On index formulas for manifolds with metric horns

Details On index formulas for manifolds with metric horns On index formulas for manifolds with metric horns

1996-09-24

arxiv.org/abs/dg-ga/9609009v2

Commun. Part. Diff. Equ. 23 (1998), 649-684

Mathematics

Differential Geometry

LaTeX, 37 pages. Final version from 20 Jan 1998, completely revised

Scientific paper

In this paper we discuss the index problem for geometric differential operators (Spin-Dirac operator, Gau{\ss}-Bonnet operator, Signature operator) on manifolds with metric horns. On singular manifolds these operators in general do not have unique closed extensions. But there always exist two extremal extensions $D_{min}$ and $D_{max}$. We describe the quotient ${\cal D}(D_{max}) / {\cal D}(D_{min})$ explicitely in geometric resp. topologic terms of the base manifolds of the metric horns. We derive index formulas for the Spin-Dirac and Gau{\ss}-Bonnet operator. For the Signature operator we present a partial result. The first version of this paper was completed August 1995 at the University of Augsburg.

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