Integrals of motion and the shape of the attractor for the Lorenz model. (English) Zbl 0962.37501
Summary: We consider three-dimensional dynamical systems, as for example the Lorenz model. For these systems, we introduce a method for obtaining families of two-dimensional surfaces such that trajectories cross each surface of the family in the same direction. To obtain these surfaces, we are guided by the integrals of motion that exist for particular values of the parameters of the system. Nonetheless families of surfaces are obtained for arbitrary values of these parameters. Only a bounded region of the phase space is not filled by these surfaces. The global attractor of the system must be contained in this region. In this way, we obtain information on the shape and location of the global attractor. These results are more restrictive than similar bounds that have been recently found by the method of Lyapunov functions.
MSC:
| 37C40 | Smooth ergodic theory, invariant measures for smooth dynamical systems |
| 34C05 | Topological structure of integral curves, singular points, limit cycles of ordinary differential equations |
| 34D45 | Attractors of solutions to ordinary differential equations |
| 37C10 | Dynamics induced by flows and semiflows |
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