Component correspondence for Grassmann cactus varieties and Hilbert schemes

Let XX be a projective variety and let r,kr,k be positive integers. For a “sufficiently ample” embedding XPVX\subset {\mathbb P}V, consider the Grassmann cactus variety Kr,k(X)\mathfrak{K}_{r,k}(X) and the Hilbert scheme Hilbr(X)\operatorname{Hilb}_r(X) of degree-rr zero-dimensional subschemes of XX. A general element of a Hilbert-scheme component has socle dimension at most kk when its general member does.

Component correspondence conjecture. The irreducible components of Kr,k(X)\mathfrak{K}_{r,k}(X) are in bijection with the irreducible components of Hilbr(X)\operatorname{Hilb}_r(X) whose general element has socle dimension at most kk.

The paper presents this as an effectiveness question and states that precise answers are not yet available; the required meaning of “sufficiently ample” is not specified in the supplied text.

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Primary source

Weronika Buczyńska, Jarosław Buczyński and Maciej Gałązka, “Grassmann cactus variety and socle dimension”, arXiv:2507.21586 (2025).

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