Dynamics at infinity and a Hopf bifurcation arising in a quadratic system with coexisting attractors

Pramana: Journal of physics

ZHOUCHAO WEI^3¹  ZHEN WANG^1,2²  IRENE MOROZ^3³ 

[1] Mathematical Institute, University of Oxford, Oxford OX2 6GG, UK^3;School of Science, Xijing University, Xi’an 710123, China^1;Shaanxi Key Laboratory of Complex System Control and Intelligent Information Processing, Xi’an University of Technology, Xi’an 710048, China^2

关键词: Infinity dynamics;    Hopf bifurcation;    coexisting attractors;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

Dynamics at infinity and a Hopf bifurcation for a Sprott E system with a very small perturbation constant are studied in this paper. By using Poincaré compactification of polynomial vector fields in $R^{3}$, the dynamics near infinity of the singularities is obtained. Furthermore, in accordance with the centre manifold theorem, the subcritical Hopf bifurcation is analysed and obtained. Numerical simulations demonstrate the correctness of the dynamical and bifurcation analyses. Moreover, by choosing appropriate parameters, this perturbed system can exhibit chaotic,quasiperiodic and periodic dynamics, as well as some coexisting attractors, such as a chaotic attractor coexisting with a periodic attractor for $a > 0$, and a chaotic attractor coexisting with a quasiperiodic attractor for $a = 0$. Coexisting attractors are not associated with an unstable equilibrium and thus often go undiscovered because they may occur in a small region of parameter space, with a small basin of attraction in the space of initial conditions.

【 授权许可】

CC BY