Algebraicity-or-density dichotomy for the Hodge locus

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Let V{\mathbb V} be a polarizable Z\mathbb{Z}-variation of Hodge structures on an irreducible smooth quasi-projective variety SS. Write HL⁡(S,V⊗)\operatorname{HL}(S, {\mathbb V}^{\otimes}) for the Hodge locus and HL⁡(S,V⊗)typ⁡\operatorname{HL}(S, {\mathbb V}^{\otimes})_{\operatorname{typ}} for its typical part.

Algebraicity-or-density conjecture. If HL⁡(S,V⊗)typ⁡\operatorname{HL}(S, {\mathbb V}^{\otimes})_{\operatorname{typ}} is empty, then HL⁡(S,V⊗)\operatorname{HL}(S, {\mathbb V}^{\otimes}) is algebraic; otherwise HL⁡(S,V⊗)\operatorname{HL}(S, {\mathbb V}^{\otimes}) is analytically dense in SS.

The source states this as an immediate consequence of the two preceding conjectures, so it is a restatement of their predicted alternatives rather than an independent assertion. Its resolution status is not supplied.

References

Primary source

Gregorio Baldi, Bruno Klingler and Emmanuel Ullmo, “On the distribution of the Hodge locus”, arXiv:2107.08838 (2023).

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