Bifurcation values for a family of planar vector fields of degree five - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Discrete and Continuous Dynamical Systems - Series A Année : 2015

Bifurcation values for a family of planar vector fields of degree five

Résumé

We study the number of limit cycles and the bifurcation diagram in the Poincaré sphere of a one-parameter family of planar differential equations of degree five x˙=Xb(x) which has been already considered in previous papers. We prove that there is a value b∗>0 such that the limit cycle exists only when b∈(0,b∗) and that it is unique and hyperbolic by using a rational Dulac function. Moreover we provide an interval of length 27/1000 where b∗ lies. As far as we know the tools used to determine this interval are new and are based on the construction of algebraic curves without contact for the flow of the differential equation. These curves are obtained using analytic information about the separatrices of the infinite critical points of the vector field. To prove that the Bendixson--Dulac Theorem works we develop a method for studying whether one-parameter families of polynomials in two variables do not vanish based on the computation of the so called double discriminant.

Dates et versions

hal-01170574 , version 1 (01-07-2015)

Identifiants

Citer

Garcia-Saldana Johanna, Gasull Armengol, Hector Giacomini. Bifurcation values for a family of planar vector fields of degree five. Discrete and Continuous Dynamical Systems - Series A, 2015, 35 (2), pp.669-701. ⟨10.3934/dcds.2015.35.669⟩. ⟨hal-01170574⟩
84 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More