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arXiv 1306.6851hep-th
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$α'^3$阶S-对偶不变重子耦合

S-duality invariant dilaton couplings at order $α'^3$

Mohammad R. Garousi

摘要:

给出了在八阶导数水平下对II型超引力的黎曼曲率修正的树级示意图$(t_8t_8+{1}{8}\eps_{10}\eps_{10})R^4$。Gross和Sloan提出的在$t_8t_8R^4$中替换广义Riemann曲率,产生了各种在T-对偶下不变的NS-NS耦合。最近,利用S-对偶变换和T-对偶变换的组合,我们找到了在S-对偶变换下不变的一类耦合。本文用超弦理论中的四个NS-NS顶点算符的直接散射振幅计算考察了包含介子的耦合,发现了精确的一致性。耦合$\eps_{10}\eps_{10}R^4$是四场水平的全导数项。$σ$模型β函数方法意味着在树级存在该项。通过对五个引力子的球能级散射振幅的研究,我们也证实了在树能级有效作用量中存在这一项。

英文摘要:

The Riemann curvature correction to the type II supergravity at eight-derivative level is given schematically as $(t_8t_8+{1}{8}\eps_{10}\eps_{10})R^4$ at tree-level. The replacement of the generalized Riemann curvature in $t_8t_8R^4$, proposed by Gross and Sloan, produces various NS-NS couplings which are invariant under T-duality. Recently, using the combination of S-duality and T-duality transformations on these couplings, we have found groups of couplings which are invariant under the S-duality transformation. In this paper, we have examined the couplings involving the dilaton with direct scattering amplitude calculations of four NS-NS vertex operators in the superstring theory and found exact agreement. The coupling $\eps_{10}\eps_{10}R^4$ is a total derivative term at four-field level. The $σ$-model beta function approach implies the presence of this term at the tree-level. By examining the sphere-level scattering amplitude of five gravitons, we have also confirmed the presence of this term in the tree-level effective action.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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