On the Number of Isolated Zeros of Pseudo-Abelian Integrals: Degeneracies of the Cuspidal Type

TL;DR

This paper studies the zeros of pseudo-Abelian integrals associated with polynomial functions having cuspidal singularities, providing bounds on their number during certain unfoldings.

Contribution

It establishes uniform bounds on the number of zeros of pseudo-Abelian integrals near cuspidal degeneracies in polynomial systems.

Findings

Bound on the number of zeros of pseudo-Abelian integrals

Analysis of degeneracies of cuspidal type

Unfolding behavior of Darboux first integrals

Abstract

We consider a multivalued function of the form $H\_{\varepsilon}=P\_{\varepsilon}^{\alpha\_0}\prod^{k}\_{i=1}P\_i^{\alpha\_i}, P\_i\in\mathbb{R}[x,y], \alpha\_i\in\mathbb{R}^{\ast}\_+$, which is a Darboux first integral of polynomial one-form $\omega=M\_{\varepsilon}\frac{dH\_{\varepsilon}}{H\_{\varepsilon}}=0, M\_{\varepsilon}=P\_{\varepsilon}\prod^{k}\_{i=1}P\_i$. We assume, for $\varepsilon=0$, that the polycyle $\{H\_0=H=0\}$ has only cuspidal singularity which we assume at the origin and other singularities are saddles. We consider families of Darboux first integrals unfolding $H\_{\varepsilon}$ (and its cuspidal point) and pseudo-Abelian integrals associated to these unfolding. Under some conditions we show the existence of uniform local bound for the number of zeros of these pseudo-Abelian integrals.