Double Copy for Celestial Amplitudes

Understand

Celestial amplitudes which use conformal primary wavefunctions rather than plane waves as external states offer a novel opportunity to study properties of amplitudes with manifest conformal covariance and give insight into a potential holographic celestial CFT at the null boundary of asymptotically flat space.

• Since translation invariance is obscured in the conformal basis, features of amplitudes that heavily rely on it appear to be lost.
• Among these are the remarkable relations between gauge theory and gravity amplitudes known as the double copy.
• Nevertheless, properties of amplitudes reflecting fundamental aspects of the perturbative regime of quantum field theory are expected to survive a change of basis.