Speaker
Walker Melton
Description
Gauge and gravity amplitudes have near-universal behavior in the limit where gravitons or gluons have low energies. In celestial CFT, these universal soft algebras imply the existence of higher-spin current algebras. After discussing the origins of these celestial soft algebras from collinear limits of successive soft insertions, I will describe how gauge soft algebra of Yang-Mills is extended when coupled to neutral complex scalars. Central extensions of the soft algebra for Yang-Mills are generated by expanding around sourced scalar backgrounds.
