TH String Theory Seminar

# Unity of tree–level superstring amplitudes

## by Stephan Stieberger

Tuesday, 13 May 2014 from to (Europe/Zurich)
at CERN ( 4-3-006 - TH Conference Room )
 Description We review recent results in open and closed superstring tree-level amplitudes and analyze their underlying mathematical structure described by motivic multiple zeta values, Hopf algebra structure, Drinfeld and Deligne associators. We establish a relation between open and closed string amplitudes communicated by the single-valued (sv) projection. This map points into a deeper connection between gauge and gravity amplitudes than what is implied by Kawai-Lewellen-Tye relations. The combination of single-valued projections, Kawai-Lewellen-Tye relations and Mellin correspondence reveal a unity of all tree-level open and closed superstring amplitudes together with the maximally supersymmetric Yang-Mills and supergravity theories. Organised by James Drummond