On Clifford theory with Galois action

preprint2016arXivOpen access

Abstract

Let G^\widehat{G} be a finite group, NN a normal subgroup of G^\widehat{G} and θ∈Irr⁡Nθ\in \operatorname{Irr}N. Let F\mathbb{F} be a subfield of the complex numbers and assume that the Galois orbit of θθ over F\mathbb{F} is invariant in G^\widehat{G}. We show that there is another triple (G^1,N1,θ1)(\widehat{G}_1,N_1,θ_1) of the same form, such that the character theories of G^\widehat{G} over θθ and of G^1\widehat{G}_1 over θ1θ_1 are essentially "the same" over the field F\mathbb{F} and such that the following holds: G^1\widehat{G}_1 has a cyclic normal subgroup CC contained in N1N_1, such that θ1=λN1θ_1=λ^{N_1} for some linear character λλ of CC, and such that N1/CN_1/C is isomorphic to the (abelian) Galois group of the field extension F(λ)/F(θ1)\mathbb{F}(λ)/\mathbb{F}(θ_1). More precisely, "the same" means that both triples yield the same element of the Brauer-Clifford group BrCliff⁡(G,F(θ))\operatorname{BrCliff}(G,\mathbb{F}(θ)) defined by A. Turull.

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