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arXiv math/0001179math.KT
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关于循环同调的Cuntz-Quillen框架中的导出函子类比

On the derived functor analogy in the Cuntz-Quillen framework for cyclic homology

Guillermo Cortiñas

摘要:

Cuntz和Quillen证明了对于域$char(k)=0$上的代数,周期循环同调在某种意义上可以看作是(非交换)de Rham(余)同调的导出函子。本文的目的是形式化这个导出函子类比。我们证明了可数原代数范畴$\Cal{PA}$在(无穷小)形变类上的局部化${Def}^{-1}\Cal{PA}$存在(在任何特征中)(定理3.2),并且在特征零中,周期循环同调是de Rham上同调关于这个局部化的导出函子(推论5.4)。我们还计算了$\Bbb Q$上代数的有理$K$ -理论的导出函子,我们证明了它本质上是陈特征标到负循环同调的纤维(定理6.2)。

英文摘要:

Cuntz and Quillen have shown that for algebras over a field $k$ with $char(k)=0$, periodic cyclic homology may be regarded, in some sense, as the derived functor of (non-commutative) de Rham (co-)homology. The purpose of this paper is to formalize this derived functor analogy. We show that the localization ${Def}^{-1}\Cal{PA}$ of the category $\Cal{PA}$ of countable pro-algebras at the class of (infinitesimal) deformations exists (in any characteristic) (Theorem 3.2) and that, in characteristic zero, periodic cyclic homology is the derived functor of de Rham cohomology with respect to this localization (Corollary 5.4). We also compute the derived functor of rational $K$-theory for algebras over $\Bbb Q$, which we show is essentially the fiber of the Chern character to negative cyclic homology (Theorem 6.2).

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