Boundedness and compactness of composition operators on Segal-Bargmann spaces

Details Boundedness and compactness of composition operators on Segal-Bargmann spaces Boundedness and compactness of composition operators on Segal-Bargmann spaces

2011-11-30

arxiv.org/abs/1111.7294v1

Mathematics

Functional Analysis

15 pages

Scientific paper

For $E$ a Hilbert space, let $\mathcal{H}(E)$ denote the Segal-Bargmann space (also known as the Fock space) over $E$, which is a reproducing kernel Hilbert space with kernel $K(x,y)=\exp(< x,y>)$ for $x,y$ in $E$. If $\phi$ is a mapping on $E$, the composition operator $C_{\phi}$ is defined by $C_{\phi}h = h\circ\phi$ for $h\in \mathcal{H}(E)$ for which $h\circ\phi$ also belongs to $\mathcal{H}(E)$. We determine necessary and sufficient conditions for the boundedness and compactness of $C_{\phi}$. Our results generalize results obtained earlier by Carswell, MacCluer and Schuster for finite dimensional spaces $E$.

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