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arXiv 1011.0652math.AGmath.KT
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辛代数配边与Hermitian K-理论的关系

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

Ivan Panin, Charles Walter

摘要:

我们重建埃尔米特K-理论通过代数辛配边。在运动稳定同伦范畴SH(S)中,存在交换环T-谱的唯一态射g:MSp -> BO,它将Thom类th^{MSp}变换为Thom类th^{BO}.证明了双分次上同调理论MSp^{*,*} -> BO^{*,*}的诱导态射同构于对MSp^{*,*}应用“(单分次)系数环的变换”MSp^{4*,2 *} -> BO^{4*,2 *}得到的双分次上同调理论的态射.这是Conner和Floyd通过辛配边重构实K-理论定理的代数版本。

英文摘要:

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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