Multipliers and integration operators between conformally invariant spaces

Abstract

In this paper we are concerned with two classes of conformally invariant spaces of analytic functions in the unit disc $\D$, the Besov spaces $B^p$ $(1\le p<\infty )$ and the $Q_s$ spaces $(0<s<\infty )$. Our main objective is to characterize for a given pair $(X,Y)$ of spaces in these classes, the space of pointwise multipliers $M(X,Y)$, as well as to study the related questions of obtaining characterizations of those $g$ analytic in $\D $ such that the Volterra operator $T_g$ or the companion operator $I_g$ with symbol $g$ is a bounded operator from $X$ into $Y$.

To appear in Rev. R. Acad. Cienc. Exactas Fís. Nat. Ser. A Mat. RACSAM