Hochschild Cohomology of Factors with Property $Γ$

Details Hochschild Cohomology of Factors with Property $Γ$ Hochschild Cohomology of Factors with Property $Γ$

2001-07-10

arxiv.org/abs/math/0107078v2

Ann. of Math. (2), vol. 158 (2003), no. 2, 635--659

Mathematics

Operator Algebras

25 pages, published version

Scientific paper

The main result of this paper is that the k^{\rm th} continuous Hochschild cohomology groups H^k(\cl M,\cl M) and H^k(\cl M,B(H)) of a von Neumann factor ${\cl M}\subseteq B(H) of type {\rm II}_1 with property Gamma are zero for all positive integers k. The method of proof involves the construction of hyperfinite subfactors with special properties and a new inequality of Grothendieck type for multilinear maps. We prove joint continuity in the $\|\cdot\|_2$-norm of separately ultraweakly continuous multilinear maps, and combine these results to reduce to the case of completely bounded cohomology which is already solved.

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