Pawel Caputa, Niels Bohr Institute
String Scattering and Minimal Surfaces

I will discuss massless open and closed string scattering amplitudes in flat space at high energies. Similarly to the case of AdS space I will demonstrate that, under the $T$-duality map, the open string amplitudes are given by the exponential of minus minimal surface areas whose boundaries are cusped closed loops formed by lightlike momentum vectors. I will then explain how the Douglas boundary functional can be used to study various relations between amplitudes at strong coupling.