Limiting weak-type behaviors for singular integrals with rough $L\log L(\mathbb{S}^n)$ kernels
| Autor: | Qin, Moyan, Wu, Huoxiong, Xue, Qingying |
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| Rok vydání: | 2021 |
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| Druh dokumentu: | Working Paper |
| Popis: | Let $\Omega$ be a function of homogeneous of degree zero and vanish on the unit sphere $\mathbb {S}^n$. In this paper, we investigate the limiting weak-type behavior for singular integral operator $T_\Omega$ associated with rough kernel $\Omega$. We show that, if $\Omega\in L\log L(\mathbb S^{n})$, then $\lim_{\lambda\to0^+}\lambda|\{x\in\mathbb{R}^n:|T_\Omega(f)(x)|>\lambda\}| = n^{-1}\|\Omega\|_{L^1(\mathbb {S}^n)}\|f\|_{L^1(\mathbb{R}^n)},\quad0\le f\in L^1(\mathbb{R}^n).$ Moreover,$(n^{-1}\|\Omega\|_{L^1(\mathbb{S}^{n-1})}$ is a lower bound of weak-type norm of $T_\Omega$ when $\Omega\in L\log L(\mathbb{S}^{n-1})$. Corresponding results for rough bilinear singular integral operators defined in the form $T_{\vec\Omega}(f_1,f_2) = T_{\Omega_1}(f_1)\cdot T_{\Omega_2}(f_2)$ have also been established. Comment: 26 pages. arXiv admin note: text overlap with arXiv:2011.11512 |
| Databáze: | arXiv |
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