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arXiv 0705.4203math.DSmath.NTmath.PR
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动力学丢番图逼近

Dynamical Diophantine Approximation

Ai-Hua Fan, Joerg Schmeling, Serge Troubetzkoy

摘要:

设$μ$是圆的加倍映射$T$的吉布斯测度。对于$μ$ -通用点$x$和给定序列$\{r_n\} \subset \R^+$,考虑间隔$(T^nx - r_n \pmod 1, T^nx + r_n \pmod 1)$。在类比经典的Dvoretzky覆盖的圆,我们研究的覆盖性质,这个序列的间隔。本研究与吉布斯测度的局部熵函数和运动目标的命中时间密切相关。对于多重分形的吉布斯测度,得到了一个质量迁移原理。Beresnevich和Velani \cite{BV}只对单分形测度证明了这个原理。在符号语言中,我们完整地描述了一个典型的相对较短的序列的组合结构,特别是我们可以描述“非典型”的相对较长的词的出现。我们的结果有一个直接的和深刻的数论解释,通过非齐次二进丢番图逼近的数字属于一个给定的(二进)丢番图类。

英文摘要:

Let $μ$ be a Gibbs measure of the doubling map $T$ of the circle. For a $μ$-generic point $x$ and a given sequence $\{r_n\} \subset \R^+$, consider the intervals $(T^nx - r_n \pmod 1, T^nx + r_n \pmod 1)$. In analogy to the classical Dvoretzky covering of the circle we study the covering properties of this sequence of intervals. This study is closely related to the local entropy function of the Gibbs measure and to hitting times for moving targets. A mass transference principle is obtained for Gibbs measures which are multifractal. Such a principle was shown by Beresnevich and Velani \cite{BV} only for monofractal measures. In the symbolic language we completely describe the combinatorial structure of a typical relatively short sequence, in particular we can describe the occurrence of ''atypical'' relatively long words. Our results have a direct and deep number-theoretical interpretation via inhomogeneous diadic diophantine approximation by numbers belonging to a given (diadic) diophantine class.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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