Spacetimes with an asymptotically stationary future and past possess a distinguished Feynman propagator, a central ingredient of the evaluation of scattering amplitudes. I will describe its construction and the related question of self-adjointness of the Klein-Gordon operator.
This talk is part of series of talks affiliated with the virtual Mittag-Leffler workshop "Scattering, microlocal analysis and renormalization", organized by Claudio Dappiaggi, Jacob Schach Møller and Michal Wrochna. The full schedule can be found at:
