The Sobolev Wavefront Set of the Causal Propagator in Finite Regularity

Yafet Sanchez Sanchez, Elmar Schrohe

Given a globally hyperbolic spacetime $M=\mathbb{R}\times \hat{I}\pounds$ of dimension four and regularity $C^{\ddot{I}}„$, we estimate the Sobolev wavefront set of the causal propagator $K_G$ of the K…