André–Oort conjecture for meromorphic strata in genus zero

Let H(μ)\mathcal H(\mu) be a stratum of meromorphic differentials in genus zero, and let SH(μ)S\subseteq\mathcal H(\mu) be an algebraic variety containing a Zariski-dense set of arithmetic points, where an arithmetic point is a Q\overline{\mathbb Q}-bi-algebraic point. The residue map assigns to a differential its residues at the marked poles.

André–Oort conjecture in genus zero. The variety SS is Q\overline{\mathbb Q}-bi-algebraic. Furthermore, if not all residues are identically zero on SS, then the fibers of the residue map are affine-linear bi-algebraic varieties.

This is the genus-zero analogue of the André–Oort conjecture for holomorphic strata, adapted to account for residues in meromorphic strata. The source does not state a resolution of this conjecture.

Sources & referencesView supporting material

Primary source

Frederik Benirschke, “Bi-algebraic geometry of strata of differentials in genus zero”, arXiv:2310.07523 (2023).

Additional references

2 papers in this index state this conjecture (2022–2023). The statement above is taken from the most recent of them; the others are arXiv:2202.06031.

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