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arXiv 1802.03148hep-th
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规范对称性的无穷软定理

Infinite Soft Theorems from Gauge Symmetry

Zhi-Zhong Li, Hung-Hwa Lin, Shun-Qing Zhang

摘要:

在这封信中,我们表明,光子和引力子振幅的软行为,投影后,可以确定无限的软膨胀通过普通的壳规范不变性。特别是,当一个粒子的动量变软时,规范不变性将n点振幅的非奇异图与奇异图联系起来,直到可能的齐次项。我们证明,与一个特定的投影的软限制,齐次项不作出贡献,并在一个无限软定理到达。这再现了最近从大规范变换的沃德恒等式导出的结果。我们还讨论了修改这些软定理,由于高维运营商的存在。

英文摘要:

In this letter we show that the soft behaviour of photons and graviton amplitudes, after projection, can be determined to infinite order in soft expansion via ordinary on-shell gauge invariance. In particular, as one of the particle's momenta becomes soft, gauge invariance relates the non-singular diagrams of an n-point amplitude to that of the singular ones up to possible homogeneous terms. We demonstrate that with a particular projection of the soft-limit, the homogeneous terms do not contribute, and one arrives at an infinite soft theorem. This reproduces the result recently derived from the Ward identity of large gauge transformations. We also discuss the modification of these soft theorems due to the presence of higher-dimensional operators.

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