On the relation of symplectic algebraic cobordism to hermitian K-theory

Details On the relation of symplectic algebraic cobordism to hermitian K-theory On the relation of symplectic algebraic cobordism to hermitian K-theory

2010-11-02

arxiv.org/abs/1011.0652v1

Mathematics

Algebraic Geometry

Scientific paper

We reconstruct hermitian K-theory via algebraic symplectic cobordism. In the motivic stable homotopy category SH(S) there is a unique morphism g : MSp -> BO of commutative ring T- spectra which sends the Thom class th^{MSp} to the Thom class th^{BO}. We show that the induced morphism of bigraded cohomology theories MSp^{*,*} -> BO^{*,*} is isomorphic to the morphism of bigraded cohomology theories obtained by applying to MSp^{*,*} the "change of (simply graded) coefficients rings" MSp^{4*,2*} -> BO^{4*,2*}. This is an algebraic version of the theorem of Conner and Floyd reconstructing real K-theory via symplectic cobordism.

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