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arXiv 0704.0808math.CA
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关于向量场上希尔伯特变换的EM Stein猜想

On a Conjecture of EM Stein on the Hilbert Transform on Vector Fields

Michael Lacey, Xiaochun Li

摘要:

设$ v$是平面上的光滑向量场,即从平面到单位圆的映射。研究了希尔伯特变换\operatorname H_{v, ε} f(x):= \text{p.v.} \int_{-ε}^ εf(x-yv(x))\frac{dy} y有界性的充分条件,其中$ ε$是一个适当选择的参数,由向量场的光滑性决定.这是一个猜想,由于E。\thinspace M. \thinspace Stein,如果$ v$是Lipschitz,则存在正的$ ε$,对于该正的$ ε$,上述变换在$ L ^{2}$上有界。我们的主要结果给出了一个充分条件的最大函数的有界性与$ v$。这个充分条件是这个新的极大函数在某个$ L ^{p}$上有界,对于某个$ 1<p<2$。证明了对于所有Lipschitz极大函数,极大函数从$ L ^{2}$到弱$ L ^{2}$是有界的.我们的结果和其他已知的充分条件之间的关系进行了探讨。

英文摘要:

Let $ v$ be a smooth vector field on the plane, that is a map from the plane to the unit circle. We study sufficient conditions for the boundedness of the Hilbert transform \operatorname H_{v, ε}f(x) := \text{p.v.}\int_{-ε}^ εf(x-yv(x)) \frac{dy}y where $ ε$ is a suitably chosen parameter, determined by the smoothness properties of the vector field. It is a conjecture, due to E.\thinspace M.\thinspace Stein, that if $ v$ is Lipschitz, there is a positive $ ε$ for which the transform above is bounded on $ L ^{2}$. Our principal result gives a sufficient condition in terms of the boundedness of a maximal function associated to $ v$. This sufficient condition is that this new maximal function be bounded on some $ L ^{p}$, for some $ 1<p<2$. We show that the maximal function is bounded from $ L ^{2}$ to weak $ L ^{2}$ for all Lipschitz maximal function. The relationship between our results and other known sufficient conditions is explored.

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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