PIRSA:25050021 Scientific Series Other

DOI10.48660/25050021

Series: Colloquium

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

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

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

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.

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