Three Ways to Representations of B^a(E)

Details Three Ways to Representations of B^a(E) Three Ways to Representations of B^a(E)

2004-04-30

arxiv.org/abs/math/0404557v1

In M. Sch\"urmann and U. Franz, editors,QP-PQ: Quantum Probability and White Noise Analysis XVIII, pages 504--517. World Sci

Mathematics

Operator Algebras

Scientific paper

We describe three methods to determine the structure of (sufficiently continuous) representations of the algebra B^a(E) of all adjointable operators on a Hilbert B-module E by operators on a Hilbert C-module. While the last and latest proof is simple and direct and new even for normal representations of B(H) (H some Hilbert space), the other ones are direct generalizations of the representation theory of B(H) (based on Arveson's and on Bhat's approaches to product systems of Hilbert spaces) and depend on technical conditions (for instance, existence of a unit vector or restriction to von Neumann algebras and von Neumann modules). We explain why for certain problems the more specific information available in the older approaches is more useful for the solution of the problem.

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