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Quantum fields propagating on a curved spacetime are investigated in terms ofmicrolocal analysis. We discuss a condition on the wave front set for thecorresponding n-point distributions, called ``microlocal spectrum condition''($\mu$SC). On Minkowski space, this condition is satisfied as a consequence ofthe usual spectrum condition. Based on Radzikowski's determination of the wavefront set of the two-point function of a free scalar field, satisfying theHadamard condition in the Kay and Wald sense, we construct in the second partof this paper all Wick polynomials including the energy-momentum tensor forthis field as operator valued distributions on the manifold and prove that theysatisfy our microlocal spectrum condition.Comment: 21 pages, AMS-LaTeX, 2 figures appended as Postscript file

The microlocal spectrum condition and Wick polynomials of free fields on curved spacetimes