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Chromatic characteristic classes in ordinary group cohomology, Topology 42 (2003)

by D J Green, J R Hunton, B Schuster
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Subalgebras of group cohomology defined by infinite loop spaces

by John Robert Hunton, Björn Schuster , 2001
"... We study natural subalgebras ChE(G) of group cohomology defined in terms of infinite loop spaces E and give representation theoretic descriptions of those based on QS 0 and the Johnson-Wilson theories E(n). We describe the subalgebras arising from the Brown-Peterson spectra BP and as a result give a ..."
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We study natural subalgebras ChE(G) of group cohomology defined in terms of infinite loop spaces E and give representation theoretic descriptions of those based on QS 0 and the Johnson-Wilson theories E(n). We describe the subalgebras arising from the Brown-Peterson spectra BP and as a result give a simple reproof of Yagita’s theorem that the image of BP ∗ (BG) in H ∗ (BG; Fp) is F-isomorphic to the whole cohomology ring; the same result is shown to hold with BP replaced by any complex oriented theory E with a map of ring spectra E → HFp which is non-trivial in homotopy. We also extend the constructions to define subalgebras of H ∗ (X; Fp) for any space X; when X is finite we show that the subalgebras Ch E(n)(X) give a natural unstable chromatic filtration of H ∗ (X; Fp). 1
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...s f : W → V with the property that if U is any subgroup of W of rank at most n, the restriction of f to U is given by conjugation by some element of G. Corollary 5.6, together with the main result of =-=[12]-=-, now gives Theorem 5.7 For a finite group G there is a homeomorphism of varieties □ var(Ch E(n)(G)) ∼ = colim V ∈A (n) var(H (G) ∗ (V )). □ We can now also explain the relationship between Ch E(1)(X)...

Subrings

by Geoffrey M
"... pagination and layout may vary from AGT published version ..."
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pagination and layout may vary from AGT published version
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...tic filtration of stable homotopy theory and a stratification of the algebraic variety associated to the cohomology of a finite group which was made explicit by the work of Green, Hunton and Schuster =-=[4]-=-. The purpose of this paper is to investigate generalizations of this theory, by exploiting the theory of unstable algebras over the Steenrod algebra for singular cohomology with coefficients in a pri...

HKR

by Jack Morava , 2004
"... characters and higher twisted sectors ..."
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characters and higher twisted sectors
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.... [In some sense the chromatic filtration and the AtiyahSwan filtration of ordinary cohomology by size of supporting elementary abelian subgroups are aspects of some common underlying phenomenon; see =-=[5,6]-=- for recent work on the latter topic.] The advantage of cobordism lies in its naturality: its cycles are geometric objects, which carry characteristic class data (for example, of the sort familiar to ...

Subrings

by Geoffrey M L Powell
"... of singular cohomology associated to spectra ..."
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of singular cohomology associated to spectra
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...tic filtration of stable homotopy theory and a stratification of the algebraic variety associated to the cohomology of a finite group which was made explicit by the work of Green, Hunton and Schuster =-=[4]-=-. The purpose of this paper is to investigate generalizations of this theory, by exploiting the theory of unstable algebras over the Steenrod algebra for singular cohomology with coefficients in a pri...

Subrings

by Geoffrey M L Powell
"... of singular cohomology associated to spectra ..."
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of singular cohomology associated to spectra
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...tic filtration of stable homotopy theory and a stratification of the algebraic variety associated to the cohomology of a finite group which was made explicit by the work of Green, Hunton and Schuster =-=[4]-=-. The purpose of this paper is to investigate generalizations of this theory, by exploiting the theory of unstable algebras over the Steenrod algebra for singular cohomology with coefficients in a pri...

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