PIRSA:25050021

Video URL

https://pirsa.org/25050021

Kinematic Stratifications

Strumfels, B. (2025). Kinematic Stratifications. Perimeter Institute for Theoretical Physics. https://pirsa.org/25050021

Strumfels, Bernd. Kinematic Stratifications. Perimeter Institute for Theoretical Physics, May. 28, 2025, https://pirsa.org/25050021 

          @misc{ scivideos_PIRSA:25050021,
            doi = {10.48660/25050021},
            url = {https://pirsa.org/25050021},
            author = {Strumfels, Bernd},
            keywords = {Other Physics},
            language = {en},
            title = {Kinematic Stratifications},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2025},
            month = {may},
            note = {PIRSA:25050021 see, \url{https://scivideos.org/pirsa/25050021}}
          }

Bernd Strumfels Max Planck Institute for Mathematics in the Sciences

Talk numberPIRSA:25050021
DOI10.48660/25050021
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

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.