Frame properties induced by iteration of a multiplication operator on Hardy spaces

Abstract

Motivated by the study of frame properties arising from iterates of linear operators, it was previously established that the multiplication operator $T_{\phi}x(t) = \phi(t)x(t)$ cannot generate a frame in $L^2(a,b)$ (Results Math, 2019). In this note, we examine the behavior of such operators on the Hardy space $H^2(D)$, the Hilbert space of holomorphic functions on the open unit disk $D$ with square integrable boundary values. We show that, in contrast to the $L^2$-setting, the iterates of $T_{\phi}$, for $\phi \in H^{\infty}(D)$, exhibit fundamentally different frame properties in $H^2(D)$, leading to new structural insights and results.