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On Iwahori-Whittaker Functions for Metaplectic Groups (1509.01594v2)
Published 4 Sep 2015 in math.RT and math.NT
Abstract: We relate Iwahori-Whittaker functions on metaplectic covers to certain Demazure-Lusztig operators, the latter of which are built from a Weyl group action previously considered by G. Chinta and P. Gunnells. Using a certain combinatorial identity for the sum of these Demazure-Lusztig operators, we obtain an analogue of the Casselman-Shalika formula for spherical Whittaker functions in this context.
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