Normal forms for Hopf-Zero singularities with nonconservative nonlinear part

TL;DR

This paper computes the simplest normal forms and orbital normal forms for Hopf-Zero vector fields without a first integral, including parametric forms for perturbations, and discusses their symmetry groups.

Contribution

It introduces a method to compute normal forms for a specific family of Hopf-Zero vector fields without a first integral, expanding understanding of their structure.

Findings

Computed simplest normal forms for Hopf-Zero vector fields without first integral.

Derived parametric normal forms for non-degenerate perturbations.

Analyzed symmetry groups of the normal forms.

Abstract

In this paper we are concerned with the simplest normal form computation of a family of Hopf-zero vector fields without a first integral. This family of vector fields are the classical normal forms of a larger family of vector fields with Hopf-Zero singularity. Indeed, these are defined such that this family would be a Lie subalgebra for the space of all classical normal form vector fields with Hopf-Zero singularity. The simplest normal forms and simplest orbital normal forms of this family with non-zero quadratic part are computed. We also obtain the simplest parametric normal form of any non-degenerate perturbation of this family within the Lie subalgebra. The symmetry group of the simplest normal forms are also discussed. This is a part of our results in decomposing the normal forms of Hopf-Zero singular systems into systems with a first integral and nonconservative systems.