Algebraicity-or-density dichotomy for the Hodge locus

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.

Sources & referencesView supporting material

Primary source

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

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