Discreteness and rationality of $F$-jumping numbers on singular varieties

Details Discreteness and rationality of $F$-jumping numbers on singular varieties Discreteness and rationality of $F$-jumping numbers on singular varieties

2009-06-25

arxiv.org/abs/0906.4679v2

Mathematische Annalen, Volume 347, Number 4, 917-949, 2010

Mathematics

Algebraic Geometry

29 pages, minor changes, to appear in Mathematische Annalen

Scientific paper

10.1007/s00208-009-0461-2

We prove that the $F$-jumping numbers of the test ideal $\tau(X; \Delta, \ba^t)$ are discrete and rational under the assumptions that $X$ is a normal and $F$-finite variety over a field of positive characteristic $p$, $K_X+\Delta$ is $\bQ$-Cartier of index not divisible $p$, and either $X$ is essentially of finite type over a field or the sheaf of ideals $\ba$ is locally principal. This is the largest generality for which discreteness and rationality are known for the jumping numbers of multiplier ideals in characteristic zero.

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