Global critical chart for local Calabi-Yau threefolds

Abstract

In this paper, we investigate Keller's deformed Calabi--Yau completion of the derived category of coherent sheaves on a smooth variety. In particular, for an $n$-dimensional smooth variety $Y$, we describe the derived category of the total space of an ${\omega }_Y$-torsor as a certain deformed $(n+1)$-Calabi--Yau completion of the derived category of $Y$. As an application, we investigate the geometry of the derived moduli stack of compactly supported coherent sheaves on a local curve, i.e., a Calabi--Yau threefold of the form ${\mathrm{Tot}}_C(N)$, where $C$ is a smooth projective curve and $N$ is a rank two vector bundle on $C$. We show that the derived moduli stack is equivalent to the derived critical locus of a function on a certain smooth moduli space. This result will be used by the first author and Naoki Koseki in their joint work on Higgs bundles and Gopakumar--Vafa invariants.

22 pages. v2:Added Section 1.5 and some references

References in corpus (2)

• Dimensional reduction in cohomological Donaldson-Thomas theory
• Relative Calabi-Yau structures II: Shifted Lagrangians in the moduli of objects

Cited by in corpus (1)

• Motivic mirror symmetry and $\chi$-independence for Higgs bundles in arbitrary characteristic