A new phantom on a rational surface

Abstract

We construct a universal phantom subcategory on the blow-up of the complex projective plane at 11 general points. This phantom subcategory is the orthogonal complement of a non-full exceptional collection of line bundles of maximal length. It provides a new counterexample to a conjecture of Kuznetsov and to a conjecture of Orlov. The first counterexample was constructed by Krah [Invent. Math. {\bf 235} (2024), 1009--1018]. As an application, we construct a new co-connective DG-algebra whose derived category is a phantom. We also show in Appendix B that every smooth projective surface with an effective smooth anti-canonical divisor has no phantom subcategories, e.g. weak del Pezzo surfaces.

17 pages. Revised version with new results added. Comments are very welcome