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arXiv 1401.7150math.AT
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有限离散G-谱与迭代同伦不动点

Profinite and discrete G-spectra and iterated homotopy fixed points

Daniel G. Davis, Gereon Quick

摘要:

对于一个profinite群$G$,令$(\text{-})^{hG}$,$(\text{-})^{h_dG}$和$(\text{-})^{h'G}$分别表示profinite $G$ -谱,离散$G$ -谱和连续$G$ -谱(来自离散$G$ -谱的塔)的连续同伦不动点.我们建立了前两个概念之间的联系,并利用Postnikov塔,对$K \vartriangleleft_c G$(闭正规子群)给出了迭代同伦不动点$(X^{hK})^{hG/K}$存在且为$X^{hG}$的各种条件.对于Lubin-Tate谱$E_n$和$G <_c G_n$,扩展的Morava稳定子群,我们的结果表明,$E_n^{hK}$是一个具有$(E_n^{hK})^{hG/K} \simeq E_n^{hG}$的profinite $G/K$ -谱,通过一个具有某种技术简单性的论证,该论证不被$(E_n^{h'K})^{h'G/K} \simeq E_n^{h'G}$或Devinatz-Hopkins证明所享有(需要$|G/K| < \infty$),其中$E_n^{dhK}$是一个行为类似连续同伦不动点的构造。此外,我们证明了(在一般情况下)的$G/K$同伦不动点谱序列的$π_\ast((E_n^{hK})^{hG/K})$,与$E_2^{s,t} = H^s_c(G/K; π_t(E_n^{hK}))$(连续上同调),是同构的强收敛的Lyndon-Hochschild-Serre谱序列的Devinatz的$π_\ast(E_n^{dhG})$,与$E_2^{s,t} = H^s_c(G/K; π_t(E_n^{dhK}))$,和下降谱序列的$π_\ast((E_n^{h'K})^{h'G/K})$。

英文摘要:

For a profinite group $G$, let $(\text{-})^{hG}$, $(\text{-})^{h_dG}$, and $(\text{-})^{h'G}$ denote continuous homotopy fixed points for profinite $G$-spectra, discrete $G$-spectra, and continuous $G$-spectra (coming from towers of discrete $G$-spectra), respectively. We establish some connections between the first two notions, and by using Postnikov towers, for $K \vartriangleleft_c G$ (a closed normal subgroup), give various conditions for when the iterated homotopy fixed points $(X^{hK})^{hG/K}$ exist and are $X^{hG}$. For the Lubin-Tate spectrum $E_n$ and $G <_c G_n$, the extended Morava stabilizer group, our results show that $E_n^{hK}$ is a profinite $G/K$-spectrum with $(E_n^{hK})^{hG/K} \simeq E_n^{hG}$, by an argument that possesses a certain technical simplicity not enjoyed by either the proof that $(E_n^{h'K})^{h'G/K} \simeq E_n^{h'G}$ or the Devinatz-Hopkins proof (which requires $|G/K| < \infty$) of $(E_n^{dhK})^{h_dG/K} \simeq E_n^{dhG}$, where $E_n^{dhK}$ is a construction that behaves like continuous homotopy fixed points. Also, we prove that (in general) the $G/K$-homotopy fixed point spectral sequence for $π_\ast((E_n^{hK})^{hG/K})$, with $E_2^{s,t} = H^s_c(G/K; π_t(E_n^{hK}))$ (continuous cohomology), is isomorphic to both the strongly convergent Lyndon-Hochschild-Serre spectral sequence of Devinatz for $π_\ast(E_n^{dhG})$, with $E_2^{s,t} = H^s_c(G/K; π_t(E_n^{dhK}))$, and the descent spectral sequence for $π_\ast((E_n^{h'K})^{h'G/K})$.

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