Modified celestial amplitude in Einstein gravity

Understand

In this paper we evaluate the modified celestial amplitude for gravitons and gluons, as defined in arXiv:1801.10171[hep-th].

• We find that the modified (tree) amplitude is finite for gravitons in Einstein gravity.
• The modified amplitude behaves like correlation function of operators inserted at various points of null-infinity in the Minkowski space-time.
• Therefore, unlike the standard celestial amplitudes, these are three dimensional objects.