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(15.12.) Ambitwistor Strings and the Scattering Equations

David Skinner (Cambridge)

15.12.2016 at 16:15 

Scattering amplitudes have a rich hidden structure that is completely obscured by their traditional representation in terms of Feynman diagrams. Recently, Cachazo, He and Yuan have discovered new representations of tree amplitudes for the scattering of any number of particles in a wide variety of massless theories, including Yang-Mills, Gravity and Nonlinear Sigma Models. I'll explain what these CHY representations really mean, showing how they're intimately related to the geometry of the space of null geodesics, known as ambitwistor space. I'll also show how the ambitwistor string has lead to new formulae for loop amplitudes, and discuss generalizations to curved target spaces

Arnold Sommerfeld Center
Theresienstrasse 37
Room 348