Generic isolation conjecture for Hodge classes on high-dimensional hypersurfaces

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Let VV be the parameter space of smooth hypersurfaces of degree d≥2m+2m−2d\geq 2\frac{{\sf m}+2}{{\sf m}-2} in Pm+1\mathbb{P}^{{\sf m}+1}, with m≥4{\sf m}\geq 4. A Hodge class of YtY_t is called isolated when every component of the Hodge locus in the relevant open set is an orbit of PGL⁡(m+2,C)\operatorname{PGL}({\sf m}+2,\mathbb{C}) acting on VV. Generic isolation conjecture. There is a Zariski open subset U⊂VU\subset V such that the Hodge classes of every YtY_t with t∈Ut\in U are isolated; equivalently, all components of the Hodge locus in UU are the orbits of PGL⁡(m+2,C)\operatorname{PGL}({\sf m}+2,\mathbb{C}) acting on VV. This is presented as a stronger statement than the preceding maximal-rank conjecture and is not resolved in the source.

References

Primary source

Hossein Movasati, “Gauss-Manin connection in disguise: Noether-Lefschetz and Hodge loci”, arXiv:1411.1766 (2016).

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