Kinematic StratificationsConfirmed

by Bernd Strumfels (Max Planck Institute for Mathematics in the Sciences)

Wednesday May 28, 2025, 2:00 p.m. → 3:30 p.m. America/Toronto

PI/2-292 - Time Room (Perimeter Institute for Theoretical Physics)

This lecture discusses the stratification of regions in the space of real symmetric matrices. The points of these regions are Mandelstam matrices for momentum vectors in particle physics. The kinematic strata are indexed by signs and rank two matroids. Matroid strata of Lorentzian polynomials arise when all signs are nonnegative. We describe the posets of strata, for massless and massive particles, with and without momentum conservation. This is joint work with Veronica Calvo and Hadleigh Frost.