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arXiv 1404.4091hep-th
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一个新的软引力子定理的证据

Evidence for a New Soft Graviton Theorem

Freddy Cachazo, Andrew Strominger

摘要:

利用万有温伯格极点公式,给出了任意量子引力散射振幅的首阶单软引力子极限。该公式的规范不变性来自整体能量动量守恒。本文证明了由整体角动量守恒导出的关于软极限展开式中有限次引导项的一个确定的普适公式。利用BCFW递推关系,对所有的树能级引力子散射振幅证明了该猜想的正确性。人们希望将这种无限的新软关系理解为量子引力S矩阵的新超旋转Virasoro对称性的沃德恒等式。

英文摘要:

The single-soft-graviton limit of any quantum gravity scattering amplitude is given at leading order by the universal Weinberg pole formula. Gauge invariance of the formula follows from global energy-momentum conservation. In this paper evidence is given for a conjectured universal formula for the finite subleading term in the expansion about the soft limit, whose gauge invariance follows from global angular momentum conservation. The conjecture is non-trivially verified for all tree-level graviton scattering amplitudes using a BCFW recursion relation. One hopes to understand this infinity of new soft relations as a Ward identity for a new superrotation Virasoro symmetry of the quantum gravity S-matrix.

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