Schur multipliers and de Branges-Rovnyak spaces: the multiscale case

Details Schur multipliers and de Branges-Rovnyak spaces: the multiscale case Schur multipliers and de Branges-Rovnyak spaces: the multiscale case

2006-05-12

arxiv.org/abs/math/0605331v2

Mathematics

Operator Algebras

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Scientific paper

We consider bounded linear operators acting on the $\ell_2$ space indexed by the nodes of a homogeneous tree. Using the Cuntz relations between the primitive shifts on the tree, we generalize the notion of the single-scale time-varying point evaluation and introduce the corresponding reproducing kernel Hilbert space in which Cauchy's formula holds. These notions are then used in the study of the Schur multipliers and of the associated de Branges-Rovnyak spaces. As an application we obtain realization of Schur multipliers as transfer operators of multiscale input-state-output systems.

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