The invertible double of elliptic operators

Details The invertible double of elliptic operators The invertible double of elliptic operators

2008-03-28

arxiv.org/abs/0803.4047v4

Lett. Math. Phys. 87 (2009), No 1-2, 19-46

Mathematics

Differential Geometry

25 pages, 1 figure, Final Version from Dec 30, 2008. To appear in Letters in Mathematical Physics

Scientific paper

10.1007/s11005-009-0292-9

First, we review the Dirac operator folklore about basic analytic and geometrical properties of operators of Dirac type on compact manifolds with smooth boundary and on closed partitioned manifolds and show how these properties depend on the construction of a canonical invertible double and are related to the concept of the Calderon projection. Then we summarize a recent construction of a canonical invertible double for general first order elliptic differential operators over smooth compact manifolds with boundary. We derive a natural formula for the Calderon projection which yields a generalization of the famous Cobordism Theorem. We provide a list of assumptions to obtain a continuous variation of the Calderon projection under smooth variation of the coefficients. That yields various new spectral flow theorems. Finally, we sketch a research program for confining, respectively closing, the last re- maining gaps between the geometric Dirac operator type situation and the general linear elliptic case.

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