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arXiv 1510.02409hep-th
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双圈超弦有效action中的红外发散和谐波反常

Infrared divergences and harmonic anomalies in the two-loop superstring effective action

Boris Pioline, Rodolfo Russo

摘要:

我们分析了微扰贡献的$D^4 R^4$和$D^6 R^4$耦合的低能量有效作用的第二类弦论紧化的环面$T^d$,特别强调两个循环的修正。一般来说,有必要引入红外截止$Λ$,以将局域相互作用与由于无质量态交换引起的非局域效应分开。我们确定了亏格2的黎曼曲面的退化,这是对$Λ$的类幂依赖性负责,并给出了一个明确的处方提取$Λ$无关的有效耦合。这些重整化耦合,然后示出的拉普拉斯算子相对于环面模的本征模,可计算的异常源项中产生的对数发散的存在下,在精确的协议从U-对偶的预测。我们对两圈$D^6 R^4$贡献的结果也探测了Kawazumi-Zhang不变量的基本性质

英文摘要:

We analyze the pertubative contributions to the $D^4 R^4$ and $D^6 R^4$ couplings in the low-energy effective action of type II string theory compactified on a torus $T^d$, with particular emphasis on two-loop corrections. In general, it is necessary to introduce an infrared cut-off $Λ$ to separate local interactions from non-local effects due to the exchange of massless states. We identify the degenerations of the genus-two Riemann surface which are responsible for power-like dependence on $Λ$, and give an explicit prescription for extracting the $Λ$-independent effective couplings. These renormalized couplings are then shown to be eigenmodes of the Laplace operator with respect to the torus moduli, up to computable anomalous source terms arising in the presence of logarithmic divergences, in precise agreement with predictions from U-duality. Our results for the two-loop $D^6 R^4$ contribution also probe essential properties of the Kawazumi-Zhang invariant

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