Conformal properties of soft operators: Use of null states
Soft operators are (roughly speaking) zero energy massless particles which live on the celestial sphere in Minkowski space.
In this paper we evaluate the modified celestial amplitude for gravitons and gluons, as defined in . We find that the modified (tree) amplitude is finite for gravitons in Einstein gravity.
Representations of the (Lorentz) conformal group with the soft operators as highest weight vectors have two universal properties, which we clearly state in this paper.
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