Search arXiv⌕ Search
Home/Archive/arXiv

arXiv · funct-an/9403003

Crossed product decompositions of a purely infinite von Neumann algebra with faithful, almost periodic weight

Kenneth J. Dykema
View original source ↗Read source document ↗Export metadata ↓

Abstract

For $\MvN$ a separable, purely infinite von Neumann algebra with almost periodic weight $ϕ$, a decomposition of $\MvN$ as a crossed product of a semifinite von Neumann algebra by a trace--scaling action of a countable abelian group is given. Then Takasaki's continuous decomposition of the same algebra is related to the above discrete decomposition via Takesaki's notion of induced action, but here one induces up from a dense subgroup. The above results are used to give a model for the one--parameter trace--scaling action of $\Real_+$ on the injective II$_\infty$ factor. Finally, another model of the same action, due to work of Aubert and explained by Jones, is described.

Explore related subjects

funct-anmath.OA

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Kenneth J. Dykema. 1994-03-07. Crossed product decompositions of a purely infinite von Neumann algebra with faithful, almost periodic weight. https://arxiv.org/abs/funct-an/9403003

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

arXiv2024

Tensor Products of Fell Bundles over Groups

We extend the theory of tensor products of C*-algebras to the larger category of Fell bundles over locally compact groups. We prove that, like in the case of C*-algebras, there exist maximal and minimal tensor products. Given two Fell bundles, we compare the tensor products of their cross-sectional algebras with the cross-sectional algebras of their tensor products. As applications we prove that, under certain conditions, the cross-sectional C*-algebra of a Fell bundle is nuclear or exact whenever so is its fiber over the unit element of the group.

funct-an↗
arXiv2020

Isomorphism classes for quantum Heisenberg manifolds

We embed the quantum Heisenberg manifold in a crossed product algebra. This enables us to show that, in the irrational case, all tracial states on $\dc$ induce the same homomorphism on the K_0-group. We conclude that two irrational quantum Heisenberg manifolds $\dc$ and $D^c_{μ' ν'}$ are isomorphic if and only if the parameters $(μ,ν)$ and $(μ',ν')$ belong to the same orbit under the usual action of $GL_2(\ZZ)$ on the torus.

funct-an↗
arXiv2010

Hilbert C*-modules over monotone complete C*-algebras

The aim of the present paper is to describe self-duality and C*- reflexivity of Hilbert {\bf A}-modules $\cal M$ over monotone complete C*-algebras {\bf A} by the completeness of the unit ball of $\cal M$ with respect to two types of convergence being defined, and by a structural criterion. The derived results generalize earlier results of {\sc H.~Widom} [Duke Math.~J.~23, 309-324, MR 17 \# 1228] and {\sc W.~L.~Paschke} [Trans. Amer.~Math.~Soc.~182, 443-468, MR 50 \# 8087, Canadian J.~Math.~26, 1272-1280, MR 57 \# 10433]. For Hilbert C*-modules over commutative AW*-algebras the equivalence of the self-duality property and of the Kaplansky-Hilbert property is reproved, (cf. {\sc M.~Ozawa} [J.~Math.~Soc.~Japan 36, 589-609, MR 85m:46068] ). Especially, one derives that for a C*-algebra {\bf A} the {\bf A}-valued inner pro\-duct of every Hilbert {\bf A}-module $\cal M$ can be continued to an {\bf A}-valued inner product on it's {\bf A}-dual Banach {\bf A}-module $\cal M$' turning $\cal M$' to a self-dual Hilbert {\bf A}-module if and only if {\bf A} is monotone complete (or, equivalently, additively complete) generalizing a result of {\sc M.~Hamana} [Internat.~J.~Math.~3(1992), 185-204]. A classification of countably generated self-dual Hilbert {\bf A}-modules over monotone complete C*-algebras {\bf A} is established. The set of all bounded module operators ${\bf End}_A (\cal M)$ on self-dual Hilbert {\bf A}-modules $\cal M$ over monotone complete C*-algebras {\bf A} is proved again to be a monotone complete

funct-an↗