Abstract
We use the subleading soft-graviton theorem to construct an operator whose insertion in the four-dimensional tree-level quantum gravity matrix obeys the Virasoro-Ward identities of the energy momentum tensor of a two-dimensional conformal field theory (). The celestial sphere at Minkowskian null infinity plays the role of the Euclidean sphere of the , with the Lorentz group acting as the unbroken subgroup.
- Received 16 June 2017
DOI:https://doi.org/10.1103/PhysRevLett.119.121601
© 2017 American Physical Society
Physics Subject Headings (PhySH)
Particles & Fields