Mon, May 17, 2021, 2:30 pm

Location:

via Zoom

Speaker(s):

Francis Brown

Oxford University

"Superstring Amplitudes in Genus 0 and Double Copy"

**To connect to the HET Seminar via Zoom, please click the following link:**

https://theias.zoom.us/j/83432499354?pwd=TkhMZWFJK2E1UzRyeUppU01pZVQwUT09**Abstract:** This is joint work with Clément Dupont. Motivated by double-copy (Kawai-Lewellen-Tye) formulae relating open and closed superstring amplitudes at tree-level, I will explain a general double-copy formula for period integrals on algebraic varieties and its relation to single-valued functions. As an application, we deduce a conjecture of Stieberger which states that the passage from open to closed amplitudes in string perturbation theory at genus zero is given by the so-called single-valued map.