Abstract
Cobordism invariance shows that the index, in K-theory, of a family of pseudodifferential operators on the boundary of a fibration vanishes if the symbol family extends to be elliptic across the whole fibration. For Dirac operators with spectral boundary condition, Dai and Freed [5] gave an explicit version of this at the level of the determinant bundle. Their result, that the eta invariant of the interior family trivializes the determinant bundle of the boundary family, is extended here to the wider context of pseudodifferential families of cusp type.
The first author acknowledges the support of the National Science Foundation under grant DMS0408993,the second author acknowledges support of the Fonds québécois sur la nature et les technologies and NSERC while part of this work was conducted.
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Melrose, R., Rochon, F. (2008). Boundaries, Eta Invariant and the Determinant Bundle. In: Burghelea, D., Melrose, R., Mishchenko, A.S., Troitsky, E.V. (eds) C*-algebras and Elliptic Theory II. Trends in Mathematics. Birkhäuser Basel. https://doi.org/10.1007/978-3-7643-8604-7_8
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