Von Neumann algebraic H^p theory

Details Von Neumann algebraic H^p theory Von Neumann algebraic H^p theory

2006-11-28

arxiv.org/abs/math/0611879v1

Mathematics

Operator Algebras

24 pages. Conference proceedings, mostly a survey article

Scientific paper

Around 1967, Arveson invented a striking noncommutative generalization of classical $H^\infty$, known as {\em subdiagonal algebras}, which include a wide array of examples of interest to operator theorists. Their theory extends that of the generalized $H^p$ spaces for function algebras from the 1960s, in an extremely remarkable, complete, and literal fashion, but for reasons that are `von Neumann algebraic'. Most of the present paper consists of a survey of our work on Arveson's algebras, and the attendant $H^p$ theory, explaining some of the main ideas in their proofs, and including some improvements and short-cuts. The newest results utilize new variants of the noncommutative Szeg\"{o} theorem for $L^p(M)$, to generalize many of the classical results concerning outer functions, to the noncommutative $H^p$ context. In doing so we solve several of the old open problems in the subject. We include full proofs, for the most part, of the simpler `antisymmetric algebra' special case of our results on outers.

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