Siegel变换的螺旋近似和球平均
Spiraling of approximations and spherical averages of Siegel transforms
摘要：
我们考虑的问题，如何近似满足狄利克雷定理螺旋周围的向量在$\mathbb{R}^d$。我们给逐点的几乎处处结果（只使用Birkhoff遍历定理的空间格）。此外，我们还证明了对于$\textit{every}$么模格，平均而言，在$d-1$维单位球面上，近似螺旋的方向是均匀分布的.对于第二个结果，我们采用了Marklof和Strömbergsson \cite{MS3}的最近证明，以显示$\operatorname{SL}_{d+1}(\mathbb{R})/\operatorname{SL}_{d+1}(\mathbb{Z})$上西格尔变换的球形平均结果。我们的技术是初级的。这类结果可以追溯到Eskin-Margulis-Mozes \cite{EMM}和Kleinbock-Margulis \cite{KM}的工作，并具有广泛的应用。我们还明确地构造了方向不均匀分布的例子。
英文摘要：
We consider the question of how approximations satisfying Dirichlet's theorem spiral around vectors in $\mathbb{R}^d$. We give pointwise almost everywhere results (using only the Birkhoff ergodic theorem on the space of lattices). In addition, we show that for $\textit{every}$ unimodular lattice, on average, the directions of approximates spiral in a uniformly distributed fashion on the $d-1$ dimensional unit sphere. For this second result, we adapt a very recent proof of Marklof and Strömbergsson \cite{MS3} to show a spherical average result for Siegel transforms on $\operatorname{SL}_{d+1}(\mathbb{R})/\operatorname{SL}_{d+1}(\mathbb{Z})$. Our techniques are elementary. Results like this date back to the work of Eskin-Margulis-Mozes \cite{EMM} and Kleinbock-Margulis \cite{KM} and have wide-ranging applications. We also explicitly construct examples in which the directions are not uniformly distributed.
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