Projective-dual linear-section Hodge conjecture

Let XP(V)\mathsf{X}\subset\mathbb{P}(\mathsf{V}) be a smooth projective variety whose Hodge conjecture is true, and let YP(V)\mathsf{Y}\subset\mathbb{P}(\mathsf{V}^{\ast}) be its projective dual. For a linear subspace LV\mathsf{L}\subset\mathsf{V}^{\ast}, define the linear sections

XL=XP(L),YL=YP(L).\mathsf{X}_{\mathsf{L}}=\mathsf{X}\cap\mathbb{P}(\mathsf{L}^{\perp}),\qquad \mathsf{Y}_{\mathsf{L}}=\mathsf{Y}\cap\mathbb{P}(\mathsf{L}).

Assume that both sections have expected dimension and are smooth. Projective-dual linear-section conjecture. The Hodge conjecture for XL\mathsf{X}_{\mathsf{L}} is equivalent to the Hodge conjecture for YL\mathsf{Y}_{\mathsf{L}}. This predicts a Hodge-theoretic duality for corresponding smooth linear sections of projectively dual varieties, even in situations where homological projective duality is not available; the source presents it as motivated by noncommutative methods and examples.

Sources & referencesView supporting material

Primary source

Xun Lin, “Noncommutative Hodge conjecture”, arXiv:2102.03481 (2021).

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