Weighted Hodge ideals of reduced divisors

Abstract

We study the Hodge and weight filtrations on the localization along a hypersurface, using methods from birational geometry and the $V$-filtration induced by a local defining equation. These filtrations give rise to ideal sheaves called weighted Hodge ideals, which include the adjoint ideal and a multiplier ideal. We analyze their local and global properties, from which we deduce applications related to singularities of hypersurfaces of smooth varieties.

arXiv commentv2: improved exposition, fixed typos, added Remark 5.5, to appear in Forum of Mathematics, Sigma