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math.AG2024
Spinor-Helicity Varieties
Yassine El Maazouz, Anaëlle Pfister, Bernd Sturmfels
The spinor-helicity formalism in particle physics gives rise to natural subvarieties in the product of two Grassmannians. These include two-step flag varieties for subspaces of com…
math.AG2024
Minimal Kinematics on
Nick Early, Anaëlle Pfister, Bernd Sturmfels
Minimal kinematics identifies likelihood degenerations where the critical points are given by rational formulas. These rest on the Horn uniformization of Kapranov-Huh. We character…