Generalized etale cohomology
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General Introduction
A generalized etale cohomology theory, according to Jardine, is a cohomology theory which is represented by a presheaf of spectra on some étale site. Examples: etale K-theory, etale cohomology.
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Search results
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Online References
It is not clear to me what the relation is between Jardine's concept and the theories represented by objects in Quick's stable homotopy category.
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Paper References
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Definition
We follow chapter 6 of Jardine: Generalized etale cohomology theories.
A gen. etale cohomology theory is a graded group
, which is associated to a presheaf of spectra
on an etale site for a scheme
. It arises from the homotopy category of presheaves of spectra on the underlying site for
. If
consists of presheaves of Kan complexes, then
is a graded group consisting of morphisms in the associated stable category in the sense that
where
is the constant presheaf associated to the ordinary sphere spectrum
.
Formal definition of
in terms of stable homotopy groups of global sections for a globally fibrant model of
.
Construction of the etale cohomological descent spectral sequence:
under some hyps. (Use Postnikov resolutions)
Finite approximation technique for computing the groups
Special case:
is a field. In this the case the category of sheaves on the etale site of
can be identified with the classifying topos of the absolute Galois group of
. More on generalized Galois cohomology theories.
Discussion of Cech cohomology.
Chapter 7: We give proof of Thomason's descent theorem for the Bott periodic K-theory of fields and its corollaries. Outline due to Thomason, but we use homotopy theory of presheaves of spectra (smash products) and the Gabber rigidity theorem.
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Properties
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Standard theorems
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Open Problems
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Connections to Number Theory
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Computations and Examples
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History and Applications
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Some Research Articles
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Other Information
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