Introduces relative eta invariants for Dirac operators coinciding at infinity on non-compact manifolds with bounded curvature, yielding a spectral flow formula, a new proof of a Gromov-Lawson result, and an APS index theorem generalization to non-compact boundaries.
Getzler, The odd Chern character in cyclic homology and spectral flow , Topology 32 (1993), no
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Relative eta invariant and uniformly positive scalar curvature on non-compact manifolds
Introduces relative eta invariants for Dirac operators coinciding at infinity on non-compact manifolds with bounded curvature, yielding a spectral flow formula, a new proof of a Gromov-Lawson result, and an APS index theorem generalization to non-compact boundaries.