开部分扩张映射Ruelle共振的渐近谱隙和Weyl定律
Asymptotic spectral gap and Weyl law for Ruelle resonances of open partially expanding maps
摘要：
我们考虑一个简单的模型，一个开放的部分扩展的地图。它在相空间中的陷集K是一个分形集。我们首先表明，有一个定义良好的离散谱的Ruelle共振描述的渐近的关联函数为大的时间和参数化的傅立叶分量ν的中性方向上的动力学。我们介绍一个具体的假设的动态，我们称之为“最小囚禁”。这个假设在扰动下是稳定的，意味着动力学在K的邻域上是单值的。在这个假设下，我们证明了在半经典极限ν->无穷远存在一个渐近谱隙和一个Ruelle共振密度上界的分形Weyl定律.用截断高斯映射进行的数值计算说明了这些结果。
英文摘要：
We consider a simple model of an open partially expanding map. Its trapped set K in phase space is a fractal set. We first show that there is a well defined discrete spectrum of Ruelle resonances which describes the asymptotics of correlation functions for large time and which is parametrized by the Fourier component νon the neutral direction of the dynamics. We introduce a specific hypothesis on the dynamics that we call "minimal captivity". This hypothesis is stable under perturbations and means that the dynamics is univalued on a neighborhood of K. Under this hypothesis we show the existence of an asymptotic spectral gap and a Fractal Weyl law for the upper bound of density of Ruelle resonances in the semiclassical limit ν-> infinity. Some numerical computations with the truncated Gauss map illustrate these results.
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