Irreducibility conjecture for Santaló varieties of generic polytopes

From papers

Let AR0d×nA \in \mathbb{R}^{d \times n}_{\geq 0} be a generic matrix, let CCAC \in \mathcal{C}_A be a cell, and let nCn_C denote the number of vertices associated with CC. For uCnC+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 AR0d×nA \in \mathbb{R}^{d \times n}_{\geq 0} and each cell CCAC \in \mathcal{C}_A, there exists a dense open subset UCnC+1U \subset \mathbb{C}^{n_C+1} such that XC,u\mathscr{X}_{C,u} is irreducible of dimension dd for uUu \in U. Moreover, 1U\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.

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Sources & referencesView supporting material

Primary source

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

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