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arXiv 1607.06019math.DS
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环面自同构群的丢番图性质

Diophantine properties of groups of toral automorphisms

Vladimir Finkelshtein

摘要:

我们证明了尖锐的估计在收缩目标问题的行动的任意子群$Γ$的$SL_2(\mathbb{Z})$的2-环面。这也可以被视为非交换的丢番图逼近问题。该方法需要在Gromov双曲空间上的群上构造谱最优随机游动。此外,使用傅里叶分析,我们在更高的维度,同样的问题给出了估计。

英文摘要:

We prove sharp estimates in a shrinking target problem for the action of an arbitrary subgroup $Γ$ of $SL_2(\mathbb{Z})$ on the 2-torus. This can also be viewed as a non-commutative Diophantine approximation problem. The methods require constructing spectrally optimal random walks on groups acting properly cocompactly on Gromov hyperbolic spaces. Additionally, using Fourier analysis we give estimates for the same problem in higher dimensions.

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