Partial-tilting extension conjecture for toric vector bundles

Let Σ\Sigma be a complete, simplicial fan such that the toric Deligne–Mumford stack XΣ\mathcal{X}_\Sigma has a partial tilting complex T\mathcal{T} with finite global dimension endomorphism algebra. Let

π:VXΣ\pi:\mathcal{V}\rightarrow X_\Sigma

be a toric vector bundle with fan ΣV\Sigma_\mathcal{V}. Suppose

Hi(XΣ,TTSym(E))=0H^i(\mathcal{X}_\Sigma,\mathcal{T}^\vee\otimes\mathcal{T}\otimes\operatorname{Sym}^\bullet(\mathcal{E}^\vee))=0

for all i0i\neq0. Partial-tilting extension conjecture. There is a partial tilting complex T\mathcal{T}' on XΣV\mathcal{X}_{\Sigma_\mathcal{V}} whose endomorphism algebra has finite global dimension. Consequently, the ring R=k[VM]R=k[|\mathcal{V}|^\vee\cap M] admits an NCCR. The conjecture generalizes the preceding tilting-complex result to partial tilting complexes; the source does not provide evidence of a resolution.

Sources & referencesView supporting material

Primary source

Aimeric Malter and Artan Sheshmani, “Towards non-commutative crepant resolutions of affine toric Gorenstein varieties”, arXiv:2509.11664 (2025).

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