A characteristic p analogue of plt singularities and adjoint ideals

Details A characteristic p analogue of plt singularities and adjoint ideals A characteristic p analogue of plt singularities and adjoint ideals

2006-03-20

arxiv.org/abs/math/0603460v2

Mathematics

Algebraic Geometry

22 pages. A lot of changes. Some errors and many typos fixed

Scientific paper

We introduce a new variant of tight closure and give an interpretation of adjoint ideals via this tight closure. As a corollary, we prove that a log pair $(X,\Delta)$ is plt if and only if the modulo $p$ reduction of $(X,\Delta)$ is divisorially F-regular for all large $p \gg 0$. Here, divisorially F-regular pairs are a class of singularities in positive characteristic introduced by Hara and Watanabe in terms of Frobenius splitting.

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