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arXiv 2610.18544math.CA
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关于极大函数的变差与渐近行为

On the variation and asymptotics of maximal functions

ICTP – The Abdus Salam International Centre for Theoretical Physics(阿卜杜斯·萨拉姆国际理论物理中心);ICTP(阿卜杜斯·萨拉姆国际理论物理中心)

Emanuel Carneiro, Julian Weigt

AI总结:

本文针对卷积型极大算子变差的两个猜想取得部分进展,在1维和更高维度分别证明了相关变差不等式,确定了维度相关常数的最优渐近依赖关系,其结果依赖于单位球Hardy-Littlewood极大函数的新渐近估计。

摘要:

本文针对与积分值为1的非负径向递减核φ相关的卷积型极大算子M_φ的变差的两个猜想,取得了部分进展。在维度d=1时,证明了当f为特征函数时,var(M_φ f) ≤ var(f);在更高维度时,证明了当f为径向特征函数时,var(M_φ f) ≤ C_d var(f),其中常数C_d仅依赖于维度d,与核φ无关。进一步表明,此类不等式对d的最优依赖关系为C_d ~ √d log d,该结论依赖于对R^d中单位球的Hardy-Littlewood极大函数的新颖显式渐近估计,这是一项具有独立意义的结果。

英文摘要:

In this paper we present partial progress towards two conjectures on the variation of maximal operators of convolution type $\mathrm{M}_φ$, associated to non-negative and radial decreasing kernels $φ$ of integral $1$. In dimension $d=1$ we prove that $\mathrm{var}(\mathrm{M}_φ f) \leq \mathrm{var}(f)$ when $f$ is a characteristic function. In higher dimensions we prove that $\mathrm{var}(\mathrm{M}_φ f) \leq C_d \mathrm{var}(f)$ when $f$ is a radial characteristic function, with a constant $C_d$ depending only on the dimension $d$ but not on the kernel $φ$. We further show that $C_d \sim \sqrt{d}\log d $ is the sharp dependence on $d$ for such an inequality. This last claim relies on a novel explicit asymptotic estimate for the Hardy-Littlewood maximal function of the unit ball in $\mathbb R^d$, a result of independent interest.

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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