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Analytic Subalgebras of Von Neumann Algebras
Journal article   Peer reviewed

Analytic Subalgebras of Von Neumann Algebras

Paul S Muhly and Kichi-Suke Saito
Canadian journal of mathematics, Vol.39(1), pp.74-99
02/01/1987
DOI: 10.4153/CJM-1987-005-4

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Abstract

Let M be a von Neumann algebra and let {α t } t∊R be a σ-weakly continuous flow on M; i.e., suppose that {α t } t∊R is a one-parameter group of *-automorphisms of M such that for each ρ in the predual, M∗, of M and for each x ∊ M, the function of t, ρ(α t (x)), is continuous on R. In recent years, considerable attention has been focused on the subspace of M, H∞(α), which is defined to be where H ∞(R) is the classical Hardy space consisting of the boundary values of functions bounded analytic in the upper half-plane. In Theorem 3.15 of [8] it is proved that in fact H∞(α) is a σ-weakly closed subalgebra of M containing the identity operator such that is σ-weakly dense in M, and such that

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