A generalized weighted Hardy-Cesàro operator, and its commutator on weighted $L^p$ and BMO spaces

Abstract

In this paper, we introduce a new weighted Hardy-Cesàro operator defined by $U_{\psi ,s}f(x)=\underset{0}{\overset{1}{\int }}f(s(t)\cdot x)\psi (t)dt$, which is associated to the parameter curve $s(t,x)=s(t)x$. Under certain conditions on $s(t)$ and on an absolutely homogeneous weight function $\omega$, we characterize the weight function $\psi$ such that $U_{\psi ,s}$ is bounded on $L^p(\omega )$, $BMO(\omega )$. The corresponding operator norms are worked out too. These results extend the ones of Jie Xiao \cite{xiao}. We also give a sufficient and a necessary condition on the weight function $\psi$, which ensure the boundedness of the commutators of operator $U_{\psi ,s}$ on $L^p(\omega )$ with symbols in $BMO(\omega )$.

19 pages