Long-Time Correlations in the Stochastic Regime

Details Long-Time Correlations in the Stochastic Regime Long-Time Correlations in the Stochastic Regime

2005-01-11

arxiv.org/abs/nlin/0501023v1

Physica 8D(3), 360-380 (Sept.1983)

Nonlinear Sciences

Chaotic Dynamics

Plain TeX, 30 pages, 8 figures. Reprinted in "Hamiltonian Dynamical Systems", edited by R. S. MacKay and J. D. Meiss (Adam-Hil

Scientific paper

10.1016/0167-2789(83)90232-4

The phase space for Hamiltonians of two degrees of freedom is usually divided into stochastic and integrable components. Even when well into the stochastic regime, integrable orbits may surround small stable regions or islands. The effect of these islands on the correlation function for the stochastic trajectories is examined. Depending on the value of the parameter describing the rotation number for the elliptic fixed point at the center of the island, the long-time correlation function may decay as t^-5 or exponentially, but more commonly it decays much more slowly (roughly as t^-1). As a consequence these small islands may have a profound effect on the properties of the stochastic orbits. In particular, there is evidence that the evolution of a distribution of particles is no longer governed by a diffusion equation.

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