A generalised Green-Julg theorem for proper groupoids and Banach algebras

Details A generalised Green-Julg theorem for proper groupoids and Banach algebras A generalised Green-Julg theorem for proper groupoids and Banach algebras

2009-02-25

arxiv.org/abs/0902.4365v1

Mathematics

K-Theory and Homology

42 pages; submitted

Scientific paper

The Green-Julg theorem states that K_0^G(B) is isomorphic to K_0(L^1(G,B)) for every compact group G and every G-C*-algebra B. We formulate a generalisation of this result to proper groupoids and Banach algebras and deduce that the Bost assembly map is surjective for proper Banach algebras. On the way, we show that the spectral radius of an element in a C_0(X)-Banach algebra can be calculated from the spectral radius in the fibres.

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