A maximally-graded invertible cubic threefold that does not admit a full exceptional collection of line bundles

preprint2020arXivOpen access

Abstract

We show that there exists a cubic threefold defined by an invertible polynomial that, when quotiented by the maximal diagonal symmetry group, has a derived category which does not have a full exceptional collection consisting of line bundles. This provides a counterexample to a conjecture of Lekili and Ueda.

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