Abstract:We study frames for Hardy spaces generated by orbits of multiplication operators. We characterize the symbols $\varphi \in H^\infty(\mathbb{T}^N)$ for which the multiplication operator $M_\varphi$ admits a frame of orbits on $H^2(\mathbb{T}^N)$. We also show that, in this setting, the existence of a frame is equivalent to the existence of a Parseval frame. Moreover, for $N=1$ we prove that finitely many orbits suffice if and only if $\varphi$ is a finite Blaschke product. For $N > 1$, no finite collection of orbits can generate a frame, regardless of the symbol. We study the analogous problem for the adjoint operator $M_\varphi^*$. Our results extend to the infinite-dimensional torus $\mathbb{T}^\infty$ and, via Bohr's transform, to the Hardy space of Dirichlet series $\mathcal{H}_2$.
From: Daniel Carando [view email]
[v1]
Sat, 30 May 2026 22:25:49 UTC (16 KB)
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