String Theory seminar - Stephan Stieberger Seminar

Amplitude relations in field and string theory are not only of practical use to simplify computations but also shed light on their underlying quantum structure. As a consequence such relations very often allow to reveal hidden symmetries and give rise to new ideas and concepts of reformulating the original theory. We will exhibit relations between gauge and gravity amplitudes in field and string theory, which point into a deeper connection between gauge and gravity amplitudes. Furthermore, the properties of scattering amplitudes in both gauge and gravity theories suggest a deeper understanding from string theory. Studying the geometric properties of the string world–sheet proves to be very fruitful for a better understanding of the structure and symmetries of amplitudes. In particular, monodromy properties of the string world–sheet provide interesting mathematical identities and physical constraints. In this talk we shall elucidate some of these relations, connections and symmetries.