A local-global principle for unipotent characters

Abstract

We obtain an adaptation of Dade's Conjecture and Späth's Character Triple Conjecture to unipotent characters of simple, simply connected finite reductive groups of type $\mathbf{A}$, $\mathbf{B}$ and $\mathbf{C}$. In particular, this gives a precise formula for counting the number of unipotent characters of each defect $d$ in any Brauer $\ell$-block $B$ in terms of local invariants associated to $e$-local structures. This provides a geometric version of the local-global principle in representation theory of finite groups. A key ingredient in our proof is the construction of certain parametrisations of unipotent generalised Harish-Chandra series that are compatible with isomorphisms of character triples.

References in corpus (5)

• Degree divisibility in Alperin-McKay correspondences
• The Brown complex in non-defining characteristic and applications
• Inductive local-global conditions and generalized Harish-Chandra theory
• The Alperin Weight Conjecture and the Glauberman correspondence via character triples
• A reduction theorem for the Character Triple Conjecture

Cited by in corpus (1)

• The Alperin Weight Conjecture and the Glauberman correspondence via character triples