Institute of Mathematics of NAS of Ukraine,
3 Tereshchenkivs'ka Str.,
01601 Kyiv-4, UKRAINE
L2-Betti numbers of Poisson configuration spaces
Abstract:
The space GX of all locally
finite configurations in a infinite covering X of a compact Riemannian
manifold is considered. The deRham complex of square-integrable differential
forms over GX, equipped with
the Poisson measure, and the corresponding deRham cohomology and the spaces
of harmonic forms are studied. We construct a natural von Neumann algebra
which contains the projection onto the space of harmonic forms and obtain
explicit formulae for the corresponding trace.