IJCsatellite IJCsatellite/cond-mat

cond-mat/0506261 http://arxiv.org/abs/cond-mat/0506261

From: Hidetoshi Morita [view email]
Date: Sat, 11 Jun 2005 13:33:08 GMT   (169kb)

Collective motion in a Hamiltonian dynamical system

Authors: Hidetoshi Morita, Kunihiko Kaneko
Comments: 4 pages, 5 figures
Subj-class: Statistical Mechanics; Chaotic Dynamics

Oscillation of macroscopic variables is discovered in a metastable state in the Hamiltonian dynamical system of mean field XY model, the duration of which is divergent with the system size. This long-lasting periodic or quasiperiodic collective motion appears through Hopf bifurcation, which is a typical route in low-dimensional dissipative dynamical systems. The origin of the oscillation is explained, with self-consistent analysis of the distribution function, as the emergence of self-excited ``swings'' through the mean-field. The universality of the phenomena is also discussed.


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