Periodic cyclic homology of reductive p-adic groups

Details Periodic cyclic homology of reductive p-adic groups Periodic cyclic homology of reductive p-adic groups

2007-10-31

arxiv.org/abs/0710.5815v2

Journal of Noncommutative Geometry 3 (2009), 501-558

Mathematics

K-Theory and Homology

Second version, 56 pages. Lemma 2.9 of the first version was incorrect, and has been replaced by Lemma 2.12. Several proofs ha

Scientific paper

Let G be a reductive p-adic group, H(G) its Hecke algebra and S(G) its Schwartz algebra. We will show that these algebras have the same periodic cyclic homology. This might be used to provide an alternative proof of the Baum-Connes conjecture for G, modulo torsion. As preparation for our main theorem we prove two results that have independent interest. Firstly a general comparison theorem for the periodic cyclic homology of finite type algebras and certain Fr\'echet completions thereof. Secondly a refined form of the Langlands classification for G, which clarifies the relation between the smooth spectrum and the tempered spectrum.

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