Adjoint ideals along closed subvarieties of higher codimension

Abstract

In this paper, we introduce a notion of adjoint ideal sheaves along closed subvarieties of higher codimension and study its local properties using characteristic $p$ methods. When $X$ is a normal Gorenstein closed subvariety of a smooth complex variety $A$, we formulate a restriction property of the adjoint ideal sheaf $\adj_X(A)$ of $A$ along $X$ involving the l.c.i. ideal sheaf ${\mathcal{D}}_X$ of $X$. The proof relies on a modification of generalized test ideals of Hara and Yoshida.

17 pages; v.2: minor changes, to appear in Crelles Journal