# Weighted vector-valued estimates for a non-standard Calder\'on-Zygmund
operator

Research paper by **Guoen Hu**

Indexed on: **25 Feb '16**Published on: **25 Feb '16**Published in: **Mathematics - Classical Analysis and ODEs**

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#### Abstract

In this paper, the author considers the weighted vector-valued estimate for
the operator defined by $$T_Af(x)={\rm
p.\,v.}\int_{\mathbb{R}^n}\frac{\Omega(x-y)}{|x-y|^{n+1}}\big(A(x)-A(y)-\nabla
A(y)\big)f(y){\rm d}y,$$ where $\Omega$ is homogeneous of degree zero, has
vanishing moment of order one, $A$ is a function in $\mathbb{R}^n$ such that
$\nabla A\in {\rm BMO}(\mathbb{R}^n)$. By a pointwise estimate for
$\|\{T_Af_k(x)\}\|_{l^q}$ and the weighted $L^p$ estimates for the sparse
operator $$\mathcal{A}_{\mathcal{S},\,L(\log
L)^\beta}f(x)=\sum_{Q\in\mathcal{S}}\|f\|_{L(\log L)^{\beta},\,Q}\chi_{Q}(x)
,$$ the author obtains a refined weighted vector-valued estimate for $T_A$.
Also, the author establishes sharp weighted vector-valued inequalities for the
maximal operator $M_{L(\log L)^{l}}$ with $l\in\mathbb{N}$.