Newton transformations and motivic invariants at infinity of plane curves

In this article we give an expression of the motivic Milnor fiber at infinity and the motivic nearby cycles at infinity of a polynomial \(f\) in two variables with coefficients in an algebraic closed field of characteristic zero. This expression is given in terms of some motives associated to the fa...

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Published in:arXiv.org 2019-10
Main Authors: Cassou-Noguès, Pierrette, Raibaut, Michel
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Language:English
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Algorithms
Bifurcations
Curves
Infinity
Invariants
Polygons
Polynomials
Singularities
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description In this article we give an expression of the motivic Milnor fiber at infinity and the motivic nearby cycles at infinity of a polynomial \(f\) in two variables with coefficients in an algebraic closed field of characteristic zero. This expression is given in terms of some motives associated to the faces of the Newton polygons appearing in the Newton algorithm at infinity of \(f\) without any condition of convenience or non degeneracy. In the complex setting, we compute the Euler characteristic of the generic fiber of \(f\) in terms of the area of the surfaces associated to faces of the Newton polygons. Furthermore, if \(f\) has isolated singularities, we compute similarly the classical invariants at infinity \(\lambda_{c}(f)\) which measures the non equisingularity at infinity of the fibers of \(f\) in \(\mathbb P^2\), and we prove the equality between the topological and the motivic bifurcation sets and give an algorithm to compute them.
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subjects Algorithms
Bifurcations
Curves
Infinity
Invariants
Polygons
Polynomials
Singularities
title Newton transformations and motivic invariants at infinity of plane curves
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