Singular MASAs in type III factors and Connes' Bicentralizer Property

Published 24 Apr 2017 in math.OA | (1704.07255v3)

Abstract: We show that any type ${\rm III_1}$ factor with separable predual satisfying Connes' Bicentralizer Property (CBP) has a singular maximal abelian $\ast$-subalgebra that is the range of a normal conditional expectation. We also investigate stability properties of CBP under finite index extensions/restrictions of type ${\rm III_1}$ factors.

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