Abstract
It is shown that the infinite tower of tree-level plus-helicity soft graviton symmetries in asymptotically flat 4D quantum gravity can be organized into a single chiral 2D Kac-Moody symmetry based on the wedge algebra of , which naturally acts on the celestial sphere at null infinity. The infinite towers of soft photon or gluon symmetries also transform irreducibly under .
- Received 18 August 2021
- Accepted 25 October 2021
DOI:https://doi.org/10.1103/PhysRevLett.127.221601
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Published by the American Physical Society