Abstract
The dimensional renormalization of scalar and spinor field theories quantized in a conformally flat ($k=0$) Robertson-Walker space-time is discussed. The theories considered are conformally invariant save explicit mass terms. All calculations are performed on the level of the canonical, Heisenberg-picture field theory, and explicit formulas derived for renormalized Heisenberg-state expectation values, such as particle production. Some solvable models are presented as illustrations of the formalism.
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