An algorithm for Hodge ideals

Abstract

We present an algorithm to compute the Hodge ideals of $\mathbb{Q}$-divisors associated to any reduced effective divisor $D$. The computation of the Hodge ideals is based on an algorithm to compute parts of the $V$-filtration of Malgrange and Kashiwara on ${\iota }_{+}{\mathcal{O}}_X(\ast D)$ and the characterization of the Hodge ideals in terms of this $V$-filtration. In particular, this gives a new algorithm to compute the multiplier ideals and the jumping numbers of any effective divisor.

arXiv comment13 pages. Corrected a minor issue in the published version: for certain examples, the output of the algorithm is returned shifted