On the Bott periodicity, $J$-homomorphisms, transfer maps and $H_*Q_0S^{-n}$

Details On the Bott periodicity, $J$-homomorphisms, transfer maps and $H_*Q_0S^{-n}$ On the Bott periodicity, $J$-homomorphisms, transfer maps and $H_*Q_0S^{-n}$

2009-11-23

arxiv.org/abs/0911.4478v3

Mathematics

Algebraic Topology

20 pages. Updated, with more details proofs

Scientific paper

The Curtis conjecture predicts that the only spherical classes in $H_*(Q_0S^0;\Z/2)$ are the Hopf invariant one and the Kervaire invariant one elements. We consider Sullivan's decomposition $$Q_0S^0=J\times\cok J$$ where $J$ is the fibre of $\psi^q-1$ ($q=3$ at the prime $2$) and observe that the Curtis conjecture holds when we restrict to $J$. We then use the Bott periodicity and the $J$-homomorphism $SO\to Q_0S^0$ to define some generators in $H_*(Q_0S^0;\Z/p)$, when $p$ is any prime, and determine the type of subalgebras that they generate. For $p=2$ we determine spherical classes in $H_*(\Omega^k_0J;\Z/2)$. We determine truncated subalgebras inside $H_*(Q_0S^{-k};\Z/2)$. Applying the machinery of the Eilenberg-Moore spectral sequence we define classes that are not in the image of by the $J$-homomorphism. We shall make some partial observations on the algebraic structure of $H_*(\Omega^k_0\cok J;\Z/2)$. Finally, we shall make some comments on the problem in the case equivariant $J$-homomorphisms.

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