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arXiv 0704.0583math.OAmath.KT
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关于强自吸收C* 代数的KK-理论

On the KK-theory of strongly self-absorbing C*-algebras

Marius Dadarlat, Wilhelm Winter

摘要:

设$\Dh$和$A$是酉可分的$C^{*}$ -代数,$\Dh$是强自吸收的.已知从$\Dh$到$A \otimes \Dh$的任何两个有单位的$^*$ -同态是近似酉等价的.我们表明,如果$\Dh$也是$K_{1}$ -内射,他们甚至是渐近酉等价的。这特别意味着$\Dh$的任何单位自同态都是渐近内的。此外,$\Dh$的自同构空间是紧可收缩的(在点范数拓扑中),在这个意义上,对于任何紧Hausdorff空间$X$,同伦类的集合$[X,\Aut(\Dh)]$约化为一个点。相应的陈述适用于$\Dh$的酉自同态空间。作为应用,我们用$^*$ -同态和渐近酉等价刻画了Kasparov群$KK(\Dh, A\ot \Dh)$.一路上,我们证明了卡斯帕罗夫群$KK(\Dh, A\ot \Dh)$同构于$K_0(A\ot \Dh)$。

英文摘要:

Let $\Dh$ and $A$ be unital and separable $C^{*}$-algebras; let $\Dh$ be strongly self-absorbing. It is known that any two unital $^*$-homomorphisms from $\Dh$ to $A \otimes \Dh$ are approximately unitarily equivalent. We show that, if $\Dh$ is also $K_{1}$-injective, they are even asymptotically unitarily equivalent. This in particular implies that any unital endomorphism of $\Dh$ is asymptotically inner. Moreover, the space of automorphisms of $\Dh$ is compactly-contractible (in the point-norm topology) in the sense that for any compact Hausdorff space $X$, the set of homotopy classes $[X,\Aut(\Dh)]$ reduces to a point. The respective statement holds for the space of unital endomorphisms of $\Dh$. As an application, we give a description of the Kasparov group $KK(\Dh, A\ot \Dh)$ in terms of $^*$-homomorphisms and asymptotic unitary equivalence. Along the way, we show that the Kasparov group $KK(\Dh, A\ot \Dh)$ is isomorphic to $K_0(A\ot \Dh)$.

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