Generating series for closed string scattering at genus one

Abstract: The low-energy limit of closed string scattering amplitudes has recently received an increased amount of attention due to new connections to number theory and automorphic forms that I will explain in this talk. The low-energy expansion for n-point scattering can be formulated in terms of objects called modular graph forms. Writing down these forms is easy but analysing them less so since they satisfy an intricate web of surprising relations. I will discuss recent progress on systematising their properties based on generating function techniques and comment on a relation between open and closed string scattering. The talk is mainly based on 1911.03476 and 2004.05156.

general relativity and quantum cosmologyHEP - theoryquantum physics

Audience: researchers in the topic

( video )

Quantum Aspects of Space-Time and Matter