Subleading Soft Theorem for Multiple Soft Gravitons
arXiv:1707.06803 · doi:10.1007/JHEP12(2017)150
Abstract
We derive the subleading soft graviton theorem in a generic quantum theory of gravity for arbitrary number of soft external gravitons and arbitrary number of finite energy external states carrying arbitrary mass and spin. Our results are valid to all orders in perturbation theory when the number of non-compact space-time dimensions is six or more, but only for tree amplitudes for five or less non-compact space-time dimensions due to enhanced contribution to loop amplitudes from the infrared region.
LaTeX, 47 pages, 13 figures; v2: expanded the section on infrared issues, updated the section on comparison with known results
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