Abstract
What physical quantity can we use to capture and describe the multitude of invariant sets and the local structure of unstable manifolds W u that determine the form and structure of chaos? By introducing the expansion rate of neighboring orbits, which expresses the stretching and folding of segments of W u, and the local dimension, which describes the self-similarity of the nested structure of strange attractors, the geometric and statistical descriptions given in terms of chaotic orbits through the fluctuations of these quantities can be unified. We show that the chaotic bifurcations and tangency structure of unstable manifolds can be directly understood in terms of the spectrum ψ(Λ), and also that a fixed relationship exists between the spectra of this expansion rate and the local dimension.
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The statistical thermodynamics formalism of dynamical systems discussed in this chapter was first introduced from a mathematical point of view. To understand the motivation behind the development of this formal- ism, see, for example, Takahashi (1980) and Ellis (1985). The concrete treatment given in this chapter of the multifractal dimension D(q), the two spectra f(α) and ψ(Λ), and related quantities for physical dynamical systems follows the theoretical work contained in Halsey. (1986), Morita. (1988), and Grassberger. (1988), and the line of reasoning presented in Mori. (1989a), in which a number of subjects are treated in a unified manner. The attempt to unify the geometrical and statistical descriptions of chaos presented in this chapter has its origin in the papers by Horita. (1988a), Hata. (1988), Tomita. (1988), and Mori. (1989b), which seek a statistical characterization of the bifurcations arising from fluctuations in the coarse-grained expansion rate of orbits, and the paper Horita. (1988b), which deals with the theory regarding the slope sß resulting from collision with a saddle.
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Mori, H., Kuramoto, Y. (1998). The Statistical Physics of Aperiodic Motion. In: Dissipative Structures and Chaos. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-80376-5_11
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DOI: https://doi.org/10.1007/978-3-642-80376-5_11
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