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arXiv math/0006108math.DGmath.AT
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Novikov-Shubin签名,II

Novikov - Shubin signatures, II

Michael Farber

摘要:

本文继续数学. DG/9903140.本文构造了奇维流形的中维推广L^2同调和上同调的挠部分的一个连接形式。给出了该联结形式为双曲型时的一个几何必要条件。我们计算这种连接形式的情况下,当流形的边界。我们引入和研究了新的数字不变量的链接形式:Novikov-Shubin签名和扭转签名。我们计算这些不变量显式的流形与$π_1 = Z$的Blanchfield形式。我们开发了一个概念,多余的扭模的扩展,并展示了如何使用这个概念来保证消失的扭转签名。

英文摘要:

This paper continues math.DG/9903140. Here we construct a linking form on the torsion part of middle dimensional extended L^2 homology and cohomology of odd-dimensional manifolds. We give a geometric necessary condition when this linking form is hyperbolic. We compute this linking form in case when the manifold bounds. We introduce and study new numerical invariants of the linking form: the Novikov - Shubin signature and the torsion signature. We compute these invariants explicitly for manifolds with $π_1 = Z$ in terms of the Blanchfield form. We develop a notion of excess for extensions of torsion modules and show how this concept can be used to guarantee vanishing of the torsion signature.

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