Riesz and Szeg\"o type factorizations for noncommutative Hardy spaces

By T. Bekjan, Quanhua Xu. 2007

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Let $\A$ be a finite subdiagonal algebra in Arveson's sense. Let $H^p(\A)$ be the associated noncommutative Hardy spaces, $0<p\le\8$. We extend to the case of all positive indices most recent results about these spaces, which include notably the Riesz, Szeg\"o and inner-outer type factorizations. One new tool of the paper is the contractivity of the underlying conditional expectation on $H^p(\A)$ for $p<1$.

Subfields: Applied Mathematics, Mathematical Physics

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