Derived categories of Keum's fake projective planes

Abstract

We conjecture that derived categories of coherent sheaves on fake projective $n$-spaces have a semi-orthogonal decomposition into a collection of exceptional objects and a category with vanishing Hochschild homology. We prove this for fake projective planes with non-abelian automorphism group (such as Keum’s surface). Then by passing to equivariant categories we construct new examples of phantom categories with both Hochschild homology and Grothendieck group vanishing.

Type
Publication