We make explicit a triple crystal structure on higher level Fock spaces, by investigating at the combinatorial level the actions of two affine quantum groups and of a Heisenberg algebra. To this end, we first determine a new indexation of the basis elements that makes the two quantum group crystals commute. Then, we define a so-called Heisenberg crystal, commuting with the other two. This gives new information about the representation theory of cyclotomic rational Cherednik algebras, relying on some recent results of Shan and Vasserot and of Losev. In particular, we give an explicit labelling of their finite-dimensional simple modules.
- Pub Date:
- January 2016
- Mathematics - Representation Theory;
- Mathematics - Combinatorics;
- Version 2: Proof of Lemma 5.5 improved, Section 6 simplified and additional minor changes. Version 3: Section 4 rewritten (including simpler proof of Lemma 4.7 and Theorem 4.8), Theorem 6.26 replaced by Corollary 6.25, notation for "level-rank" dual objects modified, Section 7.1 slightly rewritten