Zeta Functions and ‘Kontsevich Invariants’ on Singular Varieties

Veys, Willem

Canadian journal of mathematics, Tome 53 (2001) no. 4, pp. 834-865

Résumé

Let $X$ be a nonsingular algebraic variety in characteristic zero. To an effective divisor on $X$ Kontsevich has associated a certain motivic integral, living in a completion of the Grothendieck ring of algebraic varieties. He used this invariant to show that birational (smooth, projective) Calabi-Yau varieties have the same Hodge numbers. Then Denef and Loeser introduced the invariant motivic (Igusa) zeta function, associated to a regular function on $X$ , which specializes to both the classical $p$ -adic Igusa zeta function and the topological zeta function, and also to Kontsevich's invariant.This paper treats a generalization to singular varieties. Batyrev already considered such a ‘Kontsevich invariant’ for log terminal varieties (on the level of Hodge polynomials of varieties instead of in the Grothendieck ring), and previously we introduced a motivic zeta function on normal surface germs. Here on any $\mathbb{Q}$ -Gorenstein variety $X$ we associate a motivic zeta function and a ‘Kontsevich invariant’ to effective $\mathbb{Q}$ -Cartier divisors on $X$ whose support contains the singular locus of $X$ .

Détail

DOI : 10.4153/CJM-2001-034-1

Mots-clés : 14B05, 14E15, 32S50, 32S45, singularity invariant, topological zeta function, motivic zeta function

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