Speaker
Gustav Mogull
(University of Edinburgh)
Description
The study of loop-level scattering amplitudes in (super-)Yang-Mills theories has seen enormous progress over the last decade or so.
Unfortunately, many of these developments are limited to the planar limit which consists of only planar Feynman diagrams. Meanwhile, loop-level (super-)gravity amplitudes are difficult to calculate with ordinary Feynman diagrams. In this talk I will introduce Bern, Carrasco & Johansson’s (BCJ’s) colour-kinematics duality. The duality recycles planar tree-level amplitudes into full-colour loop- level amplitudes, while also giving loop-level gravity amplitudes by a double copy. I will also discuss the inclusion of fundamental matter multiplets, and apply these techniques to N=2 supersymmetry with extra hypermultiplets at two loops.
