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Article Dans Une Revue Advances in Mathematics Année : 2021

ATOMIC DECOMPOSITION OF CHARACTERS AND CRYSTALS

Résumé

Lascoux stated that the type A Kostka-Foulkes polynomials K λ,µ (t) expand positively in terms of so-called atomic polynomials. For any semisimple Lie algebra, the former polynomial is a t-analogue of the multiplicity of the dominant weight µ in the irreducible representation of highest weight λ. We formulate the atomic decomposition in arbitrary type, and view it as a strengthening of the monotonicity of K λ,µ (t). We also define a combinatorial version of the atomic decomposition, as a decomposition of a modified crystal graph. We prove that this stronger version holds in type A (which provides a new, conceptual approach to Lascoux's statement), in types C and D in a stable range for t = 1, as well as in some other cases, while we conjecture that it holds more generally. Another conjecture stemming from our work leads to an efficient computation of K λ,µ (t). We also give a geometric interpretation.
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Dates et versions

hal-01862912 , version 1 (28-08-2018)

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Cédric Lecouvey, Cristian Lenart. ATOMIC DECOMPOSITION OF CHARACTERS AND CRYSTALS. Advances in Mathematics, 2021, 376, pp.107453. ⟨10.1016/j.aim.2020.107453⟩. ⟨hal-01862912⟩
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