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arXiv 2203.04360math.CA
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关于奇异积分算子的混合型Festhiman-Stein不等式

Mixed inequalities of Fefferman-Stein type for singular integral operators

Fabio Berra, Marilina Carena, Gladis Pradolini

摘要:

本文给出了与Calderón-Zygmund算子的混合估计有关的Festermain-Stein型不等式.更精确地说,给定$δ>0$,$q>1$,$φ(z)=z(1+\log^+z)^δ$,一个非负的和局部可积的函数$u$和$v\in \mathrm{RH}_\infty\cap A_q$,我们证明了不等式\[uv\left(\left\{x\in \mathbb{R}^n: \frac{|T(fv)(x)|}{v(x)}>t\right\}\right)\leq \frac{C}{t}\int_{\mathbb{R}^n}|f|\left(M_{φ, v^{1-q'}}u\right)M(Ψ(v))\]与$Ψ(z)=z^{p'+1-q'}\mathcal{X}_{[0,1]}(z)+z^{p'}\mathcal{X}_{[1,\infty)}(z)$对每个$t>0$和每个$p>\max\{q,1+1/δ\}$成立。这个不等式提供了在\cite{CruzUribe-Martell-Perez}中证明的Calderón-Zygmund算子的混合估计的更一般的版本。它还推广了\cite{P94}中给出的Festhiman-Stein估计。我们进一步得到了卷积型算子的类似估计,其中卷积型算子的核满足$L^Φ-$ Hörmander条件,推广了一些已知的结果,其中涉及混合估计和Festhiman-Stein不等式.

英文摘要:

We give Feffermain-Stein type inequalities related to mixed estimates for Calderón-Zygmund operators. More precisely, given $δ>0$, $q>1$, $φ(z)=z(1+\log^+z)^δ$, a nonnegative and locally integrable function $u$ and $v\in \mathrm{RH}_\infty\cap A_q$, we prove that the inequality \[uv\left(\left\{x\in \mathbb{R}^n: \frac{|T(fv)(x)|}{v(x)}>t\right\}\right)\leq \frac{C}{t}\int_{\mathbb{R}^n}|f|\left(M_{φ, v^{1-q'}}u\right)M(Ψ(v))\] holds with $Ψ(z)=z^{p'+1-q'}\mathcal{X}_{[0,1]}(z)+z^{p'}\mathcal{X}_{[1,\infty)}(z)$, for every $t>0$ and every $p>\max\{q,1+1/δ\}$. This inequality provides a more general version of mixed estimates for Calderón-Zygmund operators proved in \cite{CruzUribe-Martell-Perez}. It also generalizes the Fefferman-Stein estimates given in \cite{P94} for the same operators. We further get similar estimates for operators of convolution type with kernels satisfying an $L^Φ-$Hörmander condition, generalizing some previously known results which involve mixed estimates and Fefferman-Stein inequalities for these operators.

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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