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arXiv 1404.0147math.DS
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环面上部分扩张映射的猝灭随机扰动谱

On the spectra of quenched random perturbations of partially expanding maps on the torus

Yushi Nakano, Jens Wittsten

摘要:

考虑单位圆上一致扩张映射上单位圆上旋转斜积的猝灭随机扰动。已知如果斜积满足一定的条件(在线性扩张映射的情况下是通用的),则斜积的转移算子具有谱间隙。利用半经典分析,我们表明,在小的随机扰动下的频谱间隙被保存。这意味着在小噪声水平下,平滑观测量的猝灭随机相关函数的指数衰减。

英文摘要:

We consider quenched random perturbations of skew products of rotations on the unit circle over uniformly expanding maps on the unit circle. It is known that if the skew product satisfies a certain condition (shown to be generic in the case of linear expanding maps), then the transfer operator of the skew product has a spectral gap. Using semiclassical analysis we show that the spectral gap is preserved under small random perturbations. This implies exponential decay of quenched random correlation functions for smooth observables at small noise levels.

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