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Global structure of periodicity hubs in Lyapunov phase diagrams of dissipative flows
Renato Vitolo1, Paul Glendinning, Jason A C Gallas
1School of Engineering, Computing and Mathematics, University of Exeter, Exeter, United Kingdom.
Abstract:
Infinite cascades of periodicity hubs were predicted and very recently observed experimentally to organize stable oscillations of some dissipative flows. Here we describe the global mechanism underlying the genesis and organization of networks of periodicity hubs in control parameter space of a simple prototypical flow, namely a Rössler's oscillator. We show that spirals associated with periodicity hubs emerge and accumulate at the folding of certain fractal-like sheaves of Shilnikov homoclinic bifurcations of a common saddle-focus equilibrium. The specific organization of hub networks is found to depend strongly on the interaction between the homoclinic orbits and the global structure of the underlying attractor.
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