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arXiv 1502.00494math.DG
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一致伪微分算子的指标理论

Index theory of uniform pseudodifferential operators

Alexander Engel

摘要:

本文将顺从流形上分次广义Dirac算子的Roe指标定理推广到多分次椭圆一致伪微分算子。这一推广将遵循作为一个推论,从一个局部指标定理,是有效的任何流形上的有界几何。这个本地公式采用了一致的估计,目前在我们的类pseudodiomatic算子的定义,这是更普遍的比其他作者定义的类似类。我们将重新回顾Spakula的一致K-同调,并证明多阶椭圆一致伪微分算子自然地在其中定义类。为此,我们将更仔细地研究一致K-同调,例如,构造外积并证明其在弱同伦下的不变性。后者将被用来完善和扩展Spakula的结果粗糙Baum-Connes装配图。我们将确定一致K-同调的对偶理论。我们将给出所有度量空间的一致K-理论的简单定义,在有界几何流形的情况下,我们将通过有界几何的向量丛给出它的解释。使用一个版本的Mayer-Vietoris归纳法,这是适应我们的需要,我们将证明Poincare对偶一致K-理论和一致K-同调有界几何的spin-c流形。我们将构造从一致K-理论到有界de Rham上同调和从一致K-同调到一致de Rham同调的Chern特征标。使用适应迈耶-Vietoris归纳,我们也将表明,这些陈省身字符诱导同构模扭转。

英文摘要:

We generalize Roe's index theorem for graded generalized Dirac operators on amenable manifolds to multigraded elliptic uniform pseudodifferential operators. This generalization will follow as a corollary from a local index theorem that is valid on any manifold of bounded geometry. This local formula incorporates the uniform estimates that are present in the definition of our class of pseudodifferential operators which is more general than similar classes defined by other authors. We will revisit Spakula's uniform K-homology and show that multigraded elliptic uniform pseudodifferential operators naturally define classes in it. For this we will investigate uniform K-homology more closely, e.g., construct the external product and show invariance under weak homotopies. The latter will be used to refine and extend Spakula's results about the rough Baum-Connes assembly map. We will identify the dual theory of uniform K-homology. We will give a simple definition of uniform K-theory for all metric spaces and in the case of manifolds of bounded geometry we will give an interpretation of it via vector bundles of bounded geometry. Using a version of Mayer-Vietoris induction that is adapted to our needs, we will prove Poincare duality between uniform K-theory and uniform K-homology for spin-c manifolds of bounded geometry. We will construct Chern characters from uniform K-theory to bounded de Rham cohomology and from uniform K-homology to uniform de Rham homology. Using the adapted Mayer-Vietoris induction we will also show that these Chern characters induce isomorphisms modulo torsion.

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