Universal multipliers for Sub-Hardy Hilbert spaces

TL;DR

The paper develops a general framework for universal multipliers in de Branges-Rovnyak spaces, providing new proofs and characterizations for classes like Lipschitz and Gevrey, extending the Davis-McCarthy theorem.

Contribution

It introduces a unified approach to universal multipliers in de Branges-Rovnyak spaces and characterizes them for specific function classes, generalizing existing theorems.

Findings

New proof of Davis-McCarthy universal multiplier theorem.

Characterization of Lipschitz classes as universal multipliers.

Characterization of Gevrey classes as universal multipliers.

Abstract

To every non-extreme point $b$ of the unit ball of $\hil^\infty$ of the unit disk there corresponds a Pythagorean mate, a bounded outer function $a$ satisfying the equation $|a|^2 + |b|^2 = 1$ on the boundary of the disk. We study universal, i.e., simultaneous multipliers for families of de Branges-Rovnyak spaces $\hb$, and develop a general framework for this purpose. Our main results include a new proof of the Davis-McCarthy universal multiplier theorem for the class of all non-extreme spaces $\hb$, a characterization of the Lipschitz classes as the universal multipliers for spaces $\hb$ for which the quotient $b/a$ is contained in a Hardy space, and a similar characterization of the Gevrey classes as the universal multipliers for spaces $\hb$ for which $b/a$ is contained in a Privalov class.