Existence of the S-matrix in quantum field theory in curved space-time |
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Authors: | Robert M. Wald |
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Affiliation: | Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637 USA |
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Abstract: | The existence of the S-matrix is proven for particle creation by an external gravitational field of compact support. No infrared divergences occur even for massless quantum fields; in particular, a localized gravitational field always produces a finite expected total number of particles. The results of this paper apply to both boson and fermion fields as well as to more general linear, external potential interactions. |
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