Algebraic and Enumerative Combinatorics - Karen Yeats

Title: Chord diagrams, triangulations, and $\phi^p$ amplitudes.

There will be a pre-seminar presenting relevant background at the beginning graduate level starting at 1pm.

Abstract: I will discuss some combinatorics of non-crossing chord diagrams that arose in the context of proving a conjecture from my coauthor's thesis which said that the global Schwinger formula of Cachazo and Early could be decomposed into a sum over cones indexed by non-crossing chord diagrams and that the amplitudes can be read off the chord diagrams by a triangulation construction.

For this talk I will focus on the combinatorics, but will hand wave over the physics at some point between the seminar and the pre-seminar.

Joint work with Bruno Giménez Umbert.