Equivariant Semi-topological Invariants, Atiyah's KR-theory, and Real Algebraic Cycles

Details Equivariant Semi-topological Invariants, Atiyah's KR-theory, and Real Algebraic Cycles Equivariant Semi-topological Invariants, Atiyah's KR-theory, and Real Algebraic Cycles

2010-08-22

arxiv.org/abs/1008.3685v1

Mathematics

Algebraic Geometry

39 pages

Scientific paper

We establish an Atiyah-Hirzebruch type spectral sequence relating real morphic cohomology and real semi-topological K-theory and prove it to be compatible with the Atiyah-Hirzebruch spectral sequence relating Bredon cohomology and Atiyah's KR-theory constructed by Dugger. An equivariant and a real version of Suslin's conjecture on morphic cohomology are formulated, proved to come from the complex version of Suslin conjecture and verified for certain real varieties. In conjunction with the spectral sequences constructed here this allows the computation of the real semi-topological K-theory of some real varieties. As another application of this spectral sequence we give an alternate proof of the Lichtenbaum-Quillen conjecture over $\R$, extending an earlier proof of Karoubi and Weibel.

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