Matrix factorizations via Koszul duality

In this paper we prove a version of curved Koszul duality for Z/2Z-graded curved coalgebras and their coBar differential graded algebras. A curved version of the homological perturbation lemma is also obtained as a useful technical tool for studying curved (co)algebras and precomplexes. The results of Koszul duality can be applied to study the category of matrix factorizations MF(R,W). We show how Dyckerhoff’s generating results fit into the framework of curved Koszul duality theory. This enables us to clarify the relationship between the Borel-Moore Hochschild homology of curved (co)algebras and the ordinary Hochschild homology of the category MF(R,W). Similar results are also obtained in the orbifold case and in the graded case.

💡 Research Summary

The paper develops a curved Koszul duality theory for Z/2‑graded curved coalgebras and their cobar differential graded algebras, and then applies this machinery to the study of matrix factorization categories MF(R,W). The authors begin by defining a curved coalgebra (C,d,h) where d is a degree‑1 differential, h∈C¹ is a curvature element, and the defining relation d²=