Evolutionary phase space in driven elliptical billiards

Details Evolutionary phase space in driven elliptical billiards Evolutionary phase space in driven elliptical billiards

2009-04-23

arxiv.org/abs/0904.3636v1

Nonlinear Sciences

Chaotic Dynamics

5 pages, 4 figures

Scientific paper

We perform the first long-time exploration of the classical dynamics of a driven billiard with a four dimensional phase space. With increasing velocity of the ensemble we observe an evolution from a large chaotic sea with stickiness due to regular islands to thin chaotic channels with diffusive motion leading to Fermi acceleration. As a surprising consequence, we encounter a crossover, which is not parameter induced but rather occurs dynamically, from amplitude dependent tunable subdiffusion to universal normal diffusion in momentum space. In the high velocity case we observe particle focusing in phase space.

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