A family of fractional Volterra operators parameterized by radial doubling weights is bounded (compact) on Hardy spaces iff the symbol is in BMOA (VMOA), and Schatten membership is governed by an integral condition on the weight.
Maximal theorems for weighted analytic tent and mixed norm spaces
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abstract
Let $\omega$ be a radial weight, $0<p,q<\infty$ and $\Gamma(\xi)=\left\{z\in\mathbb{D}:|\arg z-\arg\xi|<(|\xi|-|z|)\right\}$ for $\xi\in\overline{\mathbb{D}}$ . The average radial integrability space $L^q_p(\omega)$ consists of complex-valued measurable functions $f$ on the unit disc $\mathbb{D}$ such that $$\|f\|^q_{L^q_p(\omega)}=\frac{1}{2\pi}\int_{0}^{2\pi}\left(\int_{0}^{1}|f(re^{i\theta})|^p\omega(r)r\,dr\right)^{\frac{q}{p}}d\theta <\infty,$$ and the tent space $T^q_p(\omega)$ is the set of those $f$ for which $$\|f\|^q_{T_{p}^{q}(\omega)}=\frac{1}{2\pi}\int_{\partial{\mathbb{D}}}\left(\int_{\Gamma(\xi)}|f(z)|^p\omega(z)\frac{dA(z)}{1-|z|}\right)^{\frac{q}{p}}\,|d\xi|<\infty.$$ Let $\mathcal{H}(\mathbb{D})$ denote the space of analytic functions in $\mathbb{D}$. It is shown that the non-tangential maximal operator $$f\mapsto N(f)(\xi)=\sup_{z\in\Gamma(\xi)}|f(z)|,\quad \xi\in \mathbb{D},$$ is bounded from $AL^q_p(\omega)=L^q_p(\omega)\cap\mathcal{H}(\mathbb{D})$ and $AT^q_p(\omega)=T^q_p(\omega)\cap\mathcal{H}(\mathbb{D})$ to $L^q_p(\omega)$ and $T^q_p(\omega)$, respectively. These pivotal inequalities are used to establish further results such as the density of polynomials in $AL^q_p(\omega)$ and $AT^q_p(\omega)$, and the identity $AL^q_p(\omega)=AT^q_p(\omega)$ for weights admitting a one-sided integral doubling condition. It is also shown that the boundedness of the classical Bergman projection $P_\gamma$, induced by the standard weight $(\gamma+1)(1-|z|^2)^{\gamma}$, on $L^q_p(\omega)$ and $T^q_p(\omega)$ with $1<q,p<\infty$ is independent of $q$, and is described by a Bekoll\'e-Bonami type condition.
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Fractional Volterra-type operator induced by radial weight acting on Hardy space
A family of fractional Volterra operators parameterized by radial doubling weights is bounded (compact) on Hardy spaces iff the symbol is in BMOA (VMOA), and Schatten membership is governed by an integral condition on the weight.