Speaker: Waltraut Knop

Title: Bootstrapping Supergraviton Amplitudes

Abstract: In this talk we will bound the space of tree-level, 2→2 graviton amplitudes in ten dimensions with both maximal and half-maximal supersymmetry. Using numerical S-matrix bootstrap techniques, in which we impose only basic consistency conditions such as unitarity, causality, and crossing, we study the bounds on effective field theory coefficients in both setups. We show how closed and heterotic string theories arise as consistent UV completions within their respective bounds. Employing mild spectral assumptions, we find that the extremal amplitudes, i.e. those on the boundary of the allowed region, are given by families of single Regge trajectory amplitudes. This suggests that UV completions of supergravity must exhibit (at least some) stringy features.