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arXiv 1111.1357math.CAmath.FA
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圆盘的指数正交集的大小

Size of orthogonal sets of exponentials for the disk

Alex Iosevich, Mihail N. Kolountzakis

摘要:

假设$Λ\subseteq \RR^2$具有频率来自$Λ$的任意两个指数在$L^2(D)$空间中正交的性质,其中$D \subseteq \RR^2$是单位圆盘.已知这样的集合$Λ$是有限的,但不知道它们的大小是否一致有界。我们表明,如果有两个元素的$Λ$的距离$t$分开,那么$Λ$的大小是$O(t)$。因此,我们改进了Iosevich和Jaming的一个结果,证明了在半径为$R$的任意圆盘中,$Λ$至多有$O(R^{2/3})$元.

英文摘要:

Suppose $Λ\subseteq \RR^2$ has the property that any two exponentials with frequency from $Λ$ are orthogonal in the space $L^2(D)$, where $D \subseteq \RR^2$ is the unit disk. Such sets $Λ$ are known to be finite but it is not known if their size is uniformly bounded. We show that if there are two elements of $Λ$ which are distance $t$ apart then the size of $Λ$ is $O(t)$. As a consequence we improve a result of Iosevich and Jaming and show that $Λ$ has at most $O(R^{2/3})$ elements in any disk of radius $R$.

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