Crystal bases and combinatorics of infinite rank quantum groups

Details Crystal bases and combinatorics of infinite rank quantum groups Crystal bases and combinatorics of infinite rank quantum groups

2006-04-28

arxiv.org/abs/math/0604636v1

Mathematics

Combinatorics

Scientific paper

The tensor powers of the vector representation associated to an infinite rank quantum group decompose into irreducible components with multiplicities independant of the infinite root system considered. Although the irreducible modules obtained in this way are not of highest weight, they admit a crystal basis and a canonical basis. This permits in particular to obtain for each familly of classical Lie algebras a Robinson-Schensted correspondence on biwords defined on infinite alphabets. We then depict a structure of bi-crystal on these bi-words. This RS-correspondence yields also a plactic algebra and plactic Schur functions distinct for each infinite root system. Surprisingly, the algebras spanned by these plactic Schur functions are all isomorphic to the algebra of symmetric functions.

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