Factorization conjecture for LS discriminants of rational Landau diagrams

Let L\mathcal{L} be a rational Landau diagram, and let VGV_G be the associated variety with irreducible components VG,σV_{G,\sigma}. Let ΔL\Delta_{\mathcal{L}} denote its LS discriminant, and let ΔL,mix\Delta_{\mathcal{L},\mathrm{mix}} denote the mixed LS discriminant. Factorization conjecture. On each irreducible component of VGV_G, the LS discriminant has the form given in equation

,andthemixedLSdiscriminanthastheanalogousformgiveninequation, and the mixed LS discriminant has the analogous form given in equation

, with both products ranging over all external colorings admissible for L\mathcal{L}. This is presented as a generalization of the triangle case; the source gives no resolution.

Sources & referencesView supporting material

Primary source

Benjamin Hollering, Elia Mazzucchelli, Matteo Parisi and Bernd Sturmfels, “Landau Analysis in the Grassmannian”, arXiv:2603.25454 (2026).

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