-
Anne Schilling
-
Peter Tingley
Keywords:
crystal bases
Abstract
It has previously been shown that, at least for non-exceptional Kac-Moody Lie algebras, there is a close connection between Demazure crystals and tensor products of Kirillov-Reshetikhin crystals. In particular, certain Demazure crystals are isomorphic as classical crystals to tensor products of Kirillov-Reshetikhin crystals via a canonically chosen isomorphism. Here we show that this isomorphism intertwines the natural affine grading on Demazure crystals with a combinatorially defined energy function. As a consequence, we obtain a formula of the Demazure character in terms of the energy function, which has applications to Macdonald polynomials and $q$-deformed Whittaker functions.
Author Biographies
Anne Schilling, University of California at Davis
Professor, Department of Mathematics, UC Davis
Peter Tingley, Postdoc, M.I.T.
Faculty, Loyola, Chicago
Faculty, Loyola