Discrepancy formula for derived blow-ups

Assume the setting of the derived blow-up BlZ/X\mathbb{B}l_{Z/X} over SS, with morphism prZ/X:BlZ/XXpr_{Z/X}:\mathbb{B}l_{Z/X}\to X and integer rr as in the main theorem. Let LBlZ/X/SL_{\mathbb{B}l_{Z/X}/S} and LX/SL_{X/S} be the cotangent complexes of BlZ/X\mathbb{B}l_{Z/X} and XX over SS. Discrepancy conjecture. There is an isomorphism

prZ/Xdet(LX/S)det(LBlZ/X/S)OBlZ/X(r1).pr_{Z/X}^{*}\det(L_{X/S})\cong \det(L_{\mathbb{B}l_{Z/X}/S})\otimes \mathcal{O}_{\mathbb{B}l_{Z/X}}(r-1).

This conjecture proposes a relationship between virtual codimension and discrepancy in derived birational geometry. In the stated setting, it is known when S=Spec(C)S=\operatorname{Spec}(\mathbb{C}), XX is a derived scheme, and both ZZ and XX are smooth, as well as when the derived blow-up is smooth; the general case remains open.

Sources & referencesView supporting material

Primary source

Yu Zhao, “A Generalized vanishing theorem for Blow-ups of Quasi-smooth Stacks”, arXiv:2306.09672 (2023).

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