K-theory cohomology of associative algebra twisted bundles

Abstract

We introduce and study a $K$-theory of twisted bundles for associative algebras $A(\mathfrak{g})$ of formal series with an infinite-Lie algebra coefficients over arbitrary compact topological spaces. Fibers of such bundles are given by elements of algebraic completion of the space of all formal series in complex parameters, sections are provided by rational functions with prescribed analytic properties. In this paper we introduce and study K-groups $K(A(\mathfrak{g}),X)$ of twisted $A(\mathfrak{g})$-bundles as equivalence classes $[\mathcal{E}]$ of $A(\mathfrak{g})$-bundle $\mathcal{E}$. We show that for any twisted $A(\mathfrak{g})$-bundle $\mathcal{E}$ there exist another bundle $\tilde{\mathcal{E}}$ such that an element of $K(A(\mathfrak{g}),X)$ for $\mathcal{E}$ can be represented in the form $[\mathcal{E}]/[\tilde{\mathcal{E}}]$. The group $K(A(\mathfrak{g}),X)$ homomorphism properties with respect to tensor product, and splitting properties with respect to reductions of $X$ into base points. We determine also cohomology of cells of K-groups for the factor $X/Y$ of two compact spaces $X$ and $Y$.