Nonergodicity and Central Limit Behavior for Long-range Hamiltonians

Details Nonergodicity and Central Limit Behavior for Long-range Hamiltonians Nonergodicity and Central Limit Behavior for Long-range Hamiltonians

2007-06-27

arxiv.org/abs/0706.4021v3

Europhysics Letters, 80 (2007) 26002

Physics

Condensed Matter

Statistical Mechanics

6 pages 7 figures. Improved version accepted for publication on Europhysics Letters

Scientific paper

10.1209/0295-5075/80/26002

We present a molecular dynamics test of the Central Limit Theorem (CLT) in a paradigmatic long-range-interacting many-body classical Hamiltonian system, the HMF model. We calculate sums of velocities at equidistant times along deterministic trajectories for different sizes and energy densities. We show that, when the system is in a chaotic regime (specifically, at thermal equilibrium), ergodicity is essentially verified, and the Pdfs of the sums appear to be Gaussians, consistently with the standard CLT. When the system is, instead, only weakly chaotic (specifically, along longstanding metastable Quasi-Stationary States), nonergodicity (i.e., discrepant ensemble and time averages) is observed, and robust $q$-Gaussian attractors emerge, consistently with recently proved generalizations of the CLT.

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