Geometric fixed points of relative norms for normal subgroups

From papers

Let GG be a compact Lie group, let H<GH<G be a closed subgroup, let KGK\trianglelefteq G be normal, and let XX be an HH-equivariant DV\mathcal{D}_V-algebra satisfying the paper's Cofibrancy Hypothesis. If HH has finite index in HKHK, then HKH\cap K acts trivially on VV, the map of HH-equivariant inner product spaces

V=TeHG/HTeHKG/HKV=T_{eH}G/H\longrightarrow T_{eHK}G/HK

is an isomorphism, and there is a natural UKU^K-universe G/KG/K-equivariant weak equivalence

(NHGX)ΦKN(G/K)/(HK/K)G/K(XΦ(HK)).(N_H^G X)^{\Phi K}\simeq N_{(G/K)/(HK/K)}^{G/K}(X^{\Phi(H\cap K)}).

If HH is not finite index in HKHK, the unit map instead induces a UKU^K-universe G/KG/K-equivariant weak equivalence S(NHGX)ΦK\mathbb{S}\longrightarrow (N_H^G X)^{\Phi K}. This conjecture describes geometric fixed points of relative norms in the normal-subgroup cases.

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Sources & referencesView supporting material

Primary source

Andrew J. Blumberg, Michael A. Hill and Michael A. Mandell, “Norms for compact Lie groups in equivariant stable homotopy theory”, arXiv:2212.11404 (2022).

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