PROGRAM:
14:30 – 15:00 Kaffeepause
15:00 – 15:30 SFB-Vollversammlung
15:30 – 16:30
Prof. Dr. Marcus Spradlin (Brown University)
Cluster algebras and scattering amplitudes
Scattering amplitudes of planar N=4 supersymmetric gauge theory are functions with remarkable mathematical properties. The manifold of kinematic data for an n-particle scattering process is an example of a type of space known as a cluster Poisson variety, and it has been discovered that there is a deep connection between amplitudes and the associated Gr(4,n) Grassmannian cluster algebra. I will review various aspects of this connection and show how exploiting these mathematical properties can greatly aid the computation of previously unknown amplitudes.
16:30 – 17:00 Kaffeepause
17:00 – 18:00
Dr. Congkao Wen (Universita di Roma )
Constraining effective actions via scattering amplitudes
I will discuss how the consistent conditions arising from scattering amplitudes can be utilized for constraining low-energy effective actions. In particular in this talk I will focus on the effective action of N=4 super Yang-Mills theory in the Coulomb branch. The constraints from supersymmetry as well as (broken) conformal symmetry allow us to obtain new non-renormalization theorems. I will also discuss scale invariance v.s. conformal symmetry in this context.