For massive Klein-Gordon operators with asymptotically static potentials on asymptotically Minkowski spacetimes, the authors construct a unique Feynman propagator and prove a microlocal Hadamard wavefront condition.
Gell-Redman, N
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The Klein-Gordon equation on asymptotically Minkowski spacetimes: the Feynman propagator
For massive Klein-Gordon operators with asymptotically static potentials on asymptotically Minkowski spacetimes, the authors construct a unique Feynman propagator and prove a microlocal Hadamard wavefront condition.