Collinear Corrections to the Cachazo-Strominger Soft Theorem

by Sruthi Narayanan (Perimeter Inst. Theor. Phys.)

Wednesday May 7, 2025, 12:30 PM → 2:30 PM America/Los_Angeles

48/2-224 - Madrone (SLAC)

Soft theorems describe the behavior of scattering amplitudes when one or several external particles are taken to be energetically soft. In this talk I will motivate studying the sub-subleading soft graviton theorem, originally elucidated by Cachazo and Strominger, with a basic discussion of celestial holography and the conserved charges associated with asymptotic symmetries. I will then demonstrate that consistency between the conserved charges and the original amplitudes analysis via a BCFW expansion requires a careful treatment of collinear singularities in the amplitude. 

CachazoStrominger_SLAC.pdf