Log canonical thresholds on varieties with bounded singularities

Abstract

We consider pairs (X,A), where X is a variety with klt singularities and A is a formal product of ideals on X with exponents in a fixed set that satisfies the Descending Chain Condition. We also assume that X has (formally) bounded singularities, in the sense that it is, formally locally, a subvariety in a fixed affine space defined by equations of bounded degree. We prove in this context a conjecture of Shokurov, predicting that the set of log canonical thresholds for such pairs satisfies the Ascending Chain Condition.

38 pages; v.2: minor changes, to appear in the proceedings of the conference `Classification of algebraic varieties' at Schiermonnikoog