Kapec, DanielLysov, VyacheslavPasterski, SabrinaStrominger, Andrew2017-10-302014Kapec, Daniel, Vyacheslav Lysov, Sabrina Pasterski, and Andrew Strominger. 2014. “Semiclassical Virasoro Symmetry of the Quantum Gravity S-Matrix.” J. High Energ. Phys. 2014 (8) (August). doi:10.1007/jhep08(2014)058.1029-8479http://nrs.harvard.edu/urn-3:HUL.InstRepos:34309451It is shown that the tree-level S-matrix for quantum gravity in four-dimensional Minkowski space has a Virasoro symmetry which acts on the conformal sphere at null infinity.en-USJournal Article2015-08-13Kapec, Daniel, Lysov, Vyacheslav, Pasterski, Sabrina, Strominger, Andrew2017-10-3010.1007/jhep08(2014)058