Cyclic covers via mixed Hodge modules

Abstract

Suppose we are given an arbitrary line bundle $\mathcal{L}$ on a complex algebraic variety $X$, not necessarily smooth. For a positive integer $N$, suppose there exists a global section $s\in \Gamma (X,{\mathcal{L}}^N)$ that defines an effective Cartier divisor $D$. If we denote $\pi :Y\to X$ to be the $N$-fold cyclic covering of the divisor $D$ resulting from the global section $s$, we describe the cyclic covering in terms of Morihiko Saito's theory of mixed Hodge modules.

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