Some examples of Hecke algebras over 2-dimensional local fields

Details Some examples of Hecke algebras over 2-dimensional local fields Some examples of Hecke algebras over 2-dimensional local fields

2005-10-25

arxiv.org/abs/math/0510538v2

Mathematics

Representation Theory

Dedicated to G.Lusztig on the occasion of his 60th birthday

Scientific paper

Let K be a local non-archimedian field, F=K((t)) and let G be a split semi-simple group. The purpose of this paper is to study certain analogs of spherical (and Iwahori) Hecke algebras for representations of the group G(F) and its central extension by means of K*. For instance our spherical Hecke algebra corresponds to the subgroup G(A) where A is the subring $\calO_K((t))$ where $\calO_K\subset K$ is the ring of integers. It turns out that for generic level the spherical Hecke algebra is trivial; however, on the critical level it is quite large. On the other hand we expect that the size of the corresponding Iwahori-Hecke algebra does not depend on a choice of a level (details will be considered in another publication).

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