# Local index theory for Lorentzian manifolds

#### 28.07.2022, 16:15  –  Raum 0.14 Forschungsseminar Differentialgeometrie

Christian Bär

We prove a local version of the index theorem for Dirac-type operators on globally hyperbolic Lorentzian manifolds with Cauchy boundary. In case the Cauchy hypersurface is compact, we do not assume self-adjointness of the Dirac operator on the spacetime or of the associated elliptic Dirac operator on the boundary.
In this case, integration of our local index theorem results in a generalization of previously known index theorems for globally hyperbolic spacetimes that allows for twisting bundles associated with non-compact gauge groups.
This is joint work with Alexander Strohmaier (Leeds).

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