It is shown that the method of adiabatic regularization, proposed by Parker & Fulling for the removal of divergences in the vacuum expectation value of the stress tensor of a quantized field propagating in a Robertson-Walker background, is well suited to calculations of cosmological interest. After verifying the equivalence of the adiabatic and point-splitting regularization schemes, both analytical and numerical examples of the use of the former method are given.
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N. D. Birrell (1978) studied this question.
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