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arXiv 1004.1349nlin.CDcond-mat.stat-mech
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Chirikov标准映射的Ulam方法

Ulam method for the Chirikov standard map

Klaus M. Frahm, Dima L. Shepelyansky

摘要:

我们引入了一个广义的Ulam方法,并将其应用于辛动力学映射与一个分裂的相空间。基于Arnoldi方法的大量数值研究表明,Perron-Frobenius算子在混沌分量上的Ulam逼近收敛于连续极限.通常,在这种情况下,弛豫模式的频谱的特征在于小的弛豫速率的幂律衰减。我们的数值结果表明,这种衰减的指数近似等于庞加莱递归的指数在这样的系统。本征模显示了与稳定岛周围的轨迹的联系。

英文摘要:

We introduce a generalized Ulam method and apply it to symplectic dynamical maps with a divided phase space. Our extensive numerical studies based on the Arnoldi method show that the Ulam approximant of the Perron-Frobenius operator on a chaotic component converges to a continuous limit. Typically, in this regime the spectrum of relaxation modes is characterized by a power law decay for small relaxation rates. Our numerical data show that the exponent of this decay is approximately equal to the exponent of Poincaré recurrences in such systems. The eigenmodes show links with trajectories sticking around stability islands.

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