Homological Bondal-Orlov localization conjecture for rational singularities

Abstract

Given a resolution of rational singularities $\pi\colon \tilde{X} \to X$ over a field of characteristic zero we use a Hodge-theoretic argument to prove that the image of the functor $\mathbf{R}\pi_*\colon \mathbf{D}(\tilde{X}) \to \mathbf{D}(X)$ between bounded derived categories of coherent sheaves generates $\mathbf{D}(X)$ as a triangulated category. This gives a weak version of the Bondal-Orlov localization conjecture, answering a question of Pavic and Shinder. The same result is established more generally for proper (non-necessarily birational) morphisms $\pi\colon \tilde{X} \to X$, with $\tilde{X}$ smooth, satisfying $\mathbf{R}\pi_*(\mathcal{O}_{\tilde{X}}) = \mathcal{O}_X$.