The total spine of the Milnor fibration of a plane curve singularity

Pablo Portilla Cuadrado; Baldur Sigurðsson

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arXiv · 2305.12555

The total spine of the Milnor fibration of a plane curve singularity

Pablo Portilla Cuadrado·Baldur Sigurðsson

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Abstract

For any plane curve singularity defined by an analytic function germ $f$, we construct a spine on each Milnor fiber simultaneously, that realizes the vanishing topology. In order to do so, we study the separatrices at the origin of the vector field $-\nabla \log |f|$. Under some genericity conditions on the metric, we produce a natural partition of the set of separatrices, $S$, into a finite collection smooth strata. As a byproduct of this theory, we construct a smooth fibration which is equivalent to the Milnor fibration, and lives on a quotient of the Milnor fibration at radius $0$. The strict transform of $S$ in this space induces the aforementioned spine for each fiber of this fibration. These fibers are naturally endowed with a vector field in such a way that the spine consists of trajectories which do not escape through the boundary.

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Pablo Portilla Cuadrado, Baldur Sigurðsson. 2023-05-21. The total spine of the Milnor fibration of a plane curve singularity. https://arxiv.org/abs/2305.12555

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