Compositio Mathematica



A simple characterization of Du Bois singularities


Karl Schwede a1
a1 Department of Mathematics, University of Michigan, Ann Arbor, MI 48109, USA kschwede@umich.edu

Article author query
schwede k   [Google Scholar] 
 

Abstract

We prove the following theorem characterizing Du Bois singularities. Suppose that $Y$ is smooth and that $X$ is a reduced closed subscheme. Let $\pi : \tilde{Y} \rightarrow Y$ be a log resolution of $X$ in $Y$ that is an isomorphism outside of $X$. If $E$ is the reduced pre-image of $X$ in $\tilde{Y}$, then $X$ has Du Bois singularities if and only if the natural map $\mathcal{O}_X \rightarrow R \pi_* \mathcal{O}_E$ is a quasi-isomorphism. We also deduce Kollár's conjecture that log canonical singularities are Du Bois in the special case of a local complete intersection and prove other results related to adjunction.

(Published Online July 17 2007)
(Received October 3 2006)
(Accepted March 3 2007)


Key Words: singularities; rational; log canonical; Du Bois; adjunction; multiplier ideals.

Maths Classification

14B05.


Dedication:
Dedicated to Jozef Steenbrink on the occasion of his 60th birthday