Date
Tue, 22 Oct 2013
Time
17:00 - 18:25
Location
C6
Speaker
David McConnell
Organisation
Trinity College Dublin

The problem of representing a (non-commutative) C*-algebra $A$ as the

algebra of sections of a bundle of C*-algebras over a suitable base

space may be viewed as that of finding a non-commutative Gelfand-Naimark

theorem. The space $\mathrm{Prim}(A)$ of primitive ideals of $A$, with

its hull-kernel topology, arises as a natural candidate for the base

space. One major obstacle is that $\mathrm{Prim}(A)$ is rarely

sufficiently well-behaved as a topological space for this purpose. A

theorem of Dauns and Hofmann shows that any C*-algebra $A$ may be

represented as the section algebra of a C*-bundle over the complete

regularisation of $\mathrm{Prim}(A)$, which is identified in a natural

way with a space of ideals known as the Glimm ideals of $A$, denoted

$\mathrm{Glimm}(A)$.

In the case of the minimal tensor product $A \otimes B$ of two

C*-algebras $A$ and $B$, we show how $\mathrm{Glimm}(A \otimes B)$ may

be constructed in terms of $\mathrm{Glimm}(A)$ and $\mathrm{Glimm} (B)$.

As a consequence, we describe the associated C*-bundle representation of

$A \otimes B$ over this space, and discuss properties of this bundle

where exactness of $A$ plays a decisive role.

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