Hadamard property of the in and out states for Klein-Gordon fields on   asymptotically static spacetimes
  We consider the massive Klein-Gordon equation on a class of asymptotically static spacetimes (in the long range sense) with Cauchy surface of bounded geometry. We prove the existence and Hadamard property of the in and out states constructed by scattering theory methods. 
Christian G\'erard, Micha{\l} Wrochna
math-ph hep-th math.AP math.MP