Torsion theories for algebras of affiliated operators of finite von Neumann algebras

Details Torsion theories for algebras of affiliated operators of finite von Neumann algebras Torsion theories for algebras of affiliated operators of finite von Neumann algebras

2007-02-18

arxiv.org/abs/math/0702528v1

Rocky Mountain Journal of Mathematics, 37 (2007), no. 6, 2053 - 2075

Mathematics

Rings and Algebras

To appear in Rocky Mountain Journal of Mathematics

Scientific paper

The dimension of any module over an algebra of affiliated operators ${\mathcal U}$ of a finite von Neumann algebra ${\mathcal A}$ is defined using a trace on ${\mathcal A}.$ All zero-dimensional ${\mathcal U}$-modules constitute the torsion class of torsion theory $(\mathrm{{\bf T}},\mathrm{{\bf P}})$. We show that every finitely generated ${\mathcal U}$-module splits as the direct sum of torsion and torsion-free part. Moreover, we prove that the theory $(\mathrm{{\bf T}},\mathrm{{\bf P}})$ coincides with the theory of bounded and unbounded modules and also with the Lambek and Goldie torsion theories. Lastly, we use the introduced torsion theories to give the necessary and sufficient conditions for ${\mathcal U}$ to be semisimple.

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