The paper constructs Specht filtrations of permutation modules for hook partitions in affine type A, for two-row partitions in type A-infinity, and generalized Specht filtrations with Specht resolutions for arbitrary partitions in type A-infinity.
Full runner removal theorem for Ariki-Koike algebras
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abstract
We consider the representation theory of the Ariki-Koike algebra, a $q$-deformation of the group algebra of the complex reflection group $C_r \wr S_n$. We define the addition of a runner full of beads for the abacus display of a multipartition and investigate some combinatorial properties of this operation. We focus our attention on the $q$-decomposition numbers, i.e. the polynomials arising from the Fock space representation of the quantum group $U_q(\widehat{\mathfrak{sl}}_e)$. Using Fayers' LLT-type algorithm for Ariki-Koike algebras, we relate $q$-decomposition numbers for different values of $e$ for the class of $e$-multiregular multipartitions, by adding a full runner of beads to each component of the abacus displays for the labelling multipartitions.
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A Specht Filtration of Permutation Modules Over KLR Algebras
The paper constructs Specht filtrations of permutation modules for hook partitions in affine type A, for two-row partitions in type A-infinity, and generalized Specht filtrations with Specht resolutions for arbitrary partitions in type A-infinity.