The Satake isomorphism for special maximal parahoric Hecke algebras

Details The Satake isomorphism for special maximal parahoric Hecke algebras The Satake isomorphism for special maximal parahoric Hecke algebras

2009-07-26

arxiv.org/abs/0907.4506v2

Mathematics

Representation Theory

20 pages, modified section 11, added section 12

Scientific paper

Let G denote a connected reductive group over a nonarchimedean local field F. Let K denote a special maximal parahoric subgroup of G(F). We establish a Satake isomorphism for the Hecke algebra H of K-bi-invariant compactly supported functions on G(F). The key ingredient is a Cartan decomposition describing the double coset space K\G(F)/K. We also describe how our results relate to the treatment of Cartier, where K is replaced by a special maximal compact open subgroup K' of G(F) and where a Satake isomorphism is established for the Hecke algebra of K'-bi-invariant compactly supported functions on G(F).

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