Eta Invariant and Conformal Cobordism

Details Eta Invariant and Conformal Cobordism Eta Invariant and Conformal Cobordism

2001-06-20

arxiv.org/abs/math/0106172v2

Mathematics

Differential Geometry

Scientific paper

In this note we study the problem of conformally flat structures bounding conformally flat structures and show that the eta invariants give obstructions. These lead us to the definition of an abelian group, the conformal cobordism group, which classifies the conformally flat structures according to whether they bound (higher dimensional) conformally flat structures in a conformally invariant way. The eta invariant gives rise to a homomorphism from this group to the circle group, which can be highly nontrivial. It remains an interesting question of how to compute this group.

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