arXiv 2108.092022021-08-20math.CA

多线性符号算子的混合不等式

Mixed inequalities for commutators with multilinear symbol

Fabio Berra, Marilina Carena, Gladis Pradolini

备注：: 30 pages

摘要：

证明了具有多线性符号的Calderón-Zygmund算子（CZO）的分解子的混合不等式.具体地，令$m\in\mathbb{N}$和$\mathbf{b}=(b_1,b_2,\dots, b_m)$是矢量符号，使得每个分量$b_i\in \mathrm{Osc}_{\mathrm{exp}\, L^{r_i}}$，具有$r_i\geq 1$。如果$u\in A_1$和$v\in A_\infty(u)$，我们证明不等式\[uv\left(\left\{x\in \mathbb{R}^n: \frac{|T_\mathbf{b}(fv)(x)|}{v(x)}>t\right\}\right)\leq C\int_{\mathbb{R}^n}Φ\left(\|\mathbf{b}\|\frac{|f(x)|}{t}\right)u(x)v(x)\,dx\]对每个$t>0$成立，其中$Φ(t)=t(1+\log^+t)^r$，具有$1/r=\sum_{i=1}^m 1/r_i$。我们还考虑卷积型算子，其内核满足比CZO更少的正则性。在此基础上，我们给出了一个带多重线性符号的相关算子的Coifman型不等式.这一结果使我们能够推导出当$1<p<\infty$和$w\in A_p$ .因此，我们可以得到期望的混合不等式在这种情况下。

英文摘要：

We prove mixed inequalities for commutators of Calderón-Zygmund operators (CZO) with multilinear symbols. Concretely, let $m\in\mathbb{N}$ and $\mathbf{b}=(b_1,b_2,\dots, b_m)$ be a vectorial symbol such that each component $b_i\in \mathrm{Osc}_{\mathrm{exp}\, L^{r_i}}$, with $r_i\geq 1$. If $u\in A_1$ and $v\in A_\infty(u)$ we prove that the inequality \[uv\left(\left\{x\in \mathbb{R}^n: \frac{|T_\mathbf{b}(fv)(x)|}{v(x)}>t\right\}\right)\leq C\int_{\mathbb{R}^n}Φ\left(\|\mathbf{b}\|\frac{|f(x)|}{t}\right)u(x)v(x)\,dx\] holds for every $t>0$, where $Φ(t)=t(1+\log^+t)^r$, with $1/r=\sum_{i=1}^m 1/r_i$. We also consider operators of convolution type with kernels satisfying less regularity properties than CZO. In this setting, we give a Coifman type inequality for the associated commutators with multilinear symbol. This result allows us to deduce the $L^p(w)$-boundedness of these operators when $1<p<\infty$ and $w\in A_p$. As a consequence, we can obtain the desired mixed inequality in this context.

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英文摘要：

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