超引力的U(1)异常联系起来。

英文摘要:

We consider the four-graviton amplitudes in CHL constructions providing four-dimensional N=4 models with various numbers of vector multiplets. We show that in these models the two-loop amplitude has a prefactor of d^2R^4. This implies a non-renormalisation theorem for the R^4 term, which forbids the appearance of a three-loop ultraviolet divergence in four dimensions in the four-graviton amplitude. We connect the special nature of the R^4 term to the U(1) anomaly of pure N=4 supergravity.

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