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arXiv 2001.05804math.FAmath.DS
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幂有界算子与连续性的平均遍历定理

Power bounded operators and the mean ergodic theorem for subsequences

Tanja Eisner, Vladimir Müller

摘要:

设$T$是一个幂有界的希尔伯特空间算子,其特征值为零.我们证明了对于广泛的序列$(a_n)$,包括大多数次多项式Hardy函数的整数部分,序列遍历平均$N^{-1}\sum_{n=1}^N T^{a_n}$收敛于强算子拓扑.此外,我们还证明了加权平均值$N^{-1}\sum_{n=1}^N e^{2πi g(n)}T^{a_n}$对许多合理的函数$g$也是收敛的。特别是,我们推广的多项式平均遍历定理的权力有界算子由于特埃尔斯特和第二作者\cite{tEM}真正的多项式和多项式的重量。

英文摘要:

Let $T$ be a power bounded Hilbert space operator without unimodular eigenvalues. We show that the subsequential ergodic averages $N^{-1}\sum_{n=1}^N T^{a_n}$ converge in the strong operator topology for a wide range of sequences $(a_n)$, including the integer part of most of subpolynomial Hardy functions. Moreover, we show that the weighted averages $N^{-1}\sum_{n=1}^N e^{2πi g(n)}T^{a_n}$ also converge for many reasonable functions $g$. In particular, we generalize the polynomial mean ergodic theorem for power bounded operators due to ter Elst and the second author \cite{tEM} to real polynomials and polynomial weights.

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