# Theoretical High Energy Seminar

## Arkady Tseytlin (Imperial College)

### S-matrix of Pohlmeyer reduced form of AdS_5 x S^5 superstring theory

### Abstract:

With a motivation to find a 2-d Lorentz-invariant solution of the AdS_5 x S^5 superstring we shall consider the Pohlmeyer-reduced form of this theory. The reduced theory is constructed from currents of the superstring sigma model and is classically equivalent to it. Its action is that of Sp(2,2)xSp(4)/SU(2)^4 gauged WZW model deformed by an integrable potential and coupled to fermions. This theory is UV finite and is conjectured to be related to the superstring theory also at the quantum level. Since the theory is integrable, its S-matrix should be effectively determined by the two-particle scattering. We compute the tree-level two-particle S-matrix for the elementary excitations of the reduced theory and find that this S-matrix has the same index structure and group factorization properties as the superstring S-matrix. We discuss possible relation between the two S-matrices.

### Details

Date: Tuesday, 9/2/10

Time: 14:15

Place: Auditorium A, Blegdamsvej 17, 2100, Copenhagen