Generalised canonical basic sets for Ariki-Koike algebras

Thomas Gerber (1)

1 LMPT - Laboratoire de Mathématiques et Physique Théorique

Let H be a non semi-simple Ariki-Koike algebra. According to [18] and [14], there is a generalisation of Lusztig's a-function which induces a natural order (parametrised by a tuple m) on Specht modules. In some cases, Geck and Jacon have proved that this order makes unitriangular the decomposition matrix of H. The algebra H is then said to admit a "canonical basic set". We fully classify which values of m afford a canonical basic set for H and which do not. When this is the case, we describe these sets in terms of "twisted Uglov" or "twisted Kleshchev" multipartitions.

Mots clés: modular representation theory; Ariki-Koike algebra; cyclotomic Hecke algebra; decomposition matrix; canonical basic set

Domaines: Théorie des représentations [math.RT]

Thomas Gerber. Generalised canonical basic sets for Ariki-Koike algebras. 2013. ⟨hal-00803625v2⟩