Apparent fractal dimensions in the HMF model

Details Apparent fractal dimensions in the HMF model Apparent fractal dimensions in the HMF model

2004-07-14

arxiv.org/abs/cond-mat/0407357v1

Physics

Condensed Matter

Statistical Mechanics

Proceedings of the Vlasovia Workshop, Nancy, 26-28 November 2003. to be published on Transport Theory and Statistical Mechanic

Scientific paper

10.1080/00411450500274766

We show that recent observations of fractal dimensions in the $\mu$-space of $N$-body Hamiltonian systems with long-range interactions are due to finite $N$ and finite resolution effects. We provide strong numerical evidence that, in the continuum (Vlasov) limit, a set which initially is not a fractal (e.g. a line in 2D) remains such for all finite times. We perform this analysis for the Hamiltonian Mean Field (HMF) model, which describes the motion of a system of $N$ fully coupled rotors. The analysis can be indirectly confirmed by studying the evolution of a large set of initial points for the Chirikov standard map.

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