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arXiv · 1903.01580

Morita equivalences for cyclotomic Hecke algebras of type B and D

Loïc Poulain d'Andecy·Salim Rostam
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Abstract

We give a Morita equivalence theorem for so-called cyclotomic quotients of affine Hecke algebras of type B and D, in the spirit of a classical result of Dipper-Mathas in type A for Ariki-Koike algebras. As a consequence, the representation theory of affine Hecke algebras of type B and D reduces to the study of their cyclotomic quotients with eigenvalues in a single orbit under multiplication by $q^2$ and inversion. The main step in the proof consists in a decomposition theorem for generalisations of quiver Hecke algebras that appeared recently in the study of affine Hecke algebras of type B and D. This theorem reduces the general situation of a disconnected quiver with involution to a simpler setting. To be able to treat types B and D at the same time we unify the different definitions of generalisations of quiver Hecke algebra for type B that exist in the literature.

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Loïc Poulain d'Andecy, Salim Rostam. 2020-11-30. Morita equivalences for cyclotomic Hecke algebras of type B and D. https://doi.org/10.24033/bsmf.2828

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