The zonotope criterion for generating line bundles on smooth toric varieties

From papers

Let XX be a smooth toric variety, and let ZZ be the zonotope appearing in the source. Suppose the positive-dimensional subvarieties admitting linear inclusions into XX are

Y0=X,Y1,,Yk.Y_0=X,Y_1,\ldots,Y_k.

For divisors D0,,DkD_0,\ldots,D_k on XX, assume that OX(Dj)Z\mathcal O_X(D_j)\in Z and that the corresponding linear inclusions satisfy

HomDbCoh(X)(OYj,OX(Dj))0\operatorname{Hom}_{D^b\operatorname{Coh}(X)}^\bullet(\mathcal O_{Y_j},\mathcal O_X(D_j))\neq 0

for every jj.

Zonotope generation conjecture. Under these assumptions,

j=0k  FFrob(Dj)F\bigoplus_{j=0}^k\;\bigoplus_{\mathcal F\in\operatorname{Frob}(D_j)}\mathcal F

is a classical generator of DbCoh(X)D^b\operatorname{Coh}(X).

The conjecture is intended to imply the preceding Frobenius-generation conjecture: the preceding geometric results reduce possible nonzero-cohomology obstructions to line bundles over vertices of the relevant zonotope, while this statement predicts that the finite collection of Frobenius summands selected by the DjD_j generates.

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Sources & referencesView supporting material

Primary source

Andrew Hanlon, Jeff Hicks and Oleg Lazarev, “Resolutions of toric subvarieties by line bundles and applications”, arXiv:2303.03763 (2024).

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