HET-Discovery seminar: Carlos Mafra – University of Copenhagen

HET-Discovery seminar: Carlos Mafra

Speaker: Carlos Mafra

Title: The superstring n-point 1-loop amplitude

Abstract:  In 2011, the superstring n-point amplitudes at tree level
have been explicitly computed using the pure spinor formalism.
In this talk I will discuss the recent work on extending these
calculations to one loop.

Several very interesting patterns emerge in this quest. One of them
is a general Lie-polynomial structure of superstring correlators
(also conjectured to hold at higher genus). There is also a double-copy
structure between kinematic factors in pure spinor superspace and
generalized elliptic integrands.
Their construction in terms of objects satisfying shuffle-symmetries
may suggest an underlying combinatoric explanation.