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arXiv 2608.24606math.CV

非线性傅里叶变换的一个极大估计

A maximal estimate for the non-linear Fourier transform

Alexei Poltoratski

AI总结:

该研究针对半直线上L²函数的非线性傅里叶变换相关极大算子,在特定集合上证明了弱型极大与极大波动估计,相关集合可覆盖几乎整个实直线。

AI中文摘要:

我们讨论半直线上L²函数的非线性傅里叶变换相关的极大算子估计。对于具有有界二进L¹质量的势函数,我们在谱密度远离零且谱数据的三个经典极大函数一致较小的集合上,证明了弱型极大估计和极大波动估计;当这些集合的定义参数放宽时,它们几乎覆盖整个实直线。

英文摘要:

We discuss estimates for the maximal operator associated with the non-linear Fourier transform of an $L^2$-function on the half-line. For potentials with bounded dyadic $L^1$ masses we prove weak-type maximal and maximal fluctuation estimates on the sets where the spectral densities are bounded away from zero and three classical maximal functions of the spectral data are uniformly small; such sets exhaust almost all of the real line as the parameters of their definition relax.

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