Speaker
Dr
Freddy Cachazo
(Perimeter Institute)
Description
In 2003 Witten showed that the leading order of scattering amplitudes in the maximally supersymmetric gauge theory (MSYM) in four dimensions can be computed using a string-like formulation. Amplitudes are correlation functions computed on a punctured Riemann sphere. For many years this phenomenon was thought to be special to MSYM. In 2013, an explosion of string-like formulations were discovered which are now known as CHY formulas. In this talk I will explain the CHY formulation and how it provides a unified description of the S-matrix of theories such as Einstein gravity, Yang-Mills, Dirac-Born-Infeld, the non-linear sigma model and Galileons.
Author
Dr
Freddy Cachazo
(Perimeter Institute)
