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arXiv 0903.4865math.AT
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检测BF_4在素数3处上同调的模不变量

Modular invariants detecting the cohomology of BF_4 at the prime 3

Carles Broto

摘要:

J.F. Adams猜想:在奇素数处,连通紧李群的分类空间的mod-p上同调环可由它的初等交换p-子群检测.本文利用户田对H^*(BF_4;F_3)的计算,证明了该猜想在特殊李群F_4的情况下成立。为此目的,我们利用不变量理论,以确定部分的H^*(BF_4;F_3)的不变子环的上同调的基本交换3-子群的F_4。这些子群本身可以通过Steenrod代数在H^*(BF_4;F_3)上的作用来确定。

英文摘要:

Attributed to J F Adams is the conjecture that, at odd primes, the mod-p cohomology ring of the classifying space of a connected compact Lie group is detected by its elementary abelian p-subgroups. In this note we rely on Toda's calculation of H^*(BF_4;F_3) in order to show that the conjecture holds in case of the exceptional Lie group F_4. To this aim we use invariant theory in order to identify parts of H^*(BF_4;F_3) with invariant subrings in the cohomology of elementary abelian 3-subgroups of F_4. These subgroups themselves are identified via the Steenrod algebra action on H^*(BF_4;F_3).

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