Bondal's conjecture on degeneracy loci of Fano Poisson manifolds

Let (X,π)(X,\pi) be a Fano Poisson complex manifold of rank rr. Its degeneracy loci are

D2k(π)={xXπk+1(x)=0}.D_{2k}(\pi)=\{x\in X\mid \pi^{k+1}(x)=0\}.

Bondal's conjecture. For every k{0,1,,r1}k\in\{0,1,\dots,r-1\}, D2k(π)D_{2k}(\pi) has an irreducible component of dimension at least 2k+12k+1.

The conjecture concerns the dimensions of the Poisson degeneracy loci and their role in stratifying a Fano Poisson manifold. This case was settled in the cited work of Polischuk.

Sources & referencesView supporting material

Primary source

Darío Aza, “A note on Bondal's conjecture”, arXiv:2604.07217 (2026).

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