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arXiv 1812.04053hep-th
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双拷贝正螺旋度Einstein-Yang-Mills振幅

Positive helicity Einstein-Yang-Mills amplitudes from the Double Copy

Josua Faller, Jan Plefka

摘要:

利用色运动学对偶性,计算了Einstein-Yang-Mills理论中所有正螺旋度四点胶子-引力子振幅与介子场和轴子场的耦合。特别是,所有相关的贡献,在重力和规范耦合建立。这扩展了以前的广义么正性计算超出了引力耦合$κ$中的主导项。由此产生的纯理性表达式具有非常紧凑的形式。先前在$κ$中看到的单引力子-三胶子振幅在前导级的消失被认为是在$κ^{3}$级被提升。

英文摘要:

All positive helicity four-point gluon-graviton amplitudes in Einstein-Yang-Mills theory coupled to a dilaton and axion field are computed at the leading one-loop order using colour-kinematics duality. In particular, all relevant contributions in the gravitational and gauge coupling are established. This extends a previous generalized unitarity based computation beyond the leading terms in the gravitational coupling $κ$. The resulting purely rational expressions take very compact forms. The previously seen vanishing of the single-graviton-three-gluon amplitude at leading order in $κ$ is seen to be lifted at order $κ^{3}$.

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