# Theoretical High Energy Seminar

## Oliver Schlotterer (MPI Munich)

### Gauge multiplet tree amplitudes in pure spinor superspace

### Abstract:

The pure spinor formalism is an alternative formulation of superstring theory which -- unlike the Ramond Neveu-Schwarz- and Green Schwarz frameworks -- maintains manifest Super Poincare symmetry in all steps of scattering calculations. I will first of all present basics of the pure spinor formalism, identify its worldsheet degrees of freedom and explain the prescription towards superstring tree level amplitudes of the ten dimensional N=1 SYM multiplet in pure spinor superspace. Then, I will present the superstring amplitudes up to 6pt (arXiv:1011.0994) in an organization scheme based on BRST cohomology which admits a dictionary between Feynman diagrams and superspace expressions. Using these BRST building blocks, we could find the n-point generalization of the field theory amplitude which exhibits a recursive structure in the spirit of BCFW (arXiv:1012.3981).

### Details

Date: Tuesday, 11/1/11

Time: 14:15

Place: Auditorium A, Blegdamsvej 17, 2100, Copenhagen