Arithmetic Motivic Poincaré series of toric varieties

Details Arithmetic Motivic Poincaré series of toric varieties Arithmetic Motivic Poincaré series of toric varieties

2010-11-16

arxiv.org/abs/1011.3696v1

Mathematics

Algebraic Geometry

Scientific paper

The arithmetic motivic Poincar\'e series of a variety $V$ defined over a field of characteristic zero, is an invariant of singularities which was introduced by Denef and Loeser by analogy with the Serre-Oesterl\'e series in arithmetic geometry. They proved that this motivic series has a rational form which specializes to the Serre-Oesterl\'e series when $V$ is defined over the integers. This invariant, which is known explicitly for a few classes of singularities, remains quite mysterious. In this paper we study this motivic series when $V$ is an affine toric variety. We obtain a formula for the rational form of this series in terms of the Newton polyhedra of the ideals of sums of combinations associated to the minimal system of generators of the semigroup of the toric variety. In particular, we deduce explicitly a finite set of candidate poles for this invariant.

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