Navarro conjecture for finite groups

Let GG be a finite group, let pp be a prime dividing G|G|, let DD be a Sylow pp-subgroup of GG, and let NG(D)N_G(D) be the normalizer of DD in GG. Let Irr(G)\operatorname{Irr}(G) denote the irreducible characters of GG, and let Irrp(G)\operatorname{Irr}_{p'}(G) and Irrp(NG(D))\operatorname{Irr}_{p'}(N_G(D)) be the characters of degree relatively prime to pp in the respective groups. Let n=Gn=|G|, let G=Gal(Qn/Q)\mathcal{G}=\operatorname{Gal}(\mathbb{Q}_n/\mathbb{Q}), and let N\mathcal{N} consist of the automorphisms σeG\sigma_e\in\mathcal{G}, for nonnegative integers ee, satisfying σe(ξ)=ξpe\sigma_e(\xi)=\xi^{p^e} for every pp'-root of unity ξ\xi. For σN\sigma\in\mathcal{N}, write Irrpσ(G)\operatorname{Irr}^{\sigma}_{p'}(G) and Irrpσ(NG(D))\operatorname{Irr}^{\sigma}_{p'}(N_G(D)) for the subsets fixed by σ\sigma. Navarro conjecture. For every σN\sigma\in\mathcal{N},

Irrpσ(G)=Irrpσ(NG(D)).|\operatorname{Irr}^{\sigma}_{p'}(G)|=|\operatorname{Irr}^{\sigma}_{p'}(N_G(D))|.

This is Navarro's Galois-equivariant refinement of the McKay conjecture. The source calls the underlying McKay conjecture unsolved; it does not provide a resolution of this general Navarro statement, although it proves the relevant assertion for the stated alternating-group setting.

Sources & referencesView supporting material

Primary source

Rishi Nath, “A note on the Navarro conjecture for alternating groups with abelian defect”, arXiv:0906.1820 (2010).

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