Irreducibility conjecture for Santaló varieties of generic polytopes

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Let A∈R≥0d×nA \in \mathbb{R}^{d \times n}_{\geq 0} be a generic matrix, let C∈CAC \in \mathcal{C}_A be a cell, and let nCn_C denote the number of vertices associated with CC. For u∈CnC+1u \in \mathbb{C}^{n_C+1}, write XC,u\mathscr{X}_{C,u} for the corresponding Santaló variety, and let 1\mathbf{1} be the all-ones vector.

Irreducibility conjecture. For generic matrices A∈R≥0d×nA \in \mathbb{R}^{d \times n}_{\geq 0} and each cell C∈CAC \in \mathcal{C}_A, there exists a dense open subset U⊂CnC+1U \subset \mathbb{C}^{n_C+1} such that XC,u\mathscr{X}_{C,u} is irreducible of dimension dd for u∈Uu \in U. Moreover, 1∈U\mathbf{1} \in U and

XC,1=XC=XC.\mathscr{X}_{C,\mathbf{1}}=\mathcal{X}_C=X_C.

This conjecture would identify the generic parametrized Santaló variety with the varieties obtained from the unweighted and weighted constructions, and supports the degree comparisons used in the paper. No resolution is given in the source.

References

Primary source

Dmitrii Pavlov and Simon Telen, “Santaló Geometry of Convex Polytopes”, arXiv:2402.18955 (2024).

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