Chaotic saddles and interior crises in a dissipative nontwist system

Author(s)

Simile Baroni, R. ; Egydio de Carvalho, R. ; Caldas, I. L. ; Viana, R. L. ; Morrison, P. J.

• Document type: Journal article
• Source: PHYSICAL REVIEW E; v. 107, n. 2, p. 14-pg., 2023-02-24.

Abstract

We consider a dissipative version of the standard nontwist map. Nontwist systems present a robust transport barrier, called the shearless curve, that becomes the shearless attractor when dissipation is introduced. This attractor can be regular or chaotic depending on the control parameters. Chaotic attractors can undergo sudden and qualitative changes as a parameter is varied. These changes are called crises, and at an interior crisis the attractor suddenly expands. Chaotic saddles are nonattracting chaotic sets that play a fundamental role in the dynamics of nonlinear systems; they are responsible for chaotic transients, fractal basin boundaries, and chaotic scattering, and they mediate interior crises. In this work we discuss the creation of chaotic saddles in a dissipative nontwist system and the interior crises they generate. We show how the presence of two saddles increases the transient times and we analyze the phenomenon of crisis induced intermittency. (AU)

• FAPESP's process: 22/04251-7 - Fractal Structures in Plasma Physics
• Grantee: Iberê Luiz Caldas
• Support Opportunities: Research Grants - Visiting Researcher Grant - Brazil
• FAPESP's process: 19/07329-4 - Analysis of the robustness of the shearless attractor (curve) and the quasi-periodic chaotic transition
• Grantee: Ricardo Egydio de Carvalho
• Support Opportunities: Regular Research Grants