Comonoidal W*-Morita equivalence for von Neumann bialgebras

Details Comonoidal W*-Morita equivalence for von Neumann bialgebras Comonoidal W*-Morita equivalence for von Neumann bialgebras

2010-04-06

arxiv.org/abs/1004.0824v1

Mathematics

Operator Algebras

20 pages

Scientific paper

A theory of Galois co-objects for von Neumann bialgebras is introduced. This concept is closely related to the notion of comonoidal W*-Morita equivalence between von Neumann bialgebras, which is a Morita equivalence taking the comultiplication structure into account. We show that the property of `being a von Neumann algebraic quantum group' (i.e. `having invariant weights') is preserved under this equivalence relation. We also introduce the notion of a projective corepresentation for a von Neumann bialgebra, and show how it leads to a construction method for Galois co-objects and comonoidal W*-Morita equivalences.

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