Evidence for a New Soft Graviton Theorem
Abstract
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.
Cite
@article{arxiv.1404.4091,
title = {Evidence for a New Soft Graviton Theorem},
author = {Freddy Cachazo and Andrew Strominger},
journal= {arXiv preprint arXiv:1404.4091},
year = {2014}
}
Comments
21 pages, normalization of J changed to the standard one and references added in v2